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Staging: et131x: the stuck descriptor copy is never used
[linux-2.6/kvm.git] / net / wireless / scan.c
blob12dfa62aad18da8d74b6652dcef2c85c120fc896
1 /*
2 * cfg80211 scan result handling
3 *
4 * Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
5 */
6 #include <linux/kernel.h>
7 #include <linux/module.h>
8 #include <linux/netdevice.h>
9 #include <linux/wireless.h>
10 #include <linux/nl80211.h>
11 #include <linux/etherdevice.h>
12 #include <net/arp.h>
13 #include <net/cfg80211.h>
14 #include <net/iw_handler.h>
15 #include "core.h"
16 #include "nl80211.h"
17 #include "wext-compat.h"
18
19 #define IEEE80211_SCAN_RESULT_EXPIRE (15 * HZ)
20
21 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak)
22 {
23 struct cfg80211_scan_request *request;
24 struct net_device *dev;
25 #ifdef CONFIG_CFG80211_WEXT
26 union iwreq_data wrqu;
27 #endif
28
29 ASSERT_RDEV_LOCK(rdev);
30
31 request = rdev->scan_req;
32
33 if (!request)
34 return;
35
36 dev = request->dev;
37
38 /*
39 * This must be before sending the other events!
40 * Otherwise, wpa_supplicant gets completely confused with
41 * wext events.
42 */
43 cfg80211_sme_scan_done(dev);
44
45 if (request->aborted)
46 nl80211_send_scan_aborted(rdev, dev);
47 else
48 nl80211_send_scan_done(rdev, dev);
49
50 #ifdef CONFIG_CFG80211_WEXT
51 if (!request->aborted) {
52 memset(&wrqu, 0, sizeof(wrqu));
53
54 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
55 }
56 #endif
57
58 dev_put(dev);
59
60 rdev->scan_req = NULL;
61
62 /*
63 * OK. If this is invoked with "leak" then we can't
64 * free this ... but we've cleaned it up anyway. The
65 * driver failed to call the scan_done callback, so
66 * all bets are off, it might still be trying to use
67 * the scan request or not ... if it accesses the dev
68 * in there (it shouldn't anyway) then it may crash.
69 */
70 if (!leak)
71 kfree(request);
72 }
73
74 void __cfg80211_scan_done(struct work_struct *wk)
75 {
76 struct cfg80211_registered_device *rdev;
77
78 rdev = container_of(wk, struct cfg80211_registered_device,
79 scan_done_wk);
80
81 cfg80211_lock_rdev(rdev);
82 ___cfg80211_scan_done(rdev, false);
83 cfg80211_unlock_rdev(rdev);
84 }
85
86 void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
87 {
88 WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);
89
90 request->aborted = aborted;
91 queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk);
92 }
93 EXPORT_SYMBOL(cfg80211_scan_done);
94
95 static void bss_release(struct kref *ref)
96 {
97 struct cfg80211_internal_bss *bss;
98
99 bss = container_of(ref, struct cfg80211_internal_bss, ref);
100 if (bss->pub.free_priv)
101 bss->pub.free_priv(&bss->pub);
102
103 if (bss->ies_allocated)
104 kfree(bss->pub.information_elements);
105
106 BUG_ON(atomic_read(&bss->hold));
107
108 kfree(bss);
109 }
110
111 /* must hold dev->bss_lock! */
112 void cfg80211_bss_age(struct cfg80211_registered_device *dev,
113 unsigned long age_secs)
114 {
115 struct cfg80211_internal_bss *bss;
116 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
117
118 list_for_each_entry(bss, &dev->bss_list, list) {
119 bss->ts -= age_jiffies;
120 }
121 }
122
123 /* must hold dev->bss_lock! */
124 void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
125 {
126 struct cfg80211_internal_bss *bss, *tmp;
127 bool expired = false;
128
129 list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
130 if (atomic_read(&bss->hold))
131 continue;
132 if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE))
133 continue;
134 list_del(&bss->list);
135 rb_erase(&bss->rbn, &dev->bss_tree);
136 kref_put(&bss->ref, bss_release);
137 expired = true;
138 }
139
140 if (expired)
141 dev->bss_generation++;
142 }
143
144 static u8 *find_ie(u8 num, u8 *ies, int len)
145 {
146 while (len > 2 && ies[0] != num) {
147 len -= ies[1] + 2;
148 ies += ies[1] + 2;
149 }
150 if (len < 2)
151 return NULL;
152 if (len < 2 + ies[1])
153 return NULL;
154 return ies;
155 }
156
157 static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
158 {
159 const u8 *ie1 = find_ie(num, ies1, len1);
160 const u8 *ie2 = find_ie(num, ies2, len2);
161 int r;
162
163 if (!ie1 && !ie2)
164 return 0;
165 if (!ie1 || !ie2)
166 return -1;
167
168 r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1]));
169 if (r == 0 && ie1[1] != ie2[1])
170 return ie2[1] - ie1[1];
171 return r;
172 }
173
174 static bool is_bss(struct cfg80211_bss *a,
175 const u8 *bssid,
176 const u8 *ssid, size_t ssid_len)
177 {
178 const u8 *ssidie;
179
180 if (bssid && compare_ether_addr(a->bssid, bssid))
181 return false;
182
183 if (!ssid)
184 return true;
185
186 ssidie = find_ie(WLAN_EID_SSID,
187 a->information_elements,
188 a->len_information_elements);
189 if (!ssidie)
190 return false;
191 if (ssidie[1] != ssid_len)
192 return false;
193 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
194 }
195
196 static bool is_mesh(struct cfg80211_bss *a,
197 const u8 *meshid, size_t meshidlen,
198 const u8 *meshcfg)
199 {
200 const u8 *ie;
201
202 if (!is_zero_ether_addr(a->bssid))
203 return false;
204
205 ie = find_ie(WLAN_EID_MESH_ID,
206 a->information_elements,
207 a->len_information_elements);
208 if (!ie)
209 return false;
210 if (ie[1] != meshidlen)
211 return false;
212 if (memcmp(ie + 2, meshid, meshidlen))
213 return false;
214
215 ie = find_ie(WLAN_EID_MESH_CONFIG,
216 a->information_elements,
217 a->len_information_elements);
218 if (!ie)
219 return false;
220 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
221 return false;
222
223 /*
224 * Ignore mesh capability (last two bytes of the IE) when
225 * comparing since that may differ between stations taking
226 * part in the same mesh.
227 */
228 return memcmp(ie + 2, meshcfg,
229 sizeof(struct ieee80211_meshconf_ie) - 2) == 0;
230 }
231
232 static int cmp_bss(struct cfg80211_bss *a,
233 struct cfg80211_bss *b)
234 {
235 int r;
236
237 if (a->channel != b->channel)
238 return b->channel->center_freq - a->channel->center_freq;
239
240 r = memcmp(a->bssid, b->bssid, ETH_ALEN);
241 if (r)
242 return r;
243
244 if (is_zero_ether_addr(a->bssid)) {
245 r = cmp_ies(WLAN_EID_MESH_ID,
246 a->information_elements,
247 a->len_information_elements,
248 b->information_elements,
249 b->len_information_elements);
250 if (r)
251 return r;
252 return cmp_ies(WLAN_EID_MESH_CONFIG,
253 a->information_elements,
254 a->len_information_elements,
255 b->information_elements,
256 b->len_information_elements);
257 }
258
259 return cmp_ies(WLAN_EID_SSID,
260 a->information_elements,
261 a->len_information_elements,
262 b->information_elements,
263 b->len_information_elements);
264 }
265
266 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
267 struct ieee80211_channel *channel,
268 const u8 *bssid,
269 const u8 *ssid, size_t ssid_len,
270 u16 capa_mask, u16 capa_val)
271 {
272 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
273 struct cfg80211_internal_bss *bss, *res = NULL;
274
275 spin_lock_bh(&dev->bss_lock);
276
277 list_for_each_entry(bss, &dev->bss_list, list) {
278 if ((bss->pub.capability & capa_mask) != capa_val)
279 continue;
280 if (channel && bss->pub.channel != channel)
281 continue;
282 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
283 res = bss;
284 kref_get(&res->ref);
285 break;
286 }
287 }
288
289 spin_unlock_bh(&dev->bss_lock);
290 if (!res)
291 return NULL;
292 return &res->pub;
293 }
294 EXPORT_SYMBOL(cfg80211_get_bss);
295
296 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
297 struct ieee80211_channel *channel,
298 const u8 *meshid, size_t meshidlen,
299 const u8 *meshcfg)
300 {
301 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
302 struct cfg80211_internal_bss *bss, *res = NULL;
303
304 spin_lock_bh(&dev->bss_lock);
305
306 list_for_each_entry(bss, &dev->bss_list, list) {
307 if (channel && bss->pub.channel != channel)
308 continue;
309 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
310 res = bss;
311 kref_get(&res->ref);
312 break;
313 }
314 }
315
316 spin_unlock_bh(&dev->bss_lock);
317 if (!res)
318 return NULL;
319 return &res->pub;
320 }
321 EXPORT_SYMBOL(cfg80211_get_mesh);
322
323
324 static void rb_insert_bss(struct cfg80211_registered_device *dev,
325 struct cfg80211_internal_bss *bss)
326 {
327 struct rb_node **p = &dev->bss_tree.rb_node;
328 struct rb_node *parent = NULL;
329 struct cfg80211_internal_bss *tbss;
330 int cmp;
331
332 while (*p) {
333 parent = *p;
334 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
335
336 cmp = cmp_bss(&bss->pub, &tbss->pub);
337
338 if (WARN_ON(!cmp)) {
339 /* will sort of leak this BSS */
340 return;
341 }
342
343 if (cmp < 0)
344 p = &(*p)->rb_left;
345 else
346 p = &(*p)->rb_right;
347 }
348
349 rb_link_node(&bss->rbn, parent, p);
350 rb_insert_color(&bss->rbn, &dev->bss_tree);
351 }
352
353 static struct cfg80211_internal_bss *
354 rb_find_bss(struct cfg80211_registered_device *dev,
355 struct cfg80211_internal_bss *res)
356 {
357 struct rb_node *n = dev->bss_tree.rb_node;
358 struct cfg80211_internal_bss *bss;
359 int r;
360
361 while (n) {
362 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
363 r = cmp_bss(&res->pub, &bss->pub);
364
365 if (r == 0)
366 return bss;
367 else if (r < 0)
368 n = n->rb_left;
369 else
370 n = n->rb_right;
371 }
372
373 return NULL;
374 }
375
376 static struct cfg80211_internal_bss *
377 cfg80211_bss_update(struct cfg80211_registered_device *dev,
378 struct cfg80211_internal_bss *res,
379 bool overwrite)
380 {
381 struct cfg80211_internal_bss *found = NULL;
382 const u8 *meshid, *meshcfg;
383
384 /*
385 * The reference to "res" is donated to this function.
386 */
387
388 if (WARN_ON(!res->pub.channel)) {
389 kref_put(&res->ref, bss_release);
390 return NULL;
391 }
392
393 res->ts = jiffies;
394
395 if (is_zero_ether_addr(res->pub.bssid)) {
396 /* must be mesh, verify */
397 meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements,
398 res->pub.len_information_elements);
399 meshcfg = find_ie(WLAN_EID_MESH_CONFIG,
400 res->pub.information_elements,
401 res->pub.len_information_elements);
402 if (!meshid || !meshcfg ||
403 meshcfg[1] != sizeof(struct ieee80211_meshconf_ie)) {
404 /* bogus mesh */
405 kref_put(&res->ref, bss_release);
406 return NULL;
407 }
408 }
409
410 spin_lock_bh(&dev->bss_lock);
411
412 found = rb_find_bss(dev, res);
413
414 if (found) {
415 found->pub.beacon_interval = res->pub.beacon_interval;
416 found->pub.tsf = res->pub.tsf;
417 found->pub.signal = res->pub.signal;
418 found->pub.capability = res->pub.capability;
419 found->ts = res->ts;
420
421 /* overwrite IEs */
422 if (overwrite) {
423 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
424 size_t ielen = res->pub.len_information_elements;
425
426 if (!found->ies_allocated && ksize(found) >= used + ielen) {
427 memcpy(found->pub.information_elements,
428 res->pub.information_elements, ielen);
429 found->pub.len_information_elements = ielen;
430 } else {
431 u8 *ies = found->pub.information_elements;
432
433 if (found->ies_allocated)
434 ies = krealloc(ies, ielen, GFP_ATOMIC);
435 else
436 ies = kmalloc(ielen, GFP_ATOMIC);
437
438 if (ies) {
439 memcpy(ies, res->pub.information_elements, ielen);
440 found->ies_allocated = true;
441 found->pub.information_elements = ies;
442 found->pub.len_information_elements = ielen;
443 }
444 }
445 }
446
447 kref_put(&res->ref, bss_release);
448 } else {
449 /* this "consumes" the reference */
450 list_add_tail(&res->list, &dev->bss_list);
451 rb_insert_bss(dev, res);
452 found = res;
453 }
454
455 dev->bss_generation++;
456 spin_unlock_bh(&dev->bss_lock);
457
458 kref_get(&found->ref);
459 return found;
460 }
461
462 struct cfg80211_bss*
463 cfg80211_inform_bss(struct wiphy *wiphy,
464 struct ieee80211_channel *channel,
465 const u8 *bssid,
466 u64 timestamp, u16 capability, u16 beacon_interval,
467 const u8 *ie, size_t ielen,
468 s32 signal, gfp_t gfp)
469 {
470 struct cfg80211_internal_bss *res;
471 size_t privsz;
472
473 if (WARN_ON(!wiphy))
474 return NULL;
475
476 privsz = wiphy->bss_priv_size;
477
478 if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC &&
479 (signal < 0 || signal > 100)))
480 return NULL;
481
482 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
483 if (!res)
484 return NULL;
485
486 memcpy(res->pub.bssid, bssid, ETH_ALEN);
487 res->pub.channel = channel;
488 res->pub.signal = signal;
489 res->pub.tsf = timestamp;
490 res->pub.beacon_interval = beacon_interval;
491 res->pub.capability = capability;
492 /* point to after the private area */
493 res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz;
494 memcpy(res->pub.information_elements, ie, ielen);
495 res->pub.len_information_elements = ielen;
496
497 kref_init(&res->ref);
498
499 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, 0);
500 if (!res)
501 return NULL;
502
503 if (res->pub.capability & WLAN_CAPABILITY_ESS)
504 regulatory_hint_found_beacon(wiphy, channel, gfp);
505
506 /* cfg80211_bss_update gives us a referenced result */
507 return &res->pub;
508 }
509 EXPORT_SYMBOL(cfg80211_inform_bss);
510
511 struct cfg80211_bss *
512 cfg80211_inform_bss_frame(struct wiphy *wiphy,
513 struct ieee80211_channel *channel,
514 struct ieee80211_mgmt *mgmt, size_t len,
515 s32 signal, gfp_t gfp)
516 {
517 struct cfg80211_internal_bss *res;
518 size_t ielen = len - offsetof(struct ieee80211_mgmt,
519 u.probe_resp.variable);
520 bool overwrite;
521 size_t privsz = wiphy->bss_priv_size;
522
523 if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC &&
524 (signal < 0 || signal > 100)))
525 return NULL;
526
527 if (WARN_ON(!mgmt || !wiphy ||
528 len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
529 return NULL;
530
531 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
532 if (!res)
533 return NULL;
534
535 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
536 res->pub.channel = channel;
537 res->pub.signal = signal;
538 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
539 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
540 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
541 /* point to after the private area */
542 res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz;
543 memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen);
544 res->pub.len_information_elements = ielen;
545
546 kref_init(&res->ref);
547
548 overwrite = ieee80211_is_probe_resp(mgmt->frame_control);
549
550 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite);
551 if (!res)
552 return NULL;
553
554 if (res->pub.capability & WLAN_CAPABILITY_ESS)
555 regulatory_hint_found_beacon(wiphy, channel, gfp);
556
557 /* cfg80211_bss_update gives us a referenced result */
558 return &res->pub;
559 }
560 EXPORT_SYMBOL(cfg80211_inform_bss_frame);
561
562 void cfg80211_put_bss(struct cfg80211_bss *pub)
563 {
564 struct cfg80211_internal_bss *bss;
565
566 if (!pub)
567 return;
568
569 bss = container_of(pub, struct cfg80211_internal_bss, pub);
570 kref_put(&bss->ref, bss_release);
571 }
572 EXPORT_SYMBOL(cfg80211_put_bss);
573
574 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
575 {
576 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
577 struct cfg80211_internal_bss *bss;
578
579 if (WARN_ON(!pub))
580 return;
581
582 bss = container_of(pub, struct cfg80211_internal_bss, pub);
583
584 spin_lock_bh(&dev->bss_lock);
585
586 list_del(&bss->list);
587 dev->bss_generation++;
588 rb_erase(&bss->rbn, &dev->bss_tree);
589
590 spin_unlock_bh(&dev->bss_lock);
591
592 kref_put(&bss->ref, bss_release);
593 }
594 EXPORT_SYMBOL(cfg80211_unlink_bss);
595
596 #ifdef CONFIG_CFG80211_WEXT
597 int cfg80211_wext_siwscan(struct net_device *dev,
598 struct iw_request_info *info,
599 union iwreq_data *wrqu, char *extra)
600 {
601 struct cfg80211_registered_device *rdev;
602 struct wiphy *wiphy;
603 struct iw_scan_req *wreq = NULL;
604 struct cfg80211_scan_request *creq;
605 int i, err, n_channels = 0;
606 enum ieee80211_band band;
607
608 if (!netif_running(dev))
609 return -ENETDOWN;
610
611 if (wrqu->data.length == sizeof(struct iw_scan_req))
612 wreq = (struct iw_scan_req *)extra;
613
614 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
615
616 if (IS_ERR(rdev))
617 return PTR_ERR(rdev);
618
619 if (rdev->scan_req) {
620 err = -EBUSY;
621 goto out;
622 }
623
624 wiphy = &rdev->wiphy;
625
626 /* Determine number of channels, needed to allocate creq */
627 if (wreq && wreq->num_channels)
628 n_channels = wreq->num_channels;
629 else {
630 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
631 if (wiphy->bands[band])
632 n_channels += wiphy->bands[band]->n_channels;
633 }
634
635 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
636 n_channels * sizeof(void *),
637 GFP_ATOMIC);
638 if (!creq) {
639 err = -ENOMEM;
640 goto out;
641 }
642
643 creq->wiphy = wiphy;
644 creq->dev = dev;
645 /* SSIDs come after channels */
646 creq->ssids = (void *)&creq->channels[n_channels];
647 creq->n_channels = n_channels;
648 creq->n_ssids = 1;
649
650 /* translate "Scan on frequencies" request */
651 i = 0;
652 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
653 int j;
654
655 if (!wiphy->bands[band])
656 continue;
657
658 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
659 /* ignore disabled channels */
660 if (wiphy->bands[band]->channels[j].flags &
661 IEEE80211_CHAN_DISABLED)
662 continue;
663
664 /* If we have a wireless request structure and the
665 * wireless request specifies frequencies, then search
666 * for the matching hardware channel.
667 */
668 if (wreq && wreq->num_channels) {
669 int k;
670 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
671 for (k = 0; k < wreq->num_channels; k++) {
672 int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]);
673 if (wext_freq == wiphy_freq)
674 goto wext_freq_found;
675 }
676 goto wext_freq_not_found;
677 }
678
679 wext_freq_found:
680 creq->channels[i] = &wiphy->bands[band]->channels[j];
681 i++;
682 wext_freq_not_found: ;
683 }
684 }
685 /* No channels found? */
686 if (!i) {
687 err = -EINVAL;
688 goto out;
689 }
690
691 /* Set real number of channels specified in creq->channels[] */
692 creq->n_channels = i;
693
694 /* translate "Scan for SSID" request */
695 if (wreq) {
696 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
697 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN)
698 return -EINVAL;
699 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
700 creq->ssids[0].ssid_len = wreq->essid_len;
701 }
702 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
703 creq->n_ssids = 0;
704 }
705
706 rdev->scan_req = creq;
707 err = rdev->ops->scan(wiphy, dev, creq);
708 if (err) {
709 rdev->scan_req = NULL;
710 kfree(creq);
711 } else {
712 nl80211_send_scan_start(rdev, dev);
713 dev_hold(dev);
714 }
715 out:
716 cfg80211_unlock_rdev(rdev);
717 return err;
718 }
719 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
720
721 static void ieee80211_scan_add_ies(struct iw_request_info *info,
722 struct cfg80211_bss *bss,
723 char **current_ev, char *end_buf)
724 {
725 u8 *pos, *end, *next;
726 struct iw_event iwe;
727
728 if (!bss->information_elements ||
729 !bss->len_information_elements)
730 return;
731
732 /*
733 * If needed, fragment the IEs buffer (at IE boundaries) into short
734 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
735 */
736 pos = bss->information_elements;
737 end = pos + bss->len_information_elements;
738
739 while (end - pos > IW_GENERIC_IE_MAX) {
740 next = pos + 2 + pos[1];
741 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
742 next = next + 2 + next[1];
743
744 memset(&iwe, 0, sizeof(iwe));
745 iwe.cmd = IWEVGENIE;
746 iwe.u.data.length = next - pos;
747 *current_ev = iwe_stream_add_point(info, *current_ev,
748 end_buf, &iwe, pos);
749
750 pos = next;
751 }
752
753 if (end > pos) {
754 memset(&iwe, 0, sizeof(iwe));
755 iwe.cmd = IWEVGENIE;
756 iwe.u.data.length = end - pos;
757 *current_ev = iwe_stream_add_point(info, *current_ev,
758 end_buf, &iwe, pos);
759 }
760 }
761
762 static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
763 {
764 unsigned long end = jiffies;
765
766 if (end >= start)
767 return jiffies_to_msecs(end - start);
768
769 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
770 }
771
772 static char *
773 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
774 struct cfg80211_internal_bss *bss, char *current_ev,
775 char *end_buf)
776 {
777 struct iw_event iwe;
778 u8 *buf, *cfg, *p;
779 u8 *ie = bss->pub.information_elements;
780 int rem = bss->pub.len_information_elements, i, sig;
781 bool ismesh = false;
782
783 memset(&iwe, 0, sizeof(iwe));
784 iwe.cmd = SIOCGIWAP;
785 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
786 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
787 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
788 IW_EV_ADDR_LEN);
789
790 memset(&iwe, 0, sizeof(iwe));
791 iwe.cmd = SIOCGIWFREQ;
792 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
793 iwe.u.freq.e = 0;
794 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
795 IW_EV_FREQ_LEN);
796
797 memset(&iwe, 0, sizeof(iwe));
798 iwe.cmd = SIOCGIWFREQ;
799 iwe.u.freq.m = bss->pub.channel->center_freq;
800 iwe.u.freq.e = 6;
801 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
802 IW_EV_FREQ_LEN);
803
804 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
805 memset(&iwe, 0, sizeof(iwe));
806 iwe.cmd = IWEVQUAL;
807 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
808 IW_QUAL_NOISE_INVALID |
809 IW_QUAL_QUAL_UPDATED;
810 switch (wiphy->signal_type) {
811 case CFG80211_SIGNAL_TYPE_MBM:
812 sig = bss->pub.signal / 100;
813 iwe.u.qual.level = sig;
814 iwe.u.qual.updated |= IW_QUAL_DBM;
815 if (sig < -110) /* rather bad */
816 sig = -110;
817 else if (sig > -40) /* perfect */
818 sig = -40;
819 /* will give a range of 0 .. 70 */
820 iwe.u.qual.qual = sig + 110;
821 break;
822 case CFG80211_SIGNAL_TYPE_UNSPEC:
823 iwe.u.qual.level = bss->pub.signal;
824 /* will give range 0 .. 100 */
825 iwe.u.qual.qual = bss->pub.signal;
826 break;
827 default:
828 /* not reached */
829 break;
830 }
831 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
832 &iwe, IW_EV_QUAL_LEN);
833 }
834
835 memset(&iwe, 0, sizeof(iwe));
836 iwe.cmd = SIOCGIWENCODE;
837 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
838 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
839 else
840 iwe.u.data.flags = IW_ENCODE_DISABLED;
841 iwe.u.data.length = 0;
842 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
843 &iwe, "");
844
845 while (rem >= 2) {
846 /* invalid data */
847 if (ie[1] > rem - 2)
848 break;
849
850 switch (ie[0]) {
851 case WLAN_EID_SSID:
852 memset(&iwe, 0, sizeof(iwe));
853 iwe.cmd = SIOCGIWESSID;
854 iwe.u.data.length = ie[1];
855 iwe.u.data.flags = 1;
856 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
857 &iwe, ie + 2);
858 break;
859 case WLAN_EID_MESH_ID:
860 memset(&iwe, 0, sizeof(iwe));
861 iwe.cmd = SIOCGIWESSID;
862 iwe.u.data.length = ie[1];
863 iwe.u.data.flags = 1;
864 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
865 &iwe, ie + 2);
866 break;
867 case WLAN_EID_MESH_CONFIG:
868 ismesh = true;
869 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
870 break;
871 buf = kmalloc(50, GFP_ATOMIC);
872 if (!buf)
873 break;
874 cfg = ie + 2;
875 memset(&iwe, 0, sizeof(iwe));
876 iwe.cmd = IWEVCUSTOM;
877 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
878 "0x%02X", cfg[0]);
879 iwe.u.data.length = strlen(buf);
880 current_ev = iwe_stream_add_point(info, current_ev,
881 end_buf,
882 &iwe, buf);
883 sprintf(buf, "Path Selection Metric ID: 0x%02X",
884 cfg[1]);
885 iwe.u.data.length = strlen(buf);
886 current_ev = iwe_stream_add_point(info, current_ev,
887 end_buf,
888 &iwe, buf);
889 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
890 cfg[2]);
891 iwe.u.data.length = strlen(buf);
892 current_ev = iwe_stream_add_point(info, current_ev,
893 end_buf,
894 &iwe, buf);
895 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
896 iwe.u.data.length = strlen(buf);
897 current_ev = iwe_stream_add_point(info, current_ev,
898 end_buf,
899 &iwe, buf);
900 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
901 iwe.u.data.length = strlen(buf);
902 current_ev = iwe_stream_add_point(info, current_ev,
903 end_buf,
904 &iwe, buf);
905 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
906 iwe.u.data.length = strlen(buf);
907 current_ev = iwe_stream_add_point(info, current_ev,
908 end_buf,
909 &iwe, buf);
910 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
911 iwe.u.data.length = strlen(buf);
912 current_ev = iwe_stream_add_point(info, current_ev,
913 end_buf,
914 &iwe, buf);
915 kfree(buf);
916 break;
917 case WLAN_EID_SUPP_RATES:
918 case WLAN_EID_EXT_SUPP_RATES:
919 /* display all supported rates in readable format */
920 p = current_ev + iwe_stream_lcp_len(info);
921
922 memset(&iwe, 0, sizeof(iwe));
923 iwe.cmd = SIOCGIWRATE;
924 /* Those two flags are ignored... */
925 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
926
927 for (i = 0; i < ie[1]; i++) {
928 iwe.u.bitrate.value =
929 ((ie[i + 2] & 0x7f) * 500000);
930 p = iwe_stream_add_value(info, current_ev, p,
931 end_buf, &iwe, IW_EV_PARAM_LEN);
932 }
933 current_ev = p;
934 break;
935 }
936 rem -= ie[1] + 2;
937 ie += ie[1] + 2;
938 }
939
940 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
941 ismesh) {
942 memset(&iwe, 0, sizeof(iwe));
943 iwe.cmd = SIOCGIWMODE;
944 if (ismesh)
945 iwe.u.mode = IW_MODE_MESH;
946 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
947 iwe.u.mode = IW_MODE_MASTER;
948 else
949 iwe.u.mode = IW_MODE_ADHOC;
950 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
951 &iwe, IW_EV_UINT_LEN);
952 }
953
954 buf = kmalloc(30, GFP_ATOMIC);
955 if (buf) {
956 memset(&iwe, 0, sizeof(iwe));
957 iwe.cmd = IWEVCUSTOM;
958 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
959 iwe.u.data.length = strlen(buf);
960 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
961 &iwe, buf);
962 memset(&iwe, 0, sizeof(iwe));
963 iwe.cmd = IWEVCUSTOM;
964 sprintf(buf, " Last beacon: %ums ago",
965 elapsed_jiffies_msecs(bss->ts));
966 iwe.u.data.length = strlen(buf);
967 current_ev = iwe_stream_add_point(info, current_ev,
968 end_buf, &iwe, buf);
969 kfree(buf);
970 }
971
972 ieee80211_scan_add_ies(info, &bss->pub, &current_ev, end_buf);
973
974 return current_ev;
975 }
976
977
978 static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
979 struct iw_request_info *info,
980 char *buf, size_t len)
981 {
982 char *current_ev = buf;
983 char *end_buf = buf + len;
984 struct cfg80211_internal_bss *bss;
985
986 spin_lock_bh(&dev->bss_lock);
987 cfg80211_bss_expire(dev);
988
989 list_for_each_entry(bss, &dev->bss_list, list) {
990 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
991 spin_unlock_bh(&dev->bss_lock);
992 return -E2BIG;
993 }
994 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
995 current_ev, end_buf);
996 }
997 spin_unlock_bh(&dev->bss_lock);
998 return current_ev - buf;
999 }
1000
1001
1002 int cfg80211_wext_giwscan(struct net_device *dev,
1003 struct iw_request_info *info,
1004 struct iw_point *data, char *extra)
1005 {
1006 struct cfg80211_registered_device *rdev;
1007 int res;
1008
1009 if (!netif_running(dev))
1010 return -ENETDOWN;
1011
1012 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1013
1014 if (IS_ERR(rdev))
1015 return PTR_ERR(rdev);
1016
1017 if (rdev->scan_req) {
1018 res = -EAGAIN;
1019 goto out;
1020 }
1021
1022 res = ieee80211_scan_results(rdev, info, extra, data->length);
1023 data->length = 0;
1024 if (res >= 0) {
1025 data->length = res;
1026 res = 0;
1027 }
1028
1029 out:
1030 cfg80211_unlock_rdev(rdev);
1031 return res;
1032 }
1033 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);
1034 #endif
kernel-based virtual machine