2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
5 * Copyright 2008-2011 Luis R. Rodriguez <mcgrof@qca.qualcomm.com>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
8 * Permission to use, copy, modify, and/or distribute this software for any
9 * purpose with or without fee is hereby granted, provided that the above
10 * copyright notice and this permission notice appear in all copies.
12 * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
13 * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
14 * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
15 * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
16 * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
17 * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
18 * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
23 * DOC: Wireless regulatory infrastructure
25 * The usual implementation is for a driver to read a device EEPROM to
26 * determine which regulatory domain it should be operating under, then
27 * looking up the allowable channels in a driver-local table and finally
28 * registering those channels in the wiphy structure.
30 * Another set of compliance enforcement is for drivers to use their
31 * own compliance limits which can be stored on the EEPROM. The host
32 * driver or firmware may ensure these are used.
34 * In addition to all this we provide an extra layer of regulatory
35 * conformance. For drivers which do not have any regulatory
36 * information CRDA provides the complete regulatory solution.
37 * For others it provides a community effort on further restrictions
38 * to enhance compliance.
40 * Note: When number of rules --> infinity we will not be able to
41 * index on alpha2 any more, instead we'll probably have to
42 * rely on some SHA1 checksum of the regdomain for example.
46 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
48 #include <linux/kernel.h>
49 #include <linux/export.h>
50 #include <linux/slab.h>
51 #include <linux/list.h>
52 #include <linux/ctype.h>
53 #include <linux/nl80211.h>
54 #include <linux/platform_device.h>
55 #include <linux/moduleparam.h>
56 #include <net/cfg80211.h>
63 #ifdef CONFIG_CFG80211_REG_DEBUG
64 #define REG_DBG_PRINT(format, args...) \
65 printk(KERN_DEBUG pr_fmt(format), ##args)
67 #define REG_DBG_PRINT(args...)
71 * Grace period we give before making sure all current interfaces reside on
72 * channels allowed by the current regulatory domain.
74 #define REG_ENFORCE_GRACE_MS 60000
77 * enum reg_request_treatment - regulatory request treatment
79 * @REG_REQ_OK: continue processing the regulatory request
80 * @REG_REQ_IGNORE: ignore the regulatory request
81 * @REG_REQ_INTERSECT: the regulatory domain resulting from this request should
82 * be intersected with the current one.
83 * @REG_REQ_ALREADY_SET: the regulatory request will not change the current
84 * regulatory settings, and no further processing is required.
85 * @REG_REQ_USER_HINT_HANDLED: a non alpha2 user hint was handled and no
86 * further processing is required, i.e., not need to update last_request
87 * etc. This should be used for user hints that do not provide an alpha2
88 * but some other type of regulatory hint, i.e., indoor operation.
90 enum reg_request_treatment
{
95 REG_REQ_USER_HINT_HANDLED
,
98 static struct regulatory_request core_request_world
= {
99 .initiator
= NL80211_REGDOM_SET_BY_CORE
,
104 .country_ie_env
= ENVIRON_ANY
,
108 * Receipt of information from last regulatory request,
109 * protected by RTNL (and can be accessed with RCU protection)
111 static struct regulatory_request __rcu
*last_request
=
112 (void __rcu
*)&core_request_world
;
114 /* To trigger userspace events */
115 static struct platform_device
*reg_pdev
;
118 * Central wireless core regulatory domains, we only need two,
119 * the current one and a world regulatory domain in case we have no
120 * information to give us an alpha2.
121 * (protected by RTNL, can be read under RCU)
123 const struct ieee80211_regdomain __rcu
*cfg80211_regdomain
;
126 * Number of devices that registered to the core
127 * that support cellular base station regulatory hints
128 * (protected by RTNL)
130 static int reg_num_devs_support_basehint
;
133 * State variable indicating if the platform on which the devices
134 * are attached is operating in an indoor environment. The state variable
135 * is relevant for all registered devices.
136 * (protected by RTNL)
138 static bool reg_is_indoor
;
140 static const struct ieee80211_regdomain
*get_cfg80211_regdom(void)
142 return rtnl_dereference(cfg80211_regdomain
);
145 static const struct ieee80211_regdomain
*get_wiphy_regdom(struct wiphy
*wiphy
)
147 return rtnl_dereference(wiphy
->regd
);
150 static const char *reg_dfs_region_str(enum nl80211_dfs_regions dfs_region
)
152 switch (dfs_region
) {
153 case NL80211_DFS_UNSET
:
155 case NL80211_DFS_FCC
:
157 case NL80211_DFS_ETSI
:
165 enum nl80211_dfs_regions
reg_get_dfs_region(struct wiphy
*wiphy
)
167 const struct ieee80211_regdomain
*regd
= NULL
;
168 const struct ieee80211_regdomain
*wiphy_regd
= NULL
;
170 regd
= get_cfg80211_regdom();
174 wiphy_regd
= get_wiphy_regdom(wiphy
);
178 if (wiphy_regd
->dfs_region
== regd
->dfs_region
)
181 REG_DBG_PRINT("%s: device specific dfs_region "
182 "(%s) disagrees with cfg80211's "
183 "central dfs_region (%s)\n",
184 dev_name(&wiphy
->dev
),
185 reg_dfs_region_str(wiphy_regd
->dfs_region
),
186 reg_dfs_region_str(regd
->dfs_region
));
189 return regd
->dfs_region
;
192 static void rcu_free_regdom(const struct ieee80211_regdomain
*r
)
196 kfree_rcu((struct ieee80211_regdomain
*)r
, rcu_head
);
199 static struct regulatory_request
*get_last_request(void)
201 return rcu_dereference_rtnl(last_request
);
204 /* Used to queue up regulatory hints */
205 static LIST_HEAD(reg_requests_list
);
206 static spinlock_t reg_requests_lock
;
208 /* Used to queue up beacon hints for review */
209 static LIST_HEAD(reg_pending_beacons
);
210 static spinlock_t reg_pending_beacons_lock
;
212 /* Used to keep track of processed beacon hints */
213 static LIST_HEAD(reg_beacon_list
);
216 struct list_head list
;
217 struct ieee80211_channel chan
;
220 static void reg_check_chans_work(struct work_struct
*work
);
221 static DECLARE_DELAYED_WORK(reg_check_chans
, reg_check_chans_work
);
223 static void reg_todo(struct work_struct
*work
);
224 static DECLARE_WORK(reg_work
, reg_todo
);
226 static void reg_timeout_work(struct work_struct
*work
);
227 static DECLARE_DELAYED_WORK(reg_timeout
, reg_timeout_work
);
229 /* We keep a static world regulatory domain in case of the absence of CRDA */
230 static const struct ieee80211_regdomain world_regdom
= {
234 /* IEEE 802.11b/g, channels 1..11 */
235 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
236 /* IEEE 802.11b/g, channels 12..13. */
237 REG_RULE(2467-10, 2472+10, 40, 6, 20,
239 /* IEEE 802.11 channel 14 - Only JP enables
240 * this and for 802.11b only */
241 REG_RULE(2484-10, 2484+10, 20, 6, 20,
243 NL80211_RRF_NO_OFDM
),
244 /* IEEE 802.11a, channel 36..48 */
245 REG_RULE(5180-10, 5240+10, 160, 6, 20,
248 /* IEEE 802.11a, channel 52..64 - DFS required */
249 REG_RULE(5260-10, 5320+10, 160, 6, 20,
253 /* IEEE 802.11a, channel 100..144 - DFS required */
254 REG_RULE(5500-10, 5720+10, 160, 6, 20,
258 /* IEEE 802.11a, channel 149..165 */
259 REG_RULE(5745-10, 5825+10, 80, 6, 20,
262 /* IEEE 802.11ad (60gHz), channels 1..3 */
263 REG_RULE(56160+2160*1-1080, 56160+2160*3+1080, 2160, 0, 0, 0),
267 /* protected by RTNL */
268 static const struct ieee80211_regdomain
*cfg80211_world_regdom
=
271 static char *ieee80211_regdom
= "00";
272 static char user_alpha2
[2];
274 module_param(ieee80211_regdom
, charp
, 0444);
275 MODULE_PARM_DESC(ieee80211_regdom
, "IEEE 802.11 regulatory domain code");
277 static void reg_free_request(struct regulatory_request
*request
)
279 if (request
!= get_last_request())
283 static void reg_free_last_request(void)
285 struct regulatory_request
*lr
= get_last_request();
287 if (lr
!= &core_request_world
&& lr
)
288 kfree_rcu(lr
, rcu_head
);
291 static void reg_update_last_request(struct regulatory_request
*request
)
293 struct regulatory_request
*lr
;
295 lr
= get_last_request();
299 reg_free_last_request();
300 rcu_assign_pointer(last_request
, request
);
303 static void reset_regdomains(bool full_reset
,
304 const struct ieee80211_regdomain
*new_regdom
)
306 const struct ieee80211_regdomain
*r
;
310 r
= get_cfg80211_regdom();
312 /* avoid freeing static information or freeing something twice */
313 if (r
== cfg80211_world_regdom
)
315 if (cfg80211_world_regdom
== &world_regdom
)
316 cfg80211_world_regdom
= NULL
;
317 if (r
== &world_regdom
)
321 rcu_free_regdom(cfg80211_world_regdom
);
323 cfg80211_world_regdom
= &world_regdom
;
324 rcu_assign_pointer(cfg80211_regdomain
, new_regdom
);
329 reg_update_last_request(&core_request_world
);
333 * Dynamic world regulatory domain requested by the wireless
334 * core upon initialization
336 static void update_world_regdomain(const struct ieee80211_regdomain
*rd
)
338 struct regulatory_request
*lr
;
340 lr
= get_last_request();
344 reset_regdomains(false, rd
);
346 cfg80211_world_regdom
= rd
;
349 bool is_world_regdom(const char *alpha2
)
353 return alpha2
[0] == '0' && alpha2
[1] == '0';
356 static bool is_alpha2_set(const char *alpha2
)
360 return alpha2
[0] && alpha2
[1];
363 static bool is_unknown_alpha2(const char *alpha2
)
368 * Special case where regulatory domain was built by driver
369 * but a specific alpha2 cannot be determined
371 return alpha2
[0] == '9' && alpha2
[1] == '9';
374 static bool is_intersected_alpha2(const char *alpha2
)
379 * Special case where regulatory domain is the
380 * result of an intersection between two regulatory domain
383 return alpha2
[0] == '9' && alpha2
[1] == '8';
386 static bool is_an_alpha2(const char *alpha2
)
390 return isalpha(alpha2
[0]) && isalpha(alpha2
[1]);
393 static bool alpha2_equal(const char *alpha2_x
, const char *alpha2_y
)
395 if (!alpha2_x
|| !alpha2_y
)
397 return alpha2_x
[0] == alpha2_y
[0] && alpha2_x
[1] == alpha2_y
[1];
400 static bool regdom_changes(const char *alpha2
)
402 const struct ieee80211_regdomain
*r
= get_cfg80211_regdom();
406 return !alpha2_equal(r
->alpha2
, alpha2
);
410 * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
411 * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
412 * has ever been issued.
414 static bool is_user_regdom_saved(void)
416 if (user_alpha2
[0] == '9' && user_alpha2
[1] == '7')
419 /* This would indicate a mistake on the design */
420 if (WARN(!is_world_regdom(user_alpha2
) && !is_an_alpha2(user_alpha2
),
421 "Unexpected user alpha2: %c%c\n",
422 user_alpha2
[0], user_alpha2
[1]))
428 static const struct ieee80211_regdomain
*
429 reg_copy_regd(const struct ieee80211_regdomain
*src_regd
)
431 struct ieee80211_regdomain
*regd
;
436 sizeof(struct ieee80211_regdomain
) +
437 src_regd
->n_reg_rules
* sizeof(struct ieee80211_reg_rule
);
439 regd
= kzalloc(size_of_regd
, GFP_KERNEL
);
441 return ERR_PTR(-ENOMEM
);
443 memcpy(regd
, src_regd
, sizeof(struct ieee80211_regdomain
));
445 for (i
= 0; i
< src_regd
->n_reg_rules
; i
++)
446 memcpy(®d
->reg_rules
[i
], &src_regd
->reg_rules
[i
],
447 sizeof(struct ieee80211_reg_rule
));
452 #ifdef CONFIG_CFG80211_INTERNAL_REGDB
453 struct reg_regdb_search_request
{
455 struct list_head list
;
458 static LIST_HEAD(reg_regdb_search_list
);
459 static DEFINE_MUTEX(reg_regdb_search_mutex
);
461 static void reg_regdb_search(struct work_struct
*work
)
463 struct reg_regdb_search_request
*request
;
464 const struct ieee80211_regdomain
*curdom
, *regdom
= NULL
;
469 mutex_lock(®_regdb_search_mutex
);
470 while (!list_empty(®_regdb_search_list
)) {
471 request
= list_first_entry(®_regdb_search_list
,
472 struct reg_regdb_search_request
,
474 list_del(&request
->list
);
476 for (i
= 0; i
< reg_regdb_size
; i
++) {
477 curdom
= reg_regdb
[i
];
479 if (alpha2_equal(request
->alpha2
, curdom
->alpha2
)) {
480 regdom
= reg_copy_regd(curdom
);
487 mutex_unlock(®_regdb_search_mutex
);
489 if (!IS_ERR_OR_NULL(regdom
))
495 static DECLARE_WORK(reg_regdb_work
, reg_regdb_search
);
497 static void reg_regdb_query(const char *alpha2
)
499 struct reg_regdb_search_request
*request
;
504 request
= kzalloc(sizeof(struct reg_regdb_search_request
), GFP_KERNEL
);
508 memcpy(request
->alpha2
, alpha2
, 2);
510 mutex_lock(®_regdb_search_mutex
);
511 list_add_tail(&request
->list
, ®_regdb_search_list
);
512 mutex_unlock(®_regdb_search_mutex
);
514 schedule_work(®_regdb_work
);
517 /* Feel free to add any other sanity checks here */
518 static void reg_regdb_size_check(void)
520 /* We should ideally BUILD_BUG_ON() but then random builds would fail */
521 WARN_ONCE(!reg_regdb_size
, "db.txt is empty, you should update it...");
524 static inline void reg_regdb_size_check(void) {}
525 static inline void reg_regdb_query(const char *alpha2
) {}
526 #endif /* CONFIG_CFG80211_INTERNAL_REGDB */
529 * This lets us keep regulatory code which is updated on a regulatory
530 * basis in userspace.
532 static int call_crda(const char *alpha2
)
535 char *env
[] = { country
, NULL
};
537 snprintf(country
, sizeof(country
), "COUNTRY=%c%c",
538 alpha2
[0], alpha2
[1]);
540 if (!is_world_regdom((char *) alpha2
))
541 pr_info("Calling CRDA for country: %c%c\n",
542 alpha2
[0], alpha2
[1]);
544 pr_info("Calling CRDA to update world regulatory domain\n");
546 /* query internal regulatory database (if it exists) */
547 reg_regdb_query(alpha2
);
549 return kobject_uevent_env(®_pdev
->dev
.kobj
, KOBJ_CHANGE
, env
);
552 static enum reg_request_treatment
553 reg_call_crda(struct regulatory_request
*request
)
555 if (call_crda(request
->alpha2
))
556 return REG_REQ_IGNORE
;
560 bool reg_is_valid_request(const char *alpha2
)
562 struct regulatory_request
*lr
= get_last_request();
564 if (!lr
|| lr
->processed
)
567 return alpha2_equal(lr
->alpha2
, alpha2
);
570 static const struct ieee80211_regdomain
*reg_get_regdomain(struct wiphy
*wiphy
)
572 struct regulatory_request
*lr
= get_last_request();
575 * Follow the driver's regulatory domain, if present, unless a country
576 * IE has been processed or a user wants to help complaince further
578 if (lr
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
579 lr
->initiator
!= NL80211_REGDOM_SET_BY_USER
&&
581 return get_wiphy_regdom(wiphy
);
583 return get_cfg80211_regdom();
587 reg_get_max_bandwidth_from_range(const struct ieee80211_regdomain
*rd
,
588 const struct ieee80211_reg_rule
*rule
)
590 const struct ieee80211_freq_range
*freq_range
= &rule
->freq_range
;
591 const struct ieee80211_freq_range
*freq_range_tmp
;
592 const struct ieee80211_reg_rule
*tmp
;
593 u32 start_freq
, end_freq
, idx
, no
;
595 for (idx
= 0; idx
< rd
->n_reg_rules
; idx
++)
596 if (rule
== &rd
->reg_rules
[idx
])
599 if (idx
== rd
->n_reg_rules
)
606 tmp
= &rd
->reg_rules
[--no
];
607 freq_range_tmp
= &tmp
->freq_range
;
609 if (freq_range_tmp
->end_freq_khz
< freq_range
->start_freq_khz
)
612 freq_range
= freq_range_tmp
;
615 start_freq
= freq_range
->start_freq_khz
;
618 freq_range
= &rule
->freq_range
;
621 while (no
< rd
->n_reg_rules
- 1) {
622 tmp
= &rd
->reg_rules
[++no
];
623 freq_range_tmp
= &tmp
->freq_range
;
625 if (freq_range_tmp
->start_freq_khz
> freq_range
->end_freq_khz
)
628 freq_range
= freq_range_tmp
;
631 end_freq
= freq_range
->end_freq_khz
;
633 return end_freq
- start_freq
;
636 unsigned int reg_get_max_bandwidth(const struct ieee80211_regdomain
*rd
,
637 const struct ieee80211_reg_rule
*rule
)
639 unsigned int bw
= reg_get_max_bandwidth_from_range(rd
, rule
);
641 if (rule
->flags
& NL80211_RRF_NO_160MHZ
)
642 bw
= min_t(unsigned int, bw
, MHZ_TO_KHZ(80));
643 if (rule
->flags
& NL80211_RRF_NO_80MHZ
)
644 bw
= min_t(unsigned int, bw
, MHZ_TO_KHZ(40));
647 * HT40+/HT40- limits are handled per-channel. Only limit BW if both
650 if (rule
->flags
& NL80211_RRF_NO_HT40MINUS
&&
651 rule
->flags
& NL80211_RRF_NO_HT40PLUS
)
652 bw
= min_t(unsigned int, bw
, MHZ_TO_KHZ(20));
657 /* Sanity check on a regulatory rule */
658 static bool is_valid_reg_rule(const struct ieee80211_reg_rule
*rule
)
660 const struct ieee80211_freq_range
*freq_range
= &rule
->freq_range
;
663 if (freq_range
->start_freq_khz
<= 0 || freq_range
->end_freq_khz
<= 0)
666 if (freq_range
->start_freq_khz
> freq_range
->end_freq_khz
)
669 freq_diff
= freq_range
->end_freq_khz
- freq_range
->start_freq_khz
;
671 if (freq_range
->end_freq_khz
<= freq_range
->start_freq_khz
||
672 freq_range
->max_bandwidth_khz
> freq_diff
)
678 static bool is_valid_rd(const struct ieee80211_regdomain
*rd
)
680 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
683 if (!rd
->n_reg_rules
)
686 if (WARN_ON(rd
->n_reg_rules
> NL80211_MAX_SUPP_REG_RULES
))
689 for (i
= 0; i
< rd
->n_reg_rules
; i
++) {
690 reg_rule
= &rd
->reg_rules
[i
];
691 if (!is_valid_reg_rule(reg_rule
))
698 static bool reg_does_bw_fit(const struct ieee80211_freq_range
*freq_range
,
699 u32 center_freq_khz
, u32 bw_khz
)
701 u32 start_freq_khz
, end_freq_khz
;
703 start_freq_khz
= center_freq_khz
- (bw_khz
/2);
704 end_freq_khz
= center_freq_khz
+ (bw_khz
/2);
706 if (start_freq_khz
>= freq_range
->start_freq_khz
&&
707 end_freq_khz
<= freq_range
->end_freq_khz
)
714 * freq_in_rule_band - tells us if a frequency is in a frequency band
715 * @freq_range: frequency rule we want to query
716 * @freq_khz: frequency we are inquiring about
718 * This lets us know if a specific frequency rule is or is not relevant to
719 * a specific frequency's band. Bands are device specific and artificial
720 * definitions (the "2.4 GHz band", the "5 GHz band" and the "60GHz band"),
721 * however it is safe for now to assume that a frequency rule should not be
722 * part of a frequency's band if the start freq or end freq are off by more
723 * than 2 GHz for the 2.4 and 5 GHz bands, and by more than 10 GHz for the
725 * This resolution can be lowered and should be considered as we add
726 * regulatory rule support for other "bands".
728 static bool freq_in_rule_band(const struct ieee80211_freq_range
*freq_range
,
731 #define ONE_GHZ_IN_KHZ 1000000
733 * From 802.11ad: directional multi-gigabit (DMG):
734 * Pertaining to operation in a frequency band containing a channel
735 * with the Channel starting frequency above 45 GHz.
737 u32 limit
= freq_khz
> 45 * ONE_GHZ_IN_KHZ
?
738 10 * ONE_GHZ_IN_KHZ
: 2 * ONE_GHZ_IN_KHZ
;
739 if (abs(freq_khz
- freq_range
->start_freq_khz
) <= limit
)
741 if (abs(freq_khz
- freq_range
->end_freq_khz
) <= limit
)
744 #undef ONE_GHZ_IN_KHZ
748 * Later on we can perhaps use the more restrictive DFS
749 * region but we don't have information for that yet so
750 * for now simply disallow conflicts.
752 static enum nl80211_dfs_regions
753 reg_intersect_dfs_region(const enum nl80211_dfs_regions dfs_region1
,
754 const enum nl80211_dfs_regions dfs_region2
)
756 if (dfs_region1
!= dfs_region2
)
757 return NL80211_DFS_UNSET
;
762 * Helper for regdom_intersect(), this does the real
763 * mathematical intersection fun
765 static int reg_rules_intersect(const struct ieee80211_regdomain
*rd1
,
766 const struct ieee80211_regdomain
*rd2
,
767 const struct ieee80211_reg_rule
*rule1
,
768 const struct ieee80211_reg_rule
*rule2
,
769 struct ieee80211_reg_rule
*intersected_rule
)
771 const struct ieee80211_freq_range
*freq_range1
, *freq_range2
;
772 struct ieee80211_freq_range
*freq_range
;
773 const struct ieee80211_power_rule
*power_rule1
, *power_rule2
;
774 struct ieee80211_power_rule
*power_rule
;
775 u32 freq_diff
, max_bandwidth1
, max_bandwidth2
;
777 freq_range1
= &rule1
->freq_range
;
778 freq_range2
= &rule2
->freq_range
;
779 freq_range
= &intersected_rule
->freq_range
;
781 power_rule1
= &rule1
->power_rule
;
782 power_rule2
= &rule2
->power_rule
;
783 power_rule
= &intersected_rule
->power_rule
;
785 freq_range
->start_freq_khz
= max(freq_range1
->start_freq_khz
,
786 freq_range2
->start_freq_khz
);
787 freq_range
->end_freq_khz
= min(freq_range1
->end_freq_khz
,
788 freq_range2
->end_freq_khz
);
790 max_bandwidth1
= freq_range1
->max_bandwidth_khz
;
791 max_bandwidth2
= freq_range2
->max_bandwidth_khz
;
793 if (rule1
->flags
& NL80211_RRF_AUTO_BW
)
794 max_bandwidth1
= reg_get_max_bandwidth(rd1
, rule1
);
795 if (rule2
->flags
& NL80211_RRF_AUTO_BW
)
796 max_bandwidth2
= reg_get_max_bandwidth(rd2
, rule2
);
798 freq_range
->max_bandwidth_khz
= min(max_bandwidth1
, max_bandwidth2
);
800 intersected_rule
->flags
= rule1
->flags
| rule2
->flags
;
803 * In case NL80211_RRF_AUTO_BW requested for both rules
804 * set AUTO_BW in intersected rule also. Next we will
805 * calculate BW correctly in handle_channel function.
806 * In other case remove AUTO_BW flag while we calculate
807 * maximum bandwidth correctly and auto calculation is
810 if ((rule1
->flags
& NL80211_RRF_AUTO_BW
) &&
811 (rule2
->flags
& NL80211_RRF_AUTO_BW
))
812 intersected_rule
->flags
|= NL80211_RRF_AUTO_BW
;
814 intersected_rule
->flags
&= ~NL80211_RRF_AUTO_BW
;
816 freq_diff
= freq_range
->end_freq_khz
- freq_range
->start_freq_khz
;
817 if (freq_range
->max_bandwidth_khz
> freq_diff
)
818 freq_range
->max_bandwidth_khz
= freq_diff
;
820 power_rule
->max_eirp
= min(power_rule1
->max_eirp
,
821 power_rule2
->max_eirp
);
822 power_rule
->max_antenna_gain
= min(power_rule1
->max_antenna_gain
,
823 power_rule2
->max_antenna_gain
);
825 intersected_rule
->dfs_cac_ms
= max(rule1
->dfs_cac_ms
,
828 if (!is_valid_reg_rule(intersected_rule
))
834 /* check whether old rule contains new rule */
835 static bool rule_contains(struct ieee80211_reg_rule
*r1
,
836 struct ieee80211_reg_rule
*r2
)
838 /* for simplicity, currently consider only same flags */
839 if (r1
->flags
!= r2
->flags
)
842 /* verify r1 is more restrictive */
843 if ((r1
->power_rule
.max_antenna_gain
>
844 r2
->power_rule
.max_antenna_gain
) ||
845 r1
->power_rule
.max_eirp
> r2
->power_rule
.max_eirp
)
848 /* make sure r2's range is contained within r1 */
849 if (r1
->freq_range
.start_freq_khz
> r2
->freq_range
.start_freq_khz
||
850 r1
->freq_range
.end_freq_khz
< r2
->freq_range
.end_freq_khz
)
853 /* and finally verify that r1.max_bw >= r2.max_bw */
854 if (r1
->freq_range
.max_bandwidth_khz
<
855 r2
->freq_range
.max_bandwidth_khz
)
861 /* add or extend current rules. do nothing if rule is already contained */
862 static void add_rule(struct ieee80211_reg_rule
*rule
,
863 struct ieee80211_reg_rule
*reg_rules
, u32
*n_rules
)
865 struct ieee80211_reg_rule
*tmp_rule
;
868 for (i
= 0; i
< *n_rules
; i
++) {
869 tmp_rule
= ®_rules
[i
];
870 /* rule is already contained - do nothing */
871 if (rule_contains(tmp_rule
, rule
))
874 /* extend rule if possible */
875 if (rule_contains(rule
, tmp_rule
)) {
876 memcpy(tmp_rule
, rule
, sizeof(*rule
));
881 memcpy(®_rules
[*n_rules
], rule
, sizeof(*rule
));
886 * regdom_intersect - do the intersection between two regulatory domains
887 * @rd1: first regulatory domain
888 * @rd2: second regulatory domain
890 * Use this function to get the intersection between two regulatory domains.
891 * Once completed we will mark the alpha2 for the rd as intersected, "98",
892 * as no one single alpha2 can represent this regulatory domain.
894 * Returns a pointer to the regulatory domain structure which will hold the
895 * resulting intersection of rules between rd1 and rd2. We will
896 * kzalloc() this structure for you.
898 static struct ieee80211_regdomain
*
899 regdom_intersect(const struct ieee80211_regdomain
*rd1
,
900 const struct ieee80211_regdomain
*rd2
)
904 unsigned int num_rules
= 0;
905 const struct ieee80211_reg_rule
*rule1
, *rule2
;
906 struct ieee80211_reg_rule intersected_rule
;
907 struct ieee80211_regdomain
*rd
;
913 * First we get a count of the rules we'll need, then we actually
914 * build them. This is to so we can malloc() and free() a
915 * regdomain once. The reason we use reg_rules_intersect() here
916 * is it will return -EINVAL if the rule computed makes no sense.
917 * All rules that do check out OK are valid.
920 for (x
= 0; x
< rd1
->n_reg_rules
; x
++) {
921 rule1
= &rd1
->reg_rules
[x
];
922 for (y
= 0; y
< rd2
->n_reg_rules
; y
++) {
923 rule2
= &rd2
->reg_rules
[y
];
924 if (!reg_rules_intersect(rd1
, rd2
, rule1
, rule2
,
933 size_of_regd
= sizeof(struct ieee80211_regdomain
) +
934 num_rules
* sizeof(struct ieee80211_reg_rule
);
936 rd
= kzalloc(size_of_regd
, GFP_KERNEL
);
940 for (x
= 0; x
< rd1
->n_reg_rules
; x
++) {
941 rule1
= &rd1
->reg_rules
[x
];
942 for (y
= 0; y
< rd2
->n_reg_rules
; y
++) {
943 rule2
= &rd2
->reg_rules
[y
];
944 r
= reg_rules_intersect(rd1
, rd2
, rule1
, rule2
,
947 * No need to memset here the intersected rule here as
948 * we're not using the stack anymore
953 add_rule(&intersected_rule
, rd
->reg_rules
,
960 rd
->dfs_region
= reg_intersect_dfs_region(rd1
->dfs_region
,
967 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
968 * want to just have the channel structure use these
970 static u32
map_regdom_flags(u32 rd_flags
)
972 u32 channel_flags
= 0;
973 if (rd_flags
& NL80211_RRF_NO_IR_ALL
)
974 channel_flags
|= IEEE80211_CHAN_NO_IR
;
975 if (rd_flags
& NL80211_RRF_DFS
)
976 channel_flags
|= IEEE80211_CHAN_RADAR
;
977 if (rd_flags
& NL80211_RRF_NO_OFDM
)
978 channel_flags
|= IEEE80211_CHAN_NO_OFDM
;
979 if (rd_flags
& NL80211_RRF_NO_OUTDOOR
)
980 channel_flags
|= IEEE80211_CHAN_INDOOR_ONLY
;
981 if (rd_flags
& NL80211_RRF_GO_CONCURRENT
)
982 channel_flags
|= IEEE80211_CHAN_GO_CONCURRENT
;
983 if (rd_flags
& NL80211_RRF_NO_HT40MINUS
)
984 channel_flags
|= IEEE80211_CHAN_NO_HT40MINUS
;
985 if (rd_flags
& NL80211_RRF_NO_HT40PLUS
)
986 channel_flags
|= IEEE80211_CHAN_NO_HT40PLUS
;
987 if (rd_flags
& NL80211_RRF_NO_80MHZ
)
988 channel_flags
|= IEEE80211_CHAN_NO_80MHZ
;
989 if (rd_flags
& NL80211_RRF_NO_160MHZ
)
990 channel_flags
|= IEEE80211_CHAN_NO_160MHZ
;
991 return channel_flags
;
994 static const struct ieee80211_reg_rule
*
995 freq_reg_info_regd(struct wiphy
*wiphy
, u32 center_freq
,
996 const struct ieee80211_regdomain
*regd
)
999 bool band_rule_found
= false;
1000 bool bw_fits
= false;
1003 return ERR_PTR(-EINVAL
);
1005 for (i
= 0; i
< regd
->n_reg_rules
; i
++) {
1006 const struct ieee80211_reg_rule
*rr
;
1007 const struct ieee80211_freq_range
*fr
= NULL
;
1009 rr
= ®d
->reg_rules
[i
];
1010 fr
= &rr
->freq_range
;
1013 * We only need to know if one frequency rule was
1014 * was in center_freq's band, that's enough, so lets
1015 * not overwrite it once found
1017 if (!band_rule_found
)
1018 band_rule_found
= freq_in_rule_band(fr
, center_freq
);
1020 bw_fits
= reg_does_bw_fit(fr
, center_freq
, MHZ_TO_KHZ(20));
1022 if (band_rule_found
&& bw_fits
)
1026 if (!band_rule_found
)
1027 return ERR_PTR(-ERANGE
);
1029 return ERR_PTR(-EINVAL
);
1032 const struct ieee80211_reg_rule
*freq_reg_info(struct wiphy
*wiphy
,
1035 const struct ieee80211_regdomain
*regd
;
1037 regd
= reg_get_regdomain(wiphy
);
1039 return freq_reg_info_regd(wiphy
, center_freq
, regd
);
1041 EXPORT_SYMBOL(freq_reg_info
);
1043 const char *reg_initiator_name(enum nl80211_reg_initiator initiator
)
1045 switch (initiator
) {
1046 case NL80211_REGDOM_SET_BY_CORE
:
1048 case NL80211_REGDOM_SET_BY_USER
:
1050 case NL80211_REGDOM_SET_BY_DRIVER
:
1052 case NL80211_REGDOM_SET_BY_COUNTRY_IE
:
1053 return "country IE";
1059 EXPORT_SYMBOL(reg_initiator_name
);
1061 #ifdef CONFIG_CFG80211_REG_DEBUG
1062 static void chan_reg_rule_print_dbg(const struct ieee80211_regdomain
*regd
,
1063 struct ieee80211_channel
*chan
,
1064 const struct ieee80211_reg_rule
*reg_rule
)
1066 const struct ieee80211_power_rule
*power_rule
;
1067 const struct ieee80211_freq_range
*freq_range
;
1068 char max_antenna_gain
[32], bw
[32];
1070 power_rule
= ®_rule
->power_rule
;
1071 freq_range
= ®_rule
->freq_range
;
1073 if (!power_rule
->max_antenna_gain
)
1074 snprintf(max_antenna_gain
, sizeof(max_antenna_gain
), "N/A");
1076 snprintf(max_antenna_gain
, sizeof(max_antenna_gain
), "%d",
1077 power_rule
->max_antenna_gain
);
1079 if (reg_rule
->flags
& NL80211_RRF_AUTO_BW
)
1080 snprintf(bw
, sizeof(bw
), "%d KHz, %d KHz AUTO",
1081 freq_range
->max_bandwidth_khz
,
1082 reg_get_max_bandwidth(regd
, reg_rule
));
1084 snprintf(bw
, sizeof(bw
), "%d KHz",
1085 freq_range
->max_bandwidth_khz
);
1087 REG_DBG_PRINT("Updating information on frequency %d MHz with regulatory rule:\n",
1090 REG_DBG_PRINT("%d KHz - %d KHz @ %s), (%s mBi, %d mBm)\n",
1091 freq_range
->start_freq_khz
, freq_range
->end_freq_khz
,
1092 bw
, max_antenna_gain
,
1093 power_rule
->max_eirp
);
1096 static void chan_reg_rule_print_dbg(const struct ieee80211_regdomain
*regd
,
1097 struct ieee80211_channel
*chan
,
1098 const struct ieee80211_reg_rule
*reg_rule
)
1105 * Note that right now we assume the desired channel bandwidth
1106 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
1107 * per channel, the primary and the extension channel).
1109 static void handle_channel(struct wiphy
*wiphy
,
1110 enum nl80211_reg_initiator initiator
,
1111 struct ieee80211_channel
*chan
)
1113 u32 flags
, bw_flags
= 0;
1114 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
1115 const struct ieee80211_power_rule
*power_rule
= NULL
;
1116 const struct ieee80211_freq_range
*freq_range
= NULL
;
1117 struct wiphy
*request_wiphy
= NULL
;
1118 struct regulatory_request
*lr
= get_last_request();
1119 const struct ieee80211_regdomain
*regd
;
1120 u32 max_bandwidth_khz
;
1122 request_wiphy
= wiphy_idx_to_wiphy(lr
->wiphy_idx
);
1124 flags
= chan
->orig_flags
;
1126 reg_rule
= freq_reg_info(wiphy
, MHZ_TO_KHZ(chan
->center_freq
));
1127 if (IS_ERR(reg_rule
)) {
1129 * We will disable all channels that do not match our
1130 * received regulatory rule unless the hint is coming
1131 * from a Country IE and the Country IE had no information
1132 * about a band. The IEEE 802.11 spec allows for an AP
1133 * to send only a subset of the regulatory rules allowed,
1134 * so an AP in the US that only supports 2.4 GHz may only send
1135 * a country IE with information for the 2.4 GHz band
1136 * while 5 GHz is still supported.
1138 if (initiator
== NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
1139 PTR_ERR(reg_rule
) == -ERANGE
)
1142 if (lr
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
&&
1143 request_wiphy
&& request_wiphy
== wiphy
&&
1144 request_wiphy
->regulatory_flags
& REGULATORY_STRICT_REG
) {
1145 REG_DBG_PRINT("Disabling freq %d MHz for good\n",
1147 chan
->orig_flags
|= IEEE80211_CHAN_DISABLED
;
1148 chan
->flags
= chan
->orig_flags
;
1150 REG_DBG_PRINT("Disabling freq %d MHz\n",
1152 chan
->flags
|= IEEE80211_CHAN_DISABLED
;
1157 regd
= reg_get_regdomain(wiphy
);
1158 chan_reg_rule_print_dbg(regd
, chan
, reg_rule
);
1160 power_rule
= ®_rule
->power_rule
;
1161 freq_range
= ®_rule
->freq_range
;
1163 max_bandwidth_khz
= freq_range
->max_bandwidth_khz
;
1164 /* Check if auto calculation requested */
1165 if (reg_rule
->flags
& NL80211_RRF_AUTO_BW
)
1166 max_bandwidth_khz
= reg_get_max_bandwidth(regd
, reg_rule
);
1168 if (max_bandwidth_khz
< MHZ_TO_KHZ(40))
1169 bw_flags
= IEEE80211_CHAN_NO_HT40
;
1170 if (max_bandwidth_khz
< MHZ_TO_KHZ(80))
1171 bw_flags
|= IEEE80211_CHAN_NO_80MHZ
;
1172 if (max_bandwidth_khz
< MHZ_TO_KHZ(160))
1173 bw_flags
|= IEEE80211_CHAN_NO_160MHZ
;
1175 if (lr
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
&&
1176 request_wiphy
&& request_wiphy
== wiphy
&&
1177 request_wiphy
->regulatory_flags
& REGULATORY_STRICT_REG
) {
1179 * This guarantees the driver's requested regulatory domain
1180 * will always be used as a base for further regulatory
1183 chan
->flags
= chan
->orig_flags
=
1184 map_regdom_flags(reg_rule
->flags
) | bw_flags
;
1185 chan
->max_antenna_gain
= chan
->orig_mag
=
1186 (int) MBI_TO_DBI(power_rule
->max_antenna_gain
);
1187 chan
->max_reg_power
= chan
->max_power
= chan
->orig_mpwr
=
1188 (int) MBM_TO_DBM(power_rule
->max_eirp
);
1190 if (chan
->flags
& IEEE80211_CHAN_RADAR
) {
1191 chan
->dfs_cac_ms
= IEEE80211_DFS_MIN_CAC_TIME_MS
;
1192 if (reg_rule
->dfs_cac_ms
)
1193 chan
->dfs_cac_ms
= reg_rule
->dfs_cac_ms
;
1199 chan
->dfs_state
= NL80211_DFS_USABLE
;
1200 chan
->dfs_state_entered
= jiffies
;
1202 chan
->beacon_found
= false;
1203 chan
->flags
= flags
| bw_flags
| map_regdom_flags(reg_rule
->flags
);
1204 chan
->max_antenna_gain
=
1205 min_t(int, chan
->orig_mag
,
1206 MBI_TO_DBI(power_rule
->max_antenna_gain
));
1207 chan
->max_reg_power
= (int) MBM_TO_DBM(power_rule
->max_eirp
);
1209 if (chan
->flags
& IEEE80211_CHAN_RADAR
) {
1210 if (reg_rule
->dfs_cac_ms
)
1211 chan
->dfs_cac_ms
= reg_rule
->dfs_cac_ms
;
1213 chan
->dfs_cac_ms
= IEEE80211_DFS_MIN_CAC_TIME_MS
;
1216 if (chan
->orig_mpwr
) {
1218 * Devices that use REGULATORY_COUNTRY_IE_FOLLOW_POWER
1219 * will always follow the passed country IE power settings.
1221 if (initiator
== NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
1222 wiphy
->regulatory_flags
& REGULATORY_COUNTRY_IE_FOLLOW_POWER
)
1223 chan
->max_power
= chan
->max_reg_power
;
1225 chan
->max_power
= min(chan
->orig_mpwr
,
1226 chan
->max_reg_power
);
1228 chan
->max_power
= chan
->max_reg_power
;
1231 static void handle_band(struct wiphy
*wiphy
,
1232 enum nl80211_reg_initiator initiator
,
1233 struct ieee80211_supported_band
*sband
)
1240 for (i
= 0; i
< sband
->n_channels
; i
++)
1241 handle_channel(wiphy
, initiator
, &sband
->channels
[i
]);
1244 static bool reg_request_cell_base(struct regulatory_request
*request
)
1246 if (request
->initiator
!= NL80211_REGDOM_SET_BY_USER
)
1248 return request
->user_reg_hint_type
== NL80211_USER_REG_HINT_CELL_BASE
;
1251 static bool reg_request_indoor(struct regulatory_request
*request
)
1253 if (request
->initiator
!= NL80211_REGDOM_SET_BY_USER
)
1255 return request
->user_reg_hint_type
== NL80211_USER_REG_HINT_INDOOR
;
1258 bool reg_last_request_cell_base(void)
1260 return reg_request_cell_base(get_last_request());
1263 #ifdef CONFIG_CFG80211_REG_CELLULAR_HINTS
1264 /* Core specific check */
1265 static enum reg_request_treatment
1266 reg_ignore_cell_hint(struct regulatory_request
*pending_request
)
1268 struct regulatory_request
*lr
= get_last_request();
1270 if (!reg_num_devs_support_basehint
)
1271 return REG_REQ_IGNORE
;
1273 if (reg_request_cell_base(lr
) &&
1274 !regdom_changes(pending_request
->alpha2
))
1275 return REG_REQ_ALREADY_SET
;
1280 /* Device specific check */
1281 static bool reg_dev_ignore_cell_hint(struct wiphy
*wiphy
)
1283 return !(wiphy
->features
& NL80211_FEATURE_CELL_BASE_REG_HINTS
);
1286 static int reg_ignore_cell_hint(struct regulatory_request
*pending_request
)
1288 return REG_REQ_IGNORE
;
1291 static bool reg_dev_ignore_cell_hint(struct wiphy
*wiphy
)
1297 static bool wiphy_strict_alpha2_regd(struct wiphy
*wiphy
)
1299 if (wiphy
->regulatory_flags
& REGULATORY_STRICT_REG
&&
1300 !(wiphy
->regulatory_flags
& REGULATORY_CUSTOM_REG
))
1305 static bool ignore_reg_update(struct wiphy
*wiphy
,
1306 enum nl80211_reg_initiator initiator
)
1308 struct regulatory_request
*lr
= get_last_request();
1311 REG_DBG_PRINT("Ignoring regulatory request set by %s "
1312 "since last_request is not set\n",
1313 reg_initiator_name(initiator
));
1317 if (initiator
== NL80211_REGDOM_SET_BY_CORE
&&
1318 wiphy
->regulatory_flags
& REGULATORY_CUSTOM_REG
) {
1319 REG_DBG_PRINT("Ignoring regulatory request set by %s "
1320 "since the driver uses its own custom "
1321 "regulatory domain\n",
1322 reg_initiator_name(initiator
));
1327 * wiphy->regd will be set once the device has its own
1328 * desired regulatory domain set
1330 if (wiphy_strict_alpha2_regd(wiphy
) && !wiphy
->regd
&&
1331 initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
1332 !is_world_regdom(lr
->alpha2
)) {
1333 REG_DBG_PRINT("Ignoring regulatory request set by %s "
1334 "since the driver requires its own regulatory "
1335 "domain to be set first\n",
1336 reg_initiator_name(initiator
));
1340 if (reg_request_cell_base(lr
))
1341 return reg_dev_ignore_cell_hint(wiphy
);
1346 static bool reg_is_world_roaming(struct wiphy
*wiphy
)
1348 const struct ieee80211_regdomain
*cr
= get_cfg80211_regdom();
1349 const struct ieee80211_regdomain
*wr
= get_wiphy_regdom(wiphy
);
1350 struct regulatory_request
*lr
= get_last_request();
1352 if (is_world_regdom(cr
->alpha2
) || (wr
&& is_world_regdom(wr
->alpha2
)))
1355 if (lr
&& lr
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
1356 wiphy
->regulatory_flags
& REGULATORY_CUSTOM_REG
)
1362 static void handle_reg_beacon(struct wiphy
*wiphy
, unsigned int chan_idx
,
1363 struct reg_beacon
*reg_beacon
)
1365 struct ieee80211_supported_band
*sband
;
1366 struct ieee80211_channel
*chan
;
1367 bool channel_changed
= false;
1368 struct ieee80211_channel chan_before
;
1370 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
1371 chan
= &sband
->channels
[chan_idx
];
1373 if (likely(chan
->center_freq
!= reg_beacon
->chan
.center_freq
))
1376 if (chan
->beacon_found
)
1379 chan
->beacon_found
= true;
1381 if (!reg_is_world_roaming(wiphy
))
1384 if (wiphy
->regulatory_flags
& REGULATORY_DISABLE_BEACON_HINTS
)
1387 chan_before
.center_freq
= chan
->center_freq
;
1388 chan_before
.flags
= chan
->flags
;
1390 if (chan
->flags
& IEEE80211_CHAN_NO_IR
) {
1391 chan
->flags
&= ~IEEE80211_CHAN_NO_IR
;
1392 channel_changed
= true;
1395 if (channel_changed
)
1396 nl80211_send_beacon_hint_event(wiphy
, &chan_before
, chan
);
1400 * Called when a scan on a wiphy finds a beacon on
1403 static void wiphy_update_new_beacon(struct wiphy
*wiphy
,
1404 struct reg_beacon
*reg_beacon
)
1407 struct ieee80211_supported_band
*sband
;
1409 if (!wiphy
->bands
[reg_beacon
->chan
.band
])
1412 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
1414 for (i
= 0; i
< sband
->n_channels
; i
++)
1415 handle_reg_beacon(wiphy
, i
, reg_beacon
);
1419 * Called upon reg changes or a new wiphy is added
1421 static void wiphy_update_beacon_reg(struct wiphy
*wiphy
)
1424 struct ieee80211_supported_band
*sband
;
1425 struct reg_beacon
*reg_beacon
;
1427 list_for_each_entry(reg_beacon
, ®_beacon_list
, list
) {
1428 if (!wiphy
->bands
[reg_beacon
->chan
.band
])
1430 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
1431 for (i
= 0; i
< sband
->n_channels
; i
++)
1432 handle_reg_beacon(wiphy
, i
, reg_beacon
);
1436 /* Reap the advantages of previously found beacons */
1437 static void reg_process_beacons(struct wiphy
*wiphy
)
1440 * Means we are just firing up cfg80211, so no beacons would
1441 * have been processed yet.
1445 wiphy_update_beacon_reg(wiphy
);
1448 static bool is_ht40_allowed(struct ieee80211_channel
*chan
)
1452 if (chan
->flags
& IEEE80211_CHAN_DISABLED
)
1454 /* This would happen when regulatory rules disallow HT40 completely */
1455 if ((chan
->flags
& IEEE80211_CHAN_NO_HT40
) == IEEE80211_CHAN_NO_HT40
)
1460 static void reg_process_ht_flags_channel(struct wiphy
*wiphy
,
1461 struct ieee80211_channel
*channel
)
1463 struct ieee80211_supported_band
*sband
= wiphy
->bands
[channel
->band
];
1464 struct ieee80211_channel
*channel_before
= NULL
, *channel_after
= NULL
;
1467 if (!is_ht40_allowed(channel
)) {
1468 channel
->flags
|= IEEE80211_CHAN_NO_HT40
;
1473 * We need to ensure the extension channels exist to
1474 * be able to use HT40- or HT40+, this finds them (or not)
1476 for (i
= 0; i
< sband
->n_channels
; i
++) {
1477 struct ieee80211_channel
*c
= &sband
->channels
[i
];
1479 if (c
->center_freq
== (channel
->center_freq
- 20))
1481 if (c
->center_freq
== (channel
->center_freq
+ 20))
1486 * Please note that this assumes target bandwidth is 20 MHz,
1487 * if that ever changes we also need to change the below logic
1488 * to include that as well.
1490 if (!is_ht40_allowed(channel_before
))
1491 channel
->flags
|= IEEE80211_CHAN_NO_HT40MINUS
;
1493 channel
->flags
&= ~IEEE80211_CHAN_NO_HT40MINUS
;
1495 if (!is_ht40_allowed(channel_after
))
1496 channel
->flags
|= IEEE80211_CHAN_NO_HT40PLUS
;
1498 channel
->flags
&= ~IEEE80211_CHAN_NO_HT40PLUS
;
1501 static void reg_process_ht_flags_band(struct wiphy
*wiphy
,
1502 struct ieee80211_supported_band
*sband
)
1509 for (i
= 0; i
< sband
->n_channels
; i
++)
1510 reg_process_ht_flags_channel(wiphy
, &sband
->channels
[i
]);
1513 static void reg_process_ht_flags(struct wiphy
*wiphy
)
1515 enum ieee80211_band band
;
1520 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++)
1521 reg_process_ht_flags_band(wiphy
, wiphy
->bands
[band
]);
1524 static void reg_call_notifier(struct wiphy
*wiphy
,
1525 struct regulatory_request
*request
)
1527 if (wiphy
->reg_notifier
)
1528 wiphy
->reg_notifier(wiphy
, request
);
1531 static bool reg_wdev_chan_valid(struct wiphy
*wiphy
, struct wireless_dev
*wdev
)
1533 struct ieee80211_channel
*ch
;
1534 struct cfg80211_chan_def chandef
;
1535 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wiphy
);
1540 if (!wdev
->netdev
|| !netif_running(wdev
->netdev
))
1543 switch (wdev
->iftype
) {
1544 case NL80211_IFTYPE_AP
:
1545 case NL80211_IFTYPE_P2P_GO
:
1546 if (!wdev
->beacon_interval
)
1549 ret
= cfg80211_reg_can_beacon(wiphy
,
1550 &wdev
->chandef
, wdev
->iftype
);
1552 case NL80211_IFTYPE_ADHOC
:
1553 if (!wdev
->ssid_len
)
1556 ret
= cfg80211_reg_can_beacon(wiphy
,
1557 &wdev
->chandef
, wdev
->iftype
);
1559 case NL80211_IFTYPE_STATION
:
1560 case NL80211_IFTYPE_P2P_CLIENT
:
1561 if (!wdev
->current_bss
||
1562 !wdev
->current_bss
->pub
.channel
)
1565 ch
= wdev
->current_bss
->pub
.channel
;
1566 if (rdev
->ops
->get_channel
&&
1567 !rdev_get_channel(rdev
, wdev
, &chandef
))
1568 ret
= cfg80211_chandef_usable(wiphy
, &chandef
,
1569 IEEE80211_CHAN_DISABLED
);
1571 ret
= !(ch
->flags
& IEEE80211_CHAN_DISABLED
);
1573 case NL80211_IFTYPE_MONITOR
:
1574 case NL80211_IFTYPE_AP_VLAN
:
1575 case NL80211_IFTYPE_P2P_DEVICE
:
1576 /* no enforcement required */
1579 /* others not implemented for now */
1589 static void reg_leave_invalid_chans(struct wiphy
*wiphy
)
1591 struct wireless_dev
*wdev
;
1592 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wiphy
);
1596 list_for_each_entry(wdev
, &rdev
->wdev_list
, list
)
1597 if (!reg_wdev_chan_valid(wiphy
, wdev
))
1598 cfg80211_leave(rdev
, wdev
);
1601 static void reg_check_chans_work(struct work_struct
*work
)
1603 struct cfg80211_registered_device
*rdev
;
1605 REG_DBG_PRINT("Verifying active interfaces after reg change\n");
1608 list_for_each_entry(rdev
, &cfg80211_rdev_list
, list
)
1609 if (!(rdev
->wiphy
.regulatory_flags
&
1610 REGULATORY_IGNORE_STALE_KICKOFF
))
1611 reg_leave_invalid_chans(&rdev
->wiphy
);
1616 static void reg_check_channels(void)
1619 * Give usermode a chance to do something nicer (move to another
1620 * channel, orderly disconnection), before forcing a disconnection.
1622 mod_delayed_work(system_power_efficient_wq
,
1624 msecs_to_jiffies(REG_ENFORCE_GRACE_MS
));
1627 static void wiphy_update_regulatory(struct wiphy
*wiphy
,
1628 enum nl80211_reg_initiator initiator
)
1630 enum ieee80211_band band
;
1631 struct regulatory_request
*lr
= get_last_request();
1633 if (ignore_reg_update(wiphy
, initiator
)) {
1635 * Regulatory updates set by CORE are ignored for custom
1636 * regulatory cards. Let us notify the changes to the driver,
1637 * as some drivers used this to restore its orig_* reg domain.
1639 if (initiator
== NL80211_REGDOM_SET_BY_CORE
&&
1640 wiphy
->regulatory_flags
& REGULATORY_CUSTOM_REG
)
1641 reg_call_notifier(wiphy
, lr
);
1645 lr
->dfs_region
= get_cfg80211_regdom()->dfs_region
;
1647 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++)
1648 handle_band(wiphy
, initiator
, wiphy
->bands
[band
]);
1650 reg_process_beacons(wiphy
);
1651 reg_process_ht_flags(wiphy
);
1652 reg_call_notifier(wiphy
, lr
);
1655 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator
)
1657 struct cfg80211_registered_device
*rdev
;
1658 struct wiphy
*wiphy
;
1662 list_for_each_entry(rdev
, &cfg80211_rdev_list
, list
) {
1663 wiphy
= &rdev
->wiphy
;
1664 wiphy_update_regulatory(wiphy
, initiator
);
1667 reg_check_channels();
1670 static void handle_channel_custom(struct wiphy
*wiphy
,
1671 struct ieee80211_channel
*chan
,
1672 const struct ieee80211_regdomain
*regd
)
1675 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
1676 const struct ieee80211_power_rule
*power_rule
= NULL
;
1677 const struct ieee80211_freq_range
*freq_range
= NULL
;
1678 u32 max_bandwidth_khz
;
1680 reg_rule
= freq_reg_info_regd(wiphy
, MHZ_TO_KHZ(chan
->center_freq
),
1683 if (IS_ERR(reg_rule
)) {
1684 REG_DBG_PRINT("Disabling freq %d MHz as custom regd has no rule that fits it\n",
1686 chan
->orig_flags
|= IEEE80211_CHAN_DISABLED
;
1687 chan
->flags
= chan
->orig_flags
;
1691 chan_reg_rule_print_dbg(regd
, chan
, reg_rule
);
1693 power_rule
= ®_rule
->power_rule
;
1694 freq_range
= ®_rule
->freq_range
;
1696 max_bandwidth_khz
= freq_range
->max_bandwidth_khz
;
1697 /* Check if auto calculation requested */
1698 if (reg_rule
->flags
& NL80211_RRF_AUTO_BW
)
1699 max_bandwidth_khz
= reg_get_max_bandwidth(regd
, reg_rule
);
1701 if (max_bandwidth_khz
< MHZ_TO_KHZ(40))
1702 bw_flags
= IEEE80211_CHAN_NO_HT40
;
1703 if (max_bandwidth_khz
< MHZ_TO_KHZ(80))
1704 bw_flags
|= IEEE80211_CHAN_NO_80MHZ
;
1705 if (max_bandwidth_khz
< MHZ_TO_KHZ(160))
1706 bw_flags
|= IEEE80211_CHAN_NO_160MHZ
;
1708 chan
->dfs_state_entered
= jiffies
;
1709 chan
->dfs_state
= NL80211_DFS_USABLE
;
1711 chan
->beacon_found
= false;
1712 chan
->flags
|= map_regdom_flags(reg_rule
->flags
) | bw_flags
;
1713 chan
->max_antenna_gain
= (int) MBI_TO_DBI(power_rule
->max_antenna_gain
);
1714 chan
->max_reg_power
= chan
->max_power
=
1715 (int) MBM_TO_DBM(power_rule
->max_eirp
);
1717 if (chan
->flags
& IEEE80211_CHAN_RADAR
) {
1718 if (reg_rule
->dfs_cac_ms
)
1719 chan
->dfs_cac_ms
= reg_rule
->dfs_cac_ms
;
1721 chan
->dfs_cac_ms
= IEEE80211_DFS_MIN_CAC_TIME_MS
;
1724 chan
->max_power
= chan
->max_reg_power
;
1727 static void handle_band_custom(struct wiphy
*wiphy
,
1728 struct ieee80211_supported_band
*sband
,
1729 const struct ieee80211_regdomain
*regd
)
1736 for (i
= 0; i
< sband
->n_channels
; i
++)
1737 handle_channel_custom(wiphy
, &sband
->channels
[i
], regd
);
1740 /* Used by drivers prior to wiphy registration */
1741 void wiphy_apply_custom_regulatory(struct wiphy
*wiphy
,
1742 const struct ieee80211_regdomain
*regd
)
1744 enum ieee80211_band band
;
1745 unsigned int bands_set
= 0;
1747 WARN(!(wiphy
->regulatory_flags
& REGULATORY_CUSTOM_REG
),
1748 "wiphy should have REGULATORY_CUSTOM_REG\n");
1749 wiphy
->regulatory_flags
|= REGULATORY_CUSTOM_REG
;
1751 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
1752 if (!wiphy
->bands
[band
])
1754 handle_band_custom(wiphy
, wiphy
->bands
[band
], regd
);
1759 * no point in calling this if it won't have any effect
1760 * on your device's supported bands.
1762 WARN_ON(!bands_set
);
1764 EXPORT_SYMBOL(wiphy_apply_custom_regulatory
);
1766 static void reg_set_request_processed(void)
1768 bool need_more_processing
= false;
1769 struct regulatory_request
*lr
= get_last_request();
1771 lr
->processed
= true;
1773 spin_lock(®_requests_lock
);
1774 if (!list_empty(®_requests_list
))
1775 need_more_processing
= true;
1776 spin_unlock(®_requests_lock
);
1778 if (lr
->initiator
== NL80211_REGDOM_SET_BY_USER
)
1779 cancel_delayed_work(®_timeout
);
1781 if (need_more_processing
)
1782 schedule_work(®_work
);
1786 * reg_process_hint_core - process core regulatory requests
1787 * @pending_request: a pending core regulatory request
1789 * The wireless subsystem can use this function to process
1790 * a regulatory request issued by the regulatory core.
1792 * Returns one of the different reg request treatment values.
1794 static enum reg_request_treatment
1795 reg_process_hint_core(struct regulatory_request
*core_request
)
1798 core_request
->intersect
= false;
1799 core_request
->processed
= false;
1801 reg_update_last_request(core_request
);
1803 return reg_call_crda(core_request
);
1806 static enum reg_request_treatment
1807 __reg_process_hint_user(struct regulatory_request
*user_request
)
1809 struct regulatory_request
*lr
= get_last_request();
1811 if (reg_request_indoor(user_request
)) {
1812 reg_is_indoor
= true;
1813 return REG_REQ_USER_HINT_HANDLED
;
1816 if (reg_request_cell_base(user_request
))
1817 return reg_ignore_cell_hint(user_request
);
1819 if (reg_request_cell_base(lr
))
1820 return REG_REQ_IGNORE
;
1822 if (lr
->initiator
== NL80211_REGDOM_SET_BY_COUNTRY_IE
)
1823 return REG_REQ_INTERSECT
;
1825 * If the user knows better the user should set the regdom
1826 * to their country before the IE is picked up
1828 if (lr
->initiator
== NL80211_REGDOM_SET_BY_USER
&&
1830 return REG_REQ_IGNORE
;
1832 * Process user requests only after previous user/driver/core
1833 * requests have been processed
1835 if ((lr
->initiator
== NL80211_REGDOM_SET_BY_CORE
||
1836 lr
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
||
1837 lr
->initiator
== NL80211_REGDOM_SET_BY_USER
) &&
1838 regdom_changes(lr
->alpha2
))
1839 return REG_REQ_IGNORE
;
1841 if (!regdom_changes(user_request
->alpha2
))
1842 return REG_REQ_ALREADY_SET
;
1848 * reg_process_hint_user - process user regulatory requests
1849 * @user_request: a pending user regulatory request
1851 * The wireless subsystem can use this function to process
1852 * a regulatory request initiated by userspace.
1854 * Returns one of the different reg request treatment values.
1856 static enum reg_request_treatment
1857 reg_process_hint_user(struct regulatory_request
*user_request
)
1859 enum reg_request_treatment treatment
;
1861 treatment
= __reg_process_hint_user(user_request
);
1862 if (treatment
== REG_REQ_IGNORE
||
1863 treatment
== REG_REQ_ALREADY_SET
||
1864 treatment
== REG_REQ_USER_HINT_HANDLED
) {
1865 reg_free_request(user_request
);
1869 user_request
->intersect
= treatment
== REG_REQ_INTERSECT
;
1870 user_request
->processed
= false;
1872 reg_update_last_request(user_request
);
1874 user_alpha2
[0] = user_request
->alpha2
[0];
1875 user_alpha2
[1] = user_request
->alpha2
[1];
1877 return reg_call_crda(user_request
);
1880 static enum reg_request_treatment
1881 __reg_process_hint_driver(struct regulatory_request
*driver_request
)
1883 struct regulatory_request
*lr
= get_last_request();
1885 if (lr
->initiator
== NL80211_REGDOM_SET_BY_CORE
) {
1886 if (regdom_changes(driver_request
->alpha2
))
1888 return REG_REQ_ALREADY_SET
;
1892 * This would happen if you unplug and plug your card
1893 * back in or if you add a new device for which the previously
1894 * loaded card also agrees on the regulatory domain.
1896 if (lr
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
&&
1897 !regdom_changes(driver_request
->alpha2
))
1898 return REG_REQ_ALREADY_SET
;
1900 return REG_REQ_INTERSECT
;
1904 * reg_process_hint_driver - process driver regulatory requests
1905 * @driver_request: a pending driver regulatory request
1907 * The wireless subsystem can use this function to process
1908 * a regulatory request issued by an 802.11 driver.
1910 * Returns one of the different reg request treatment values.
1912 static enum reg_request_treatment
1913 reg_process_hint_driver(struct wiphy
*wiphy
,
1914 struct regulatory_request
*driver_request
)
1916 const struct ieee80211_regdomain
*regd
, *tmp
;
1917 enum reg_request_treatment treatment
;
1919 treatment
= __reg_process_hint_driver(driver_request
);
1921 switch (treatment
) {
1924 case REG_REQ_IGNORE
:
1925 case REG_REQ_USER_HINT_HANDLED
:
1926 reg_free_request(driver_request
);
1928 case REG_REQ_INTERSECT
:
1930 case REG_REQ_ALREADY_SET
:
1931 regd
= reg_copy_regd(get_cfg80211_regdom());
1933 reg_free_request(driver_request
);
1934 return REG_REQ_IGNORE
;
1937 tmp
= get_wiphy_regdom(wiphy
);
1938 rcu_assign_pointer(wiphy
->regd
, regd
);
1939 rcu_free_regdom(tmp
);
1943 driver_request
->intersect
= treatment
== REG_REQ_INTERSECT
;
1944 driver_request
->processed
= false;
1946 reg_update_last_request(driver_request
);
1949 * Since CRDA will not be called in this case as we already
1950 * have applied the requested regulatory domain before we just
1951 * inform userspace we have processed the request
1953 if (treatment
== REG_REQ_ALREADY_SET
) {
1954 nl80211_send_reg_change_event(driver_request
);
1955 reg_set_request_processed();
1959 return reg_call_crda(driver_request
);
1962 static enum reg_request_treatment
1963 __reg_process_hint_country_ie(struct wiphy
*wiphy
,
1964 struct regulatory_request
*country_ie_request
)
1966 struct wiphy
*last_wiphy
= NULL
;
1967 struct regulatory_request
*lr
= get_last_request();
1969 if (reg_request_cell_base(lr
)) {
1970 /* Trust a Cell base station over the AP's country IE */
1971 if (regdom_changes(country_ie_request
->alpha2
))
1972 return REG_REQ_IGNORE
;
1973 return REG_REQ_ALREADY_SET
;
1975 if (wiphy
->regulatory_flags
& REGULATORY_COUNTRY_IE_IGNORE
)
1976 return REG_REQ_IGNORE
;
1979 if (unlikely(!is_an_alpha2(country_ie_request
->alpha2
)))
1982 if (lr
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
)
1985 last_wiphy
= wiphy_idx_to_wiphy(lr
->wiphy_idx
);
1987 if (last_wiphy
!= wiphy
) {
1989 * Two cards with two APs claiming different
1990 * Country IE alpha2s. We could
1991 * intersect them, but that seems unlikely
1992 * to be correct. Reject second one for now.
1994 if (regdom_changes(country_ie_request
->alpha2
))
1995 return REG_REQ_IGNORE
;
1996 return REG_REQ_ALREADY_SET
;
1999 if (regdom_changes(country_ie_request
->alpha2
))
2001 return REG_REQ_ALREADY_SET
;
2005 * reg_process_hint_country_ie - process regulatory requests from country IEs
2006 * @country_ie_request: a regulatory request from a country IE
2008 * The wireless subsystem can use this function to process
2009 * a regulatory request issued by a country Information Element.
2011 * Returns one of the different reg request treatment values.
2013 static enum reg_request_treatment
2014 reg_process_hint_country_ie(struct wiphy
*wiphy
,
2015 struct regulatory_request
*country_ie_request
)
2017 enum reg_request_treatment treatment
;
2019 treatment
= __reg_process_hint_country_ie(wiphy
, country_ie_request
);
2021 switch (treatment
) {
2024 case REG_REQ_IGNORE
:
2025 case REG_REQ_USER_HINT_HANDLED
:
2027 case REG_REQ_ALREADY_SET
:
2028 reg_free_request(country_ie_request
);
2030 case REG_REQ_INTERSECT
:
2031 reg_free_request(country_ie_request
);
2033 * This doesn't happen yet, not sure we
2034 * ever want to support it for this case.
2036 WARN_ONCE(1, "Unexpected intersection for country IEs");
2037 return REG_REQ_IGNORE
;
2040 country_ie_request
->intersect
= false;
2041 country_ie_request
->processed
= false;
2043 reg_update_last_request(country_ie_request
);
2045 return reg_call_crda(country_ie_request
);
2048 /* This processes *all* regulatory hints */
2049 static void reg_process_hint(struct regulatory_request
*reg_request
)
2051 struct wiphy
*wiphy
= NULL
;
2052 enum reg_request_treatment treatment
;
2054 if (reg_request
->wiphy_idx
!= WIPHY_IDX_INVALID
)
2055 wiphy
= wiphy_idx_to_wiphy(reg_request
->wiphy_idx
);
2057 switch (reg_request
->initiator
) {
2058 case NL80211_REGDOM_SET_BY_CORE
:
2059 reg_process_hint_core(reg_request
);
2061 case NL80211_REGDOM_SET_BY_USER
:
2062 treatment
= reg_process_hint_user(reg_request
);
2063 if (treatment
== REG_REQ_IGNORE
||
2064 treatment
== REG_REQ_ALREADY_SET
||
2065 treatment
== REG_REQ_USER_HINT_HANDLED
)
2067 queue_delayed_work(system_power_efficient_wq
,
2068 ®_timeout
, msecs_to_jiffies(3142));
2070 case NL80211_REGDOM_SET_BY_DRIVER
:
2073 treatment
= reg_process_hint_driver(wiphy
, reg_request
);
2075 case NL80211_REGDOM_SET_BY_COUNTRY_IE
:
2078 treatment
= reg_process_hint_country_ie(wiphy
, reg_request
);
2081 WARN(1, "invalid initiator %d\n", reg_request
->initiator
);
2085 /* This is required so that the orig_* parameters are saved */
2086 if (treatment
== REG_REQ_ALREADY_SET
&& wiphy
&&
2087 wiphy
->regulatory_flags
& REGULATORY_STRICT_REG
) {
2088 wiphy_update_regulatory(wiphy
, reg_request
->initiator
);
2089 reg_check_channels();
2095 reg_free_request(reg_request
);
2099 * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
2100 * Regulatory hints come on a first come first serve basis and we
2101 * must process each one atomically.
2103 static void reg_process_pending_hints(void)
2105 struct regulatory_request
*reg_request
, *lr
;
2107 lr
= get_last_request();
2109 /* When last_request->processed becomes true this will be rescheduled */
2110 if (lr
&& !lr
->processed
) {
2111 reg_process_hint(lr
);
2115 spin_lock(®_requests_lock
);
2117 if (list_empty(®_requests_list
)) {
2118 spin_unlock(®_requests_lock
);
2122 reg_request
= list_first_entry(®_requests_list
,
2123 struct regulatory_request
,
2125 list_del_init(®_request
->list
);
2127 spin_unlock(®_requests_lock
);
2129 reg_process_hint(reg_request
);
2132 /* Processes beacon hints -- this has nothing to do with country IEs */
2133 static void reg_process_pending_beacon_hints(void)
2135 struct cfg80211_registered_device
*rdev
;
2136 struct reg_beacon
*pending_beacon
, *tmp
;
2138 /* This goes through the _pending_ beacon list */
2139 spin_lock_bh(®_pending_beacons_lock
);
2141 list_for_each_entry_safe(pending_beacon
, tmp
,
2142 ®_pending_beacons
, list
) {
2143 list_del_init(&pending_beacon
->list
);
2145 /* Applies the beacon hint to current wiphys */
2146 list_for_each_entry(rdev
, &cfg80211_rdev_list
, list
)
2147 wiphy_update_new_beacon(&rdev
->wiphy
, pending_beacon
);
2149 /* Remembers the beacon hint for new wiphys or reg changes */
2150 list_add_tail(&pending_beacon
->list
, ®_beacon_list
);
2153 spin_unlock_bh(®_pending_beacons_lock
);
2156 static void reg_todo(struct work_struct
*work
)
2159 reg_process_pending_hints();
2160 reg_process_pending_beacon_hints();
2164 static void queue_regulatory_request(struct regulatory_request
*request
)
2166 request
->alpha2
[0] = toupper(request
->alpha2
[0]);
2167 request
->alpha2
[1] = toupper(request
->alpha2
[1]);
2169 spin_lock(®_requests_lock
);
2170 list_add_tail(&request
->list
, ®_requests_list
);
2171 spin_unlock(®_requests_lock
);
2173 schedule_work(®_work
);
2177 * Core regulatory hint -- happens during cfg80211_init()
2178 * and when we restore regulatory settings.
2180 static int regulatory_hint_core(const char *alpha2
)
2182 struct regulatory_request
*request
;
2184 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
2188 request
->alpha2
[0] = alpha2
[0];
2189 request
->alpha2
[1] = alpha2
[1];
2190 request
->initiator
= NL80211_REGDOM_SET_BY_CORE
;
2192 queue_regulatory_request(request
);
2198 int regulatory_hint_user(const char *alpha2
,
2199 enum nl80211_user_reg_hint_type user_reg_hint_type
)
2201 struct regulatory_request
*request
;
2203 if (WARN_ON(!alpha2
))
2206 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
2210 request
->wiphy_idx
= WIPHY_IDX_INVALID
;
2211 request
->alpha2
[0] = alpha2
[0];
2212 request
->alpha2
[1] = alpha2
[1];
2213 request
->initiator
= NL80211_REGDOM_SET_BY_USER
;
2214 request
->user_reg_hint_type
= user_reg_hint_type
;
2216 queue_regulatory_request(request
);
2221 int regulatory_hint_indoor_user(void)
2223 struct regulatory_request
*request
;
2225 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
2229 request
->wiphy_idx
= WIPHY_IDX_INVALID
;
2230 request
->initiator
= NL80211_REGDOM_SET_BY_USER
;
2231 request
->user_reg_hint_type
= NL80211_USER_REG_HINT_INDOOR
;
2232 queue_regulatory_request(request
);
2238 int regulatory_hint(struct wiphy
*wiphy
, const char *alpha2
)
2240 struct regulatory_request
*request
;
2242 if (WARN_ON(!alpha2
|| !wiphy
))
2245 wiphy
->regulatory_flags
&= ~REGULATORY_CUSTOM_REG
;
2247 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
2251 request
->wiphy_idx
= get_wiphy_idx(wiphy
);
2253 request
->alpha2
[0] = alpha2
[0];
2254 request
->alpha2
[1] = alpha2
[1];
2255 request
->initiator
= NL80211_REGDOM_SET_BY_DRIVER
;
2257 queue_regulatory_request(request
);
2261 EXPORT_SYMBOL(regulatory_hint
);
2263 void regulatory_hint_country_ie(struct wiphy
*wiphy
, enum ieee80211_band band
,
2264 const u8
*country_ie
, u8 country_ie_len
)
2267 enum environment_cap env
= ENVIRON_ANY
;
2268 struct regulatory_request
*request
= NULL
, *lr
;
2270 /* IE len must be evenly divisible by 2 */
2271 if (country_ie_len
& 0x01)
2274 if (country_ie_len
< IEEE80211_COUNTRY_IE_MIN_LEN
)
2277 request
= kzalloc(sizeof(*request
), GFP_KERNEL
);
2281 alpha2
[0] = country_ie
[0];
2282 alpha2
[1] = country_ie
[1];
2284 if (country_ie
[2] == 'I')
2285 env
= ENVIRON_INDOOR
;
2286 else if (country_ie
[2] == 'O')
2287 env
= ENVIRON_OUTDOOR
;
2290 lr
= get_last_request();
2296 * We will run this only upon a successful connection on cfg80211.
2297 * We leave conflict resolution to the workqueue, where can hold
2300 if (lr
->initiator
== NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
2301 lr
->wiphy_idx
!= WIPHY_IDX_INVALID
)
2304 request
->wiphy_idx
= get_wiphy_idx(wiphy
);
2305 request
->alpha2
[0] = alpha2
[0];
2306 request
->alpha2
[1] = alpha2
[1];
2307 request
->initiator
= NL80211_REGDOM_SET_BY_COUNTRY_IE
;
2308 request
->country_ie_env
= env
;
2310 queue_regulatory_request(request
);
2317 static void restore_alpha2(char *alpha2
, bool reset_user
)
2319 /* indicates there is no alpha2 to consider for restoration */
2323 /* The user setting has precedence over the module parameter */
2324 if (is_user_regdom_saved()) {
2325 /* Unless we're asked to ignore it and reset it */
2327 REG_DBG_PRINT("Restoring regulatory settings including user preference\n");
2328 user_alpha2
[0] = '9';
2329 user_alpha2
[1] = '7';
2332 * If we're ignoring user settings, we still need to
2333 * check the module parameter to ensure we put things
2334 * back as they were for a full restore.
2336 if (!is_world_regdom(ieee80211_regdom
)) {
2337 REG_DBG_PRINT("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
2338 ieee80211_regdom
[0], ieee80211_regdom
[1]);
2339 alpha2
[0] = ieee80211_regdom
[0];
2340 alpha2
[1] = ieee80211_regdom
[1];
2343 REG_DBG_PRINT("Restoring regulatory settings while preserving user preference for: %c%c\n",
2344 user_alpha2
[0], user_alpha2
[1]);
2345 alpha2
[0] = user_alpha2
[0];
2346 alpha2
[1] = user_alpha2
[1];
2348 } else if (!is_world_regdom(ieee80211_regdom
)) {
2349 REG_DBG_PRINT("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
2350 ieee80211_regdom
[0], ieee80211_regdom
[1]);
2351 alpha2
[0] = ieee80211_regdom
[0];
2352 alpha2
[1] = ieee80211_regdom
[1];
2354 REG_DBG_PRINT("Restoring regulatory settings\n");
2357 static void restore_custom_reg_settings(struct wiphy
*wiphy
)
2359 struct ieee80211_supported_band
*sband
;
2360 enum ieee80211_band band
;
2361 struct ieee80211_channel
*chan
;
2364 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
2365 sband
= wiphy
->bands
[band
];
2368 for (i
= 0; i
< sband
->n_channels
; i
++) {
2369 chan
= &sband
->channels
[i
];
2370 chan
->flags
= chan
->orig_flags
;
2371 chan
->max_antenna_gain
= chan
->orig_mag
;
2372 chan
->max_power
= chan
->orig_mpwr
;
2373 chan
->beacon_found
= false;
2379 * Restoring regulatory settings involves ingoring any
2380 * possibly stale country IE information and user regulatory
2381 * settings if so desired, this includes any beacon hints
2382 * learned as we could have traveled outside to another country
2383 * after disconnection. To restore regulatory settings we do
2384 * exactly what we did at bootup:
2386 * - send a core regulatory hint
2387 * - send a user regulatory hint if applicable
2389 * Device drivers that send a regulatory hint for a specific country
2390 * keep their own regulatory domain on wiphy->regd so that does does
2391 * not need to be remembered.
2393 static void restore_regulatory_settings(bool reset_user
)
2396 char world_alpha2
[2];
2397 struct reg_beacon
*reg_beacon
, *btmp
;
2398 struct regulatory_request
*reg_request
, *tmp
;
2399 LIST_HEAD(tmp_reg_req_list
);
2400 struct cfg80211_registered_device
*rdev
;
2404 reg_is_indoor
= false;
2406 reset_regdomains(true, &world_regdom
);
2407 restore_alpha2(alpha2
, reset_user
);
2410 * If there's any pending requests we simply
2411 * stash them to a temporary pending queue and
2412 * add then after we've restored regulatory
2415 spin_lock(®_requests_lock
);
2416 list_for_each_entry_safe(reg_request
, tmp
, ®_requests_list
, list
) {
2417 if (reg_request
->initiator
!= NL80211_REGDOM_SET_BY_USER
)
2419 list_move_tail(®_request
->list
, &tmp_reg_req_list
);
2421 spin_unlock(®_requests_lock
);
2423 /* Clear beacon hints */
2424 spin_lock_bh(®_pending_beacons_lock
);
2425 list_for_each_entry_safe(reg_beacon
, btmp
, ®_pending_beacons
, list
) {
2426 list_del(®_beacon
->list
);
2429 spin_unlock_bh(®_pending_beacons_lock
);
2431 list_for_each_entry_safe(reg_beacon
, btmp
, ®_beacon_list
, list
) {
2432 list_del(®_beacon
->list
);
2436 /* First restore to the basic regulatory settings */
2437 world_alpha2
[0] = cfg80211_world_regdom
->alpha2
[0];
2438 world_alpha2
[1] = cfg80211_world_regdom
->alpha2
[1];
2440 list_for_each_entry(rdev
, &cfg80211_rdev_list
, list
) {
2441 if (rdev
->wiphy
.regulatory_flags
& REGULATORY_CUSTOM_REG
)
2442 restore_custom_reg_settings(&rdev
->wiphy
);
2445 regulatory_hint_core(world_alpha2
);
2448 * This restores the ieee80211_regdom module parameter
2449 * preference or the last user requested regulatory
2450 * settings, user regulatory settings takes precedence.
2452 if (is_an_alpha2(alpha2
))
2453 regulatory_hint_user(user_alpha2
, NL80211_USER_REG_HINT_USER
);
2455 spin_lock(®_requests_lock
);
2456 list_splice_tail_init(&tmp_reg_req_list
, ®_requests_list
);
2457 spin_unlock(®_requests_lock
);
2459 REG_DBG_PRINT("Kicking the queue\n");
2461 schedule_work(®_work
);
2464 void regulatory_hint_disconnect(void)
2466 REG_DBG_PRINT("All devices are disconnected, going to restore regulatory settings\n");
2467 restore_regulatory_settings(false);
2470 static bool freq_is_chan_12_13_14(u16 freq
)
2472 if (freq
== ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ
) ||
2473 freq
== ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ
) ||
2474 freq
== ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ
))
2479 static bool pending_reg_beacon(struct ieee80211_channel
*beacon_chan
)
2481 struct reg_beacon
*pending_beacon
;
2483 list_for_each_entry(pending_beacon
, ®_pending_beacons
, list
)
2484 if (beacon_chan
->center_freq
==
2485 pending_beacon
->chan
.center_freq
)
2490 int regulatory_hint_found_beacon(struct wiphy
*wiphy
,
2491 struct ieee80211_channel
*beacon_chan
,
2494 struct reg_beacon
*reg_beacon
;
2497 if (beacon_chan
->beacon_found
||
2498 beacon_chan
->flags
& IEEE80211_CHAN_RADAR
||
2499 (beacon_chan
->band
== IEEE80211_BAND_2GHZ
&&
2500 !freq_is_chan_12_13_14(beacon_chan
->center_freq
)))
2503 spin_lock_bh(®_pending_beacons_lock
);
2504 processing
= pending_reg_beacon(beacon_chan
);
2505 spin_unlock_bh(®_pending_beacons_lock
);
2510 reg_beacon
= kzalloc(sizeof(struct reg_beacon
), gfp
);
2514 REG_DBG_PRINT("Found new beacon on frequency: %d MHz (Ch %d) on %s\n",
2515 beacon_chan
->center_freq
,
2516 ieee80211_frequency_to_channel(beacon_chan
->center_freq
),
2519 memcpy(®_beacon
->chan
, beacon_chan
,
2520 sizeof(struct ieee80211_channel
));
2523 * Since we can be called from BH or and non-BH context
2524 * we must use spin_lock_bh()
2526 spin_lock_bh(®_pending_beacons_lock
);
2527 list_add_tail(®_beacon
->list
, ®_pending_beacons
);
2528 spin_unlock_bh(®_pending_beacons_lock
);
2530 schedule_work(®_work
);
2535 static void print_rd_rules(const struct ieee80211_regdomain
*rd
)
2538 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
2539 const struct ieee80211_freq_range
*freq_range
= NULL
;
2540 const struct ieee80211_power_rule
*power_rule
= NULL
;
2541 char bw
[32], cac_time
[32];
2543 pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)\n");
2545 for (i
= 0; i
< rd
->n_reg_rules
; i
++) {
2546 reg_rule
= &rd
->reg_rules
[i
];
2547 freq_range
= ®_rule
->freq_range
;
2548 power_rule
= ®_rule
->power_rule
;
2550 if (reg_rule
->flags
& NL80211_RRF_AUTO_BW
)
2551 snprintf(bw
, sizeof(bw
), "%d KHz, %d KHz AUTO",
2552 freq_range
->max_bandwidth_khz
,
2553 reg_get_max_bandwidth(rd
, reg_rule
));
2555 snprintf(bw
, sizeof(bw
), "%d KHz",
2556 freq_range
->max_bandwidth_khz
);
2558 if (reg_rule
->flags
& NL80211_RRF_DFS
)
2559 scnprintf(cac_time
, sizeof(cac_time
), "%u s",
2560 reg_rule
->dfs_cac_ms
/1000);
2562 scnprintf(cac_time
, sizeof(cac_time
), "N/A");
2566 * There may not be documentation for max antenna gain
2567 * in certain regions
2569 if (power_rule
->max_antenna_gain
)
2570 pr_info(" (%d KHz - %d KHz @ %s), (%d mBi, %d mBm), (%s)\n",
2571 freq_range
->start_freq_khz
,
2572 freq_range
->end_freq_khz
,
2574 power_rule
->max_antenna_gain
,
2575 power_rule
->max_eirp
,
2578 pr_info(" (%d KHz - %d KHz @ %s), (N/A, %d mBm), (%s)\n",
2579 freq_range
->start_freq_khz
,
2580 freq_range
->end_freq_khz
,
2582 power_rule
->max_eirp
,
2587 bool reg_supported_dfs_region(enum nl80211_dfs_regions dfs_region
)
2589 switch (dfs_region
) {
2590 case NL80211_DFS_UNSET
:
2591 case NL80211_DFS_FCC
:
2592 case NL80211_DFS_ETSI
:
2593 case NL80211_DFS_JP
:
2596 REG_DBG_PRINT("Ignoring uknown DFS master region: %d\n",
2602 static void print_regdomain(const struct ieee80211_regdomain
*rd
)
2604 struct regulatory_request
*lr
= get_last_request();
2606 if (is_intersected_alpha2(rd
->alpha2
)) {
2607 if (lr
->initiator
== NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
2608 struct cfg80211_registered_device
*rdev
;
2609 rdev
= cfg80211_rdev_by_wiphy_idx(lr
->wiphy_idx
);
2611 pr_info("Current regulatory domain updated by AP to: %c%c\n",
2612 rdev
->country_ie_alpha2
[0],
2613 rdev
->country_ie_alpha2
[1]);
2615 pr_info("Current regulatory domain intersected:\n");
2617 pr_info("Current regulatory domain intersected:\n");
2618 } else if (is_world_regdom(rd
->alpha2
)) {
2619 pr_info("World regulatory domain updated:\n");
2621 if (is_unknown_alpha2(rd
->alpha2
))
2622 pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n");
2624 if (reg_request_cell_base(lr
))
2625 pr_info("Regulatory domain changed to country: %c%c by Cell Station\n",
2626 rd
->alpha2
[0], rd
->alpha2
[1]);
2628 pr_info("Regulatory domain changed to country: %c%c\n",
2629 rd
->alpha2
[0], rd
->alpha2
[1]);
2633 pr_info(" DFS Master region: %s", reg_dfs_region_str(rd
->dfs_region
));
2637 static void print_regdomain_info(const struct ieee80211_regdomain
*rd
)
2639 pr_info("Regulatory domain: %c%c\n", rd
->alpha2
[0], rd
->alpha2
[1]);
2643 static int reg_set_rd_core(const struct ieee80211_regdomain
*rd
)
2645 if (!is_world_regdom(rd
->alpha2
))
2647 update_world_regdomain(rd
);
2651 static int reg_set_rd_user(const struct ieee80211_regdomain
*rd
,
2652 struct regulatory_request
*user_request
)
2654 const struct ieee80211_regdomain
*intersected_rd
= NULL
;
2656 if (!regdom_changes(rd
->alpha2
))
2659 if (!is_valid_rd(rd
)) {
2660 pr_err("Invalid regulatory domain detected:\n");
2661 print_regdomain_info(rd
);
2665 if (!user_request
->intersect
) {
2666 reset_regdomains(false, rd
);
2670 intersected_rd
= regdom_intersect(rd
, get_cfg80211_regdom());
2671 if (!intersected_rd
)
2676 reset_regdomains(false, intersected_rd
);
2681 static int reg_set_rd_driver(const struct ieee80211_regdomain
*rd
,
2682 struct regulatory_request
*driver_request
)
2684 const struct ieee80211_regdomain
*regd
;
2685 const struct ieee80211_regdomain
*intersected_rd
= NULL
;
2686 const struct ieee80211_regdomain
*tmp
;
2687 struct wiphy
*request_wiphy
;
2689 if (is_world_regdom(rd
->alpha2
))
2692 if (!regdom_changes(rd
->alpha2
))
2695 if (!is_valid_rd(rd
)) {
2696 pr_err("Invalid regulatory domain detected:\n");
2697 print_regdomain_info(rd
);
2701 request_wiphy
= wiphy_idx_to_wiphy(driver_request
->wiphy_idx
);
2702 if (!request_wiphy
) {
2703 queue_delayed_work(system_power_efficient_wq
,
2708 if (!driver_request
->intersect
) {
2709 if (request_wiphy
->regd
)
2712 regd
= reg_copy_regd(rd
);
2714 return PTR_ERR(regd
);
2716 rcu_assign_pointer(request_wiphy
->regd
, regd
);
2717 reset_regdomains(false, rd
);
2721 intersected_rd
= regdom_intersect(rd
, get_cfg80211_regdom());
2722 if (!intersected_rd
)
2726 * We can trash what CRDA provided now.
2727 * However if a driver requested this specific regulatory
2728 * domain we keep it for its private use
2730 tmp
= get_wiphy_regdom(request_wiphy
);
2731 rcu_assign_pointer(request_wiphy
->regd
, rd
);
2732 rcu_free_regdom(tmp
);
2736 reset_regdomains(false, intersected_rd
);
2741 static int reg_set_rd_country_ie(const struct ieee80211_regdomain
*rd
,
2742 struct regulatory_request
*country_ie_request
)
2744 struct wiphy
*request_wiphy
;
2746 if (!is_alpha2_set(rd
->alpha2
) && !is_an_alpha2(rd
->alpha2
) &&
2747 !is_unknown_alpha2(rd
->alpha2
))
2751 * Lets only bother proceeding on the same alpha2 if the current
2752 * rd is non static (it means CRDA was present and was used last)
2753 * and the pending request came in from a country IE
2756 if (!is_valid_rd(rd
)) {
2757 pr_err("Invalid regulatory domain detected:\n");
2758 print_regdomain_info(rd
);
2762 request_wiphy
= wiphy_idx_to_wiphy(country_ie_request
->wiphy_idx
);
2763 if (!request_wiphy
) {
2764 queue_delayed_work(system_power_efficient_wq
,
2769 if (country_ie_request
->intersect
)
2772 reset_regdomains(false, rd
);
2777 * Use this call to set the current regulatory domain. Conflicts with
2778 * multiple drivers can be ironed out later. Caller must've already
2779 * kmalloc'd the rd structure.
2781 int set_regdom(const struct ieee80211_regdomain
*rd
)
2783 struct regulatory_request
*lr
;
2784 bool user_reset
= false;
2787 if (!reg_is_valid_request(rd
->alpha2
)) {
2792 lr
= get_last_request();
2794 /* Note that this doesn't update the wiphys, this is done below */
2795 switch (lr
->initiator
) {
2796 case NL80211_REGDOM_SET_BY_CORE
:
2797 r
= reg_set_rd_core(rd
);
2799 case NL80211_REGDOM_SET_BY_USER
:
2800 r
= reg_set_rd_user(rd
, lr
);
2803 case NL80211_REGDOM_SET_BY_DRIVER
:
2804 r
= reg_set_rd_driver(rd
, lr
);
2806 case NL80211_REGDOM_SET_BY_COUNTRY_IE
:
2807 r
= reg_set_rd_country_ie(rd
, lr
);
2810 WARN(1, "invalid initiator %d\n", lr
->initiator
);
2817 reg_set_request_processed();
2820 /* Back to world regulatory in case of errors */
2821 restore_regulatory_settings(user_reset
);
2828 /* This would make this whole thing pointless */
2829 if (WARN_ON(!lr
->intersect
&& rd
!= get_cfg80211_regdom()))
2832 /* update all wiphys now with the new established regulatory domain */
2833 update_all_wiphy_regulatory(lr
->initiator
);
2835 print_regdomain(get_cfg80211_regdom());
2837 nl80211_send_reg_change_event(lr
);
2839 reg_set_request_processed();
2844 void wiphy_regulatory_register(struct wiphy
*wiphy
)
2846 struct regulatory_request
*lr
;
2848 if (!reg_dev_ignore_cell_hint(wiphy
))
2849 reg_num_devs_support_basehint
++;
2851 lr
= get_last_request();
2852 wiphy_update_regulatory(wiphy
, lr
->initiator
);
2855 void wiphy_regulatory_deregister(struct wiphy
*wiphy
)
2857 struct wiphy
*request_wiphy
= NULL
;
2858 struct regulatory_request
*lr
;
2860 lr
= get_last_request();
2862 if (!reg_dev_ignore_cell_hint(wiphy
))
2863 reg_num_devs_support_basehint
--;
2865 rcu_free_regdom(get_wiphy_regdom(wiphy
));
2866 RCU_INIT_POINTER(wiphy
->regd
, NULL
);
2869 request_wiphy
= wiphy_idx_to_wiphy(lr
->wiphy_idx
);
2871 if (!request_wiphy
|| request_wiphy
!= wiphy
)
2874 lr
->wiphy_idx
= WIPHY_IDX_INVALID
;
2875 lr
->country_ie_env
= ENVIRON_ANY
;
2878 static void reg_timeout_work(struct work_struct
*work
)
2880 REG_DBG_PRINT("Timeout while waiting for CRDA to reply, restoring regulatory settings\n");
2882 restore_regulatory_settings(true);
2887 * See http://www.fcc.gov/document/5-ghz-unlicensed-spectrum-unii, for
2888 * UNII band definitions
2890 int cfg80211_get_unii(int freq
)
2893 if (freq
>= 5150 && freq
<= 5250)
2897 if (freq
> 5250 && freq
<= 5350)
2901 if (freq
> 5350 && freq
<= 5470)
2905 if (freq
> 5470 && freq
<= 5725)
2909 if (freq
> 5725 && freq
<= 5825)
2915 bool regulatory_indoor_allowed(void)
2917 return reg_is_indoor
;
2920 int __init
regulatory_init(void)
2924 reg_pdev
= platform_device_register_simple("regulatory", 0, NULL
, 0);
2925 if (IS_ERR(reg_pdev
))
2926 return PTR_ERR(reg_pdev
);
2928 spin_lock_init(®_requests_lock
);
2929 spin_lock_init(®_pending_beacons_lock
);
2931 reg_regdb_size_check();
2933 rcu_assign_pointer(cfg80211_regdomain
, cfg80211_world_regdom
);
2935 user_alpha2
[0] = '9';
2936 user_alpha2
[1] = '7';
2938 /* We always try to get an update for the static regdomain */
2939 err
= regulatory_hint_core(cfg80211_world_regdom
->alpha2
);
2944 * N.B. kobject_uevent_env() can fail mainly for when we're out
2945 * memory which is handled and propagated appropriately above
2946 * but it can also fail during a netlink_broadcast() or during
2947 * early boot for call_usermodehelper(). For now treat these
2948 * errors as non-fatal.
2950 pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
2954 * Finally, if the user set the module parameter treat it
2957 if (!is_world_regdom(ieee80211_regdom
))
2958 regulatory_hint_user(ieee80211_regdom
,
2959 NL80211_USER_REG_HINT_USER
);
2964 void regulatory_exit(void)
2966 struct regulatory_request
*reg_request
, *tmp
;
2967 struct reg_beacon
*reg_beacon
, *btmp
;
2969 cancel_work_sync(®_work
);
2970 cancel_delayed_work_sync(®_timeout
);
2971 cancel_delayed_work_sync(®_check_chans
);
2973 /* Lock to suppress warnings */
2975 reset_regdomains(true, NULL
);
2978 dev_set_uevent_suppress(®_pdev
->dev
, true);
2980 platform_device_unregister(reg_pdev
);
2982 list_for_each_entry_safe(reg_beacon
, btmp
, ®_pending_beacons
, list
) {
2983 list_del(®_beacon
->list
);
2987 list_for_each_entry_safe(reg_beacon
, btmp
, ®_beacon_list
, list
) {
2988 list_del(®_beacon
->list
);
2992 list_for_each_entry_safe(reg_request
, tmp
, ®_requests_list
, list
) {
2993 list_del(®_request
->list
);