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925399462a79fb7dd844fb27e60c50ac742cfb78
[deliverable/linux.git] / net / wireless / scan.c
1 /*
2 * cfg80211 scan result handling
3 *
4 * Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
5 */
6 #include <linux/kernel.h>
7 #include <linux/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
18 #define IEEE80211_SCAN_RESULT_EXPIRE (10 * HZ)
19
20 void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
21 {
22 struct net_device *dev;
23 #ifdef CONFIG_WIRELESS_EXT
24 union iwreq_data wrqu;
25 #endif
26
27 dev = dev_get_by_index(&init_net, request->ifidx);
28 if (!dev)
29 goto out;
30
31 WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);
32
33 /*
34 * This must be before sending the other events!
35 * Otherwise, wpa_supplicant gets completely confused with
36 * wext events.
37 */
38 cfg80211_sme_scan_done(dev);
39
40 if (aborted)
41 nl80211_send_scan_aborted(wiphy_to_dev(request->wiphy), dev);
42 else
43 nl80211_send_scan_done(wiphy_to_dev(request->wiphy), dev);
44
45 wiphy_to_dev(request->wiphy)->scan_req = NULL;
46
47 #ifdef CONFIG_WIRELESS_EXT
48 if (!aborted) {
49 memset(&wrqu, 0, sizeof(wrqu));
50
51 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
52 }
53 #endif
54
55 dev_put(dev);
56
57 out:
58 kfree(request);
59 }
60 EXPORT_SYMBOL(cfg80211_scan_done);
61
62 static void bss_release(struct kref *ref)
63 {
64 struct cfg80211_internal_bss *bss;
65
66 bss = container_of(ref, struct cfg80211_internal_bss, ref);
67 if (bss->pub.free_priv)
68 bss->pub.free_priv(&bss->pub);
69
70 if (bss->ies_allocated)
71 kfree(bss->pub.information_elements);
72
73 BUG_ON(atomic_read(&bss->hold));
74
75 kfree(bss);
76 }
77
78 /* must hold dev->bss_lock! */
79 void cfg80211_bss_age(struct cfg80211_registered_device *dev,
80 unsigned long age_secs)
81 {
82 struct cfg80211_internal_bss *bss;
83 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
84
85 list_for_each_entry(bss, &dev->bss_list, list) {
86 bss->ts -= age_jiffies;
87 }
88 }
89
90 /* must hold dev->bss_lock! */
91 void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
92 {
93 struct cfg80211_internal_bss *bss, *tmp;
94 bool expired = false;
95
96 list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
97 if (atomic_read(&bss->hold))
98 continue;
99 if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE))
100 continue;
101 list_del(&bss->list);
102 rb_erase(&bss->rbn, &dev->bss_tree);
103 kref_put(&bss->ref, bss_release);
104 expired = true;
105 }
106
107 if (expired)
108 dev->bss_generation++;
109 }
110
111 static u8 *find_ie(u8 num, u8 *ies, size_t len)
112 {
113 while (len > 2 && ies[0] != num) {
114 len -= ies[1] + 2;
115 ies += ies[1] + 2;
116 }
117 if (len < 2)
118 return NULL;
119 if (len < 2 + ies[1])
120 return NULL;
121 return ies;
122 }
123
124 static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
125 {
126 const u8 *ie1 = find_ie(num, ies1, len1);
127 const u8 *ie2 = find_ie(num, ies2, len2);
128 int r;
129
130 if (!ie1 && !ie2)
131 return 0;
132 if (!ie1)
133 return -1;
134
135 r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1]));
136 if (r == 0 && ie1[1] != ie2[1])
137 return ie2[1] - ie1[1];
138 return r;
139 }
140
141 static bool is_bss(struct cfg80211_bss *a,
142 const u8 *bssid,
143 const u8 *ssid, size_t ssid_len)
144 {
145 const u8 *ssidie;
146
147 if (bssid && compare_ether_addr(a->bssid, bssid))
148 return false;
149
150 if (!ssid)
151 return true;
152
153 ssidie = find_ie(WLAN_EID_SSID,
154 a->information_elements,
155 a->len_information_elements);
156 if (!ssidie)
157 return false;
158 if (ssidie[1] != ssid_len)
159 return false;
160 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
161 }
162
163 static bool is_mesh(struct cfg80211_bss *a,
164 const u8 *meshid, size_t meshidlen,
165 const u8 *meshcfg)
166 {
167 const u8 *ie;
168
169 if (!is_zero_ether_addr(a->bssid))
170 return false;
171
172 ie = find_ie(WLAN_EID_MESH_ID,
173 a->information_elements,
174 a->len_information_elements);
175 if (!ie)
176 return false;
177 if (ie[1] != meshidlen)
178 return false;
179 if (memcmp(ie + 2, meshid, meshidlen))
180 return false;
181
182 ie = find_ie(WLAN_EID_MESH_CONFIG,
183 a->information_elements,
184 a->len_information_elements);
185 if (ie[1] != IEEE80211_MESH_CONFIG_LEN)
186 return false;
187
188 /*
189 * Ignore mesh capability (last two bytes of the IE) when
190 * comparing since that may differ between stations taking
191 * part in the same mesh.
192 */
193 return memcmp(ie + 2, meshcfg, IEEE80211_MESH_CONFIG_LEN - 2) == 0;
194 }
195
196 static int cmp_bss(struct cfg80211_bss *a,
197 struct cfg80211_bss *b)
198 {
199 int r;
200
201 if (a->channel != b->channel)
202 return b->channel->center_freq - a->channel->center_freq;
203
204 r = memcmp(a->bssid, b->bssid, ETH_ALEN);
205 if (r)
206 return r;
207
208 if (is_zero_ether_addr(a->bssid)) {
209 r = cmp_ies(WLAN_EID_MESH_ID,
210 a->information_elements,
211 a->len_information_elements,
212 b->information_elements,
213 b->len_information_elements);
214 if (r)
215 return r;
216 return cmp_ies(WLAN_EID_MESH_CONFIG,
217 a->information_elements,
218 a->len_information_elements,
219 b->information_elements,
220 b->len_information_elements);
221 }
222
223 return cmp_ies(WLAN_EID_SSID,
224 a->information_elements,
225 a->len_information_elements,
226 b->information_elements,
227 b->len_information_elements);
228 }
229
230 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
231 struct ieee80211_channel *channel,
232 const u8 *bssid,
233 const u8 *ssid, size_t ssid_len,
234 u16 capa_mask, u16 capa_val)
235 {
236 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
237 struct cfg80211_internal_bss *bss, *res = NULL;
238
239 spin_lock_bh(&dev->bss_lock);
240
241 list_for_each_entry(bss, &dev->bss_list, list) {
242 if ((bss->pub.capability & capa_mask) != capa_val)
243 continue;
244 if (channel && bss->pub.channel != channel)
245 continue;
246 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
247 res = bss;
248 kref_get(&res->ref);
249 break;
250 }
251 }
252
253 spin_unlock_bh(&dev->bss_lock);
254 if (!res)
255 return NULL;
256 return &res->pub;
257 }
258 EXPORT_SYMBOL(cfg80211_get_bss);
259
260 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
261 struct ieee80211_channel *channel,
262 const u8 *meshid, size_t meshidlen,
263 const u8 *meshcfg)
264 {
265 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
266 struct cfg80211_internal_bss *bss, *res = NULL;
267
268 spin_lock_bh(&dev->bss_lock);
269
270 list_for_each_entry(bss, &dev->bss_list, list) {
271 if (channel && bss->pub.channel != channel)
272 continue;
273 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
274 res = bss;
275 kref_get(&res->ref);
276 break;
277 }
278 }
279
280 spin_unlock_bh(&dev->bss_lock);
281 if (!res)
282 return NULL;
283 return &res->pub;
284 }
285 EXPORT_SYMBOL(cfg80211_get_mesh);
286
287
288 static void rb_insert_bss(struct cfg80211_registered_device *dev,
289 struct cfg80211_internal_bss *bss)
290 {
291 struct rb_node **p = &dev->bss_tree.rb_node;
292 struct rb_node *parent = NULL;
293 struct cfg80211_internal_bss *tbss;
294 int cmp;
295
296 while (*p) {
297 parent = *p;
298 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
299
300 cmp = cmp_bss(&bss->pub, &tbss->pub);
301
302 if (WARN_ON(!cmp)) {
303 /* will sort of leak this BSS */
304 return;
305 }
306
307 if (cmp < 0)
308 p = &(*p)->rb_left;
309 else
310 p = &(*p)->rb_right;
311 }
312
313 rb_link_node(&bss->rbn, parent, p);
314 rb_insert_color(&bss->rbn, &dev->bss_tree);
315 }
316
317 static struct cfg80211_internal_bss *
318 rb_find_bss(struct cfg80211_registered_device *dev,
319 struct cfg80211_internal_bss *res)
320 {
321 struct rb_node *n = dev->bss_tree.rb_node;
322 struct cfg80211_internal_bss *bss;
323 int r;
324
325 while (n) {
326 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
327 r = cmp_bss(&res->pub, &bss->pub);
328
329 if (r == 0)
330 return bss;
331 else if (r < 0)
332 n = n->rb_left;
333 else
334 n = n->rb_right;
335 }
336
337 return NULL;
338 }
339
340 static struct cfg80211_internal_bss *
341 cfg80211_bss_update(struct cfg80211_registered_device *dev,
342 struct cfg80211_internal_bss *res,
343 bool overwrite)
344 {
345 struct cfg80211_internal_bss *found = NULL;
346 const u8 *meshid, *meshcfg;
347
348 /*
349 * The reference to "res" is donated to this function.
350 */
351
352 if (WARN_ON(!res->pub.channel)) {
353 kref_put(&res->ref, bss_release);
354 return NULL;
355 }
356
357 res->ts = jiffies;
358
359 if (is_zero_ether_addr(res->pub.bssid)) {
360 /* must be mesh, verify */
361 meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements,
362 res->pub.len_information_elements);
363 meshcfg = find_ie(WLAN_EID_MESH_CONFIG,
364 res->pub.information_elements,
365 res->pub.len_information_elements);
366 if (!meshid || !meshcfg ||
367 meshcfg[1] != IEEE80211_MESH_CONFIG_LEN) {
368 /* bogus mesh */
369 kref_put(&res->ref, bss_release);
370 return NULL;
371 }
372 }
373
374 spin_lock_bh(&dev->bss_lock);
375
376 found = rb_find_bss(dev, res);
377
378 if (found) {
379 found->pub.beacon_interval = res->pub.beacon_interval;
380 found->pub.tsf = res->pub.tsf;
381 found->pub.signal = res->pub.signal;
382 found->pub.capability = res->pub.capability;
383 found->ts = res->ts;
384
385 /* overwrite IEs */
386 if (overwrite) {
387 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
388 size_t ielen = res->pub.len_information_elements;
389
390 if (!found->ies_allocated && ksize(found) >= used + ielen) {
391 memcpy(found->pub.information_elements,
392 res->pub.information_elements, ielen);
393 found->pub.len_information_elements = ielen;
394 } else {
395 u8 *ies = found->pub.information_elements;
396
397 if (found->ies_allocated)
398 ies = krealloc(ies, ielen, GFP_ATOMIC);
399 else
400 ies = kmalloc(ielen, GFP_ATOMIC);
401
402 if (ies) {
403 memcpy(ies, res->pub.information_elements, ielen);
404 found->ies_allocated = true;
405 found->pub.information_elements = ies;
406 found->pub.len_information_elements = ielen;
407 }
408 }
409 }
410
411 kref_put(&res->ref, bss_release);
412 } else {
413 /* this "consumes" the reference */
414 list_add_tail(&res->list, &dev->bss_list);
415 rb_insert_bss(dev, res);
416 found = res;
417 }
418
419 dev->bss_generation++;
420 spin_unlock_bh(&dev->bss_lock);
421
422 kref_get(&found->ref);
423 return found;
424 }
425
426 struct cfg80211_bss*
427 cfg80211_inform_bss(struct wiphy *wiphy,
428 struct ieee80211_channel *channel,
429 const u8 *bssid,
430 u64 timestamp, u16 capability, u16 beacon_interval,
431 const u8 *ie, size_t ielen,
432 s32 signal, gfp_t gfp)
433 {
434 struct cfg80211_internal_bss *res;
435 size_t privsz;
436
437 if (WARN_ON(!wiphy))
438 return NULL;
439
440 privsz = wiphy->bss_priv_size;
441
442 if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC &&
443 (signal < 0 || signal > 100)))
444 return NULL;
445
446 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
447 if (!res)
448 return NULL;
449
450 memcpy(res->pub.bssid, bssid, ETH_ALEN);
451 res->pub.channel = channel;
452 res->pub.signal = signal;
453 res->pub.tsf = timestamp;
454 res->pub.beacon_interval = beacon_interval;
455 res->pub.capability = capability;
456 /* point to after the private area */
457 res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz;
458 memcpy(res->pub.information_elements, ie, ielen);
459 res->pub.len_information_elements = ielen;
460
461 kref_init(&res->ref);
462
463 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, 0);
464 if (!res)
465 return NULL;
466
467 if (res->pub.capability & WLAN_CAPABILITY_ESS)
468 regulatory_hint_found_beacon(wiphy, channel, gfp);
469
470 /* cfg80211_bss_update gives us a referenced result */
471 return &res->pub;
472 }
473 EXPORT_SYMBOL(cfg80211_inform_bss);
474
475 struct cfg80211_bss *
476 cfg80211_inform_bss_frame(struct wiphy *wiphy,
477 struct ieee80211_channel *channel,
478 struct ieee80211_mgmt *mgmt, size_t len,
479 s32 signal, gfp_t gfp)
480 {
481 struct cfg80211_internal_bss *res;
482 size_t ielen = len - offsetof(struct ieee80211_mgmt,
483 u.probe_resp.variable);
484 bool overwrite;
485 size_t privsz = wiphy->bss_priv_size;
486
487 if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC &&
488 (signal < 0 || signal > 100)))
489 return NULL;
490
491 if (WARN_ON(!mgmt || !wiphy ||
492 len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
493 return NULL;
494
495 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
496 if (!res)
497 return NULL;
498
499 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
500 res->pub.channel = channel;
501 res->pub.signal = signal;
502 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
503 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
504 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
505 /* point to after the private area */
506 res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz;
507 memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen);
508 res->pub.len_information_elements = ielen;
509
510 kref_init(&res->ref);
511
512 overwrite = ieee80211_is_probe_resp(mgmt->frame_control);
513
514 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite);
515 if (!res)
516 return NULL;
517
518 if (res->pub.capability & WLAN_CAPABILITY_ESS)
519 regulatory_hint_found_beacon(wiphy, channel, gfp);
520
521 /* cfg80211_bss_update gives us a referenced result */
522 return &res->pub;
523 }
524 EXPORT_SYMBOL(cfg80211_inform_bss_frame);
525
526 void cfg80211_put_bss(struct cfg80211_bss *pub)
527 {
528 struct cfg80211_internal_bss *bss;
529
530 if (!pub)
531 return;
532
533 bss = container_of(pub, struct cfg80211_internal_bss, pub);
534 kref_put(&bss->ref, bss_release);
535 }
536 EXPORT_SYMBOL(cfg80211_put_bss);
537
538 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
539 {
540 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
541 struct cfg80211_internal_bss *bss;
542
543 if (WARN_ON(!pub))
544 return;
545
546 bss = container_of(pub, struct cfg80211_internal_bss, pub);
547
548 spin_lock_bh(&dev->bss_lock);
549
550 list_del(&bss->list);
551 rb_erase(&bss->rbn, &dev->bss_tree);
552
553 spin_unlock_bh(&dev->bss_lock);
554
555 kref_put(&bss->ref, bss_release);
556 }
557 EXPORT_SYMBOL(cfg80211_unlink_bss);
558
559 #ifdef CONFIG_WIRELESS_EXT
560 int cfg80211_wext_siwscan(struct net_device *dev,
561 struct iw_request_info *info,
562 union iwreq_data *wrqu, char *extra)
563 {
564 struct cfg80211_registered_device *rdev;
565 struct wiphy *wiphy;
566 struct iw_scan_req *wreq = NULL;
567 struct cfg80211_scan_request *creq;
568 int i, err, n_channels = 0;
569 enum ieee80211_band band;
570
571 if (!netif_running(dev))
572 return -ENETDOWN;
573
574 rdev = cfg80211_get_dev_from_ifindex(dev->ifindex);
575
576 if (IS_ERR(rdev))
577 return PTR_ERR(rdev);
578
579 if (rdev->scan_req) {
580 err = -EBUSY;
581 goto out;
582 }
583
584 wiphy = &rdev->wiphy;
585
586 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
587 if (wiphy->bands[band])
588 n_channels += wiphy->bands[band]->n_channels;
589
590 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
591 n_channels * sizeof(void *),
592 GFP_ATOMIC);
593 if (!creq) {
594 err = -ENOMEM;
595 goto out;
596 }
597
598 creq->wiphy = wiphy;
599 creq->ifidx = dev->ifindex;
600 creq->ssids = (void *)(creq + 1);
601 creq->channels = (void *)(creq->ssids + 1);
602 creq->n_channels = n_channels;
603 creq->n_ssids = 1;
604
605 /* all channels */
606 i = 0;
607 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
608 int j;
609 if (!wiphy->bands[band])
610 continue;
611 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
612 creq->channels[i] = &wiphy->bands[band]->channels[j];
613 i++;
614 }
615 }
616
617 /* translate scan request */
618 if (wrqu->data.length == sizeof(struct iw_scan_req)) {
619 wreq = (struct iw_scan_req *)extra;
620
621 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
622 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN)
623 return -EINVAL;
624 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
625 creq->ssids[0].ssid_len = wreq->essid_len;
626 }
627 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
628 creq->n_ssids = 0;
629 }
630
631 rdev->scan_req = creq;
632 err = rdev->ops->scan(wiphy, dev, creq);
633 if (err) {
634 rdev->scan_req = NULL;
635 kfree(creq);
636 } else
637 nl80211_send_scan_start(rdev, dev);
638 out:
639 cfg80211_put_dev(rdev);
640 return err;
641 }
642 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
643
644 static void ieee80211_scan_add_ies(struct iw_request_info *info,
645 struct cfg80211_bss *bss,
646 char **current_ev, char *end_buf)
647 {
648 u8 *pos, *end, *next;
649 struct iw_event iwe;
650
651 if (!bss->information_elements ||
652 !bss->len_information_elements)
653 return;
654
655 /*
656 * If needed, fragment the IEs buffer (at IE boundaries) into short
657 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
658 */
659 pos = bss->information_elements;
660 end = pos + bss->len_information_elements;
661
662 while (end - pos > IW_GENERIC_IE_MAX) {
663 next = pos + 2 + pos[1];
664 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
665 next = next + 2 + next[1];
666
667 memset(&iwe, 0, sizeof(iwe));
668 iwe.cmd = IWEVGENIE;
669 iwe.u.data.length = next - pos;
670 *current_ev = iwe_stream_add_point(info, *current_ev,
671 end_buf, &iwe, pos);
672
673 pos = next;
674 }
675
676 if (end > pos) {
677 memset(&iwe, 0, sizeof(iwe));
678 iwe.cmd = IWEVGENIE;
679 iwe.u.data.length = end - pos;
680 *current_ev = iwe_stream_add_point(info, *current_ev,
681 end_buf, &iwe, pos);
682 }
683 }
684
685 static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
686 {
687 unsigned long end = jiffies;
688
689 if (end >= start)
690 return jiffies_to_msecs(end - start);
691
692 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
693 }
694
695 static char *
696 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
697 struct cfg80211_internal_bss *bss, char *current_ev,
698 char *end_buf)
699 {
700 struct iw_event iwe;
701 u8 *buf, *cfg, *p;
702 u8 *ie = bss->pub.information_elements;
703 int rem = bss->pub.len_information_elements, i, sig;
704 bool ismesh = false;
705
706 memset(&iwe, 0, sizeof(iwe));
707 iwe.cmd = SIOCGIWAP;
708 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
709 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
710 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
711 IW_EV_ADDR_LEN);
712
713 memset(&iwe, 0, sizeof(iwe));
714 iwe.cmd = SIOCGIWFREQ;
715 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
716 iwe.u.freq.e = 0;
717 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
718 IW_EV_FREQ_LEN);
719
720 memset(&iwe, 0, sizeof(iwe));
721 iwe.cmd = SIOCGIWFREQ;
722 iwe.u.freq.m = bss->pub.channel->center_freq;
723 iwe.u.freq.e = 6;
724 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
725 IW_EV_FREQ_LEN);
726
727 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
728 memset(&iwe, 0, sizeof(iwe));
729 iwe.cmd = IWEVQUAL;
730 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
731 IW_QUAL_NOISE_INVALID |
732 IW_QUAL_QUAL_UPDATED;
733 switch (wiphy->signal_type) {
734 case CFG80211_SIGNAL_TYPE_MBM:
735 sig = bss->pub.signal / 100;
736 iwe.u.qual.level = sig;
737 iwe.u.qual.updated |= IW_QUAL_DBM;
738 if (sig < -110) /* rather bad */
739 sig = -110;
740 else if (sig > -40) /* perfect */
741 sig = -40;
742 /* will give a range of 0 .. 70 */
743 iwe.u.qual.qual = sig + 110;
744 break;
745 case CFG80211_SIGNAL_TYPE_UNSPEC:
746 iwe.u.qual.level = bss->pub.signal;
747 /* will give range 0 .. 100 */
748 iwe.u.qual.qual = bss->pub.signal;
749 break;
750 default:
751 /* not reached */
752 break;
753 }
754 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
755 &iwe, IW_EV_QUAL_LEN);
756 }
757
758 memset(&iwe, 0, sizeof(iwe));
759 iwe.cmd = SIOCGIWENCODE;
760 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
761 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
762 else
763 iwe.u.data.flags = IW_ENCODE_DISABLED;
764 iwe.u.data.length = 0;
765 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
766 &iwe, "");
767
768 while (rem >= 2) {
769 /* invalid data */
770 if (ie[1] > rem - 2)
771 break;
772
773 switch (ie[0]) {
774 case WLAN_EID_SSID:
775 memset(&iwe, 0, sizeof(iwe));
776 iwe.cmd = SIOCGIWESSID;
777 iwe.u.data.length = ie[1];
778 iwe.u.data.flags = 1;
779 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
780 &iwe, ie + 2);
781 break;
782 case WLAN_EID_MESH_ID:
783 memset(&iwe, 0, sizeof(iwe));
784 iwe.cmd = SIOCGIWESSID;
785 iwe.u.data.length = ie[1];
786 iwe.u.data.flags = 1;
787 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
788 &iwe, ie + 2);
789 break;
790 case WLAN_EID_MESH_CONFIG:
791 ismesh = true;
792 if (ie[1] != IEEE80211_MESH_CONFIG_LEN)
793 break;
794 buf = kmalloc(50, GFP_ATOMIC);
795 if (!buf)
796 break;
797 cfg = ie + 2;
798 memset(&iwe, 0, sizeof(iwe));
799 iwe.cmd = IWEVCUSTOM;
800 sprintf(buf, "Mesh network (version %d)", cfg[0]);
801 iwe.u.data.length = strlen(buf);
802 current_ev = iwe_stream_add_point(info, current_ev,
803 end_buf,
804 &iwe, buf);
805 sprintf(buf, "Path Selection Protocol ID: "
806 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
807 cfg[4]);
808 iwe.u.data.length = strlen(buf);
809 current_ev = iwe_stream_add_point(info, current_ev,
810 end_buf,
811 &iwe, buf);
812 sprintf(buf, "Path Selection Metric ID: "
813 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
814 cfg[8]);
815 iwe.u.data.length = strlen(buf);
816 current_ev = iwe_stream_add_point(info, current_ev,
817 end_buf,
818 &iwe, buf);
819 sprintf(buf, "Congestion Control Mode ID: "
820 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
821 cfg[11], cfg[12]);
822 iwe.u.data.length = strlen(buf);
823 current_ev = iwe_stream_add_point(info, current_ev,
824 end_buf,
825 &iwe, buf);
826 sprintf(buf, "Channel Precedence: "
827 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
828 cfg[15], cfg[16]);
829 iwe.u.data.length = strlen(buf);
830 current_ev = iwe_stream_add_point(info, current_ev,
831 end_buf,
832 &iwe, buf);
833 kfree(buf);
834 break;
835 case WLAN_EID_SUPP_RATES:
836 case WLAN_EID_EXT_SUPP_RATES:
837 /* display all supported rates in readable format */
838 p = current_ev + iwe_stream_lcp_len(info);
839
840 memset(&iwe, 0, sizeof(iwe));
841 iwe.cmd = SIOCGIWRATE;
842 /* Those two flags are ignored... */
843 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
844
845 for (i = 0; i < ie[1]; i++) {
846 iwe.u.bitrate.value =
847 ((ie[i + 2] & 0x7f) * 500000);
848 p = iwe_stream_add_value(info, current_ev, p,
849 end_buf, &iwe, IW_EV_PARAM_LEN);
850 }
851 current_ev = p;
852 break;
853 }
854 rem -= ie[1] + 2;
855 ie += ie[1] + 2;
856 }
857
858 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
859 || ismesh) {
860 memset(&iwe, 0, sizeof(iwe));
861 iwe.cmd = SIOCGIWMODE;
862 if (ismesh)
863 iwe.u.mode = IW_MODE_MESH;
864 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
865 iwe.u.mode = IW_MODE_MASTER;
866 else
867 iwe.u.mode = IW_MODE_ADHOC;
868 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
869 &iwe, IW_EV_UINT_LEN);
870 }
871
872 buf = kmalloc(30, GFP_ATOMIC);
873 if (buf) {
874 memset(&iwe, 0, sizeof(iwe));
875 iwe.cmd = IWEVCUSTOM;
876 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
877 iwe.u.data.length = strlen(buf);
878 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
879 &iwe, buf);
880 memset(&iwe, 0, sizeof(iwe));
881 iwe.cmd = IWEVCUSTOM;
882 sprintf(buf, " Last beacon: %ums ago",
883 elapsed_jiffies_msecs(bss->ts));
884 iwe.u.data.length = strlen(buf);
885 current_ev = iwe_stream_add_point(info, current_ev,
886 end_buf, &iwe, buf);
887 kfree(buf);
888 }
889
890 ieee80211_scan_add_ies(info, &bss->pub, &current_ev, end_buf);
891
892 return current_ev;
893 }
894
895
896 static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
897 struct iw_request_info *info,
898 char *buf, size_t len)
899 {
900 char *current_ev = buf;
901 char *end_buf = buf + len;
902 struct cfg80211_internal_bss *bss;
903
904 spin_lock_bh(&dev->bss_lock);
905 cfg80211_bss_expire(dev);
906
907 list_for_each_entry(bss, &dev->bss_list, list) {
908 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
909 spin_unlock_bh(&dev->bss_lock);
910 return -E2BIG;
911 }
912 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
913 current_ev, end_buf);
914 }
915 spin_unlock_bh(&dev->bss_lock);
916 return current_ev - buf;
917 }
918
919
920 int cfg80211_wext_giwscan(struct net_device *dev,
921 struct iw_request_info *info,
922 struct iw_point *data, char *extra)
923 {
924 struct cfg80211_registered_device *rdev;
925 int res;
926
927 if (!netif_running(dev))
928 return -ENETDOWN;
929
930 rdev = cfg80211_get_dev_from_ifindex(dev->ifindex);
931
932 if (IS_ERR(rdev))
933 return PTR_ERR(rdev);
934
935 if (rdev->scan_req) {
936 res = -EAGAIN;
937 goto out;
938 }
939
940 res = ieee80211_scan_results(rdev, info, extra, data->length);
941 data->length = 0;
942 if (res >= 0) {
943 data->length = res;
944 res = 0;
945 }
946
947 out:
948 cfg80211_put_dev(rdev);
949 return res;
950 }
951 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);
952 #endif
Linux kernel - Deliverables
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