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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
1095static struct cfg80211_internal_bss *
1096cfg80211_bss_update(struct cfg80211_registered_device *rdev,
1097 struct cfg80211_internal_bss *tmp,
1098 bool signal_valid)
1099{
1100 struct cfg80211_internal_bss *found = NULL;
1101
1102 if (WARN_ON(!tmp->pub.channel))
1103 return NULL;
1104
1105 tmp->ts = jiffies;
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 if (!res)
1430 return NULL;
1431
1432 if (channel->band == NL80211_BAND_60GHZ) {
1433 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1434 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1435 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1436 regulatory_hint_found_beacon(wiphy, channel, gfp);
1437 } else {
1438 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1439 regulatory_hint_found_beacon(wiphy, channel, gfp);
1440 }
1441
1442 if (non_tx_data && non_tx_data->tx_bss) {
1443
1444
1445
1446 if (cfg80211_add_nontrans_list(non_tx_data->tx_bss,
1447 &res->pub)) {
1448 if (__cfg80211_unlink_bss(rdev, res))
1449 rdev->bss_generation++;
1450 }
1451 }
1452
1453 trace_cfg80211_return_bss(&res->pub);
1454
1455 return &res->pub;
1456}
1457
1458static const struct element
1459*cfg80211_get_profile_continuation(const u8 *ie, size_t ielen,
1460 const struct element *mbssid_elem,
1461 const struct element *sub_elem)
1462{
1463 const u8 *mbssid_end = mbssid_elem->data + mbssid_elem->datalen;
1464 const struct element *next_mbssid;
1465 const struct element *next_sub;
1466
1467 next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID,
1468 mbssid_end,
1469 ielen - (mbssid_end - ie));
1470
1471
1472
1473
1474
1475 if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) ||
1476 !next_mbssid)
1477 return NULL;
1478
1479
1480
1481 if (next_mbssid->datalen < 4)
1482 return NULL;
1483
1484 next_sub = (void *)&next_mbssid->data[1];
1485
1486 if (next_mbssid->data + next_mbssid->datalen <
1487 next_sub->data + next_sub->datalen)
1488 return NULL;
1489
1490 if (next_sub->id != 0 || next_sub->datalen < 2)
1491 return NULL;
1492
1493
1494
1495
1496
1497 return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ?
1498 NULL : next_mbssid;
1499}
1500
1501size_t cfg80211_merge_profile(const u8 *ie, size_t ielen,
1502 const struct element *mbssid_elem,
1503 const struct element *sub_elem,
1504 u8 *merged_ie, size_t max_copy_len)
1505{
1506 size_t copied_len = sub_elem->datalen;
1507 const struct element *next_mbssid;
1508
1509 if (sub_elem->datalen > max_copy_len)
1510 return 0;
1511
1512 memcpy(merged_ie, sub_elem->data, sub_elem->datalen);
1513
1514 while ((next_mbssid = cfg80211_get_profile_continuation(ie, ielen,
1515 mbssid_elem,
1516 sub_elem))) {
1517 const struct element *next_sub = (void *)&next_mbssid->data[1];
1518
1519 if (copied_len + next_sub->datalen > max_copy_len)
1520 break;
1521 memcpy(merged_ie + copied_len, next_sub->data,
1522 next_sub->datalen);
1523 copied_len += next_sub->datalen;
1524 }
1525
1526 return copied_len;
1527}
1528EXPORT_SYMBOL(cfg80211_merge_profile);
1529
1530static void cfg80211_parse_mbssid_data(struct wiphy *wiphy,
1531 struct cfg80211_inform_bss *data,
1532 enum cfg80211_bss_frame_type ftype,
1533 const u8 *bssid, u64 tsf,
1534 u16 beacon_interval, const u8 *ie,
1535 size_t ielen,
1536 struct cfg80211_non_tx_bss *non_tx_data,
1537 gfp_t gfp)
1538{
1539 const u8 *mbssid_index_ie;
1540 const struct element *elem, *sub;
1541 size_t new_ie_len;
1542 u8 new_bssid[ETH_ALEN];
1543 u8 *new_ie, *profile;
1544 u64 seen_indices = 0;
1545 u16 capability;
1546 struct cfg80211_bss *bss;
1547
1548 if (!non_tx_data)
1549 return;
1550 if (!cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
1551 return;
1552 if (!wiphy->support_mbssid)
1553 return;
1554 if (wiphy->support_only_he_mbssid &&
1555 !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
1556 return;
1557
1558 new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp);
1559 if (!new_ie)
1560 return;
1561
1562 profile = kmalloc(ielen, gfp);
1563 if (!profile)
1564 goto out;
1565
1566 for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, ie, ielen) {
1567 if (elem->datalen < 4)
1568 continue;
1569 for_each_element(sub, elem->data + 1, elem->datalen - 1) {
1570 u8 profile_len;
1571
1572 if (sub->id != 0 || sub->datalen < 4) {
1573
1574 continue;
1575 }
1576
1577 if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP ||
1578 sub->data[1] != 2) {
1579
1580
1581
1582
1583 continue;
1584 }
1585
1586 memset(profile, 0, ielen);
1587 profile_len = cfg80211_merge_profile(ie, ielen,
1588 elem,
1589 sub,
1590 profile,
1591 ielen);
1592
1593
1594 mbssid_index_ie = cfg80211_find_ie
1595 (WLAN_EID_MULTI_BSSID_IDX,
1596 profile, profile_len);
1597 if (!mbssid_index_ie || mbssid_index_ie[1] < 1 ||
1598 mbssid_index_ie[2] == 0 ||
1599 mbssid_index_ie[2] > 46) {
1600
1601 continue;
1602 }
1603
1604 if (seen_indices & BIT_ULL(mbssid_index_ie[2]))
1605
1606 net_dbg_ratelimited("Partial info for BSSID index %d\n",
1607 mbssid_index_ie[2]);
1608
1609 seen_indices |= BIT_ULL(mbssid_index_ie[2]);
1610
1611 non_tx_data->bssid_index = mbssid_index_ie[2];
1612 non_tx_data->max_bssid_indicator = elem->data[0];
1613
1614 cfg80211_gen_new_bssid(bssid,
1615 non_tx_data->max_bssid_indicator,
1616 non_tx_data->bssid_index,
1617 new_bssid);
1618 memset(new_ie, 0, IEEE80211_MAX_DATA_LEN);
1619 new_ie_len = cfg80211_gen_new_ie(ie, ielen,
1620 profile,
1621 profile_len, new_ie,
1622 gfp);
1623 if (!new_ie_len)
1624 continue;
1625
1626 capability = get_unaligned_le16(profile + 2);
1627 bss = cfg80211_inform_single_bss_data(wiphy, data,
1628 ftype,
1629 new_bssid, tsf,
1630 capability,
1631 beacon_interval,
1632 new_ie,
1633 new_ie_len,
1634 non_tx_data,
1635 gfp);
1636 if (!bss)
1637 break;
1638 cfg80211_put_bss(wiphy, bss);
1639 }
1640 }
1641
1642out:
1643 kfree(new_ie);
1644 kfree(profile);
1645}
1646
1647struct cfg80211_bss *
1648cfg80211_inform_bss_data(struct wiphy *wiphy,
1649 struct cfg80211_inform_bss *data,
1650 enum cfg80211_bss_frame_type ftype,
1651 const u8 *bssid, u64 tsf, u16 capability,
1652 u16 beacon_interval, const u8 *ie, size_t ielen,
1653 gfp_t gfp)
1654{
1655 struct cfg80211_bss *res;
1656 struct cfg80211_non_tx_bss non_tx_data;
1657
1658 res = cfg80211_inform_single_bss_data(wiphy, data, ftype, bssid, tsf,
1659 capability, beacon_interval, ie,
1660 ielen, NULL, gfp);
1661 non_tx_data.tx_bss = res;
1662 cfg80211_parse_mbssid_data(wiphy, data, ftype, bssid, tsf,
1663 beacon_interval, ie, ielen, &non_tx_data,
1664 gfp);
1665 return res;
1666}
1667EXPORT_SYMBOL(cfg80211_inform_bss_data);
1668
1669static void
1670cfg80211_parse_mbssid_frame_data(struct wiphy *wiphy,
1671 struct cfg80211_inform_bss *data,
1672 struct ieee80211_mgmt *mgmt, size_t len,
1673 struct cfg80211_non_tx_bss *non_tx_data,
1674 gfp_t gfp)
1675{
1676 enum cfg80211_bss_frame_type ftype;
1677 const u8 *ie = mgmt->u.probe_resp.variable;
1678 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1679 u.probe_resp.variable);
1680
1681 ftype = ieee80211_is_beacon(mgmt->frame_control) ?
1682 CFG80211_BSS_FTYPE_BEACON : CFG80211_BSS_FTYPE_PRESP;
1683
1684 cfg80211_parse_mbssid_data(wiphy, data, ftype, mgmt->bssid,
1685 le64_to_cpu(mgmt->u.probe_resp.timestamp),
1686 le16_to_cpu(mgmt->u.probe_resp.beacon_int),
1687 ie, ielen, non_tx_data, gfp);
1688}
1689
1690static void
1691cfg80211_update_notlisted_nontrans(struct wiphy *wiphy,
1692 struct cfg80211_bss *nontrans_bss,
1693 struct ieee80211_mgmt *mgmt, size_t len,
1694 gfp_t gfp)
1695{
1696 u8 *ie, *new_ie, *pos;
1697 const u8 *nontrans_ssid, *trans_ssid, *mbssid;
1698 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1699 u.probe_resp.variable);
1700 size_t new_ie_len;
1701 struct cfg80211_bss_ies *new_ies;
1702 const struct cfg80211_bss_ies *old;
1703 u8 cpy_len;
1704
1705 ie = mgmt->u.probe_resp.variable;
1706
1707 new_ie_len = ielen;
1708 trans_ssid = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
1709 if (!trans_ssid)
1710 return;
1711 new_ie_len -= trans_ssid[1];
1712 mbssid = cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen);
1713 if (!mbssid)
1714 return;
1715 new_ie_len -= mbssid[1];
1716 rcu_read_lock();
1717 nontrans_ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
1718 if (!nontrans_ssid) {
1719 rcu_read_unlock();
1720 return;
1721 }
1722 new_ie_len += nontrans_ssid[1];
1723 rcu_read_unlock();
1724
1725
1726
1727
1728
1729 new_ie = kzalloc(new_ie_len, gfp);
1730 if (!new_ie)
1731 return;
1732 new_ies = kzalloc(sizeof(*new_ies) + new_ie_len, gfp);
1733 if (!new_ies)
1734 goto out_free;
1735
1736 pos = new_ie;
1737
1738
1739 cpy_len = nontrans_ssid[1] + 2;
1740 memcpy(pos, nontrans_ssid, cpy_len);
1741 pos += cpy_len;
1742
1743 cpy_len = trans_ssid[1] + 2;
1744 memcpy(pos, (trans_ssid + cpy_len), (mbssid - (trans_ssid + cpy_len)));
1745 pos += (mbssid - (trans_ssid + cpy_len));
1746
1747 cpy_len = mbssid[1] + 2;
1748 memcpy(pos, mbssid + cpy_len, ((ie + ielen) - (mbssid + cpy_len)));
1749
1750
1751 new_ies->len = new_ie_len;
1752 new_ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
1753 new_ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
1754 memcpy(new_ies->data, new_ie, new_ie_len);
1755 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
1756 old = rcu_access_pointer(nontrans_bss->proberesp_ies);
1757 rcu_assign_pointer(nontrans_bss->proberesp_ies, new_ies);
1758 rcu_assign_pointer(nontrans_bss->ies, new_ies);
1759 if (old)
1760 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1761 } else {
1762 old = rcu_access_pointer(nontrans_bss->beacon_ies);
1763 rcu_assign_pointer(nontrans_bss->beacon_ies, new_ies);
1764 rcu_assign_pointer(nontrans_bss->ies, new_ies);
1765 if (old)
1766 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1767 }
1768
1769out_free:
1770 kfree(new_ie);
1771}
1772
1773
1774static struct cfg80211_bss *
1775cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
1776 struct cfg80211_inform_bss *data,
1777 struct ieee80211_mgmt *mgmt, size_t len,
1778 struct cfg80211_non_tx_bss *non_tx_data,
1779 gfp_t gfp)
1780{
1781 struct cfg80211_internal_bss tmp = {}, *res;
1782 struct cfg80211_bss_ies *ies;
1783 struct ieee80211_channel *channel;
1784 bool signal_valid;
1785 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1786 u.probe_resp.variable);
1787 int bss_type;
1788
1789 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
1790 offsetof(struct ieee80211_mgmt, u.beacon.variable));
1791
1792 trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len);
1793
1794 if (WARN_ON(!mgmt))
1795 return NULL;
1796
1797 if (WARN_ON(!wiphy))
1798 return NULL;
1799
1800 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
1801 (data->signal < 0 || data->signal > 100)))
1802 return NULL;
1803
1804 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
1805 return NULL;
1806
1807 channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable,
1808 ielen, data->chan, data->scan_width);
1809 if (!channel)
1810 return NULL;
1811
1812 ies = kzalloc(sizeof(*ies) + ielen, gfp);
1813 if (!ies)
1814 return NULL;
1815 ies->len = ielen;
1816 ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
1817 ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
1818 memcpy(ies->data, mgmt->u.probe_resp.variable, ielen);
1819
1820 if (ieee80211_is_probe_resp(mgmt->frame_control))
1821 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1822 else
1823 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1824 rcu_assign_pointer(tmp.pub.ies, ies);
1825
1826 memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN);
1827 tmp.pub.channel = channel;
1828 tmp.pub.scan_width = data->scan_width;
1829 tmp.pub.signal = data->signal;
1830 tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
1831 tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
1832 tmp.ts_boottime = data->boottime_ns;
1833 tmp.parent_tsf = data->parent_tsf;
1834 tmp.pub.chains = data->chains;
1835 memcpy(tmp.pub.chain_signal, data->chain_signal, IEEE80211_MAX_CHAINS);
1836 ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
1837 if (non_tx_data) {
1838 tmp.pub.transmitted_bss = non_tx_data->tx_bss;
1839 tmp.pub.bssid_index = non_tx_data->bssid_index;
1840 tmp.pub.max_bssid_indicator = non_tx_data->max_bssid_indicator;
1841 }
1842
1843 signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
1844 wiphy->max_adj_channel_rssi_comp;
1845 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
1846 if (!res)
1847 return NULL;
1848
1849 if (channel->band == NL80211_BAND_60GHZ) {
1850 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1851 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1852 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1853 regulatory_hint_found_beacon(wiphy, channel, gfp);
1854 } else {
1855 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1856 regulatory_hint_found_beacon(wiphy, channel, gfp);
1857 }
1858
1859 trace_cfg80211_return_bss(&res->pub);
1860
1861 return &res->pub;
1862}
1863
1864struct cfg80211_bss *
1865cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
1866 struct cfg80211_inform_bss *data,
1867 struct ieee80211_mgmt *mgmt, size_t len,
1868 gfp_t gfp)
1869{
1870 struct cfg80211_bss *res, *tmp_bss;
1871 const u8 *ie = mgmt->u.probe_resp.variable;
1872 const struct cfg80211_bss_ies *ies1, *ies2;
1873 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1874 u.probe_resp.variable);
1875 struct cfg80211_non_tx_bss non_tx_data;
1876
1877 res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt,
1878 len, NULL, gfp);
1879 if (!res || !wiphy->support_mbssid ||
1880 !cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
1881 return res;
1882 if (wiphy->support_only_he_mbssid &&
1883 !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
1884 return res;
1885
1886 non_tx_data.tx_bss = res;
1887
1888 cfg80211_parse_mbssid_frame_data(wiphy, data, mgmt, len,
1889 &non_tx_data, gfp);
1890
1891
1892
1893
1894 ies1 = rcu_access_pointer(res->ies);
1895
1896
1897
1898
1899
1900 list_for_each_entry(tmp_bss, &res->nontrans_list,
1901 nontrans_list) {
1902 ies2 = rcu_access_pointer(tmp_bss->ies);
1903 if (ies2->tsf < ies1->tsf)
1904 cfg80211_update_notlisted_nontrans(wiphy, tmp_bss,
1905 mgmt, len, gfp);
1906 }
1907
1908 return res;
1909}
1910EXPORT_SYMBOL(cfg80211_inform_bss_frame_data);
1911
1912void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1913{
1914 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1915 struct cfg80211_internal_bss *bss;
1916
1917 if (!pub)
1918 return;
1919
1920 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1921
1922 spin_lock_bh(&rdev->bss_lock);
1923 bss_ref_get(rdev, bss);
1924 spin_unlock_bh(&rdev->bss_lock);
1925}
1926EXPORT_SYMBOL(cfg80211_ref_bss);
1927
1928void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1929{
1930 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1931 struct cfg80211_internal_bss *bss;
1932
1933 if (!pub)
1934 return;
1935
1936 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1937
1938 spin_lock_bh(&rdev->bss_lock);
1939 bss_ref_put(rdev, bss);
1940 spin_unlock_bh(&rdev->bss_lock);
1941}
1942EXPORT_SYMBOL(cfg80211_put_bss);
1943
1944void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1945{
1946 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1947 struct cfg80211_internal_bss *bss, *tmp1;
1948 struct cfg80211_bss *nontrans_bss, *tmp;
1949
1950 if (WARN_ON(!pub))
1951 return;
1952
1953 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1954
1955 spin_lock_bh(&rdev->bss_lock);
1956 if (list_empty(&bss->list))
1957 goto out;
1958
1959 list_for_each_entry_safe(nontrans_bss, tmp,
1960 &pub->nontrans_list,
1961 nontrans_list) {
1962 tmp1 = container_of(nontrans_bss,
1963 struct cfg80211_internal_bss, pub);
1964 if (__cfg80211_unlink_bss(rdev, tmp1))
1965 rdev->bss_generation++;
1966 }
1967
1968 if (__cfg80211_unlink_bss(rdev, bss))
1969 rdev->bss_generation++;
1970out:
1971 spin_unlock_bh(&rdev->bss_lock);
1972}
1973EXPORT_SYMBOL(cfg80211_unlink_bss);
1974
1975#ifdef CONFIG_CFG80211_WEXT
1976static struct cfg80211_registered_device *
1977cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
1978{
1979 struct cfg80211_registered_device *rdev;
1980 struct net_device *dev;
1981
1982 ASSERT_RTNL();
1983
1984 dev = dev_get_by_index(net, ifindex);
1985 if (!dev)
1986 return ERR_PTR(-ENODEV);
1987 if (dev->ieee80211_ptr)
1988 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
1989 else
1990 rdev = ERR_PTR(-ENODEV);
1991 dev_put(dev);
1992 return rdev;
1993}
1994
1995int cfg80211_wext_siwscan(struct net_device *dev,
1996 struct iw_request_info *info,
1997 union iwreq_data *wrqu, char *extra)
1998{
1999 struct cfg80211_registered_device *rdev;
2000 struct wiphy *wiphy;
2001 struct iw_scan_req *wreq = NULL;
2002 struct cfg80211_scan_request *creq = NULL;
2003 int i, err, n_channels = 0;
2004 enum nl80211_band band;
2005
2006 if (!netif_running(dev))
2007 return -ENETDOWN;
2008
2009 if (wrqu->data.length == sizeof(struct iw_scan_req))
2010 wreq = (struct iw_scan_req *)extra;
2011
2012 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2013
2014 if (IS_ERR(rdev))
2015 return PTR_ERR(rdev);
2016
2017 if (rdev->scan_req || rdev->scan_msg) {
2018 err = -EBUSY;
2019 goto out;
2020 }
2021
2022 wiphy = &rdev->wiphy;
2023
2024
2025 if (wreq && wreq->num_channels)
2026 n_channels = wreq->num_channels;
2027 else
2028 n_channels = ieee80211_get_num_supported_channels(wiphy);
2029
2030 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
2031 n_channels * sizeof(void *),
2032 GFP_ATOMIC);
2033 if (!creq) {
2034 err = -ENOMEM;
2035 goto out;
2036 }
2037
2038 creq->wiphy = wiphy;
2039 creq->wdev = dev->ieee80211_ptr;
2040
2041 creq->ssids = (void *)&creq->channels[n_channels];
2042 creq->n_channels = n_channels;
2043 creq->n_ssids = 1;
2044 creq->scan_start = jiffies;
2045
2046
2047 i = 0;
2048 for (band = 0; band < NUM_NL80211_BANDS; band++) {
2049 int j;
2050
2051 if (!wiphy->bands[band])
2052 continue;
2053
2054 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
2055
2056 if (wiphy->bands[band]->channels[j].flags &
2057 IEEE80211_CHAN_DISABLED)
2058 continue;
2059
2060
2061
2062
2063
2064 if (wreq && wreq->num_channels) {
2065 int k;
2066 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
2067 for (k = 0; k < wreq->num_channels; k++) {
2068 struct iw_freq *freq =
2069 &wreq->channel_list[k];
2070 int wext_freq =
2071 cfg80211_wext_freq(freq);
2072
2073 if (wext_freq == wiphy_freq)
2074 goto wext_freq_found;
2075 }
2076 goto wext_freq_not_found;
2077 }
2078
2079 wext_freq_found:
2080 creq->channels[i] = &wiphy->bands[band]->channels[j];
2081 i++;
2082 wext_freq_not_found: ;
2083 }
2084 }
2085
2086 if (!i) {
2087 err = -EINVAL;
2088 goto out;
2089 }
2090
2091
2092 creq->n_channels = i;
2093
2094
2095 if (wreq) {
2096 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
2097 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
2098 err = -EINVAL;
2099 goto out;
2100 }
2101 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
2102 creq->ssids[0].ssid_len = wreq->essid_len;
2103 }
2104 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
2105 creq->n_ssids = 0;
2106 }
2107
2108 for (i = 0; i < NUM_NL80211_BANDS; i++)
2109 if (wiphy->bands[i])
2110 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
2111
2112 eth_broadcast_addr(creq->bssid);
2113
2114 rdev->scan_req = creq;
2115 err = rdev_scan(rdev, creq);
2116 if (err) {
2117 rdev->scan_req = NULL;
2118
2119 } else {
2120 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
2121
2122 creq = NULL;
2123 dev_hold(dev);
2124 }
2125 out:
2126 kfree(creq);
2127 return err;
2128}
2129EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
2130
2131static char *ieee80211_scan_add_ies(struct iw_request_info *info,
2132 const struct cfg80211_bss_ies *ies,
2133 char *current_ev, char *end_buf)
2134{
2135 const u8 *pos, *end, *next;
2136 struct iw_event iwe;
2137
2138 if (!ies)
2139 return current_ev;
2140
2141
2142
2143
2144
2145 pos = ies->data;
2146 end = pos + ies->len;
2147
2148 while (end - pos > IW_GENERIC_IE_MAX) {
2149 next = pos + 2 + pos[1];
2150 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
2151 next = next + 2 + next[1];
2152
2153 memset(&iwe, 0, sizeof(iwe));
2154 iwe.cmd = IWEVGENIE;
2155 iwe.u.data.length = next - pos;
2156 current_ev = iwe_stream_add_point_check(info, current_ev,
2157 end_buf, &iwe,
2158 (void *)pos);
2159 if (IS_ERR(current_ev))
2160 return current_ev;
2161 pos = next;
2162 }
2163
2164 if (end > pos) {
2165 memset(&iwe, 0, sizeof(iwe));
2166 iwe.cmd = IWEVGENIE;
2167 iwe.u.data.length = end - pos;
2168 current_ev = iwe_stream_add_point_check(info, current_ev,
2169 end_buf, &iwe,
2170 (void *)pos);
2171 if (IS_ERR(current_ev))
2172 return current_ev;
2173 }
2174
2175 return current_ev;
2176}
2177
2178static char *
2179ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
2180 struct cfg80211_internal_bss *bss, char *current_ev,
2181 char *end_buf)
2182{
2183 const struct cfg80211_bss_ies *ies;
2184 struct iw_event iwe;
2185 const u8 *ie;
2186 u8 buf[50];
2187 u8 *cfg, *p, *tmp;
2188 int rem, i, sig;
2189 bool ismesh = false;
2190
2191 memset(&iwe, 0, sizeof(iwe));
2192 iwe.cmd = SIOCGIWAP;
2193 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
2194 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
2195 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2196 IW_EV_ADDR_LEN);
2197 if (IS_ERR(current_ev))
2198 return current_ev;
2199
2200 memset(&iwe, 0, sizeof(iwe));
2201 iwe.cmd = SIOCGIWFREQ;
2202 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
2203 iwe.u.freq.e = 0;
2204 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2205 IW_EV_FREQ_LEN);
2206 if (IS_ERR(current_ev))
2207 return current_ev;
2208
2209 memset(&iwe, 0, sizeof(iwe));
2210 iwe.cmd = SIOCGIWFREQ;
2211 iwe.u.freq.m = bss->pub.channel->center_freq;
2212 iwe.u.freq.e = 6;
2213 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2214 IW_EV_FREQ_LEN);
2215 if (IS_ERR(current_ev))
2216 return current_ev;
2217
2218 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
2219 memset(&iwe, 0, sizeof(iwe));
2220 iwe.cmd = IWEVQUAL;
2221 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
2222 IW_QUAL_NOISE_INVALID |
2223 IW_QUAL_QUAL_UPDATED;
2224 switch (wiphy->signal_type) {
2225 case CFG80211_SIGNAL_TYPE_MBM:
2226 sig = bss->pub.signal / 100;
2227 iwe.u.qual.level = sig;
2228 iwe.u.qual.updated |= IW_QUAL_DBM;
2229 if (sig < -110)
2230 sig = -110;
2231 else if (sig > -40)
2232 sig = -40;
2233
2234 iwe.u.qual.qual = sig + 110;
2235 break;
2236 case CFG80211_SIGNAL_TYPE_UNSPEC:
2237 iwe.u.qual.level = bss->pub.signal;
2238
2239 iwe.u.qual.qual = bss->pub.signal;
2240 break;
2241 default:
2242
2243 break;
2244 }
2245 current_ev = iwe_stream_add_event_check(info, current_ev,
2246 end_buf, &iwe,
2247 IW_EV_QUAL_LEN);
2248 if (IS_ERR(current_ev))
2249 return current_ev;
2250 }
2251
2252 memset(&iwe, 0, sizeof(iwe));
2253 iwe.cmd = SIOCGIWENCODE;
2254 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
2255 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
2256 else
2257 iwe.u.data.flags = IW_ENCODE_DISABLED;
2258 iwe.u.data.length = 0;
2259 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
2260 &iwe, "");
2261 if (IS_ERR(current_ev))
2262 return current_ev;
2263
2264 rcu_read_lock();
2265 ies = rcu_dereference(bss->pub.ies);
2266 rem = ies->len;
2267 ie = ies->data;
2268
2269 while (rem >= 2) {
2270
2271 if (ie[1] > rem - 2)
2272 break;
2273
2274 switch (ie[0]) {
2275 case WLAN_EID_SSID:
2276 memset(&iwe, 0, sizeof(iwe));
2277 iwe.cmd = SIOCGIWESSID;
2278 iwe.u.data.length = ie[1];
2279 iwe.u.data.flags = 1;
2280 current_ev = iwe_stream_add_point_check(info,
2281 current_ev,
2282 end_buf, &iwe,
2283 (u8 *)ie + 2);
2284 if (IS_ERR(current_ev))
2285 goto unlock;
2286 break;
2287 case WLAN_EID_MESH_ID:
2288 memset(&iwe, 0, sizeof(iwe));
2289 iwe.cmd = SIOCGIWESSID;
2290 iwe.u.data.length = ie[1];
2291 iwe.u.data.flags = 1;
2292 current_ev = iwe_stream_add_point_check(info,
2293 current_ev,
2294 end_buf, &iwe,
2295 (u8 *)ie + 2);
2296 if (IS_ERR(current_ev))
2297 goto unlock;
2298 break;
2299 case WLAN_EID_MESH_CONFIG:
2300 ismesh = true;
2301 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
2302 break;
2303 cfg = (u8 *)ie + 2;
2304 memset(&iwe, 0, sizeof(iwe));
2305 iwe.cmd = IWEVCUSTOM;
2306 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
2307 "0x%02X", cfg[0]);
2308 iwe.u.data.length = strlen(buf);
2309 current_ev = iwe_stream_add_point_check(info,
2310 current_ev,
2311 end_buf,
2312 &iwe, buf);
2313 if (IS_ERR(current_ev))
2314 goto unlock;
2315 sprintf(buf, "Path Selection Metric ID: 0x%02X",
2316 cfg[1]);
2317 iwe.u.data.length = strlen(buf);
2318 current_ev = iwe_stream_add_point_check(info,
2319 current_ev,
2320 end_buf,
2321 &iwe, buf);
2322 if (IS_ERR(current_ev))
2323 goto unlock;
2324 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
2325 cfg[2]);
2326 iwe.u.data.length = strlen(buf);
2327 current_ev = iwe_stream_add_point_check(info,
2328 current_ev,
2329 end_buf,
2330 &iwe, buf);
2331 if (IS_ERR(current_ev))
2332 goto unlock;
2333 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
2334 iwe.u.data.length = strlen(buf);
2335 current_ev = iwe_stream_add_point_check(info,
2336 current_ev,
2337 end_buf,
2338 &iwe, buf);
2339 if (IS_ERR(current_ev))
2340 goto unlock;
2341 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
2342 iwe.u.data.length = strlen(buf);
2343 current_ev = iwe_stream_add_point_check(info,
2344 current_ev,
2345 end_buf,
2346 &iwe, buf);
2347 if (IS_ERR(current_ev))
2348 goto unlock;
2349 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
2350 iwe.u.data.length = strlen(buf);
2351 current_ev = iwe_stream_add_point_check(info,
2352 current_ev,
2353 end_buf,
2354 &iwe, buf);
2355 if (IS_ERR(current_ev))
2356 goto unlock;
2357 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
2358 iwe.u.data.length = strlen(buf);
2359 current_ev = iwe_stream_add_point_check(info,
2360 current_ev,
2361 end_buf,
2362 &iwe, buf);
2363 if (IS_ERR(current_ev))
2364 goto unlock;
2365 break;
2366 case WLAN_EID_SUPP_RATES:
2367 case WLAN_EID_EXT_SUPP_RATES:
2368
2369 p = current_ev + iwe_stream_lcp_len(info);
2370
2371 memset(&iwe, 0, sizeof(iwe));
2372 iwe.cmd = SIOCGIWRATE;
2373
2374 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
2375
2376 for (i = 0; i < ie[1]; i++) {
2377 iwe.u.bitrate.value =
2378 ((ie[i + 2] & 0x7f) * 500000);
2379 tmp = p;
2380 p = iwe_stream_add_value(info, current_ev, p,
2381 end_buf, &iwe,
2382 IW_EV_PARAM_LEN);
2383 if (p == tmp) {
2384 current_ev = ERR_PTR(-E2BIG);
2385 goto unlock;
2386 }
2387 }
2388 current_ev = p;
2389 break;
2390 }
2391 rem -= ie[1] + 2;
2392 ie += ie[1] + 2;
2393 }
2394
2395 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
2396 ismesh) {
2397 memset(&iwe, 0, sizeof(iwe));
2398 iwe.cmd = SIOCGIWMODE;
2399 if (ismesh)
2400 iwe.u.mode = IW_MODE_MESH;
2401 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
2402 iwe.u.mode = IW_MODE_MASTER;
2403 else
2404 iwe.u.mode = IW_MODE_ADHOC;
2405 current_ev = iwe_stream_add_event_check(info, current_ev,
2406 end_buf, &iwe,
2407 IW_EV_UINT_LEN);
2408 if (IS_ERR(current_ev))
2409 goto unlock;
2410 }
2411
2412 memset(&iwe, 0, sizeof(iwe));
2413 iwe.cmd = IWEVCUSTOM;
2414 sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
2415 iwe.u.data.length = strlen(buf);
2416 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
2417 &iwe, buf);
2418 if (IS_ERR(current_ev))
2419 goto unlock;
2420 memset(&iwe, 0, sizeof(iwe));
2421 iwe.cmd = IWEVCUSTOM;
2422 sprintf(buf, " Last beacon: %ums ago",
2423 elapsed_jiffies_msecs(bss->ts));
2424 iwe.u.data.length = strlen(buf);
2425 current_ev = iwe_stream_add_point_check(info, current_ev,
2426 end_buf, &iwe, buf);
2427 if (IS_ERR(current_ev))
2428 goto unlock;
2429
2430 current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
2431
2432 unlock:
2433 rcu_read_unlock();
2434 return current_ev;
2435}
2436
2437
2438static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
2439 struct iw_request_info *info,
2440 char *buf, size_t len)
2441{
2442 char *current_ev = buf;
2443 char *end_buf = buf + len;
2444 struct cfg80211_internal_bss *bss;
2445 int err = 0;
2446
2447 spin_lock_bh(&rdev->bss_lock);
2448 cfg80211_bss_expire(rdev);
2449
2450 list_for_each_entry(bss, &rdev->bss_list, list) {
2451 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
2452 err = -E2BIG;
2453 break;
2454 }
2455 current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
2456 current_ev, end_buf);
2457 if (IS_ERR(current_ev)) {
2458 err = PTR_ERR(current_ev);
2459 break;
2460 }
2461 }
2462 spin_unlock_bh(&rdev->bss_lock);
2463
2464 if (err)
2465 return err;
2466 return current_ev - buf;
2467}
2468
2469
2470int cfg80211_wext_giwscan(struct net_device *dev,
2471 struct iw_request_info *info,
2472 struct iw_point *data, char *extra)
2473{
2474 struct cfg80211_registered_device *rdev;
2475 int res;
2476
2477 if (!netif_running(dev))
2478 return -ENETDOWN;
2479
2480 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2481
2482 if (IS_ERR(rdev))
2483 return PTR_ERR(rdev);
2484
2485 if (rdev->scan_req || rdev->scan_msg)
2486 return -EAGAIN;
2487
2488 res = ieee80211_scan_results(rdev, info, extra, data->length);
2489 data->length = 0;
2490 if (res >= 0) {
2491 data->length = res;
2492 res = 0;
2493 }
2494
2495 return res;
2496}
2497EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan);
2498#endif
2499