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Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/linville/wirel...
[deliverable/linux.git] / net / wireless / scan.c
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 (30 * 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
263 /* equal if both missing */
264 if (!ie1 && !ie2)
265 return 0;
266 /* sort missing IE before (left of) present IE */
267 if (!ie1)
268 return -1;
269 if (!ie2)
270 return 1;
271
272 /* sort by length first, then by contents */
273 if (ie1[1] != ie2[1])
274 return ie2[1] - ie1[1];
275 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
276 }
277
278 static bool is_bss(struct cfg80211_bss *a,
279 const u8 *bssid,
280 const u8 *ssid, size_t ssid_len)
281 {
282 const u8 *ssidie;
283
284 if (bssid && compare_ether_addr(a->bssid, bssid))
285 return false;
286
287 if (!ssid)
288 return true;
289
290 ssidie = cfg80211_find_ie(WLAN_EID_SSID,
291 a->information_elements,
292 a->len_information_elements);
293 if (!ssidie)
294 return false;
295 if (ssidie[1] != ssid_len)
296 return false;
297 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
298 }
299
300 static bool is_mesh_bss(struct cfg80211_bss *a)
301 {
302 const u8 *ie;
303
304 if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
305 return false;
306
307 ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
308 a->information_elements,
309 a->len_information_elements);
310 if (!ie)
311 return false;
312
313 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
314 a->information_elements,
315 a->len_information_elements);
316 if (!ie)
317 return false;
318
319 return true;
320 }
321
322 static bool is_mesh(struct cfg80211_bss *a,
323 const u8 *meshid, size_t meshidlen,
324 const u8 *meshcfg)
325 {
326 const u8 *ie;
327
328 if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
329 return false;
330
331 ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
332 a->information_elements,
333 a->len_information_elements);
334 if (!ie)
335 return false;
336 if (ie[1] != meshidlen)
337 return false;
338 if (memcmp(ie + 2, meshid, meshidlen))
339 return false;
340
341 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
342 a->information_elements,
343 a->len_information_elements);
344 if (!ie)
345 return false;
346 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
347 return false;
348
349 /*
350 * Ignore mesh capability (last two bytes of the IE) when
351 * comparing since that may differ between stations taking
352 * part in the same mesh.
353 */
354 return memcmp(ie + 2, meshcfg,
355 sizeof(struct ieee80211_meshconf_ie) - 2) == 0;
356 }
357
358 static int cmp_bss_core(struct cfg80211_bss *a,
359 struct cfg80211_bss *b)
360 {
361 int r;
362
363 if (a->channel != b->channel)
364 return b->channel->center_freq - a->channel->center_freq;
365
366 if (is_mesh_bss(a) && is_mesh_bss(b)) {
367 r = cmp_ies(WLAN_EID_MESH_ID,
368 a->information_elements,
369 a->len_information_elements,
370 b->information_elements,
371 b->len_information_elements);
372 if (r)
373 return r;
374 return cmp_ies(WLAN_EID_MESH_CONFIG,
375 a->information_elements,
376 a->len_information_elements,
377 b->information_elements,
378 b->len_information_elements);
379 }
380
381 return compare_ether_addr(a->bssid, b->bssid);
382 }
383
384 static int cmp_bss(struct cfg80211_bss *a,
385 struct cfg80211_bss *b)
386 {
387 int r;
388
389 r = cmp_bss_core(a, b);
390 if (r)
391 return r;
392
393 return cmp_ies(WLAN_EID_SSID,
394 a->information_elements,
395 a->len_information_elements,
396 b->information_elements,
397 b->len_information_elements);
398 }
399
400 static int cmp_hidden_bss(struct cfg80211_bss *a,
401 struct cfg80211_bss *b)
402 {
403 const u8 *ie1;
404 const u8 *ie2;
405 int i;
406 int r;
407
408 r = cmp_bss_core(a, b);
409 if (r)
410 return r;
411
412 ie1 = cfg80211_find_ie(WLAN_EID_SSID,
413 a->information_elements,
414 a->len_information_elements);
415 ie2 = cfg80211_find_ie(WLAN_EID_SSID,
416 b->information_elements,
417 b->len_information_elements);
418
419 /* Key comparator must use same algorithm in any rb-tree
420 * search function (order is important), otherwise ordering
421 * of items in the tree is broken and search gives incorrect
422 * results. This code uses same order as cmp_ies() does. */
423
424 /* sort missing IE before (left of) present IE */
425 if (!ie1)
426 return -1;
427 if (!ie2)
428 return 1;
429
430 /* zero-size SSID is used as an indication of the hidden bss */
431 if (!ie2[1])
432 return 0;
433
434 /* sort by length first, then by contents */
435 if (ie1[1] != ie2[1])
436 return ie2[1] - ie1[1];
437
438 /* zeroed SSID ie is another indication of a hidden bss */
439 for (i = 0; i < ie2[1]; i++)
440 if (ie2[i + 2])
441 return -1;
442
443 return 0;
444 }
445
446 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
447 struct ieee80211_channel *channel,
448 const u8 *bssid,
449 const u8 *ssid, size_t ssid_len,
450 u16 capa_mask, u16 capa_val)
451 {
452 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
453 struct cfg80211_internal_bss *bss, *res = NULL;
454 unsigned long now = jiffies;
455
456 spin_lock_bh(&dev->bss_lock);
457
458 list_for_each_entry(bss, &dev->bss_list, list) {
459 if ((bss->pub.capability & capa_mask) != capa_val)
460 continue;
461 if (channel && bss->pub.channel != channel)
462 continue;
463 /* Don't get expired BSS structs */
464 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
465 !atomic_read(&bss->hold))
466 continue;
467 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
468 res = bss;
469 kref_get(&res->ref);
470 break;
471 }
472 }
473
474 spin_unlock_bh(&dev->bss_lock);
475 if (!res)
476 return NULL;
477 return &res->pub;
478 }
479 EXPORT_SYMBOL(cfg80211_get_bss);
480
481 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
482 struct ieee80211_channel *channel,
483 const u8 *meshid, size_t meshidlen,
484 const u8 *meshcfg)
485 {
486 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
487 struct cfg80211_internal_bss *bss, *res = NULL;
488
489 spin_lock_bh(&dev->bss_lock);
490
491 list_for_each_entry(bss, &dev->bss_list, list) {
492 if (channel && bss->pub.channel != channel)
493 continue;
494 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
495 res = bss;
496 kref_get(&res->ref);
497 break;
498 }
499 }
500
501 spin_unlock_bh(&dev->bss_lock);
502 if (!res)
503 return NULL;
504 return &res->pub;
505 }
506 EXPORT_SYMBOL(cfg80211_get_mesh);
507
508
509 static void rb_insert_bss(struct cfg80211_registered_device *dev,
510 struct cfg80211_internal_bss *bss)
511 {
512 struct rb_node **p = &dev->bss_tree.rb_node;
513 struct rb_node *parent = NULL;
514 struct cfg80211_internal_bss *tbss;
515 int cmp;
516
517 while (*p) {
518 parent = *p;
519 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
520
521 cmp = cmp_bss(&bss->pub, &tbss->pub);
522
523 if (WARN_ON(!cmp)) {
524 /* will sort of leak this BSS */
525 return;
526 }
527
528 if (cmp < 0)
529 p = &(*p)->rb_left;
530 else
531 p = &(*p)->rb_right;
532 }
533
534 rb_link_node(&bss->rbn, parent, p);
535 rb_insert_color(&bss->rbn, &dev->bss_tree);
536 }
537
538 static struct cfg80211_internal_bss *
539 rb_find_bss(struct cfg80211_registered_device *dev,
540 struct cfg80211_internal_bss *res)
541 {
542 struct rb_node *n = dev->bss_tree.rb_node;
543 struct cfg80211_internal_bss *bss;
544 int r;
545
546 while (n) {
547 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
548 r = cmp_bss(&res->pub, &bss->pub);
549
550 if (r == 0)
551 return bss;
552 else if (r < 0)
553 n = n->rb_left;
554 else
555 n = n->rb_right;
556 }
557
558 return NULL;
559 }
560
561 static struct cfg80211_internal_bss *
562 rb_find_hidden_bss(struct cfg80211_registered_device *dev,
563 struct cfg80211_internal_bss *res)
564 {
565 struct rb_node *n = dev->bss_tree.rb_node;
566 struct cfg80211_internal_bss *bss;
567 int r;
568
569 while (n) {
570 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
571 r = cmp_hidden_bss(&res->pub, &bss->pub);
572
573 if (r == 0)
574 return bss;
575 else if (r < 0)
576 n = n->rb_left;
577 else
578 n = n->rb_right;
579 }
580
581 return NULL;
582 }
583
584 static void
585 copy_hidden_ies(struct cfg80211_internal_bss *res,
586 struct cfg80211_internal_bss *hidden)
587 {
588 if (unlikely(res->pub.beacon_ies))
589 return;
590 if (WARN_ON(!hidden->pub.beacon_ies))
591 return;
592
593 res->pub.beacon_ies = kmalloc(hidden->pub.len_beacon_ies, GFP_ATOMIC);
594 if (unlikely(!res->pub.beacon_ies))
595 return;
596
597 res->beacon_ies_allocated = true;
598 res->pub.len_beacon_ies = hidden->pub.len_beacon_ies;
599 memcpy(res->pub.beacon_ies, hidden->pub.beacon_ies,
600 res->pub.len_beacon_ies);
601 }
602
603 static struct cfg80211_internal_bss *
604 cfg80211_bss_update(struct cfg80211_registered_device *dev,
605 struct cfg80211_internal_bss *res)
606 {
607 struct cfg80211_internal_bss *found = NULL;
608
609 /*
610 * The reference to "res" is donated to this function.
611 */
612
613 if (WARN_ON(!res->pub.channel)) {
614 kref_put(&res->ref, bss_release);
615 return NULL;
616 }
617
618 res->ts = jiffies;
619
620 spin_lock_bh(&dev->bss_lock);
621
622 found = rb_find_bss(dev, res);
623
624 if (found) {
625 found->pub.beacon_interval = res->pub.beacon_interval;
626 found->pub.tsf = res->pub.tsf;
627 found->pub.signal = res->pub.signal;
628 found->pub.capability = res->pub.capability;
629 found->ts = res->ts;
630
631 /* Update IEs */
632 if (res->pub.proberesp_ies) {
633 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
634 size_t ielen = res->pub.len_proberesp_ies;
635
636 if (found->pub.proberesp_ies &&
637 !found->proberesp_ies_allocated &&
638 ksize(found) >= used + ielen) {
639 memcpy(found->pub.proberesp_ies,
640 res->pub.proberesp_ies, ielen);
641 found->pub.len_proberesp_ies = ielen;
642 } else {
643 u8 *ies = found->pub.proberesp_ies;
644
645 if (found->proberesp_ies_allocated)
646 ies = krealloc(ies, ielen, GFP_ATOMIC);
647 else
648 ies = kmalloc(ielen, GFP_ATOMIC);
649
650 if (ies) {
651 memcpy(ies, res->pub.proberesp_ies,
652 ielen);
653 found->proberesp_ies_allocated = true;
654 found->pub.proberesp_ies = ies;
655 found->pub.len_proberesp_ies = ielen;
656 }
657 }
658
659 /* Override possible earlier Beacon frame IEs */
660 found->pub.information_elements =
661 found->pub.proberesp_ies;
662 found->pub.len_information_elements =
663 found->pub.len_proberesp_ies;
664 }
665 if (res->pub.beacon_ies) {
666 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
667 size_t ielen = res->pub.len_beacon_ies;
668 bool information_elements_is_beacon_ies =
669 (found->pub.information_elements ==
670 found->pub.beacon_ies);
671
672 if (found->pub.beacon_ies &&
673 !found->beacon_ies_allocated &&
674 ksize(found) >= used + ielen) {
675 memcpy(found->pub.beacon_ies,
676 res->pub.beacon_ies, ielen);
677 found->pub.len_beacon_ies = ielen;
678 } else {
679 u8 *ies = found->pub.beacon_ies;
680
681 if (found->beacon_ies_allocated)
682 ies = krealloc(ies, ielen, GFP_ATOMIC);
683 else
684 ies = kmalloc(ielen, GFP_ATOMIC);
685
686 if (ies) {
687 memcpy(ies, res->pub.beacon_ies,
688 ielen);
689 found->beacon_ies_allocated = true;
690 found->pub.beacon_ies = ies;
691 found->pub.len_beacon_ies = ielen;
692 }
693 }
694
695 /* Override IEs if they were from a beacon before */
696 if (information_elements_is_beacon_ies) {
697 found->pub.information_elements =
698 found->pub.beacon_ies;
699 found->pub.len_information_elements =
700 found->pub.len_beacon_ies;
701 }
702 }
703
704 kref_put(&res->ref, bss_release);
705 } else {
706 struct cfg80211_internal_bss *hidden;
707
708 /* First check if the beacon is a probe response from
709 * a hidden bss. If so, copy beacon ies (with nullified
710 * ssid) into the probe response bss entry (with real ssid).
711 * It is required basically for PSM implementation
712 * (probe responses do not contain tim ie) */
713
714 /* TODO: The code is not trying to update existing probe
715 * response bss entries when beacon ies are
716 * getting changed. */
717 hidden = rb_find_hidden_bss(dev, res);
718 if (hidden)
719 copy_hidden_ies(res, hidden);
720
721 /* this "consumes" the reference */
722 list_add_tail(&res->list, &dev->bss_list);
723 rb_insert_bss(dev, res);
724 found = res;
725 }
726
727 dev->bss_generation++;
728 spin_unlock_bh(&dev->bss_lock);
729
730 kref_get(&found->ref);
731 return found;
732 }
733
734 struct cfg80211_bss*
735 cfg80211_inform_bss(struct wiphy *wiphy,
736 struct ieee80211_channel *channel,
737 const u8 *bssid, u64 tsf, u16 capability,
738 u16 beacon_interval, const u8 *ie, size_t ielen,
739 s32 signal, gfp_t gfp)
740 {
741 struct cfg80211_internal_bss *res;
742 size_t privsz;
743
744 if (WARN_ON(!wiphy))
745 return NULL;
746
747 privsz = wiphy->bss_priv_size;
748
749 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
750 (signal < 0 || signal > 100)))
751 return NULL;
752
753 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
754 if (!res)
755 return NULL;
756
757 memcpy(res->pub.bssid, bssid, ETH_ALEN);
758 res->pub.channel = channel;
759 res->pub.signal = signal;
760 res->pub.tsf = tsf;
761 res->pub.beacon_interval = beacon_interval;
762 res->pub.capability = capability;
763 /*
764 * Since we do not know here whether the IEs are from a Beacon or Probe
765 * Response frame, we need to pick one of the options and only use it
766 * with the driver that does not provide the full Beacon/Probe Response
767 * frame. Use Beacon frame pointer to avoid indicating that this should
768 * override the information_elements pointer should we have received an
769 * earlier indication of Probe Response data.
770 *
771 * The initial buffer for the IEs is allocated with the BSS entry and
772 * is located after the private area.
773 */
774 res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz;
775 memcpy(res->pub.beacon_ies, ie, ielen);
776 res->pub.len_beacon_ies = ielen;
777 res->pub.information_elements = res->pub.beacon_ies;
778 res->pub.len_information_elements = res->pub.len_beacon_ies;
779
780 kref_init(&res->ref);
781
782 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
783 if (!res)
784 return NULL;
785
786 if (res->pub.capability & WLAN_CAPABILITY_ESS)
787 regulatory_hint_found_beacon(wiphy, channel, gfp);
788
789 /* cfg80211_bss_update gives us a referenced result */
790 return &res->pub;
791 }
792 EXPORT_SYMBOL(cfg80211_inform_bss);
793
794 struct cfg80211_bss *
795 cfg80211_inform_bss_frame(struct wiphy *wiphy,
796 struct ieee80211_channel *channel,
797 struct ieee80211_mgmt *mgmt, size_t len,
798 s32 signal, gfp_t gfp)
799 {
800 struct cfg80211_internal_bss *res;
801 size_t ielen = len - offsetof(struct ieee80211_mgmt,
802 u.probe_resp.variable);
803 size_t privsz;
804
805 if (WARN_ON(!mgmt))
806 return NULL;
807
808 if (WARN_ON(!wiphy))
809 return NULL;
810
811 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
812 (signal < 0 || signal > 100)))
813 return NULL;
814
815 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
816 return NULL;
817
818 privsz = wiphy->bss_priv_size;
819
820 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
821 if (!res)
822 return NULL;
823
824 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
825 res->pub.channel = channel;
826 res->pub.signal = signal;
827 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
828 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
829 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
830 /*
831 * The initial buffer for the IEs is allocated with the BSS entry and
832 * is located after the private area.
833 */
834 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
835 res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz;
836 memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable,
837 ielen);
838 res->pub.len_proberesp_ies = ielen;
839 res->pub.information_elements = res->pub.proberesp_ies;
840 res->pub.len_information_elements = res->pub.len_proberesp_ies;
841 } else {
842 res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz;
843 memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen);
844 res->pub.len_beacon_ies = ielen;
845 res->pub.information_elements = res->pub.beacon_ies;
846 res->pub.len_information_elements = res->pub.len_beacon_ies;
847 }
848
849 kref_init(&res->ref);
850
851 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
852 if (!res)
853 return NULL;
854
855 if (res->pub.capability & WLAN_CAPABILITY_ESS)
856 regulatory_hint_found_beacon(wiphy, channel, gfp);
857
858 /* cfg80211_bss_update gives us a referenced result */
859 return &res->pub;
860 }
861 EXPORT_SYMBOL(cfg80211_inform_bss_frame);
862
863 void cfg80211_ref_bss(struct cfg80211_bss *pub)
864 {
865 struct cfg80211_internal_bss *bss;
866
867 if (!pub)
868 return;
869
870 bss = container_of(pub, struct cfg80211_internal_bss, pub);
871 kref_get(&bss->ref);
872 }
873 EXPORT_SYMBOL(cfg80211_ref_bss);
874
875 void cfg80211_put_bss(struct cfg80211_bss *pub)
876 {
877 struct cfg80211_internal_bss *bss;
878
879 if (!pub)
880 return;
881
882 bss = container_of(pub, struct cfg80211_internal_bss, pub);
883 kref_put(&bss->ref, bss_release);
884 }
885 EXPORT_SYMBOL(cfg80211_put_bss);
886
887 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
888 {
889 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
890 struct cfg80211_internal_bss *bss;
891
892 if (WARN_ON(!pub))
893 return;
894
895 bss = container_of(pub, struct cfg80211_internal_bss, pub);
896
897 spin_lock_bh(&dev->bss_lock);
898 if (!list_empty(&bss->list)) {
899 __cfg80211_unlink_bss(dev, bss);
900 dev->bss_generation++;
901 }
902 spin_unlock_bh(&dev->bss_lock);
903 }
904 EXPORT_SYMBOL(cfg80211_unlink_bss);
905
906 #ifdef CONFIG_CFG80211_WEXT
907 int cfg80211_wext_siwscan(struct net_device *dev,
908 struct iw_request_info *info,
909 union iwreq_data *wrqu, char *extra)
910 {
911 struct cfg80211_registered_device *rdev;
912 struct wiphy *wiphy;
913 struct iw_scan_req *wreq = NULL;
914 struct cfg80211_scan_request *creq = NULL;
915 int i, err, n_channels = 0;
916 enum ieee80211_band band;
917
918 if (!netif_running(dev))
919 return -ENETDOWN;
920
921 if (wrqu->data.length == sizeof(struct iw_scan_req))
922 wreq = (struct iw_scan_req *)extra;
923
924 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
925
926 if (IS_ERR(rdev))
927 return PTR_ERR(rdev);
928
929 if (rdev->scan_req) {
930 err = -EBUSY;
931 goto out;
932 }
933
934 wiphy = &rdev->wiphy;
935
936 /* Determine number of channels, needed to allocate creq */
937 if (wreq && wreq->num_channels)
938 n_channels = wreq->num_channels;
939 else {
940 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
941 if (wiphy->bands[band])
942 n_channels += wiphy->bands[band]->n_channels;
943 }
944
945 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
946 n_channels * sizeof(void *),
947 GFP_ATOMIC);
948 if (!creq) {
949 err = -ENOMEM;
950 goto out;
951 }
952
953 creq->wiphy = wiphy;
954 creq->dev = dev;
955 /* SSIDs come after channels */
956 creq->ssids = (void *)&creq->channels[n_channels];
957 creq->n_channels = n_channels;
958 creq->n_ssids = 1;
959
960 /* translate "Scan on frequencies" request */
961 i = 0;
962 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
963 int j;
964
965 if (!wiphy->bands[band])
966 continue;
967
968 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
969 /* ignore disabled channels */
970 if (wiphy->bands[band]->channels[j].flags &
971 IEEE80211_CHAN_DISABLED)
972 continue;
973
974 /* If we have a wireless request structure and the
975 * wireless request specifies frequencies, then search
976 * for the matching hardware channel.
977 */
978 if (wreq && wreq->num_channels) {
979 int k;
980 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
981 for (k = 0; k < wreq->num_channels; k++) {
982 int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]);
983 if (wext_freq == wiphy_freq)
984 goto wext_freq_found;
985 }
986 goto wext_freq_not_found;
987 }
988
989 wext_freq_found:
990 creq->channels[i] = &wiphy->bands[band]->channels[j];
991 i++;
992 wext_freq_not_found: ;
993 }
994 }
995 /* No channels found? */
996 if (!i) {
997 err = -EINVAL;
998 goto out;
999 }
1000
1001 /* Set real number of channels specified in creq->channels[] */
1002 creq->n_channels = i;
1003
1004 /* translate "Scan for SSID" request */
1005 if (wreq) {
1006 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
1007 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
1008 err = -EINVAL;
1009 goto out;
1010 }
1011 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
1012 creq->ssids[0].ssid_len = wreq->essid_len;
1013 }
1014 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
1015 creq->n_ssids = 0;
1016 }
1017
1018 for (i = 0; i < IEEE80211_NUM_BANDS; i++)
1019 if (wiphy->bands[i])
1020 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
1021
1022 rdev->scan_req = creq;
1023 err = rdev->ops->scan(wiphy, dev, creq);
1024 if (err) {
1025 rdev->scan_req = NULL;
1026 /* creq will be freed below */
1027 } else {
1028 nl80211_send_scan_start(rdev, dev);
1029 /* creq now owned by driver */
1030 creq = NULL;
1031 dev_hold(dev);
1032 }
1033 out:
1034 kfree(creq);
1035 cfg80211_unlock_rdev(rdev);
1036 return err;
1037 }
1038 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
1039
1040 static void ieee80211_scan_add_ies(struct iw_request_info *info,
1041 struct cfg80211_bss *bss,
1042 char **current_ev, char *end_buf)
1043 {
1044 u8 *pos, *end, *next;
1045 struct iw_event iwe;
1046
1047 if (!bss->information_elements ||
1048 !bss->len_information_elements)
1049 return;
1050
1051 /*
1052 * If needed, fragment the IEs buffer (at IE boundaries) into short
1053 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
1054 */
1055 pos = bss->information_elements;
1056 end = pos + bss->len_information_elements;
1057
1058 while (end - pos > IW_GENERIC_IE_MAX) {
1059 next = pos + 2 + pos[1];
1060 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
1061 next = next + 2 + next[1];
1062
1063 memset(&iwe, 0, sizeof(iwe));
1064 iwe.cmd = IWEVGENIE;
1065 iwe.u.data.length = next - pos;
1066 *current_ev = iwe_stream_add_point(info, *current_ev,
1067 end_buf, &iwe, pos);
1068
1069 pos = next;
1070 }
1071
1072 if (end > pos) {
1073 memset(&iwe, 0, sizeof(iwe));
1074 iwe.cmd = IWEVGENIE;
1075 iwe.u.data.length = end - pos;
1076 *current_ev = iwe_stream_add_point(info, *current_ev,
1077 end_buf, &iwe, pos);
1078 }
1079 }
1080
1081 static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
1082 {
1083 unsigned long end = jiffies;
1084
1085 if (end >= start)
1086 return jiffies_to_msecs(end - start);
1087
1088 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
1089 }
1090
1091 static char *
1092 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
1093 struct cfg80211_internal_bss *bss, char *current_ev,
1094 char *end_buf)
1095 {
1096 struct iw_event iwe;
1097 u8 *buf, *cfg, *p;
1098 u8 *ie = bss->pub.information_elements;
1099 int rem = bss->pub.len_information_elements, i, sig;
1100 bool ismesh = false;
1101
1102 memset(&iwe, 0, sizeof(iwe));
1103 iwe.cmd = SIOCGIWAP;
1104 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1105 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
1106 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1107 IW_EV_ADDR_LEN);
1108
1109 memset(&iwe, 0, sizeof(iwe));
1110 iwe.cmd = SIOCGIWFREQ;
1111 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
1112 iwe.u.freq.e = 0;
1113 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1114 IW_EV_FREQ_LEN);
1115
1116 memset(&iwe, 0, sizeof(iwe));
1117 iwe.cmd = SIOCGIWFREQ;
1118 iwe.u.freq.m = bss->pub.channel->center_freq;
1119 iwe.u.freq.e = 6;
1120 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1121 IW_EV_FREQ_LEN);
1122
1123 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
1124 memset(&iwe, 0, sizeof(iwe));
1125 iwe.cmd = IWEVQUAL;
1126 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
1127 IW_QUAL_NOISE_INVALID |
1128 IW_QUAL_QUAL_UPDATED;
1129 switch (wiphy->signal_type) {
1130 case CFG80211_SIGNAL_TYPE_MBM:
1131 sig = bss->pub.signal / 100;
1132 iwe.u.qual.level = sig;
1133 iwe.u.qual.updated |= IW_QUAL_DBM;
1134 if (sig < -110) /* rather bad */
1135 sig = -110;
1136 else if (sig > -40) /* perfect */
1137 sig = -40;
1138 /* will give a range of 0 .. 70 */
1139 iwe.u.qual.qual = sig + 110;
1140 break;
1141 case CFG80211_SIGNAL_TYPE_UNSPEC:
1142 iwe.u.qual.level = bss->pub.signal;
1143 /* will give range 0 .. 100 */
1144 iwe.u.qual.qual = bss->pub.signal;
1145 break;
1146 default:
1147 /* not reached */
1148 break;
1149 }
1150 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1151 &iwe, IW_EV_QUAL_LEN);
1152 }
1153
1154 memset(&iwe, 0, sizeof(iwe));
1155 iwe.cmd = SIOCGIWENCODE;
1156 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
1157 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1158 else
1159 iwe.u.data.flags = IW_ENCODE_DISABLED;
1160 iwe.u.data.length = 0;
1161 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1162 &iwe, "");
1163
1164 while (rem >= 2) {
1165 /* invalid data */
1166 if (ie[1] > rem - 2)
1167 break;
1168
1169 switch (ie[0]) {
1170 case WLAN_EID_SSID:
1171 memset(&iwe, 0, sizeof(iwe));
1172 iwe.cmd = SIOCGIWESSID;
1173 iwe.u.data.length = ie[1];
1174 iwe.u.data.flags = 1;
1175 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1176 &iwe, ie + 2);
1177 break;
1178 case WLAN_EID_MESH_ID:
1179 memset(&iwe, 0, sizeof(iwe));
1180 iwe.cmd = SIOCGIWESSID;
1181 iwe.u.data.length = ie[1];
1182 iwe.u.data.flags = 1;
1183 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1184 &iwe, ie + 2);
1185 break;
1186 case WLAN_EID_MESH_CONFIG:
1187 ismesh = true;
1188 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
1189 break;
1190 buf = kmalloc(50, GFP_ATOMIC);
1191 if (!buf)
1192 break;
1193 cfg = ie + 2;
1194 memset(&iwe, 0, sizeof(iwe));
1195 iwe.cmd = IWEVCUSTOM;
1196 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
1197 "0x%02X", cfg[0]);
1198 iwe.u.data.length = strlen(buf);
1199 current_ev = iwe_stream_add_point(info, current_ev,
1200 end_buf,
1201 &iwe, buf);
1202 sprintf(buf, "Path Selection Metric ID: 0x%02X",
1203 cfg[1]);
1204 iwe.u.data.length = strlen(buf);
1205 current_ev = iwe_stream_add_point(info, current_ev,
1206 end_buf,
1207 &iwe, buf);
1208 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
1209 cfg[2]);
1210 iwe.u.data.length = strlen(buf);
1211 current_ev = iwe_stream_add_point(info, current_ev,
1212 end_buf,
1213 &iwe, buf);
1214 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
1215 iwe.u.data.length = strlen(buf);
1216 current_ev = iwe_stream_add_point(info, current_ev,
1217 end_buf,
1218 &iwe, buf);
1219 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
1220 iwe.u.data.length = strlen(buf);
1221 current_ev = iwe_stream_add_point(info, current_ev,
1222 end_buf,
1223 &iwe, buf);
1224 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
1225 iwe.u.data.length = strlen(buf);
1226 current_ev = iwe_stream_add_point(info, current_ev,
1227 end_buf,
1228 &iwe, buf);
1229 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
1230 iwe.u.data.length = strlen(buf);
1231 current_ev = iwe_stream_add_point(info, current_ev,
1232 end_buf,
1233 &iwe, buf);
1234 kfree(buf);
1235 break;
1236 case WLAN_EID_SUPP_RATES:
1237 case WLAN_EID_EXT_SUPP_RATES:
1238 /* display all supported rates in readable format */
1239 p = current_ev + iwe_stream_lcp_len(info);
1240
1241 memset(&iwe, 0, sizeof(iwe));
1242 iwe.cmd = SIOCGIWRATE;
1243 /* Those two flags are ignored... */
1244 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
1245
1246 for (i = 0; i < ie[1]; i++) {
1247 iwe.u.bitrate.value =
1248 ((ie[i + 2] & 0x7f) * 500000);
1249 p = iwe_stream_add_value(info, current_ev, p,
1250 end_buf, &iwe, IW_EV_PARAM_LEN);
1251 }
1252 current_ev = p;
1253 break;
1254 }
1255 rem -= ie[1] + 2;
1256 ie += ie[1] + 2;
1257 }
1258
1259 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
1260 ismesh) {
1261 memset(&iwe, 0, sizeof(iwe));
1262 iwe.cmd = SIOCGIWMODE;
1263 if (ismesh)
1264 iwe.u.mode = IW_MODE_MESH;
1265 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
1266 iwe.u.mode = IW_MODE_MASTER;
1267 else
1268 iwe.u.mode = IW_MODE_ADHOC;
1269 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1270 &iwe, IW_EV_UINT_LEN);
1271 }
1272
1273 buf = kmalloc(30, GFP_ATOMIC);
1274 if (buf) {
1275 memset(&iwe, 0, sizeof(iwe));
1276 iwe.cmd = IWEVCUSTOM;
1277 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
1278 iwe.u.data.length = strlen(buf);
1279 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1280 &iwe, buf);
1281 memset(&iwe, 0, sizeof(iwe));
1282 iwe.cmd = IWEVCUSTOM;
1283 sprintf(buf, " Last beacon: %ums ago",
1284 elapsed_jiffies_msecs(bss->ts));
1285 iwe.u.data.length = strlen(buf);
1286 current_ev = iwe_stream_add_point(info, current_ev,
1287 end_buf, &iwe, buf);
1288 kfree(buf);
1289 }
1290
1291 ieee80211_scan_add_ies(info, &bss->pub, &current_ev, end_buf);
1292
1293 return current_ev;
1294 }
1295
1296
1297 static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
1298 struct iw_request_info *info,
1299 char *buf, size_t len)
1300 {
1301 char *current_ev = buf;
1302 char *end_buf = buf + len;
1303 struct cfg80211_internal_bss *bss;
1304
1305 spin_lock_bh(&dev->bss_lock);
1306 cfg80211_bss_expire(dev);
1307
1308 list_for_each_entry(bss, &dev->bss_list, list) {
1309 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
1310 spin_unlock_bh(&dev->bss_lock);
1311 return -E2BIG;
1312 }
1313 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
1314 current_ev, end_buf);
1315 }
1316 spin_unlock_bh(&dev->bss_lock);
1317 return current_ev - buf;
1318 }
1319
1320
1321 int cfg80211_wext_giwscan(struct net_device *dev,
1322 struct iw_request_info *info,
1323 struct iw_point *data, char *extra)
1324 {
1325 struct cfg80211_registered_device *rdev;
1326 int res;
1327
1328 if (!netif_running(dev))
1329 return -ENETDOWN;
1330
1331 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1332
1333 if (IS_ERR(rdev))
1334 return PTR_ERR(rdev);
1335
1336 if (rdev->scan_req) {
1337 res = -EAGAIN;
1338 goto out;
1339 }
1340
1341 res = ieee80211_scan_results(rdev, info, extra, data->length);
1342 data->length = 0;
1343 if (res >= 0) {
1344 data->length = res;
1345 res = 0;
1346 }
1347
1348 out:
1349 cfg80211_unlock_rdev(rdev);
1350 return res;
1351 }
1352 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);
1353 #endif
Linux kernel - Deliverables
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