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1/*
2 * cfg80211 scan result handling
3 *
4 * Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
5 */
6#include <linux/kernel.h>
7#include <linux/slab.h>
8#include <linux/module.h>
9#include <linux/netdevice.h>
10#include <linux/wireless.h>
11#include <linux/nl80211.h>
12#include <linux/etherdevice.h>
13#include <net/arp.h>
14#include <net/cfg80211.h>
15#include <net/iw_handler.h>
16#include "core.h"
17#include "nl80211.h"
18#include "wext-compat.h"
19
20#define IEEE80211_SCAN_RESULT_EXPIRE (15 * HZ)
21
22void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak)
23{
24 struct cfg80211_scan_request *request;
25 struct net_device *dev;
26#ifdef CONFIG_CFG80211_WEXT
27 union iwreq_data wrqu;
28#endif
29
30 ASSERT_RDEV_LOCK(rdev);
31
32 request = rdev->scan_req;
33
34 if (!request)
35 return;
36
37 dev = request->dev;
38
39 /*
40 * This must be before sending the other events!
41 * Otherwise, wpa_supplicant gets completely confused with
42 * wext events.
43 */
44 cfg80211_sme_scan_done(dev);
45
46 if (request->aborted)
47 nl80211_send_scan_aborted(rdev, dev);
48 else
49 nl80211_send_scan_done(rdev, dev);
50
51#ifdef CONFIG_CFG80211_WEXT
52 if (!request->aborted) {
53 memset(&wrqu, 0, sizeof(wrqu));
54
55 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
56 }
57#endif
58
59 dev_put(dev);
60
61 rdev->scan_req = NULL;
62
63 /*
64 * OK. If this is invoked with "leak" then we can't
65 * free this ... but we've cleaned it up anyway. The
66 * driver failed to call the scan_done callback, so
67 * all bets are off, it might still be trying to use
68 * the scan request or not ... if it accesses the dev
69 * in there (it shouldn't anyway) then it may crash.
70 */
71 if (!leak)
72 kfree(request);
73}
74
75void __cfg80211_scan_done(struct work_struct *wk)
76{
77 struct cfg80211_registered_device *rdev;
78
79 rdev = container_of(wk, struct cfg80211_registered_device,
80 scan_done_wk);
81
82 cfg80211_lock_rdev(rdev);
83 ___cfg80211_scan_done(rdev, false);
84 cfg80211_unlock_rdev(rdev);
85}
86
87void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
88{
89 WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);
90
91 request->aborted = aborted;
92 queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk);
93}
94EXPORT_SYMBOL(cfg80211_scan_done);
95
96void __cfg80211_sched_scan_results(struct work_struct *wk)
97{
98 struct cfg80211_registered_device *rdev;
99
100 rdev = container_of(wk, struct cfg80211_registered_device,
101 sched_scan_results_wk);
102
103 mutex_lock(&rdev->sched_scan_mtx);
104
105 /* we don't have sched_scan_req anymore if the scan is stopping */
106 if (rdev->sched_scan_req)
107 nl80211_send_sched_scan_results(rdev,
108 rdev->sched_scan_req->dev);
109
110 mutex_unlock(&rdev->sched_scan_mtx);
111}
112
113void cfg80211_sched_scan_results(struct wiphy *wiphy)
114{
115 /* ignore if we're not scanning */
116 if (wiphy_to_dev(wiphy)->sched_scan_req)
117 queue_work(cfg80211_wq,
118 &wiphy_to_dev(wiphy)->sched_scan_results_wk);
119}
120EXPORT_SYMBOL(cfg80211_sched_scan_results);
121
122void cfg80211_sched_scan_stopped(struct wiphy *wiphy)
123{
124 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
125
126 mutex_lock(&rdev->sched_scan_mtx);
127 __cfg80211_stop_sched_scan(rdev, true);
128 mutex_unlock(&rdev->sched_scan_mtx);
129}
130EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
131
132int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
133 bool driver_initiated)
134{
135 struct net_device *dev;
136
137 lockdep_assert_held(&rdev->sched_scan_mtx);
138
139 if (!rdev->sched_scan_req)
140 return -ENOENT;
141
142 dev = rdev->sched_scan_req->dev;
143
144 if (!driver_initiated) {
145 int err = rdev->ops->sched_scan_stop(&rdev->wiphy, dev);
146 if (err)
147 return err;
148 }
149
150 nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED);
151
152 kfree(rdev->sched_scan_req);
153 rdev->sched_scan_req = NULL;
154
155 return 0;
156}
157
158static void bss_release(struct kref *ref)
159{
160 struct cfg80211_internal_bss *bss;
161
162 bss = container_of(ref, struct cfg80211_internal_bss, ref);
163 if (bss->pub.free_priv)
164 bss->pub.free_priv(&bss->pub);
165
166 if (bss->beacon_ies_allocated)
167 kfree(bss->pub.beacon_ies);
168 if (bss->proberesp_ies_allocated)
169 kfree(bss->pub.proberesp_ies);
170
171 BUG_ON(atomic_read(&bss->hold));
172
173 kfree(bss);
174}
175
176/* must hold dev->bss_lock! */
177void cfg80211_bss_age(struct cfg80211_registered_device *dev,
178 unsigned long age_secs)
179{
180 struct cfg80211_internal_bss *bss;
181 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
182
183 list_for_each_entry(bss, &dev->bss_list, list) {
184 bss->ts -= age_jiffies;
185 }
186}
187
188/* must hold dev->bss_lock! */
189static void __cfg80211_unlink_bss(struct cfg80211_registered_device *dev,
190 struct cfg80211_internal_bss *bss)
191{
192 list_del_init(&bss->list);
193 rb_erase(&bss->rbn, &dev->bss_tree);
194 kref_put(&bss->ref, bss_release);
195}
196
197/* must hold dev->bss_lock! */
198void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
199{
200 struct cfg80211_internal_bss *bss, *tmp;
201 bool expired = false;
202
203 list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
204 if (atomic_read(&bss->hold))
205 continue;
206 if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE))
207 continue;
208 __cfg80211_unlink_bss(dev, bss);
209 expired = true;
210 }
211
212 if (expired)
213 dev->bss_generation++;
214}
215
216const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len)
217{
218 while (len > 2 && ies[0] != eid) {
219 len -= ies[1] + 2;
220 ies += ies[1] + 2;
221 }
222 if (len < 2)
223 return NULL;
224 if (len < 2 + ies[1])
225 return NULL;
226 return ies;
227}
228EXPORT_SYMBOL(cfg80211_find_ie);
229
230static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
231{
232 const u8 *ie1 = cfg80211_find_ie(num, ies1, len1);
233 const u8 *ie2 = cfg80211_find_ie(num, ies2, len2);
234 int r;
235
236 if (!ie1 && !ie2)
237 return 0;
238 if (!ie1 || !ie2)
239 return -1;
240
241 r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1]));
242 if (r == 0 && ie1[1] != ie2[1])
243 return ie2[1] - ie1[1];
244 return r;
245}
246
247static bool is_bss(struct cfg80211_bss *a,
248 const u8 *bssid,
249 const u8 *ssid, size_t ssid_len)
250{
251 const u8 *ssidie;
252
253 if (bssid && compare_ether_addr(a->bssid, bssid))
254 return false;
255
256 if (!ssid)
257 return true;
258
259 ssidie = cfg80211_find_ie(WLAN_EID_SSID,
260 a->information_elements,
261 a->len_information_elements);
262 if (!ssidie)
263 return false;
264 if (ssidie[1] != ssid_len)
265 return false;
266 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
267}
268
269static bool is_mesh_bss(struct cfg80211_bss *a)
270{
271 const u8 *ie;
272
273 if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
274 return false;
275
276 ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
277 a->information_elements,
278 a->len_information_elements);
279 if (!ie)
280 return false;
281
282 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
283 a->information_elements,
284 a->len_information_elements);
285 if (!ie)
286 return false;
287
288 return true;
289}
290
291static bool is_mesh(struct cfg80211_bss *a,
292 const u8 *meshid, size_t meshidlen,
293 const u8 *meshcfg)
294{
295 const u8 *ie;
296
297 if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
298 return false;
299
300 ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
301 a->information_elements,
302 a->len_information_elements);
303 if (!ie)
304 return false;
305 if (ie[1] != meshidlen)
306 return false;
307 if (memcmp(ie + 2, meshid, meshidlen))
308 return false;
309
310 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
311 a->information_elements,
312 a->len_information_elements);
313 if (!ie)
314 return false;
315 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
316 return false;
317
318 /*
319 * Ignore mesh capability (last two bytes of the IE) when
320 * comparing since that may differ between stations taking
321 * part in the same mesh.
322 */
323 return memcmp(ie + 2, meshcfg,
324 sizeof(struct ieee80211_meshconf_ie) - 2) == 0;
325}
326
327static int cmp_bss(struct cfg80211_bss *a,
328 struct cfg80211_bss *b)
329{
330 int r;
331
332 if (a->channel != b->channel)
333 return b->channel->center_freq - a->channel->center_freq;
334
335 if (is_mesh_bss(a) && is_mesh_bss(b)) {
336 r = cmp_ies(WLAN_EID_MESH_ID,
337 a->information_elements,
338 a->len_information_elements,
339 b->information_elements,
340 b->len_information_elements);
341 if (r)
342 return r;
343 return cmp_ies(WLAN_EID_MESH_CONFIG,
344 a->information_elements,
345 a->len_information_elements,
346 b->information_elements,
347 b->len_information_elements);
348 }
349
350 r = memcmp(a->bssid, b->bssid, ETH_ALEN);
351 if (r)
352 return r;
353
354 return cmp_ies(WLAN_EID_SSID,
355 a->information_elements,
356 a->len_information_elements,
357 b->information_elements,
358 b->len_information_elements);
359}
360
361struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
362 struct ieee80211_channel *channel,
363 const u8 *bssid,
364 const u8 *ssid, size_t ssid_len,
365 u16 capa_mask, u16 capa_val)
366{
367 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
368 struct cfg80211_internal_bss *bss, *res = NULL;
369 unsigned long now = jiffies;
370
371 spin_lock_bh(&dev->bss_lock);
372
373 list_for_each_entry(bss, &dev->bss_list, list) {
374 if ((bss->pub.capability & capa_mask) != capa_val)
375 continue;
376 if (channel && bss->pub.channel != channel)
377 continue;
378 /* Don't get expired BSS structs */
379 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
380 !atomic_read(&bss->hold))
381 continue;
382 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
383 res = bss;
384 kref_get(&res->ref);
385 break;
386 }
387 }
388
389 spin_unlock_bh(&dev->bss_lock);
390 if (!res)
391 return NULL;
392 return &res->pub;
393}
394EXPORT_SYMBOL(cfg80211_get_bss);
395
396struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
397 struct ieee80211_channel *channel,
398 const u8 *meshid, size_t meshidlen,
399 const u8 *meshcfg)
400{
401 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
402 struct cfg80211_internal_bss *bss, *res = NULL;
403
404 spin_lock_bh(&dev->bss_lock);
405
406 list_for_each_entry(bss, &dev->bss_list, list) {
407 if (channel && bss->pub.channel != channel)
408 continue;
409 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
410 res = bss;
411 kref_get(&res->ref);
412 break;
413 }
414 }
415
416 spin_unlock_bh(&dev->bss_lock);
417 if (!res)
418 return NULL;
419 return &res->pub;
420}
421EXPORT_SYMBOL(cfg80211_get_mesh);
422
423
424static void rb_insert_bss(struct cfg80211_registered_device *dev,
425 struct cfg80211_internal_bss *bss)
426{
427 struct rb_node **p = &dev->bss_tree.rb_node;
428 struct rb_node *parent = NULL;
429 struct cfg80211_internal_bss *tbss;
430 int cmp;
431
432 while (*p) {
433 parent = *p;
434 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
435
436 cmp = cmp_bss(&bss->pub, &tbss->pub);
437
438 if (WARN_ON(!cmp)) {
439 /* will sort of leak this BSS */
440 return;
441 }
442
443 if (cmp < 0)
444 p = &(*p)->rb_left;
445 else
446 p = &(*p)->rb_right;
447 }
448
449 rb_link_node(&bss->rbn, parent, p);
450 rb_insert_color(&bss->rbn, &dev->bss_tree);
451}
452
453static struct cfg80211_internal_bss *
454rb_find_bss(struct cfg80211_registered_device *dev,
455 struct cfg80211_internal_bss *res)
456{
457 struct rb_node *n = dev->bss_tree.rb_node;
458 struct cfg80211_internal_bss *bss;
459 int r;
460
461 while (n) {
462 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
463 r = cmp_bss(&res->pub, &bss->pub);
464
465 if (r == 0)
466 return bss;
467 else if (r < 0)
468 n = n->rb_left;
469 else
470 n = n->rb_right;
471 }
472
473 return NULL;
474}
475
476static struct cfg80211_internal_bss *
477cfg80211_bss_update(struct cfg80211_registered_device *dev,
478 struct cfg80211_internal_bss *res)
479{
480 struct cfg80211_internal_bss *found = NULL;
481
482 /*
483 * The reference to "res" is donated to this function.
484 */
485
486 if (WARN_ON(!res->pub.channel)) {
487 kref_put(&res->ref, bss_release);
488 return NULL;
489 }
490
491 res->ts = jiffies;
492
493 spin_lock_bh(&dev->bss_lock);
494
495 found = rb_find_bss(dev, res);
496
497 if (found) {
498 found->pub.beacon_interval = res->pub.beacon_interval;
499 found->pub.tsf = res->pub.tsf;
500 found->pub.signal = res->pub.signal;
501 found->pub.capability = res->pub.capability;
502 found->ts = res->ts;
503
504 /* Update IEs */
505 if (res->pub.proberesp_ies) {
506 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
507 size_t ielen = res->pub.len_proberesp_ies;
508
509 if (found->pub.proberesp_ies &&
510 !found->proberesp_ies_allocated &&
511 ksize(found) >= used + ielen) {
512 memcpy(found->pub.proberesp_ies,
513 res->pub.proberesp_ies, ielen);
514 found->pub.len_proberesp_ies = ielen;
515 } else {
516 u8 *ies = found->pub.proberesp_ies;
517
518 if (found->proberesp_ies_allocated)
519 ies = krealloc(ies, ielen, GFP_ATOMIC);
520 else
521 ies = kmalloc(ielen, GFP_ATOMIC);
522
523 if (ies) {
524 memcpy(ies, res->pub.proberesp_ies,
525 ielen);
526 found->proberesp_ies_allocated = true;
527 found->pub.proberesp_ies = ies;
528 found->pub.len_proberesp_ies = ielen;
529 }
530 }
531
532 /* Override possible earlier Beacon frame IEs */
533 found->pub.information_elements =
534 found->pub.proberesp_ies;
535 found->pub.len_information_elements =
536 found->pub.len_proberesp_ies;
537 }
538 if (res->pub.beacon_ies) {
539 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
540 size_t ielen = res->pub.len_beacon_ies;
541 bool information_elements_is_beacon_ies =
542 (found->pub.information_elements ==
543 found->pub.beacon_ies);
544
545 if (found->pub.beacon_ies &&
546 !found->beacon_ies_allocated &&
547 ksize(found) >= used + ielen) {
548 memcpy(found->pub.beacon_ies,
549 res->pub.beacon_ies, ielen);
550 found->pub.len_beacon_ies = ielen;
551 } else {
552 u8 *ies = found->pub.beacon_ies;
553
554 if (found->beacon_ies_allocated)
555 ies = krealloc(ies, ielen, GFP_ATOMIC);
556 else
557 ies = kmalloc(ielen, GFP_ATOMIC);
558
559 if (ies) {
560 memcpy(ies, res->pub.beacon_ies,
561 ielen);
562 found->beacon_ies_allocated = true;
563 found->pub.beacon_ies = ies;
564 found->pub.len_beacon_ies = ielen;
565 }
566 }
567
568 /* Override IEs if they were from a beacon before */
569 if (information_elements_is_beacon_ies) {
570 found->pub.information_elements =
571 found->pub.beacon_ies;
572 found->pub.len_information_elements =
573 found->pub.len_beacon_ies;
574 }
575 }
576
577 kref_put(&res->ref, bss_release);
578 } else {
579 /* this "consumes" the reference */
580 list_add_tail(&res->list, &dev->bss_list);
581 rb_insert_bss(dev, res);
582 found = res;
583 }
584
585 dev->bss_generation++;
586 spin_unlock_bh(&dev->bss_lock);
587
588 kref_get(&found->ref);
589 return found;
590}
591
592struct cfg80211_bss*
593cfg80211_inform_bss(struct wiphy *wiphy,
594 struct ieee80211_channel *channel,
595 const u8 *bssid,
596 u64 timestamp, u16 capability, u16 beacon_interval,
597 const u8 *ie, size_t ielen,
598 s32 signal, gfp_t gfp)
599{
600 struct cfg80211_internal_bss *res;
601 size_t privsz;
602
603 if (WARN_ON(!wiphy))
604 return NULL;
605
606 privsz = wiphy->bss_priv_size;
607
608 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
609 (signal < 0 || signal > 100)))
610 return NULL;
611
612 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
613 if (!res)
614 return NULL;
615
616 memcpy(res->pub.bssid, bssid, ETH_ALEN);
617 res->pub.channel = channel;
618 res->pub.signal = signal;
619 res->pub.tsf = timestamp;
620 res->pub.beacon_interval = beacon_interval;
621 res->pub.capability = capability;
622 /*
623 * Since we do not know here whether the IEs are from a Beacon or Probe
624 * Response frame, we need to pick one of the options and only use it
625 * with the driver that does not provide the full Beacon/Probe Response
626 * frame. Use Beacon frame pointer to avoid indicating that this should
627 * override the information_elements pointer should we have received an
628 * earlier indication of Probe Response data.
629 *
630 * The initial buffer for the IEs is allocated with the BSS entry and
631 * is located after the private area.
632 */
633 res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz;
634 memcpy(res->pub.beacon_ies, ie, ielen);
635 res->pub.len_beacon_ies = ielen;
636 res->pub.information_elements = res->pub.beacon_ies;
637 res->pub.len_information_elements = res->pub.len_beacon_ies;
638
639 kref_init(&res->ref);
640
641 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
642 if (!res)
643 return NULL;
644
645 if (res->pub.capability & WLAN_CAPABILITY_ESS)
646 regulatory_hint_found_beacon(wiphy, channel, gfp);
647
648 /* cfg80211_bss_update gives us a referenced result */
649 return &res->pub;
650}
651EXPORT_SYMBOL(cfg80211_inform_bss);
652
653struct cfg80211_bss *
654cfg80211_inform_bss_frame(struct wiphy *wiphy,
655 struct ieee80211_channel *channel,
656 struct ieee80211_mgmt *mgmt, size_t len,
657 s32 signal, gfp_t gfp)
658{
659 struct cfg80211_internal_bss *res;
660 size_t ielen = len - offsetof(struct ieee80211_mgmt,
661 u.probe_resp.variable);
662 size_t privsz;
663
664 if (WARN_ON(!mgmt))
665 return NULL;
666
667 if (WARN_ON(!wiphy))
668 return NULL;
669
670 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
671 (signal < 0 || signal > 100)))
672 return NULL;
673
674 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
675 return NULL;
676
677 privsz = wiphy->bss_priv_size;
678
679 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
680 if (!res)
681 return NULL;
682
683 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
684 res->pub.channel = channel;
685 res->pub.signal = signal;
686 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
687 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
688 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
689 /*
690 * The initial buffer for the IEs is allocated with the BSS entry and
691 * is located after the private area.
692 */
693 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
694 res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz;
695 memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable,
696 ielen);
697 res->pub.len_proberesp_ies = ielen;
698 res->pub.information_elements = res->pub.proberesp_ies;
699 res->pub.len_information_elements = res->pub.len_proberesp_ies;
700 } else {
701 res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz;
702 memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen);
703 res->pub.len_beacon_ies = ielen;
704 res->pub.information_elements = res->pub.beacon_ies;
705 res->pub.len_information_elements = res->pub.len_beacon_ies;
706 }
707
708 kref_init(&res->ref);
709
710 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
711 if (!res)
712 return NULL;
713
714 if (res->pub.capability & WLAN_CAPABILITY_ESS)
715 regulatory_hint_found_beacon(wiphy, channel, gfp);
716
717 /* cfg80211_bss_update gives us a referenced result */
718 return &res->pub;
719}
720EXPORT_SYMBOL(cfg80211_inform_bss_frame);
721
722void cfg80211_put_bss(struct cfg80211_bss *pub)
723{
724 struct cfg80211_internal_bss *bss;
725
726 if (!pub)
727 return;
728
729 bss = container_of(pub, struct cfg80211_internal_bss, pub);
730 kref_put(&bss->ref, bss_release);
731}
732EXPORT_SYMBOL(cfg80211_put_bss);
733
734void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
735{
736 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
737 struct cfg80211_internal_bss *bss;
738
739 if (WARN_ON(!pub))
740 return;
741
742 bss = container_of(pub, struct cfg80211_internal_bss, pub);
743
744 spin_lock_bh(&dev->bss_lock);
745 if (!list_empty(&bss->list)) {
746 __cfg80211_unlink_bss(dev, bss);
747 dev->bss_generation++;
748 }
749 spin_unlock_bh(&dev->bss_lock);
750}
751EXPORT_SYMBOL(cfg80211_unlink_bss);
752
753#ifdef CONFIG_CFG80211_WEXT
754int cfg80211_wext_siwscan(struct net_device *dev,
755 struct iw_request_info *info,
756 union iwreq_data *wrqu, char *extra)
757{
758 struct cfg80211_registered_device *rdev;
759 struct wiphy *wiphy;
760 struct iw_scan_req *wreq = NULL;
761 struct cfg80211_scan_request *creq = NULL;
762 int i, err, n_channels = 0;
763 enum ieee80211_band band;
764
765 if (!netif_running(dev))
766 return -ENETDOWN;
767
768 if (wrqu->data.length == sizeof(struct iw_scan_req))
769 wreq = (struct iw_scan_req *)extra;
770
771 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
772
773 if (IS_ERR(rdev))
774 return PTR_ERR(rdev);
775
776 if (rdev->scan_req) {
777 err = -EBUSY;
778 goto out;
779 }
780
781 wiphy = &rdev->wiphy;
782
783 /* Determine number of channels, needed to allocate creq */
784 if (wreq && wreq->num_channels)
785 n_channels = wreq->num_channels;
786 else {
787 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
788 if (wiphy->bands[band])
789 n_channels += wiphy->bands[band]->n_channels;
790 }
791
792 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
793 n_channels * sizeof(void *),
794 GFP_ATOMIC);
795 if (!creq) {
796 err = -ENOMEM;
797 goto out;
798 }
799
800 creq->wiphy = wiphy;
801 creq->dev = dev;
802 /* SSIDs come after channels */
803 creq->ssids = (void *)&creq->channels[n_channels];
804 creq->n_channels = n_channels;
805 creq->n_ssids = 1;
806
807 /* translate "Scan on frequencies" request */
808 i = 0;
809 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
810 int j;
811
812 if (!wiphy->bands[band])
813 continue;
814
815 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
816 /* ignore disabled channels */
817 if (wiphy->bands[band]->channels[j].flags &
818 IEEE80211_CHAN_DISABLED)
819 continue;
820
821 /* If we have a wireless request structure and the
822 * wireless request specifies frequencies, then search
823 * for the matching hardware channel.
824 */
825 if (wreq && wreq->num_channels) {
826 int k;
827 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
828 for (k = 0; k < wreq->num_channels; k++) {
829 int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]);
830 if (wext_freq == wiphy_freq)
831 goto wext_freq_found;
832 }
833 goto wext_freq_not_found;
834 }
835
836 wext_freq_found:
837 creq->channels[i] = &wiphy->bands[band]->channels[j];
838 i++;
839 wext_freq_not_found: ;
840 }
841 }
842 /* No channels found? */
843 if (!i) {
844 err = -EINVAL;
845 goto out;
846 }
847
848 /* Set real number of channels specified in creq->channels[] */
849 creq->n_channels = i;
850
851 /* translate "Scan for SSID" request */
852 if (wreq) {
853 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
854 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
855 err = -EINVAL;
856 goto out;
857 }
858 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
859 creq->ssids[0].ssid_len = wreq->essid_len;
860 }
861 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
862 creq->n_ssids = 0;
863 }
864
865 for (i = 0; i < IEEE80211_NUM_BANDS; i++)
866 if (wiphy->bands[i])
867 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
868
869 rdev->scan_req = creq;
870 err = rdev->ops->scan(wiphy, dev, creq);
871 if (err) {
872 rdev->scan_req = NULL;
873 /* creq will be freed below */
874 } else {
875 nl80211_send_scan_start(rdev, dev);
876 /* creq now owned by driver */
877 creq = NULL;
878 dev_hold(dev);
879 }
880 out:
881 kfree(creq);
882 cfg80211_unlock_rdev(rdev);
883 return err;
884}
885EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
886
887static void ieee80211_scan_add_ies(struct iw_request_info *info,
888 struct cfg80211_bss *bss,
889 char **current_ev, char *end_buf)
890{
891 u8 *pos, *end, *next;
892 struct iw_event iwe;
893
894 if (!bss->information_elements ||
895 !bss->len_information_elements)
896 return;
897
898 /*
899 * If needed, fragment the IEs buffer (at IE boundaries) into short
900 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
901 */
902 pos = bss->information_elements;
903 end = pos + bss->len_information_elements;
904
905 while (end - pos > IW_GENERIC_IE_MAX) {
906 next = pos + 2 + pos[1];
907 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
908 next = next + 2 + next[1];
909
910 memset(&iwe, 0, sizeof(iwe));
911 iwe.cmd = IWEVGENIE;
912 iwe.u.data.length = next - pos;
913 *current_ev = iwe_stream_add_point(info, *current_ev,
914 end_buf, &iwe, pos);
915
916 pos = next;
917 }
918
919 if (end > pos) {
920 memset(&iwe, 0, sizeof(iwe));
921 iwe.cmd = IWEVGENIE;
922 iwe.u.data.length = end - pos;
923 *current_ev = iwe_stream_add_point(info, *current_ev,
924 end_buf, &iwe, pos);
925 }
926}
927
928static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
929{
930 unsigned long end = jiffies;
931
932 if (end >= start)
933 return jiffies_to_msecs(end - start);
934
935 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
936}
937
938static char *
939ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
940 struct cfg80211_internal_bss *bss, char *current_ev,
941 char *end_buf)
942{
943 struct iw_event iwe;
944 u8 *buf, *cfg, *p;
945 u8 *ie = bss->pub.information_elements;
946 int rem = bss->pub.len_information_elements, i, sig;
947 bool ismesh = false;
948
949 memset(&iwe, 0, sizeof(iwe));
950 iwe.cmd = SIOCGIWAP;
951 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
952 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
953 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
954 IW_EV_ADDR_LEN);
955
956 memset(&iwe, 0, sizeof(iwe));
957 iwe.cmd = SIOCGIWFREQ;
958 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
959 iwe.u.freq.e = 0;
960 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
961 IW_EV_FREQ_LEN);
962
963 memset(&iwe, 0, sizeof(iwe));
964 iwe.cmd = SIOCGIWFREQ;
965 iwe.u.freq.m = bss->pub.channel->center_freq;
966 iwe.u.freq.e = 6;
967 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
968 IW_EV_FREQ_LEN);
969
970 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
971 memset(&iwe, 0, sizeof(iwe));
972 iwe.cmd = IWEVQUAL;
973 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
974 IW_QUAL_NOISE_INVALID |
975 IW_QUAL_QUAL_UPDATED;
976 switch (wiphy->signal_type) {
977 case CFG80211_SIGNAL_TYPE_MBM:
978 sig = bss->pub.signal / 100;
979 iwe.u.qual.level = sig;
980 iwe.u.qual.updated |= IW_QUAL_DBM;
981 if (sig < -110) /* rather bad */
982 sig = -110;
983 else if (sig > -40) /* perfect */
984 sig = -40;
985 /* will give a range of 0 .. 70 */
986 iwe.u.qual.qual = sig + 110;
987 break;
988 case CFG80211_SIGNAL_TYPE_UNSPEC:
989 iwe.u.qual.level = bss->pub.signal;
990 /* will give range 0 .. 100 */
991 iwe.u.qual.qual = bss->pub.signal;
992 break;
993 default:
994 /* not reached */
995 break;
996 }
997 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
998 &iwe, IW_EV_QUAL_LEN);
999 }
1000
1001 memset(&iwe, 0, sizeof(iwe));
1002 iwe.cmd = SIOCGIWENCODE;
1003 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
1004 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1005 else
1006 iwe.u.data.flags = IW_ENCODE_DISABLED;
1007 iwe.u.data.length = 0;
1008 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1009 &iwe, "");
1010
1011 while (rem >= 2) {
1012 /* invalid data */
1013 if (ie[1] > rem - 2)
1014 break;
1015
1016 switch (ie[0]) {
1017 case WLAN_EID_SSID:
1018 memset(&iwe, 0, sizeof(iwe));
1019 iwe.cmd = SIOCGIWESSID;
1020 iwe.u.data.length = ie[1];
1021 iwe.u.data.flags = 1;
1022 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1023 &iwe, ie + 2);
1024 break;
1025 case WLAN_EID_MESH_ID:
1026 memset(&iwe, 0, sizeof(iwe));
1027 iwe.cmd = SIOCGIWESSID;
1028 iwe.u.data.length = ie[1];
1029 iwe.u.data.flags = 1;
1030 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1031 &iwe, ie + 2);
1032 break;
1033 case WLAN_EID_MESH_CONFIG:
1034 ismesh = true;
1035 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
1036 break;
1037 buf = kmalloc(50, GFP_ATOMIC);
1038 if (!buf)
1039 break;
1040 cfg = ie + 2;
1041 memset(&iwe, 0, sizeof(iwe));
1042 iwe.cmd = IWEVCUSTOM;
1043 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
1044 "0x%02X", cfg[0]);
1045 iwe.u.data.length = strlen(buf);
1046 current_ev = iwe_stream_add_point(info, current_ev,
1047 end_buf,
1048 &iwe, buf);
1049 sprintf(buf, "Path Selection Metric ID: 0x%02X",
1050 cfg[1]);
1051 iwe.u.data.length = strlen(buf);
1052 current_ev = iwe_stream_add_point(info, current_ev,
1053 end_buf,
1054 &iwe, buf);
1055 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
1056 cfg[2]);
1057 iwe.u.data.length = strlen(buf);
1058 current_ev = iwe_stream_add_point(info, current_ev,
1059 end_buf,
1060 &iwe, buf);
1061 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
1062 iwe.u.data.length = strlen(buf);
1063 current_ev = iwe_stream_add_point(info, current_ev,
1064 end_buf,
1065 &iwe, buf);
1066 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
1067 iwe.u.data.length = strlen(buf);
1068 current_ev = iwe_stream_add_point(info, current_ev,
1069 end_buf,
1070 &iwe, buf);
1071 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
1072 iwe.u.data.length = strlen(buf);
1073 current_ev = iwe_stream_add_point(info, current_ev,
1074 end_buf,
1075 &iwe, buf);
1076 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
1077 iwe.u.data.length = strlen(buf);
1078 current_ev = iwe_stream_add_point(info, current_ev,
1079 end_buf,
1080 &iwe, buf);
1081 kfree(buf);
1082 break;
1083 case WLAN_EID_SUPP_RATES:
1084 case WLAN_EID_EXT_SUPP_RATES:
1085 /* display all supported rates in readable format */
1086 p = current_ev + iwe_stream_lcp_len(info);
1087
1088 memset(&iwe, 0, sizeof(iwe));
1089 iwe.cmd = SIOCGIWRATE;
1090 /* Those two flags are ignored... */
1091 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
1092
1093 for (i = 0; i < ie[1]; i++) {
1094 iwe.u.bitrate.value =
1095 ((ie[i + 2] & 0x7f) * 500000);
1096 p = iwe_stream_add_value(info, current_ev, p,
1097 end_buf, &iwe, IW_EV_PARAM_LEN);
1098 }
1099 current_ev = p;
1100 break;
1101 }
1102 rem -= ie[1] + 2;
1103 ie += ie[1] + 2;
1104 }
1105
1106 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
1107 ismesh) {
1108 memset(&iwe, 0, sizeof(iwe));
1109 iwe.cmd = SIOCGIWMODE;
1110 if (ismesh)
1111 iwe.u.mode = IW_MODE_MESH;
1112 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
1113 iwe.u.mode = IW_MODE_MASTER;
1114 else
1115 iwe.u.mode = IW_MODE_ADHOC;
1116 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1117 &iwe, IW_EV_UINT_LEN);
1118 }
1119
1120 buf = kmalloc(30, GFP_ATOMIC);
1121 if (buf) {
1122 memset(&iwe, 0, sizeof(iwe));
1123 iwe.cmd = IWEVCUSTOM;
1124 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
1125 iwe.u.data.length = strlen(buf);
1126 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1127 &iwe, buf);
1128 memset(&iwe, 0, sizeof(iwe));
1129 iwe.cmd = IWEVCUSTOM;
1130 sprintf(buf, " Last beacon: %ums ago",
1131 elapsed_jiffies_msecs(bss->ts));
1132 iwe.u.data.length = strlen(buf);
1133 current_ev = iwe_stream_add_point(info, current_ev,
1134 end_buf, &iwe, buf);
1135 kfree(buf);
1136 }
1137
1138 ieee80211_scan_add_ies(info, &bss->pub, ¤t_ev, end_buf);
1139
1140 return current_ev;
1141}
1142
1143
1144static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
1145 struct iw_request_info *info,
1146 char *buf, size_t len)
1147{
1148 char *current_ev = buf;
1149 char *end_buf = buf + len;
1150 struct cfg80211_internal_bss *bss;
1151
1152 spin_lock_bh(&dev->bss_lock);
1153 cfg80211_bss_expire(dev);
1154
1155 list_for_each_entry(bss, &dev->bss_list, list) {
1156 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
1157 spin_unlock_bh(&dev->bss_lock);
1158 return -E2BIG;
1159 }
1160 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
1161 current_ev, end_buf);
1162 }
1163 spin_unlock_bh(&dev->bss_lock);
1164 return current_ev - buf;
1165}
1166
1167
1168int cfg80211_wext_giwscan(struct net_device *dev,
1169 struct iw_request_info *info,
1170 struct iw_point *data, char *extra)
1171{
1172 struct cfg80211_registered_device *rdev;
1173 int res;
1174
1175 if (!netif_running(dev))
1176 return -ENETDOWN;
1177
1178 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1179
1180 if (IS_ERR(rdev))
1181 return PTR_ERR(rdev);
1182
1183 if (rdev->scan_req) {
1184 res = -EAGAIN;
1185 goto out;
1186 }
1187
1188 res = ieee80211_scan_results(rdev, info, extra, data->length);
1189 data->length = 0;
1190 if (res >= 0) {
1191 data->length = res;
1192 res = 0;
1193 }
1194
1195 out:
1196 cfg80211_unlock_rdev(rdev);
1197 return res;
1198}
1199EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);
1200#endif
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * cfg80211 scan result handling
4 *
5 * Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
7 * Copyright 2016 Intel Deutschland GmbH
8 * Copyright (C) 2018-2019 Intel Corporation
9 */
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"
25
26/**
27 * DOC: BSS tree/list structure
28 *
29 * At the top level, the BSS list is kept in both a list in each
30 * registered device (@bss_list) as well as an RB-tree for faster
31 * lookup. In the RB-tree, entries can be looked up using their
32 * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID
33 * for other BSSes.
34 *
35 * Due to the possibility of hidden SSIDs, there's a second level
36 * structure, the "hidden_list" and "hidden_beacon_bss" pointer.
37 * The hidden_list connects all BSSes belonging to a single AP
38 * that has a hidden SSID, and connects beacon and probe response
39 * entries. For a probe response entry for a hidden SSID, the
40 * hidden_beacon_bss pointer points to the BSS struct holding the
41 * beacon's information.
42 *
43 * Reference counting is done for all these references except for
44 * the hidden_list, so that a beacon BSS struct that is otherwise
45 * not referenced has one reference for being on the bss_list and
46 * one for each probe response entry that points to it using the
47 * hidden_beacon_bss pointer. When a BSS struct that has such a
48 * pointer is get/put, the refcount update is also propagated to
49 * the referenced struct, this ensure that it cannot get removed
50 * while somebody is using the probe response version.
51 *
52 * Note that the hidden_beacon_bss pointer never changes, due to
53 * the reference counting. Therefore, no locking is needed for
54 * it.
55 *
56 * Also note that the hidden_beacon_bss pointer is only relevant
57 * if the driver uses something other than the IEs, e.g. private
58 * data stored stored in the BSS struct, since the beacon IEs are
59 * also linked into the probe response struct.
60 */
61
62/*
63 * Limit the number of BSS entries stored in mac80211. Each one is
64 * a bit over 4k at most, so this limits to roughly 4-5M of memory.
65 * If somebody wants to really attack this though, they'd likely
66 * use small beacons, and only one type of frame, limiting each of
67 * the entries to a much smaller size (in order to generate more
68 * entries in total, so overhead is bigger.)
69 */
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 * This happens when the module is removed, it doesn't
93 * really matter any more save for completeness
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 * don't remove the beacon entry if it has
160 * probe responses associated with it
161 */
162 if (!bss->pub.hidden_beacon_bss)
163 return false;
164 /*
165 * if it's a probe response entry break its
166 * link to the other entries in the group
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 * non inheritance element format is:
196 * ext ID (56) | IDs list len | list | extension IDs list len | list
197 * Both lists are optional. Both lengths are mandatory.
198 * This means valid length is:
199 * elem_len = 1 (extension ID) + 2 (list len fields) + list lengths
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 /* copy subelement as we need to change its content to
242 * mark an ie after it is processed.
243 */
244 sub_copy = kmemdup(subelement, subie_len, gfp);
245 if (!sub_copy)
246 return 0;
247
248 pos = &new_ie[0];
249
250 /* set new ssid */
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 /* get non inheritance list if exists */
258 non_inherit_elem =
259 cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE,
260 sub_copy, subie_len);
261
262 /* go through IEs in ie (skip SSID) and subelement,
263 * merge them into new_ie
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 /* ie in old ie but not in subelement */
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 /* ie in transmitting ie also in subelement,
292 * copy from subelement and flag the ie in subelement
293 * as copied (by setting eid field to WLAN_EID_SSID,
294 * which is skipped anyway).
295 * For vendor ie, compare OUI + type + subType to
296 * determine if they are the same ie.
297 */
298 if (tmp_old[0] == WLAN_EID_VENDOR_SPECIFIC) {
299 if (!memcmp(tmp_old + 2, tmp + 2, 5)) {
300 /* same vendor ie, copy from
301 * subelement
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 /* copy ie from subelement into new ie */
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 /* go through subelement again to check if there is any ie not
325 * copied to new ie, skip ssid, capability, bssid-index ie
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 /* check if nontrans_bss is in the list */
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 /* add to the list */
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 * The callers make sure to increase rdev->bss_generation if anything
442 * gets removed (and a new entry added), so there's no need to also do
443 * it here.
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 * This must be before sending the other events!
477 * Otherwise, wpa_supplicant gets completely confused with
478 * wext events.
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 /* flush entries from previous scans */
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 * Determines if a scheduled scan request can be handled. When a legacy
570 * scheduled scan is running no other scheduled scan is allowed regardless
571 * whether the request is for legacy or multi-support scan. When a multi-support
572 * scheduled scan is running a request for legacy scan is not allowed. In this
573 * case a request for multi-support scan can be handled if resources are
574 * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached.
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 /* request id zero means legacy in progress */
584 if (!i && !pos->reqid)
585 return -EINPROGRESS;
586 i++;
587 }
588
589 if (i) {
590 /* no legacy allowed when multi request(s) are active */
591 if (!want_multi)
592 return -EINPROGRESS;
593
594 /* resource limit reached */
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 /* flush entries from previous scans */
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 /* ignore if we're not scanning */
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 * enum bss_compare_mode - BSS compare mode
756 * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
757 * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
758 * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
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 * Note that with "hide_ssid", the function returns a match if
824 * the already-present BSS ("b") is a hidden SSID beacon for
825 * the new BSS ("a").
826 */
827
828 /* sort missing IE before (left of) present IE */
829 if (!ie1)
830 return -1;
831 if (!ie2)
832 return 1;
833
834 switch (mode) {
835 case BSS_CMP_HIDE_ZLEN:
836 /*
837 * In ZLEN mode we assume the BSS entry we're
838 * looking for has a zero-length SSID. So if
839 * the one we're looking at right now has that,
840 * return 0. Otherwise, return the difference
841 * in length, but since we're looking for the
842 * 0-length it's really equivalent to returning
843 * the length of the one we're looking at.
844 *
845 * No content comparison is needed as we assume
846 * the content length is zero.
847 */
848 return ie2[1];
849 case BSS_CMP_REGULAR:
850 default:
851 /* sort by length first, then by contents */
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 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */
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/* Returned bss is reference counted and must be cleaned up appropriately. */
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 /* Don't get expired BSS structs */
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 /* will sort of leak this BSS */
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 /* nothing to do */
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 /* not a hidden SSID */
1041 return true;
1042 }
1043
1044 /* This is the bad part ... */
1045
1046 list_for_each_entry(bss, &rdev->bss_list, list) {
1047 /*
1048 * we're iterating all the entries anyway, so take the
1049 * opportunity to validate the list length accounting
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 /* combine them */
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
1094static bool
1095cfg80211_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 /* Update IEs */
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 /* Override possible earlier Beacon frame IEs */
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 /* The known BSS struct is one of the probe
1124 * response members of a group, but we're
1125 * receiving a beacon (beacon_ies in the new
1126 * bss is used). This can only mean that the
1127 * AP changed its beacon from not having an
1128 * SSID to showing it, which is confusing so
1129 * drop this information.
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 /* Override IEs if they were from a beacon before */
1142 if (old == rcu_access_pointer(known->pub.ies))
1143 rcu_assign_pointer(known->pub.ies, new->pub.beacon_ies);
1144
1145 /* Assign beacon IEs to all sub entries */
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 /* don't update the signal if beacon was heard on
1163 * adjacent channel.
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/* Returned bss is reference counted and must be cleaned up appropriately. */
1182struct cfg80211_internal_bss *
1183cfg80211_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 * create a copy -- the "res" variable that is passed in
1213 * is allocated on the stack since it's not needed in the
1214 * more common case of an update
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 * Ok so we found a beacon, and don't have an entry. If
1248 * it's a beacon with hidden SSID, we might be in for an
1249 * expensive search for any probe responses that should
1250 * be grouped with this beacon for updates ...
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 /* This must be before the call to bss_ref_get */
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 * Update RX channel information based on the available frame payload
1293 * information. This is mainly for the 2.4 GHz band where frames can be received
1294 * from neighboring channels and the Beacon frames use the DSSS Parameter Set
1295 * element to indicate the current (transmitting) channel, but this might also
1296 * be needed on other bands if RX frequency does not match with the actual
1297 * operating channel of a BSS.
1298 */
1299static struct ieee80211_channel *
1300cfg80211_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 /* No channel information in frame payload */
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 * Better not allow unexpected channels when that could
1332 * be going beyond the 1-11 range (e.g., discovering
1333 * BSS on channel 12 when radio is configured for
1334 * channel 11.
1335 */
1336 return NULL;
1337 }
1338
1339 /* No match for the payload channel number - ignore it */
1340 return channel;
1341 }
1342
1343 if (scan_width == NL80211_BSS_CHAN_WIDTH_10 ||
1344 scan_width == NL80211_BSS_CHAN_WIDTH_5) {
1345 /*
1346 * Ignore channel number in 5 and 10 MHz channels where there
1347 * may not be an n:1 or 1:n mapping between frequencies and
1348 * channel numbers.
1349 */
1350 return channel;
1351 }
1352
1353 /*
1354 * Use the channel determined through the payload channel number
1355 * instead of the RX channel reported by the driver.
1356 */
1357 if (alt_channel->flags & IEEE80211_CHAN_DISABLED)
1358 return NULL;
1359 return alt_channel;
1360}
1361
1362/* Returned bss is reference counted and must be cleaned up appropriately. */
1363static struct cfg80211_bss *
1364cfg80211_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 * If we do not know here whether the IEs are from a Beacon or Probe
1410 * Response frame, we need to pick one of the options and only use it
1411 * with the driver that does not provide the full Beacon/Probe Response
1412 * frame. Use Beacon frame pointer to avoid indicating that this should
1413 * override the IEs pointer should we have received an earlier
1414 * indication of Probe Response data.
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 /* fall through */
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 /* this is a nontransmitting bss, we need to add it to
1455 * transmitting bss' list if it is not there
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 /* cfg80211_bss_update gives us a referenced result */
1466 return &res->pub;
1467}
1468
1469static 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 * If is is not the last subelement in current MBSSID IE or there isn't
1484 * a next MBSSID IE - profile is complete.
1485 */
1486 if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) ||
1487 !next_mbssid)
1488 return NULL;
1489
1490 /* For any length error, just return NULL */
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 * Check if the first element in the next sub element is a start
1506 * of a new profile
1507 */
1508 return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ?
1509 NULL : next_mbssid;
1510}
1511
1512size_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}
1539EXPORT_SYMBOL(cfg80211_merge_profile);
1540
1541static 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 /* not a valid BSS profile */
1585 continue;
1586 }
1587
1588 if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP ||
1589 sub->data[1] != 2) {
1590 /* The first element within the Nontransmitted
1591 * BSSID Profile is not the Nontransmitted
1592 * BSSID Capability element.
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 /* found a Nontransmitted BSSID Profile */
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 /* No valid Multiple BSSID-Index element */
1612 continue;
1613 }
1614
1615 if (seen_indices & BIT_ULL(mbssid_index_ie[2]))
1616 /* We don't support legacy split of a profile */
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
1653out:
1654 kfree(new_ie);
1655 kfree(profile);
1656}
1657
1658struct cfg80211_bss *
1659cfg80211_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}
1680EXPORT_SYMBOL(cfg80211_inform_bss_data);
1681
1682static void
1683cfg80211_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
1703static void
1704cfg80211_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 * It's not valid to have the MBSSID element before SSID
1729 * ignore if that happens - the code below assumes it is
1730 * after (while copying things inbetween).
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 /* generate new ie for nontrans BSS
1743 * 1. replace SSID with nontrans BSS' SSID
1744 * 2. skip MBSSID IE
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 /* copy the nontransmitted SSID */
1757 cpy_len = nontrans_ssid[1] + 2;
1758 memcpy(pos, nontrans_ssid, cpy_len);
1759 pos += cpy_len;
1760 /* copy the IEs between SSID and MBSSID */
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 /* copy the IEs after MBSSID */
1765 cpy_len = mbssid[1] + 2;
1766 memcpy(pos, mbssid + cpy_len, ((ie + ielen) - (mbssid + cpy_len)));
1767
1768 /* update ie */
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
1787out_free:
1788 kfree(new_ie);
1789}
1790
1791/* cfg80211_inform_bss_width_frame helper */
1792static struct cfg80211_bss *
1793cfg80211_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 /* cfg80211_bss_update gives us a referenced result */
1874 return &res->pub;
1875}
1876
1877struct cfg80211_bss *
1878cfg80211_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 /* process each non-transmitting bss */
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 /* check if the res has other nontransmitting bss which is not
1907 * in MBSSID IE
1908 */
1909 ies1 = rcu_access_pointer(res->ies);
1910
1911 /* go through nontrans_list, if the timestamp of the BSS is
1912 * earlier than the timestamp of the transmitting BSS then
1913 * update it
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}
1926EXPORT_SYMBOL(cfg80211_inform_bss_frame_data);
1927
1928void 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}
1942EXPORT_SYMBOL(cfg80211_ref_bss);
1943
1944void 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}
1958EXPORT_SYMBOL(cfg80211_put_bss);
1959
1960void 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++;
1986out:
1987 spin_unlock_bh(&rdev->bss_lock);
1988}
1989EXPORT_SYMBOL(cfg80211_unlink_bss);
1990
1991void 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}
2010EXPORT_SYMBOL(cfg80211_bss_iter);
2011
2012void 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 if (WARN_ON(cbss->pub.channel == chan))
2026 goto done;
2027
2028 /* use transmitting bss */
2029 if (cbss->pub.transmitted_bss)
2030 cbss = container_of(cbss->pub.transmitted_bss,
2031 struct cfg80211_internal_bss,
2032 pub);
2033
2034 cbss->pub.channel = chan;
2035
2036 list_for_each_entry(bss, &rdev->bss_list, list) {
2037 if (!cfg80211_bss_type_match(bss->pub.capability,
2038 bss->pub.channel->band,
2039 wdev->conn_bss_type))
2040 continue;
2041
2042 if (bss == cbss)
2043 continue;
2044
2045 if (!cmp_bss(&bss->pub, &cbss->pub, BSS_CMP_REGULAR)) {
2046 new = bss;
2047 break;
2048 }
2049 }
2050
2051 if (new) {
2052 /* to save time, update IEs for transmitting bss only */
2053 if (cfg80211_update_known_bss(rdev, cbss, new, false)) {
2054 new->pub.proberesp_ies = NULL;
2055 new->pub.beacon_ies = NULL;
2056 }
2057
2058 list_for_each_entry_safe(nontrans_bss, tmp,
2059 &new->pub.nontrans_list,
2060 nontrans_list) {
2061 bss = container_of(nontrans_bss,
2062 struct cfg80211_internal_bss, pub);
2063 if (__cfg80211_unlink_bss(rdev, bss))
2064 rdev->bss_generation++;
2065 }
2066
2067 WARN_ON(atomic_read(&new->hold));
2068 if (!WARN_ON(!__cfg80211_unlink_bss(rdev, new)))
2069 rdev->bss_generation++;
2070 }
2071
2072 rb_erase(&cbss->rbn, &rdev->bss_tree);
2073 rb_insert_bss(rdev, cbss);
2074 rdev->bss_generation++;
2075
2076 list_for_each_entry_safe(nontrans_bss, tmp,
2077 &cbss->pub.nontrans_list,
2078 nontrans_list) {
2079 bss = container_of(nontrans_bss,
2080 struct cfg80211_internal_bss, pub);
2081 bss->pub.channel = chan;
2082 rb_erase(&bss->rbn, &rdev->bss_tree);
2083 rb_insert_bss(rdev, bss);
2084 rdev->bss_generation++;
2085 }
2086
2087done:
2088 spin_unlock_bh(&rdev->bss_lock);
2089}
2090
2091#ifdef CONFIG_CFG80211_WEXT
2092static struct cfg80211_registered_device *
2093cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
2094{
2095 struct cfg80211_registered_device *rdev;
2096 struct net_device *dev;
2097
2098 ASSERT_RTNL();
2099
2100 dev = dev_get_by_index(net, ifindex);
2101 if (!dev)
2102 return ERR_PTR(-ENODEV);
2103 if (dev->ieee80211_ptr)
2104 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
2105 else
2106 rdev = ERR_PTR(-ENODEV);
2107 dev_put(dev);
2108 return rdev;
2109}
2110
2111int cfg80211_wext_siwscan(struct net_device *dev,
2112 struct iw_request_info *info,
2113 union iwreq_data *wrqu, char *extra)
2114{
2115 struct cfg80211_registered_device *rdev;
2116 struct wiphy *wiphy;
2117 struct iw_scan_req *wreq = NULL;
2118 struct cfg80211_scan_request *creq = NULL;
2119 int i, err, n_channels = 0;
2120 enum nl80211_band band;
2121
2122 if (!netif_running(dev))
2123 return -ENETDOWN;
2124
2125 if (wrqu->data.length == sizeof(struct iw_scan_req))
2126 wreq = (struct iw_scan_req *)extra;
2127
2128 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2129
2130 if (IS_ERR(rdev))
2131 return PTR_ERR(rdev);
2132
2133 if (rdev->scan_req || rdev->scan_msg) {
2134 err = -EBUSY;
2135 goto out;
2136 }
2137
2138 wiphy = &rdev->wiphy;
2139
2140 /* Determine number of channels, needed to allocate creq */
2141 if (wreq && wreq->num_channels)
2142 n_channels = wreq->num_channels;
2143 else
2144 n_channels = ieee80211_get_num_supported_channels(wiphy);
2145
2146 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
2147 n_channels * sizeof(void *),
2148 GFP_ATOMIC);
2149 if (!creq) {
2150 err = -ENOMEM;
2151 goto out;
2152 }
2153
2154 creq->wiphy = wiphy;
2155 creq->wdev = dev->ieee80211_ptr;
2156 /* SSIDs come after channels */
2157 creq->ssids = (void *)&creq->channels[n_channels];
2158 creq->n_channels = n_channels;
2159 creq->n_ssids = 1;
2160 creq->scan_start = jiffies;
2161
2162 /* translate "Scan on frequencies" request */
2163 i = 0;
2164 for (band = 0; band < NUM_NL80211_BANDS; band++) {
2165 int j;
2166
2167 if (!wiphy->bands[band])
2168 continue;
2169
2170 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
2171 /* ignore disabled channels */
2172 if (wiphy->bands[band]->channels[j].flags &
2173 IEEE80211_CHAN_DISABLED)
2174 continue;
2175
2176 /* If we have a wireless request structure and the
2177 * wireless request specifies frequencies, then search
2178 * for the matching hardware channel.
2179 */
2180 if (wreq && wreq->num_channels) {
2181 int k;
2182 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
2183 for (k = 0; k < wreq->num_channels; k++) {
2184 struct iw_freq *freq =
2185 &wreq->channel_list[k];
2186 int wext_freq =
2187 cfg80211_wext_freq(freq);
2188
2189 if (wext_freq == wiphy_freq)
2190 goto wext_freq_found;
2191 }
2192 goto wext_freq_not_found;
2193 }
2194
2195 wext_freq_found:
2196 creq->channels[i] = &wiphy->bands[band]->channels[j];
2197 i++;
2198 wext_freq_not_found: ;
2199 }
2200 }
2201 /* No channels found? */
2202 if (!i) {
2203 err = -EINVAL;
2204 goto out;
2205 }
2206
2207 /* Set real number of channels specified in creq->channels[] */
2208 creq->n_channels = i;
2209
2210 /* translate "Scan for SSID" request */
2211 if (wreq) {
2212 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
2213 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
2214 err = -EINVAL;
2215 goto out;
2216 }
2217 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
2218 creq->ssids[0].ssid_len = wreq->essid_len;
2219 }
2220 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
2221 creq->n_ssids = 0;
2222 }
2223
2224 for (i = 0; i < NUM_NL80211_BANDS; i++)
2225 if (wiphy->bands[i])
2226 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
2227
2228 eth_broadcast_addr(creq->bssid);
2229
2230 rdev->scan_req = creq;
2231 err = rdev_scan(rdev, creq);
2232 if (err) {
2233 rdev->scan_req = NULL;
2234 /* creq will be freed below */
2235 } else {
2236 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
2237 /* creq now owned by driver */
2238 creq = NULL;
2239 dev_hold(dev);
2240 }
2241 out:
2242 kfree(creq);
2243 return err;
2244}
2245EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
2246
2247static char *ieee80211_scan_add_ies(struct iw_request_info *info,
2248 const struct cfg80211_bss_ies *ies,
2249 char *current_ev, char *end_buf)
2250{
2251 const u8 *pos, *end, *next;
2252 struct iw_event iwe;
2253
2254 if (!ies)
2255 return current_ev;
2256
2257 /*
2258 * If needed, fragment the IEs buffer (at IE boundaries) into short
2259 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
2260 */
2261 pos = ies->data;
2262 end = pos + ies->len;
2263
2264 while (end - pos > IW_GENERIC_IE_MAX) {
2265 next = pos + 2 + pos[1];
2266 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
2267 next = next + 2 + next[1];
2268
2269 memset(&iwe, 0, sizeof(iwe));
2270 iwe.cmd = IWEVGENIE;
2271 iwe.u.data.length = next - pos;
2272 current_ev = iwe_stream_add_point_check(info, current_ev,
2273 end_buf, &iwe,
2274 (void *)pos);
2275 if (IS_ERR(current_ev))
2276 return current_ev;
2277 pos = next;
2278 }
2279
2280 if (end > pos) {
2281 memset(&iwe, 0, sizeof(iwe));
2282 iwe.cmd = IWEVGENIE;
2283 iwe.u.data.length = end - pos;
2284 current_ev = iwe_stream_add_point_check(info, current_ev,
2285 end_buf, &iwe,
2286 (void *)pos);
2287 if (IS_ERR(current_ev))
2288 return current_ev;
2289 }
2290
2291 return current_ev;
2292}
2293
2294static char *
2295ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
2296 struct cfg80211_internal_bss *bss, char *current_ev,
2297 char *end_buf)
2298{
2299 const struct cfg80211_bss_ies *ies;
2300 struct iw_event iwe;
2301 const u8 *ie;
2302 u8 buf[50];
2303 u8 *cfg, *p, *tmp;
2304 int rem, i, sig;
2305 bool ismesh = false;
2306
2307 memset(&iwe, 0, sizeof(iwe));
2308 iwe.cmd = SIOCGIWAP;
2309 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
2310 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
2311 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2312 IW_EV_ADDR_LEN);
2313 if (IS_ERR(current_ev))
2314 return current_ev;
2315
2316 memset(&iwe, 0, sizeof(iwe));
2317 iwe.cmd = SIOCGIWFREQ;
2318 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
2319 iwe.u.freq.e = 0;
2320 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2321 IW_EV_FREQ_LEN);
2322 if (IS_ERR(current_ev))
2323 return current_ev;
2324
2325 memset(&iwe, 0, sizeof(iwe));
2326 iwe.cmd = SIOCGIWFREQ;
2327 iwe.u.freq.m = bss->pub.channel->center_freq;
2328 iwe.u.freq.e = 6;
2329 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2330 IW_EV_FREQ_LEN);
2331 if (IS_ERR(current_ev))
2332 return current_ev;
2333
2334 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
2335 memset(&iwe, 0, sizeof(iwe));
2336 iwe.cmd = IWEVQUAL;
2337 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
2338 IW_QUAL_NOISE_INVALID |
2339 IW_QUAL_QUAL_UPDATED;
2340 switch (wiphy->signal_type) {
2341 case CFG80211_SIGNAL_TYPE_MBM:
2342 sig = bss->pub.signal / 100;
2343 iwe.u.qual.level = sig;
2344 iwe.u.qual.updated |= IW_QUAL_DBM;
2345 if (sig < -110) /* rather bad */
2346 sig = -110;
2347 else if (sig > -40) /* perfect */
2348 sig = -40;
2349 /* will give a range of 0 .. 70 */
2350 iwe.u.qual.qual = sig + 110;
2351 break;
2352 case CFG80211_SIGNAL_TYPE_UNSPEC:
2353 iwe.u.qual.level = bss->pub.signal;
2354 /* will give range 0 .. 100 */
2355 iwe.u.qual.qual = bss->pub.signal;
2356 break;
2357 default:
2358 /* not reached */
2359 break;
2360 }
2361 current_ev = iwe_stream_add_event_check(info, current_ev,
2362 end_buf, &iwe,
2363 IW_EV_QUAL_LEN);
2364 if (IS_ERR(current_ev))
2365 return current_ev;
2366 }
2367
2368 memset(&iwe, 0, sizeof(iwe));
2369 iwe.cmd = SIOCGIWENCODE;
2370 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
2371 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
2372 else
2373 iwe.u.data.flags = IW_ENCODE_DISABLED;
2374 iwe.u.data.length = 0;
2375 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
2376 &iwe, "");
2377 if (IS_ERR(current_ev))
2378 return current_ev;
2379
2380 rcu_read_lock();
2381 ies = rcu_dereference(bss->pub.ies);
2382 rem = ies->len;
2383 ie = ies->data;
2384
2385 while (rem >= 2) {
2386 /* invalid data */
2387 if (ie[1] > rem - 2)
2388 break;
2389
2390 switch (ie[0]) {
2391 case WLAN_EID_SSID:
2392 memset(&iwe, 0, sizeof(iwe));
2393 iwe.cmd = SIOCGIWESSID;
2394 iwe.u.data.length = ie[1];
2395 iwe.u.data.flags = 1;
2396 current_ev = iwe_stream_add_point_check(info,
2397 current_ev,
2398 end_buf, &iwe,
2399 (u8 *)ie + 2);
2400 if (IS_ERR(current_ev))
2401 goto unlock;
2402 break;
2403 case WLAN_EID_MESH_ID:
2404 memset(&iwe, 0, sizeof(iwe));
2405 iwe.cmd = SIOCGIWESSID;
2406 iwe.u.data.length = ie[1];
2407 iwe.u.data.flags = 1;
2408 current_ev = iwe_stream_add_point_check(info,
2409 current_ev,
2410 end_buf, &iwe,
2411 (u8 *)ie + 2);
2412 if (IS_ERR(current_ev))
2413 goto unlock;
2414 break;
2415 case WLAN_EID_MESH_CONFIG:
2416 ismesh = true;
2417 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
2418 break;
2419 cfg = (u8 *)ie + 2;
2420 memset(&iwe, 0, sizeof(iwe));
2421 iwe.cmd = IWEVCUSTOM;
2422 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
2423 "0x%02X", cfg[0]);
2424 iwe.u.data.length = strlen(buf);
2425 current_ev = iwe_stream_add_point_check(info,
2426 current_ev,
2427 end_buf,
2428 &iwe, buf);
2429 if (IS_ERR(current_ev))
2430 goto unlock;
2431 sprintf(buf, "Path Selection Metric ID: 0x%02X",
2432 cfg[1]);
2433 iwe.u.data.length = strlen(buf);
2434 current_ev = iwe_stream_add_point_check(info,
2435 current_ev,
2436 end_buf,
2437 &iwe, buf);
2438 if (IS_ERR(current_ev))
2439 goto unlock;
2440 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
2441 cfg[2]);
2442 iwe.u.data.length = strlen(buf);
2443 current_ev = iwe_stream_add_point_check(info,
2444 current_ev,
2445 end_buf,
2446 &iwe, buf);
2447 if (IS_ERR(current_ev))
2448 goto unlock;
2449 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
2450 iwe.u.data.length = strlen(buf);
2451 current_ev = iwe_stream_add_point_check(info,
2452 current_ev,
2453 end_buf,
2454 &iwe, buf);
2455 if (IS_ERR(current_ev))
2456 goto unlock;
2457 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
2458 iwe.u.data.length = strlen(buf);
2459 current_ev = iwe_stream_add_point_check(info,
2460 current_ev,
2461 end_buf,
2462 &iwe, buf);
2463 if (IS_ERR(current_ev))
2464 goto unlock;
2465 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
2466 iwe.u.data.length = strlen(buf);
2467 current_ev = iwe_stream_add_point_check(info,
2468 current_ev,
2469 end_buf,
2470 &iwe, buf);
2471 if (IS_ERR(current_ev))
2472 goto unlock;
2473 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
2474 iwe.u.data.length = strlen(buf);
2475 current_ev = iwe_stream_add_point_check(info,
2476 current_ev,
2477 end_buf,
2478 &iwe, buf);
2479 if (IS_ERR(current_ev))
2480 goto unlock;
2481 break;
2482 case WLAN_EID_SUPP_RATES:
2483 case WLAN_EID_EXT_SUPP_RATES:
2484 /* display all supported rates in readable format */
2485 p = current_ev + iwe_stream_lcp_len(info);
2486
2487 memset(&iwe, 0, sizeof(iwe));
2488 iwe.cmd = SIOCGIWRATE;
2489 /* Those two flags are ignored... */
2490 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
2491
2492 for (i = 0; i < ie[1]; i++) {
2493 iwe.u.bitrate.value =
2494 ((ie[i + 2] & 0x7f) * 500000);
2495 tmp = p;
2496 p = iwe_stream_add_value(info, current_ev, p,
2497 end_buf, &iwe,
2498 IW_EV_PARAM_LEN);
2499 if (p == tmp) {
2500 current_ev = ERR_PTR(-E2BIG);
2501 goto unlock;
2502 }
2503 }
2504 current_ev = p;
2505 break;
2506 }
2507 rem -= ie[1] + 2;
2508 ie += ie[1] + 2;
2509 }
2510
2511 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
2512 ismesh) {
2513 memset(&iwe, 0, sizeof(iwe));
2514 iwe.cmd = SIOCGIWMODE;
2515 if (ismesh)
2516 iwe.u.mode = IW_MODE_MESH;
2517 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
2518 iwe.u.mode = IW_MODE_MASTER;
2519 else
2520 iwe.u.mode = IW_MODE_ADHOC;
2521 current_ev = iwe_stream_add_event_check(info, current_ev,
2522 end_buf, &iwe,
2523 IW_EV_UINT_LEN);
2524 if (IS_ERR(current_ev))
2525 goto unlock;
2526 }
2527
2528 memset(&iwe, 0, sizeof(iwe));
2529 iwe.cmd = IWEVCUSTOM;
2530 sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
2531 iwe.u.data.length = strlen(buf);
2532 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
2533 &iwe, buf);
2534 if (IS_ERR(current_ev))
2535 goto unlock;
2536 memset(&iwe, 0, sizeof(iwe));
2537 iwe.cmd = IWEVCUSTOM;
2538 sprintf(buf, " Last beacon: %ums ago",
2539 elapsed_jiffies_msecs(bss->ts));
2540 iwe.u.data.length = strlen(buf);
2541 current_ev = iwe_stream_add_point_check(info, current_ev,
2542 end_buf, &iwe, buf);
2543 if (IS_ERR(current_ev))
2544 goto unlock;
2545
2546 current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
2547
2548 unlock:
2549 rcu_read_unlock();
2550 return current_ev;
2551}
2552
2553
2554static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
2555 struct iw_request_info *info,
2556 char *buf, size_t len)
2557{
2558 char *current_ev = buf;
2559 char *end_buf = buf + len;
2560 struct cfg80211_internal_bss *bss;
2561 int err = 0;
2562
2563 spin_lock_bh(&rdev->bss_lock);
2564 cfg80211_bss_expire(rdev);
2565
2566 list_for_each_entry(bss, &rdev->bss_list, list) {
2567 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
2568 err = -E2BIG;
2569 break;
2570 }
2571 current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
2572 current_ev, end_buf);
2573 if (IS_ERR(current_ev)) {
2574 err = PTR_ERR(current_ev);
2575 break;
2576 }
2577 }
2578 spin_unlock_bh(&rdev->bss_lock);
2579
2580 if (err)
2581 return err;
2582 return current_ev - buf;
2583}
2584
2585
2586int cfg80211_wext_giwscan(struct net_device *dev,
2587 struct iw_request_info *info,
2588 struct iw_point *data, char *extra)
2589{
2590 struct cfg80211_registered_device *rdev;
2591 int res;
2592
2593 if (!netif_running(dev))
2594 return -ENETDOWN;
2595
2596 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2597
2598 if (IS_ERR(rdev))
2599 return PTR_ERR(rdev);
2600
2601 if (rdev->scan_req || rdev->scan_msg)
2602 return -EAGAIN;
2603
2604 res = ieee80211_scan_results(rdev, info, extra, data->length);
2605 data->length = 0;
2606 if (res >= 0) {
2607 data->length = res;
2608 res = 0;
2609 }
2610
2611 return res;
2612}
2613EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan);
2614#endif