2 * cfg80211 scan result handling
4 * Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
6 #include <linux/kernel.h>
7 #include <linux/slab.h>
8 #include <linux/module.h>
9 #include <linux/netdevice.h>
10 #include <linux/wireless.h>
11 #include <linux/nl80211.h>
12 #include <linux/etherdevice.h>
14 #include <net/cfg80211.h>
15 #include <net/cfg80211-wext.h>
16 #include <net/iw_handler.h>
19 #include "wext-compat.h"
23 * DOC: BSS tree/list structure
25 * At the top level, the BSS list is kept in both a list in each
26 * registered device (@bss_list) as well as an RB-tree for faster
27 * lookup. In the RB-tree, entries can be looked up using their
28 * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID
31 * Due to the possibility of hidden SSIDs, there's a second level
32 * structure, the "hidden_list" and "hidden_beacon_bss" pointer.
33 * The hidden_list connects all BSSes belonging to a single AP
34 * that has a hidden SSID, and connects beacon and probe response
35 * entries. For a probe response entry for a hidden SSID, the
36 * hidden_beacon_bss pointer points to the BSS struct holding the
37 * beacon's information.
39 * Reference counting is done for all these references except for
40 * the hidden_list, so that a beacon BSS struct that is otherwise
41 * not referenced has one reference for being on the bss_list and
42 * one for each probe response entry that points to it using the
43 * hidden_beacon_bss pointer. When a BSS struct that has such a
44 * pointer is get/put, the refcount update is also propagated to
45 * the referenced struct, this ensure that it cannot get removed
46 * while somebody is using the probe response version.
48 * Note that the hidden_beacon_bss pointer never changes, due to
49 * the reference counting. Therefore, no locking is needed for
52 * Also note that the hidden_beacon_bss pointer is only relevant
53 * if the driver uses something other than the IEs, e.g. private
54 * data stored stored in the BSS struct, since the beacon IEs are
55 * also linked into the probe response struct.
58 #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ)
60 static void bss_free(struct cfg80211_internal_bss
*bss
)
62 struct cfg80211_bss_ies
*ies
;
64 if (WARN_ON(atomic_read(&bss
->hold
)))
67 ies
= (void *)rcu_access_pointer(bss
->pub
.beacon_ies
);
68 if (ies
&& !bss
->pub
.hidden_beacon_bss
)
69 kfree_rcu(ies
, rcu_head
);
70 ies
= (void *)rcu_access_pointer(bss
->pub
.proberesp_ies
);
72 kfree_rcu(ies
, rcu_head
);
75 * This happens when the module is removed, it doesn't
76 * really matter any more save for completeness
78 if (!list_empty(&bss
->hidden_list
))
79 list_del(&bss
->hidden_list
);
84 static inline void bss_ref_get(struct cfg80211_registered_device
*rdev
,
85 struct cfg80211_internal_bss
*bss
)
87 lockdep_assert_held(&rdev
->bss_lock
);
90 if (bss
->pub
.hidden_beacon_bss
) {
91 bss
= container_of(bss
->pub
.hidden_beacon_bss
,
92 struct cfg80211_internal_bss
,
98 static inline void bss_ref_put(struct cfg80211_registered_device
*rdev
,
99 struct cfg80211_internal_bss
*bss
)
101 lockdep_assert_held(&rdev
->bss_lock
);
103 if (bss
->pub
.hidden_beacon_bss
) {
104 struct cfg80211_internal_bss
*hbss
;
105 hbss
= container_of(bss
->pub
.hidden_beacon_bss
,
106 struct cfg80211_internal_bss
,
109 if (hbss
->refcount
== 0)
113 if (bss
->refcount
== 0)
117 static bool __cfg80211_unlink_bss(struct cfg80211_registered_device
*rdev
,
118 struct cfg80211_internal_bss
*bss
)
120 lockdep_assert_held(&rdev
->bss_lock
);
122 if (!list_empty(&bss
->hidden_list
)) {
124 * don't remove the beacon entry if it has
125 * probe responses associated with it
127 if (!bss
->pub
.hidden_beacon_bss
)
130 * if it's a probe response entry break its
131 * link to the other entries in the group
133 list_del_init(&bss
->hidden_list
);
136 list_del_init(&bss
->list
);
137 rb_erase(&bss
->rbn
, &rdev
->bss_tree
);
138 bss_ref_put(rdev
, bss
);
142 static void __cfg80211_bss_expire(struct cfg80211_registered_device
*rdev
,
143 unsigned long expire_time
)
145 struct cfg80211_internal_bss
*bss
, *tmp
;
146 bool expired
= false;
148 lockdep_assert_held(&rdev
->bss_lock
);
150 list_for_each_entry_safe(bss
, tmp
, &rdev
->bss_list
, list
) {
151 if (atomic_read(&bss
->hold
))
153 if (!time_after(expire_time
, bss
->ts
))
156 if (__cfg80211_unlink_bss(rdev
, bss
))
161 rdev
->bss_generation
++;
164 void ___cfg80211_scan_done(struct cfg80211_registered_device
*rdev
,
167 struct cfg80211_scan_request
*request
;
168 struct wireless_dev
*wdev
;
170 #ifdef CONFIG_CFG80211_WEXT
171 union iwreq_data wrqu
;
176 if (rdev
->scan_msg
) {
177 nl80211_send_scan_result(rdev
, rdev
->scan_msg
);
178 rdev
->scan_msg
= NULL
;
182 request
= rdev
->scan_req
;
186 wdev
= request
->wdev
;
189 * This must be before sending the other events!
190 * Otherwise, wpa_supplicant gets completely confused with
194 cfg80211_sme_scan_done(wdev
->netdev
);
196 if (!request
->aborted
&&
197 request
->flags
& NL80211_SCAN_FLAG_FLUSH
) {
198 /* flush entries from previous scans */
199 spin_lock_bh(&rdev
->bss_lock
);
200 __cfg80211_bss_expire(rdev
, request
->scan_start
);
201 spin_unlock_bh(&rdev
->bss_lock
);
204 msg
= nl80211_build_scan_msg(rdev
, wdev
, request
->aborted
);
206 #ifdef CONFIG_CFG80211_WEXT
207 if (wdev
->netdev
&& !request
->aborted
) {
208 memset(&wrqu
, 0, sizeof(wrqu
));
210 wireless_send_event(wdev
->netdev
, SIOCGIWSCAN
, &wrqu
, NULL
);
215 dev_put(wdev
->netdev
);
217 rdev
->scan_req
= NULL
;
221 rdev
->scan_msg
= msg
;
223 nl80211_send_scan_result(rdev
, msg
);
226 void __cfg80211_scan_done(struct work_struct
*wk
)
228 struct cfg80211_registered_device
*rdev
;
230 rdev
= container_of(wk
, struct cfg80211_registered_device
,
234 ___cfg80211_scan_done(rdev
, true);
238 void cfg80211_scan_done(struct cfg80211_scan_request
*request
, bool aborted
)
240 trace_cfg80211_scan_done(request
, aborted
);
241 WARN_ON(request
!= wiphy_to_rdev(request
->wiphy
)->scan_req
);
243 request
->aborted
= aborted
;
244 request
->notified
= true;
245 queue_work(cfg80211_wq
, &wiphy_to_rdev(request
->wiphy
)->scan_done_wk
);
247 EXPORT_SYMBOL(cfg80211_scan_done
);
249 void __cfg80211_sched_scan_results(struct work_struct
*wk
)
251 struct cfg80211_registered_device
*rdev
;
252 struct cfg80211_sched_scan_request
*request
;
254 rdev
= container_of(wk
, struct cfg80211_registered_device
,
255 sched_scan_results_wk
);
259 request
= rdev
->sched_scan_req
;
261 /* we don't have sched_scan_req anymore if the scan is stopping */
263 if (request
->flags
& NL80211_SCAN_FLAG_FLUSH
) {
264 /* flush entries from previous scans */
265 spin_lock_bh(&rdev
->bss_lock
);
266 __cfg80211_bss_expire(rdev
, request
->scan_start
);
267 spin_unlock_bh(&rdev
->bss_lock
);
268 request
->scan_start
=
269 jiffies
+ msecs_to_jiffies(request
->interval
);
271 nl80211_send_sched_scan_results(rdev
, request
->dev
);
277 void cfg80211_sched_scan_results(struct wiphy
*wiphy
)
279 trace_cfg80211_sched_scan_results(wiphy
);
280 /* ignore if we're not scanning */
281 if (wiphy_to_rdev(wiphy
)->sched_scan_req
)
282 queue_work(cfg80211_wq
,
283 &wiphy_to_rdev(wiphy
)->sched_scan_results_wk
);
285 EXPORT_SYMBOL(cfg80211_sched_scan_results
);
287 void cfg80211_sched_scan_stopped_rtnl(struct wiphy
*wiphy
)
289 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wiphy
);
293 trace_cfg80211_sched_scan_stopped(wiphy
);
295 __cfg80211_stop_sched_scan(rdev
, true);
297 EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl
);
299 void cfg80211_sched_scan_stopped(struct wiphy
*wiphy
)
302 cfg80211_sched_scan_stopped_rtnl(wiphy
);
305 EXPORT_SYMBOL(cfg80211_sched_scan_stopped
);
307 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device
*rdev
,
308 bool driver_initiated
)
310 struct net_device
*dev
;
314 if (!rdev
->sched_scan_req
)
317 dev
= rdev
->sched_scan_req
->dev
;
319 if (!driver_initiated
) {
320 int err
= rdev_sched_scan_stop(rdev
, dev
);
325 nl80211_send_sched_scan(rdev
, dev
, NL80211_CMD_SCHED_SCAN_STOPPED
);
327 kfree(rdev
->sched_scan_req
);
328 rdev
->sched_scan_req
= NULL
;
333 void cfg80211_bss_age(struct cfg80211_registered_device
*rdev
,
334 unsigned long age_secs
)
336 struct cfg80211_internal_bss
*bss
;
337 unsigned long age_jiffies
= msecs_to_jiffies(age_secs
* MSEC_PER_SEC
);
339 spin_lock_bh(&rdev
->bss_lock
);
340 list_for_each_entry(bss
, &rdev
->bss_list
, list
)
341 bss
->ts
-= age_jiffies
;
342 spin_unlock_bh(&rdev
->bss_lock
);
345 void cfg80211_bss_expire(struct cfg80211_registered_device
*rdev
)
347 __cfg80211_bss_expire(rdev
, jiffies
- IEEE80211_SCAN_RESULT_EXPIRE
);
350 const u8
*cfg80211_find_ie(u8 eid
, const u8
*ies
, int len
)
352 while (len
> 2 && ies
[0] != eid
) {
358 if (len
< 2 + ies
[1])
362 EXPORT_SYMBOL(cfg80211_find_ie
);
364 const u8
*cfg80211_find_vendor_ie(unsigned int oui
, u8 oui_type
,
365 const u8
*ies
, int len
)
367 struct ieee80211_vendor_ie
*ie
;
368 const u8
*pos
= ies
, *end
= ies
+ len
;
372 pos
= cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC
, pos
,
377 ie
= (struct ieee80211_vendor_ie
*)pos
;
379 /* make sure we can access ie->len */
380 BUILD_BUG_ON(offsetof(struct ieee80211_vendor_ie
, len
) != 1);
382 if (ie
->len
< sizeof(*ie
))
385 ie_oui
= ie
->oui
[0] << 16 | ie
->oui
[1] << 8 | ie
->oui
[2];
386 if (ie_oui
== oui
&& ie
->oui_type
== oui_type
)
393 EXPORT_SYMBOL(cfg80211_find_vendor_ie
);
395 static bool is_bss(struct cfg80211_bss
*a
, const u8
*bssid
,
396 const u8
*ssid
, size_t ssid_len
)
398 const struct cfg80211_bss_ies
*ies
;
401 if (bssid
&& !ether_addr_equal(a
->bssid
, bssid
))
407 ies
= rcu_access_pointer(a
->ies
);
410 ssidie
= cfg80211_find_ie(WLAN_EID_SSID
, ies
->data
, ies
->len
);
413 if (ssidie
[1] != ssid_len
)
415 return memcmp(ssidie
+ 2, ssid
, ssid_len
) == 0;
419 * enum bss_compare_mode - BSS compare mode
420 * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
421 * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
422 * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
424 enum bss_compare_mode
{
430 static int cmp_bss(struct cfg80211_bss
*a
,
431 struct cfg80211_bss
*b
,
432 enum bss_compare_mode mode
)
434 const struct cfg80211_bss_ies
*a_ies
, *b_ies
;
435 const u8
*ie1
= NULL
;
436 const u8
*ie2
= NULL
;
439 if (a
->channel
!= b
->channel
)
440 return b
->channel
->center_freq
- a
->channel
->center_freq
;
442 a_ies
= rcu_access_pointer(a
->ies
);
445 b_ies
= rcu_access_pointer(b
->ies
);
449 if (WLAN_CAPABILITY_IS_STA_BSS(a
->capability
))
450 ie1
= cfg80211_find_ie(WLAN_EID_MESH_ID
,
451 a_ies
->data
, a_ies
->len
);
452 if (WLAN_CAPABILITY_IS_STA_BSS(b
->capability
))
453 ie2
= cfg80211_find_ie(WLAN_EID_MESH_ID
,
454 b_ies
->data
, b_ies
->len
);
458 if (ie1
[1] == ie2
[1])
459 mesh_id_cmp
= memcmp(ie1
+ 2, ie2
+ 2, ie1
[1]);
461 mesh_id_cmp
= ie2
[1] - ie1
[1];
463 ie1
= cfg80211_find_ie(WLAN_EID_MESH_CONFIG
,
464 a_ies
->data
, a_ies
->len
);
465 ie2
= cfg80211_find_ie(WLAN_EID_MESH_CONFIG
,
466 b_ies
->data
, b_ies
->len
);
470 if (ie1
[1] != ie2
[1])
471 return ie2
[1] - ie1
[1];
472 return memcmp(ie1
+ 2, ie2
+ 2, ie1
[1]);
476 r
= memcmp(a
->bssid
, b
->bssid
, sizeof(a
->bssid
));
480 ie1
= cfg80211_find_ie(WLAN_EID_SSID
, a_ies
->data
, a_ies
->len
);
481 ie2
= cfg80211_find_ie(WLAN_EID_SSID
, b_ies
->data
, b_ies
->len
);
487 * Note that with "hide_ssid", the function returns a match if
488 * the already-present BSS ("b") is a hidden SSID beacon for
492 /* sort missing IE before (left of) present IE */
499 case BSS_CMP_HIDE_ZLEN
:
501 * In ZLEN mode we assume the BSS entry we're
502 * looking for has a zero-length SSID. So if
503 * the one we're looking at right now has that,
504 * return 0. Otherwise, return the difference
505 * in length, but since we're looking for the
506 * 0-length it's really equivalent to returning
507 * the length of the one we're looking at.
509 * No content comparison is needed as we assume
510 * the content length is zero.
513 case BSS_CMP_REGULAR
:
515 /* sort by length first, then by contents */
516 if (ie1
[1] != ie2
[1])
517 return ie2
[1] - ie1
[1];
518 return memcmp(ie1
+ 2, ie2
+ 2, ie1
[1]);
519 case BSS_CMP_HIDE_NUL
:
520 if (ie1
[1] != ie2
[1])
521 return ie2
[1] - ie1
[1];
522 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */
523 for (i
= 0; i
< ie2
[1]; i
++)
530 /* Returned bss is reference counted and must be cleaned up appropriately. */
531 struct cfg80211_bss
*cfg80211_get_bss(struct wiphy
*wiphy
,
532 struct ieee80211_channel
*channel
,
534 const u8
*ssid
, size_t ssid_len
,
535 u16 capa_mask
, u16 capa_val
)
537 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wiphy
);
538 struct cfg80211_internal_bss
*bss
, *res
= NULL
;
539 unsigned long now
= jiffies
;
541 trace_cfg80211_get_bss(wiphy
, channel
, bssid
, ssid
, ssid_len
, capa_mask
,
544 spin_lock_bh(&rdev
->bss_lock
);
546 list_for_each_entry(bss
, &rdev
->bss_list
, list
) {
547 if ((bss
->pub
.capability
& capa_mask
) != capa_val
)
549 if (channel
&& bss
->pub
.channel
!= channel
)
551 if (!is_valid_ether_addr(bss
->pub
.bssid
))
553 /* Don't get expired BSS structs */
554 if (time_after(now
, bss
->ts
+ IEEE80211_SCAN_RESULT_EXPIRE
) &&
555 !atomic_read(&bss
->hold
))
557 if (is_bss(&bss
->pub
, bssid
, ssid
, ssid_len
)) {
559 bss_ref_get(rdev
, res
);
564 spin_unlock_bh(&rdev
->bss_lock
);
567 trace_cfg80211_return_bss(&res
->pub
);
570 EXPORT_SYMBOL(cfg80211_get_bss
);
572 static void rb_insert_bss(struct cfg80211_registered_device
*rdev
,
573 struct cfg80211_internal_bss
*bss
)
575 struct rb_node
**p
= &rdev
->bss_tree
.rb_node
;
576 struct rb_node
*parent
= NULL
;
577 struct cfg80211_internal_bss
*tbss
;
582 tbss
= rb_entry(parent
, struct cfg80211_internal_bss
, rbn
);
584 cmp
= cmp_bss(&bss
->pub
, &tbss
->pub
, BSS_CMP_REGULAR
);
587 /* will sort of leak this BSS */
597 rb_link_node(&bss
->rbn
, parent
, p
);
598 rb_insert_color(&bss
->rbn
, &rdev
->bss_tree
);
601 static struct cfg80211_internal_bss
*
602 rb_find_bss(struct cfg80211_registered_device
*rdev
,
603 struct cfg80211_internal_bss
*res
,
604 enum bss_compare_mode mode
)
606 struct rb_node
*n
= rdev
->bss_tree
.rb_node
;
607 struct cfg80211_internal_bss
*bss
;
611 bss
= rb_entry(n
, struct cfg80211_internal_bss
, rbn
);
612 r
= cmp_bss(&res
->pub
, &bss
->pub
, mode
);
625 static bool cfg80211_combine_bsses(struct cfg80211_registered_device
*rdev
,
626 struct cfg80211_internal_bss
*new)
628 const struct cfg80211_bss_ies
*ies
;
629 struct cfg80211_internal_bss
*bss
;
634 ies
= rcu_access_pointer(new->pub
.beacon_ies
);
638 ie
= cfg80211_find_ie(WLAN_EID_SSID
, ies
->data
, ies
->len
);
645 for (i
= 0; i
< ssidlen
; i
++)
649 /* not a hidden SSID */
653 /* This is the bad part ... */
655 list_for_each_entry(bss
, &rdev
->bss_list
, list
) {
656 if (!ether_addr_equal(bss
->pub
.bssid
, new->pub
.bssid
))
658 if (bss
->pub
.channel
!= new->pub
.channel
)
660 if (bss
->pub
.scan_width
!= new->pub
.scan_width
)
662 if (rcu_access_pointer(bss
->pub
.beacon_ies
))
664 ies
= rcu_access_pointer(bss
->pub
.ies
);
667 ie
= cfg80211_find_ie(WLAN_EID_SSID
, ies
->data
, ies
->len
);
670 if (ssidlen
&& ie
[1] != ssidlen
)
672 if (WARN_ON_ONCE(bss
->pub
.hidden_beacon_bss
))
674 if (WARN_ON_ONCE(!list_empty(&bss
->hidden_list
)))
675 list_del(&bss
->hidden_list
);
677 list_add(&bss
->hidden_list
, &new->hidden_list
);
678 bss
->pub
.hidden_beacon_bss
= &new->pub
;
679 new->refcount
+= bss
->refcount
;
680 rcu_assign_pointer(bss
->pub
.beacon_ies
,
681 new->pub
.beacon_ies
);
687 /* Returned bss is reference counted and must be cleaned up appropriately. */
688 static struct cfg80211_internal_bss
*
689 cfg80211_bss_update(struct cfg80211_registered_device
*rdev
,
690 struct cfg80211_internal_bss
*tmp
,
693 struct cfg80211_internal_bss
*found
= NULL
;
695 if (WARN_ON(!tmp
->pub
.channel
))
700 spin_lock_bh(&rdev
->bss_lock
);
702 if (WARN_ON(!rcu_access_pointer(tmp
->pub
.ies
))) {
703 spin_unlock_bh(&rdev
->bss_lock
);
707 found
= rb_find_bss(rdev
, tmp
, BSS_CMP_REGULAR
);
711 if (rcu_access_pointer(tmp
->pub
.proberesp_ies
)) {
712 const struct cfg80211_bss_ies
*old
;
714 old
= rcu_access_pointer(found
->pub
.proberesp_ies
);
716 rcu_assign_pointer(found
->pub
.proberesp_ies
,
717 tmp
->pub
.proberesp_ies
);
718 /* Override possible earlier Beacon frame IEs */
719 rcu_assign_pointer(found
->pub
.ies
,
720 tmp
->pub
.proberesp_ies
);
722 kfree_rcu((struct cfg80211_bss_ies
*)old
,
724 } else if (rcu_access_pointer(tmp
->pub
.beacon_ies
)) {
725 const struct cfg80211_bss_ies
*old
;
726 struct cfg80211_internal_bss
*bss
;
728 if (found
->pub
.hidden_beacon_bss
&&
729 !list_empty(&found
->hidden_list
)) {
730 const struct cfg80211_bss_ies
*f
;
733 * The found BSS struct is one of the probe
734 * response members of a group, but we're
735 * receiving a beacon (beacon_ies in the tmp
736 * bss is used). This can only mean that the
737 * AP changed its beacon from not having an
738 * SSID to showing it, which is confusing so
739 * drop this information.
742 f
= rcu_access_pointer(tmp
->pub
.beacon_ies
);
743 kfree_rcu((struct cfg80211_bss_ies
*)f
,
748 old
= rcu_access_pointer(found
->pub
.beacon_ies
);
750 rcu_assign_pointer(found
->pub
.beacon_ies
,
751 tmp
->pub
.beacon_ies
);
753 /* Override IEs if they were from a beacon before */
754 if (old
== rcu_access_pointer(found
->pub
.ies
))
755 rcu_assign_pointer(found
->pub
.ies
,
756 tmp
->pub
.beacon_ies
);
758 /* Assign beacon IEs to all sub entries */
759 list_for_each_entry(bss
, &found
->hidden_list
,
761 const struct cfg80211_bss_ies
*ies
;
763 ies
= rcu_access_pointer(bss
->pub
.beacon_ies
);
766 rcu_assign_pointer(bss
->pub
.beacon_ies
,
767 tmp
->pub
.beacon_ies
);
771 kfree_rcu((struct cfg80211_bss_ies
*)old
,
775 found
->pub
.beacon_interval
= tmp
->pub
.beacon_interval
;
777 * don't update the signal if beacon was heard on
781 found
->pub
.signal
= tmp
->pub
.signal
;
782 found
->pub
.capability
= tmp
->pub
.capability
;
785 struct cfg80211_internal_bss
*new;
786 struct cfg80211_internal_bss
*hidden
;
787 struct cfg80211_bss_ies
*ies
;
790 * create a copy -- the "res" variable that is passed in
791 * is allocated on the stack since it's not needed in the
792 * more common case of an update
794 new = kzalloc(sizeof(*new) + rdev
->wiphy
.bss_priv_size
,
797 ies
= (void *)rcu_dereference(tmp
->pub
.beacon_ies
);
799 kfree_rcu(ies
, rcu_head
);
800 ies
= (void *)rcu_dereference(tmp
->pub
.proberesp_ies
);
802 kfree_rcu(ies
, rcu_head
);
805 memcpy(new, tmp
, sizeof(*new));
807 INIT_LIST_HEAD(&new->hidden_list
);
809 if (rcu_access_pointer(tmp
->pub
.proberesp_ies
)) {
810 hidden
= rb_find_bss(rdev
, tmp
, BSS_CMP_HIDE_ZLEN
);
812 hidden
= rb_find_bss(rdev
, tmp
,
815 new->pub
.hidden_beacon_bss
= &hidden
->pub
;
816 list_add(&new->hidden_list
,
817 &hidden
->hidden_list
);
819 rcu_assign_pointer(new->pub
.beacon_ies
,
820 hidden
->pub
.beacon_ies
);
824 * Ok so we found a beacon, and don't have an entry. If
825 * it's a beacon with hidden SSID, we might be in for an
826 * expensive search for any probe responses that should
827 * be grouped with this beacon for updates ...
829 if (!cfg80211_combine_bsses(rdev
, new)) {
835 list_add_tail(&new->list
, &rdev
->bss_list
);
836 rb_insert_bss(rdev
, new);
840 rdev
->bss_generation
++;
841 bss_ref_get(rdev
, found
);
842 spin_unlock_bh(&rdev
->bss_lock
);
846 spin_unlock_bh(&rdev
->bss_lock
);
850 static struct ieee80211_channel
*
851 cfg80211_get_bss_channel(struct wiphy
*wiphy
, const u8
*ie
, size_t ielen
,
852 struct ieee80211_channel
*channel
)
856 int channel_number
= -1;
858 tmp
= cfg80211_find_ie(WLAN_EID_DS_PARAMS
, ie
, ielen
);
859 if (tmp
&& tmp
[1] == 1) {
860 channel_number
= tmp
[2];
862 tmp
= cfg80211_find_ie(WLAN_EID_HT_OPERATION
, ie
, ielen
);
863 if (tmp
&& tmp
[1] >= sizeof(struct ieee80211_ht_operation
)) {
864 struct ieee80211_ht_operation
*htop
= (void *)(tmp
+ 2);
866 channel_number
= htop
->primary_chan
;
870 if (channel_number
< 0)
873 freq
= ieee80211_channel_to_frequency(channel_number
, channel
->band
);
874 channel
= ieee80211_get_channel(wiphy
, freq
);
877 if (channel
->flags
& IEEE80211_CHAN_DISABLED
)
882 /* Returned bss is reference counted and must be cleaned up appropriately. */
884 cfg80211_inform_bss_width(struct wiphy
*wiphy
,
885 struct ieee80211_channel
*rx_channel
,
886 enum nl80211_bss_scan_width scan_width
,
887 enum cfg80211_bss_frame_type ftype
,
888 const u8
*bssid
, u64 tsf
, u16 capability
,
889 u16 beacon_interval
, const u8
*ie
, size_t ielen
,
890 s32 signal
, gfp_t gfp
)
892 struct cfg80211_bss_ies
*ies
;
893 struct ieee80211_channel
*channel
;
894 struct cfg80211_internal_bss tmp
= {}, *res
;
900 if (WARN_ON(wiphy
->signal_type
== CFG80211_SIGNAL_TYPE_UNSPEC
&&
901 (signal
< 0 || signal
> 100)))
904 channel
= cfg80211_get_bss_channel(wiphy
, ie
, ielen
, rx_channel
);
908 memcpy(tmp
.pub
.bssid
, bssid
, ETH_ALEN
);
909 tmp
.pub
.channel
= channel
;
910 tmp
.pub
.scan_width
= scan_width
;
911 tmp
.pub
.signal
= signal
;
912 tmp
.pub
.beacon_interval
= beacon_interval
;
913 tmp
.pub
.capability
= capability
;
915 * If we do not know here whether the IEs are from a Beacon or Probe
916 * Response frame, we need to pick one of the options and only use it
917 * with the driver that does not provide the full Beacon/Probe Response
918 * frame. Use Beacon frame pointer to avoid indicating that this should
919 * override the IEs pointer should we have received an earlier
920 * indication of Probe Response data.
922 ies
= kzalloc(sizeof(*ies
) + ielen
, gfp
);
927 ies
->from_beacon
= false;
928 memcpy(ies
->data
, ie
, ielen
);
931 case CFG80211_BSS_FTYPE_BEACON
:
932 ies
->from_beacon
= true;
933 /* fall through to assign */
934 case CFG80211_BSS_FTYPE_UNKNOWN
:
935 rcu_assign_pointer(tmp
.pub
.beacon_ies
, ies
);
937 case CFG80211_BSS_FTYPE_PRESP
:
938 rcu_assign_pointer(tmp
.pub
.proberesp_ies
, ies
);
941 rcu_assign_pointer(tmp
.pub
.ies
, ies
);
943 signal_valid
= abs(rx_channel
->center_freq
- channel
->center_freq
) <=
944 wiphy
->max_adj_channel_rssi_comp
;
945 res
= cfg80211_bss_update(wiphy_to_rdev(wiphy
), &tmp
, signal_valid
);
949 if (res
->pub
.capability
& WLAN_CAPABILITY_ESS
)
950 regulatory_hint_found_beacon(wiphy
, channel
, gfp
);
952 trace_cfg80211_return_bss(&res
->pub
);
953 /* cfg80211_bss_update gives us a referenced result */
956 EXPORT_SYMBOL(cfg80211_inform_bss_width
);
958 /* Returned bss is reference counted and must be cleaned up appropriately. */
959 struct cfg80211_bss
*
960 cfg80211_inform_bss_width_frame(struct wiphy
*wiphy
,
961 struct ieee80211_channel
*rx_channel
,
962 enum nl80211_bss_scan_width scan_width
,
963 struct ieee80211_mgmt
*mgmt
, size_t len
,
964 s32 signal
, gfp_t gfp
)
966 struct cfg80211_internal_bss tmp
= {}, *res
;
967 struct cfg80211_bss_ies
*ies
;
968 struct ieee80211_channel
*channel
;
970 size_t ielen
= len
- offsetof(struct ieee80211_mgmt
,
971 u
.probe_resp
.variable
);
973 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt
, u
.probe_resp
.variable
) !=
974 offsetof(struct ieee80211_mgmt
, u
.beacon
.variable
));
976 trace_cfg80211_inform_bss_width_frame(wiphy
, rx_channel
, scan_width
, mgmt
,
985 if (WARN_ON(wiphy
->signal_type
== CFG80211_SIGNAL_TYPE_UNSPEC
&&
986 (signal
< 0 || signal
> 100)))
989 if (WARN_ON(len
< offsetof(struct ieee80211_mgmt
, u
.probe_resp
.variable
)))
992 channel
= cfg80211_get_bss_channel(wiphy
, mgmt
->u
.beacon
.variable
,
997 ies
= kzalloc(sizeof(*ies
) + ielen
, gfp
);
1001 ies
->tsf
= le64_to_cpu(mgmt
->u
.probe_resp
.timestamp
);
1002 ies
->from_beacon
= ieee80211_is_beacon(mgmt
->frame_control
);
1003 memcpy(ies
->data
, mgmt
->u
.probe_resp
.variable
, ielen
);
1005 if (ieee80211_is_probe_resp(mgmt
->frame_control
))
1006 rcu_assign_pointer(tmp
.pub
.proberesp_ies
, ies
);
1008 rcu_assign_pointer(tmp
.pub
.beacon_ies
, ies
);
1009 rcu_assign_pointer(tmp
.pub
.ies
, ies
);
1011 memcpy(tmp
.pub
.bssid
, mgmt
->bssid
, ETH_ALEN
);
1012 tmp
.pub
.channel
= channel
;
1013 tmp
.pub
.scan_width
= scan_width
;
1014 tmp
.pub
.signal
= signal
;
1015 tmp
.pub
.beacon_interval
= le16_to_cpu(mgmt
->u
.probe_resp
.beacon_int
);
1016 tmp
.pub
.capability
= le16_to_cpu(mgmt
->u
.probe_resp
.capab_info
);
1018 signal_valid
= abs(rx_channel
->center_freq
- channel
->center_freq
) <=
1019 wiphy
->max_adj_channel_rssi_comp
;
1020 res
= cfg80211_bss_update(wiphy_to_rdev(wiphy
), &tmp
, signal_valid
);
1024 if (res
->pub
.capability
& WLAN_CAPABILITY_ESS
)
1025 regulatory_hint_found_beacon(wiphy
, channel
, gfp
);
1027 trace_cfg80211_return_bss(&res
->pub
);
1028 /* cfg80211_bss_update gives us a referenced result */
1031 EXPORT_SYMBOL(cfg80211_inform_bss_width_frame
);
1033 void cfg80211_ref_bss(struct wiphy
*wiphy
, struct cfg80211_bss
*pub
)
1035 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wiphy
);
1036 struct cfg80211_internal_bss
*bss
;
1041 bss
= container_of(pub
, struct cfg80211_internal_bss
, pub
);
1043 spin_lock_bh(&rdev
->bss_lock
);
1044 bss_ref_get(rdev
, bss
);
1045 spin_unlock_bh(&rdev
->bss_lock
);
1047 EXPORT_SYMBOL(cfg80211_ref_bss
);
1049 void cfg80211_put_bss(struct wiphy
*wiphy
, struct cfg80211_bss
*pub
)
1051 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wiphy
);
1052 struct cfg80211_internal_bss
*bss
;
1057 bss
= container_of(pub
, struct cfg80211_internal_bss
, pub
);
1059 spin_lock_bh(&rdev
->bss_lock
);
1060 bss_ref_put(rdev
, bss
);
1061 spin_unlock_bh(&rdev
->bss_lock
);
1063 EXPORT_SYMBOL(cfg80211_put_bss
);
1065 void cfg80211_unlink_bss(struct wiphy
*wiphy
, struct cfg80211_bss
*pub
)
1067 struct cfg80211_registered_device
*rdev
= wiphy_to_rdev(wiphy
);
1068 struct cfg80211_internal_bss
*bss
;
1073 bss
= container_of(pub
, struct cfg80211_internal_bss
, pub
);
1075 spin_lock_bh(&rdev
->bss_lock
);
1076 if (!list_empty(&bss
->list
)) {
1077 if (__cfg80211_unlink_bss(rdev
, bss
))
1078 rdev
->bss_generation
++;
1080 spin_unlock_bh(&rdev
->bss_lock
);
1082 EXPORT_SYMBOL(cfg80211_unlink_bss
);
1084 #ifdef CONFIG_CFG80211_WEXT
1085 static struct cfg80211_registered_device
*
1086 cfg80211_get_dev_from_ifindex(struct net
*net
, int ifindex
)
1088 struct cfg80211_registered_device
*rdev
;
1089 struct net_device
*dev
;
1093 dev
= dev_get_by_index(net
, ifindex
);
1095 return ERR_PTR(-ENODEV
);
1096 if (dev
->ieee80211_ptr
)
1097 rdev
= wiphy_to_rdev(dev
->ieee80211_ptr
->wiphy
);
1099 rdev
= ERR_PTR(-ENODEV
);
1104 int cfg80211_wext_siwscan(struct net_device
*dev
,
1105 struct iw_request_info
*info
,
1106 union iwreq_data
*wrqu
, char *extra
)
1108 struct cfg80211_registered_device
*rdev
;
1109 struct wiphy
*wiphy
;
1110 struct iw_scan_req
*wreq
= NULL
;
1111 struct cfg80211_scan_request
*creq
= NULL
;
1112 int i
, err
, n_channels
= 0;
1113 enum ieee80211_band band
;
1115 if (!netif_running(dev
))
1118 if (wrqu
->data
.length
== sizeof(struct iw_scan_req
))
1119 wreq
= (struct iw_scan_req
*)extra
;
1121 rdev
= cfg80211_get_dev_from_ifindex(dev_net(dev
), dev
->ifindex
);
1124 return PTR_ERR(rdev
);
1126 if (rdev
->scan_req
|| rdev
->scan_msg
) {
1131 wiphy
= &rdev
->wiphy
;
1133 /* Determine number of channels, needed to allocate creq */
1134 if (wreq
&& wreq
->num_channels
)
1135 n_channels
= wreq
->num_channels
;
1137 n_channels
= ieee80211_get_num_supported_channels(wiphy
);
1139 creq
= kzalloc(sizeof(*creq
) + sizeof(struct cfg80211_ssid
) +
1140 n_channels
* sizeof(void *),
1147 creq
->wiphy
= wiphy
;
1148 creq
->wdev
= dev
->ieee80211_ptr
;
1149 /* SSIDs come after channels */
1150 creq
->ssids
= (void *)&creq
->channels
[n_channels
];
1151 creq
->n_channels
= n_channels
;
1153 creq
->scan_start
= jiffies
;
1155 /* translate "Scan on frequencies" request */
1157 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
1160 if (!wiphy
->bands
[band
])
1163 for (j
= 0; j
< wiphy
->bands
[band
]->n_channels
; j
++) {
1164 /* ignore disabled channels */
1165 if (wiphy
->bands
[band
]->channels
[j
].flags
&
1166 IEEE80211_CHAN_DISABLED
)
1169 /* If we have a wireless request structure and the
1170 * wireless request specifies frequencies, then search
1171 * for the matching hardware channel.
1173 if (wreq
&& wreq
->num_channels
) {
1175 int wiphy_freq
= wiphy
->bands
[band
]->channels
[j
].center_freq
;
1176 for (k
= 0; k
< wreq
->num_channels
; k
++) {
1177 struct iw_freq
*freq
=
1178 &wreq
->channel_list
[k
];
1180 cfg80211_wext_freq(freq
);
1182 if (wext_freq
== wiphy_freq
)
1183 goto wext_freq_found
;
1185 goto wext_freq_not_found
;
1189 creq
->channels
[i
] = &wiphy
->bands
[band
]->channels
[j
];
1191 wext_freq_not_found
: ;
1194 /* No channels found? */
1200 /* Set real number of channels specified in creq->channels[] */
1201 creq
->n_channels
= i
;
1203 /* translate "Scan for SSID" request */
1205 if (wrqu
->data
.flags
& IW_SCAN_THIS_ESSID
) {
1206 if (wreq
->essid_len
> IEEE80211_MAX_SSID_LEN
) {
1210 memcpy(creq
->ssids
[0].ssid
, wreq
->essid
, wreq
->essid_len
);
1211 creq
->ssids
[0].ssid_len
= wreq
->essid_len
;
1213 if (wreq
->scan_type
== IW_SCAN_TYPE_PASSIVE
)
1217 for (i
= 0; i
< IEEE80211_NUM_BANDS
; i
++)
1218 if (wiphy
->bands
[i
])
1219 creq
->rates
[i
] = (1 << wiphy
->bands
[i
]->n_bitrates
) - 1;
1221 rdev
->scan_req
= creq
;
1222 err
= rdev_scan(rdev
, creq
);
1224 rdev
->scan_req
= NULL
;
1225 /* creq will be freed below */
1227 nl80211_send_scan_start(rdev
, dev
->ieee80211_ptr
);
1228 /* creq now owned by driver */
1236 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan
);
1238 static void ieee80211_scan_add_ies(struct iw_request_info
*info
,
1239 const struct cfg80211_bss_ies
*ies
,
1240 char **current_ev
, char *end_buf
)
1242 const u8
*pos
, *end
, *next
;
1243 struct iw_event iwe
;
1249 * If needed, fragment the IEs buffer (at IE boundaries) into short
1250 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
1253 end
= pos
+ ies
->len
;
1255 while (end
- pos
> IW_GENERIC_IE_MAX
) {
1256 next
= pos
+ 2 + pos
[1];
1257 while (next
+ 2 + next
[1] - pos
< IW_GENERIC_IE_MAX
)
1258 next
= next
+ 2 + next
[1];
1260 memset(&iwe
, 0, sizeof(iwe
));
1261 iwe
.cmd
= IWEVGENIE
;
1262 iwe
.u
.data
.length
= next
- pos
;
1263 *current_ev
= iwe_stream_add_point(info
, *current_ev
,
1271 memset(&iwe
, 0, sizeof(iwe
));
1272 iwe
.cmd
= IWEVGENIE
;
1273 iwe
.u
.data
.length
= end
- pos
;
1274 *current_ev
= iwe_stream_add_point(info
, *current_ev
,
1281 ieee80211_bss(struct wiphy
*wiphy
, struct iw_request_info
*info
,
1282 struct cfg80211_internal_bss
*bss
, char *current_ev
,
1285 const struct cfg80211_bss_ies
*ies
;
1286 struct iw_event iwe
;
1290 bool ismesh
= false;
1292 memset(&iwe
, 0, sizeof(iwe
));
1293 iwe
.cmd
= SIOCGIWAP
;
1294 iwe
.u
.ap_addr
.sa_family
= ARPHRD_ETHER
;
1295 memcpy(iwe
.u
.ap_addr
.sa_data
, bss
->pub
.bssid
, ETH_ALEN
);
1296 current_ev
= iwe_stream_add_event(info
, current_ev
, end_buf
, &iwe
,
1299 memset(&iwe
, 0, sizeof(iwe
));
1300 iwe
.cmd
= SIOCGIWFREQ
;
1301 iwe
.u
.freq
.m
= ieee80211_frequency_to_channel(bss
->pub
.channel
->center_freq
);
1303 current_ev
= iwe_stream_add_event(info
, current_ev
, end_buf
, &iwe
,
1306 memset(&iwe
, 0, sizeof(iwe
));
1307 iwe
.cmd
= SIOCGIWFREQ
;
1308 iwe
.u
.freq
.m
= bss
->pub
.channel
->center_freq
;
1310 current_ev
= iwe_stream_add_event(info
, current_ev
, end_buf
, &iwe
,
1313 if (wiphy
->signal_type
!= CFG80211_SIGNAL_TYPE_NONE
) {
1314 memset(&iwe
, 0, sizeof(iwe
));
1316 iwe
.u
.qual
.updated
= IW_QUAL_LEVEL_UPDATED
|
1317 IW_QUAL_NOISE_INVALID
|
1318 IW_QUAL_QUAL_UPDATED
;
1319 switch (wiphy
->signal_type
) {
1320 case CFG80211_SIGNAL_TYPE_MBM
:
1321 sig
= bss
->pub
.signal
/ 100;
1322 iwe
.u
.qual
.level
= sig
;
1323 iwe
.u
.qual
.updated
|= IW_QUAL_DBM
;
1324 if (sig
< -110) /* rather bad */
1326 else if (sig
> -40) /* perfect */
1328 /* will give a range of 0 .. 70 */
1329 iwe
.u
.qual
.qual
= sig
+ 110;
1331 case CFG80211_SIGNAL_TYPE_UNSPEC
:
1332 iwe
.u
.qual
.level
= bss
->pub
.signal
;
1333 /* will give range 0 .. 100 */
1334 iwe
.u
.qual
.qual
= bss
->pub
.signal
;
1340 current_ev
= iwe_stream_add_event(info
, current_ev
, end_buf
,
1341 &iwe
, IW_EV_QUAL_LEN
);
1344 memset(&iwe
, 0, sizeof(iwe
));
1345 iwe
.cmd
= SIOCGIWENCODE
;
1346 if (bss
->pub
.capability
& WLAN_CAPABILITY_PRIVACY
)
1347 iwe
.u
.data
.flags
= IW_ENCODE_ENABLED
| IW_ENCODE_NOKEY
;
1349 iwe
.u
.data
.flags
= IW_ENCODE_DISABLED
;
1350 iwe
.u
.data
.length
= 0;
1351 current_ev
= iwe_stream_add_point(info
, current_ev
, end_buf
,
1355 ies
= rcu_dereference(bss
->pub
.ies
);
1361 if (ie
[1] > rem
- 2)
1366 memset(&iwe
, 0, sizeof(iwe
));
1367 iwe
.cmd
= SIOCGIWESSID
;
1368 iwe
.u
.data
.length
= ie
[1];
1369 iwe
.u
.data
.flags
= 1;
1370 current_ev
= iwe_stream_add_point(info
, current_ev
, end_buf
,
1371 &iwe
, (u8
*)ie
+ 2);
1373 case WLAN_EID_MESH_ID
:
1374 memset(&iwe
, 0, sizeof(iwe
));
1375 iwe
.cmd
= SIOCGIWESSID
;
1376 iwe
.u
.data
.length
= ie
[1];
1377 iwe
.u
.data
.flags
= 1;
1378 current_ev
= iwe_stream_add_point(info
, current_ev
, end_buf
,
1379 &iwe
, (u8
*)ie
+ 2);
1381 case WLAN_EID_MESH_CONFIG
:
1383 if (ie
[1] != sizeof(struct ieee80211_meshconf_ie
))
1385 buf
= kmalloc(50, GFP_ATOMIC
);
1389 memset(&iwe
, 0, sizeof(iwe
));
1390 iwe
.cmd
= IWEVCUSTOM
;
1391 sprintf(buf
, "Mesh Network Path Selection Protocol ID: "
1393 iwe
.u
.data
.length
= strlen(buf
);
1394 current_ev
= iwe_stream_add_point(info
, current_ev
,
1397 sprintf(buf
, "Path Selection Metric ID: 0x%02X",
1399 iwe
.u
.data
.length
= strlen(buf
);
1400 current_ev
= iwe_stream_add_point(info
, current_ev
,
1403 sprintf(buf
, "Congestion Control Mode ID: 0x%02X",
1405 iwe
.u
.data
.length
= strlen(buf
);
1406 current_ev
= iwe_stream_add_point(info
, current_ev
,
1409 sprintf(buf
, "Synchronization ID: 0x%02X", cfg
[3]);
1410 iwe
.u
.data
.length
= strlen(buf
);
1411 current_ev
= iwe_stream_add_point(info
, current_ev
,
1414 sprintf(buf
, "Authentication ID: 0x%02X", cfg
[4]);
1415 iwe
.u
.data
.length
= strlen(buf
);
1416 current_ev
= iwe_stream_add_point(info
, current_ev
,
1419 sprintf(buf
, "Formation Info: 0x%02X", cfg
[5]);
1420 iwe
.u
.data
.length
= strlen(buf
);
1421 current_ev
= iwe_stream_add_point(info
, current_ev
,
1424 sprintf(buf
, "Capabilities: 0x%02X", cfg
[6]);
1425 iwe
.u
.data
.length
= strlen(buf
);
1426 current_ev
= iwe_stream_add_point(info
, current_ev
,
1431 case WLAN_EID_SUPP_RATES
:
1432 case WLAN_EID_EXT_SUPP_RATES
:
1433 /* display all supported rates in readable format */
1434 p
= current_ev
+ iwe_stream_lcp_len(info
);
1436 memset(&iwe
, 0, sizeof(iwe
));
1437 iwe
.cmd
= SIOCGIWRATE
;
1438 /* Those two flags are ignored... */
1439 iwe
.u
.bitrate
.fixed
= iwe
.u
.bitrate
.disabled
= 0;
1441 for (i
= 0; i
< ie
[1]; i
++) {
1442 iwe
.u
.bitrate
.value
=
1443 ((ie
[i
+ 2] & 0x7f) * 500000);
1444 p
= iwe_stream_add_value(info
, current_ev
, p
,
1445 end_buf
, &iwe
, IW_EV_PARAM_LEN
);
1454 if (bss
->pub
.capability
& (WLAN_CAPABILITY_ESS
| WLAN_CAPABILITY_IBSS
) ||
1456 memset(&iwe
, 0, sizeof(iwe
));
1457 iwe
.cmd
= SIOCGIWMODE
;
1459 iwe
.u
.mode
= IW_MODE_MESH
;
1460 else if (bss
->pub
.capability
& WLAN_CAPABILITY_ESS
)
1461 iwe
.u
.mode
= IW_MODE_MASTER
;
1463 iwe
.u
.mode
= IW_MODE_ADHOC
;
1464 current_ev
= iwe_stream_add_event(info
, current_ev
, end_buf
,
1465 &iwe
, IW_EV_UINT_LEN
);
1468 buf
= kmalloc(31, GFP_ATOMIC
);
1470 memset(&iwe
, 0, sizeof(iwe
));
1471 iwe
.cmd
= IWEVCUSTOM
;
1472 sprintf(buf
, "tsf=%016llx", (unsigned long long)(ies
->tsf
));
1473 iwe
.u
.data
.length
= strlen(buf
);
1474 current_ev
= iwe_stream_add_point(info
, current_ev
, end_buf
,
1476 memset(&iwe
, 0, sizeof(iwe
));
1477 iwe
.cmd
= IWEVCUSTOM
;
1478 sprintf(buf
, " Last beacon: %ums ago",
1479 elapsed_jiffies_msecs(bss
->ts
));
1480 iwe
.u
.data
.length
= strlen(buf
);
1481 current_ev
= iwe_stream_add_point(info
, current_ev
,
1482 end_buf
, &iwe
, buf
);
1486 ieee80211_scan_add_ies(info
, ies
, ¤t_ev
, end_buf
);
1493 static int ieee80211_scan_results(struct cfg80211_registered_device
*rdev
,
1494 struct iw_request_info
*info
,
1495 char *buf
, size_t len
)
1497 char *current_ev
= buf
;
1498 char *end_buf
= buf
+ len
;
1499 struct cfg80211_internal_bss
*bss
;
1501 spin_lock_bh(&rdev
->bss_lock
);
1502 cfg80211_bss_expire(rdev
);
1504 list_for_each_entry(bss
, &rdev
->bss_list
, list
) {
1505 if (buf
+ len
- current_ev
<= IW_EV_ADDR_LEN
) {
1506 spin_unlock_bh(&rdev
->bss_lock
);
1509 current_ev
= ieee80211_bss(&rdev
->wiphy
, info
, bss
,
1510 current_ev
, end_buf
);
1512 spin_unlock_bh(&rdev
->bss_lock
);
1513 return current_ev
- buf
;
1517 int cfg80211_wext_giwscan(struct net_device
*dev
,
1518 struct iw_request_info
*info
,
1519 struct iw_point
*data
, char *extra
)
1521 struct cfg80211_registered_device
*rdev
;
1524 if (!netif_running(dev
))
1527 rdev
= cfg80211_get_dev_from_ifindex(dev_net(dev
), dev
->ifindex
);
1530 return PTR_ERR(rdev
);
1532 if (rdev
->scan_req
|| rdev
->scan_msg
)
1535 res
= ieee80211_scan_results(rdev
, info
, extra
, data
->length
);
1544 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan
);