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/wireless.h>
41 #include <net/cfg80211.h>
45 /* Receipt of information from last regulatory request */
46 static struct regulatory_request
*last_request
;
48 /* To trigger userspace events */
49 static struct platform_device
*reg_pdev
;
51 /* Keep the ordering from large to small */
52 static u32 supported_bandwidths
[] = {
58 * Central wireless core regulatory domains, we only need two,
59 * the current one and a world regulatory domain in case we have no
60 * information to give us an alpha2
62 const struct ieee80211_regdomain
*cfg80211_regdomain
;
65 * We use this as a place for the rd structure built from the
66 * last parsed country IE to rest until CRDA gets back to us with
67 * what it thinks should apply for the same country
69 static const struct ieee80211_regdomain
*country_ie_regdomain
;
71 /* Used to queue up regulatory hints */
72 static LIST_HEAD(reg_requests_list
);
73 static spinlock_t reg_requests_lock
;
75 /* Used to queue up beacon hints for review */
76 static LIST_HEAD(reg_pending_beacons
);
77 static spinlock_t reg_pending_beacons_lock
;
79 /* Used to keep track of processed beacon hints */
80 static LIST_HEAD(reg_beacon_list
);
83 struct list_head list
;
84 struct ieee80211_channel chan
;
87 /* We keep a static world regulatory domain in case of the absence of CRDA */
88 static const struct ieee80211_regdomain world_regdom
= {
92 /* IEEE 802.11b/g, channels 1..11 */
93 REG_RULE(2412-10, 2462+10, 40, 6, 20, 0),
94 /* IEEE 802.11a, channel 36..48 */
95 REG_RULE(5180-10, 5240+10, 40, 6, 23,
96 NL80211_RRF_PASSIVE_SCAN
|
99 /* NB: 5260 MHz - 5700 MHz requies DFS */
101 /* IEEE 802.11a, channel 149..165 */
102 REG_RULE(5745-10, 5825+10, 40, 6, 23,
103 NL80211_RRF_PASSIVE_SCAN
|
104 NL80211_RRF_NO_IBSS
),
108 static const struct ieee80211_regdomain
*cfg80211_world_regdom
=
111 #ifdef CONFIG_WIRELESS_OLD_REGULATORY
112 static char *ieee80211_regdom
= "US";
113 module_param(ieee80211_regdom
, charp
, 0444);
114 MODULE_PARM_DESC(ieee80211_regdom
, "IEEE 802.11 regulatory domain code");
117 * We assume 40 MHz bandwidth for the old regulatory work.
118 * We make emphasis we are using the exact same frequencies
122 static const struct ieee80211_regdomain us_regdom
= {
126 /* IEEE 802.11b/g, channels 1..11 */
127 REG_RULE(2412-10, 2462+10, 40, 6, 27, 0),
128 /* IEEE 802.11a, channel 36 */
129 REG_RULE(5180-10, 5180+10, 40, 6, 23, 0),
130 /* IEEE 802.11a, channel 40 */
131 REG_RULE(5200-10, 5200+10, 40, 6, 23, 0),
132 /* IEEE 802.11a, channel 44 */
133 REG_RULE(5220-10, 5220+10, 40, 6, 23, 0),
134 /* IEEE 802.11a, channels 48..64 */
135 REG_RULE(5240-10, 5320+10, 40, 6, 23, 0),
136 /* IEEE 802.11a, channels 149..165, outdoor */
137 REG_RULE(5745-10, 5825+10, 40, 6, 30, 0),
141 static const struct ieee80211_regdomain jp_regdom
= {
145 /* IEEE 802.11b/g, channels 1..14 */
146 REG_RULE(2412-10, 2484+10, 40, 6, 20, 0),
147 /* IEEE 802.11a, channels 34..48 */
148 REG_RULE(5170-10, 5240+10, 40, 6, 20,
149 NL80211_RRF_PASSIVE_SCAN
),
150 /* IEEE 802.11a, channels 52..64 */
151 REG_RULE(5260-10, 5320+10, 40, 6, 20,
152 NL80211_RRF_NO_IBSS
|
157 static const struct ieee80211_regdomain eu_regdom
= {
160 * This alpha2 is bogus, we leave it here just for stupid
161 * backward compatibility
165 /* IEEE 802.11b/g, channels 1..13 */
166 REG_RULE(2412-10, 2472+10, 40, 6, 20, 0),
167 /* IEEE 802.11a, channel 36 */
168 REG_RULE(5180-10, 5180+10, 40, 6, 23,
169 NL80211_RRF_PASSIVE_SCAN
),
170 /* IEEE 802.11a, channel 40 */
171 REG_RULE(5200-10, 5200+10, 40, 6, 23,
172 NL80211_RRF_PASSIVE_SCAN
),
173 /* IEEE 802.11a, channel 44 */
174 REG_RULE(5220-10, 5220+10, 40, 6, 23,
175 NL80211_RRF_PASSIVE_SCAN
),
176 /* IEEE 802.11a, channels 48..64 */
177 REG_RULE(5240-10, 5320+10, 40, 6, 20,
178 NL80211_RRF_NO_IBSS
|
180 /* IEEE 802.11a, channels 100..140 */
181 REG_RULE(5500-10, 5700+10, 40, 6, 30,
182 NL80211_RRF_NO_IBSS
|
187 static const struct ieee80211_regdomain
*static_regdom(char *alpha2
)
189 if (alpha2
[0] == 'U' && alpha2
[1] == 'S')
191 if (alpha2
[0] == 'J' && alpha2
[1] == 'P')
193 if (alpha2
[0] == 'E' && alpha2
[1] == 'U')
195 /* Default, as per the old rules */
199 static bool is_old_static_regdom(const struct ieee80211_regdomain
*rd
)
201 if (rd
== &us_regdom
|| rd
== &jp_regdom
|| rd
== &eu_regdom
)
206 static inline bool is_old_static_regdom(const struct ieee80211_regdomain
*rd
)
212 static void reset_regdomains(void)
214 /* avoid freeing static information or freeing something twice */
215 if (cfg80211_regdomain
== cfg80211_world_regdom
)
216 cfg80211_regdomain
= NULL
;
217 if (cfg80211_world_regdom
== &world_regdom
)
218 cfg80211_world_regdom
= NULL
;
219 if (cfg80211_regdomain
== &world_regdom
)
220 cfg80211_regdomain
= NULL
;
221 if (is_old_static_regdom(cfg80211_regdomain
))
222 cfg80211_regdomain
= NULL
;
224 kfree(cfg80211_regdomain
);
225 kfree(cfg80211_world_regdom
);
227 cfg80211_world_regdom
= &world_regdom
;
228 cfg80211_regdomain
= NULL
;
232 * Dynamic world regulatory domain requested by the wireless
233 * core upon initialization
235 static void update_world_regdomain(const struct ieee80211_regdomain
*rd
)
237 BUG_ON(!last_request
);
241 cfg80211_world_regdom
= rd
;
242 cfg80211_regdomain
= rd
;
245 bool is_world_regdom(const char *alpha2
)
249 if (alpha2
[0] == '0' && alpha2
[1] == '0')
254 static bool is_alpha2_set(const char *alpha2
)
258 if (alpha2
[0] != 0 && alpha2
[1] != 0)
263 static bool is_alpha_upper(char letter
)
266 if (letter
>= 65 && letter
<= 90)
271 static bool is_unknown_alpha2(const char *alpha2
)
276 * Special case where regulatory domain was built by driver
277 * but a specific alpha2 cannot be determined
279 if (alpha2
[0] == '9' && alpha2
[1] == '9')
284 static bool is_intersected_alpha2(const char *alpha2
)
289 * Special case where regulatory domain is the
290 * result of an intersection between two regulatory domain
293 if (alpha2
[0] == '9' && alpha2
[1] == '8')
298 static bool is_an_alpha2(const char *alpha2
)
302 if (is_alpha_upper(alpha2
[0]) && is_alpha_upper(alpha2
[1]))
307 static bool alpha2_equal(const char *alpha2_x
, const char *alpha2_y
)
309 if (!alpha2_x
|| !alpha2_y
)
311 if (alpha2_x
[0] == alpha2_y
[0] &&
312 alpha2_x
[1] == alpha2_y
[1])
317 static bool regdom_changes(const char *alpha2
)
319 assert_cfg80211_lock();
321 if (!cfg80211_regdomain
)
323 if (alpha2_equal(cfg80211_regdomain
->alpha2
, alpha2
))
329 * country_ie_integrity_changes - tells us if the country IE has changed
330 * @checksum: checksum of country IE of fields we are interested in
332 * If the country IE has not changed you can ignore it safely. This is
333 * useful to determine if two devices are seeing two different country IEs
334 * even on the same alpha2. Note that this will return false if no IE has
335 * been set on the wireless core yet.
337 static bool country_ie_integrity_changes(u32 checksum
)
339 /* If no IE has been set then the checksum doesn't change */
340 if (unlikely(!last_request
->country_ie_checksum
))
342 if (unlikely(last_request
->country_ie_checksum
!= checksum
))
348 * This lets us keep regulatory code which is updated on a regulatory
349 * basis in userspace.
351 static int call_crda(const char *alpha2
)
353 char country_env
[9 + 2] = "COUNTRY=";
359 if (!is_world_regdom((char *) alpha2
))
360 printk(KERN_INFO
"cfg80211: Calling CRDA for country: %c%c\n",
361 alpha2
[0], alpha2
[1]);
363 printk(KERN_INFO
"cfg80211: Calling CRDA to update world "
364 "regulatory domain\n");
366 country_env
[8] = alpha2
[0];
367 country_env
[9] = alpha2
[1];
369 return kobject_uevent_env(®_pdev
->dev
.kobj
, KOBJ_CHANGE
, envp
);
372 /* Used by nl80211 before kmalloc'ing our regulatory domain */
373 bool reg_is_valid_request(const char *alpha2
)
378 return alpha2_equal(last_request
->alpha2
, alpha2
);
381 /* Sanity check on a regulatory rule */
382 static bool is_valid_reg_rule(const struct ieee80211_reg_rule
*rule
)
384 const struct ieee80211_freq_range
*freq_range
= &rule
->freq_range
;
387 if (freq_range
->start_freq_khz
<= 0 || freq_range
->end_freq_khz
<= 0)
390 if (freq_range
->start_freq_khz
> freq_range
->end_freq_khz
)
393 freq_diff
= freq_range
->end_freq_khz
- freq_range
->start_freq_khz
;
395 if (freq_diff
<= 0 || freq_range
->max_bandwidth_khz
> freq_diff
)
401 static bool is_valid_rd(const struct ieee80211_regdomain
*rd
)
403 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
406 if (!rd
->n_reg_rules
)
409 if (WARN_ON(rd
->n_reg_rules
> NL80211_MAX_SUPP_REG_RULES
))
412 for (i
= 0; i
< rd
->n_reg_rules
; i
++) {
413 reg_rule
= &rd
->reg_rules
[i
];
414 if (!is_valid_reg_rule(reg_rule
))
421 /* Returns value in KHz */
422 static u32
freq_max_bandwidth(const struct ieee80211_freq_range
*freq_range
,
426 for (i
= 0; i
< ARRAY_SIZE(supported_bandwidths
); i
++) {
427 u32 start_freq_khz
= freq
- supported_bandwidths
[i
]/2;
428 u32 end_freq_khz
= freq
+ supported_bandwidths
[i
]/2;
429 if (start_freq_khz
>= freq_range
->start_freq_khz
&&
430 end_freq_khz
<= freq_range
->end_freq_khz
)
431 return supported_bandwidths
[i
];
437 * freq_in_rule_band - tells us if a frequency is in a frequency band
438 * @freq_range: frequency rule we want to query
439 * @freq_khz: frequency we are inquiring about
441 * This lets us know if a specific frequency rule is or is not relevant to
442 * a specific frequency's band. Bands are device specific and artificial
443 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
444 * safe for now to assume that a frequency rule should not be part of a
445 * frequency's band if the start freq or end freq are off by more than 2 GHz.
446 * This resolution can be lowered and should be considered as we add
447 * regulatory rule support for other "bands".
449 static bool freq_in_rule_band(const struct ieee80211_freq_range
*freq_range
,
452 #define ONE_GHZ_IN_KHZ 1000000
453 if (abs(freq_khz
- freq_range
->start_freq_khz
) <= (2 * ONE_GHZ_IN_KHZ
))
455 if (abs(freq_khz
- freq_range
->end_freq_khz
) <= (2 * ONE_GHZ_IN_KHZ
))
458 #undef ONE_GHZ_IN_KHZ
462 * Converts a country IE to a regulatory domain. A regulatory domain
463 * structure has a lot of information which the IE doesn't yet have,
464 * so for the other values we use upper max values as we will intersect
465 * with our userspace regulatory agent to get lower bounds.
467 static struct ieee80211_regdomain
*country_ie_2_rd(
472 struct ieee80211_regdomain
*rd
= NULL
;
476 u32 num_rules
= 0, size_of_regd
= 0;
477 u8
*triplets_start
= NULL
;
478 u8 len_at_triplet
= 0;
479 /* the last channel we have registered in a subband (triplet) */
480 int last_sub_max_channel
= 0;
482 *checksum
= 0xDEADBEEF;
484 /* Country IE requirements */
485 BUG_ON(country_ie_len
< IEEE80211_COUNTRY_IE_MIN_LEN
||
486 country_ie_len
& 0x01);
488 alpha2
[0] = country_ie
[0];
489 alpha2
[1] = country_ie
[1];
492 * Third octet can be:
496 * anything else we assume is no restrictions
498 if (country_ie
[2] == 'I')
499 flags
= NL80211_RRF_NO_OUTDOOR
;
500 else if (country_ie
[2] == 'O')
501 flags
= NL80211_RRF_NO_INDOOR
;
506 triplets_start
= country_ie
;
507 len_at_triplet
= country_ie_len
;
509 *checksum
^= ((flags
^ alpha2
[0] ^ alpha2
[1]) << 8);
512 * We need to build a reg rule for each triplet, but first we must
513 * calculate the number of reg rules we will need. We will need one
514 * for each channel subband
516 while (country_ie_len
>= 3) {
518 struct ieee80211_country_ie_triplet
*triplet
=
519 (struct ieee80211_country_ie_triplet
*) country_ie
;
520 int cur_sub_max_channel
= 0, cur_channel
= 0;
522 if (triplet
->ext
.reg_extension_id
>=
523 IEEE80211_COUNTRY_EXTENSION_ID
) {
530 if (triplet
->chans
.first_channel
<= 14)
531 end_channel
= triplet
->chans
.first_channel
+
532 triplet
->chans
.num_channels
;
535 * 5 GHz -- For example in country IEs if the first
536 * channel given is 36 and the number of channels is 4
537 * then the individual channel numbers defined for the
538 * 5 GHz PHY by these parameters are: 36, 40, 44, and 48
539 * and not 36, 37, 38, 39.
541 * See: http://tinyurl.com/11d-clarification
543 end_channel
= triplet
->chans
.first_channel
+
544 (4 * (triplet
->chans
.num_channels
- 1));
546 cur_channel
= triplet
->chans
.first_channel
;
547 cur_sub_max_channel
= end_channel
;
549 /* Basic sanity check */
550 if (cur_sub_max_channel
< cur_channel
)
554 * Do not allow overlapping channels. Also channels
555 * passed in each subband must be monotonically
558 if (last_sub_max_channel
) {
559 if (cur_channel
<= last_sub_max_channel
)
561 if (cur_sub_max_channel
<= last_sub_max_channel
)
566 * When dot11RegulatoryClassesRequired is supported
567 * we can throw ext triplets as part of this soup,
568 * for now we don't care when those change as we
571 *checksum
^= ((cur_channel
^ cur_sub_max_channel
) << 8) |
572 ((cur_sub_max_channel
^ cur_sub_max_channel
) << 16) |
573 ((triplet
->chans
.max_power
^ cur_sub_max_channel
) << 24);
575 last_sub_max_channel
= cur_sub_max_channel
;
582 * Note: this is not a IEEE requirement but
583 * simply a memory requirement
585 if (num_rules
> NL80211_MAX_SUPP_REG_RULES
)
589 country_ie
= triplets_start
;
590 country_ie_len
= len_at_triplet
;
592 size_of_regd
= sizeof(struct ieee80211_regdomain
) +
593 (num_rules
* sizeof(struct ieee80211_reg_rule
));
595 rd
= kzalloc(size_of_regd
, GFP_KERNEL
);
599 rd
->n_reg_rules
= num_rules
;
600 rd
->alpha2
[0] = alpha2
[0];
601 rd
->alpha2
[1] = alpha2
[1];
603 /* This time around we fill in the rd */
604 while (country_ie_len
>= 3) {
606 struct ieee80211_country_ie_triplet
*triplet
=
607 (struct ieee80211_country_ie_triplet
*) country_ie
;
608 struct ieee80211_reg_rule
*reg_rule
= NULL
;
609 struct ieee80211_freq_range
*freq_range
= NULL
;
610 struct ieee80211_power_rule
*power_rule
= NULL
;
613 * Must parse if dot11RegulatoryClassesRequired is true,
614 * we don't support this yet
616 if (triplet
->ext
.reg_extension_id
>=
617 IEEE80211_COUNTRY_EXTENSION_ID
) {
623 reg_rule
= &rd
->reg_rules
[i
];
624 freq_range
= ®_rule
->freq_range
;
625 power_rule
= ®_rule
->power_rule
;
627 reg_rule
->flags
= flags
;
630 if (triplet
->chans
.first_channel
<= 14)
631 end_channel
= triplet
->chans
.first_channel
+
632 triplet
->chans
.num_channels
;
634 end_channel
= triplet
->chans
.first_channel
+
635 (4 * (triplet
->chans
.num_channels
- 1));
638 * The +10 is since the regulatory domain expects
639 * the actual band edge, not the center of freq for
640 * its start and end freqs, assuming 20 MHz bandwidth on
641 * the channels passed
643 freq_range
->start_freq_khz
=
644 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
645 triplet
->chans
.first_channel
) - 10);
646 freq_range
->end_freq_khz
=
647 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
651 * These are large arbitrary values we use to intersect later.
652 * Increment this if we ever support >= 40 MHz channels
655 freq_range
->max_bandwidth_khz
= MHZ_TO_KHZ(40);
656 power_rule
->max_antenna_gain
= DBI_TO_MBI(100);
657 power_rule
->max_eirp
= DBM_TO_MBM(100);
663 BUG_ON(i
> NL80211_MAX_SUPP_REG_RULES
);
671 * Helper for regdom_intersect(), this does the real
672 * mathematical intersection fun
674 static int reg_rules_intersect(
675 const struct ieee80211_reg_rule
*rule1
,
676 const struct ieee80211_reg_rule
*rule2
,
677 struct ieee80211_reg_rule
*intersected_rule
)
679 const struct ieee80211_freq_range
*freq_range1
, *freq_range2
;
680 struct ieee80211_freq_range
*freq_range
;
681 const struct ieee80211_power_rule
*power_rule1
, *power_rule2
;
682 struct ieee80211_power_rule
*power_rule
;
685 freq_range1
= &rule1
->freq_range
;
686 freq_range2
= &rule2
->freq_range
;
687 freq_range
= &intersected_rule
->freq_range
;
689 power_rule1
= &rule1
->power_rule
;
690 power_rule2
= &rule2
->power_rule
;
691 power_rule
= &intersected_rule
->power_rule
;
693 freq_range
->start_freq_khz
= max(freq_range1
->start_freq_khz
,
694 freq_range2
->start_freq_khz
);
695 freq_range
->end_freq_khz
= min(freq_range1
->end_freq_khz
,
696 freq_range2
->end_freq_khz
);
697 freq_range
->max_bandwidth_khz
= min(freq_range1
->max_bandwidth_khz
,
698 freq_range2
->max_bandwidth_khz
);
700 freq_diff
= freq_range
->end_freq_khz
- freq_range
->start_freq_khz
;
701 if (freq_range
->max_bandwidth_khz
> freq_diff
)
702 freq_range
->max_bandwidth_khz
= freq_diff
;
704 power_rule
->max_eirp
= min(power_rule1
->max_eirp
,
705 power_rule2
->max_eirp
);
706 power_rule
->max_antenna_gain
= min(power_rule1
->max_antenna_gain
,
707 power_rule2
->max_antenna_gain
);
709 intersected_rule
->flags
= (rule1
->flags
| rule2
->flags
);
711 if (!is_valid_reg_rule(intersected_rule
))
718 * regdom_intersect - do the intersection between two regulatory domains
719 * @rd1: first regulatory domain
720 * @rd2: second regulatory domain
722 * Use this function to get the intersection between two regulatory domains.
723 * Once completed we will mark the alpha2 for the rd as intersected, "98",
724 * as no one single alpha2 can represent this regulatory domain.
726 * Returns a pointer to the regulatory domain structure which will hold the
727 * resulting intersection of rules between rd1 and rd2. We will
728 * kzalloc() this structure for you.
730 static struct ieee80211_regdomain
*regdom_intersect(
731 const struct ieee80211_regdomain
*rd1
,
732 const struct ieee80211_regdomain
*rd2
)
736 unsigned int num_rules
= 0, rule_idx
= 0;
737 const struct ieee80211_reg_rule
*rule1
, *rule2
;
738 struct ieee80211_reg_rule
*intersected_rule
;
739 struct ieee80211_regdomain
*rd
;
740 /* This is just a dummy holder to help us count */
741 struct ieee80211_reg_rule irule
;
743 /* Uses the stack temporarily for counter arithmetic */
744 intersected_rule
= &irule
;
746 memset(intersected_rule
, 0, sizeof(struct ieee80211_reg_rule
));
752 * First we get a count of the rules we'll need, then we actually
753 * build them. This is to so we can malloc() and free() a
754 * regdomain once. The reason we use reg_rules_intersect() here
755 * is it will return -EINVAL if the rule computed makes no sense.
756 * All rules that do check out OK are valid.
759 for (x
= 0; x
< rd1
->n_reg_rules
; x
++) {
760 rule1
= &rd1
->reg_rules
[x
];
761 for (y
= 0; y
< rd2
->n_reg_rules
; y
++) {
762 rule2
= &rd2
->reg_rules
[y
];
763 if (!reg_rules_intersect(rule1
, rule2
,
766 memset(intersected_rule
, 0,
767 sizeof(struct ieee80211_reg_rule
));
774 size_of_regd
= sizeof(struct ieee80211_regdomain
) +
775 ((num_rules
+ 1) * sizeof(struct ieee80211_reg_rule
));
777 rd
= kzalloc(size_of_regd
, GFP_KERNEL
);
781 for (x
= 0; x
< rd1
->n_reg_rules
; x
++) {
782 rule1
= &rd1
->reg_rules
[x
];
783 for (y
= 0; y
< rd2
->n_reg_rules
; y
++) {
784 rule2
= &rd2
->reg_rules
[y
];
786 * This time around instead of using the stack lets
787 * write to the target rule directly saving ourselves
790 intersected_rule
= &rd
->reg_rules
[rule_idx
];
791 r
= reg_rules_intersect(rule1
, rule2
,
794 * No need to memset here the intersected rule here as
795 * we're not using the stack anymore
803 if (rule_idx
!= num_rules
) {
808 rd
->n_reg_rules
= num_rules
;
816 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
817 * want to just have the channel structure use these
819 static u32
map_regdom_flags(u32 rd_flags
)
821 u32 channel_flags
= 0;
822 if (rd_flags
& NL80211_RRF_PASSIVE_SCAN
)
823 channel_flags
|= IEEE80211_CHAN_PASSIVE_SCAN
;
824 if (rd_flags
& NL80211_RRF_NO_IBSS
)
825 channel_flags
|= IEEE80211_CHAN_NO_IBSS
;
826 if (rd_flags
& NL80211_RRF_DFS
)
827 channel_flags
|= IEEE80211_CHAN_RADAR
;
828 return channel_flags
;
831 static int freq_reg_info_regd(struct wiphy
*wiphy
,
834 const struct ieee80211_reg_rule
**reg_rule
,
835 const struct ieee80211_regdomain
*custom_regd
)
838 bool band_rule_found
= false;
839 const struct ieee80211_regdomain
*regd
;
840 u32 max_bandwidth
= 0;
842 regd
= custom_regd
? custom_regd
: cfg80211_regdomain
;
845 * Follow the driver's regulatory domain, if present, unless a country
846 * IE has been processed or a user wants to help complaince further
848 if (last_request
->initiator
!= REGDOM_SET_BY_COUNTRY_IE
&&
849 last_request
->initiator
!= REGDOM_SET_BY_USER
&&
856 for (i
= 0; i
< regd
->n_reg_rules
; i
++) {
857 const struct ieee80211_reg_rule
*rr
;
858 const struct ieee80211_freq_range
*fr
= NULL
;
859 const struct ieee80211_power_rule
*pr
= NULL
;
861 rr
= ®d
->reg_rules
[i
];
862 fr
= &rr
->freq_range
;
863 pr
= &rr
->power_rule
;
866 * We only need to know if one frequency rule was
867 * was in center_freq's band, that's enough, so lets
868 * not overwrite it once found
870 if (!band_rule_found
)
871 band_rule_found
= freq_in_rule_band(fr
, center_freq
);
873 max_bandwidth
= freq_max_bandwidth(fr
, center_freq
);
875 if (max_bandwidth
&& *bandwidth
<= max_bandwidth
) {
877 *bandwidth
= max_bandwidth
;
882 if (!band_rule_found
)
885 return !max_bandwidth
;
887 EXPORT_SYMBOL(freq_reg_info
);
889 int freq_reg_info(struct wiphy
*wiphy
, u32 center_freq
, u32
*bandwidth
,
890 const struct ieee80211_reg_rule
**reg_rule
)
892 return freq_reg_info_regd(wiphy
, center_freq
,
893 bandwidth
, reg_rule
, NULL
);
896 static void handle_channel(struct wiphy
*wiphy
, enum ieee80211_band band
,
897 unsigned int chan_idx
)
901 u32 max_bandwidth
= 0;
902 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
903 const struct ieee80211_power_rule
*power_rule
= NULL
;
904 struct ieee80211_supported_band
*sband
;
905 struct ieee80211_channel
*chan
;
906 struct wiphy
*request_wiphy
= NULL
;
908 assert_cfg80211_lock();
910 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
912 sband
= wiphy
->bands
[band
];
913 BUG_ON(chan_idx
>= sband
->n_channels
);
914 chan
= &sband
->channels
[chan_idx
];
916 flags
= chan
->orig_flags
;
918 r
= freq_reg_info(wiphy
, MHZ_TO_KHZ(chan
->center_freq
),
919 &max_bandwidth
, ®_rule
);
923 * This means no regulatory rule was found in the country IE
924 * with a frequency range on the center_freq's band, since
925 * IEEE-802.11 allows for a country IE to have a subset of the
926 * regulatory information provided in a country we ignore
927 * disabling the channel unless at least one reg rule was
928 * found on the center_freq's band. For details see this
931 * http://tinyurl.com/11d-clarification
934 last_request
->initiator
== REGDOM_SET_BY_COUNTRY_IE
) {
935 #ifdef CONFIG_CFG80211_REG_DEBUG
936 printk(KERN_DEBUG
"cfg80211: Leaving channel %d MHz "
937 "intact on %s - no rule found in band on "
939 chan
->center_freq
, wiphy_name(wiphy
));
943 * In this case we know the country IE has at least one reg rule
944 * for the band so we respect its band definitions
946 #ifdef CONFIG_CFG80211_REG_DEBUG
947 if (last_request
->initiator
== REGDOM_SET_BY_COUNTRY_IE
)
948 printk(KERN_DEBUG
"cfg80211: Disabling "
949 "channel %d MHz on %s due to "
951 chan
->center_freq
, wiphy_name(wiphy
));
953 flags
|= IEEE80211_CHAN_DISABLED
;
959 power_rule
= ®_rule
->power_rule
;
961 if (last_request
->initiator
== REGDOM_SET_BY_DRIVER
&&
962 request_wiphy
&& request_wiphy
== wiphy
&&
963 request_wiphy
->strict_regulatory
) {
965 * This gaurantees the driver's requested regulatory domain
966 * will always be used as a base for further regulatory
969 chan
->flags
= chan
->orig_flags
=
970 map_regdom_flags(reg_rule
->flags
);
971 chan
->max_antenna_gain
= chan
->orig_mag
=
972 (int) MBI_TO_DBI(power_rule
->max_antenna_gain
);
973 chan
->max_bandwidth
= KHZ_TO_MHZ(max_bandwidth
);
974 chan
->max_power
= chan
->orig_mpwr
=
975 (int) MBM_TO_DBM(power_rule
->max_eirp
);
979 chan
->flags
= flags
| map_regdom_flags(reg_rule
->flags
);
980 chan
->max_antenna_gain
= min(chan
->orig_mag
,
981 (int) MBI_TO_DBI(power_rule
->max_antenna_gain
));
982 chan
->max_bandwidth
= KHZ_TO_MHZ(max_bandwidth
);
984 chan
->max_power
= min(chan
->orig_mpwr
,
985 (int) MBM_TO_DBM(power_rule
->max_eirp
));
987 chan
->max_power
= (int) MBM_TO_DBM(power_rule
->max_eirp
);
990 static void handle_band(struct wiphy
*wiphy
, enum ieee80211_band band
)
993 struct ieee80211_supported_band
*sband
;
995 BUG_ON(!wiphy
->bands
[band
]);
996 sband
= wiphy
->bands
[band
];
998 for (i
= 0; i
< sband
->n_channels
; i
++)
999 handle_channel(wiphy
, band
, i
);
1002 static bool ignore_reg_update(struct wiphy
*wiphy
, enum reg_set_by setby
)
1006 if (setby
== REGDOM_SET_BY_CORE
&&
1007 wiphy
->custom_regulatory
)
1010 * wiphy->regd will be set once the device has its own
1011 * desired regulatory domain set
1013 if (wiphy
->strict_regulatory
&& !wiphy
->regd
&&
1014 !is_world_regdom(last_request
->alpha2
))
1019 static void update_all_wiphy_regulatory(enum reg_set_by setby
)
1021 struct cfg80211_registered_device
*drv
;
1023 list_for_each_entry(drv
, &cfg80211_drv_list
, list
)
1024 wiphy_update_regulatory(&drv
->wiphy
, setby
);
1027 static void handle_reg_beacon(struct wiphy
*wiphy
,
1028 unsigned int chan_idx
,
1029 struct reg_beacon
*reg_beacon
)
1031 #ifdef CONFIG_CFG80211_REG_DEBUG
1032 #define REG_DEBUG_BEACON_FLAG(desc) \
1033 printk(KERN_DEBUG "cfg80211: Enabling " desc " on " \
1034 "frequency: %d MHz (Ch %d) on %s\n", \
1035 reg_beacon->chan.center_freq, \
1036 ieee80211_frequency_to_channel(reg_beacon->chan.center_freq), \
1039 #define REG_DEBUG_BEACON_FLAG(desc) do {} while (0)
1041 struct ieee80211_supported_band
*sband
;
1042 struct ieee80211_channel
*chan
;
1044 assert_cfg80211_lock();
1046 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
1047 chan
= &sband
->channels
[chan_idx
];
1049 if (likely(chan
->center_freq
!= reg_beacon
->chan
.center_freq
))
1052 if (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
) {
1053 chan
->flags
&= ~IEEE80211_CHAN_PASSIVE_SCAN
;
1054 REG_DEBUG_BEACON_FLAG("active scanning");
1057 if (chan
->flags
& IEEE80211_CHAN_NO_IBSS
) {
1058 chan
->flags
&= ~IEEE80211_CHAN_NO_IBSS
;
1059 REG_DEBUG_BEACON_FLAG("beaconing");
1062 chan
->beacon_found
= true;
1063 #undef REG_DEBUG_BEACON_FLAG
1067 * Called when a scan on a wiphy finds a beacon on
1070 static void wiphy_update_new_beacon(struct wiphy
*wiphy
,
1071 struct reg_beacon
*reg_beacon
)
1074 struct ieee80211_supported_band
*sband
;
1076 assert_cfg80211_lock();
1078 if (!wiphy
->bands
[reg_beacon
->chan
.band
])
1081 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
1083 for (i
= 0; i
< sband
->n_channels
; i
++)
1084 handle_reg_beacon(wiphy
, i
, reg_beacon
);
1088 * Called upon reg changes or a new wiphy is added
1090 static void wiphy_update_beacon_reg(struct wiphy
*wiphy
)
1093 struct ieee80211_supported_band
*sband
;
1094 struct reg_beacon
*reg_beacon
;
1096 assert_cfg80211_lock();
1098 if (list_empty(®_beacon_list
))
1101 list_for_each_entry(reg_beacon
, ®_beacon_list
, list
) {
1102 if (!wiphy
->bands
[reg_beacon
->chan
.band
])
1104 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
1105 for (i
= 0; i
< sband
->n_channels
; i
++)
1106 handle_reg_beacon(wiphy
, i
, reg_beacon
);
1110 static bool reg_is_world_roaming(struct wiphy
*wiphy
)
1112 if (is_world_regdom(cfg80211_regdomain
->alpha2
) ||
1113 (wiphy
->regd
&& is_world_regdom(wiphy
->regd
->alpha2
)))
1115 if (last_request
->initiator
!= REGDOM_SET_BY_COUNTRY_IE
&&
1116 wiphy
->custom_regulatory
)
1121 /* Reap the advantages of previously found beacons */
1122 static void reg_process_beacons(struct wiphy
*wiphy
)
1124 if (!reg_is_world_roaming(wiphy
))
1126 wiphy_update_beacon_reg(wiphy
);
1129 void wiphy_update_regulatory(struct wiphy
*wiphy
, enum reg_set_by setby
)
1131 enum ieee80211_band band
;
1133 if (ignore_reg_update(wiphy
, setby
))
1135 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
1136 if (wiphy
->bands
[band
])
1137 handle_band(wiphy
, band
);
1140 reg_process_beacons(wiphy
);
1141 if (wiphy
->reg_notifier
)
1142 wiphy
->reg_notifier(wiphy
, last_request
);
1145 static void handle_channel_custom(struct wiphy
*wiphy
,
1146 enum ieee80211_band band
,
1147 unsigned int chan_idx
,
1148 const struct ieee80211_regdomain
*regd
)
1151 u32 max_bandwidth
= 0;
1152 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
1153 const struct ieee80211_power_rule
*power_rule
= NULL
;
1154 struct ieee80211_supported_band
*sband
;
1155 struct ieee80211_channel
*chan
;
1157 sband
= wiphy
->bands
[band
];
1158 BUG_ON(chan_idx
>= sband
->n_channels
);
1159 chan
= &sband
->channels
[chan_idx
];
1161 r
= freq_reg_info_regd(wiphy
, MHZ_TO_KHZ(chan
->center_freq
),
1162 &max_bandwidth
, ®_rule
, regd
);
1165 chan
->flags
= IEEE80211_CHAN_DISABLED
;
1169 power_rule
= ®_rule
->power_rule
;
1171 chan
->flags
|= map_regdom_flags(reg_rule
->flags
);
1172 chan
->max_antenna_gain
= (int) MBI_TO_DBI(power_rule
->max_antenna_gain
);
1173 chan
->max_bandwidth
= KHZ_TO_MHZ(max_bandwidth
);
1174 chan
->max_power
= (int) MBM_TO_DBM(power_rule
->max_eirp
);
1177 static void handle_band_custom(struct wiphy
*wiphy
, enum ieee80211_band band
,
1178 const struct ieee80211_regdomain
*regd
)
1181 struct ieee80211_supported_band
*sband
;
1183 BUG_ON(!wiphy
->bands
[band
]);
1184 sband
= wiphy
->bands
[band
];
1186 for (i
= 0; i
< sband
->n_channels
; i
++)
1187 handle_channel_custom(wiphy
, band
, i
, regd
);
1190 /* Used by drivers prior to wiphy registration */
1191 void wiphy_apply_custom_regulatory(struct wiphy
*wiphy
,
1192 const struct ieee80211_regdomain
*regd
)
1194 enum ieee80211_band band
;
1195 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
1196 if (wiphy
->bands
[band
])
1197 handle_band_custom(wiphy
, band
, regd
);
1200 EXPORT_SYMBOL(wiphy_apply_custom_regulatory
);
1202 static int reg_copy_regd(const struct ieee80211_regdomain
**dst_regd
,
1203 const struct ieee80211_regdomain
*src_regd
)
1205 struct ieee80211_regdomain
*regd
;
1206 int size_of_regd
= 0;
1209 size_of_regd
= sizeof(struct ieee80211_regdomain
) +
1210 ((src_regd
->n_reg_rules
+ 1) * sizeof(struct ieee80211_reg_rule
));
1212 regd
= kzalloc(size_of_regd
, GFP_KERNEL
);
1216 memcpy(regd
, src_regd
, sizeof(struct ieee80211_regdomain
));
1218 for (i
= 0; i
< src_regd
->n_reg_rules
; i
++)
1219 memcpy(®d
->reg_rules
[i
], &src_regd
->reg_rules
[i
],
1220 sizeof(struct ieee80211_reg_rule
));
1227 * Return value which can be used by ignore_request() to indicate
1228 * it has been determined we should intersect two regulatory domains
1230 #define REG_INTERSECT 1
1232 /* This has the logic which determines when a new request
1233 * should be ignored. */
1234 static int ignore_request(struct wiphy
*wiphy
, enum reg_set_by set_by
,
1237 struct wiphy
*last_wiphy
= NULL
;
1239 assert_cfg80211_lock();
1241 /* All initial requests are respected */
1246 case REGDOM_SET_BY_INIT
:
1248 case REGDOM_SET_BY_CORE
:
1250 case REGDOM_SET_BY_COUNTRY_IE
:
1252 last_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
1254 if (unlikely(!is_an_alpha2(alpha2
)))
1256 if (last_request
->initiator
== REGDOM_SET_BY_COUNTRY_IE
) {
1257 if (last_wiphy
!= wiphy
) {
1259 * Two cards with two APs claiming different
1260 * different Country IE alpha2s. We could
1261 * intersect them, but that seems unlikely
1262 * to be correct. Reject second one for now.
1264 if (regdom_changes(alpha2
))
1269 * Two consecutive Country IE hints on the same wiphy.
1270 * This should be picked up early by the driver/stack
1272 if (WARN_ON(regdom_changes(alpha2
)))
1276 return REG_INTERSECT
;
1277 case REGDOM_SET_BY_DRIVER
:
1278 if (last_request
->initiator
== REGDOM_SET_BY_CORE
) {
1279 if (is_old_static_regdom(cfg80211_regdomain
))
1281 if (regdom_changes(alpha2
))
1287 * This would happen if you unplug and plug your card
1288 * back in or if you add a new device for which the previously
1289 * loaded card also agrees on the regulatory domain.
1291 if (last_request
->initiator
== REGDOM_SET_BY_DRIVER
&&
1292 !regdom_changes(alpha2
))
1295 return REG_INTERSECT
;
1296 case REGDOM_SET_BY_USER
:
1297 if (last_request
->initiator
== REGDOM_SET_BY_COUNTRY_IE
)
1298 return REG_INTERSECT
;
1300 * If the user knows better the user should set the regdom
1301 * to their country before the IE is picked up
1303 if (last_request
->initiator
== REGDOM_SET_BY_USER
&&
1304 last_request
->intersect
)
1307 * Process user requests only after previous user/driver/core
1308 * requests have been processed
1310 if (last_request
->initiator
== REGDOM_SET_BY_CORE
||
1311 last_request
->initiator
== REGDOM_SET_BY_DRIVER
||
1312 last_request
->initiator
== REGDOM_SET_BY_USER
) {
1313 if (regdom_changes(last_request
->alpha2
))
1317 if (!is_old_static_regdom(cfg80211_regdomain
) &&
1318 !regdom_changes(alpha2
))
1327 /* Caller must hold &cfg80211_mutex */
1328 int __regulatory_hint(struct wiphy
*wiphy
, enum reg_set_by set_by
,
1330 u32 country_ie_checksum
,
1331 enum environment_cap env
)
1333 struct regulatory_request
*request
;
1334 bool intersect
= false;
1337 assert_cfg80211_lock();
1339 r
= ignore_request(wiphy
, set_by
, alpha2
);
1341 if (r
== REG_INTERSECT
) {
1342 if (set_by
== REGDOM_SET_BY_DRIVER
) {
1343 r
= reg_copy_regd(&wiphy
->regd
, cfg80211_regdomain
);
1350 * If the regulatory domain being requested by the
1351 * driver has already been set just copy it to the
1354 if (r
== -EALREADY
&& set_by
== REGDOM_SET_BY_DRIVER
) {
1355 r
= reg_copy_regd(&wiphy
->regd
, cfg80211_regdomain
);
1365 request
= kzalloc(sizeof(struct regulatory_request
),
1370 request
->alpha2
[0] = alpha2
[0];
1371 request
->alpha2
[1] = alpha2
[1];
1372 request
->initiator
= set_by
;
1373 request
->wiphy_idx
= get_wiphy_idx(wiphy
);
1374 request
->intersect
= intersect
;
1375 request
->country_ie_checksum
= country_ie_checksum
;
1376 request
->country_ie_env
= env
;
1378 kfree(last_request
);
1379 last_request
= request
;
1381 /* When r == REG_INTERSECT we do need to call CRDA */
1386 * Note: When CONFIG_WIRELESS_OLD_REGULATORY is enabled
1387 * AND if CRDA is NOT present nothing will happen, if someone
1388 * wants to bother with 11d with OLD_REG you can add a timer.
1389 * If after x amount of time nothing happens you can call:
1391 * return set_regdom(country_ie_regdomain);
1393 * to intersect with the static rd
1395 return call_crda(alpha2
);
1398 /* This currently only processes user and driver regulatory hints */
1399 static int reg_process_hint(struct regulatory_request
*reg_request
)
1402 struct wiphy
*wiphy
= NULL
;
1404 BUG_ON(!reg_request
->alpha2
);
1406 mutex_lock(&cfg80211_mutex
);
1408 if (wiphy_idx_valid(reg_request
->wiphy_idx
))
1409 wiphy
= wiphy_idx_to_wiphy(reg_request
->wiphy_idx
);
1411 if (reg_request
->initiator
== REGDOM_SET_BY_DRIVER
&&
1417 r
= __regulatory_hint(wiphy
,
1418 reg_request
->initiator
,
1419 reg_request
->alpha2
,
1420 reg_request
->country_ie_checksum
,
1421 reg_request
->country_ie_env
);
1422 /* This is required so that the orig_* parameters are saved */
1423 if (r
== -EALREADY
&& wiphy
&& wiphy
->strict_regulatory
)
1424 wiphy_update_regulatory(wiphy
, reg_request
->initiator
);
1426 mutex_unlock(&cfg80211_mutex
);
1434 /* Processes regulatory hints, this is all the REGDOM_SET_BY_* */
1435 static void reg_process_pending_hints(void)
1437 struct regulatory_request
*reg_request
;
1440 spin_lock(®_requests_lock
);
1441 while (!list_empty(®_requests_list
)) {
1442 reg_request
= list_first_entry(®_requests_list
,
1443 struct regulatory_request
,
1445 list_del_init(®_request
->list
);
1446 spin_unlock(®_requests_lock
);
1448 r
= reg_process_hint(reg_request
);
1449 #ifdef CONFIG_CFG80211_REG_DEBUG
1450 if (r
&& (reg_request
->initiator
== REGDOM_SET_BY_DRIVER
||
1451 reg_request
->initiator
== REGDOM_SET_BY_COUNTRY_IE
))
1452 printk(KERN_ERR
"cfg80211: wiphy_idx %d sent a "
1453 "regulatory hint for %c%c but now has "
1454 "gone fishing, ignoring request\n",
1455 reg_request
->wiphy_idx
,
1456 reg_request
->alpha2
[0],
1457 reg_request
->alpha2
[1]);
1460 spin_lock(®_requests_lock
);
1462 spin_unlock(®_requests_lock
);
1465 /* Processes beacon hints -- this has nothing to do with country IEs */
1466 static void reg_process_pending_beacon_hints(void)
1468 struct cfg80211_registered_device
*drv
;
1469 struct reg_beacon
*pending_beacon
, *tmp
;
1471 mutex_lock(&cfg80211_mutex
);
1473 /* This goes through the _pending_ beacon list */
1474 spin_lock_bh(®_pending_beacons_lock
);
1476 if (list_empty(®_pending_beacons
)) {
1477 spin_unlock_bh(®_pending_beacons_lock
);
1481 list_for_each_entry_safe(pending_beacon
, tmp
,
1482 ®_pending_beacons
, list
) {
1484 list_del_init(&pending_beacon
->list
);
1486 /* Applies the beacon hint to current wiphys */
1487 list_for_each_entry(drv
, &cfg80211_drv_list
, list
)
1488 wiphy_update_new_beacon(&drv
->wiphy
, pending_beacon
);
1490 /* Remembers the beacon hint for new wiphys or reg changes */
1491 list_add_tail(&pending_beacon
->list
, ®_beacon_list
);
1494 spin_unlock_bh(®_pending_beacons_lock
);
1496 mutex_unlock(&cfg80211_mutex
);
1499 static void reg_todo(struct work_struct
*work
)
1501 reg_process_pending_hints();
1502 reg_process_pending_beacon_hints();
1505 static DECLARE_WORK(reg_work
, reg_todo
);
1507 static void queue_regulatory_request(struct regulatory_request
*request
)
1509 spin_lock(®_requests_lock
);
1510 list_add_tail(&request
->list
, ®_requests_list
);
1511 spin_unlock(®_requests_lock
);
1513 schedule_work(®_work
);
1516 /* Core regulatory hint -- happens once during cfg80211_init() */
1517 static int regulatory_hint_core(const char *alpha2
)
1519 struct regulatory_request
*request
;
1521 BUG_ON(last_request
);
1523 request
= kzalloc(sizeof(struct regulatory_request
),
1528 request
->alpha2
[0] = alpha2
[0];
1529 request
->alpha2
[1] = alpha2
[1];
1530 request
->initiator
= REGDOM_SET_BY_CORE
;
1532 queue_regulatory_request(request
);
1538 int regulatory_hint_user(const char *alpha2
)
1540 struct regulatory_request
*request
;
1544 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
1548 request
->wiphy_idx
= WIPHY_IDX_STALE
;
1549 request
->alpha2
[0] = alpha2
[0];
1550 request
->alpha2
[1] = alpha2
[1];
1551 request
->initiator
= REGDOM_SET_BY_USER
,
1553 queue_regulatory_request(request
);
1559 int regulatory_hint(struct wiphy
*wiphy
, const char *alpha2
)
1561 struct regulatory_request
*request
;
1566 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
1570 request
->wiphy_idx
= get_wiphy_idx(wiphy
);
1572 /* Must have registered wiphy first */
1573 BUG_ON(!wiphy_idx_valid(request
->wiphy_idx
));
1575 request
->alpha2
[0] = alpha2
[0];
1576 request
->alpha2
[1] = alpha2
[1];
1577 request
->initiator
= REGDOM_SET_BY_DRIVER
;
1579 queue_regulatory_request(request
);
1583 EXPORT_SYMBOL(regulatory_hint
);
1585 static bool reg_same_country_ie_hint(struct wiphy
*wiphy
,
1586 u32 country_ie_checksum
)
1588 struct wiphy
*request_wiphy
;
1590 assert_cfg80211_lock();
1592 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
1597 if (likely(request_wiphy
!= wiphy
))
1598 return !country_ie_integrity_changes(country_ie_checksum
);
1600 * We should not have let these through at this point, they
1601 * should have been picked up earlier by the first alpha2 check
1604 if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum
)))
1609 void regulatory_hint_11d(struct wiphy
*wiphy
,
1613 struct ieee80211_regdomain
*rd
= NULL
;
1616 enum environment_cap env
= ENVIRON_ANY
;
1617 struct regulatory_request
*request
;
1619 mutex_lock(&cfg80211_mutex
);
1621 if (unlikely(!last_request
)) {
1622 mutex_unlock(&cfg80211_mutex
);
1626 /* IE len must be evenly divisible by 2 */
1627 if (country_ie_len
& 0x01)
1630 if (country_ie_len
< IEEE80211_COUNTRY_IE_MIN_LEN
)
1634 * Pending country IE processing, this can happen after we
1635 * call CRDA and wait for a response if a beacon was received before
1636 * we were able to process the last regulatory_hint_11d() call
1638 if (country_ie_regdomain
)
1641 alpha2
[0] = country_ie
[0];
1642 alpha2
[1] = country_ie
[1];
1644 if (country_ie
[2] == 'I')
1645 env
= ENVIRON_INDOOR
;
1646 else if (country_ie
[2] == 'O')
1647 env
= ENVIRON_OUTDOOR
;
1650 * We will run this for *every* beacon processed for the BSSID, so
1651 * we optimize an early check to exit out early if we don't have to
1654 if (likely(wiphy_idx_valid(last_request
->wiphy_idx
))) {
1655 struct cfg80211_registered_device
*drv_last_ie
;
1658 cfg80211_drv_by_wiphy_idx(last_request
->wiphy_idx
);
1661 * Lets keep this simple -- we trust the first AP
1662 * after we intersect with CRDA
1664 if (likely(&drv_last_ie
->wiphy
== wiphy
)) {
1666 * Ignore IEs coming in on this wiphy with
1667 * the same alpha2 and environment cap
1669 if (likely(alpha2_equal(drv_last_ie
->country_ie_alpha2
,
1671 env
== drv_last_ie
->env
)) {
1675 * the wiphy moved on to another BSSID or the AP
1676 * was reconfigured. XXX: We need to deal with the
1677 * case where the user suspends and goes to goes
1678 * to another country, and then gets IEs from an
1679 * AP with different settings
1684 * Ignore IEs coming in on two separate wiphys with
1685 * the same alpha2 and environment cap
1687 if (likely(alpha2_equal(drv_last_ie
->country_ie_alpha2
,
1689 env
== drv_last_ie
->env
)) {
1692 /* We could potentially intersect though */
1697 rd
= country_ie_2_rd(country_ie
, country_ie_len
, &checksum
);
1702 * This will not happen right now but we leave it here for the
1703 * the future when we want to add suspend/resume support and having
1704 * the user move to another country after doing so, or having the user
1705 * move to another AP. Right now we just trust the first AP.
1707 * If we hit this before we add this support we want to be informed of
1708 * it as it would indicate a mistake in the current design
1710 if (WARN_ON(reg_same_country_ie_hint(wiphy
, checksum
)))
1713 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
1718 * We keep this around for when CRDA comes back with a response so
1719 * we can intersect with that
1721 country_ie_regdomain
= rd
;
1723 request
->wiphy_idx
= get_wiphy_idx(wiphy
);
1724 request
->alpha2
[0] = rd
->alpha2
[0];
1725 request
->alpha2
[1] = rd
->alpha2
[1];
1726 request
->initiator
= REGDOM_SET_BY_COUNTRY_IE
;
1727 request
->country_ie_checksum
= checksum
;
1728 request
->country_ie_env
= env
;
1730 mutex_unlock(&cfg80211_mutex
);
1732 queue_regulatory_request(request
);
1739 mutex_unlock(&cfg80211_mutex
);
1741 EXPORT_SYMBOL(regulatory_hint_11d
);
1743 static bool freq_is_chan_12_13_14(u16 freq
)
1745 if (freq
== ieee80211_channel_to_frequency(12) ||
1746 freq
== ieee80211_channel_to_frequency(13) ||
1747 freq
== ieee80211_channel_to_frequency(14))
1752 int regulatory_hint_found_beacon(struct wiphy
*wiphy
,
1753 struct ieee80211_channel
*beacon_chan
,
1756 struct reg_beacon
*reg_beacon
;
1758 if (likely((beacon_chan
->beacon_found
||
1759 (beacon_chan
->flags
& IEEE80211_CHAN_RADAR
) ||
1760 (beacon_chan
->band
== IEEE80211_BAND_2GHZ
&&
1761 !freq_is_chan_12_13_14(beacon_chan
->center_freq
)))))
1764 reg_beacon
= kzalloc(sizeof(struct reg_beacon
), gfp
);
1768 #ifdef CONFIG_CFG80211_REG_DEBUG
1769 printk(KERN_DEBUG
"cfg80211: Found new beacon on "
1770 "frequency: %d MHz (Ch %d) on %s\n",
1771 beacon_chan
->center_freq
,
1772 ieee80211_frequency_to_channel(beacon_chan
->center_freq
),
1775 memcpy(®_beacon
->chan
, beacon_chan
,
1776 sizeof(struct ieee80211_channel
));
1780 * Since we can be called from BH or and non-BH context
1781 * we must use spin_lock_bh()
1783 spin_lock_bh(®_pending_beacons_lock
);
1784 list_add_tail(®_beacon
->list
, ®_pending_beacons
);
1785 spin_unlock_bh(®_pending_beacons_lock
);
1787 schedule_work(®_work
);
1792 static void print_rd_rules(const struct ieee80211_regdomain
*rd
)
1795 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
1796 const struct ieee80211_freq_range
*freq_range
= NULL
;
1797 const struct ieee80211_power_rule
*power_rule
= NULL
;
1799 printk(KERN_INFO
"\t(start_freq - end_freq @ bandwidth), "
1800 "(max_antenna_gain, max_eirp)\n");
1802 for (i
= 0; i
< rd
->n_reg_rules
; i
++) {
1803 reg_rule
= &rd
->reg_rules
[i
];
1804 freq_range
= ®_rule
->freq_range
;
1805 power_rule
= ®_rule
->power_rule
;
1808 * There may not be documentation for max antenna gain
1809 * in certain regions
1811 if (power_rule
->max_antenna_gain
)
1812 printk(KERN_INFO
"\t(%d KHz - %d KHz @ %d KHz), "
1813 "(%d mBi, %d mBm)\n",
1814 freq_range
->start_freq_khz
,
1815 freq_range
->end_freq_khz
,
1816 freq_range
->max_bandwidth_khz
,
1817 power_rule
->max_antenna_gain
,
1818 power_rule
->max_eirp
);
1820 printk(KERN_INFO
"\t(%d KHz - %d KHz @ %d KHz), "
1822 freq_range
->start_freq_khz
,
1823 freq_range
->end_freq_khz
,
1824 freq_range
->max_bandwidth_khz
,
1825 power_rule
->max_eirp
);
1829 static void print_regdomain(const struct ieee80211_regdomain
*rd
)
1832 if (is_intersected_alpha2(rd
->alpha2
)) {
1834 if (last_request
->initiator
== REGDOM_SET_BY_COUNTRY_IE
) {
1835 struct cfg80211_registered_device
*drv
;
1836 drv
= cfg80211_drv_by_wiphy_idx(
1837 last_request
->wiphy_idx
);
1839 printk(KERN_INFO
"cfg80211: Current regulatory "
1840 "domain updated by AP to: %c%c\n",
1841 drv
->country_ie_alpha2
[0],
1842 drv
->country_ie_alpha2
[1]);
1844 printk(KERN_INFO
"cfg80211: Current regulatory "
1845 "domain intersected: \n");
1847 printk(KERN_INFO
"cfg80211: Current regulatory "
1848 "domain intersected: \n");
1849 } else if (is_world_regdom(rd
->alpha2
))
1850 printk(KERN_INFO
"cfg80211: World regulatory "
1851 "domain updated:\n");
1853 if (is_unknown_alpha2(rd
->alpha2
))
1854 printk(KERN_INFO
"cfg80211: Regulatory domain "
1855 "changed to driver built-in settings "
1856 "(unknown country)\n");
1858 printk(KERN_INFO
"cfg80211: Regulatory domain "
1859 "changed to country: %c%c\n",
1860 rd
->alpha2
[0], rd
->alpha2
[1]);
1865 static void print_regdomain_info(const struct ieee80211_regdomain
*rd
)
1867 printk(KERN_INFO
"cfg80211: Regulatory domain: %c%c\n",
1868 rd
->alpha2
[0], rd
->alpha2
[1]);
1872 #ifdef CONFIG_CFG80211_REG_DEBUG
1873 static void reg_country_ie_process_debug(
1874 const struct ieee80211_regdomain
*rd
,
1875 const struct ieee80211_regdomain
*country_ie_regdomain
,
1876 const struct ieee80211_regdomain
*intersected_rd
)
1878 printk(KERN_DEBUG
"cfg80211: Received country IE:\n");
1879 print_regdomain_info(country_ie_regdomain
);
1880 printk(KERN_DEBUG
"cfg80211: CRDA thinks this should applied:\n");
1881 print_regdomain_info(rd
);
1882 if (intersected_rd
) {
1883 printk(KERN_DEBUG
"cfg80211: We intersect both of these "
1885 print_regdomain_info(intersected_rd
);
1888 printk(KERN_DEBUG
"cfg80211: Intersection between both failed\n");
1891 static inline void reg_country_ie_process_debug(
1892 const struct ieee80211_regdomain
*rd
,
1893 const struct ieee80211_regdomain
*country_ie_regdomain
,
1894 const struct ieee80211_regdomain
*intersected_rd
)
1899 /* Takes ownership of rd only if it doesn't fail */
1900 static int __set_regdom(const struct ieee80211_regdomain
*rd
)
1902 const struct ieee80211_regdomain
*intersected_rd
= NULL
;
1903 struct cfg80211_registered_device
*drv
= NULL
;
1904 struct wiphy
*request_wiphy
;
1905 /* Some basic sanity checks first */
1907 if (is_world_regdom(rd
->alpha2
)) {
1908 if (WARN_ON(!reg_is_valid_request(rd
->alpha2
)))
1910 update_world_regdomain(rd
);
1914 if (!is_alpha2_set(rd
->alpha2
) && !is_an_alpha2(rd
->alpha2
) &&
1915 !is_unknown_alpha2(rd
->alpha2
))
1922 * Lets only bother proceeding on the same alpha2 if the current
1923 * rd is non static (it means CRDA was present and was used last)
1924 * and the pending request came in from a country IE
1926 if (last_request
->initiator
!= REGDOM_SET_BY_COUNTRY_IE
) {
1928 * If someone else asked us to change the rd lets only bother
1929 * checking if the alpha2 changes if CRDA was already called
1931 if (!is_old_static_regdom(cfg80211_regdomain
) &&
1932 !regdom_changes(rd
->alpha2
))
1937 * Now lets set the regulatory domain, update all driver channels
1938 * and finally inform them of what we have done, in case they want
1939 * to review or adjust their own settings based on their own
1940 * internal EEPROM data
1943 if (WARN_ON(!reg_is_valid_request(rd
->alpha2
)))
1946 if (!is_valid_rd(rd
)) {
1947 printk(KERN_ERR
"cfg80211: Invalid "
1948 "regulatory domain detected:\n");
1949 print_regdomain_info(rd
);
1953 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
1955 if (!last_request
->intersect
) {
1958 if (last_request
->initiator
!= REGDOM_SET_BY_DRIVER
) {
1960 cfg80211_regdomain
= rd
;
1965 * For a driver hint, lets copy the regulatory domain the
1966 * driver wanted to the wiphy to deal with conflicts
1969 BUG_ON(request_wiphy
->regd
);
1971 r
= reg_copy_regd(&request_wiphy
->regd
, rd
);
1976 cfg80211_regdomain
= rd
;
1980 /* Intersection requires a bit more work */
1982 if (last_request
->initiator
!= REGDOM_SET_BY_COUNTRY_IE
) {
1984 intersected_rd
= regdom_intersect(rd
, cfg80211_regdomain
);
1985 if (!intersected_rd
)
1989 * We can trash what CRDA provided now.
1990 * However if a driver requested this specific regulatory
1991 * domain we keep it for its private use
1993 if (last_request
->initiator
== REGDOM_SET_BY_DRIVER
)
1994 request_wiphy
->regd
= rd
;
2001 cfg80211_regdomain
= intersected_rd
;
2007 * Country IE requests are handled a bit differently, we intersect
2008 * the country IE rd with what CRDA believes that country should have
2011 BUG_ON(!country_ie_regdomain
);
2013 if (rd
!= country_ie_regdomain
) {
2015 * Intersect what CRDA returned and our what we
2016 * had built from the Country IE received
2019 intersected_rd
= regdom_intersect(rd
, country_ie_regdomain
);
2021 reg_country_ie_process_debug(rd
, country_ie_regdomain
,
2024 kfree(country_ie_regdomain
);
2025 country_ie_regdomain
= NULL
;
2028 * This would happen when CRDA was not present and
2029 * OLD_REGULATORY was enabled. We intersect our Country
2030 * IE rd and what was set on cfg80211 originally
2032 intersected_rd
= regdom_intersect(rd
, cfg80211_regdomain
);
2035 if (!intersected_rd
)
2038 drv
= wiphy_to_dev(request_wiphy
);
2040 drv
->country_ie_alpha2
[0] = rd
->alpha2
[0];
2041 drv
->country_ie_alpha2
[1] = rd
->alpha2
[1];
2042 drv
->env
= last_request
->country_ie_env
;
2044 BUG_ON(intersected_rd
== rd
);
2050 cfg80211_regdomain
= intersected_rd
;
2057 * Use this call to set the current regulatory domain. Conflicts with
2058 * multiple drivers can be ironed out later. Caller must've already
2059 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
2061 int set_regdom(const struct ieee80211_regdomain
*rd
)
2065 assert_cfg80211_lock();
2067 /* Note that this doesn't update the wiphys, this is done below */
2068 r
= __set_regdom(rd
);
2074 /* This would make this whole thing pointless */
2075 if (!last_request
->intersect
)
2076 BUG_ON(rd
!= cfg80211_regdomain
);
2078 /* update all wiphys now with the new established regulatory domain */
2079 update_all_wiphy_regulatory(last_request
->initiator
);
2081 print_regdomain(cfg80211_regdomain
);
2086 /* Caller must hold cfg80211_mutex */
2087 void reg_device_remove(struct wiphy
*wiphy
)
2089 struct wiphy
*request_wiphy
;
2091 assert_cfg80211_lock();
2093 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
2096 if (!last_request
|| !request_wiphy
)
2098 if (request_wiphy
!= wiphy
)
2100 last_request
->wiphy_idx
= WIPHY_IDX_STALE
;
2101 last_request
->country_ie_env
= ENVIRON_ANY
;
2104 int regulatory_init(void)
2108 reg_pdev
= platform_device_register_simple("regulatory", 0, NULL
, 0);
2109 if (IS_ERR(reg_pdev
))
2110 return PTR_ERR(reg_pdev
);
2112 spin_lock_init(®_requests_lock
);
2113 spin_lock_init(®_pending_beacons_lock
);
2115 #ifdef CONFIG_WIRELESS_OLD_REGULATORY
2116 cfg80211_regdomain
= static_regdom(ieee80211_regdom
);
2118 printk(KERN_INFO
"cfg80211: Using static regulatory domain info\n");
2119 print_regdomain_info(cfg80211_regdomain
);
2121 * The old code still requests for a new regdomain and if
2122 * you have CRDA you get it updated, otherwise you get
2123 * stuck with the static values. We ignore "EU" code as
2124 * that is not a valid ISO / IEC 3166 alpha2
2126 if (ieee80211_regdom
[0] != 'E' || ieee80211_regdom
[1] != 'U')
2127 err
= regulatory_hint_core(ieee80211_regdom
);
2129 cfg80211_regdomain
= cfg80211_world_regdom
;
2131 err
= regulatory_hint_core("00");
2137 * N.B. kobject_uevent_env() can fail mainly for when we're out
2138 * memory which is handled and propagated appropriately above
2139 * but it can also fail during a netlink_broadcast() or during
2140 * early boot for call_usermodehelper(). For now treat these
2141 * errors as non-fatal.
2143 printk(KERN_ERR
"cfg80211: kobject_uevent_env() was unable "
2144 "to call CRDA during init");
2145 #ifdef CONFIG_CFG80211_REG_DEBUG
2146 /* We want to find out exactly why when debugging */
2154 void regulatory_exit(void)
2156 struct regulatory_request
*reg_request
, *tmp
;
2157 struct reg_beacon
*reg_beacon
, *btmp
;
2159 cancel_work_sync(®_work
);
2161 mutex_lock(&cfg80211_mutex
);
2165 kfree(country_ie_regdomain
);
2166 country_ie_regdomain
= NULL
;
2168 kfree(last_request
);
2170 platform_device_unregister(reg_pdev
);
2172 spin_lock_bh(®_pending_beacons_lock
);
2173 if (!list_empty(®_pending_beacons
)) {
2174 list_for_each_entry_safe(reg_beacon
, btmp
,
2175 ®_pending_beacons
, list
) {
2176 list_del(®_beacon
->list
);
2180 spin_unlock_bh(®_pending_beacons_lock
);
2182 if (!list_empty(®_beacon_list
)) {
2183 list_for_each_entry_safe(reg_beacon
, btmp
,
2184 ®_beacon_list
, list
) {
2185 list_del(®_beacon
->list
);
2190 spin_lock(®_requests_lock
);
2191 if (!list_empty(®_requests_list
)) {
2192 list_for_each_entry_safe(reg_request
, tmp
,
2193 ®_requests_list
, list
) {
2194 list_del(®_request
->list
);
2198 spin_unlock(®_requests_lock
);
2200 mutex_unlock(&cfg80211_mutex
);