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>
62 #ifdef CONFIG_CFG80211_REG_DEBUG
63 #define REG_DBG_PRINT(format, args...) \
64 printk(KERN_DEBUG pr_fmt(format), ##args)
66 #define REG_DBG_PRINT(args...)
70 * enum reg_request_treatment - regulatory request treatment
72 * @REG_REQ_OK: continue processing the regulatory request
73 * @REG_REQ_IGNORE: ignore the regulatory request
74 * @REG_REQ_INTERSECT: the regulatory domain resulting from this request should
75 * be intersected with the current one.
76 * @REG_REQ_ALREADY_SET: the regulatory request will not change the current
77 * regulatory settings, and no further processing is required.
78 * @REG_REQ_USER_HINT_HANDLED: a non alpha2 user hint was handled and no
79 * further processing is required, i.e., not need to update last_request
80 * etc. This should be used for user hints that do not provide an alpha2
81 * but some other type of regulatory hint, i.e., indoor operation.
83 enum reg_request_treatment
{
88 REG_REQ_USER_HINT_HANDLED
,
91 static struct regulatory_request core_request_world
= {
92 .initiator
= NL80211_REGDOM_SET_BY_CORE
,
97 .country_ie_env
= ENVIRON_ANY
,
101 * Receipt of information from last regulatory request,
102 * protected by RTNL (and can be accessed with RCU protection)
104 static struct regulatory_request __rcu
*last_request
=
105 (void __rcu
*)&core_request_world
;
107 /* To trigger userspace events */
108 static struct platform_device
*reg_pdev
;
111 * Central wireless core regulatory domains, we only need two,
112 * the current one and a world regulatory domain in case we have no
113 * information to give us an alpha2.
114 * (protected by RTNL, can be read under RCU)
116 const struct ieee80211_regdomain __rcu
*cfg80211_regdomain
;
119 * Number of devices that registered to the core
120 * that support cellular base station regulatory hints
121 * (protected by RTNL)
123 static int reg_num_devs_support_basehint
;
126 * State variable indicating if the platform on which the devices
127 * are attached is operating in an indoor environment. The state variable
128 * is relevant for all registered devices.
129 * (protected by RTNL)
131 static bool reg_is_indoor
;
133 static const struct ieee80211_regdomain
*get_cfg80211_regdom(void)
135 return rtnl_dereference(cfg80211_regdomain
);
138 static const struct ieee80211_regdomain
*get_wiphy_regdom(struct wiphy
*wiphy
)
140 return rtnl_dereference(wiphy
->regd
);
143 static const char *reg_dfs_region_str(enum nl80211_dfs_regions dfs_region
)
145 switch (dfs_region
) {
146 case NL80211_DFS_UNSET
:
148 case NL80211_DFS_FCC
:
150 case NL80211_DFS_ETSI
:
158 enum nl80211_dfs_regions
reg_get_dfs_region(struct wiphy
*wiphy
)
160 const struct ieee80211_regdomain
*regd
= NULL
;
161 const struct ieee80211_regdomain
*wiphy_regd
= NULL
;
163 regd
= get_cfg80211_regdom();
167 wiphy_regd
= get_wiphy_regdom(wiphy
);
171 if (wiphy_regd
->dfs_region
== regd
->dfs_region
)
174 REG_DBG_PRINT("%s: device specific dfs_region "
175 "(%s) disagrees with cfg80211's "
176 "central dfs_region (%s)\n",
177 dev_name(&wiphy
->dev
),
178 reg_dfs_region_str(wiphy_regd
->dfs_region
),
179 reg_dfs_region_str(regd
->dfs_region
));
182 return regd
->dfs_region
;
185 static void rcu_free_regdom(const struct ieee80211_regdomain
*r
)
189 kfree_rcu((struct ieee80211_regdomain
*)r
, rcu_head
);
192 static struct regulatory_request
*get_last_request(void)
194 return rcu_dereference_rtnl(last_request
);
197 /* Used to queue up regulatory hints */
198 static LIST_HEAD(reg_requests_list
);
199 static spinlock_t reg_requests_lock
;
201 /* Used to queue up beacon hints for review */
202 static LIST_HEAD(reg_pending_beacons
);
203 static spinlock_t reg_pending_beacons_lock
;
205 /* Used to keep track of processed beacon hints */
206 static LIST_HEAD(reg_beacon_list
);
209 struct list_head list
;
210 struct ieee80211_channel chan
;
213 static void reg_todo(struct work_struct
*work
);
214 static DECLARE_WORK(reg_work
, reg_todo
);
216 static void reg_timeout_work(struct work_struct
*work
);
217 static DECLARE_DELAYED_WORK(reg_timeout
, reg_timeout_work
);
219 /* We keep a static world regulatory domain in case of the absence of CRDA */
220 static const struct ieee80211_regdomain world_regdom
= {
224 /* IEEE 802.11b/g, channels 1..11 */
225 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
226 /* IEEE 802.11b/g, channels 12..13. */
227 REG_RULE(2467-10, 2472+10, 40, 6, 20,
229 /* IEEE 802.11 channel 14 - Only JP enables
230 * this and for 802.11b only */
231 REG_RULE(2484-10, 2484+10, 20, 6, 20,
233 NL80211_RRF_NO_OFDM
),
234 /* IEEE 802.11a, channel 36..48 */
235 REG_RULE(5180-10, 5240+10, 160, 6, 20,
238 /* IEEE 802.11a, channel 52..64 - DFS required */
239 REG_RULE(5260-10, 5320+10, 160, 6, 20,
243 /* IEEE 802.11a, channel 100..144 - DFS required */
244 REG_RULE(5500-10, 5720+10, 160, 6, 20,
248 /* IEEE 802.11a, channel 149..165 */
249 REG_RULE(5745-10, 5825+10, 80, 6, 20,
252 /* IEEE 802.11ad (60gHz), channels 1..3 */
253 REG_RULE(56160+2160*1-1080, 56160+2160*3+1080, 2160, 0, 0, 0),
257 /* protected by RTNL */
258 static const struct ieee80211_regdomain
*cfg80211_world_regdom
=
261 static char *ieee80211_regdom
= "00";
262 static char user_alpha2
[2];
264 module_param(ieee80211_regdom
, charp
, 0444);
265 MODULE_PARM_DESC(ieee80211_regdom
, "IEEE 802.11 regulatory domain code");
267 static void reg_free_request(struct regulatory_request
*request
)
269 if (request
!= get_last_request())
273 static void reg_free_last_request(void)
275 struct regulatory_request
*lr
= get_last_request();
277 if (lr
!= &core_request_world
&& lr
)
278 kfree_rcu(lr
, rcu_head
);
281 static void reg_update_last_request(struct regulatory_request
*request
)
283 struct regulatory_request
*lr
;
285 lr
= get_last_request();
289 reg_free_last_request();
290 rcu_assign_pointer(last_request
, request
);
293 static void reset_regdomains(bool full_reset
,
294 const struct ieee80211_regdomain
*new_regdom
)
296 const struct ieee80211_regdomain
*r
;
300 r
= get_cfg80211_regdom();
302 /* avoid freeing static information or freeing something twice */
303 if (r
== cfg80211_world_regdom
)
305 if (cfg80211_world_regdom
== &world_regdom
)
306 cfg80211_world_regdom
= NULL
;
307 if (r
== &world_regdom
)
311 rcu_free_regdom(cfg80211_world_regdom
);
313 cfg80211_world_regdom
= &world_regdom
;
314 rcu_assign_pointer(cfg80211_regdomain
, new_regdom
);
319 reg_update_last_request(&core_request_world
);
323 * Dynamic world regulatory domain requested by the wireless
324 * core upon initialization
326 static void update_world_regdomain(const struct ieee80211_regdomain
*rd
)
328 struct regulatory_request
*lr
;
330 lr
= get_last_request();
334 reset_regdomains(false, rd
);
336 cfg80211_world_regdom
= rd
;
339 bool is_world_regdom(const char *alpha2
)
343 return alpha2
[0] == '0' && alpha2
[1] == '0';
346 static bool is_alpha2_set(const char *alpha2
)
350 return alpha2
[0] && alpha2
[1];
353 static bool is_unknown_alpha2(const char *alpha2
)
358 * Special case where regulatory domain was built by driver
359 * but a specific alpha2 cannot be determined
361 return alpha2
[0] == '9' && alpha2
[1] == '9';
364 static bool is_intersected_alpha2(const char *alpha2
)
369 * Special case where regulatory domain is the
370 * result of an intersection between two regulatory domain
373 return alpha2
[0] == '9' && alpha2
[1] == '8';
376 static bool is_an_alpha2(const char *alpha2
)
380 return isalpha(alpha2
[0]) && isalpha(alpha2
[1]);
383 static bool alpha2_equal(const char *alpha2_x
, const char *alpha2_y
)
385 if (!alpha2_x
|| !alpha2_y
)
387 return alpha2_x
[0] == alpha2_y
[0] && alpha2_x
[1] == alpha2_y
[1];
390 static bool regdom_changes(const char *alpha2
)
392 const struct ieee80211_regdomain
*r
= get_cfg80211_regdom();
396 return !alpha2_equal(r
->alpha2
, alpha2
);
400 * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
401 * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
402 * has ever been issued.
404 static bool is_user_regdom_saved(void)
406 if (user_alpha2
[0] == '9' && user_alpha2
[1] == '7')
409 /* This would indicate a mistake on the design */
410 if (WARN(!is_world_regdom(user_alpha2
) && !is_an_alpha2(user_alpha2
),
411 "Unexpected user alpha2: %c%c\n",
412 user_alpha2
[0], user_alpha2
[1]))
418 static const struct ieee80211_regdomain
*
419 reg_copy_regd(const struct ieee80211_regdomain
*src_regd
)
421 struct ieee80211_regdomain
*regd
;
426 sizeof(struct ieee80211_regdomain
) +
427 src_regd
->n_reg_rules
* sizeof(struct ieee80211_reg_rule
);
429 regd
= kzalloc(size_of_regd
, GFP_KERNEL
);
431 return ERR_PTR(-ENOMEM
);
433 memcpy(regd
, src_regd
, sizeof(struct ieee80211_regdomain
));
435 for (i
= 0; i
< src_regd
->n_reg_rules
; i
++)
436 memcpy(®d
->reg_rules
[i
], &src_regd
->reg_rules
[i
],
437 sizeof(struct ieee80211_reg_rule
));
442 #ifdef CONFIG_CFG80211_INTERNAL_REGDB
443 struct reg_regdb_search_request
{
445 struct list_head list
;
448 static LIST_HEAD(reg_regdb_search_list
);
449 static DEFINE_MUTEX(reg_regdb_search_mutex
);
451 static void reg_regdb_search(struct work_struct
*work
)
453 struct reg_regdb_search_request
*request
;
454 const struct ieee80211_regdomain
*curdom
, *regdom
= NULL
;
459 mutex_lock(®_regdb_search_mutex
);
460 while (!list_empty(®_regdb_search_list
)) {
461 request
= list_first_entry(®_regdb_search_list
,
462 struct reg_regdb_search_request
,
464 list_del(&request
->list
);
466 for (i
= 0; i
< reg_regdb_size
; i
++) {
467 curdom
= reg_regdb
[i
];
469 if (alpha2_equal(request
->alpha2
, curdom
->alpha2
)) {
470 regdom
= reg_copy_regd(curdom
);
477 mutex_unlock(®_regdb_search_mutex
);
479 if (!IS_ERR_OR_NULL(regdom
))
485 static DECLARE_WORK(reg_regdb_work
, reg_regdb_search
);
487 static void reg_regdb_query(const char *alpha2
)
489 struct reg_regdb_search_request
*request
;
494 request
= kzalloc(sizeof(struct reg_regdb_search_request
), GFP_KERNEL
);
498 memcpy(request
->alpha2
, alpha2
, 2);
500 mutex_lock(®_regdb_search_mutex
);
501 list_add_tail(&request
->list
, ®_regdb_search_list
);
502 mutex_unlock(®_regdb_search_mutex
);
504 schedule_work(®_regdb_work
);
507 /* Feel free to add any other sanity checks here */
508 static void reg_regdb_size_check(void)
510 /* We should ideally BUILD_BUG_ON() but then random builds would fail */
511 WARN_ONCE(!reg_regdb_size
, "db.txt is empty, you should update it...");
514 static inline void reg_regdb_size_check(void) {}
515 static inline void reg_regdb_query(const char *alpha2
) {}
516 #endif /* CONFIG_CFG80211_INTERNAL_REGDB */
519 * This lets us keep regulatory code which is updated on a regulatory
520 * basis in userspace.
522 static int call_crda(const char *alpha2
)
525 char *env
[] = { country
, NULL
};
527 snprintf(country
, sizeof(country
), "COUNTRY=%c%c",
528 alpha2
[0], alpha2
[1]);
530 if (!is_world_regdom((char *) alpha2
))
531 pr_info("Calling CRDA for country: %c%c\n",
532 alpha2
[0], alpha2
[1]);
534 pr_info("Calling CRDA to update world regulatory domain\n");
536 /* query internal regulatory database (if it exists) */
537 reg_regdb_query(alpha2
);
539 return kobject_uevent_env(®_pdev
->dev
.kobj
, KOBJ_CHANGE
, env
);
542 static enum reg_request_treatment
543 reg_call_crda(struct regulatory_request
*request
)
545 if (call_crda(request
->alpha2
))
546 return REG_REQ_IGNORE
;
550 bool reg_is_valid_request(const char *alpha2
)
552 struct regulatory_request
*lr
= get_last_request();
554 if (!lr
|| lr
->processed
)
557 return alpha2_equal(lr
->alpha2
, alpha2
);
560 static const struct ieee80211_regdomain
*reg_get_regdomain(struct wiphy
*wiphy
)
562 struct regulatory_request
*lr
= get_last_request();
565 * Follow the driver's regulatory domain, if present, unless a country
566 * IE has been processed or a user wants to help complaince further
568 if (lr
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
569 lr
->initiator
!= NL80211_REGDOM_SET_BY_USER
&&
571 return get_wiphy_regdom(wiphy
);
573 return get_cfg80211_regdom();
577 reg_get_max_bandwidth_from_range(const struct ieee80211_regdomain
*rd
,
578 const struct ieee80211_reg_rule
*rule
)
580 const struct ieee80211_freq_range
*freq_range
= &rule
->freq_range
;
581 const struct ieee80211_freq_range
*freq_range_tmp
;
582 const struct ieee80211_reg_rule
*tmp
;
583 u32 start_freq
, end_freq
, idx
, no
;
585 for (idx
= 0; idx
< rd
->n_reg_rules
; idx
++)
586 if (rule
== &rd
->reg_rules
[idx
])
589 if (idx
== rd
->n_reg_rules
)
596 tmp
= &rd
->reg_rules
[--no
];
597 freq_range_tmp
= &tmp
->freq_range
;
599 if (freq_range_tmp
->end_freq_khz
< freq_range
->start_freq_khz
)
602 freq_range
= freq_range_tmp
;
605 start_freq
= freq_range
->start_freq_khz
;
608 freq_range
= &rule
->freq_range
;
611 while (no
< rd
->n_reg_rules
- 1) {
612 tmp
= &rd
->reg_rules
[++no
];
613 freq_range_tmp
= &tmp
->freq_range
;
615 if (freq_range_tmp
->start_freq_khz
> freq_range
->end_freq_khz
)
618 freq_range
= freq_range_tmp
;
621 end_freq
= freq_range
->end_freq_khz
;
623 return end_freq
- start_freq
;
626 unsigned int reg_get_max_bandwidth(const struct ieee80211_regdomain
*rd
,
627 const struct ieee80211_reg_rule
*rule
)
629 unsigned int bw
= reg_get_max_bandwidth_from_range(rd
, rule
);
631 if (rule
->flags
& NL80211_RRF_NO_160MHZ
)
632 bw
= min_t(unsigned int, bw
, MHZ_TO_KHZ(80));
633 if (rule
->flags
& NL80211_RRF_NO_80MHZ
)
634 bw
= min_t(unsigned int, bw
, MHZ_TO_KHZ(40));
637 * HT40+/HT40- limits are handled per-channel. Only limit BW if both
640 if (rule
->flags
& NL80211_RRF_NO_HT40MINUS
&&
641 rule
->flags
& NL80211_RRF_NO_HT40PLUS
)
642 bw
= min_t(unsigned int, bw
, MHZ_TO_KHZ(20));
647 /* Sanity check on a regulatory rule */
648 static bool is_valid_reg_rule(const struct ieee80211_reg_rule
*rule
)
650 const struct ieee80211_freq_range
*freq_range
= &rule
->freq_range
;
653 if (freq_range
->start_freq_khz
<= 0 || freq_range
->end_freq_khz
<= 0)
656 if (freq_range
->start_freq_khz
> freq_range
->end_freq_khz
)
659 freq_diff
= freq_range
->end_freq_khz
- freq_range
->start_freq_khz
;
661 if (freq_range
->end_freq_khz
<= freq_range
->start_freq_khz
||
662 freq_range
->max_bandwidth_khz
> freq_diff
)
668 static bool is_valid_rd(const struct ieee80211_regdomain
*rd
)
670 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
673 if (!rd
->n_reg_rules
)
676 if (WARN_ON(rd
->n_reg_rules
> NL80211_MAX_SUPP_REG_RULES
))
679 for (i
= 0; i
< rd
->n_reg_rules
; i
++) {
680 reg_rule
= &rd
->reg_rules
[i
];
681 if (!is_valid_reg_rule(reg_rule
))
688 static bool reg_does_bw_fit(const struct ieee80211_freq_range
*freq_range
,
689 u32 center_freq_khz
, u32 bw_khz
)
691 u32 start_freq_khz
, end_freq_khz
;
693 start_freq_khz
= center_freq_khz
- (bw_khz
/2);
694 end_freq_khz
= center_freq_khz
+ (bw_khz
/2);
696 if (start_freq_khz
>= freq_range
->start_freq_khz
&&
697 end_freq_khz
<= freq_range
->end_freq_khz
)
704 * freq_in_rule_band - tells us if a frequency is in a frequency band
705 * @freq_range: frequency rule we want to query
706 * @freq_khz: frequency we are inquiring about
708 * This lets us know if a specific frequency rule is or is not relevant to
709 * a specific frequency's band. Bands are device specific and artificial
710 * definitions (the "2.4 GHz band", the "5 GHz band" and the "60GHz band"),
711 * however it is safe for now to assume that a frequency rule should not be
712 * part of a frequency's band if the start freq or end freq are off by more
713 * than 2 GHz for the 2.4 and 5 GHz bands, and by more than 10 GHz for the
715 * This resolution can be lowered and should be considered as we add
716 * regulatory rule support for other "bands".
718 static bool freq_in_rule_band(const struct ieee80211_freq_range
*freq_range
,
721 #define ONE_GHZ_IN_KHZ 1000000
723 * From 802.11ad: directional multi-gigabit (DMG):
724 * Pertaining to operation in a frequency band containing a channel
725 * with the Channel starting frequency above 45 GHz.
727 u32 limit
= freq_khz
> 45 * ONE_GHZ_IN_KHZ
?
728 10 * ONE_GHZ_IN_KHZ
: 2 * ONE_GHZ_IN_KHZ
;
729 if (abs(freq_khz
- freq_range
->start_freq_khz
) <= limit
)
731 if (abs(freq_khz
- freq_range
->end_freq_khz
) <= limit
)
734 #undef ONE_GHZ_IN_KHZ
738 * Later on we can perhaps use the more restrictive DFS
739 * region but we don't have information for that yet so
740 * for now simply disallow conflicts.
742 static enum nl80211_dfs_regions
743 reg_intersect_dfs_region(const enum nl80211_dfs_regions dfs_region1
,
744 const enum nl80211_dfs_regions dfs_region2
)
746 if (dfs_region1
!= dfs_region2
)
747 return NL80211_DFS_UNSET
;
752 * Helper for regdom_intersect(), this does the real
753 * mathematical intersection fun
755 static int reg_rules_intersect(const struct ieee80211_regdomain
*rd1
,
756 const struct ieee80211_regdomain
*rd2
,
757 const struct ieee80211_reg_rule
*rule1
,
758 const struct ieee80211_reg_rule
*rule2
,
759 struct ieee80211_reg_rule
*intersected_rule
)
761 const struct ieee80211_freq_range
*freq_range1
, *freq_range2
;
762 struct ieee80211_freq_range
*freq_range
;
763 const struct ieee80211_power_rule
*power_rule1
, *power_rule2
;
764 struct ieee80211_power_rule
*power_rule
;
765 u32 freq_diff
, max_bandwidth1
, max_bandwidth2
;
767 freq_range1
= &rule1
->freq_range
;
768 freq_range2
= &rule2
->freq_range
;
769 freq_range
= &intersected_rule
->freq_range
;
771 power_rule1
= &rule1
->power_rule
;
772 power_rule2
= &rule2
->power_rule
;
773 power_rule
= &intersected_rule
->power_rule
;
775 freq_range
->start_freq_khz
= max(freq_range1
->start_freq_khz
,
776 freq_range2
->start_freq_khz
);
777 freq_range
->end_freq_khz
= min(freq_range1
->end_freq_khz
,
778 freq_range2
->end_freq_khz
);
780 max_bandwidth1
= freq_range1
->max_bandwidth_khz
;
781 max_bandwidth2
= freq_range2
->max_bandwidth_khz
;
783 if (rule1
->flags
& NL80211_RRF_AUTO_BW
)
784 max_bandwidth1
= reg_get_max_bandwidth(rd1
, rule1
);
785 if (rule2
->flags
& NL80211_RRF_AUTO_BW
)
786 max_bandwidth2
= reg_get_max_bandwidth(rd2
, rule2
);
788 freq_range
->max_bandwidth_khz
= min(max_bandwidth1
, max_bandwidth2
);
790 intersected_rule
->flags
= rule1
->flags
| rule2
->flags
;
793 * In case NL80211_RRF_AUTO_BW requested for both rules
794 * set AUTO_BW in intersected rule also. Next we will
795 * calculate BW correctly in handle_channel function.
796 * In other case remove AUTO_BW flag while we calculate
797 * maximum bandwidth correctly and auto calculation is
800 if ((rule1
->flags
& NL80211_RRF_AUTO_BW
) &&
801 (rule2
->flags
& NL80211_RRF_AUTO_BW
))
802 intersected_rule
->flags
|= NL80211_RRF_AUTO_BW
;
804 intersected_rule
->flags
&= ~NL80211_RRF_AUTO_BW
;
806 freq_diff
= freq_range
->end_freq_khz
- freq_range
->start_freq_khz
;
807 if (freq_range
->max_bandwidth_khz
> freq_diff
)
808 freq_range
->max_bandwidth_khz
= freq_diff
;
810 power_rule
->max_eirp
= min(power_rule1
->max_eirp
,
811 power_rule2
->max_eirp
);
812 power_rule
->max_antenna_gain
= min(power_rule1
->max_antenna_gain
,
813 power_rule2
->max_antenna_gain
);
815 intersected_rule
->dfs_cac_ms
= max(rule1
->dfs_cac_ms
,
818 if (!is_valid_reg_rule(intersected_rule
))
824 /* check whether old rule contains new rule */
825 static bool rule_contains(struct ieee80211_reg_rule
*r1
,
826 struct ieee80211_reg_rule
*r2
)
828 /* for simplicity, currently consider only same flags */
829 if (r1
->flags
!= r2
->flags
)
832 /* verify r1 is more restrictive */
833 if ((r1
->power_rule
.max_antenna_gain
>
834 r2
->power_rule
.max_antenna_gain
) ||
835 r1
->power_rule
.max_eirp
> r2
->power_rule
.max_eirp
)
838 /* make sure r2's range is contained within r1 */
839 if (r1
->freq_range
.start_freq_khz
> r2
->freq_range
.start_freq_khz
||
840 r1
->freq_range
.end_freq_khz
< r2
->freq_range
.end_freq_khz
)
843 /* and finally verify that r1.max_bw >= r2.max_bw */
844 if (r1
->freq_range
.max_bandwidth_khz
<
845 r2
->freq_range
.max_bandwidth_khz
)
851 /* add or extend current rules. do nothing if rule is already contained */
852 static void add_rule(struct ieee80211_reg_rule
*rule
,
853 struct ieee80211_reg_rule
*reg_rules
, u32
*n_rules
)
855 struct ieee80211_reg_rule
*tmp_rule
;
858 for (i
= 0; i
< *n_rules
; i
++) {
859 tmp_rule
= ®_rules
[i
];
860 /* rule is already contained - do nothing */
861 if (rule_contains(tmp_rule
, rule
))
864 /* extend rule if possible */
865 if (rule_contains(rule
, tmp_rule
)) {
866 memcpy(tmp_rule
, rule
, sizeof(*rule
));
871 memcpy(®_rules
[*n_rules
], rule
, sizeof(*rule
));
876 * regdom_intersect - do the intersection between two regulatory domains
877 * @rd1: first regulatory domain
878 * @rd2: second regulatory domain
880 * Use this function to get the intersection between two regulatory domains.
881 * Once completed we will mark the alpha2 for the rd as intersected, "98",
882 * as no one single alpha2 can represent this regulatory domain.
884 * Returns a pointer to the regulatory domain structure which will hold the
885 * resulting intersection of rules between rd1 and rd2. We will
886 * kzalloc() this structure for you.
888 static struct ieee80211_regdomain
*
889 regdom_intersect(const struct ieee80211_regdomain
*rd1
,
890 const struct ieee80211_regdomain
*rd2
)
894 unsigned int num_rules
= 0;
895 const struct ieee80211_reg_rule
*rule1
, *rule2
;
896 struct ieee80211_reg_rule intersected_rule
;
897 struct ieee80211_regdomain
*rd
;
903 * First we get a count of the rules we'll need, then we actually
904 * build them. This is to so we can malloc() and free() a
905 * regdomain once. The reason we use reg_rules_intersect() here
906 * is it will return -EINVAL if the rule computed makes no sense.
907 * All rules that do check out OK are valid.
910 for (x
= 0; x
< rd1
->n_reg_rules
; x
++) {
911 rule1
= &rd1
->reg_rules
[x
];
912 for (y
= 0; y
< rd2
->n_reg_rules
; y
++) {
913 rule2
= &rd2
->reg_rules
[y
];
914 if (!reg_rules_intersect(rd1
, rd2
, rule1
, rule2
,
923 size_of_regd
= sizeof(struct ieee80211_regdomain
) +
924 num_rules
* sizeof(struct ieee80211_reg_rule
);
926 rd
= kzalloc(size_of_regd
, GFP_KERNEL
);
930 for (x
= 0; x
< rd1
->n_reg_rules
; x
++) {
931 rule1
= &rd1
->reg_rules
[x
];
932 for (y
= 0; y
< rd2
->n_reg_rules
; y
++) {
933 rule2
= &rd2
->reg_rules
[y
];
934 r
= reg_rules_intersect(rd1
, rd2
, rule1
, rule2
,
937 * No need to memset here the intersected rule here as
938 * we're not using the stack anymore
943 add_rule(&intersected_rule
, rd
->reg_rules
,
950 rd
->dfs_region
= reg_intersect_dfs_region(rd1
->dfs_region
,
957 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
958 * want to just have the channel structure use these
960 static u32
map_regdom_flags(u32 rd_flags
)
962 u32 channel_flags
= 0;
963 if (rd_flags
& NL80211_RRF_NO_IR_ALL
)
964 channel_flags
|= IEEE80211_CHAN_NO_IR
;
965 if (rd_flags
& NL80211_RRF_DFS
)
966 channel_flags
|= IEEE80211_CHAN_RADAR
;
967 if (rd_flags
& NL80211_RRF_NO_OFDM
)
968 channel_flags
|= IEEE80211_CHAN_NO_OFDM
;
969 if (rd_flags
& NL80211_RRF_NO_OUTDOOR
)
970 channel_flags
|= IEEE80211_CHAN_INDOOR_ONLY
;
971 if (rd_flags
& NL80211_RRF_GO_CONCURRENT
)
972 channel_flags
|= IEEE80211_CHAN_GO_CONCURRENT
;
973 if (rd_flags
& NL80211_RRF_NO_HT40MINUS
)
974 channel_flags
|= IEEE80211_CHAN_NO_HT40MINUS
;
975 if (rd_flags
& NL80211_RRF_NO_HT40PLUS
)
976 channel_flags
|= IEEE80211_CHAN_NO_HT40PLUS
;
977 if (rd_flags
& NL80211_RRF_NO_80MHZ
)
978 channel_flags
|= IEEE80211_CHAN_NO_80MHZ
;
979 if (rd_flags
& NL80211_RRF_NO_160MHZ
)
980 channel_flags
|= IEEE80211_CHAN_NO_160MHZ
;
981 return channel_flags
;
984 static const struct ieee80211_reg_rule
*
985 freq_reg_info_regd(struct wiphy
*wiphy
, u32 center_freq
,
986 const struct ieee80211_regdomain
*regd
)
989 bool band_rule_found
= false;
990 bool bw_fits
= false;
993 return ERR_PTR(-EINVAL
);
995 for (i
= 0; i
< regd
->n_reg_rules
; i
++) {
996 const struct ieee80211_reg_rule
*rr
;
997 const struct ieee80211_freq_range
*fr
= NULL
;
999 rr
= ®d
->reg_rules
[i
];
1000 fr
= &rr
->freq_range
;
1003 * We only need to know if one frequency rule was
1004 * was in center_freq's band, that's enough, so lets
1005 * not overwrite it once found
1007 if (!band_rule_found
)
1008 band_rule_found
= freq_in_rule_band(fr
, center_freq
);
1010 bw_fits
= reg_does_bw_fit(fr
, center_freq
, MHZ_TO_KHZ(20));
1012 if (band_rule_found
&& bw_fits
)
1016 if (!band_rule_found
)
1017 return ERR_PTR(-ERANGE
);
1019 return ERR_PTR(-EINVAL
);
1022 const struct ieee80211_reg_rule
*freq_reg_info(struct wiphy
*wiphy
,
1025 const struct ieee80211_regdomain
*regd
;
1027 regd
= reg_get_regdomain(wiphy
);
1029 return freq_reg_info_regd(wiphy
, center_freq
, regd
);
1031 EXPORT_SYMBOL(freq_reg_info
);
1033 const char *reg_initiator_name(enum nl80211_reg_initiator initiator
)
1035 switch (initiator
) {
1036 case NL80211_REGDOM_SET_BY_CORE
:
1038 case NL80211_REGDOM_SET_BY_USER
:
1040 case NL80211_REGDOM_SET_BY_DRIVER
:
1042 case NL80211_REGDOM_SET_BY_COUNTRY_IE
:
1043 return "country IE";
1049 EXPORT_SYMBOL(reg_initiator_name
);
1051 #ifdef CONFIG_CFG80211_REG_DEBUG
1052 static void chan_reg_rule_print_dbg(const struct ieee80211_regdomain
*regd
,
1053 struct ieee80211_channel
*chan
,
1054 const struct ieee80211_reg_rule
*reg_rule
)
1056 const struct ieee80211_power_rule
*power_rule
;
1057 const struct ieee80211_freq_range
*freq_range
;
1058 char max_antenna_gain
[32], bw
[32];
1060 power_rule
= ®_rule
->power_rule
;
1061 freq_range
= ®_rule
->freq_range
;
1063 if (!power_rule
->max_antenna_gain
)
1064 snprintf(max_antenna_gain
, sizeof(max_antenna_gain
), "N/A");
1066 snprintf(max_antenna_gain
, sizeof(max_antenna_gain
), "%d",
1067 power_rule
->max_antenna_gain
);
1069 if (reg_rule
->flags
& NL80211_RRF_AUTO_BW
)
1070 snprintf(bw
, sizeof(bw
), "%d KHz, %d KHz AUTO",
1071 freq_range
->max_bandwidth_khz
,
1072 reg_get_max_bandwidth(regd
, reg_rule
));
1074 snprintf(bw
, sizeof(bw
), "%d KHz",
1075 freq_range
->max_bandwidth_khz
);
1077 REG_DBG_PRINT("Updating information on frequency %d MHz with regulatory rule:\n",
1080 REG_DBG_PRINT("%d KHz - %d KHz @ %s), (%s mBi, %d mBm)\n",
1081 freq_range
->start_freq_khz
, freq_range
->end_freq_khz
,
1082 bw
, max_antenna_gain
,
1083 power_rule
->max_eirp
);
1086 static void chan_reg_rule_print_dbg(const struct ieee80211_regdomain
*regd
,
1087 struct ieee80211_channel
*chan
,
1088 const struct ieee80211_reg_rule
*reg_rule
)
1095 * Note that right now we assume the desired channel bandwidth
1096 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
1097 * per channel, the primary and the extension channel).
1099 static void handle_channel(struct wiphy
*wiphy
,
1100 enum nl80211_reg_initiator initiator
,
1101 struct ieee80211_channel
*chan
)
1103 u32 flags
, bw_flags
= 0;
1104 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
1105 const struct ieee80211_power_rule
*power_rule
= NULL
;
1106 const struct ieee80211_freq_range
*freq_range
= NULL
;
1107 struct wiphy
*request_wiphy
= NULL
;
1108 struct regulatory_request
*lr
= get_last_request();
1109 const struct ieee80211_regdomain
*regd
;
1110 u32 max_bandwidth_khz
;
1112 request_wiphy
= wiphy_idx_to_wiphy(lr
->wiphy_idx
);
1114 flags
= chan
->orig_flags
;
1116 reg_rule
= freq_reg_info(wiphy
, MHZ_TO_KHZ(chan
->center_freq
));
1117 if (IS_ERR(reg_rule
)) {
1119 * We will disable all channels that do not match our
1120 * received regulatory rule unless the hint is coming
1121 * from a Country IE and the Country IE had no information
1122 * about a band. The IEEE 802.11 spec allows for an AP
1123 * to send only a subset of the regulatory rules allowed,
1124 * so an AP in the US that only supports 2.4 GHz may only send
1125 * a country IE with information for the 2.4 GHz band
1126 * while 5 GHz is still supported.
1128 if (initiator
== NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
1129 PTR_ERR(reg_rule
) == -ERANGE
)
1132 if (lr
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
&&
1133 request_wiphy
&& request_wiphy
== wiphy
&&
1134 request_wiphy
->regulatory_flags
& REGULATORY_STRICT_REG
) {
1135 REG_DBG_PRINT("Disabling freq %d MHz for good\n",
1137 chan
->orig_flags
|= IEEE80211_CHAN_DISABLED
;
1138 chan
->flags
= chan
->orig_flags
;
1140 REG_DBG_PRINT("Disabling freq %d MHz\n",
1142 chan
->flags
|= IEEE80211_CHAN_DISABLED
;
1147 regd
= reg_get_regdomain(wiphy
);
1148 chan_reg_rule_print_dbg(regd
, chan
, reg_rule
);
1150 power_rule
= ®_rule
->power_rule
;
1151 freq_range
= ®_rule
->freq_range
;
1153 max_bandwidth_khz
= freq_range
->max_bandwidth_khz
;
1154 /* Check if auto calculation requested */
1155 if (reg_rule
->flags
& NL80211_RRF_AUTO_BW
)
1156 max_bandwidth_khz
= reg_get_max_bandwidth(regd
, reg_rule
);
1158 if (max_bandwidth_khz
< MHZ_TO_KHZ(40))
1159 bw_flags
= IEEE80211_CHAN_NO_HT40
;
1160 if (max_bandwidth_khz
< MHZ_TO_KHZ(80))
1161 bw_flags
|= IEEE80211_CHAN_NO_80MHZ
;
1162 if (max_bandwidth_khz
< MHZ_TO_KHZ(160))
1163 bw_flags
|= IEEE80211_CHAN_NO_160MHZ
;
1165 if (lr
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
&&
1166 request_wiphy
&& request_wiphy
== wiphy
&&
1167 request_wiphy
->regulatory_flags
& REGULATORY_STRICT_REG
) {
1169 * This guarantees the driver's requested regulatory domain
1170 * will always be used as a base for further regulatory
1173 chan
->flags
= chan
->orig_flags
=
1174 map_regdom_flags(reg_rule
->flags
) | bw_flags
;
1175 chan
->max_antenna_gain
= chan
->orig_mag
=
1176 (int) MBI_TO_DBI(power_rule
->max_antenna_gain
);
1177 chan
->max_reg_power
= chan
->max_power
= chan
->orig_mpwr
=
1178 (int) MBM_TO_DBM(power_rule
->max_eirp
);
1180 if (chan
->flags
& IEEE80211_CHAN_RADAR
) {
1181 chan
->dfs_cac_ms
= IEEE80211_DFS_MIN_CAC_TIME_MS
;
1182 if (reg_rule
->dfs_cac_ms
)
1183 chan
->dfs_cac_ms
= reg_rule
->dfs_cac_ms
;
1189 chan
->dfs_state
= NL80211_DFS_USABLE
;
1190 chan
->dfs_state_entered
= jiffies
;
1192 chan
->beacon_found
= false;
1193 chan
->flags
= flags
| bw_flags
| map_regdom_flags(reg_rule
->flags
);
1194 chan
->max_antenna_gain
=
1195 min_t(int, chan
->orig_mag
,
1196 MBI_TO_DBI(power_rule
->max_antenna_gain
));
1197 chan
->max_reg_power
= (int) MBM_TO_DBM(power_rule
->max_eirp
);
1199 if (chan
->flags
& IEEE80211_CHAN_RADAR
) {
1200 if (reg_rule
->dfs_cac_ms
)
1201 chan
->dfs_cac_ms
= reg_rule
->dfs_cac_ms
;
1203 chan
->dfs_cac_ms
= IEEE80211_DFS_MIN_CAC_TIME_MS
;
1206 if (chan
->orig_mpwr
) {
1208 * Devices that use REGULATORY_COUNTRY_IE_FOLLOW_POWER
1209 * will always follow the passed country IE power settings.
1211 if (initiator
== NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
1212 wiphy
->regulatory_flags
& REGULATORY_COUNTRY_IE_FOLLOW_POWER
)
1213 chan
->max_power
= chan
->max_reg_power
;
1215 chan
->max_power
= min(chan
->orig_mpwr
,
1216 chan
->max_reg_power
);
1218 chan
->max_power
= chan
->max_reg_power
;
1221 static void handle_band(struct wiphy
*wiphy
,
1222 enum nl80211_reg_initiator initiator
,
1223 struct ieee80211_supported_band
*sband
)
1230 for (i
= 0; i
< sband
->n_channels
; i
++)
1231 handle_channel(wiphy
, initiator
, &sband
->channels
[i
]);
1234 static bool reg_request_cell_base(struct regulatory_request
*request
)
1236 if (request
->initiator
!= NL80211_REGDOM_SET_BY_USER
)
1238 return request
->user_reg_hint_type
== NL80211_USER_REG_HINT_CELL_BASE
;
1241 static bool reg_request_indoor(struct regulatory_request
*request
)
1243 if (request
->initiator
!= NL80211_REGDOM_SET_BY_USER
)
1245 return request
->user_reg_hint_type
== NL80211_USER_REG_HINT_INDOOR
;
1248 bool reg_last_request_cell_base(void)
1250 return reg_request_cell_base(get_last_request());
1253 #ifdef CONFIG_CFG80211_REG_CELLULAR_HINTS
1254 /* Core specific check */
1255 static enum reg_request_treatment
1256 reg_ignore_cell_hint(struct regulatory_request
*pending_request
)
1258 struct regulatory_request
*lr
= get_last_request();
1260 if (!reg_num_devs_support_basehint
)
1261 return REG_REQ_IGNORE
;
1263 if (reg_request_cell_base(lr
) &&
1264 !regdom_changes(pending_request
->alpha2
))
1265 return REG_REQ_ALREADY_SET
;
1270 /* Device specific check */
1271 static bool reg_dev_ignore_cell_hint(struct wiphy
*wiphy
)
1273 return !(wiphy
->features
& NL80211_FEATURE_CELL_BASE_REG_HINTS
);
1276 static int reg_ignore_cell_hint(struct regulatory_request
*pending_request
)
1278 return REG_REQ_IGNORE
;
1281 static bool reg_dev_ignore_cell_hint(struct wiphy
*wiphy
)
1287 static bool wiphy_strict_alpha2_regd(struct wiphy
*wiphy
)
1289 if (wiphy
->regulatory_flags
& REGULATORY_STRICT_REG
&&
1290 !(wiphy
->regulatory_flags
& REGULATORY_CUSTOM_REG
))
1295 static bool ignore_reg_update(struct wiphy
*wiphy
,
1296 enum nl80211_reg_initiator initiator
)
1298 struct regulatory_request
*lr
= get_last_request();
1301 REG_DBG_PRINT("Ignoring regulatory request set by %s "
1302 "since last_request is not set\n",
1303 reg_initiator_name(initiator
));
1307 if (initiator
== NL80211_REGDOM_SET_BY_CORE
&&
1308 wiphy
->regulatory_flags
& REGULATORY_CUSTOM_REG
) {
1309 REG_DBG_PRINT("Ignoring regulatory request set by %s "
1310 "since the driver uses its own custom "
1311 "regulatory domain\n",
1312 reg_initiator_name(initiator
));
1317 * wiphy->regd will be set once the device has its own
1318 * desired regulatory domain set
1320 if (wiphy_strict_alpha2_regd(wiphy
) && !wiphy
->regd
&&
1321 initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
1322 !is_world_regdom(lr
->alpha2
)) {
1323 REG_DBG_PRINT("Ignoring regulatory request set by %s "
1324 "since the driver requires its own regulatory "
1325 "domain to be set first\n",
1326 reg_initiator_name(initiator
));
1330 if (reg_request_cell_base(lr
))
1331 return reg_dev_ignore_cell_hint(wiphy
);
1336 static bool reg_is_world_roaming(struct wiphy
*wiphy
)
1338 const struct ieee80211_regdomain
*cr
= get_cfg80211_regdom();
1339 const struct ieee80211_regdomain
*wr
= get_wiphy_regdom(wiphy
);
1340 struct regulatory_request
*lr
= get_last_request();
1342 if (is_world_regdom(cr
->alpha2
) || (wr
&& is_world_regdom(wr
->alpha2
)))
1345 if (lr
&& lr
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
1346 wiphy
->regulatory_flags
& REGULATORY_CUSTOM_REG
)
1352 static void handle_reg_beacon(struct wiphy
*wiphy
, unsigned int chan_idx
,
1353 struct reg_beacon
*reg_beacon
)
1355 struct ieee80211_supported_band
*sband
;
1356 struct ieee80211_channel
*chan
;
1357 bool channel_changed
= false;
1358 struct ieee80211_channel chan_before
;
1360 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
1361 chan
= &sband
->channels
[chan_idx
];
1363 if (likely(chan
->center_freq
!= reg_beacon
->chan
.center_freq
))
1366 if (chan
->beacon_found
)
1369 chan
->beacon_found
= true;
1371 if (!reg_is_world_roaming(wiphy
))
1374 if (wiphy
->regulatory_flags
& REGULATORY_DISABLE_BEACON_HINTS
)
1377 chan_before
.center_freq
= chan
->center_freq
;
1378 chan_before
.flags
= chan
->flags
;
1380 if (chan
->flags
& IEEE80211_CHAN_NO_IR
) {
1381 chan
->flags
&= ~IEEE80211_CHAN_NO_IR
;
1382 channel_changed
= true;
1385 if (channel_changed
)
1386 nl80211_send_beacon_hint_event(wiphy
, &chan_before
, chan
);
1390 * Called when a scan on a wiphy finds a beacon on
1393 static void wiphy_update_new_beacon(struct wiphy
*wiphy
,
1394 struct reg_beacon
*reg_beacon
)
1397 struct ieee80211_supported_band
*sband
;
1399 if (!wiphy
->bands
[reg_beacon
->chan
.band
])
1402 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
1404 for (i
= 0; i
< sband
->n_channels
; i
++)
1405 handle_reg_beacon(wiphy
, i
, reg_beacon
);
1409 * Called upon reg changes or a new wiphy is added
1411 static void wiphy_update_beacon_reg(struct wiphy
*wiphy
)
1414 struct ieee80211_supported_band
*sband
;
1415 struct reg_beacon
*reg_beacon
;
1417 list_for_each_entry(reg_beacon
, ®_beacon_list
, list
) {
1418 if (!wiphy
->bands
[reg_beacon
->chan
.band
])
1420 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
1421 for (i
= 0; i
< sband
->n_channels
; i
++)
1422 handle_reg_beacon(wiphy
, i
, reg_beacon
);
1426 /* Reap the advantages of previously found beacons */
1427 static void reg_process_beacons(struct wiphy
*wiphy
)
1430 * Means we are just firing up cfg80211, so no beacons would
1431 * have been processed yet.
1435 wiphy_update_beacon_reg(wiphy
);
1438 static bool is_ht40_allowed(struct ieee80211_channel
*chan
)
1442 if (chan
->flags
& IEEE80211_CHAN_DISABLED
)
1444 /* This would happen when regulatory rules disallow HT40 completely */
1445 if ((chan
->flags
& IEEE80211_CHAN_NO_HT40
) == IEEE80211_CHAN_NO_HT40
)
1450 static void reg_process_ht_flags_channel(struct wiphy
*wiphy
,
1451 struct ieee80211_channel
*channel
)
1453 struct ieee80211_supported_band
*sband
= wiphy
->bands
[channel
->band
];
1454 struct ieee80211_channel
*channel_before
= NULL
, *channel_after
= NULL
;
1457 if (!is_ht40_allowed(channel
)) {
1458 channel
->flags
|= IEEE80211_CHAN_NO_HT40
;
1463 * We need to ensure the extension channels exist to
1464 * be able to use HT40- or HT40+, this finds them (or not)
1466 for (i
= 0; i
< sband
->n_channels
; i
++) {
1467 struct ieee80211_channel
*c
= &sband
->channels
[i
];
1469 if (c
->center_freq
== (channel
->center_freq
- 20))
1471 if (c
->center_freq
== (channel
->center_freq
+ 20))
1476 * Please note that this assumes target bandwidth is 20 MHz,
1477 * if that ever changes we also need to change the below logic
1478 * to include that as well.
1480 if (!is_ht40_allowed(channel_before
))
1481 channel
->flags
|= IEEE80211_CHAN_NO_HT40MINUS
;
1483 channel
->flags
&= ~IEEE80211_CHAN_NO_HT40MINUS
;
1485 if (!is_ht40_allowed(channel_after
))
1486 channel
->flags
|= IEEE80211_CHAN_NO_HT40PLUS
;
1488 channel
->flags
&= ~IEEE80211_CHAN_NO_HT40PLUS
;
1491 static void reg_process_ht_flags_band(struct wiphy
*wiphy
,
1492 struct ieee80211_supported_band
*sband
)
1499 for (i
= 0; i
< sband
->n_channels
; i
++)
1500 reg_process_ht_flags_channel(wiphy
, &sband
->channels
[i
]);
1503 static void reg_process_ht_flags(struct wiphy
*wiphy
)
1505 enum ieee80211_band band
;
1510 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++)
1511 reg_process_ht_flags_band(wiphy
, wiphy
->bands
[band
]);
1514 static void reg_call_notifier(struct wiphy
*wiphy
,
1515 struct regulatory_request
*request
)
1517 if (wiphy
->reg_notifier
)
1518 wiphy
->reg_notifier(wiphy
, request
);
1521 static void wiphy_update_regulatory(struct wiphy
*wiphy
,
1522 enum nl80211_reg_initiator initiator
)
1524 enum ieee80211_band band
;
1525 struct regulatory_request
*lr
= get_last_request();
1527 if (ignore_reg_update(wiphy
, initiator
)) {
1529 * Regulatory updates set by CORE are ignored for custom
1530 * regulatory cards. Let us notify the changes to the driver,
1531 * as some drivers used this to restore its orig_* reg domain.
1533 if (initiator
== NL80211_REGDOM_SET_BY_CORE
&&
1534 wiphy
->regulatory_flags
& REGULATORY_CUSTOM_REG
)
1535 reg_call_notifier(wiphy
, lr
);
1539 lr
->dfs_region
= get_cfg80211_regdom()->dfs_region
;
1541 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++)
1542 handle_band(wiphy
, initiator
, wiphy
->bands
[band
]);
1544 reg_process_beacons(wiphy
);
1545 reg_process_ht_flags(wiphy
);
1546 reg_call_notifier(wiphy
, lr
);
1549 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator
)
1551 struct cfg80211_registered_device
*rdev
;
1552 struct wiphy
*wiphy
;
1556 list_for_each_entry(rdev
, &cfg80211_rdev_list
, list
) {
1557 wiphy
= &rdev
->wiphy
;
1558 wiphy_update_regulatory(wiphy
, initiator
);
1562 static void handle_channel_custom(struct wiphy
*wiphy
,
1563 struct ieee80211_channel
*chan
,
1564 const struct ieee80211_regdomain
*regd
)
1567 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
1568 const struct ieee80211_power_rule
*power_rule
= NULL
;
1569 const struct ieee80211_freq_range
*freq_range
= NULL
;
1570 u32 max_bandwidth_khz
;
1572 reg_rule
= freq_reg_info_regd(wiphy
, MHZ_TO_KHZ(chan
->center_freq
),
1575 if (IS_ERR(reg_rule
)) {
1576 REG_DBG_PRINT("Disabling freq %d MHz as custom regd has no rule that fits it\n",
1578 chan
->orig_flags
|= IEEE80211_CHAN_DISABLED
;
1579 chan
->flags
= chan
->orig_flags
;
1583 chan_reg_rule_print_dbg(regd
, chan
, reg_rule
);
1585 power_rule
= ®_rule
->power_rule
;
1586 freq_range
= ®_rule
->freq_range
;
1588 max_bandwidth_khz
= freq_range
->max_bandwidth_khz
;
1589 /* Check if auto calculation requested */
1590 if (reg_rule
->flags
& NL80211_RRF_AUTO_BW
)
1591 max_bandwidth_khz
= reg_get_max_bandwidth(regd
, reg_rule
);
1593 if (max_bandwidth_khz
< MHZ_TO_KHZ(40))
1594 bw_flags
= IEEE80211_CHAN_NO_HT40
;
1595 if (max_bandwidth_khz
< MHZ_TO_KHZ(80))
1596 bw_flags
|= IEEE80211_CHAN_NO_80MHZ
;
1597 if (max_bandwidth_khz
< MHZ_TO_KHZ(160))
1598 bw_flags
|= IEEE80211_CHAN_NO_160MHZ
;
1600 chan
->dfs_state_entered
= jiffies
;
1601 chan
->dfs_state
= NL80211_DFS_USABLE
;
1603 chan
->beacon_found
= false;
1604 chan
->flags
|= map_regdom_flags(reg_rule
->flags
) | bw_flags
;
1605 chan
->max_antenna_gain
= (int) MBI_TO_DBI(power_rule
->max_antenna_gain
);
1606 chan
->max_reg_power
= chan
->max_power
=
1607 (int) MBM_TO_DBM(power_rule
->max_eirp
);
1609 if (chan
->flags
& IEEE80211_CHAN_RADAR
) {
1610 if (reg_rule
->dfs_cac_ms
)
1611 chan
->dfs_cac_ms
= reg_rule
->dfs_cac_ms
;
1613 chan
->dfs_cac_ms
= IEEE80211_DFS_MIN_CAC_TIME_MS
;
1616 chan
->max_power
= chan
->max_reg_power
;
1619 static void handle_band_custom(struct wiphy
*wiphy
,
1620 struct ieee80211_supported_band
*sband
,
1621 const struct ieee80211_regdomain
*regd
)
1628 for (i
= 0; i
< sband
->n_channels
; i
++)
1629 handle_channel_custom(wiphy
, &sband
->channels
[i
], regd
);
1632 /* Used by drivers prior to wiphy registration */
1633 void wiphy_apply_custom_regulatory(struct wiphy
*wiphy
,
1634 const struct ieee80211_regdomain
*regd
)
1636 enum ieee80211_band band
;
1637 unsigned int bands_set
= 0;
1639 WARN(!(wiphy
->regulatory_flags
& REGULATORY_CUSTOM_REG
),
1640 "wiphy should have REGULATORY_CUSTOM_REG\n");
1641 wiphy
->regulatory_flags
|= REGULATORY_CUSTOM_REG
;
1643 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
1644 if (!wiphy
->bands
[band
])
1646 handle_band_custom(wiphy
, wiphy
->bands
[band
], regd
);
1651 * no point in calling this if it won't have any effect
1652 * on your device's supported bands.
1654 WARN_ON(!bands_set
);
1656 EXPORT_SYMBOL(wiphy_apply_custom_regulatory
);
1658 static void reg_set_request_processed(void)
1660 bool need_more_processing
= false;
1661 struct regulatory_request
*lr
= get_last_request();
1663 lr
->processed
= true;
1665 spin_lock(®_requests_lock
);
1666 if (!list_empty(®_requests_list
))
1667 need_more_processing
= true;
1668 spin_unlock(®_requests_lock
);
1670 if (lr
->initiator
== NL80211_REGDOM_SET_BY_USER
)
1671 cancel_delayed_work(®_timeout
);
1673 if (need_more_processing
)
1674 schedule_work(®_work
);
1678 * reg_process_hint_core - process core regulatory requests
1679 * @pending_request: a pending core regulatory request
1681 * The wireless subsystem can use this function to process
1682 * a regulatory request issued by the regulatory core.
1684 * Returns one of the different reg request treatment values.
1686 static enum reg_request_treatment
1687 reg_process_hint_core(struct regulatory_request
*core_request
)
1690 core_request
->intersect
= false;
1691 core_request
->processed
= false;
1693 reg_update_last_request(core_request
);
1695 return reg_call_crda(core_request
);
1698 static enum reg_request_treatment
1699 __reg_process_hint_user(struct regulatory_request
*user_request
)
1701 struct regulatory_request
*lr
= get_last_request();
1703 if (reg_request_indoor(user_request
)) {
1704 reg_is_indoor
= true;
1705 return REG_REQ_USER_HINT_HANDLED
;
1708 if (reg_request_cell_base(user_request
))
1709 return reg_ignore_cell_hint(user_request
);
1711 if (reg_request_cell_base(lr
))
1712 return REG_REQ_IGNORE
;
1714 if (lr
->initiator
== NL80211_REGDOM_SET_BY_COUNTRY_IE
)
1715 return REG_REQ_INTERSECT
;
1717 * If the user knows better the user should set the regdom
1718 * to their country before the IE is picked up
1720 if (lr
->initiator
== NL80211_REGDOM_SET_BY_USER
&&
1722 return REG_REQ_IGNORE
;
1724 * Process user requests only after previous user/driver/core
1725 * requests have been processed
1727 if ((lr
->initiator
== NL80211_REGDOM_SET_BY_CORE
||
1728 lr
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
||
1729 lr
->initiator
== NL80211_REGDOM_SET_BY_USER
) &&
1730 regdom_changes(lr
->alpha2
))
1731 return REG_REQ_IGNORE
;
1733 if (!regdom_changes(user_request
->alpha2
))
1734 return REG_REQ_ALREADY_SET
;
1740 * reg_process_hint_user - process user regulatory requests
1741 * @user_request: a pending user regulatory request
1743 * The wireless subsystem can use this function to process
1744 * a regulatory request initiated by userspace.
1746 * Returns one of the different reg request treatment values.
1748 static enum reg_request_treatment
1749 reg_process_hint_user(struct regulatory_request
*user_request
)
1751 enum reg_request_treatment treatment
;
1753 treatment
= __reg_process_hint_user(user_request
);
1754 if (treatment
== REG_REQ_IGNORE
||
1755 treatment
== REG_REQ_ALREADY_SET
||
1756 treatment
== REG_REQ_USER_HINT_HANDLED
) {
1757 reg_free_request(user_request
);
1761 user_request
->intersect
= treatment
== REG_REQ_INTERSECT
;
1762 user_request
->processed
= false;
1764 reg_update_last_request(user_request
);
1766 user_alpha2
[0] = user_request
->alpha2
[0];
1767 user_alpha2
[1] = user_request
->alpha2
[1];
1769 return reg_call_crda(user_request
);
1772 static enum reg_request_treatment
1773 __reg_process_hint_driver(struct regulatory_request
*driver_request
)
1775 struct regulatory_request
*lr
= get_last_request();
1777 if (lr
->initiator
== NL80211_REGDOM_SET_BY_CORE
) {
1778 if (regdom_changes(driver_request
->alpha2
))
1780 return REG_REQ_ALREADY_SET
;
1784 * This would happen if you unplug and plug your card
1785 * back in or if you add a new device for which the previously
1786 * loaded card also agrees on the regulatory domain.
1788 if (lr
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
&&
1789 !regdom_changes(driver_request
->alpha2
))
1790 return REG_REQ_ALREADY_SET
;
1792 return REG_REQ_INTERSECT
;
1796 * reg_process_hint_driver - process driver regulatory requests
1797 * @driver_request: a pending driver regulatory request
1799 * The wireless subsystem can use this function to process
1800 * a regulatory request issued by an 802.11 driver.
1802 * Returns one of the different reg request treatment values.
1804 static enum reg_request_treatment
1805 reg_process_hint_driver(struct wiphy
*wiphy
,
1806 struct regulatory_request
*driver_request
)
1808 const struct ieee80211_regdomain
*regd
;
1809 enum reg_request_treatment treatment
;
1811 treatment
= __reg_process_hint_driver(driver_request
);
1813 switch (treatment
) {
1816 case REG_REQ_IGNORE
:
1817 case REG_REQ_USER_HINT_HANDLED
:
1818 reg_free_request(driver_request
);
1820 case REG_REQ_INTERSECT
:
1822 case REG_REQ_ALREADY_SET
:
1823 regd
= reg_copy_regd(get_cfg80211_regdom());
1825 reg_free_request(driver_request
);
1826 return REG_REQ_IGNORE
;
1828 rcu_assign_pointer(wiphy
->regd
, regd
);
1832 driver_request
->intersect
= treatment
== REG_REQ_INTERSECT
;
1833 driver_request
->processed
= false;
1835 reg_update_last_request(driver_request
);
1838 * Since CRDA will not be called in this case as we already
1839 * have applied the requested regulatory domain before we just
1840 * inform userspace we have processed the request
1842 if (treatment
== REG_REQ_ALREADY_SET
) {
1843 nl80211_send_reg_change_event(driver_request
);
1844 reg_set_request_processed();
1848 return reg_call_crda(driver_request
);
1851 static enum reg_request_treatment
1852 __reg_process_hint_country_ie(struct wiphy
*wiphy
,
1853 struct regulatory_request
*country_ie_request
)
1855 struct wiphy
*last_wiphy
= NULL
;
1856 struct regulatory_request
*lr
= get_last_request();
1858 if (reg_request_cell_base(lr
)) {
1859 /* Trust a Cell base station over the AP's country IE */
1860 if (regdom_changes(country_ie_request
->alpha2
))
1861 return REG_REQ_IGNORE
;
1862 return REG_REQ_ALREADY_SET
;
1864 if (wiphy
->regulatory_flags
& REGULATORY_COUNTRY_IE_IGNORE
)
1865 return REG_REQ_IGNORE
;
1868 if (unlikely(!is_an_alpha2(country_ie_request
->alpha2
)))
1871 if (lr
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
)
1874 last_wiphy
= wiphy_idx_to_wiphy(lr
->wiphy_idx
);
1876 if (last_wiphy
!= wiphy
) {
1878 * Two cards with two APs claiming different
1879 * Country IE alpha2s. We could
1880 * intersect them, but that seems unlikely
1881 * to be correct. Reject second one for now.
1883 if (regdom_changes(country_ie_request
->alpha2
))
1884 return REG_REQ_IGNORE
;
1885 return REG_REQ_ALREADY_SET
;
1888 * Two consecutive Country IE hints on the same wiphy.
1889 * This should be picked up early by the driver/stack
1891 if (WARN_ON(regdom_changes(country_ie_request
->alpha2
)))
1893 return REG_REQ_ALREADY_SET
;
1897 * reg_process_hint_country_ie - process regulatory requests from country IEs
1898 * @country_ie_request: a regulatory request from a country IE
1900 * The wireless subsystem can use this function to process
1901 * a regulatory request issued by a country Information Element.
1903 * Returns one of the different reg request treatment values.
1905 static enum reg_request_treatment
1906 reg_process_hint_country_ie(struct wiphy
*wiphy
,
1907 struct regulatory_request
*country_ie_request
)
1909 enum reg_request_treatment treatment
;
1911 treatment
= __reg_process_hint_country_ie(wiphy
, country_ie_request
);
1913 switch (treatment
) {
1916 case REG_REQ_IGNORE
:
1917 case REG_REQ_USER_HINT_HANDLED
:
1919 case REG_REQ_ALREADY_SET
:
1920 reg_free_request(country_ie_request
);
1922 case REG_REQ_INTERSECT
:
1923 reg_free_request(country_ie_request
);
1925 * This doesn't happen yet, not sure we
1926 * ever want to support it for this case.
1928 WARN_ONCE(1, "Unexpected intersection for country IEs");
1929 return REG_REQ_IGNORE
;
1932 country_ie_request
->intersect
= false;
1933 country_ie_request
->processed
= false;
1935 reg_update_last_request(country_ie_request
);
1937 return reg_call_crda(country_ie_request
);
1940 /* This processes *all* regulatory hints */
1941 static void reg_process_hint(struct regulatory_request
*reg_request
)
1943 struct wiphy
*wiphy
= NULL
;
1944 enum reg_request_treatment treatment
;
1946 if (reg_request
->wiphy_idx
!= WIPHY_IDX_INVALID
)
1947 wiphy
= wiphy_idx_to_wiphy(reg_request
->wiphy_idx
);
1949 switch (reg_request
->initiator
) {
1950 case NL80211_REGDOM_SET_BY_CORE
:
1951 reg_process_hint_core(reg_request
);
1953 case NL80211_REGDOM_SET_BY_USER
:
1954 treatment
= reg_process_hint_user(reg_request
);
1955 if (treatment
== REG_REQ_IGNORE
||
1956 treatment
== REG_REQ_ALREADY_SET
||
1957 treatment
== REG_REQ_USER_HINT_HANDLED
)
1959 queue_delayed_work(system_power_efficient_wq
,
1960 ®_timeout
, msecs_to_jiffies(3142));
1962 case NL80211_REGDOM_SET_BY_DRIVER
:
1965 treatment
= reg_process_hint_driver(wiphy
, reg_request
);
1967 case NL80211_REGDOM_SET_BY_COUNTRY_IE
:
1970 treatment
= reg_process_hint_country_ie(wiphy
, reg_request
);
1973 WARN(1, "invalid initiator %d\n", reg_request
->initiator
);
1977 /* This is required so that the orig_* parameters are saved */
1978 if (treatment
== REG_REQ_ALREADY_SET
&& wiphy
&&
1979 wiphy
->regulatory_flags
& REGULATORY_STRICT_REG
)
1980 wiphy_update_regulatory(wiphy
, reg_request
->initiator
);
1985 reg_free_request(reg_request
);
1989 * Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_*
1990 * Regulatory hints come on a first come first serve basis and we
1991 * must process each one atomically.
1993 static void reg_process_pending_hints(void)
1995 struct regulatory_request
*reg_request
, *lr
;
1997 lr
= get_last_request();
1999 /* When last_request->processed becomes true this will be rescheduled */
2000 if (lr
&& !lr
->processed
) {
2001 reg_process_hint(lr
);
2005 spin_lock(®_requests_lock
);
2007 if (list_empty(®_requests_list
)) {
2008 spin_unlock(®_requests_lock
);
2012 reg_request
= list_first_entry(®_requests_list
,
2013 struct regulatory_request
,
2015 list_del_init(®_request
->list
);
2017 spin_unlock(®_requests_lock
);
2019 reg_process_hint(reg_request
);
2022 /* Processes beacon hints -- this has nothing to do with country IEs */
2023 static void reg_process_pending_beacon_hints(void)
2025 struct cfg80211_registered_device
*rdev
;
2026 struct reg_beacon
*pending_beacon
, *tmp
;
2028 /* This goes through the _pending_ beacon list */
2029 spin_lock_bh(®_pending_beacons_lock
);
2031 list_for_each_entry_safe(pending_beacon
, tmp
,
2032 ®_pending_beacons
, list
) {
2033 list_del_init(&pending_beacon
->list
);
2035 /* Applies the beacon hint to current wiphys */
2036 list_for_each_entry(rdev
, &cfg80211_rdev_list
, list
)
2037 wiphy_update_new_beacon(&rdev
->wiphy
, pending_beacon
);
2039 /* Remembers the beacon hint for new wiphys or reg changes */
2040 list_add_tail(&pending_beacon
->list
, ®_beacon_list
);
2043 spin_unlock_bh(®_pending_beacons_lock
);
2046 static void reg_todo(struct work_struct
*work
)
2049 reg_process_pending_hints();
2050 reg_process_pending_beacon_hints();
2054 static void queue_regulatory_request(struct regulatory_request
*request
)
2056 request
->alpha2
[0] = toupper(request
->alpha2
[0]);
2057 request
->alpha2
[1] = toupper(request
->alpha2
[1]);
2059 spin_lock(®_requests_lock
);
2060 list_add_tail(&request
->list
, ®_requests_list
);
2061 spin_unlock(®_requests_lock
);
2063 schedule_work(®_work
);
2067 * Core regulatory hint -- happens during cfg80211_init()
2068 * and when we restore regulatory settings.
2070 static int regulatory_hint_core(const char *alpha2
)
2072 struct regulatory_request
*request
;
2074 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
2078 request
->alpha2
[0] = alpha2
[0];
2079 request
->alpha2
[1] = alpha2
[1];
2080 request
->initiator
= NL80211_REGDOM_SET_BY_CORE
;
2082 queue_regulatory_request(request
);
2088 int regulatory_hint_user(const char *alpha2
,
2089 enum nl80211_user_reg_hint_type user_reg_hint_type
)
2091 struct regulatory_request
*request
;
2093 if (WARN_ON(!alpha2
))
2096 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
2100 request
->wiphy_idx
= WIPHY_IDX_INVALID
;
2101 request
->alpha2
[0] = alpha2
[0];
2102 request
->alpha2
[1] = alpha2
[1];
2103 request
->initiator
= NL80211_REGDOM_SET_BY_USER
;
2104 request
->user_reg_hint_type
= user_reg_hint_type
;
2106 queue_regulatory_request(request
);
2111 int regulatory_hint_indoor_user(void)
2113 struct regulatory_request
*request
;
2115 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
2119 request
->wiphy_idx
= WIPHY_IDX_INVALID
;
2120 request
->initiator
= NL80211_REGDOM_SET_BY_USER
;
2121 request
->user_reg_hint_type
= NL80211_USER_REG_HINT_INDOOR
;
2122 queue_regulatory_request(request
);
2128 int regulatory_hint(struct wiphy
*wiphy
, const char *alpha2
)
2130 struct regulatory_request
*request
;
2132 if (WARN_ON(!alpha2
|| !wiphy
))
2135 wiphy
->regulatory_flags
&= ~REGULATORY_CUSTOM_REG
;
2137 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
2141 request
->wiphy_idx
= get_wiphy_idx(wiphy
);
2143 request
->alpha2
[0] = alpha2
[0];
2144 request
->alpha2
[1] = alpha2
[1];
2145 request
->initiator
= NL80211_REGDOM_SET_BY_DRIVER
;
2147 queue_regulatory_request(request
);
2151 EXPORT_SYMBOL(regulatory_hint
);
2153 void regulatory_hint_country_ie(struct wiphy
*wiphy
, enum ieee80211_band band
,
2154 const u8
*country_ie
, u8 country_ie_len
)
2157 enum environment_cap env
= ENVIRON_ANY
;
2158 struct regulatory_request
*request
= NULL
, *lr
;
2160 /* IE len must be evenly divisible by 2 */
2161 if (country_ie_len
& 0x01)
2164 if (country_ie_len
< IEEE80211_COUNTRY_IE_MIN_LEN
)
2167 request
= kzalloc(sizeof(*request
), GFP_KERNEL
);
2171 alpha2
[0] = country_ie
[0];
2172 alpha2
[1] = country_ie
[1];
2174 if (country_ie
[2] == 'I')
2175 env
= ENVIRON_INDOOR
;
2176 else if (country_ie
[2] == 'O')
2177 env
= ENVIRON_OUTDOOR
;
2180 lr
= get_last_request();
2186 * We will run this only upon a successful connection on cfg80211.
2187 * We leave conflict resolution to the workqueue, where can hold
2190 if (lr
->initiator
== NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
2191 lr
->wiphy_idx
!= WIPHY_IDX_INVALID
)
2194 request
->wiphy_idx
= get_wiphy_idx(wiphy
);
2195 request
->alpha2
[0] = alpha2
[0];
2196 request
->alpha2
[1] = alpha2
[1];
2197 request
->initiator
= NL80211_REGDOM_SET_BY_COUNTRY_IE
;
2198 request
->country_ie_env
= env
;
2200 queue_regulatory_request(request
);
2207 static void restore_alpha2(char *alpha2
, bool reset_user
)
2209 /* indicates there is no alpha2 to consider for restoration */
2213 /* The user setting has precedence over the module parameter */
2214 if (is_user_regdom_saved()) {
2215 /* Unless we're asked to ignore it and reset it */
2217 REG_DBG_PRINT("Restoring regulatory settings including user preference\n");
2218 user_alpha2
[0] = '9';
2219 user_alpha2
[1] = '7';
2222 * If we're ignoring user settings, we still need to
2223 * check the module parameter to ensure we put things
2224 * back as they were for a full restore.
2226 if (!is_world_regdom(ieee80211_regdom
)) {
2227 REG_DBG_PRINT("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
2228 ieee80211_regdom
[0], ieee80211_regdom
[1]);
2229 alpha2
[0] = ieee80211_regdom
[0];
2230 alpha2
[1] = ieee80211_regdom
[1];
2233 REG_DBG_PRINT("Restoring regulatory settings while preserving user preference for: %c%c\n",
2234 user_alpha2
[0], user_alpha2
[1]);
2235 alpha2
[0] = user_alpha2
[0];
2236 alpha2
[1] = user_alpha2
[1];
2238 } else if (!is_world_regdom(ieee80211_regdom
)) {
2239 REG_DBG_PRINT("Keeping preference on module parameter ieee80211_regdom: %c%c\n",
2240 ieee80211_regdom
[0], ieee80211_regdom
[1]);
2241 alpha2
[0] = ieee80211_regdom
[0];
2242 alpha2
[1] = ieee80211_regdom
[1];
2244 REG_DBG_PRINT("Restoring regulatory settings\n");
2247 static void restore_custom_reg_settings(struct wiphy
*wiphy
)
2249 struct ieee80211_supported_band
*sband
;
2250 enum ieee80211_band band
;
2251 struct ieee80211_channel
*chan
;
2254 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
2255 sband
= wiphy
->bands
[band
];
2258 for (i
= 0; i
< sband
->n_channels
; i
++) {
2259 chan
= &sband
->channels
[i
];
2260 chan
->flags
= chan
->orig_flags
;
2261 chan
->max_antenna_gain
= chan
->orig_mag
;
2262 chan
->max_power
= chan
->orig_mpwr
;
2263 chan
->beacon_found
= false;
2269 * Restoring regulatory settings involves ingoring any
2270 * possibly stale country IE information and user regulatory
2271 * settings if so desired, this includes any beacon hints
2272 * learned as we could have traveled outside to another country
2273 * after disconnection. To restore regulatory settings we do
2274 * exactly what we did at bootup:
2276 * - send a core regulatory hint
2277 * - send a user regulatory hint if applicable
2279 * Device drivers that send a regulatory hint for a specific country
2280 * keep their own regulatory domain on wiphy->regd so that does does
2281 * not need to be remembered.
2283 static void restore_regulatory_settings(bool reset_user
)
2286 char world_alpha2
[2];
2287 struct reg_beacon
*reg_beacon
, *btmp
;
2288 struct regulatory_request
*reg_request
, *tmp
;
2289 LIST_HEAD(tmp_reg_req_list
);
2290 struct cfg80211_registered_device
*rdev
;
2294 reg_is_indoor
= false;
2296 reset_regdomains(true, &world_regdom
);
2297 restore_alpha2(alpha2
, reset_user
);
2300 * If there's any pending requests we simply
2301 * stash them to a temporary pending queue and
2302 * add then after we've restored regulatory
2305 spin_lock(®_requests_lock
);
2306 list_for_each_entry_safe(reg_request
, tmp
, ®_requests_list
, list
) {
2307 if (reg_request
->initiator
!= NL80211_REGDOM_SET_BY_USER
)
2309 list_move_tail(®_request
->list
, &tmp_reg_req_list
);
2311 spin_unlock(®_requests_lock
);
2313 /* Clear beacon hints */
2314 spin_lock_bh(®_pending_beacons_lock
);
2315 list_for_each_entry_safe(reg_beacon
, btmp
, ®_pending_beacons
, list
) {
2316 list_del(®_beacon
->list
);
2319 spin_unlock_bh(®_pending_beacons_lock
);
2321 list_for_each_entry_safe(reg_beacon
, btmp
, ®_beacon_list
, list
) {
2322 list_del(®_beacon
->list
);
2326 /* First restore to the basic regulatory settings */
2327 world_alpha2
[0] = cfg80211_world_regdom
->alpha2
[0];
2328 world_alpha2
[1] = cfg80211_world_regdom
->alpha2
[1];
2330 list_for_each_entry(rdev
, &cfg80211_rdev_list
, list
) {
2331 if (rdev
->wiphy
.regulatory_flags
& REGULATORY_CUSTOM_REG
)
2332 restore_custom_reg_settings(&rdev
->wiphy
);
2335 regulatory_hint_core(world_alpha2
);
2338 * This restores the ieee80211_regdom module parameter
2339 * preference or the last user requested regulatory
2340 * settings, user regulatory settings takes precedence.
2342 if (is_an_alpha2(alpha2
))
2343 regulatory_hint_user(user_alpha2
, NL80211_USER_REG_HINT_USER
);
2345 spin_lock(®_requests_lock
);
2346 list_splice_tail_init(&tmp_reg_req_list
, ®_requests_list
);
2347 spin_unlock(®_requests_lock
);
2349 REG_DBG_PRINT("Kicking the queue\n");
2351 schedule_work(®_work
);
2354 void regulatory_hint_disconnect(void)
2356 REG_DBG_PRINT("All devices are disconnected, going to restore regulatory settings\n");
2357 restore_regulatory_settings(false);
2360 static bool freq_is_chan_12_13_14(u16 freq
)
2362 if (freq
== ieee80211_channel_to_frequency(12, IEEE80211_BAND_2GHZ
) ||
2363 freq
== ieee80211_channel_to_frequency(13, IEEE80211_BAND_2GHZ
) ||
2364 freq
== ieee80211_channel_to_frequency(14, IEEE80211_BAND_2GHZ
))
2369 static bool pending_reg_beacon(struct ieee80211_channel
*beacon_chan
)
2371 struct reg_beacon
*pending_beacon
;
2373 list_for_each_entry(pending_beacon
, ®_pending_beacons
, list
)
2374 if (beacon_chan
->center_freq
==
2375 pending_beacon
->chan
.center_freq
)
2380 int regulatory_hint_found_beacon(struct wiphy
*wiphy
,
2381 struct ieee80211_channel
*beacon_chan
,
2384 struct reg_beacon
*reg_beacon
;
2387 if (beacon_chan
->beacon_found
||
2388 beacon_chan
->flags
& IEEE80211_CHAN_RADAR
||
2389 (beacon_chan
->band
== IEEE80211_BAND_2GHZ
&&
2390 !freq_is_chan_12_13_14(beacon_chan
->center_freq
)))
2393 spin_lock_bh(®_pending_beacons_lock
);
2394 processing
= pending_reg_beacon(beacon_chan
);
2395 spin_unlock_bh(®_pending_beacons_lock
);
2400 reg_beacon
= kzalloc(sizeof(struct reg_beacon
), gfp
);
2404 REG_DBG_PRINT("Found new beacon on frequency: %d MHz (Ch %d) on %s\n",
2405 beacon_chan
->center_freq
,
2406 ieee80211_frequency_to_channel(beacon_chan
->center_freq
),
2409 memcpy(®_beacon
->chan
, beacon_chan
,
2410 sizeof(struct ieee80211_channel
));
2413 * Since we can be called from BH or and non-BH context
2414 * we must use spin_lock_bh()
2416 spin_lock_bh(®_pending_beacons_lock
);
2417 list_add_tail(®_beacon
->list
, ®_pending_beacons
);
2418 spin_unlock_bh(®_pending_beacons_lock
);
2420 schedule_work(®_work
);
2425 static void print_rd_rules(const struct ieee80211_regdomain
*rd
)
2428 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
2429 const struct ieee80211_freq_range
*freq_range
= NULL
;
2430 const struct ieee80211_power_rule
*power_rule
= NULL
;
2431 char bw
[32], cac_time
[32];
2433 pr_info(" (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp), (dfs_cac_time)\n");
2435 for (i
= 0; i
< rd
->n_reg_rules
; i
++) {
2436 reg_rule
= &rd
->reg_rules
[i
];
2437 freq_range
= ®_rule
->freq_range
;
2438 power_rule
= ®_rule
->power_rule
;
2440 if (reg_rule
->flags
& NL80211_RRF_AUTO_BW
)
2441 snprintf(bw
, sizeof(bw
), "%d KHz, %d KHz AUTO",
2442 freq_range
->max_bandwidth_khz
,
2443 reg_get_max_bandwidth(rd
, reg_rule
));
2445 snprintf(bw
, sizeof(bw
), "%d KHz",
2446 freq_range
->max_bandwidth_khz
);
2448 if (reg_rule
->flags
& NL80211_RRF_DFS
)
2449 scnprintf(cac_time
, sizeof(cac_time
), "%u s",
2450 reg_rule
->dfs_cac_ms
/1000);
2452 scnprintf(cac_time
, sizeof(cac_time
), "N/A");
2456 * There may not be documentation for max antenna gain
2457 * in certain regions
2459 if (power_rule
->max_antenna_gain
)
2460 pr_info(" (%d KHz - %d KHz @ %s), (%d mBi, %d mBm), (%s)\n",
2461 freq_range
->start_freq_khz
,
2462 freq_range
->end_freq_khz
,
2464 power_rule
->max_antenna_gain
,
2465 power_rule
->max_eirp
,
2468 pr_info(" (%d KHz - %d KHz @ %s), (N/A, %d mBm), (%s)\n",
2469 freq_range
->start_freq_khz
,
2470 freq_range
->end_freq_khz
,
2472 power_rule
->max_eirp
,
2477 bool reg_supported_dfs_region(enum nl80211_dfs_regions dfs_region
)
2479 switch (dfs_region
) {
2480 case NL80211_DFS_UNSET
:
2481 case NL80211_DFS_FCC
:
2482 case NL80211_DFS_ETSI
:
2483 case NL80211_DFS_JP
:
2486 REG_DBG_PRINT("Ignoring uknown DFS master region: %d\n",
2492 static void print_regdomain(const struct ieee80211_regdomain
*rd
)
2494 struct regulatory_request
*lr
= get_last_request();
2496 if (is_intersected_alpha2(rd
->alpha2
)) {
2497 if (lr
->initiator
== NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
2498 struct cfg80211_registered_device
*rdev
;
2499 rdev
= cfg80211_rdev_by_wiphy_idx(lr
->wiphy_idx
);
2501 pr_info("Current regulatory domain updated by AP to: %c%c\n",
2502 rdev
->country_ie_alpha2
[0],
2503 rdev
->country_ie_alpha2
[1]);
2505 pr_info("Current regulatory domain intersected:\n");
2507 pr_info("Current regulatory domain intersected:\n");
2508 } else if (is_world_regdom(rd
->alpha2
)) {
2509 pr_info("World regulatory domain updated:\n");
2511 if (is_unknown_alpha2(rd
->alpha2
))
2512 pr_info("Regulatory domain changed to driver built-in settings (unknown country)\n");
2514 if (reg_request_cell_base(lr
))
2515 pr_info("Regulatory domain changed to country: %c%c by Cell Station\n",
2516 rd
->alpha2
[0], rd
->alpha2
[1]);
2518 pr_info("Regulatory domain changed to country: %c%c\n",
2519 rd
->alpha2
[0], rd
->alpha2
[1]);
2523 pr_info(" DFS Master region: %s", reg_dfs_region_str(rd
->dfs_region
));
2527 static void print_regdomain_info(const struct ieee80211_regdomain
*rd
)
2529 pr_info("Regulatory domain: %c%c\n", rd
->alpha2
[0], rd
->alpha2
[1]);
2533 static int reg_set_rd_core(const struct ieee80211_regdomain
*rd
)
2535 if (!is_world_regdom(rd
->alpha2
))
2537 update_world_regdomain(rd
);
2541 static int reg_set_rd_user(const struct ieee80211_regdomain
*rd
,
2542 struct regulatory_request
*user_request
)
2544 const struct ieee80211_regdomain
*intersected_rd
= NULL
;
2546 if (!regdom_changes(rd
->alpha2
))
2549 if (!is_valid_rd(rd
)) {
2550 pr_err("Invalid regulatory domain detected:\n");
2551 print_regdomain_info(rd
);
2555 if (!user_request
->intersect
) {
2556 reset_regdomains(false, rd
);
2560 intersected_rd
= regdom_intersect(rd
, get_cfg80211_regdom());
2561 if (!intersected_rd
)
2566 reset_regdomains(false, intersected_rd
);
2571 static int reg_set_rd_driver(const struct ieee80211_regdomain
*rd
,
2572 struct regulatory_request
*driver_request
)
2574 const struct ieee80211_regdomain
*regd
;
2575 const struct ieee80211_regdomain
*intersected_rd
= NULL
;
2576 const struct ieee80211_regdomain
*tmp
;
2577 struct wiphy
*request_wiphy
;
2579 if (is_world_regdom(rd
->alpha2
))
2582 if (!regdom_changes(rd
->alpha2
))
2585 if (!is_valid_rd(rd
)) {
2586 pr_err("Invalid regulatory domain detected:\n");
2587 print_regdomain_info(rd
);
2591 request_wiphy
= wiphy_idx_to_wiphy(driver_request
->wiphy_idx
);
2592 if (!request_wiphy
) {
2593 queue_delayed_work(system_power_efficient_wq
,
2598 if (!driver_request
->intersect
) {
2599 if (request_wiphy
->regd
)
2602 regd
= reg_copy_regd(rd
);
2604 return PTR_ERR(regd
);
2606 rcu_assign_pointer(request_wiphy
->regd
, regd
);
2607 reset_regdomains(false, rd
);
2611 intersected_rd
= regdom_intersect(rd
, get_cfg80211_regdom());
2612 if (!intersected_rd
)
2616 * We can trash what CRDA provided now.
2617 * However if a driver requested this specific regulatory
2618 * domain we keep it for its private use
2620 tmp
= get_wiphy_regdom(request_wiphy
);
2621 rcu_assign_pointer(request_wiphy
->regd
, rd
);
2622 rcu_free_regdom(tmp
);
2626 reset_regdomains(false, intersected_rd
);
2631 static int reg_set_rd_country_ie(const struct ieee80211_regdomain
*rd
,
2632 struct regulatory_request
*country_ie_request
)
2634 struct wiphy
*request_wiphy
;
2636 if (!is_alpha2_set(rd
->alpha2
) && !is_an_alpha2(rd
->alpha2
) &&
2637 !is_unknown_alpha2(rd
->alpha2
))
2641 * Lets only bother proceeding on the same alpha2 if the current
2642 * rd is non static (it means CRDA was present and was used last)
2643 * and the pending request came in from a country IE
2646 if (!is_valid_rd(rd
)) {
2647 pr_err("Invalid regulatory domain detected:\n");
2648 print_regdomain_info(rd
);
2652 request_wiphy
= wiphy_idx_to_wiphy(country_ie_request
->wiphy_idx
);
2653 if (!request_wiphy
) {
2654 queue_delayed_work(system_power_efficient_wq
,
2659 if (country_ie_request
->intersect
)
2662 reset_regdomains(false, rd
);
2667 * Use this call to set the current regulatory domain. Conflicts with
2668 * multiple drivers can be ironed out later. Caller must've already
2669 * kmalloc'd the rd structure.
2671 int set_regdom(const struct ieee80211_regdomain
*rd
)
2673 struct regulatory_request
*lr
;
2674 bool user_reset
= false;
2677 if (!reg_is_valid_request(rd
->alpha2
)) {
2682 lr
= get_last_request();
2684 /* Note that this doesn't update the wiphys, this is done below */
2685 switch (lr
->initiator
) {
2686 case NL80211_REGDOM_SET_BY_CORE
:
2687 r
= reg_set_rd_core(rd
);
2689 case NL80211_REGDOM_SET_BY_USER
:
2690 r
= reg_set_rd_user(rd
, lr
);
2693 case NL80211_REGDOM_SET_BY_DRIVER
:
2694 r
= reg_set_rd_driver(rd
, lr
);
2696 case NL80211_REGDOM_SET_BY_COUNTRY_IE
:
2697 r
= reg_set_rd_country_ie(rd
, lr
);
2700 WARN(1, "invalid initiator %d\n", lr
->initiator
);
2707 reg_set_request_processed();
2710 /* Back to world regulatory in case of errors */
2711 restore_regulatory_settings(user_reset
);
2718 /* This would make this whole thing pointless */
2719 if (WARN_ON(!lr
->intersect
&& rd
!= get_cfg80211_regdom()))
2722 /* update all wiphys now with the new established regulatory domain */
2723 update_all_wiphy_regulatory(lr
->initiator
);
2725 print_regdomain(get_cfg80211_regdom());
2727 nl80211_send_reg_change_event(lr
);
2729 reg_set_request_processed();
2734 void wiphy_regulatory_register(struct wiphy
*wiphy
)
2736 struct regulatory_request
*lr
;
2738 if (!reg_dev_ignore_cell_hint(wiphy
))
2739 reg_num_devs_support_basehint
++;
2741 lr
= get_last_request();
2742 wiphy_update_regulatory(wiphy
, lr
->initiator
);
2745 void wiphy_regulatory_deregister(struct wiphy
*wiphy
)
2747 struct wiphy
*request_wiphy
= NULL
;
2748 struct regulatory_request
*lr
;
2750 lr
= get_last_request();
2752 if (!reg_dev_ignore_cell_hint(wiphy
))
2753 reg_num_devs_support_basehint
--;
2755 rcu_free_regdom(get_wiphy_regdom(wiphy
));
2756 RCU_INIT_POINTER(wiphy
->regd
, NULL
);
2759 request_wiphy
= wiphy_idx_to_wiphy(lr
->wiphy_idx
);
2761 if (!request_wiphy
|| request_wiphy
!= wiphy
)
2764 lr
->wiphy_idx
= WIPHY_IDX_INVALID
;
2765 lr
->country_ie_env
= ENVIRON_ANY
;
2768 static void reg_timeout_work(struct work_struct
*work
)
2770 REG_DBG_PRINT("Timeout while waiting for CRDA to reply, restoring regulatory settings\n");
2772 restore_regulatory_settings(true);
2777 * See http://www.fcc.gov/document/5-ghz-unlicensed-spectrum-unii, for
2778 * UNII band definitions
2780 int cfg80211_get_unii(int freq
)
2783 if (freq
>= 5150 && freq
<= 5250)
2787 if (freq
> 5250 && freq
<= 5350)
2791 if (freq
> 5350 && freq
<= 5470)
2795 if (freq
> 5470 && freq
<= 5725)
2799 if (freq
> 5725 && freq
<= 5825)
2805 bool regulatory_indoor_allowed(void)
2807 return reg_is_indoor
;
2810 int __init
regulatory_init(void)
2814 reg_pdev
= platform_device_register_simple("regulatory", 0, NULL
, 0);
2815 if (IS_ERR(reg_pdev
))
2816 return PTR_ERR(reg_pdev
);
2818 spin_lock_init(®_requests_lock
);
2819 spin_lock_init(®_pending_beacons_lock
);
2821 reg_regdb_size_check();
2823 rcu_assign_pointer(cfg80211_regdomain
, cfg80211_world_regdom
);
2825 user_alpha2
[0] = '9';
2826 user_alpha2
[1] = '7';
2828 /* We always try to get an update for the static regdomain */
2829 err
= regulatory_hint_core(cfg80211_world_regdom
->alpha2
);
2834 * N.B. kobject_uevent_env() can fail mainly for when we're out
2835 * memory which is handled and propagated appropriately above
2836 * but it can also fail during a netlink_broadcast() or during
2837 * early boot for call_usermodehelper(). For now treat these
2838 * errors as non-fatal.
2840 pr_err("kobject_uevent_env() was unable to call CRDA during init\n");
2844 * Finally, if the user set the module parameter treat it
2847 if (!is_world_regdom(ieee80211_regdom
))
2848 regulatory_hint_user(ieee80211_regdom
,
2849 NL80211_USER_REG_HINT_USER
);
2854 void regulatory_exit(void)
2856 struct regulatory_request
*reg_request
, *tmp
;
2857 struct reg_beacon
*reg_beacon
, *btmp
;
2859 cancel_work_sync(®_work
);
2860 cancel_delayed_work_sync(®_timeout
);
2862 /* Lock to suppress warnings */
2864 reset_regdomains(true, NULL
);
2867 dev_set_uevent_suppress(®_pdev
->dev
, true);
2869 platform_device_unregister(reg_pdev
);
2871 list_for_each_entry_safe(reg_beacon
, btmp
, ®_pending_beacons
, list
) {
2872 list_del(®_beacon
->list
);
2876 list_for_each_entry_safe(reg_beacon
, btmp
, ®_beacon_list
, list
) {
2877 list_del(®_beacon
->list
);
2881 list_for_each_entry_safe(reg_request
, tmp
, ®_requests_list
, list
) {
2882 list_del(®_request
->list
);