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mac80211: cooperate more with network namespaces
[mirror_ubuntu-bionic-kernel.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"
17
18#define IEEE80211_SCAN_RESULT_EXPIRE (10 * HZ)
19
667503dd 20void __cfg80211_scan_done(struct work_struct *wk)
2a519311 21{
667503dd
JB		 22 struct cfg80211_registered_device *rdev;
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 rdev = container_of(wk, struct cfg80211_registered_device,
30 scan_done_wk);
31
32 mutex_lock(&rdev->mtx);
33 request = rdev->scan_req;
34
2a519311
JB		 35 dev = dev_get_by_index(&init_net, request->ifidx);
36 if (!dev)
37 goto out;
38
6829c878
JB		 39 /*
40 * This must be before sending the other events!
41 * Otherwise, wpa_supplicant gets completely confused with
42 * wext events.
43 */
44 cfg80211_sme_scan_done(dev);
45
667503dd 46 if (request->aborted)
2a519311
JB		 47 nl80211_send_scan_aborted(wiphy_to_dev(request->wiphy), dev);
48 else
49 nl80211_send_scan_done(wiphy_to_dev(request->wiphy), dev);
50
51#ifdef CONFIG_WIRELESS_EXT
667503dd 52 if (!request->aborted) {
2a519311
JB		 53 memset(&wrqu, 0, sizeof(wrqu));
54
55 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
56 }
57#endif
58
59 dev_put(dev);
60
61 out:
667503dd 62 cfg80211_unlock_rdev(rdev);
9e81eccf 63 wiphy_to_dev(request->wiphy)->scan_req = NULL;
2a519311
JB		 64 kfree(request);
65}
667503dd
JB		 66
67void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
68{
69 struct net_device *dev = dev_get_by_index(&init_net, request->ifidx);
70 if (WARN_ON(!dev)) {
71 kfree(request);
72 return;
73 }
74
75 WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);
76
77 request->aborted = aborted;
78 schedule_work(&wiphy_to_dev(request->wiphy)->scan_done_wk);
79 dev_put(dev);
80}
2a519311
JB		 81EXPORT_SYMBOL(cfg80211_scan_done);
82
83static void bss_release(struct kref *ref)
84{
85 struct cfg80211_internal_bss *bss;
86
87 bss = container_of(ref, struct cfg80211_internal_bss, ref);
78c1c7e1
JB		 88 if (bss->pub.free_priv)
89 bss->pub.free_priv(&bss->pub);
cd1658f5
JB		 90
91 if (bss->ies_allocated)
92 kfree(bss->pub.information_elements);
93
19957bb3
JB		 94 BUG_ON(atomic_read(&bss->hold));
95
2a519311
JB		 96 kfree(bss);
97}
98
cb3a8eec
DW		 99/* must hold dev->bss_lock! */
100void cfg80211_bss_age(struct cfg80211_registered_device *dev,
101 unsigned long age_secs)
102{
103 struct cfg80211_internal_bss *bss;
104 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
105
106 list_for_each_entry(bss, &dev->bss_list, list) {
107 bss->ts -= age_jiffies;
108 }
109}
110
2a519311
JB		 111/* must hold dev->bss_lock! */
112void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
113{
114 struct cfg80211_internal_bss *bss, *tmp;
115 bool expired = false;
116
117 list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
19957bb3
JB		 118 if (atomic_read(&bss->hold))
119 continue;
120 if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE))
2a519311
JB		 121 continue;
122 list_del(&bss->list);
123 rb_erase(&bss->rbn, &dev->bss_tree);
124 kref_put(&bss->ref, bss_release);
125 expired = true;
126 }
127
128 if (expired)
129 dev->bss_generation++;
130}
131
132static u8 *find_ie(u8 num, u8 *ies, size_t len)
133{
134 while (len > 2 && ies[0] != num) {
135 len -= ies[1] + 2;
136 ies += ies[1] + 2;
137 }
138 if (len < 2)
139 return NULL;
140 if (len < 2 + ies[1])
141 return NULL;
142 return ies;
143}
144
145static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
146{
147 const u8 *ie1 = find_ie(num, ies1, len1);
148 const u8 *ie2 = find_ie(num, ies2, len2);
149 int r;
150
151 if (!ie1 && !ie2)
152 return 0;
153 if (!ie1)
154 return -1;
155
156 r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1]));
157 if (r == 0 && ie1[1] != ie2[1])
158 return ie2[1] - ie1[1];
159 return r;
160}
161
162static bool is_bss(struct cfg80211_bss *a,
163 const u8 *bssid,
164 const u8 *ssid, size_t ssid_len)
165{
166 const u8 *ssidie;
167
79420f09 168 if (bssid && compare_ether_addr(a->bssid, bssid))
2a519311
JB		 169 return false;
170
79420f09
JB		 171 if (!ssid)
172 return true;
173
2a519311
JB		 174 ssidie = find_ie(WLAN_EID_SSID,
175 a->information_elements,
176 a->len_information_elements);
177 if (!ssidie)
178 return false;
179 if (ssidie[1] != ssid_len)
180 return false;
181 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
182}
183
184static bool is_mesh(struct cfg80211_bss *a,
185 const u8 *meshid, size_t meshidlen,
186 const u8 *meshcfg)
187{
188 const u8 *ie;
189
190 if (!is_zero_ether_addr(a->bssid))
191 return false;
192
193 ie = find_ie(WLAN_EID_MESH_ID,
194 a->information_elements,
195 a->len_information_elements);
196 if (!ie)
197 return false;
198 if (ie[1] != meshidlen)
199 return false;
200 if (memcmp(ie + 2, meshid, meshidlen))
201 return false;
202
203 ie = find_ie(WLAN_EID_MESH_CONFIG,
204 a->information_elements,
205 a->len_information_elements);
206 if (ie[1] != IEEE80211_MESH_CONFIG_LEN)
207 return false;
208
209 /*
210 * Ignore mesh capability (last two bytes of the IE) when
211 * comparing since that may differ between stations taking
212 * part in the same mesh.
213 */
214 return memcmp(ie + 2, meshcfg, IEEE80211_MESH_CONFIG_LEN - 2) == 0;
215}
216
217static int cmp_bss(struct cfg80211_bss *a,
218 struct cfg80211_bss *b)
219{
220 int r;
221
222 if (a->channel != b->channel)
223 return b->channel->center_freq - a->channel->center_freq;
224
225 r = memcmp(a->bssid, b->bssid, ETH_ALEN);
226 if (r)
227 return r;
228
229 if (is_zero_ether_addr(a->bssid)) {
230 r = cmp_ies(WLAN_EID_MESH_ID,
231 a->information_elements,
232 a->len_information_elements,
233 b->information_elements,
234 b->len_information_elements);
235 if (r)
236 return r;
237 return cmp_ies(WLAN_EID_MESH_CONFIG,
238 a->information_elements,
239 a->len_information_elements,
240 b->information_elements,
241 b->len_information_elements);
242 }
243
244 return cmp_ies(WLAN_EID_SSID,
245 a->information_elements,
246 a->len_information_elements,
247 b->information_elements,
248 b->len_information_elements);
249}
250
251struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
252 struct ieee80211_channel *channel,
253 const u8 *bssid,
79420f09
JB		 254 const u8 *ssid, size_t ssid_len,
255 u16 capa_mask, u16 capa_val)
2a519311
JB		 256{
257 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
258 struct cfg80211_internal_bss *bss, *res = NULL;
259
260 spin_lock_bh(&dev->bss_lock);
261
262 list_for_each_entry(bss, &dev->bss_list, list) {
79420f09
JB		 263 if ((bss->pub.capability & capa_mask) != capa_val)
264 continue;
2a519311
JB		 265 if (channel && bss->pub.channel != channel)
266 continue;
267 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
268 res = bss;
269 kref_get(&res->ref);
270 break;
271 }
272 }
273
274 spin_unlock_bh(&dev->bss_lock);
275 if (!res)
276 return NULL;
277 return &res->pub;
278}
279EXPORT_SYMBOL(cfg80211_get_bss);
280
281struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
282 struct ieee80211_channel *channel,
283 const u8 *meshid, size_t meshidlen,
284 const u8 *meshcfg)
285{
286 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
287 struct cfg80211_internal_bss *bss, *res = NULL;
288
289 spin_lock_bh(&dev->bss_lock);
290
291 list_for_each_entry(bss, &dev->bss_list, list) {
292 if (channel && bss->pub.channel != channel)
293 continue;
294 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
295 res = bss;
296 kref_get(&res->ref);
297 break;
298 }
299 }
300
301 spin_unlock_bh(&dev->bss_lock);
302 if (!res)
303 return NULL;
304 return &res->pub;
305}
306EXPORT_SYMBOL(cfg80211_get_mesh);
307
308
309static void rb_insert_bss(struct cfg80211_registered_device *dev,
310 struct cfg80211_internal_bss *bss)
311{
312 struct rb_node **p = &dev->bss_tree.rb_node;
313 struct rb_node *parent = NULL;
314 struct cfg80211_internal_bss *tbss;
315 int cmp;
316
317 while (*p) {
318 parent = *p;
319 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
320
321 cmp = cmp_bss(&bss->pub, &tbss->pub);
322
323 if (WARN_ON(!cmp)) {
324 /* will sort of leak this BSS */
325 return;
326 }
327
328 if (cmp < 0)
329 p = &(*p)->rb_left;
330 else
331 p = &(*p)->rb_right;
332 }
333
334 rb_link_node(&bss->rbn, parent, p);
335 rb_insert_color(&bss->rbn, &dev->bss_tree);
336}
337
338static struct cfg80211_internal_bss *
339rb_find_bss(struct cfg80211_registered_device *dev,
340 struct cfg80211_internal_bss *res)
341{
342 struct rb_node *n = dev->bss_tree.rb_node;
343 struct cfg80211_internal_bss *bss;
344 int r;
345
346 while (n) {
347 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
348 r = cmp_bss(&res->pub, &bss->pub);
349
350 if (r == 0)
351 return bss;
352 else if (r < 0)
353 n = n->rb_left;
354 else
355 n = n->rb_right;
356 }
357
358 return NULL;
359}
360
361static struct cfg80211_internal_bss *
362cfg80211_bss_update(struct cfg80211_registered_device *dev,
363 struct cfg80211_internal_bss *res,
364 bool overwrite)
365{
366 struct cfg80211_internal_bss *found = NULL;
367 const u8 *meshid, *meshcfg;
368
369 /*
370 * The reference to "res" is donated to this function.
371 */
372
373 if (WARN_ON(!res->pub.channel)) {
374 kref_put(&res->ref, bss_release);
375 return NULL;
376 }
377
378 res->ts = jiffies;
379
380 if (is_zero_ether_addr(res->pub.bssid)) {
381 /* must be mesh, verify */
382 meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements,
383 res->pub.len_information_elements);
384 meshcfg = find_ie(WLAN_EID_MESH_CONFIG,
385 res->pub.information_elements,
386 res->pub.len_information_elements);
387 if (!meshid || !meshcfg ||
388 meshcfg[1] != IEEE80211_MESH_CONFIG_LEN) {
389 /* bogus mesh */
390 kref_put(&res->ref, bss_release);
391 return NULL;
392 }
393 }
394
395 spin_lock_bh(&dev->bss_lock);
396
397 found = rb_find_bss(dev, res);
398
cd1658f5 399 if (found) {
2a519311
JB		 400 found->pub.beacon_interval = res->pub.beacon_interval;
401 found->pub.tsf = res->pub.tsf;
402 found->pub.signal = res->pub.signal;
2a519311
JB		 403 found->pub.capability = res->pub.capability;
404 found->ts = res->ts;
cd1658f5
JB		 405
406 /* overwrite IEs */
407 if (overwrite) {
408 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
409 size_t ielen = res->pub.len_information_elements;
410
44e1b98f 411 if (!found->ies_allocated && ksize(found) >= used + ielen) {
cd1658f5
JB		 412 memcpy(found->pub.information_elements,
413 res->pub.information_elements, ielen);
414 found->pub.len_information_elements = ielen;
415 } else {
416 u8 *ies = found->pub.information_elements;
417
273de92c
MB		 418 if (found->ies_allocated)
419 ies = krealloc(ies, ielen, GFP_ATOMIC);
420 else
cd1658f5
JB		 421 ies = kmalloc(ielen, GFP_ATOMIC);
422
423 if (ies) {
424 memcpy(ies, res->pub.information_elements, ielen);
425 found->ies_allocated = true;
426 found->pub.information_elements = ies;
c0f0aac0 427 found->pub.len_information_elements = ielen;
cd1658f5
JB		 428 }
429 }
430 }
431
2a519311
JB		 432 kref_put(&res->ref, bss_release);
433 } else {
434 /* this "consumes" the reference */
435 list_add_tail(&res->list, &dev->bss_list);
436 rb_insert_bss(dev, res);
437 found = res;
438 }
439
440 dev->bss_generation++;
441 spin_unlock_bh(&dev->bss_lock);
442
443 kref_get(&found->ref);
444 return found;
445}
446
06aa7afa
JK		 447struct cfg80211_bss*
448cfg80211_inform_bss(struct wiphy *wiphy,
449 struct ieee80211_channel *channel,
450 const u8 *bssid,
451 u64 timestamp, u16 capability, u16 beacon_interval,
452 const u8 *ie, size_t ielen,
453 s32 signal, gfp_t gfp)
454{
455 struct cfg80211_internal_bss *res;
456 size_t privsz;
457
458 if (WARN_ON(!wiphy))
459 return NULL;
460
461 privsz = wiphy->bss_priv_size;
462
463 if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC &&
464 (signal < 0 || signal > 100)))
465 return NULL;
466
467 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
468 if (!res)
469 return NULL;
470
471 memcpy(res->pub.bssid, bssid, ETH_ALEN);
472 res->pub.channel = channel;
473 res->pub.signal = signal;
474 res->pub.tsf = timestamp;
475 res->pub.beacon_interval = beacon_interval;
476 res->pub.capability = capability;
477 /* point to after the private area */
478 res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz;
479 memcpy(res->pub.information_elements, ie, ielen);
480 res->pub.len_information_elements = ielen;
481
482 kref_init(&res->ref);
483
484 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, 0);
485 if (!res)
486 return NULL;
487
488 if (res->pub.capability & WLAN_CAPABILITY_ESS)
489 regulatory_hint_found_beacon(wiphy, channel, gfp);
490
491 /* cfg80211_bss_update gives us a referenced result */
492 return &res->pub;
493}
494EXPORT_SYMBOL(cfg80211_inform_bss);
495
2a519311
JB		 496struct cfg80211_bss *
497cfg80211_inform_bss_frame(struct wiphy *wiphy,
498 struct ieee80211_channel *channel,
499 struct ieee80211_mgmt *mgmt, size_t len,
77965c97 500 s32 signal, gfp_t gfp)
2a519311
JB		 501{
502 struct cfg80211_internal_bss *res;
503 size_t ielen = len - offsetof(struct ieee80211_mgmt,
504 u.probe_resp.variable);
505 bool overwrite;
506 size_t privsz = wiphy->bss_priv_size;
507
77965c97 508 if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC &&
2a519311
JB		 509 (signal < 0 || signal > 100)))
510 return NULL;
511
512 if (WARN_ON(!mgmt || !wiphy ||
513 len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
514 return NULL;
515
516 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
517 if (!res)
518 return NULL;
519
520 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
521 res->pub.channel = channel;
2a519311
JB		 522 res->pub.signal = signal;
523 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
524 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
525 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
526 /* point to after the private area */
527 res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz;
528 memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen);
529 res->pub.len_information_elements = ielen;
530
531 kref_init(&res->ref);
532
533 overwrite = ieee80211_is_probe_resp(mgmt->frame_control);
534
535 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite);
536 if (!res)
537 return NULL;
538
e38f8a7a
LR		 539 if (res->pub.capability & WLAN_CAPABILITY_ESS)
540 regulatory_hint_found_beacon(wiphy, channel, gfp);
541
2a519311
JB		 542 /* cfg80211_bss_update gives us a referenced result */
543 return &res->pub;
544}
545EXPORT_SYMBOL(cfg80211_inform_bss_frame);
546
547void cfg80211_put_bss(struct cfg80211_bss *pub)
548{
549 struct cfg80211_internal_bss *bss;
550
551 if (!pub)
552 return;
553
554 bss = container_of(pub, struct cfg80211_internal_bss, pub);
555 kref_put(&bss->ref, bss_release);
556}
557EXPORT_SYMBOL(cfg80211_put_bss);
558
d491af19
JB		 559void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
560{
561 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
562 struct cfg80211_internal_bss *bss;
563
564 if (WARN_ON(!pub))
565 return;
566
567 bss = container_of(pub, struct cfg80211_internal_bss, pub);
568
569 spin_lock_bh(&dev->bss_lock);
570
571 list_del(&bss->list);
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
595 rdev = cfg80211_get_dev_from_ifindex(dev->ifindex);
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;
620 creq->ifidx = dev->ifindex;
621 creq->ssids = (void *)(creq + 1);
622 creq->channels = (void *)(creq->ssids + 1);
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);
a538e2d5
JB		 657 } else
658 nl80211_send_scan_start(rdev, dev);
2a519311 659 out:
4d0c8aea 660 cfg80211_unlock_rdev(rdev);
2a519311
JB		 661 return err;
662}
ba44cb72 663EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
2a519311
JB		 664
665static void ieee80211_scan_add_ies(struct iw_request_info *info,
666 struct cfg80211_bss *bss,
667 char **current_ev, char *end_buf)
668{
669 u8 *pos, *end, *next;
670 struct iw_event iwe;
671
672 if (!bss->information_elements ||
673 !bss->len_information_elements)
674 return;
675
676 /*
677 * If needed, fragment the IEs buffer (at IE boundaries) into short
678 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
679 */
680 pos = bss->information_elements;
681 end = pos + bss->len_information_elements;
682
683 while (end - pos > IW_GENERIC_IE_MAX) {
684 next = pos + 2 + pos[1];
685 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
686 next = next + 2 + next[1];
687
688 memset(&iwe, 0, sizeof(iwe));
689 iwe.cmd = IWEVGENIE;
690 iwe.u.data.length = next - pos;
691 *current_ev = iwe_stream_add_point(info, *current_ev,
692 end_buf, &iwe, pos);
693
694 pos = next;
695 }
696
697 if (end > pos) {
698 memset(&iwe, 0, sizeof(iwe));
699 iwe.cmd = IWEVGENIE;
700 iwe.u.data.length = end - pos;
701 *current_ev = iwe_stream_add_point(info, *current_ev,
702 end_buf, &iwe, pos);
703 }
704}
705
cb3a8eec
DW		 706static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
707{
708 unsigned long end = jiffies;
709
710 if (end >= start)
711 return jiffies_to_msecs(end - start);
712
713 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
714}
2a519311
JB		 715
716static char *
77965c97
JB		 717ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
718 struct cfg80211_internal_bss *bss, char *current_ev,
719 char *end_buf)
2a519311
JB		 720{
721 struct iw_event iwe;
722 u8 *buf, *cfg, *p;
723 u8 *ie = bss->pub.information_elements;
a77b8552 724 int rem = bss->pub.len_information_elements, i, sig;
2a519311
JB		 725 bool ismesh = false;
726
727 memset(&iwe, 0, sizeof(iwe));
728 iwe.cmd = SIOCGIWAP;
729 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
730 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
731 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
732 IW_EV_ADDR_LEN);
733
734 memset(&iwe, 0, sizeof(iwe));
735 iwe.cmd = SIOCGIWFREQ;
736 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
737 iwe.u.freq.e = 0;
738 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
739 IW_EV_FREQ_LEN);
740
741 memset(&iwe, 0, sizeof(iwe));
742 iwe.cmd = SIOCGIWFREQ;
743 iwe.u.freq.m = bss->pub.channel->center_freq;
744 iwe.u.freq.e = 6;
745 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
746 IW_EV_FREQ_LEN);
747
77965c97 748 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
2a519311
JB		 749 memset(&iwe, 0, sizeof(iwe));
750 iwe.cmd = IWEVQUAL;
751 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
752 IW_QUAL_NOISE_INVALID |
a77b8552 753 IW_QUAL_QUAL_UPDATED;
77965c97 754 switch (wiphy->signal_type) {
2a519311 755 case CFG80211_SIGNAL_TYPE_MBM:
a77b8552
JB		 756 sig = bss->pub.signal / 100;
757 iwe.u.qual.level = sig;
2a519311 758 iwe.u.qual.updated |= IW_QUAL_DBM;
a77b8552
JB		 759 if (sig < -110) /* rather bad */
760 sig = -110;
761 else if (sig > -40) /* perfect */
762 sig = -40;
763 /* will give a range of 0 .. 70 */
764 iwe.u.qual.qual = sig + 110;
2a519311
JB		 765 break;
766 case CFG80211_SIGNAL_TYPE_UNSPEC:
767 iwe.u.qual.level = bss->pub.signal;
a77b8552
JB		 768 /* will give range 0 .. 100 */
769 iwe.u.qual.qual = bss->pub.signal;
2a519311
JB		 770 break;
771 default:
772 /* not reached */
773 break;
774 }
775 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
776 &iwe, IW_EV_QUAL_LEN);
777 }
778
779 memset(&iwe, 0, sizeof(iwe));
780 iwe.cmd = SIOCGIWENCODE;
781 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
782 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
783 else
784 iwe.u.data.flags = IW_ENCODE_DISABLED;
785 iwe.u.data.length = 0;
786 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
787 &iwe, "");
788
789 while (rem >= 2) {
790 /* invalid data */
791 if (ie[1] > rem - 2)
792 break;
793
794 switch (ie[0]) {
795 case WLAN_EID_SSID:
796 memset(&iwe, 0, sizeof(iwe));
797 iwe.cmd = SIOCGIWESSID;
798 iwe.u.data.length = ie[1];
799 iwe.u.data.flags = 1;
800 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
801 &iwe, ie + 2);
802 break;
803 case WLAN_EID_MESH_ID:
804 memset(&iwe, 0, sizeof(iwe));
805 iwe.cmd = SIOCGIWESSID;
806 iwe.u.data.length = ie[1];
807 iwe.u.data.flags = 1;
808 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
809 &iwe, ie + 2);
810 break;
811 case WLAN_EID_MESH_CONFIG:
812 ismesh = true;
813 if (ie[1] != IEEE80211_MESH_CONFIG_LEN)
814 break;
815 buf = kmalloc(50, GFP_ATOMIC);
816 if (!buf)
817 break;
818 cfg = ie + 2;
819 memset(&iwe, 0, sizeof(iwe));
820 iwe.cmd = IWEVCUSTOM;
821 sprintf(buf, "Mesh network (version %d)", cfg[0]);
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, "Path Selection Protocol ID: "
827 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
828 cfg[4]);
829 iwe.u.data.length = strlen(buf);
830 current_ev = iwe_stream_add_point(info, current_ev,
831 end_buf,
832 &iwe, buf);
833 sprintf(buf, "Path Selection Metric ID: "
834 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
835 cfg[8]);
836 iwe.u.data.length = strlen(buf);
837 current_ev = iwe_stream_add_point(info, current_ev,
838 end_buf,
839 &iwe, buf);
840 sprintf(buf, "Congestion Control Mode ID: "
841 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
842 cfg[11], cfg[12]);
843 iwe.u.data.length = strlen(buf);
844 current_ev = iwe_stream_add_point(info, current_ev,
845 end_buf,
846 &iwe, buf);
847 sprintf(buf, "Channel Precedence: "
848 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
849 cfg[15], cfg[16]);
850 iwe.u.data.length = strlen(buf);
851 current_ev = iwe_stream_add_point(info, current_ev,
852 end_buf,
853 &iwe, buf);
854 kfree(buf);
855 break;
856 case WLAN_EID_SUPP_RATES:
857 case WLAN_EID_EXT_SUPP_RATES:
858 /* display all supported rates in readable format */
859 p = current_ev + iwe_stream_lcp_len(info);
860
861 memset(&iwe, 0, sizeof(iwe));
862 iwe.cmd = SIOCGIWRATE;
863 /* Those two flags are ignored... */
864 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
865
866 for (i = 0; i < ie[1]; i++) {
867 iwe.u.bitrate.value =
868 ((ie[i + 2] & 0x7f) * 500000);
869 p = iwe_stream_add_value(info, current_ev, p,
870 end_buf, &iwe, IW_EV_PARAM_LEN);
871 }
872 current_ev = p;
873 break;
874 }
875 rem -= ie[1] + 2;
876 ie += ie[1] + 2;
877 }
878
879 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
880 || ismesh) {
881 memset(&iwe, 0, sizeof(iwe));
882 iwe.cmd = SIOCGIWMODE;
883 if (ismesh)
884 iwe.u.mode = IW_MODE_MESH;
885 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
886 iwe.u.mode = IW_MODE_MASTER;
887 else
888 iwe.u.mode = IW_MODE_ADHOC;
889 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
890 &iwe, IW_EV_UINT_LEN);
891 }
892
893 buf = kmalloc(30, GFP_ATOMIC);
894 if (buf) {
895 memset(&iwe, 0, sizeof(iwe));
896 iwe.cmd = IWEVCUSTOM;
897 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
898 iwe.u.data.length = strlen(buf);
899 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
900 &iwe, buf);
901 memset(&iwe, 0, sizeof(iwe));
902 iwe.cmd = IWEVCUSTOM;
cb3a8eec
DW		 903 sprintf(buf, " Last beacon: %ums ago",
904 elapsed_jiffies_msecs(bss->ts));
2a519311
JB		 905 iwe.u.data.length = strlen(buf);
906 current_ev = iwe_stream_add_point(info, current_ev,
907 end_buf, &iwe, buf);
908 kfree(buf);
909 }
910
911 ieee80211_scan_add_ies(info, &bss->pub, &current_ev, end_buf);
912
913 return current_ev;
914}
915
916
917static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
918 struct iw_request_info *info,
919 char *buf, size_t len)
920{
921 char *current_ev = buf;
922 char *end_buf = buf + len;
923 struct cfg80211_internal_bss *bss;
924
925 spin_lock_bh(&dev->bss_lock);
926 cfg80211_bss_expire(dev);
927
928 list_for_each_entry(bss, &dev->bss_list, list) {
929 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
930 spin_unlock_bh(&dev->bss_lock);
931 return -E2BIG;
932 }
77965c97
JB		 933 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
934 current_ev, end_buf);
2a519311
JB		 935 }
936 spin_unlock_bh(&dev->bss_lock);
937 return current_ev - buf;
938}
939
940
941int cfg80211_wext_giwscan(struct net_device *dev,
942 struct iw_request_info *info,
943 struct iw_point *data, char *extra)
944{
945 struct cfg80211_registered_device *rdev;
946 int res;
947
948 if (!netif_running(dev))
949 return -ENETDOWN;
950
951 rdev = cfg80211_get_dev_from_ifindex(dev->ifindex);
952
953 if (IS_ERR(rdev))
954 return PTR_ERR(rdev);
955
956 if (rdev->scan_req) {
957 res = -EAGAIN;
958 goto out;
959 }
960
961 res = ieee80211_scan_results(rdev, info, extra, data->length);
962 data->length = 0;
963 if (res >= 0) {
964 data->length = res;
965 res = 0;
966 }
967
968 out:
4d0c8aea 969 cfg80211_unlock_rdev(rdev);
2a519311
JB		 970 return res;
971}
ba44cb72 972EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);
2a519311 973#endif
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