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Staging: hv: move logging.h
[linux/fpc-iii.git] / net / wireless / scan.c
blob4c210c2debc6773e3b84b703a3ca3b5b3fd941b2
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_WIRELESS_EXT
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_WIRELESS_EXT
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 schedule_work(&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] != IEEE80211_MESH_CONFIG_LEN)
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, IEEE80211_MESH_CONFIG_LEN - 2) == 0;
229 }
230
231 static int cmp_bss(struct cfg80211_bss *a,
232 struct cfg80211_bss *b)
233 {
234 int r;
235
236 if (a->channel != b->channel)
237 return b->channel->center_freq - a->channel->center_freq;
238
239 r = memcmp(a->bssid, b->bssid, ETH_ALEN);
240 if (r)
241 return r;
242
243 if (is_zero_ether_addr(a->bssid)) {
244 r = cmp_ies(WLAN_EID_MESH_ID,
245 a->information_elements,
246 a->len_information_elements,
247 b->information_elements,
248 b->len_information_elements);
249 if (r)
250 return r;
251 return cmp_ies(WLAN_EID_MESH_CONFIG,
252 a->information_elements,
253 a->len_information_elements,
254 b->information_elements,
255 b->len_information_elements);
256 }
257
258 return cmp_ies(WLAN_EID_SSID,
259 a->information_elements,
260 a->len_information_elements,
261 b->information_elements,
262 b->len_information_elements);
263 }
264
265 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
266 struct ieee80211_channel *channel,
267 const u8 *bssid,
268 const u8 *ssid, size_t ssid_len,
269 u16 capa_mask, u16 capa_val)
270 {
271 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
272 struct cfg80211_internal_bss *bss, *res = NULL;
273
274 spin_lock_bh(&dev->bss_lock);
275
276 list_for_each_entry(bss, &dev->bss_list, list) {
277 if ((bss->pub.capability & capa_mask) != capa_val)
278 continue;
279 if (channel && bss->pub.channel != channel)
280 continue;
281 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
282 res = bss;
283 kref_get(&res->ref);
284 break;
285 }
286 }
287
288 spin_unlock_bh(&dev->bss_lock);
289 if (!res)
290 return NULL;
291 return &res->pub;
292 }
293 EXPORT_SYMBOL(cfg80211_get_bss);
294
295 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
296 struct ieee80211_channel *channel,
297 const u8 *meshid, size_t meshidlen,
298 const u8 *meshcfg)
299 {
300 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
301 struct cfg80211_internal_bss *bss, *res = NULL;
302
303 spin_lock_bh(&dev->bss_lock);
304
305 list_for_each_entry(bss, &dev->bss_list, list) {
306 if (channel && bss->pub.channel != channel)
307 continue;
308 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
309 res = bss;
310 kref_get(&res->ref);
311 break;
312 }
313 }
314
315 spin_unlock_bh(&dev->bss_lock);
316 if (!res)
317 return NULL;
318 return &res->pub;
319 }
320 EXPORT_SYMBOL(cfg80211_get_mesh);
321
322
323 static void rb_insert_bss(struct cfg80211_registered_device *dev,
324 struct cfg80211_internal_bss *bss)
325 {
326 struct rb_node **p = &dev->bss_tree.rb_node;
327 struct rb_node *parent = NULL;
328 struct cfg80211_internal_bss *tbss;
329 int cmp;
330
331 while (*p) {
332 parent = *p;
333 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
334
335 cmp = cmp_bss(&bss->pub, &tbss->pub);
336
337 if (WARN_ON(!cmp)) {
338 /* will sort of leak this BSS */
339 return;
340 }
341
342 if (cmp < 0)
343 p = &(*p)->rb_left;
344 else
345 p = &(*p)->rb_right;
346 }
347
348 rb_link_node(&bss->rbn, parent, p);
349 rb_insert_color(&bss->rbn, &dev->bss_tree);
350 }
351
352 static struct cfg80211_internal_bss *
353 rb_find_bss(struct cfg80211_registered_device *dev,
354 struct cfg80211_internal_bss *res)
355 {
356 struct rb_node *n = dev->bss_tree.rb_node;
357 struct cfg80211_internal_bss *bss;
358 int r;
359
360 while (n) {
361 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
362 r = cmp_bss(&res->pub, &bss->pub);
363
364 if (r == 0)
365 return bss;
366 else if (r < 0)
367 n = n->rb_left;
368 else
369 n = n->rb_right;
370 }
371
372 return NULL;
373 }
374
375 static struct cfg80211_internal_bss *
376 cfg80211_bss_update(struct cfg80211_registered_device *dev,
377 struct cfg80211_internal_bss *res,
378 bool overwrite)
379 {
380 struct cfg80211_internal_bss *found = NULL;
381 const u8 *meshid, *meshcfg;
382
383 /*
384 * The reference to "res" is donated to this function.
385 */
386
387 if (WARN_ON(!res->pub.channel)) {
388 kref_put(&res->ref, bss_release);
389 return NULL;
390 }
391
392 res->ts = jiffies;
393
394 if (is_zero_ether_addr(res->pub.bssid)) {
395 /* must be mesh, verify */
396 meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements,
397 res->pub.len_information_elements);
398 meshcfg = find_ie(WLAN_EID_MESH_CONFIG,
399 res->pub.information_elements,
400 res->pub.len_information_elements);
401 if (!meshid || !meshcfg ||
402 meshcfg[1] != IEEE80211_MESH_CONFIG_LEN) {
403 /* bogus mesh */
404 kref_put(&res->ref, bss_release);
405 return NULL;
406 }
407 }
408
409 spin_lock_bh(&dev->bss_lock);
410
411 found = rb_find_bss(dev, res);
412
413 if (found) {
414 found->pub.beacon_interval = res->pub.beacon_interval;
415 found->pub.tsf = res->pub.tsf;
416 found->pub.signal = res->pub.signal;
417 found->pub.capability = res->pub.capability;
418 found->ts = res->ts;
419
420 /* overwrite IEs */
421 if (overwrite) {
422 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
423 size_t ielen = res->pub.len_information_elements;
424
425 if (!found->ies_allocated && ksize(found) >= used + ielen) {
426 memcpy(found->pub.information_elements,
427 res->pub.information_elements, ielen);
428 found->pub.len_information_elements = ielen;
429 } else {
430 u8 *ies = found->pub.information_elements;
431
432 if (found->ies_allocated)
433 ies = krealloc(ies, ielen, GFP_ATOMIC);
434 else
435 ies = kmalloc(ielen, GFP_ATOMIC);
436
437 if (ies) {
438 memcpy(ies, res->pub.information_elements, ielen);
439 found->ies_allocated = true;
440 found->pub.information_elements = ies;
441 found->pub.len_information_elements = ielen;
442 }
443 }
444 }
445
446 kref_put(&res->ref, bss_release);
447 } else {
448 /* this "consumes" the reference */
449 list_add_tail(&res->list, &dev->bss_list);
450 rb_insert_bss(dev, res);
451 found = res;
452 }
453
454 dev->bss_generation++;
455 spin_unlock_bh(&dev->bss_lock);
456
457 kref_get(&found->ref);
458 return found;
459 }
460
461 struct cfg80211_bss*
462 cfg80211_inform_bss(struct wiphy *wiphy,
463 struct ieee80211_channel *channel,
464 const u8 *bssid,
465 u64 timestamp, u16 capability, u16 beacon_interval,
466 const u8 *ie, size_t ielen,
467 s32 signal, gfp_t gfp)
468 {
469 struct cfg80211_internal_bss *res;
470 size_t privsz;
471
472 if (WARN_ON(!wiphy))
473 return NULL;
474
475 privsz = wiphy->bss_priv_size;
476
477 if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC &&
478 (signal < 0 || signal > 100)))
479 return NULL;
480
481 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
482 if (!res)
483 return NULL;
484
485 memcpy(res->pub.bssid, bssid, ETH_ALEN);
486 res->pub.channel = channel;
487 res->pub.signal = signal;
488 res->pub.tsf = timestamp;
489 res->pub.beacon_interval = beacon_interval;
490 res->pub.capability = capability;
491 /* point to after the private area */
492 res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz;
493 memcpy(res->pub.information_elements, ie, ielen);
494 res->pub.len_information_elements = ielen;
495
496 kref_init(&res->ref);
497
498 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, 0);
499 if (!res)
500 return NULL;
501
502 if (res->pub.capability & WLAN_CAPABILITY_ESS)
503 regulatory_hint_found_beacon(wiphy, channel, gfp);
504
505 /* cfg80211_bss_update gives us a referenced result */
506 return &res->pub;
507 }
508 EXPORT_SYMBOL(cfg80211_inform_bss);
509
510 struct cfg80211_bss *
511 cfg80211_inform_bss_frame(struct wiphy *wiphy,
512 struct ieee80211_channel *channel,
513 struct ieee80211_mgmt *mgmt, size_t len,
514 s32 signal, gfp_t gfp)
515 {
516 struct cfg80211_internal_bss *res;
517 size_t ielen = len - offsetof(struct ieee80211_mgmt,
518 u.probe_resp.variable);
519 bool overwrite;
520 size_t privsz = wiphy->bss_priv_size;
521
522 if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC &&
523 (signal < 0 || signal > 100)))
524 return NULL;
525
526 if (WARN_ON(!mgmt || !wiphy ||
527 len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
528 return NULL;
529
530 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
531 if (!res)
532 return NULL;
533
534 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
535 res->pub.channel = channel;
536 res->pub.signal = signal;
537 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
538 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
539 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
540 /* point to after the private area */
541 res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz;
542 memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen);
543 res->pub.len_information_elements = ielen;
544
545 kref_init(&res->ref);
546
547 overwrite = ieee80211_is_probe_resp(mgmt->frame_control);
548
549 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite);
550 if (!res)
551 return NULL;
552
553 if (res->pub.capability & WLAN_CAPABILITY_ESS)
554 regulatory_hint_found_beacon(wiphy, channel, gfp);
555
556 /* cfg80211_bss_update gives us a referenced result */
557 return &res->pub;
558 }
559 EXPORT_SYMBOL(cfg80211_inform_bss_frame);
560
561 void cfg80211_put_bss(struct cfg80211_bss *pub)
562 {
563 struct cfg80211_internal_bss *bss;
564
565 if (!pub)
566 return;
567
568 bss = container_of(pub, struct cfg80211_internal_bss, pub);
569 kref_put(&bss->ref, bss_release);
570 }
571 EXPORT_SYMBOL(cfg80211_put_bss);
572
573 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
574 {
575 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
576 struct cfg80211_internal_bss *bss;
577
578 if (WARN_ON(!pub))
579 return;
580
581 bss = container_of(pub, struct cfg80211_internal_bss, pub);
582
583 spin_lock_bh(&dev->bss_lock);
584
585 list_del(&bss->list);
586 dev->bss_generation++;
587 rb_erase(&bss->rbn, &dev->bss_tree);
588
589 spin_unlock_bh(&dev->bss_lock);
590
591 kref_put(&bss->ref, bss_release);
592 }
593 EXPORT_SYMBOL(cfg80211_unlink_bss);
594
595 #ifdef CONFIG_WIRELESS_EXT
596 int cfg80211_wext_siwscan(struct net_device *dev,
597 struct iw_request_info *info,
598 union iwreq_data *wrqu, char *extra)
599 {
600 struct cfg80211_registered_device *rdev;
601 struct wiphy *wiphy;
602 struct iw_scan_req *wreq = NULL;
603 struct cfg80211_scan_request *creq;
604 int i, err, n_channels = 0;
605 enum ieee80211_band band;
606
607 if (!netif_running(dev))
608 return -ENETDOWN;
609
610 if (wrqu->data.length == sizeof(struct iw_scan_req))
611 wreq = (struct iw_scan_req *)extra;
612
613 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
614
615 if (IS_ERR(rdev))
616 return PTR_ERR(rdev);
617
618 if (rdev->scan_req) {
619 err = -EBUSY;
620 goto out;
621 }
622
623 wiphy = &rdev->wiphy;
624
625 /* Determine number of channels, needed to allocate creq */
626 if (wreq && wreq->num_channels)
627 n_channels = wreq->num_channels;
628 else {
629 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
630 if (wiphy->bands[band])
631 n_channels += wiphy->bands[band]->n_channels;
632 }
633
634 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
635 n_channels * sizeof(void *),
636 GFP_ATOMIC);
637 if (!creq) {
638 err = -ENOMEM;
639 goto out;
640 }
641
642 creq->wiphy = wiphy;
643 creq->dev = dev;
644 /* SSIDs come after channels */
645 creq->ssids = (void *)&creq->channels[n_channels];
646 creq->n_channels = n_channels;
647 creq->n_ssids = 1;
648
649 /* translate "Scan on frequencies" request */
650 i = 0;
651 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
652 int j;
653 if (!wiphy->bands[band])
654 continue;
655 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
656
657 /* If we have a wireless request structure and the
658 * wireless request specifies frequencies, then search
659 * for the matching hardware channel.
660 */
661 if (wreq && wreq->num_channels) {
662 int k;
663 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
664 for (k = 0; k < wreq->num_channels; k++) {
665 int wext_freq = wreq->channel_list[k].m / 100000;
666 if (wext_freq == wiphy_freq)
667 goto wext_freq_found;
668 }
669 goto wext_freq_not_found;
670 }
671
672 wext_freq_found:
673 creq->channels[i] = &wiphy->bands[band]->channels[j];
674 i++;
675 wext_freq_not_found: ;
676 }
677 }
678
679 /* Set real number of channels specified in creq->channels[] */
680 creq->n_channels = i;
681
682 /* translate "Scan for SSID" request */
683 if (wreq) {
684 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
685 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN)
686 return -EINVAL;
687 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
688 creq->ssids[0].ssid_len = wreq->essid_len;
689 }
690 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
691 creq->n_ssids = 0;
692 }
693
694 rdev->scan_req = creq;
695 err = rdev->ops->scan(wiphy, dev, creq);
696 if (err) {
697 rdev->scan_req = NULL;
698 kfree(creq);
699 } else {
700 nl80211_send_scan_start(rdev, dev);
701 dev_hold(dev);
702 }
703 out:
704 cfg80211_unlock_rdev(rdev);
705 return err;
706 }
707 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
708
709 static void ieee80211_scan_add_ies(struct iw_request_info *info,
710 struct cfg80211_bss *bss,
711 char **current_ev, char *end_buf)
712 {
713 u8 *pos, *end, *next;
714 struct iw_event iwe;
715
716 if (!bss->information_elements ||
717 !bss->len_information_elements)
718 return;
719
720 /*
721 * If needed, fragment the IEs buffer (at IE boundaries) into short
722 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
723 */
724 pos = bss->information_elements;
725 end = pos + bss->len_information_elements;
726
727 while (end - pos > IW_GENERIC_IE_MAX) {
728 next = pos + 2 + pos[1];
729 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
730 next = next + 2 + next[1];
731
732 memset(&iwe, 0, sizeof(iwe));
733 iwe.cmd = IWEVGENIE;
734 iwe.u.data.length = next - pos;
735 *current_ev = iwe_stream_add_point(info, *current_ev,
736 end_buf, &iwe, pos);
737
738 pos = next;
739 }
740
741 if (end > pos) {
742 memset(&iwe, 0, sizeof(iwe));
743 iwe.cmd = IWEVGENIE;
744 iwe.u.data.length = end - pos;
745 *current_ev = iwe_stream_add_point(info, *current_ev,
746 end_buf, &iwe, pos);
747 }
748 }
749
750 static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
751 {
752 unsigned long end = jiffies;
753
754 if (end >= start)
755 return jiffies_to_msecs(end - start);
756
757 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
758 }
759
760 static char *
761 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
762 struct cfg80211_internal_bss *bss, char *current_ev,
763 char *end_buf)
764 {
765 struct iw_event iwe;
766 u8 *buf, *cfg, *p;
767 u8 *ie = bss->pub.information_elements;
768 int rem = bss->pub.len_information_elements, i, sig;
769 bool ismesh = false;
770
771 memset(&iwe, 0, sizeof(iwe));
772 iwe.cmd = SIOCGIWAP;
773 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
774 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
775 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
776 IW_EV_ADDR_LEN);
777
778 memset(&iwe, 0, sizeof(iwe));
779 iwe.cmd = SIOCGIWFREQ;
780 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
781 iwe.u.freq.e = 0;
782 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
783 IW_EV_FREQ_LEN);
784
785 memset(&iwe, 0, sizeof(iwe));
786 iwe.cmd = SIOCGIWFREQ;
787 iwe.u.freq.m = bss->pub.channel->center_freq;
788 iwe.u.freq.e = 6;
789 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
790 IW_EV_FREQ_LEN);
791
792 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
793 memset(&iwe, 0, sizeof(iwe));
794 iwe.cmd = IWEVQUAL;
795 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
796 IW_QUAL_NOISE_INVALID |
797 IW_QUAL_QUAL_UPDATED;
798 switch (wiphy->signal_type) {
799 case CFG80211_SIGNAL_TYPE_MBM:
800 sig = bss->pub.signal / 100;
801 iwe.u.qual.level = sig;
802 iwe.u.qual.updated |= IW_QUAL_DBM;
803 if (sig < -110) /* rather bad */
804 sig = -110;
805 else if (sig > -40) /* perfect */
806 sig = -40;
807 /* will give a range of 0 .. 70 */
808 iwe.u.qual.qual = sig + 110;
809 break;
810 case CFG80211_SIGNAL_TYPE_UNSPEC:
811 iwe.u.qual.level = bss->pub.signal;
812 /* will give range 0 .. 100 */
813 iwe.u.qual.qual = bss->pub.signal;
814 break;
815 default:
816 /* not reached */
817 break;
818 }
819 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
820 &iwe, IW_EV_QUAL_LEN);
821 }
822
823 memset(&iwe, 0, sizeof(iwe));
824 iwe.cmd = SIOCGIWENCODE;
825 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
826 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
827 else
828 iwe.u.data.flags = IW_ENCODE_DISABLED;
829 iwe.u.data.length = 0;
830 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
831 &iwe, "");
832
833 while (rem >= 2) {
834 /* invalid data */
835 if (ie[1] > rem - 2)
836 break;
837
838 switch (ie[0]) {
839 case WLAN_EID_SSID:
840 memset(&iwe, 0, sizeof(iwe));
841 iwe.cmd = SIOCGIWESSID;
842 iwe.u.data.length = ie[1];
843 iwe.u.data.flags = 1;
844 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
845 &iwe, ie + 2);
846 break;
847 case WLAN_EID_MESH_ID:
848 memset(&iwe, 0, sizeof(iwe));
849 iwe.cmd = SIOCGIWESSID;
850 iwe.u.data.length = ie[1];
851 iwe.u.data.flags = 1;
852 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
853 &iwe, ie + 2);
854 break;
855 case WLAN_EID_MESH_CONFIG:
856 ismesh = true;
857 if (ie[1] != IEEE80211_MESH_CONFIG_LEN)
858 break;
859 buf = kmalloc(50, GFP_ATOMIC);
860 if (!buf)
861 break;
862 cfg = ie + 2;
863 memset(&iwe, 0, sizeof(iwe));
864 iwe.cmd = IWEVCUSTOM;
865 sprintf(buf, "Mesh network (version %d)", cfg[0]);
866 iwe.u.data.length = strlen(buf);
867 current_ev = iwe_stream_add_point(info, current_ev,
868 end_buf,
869 &iwe, buf);
870 sprintf(buf, "Path Selection Protocol ID: "
871 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
872 cfg[4]);
873 iwe.u.data.length = strlen(buf);
874 current_ev = iwe_stream_add_point(info, current_ev,
875 end_buf,
876 &iwe, buf);
877 sprintf(buf, "Path Selection Metric ID: "
878 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
879 cfg[8]);
880 iwe.u.data.length = strlen(buf);
881 current_ev = iwe_stream_add_point(info, current_ev,
882 end_buf,
883 &iwe, buf);
884 sprintf(buf, "Congestion Control Mode ID: "
885 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
886 cfg[11], cfg[12]);
887 iwe.u.data.length = strlen(buf);
888 current_ev = iwe_stream_add_point(info, current_ev,
889 end_buf,
890 &iwe, buf);
891 sprintf(buf, "Channel Precedence: "
892 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
893 cfg[15], cfg[16]);
894 iwe.u.data.length = strlen(buf);
895 current_ev = iwe_stream_add_point(info, current_ev,
896 end_buf,
897 &iwe, buf);
898 kfree(buf);
899 break;
900 case WLAN_EID_SUPP_RATES:
901 case WLAN_EID_EXT_SUPP_RATES:
902 /* display all supported rates in readable format */
903 p = current_ev + iwe_stream_lcp_len(info);
904
905 memset(&iwe, 0, sizeof(iwe));
906 iwe.cmd = SIOCGIWRATE;
907 /* Those two flags are ignored... */
908 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
909
910 for (i = 0; i < ie[1]; i++) {
911 iwe.u.bitrate.value =
912 ((ie[i + 2] & 0x7f) * 500000);
913 p = iwe_stream_add_value(info, current_ev, p,
914 end_buf, &iwe, IW_EV_PARAM_LEN);
915 }
916 current_ev = p;
917 break;
918 }
919 rem -= ie[1] + 2;
920 ie += ie[1] + 2;
921 }
922
923 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
924 || ismesh) {
925 memset(&iwe, 0, sizeof(iwe));
926 iwe.cmd = SIOCGIWMODE;
927 if (ismesh)
928 iwe.u.mode = IW_MODE_MESH;
929 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
930 iwe.u.mode = IW_MODE_MASTER;
931 else
932 iwe.u.mode = IW_MODE_ADHOC;
933 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
934 &iwe, IW_EV_UINT_LEN);
935 }
936
937 buf = kmalloc(30, GFP_ATOMIC);
938 if (buf) {
939 memset(&iwe, 0, sizeof(iwe));
940 iwe.cmd = IWEVCUSTOM;
941 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
942 iwe.u.data.length = strlen(buf);
943 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
944 &iwe, buf);
945 memset(&iwe, 0, sizeof(iwe));
946 iwe.cmd = IWEVCUSTOM;
947 sprintf(buf, " Last beacon: %ums ago",
948 elapsed_jiffies_msecs(bss->ts));
949 iwe.u.data.length = strlen(buf);
950 current_ev = iwe_stream_add_point(info, current_ev,
951 end_buf, &iwe, buf);
952 kfree(buf);
953 }
954
955 ieee80211_scan_add_ies(info, &bss->pub, &current_ev, end_buf);
956
957 return current_ev;
958 }
959
960
961 static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
962 struct iw_request_info *info,
963 char *buf, size_t len)
964 {
965 char *current_ev = buf;
966 char *end_buf = buf + len;
967 struct cfg80211_internal_bss *bss;
968
969 spin_lock_bh(&dev->bss_lock);
970 cfg80211_bss_expire(dev);
971
972 list_for_each_entry(bss, &dev->bss_list, list) {
973 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
974 spin_unlock_bh(&dev->bss_lock);
975 return -E2BIG;
976 }
977 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
978 current_ev, end_buf);
979 }
980 spin_unlock_bh(&dev->bss_lock);
981 return current_ev - buf;
982 }
983
984
985 int cfg80211_wext_giwscan(struct net_device *dev,
986 struct iw_request_info *info,
987 struct iw_point *data, char *extra)
988 {
989 struct cfg80211_registered_device *rdev;
990 int res;
991
992 if (!netif_running(dev))
993 return -ENETDOWN;
994
995 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
996
997 if (IS_ERR(rdev))
998 return PTR_ERR(rdev);
999
1000 if (rdev->scan_req) {
1001 res = -EAGAIN;
1002 goto out;
1003 }
1004
1005 res = ieee80211_scan_results(rdev, info, extra, data->length);
1006 data->length = 0;
1007 if (res >= 0) {
1008 data->length = res;
1009 res = 0;
1010 }
1011
1012 out:
1013 cfg80211_unlock_rdev(rdev);
1014 return res;
1015 }
1016 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);
1017 #endif
Linux with added FPC-III support