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cfg80211: fix scan crash on single-band cards
[linux/fpc-iii.git] / net / wireless / scan.c
blob2936cb809152cd77451147c22045924396026bbc
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 mutex_lock(&rdev->sched_scan_mtx);
104
105 /* we don't have sched_scan_req anymore if the scan is stopping */
106 if (rdev->sched_scan_req)
107 nl80211_send_sched_scan_results(rdev,
108 rdev->sched_scan_req->dev);
109
110 mutex_unlock(&rdev->sched_scan_mtx);
111 }
112
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 mutex_lock(&rdev->sched_scan_mtx);
127 __cfg80211_stop_sched_scan(rdev, true);
128 mutex_unlock(&rdev->sched_scan_mtx);
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 struct net_device *dev;
136
137 lockdep_assert_held(&rdev->sched_scan_mtx);
138
139 if (!rdev->sched_scan_req)
140 return -ENOENT;
141
142 dev = rdev->sched_scan_req->dev;
143
144 if (!driver_initiated) {
145 int err = rdev->ops->sched_scan_stop(&rdev->wiphy, dev);
146 if (err)
147 return err;
148 }
149
150 nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED);
151
152 kfree(rdev->sched_scan_req);
153 rdev->sched_scan_req = NULL;
154
155 return 0;
156 }
157
158 static void bss_release(struct kref *ref)
159 {
160 struct cfg80211_internal_bss *bss;
161
162 bss = container_of(ref, struct cfg80211_internal_bss, ref);
163 if (bss->pub.free_priv)
164 bss->pub.free_priv(&bss->pub);
165
166 if (bss->beacon_ies_allocated)
167 kfree(bss->pub.beacon_ies);
168 if (bss->proberesp_ies_allocated)
169 kfree(bss->pub.proberesp_ies);
170
171 BUG_ON(atomic_read(&bss->hold));
172
173 kfree(bss);
174 }
175
176 /* must hold dev->bss_lock! */
177 void cfg80211_bss_age(struct cfg80211_registered_device *dev,
178 unsigned long age_secs)
179 {
180 struct cfg80211_internal_bss *bss;
181 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
182
183 list_for_each_entry(bss, &dev->bss_list, list) {
184 bss->ts -= age_jiffies;
185 }
186 }
187
188 /* must hold dev->bss_lock! */
189 static void __cfg80211_unlink_bss(struct cfg80211_registered_device *dev,
190 struct cfg80211_internal_bss *bss)
191 {
192 list_del_init(&bss->list);
193 rb_erase(&bss->rbn, &dev->bss_tree);
194 kref_put(&bss->ref, bss_release);
195 }
196
197 /* must hold dev->bss_lock! */
198 void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
199 {
200 struct cfg80211_internal_bss *bss, *tmp;
201 bool expired = false;
202
203 list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
204 if (atomic_read(&bss->hold))
205 continue;
206 if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE))
207 continue;
208 __cfg80211_unlink_bss(dev, bss);
209 expired = true;
210 }
211
212 if (expired)
213 dev->bss_generation++;
214 }
215
216 const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len)
217 {
218 while (len > 2 && ies[0] != eid) {
219 len -= ies[1] + 2;
220 ies += ies[1] + 2;
221 }
222 if (len < 2)
223 return NULL;
224 if (len < 2 + ies[1])
225 return NULL;
226 return ies;
227 }
228 EXPORT_SYMBOL(cfg80211_find_ie);
229
230 static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
231 {
232 const u8 *ie1 = cfg80211_find_ie(num, ies1, len1);
233 const u8 *ie2 = cfg80211_find_ie(num, ies2, len2);
234 int r;
235
236 if (!ie1 && !ie2)
237 return 0;
238 if (!ie1 || !ie2)
239 return -1;
240
241 r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1]));
242 if (r == 0 && ie1[1] != ie2[1])
243 return ie2[1] - ie1[1];
244 return r;
245 }
246
247 static bool is_bss(struct cfg80211_bss *a,
248 const u8 *bssid,
249 const u8 *ssid, size_t ssid_len)
250 {
251 const u8 *ssidie;
252
253 if (bssid && compare_ether_addr(a->bssid, bssid))
254 return false;
255
256 if (!ssid)
257 return true;
258
259 ssidie = cfg80211_find_ie(WLAN_EID_SSID,
260 a->information_elements,
261 a->len_information_elements);
262 if (!ssidie)
263 return false;
264 if (ssidie[1] != ssid_len)
265 return false;
266 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
267 }
268
269 static bool is_mesh_bss(struct cfg80211_bss *a)
270 {
271 const u8 *ie;
272
273 if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
274 return false;
275
276 ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
277 a->information_elements,
278 a->len_information_elements);
279 if (!ie)
280 return false;
281
282 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
283 a->information_elements,
284 a->len_information_elements);
285 if (!ie)
286 return false;
287
288 return true;
289 }
290
291 static bool is_mesh(struct cfg80211_bss *a,
292 const u8 *meshid, size_t meshidlen,
293 const u8 *meshcfg)
294 {
295 const u8 *ie;
296
297 if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
298 return false;
299
300 ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
301 a->information_elements,
302 a->len_information_elements);
303 if (!ie)
304 return false;
305 if (ie[1] != meshidlen)
306 return false;
307 if (memcmp(ie + 2, meshid, meshidlen))
308 return false;
309
310 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
311 a->information_elements,
312 a->len_information_elements);
313 if (!ie)
314 return false;
315 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
316 return false;
317
318 /*
319 * Ignore mesh capability (last two bytes of the IE) when
320 * comparing since that may differ between stations taking
321 * part in the same mesh.
322 */
323 return memcmp(ie + 2, meshcfg,
324 sizeof(struct ieee80211_meshconf_ie) - 2) == 0;
325 }
326
327 static int cmp_bss(struct cfg80211_bss *a,
328 struct cfg80211_bss *b)
329 {
330 int r;
331
332 if (a->channel != b->channel)
333 return b->channel->center_freq - a->channel->center_freq;
334
335 if (is_mesh_bss(a) && is_mesh_bss(b)) {
336 r = cmp_ies(WLAN_EID_MESH_ID,
337 a->information_elements,
338 a->len_information_elements,
339 b->information_elements,
340 b->len_information_elements);
341 if (r)
342 return r;
343 return cmp_ies(WLAN_EID_MESH_CONFIG,
344 a->information_elements,
345 a->len_information_elements,
346 b->information_elements,
347 b->len_information_elements);
348 }
349
350 r = memcmp(a->bssid, b->bssid, ETH_ALEN);
351 if (r)
352 return r;
353
354 return cmp_ies(WLAN_EID_SSID,
355 a->information_elements,
356 a->len_information_elements,
357 b->information_elements,
358 b->len_information_elements);
359 }
360
361 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
362 struct ieee80211_channel *channel,
363 const u8 *bssid,
364 const u8 *ssid, size_t ssid_len,
365 u16 capa_mask, u16 capa_val)
366 {
367 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
368 struct cfg80211_internal_bss *bss, *res = NULL;
369 unsigned long now = jiffies;
370
371 spin_lock_bh(&dev->bss_lock);
372
373 list_for_each_entry(bss, &dev->bss_list, list) {
374 if ((bss->pub.capability & capa_mask) != capa_val)
375 continue;
376 if (channel && bss->pub.channel != channel)
377 continue;
378 /* Don't get expired BSS structs */
379 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
380 !atomic_read(&bss->hold))
381 continue;
382 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
383 res = bss;
384 kref_get(&res->ref);
385 break;
386 }
387 }
388
389 spin_unlock_bh(&dev->bss_lock);
390 if (!res)
391 return NULL;
392 return &res->pub;
393 }
394 EXPORT_SYMBOL(cfg80211_get_bss);
395
396 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
397 struct ieee80211_channel *channel,
398 const u8 *meshid, size_t meshidlen,
399 const u8 *meshcfg)
400 {
401 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
402 struct cfg80211_internal_bss *bss, *res = NULL;
403
404 spin_lock_bh(&dev->bss_lock);
405
406 list_for_each_entry(bss, &dev->bss_list, list) {
407 if (channel && bss->pub.channel != channel)
408 continue;
409 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
410 res = bss;
411 kref_get(&res->ref);
412 break;
413 }
414 }
415
416 spin_unlock_bh(&dev->bss_lock);
417 if (!res)
418 return NULL;
419 return &res->pub;
420 }
421 EXPORT_SYMBOL(cfg80211_get_mesh);
422
423
424 static void rb_insert_bss(struct cfg80211_registered_device *dev,
425 struct cfg80211_internal_bss *bss)
426 {
427 struct rb_node **p = &dev->bss_tree.rb_node;
428 struct rb_node *parent = NULL;
429 struct cfg80211_internal_bss *tbss;
430 int cmp;
431
432 while (*p) {
433 parent = *p;
434 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
435
436 cmp = cmp_bss(&bss->pub, &tbss->pub);
437
438 if (WARN_ON(!cmp)) {
439 /* will sort of leak this BSS */
440 return;
441 }
442
443 if (cmp < 0)
444 p = &(*p)->rb_left;
445 else
446 p = &(*p)->rb_right;
447 }
448
449 rb_link_node(&bss->rbn, parent, p);
450 rb_insert_color(&bss->rbn, &dev->bss_tree);
451 }
452
453 static struct cfg80211_internal_bss *
454 rb_find_bss(struct cfg80211_registered_device *dev,
455 struct cfg80211_internal_bss *res)
456 {
457 struct rb_node *n = dev->bss_tree.rb_node;
458 struct cfg80211_internal_bss *bss;
459 int r;
460
461 while (n) {
462 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
463 r = cmp_bss(&res->pub, &bss->pub);
464
465 if (r == 0)
466 return bss;
467 else if (r < 0)
468 n = n->rb_left;
469 else
470 n = n->rb_right;
471 }
472
473 return NULL;
474 }
475
476 static struct cfg80211_internal_bss *
477 cfg80211_bss_update(struct cfg80211_registered_device *dev,
478 struct cfg80211_internal_bss *res)
479 {
480 struct cfg80211_internal_bss *found = NULL;
481
482 /*
483 * The reference to "res" is donated to this function.
484 */
485
486 if (WARN_ON(!res->pub.channel)) {
487 kref_put(&res->ref, bss_release);
488 return NULL;
489 }
490
491 res->ts = jiffies;
492
493 spin_lock_bh(&dev->bss_lock);
494
495 found = rb_find_bss(dev, res);
496
497 if (found) {
498 found->pub.beacon_interval = res->pub.beacon_interval;
499 found->pub.tsf = res->pub.tsf;
500 found->pub.signal = res->pub.signal;
501 found->pub.capability = res->pub.capability;
502 found->ts = res->ts;
503
504 /* Update IEs */
505 if (res->pub.proberesp_ies) {
506 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
507 size_t ielen = res->pub.len_proberesp_ies;
508
509 if (found->pub.proberesp_ies &&
510 !found->proberesp_ies_allocated &&
511 ksize(found) >= used + ielen) {
512 memcpy(found->pub.proberesp_ies,
513 res->pub.proberesp_ies, ielen);
514 found->pub.len_proberesp_ies = ielen;
515 } else {
516 u8 *ies = found->pub.proberesp_ies;
517
518 if (found->proberesp_ies_allocated)
519 ies = krealloc(ies, ielen, GFP_ATOMIC);
520 else
521 ies = kmalloc(ielen, GFP_ATOMIC);
522
523 if (ies) {
524 memcpy(ies, res->pub.proberesp_ies,
525 ielen);
526 found->proberesp_ies_allocated = true;
527 found->pub.proberesp_ies = ies;
528 found->pub.len_proberesp_ies = ielen;
529 }
530 }
531
532 /* Override possible earlier Beacon frame IEs */
533 found->pub.information_elements =
534 found->pub.proberesp_ies;
535 found->pub.len_information_elements =
536 found->pub.len_proberesp_ies;
537 }
538 if (res->pub.beacon_ies) {
539 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
540 size_t ielen = res->pub.len_beacon_ies;
541 bool information_elements_is_beacon_ies =
542 (found->pub.information_elements ==
543 found->pub.beacon_ies);
544
545 if (found->pub.beacon_ies &&
546 !found->beacon_ies_allocated &&
547 ksize(found) >= used + ielen) {
548 memcpy(found->pub.beacon_ies,
549 res->pub.beacon_ies, ielen);
550 found->pub.len_beacon_ies = ielen;
551 } else {
552 u8 *ies = found->pub.beacon_ies;
553
554 if (found->beacon_ies_allocated)
555 ies = krealloc(ies, ielen, GFP_ATOMIC);
556 else
557 ies = kmalloc(ielen, GFP_ATOMIC);
558
559 if (ies) {
560 memcpy(ies, res->pub.beacon_ies,
561 ielen);
562 found->beacon_ies_allocated = true;
563 found->pub.beacon_ies = ies;
564 found->pub.len_beacon_ies = ielen;
565 }
566 }
567
568 /* Override IEs if they were from a beacon before */
569 if (information_elements_is_beacon_ies) {
570 found->pub.information_elements =
571 found->pub.beacon_ies;
572 found->pub.len_information_elements =
573 found->pub.len_beacon_ies;
574 }
575 }
576
577 kref_put(&res->ref, bss_release);
578 } else {
579 /* this "consumes" the reference */
580 list_add_tail(&res->list, &dev->bss_list);
581 rb_insert_bss(dev, res);
582 found = res;
583 }
584
585 dev->bss_generation++;
586 spin_unlock_bh(&dev->bss_lock);
587
588 kref_get(&found->ref);
589 return found;
590 }
591
592 struct cfg80211_bss*
593 cfg80211_inform_bss(struct wiphy *wiphy,
594 struct ieee80211_channel *channel,
595 const u8 *bssid,
596 u64 timestamp, u16 capability, u16 beacon_interval,
597 const u8 *ie, size_t ielen,
598 s32 signal, gfp_t gfp)
599 {
600 struct cfg80211_internal_bss *res;
601 size_t privsz;
602
603 if (WARN_ON(!wiphy))
604 return NULL;
605
606 privsz = wiphy->bss_priv_size;
607
608 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
609 (signal < 0 || signal > 100)))
610 return NULL;
611
612 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
613 if (!res)
614 return NULL;
615
616 memcpy(res->pub.bssid, bssid, ETH_ALEN);
617 res->pub.channel = channel;
618 res->pub.signal = signal;
619 res->pub.tsf = timestamp;
620 res->pub.beacon_interval = beacon_interval;
621 res->pub.capability = capability;
622 /*
623 * Since we do not know here whether the IEs are from a Beacon or Probe
624 * Response frame, we need to pick one of the options and only use it
625 * with the driver that does not provide the full Beacon/Probe Response
626 * frame. Use Beacon frame pointer to avoid indicating that this should
627 * override the information_elements pointer should we have received an
628 * earlier indication of Probe Response data.
629 *
630 * The initial buffer for the IEs is allocated with the BSS entry and
631 * is located after the private area.
632 */
633 res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz;
634 memcpy(res->pub.beacon_ies, ie, ielen);
635 res->pub.len_beacon_ies = ielen;
636 res->pub.information_elements = res->pub.beacon_ies;
637 res->pub.len_information_elements = res->pub.len_beacon_ies;
638
639 kref_init(&res->ref);
640
641 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
642 if (!res)
643 return NULL;
644
645 if (res->pub.capability & WLAN_CAPABILITY_ESS)
646 regulatory_hint_found_beacon(wiphy, channel, gfp);
647
648 /* cfg80211_bss_update gives us a referenced result */
649 return &res->pub;
650 }
651 EXPORT_SYMBOL(cfg80211_inform_bss);
652
653 struct cfg80211_bss *
654 cfg80211_inform_bss_frame(struct wiphy *wiphy,
655 struct ieee80211_channel *channel,
656 struct ieee80211_mgmt *mgmt, size_t len,
657 s32 signal, gfp_t gfp)
658 {
659 struct cfg80211_internal_bss *res;
660 size_t ielen = len - offsetof(struct ieee80211_mgmt,
661 u.probe_resp.variable);
662 size_t privsz;
663
664 if (WARN_ON(!mgmt))
665 return NULL;
666
667 if (WARN_ON(!wiphy))
668 return NULL;
669
670 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
671 (signal < 0 || signal > 100)))
672 return NULL;
673
674 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
675 return NULL;
676
677 privsz = wiphy->bss_priv_size;
678
679 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
680 if (!res)
681 return NULL;
682
683 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
684 res->pub.channel = channel;
685 res->pub.signal = signal;
686 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
687 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
688 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
689 /*
690 * The initial buffer for the IEs is allocated with the BSS entry and
691 * is located after the private area.
692 */
693 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
694 res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz;
695 memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable,
696 ielen);
697 res->pub.len_proberesp_ies = ielen;
698 res->pub.information_elements = res->pub.proberesp_ies;
699 res->pub.len_information_elements = res->pub.len_proberesp_ies;
700 } else {
701 res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz;
702 memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen);
703 res->pub.len_beacon_ies = ielen;
704 res->pub.information_elements = res->pub.beacon_ies;
705 res->pub.len_information_elements = res->pub.len_beacon_ies;
706 }
707
708 kref_init(&res->ref);
709
710 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
711 if (!res)
712 return NULL;
713
714 if (res->pub.capability & WLAN_CAPABILITY_ESS)
715 regulatory_hint_found_beacon(wiphy, channel, gfp);
716
717 /* cfg80211_bss_update gives us a referenced result */
718 return &res->pub;
719 }
720 EXPORT_SYMBOL(cfg80211_inform_bss_frame);
721
722 void cfg80211_put_bss(struct cfg80211_bss *pub)
723 {
724 struct cfg80211_internal_bss *bss;
725
726 if (!pub)
727 return;
728
729 bss = container_of(pub, struct cfg80211_internal_bss, pub);
730 kref_put(&bss->ref, bss_release);
731 }
732 EXPORT_SYMBOL(cfg80211_put_bss);
733
734 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
735 {
736 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
737 struct cfg80211_internal_bss *bss;
738
739 if (WARN_ON(!pub))
740 return;
741
742 bss = container_of(pub, struct cfg80211_internal_bss, pub);
743
744 spin_lock_bh(&dev->bss_lock);
745 if (!list_empty(&bss->list)) {
746 __cfg80211_unlink_bss(dev, bss);
747 dev->bss_generation++;
748 }
749 spin_unlock_bh(&dev->bss_lock);
750 }
751 EXPORT_SYMBOL(cfg80211_unlink_bss);
752
753 #ifdef CONFIG_CFG80211_WEXT
754 int cfg80211_wext_siwscan(struct net_device *dev,
755 struct iw_request_info *info,
756 union iwreq_data *wrqu, char *extra)
757 {
758 struct cfg80211_registered_device *rdev;
759 struct wiphy *wiphy;
760 struct iw_scan_req *wreq = NULL;
761 struct cfg80211_scan_request *creq = NULL;
762 int i, err, n_channels = 0;
763 enum ieee80211_band band;
764
765 if (!netif_running(dev))
766 return -ENETDOWN;
767
768 if (wrqu->data.length == sizeof(struct iw_scan_req))
769 wreq = (struct iw_scan_req *)extra;
770
771 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
772
773 if (IS_ERR(rdev))
774 return PTR_ERR(rdev);
775
776 if (rdev->scan_req) {
777 err = -EBUSY;
778 goto out;
779 }
780
781 wiphy = &rdev->wiphy;
782
783 /* Determine number of channels, needed to allocate creq */
784 if (wreq && wreq->num_channels)
785 n_channels = wreq->num_channels;
786 else {
787 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
788 if (wiphy->bands[band])
789 n_channels += wiphy->bands[band]->n_channels;
790 }
791
792 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
793 n_channels * sizeof(void *),
794 GFP_ATOMIC);
795 if (!creq) {
796 err = -ENOMEM;
797 goto out;
798 }
799
800 creq->wiphy = wiphy;
801 creq->dev = dev;
802 /* SSIDs come after channels */
803 creq->ssids = (void *)&creq->channels[n_channels];
804 creq->n_channels = n_channels;
805 creq->n_ssids = 1;
806
807 /* translate "Scan on frequencies" request */
808 i = 0;
809 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
810 int j;
811
812 if (!wiphy->bands[band])
813 continue;
814
815 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
816 /* ignore disabled channels */
817 if (wiphy->bands[band]->channels[j].flags &
818 IEEE80211_CHAN_DISABLED)
819 continue;
820
821 /* If we have a wireless request structure and the
822 * wireless request specifies frequencies, then search
823 * for the matching hardware channel.
824 */
825 if (wreq && wreq->num_channels) {
826 int k;
827 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
828 for (k = 0; k < wreq->num_channels; k++) {
829 int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]);
830 if (wext_freq == wiphy_freq)
831 goto wext_freq_found;
832 }
833 goto wext_freq_not_found;
834 }
835
836 wext_freq_found:
837 creq->channels[i] = &wiphy->bands[band]->channels[j];
838 i++;
839 wext_freq_not_found: ;
840 }
841 }
842 /* No channels found? */
843 if (!i) {
844 err = -EINVAL;
845 goto out;
846 }
847
848 /* Set real number of channels specified in creq->channels[] */
849 creq->n_channels = i;
850
851 /* translate "Scan for SSID" request */
852 if (wreq) {
853 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
854 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
855 err = -EINVAL;
856 goto out;
857 }
858 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
859 creq->ssids[0].ssid_len = wreq->essid_len;
860 }
861 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
862 creq->n_ssids = 0;
863 }
864
865 for (i = 0; i < IEEE80211_NUM_BANDS; i++)
866 if (wiphy->bands[i])
867 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
868
869 rdev->scan_req = creq;
870 err = rdev->ops->scan(wiphy, dev, creq);
871 if (err) {
872 rdev->scan_req = NULL;
873 /* creq will be freed below */
874 } else {
875 nl80211_send_scan_start(rdev, dev);
876 /* creq now owned by driver */
877 creq = NULL;
878 dev_hold(dev);
879 }
880 out:
881 kfree(creq);
882 cfg80211_unlock_rdev(rdev);
883 return err;
884 }
885 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
886
887 static void ieee80211_scan_add_ies(struct iw_request_info *info,
888 struct cfg80211_bss *bss,
889 char **current_ev, char *end_buf)
890 {
891 u8 *pos, *end, *next;
892 struct iw_event iwe;
893
894 if (!bss->information_elements ||
895 !bss->len_information_elements)
896 return;
897
898 /*
899 * If needed, fragment the IEs buffer (at IE boundaries) into short
900 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
901 */
902 pos = bss->information_elements;
903 end = pos + bss->len_information_elements;
904
905 while (end - pos > IW_GENERIC_IE_MAX) {
906 next = pos + 2 + pos[1];
907 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
908 next = next + 2 + next[1];
909
910 memset(&iwe, 0, sizeof(iwe));
911 iwe.cmd = IWEVGENIE;
912 iwe.u.data.length = next - pos;
913 *current_ev = iwe_stream_add_point(info, *current_ev,
914 end_buf, &iwe, pos);
915
916 pos = next;
917 }
918
919 if (end > pos) {
920 memset(&iwe, 0, sizeof(iwe));
921 iwe.cmd = IWEVGENIE;
922 iwe.u.data.length = end - pos;
923 *current_ev = iwe_stream_add_point(info, *current_ev,
924 end_buf, &iwe, pos);
925 }
926 }
927
928 static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
929 {
930 unsigned long end = jiffies;
931
932 if (end >= start)
933 return jiffies_to_msecs(end - start);
934
935 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
936 }
937
938 static char *
939 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
940 struct cfg80211_internal_bss *bss, char *current_ev,
941 char *end_buf)
942 {
943 struct iw_event iwe;
944 u8 *buf, *cfg, *p;
945 u8 *ie = bss->pub.information_elements;
946 int rem = bss->pub.len_information_elements, i, sig;
947 bool ismesh = false;
948
949 memset(&iwe, 0, sizeof(iwe));
950 iwe.cmd = SIOCGIWAP;
951 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
952 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
953 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
954 IW_EV_ADDR_LEN);
955
956 memset(&iwe, 0, sizeof(iwe));
957 iwe.cmd = SIOCGIWFREQ;
958 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
959 iwe.u.freq.e = 0;
960 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
961 IW_EV_FREQ_LEN);
962
963 memset(&iwe, 0, sizeof(iwe));
964 iwe.cmd = SIOCGIWFREQ;
965 iwe.u.freq.m = bss->pub.channel->center_freq;
966 iwe.u.freq.e = 6;
967 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
968 IW_EV_FREQ_LEN);
969
970 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
971 memset(&iwe, 0, sizeof(iwe));
972 iwe.cmd = IWEVQUAL;
973 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
974 IW_QUAL_NOISE_INVALID |
975 IW_QUAL_QUAL_UPDATED;
976 switch (wiphy->signal_type) {
977 case CFG80211_SIGNAL_TYPE_MBM:
978 sig = bss->pub.signal / 100;
979 iwe.u.qual.level = sig;
980 iwe.u.qual.updated |= IW_QUAL_DBM;
981 if (sig < -110) /* rather bad */
982 sig = -110;
983 else if (sig > -40) /* perfect */
984 sig = -40;
985 /* will give a range of 0 .. 70 */
986 iwe.u.qual.qual = sig + 110;
987 break;
988 case CFG80211_SIGNAL_TYPE_UNSPEC:
989 iwe.u.qual.level = bss->pub.signal;
990 /* will give range 0 .. 100 */
991 iwe.u.qual.qual = bss->pub.signal;
992 break;
993 default:
994 /* not reached */
995 break;
996 }
997 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
998 &iwe, IW_EV_QUAL_LEN);
999 }
1000
1001 memset(&iwe, 0, sizeof(iwe));
1002 iwe.cmd = SIOCGIWENCODE;
1003 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
1004 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1005 else
1006 iwe.u.data.flags = IW_ENCODE_DISABLED;
1007 iwe.u.data.length = 0;
1008 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1009 &iwe, "");
1010
1011 while (rem >= 2) {
1012 /* invalid data */
1013 if (ie[1] > rem - 2)
1014 break;
1015
1016 switch (ie[0]) {
1017 case WLAN_EID_SSID:
1018 memset(&iwe, 0, sizeof(iwe));
1019 iwe.cmd = SIOCGIWESSID;
1020 iwe.u.data.length = ie[1];
1021 iwe.u.data.flags = 1;
1022 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1023 &iwe, ie + 2);
1024 break;
1025 case WLAN_EID_MESH_ID:
1026 memset(&iwe, 0, sizeof(iwe));
1027 iwe.cmd = SIOCGIWESSID;
1028 iwe.u.data.length = ie[1];
1029 iwe.u.data.flags = 1;
1030 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1031 &iwe, ie + 2);
1032 break;
1033 case WLAN_EID_MESH_CONFIG:
1034 ismesh = true;
1035 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
1036 break;
1037 buf = kmalloc(50, GFP_ATOMIC);
1038 if (!buf)
1039 break;
1040 cfg = ie + 2;
1041 memset(&iwe, 0, sizeof(iwe));
1042 iwe.cmd = IWEVCUSTOM;
1043 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
1044 "0x%02X", cfg[0]);
1045 iwe.u.data.length = strlen(buf);
1046 current_ev = iwe_stream_add_point(info, current_ev,
1047 end_buf,
1048 &iwe, buf);
1049 sprintf(buf, "Path Selection Metric ID: 0x%02X",
1050 cfg[1]);
1051 iwe.u.data.length = strlen(buf);
1052 current_ev = iwe_stream_add_point(info, current_ev,
1053 end_buf,
1054 &iwe, buf);
1055 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
1056 cfg[2]);
1057 iwe.u.data.length = strlen(buf);
1058 current_ev = iwe_stream_add_point(info, current_ev,
1059 end_buf,
1060 &iwe, buf);
1061 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
1062 iwe.u.data.length = strlen(buf);
1063 current_ev = iwe_stream_add_point(info, current_ev,
1064 end_buf,
1065 &iwe, buf);
1066 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
1067 iwe.u.data.length = strlen(buf);
1068 current_ev = iwe_stream_add_point(info, current_ev,
1069 end_buf,
1070 &iwe, buf);
1071 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
1072 iwe.u.data.length = strlen(buf);
1073 current_ev = iwe_stream_add_point(info, current_ev,
1074 end_buf,
1075 &iwe, buf);
1076 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
1077 iwe.u.data.length = strlen(buf);
1078 current_ev = iwe_stream_add_point(info, current_ev,
1079 end_buf,
1080 &iwe, buf);
1081 kfree(buf);
1082 break;
1083 case WLAN_EID_SUPP_RATES:
1084 case WLAN_EID_EXT_SUPP_RATES:
1085 /* display all supported rates in readable format */
1086 p = current_ev + iwe_stream_lcp_len(info);
1087
1088 memset(&iwe, 0, sizeof(iwe));
1089 iwe.cmd = SIOCGIWRATE;
1090 /* Those two flags are ignored... */
1091 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
1092
1093 for (i = 0; i < ie[1]; i++) {
1094 iwe.u.bitrate.value =
1095 ((ie[i + 2] & 0x7f) * 500000);
1096 p = iwe_stream_add_value(info, current_ev, p,
1097 end_buf, &iwe, IW_EV_PARAM_LEN);
1098 }
1099 current_ev = p;
1100 break;
1101 }
1102 rem -= ie[1] + 2;
1103 ie += ie[1] + 2;
1104 }
1105
1106 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
1107 ismesh) {
1108 memset(&iwe, 0, sizeof(iwe));
1109 iwe.cmd = SIOCGIWMODE;
1110 if (ismesh)
1111 iwe.u.mode = IW_MODE_MESH;
1112 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
1113 iwe.u.mode = IW_MODE_MASTER;
1114 else
1115 iwe.u.mode = IW_MODE_ADHOC;
1116 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1117 &iwe, IW_EV_UINT_LEN);
1118 }
1119
1120 buf = kmalloc(30, GFP_ATOMIC);
1121 if (buf) {
1122 memset(&iwe, 0, sizeof(iwe));
1123 iwe.cmd = IWEVCUSTOM;
1124 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
1125 iwe.u.data.length = strlen(buf);
1126 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1127 &iwe, buf);
1128 memset(&iwe, 0, sizeof(iwe));
1129 iwe.cmd = IWEVCUSTOM;
1130 sprintf(buf, " Last beacon: %ums ago",
1131 elapsed_jiffies_msecs(bss->ts));
1132 iwe.u.data.length = strlen(buf);
1133 current_ev = iwe_stream_add_point(info, current_ev,
1134 end_buf, &iwe, buf);
1135 kfree(buf);
1136 }
1137
1138 ieee80211_scan_add_ies(info, &bss->pub, &current_ev, end_buf);
1139
1140 return current_ev;
1141 }
1142
1143
1144 static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
1145 struct iw_request_info *info,
1146 char *buf, size_t len)
1147 {
1148 char *current_ev = buf;
1149 char *end_buf = buf + len;
1150 struct cfg80211_internal_bss *bss;
1151
1152 spin_lock_bh(&dev->bss_lock);
1153 cfg80211_bss_expire(dev);
1154
1155 list_for_each_entry(bss, &dev->bss_list, list) {
1156 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
1157 spin_unlock_bh(&dev->bss_lock);
1158 return -E2BIG;
1159 }
1160 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
1161 current_ev, end_buf);
1162 }
1163 spin_unlock_bh(&dev->bss_lock);
1164 return current_ev - buf;
1165 }
1166
1167
1168 int cfg80211_wext_giwscan(struct net_device *dev,
1169 struct iw_request_info *info,
1170 struct iw_point *data, char *extra)
1171 {
1172 struct cfg80211_registered_device *rdev;
1173 int res;
1174
1175 if (!netif_running(dev))
1176 return -ENETDOWN;
1177
1178 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1179
1180 if (IS_ERR(rdev))
1181 return PTR_ERR(rdev);
1182
1183 if (rdev->scan_req) {
1184 res = -EAGAIN;
1185 goto out;
1186 }
1187
1188 res = ieee80211_scan_results(rdev, info, extra, data->length);
1189 data->length = 0;
1190 if (res >= 0) {
1191 data->length = res;
1192 res = 0;
1193 }
1194
1195 out:
1196 cfg80211_unlock_rdev(rdev);
1197 return res;
1198 }
1199 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);
1200 #endif
Linux with added FPC-III support