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 802.11b/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";
124 module_param(ieee80211_regdom
, charp
, 0444);
125 MODULE_PARM_DESC(ieee80211_regdom
, "IEEE 802.11 regulatory domain code");
128 * We assume 40 MHz bandwidth for the old regulatory work.
129 * We make emphasis we are using the exact same frequencies
133 static const struct ieee80211_regdomain us_regdom
= {
137 /* IEEE 802.11b/g, channels 1..11 */
138 REG_RULE(2412-10, 2462+10, 40, 6, 27, 0),
139 /* IEEE 802.11a, channel 36 */
140 REG_RULE(5180-10, 5180+10, 40, 6, 23, 0),
141 /* IEEE 802.11a, channel 40 */
142 REG_RULE(5200-10, 5200+10, 40, 6, 23, 0),
143 /* IEEE 802.11a, channel 44 */
144 REG_RULE(5220-10, 5220+10, 40, 6, 23, 0),
145 /* IEEE 802.11a, channels 48..64 */
146 REG_RULE(5240-10, 5320+10, 40, 6, 23, 0),
147 /* IEEE 802.11a, channels 149..165, outdoor */
148 REG_RULE(5745-10, 5825+10, 40, 6, 30, 0),
152 static const struct ieee80211_regdomain jp_regdom
= {
156 /* IEEE 802.11b/g, channels 1..14 */
157 REG_RULE(2412-10, 2484+10, 40, 6, 20, 0),
158 /* IEEE 802.11a, channels 34..48 */
159 REG_RULE(5170-10, 5240+10, 40, 6, 20,
160 NL80211_RRF_PASSIVE_SCAN
),
161 /* IEEE 802.11a, channels 52..64 */
162 REG_RULE(5260-10, 5320+10, 40, 6, 20,
163 NL80211_RRF_NO_IBSS
|
168 static const struct ieee80211_regdomain eu_regdom
= {
171 * This alpha2 is bogus, we leave it here just for stupid
172 * backward compatibility
176 /* IEEE 802.11b/g, channels 1..13 */
177 REG_RULE(2412-10, 2472+10, 40, 6, 20, 0),
178 /* IEEE 802.11a, channel 36 */
179 REG_RULE(5180-10, 5180+10, 40, 6, 23,
180 NL80211_RRF_PASSIVE_SCAN
),
181 /* IEEE 802.11a, channel 40 */
182 REG_RULE(5200-10, 5200+10, 40, 6, 23,
183 NL80211_RRF_PASSIVE_SCAN
),
184 /* IEEE 802.11a, channel 44 */
185 REG_RULE(5220-10, 5220+10, 40, 6, 23,
186 NL80211_RRF_PASSIVE_SCAN
),
187 /* IEEE 802.11a, channels 48..64 */
188 REG_RULE(5240-10, 5320+10, 40, 6, 20,
189 NL80211_RRF_NO_IBSS
|
191 /* IEEE 802.11a, channels 100..140 */
192 REG_RULE(5500-10, 5700+10, 40, 6, 30,
193 NL80211_RRF_NO_IBSS
|
198 static const struct ieee80211_regdomain
*static_regdom(char *alpha2
)
200 if (alpha2
[0] == 'U' && alpha2
[1] == 'S')
202 if (alpha2
[0] == 'J' && alpha2
[1] == 'P')
204 if (alpha2
[0] == 'E' && alpha2
[1] == 'U')
206 /* Default, as per the old rules */
210 static bool is_old_static_regdom(const struct ieee80211_regdomain
*rd
)
212 if (rd
== &us_regdom
|| rd
== &jp_regdom
|| rd
== &eu_regdom
)
217 static inline bool is_old_static_regdom(const struct ieee80211_regdomain
*rd
)
223 static void reset_regdomains(void)
225 /* avoid freeing static information or freeing something twice */
226 if (cfg80211_regdomain
== cfg80211_world_regdom
)
227 cfg80211_regdomain
= NULL
;
228 if (cfg80211_world_regdom
== &world_regdom
)
229 cfg80211_world_regdom
= NULL
;
230 if (cfg80211_regdomain
== &world_regdom
)
231 cfg80211_regdomain
= NULL
;
232 if (is_old_static_regdom(cfg80211_regdomain
))
233 cfg80211_regdomain
= NULL
;
235 kfree(cfg80211_regdomain
);
236 kfree(cfg80211_world_regdom
);
238 cfg80211_world_regdom
= &world_regdom
;
239 cfg80211_regdomain
= NULL
;
243 * Dynamic world regulatory domain requested by the wireless
244 * core upon initialization
246 static void update_world_regdomain(const struct ieee80211_regdomain
*rd
)
248 BUG_ON(!last_request
);
252 cfg80211_world_regdom
= rd
;
253 cfg80211_regdomain
= rd
;
256 bool is_world_regdom(const char *alpha2
)
260 if (alpha2
[0] == '0' && alpha2
[1] == '0')
265 static bool is_alpha2_set(const char *alpha2
)
269 if (alpha2
[0] != 0 && alpha2
[1] != 0)
274 static bool is_alpha_upper(char letter
)
277 if (letter
>= 65 && letter
<= 90)
282 static bool is_unknown_alpha2(const char *alpha2
)
287 * Special case where regulatory domain was built by driver
288 * but a specific alpha2 cannot be determined
290 if (alpha2
[0] == '9' && alpha2
[1] == '9')
295 static bool is_intersected_alpha2(const char *alpha2
)
300 * Special case where regulatory domain is the
301 * result of an intersection between two regulatory domain
304 if (alpha2
[0] == '9' && alpha2
[1] == '8')
309 static bool is_an_alpha2(const char *alpha2
)
313 if (is_alpha_upper(alpha2
[0]) && is_alpha_upper(alpha2
[1]))
318 static bool alpha2_equal(const char *alpha2_x
, const char *alpha2_y
)
320 if (!alpha2_x
|| !alpha2_y
)
322 if (alpha2_x
[0] == alpha2_y
[0] &&
323 alpha2_x
[1] == alpha2_y
[1])
328 static bool regdom_changes(const char *alpha2
)
330 assert_cfg80211_lock();
332 if (!cfg80211_regdomain
)
334 if (alpha2_equal(cfg80211_regdomain
->alpha2
, alpha2
))
340 * country_ie_integrity_changes - tells us if the country IE has changed
341 * @checksum: checksum of country IE of fields we are interested in
343 * If the country IE has not changed you can ignore it safely. This is
344 * useful to determine if two devices are seeing two different country IEs
345 * even on the same alpha2. Note that this will return false if no IE has
346 * been set on the wireless core yet.
348 static bool country_ie_integrity_changes(u32 checksum
)
350 /* If no IE has been set then the checksum doesn't change */
351 if (unlikely(!last_request
->country_ie_checksum
))
353 if (unlikely(last_request
->country_ie_checksum
!= checksum
))
359 * This lets us keep regulatory code which is updated on a regulatory
360 * basis in userspace.
362 static int call_crda(const char *alpha2
)
364 char country_env
[9 + 2] = "COUNTRY=";
370 if (!is_world_regdom((char *) alpha2
))
371 printk(KERN_INFO
"cfg80211: Calling CRDA for country: %c%c\n",
372 alpha2
[0], alpha2
[1]);
374 printk(KERN_INFO
"cfg80211: Calling CRDA to update world "
375 "regulatory domain\n");
377 country_env
[8] = alpha2
[0];
378 country_env
[9] = alpha2
[1];
380 return kobject_uevent_env(®_pdev
->dev
.kobj
, KOBJ_CHANGE
, envp
);
383 /* Used by nl80211 before kmalloc'ing our regulatory domain */
384 bool reg_is_valid_request(const char *alpha2
)
389 return alpha2_equal(last_request
->alpha2
, alpha2
);
392 /* Sanity check on a regulatory rule */
393 static bool is_valid_reg_rule(const struct ieee80211_reg_rule
*rule
)
395 const struct ieee80211_freq_range
*freq_range
= &rule
->freq_range
;
398 if (freq_range
->start_freq_khz
<= 0 || freq_range
->end_freq_khz
<= 0)
401 if (freq_range
->start_freq_khz
> freq_range
->end_freq_khz
)
404 freq_diff
= freq_range
->end_freq_khz
- freq_range
->start_freq_khz
;
406 if (freq_range
->end_freq_khz
<= freq_range
->start_freq_khz
||
407 freq_range
->max_bandwidth_khz
> freq_diff
)
413 static bool is_valid_rd(const struct ieee80211_regdomain
*rd
)
415 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
418 if (!rd
->n_reg_rules
)
421 if (WARN_ON(rd
->n_reg_rules
> NL80211_MAX_SUPP_REG_RULES
))
424 for (i
= 0; i
< rd
->n_reg_rules
; i
++) {
425 reg_rule
= &rd
->reg_rules
[i
];
426 if (!is_valid_reg_rule(reg_rule
))
433 /* Returns value in KHz */
434 static u32
freq_max_bandwidth(const struct ieee80211_freq_range
*freq_range
,
438 for (i
= 0; i
< ARRAY_SIZE(supported_bandwidths
); i
++) {
439 u32 start_freq_khz
= freq
- supported_bandwidths
[i
]/2;
440 u32 end_freq_khz
= freq
+ supported_bandwidths
[i
]/2;
441 if (start_freq_khz
>= freq_range
->start_freq_khz
&&
442 end_freq_khz
<= freq_range
->end_freq_khz
)
443 return supported_bandwidths
[i
];
449 * freq_in_rule_band - tells us if a frequency is in a frequency band
450 * @freq_range: frequency rule we want to query
451 * @freq_khz: frequency we are inquiring about
453 * This lets us know if a specific frequency rule is or is not relevant to
454 * a specific frequency's band. Bands are device specific and artificial
455 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
456 * safe for now to assume that a frequency rule should not be part of a
457 * frequency's band if the start freq or end freq are off by more than 2 GHz.
458 * This resolution can be lowered and should be considered as we add
459 * regulatory rule support for other "bands".
461 static bool freq_in_rule_band(const struct ieee80211_freq_range
*freq_range
,
464 #define ONE_GHZ_IN_KHZ 1000000
465 if (abs(freq_khz
- freq_range
->start_freq_khz
) <= (2 * ONE_GHZ_IN_KHZ
))
467 if (abs(freq_khz
- freq_range
->end_freq_khz
) <= (2 * ONE_GHZ_IN_KHZ
))
470 #undef ONE_GHZ_IN_KHZ
474 * Converts a country IE to a regulatory domain. A regulatory domain
475 * structure has a lot of information which the IE doesn't yet have,
476 * so for the other values we use upper max values as we will intersect
477 * with our userspace regulatory agent to get lower bounds.
479 static struct ieee80211_regdomain
*country_ie_2_rd(
484 struct ieee80211_regdomain
*rd
= NULL
;
488 u32 num_rules
= 0, size_of_regd
= 0;
489 u8
*triplets_start
= NULL
;
490 u8 len_at_triplet
= 0;
491 /* the last channel we have registered in a subband (triplet) */
492 int last_sub_max_channel
= 0;
494 *checksum
= 0xDEADBEEF;
496 /* Country IE requirements */
497 BUG_ON(country_ie_len
< IEEE80211_COUNTRY_IE_MIN_LEN
||
498 country_ie_len
& 0x01);
500 alpha2
[0] = country_ie
[0];
501 alpha2
[1] = country_ie
[1];
504 * Third octet can be:
508 * anything else we assume is no restrictions
510 if (country_ie
[2] == 'I')
511 flags
= NL80211_RRF_NO_OUTDOOR
;
512 else if (country_ie
[2] == 'O')
513 flags
= NL80211_RRF_NO_INDOOR
;
518 triplets_start
= country_ie
;
519 len_at_triplet
= country_ie_len
;
521 *checksum
^= ((flags
^ alpha2
[0] ^ alpha2
[1]) << 8);
524 * We need to build a reg rule for each triplet, but first we must
525 * calculate the number of reg rules we will need. We will need one
526 * for each channel subband
528 while (country_ie_len
>= 3) {
530 struct ieee80211_country_ie_triplet
*triplet
=
531 (struct ieee80211_country_ie_triplet
*) country_ie
;
532 int cur_sub_max_channel
= 0, cur_channel
= 0;
534 if (triplet
->ext
.reg_extension_id
>=
535 IEEE80211_COUNTRY_EXTENSION_ID
) {
542 if (triplet
->chans
.first_channel
<= 14)
543 end_channel
= triplet
->chans
.first_channel
+
544 triplet
->chans
.num_channels
;
547 * 5 GHz -- For example in country IEs if the first
548 * channel given is 36 and the number of channels is 4
549 * then the individual channel numbers defined for the
550 * 5 GHz PHY by these parameters are: 36, 40, 44, and 48
551 * and not 36, 37, 38, 39.
553 * See: http://tinyurl.com/11d-clarification
555 end_channel
= triplet
->chans
.first_channel
+
556 (4 * (triplet
->chans
.num_channels
- 1));
558 cur_channel
= triplet
->chans
.first_channel
;
559 cur_sub_max_channel
= end_channel
;
561 /* Basic sanity check */
562 if (cur_sub_max_channel
< cur_channel
)
566 * Do not allow overlapping channels. Also channels
567 * passed in each subband must be monotonically
570 if (last_sub_max_channel
) {
571 if (cur_channel
<= last_sub_max_channel
)
573 if (cur_sub_max_channel
<= last_sub_max_channel
)
578 * When dot11RegulatoryClassesRequired is supported
579 * we can throw ext triplets as part of this soup,
580 * for now we don't care when those change as we
583 *checksum
^= ((cur_channel
^ cur_sub_max_channel
) << 8) |
584 ((cur_sub_max_channel
^ cur_sub_max_channel
) << 16) |
585 ((triplet
->chans
.max_power
^ cur_sub_max_channel
) << 24);
587 last_sub_max_channel
= cur_sub_max_channel
;
594 * Note: this is not a IEEE requirement but
595 * simply a memory requirement
597 if (num_rules
> NL80211_MAX_SUPP_REG_RULES
)
601 country_ie
= triplets_start
;
602 country_ie_len
= len_at_triplet
;
604 size_of_regd
= sizeof(struct ieee80211_regdomain
) +
605 (num_rules
* sizeof(struct ieee80211_reg_rule
));
607 rd
= kzalloc(size_of_regd
, GFP_KERNEL
);
611 rd
->n_reg_rules
= num_rules
;
612 rd
->alpha2
[0] = alpha2
[0];
613 rd
->alpha2
[1] = alpha2
[1];
615 /* This time around we fill in the rd */
616 while (country_ie_len
>= 3) {
618 struct ieee80211_country_ie_triplet
*triplet
=
619 (struct ieee80211_country_ie_triplet
*) country_ie
;
620 struct ieee80211_reg_rule
*reg_rule
= NULL
;
621 struct ieee80211_freq_range
*freq_range
= NULL
;
622 struct ieee80211_power_rule
*power_rule
= NULL
;
625 * Must parse if dot11RegulatoryClassesRequired is true,
626 * we don't support this yet
628 if (triplet
->ext
.reg_extension_id
>=
629 IEEE80211_COUNTRY_EXTENSION_ID
) {
635 reg_rule
= &rd
->reg_rules
[i
];
636 freq_range
= ®_rule
->freq_range
;
637 power_rule
= ®_rule
->power_rule
;
639 reg_rule
->flags
= flags
;
642 if (triplet
->chans
.first_channel
<= 14)
643 end_channel
= triplet
->chans
.first_channel
+
644 triplet
->chans
.num_channels
;
646 end_channel
= triplet
->chans
.first_channel
+
647 (4 * (triplet
->chans
.num_channels
- 1));
650 * The +10 is since the regulatory domain expects
651 * the actual band edge, not the center of freq for
652 * its start and end freqs, assuming 20 MHz bandwidth on
653 * the channels passed
655 freq_range
->start_freq_khz
=
656 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
657 triplet
->chans
.first_channel
) - 10);
658 freq_range
->end_freq_khz
=
659 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
663 * These are large arbitrary values we use to intersect later.
664 * Increment this if we ever support >= 40 MHz channels
667 freq_range
->max_bandwidth_khz
= MHZ_TO_KHZ(40);
668 power_rule
->max_antenna_gain
= DBI_TO_MBI(100);
669 power_rule
->max_eirp
= DBM_TO_MBM(100);
675 BUG_ON(i
> NL80211_MAX_SUPP_REG_RULES
);
683 * Helper for regdom_intersect(), this does the real
684 * mathematical intersection fun
686 static int reg_rules_intersect(
687 const struct ieee80211_reg_rule
*rule1
,
688 const struct ieee80211_reg_rule
*rule2
,
689 struct ieee80211_reg_rule
*intersected_rule
)
691 const struct ieee80211_freq_range
*freq_range1
, *freq_range2
;
692 struct ieee80211_freq_range
*freq_range
;
693 const struct ieee80211_power_rule
*power_rule1
, *power_rule2
;
694 struct ieee80211_power_rule
*power_rule
;
697 freq_range1
= &rule1
->freq_range
;
698 freq_range2
= &rule2
->freq_range
;
699 freq_range
= &intersected_rule
->freq_range
;
701 power_rule1
= &rule1
->power_rule
;
702 power_rule2
= &rule2
->power_rule
;
703 power_rule
= &intersected_rule
->power_rule
;
705 freq_range
->start_freq_khz
= max(freq_range1
->start_freq_khz
,
706 freq_range2
->start_freq_khz
);
707 freq_range
->end_freq_khz
= min(freq_range1
->end_freq_khz
,
708 freq_range2
->end_freq_khz
);
709 freq_range
->max_bandwidth_khz
= min(freq_range1
->max_bandwidth_khz
,
710 freq_range2
->max_bandwidth_khz
);
712 freq_diff
= freq_range
->end_freq_khz
- freq_range
->start_freq_khz
;
713 if (freq_range
->max_bandwidth_khz
> freq_diff
)
714 freq_range
->max_bandwidth_khz
= freq_diff
;
716 power_rule
->max_eirp
= min(power_rule1
->max_eirp
,
717 power_rule2
->max_eirp
);
718 power_rule
->max_antenna_gain
= min(power_rule1
->max_antenna_gain
,
719 power_rule2
->max_antenna_gain
);
721 intersected_rule
->flags
= (rule1
->flags
| rule2
->flags
);
723 if (!is_valid_reg_rule(intersected_rule
))
730 * regdom_intersect - do the intersection between two regulatory domains
731 * @rd1: first regulatory domain
732 * @rd2: second regulatory domain
734 * Use this function to get the intersection between two regulatory domains.
735 * Once completed we will mark the alpha2 for the rd as intersected, "98",
736 * as no one single alpha2 can represent this regulatory domain.
738 * Returns a pointer to the regulatory domain structure which will hold the
739 * resulting intersection of rules between rd1 and rd2. We will
740 * kzalloc() this structure for you.
742 static struct ieee80211_regdomain
*regdom_intersect(
743 const struct ieee80211_regdomain
*rd1
,
744 const struct ieee80211_regdomain
*rd2
)
748 unsigned int num_rules
= 0, rule_idx
= 0;
749 const struct ieee80211_reg_rule
*rule1
, *rule2
;
750 struct ieee80211_reg_rule
*intersected_rule
;
751 struct ieee80211_regdomain
*rd
;
752 /* This is just a dummy holder to help us count */
753 struct ieee80211_reg_rule irule
;
755 /* Uses the stack temporarily for counter arithmetic */
756 intersected_rule
= &irule
;
758 memset(intersected_rule
, 0, sizeof(struct ieee80211_reg_rule
));
764 * First we get a count of the rules we'll need, then we actually
765 * build them. This is to so we can malloc() and free() a
766 * regdomain once. The reason we use reg_rules_intersect() here
767 * is it will return -EINVAL if the rule computed makes no sense.
768 * All rules that do check out OK are valid.
771 for (x
= 0; x
< rd1
->n_reg_rules
; x
++) {
772 rule1
= &rd1
->reg_rules
[x
];
773 for (y
= 0; y
< rd2
->n_reg_rules
; y
++) {
774 rule2
= &rd2
->reg_rules
[y
];
775 if (!reg_rules_intersect(rule1
, rule2
,
778 memset(intersected_rule
, 0,
779 sizeof(struct ieee80211_reg_rule
));
786 size_of_regd
= sizeof(struct ieee80211_regdomain
) +
787 ((num_rules
+ 1) * sizeof(struct ieee80211_reg_rule
));
789 rd
= kzalloc(size_of_regd
, GFP_KERNEL
);
793 for (x
= 0; x
< rd1
->n_reg_rules
; x
++) {
794 rule1
= &rd1
->reg_rules
[x
];
795 for (y
= 0; y
< rd2
->n_reg_rules
; y
++) {
796 rule2
= &rd2
->reg_rules
[y
];
798 * This time around instead of using the stack lets
799 * write to the target rule directly saving ourselves
802 intersected_rule
= &rd
->reg_rules
[rule_idx
];
803 r
= reg_rules_intersect(rule1
, rule2
,
806 * No need to memset here the intersected rule here as
807 * we're not using the stack anymore
815 if (rule_idx
!= num_rules
) {
820 rd
->n_reg_rules
= num_rules
;
828 * XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
829 * want to just have the channel structure use these
831 static u32
map_regdom_flags(u32 rd_flags
)
833 u32 channel_flags
= 0;
834 if (rd_flags
& NL80211_RRF_PASSIVE_SCAN
)
835 channel_flags
|= IEEE80211_CHAN_PASSIVE_SCAN
;
836 if (rd_flags
& NL80211_RRF_NO_IBSS
)
837 channel_flags
|= IEEE80211_CHAN_NO_IBSS
;
838 if (rd_flags
& NL80211_RRF_DFS
)
839 channel_flags
|= IEEE80211_CHAN_RADAR
;
840 return channel_flags
;
843 static int freq_reg_info_regd(struct wiphy
*wiphy
,
846 const struct ieee80211_reg_rule
**reg_rule
,
847 const struct ieee80211_regdomain
*custom_regd
)
850 bool band_rule_found
= false;
851 const struct ieee80211_regdomain
*regd
;
852 u32 max_bandwidth
= 0;
854 regd
= custom_regd
? custom_regd
: cfg80211_regdomain
;
857 * Follow the driver's regulatory domain, if present, unless a country
858 * IE has been processed or a user wants to help complaince further
860 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
861 last_request
->initiator
!= NL80211_REGDOM_SET_BY_USER
&&
868 for (i
= 0; i
< regd
->n_reg_rules
; i
++) {
869 const struct ieee80211_reg_rule
*rr
;
870 const struct ieee80211_freq_range
*fr
= NULL
;
871 const struct ieee80211_power_rule
*pr
= NULL
;
873 rr
= ®d
->reg_rules
[i
];
874 fr
= &rr
->freq_range
;
875 pr
= &rr
->power_rule
;
878 * We only need to know if one frequency rule was
879 * was in center_freq's band, that's enough, so lets
880 * not overwrite it once found
882 if (!band_rule_found
)
883 band_rule_found
= freq_in_rule_band(fr
, center_freq
);
885 max_bandwidth
= freq_max_bandwidth(fr
, center_freq
);
887 if (max_bandwidth
&& *bandwidth
<= max_bandwidth
) {
889 *bandwidth
= max_bandwidth
;
894 if (!band_rule_found
)
897 return !max_bandwidth
;
899 EXPORT_SYMBOL(freq_reg_info
);
901 int freq_reg_info(struct wiphy
*wiphy
, u32 center_freq
, u32
*bandwidth
,
902 const struct ieee80211_reg_rule
**reg_rule
)
904 return freq_reg_info_regd(wiphy
, center_freq
,
905 bandwidth
, reg_rule
, NULL
);
908 static void handle_channel(struct wiphy
*wiphy
, enum ieee80211_band band
,
909 unsigned int chan_idx
)
913 u32 max_bandwidth
= 0;
914 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
915 const struct ieee80211_power_rule
*power_rule
= NULL
;
916 struct ieee80211_supported_band
*sband
;
917 struct ieee80211_channel
*chan
;
918 struct wiphy
*request_wiphy
= NULL
;
920 assert_cfg80211_lock();
922 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
924 sband
= wiphy
->bands
[band
];
925 BUG_ON(chan_idx
>= sband
->n_channels
);
926 chan
= &sband
->channels
[chan_idx
];
928 flags
= chan
->orig_flags
;
930 r
= freq_reg_info(wiphy
, MHZ_TO_KHZ(chan
->center_freq
),
931 &max_bandwidth
, ®_rule
);
935 * This means no regulatory rule was found in the country IE
936 * with a frequency range on the center_freq's band, since
937 * IEEE-802.11 allows for a country IE to have a subset of the
938 * regulatory information provided in a country we ignore
939 * disabling the channel unless at least one reg rule was
940 * found on the center_freq's band. For details see this
943 * http://tinyurl.com/11d-clarification
946 last_request
->initiator
==
947 NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
948 #ifdef CONFIG_CFG80211_REG_DEBUG
949 printk(KERN_DEBUG
"cfg80211: Leaving channel %d MHz "
950 "intact on %s - no rule found in band on "
952 chan
->center_freq
, wiphy_name(wiphy
));
956 * In this case we know the country IE has at least one reg rule
957 * for the band so we respect its band definitions
959 #ifdef CONFIG_CFG80211_REG_DEBUG
960 if (last_request
->initiator
==
961 NL80211_REGDOM_SET_BY_COUNTRY_IE
)
962 printk(KERN_DEBUG
"cfg80211: Disabling "
963 "channel %d MHz on %s due to "
965 chan
->center_freq
, wiphy_name(wiphy
));
967 flags
|= IEEE80211_CHAN_DISABLED
;
973 power_rule
= ®_rule
->power_rule
;
975 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
&&
976 request_wiphy
&& request_wiphy
== wiphy
&&
977 request_wiphy
->strict_regulatory
) {
979 * This gaurantees the driver's requested regulatory domain
980 * will always be used as a base for further regulatory
983 chan
->flags
= chan
->orig_flags
=
984 map_regdom_flags(reg_rule
->flags
);
985 chan
->max_antenna_gain
= chan
->orig_mag
=
986 (int) MBI_TO_DBI(power_rule
->max_antenna_gain
);
987 chan
->max_bandwidth
= KHZ_TO_MHZ(max_bandwidth
);
988 chan
->max_power
= chan
->orig_mpwr
=
989 (int) MBM_TO_DBM(power_rule
->max_eirp
);
993 chan
->flags
= flags
| map_regdom_flags(reg_rule
->flags
);
994 chan
->max_antenna_gain
= min(chan
->orig_mag
,
995 (int) MBI_TO_DBI(power_rule
->max_antenna_gain
));
996 chan
->max_bandwidth
= KHZ_TO_MHZ(max_bandwidth
);
998 chan
->max_power
= min(chan
->orig_mpwr
,
999 (int) MBM_TO_DBM(power_rule
->max_eirp
));
1001 chan
->max_power
= (int) MBM_TO_DBM(power_rule
->max_eirp
);
1004 static void handle_band(struct wiphy
*wiphy
, enum ieee80211_band band
)
1007 struct ieee80211_supported_band
*sband
;
1009 BUG_ON(!wiphy
->bands
[band
]);
1010 sband
= wiphy
->bands
[band
];
1012 for (i
= 0; i
< sband
->n_channels
; i
++)
1013 handle_channel(wiphy
, band
, i
);
1016 static bool ignore_reg_update(struct wiphy
*wiphy
,
1017 enum nl80211_reg_initiator initiator
)
1021 if (initiator
== NL80211_REGDOM_SET_BY_CORE
&&
1022 wiphy
->custom_regulatory
)
1025 * wiphy->regd will be set once the device has its own
1026 * desired regulatory domain set
1028 if (wiphy
->strict_regulatory
&& !wiphy
->regd
&&
1029 !is_world_regdom(last_request
->alpha2
))
1034 static void update_all_wiphy_regulatory(enum nl80211_reg_initiator initiator
)
1036 struct cfg80211_registered_device
*drv
;
1038 list_for_each_entry(drv
, &cfg80211_drv_list
, list
)
1039 wiphy_update_regulatory(&drv
->wiphy
, initiator
);
1042 static void handle_reg_beacon(struct wiphy
*wiphy
,
1043 unsigned int chan_idx
,
1044 struct reg_beacon
*reg_beacon
)
1046 #ifdef CONFIG_CFG80211_REG_DEBUG
1047 #define REG_DEBUG_BEACON_FLAG(desc) \
1048 printk(KERN_DEBUG "cfg80211: Enabling " desc " on " \
1049 "frequency: %d MHz (Ch %d) on %s\n", \
1050 reg_beacon->chan.center_freq, \
1051 ieee80211_frequency_to_channel(reg_beacon->chan.center_freq), \
1054 #define REG_DEBUG_BEACON_FLAG(desc) do {} while (0)
1056 struct ieee80211_supported_band
*sband
;
1057 struct ieee80211_channel
*chan
;
1059 assert_cfg80211_lock();
1061 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
1062 chan
= &sband
->channels
[chan_idx
];
1064 if (likely(chan
->center_freq
!= reg_beacon
->chan
.center_freq
))
1067 if (chan
->flags
& IEEE80211_CHAN_PASSIVE_SCAN
) {
1068 chan
->flags
&= ~IEEE80211_CHAN_PASSIVE_SCAN
;
1069 REG_DEBUG_BEACON_FLAG("active scanning");
1072 if (chan
->flags
& IEEE80211_CHAN_NO_IBSS
) {
1073 chan
->flags
&= ~IEEE80211_CHAN_NO_IBSS
;
1074 REG_DEBUG_BEACON_FLAG("beaconing");
1077 chan
->beacon_found
= true;
1078 #undef REG_DEBUG_BEACON_FLAG
1082 * Called when a scan on a wiphy finds a beacon on
1085 static void wiphy_update_new_beacon(struct wiphy
*wiphy
,
1086 struct reg_beacon
*reg_beacon
)
1089 struct ieee80211_supported_band
*sband
;
1091 assert_cfg80211_lock();
1093 if (!wiphy
->bands
[reg_beacon
->chan
.band
])
1096 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
1098 for (i
= 0; i
< sband
->n_channels
; i
++)
1099 handle_reg_beacon(wiphy
, i
, reg_beacon
);
1103 * Called upon reg changes or a new wiphy is added
1105 static void wiphy_update_beacon_reg(struct wiphy
*wiphy
)
1108 struct ieee80211_supported_band
*sband
;
1109 struct reg_beacon
*reg_beacon
;
1111 assert_cfg80211_lock();
1113 if (list_empty(®_beacon_list
))
1116 list_for_each_entry(reg_beacon
, ®_beacon_list
, list
) {
1117 if (!wiphy
->bands
[reg_beacon
->chan
.band
])
1119 sband
= wiphy
->bands
[reg_beacon
->chan
.band
];
1120 for (i
= 0; i
< sband
->n_channels
; i
++)
1121 handle_reg_beacon(wiphy
, i
, reg_beacon
);
1125 static bool reg_is_world_roaming(struct wiphy
*wiphy
)
1127 if (is_world_regdom(cfg80211_regdomain
->alpha2
) ||
1128 (wiphy
->regd
&& is_world_regdom(wiphy
->regd
->alpha2
)))
1130 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
&&
1131 wiphy
->custom_regulatory
)
1136 /* Reap the advantages of previously found beacons */
1137 static void reg_process_beacons(struct wiphy
*wiphy
)
1139 if (!reg_is_world_roaming(wiphy
))
1141 wiphy_update_beacon_reg(wiphy
);
1144 void wiphy_update_regulatory(struct wiphy
*wiphy
,
1145 enum nl80211_reg_initiator initiator
)
1147 enum ieee80211_band band
;
1149 if (ignore_reg_update(wiphy
, initiator
))
1151 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
1152 if (wiphy
->bands
[band
])
1153 handle_band(wiphy
, band
);
1156 reg_process_beacons(wiphy
);
1157 if (wiphy
->reg_notifier
)
1158 wiphy
->reg_notifier(wiphy
, last_request
);
1161 static void handle_channel_custom(struct wiphy
*wiphy
,
1162 enum ieee80211_band band
,
1163 unsigned int chan_idx
,
1164 const struct ieee80211_regdomain
*regd
)
1167 u32 max_bandwidth
= 0;
1168 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
1169 const struct ieee80211_power_rule
*power_rule
= NULL
;
1170 struct ieee80211_supported_band
*sband
;
1171 struct ieee80211_channel
*chan
;
1173 sband
= wiphy
->bands
[band
];
1174 BUG_ON(chan_idx
>= sband
->n_channels
);
1175 chan
= &sband
->channels
[chan_idx
];
1177 r
= freq_reg_info_regd(wiphy
, MHZ_TO_KHZ(chan
->center_freq
),
1178 &max_bandwidth
, ®_rule
, regd
);
1181 chan
->flags
= IEEE80211_CHAN_DISABLED
;
1185 power_rule
= ®_rule
->power_rule
;
1187 chan
->flags
|= map_regdom_flags(reg_rule
->flags
);
1188 chan
->max_antenna_gain
= (int) MBI_TO_DBI(power_rule
->max_antenna_gain
);
1189 chan
->max_bandwidth
= KHZ_TO_MHZ(max_bandwidth
);
1190 chan
->max_power
= (int) MBM_TO_DBM(power_rule
->max_eirp
);
1193 static void handle_band_custom(struct wiphy
*wiphy
, enum ieee80211_band band
,
1194 const struct ieee80211_regdomain
*regd
)
1197 struct ieee80211_supported_band
*sband
;
1199 BUG_ON(!wiphy
->bands
[band
]);
1200 sband
= wiphy
->bands
[band
];
1202 for (i
= 0; i
< sband
->n_channels
; i
++)
1203 handle_channel_custom(wiphy
, band
, i
, regd
);
1206 /* Used by drivers prior to wiphy registration */
1207 void wiphy_apply_custom_regulatory(struct wiphy
*wiphy
,
1208 const struct ieee80211_regdomain
*regd
)
1210 enum ieee80211_band band
;
1211 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
1212 if (wiphy
->bands
[band
])
1213 handle_band_custom(wiphy
, band
, regd
);
1216 EXPORT_SYMBOL(wiphy_apply_custom_regulatory
);
1218 static int reg_copy_regd(const struct ieee80211_regdomain
**dst_regd
,
1219 const struct ieee80211_regdomain
*src_regd
)
1221 struct ieee80211_regdomain
*regd
;
1222 int size_of_regd
= 0;
1225 size_of_regd
= sizeof(struct ieee80211_regdomain
) +
1226 ((src_regd
->n_reg_rules
+ 1) * sizeof(struct ieee80211_reg_rule
));
1228 regd
= kzalloc(size_of_regd
, GFP_KERNEL
);
1232 memcpy(regd
, src_regd
, sizeof(struct ieee80211_regdomain
));
1234 for (i
= 0; i
< src_regd
->n_reg_rules
; i
++)
1235 memcpy(®d
->reg_rules
[i
], &src_regd
->reg_rules
[i
],
1236 sizeof(struct ieee80211_reg_rule
));
1243 * Return value which can be used by ignore_request() to indicate
1244 * it has been determined we should intersect two regulatory domains
1246 #define REG_INTERSECT 1
1248 /* This has the logic which determines when a new request
1249 * should be ignored. */
1250 static int ignore_request(struct wiphy
*wiphy
,
1251 struct regulatory_request
*pending_request
)
1253 struct wiphy
*last_wiphy
= NULL
;
1255 assert_cfg80211_lock();
1257 /* All initial requests are respected */
1261 switch (pending_request
->initiator
) {
1262 case NL80211_REGDOM_SET_BY_CORE
:
1264 case NL80211_REGDOM_SET_BY_COUNTRY_IE
:
1266 last_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
1268 if (unlikely(!is_an_alpha2(pending_request
->alpha2
)))
1270 if (last_request
->initiator
==
1271 NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
1272 if (last_wiphy
!= wiphy
) {
1274 * Two cards with two APs claiming different
1275 * different Country IE alpha2s. We could
1276 * intersect them, but that seems unlikely
1277 * to be correct. Reject second one for now.
1279 if (regdom_changes(pending_request
->alpha2
))
1284 * Two consecutive Country IE hints on the same wiphy.
1285 * This should be picked up early by the driver/stack
1287 if (WARN_ON(regdom_changes(pending_request
->alpha2
)))
1291 return REG_INTERSECT
;
1292 case NL80211_REGDOM_SET_BY_DRIVER
:
1293 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_CORE
) {
1294 if (is_old_static_regdom(cfg80211_regdomain
))
1296 if (regdom_changes(pending_request
->alpha2
))
1302 * This would happen if you unplug and plug your card
1303 * back in or if you add a new device for which the previously
1304 * loaded card also agrees on the regulatory domain.
1306 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
&&
1307 !regdom_changes(pending_request
->alpha2
))
1310 return REG_INTERSECT
;
1311 case NL80211_REGDOM_SET_BY_USER
:
1312 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_COUNTRY_IE
)
1313 return REG_INTERSECT
;
1315 * If the user knows better the user should set the regdom
1316 * to their country before the IE is picked up
1318 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_USER
&&
1319 last_request
->intersect
)
1322 * Process user requests only after previous user/driver/core
1323 * requests have been processed
1325 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_CORE
||
1326 last_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
||
1327 last_request
->initiator
== NL80211_REGDOM_SET_BY_USER
) {
1328 if (regdom_changes(last_request
->alpha2
))
1332 if (!is_old_static_regdom(cfg80211_regdomain
) &&
1333 !regdom_changes(pending_request
->alpha2
))
1343 * __regulatory_hint - hint to the wireless core a regulatory domain
1344 * @wiphy: if the hint comes from country information from an AP, this
1345 * is required to be set to the wiphy that received the information
1346 * @pending_request: the regulatory request currently being processed
1348 * The Wireless subsystem can use this function to hint to the wireless core
1349 * what it believes should be the current regulatory domain.
1351 * Returns zero if all went fine, %-EALREADY if a regulatory domain had
1352 * already been set or other standard error codes.
1354 * Caller must hold &cfg80211_mutex
1356 static int __regulatory_hint(struct wiphy
*wiphy
,
1357 struct regulatory_request
*pending_request
)
1359 bool intersect
= false;
1362 assert_cfg80211_lock();
1364 r
= ignore_request(wiphy
, pending_request
);
1366 if (r
== REG_INTERSECT
) {
1367 if (pending_request
->initiator
==
1368 NL80211_REGDOM_SET_BY_DRIVER
) {
1369 r
= reg_copy_regd(&wiphy
->regd
, cfg80211_regdomain
);
1371 kfree(pending_request
);
1378 * If the regulatory domain being requested by the
1379 * driver has already been set just copy it to the
1382 if (r
== -EALREADY
&&
1383 pending_request
->initiator
==
1384 NL80211_REGDOM_SET_BY_DRIVER
) {
1385 r
= reg_copy_regd(&wiphy
->regd
, cfg80211_regdomain
);
1387 kfree(pending_request
);
1393 kfree(pending_request
);
1398 kfree(last_request
);
1400 last_request
= pending_request
;
1401 last_request
->intersect
= intersect
;
1403 pending_request
= NULL
;
1405 /* When r == REG_INTERSECT we do need to call CRDA */
1410 * Note: When CONFIG_WIRELESS_OLD_REGULATORY is enabled
1411 * AND if CRDA is NOT present nothing will happen, if someone
1412 * wants to bother with 11d with OLD_REG you can add a timer.
1413 * If after x amount of time nothing happens you can call:
1415 * return set_regdom(country_ie_regdomain);
1417 * to intersect with the static rd
1419 return call_crda(last_request
->alpha2
);
1422 /* This currently only processes user and driver regulatory hints */
1423 static void reg_process_hint(struct regulatory_request
*reg_request
)
1426 struct wiphy
*wiphy
= NULL
;
1428 BUG_ON(!reg_request
->alpha2
);
1430 mutex_lock(&cfg80211_mutex
);
1432 if (wiphy_idx_valid(reg_request
->wiphy_idx
))
1433 wiphy
= wiphy_idx_to_wiphy(reg_request
->wiphy_idx
);
1435 if (reg_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
&&
1441 r
= __regulatory_hint(wiphy
, reg_request
);
1442 /* This is required so that the orig_* parameters are saved */
1443 if (r
== -EALREADY
&& wiphy
&& wiphy
->strict_regulatory
)
1444 wiphy_update_regulatory(wiphy
, reg_request
->initiator
);
1446 mutex_unlock(&cfg80211_mutex
);
1449 /* Processes regulatory hints, this is all the NL80211_REGDOM_SET_BY_* */
1450 static void reg_process_pending_hints(void)
1452 struct regulatory_request
*reg_request
;
1454 spin_lock(®_requests_lock
);
1455 while (!list_empty(®_requests_list
)) {
1456 reg_request
= list_first_entry(®_requests_list
,
1457 struct regulatory_request
,
1459 list_del_init(®_request
->list
);
1461 spin_unlock(®_requests_lock
);
1462 reg_process_hint(reg_request
);
1463 spin_lock(®_requests_lock
);
1465 spin_unlock(®_requests_lock
);
1468 /* Processes beacon hints -- this has nothing to do with country IEs */
1469 static void reg_process_pending_beacon_hints(void)
1471 struct cfg80211_registered_device
*drv
;
1472 struct reg_beacon
*pending_beacon
, *tmp
;
1474 mutex_lock(&cfg80211_mutex
);
1476 /* This goes through the _pending_ beacon list */
1477 spin_lock_bh(®_pending_beacons_lock
);
1479 if (list_empty(®_pending_beacons
)) {
1480 spin_unlock_bh(®_pending_beacons_lock
);
1484 list_for_each_entry_safe(pending_beacon
, tmp
,
1485 ®_pending_beacons
, list
) {
1487 list_del_init(&pending_beacon
->list
);
1489 /* Applies the beacon hint to current wiphys */
1490 list_for_each_entry(drv
, &cfg80211_drv_list
, list
)
1491 wiphy_update_new_beacon(&drv
->wiphy
, pending_beacon
);
1493 /* Remembers the beacon hint for new wiphys or reg changes */
1494 list_add_tail(&pending_beacon
->list
, ®_beacon_list
);
1497 spin_unlock_bh(®_pending_beacons_lock
);
1499 mutex_unlock(&cfg80211_mutex
);
1502 static void reg_todo(struct work_struct
*work
)
1504 reg_process_pending_hints();
1505 reg_process_pending_beacon_hints();
1508 static DECLARE_WORK(reg_work
, reg_todo
);
1510 static void queue_regulatory_request(struct regulatory_request
*request
)
1512 spin_lock(®_requests_lock
);
1513 list_add_tail(&request
->list
, ®_requests_list
);
1514 spin_unlock(®_requests_lock
);
1516 schedule_work(®_work
);
1519 /* Core regulatory hint -- happens once during cfg80211_init() */
1520 static int regulatory_hint_core(const char *alpha2
)
1522 struct regulatory_request
*request
;
1524 BUG_ON(last_request
);
1526 request
= kzalloc(sizeof(struct regulatory_request
),
1531 request
->alpha2
[0] = alpha2
[0];
1532 request
->alpha2
[1] = alpha2
[1];
1533 request
->initiator
= NL80211_REGDOM_SET_BY_CORE
;
1535 queue_regulatory_request(request
);
1541 int regulatory_hint_user(const char *alpha2
)
1543 struct regulatory_request
*request
;
1547 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
1551 request
->wiphy_idx
= WIPHY_IDX_STALE
;
1552 request
->alpha2
[0] = alpha2
[0];
1553 request
->alpha2
[1] = alpha2
[1];
1554 request
->initiator
= NL80211_REGDOM_SET_BY_USER
,
1556 queue_regulatory_request(request
);
1562 int regulatory_hint(struct wiphy
*wiphy
, const char *alpha2
)
1564 struct regulatory_request
*request
;
1569 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
1573 request
->wiphy_idx
= get_wiphy_idx(wiphy
);
1575 /* Must have registered wiphy first */
1576 BUG_ON(!wiphy_idx_valid(request
->wiphy_idx
));
1578 request
->alpha2
[0] = alpha2
[0];
1579 request
->alpha2
[1] = alpha2
[1];
1580 request
->initiator
= NL80211_REGDOM_SET_BY_DRIVER
;
1582 queue_regulatory_request(request
);
1586 EXPORT_SYMBOL(regulatory_hint
);
1588 static bool reg_same_country_ie_hint(struct wiphy
*wiphy
,
1589 u32 country_ie_checksum
)
1591 struct wiphy
*request_wiphy
;
1593 assert_cfg80211_lock();
1595 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
1600 if (likely(request_wiphy
!= wiphy
))
1601 return !country_ie_integrity_changes(country_ie_checksum
);
1603 * We should not have let these through at this point, they
1604 * should have been picked up earlier by the first alpha2 check
1607 if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum
)))
1612 void regulatory_hint_11d(struct wiphy
*wiphy
,
1616 struct ieee80211_regdomain
*rd
= NULL
;
1619 enum environment_cap env
= ENVIRON_ANY
;
1620 struct regulatory_request
*request
;
1622 mutex_lock(&cfg80211_mutex
);
1624 if (unlikely(!last_request
)) {
1625 mutex_unlock(&cfg80211_mutex
);
1629 /* IE len must be evenly divisible by 2 */
1630 if (country_ie_len
& 0x01)
1633 if (country_ie_len
< IEEE80211_COUNTRY_IE_MIN_LEN
)
1637 * Pending country IE processing, this can happen after we
1638 * call CRDA and wait for a response if a beacon was received before
1639 * we were able to process the last regulatory_hint_11d() call
1641 if (country_ie_regdomain
)
1644 alpha2
[0] = country_ie
[0];
1645 alpha2
[1] = country_ie
[1];
1647 if (country_ie
[2] == 'I')
1648 env
= ENVIRON_INDOOR
;
1649 else if (country_ie
[2] == 'O')
1650 env
= ENVIRON_OUTDOOR
;
1653 * We will run this for *every* beacon processed for the BSSID, so
1654 * we optimize an early check to exit out early if we don't have to
1657 if (likely(wiphy_idx_valid(last_request
->wiphy_idx
))) {
1658 struct cfg80211_registered_device
*drv_last_ie
;
1661 cfg80211_drv_by_wiphy_idx(last_request
->wiphy_idx
);
1664 * Lets keep this simple -- we trust the first AP
1665 * after we intersect with CRDA
1667 if (likely(&drv_last_ie
->wiphy
== wiphy
)) {
1669 * Ignore IEs coming in on this wiphy with
1670 * the same alpha2 and environment cap
1672 if (likely(alpha2_equal(drv_last_ie
->country_ie_alpha2
,
1674 env
== drv_last_ie
->env
)) {
1678 * the wiphy moved on to another BSSID or the AP
1679 * was reconfigured. XXX: We need to deal with the
1680 * case where the user suspends and goes to goes
1681 * to another country, and then gets IEs from an
1682 * AP with different settings
1687 * Ignore IEs coming in on two separate wiphys with
1688 * the same alpha2 and environment cap
1690 if (likely(alpha2_equal(drv_last_ie
->country_ie_alpha2
,
1692 env
== drv_last_ie
->env
)) {
1695 /* We could potentially intersect though */
1700 rd
= country_ie_2_rd(country_ie
, country_ie_len
, &checksum
);
1705 * This will not happen right now but we leave it here for the
1706 * the future when we want to add suspend/resume support and having
1707 * the user move to another country after doing so, or having the user
1708 * move to another AP. Right now we just trust the first AP.
1710 * If we hit this before we add this support we want to be informed of
1711 * it as it would indicate a mistake in the current design
1713 if (WARN_ON(reg_same_country_ie_hint(wiphy
, checksum
)))
1716 request
= kzalloc(sizeof(struct regulatory_request
), GFP_KERNEL
);
1721 * We keep this around for when CRDA comes back with a response so
1722 * we can intersect with that
1724 country_ie_regdomain
= rd
;
1726 request
->wiphy_idx
= get_wiphy_idx(wiphy
);
1727 request
->alpha2
[0] = rd
->alpha2
[0];
1728 request
->alpha2
[1] = rd
->alpha2
[1];
1729 request
->initiator
= NL80211_REGDOM_SET_BY_COUNTRY_IE
;
1730 request
->country_ie_checksum
= checksum
;
1731 request
->country_ie_env
= env
;
1733 mutex_unlock(&cfg80211_mutex
);
1735 queue_regulatory_request(request
);
1742 mutex_unlock(&cfg80211_mutex
);
1744 EXPORT_SYMBOL(regulatory_hint_11d
);
1746 static bool freq_is_chan_12_13_14(u16 freq
)
1748 if (freq
== ieee80211_channel_to_frequency(12) ||
1749 freq
== ieee80211_channel_to_frequency(13) ||
1750 freq
== ieee80211_channel_to_frequency(14))
1755 int regulatory_hint_found_beacon(struct wiphy
*wiphy
,
1756 struct ieee80211_channel
*beacon_chan
,
1759 struct reg_beacon
*reg_beacon
;
1761 if (likely((beacon_chan
->beacon_found
||
1762 (beacon_chan
->flags
& IEEE80211_CHAN_RADAR
) ||
1763 (beacon_chan
->band
== IEEE80211_BAND_2GHZ
&&
1764 !freq_is_chan_12_13_14(beacon_chan
->center_freq
)))))
1767 reg_beacon
= kzalloc(sizeof(struct reg_beacon
), gfp
);
1771 #ifdef CONFIG_CFG80211_REG_DEBUG
1772 printk(KERN_DEBUG
"cfg80211: Found new beacon on "
1773 "frequency: %d MHz (Ch %d) on %s\n",
1774 beacon_chan
->center_freq
,
1775 ieee80211_frequency_to_channel(beacon_chan
->center_freq
),
1778 memcpy(®_beacon
->chan
, beacon_chan
,
1779 sizeof(struct ieee80211_channel
));
1783 * Since we can be called from BH or and non-BH context
1784 * we must use spin_lock_bh()
1786 spin_lock_bh(®_pending_beacons_lock
);
1787 list_add_tail(®_beacon
->list
, ®_pending_beacons
);
1788 spin_unlock_bh(®_pending_beacons_lock
);
1790 schedule_work(®_work
);
1795 static void print_rd_rules(const struct ieee80211_regdomain
*rd
)
1798 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
1799 const struct ieee80211_freq_range
*freq_range
= NULL
;
1800 const struct ieee80211_power_rule
*power_rule
= NULL
;
1802 printk(KERN_INFO
"\t(start_freq - end_freq @ bandwidth), "
1803 "(max_antenna_gain, max_eirp)\n");
1805 for (i
= 0; i
< rd
->n_reg_rules
; i
++) {
1806 reg_rule
= &rd
->reg_rules
[i
];
1807 freq_range
= ®_rule
->freq_range
;
1808 power_rule
= ®_rule
->power_rule
;
1811 * There may not be documentation for max antenna gain
1812 * in certain regions
1814 if (power_rule
->max_antenna_gain
)
1815 printk(KERN_INFO
"\t(%d KHz - %d KHz @ %d KHz), "
1816 "(%d mBi, %d mBm)\n",
1817 freq_range
->start_freq_khz
,
1818 freq_range
->end_freq_khz
,
1819 freq_range
->max_bandwidth_khz
,
1820 power_rule
->max_antenna_gain
,
1821 power_rule
->max_eirp
);
1823 printk(KERN_INFO
"\t(%d KHz - %d KHz @ %d KHz), "
1825 freq_range
->start_freq_khz
,
1826 freq_range
->end_freq_khz
,
1827 freq_range
->max_bandwidth_khz
,
1828 power_rule
->max_eirp
);
1832 static void print_regdomain(const struct ieee80211_regdomain
*rd
)
1835 if (is_intersected_alpha2(rd
->alpha2
)) {
1837 if (last_request
->initiator
==
1838 NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
1839 struct cfg80211_registered_device
*drv
;
1840 drv
= cfg80211_drv_by_wiphy_idx(
1841 last_request
->wiphy_idx
);
1843 printk(KERN_INFO
"cfg80211: Current regulatory "
1844 "domain updated by AP to: %c%c\n",
1845 drv
->country_ie_alpha2
[0],
1846 drv
->country_ie_alpha2
[1]);
1848 printk(KERN_INFO
"cfg80211: Current regulatory "
1849 "domain intersected: \n");
1851 printk(KERN_INFO
"cfg80211: Current regulatory "
1852 "domain intersected: \n");
1853 } else if (is_world_regdom(rd
->alpha2
))
1854 printk(KERN_INFO
"cfg80211: World regulatory "
1855 "domain updated:\n");
1857 if (is_unknown_alpha2(rd
->alpha2
))
1858 printk(KERN_INFO
"cfg80211: Regulatory domain "
1859 "changed to driver built-in settings "
1860 "(unknown country)\n");
1862 printk(KERN_INFO
"cfg80211: Regulatory domain "
1863 "changed to country: %c%c\n",
1864 rd
->alpha2
[0], rd
->alpha2
[1]);
1869 static void print_regdomain_info(const struct ieee80211_regdomain
*rd
)
1871 printk(KERN_INFO
"cfg80211: Regulatory domain: %c%c\n",
1872 rd
->alpha2
[0], rd
->alpha2
[1]);
1876 #ifdef CONFIG_CFG80211_REG_DEBUG
1877 static void reg_country_ie_process_debug(
1878 const struct ieee80211_regdomain
*rd
,
1879 const struct ieee80211_regdomain
*country_ie_regdomain
,
1880 const struct ieee80211_regdomain
*intersected_rd
)
1882 printk(KERN_DEBUG
"cfg80211: Received country IE:\n");
1883 print_regdomain_info(country_ie_regdomain
);
1884 printk(KERN_DEBUG
"cfg80211: CRDA thinks this should applied:\n");
1885 print_regdomain_info(rd
);
1886 if (intersected_rd
) {
1887 printk(KERN_DEBUG
"cfg80211: We intersect both of these "
1889 print_regdomain_info(intersected_rd
);
1892 printk(KERN_DEBUG
"cfg80211: Intersection between both failed\n");
1895 static inline void reg_country_ie_process_debug(
1896 const struct ieee80211_regdomain
*rd
,
1897 const struct ieee80211_regdomain
*country_ie_regdomain
,
1898 const struct ieee80211_regdomain
*intersected_rd
)
1903 /* Takes ownership of rd only if it doesn't fail */
1904 static int __set_regdom(const struct ieee80211_regdomain
*rd
)
1906 const struct ieee80211_regdomain
*intersected_rd
= NULL
;
1907 struct cfg80211_registered_device
*drv
= NULL
;
1908 struct wiphy
*request_wiphy
;
1909 /* Some basic sanity checks first */
1911 if (is_world_regdom(rd
->alpha2
)) {
1912 if (WARN_ON(!reg_is_valid_request(rd
->alpha2
)))
1914 update_world_regdomain(rd
);
1918 if (!is_alpha2_set(rd
->alpha2
) && !is_an_alpha2(rd
->alpha2
) &&
1919 !is_unknown_alpha2(rd
->alpha2
))
1926 * Lets only bother proceeding on the same alpha2 if the current
1927 * rd is non static (it means CRDA was present and was used last)
1928 * and the pending request came in from a country IE
1930 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
1932 * If someone else asked us to change the rd lets only bother
1933 * checking if the alpha2 changes if CRDA was already called
1935 if (!is_old_static_regdom(cfg80211_regdomain
) &&
1936 !regdom_changes(rd
->alpha2
))
1941 * Now lets set the regulatory domain, update all driver channels
1942 * and finally inform them of what we have done, in case they want
1943 * to review or adjust their own settings based on their own
1944 * internal EEPROM data
1947 if (WARN_ON(!reg_is_valid_request(rd
->alpha2
)))
1950 if (!is_valid_rd(rd
)) {
1951 printk(KERN_ERR
"cfg80211: Invalid "
1952 "regulatory domain detected:\n");
1953 print_regdomain_info(rd
);
1957 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
1959 if (!last_request
->intersect
) {
1962 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_DRIVER
) {
1964 cfg80211_regdomain
= rd
;
1969 * For a driver hint, lets copy the regulatory domain the
1970 * driver wanted to the wiphy to deal with conflicts
1973 BUG_ON(request_wiphy
->regd
);
1975 r
= reg_copy_regd(&request_wiphy
->regd
, rd
);
1980 cfg80211_regdomain
= rd
;
1984 /* Intersection requires a bit more work */
1986 if (last_request
->initiator
!= NL80211_REGDOM_SET_BY_COUNTRY_IE
) {
1988 intersected_rd
= regdom_intersect(rd
, cfg80211_regdomain
);
1989 if (!intersected_rd
)
1993 * We can trash what CRDA provided now.
1994 * However if a driver requested this specific regulatory
1995 * domain we keep it for its private use
1997 if (last_request
->initiator
== NL80211_REGDOM_SET_BY_DRIVER
)
1998 request_wiphy
->regd
= rd
;
2005 cfg80211_regdomain
= intersected_rd
;
2011 * Country IE requests are handled a bit differently, we intersect
2012 * the country IE rd with what CRDA believes that country should have
2015 BUG_ON(!country_ie_regdomain
);
2017 if (rd
!= country_ie_regdomain
) {
2019 * Intersect what CRDA returned and our what we
2020 * had built from the Country IE received
2023 intersected_rd
= regdom_intersect(rd
, country_ie_regdomain
);
2025 reg_country_ie_process_debug(rd
, country_ie_regdomain
,
2028 kfree(country_ie_regdomain
);
2029 country_ie_regdomain
= NULL
;
2032 * This would happen when CRDA was not present and
2033 * OLD_REGULATORY was enabled. We intersect our Country
2034 * IE rd and what was set on cfg80211 originally
2036 intersected_rd
= regdom_intersect(rd
, cfg80211_regdomain
);
2039 if (!intersected_rd
)
2042 drv
= wiphy_to_dev(request_wiphy
);
2044 drv
->country_ie_alpha2
[0] = rd
->alpha2
[0];
2045 drv
->country_ie_alpha2
[1] = rd
->alpha2
[1];
2046 drv
->env
= last_request
->country_ie_env
;
2048 BUG_ON(intersected_rd
== rd
);
2054 cfg80211_regdomain
= intersected_rd
;
2061 * Use this call to set the current regulatory domain. Conflicts with
2062 * multiple drivers can be ironed out later. Caller must've already
2063 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex
2065 int set_regdom(const struct ieee80211_regdomain
*rd
)
2069 assert_cfg80211_lock();
2071 /* Note that this doesn't update the wiphys, this is done below */
2072 r
= __set_regdom(rd
);
2078 /* This would make this whole thing pointless */
2079 if (!last_request
->intersect
)
2080 BUG_ON(rd
!= cfg80211_regdomain
);
2082 /* update all wiphys now with the new established regulatory domain */
2083 update_all_wiphy_regulatory(last_request
->initiator
);
2085 print_regdomain(cfg80211_regdomain
);
2090 /* Caller must hold cfg80211_mutex */
2091 void reg_device_remove(struct wiphy
*wiphy
)
2093 struct wiphy
*request_wiphy
;
2095 assert_cfg80211_lock();
2097 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
2100 if (!last_request
|| !request_wiphy
)
2102 if (request_wiphy
!= wiphy
)
2104 last_request
->wiphy_idx
= WIPHY_IDX_STALE
;
2105 last_request
->country_ie_env
= ENVIRON_ANY
;
2108 int regulatory_init(void)
2112 reg_pdev
= platform_device_register_simple("regulatory", 0, NULL
, 0);
2113 if (IS_ERR(reg_pdev
))
2114 return PTR_ERR(reg_pdev
);
2116 spin_lock_init(®_requests_lock
);
2117 spin_lock_init(®_pending_beacons_lock
);
2119 #ifdef CONFIG_WIRELESS_OLD_REGULATORY
2120 cfg80211_regdomain
= static_regdom(ieee80211_regdom
);
2122 printk(KERN_INFO
"cfg80211: Using static regulatory domain info\n");
2123 print_regdomain_info(cfg80211_regdomain
);
2125 * The old code still requests for a new regdomain and if
2126 * you have CRDA you get it updated, otherwise you get
2127 * stuck with the static values. We ignore "EU" code as
2128 * that is not a valid ISO / IEC 3166 alpha2
2130 if (ieee80211_regdom
[0] != 'E' || ieee80211_regdom
[1] != 'U')
2131 err
= regulatory_hint_core(ieee80211_regdom
);
2133 cfg80211_regdomain
= cfg80211_world_regdom
;
2135 err
= regulatory_hint_core("00");
2141 * N.B. kobject_uevent_env() can fail mainly for when we're out
2142 * memory which is handled and propagated appropriately above
2143 * but it can also fail during a netlink_broadcast() or during
2144 * early boot for call_usermodehelper(). For now treat these
2145 * errors as non-fatal.
2147 printk(KERN_ERR
"cfg80211: kobject_uevent_env() was unable "
2148 "to call CRDA during init");
2149 #ifdef CONFIG_CFG80211_REG_DEBUG
2150 /* We want to find out exactly why when debugging */
2158 void regulatory_exit(void)
2160 struct regulatory_request
*reg_request
, *tmp
;
2161 struct reg_beacon
*reg_beacon
, *btmp
;
2163 cancel_work_sync(®_work
);
2165 mutex_lock(&cfg80211_mutex
);
2169 kfree(country_ie_regdomain
);
2170 country_ie_regdomain
= NULL
;
2172 kfree(last_request
);
2174 platform_device_unregister(reg_pdev
);
2176 spin_lock_bh(®_pending_beacons_lock
);
2177 if (!list_empty(®_pending_beacons
)) {
2178 list_for_each_entry_safe(reg_beacon
, btmp
,
2179 ®_pending_beacons
, list
) {
2180 list_del(®_beacon
->list
);
2184 spin_unlock_bh(®_pending_beacons_lock
);
2186 if (!list_empty(®_beacon_list
)) {
2187 list_for_each_entry_safe(reg_beacon
, btmp
,
2188 ®_beacon_list
, list
) {
2189 list_del(®_beacon
->list
);
2194 spin_lock(®_requests_lock
);
2195 if (!list_empty(®_requests_list
)) {
2196 list_for_each_entry_safe(reg_request
, tmp
,
2197 ®_requests_list
, list
) {
2198 list_del(®_request
->list
);
2202 spin_unlock(®_requests_lock
);
2204 mutex_unlock(&cfg80211_mutex
);