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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>
13#include <net/arp.h>
14#include <net/cfg80211.h>
15#include <net/cfg80211-wext.h>
16#include <net/iw_handler.h>
17#include "core.h"
18#include "nl80211.h"
19#include "wext-compat.h"
20#include "rdev-ops.h"
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57
58#define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ)
59
60static void bss_free(struct cfg80211_internal_bss *bss)
61{
62 struct cfg80211_bss_ies *ies;
63
64 if (WARN_ON(atomic_read(&bss->hold)))
65 return;
66
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);
71 if (ies)
72 kfree_rcu(ies, rcu_head);
73
74
75
76
77
78 if (!list_empty(&bss->hidden_list))
79 list_del(&bss->hidden_list);
80
81 kfree(bss);
82}
83
84static inline void bss_ref_get(struct cfg80211_registered_device *dev,
85 struct cfg80211_internal_bss *bss)
86{
87 lockdep_assert_held(&dev->bss_lock);
88
89 bss->refcount++;
90 if (bss->pub.hidden_beacon_bss) {
91 bss = container_of(bss->pub.hidden_beacon_bss,
92 struct cfg80211_internal_bss,
93 pub);
94 bss->refcount++;
95 }
96}
97
98static inline void bss_ref_put(struct cfg80211_registered_device *dev,
99 struct cfg80211_internal_bss *bss)
100{
101 lockdep_assert_held(&dev->bss_lock);
102
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,
107 pub);
108 hbss->refcount--;
109 if (hbss->refcount == 0)
110 bss_free(hbss);
111 }
112 bss->refcount--;
113 if (bss->refcount == 0)
114 bss_free(bss);
115}
116
117static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *dev,
118 struct cfg80211_internal_bss *bss)
119{
120 lockdep_assert_held(&dev->bss_lock);
121
122 if (!list_empty(&bss->hidden_list)) {
123
124
125
126
127 if (!bss->pub.hidden_beacon_bss)
128 return false;
129
130
131
132
133 list_del_init(&bss->hidden_list);
134 }
135
136 list_del_init(&bss->list);
137 rb_erase(&bss->rbn, &dev->bss_tree);
138 bss_ref_put(dev, bss);
139 return true;
140}
141
142static void __cfg80211_bss_expire(struct cfg80211_registered_device *dev,
143 unsigned long expire_time)
144{
145 struct cfg80211_internal_bss *bss, *tmp;
146 bool expired = false;
147
148 lockdep_assert_held(&dev->bss_lock);
149
150 list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
151 if (atomic_read(&bss->hold))
152 continue;
153 if (!time_after(expire_time, bss->ts))
154 continue;
155
156 if (__cfg80211_unlink_bss(dev, bss))
157 expired = true;
158 }
159
160 if (expired)
161 dev->bss_generation++;
162}
163
164void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
165 bool send_message)
166{
167 struct cfg80211_scan_request *request;
168 struct wireless_dev *wdev;
169 struct sk_buff *msg;
170#ifdef CONFIG_CFG80211_WEXT
171 union iwreq_data wrqu;
172#endif
173
174 ASSERT_RTNL();
175
176 if (rdev->scan_msg) {
177 nl80211_send_scan_result(rdev, rdev->scan_msg);
178 rdev->scan_msg = NULL;
179 return;
180 }
181
182 request = rdev->scan_req;
183 if (!request)
184 return;
185
186 wdev = request->wdev;
187
188
189
190
191
192
193 if (wdev->netdev)
194 cfg80211_sme_scan_done(wdev->netdev);
195
196 if (!request->aborted &&
197 request->flags & NL80211_SCAN_FLAG_FLUSH) {
198
199 spin_lock_bh(&rdev->bss_lock);
200 __cfg80211_bss_expire(rdev, request->scan_start);
201 spin_unlock_bh(&rdev->bss_lock);
202 }
203
204 msg = nl80211_build_scan_msg(rdev, wdev, request->aborted);
205
206#ifdef CONFIG_CFG80211_WEXT
207 if (wdev->netdev && !request->aborted) {
208 memset(&wrqu, 0, sizeof(wrqu));
209
210 wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
211 }
212#endif
213
214 if (wdev->netdev)
215 dev_put(wdev->netdev);
216
217 rdev->scan_req = NULL;
218 kfree(request);
219
220 if (!send_message)
221 rdev->scan_msg = msg;
222 else
223 nl80211_send_scan_result(rdev, msg);
224}
225
226void __cfg80211_scan_done(struct work_struct *wk)
227{
228 struct cfg80211_registered_device *rdev;
229
230 rdev = container_of(wk, struct cfg80211_registered_device,
231 scan_done_wk);
232
233 rtnl_lock();
234 ___cfg80211_scan_done(rdev, true);
235 rtnl_unlock();
236}
237
238void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
239{
240 trace_cfg80211_scan_done(request, aborted);
241 WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);
242
243 request->aborted = aborted;
244 request->notified = true;
245 queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk);
246}
247EXPORT_SYMBOL(cfg80211_scan_done);
248
249void __cfg80211_sched_scan_results(struct work_struct *wk)
250{
251 struct cfg80211_registered_device *rdev;
252 struct cfg80211_sched_scan_request *request;
253
254 rdev = container_of(wk, struct cfg80211_registered_device,
255 sched_scan_results_wk);
256
257 rtnl_lock();
258
259 request = rdev->sched_scan_req;
260
261
262 if (request) {
263 if (request->flags & NL80211_SCAN_FLAG_FLUSH) {
264
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);
270 }
271 nl80211_send_sched_scan_results(rdev, request->dev);
272 }
273
274 rtnl_unlock();
275}
276
277void cfg80211_sched_scan_results(struct wiphy *wiphy)
278{
279 trace_cfg80211_sched_scan_results(wiphy);
280
281 if (wiphy_to_dev(wiphy)->sched_scan_req)
282 queue_work(cfg80211_wq,
283 &wiphy_to_dev(wiphy)->sched_scan_results_wk);
284}
285EXPORT_SYMBOL(cfg80211_sched_scan_results);
286
287void cfg80211_sched_scan_stopped(struct wiphy *wiphy)
288{
289 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
290
291 trace_cfg80211_sched_scan_stopped(wiphy);
292
293 rtnl_lock();
294 __cfg80211_stop_sched_scan(rdev, true);
295 rtnl_unlock();
296}
297EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
298
299int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
300 bool driver_initiated)
301{
302 struct net_device *dev;
303
304 ASSERT_RTNL();
305
306 if (!rdev->sched_scan_req)
307 return -ENOENT;
308
309 dev = rdev->sched_scan_req->dev;
310
311 if (!driver_initiated) {
312 int err = rdev_sched_scan_stop(rdev, dev);
313 if (err)
314 return err;
315 }
316
317 nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED);
318
319 kfree(rdev->sched_scan_req);
320 rdev->sched_scan_req = NULL;
321
322 return 0;
323}
324
325void cfg80211_bss_age(struct cfg80211_registered_device *dev,
326 unsigned long age_secs)
327{
328 struct cfg80211_internal_bss *bss;
329 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
330
331 spin_lock_bh(&dev->bss_lock);
332 list_for_each_entry(bss, &dev->bss_list, list)
333 bss->ts -= age_jiffies;
334 spin_unlock_bh(&dev->bss_lock);
335}
336
337void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
338{
339 __cfg80211_bss_expire(dev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
340}
341
342const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len)
343{
344 while (len > 2 && ies[0] != eid) {
345 len -= ies[1] + 2;
346 ies += ies[1] + 2;
347 }
348 if (len < 2)
349 return NULL;
350 if (len < 2 + ies[1])
351 return NULL;
352 return ies;
353}
354EXPORT_SYMBOL(cfg80211_find_ie);
355
356const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type,
357 const u8 *ies, int len)
358{
359 struct ieee80211_vendor_ie *ie;
360 const u8 *pos = ies, *end = ies + len;
361 int ie_oui;
362
363 while (pos < end) {
364 pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos,
365 end - pos);
366 if (!pos)
367 return NULL;
368
369 ie = (struct ieee80211_vendor_ie *)pos;
370
371
372 BUILD_BUG_ON(offsetof(struct ieee80211_vendor_ie, len) != 1);
373
374 if (ie->len < sizeof(*ie))
375 goto cont;
376
377 ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2];
378 if (ie_oui == oui && ie->oui_type == oui_type)
379 return pos;
380cont:
381 pos += 2 + ie->len;
382 }
383 return NULL;
384}
385EXPORT_SYMBOL(cfg80211_find_vendor_ie);
386
387static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
388 const u8 *ssid, size_t ssid_len)
389{
390 const struct cfg80211_bss_ies *ies;
391 const u8 *ssidie;
392
393 if (bssid && !ether_addr_equal(a->bssid, bssid))
394 return false;
395
396 if (!ssid)
397 return true;
398
399 ies = rcu_access_pointer(a->ies);
400 if (!ies)
401 return false;
402 ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
403 if (!ssidie)
404 return false;
405 if (ssidie[1] != ssid_len)
406 return false;
407 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
408}
409
410
411
412
413
414
415
416enum bss_compare_mode {
417 BSS_CMP_REGULAR,
418 BSS_CMP_HIDE_ZLEN,
419 BSS_CMP_HIDE_NUL,
420};
421
422static int cmp_bss(struct cfg80211_bss *a,
423 struct cfg80211_bss *b,
424 enum bss_compare_mode mode)
425{
426 const struct cfg80211_bss_ies *a_ies, *b_ies;
427 const u8 *ie1 = NULL;
428 const u8 *ie2 = NULL;
429 int i, r;
430
431 if (a->channel != b->channel)
432 return b->channel->center_freq - a->channel->center_freq;
433
434 a_ies = rcu_access_pointer(a->ies);
435 if (!a_ies)
436 return -1;
437 b_ies = rcu_access_pointer(b->ies);
438 if (!b_ies)
439 return 1;
440
441 if (WLAN_CAPABILITY_IS_STA_BSS(a->capability))
442 ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID,
443 a_ies->data, a_ies->len);
444 if (WLAN_CAPABILITY_IS_STA_BSS(b->capability))
445 ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID,
446 b_ies->data, b_ies->len);
447 if (ie1 && ie2) {
448 int mesh_id_cmp;
449
450 if (ie1[1] == ie2[1])
451 mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]);
452 else
453 mesh_id_cmp = ie2[1] - ie1[1];
454
455 ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
456 a_ies->data, a_ies->len);
457 ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
458 b_ies->data, b_ies->len);
459 if (ie1 && ie2) {
460 if (mesh_id_cmp)
461 return mesh_id_cmp;
462 if (ie1[1] != ie2[1])
463 return ie2[1] - ie1[1];
464 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
465 }
466 }
467
468 r = memcmp(a->bssid, b->bssid, sizeof(a->bssid));
469 if (r)
470 return r;
471
472 ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
473 ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
474
475 if (!ie1 && !ie2)
476 return 0;
477
478
479
480
481
482
483
484
485 if (!ie1)
486 return -1;
487 if (!ie2)
488 return 1;
489
490 switch (mode) {
491 case BSS_CMP_HIDE_ZLEN:
492
493
494
495
496
497
498
499
500
501
502
503
504 return ie2[1];
505 case BSS_CMP_REGULAR:
506 default:
507
508 if (ie1[1] != ie2[1])
509 return ie2[1] - ie1[1];
510 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
511 case BSS_CMP_HIDE_NUL:
512 if (ie1[1] != ie2[1])
513 return ie2[1] - ie1[1];
514
515 for (i = 0; i < ie2[1]; i++)
516 if (ie2[i + 2])
517 return -1;
518 return 0;
519 }
520}
521
522
523struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
524 struct ieee80211_channel *channel,
525 const u8 *bssid,
526 const u8 *ssid, size_t ssid_len,
527 u16 capa_mask, u16 capa_val)
528{
529 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
530 struct cfg80211_internal_bss *bss, *res = NULL;
531 unsigned long now = jiffies;
532
533 trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, capa_mask,
534 capa_val);
535
536 spin_lock_bh(&dev->bss_lock);
537
538 list_for_each_entry(bss, &dev->bss_list, list) {
539 if ((bss->pub.capability & capa_mask) != capa_val)
540 continue;
541 if (channel && bss->pub.channel != channel)
542 continue;
543
544 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
545 !atomic_read(&bss->hold))
546 continue;
547 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
548 res = bss;
549 bss_ref_get(dev, res);
550 break;
551 }
552 }
553
554 spin_unlock_bh(&dev->bss_lock);
555 if (!res)
556 return NULL;
557 trace_cfg80211_return_bss(&res->pub);
558 return &res->pub;
559}
560EXPORT_SYMBOL(cfg80211_get_bss);
561
562static void rb_insert_bss(struct cfg80211_registered_device *dev,
563 struct cfg80211_internal_bss *bss)
564{
565 struct rb_node **p = &dev->bss_tree.rb_node;
566 struct rb_node *parent = NULL;
567 struct cfg80211_internal_bss *tbss;
568 int cmp;
569
570 while (*p) {
571 parent = *p;
572 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
573
574 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR);
575
576 if (WARN_ON(!cmp)) {
577
578 return;
579 }
580
581 if (cmp < 0)
582 p = &(*p)->rb_left;
583 else
584 p = &(*p)->rb_right;
585 }
586
587 rb_link_node(&bss->rbn, parent, p);
588 rb_insert_color(&bss->rbn, &dev->bss_tree);
589}
590
591static struct cfg80211_internal_bss *
592rb_find_bss(struct cfg80211_registered_device *dev,
593 struct cfg80211_internal_bss *res,
594 enum bss_compare_mode mode)
595{
596 struct rb_node *n = dev->bss_tree.rb_node;
597 struct cfg80211_internal_bss *bss;
598 int r;
599
600 while (n) {
601 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
602 r = cmp_bss(&res->pub, &bss->pub, mode);
603
604 if (r == 0)
605 return bss;
606 else if (r < 0)
607 n = n->rb_left;
608 else
609 n = n->rb_right;
610 }
611
612 return NULL;
613}
614
615static bool cfg80211_combine_bsses(struct cfg80211_registered_device *dev,
616 struct cfg80211_internal_bss *new)
617{
618 const struct cfg80211_bss_ies *ies;
619 struct cfg80211_internal_bss *bss;
620 const u8 *ie;
621 int i, ssidlen;
622 u8 fold = 0;
623
624 ies = rcu_access_pointer(new->pub.beacon_ies);
625 if (WARN_ON(!ies))
626 return false;
627
628 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
629 if (!ie) {
630
631 return true;
632 }
633
634 ssidlen = ie[1];
635 for (i = 0; i < ssidlen; i++)
636 fold |= ie[2 + i];
637
638 if (fold) {
639
640 return true;
641 }
642
643
644
645 list_for_each_entry(bss, &dev->bss_list, list) {
646 if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid))
647 continue;
648 if (bss->pub.channel != new->pub.channel)
649 continue;
650 if (bss->pub.scan_width != new->pub.scan_width)
651 continue;
652 if (rcu_access_pointer(bss->pub.beacon_ies))
653 continue;
654 ies = rcu_access_pointer(bss->pub.ies);
655 if (!ies)
656 continue;
657 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
658 if (!ie)
659 continue;
660 if (ssidlen && ie[1] != ssidlen)
661 continue;
662
663 if (bss->pub.beacon_ies)
664 continue;
665 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss))
666 continue;
667 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list)))
668 list_del(&bss->hidden_list);
669
670 list_add(&bss->hidden_list, &new->hidden_list);
671 bss->pub.hidden_beacon_bss = &new->pub;
672 new->refcount += bss->refcount;
673 rcu_assign_pointer(bss->pub.beacon_ies,
674 new->pub.beacon_ies);
675 }
676
677 return true;
678}
679
680
681static struct cfg80211_internal_bss *
682cfg80211_bss_update(struct cfg80211_registered_device *dev,
683 struct cfg80211_internal_bss *tmp)
684{
685 struct cfg80211_internal_bss *found = NULL;
686
687 if (WARN_ON(!tmp->pub.channel))
688 return NULL;
689
690 tmp->ts = jiffies;
691
692 spin_lock_bh(&dev->bss_lock);
693
694 if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
695 spin_unlock_bh(&dev->bss_lock);
696 return NULL;
697 }
698
699 found = rb_find_bss(dev, tmp, BSS_CMP_REGULAR);
700
701 if (found) {
702
703 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
704 const struct cfg80211_bss_ies *old;
705
706 old = rcu_access_pointer(found->pub.proberesp_ies);
707
708 rcu_assign_pointer(found->pub.proberesp_ies,
709 tmp->pub.proberesp_ies);
710
711 rcu_assign_pointer(found->pub.ies,
712 tmp->pub.proberesp_ies);
713 if (old)
714 kfree_rcu((struct cfg80211_bss_ies *)old,
715 rcu_head);
716 } else if (rcu_access_pointer(tmp->pub.beacon_ies)) {
717 const struct cfg80211_bss_ies *old;
718 struct cfg80211_internal_bss *bss;
719
720 if (found->pub.hidden_beacon_bss &&
721 !list_empty(&found->hidden_list)) {
722 const struct cfg80211_bss_ies *f;
723
724
725
726
727
728
729
730
731
732
733
734 f = rcu_access_pointer(tmp->pub.beacon_ies);
735 kfree_rcu((struct cfg80211_bss_ies *)f,
736 rcu_head);
737 goto drop;
738 }
739
740 old = rcu_access_pointer(found->pub.beacon_ies);
741
742 rcu_assign_pointer(found->pub.beacon_ies,
743 tmp->pub.beacon_ies);
744
745
746 if (old == rcu_access_pointer(found->pub.ies))
747 rcu_assign_pointer(found->pub.ies,
748 tmp->pub.beacon_ies);
749
750
751 list_for_each_entry(bss, &found->hidden_list,
752 hidden_list) {
753 const struct cfg80211_bss_ies *ies;
754
755 ies = rcu_access_pointer(bss->pub.beacon_ies);
756 WARN_ON(ies != old);
757
758 rcu_assign_pointer(bss->pub.beacon_ies,
759 tmp->pub.beacon_ies);
760 }
761
762 if (old)
763 kfree_rcu((struct cfg80211_bss_ies *)old,
764 rcu_head);
765 }
766
767 found->pub.beacon_interval = tmp->pub.beacon_interval;
768 found->pub.signal = tmp->pub.signal;
769 found->pub.capability = tmp->pub.capability;
770 found->ts = tmp->ts;
771 } else {
772 struct cfg80211_internal_bss *new;
773 struct cfg80211_internal_bss *hidden;
774 struct cfg80211_bss_ies *ies;
775
776
777
778
779
780
781 new = kzalloc(sizeof(*new) + dev->wiphy.bss_priv_size,
782 GFP_ATOMIC);
783 if (!new) {
784 ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
785 if (ies)
786 kfree_rcu(ies, rcu_head);
787 ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
788 if (ies)
789 kfree_rcu(ies, rcu_head);
790 goto drop;
791 }
792 memcpy(new, tmp, sizeof(*new));
793 new->refcount = 1;
794 INIT_LIST_HEAD(&new->hidden_list);
795
796 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
797 hidden = rb_find_bss(dev, tmp, BSS_CMP_HIDE_ZLEN);
798 if (!hidden)
799 hidden = rb_find_bss(dev, tmp,
800 BSS_CMP_HIDE_NUL);
801 if (hidden) {
802 new->pub.hidden_beacon_bss = &hidden->pub;
803 list_add(&new->hidden_list,
804 &hidden->hidden_list);
805 hidden->refcount++;
806 rcu_assign_pointer(new->pub.beacon_ies,
807 hidden->pub.beacon_ies);
808 }
809 } else {
810
811
812
813
814
815
816 if (!cfg80211_combine_bsses(dev, new)) {
817 kfree(new);
818 goto drop;
819 }
820 }
821
822 list_add_tail(&new->list, &dev->bss_list);
823 rb_insert_bss(dev, new);
824 found = new;
825 }
826
827 dev->bss_generation++;
828 bss_ref_get(dev, found);
829 spin_unlock_bh(&dev->bss_lock);
830
831 return found;
832 drop:
833 spin_unlock_bh(&dev->bss_lock);
834 return NULL;
835}
836
837static struct ieee80211_channel *
838cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
839 struct ieee80211_channel *channel)
840{
841 const u8 *tmp;
842 u32 freq;
843 int channel_number = -1;
844
845 tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen);
846 if (tmp && tmp[1] == 1) {
847 channel_number = tmp[2];
848 } else {
849 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen);
850 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) {
851 struct ieee80211_ht_operation *htop = (void *)(tmp + 2);
852
853 channel_number = htop->primary_chan;
854 }
855 }
856
857 if (channel_number < 0)
858 return channel;
859
860 freq = ieee80211_channel_to_frequency(channel_number, channel->band);
861 channel = ieee80211_get_channel(wiphy, freq);
862 if (!channel)
863 return NULL;
864 if (channel->flags & IEEE80211_CHAN_DISABLED)
865 return NULL;
866 return channel;
867}
868
869
870struct cfg80211_bss*
871cfg80211_inform_bss_width(struct wiphy *wiphy,
872 struct ieee80211_channel *channel,
873 enum nl80211_bss_scan_width scan_width,
874 const u8 *bssid, u64 tsf, u16 capability,
875 u16 beacon_interval, const u8 *ie, size_t ielen,
876 s32 signal, gfp_t gfp)
877{
878 struct cfg80211_bss_ies *ies;
879 struct cfg80211_internal_bss tmp = {}, *res;
880
881 if (WARN_ON(!wiphy))
882 return NULL;
883
884 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
885 (signal < 0 || signal > 100)))
886 return NULL;
887
888 channel = cfg80211_get_bss_channel(wiphy, ie, ielen, channel);
889 if (!channel)
890 return NULL;
891
892 memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
893 tmp.pub.channel = channel;
894 tmp.pub.scan_width = scan_width;
895 tmp.pub.signal = signal;
896 tmp.pub.beacon_interval = beacon_interval;
897 tmp.pub.capability = capability;
898
899
900
901
902
903
904
905
906 ies = kmalloc(sizeof(*ies) + ielen, gfp);
907 if (!ies)
908 return NULL;
909 ies->len = ielen;
910 ies->tsf = tsf;
911 memcpy(ies->data, ie, ielen);
912
913 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
914 rcu_assign_pointer(tmp.pub.ies, ies);
915
916 res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp);
917 if (!res)
918 return NULL;
919
920 if (res->pub.capability & WLAN_CAPABILITY_ESS)
921 regulatory_hint_found_beacon(wiphy, channel, gfp);
922
923 trace_cfg80211_return_bss(&res->pub);
924
925 return &res->pub;
926}
927EXPORT_SYMBOL(cfg80211_inform_bss_width);
928
929
930struct cfg80211_bss *
931cfg80211_inform_bss_width_frame(struct wiphy *wiphy,
932 struct ieee80211_channel *channel,
933 enum nl80211_bss_scan_width scan_width,
934 struct ieee80211_mgmt *mgmt, size_t len,
935 s32 signal, gfp_t gfp)
936{
937 struct cfg80211_internal_bss tmp = {}, *res;
938 struct cfg80211_bss_ies *ies;
939 size_t ielen = len - offsetof(struct ieee80211_mgmt,
940 u.probe_resp.variable);
941
942 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
943 offsetof(struct ieee80211_mgmt, u.beacon.variable));
944
945 trace_cfg80211_inform_bss_width_frame(wiphy, channel, scan_width, mgmt,
946 len, signal);
947
948 if (WARN_ON(!mgmt))
949 return NULL;
950
951 if (WARN_ON(!wiphy))
952 return NULL;
953
954 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
955 (signal < 0 || signal > 100)))
956 return NULL;
957
958 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
959 return NULL;
960
961 channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable,
962 ielen, channel);
963 if (!channel)
964 return NULL;
965
966 ies = kmalloc(sizeof(*ies) + ielen, gfp);
967 if (!ies)
968 return NULL;
969 ies->len = ielen;
970 ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
971 memcpy(ies->data, mgmt->u.probe_resp.variable, ielen);
972
973 if (ieee80211_is_probe_resp(mgmt->frame_control))
974 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
975 else
976 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
977 rcu_assign_pointer(tmp.pub.ies, ies);
978
979 memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN);
980 tmp.pub.channel = channel;
981 tmp.pub.scan_width = scan_width;
982 tmp.pub.signal = signal;
983 tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
984 tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
985
986 res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp);
987 if (!res)
988 return NULL;
989
990 if (res->pub.capability & WLAN_CAPABILITY_ESS)
991 regulatory_hint_found_beacon(wiphy, channel, gfp);
992
993 trace_cfg80211_return_bss(&res->pub);
994
995 return &res->pub;
996}
997EXPORT_SYMBOL(cfg80211_inform_bss_width_frame);
998
999void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1000{
1001 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
1002 struct cfg80211_internal_bss *bss;
1003
1004 if (!pub)
1005 return;
1006
1007 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1008
1009 spin_lock_bh(&dev->bss_lock);
1010 bss_ref_get(dev, bss);
1011 spin_unlock_bh(&dev->bss_lock);
1012}
1013EXPORT_SYMBOL(cfg80211_ref_bss);
1014
1015void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1016{
1017 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
1018 struct cfg80211_internal_bss *bss;
1019
1020 if (!pub)
1021 return;
1022
1023 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1024
1025 spin_lock_bh(&dev->bss_lock);
1026 bss_ref_put(dev, bss);
1027 spin_unlock_bh(&dev->bss_lock);
1028}
1029EXPORT_SYMBOL(cfg80211_put_bss);
1030
1031void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1032{
1033 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
1034 struct cfg80211_internal_bss *bss;
1035
1036 if (WARN_ON(!pub))
1037 return;
1038
1039 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1040
1041 spin_lock_bh(&dev->bss_lock);
1042 if (!list_empty(&bss->list)) {
1043 if (__cfg80211_unlink_bss(dev, bss))
1044 dev->bss_generation++;
1045 }
1046 spin_unlock_bh(&dev->bss_lock);
1047}
1048EXPORT_SYMBOL(cfg80211_unlink_bss);
1049
1050#ifdef CONFIG_CFG80211_WEXT
1051static struct cfg80211_registered_device *
1052cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
1053{
1054 struct cfg80211_registered_device *rdev;
1055 struct net_device *dev;
1056
1057 ASSERT_RTNL();
1058
1059 dev = dev_get_by_index(net, ifindex);
1060 if (!dev)
1061 return ERR_PTR(-ENODEV);
1062 if (dev->ieee80211_ptr)
1063 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
1064 else
1065 rdev = ERR_PTR(-ENODEV);
1066 dev_put(dev);
1067 return rdev;
1068}
1069
1070int cfg80211_wext_siwscan(struct net_device *dev,
1071 struct iw_request_info *info,
1072 union iwreq_data *wrqu, char *extra)
1073{
1074 struct cfg80211_registered_device *rdev;
1075 struct wiphy *wiphy;
1076 struct iw_scan_req *wreq = NULL;
1077 struct cfg80211_scan_request *creq = NULL;
1078 int i, err, n_channels = 0;
1079 enum ieee80211_band band;
1080
1081 if (!netif_running(dev))
1082 return -ENETDOWN;
1083
1084 if (wrqu->data.length == sizeof(struct iw_scan_req))
1085 wreq = (struct iw_scan_req *)extra;
1086
1087 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1088
1089 if (IS_ERR(rdev))
1090 return PTR_ERR(rdev);
1091
1092 if (rdev->scan_req || rdev->scan_msg) {
1093 err = -EBUSY;
1094 goto out;
1095 }
1096
1097 wiphy = &rdev->wiphy;
1098
1099
1100 if (wreq && wreq->num_channels)
1101 n_channels = wreq->num_channels;
1102 else
1103 n_channels = ieee80211_get_num_supported_channels(wiphy);
1104
1105 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
1106 n_channels * sizeof(void *),
1107 GFP_ATOMIC);
1108 if (!creq) {
1109 err = -ENOMEM;
1110 goto out;
1111 }
1112
1113 creq->wiphy = wiphy;
1114 creq->wdev = dev->ieee80211_ptr;
1115
1116 creq->ssids = (void *)&creq->channels[n_channels];
1117 creq->n_channels = n_channels;
1118 creq->n_ssids = 1;
1119 creq->scan_start = jiffies;
1120
1121
1122 i = 0;
1123 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1124 int j;
1125
1126 if (!wiphy->bands[band])
1127 continue;
1128
1129 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
1130
1131 if (wiphy->bands[band]->channels[j].flags &
1132 IEEE80211_CHAN_DISABLED)
1133 continue;
1134
1135
1136
1137
1138
1139 if (wreq && wreq->num_channels) {
1140 int k;
1141 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
1142 for (k = 0; k < wreq->num_channels; k++) {
1143 int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]);
1144 if (wext_freq == wiphy_freq)
1145 goto wext_freq_found;
1146 }
1147 goto wext_freq_not_found;
1148 }
1149
1150 wext_freq_found:
1151 creq->channels[i] = &wiphy->bands[band]->channels[j];
1152 i++;
1153 wext_freq_not_found: ;
1154 }
1155 }
1156
1157 if (!i) {
1158 err = -EINVAL;
1159 goto out;
1160 }
1161
1162
1163 creq->n_channels = i;
1164
1165
1166 if (wreq) {
1167 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
1168 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
1169 err = -EINVAL;
1170 goto out;
1171 }
1172 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
1173 creq->ssids[0].ssid_len = wreq->essid_len;
1174 }
1175 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
1176 creq->n_ssids = 0;
1177 }
1178
1179 for (i = 0; i < IEEE80211_NUM_BANDS; i++)
1180 if (wiphy->bands[i])
1181 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
1182
1183 rdev->scan_req = creq;
1184 err = rdev_scan(rdev, creq);
1185 if (err) {
1186 rdev->scan_req = NULL;
1187
1188 } else {
1189 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
1190
1191 creq = NULL;
1192 dev_hold(dev);
1193 }
1194 out:
1195 kfree(creq);
1196 return err;
1197}
1198EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
1199
1200static void ieee80211_scan_add_ies(struct iw_request_info *info,
1201 const struct cfg80211_bss_ies *ies,
1202 char **current_ev, char *end_buf)
1203{
1204 const u8 *pos, *end, *next;
1205 struct iw_event iwe;
1206
1207 if (!ies)
1208 return;
1209
1210
1211
1212
1213
1214 pos = ies->data;
1215 end = pos + ies->len;
1216
1217 while (end - pos > IW_GENERIC_IE_MAX) {
1218 next = pos + 2 + pos[1];
1219 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
1220 next = next + 2 + next[1];
1221
1222 memset(&iwe, 0, sizeof(iwe));
1223 iwe.cmd = IWEVGENIE;
1224 iwe.u.data.length = next - pos;
1225 *current_ev = iwe_stream_add_point(info, *current_ev,
1226 end_buf, &iwe,
1227 (void *)pos);
1228
1229 pos = next;
1230 }
1231
1232 if (end > pos) {
1233 memset(&iwe, 0, sizeof(iwe));
1234 iwe.cmd = IWEVGENIE;
1235 iwe.u.data.length = end - pos;
1236 *current_ev = iwe_stream_add_point(info, *current_ev,
1237 end_buf, &iwe,
1238 (void *)pos);
1239 }
1240}
1241
1242static char *
1243ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
1244 struct cfg80211_internal_bss *bss, char *current_ev,
1245 char *end_buf)
1246{
1247 const struct cfg80211_bss_ies *ies;
1248 struct iw_event iwe;
1249 const u8 *ie;
1250 u8 *buf, *cfg, *p;
1251 int rem, i, sig;
1252 bool ismesh = false;
1253
1254 memset(&iwe, 0, sizeof(iwe));
1255 iwe.cmd = SIOCGIWAP;
1256 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1257 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
1258 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1259 IW_EV_ADDR_LEN);
1260
1261 memset(&iwe, 0, sizeof(iwe));
1262 iwe.cmd = SIOCGIWFREQ;
1263 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
1264 iwe.u.freq.e = 0;
1265 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1266 IW_EV_FREQ_LEN);
1267
1268 memset(&iwe, 0, sizeof(iwe));
1269 iwe.cmd = SIOCGIWFREQ;
1270 iwe.u.freq.m = bss->pub.channel->center_freq;
1271 iwe.u.freq.e = 6;
1272 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1273 IW_EV_FREQ_LEN);
1274
1275 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
1276 memset(&iwe, 0, sizeof(iwe));
1277 iwe.cmd = IWEVQUAL;
1278 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
1279 IW_QUAL_NOISE_INVALID |
1280 IW_QUAL_QUAL_UPDATED;
1281 switch (wiphy->signal_type) {
1282 case CFG80211_SIGNAL_TYPE_MBM:
1283 sig = bss->pub.signal / 100;
1284 iwe.u.qual.level = sig;
1285 iwe.u.qual.updated |= IW_QUAL_DBM;
1286 if (sig < -110)
1287 sig = -110;
1288 else if (sig > -40)
1289 sig = -40;
1290
1291 iwe.u.qual.qual = sig + 110;
1292 break;
1293 case CFG80211_SIGNAL_TYPE_UNSPEC:
1294 iwe.u.qual.level = bss->pub.signal;
1295
1296 iwe.u.qual.qual = bss->pub.signal;
1297 break;
1298 default:
1299
1300 break;
1301 }
1302 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1303 &iwe, IW_EV_QUAL_LEN);
1304 }
1305
1306 memset(&iwe, 0, sizeof(iwe));
1307 iwe.cmd = SIOCGIWENCODE;
1308 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
1309 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1310 else
1311 iwe.u.data.flags = IW_ENCODE_DISABLED;
1312 iwe.u.data.length = 0;
1313 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1314 &iwe, "");
1315
1316 rcu_read_lock();
1317 ies = rcu_dereference(bss->pub.ies);
1318 rem = ies->len;
1319 ie = ies->data;
1320
1321 while (rem >= 2) {
1322
1323 if (ie[1] > rem - 2)
1324 break;
1325
1326 switch (ie[0]) {
1327 case WLAN_EID_SSID:
1328 memset(&iwe, 0, sizeof(iwe));
1329 iwe.cmd = SIOCGIWESSID;
1330 iwe.u.data.length = ie[1];
1331 iwe.u.data.flags = 1;
1332 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1333 &iwe, (u8 *)ie + 2);
1334 break;
1335 case WLAN_EID_MESH_ID:
1336 memset(&iwe, 0, sizeof(iwe));
1337 iwe.cmd = SIOCGIWESSID;
1338 iwe.u.data.length = ie[1];
1339 iwe.u.data.flags = 1;
1340 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1341 &iwe, (u8 *)ie + 2);
1342 break;
1343 case WLAN_EID_MESH_CONFIG:
1344 ismesh = true;
1345 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
1346 break;
1347 buf = kmalloc(50, GFP_ATOMIC);
1348 if (!buf)
1349 break;
1350 cfg = (u8 *)ie + 2;
1351 memset(&iwe, 0, sizeof(iwe));
1352 iwe.cmd = IWEVCUSTOM;
1353 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
1354 "0x%02X", cfg[0]);
1355 iwe.u.data.length = strlen(buf);
1356 current_ev = iwe_stream_add_point(info, current_ev,
1357 end_buf,
1358 &iwe, buf);
1359 sprintf(buf, "Path Selection Metric ID: 0x%02X",
1360 cfg[1]);
1361 iwe.u.data.length = strlen(buf);
1362 current_ev = iwe_stream_add_point(info, current_ev,
1363 end_buf,
1364 &iwe, buf);
1365 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
1366 cfg[2]);
1367 iwe.u.data.length = strlen(buf);
1368 current_ev = iwe_stream_add_point(info, current_ev,
1369 end_buf,
1370 &iwe, buf);
1371 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
1372 iwe.u.data.length = strlen(buf);
1373 current_ev = iwe_stream_add_point(info, current_ev,
1374 end_buf,
1375 &iwe, buf);
1376 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
1377 iwe.u.data.length = strlen(buf);
1378 current_ev = iwe_stream_add_point(info, current_ev,
1379 end_buf,
1380 &iwe, buf);
1381 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
1382 iwe.u.data.length = strlen(buf);
1383 current_ev = iwe_stream_add_point(info, current_ev,
1384 end_buf,
1385 &iwe, buf);
1386 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
1387 iwe.u.data.length = strlen(buf);
1388 current_ev = iwe_stream_add_point(info, current_ev,
1389 end_buf,
1390 &iwe, buf);
1391 kfree(buf);
1392 break;
1393 case WLAN_EID_SUPP_RATES:
1394 case WLAN_EID_EXT_SUPP_RATES:
1395
1396 p = current_ev + iwe_stream_lcp_len(info);
1397
1398 memset(&iwe, 0, sizeof(iwe));
1399 iwe.cmd = SIOCGIWRATE;
1400
1401 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
1402
1403 for (i = 0; i < ie[1]; i++) {
1404 iwe.u.bitrate.value =
1405 ((ie[i + 2] & 0x7f) * 500000);
1406 p = iwe_stream_add_value(info, current_ev, p,
1407 end_buf, &iwe, IW_EV_PARAM_LEN);
1408 }
1409 current_ev = p;
1410 break;
1411 }
1412 rem -= ie[1] + 2;
1413 ie += ie[1] + 2;
1414 }
1415
1416 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
1417 ismesh) {
1418 memset(&iwe, 0, sizeof(iwe));
1419 iwe.cmd = SIOCGIWMODE;
1420 if (ismesh)
1421 iwe.u.mode = IW_MODE_MESH;
1422 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
1423 iwe.u.mode = IW_MODE_MASTER;
1424 else
1425 iwe.u.mode = IW_MODE_ADHOC;
1426 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1427 &iwe, IW_EV_UINT_LEN);
1428 }
1429
1430 buf = kmalloc(31, GFP_ATOMIC);
1431 if (buf) {
1432 memset(&iwe, 0, sizeof(iwe));
1433 iwe.cmd = IWEVCUSTOM;
1434 sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
1435 iwe.u.data.length = strlen(buf);
1436 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1437 &iwe, buf);
1438 memset(&iwe, 0, sizeof(iwe));
1439 iwe.cmd = IWEVCUSTOM;
1440 sprintf(buf, " Last beacon: %ums ago",
1441 elapsed_jiffies_msecs(bss->ts));
1442 iwe.u.data.length = strlen(buf);
1443 current_ev = iwe_stream_add_point(info, current_ev,
1444 end_buf, &iwe, buf);
1445 kfree(buf);
1446 }
1447
1448 ieee80211_scan_add_ies(info, ies, ¤t_ev, end_buf);
1449 rcu_read_unlock();
1450
1451 return current_ev;
1452}
1453
1454
1455static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
1456 struct iw_request_info *info,
1457 char *buf, size_t len)
1458{
1459 char *current_ev = buf;
1460 char *end_buf = buf + len;
1461 struct cfg80211_internal_bss *bss;
1462
1463 spin_lock_bh(&dev->bss_lock);
1464 cfg80211_bss_expire(dev);
1465
1466 list_for_each_entry(bss, &dev->bss_list, list) {
1467 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
1468 spin_unlock_bh(&dev->bss_lock);
1469 return -E2BIG;
1470 }
1471 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
1472 current_ev, end_buf);
1473 }
1474 spin_unlock_bh(&dev->bss_lock);
1475 return current_ev - buf;
1476}
1477
1478
1479int cfg80211_wext_giwscan(struct net_device *dev,
1480 struct iw_request_info *info,
1481 struct iw_point *data, char *extra)
1482{
1483 struct cfg80211_registered_device *rdev;
1484 int res;
1485
1486 if (!netif_running(dev))
1487 return -ENETDOWN;
1488
1489 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1490
1491 if (IS_ERR(rdev))
1492 return PTR_ERR(rdev);
1493
1494 if (rdev->scan_req || rdev->scan_msg)
1495 return -EAGAIN;
1496
1497 res = ieee80211_scan_results(rdev, info, extra, data->length);
1498 data->length = 0;
1499 if (res >= 0) {
1500 data->length = res;
1501 res = 0;
1502 }
1503
1504 return res;
1505}
1506EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);
1507#endif
1508