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alpha: fix several security issues
[linux/fpc-iii.git] / net / wireless / scan.c
blob7a6c67667d708e97400a6974175323f7cfd712e6
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
22 void ___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
75 void __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
87 void 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 }
94 EXPORT_SYMBOL(cfg80211_scan_done);
95
96 void __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 cfg80211_lock_rdev(rdev);
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 cfg80211_unlock_rdev(rdev);
111 }
112
113 void 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 }
120 EXPORT_SYMBOL(cfg80211_sched_scan_results);
121
122 void cfg80211_sched_scan_stopped(struct wiphy *wiphy)
123 {
124 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
125
126 cfg80211_lock_rdev(rdev);
127 __cfg80211_stop_sched_scan(rdev, true);
128 cfg80211_unlock_rdev(rdev);
129 }
130 EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
131
132 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
133 bool driver_initiated)
134 {
135 int err;
136 struct net_device *dev;
137
138 ASSERT_RDEV_LOCK(rdev);
139
140 if (!rdev->sched_scan_req)
141 return 0;
142
143 dev = rdev->sched_scan_req->dev;
144
145 if (!driver_initiated) {
146 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 err;
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 static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
232 {
233 const u8 *ie1 = cfg80211_find_ie(num, ies1, len1);
234 const u8 *ie2 = cfg80211_find_ie(num, ies2, len2);
235 int r;
236
237 if (!ie1 && !ie2)
238 return 0;
239 if (!ie1 || !ie2)
240 return -1;
241
242 r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1]));
243 if (r == 0 && ie1[1] != ie2[1])
244 return ie2[1] - ie1[1];
245 return r;
246 }
247
248 static bool is_bss(struct cfg80211_bss *a,
249 const u8 *bssid,
250 const u8 *ssid, size_t ssid_len)
251 {
252 const u8 *ssidie;
253
254 if (bssid && compare_ether_addr(a->bssid, bssid))
255 return false;
256
257 if (!ssid)
258 return true;
259
260 ssidie = cfg80211_find_ie(WLAN_EID_SSID,
261 a->information_elements,
262 a->len_information_elements);
263 if (!ssidie)
264 return false;
265 if (ssidie[1] != ssid_len)
266 return false;
267 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
268 }
269
270 static bool is_mesh_bss(struct cfg80211_bss *a)
271 {
272 const u8 *ie;
273
274 if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
275 return false;
276
277 ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
278 a->information_elements,
279 a->len_information_elements);
280 if (!ie)
281 return false;
282
283 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
284 a->information_elements,
285 a->len_information_elements);
286 if (!ie)
287 return false;
288
289 return true;
290 }
291
292 static bool is_mesh(struct cfg80211_bss *a,
293 const u8 *meshid, size_t meshidlen,
294 const u8 *meshcfg)
295 {
296 const u8 *ie;
297
298 if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
299 return false;
300
301 ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
302 a->information_elements,
303 a->len_information_elements);
304 if (!ie)
305 return false;
306 if (ie[1] != meshidlen)
307 return false;
308 if (memcmp(ie + 2, meshid, meshidlen))
309 return false;
310
311 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
312 a->information_elements,
313 a->len_information_elements);
314 if (!ie)
315 return false;
316 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
317 return false;
318
319 /*
320 * Ignore mesh capability (last two bytes of the IE) when
321 * comparing since that may differ between stations taking
322 * part in the same mesh.
323 */
324 return memcmp(ie + 2, meshcfg,
325 sizeof(struct ieee80211_meshconf_ie) - 2) == 0;
326 }
327
328 static int cmp_bss(struct cfg80211_bss *a,
329 struct cfg80211_bss *b)
330 {
331 int r;
332
333 if (a->channel != b->channel)
334 return b->channel->center_freq - a->channel->center_freq;
335
336 if (is_mesh_bss(a) && is_mesh_bss(b)) {
337 r = cmp_ies(WLAN_EID_MESH_ID,
338 a->information_elements,
339 a->len_information_elements,
340 b->information_elements,
341 b->len_information_elements);
342 if (r)
343 return r;
344 return cmp_ies(WLAN_EID_MESH_CONFIG,
345 a->information_elements,
346 a->len_information_elements,
347 b->information_elements,
348 b->len_information_elements);
349 }
350
351 r = memcmp(a->bssid, b->bssid, ETH_ALEN);
352 if (r)
353 return r;
354
355 return cmp_ies(WLAN_EID_SSID,
356 a->information_elements,
357 a->len_information_elements,
358 b->information_elements,
359 b->len_information_elements);
360 }
361
362 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
363 struct ieee80211_channel *channel,
364 const u8 *bssid,
365 const u8 *ssid, size_t ssid_len,
366 u16 capa_mask, u16 capa_val)
367 {
368 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
369 struct cfg80211_internal_bss *bss, *res = NULL;
370 unsigned long now = jiffies;
371
372 spin_lock_bh(&dev->bss_lock);
373
374 list_for_each_entry(bss, &dev->bss_list, list) {
375 if ((bss->pub.capability & capa_mask) != capa_val)
376 continue;
377 if (channel && bss->pub.channel != channel)
378 continue;
379 /* Don't get expired BSS structs */
380 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
381 !atomic_read(&bss->hold))
382 continue;
383 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
384 res = bss;
385 kref_get(&res->ref);
386 break;
387 }
388 }
389
390 spin_unlock_bh(&dev->bss_lock);
391 if (!res)
392 return NULL;
393 return &res->pub;
394 }
395 EXPORT_SYMBOL(cfg80211_get_bss);
396
397 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
398 struct ieee80211_channel *channel,
399 const u8 *meshid, size_t meshidlen,
400 const u8 *meshcfg)
401 {
402 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
403 struct cfg80211_internal_bss *bss, *res = NULL;
404
405 spin_lock_bh(&dev->bss_lock);
406
407 list_for_each_entry(bss, &dev->bss_list, list) {
408 if (channel && bss->pub.channel != channel)
409 continue;
410 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
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_mesh);
423
424
425 static void rb_insert_bss(struct cfg80211_registered_device *dev,
426 struct cfg80211_internal_bss *bss)
427 {
428 struct rb_node **p = &dev->bss_tree.rb_node;
429 struct rb_node *parent = NULL;
430 struct cfg80211_internal_bss *tbss;
431 int cmp;
432
433 while (*p) {
434 parent = *p;
435 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
436
437 cmp = cmp_bss(&bss->pub, &tbss->pub);
438
439 if (WARN_ON(!cmp)) {
440 /* will sort of leak this BSS */
441 return;
442 }
443
444 if (cmp < 0)
445 p = &(*p)->rb_left;
446 else
447 p = &(*p)->rb_right;
448 }
449
450 rb_link_node(&bss->rbn, parent, p);
451 rb_insert_color(&bss->rbn, &dev->bss_tree);
452 }
453
454 static struct cfg80211_internal_bss *
455 rb_find_bss(struct cfg80211_registered_device *dev,
456 struct cfg80211_internal_bss *res)
457 {
458 struct rb_node *n = dev->bss_tree.rb_node;
459 struct cfg80211_internal_bss *bss;
460 int r;
461
462 while (n) {
463 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
464 r = cmp_bss(&res->pub, &bss->pub);
465
466 if (r == 0)
467 return bss;
468 else if (r < 0)
469 n = n->rb_left;
470 else
471 n = n->rb_right;
472 }
473
474 return NULL;
475 }
476
477 static struct cfg80211_internal_bss *
478 cfg80211_bss_update(struct cfg80211_registered_device *dev,
479 struct cfg80211_internal_bss *res)
480 {
481 struct cfg80211_internal_bss *found = NULL;
482
483 /*
484 * The reference to "res" is donated to this function.
485 */
486
487 if (WARN_ON(!res->pub.channel)) {
488 kref_put(&res->ref, bss_release);
489 return NULL;
490 }
491
492 res->ts = jiffies;
493
494 spin_lock_bh(&dev->bss_lock);
495
496 found = rb_find_bss(dev, res);
497
498 if (found) {
499 found->pub.beacon_interval = res->pub.beacon_interval;
500 found->pub.tsf = res->pub.tsf;
501 found->pub.signal = res->pub.signal;
502 found->pub.capability = res->pub.capability;
503 found->ts = res->ts;
504
505 /* Update IEs */
506 if (res->pub.proberesp_ies) {
507 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
508 size_t ielen = res->pub.len_proberesp_ies;
509
510 if (found->pub.proberesp_ies &&
511 !found->proberesp_ies_allocated &&
512 ksize(found) >= used + ielen) {
513 memcpy(found->pub.proberesp_ies,
514 res->pub.proberesp_ies, ielen);
515 found->pub.len_proberesp_ies = ielen;
516 } else {
517 u8 *ies = found->pub.proberesp_ies;
518
519 if (found->proberesp_ies_allocated)
520 ies = krealloc(ies, ielen, GFP_ATOMIC);
521 else
522 ies = kmalloc(ielen, GFP_ATOMIC);
523
524 if (ies) {
525 memcpy(ies, res->pub.proberesp_ies,
526 ielen);
527 found->proberesp_ies_allocated = true;
528 found->pub.proberesp_ies = ies;
529 found->pub.len_proberesp_ies = ielen;
530 }
531 }
532
533 /* Override possible earlier Beacon frame IEs */
534 found->pub.information_elements =
535 found->pub.proberesp_ies;
536 found->pub.len_information_elements =
537 found->pub.len_proberesp_ies;
538 }
539 if (res->pub.beacon_ies) {
540 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
541 size_t ielen = res->pub.len_beacon_ies;
542 bool information_elements_is_beacon_ies =
543 (found->pub.information_elements ==
544 found->pub.beacon_ies);
545
546 if (found->pub.beacon_ies &&
547 !found->beacon_ies_allocated &&
548 ksize(found) >= used + ielen) {
549 memcpy(found->pub.beacon_ies,
550 res->pub.beacon_ies, ielen);
551 found->pub.len_beacon_ies = ielen;
552 } else {
553 u8 *ies = found->pub.beacon_ies;
554
555 if (found->beacon_ies_allocated)
556 ies = krealloc(ies, ielen, GFP_ATOMIC);
557 else
558 ies = kmalloc(ielen, GFP_ATOMIC);
559
560 if (ies) {
561 memcpy(ies, res->pub.beacon_ies,
562 ielen);
563 found->beacon_ies_allocated = true;
564 found->pub.beacon_ies = ies;
565 found->pub.len_beacon_ies = ielen;
566 }
567 }
568
569 /* Override IEs if they were from a beacon before */
570 if (information_elements_is_beacon_ies) {
571 found->pub.information_elements =
572 found->pub.beacon_ies;
573 found->pub.len_information_elements =
574 found->pub.len_beacon_ies;
575 }
576 }
577
578 kref_put(&res->ref, bss_release);
579 } else {
580 /* this "consumes" the reference */
581 list_add_tail(&res->list, &dev->bss_list);
582 rb_insert_bss(dev, res);
583 found = res;
584 }
585
586 dev->bss_generation++;
587 spin_unlock_bh(&dev->bss_lock);
588
589 kref_get(&found->ref);
590 return found;
591 }
592
593 struct cfg80211_bss*
594 cfg80211_inform_bss(struct wiphy *wiphy,
595 struct ieee80211_channel *channel,
596 const u8 *bssid,
597 u64 timestamp, u16 capability, u16 beacon_interval,
598 const u8 *ie, size_t ielen,
599 s32 signal, gfp_t gfp)
600 {
601 struct cfg80211_internal_bss *res;
602 size_t privsz;
603
604 if (WARN_ON(!wiphy))
605 return NULL;
606
607 privsz = wiphy->bss_priv_size;
608
609 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
610 (signal < 0 || signal > 100)))
611 return NULL;
612
613 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
614 if (!res)
615 return NULL;
616
617 memcpy(res->pub.bssid, bssid, ETH_ALEN);
618 res->pub.channel = channel;
619 res->pub.signal = signal;
620 res->pub.tsf = timestamp;
621 res->pub.beacon_interval = beacon_interval;
622 res->pub.capability = capability;
623 /*
624 * Since we do not know here whether the IEs are from a Beacon or Probe
625 * Response frame, we need to pick one of the options and only use it
626 * with the driver that does not provide the full Beacon/Probe Response
627 * frame. Use Beacon frame pointer to avoid indicating that this should
628 * override the information_elements pointer should we have received an
629 * earlier indication of Probe Response data.
630 *
631 * The initial buffer for the IEs is allocated with the BSS entry and
632 * is located after the private area.
633 */
634 res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz;
635 memcpy(res->pub.beacon_ies, ie, ielen);
636 res->pub.len_beacon_ies = ielen;
637 res->pub.information_elements = res->pub.beacon_ies;
638 res->pub.len_information_elements = res->pub.len_beacon_ies;
639
640 kref_init(&res->ref);
641
642 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
643 if (!res)
644 return NULL;
645
646 if (res->pub.capability & WLAN_CAPABILITY_ESS)
647 regulatory_hint_found_beacon(wiphy, channel, gfp);
648
649 /* cfg80211_bss_update gives us a referenced result */
650 return &res->pub;
651 }
652 EXPORT_SYMBOL(cfg80211_inform_bss);
653
654 struct cfg80211_bss *
655 cfg80211_inform_bss_frame(struct wiphy *wiphy,
656 struct ieee80211_channel *channel,
657 struct ieee80211_mgmt *mgmt, size_t len,
658 s32 signal, gfp_t gfp)
659 {
660 struct cfg80211_internal_bss *res;
661 size_t ielen = len - offsetof(struct ieee80211_mgmt,
662 u.probe_resp.variable);
663 size_t privsz;
664
665 if (WARN_ON(!mgmt))
666 return NULL;
667
668 if (WARN_ON(!wiphy))
669 return NULL;
670
671 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
672 (signal < 0 || signal > 100)))
673 return NULL;
674
675 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
676 return NULL;
677
678 privsz = wiphy->bss_priv_size;
679
680 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
681 if (!res)
682 return NULL;
683
684 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
685 res->pub.channel = channel;
686 res->pub.signal = signal;
687 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
688 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
689 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
690 /*
691 * The initial buffer for the IEs is allocated with the BSS entry and
692 * is located after the private area.
693 */
694 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
695 res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz;
696 memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable,
697 ielen);
698 res->pub.len_proberesp_ies = ielen;
699 res->pub.information_elements = res->pub.proberesp_ies;
700 res->pub.len_information_elements = res->pub.len_proberesp_ies;
701 } else {
702 res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz;
703 memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen);
704 res->pub.len_beacon_ies = ielen;
705 res->pub.information_elements = res->pub.beacon_ies;
706 res->pub.len_information_elements = res->pub.len_beacon_ies;
707 }
708
709 kref_init(&res->ref);
710
711 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
712 if (!res)
713 return NULL;
714
715 if (res->pub.capability & WLAN_CAPABILITY_ESS)
716 regulatory_hint_found_beacon(wiphy, channel, gfp);
717
718 /* cfg80211_bss_update gives us a referenced result */
719 return &res->pub;
720 }
721 EXPORT_SYMBOL(cfg80211_inform_bss_frame);
722
723 void cfg80211_put_bss(struct cfg80211_bss *pub)
724 {
725 struct cfg80211_internal_bss *bss;
726
727 if (!pub)
728 return;
729
730 bss = container_of(pub, struct cfg80211_internal_bss, pub);
731 kref_put(&bss->ref, bss_release);
732 }
733 EXPORT_SYMBOL(cfg80211_put_bss);
734
735 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
736 {
737 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
738 struct cfg80211_internal_bss *bss;
739
740 if (WARN_ON(!pub))
741 return;
742
743 bss = container_of(pub, struct cfg80211_internal_bss, pub);
744
745 spin_lock_bh(&dev->bss_lock);
746 if (!list_empty(&bss->list)) {
747 __cfg80211_unlink_bss(dev, bss);
748 dev->bss_generation++;
749 }
750 spin_unlock_bh(&dev->bss_lock);
751 }
752 EXPORT_SYMBOL(cfg80211_unlink_bss);
753
754 #ifdef CONFIG_CFG80211_WEXT
755 int cfg80211_wext_siwscan(struct net_device *dev,
756 struct iw_request_info *info,
757 union iwreq_data *wrqu, char *extra)
758 {
759 struct cfg80211_registered_device *rdev;
760 struct wiphy *wiphy;
761 struct iw_scan_req *wreq = NULL;
762 struct cfg80211_scan_request *creq = NULL;
763 int i, err, n_channels = 0;
764 enum ieee80211_band band;
765
766 if (!netif_running(dev))
767 return -ENETDOWN;
768
769 if (wrqu->data.length == sizeof(struct iw_scan_req))
770 wreq = (struct iw_scan_req *)extra;
771
772 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
773
774 if (IS_ERR(rdev))
775 return PTR_ERR(rdev);
776
777 if (rdev->scan_req) {
778 err = -EBUSY;
779 goto out;
780 }
781
782 wiphy = &rdev->wiphy;
783
784 /* Determine number of channels, needed to allocate creq */
785 if (wreq && wreq->num_channels)
786 n_channels = wreq->num_channels;
787 else {
788 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
789 if (wiphy->bands[band])
790 n_channels += wiphy->bands[band]->n_channels;
791 }
792
793 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
794 n_channels * sizeof(void *),
795 GFP_ATOMIC);
796 if (!creq) {
797 err = -ENOMEM;
798 goto out;
799 }
800
801 creq->wiphy = wiphy;
802 creq->dev = dev;
803 /* SSIDs come after channels */
804 creq->ssids = (void *)&creq->channels[n_channels];
805 creq->n_channels = n_channels;
806 creq->n_ssids = 1;
807
808 /* translate "Scan on frequencies" request */
809 i = 0;
810 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
811 int j;
812
813 if (!wiphy->bands[band])
814 continue;
815
816 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
817 /* ignore disabled channels */
818 if (wiphy->bands[band]->channels[j].flags &
819 IEEE80211_CHAN_DISABLED)
820 continue;
821
822 /* If we have a wireless request structure and the
823 * wireless request specifies frequencies, then search
824 * for the matching hardware channel.
825 */
826 if (wreq && wreq->num_channels) {
827 int k;
828 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
829 for (k = 0; k < wreq->num_channels; k++) {
830 int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]);
831 if (wext_freq == wiphy_freq)
832 goto wext_freq_found;
833 }
834 goto wext_freq_not_found;
835 }
836
837 wext_freq_found:
838 creq->channels[i] = &wiphy->bands[band]->channels[j];
839 i++;
840 wext_freq_not_found: ;
841 }
842 }
843 /* No channels found? */
844 if (!i) {
845 err = -EINVAL;
846 goto out;
847 }
848
849 /* Set real number of channels specified in creq->channels[] */
850 creq->n_channels = i;
851
852 /* translate "Scan for SSID" request */
853 if (wreq) {
854 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
855 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
856 err = -EINVAL;
857 goto out;
858 }
859 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
860 creq->ssids[0].ssid_len = wreq->essid_len;
861 }
862 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
863 creq->n_ssids = 0;
864 }
865
866 rdev->scan_req = creq;
867 err = rdev->ops->scan(wiphy, dev, creq);
868 if (err) {
869 rdev->scan_req = NULL;
870 /* creq will be freed below */
871 } else {
872 nl80211_send_scan_start(rdev, dev);
873 /* creq now owned by driver */
874 creq = NULL;
875 dev_hold(dev);
876 }
877 out:
878 kfree(creq);
879 cfg80211_unlock_rdev(rdev);
880 return err;
881 }
882 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
883
884 static void ieee80211_scan_add_ies(struct iw_request_info *info,
885 struct cfg80211_bss *bss,
886 char **current_ev, char *end_buf)
887 {
888 u8 *pos, *end, *next;
889 struct iw_event iwe;
890
891 if (!bss->information_elements ||
892 !bss->len_information_elements)
893 return;
894
895 /*
896 * If needed, fragment the IEs buffer (at IE boundaries) into short
897 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
898 */
899 pos = bss->information_elements;
900 end = pos + bss->len_information_elements;
901
902 while (end - pos > IW_GENERIC_IE_MAX) {
903 next = pos + 2 + pos[1];
904 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
905 next = next + 2 + next[1];
906
907 memset(&iwe, 0, sizeof(iwe));
908 iwe.cmd = IWEVGENIE;
909 iwe.u.data.length = next - pos;
910 *current_ev = iwe_stream_add_point(info, *current_ev,
911 end_buf, &iwe, pos);
912
913 pos = next;
914 }
915
916 if (end > pos) {
917 memset(&iwe, 0, sizeof(iwe));
918 iwe.cmd = IWEVGENIE;
919 iwe.u.data.length = end - pos;
920 *current_ev = iwe_stream_add_point(info, *current_ev,
921 end_buf, &iwe, pos);
922 }
923 }
924
925 static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
926 {
927 unsigned long end = jiffies;
928
929 if (end >= start)
930 return jiffies_to_msecs(end - start);
931
932 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
933 }
934
935 static char *
936 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
937 struct cfg80211_internal_bss *bss, char *current_ev,
938 char *end_buf)
939 {
940 struct iw_event iwe;
941 u8 *buf, *cfg, *p;
942 u8 *ie = bss->pub.information_elements;
943 int rem = bss->pub.len_information_elements, i, sig;
944 bool ismesh = false;
945
946 memset(&iwe, 0, sizeof(iwe));
947 iwe.cmd = SIOCGIWAP;
948 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
949 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
950 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
951 IW_EV_ADDR_LEN);
952
953 memset(&iwe, 0, sizeof(iwe));
954 iwe.cmd = SIOCGIWFREQ;
955 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
956 iwe.u.freq.e = 0;
957 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
958 IW_EV_FREQ_LEN);
959
960 memset(&iwe, 0, sizeof(iwe));
961 iwe.cmd = SIOCGIWFREQ;
962 iwe.u.freq.m = bss->pub.channel->center_freq;
963 iwe.u.freq.e = 6;
964 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
965 IW_EV_FREQ_LEN);
966
967 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
968 memset(&iwe, 0, sizeof(iwe));
969 iwe.cmd = IWEVQUAL;
970 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
971 IW_QUAL_NOISE_INVALID |
972 IW_QUAL_QUAL_UPDATED;
973 switch (wiphy->signal_type) {
974 case CFG80211_SIGNAL_TYPE_MBM:
975 sig = bss->pub.signal / 100;
976 iwe.u.qual.level = sig;
977 iwe.u.qual.updated |= IW_QUAL_DBM;
978 if (sig < -110) /* rather bad */
979 sig = -110;
980 else if (sig > -40) /* perfect */
981 sig = -40;
982 /* will give a range of 0 .. 70 */
983 iwe.u.qual.qual = sig + 110;
984 break;
985 case CFG80211_SIGNAL_TYPE_UNSPEC:
986 iwe.u.qual.level = bss->pub.signal;
987 /* will give range 0 .. 100 */
988 iwe.u.qual.qual = bss->pub.signal;
989 break;
990 default:
991 /* not reached */
992 break;
993 }
994 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
995 &iwe, IW_EV_QUAL_LEN);
996 }
997
998 memset(&iwe, 0, sizeof(iwe));
999 iwe.cmd = SIOCGIWENCODE;
1000 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
1001 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1002 else
1003 iwe.u.data.flags = IW_ENCODE_DISABLED;
1004 iwe.u.data.length = 0;
1005 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1006 &iwe, "");
1007
1008 while (rem >= 2) {
1009 /* invalid data */
1010 if (ie[1] > rem - 2)
1011 break;
1012
1013 switch (ie[0]) {
1014 case WLAN_EID_SSID:
1015 memset(&iwe, 0, sizeof(iwe));
1016 iwe.cmd = SIOCGIWESSID;
1017 iwe.u.data.length = ie[1];
1018 iwe.u.data.flags = 1;
1019 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1020 &iwe, ie + 2);
1021 break;
1022 case WLAN_EID_MESH_ID:
1023 memset(&iwe, 0, sizeof(iwe));
1024 iwe.cmd = SIOCGIWESSID;
1025 iwe.u.data.length = ie[1];
1026 iwe.u.data.flags = 1;
1027 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1028 &iwe, ie + 2);
1029 break;
1030 case WLAN_EID_MESH_CONFIG:
1031 ismesh = true;
1032 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
1033 break;
1034 buf = kmalloc(50, GFP_ATOMIC);
1035 if (!buf)
1036 break;
1037 cfg = ie + 2;
1038 memset(&iwe, 0, sizeof(iwe));
1039 iwe.cmd = IWEVCUSTOM;
1040 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
1041 "0x%02X", cfg[0]);
1042 iwe.u.data.length = strlen(buf);
1043 current_ev = iwe_stream_add_point(info, current_ev,
1044 end_buf,
1045 &iwe, buf);
1046 sprintf(buf, "Path Selection Metric ID: 0x%02X",
1047 cfg[1]);
1048 iwe.u.data.length = strlen(buf);
1049 current_ev = iwe_stream_add_point(info, current_ev,
1050 end_buf,
1051 &iwe, buf);
1052 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
1053 cfg[2]);
1054 iwe.u.data.length = strlen(buf);
1055 current_ev = iwe_stream_add_point(info, current_ev,
1056 end_buf,
1057 &iwe, buf);
1058 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
1059 iwe.u.data.length = strlen(buf);
1060 current_ev = iwe_stream_add_point(info, current_ev,
1061 end_buf,
1062 &iwe, buf);
1063 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
1064 iwe.u.data.length = strlen(buf);
1065 current_ev = iwe_stream_add_point(info, current_ev,
1066 end_buf,
1067 &iwe, buf);
1068 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
1069 iwe.u.data.length = strlen(buf);
1070 current_ev = iwe_stream_add_point(info, current_ev,
1071 end_buf,
1072 &iwe, buf);
1073 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
1074 iwe.u.data.length = strlen(buf);
1075 current_ev = iwe_stream_add_point(info, current_ev,
1076 end_buf,
1077 &iwe, buf);
1078 kfree(buf);
1079 break;
1080 case WLAN_EID_SUPP_RATES:
1081 case WLAN_EID_EXT_SUPP_RATES:
1082 /* display all supported rates in readable format */
1083 p = current_ev + iwe_stream_lcp_len(info);
1084
1085 memset(&iwe, 0, sizeof(iwe));
1086 iwe.cmd = SIOCGIWRATE;
1087 /* Those two flags are ignored... */
1088 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
1089
1090 for (i = 0; i < ie[1]; i++) {
1091 iwe.u.bitrate.value =
1092 ((ie[i + 2] & 0x7f) * 500000);
1093 p = iwe_stream_add_value(info, current_ev, p,
1094 end_buf, &iwe, IW_EV_PARAM_LEN);
1095 }
1096 current_ev = p;
1097 break;
1098 }
1099 rem -= ie[1] + 2;
1100 ie += ie[1] + 2;
1101 }
1102
1103 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
1104 ismesh) {
1105 memset(&iwe, 0, sizeof(iwe));
1106 iwe.cmd = SIOCGIWMODE;
1107 if (ismesh)
1108 iwe.u.mode = IW_MODE_MESH;
1109 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
1110 iwe.u.mode = IW_MODE_MASTER;
1111 else
1112 iwe.u.mode = IW_MODE_ADHOC;
1113 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1114 &iwe, IW_EV_UINT_LEN);
1115 }
1116
1117 buf = kmalloc(30, GFP_ATOMIC);
1118 if (buf) {
1119 memset(&iwe, 0, sizeof(iwe));
1120 iwe.cmd = IWEVCUSTOM;
1121 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
1122 iwe.u.data.length = strlen(buf);
1123 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1124 &iwe, buf);
1125 memset(&iwe, 0, sizeof(iwe));
1126 iwe.cmd = IWEVCUSTOM;
1127 sprintf(buf, " Last beacon: %ums ago",
1128 elapsed_jiffies_msecs(bss->ts));
1129 iwe.u.data.length = strlen(buf);
1130 current_ev = iwe_stream_add_point(info, current_ev,
1131 end_buf, &iwe, buf);
1132 kfree(buf);
1133 }
1134
1135 ieee80211_scan_add_ies(info, &bss->pub, &current_ev, end_buf);
1136
1137 return current_ev;
1138 }
1139
1140
1141 static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
1142 struct iw_request_info *info,
1143 char *buf, size_t len)
1144 {
1145 char *current_ev = buf;
1146 char *end_buf = buf + len;
1147 struct cfg80211_internal_bss *bss;
1148
1149 spin_lock_bh(&dev->bss_lock);
1150 cfg80211_bss_expire(dev);
1151
1152 list_for_each_entry(bss, &dev->bss_list, list) {
1153 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
1154 spin_unlock_bh(&dev->bss_lock);
1155 return -E2BIG;
1156 }
1157 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
1158 current_ev, end_buf);
1159 }
1160 spin_unlock_bh(&dev->bss_lock);
1161 return current_ev - buf;
1162 }
1163
1164
1165 int cfg80211_wext_giwscan(struct net_device *dev,
1166 struct iw_request_info *info,
1167 struct iw_point *data, char *extra)
1168 {
1169 struct cfg80211_registered_device *rdev;
1170 int res;
1171
1172 if (!netif_running(dev))
1173 return -ENETDOWN;
1174
1175 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1176
1177 if (IS_ERR(rdev))
1178 return PTR_ERR(rdev);
1179
1180 if (rdev->scan_req) {
1181 res = -EAGAIN;
1182 goto out;
1183 }
1184
1185 res = ieee80211_scan_results(rdev, info, extra, data->length);
1186 data->length = 0;
1187 if (res >= 0) {
1188 data->length = res;
1189 res = 0;
1190 }
1191
1192 out:
1193 cfg80211_unlock_rdev(rdev);
1194 return res;
1195 }
1196 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);
1197 #endif
Linux with added FPC-III support