This source file includes following definitions.
- bss_free
- bss_ref_get
- bss_ref_put
- __cfg80211_unlink_bss
- cfg80211_is_element_inherited
- cfg80211_gen_new_ie
- is_bss
- cfg80211_add_nontrans_list
- __cfg80211_bss_expire
- cfg80211_bss_expire_oldest
- ___cfg80211_scan_done
- __cfg80211_scan_done
- cfg80211_scan_done
- cfg80211_add_sched_scan_req
- cfg80211_del_sched_scan_req
- cfg80211_find_sched_scan_req
- cfg80211_sched_scan_req_possible
- cfg80211_sched_scan_results_wk
- cfg80211_sched_scan_results
- cfg80211_sched_scan_stopped_rtnl
- cfg80211_sched_scan_stopped
- cfg80211_stop_sched_scan_req
- __cfg80211_stop_sched_scan
- cfg80211_bss_age
- cfg80211_bss_expire
- cfg80211_find_elem_match
- cfg80211_find_vendor_elem
- cmp_bss
- cfg80211_bss_type_match
- cfg80211_get_bss
- rb_insert_bss
- rb_find_bss
- cfg80211_combine_bsses
- cfg80211_update_known_bss
- cfg80211_bss_update
- cfg80211_get_bss_channel
- cfg80211_inform_single_bss_data
- cfg80211_get_profile_continuation
- cfg80211_merge_profile
- cfg80211_parse_mbssid_data
- cfg80211_inform_bss_data
- cfg80211_parse_mbssid_frame_data
- cfg80211_update_notlisted_nontrans
- cfg80211_inform_single_bss_frame_data
- cfg80211_inform_bss_frame_data
- cfg80211_ref_bss
- cfg80211_put_bss
- cfg80211_unlink_bss
- cfg80211_bss_iter
- cfg80211_update_assoc_bss_entry
- cfg80211_get_dev_from_ifindex
- cfg80211_wext_siwscan
- ieee80211_scan_add_ies
- ieee80211_bss
- ieee80211_scan_results
- cfg80211_wext_giwscan
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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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70 static int bss_entries_limit = 1000;
71 module_param(bss_entries_limit, int, 0644);
72 MODULE_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
77 static 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
101 static 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
121 static 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
152 static 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
182 bool 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
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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 }
230 EXPORT_SYMBOL(cfg80211_is_element_inherited);
231
232 static 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
343 static 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
366 static int
367 cfg80211_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
395 static 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
417 static 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
451 void ___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
513 void __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
525 void 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 }
535 EXPORT_SYMBOL(cfg80211_scan_done);
536
537 void 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
545 static 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
554 static struct cfg80211_sched_scan_request *
555 cfg80211_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
576 int 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
601 void 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
627 void 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 }
643 EXPORT_SYMBOL(cfg80211_sched_scan_results);
644
645 void 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 }
655 EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl);
656
657 void 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 }
663 EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
664
665 int 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
684 int __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
699 void 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
711 void cfg80211_bss_expire(struct cfg80211_registered_device *rdev)
712 {
713 __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
714 }
715
716 const struct element *
717 cfg80211_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 }
731 EXPORT_SYMBOL(cfg80211_find_elem_match);
732
733 const 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 }
752 EXPORT_SYMBOL(cfg80211_find_vendor_elem);
753
754
755
756
757
758
759
760 enum bss_compare_mode {
761 BSS_CMP_REGULAR,
762 BSS_CMP_HIDE_ZLEN,
763 BSS_CMP_HIDE_NUL,
764 };
765
766 static 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
866 static 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
913 struct 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 }
960 EXPORT_SYMBOL(cfg80211_get_bss);
961
962 static 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
991 static struct cfg80211_internal_bss *
992 rb_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
1015 static 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
1088 struct cfg80211_non_tx_bss {
1089 struct cfg80211_bss *tx_bss;
1090 u8 max_bssid_indicator;
1091 u8 bssid_index;
1092 };
1093
1094 static bool
1095 cfg80211_update_known_bss(struct cfg80211_registered_device *rdev,
1096 struct cfg80211_internal_bss *known,
1097 struct cfg80211_internal_bss *new,
1098 bool signal_valid)
1099 {
1100 lockdep_assert_held(&rdev->bss_lock);
1101
1102
1103 if (rcu_access_pointer(new->pub.proberesp_ies)) {
1104 const struct cfg80211_bss_ies *old;
1105
1106 old = rcu_access_pointer(known->pub.proberesp_ies);
1107
1108 rcu_assign_pointer(known->pub.proberesp_ies,
1109 new->pub.proberesp_ies);
1110
1111 rcu_assign_pointer(known->pub.ies,
1112 new->pub.proberesp_ies);
1113 if (old)
1114 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1115 } else if (rcu_access_pointer(new->pub.beacon_ies)) {
1116 const struct cfg80211_bss_ies *old;
1117 struct cfg80211_internal_bss *bss;
1118
1119 if (known->pub.hidden_beacon_bss &&
1120 !list_empty(&known->hidden_list)) {
1121 const struct cfg80211_bss_ies *f;
1122
1123
1124
1125
1126
1127
1128
1129
1130
1131
1132 f = rcu_access_pointer(new->pub.beacon_ies);
1133 kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head);
1134 return false;
1135 }
1136
1137 old = rcu_access_pointer(known->pub.beacon_ies);
1138
1139 rcu_assign_pointer(known->pub.beacon_ies, new->pub.beacon_ies);
1140
1141
1142 if (old == rcu_access_pointer(known->pub.ies))
1143 rcu_assign_pointer(known->pub.ies, new->pub.beacon_ies);
1144
1145
1146 list_for_each_entry(bss, &known->hidden_list, hidden_list) {
1147 const struct cfg80211_bss_ies *ies;
1148
1149 ies = rcu_access_pointer(bss->pub.beacon_ies);
1150 WARN_ON(ies != old);
1151
1152 rcu_assign_pointer(bss->pub.beacon_ies,
1153 new->pub.beacon_ies);
1154 }
1155
1156 if (old)
1157 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1158 }
1159
1160 known->pub.beacon_interval = new->pub.beacon_interval;
1161
1162
1163
1164
1165 if (signal_valid)
1166 known->pub.signal = new->pub.signal;
1167 known->pub.capability = new->pub.capability;
1168 known->ts = new->ts;
1169 known->ts_boottime = new->ts_boottime;
1170 known->parent_tsf = new->parent_tsf;
1171 known->pub.chains = new->pub.chains;
1172 memcpy(known->pub.chain_signal, new->pub.chain_signal,
1173 IEEE80211_MAX_CHAINS);
1174 ether_addr_copy(known->parent_bssid, new->parent_bssid);
1175 known->pub.max_bssid_indicator = new->pub.max_bssid_indicator;
1176 known->pub.bssid_index = new->pub.bssid_index;
1177
1178 return true;
1179 }
1180
1181
1182 struct cfg80211_internal_bss *
1183 cfg80211_bss_update(struct cfg80211_registered_device *rdev,
1184 struct cfg80211_internal_bss *tmp,
1185 bool signal_valid, unsigned long ts)
1186 {
1187 struct cfg80211_internal_bss *found = NULL;
1188
1189 if (WARN_ON(!tmp->pub.channel))
1190 return NULL;
1191
1192 tmp->ts = ts;
1193
1194 spin_lock_bh(&rdev->bss_lock);
1195
1196 if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
1197 spin_unlock_bh(&rdev->bss_lock);
1198 return NULL;
1199 }
1200
1201 found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR);
1202
1203 if (found) {
1204 if (!cfg80211_update_known_bss(rdev, found, tmp, signal_valid))
1205 goto drop;
1206 } else {
1207 struct cfg80211_internal_bss *new;
1208 struct cfg80211_internal_bss *hidden;
1209 struct cfg80211_bss_ies *ies;
1210
1211
1212
1213
1214
1215
1216 new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size,
1217 GFP_ATOMIC);
1218 if (!new) {
1219 ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
1220 if (ies)
1221 kfree_rcu(ies, rcu_head);
1222 ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
1223 if (ies)
1224 kfree_rcu(ies, rcu_head);
1225 goto drop;
1226 }
1227 memcpy(new, tmp, sizeof(*new));
1228 new->refcount = 1;
1229 INIT_LIST_HEAD(&new->hidden_list);
1230 INIT_LIST_HEAD(&new->pub.nontrans_list);
1231
1232 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
1233 hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
1234 if (!hidden)
1235 hidden = rb_find_bss(rdev, tmp,
1236 BSS_CMP_HIDE_NUL);
1237 if (hidden) {
1238 new->pub.hidden_beacon_bss = &hidden->pub;
1239 list_add(&new->hidden_list,
1240 &hidden->hidden_list);
1241 hidden->refcount++;
1242 rcu_assign_pointer(new->pub.beacon_ies,
1243 hidden->pub.beacon_ies);
1244 }
1245 } else {
1246
1247
1248
1249
1250
1251
1252 if (!cfg80211_combine_bsses(rdev, new)) {
1253 kfree(new);
1254 goto drop;
1255 }
1256 }
1257
1258 if (rdev->bss_entries >= bss_entries_limit &&
1259 !cfg80211_bss_expire_oldest(rdev)) {
1260 kfree(new);
1261 goto drop;
1262 }
1263
1264
1265 if (tmp->pub.transmitted_bss) {
1266 struct cfg80211_internal_bss *pbss =
1267 container_of(tmp->pub.transmitted_bss,
1268 struct cfg80211_internal_bss,
1269 pub);
1270
1271 new->pub.transmitted_bss = tmp->pub.transmitted_bss;
1272 bss_ref_get(rdev, pbss);
1273 }
1274
1275 list_add_tail(&new->list, &rdev->bss_list);
1276 rdev->bss_entries++;
1277 rb_insert_bss(rdev, new);
1278 found = new;
1279 }
1280
1281 rdev->bss_generation++;
1282 bss_ref_get(rdev, found);
1283 spin_unlock_bh(&rdev->bss_lock);
1284
1285 return found;
1286 drop:
1287 spin_unlock_bh(&rdev->bss_lock);
1288 return NULL;
1289 }
1290
1291
1292
1293
1294
1295
1296
1297
1298
1299 static struct ieee80211_channel *
1300 cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
1301 struct ieee80211_channel *channel,
1302 enum nl80211_bss_scan_width scan_width)
1303 {
1304 const u8 *tmp;
1305 u32 freq;
1306 int channel_number = -1;
1307 struct ieee80211_channel *alt_channel;
1308
1309 tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen);
1310 if (tmp && tmp[1] == 1) {
1311 channel_number = tmp[2];
1312 } else {
1313 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen);
1314 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) {
1315 struct ieee80211_ht_operation *htop = (void *)(tmp + 2);
1316
1317 channel_number = htop->primary_chan;
1318 }
1319 }
1320
1321 if (channel_number < 0) {
1322
1323 return channel;
1324 }
1325
1326 freq = ieee80211_channel_to_frequency(channel_number, channel->band);
1327 alt_channel = ieee80211_get_channel(wiphy, freq);
1328 if (!alt_channel) {
1329 if (channel->band == NL80211_BAND_2GHZ) {
1330
1331
1332
1333
1334
1335
1336 return NULL;
1337 }
1338
1339
1340 return channel;
1341 }
1342
1343 if (scan_width == NL80211_BSS_CHAN_WIDTH_10 ||
1344 scan_width == NL80211_BSS_CHAN_WIDTH_5) {
1345
1346
1347
1348
1349
1350 return channel;
1351 }
1352
1353
1354
1355
1356
1357 if (alt_channel->flags & IEEE80211_CHAN_DISABLED)
1358 return NULL;
1359 return alt_channel;
1360 }
1361
1362
1363 static struct cfg80211_bss *
1364 cfg80211_inform_single_bss_data(struct wiphy *wiphy,
1365 struct cfg80211_inform_bss *data,
1366 enum cfg80211_bss_frame_type ftype,
1367 const u8 *bssid, u64 tsf, u16 capability,
1368 u16 beacon_interval, const u8 *ie, size_t ielen,
1369 struct cfg80211_non_tx_bss *non_tx_data,
1370 gfp_t gfp)
1371 {
1372 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1373 struct cfg80211_bss_ies *ies;
1374 struct ieee80211_channel *channel;
1375 struct cfg80211_internal_bss tmp = {}, *res;
1376 int bss_type;
1377 bool signal_valid;
1378 unsigned long ts;
1379
1380 if (WARN_ON(!wiphy))
1381 return NULL;
1382
1383 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
1384 (data->signal < 0 || data->signal > 100)))
1385 return NULL;
1386
1387 channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan,
1388 data->scan_width);
1389 if (!channel)
1390 return NULL;
1391
1392 memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
1393 tmp.pub.channel = channel;
1394 tmp.pub.scan_width = data->scan_width;
1395 tmp.pub.signal = data->signal;
1396 tmp.pub.beacon_interval = beacon_interval;
1397 tmp.pub.capability = capability;
1398 tmp.ts_boottime = data->boottime_ns;
1399 if (non_tx_data) {
1400 tmp.pub.transmitted_bss = non_tx_data->tx_bss;
1401 ts = bss_from_pub(non_tx_data->tx_bss)->ts;
1402 tmp.pub.bssid_index = non_tx_data->bssid_index;
1403 tmp.pub.max_bssid_indicator = non_tx_data->max_bssid_indicator;
1404 } else {
1405 ts = jiffies;
1406 }
1407
1408
1409
1410
1411
1412
1413
1414
1415
1416 ies = kzalloc(sizeof(*ies) + ielen, gfp);
1417 if (!ies)
1418 return NULL;
1419 ies->len = ielen;
1420 ies->tsf = tsf;
1421 ies->from_beacon = false;
1422 memcpy(ies->data, ie, ielen);
1423
1424 switch (ftype) {
1425 case CFG80211_BSS_FTYPE_BEACON:
1426 ies->from_beacon = true;
1427
1428 case CFG80211_BSS_FTYPE_UNKNOWN:
1429 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1430 break;
1431 case CFG80211_BSS_FTYPE_PRESP:
1432 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1433 break;
1434 }
1435 rcu_assign_pointer(tmp.pub.ies, ies);
1436
1437 signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
1438 wiphy->max_adj_channel_rssi_comp;
1439 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid, ts);
1440 if (!res)
1441 return NULL;
1442
1443 if (channel->band == NL80211_BAND_60GHZ) {
1444 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1445 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1446 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1447 regulatory_hint_found_beacon(wiphy, channel, gfp);
1448 } else {
1449 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1450 regulatory_hint_found_beacon(wiphy, channel, gfp);
1451 }
1452
1453 if (non_tx_data) {
1454
1455
1456
1457 if (cfg80211_add_nontrans_list(non_tx_data->tx_bss,
1458 &res->pub)) {
1459 if (__cfg80211_unlink_bss(rdev, res))
1460 rdev->bss_generation++;
1461 }
1462 }
1463
1464 trace_cfg80211_return_bss(&res->pub);
1465
1466 return &res->pub;
1467 }
1468
1469 static const struct element
1470 *cfg80211_get_profile_continuation(const u8 *ie, size_t ielen,
1471 const struct element *mbssid_elem,
1472 const struct element *sub_elem)
1473 {
1474 const u8 *mbssid_end = mbssid_elem->data + mbssid_elem->datalen;
1475 const struct element *next_mbssid;
1476 const struct element *next_sub;
1477
1478 next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID,
1479 mbssid_end,
1480 ielen - (mbssid_end - ie));
1481
1482
1483
1484
1485
1486 if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) ||
1487 !next_mbssid)
1488 return NULL;
1489
1490
1491
1492 if (next_mbssid->datalen < 4)
1493 return NULL;
1494
1495 next_sub = (void *)&next_mbssid->data[1];
1496
1497 if (next_mbssid->data + next_mbssid->datalen <
1498 next_sub->data + next_sub->datalen)
1499 return NULL;
1500
1501 if (next_sub->id != 0 || next_sub->datalen < 2)
1502 return NULL;
1503
1504
1505
1506
1507
1508 return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ?
1509 NULL : next_mbssid;
1510 }
1511
1512 size_t cfg80211_merge_profile(const u8 *ie, size_t ielen,
1513 const struct element *mbssid_elem,
1514 const struct element *sub_elem,
1515 u8 *merged_ie, size_t max_copy_len)
1516 {
1517 size_t copied_len = sub_elem->datalen;
1518 const struct element *next_mbssid;
1519
1520 if (sub_elem->datalen > max_copy_len)
1521 return 0;
1522
1523 memcpy(merged_ie, sub_elem->data, sub_elem->datalen);
1524
1525 while ((next_mbssid = cfg80211_get_profile_continuation(ie, ielen,
1526 mbssid_elem,
1527 sub_elem))) {
1528 const struct element *next_sub = (void *)&next_mbssid->data[1];
1529
1530 if (copied_len + next_sub->datalen > max_copy_len)
1531 break;
1532 memcpy(merged_ie + copied_len, next_sub->data,
1533 next_sub->datalen);
1534 copied_len += next_sub->datalen;
1535 }
1536
1537 return copied_len;
1538 }
1539 EXPORT_SYMBOL(cfg80211_merge_profile);
1540
1541 static void cfg80211_parse_mbssid_data(struct wiphy *wiphy,
1542 struct cfg80211_inform_bss *data,
1543 enum cfg80211_bss_frame_type ftype,
1544 const u8 *bssid, u64 tsf,
1545 u16 beacon_interval, const u8 *ie,
1546 size_t ielen,
1547 struct cfg80211_non_tx_bss *non_tx_data,
1548 gfp_t gfp)
1549 {
1550 const u8 *mbssid_index_ie;
1551 const struct element *elem, *sub;
1552 size_t new_ie_len;
1553 u8 new_bssid[ETH_ALEN];
1554 u8 *new_ie, *profile;
1555 u64 seen_indices = 0;
1556 u16 capability;
1557 struct cfg80211_bss *bss;
1558
1559 if (!non_tx_data)
1560 return;
1561 if (!cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
1562 return;
1563 if (!wiphy->support_mbssid)
1564 return;
1565 if (wiphy->support_only_he_mbssid &&
1566 !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
1567 return;
1568
1569 new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp);
1570 if (!new_ie)
1571 return;
1572
1573 profile = kmalloc(ielen, gfp);
1574 if (!profile)
1575 goto out;
1576
1577 for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, ie, ielen) {
1578 if (elem->datalen < 4)
1579 continue;
1580 for_each_element(sub, elem->data + 1, elem->datalen - 1) {
1581 u8 profile_len;
1582
1583 if (sub->id != 0 || sub->datalen < 4) {
1584
1585 continue;
1586 }
1587
1588 if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP ||
1589 sub->data[1] != 2) {
1590
1591
1592
1593
1594 continue;
1595 }
1596
1597 memset(profile, 0, ielen);
1598 profile_len = cfg80211_merge_profile(ie, ielen,
1599 elem,
1600 sub,
1601 profile,
1602 ielen);
1603
1604
1605 mbssid_index_ie = cfg80211_find_ie
1606 (WLAN_EID_MULTI_BSSID_IDX,
1607 profile, profile_len);
1608 if (!mbssid_index_ie || mbssid_index_ie[1] < 1 ||
1609 mbssid_index_ie[2] == 0 ||
1610 mbssid_index_ie[2] > 46) {
1611
1612 continue;
1613 }
1614
1615 if (seen_indices & BIT_ULL(mbssid_index_ie[2]))
1616
1617 net_dbg_ratelimited("Partial info for BSSID index %d\n",
1618 mbssid_index_ie[2]);
1619
1620 seen_indices |= BIT_ULL(mbssid_index_ie[2]);
1621
1622 non_tx_data->bssid_index = mbssid_index_ie[2];
1623 non_tx_data->max_bssid_indicator = elem->data[0];
1624
1625 cfg80211_gen_new_bssid(bssid,
1626 non_tx_data->max_bssid_indicator,
1627 non_tx_data->bssid_index,
1628 new_bssid);
1629 memset(new_ie, 0, IEEE80211_MAX_DATA_LEN);
1630 new_ie_len = cfg80211_gen_new_ie(ie, ielen,
1631 profile,
1632 profile_len, new_ie,
1633 gfp);
1634 if (!new_ie_len)
1635 continue;
1636
1637 capability = get_unaligned_le16(profile + 2);
1638 bss = cfg80211_inform_single_bss_data(wiphy, data,
1639 ftype,
1640 new_bssid, tsf,
1641 capability,
1642 beacon_interval,
1643 new_ie,
1644 new_ie_len,
1645 non_tx_data,
1646 gfp);
1647 if (!bss)
1648 break;
1649 cfg80211_put_bss(wiphy, bss);
1650 }
1651 }
1652
1653 out:
1654 kfree(new_ie);
1655 kfree(profile);
1656 }
1657
1658 struct cfg80211_bss *
1659 cfg80211_inform_bss_data(struct wiphy *wiphy,
1660 struct cfg80211_inform_bss *data,
1661 enum cfg80211_bss_frame_type ftype,
1662 const u8 *bssid, u64 tsf, u16 capability,
1663 u16 beacon_interval, const u8 *ie, size_t ielen,
1664 gfp_t gfp)
1665 {
1666 struct cfg80211_bss *res;
1667 struct cfg80211_non_tx_bss non_tx_data;
1668
1669 res = cfg80211_inform_single_bss_data(wiphy, data, ftype, bssid, tsf,
1670 capability, beacon_interval, ie,
1671 ielen, NULL, gfp);
1672 if (!res)
1673 return NULL;
1674 non_tx_data.tx_bss = res;
1675 cfg80211_parse_mbssid_data(wiphy, data, ftype, bssid, tsf,
1676 beacon_interval, ie, ielen, &non_tx_data,
1677 gfp);
1678 return res;
1679 }
1680 EXPORT_SYMBOL(cfg80211_inform_bss_data);
1681
1682 static void
1683 cfg80211_parse_mbssid_frame_data(struct wiphy *wiphy,
1684 struct cfg80211_inform_bss *data,
1685 struct ieee80211_mgmt *mgmt, size_t len,
1686 struct cfg80211_non_tx_bss *non_tx_data,
1687 gfp_t gfp)
1688 {
1689 enum cfg80211_bss_frame_type ftype;
1690 const u8 *ie = mgmt->u.probe_resp.variable;
1691 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1692 u.probe_resp.variable);
1693
1694 ftype = ieee80211_is_beacon(mgmt->frame_control) ?
1695 CFG80211_BSS_FTYPE_BEACON : CFG80211_BSS_FTYPE_PRESP;
1696
1697 cfg80211_parse_mbssid_data(wiphy, data, ftype, mgmt->bssid,
1698 le64_to_cpu(mgmt->u.probe_resp.timestamp),
1699 le16_to_cpu(mgmt->u.probe_resp.beacon_int),
1700 ie, ielen, non_tx_data, gfp);
1701 }
1702
1703 static void
1704 cfg80211_update_notlisted_nontrans(struct wiphy *wiphy,
1705 struct cfg80211_bss *nontrans_bss,
1706 struct ieee80211_mgmt *mgmt, size_t len)
1707 {
1708 u8 *ie, *new_ie, *pos;
1709 const u8 *nontrans_ssid, *trans_ssid, *mbssid;
1710 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1711 u.probe_resp.variable);
1712 size_t new_ie_len;
1713 struct cfg80211_bss_ies *new_ies;
1714 const struct cfg80211_bss_ies *old;
1715 u8 cpy_len;
1716
1717 lockdep_assert_held(&wiphy_to_rdev(wiphy)->bss_lock);
1718
1719 ie = mgmt->u.probe_resp.variable;
1720
1721 new_ie_len = ielen;
1722 trans_ssid = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
1723 if (!trans_ssid)
1724 return;
1725 new_ie_len -= trans_ssid[1];
1726 mbssid = cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen);
1727
1728
1729
1730
1731
1732 if (!mbssid || mbssid < trans_ssid)
1733 return;
1734 new_ie_len -= mbssid[1];
1735
1736 nontrans_ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
1737 if (!nontrans_ssid)
1738 return;
1739
1740 new_ie_len += nontrans_ssid[1];
1741
1742
1743
1744
1745
1746 new_ie = kzalloc(new_ie_len, GFP_ATOMIC);
1747 if (!new_ie)
1748 return;
1749
1750 new_ies = kzalloc(sizeof(*new_ies) + new_ie_len, GFP_ATOMIC);
1751 if (!new_ies)
1752 goto out_free;
1753
1754 pos = new_ie;
1755
1756
1757 cpy_len = nontrans_ssid[1] + 2;
1758 memcpy(pos, nontrans_ssid, cpy_len);
1759 pos += cpy_len;
1760
1761 cpy_len = trans_ssid[1] + 2;
1762 memcpy(pos, (trans_ssid + cpy_len), (mbssid - (trans_ssid + cpy_len)));
1763 pos += (mbssid - (trans_ssid + cpy_len));
1764
1765 cpy_len = mbssid[1] + 2;
1766 memcpy(pos, mbssid + cpy_len, ((ie + ielen) - (mbssid + cpy_len)));
1767
1768
1769 new_ies->len = new_ie_len;
1770 new_ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
1771 new_ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
1772 memcpy(new_ies->data, new_ie, new_ie_len);
1773 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
1774 old = rcu_access_pointer(nontrans_bss->proberesp_ies);
1775 rcu_assign_pointer(nontrans_bss->proberesp_ies, new_ies);
1776 rcu_assign_pointer(nontrans_bss->ies, new_ies);
1777 if (old)
1778 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1779 } else {
1780 old = rcu_access_pointer(nontrans_bss->beacon_ies);
1781 rcu_assign_pointer(nontrans_bss->beacon_ies, new_ies);
1782 rcu_assign_pointer(nontrans_bss->ies, new_ies);
1783 if (old)
1784 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1785 }
1786
1787 out_free:
1788 kfree(new_ie);
1789 }
1790
1791
1792 static struct cfg80211_bss *
1793 cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
1794 struct cfg80211_inform_bss *data,
1795 struct ieee80211_mgmt *mgmt, size_t len,
1796 gfp_t gfp)
1797 {
1798 struct cfg80211_internal_bss tmp = {}, *res;
1799 struct cfg80211_bss_ies *ies;
1800 struct ieee80211_channel *channel;
1801 bool signal_valid;
1802 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1803 u.probe_resp.variable);
1804 int bss_type;
1805
1806 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
1807 offsetof(struct ieee80211_mgmt, u.beacon.variable));
1808
1809 trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len);
1810
1811 if (WARN_ON(!mgmt))
1812 return NULL;
1813
1814 if (WARN_ON(!wiphy))
1815 return NULL;
1816
1817 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
1818 (data->signal < 0 || data->signal > 100)))
1819 return NULL;
1820
1821 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
1822 return NULL;
1823
1824 channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable,
1825 ielen, data->chan, data->scan_width);
1826 if (!channel)
1827 return NULL;
1828
1829 ies = kzalloc(sizeof(*ies) + ielen, gfp);
1830 if (!ies)
1831 return NULL;
1832 ies->len = ielen;
1833 ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
1834 ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
1835 memcpy(ies->data, mgmt->u.probe_resp.variable, ielen);
1836
1837 if (ieee80211_is_probe_resp(mgmt->frame_control))
1838 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1839 else
1840 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1841 rcu_assign_pointer(tmp.pub.ies, ies);
1842
1843 memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN);
1844 tmp.pub.channel = channel;
1845 tmp.pub.scan_width = data->scan_width;
1846 tmp.pub.signal = data->signal;
1847 tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
1848 tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
1849 tmp.ts_boottime = data->boottime_ns;
1850 tmp.parent_tsf = data->parent_tsf;
1851 tmp.pub.chains = data->chains;
1852 memcpy(tmp.pub.chain_signal, data->chain_signal, IEEE80211_MAX_CHAINS);
1853 ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
1854
1855 signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
1856 wiphy->max_adj_channel_rssi_comp;
1857 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid,
1858 jiffies);
1859 if (!res)
1860 return NULL;
1861
1862 if (channel->band == NL80211_BAND_60GHZ) {
1863 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1864 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1865 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1866 regulatory_hint_found_beacon(wiphy, channel, gfp);
1867 } else {
1868 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1869 regulatory_hint_found_beacon(wiphy, channel, gfp);
1870 }
1871
1872 trace_cfg80211_return_bss(&res->pub);
1873
1874 return &res->pub;
1875 }
1876
1877 struct cfg80211_bss *
1878 cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
1879 struct cfg80211_inform_bss *data,
1880 struct ieee80211_mgmt *mgmt, size_t len,
1881 gfp_t gfp)
1882 {
1883 struct cfg80211_bss *res, *tmp_bss;
1884 const u8 *ie = mgmt->u.probe_resp.variable;
1885 const struct cfg80211_bss_ies *ies1, *ies2;
1886 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1887 u.probe_resp.variable);
1888 struct cfg80211_non_tx_bss non_tx_data;
1889
1890 res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt,
1891 len, gfp);
1892 if (!res || !wiphy->support_mbssid ||
1893 !cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
1894 return res;
1895 if (wiphy->support_only_he_mbssid &&
1896 !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
1897 return res;
1898
1899 non_tx_data.tx_bss = res;
1900
1901 cfg80211_parse_mbssid_frame_data(wiphy, data, mgmt, len,
1902 &non_tx_data, gfp);
1903
1904 spin_lock_bh(&wiphy_to_rdev(wiphy)->bss_lock);
1905
1906
1907
1908
1909 ies1 = rcu_access_pointer(res->ies);
1910
1911
1912
1913
1914
1915 list_for_each_entry(tmp_bss, &res->nontrans_list,
1916 nontrans_list) {
1917 ies2 = rcu_access_pointer(tmp_bss->ies);
1918 if (ies2->tsf < ies1->tsf)
1919 cfg80211_update_notlisted_nontrans(wiphy, tmp_bss,
1920 mgmt, len);
1921 }
1922 spin_unlock_bh(&wiphy_to_rdev(wiphy)->bss_lock);
1923
1924 return res;
1925 }
1926 EXPORT_SYMBOL(cfg80211_inform_bss_frame_data);
1927
1928 void cfg80211_ref_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_get(rdev, bss);
1940 spin_unlock_bh(&rdev->bss_lock);
1941 }
1942 EXPORT_SYMBOL(cfg80211_ref_bss);
1943
1944 void cfg80211_put_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;
1948
1949 if (!pub)
1950 return;
1951
1952 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1953
1954 spin_lock_bh(&rdev->bss_lock);
1955 bss_ref_put(rdev, bss);
1956 spin_unlock_bh(&rdev->bss_lock);
1957 }
1958 EXPORT_SYMBOL(cfg80211_put_bss);
1959
1960 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1961 {
1962 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1963 struct cfg80211_internal_bss *bss, *tmp1;
1964 struct cfg80211_bss *nontrans_bss, *tmp;
1965
1966 if (WARN_ON(!pub))
1967 return;
1968
1969 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1970
1971 spin_lock_bh(&rdev->bss_lock);
1972 if (list_empty(&bss->list))
1973 goto out;
1974
1975 list_for_each_entry_safe(nontrans_bss, tmp,
1976 &pub->nontrans_list,
1977 nontrans_list) {
1978 tmp1 = container_of(nontrans_bss,
1979 struct cfg80211_internal_bss, pub);
1980 if (__cfg80211_unlink_bss(rdev, tmp1))
1981 rdev->bss_generation++;
1982 }
1983
1984 if (__cfg80211_unlink_bss(rdev, bss))
1985 rdev->bss_generation++;
1986 out:
1987 spin_unlock_bh(&rdev->bss_lock);
1988 }
1989 EXPORT_SYMBOL(cfg80211_unlink_bss);
1990
1991 void cfg80211_bss_iter(struct wiphy *wiphy,
1992 struct cfg80211_chan_def *chandef,
1993 void (*iter)(struct wiphy *wiphy,
1994 struct cfg80211_bss *bss,
1995 void *data),
1996 void *iter_data)
1997 {
1998 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1999 struct cfg80211_internal_bss *bss;
2000
2001 spin_lock_bh(&rdev->bss_lock);
2002
2003 list_for_each_entry(bss, &rdev->bss_list, list) {
2004 if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel))
2005 iter(wiphy, &bss->pub, iter_data);
2006 }
2007
2008 spin_unlock_bh(&rdev->bss_lock);
2009 }
2010 EXPORT_SYMBOL(cfg80211_bss_iter);
2011
2012 void cfg80211_update_assoc_bss_entry(struct wireless_dev *wdev,
2013 struct ieee80211_channel *chan)
2014 {
2015 struct wiphy *wiphy = wdev->wiphy;
2016 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2017 struct cfg80211_internal_bss *cbss = wdev->current_bss;
2018 struct cfg80211_internal_bss *new = NULL;
2019 struct cfg80211_internal_bss *bss;
2020 struct cfg80211_bss *nontrans_bss;
2021 struct cfg80211_bss *tmp;
2022
2023 spin_lock_bh(&rdev->bss_lock);
2024
2025
2026
2027
2028
2029 if (cbss->pub.channel == chan)
2030 goto done;
2031
2032
2033 if (cbss->pub.transmitted_bss)
2034 cbss = container_of(cbss->pub.transmitted_bss,
2035 struct cfg80211_internal_bss,
2036 pub);
2037
2038 cbss->pub.channel = chan;
2039
2040 list_for_each_entry(bss, &rdev->bss_list, list) {
2041 if (!cfg80211_bss_type_match(bss->pub.capability,
2042 bss->pub.channel->band,
2043 wdev->conn_bss_type))
2044 continue;
2045
2046 if (bss == cbss)
2047 continue;
2048
2049 if (!cmp_bss(&bss->pub, &cbss->pub, BSS_CMP_REGULAR)) {
2050 new = bss;
2051 break;
2052 }
2053 }
2054
2055 if (new) {
2056
2057 if (cfg80211_update_known_bss(rdev, cbss, new, false)) {
2058 new->pub.proberesp_ies = NULL;
2059 new->pub.beacon_ies = NULL;
2060 }
2061
2062 list_for_each_entry_safe(nontrans_bss, tmp,
2063 &new->pub.nontrans_list,
2064 nontrans_list) {
2065 bss = container_of(nontrans_bss,
2066 struct cfg80211_internal_bss, pub);
2067 if (__cfg80211_unlink_bss(rdev, bss))
2068 rdev->bss_generation++;
2069 }
2070
2071 WARN_ON(atomic_read(&new->hold));
2072 if (!WARN_ON(!__cfg80211_unlink_bss(rdev, new)))
2073 rdev->bss_generation++;
2074 }
2075
2076 rb_erase(&cbss->rbn, &rdev->bss_tree);
2077 rb_insert_bss(rdev, cbss);
2078 rdev->bss_generation++;
2079
2080 list_for_each_entry_safe(nontrans_bss, tmp,
2081 &cbss->pub.nontrans_list,
2082 nontrans_list) {
2083 bss = container_of(nontrans_bss,
2084 struct cfg80211_internal_bss, pub);
2085 bss->pub.channel = chan;
2086 rb_erase(&bss->rbn, &rdev->bss_tree);
2087 rb_insert_bss(rdev, bss);
2088 rdev->bss_generation++;
2089 }
2090
2091 done:
2092 spin_unlock_bh(&rdev->bss_lock);
2093 }
2094
2095 #ifdef CONFIG_CFG80211_WEXT
2096 static struct cfg80211_registered_device *
2097 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
2098 {
2099 struct cfg80211_registered_device *rdev;
2100 struct net_device *dev;
2101
2102 ASSERT_RTNL();
2103
2104 dev = dev_get_by_index(net, ifindex);
2105 if (!dev)
2106 return ERR_PTR(-ENODEV);
2107 if (dev->ieee80211_ptr)
2108 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
2109 else
2110 rdev = ERR_PTR(-ENODEV);
2111 dev_put(dev);
2112 return rdev;
2113 }
2114
2115 int cfg80211_wext_siwscan(struct net_device *dev,
2116 struct iw_request_info *info,
2117 union iwreq_data *wrqu, char *extra)
2118 {
2119 struct cfg80211_registered_device *rdev;
2120 struct wiphy *wiphy;
2121 struct iw_scan_req *wreq = NULL;
2122 struct cfg80211_scan_request *creq = NULL;
2123 int i, err, n_channels = 0;
2124 enum nl80211_band band;
2125
2126 if (!netif_running(dev))
2127 return -ENETDOWN;
2128
2129 if (wrqu->data.length == sizeof(struct iw_scan_req))
2130 wreq = (struct iw_scan_req *)extra;
2131
2132 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2133
2134 if (IS_ERR(rdev))
2135 return PTR_ERR(rdev);
2136
2137 if (rdev->scan_req || rdev->scan_msg) {
2138 err = -EBUSY;
2139 goto out;
2140 }
2141
2142 wiphy = &rdev->wiphy;
2143
2144
2145 if (wreq && wreq->num_channels)
2146 n_channels = wreq->num_channels;
2147 else
2148 n_channels = ieee80211_get_num_supported_channels(wiphy);
2149
2150 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
2151 n_channels * sizeof(void *),
2152 GFP_ATOMIC);
2153 if (!creq) {
2154 err = -ENOMEM;
2155 goto out;
2156 }
2157
2158 creq->wiphy = wiphy;
2159 creq->wdev = dev->ieee80211_ptr;
2160
2161 creq->ssids = (void *)&creq->channels[n_channels];
2162 creq->n_channels = n_channels;
2163 creq->n_ssids = 1;
2164 creq->scan_start = jiffies;
2165
2166
2167 i = 0;
2168 for (band = 0; band < NUM_NL80211_BANDS; band++) {
2169 int j;
2170
2171 if (!wiphy->bands[band])
2172 continue;
2173
2174 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
2175
2176 if (wiphy->bands[band]->channels[j].flags &
2177 IEEE80211_CHAN_DISABLED)
2178 continue;
2179
2180
2181
2182
2183
2184 if (wreq && wreq->num_channels) {
2185 int k;
2186 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
2187 for (k = 0; k < wreq->num_channels; k++) {
2188 struct iw_freq *freq =
2189 &wreq->channel_list[k];
2190 int wext_freq =
2191 cfg80211_wext_freq(freq);
2192
2193 if (wext_freq == wiphy_freq)
2194 goto wext_freq_found;
2195 }
2196 goto wext_freq_not_found;
2197 }
2198
2199 wext_freq_found:
2200 creq->channels[i] = &wiphy->bands[band]->channels[j];
2201 i++;
2202 wext_freq_not_found: ;
2203 }
2204 }
2205
2206 if (!i) {
2207 err = -EINVAL;
2208 goto out;
2209 }
2210
2211
2212 creq->n_channels = i;
2213
2214
2215 if (wreq) {
2216 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
2217 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
2218 err = -EINVAL;
2219 goto out;
2220 }
2221 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
2222 creq->ssids[0].ssid_len = wreq->essid_len;
2223 }
2224 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
2225 creq->n_ssids = 0;
2226 }
2227
2228 for (i = 0; i < NUM_NL80211_BANDS; i++)
2229 if (wiphy->bands[i])
2230 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
2231
2232 eth_broadcast_addr(creq->bssid);
2233
2234 rdev->scan_req = creq;
2235 err = rdev_scan(rdev, creq);
2236 if (err) {
2237 rdev->scan_req = NULL;
2238
2239 } else {
2240 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
2241
2242 creq = NULL;
2243 dev_hold(dev);
2244 }
2245 out:
2246 kfree(creq);
2247 return err;
2248 }
2249 EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
2250
2251 static char *ieee80211_scan_add_ies(struct iw_request_info *info,
2252 const struct cfg80211_bss_ies *ies,
2253 char *current_ev, char *end_buf)
2254 {
2255 const u8 *pos, *end, *next;
2256 struct iw_event iwe;
2257
2258 if (!ies)
2259 return current_ev;
2260
2261
2262
2263
2264
2265 pos = ies->data;
2266 end = pos + ies->len;
2267
2268 while (end - pos > IW_GENERIC_IE_MAX) {
2269 next = pos + 2 + pos[1];
2270 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
2271 next = next + 2 + next[1];
2272
2273 memset(&iwe, 0, sizeof(iwe));
2274 iwe.cmd = IWEVGENIE;
2275 iwe.u.data.length = next - pos;
2276 current_ev = iwe_stream_add_point_check(info, current_ev,
2277 end_buf, &iwe,
2278 (void *)pos);
2279 if (IS_ERR(current_ev))
2280 return current_ev;
2281 pos = next;
2282 }
2283
2284 if (end > pos) {
2285 memset(&iwe, 0, sizeof(iwe));
2286 iwe.cmd = IWEVGENIE;
2287 iwe.u.data.length = end - pos;
2288 current_ev = iwe_stream_add_point_check(info, current_ev,
2289 end_buf, &iwe,
2290 (void *)pos);
2291 if (IS_ERR(current_ev))
2292 return current_ev;
2293 }
2294
2295 return current_ev;
2296 }
2297
2298 static char *
2299 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
2300 struct cfg80211_internal_bss *bss, char *current_ev,
2301 char *end_buf)
2302 {
2303 const struct cfg80211_bss_ies *ies;
2304 struct iw_event iwe;
2305 const u8 *ie;
2306 u8 buf[50];
2307 u8 *cfg, *p, *tmp;
2308 int rem, i, sig;
2309 bool ismesh = false;
2310
2311 memset(&iwe, 0, sizeof(iwe));
2312 iwe.cmd = SIOCGIWAP;
2313 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
2314 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
2315 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2316 IW_EV_ADDR_LEN);
2317 if (IS_ERR(current_ev))
2318 return current_ev;
2319
2320 memset(&iwe, 0, sizeof(iwe));
2321 iwe.cmd = SIOCGIWFREQ;
2322 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
2323 iwe.u.freq.e = 0;
2324 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2325 IW_EV_FREQ_LEN);
2326 if (IS_ERR(current_ev))
2327 return current_ev;
2328
2329 memset(&iwe, 0, sizeof(iwe));
2330 iwe.cmd = SIOCGIWFREQ;
2331 iwe.u.freq.m = bss->pub.channel->center_freq;
2332 iwe.u.freq.e = 6;
2333 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2334 IW_EV_FREQ_LEN);
2335 if (IS_ERR(current_ev))
2336 return current_ev;
2337
2338 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
2339 memset(&iwe, 0, sizeof(iwe));
2340 iwe.cmd = IWEVQUAL;
2341 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
2342 IW_QUAL_NOISE_INVALID |
2343 IW_QUAL_QUAL_UPDATED;
2344 switch (wiphy->signal_type) {
2345 case CFG80211_SIGNAL_TYPE_MBM:
2346 sig = bss->pub.signal / 100;
2347 iwe.u.qual.level = sig;
2348 iwe.u.qual.updated |= IW_QUAL_DBM;
2349 if (sig < -110)
2350 sig = -110;
2351 else if (sig > -40)
2352 sig = -40;
2353
2354 iwe.u.qual.qual = sig + 110;
2355 break;
2356 case CFG80211_SIGNAL_TYPE_UNSPEC:
2357 iwe.u.qual.level = bss->pub.signal;
2358
2359 iwe.u.qual.qual = bss->pub.signal;
2360 break;
2361 default:
2362
2363 break;
2364 }
2365 current_ev = iwe_stream_add_event_check(info, current_ev,
2366 end_buf, &iwe,
2367 IW_EV_QUAL_LEN);
2368 if (IS_ERR(current_ev))
2369 return current_ev;
2370 }
2371
2372 memset(&iwe, 0, sizeof(iwe));
2373 iwe.cmd = SIOCGIWENCODE;
2374 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
2375 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
2376 else
2377 iwe.u.data.flags = IW_ENCODE_DISABLED;
2378 iwe.u.data.length = 0;
2379 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
2380 &iwe, "");
2381 if (IS_ERR(current_ev))
2382 return current_ev;
2383
2384 rcu_read_lock();
2385 ies = rcu_dereference(bss->pub.ies);
2386 rem = ies->len;
2387 ie = ies->data;
2388
2389 while (rem >= 2) {
2390
2391 if (ie[1] > rem - 2)
2392 break;
2393
2394 switch (ie[0]) {
2395 case WLAN_EID_SSID:
2396 memset(&iwe, 0, sizeof(iwe));
2397 iwe.cmd = SIOCGIWESSID;
2398 iwe.u.data.length = ie[1];
2399 iwe.u.data.flags = 1;
2400 current_ev = iwe_stream_add_point_check(info,
2401 current_ev,
2402 end_buf, &iwe,
2403 (u8 *)ie + 2);
2404 if (IS_ERR(current_ev))
2405 goto unlock;
2406 break;
2407 case WLAN_EID_MESH_ID:
2408 memset(&iwe, 0, sizeof(iwe));
2409 iwe.cmd = SIOCGIWESSID;
2410 iwe.u.data.length = ie[1];
2411 iwe.u.data.flags = 1;
2412 current_ev = iwe_stream_add_point_check(info,
2413 current_ev,
2414 end_buf, &iwe,
2415 (u8 *)ie + 2);
2416 if (IS_ERR(current_ev))
2417 goto unlock;
2418 break;
2419 case WLAN_EID_MESH_CONFIG:
2420 ismesh = true;
2421 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
2422 break;
2423 cfg = (u8 *)ie + 2;
2424 memset(&iwe, 0, sizeof(iwe));
2425 iwe.cmd = IWEVCUSTOM;
2426 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
2427 "0x%02X", cfg[0]);
2428 iwe.u.data.length = strlen(buf);
2429 current_ev = iwe_stream_add_point_check(info,
2430 current_ev,
2431 end_buf,
2432 &iwe, buf);
2433 if (IS_ERR(current_ev))
2434 goto unlock;
2435 sprintf(buf, "Path Selection Metric ID: 0x%02X",
2436 cfg[1]);
2437 iwe.u.data.length = strlen(buf);
2438 current_ev = iwe_stream_add_point_check(info,
2439 current_ev,
2440 end_buf,
2441 &iwe, buf);
2442 if (IS_ERR(current_ev))
2443 goto unlock;
2444 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
2445 cfg[2]);
2446 iwe.u.data.length = strlen(buf);
2447 current_ev = iwe_stream_add_point_check(info,
2448 current_ev,
2449 end_buf,
2450 &iwe, buf);
2451 if (IS_ERR(current_ev))
2452 goto unlock;
2453 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
2454 iwe.u.data.length = strlen(buf);
2455 current_ev = iwe_stream_add_point_check(info,
2456 current_ev,
2457 end_buf,
2458 &iwe, buf);
2459 if (IS_ERR(current_ev))
2460 goto unlock;
2461 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
2462 iwe.u.data.length = strlen(buf);
2463 current_ev = iwe_stream_add_point_check(info,
2464 current_ev,
2465 end_buf,
2466 &iwe, buf);
2467 if (IS_ERR(current_ev))
2468 goto unlock;
2469 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
2470 iwe.u.data.length = strlen(buf);
2471 current_ev = iwe_stream_add_point_check(info,
2472 current_ev,
2473 end_buf,
2474 &iwe, buf);
2475 if (IS_ERR(current_ev))
2476 goto unlock;
2477 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
2478 iwe.u.data.length = strlen(buf);
2479 current_ev = iwe_stream_add_point_check(info,
2480 current_ev,
2481 end_buf,
2482 &iwe, buf);
2483 if (IS_ERR(current_ev))
2484 goto unlock;
2485 break;
2486 case WLAN_EID_SUPP_RATES:
2487 case WLAN_EID_EXT_SUPP_RATES:
2488
2489 p = current_ev + iwe_stream_lcp_len(info);
2490
2491 memset(&iwe, 0, sizeof(iwe));
2492 iwe.cmd = SIOCGIWRATE;
2493
2494 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
2495
2496 for (i = 0; i < ie[1]; i++) {
2497 iwe.u.bitrate.value =
2498 ((ie[i + 2] & 0x7f) * 500000);
2499 tmp = p;
2500 p = iwe_stream_add_value(info, current_ev, p,
2501 end_buf, &iwe,
2502 IW_EV_PARAM_LEN);
2503 if (p == tmp) {
2504 current_ev = ERR_PTR(-E2BIG);
2505 goto unlock;
2506 }
2507 }
2508 current_ev = p;
2509 break;
2510 }
2511 rem -= ie[1] + 2;
2512 ie += ie[1] + 2;
2513 }
2514
2515 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
2516 ismesh) {
2517 memset(&iwe, 0, sizeof(iwe));
2518 iwe.cmd = SIOCGIWMODE;
2519 if (ismesh)
2520 iwe.u.mode = IW_MODE_MESH;
2521 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
2522 iwe.u.mode = IW_MODE_MASTER;
2523 else
2524 iwe.u.mode = IW_MODE_ADHOC;
2525 current_ev = iwe_stream_add_event_check(info, current_ev,
2526 end_buf, &iwe,
2527 IW_EV_UINT_LEN);
2528 if (IS_ERR(current_ev))
2529 goto unlock;
2530 }
2531
2532 memset(&iwe, 0, sizeof(iwe));
2533 iwe.cmd = IWEVCUSTOM;
2534 sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
2535 iwe.u.data.length = strlen(buf);
2536 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
2537 &iwe, buf);
2538 if (IS_ERR(current_ev))
2539 goto unlock;
2540 memset(&iwe, 0, sizeof(iwe));
2541 iwe.cmd = IWEVCUSTOM;
2542 sprintf(buf, " Last beacon: %ums ago",
2543 elapsed_jiffies_msecs(bss->ts));
2544 iwe.u.data.length = strlen(buf);
2545 current_ev = iwe_stream_add_point_check(info, current_ev,
2546 end_buf, &iwe, buf);
2547 if (IS_ERR(current_ev))
2548 goto unlock;
2549
2550 current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
2551
2552 unlock:
2553 rcu_read_unlock();
2554 return current_ev;
2555 }
2556
2557
2558 static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
2559 struct iw_request_info *info,
2560 char *buf, size_t len)
2561 {
2562 char *current_ev = buf;
2563 char *end_buf = buf + len;
2564 struct cfg80211_internal_bss *bss;
2565 int err = 0;
2566
2567 spin_lock_bh(&rdev->bss_lock);
2568 cfg80211_bss_expire(rdev);
2569
2570 list_for_each_entry(bss, &rdev->bss_list, list) {
2571 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
2572 err = -E2BIG;
2573 break;
2574 }
2575 current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
2576 current_ev, end_buf);
2577 if (IS_ERR(current_ev)) {
2578 err = PTR_ERR(current_ev);
2579 break;
2580 }
2581 }
2582 spin_unlock_bh(&rdev->bss_lock);
2583
2584 if (err)
2585 return err;
2586 return current_ev - buf;
2587 }
2588
2589
2590 int cfg80211_wext_giwscan(struct net_device *dev,
2591 struct iw_request_info *info,
2592 struct iw_point *data, char *extra)
2593 {
2594 struct cfg80211_registered_device *rdev;
2595 int res;
2596
2597 if (!netif_running(dev))
2598 return -ENETDOWN;
2599
2600 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2601
2602 if (IS_ERR(rdev))
2603 return PTR_ERR(rdev);
2604
2605 if (rdev->scan_req || rdev->scan_msg)
2606 return -EAGAIN;
2607
2608 res = ieee80211_scan_results(rdev, info, extra, data->length);
2609 data->length = 0;
2610 if (res >= 0) {
2611 data->length = res;
2612 res = 0;
2613 }
2614
2615 return res;
2616 }
2617 EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan);
2618 #endif