2 * Copyright 2002-2005, Instant802 Networks, Inc.
3 * Copyright 2005-2006, Devicescape Software, Inc.
4 * Copyright 2007 Johannes Berg <johannes@sipsolutions.net>
5 * Copyright 2008 Luis R. Rodriguez <lrodriguz@atheros.com>
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License version 2 as
9 * published by the Free Software Foundation.
13 * DOC: Wireless regulatory infrastructure
15 * The usual implementation is for a driver to read a device EEPROM to
16 * determine which regulatory domain it should be operating under, then
17 * looking up the allowable channels in a driver-local table and finally
18 * registering those channels in the wiphy structure.
20 * Another set of compliance enforcement is for drivers to use their
21 * own compliance limits which can be stored on the EEPROM. The host
22 * driver or firmware may ensure these are used.
24 * In addition to all this we provide an extra layer of regulatory
25 * conformance. For drivers which do not have any regulatory
26 * information CRDA provides the complete regulatory solution.
27 * For others it provides a community effort on further restrictions
28 * to enhance compliance.
30 * Note: When number of rules --> infinity we will not be able to
31 * index on alpha2 any more, instead we'll probably have to
32 * rely on some SHA1 checksum of the regdomain for example.
35 #include <linux/kernel.h>
36 #include <linux/list.h>
37 #include <linux/random.h>
38 #include <linux/nl80211.h>
39 #include <linux/platform_device.h>
40 #include <net/cfg80211.h>
46 #ifdef CONFIG_CFG80211_REG_DEBUG
47 #define REG_DBG_PRINT(format, args...) \
49 printk(KERN_DEBUG format , ## args); \
52 #define REG_DBG_PRINT(args...)
55 /* Receipt of information from last regulatory request */
56 static struct regulatory_request
*last_request
;
58 /* To trigger userspace events */
59 static struct platform_device
*reg_pdev
;
62 * Central wireless core regulatory domains, we only need two,
63 * the current one and a world regulatory domain in case we have no
64 * information to give us an alpha2
66 const struct ieee80211_regdomain
*cfg80211_regdomain
;
69 * We use this as a place for the rd structure built from the
70 * last parsed country IE to rest until CRDA gets back to us with
71 * what it thinks should apply for the same country
73 static const struct ieee80211_regdomain
*country_ie_regdomain
;
76 * Protects static reg.c components:
77 * - cfg80211_world_regdom
79 * - country_ie_regdomain
82 DEFINE_MUTEX(reg_mutex
);
83 #define assert_reg_lock() WARN_ON(!mutex_is_locked(®_mutex))
85 /* Used to queue up regulatory hints */
86 static LIST_HEAD(reg_requests_list
);
87 static spinlock_t reg_requests_lock
;
89 /* Used to queue up beacon hints for review */
90 static LIST_HEAD(reg_pending_beacons
);
91 static spinlock_t reg_pending_beacons_lock
;
93 /* Used to keep track of processed beacon hints */
94 static LIST_HEAD(reg_beacon_list
);
97 struct list_head list
;
98 struct ieee80211_channel chan
;
101 /* We keep a static world regulatory domain in case of the absence of CRDA */
102 static const struct ieee80211_regdomain world_regdom
= {
106 /* IEEE 802.11b/g, channels 1..11 */
107 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
108 /* IEEE 802.11b/g, channels 12..13. No HT40
109 * channel fits here. */
110 REG_RULE(2467-10, 2472+10, 20, 6, 20,
111 NL80211_RRF_PASSIVE_SCAN
|
112 NL80211_RRF_NO_IBSS
),
113 /* IEEE 802.11 channel 14 - Only JP enables
114 * this and for 802.11b only */
115 REG_RULE(2484-10, 2484+10, 20, 6, 20,
116 NL80211_RRF_PASSIVE_SCAN
|
117 NL80211_RRF_NO_IBSS
|
118 NL80211_RRF_NO_OFDM
),
119 /* IEEE 802.11a, channel 36..48 */
120 REG_RULE(5180-10, 5240+10, 40, 6, 20,
121 NL80211_RRF_PASSIVE_SCAN
|
122 NL80211_RRF_NO_IBSS
),
124 /* NB: 5260 MHz - 5700 MHz requies DFS */
126 /* IEEE 802.11a, channel 149..165 */
127 REG_RULE(5745-10, 5825+10, 40, 6, 20,
128 NL80211_RRF_PASSIVE_SCAN
|
129 NL80211_RRF_NO_IBSS
),
133 static const struct ieee80211_regdomain
*cfg80211_world_regdom
=
136 static char *ieee80211_regdom
= "00";
137 static char user_alpha2
[2];
139 module_param(ieee80211_regdom
, charp
, 0444);
140 MODULE_PARM_DESC(ieee80211_regdom
, "IEEE 802.11 regulatory domain code");
142 static void reset_regdomains(void)
144 /* avoid freeing static information or freeing something twice */
145 if (cfg80211_regdomain
== cfg80211_world_regdom
)
146 cfg80211_regdomain
= NULL
;
147 if (cfg80211_world_regdom
== &world_regdom
)
148 cfg80211_world_regdom
= NULL
;
149 if (cfg80211_regdomain
== &world_regdom
)
150 cfg80211_regdomain
= NULL
;
152 kfree(cfg80211_regdomain
);
153 kfree(cfg80211_world_regdom
);
155 cfg80211_world_regdom
= &world_regdom
;
156 cfg80211_regdomain
= NULL
;
160 * Dynamic world regulatory domain requested by the wireless
161 * core upon initialization
163 static void update_world_regdomain(const struct ieee80211_regdomain
*rd
)
165 BUG_ON(!last_request
);
169 cfg80211_world_regdom
= rd
;
170 cfg80211_regdomain
= rd
;
173 bool is_world_regdom(const char *alpha2
)
177 if (alpha2
[0] == '0' && alpha2
[1] == '0')
182 static bool is_alpha2_set(const char *alpha2
)
186 if (alpha2
[0] != 0 && alpha2
[1] != 0)
191 static bool is_alpha_upper(char letter
)
194 if (letter
>= 65 && letter
<= 90)
199 static bool is_unknown_alpha2(const char *alpha2
)
204 * Special case where regulatory domain was built by driver
205 * but a specific alpha2 cannot be determined
207 if (alpha2
[0] == '9' && alpha2
[1] == '9')
212 static bool is_intersected_alpha2(const char *alpha2
)
217 * Special case where regulatory domain is the
218 * result of an intersection between two regulatory domain
221 if (alpha2
[0] == '9' && alpha2
[1] == '8')
226 static bool is_an_alpha2(const char *alpha2
)
230 if (is_alpha_upper(alpha2
[0]) && is_alpha_upper(alpha2
[1]))
235 static bool alpha2_equal(const char *alpha2_x
, const char *alpha2_y
)
237 if (!alpha2_x
|| !alpha2_y
)
239 if (alpha2_x
[0] == alpha2_y
[0] &&
240 alpha2_x
[1] == alpha2_y
[1])
245 static bool regdom_changes(const char *alpha2
)
247 assert_cfg80211_lock();
249 if (!cfg80211_regdomain
)
251 if (alpha2_equal(cfg80211_regdomain
->alpha2
, alpha2
))
257 * The NL80211_REGDOM_SET_BY_USER regdom alpha2 is cached, this lets
258 * you know if a valid regulatory hint with NL80211_REGDOM_SET_BY_USER
259 * has ever been issued.
261 static bool is_user_regdom_saved(void)
263 if (user_alpha2
[0] == '9' && user_alpha2
[1] == '7')
266 /* This would indicate a mistake on the design */
267 if (WARN((!is_world_regdom(user_alpha2
) &&
268 !is_an_alpha2(user_alpha2
)),
269 "Unexpected user alpha2: %c%c\n",
278 * country_ie_integrity_changes - tells us if the country IE has changed
279 * @checksum: checksum of country IE of fields we are interested in
281 * If the country IE has not changed you can ignore it safely. This is
282 * useful to determine if two devices are seeing two different country IEs
283 * even on the same alpha2. Note that this will return false if no IE has
284 * been set on the wireless core yet.
286 static bool country_ie_integrity_changes(u32 checksum
)
288 /* If no IE has been set then the checksum doesn't change */
289 if (unlikely(!last_request
->country_ie_checksum
))
291 if (unlikely(last_request
->country_ie_checksum
!= checksum
))
296 static int reg_copy_regd(const struct ieee80211_regdomain
**dst_regd
,
297 const struct ieee80211_regdomain
*src_regd
)
299 struct ieee80211_regdomain
*regd
;
300 int size_of_regd
= 0;
303 size_of_regd
= sizeof(struct ieee80211_regdomain
) +
304 ((src_regd
->n_reg_rules
+ 1) * sizeof(struct ieee80211_reg_rule
));
306 regd
= kzalloc(size_of_regd
, GFP_KERNEL
);
310 memcpy(regd
, src_regd
, sizeof(struct ieee80211_regdomain
));
312 for (i
= 0; i
< src_regd
->n_reg_rules
; i
++)
313 memcpy(®d
->reg_rules
[i
], &src_regd
->reg_rules
[i
],
314 sizeof(struct ieee80211_reg_rule
));
320 #ifdef CONFIG_CFG80211_INTERNAL_REGDB
321 struct reg_regdb_search_request
{
323 struct list_head list
;
326 static LIST_HEAD(reg_regdb_search_list
);
327 static DEFINE_MUTEX(reg_regdb_search_mutex
);
329 static void reg_regdb_search(struct work_struct
*work
)
331 struct reg_regdb_search_request
*request
;
332 const struct ieee80211_regdomain
*curdom
, *regdom
;
335 mutex_lock(®_regdb_search_mutex
);
336 while (!list_empty(®_regdb_search_list
)) {
337 request
= list_first_entry(®_regdb_search_list
,
338 struct reg_regdb_search_request
,
340 list_del(&request
->list
);
342 for (i
=0; i
<reg_regdb_size
; i
++) {
343 curdom
= reg_regdb
[i
];
345 if (!memcmp(request
->alpha2
, curdom
->alpha2
, 2)) {
346 r
= reg_copy_regd(®dom
, curdom
);
349 mutex_lock(&cfg80211_mutex
);
351 mutex_unlock(&cfg80211_mutex
);
358 mutex_unlock(®_regdb_search_mutex
);
361 static DECLARE_WORK(reg_regdb_work
, reg_regdb_search
);
363 static void reg_regdb_query(const char *alpha2
)
365 struct reg_regdb_search_request
*request
;
370 request
= kzalloc(sizeof(struct reg_regdb_search_request
), GFP_KERNEL
);
374 memcpy(request
->alpha2
, alpha2
, 2);
376 mutex_lock(®_regdb_search_mutex
);
377 list_add_tail(&request
->list
, ®_regdb_search_list
);
378 mutex_unlock(®_regdb_search_mutex
);
380 schedule_work(®_regdb_work
);
383 static inline void reg_regdb_query(const char *alpha2
) {}
384 #endif /* CONFIG_CFG80211_INTERNAL_REGDB */
387 * This lets us keep regulatory code which is updated on a regulatory
388 * basis in userspace.
390 static int call_crda(const char *alpha2
)
392 char country_env
[9 + 2] = "COUNTRY=";
398 if (!is_world_regdom((char *) alpha2
))
399 printk(KERN_INFO
"cfg80211: Calling CRDA for country: %c%c\n",
400 alpha2
[0], alpha2
[1]);
402 printk(KERN_INFO
"cfg80211: Calling CRDA to update world "
403 "regulatory domain\n");
405 /* query internal regulatory database (if it exists) */
406 reg_regdb_query(alpha2
);
408 country_env
[8] = alpha2
[0];
409 country_env
[9] = alpha2
[1];
411 return kobject_uevent_env(®_pdev
->dev
.kobj
, KOBJ_CHANGE
, envp
);
414 /* Used by nl80211 before kmalloc'ing our regulatory domain */
415 bool reg_is_valid_request(const char *alpha2
)
417 assert_cfg80211_lock();
422 return alpha2_equal(last_request
->alpha2
, alpha2
);
425 /* Sanity check on a regulatory rule */
426 static bool is_valid_reg_rule(const struct ieee80211_reg_rule
*rule
)
428 const struct ieee80211_freq_range
*freq_range
= &rule
->freq_range
;
431 if (freq_range
->start_freq_khz
<= 0 || freq_range
->end_freq_khz
<= 0)
434 if (freq_range
->start_freq_khz
> freq_range
->end_freq_khz
)
437 freq_diff
= freq_range
->end_freq_khz
- freq_range
->start_freq_khz
;
439 if (freq_range
->end_freq_khz
<= freq_range
->start_freq_khz
||
440 freq_range
->max_bandwidth_khz
> freq_diff
)
446 static bool is_valid_rd(const struct ieee80211_regdomain
*rd
)
448 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
451 if (!rd
->n_reg_rules
)
454 if (WARN_ON(rd
->n_reg_rules
> NL80211_MAX_SUPP_REG_RULES
))
457 for (i
= 0; i
< rd
->n_reg_rules
; i
++) {
458 reg_rule
= &rd
->reg_rules
[i
];
459 if (!is_valid_reg_rule(reg_rule
))
466 static bool reg_does_bw_fit(const struct ieee80211_freq_range
*freq_range
,
470 u32 start_freq_khz
, end_freq_khz
;
472 start_freq_khz
= center_freq_khz
- (bw_khz
/2);
473 end_freq_khz
= center_freq_khz
+ (bw_khz
/2);
475 if (start_freq_khz
>= freq_range
->start_freq_khz
&&
476 end_freq_khz
<= freq_range
->end_freq_khz
)
483 * freq_in_rule_band - tells us if a frequency is in a frequency band
484 * @freq_range: frequency rule we want to query
485 * @freq_khz: frequency we are inquiring about
487 * This lets us know if a specific frequency rule is or is not relevant to
488 * a specific frequency's band. Bands are device specific and artificial
489 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
490 * safe for now to assume that a frequency rule should not be part of a
491 * frequency's band if the start freq or end freq are off by more than 2 GHz.
492 * This resolution can be lowered and should be considered as we add
493 * regulatory rule support for other "bands".
495 static bool freq_in_rule_band(const struct ieee80211_freq_range
*freq_range
,
498 #define ONE_GHZ_IN_KHZ 1000000
499 if (abs(freq_khz
- freq_range
->start_freq_khz
) <= (2 * ONE_GHZ_IN_KHZ
))
501 if (abs(freq_khz
- freq_range
->end_freq_khz
) <= (2 * ONE_GHZ_IN_KHZ
))
504 #undef ONE_GHZ_IN_KHZ
508 * This is a work around for sanity checking ieee80211_channel_to_frequency()'s
509 * work. ieee80211_channel_to_frequency() can for example currently provide a
510 * 2 GHz channel when in fact a 5 GHz channel was desired. An example would be
511 * an AP providing channel 8 on a country IE triplet when it sent this on the
512 * 5 GHz band, that channel is designed to be channel 8 on 5 GHz, not a 2 GHz
515 * This can be removed once ieee80211_channel_to_frequency() takes in a band.
517 static bool chan_in_band(int chan
, enum ieee80211_band band
)
519 int center_freq
= ieee80211_channel_to_frequency(chan
);
522 case IEEE80211_BAND_2GHZ
:
523 if (center_freq
<= 2484)
526 case IEEE80211_BAND_5GHZ
:
527 if (center_freq
>= 5005)
536 * Some APs may send a country IE triplet for each channel they
537 * support and while this is completely overkill and silly we still
538 * need to support it. We avoid making a single rule for each channel
539 * though and to help us with this we use this helper to find the
540 * actual subband end channel. These type of country IE triplet
541 * scenerios are handled then, all yielding two regulaotry rules from
542 * parsing a country IE:
580 * Returns 0 if the IE has been found to be invalid in the middle
583 static int max_subband_chan(enum ieee80211_band band
,
585 int orig_end_channel
,
590 u8
*triplets_start
= *country_ie
;
591 u8 len_at_triplet
= *country_ie_len
;
592 int end_subband_chan
= orig_end_channel
;
595 * We'll deal with padding for the caller unless
596 * its not immediate and we don't process any channels
598 if (*country_ie_len
== 1) {
600 *country_ie_len
-= 1;
601 return orig_end_channel
;
604 /* Move to the next triplet and then start search */
606 *country_ie_len
-= 3;
608 if (!chan_in_band(orig_cur_chan
, band
))
611 while (*country_ie_len
>= 3) {
613 struct ieee80211_country_ie_triplet
*triplet
=
614 (struct ieee80211_country_ie_triplet
*) *country_ie
;
615 int cur_channel
= 0, next_expected_chan
;
617 /* means last triplet is completely unrelated to this one */
618 if (triplet
->ext
.reg_extension_id
>=
619 IEEE80211_COUNTRY_EXTENSION_ID
) {
621 *country_ie_len
+= 3;
625 if (triplet
->chans
.first_channel
== 0) {
627 *country_ie_len
-= 1;
628 if (*country_ie_len
!= 0)
633 if (triplet
->chans
.num_channels
== 0)
636 /* Monitonically increasing channel order */
637 if (triplet
->chans
.first_channel
<= end_subband_chan
)
640 if (!chan_in_band(triplet
->chans
.first_channel
, band
))
644 if (triplet
->chans
.first_channel
<= 14) {
645 end_channel
= triplet
->chans
.first_channel
+
646 triplet
->chans
.num_channels
- 1;
649 end_channel
= triplet
->chans
.first_channel
+
650 (4 * (triplet
->chans
.num_channels
- 1));
653 if (!chan_in_band(end_channel
, band
))
656 if (orig_max_power
!= triplet
->chans
.max_power
) {
658 *country_ie_len
+= 3;
662 cur_channel
= triplet
->chans
.first_channel
;
664 /* The key is finding the right next expected channel */
665 if (band
== IEEE80211_BAND_2GHZ
)
666 next_expected_chan
= end_subband_chan
+ 1;
668 next_expected_chan
= end_subband_chan
+ 4;
670 if (cur_channel
!= next_expected_chan
) {
672 *country_ie_len
+= 3;
676 end_subband_chan
= end_channel
;
678 /* Move to the next one */
680 *country_ie_len
-= 3;
683 * Padding needs to be dealt with if we processed
686 if (*country_ie_len
== 1) {
688 *country_ie_len
-= 1;
692 /* If seen, the IE is invalid */
693 if (*country_ie_len
== 2)
697 if (end_subband_chan
== orig_end_channel
) {
698 *country_ie
= triplets_start
;
699 *country_ie_len
= len_at_triplet
;
700 return orig_end_channel
;
703 return end_subband_chan
;
707 * Converts a country IE to a regulatory domain. A regulatory domain
708 * structure has a lot of information which the IE doesn't yet have,
709 * so for the other values we use upper max values as we will intersect
710 * with our userspace regulatory agent to get lower bounds.
712 static struct ieee80211_regdomain
*country_ie_2_rd(
713 enum ieee80211_band band
,
718 struct ieee80211_regdomain
*rd
= NULL
;
722 u32 num_rules
= 0, size_of_regd
= 0;
723 u8
*triplets_start
= NULL
;
724 u8 len_at_triplet
= 0;
725 /* the last channel we have registered in a subband (triplet) */
726 int last_sub_max_channel
= 0;
728 *checksum
= 0xDEADBEEF;
730 /* Country IE requirements */
731 BUG_ON(country_ie_len
< IEEE80211_COUNTRY_IE_MIN_LEN
||
732 country_ie_len
& 0x01);
734 alpha2
[0] = country_ie
[0];
735 alpha2
[1] = country_ie
[1];
738 * Third octet can be:
742 * anything else we assume is no restrictions
744 if (country_ie
[2] == 'I')
745 flags
= NL80211_RRF_NO_OUTDOOR
;
746 else if (country_ie
[2] == 'O')
747 flags
= NL80211_RRF_NO_INDOOR
;
752 triplets_start
= country_ie
;
753 len_at_triplet
= country_ie_len
;
755 *checksum
^= ((flags
^ alpha2
[0] ^ alpha2
[1]) << 8);
758 * We need to build a reg rule for each triplet, but first we must
759 * calculate the number of reg rules we will need. We will need one
760 * for each channel subband
762 while (country_ie_len
>= 3) {
764 struct ieee80211_country_ie_triplet
*triplet
=
765 (struct ieee80211_country_ie_triplet
*) country_ie
;
766 int cur_sub_max_channel
= 0, cur_channel
= 0;
768 if (triplet
->ext
.reg_extension_id
>=
769 IEEE80211_COUNTRY_EXTENSION_ID
) {
776 * APs can add padding to make length divisible
777 * by two, required by the spec.
779 if (triplet
->chans
.first_channel
== 0) {
782 /* This is expected to be at the very end only */
783 if (country_ie_len
!= 0)
788 if (triplet
->chans
.num_channels
== 0)
791 if (!chan_in_band(triplet
->chans
.first_channel
, band
))
795 if (band
== IEEE80211_BAND_2GHZ
)
796 end_channel
= triplet
->chans
.first_channel
+
797 triplet
->chans
.num_channels
- 1;
800 * 5 GHz -- For example in country IEs if the first
801 * channel given is 36 and the number of channels is 4
802 * then the individual channel numbers defined for the
803 * 5 GHz PHY by these parameters are: 36, 40, 44, and 48
804 * and not 36, 37, 38, 39.
806 * See: http://tinyurl.com/11d-clarification
808 end_channel
= triplet
->chans
.first_channel
+
809 (4 * (triplet
->chans
.num_channels
- 1));
811 cur_channel
= triplet
->chans
.first_channel
;
814 * Enhancement for APs that send a triplet for every channel
815 * or for whatever reason sends triplets with multiple channels
816 * separated when in fact they should be together.
818 end_channel
= max_subband_chan(band
,
821 triplet
->chans
.max_power
,
827 if (!chan_in_band(end_channel
, band
))
830 cur_sub_max_channel
= end_channel
;
832 /* Basic sanity check */
833 if (cur_sub_max_channel
< cur_channel
)
837 * Do not allow overlapping channels. Also channels
838 * passed in each subband must be monotonically
841 if (last_sub_max_channel
) {
842 if (cur_channel
<= last_sub_max_channel
)
844 if (cur_sub_max_channel
<= last_sub_max_channel
)
849 * When dot11RegulatoryClassesRequired is supported
850 * we can throw ext triplets as part of this soup,
851 * for now we don't care when those change as we
854 *checksum
^= ((cur_channel
^ cur_sub_max_channel
) << 8) |
855 ((cur_sub_max_channel
^ cur_sub_max_channel
) << 16) |
856 ((triplet
->chans
.max_power
^ cur_sub_max_channel
) << 24);
858 last_sub_max_channel
= cur_sub_max_channel
;
862 if (country_ie_len
>= 3) {
868 * Note: this is not a IEEE requirement but
869 * simply a memory requirement
871 if (num_rules
> NL80211_MAX_SUPP_REG_RULES
)
875 country_ie
= triplets_start
;
876 country_ie_len
= len_at_triplet
;
878 size_of_regd
= sizeof(struct ieee80211_regdomain
) +
879 (num_rules
* sizeof(struct ieee80211_reg_rule
));
881 rd
= kzalloc(size_of_regd
, GFP_KERNEL
);
885 rd
->n_reg_rules
= num_rules
;
886 rd
->alpha2
[0] = alpha2
[0];
887 rd
->alpha2
[1] = alpha2
[1];
889 /* This time around we fill in the rd */
890 while (country_ie_len
>= 3) {
892 struct ieee80211_country_ie_triplet
*triplet
=
893 (struct ieee80211_country_ie_triplet
*) country_ie
;
894 struct ieee80211_reg_rule
*reg_rule
= NULL
;
895 struct ieee80211_freq_range
*freq_range
= NULL
;
896 struct ieee80211_power_rule
*power_rule
= NULL
;
899 * Must parse if dot11RegulatoryClassesRequired is true,
900 * we don't support this yet
902 if (triplet
->ext
.reg_extension_id
>=
903 IEEE80211_COUNTRY_EXTENSION_ID
) {
909 if (triplet
->chans
.first_channel
== 0) {
915 reg_rule
= &rd
->reg_rules
[i
];
916 freq_range
= ®_rule
->freq_range
;
917 power_rule
= ®_rule
->power_rule
;
919 reg_rule
->flags
= flags
;
922 if (band
== IEEE80211_BAND_2GHZ
)
923 end_channel
= triplet
->chans
.first_channel
+
924 triplet
->chans
.num_channels
-1;
926 end_channel
= triplet
->chans
.first_channel
+
927 (4 * (triplet
->chans
.num_channels
- 1));
929 end_channel
= max_subband_chan(band
,
930 triplet
->chans
.first_channel
,
932 triplet
->chans
.max_power
,
937 * The +10 is since the regulatory domain expects
938 * the actual band edge, not the center of freq for
939 * its start and end freqs, assuming 20 MHz bandwidth on
940 * the channels passed
942 freq_range
->start_freq_khz
=
943 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
944 triplet
->chans
.first_channel
) - 10);
945 freq_range
->end_freq_khz
=
946 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
950 * These are large arbitrary values we use to intersect later.
951 * Increment this if we ever support >= 40 MHz channels
954 freq_range
->max_bandwidth_khz
= MHZ_TO_KHZ(40);
955 power_rule
->max_antenna_gain
= DBI_TO_MBI(100);
956 power_rule
->max_eirp
= DBM_TO_MBM(triplet
->chans
.max_power
);
960 if (country_ie_len
>= 3) {
965 BUG_ON(i
> NL80211_MAX_SUPP_REG_RULES
);
973 * Helper for regdom_intersect(), this does the real
974 * mathematical intersection fun
976 static int reg_rules_intersect(
977 const struct ieee80211_reg_rule
*rule1
,
978 const struct ieee80211_reg_rule
*rule2
,
979 struct ieee80211_reg_rule
*intersected_rule
)
981 const struct ieee80211_freq_range
*freq_range1
, *freq_range2
;
982 struct ieee80211_freq_range
*freq_range
;
983 const struct ieee80211_power_rule
*power_rule1
, *power_rule2
;
984 struct ieee80211_power_rule
*power_rule
;
987 freq_range1
= &rule1
->freq_range
;
988 freq_range2
= &rule2
->freq_range
;
989 freq_range
= &intersected_rule
->freq_range
;
991 power_rule1
= &rule1
->power_rule
;
992 power_rule2
= &rule2
->power_rule
;
993 power_rule
= &intersected_rule
->power_rule
;
995 freq_range
->start_freq_khz
= max(freq_range1
->start_freq_khz
,
996 freq_range2
->start_freq_khz
);
997 freq_range
->end_freq_khz
= min(freq_range1
->end_freq_khz
,
998 freq_range2
->end_freq_khz
);
999 freq_range
->max_bandwidth_khz
= min(freq_range1
->max_bandwidth_khz
,
1000 freq_range2
->max_bandwidth_khz
);
1002 freq_diff
= freq_range
->end_freq_khz
- freq_range
->start_freq_khz
;
1003 if (freq_range
->max_bandwidth_khz
> freq_diff
)
1004 freq_range
->max_bandwidth_khz
= freq_diff
;
1006 power_rule
->max_eirp
= min(power_rule1
->max_eirp
,
1007 power_rule2
->max_eirp
);
1008 power_rule
->max_antenna_gain
= min(power_rule1
->max_antenna_gain
,
1009 power_rule2
->max_antenna_gain
);
1011 intersected_rule
->flags
= (rule1
->flags
| rule2
->flags
);
1013 if (!is_valid_reg_rule(intersected_rule
))
1020 * regdom_intersect - do the intersection between two regulatory domains
1021 * @rd1: first regulatory domain
1022 * @rd2: second regulatory domain
1024 * Use this function to get the intersection between two regulatory domains.
1025 * Once completed we will mark the alpha2 for the rd as intersected, "98",
1026 * as no one single alpha2 can represent this regulatory domain.
1028 * Returns a pointer to the regulatory domain structure which will hold the
1029 * resulting intersection of rules between rd1 and rd2. We will
1030 * kzalloc() this structure for you.
1032 static struct ieee80211_regdomain
*regdom_intersect(
1033 const struct ieee80211_regdomain
*rd1
,
1034 const struct ieee80211_regdomain
*rd2
)
1036 int r
, size_of_regd
;
1038 unsigned int num_rules
= 0, rule_idx
= 0;
1039 const struct ieee80211_reg_rule
*rule1
, *rule2
;
1040 struct ieee80211_reg_rule
*intersected_rule
;
1041 struct ieee80211_regdomain
*rd
;
1042 /* This is just a dummy holder to help us count */
1043 struct ieee80211_reg_rule irule
;
1045 /* Uses the stack temporarily for counter arithmetic */
1046 intersected_rule
= &irule
;
1048 memset(intersected_rule
, 0, sizeof(struct ieee80211_reg_rule
));
1054 * First we get a count of the rules we'll need, then we actually
1055 * build them. This is to so we can malloc() and free() a
1056 * regdomain once. The reason we use reg_rules_intersect() here
1057 * is it will return -EINVAL if the rule computed makes no sense.
1058 * All rules that do check out OK are valid.
1061 for (x
= 0; x
< rd1
->n_reg_rules
; x
++) {
1062 rule1
= &rd1
->reg_rules
[x
];
1063 for (y
= 0; y
< rd2
->n_reg_rules
; y
++) {
1064 rule2
= &rd2
->reg_rules
[y
];
1065 if (!reg_rules_intersect(rule1
, rule2
,
1068 memset(intersected_rule
, 0,
1069 sizeof(struct ieee80211_reg_rule
));
1076 size_of_regd
= sizeof(struct ieee80211_regdomain
) +
1077 ((num_rules
+ 1) * sizeof(struct ieee80211_reg_rule
));
1079 rd
= kzalloc(size_of_regd
, GFP_KERNEL
);
1083 for (x
= 0; x
< rd1
->n_reg_rules
; x
++) {
1084 rule1
= &rd1
->reg_rules
[x
];
1085 for (y
= 0; y
< rd2
->n_reg_rules
; y
++) {
1086 rule2
= &rd2
->reg_rules
[y
];
1088 * This time around instead of using the stack lets
1089 * write to the target rule directly saving ourselves
1092 intersected_rule
= &rd
->reg_rules
[rule_idx
];
1093 r
= reg_rules_intersect(rule1
, rule2
,
1096 * No need to memset here the intersected rule here as
1097 * we're not using the stack anymore
1105 if (rule_idx
!= num_rules
) {
1110 rd
->n_reg_rules
= num_rules
;
1111 rd
->alpha2
[0] = '9';
1112 rd
->alpha2
[1] = '8';
1118 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
1119 * want to just have the channel structure use these
1121 static u32
map_regdom_flags(u32 rd_flags
)
1123 u32 channel_flags
= 0;
1124 if (rd_flags
& NL80211_RRF_PASSIVE_SCAN
)
1125 channel_flags
|= IEEE80211_CHAN_PASSIVE_SCAN
;
1126 if (rd_flags
& NL80211_RRF_NO_IBSS
)
1127 channel_flags
|= IEEE80211_CHAN_NO_IBSS
;
1128 if (rd_flags
& NL80211_RRF_DFS
)
1129 channel_flags
|= IEEE80211_CHAN_RADAR
;
1130 return channel_flags
;
1133 static int freq_reg_info_regd(struct wiphy
*wiphy
,
1136 const struct ieee80211_reg_rule
**reg_rule
,
1137 const struct ieee80211_regdomain
*custom_regd
)
1140 bool band_rule_found
= false;
1141 const struct ieee80211_regdomain
*regd
;
1142 bool bw_fits
= false;
1144 if (!desired_bw_khz
)
1145 desired_bw_khz
= MHZ_TO_KHZ(20);
1147 regd
= custom_regd
? custom_regd
: cfg80211_regdomain
;
1150 * Follow the driver's regulatory domain, if present, unless a country
1151 * IE has been processed or a user wants to help complaince further
1153 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
1154 last_request
->initiator
!= NL80211_REGDOM_SET_BY_USER
&&
1161 for (i
= 0; i
< regd
->n_reg_rules
; i
++) {
1162 const struct ieee80211_reg_rule
*rr
;
1163 const struct ieee80211_freq_range
*fr
= NULL
;
1164 const struct ieee80211_power_rule
*pr
= NULL
;
1166 rr
= ®d
->reg_rules
[i
];
1167 fr
= &rr
->freq_range
;
1168 pr
= &rr
->power_rule
;
1171 * We only need to know if one frequency rule was
1172 * was in center_freq's band, that's enough, so lets
1173 * not overwrite it once found
1175 if (!band_rule_found
)
1176 band_rule_found
= freq_in_rule_band(fr
, center_freq
);
1178 bw_fits
= reg_does_bw_fit(fr
,
1182 if (band_rule_found
&& bw_fits
) {
1188 if (!band_rule_found
)
1193 EXPORT_SYMBOL(freq_reg_info
);
1195 int freq_reg_info(struct wiphy
*wiphy
,
1198 const struct ieee80211_reg_rule
**reg_rule
)
1200 assert_cfg80211_lock();
1201 return freq_reg_info_regd(wiphy
,
1209 * Note that right now we assume the desired channel bandwidth
1210 * is always 20 MHz for each individual channel (HT40 uses 20 MHz
1211 * per channel, the primary and the extension channel). To support
1212 * smaller custom bandwidths such as 5 MHz or 10 MHz we'll need a
1213 * new ieee80211_channel.target_bw and re run the regulatory check
1214 * on the wiphy with the target_bw specified. Then we can simply use
1215 * that below for the desired_bw_khz below.
1217 static void handle_channel(struct wiphy
*wiphy
, enum ieee80211_band band
,
1218 unsigned int chan_idx
)
1221 u32 flags
, bw_flags
= 0;
1222 u32 desired_bw_khz
= MHZ_TO_KHZ(20);
1223 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
1224 const struct ieee80211_power_rule
*power_rule
= NULL
;
1225 const struct ieee80211_freq_range
*freq_range
= NULL
;
1226 struct ieee80211_supported_band
*sband
;
1227 struct ieee80211_channel
*chan
;
1228 struct wiphy
*request_wiphy
= NULL
;
1230 assert_cfg80211_lock();
1232 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
1234 sband
= wiphy
->bands
[band
];
1235 BUG_ON(chan_idx
>= sband
->n_channels
);
1236 chan
= &sband
->channels
[chan_idx
];
1238 flags
= chan
->orig_flags
;
1240 r
= freq_reg_info(wiphy
,
1241 MHZ_TO_KHZ(chan
->center_freq
),
1247 * This means no regulatory rule was found in the country IE
1248 * with a frequency range on the center_freq's band, since
1249 * IEEE-802.11 allows for a country IE to have a subset of the
1250 * regulatory information provided in a country we ignore
1251 * disabling the channel unless at least one reg rule was
1252 * found on the center_freq's band. For details see this
1255 * http://tinyurl.com/11d-clarification
1258 last_request
->initiator
==
1259 NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
1260 REG_DBG_PRINT("cfg80211: Leaving channel %d MHz "
1261 "intact on %s - no rule found in band on "
1263 chan
->center_freq
, wiphy_name(wiphy
));
1266 * In this case we know the country IE has at least one reg rule
1267 * for the band so we respect its band definitions
1269 if (last_request
->initiator
==
1270 NL80211_REGDOM_SET_BY_COUNTRY_IE
)
1271 REG_DBG_PRINT("cfg80211: Disabling "
1272 "channel %d MHz on %s due to "
1274 chan
->center_freq
, wiphy_name(wiphy
));
1275 flags
|= IEEE80211_CHAN_DISABLED
;
1276 chan
->flags
= flags
;
1281 power_rule
= ®_rule
->power_rule
;
1282 freq_range
= ®_rule
->freq_range
;
1284 if (freq_range
->max_bandwidth_khz
< MHZ_TO_KHZ(40))
1285 bw_flags
= IEEE80211_CHAN_NO_HT40
;
1287 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
&&
1288 request_wiphy
&& request_wiphy
== wiphy
&&
1289 request_wiphy
->flags
& WIPHY_FLAG_STRICT_REGULATORY
) {
1291 * This gaurantees the driver's requested regulatory domain
1292 * will always be used as a base for further regulatory
1295 chan
->flags
= chan
->orig_flags
=
1296 map_regdom_flags(reg_rule
->flags
) | bw_flags
;
1297 chan
->max_antenna_gain
= chan
->orig_mag
=
1298 (int) MBI_TO_DBI(power_rule
->max_antenna_gain
);
1299 chan
->max_power
= chan
->orig_mpwr
=
1300 (int) MBM_TO_DBM(power_rule
->max_eirp
);
1304 chan
->flags
= flags
| bw_flags
| map_regdom_flags(reg_rule
->flags
);
1305 chan
->max_antenna_gain
= min(chan
->orig_mag
,
1306 (int) MBI_TO_DBI(power_rule
->max_antenna_gain
));
1307 if (chan
->orig_mpwr
)
1308 chan
->max_power
= min(chan
->orig_mpwr
,
1309 (int) MBM_TO_DBM(power_rule
->max_eirp
));
1311 chan
->max_power
= (int) MBM_TO_DBM(power_rule
->max_eirp
);
1314 static void handle_band(struct wiphy
*wiphy
, enum ieee80211_band band
)
1317 struct ieee80211_supported_band
*sband
;
1319 BUG_ON(!wiphy
->bands
[band
]);
1320 sband
= wiphy
->bands
[band
];
1322 for (i
= 0; i
< sband
->n_channels
; i
++)
1323 handle_channel(wiphy
, band
, i
);
1326 static bool ignore_reg_update(struct wiphy
*wiphy
,
1327 enum nl80211_reg_initiator initiator
)
1331 if (initiator
== NL80211_REGDOM_SET_BY_CORE
&&
1332 wiphy
->flags
& WIPHY_FLAG_CUSTOM_REGULATORY
)
1335 * wiphy->regd will be set once the device has its own
1336 * desired regulatory domain set
1338 if (wiphy
->flags
& WIPHY_FLAG_STRICT_REGULATORY
&& !wiphy
->regd
&&
1339 !is_world_regdom(last_request
->alpha2
))
1344 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator
)
1346 struct cfg80211_registered_device
*rdev
;
1348 list_for_each_entry(rdev
, &cfg80211_rdev_list
, list
)
1349 wiphy_update_regulatory(&rdev
->wiphy
, initiator
);
1352 static void handle_reg_beacon(struct wiphy
*wiphy
,
1353 unsigned int chan_idx
,
1354 struct reg_beacon
*reg_beacon
)
1356 struct ieee80211_supported_band
*sband
;
1357 struct ieee80211_channel
*chan
;
1358 bool channel_changed
= false;
1359 struct ieee80211_channel chan_before
;
1361 assert_cfg80211_lock();
1363 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
1364 chan
= &sband
->channels
[chan_idx
];
1366 if (likely(chan
->center_freq
!= reg_beacon
->chan
.center_freq
))
1369 if (chan
->beacon_found
)
1372 chan
->beacon_found
= true;
1374 if (wiphy
->flags
& WIPHY_FLAG_DISABLE_BEACON_HINTS
)
1377 chan_before
.center_freq
= chan
->center_freq
;
1378 chan_before
.flags
= chan
->flags
;
1380 if (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
) {
1381 chan
->flags
&= ~IEEE80211_CHAN_PASSIVE_SCAN
;
1382 channel_changed
= true;
1385 if (chan
->flags
& IEEE80211_CHAN_NO_IBSS
) {
1386 chan
->flags
&= ~IEEE80211_CHAN_NO_IBSS
;
1387 channel_changed
= true;
1390 if (channel_changed
)
1391 nl80211_send_beacon_hint_event(wiphy
, &chan_before
, chan
);
1395 * Called when a scan on a wiphy finds a beacon on
1398 static void wiphy_update_new_beacon(struct wiphy
*wiphy
,
1399 struct reg_beacon
*reg_beacon
)
1402 struct ieee80211_supported_band
*sband
;
1404 assert_cfg80211_lock();
1406 if (!wiphy
->bands
[reg_beacon
->chan
.band
])
1409 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
1411 for (i
= 0; i
< sband
->n_channels
; i
++)
1412 handle_reg_beacon(wiphy
, i
, reg_beacon
);
1416 * Called upon reg changes or a new wiphy is added
1418 static void wiphy_update_beacon_reg(struct wiphy
*wiphy
)
1421 struct ieee80211_supported_band
*sband
;
1422 struct reg_beacon
*reg_beacon
;
1424 assert_cfg80211_lock();
1426 if (list_empty(®_beacon_list
))
1429 list_for_each_entry(reg_beacon
, ®_beacon_list
, list
) {
1430 if (!wiphy
->bands
[reg_beacon
->chan
.band
])
1432 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
1433 for (i
= 0; i
< sband
->n_channels
; i
++)
1434 handle_reg_beacon(wiphy
, i
, reg_beacon
);
1438 static bool reg_is_world_roaming(struct wiphy
*wiphy
)
1440 if (is_world_regdom(cfg80211_regdomain
->alpha2
) ||
1441 (wiphy
->regd
&& is_world_regdom(wiphy
->regd
->alpha2
)))
1444 last_request
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
1445 wiphy
->flags
& WIPHY_FLAG_CUSTOM_REGULATORY
)
1450 /* Reap the advantages of previously found beacons */
1451 static void reg_process_beacons(struct wiphy
*wiphy
)
1454 * Means we are just firing up cfg80211, so no beacons would
1455 * have been processed yet.
1459 if (!reg_is_world_roaming(wiphy
))
1461 wiphy_update_beacon_reg(wiphy
);
1464 static bool is_ht40_not_allowed(struct ieee80211_channel
*chan
)
1468 if (chan
->flags
& IEEE80211_CHAN_DISABLED
)
1470 /* This would happen when regulatory rules disallow HT40 completely */
1471 if (IEEE80211_CHAN_NO_HT40
== (chan
->flags
& (IEEE80211_CHAN_NO_HT40
)))
1476 static void reg_process_ht_flags_channel(struct wiphy
*wiphy
,
1477 enum ieee80211_band band
,
1478 unsigned int chan_idx
)
1480 struct ieee80211_supported_band
*sband
;
1481 struct ieee80211_channel
*channel
;
1482 struct ieee80211_channel
*channel_before
= NULL
, *channel_after
= NULL
;
1485 assert_cfg80211_lock();
1487 sband
= wiphy
->bands
[band
];
1488 BUG_ON(chan_idx
>= sband
->n_channels
);
1489 channel
= &sband
->channels
[chan_idx
];
1491 if (is_ht40_not_allowed(channel
)) {
1492 channel
->flags
|= IEEE80211_CHAN_NO_HT40
;
1497 * We need to ensure the extension channels exist to
1498 * be able to use HT40- or HT40+, this finds them (or not)
1500 for (i
= 0; i
< sband
->n_channels
; i
++) {
1501 struct ieee80211_channel
*c
= &sband
->channels
[i
];
1502 if (c
->center_freq
== (channel
->center_freq
- 20))
1504 if (c
->center_freq
== (channel
->center_freq
+ 20))
1509 * Please note that this assumes target bandwidth is 20 MHz,
1510 * if that ever changes we also need to change the below logic
1511 * to include that as well.
1513 if (is_ht40_not_allowed(channel_before
))
1514 channel
->flags
|= IEEE80211_CHAN_NO_HT40MINUS
;
1516 channel
->flags
&= ~IEEE80211_CHAN_NO_HT40MINUS
;
1518 if (is_ht40_not_allowed(channel_after
))
1519 channel
->flags
|= IEEE80211_CHAN_NO_HT40PLUS
;
1521 channel
->flags
&= ~IEEE80211_CHAN_NO_HT40PLUS
;
1524 static void reg_process_ht_flags_band(struct wiphy
*wiphy
,
1525 enum ieee80211_band band
)
1528 struct ieee80211_supported_band
*sband
;
1530 BUG_ON(!wiphy
->bands
[band
]);
1531 sband
= wiphy
->bands
[band
];
1533 for (i
= 0; i
< sband
->n_channels
; i
++)
1534 reg_process_ht_flags_channel(wiphy
, band
, i
);
1537 static void reg_process_ht_flags(struct wiphy
*wiphy
)
1539 enum ieee80211_band band
;
1544 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
1545 if (wiphy
->bands
[band
])
1546 reg_process_ht_flags_band(wiphy
, band
);
1551 void wiphy_update_regulatory(struct wiphy
*wiphy
,
1552 enum nl80211_reg_initiator initiator
)
1554 enum ieee80211_band band
;
1556 if (ignore_reg_update(wiphy
, initiator
))
1558 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
1559 if (wiphy
->bands
[band
])
1560 handle_band(wiphy
, band
);
1563 reg_process_beacons(wiphy
);
1564 reg_process_ht_flags(wiphy
);
1565 if (wiphy
->reg_notifier
)
1566 wiphy
->reg_notifier(wiphy
, last_request
);
1569 static void handle_channel_custom(struct wiphy
*wiphy
,
1570 enum ieee80211_band band
,
1571 unsigned int chan_idx
,
1572 const struct ieee80211_regdomain
*regd
)
1575 u32 desired_bw_khz
= MHZ_TO_KHZ(20);
1577 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
1578 const struct ieee80211_power_rule
*power_rule
= NULL
;
1579 const struct ieee80211_freq_range
*freq_range
= NULL
;
1580 struct ieee80211_supported_band
*sband
;
1581 struct ieee80211_channel
*chan
;
1585 sband
= wiphy
->bands
[band
];
1586 BUG_ON(chan_idx
>= sband
->n_channels
);
1587 chan
= &sband
->channels
[chan_idx
];
1589 r
= freq_reg_info_regd(wiphy
,
1590 MHZ_TO_KHZ(chan
->center_freq
),
1596 chan
->flags
= IEEE80211_CHAN_DISABLED
;
1600 power_rule
= ®_rule
->power_rule
;
1601 freq_range
= ®_rule
->freq_range
;
1603 if (freq_range
->max_bandwidth_khz
< MHZ_TO_KHZ(40))
1604 bw_flags
= IEEE80211_CHAN_NO_HT40
;
1606 chan
->flags
|= map_regdom_flags(reg_rule
->flags
) | bw_flags
;
1607 chan
->max_antenna_gain
= (int) MBI_TO_DBI(power_rule
->max_antenna_gain
);
1608 chan
->max_power
= (int) MBM_TO_DBM(power_rule
->max_eirp
);
1611 static void handle_band_custom(struct wiphy
*wiphy
, enum ieee80211_band band
,
1612 const struct ieee80211_regdomain
*regd
)
1615 struct ieee80211_supported_band
*sband
;
1617 BUG_ON(!wiphy
->bands
[band
]);
1618 sband
= wiphy
->bands
[band
];
1620 for (i
= 0; i
< sband
->n_channels
; i
++)
1621 handle_channel_custom(wiphy
, band
, i
, regd
);
1624 /* Used by drivers prior to wiphy registration */
1625 void wiphy_apply_custom_regulatory(struct wiphy
*wiphy
,
1626 const struct ieee80211_regdomain
*regd
)
1628 enum ieee80211_band band
;
1629 unsigned int bands_set
= 0;
1631 mutex_lock(®_mutex
);
1632 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
1633 if (!wiphy
->bands
[band
])
1635 handle_band_custom(wiphy
, band
, regd
);
1638 mutex_unlock(®_mutex
);
1641 * no point in calling this if it won't have any effect
1642 * on your device's supportd bands.
1644 WARN_ON(!bands_set
);
1646 EXPORT_SYMBOL(wiphy_apply_custom_regulatory
);
1649 * Return value which can be used by ignore_request() to indicate
1650 * it has been determined we should intersect two regulatory domains
1652 #define REG_INTERSECT 1
1654 /* This has the logic which determines when a new request
1655 * should be ignored. */
1656 static int ignore_request(struct wiphy
*wiphy
,
1657 struct regulatory_request
*pending_request
)
1659 struct wiphy
*last_wiphy
= NULL
;
1661 assert_cfg80211_lock();
1663 /* All initial requests are respected */
1667 switch (pending_request
->initiator
) {
1668 case NL80211_REGDOM_SET_BY_CORE
:
1670 case NL80211_REGDOM_SET_BY_COUNTRY_IE
:
1672 last_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
1674 if (unlikely(!is_an_alpha2(pending_request
->alpha2
)))
1676 if (last_request
->initiator
==
1677 NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
1678 if (last_wiphy
!= wiphy
) {
1680 * Two cards with two APs claiming different
1681 * Country IE alpha2s. We could
1682 * intersect them, but that seems unlikely
1683 * to be correct. Reject second one for now.
1685 if (regdom_changes(pending_request
->alpha2
))
1690 * Two consecutive Country IE hints on the same wiphy.
1691 * This should be picked up early by the driver/stack
1693 if (WARN_ON(regdom_changes(pending_request
->alpha2
)))
1697 return REG_INTERSECT
;
1698 case NL80211_REGDOM_SET_BY_DRIVER
:
1699 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_CORE
) {
1700 if (regdom_changes(pending_request
->alpha2
))
1706 * This would happen if you unplug and plug your card
1707 * back in or if you add a new device for which the previously
1708 * loaded card also agrees on the regulatory domain.
1710 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
&&
1711 !regdom_changes(pending_request
->alpha2
))
1714 return REG_INTERSECT
;
1715 case NL80211_REGDOM_SET_BY_USER
:
1716 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_COUNTRY_IE
)
1717 return REG_INTERSECT
;
1719 * If the user knows better the user should set the regdom
1720 * to their country before the IE is picked up
1722 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_USER
&&
1723 last_request
->intersect
)
1726 * Process user requests only after previous user/driver/core
1727 * requests have been processed
1729 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_CORE
||
1730 last_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
||
1731 last_request
->initiator
== NL80211_REGDOM_SET_BY_USER
) {
1732 if (regdom_changes(last_request
->alpha2
))
1736 if (!regdom_changes(pending_request
->alpha2
))
1746 * __regulatory_hint - hint to the wireless core a regulatory domain
1747 * @wiphy: if the hint comes from country information from an AP, this
1748 * is required to be set to the wiphy that received the information
1749 * @pending_request: the regulatory request currently being processed
1751 * The Wireless subsystem can use this function to hint to the wireless core
1752 * what it believes should be the current regulatory domain.
1754 * Returns zero if all went fine, %-EALREADY if a regulatory domain had
1755 * already been set or other standard error codes.
1757 * Caller must hold &cfg80211_mutex and ®_mutex
1759 static int __regulatory_hint(struct wiphy
*wiphy
,
1760 struct regulatory_request
*pending_request
)
1762 bool intersect
= false;
1765 assert_cfg80211_lock();
1767 r
= ignore_request(wiphy
, pending_request
);
1769 if (r
== REG_INTERSECT
) {
1770 if (pending_request
->initiator
==
1771 NL80211_REGDOM_SET_BY_DRIVER
) {
1772 r
= reg_copy_regd(&wiphy
->regd
, cfg80211_regdomain
);
1774 kfree(pending_request
);
1781 * If the regulatory domain being requested by the
1782 * driver has already been set just copy it to the
1785 if (r
== -EALREADY
&&
1786 pending_request
->initiator
==
1787 NL80211_REGDOM_SET_BY_DRIVER
) {
1788 r
= reg_copy_regd(&wiphy
->regd
, cfg80211_regdomain
);
1790 kfree(pending_request
);
1796 kfree(pending_request
);
1801 kfree(last_request
);
1803 last_request
= pending_request
;
1804 last_request
->intersect
= intersect
;
1806 pending_request
= NULL
;
1808 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_USER
) {
1809 user_alpha2
[0] = last_request
->alpha2
[0];
1810 user_alpha2
[1] = last_request
->alpha2
[1];
1813 /* When r == REG_INTERSECT we do need to call CRDA */
1816 * Since CRDA will not be called in this case as we already
1817 * have applied the requested regulatory domain before we just
1818 * inform userspace we have processed the request
1821 nl80211_send_reg_change_event(last_request
);
1825 return call_crda(last_request
->alpha2
);
1828 /* This processes *all* regulatory hints */
1829 static void reg_process_hint(struct regulatory_request
*reg_request
)
1832 struct wiphy
*wiphy
= NULL
;
1834 BUG_ON(!reg_request
->alpha2
);
1836 mutex_lock(&cfg80211_mutex
);
1837 mutex_lock(®_mutex
);
1839 if (wiphy_idx_valid(reg_request
->wiphy_idx
))
1840 wiphy
= wiphy_idx_to_wiphy(reg_request
->wiphy_idx
);
1842 if (reg_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
&&
1848 r
= __regulatory_hint(wiphy
, reg_request
);
1849 /* This is required so that the orig_* parameters are saved */
1850 if (r
== -EALREADY
&& wiphy
&&
1851 wiphy
->flags
& WIPHY_FLAG_STRICT_REGULATORY
)
1852 wiphy_update_regulatory(wiphy
, reg_request
->initiator
);
1854 mutex_unlock(®_mutex
);
1855 mutex_unlock(&cfg80211_mutex
);
1858 /* Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* */
1859 static void reg_process_pending_hints(void)
1861 struct regulatory_request
*reg_request
;
1863 spin_lock(®_requests_lock
);
1864 while (!list_empty(®_requests_list
)) {
1865 reg_request
= list_first_entry(®_requests_list
,
1866 struct regulatory_request
,
1868 list_del_init(®_request
->list
);
1870 spin_unlock(®_requests_lock
);
1871 reg_process_hint(reg_request
);
1872 spin_lock(®_requests_lock
);
1874 spin_unlock(®_requests_lock
);
1877 /* Processes beacon hints -- this has nothing to do with country IEs */
1878 static void reg_process_pending_beacon_hints(void)
1880 struct cfg80211_registered_device
*rdev
;
1881 struct reg_beacon
*pending_beacon
, *tmp
;
1884 * No need to hold the reg_mutex here as we just touch wiphys
1885 * and do not read or access regulatory variables.
1887 mutex_lock(&cfg80211_mutex
);
1889 /* This goes through the _pending_ beacon list */
1890 spin_lock_bh(®_pending_beacons_lock
);
1892 if (list_empty(®_pending_beacons
)) {
1893 spin_unlock_bh(®_pending_beacons_lock
);
1897 list_for_each_entry_safe(pending_beacon
, tmp
,
1898 ®_pending_beacons
, list
) {
1900 list_del_init(&pending_beacon
->list
);
1902 /* Applies the beacon hint to current wiphys */
1903 list_for_each_entry(rdev
, &cfg80211_rdev_list
, list
)
1904 wiphy_update_new_beacon(&rdev
->wiphy
, pending_beacon
);
1906 /* Remembers the beacon hint for new wiphys or reg changes */
1907 list_add_tail(&pending_beacon
->list
, ®_beacon_list
);
1910 spin_unlock_bh(®_pending_beacons_lock
);
1912 mutex_unlock(&cfg80211_mutex
);
1915 static void reg_todo(struct work_struct
*work
)
1917 reg_process_pending_hints();
1918 reg_process_pending_beacon_hints();
1921 static DECLARE_WORK(reg_work
, reg_todo
);
1923 static void queue_regulatory_request(struct regulatory_request
*request
)
1925 spin_lock(®_requests_lock
);
1926 list_add_tail(&request
->list
, ®_requests_list
);
1927 spin_unlock(®_requests_lock
);
1929 schedule_work(®_work
);
1933 * Core regulatory hint -- happens during cfg80211_init()
1934 * and when we restore regulatory settings.
1936 static int regulatory_hint_core(const char *alpha2
)
1938 struct regulatory_request
*request
;
1940 kfree(last_request
);
1941 last_request
= NULL
;
1943 request
= kzalloc(sizeof(struct regulatory_request
),
1948 request
->alpha2
[0] = alpha2
[0];
1949 request
->alpha2
[1] = alpha2
[1];
1950 request
->initiator
= NL80211_REGDOM_SET_BY_CORE
;
1953 * This ensures last_request is populated once modules
1954 * come swinging in and calling regulatory hints and
1955 * wiphy_apply_custom_regulatory().
1957 reg_process_hint(request
);
1963 int regulatory_hint_user(const char *alpha2
)
1965 struct regulatory_request
*request
;
1969 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
1973 request
->wiphy_idx
= WIPHY_IDX_STALE
;
1974 request
->alpha2
[0] = alpha2
[0];
1975 request
->alpha2
[1] = alpha2
[1];
1976 request
->initiator
= NL80211_REGDOM_SET_BY_USER
;
1978 queue_regulatory_request(request
);
1984 int regulatory_hint(struct wiphy
*wiphy
, const char *alpha2
)
1986 struct regulatory_request
*request
;
1991 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
1995 request
->wiphy_idx
= get_wiphy_idx(wiphy
);
1997 /* Must have registered wiphy first */
1998 BUG_ON(!wiphy_idx_valid(request
->wiphy_idx
));
2000 request
->alpha2
[0] = alpha2
[0];
2001 request
->alpha2
[1] = alpha2
[1];
2002 request
->initiator
= NL80211_REGDOM_SET_BY_DRIVER
;
2004 queue_regulatory_request(request
);
2008 EXPORT_SYMBOL(regulatory_hint
);
2010 /* Caller must hold reg_mutex */
2011 static bool reg_same_country_ie_hint(struct wiphy
*wiphy
,
2012 u32 country_ie_checksum
)
2014 struct wiphy
*request_wiphy
;
2018 if (unlikely(last_request
->initiator
!=
2019 NL80211_REGDOM_SET_BY_COUNTRY_IE
))
2022 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
2027 if (likely(request_wiphy
!= wiphy
))
2028 return !country_ie_integrity_changes(country_ie_checksum
);
2030 * We should not have let these through at this point, they
2031 * should have been picked up earlier by the first alpha2 check
2034 if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum
)))
2040 * We hold wdev_lock() here so we cannot hold cfg80211_mutex() and
2041 * therefore cannot iterate over the rdev list here.
2043 void regulatory_hint_11d(struct wiphy
*wiphy
,
2044 enum ieee80211_band band
,
2048 struct ieee80211_regdomain
*rd
= NULL
;
2051 enum environment_cap env
= ENVIRON_ANY
;
2052 struct regulatory_request
*request
;
2054 mutex_lock(®_mutex
);
2056 if (unlikely(!last_request
))
2059 /* IE len must be evenly divisible by 2 */
2060 if (country_ie_len
& 0x01)
2063 if (country_ie_len
< IEEE80211_COUNTRY_IE_MIN_LEN
)
2067 * Pending country IE processing, this can happen after we
2068 * call CRDA and wait for a response if a beacon was received before
2069 * we were able to process the last regulatory_hint_11d() call
2071 if (country_ie_regdomain
)
2074 alpha2
[0] = country_ie
[0];
2075 alpha2
[1] = country_ie
[1];
2077 if (country_ie
[2] == 'I')
2078 env
= ENVIRON_INDOOR
;
2079 else if (country_ie
[2] == 'O')
2080 env
= ENVIRON_OUTDOOR
;
2083 * We will run this only upon a successful connection on cfg80211.
2084 * We leave conflict resolution to the workqueue, where can hold
2087 if (likely(last_request
->initiator
==
2088 NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
2089 wiphy_idx_valid(last_request
->wiphy_idx
)))
2092 rd
= country_ie_2_rd(band
, country_ie
, country_ie_len
, &checksum
);
2094 REG_DBG_PRINT("cfg80211: Ignoring bogus country IE\n");
2099 * This will not happen right now but we leave it here for the
2100 * the future when we want to add suspend/resume support and having
2101 * the user move to another country after doing so, or having the user
2102 * move to another AP. Right now we just trust the first AP.
2104 * If we hit this before we add this support we want to be informed of
2105 * it as it would indicate a mistake in the current design
2107 if (WARN_ON(reg_same_country_ie_hint(wiphy
, checksum
)))
2110 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
2115 * We keep this around for when CRDA comes back with a response so
2116 * we can intersect with that
2118 country_ie_regdomain
= rd
;
2120 request
->wiphy_idx
= get_wiphy_idx(wiphy
);
2121 request
->alpha2
[0] = rd
->alpha2
[0];
2122 request
->alpha2
[1] = rd
->alpha2
[1];
2123 request
->initiator
= NL80211_REGDOM_SET_BY_COUNTRY_IE
;
2124 request
->country_ie_checksum
= checksum
;
2125 request
->country_ie_env
= env
;
2127 mutex_unlock(®_mutex
);
2129 queue_regulatory_request(request
);
2136 mutex_unlock(®_mutex
);
2139 static void restore_alpha2(char *alpha2
, bool reset_user
)
2141 /* indicates there is no alpha2 to consider for restoration */
2145 /* The user setting has precedence over the module parameter */
2146 if (is_user_regdom_saved()) {
2147 /* Unless we're asked to ignore it and reset it */
2149 REG_DBG_PRINT("cfg80211: Restoring regulatory settings "
2150 "including user preference\n");
2151 user_alpha2
[0] = '9';
2152 user_alpha2
[1] = '7';
2155 * If we're ignoring user settings, we still need to
2156 * check the module parameter to ensure we put things
2157 * back as they were for a full restore.
2159 if (!is_world_regdom(ieee80211_regdom
)) {
2160 REG_DBG_PRINT("cfg80211: Keeping preference on "
2161 "module parameter ieee80211_regdom: %c%c\n",
2162 ieee80211_regdom
[0],
2163 ieee80211_regdom
[1]);
2164 alpha2
[0] = ieee80211_regdom
[0];
2165 alpha2
[1] = ieee80211_regdom
[1];
2168 REG_DBG_PRINT("cfg80211: Restoring regulatory settings "
2169 "while preserving user preference for: %c%c\n",
2172 alpha2
[0] = user_alpha2
[0];
2173 alpha2
[1] = user_alpha2
[1];
2175 } else if (!is_world_regdom(ieee80211_regdom
)) {
2176 REG_DBG_PRINT("cfg80211: Keeping preference on "
2177 "module parameter ieee80211_regdom: %c%c\n",
2178 ieee80211_regdom
[0],
2179 ieee80211_regdom
[1]);
2180 alpha2
[0] = ieee80211_regdom
[0];
2181 alpha2
[1] = ieee80211_regdom
[1];
2183 REG_DBG_PRINT("cfg80211: Restoring regulatory settings\n");
2187 * Restoring regulatory settings involves ingoring any
2188 * possibly stale country IE information and user regulatory
2189 * settings if so desired, this includes any beacon hints
2190 * learned as we could have traveled outside to another country
2191 * after disconnection. To restore regulatory settings we do
2192 * exactly what we did at bootup:
2194 * - send a core regulatory hint
2195 * - send a user regulatory hint if applicable
2197 * Device drivers that send a regulatory hint for a specific country
2198 * keep their own regulatory domain on wiphy->regd so that does does
2199 * not need to be remembered.
2201 static void restore_regulatory_settings(bool reset_user
)
2204 struct reg_beacon
*reg_beacon
, *btmp
;
2206 mutex_lock(&cfg80211_mutex
);
2207 mutex_lock(®_mutex
);
2210 restore_alpha2(alpha2
, reset_user
);
2212 /* Clear beacon hints */
2213 spin_lock_bh(®_pending_beacons_lock
);
2214 if (!list_empty(®_pending_beacons
)) {
2215 list_for_each_entry_safe(reg_beacon
, btmp
,
2216 ®_pending_beacons
, list
) {
2217 list_del(®_beacon
->list
);
2221 spin_unlock_bh(®_pending_beacons_lock
);
2223 if (!list_empty(®_beacon_list
)) {
2224 list_for_each_entry_safe(reg_beacon
, btmp
,
2225 ®_beacon_list
, list
) {
2226 list_del(®_beacon
->list
);
2231 /* First restore to the basic regulatory settings */
2232 cfg80211_regdomain
= cfg80211_world_regdom
;
2234 mutex_unlock(®_mutex
);
2235 mutex_unlock(&cfg80211_mutex
);
2237 regulatory_hint_core(cfg80211_regdomain
->alpha2
);
2240 * This restores the ieee80211_regdom module parameter
2241 * preference or the last user requested regulatory
2242 * settings, user regulatory settings takes precedence.
2244 if (is_an_alpha2(alpha2
))
2245 regulatory_hint_user(user_alpha2
);
2249 void regulatory_hint_disconnect(void)
2251 REG_DBG_PRINT("cfg80211: All devices are disconnected, going to "
2252 "restore regulatory settings\n");
2253 restore_regulatory_settings(false);
2256 static bool freq_is_chan_12_13_14(u16 freq
)
2258 if (freq
== ieee80211_channel_to_frequency(12) ||
2259 freq
== ieee80211_channel_to_frequency(13) ||
2260 freq
== ieee80211_channel_to_frequency(14))
2265 int regulatory_hint_found_beacon(struct wiphy
*wiphy
,
2266 struct ieee80211_channel
*beacon_chan
,
2269 struct reg_beacon
*reg_beacon
;
2271 if (likely((beacon_chan
->beacon_found
||
2272 (beacon_chan
->flags
& IEEE80211_CHAN_RADAR
) ||
2273 (beacon_chan
->band
== IEEE80211_BAND_2GHZ
&&
2274 !freq_is_chan_12_13_14(beacon_chan
->center_freq
)))))
2277 reg_beacon
= kzalloc(sizeof(struct reg_beacon
), gfp
);
2281 REG_DBG_PRINT("cfg80211: Found new beacon on "
2282 "frequency: %d MHz (Ch %d) on %s\n",
2283 beacon_chan
->center_freq
,
2284 ieee80211_frequency_to_channel(beacon_chan
->center_freq
),
2287 memcpy(®_beacon
->chan
, beacon_chan
,
2288 sizeof(struct ieee80211_channel
));
2292 * Since we can be called from BH or and non-BH context
2293 * we must use spin_lock_bh()
2295 spin_lock_bh(®_pending_beacons_lock
);
2296 list_add_tail(®_beacon
->list
, ®_pending_beacons
);
2297 spin_unlock_bh(®_pending_beacons_lock
);
2299 schedule_work(®_work
);
2304 static void print_rd_rules(const struct ieee80211_regdomain
*rd
)
2307 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
2308 const struct ieee80211_freq_range
*freq_range
= NULL
;
2309 const struct ieee80211_power_rule
*power_rule
= NULL
;
2311 printk(KERN_INFO
" (start_freq - end_freq @ bandwidth), "
2312 "(max_antenna_gain, max_eirp)\n");
2314 for (i
= 0; i
< rd
->n_reg_rules
; i
++) {
2315 reg_rule
= &rd
->reg_rules
[i
];
2316 freq_range
= ®_rule
->freq_range
;
2317 power_rule
= ®_rule
->power_rule
;
2320 * There may not be documentation for max antenna gain
2321 * in certain regions
2323 if (power_rule
->max_antenna_gain
)
2324 printk(KERN_INFO
" (%d KHz - %d KHz @ %d KHz), "
2325 "(%d mBi, %d mBm)\n",
2326 freq_range
->start_freq_khz
,
2327 freq_range
->end_freq_khz
,
2328 freq_range
->max_bandwidth_khz
,
2329 power_rule
->max_antenna_gain
,
2330 power_rule
->max_eirp
);
2332 printk(KERN_INFO
" (%d KHz - %d KHz @ %d KHz), "
2334 freq_range
->start_freq_khz
,
2335 freq_range
->end_freq_khz
,
2336 freq_range
->max_bandwidth_khz
,
2337 power_rule
->max_eirp
);
2341 static void print_regdomain(const struct ieee80211_regdomain
*rd
)
2344 if (is_intersected_alpha2(rd
->alpha2
)) {
2346 if (last_request
->initiator
==
2347 NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
2348 struct cfg80211_registered_device
*rdev
;
2349 rdev
= cfg80211_rdev_by_wiphy_idx(
2350 last_request
->wiphy_idx
);
2352 printk(KERN_INFO
"cfg80211: Current regulatory "
2353 "domain updated by AP to: %c%c\n",
2354 rdev
->country_ie_alpha2
[0],
2355 rdev
->country_ie_alpha2
[1]);
2357 printk(KERN_INFO
"cfg80211: Current regulatory "
2358 "domain intersected: \n");
2360 printk(KERN_INFO
"cfg80211: Current regulatory "
2361 "domain intersected: \n");
2362 } else if (is_world_regdom(rd
->alpha2
))
2363 printk(KERN_INFO
"cfg80211: World regulatory "
2364 "domain updated:\n");
2366 if (is_unknown_alpha2(rd
->alpha2
))
2367 printk(KERN_INFO
"cfg80211: Regulatory domain "
2368 "changed to driver built-in settings "
2369 "(unknown country)\n");
2371 printk(KERN_INFO
"cfg80211: Regulatory domain "
2372 "changed to country: %c%c\n",
2373 rd
->alpha2
[0], rd
->alpha2
[1]);
2378 static void print_regdomain_info(const struct ieee80211_regdomain
*rd
)
2380 printk(KERN_INFO
"cfg80211: Regulatory domain: %c%c\n",
2381 rd
->alpha2
[0], rd
->alpha2
[1]);
2385 #ifdef CONFIG_CFG80211_REG_DEBUG
2386 static void reg_country_ie_process_debug(
2387 const struct ieee80211_regdomain
*rd
,
2388 const struct ieee80211_regdomain
*country_ie_regdomain
,
2389 const struct ieee80211_regdomain
*intersected_rd
)
2391 printk(KERN_DEBUG
"cfg80211: Received country IE:\n");
2392 print_regdomain_info(country_ie_regdomain
);
2393 printk(KERN_DEBUG
"cfg80211: CRDA thinks this should applied:\n");
2394 print_regdomain_info(rd
);
2395 if (intersected_rd
) {
2396 printk(KERN_DEBUG
"cfg80211: We intersect both of these "
2398 print_regdomain_info(intersected_rd
);
2401 printk(KERN_DEBUG
"cfg80211: Intersection between both failed\n");
2404 static inline void reg_country_ie_process_debug(
2405 const struct ieee80211_regdomain
*rd
,
2406 const struct ieee80211_regdomain
*country_ie_regdomain
,
2407 const struct ieee80211_regdomain
*intersected_rd
)
2412 /* Takes ownership of rd only if it doesn't fail */
2413 static int __set_regdom(const struct ieee80211_regdomain
*rd
)
2415 const struct ieee80211_regdomain
*intersected_rd
= NULL
;
2416 struct cfg80211_registered_device
*rdev
= NULL
;
2417 struct wiphy
*request_wiphy
;
2418 /* Some basic sanity checks first */
2420 if (is_world_regdom(rd
->alpha2
)) {
2421 if (WARN_ON(!reg_is_valid_request(rd
->alpha2
)))
2423 update_world_regdomain(rd
);
2427 if (!is_alpha2_set(rd
->alpha2
) && !is_an_alpha2(rd
->alpha2
) &&
2428 !is_unknown_alpha2(rd
->alpha2
))
2435 * Lets only bother proceeding on the same alpha2 if the current
2436 * rd is non static (it means CRDA was present and was used last)
2437 * and the pending request came in from a country IE
2439 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
2441 * If someone else asked us to change the rd lets only bother
2442 * checking if the alpha2 changes if CRDA was already called
2444 if (!regdom_changes(rd
->alpha2
))
2449 * Now lets set the regulatory domain, update all driver channels
2450 * and finally inform them of what we have done, in case they want
2451 * to review or adjust their own settings based on their own
2452 * internal EEPROM data
2455 if (WARN_ON(!reg_is_valid_request(rd
->alpha2
)))
2458 if (!is_valid_rd(rd
)) {
2459 printk(KERN_ERR
"cfg80211: Invalid "
2460 "regulatory domain detected:\n");
2461 print_regdomain_info(rd
);
2465 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
2467 if (!last_request
->intersect
) {
2470 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_DRIVER
) {
2472 cfg80211_regdomain
= rd
;
2477 * For a driver hint, lets copy the regulatory domain the
2478 * driver wanted to the wiphy to deal with conflicts
2482 * Userspace could have sent two replies with only
2483 * one kernel request.
2485 if (request_wiphy
->regd
)
2488 r
= reg_copy_regd(&request_wiphy
->regd
, rd
);
2493 cfg80211_regdomain
= rd
;
2497 /* Intersection requires a bit more work */
2499 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
2501 intersected_rd
= regdom_intersect(rd
, cfg80211_regdomain
);
2502 if (!intersected_rd
)
2506 * We can trash what CRDA provided now.
2507 * However if a driver requested this specific regulatory
2508 * domain we keep it for its private use
2510 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
)
2511 request_wiphy
->regd
= rd
;
2518 cfg80211_regdomain
= intersected_rd
;
2524 * Country IE requests are handled a bit differently, we intersect
2525 * the country IE rd with what CRDA believes that country should have
2529 * Userspace could have sent two replies with only
2530 * one kernel request. By the second reply we would have
2531 * already processed and consumed the country_ie_regdomain.
2533 if (!country_ie_regdomain
)
2535 BUG_ON(rd
== country_ie_regdomain
);
2538 * Intersect what CRDA returned and our what we
2539 * had built from the Country IE received
2542 intersected_rd
= regdom_intersect(rd
, country_ie_regdomain
);
2544 reg_country_ie_process_debug(rd
,
2545 country_ie_regdomain
,
2548 kfree(country_ie_regdomain
);
2549 country_ie_regdomain
= NULL
;
2551 if (!intersected_rd
)
2554 rdev
= wiphy_to_dev(request_wiphy
);
2556 rdev
->country_ie_alpha2
[0] = rd
->alpha2
[0];
2557 rdev
->country_ie_alpha2
[1] = rd
->alpha2
[1];
2558 rdev
->env
= last_request
->country_ie_env
;
2560 BUG_ON(intersected_rd
== rd
);
2566 cfg80211_regdomain
= intersected_rd
;
2573 * Use this call to set the current regulatory domain. Conflicts with
2574 * multiple drivers can be ironed out later. Caller must've already
2575 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
2577 int set_regdom(const struct ieee80211_regdomain
*rd
)
2581 assert_cfg80211_lock();
2583 mutex_lock(®_mutex
);
2585 /* Note that this doesn't update the wiphys, this is done below */
2586 r
= __set_regdom(rd
);
2589 mutex_unlock(®_mutex
);
2593 /* This would make this whole thing pointless */
2594 if (!last_request
->intersect
)
2595 BUG_ON(rd
!= cfg80211_regdomain
);
2597 /* update all wiphys now with the new established regulatory domain */
2598 update_all_wiphy_regulatory(last_request
->initiator
);
2600 print_regdomain(cfg80211_regdomain
);
2602 nl80211_send_reg_change_event(last_request
);
2604 mutex_unlock(®_mutex
);
2609 /* Caller must hold cfg80211_mutex */
2610 void reg_device_remove(struct wiphy
*wiphy
)
2612 struct wiphy
*request_wiphy
= NULL
;
2614 assert_cfg80211_lock();
2616 mutex_lock(®_mutex
);
2621 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
2623 if (!request_wiphy
|| request_wiphy
!= wiphy
)
2626 last_request
->wiphy_idx
= WIPHY_IDX_STALE
;
2627 last_request
->country_ie_env
= ENVIRON_ANY
;
2629 mutex_unlock(®_mutex
);
2632 int regulatory_init(void)
2636 reg_pdev
= platform_device_register_simple("regulatory", 0, NULL
, 0);
2637 if (IS_ERR(reg_pdev
))
2638 return PTR_ERR(reg_pdev
);
2640 spin_lock_init(®_requests_lock
);
2641 spin_lock_init(®_pending_beacons_lock
);
2643 cfg80211_regdomain
= cfg80211_world_regdom
;
2645 user_alpha2
[0] = '9';
2646 user_alpha2
[1] = '7';
2648 /* We always try to get an update for the static regdomain */
2649 err
= regulatory_hint_core(cfg80211_regdomain
->alpha2
);
2654 * N.B. kobject_uevent_env() can fail mainly for when we're out
2655 * memory which is handled and propagated appropriately above
2656 * but it can also fail during a netlink_broadcast() or during
2657 * early boot for call_usermodehelper(). For now treat these
2658 * errors as non-fatal.
2660 printk(KERN_ERR
"cfg80211: kobject_uevent_env() was unable "
2661 "to call CRDA during init");
2662 #ifdef CONFIG_CFG80211_REG_DEBUG
2663 /* We want to find out exactly why when debugging */
2669 * Finally, if the user set the module parameter treat it
2672 if (!is_world_regdom(ieee80211_regdom
))
2673 regulatory_hint_user(ieee80211_regdom
);
2678 void regulatory_exit(void)
2680 struct regulatory_request
*reg_request
, *tmp
;
2681 struct reg_beacon
*reg_beacon
, *btmp
;
2683 cancel_work_sync(®_work
);
2685 mutex_lock(&cfg80211_mutex
);
2686 mutex_lock(®_mutex
);
2690 kfree(country_ie_regdomain
);
2691 country_ie_regdomain
= NULL
;
2693 kfree(last_request
);
2695 platform_device_unregister(reg_pdev
);
2697 spin_lock_bh(®_pending_beacons_lock
);
2698 if (!list_empty(®_pending_beacons
)) {
2699 list_for_each_entry_safe(reg_beacon
, btmp
,
2700 ®_pending_beacons
, list
) {
2701 list_del(®_beacon
->list
);
2705 spin_unlock_bh(®_pending_beacons_lock
);
2707 if (!list_empty(®_beacon_list
)) {
2708 list_for_each_entry_safe(reg_beacon
, btmp
,
2709 ®_beacon_list
, list
) {
2710 list_del(®_beacon
->list
);
2715 spin_lock(®_requests_lock
);
2716 if (!list_empty(®_requests_list
)) {
2717 list_for_each_entry_safe(reg_request
, tmp
,
2718 ®_requests_list
, list
) {
2719 list_del(®_request
->list
);
2723 spin_unlock(®_requests_lock
);
2725 mutex_unlock(®_mutex
);
2726 mutex_unlock(&cfg80211_mutex
);