2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
5 * Copyright 2008 Luis R. Rodriguez <lrodriguz@atheros.com>
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.
13 * DOC: Wireless regulatory infrastructure
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.
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.
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.
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.
36 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
38 #include <linux/kernel.h>
39 #include <linux/slab.h>
40 #include <linux/list.h>
41 #include <linux/random.h>
42 #include <linux/ctype.h>
43 #include <linux/nl80211.h>
44 #include <linux/platform_device.h>
45 #include <net/cfg80211.h>
51 #ifdef CONFIG_CFG80211_REG_DEBUG
52 #define REG_DBG_PRINT(format, args...) \
54 printk(KERN_DEBUG pr_fmt(format), ##args); \
57 #define REG_DBG_PRINT(args...)
60 /* Receipt of information from last regulatory request */
61 static struct regulatory_request
*last_request
;
63 /* To trigger userspace events */
64 static struct platform_device
*reg_pdev
;
66 static struct device_type reg_device_type
= {
67 .uevent
= reg_device_uevent
,
71 * Central wireless core regulatory domains, we only need two,
72 * the current one and a world regulatory domain in case we have no
73 * information to give us an alpha2
75 const struct ieee80211_regdomain
*cfg80211_regdomain
;
78 * Protects static reg.c components:
79 * - cfg80211_world_regdom
83 static DEFINE_MUTEX(reg_mutex
);
85 static inline void assert_reg_lock(void)
87 lockdep_assert_held(®_mutex
);
90 /* Used to queue up regulatory hints */
91 static LIST_HEAD(reg_requests_list
);
92 static spinlock_t reg_requests_lock
;
94 /* Used to queue up beacon hints for review */
95 static LIST_HEAD(reg_pending_beacons
);
96 static spinlock_t reg_pending_beacons_lock
;
98 /* Used to keep track of processed beacon hints */
99 static LIST_HEAD(reg_beacon_list
);
102 struct list_head list
;
103 struct ieee80211_channel chan
;
106 static void reg_todo(struct work_struct
*work
);
107 static DECLARE_WORK(reg_work
, reg_todo
);
109 /* We keep a static world regulatory domain in case of the absence of CRDA */
110 static const struct ieee80211_regdomain world_regdom
= {
114 /* IEEE 802.11b/g, channels 1..11 */
115 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
116 /* IEEE 802.11b/g, channels 12..13. No HT40
117 * channel fits here. */
118 REG_RULE(2467-10, 2472+10, 20, 6, 20,
119 NL80211_RRF_PASSIVE_SCAN
|
120 NL80211_RRF_NO_IBSS
),
121 /* IEEE 802.11 channel 14 - Only JP enables
122 * this and for 802.11b only */
123 REG_RULE(2484-10, 2484+10, 20, 6, 20,
124 NL80211_RRF_PASSIVE_SCAN
|
125 NL80211_RRF_NO_IBSS
|
126 NL80211_RRF_NO_OFDM
),
127 /* IEEE 802.11a, channel 36..48 */
128 REG_RULE(5180-10, 5240+10, 40, 6, 20,
129 NL80211_RRF_PASSIVE_SCAN
|
130 NL80211_RRF_NO_IBSS
),
132 /* NB: 5260 MHz - 5700 MHz requies DFS */
134 /* IEEE 802.11a, channel 149..165 */
135 REG_RULE(5745-10, 5825+10, 40, 6, 20,
136 NL80211_RRF_PASSIVE_SCAN
|
137 NL80211_RRF_NO_IBSS
),
141 static const struct ieee80211_regdomain
*cfg80211_world_regdom
=
144 static char *ieee80211_regdom
= "00";
145 static char user_alpha2
[2];
147 module_param(ieee80211_regdom
, charp
, 0444);
148 MODULE_PARM_DESC(ieee80211_regdom
, "IEEE 802.11 regulatory domain code");
150 static void reset_regdomains(void)
152 /* avoid freeing static information or freeing something twice */
153 if (cfg80211_regdomain
== cfg80211_world_regdom
)
154 cfg80211_regdomain
= NULL
;
155 if (cfg80211_world_regdom
== &world_regdom
)
156 cfg80211_world_regdom
= NULL
;
157 if (cfg80211_regdomain
== &world_regdom
)
158 cfg80211_regdomain
= NULL
;
160 kfree(cfg80211_regdomain
);
161 kfree(cfg80211_world_regdom
);
163 cfg80211_world_regdom
= &world_regdom
;
164 cfg80211_regdomain
= NULL
;
168 * Dynamic world regulatory domain requested by the wireless
169 * core upon initialization
171 static void update_world_regdomain(const struct ieee80211_regdomain
*rd
)
173 BUG_ON(!last_request
);
177 cfg80211_world_regdom
= rd
;
178 cfg80211_regdomain
= rd
;
181 bool is_world_regdom(const char *alpha2
)
185 if (alpha2
[0] == '0' && alpha2
[1] == '0')
190 static bool is_alpha2_set(const char *alpha2
)
194 if (alpha2
[0] != 0 && alpha2
[1] != 0)
199 static bool is_unknown_alpha2(const char *alpha2
)
204 * Special case where regulatory domain was built by driver
205 * but a specific alpha2 cannot be determined
207 if (alpha2
[0] == '9' && alpha2
[1] == '9')
212 static bool is_intersected_alpha2(const char *alpha2
)
217 * Special case where regulatory domain is the
218 * result of an intersection between two regulatory domain
221 if (alpha2
[0] == '9' && alpha2
[1] == '8')
226 static bool is_an_alpha2(const char *alpha2
)
230 if (isalpha(alpha2
[0]) && isalpha(alpha2
[1]))
235 static bool alpha2_equal(const char *alpha2_x
, const char *alpha2_y
)
237 if (!alpha2_x
|| !alpha2_y
)
239 if (alpha2_x
[0] == alpha2_y
[0] &&
240 alpha2_x
[1] == alpha2_y
[1])
245 static bool regdom_changes(const char *alpha2
)
247 assert_cfg80211_lock();
249 if (!cfg80211_regdomain
)
251 if (alpha2_equal(cfg80211_regdomain
->alpha2
, alpha2
))
257 * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
258 * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
259 * has ever been issued.
261 static bool is_user_regdom_saved(void)
263 if (user_alpha2
[0] == '9' && user_alpha2
[1] == '7')
266 /* This would indicate a mistake on the design */
267 if (WARN((!is_world_regdom(user_alpha2
) &&
268 !is_an_alpha2(user_alpha2
)),
269 "Unexpected user alpha2: %c%c\n",
277 static int reg_copy_regd(const struct ieee80211_regdomain
**dst_regd
,
278 const struct ieee80211_regdomain
*src_regd
)
280 struct ieee80211_regdomain
*regd
;
281 int size_of_regd
= 0;
284 size_of_regd
= sizeof(struct ieee80211_regdomain
) +
285 ((src_regd
->n_reg_rules
+ 1) * sizeof(struct ieee80211_reg_rule
));
287 regd
= kzalloc(size_of_regd
, GFP_KERNEL
);
291 memcpy(regd
, src_regd
, sizeof(struct ieee80211_regdomain
));
293 for (i
= 0; i
< src_regd
->n_reg_rules
; i
++)
294 memcpy(®d
->reg_rules
[i
], &src_regd
->reg_rules
[i
],
295 sizeof(struct ieee80211_reg_rule
));
301 #ifdef CONFIG_CFG80211_INTERNAL_REGDB
302 struct reg_regdb_search_request
{
304 struct list_head list
;
307 static LIST_HEAD(reg_regdb_search_list
);
308 static DEFINE_MUTEX(reg_regdb_search_mutex
);
310 static void reg_regdb_search(struct work_struct
*work
)
312 struct reg_regdb_search_request
*request
;
313 const struct ieee80211_regdomain
*curdom
, *regdom
;
316 mutex_lock(®_regdb_search_mutex
);
317 while (!list_empty(®_regdb_search_list
)) {
318 request
= list_first_entry(®_regdb_search_list
,
319 struct reg_regdb_search_request
,
321 list_del(&request
->list
);
323 for (i
=0; i
<reg_regdb_size
; i
++) {
324 curdom
= reg_regdb
[i
];
326 if (!memcmp(request
->alpha2
, curdom
->alpha2
, 2)) {
327 r
= reg_copy_regd(®dom
, curdom
);
330 mutex_lock(&cfg80211_mutex
);
332 mutex_unlock(&cfg80211_mutex
);
339 mutex_unlock(®_regdb_search_mutex
);
342 static DECLARE_WORK(reg_regdb_work
, reg_regdb_search
);
344 static void reg_regdb_query(const char *alpha2
)
346 struct reg_regdb_search_request
*request
;
351 request
= kzalloc(sizeof(struct reg_regdb_search_request
), GFP_KERNEL
);
355 memcpy(request
->alpha2
, alpha2
, 2);
357 mutex_lock(®_regdb_search_mutex
);
358 list_add_tail(&request
->list
, ®_regdb_search_list
);
359 mutex_unlock(®_regdb_search_mutex
);
361 schedule_work(®_regdb_work
);
364 static inline void reg_regdb_query(const char *alpha2
) {}
365 #endif /* CONFIG_CFG80211_INTERNAL_REGDB */
368 * This lets us keep regulatory code which is updated on a regulatory
369 * basis in userspace. Country information is filled in by
372 static int call_crda(const char *alpha2
)
374 if (!is_world_regdom((char *) alpha2
))
375 pr_info("Calling CRDA for country: %c%c\n",
376 alpha2
[0], alpha2
[1]);
378 pr_info("Calling CRDA to update world regulatory domain\n");
380 /* query internal regulatory database (if it exists) */
381 reg_regdb_query(alpha2
);
383 return kobject_uevent(®_pdev
->dev
.kobj
, KOBJ_CHANGE
);
386 /* Used by nl80211 before kmalloc'ing our regulatory domain */
387 bool reg_is_valid_request(const char *alpha2
)
389 assert_cfg80211_lock();
394 return alpha2_equal(last_request
->alpha2
, alpha2
);
397 /* Sanity check on a regulatory rule */
398 static bool is_valid_reg_rule(const struct ieee80211_reg_rule
*rule
)
400 const struct ieee80211_freq_range
*freq_range
= &rule
->freq_range
;
403 if (freq_range
->start_freq_khz
<= 0 || freq_range
->end_freq_khz
<= 0)
406 if (freq_range
->start_freq_khz
> freq_range
->end_freq_khz
)
409 freq_diff
= freq_range
->end_freq_khz
- freq_range
->start_freq_khz
;
411 if (freq_range
->end_freq_khz
<= freq_range
->start_freq_khz
||
412 freq_range
->max_bandwidth_khz
> freq_diff
)
418 static bool is_valid_rd(const struct ieee80211_regdomain
*rd
)
420 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
423 if (!rd
->n_reg_rules
)
426 if (WARN_ON(rd
->n_reg_rules
> NL80211_MAX_SUPP_REG_RULES
))
429 for (i
= 0; i
< rd
->n_reg_rules
; i
++) {
430 reg_rule
= &rd
->reg_rules
[i
];
431 if (!is_valid_reg_rule(reg_rule
))
438 static bool reg_does_bw_fit(const struct ieee80211_freq_range
*freq_range
,
442 u32 start_freq_khz
, end_freq_khz
;
444 start_freq_khz
= center_freq_khz
- (bw_khz
/2);
445 end_freq_khz
= center_freq_khz
+ (bw_khz
/2);
447 if (start_freq_khz
>= freq_range
->start_freq_khz
&&
448 end_freq_khz
<= freq_range
->end_freq_khz
)
455 * freq_in_rule_band - tells us if a frequency is in a frequency band
456 * @freq_range: frequency rule we want to query
457 * @freq_khz: frequency we are inquiring about
459 * This lets us know if a specific frequency rule is or is not relevant to
460 * a specific frequency's band. Bands are device specific and artificial
461 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
462 * safe for now to assume that a frequency rule should not be part of a
463 * frequency's band if the start freq or end freq are off by more than 2 GHz.
464 * This resolution can be lowered and should be considered as we add
465 * regulatory rule support for other "bands".
467 static bool freq_in_rule_band(const struct ieee80211_freq_range
*freq_range
,
470 #define ONE_GHZ_IN_KHZ 1000000
471 if (abs(freq_khz
- freq_range
->start_freq_khz
) <= (2 * ONE_GHZ_IN_KHZ
))
473 if (abs(freq_khz
- freq_range
->end_freq_khz
) <= (2 * ONE_GHZ_IN_KHZ
))
476 #undef ONE_GHZ_IN_KHZ
480 * Helper for regdom_intersect(), this does the real
481 * mathematical intersection fun
483 static int reg_rules_intersect(
484 const struct ieee80211_reg_rule
*rule1
,
485 const struct ieee80211_reg_rule
*rule2
,
486 struct ieee80211_reg_rule
*intersected_rule
)
488 const struct ieee80211_freq_range
*freq_range1
, *freq_range2
;
489 struct ieee80211_freq_range
*freq_range
;
490 const struct ieee80211_power_rule
*power_rule1
, *power_rule2
;
491 struct ieee80211_power_rule
*power_rule
;
494 freq_range1
= &rule1
->freq_range
;
495 freq_range2
= &rule2
->freq_range
;
496 freq_range
= &intersected_rule
->freq_range
;
498 power_rule1
= &rule1
->power_rule
;
499 power_rule2
= &rule2
->power_rule
;
500 power_rule
= &intersected_rule
->power_rule
;
502 freq_range
->start_freq_khz
= max(freq_range1
->start_freq_khz
,
503 freq_range2
->start_freq_khz
);
504 freq_range
->end_freq_khz
= min(freq_range1
->end_freq_khz
,
505 freq_range2
->end_freq_khz
);
506 freq_range
->max_bandwidth_khz
= min(freq_range1
->max_bandwidth_khz
,
507 freq_range2
->max_bandwidth_khz
);
509 freq_diff
= freq_range
->end_freq_khz
- freq_range
->start_freq_khz
;
510 if (freq_range
->max_bandwidth_khz
> freq_diff
)
511 freq_range
->max_bandwidth_khz
= freq_diff
;
513 power_rule
->max_eirp
= min(power_rule1
->max_eirp
,
514 power_rule2
->max_eirp
);
515 power_rule
->max_antenna_gain
= min(power_rule1
->max_antenna_gain
,
516 power_rule2
->max_antenna_gain
);
518 intersected_rule
->flags
= (rule1
->flags
| rule2
->flags
);
520 if (!is_valid_reg_rule(intersected_rule
))
527 * regdom_intersect - do the intersection between two regulatory domains
528 * @rd1: first regulatory domain
529 * @rd2: second regulatory domain
531 * Use this function to get the intersection between two regulatory domains.
532 * Once completed we will mark the alpha2 for the rd as intersected, "98",
533 * as no one single alpha2 can represent this regulatory domain.
535 * Returns a pointer to the regulatory domain structure which will hold the
536 * resulting intersection of rules between rd1 and rd2. We will
537 * kzalloc() this structure for you.
539 static struct ieee80211_regdomain
*regdom_intersect(
540 const struct ieee80211_regdomain
*rd1
,
541 const struct ieee80211_regdomain
*rd2
)
545 unsigned int num_rules
= 0, rule_idx
= 0;
546 const struct ieee80211_reg_rule
*rule1
, *rule2
;
547 struct ieee80211_reg_rule
*intersected_rule
;
548 struct ieee80211_regdomain
*rd
;
549 /* This is just a dummy holder to help us count */
550 struct ieee80211_reg_rule irule
;
552 /* Uses the stack temporarily for counter arithmetic */
553 intersected_rule
= &irule
;
555 memset(intersected_rule
, 0, sizeof(struct ieee80211_reg_rule
));
561 * First we get a count of the rules we'll need, then we actually
562 * build them. This is to so we can malloc() and free() a
563 * regdomain once. The reason we use reg_rules_intersect() here
564 * is it will return -EINVAL if the rule computed makes no sense.
565 * All rules that do check out OK are valid.
568 for (x
= 0; x
< rd1
->n_reg_rules
; x
++) {
569 rule1
= &rd1
->reg_rules
[x
];
570 for (y
= 0; y
< rd2
->n_reg_rules
; y
++) {
571 rule2
= &rd2
->reg_rules
[y
];
572 if (!reg_rules_intersect(rule1
, rule2
,
575 memset(intersected_rule
, 0,
576 sizeof(struct ieee80211_reg_rule
));
583 size_of_regd
= sizeof(struct ieee80211_regdomain
) +
584 ((num_rules
+ 1) * sizeof(struct ieee80211_reg_rule
));
586 rd
= kzalloc(size_of_regd
, GFP_KERNEL
);
590 for (x
= 0; x
< rd1
->n_reg_rules
; x
++) {
591 rule1
= &rd1
->reg_rules
[x
];
592 for (y
= 0; y
< rd2
->n_reg_rules
; y
++) {
593 rule2
= &rd2
->reg_rules
[y
];
595 * This time around instead of using the stack lets
596 * write to the target rule directly saving ourselves
599 intersected_rule
= &rd
->reg_rules
[rule_idx
];
600 r
= reg_rules_intersect(rule1
, rule2
,
603 * No need to memset here the intersected rule here as
604 * we're not using the stack anymore
612 if (rule_idx
!= num_rules
) {
617 rd
->n_reg_rules
= num_rules
;
625 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
626 * want to just have the channel structure use these
628 static u32
map_regdom_flags(u32 rd_flags
)
630 u32 channel_flags
= 0;
631 if (rd_flags
& NL80211_RRF_PASSIVE_SCAN
)
632 channel_flags
|= IEEE80211_CHAN_PASSIVE_SCAN
;
633 if (rd_flags
& NL80211_RRF_NO_IBSS
)
634 channel_flags
|= IEEE80211_CHAN_NO_IBSS
;
635 if (rd_flags
& NL80211_RRF_DFS
)
636 channel_flags
|= IEEE80211_CHAN_RADAR
;
637 return channel_flags
;
640 static int freq_reg_info_regd(struct wiphy
*wiphy
,
643 const struct ieee80211_reg_rule
**reg_rule
,
644 const struct ieee80211_regdomain
*custom_regd
)
647 bool band_rule_found
= false;
648 const struct ieee80211_regdomain
*regd
;
649 bool bw_fits
= false;
652 desired_bw_khz
= MHZ_TO_KHZ(20);
654 regd
= custom_regd
? custom_regd
: cfg80211_regdomain
;
657 * Follow the driver's regulatory domain, if present, unless a country
658 * IE has been processed or a user wants to help complaince further
661 last_request
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
662 last_request
->initiator
!= NL80211_REGDOM_SET_BY_USER
&&
669 for (i
= 0; i
< regd
->n_reg_rules
; i
++) {
670 const struct ieee80211_reg_rule
*rr
;
671 const struct ieee80211_freq_range
*fr
= NULL
;
672 const struct ieee80211_power_rule
*pr
= NULL
;
674 rr
= ®d
->reg_rules
[i
];
675 fr
= &rr
->freq_range
;
676 pr
= &rr
->power_rule
;
679 * We only need to know if one frequency rule was
680 * was in center_freq's band, that's enough, so lets
681 * not overwrite it once found
683 if (!band_rule_found
)
684 band_rule_found
= freq_in_rule_band(fr
, center_freq
);
686 bw_fits
= reg_does_bw_fit(fr
,
690 if (band_rule_found
&& bw_fits
) {
696 if (!band_rule_found
)
702 int freq_reg_info(struct wiphy
*wiphy
,
705 const struct ieee80211_reg_rule
**reg_rule
)
707 assert_cfg80211_lock();
708 return freq_reg_info_regd(wiphy
,
714 EXPORT_SYMBOL(freq_reg_info
);
716 #ifdef CONFIG_CFG80211_REG_DEBUG
717 static const char *reg_initiator_name(enum nl80211_reg_initiator initiator
)
720 case NL80211_REGDOM_SET_BY_CORE
:
721 return "Set by core";
722 case NL80211_REGDOM_SET_BY_USER
:
723 return "Set by user";
724 case NL80211_REGDOM_SET_BY_DRIVER
:
725 return "Set by driver";
726 case NL80211_REGDOM_SET_BY_COUNTRY_IE
:
727 return "Set by country IE";
734 static void chan_reg_rule_print_dbg(struct ieee80211_channel
*chan
,
736 const struct ieee80211_reg_rule
*reg_rule
)
738 const struct ieee80211_power_rule
*power_rule
;
739 const struct ieee80211_freq_range
*freq_range
;
740 char max_antenna_gain
[32];
742 power_rule
= ®_rule
->power_rule
;
743 freq_range
= ®_rule
->freq_range
;
745 if (!power_rule
->max_antenna_gain
)
746 snprintf(max_antenna_gain
, 32, "N/A");
748 snprintf(max_antenna_gain
, 32, "%d", power_rule
->max_antenna_gain
);
750 REG_DBG_PRINT("Updating information on frequency %d MHz "
751 "for a %d MHz width channel with regulatory rule:\n",
753 KHZ_TO_MHZ(desired_bw_khz
));
755 REG_DBG_PRINT("%d KHz - %d KHz @ KHz), (%s mBi, %d mBm)\n",
756 freq_range
->start_freq_khz
,
757 freq_range
->end_freq_khz
,
759 power_rule
->max_eirp
);
762 static void chan_reg_rule_print_dbg(struct ieee80211_channel
*chan
,
764 const struct ieee80211_reg_rule
*reg_rule
)
771 * Note that right now we assume the desired channel bandwidth
772 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
773 * per channel, the primary and the extension channel). To support
774 * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a
775 * new ieee80211_channel.target_bw and re run the regulatory check
776 * on the wiphy with the target_bw specified. Then we can simply use
777 * that below for the desired_bw_khz below.
779 static void handle_channel(struct wiphy
*wiphy
,
780 enum nl80211_reg_initiator initiator
,
781 enum ieee80211_band band
,
782 unsigned int chan_idx
)
785 u32 flags
, bw_flags
= 0;
786 u32 desired_bw_khz
= MHZ_TO_KHZ(20);
787 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
788 const struct ieee80211_power_rule
*power_rule
= NULL
;
789 const struct ieee80211_freq_range
*freq_range
= NULL
;
790 struct ieee80211_supported_band
*sband
;
791 struct ieee80211_channel
*chan
;
792 struct wiphy
*request_wiphy
= NULL
;
794 assert_cfg80211_lock();
796 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
798 sband
= wiphy
->bands
[band
];
799 BUG_ON(chan_idx
>= sband
->n_channels
);
800 chan
= &sband
->channels
[chan_idx
];
802 flags
= chan
->orig_flags
;
804 r
= freq_reg_info(wiphy
,
805 MHZ_TO_KHZ(chan
->center_freq
),
811 * We will disable all channels that do not match our
812 * recieved regulatory rule unless the hint is coming
813 * from a Country IE and the Country IE had no information
814 * about a band. The IEEE 802.11 spec allows for an AP
815 * to send only a subset of the regulatory rules allowed,
816 * so an AP in the US that only supports 2.4 GHz may only send
817 * a country IE with information for the 2.4 GHz band
818 * while 5 GHz is still supported.
820 if (initiator
== NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
824 REG_DBG_PRINT("Disabling freq %d MHz\n", chan
->center_freq
);
825 chan
->flags
= IEEE80211_CHAN_DISABLED
;
829 chan_reg_rule_print_dbg(chan
, desired_bw_khz
, reg_rule
);
831 power_rule
= ®_rule
->power_rule
;
832 freq_range
= ®_rule
->freq_range
;
834 if (freq_range
->max_bandwidth_khz
< MHZ_TO_KHZ(40))
835 bw_flags
= IEEE80211_CHAN_NO_HT40
;
837 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
&&
838 request_wiphy
&& request_wiphy
== wiphy
&&
839 request_wiphy
->flags
& WIPHY_FLAG_STRICT_REGULATORY
) {
841 * This gaurantees the driver's requested regulatory domain
842 * will always be used as a base for further regulatory
845 chan
->flags
= chan
->orig_flags
=
846 map_regdom_flags(reg_rule
->flags
) | bw_flags
;
847 chan
->max_antenna_gain
= chan
->orig_mag
=
848 (int) MBI_TO_DBI(power_rule
->max_antenna_gain
);
849 chan
->max_power
= chan
->orig_mpwr
=
850 (int) MBM_TO_DBM(power_rule
->max_eirp
);
854 chan
->flags
= flags
| bw_flags
| map_regdom_flags(reg_rule
->flags
);
855 chan
->max_antenna_gain
= min(chan
->orig_mag
,
856 (int) MBI_TO_DBI(power_rule
->max_antenna_gain
));
858 chan
->max_power
= min(chan
->orig_mpwr
,
859 (int) MBM_TO_DBM(power_rule
->max_eirp
));
861 chan
->max_power
= (int) MBM_TO_DBM(power_rule
->max_eirp
);
864 static void handle_band(struct wiphy
*wiphy
,
865 enum ieee80211_band band
,
866 enum nl80211_reg_initiator initiator
)
869 struct ieee80211_supported_band
*sband
;
871 BUG_ON(!wiphy
->bands
[band
]);
872 sband
= wiphy
->bands
[band
];
874 for (i
= 0; i
< sband
->n_channels
; i
++)
875 handle_channel(wiphy
, initiator
, band
, i
);
878 static bool ignore_reg_update(struct wiphy
*wiphy
,
879 enum nl80211_reg_initiator initiator
)
882 REG_DBG_PRINT("Ignoring regulatory request %s since "
883 "last_request is not set\n",
884 reg_initiator_name(initiator
));
888 if (initiator
== NL80211_REGDOM_SET_BY_CORE
&&
889 wiphy
->flags
& WIPHY_FLAG_CUSTOM_REGULATORY
) {
890 REG_DBG_PRINT("Ignoring regulatory request %s "
891 "since the driver uses its own custom "
892 "regulatory domain ",
893 reg_initiator_name(initiator
));
898 * wiphy->regd will be set once the device has its own
899 * desired regulatory domain set
901 if (wiphy
->flags
& WIPHY_FLAG_STRICT_REGULATORY
&& !wiphy
->regd
&&
902 initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
903 !is_world_regdom(last_request
->alpha2
)) {
904 REG_DBG_PRINT("Ignoring regulatory request %s "
905 "since the driver requires its own regulaotry "
906 "domain to be set first",
907 reg_initiator_name(initiator
));
914 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator
)
916 struct cfg80211_registered_device
*rdev
;
918 list_for_each_entry(rdev
, &cfg80211_rdev_list
, list
)
919 wiphy_update_regulatory(&rdev
->wiphy
, initiator
);
922 static void handle_reg_beacon(struct wiphy
*wiphy
,
923 unsigned int chan_idx
,
924 struct reg_beacon
*reg_beacon
)
926 struct ieee80211_supported_band
*sband
;
927 struct ieee80211_channel
*chan
;
928 bool channel_changed
= false;
929 struct ieee80211_channel chan_before
;
931 assert_cfg80211_lock();
933 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
934 chan
= &sband
->channels
[chan_idx
];
936 if (likely(chan
->center_freq
!= reg_beacon
->chan
.center_freq
))
939 if (chan
->beacon_found
)
942 chan
->beacon_found
= true;
944 if (wiphy
->flags
& WIPHY_FLAG_DISABLE_BEACON_HINTS
)
947 chan_before
.center_freq
= chan
->center_freq
;
948 chan_before
.flags
= chan
->flags
;
950 if (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
) {
951 chan
->flags
&= ~IEEE80211_CHAN_PASSIVE_SCAN
;
952 channel_changed
= true;
955 if (chan
->flags
& IEEE80211_CHAN_NO_IBSS
) {
956 chan
->flags
&= ~IEEE80211_CHAN_NO_IBSS
;
957 channel_changed
= true;
961 nl80211_send_beacon_hint_event(wiphy
, &chan_before
, chan
);
965 * Called when a scan on a wiphy finds a beacon on
968 static void wiphy_update_new_beacon(struct wiphy
*wiphy
,
969 struct reg_beacon
*reg_beacon
)
972 struct ieee80211_supported_band
*sband
;
974 assert_cfg80211_lock();
976 if (!wiphy
->bands
[reg_beacon
->chan
.band
])
979 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
981 for (i
= 0; i
< sband
->n_channels
; i
++)
982 handle_reg_beacon(wiphy
, i
, reg_beacon
);
986 * Called upon reg changes or a new wiphy is added
988 static void wiphy_update_beacon_reg(struct wiphy
*wiphy
)
991 struct ieee80211_supported_band
*sband
;
992 struct reg_beacon
*reg_beacon
;
994 assert_cfg80211_lock();
996 if (list_empty(®_beacon_list
))
999 list_for_each_entry(reg_beacon
, ®_beacon_list
, list
) {
1000 if (!wiphy
->bands
[reg_beacon
->chan
.band
])
1002 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
1003 for (i
= 0; i
< sband
->n_channels
; i
++)
1004 handle_reg_beacon(wiphy
, i
, reg_beacon
);
1008 static bool reg_is_world_roaming(struct wiphy
*wiphy
)
1010 if (is_world_regdom(cfg80211_regdomain
->alpha2
) ||
1011 (wiphy
->regd
&& is_world_regdom(wiphy
->regd
->alpha2
)))
1014 last_request
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
1015 wiphy
->flags
& WIPHY_FLAG_CUSTOM_REGULATORY
)
1020 /* Reap the advantages of previously found beacons */
1021 static void reg_process_beacons(struct wiphy
*wiphy
)
1024 * Means we are just firing up cfg80211, so no beacons would
1025 * have been processed yet.
1029 if (!reg_is_world_roaming(wiphy
))
1031 wiphy_update_beacon_reg(wiphy
);
1034 static bool is_ht40_not_allowed(struct ieee80211_channel
*chan
)
1038 if (chan
->flags
& IEEE80211_CHAN_DISABLED
)
1040 /* This would happen when regulatory rules disallow HT40 completely */
1041 if (IEEE80211_CHAN_NO_HT40
== (chan
->flags
& (IEEE80211_CHAN_NO_HT40
)))
1046 static void reg_process_ht_flags_channel(struct wiphy
*wiphy
,
1047 enum ieee80211_band band
,
1048 unsigned int chan_idx
)
1050 struct ieee80211_supported_band
*sband
;
1051 struct ieee80211_channel
*channel
;
1052 struct ieee80211_channel
*channel_before
= NULL
, *channel_after
= NULL
;
1055 assert_cfg80211_lock();
1057 sband
= wiphy
->bands
[band
];
1058 BUG_ON(chan_idx
>= sband
->n_channels
);
1059 channel
= &sband
->channels
[chan_idx
];
1061 if (is_ht40_not_allowed(channel
)) {
1062 channel
->flags
|= IEEE80211_CHAN_NO_HT40
;
1067 * We need to ensure the extension channels exist to
1068 * be able to use HT40- or HT40+, this finds them (or not)
1070 for (i
= 0; i
< sband
->n_channels
; i
++) {
1071 struct ieee80211_channel
*c
= &sband
->channels
[i
];
1072 if (c
->center_freq
== (channel
->center_freq
- 20))
1074 if (c
->center_freq
== (channel
->center_freq
+ 20))
1079 * Please note that this assumes target bandwidth is 20 MHz,
1080 * if that ever changes we also need to change the below logic
1081 * to include that as well.
1083 if (is_ht40_not_allowed(channel_before
))
1084 channel
->flags
|= IEEE80211_CHAN_NO_HT40MINUS
;
1086 channel
->flags
&= ~IEEE80211_CHAN_NO_HT40MINUS
;
1088 if (is_ht40_not_allowed(channel_after
))
1089 channel
->flags
|= IEEE80211_CHAN_NO_HT40PLUS
;
1091 channel
->flags
&= ~IEEE80211_CHAN_NO_HT40PLUS
;
1094 static void reg_process_ht_flags_band(struct wiphy
*wiphy
,
1095 enum ieee80211_band band
)
1098 struct ieee80211_supported_band
*sband
;
1100 BUG_ON(!wiphy
->bands
[band
]);
1101 sband
= wiphy
->bands
[band
];
1103 for (i
= 0; i
< sband
->n_channels
; i
++)
1104 reg_process_ht_flags_channel(wiphy
, band
, i
);
1107 static void reg_process_ht_flags(struct wiphy
*wiphy
)
1109 enum ieee80211_band band
;
1114 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
1115 if (wiphy
->bands
[band
])
1116 reg_process_ht_flags_band(wiphy
, band
);
1121 void wiphy_update_regulatory(struct wiphy
*wiphy
,
1122 enum nl80211_reg_initiator initiator
)
1124 enum ieee80211_band band
;
1126 if (ignore_reg_update(wiphy
, initiator
))
1128 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
1129 if (wiphy
->bands
[band
])
1130 handle_band(wiphy
, band
, initiator
);
1133 reg_process_beacons(wiphy
);
1134 reg_process_ht_flags(wiphy
);
1135 if (wiphy
->reg_notifier
)
1136 wiphy
->reg_notifier(wiphy
, last_request
);
1139 static void handle_channel_custom(struct wiphy
*wiphy
,
1140 enum ieee80211_band band
,
1141 unsigned int chan_idx
,
1142 const struct ieee80211_regdomain
*regd
)
1145 u32 desired_bw_khz
= MHZ_TO_KHZ(20);
1147 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
1148 const struct ieee80211_power_rule
*power_rule
= NULL
;
1149 const struct ieee80211_freq_range
*freq_range
= NULL
;
1150 struct ieee80211_supported_band
*sband
;
1151 struct ieee80211_channel
*chan
;
1155 sband
= wiphy
->bands
[band
];
1156 BUG_ON(chan_idx
>= sband
->n_channels
);
1157 chan
= &sband
->channels
[chan_idx
];
1159 r
= freq_reg_info_regd(wiphy
,
1160 MHZ_TO_KHZ(chan
->center_freq
),
1166 REG_DBG_PRINT("Disabling freq %d MHz as custom "
1167 "regd has no rule that fits a %d MHz "
1170 KHZ_TO_MHZ(desired_bw_khz
));
1171 chan
->flags
= IEEE80211_CHAN_DISABLED
;
1175 chan_reg_rule_print_dbg(chan
, desired_bw_khz
, reg_rule
);
1177 power_rule
= ®_rule
->power_rule
;
1178 freq_range
= ®_rule
->freq_range
;
1180 if (freq_range
->max_bandwidth_khz
< MHZ_TO_KHZ(40))
1181 bw_flags
= IEEE80211_CHAN_NO_HT40
;
1183 chan
->flags
|= map_regdom_flags(reg_rule
->flags
) | bw_flags
;
1184 chan
->max_antenna_gain
= (int) MBI_TO_DBI(power_rule
->max_antenna_gain
);
1185 chan
->max_power
= (int) MBM_TO_DBM(power_rule
->max_eirp
);
1188 static void handle_band_custom(struct wiphy
*wiphy
, enum ieee80211_band band
,
1189 const struct ieee80211_regdomain
*regd
)
1192 struct ieee80211_supported_band
*sband
;
1194 BUG_ON(!wiphy
->bands
[band
]);
1195 sband
= wiphy
->bands
[band
];
1197 for (i
= 0; i
< sband
->n_channels
; i
++)
1198 handle_channel_custom(wiphy
, band
, i
, regd
);
1201 /* Used by drivers prior to wiphy registration */
1202 void wiphy_apply_custom_regulatory(struct wiphy
*wiphy
,
1203 const struct ieee80211_regdomain
*regd
)
1205 enum ieee80211_band band
;
1206 unsigned int bands_set
= 0;
1208 mutex_lock(®_mutex
);
1209 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
1210 if (!wiphy
->bands
[band
])
1212 handle_band_custom(wiphy
, band
, regd
);
1215 mutex_unlock(®_mutex
);
1218 * no point in calling this if it won't have any effect
1219 * on your device's supportd bands.
1221 WARN_ON(!bands_set
);
1223 EXPORT_SYMBOL(wiphy_apply_custom_regulatory
);
1226 * Return value which can be used by ignore_request() to indicate
1227 * it has been determined we should intersect two regulatory domains
1229 #define REG_INTERSECT 1
1231 /* This has the logic which determines when a new request
1232 * should be ignored. */
1233 static int ignore_request(struct wiphy
*wiphy
,
1234 struct regulatory_request
*pending_request
)
1236 struct wiphy
*last_wiphy
= NULL
;
1238 assert_cfg80211_lock();
1240 /* All initial requests are respected */
1244 switch (pending_request
->initiator
) {
1245 case NL80211_REGDOM_SET_BY_CORE
:
1247 case NL80211_REGDOM_SET_BY_COUNTRY_IE
:
1249 last_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
1251 if (unlikely(!is_an_alpha2(pending_request
->alpha2
)))
1253 if (last_request
->initiator
==
1254 NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
1255 if (last_wiphy
!= wiphy
) {
1257 * Two cards with two APs claiming different
1258 * Country IE alpha2s. We could
1259 * intersect them, but that seems unlikely
1260 * to be correct. Reject second one for now.
1262 if (regdom_changes(pending_request
->alpha2
))
1267 * Two consecutive Country IE hints on the same wiphy.
1268 * This should be picked up early by the driver/stack
1270 if (WARN_ON(regdom_changes(pending_request
->alpha2
)))
1275 case NL80211_REGDOM_SET_BY_DRIVER
:
1276 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_CORE
) {
1277 if (regdom_changes(pending_request
->alpha2
))
1283 * This would happen if you unplug and plug your card
1284 * back in or if you add a new device for which the previously
1285 * loaded card also agrees on the regulatory domain.
1287 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
&&
1288 !regdom_changes(pending_request
->alpha2
))
1291 return REG_INTERSECT
;
1292 case NL80211_REGDOM_SET_BY_USER
:
1293 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_COUNTRY_IE
)
1294 return REG_INTERSECT
;
1296 * If the user knows better the user should set the regdom
1297 * to their country before the IE is picked up
1299 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_USER
&&
1300 last_request
->intersect
)
1303 * Process user requests only after previous user/driver/core
1304 * requests have been processed
1306 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_CORE
||
1307 last_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
||
1308 last_request
->initiator
== NL80211_REGDOM_SET_BY_USER
) {
1309 if (regdom_changes(last_request
->alpha2
))
1313 if (!regdom_changes(pending_request
->alpha2
))
1322 static void reg_set_request_processed(void)
1324 bool need_more_processing
= false;
1326 last_request
->processed
= true;
1328 spin_lock(®_requests_lock
);
1329 if (!list_empty(®_requests_list
))
1330 need_more_processing
= true;
1331 spin_unlock(®_requests_lock
);
1333 if (need_more_processing
)
1334 schedule_work(®_work
);
1338 * __regulatory_hint - hint to the wireless core a regulatory domain
1339 * @wiphy: if the hint comes from country information from an AP, this
1340 * is required to be set to the wiphy that received the information
1341 * @pending_request: the regulatory request currently being processed
1343 * The Wireless subsystem can use this function to hint to the wireless core
1344 * what it believes should be the current regulatory domain.
1346 * Returns zero if all went fine, %-EALREADY if a regulatory domain had
1347 * already been set or other standard error codes.
1349 * Caller must hold &cfg80211_mutex and ®_mutex
1351 static int __regulatory_hint(struct wiphy
*wiphy
,
1352 struct regulatory_request
*pending_request
)
1354 bool intersect
= false;
1357 assert_cfg80211_lock();
1359 r
= ignore_request(wiphy
, pending_request
);
1361 if (r
== REG_INTERSECT
) {
1362 if (pending_request
->initiator
==
1363 NL80211_REGDOM_SET_BY_DRIVER
) {
1364 r
= reg_copy_regd(&wiphy
->regd
, cfg80211_regdomain
);
1366 kfree(pending_request
);
1373 * If the regulatory domain being requested by the
1374 * driver has already been set just copy it to the
1377 if (r
== -EALREADY
&&
1378 pending_request
->initiator
==
1379 NL80211_REGDOM_SET_BY_DRIVER
) {
1380 r
= reg_copy_regd(&wiphy
->regd
, cfg80211_regdomain
);
1382 kfree(pending_request
);
1388 kfree(pending_request
);
1393 kfree(last_request
);
1395 last_request
= pending_request
;
1396 last_request
->intersect
= intersect
;
1398 pending_request
= NULL
;
1400 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_USER
) {
1401 user_alpha2
[0] = last_request
->alpha2
[0];
1402 user_alpha2
[1] = last_request
->alpha2
[1];
1405 /* When r == REG_INTERSECT we do need to call CRDA */
1408 * Since CRDA will not be called in this case as we already
1409 * have applied the requested regulatory domain before we just
1410 * inform userspace we have processed the request
1412 if (r
== -EALREADY
) {
1413 nl80211_send_reg_change_event(last_request
);
1414 reg_set_request_processed();
1419 return call_crda(last_request
->alpha2
);
1422 /* This processes *all* regulatory hints */
1423 static void reg_process_hint(struct regulatory_request
*reg_request
)
1426 struct wiphy
*wiphy
= NULL
;
1427 enum nl80211_reg_initiator initiator
= reg_request
->initiator
;
1429 BUG_ON(!reg_request
->alpha2
);
1431 if (wiphy_idx_valid(reg_request
->wiphy_idx
))
1432 wiphy
= wiphy_idx_to_wiphy(reg_request
->wiphy_idx
);
1434 if (reg_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
&&
1440 r
= __regulatory_hint(wiphy
, reg_request
);
1441 /* This is required so that the orig_* parameters are saved */
1442 if (r
== -EALREADY
&& wiphy
&&
1443 wiphy
->flags
& WIPHY_FLAG_STRICT_REGULATORY
)
1444 wiphy_update_regulatory(wiphy
, initiator
);
1448 * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
1449 * Regulatory hints come on a first come first serve basis and we
1450 * must process each one atomically.
1452 static void reg_process_pending_hints(void)
1454 struct regulatory_request
*reg_request
;
1456 mutex_lock(&cfg80211_mutex
);
1457 mutex_lock(®_mutex
);
1459 /* When last_request->processed becomes true this will be rescheduled */
1460 if (last_request
&& !last_request
->processed
) {
1461 REG_DBG_PRINT("Pending regulatory request, waiting "
1462 "for it to be processed...");
1466 spin_lock(®_requests_lock
);
1468 if (list_empty(®_requests_list
)) {
1469 spin_unlock(®_requests_lock
);
1473 reg_request
= list_first_entry(®_requests_list
,
1474 struct regulatory_request
,
1476 list_del_init(®_request
->list
);
1478 spin_unlock(®_requests_lock
);
1480 reg_process_hint(reg_request
);
1483 mutex_unlock(®_mutex
);
1484 mutex_unlock(&cfg80211_mutex
);
1487 /* Processes beacon hints -- this has nothing to do with country IEs */
1488 static void reg_process_pending_beacon_hints(void)
1490 struct cfg80211_registered_device
*rdev
;
1491 struct reg_beacon
*pending_beacon
, *tmp
;
1494 * No need to hold the reg_mutex here as we just touch wiphys
1495 * and do not read or access regulatory variables.
1497 mutex_lock(&cfg80211_mutex
);
1499 /* This goes through the _pending_ beacon list */
1500 spin_lock_bh(®_pending_beacons_lock
);
1502 if (list_empty(®_pending_beacons
)) {
1503 spin_unlock_bh(®_pending_beacons_lock
);
1507 list_for_each_entry_safe(pending_beacon
, tmp
,
1508 ®_pending_beacons
, list
) {
1510 list_del_init(&pending_beacon
->list
);
1512 /* Applies the beacon hint to current wiphys */
1513 list_for_each_entry(rdev
, &cfg80211_rdev_list
, list
)
1514 wiphy_update_new_beacon(&rdev
->wiphy
, pending_beacon
);
1516 /* Remembers the beacon hint for new wiphys or reg changes */
1517 list_add_tail(&pending_beacon
->list
, ®_beacon_list
);
1520 spin_unlock_bh(®_pending_beacons_lock
);
1522 mutex_unlock(&cfg80211_mutex
);
1525 static void reg_todo(struct work_struct
*work
)
1527 reg_process_pending_hints();
1528 reg_process_pending_beacon_hints();
1531 static void queue_regulatory_request(struct regulatory_request
*request
)
1533 if (isalpha(request
->alpha2
[0]))
1534 request
->alpha2
[0] = toupper(request
->alpha2
[0]);
1535 if (isalpha(request
->alpha2
[1]))
1536 request
->alpha2
[1] = toupper(request
->alpha2
[1]);
1538 spin_lock(®_requests_lock
);
1539 list_add_tail(&request
->list
, ®_requests_list
);
1540 spin_unlock(®_requests_lock
);
1542 schedule_work(®_work
);
1546 * Core regulatory hint -- happens during cfg80211_init()
1547 * and when we restore regulatory settings.
1549 static int regulatory_hint_core(const char *alpha2
)
1551 struct regulatory_request
*request
;
1553 kfree(last_request
);
1554 last_request
= NULL
;
1556 request
= kzalloc(sizeof(struct regulatory_request
),
1561 request
->alpha2
[0] = alpha2
[0];
1562 request
->alpha2
[1] = alpha2
[1];
1563 request
->initiator
= NL80211_REGDOM_SET_BY_CORE
;
1565 queue_regulatory_request(request
);
1571 int regulatory_hint_user(const char *alpha2
)
1573 struct regulatory_request
*request
;
1577 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
1581 request
->wiphy_idx
= WIPHY_IDX_STALE
;
1582 request
->alpha2
[0] = alpha2
[0];
1583 request
->alpha2
[1] = alpha2
[1];
1584 request
->initiator
= NL80211_REGDOM_SET_BY_USER
;
1586 queue_regulatory_request(request
);
1592 int regulatory_hint(struct wiphy
*wiphy
, const char *alpha2
)
1594 struct regulatory_request
*request
;
1599 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
1603 request
->wiphy_idx
= get_wiphy_idx(wiphy
);
1605 /* Must have registered wiphy first */
1606 BUG_ON(!wiphy_idx_valid(request
->wiphy_idx
));
1608 request
->alpha2
[0] = alpha2
[0];
1609 request
->alpha2
[1] = alpha2
[1];
1610 request
->initiator
= NL80211_REGDOM_SET_BY_DRIVER
;
1612 queue_regulatory_request(request
);
1616 EXPORT_SYMBOL(regulatory_hint
);
1619 * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and
1620 * therefore cannot iterate over the rdev list here.
1622 void regulatory_hint_11d(struct wiphy
*wiphy
,
1623 enum ieee80211_band band
,
1628 enum environment_cap env
= ENVIRON_ANY
;
1629 struct regulatory_request
*request
;
1631 mutex_lock(®_mutex
);
1633 if (unlikely(!last_request
))
1636 /* IE len must be evenly divisible by 2 */
1637 if (country_ie_len
& 0x01)
1640 if (country_ie_len
< IEEE80211_COUNTRY_IE_MIN_LEN
)
1643 alpha2
[0] = country_ie
[0];
1644 alpha2
[1] = country_ie
[1];
1646 if (country_ie
[2] == 'I')
1647 env
= ENVIRON_INDOOR
;
1648 else if (country_ie
[2] == 'O')
1649 env
= ENVIRON_OUTDOOR
;
1652 * We will run this only upon a successful connection on cfg80211.
1653 * We leave conflict resolution to the workqueue, where can hold
1656 if (likely(last_request
->initiator
==
1657 NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
1658 wiphy_idx_valid(last_request
->wiphy_idx
)))
1661 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
1665 request
->wiphy_idx
= get_wiphy_idx(wiphy
);
1666 request
->alpha2
[0] = alpha2
[0];
1667 request
->alpha2
[1] = alpha2
[1];
1668 request
->initiator
= NL80211_REGDOM_SET_BY_COUNTRY_IE
;
1669 request
->country_ie_env
= env
;
1671 mutex_unlock(®_mutex
);
1673 queue_regulatory_request(request
);
1678 mutex_unlock(®_mutex
);
1681 static void restore_alpha2(char *alpha2
, bool reset_user
)
1683 /* indicates there is no alpha2 to consider for restoration */
1687 /* The user setting has precedence over the module parameter */
1688 if (is_user_regdom_saved()) {
1689 /* Unless we're asked to ignore it and reset it */
1691 REG_DBG_PRINT("Restoring regulatory settings "
1692 "including user preference\n");
1693 user_alpha2
[0] = '9';
1694 user_alpha2
[1] = '7';
1697 * If we're ignoring user settings, we still need to
1698 * check the module parameter to ensure we put things
1699 * back as they were for a full restore.
1701 if (!is_world_regdom(ieee80211_regdom
)) {
1702 REG_DBG_PRINT("Keeping preference on "
1703 "module parameter ieee80211_regdom: %c%c\n",
1704 ieee80211_regdom
[0],
1705 ieee80211_regdom
[1]);
1706 alpha2
[0] = ieee80211_regdom
[0];
1707 alpha2
[1] = ieee80211_regdom
[1];
1710 REG_DBG_PRINT("Restoring regulatory settings "
1711 "while preserving user preference for: %c%c\n",
1714 alpha2
[0] = user_alpha2
[0];
1715 alpha2
[1] = user_alpha2
[1];
1717 } else if (!is_world_regdom(ieee80211_regdom
)) {
1718 REG_DBG_PRINT("Keeping preference on "
1719 "module parameter ieee80211_regdom: %c%c\n",
1720 ieee80211_regdom
[0],
1721 ieee80211_regdom
[1]);
1722 alpha2
[0] = ieee80211_regdom
[0];
1723 alpha2
[1] = ieee80211_regdom
[1];
1725 REG_DBG_PRINT("Restoring regulatory settings\n");
1729 * Restoring regulatory settings involves ingoring any
1730 * possibly stale country IE information and user regulatory
1731 * settings if so desired, this includes any beacon hints
1732 * learned as we could have traveled outside to another country
1733 * after disconnection. To restore regulatory settings we do
1734 * exactly what we did at bootup:
1736 * - send a core regulatory hint
1737 * - send a user regulatory hint if applicable
1739 * Device drivers that send a regulatory hint for a specific country
1740 * keep their own regulatory domain on wiphy->regd so that does does
1741 * not need to be remembered.
1743 static void restore_regulatory_settings(bool reset_user
)
1746 struct reg_beacon
*reg_beacon
, *btmp
;
1748 mutex_lock(&cfg80211_mutex
);
1749 mutex_lock(®_mutex
);
1752 restore_alpha2(alpha2
, reset_user
);
1754 /* Clear beacon hints */
1755 spin_lock_bh(®_pending_beacons_lock
);
1756 if (!list_empty(®_pending_beacons
)) {
1757 list_for_each_entry_safe(reg_beacon
, btmp
,
1758 ®_pending_beacons
, list
) {
1759 list_del(®_beacon
->list
);
1763 spin_unlock_bh(®_pending_beacons_lock
);
1765 if (!list_empty(®_beacon_list
)) {
1766 list_for_each_entry_safe(reg_beacon
, btmp
,
1767 ®_beacon_list
, list
) {
1768 list_del(®_beacon
->list
);
1773 /* First restore to the basic regulatory settings */
1774 cfg80211_regdomain
= cfg80211_world_regdom
;
1776 mutex_unlock(®_mutex
);
1777 mutex_unlock(&cfg80211_mutex
);
1779 regulatory_hint_core(cfg80211_regdomain
->alpha2
);
1782 * This restores the ieee80211_regdom module parameter
1783 * preference or the last user requested regulatory
1784 * settings, user regulatory settings takes precedence.
1786 if (is_an_alpha2(alpha2
))
1787 regulatory_hint_user(user_alpha2
);
1791 void regulatory_hint_disconnect(void)
1793 REG_DBG_PRINT("All devices are disconnected, going to "
1794 "restore regulatory settings\n");
1795 restore_regulatory_settings(false);
1798 static bool freq_is_chan_12_13_14(u16 freq
)
1800 if (freq
== ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ
) ||
1801 freq
== ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ
) ||
1802 freq
== ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ
))
1807 int regulatory_hint_found_beacon(struct wiphy
*wiphy
,
1808 struct ieee80211_channel
*beacon_chan
,
1811 struct reg_beacon
*reg_beacon
;
1813 if (likely((beacon_chan
->beacon_found
||
1814 (beacon_chan
->flags
& IEEE80211_CHAN_RADAR
) ||
1815 (beacon_chan
->band
== IEEE80211_BAND_2GHZ
&&
1816 !freq_is_chan_12_13_14(beacon_chan
->center_freq
)))))
1819 reg_beacon
= kzalloc(sizeof(struct reg_beacon
), gfp
);
1823 REG_DBG_PRINT("Found new beacon on "
1824 "frequency: %d MHz (Ch %d) on %s\n",
1825 beacon_chan
->center_freq
,
1826 ieee80211_frequency_to_channel(beacon_chan
->center_freq
),
1829 memcpy(®_beacon
->chan
, beacon_chan
,
1830 sizeof(struct ieee80211_channel
));
1834 * Since we can be called from BH or and non-BH context
1835 * we must use spin_lock_bh()
1837 spin_lock_bh(®_pending_beacons_lock
);
1838 list_add_tail(®_beacon
->list
, ®_pending_beacons
);
1839 spin_unlock_bh(®_pending_beacons_lock
);
1841 schedule_work(®_work
);
1846 static void print_rd_rules(const struct ieee80211_regdomain
*rd
)
1849 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
1850 const struct ieee80211_freq_range
*freq_range
= NULL
;
1851 const struct ieee80211_power_rule
*power_rule
= NULL
;
1853 pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n");
1855 for (i
= 0; i
< rd
->n_reg_rules
; i
++) {
1856 reg_rule
= &rd
->reg_rules
[i
];
1857 freq_range
= ®_rule
->freq_range
;
1858 power_rule
= ®_rule
->power_rule
;
1861 * There may not be documentation for max antenna gain
1862 * in certain regions
1864 if (power_rule
->max_antenna_gain
)
1865 pr_info(" (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n",
1866 freq_range
->start_freq_khz
,
1867 freq_range
->end_freq_khz
,
1868 freq_range
->max_bandwidth_khz
,
1869 power_rule
->max_antenna_gain
,
1870 power_rule
->max_eirp
);
1872 pr_info(" (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n",
1873 freq_range
->start_freq_khz
,
1874 freq_range
->end_freq_khz
,
1875 freq_range
->max_bandwidth_khz
,
1876 power_rule
->max_eirp
);
1880 static void print_regdomain(const struct ieee80211_regdomain
*rd
)
1883 if (is_intersected_alpha2(rd
->alpha2
)) {
1885 if (last_request
->initiator
==
1886 NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
1887 struct cfg80211_registered_device
*rdev
;
1888 rdev
= cfg80211_rdev_by_wiphy_idx(
1889 last_request
->wiphy_idx
);
1891 pr_info("Current regulatory domain updated by AP to: %c%c\n",
1892 rdev
->country_ie_alpha2
[0],
1893 rdev
->country_ie_alpha2
[1]);
1895 pr_info("Current regulatory domain intersected:\n");
1897 pr_info("Current regulatory domain intersected:\n");
1898 } else if (is_world_regdom(rd
->alpha2
))
1899 pr_info("World regulatory domain updated:\n");
1901 if (is_unknown_alpha2(rd
->alpha2
))
1902 pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n");
1904 pr_info("Regulatory domain changed to country: %c%c\n",
1905 rd
->alpha2
[0], rd
->alpha2
[1]);
1910 static void print_regdomain_info(const struct ieee80211_regdomain
*rd
)
1912 pr_info("Regulatory domain: %c%c\n", rd
->alpha2
[0], rd
->alpha2
[1]);
1916 /* Takes ownership of rd only if it doesn't fail */
1917 static int __set_regdom(const struct ieee80211_regdomain
*rd
)
1919 const struct ieee80211_regdomain
*intersected_rd
= NULL
;
1920 struct cfg80211_registered_device
*rdev
= NULL
;
1921 struct wiphy
*request_wiphy
;
1922 /* Some basic sanity checks first */
1924 if (is_world_regdom(rd
->alpha2
)) {
1925 if (WARN_ON(!reg_is_valid_request(rd
->alpha2
)))
1927 update_world_regdomain(rd
);
1931 if (!is_alpha2_set(rd
->alpha2
) && !is_an_alpha2(rd
->alpha2
) &&
1932 !is_unknown_alpha2(rd
->alpha2
))
1939 * Lets only bother proceeding on the same alpha2 if the current
1940 * rd is non static (it means CRDA was present and was used last)
1941 * and the pending request came in from a country IE
1943 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
1945 * If someone else asked us to change the rd lets only bother
1946 * checking if the alpha2 changes if CRDA was already called
1948 if (!regdom_changes(rd
->alpha2
))
1953 * Now lets set the regulatory domain, update all driver channels
1954 * and finally inform them of what we have done, in case they want
1955 * to review or adjust their own settings based on their own
1956 * internal EEPROM data
1959 if (WARN_ON(!reg_is_valid_request(rd
->alpha2
)))
1962 if (!is_valid_rd(rd
)) {
1963 pr_err("Invalid regulatory domain detected:\n");
1964 print_regdomain_info(rd
);
1968 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
1970 if (!last_request
->intersect
) {
1973 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_DRIVER
) {
1975 cfg80211_regdomain
= rd
;
1980 * For a driver hint, lets copy the regulatory domain the
1981 * driver wanted to the wiphy to deal with conflicts
1985 * Userspace could have sent two replies with only
1986 * one kernel request.
1988 if (request_wiphy
->regd
)
1991 r
= reg_copy_regd(&request_wiphy
->regd
, rd
);
1996 cfg80211_regdomain
= rd
;
2000 /* Intersection requires a bit more work */
2002 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
2004 intersected_rd
= regdom_intersect(rd
, cfg80211_regdomain
);
2005 if (!intersected_rd
)
2009 * We can trash what CRDA provided now.
2010 * However if a driver requested this specific regulatory
2011 * domain we keep it for its private use
2013 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
)
2014 request_wiphy
->regd
= rd
;
2021 cfg80211_regdomain
= intersected_rd
;
2026 if (!intersected_rd
)
2029 rdev
= wiphy_to_dev(request_wiphy
);
2031 rdev
->country_ie_alpha2
[0] = rd
->alpha2
[0];
2032 rdev
->country_ie_alpha2
[1] = rd
->alpha2
[1];
2033 rdev
->env
= last_request
->country_ie_env
;
2035 BUG_ON(intersected_rd
== rd
);
2041 cfg80211_regdomain
= intersected_rd
;
2048 * Use this call to set the current regulatory domain. Conflicts with
2049 * multiple drivers can be ironed out later. Caller must've already
2050 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
2052 int set_regdom(const struct ieee80211_regdomain
*rd
)
2056 assert_cfg80211_lock();
2058 mutex_lock(®_mutex
);
2060 /* Note that this doesn't update the wiphys, this is done below */
2061 r
= __set_regdom(rd
);
2064 mutex_unlock(®_mutex
);
2068 /* This would make this whole thing pointless */
2069 if (!last_request
->intersect
)
2070 BUG_ON(rd
!= cfg80211_regdomain
);
2072 /* update all wiphys now with the new established regulatory domain */
2073 update_all_wiphy_regulatory(last_request
->initiator
);
2075 print_regdomain(cfg80211_regdomain
);
2077 nl80211_send_reg_change_event(last_request
);
2079 reg_set_request_processed();
2081 mutex_unlock(®_mutex
);
2086 #ifdef CONFIG_HOTPLUG
2087 int reg_device_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
2089 if (last_request
&& !last_request
->processed
) {
2090 if (add_uevent_var(env
, "COUNTRY=%c%c",
2091 last_request
->alpha2
[0],
2092 last_request
->alpha2
[1]))
2099 int reg_device_uevent(struct device
*dev
, struct kobj_uevent_env
*env
)
2103 #endif /* CONFIG_HOTPLUG */
2105 /* Caller must hold cfg80211_mutex */
2106 void reg_device_remove(struct wiphy
*wiphy
)
2108 struct wiphy
*request_wiphy
= NULL
;
2110 assert_cfg80211_lock();
2112 mutex_lock(®_mutex
);
2117 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
2119 if (!request_wiphy
|| request_wiphy
!= wiphy
)
2122 last_request
->wiphy_idx
= WIPHY_IDX_STALE
;
2123 last_request
->country_ie_env
= ENVIRON_ANY
;
2125 mutex_unlock(®_mutex
);
2128 int __init
regulatory_init(void)
2132 reg_pdev
= platform_device_register_simple("regulatory", 0, NULL
, 0);
2133 if (IS_ERR(reg_pdev
))
2134 return PTR_ERR(reg_pdev
);
2136 reg_pdev
->dev
.type
= ®_device_type
;
2138 spin_lock_init(®_requests_lock
);
2139 spin_lock_init(®_pending_beacons_lock
);
2141 cfg80211_regdomain
= cfg80211_world_regdom
;
2143 user_alpha2
[0] = '9';
2144 user_alpha2
[1] = '7';
2146 /* We always try to get an update for the static regdomain */
2147 err
= regulatory_hint_core(cfg80211_regdomain
->alpha2
);
2152 * N.B. kobject_uevent_env() can fail mainly for when we're out
2153 * memory which is handled and propagated appropriately above
2154 * but it can also fail during a netlink_broadcast() or during
2155 * early boot for call_usermodehelper(). For now treat these
2156 * errors as non-fatal.
2158 pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
2159 #ifdef CONFIG_CFG80211_REG_DEBUG
2160 /* We want to find out exactly why when debugging */
2166 * Finally, if the user set the module parameter treat it
2169 if (!is_world_regdom(ieee80211_regdom
))
2170 regulatory_hint_user(ieee80211_regdom
);
2175 void /* __init_or_exit */ regulatory_exit(void)
2177 struct regulatory_request
*reg_request
, *tmp
;
2178 struct reg_beacon
*reg_beacon
, *btmp
;
2180 cancel_work_sync(®_work
);
2182 mutex_lock(&cfg80211_mutex
);
2183 mutex_lock(®_mutex
);
2187 kfree(last_request
);
2189 platform_device_unregister(reg_pdev
);
2191 spin_lock_bh(®_pending_beacons_lock
);
2192 if (!list_empty(®_pending_beacons
)) {
2193 list_for_each_entry_safe(reg_beacon
, btmp
,
2194 ®_pending_beacons
, list
) {
2195 list_del(®_beacon
->list
);
2199 spin_unlock_bh(®_pending_beacons_lock
);
2201 if (!list_empty(®_beacon_list
)) {
2202 list_for_each_entry_safe(reg_beacon
, btmp
,
2203 ®_beacon_list
, list
) {
2204 list_del(®_beacon
->list
);
2209 spin_lock(®_requests_lock
);
2210 if (!list_empty(®_requests_list
)) {
2211 list_for_each_entry_safe(reg_request
, tmp
,
2212 ®_requests_list
, list
) {
2213 list_del(®_request
->list
);
2217 spin_unlock(®_requests_lock
);
2219 mutex_unlock(®_mutex
);
2220 mutex_unlock(&cfg80211_mutex
);