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
;
67 * Central wireless core regulatory domains, we only need two,
68 * the current one and a world regulatory domain in case we have no
69 * information to give us an alpha2
71 const struct ieee80211_regdomain
*cfg80211_regdomain
;
74 * Protects static reg.c components:
75 * - cfg80211_world_regdom
79 static DEFINE_MUTEX(reg_mutex
);
81 static inline void assert_reg_lock(void)
83 lockdep_assert_held(®_mutex
);
86 /* Used to queue up regulatory hints */
87 static LIST_HEAD(reg_requests_list
);
88 static spinlock_t reg_requests_lock
;
90 /* Used to queue up beacon hints for review */
91 static LIST_HEAD(reg_pending_beacons
);
92 static spinlock_t reg_pending_beacons_lock
;
94 /* Used to keep track of processed beacon hints */
95 static LIST_HEAD(reg_beacon_list
);
98 struct list_head list
;
99 struct ieee80211_channel chan
;
102 static void reg_todo(struct work_struct
*work
);
103 static DECLARE_WORK(reg_work
, reg_todo
);
105 /* We keep a static world regulatory domain in case of the absence of CRDA */
106 static const struct ieee80211_regdomain world_regdom
= {
110 /* IEEE 802.11b/g, channels 1..11 */
111 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
112 /* IEEE 802.11b/g, channels 12..13. No HT40
113 * channel fits here. */
114 REG_RULE(2467-10, 2472+10, 20, 6, 20,
115 NL80211_RRF_PASSIVE_SCAN
|
116 NL80211_RRF_NO_IBSS
),
117 /* IEEE 802.11 channel 14 - Only JP enables
118 * this and for 802.11b only */
119 REG_RULE(2484-10, 2484+10, 20, 6, 20,
120 NL80211_RRF_PASSIVE_SCAN
|
121 NL80211_RRF_NO_IBSS
|
122 NL80211_RRF_NO_OFDM
),
123 /* IEEE 802.11a, channel 36..48 */
124 REG_RULE(5180-10, 5240+10, 40, 6, 20,
125 NL80211_RRF_PASSIVE_SCAN
|
126 NL80211_RRF_NO_IBSS
),
128 /* NB: 5260 MHz - 5700 MHz requies DFS */
130 /* IEEE 802.11a, channel 149..165 */
131 REG_RULE(5745-10, 5825+10, 40, 6, 20,
132 NL80211_RRF_PASSIVE_SCAN
|
133 NL80211_RRF_NO_IBSS
),
137 static const struct ieee80211_regdomain
*cfg80211_world_regdom
=
140 static char *ieee80211_regdom
= "00";
141 static char user_alpha2
[2];
143 module_param(ieee80211_regdom
, charp
, 0444);
144 MODULE_PARM_DESC(ieee80211_regdom
, "IEEE 802.11 regulatory domain code");
146 static void reset_regdomains(void)
148 /* avoid freeing static information or freeing something twice */
149 if (cfg80211_regdomain
== cfg80211_world_regdom
)
150 cfg80211_regdomain
= NULL
;
151 if (cfg80211_world_regdom
== &world_regdom
)
152 cfg80211_world_regdom
= NULL
;
153 if (cfg80211_regdomain
== &world_regdom
)
154 cfg80211_regdomain
= NULL
;
156 kfree(cfg80211_regdomain
);
157 kfree(cfg80211_world_regdom
);
159 cfg80211_world_regdom
= &world_regdom
;
160 cfg80211_regdomain
= NULL
;
164 * Dynamic world regulatory domain requested by the wireless
165 * core upon initialization
167 static void update_world_regdomain(const struct ieee80211_regdomain
*rd
)
169 BUG_ON(!last_request
);
173 cfg80211_world_regdom
= rd
;
174 cfg80211_regdomain
= rd
;
177 bool is_world_regdom(const char *alpha2
)
181 if (alpha2
[0] == '0' && alpha2
[1] == '0')
186 static bool is_alpha2_set(const char *alpha2
)
190 if (alpha2
[0] != 0 && alpha2
[1] != 0)
195 static bool is_unknown_alpha2(const char *alpha2
)
200 * Special case where regulatory domain was built by driver
201 * but a specific alpha2 cannot be determined
203 if (alpha2
[0] == '9' && alpha2
[1] == '9')
208 static bool is_intersected_alpha2(const char *alpha2
)
213 * Special case where regulatory domain is the
214 * result of an intersection between two regulatory domain
217 if (alpha2
[0] == '9' && alpha2
[1] == '8')
222 static bool is_an_alpha2(const char *alpha2
)
226 if (isalpha(alpha2
[0]) && isalpha(alpha2
[1]))
231 static bool alpha2_equal(const char *alpha2_x
, const char *alpha2_y
)
233 if (!alpha2_x
|| !alpha2_y
)
235 if (alpha2_x
[0] == alpha2_y
[0] &&
236 alpha2_x
[1] == alpha2_y
[1])
241 static bool regdom_changes(const char *alpha2
)
243 assert_cfg80211_lock();
245 if (!cfg80211_regdomain
)
247 if (alpha2_equal(cfg80211_regdomain
->alpha2
, alpha2
))
253 * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
254 * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
255 * has ever been issued.
257 static bool is_user_regdom_saved(void)
259 if (user_alpha2
[0] == '9' && user_alpha2
[1] == '7')
262 /* This would indicate a mistake on the design */
263 if (WARN((!is_world_regdom(user_alpha2
) &&
264 !is_an_alpha2(user_alpha2
)),
265 "Unexpected user alpha2: %c%c\n",
273 static int reg_copy_regd(const struct ieee80211_regdomain
**dst_regd
,
274 const struct ieee80211_regdomain
*src_regd
)
276 struct ieee80211_regdomain
*regd
;
277 int size_of_regd
= 0;
280 size_of_regd
= sizeof(struct ieee80211_regdomain
) +
281 ((src_regd
->n_reg_rules
+ 1) * sizeof(struct ieee80211_reg_rule
));
283 regd
= kzalloc(size_of_regd
, GFP_KERNEL
);
287 memcpy(regd
, src_regd
, sizeof(struct ieee80211_regdomain
));
289 for (i
= 0; i
< src_regd
->n_reg_rules
; i
++)
290 memcpy(®d
->reg_rules
[i
], &src_regd
->reg_rules
[i
],
291 sizeof(struct ieee80211_reg_rule
));
297 #ifdef CONFIG_CFG80211_INTERNAL_REGDB
298 struct reg_regdb_search_request
{
300 struct list_head list
;
303 static LIST_HEAD(reg_regdb_search_list
);
304 static DEFINE_MUTEX(reg_regdb_search_mutex
);
306 static void reg_regdb_search(struct work_struct
*work
)
308 struct reg_regdb_search_request
*request
;
309 const struct ieee80211_regdomain
*curdom
, *regdom
;
312 mutex_lock(®_regdb_search_mutex
);
313 while (!list_empty(®_regdb_search_list
)) {
314 request
= list_first_entry(®_regdb_search_list
,
315 struct reg_regdb_search_request
,
317 list_del(&request
->list
);
319 for (i
=0; i
<reg_regdb_size
; i
++) {
320 curdom
= reg_regdb
[i
];
322 if (!memcmp(request
->alpha2
, curdom
->alpha2
, 2)) {
323 r
= reg_copy_regd(®dom
, curdom
);
326 mutex_lock(&cfg80211_mutex
);
328 mutex_unlock(&cfg80211_mutex
);
335 mutex_unlock(®_regdb_search_mutex
);
338 static DECLARE_WORK(reg_regdb_work
, reg_regdb_search
);
340 static void reg_regdb_query(const char *alpha2
)
342 struct reg_regdb_search_request
*request
;
347 request
= kzalloc(sizeof(struct reg_regdb_search_request
), GFP_KERNEL
);
351 memcpy(request
->alpha2
, alpha2
, 2);
353 mutex_lock(®_regdb_search_mutex
);
354 list_add_tail(&request
->list
, ®_regdb_search_list
);
355 mutex_unlock(®_regdb_search_mutex
);
357 schedule_work(®_regdb_work
);
360 static inline void reg_regdb_query(const char *alpha2
) {}
361 #endif /* CONFIG_CFG80211_INTERNAL_REGDB */
364 * This lets us keep regulatory code which is updated on a regulatory
365 * basis in userspace.
367 static int call_crda(const char *alpha2
)
369 char country_env
[9 + 2] = "COUNTRY=";
375 if (!is_world_regdom((char *) alpha2
))
376 pr_info("Calling CRDA for country: %c%c\n",
377 alpha2
[0], alpha2
[1]);
379 pr_info("Calling CRDA to update world regulatory domain\n");
381 /* query internal regulatory database (if it exists) */
382 reg_regdb_query(alpha2
);
384 country_env
[8] = alpha2
[0];
385 country_env
[9] = alpha2
[1];
387 return kobject_uevent_env(®_pdev
->dev
.kobj
, KOBJ_CHANGE
, envp
);
390 /* Used by nl80211 before kmalloc'ing our regulatory domain */
391 bool reg_is_valid_request(const char *alpha2
)
393 assert_cfg80211_lock();
398 return alpha2_equal(last_request
->alpha2
, alpha2
);
401 /* Sanity check on a regulatory rule */
402 static bool is_valid_reg_rule(const struct ieee80211_reg_rule
*rule
)
404 const struct ieee80211_freq_range
*freq_range
= &rule
->freq_range
;
407 if (freq_range
->start_freq_khz
<= 0 || freq_range
->end_freq_khz
<= 0)
410 if (freq_range
->start_freq_khz
> freq_range
->end_freq_khz
)
413 freq_diff
= freq_range
->end_freq_khz
- freq_range
->start_freq_khz
;
415 if (freq_range
->end_freq_khz
<= freq_range
->start_freq_khz
||
416 freq_range
->max_bandwidth_khz
> freq_diff
)
422 static bool is_valid_rd(const struct ieee80211_regdomain
*rd
)
424 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
427 if (!rd
->n_reg_rules
)
430 if (WARN_ON(rd
->n_reg_rules
> NL80211_MAX_SUPP_REG_RULES
))
433 for (i
= 0; i
< rd
->n_reg_rules
; i
++) {
434 reg_rule
= &rd
->reg_rules
[i
];
435 if (!is_valid_reg_rule(reg_rule
))
442 static bool reg_does_bw_fit(const struct ieee80211_freq_range
*freq_range
,
446 u32 start_freq_khz
, end_freq_khz
;
448 start_freq_khz
= center_freq_khz
- (bw_khz
/2);
449 end_freq_khz
= center_freq_khz
+ (bw_khz
/2);
451 if (start_freq_khz
>= freq_range
->start_freq_khz
&&
452 end_freq_khz
<= freq_range
->end_freq_khz
)
459 * freq_in_rule_band - tells us if a frequency is in a frequency band
460 * @freq_range: frequency rule we want to query
461 * @freq_khz: frequency we are inquiring about
463 * This lets us know if a specific frequency rule is or is not relevant to
464 * a specific frequency's band. Bands are device specific and artificial
465 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
466 * safe for now to assume that a frequency rule should not be part of a
467 * frequency's band if the start freq or end freq are off by more than 2 GHz.
468 * This resolution can be lowered and should be considered as we add
469 * regulatory rule support for other "bands".
471 static bool freq_in_rule_band(const struct ieee80211_freq_range
*freq_range
,
474 #define ONE_GHZ_IN_KHZ 1000000
475 if (abs(freq_khz
- freq_range
->start_freq_khz
) <= (2 * ONE_GHZ_IN_KHZ
))
477 if (abs(freq_khz
- freq_range
->end_freq_khz
) <= (2 * ONE_GHZ_IN_KHZ
))
480 #undef ONE_GHZ_IN_KHZ
484 * Helper for regdom_intersect(), this does the real
485 * mathematical intersection fun
487 static int reg_rules_intersect(
488 const struct ieee80211_reg_rule
*rule1
,
489 const struct ieee80211_reg_rule
*rule2
,
490 struct ieee80211_reg_rule
*intersected_rule
)
492 const struct ieee80211_freq_range
*freq_range1
, *freq_range2
;
493 struct ieee80211_freq_range
*freq_range
;
494 const struct ieee80211_power_rule
*power_rule1
, *power_rule2
;
495 struct ieee80211_power_rule
*power_rule
;
498 freq_range1
= &rule1
->freq_range
;
499 freq_range2
= &rule2
->freq_range
;
500 freq_range
= &intersected_rule
->freq_range
;
502 power_rule1
= &rule1
->power_rule
;
503 power_rule2
= &rule2
->power_rule
;
504 power_rule
= &intersected_rule
->power_rule
;
506 freq_range
->start_freq_khz
= max(freq_range1
->start_freq_khz
,
507 freq_range2
->start_freq_khz
);
508 freq_range
->end_freq_khz
= min(freq_range1
->end_freq_khz
,
509 freq_range2
->end_freq_khz
);
510 freq_range
->max_bandwidth_khz
= min(freq_range1
->max_bandwidth_khz
,
511 freq_range2
->max_bandwidth_khz
);
513 freq_diff
= freq_range
->end_freq_khz
- freq_range
->start_freq_khz
;
514 if (freq_range
->max_bandwidth_khz
> freq_diff
)
515 freq_range
->max_bandwidth_khz
= freq_diff
;
517 power_rule
->max_eirp
= min(power_rule1
->max_eirp
,
518 power_rule2
->max_eirp
);
519 power_rule
->max_antenna_gain
= min(power_rule1
->max_antenna_gain
,
520 power_rule2
->max_antenna_gain
);
522 intersected_rule
->flags
= (rule1
->flags
| rule2
->flags
);
524 if (!is_valid_reg_rule(intersected_rule
))
531 * regdom_intersect - do the intersection between two regulatory domains
532 * @rd1: first regulatory domain
533 * @rd2: second regulatory domain
535 * Use this function to get the intersection between two regulatory domains.
536 * Once completed we will mark the alpha2 for the rd as intersected, "98",
537 * as no one single alpha2 can represent this regulatory domain.
539 * Returns a pointer to the regulatory domain structure which will hold the
540 * resulting intersection of rules between rd1 and rd2. We will
541 * kzalloc() this structure for you.
543 static struct ieee80211_regdomain
*regdom_intersect(
544 const struct ieee80211_regdomain
*rd1
,
545 const struct ieee80211_regdomain
*rd2
)
549 unsigned int num_rules
= 0, rule_idx
= 0;
550 const struct ieee80211_reg_rule
*rule1
, *rule2
;
551 struct ieee80211_reg_rule
*intersected_rule
;
552 struct ieee80211_regdomain
*rd
;
553 /* This is just a dummy holder to help us count */
554 struct ieee80211_reg_rule irule
;
556 /* Uses the stack temporarily for counter arithmetic */
557 intersected_rule
= &irule
;
559 memset(intersected_rule
, 0, sizeof(struct ieee80211_reg_rule
));
565 * First we get a count of the rules we'll need, then we actually
566 * build them. This is to so we can malloc() and free() a
567 * regdomain once. The reason we use reg_rules_intersect() here
568 * is it will return -EINVAL if the rule computed makes no sense.
569 * All rules that do check out OK are valid.
572 for (x
= 0; x
< rd1
->n_reg_rules
; x
++) {
573 rule1
= &rd1
->reg_rules
[x
];
574 for (y
= 0; y
< rd2
->n_reg_rules
; y
++) {
575 rule2
= &rd2
->reg_rules
[y
];
576 if (!reg_rules_intersect(rule1
, rule2
,
579 memset(intersected_rule
, 0,
580 sizeof(struct ieee80211_reg_rule
));
587 size_of_regd
= sizeof(struct ieee80211_regdomain
) +
588 ((num_rules
+ 1) * sizeof(struct ieee80211_reg_rule
));
590 rd
= kzalloc(size_of_regd
, GFP_KERNEL
);
594 for (x
= 0; x
< rd1
->n_reg_rules
; x
++) {
595 rule1
= &rd1
->reg_rules
[x
];
596 for (y
= 0; y
< rd2
->n_reg_rules
; y
++) {
597 rule2
= &rd2
->reg_rules
[y
];
599 * This time around instead of using the stack lets
600 * write to the target rule directly saving ourselves
603 intersected_rule
= &rd
->reg_rules
[rule_idx
];
604 r
= reg_rules_intersect(rule1
, rule2
,
607 * No need to memset here the intersected rule here as
608 * we're not using the stack anymore
616 if (rule_idx
!= num_rules
) {
621 rd
->n_reg_rules
= num_rules
;
629 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
630 * want to just have the channel structure use these
632 static u32
map_regdom_flags(u32 rd_flags
)
634 u32 channel_flags
= 0;
635 if (rd_flags
& NL80211_RRF_PASSIVE_SCAN
)
636 channel_flags
|= IEEE80211_CHAN_PASSIVE_SCAN
;
637 if (rd_flags
& NL80211_RRF_NO_IBSS
)
638 channel_flags
|= IEEE80211_CHAN_NO_IBSS
;
639 if (rd_flags
& NL80211_RRF_DFS
)
640 channel_flags
|= IEEE80211_CHAN_RADAR
;
641 return channel_flags
;
644 static int freq_reg_info_regd(struct wiphy
*wiphy
,
647 const struct ieee80211_reg_rule
**reg_rule
,
648 const struct ieee80211_regdomain
*custom_regd
)
651 bool band_rule_found
= false;
652 const struct ieee80211_regdomain
*regd
;
653 bool bw_fits
= false;
656 desired_bw_khz
= MHZ_TO_KHZ(20);
658 regd
= custom_regd
? custom_regd
: cfg80211_regdomain
;
661 * Follow the driver's regulatory domain, if present, unless a country
662 * IE has been processed or a user wants to help complaince further
665 last_request
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
666 last_request
->initiator
!= NL80211_REGDOM_SET_BY_USER
&&
673 for (i
= 0; i
< regd
->n_reg_rules
; i
++) {
674 const struct ieee80211_reg_rule
*rr
;
675 const struct ieee80211_freq_range
*fr
= NULL
;
676 const struct ieee80211_power_rule
*pr
= NULL
;
678 rr
= ®d
->reg_rules
[i
];
679 fr
= &rr
->freq_range
;
680 pr
= &rr
->power_rule
;
683 * We only need to know if one frequency rule was
684 * was in center_freq's band, that's enough, so lets
685 * not overwrite it once found
687 if (!band_rule_found
)
688 band_rule_found
= freq_in_rule_band(fr
, center_freq
);
690 bw_fits
= reg_does_bw_fit(fr
,
694 if (band_rule_found
&& bw_fits
) {
700 if (!band_rule_found
)
706 int freq_reg_info(struct wiphy
*wiphy
,
709 const struct ieee80211_reg_rule
**reg_rule
)
711 assert_cfg80211_lock();
712 return freq_reg_info_regd(wiphy
,
718 EXPORT_SYMBOL(freq_reg_info
);
720 #ifdef CONFIG_CFG80211_REG_DEBUG
721 static const char *reg_initiator_name(enum nl80211_reg_initiator initiator
)
724 case NL80211_REGDOM_SET_BY_CORE
:
725 return "Set by core";
726 case NL80211_REGDOM_SET_BY_USER
:
727 return "Set by user";
728 case NL80211_REGDOM_SET_BY_DRIVER
:
729 return "Set by driver";
730 case NL80211_REGDOM_SET_BY_COUNTRY_IE
:
731 return "Set by country IE";
738 static void chan_reg_rule_print_dbg(struct ieee80211_channel
*chan
,
740 const struct ieee80211_reg_rule
*reg_rule
)
742 const struct ieee80211_power_rule
*power_rule
;
743 const struct ieee80211_freq_range
*freq_range
;
744 char max_antenna_gain
[32];
746 power_rule
= ®_rule
->power_rule
;
747 freq_range
= ®_rule
->freq_range
;
749 if (!power_rule
->max_antenna_gain
)
750 snprintf(max_antenna_gain
, 32, "N/A");
752 snprintf(max_antenna_gain
, 32, "%d", power_rule
->max_antenna_gain
);
754 REG_DBG_PRINT("Updating information on frequency %d MHz "
755 "for a %d MHz width channel with regulatory rule:\n",
757 KHZ_TO_MHZ(desired_bw_khz
));
759 REG_DBG_PRINT("%d KHz - %d KHz @ KHz), (%s mBi, %d mBm)\n",
760 freq_range
->start_freq_khz
,
761 freq_range
->end_freq_khz
,
763 power_rule
->max_eirp
);
766 static void chan_reg_rule_print_dbg(struct ieee80211_channel
*chan
,
768 const struct ieee80211_reg_rule
*reg_rule
)
775 * Note that right now we assume the desired channel bandwidth
776 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
777 * per channel, the primary and the extension channel). To support
778 * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a
779 * new ieee80211_channel.target_bw and re run the regulatory check
780 * on the wiphy with the target_bw specified. Then we can simply use
781 * that below for the desired_bw_khz below.
783 static void handle_channel(struct wiphy
*wiphy
,
784 enum nl80211_reg_initiator initiator
,
785 enum ieee80211_band band
,
786 unsigned int chan_idx
)
789 u32 flags
, bw_flags
= 0;
790 u32 desired_bw_khz
= MHZ_TO_KHZ(20);
791 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
792 const struct ieee80211_power_rule
*power_rule
= NULL
;
793 const struct ieee80211_freq_range
*freq_range
= NULL
;
794 struct ieee80211_supported_band
*sband
;
795 struct ieee80211_channel
*chan
;
796 struct wiphy
*request_wiphy
= NULL
;
798 assert_cfg80211_lock();
800 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
802 sband
= wiphy
->bands
[band
];
803 BUG_ON(chan_idx
>= sband
->n_channels
);
804 chan
= &sband
->channels
[chan_idx
];
806 flags
= chan
->orig_flags
;
808 r
= freq_reg_info(wiphy
,
809 MHZ_TO_KHZ(chan
->center_freq
),
815 * We will disable all channels that do not match our
816 * recieved regulatory rule unless the hint is coming
817 * from a Country IE and the Country IE had no information
818 * about a band. The IEEE 802.11 spec allows for an AP
819 * to send only a subset of the regulatory rules allowed,
820 * so an AP in the US that only supports 2.4 GHz may only send
821 * a country IE with information for the 2.4 GHz band
822 * while 5 GHz is still supported.
824 if (initiator
== NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
828 REG_DBG_PRINT("Disabling freq %d MHz\n", chan
->center_freq
);
829 chan
->flags
= IEEE80211_CHAN_DISABLED
;
833 chan_reg_rule_print_dbg(chan
, desired_bw_khz
, reg_rule
);
835 power_rule
= ®_rule
->power_rule
;
836 freq_range
= ®_rule
->freq_range
;
838 if (freq_range
->max_bandwidth_khz
< MHZ_TO_KHZ(40))
839 bw_flags
= IEEE80211_CHAN_NO_HT40
;
841 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
&&
842 request_wiphy
&& request_wiphy
== wiphy
&&
843 request_wiphy
->flags
& WIPHY_FLAG_STRICT_REGULATORY
) {
845 * This gaurantees the driver's requested regulatory domain
846 * will always be used as a base for further regulatory
849 chan
->flags
= chan
->orig_flags
=
850 map_regdom_flags(reg_rule
->flags
) | bw_flags
;
851 chan
->max_antenna_gain
= chan
->orig_mag
=
852 (int) MBI_TO_DBI(power_rule
->max_antenna_gain
);
853 chan
->max_power
= chan
->orig_mpwr
=
854 (int) MBM_TO_DBM(power_rule
->max_eirp
);
858 chan
->flags
= flags
| bw_flags
| map_regdom_flags(reg_rule
->flags
);
859 chan
->max_antenna_gain
= min(chan
->orig_mag
,
860 (int) MBI_TO_DBI(power_rule
->max_antenna_gain
));
862 chan
->max_power
= min(chan
->orig_mpwr
,
863 (int) MBM_TO_DBM(power_rule
->max_eirp
));
865 chan
->max_power
= (int) MBM_TO_DBM(power_rule
->max_eirp
);
868 static void handle_band(struct wiphy
*wiphy
,
869 enum ieee80211_band band
,
870 enum nl80211_reg_initiator initiator
)
873 struct ieee80211_supported_band
*sband
;
875 BUG_ON(!wiphy
->bands
[band
]);
876 sband
= wiphy
->bands
[band
];
878 for (i
= 0; i
< sband
->n_channels
; i
++)
879 handle_channel(wiphy
, initiator
, band
, i
);
882 static bool ignore_reg_update(struct wiphy
*wiphy
,
883 enum nl80211_reg_initiator initiator
)
886 REG_DBG_PRINT("Ignoring regulatory request %s since "
887 "last_request is not set\n",
888 reg_initiator_name(initiator
));
892 if (initiator
== NL80211_REGDOM_SET_BY_CORE
&&
893 wiphy
->flags
& WIPHY_FLAG_CUSTOM_REGULATORY
) {
894 REG_DBG_PRINT("Ignoring regulatory request %s "
895 "since the driver uses its own custom "
896 "regulatory domain ",
897 reg_initiator_name(initiator
));
902 * wiphy->regd will be set once the device has its own
903 * desired regulatory domain set
905 if (wiphy
->flags
& WIPHY_FLAG_STRICT_REGULATORY
&& !wiphy
->regd
&&
906 initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
907 !is_world_regdom(last_request
->alpha2
)) {
908 REG_DBG_PRINT("Ignoring regulatory request %s "
909 "since the driver requires its own regulaotry "
910 "domain to be set first",
911 reg_initiator_name(initiator
));
918 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator
)
920 struct cfg80211_registered_device
*rdev
;
922 list_for_each_entry(rdev
, &cfg80211_rdev_list
, list
)
923 wiphy_update_regulatory(&rdev
->wiphy
, initiator
);
926 static void handle_reg_beacon(struct wiphy
*wiphy
,
927 unsigned int chan_idx
,
928 struct reg_beacon
*reg_beacon
)
930 struct ieee80211_supported_band
*sband
;
931 struct ieee80211_channel
*chan
;
932 bool channel_changed
= false;
933 struct ieee80211_channel chan_before
;
935 assert_cfg80211_lock();
937 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
938 chan
= &sband
->channels
[chan_idx
];
940 if (likely(chan
->center_freq
!= reg_beacon
->chan
.center_freq
))
943 if (chan
->beacon_found
)
946 chan
->beacon_found
= true;
948 if (wiphy
->flags
& WIPHY_FLAG_DISABLE_BEACON_HINTS
)
951 chan_before
.center_freq
= chan
->center_freq
;
952 chan_before
.flags
= chan
->flags
;
954 if (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
) {
955 chan
->flags
&= ~IEEE80211_CHAN_PASSIVE_SCAN
;
956 channel_changed
= true;
959 if (chan
->flags
& IEEE80211_CHAN_NO_IBSS
) {
960 chan
->flags
&= ~IEEE80211_CHAN_NO_IBSS
;
961 channel_changed
= true;
965 nl80211_send_beacon_hint_event(wiphy
, &chan_before
, chan
);
969 * Called when a scan on a wiphy finds a beacon on
972 static void wiphy_update_new_beacon(struct wiphy
*wiphy
,
973 struct reg_beacon
*reg_beacon
)
976 struct ieee80211_supported_band
*sband
;
978 assert_cfg80211_lock();
980 if (!wiphy
->bands
[reg_beacon
->chan
.band
])
983 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
985 for (i
= 0; i
< sband
->n_channels
; i
++)
986 handle_reg_beacon(wiphy
, i
, reg_beacon
);
990 * Called upon reg changes or a new wiphy is added
992 static void wiphy_update_beacon_reg(struct wiphy
*wiphy
)
995 struct ieee80211_supported_band
*sband
;
996 struct reg_beacon
*reg_beacon
;
998 assert_cfg80211_lock();
1000 if (list_empty(®_beacon_list
))
1003 list_for_each_entry(reg_beacon
, ®_beacon_list
, list
) {
1004 if (!wiphy
->bands
[reg_beacon
->chan
.band
])
1006 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
1007 for (i
= 0; i
< sband
->n_channels
; i
++)
1008 handle_reg_beacon(wiphy
, i
, reg_beacon
);
1012 static bool reg_is_world_roaming(struct wiphy
*wiphy
)
1014 if (is_world_regdom(cfg80211_regdomain
->alpha2
) ||
1015 (wiphy
->regd
&& is_world_regdom(wiphy
->regd
->alpha2
)))
1018 last_request
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
1019 wiphy
->flags
& WIPHY_FLAG_CUSTOM_REGULATORY
)
1024 /* Reap the advantages of previously found beacons */
1025 static void reg_process_beacons(struct wiphy
*wiphy
)
1028 * Means we are just firing up cfg80211, so no beacons would
1029 * have been processed yet.
1033 if (!reg_is_world_roaming(wiphy
))
1035 wiphy_update_beacon_reg(wiphy
);
1038 static bool is_ht40_not_allowed(struct ieee80211_channel
*chan
)
1042 if (chan
->flags
& IEEE80211_CHAN_DISABLED
)
1044 /* This would happen when regulatory rules disallow HT40 completely */
1045 if (IEEE80211_CHAN_NO_HT40
== (chan
->flags
& (IEEE80211_CHAN_NO_HT40
)))
1050 static void reg_process_ht_flags_channel(struct wiphy
*wiphy
,
1051 enum ieee80211_band band
,
1052 unsigned int chan_idx
)
1054 struct ieee80211_supported_band
*sband
;
1055 struct ieee80211_channel
*channel
;
1056 struct ieee80211_channel
*channel_before
= NULL
, *channel_after
= NULL
;
1059 assert_cfg80211_lock();
1061 sband
= wiphy
->bands
[band
];
1062 BUG_ON(chan_idx
>= sband
->n_channels
);
1063 channel
= &sband
->channels
[chan_idx
];
1065 if (is_ht40_not_allowed(channel
)) {
1066 channel
->flags
|= IEEE80211_CHAN_NO_HT40
;
1071 * We need to ensure the extension channels exist to
1072 * be able to use HT40- or HT40+, this finds them (or not)
1074 for (i
= 0; i
< sband
->n_channels
; i
++) {
1075 struct ieee80211_channel
*c
= &sband
->channels
[i
];
1076 if (c
->center_freq
== (channel
->center_freq
- 20))
1078 if (c
->center_freq
== (channel
->center_freq
+ 20))
1083 * Please note that this assumes target bandwidth is 20 MHz,
1084 * if that ever changes we also need to change the below logic
1085 * to include that as well.
1087 if (is_ht40_not_allowed(channel_before
))
1088 channel
->flags
|= IEEE80211_CHAN_NO_HT40MINUS
;
1090 channel
->flags
&= ~IEEE80211_CHAN_NO_HT40MINUS
;
1092 if (is_ht40_not_allowed(channel_after
))
1093 channel
->flags
|= IEEE80211_CHAN_NO_HT40PLUS
;
1095 channel
->flags
&= ~IEEE80211_CHAN_NO_HT40PLUS
;
1098 static void reg_process_ht_flags_band(struct wiphy
*wiphy
,
1099 enum ieee80211_band band
)
1102 struct ieee80211_supported_band
*sband
;
1104 BUG_ON(!wiphy
->bands
[band
]);
1105 sband
= wiphy
->bands
[band
];
1107 for (i
= 0; i
< sband
->n_channels
; i
++)
1108 reg_process_ht_flags_channel(wiphy
, band
, i
);
1111 static void reg_process_ht_flags(struct wiphy
*wiphy
)
1113 enum ieee80211_band band
;
1118 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
1119 if (wiphy
->bands
[band
])
1120 reg_process_ht_flags_band(wiphy
, band
);
1125 void wiphy_update_regulatory(struct wiphy
*wiphy
,
1126 enum nl80211_reg_initiator initiator
)
1128 enum ieee80211_band band
;
1130 if (ignore_reg_update(wiphy
, initiator
))
1132 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
1133 if (wiphy
->bands
[band
])
1134 handle_band(wiphy
, band
, initiator
);
1137 reg_process_beacons(wiphy
);
1138 reg_process_ht_flags(wiphy
);
1139 if (wiphy
->reg_notifier
)
1140 wiphy
->reg_notifier(wiphy
, last_request
);
1143 static void handle_channel_custom(struct wiphy
*wiphy
,
1144 enum ieee80211_band band
,
1145 unsigned int chan_idx
,
1146 const struct ieee80211_regdomain
*regd
)
1149 u32 desired_bw_khz
= MHZ_TO_KHZ(20);
1151 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
1152 const struct ieee80211_power_rule
*power_rule
= NULL
;
1153 const struct ieee80211_freq_range
*freq_range
= NULL
;
1154 struct ieee80211_supported_band
*sband
;
1155 struct ieee80211_channel
*chan
;
1159 sband
= wiphy
->bands
[band
];
1160 BUG_ON(chan_idx
>= sband
->n_channels
);
1161 chan
= &sband
->channels
[chan_idx
];
1163 r
= freq_reg_info_regd(wiphy
,
1164 MHZ_TO_KHZ(chan
->center_freq
),
1170 REG_DBG_PRINT("Disabling freq %d MHz as custom "
1171 "regd has no rule that fits a %d MHz "
1174 KHZ_TO_MHZ(desired_bw_khz
));
1175 chan
->flags
= IEEE80211_CHAN_DISABLED
;
1179 chan_reg_rule_print_dbg(chan
, desired_bw_khz
, reg_rule
);
1181 power_rule
= ®_rule
->power_rule
;
1182 freq_range
= ®_rule
->freq_range
;
1184 if (freq_range
->max_bandwidth_khz
< MHZ_TO_KHZ(40))
1185 bw_flags
= IEEE80211_CHAN_NO_HT40
;
1187 chan
->flags
|= map_regdom_flags(reg_rule
->flags
) | bw_flags
;
1188 chan
->max_antenna_gain
= (int) MBI_TO_DBI(power_rule
->max_antenna_gain
);
1189 chan
->max_power
= (int) MBM_TO_DBM(power_rule
->max_eirp
);
1192 static void handle_band_custom(struct wiphy
*wiphy
, enum ieee80211_band band
,
1193 const struct ieee80211_regdomain
*regd
)
1196 struct ieee80211_supported_band
*sband
;
1198 BUG_ON(!wiphy
->bands
[band
]);
1199 sband
= wiphy
->bands
[band
];
1201 for (i
= 0; i
< sband
->n_channels
; i
++)
1202 handle_channel_custom(wiphy
, band
, i
, regd
);
1205 /* Used by drivers prior to wiphy registration */
1206 void wiphy_apply_custom_regulatory(struct wiphy
*wiphy
,
1207 const struct ieee80211_regdomain
*regd
)
1209 enum ieee80211_band band
;
1210 unsigned int bands_set
= 0;
1212 mutex_lock(®_mutex
);
1213 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
1214 if (!wiphy
->bands
[band
])
1216 handle_band_custom(wiphy
, band
, regd
);
1219 mutex_unlock(®_mutex
);
1222 * no point in calling this if it won't have any effect
1223 * on your device's supportd bands.
1225 WARN_ON(!bands_set
);
1227 EXPORT_SYMBOL(wiphy_apply_custom_regulatory
);
1230 * Return value which can be used by ignore_request() to indicate
1231 * it has been determined we should intersect two regulatory domains
1233 #define REG_INTERSECT 1
1235 /* This has the logic which determines when a new request
1236 * should be ignored. */
1237 static int ignore_request(struct wiphy
*wiphy
,
1238 struct regulatory_request
*pending_request
)
1240 struct wiphy
*last_wiphy
= NULL
;
1242 assert_cfg80211_lock();
1244 /* All initial requests are respected */
1248 switch (pending_request
->initiator
) {
1249 case NL80211_REGDOM_SET_BY_CORE
:
1251 case NL80211_REGDOM_SET_BY_COUNTRY_IE
:
1253 last_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
1255 if (unlikely(!is_an_alpha2(pending_request
->alpha2
)))
1257 if (last_request
->initiator
==
1258 NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
1259 if (last_wiphy
!= wiphy
) {
1261 * Two cards with two APs claiming different
1262 * Country IE alpha2s. We could
1263 * intersect them, but that seems unlikely
1264 * to be correct. Reject second one for now.
1266 if (regdom_changes(pending_request
->alpha2
))
1271 * Two consecutive Country IE hints on the same wiphy.
1272 * This should be picked up early by the driver/stack
1274 if (WARN_ON(regdom_changes(pending_request
->alpha2
)))
1279 case NL80211_REGDOM_SET_BY_DRIVER
:
1280 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_CORE
) {
1281 if (regdom_changes(pending_request
->alpha2
))
1287 * This would happen if you unplug and plug your card
1288 * back in or if you add a new device for which the previously
1289 * loaded card also agrees on the regulatory domain.
1291 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
&&
1292 !regdom_changes(pending_request
->alpha2
))
1295 return REG_INTERSECT
;
1296 case NL80211_REGDOM_SET_BY_USER
:
1297 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_COUNTRY_IE
)
1298 return REG_INTERSECT
;
1300 * If the user knows better the user should set the regdom
1301 * to their country before the IE is picked up
1303 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_USER
&&
1304 last_request
->intersect
)
1307 * Process user requests only after previous user/driver/core
1308 * requests have been processed
1310 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_CORE
||
1311 last_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
||
1312 last_request
->initiator
== NL80211_REGDOM_SET_BY_USER
) {
1313 if (regdom_changes(last_request
->alpha2
))
1317 if (!regdom_changes(pending_request
->alpha2
))
1326 static void reg_set_request_processed(void)
1328 bool need_more_processing
= false;
1330 last_request
->processed
= true;
1332 spin_lock(®_requests_lock
);
1333 if (!list_empty(®_requests_list
))
1334 need_more_processing
= true;
1335 spin_unlock(®_requests_lock
);
1337 if (need_more_processing
)
1338 schedule_work(®_work
);
1342 * __regulatory_hint - hint to the wireless core a regulatory domain
1343 * @wiphy: if the hint comes from country information from an AP, this
1344 * is required to be set to the wiphy that received the information
1345 * @pending_request: the regulatory request currently being processed
1347 * The Wireless subsystem can use this function to hint to the wireless core
1348 * what it believes should be the current regulatory domain.
1350 * Returns zero if all went fine, %-EALREADY if a regulatory domain had
1351 * already been set or other standard error codes.
1353 * Caller must hold &cfg80211_mutex and ®_mutex
1355 static int __regulatory_hint(struct wiphy
*wiphy
,
1356 struct regulatory_request
*pending_request
)
1358 bool intersect
= false;
1361 assert_cfg80211_lock();
1363 r
= ignore_request(wiphy
, pending_request
);
1365 if (r
== REG_INTERSECT
) {
1366 if (pending_request
->initiator
==
1367 NL80211_REGDOM_SET_BY_DRIVER
) {
1368 r
= reg_copy_regd(&wiphy
->regd
, cfg80211_regdomain
);
1370 kfree(pending_request
);
1377 * If the regulatory domain being requested by the
1378 * driver has already been set just copy it to the
1381 if (r
== -EALREADY
&&
1382 pending_request
->initiator
==
1383 NL80211_REGDOM_SET_BY_DRIVER
) {
1384 r
= reg_copy_regd(&wiphy
->regd
, cfg80211_regdomain
);
1386 kfree(pending_request
);
1392 kfree(pending_request
);
1397 kfree(last_request
);
1399 last_request
= pending_request
;
1400 last_request
->intersect
= intersect
;
1402 pending_request
= NULL
;
1404 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_USER
) {
1405 user_alpha2
[0] = last_request
->alpha2
[0];
1406 user_alpha2
[1] = last_request
->alpha2
[1];
1409 /* When r == REG_INTERSECT we do need to call CRDA */
1412 * Since CRDA will not be called in this case as we already
1413 * have applied the requested regulatory domain before we just
1414 * inform userspace we have processed the request
1416 if (r
== -EALREADY
) {
1417 nl80211_send_reg_change_event(last_request
);
1418 reg_set_request_processed();
1423 return call_crda(last_request
->alpha2
);
1426 /* This processes *all* regulatory hints */
1427 static void reg_process_hint(struct regulatory_request
*reg_request
)
1430 struct wiphy
*wiphy
= NULL
;
1431 enum nl80211_reg_initiator initiator
= reg_request
->initiator
;
1433 BUG_ON(!reg_request
->alpha2
);
1435 if (wiphy_idx_valid(reg_request
->wiphy_idx
))
1436 wiphy
= wiphy_idx_to_wiphy(reg_request
->wiphy_idx
);
1438 if (reg_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
&&
1444 r
= __regulatory_hint(wiphy
, reg_request
);
1445 /* This is required so that the orig_* parameters are saved */
1446 if (r
== -EALREADY
&& wiphy
&&
1447 wiphy
->flags
& WIPHY_FLAG_STRICT_REGULATORY
)
1448 wiphy_update_regulatory(wiphy
, initiator
);
1452 * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
1453 * Regulatory hints come on a first come first serve basis and we
1454 * must process each one atomically.
1456 static void reg_process_pending_hints(void)
1458 struct regulatory_request
*reg_request
;
1460 mutex_lock(&cfg80211_mutex
);
1461 mutex_lock(®_mutex
);
1463 /* When last_request->processed becomes true this will be rescheduled */
1464 if (last_request
&& !last_request
->processed
) {
1465 REG_DBG_PRINT("Pending regulatory request, waiting "
1466 "for it to be processed...");
1470 spin_lock(®_requests_lock
);
1472 if (list_empty(®_requests_list
)) {
1473 spin_unlock(®_requests_lock
);
1477 reg_request
= list_first_entry(®_requests_list
,
1478 struct regulatory_request
,
1480 list_del_init(®_request
->list
);
1482 spin_unlock(®_requests_lock
);
1484 reg_process_hint(reg_request
);
1487 mutex_unlock(®_mutex
);
1488 mutex_unlock(&cfg80211_mutex
);
1491 /* Processes beacon hints -- this has nothing to do with country IEs */
1492 static void reg_process_pending_beacon_hints(void)
1494 struct cfg80211_registered_device
*rdev
;
1495 struct reg_beacon
*pending_beacon
, *tmp
;
1498 * No need to hold the reg_mutex here as we just touch wiphys
1499 * and do not read or access regulatory variables.
1501 mutex_lock(&cfg80211_mutex
);
1503 /* This goes through the _pending_ beacon list */
1504 spin_lock_bh(®_pending_beacons_lock
);
1506 if (list_empty(®_pending_beacons
)) {
1507 spin_unlock_bh(®_pending_beacons_lock
);
1511 list_for_each_entry_safe(pending_beacon
, tmp
,
1512 ®_pending_beacons
, list
) {
1514 list_del_init(&pending_beacon
->list
);
1516 /* Applies the beacon hint to current wiphys */
1517 list_for_each_entry(rdev
, &cfg80211_rdev_list
, list
)
1518 wiphy_update_new_beacon(&rdev
->wiphy
, pending_beacon
);
1520 /* Remembers the beacon hint for new wiphys or reg changes */
1521 list_add_tail(&pending_beacon
->list
, ®_beacon_list
);
1524 spin_unlock_bh(®_pending_beacons_lock
);
1526 mutex_unlock(&cfg80211_mutex
);
1529 static void reg_todo(struct work_struct
*work
)
1531 reg_process_pending_hints();
1532 reg_process_pending_beacon_hints();
1535 static void queue_regulatory_request(struct regulatory_request
*request
)
1537 if (isalpha(request
->alpha2
[0]))
1538 request
->alpha2
[0] = toupper(request
->alpha2
[0]);
1539 if (isalpha(request
->alpha2
[1]))
1540 request
->alpha2
[1] = toupper(request
->alpha2
[1]);
1542 spin_lock(®_requests_lock
);
1543 list_add_tail(&request
->list
, ®_requests_list
);
1544 spin_unlock(®_requests_lock
);
1546 schedule_work(®_work
);
1550 * Core regulatory hint -- happens during cfg80211_init()
1551 * and when we restore regulatory settings.
1553 static int regulatory_hint_core(const char *alpha2
)
1555 struct regulatory_request
*request
;
1557 kfree(last_request
);
1558 last_request
= NULL
;
1560 request
= kzalloc(sizeof(struct regulatory_request
),
1565 request
->alpha2
[0] = alpha2
[0];
1566 request
->alpha2
[1] = alpha2
[1];
1567 request
->initiator
= NL80211_REGDOM_SET_BY_CORE
;
1569 queue_regulatory_request(request
);
1575 int regulatory_hint_user(const char *alpha2
)
1577 struct regulatory_request
*request
;
1581 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
1585 request
->wiphy_idx
= WIPHY_IDX_STALE
;
1586 request
->alpha2
[0] = alpha2
[0];
1587 request
->alpha2
[1] = alpha2
[1];
1588 request
->initiator
= NL80211_REGDOM_SET_BY_USER
;
1590 queue_regulatory_request(request
);
1596 int regulatory_hint(struct wiphy
*wiphy
, const char *alpha2
)
1598 struct regulatory_request
*request
;
1603 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
1607 request
->wiphy_idx
= get_wiphy_idx(wiphy
);
1609 /* Must have registered wiphy first */
1610 BUG_ON(!wiphy_idx_valid(request
->wiphy_idx
));
1612 request
->alpha2
[0] = alpha2
[0];
1613 request
->alpha2
[1] = alpha2
[1];
1614 request
->initiator
= NL80211_REGDOM_SET_BY_DRIVER
;
1616 queue_regulatory_request(request
);
1620 EXPORT_SYMBOL(regulatory_hint
);
1623 * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and
1624 * therefore cannot iterate over the rdev list here.
1626 void regulatory_hint_11d(struct wiphy
*wiphy
,
1627 enum ieee80211_band band
,
1632 enum environment_cap env
= ENVIRON_ANY
;
1633 struct regulatory_request
*request
;
1635 mutex_lock(®_mutex
);
1637 if (unlikely(!last_request
))
1640 /* IE len must be evenly divisible by 2 */
1641 if (country_ie_len
& 0x01)
1644 if (country_ie_len
< IEEE80211_COUNTRY_IE_MIN_LEN
)
1647 alpha2
[0] = country_ie
[0];
1648 alpha2
[1] = country_ie
[1];
1650 if (country_ie
[2] == 'I')
1651 env
= ENVIRON_INDOOR
;
1652 else if (country_ie
[2] == 'O')
1653 env
= ENVIRON_OUTDOOR
;
1656 * We will run this only upon a successful connection on cfg80211.
1657 * We leave conflict resolution to the workqueue, where can hold
1660 if (likely(last_request
->initiator
==
1661 NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
1662 wiphy_idx_valid(last_request
->wiphy_idx
)))
1665 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
1669 request
->wiphy_idx
= get_wiphy_idx(wiphy
);
1670 request
->alpha2
[0] = alpha2
[0];
1671 request
->alpha2
[1] = alpha2
[1];
1672 request
->initiator
= NL80211_REGDOM_SET_BY_COUNTRY_IE
;
1673 request
->country_ie_env
= env
;
1675 mutex_unlock(®_mutex
);
1677 queue_regulatory_request(request
);
1682 mutex_unlock(®_mutex
);
1685 static void restore_alpha2(char *alpha2
, bool reset_user
)
1687 /* indicates there is no alpha2 to consider for restoration */
1691 /* The user setting has precedence over the module parameter */
1692 if (is_user_regdom_saved()) {
1693 /* Unless we're asked to ignore it and reset it */
1695 REG_DBG_PRINT("Restoring regulatory settings "
1696 "including user preference\n");
1697 user_alpha2
[0] = '9';
1698 user_alpha2
[1] = '7';
1701 * If we're ignoring user settings, we still need to
1702 * check the module parameter to ensure we put things
1703 * back as they were for a full restore.
1705 if (!is_world_regdom(ieee80211_regdom
)) {
1706 REG_DBG_PRINT("Keeping preference on "
1707 "module parameter ieee80211_regdom: %c%c\n",
1708 ieee80211_regdom
[0],
1709 ieee80211_regdom
[1]);
1710 alpha2
[0] = ieee80211_regdom
[0];
1711 alpha2
[1] = ieee80211_regdom
[1];
1714 REG_DBG_PRINT("Restoring regulatory settings "
1715 "while preserving user preference for: %c%c\n",
1718 alpha2
[0] = user_alpha2
[0];
1719 alpha2
[1] = user_alpha2
[1];
1721 } else if (!is_world_regdom(ieee80211_regdom
)) {
1722 REG_DBG_PRINT("Keeping preference on "
1723 "module parameter ieee80211_regdom: %c%c\n",
1724 ieee80211_regdom
[0],
1725 ieee80211_regdom
[1]);
1726 alpha2
[0] = ieee80211_regdom
[0];
1727 alpha2
[1] = ieee80211_regdom
[1];
1729 REG_DBG_PRINT("Restoring regulatory settings\n");
1733 * Restoring regulatory settings involves ingoring any
1734 * possibly stale country IE information and user regulatory
1735 * settings if so desired, this includes any beacon hints
1736 * learned as we could have traveled outside to another country
1737 * after disconnection. To restore regulatory settings we do
1738 * exactly what we did at bootup:
1740 * - send a core regulatory hint
1741 * - send a user regulatory hint if applicable
1743 * Device drivers that send a regulatory hint for a specific country
1744 * keep their own regulatory domain on wiphy->regd so that does does
1745 * not need to be remembered.
1747 static void restore_regulatory_settings(bool reset_user
)
1750 struct reg_beacon
*reg_beacon
, *btmp
;
1752 mutex_lock(&cfg80211_mutex
);
1753 mutex_lock(®_mutex
);
1756 restore_alpha2(alpha2
, reset_user
);
1758 /* Clear beacon hints */
1759 spin_lock_bh(®_pending_beacons_lock
);
1760 if (!list_empty(®_pending_beacons
)) {
1761 list_for_each_entry_safe(reg_beacon
, btmp
,
1762 ®_pending_beacons
, list
) {
1763 list_del(®_beacon
->list
);
1767 spin_unlock_bh(®_pending_beacons_lock
);
1769 if (!list_empty(®_beacon_list
)) {
1770 list_for_each_entry_safe(reg_beacon
, btmp
,
1771 ®_beacon_list
, list
) {
1772 list_del(®_beacon
->list
);
1777 /* First restore to the basic regulatory settings */
1778 cfg80211_regdomain
= cfg80211_world_regdom
;
1780 mutex_unlock(®_mutex
);
1781 mutex_unlock(&cfg80211_mutex
);
1783 regulatory_hint_core(cfg80211_regdomain
->alpha2
);
1786 * This restores the ieee80211_regdom module parameter
1787 * preference or the last user requested regulatory
1788 * settings, user regulatory settings takes precedence.
1790 if (is_an_alpha2(alpha2
))
1791 regulatory_hint_user(user_alpha2
);
1795 void regulatory_hint_disconnect(void)
1797 REG_DBG_PRINT("All devices are disconnected, going to "
1798 "restore regulatory settings\n");
1799 restore_regulatory_settings(false);
1802 static bool freq_is_chan_12_13_14(u16 freq
)
1804 if (freq
== ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ
) ||
1805 freq
== ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ
) ||
1806 freq
== ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ
))
1811 int regulatory_hint_found_beacon(struct wiphy
*wiphy
,
1812 struct ieee80211_channel
*beacon_chan
,
1815 struct reg_beacon
*reg_beacon
;
1817 if (likely((beacon_chan
->beacon_found
||
1818 (beacon_chan
->flags
& IEEE80211_CHAN_RADAR
) ||
1819 (beacon_chan
->band
== IEEE80211_BAND_2GHZ
&&
1820 !freq_is_chan_12_13_14(beacon_chan
->center_freq
)))))
1823 reg_beacon
= kzalloc(sizeof(struct reg_beacon
), gfp
);
1827 REG_DBG_PRINT("Found new beacon on "
1828 "frequency: %d MHz (Ch %d) on %s\n",
1829 beacon_chan
->center_freq
,
1830 ieee80211_frequency_to_channel(beacon_chan
->center_freq
),
1833 memcpy(®_beacon
->chan
, beacon_chan
,
1834 sizeof(struct ieee80211_channel
));
1838 * Since we can be called from BH or and non-BH context
1839 * we must use spin_lock_bh()
1841 spin_lock_bh(®_pending_beacons_lock
);
1842 list_add_tail(®_beacon
->list
, ®_pending_beacons
);
1843 spin_unlock_bh(®_pending_beacons_lock
);
1845 schedule_work(®_work
);
1850 static void print_rd_rules(const struct ieee80211_regdomain
*rd
)
1853 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
1854 const struct ieee80211_freq_range
*freq_range
= NULL
;
1855 const struct ieee80211_power_rule
*power_rule
= NULL
;
1857 pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp)\n");
1859 for (i
= 0; i
< rd
->n_reg_rules
; i
++) {
1860 reg_rule
= &rd
->reg_rules
[i
];
1861 freq_range
= ®_rule
->freq_range
;
1862 power_rule
= ®_rule
->power_rule
;
1865 * There may not be documentation for max antenna gain
1866 * in certain regions
1868 if (power_rule
->max_antenna_gain
)
1869 pr_info(" (%d KHz - %d KHz @ %d KHz), (%d mBi, %d mBm)\n",
1870 freq_range
->start_freq_khz
,
1871 freq_range
->end_freq_khz
,
1872 freq_range
->max_bandwidth_khz
,
1873 power_rule
->max_antenna_gain
,
1874 power_rule
->max_eirp
);
1876 pr_info(" (%d KHz - %d KHz @ %d KHz), (N/A, %d mBm)\n",
1877 freq_range
->start_freq_khz
,
1878 freq_range
->end_freq_khz
,
1879 freq_range
->max_bandwidth_khz
,
1880 power_rule
->max_eirp
);
1884 static void print_regdomain(const struct ieee80211_regdomain
*rd
)
1887 if (is_intersected_alpha2(rd
->alpha2
)) {
1889 if (last_request
->initiator
==
1890 NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
1891 struct cfg80211_registered_device
*rdev
;
1892 rdev
= cfg80211_rdev_by_wiphy_idx(
1893 last_request
->wiphy_idx
);
1895 pr_info("Current regulatory domain updated by AP to: %c%c\n",
1896 rdev
->country_ie_alpha2
[0],
1897 rdev
->country_ie_alpha2
[1]);
1899 pr_info("Current regulatory domain intersected:\n");
1901 pr_info("Current regulatory domain intersected:\n");
1902 } else if (is_world_regdom(rd
->alpha2
))
1903 pr_info("World regulatory domain updated:\n");
1905 if (is_unknown_alpha2(rd
->alpha2
))
1906 pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n");
1908 pr_info("Regulatory domain changed to country: %c%c\n",
1909 rd
->alpha2
[0], rd
->alpha2
[1]);
1914 static void print_regdomain_info(const struct ieee80211_regdomain
*rd
)
1916 pr_info("Regulatory domain: %c%c\n", rd
->alpha2
[0], rd
->alpha2
[1]);
1920 /* Takes ownership of rd only if it doesn't fail */
1921 static int __set_regdom(const struct ieee80211_regdomain
*rd
)
1923 const struct ieee80211_regdomain
*intersected_rd
= NULL
;
1924 struct cfg80211_registered_device
*rdev
= NULL
;
1925 struct wiphy
*request_wiphy
;
1926 /* Some basic sanity checks first */
1928 if (is_world_regdom(rd
->alpha2
)) {
1929 if (WARN_ON(!reg_is_valid_request(rd
->alpha2
)))
1931 update_world_regdomain(rd
);
1935 if (!is_alpha2_set(rd
->alpha2
) && !is_an_alpha2(rd
->alpha2
) &&
1936 !is_unknown_alpha2(rd
->alpha2
))
1943 * Lets only bother proceeding on the same alpha2 if the current
1944 * rd is non static (it means CRDA was present and was used last)
1945 * and the pending request came in from a country IE
1947 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
1949 * If someone else asked us to change the rd lets only bother
1950 * checking if the alpha2 changes if CRDA was already called
1952 if (!regdom_changes(rd
->alpha2
))
1957 * Now lets set the regulatory domain, update all driver channels
1958 * and finally inform them of what we have done, in case they want
1959 * to review or adjust their own settings based on their own
1960 * internal EEPROM data
1963 if (WARN_ON(!reg_is_valid_request(rd
->alpha2
)))
1966 if (!is_valid_rd(rd
)) {
1967 pr_err("Invalid regulatory domain detected:\n");
1968 print_regdomain_info(rd
);
1972 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
1974 if (!last_request
->intersect
) {
1977 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_DRIVER
) {
1979 cfg80211_regdomain
= rd
;
1984 * For a driver hint, lets copy the regulatory domain the
1985 * driver wanted to the wiphy to deal with conflicts
1989 * Userspace could have sent two replies with only
1990 * one kernel request.
1992 if (request_wiphy
->regd
)
1995 r
= reg_copy_regd(&request_wiphy
->regd
, rd
);
2000 cfg80211_regdomain
= rd
;
2004 /* Intersection requires a bit more work */
2006 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
2008 intersected_rd
= regdom_intersect(rd
, cfg80211_regdomain
);
2009 if (!intersected_rd
)
2013 * We can trash what CRDA provided now.
2014 * However if a driver requested this specific regulatory
2015 * domain we keep it for its private use
2017 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
)
2018 request_wiphy
->regd
= rd
;
2025 cfg80211_regdomain
= intersected_rd
;
2030 if (!intersected_rd
)
2033 rdev
= wiphy_to_dev(request_wiphy
);
2035 rdev
->country_ie_alpha2
[0] = rd
->alpha2
[0];
2036 rdev
->country_ie_alpha2
[1] = rd
->alpha2
[1];
2037 rdev
->env
= last_request
->country_ie_env
;
2039 BUG_ON(intersected_rd
== rd
);
2045 cfg80211_regdomain
= intersected_rd
;
2052 * Use this call to set the current regulatory domain. Conflicts with
2053 * multiple drivers can be ironed out later. Caller must've already
2054 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
2056 int set_regdom(const struct ieee80211_regdomain
*rd
)
2060 assert_cfg80211_lock();
2062 mutex_lock(®_mutex
);
2064 /* Note that this doesn't update the wiphys, this is done below */
2065 r
= __set_regdom(rd
);
2068 mutex_unlock(®_mutex
);
2072 /* This would make this whole thing pointless */
2073 if (!last_request
->intersect
)
2074 BUG_ON(rd
!= cfg80211_regdomain
);
2076 /* update all wiphys now with the new established regulatory domain */
2077 update_all_wiphy_regulatory(last_request
->initiator
);
2079 print_regdomain(cfg80211_regdomain
);
2081 nl80211_send_reg_change_event(last_request
);
2083 reg_set_request_processed();
2085 mutex_unlock(®_mutex
);
2090 /* Caller must hold cfg80211_mutex */
2091 void reg_device_remove(struct wiphy
*wiphy
)
2093 struct wiphy
*request_wiphy
= NULL
;
2095 assert_cfg80211_lock();
2097 mutex_lock(®_mutex
);
2102 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
2104 if (!request_wiphy
|| request_wiphy
!= wiphy
)
2107 last_request
->wiphy_idx
= WIPHY_IDX_STALE
;
2108 last_request
->country_ie_env
= ENVIRON_ANY
;
2110 mutex_unlock(®_mutex
);
2113 int __init
regulatory_init(void)
2117 reg_pdev
= platform_device_register_simple("regulatory", 0, NULL
, 0);
2118 if (IS_ERR(reg_pdev
))
2119 return PTR_ERR(reg_pdev
);
2121 spin_lock_init(®_requests_lock
);
2122 spin_lock_init(®_pending_beacons_lock
);
2124 cfg80211_regdomain
= cfg80211_world_regdom
;
2126 user_alpha2
[0] = '9';
2127 user_alpha2
[1] = '7';
2129 /* We always try to get an update for the static regdomain */
2130 err
= regulatory_hint_core(cfg80211_regdomain
->alpha2
);
2135 * N.B. kobject_uevent_env() can fail mainly for when we're out
2136 * memory which is handled and propagated appropriately above
2137 * but it can also fail during a netlink_broadcast() or during
2138 * early boot for call_usermodehelper(). For now treat these
2139 * errors as non-fatal.
2141 pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
2142 #ifdef CONFIG_CFG80211_REG_DEBUG
2143 /* We want to find out exactly why when debugging */
2149 * Finally, if the user set the module parameter treat it
2152 if (!is_world_regdom(ieee80211_regdom
))
2153 regulatory_hint_user(ieee80211_regdom
);
2158 void /* __init_or_exit */ regulatory_exit(void)
2160 struct regulatory_request
*reg_request
, *tmp
;
2161 struct reg_beacon
*reg_beacon
, *btmp
;
2163 cancel_work_sync(®_work
);
2165 mutex_lock(&cfg80211_mutex
);
2166 mutex_lock(®_mutex
);
2170 kfree(last_request
);
2172 platform_device_unregister(reg_pdev
);
2174 spin_lock_bh(®_pending_beacons_lock
);
2175 if (!list_empty(®_pending_beacons
)) {
2176 list_for_each_entry_safe(reg_beacon
, btmp
,
2177 ®_pending_beacons
, list
) {
2178 list_del(®_beacon
->list
);
2182 spin_unlock_bh(®_pending_beacons_lock
);
2184 if (!list_empty(®_beacon_list
)) {
2185 list_for_each_entry_safe(reg_beacon
, btmp
,
2186 ®_beacon_list
, list
) {
2187 list_del(®_beacon
->list
);
2192 spin_lock(®_requests_lock
);
2193 if (!list_empty(®_requests_list
)) {
2194 list_for_each_entry_safe(reg_request
, tmp
,
2195 ®_requests_list
, list
) {
2196 list_del(®_request
->list
);
2200 spin_unlock(®_requests_lock
);
2202 mutex_unlock(®_mutex
);
2203 mutex_unlock(&cfg80211_mutex
);