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
[] = {
57 /* Central wireless core regulatory domains, we only need two,
58 * the current one and a world regulatory domain in case we have no
59 * information to give us an alpha2 */
60 const struct ieee80211_regdomain
*cfg80211_regdomain
;
62 /* We use this as a place for the rd structure built from the
63 * last parsed country IE to rest until CRDA gets back to us with
64 * what it thinks should apply for the same country */
65 static const struct ieee80211_regdomain
*country_ie_regdomain
;
67 /* We keep a static world regulatory domain in case of the absence of CRDA */
68 static const struct ieee80211_regdomain world_regdom
= {
72 REG_RULE(2412-10, 2462+10, 40, 6, 20,
73 NL80211_RRF_PASSIVE_SCAN
|
78 static const struct ieee80211_regdomain
*cfg80211_world_regdom
=
81 #ifdef CONFIG_WIRELESS_OLD_REGULATORY
82 static char *ieee80211_regdom
= "US";
83 module_param(ieee80211_regdom
, charp
, 0444);
84 MODULE_PARM_DESC(ieee80211_regdom
, "IEEE 802.11 regulatory domain code");
86 /* We assume 40 MHz bandwidth for the old regulatory work.
87 * We make emphasis we are using the exact same frequencies
90 static const struct ieee80211_regdomain us_regdom
= {
94 /* IEEE 802.11b/g, channels 1..11 */
95 REG_RULE(2412-10, 2462+10, 40, 6, 27, 0),
96 /* IEEE 802.11a, channel 36 */
97 REG_RULE(5180-10, 5180+10, 40, 6, 23, 0),
98 /* IEEE 802.11a, channel 40 */
99 REG_RULE(5200-10, 5200+10, 40, 6, 23, 0),
100 /* IEEE 802.11a, channel 44 */
101 REG_RULE(5220-10, 5220+10, 40, 6, 23, 0),
102 /* IEEE 802.11a, channels 48..64 */
103 REG_RULE(5240-10, 5320+10, 40, 6, 23, 0),
104 /* IEEE 802.11a, channels 149..165, outdoor */
105 REG_RULE(5745-10, 5825+10, 40, 6, 30, 0),
109 static const struct ieee80211_regdomain jp_regdom
= {
113 /* IEEE 802.11b/g, channels 1..14 */
114 REG_RULE(2412-10, 2484+10, 40, 6, 20, 0),
115 /* IEEE 802.11a, channels 34..48 */
116 REG_RULE(5170-10, 5240+10, 40, 6, 20,
117 NL80211_RRF_PASSIVE_SCAN
),
118 /* IEEE 802.11a, channels 52..64 */
119 REG_RULE(5260-10, 5320+10, 40, 6, 20,
120 NL80211_RRF_NO_IBSS
|
125 static const struct ieee80211_regdomain eu_regdom
= {
127 /* This alpha2 is bogus, we leave it here just for stupid
128 * backward compatibility */
131 /* IEEE 802.11b/g, channels 1..13 */
132 REG_RULE(2412-10, 2472+10, 40, 6, 20, 0),
133 /* IEEE 802.11a, channel 36 */
134 REG_RULE(5180-10, 5180+10, 40, 6, 23,
135 NL80211_RRF_PASSIVE_SCAN
),
136 /* IEEE 802.11a, channel 40 */
137 REG_RULE(5200-10, 5200+10, 40, 6, 23,
138 NL80211_RRF_PASSIVE_SCAN
),
139 /* IEEE 802.11a, channel 44 */
140 REG_RULE(5220-10, 5220+10, 40, 6, 23,
141 NL80211_RRF_PASSIVE_SCAN
),
142 /* IEEE 802.11a, channels 48..64 */
143 REG_RULE(5240-10, 5320+10, 40, 6, 20,
144 NL80211_RRF_NO_IBSS
|
146 /* IEEE 802.11a, channels 100..140 */
147 REG_RULE(5500-10, 5700+10, 40, 6, 30,
148 NL80211_RRF_NO_IBSS
|
153 static const struct ieee80211_regdomain
*static_regdom(char *alpha2
)
155 if (alpha2
[0] == 'U' && alpha2
[1] == 'S')
157 if (alpha2
[0] == 'J' && alpha2
[1] == 'P')
159 if (alpha2
[0] == 'E' && alpha2
[1] == 'U')
161 /* Default, as per the old rules */
165 static bool is_old_static_regdom(const struct ieee80211_regdomain
*rd
)
167 if (rd
== &us_regdom
|| rd
== &jp_regdom
|| rd
== &eu_regdom
)
172 static inline bool is_old_static_regdom(const struct ieee80211_regdomain
*rd
)
178 static void reset_regdomains(void)
180 /* avoid freeing static information or freeing something twice */
181 if (cfg80211_regdomain
== cfg80211_world_regdom
)
182 cfg80211_regdomain
= NULL
;
183 if (cfg80211_world_regdom
== &world_regdom
)
184 cfg80211_world_regdom
= NULL
;
185 if (cfg80211_regdomain
== &world_regdom
)
186 cfg80211_regdomain
= NULL
;
187 if (is_old_static_regdom(cfg80211_regdomain
))
188 cfg80211_regdomain
= NULL
;
190 kfree(cfg80211_regdomain
);
191 kfree(cfg80211_world_regdom
);
193 cfg80211_world_regdom
= &world_regdom
;
194 cfg80211_regdomain
= NULL
;
197 /* Dynamic world regulatory domain requested by the wireless
198 * core upon initialization */
199 static void update_world_regdomain(const struct ieee80211_regdomain
*rd
)
201 BUG_ON(!last_request
);
205 cfg80211_world_regdom
= rd
;
206 cfg80211_regdomain
= rd
;
209 bool is_world_regdom(const char *alpha2
)
213 if (alpha2
[0] == '0' && alpha2
[1] == '0')
218 static bool is_alpha2_set(const char *alpha2
)
222 if (alpha2
[0] != 0 && alpha2
[1] != 0)
227 static bool is_alpha_upper(char letter
)
230 if (letter
>= 65 && letter
<= 90)
235 static bool is_unknown_alpha2(const char *alpha2
)
239 /* Special case where regulatory domain was built by driver
240 * but a specific alpha2 cannot be determined */
241 if (alpha2
[0] == '9' && alpha2
[1] == '9')
246 static bool is_intersected_alpha2(const char *alpha2
)
250 /* Special case where regulatory domain is the
251 * result of an intersection between two regulatory domain
253 if (alpha2
[0] == '9' && alpha2
[1] == '8')
258 static bool is_an_alpha2(const char *alpha2
)
262 if (is_alpha_upper(alpha2
[0]) && is_alpha_upper(alpha2
[1]))
267 static bool alpha2_equal(const char *alpha2_x
, const char *alpha2_y
)
269 if (!alpha2_x
|| !alpha2_y
)
271 if (alpha2_x
[0] == alpha2_y
[0] &&
272 alpha2_x
[1] == alpha2_y
[1])
277 static bool regdom_changed(const char *alpha2
)
279 assert_cfg80211_lock();
281 if (!cfg80211_regdomain
)
283 if (alpha2_equal(cfg80211_regdomain
->alpha2
, alpha2
))
289 * country_ie_integrity_changes - tells us if the country IE has changed
290 * @checksum: checksum of country IE of fields we are interested in
292 * If the country IE has not changed you can ignore it safely. This is
293 * useful to determine if two devices are seeing two different country IEs
294 * even on the same alpha2. Note that this will return false if no IE has
295 * been set on the wireless core yet.
297 static bool country_ie_integrity_changes(u32 checksum
)
299 /* If no IE has been set then the checksum doesn't change */
300 if (unlikely(!last_request
->country_ie_checksum
))
302 if (unlikely(last_request
->country_ie_checksum
!= checksum
))
307 /* This lets us keep regulatory code which is updated on a regulatory
308 * basis in userspace. */
309 static int call_crda(const char *alpha2
)
311 char country_env
[9 + 2] = "COUNTRY=";
317 if (!is_world_regdom((char *) alpha2
))
318 printk(KERN_INFO
"cfg80211: Calling CRDA for country: %c%c\n",
319 alpha2
[0], alpha2
[1]);
321 printk(KERN_INFO
"cfg80211: Calling CRDA to update world "
322 "regulatory domain\n");
324 country_env
[8] = alpha2
[0];
325 country_env
[9] = alpha2
[1];
327 return kobject_uevent_env(®_pdev
->dev
.kobj
, KOBJ_CHANGE
, envp
);
330 /* Used by nl80211 before kmalloc'ing our regulatory domain */
331 bool reg_is_valid_request(const char *alpha2
)
336 return alpha2_equal(last_request
->alpha2
, alpha2
);
339 /* Sanity check on a regulatory rule */
340 static bool is_valid_reg_rule(const struct ieee80211_reg_rule
*rule
)
342 const struct ieee80211_freq_range
*freq_range
= &rule
->freq_range
;
345 if (freq_range
->start_freq_khz
<= 0 || freq_range
->end_freq_khz
<= 0)
348 if (freq_range
->start_freq_khz
> freq_range
->end_freq_khz
)
351 freq_diff
= freq_range
->end_freq_khz
- freq_range
->start_freq_khz
;
353 if (freq_diff
<= 0 || freq_range
->max_bandwidth_khz
> freq_diff
)
359 static bool is_valid_rd(const struct ieee80211_regdomain
*rd
)
361 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
364 if (!rd
->n_reg_rules
)
367 if (WARN_ON(rd
->n_reg_rules
> NL80211_MAX_SUPP_REG_RULES
))
370 for (i
= 0; i
< rd
->n_reg_rules
; i
++) {
371 reg_rule
= &rd
->reg_rules
[i
];
372 if (!is_valid_reg_rule(reg_rule
))
379 /* Returns value in KHz */
380 static u32
freq_max_bandwidth(const struct ieee80211_freq_range
*freq_range
,
384 for (i
= 0; i
< ARRAY_SIZE(supported_bandwidths
); i
++) {
385 u32 start_freq_khz
= freq
- supported_bandwidths
[i
]/2;
386 u32 end_freq_khz
= freq
+ supported_bandwidths
[i
]/2;
387 if (start_freq_khz
>= freq_range
->start_freq_khz
&&
388 end_freq_khz
<= freq_range
->end_freq_khz
)
389 return supported_bandwidths
[i
];
395 * freq_in_rule_band - tells us if a frequency is in a frequency band
396 * @freq_range: frequency rule we want to query
397 * @freq_khz: frequency we are inquiring about
399 * This lets us know if a specific frequency rule is or is not relevant to
400 * a specific frequency's band. Bands are device specific and artificial
401 * definitions (the "2.4 GHz band" and the "5 GHz band"), however it is
402 * safe for now to assume that a frequency rule should not be part of a
403 * frequency's band if the start freq or end freq are off by more than 2 GHz.
404 * This resolution can be lowered and should be considered as we add
405 * regulatory rule support for other "bands".
407 static bool freq_in_rule_band(const struct ieee80211_freq_range
*freq_range
,
410 #define ONE_GHZ_IN_KHZ 1000000
411 if (abs(freq_khz
- freq_range
->start_freq_khz
) <= (2 * ONE_GHZ_IN_KHZ
))
413 if (abs(freq_khz
- freq_range
->end_freq_khz
) <= (2 * ONE_GHZ_IN_KHZ
))
416 #undef ONE_GHZ_IN_KHZ
419 /* Converts a country IE to a regulatory domain. A regulatory domain
420 * structure has a lot of information which the IE doesn't yet have,
421 * so for the other values we use upper max values as we will intersect
422 * with our userspace regulatory agent to get lower bounds. */
423 static struct ieee80211_regdomain
*country_ie_2_rd(
428 struct ieee80211_regdomain
*rd
= NULL
;
432 u32 num_rules
= 0, size_of_regd
= 0;
433 u8
*triplets_start
= NULL
;
434 u8 len_at_triplet
= 0;
435 /* the last channel we have registered in a subband (triplet) */
436 int last_sub_max_channel
= 0;
438 *checksum
= 0xDEADBEEF;
440 /* Country IE requirements */
441 BUG_ON(country_ie_len
< IEEE80211_COUNTRY_IE_MIN_LEN
||
442 country_ie_len
& 0x01);
444 alpha2
[0] = country_ie
[0];
445 alpha2
[1] = country_ie
[1];
448 * Third octet can be:
452 * anything else we assume is no restrictions
454 if (country_ie
[2] == 'I')
455 flags
= NL80211_RRF_NO_OUTDOOR
;
456 else if (country_ie
[2] == 'O')
457 flags
= NL80211_RRF_NO_INDOOR
;
462 triplets_start
= country_ie
;
463 len_at_triplet
= country_ie_len
;
465 *checksum
^= ((flags
^ alpha2
[0] ^ alpha2
[1]) << 8);
467 /* We need to build a reg rule for each triplet, but first we must
468 * calculate the number of reg rules we will need. We will need one
469 * for each channel subband */
470 while (country_ie_len
>= 3) {
472 struct ieee80211_country_ie_triplet
*triplet
=
473 (struct ieee80211_country_ie_triplet
*) country_ie
;
474 int cur_sub_max_channel
= 0, cur_channel
= 0;
476 if (triplet
->ext
.reg_extension_id
>=
477 IEEE80211_COUNTRY_EXTENSION_ID
) {
484 if (triplet
->chans
.first_channel
<= 14)
485 end_channel
= triplet
->chans
.first_channel
+
486 triplet
->chans
.num_channels
;
489 * 5 GHz -- For example in country IEs if the first
490 * channel given is 36 and the number of channels is 4
491 * then the individual channel numbers defined for the
492 * 5 GHz PHY by these parameters are: 36, 40, 44, and 48
493 * and not 36, 37, 38, 39.
495 * See: http://tinyurl.com/11d-clarification
497 end_channel
= triplet
->chans
.first_channel
+
498 (4 * (triplet
->chans
.num_channels
- 1));
500 cur_channel
= triplet
->chans
.first_channel
;
501 cur_sub_max_channel
= end_channel
;
503 /* Basic sanity check */
504 if (cur_sub_max_channel
< cur_channel
)
507 /* Do not allow overlapping channels. Also channels
508 * passed in each subband must be monotonically
510 if (last_sub_max_channel
) {
511 if (cur_channel
<= last_sub_max_channel
)
513 if (cur_sub_max_channel
<= last_sub_max_channel
)
517 /* When dot11RegulatoryClassesRequired is supported
518 * we can throw ext triplets as part of this soup,
519 * for now we don't care when those change as we
520 * don't support them */
521 *checksum
^= ((cur_channel
^ cur_sub_max_channel
) << 8) |
522 ((cur_sub_max_channel
^ cur_sub_max_channel
) << 16) |
523 ((triplet
->chans
.max_power
^ cur_sub_max_channel
) << 24);
525 last_sub_max_channel
= cur_sub_max_channel
;
531 /* Note: this is not a IEEE requirement but
532 * simply a memory requirement */
533 if (num_rules
> NL80211_MAX_SUPP_REG_RULES
)
537 country_ie
= triplets_start
;
538 country_ie_len
= len_at_triplet
;
540 size_of_regd
= sizeof(struct ieee80211_regdomain
) +
541 (num_rules
* sizeof(struct ieee80211_reg_rule
));
543 rd
= kzalloc(size_of_regd
, GFP_KERNEL
);
547 rd
->n_reg_rules
= num_rules
;
548 rd
->alpha2
[0] = alpha2
[0];
549 rd
->alpha2
[1] = alpha2
[1];
551 /* This time around we fill in the rd */
552 while (country_ie_len
>= 3) {
554 struct ieee80211_country_ie_triplet
*triplet
=
555 (struct ieee80211_country_ie_triplet
*) country_ie
;
556 struct ieee80211_reg_rule
*reg_rule
= NULL
;
557 struct ieee80211_freq_range
*freq_range
= NULL
;
558 struct ieee80211_power_rule
*power_rule
= NULL
;
560 /* Must parse if dot11RegulatoryClassesRequired is true,
561 * we don't support this yet */
562 if (triplet
->ext
.reg_extension_id
>=
563 IEEE80211_COUNTRY_EXTENSION_ID
) {
569 reg_rule
= &rd
->reg_rules
[i
];
570 freq_range
= ®_rule
->freq_range
;
571 power_rule
= ®_rule
->power_rule
;
573 reg_rule
->flags
= flags
;
576 if (triplet
->chans
.first_channel
<= 14)
577 end_channel
= triplet
->chans
.first_channel
+
578 triplet
->chans
.num_channels
;
580 end_channel
= triplet
->chans
.first_channel
+
581 (4 * (triplet
->chans
.num_channels
- 1));
583 /* The +10 is since the regulatory domain expects
584 * the actual band edge, not the center of freq for
585 * its start and end freqs, assuming 20 MHz bandwidth on
586 * the channels passed */
587 freq_range
->start_freq_khz
=
588 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
589 triplet
->chans
.first_channel
) - 10);
590 freq_range
->end_freq_khz
=
591 MHZ_TO_KHZ(ieee80211_channel_to_frequency(
594 /* Large arbitrary values, we intersect later */
595 /* Increment this if we ever support >= 40 MHz channels
597 freq_range
->max_bandwidth_khz
= MHZ_TO_KHZ(40);
598 power_rule
->max_antenna_gain
= DBI_TO_MBI(100);
599 power_rule
->max_eirp
= DBM_TO_MBM(100);
605 BUG_ON(i
> NL80211_MAX_SUPP_REG_RULES
);
612 /* Helper for regdom_intersect(), this does the real
613 * mathematical intersection fun */
614 static int reg_rules_intersect(
615 const struct ieee80211_reg_rule
*rule1
,
616 const struct ieee80211_reg_rule
*rule2
,
617 struct ieee80211_reg_rule
*intersected_rule
)
619 const struct ieee80211_freq_range
*freq_range1
, *freq_range2
;
620 struct ieee80211_freq_range
*freq_range
;
621 const struct ieee80211_power_rule
*power_rule1
, *power_rule2
;
622 struct ieee80211_power_rule
*power_rule
;
625 freq_range1
= &rule1
->freq_range
;
626 freq_range2
= &rule2
->freq_range
;
627 freq_range
= &intersected_rule
->freq_range
;
629 power_rule1
= &rule1
->power_rule
;
630 power_rule2
= &rule2
->power_rule
;
631 power_rule
= &intersected_rule
->power_rule
;
633 freq_range
->start_freq_khz
= max(freq_range1
->start_freq_khz
,
634 freq_range2
->start_freq_khz
);
635 freq_range
->end_freq_khz
= min(freq_range1
->end_freq_khz
,
636 freq_range2
->end_freq_khz
);
637 freq_range
->max_bandwidth_khz
= min(freq_range1
->max_bandwidth_khz
,
638 freq_range2
->max_bandwidth_khz
);
640 freq_diff
= freq_range
->end_freq_khz
- freq_range
->start_freq_khz
;
641 if (freq_range
->max_bandwidth_khz
> freq_diff
)
642 freq_range
->max_bandwidth_khz
= freq_diff
;
644 power_rule
->max_eirp
= min(power_rule1
->max_eirp
,
645 power_rule2
->max_eirp
);
646 power_rule
->max_antenna_gain
= min(power_rule1
->max_antenna_gain
,
647 power_rule2
->max_antenna_gain
);
649 intersected_rule
->flags
= (rule1
->flags
| rule2
->flags
);
651 if (!is_valid_reg_rule(intersected_rule
))
658 * regdom_intersect - do the intersection between two regulatory domains
659 * @rd1: first regulatory domain
660 * @rd2: second regulatory domain
662 * Use this function to get the intersection between two regulatory domains.
663 * Once completed we will mark the alpha2 for the rd as intersected, "98",
664 * as no one single alpha2 can represent this regulatory domain.
666 * Returns a pointer to the regulatory domain structure which will hold the
667 * resulting intersection of rules between rd1 and rd2. We will
668 * kzalloc() this structure for you.
670 static struct ieee80211_regdomain
*regdom_intersect(
671 const struct ieee80211_regdomain
*rd1
,
672 const struct ieee80211_regdomain
*rd2
)
676 unsigned int num_rules
= 0, rule_idx
= 0;
677 const struct ieee80211_reg_rule
*rule1
, *rule2
;
678 struct ieee80211_reg_rule
*intersected_rule
;
679 struct ieee80211_regdomain
*rd
;
680 /* This is just a dummy holder to help us count */
681 struct ieee80211_reg_rule irule
;
683 /* Uses the stack temporarily for counter arithmetic */
684 intersected_rule
= &irule
;
686 memset(intersected_rule
, 0, sizeof(struct ieee80211_reg_rule
));
691 /* First we get a count of the rules we'll need, then we actually
692 * build them. This is to so we can malloc() and free() a
693 * regdomain once. The reason we use reg_rules_intersect() here
694 * is it will return -EINVAL if the rule computed makes no sense.
695 * All rules that do check out OK are valid. */
697 for (x
= 0; x
< rd1
->n_reg_rules
; x
++) {
698 rule1
= &rd1
->reg_rules
[x
];
699 for (y
= 0; y
< rd2
->n_reg_rules
; y
++) {
700 rule2
= &rd2
->reg_rules
[y
];
701 if (!reg_rules_intersect(rule1
, rule2
,
704 memset(intersected_rule
, 0,
705 sizeof(struct ieee80211_reg_rule
));
712 size_of_regd
= sizeof(struct ieee80211_regdomain
) +
713 ((num_rules
+ 1) * sizeof(struct ieee80211_reg_rule
));
715 rd
= kzalloc(size_of_regd
, GFP_KERNEL
);
719 for (x
= 0; x
< rd1
->n_reg_rules
; x
++) {
720 rule1
= &rd1
->reg_rules
[x
];
721 for (y
= 0; y
< rd2
->n_reg_rules
; y
++) {
722 rule2
= &rd2
->reg_rules
[y
];
723 /* This time around instead of using the stack lets
724 * write to the target rule directly saving ourselves
726 intersected_rule
= &rd
->reg_rules
[rule_idx
];
727 r
= reg_rules_intersect(rule1
, rule2
,
729 /* No need to memset here the intersected rule here as
730 * we're not using the stack anymore */
737 if (rule_idx
!= num_rules
) {
742 rd
->n_reg_rules
= num_rules
;
749 /* XXX: add support for the rest of enum nl80211_reg_rule_flags, we may
750 * want to just have the channel structure use these */
751 static u32
map_regdom_flags(u32 rd_flags
)
753 u32 channel_flags
= 0;
754 if (rd_flags
& NL80211_RRF_PASSIVE_SCAN
)
755 channel_flags
|= IEEE80211_CHAN_PASSIVE_SCAN
;
756 if (rd_flags
& NL80211_RRF_NO_IBSS
)
757 channel_flags
|= IEEE80211_CHAN_NO_IBSS
;
758 if (rd_flags
& NL80211_RRF_DFS
)
759 channel_flags
|= IEEE80211_CHAN_RADAR
;
760 return channel_flags
;
763 static int freq_reg_info_regd(struct wiphy
*wiphy
,
766 const struct ieee80211_reg_rule
**reg_rule
,
767 const struct ieee80211_regdomain
*custom_regd
)
770 bool band_rule_found
= false;
771 const struct ieee80211_regdomain
*regd
;
772 u32 max_bandwidth
= 0;
774 regd
= custom_regd
? custom_regd
: cfg80211_regdomain
;
776 /* Follow the driver's regulatory domain, if present, unless a country
777 * IE has been processed or a user wants to help complaince further */
778 if (last_request
->initiator
!= REGDOM_SET_BY_COUNTRY_IE
&&
779 last_request
->initiator
!= REGDOM_SET_BY_USER
&&
786 for (i
= 0; i
< regd
->n_reg_rules
; i
++) {
787 const struct ieee80211_reg_rule
*rr
;
788 const struct ieee80211_freq_range
*fr
= NULL
;
789 const struct ieee80211_power_rule
*pr
= NULL
;
791 rr
= ®d
->reg_rules
[i
];
792 fr
= &rr
->freq_range
;
793 pr
= &rr
->power_rule
;
795 /* We only need to know if one frequency rule was
796 * was in center_freq's band, that's enough, so lets
797 * not overwrite it once found */
798 if (!band_rule_found
)
799 band_rule_found
= freq_in_rule_band(fr
, center_freq
);
801 max_bandwidth
= freq_max_bandwidth(fr
, center_freq
);
803 if (max_bandwidth
&& *bandwidth
<= max_bandwidth
) {
805 *bandwidth
= max_bandwidth
;
810 if (!band_rule_found
)
813 return !max_bandwidth
;
815 EXPORT_SYMBOL(freq_reg_info
);
817 int freq_reg_info(struct wiphy
*wiphy
, u32 center_freq
, u32
*bandwidth
,
818 const struct ieee80211_reg_rule
**reg_rule
)
820 return freq_reg_info_regd(wiphy
, center_freq
,
821 bandwidth
, reg_rule
, NULL
);
824 static void handle_channel(struct wiphy
*wiphy
, enum ieee80211_band band
,
825 unsigned int chan_idx
)
829 u32 max_bandwidth
= 0;
830 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
831 const struct ieee80211_power_rule
*power_rule
= NULL
;
832 struct ieee80211_supported_band
*sband
;
833 struct ieee80211_channel
*chan
;
834 struct wiphy
*request_wiphy
;
836 assert_cfg80211_lock();
838 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
840 sband
= wiphy
->bands
[band
];
841 BUG_ON(chan_idx
>= sband
->n_channels
);
842 chan
= &sband
->channels
[chan_idx
];
844 flags
= chan
->orig_flags
;
846 r
= freq_reg_info(wiphy
, MHZ_TO_KHZ(chan
->center_freq
),
847 &max_bandwidth
, ®_rule
);
850 /* This means no regulatory rule was found in the country IE
851 * with a frequency range on the center_freq's band, since
852 * IEEE-802.11 allows for a country IE to have a subset of the
853 * regulatory information provided in a country we ignore
854 * disabling the channel unless at least one reg rule was
855 * found on the center_freq's band. For details see this
858 * http://tinyurl.com/11d-clarification
861 last_request
->initiator
== REGDOM_SET_BY_COUNTRY_IE
) {
862 #ifdef CONFIG_CFG80211_REG_DEBUG
863 printk(KERN_DEBUG
"cfg80211: Leaving channel %d MHz "
864 "intact on %s - no rule found in band on "
866 chan
->center_freq
, wiphy_name(wiphy
));
869 /* In this case we know the country IE has at least one reg rule
870 * for the band so we respect its band definitions */
871 #ifdef CONFIG_CFG80211_REG_DEBUG
872 if (last_request
->initiator
== REGDOM_SET_BY_COUNTRY_IE
)
873 printk(KERN_DEBUG
"cfg80211: Disabling "
874 "channel %d MHz on %s due to "
876 chan
->center_freq
, wiphy_name(wiphy
));
878 flags
|= IEEE80211_CHAN_DISABLED
;
884 power_rule
= ®_rule
->power_rule
;
886 if (last_request
->initiator
== REGDOM_SET_BY_DRIVER
&&
887 request_wiphy
&& request_wiphy
== wiphy
&&
888 request_wiphy
->strict_regulatory
) {
889 /* This gaurantees the driver's requested regulatory domain
890 * will always be used as a base for further regulatory
892 chan
->flags
= chan
->orig_flags
=
893 map_regdom_flags(reg_rule
->flags
);
894 chan
->max_antenna_gain
= chan
->orig_mag
=
895 (int) MBI_TO_DBI(power_rule
->max_antenna_gain
);
896 chan
->max_bandwidth
= KHZ_TO_MHZ(max_bandwidth
);
897 chan
->max_power
= chan
->orig_mpwr
=
898 (int) MBM_TO_DBM(power_rule
->max_eirp
);
902 chan
->flags
= flags
| map_regdom_flags(reg_rule
->flags
);
903 chan
->max_antenna_gain
= min(chan
->orig_mag
,
904 (int) MBI_TO_DBI(power_rule
->max_antenna_gain
));
905 chan
->max_bandwidth
= KHZ_TO_MHZ(max_bandwidth
);
907 chan
->max_power
= min(chan
->orig_mpwr
,
908 (int) MBM_TO_DBM(power_rule
->max_eirp
));
910 chan
->max_power
= (int) MBM_TO_DBM(power_rule
->max_eirp
);
913 static void handle_band(struct wiphy
*wiphy
, enum ieee80211_band band
)
916 struct ieee80211_supported_band
*sband
;
918 BUG_ON(!wiphy
->bands
[band
]);
919 sband
= wiphy
->bands
[band
];
921 for (i
= 0; i
< sband
->n_channels
; i
++)
922 handle_channel(wiphy
, band
, i
);
925 static bool ignore_reg_update(struct wiphy
*wiphy
, enum reg_set_by setby
)
929 if (setby
== REGDOM_SET_BY_CORE
&&
930 wiphy
->custom_regulatory
)
932 /* wiphy->regd will be set once the device has its own
933 * desired regulatory domain set */
934 if (wiphy
->strict_regulatory
&& !wiphy
->regd
&&
935 !is_world_regdom(last_request
->alpha2
))
940 static void update_all_wiphy_regulatory(enum reg_set_by setby
)
942 struct cfg80211_registered_device
*drv
;
944 list_for_each_entry(drv
, &cfg80211_drv_list
, list
)
945 wiphy_update_regulatory(&drv
->wiphy
, setby
);
948 void wiphy_update_regulatory(struct wiphy
*wiphy
, enum reg_set_by setby
)
950 enum ieee80211_band band
;
952 if (ignore_reg_update(wiphy
, setby
))
954 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
955 if (wiphy
->bands
[band
])
956 handle_band(wiphy
, band
);
958 if (wiphy
->reg_notifier
)
959 wiphy
->reg_notifier(wiphy
, last_request
);
962 static void handle_channel_custom(struct wiphy
*wiphy
,
963 enum ieee80211_band band
,
964 unsigned int chan_idx
,
965 const struct ieee80211_regdomain
*regd
)
968 u32 max_bandwidth
= 0;
969 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
970 const struct ieee80211_power_rule
*power_rule
= NULL
;
971 struct ieee80211_supported_band
*sband
;
972 struct ieee80211_channel
*chan
;
974 sband
= wiphy
->bands
[band
];
975 BUG_ON(chan_idx
>= sband
->n_channels
);
976 chan
= &sband
->channels
[chan_idx
];
978 r
= freq_reg_info_regd(wiphy
, MHZ_TO_KHZ(chan
->center_freq
),
979 &max_bandwidth
, ®_rule
, regd
);
982 chan
->flags
= IEEE80211_CHAN_DISABLED
;
986 power_rule
= ®_rule
->power_rule
;
988 chan
->flags
|= map_regdom_flags(reg_rule
->flags
);
989 chan
->max_antenna_gain
= (int) MBI_TO_DBI(power_rule
->max_antenna_gain
);
990 chan
->max_bandwidth
= KHZ_TO_MHZ(max_bandwidth
);
991 chan
->max_power
= (int) MBM_TO_DBM(power_rule
->max_eirp
);
994 static void handle_band_custom(struct wiphy
*wiphy
, enum ieee80211_band band
,
995 const struct ieee80211_regdomain
*regd
)
998 struct ieee80211_supported_band
*sband
;
1000 BUG_ON(!wiphy
->bands
[band
]);
1001 sband
= wiphy
->bands
[band
];
1003 for (i
= 0; i
< sband
->n_channels
; i
++)
1004 handle_channel_custom(wiphy
, band
, i
, regd
);
1007 /* Used by drivers prior to wiphy registration */
1008 void wiphy_apply_custom_regulatory(struct wiphy
*wiphy
,
1009 const struct ieee80211_regdomain
*regd
)
1011 enum ieee80211_band band
;
1012 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
1013 if (wiphy
->bands
[band
])
1014 handle_band_custom(wiphy
, band
, regd
);
1017 EXPORT_SYMBOL(wiphy_apply_custom_regulatory
);
1019 static int reg_copy_regd(const struct ieee80211_regdomain
**dst_regd
,
1020 const struct ieee80211_regdomain
*src_regd
)
1022 struct ieee80211_regdomain
*regd
;
1023 int size_of_regd
= 0;
1026 size_of_regd
= sizeof(struct ieee80211_regdomain
) +
1027 ((src_regd
->n_reg_rules
+ 1) * sizeof(struct ieee80211_reg_rule
));
1029 regd
= kzalloc(size_of_regd
, GFP_KERNEL
);
1033 memcpy(regd
, src_regd
, sizeof(struct ieee80211_regdomain
));
1035 for (i
= 0; i
< src_regd
->n_reg_rules
; i
++)
1036 memcpy(®d
->reg_rules
[i
], &src_regd
->reg_rules
[i
],
1037 sizeof(struct ieee80211_reg_rule
));
1043 /* Return value which can be used by ignore_request() to indicate
1044 * it has been determined we should intersect two regulatory domains */
1045 #define REG_INTERSECT 1
1047 /* This has the logic which determines when a new request
1048 * should be ignored. */
1049 static int ignore_request(struct wiphy
*wiphy
, enum reg_set_by set_by
,
1052 struct wiphy
*last_wiphy
= NULL
;
1054 assert_cfg80211_lock();
1056 /* All initial requests are respected */
1061 case REGDOM_SET_BY_INIT
:
1063 case REGDOM_SET_BY_CORE
:
1065 case REGDOM_SET_BY_COUNTRY_IE
:
1067 last_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
1069 if (unlikely(!is_an_alpha2(alpha2
)))
1071 if (last_request
->initiator
== REGDOM_SET_BY_COUNTRY_IE
) {
1072 if (last_wiphy
!= wiphy
) {
1074 * Two cards with two APs claiming different
1075 * different Country IE alpha2s. We could
1076 * intersect them, but that seems unlikely
1077 * to be correct. Reject second one for now.
1079 if (!alpha2_equal(alpha2
,
1080 cfg80211_regdomain
->alpha2
))
1084 /* Two consecutive Country IE hints on the same wiphy.
1085 * This should be picked up early by the driver/stack */
1086 if (WARN_ON(!alpha2_equal(cfg80211_regdomain
->alpha2
,
1091 return REG_INTERSECT
;
1092 case REGDOM_SET_BY_DRIVER
:
1093 if (last_request
->initiator
== REGDOM_SET_BY_CORE
) {
1094 if (is_old_static_regdom(cfg80211_regdomain
))
1096 if (!alpha2_equal(cfg80211_regdomain
->alpha2
, alpha2
))
1100 return REG_INTERSECT
;
1101 case REGDOM_SET_BY_USER
:
1102 if (last_request
->initiator
== REGDOM_SET_BY_COUNTRY_IE
)
1103 return REG_INTERSECT
;
1104 /* If the user knows better the user should set the regdom
1105 * to their country before the IE is picked up */
1106 if (last_request
->initiator
== REGDOM_SET_BY_USER
&&
1107 last_request
->intersect
)
1109 /* Process user requests only after previous user/driver/core
1110 * requests have been processed */
1111 if (last_request
->initiator
== REGDOM_SET_BY_CORE
||
1112 last_request
->initiator
== REGDOM_SET_BY_DRIVER
||
1113 last_request
->initiator
== REGDOM_SET_BY_USER
) {
1114 if (!alpha2_equal(last_request
->alpha2
,
1115 cfg80211_regdomain
->alpha2
))
1119 if (!is_old_static_regdom(cfg80211_regdomain
) &&
1120 alpha2_equal(cfg80211_regdomain
->alpha2
, alpha2
))
1129 /* Caller must hold &cfg80211_mutex */
1130 int __regulatory_hint(struct wiphy
*wiphy
, enum reg_set_by set_by
,
1132 u32 country_ie_checksum
,
1133 enum environment_cap env
)
1135 struct regulatory_request
*request
;
1136 bool intersect
= false;
1139 assert_cfg80211_lock();
1141 r
= ignore_request(wiphy
, set_by
, alpha2
);
1143 if (r
== REG_INTERSECT
) {
1144 if (set_by
== REGDOM_SET_BY_DRIVER
) {
1145 r
= reg_copy_regd(&wiphy
->regd
, cfg80211_regdomain
);
1151 /* If the regulatory domain being requested by the
1152 * driver has already been set just copy it to the
1154 if (r
== -EALREADY
&& set_by
== REGDOM_SET_BY_DRIVER
) {
1155 r
= reg_copy_regd(&wiphy
->regd
, cfg80211_regdomain
);
1165 request
= kzalloc(sizeof(struct regulatory_request
),
1170 request
->alpha2
[0] = alpha2
[0];
1171 request
->alpha2
[1] = alpha2
[1];
1172 request
->initiator
= set_by
;
1173 request
->wiphy_idx
= get_wiphy_idx(wiphy
);
1174 request
->intersect
= intersect
;
1175 request
->country_ie_checksum
= country_ie_checksum
;
1176 request
->country_ie_env
= env
;
1178 kfree(last_request
);
1179 last_request
= request
;
1181 /* When r == REG_INTERSECT we do need to call CRDA */
1186 * Note: When CONFIG_WIRELESS_OLD_REGULATORY is enabled
1187 * AND if CRDA is NOT present nothing will happen, if someone
1188 * wants to bother with 11d with OLD_REG you can add a timer.
1189 * If after x amount of time nothing happens you can call:
1191 * return set_regdom(country_ie_regdomain);
1193 * to intersect with the static rd
1195 return call_crda(alpha2
);
1198 static int regulatory_hint_core(const char *alpha2
)
1200 struct regulatory_request
*request
;
1202 BUG_ON(last_request
);
1204 request
= kzalloc(sizeof(struct regulatory_request
),
1209 request
->alpha2
[0] = alpha2
[0];
1210 request
->alpha2
[1] = alpha2
[1];
1211 request
->initiator
= REGDOM_SET_BY_CORE
;
1213 last_request
= request
;
1215 return call_crda(alpha2
);
1218 void regulatory_hint(struct wiphy
*wiphy
, const char *alpha2
)
1223 mutex_lock(&cfg80211_mutex
);
1224 r
= __regulatory_hint(wiphy
, REGDOM_SET_BY_DRIVER
,
1225 alpha2
, 0, ENVIRON_ANY
);
1226 /* This is required so that the orig_* parameters are saved */
1227 if (r
== -EALREADY
&& wiphy
->strict_regulatory
)
1228 wiphy_update_regulatory(wiphy
, REGDOM_SET_BY_DRIVER
);
1229 mutex_unlock(&cfg80211_mutex
);
1231 EXPORT_SYMBOL(regulatory_hint
);
1233 static bool reg_same_country_ie_hint(struct wiphy
*wiphy
,
1234 u32 country_ie_checksum
)
1236 struct wiphy
*request_wiphy
;
1238 assert_cfg80211_lock();
1240 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
1245 if (likely(request_wiphy
!= wiphy
))
1246 return !country_ie_integrity_changes(country_ie_checksum
);
1247 /* We should not have let these through at this point, they
1248 * should have been picked up earlier by the first alpha2 check
1250 if (WARN_ON(!country_ie_integrity_changes(country_ie_checksum
)))
1255 void regulatory_hint_11d(struct wiphy
*wiphy
,
1259 struct ieee80211_regdomain
*rd
= NULL
;
1262 enum environment_cap env
= ENVIRON_ANY
;
1264 mutex_lock(&cfg80211_mutex
);
1266 if (unlikely(!last_request
)) {
1267 mutex_unlock(&cfg80211_mutex
);
1271 /* IE len must be evenly divisible by 2 */
1272 if (country_ie_len
& 0x01)
1275 if (country_ie_len
< IEEE80211_COUNTRY_IE_MIN_LEN
)
1278 /* Pending country IE processing, this can happen after we
1279 * call CRDA and wait for a response if a beacon was received before
1280 * we were able to process the last regulatory_hint_11d() call */
1281 if (country_ie_regdomain
)
1284 alpha2
[0] = country_ie
[0];
1285 alpha2
[1] = country_ie
[1];
1287 if (country_ie
[2] == 'I')
1288 env
= ENVIRON_INDOOR
;
1289 else if (country_ie
[2] == 'O')
1290 env
= ENVIRON_OUTDOOR
;
1292 /* We will run this for *every* beacon processed for the BSSID, so
1293 * we optimize an early check to exit out early if we don't have to
1295 if (likely(wiphy_idx_valid(last_request
->wiphy_idx
))) {
1296 struct cfg80211_registered_device
*drv_last_ie
;
1299 cfg80211_drv_by_wiphy_idx(last_request
->wiphy_idx
);
1301 /* Lets keep this simple -- we trust the first AP
1302 * after we intersect with CRDA */
1303 if (likely(&drv_last_ie
->wiphy
== wiphy
)) {
1304 /* Ignore IEs coming in on this wiphy with
1305 * the same alpha2 and environment cap */
1306 if (likely(alpha2_equal(drv_last_ie
->country_ie_alpha2
,
1308 env
== drv_last_ie
->env
)) {
1311 /* the wiphy moved on to another BSSID or the AP
1312 * was reconfigured. XXX: We need to deal with the
1313 * case where the user suspends and goes to goes
1314 * to another country, and then gets IEs from an
1315 * AP with different settings */
1318 /* Ignore IEs coming in on two separate wiphys with
1319 * the same alpha2 and environment cap */
1320 if (likely(alpha2_equal(drv_last_ie
->country_ie_alpha2
,
1322 env
== drv_last_ie
->env
)) {
1325 /* We could potentially intersect though */
1330 rd
= country_ie_2_rd(country_ie
, country_ie_len
, &checksum
);
1335 * This will not happen right now but we leave it here for the
1336 * the future when we want to add suspend/resume support and having
1337 * the user move to another country after doing so, or having the user
1338 * move to another AP. Right now we just trust the first AP.
1340 * If we hit this before we add this support we want to be informed of
1341 * it as it would indicate a mistake in the current design
1343 if (WARN_ON(reg_same_country_ie_hint(wiphy
, checksum
)))
1346 /* We keep this around for when CRDA comes back with a response so
1347 * we can intersect with that */
1348 country_ie_regdomain
= rd
;
1350 __regulatory_hint(wiphy
, REGDOM_SET_BY_COUNTRY_IE
,
1351 country_ie_regdomain
->alpha2
, checksum
, env
);
1358 mutex_unlock(&cfg80211_mutex
);
1360 EXPORT_SYMBOL(regulatory_hint_11d
);
1362 static void print_rd_rules(const struct ieee80211_regdomain
*rd
)
1365 const struct ieee80211_reg_rule
*reg_rule
= NULL
;
1366 const struct ieee80211_freq_range
*freq_range
= NULL
;
1367 const struct ieee80211_power_rule
*power_rule
= NULL
;
1369 printk(KERN_INFO
"\t(start_freq - end_freq @ bandwidth), "
1370 "(max_antenna_gain, max_eirp)\n");
1372 for (i
= 0; i
< rd
->n_reg_rules
; i
++) {
1373 reg_rule
= &rd
->reg_rules
[i
];
1374 freq_range
= ®_rule
->freq_range
;
1375 power_rule
= ®_rule
->power_rule
;
1377 /* There may not be documentation for max antenna gain
1378 * in certain regions */
1379 if (power_rule
->max_antenna_gain
)
1380 printk(KERN_INFO
"\t(%d KHz - %d KHz @ %d KHz), "
1381 "(%d mBi, %d mBm)\n",
1382 freq_range
->start_freq_khz
,
1383 freq_range
->end_freq_khz
,
1384 freq_range
->max_bandwidth_khz
,
1385 power_rule
->max_antenna_gain
,
1386 power_rule
->max_eirp
);
1388 printk(KERN_INFO
"\t(%d KHz - %d KHz @ %d KHz), "
1390 freq_range
->start_freq_khz
,
1391 freq_range
->end_freq_khz
,
1392 freq_range
->max_bandwidth_khz
,
1393 power_rule
->max_eirp
);
1397 static void print_regdomain(const struct ieee80211_regdomain
*rd
)
1400 if (is_intersected_alpha2(rd
->alpha2
)) {
1402 if (last_request
->initiator
== REGDOM_SET_BY_COUNTRY_IE
) {
1403 struct cfg80211_registered_device
*drv
;
1404 drv
= cfg80211_drv_by_wiphy_idx(
1405 last_request
->wiphy_idx
);
1407 printk(KERN_INFO
"cfg80211: Current regulatory "
1408 "domain updated by AP to: %c%c\n",
1409 drv
->country_ie_alpha2
[0],
1410 drv
->country_ie_alpha2
[1]);
1412 printk(KERN_INFO
"cfg80211: Current regulatory "
1413 "domain intersected: \n");
1415 printk(KERN_INFO
"cfg80211: Current regulatory "
1416 "domain intersected: \n");
1417 } else if (is_world_regdom(rd
->alpha2
))
1418 printk(KERN_INFO
"cfg80211: World regulatory "
1419 "domain updated:\n");
1421 if (is_unknown_alpha2(rd
->alpha2
))
1422 printk(KERN_INFO
"cfg80211: Regulatory domain "
1423 "changed to driver built-in settings "
1424 "(unknown country)\n");
1426 printk(KERN_INFO
"cfg80211: Regulatory domain "
1427 "changed to country: %c%c\n",
1428 rd
->alpha2
[0], rd
->alpha2
[1]);
1433 static void print_regdomain_info(const struct ieee80211_regdomain
*rd
)
1435 printk(KERN_INFO
"cfg80211: Regulatory domain: %c%c\n",
1436 rd
->alpha2
[0], rd
->alpha2
[1]);
1440 #ifdef CONFIG_CFG80211_REG_DEBUG
1441 static void reg_country_ie_process_debug(
1442 const struct ieee80211_regdomain
*rd
,
1443 const struct ieee80211_regdomain
*country_ie_regdomain
,
1444 const struct ieee80211_regdomain
*intersected_rd
)
1446 printk(KERN_DEBUG
"cfg80211: Received country IE:\n");
1447 print_regdomain_info(country_ie_regdomain
);
1448 printk(KERN_DEBUG
"cfg80211: CRDA thinks this should applied:\n");
1449 print_regdomain_info(rd
);
1450 if (intersected_rd
) {
1451 printk(KERN_DEBUG
"cfg80211: We intersect both of these "
1453 print_regdomain_info(intersected_rd
);
1456 printk(KERN_DEBUG
"cfg80211: Intersection between both failed\n");
1459 static inline void reg_country_ie_process_debug(
1460 const struct ieee80211_regdomain
*rd
,
1461 const struct ieee80211_regdomain
*country_ie_regdomain
,
1462 const struct ieee80211_regdomain
*intersected_rd
)
1467 /* Takes ownership of rd only if it doesn't fail */
1468 static int __set_regdom(const struct ieee80211_regdomain
*rd
)
1470 const struct ieee80211_regdomain
*intersected_rd
= NULL
;
1471 struct cfg80211_registered_device
*drv
= NULL
;
1472 struct wiphy
*request_wiphy
;
1473 /* Some basic sanity checks first */
1475 if (is_world_regdom(rd
->alpha2
)) {
1476 if (WARN_ON(!reg_is_valid_request(rd
->alpha2
)))
1478 update_world_regdomain(rd
);
1482 if (!is_alpha2_set(rd
->alpha2
) && !is_an_alpha2(rd
->alpha2
) &&
1483 !is_unknown_alpha2(rd
->alpha2
))
1489 /* Lets only bother proceeding on the same alpha2 if the current
1490 * rd is non static (it means CRDA was present and was used last)
1491 * and the pending request came in from a country IE */
1492 if (last_request
->initiator
!= REGDOM_SET_BY_COUNTRY_IE
) {
1493 /* If someone else asked us to change the rd lets only bother
1494 * checking if the alpha2 changes if CRDA was already called */
1495 if (!is_old_static_regdom(cfg80211_regdomain
) &&
1496 !regdom_changed(rd
->alpha2
))
1500 /* Now lets set the regulatory domain, update all driver channels
1501 * and finally inform them of what we have done, in case they want
1502 * to review or adjust their own settings based on their own
1503 * internal EEPROM data */
1505 if (WARN_ON(!reg_is_valid_request(rd
->alpha2
)))
1508 if (!is_valid_rd(rd
)) {
1509 printk(KERN_ERR
"cfg80211: Invalid "
1510 "regulatory domain detected:\n");
1511 print_regdomain_info(rd
);
1515 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
1517 if (!last_request
->intersect
) {
1520 if (last_request
->initiator
!= REGDOM_SET_BY_DRIVER
) {
1522 cfg80211_regdomain
= rd
;
1526 /* For a driver hint, lets copy the regulatory domain the
1527 * driver wanted to the wiphy to deal with conflicts */
1529 BUG_ON(request_wiphy
->regd
);
1531 r
= reg_copy_regd(&request_wiphy
->regd
, rd
);
1536 cfg80211_regdomain
= rd
;
1540 /* Intersection requires a bit more work */
1542 if (last_request
->initiator
!= REGDOM_SET_BY_COUNTRY_IE
) {
1544 intersected_rd
= regdom_intersect(rd
, cfg80211_regdomain
);
1545 if (!intersected_rd
)
1548 /* We can trash what CRDA provided now.
1549 * However if a driver requested this specific regulatory
1550 * domain we keep it for its private use */
1551 if (last_request
->initiator
== REGDOM_SET_BY_DRIVER
)
1552 request_wiphy
->regd
= rd
;
1559 cfg80211_regdomain
= intersected_rd
;
1565 * Country IE requests are handled a bit differently, we intersect
1566 * the country IE rd with what CRDA believes that country should have
1569 BUG_ON(!country_ie_regdomain
);
1571 if (rd
!= country_ie_regdomain
) {
1572 /* Intersect what CRDA returned and our what we
1573 * had built from the Country IE received */
1575 intersected_rd
= regdom_intersect(rd
, country_ie_regdomain
);
1577 reg_country_ie_process_debug(rd
, country_ie_regdomain
,
1580 kfree(country_ie_regdomain
);
1581 country_ie_regdomain
= NULL
;
1583 /* This would happen when CRDA was not present and
1584 * OLD_REGULATORY was enabled. We intersect our Country
1585 * IE rd and what was set on cfg80211 originally */
1586 intersected_rd
= regdom_intersect(rd
, cfg80211_regdomain
);
1589 if (!intersected_rd
)
1592 drv
= wiphy_to_dev(request_wiphy
);
1594 drv
->country_ie_alpha2
[0] = rd
->alpha2
[0];
1595 drv
->country_ie_alpha2
[1] = rd
->alpha2
[1];
1596 drv
->env
= last_request
->country_ie_env
;
1598 BUG_ON(intersected_rd
== rd
);
1604 cfg80211_regdomain
= intersected_rd
;
1610 /* Use this call to set the current regulatory domain. Conflicts with
1611 * multiple drivers can be ironed out later. Caller must've already
1612 * kmalloc'd the rd structure. Caller must hold cfg80211_mutex */
1613 int set_regdom(const struct ieee80211_regdomain
*rd
)
1617 assert_cfg80211_lock();
1619 /* Note that this doesn't update the wiphys, this is done below */
1620 r
= __set_regdom(rd
);
1626 /* This would make this whole thing pointless */
1627 if (!last_request
->intersect
)
1628 BUG_ON(rd
!= cfg80211_regdomain
);
1630 /* update all wiphys now with the new established regulatory domain */
1631 update_all_wiphy_regulatory(last_request
->initiator
);
1633 print_regdomain(cfg80211_regdomain
);
1638 /* Caller must hold cfg80211_mutex */
1639 void reg_device_remove(struct wiphy
*wiphy
)
1641 struct wiphy
*request_wiphy
;
1643 assert_cfg80211_lock();
1645 request_wiphy
= wiphy_idx_to_wiphy(last_request
->wiphy_idx
);
1648 if (!last_request
|| !request_wiphy
)
1650 if (request_wiphy
!= wiphy
)
1652 last_request
->wiphy_idx
= WIPHY_IDX_STALE
;
1653 last_request
->country_ie_env
= ENVIRON_ANY
;
1656 int regulatory_init(void)
1660 reg_pdev
= platform_device_register_simple("regulatory", 0, NULL
, 0);
1661 if (IS_ERR(reg_pdev
))
1662 return PTR_ERR(reg_pdev
);
1664 #ifdef CONFIG_WIRELESS_OLD_REGULATORY
1665 cfg80211_regdomain
= static_regdom(ieee80211_regdom
);
1667 printk(KERN_INFO
"cfg80211: Using static regulatory domain info\n");
1668 print_regdomain_info(cfg80211_regdomain
);
1669 /* The old code still requests for a new regdomain and if
1670 * you have CRDA you get it updated, otherwise you get
1671 * stuck with the static values. We ignore "EU" code as
1672 * that is not a valid ISO / IEC 3166 alpha2 */
1673 if (ieee80211_regdom
[0] != 'E' || ieee80211_regdom
[1] != 'U')
1674 err
= regulatory_hint_core(ieee80211_regdom
);
1676 cfg80211_regdomain
= cfg80211_world_regdom
;
1678 err
= regulatory_hint_core("00");
1684 * N.B. kobject_uevent_env() can fail mainly for when we're out
1685 * memory which is handled and propagated appropriately above
1686 * but it can also fail during a netlink_broadcast() or during
1687 * early boot for call_usermodehelper(). For now treat these
1688 * errors as non-fatal.
1690 printk(KERN_ERR
"cfg80211: kobject_uevent_env() was unable "
1691 "to call CRDA during init");
1692 #ifdef CONFIG_CFG80211_REG_DEBUG
1693 /* We want to find out exactly why when debugging */
1701 void regulatory_exit(void)
1703 mutex_lock(&cfg80211_mutex
);
1707 kfree(country_ie_regdomain
);
1708 country_ie_regdomain
= NULL
;
1710 kfree(last_request
);
1712 platform_device_unregister(reg_pdev
);
1714 mutex_unlock(&cfg80211_mutex
);