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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input
[linux-btrfs-devel.git] / net / wireless / scan.c
blob0fb1424104047ced0d99949be89388509e05fc5c
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/cfg80211-wext.h>
16 #include <net/iw_handler.h>
17 #include "core.h"
18 #include "nl80211.h"
19 #include "wext-compat.h"
20
21 #define IEEE80211_SCAN_RESULT_EXPIRE (15 * HZ)
22
23 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak)
24 {
25 struct cfg80211_scan_request *request;
26 struct net_device *dev;
27 #ifdef CONFIG_CFG80211_WEXT
28 union iwreq_data wrqu;
29 #endif
30
31 ASSERT_RDEV_LOCK(rdev);
32
33 request = rdev->scan_req;
34
35 if (!request)
36 return;
37
38 dev = request->dev;
39
40 /*
41 * This must be before sending the other events!
42 * Otherwise, wpa_supplicant gets completely confused with
43 * wext events.
44 */
45 cfg80211_sme_scan_done(dev);
46
47 if (request->aborted)
48 nl80211_send_scan_aborted(rdev, dev);
49 else
50 nl80211_send_scan_done(rdev, dev);
51
52 #ifdef CONFIG_CFG80211_WEXT
53 if (!request->aborted) {
54 memset(&wrqu, 0, sizeof(wrqu));
55
56 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
57 }
58 #endif
59
60 dev_put(dev);
61
62 rdev->scan_req = NULL;
63
64 /*
65 * OK. If this is invoked with "leak" then we can't
66 * free this ... but we've cleaned it up anyway. The
67 * driver failed to call the scan_done callback, so
68 * all bets are off, it might still be trying to use
69 * the scan request or not ... if it accesses the dev
70 * in there (it shouldn't anyway) then it may crash.
71 */
72 if (!leak)
73 kfree(request);
74 }
75
76 void __cfg80211_scan_done(struct work_struct *wk)
77 {
78 struct cfg80211_registered_device *rdev;
79
80 rdev = container_of(wk, struct cfg80211_registered_device,
81 scan_done_wk);
82
83 cfg80211_lock_rdev(rdev);
84 ___cfg80211_scan_done(rdev, false);
85 cfg80211_unlock_rdev(rdev);
86 }
87
88 void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
89 {
90 WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);
91
92 request->aborted = aborted;
93 queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk);
94 }
95 EXPORT_SYMBOL(cfg80211_scan_done);
96
97 void __cfg80211_sched_scan_results(struct work_struct *wk)
98 {
99 struct cfg80211_registered_device *rdev;
100
101 rdev = container_of(wk, struct cfg80211_registered_device,
102 sched_scan_results_wk);
103
104 mutex_lock(&rdev->sched_scan_mtx);
105
106 /* we don't have sched_scan_req anymore if the scan is stopping */
107 if (rdev->sched_scan_req)
108 nl80211_send_sched_scan_results(rdev,
109 rdev->sched_scan_req->dev);
110
111 mutex_unlock(&rdev->sched_scan_mtx);
112 }
113
114 void cfg80211_sched_scan_results(struct wiphy *wiphy)
115 {
116 /* ignore if we're not scanning */
117 if (wiphy_to_dev(wiphy)->sched_scan_req)
118 queue_work(cfg80211_wq,
119 &wiphy_to_dev(wiphy)->sched_scan_results_wk);
120 }
121 EXPORT_SYMBOL(cfg80211_sched_scan_results);
122
123 void cfg80211_sched_scan_stopped(struct wiphy *wiphy)
124 {
125 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
126
127 mutex_lock(&rdev->sched_scan_mtx);
128 __cfg80211_stop_sched_scan(rdev, true);
129 mutex_unlock(&rdev->sched_scan_mtx);
130 }
131 EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
132
133 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
134 bool driver_initiated)
135 {
136 struct net_device *dev;
137
138 lockdep_assert_held(&rdev->sched_scan_mtx);
139
140 if (!rdev->sched_scan_req)
141 return -ENOENT;
142
143 dev = rdev->sched_scan_req->dev;
144
145 if (!driver_initiated) {
146 int err = rdev->ops->sched_scan_stop(&rdev->wiphy, dev);
147 if (err)
148 return err;
149 }
150
151 nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED);
152
153 kfree(rdev->sched_scan_req);
154 rdev->sched_scan_req = NULL;
155
156 return 0;
157 }
158
159 static void bss_release(struct kref *ref)
160 {
161 struct cfg80211_internal_bss *bss;
162
163 bss = container_of(ref, struct cfg80211_internal_bss, ref);
164 if (bss->pub.free_priv)
165 bss->pub.free_priv(&bss->pub);
166
167 if (bss->beacon_ies_allocated)
168 kfree(bss->pub.beacon_ies);
169 if (bss->proberesp_ies_allocated)
170 kfree(bss->pub.proberesp_ies);
171
172 BUG_ON(atomic_read(&bss->hold));
173
174 kfree(bss);
175 }
176
177 /* must hold dev->bss_lock! */
178 void cfg80211_bss_age(struct cfg80211_registered_device *dev,
179 unsigned long age_secs)
180 {
181 struct cfg80211_internal_bss *bss;
182 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
183
184 list_for_each_entry(bss, &dev->bss_list, list) {
185 bss->ts -= age_jiffies;
186 }
187 }
188
189 /* must hold dev->bss_lock! */
190 static void __cfg80211_unlink_bss(struct cfg80211_registered_device *dev,
191 struct cfg80211_internal_bss *bss)
192 {
193 list_del_init(&bss->list);
194 rb_erase(&bss->rbn, &dev->bss_tree);
195 kref_put(&bss->ref, bss_release);
196 }
197
198 /* must hold dev->bss_lock! */
199 void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
200 {
201 struct cfg80211_internal_bss *bss, *tmp;
202 bool expired = false;
203
204 list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
205 if (atomic_read(&bss->hold))
206 continue;
207 if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE))
208 continue;
209 __cfg80211_unlink_bss(dev, bss);
210 expired = true;
211 }
212
213 if (expired)
214 dev->bss_generation++;
215 }
216
217 const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len)
218 {
219 while (len > 2 && ies[0] != eid) {
220 len -= ies[1] + 2;
221 ies += ies[1] + 2;
222 }
223 if (len < 2)
224 return NULL;
225 if (len < 2 + ies[1])
226 return NULL;
227 return ies;
228 }
229 EXPORT_SYMBOL(cfg80211_find_ie);
230
231 const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type,
232 const u8 *ies, int len)
233 {
234 struct ieee80211_vendor_ie *ie;
235 const u8 *pos = ies, *end = ies + len;
236 int ie_oui;
237
238 while (pos < end) {
239 pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos,
240 end - pos);
241 if (!pos)
242 return NULL;
243
244 if (end - pos < sizeof(*ie))
245 return NULL;
246
247 ie = (struct ieee80211_vendor_ie *)pos;
248 ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2];
249 if (ie_oui == oui && ie->oui_type == oui_type)
250 return pos;
251
252 pos += 2 + ie->len;
253 }
254 return NULL;
255 }
256 EXPORT_SYMBOL(cfg80211_find_vendor_ie);
257
258 static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
259 {
260 const u8 *ie1 = cfg80211_find_ie(num, ies1, len1);
261 const u8 *ie2 = cfg80211_find_ie(num, ies2, len2);
262 int r;
263
264 if (!ie1 && !ie2)
265 return 0;
266 if (!ie1 || !ie2)
267 return -1;
268
269 r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1]));
270 if (r == 0 && ie1[1] != ie2[1])
271 return ie2[1] - ie1[1];
272 return r;
273 }
274
275 static bool is_bss(struct cfg80211_bss *a,
276 const u8 *bssid,
277 const u8 *ssid, size_t ssid_len)
278 {
279 const u8 *ssidie;
280
281 if (bssid && compare_ether_addr(a->bssid, bssid))
282 return false;
283
284 if (!ssid)
285 return true;
286
287 ssidie = cfg80211_find_ie(WLAN_EID_SSID,
288 a->information_elements,
289 a->len_information_elements);
290 if (!ssidie)
291 return false;
292 if (ssidie[1] != ssid_len)
293 return false;
294 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
295 }
296
297 static bool is_mesh_bss(struct cfg80211_bss *a)
298 {
299 const u8 *ie;
300
301 if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
302 return false;
303
304 ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
305 a->information_elements,
306 a->len_information_elements);
307 if (!ie)
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
316 return true;
317 }
318
319 static bool is_mesh(struct cfg80211_bss *a,
320 const u8 *meshid, size_t meshidlen,
321 const u8 *meshcfg)
322 {
323 const u8 *ie;
324
325 if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
326 return false;
327
328 ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
329 a->information_elements,
330 a->len_information_elements);
331 if (!ie)
332 return false;
333 if (ie[1] != meshidlen)
334 return false;
335 if (memcmp(ie + 2, meshid, meshidlen))
336 return false;
337
338 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
339 a->information_elements,
340 a->len_information_elements);
341 if (!ie)
342 return false;
343 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
344 return false;
345
346 /*
347 * Ignore mesh capability (last two bytes of the IE) when
348 * comparing since that may differ between stations taking
349 * part in the same mesh.
350 */
351 return memcmp(ie + 2, meshcfg,
352 sizeof(struct ieee80211_meshconf_ie) - 2) == 0;
353 }
354
355 static int cmp_bss(struct cfg80211_bss *a,
356 struct cfg80211_bss *b)
357 {
358 int r;
359
360 if (a->channel != b->channel)
361 return b->channel->center_freq - a->channel->center_freq;
362
363 if (is_mesh_bss(a) && is_mesh_bss(b)) {
364 r = cmp_ies(WLAN_EID_MESH_ID,
365 a->information_elements,
366 a->len_information_elements,
367 b->information_elements,
368 b->len_information_elements);
369 if (r)
370 return r;
371 return cmp_ies(WLAN_EID_MESH_CONFIG,
372 a->information_elements,
373 a->len_information_elements,
374 b->information_elements,
375 b->len_information_elements);
376 }
377
378 r = memcmp(a->bssid, b->bssid, ETH_ALEN);
379 if (r)
380 return r;
381
382 return cmp_ies(WLAN_EID_SSID,
383 a->information_elements,
384 a->len_information_elements,
385 b->information_elements,
386 b->len_information_elements);
387 }
388
389 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
390 struct ieee80211_channel *channel,
391 const u8 *bssid,
392 const u8 *ssid, size_t ssid_len,
393 u16 capa_mask, u16 capa_val)
394 {
395 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
396 struct cfg80211_internal_bss *bss, *res = NULL;
397 unsigned long now = jiffies;
398
399 spin_lock_bh(&dev->bss_lock);
400
401 list_for_each_entry(bss, &dev->bss_list, list) {
402 if ((bss->pub.capability & capa_mask) != capa_val)
403 continue;
404 if (channel && bss->pub.channel != channel)
405 continue;
406 /* Don't get expired BSS structs */
407 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
408 !atomic_read(&bss->hold))
409 continue;
410 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
411 res = bss;
412 kref_get(&res->ref);
413 break;
414 }
415 }
416
417 spin_unlock_bh(&dev->bss_lock);
418 if (!res)
419 return NULL;
420 return &res->pub;
421 }
422 EXPORT_SYMBOL(cfg80211_get_bss);
423
424 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
425 struct ieee80211_channel *channel,
426 const u8 *meshid, size_t meshidlen,
427 const u8 *meshcfg)
428 {
429 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
430 struct cfg80211_internal_bss *bss, *res = NULL;
431
432 spin_lock_bh(&dev->bss_lock);
433
434 list_for_each_entry(bss, &dev->bss_list, list) {
435 if (channel && bss->pub.channel != channel)
436 continue;
437 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
438 res = bss;
439 kref_get(&res->ref);
440 break;
441 }
442 }
443
444 spin_unlock_bh(&dev->bss_lock);
445 if (!res)
446 return NULL;
447 return &res->pub;
448 }
449 EXPORT_SYMBOL(cfg80211_get_mesh);
450
451
452 static void rb_insert_bss(struct cfg80211_registered_device *dev,
453 struct cfg80211_internal_bss *bss)
454 {
455 struct rb_node **p = &dev->bss_tree.rb_node;
456 struct rb_node *parent = NULL;
457 struct cfg80211_internal_bss *tbss;
458 int cmp;
459
460 while (*p) {
461 parent = *p;
462 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
463
464 cmp = cmp_bss(&bss->pub, &tbss->pub);
465
466 if (WARN_ON(!cmp)) {
467 /* will sort of leak this BSS */
468 return;
469 }
470
471 if (cmp < 0)
472 p = &(*p)->rb_left;
473 else
474 p = &(*p)->rb_right;
475 }
476
477 rb_link_node(&bss->rbn, parent, p);
478 rb_insert_color(&bss->rbn, &dev->bss_tree);
479 }
480
481 static struct cfg80211_internal_bss *
482 rb_find_bss(struct cfg80211_registered_device *dev,
483 struct cfg80211_internal_bss *res)
484 {
485 struct rb_node *n = dev->bss_tree.rb_node;
486 struct cfg80211_internal_bss *bss;
487 int r;
488
489 while (n) {
490 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
491 r = cmp_bss(&res->pub, &bss->pub);
492
493 if (r == 0)
494 return bss;
495 else if (r < 0)
496 n = n->rb_left;
497 else
498 n = n->rb_right;
499 }
500
501 return NULL;
502 }
503
504 static struct cfg80211_internal_bss *
505 cfg80211_bss_update(struct cfg80211_registered_device *dev,
506 struct cfg80211_internal_bss *res)
507 {
508 struct cfg80211_internal_bss *found = NULL;
509
510 /*
511 * The reference to "res" is donated to this function.
512 */
513
514 if (WARN_ON(!res->pub.channel)) {
515 kref_put(&res->ref, bss_release);
516 return NULL;
517 }
518
519 res->ts = jiffies;
520
521 spin_lock_bh(&dev->bss_lock);
522
523 found = rb_find_bss(dev, res);
524
525 if (found) {
526 found->pub.beacon_interval = res->pub.beacon_interval;
527 found->pub.tsf = res->pub.tsf;
528 found->pub.signal = res->pub.signal;
529 found->pub.capability = res->pub.capability;
530 found->ts = res->ts;
531
532 /* Update IEs */
533 if (res->pub.proberesp_ies) {
534 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
535 size_t ielen = res->pub.len_proberesp_ies;
536
537 if (found->pub.proberesp_ies &&
538 !found->proberesp_ies_allocated &&
539 ksize(found) >= used + ielen) {
540 memcpy(found->pub.proberesp_ies,
541 res->pub.proberesp_ies, ielen);
542 found->pub.len_proberesp_ies = ielen;
543 } else {
544 u8 *ies = found->pub.proberesp_ies;
545
546 if (found->proberesp_ies_allocated)
547 ies = krealloc(ies, ielen, GFP_ATOMIC);
548 else
549 ies = kmalloc(ielen, GFP_ATOMIC);
550
551 if (ies) {
552 memcpy(ies, res->pub.proberesp_ies,
553 ielen);
554 found->proberesp_ies_allocated = true;
555 found->pub.proberesp_ies = ies;
556 found->pub.len_proberesp_ies = ielen;
557 }
558 }
559
560 /* Override possible earlier Beacon frame IEs */
561 found->pub.information_elements =
562 found->pub.proberesp_ies;
563 found->pub.len_information_elements =
564 found->pub.len_proberesp_ies;
565 }
566 if (res->pub.beacon_ies) {
567 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
568 size_t ielen = res->pub.len_beacon_ies;
569 bool information_elements_is_beacon_ies =
570 (found->pub.information_elements ==
571 found->pub.beacon_ies);
572
573 if (found->pub.beacon_ies &&
574 !found->beacon_ies_allocated &&
575 ksize(found) >= used + ielen) {
576 memcpy(found->pub.beacon_ies,
577 res->pub.beacon_ies, ielen);
578 found->pub.len_beacon_ies = ielen;
579 } else {
580 u8 *ies = found->pub.beacon_ies;
581
582 if (found->beacon_ies_allocated)
583 ies = krealloc(ies, ielen, GFP_ATOMIC);
584 else
585 ies = kmalloc(ielen, GFP_ATOMIC);
586
587 if (ies) {
588 memcpy(ies, res->pub.beacon_ies,
589 ielen);
590 found->beacon_ies_allocated = true;
591 found->pub.beacon_ies = ies;
592 found->pub.len_beacon_ies = ielen;
593 }
594 }
595
596 /* Override IEs if they were from a beacon before */
597 if (information_elements_is_beacon_ies) {
598 found->pub.information_elements =
599 found->pub.beacon_ies;
600 found->pub.len_information_elements =
601 found->pub.len_beacon_ies;
602 }
603 }
604
605 kref_put(&res->ref, bss_release);
606 } else {
607 /* this "consumes" the reference */
608 list_add_tail(&res->list, &dev->bss_list);
609 rb_insert_bss(dev, res);
610 found = res;
611 }
612
613 dev->bss_generation++;
614 spin_unlock_bh(&dev->bss_lock);
615
616 kref_get(&found->ref);
617 return found;
618 }
619
620 struct cfg80211_bss*
621 cfg80211_inform_bss(struct wiphy *wiphy,
622 struct ieee80211_channel *channel,
623 const u8 *bssid,
624 u64 timestamp, u16 capability, u16 beacon_interval,
625 const u8 *ie, size_t ielen,
626 s32 signal, gfp_t gfp)
627 {
628 struct cfg80211_internal_bss *res;
629 size_t privsz;
630
631 if (WARN_ON(!wiphy))
632 return NULL;
633
634 privsz = wiphy->bss_priv_size;
635
636 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
637 (signal < 0 || signal > 100)))
638 return NULL;
639
640 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
641 if (!res)
642 return NULL;
643
644 memcpy(res->pub.bssid, bssid, ETH_ALEN);
645 res->pub.channel = channel;
646 res->pub.signal = signal;
647 res->pub.tsf = timestamp;
648 res->pub.beacon_interval = beacon_interval;
649 res->pub.capability = capability;
650 /*
651 * Since we do not know here whether the IEs are from a Beacon or Probe
652 * Response frame, we need to pick one of the options and only use it
653 * with the driver that does not provide the full Beacon/Probe Response
654 * frame. Use Beacon frame pointer to avoid indicating that this should
655 * override the information_elements pointer should we have received an
656 * earlier indication of Probe Response data.
657 *
658 * The initial buffer for the IEs is allocated with the BSS entry and
659 * is located after the private area.
660 */
661 res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz;
662 memcpy(res->pub.beacon_ies, ie, ielen);
663 res->pub.len_beacon_ies = ielen;
664 res->pub.information_elements = res->pub.beacon_ies;
665 res->pub.len_information_elements = res->pub.len_beacon_ies;
666
667 kref_init(&res->ref);
668
669 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
670 if (!res)
671 return NULL;
672
673 if (res->pub.capability & WLAN_CAPABILITY_ESS)
674 regulatory_hint_found_beacon(wiphy, channel, gfp);
675
676 /* cfg80211_bss_update gives us a referenced result */
677 return &res->pub;
678 }
679 EXPORT_SYMBOL(cfg80211_inform_bss);
680
681 struct cfg80211_bss *
682 cfg80211_inform_bss_frame(struct wiphy *wiphy,
683 struct ieee80211_channel *channel,
684 struct ieee80211_mgmt *mgmt, size_t len,
685 s32 signal, gfp_t gfp)
686 {
687 struct cfg80211_internal_bss *res;
688 size_t ielen = len - offsetof(struct ieee80211_mgmt,
689 u.probe_resp.variable);
690 size_t privsz;
691
692 if (WARN_ON(!mgmt))
693 return NULL;
694
695 if (WARN_ON(!wiphy))
696 return NULL;
697
698 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
699 (signal < 0 || signal > 100)))
700 return NULL;
701
702 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
703 return NULL;
704
705 privsz = wiphy->bss_priv_size;
706
707 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
708 if (!res)
709 return NULL;
710
711 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
712 res->pub.channel = channel;
713 res->pub.signal = signal;
714 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
715 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
716 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
717 /*
718 * The initial buffer for the IEs is allocated with the BSS entry and
719 * is located after the private area.
720 */
721 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
722 res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz;
723 memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable,
724 ielen);
725 res->pub.len_proberesp_ies = ielen;
726 res->pub.information_elements = res->pub.proberesp_ies;
727 res->pub.len_information_elements = res->pub.len_proberesp_ies;
728 } else {
729 res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz;
730 memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen);
731 res->pub.len_beacon_ies = ielen;
732 res->pub.information_elements = res->pub.beacon_ies;
733 res->pub.len_information_elements = res->pub.len_beacon_ies;
734 }
735
736 kref_init(&res->ref);
737
738 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
739 if (!res)
740 return NULL;
741
742 if (res->pub.capability & WLAN_CAPABILITY_ESS)
743 regulatory_hint_found_beacon(wiphy, channel, gfp);
744
745 /* cfg80211_bss_update gives us a referenced result */
746 return &res->pub;
747 }
748 EXPORT_SYMBOL(cfg80211_inform_bss_frame);
749
750 void cfg80211_put_bss(struct cfg80211_bss *pub)
751 {
752 struct cfg80211_internal_bss *bss;
753
754 if (!pub)
755 return;
756
757 bss = container_of(pub, struct cfg80211_internal_bss, pub);
758 kref_put(&bss->ref, bss_release);
759 }
760 EXPORT_SYMBOL(cfg80211_put_bss);
761
762 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
763 {
764 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
765 struct cfg80211_internal_bss *bss;
766
767 if (WARN_ON(!pub))
768 return;
769
770 bss = container_of(pub, struct cfg80211_internal_bss, pub);
771
772 spin_lock_bh(&dev->bss_lock);
773 if (!list_empty(&bss->list)) {
774 __cfg80211_unlink_bss(dev, bss);
775 dev->bss_generation++;
776 }
777 spin_unlock_bh(&dev->bss_lock);
778 }
779 EXPORT_SYMBOL(cfg80211_unlink_bss);
780
781 #ifdef CONFIG_CFG80211_WEXT
782 int cfg80211_wext_siwscan(struct net_device *dev,
783 struct iw_request_info *info,
784 union iwreq_data *wrqu, char *extra)
785 {
786 struct cfg80211_registered_device *rdev;
787 struct wiphy *wiphy;
788 struct iw_scan_req *wreq = NULL;
789 struct cfg80211_scan_request *creq = NULL;
790 int i, err, n_channels = 0;
791 enum ieee80211_band band;
792
793 if (!netif_running(dev))
794 return -ENETDOWN;
795
796 if (wrqu->data.length == sizeof(struct iw_scan_req))
797 wreq = (struct iw_scan_req *)extra;
798
799 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
800
801 if (IS_ERR(rdev))
802 return PTR_ERR(rdev);
803
804 if (rdev->scan_req) {
805 err = -EBUSY;
806 goto out;
807 }
808
809 wiphy = &rdev->wiphy;
810
811 /* Determine number of channels, needed to allocate creq */
812 if (wreq && wreq->num_channels)
813 n_channels = wreq->num_channels;
814 else {
815 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
816 if (wiphy->bands[band])
817 n_channels += wiphy->bands[band]->n_channels;
818 }
819
820 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
821 n_channels * sizeof(void *),
822 GFP_ATOMIC);
823 if (!creq) {
824 err = -ENOMEM;
825 goto out;
826 }
827
828 creq->wiphy = wiphy;
829 creq->dev = dev;
830 /* SSIDs come after channels */
831 creq->ssids = (void *)&creq->channels[n_channels];
832 creq->n_channels = n_channels;
833 creq->n_ssids = 1;
834
835 /* translate "Scan on frequencies" request */
836 i = 0;
837 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
838 int j;
839
840 if (!wiphy->bands[band])
841 continue;
842
843 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
844 /* ignore disabled channels */
845 if (wiphy->bands[band]->channels[j].flags &
846 IEEE80211_CHAN_DISABLED)
847 continue;
848
849 /* If we have a wireless request structure and the
850 * wireless request specifies frequencies, then search
851 * for the matching hardware channel.
852 */
853 if (wreq && wreq->num_channels) {
854 int k;
855 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
856 for (k = 0; k < wreq->num_channels; k++) {
857 int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]);
858 if (wext_freq == wiphy_freq)
859 goto wext_freq_found;
860 }
861 goto wext_freq_not_found;
862 }
863
864 wext_freq_found:
865 creq->channels[i] = &wiphy->bands[band]->channels[j];
866 i++;
867 wext_freq_not_found: ;
868 }
869 }
870 /* No channels found? */
871 if (!i) {
872 err = -EINVAL;
873 goto out;
874 }
875
876 /* Set real number of channels specified in creq->channels[] */
877 creq->n_channels = i;
878
879 /* translate "Scan for SSID" request */
880 if (wreq) {
881 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
882 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
883 err = -EINVAL;
884 goto out;
885 }
886 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
887 creq->ssids[0].ssid_len = wreq->essid_len;
888 }
889 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
890 creq->n_ssids = 0;
891 }
892
893 for (i = 0; i < IEEE80211_NUM_BANDS; i++)
894 if (wiphy->bands[i])
895 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
896
897 rdev->scan_req = creq;
898 err = rdev->ops->scan(wiphy, dev, creq);
899 if (err) {
900 rdev->scan_req = NULL;
901 /* creq will be freed below */
902 } else {
903 nl80211_send_scan_start(rdev, dev);
904 /* creq now owned by driver */
905 creq = NULL;
906 dev_hold(dev);
907 }
908 out:
909 kfree(creq);
910 cfg80211_unlock_rdev(rdev);
911 return err;
912 }
913 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
914
915 static void ieee80211_scan_add_ies(struct iw_request_info *info,
916 struct cfg80211_bss *bss,
917 char **current_ev, char *end_buf)
918 {
919 u8 *pos, *end, *next;
920 struct iw_event iwe;
921
922 if (!bss->information_elements ||
923 !bss->len_information_elements)
924 return;
925
926 /*
927 * If needed, fragment the IEs buffer (at IE boundaries) into short
928 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
929 */
930 pos = bss->information_elements;
931 end = pos + bss->len_information_elements;
932
933 while (end - pos > IW_GENERIC_IE_MAX) {
934 next = pos + 2 + pos[1];
935 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
936 next = next + 2 + next[1];
937
938 memset(&iwe, 0, sizeof(iwe));
939 iwe.cmd = IWEVGENIE;
940 iwe.u.data.length = next - pos;
941 *current_ev = iwe_stream_add_point(info, *current_ev,
942 end_buf, &iwe, pos);
943
944 pos = next;
945 }
946
947 if (end > pos) {
948 memset(&iwe, 0, sizeof(iwe));
949 iwe.cmd = IWEVGENIE;
950 iwe.u.data.length = end - pos;
951 *current_ev = iwe_stream_add_point(info, *current_ev,
952 end_buf, &iwe, pos);
953 }
954 }
955
956 static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
957 {
958 unsigned long end = jiffies;
959
960 if (end >= start)
961 return jiffies_to_msecs(end - start);
962
963 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
964 }
965
966 static char *
967 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
968 struct cfg80211_internal_bss *bss, char *current_ev,
969 char *end_buf)
970 {
971 struct iw_event iwe;
972 u8 *buf, *cfg, *p;
973 u8 *ie = bss->pub.information_elements;
974 int rem = bss->pub.len_information_elements, i, sig;
975 bool ismesh = false;
976
977 memset(&iwe, 0, sizeof(iwe));
978 iwe.cmd = SIOCGIWAP;
979 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
980 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
981 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
982 IW_EV_ADDR_LEN);
983
984 memset(&iwe, 0, sizeof(iwe));
985 iwe.cmd = SIOCGIWFREQ;
986 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
987 iwe.u.freq.e = 0;
988 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
989 IW_EV_FREQ_LEN);
990
991 memset(&iwe, 0, sizeof(iwe));
992 iwe.cmd = SIOCGIWFREQ;
993 iwe.u.freq.m = bss->pub.channel->center_freq;
994 iwe.u.freq.e = 6;
995 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
996 IW_EV_FREQ_LEN);
997
998 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
999 memset(&iwe, 0, sizeof(iwe));
1000 iwe.cmd = IWEVQUAL;
1001 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
1002 IW_QUAL_NOISE_INVALID |
1003 IW_QUAL_QUAL_UPDATED;
1004 switch (wiphy->signal_type) {
1005 case CFG80211_SIGNAL_TYPE_MBM:
1006 sig = bss->pub.signal / 100;
1007 iwe.u.qual.level = sig;
1008 iwe.u.qual.updated |= IW_QUAL_DBM;
1009 if (sig < -110) /* rather bad */
1010 sig = -110;
1011 else if (sig > -40) /* perfect */
1012 sig = -40;
1013 /* will give a range of 0 .. 70 */
1014 iwe.u.qual.qual = sig + 110;
1015 break;
1016 case CFG80211_SIGNAL_TYPE_UNSPEC:
1017 iwe.u.qual.level = bss->pub.signal;
1018 /* will give range 0 .. 100 */
1019 iwe.u.qual.qual = bss->pub.signal;
1020 break;
1021 default:
1022 /* not reached */
1023 break;
1024 }
1025 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1026 &iwe, IW_EV_QUAL_LEN);
1027 }
1028
1029 memset(&iwe, 0, sizeof(iwe));
1030 iwe.cmd = SIOCGIWENCODE;
1031 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
1032 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1033 else
1034 iwe.u.data.flags = IW_ENCODE_DISABLED;
1035 iwe.u.data.length = 0;
1036 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1037 &iwe, "");
1038
1039 while (rem >= 2) {
1040 /* invalid data */
1041 if (ie[1] > rem - 2)
1042 break;
1043
1044 switch (ie[0]) {
1045 case WLAN_EID_SSID:
1046 memset(&iwe, 0, sizeof(iwe));
1047 iwe.cmd = SIOCGIWESSID;
1048 iwe.u.data.length = ie[1];
1049 iwe.u.data.flags = 1;
1050 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1051 &iwe, ie + 2);
1052 break;
1053 case WLAN_EID_MESH_ID:
1054 memset(&iwe, 0, sizeof(iwe));
1055 iwe.cmd = SIOCGIWESSID;
1056 iwe.u.data.length = ie[1];
1057 iwe.u.data.flags = 1;
1058 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1059 &iwe, ie + 2);
1060 break;
1061 case WLAN_EID_MESH_CONFIG:
1062 ismesh = true;
1063 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
1064 break;
1065 buf = kmalloc(50, GFP_ATOMIC);
1066 if (!buf)
1067 break;
1068 cfg = ie + 2;
1069 memset(&iwe, 0, sizeof(iwe));
1070 iwe.cmd = IWEVCUSTOM;
1071 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
1072 "0x%02X", cfg[0]);
1073 iwe.u.data.length = strlen(buf);
1074 current_ev = iwe_stream_add_point(info, current_ev,
1075 end_buf,
1076 &iwe, buf);
1077 sprintf(buf, "Path Selection Metric ID: 0x%02X",
1078 cfg[1]);
1079 iwe.u.data.length = strlen(buf);
1080 current_ev = iwe_stream_add_point(info, current_ev,
1081 end_buf,
1082 &iwe, buf);
1083 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
1084 cfg[2]);
1085 iwe.u.data.length = strlen(buf);
1086 current_ev = iwe_stream_add_point(info, current_ev,
1087 end_buf,
1088 &iwe, buf);
1089 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
1090 iwe.u.data.length = strlen(buf);
1091 current_ev = iwe_stream_add_point(info, current_ev,
1092 end_buf,
1093 &iwe, buf);
1094 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
1095 iwe.u.data.length = strlen(buf);
1096 current_ev = iwe_stream_add_point(info, current_ev,
1097 end_buf,
1098 &iwe, buf);
1099 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
1100 iwe.u.data.length = strlen(buf);
1101 current_ev = iwe_stream_add_point(info, current_ev,
1102 end_buf,
1103 &iwe, buf);
1104 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
1105 iwe.u.data.length = strlen(buf);
1106 current_ev = iwe_stream_add_point(info, current_ev,
1107 end_buf,
1108 &iwe, buf);
1109 kfree(buf);
1110 break;
1111 case WLAN_EID_SUPP_RATES:
1112 case WLAN_EID_EXT_SUPP_RATES:
1113 /* display all supported rates in readable format */
1114 p = current_ev + iwe_stream_lcp_len(info);
1115
1116 memset(&iwe, 0, sizeof(iwe));
1117 iwe.cmd = SIOCGIWRATE;
1118 /* Those two flags are ignored... */
1119 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
1120
1121 for (i = 0; i < ie[1]; i++) {
1122 iwe.u.bitrate.value =
1123 ((ie[i + 2] & 0x7f) * 500000);
1124 p = iwe_stream_add_value(info, current_ev, p,
1125 end_buf, &iwe, IW_EV_PARAM_LEN);
1126 }
1127 current_ev = p;
1128 break;
1129 }
1130 rem -= ie[1] + 2;
1131 ie += ie[1] + 2;
1132 }
1133
1134 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
1135 ismesh) {
1136 memset(&iwe, 0, sizeof(iwe));
1137 iwe.cmd = SIOCGIWMODE;
1138 if (ismesh)
1139 iwe.u.mode = IW_MODE_MESH;
1140 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
1141 iwe.u.mode = IW_MODE_MASTER;
1142 else
1143 iwe.u.mode = IW_MODE_ADHOC;
1144 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1145 &iwe, IW_EV_UINT_LEN);
1146 }
1147
1148 buf = kmalloc(30, GFP_ATOMIC);
1149 if (buf) {
1150 memset(&iwe, 0, sizeof(iwe));
1151 iwe.cmd = IWEVCUSTOM;
1152 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
1153 iwe.u.data.length = strlen(buf);
1154 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1155 &iwe, buf);
1156 memset(&iwe, 0, sizeof(iwe));
1157 iwe.cmd = IWEVCUSTOM;
1158 sprintf(buf, " Last beacon: %ums ago",
1159 elapsed_jiffies_msecs(bss->ts));
1160 iwe.u.data.length = strlen(buf);
1161 current_ev = iwe_stream_add_point(info, current_ev,
1162 end_buf, &iwe, buf);
1163 kfree(buf);
1164 }
1165
1166 ieee80211_scan_add_ies(info, &bss->pub, &current_ev, end_buf);
1167
1168 return current_ev;
1169 }
1170
1171
1172 static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
1173 struct iw_request_info *info,
1174 char *buf, size_t len)
1175 {
1176 char *current_ev = buf;
1177 char *end_buf = buf + len;
1178 struct cfg80211_internal_bss *bss;
1179
1180 spin_lock_bh(&dev->bss_lock);
1181 cfg80211_bss_expire(dev);
1182
1183 list_for_each_entry(bss, &dev->bss_list, list) {
1184 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
1185 spin_unlock_bh(&dev->bss_lock);
1186 return -E2BIG;
1187 }
1188 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
1189 current_ev, end_buf);
1190 }
1191 spin_unlock_bh(&dev->bss_lock);
1192 return current_ev - buf;
1193 }
1194
1195
1196 int cfg80211_wext_giwscan(struct net_device *dev,
1197 struct iw_request_info *info,
1198 struct iw_point *data, char *extra)
1199 {
1200 struct cfg80211_registered_device *rdev;
1201 int res;
1202
1203 if (!netif_running(dev))
1204 return -ENETDOWN;
1205
1206 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1207
1208 if (IS_ERR(rdev))
1209 return PTR_ERR(rdev);
1210
1211 if (rdev->scan_req) {
1212 res = -EAGAIN;
1213 goto out;
1214 }
1215
1216 res = ieee80211_scan_results(rdev, info, extra, data->length);
1217 data->length = 0;
1218 if (res >= 0) {
1219 data->length = res;
1220 res = 0;
1221 }
1222
1223 out:
1224 cfg80211_unlock_rdev(rdev);
1225 return res;
1226 }
1227 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);
1228 #endif
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