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
*dev
,
85 struct cfg80211_internal_bss
*bss
)
87 lockdep_assert_held(&dev
->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
*dev
,
99 struct cfg80211_internal_bss
*bss
)
101 lockdep_assert_held(&dev
->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
*dev
,
118 struct cfg80211_internal_bss
*bss
)
120 lockdep_assert_held(&dev
->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
, &dev
->bss_tree
);
138 bss_ref_put(dev
, bss
);
142 static void __cfg80211_bss_expire(struct cfg80211_registered_device
*dev
,
143 unsigned long expire_time
)
145 struct cfg80211_internal_bss
*bss
, *tmp
;
146 bool expired
= false;
148 lockdep_assert_held(&dev
->bss_lock
);
150 list_for_each_entry_safe(bss
, tmp
, &dev
->bss_list
, list
) {
151 if (atomic_read(&bss
->hold
))
153 if (!time_after(expire_time
, bss
->ts
))
156 if (__cfg80211_unlink_bss(dev
, bss
))
161 dev
->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_dev(request
->wiphy
)->scan_req
);
243 request
->aborted
= aborted
;
244 request
->notified
= true;
245 queue_work(cfg80211_wq
, &wiphy_to_dev(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_dev(wiphy
)->sched_scan_req
)
282 queue_work(cfg80211_wq
,
283 &wiphy_to_dev(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_dev(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
*dev
,
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(&dev
->bss_lock
);
340 list_for_each_entry(bss
, &dev
->bss_list
, list
)
341 bss
->ts
-= age_jiffies
;
342 spin_unlock_bh(&dev
->bss_lock
);
345 void cfg80211_bss_expire(struct cfg80211_registered_device
*dev
)
347 __cfg80211_bss_expire(dev
, 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
*dev
= wiphy_to_dev(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(&dev
->bss_lock
);
546 list_for_each_entry(bss
, &dev
->bss_list
, list
) {
547 if ((bss
->pub
.capability
& capa_mask
) != capa_val
)
549 if (channel
&& bss
->pub
.channel
!= channel
)
551 /* Don't get expired BSS structs */
552 if (time_after(now
, bss
->ts
+ IEEE80211_SCAN_RESULT_EXPIRE
) &&
553 !atomic_read(&bss
->hold
))
555 if (is_bss(&bss
->pub
, bssid
, ssid
, ssid_len
)) {
557 bss_ref_get(dev
, res
);
562 spin_unlock_bh(&dev
->bss_lock
);
565 trace_cfg80211_return_bss(&res
->pub
);
568 EXPORT_SYMBOL(cfg80211_get_bss
);
570 static void rb_insert_bss(struct cfg80211_registered_device
*dev
,
571 struct cfg80211_internal_bss
*bss
)
573 struct rb_node
**p
= &dev
->bss_tree
.rb_node
;
574 struct rb_node
*parent
= NULL
;
575 struct cfg80211_internal_bss
*tbss
;
580 tbss
= rb_entry(parent
, struct cfg80211_internal_bss
, rbn
);
582 cmp
= cmp_bss(&bss
->pub
, &tbss
->pub
, BSS_CMP_REGULAR
);
585 /* will sort of leak this BSS */
595 rb_link_node(&bss
->rbn
, parent
, p
);
596 rb_insert_color(&bss
->rbn
, &dev
->bss_tree
);
599 static struct cfg80211_internal_bss
*
600 rb_find_bss(struct cfg80211_registered_device
*dev
,
601 struct cfg80211_internal_bss
*res
,
602 enum bss_compare_mode mode
)
604 struct rb_node
*n
= dev
->bss_tree
.rb_node
;
605 struct cfg80211_internal_bss
*bss
;
609 bss
= rb_entry(n
, struct cfg80211_internal_bss
, rbn
);
610 r
= cmp_bss(&res
->pub
, &bss
->pub
, mode
);
623 static bool cfg80211_combine_bsses(struct cfg80211_registered_device
*dev
,
624 struct cfg80211_internal_bss
*new)
626 const struct cfg80211_bss_ies
*ies
;
627 struct cfg80211_internal_bss
*bss
;
632 ies
= rcu_access_pointer(new->pub
.beacon_ies
);
636 ie
= cfg80211_find_ie(WLAN_EID_SSID
, ies
->data
, ies
->len
);
643 for (i
= 0; i
< ssidlen
; i
++)
647 /* not a hidden SSID */
651 /* This is the bad part ... */
653 list_for_each_entry(bss
, &dev
->bss_list
, list
) {
654 if (!ether_addr_equal(bss
->pub
.bssid
, new->pub
.bssid
))
656 if (bss
->pub
.channel
!= new->pub
.channel
)
658 if (bss
->pub
.scan_width
!= new->pub
.scan_width
)
660 if (rcu_access_pointer(bss
->pub
.beacon_ies
))
662 ies
= rcu_access_pointer(bss
->pub
.ies
);
665 ie
= cfg80211_find_ie(WLAN_EID_SSID
, ies
->data
, ies
->len
);
668 if (ssidlen
&& ie
[1] != ssidlen
)
670 if (WARN_ON_ONCE(bss
->pub
.hidden_beacon_bss
))
672 if (WARN_ON_ONCE(!list_empty(&bss
->hidden_list
)))
673 list_del(&bss
->hidden_list
);
675 list_add(&bss
->hidden_list
, &new->hidden_list
);
676 bss
->pub
.hidden_beacon_bss
= &new->pub
;
677 new->refcount
+= bss
->refcount
;
678 rcu_assign_pointer(bss
->pub
.beacon_ies
,
679 new->pub
.beacon_ies
);
685 /* Returned bss is reference counted and must be cleaned up appropriately. */
686 static struct cfg80211_internal_bss
*
687 cfg80211_bss_update(struct cfg80211_registered_device
*dev
,
688 struct cfg80211_internal_bss
*tmp
,
691 struct cfg80211_internal_bss
*found
= NULL
;
693 if (WARN_ON(!tmp
->pub
.channel
))
698 spin_lock_bh(&dev
->bss_lock
);
700 if (WARN_ON(!rcu_access_pointer(tmp
->pub
.ies
))) {
701 spin_unlock_bh(&dev
->bss_lock
);
705 found
= rb_find_bss(dev
, tmp
, BSS_CMP_REGULAR
);
709 if (rcu_access_pointer(tmp
->pub
.proberesp_ies
)) {
710 const struct cfg80211_bss_ies
*old
;
712 old
= rcu_access_pointer(found
->pub
.proberesp_ies
);
714 rcu_assign_pointer(found
->pub
.proberesp_ies
,
715 tmp
->pub
.proberesp_ies
);
716 /* Override possible earlier Beacon frame IEs */
717 rcu_assign_pointer(found
->pub
.ies
,
718 tmp
->pub
.proberesp_ies
);
720 kfree_rcu((struct cfg80211_bss_ies
*)old
,
722 } else if (rcu_access_pointer(tmp
->pub
.beacon_ies
)) {
723 const struct cfg80211_bss_ies
*old
;
724 struct cfg80211_internal_bss
*bss
;
726 if (found
->pub
.hidden_beacon_bss
&&
727 !list_empty(&found
->hidden_list
)) {
728 const struct cfg80211_bss_ies
*f
;
731 * The found BSS struct is one of the probe
732 * response members of a group, but we're
733 * receiving a beacon (beacon_ies in the tmp
734 * bss is used). This can only mean that the
735 * AP changed its beacon from not having an
736 * SSID to showing it, which is confusing so
737 * drop this information.
740 f
= rcu_access_pointer(tmp
->pub
.beacon_ies
);
741 kfree_rcu((struct cfg80211_bss_ies
*)f
,
746 old
= rcu_access_pointer(found
->pub
.beacon_ies
);
748 rcu_assign_pointer(found
->pub
.beacon_ies
,
749 tmp
->pub
.beacon_ies
);
751 /* Override IEs if they were from a beacon before */
752 if (old
== rcu_access_pointer(found
->pub
.ies
))
753 rcu_assign_pointer(found
->pub
.ies
,
754 tmp
->pub
.beacon_ies
);
756 /* Assign beacon IEs to all sub entries */
757 list_for_each_entry(bss
, &found
->hidden_list
,
759 const struct cfg80211_bss_ies
*ies
;
761 ies
= rcu_access_pointer(bss
->pub
.beacon_ies
);
764 rcu_assign_pointer(bss
->pub
.beacon_ies
,
765 tmp
->pub
.beacon_ies
);
769 kfree_rcu((struct cfg80211_bss_ies
*)old
,
773 found
->pub
.beacon_interval
= tmp
->pub
.beacon_interval
;
775 * don't update the signal if beacon was heard on
779 found
->pub
.signal
= tmp
->pub
.signal
;
780 found
->pub
.capability
= tmp
->pub
.capability
;
783 struct cfg80211_internal_bss
*new;
784 struct cfg80211_internal_bss
*hidden
;
785 struct cfg80211_bss_ies
*ies
;
788 * create a copy -- the "res" variable that is passed in
789 * is allocated on the stack since it's not needed in the
790 * more common case of an update
792 new = kzalloc(sizeof(*new) + dev
->wiphy
.bss_priv_size
,
795 ies
= (void *)rcu_dereference(tmp
->pub
.beacon_ies
);
797 kfree_rcu(ies
, rcu_head
);
798 ies
= (void *)rcu_dereference(tmp
->pub
.proberesp_ies
);
800 kfree_rcu(ies
, rcu_head
);
803 memcpy(new, tmp
, sizeof(*new));
805 INIT_LIST_HEAD(&new->hidden_list
);
807 if (rcu_access_pointer(tmp
->pub
.proberesp_ies
)) {
808 hidden
= rb_find_bss(dev
, tmp
, BSS_CMP_HIDE_ZLEN
);
810 hidden
= rb_find_bss(dev
, tmp
,
813 new->pub
.hidden_beacon_bss
= &hidden
->pub
;
814 list_add(&new->hidden_list
,
815 &hidden
->hidden_list
);
817 rcu_assign_pointer(new->pub
.beacon_ies
,
818 hidden
->pub
.beacon_ies
);
822 * Ok so we found a beacon, and don't have an entry. If
823 * it's a beacon with hidden SSID, we might be in for an
824 * expensive search for any probe responses that should
825 * be grouped with this beacon for updates ...
827 if (!cfg80211_combine_bsses(dev
, new)) {
833 list_add_tail(&new->list
, &dev
->bss_list
);
834 rb_insert_bss(dev
, new);
838 dev
->bss_generation
++;
839 bss_ref_get(dev
, found
);
840 spin_unlock_bh(&dev
->bss_lock
);
844 spin_unlock_bh(&dev
->bss_lock
);
848 static struct ieee80211_channel
*
849 cfg80211_get_bss_channel(struct wiphy
*wiphy
, const u8
*ie
, size_t ielen
,
850 struct ieee80211_channel
*channel
)
854 int channel_number
= -1;
856 tmp
= cfg80211_find_ie(WLAN_EID_DS_PARAMS
, ie
, ielen
);
857 if (tmp
&& tmp
[1] == 1) {
858 channel_number
= tmp
[2];
860 tmp
= cfg80211_find_ie(WLAN_EID_HT_OPERATION
, ie
, ielen
);
861 if (tmp
&& tmp
[1] >= sizeof(struct ieee80211_ht_operation
)) {
862 struct ieee80211_ht_operation
*htop
= (void *)(tmp
+ 2);
864 channel_number
= htop
->primary_chan
;
868 if (channel_number
< 0)
871 freq
= ieee80211_channel_to_frequency(channel_number
, channel
->band
);
872 channel
= ieee80211_get_channel(wiphy
, freq
);
875 if (channel
->flags
& IEEE80211_CHAN_DISABLED
)
880 /* Returned bss is reference counted and must be cleaned up appropriately. */
882 cfg80211_inform_bss_width(struct wiphy
*wiphy
,
883 struct ieee80211_channel
*rx_channel
,
884 enum nl80211_bss_scan_width scan_width
,
885 const u8
*bssid
, u64 tsf
, u16 capability
,
886 u16 beacon_interval
, const u8
*ie
, size_t ielen
,
887 s32 signal
, gfp_t gfp
)
889 struct cfg80211_bss_ies
*ies
;
890 struct ieee80211_channel
*channel
;
891 struct cfg80211_internal_bss tmp
= {}, *res
;
896 if (WARN_ON(wiphy
->signal_type
== CFG80211_SIGNAL_TYPE_UNSPEC
&&
897 (signal
< 0 || signal
> 100)))
900 channel
= cfg80211_get_bss_channel(wiphy
, ie
, ielen
, rx_channel
);
904 memcpy(tmp
.pub
.bssid
, bssid
, ETH_ALEN
);
905 tmp
.pub
.channel
= channel
;
906 tmp
.pub
.scan_width
= scan_width
;
907 tmp
.pub
.signal
= signal
;
908 tmp
.pub
.beacon_interval
= beacon_interval
;
909 tmp
.pub
.capability
= capability
;
911 * Since we do not know here whether the IEs are from a Beacon or Probe
912 * Response frame, we need to pick one of the options and only use it
913 * with the driver that does not provide the full Beacon/Probe Response
914 * frame. Use Beacon frame pointer to avoid indicating that this should
915 * override the IEs pointer should we have received an earlier
916 * indication of Probe Response data.
918 ies
= kmalloc(sizeof(*ies
) + ielen
, gfp
);
923 memcpy(ies
->data
, ie
, ielen
);
925 rcu_assign_pointer(tmp
.pub
.beacon_ies
, ies
);
926 rcu_assign_pointer(tmp
.pub
.ies
, ies
);
928 res
= cfg80211_bss_update(wiphy_to_dev(wiphy
), &tmp
,
929 rx_channel
== channel
);
933 if (res
->pub
.capability
& WLAN_CAPABILITY_ESS
)
934 regulatory_hint_found_beacon(wiphy
, channel
, gfp
);
936 trace_cfg80211_return_bss(&res
->pub
);
937 /* cfg80211_bss_update gives us a referenced result */
940 EXPORT_SYMBOL(cfg80211_inform_bss_width
);
942 /* Returned bss is reference counted and must be cleaned up appropriately. */
943 struct cfg80211_bss
*
944 cfg80211_inform_bss_width_frame(struct wiphy
*wiphy
,
945 struct ieee80211_channel
*rx_channel
,
946 enum nl80211_bss_scan_width scan_width
,
947 struct ieee80211_mgmt
*mgmt
, size_t len
,
948 s32 signal
, gfp_t gfp
)
950 struct cfg80211_internal_bss tmp
= {}, *res
;
951 struct cfg80211_bss_ies
*ies
;
952 struct ieee80211_channel
*channel
;
953 size_t ielen
= len
- offsetof(struct ieee80211_mgmt
,
954 u
.probe_resp
.variable
);
956 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt
, u
.probe_resp
.variable
) !=
957 offsetof(struct ieee80211_mgmt
, u
.beacon
.variable
));
959 trace_cfg80211_inform_bss_width_frame(wiphy
, rx_channel
, scan_width
, mgmt
,
968 if (WARN_ON(wiphy
->signal_type
== CFG80211_SIGNAL_TYPE_UNSPEC
&&
969 (signal
< 0 || signal
> 100)))
972 if (WARN_ON(len
< offsetof(struct ieee80211_mgmt
, u
.probe_resp
.variable
)))
975 channel
= cfg80211_get_bss_channel(wiphy
, mgmt
->u
.beacon
.variable
,
980 ies
= kmalloc(sizeof(*ies
) + ielen
, gfp
);
984 ies
->tsf
= le64_to_cpu(mgmt
->u
.probe_resp
.timestamp
);
985 memcpy(ies
->data
, mgmt
->u
.probe_resp
.variable
, ielen
);
987 if (ieee80211_is_probe_resp(mgmt
->frame_control
))
988 rcu_assign_pointer(tmp
.pub
.proberesp_ies
, ies
);
990 rcu_assign_pointer(tmp
.pub
.beacon_ies
, ies
);
991 rcu_assign_pointer(tmp
.pub
.ies
, ies
);
993 memcpy(tmp
.pub
.bssid
, mgmt
->bssid
, ETH_ALEN
);
994 tmp
.pub
.channel
= channel
;
995 tmp
.pub
.scan_width
= scan_width
;
996 tmp
.pub
.signal
= signal
;
997 tmp
.pub
.beacon_interval
= le16_to_cpu(mgmt
->u
.probe_resp
.beacon_int
);
998 tmp
.pub
.capability
= le16_to_cpu(mgmt
->u
.probe_resp
.capab_info
);
1000 res
= cfg80211_bss_update(wiphy_to_dev(wiphy
), &tmp
,
1001 rx_channel
== channel
);
1005 if (res
->pub
.capability
& WLAN_CAPABILITY_ESS
)
1006 regulatory_hint_found_beacon(wiphy
, channel
, gfp
);
1008 trace_cfg80211_return_bss(&res
->pub
);
1009 /* cfg80211_bss_update gives us a referenced result */
1012 EXPORT_SYMBOL(cfg80211_inform_bss_width_frame
);
1014 void cfg80211_ref_bss(struct wiphy
*wiphy
, struct cfg80211_bss
*pub
)
1016 struct cfg80211_registered_device
*dev
= wiphy_to_dev(wiphy
);
1017 struct cfg80211_internal_bss
*bss
;
1022 bss
= container_of(pub
, struct cfg80211_internal_bss
, pub
);
1024 spin_lock_bh(&dev
->bss_lock
);
1025 bss_ref_get(dev
, bss
);
1026 spin_unlock_bh(&dev
->bss_lock
);
1028 EXPORT_SYMBOL(cfg80211_ref_bss
);
1030 void cfg80211_put_bss(struct wiphy
*wiphy
, struct cfg80211_bss
*pub
)
1032 struct cfg80211_registered_device
*dev
= wiphy_to_dev(wiphy
);
1033 struct cfg80211_internal_bss
*bss
;
1038 bss
= container_of(pub
, struct cfg80211_internal_bss
, pub
);
1040 spin_lock_bh(&dev
->bss_lock
);
1041 bss_ref_put(dev
, bss
);
1042 spin_unlock_bh(&dev
->bss_lock
);
1044 EXPORT_SYMBOL(cfg80211_put_bss
);
1046 void cfg80211_unlink_bss(struct wiphy
*wiphy
, struct cfg80211_bss
*pub
)
1048 struct cfg80211_registered_device
*dev
= wiphy_to_dev(wiphy
);
1049 struct cfg80211_internal_bss
*bss
;
1054 bss
= container_of(pub
, struct cfg80211_internal_bss
, pub
);
1056 spin_lock_bh(&dev
->bss_lock
);
1057 if (!list_empty(&bss
->list
)) {
1058 if (__cfg80211_unlink_bss(dev
, bss
))
1059 dev
->bss_generation
++;
1061 spin_unlock_bh(&dev
->bss_lock
);
1063 EXPORT_SYMBOL(cfg80211_unlink_bss
);
1065 #ifdef CONFIG_CFG80211_WEXT
1066 static struct cfg80211_registered_device
*
1067 cfg80211_get_dev_from_ifindex(struct net
*net
, int ifindex
)
1069 struct cfg80211_registered_device
*rdev
;
1070 struct net_device
*dev
;
1074 dev
= dev_get_by_index(net
, ifindex
);
1076 return ERR_PTR(-ENODEV
);
1077 if (dev
->ieee80211_ptr
)
1078 rdev
= wiphy_to_dev(dev
->ieee80211_ptr
->wiphy
);
1080 rdev
= ERR_PTR(-ENODEV
);
1085 int cfg80211_wext_siwscan(struct net_device
*dev
,
1086 struct iw_request_info
*info
,
1087 union iwreq_data
*wrqu
, char *extra
)
1089 struct cfg80211_registered_device
*rdev
;
1090 struct wiphy
*wiphy
;
1091 struct iw_scan_req
*wreq
= NULL
;
1092 struct cfg80211_scan_request
*creq
= NULL
;
1093 int i
, err
, n_channels
= 0;
1094 enum ieee80211_band band
;
1096 if (!netif_running(dev
))
1099 if (wrqu
->data
.length
== sizeof(struct iw_scan_req
))
1100 wreq
= (struct iw_scan_req
*)extra
;
1102 rdev
= cfg80211_get_dev_from_ifindex(dev_net(dev
), dev
->ifindex
);
1105 return PTR_ERR(rdev
);
1107 if (rdev
->scan_req
|| rdev
->scan_msg
) {
1112 wiphy
= &rdev
->wiphy
;
1114 /* Determine number of channels, needed to allocate creq */
1115 if (wreq
&& wreq
->num_channels
)
1116 n_channels
= wreq
->num_channels
;
1118 n_channels
= ieee80211_get_num_supported_channels(wiphy
);
1120 creq
= kzalloc(sizeof(*creq
) + sizeof(struct cfg80211_ssid
) +
1121 n_channels
* sizeof(void *),
1128 creq
->wiphy
= wiphy
;
1129 creq
->wdev
= dev
->ieee80211_ptr
;
1130 /* SSIDs come after channels */
1131 creq
->ssids
= (void *)&creq
->channels
[n_channels
];
1132 creq
->n_channels
= n_channels
;
1134 creq
->scan_start
= jiffies
;
1136 /* translate "Scan on frequencies" request */
1138 for (band
= 0; band
< IEEE80211_NUM_BANDS
; band
++) {
1141 if (!wiphy
->bands
[band
])
1144 for (j
= 0; j
< wiphy
->bands
[band
]->n_channels
; j
++) {
1145 /* ignore disabled channels */
1146 if (wiphy
->bands
[band
]->channels
[j
].flags
&
1147 IEEE80211_CHAN_DISABLED
)
1150 /* If we have a wireless request structure and the
1151 * wireless request specifies frequencies, then search
1152 * for the matching hardware channel.
1154 if (wreq
&& wreq
->num_channels
) {
1156 int wiphy_freq
= wiphy
->bands
[band
]->channels
[j
].center_freq
;
1157 for (k
= 0; k
< wreq
->num_channels
; k
++) {
1158 int wext_freq
= cfg80211_wext_freq(wiphy
, &wreq
->channel_list
[k
]);
1159 if (wext_freq
== wiphy_freq
)
1160 goto wext_freq_found
;
1162 goto wext_freq_not_found
;
1166 creq
->channels
[i
] = &wiphy
->bands
[band
]->channels
[j
];
1168 wext_freq_not_found
: ;
1171 /* No channels found? */
1177 /* Set real number of channels specified in creq->channels[] */
1178 creq
->n_channels
= i
;
1180 /* translate "Scan for SSID" request */
1182 if (wrqu
->data
.flags
& IW_SCAN_THIS_ESSID
) {
1183 if (wreq
->essid_len
> IEEE80211_MAX_SSID_LEN
) {
1187 memcpy(creq
->ssids
[0].ssid
, wreq
->essid
, wreq
->essid_len
);
1188 creq
->ssids
[0].ssid_len
= wreq
->essid_len
;
1190 if (wreq
->scan_type
== IW_SCAN_TYPE_PASSIVE
)
1194 for (i
= 0; i
< IEEE80211_NUM_BANDS
; i
++)
1195 if (wiphy
->bands
[i
])
1196 creq
->rates
[i
] = (1 << wiphy
->bands
[i
]->n_bitrates
) - 1;
1198 rdev
->scan_req
= creq
;
1199 err
= rdev_scan(rdev
, creq
);
1201 rdev
->scan_req
= NULL
;
1202 /* creq will be freed below */
1204 nl80211_send_scan_start(rdev
, dev
->ieee80211_ptr
);
1205 /* creq now owned by driver */
1213 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan
);
1215 static void ieee80211_scan_add_ies(struct iw_request_info
*info
,
1216 const struct cfg80211_bss_ies
*ies
,
1217 char **current_ev
, char *end_buf
)
1219 const u8
*pos
, *end
, *next
;
1220 struct iw_event iwe
;
1226 * If needed, fragment the IEs buffer (at IE boundaries) into short
1227 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
1230 end
= pos
+ ies
->len
;
1232 while (end
- pos
> IW_GENERIC_IE_MAX
) {
1233 next
= pos
+ 2 + pos
[1];
1234 while (next
+ 2 + next
[1] - pos
< IW_GENERIC_IE_MAX
)
1235 next
= next
+ 2 + next
[1];
1237 memset(&iwe
, 0, sizeof(iwe
));
1238 iwe
.cmd
= IWEVGENIE
;
1239 iwe
.u
.data
.length
= next
- pos
;
1240 *current_ev
= iwe_stream_add_point(info
, *current_ev
,
1248 memset(&iwe
, 0, sizeof(iwe
));
1249 iwe
.cmd
= IWEVGENIE
;
1250 iwe
.u
.data
.length
= end
- pos
;
1251 *current_ev
= iwe_stream_add_point(info
, *current_ev
,
1258 ieee80211_bss(struct wiphy
*wiphy
, struct iw_request_info
*info
,
1259 struct cfg80211_internal_bss
*bss
, char *current_ev
,
1262 const struct cfg80211_bss_ies
*ies
;
1263 struct iw_event iwe
;
1267 bool ismesh
= false;
1269 memset(&iwe
, 0, sizeof(iwe
));
1270 iwe
.cmd
= SIOCGIWAP
;
1271 iwe
.u
.ap_addr
.sa_family
= ARPHRD_ETHER
;
1272 memcpy(iwe
.u
.ap_addr
.sa_data
, bss
->pub
.bssid
, ETH_ALEN
);
1273 current_ev
= iwe_stream_add_event(info
, current_ev
, end_buf
, &iwe
,
1276 memset(&iwe
, 0, sizeof(iwe
));
1277 iwe
.cmd
= SIOCGIWFREQ
;
1278 iwe
.u
.freq
.m
= ieee80211_frequency_to_channel(bss
->pub
.channel
->center_freq
);
1280 current_ev
= iwe_stream_add_event(info
, current_ev
, end_buf
, &iwe
,
1283 memset(&iwe
, 0, sizeof(iwe
));
1284 iwe
.cmd
= SIOCGIWFREQ
;
1285 iwe
.u
.freq
.m
= bss
->pub
.channel
->center_freq
;
1287 current_ev
= iwe_stream_add_event(info
, current_ev
, end_buf
, &iwe
,
1290 if (wiphy
->signal_type
!= CFG80211_SIGNAL_TYPE_NONE
) {
1291 memset(&iwe
, 0, sizeof(iwe
));
1293 iwe
.u
.qual
.updated
= IW_QUAL_LEVEL_UPDATED
|
1294 IW_QUAL_NOISE_INVALID
|
1295 IW_QUAL_QUAL_UPDATED
;
1296 switch (wiphy
->signal_type
) {
1297 case CFG80211_SIGNAL_TYPE_MBM
:
1298 sig
= bss
->pub
.signal
/ 100;
1299 iwe
.u
.qual
.level
= sig
;
1300 iwe
.u
.qual
.updated
|= IW_QUAL_DBM
;
1301 if (sig
< -110) /* rather bad */
1303 else if (sig
> -40) /* perfect */
1305 /* will give a range of 0 .. 70 */
1306 iwe
.u
.qual
.qual
= sig
+ 110;
1308 case CFG80211_SIGNAL_TYPE_UNSPEC
:
1309 iwe
.u
.qual
.level
= bss
->pub
.signal
;
1310 /* will give range 0 .. 100 */
1311 iwe
.u
.qual
.qual
= bss
->pub
.signal
;
1317 current_ev
= iwe_stream_add_event(info
, current_ev
, end_buf
,
1318 &iwe
, IW_EV_QUAL_LEN
);
1321 memset(&iwe
, 0, sizeof(iwe
));
1322 iwe
.cmd
= SIOCGIWENCODE
;
1323 if (bss
->pub
.capability
& WLAN_CAPABILITY_PRIVACY
)
1324 iwe
.u
.data
.flags
= IW_ENCODE_ENABLED
| IW_ENCODE_NOKEY
;
1326 iwe
.u
.data
.flags
= IW_ENCODE_DISABLED
;
1327 iwe
.u
.data
.length
= 0;
1328 current_ev
= iwe_stream_add_point(info
, current_ev
, end_buf
,
1332 ies
= rcu_dereference(bss
->pub
.ies
);
1338 if (ie
[1] > rem
- 2)
1343 memset(&iwe
, 0, sizeof(iwe
));
1344 iwe
.cmd
= SIOCGIWESSID
;
1345 iwe
.u
.data
.length
= ie
[1];
1346 iwe
.u
.data
.flags
= 1;
1347 current_ev
= iwe_stream_add_point(info
, current_ev
, end_buf
,
1348 &iwe
, (u8
*)ie
+ 2);
1350 case WLAN_EID_MESH_ID
:
1351 memset(&iwe
, 0, sizeof(iwe
));
1352 iwe
.cmd
= SIOCGIWESSID
;
1353 iwe
.u
.data
.length
= ie
[1];
1354 iwe
.u
.data
.flags
= 1;
1355 current_ev
= iwe_stream_add_point(info
, current_ev
, end_buf
,
1356 &iwe
, (u8
*)ie
+ 2);
1358 case WLAN_EID_MESH_CONFIG
:
1360 if (ie
[1] != sizeof(struct ieee80211_meshconf_ie
))
1362 buf
= kmalloc(50, GFP_ATOMIC
);
1366 memset(&iwe
, 0, sizeof(iwe
));
1367 iwe
.cmd
= IWEVCUSTOM
;
1368 sprintf(buf
, "Mesh Network Path Selection Protocol ID: "
1370 iwe
.u
.data
.length
= strlen(buf
);
1371 current_ev
= iwe_stream_add_point(info
, current_ev
,
1374 sprintf(buf
, "Path Selection Metric ID: 0x%02X",
1376 iwe
.u
.data
.length
= strlen(buf
);
1377 current_ev
= iwe_stream_add_point(info
, current_ev
,
1380 sprintf(buf
, "Congestion Control Mode ID: 0x%02X",
1382 iwe
.u
.data
.length
= strlen(buf
);
1383 current_ev
= iwe_stream_add_point(info
, current_ev
,
1386 sprintf(buf
, "Synchronization ID: 0x%02X", cfg
[3]);
1387 iwe
.u
.data
.length
= strlen(buf
);
1388 current_ev
= iwe_stream_add_point(info
, current_ev
,
1391 sprintf(buf
, "Authentication ID: 0x%02X", cfg
[4]);
1392 iwe
.u
.data
.length
= strlen(buf
);
1393 current_ev
= iwe_stream_add_point(info
, current_ev
,
1396 sprintf(buf
, "Formation Info: 0x%02X", cfg
[5]);
1397 iwe
.u
.data
.length
= strlen(buf
);
1398 current_ev
= iwe_stream_add_point(info
, current_ev
,
1401 sprintf(buf
, "Capabilities: 0x%02X", cfg
[6]);
1402 iwe
.u
.data
.length
= strlen(buf
);
1403 current_ev
= iwe_stream_add_point(info
, current_ev
,
1408 case WLAN_EID_SUPP_RATES
:
1409 case WLAN_EID_EXT_SUPP_RATES
:
1410 /* display all supported rates in readable format */
1411 p
= current_ev
+ iwe_stream_lcp_len(info
);
1413 memset(&iwe
, 0, sizeof(iwe
));
1414 iwe
.cmd
= SIOCGIWRATE
;
1415 /* Those two flags are ignored... */
1416 iwe
.u
.bitrate
.fixed
= iwe
.u
.bitrate
.disabled
= 0;
1418 for (i
= 0; i
< ie
[1]; i
++) {
1419 iwe
.u
.bitrate
.value
=
1420 ((ie
[i
+ 2] & 0x7f) * 500000);
1421 p
= iwe_stream_add_value(info
, current_ev
, p
,
1422 end_buf
, &iwe
, IW_EV_PARAM_LEN
);
1431 if (bss
->pub
.capability
& (WLAN_CAPABILITY_ESS
| WLAN_CAPABILITY_IBSS
) ||
1433 memset(&iwe
, 0, sizeof(iwe
));
1434 iwe
.cmd
= SIOCGIWMODE
;
1436 iwe
.u
.mode
= IW_MODE_MESH
;
1437 else if (bss
->pub
.capability
& WLAN_CAPABILITY_ESS
)
1438 iwe
.u
.mode
= IW_MODE_MASTER
;
1440 iwe
.u
.mode
= IW_MODE_ADHOC
;
1441 current_ev
= iwe_stream_add_event(info
, current_ev
, end_buf
,
1442 &iwe
, IW_EV_UINT_LEN
);
1445 buf
= kmalloc(31, GFP_ATOMIC
);
1447 memset(&iwe
, 0, sizeof(iwe
));
1448 iwe
.cmd
= IWEVCUSTOM
;
1449 sprintf(buf
, "tsf=%016llx", (unsigned long long)(ies
->tsf
));
1450 iwe
.u
.data
.length
= strlen(buf
);
1451 current_ev
= iwe_stream_add_point(info
, current_ev
, end_buf
,
1453 memset(&iwe
, 0, sizeof(iwe
));
1454 iwe
.cmd
= IWEVCUSTOM
;
1455 sprintf(buf
, " Last beacon: %ums ago",
1456 elapsed_jiffies_msecs(bss
->ts
));
1457 iwe
.u
.data
.length
= strlen(buf
);
1458 current_ev
= iwe_stream_add_point(info
, current_ev
,
1459 end_buf
, &iwe
, buf
);
1463 ieee80211_scan_add_ies(info
, ies
, ¤t_ev
, end_buf
);
1470 static int ieee80211_scan_results(struct cfg80211_registered_device
*dev
,
1471 struct iw_request_info
*info
,
1472 char *buf
, size_t len
)
1474 char *current_ev
= buf
;
1475 char *end_buf
= buf
+ len
;
1476 struct cfg80211_internal_bss
*bss
;
1478 spin_lock_bh(&dev
->bss_lock
);
1479 cfg80211_bss_expire(dev
);
1481 list_for_each_entry(bss
, &dev
->bss_list
, list
) {
1482 if (buf
+ len
- current_ev
<= IW_EV_ADDR_LEN
) {
1483 spin_unlock_bh(&dev
->bss_lock
);
1486 current_ev
= ieee80211_bss(&dev
->wiphy
, info
, bss
,
1487 current_ev
, end_buf
);
1489 spin_unlock_bh(&dev
->bss_lock
);
1490 return current_ev
- buf
;
1494 int cfg80211_wext_giwscan(struct net_device
*dev
,
1495 struct iw_request_info
*info
,
1496 struct iw_point
*data
, char *extra
)
1498 struct cfg80211_registered_device
*rdev
;
1501 if (!netif_running(dev
))
1504 rdev
= cfg80211_get_dev_from_ifindex(dev_net(dev
), dev
->ifindex
);
1507 return PTR_ERR(rdev
);
1509 if (rdev
->scan_req
|| rdev
->scan_msg
)
1512 res
= ieee80211_scan_results(rdev
, info
, extra
, data
->length
);
1521 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan
);