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10#include <linux/kernel.h>
11#include <linux/slab.h>
12#include <linux/module.h>
13#include <linux/netdevice.h>
14#include <linux/wireless.h>
15#include <linux/nl80211.h>
16#include <linux/etherdevice.h>
17#include <net/arp.h>
18#include <net/cfg80211.h>
19#include <net/cfg80211-wext.h>
20#include <net/iw_handler.h>
21#include "core.h"
22#include "nl80211.h"
23#include "wext-compat.h"
24#include "rdev-ops.h"
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70static int bss_entries_limit = 1000;
71module_param(bss_entries_limit, int, 0644);
72MODULE_PARM_DESC(bss_entries_limit,
73 "limit to number of scan BSS entries (per wiphy, default 1000)");
74
75#define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ)
76
77static void bss_free(struct cfg80211_internal_bss *bss)
78{
79 struct cfg80211_bss_ies *ies;
80
81 if (WARN_ON(atomic_read(&bss->hold)))
82 return;
83
84 ies = (void *)rcu_access_pointer(bss->pub.beacon_ies);
85 if (ies && !bss->pub.hidden_beacon_bss)
86 kfree_rcu(ies, rcu_head);
87 ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies);
88 if (ies)
89 kfree_rcu(ies, rcu_head);
90
91
92
93
94
95 if (!list_empty(&bss->hidden_list))
96 list_del(&bss->hidden_list);
97
98 kfree(bss);
99}
100
101static inline void bss_ref_get(struct cfg80211_registered_device *rdev,
102 struct cfg80211_internal_bss *bss)
103{
104 lockdep_assert_held(&rdev->bss_lock);
105
106 bss->refcount++;
107 if (bss->pub.hidden_beacon_bss) {
108 bss = container_of(bss->pub.hidden_beacon_bss,
109 struct cfg80211_internal_bss,
110 pub);
111 bss->refcount++;
112 }
113 if (bss->pub.transmitted_bss) {
114 bss = container_of(bss->pub.transmitted_bss,
115 struct cfg80211_internal_bss,
116 pub);
117 bss->refcount++;
118 }
119}
120
121static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
122 struct cfg80211_internal_bss *bss)
123{
124 lockdep_assert_held(&rdev->bss_lock);
125
126 if (bss->pub.hidden_beacon_bss) {
127 struct cfg80211_internal_bss *hbss;
128 hbss = container_of(bss->pub.hidden_beacon_bss,
129 struct cfg80211_internal_bss,
130 pub);
131 hbss->refcount--;
132 if (hbss->refcount == 0)
133 bss_free(hbss);
134 }
135
136 if (bss->pub.transmitted_bss) {
137 struct cfg80211_internal_bss *tbss;
138
139 tbss = container_of(bss->pub.transmitted_bss,
140 struct cfg80211_internal_bss,
141 pub);
142 tbss->refcount--;
143 if (tbss->refcount == 0)
144 bss_free(tbss);
145 }
146
147 bss->refcount--;
148 if (bss->refcount == 0)
149 bss_free(bss);
150}
151
152static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev,
153 struct cfg80211_internal_bss *bss)
154{
155 lockdep_assert_held(&rdev->bss_lock);
156
157 if (!list_empty(&bss->hidden_list)) {
158
159
160
161
162 if (!bss->pub.hidden_beacon_bss)
163 return false;
164
165
166
167
168 list_del_init(&bss->hidden_list);
169 }
170
171 list_del_init(&bss->list);
172 list_del_init(&bss->pub.nontrans_list);
173 rb_erase(&bss->rbn, &rdev->bss_tree);
174 rdev->bss_entries--;
175 WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list),
176 "rdev bss entries[%d]/list[empty:%d] corruption\n",
177 rdev->bss_entries, list_empty(&rdev->bss_list));
178 bss_ref_put(rdev, bss);
179 return true;
180}
181
182bool cfg80211_is_element_inherited(const struct element *elem,
183 const struct element *non_inherit_elem)
184{
185 u8 id_len, ext_id_len, i, loop_len, id;
186 const u8 *list;
187
188 if (elem->id == WLAN_EID_MULTIPLE_BSSID)
189 return false;
190
191 if (!non_inherit_elem || non_inherit_elem->datalen < 2)
192 return true;
193
194
195
196
197
198
199
200
201 id_len = non_inherit_elem->data[1];
202 if (non_inherit_elem->datalen < 3 + id_len)
203 return true;
204
205 ext_id_len = non_inherit_elem->data[2 + id_len];
206 if (non_inherit_elem->datalen < 3 + id_len + ext_id_len)
207 return true;
208
209 if (elem->id == WLAN_EID_EXTENSION) {
210 if (!ext_id_len)
211 return true;
212 loop_len = ext_id_len;
213 list = &non_inherit_elem->data[3 + id_len];
214 id = elem->data[0];
215 } else {
216 if (!id_len)
217 return true;
218 loop_len = id_len;
219 list = &non_inherit_elem->data[2];
220 id = elem->id;
221 }
222
223 for (i = 0; i < loop_len; i++) {
224 if (list[i] == id)
225 return false;
226 }
227
228 return true;
229}
230EXPORT_SYMBOL(cfg80211_is_element_inherited);
231
232static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen,
233 const u8 *subelement, size_t subie_len,
234 u8 *new_ie, gfp_t gfp)
235{
236 u8 *pos, *tmp;
237 const u8 *tmp_old, *tmp_new;
238 const struct element *non_inherit_elem;
239 u8 *sub_copy;
240
241
242
243
244 sub_copy = kmemdup(subelement, subie_len, gfp);
245 if (!sub_copy)
246 return 0;
247
248 pos = &new_ie[0];
249
250
251 tmp_new = cfg80211_find_ie(WLAN_EID_SSID, sub_copy, subie_len);
252 if (tmp_new) {
253 memcpy(pos, tmp_new, tmp_new[1] + 2);
254 pos += (tmp_new[1] + 2);
255 }
256
257
258 non_inherit_elem =
259 cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE,
260 sub_copy, subie_len);
261
262
263
264
265 tmp_old = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
266 tmp_old = (tmp_old) ? tmp_old + tmp_old[1] + 2 : ie;
267
268 while (tmp_old + tmp_old[1] + 2 - ie <= ielen) {
269 if (tmp_old[0] == 0) {
270 tmp_old++;
271 continue;
272 }
273
274 if (tmp_old[0] == WLAN_EID_EXTENSION)
275 tmp = (u8 *)cfg80211_find_ext_ie(tmp_old[2], sub_copy,
276 subie_len);
277 else
278 tmp = (u8 *)cfg80211_find_ie(tmp_old[0], sub_copy,
279 subie_len);
280
281 if (!tmp) {
282 const struct element *old_elem = (void *)tmp_old;
283
284
285 if (cfg80211_is_element_inherited(old_elem,
286 non_inherit_elem)) {
287 memcpy(pos, tmp_old, tmp_old[1] + 2);
288 pos += tmp_old[1] + 2;
289 }
290 } else {
291
292
293
294
295
296
297
298 if (tmp_old[0] == WLAN_EID_VENDOR_SPECIFIC) {
299 if (!memcmp(tmp_old + 2, tmp + 2, 5)) {
300
301
302
303 memcpy(pos, tmp, tmp[1] + 2);
304 pos += tmp[1] + 2;
305 tmp[0] = WLAN_EID_SSID;
306 } else {
307 memcpy(pos, tmp_old, tmp_old[1] + 2);
308 pos += tmp_old[1] + 2;
309 }
310 } else {
311
312 memcpy(pos, tmp, tmp[1] + 2);
313 pos += tmp[1] + 2;
314 tmp[0] = WLAN_EID_SSID;
315 }
316 }
317
318 if (tmp_old + tmp_old[1] + 2 - ie == ielen)
319 break;
320
321 tmp_old += tmp_old[1] + 2;
322 }
323
324
325
326
327 tmp_new = sub_copy;
328 while (tmp_new + tmp_new[1] + 2 - sub_copy <= subie_len) {
329 if (!(tmp_new[0] == WLAN_EID_NON_TX_BSSID_CAP ||
330 tmp_new[0] == WLAN_EID_SSID)) {
331 memcpy(pos, tmp_new, tmp_new[1] + 2);
332 pos += tmp_new[1] + 2;
333 }
334 if (tmp_new + tmp_new[1] + 2 - sub_copy == subie_len)
335 break;
336 tmp_new += tmp_new[1] + 2;
337 }
338
339 kfree(sub_copy);
340 return pos - new_ie;
341}
342
343static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
344 const u8 *ssid, size_t ssid_len)
345{
346 const struct cfg80211_bss_ies *ies;
347 const u8 *ssidie;
348
349 if (bssid && !ether_addr_equal(a->bssid, bssid))
350 return false;
351
352 if (!ssid)
353 return true;
354
355 ies = rcu_access_pointer(a->ies);
356 if (!ies)
357 return false;
358 ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
359 if (!ssidie)
360 return false;
361 if (ssidie[1] != ssid_len)
362 return false;
363 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
364}
365
366static int
367cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss,
368 struct cfg80211_bss *nontrans_bss)
369{
370 const u8 *ssid;
371 size_t ssid_len;
372 struct cfg80211_bss *bss = NULL;
373
374 rcu_read_lock();
375 ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
376 if (!ssid) {
377 rcu_read_unlock();
378 return -EINVAL;
379 }
380 ssid_len = ssid[1];
381 ssid = ssid + 2;
382 rcu_read_unlock();
383
384
385 list_for_each_entry(bss, &trans_bss->nontrans_list, nontrans_list) {
386 if (is_bss(bss, nontrans_bss->bssid, ssid, ssid_len))
387 return 0;
388 }
389
390
391 list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list);
392 return 0;
393}
394
395static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev,
396 unsigned long expire_time)
397{
398 struct cfg80211_internal_bss *bss, *tmp;
399 bool expired = false;
400
401 lockdep_assert_held(&rdev->bss_lock);
402
403 list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) {
404 if (atomic_read(&bss->hold))
405 continue;
406 if (!time_after(expire_time, bss->ts))
407 continue;
408
409 if (__cfg80211_unlink_bss(rdev, bss))
410 expired = true;
411 }
412
413 if (expired)
414 rdev->bss_generation++;
415}
416
417static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev)
418{
419 struct cfg80211_internal_bss *bss, *oldest = NULL;
420 bool ret;
421
422 lockdep_assert_held(&rdev->bss_lock);
423
424 list_for_each_entry(bss, &rdev->bss_list, list) {
425 if (atomic_read(&bss->hold))
426 continue;
427
428 if (!list_empty(&bss->hidden_list) &&
429 !bss->pub.hidden_beacon_bss)
430 continue;
431
432 if (oldest && time_before(oldest->ts, bss->ts))
433 continue;
434 oldest = bss;
435 }
436
437 if (WARN_ON(!oldest))
438 return false;
439
440
441
442
443
444
445
446 ret = __cfg80211_unlink_bss(rdev, oldest);
447 WARN_ON(!ret);
448 return ret;
449}
450
451void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
452 bool send_message)
453{
454 struct cfg80211_scan_request *request;
455 struct wireless_dev *wdev;
456 struct sk_buff *msg;
457#ifdef CONFIG_CFG80211_WEXT
458 union iwreq_data wrqu;
459#endif
460
461 ASSERT_RTNL();
462
463 if (rdev->scan_msg) {
464 nl80211_send_scan_msg(rdev, rdev->scan_msg);
465 rdev->scan_msg = NULL;
466 return;
467 }
468
469 request = rdev->scan_req;
470 if (!request)
471 return;
472
473 wdev = request->wdev;
474
475
476
477
478
479
480 if (wdev->netdev)
481 cfg80211_sme_scan_done(wdev->netdev);
482
483 if (!request->info.aborted &&
484 request->flags & NL80211_SCAN_FLAG_FLUSH) {
485
486 spin_lock_bh(&rdev->bss_lock);
487 __cfg80211_bss_expire(rdev, request->scan_start);
488 spin_unlock_bh(&rdev->bss_lock);
489 }
490
491 msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted);
492
493#ifdef CONFIG_CFG80211_WEXT
494 if (wdev->netdev && !request->info.aborted) {
495 memset(&wrqu, 0, sizeof(wrqu));
496
497 wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
498 }
499#endif
500
501 if (wdev->netdev)
502 dev_put(wdev->netdev);
503
504 rdev->scan_req = NULL;
505 kfree(request);
506
507 if (!send_message)
508 rdev->scan_msg = msg;
509 else
510 nl80211_send_scan_msg(rdev, msg);
511}
512
513void __cfg80211_scan_done(struct work_struct *wk)
514{
515 struct cfg80211_registered_device *rdev;
516
517 rdev = container_of(wk, struct cfg80211_registered_device,
518 scan_done_wk);
519
520 rtnl_lock();
521 ___cfg80211_scan_done(rdev, true);
522 rtnl_unlock();
523}
524
525void cfg80211_scan_done(struct cfg80211_scan_request *request,
526 struct cfg80211_scan_info *info)
527{
528 trace_cfg80211_scan_done(request, info);
529 WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req);
530
531 request->info = *info;
532 request->notified = true;
533 queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk);
534}
535EXPORT_SYMBOL(cfg80211_scan_done);
536
537void cfg80211_add_sched_scan_req(struct cfg80211_registered_device *rdev,
538 struct cfg80211_sched_scan_request *req)
539{
540 ASSERT_RTNL();
541
542 list_add_rcu(&req->list, &rdev->sched_scan_req_list);
543}
544
545static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device *rdev,
546 struct cfg80211_sched_scan_request *req)
547{
548 ASSERT_RTNL();
549
550 list_del_rcu(&req->list);
551 kfree_rcu(req, rcu_head);
552}
553
554static struct cfg80211_sched_scan_request *
555cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid)
556{
557 struct cfg80211_sched_scan_request *pos;
558
559 WARN_ON_ONCE(!rcu_read_lock_held() && !lockdep_rtnl_is_held());
560
561 list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list) {
562 if (pos->reqid == reqid)
563 return pos;
564 }
565 return NULL;
566}
567
568
569
570
571
572
573
574
575
576int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev,
577 bool want_multi)
578{
579 struct cfg80211_sched_scan_request *pos;
580 int i = 0;
581
582 list_for_each_entry(pos, &rdev->sched_scan_req_list, list) {
583
584 if (!i && !pos->reqid)
585 return -EINPROGRESS;
586 i++;
587 }
588
589 if (i) {
590
591 if (!want_multi)
592 return -EINPROGRESS;
593
594
595 if (i == rdev->wiphy.max_sched_scan_reqs)
596 return -ENOSPC;
597 }
598 return 0;
599}
600
601void cfg80211_sched_scan_results_wk(struct work_struct *work)
602{
603 struct cfg80211_registered_device *rdev;
604 struct cfg80211_sched_scan_request *req, *tmp;
605
606 rdev = container_of(work, struct cfg80211_registered_device,
607 sched_scan_res_wk);
608
609 rtnl_lock();
610 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
611 if (req->report_results) {
612 req->report_results = false;
613 if (req->flags & NL80211_SCAN_FLAG_FLUSH) {
614
615 spin_lock_bh(&rdev->bss_lock);
616 __cfg80211_bss_expire(rdev, req->scan_start);
617 spin_unlock_bh(&rdev->bss_lock);
618 req->scan_start = jiffies;
619 }
620 nl80211_send_sched_scan(req,
621 NL80211_CMD_SCHED_SCAN_RESULTS);
622 }
623 }
624 rtnl_unlock();
625}
626
627void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid)
628{
629 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
630 struct cfg80211_sched_scan_request *request;
631
632 trace_cfg80211_sched_scan_results(wiphy, reqid);
633
634
635 rcu_read_lock();
636 request = cfg80211_find_sched_scan_req(rdev, reqid);
637 if (request) {
638 request->report_results = true;
639 queue_work(cfg80211_wq, &rdev->sched_scan_res_wk);
640 }
641 rcu_read_unlock();
642}
643EXPORT_SYMBOL(cfg80211_sched_scan_results);
644
645void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy, u64 reqid)
646{
647 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
648
649 ASSERT_RTNL();
650
651 trace_cfg80211_sched_scan_stopped(wiphy, reqid);
652
653 __cfg80211_stop_sched_scan(rdev, reqid, true);
654}
655EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl);
656
657void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid)
658{
659 rtnl_lock();
660 cfg80211_sched_scan_stopped_rtnl(wiphy, reqid);
661 rtnl_unlock();
662}
663EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
664
665int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev,
666 struct cfg80211_sched_scan_request *req,
667 bool driver_initiated)
668{
669 ASSERT_RTNL();
670
671 if (!driver_initiated) {
672 int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid);
673 if (err)
674 return err;
675 }
676
677 nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED);
678
679 cfg80211_del_sched_scan_req(rdev, req);
680
681 return 0;
682}
683
684int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
685 u64 reqid, bool driver_initiated)
686{
687 struct cfg80211_sched_scan_request *sched_scan_req;
688
689 ASSERT_RTNL();
690
691 sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid);
692 if (!sched_scan_req)
693 return -ENOENT;
694
695 return cfg80211_stop_sched_scan_req(rdev, sched_scan_req,
696 driver_initiated);
697}
698
699void cfg80211_bss_age(struct cfg80211_registered_device *rdev,
700 unsigned long age_secs)
701{
702 struct cfg80211_internal_bss *bss;
703 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
704
705 spin_lock_bh(&rdev->bss_lock);
706 list_for_each_entry(bss, &rdev->bss_list, list)
707 bss->ts -= age_jiffies;
708 spin_unlock_bh(&rdev->bss_lock);
709}
710
711void cfg80211_bss_expire(struct cfg80211_registered_device *rdev)
712{
713 __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
714}
715
716const struct element *
717cfg80211_find_elem_match(u8 eid, const u8 *ies, unsigned int len,
718 const u8 *match, unsigned int match_len,
719 unsigned int match_offset)
720{
721 const struct element *elem;
722
723 for_each_element_id(elem, eid, ies, len) {
724 if (elem->datalen >= match_offset + match_len &&
725 !memcmp(elem->data + match_offset, match, match_len))
726 return elem;
727 }
728
729 return NULL;
730}
731EXPORT_SYMBOL(cfg80211_find_elem_match);
732
733const struct element *cfg80211_find_vendor_elem(unsigned int oui, int oui_type,
734 const u8 *ies,
735 unsigned int len)
736{
737 const struct element *elem;
738 u8 match[] = { oui >> 16, oui >> 8, oui, oui_type };
739 int match_len = (oui_type < 0) ? 3 : sizeof(match);
740
741 if (WARN_ON(oui_type > 0xff))
742 return NULL;
743
744 elem = cfg80211_find_elem_match(WLAN_EID_VENDOR_SPECIFIC, ies, len,
745 match, match_len, 0);
746
747 if (!elem || elem->datalen < 4)
748 return NULL;
749
750 return elem;
751}
752EXPORT_SYMBOL(cfg80211_find_vendor_elem);
753
754
755
756
757
758
759
760enum bss_compare_mode {
761 BSS_CMP_REGULAR,
762 BSS_CMP_HIDE_ZLEN,
763 BSS_CMP_HIDE_NUL,
764};
765
766static int cmp_bss(struct cfg80211_bss *a,
767 struct cfg80211_bss *b,
768 enum bss_compare_mode mode)
769{
770 const struct cfg80211_bss_ies *a_ies, *b_ies;
771 const u8 *ie1 = NULL;
772 const u8 *ie2 = NULL;
773 int i, r;
774
775 if (a->channel != b->channel)
776 return b->channel->center_freq - a->channel->center_freq;
777
778 a_ies = rcu_access_pointer(a->ies);
779 if (!a_ies)
780 return -1;
781 b_ies = rcu_access_pointer(b->ies);
782 if (!b_ies)
783 return 1;
784
785 if (WLAN_CAPABILITY_IS_STA_BSS(a->capability))
786 ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID,
787 a_ies->data, a_ies->len);
788 if (WLAN_CAPABILITY_IS_STA_BSS(b->capability))
789 ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID,
790 b_ies->data, b_ies->len);
791 if (ie1 && ie2) {
792 int mesh_id_cmp;
793
794 if (ie1[1] == ie2[1])
795 mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]);
796 else
797 mesh_id_cmp = ie2[1] - ie1[1];
798
799 ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
800 a_ies->data, a_ies->len);
801 ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
802 b_ies->data, b_ies->len);
803 if (ie1 && ie2) {
804 if (mesh_id_cmp)
805 return mesh_id_cmp;
806 if (ie1[1] != ie2[1])
807 return ie2[1] - ie1[1];
808 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
809 }
810 }
811
812 r = memcmp(a->bssid, b->bssid, sizeof(a->bssid));
813 if (r)
814 return r;
815
816 ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
817 ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
818
819 if (!ie1 && !ie2)
820 return 0;
821
822
823
824
825
826
827
828
829 if (!ie1)
830 return -1;
831 if (!ie2)
832 return 1;
833
834 switch (mode) {
835 case BSS_CMP_HIDE_ZLEN:
836
837
838
839
840
841
842
843
844
845
846
847
848 return ie2[1];
849 case BSS_CMP_REGULAR:
850 default:
851
852 if (ie1[1] != ie2[1])
853 return ie2[1] - ie1[1];
854 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
855 case BSS_CMP_HIDE_NUL:
856 if (ie1[1] != ie2[1])
857 return ie2[1] - ie1[1];
858
859 for (i = 0; i < ie2[1]; i++)
860 if (ie2[i + 2])
861 return -1;
862 return 0;
863 }
864}
865
866static bool cfg80211_bss_type_match(u16 capability,
867 enum nl80211_band band,
868 enum ieee80211_bss_type bss_type)
869{
870 bool ret = true;
871 u16 mask, val;
872
873 if (bss_type == IEEE80211_BSS_TYPE_ANY)
874 return ret;
875
876 if (band == NL80211_BAND_60GHZ) {
877 mask = WLAN_CAPABILITY_DMG_TYPE_MASK;
878 switch (bss_type) {
879 case IEEE80211_BSS_TYPE_ESS:
880 val = WLAN_CAPABILITY_DMG_TYPE_AP;
881 break;
882 case IEEE80211_BSS_TYPE_PBSS:
883 val = WLAN_CAPABILITY_DMG_TYPE_PBSS;
884 break;
885 case IEEE80211_BSS_TYPE_IBSS:
886 val = WLAN_CAPABILITY_DMG_TYPE_IBSS;
887 break;
888 default:
889 return false;
890 }
891 } else {
892 mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS;
893 switch (bss_type) {
894 case IEEE80211_BSS_TYPE_ESS:
895 val = WLAN_CAPABILITY_ESS;
896 break;
897 case IEEE80211_BSS_TYPE_IBSS:
898 val = WLAN_CAPABILITY_IBSS;
899 break;
900 case IEEE80211_BSS_TYPE_MBSS:
901 val = 0;
902 break;
903 default:
904 return false;
905 }
906 }
907
908 ret = ((capability & mask) == val);
909 return ret;
910}
911
912
913struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
914 struct ieee80211_channel *channel,
915 const u8 *bssid,
916 const u8 *ssid, size_t ssid_len,
917 enum ieee80211_bss_type bss_type,
918 enum ieee80211_privacy privacy)
919{
920 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
921 struct cfg80211_internal_bss *bss, *res = NULL;
922 unsigned long now = jiffies;
923 int bss_privacy;
924
925 trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type,
926 privacy);
927
928 spin_lock_bh(&rdev->bss_lock);
929
930 list_for_each_entry(bss, &rdev->bss_list, list) {
931 if (!cfg80211_bss_type_match(bss->pub.capability,
932 bss->pub.channel->band, bss_type))
933 continue;
934
935 bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY);
936 if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) ||
937 (privacy == IEEE80211_PRIVACY_OFF && bss_privacy))
938 continue;
939 if (channel && bss->pub.channel != channel)
940 continue;
941 if (!is_valid_ether_addr(bss->pub.bssid))
942 continue;
943
944 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
945 !atomic_read(&bss->hold))
946 continue;
947 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
948 res = bss;
949 bss_ref_get(rdev, res);
950 break;
951 }
952 }
953
954 spin_unlock_bh(&rdev->bss_lock);
955 if (!res)
956 return NULL;
957 trace_cfg80211_return_bss(&res->pub);
958 return &res->pub;
959}
960EXPORT_SYMBOL(cfg80211_get_bss);
961
962static void rb_insert_bss(struct cfg80211_registered_device *rdev,
963 struct cfg80211_internal_bss *bss)
964{
965 struct rb_node **p = &rdev->bss_tree.rb_node;
966 struct rb_node *parent = NULL;
967 struct cfg80211_internal_bss *tbss;
968 int cmp;
969
970 while (*p) {
971 parent = *p;
972 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
973
974 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR);
975
976 if (WARN_ON(!cmp)) {
977
978 return;
979 }
980
981 if (cmp < 0)
982 p = &(*p)->rb_left;
983 else
984 p = &(*p)->rb_right;
985 }
986
987 rb_link_node(&bss->rbn, parent, p);
988 rb_insert_color(&bss->rbn, &rdev->bss_tree);
989}
990
991static struct cfg80211_internal_bss *
992rb_find_bss(struct cfg80211_registered_device *rdev,
993 struct cfg80211_internal_bss *res,
994 enum bss_compare_mode mode)
995{
996 struct rb_node *n = rdev->bss_tree.rb_node;
997 struct cfg80211_internal_bss *bss;
998 int r;
999
1000 while (n) {
1001 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
1002 r = cmp_bss(&res->pub, &bss->pub, mode);
1003
1004 if (r == 0)
1005 return bss;
1006 else if (r < 0)
1007 n = n->rb_left;
1008 else
1009 n = n->rb_right;
1010 }
1011
1012 return NULL;
1013}
1014
1015static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev,
1016 struct cfg80211_internal_bss *new)
1017{
1018 const struct cfg80211_bss_ies *ies;
1019 struct cfg80211_internal_bss *bss;
1020 const u8 *ie;
1021 int i, ssidlen;
1022 u8 fold = 0;
1023 u32 n_entries = 0;
1024
1025 ies = rcu_access_pointer(new->pub.beacon_ies);
1026 if (WARN_ON(!ies))
1027 return false;
1028
1029 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
1030 if (!ie) {
1031
1032 return true;
1033 }
1034
1035 ssidlen = ie[1];
1036 for (i = 0; i < ssidlen; i++)
1037 fold |= ie[2 + i];
1038
1039 if (fold) {
1040
1041 return true;
1042 }
1043
1044
1045
1046 list_for_each_entry(bss, &rdev->bss_list, list) {
1047
1048
1049
1050
1051 n_entries++;
1052
1053 if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid))
1054 continue;
1055 if (bss->pub.channel != new->pub.channel)
1056 continue;
1057 if (bss->pub.scan_width != new->pub.scan_width)
1058 continue;
1059 if (rcu_access_pointer(bss->pub.beacon_ies))
1060 continue;
1061 ies = rcu_access_pointer(bss->pub.ies);
1062 if (!ies)
1063 continue;
1064 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
1065 if (!ie)
1066 continue;
1067 if (ssidlen && ie[1] != ssidlen)
1068 continue;
1069 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss))
1070 continue;
1071 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list)))
1072 list_del(&bss->hidden_list);
1073
1074 list_add(&bss->hidden_list, &new->hidden_list);
1075 bss->pub.hidden_beacon_bss = &new->pub;
1076 new->refcount += bss->refcount;
1077 rcu_assign_pointer(bss->pub.beacon_ies,
1078 new->pub.beacon_ies);
1079 }
1080
1081 WARN_ONCE(n_entries != rdev->bss_entries,
1082 "rdev bss entries[%d]/list[len:%d] corruption\n",
1083 rdev->bss_entries, n_entries);
1084
1085 return true;
1086}
1087
1088struct cfg80211_non_tx_bss {
1089 struct cfg80211_bss *tx_bss;
1090 u8 max_bssid_indicator;
1091 u8 bssid_index;
1092};
1093
1094
1095struct cfg80211_internal_bss *
1096cfg80211_bss_update(struct cfg80211_registered_device *rdev,
1097 struct cfg80211_internal_bss *tmp,
1098 bool signal_valid, unsigned long ts)
1099{
1100 struct cfg80211_internal_bss *found = NULL;
1101
1102 if (WARN_ON(!tmp->pub.channel))
1103 return NULL;
1104
1105 tmp->ts = ts;
1106
1107 spin_lock_bh(&rdev->bss_lock);
1108
1109 if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
1110 spin_unlock_bh(&rdev->bss_lock);
1111 return NULL;
1112 }
1113
1114 found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR);
1115
1116 if (found) {
1117
1118 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
1119 const struct cfg80211_bss_ies *old;
1120
1121 old = rcu_access_pointer(found->pub.proberesp_ies);
1122
1123 rcu_assign_pointer(found->pub.proberesp_ies,
1124 tmp->pub.proberesp_ies);
1125
1126 rcu_assign_pointer(found->pub.ies,
1127 tmp->pub.proberesp_ies);
1128 if (old)
1129 kfree_rcu((struct cfg80211_bss_ies *)old,
1130 rcu_head);
1131 } else if (rcu_access_pointer(tmp->pub.beacon_ies)) {
1132 const struct cfg80211_bss_ies *old;
1133 struct cfg80211_internal_bss *bss;
1134
1135 if (found->pub.hidden_beacon_bss &&
1136 !list_empty(&found->hidden_list)) {
1137 const struct cfg80211_bss_ies *f;
1138
1139
1140
1141
1142
1143
1144
1145
1146
1147
1148
1149 f = rcu_access_pointer(tmp->pub.beacon_ies);
1150 kfree_rcu((struct cfg80211_bss_ies *)f,
1151 rcu_head);
1152 goto drop;
1153 }
1154
1155 old = rcu_access_pointer(found->pub.beacon_ies);
1156
1157 rcu_assign_pointer(found->pub.beacon_ies,
1158 tmp->pub.beacon_ies);
1159
1160
1161 if (old == rcu_access_pointer(found->pub.ies))
1162 rcu_assign_pointer(found->pub.ies,
1163 tmp->pub.beacon_ies);
1164
1165
1166 list_for_each_entry(bss, &found->hidden_list,
1167 hidden_list) {
1168 const struct cfg80211_bss_ies *ies;
1169
1170 ies = rcu_access_pointer(bss->pub.beacon_ies);
1171 WARN_ON(ies != old);
1172
1173 rcu_assign_pointer(bss->pub.beacon_ies,
1174 tmp->pub.beacon_ies);
1175 }
1176
1177 if (old)
1178 kfree_rcu((struct cfg80211_bss_ies *)old,
1179 rcu_head);
1180 }
1181
1182 found->pub.beacon_interval = tmp->pub.beacon_interval;
1183
1184
1185
1186
1187 if (signal_valid)
1188 found->pub.signal = tmp->pub.signal;
1189 found->pub.capability = tmp->pub.capability;
1190 found->ts = tmp->ts;
1191 found->ts_boottime = tmp->ts_boottime;
1192 found->parent_tsf = tmp->parent_tsf;
1193 found->pub.chains = tmp->pub.chains;
1194 memcpy(found->pub.chain_signal, tmp->pub.chain_signal,
1195 IEEE80211_MAX_CHAINS);
1196 ether_addr_copy(found->parent_bssid, tmp->parent_bssid);
1197 found->pub.max_bssid_indicator = tmp->pub.max_bssid_indicator;
1198 found->pub.bssid_index = tmp->pub.bssid_index;
1199 } else {
1200 struct cfg80211_internal_bss *new;
1201 struct cfg80211_internal_bss *hidden;
1202 struct cfg80211_bss_ies *ies;
1203
1204
1205
1206
1207
1208
1209 new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size,
1210 GFP_ATOMIC);
1211 if (!new) {
1212 ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
1213 if (ies)
1214 kfree_rcu(ies, rcu_head);
1215 ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
1216 if (ies)
1217 kfree_rcu(ies, rcu_head);
1218 goto drop;
1219 }
1220 memcpy(new, tmp, sizeof(*new));
1221 new->refcount = 1;
1222 INIT_LIST_HEAD(&new->hidden_list);
1223 INIT_LIST_HEAD(&new->pub.nontrans_list);
1224
1225 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
1226 hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
1227 if (!hidden)
1228 hidden = rb_find_bss(rdev, tmp,
1229 BSS_CMP_HIDE_NUL);
1230 if (hidden) {
1231 new->pub.hidden_beacon_bss = &hidden->pub;
1232 list_add(&new->hidden_list,
1233 &hidden->hidden_list);
1234 hidden->refcount++;
1235 rcu_assign_pointer(new->pub.beacon_ies,
1236 hidden->pub.beacon_ies);
1237 }
1238 } else {
1239
1240
1241
1242
1243
1244
1245 if (!cfg80211_combine_bsses(rdev, new)) {
1246 kfree(new);
1247 goto drop;
1248 }
1249 }
1250
1251 if (rdev->bss_entries >= bss_entries_limit &&
1252 !cfg80211_bss_expire_oldest(rdev)) {
1253 kfree(new);
1254 goto drop;
1255 }
1256
1257
1258 if (tmp->pub.transmitted_bss) {
1259 struct cfg80211_internal_bss *pbss =
1260 container_of(tmp->pub.transmitted_bss,
1261 struct cfg80211_internal_bss,
1262 pub);
1263
1264 new->pub.transmitted_bss = tmp->pub.transmitted_bss;
1265 bss_ref_get(rdev, pbss);
1266 }
1267
1268 list_add_tail(&new->list, &rdev->bss_list);
1269 rdev->bss_entries++;
1270 rb_insert_bss(rdev, new);
1271 found = new;
1272 }
1273
1274 rdev->bss_generation++;
1275 bss_ref_get(rdev, found);
1276 spin_unlock_bh(&rdev->bss_lock);
1277
1278 return found;
1279 drop:
1280 spin_unlock_bh(&rdev->bss_lock);
1281 return NULL;
1282}
1283
1284
1285
1286
1287
1288
1289
1290
1291
1292static struct ieee80211_channel *
1293cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
1294 struct ieee80211_channel *channel,
1295 enum nl80211_bss_scan_width scan_width)
1296{
1297 const u8 *tmp;
1298 u32 freq;
1299 int channel_number = -1;
1300 struct ieee80211_channel *alt_channel;
1301
1302 tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen);
1303 if (tmp && tmp[1] == 1) {
1304 channel_number = tmp[2];
1305 } else {
1306 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen);
1307 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) {
1308 struct ieee80211_ht_operation *htop = (void *)(tmp + 2);
1309
1310 channel_number = htop->primary_chan;
1311 }
1312 }
1313
1314 if (channel_number < 0) {
1315
1316 return channel;
1317 }
1318
1319 freq = ieee80211_channel_to_frequency(channel_number, channel->band);
1320 alt_channel = ieee80211_get_channel(wiphy, freq);
1321 if (!alt_channel) {
1322 if (channel->band == NL80211_BAND_2GHZ) {
1323
1324
1325
1326
1327
1328
1329 return NULL;
1330 }
1331
1332
1333 return channel;
1334 }
1335
1336 if (scan_width == NL80211_BSS_CHAN_WIDTH_10 ||
1337 scan_width == NL80211_BSS_CHAN_WIDTH_5) {
1338
1339
1340
1341
1342
1343 return channel;
1344 }
1345
1346
1347
1348
1349
1350 if (alt_channel->flags & IEEE80211_CHAN_DISABLED)
1351 return NULL;
1352 return alt_channel;
1353}
1354
1355
1356static struct cfg80211_bss *
1357cfg80211_inform_single_bss_data(struct wiphy *wiphy,
1358 struct cfg80211_inform_bss *data,
1359 enum cfg80211_bss_frame_type ftype,
1360 const u8 *bssid, u64 tsf, u16 capability,
1361 u16 beacon_interval, const u8 *ie, size_t ielen,
1362 struct cfg80211_non_tx_bss *non_tx_data,
1363 gfp_t gfp)
1364{
1365 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1366 struct cfg80211_bss_ies *ies;
1367 struct ieee80211_channel *channel;
1368 struct cfg80211_internal_bss tmp = {}, *res;
1369 int bss_type;
1370 bool signal_valid;
1371
1372 if (WARN_ON(!wiphy))
1373 return NULL;
1374
1375 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
1376 (data->signal < 0 || data->signal > 100)))
1377 return NULL;
1378
1379 channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan,
1380 data->scan_width);
1381 if (!channel)
1382 return NULL;
1383
1384 memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
1385 tmp.pub.channel = channel;
1386 tmp.pub.scan_width = data->scan_width;
1387 tmp.pub.signal = data->signal;
1388 tmp.pub.beacon_interval = beacon_interval;
1389 tmp.pub.capability = capability;
1390 tmp.ts_boottime = data->boottime_ns;
1391 if (non_tx_data) {
1392 tmp.pub.transmitted_bss = non_tx_data->tx_bss;
1393 tmp.pub.bssid_index = non_tx_data->bssid_index;
1394 tmp.pub.max_bssid_indicator = non_tx_data->max_bssid_indicator;
1395 }
1396
1397
1398
1399
1400
1401
1402
1403
1404
1405 ies = kzalloc(sizeof(*ies) + ielen, gfp);
1406 if (!ies)
1407 return NULL;
1408 ies->len = ielen;
1409 ies->tsf = tsf;
1410 ies->from_beacon = false;
1411 memcpy(ies->data, ie, ielen);
1412
1413 switch (ftype) {
1414 case CFG80211_BSS_FTYPE_BEACON:
1415 ies->from_beacon = true;
1416
1417 case CFG80211_BSS_FTYPE_UNKNOWN:
1418 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1419 break;
1420 case CFG80211_BSS_FTYPE_PRESP:
1421 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1422 break;
1423 }
1424 rcu_assign_pointer(tmp.pub.ies, ies);
1425
1426 signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
1427 wiphy->max_adj_channel_rssi_comp;
1428 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid,
1429 jiffies);
1430 if (!res)
1431 return NULL;
1432
1433 if (channel->band == NL80211_BAND_60GHZ) {
1434 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1435 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1436 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1437 regulatory_hint_found_beacon(wiphy, channel, gfp);
1438 } else {
1439 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1440 regulatory_hint_found_beacon(wiphy, channel, gfp);
1441 }
1442
1443 if (non_tx_data && non_tx_data->tx_bss) {
1444
1445
1446
1447 if (cfg80211_add_nontrans_list(non_tx_data->tx_bss,
1448 &res->pub)) {
1449 if (__cfg80211_unlink_bss(rdev, res))
1450 rdev->bss_generation++;
1451 }
1452 }
1453
1454 trace_cfg80211_return_bss(&res->pub);
1455
1456 return &res->pub;
1457}
1458
1459static const struct element
1460*cfg80211_get_profile_continuation(const u8 *ie, size_t ielen,
1461 const struct element *mbssid_elem,
1462 const struct element *sub_elem)
1463{
1464 const u8 *mbssid_end = mbssid_elem->data + mbssid_elem->datalen;
1465 const struct element *next_mbssid;
1466 const struct element *next_sub;
1467
1468 next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID,
1469 mbssid_end,
1470 ielen - (mbssid_end - ie));
1471
1472
1473
1474
1475
1476 if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) ||
1477 !next_mbssid)
1478 return NULL;
1479
1480
1481
1482 if (next_mbssid->datalen < 4)
1483 return NULL;
1484
1485 next_sub = (void *)&next_mbssid->data[1];
1486
1487 if (next_mbssid->data + next_mbssid->datalen <
1488 next_sub->data + next_sub->datalen)
1489 return NULL;
1490
1491 if (next_sub->id != 0 || next_sub->datalen < 2)
1492 return NULL;
1493
1494
1495
1496
1497
1498 return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ?
1499 NULL : next_mbssid;
1500}
1501
1502size_t cfg80211_merge_profile(const u8 *ie, size_t ielen,
1503 const struct element *mbssid_elem,
1504 const struct element *sub_elem,
1505 u8 *merged_ie, size_t max_copy_len)
1506{
1507 size_t copied_len = sub_elem->datalen;
1508 const struct element *next_mbssid;
1509
1510 if (sub_elem->datalen > max_copy_len)
1511 return 0;
1512
1513 memcpy(merged_ie, sub_elem->data, sub_elem->datalen);
1514
1515 while ((next_mbssid = cfg80211_get_profile_continuation(ie, ielen,
1516 mbssid_elem,
1517 sub_elem))) {
1518 const struct element *next_sub = (void *)&next_mbssid->data[1];
1519
1520 if (copied_len + next_sub->datalen > max_copy_len)
1521 break;
1522 memcpy(merged_ie + copied_len, next_sub->data,
1523 next_sub->datalen);
1524 copied_len += next_sub->datalen;
1525 }
1526
1527 return copied_len;
1528}
1529EXPORT_SYMBOL(cfg80211_merge_profile);
1530
1531static void cfg80211_parse_mbssid_data(struct wiphy *wiphy,
1532 struct cfg80211_inform_bss *data,
1533 enum cfg80211_bss_frame_type ftype,
1534 const u8 *bssid, u64 tsf,
1535 u16 beacon_interval, const u8 *ie,
1536 size_t ielen,
1537 struct cfg80211_non_tx_bss *non_tx_data,
1538 gfp_t gfp)
1539{
1540 const u8 *mbssid_index_ie;
1541 const struct element *elem, *sub;
1542 size_t new_ie_len;
1543 u8 new_bssid[ETH_ALEN];
1544 u8 *new_ie, *profile;
1545 u64 seen_indices = 0;
1546 u16 capability;
1547 struct cfg80211_bss *bss;
1548
1549 if (!non_tx_data)
1550 return;
1551 if (!cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
1552 return;
1553 if (!wiphy->support_mbssid)
1554 return;
1555 if (wiphy->support_only_he_mbssid &&
1556 !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
1557 return;
1558
1559 new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp);
1560 if (!new_ie)
1561 return;
1562
1563 profile = kmalloc(ielen, gfp);
1564 if (!profile)
1565 goto out;
1566
1567 for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, ie, ielen) {
1568 if (elem->datalen < 4)
1569 continue;
1570 for_each_element(sub, elem->data + 1, elem->datalen - 1) {
1571 u8 profile_len;
1572
1573 if (sub->id != 0 || sub->datalen < 4) {
1574
1575 continue;
1576 }
1577
1578 if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP ||
1579 sub->data[1] != 2) {
1580
1581
1582
1583
1584 continue;
1585 }
1586
1587 memset(profile, 0, ielen);
1588 profile_len = cfg80211_merge_profile(ie, ielen,
1589 elem,
1590 sub,
1591 profile,
1592 ielen);
1593
1594
1595 mbssid_index_ie = cfg80211_find_ie
1596 (WLAN_EID_MULTI_BSSID_IDX,
1597 profile, profile_len);
1598 if (!mbssid_index_ie || mbssid_index_ie[1] < 1 ||
1599 mbssid_index_ie[2] == 0 ||
1600 mbssid_index_ie[2] > 46) {
1601
1602 continue;
1603 }
1604
1605 if (seen_indices & BIT_ULL(mbssid_index_ie[2]))
1606
1607 net_dbg_ratelimited("Partial info for BSSID index %d\n",
1608 mbssid_index_ie[2]);
1609
1610 seen_indices |= BIT_ULL(mbssid_index_ie[2]);
1611
1612 non_tx_data->bssid_index = mbssid_index_ie[2];
1613 non_tx_data->max_bssid_indicator = elem->data[0];
1614
1615 cfg80211_gen_new_bssid(bssid,
1616 non_tx_data->max_bssid_indicator,
1617 non_tx_data->bssid_index,
1618 new_bssid);
1619 memset(new_ie, 0, IEEE80211_MAX_DATA_LEN);
1620 new_ie_len = cfg80211_gen_new_ie(ie, ielen,
1621 profile,
1622 profile_len, new_ie,
1623 gfp);
1624 if (!new_ie_len)
1625 continue;
1626
1627 capability = get_unaligned_le16(profile + 2);
1628 bss = cfg80211_inform_single_bss_data(wiphy, data,
1629 ftype,
1630 new_bssid, tsf,
1631 capability,
1632 beacon_interval,
1633 new_ie,
1634 new_ie_len,
1635 non_tx_data,
1636 gfp);
1637 if (!bss)
1638 break;
1639 cfg80211_put_bss(wiphy, bss);
1640 }
1641 }
1642
1643out:
1644 kfree(new_ie);
1645 kfree(profile);
1646}
1647
1648struct cfg80211_bss *
1649cfg80211_inform_bss_data(struct wiphy *wiphy,
1650 struct cfg80211_inform_bss *data,
1651 enum cfg80211_bss_frame_type ftype,
1652 const u8 *bssid, u64 tsf, u16 capability,
1653 u16 beacon_interval, const u8 *ie, size_t ielen,
1654 gfp_t gfp)
1655{
1656 struct cfg80211_bss *res;
1657 struct cfg80211_non_tx_bss non_tx_data;
1658
1659 res = cfg80211_inform_single_bss_data(wiphy, data, ftype, bssid, tsf,
1660 capability, beacon_interval, ie,
1661 ielen, NULL, gfp);
1662 non_tx_data.tx_bss = res;
1663 cfg80211_parse_mbssid_data(wiphy, data, ftype, bssid, tsf,
1664 beacon_interval, ie, ielen, &non_tx_data,
1665 gfp);
1666 return res;
1667}
1668EXPORT_SYMBOL(cfg80211_inform_bss_data);
1669
1670static void
1671cfg80211_parse_mbssid_frame_data(struct wiphy *wiphy,
1672 struct cfg80211_inform_bss *data,
1673 struct ieee80211_mgmt *mgmt, size_t len,
1674 struct cfg80211_non_tx_bss *non_tx_data,
1675 gfp_t gfp)
1676{
1677 enum cfg80211_bss_frame_type ftype;
1678 const u8 *ie = mgmt->u.probe_resp.variable;
1679 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1680 u.probe_resp.variable);
1681
1682 ftype = ieee80211_is_beacon(mgmt->frame_control) ?
1683 CFG80211_BSS_FTYPE_BEACON : CFG80211_BSS_FTYPE_PRESP;
1684
1685 cfg80211_parse_mbssid_data(wiphy, data, ftype, mgmt->bssid,
1686 le64_to_cpu(mgmt->u.probe_resp.timestamp),
1687 le16_to_cpu(mgmt->u.probe_resp.beacon_int),
1688 ie, ielen, non_tx_data, gfp);
1689}
1690
1691static void
1692cfg80211_update_notlisted_nontrans(struct wiphy *wiphy,
1693 struct cfg80211_bss *nontrans_bss,
1694 struct ieee80211_mgmt *mgmt, size_t len,
1695 gfp_t gfp)
1696{
1697 u8 *ie, *new_ie, *pos;
1698 const u8 *nontrans_ssid, *trans_ssid, *mbssid;
1699 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1700 u.probe_resp.variable);
1701 size_t new_ie_len;
1702 struct cfg80211_bss_ies *new_ies;
1703 const struct cfg80211_bss_ies *old;
1704 u8 cpy_len;
1705
1706 ie = mgmt->u.probe_resp.variable;
1707
1708 new_ie_len = ielen;
1709 trans_ssid = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
1710 if (!trans_ssid)
1711 return;
1712 new_ie_len -= trans_ssid[1];
1713 mbssid = cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen);
1714 if (!mbssid)
1715 return;
1716 new_ie_len -= mbssid[1];
1717 rcu_read_lock();
1718 nontrans_ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
1719 if (!nontrans_ssid) {
1720 rcu_read_unlock();
1721 return;
1722 }
1723 new_ie_len += nontrans_ssid[1];
1724 rcu_read_unlock();
1725
1726
1727
1728
1729
1730 new_ie = kzalloc(new_ie_len, gfp);
1731 if (!new_ie)
1732 return;
1733 new_ies = kzalloc(sizeof(*new_ies) + new_ie_len, gfp);
1734 if (!new_ies)
1735 goto out_free;
1736
1737 pos = new_ie;
1738
1739
1740 cpy_len = nontrans_ssid[1] + 2;
1741 memcpy(pos, nontrans_ssid, cpy_len);
1742 pos += cpy_len;
1743
1744 cpy_len = trans_ssid[1] + 2;
1745 memcpy(pos, (trans_ssid + cpy_len), (mbssid - (trans_ssid + cpy_len)));
1746 pos += (mbssid - (trans_ssid + cpy_len));
1747
1748 cpy_len = mbssid[1] + 2;
1749 memcpy(pos, mbssid + cpy_len, ((ie + ielen) - (mbssid + cpy_len)));
1750
1751
1752 new_ies->len = new_ie_len;
1753 new_ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
1754 new_ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
1755 memcpy(new_ies->data, new_ie, new_ie_len);
1756 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
1757 old = rcu_access_pointer(nontrans_bss->proberesp_ies);
1758 rcu_assign_pointer(nontrans_bss->proberesp_ies, new_ies);
1759 rcu_assign_pointer(nontrans_bss->ies, new_ies);
1760 if (old)
1761 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1762 } else {
1763 old = rcu_access_pointer(nontrans_bss->beacon_ies);
1764 rcu_assign_pointer(nontrans_bss->beacon_ies, new_ies);
1765 rcu_assign_pointer(nontrans_bss->ies, new_ies);
1766 if (old)
1767 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1768 }
1769
1770out_free:
1771 kfree(new_ie);
1772}
1773
1774
1775static struct cfg80211_bss *
1776cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
1777 struct cfg80211_inform_bss *data,
1778 struct ieee80211_mgmt *mgmt, size_t len,
1779 struct cfg80211_non_tx_bss *non_tx_data,
1780 gfp_t gfp)
1781{
1782 struct cfg80211_internal_bss tmp = {}, *res;
1783 struct cfg80211_bss_ies *ies;
1784 struct ieee80211_channel *channel;
1785 bool signal_valid;
1786 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1787 u.probe_resp.variable);
1788 int bss_type;
1789
1790 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
1791 offsetof(struct ieee80211_mgmt, u.beacon.variable));
1792
1793 trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len);
1794
1795 if (WARN_ON(!mgmt))
1796 return NULL;
1797
1798 if (WARN_ON(!wiphy))
1799 return NULL;
1800
1801 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
1802 (data->signal < 0 || data->signal > 100)))
1803 return NULL;
1804
1805 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
1806 return NULL;
1807
1808 channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable,
1809 ielen, data->chan, data->scan_width);
1810 if (!channel)
1811 return NULL;
1812
1813 ies = kzalloc(sizeof(*ies) + ielen, gfp);
1814 if (!ies)
1815 return NULL;
1816 ies->len = ielen;
1817 ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
1818 ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
1819 memcpy(ies->data, mgmt->u.probe_resp.variable, ielen);
1820
1821 if (ieee80211_is_probe_resp(mgmt->frame_control))
1822 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1823 else
1824 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1825 rcu_assign_pointer(tmp.pub.ies, ies);
1826
1827 memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN);
1828 tmp.pub.channel = channel;
1829 tmp.pub.scan_width = data->scan_width;
1830 tmp.pub.signal = data->signal;
1831 tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
1832 tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
1833 tmp.ts_boottime = data->boottime_ns;
1834 tmp.parent_tsf = data->parent_tsf;
1835 tmp.pub.chains = data->chains;
1836 memcpy(tmp.pub.chain_signal, data->chain_signal, IEEE80211_MAX_CHAINS);
1837 ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
1838 if (non_tx_data) {
1839 tmp.pub.transmitted_bss = non_tx_data->tx_bss;
1840 tmp.pub.bssid_index = non_tx_data->bssid_index;
1841 tmp.pub.max_bssid_indicator = non_tx_data->max_bssid_indicator;
1842 }
1843
1844 signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
1845 wiphy->max_adj_channel_rssi_comp;
1846 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid,
1847 jiffies);
1848 if (!res)
1849 return NULL;
1850
1851 if (channel->band == NL80211_BAND_60GHZ) {
1852 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1853 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1854 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1855 regulatory_hint_found_beacon(wiphy, channel, gfp);
1856 } else {
1857 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1858 regulatory_hint_found_beacon(wiphy, channel, gfp);
1859 }
1860
1861 trace_cfg80211_return_bss(&res->pub);
1862
1863 return &res->pub;
1864}
1865
1866struct cfg80211_bss *
1867cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
1868 struct cfg80211_inform_bss *data,
1869 struct ieee80211_mgmt *mgmt, size_t len,
1870 gfp_t gfp)
1871{
1872 struct cfg80211_bss *res, *tmp_bss;
1873 const u8 *ie = mgmt->u.probe_resp.variable;
1874 const struct cfg80211_bss_ies *ies1, *ies2;
1875 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1876 u.probe_resp.variable);
1877 struct cfg80211_non_tx_bss non_tx_data;
1878
1879 res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt,
1880 len, NULL, gfp);
1881 if (!res || !wiphy->support_mbssid ||
1882 !cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
1883 return res;
1884 if (wiphy->support_only_he_mbssid &&
1885 !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
1886 return res;
1887
1888 non_tx_data.tx_bss = res;
1889
1890 cfg80211_parse_mbssid_frame_data(wiphy, data, mgmt, len,
1891 &non_tx_data, gfp);
1892
1893
1894
1895
1896 ies1 = rcu_access_pointer(res->ies);
1897
1898
1899
1900
1901
1902 list_for_each_entry(tmp_bss, &res->nontrans_list,
1903 nontrans_list) {
1904 ies2 = rcu_access_pointer(tmp_bss->ies);
1905 if (ies2->tsf < ies1->tsf)
1906 cfg80211_update_notlisted_nontrans(wiphy, tmp_bss,
1907 mgmt, len, gfp);
1908 }
1909
1910 return res;
1911}
1912EXPORT_SYMBOL(cfg80211_inform_bss_frame_data);
1913
1914void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1915{
1916 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1917 struct cfg80211_internal_bss *bss;
1918
1919 if (!pub)
1920 return;
1921
1922 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1923
1924 spin_lock_bh(&rdev->bss_lock);
1925 bss_ref_get(rdev, bss);
1926 spin_unlock_bh(&rdev->bss_lock);
1927}
1928EXPORT_SYMBOL(cfg80211_ref_bss);
1929
1930void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1931{
1932 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1933 struct cfg80211_internal_bss *bss;
1934
1935 if (!pub)
1936 return;
1937
1938 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1939
1940 spin_lock_bh(&rdev->bss_lock);
1941 bss_ref_put(rdev, bss);
1942 spin_unlock_bh(&rdev->bss_lock);
1943}
1944EXPORT_SYMBOL(cfg80211_put_bss);
1945
1946void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1947{
1948 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1949 struct cfg80211_internal_bss *bss, *tmp1;
1950 struct cfg80211_bss *nontrans_bss, *tmp;
1951
1952 if (WARN_ON(!pub))
1953 return;
1954
1955 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1956
1957 spin_lock_bh(&rdev->bss_lock);
1958 if (list_empty(&bss->list))
1959 goto out;
1960
1961 list_for_each_entry_safe(nontrans_bss, tmp,
1962 &pub->nontrans_list,
1963 nontrans_list) {
1964 tmp1 = container_of(nontrans_bss,
1965 struct cfg80211_internal_bss, pub);
1966 if (__cfg80211_unlink_bss(rdev, tmp1))
1967 rdev->bss_generation++;
1968 }
1969
1970 if (__cfg80211_unlink_bss(rdev, bss))
1971 rdev->bss_generation++;
1972out:
1973 spin_unlock_bh(&rdev->bss_lock);
1974}
1975EXPORT_SYMBOL(cfg80211_unlink_bss);
1976
1977void cfg80211_bss_iter(struct wiphy *wiphy,
1978 struct cfg80211_chan_def *chandef,
1979 void (*iter)(struct wiphy *wiphy,
1980 struct cfg80211_bss *bss,
1981 void *data),
1982 void *iter_data)
1983{
1984 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1985 struct cfg80211_internal_bss *bss;
1986
1987 spin_lock_bh(&rdev->bss_lock);
1988
1989 list_for_each_entry(bss, &rdev->bss_list, list) {
1990 if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel))
1991 iter(wiphy, &bss->pub, iter_data);
1992 }
1993
1994 spin_unlock_bh(&rdev->bss_lock);
1995}
1996EXPORT_SYMBOL(cfg80211_bss_iter);
1997
1998#ifdef CONFIG_CFG80211_WEXT
1999static struct cfg80211_registered_device *
2000cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
2001{
2002 struct cfg80211_registered_device *rdev;
2003 struct net_device *dev;
2004
2005 ASSERT_RTNL();
2006
2007 dev = dev_get_by_index(net, ifindex);
2008 if (!dev)
2009 return ERR_PTR(-ENODEV);
2010 if (dev->ieee80211_ptr)
2011 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
2012 else
2013 rdev = ERR_PTR(-ENODEV);
2014 dev_put(dev);
2015 return rdev;
2016}
2017
2018int cfg80211_wext_siwscan(struct net_device *dev,
2019 struct iw_request_info *info,
2020 union iwreq_data *wrqu, char *extra)
2021{
2022 struct cfg80211_registered_device *rdev;
2023 struct wiphy *wiphy;
2024 struct iw_scan_req *wreq = NULL;
2025 struct cfg80211_scan_request *creq = NULL;
2026 int i, err, n_channels = 0;
2027 enum nl80211_band band;
2028
2029 if (!netif_running(dev))
2030 return -ENETDOWN;
2031
2032 if (wrqu->data.length == sizeof(struct iw_scan_req))
2033 wreq = (struct iw_scan_req *)extra;
2034
2035 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2036
2037 if (IS_ERR(rdev))
2038 return PTR_ERR(rdev);
2039
2040 if (rdev->scan_req || rdev->scan_msg) {
2041 err = -EBUSY;
2042 goto out;
2043 }
2044
2045 wiphy = &rdev->wiphy;
2046
2047
2048 if (wreq && wreq->num_channels)
2049 n_channels = wreq->num_channels;
2050 else
2051 n_channels = ieee80211_get_num_supported_channels(wiphy);
2052
2053 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
2054 n_channels * sizeof(void *),
2055 GFP_ATOMIC);
2056 if (!creq) {
2057 err = -ENOMEM;
2058 goto out;
2059 }
2060
2061 creq->wiphy = wiphy;
2062 creq->wdev = dev->ieee80211_ptr;
2063
2064 creq->ssids = (void *)&creq->channels[n_channels];
2065 creq->n_channels = n_channels;
2066 creq->n_ssids = 1;
2067 creq->scan_start = jiffies;
2068
2069
2070 i = 0;
2071 for (band = 0; band < NUM_NL80211_BANDS; band++) {
2072 int j;
2073
2074 if (!wiphy->bands[band])
2075 continue;
2076
2077 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
2078
2079 if (wiphy->bands[band]->channels[j].flags &
2080 IEEE80211_CHAN_DISABLED)
2081 continue;
2082
2083
2084
2085
2086
2087 if (wreq && wreq->num_channels) {
2088 int k;
2089 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
2090 for (k = 0; k < wreq->num_channels; k++) {
2091 struct iw_freq *freq =
2092 &wreq->channel_list[k];
2093 int wext_freq =
2094 cfg80211_wext_freq(freq);
2095
2096 if (wext_freq == wiphy_freq)
2097 goto wext_freq_found;
2098 }
2099 goto wext_freq_not_found;
2100 }
2101
2102 wext_freq_found:
2103 creq->channels[i] = &wiphy->bands[band]->channels[j];
2104 i++;
2105 wext_freq_not_found: ;
2106 }
2107 }
2108
2109 if (!i) {
2110 err = -EINVAL;
2111 goto out;
2112 }
2113
2114
2115 creq->n_channels = i;
2116
2117
2118 if (wreq) {
2119 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
2120 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
2121 err = -EINVAL;
2122 goto out;
2123 }
2124 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
2125 creq->ssids[0].ssid_len = wreq->essid_len;
2126 }
2127 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
2128 creq->n_ssids = 0;
2129 }
2130
2131 for (i = 0; i < NUM_NL80211_BANDS; i++)
2132 if (wiphy->bands[i])
2133 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
2134
2135 eth_broadcast_addr(creq->bssid);
2136
2137 rdev->scan_req = creq;
2138 err = rdev_scan(rdev, creq);
2139 if (err) {
2140 rdev->scan_req = NULL;
2141
2142 } else {
2143 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
2144
2145 creq = NULL;
2146 dev_hold(dev);
2147 }
2148 out:
2149 kfree(creq);
2150 return err;
2151}
2152EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
2153
2154static char *ieee80211_scan_add_ies(struct iw_request_info *info,
2155 const struct cfg80211_bss_ies *ies,
2156 char *current_ev, char *end_buf)
2157{
2158 const u8 *pos, *end, *next;
2159 struct iw_event iwe;
2160
2161 if (!ies)
2162 return current_ev;
2163
2164
2165
2166
2167
2168 pos = ies->data;
2169 end = pos + ies->len;
2170
2171 while (end - pos > IW_GENERIC_IE_MAX) {
2172 next = pos + 2 + pos[1];
2173 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
2174 next = next + 2 + next[1];
2175
2176 memset(&iwe, 0, sizeof(iwe));
2177 iwe.cmd = IWEVGENIE;
2178 iwe.u.data.length = next - pos;
2179 current_ev = iwe_stream_add_point_check(info, current_ev,
2180 end_buf, &iwe,
2181 (void *)pos);
2182 if (IS_ERR(current_ev))
2183 return current_ev;
2184 pos = next;
2185 }
2186
2187 if (end > pos) {
2188 memset(&iwe, 0, sizeof(iwe));
2189 iwe.cmd = IWEVGENIE;
2190 iwe.u.data.length = end - pos;
2191 current_ev = iwe_stream_add_point_check(info, current_ev,
2192 end_buf, &iwe,
2193 (void *)pos);
2194 if (IS_ERR(current_ev))
2195 return current_ev;
2196 }
2197
2198 return current_ev;
2199}
2200
2201static char *
2202ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
2203 struct cfg80211_internal_bss *bss, char *current_ev,
2204 char *end_buf)
2205{
2206 const struct cfg80211_bss_ies *ies;
2207 struct iw_event iwe;
2208 const u8 *ie;
2209 u8 buf[50];
2210 u8 *cfg, *p, *tmp;
2211 int rem, i, sig;
2212 bool ismesh = false;
2213
2214 memset(&iwe, 0, sizeof(iwe));
2215 iwe.cmd = SIOCGIWAP;
2216 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
2217 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
2218 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2219 IW_EV_ADDR_LEN);
2220 if (IS_ERR(current_ev))
2221 return current_ev;
2222
2223 memset(&iwe, 0, sizeof(iwe));
2224 iwe.cmd = SIOCGIWFREQ;
2225 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
2226 iwe.u.freq.e = 0;
2227 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2228 IW_EV_FREQ_LEN);
2229 if (IS_ERR(current_ev))
2230 return current_ev;
2231
2232 memset(&iwe, 0, sizeof(iwe));
2233 iwe.cmd = SIOCGIWFREQ;
2234 iwe.u.freq.m = bss->pub.channel->center_freq;
2235 iwe.u.freq.e = 6;
2236 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2237 IW_EV_FREQ_LEN);
2238 if (IS_ERR(current_ev))
2239 return current_ev;
2240
2241 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
2242 memset(&iwe, 0, sizeof(iwe));
2243 iwe.cmd = IWEVQUAL;
2244 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
2245 IW_QUAL_NOISE_INVALID |
2246 IW_QUAL_QUAL_UPDATED;
2247 switch (wiphy->signal_type) {
2248 case CFG80211_SIGNAL_TYPE_MBM:
2249 sig = bss->pub.signal / 100;
2250 iwe.u.qual.level = sig;
2251 iwe.u.qual.updated |= IW_QUAL_DBM;
2252 if (sig < -110)
2253 sig = -110;
2254 else if (sig > -40)
2255 sig = -40;
2256
2257 iwe.u.qual.qual = sig + 110;
2258 break;
2259 case CFG80211_SIGNAL_TYPE_UNSPEC:
2260 iwe.u.qual.level = bss->pub.signal;
2261
2262 iwe.u.qual.qual = bss->pub.signal;
2263 break;
2264 default:
2265
2266 break;
2267 }
2268 current_ev = iwe_stream_add_event_check(info, current_ev,
2269 end_buf, &iwe,
2270 IW_EV_QUAL_LEN);
2271 if (IS_ERR(current_ev))
2272 return current_ev;
2273 }
2274
2275 memset(&iwe, 0, sizeof(iwe));
2276 iwe.cmd = SIOCGIWENCODE;
2277 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
2278 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
2279 else
2280 iwe.u.data.flags = IW_ENCODE_DISABLED;
2281 iwe.u.data.length = 0;
2282 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
2283 &iwe, "");
2284 if (IS_ERR(current_ev))
2285 return current_ev;
2286
2287 rcu_read_lock();
2288 ies = rcu_dereference(bss->pub.ies);
2289 rem = ies->len;
2290 ie = ies->data;
2291
2292 while (rem >= 2) {
2293
2294 if (ie[1] > rem - 2)
2295 break;
2296
2297 switch (ie[0]) {
2298 case WLAN_EID_SSID:
2299 memset(&iwe, 0, sizeof(iwe));
2300 iwe.cmd = SIOCGIWESSID;
2301 iwe.u.data.length = ie[1];
2302 iwe.u.data.flags = 1;
2303 current_ev = iwe_stream_add_point_check(info,
2304 current_ev,
2305 end_buf, &iwe,
2306 (u8 *)ie + 2);
2307 if (IS_ERR(current_ev))
2308 goto unlock;
2309 break;
2310 case WLAN_EID_MESH_ID:
2311 memset(&iwe, 0, sizeof(iwe));
2312 iwe.cmd = SIOCGIWESSID;
2313 iwe.u.data.length = ie[1];
2314 iwe.u.data.flags = 1;
2315 current_ev = iwe_stream_add_point_check(info,
2316 current_ev,
2317 end_buf, &iwe,
2318 (u8 *)ie + 2);
2319 if (IS_ERR(current_ev))
2320 goto unlock;
2321 break;
2322 case WLAN_EID_MESH_CONFIG:
2323 ismesh = true;
2324 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
2325 break;
2326 cfg = (u8 *)ie + 2;
2327 memset(&iwe, 0, sizeof(iwe));
2328 iwe.cmd = IWEVCUSTOM;
2329 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
2330 "0x%02X", cfg[0]);
2331 iwe.u.data.length = strlen(buf);
2332 current_ev = iwe_stream_add_point_check(info,
2333 current_ev,
2334 end_buf,
2335 &iwe, buf);
2336 if (IS_ERR(current_ev))
2337 goto unlock;
2338 sprintf(buf, "Path Selection Metric ID: 0x%02X",
2339 cfg[1]);
2340 iwe.u.data.length = strlen(buf);
2341 current_ev = iwe_stream_add_point_check(info,
2342 current_ev,
2343 end_buf,
2344 &iwe, buf);
2345 if (IS_ERR(current_ev))
2346 goto unlock;
2347 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
2348 cfg[2]);
2349 iwe.u.data.length = strlen(buf);
2350 current_ev = iwe_stream_add_point_check(info,
2351 current_ev,
2352 end_buf,
2353 &iwe, buf);
2354 if (IS_ERR(current_ev))
2355 goto unlock;
2356 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
2357 iwe.u.data.length = strlen(buf);
2358 current_ev = iwe_stream_add_point_check(info,
2359 current_ev,
2360 end_buf,
2361 &iwe, buf);
2362 if (IS_ERR(current_ev))
2363 goto unlock;
2364 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
2365 iwe.u.data.length = strlen(buf);
2366 current_ev = iwe_stream_add_point_check(info,
2367 current_ev,
2368 end_buf,
2369 &iwe, buf);
2370 if (IS_ERR(current_ev))
2371 goto unlock;
2372 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
2373 iwe.u.data.length = strlen(buf);
2374 current_ev = iwe_stream_add_point_check(info,
2375 current_ev,
2376 end_buf,
2377 &iwe, buf);
2378 if (IS_ERR(current_ev))
2379 goto unlock;
2380 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
2381 iwe.u.data.length = strlen(buf);
2382 current_ev = iwe_stream_add_point_check(info,
2383 current_ev,
2384 end_buf,
2385 &iwe, buf);
2386 if (IS_ERR(current_ev))
2387 goto unlock;
2388 break;
2389 case WLAN_EID_SUPP_RATES:
2390 case WLAN_EID_EXT_SUPP_RATES:
2391
2392 p = current_ev + iwe_stream_lcp_len(info);
2393
2394 memset(&iwe, 0, sizeof(iwe));
2395 iwe.cmd = SIOCGIWRATE;
2396
2397 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
2398
2399 for (i = 0; i < ie[1]; i++) {
2400 iwe.u.bitrate.value =
2401 ((ie[i + 2] & 0x7f) * 500000);
2402 tmp = p;
2403 p = iwe_stream_add_value(info, current_ev, p,
2404 end_buf, &iwe,
2405 IW_EV_PARAM_LEN);
2406 if (p == tmp) {
2407 current_ev = ERR_PTR(-E2BIG);
2408 goto unlock;
2409 }
2410 }
2411 current_ev = p;
2412 break;
2413 }
2414 rem -= ie[1] + 2;
2415 ie += ie[1] + 2;
2416 }
2417
2418 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
2419 ismesh) {
2420 memset(&iwe, 0, sizeof(iwe));
2421 iwe.cmd = SIOCGIWMODE;
2422 if (ismesh)
2423 iwe.u.mode = IW_MODE_MESH;
2424 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
2425 iwe.u.mode = IW_MODE_MASTER;
2426 else
2427 iwe.u.mode = IW_MODE_ADHOC;
2428 current_ev = iwe_stream_add_event_check(info, current_ev,
2429 end_buf, &iwe,
2430 IW_EV_UINT_LEN);
2431 if (IS_ERR(current_ev))
2432 goto unlock;
2433 }
2434
2435 memset(&iwe, 0, sizeof(iwe));
2436 iwe.cmd = IWEVCUSTOM;
2437 sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
2438 iwe.u.data.length = strlen(buf);
2439 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
2440 &iwe, buf);
2441 if (IS_ERR(current_ev))
2442 goto unlock;
2443 memset(&iwe, 0, sizeof(iwe));
2444 iwe.cmd = IWEVCUSTOM;
2445 sprintf(buf, " Last beacon: %ums ago",
2446 elapsed_jiffies_msecs(bss->ts));
2447 iwe.u.data.length = strlen(buf);
2448 current_ev = iwe_stream_add_point_check(info, current_ev,
2449 end_buf, &iwe, buf);
2450 if (IS_ERR(current_ev))
2451 goto unlock;
2452
2453 current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
2454
2455 unlock:
2456 rcu_read_unlock();
2457 return current_ev;
2458}
2459
2460
2461static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
2462 struct iw_request_info *info,
2463 char *buf, size_t len)
2464{
2465 char *current_ev = buf;
2466 char *end_buf = buf + len;
2467 struct cfg80211_internal_bss *bss;
2468 int err = 0;
2469
2470 spin_lock_bh(&rdev->bss_lock);
2471 cfg80211_bss_expire(rdev);
2472
2473 list_for_each_entry(bss, &rdev->bss_list, list) {
2474 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
2475 err = -E2BIG;
2476 break;
2477 }
2478 current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
2479 current_ev, end_buf);
2480 if (IS_ERR(current_ev)) {
2481 err = PTR_ERR(current_ev);
2482 break;
2483 }
2484 }
2485 spin_unlock_bh(&rdev->bss_lock);
2486
2487 if (err)
2488 return err;
2489 return current_ev - buf;
2490}
2491
2492
2493int cfg80211_wext_giwscan(struct net_device *dev,
2494 struct iw_request_info *info,
2495 struct iw_point *data, char *extra)
2496{
2497 struct cfg80211_registered_device *rdev;
2498 int res;
2499
2500 if (!netif_running(dev))
2501 return -ENETDOWN;
2502
2503 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2504
2505 if (IS_ERR(rdev))
2506 return PTR_ERR(rdev);
2507
2508 if (rdev->scan_req || rdev->scan_msg)
2509 return -EAGAIN;
2510
2511 res = ieee80211_scan_results(rdev, info, extra, data->length);
2512 data->length = 0;
2513 if (res >= 0) {
2514 data->length = res;
2515 res = 0;
2516 }
2517
2518 return res;
2519}
2520EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan);
2521#endif
2522