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>
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 802.11b/g, channels 12..13. No HT40
95 * channel fits here. */
96 REG_RULE(2467-10, 2472+10, 20, 6, 20,
97 NL80211_RRF_PASSIVE_SCAN
|
99 /* IEEE 802.11 channel 14 - Only JP enables
100 * this and for 802.11b only */
101 REG_RULE(2484-10, 2484+10, 20, 6, 20,
102 NL80211_RRF_PASSIVE_SCAN
|
103 NL80211_RRF_NO_IBSS
|
104 NL80211_RRF_NO_OFDM
),
105 /* IEEE 802.11a, channel 36..48 */
106 REG_RULE(5180-10, 5240+10, 40, 6, 20,
107 NL80211_RRF_PASSIVE_SCAN
|
108 NL80211_RRF_NO_IBSS
),
110 /* NB: 5260 MHz - 5700 MHz requies DFS */
112 /* IEEE 802.11a, channel 149..165 */
113 REG_RULE(5745-10, 5825+10, 40, 6, 20,
114 NL80211_RRF_PASSIVE_SCAN
|
115 NL80211_RRF_NO_IBSS
),
119 static const struct ieee80211_regdomain
*cfg80211_world_regdom
=
122 #ifdef CONFIG_WIRELESS_OLD_REGULATORY
123 static char *ieee80211_regdom
= "US";
125 static char *ieee80211_regdom
= "00";
128 module_param(ieee80211_regdom
, charp
, 0444);
129 MODULE_PARM_DESC(ieee80211_regdom
, "IEEE 802.11 regulatory domain code");
131 #ifdef CONFIG_WIRELESS_OLD_REGULATORY
133 * We assume 40 MHz bandwidth for the old regulatory work.
134 * We make emphasis we are using the exact same frequencies
138 static const struct ieee80211_regdomain us_regdom
= {
142 /* IEEE 802.11b/g, channels 1..11 */
143 REG_RULE(2412-10, 2462+10, 40, 6, 27, 0),
144 /* IEEE 802.11a, channel 36 */
145 REG_RULE(5180-10, 5180+10, 40, 6, 23, 0),
146 /* IEEE 802.11a, channel 40 */
147 REG_RULE(5200-10, 5200+10, 40, 6, 23, 0),
148 /* IEEE 802.11a, channel 44 */
149 REG_RULE(5220-10, 5220+10, 40, 6, 23, 0),
150 /* IEEE 802.11a, channels 48..64 */
151 REG_RULE(5240-10, 5320+10, 40, 6, 23, 0),
152 /* IEEE 802.11a, channels 149..165, outdoor */
153 REG_RULE(5745-10, 5825+10, 40, 6, 30, 0),
157 static const struct ieee80211_regdomain jp_regdom
= {
161 /* IEEE 802.11b/g, channels 1..14 */
162 REG_RULE(2412-10, 2484+10, 40, 6, 20, 0),
163 /* IEEE 802.11a, channels 34..48 */
164 REG_RULE(5170-10, 5240+10, 40, 6, 20,
165 NL80211_RRF_PASSIVE_SCAN
),
166 /* IEEE 802.11a, channels 52..64 */
167 REG_RULE(5260-10, 5320+10, 40, 6, 20,
168 NL80211_RRF_NO_IBSS
|
173 static const struct ieee80211_regdomain eu_regdom
= {
176 * This alpha2 is bogus, we leave it here just for stupid
177 * backward compatibility
181 /* IEEE 802.11b/g, channels 1..13 */
182 REG_RULE(2412-10, 2472+10, 40, 6, 20, 0),
183 /* IEEE 802.11a, channel 36 */
184 REG_RULE(5180-10, 5180+10, 40, 6, 23,
185 NL80211_RRF_PASSIVE_SCAN
),
186 /* IEEE 802.11a, channel 40 */
187 REG_RULE(5200-10, 5200+10, 40, 6, 23,
188 NL80211_RRF_PASSIVE_SCAN
),
189 /* IEEE 802.11a, channel 44 */
190 REG_RULE(5220-10, 5220+10, 40, 6, 23,
191 NL80211_RRF_PASSIVE_SCAN
),
192 /* IEEE 802.11a, channels 48..64 */
193 REG_RULE(5240-10, 5320+10, 40, 6, 20,
194 NL80211_RRF_NO_IBSS
|
196 /* IEEE 802.11a, channels 100..140 */
197 REG_RULE(5500-10, 5700+10, 40, 6, 30,
198 NL80211_RRF_NO_IBSS
|
203 static const struct ieee80211_regdomain
*static_regdom(char *alpha2
)
205 if (alpha2
[0] == 'U' && alpha2
[1] == 'S')
207 if (alpha2
[0] == 'J' && alpha2
[1] == 'P')
209 if (alpha2
[0] == 'E' && alpha2
[1] == 'U')
211 /* Default, as per the old rules */
215 static bool is_old_static_regdom(const struct ieee80211_regdomain
*rd
)
217 if (rd
== &us_regdom
|| rd
== &jp_regdom
|| rd
== &eu_regdom
)
222 static inline bool is_old_static_regdom(const struct ieee80211_regdomain
*rd
)
228 static void reset_regdomains(void)
230 /* avoid freeing static information or freeing something twice */
231 if (cfg80211_regdomain
== cfg80211_world_regdom
)
232 cfg80211_regdomain
= NULL
;
233 if (cfg80211_world_regdom
== &world_regdom
)
234 cfg80211_world_regdom
= NULL
;
235 if (cfg80211_regdomain
== &world_regdom
)
236 cfg80211_regdomain
= NULL
;
237 if (is_old_static_regdom(cfg80211_regdomain
))
238 cfg80211_regdomain
= NULL
;
240 kfree(cfg80211_regdomain
);
241 kfree(cfg80211_world_regdom
);
243 cfg80211_world_regdom
= &world_regdom
;
244 cfg80211_regdomain
= NULL
;
248 * Dynamic world regulatory domain requested by the wireless
249 * core upon initialization
251 static void update_world_regdomain(const struct ieee80211_regdomain
*rd
)
253 BUG_ON(!last_request
);
257 cfg80211_world_regdom
= rd
;
258 cfg80211_regdomain
= rd
;
261 bool is_world_regdom(const char *alpha2
)
265 if (alpha2
[0] == '0' && alpha2
[1] == '0')
270 static bool is_alpha2_set(const char *alpha2
)
274 if (alpha2
[0] != 0 && alpha2
[1] != 0)
279 static bool is_alpha_upper(char letter
)
282 if (letter
>= 65 && letter
<= 90)
287 static bool is_unknown_alpha2(const char *alpha2
)
292 * Special case where regulatory domain was built by driver
293 * but a specific alpha2 cannot be determined
295 if (alpha2
[0] == '9' && alpha2
[1] == '9')
300 static bool is_intersected_alpha2(const char *alpha2
)
305 * Special case where regulatory domain is the
306 * result of an intersection between two regulatory domain
309 if (alpha2
[0] == '9' && alpha2
[1] == '8')
314 static bool is_an_alpha2(const char *alpha2
)
318 if (is_alpha_upper(alpha2
[0]) && is_alpha_upper(alpha2
[1]))
323 static bool alpha2_equal(const char *alpha2_x
, const char *alpha2_y
)
325 if (!alpha2_x
|| !alpha2_y
)
327 if (alpha2_x
[0] == alpha2_y
[0] &&
328 alpha2_x
[1] == alpha2_y
[1])
333 static bool regdom_changes(const char *alpha2
)
335 assert_cfg80211_lock();
337 if (!cfg80211_regdomain
)
339 if (alpha2_equal(cfg80211_regdomain
->alpha2
, alpha2
))
345 * country_ie_integrity_changes - tells us if the country IE has changed
346 * @checksum: checksum of country IE of fields we are interested in
348 * If the country IE has not changed you can ignore it safely. This is
349 * useful to determine if two devices are seeing two different country IEs
350 * even on the same alpha2. Note that this will return false if no IE has
351 * been set on the wireless core yet.
353 static bool country_ie_integrity_changes(u32 checksum
)
355 /* If no IE has been set then the checksum doesn't change */
356 if (unlikely(!last_request
->country_ie_checksum
))
358 if (unlikely(last_request
->country_ie_checksum
!= checksum
))
364 * This lets us keep regulatory code which is updated on a regulatory
365 * basis in userspace.
367 static int call_crda(const char *alpha2
)
369 char country_env
[9 + 2] = "COUNTRY=";
375 if (!is_world_regdom((char *) alpha2
))
376 printk(KERN_INFO
"cfg80211: Calling CRDA for country: %c%c\n",
377 alpha2
[0], alpha2
[1]);
379 printk(KERN_INFO
"cfg80211: Calling CRDA to update world "
380 "regulatory domain\n");
382 country_env
[8] = alpha2
[0];
383 country_env
[9] = alpha2
[1];
385 return kobject_uevent_env(®_pdev
->dev
.kobj
, KOBJ_CHANGE
, envp
);
388 /* Used by nl80211 before kmalloc'ing our regulatory domain */
389 bool reg_is_valid_request(const char *alpha2
)
394 return alpha2_equal(last_request
->alpha2
, alpha2
);
397 /* Sanity check on a regulatory rule */
398 static bool is_valid_reg_rule(const struct ieee80211_reg_rule
*rule
)
400 const struct ieee80211_freq_range
*freq_range
= &rule
->freq_range
;
403 if (freq_range
->start_freq_khz
<= 0 || freq_range
->end_freq_khz
<= 0)
406 if (freq_range
->start_freq_khz
> freq_range
->end_freq_khz
)
409 freq_diff
= freq_range
->end_freq_khz
- freq_range
->start_freq_khz
;
411 if (freq_range
->end_freq_khz
<= freq_range
->start_freq_khz
||
412 freq_range
->max_bandwidth_khz
> freq_diff
)
418 static bool is_valid_rd(const struct ieee80211_regdomain
*rd
)
420 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
423 if (!rd
->n_reg_rules
)
426 if (WARN_ON(rd
->n_reg_rules
> NL80211_MAX_SUPP_REG_RULES
))
429 for (i
= 0; i
< rd
->n_reg_rules
; i
++) {
430 reg_rule
= &rd
->reg_rules
[i
];
431 if (!is_valid_reg_rule(reg_rule
))
438 /* Returns value in KHz */
439 static u32
freq_max_bandwidth(const struct ieee80211_freq_range
*freq_range
,
443 for (i
= 0; i
< ARRAY_SIZE(supported_bandwidths
); i
++) {
444 u32 start_freq_khz
= freq
- supported_bandwidths
[i
]/2;
445 u32 end_freq_khz
= freq
+ supported_bandwidths
[i
]/2;
446 if (start_freq_khz
>= freq_range
->start_freq_khz
&&
447 end_freq_khz
<= freq_range
->end_freq_khz
)
448 return supported_bandwidths
[i
];
454 * freq_in_rule_band - tells us if a frequency is in a frequency band
455 * @freq_range: frequency rule we want to query
456 * @freq_khz: frequency we are inquiring about
458 * This lets us know if a specific frequency rule is or is not relevant to
459 * a specific frequency's band. Bands are device specific and artificial
460 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
461 * safe for now to assume that a frequency rule should not be part of a
462 * frequency's band if the start freq or end freq are off by more than 2 GHz.
463 * This resolution can be lowered and should be considered as we add
464 * regulatory rule support for other "bands".
466 static bool freq_in_rule_band(const struct ieee80211_freq_range
*freq_range
,
469 #define ONE_GHZ_IN_KHZ 1000000
470 if (abs(freq_khz
- freq_range
->start_freq_khz
) <= (2 * ONE_GHZ_IN_KHZ
))
472 if (abs(freq_khz
- freq_range
->end_freq_khz
) <= (2 * ONE_GHZ_IN_KHZ
))
475 #undef ONE_GHZ_IN_KHZ
479 * Converts a country IE to a regulatory domain. A regulatory domain
480 * structure has a lot of information which the IE doesn't yet have,
481 * so for the other values we use upper max values as we will intersect
482 * with our userspace regulatory agent to get lower bounds.
484 static struct ieee80211_regdomain
*country_ie_2_rd(
489 struct ieee80211_regdomain
*rd
= NULL
;
493 u32 num_rules
= 0, size_of_regd
= 0;
494 u8
*triplets_start
= NULL
;
495 u8 len_at_triplet
= 0;
496 /* the last channel we have registered in a subband (triplet) */
497 int last_sub_max_channel
= 0;
499 *checksum
= 0xDEADBEEF;
501 /* Country IE requirements */
502 BUG_ON(country_ie_len
< IEEE80211_COUNTRY_IE_MIN_LEN
||
503 country_ie_len
& 0x01);
505 alpha2
[0] = country_ie
[0];
506 alpha2
[1] = country_ie
[1];
509 * Third octet can be:
513 * anything else we assume is no restrictions
515 if (country_ie
[2] == 'I')
516 flags
= NL80211_RRF_NO_OUTDOOR
;
517 else if (country_ie
[2] == 'O')
518 flags
= NL80211_RRF_NO_INDOOR
;
523 triplets_start
= country_ie
;
524 len_at_triplet
= country_ie_len
;
526 *checksum
^= ((flags
^ alpha2
[0] ^ alpha2
[1]) << 8);
529 * We need to build a reg rule for each triplet, but first we must
530 * calculate the number of reg rules we will need. We will need one
531 * for each channel subband
533 while (country_ie_len
>= 3) {
535 struct ieee80211_country_ie_triplet
*triplet
=
536 (struct ieee80211_country_ie_triplet
*) country_ie
;
537 int cur_sub_max_channel
= 0, cur_channel
= 0;
539 if (triplet
->ext
.reg_extension_id
>=
540 IEEE80211_COUNTRY_EXTENSION_ID
) {
547 if (triplet
->chans
.first_channel
<= 14)
548 end_channel
= triplet
->chans
.first_channel
+
549 triplet
->chans
.num_channels
;
552 * 5 GHz -- For example in country IEs if the first
553 * channel given is 36 and the number of channels is 4
554 * then the individual channel numbers defined for the
555 * 5 GHz PHY by these parameters are: 36, 40, 44, and 48
556 * and not 36, 37, 38, 39.
558 * See: http://tinyurl.com/11d-clarification
560 end_channel
= triplet
->chans
.first_channel
+
561 (4 * (triplet
->chans
.num_channels
- 1));
563 cur_channel
= triplet
->chans
.first_channel
;
564 cur_sub_max_channel
= end_channel
;
566 /* Basic sanity check */
567 if (cur_sub_max_channel
< cur_channel
)
571 * Do not allow overlapping channels. Also channels
572 * passed in each subband must be monotonically
575 if (last_sub_max_channel
) {
576 if (cur_channel
<= last_sub_max_channel
)
578 if (cur_sub_max_channel
<= last_sub_max_channel
)
583 * When dot11RegulatoryClassesRequired is supported
584 * we can throw ext triplets as part of this soup,
585 * for now we don't care when those change as we
588 *checksum
^= ((cur_channel
^ cur_sub_max_channel
) << 8) |
589 ((cur_sub_max_channel
^ cur_sub_max_channel
) << 16) |
590 ((triplet
->chans
.max_power
^ cur_sub_max_channel
) << 24);
592 last_sub_max_channel
= cur_sub_max_channel
;
599 * Note: this is not a IEEE requirement but
600 * simply a memory requirement
602 if (num_rules
> NL80211_MAX_SUPP_REG_RULES
)
606 country_ie
= triplets_start
;
607 country_ie_len
= len_at_triplet
;
609 size_of_regd
= sizeof(struct ieee80211_regdomain
) +
610 (num_rules
* sizeof(struct ieee80211_reg_rule
));
612 rd
= kzalloc(size_of_regd
, GFP_KERNEL
);
616 rd
->n_reg_rules
= num_rules
;
617 rd
->alpha2
[0] = alpha2
[0];
618 rd
->alpha2
[1] = alpha2
[1];
620 /* This time around we fill in the rd */
621 while (country_ie_len
>= 3) {
623 struct ieee80211_country_ie_triplet
*triplet
=
624 (struct ieee80211_country_ie_triplet
*) country_ie
;
625 struct ieee80211_reg_rule
*reg_rule
= NULL
;
626 struct ieee80211_freq_range
*freq_range
= NULL
;
627 struct ieee80211_power_rule
*power_rule
= NULL
;
630 * Must parse if dot11RegulatoryClassesRequired is true,
631 * we don't support this yet
633 if (triplet
->ext
.reg_extension_id
>=
634 IEEE80211_COUNTRY_EXTENSION_ID
) {
640 reg_rule
= &rd
->reg_rules
[i
];
641 freq_range
= ®_rule
->freq_range
;
642 power_rule
= ®_rule
->power_rule
;
644 reg_rule
->flags
= flags
;
647 if (triplet
->chans
.first_channel
<= 14)
648 end_channel
= triplet
->chans
.first_channel
+
649 triplet
->chans
.num_channels
;
651 end_channel
= triplet
->chans
.first_channel
+
652 (4 * (triplet
->chans
.num_channels
- 1));
655 * The +10 is since the regulatory domain expects
656 * the actual band edge, not the center of freq for
657 * its start and end freqs, assuming 20 MHz bandwidth on
658 * the channels passed
660 freq_range
->start_freq_khz
=
661 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
662 triplet
->chans
.first_channel
) - 10);
663 freq_range
->end_freq_khz
=
664 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
668 * These are large arbitrary values we use to intersect later.
669 * Increment this if we ever support >= 40 MHz channels
672 freq_range
->max_bandwidth_khz
= MHZ_TO_KHZ(40);
673 power_rule
->max_antenna_gain
= DBI_TO_MBI(100);
674 power_rule
->max_eirp
= DBM_TO_MBM(100);
680 BUG_ON(i
> NL80211_MAX_SUPP_REG_RULES
);
688 * Helper for regdom_intersect(), this does the real
689 * mathematical intersection fun
691 static int reg_rules_intersect(
692 const struct ieee80211_reg_rule
*rule1
,
693 const struct ieee80211_reg_rule
*rule2
,
694 struct ieee80211_reg_rule
*intersected_rule
)
696 const struct ieee80211_freq_range
*freq_range1
, *freq_range2
;
697 struct ieee80211_freq_range
*freq_range
;
698 const struct ieee80211_power_rule
*power_rule1
, *power_rule2
;
699 struct ieee80211_power_rule
*power_rule
;
702 freq_range1
= &rule1
->freq_range
;
703 freq_range2
= &rule2
->freq_range
;
704 freq_range
= &intersected_rule
->freq_range
;
706 power_rule1
= &rule1
->power_rule
;
707 power_rule2
= &rule2
->power_rule
;
708 power_rule
= &intersected_rule
->power_rule
;
710 freq_range
->start_freq_khz
= max(freq_range1
->start_freq_khz
,
711 freq_range2
->start_freq_khz
);
712 freq_range
->end_freq_khz
= min(freq_range1
->end_freq_khz
,
713 freq_range2
->end_freq_khz
);
714 freq_range
->max_bandwidth_khz
= min(freq_range1
->max_bandwidth_khz
,
715 freq_range2
->max_bandwidth_khz
);
717 freq_diff
= freq_range
->end_freq_khz
- freq_range
->start_freq_khz
;
718 if (freq_range
->max_bandwidth_khz
> freq_diff
)
719 freq_range
->max_bandwidth_khz
= freq_diff
;
721 power_rule
->max_eirp
= min(power_rule1
->max_eirp
,
722 power_rule2
->max_eirp
);
723 power_rule
->max_antenna_gain
= min(power_rule1
->max_antenna_gain
,
724 power_rule2
->max_antenna_gain
);
726 intersected_rule
->flags
= (rule1
->flags
| rule2
->flags
);
728 if (!is_valid_reg_rule(intersected_rule
))
735 * regdom_intersect - do the intersection between two regulatory domains
736 * @rd1: first regulatory domain
737 * @rd2: second regulatory domain
739 * Use this function to get the intersection between two regulatory domains.
740 * Once completed we will mark the alpha2 for the rd as intersected, "98",
741 * as no one single alpha2 can represent this regulatory domain.
743 * Returns a pointer to the regulatory domain structure which will hold the
744 * resulting intersection of rules between rd1 and rd2. We will
745 * kzalloc() this structure for you.
747 static struct ieee80211_regdomain
*regdom_intersect(
748 const struct ieee80211_regdomain
*rd1
,
749 const struct ieee80211_regdomain
*rd2
)
753 unsigned int num_rules
= 0, rule_idx
= 0;
754 const struct ieee80211_reg_rule
*rule1
, *rule2
;
755 struct ieee80211_reg_rule
*intersected_rule
;
756 struct ieee80211_regdomain
*rd
;
757 /* This is just a dummy holder to help us count */
758 struct ieee80211_reg_rule irule
;
760 /* Uses the stack temporarily for counter arithmetic */
761 intersected_rule
= &irule
;
763 memset(intersected_rule
, 0, sizeof(struct ieee80211_reg_rule
));
769 * First we get a count of the rules we'll need, then we actually
770 * build them. This is to so we can malloc() and free() a
771 * regdomain once. The reason we use reg_rules_intersect() here
772 * is it will return -EINVAL if the rule computed makes no sense.
773 * All rules that do check out OK are valid.
776 for (x
= 0; x
< rd1
->n_reg_rules
; x
++) {
777 rule1
= &rd1
->reg_rules
[x
];
778 for (y
= 0; y
< rd2
->n_reg_rules
; y
++) {
779 rule2
= &rd2
->reg_rules
[y
];
780 if (!reg_rules_intersect(rule1
, rule2
,
783 memset(intersected_rule
, 0,
784 sizeof(struct ieee80211_reg_rule
));
791 size_of_regd
= sizeof(struct ieee80211_regdomain
) +
792 ((num_rules
+ 1) * sizeof(struct ieee80211_reg_rule
));
794 rd
= kzalloc(size_of_regd
, GFP_KERNEL
);
798 for (x
= 0; x
< rd1
->n_reg_rules
; x
++) {
799 rule1
= &rd1
->reg_rules
[x
];
800 for (y
= 0; y
< rd2
->n_reg_rules
; y
++) {
801 rule2
= &rd2
->reg_rules
[y
];
803 * This time around instead of using the stack lets
804 * write to the target rule directly saving ourselves
807 intersected_rule
= &rd
->reg_rules
[rule_idx
];
808 r
= reg_rules_intersect(rule1
, rule2
,
811 * No need to memset here the intersected rule here as
812 * we're not using the stack anymore
820 if (rule_idx
!= num_rules
) {
825 rd
->n_reg_rules
= num_rules
;
833 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
834 * want to just have the channel structure use these
836 static u32
map_regdom_flags(u32 rd_flags
)
838 u32 channel_flags
= 0;
839 if (rd_flags
& NL80211_RRF_PASSIVE_SCAN
)
840 channel_flags
|= IEEE80211_CHAN_PASSIVE_SCAN
;
841 if (rd_flags
& NL80211_RRF_NO_IBSS
)
842 channel_flags
|= IEEE80211_CHAN_NO_IBSS
;
843 if (rd_flags
& NL80211_RRF_DFS
)
844 channel_flags
|= IEEE80211_CHAN_RADAR
;
845 return channel_flags
;
848 static int freq_reg_info_regd(struct wiphy
*wiphy
,
851 const struct ieee80211_reg_rule
**reg_rule
,
852 const struct ieee80211_regdomain
*custom_regd
)
855 bool band_rule_found
= false;
856 const struct ieee80211_regdomain
*regd
;
857 u32 max_bandwidth
= 0;
859 regd
= custom_regd
? custom_regd
: cfg80211_regdomain
;
862 * Follow the driver's regulatory domain, if present, unless a country
863 * IE has been processed or a user wants to help complaince further
865 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
866 last_request
->initiator
!= NL80211_REGDOM_SET_BY_USER
&&
873 for (i
= 0; i
< regd
->n_reg_rules
; i
++) {
874 const struct ieee80211_reg_rule
*rr
;
875 const struct ieee80211_freq_range
*fr
= NULL
;
876 const struct ieee80211_power_rule
*pr
= NULL
;
878 rr
= ®d
->reg_rules
[i
];
879 fr
= &rr
->freq_range
;
880 pr
= &rr
->power_rule
;
883 * We only need to know if one frequency rule was
884 * was in center_freq's band, that's enough, so lets
885 * not overwrite it once found
887 if (!band_rule_found
)
888 band_rule_found
= freq_in_rule_band(fr
, center_freq
);
890 max_bandwidth
= freq_max_bandwidth(fr
, center_freq
);
892 if (max_bandwidth
&& *bandwidth
<= max_bandwidth
) {
894 *bandwidth
= max_bandwidth
;
899 if (!band_rule_found
)
902 return !max_bandwidth
;
904 EXPORT_SYMBOL(freq_reg_info
);
906 int freq_reg_info(struct wiphy
*wiphy
, u32 center_freq
, u32
*bandwidth
,
907 const struct ieee80211_reg_rule
**reg_rule
)
909 return freq_reg_info_regd(wiphy
, center_freq
,
910 bandwidth
, reg_rule
, NULL
);
913 static void handle_channel(struct wiphy
*wiphy
, enum ieee80211_band band
,
914 unsigned int chan_idx
)
918 u32 max_bandwidth
= 0;
919 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
920 const struct ieee80211_power_rule
*power_rule
= NULL
;
921 struct ieee80211_supported_band
*sband
;
922 struct ieee80211_channel
*chan
;
923 struct wiphy
*request_wiphy
= NULL
;
925 assert_cfg80211_lock();
927 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
929 sband
= wiphy
->bands
[band
];
930 BUG_ON(chan_idx
>= sband
->n_channels
);
931 chan
= &sband
->channels
[chan_idx
];
933 flags
= chan
->orig_flags
;
935 r
= freq_reg_info(wiphy
, MHZ_TO_KHZ(chan
->center_freq
),
936 &max_bandwidth
, ®_rule
);
940 * This means no regulatory rule was found in the country IE
941 * with a frequency range on the center_freq's band, since
942 * IEEE-802.11 allows for a country IE to have a subset of the
943 * regulatory information provided in a country we ignore
944 * disabling the channel unless at least one reg rule was
945 * found on the center_freq's band. For details see this
948 * http://tinyurl.com/11d-clarification
951 last_request
->initiator
==
952 NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
953 #ifdef CONFIG_CFG80211_REG_DEBUG
954 printk(KERN_DEBUG
"cfg80211: Leaving channel %d MHz "
955 "intact on %s - no rule found in band on "
957 chan
->center_freq
, wiphy_name(wiphy
));
961 * In this case we know the country IE has at least one reg rule
962 * for the band so we respect its band definitions
964 #ifdef CONFIG_CFG80211_REG_DEBUG
965 if (last_request
->initiator
==
966 NL80211_REGDOM_SET_BY_COUNTRY_IE
)
967 printk(KERN_DEBUG
"cfg80211: Disabling "
968 "channel %d MHz on %s due to "
970 chan
->center_freq
, wiphy_name(wiphy
));
972 flags
|= IEEE80211_CHAN_DISABLED
;
978 power_rule
= ®_rule
->power_rule
;
980 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
&&
981 request_wiphy
&& request_wiphy
== wiphy
&&
982 request_wiphy
->strict_regulatory
) {
984 * This gaurantees the driver's requested regulatory domain
985 * will always be used as a base for further regulatory
988 chan
->flags
= chan
->orig_flags
=
989 map_regdom_flags(reg_rule
->flags
);
990 chan
->max_antenna_gain
= chan
->orig_mag
=
991 (int) MBI_TO_DBI(power_rule
->max_antenna_gain
);
992 chan
->max_bandwidth
= KHZ_TO_MHZ(max_bandwidth
);
993 chan
->max_power
= chan
->orig_mpwr
=
994 (int) MBM_TO_DBM(power_rule
->max_eirp
);
998 chan
->flags
= flags
| map_regdom_flags(reg_rule
->flags
);
999 chan
->max_antenna_gain
= min(chan
->orig_mag
,
1000 (int) MBI_TO_DBI(power_rule
->max_antenna_gain
));
1001 chan
->max_bandwidth
= KHZ_TO_MHZ(max_bandwidth
);
1002 if (chan
->orig_mpwr
)
1003 chan
->max_power
= min(chan
->orig_mpwr
,
1004 (int) MBM_TO_DBM(power_rule
->max_eirp
));
1006 chan
->max_power
= (int) MBM_TO_DBM(power_rule
->max_eirp
);
1009 static void handle_band(struct wiphy
*wiphy
, enum ieee80211_band band
)
1012 struct ieee80211_supported_band
*sband
;
1014 BUG_ON(!wiphy
->bands
[band
]);
1015 sband
= wiphy
->bands
[band
];
1017 for (i
= 0; i
< sband
->n_channels
; i
++)
1018 handle_channel(wiphy
, band
, i
);
1021 static bool ignore_reg_update(struct wiphy
*wiphy
,
1022 enum nl80211_reg_initiator initiator
)
1026 if (initiator
== NL80211_REGDOM_SET_BY_CORE
&&
1027 wiphy
->custom_regulatory
)
1030 * wiphy->regd will be set once the device has its own
1031 * desired regulatory domain set
1033 if (wiphy
->strict_regulatory
&& !wiphy
->regd
&&
1034 !is_world_regdom(last_request
->alpha2
))
1039 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator
)
1041 struct cfg80211_registered_device
*drv
;
1043 list_for_each_entry(drv
, &cfg80211_drv_list
, list
)
1044 wiphy_update_regulatory(&drv
->wiphy
, initiator
);
1047 static void handle_reg_beacon(struct wiphy
*wiphy
,
1048 unsigned int chan_idx
,
1049 struct reg_beacon
*reg_beacon
)
1051 struct ieee80211_supported_band
*sband
;
1052 struct ieee80211_channel
*chan
;
1053 bool channel_changed
= false;
1054 struct ieee80211_channel chan_before
;
1056 assert_cfg80211_lock();
1058 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
1059 chan
= &sband
->channels
[chan_idx
];
1061 if (likely(chan
->center_freq
!= reg_beacon
->chan
.center_freq
))
1064 if (chan
->beacon_found
)
1067 chan
->beacon_found
= true;
1069 chan_before
.center_freq
= chan
->center_freq
;
1070 chan_before
.flags
= chan
->flags
;
1072 if ((chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
) &&
1073 !(chan
->orig_flags
& IEEE80211_CHAN_PASSIVE_SCAN
)) {
1074 chan
->flags
&= ~IEEE80211_CHAN_PASSIVE_SCAN
;
1075 channel_changed
= true;
1078 if ((chan
->flags
& IEEE80211_CHAN_NO_IBSS
) &&
1079 !(chan
->orig_flags
& IEEE80211_CHAN_NO_IBSS
)) {
1080 chan
->flags
&= ~IEEE80211_CHAN_NO_IBSS
;
1081 channel_changed
= true;
1084 if (channel_changed
)
1085 nl80211_send_beacon_hint_event(wiphy
, &chan_before
, chan
);
1089 * Called when a scan on a wiphy finds a beacon on
1092 static void wiphy_update_new_beacon(struct wiphy
*wiphy
,
1093 struct reg_beacon
*reg_beacon
)
1096 struct ieee80211_supported_band
*sband
;
1098 assert_cfg80211_lock();
1100 if (!wiphy
->bands
[reg_beacon
->chan
.band
])
1103 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 * Called upon reg changes or a new wiphy is added
1112 static void wiphy_update_beacon_reg(struct wiphy
*wiphy
)
1115 struct ieee80211_supported_band
*sband
;
1116 struct reg_beacon
*reg_beacon
;
1118 assert_cfg80211_lock();
1120 if (list_empty(®_beacon_list
))
1123 list_for_each_entry(reg_beacon
, ®_beacon_list
, list
) {
1124 if (!wiphy
->bands
[reg_beacon
->chan
.band
])
1126 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
1127 for (i
= 0; i
< sband
->n_channels
; i
++)
1128 handle_reg_beacon(wiphy
, i
, reg_beacon
);
1132 static bool reg_is_world_roaming(struct wiphy
*wiphy
)
1134 if (is_world_regdom(cfg80211_regdomain
->alpha2
) ||
1135 (wiphy
->regd
&& is_world_regdom(wiphy
->regd
->alpha2
)))
1137 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
1138 wiphy
->custom_regulatory
)
1143 /* Reap the advantages of previously found beacons */
1144 static void reg_process_beacons(struct wiphy
*wiphy
)
1146 if (!reg_is_world_roaming(wiphy
))
1148 wiphy_update_beacon_reg(wiphy
);
1151 void wiphy_update_regulatory(struct wiphy
*wiphy
,
1152 enum nl80211_reg_initiator initiator
)
1154 enum ieee80211_band band
;
1156 if (ignore_reg_update(wiphy
, initiator
))
1158 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
1159 if (wiphy
->bands
[band
])
1160 handle_band(wiphy
, band
);
1163 reg_process_beacons(wiphy
);
1164 if (wiphy
->reg_notifier
)
1165 wiphy
->reg_notifier(wiphy
, last_request
);
1168 static void handle_channel_custom(struct wiphy
*wiphy
,
1169 enum ieee80211_band band
,
1170 unsigned int chan_idx
,
1171 const struct ieee80211_regdomain
*regd
)
1174 u32 max_bandwidth
= 0;
1175 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
1176 const struct ieee80211_power_rule
*power_rule
= NULL
;
1177 struct ieee80211_supported_band
*sband
;
1178 struct ieee80211_channel
*chan
;
1180 sband
= wiphy
->bands
[band
];
1181 BUG_ON(chan_idx
>= sband
->n_channels
);
1182 chan
= &sband
->channels
[chan_idx
];
1184 r
= freq_reg_info_regd(wiphy
, MHZ_TO_KHZ(chan
->center_freq
),
1185 &max_bandwidth
, ®_rule
, regd
);
1188 chan
->flags
= IEEE80211_CHAN_DISABLED
;
1192 power_rule
= ®_rule
->power_rule
;
1194 chan
->flags
|= map_regdom_flags(reg_rule
->flags
);
1195 chan
->max_antenna_gain
= (int) MBI_TO_DBI(power_rule
->max_antenna_gain
);
1196 chan
->max_bandwidth
= KHZ_TO_MHZ(max_bandwidth
);
1197 chan
->max_power
= (int) MBM_TO_DBM(power_rule
->max_eirp
);
1200 static void handle_band_custom(struct wiphy
*wiphy
, enum ieee80211_band band
,
1201 const struct ieee80211_regdomain
*regd
)
1204 struct ieee80211_supported_band
*sband
;
1206 BUG_ON(!wiphy
->bands
[band
]);
1207 sband
= wiphy
->bands
[band
];
1209 for (i
= 0; i
< sband
->n_channels
; i
++)
1210 handle_channel_custom(wiphy
, band
, i
, regd
);
1213 /* Used by drivers prior to wiphy registration */
1214 void wiphy_apply_custom_regulatory(struct wiphy
*wiphy
,
1215 const struct ieee80211_regdomain
*regd
)
1217 enum ieee80211_band band
;
1218 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
1219 if (wiphy
->bands
[band
])
1220 handle_band_custom(wiphy
, band
, regd
);
1223 EXPORT_SYMBOL(wiphy_apply_custom_regulatory
);
1225 static int reg_copy_regd(const struct ieee80211_regdomain
**dst_regd
,
1226 const struct ieee80211_regdomain
*src_regd
)
1228 struct ieee80211_regdomain
*regd
;
1229 int size_of_regd
= 0;
1232 size_of_regd
= sizeof(struct ieee80211_regdomain
) +
1233 ((src_regd
->n_reg_rules
+ 1) * sizeof(struct ieee80211_reg_rule
));
1235 regd
= kzalloc(size_of_regd
, GFP_KERNEL
);
1239 memcpy(regd
, src_regd
, sizeof(struct ieee80211_regdomain
));
1241 for (i
= 0; i
< src_regd
->n_reg_rules
; i
++)
1242 memcpy(®d
->reg_rules
[i
], &src_regd
->reg_rules
[i
],
1243 sizeof(struct ieee80211_reg_rule
));
1250 * Return value which can be used by ignore_request() to indicate
1251 * it has been determined we should intersect two regulatory domains
1253 #define REG_INTERSECT 1
1255 /* This has the logic which determines when a new request
1256 * should be ignored. */
1257 static int ignore_request(struct wiphy
*wiphy
,
1258 struct regulatory_request
*pending_request
)
1260 struct wiphy
*last_wiphy
= NULL
;
1262 assert_cfg80211_lock();
1264 /* All initial requests are respected */
1268 switch (pending_request
->initiator
) {
1269 case NL80211_REGDOM_SET_BY_CORE
:
1271 case NL80211_REGDOM_SET_BY_COUNTRY_IE
:
1273 last_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
1275 if (unlikely(!is_an_alpha2(pending_request
->alpha2
)))
1277 if (last_request
->initiator
==
1278 NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
1279 if (last_wiphy
!= wiphy
) {
1281 * Two cards with two APs claiming different
1282 * different Country IE alpha2s. We could
1283 * intersect them, but that seems unlikely
1284 * to be correct. Reject second one for now.
1286 if (regdom_changes(pending_request
->alpha2
))
1291 * Two consecutive Country IE hints on the same wiphy.
1292 * This should be picked up early by the driver/stack
1294 if (WARN_ON(regdom_changes(pending_request
->alpha2
)))
1298 return REG_INTERSECT
;
1299 case NL80211_REGDOM_SET_BY_DRIVER
:
1300 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_CORE
) {
1301 if (is_old_static_regdom(cfg80211_regdomain
))
1303 if (regdom_changes(pending_request
->alpha2
))
1309 * This would happen if you unplug and plug your card
1310 * back in or if you add a new device for which the previously
1311 * loaded card also agrees on the regulatory domain.
1313 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
&&
1314 !regdom_changes(pending_request
->alpha2
))
1317 return REG_INTERSECT
;
1318 case NL80211_REGDOM_SET_BY_USER
:
1319 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_COUNTRY_IE
)
1320 return REG_INTERSECT
;
1322 * If the user knows better the user should set the regdom
1323 * to their country before the IE is picked up
1325 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_USER
&&
1326 last_request
->intersect
)
1329 * Process user requests only after previous user/driver/core
1330 * requests have been processed
1332 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_CORE
||
1333 last_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
||
1334 last_request
->initiator
== NL80211_REGDOM_SET_BY_USER
) {
1335 if (regdom_changes(last_request
->alpha2
))
1339 if (!is_old_static_regdom(cfg80211_regdomain
) &&
1340 !regdom_changes(pending_request
->alpha2
))
1350 * __regulatory_hint - hint to the wireless core a regulatory domain
1351 * @wiphy: if the hint comes from country information from an AP, this
1352 * is required to be set to the wiphy that received the information
1353 * @pending_request: the regulatory request currently being processed
1355 * The Wireless subsystem can use this function to hint to the wireless core
1356 * what it believes should be the current regulatory domain.
1358 * Returns zero if all went fine, %-EALREADY if a regulatory domain had
1359 * already been set or other standard error codes.
1361 * Caller must hold &cfg80211_mutex
1363 static int __regulatory_hint(struct wiphy
*wiphy
,
1364 struct regulatory_request
*pending_request
)
1366 bool intersect
= false;
1369 assert_cfg80211_lock();
1371 r
= ignore_request(wiphy
, pending_request
);
1373 if (r
== REG_INTERSECT
) {
1374 if (pending_request
->initiator
==
1375 NL80211_REGDOM_SET_BY_DRIVER
) {
1376 r
= reg_copy_regd(&wiphy
->regd
, cfg80211_regdomain
);
1378 kfree(pending_request
);
1385 * If the regulatory domain being requested by the
1386 * driver has already been set just copy it to the
1389 if (r
== -EALREADY
&&
1390 pending_request
->initiator
==
1391 NL80211_REGDOM_SET_BY_DRIVER
) {
1392 r
= reg_copy_regd(&wiphy
->regd
, cfg80211_regdomain
);
1394 kfree(pending_request
);
1400 kfree(pending_request
);
1405 kfree(last_request
);
1407 last_request
= pending_request
;
1408 last_request
->intersect
= intersect
;
1410 pending_request
= NULL
;
1412 /* When r == REG_INTERSECT we do need to call CRDA */
1415 * Since CRDA will not be called in this case as we already
1416 * have applied the requested regulatory domain before we just
1417 * inform userspace we have processed the request
1420 nl80211_send_reg_change_event(last_request
);
1424 return call_crda(last_request
->alpha2
);
1427 /* This currently only processes user and driver regulatory hints */
1428 static void reg_process_hint(struct regulatory_request
*reg_request
)
1431 struct wiphy
*wiphy
= NULL
;
1433 BUG_ON(!reg_request
->alpha2
);
1435 mutex_lock(&cfg80211_mutex
);
1437 if (wiphy_idx_valid(reg_request
->wiphy_idx
))
1438 wiphy
= wiphy_idx_to_wiphy(reg_request
->wiphy_idx
);
1440 if (reg_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
&&
1446 r
= __regulatory_hint(wiphy
, reg_request
);
1447 /* This is required so that the orig_* parameters are saved */
1448 if (r
== -EALREADY
&& wiphy
&& wiphy
->strict_regulatory
)
1449 wiphy_update_regulatory(wiphy
, reg_request
->initiator
);
1451 mutex_unlock(&cfg80211_mutex
);
1454 /* Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* */
1455 static void reg_process_pending_hints(void)
1457 struct regulatory_request
*reg_request
;
1459 spin_lock(®_requests_lock
);
1460 while (!list_empty(®_requests_list
)) {
1461 reg_request
= list_first_entry(®_requests_list
,
1462 struct regulatory_request
,
1464 list_del_init(®_request
->list
);
1466 spin_unlock(®_requests_lock
);
1467 reg_process_hint(reg_request
);
1468 spin_lock(®_requests_lock
);
1470 spin_unlock(®_requests_lock
);
1473 /* Processes beacon hints -- this has nothing to do with country IEs */
1474 static void reg_process_pending_beacon_hints(void)
1476 struct cfg80211_registered_device
*drv
;
1477 struct reg_beacon
*pending_beacon
, *tmp
;
1479 mutex_lock(&cfg80211_mutex
);
1481 /* This goes through the _pending_ beacon list */
1482 spin_lock_bh(®_pending_beacons_lock
);
1484 if (list_empty(®_pending_beacons
)) {
1485 spin_unlock_bh(®_pending_beacons_lock
);
1489 list_for_each_entry_safe(pending_beacon
, tmp
,
1490 ®_pending_beacons
, list
) {
1492 list_del_init(&pending_beacon
->list
);
1494 /* Applies the beacon hint to current wiphys */
1495 list_for_each_entry(drv
, &cfg80211_drv_list
, list
)
1496 wiphy_update_new_beacon(&drv
->wiphy
, pending_beacon
);
1498 /* Remembers the beacon hint for new wiphys or reg changes */
1499 list_add_tail(&pending_beacon
->list
, ®_beacon_list
);
1502 spin_unlock_bh(®_pending_beacons_lock
);
1504 mutex_unlock(&cfg80211_mutex
);
1507 static void reg_todo(struct work_struct
*work
)
1509 reg_process_pending_hints();
1510 reg_process_pending_beacon_hints();
1513 static DECLARE_WORK(reg_work
, reg_todo
);
1515 static void queue_regulatory_request(struct regulatory_request
*request
)
1517 spin_lock(®_requests_lock
);
1518 list_add_tail(&request
->list
, ®_requests_list
);
1519 spin_unlock(®_requests_lock
);
1521 schedule_work(®_work
);
1524 /* Core regulatory hint -- happens once during cfg80211_init() */
1525 static int regulatory_hint_core(const char *alpha2
)
1527 struct regulatory_request
*request
;
1529 BUG_ON(last_request
);
1531 request
= kzalloc(sizeof(struct regulatory_request
),
1536 request
->alpha2
[0] = alpha2
[0];
1537 request
->alpha2
[1] = alpha2
[1];
1538 request
->initiator
= NL80211_REGDOM_SET_BY_CORE
;
1540 queue_regulatory_request(request
);
1546 int regulatory_hint_user(const char *alpha2
)
1548 struct regulatory_request
*request
;
1552 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
1556 request
->wiphy_idx
= WIPHY_IDX_STALE
;
1557 request
->alpha2
[0] = alpha2
[0];
1558 request
->alpha2
[1] = alpha2
[1];
1559 request
->initiator
= NL80211_REGDOM_SET_BY_USER
,
1561 queue_regulatory_request(request
);
1567 int regulatory_hint(struct wiphy
*wiphy
, const char *alpha2
)
1569 struct regulatory_request
*request
;
1574 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
1578 request
->wiphy_idx
= get_wiphy_idx(wiphy
);
1580 /* Must have registered wiphy first */
1581 BUG_ON(!wiphy_idx_valid(request
->wiphy_idx
));
1583 request
->alpha2
[0] = alpha2
[0];
1584 request
->alpha2
[1] = alpha2
[1];
1585 request
->initiator
= NL80211_REGDOM_SET_BY_DRIVER
;
1587 queue_regulatory_request(request
);
1591 EXPORT_SYMBOL(regulatory_hint
);
1593 static bool reg_same_country_ie_hint(struct wiphy
*wiphy
,
1594 u32 country_ie_checksum
)
1596 struct wiphy
*request_wiphy
;
1598 assert_cfg80211_lock();
1600 if (unlikely(last_request
->initiator
!=
1601 NL80211_REGDOM_SET_BY_COUNTRY_IE
))
1604 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
1609 if (likely(request_wiphy
!= wiphy
))
1610 return !country_ie_integrity_changes(country_ie_checksum
);
1612 * We should not have let these through at this point, they
1613 * should have been picked up earlier by the first alpha2 check
1616 if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum
)))
1621 void regulatory_hint_11d(struct wiphy
*wiphy
,
1625 struct ieee80211_regdomain
*rd
= NULL
;
1628 enum environment_cap env
= ENVIRON_ANY
;
1629 struct regulatory_request
*request
;
1631 mutex_lock(&cfg80211_mutex
);
1633 if (unlikely(!last_request
)) {
1634 mutex_unlock(&cfg80211_mutex
);
1638 /* IE len must be evenly divisible by 2 */
1639 if (country_ie_len
& 0x01)
1642 if (country_ie_len
< IEEE80211_COUNTRY_IE_MIN_LEN
)
1646 * Pending country IE processing, this can happen after we
1647 * call CRDA and wait for a response if a beacon was received before
1648 * we were able to process the last regulatory_hint_11d() call
1650 if (country_ie_regdomain
)
1653 alpha2
[0] = country_ie
[0];
1654 alpha2
[1] = country_ie
[1];
1656 if (country_ie
[2] == 'I')
1657 env
= ENVIRON_INDOOR
;
1658 else if (country_ie
[2] == 'O')
1659 env
= ENVIRON_OUTDOOR
;
1662 * We will run this for *every* beacon processed for the BSSID, so
1663 * we optimize an early check to exit out early if we don't have to
1666 if (likely(last_request
->initiator
==
1667 NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
1668 wiphy_idx_valid(last_request
->wiphy_idx
))) {
1669 struct cfg80211_registered_device
*drv_last_ie
;
1672 cfg80211_drv_by_wiphy_idx(last_request
->wiphy_idx
);
1675 * Lets keep this simple -- we trust the first AP
1676 * after we intersect with CRDA
1678 if (likely(&drv_last_ie
->wiphy
== wiphy
)) {
1680 * Ignore IEs coming in on this wiphy with
1681 * the same alpha2 and environment cap
1683 if (likely(alpha2_equal(drv_last_ie
->country_ie_alpha2
,
1685 env
== drv_last_ie
->env
)) {
1689 * the wiphy moved on to another BSSID or the AP
1690 * was reconfigured. XXX: We need to deal with the
1691 * case where the user suspends and goes to goes
1692 * to another country, and then gets IEs from an
1693 * AP with different settings
1698 * Ignore IEs coming in on two separate wiphys with
1699 * the same alpha2 and environment cap
1701 if (likely(alpha2_equal(drv_last_ie
->country_ie_alpha2
,
1703 env
== drv_last_ie
->env
)) {
1706 /* We could potentially intersect though */
1711 rd
= country_ie_2_rd(country_ie
, country_ie_len
, &checksum
);
1716 * This will not happen right now but we leave it here for the
1717 * the future when we want to add suspend/resume support and having
1718 * the user move to another country after doing so, or having the user
1719 * move to another AP. Right now we just trust the first AP.
1721 * If we hit this before we add this support we want to be informed of
1722 * it as it would indicate a mistake in the current design
1724 if (WARN_ON(reg_same_country_ie_hint(wiphy
, checksum
)))
1727 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
1732 * We keep this around for when CRDA comes back with a response so
1733 * we can intersect with that
1735 country_ie_regdomain
= rd
;
1737 request
->wiphy_idx
= get_wiphy_idx(wiphy
);
1738 request
->alpha2
[0] = rd
->alpha2
[0];
1739 request
->alpha2
[1] = rd
->alpha2
[1];
1740 request
->initiator
= NL80211_REGDOM_SET_BY_COUNTRY_IE
;
1741 request
->country_ie_checksum
= checksum
;
1742 request
->country_ie_env
= env
;
1744 mutex_unlock(&cfg80211_mutex
);
1746 queue_regulatory_request(request
);
1753 mutex_unlock(&cfg80211_mutex
);
1755 EXPORT_SYMBOL(regulatory_hint_11d
);
1757 static bool freq_is_chan_12_13_14(u16 freq
)
1759 if (freq
== ieee80211_channel_to_frequency(12) ||
1760 freq
== ieee80211_channel_to_frequency(13) ||
1761 freq
== ieee80211_channel_to_frequency(14))
1766 int regulatory_hint_found_beacon(struct wiphy
*wiphy
,
1767 struct ieee80211_channel
*beacon_chan
,
1770 struct reg_beacon
*reg_beacon
;
1772 if (likely((beacon_chan
->beacon_found
||
1773 (beacon_chan
->flags
& IEEE80211_CHAN_RADAR
) ||
1774 (beacon_chan
->band
== IEEE80211_BAND_2GHZ
&&
1775 !freq_is_chan_12_13_14(beacon_chan
->center_freq
)))))
1778 reg_beacon
= kzalloc(sizeof(struct reg_beacon
), gfp
);
1782 #ifdef CONFIG_CFG80211_REG_DEBUG
1783 printk(KERN_DEBUG
"cfg80211: Found new beacon on "
1784 "frequency: %d MHz (Ch %d) on %s\n",
1785 beacon_chan
->center_freq
,
1786 ieee80211_frequency_to_channel(beacon_chan
->center_freq
),
1789 memcpy(®_beacon
->chan
, beacon_chan
,
1790 sizeof(struct ieee80211_channel
));
1794 * Since we can be called from BH or and non-BH context
1795 * we must use spin_lock_bh()
1797 spin_lock_bh(®_pending_beacons_lock
);
1798 list_add_tail(®_beacon
->list
, ®_pending_beacons
);
1799 spin_unlock_bh(®_pending_beacons_lock
);
1801 schedule_work(®_work
);
1806 static void print_rd_rules(const struct ieee80211_regdomain
*rd
)
1809 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
1810 const struct ieee80211_freq_range
*freq_range
= NULL
;
1811 const struct ieee80211_power_rule
*power_rule
= NULL
;
1813 printk(KERN_INFO
"\t(start_freq - end_freq @ bandwidth), "
1814 "(max_antenna_gain, max_eirp)\n");
1816 for (i
= 0; i
< rd
->n_reg_rules
; i
++) {
1817 reg_rule
= &rd
->reg_rules
[i
];
1818 freq_range
= ®_rule
->freq_range
;
1819 power_rule
= ®_rule
->power_rule
;
1822 * There may not be documentation for max antenna gain
1823 * in certain regions
1825 if (power_rule
->max_antenna_gain
)
1826 printk(KERN_INFO
"\t(%d KHz - %d KHz @ %d KHz), "
1827 "(%d mBi, %d mBm)\n",
1828 freq_range
->start_freq_khz
,
1829 freq_range
->end_freq_khz
,
1830 freq_range
->max_bandwidth_khz
,
1831 power_rule
->max_antenna_gain
,
1832 power_rule
->max_eirp
);
1834 printk(KERN_INFO
"\t(%d KHz - %d KHz @ %d KHz), "
1836 freq_range
->start_freq_khz
,
1837 freq_range
->end_freq_khz
,
1838 freq_range
->max_bandwidth_khz
,
1839 power_rule
->max_eirp
);
1843 static void print_regdomain(const struct ieee80211_regdomain
*rd
)
1846 if (is_intersected_alpha2(rd
->alpha2
)) {
1848 if (last_request
->initiator
==
1849 NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
1850 struct cfg80211_registered_device
*drv
;
1851 drv
= cfg80211_drv_by_wiphy_idx(
1852 last_request
->wiphy_idx
);
1854 printk(KERN_INFO
"cfg80211: Current regulatory "
1855 "domain updated by AP to: %c%c\n",
1856 drv
->country_ie_alpha2
[0],
1857 drv
->country_ie_alpha2
[1]);
1859 printk(KERN_INFO
"cfg80211: Current regulatory "
1860 "domain intersected: \n");
1862 printk(KERN_INFO
"cfg80211: Current regulatory "
1863 "domain intersected: \n");
1864 } else if (is_world_regdom(rd
->alpha2
))
1865 printk(KERN_INFO
"cfg80211: World regulatory "
1866 "domain updated:\n");
1868 if (is_unknown_alpha2(rd
->alpha2
))
1869 printk(KERN_INFO
"cfg80211: Regulatory domain "
1870 "changed to driver built-in settings "
1871 "(unknown country)\n");
1873 printk(KERN_INFO
"cfg80211: Regulatory domain "
1874 "changed to country: %c%c\n",
1875 rd
->alpha2
[0], rd
->alpha2
[1]);
1880 static void print_regdomain_info(const struct ieee80211_regdomain
*rd
)
1882 printk(KERN_INFO
"cfg80211: Regulatory domain: %c%c\n",
1883 rd
->alpha2
[0], rd
->alpha2
[1]);
1887 #ifdef CONFIG_CFG80211_REG_DEBUG
1888 static void reg_country_ie_process_debug(
1889 const struct ieee80211_regdomain
*rd
,
1890 const struct ieee80211_regdomain
*country_ie_regdomain
,
1891 const struct ieee80211_regdomain
*intersected_rd
)
1893 printk(KERN_DEBUG
"cfg80211: Received country IE:\n");
1894 print_regdomain_info(country_ie_regdomain
);
1895 printk(KERN_DEBUG
"cfg80211: CRDA thinks this should applied:\n");
1896 print_regdomain_info(rd
);
1897 if (intersected_rd
) {
1898 printk(KERN_DEBUG
"cfg80211: We intersect both of these "
1900 print_regdomain_info(intersected_rd
);
1903 printk(KERN_DEBUG
"cfg80211: Intersection between both failed\n");
1906 static inline void reg_country_ie_process_debug(
1907 const struct ieee80211_regdomain
*rd
,
1908 const struct ieee80211_regdomain
*country_ie_regdomain
,
1909 const struct ieee80211_regdomain
*intersected_rd
)
1914 /* Takes ownership of rd only if it doesn't fail */
1915 static int __set_regdom(const struct ieee80211_regdomain
*rd
)
1917 const struct ieee80211_regdomain
*intersected_rd
= NULL
;
1918 struct cfg80211_registered_device
*drv
= NULL
;
1919 struct wiphy
*request_wiphy
;
1920 /* Some basic sanity checks first */
1922 if (is_world_regdom(rd
->alpha2
)) {
1923 if (WARN_ON(!reg_is_valid_request(rd
->alpha2
)))
1925 update_world_regdomain(rd
);
1929 if (!is_alpha2_set(rd
->alpha2
) && !is_an_alpha2(rd
->alpha2
) &&
1930 !is_unknown_alpha2(rd
->alpha2
))
1937 * Lets only bother proceeding on the same alpha2 if the current
1938 * rd is non static (it means CRDA was present and was used last)
1939 * and the pending request came in from a country IE
1941 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
1943 * If someone else asked us to change the rd lets only bother
1944 * checking if the alpha2 changes if CRDA was already called
1946 if (!is_old_static_regdom(cfg80211_regdomain
) &&
1947 !regdom_changes(rd
->alpha2
))
1952 * Now lets set the regulatory domain, update all driver channels
1953 * and finally inform them of what we have done, in case they want
1954 * to review or adjust their own settings based on their own
1955 * internal EEPROM data
1958 if (WARN_ON(!reg_is_valid_request(rd
->alpha2
)))
1961 if (!is_valid_rd(rd
)) {
1962 printk(KERN_ERR
"cfg80211: Invalid "
1963 "regulatory domain detected:\n");
1964 print_regdomain_info(rd
);
1968 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
1970 if (!last_request
->intersect
) {
1973 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_DRIVER
) {
1975 cfg80211_regdomain
= rd
;
1980 * For a driver hint, lets copy the regulatory domain the
1981 * driver wanted to the wiphy to deal with conflicts
1984 BUG_ON(request_wiphy
->regd
);
1986 r
= reg_copy_regd(&request_wiphy
->regd
, rd
);
1991 cfg80211_regdomain
= rd
;
1995 /* Intersection requires a bit more work */
1997 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
1999 intersected_rd
= regdom_intersect(rd
, cfg80211_regdomain
);
2000 if (!intersected_rd
)
2004 * We can trash what CRDA provided now.
2005 * However if a driver requested this specific regulatory
2006 * domain we keep it for its private use
2008 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
)
2009 request_wiphy
->regd
= rd
;
2016 cfg80211_regdomain
= intersected_rd
;
2022 * Country IE requests are handled a bit differently, we intersect
2023 * the country IE rd with what CRDA believes that country should have
2026 BUG_ON(!country_ie_regdomain
);
2027 BUG_ON(rd
== country_ie_regdomain
);
2030 * Intersect what CRDA returned and our what we
2031 * had built from the Country IE received
2034 intersected_rd
= regdom_intersect(rd
, country_ie_regdomain
);
2036 reg_country_ie_process_debug(rd
,
2037 country_ie_regdomain
,
2040 kfree(country_ie_regdomain
);
2041 country_ie_regdomain
= NULL
;
2043 if (!intersected_rd
)
2046 drv
= wiphy_to_dev(request_wiphy
);
2048 drv
->country_ie_alpha2
[0] = rd
->alpha2
[0];
2049 drv
->country_ie_alpha2
[1] = rd
->alpha2
[1];
2050 drv
->env
= last_request
->country_ie_env
;
2052 BUG_ON(intersected_rd
== rd
);
2058 cfg80211_regdomain
= intersected_rd
;
2065 * Use this call to set the current regulatory domain. Conflicts with
2066 * multiple drivers can be ironed out later. Caller must've already
2067 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
2069 int set_regdom(const struct ieee80211_regdomain
*rd
)
2073 assert_cfg80211_lock();
2075 /* Note that this doesn't update the wiphys, this is done below */
2076 r
= __set_regdom(rd
);
2082 /* This would make this whole thing pointless */
2083 if (!last_request
->intersect
)
2084 BUG_ON(rd
!= cfg80211_regdomain
);
2086 /* update all wiphys now with the new established regulatory domain */
2087 update_all_wiphy_regulatory(last_request
->initiator
);
2089 print_regdomain(cfg80211_regdomain
);
2091 nl80211_send_reg_change_event(last_request
);
2096 /* Caller must hold cfg80211_mutex */
2097 void reg_device_remove(struct wiphy
*wiphy
)
2099 struct wiphy
*request_wiphy
= NULL
;
2101 assert_cfg80211_lock();
2106 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
2108 if (!request_wiphy
|| request_wiphy
!= wiphy
)
2111 last_request
->wiphy_idx
= WIPHY_IDX_STALE
;
2112 last_request
->country_ie_env
= ENVIRON_ANY
;
2115 int regulatory_init(void)
2119 reg_pdev
= platform_device_register_simple("regulatory", 0, NULL
, 0);
2120 if (IS_ERR(reg_pdev
))
2121 return PTR_ERR(reg_pdev
);
2123 spin_lock_init(®_requests_lock
);
2124 spin_lock_init(®_pending_beacons_lock
);
2126 #ifdef CONFIG_WIRELESS_OLD_REGULATORY
2127 cfg80211_regdomain
= static_regdom(ieee80211_regdom
);
2129 printk(KERN_INFO
"cfg80211: Using static regulatory domain info\n");
2130 print_regdomain_info(cfg80211_regdomain
);
2132 * The old code still requests for a new regdomain and if
2133 * you have CRDA you get it updated, otherwise you get
2134 * stuck with the static values. Since "EU" is not a valid
2135 * ISO / IEC 3166 alpha2 code we can't expect userpace to
2136 * give us a regulatory domain for it. We need last_request
2137 * iniitalized though so lets just send a request which we
2138 * know will be ignored... this crap will be removed once
2141 err
= regulatory_hint_core(ieee80211_regdom
);
2143 cfg80211_regdomain
= cfg80211_world_regdom
;
2145 err
= regulatory_hint_core(ieee80211_regdom
);
2151 * N.B. kobject_uevent_env() can fail mainly for when we're out
2152 * memory which is handled and propagated appropriately above
2153 * but it can also fail during a netlink_broadcast() or during
2154 * early boot for call_usermodehelper(). For now treat these
2155 * errors as non-fatal.
2157 printk(KERN_ERR
"cfg80211: kobject_uevent_env() was unable "
2158 "to call CRDA during init");
2159 #ifdef CONFIG_CFG80211_REG_DEBUG
2160 /* We want to find out exactly why when debugging */
2168 void regulatory_exit(void)
2170 struct regulatory_request
*reg_request
, *tmp
;
2171 struct reg_beacon
*reg_beacon
, *btmp
;
2173 cancel_work_sync(®_work
);
2175 mutex_lock(&cfg80211_mutex
);
2179 kfree(country_ie_regdomain
);
2180 country_ie_regdomain
= NULL
;
2182 kfree(last_request
);
2184 platform_device_unregister(reg_pdev
);
2186 spin_lock_bh(®_pending_beacons_lock
);
2187 if (!list_empty(®_pending_beacons
)) {
2188 list_for_each_entry_safe(reg_beacon
, btmp
,
2189 ®_pending_beacons
, list
) {
2190 list_del(®_beacon
->list
);
2194 spin_unlock_bh(®_pending_beacons_lock
);
2196 if (!list_empty(®_beacon_list
)) {
2197 list_for_each_entry_safe(reg_beacon
, btmp
,
2198 ®_beacon_list
, list
) {
2199 list_del(®_beacon
->list
);
2204 spin_lock(®_requests_lock
);
2205 if (!list_empty(®_requests_list
)) {
2206 list_for_each_entry_safe(reg_request
, tmp
,
2207 ®_requests_list
, list
) {
2208 list_del(®_request
->list
);
2212 spin_unlock(®_requests_lock
);
2214 mutex_unlock(&cfg80211_mutex
);