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.
35 #include <linux/kernel.h>
36 #include <linux/slab.h>
37 #include <linux/list.h>
38 #include <linux/random.h>
39 #include <linux/nl80211.h>
40 #include <linux/platform_device.h>
41 #include <net/cfg80211.h>
47 #ifdef CONFIG_CFG80211_REG_DEBUG
48 #define REG_DBG_PRINT(format, args...) \
50 printk(KERN_DEBUG format , ## args); \
53 #define REG_DBG_PRINT(args...)
56 /* Receipt of information from last regulatory request */
57 static struct regulatory_request
*last_request
;
59 /* To trigger userspace events */
60 static struct platform_device
*reg_pdev
;
63 * Central wireless core regulatory domains, we only need two,
64 * the current one and a world regulatory domain in case we have no
65 * information to give us an alpha2
67 const struct ieee80211_regdomain
*cfg80211_regdomain
;
70 * Protects static reg.c components:
71 * - cfg80211_world_regdom
75 static DEFINE_MUTEX(reg_mutex
);
76 #define assert_reg_lock() WARN_ON(!mutex_is_locked(®_mutex))
78 /* Used to queue up regulatory hints */
79 static LIST_HEAD(reg_requests_list
);
80 static spinlock_t reg_requests_lock
;
82 /* Used to queue up beacon hints for review */
83 static LIST_HEAD(reg_pending_beacons
);
84 static spinlock_t reg_pending_beacons_lock
;
86 /* Used to keep track of processed beacon hints */
87 static LIST_HEAD(reg_beacon_list
);
90 struct list_head list
;
91 struct ieee80211_channel chan
;
94 /* We keep a static world regulatory domain in case of the absence of CRDA */
95 static const struct ieee80211_regdomain world_regdom
= {
99 /* IEEE 802.11b/g, channels 1..11 */
100 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
101 /* IEEE 802.11b/g, channels 12..13. No HT40
102 * channel fits here. */
103 REG_RULE(2467-10, 2472+10, 20, 6, 20,
104 NL80211_RRF_PASSIVE_SCAN
|
105 NL80211_RRF_NO_IBSS
),
106 /* IEEE 802.11 channel 14 - Only JP enables
107 * this and for 802.11b only */
108 REG_RULE(2484-10, 2484+10, 20, 6, 20,
109 NL80211_RRF_PASSIVE_SCAN
|
110 NL80211_RRF_NO_IBSS
|
111 NL80211_RRF_NO_OFDM
),
112 /* IEEE 802.11a, channel 36..48 */
113 REG_RULE(5180-10, 5240+10, 40, 6, 20,
114 NL80211_RRF_PASSIVE_SCAN
|
115 NL80211_RRF_NO_IBSS
),
117 /* NB: 5260 MHz - 5700 MHz requies DFS */
119 /* IEEE 802.11a, channel 149..165 */
120 REG_RULE(5745-10, 5825+10, 40, 6, 20,
121 NL80211_RRF_PASSIVE_SCAN
|
122 NL80211_RRF_NO_IBSS
),
126 static const struct ieee80211_regdomain
*cfg80211_world_regdom
=
129 static char *ieee80211_regdom
= "00";
130 static char user_alpha2
[2];
132 module_param(ieee80211_regdom
, charp
, 0444);
133 MODULE_PARM_DESC(ieee80211_regdom
, "IEEE 802.11 regulatory domain code");
135 static void reset_regdomains(void)
137 /* avoid freeing static information or freeing something twice */
138 if (cfg80211_regdomain
== cfg80211_world_regdom
)
139 cfg80211_regdomain
= NULL
;
140 if (cfg80211_world_regdom
== &world_regdom
)
141 cfg80211_world_regdom
= NULL
;
142 if (cfg80211_regdomain
== &world_regdom
)
143 cfg80211_regdomain
= NULL
;
145 kfree(cfg80211_regdomain
);
146 kfree(cfg80211_world_regdom
);
148 cfg80211_world_regdom
= &world_regdom
;
149 cfg80211_regdomain
= NULL
;
153 * Dynamic world regulatory domain requested by the wireless
154 * core upon initialization
156 static void update_world_regdomain(const struct ieee80211_regdomain
*rd
)
158 BUG_ON(!last_request
);
162 cfg80211_world_regdom
= rd
;
163 cfg80211_regdomain
= rd
;
166 bool is_world_regdom(const char *alpha2
)
170 if (alpha2
[0] == '0' && alpha2
[1] == '0')
175 static bool is_alpha2_set(const char *alpha2
)
179 if (alpha2
[0] != 0 && alpha2
[1] != 0)
184 static bool is_alpha_upper(char letter
)
187 if (letter
>= 65 && letter
<= 90)
192 static bool is_unknown_alpha2(const char *alpha2
)
197 * Special case where regulatory domain was built by driver
198 * but a specific alpha2 cannot be determined
200 if (alpha2
[0] == '9' && alpha2
[1] == '9')
205 static bool is_intersected_alpha2(const char *alpha2
)
210 * Special case where regulatory domain is the
211 * result of an intersection between two regulatory domain
214 if (alpha2
[0] == '9' && alpha2
[1] == '8')
219 static bool is_an_alpha2(const char *alpha2
)
223 if (is_alpha_upper(alpha2
[0]) && is_alpha_upper(alpha2
[1]))
228 static bool alpha2_equal(const char *alpha2_x
, const char *alpha2_y
)
230 if (!alpha2_x
|| !alpha2_y
)
232 if (alpha2_x
[0] == alpha2_y
[0] &&
233 alpha2_x
[1] == alpha2_y
[1])
238 static bool regdom_changes(const char *alpha2
)
240 assert_cfg80211_lock();
242 if (!cfg80211_regdomain
)
244 if (alpha2_equal(cfg80211_regdomain
->alpha2
, alpha2
))
250 * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
251 * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
252 * has ever been issued.
254 static bool is_user_regdom_saved(void)
256 if (user_alpha2
[0] == '9' && user_alpha2
[1] == '7')
259 /* This would indicate a mistake on the design */
260 if (WARN((!is_world_regdom(user_alpha2
) &&
261 !is_an_alpha2(user_alpha2
)),
262 "Unexpected user alpha2: %c%c\n",
270 static int reg_copy_regd(const struct ieee80211_regdomain
**dst_regd
,
271 const struct ieee80211_regdomain
*src_regd
)
273 struct ieee80211_regdomain
*regd
;
274 int size_of_regd
= 0;
277 size_of_regd
= sizeof(struct ieee80211_regdomain
) +
278 ((src_regd
->n_reg_rules
+ 1) * sizeof(struct ieee80211_reg_rule
));
280 regd
= kzalloc(size_of_regd
, GFP_KERNEL
);
284 memcpy(regd
, src_regd
, sizeof(struct ieee80211_regdomain
));
286 for (i
= 0; i
< src_regd
->n_reg_rules
; i
++)
287 memcpy(®d
->reg_rules
[i
], &src_regd
->reg_rules
[i
],
288 sizeof(struct ieee80211_reg_rule
));
294 #ifdef CONFIG_CFG80211_INTERNAL_REGDB
295 struct reg_regdb_search_request
{
297 struct list_head list
;
300 static LIST_HEAD(reg_regdb_search_list
);
301 static DEFINE_MUTEX(reg_regdb_search_mutex
);
303 static void reg_regdb_search(struct work_struct
*work
)
305 struct reg_regdb_search_request
*request
;
306 const struct ieee80211_regdomain
*curdom
, *regdom
;
309 mutex_lock(®_regdb_search_mutex
);
310 while (!list_empty(®_regdb_search_list
)) {
311 request
= list_first_entry(®_regdb_search_list
,
312 struct reg_regdb_search_request
,
314 list_del(&request
->list
);
316 for (i
=0; i
<reg_regdb_size
; i
++) {
317 curdom
= reg_regdb
[i
];
319 if (!memcmp(request
->alpha2
, curdom
->alpha2
, 2)) {
320 r
= reg_copy_regd(®dom
, curdom
);
323 mutex_lock(&cfg80211_mutex
);
325 mutex_unlock(&cfg80211_mutex
);
332 mutex_unlock(®_regdb_search_mutex
);
335 static DECLARE_WORK(reg_regdb_work
, reg_regdb_search
);
337 static void reg_regdb_query(const char *alpha2
)
339 struct reg_regdb_search_request
*request
;
344 request
= kzalloc(sizeof(struct reg_regdb_search_request
), GFP_KERNEL
);
348 memcpy(request
->alpha2
, alpha2
, 2);
350 mutex_lock(®_regdb_search_mutex
);
351 list_add_tail(&request
->list
, ®_regdb_search_list
);
352 mutex_unlock(®_regdb_search_mutex
);
354 schedule_work(®_regdb_work
);
357 static inline void reg_regdb_query(const char *alpha2
) {}
358 #endif /* CONFIG_CFG80211_INTERNAL_REGDB */
361 * This lets us keep regulatory code which is updated on a regulatory
362 * basis in userspace.
364 static int call_crda(const char *alpha2
)
366 char country_env
[9 + 2] = "COUNTRY=";
372 if (!is_world_regdom((char *) alpha2
))
373 printk(KERN_INFO
"cfg80211: Calling CRDA for country: %c%c\n",
374 alpha2
[0], alpha2
[1]);
376 printk(KERN_INFO
"cfg80211: Calling CRDA to update world "
377 "regulatory domain\n");
379 /* query internal regulatory database (if it exists) */
380 reg_regdb_query(alpha2
);
382 country_env
[8] = alpha2
[0];
383 country_env
[9] = alpha2
[1];
385 return kobject_uevent_env(®_pdev
->dev
.kobj
, KOBJ_CHANGE
, envp
);
388 /* Used by nl80211 before kmalloc'ing our regulatory domain */
389 bool reg_is_valid_request(const char *alpha2
)
391 assert_cfg80211_lock();
396 return alpha2_equal(last_request
->alpha2
, alpha2
);
399 /* Sanity check on a regulatory rule */
400 static bool is_valid_reg_rule(const struct ieee80211_reg_rule
*rule
)
402 const struct ieee80211_freq_range
*freq_range
= &rule
->freq_range
;
405 if (freq_range
->start_freq_khz
<= 0 || freq_range
->end_freq_khz
<= 0)
408 if (freq_range
->start_freq_khz
> freq_range
->end_freq_khz
)
411 freq_diff
= freq_range
->end_freq_khz
- freq_range
->start_freq_khz
;
413 if (freq_range
->end_freq_khz
<= freq_range
->start_freq_khz
||
414 freq_range
->max_bandwidth_khz
> freq_diff
)
420 static bool is_valid_rd(const struct ieee80211_regdomain
*rd
)
422 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
425 if (!rd
->n_reg_rules
)
428 if (WARN_ON(rd
->n_reg_rules
> NL80211_MAX_SUPP_REG_RULES
))
431 for (i
= 0; i
< rd
->n_reg_rules
; i
++) {
432 reg_rule
= &rd
->reg_rules
[i
];
433 if (!is_valid_reg_rule(reg_rule
))
440 static bool reg_does_bw_fit(const struct ieee80211_freq_range
*freq_range
,
444 u32 start_freq_khz
, end_freq_khz
;
446 start_freq_khz
= center_freq_khz
- (bw_khz
/2);
447 end_freq_khz
= center_freq_khz
+ (bw_khz
/2);
449 if (start_freq_khz
>= freq_range
->start_freq_khz
&&
450 end_freq_khz
<= freq_range
->end_freq_khz
)
457 * freq_in_rule_band - tells us if a frequency is in a frequency band
458 * @freq_range: frequency rule we want to query
459 * @freq_khz: frequency we are inquiring about
461 * This lets us know if a specific frequency rule is or is not relevant to
462 * a specific frequency's band. Bands are device specific and artificial
463 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
464 * safe for now to assume that a frequency rule should not be part of a
465 * frequency's band if the start freq or end freq are off by more than 2 GHz.
466 * This resolution can be lowered and should be considered as we add
467 * regulatory rule support for other "bands".
469 static bool freq_in_rule_band(const struct ieee80211_freq_range
*freq_range
,
472 #define ONE_GHZ_IN_KHZ 1000000
473 if (abs(freq_khz
- freq_range
->start_freq_khz
) <= (2 * ONE_GHZ_IN_KHZ
))
475 if (abs(freq_khz
- freq_range
->end_freq_khz
) <= (2 * ONE_GHZ_IN_KHZ
))
478 #undef ONE_GHZ_IN_KHZ
482 * Helper for regdom_intersect(), this does the real
483 * mathematical intersection fun
485 static int reg_rules_intersect(
486 const struct ieee80211_reg_rule
*rule1
,
487 const struct ieee80211_reg_rule
*rule2
,
488 struct ieee80211_reg_rule
*intersected_rule
)
490 const struct ieee80211_freq_range
*freq_range1
, *freq_range2
;
491 struct ieee80211_freq_range
*freq_range
;
492 const struct ieee80211_power_rule
*power_rule1
, *power_rule2
;
493 struct ieee80211_power_rule
*power_rule
;
496 freq_range1
= &rule1
->freq_range
;
497 freq_range2
= &rule2
->freq_range
;
498 freq_range
= &intersected_rule
->freq_range
;
500 power_rule1
= &rule1
->power_rule
;
501 power_rule2
= &rule2
->power_rule
;
502 power_rule
= &intersected_rule
->power_rule
;
504 freq_range
->start_freq_khz
= max(freq_range1
->start_freq_khz
,
505 freq_range2
->start_freq_khz
);
506 freq_range
->end_freq_khz
= min(freq_range1
->end_freq_khz
,
507 freq_range2
->end_freq_khz
);
508 freq_range
->max_bandwidth_khz
= min(freq_range1
->max_bandwidth_khz
,
509 freq_range2
->max_bandwidth_khz
);
511 freq_diff
= freq_range
->end_freq_khz
- freq_range
->start_freq_khz
;
512 if (freq_range
->max_bandwidth_khz
> freq_diff
)
513 freq_range
->max_bandwidth_khz
= freq_diff
;
515 power_rule
->max_eirp
= min(power_rule1
->max_eirp
,
516 power_rule2
->max_eirp
);
517 power_rule
->max_antenna_gain
= min(power_rule1
->max_antenna_gain
,
518 power_rule2
->max_antenna_gain
);
520 intersected_rule
->flags
= (rule1
->flags
| rule2
->flags
);
522 if (!is_valid_reg_rule(intersected_rule
))
529 * regdom_intersect - do the intersection between two regulatory domains
530 * @rd1: first regulatory domain
531 * @rd2: second regulatory domain
533 * Use this function to get the intersection between two regulatory domains.
534 * Once completed we will mark the alpha2 for the rd as intersected, "98",
535 * as no one single alpha2 can represent this regulatory domain.
537 * Returns a pointer to the regulatory domain structure which will hold the
538 * resulting intersection of rules between rd1 and rd2. We will
539 * kzalloc() this structure for you.
541 static struct ieee80211_regdomain
*regdom_intersect(
542 const struct ieee80211_regdomain
*rd1
,
543 const struct ieee80211_regdomain
*rd2
)
547 unsigned int num_rules
= 0, rule_idx
= 0;
548 const struct ieee80211_reg_rule
*rule1
, *rule2
;
549 struct ieee80211_reg_rule
*intersected_rule
;
550 struct ieee80211_regdomain
*rd
;
551 /* This is just a dummy holder to help us count */
552 struct ieee80211_reg_rule irule
;
554 /* Uses the stack temporarily for counter arithmetic */
555 intersected_rule
= &irule
;
557 memset(intersected_rule
, 0, sizeof(struct ieee80211_reg_rule
));
563 * First we get a count of the rules we'll need, then we actually
564 * build them. This is to so we can malloc() and free() a
565 * regdomain once. The reason we use reg_rules_intersect() here
566 * is it will return -EINVAL if the rule computed makes no sense.
567 * All rules that do check out OK are valid.
570 for (x
= 0; x
< rd1
->n_reg_rules
; x
++) {
571 rule1
= &rd1
->reg_rules
[x
];
572 for (y
= 0; y
< rd2
->n_reg_rules
; y
++) {
573 rule2
= &rd2
->reg_rules
[y
];
574 if (!reg_rules_intersect(rule1
, rule2
,
577 memset(intersected_rule
, 0,
578 sizeof(struct ieee80211_reg_rule
));
585 size_of_regd
= sizeof(struct ieee80211_regdomain
) +
586 ((num_rules
+ 1) * sizeof(struct ieee80211_reg_rule
));
588 rd
= kzalloc(size_of_regd
, GFP_KERNEL
);
592 for (x
= 0; x
< rd1
->n_reg_rules
; x
++) {
593 rule1
= &rd1
->reg_rules
[x
];
594 for (y
= 0; y
< rd2
->n_reg_rules
; y
++) {
595 rule2
= &rd2
->reg_rules
[y
];
597 * This time around instead of using the stack lets
598 * write to the target rule directly saving ourselves
601 intersected_rule
= &rd
->reg_rules
[rule_idx
];
602 r
= reg_rules_intersect(rule1
, rule2
,
605 * No need to memset here the intersected rule here as
606 * we're not using the stack anymore
614 if (rule_idx
!= num_rules
) {
619 rd
->n_reg_rules
= num_rules
;
626 static u32
map_regdom_flags(u32 rd_flags
)
628 u32 channel_flags
= 0;
629 if (rd_flags
& NL80211_RRF_PASSIVE_SCAN
)
630 channel_flags
|= IEEE80211_CHAN_PASSIVE_SCAN
;
631 if (rd_flags
& NL80211_RRF_NO_IBSS
)
632 channel_flags
|= IEEE80211_CHAN_NO_IBSS
;
633 if (rd_flags
& NL80211_RRF_DFS
)
634 channel_flags
|= IEEE80211_CHAN_RADAR
;
635 return channel_flags
;
638 static int freq_reg_info_regd(struct wiphy
*wiphy
,
641 const struct ieee80211_reg_rule
**reg_rule
,
642 const struct ieee80211_regdomain
*custom_regd
)
645 bool band_rule_found
= false;
646 const struct ieee80211_regdomain
*regd
;
647 bool bw_fits
= false;
650 desired_bw_khz
= MHZ_TO_KHZ(20);
652 regd
= custom_regd
? custom_regd
: cfg80211_regdomain
;
655 * Follow the driver's regulatory domain, if present, unless a country
656 * IE has been processed or a user wants to help complaince further
658 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
659 last_request
->initiator
!= NL80211_REGDOM_SET_BY_USER
&&
666 for (i
= 0; i
< regd
->n_reg_rules
; i
++) {
667 const struct ieee80211_reg_rule
*rr
;
668 const struct ieee80211_freq_range
*fr
= NULL
;
669 const struct ieee80211_power_rule
*pr
= NULL
;
671 rr
= ®d
->reg_rules
[i
];
672 fr
= &rr
->freq_range
;
673 pr
= &rr
->power_rule
;
676 * We only need to know if one frequency rule was
677 * was in center_freq's band, that's enough, so lets
678 * not overwrite it once found
680 if (!band_rule_found
)
681 band_rule_found
= freq_in_rule_band(fr
, center_freq
);
683 bw_fits
= reg_does_bw_fit(fr
,
687 if (band_rule_found
&& bw_fits
) {
693 if (!band_rule_found
)
699 int freq_reg_info(struct wiphy
*wiphy
,
702 const struct ieee80211_reg_rule
**reg_rule
)
704 assert_cfg80211_lock();
705 return freq_reg_info_regd(wiphy
,
711 EXPORT_SYMBOL(freq_reg_info
);
714 * Note that right now we assume the desired channel bandwidth
715 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
716 * per channel, the primary and the extension channel). To support
717 * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a
718 * new ieee80211_channel.target_bw and re run the regulatory check
719 * on the wiphy with the target_bw specified. Then we can simply use
720 * that below for the desired_bw_khz below.
722 static void handle_channel(struct wiphy
*wiphy
,
723 enum nl80211_reg_initiator initiator
,
724 enum ieee80211_band band
,
725 unsigned int chan_idx
)
728 u32 flags
, bw_flags
= 0;
729 u32 desired_bw_khz
= MHZ_TO_KHZ(20);
730 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
731 const struct ieee80211_power_rule
*power_rule
= NULL
;
732 const struct ieee80211_freq_range
*freq_range
= NULL
;
733 struct ieee80211_supported_band
*sband
;
734 struct ieee80211_channel
*chan
;
735 struct wiphy
*request_wiphy
= NULL
;
737 assert_cfg80211_lock();
739 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
741 sband
= wiphy
->bands
[band
];
742 BUG_ON(chan_idx
>= sband
->n_channels
);
743 chan
= &sband
->channels
[chan_idx
];
745 flags
= chan
->orig_flags
;
747 r
= freq_reg_info(wiphy
,
748 MHZ_TO_KHZ(chan
->center_freq
),
755 power_rule
= ®_rule
->power_rule
;
756 freq_range
= ®_rule
->freq_range
;
758 if (freq_range
->max_bandwidth_khz
< MHZ_TO_KHZ(40))
759 bw_flags
= IEEE80211_CHAN_NO_HT40
;
761 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
&&
762 request_wiphy
&& request_wiphy
== wiphy
&&
763 request_wiphy
->flags
& WIPHY_FLAG_STRICT_REGULATORY
) {
765 * This gaurantees the driver's requested regulatory domain
766 * will always be used as a base for further regulatory
769 chan
->flags
= chan
->orig_flags
=
770 map_regdom_flags(reg_rule
->flags
) | bw_flags
;
771 chan
->max_antenna_gain
= chan
->orig_mag
=
772 (int) MBI_TO_DBI(power_rule
->max_antenna_gain
);
773 chan
->max_power
= chan
->orig_mpwr
=
774 (int) MBM_TO_DBM(power_rule
->max_eirp
);
778 chan
->flags
= flags
| bw_flags
| map_regdom_flags(reg_rule
->flags
);
779 chan
->max_antenna_gain
= min(chan
->orig_mag
,
780 (int) MBI_TO_DBI(power_rule
->max_antenna_gain
));
782 chan
->max_power
= min(chan
->orig_mpwr
,
783 (int) MBM_TO_DBM(power_rule
->max_eirp
));
785 chan
->max_power
= (int) MBM_TO_DBM(power_rule
->max_eirp
);
788 static void handle_band(struct wiphy
*wiphy
,
789 enum ieee80211_band band
,
790 enum nl80211_reg_initiator initiator
)
793 struct ieee80211_supported_band
*sband
;
795 BUG_ON(!wiphy
->bands
[band
]);
796 sband
= wiphy
->bands
[band
];
798 for (i
= 0; i
< sband
->n_channels
; i
++)
799 handle_channel(wiphy
, initiator
, band
, i
);
802 static bool ignore_reg_update(struct wiphy
*wiphy
,
803 enum nl80211_reg_initiator initiator
)
807 if (initiator
== NL80211_REGDOM_SET_BY_CORE
&&
808 wiphy
->flags
& WIPHY_FLAG_CUSTOM_REGULATORY
)
811 * wiphy->regd will be set once the device has its own
812 * desired regulatory domain set
814 if (wiphy
->flags
& WIPHY_FLAG_STRICT_REGULATORY
&& !wiphy
->regd
&&
815 initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
816 !is_world_regdom(last_request
->alpha2
))
821 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator
)
823 struct cfg80211_registered_device
*rdev
;
825 list_for_each_entry(rdev
, &cfg80211_rdev_list
, list
)
826 wiphy_update_regulatory(&rdev
->wiphy
, initiator
);
829 static void handle_reg_beacon(struct wiphy
*wiphy
,
830 unsigned int chan_idx
,
831 struct reg_beacon
*reg_beacon
)
833 struct ieee80211_supported_band
*sband
;
834 struct ieee80211_channel
*chan
;
835 bool channel_changed
= false;
836 struct ieee80211_channel chan_before
;
838 assert_cfg80211_lock();
840 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
841 chan
= &sband
->channels
[chan_idx
];
843 if (likely(chan
->center_freq
!= reg_beacon
->chan
.center_freq
))
846 if (chan
->beacon_found
)
849 chan
->beacon_found
= true;
851 if (wiphy
->flags
& WIPHY_FLAG_DISABLE_BEACON_HINTS
)
854 chan_before
.center_freq
= chan
->center_freq
;
855 chan_before
.flags
= chan
->flags
;
857 if (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
) {
858 chan
->flags
&= ~IEEE80211_CHAN_PASSIVE_SCAN
;
859 channel_changed
= true;
862 if (chan
->flags
& IEEE80211_CHAN_NO_IBSS
) {
863 chan
->flags
&= ~IEEE80211_CHAN_NO_IBSS
;
864 channel_changed
= true;
868 nl80211_send_beacon_hint_event(wiphy
, &chan_before
, chan
);
872 * Called when a scan on a wiphy finds a beacon on
875 static void wiphy_update_new_beacon(struct wiphy
*wiphy
,
876 struct reg_beacon
*reg_beacon
)
879 struct ieee80211_supported_band
*sband
;
881 assert_cfg80211_lock();
883 if (!wiphy
->bands
[reg_beacon
->chan
.band
])
886 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
888 for (i
= 0; i
< sband
->n_channels
; i
++)
889 handle_reg_beacon(wiphy
, i
, reg_beacon
);
893 * Called upon reg changes or a new wiphy is added
895 static void wiphy_update_beacon_reg(struct wiphy
*wiphy
)
898 struct ieee80211_supported_band
*sband
;
899 struct reg_beacon
*reg_beacon
;
901 assert_cfg80211_lock();
903 if (list_empty(®_beacon_list
))
906 list_for_each_entry(reg_beacon
, ®_beacon_list
, list
) {
907 if (!wiphy
->bands
[reg_beacon
->chan
.band
])
909 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
910 for (i
= 0; i
< sband
->n_channels
; i
++)
911 handle_reg_beacon(wiphy
, i
, reg_beacon
);
915 static bool reg_is_world_roaming(struct wiphy
*wiphy
)
917 if (is_world_regdom(cfg80211_regdomain
->alpha2
) ||
918 (wiphy
->regd
&& is_world_regdom(wiphy
->regd
->alpha2
)))
921 last_request
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
922 wiphy
->flags
& WIPHY_FLAG_CUSTOM_REGULATORY
)
927 /* Reap the advantages of previously found beacons */
928 static void reg_process_beacons(struct wiphy
*wiphy
)
931 * Means we are just firing up cfg80211, so no beacons would
932 * have been processed yet.
936 if (!reg_is_world_roaming(wiphy
))
938 wiphy_update_beacon_reg(wiphy
);
941 static bool is_ht40_not_allowed(struct ieee80211_channel
*chan
)
945 if (chan
->flags
& IEEE80211_CHAN_DISABLED
)
947 /* This would happen when regulatory rules disallow HT40 completely */
948 if (IEEE80211_CHAN_NO_HT40
== (chan
->flags
& (IEEE80211_CHAN_NO_HT40
)))
953 static void reg_process_ht_flags_channel(struct wiphy
*wiphy
,
954 enum ieee80211_band band
,
955 unsigned int chan_idx
)
957 struct ieee80211_supported_band
*sband
;
958 struct ieee80211_channel
*channel
;
959 struct ieee80211_channel
*channel_before
= NULL
, *channel_after
= NULL
;
962 assert_cfg80211_lock();
964 sband
= wiphy
->bands
[band
];
965 BUG_ON(chan_idx
>= sband
->n_channels
);
966 channel
= &sband
->channels
[chan_idx
];
968 if (is_ht40_not_allowed(channel
)) {
969 channel
->flags
|= IEEE80211_CHAN_NO_HT40
;
974 * We need to ensure the extension channels exist to
975 * be able to use HT40- or HT40+, this finds them (or not)
977 for (i
= 0; i
< sband
->n_channels
; i
++) {
978 struct ieee80211_channel
*c
= &sband
->channels
[i
];
979 if (c
->center_freq
== (channel
->center_freq
- 20))
981 if (c
->center_freq
== (channel
->center_freq
+ 20))
986 * Please note that this assumes target bandwidth is 20 MHz,
987 * if that ever changes we also need to change the below logic
988 * to include that as well.
990 if (is_ht40_not_allowed(channel_before
))
991 channel
->flags
|= IEEE80211_CHAN_NO_HT40MINUS
;
993 channel
->flags
&= ~IEEE80211_CHAN_NO_HT40MINUS
;
995 if (is_ht40_not_allowed(channel_after
))
996 channel
->flags
|= IEEE80211_CHAN_NO_HT40PLUS
;
998 channel
->flags
&= ~IEEE80211_CHAN_NO_HT40PLUS
;
1001 static void reg_process_ht_flags_band(struct wiphy
*wiphy
,
1002 enum ieee80211_band band
)
1005 struct ieee80211_supported_band
*sband
;
1007 BUG_ON(!wiphy
->bands
[band
]);
1008 sband
= wiphy
->bands
[band
];
1010 for (i
= 0; i
< sband
->n_channels
; i
++)
1011 reg_process_ht_flags_channel(wiphy
, band
, i
);
1014 static void reg_process_ht_flags(struct wiphy
*wiphy
)
1016 enum ieee80211_band band
;
1021 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
1022 if (wiphy
->bands
[band
])
1023 reg_process_ht_flags_band(wiphy
, band
);
1028 void wiphy_update_regulatory(struct wiphy
*wiphy
,
1029 enum nl80211_reg_initiator initiator
)
1031 enum ieee80211_band band
;
1033 if (ignore_reg_update(wiphy
, initiator
))
1035 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
1036 if (wiphy
->bands
[band
])
1037 handle_band(wiphy
, band
, initiator
);
1040 reg_process_beacons(wiphy
);
1041 reg_process_ht_flags(wiphy
);
1042 if (wiphy
->reg_notifier
)
1043 wiphy
->reg_notifier(wiphy
, last_request
);
1046 static void handle_channel_custom(struct wiphy
*wiphy
,
1047 enum ieee80211_band band
,
1048 unsigned int chan_idx
,
1049 const struct ieee80211_regdomain
*regd
)
1052 u32 desired_bw_khz
= MHZ_TO_KHZ(20);
1054 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
1055 const struct ieee80211_power_rule
*power_rule
= NULL
;
1056 const struct ieee80211_freq_range
*freq_range
= NULL
;
1057 struct ieee80211_supported_band
*sband
;
1058 struct ieee80211_channel
*chan
;
1062 sband
= wiphy
->bands
[band
];
1063 BUG_ON(chan_idx
>= sband
->n_channels
);
1064 chan
= &sband
->channels
[chan_idx
];
1066 r
= freq_reg_info_regd(wiphy
,
1067 MHZ_TO_KHZ(chan
->center_freq
),
1073 chan
->flags
= IEEE80211_CHAN_DISABLED
;
1077 power_rule
= ®_rule
->power_rule
;
1078 freq_range
= ®_rule
->freq_range
;
1080 if (freq_range
->max_bandwidth_khz
< MHZ_TO_KHZ(40))
1081 bw_flags
= IEEE80211_CHAN_NO_HT40
;
1083 chan
->flags
|= map_regdom_flags(reg_rule
->flags
) | bw_flags
;
1084 chan
->max_antenna_gain
= (int) MBI_TO_DBI(power_rule
->max_antenna_gain
);
1085 chan
->max_power
= (int) MBM_TO_DBM(power_rule
->max_eirp
);
1088 static void handle_band_custom(struct wiphy
*wiphy
, enum ieee80211_band band
,
1089 const struct ieee80211_regdomain
*regd
)
1092 struct ieee80211_supported_band
*sband
;
1094 BUG_ON(!wiphy
->bands
[band
]);
1095 sband
= wiphy
->bands
[band
];
1097 for (i
= 0; i
< sband
->n_channels
; i
++)
1098 handle_channel_custom(wiphy
, band
, i
, regd
);
1101 /* Used by drivers prior to wiphy registration */
1102 void wiphy_apply_custom_regulatory(struct wiphy
*wiphy
,
1103 const struct ieee80211_regdomain
*regd
)
1105 enum ieee80211_band band
;
1106 unsigned int bands_set
= 0;
1108 mutex_lock(®_mutex
);
1109 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
1110 if (!wiphy
->bands
[band
])
1112 handle_band_custom(wiphy
, band
, regd
);
1115 mutex_unlock(®_mutex
);
1118 * no point in calling this if it won't have any effect
1119 * on your device's supportd bands.
1121 WARN_ON(!bands_set
);
1123 EXPORT_SYMBOL(wiphy_apply_custom_regulatory
);
1126 * Return value which can be used by ignore_request() to indicate
1127 * it has been determined we should intersect two regulatory domains
1129 #define REG_INTERSECT 1
1131 /* This has the logic which determines when a new request
1132 * should be ignored. */
1133 static int ignore_request(struct wiphy
*wiphy
,
1134 struct regulatory_request
*pending_request
)
1136 struct wiphy
*last_wiphy
= NULL
;
1138 assert_cfg80211_lock();
1140 /* All initial requests are respected */
1144 switch (pending_request
->initiator
) {
1145 case NL80211_REGDOM_SET_BY_CORE
:
1147 case NL80211_REGDOM_SET_BY_COUNTRY_IE
:
1149 last_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
1151 if (unlikely(!is_an_alpha2(pending_request
->alpha2
)))
1153 if (last_request
->initiator
==
1154 NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
1155 if (last_wiphy
!= wiphy
) {
1157 * Two cards with two APs claiming different
1158 * Country IE alpha2s. We could
1159 * intersect them, but that seems unlikely
1160 * to be correct. Reject second one for now.
1162 if (regdom_changes(pending_request
->alpha2
))
1167 * Two consecutive Country IE hints on the same wiphy.
1168 * This should be picked up early by the driver/stack
1170 if (WARN_ON(regdom_changes(pending_request
->alpha2
)))
1175 case NL80211_REGDOM_SET_BY_DRIVER
:
1176 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_CORE
) {
1177 if (regdom_changes(pending_request
->alpha2
))
1183 * This would happen if you unplug and plug your card
1184 * back in or if you add a new device for which the previously
1185 * loaded card also agrees on the regulatory domain.
1187 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
&&
1188 !regdom_changes(pending_request
->alpha2
))
1191 return REG_INTERSECT
;
1192 case NL80211_REGDOM_SET_BY_USER
:
1193 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_COUNTRY_IE
)
1194 return REG_INTERSECT
;
1196 * If the user knows better the user should set the regdom
1197 * to their country before the IE is picked up
1199 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_USER
&&
1200 last_request
->intersect
)
1203 * Process user requests only after previous user/driver/core
1204 * requests have been processed
1206 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_CORE
||
1207 last_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
||
1208 last_request
->initiator
== NL80211_REGDOM_SET_BY_USER
) {
1209 if (regdom_changes(last_request
->alpha2
))
1213 if (!regdom_changes(pending_request
->alpha2
))
1223 * __regulatory_hint - hint to the wireless core a regulatory domain
1224 * @wiphy: if the hint comes from country information from an AP, this
1225 * is required to be set to the wiphy that received the information
1226 * @pending_request: the regulatory request currently being processed
1228 * The Wireless subsystem can use this function to hint to the wireless core
1229 * what it believes should be the current regulatory domain.
1231 * Returns zero if all went fine, %-EALREADY if a regulatory domain had
1232 * already been set or other standard error codes.
1234 * Caller must hold &cfg80211_mutex and ®_mutex
1236 static int __regulatory_hint(struct wiphy
*wiphy
,
1237 struct regulatory_request
*pending_request
)
1239 bool intersect
= false;
1242 assert_cfg80211_lock();
1244 r
= ignore_request(wiphy
, pending_request
);
1246 if (r
== REG_INTERSECT
) {
1247 if (pending_request
->initiator
==
1248 NL80211_REGDOM_SET_BY_DRIVER
) {
1249 r
= reg_copy_regd(&wiphy
->regd
, cfg80211_regdomain
);
1251 kfree(pending_request
);
1258 * If the regulatory domain being requested by the
1259 * driver has already been set just copy it to the
1262 if (r
== -EALREADY
&&
1263 pending_request
->initiator
==
1264 NL80211_REGDOM_SET_BY_DRIVER
) {
1265 r
= reg_copy_regd(&wiphy
->regd
, cfg80211_regdomain
);
1267 kfree(pending_request
);
1273 kfree(pending_request
);
1278 kfree(last_request
);
1280 last_request
= pending_request
;
1281 last_request
->intersect
= intersect
;
1283 pending_request
= NULL
;
1285 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_USER
) {
1286 user_alpha2
[0] = last_request
->alpha2
[0];
1287 user_alpha2
[1] = last_request
->alpha2
[1];
1290 /* When r == REG_INTERSECT we do need to call CRDA */
1293 * Since CRDA will not be called in this case as we already
1294 * have applied the requested regulatory domain before we just
1295 * inform userspace we have processed the request
1298 nl80211_send_reg_change_event(last_request
);
1302 return call_crda(last_request
->alpha2
);
1305 /* This processes *all* regulatory hints */
1306 static void reg_process_hint(struct regulatory_request
*reg_request
)
1309 struct wiphy
*wiphy
= NULL
;
1310 enum nl80211_reg_initiator initiator
= reg_request
->initiator
;
1312 BUG_ON(!reg_request
->alpha2
);
1314 mutex_lock(&cfg80211_mutex
);
1315 mutex_lock(®_mutex
);
1317 if (wiphy_idx_valid(reg_request
->wiphy_idx
))
1318 wiphy
= wiphy_idx_to_wiphy(reg_request
->wiphy_idx
);
1320 if (reg_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
&&
1326 r
= __regulatory_hint(wiphy
, reg_request
);
1327 /* This is required so that the orig_* parameters are saved */
1328 if (r
== -EALREADY
&& wiphy
&&
1329 wiphy
->flags
& WIPHY_FLAG_STRICT_REGULATORY
)
1330 wiphy_update_regulatory(wiphy
, initiator
);
1332 mutex_unlock(®_mutex
);
1333 mutex_unlock(&cfg80211_mutex
);
1336 /* Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* */
1337 static void reg_process_pending_hints(void)
1339 struct regulatory_request
*reg_request
;
1341 spin_lock(®_requests_lock
);
1342 while (!list_empty(®_requests_list
)) {
1343 reg_request
= list_first_entry(®_requests_list
,
1344 struct regulatory_request
,
1346 list_del_init(®_request
->list
);
1348 spin_unlock(®_requests_lock
);
1349 reg_process_hint(reg_request
);
1350 spin_lock(®_requests_lock
);
1352 spin_unlock(®_requests_lock
);
1355 /* Processes beacon hints -- this has nothing to do with country IEs */
1356 static void reg_process_pending_beacon_hints(void)
1358 struct cfg80211_registered_device
*rdev
;
1359 struct reg_beacon
*pending_beacon
, *tmp
;
1362 * No need to hold the reg_mutex here as we just touch wiphys
1363 * and do not read or access regulatory variables.
1365 mutex_lock(&cfg80211_mutex
);
1367 /* This goes through the _pending_ beacon list */
1368 spin_lock_bh(®_pending_beacons_lock
);
1370 if (list_empty(®_pending_beacons
)) {
1371 spin_unlock_bh(®_pending_beacons_lock
);
1375 list_for_each_entry_safe(pending_beacon
, tmp
,
1376 ®_pending_beacons
, list
) {
1378 list_del_init(&pending_beacon
->list
);
1380 /* Applies the beacon hint to current wiphys */
1381 list_for_each_entry(rdev
, &cfg80211_rdev_list
, list
)
1382 wiphy_update_new_beacon(&rdev
->wiphy
, pending_beacon
);
1384 /* Remembers the beacon hint for new wiphys or reg changes */
1385 list_add_tail(&pending_beacon
->list
, ®_beacon_list
);
1388 spin_unlock_bh(®_pending_beacons_lock
);
1390 mutex_unlock(&cfg80211_mutex
);
1393 static void reg_todo(struct work_struct
*work
)
1395 reg_process_pending_hints();
1396 reg_process_pending_beacon_hints();
1399 static DECLARE_WORK(reg_work
, reg_todo
);
1401 static void queue_regulatory_request(struct regulatory_request
*request
)
1403 spin_lock(®_requests_lock
);
1404 list_add_tail(&request
->list
, ®_requests_list
);
1405 spin_unlock(®_requests_lock
);
1407 schedule_work(®_work
);
1411 * Core regulatory hint -- happens during cfg80211_init()
1412 * and when we restore regulatory settings.
1414 static int regulatory_hint_core(const char *alpha2
)
1416 struct regulatory_request
*request
;
1418 kfree(last_request
);
1419 last_request
= NULL
;
1421 request
= kzalloc(sizeof(struct regulatory_request
),
1426 request
->alpha2
[0] = alpha2
[0];
1427 request
->alpha2
[1] = alpha2
[1];
1428 request
->initiator
= NL80211_REGDOM_SET_BY_CORE
;
1431 * This ensures last_request is populated once modules
1432 * come swinging in and calling regulatory hints and
1433 * wiphy_apply_custom_regulatory().
1435 reg_process_hint(request
);
1441 int regulatory_hint_user(const char *alpha2
)
1443 struct regulatory_request
*request
;
1447 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
1451 request
->wiphy_idx
= WIPHY_IDX_STALE
;
1452 request
->alpha2
[0] = alpha2
[0];
1453 request
->alpha2
[1] = alpha2
[1];
1454 request
->initiator
= NL80211_REGDOM_SET_BY_USER
;
1456 queue_regulatory_request(request
);
1462 int regulatory_hint(struct wiphy
*wiphy
, const char *alpha2
)
1464 struct regulatory_request
*request
;
1469 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
1473 request
->wiphy_idx
= get_wiphy_idx(wiphy
);
1475 /* Must have registered wiphy first */
1476 BUG_ON(!wiphy_idx_valid(request
->wiphy_idx
));
1478 request
->alpha2
[0] = alpha2
[0];
1479 request
->alpha2
[1] = alpha2
[1];
1480 request
->initiator
= NL80211_REGDOM_SET_BY_DRIVER
;
1482 queue_regulatory_request(request
);
1486 EXPORT_SYMBOL(regulatory_hint
);
1489 * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and
1490 * therefore cannot iterate over the rdev list here.
1492 void regulatory_hint_11d(struct wiphy
*wiphy
,
1493 enum ieee80211_band band
,
1498 enum environment_cap env
= ENVIRON_ANY
;
1499 struct regulatory_request
*request
;
1501 mutex_lock(®_mutex
);
1503 if (unlikely(!last_request
))
1506 /* IE len must be evenly divisible by 2 */
1507 if (country_ie_len
& 0x01)
1510 if (country_ie_len
< IEEE80211_COUNTRY_IE_MIN_LEN
)
1513 alpha2
[0] = country_ie
[0];
1514 alpha2
[1] = country_ie
[1];
1516 if (country_ie
[2] == 'I')
1517 env
= ENVIRON_INDOOR
;
1518 else if (country_ie
[2] == 'O')
1519 env
= ENVIRON_OUTDOOR
;
1522 * We will run this only upon a successful connection on cfg80211.
1523 * We leave conflict resolution to the workqueue, where can hold
1526 if (likely(last_request
->initiator
==
1527 NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
1528 wiphy_idx_valid(last_request
->wiphy_idx
)))
1531 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
1535 request
->wiphy_idx
= get_wiphy_idx(wiphy
);
1536 request
->alpha2
[0] = alpha2
[0];
1537 request
->alpha2
[1] = alpha2
[1];
1538 request
->initiator
= NL80211_REGDOM_SET_BY_COUNTRY_IE
;
1539 request
->country_ie_env
= env
;
1541 mutex_unlock(®_mutex
);
1543 queue_regulatory_request(request
);
1548 mutex_unlock(®_mutex
);
1551 static void restore_alpha2(char *alpha2
, bool reset_user
)
1553 /* indicates there is no alpha2 to consider for restoration */
1557 /* The user setting has precedence over the module parameter */
1558 if (is_user_regdom_saved()) {
1559 /* Unless we're asked to ignore it and reset it */
1561 REG_DBG_PRINT("cfg80211: Restoring regulatory settings "
1562 "including user preference\n");
1563 user_alpha2
[0] = '9';
1564 user_alpha2
[1] = '7';
1567 * If we're ignoring user settings, we still need to
1568 * check the module parameter to ensure we put things
1569 * back as they were for a full restore.
1571 if (!is_world_regdom(ieee80211_regdom
)) {
1572 REG_DBG_PRINT("cfg80211: Keeping preference on "
1573 "module parameter ieee80211_regdom: %c%c\n",
1574 ieee80211_regdom
[0],
1575 ieee80211_regdom
[1]);
1576 alpha2
[0] = ieee80211_regdom
[0];
1577 alpha2
[1] = ieee80211_regdom
[1];
1580 REG_DBG_PRINT("cfg80211: Restoring regulatory settings "
1581 "while preserving user preference for: %c%c\n",
1584 alpha2
[0] = user_alpha2
[0];
1585 alpha2
[1] = user_alpha2
[1];
1587 } else if (!is_world_regdom(ieee80211_regdom
)) {
1588 REG_DBG_PRINT("cfg80211: Keeping preference on "
1589 "module parameter ieee80211_regdom: %c%c\n",
1590 ieee80211_regdom
[0],
1591 ieee80211_regdom
[1]);
1592 alpha2
[0] = ieee80211_regdom
[0];
1593 alpha2
[1] = ieee80211_regdom
[1];
1595 REG_DBG_PRINT("cfg80211: Restoring regulatory settings\n");
1599 * Restoring regulatory settings involves ingoring any
1600 * possibly stale country IE information and user regulatory
1601 * settings if so desired, this includes any beacon hints
1602 * learned as we could have traveled outside to another country
1603 * after disconnection. To restore regulatory settings we do
1604 * exactly what we did at bootup:
1606 * - send a core regulatory hint
1607 * - send a user regulatory hint if applicable
1609 * Device drivers that send a regulatory hint for a specific country
1610 * keep their own regulatory domain on wiphy->regd so that does does
1611 * not need to be remembered.
1613 static void restore_regulatory_settings(bool reset_user
)
1616 struct reg_beacon
*reg_beacon
, *btmp
;
1618 mutex_lock(&cfg80211_mutex
);
1619 mutex_lock(®_mutex
);
1622 restore_alpha2(alpha2
, reset_user
);
1624 /* Clear beacon hints */
1625 spin_lock_bh(®_pending_beacons_lock
);
1626 if (!list_empty(®_pending_beacons
)) {
1627 list_for_each_entry_safe(reg_beacon
, btmp
,
1628 ®_pending_beacons
, list
) {
1629 list_del(®_beacon
->list
);
1633 spin_unlock_bh(®_pending_beacons_lock
);
1635 if (!list_empty(®_beacon_list
)) {
1636 list_for_each_entry_safe(reg_beacon
, btmp
,
1637 ®_beacon_list
, list
) {
1638 list_del(®_beacon
->list
);
1643 /* First restore to the basic regulatory settings */
1644 cfg80211_regdomain
= cfg80211_world_regdom
;
1646 mutex_unlock(®_mutex
);
1647 mutex_unlock(&cfg80211_mutex
);
1649 regulatory_hint_core(cfg80211_regdomain
->alpha2
);
1652 * This restores the ieee80211_regdom module parameter
1653 * preference or the last user requested regulatory
1654 * settings, user regulatory settings takes precedence.
1656 if (is_an_alpha2(alpha2
))
1657 regulatory_hint_user(user_alpha2
);
1661 void regulatory_hint_disconnect(void)
1663 REG_DBG_PRINT("cfg80211: All devices are disconnected, going to "
1664 "restore regulatory settings\n");
1665 restore_regulatory_settings(false);
1668 static bool freq_is_chan_12_13_14(u16 freq
)
1670 if (freq
== ieee80211_channel_to_frequency(12) ||
1671 freq
== ieee80211_channel_to_frequency(13) ||
1672 freq
== ieee80211_channel_to_frequency(14))
1677 int regulatory_hint_found_beacon(struct wiphy
*wiphy
,
1678 struct ieee80211_channel
*beacon_chan
,
1681 struct reg_beacon
*reg_beacon
;
1683 if (likely((beacon_chan
->beacon_found
||
1684 (beacon_chan
->flags
& IEEE80211_CHAN_RADAR
) ||
1685 (beacon_chan
->band
== IEEE80211_BAND_2GHZ
&&
1686 !freq_is_chan_12_13_14(beacon_chan
->center_freq
)))))
1689 reg_beacon
= kzalloc(sizeof(struct reg_beacon
), gfp
);
1693 REG_DBG_PRINT("cfg80211: Found new beacon on "
1694 "frequency: %d MHz (Ch %d) on %s\n",
1695 beacon_chan
->center_freq
,
1696 ieee80211_frequency_to_channel(beacon_chan
->center_freq
),
1699 memcpy(®_beacon
->chan
, beacon_chan
,
1700 sizeof(struct ieee80211_channel
));
1704 * Since we can be called from BH or and non-BH context
1705 * we must use spin_lock_bh()
1707 spin_lock_bh(®_pending_beacons_lock
);
1708 list_add_tail(®_beacon
->list
, ®_pending_beacons
);
1709 spin_unlock_bh(®_pending_beacons_lock
);
1711 schedule_work(®_work
);
1716 static void print_rd_rules(const struct ieee80211_regdomain
*rd
)
1719 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
1720 const struct ieee80211_freq_range
*freq_range
= NULL
;
1721 const struct ieee80211_power_rule
*power_rule
= NULL
;
1723 printk(KERN_INFO
" (start_freq - end_freq @ bandwidth), "
1724 "(max_antenna_gain, max_eirp)\n");
1726 for (i
= 0; i
< rd
->n_reg_rules
; i
++) {
1727 reg_rule
= &rd
->reg_rules
[i
];
1728 freq_range
= ®_rule
->freq_range
;
1729 power_rule
= ®_rule
->power_rule
;
1732 * There may not be documentation for max antenna gain
1733 * in certain regions
1735 if (power_rule
->max_antenna_gain
)
1736 printk(KERN_INFO
" (%d KHz - %d KHz @ %d KHz), "
1737 "(%d mBi, %d mBm)\n",
1738 freq_range
->start_freq_khz
,
1739 freq_range
->end_freq_khz
,
1740 freq_range
->max_bandwidth_khz
,
1741 power_rule
->max_antenna_gain
,
1742 power_rule
->max_eirp
);
1744 printk(KERN_INFO
" (%d KHz - %d KHz @ %d KHz), "
1746 freq_range
->start_freq_khz
,
1747 freq_range
->end_freq_khz
,
1748 freq_range
->max_bandwidth_khz
,
1749 power_rule
->max_eirp
);
1753 static void print_regdomain(const struct ieee80211_regdomain
*rd
)
1756 if (is_intersected_alpha2(rd
->alpha2
)) {
1758 if (last_request
->initiator
==
1759 NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
1760 struct cfg80211_registered_device
*rdev
;
1761 rdev
= cfg80211_rdev_by_wiphy_idx(
1762 last_request
->wiphy_idx
);
1764 printk(KERN_INFO
"cfg80211: Current regulatory "
1765 "domain updated by AP to: %c%c\n",
1766 rdev
->country_ie_alpha2
[0],
1767 rdev
->country_ie_alpha2
[1]);
1769 printk(KERN_INFO
"cfg80211: Current regulatory "
1770 "domain intersected:\n");
1772 printk(KERN_INFO
"cfg80211: Current regulatory "
1773 "domain intersected:\n");
1774 } else if (is_world_regdom(rd
->alpha2
))
1775 printk(KERN_INFO
"cfg80211: World regulatory "
1776 "domain updated:\n");
1778 if (is_unknown_alpha2(rd
->alpha2
))
1779 printk(KERN_INFO
"cfg80211: Regulatory domain "
1780 "changed to driver built-in settings "
1781 "(unknown country)\n");
1783 printk(KERN_INFO
"cfg80211: Regulatory domain "
1784 "changed to country: %c%c\n",
1785 rd
->alpha2
[0], rd
->alpha2
[1]);
1790 static void print_regdomain_info(const struct ieee80211_regdomain
*rd
)
1792 printk(KERN_INFO
"cfg80211: Regulatory domain: %c%c\n",
1793 rd
->alpha2
[0], rd
->alpha2
[1]);
1797 /* Takes ownership of rd only if it doesn't fail */
1798 static int __set_regdom(const struct ieee80211_regdomain
*rd
)
1800 const struct ieee80211_regdomain
*intersected_rd
= NULL
;
1801 struct cfg80211_registered_device
*rdev
= NULL
;
1802 struct wiphy
*request_wiphy
;
1803 /* Some basic sanity checks first */
1805 if (is_world_regdom(rd
->alpha2
)) {
1806 if (WARN_ON(!reg_is_valid_request(rd
->alpha2
)))
1808 update_world_regdomain(rd
);
1812 if (!is_alpha2_set(rd
->alpha2
) && !is_an_alpha2(rd
->alpha2
) &&
1813 !is_unknown_alpha2(rd
->alpha2
))
1820 * Lets only bother proceeding on the same alpha2 if the current
1821 * rd is non static (it means CRDA was present and was used last)
1822 * and the pending request came in from a country IE
1824 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
1826 * If someone else asked us to change the rd lets only bother
1827 * checking if the alpha2 changes if CRDA was already called
1829 if (!regdom_changes(rd
->alpha2
))
1834 * Now lets set the regulatory domain, update all driver channels
1835 * and finally inform them of what we have done, in case they want
1836 * to review or adjust their own settings based on their own
1837 * internal EEPROM data
1840 if (WARN_ON(!reg_is_valid_request(rd
->alpha2
)))
1843 if (!is_valid_rd(rd
)) {
1844 printk(KERN_ERR
"cfg80211: Invalid "
1845 "regulatory domain detected:\n");
1846 print_regdomain_info(rd
);
1850 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
1852 if (!last_request
->intersect
) {
1855 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_DRIVER
) {
1857 cfg80211_regdomain
= rd
;
1862 * For a driver hint, lets copy the regulatory domain the
1863 * driver wanted to the wiphy to deal with conflicts
1867 * Userspace could have sent two replies with only
1868 * one kernel request.
1870 if (request_wiphy
->regd
)
1873 r
= reg_copy_regd(&request_wiphy
->regd
, rd
);
1878 cfg80211_regdomain
= rd
;
1882 /* Intersection requires a bit more work */
1884 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
1886 intersected_rd
= regdom_intersect(rd
, cfg80211_regdomain
);
1887 if (!intersected_rd
)
1891 * We can trash what CRDA provided now.
1892 * However if a driver requested this specific regulatory
1893 * domain we keep it for its private use
1895 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
)
1896 request_wiphy
->regd
= rd
;
1903 cfg80211_regdomain
= intersected_rd
;
1908 if (!intersected_rd
)
1911 rdev
= wiphy_to_dev(request_wiphy
);
1913 rdev
->country_ie_alpha2
[0] = rd
->alpha2
[0];
1914 rdev
->country_ie_alpha2
[1] = rd
->alpha2
[1];
1915 rdev
->env
= last_request
->country_ie_env
;
1917 BUG_ON(intersected_rd
== rd
);
1923 cfg80211_regdomain
= intersected_rd
;
1930 * Use this call to set the current regulatory domain. Conflicts with
1931 * multiple drivers can be ironed out later. Caller must've already
1932 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
1934 int set_regdom(const struct ieee80211_regdomain
*rd
)
1938 assert_cfg80211_lock();
1940 mutex_lock(®_mutex
);
1942 /* Note that this doesn't update the wiphys, this is done below */
1943 r
= __set_regdom(rd
);
1946 mutex_unlock(®_mutex
);
1950 /* This would make this whole thing pointless */
1951 if (!last_request
->intersect
)
1952 BUG_ON(rd
!= cfg80211_regdomain
);
1954 /* update all wiphys now with the new established regulatory domain */
1955 update_all_wiphy_regulatory(last_request
->initiator
);
1957 print_regdomain(cfg80211_regdomain
);
1959 nl80211_send_reg_change_event(last_request
);
1961 mutex_unlock(®_mutex
);
1966 /* Caller must hold cfg80211_mutex */
1967 void reg_device_remove(struct wiphy
*wiphy
)
1969 struct wiphy
*request_wiphy
= NULL
;
1971 assert_cfg80211_lock();
1973 mutex_lock(®_mutex
);
1978 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
1980 if (!request_wiphy
|| request_wiphy
!= wiphy
)
1983 last_request
->wiphy_idx
= WIPHY_IDX_STALE
;
1984 last_request
->country_ie_env
= ENVIRON_ANY
;
1986 mutex_unlock(®_mutex
);
1989 int __init
regulatory_init(void)
1993 reg_pdev
= platform_device_register_simple("regulatory", 0, NULL
, 0);
1994 if (IS_ERR(reg_pdev
))
1995 return PTR_ERR(reg_pdev
);
1997 spin_lock_init(®_requests_lock
);
1998 spin_lock_init(®_pending_beacons_lock
);
2000 cfg80211_regdomain
= cfg80211_world_regdom
;
2002 user_alpha2
[0] = '9';
2003 user_alpha2
[1] = '7';
2005 /* We always try to get an update for the static regdomain */
2006 err
= regulatory_hint_core(cfg80211_regdomain
->alpha2
);
2011 * N.B. kobject_uevent_env() can fail mainly for when we're out
2012 * memory which is handled and propagated appropriately above
2013 * but it can also fail during a netlink_broadcast() or during
2014 * early boot for call_usermodehelper(). For now treat these
2015 * errors as non-fatal.
2017 printk(KERN_ERR
"cfg80211: kobject_uevent_env() was unable "
2018 "to call CRDA during init");
2019 #ifdef CONFIG_CFG80211_REG_DEBUG
2020 /* We want to find out exactly why when debugging */
2026 * Finally, if the user set the module parameter treat it
2029 if (!is_world_regdom(ieee80211_regdom
))
2030 regulatory_hint_user(ieee80211_regdom
);
2035 void /* __init_or_exit */ regulatory_exit(void)
2037 struct regulatory_request
*reg_request
, *tmp
;
2038 struct reg_beacon
*reg_beacon
, *btmp
;
2040 cancel_work_sync(®_work
);
2042 mutex_lock(&cfg80211_mutex
);
2043 mutex_lock(®_mutex
);
2047 kfree(last_request
);
2049 platform_device_unregister(reg_pdev
);
2051 spin_lock_bh(®_pending_beacons_lock
);
2052 if (!list_empty(®_pending_beacons
)) {
2053 list_for_each_entry_safe(reg_beacon
, btmp
,
2054 ®_pending_beacons
, list
) {
2055 list_del(®_beacon
->list
);
2059 spin_unlock_bh(®_pending_beacons_lock
);
2061 if (!list_empty(®_beacon_list
)) {
2062 list_for_each_entry_safe(reg_beacon
, btmp
,
2063 ®_beacon_list
, list
) {
2064 list_del(®_beacon
->list
);
2069 spin_lock(®_requests_lock
);
2070 if (!list_empty(®_requests_list
)) {
2071 list_for_each_entry_safe(reg_request
, tmp
,
2072 ®_requests_list
, list
) {
2073 list_del(®_request
->list
);
2077 spin_unlock(®_requests_lock
);
2079 mutex_unlock(®_mutex
);
2080 mutex_unlock(&cfg80211_mutex
);