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rndis_wlan: fix broken logic in add_wep_key()
[linux-block.git] / net / wireless / scan.c
CommitLineData
2a519311
JB		 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"
a9a11622 17#include "wext-compat.h"
2a519311 18
09f97e0f 19#define IEEE80211_SCAN_RESULT_EXPIRE (15 * HZ)
2a519311 20
36e6fea8 21void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev)
2a519311 22{
667503dd 23 struct cfg80211_scan_request *request;
2a519311
JB		 24 struct net_device *dev;
25#ifdef CONFIG_WIRELESS_EXT
26 union iwreq_data wrqu;
27#endif
28
667503dd
JB		 29 request = rdev->scan_req;
30
463d0183 31 dev = request->dev;
2a519311 32
6829c878
JB		 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
667503dd 40 if (request->aborted)
36e6fea8 41 nl80211_send_scan_aborted(rdev, dev);
2a519311 42 else
36e6fea8 43 nl80211_send_scan_done(rdev, dev);
2a519311
JB		 44
45#ifdef CONFIG_WIRELESS_EXT
667503dd 46 if (!request->aborted) {
2a519311
JB		 47 memset(&wrqu, 0, sizeof(wrqu));
48
49 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
50 }
51#endif
52
53 dev_put(dev);
54
36e6fea8 55 rdev->scan_req = NULL;
2a519311
JB		 56 kfree(request);
57}
667503dd 58
36e6fea8
JB		 59void __cfg80211_scan_done(struct work_struct *wk)
60{
61 struct cfg80211_registered_device *rdev;
62
63 rdev = container_of(wk, struct cfg80211_registered_device,
64 scan_done_wk);
65
66 cfg80211_lock_rdev(rdev);
67 ___cfg80211_scan_done(rdev);
68 cfg80211_unlock_rdev(rdev);
69}
70
667503dd
JB		 71void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
72{
667503dd
JB		 73 WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);
74
75 request->aborted = aborted;
76 schedule_work(&wiphy_to_dev(request->wiphy)->scan_done_wk);
667503dd 77}
2a519311
JB		 78EXPORT_SYMBOL(cfg80211_scan_done);
79
80static void bss_release(struct kref *ref)
81{
82 struct cfg80211_internal_bss *bss;
83
84 bss = container_of(ref, struct cfg80211_internal_bss, ref);
78c1c7e1
JB		 85 if (bss->pub.free_priv)
86 bss->pub.free_priv(&bss->pub);
cd1658f5
JB		 87
88 if (bss->ies_allocated)
89 kfree(bss->pub.information_elements);
90
19957bb3
JB		 91 BUG_ON(atomic_read(&bss->hold));
92
2a519311
JB		 93 kfree(bss);
94}
95
cb3a8eec
DW		 96/* must hold dev->bss_lock! */
97void cfg80211_bss_age(struct cfg80211_registered_device *dev,
98 unsigned long age_secs)
99{
100 struct cfg80211_internal_bss *bss;
101 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
102
103 list_for_each_entry(bss, &dev->bss_list, list) {
104 bss->ts -= age_jiffies;
105 }
106}
107
2a519311
JB		 108/* must hold dev->bss_lock! */
109void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
110{
111 struct cfg80211_internal_bss *bss, *tmp;
112 bool expired = false;
113
114 list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
19957bb3
JB		 115 if (atomic_read(&bss->hold))
116 continue;
117 if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE))
2a519311
JB		 118 continue;
119 list_del(&bss->list);
120 rb_erase(&bss->rbn, &dev->bss_tree);
121 kref_put(&bss->ref, bss_release);
122 expired = true;
123 }
124
125 if (expired)
126 dev->bss_generation++;
127}
128
129static u8 *find_ie(u8 num, u8 *ies, size_t len)
130{
131 while (len > 2 && ies[0] != num) {
132 len -= ies[1] + 2;
133 ies += ies[1] + 2;
134 }
135 if (len < 2)
136 return NULL;
137 if (len < 2 + ies[1])
138 return NULL;
139 return ies;
140}
141
142static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
143{
144 const u8 *ie1 = find_ie(num, ies1, len1);
145 const u8 *ie2 = find_ie(num, ies2, len2);
146 int r;
147
148 if (!ie1 && !ie2)
149 return 0;
cd3468ba 150 if (!ie1 || !ie2)
2a519311
JB		 151 return -1;
152
153 r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1]));
154 if (r == 0 && ie1[1] != ie2[1])
155 return ie2[1] - ie1[1];
156 return r;
157}
158
159static bool is_bss(struct cfg80211_bss *a,
160 const u8 *bssid,
161 const u8 *ssid, size_t ssid_len)
162{
163 const u8 *ssidie;
164
79420f09 165 if (bssid && compare_ether_addr(a->bssid, bssid))
2a519311
JB		 166 return false;
167
79420f09
JB		 168 if (!ssid)
169 return true;
170
2a519311
JB		 171 ssidie = find_ie(WLAN_EID_SSID,
172 a->information_elements,
173 a->len_information_elements);
174 if (!ssidie)
175 return false;
176 if (ssidie[1] != ssid_len)
177 return false;
178 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
179}
180
181static bool is_mesh(struct cfg80211_bss *a,
182 const u8 *meshid, size_t meshidlen,
183 const u8 *meshcfg)
184{
185 const u8 *ie;
186
187 if (!is_zero_ether_addr(a->bssid))
188 return false;
189
190 ie = find_ie(WLAN_EID_MESH_ID,
191 a->information_elements,
192 a->len_information_elements);
193 if (!ie)
194 return false;
195 if (ie[1] != meshidlen)
196 return false;
197 if (memcmp(ie + 2, meshid, meshidlen))
198 return false;
199
200 ie = find_ie(WLAN_EID_MESH_CONFIG,
201 a->information_elements,
202 a->len_information_elements);
cd3468ba
JB		 203 if (!ie)
204 return false;
2a519311
JB		 205 if (ie[1] != IEEE80211_MESH_CONFIG_LEN)
206 return false;
207
208 /*
209 * Ignore mesh capability (last two bytes of the IE) when
210 * comparing since that may differ between stations taking
211 * part in the same mesh.
212 */
213 return memcmp(ie + 2, meshcfg, IEEE80211_MESH_CONFIG_LEN - 2) == 0;
214}
215
216static int cmp_bss(struct cfg80211_bss *a,
217 struct cfg80211_bss *b)
218{
219 int r;
220
221 if (a->channel != b->channel)
222 return b->channel->center_freq - a->channel->center_freq;
223
224 r = memcmp(a->bssid, b->bssid, ETH_ALEN);
225 if (r)
226 return r;
227
228 if (is_zero_ether_addr(a->bssid)) {
229 r = cmp_ies(WLAN_EID_MESH_ID,
230 a->information_elements,
231 a->len_information_elements,
232 b->information_elements,
233 b->len_information_elements);
234 if (r)
235 return r;
236 return cmp_ies(WLAN_EID_MESH_CONFIG,
237 a->information_elements,
238 a->len_information_elements,
239 b->information_elements,
240 b->len_information_elements);
241 }
242
243 return cmp_ies(WLAN_EID_SSID,
244 a->information_elements,
245 a->len_information_elements,
246 b->information_elements,
247 b->len_information_elements);
248}
249
250struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
251 struct ieee80211_channel *channel,
252 const u8 *bssid,
79420f09
JB		 253 const u8 *ssid, size_t ssid_len,
254 u16 capa_mask, u16 capa_val)
2a519311
JB		 255{
256 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
257 struct cfg80211_internal_bss *bss, *res = NULL;
258
259 spin_lock_bh(&dev->bss_lock);
260
261 list_for_each_entry(bss, &dev->bss_list, list) {
79420f09
JB		 262 if ((bss->pub.capability & capa_mask) != capa_val)
263 continue;
2a519311
JB		 264 if (channel && bss->pub.channel != channel)
265 continue;
266 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
267 res = bss;
268 kref_get(&res->ref);
269 break;
270 }
271 }
272
273 spin_unlock_bh(&dev->bss_lock);
274 if (!res)
275 return NULL;
276 return &res->pub;
277}
278EXPORT_SYMBOL(cfg80211_get_bss);
279
280struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
281 struct ieee80211_channel *channel,
282 const u8 *meshid, size_t meshidlen,
283 const u8 *meshcfg)
284{
285 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
286 struct cfg80211_internal_bss *bss, *res = NULL;
287
288 spin_lock_bh(&dev->bss_lock);
289
290 list_for_each_entry(bss, &dev->bss_list, list) {
291 if (channel && bss->pub.channel != channel)
292 continue;
293 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
294 res = bss;
295 kref_get(&res->ref);
296 break;
297 }
298 }
299
300 spin_unlock_bh(&dev->bss_lock);
301 if (!res)
302 return NULL;
303 return &res->pub;
304}
305EXPORT_SYMBOL(cfg80211_get_mesh);
306
307
308static void rb_insert_bss(struct cfg80211_registered_device *dev,
309 struct cfg80211_internal_bss *bss)
310{
311 struct rb_node **p = &dev->bss_tree.rb_node;
312 struct rb_node *parent = NULL;
313 struct cfg80211_internal_bss *tbss;
314 int cmp;
315
316 while (*p) {
317 parent = *p;
318 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
319
320 cmp = cmp_bss(&bss->pub, &tbss->pub);
321
322 if (WARN_ON(!cmp)) {
323 /* will sort of leak this BSS */
324 return;
325 }
326
327 if (cmp < 0)
328 p = &(*p)->rb_left;
329 else
330 p = &(*p)->rb_right;
331 }
332
333 rb_link_node(&bss->rbn, parent, p);
334 rb_insert_color(&bss->rbn, &dev->bss_tree);
335}
336
337static struct cfg80211_internal_bss *
338rb_find_bss(struct cfg80211_registered_device *dev,
339 struct cfg80211_internal_bss *res)
340{
341 struct rb_node *n = dev->bss_tree.rb_node;
342 struct cfg80211_internal_bss *bss;
343 int r;
344
345 while (n) {
346 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
347 r = cmp_bss(&res->pub, &bss->pub);
348
349 if (r == 0)
350 return bss;
351 else if (r < 0)
352 n = n->rb_left;
353 else
354 n = n->rb_right;
355 }
356
357 return NULL;
358}
359
360static struct cfg80211_internal_bss *
361cfg80211_bss_update(struct cfg80211_registered_device *dev,
362 struct cfg80211_internal_bss *res,
363 bool overwrite)
364{
365 struct cfg80211_internal_bss *found = NULL;
366 const u8 *meshid, *meshcfg;
367
368 /*
369 * The reference to "res" is donated to this function.
370 */
371
372 if (WARN_ON(!res->pub.channel)) {
373 kref_put(&res->ref, bss_release);
374 return NULL;
375 }
376
377 res->ts = jiffies;
378
379 if (is_zero_ether_addr(res->pub.bssid)) {
380 /* must be mesh, verify */
381 meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements,
382 res->pub.len_information_elements);
383 meshcfg = find_ie(WLAN_EID_MESH_CONFIG,
384 res->pub.information_elements,
385 res->pub.len_information_elements);
386 if (!meshid || !meshcfg ||
387 meshcfg[1] != IEEE80211_MESH_CONFIG_LEN) {
388 /* bogus mesh */
389 kref_put(&res->ref, bss_release);
390 return NULL;
391 }
392 }
393
394 spin_lock_bh(&dev->bss_lock);
395
396 found = rb_find_bss(dev, res);
397
cd1658f5 398 if (found) {
2a519311
JB		 399 found->pub.beacon_interval = res->pub.beacon_interval;
400 found->pub.tsf = res->pub.tsf;
401 found->pub.signal = res->pub.signal;
2a519311
JB		 402 found->pub.capability = res->pub.capability;
403 found->ts = res->ts;
cd1658f5
JB		 404
405 /* overwrite IEs */
406 if (overwrite) {
407 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
408 size_t ielen = res->pub.len_information_elements;
409
44e1b98f 410 if (!found->ies_allocated && ksize(found) >= used + ielen) {
cd1658f5
JB		 411 memcpy(found->pub.information_elements,
412 res->pub.information_elements, ielen);
413 found->pub.len_information_elements = ielen;
414 } else {
415 u8 *ies = found->pub.information_elements;
416
273de92c
MB		 417 if (found->ies_allocated)
418 ies = krealloc(ies, ielen, GFP_ATOMIC);
419 else
cd1658f5
JB		 420 ies = kmalloc(ielen, GFP_ATOMIC);
421
422 if (ies) {
423 memcpy(ies, res->pub.information_elements, ielen);
424 found->ies_allocated = true;
425 found->pub.information_elements = ies;
c0f0aac0 426 found->pub.len_information_elements = ielen;
cd1658f5
JB		 427 }
428 }
429 }
430
2a519311
JB		 431 kref_put(&res->ref, bss_release);
432 } else {
433 /* this "consumes" the reference */
434 list_add_tail(&res->list, &dev->bss_list);
435 rb_insert_bss(dev, res);
436 found = res;
437 }
438
439 dev->bss_generation++;
440 spin_unlock_bh(&dev->bss_lock);
441
442 kref_get(&found->ref);
443 return found;
444}
445
06aa7afa
JK		 446struct cfg80211_bss*
447cfg80211_inform_bss(struct wiphy *wiphy,
448 struct ieee80211_channel *channel,
449 const u8 *bssid,
450 u64 timestamp, u16 capability, u16 beacon_interval,
451 const u8 *ie, size_t ielen,
452 s32 signal, gfp_t gfp)
453{
454 struct cfg80211_internal_bss *res;
455 size_t privsz;
456
457 if (WARN_ON(!wiphy))
458 return NULL;
459
460 privsz = wiphy->bss_priv_size;
461
462 if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC &&
463 (signal < 0 || signal > 100)))
464 return NULL;
465
466 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
467 if (!res)
468 return NULL;
469
470 memcpy(res->pub.bssid, bssid, ETH_ALEN);
471 res->pub.channel = channel;
472 res->pub.signal = signal;
473 res->pub.tsf = timestamp;
474 res->pub.beacon_interval = beacon_interval;
475 res->pub.capability = capability;
476 /* point to after the private area */
477 res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz;
478 memcpy(res->pub.information_elements, ie, ielen);
479 res->pub.len_information_elements = ielen;
480
481 kref_init(&res->ref);
482
483 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, 0);
484 if (!res)
485 return NULL;
486
487 if (res->pub.capability & WLAN_CAPABILITY_ESS)
488 regulatory_hint_found_beacon(wiphy, channel, gfp);
489
490 /* cfg80211_bss_update gives us a referenced result */
491 return &res->pub;
492}
493EXPORT_SYMBOL(cfg80211_inform_bss);
494
2a519311
JB		 495struct cfg80211_bss *
496cfg80211_inform_bss_frame(struct wiphy *wiphy,
497 struct ieee80211_channel *channel,
498 struct ieee80211_mgmt *mgmt, size_t len,
77965c97 499 s32 signal, gfp_t gfp)
2a519311
JB		 500{
501 struct cfg80211_internal_bss *res;
502 size_t ielen = len - offsetof(struct ieee80211_mgmt,
503 u.probe_resp.variable);
504 bool overwrite;
505 size_t privsz = wiphy->bss_priv_size;
506
77965c97 507 if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC &&
2a519311
JB		 508 (signal < 0 || signal > 100)))
509 return NULL;
510
511 if (WARN_ON(!mgmt || !wiphy ||
512 len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
513 return NULL;
514
515 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
516 if (!res)
517 return NULL;
518
519 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
520 res->pub.channel = channel;
2a519311
JB		 521 res->pub.signal = signal;
522 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
523 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
524 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
525 /* point to after the private area */
526 res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz;
527 memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen);
528 res->pub.len_information_elements = ielen;
529
530 kref_init(&res->ref);
531
532 overwrite = ieee80211_is_probe_resp(mgmt->frame_control);
533
534 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite);
535 if (!res)
536 return NULL;
537
e38f8a7a
LR		 538 if (res->pub.capability & WLAN_CAPABILITY_ESS)
539 regulatory_hint_found_beacon(wiphy, channel, gfp);
540
2a519311
JB		 541 /* cfg80211_bss_update gives us a referenced result */
542 return &res->pub;
543}
544EXPORT_SYMBOL(cfg80211_inform_bss_frame);
545
546void cfg80211_put_bss(struct cfg80211_bss *pub)
547{
548 struct cfg80211_internal_bss *bss;
549
550 if (!pub)
551 return;
552
553 bss = container_of(pub, struct cfg80211_internal_bss, pub);
554 kref_put(&bss->ref, bss_release);
555}
556EXPORT_SYMBOL(cfg80211_put_bss);
557
d491af19
JB		 558void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
559{
560 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
561 struct cfg80211_internal_bss *bss;
562
563 if (WARN_ON(!pub))
564 return;
565
566 bss = container_of(pub, struct cfg80211_internal_bss, pub);
567
568 spin_lock_bh(&dev->bss_lock);
569
570 list_del(&bss->list);
f5ea9120 571 dev->bss_generation++;
d491af19
JB		 572 rb_erase(&bss->rbn, &dev->bss_tree);
573
574 spin_unlock_bh(&dev->bss_lock);
575
576 kref_put(&bss->ref, bss_release);
577}
578EXPORT_SYMBOL(cfg80211_unlink_bss);
579
2a519311
JB		 580#ifdef CONFIG_WIRELESS_EXT
581int cfg80211_wext_siwscan(struct net_device *dev,
582 struct iw_request_info *info,
583 union iwreq_data *wrqu, char *extra)
584{
585 struct cfg80211_registered_device *rdev;
586 struct wiphy *wiphy;
587 struct iw_scan_req *wreq = NULL;
588 struct cfg80211_scan_request *creq;
589 int i, err, n_channels = 0;
590 enum ieee80211_band band;
591
592 if (!netif_running(dev))
593 return -ENETDOWN;
594
463d0183 595 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2a519311
JB		 596
597 if (IS_ERR(rdev))
598 return PTR_ERR(rdev);
599
600 if (rdev->scan_req) {
601 err = -EBUSY;
602 goto out;
603 }
604
605 wiphy = &rdev->wiphy;
606
607 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
608 if (wiphy->bands[band])
609 n_channels += wiphy->bands[band]->n_channels;
610
611 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
612 n_channels * sizeof(void *),
613 GFP_ATOMIC);
614 if (!creq) {
615 err = -ENOMEM;
616 goto out;
617 }
618
619 creq->wiphy = wiphy;
463d0183 620 creq->dev = dev;
5ba63533
JB		 621 /* SSIDs come after channels */
622 creq->ssids = (void *)&creq->channels[n_channels];
2a519311
JB		 623 creq->n_channels = n_channels;
624 creq->n_ssids = 1;
625
626 /* all channels */
627 i = 0;
628 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
629 int j;
630 if (!wiphy->bands[band])
631 continue;
632 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
633 creq->channels[i] = &wiphy->bands[band]->channels[j];
634 i++;
635 }
636 }
637
638 /* translate scan request */
639 if (wrqu->data.length == sizeof(struct iw_scan_req)) {
640 wreq = (struct iw_scan_req *)extra;
641
642 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
643 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN)
644 return -EINVAL;
645 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
646 creq->ssids[0].ssid_len = wreq->essid_len;
647 }
648 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
649 creq->n_ssids = 0;
650 }
651
652 rdev->scan_req = creq;
653 err = rdev->ops->scan(wiphy, dev, creq);
654 if (err) {
655 rdev->scan_req = NULL;
656 kfree(creq);
463d0183 657 } else {
a538e2d5 658 nl80211_send_scan_start(rdev, dev);
463d0183
JB		 659 dev_hold(dev);
660 }
2a519311 661 out:
4d0c8aea 662 cfg80211_unlock_rdev(rdev);
2a519311
JB		 663 return err;
664}
ba44cb72 665EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
2a519311
JB		 666
667static void ieee80211_scan_add_ies(struct iw_request_info *info,
668 struct cfg80211_bss *bss,
669 char **current_ev, char *end_buf)
670{
671 u8 *pos, *end, *next;
672 struct iw_event iwe;
673
674 if (!bss->information_elements ||
675 !bss->len_information_elements)
676 return;
677
678 /*
679 * If needed, fragment the IEs buffer (at IE boundaries) into short
680 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
681 */
682 pos = bss->information_elements;
683 end = pos + bss->len_information_elements;
684
685 while (end - pos > IW_GENERIC_IE_MAX) {
686 next = pos + 2 + pos[1];
687 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
688 next = next + 2 + next[1];
689
690 memset(&iwe, 0, sizeof(iwe));
691 iwe.cmd = IWEVGENIE;
692 iwe.u.data.length = next - pos;
693 *current_ev = iwe_stream_add_point(info, *current_ev,
694 end_buf, &iwe, pos);
695
696 pos = next;
697 }
698
699 if (end > pos) {
700 memset(&iwe, 0, sizeof(iwe));
701 iwe.cmd = IWEVGENIE;
702 iwe.u.data.length = end - pos;
703 *current_ev = iwe_stream_add_point(info, *current_ev,
704 end_buf, &iwe, pos);
705 }
706}
707
cb3a8eec
DW		 708static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
709{
710 unsigned long end = jiffies;
711
712 if (end >= start)
713 return jiffies_to_msecs(end - start);
714
715 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
716}
2a519311
JB		 717
718static char *
77965c97
JB		 719ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
720 struct cfg80211_internal_bss *bss, char *current_ev,
721 char *end_buf)
2a519311
JB		 722{
723 struct iw_event iwe;
724 u8 *buf, *cfg, *p;
725 u8 *ie = bss->pub.information_elements;
a77b8552 726 int rem = bss->pub.len_information_elements, i, sig;
2a519311
JB		 727 bool ismesh = false;
728
729 memset(&iwe, 0, sizeof(iwe));
730 iwe.cmd = SIOCGIWAP;
731 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
732 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
733 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
734 IW_EV_ADDR_LEN);
735
736 memset(&iwe, 0, sizeof(iwe));
737 iwe.cmd = SIOCGIWFREQ;
738 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
739 iwe.u.freq.e = 0;
740 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
741 IW_EV_FREQ_LEN);
742
743 memset(&iwe, 0, sizeof(iwe));
744 iwe.cmd = SIOCGIWFREQ;
745 iwe.u.freq.m = bss->pub.channel->center_freq;
746 iwe.u.freq.e = 6;
747 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
748 IW_EV_FREQ_LEN);
749
77965c97 750 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
2a519311
JB		 751 memset(&iwe, 0, sizeof(iwe));
752 iwe.cmd = IWEVQUAL;
753 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
754 IW_QUAL_NOISE_INVALID |
a77b8552 755 IW_QUAL_QUAL_UPDATED;
77965c97 756 switch (wiphy->signal_type) {
2a519311 757 case CFG80211_SIGNAL_TYPE_MBM:
a77b8552
JB		 758 sig = bss->pub.signal / 100;
759 iwe.u.qual.level = sig;
2a519311 760 iwe.u.qual.updated |= IW_QUAL_DBM;
a77b8552
JB		 761 if (sig < -110) /* rather bad */
762 sig = -110;
763 else if (sig > -40) /* perfect */
764 sig = -40;
765 /* will give a range of 0 .. 70 */
766 iwe.u.qual.qual = sig + 110;
2a519311
JB		 767 break;
768 case CFG80211_SIGNAL_TYPE_UNSPEC:
769 iwe.u.qual.level = bss->pub.signal;
a77b8552
JB		 770 /* will give range 0 .. 100 */
771 iwe.u.qual.qual = bss->pub.signal;
2a519311
JB		 772 break;
773 default:
774 /* not reached */
775 break;
776 }
777 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
778 &iwe, IW_EV_QUAL_LEN);
779 }
780
781 memset(&iwe, 0, sizeof(iwe));
782 iwe.cmd = SIOCGIWENCODE;
783 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
784 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
785 else
786 iwe.u.data.flags = IW_ENCODE_DISABLED;
787 iwe.u.data.length = 0;
788 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
789 &iwe, "");
790
791 while (rem >= 2) {
792 /* invalid data */
793 if (ie[1] > rem - 2)
794 break;
795
796 switch (ie[0]) {
797 case WLAN_EID_SSID:
798 memset(&iwe, 0, sizeof(iwe));
799 iwe.cmd = SIOCGIWESSID;
800 iwe.u.data.length = ie[1];
801 iwe.u.data.flags = 1;
802 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
803 &iwe, ie + 2);
804 break;
805 case WLAN_EID_MESH_ID:
806 memset(&iwe, 0, sizeof(iwe));
807 iwe.cmd = SIOCGIWESSID;
808 iwe.u.data.length = ie[1];
809 iwe.u.data.flags = 1;
810 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
811 &iwe, ie + 2);
812 break;
813 case WLAN_EID_MESH_CONFIG:
814 ismesh = true;
815 if (ie[1] != IEEE80211_MESH_CONFIG_LEN)
816 break;
817 buf = kmalloc(50, GFP_ATOMIC);
818 if (!buf)
819 break;
820 cfg = ie + 2;
821 memset(&iwe, 0, sizeof(iwe));
822 iwe.cmd = IWEVCUSTOM;
823 sprintf(buf, "Mesh network (version %d)", cfg[0]);
824 iwe.u.data.length = strlen(buf);
825 current_ev = iwe_stream_add_point(info, current_ev,
826 end_buf,
827 &iwe, buf);
828 sprintf(buf, "Path Selection Protocol ID: "
829 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
830 cfg[4]);
831 iwe.u.data.length = strlen(buf);
832 current_ev = iwe_stream_add_point(info, current_ev,
833 end_buf,
834 &iwe, buf);
835 sprintf(buf, "Path Selection Metric ID: "
836 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
837 cfg[8]);
838 iwe.u.data.length = strlen(buf);
839 current_ev = iwe_stream_add_point(info, current_ev,
840 end_buf,
841 &iwe, buf);
842 sprintf(buf, "Congestion Control Mode ID: "
843 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
844 cfg[11], cfg[12]);
845 iwe.u.data.length = strlen(buf);
846 current_ev = iwe_stream_add_point(info, current_ev,
847 end_buf,
848 &iwe, buf);
849 sprintf(buf, "Channel Precedence: "
850 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
851 cfg[15], cfg[16]);
852 iwe.u.data.length = strlen(buf);
853 current_ev = iwe_stream_add_point(info, current_ev,
854 end_buf,
855 &iwe, buf);
856 kfree(buf);
857 break;
858 case WLAN_EID_SUPP_RATES:
859 case WLAN_EID_EXT_SUPP_RATES:
860 /* display all supported rates in readable format */
861 p = current_ev + iwe_stream_lcp_len(info);
862
863 memset(&iwe, 0, sizeof(iwe));
864 iwe.cmd = SIOCGIWRATE;
865 /* Those two flags are ignored... */
866 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
867
868 for (i = 0; i < ie[1]; i++) {
869 iwe.u.bitrate.value =
870 ((ie[i + 2] & 0x7f) * 500000);
871 p = iwe_stream_add_value(info, current_ev, p,
872 end_buf, &iwe, IW_EV_PARAM_LEN);
873 }
874 current_ev = p;
875 break;
876 }
877 rem -= ie[1] + 2;
878 ie += ie[1] + 2;
879 }
880
881 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
882 || ismesh) {
883 memset(&iwe, 0, sizeof(iwe));
884 iwe.cmd = SIOCGIWMODE;
885 if (ismesh)
886 iwe.u.mode = IW_MODE_MESH;
887 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
888 iwe.u.mode = IW_MODE_MASTER;
889 else
890 iwe.u.mode = IW_MODE_ADHOC;
891 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
892 &iwe, IW_EV_UINT_LEN);
893 }
894
895 buf = kmalloc(30, GFP_ATOMIC);
896 if (buf) {
897 memset(&iwe, 0, sizeof(iwe));
898 iwe.cmd = IWEVCUSTOM;
899 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
900 iwe.u.data.length = strlen(buf);
901 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
902 &iwe, buf);
903 memset(&iwe, 0, sizeof(iwe));
904 iwe.cmd = IWEVCUSTOM;
cb3a8eec
DW		 905 sprintf(buf, " Last beacon: %ums ago",
906 elapsed_jiffies_msecs(bss->ts));
2a519311
JB		 907 iwe.u.data.length = strlen(buf);
908 current_ev = iwe_stream_add_point(info, current_ev,
909 end_buf, &iwe, buf);
910 kfree(buf);
911 }
912
913 ieee80211_scan_add_ies(info, &bss->pub, &current_ev, end_buf);
914
915 return current_ev;
916}
917
918
919static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
920 struct iw_request_info *info,
921 char *buf, size_t len)
922{
923 char *current_ev = buf;
924 char *end_buf = buf + len;
925 struct cfg80211_internal_bss *bss;
926
927 spin_lock_bh(&dev->bss_lock);
928 cfg80211_bss_expire(dev);
929
930 list_for_each_entry(bss, &dev->bss_list, list) {
931 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
932 spin_unlock_bh(&dev->bss_lock);
933 return -E2BIG;
934 }
77965c97
JB		 935 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
936 current_ev, end_buf);
2a519311
JB		 937 }
938 spin_unlock_bh(&dev->bss_lock);
939 return current_ev - buf;
940}
941
942
943int cfg80211_wext_giwscan(struct net_device *dev,
944 struct iw_request_info *info,
945 struct iw_point *data, char *extra)
946{
947 struct cfg80211_registered_device *rdev;
948 int res;
949
950 if (!netif_running(dev))
951 return -ENETDOWN;
952
463d0183 953 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2a519311
JB		 954
955 if (IS_ERR(rdev))
956 return PTR_ERR(rdev);
957
958 if (rdev->scan_req) {
959 res = -EAGAIN;
960 goto out;
961 }
962
963 res = ieee80211_scan_results(rdev, info, extra, data->length);
964 data->length = 0;
965 if (res >= 0) {
966 data->length = res;
967 res = 0;
968 }
969
970 out:
4d0c8aea 971 cfg80211_unlock_rdev(rdev);
2a519311
JB		 972 return res;
973}
ba44cb72 974EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);
2a519311 975#endif
Linux 6.x block layer and io_uring tree(s)