mac80211: remove probe response temporary buffer allocation
[linux-2.6-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>
5a0e3ad6 7#include <linux/slab.h>
2a519311
JB
8#include <linux/module.h>
9#include <linux/netdevice.h>
10#include <linux/wireless.h>
11#include <linux/nl80211.h>
12#include <linux/etherdevice.h>
13#include <net/arp.h>
14#include <net/cfg80211.h>
262eb9b2 15#include <net/cfg80211-wext.h>
2a519311
JB
16#include <net/iw_handler.h>
17#include "core.h"
18#include "nl80211.h"
a9a11622 19#include "wext-compat.h"
e35e4d28 20#include "rdev-ops.h"
2a519311 21
f9616e0f 22#define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ)
2a519311 23
e8e27c66
AK
24static void bss_release(struct kref *ref)
25{
26 struct cfg80211_internal_bss *bss;
27
28 bss = container_of(ref, struct cfg80211_internal_bss, ref);
b629ea3d
JB
29
30 if (WARN_ON(atomic_read(&bss->hold)))
31 return;
32
e8e27c66
AK
33 if (bss->pub.free_priv)
34 bss->pub.free_priv(&bss->pub);
35
36 if (bss->beacon_ies_allocated)
37 kfree(bss->pub.beacon_ies);
38 if (bss->proberesp_ies_allocated)
39 kfree(bss->pub.proberesp_ies);
40
e8e27c66
AK
41 kfree(bss);
42}
43
44/* must hold dev->bss_lock! */
45static void __cfg80211_unlink_bss(struct cfg80211_registered_device *dev,
46 struct cfg80211_internal_bss *bss)
47{
48 list_del_init(&bss->list);
49 rb_erase(&bss->rbn, &dev->bss_tree);
50 kref_put(&bss->ref, bss_release);
51}
52
15d6030b
SL
53/* must hold dev->bss_lock! */
54static void __cfg80211_bss_expire(struct cfg80211_registered_device *dev,
55 unsigned long expire_time)
56{
57 struct cfg80211_internal_bss *bss, *tmp;
58 bool expired = false;
59
60 list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
61 if (atomic_read(&bss->hold))
62 continue;
63 if (!time_after(expire_time, bss->ts))
64 continue;
65
66 __cfg80211_unlink_bss(dev, bss);
67 expired = true;
68 }
69
70 if (expired)
71 dev->bss_generation++;
72}
73
01a0ac41 74void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak)
2a519311 75{
667503dd 76 struct cfg80211_scan_request *request;
fd014284 77 struct wireless_dev *wdev;
3d23e349 78#ifdef CONFIG_CFG80211_WEXT
2a519311
JB
79 union iwreq_data wrqu;
80#endif
81
01a0ac41
JB
82 ASSERT_RDEV_LOCK(rdev);
83
667503dd
JB
84 request = rdev->scan_req;
85
01a0ac41
JB
86 if (!request)
87 return;
88
fd014284 89 wdev = request->wdev;
2a519311 90
6829c878
JB
91 /*
92 * This must be before sending the other events!
93 * Otherwise, wpa_supplicant gets completely confused with
94 * wext events.
95 */
fd014284
JB
96 if (wdev->netdev)
97 cfg80211_sme_scan_done(wdev->netdev);
6829c878 98
15d6030b 99 if (request->aborted) {
fd014284 100 nl80211_send_scan_aborted(rdev, wdev);
15d6030b
SL
101 } else {
102 if (request->flags & NL80211_SCAN_FLAG_FLUSH) {
103 /* flush entries from previous scans */
104 spin_lock_bh(&rdev->bss_lock);
105 __cfg80211_bss_expire(rdev, request->scan_start);
106 spin_unlock_bh(&rdev->bss_lock);
107 }
fd014284 108 nl80211_send_scan_done(rdev, wdev);
15d6030b 109 }
2a519311 110
3d23e349 111#ifdef CONFIG_CFG80211_WEXT
fd014284 112 if (wdev->netdev && !request->aborted) {
2a519311
JB
113 memset(&wrqu, 0, sizeof(wrqu));
114
fd014284 115 wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
2a519311
JB
116 }
117#endif
118
fd014284
JB
119 if (wdev->netdev)
120 dev_put(wdev->netdev);
2a519311 121
36e6fea8 122 rdev->scan_req = NULL;
01a0ac41
JB
123
124 /*
125 * OK. If this is invoked with "leak" then we can't
126 * free this ... but we've cleaned it up anyway. The
127 * driver failed to call the scan_done callback, so
128 * all bets are off, it might still be trying to use
129 * the scan request or not ... if it accesses the dev
130 * in there (it shouldn't anyway) then it may crash.
131 */
132 if (!leak)
133 kfree(request);
2a519311 134}
667503dd 135
36e6fea8
JB
136void __cfg80211_scan_done(struct work_struct *wk)
137{
138 struct cfg80211_registered_device *rdev;
139
140 rdev = container_of(wk, struct cfg80211_registered_device,
141 scan_done_wk);
142
143 cfg80211_lock_rdev(rdev);
01a0ac41 144 ___cfg80211_scan_done(rdev, false);
36e6fea8
JB
145 cfg80211_unlock_rdev(rdev);
146}
147
667503dd
JB
148void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
149{
4ee3e063 150 trace_cfg80211_scan_done(request, aborted);
667503dd
JB
151 WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);
152
153 request->aborted = aborted;
e60d7443 154 queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk);
667503dd 155}
2a519311
JB
156EXPORT_SYMBOL(cfg80211_scan_done);
157
807f8a8c
LC
158void __cfg80211_sched_scan_results(struct work_struct *wk)
159{
160 struct cfg80211_registered_device *rdev;
15d6030b 161 struct cfg80211_sched_scan_request *request;
807f8a8c
LC
162
163 rdev = container_of(wk, struct cfg80211_registered_device,
164 sched_scan_results_wk);
165
15d6030b
SL
166 request = rdev->sched_scan_req;
167
c10841ca 168 mutex_lock(&rdev->sched_scan_mtx);
807f8a8c
LC
169
170 /* we don't have sched_scan_req anymore if the scan is stopping */
15d6030b
SL
171 if (request) {
172 if (request->flags & NL80211_SCAN_FLAG_FLUSH) {
173 /* flush entries from previous scans */
174 spin_lock_bh(&rdev->bss_lock);
175 __cfg80211_bss_expire(rdev, request->scan_start);
176 spin_unlock_bh(&rdev->bss_lock);
177 request->scan_start =
178 jiffies + msecs_to_jiffies(request->interval);
179 }
180 nl80211_send_sched_scan_results(rdev, request->dev);
181 }
807f8a8c 182
c10841ca 183 mutex_unlock(&rdev->sched_scan_mtx);
807f8a8c
LC
184}
185
186void cfg80211_sched_scan_results(struct wiphy *wiphy)
187{
4ee3e063 188 trace_cfg80211_sched_scan_results(wiphy);
807f8a8c
LC
189 /* ignore if we're not scanning */
190 if (wiphy_to_dev(wiphy)->sched_scan_req)
191 queue_work(cfg80211_wq,
192 &wiphy_to_dev(wiphy)->sched_scan_results_wk);
193}
194EXPORT_SYMBOL(cfg80211_sched_scan_results);
195
85a9994a 196void cfg80211_sched_scan_stopped(struct wiphy *wiphy)
807f8a8c 197{
85a9994a 198 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
807f8a8c 199
4ee3e063
BL
200 trace_cfg80211_sched_scan_stopped(wiphy);
201
c10841ca 202 mutex_lock(&rdev->sched_scan_mtx);
807f8a8c 203 __cfg80211_stop_sched_scan(rdev, true);
c10841ca 204 mutex_unlock(&rdev->sched_scan_mtx);
807f8a8c 205}
807f8a8c
LC
206EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
207
208int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
209 bool driver_initiated)
210{
807f8a8c
LC
211 struct net_device *dev;
212
c10841ca 213 lockdep_assert_held(&rdev->sched_scan_mtx);
807f8a8c
LC
214
215 if (!rdev->sched_scan_req)
1a84ff75 216 return -ENOENT;
807f8a8c
LC
217
218 dev = rdev->sched_scan_req->dev;
219
85a9994a 220 if (!driver_initiated) {
e35e4d28 221 int err = rdev_sched_scan_stop(rdev, dev);
85a9994a
LC
222 if (err)
223 return err;
224 }
807f8a8c
LC
225
226 nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED);
227
228 kfree(rdev->sched_scan_req);
229 rdev->sched_scan_req = NULL;
230
3b4670ff 231 return 0;
807f8a8c
LC
232}
233
cb3a8eec
DW
234/* must hold dev->bss_lock! */
235void cfg80211_bss_age(struct cfg80211_registered_device *dev,
236 unsigned long age_secs)
237{
238 struct cfg80211_internal_bss *bss;
239 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
240
915de2ff 241 list_for_each_entry(bss, &dev->bss_list, list)
cb3a8eec 242 bss->ts -= age_jiffies;
cb3a8eec
DW
243}
244
2a519311
JB
245void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
246{
15d6030b 247 __cfg80211_bss_expire(dev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
2a519311
JB
248}
249
c21dbf92 250const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len)
2a519311 251{
c21dbf92 252 while (len > 2 && ies[0] != eid) {
2a519311
JB
253 len -= ies[1] + 2;
254 ies += ies[1] + 2;
255 }
256 if (len < 2)
257 return NULL;
258 if (len < 2 + ies[1])
259 return NULL;
260 return ies;
261}
c21dbf92 262EXPORT_SYMBOL(cfg80211_find_ie);
2a519311 263
0c28ec58
EP
264const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type,
265 const u8 *ies, int len)
266{
267 struct ieee80211_vendor_ie *ie;
268 const u8 *pos = ies, *end = ies + len;
269 int ie_oui;
270
271 while (pos < end) {
272 pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos,
273 end - pos);
274 if (!pos)
275 return NULL;
276
277 if (end - pos < sizeof(*ie))
278 return NULL;
279
280 ie = (struct ieee80211_vendor_ie *)pos;
281 ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2];
282 if (ie_oui == oui && ie->oui_type == oui_type)
283 return pos;
284
285 pos += 2 + ie->len;
286 }
287 return NULL;
288}
289EXPORT_SYMBOL(cfg80211_find_vendor_ie);
290
2a519311
JB
291static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
292{
c21dbf92
JB
293 const u8 *ie1 = cfg80211_find_ie(num, ies1, len1);
294 const u8 *ie2 = cfg80211_find_ie(num, ies2, len2);
2a519311 295
3b6ef633 296 /* equal if both missing */
2a519311
JB
297 if (!ie1 && !ie2)
298 return 0;
3b6ef633
JB
299 /* sort missing IE before (left of) present IE */
300 if (!ie1)
2a519311 301 return -1;
3b6ef633
JB
302 if (!ie2)
303 return 1;
2a519311 304
3b6ef633
JB
305 /* sort by length first, then by contents */
306 if (ie1[1] != ie2[1])
2a519311 307 return ie2[1] - ie1[1];
3b6ef633 308 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
2a519311
JB
309}
310
915de2ff 311static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
2a519311
JB
312 const u8 *ssid, size_t ssid_len)
313{
314 const u8 *ssidie;
315
ac422d3c 316 if (bssid && !ether_addr_equal(a->bssid, bssid))
2a519311
JB
317 return false;
318
79420f09
JB
319 if (!ssid)
320 return true;
321
c21dbf92
JB
322 ssidie = cfg80211_find_ie(WLAN_EID_SSID,
323 a->information_elements,
324 a->len_information_elements);
2a519311
JB
325 if (!ssidie)
326 return false;
327 if (ssidie[1] != ssid_len)
328 return false;
329 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
330}
331
333ba732
EP
332static bool is_mesh_bss(struct cfg80211_bss *a)
333{
334 const u8 *ie;
335
336 if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
337 return false;
338
339 ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
340 a->information_elements,
341 a->len_information_elements);
342 if (!ie)
343 return false;
344
345 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
346 a->information_elements,
347 a->len_information_elements);
348 if (!ie)
349 return false;
350
351 return true;
352}
353
2a519311
JB
354static bool is_mesh(struct cfg80211_bss *a,
355 const u8 *meshid, size_t meshidlen,
356 const u8 *meshcfg)
357{
358 const u8 *ie;
359
333ba732 360 if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
2a519311
JB
361 return false;
362
c21dbf92
JB
363 ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
364 a->information_elements,
365 a->len_information_elements);
2a519311
JB
366 if (!ie)
367 return false;
368 if (ie[1] != meshidlen)
369 return false;
370 if (memcmp(ie + 2, meshid, meshidlen))
371 return false;
372
c21dbf92
JB
373 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
374 a->information_elements,
375 a->len_information_elements);
cd3468ba
JB
376 if (!ie)
377 return false;
136cfa28 378 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
2a519311
JB
379 return false;
380
381 /*
382 * Ignore mesh capability (last two bytes of the IE) when
383 * comparing since that may differ between stations taking
384 * part in the same mesh.
385 */
136cfa28 386 return memcmp(ie + 2, meshcfg,
915de2ff 387 sizeof(struct ieee80211_meshconf_ie) - 2) == 0;
2a519311
JB
388}
389
915de2ff 390static int cmp_bss_core(struct cfg80211_bss *a, struct cfg80211_bss *b)
2a519311
JB
391{
392 int r;
393
394 if (a->channel != b->channel)
395 return b->channel->center_freq - a->channel->center_freq;
396
333ba732 397 if (is_mesh_bss(a) && is_mesh_bss(b)) {
2a519311
JB
398 r = cmp_ies(WLAN_EID_MESH_ID,
399 a->information_elements,
400 a->len_information_elements,
401 b->information_elements,
402 b->len_information_elements);
403 if (r)
404 return r;
405 return cmp_ies(WLAN_EID_MESH_CONFIG,
406 a->information_elements,
407 a->len_information_elements,
408 b->information_elements,
409 b->len_information_elements);
410 }
411
ef9456a8
EG
412 /*
413 * we can't use compare_ether_addr here since we need a < > operator.
414 * The binary return value of compare_ether_addr isn't enough
415 */
416 return memcmp(a->bssid, b->bssid, sizeof(a->bssid));
dd9dfb9f
DT
417}
418
419static int cmp_bss(struct cfg80211_bss *a,
420 struct cfg80211_bss *b)
421{
422 int r;
423
424 r = cmp_bss_core(a, b);
0a35d36d
JC
425 if (r)
426 return r;
427
2a519311
JB
428 return cmp_ies(WLAN_EID_SSID,
429 a->information_elements,
430 a->len_information_elements,
431 b->information_elements,
432 b->len_information_elements);
433}
434
915de2ff 435static int cmp_hidden_bss(struct cfg80211_bss *a, struct cfg80211_bss *b)
dd9dfb9f
DT
436{
437 const u8 *ie1;
438 const u8 *ie2;
439 int i;
440 int r;
441
442 r = cmp_bss_core(a, b);
443 if (r)
444 return r;
445
446 ie1 = cfg80211_find_ie(WLAN_EID_SSID,
915de2ff
JB
447 a->information_elements,
448 a->len_information_elements);
dd9dfb9f 449 ie2 = cfg80211_find_ie(WLAN_EID_SSID,
915de2ff
JB
450 b->information_elements,
451 b->len_information_elements);
dd9dfb9f 452
f94f8b16
JB
453 /*
454 * Key comparator must use same algorithm in any rb-tree
dd9dfb9f
DT
455 * search function (order is important), otherwise ordering
456 * of items in the tree is broken and search gives incorrect
f94f8b16
JB
457 * results. This code uses same order as cmp_ies() does.
458 *
459 * Note that due to the differring behaviour with hidden SSIDs
460 * this function only works when "b" is the tree element and
461 * "a" is the key we're looking for.
462 */
dd9dfb9f
DT
463
464 /* sort missing IE before (left of) present IE */
465 if (!ie1)
466 return -1;
467 if (!ie2)
468 return 1;
469
470 /* zero-size SSID is used as an indication of the hidden bss */
471 if (!ie2[1])
472 return 0;
473
474 /* sort by length first, then by contents */
475 if (ie1[1] != ie2[1])
476 return ie2[1] - ie1[1];
477
f94f8b16
JB
478 /*
479 * zeroed SSID ie is another indication of a hidden bss;
480 * if it isn't zeroed just return the regular sort value
481 * to find the next candidate
482 */
dd9dfb9f
DT
483 for (i = 0; i < ie2[1]; i++)
484 if (ie2[i + 2])
f94f8b16 485 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
dd9dfb9f
DT
486
487 return 0;
488}
489
2a519311
JB
490struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
491 struct ieee80211_channel *channel,
492 const u8 *bssid,
79420f09
JB
493 const u8 *ssid, size_t ssid_len,
494 u16 capa_mask, u16 capa_val)
2a519311
JB
495{
496 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
497 struct cfg80211_internal_bss *bss, *res = NULL;
ccb6c136 498 unsigned long now = jiffies;
2a519311 499
4ee3e063
BL
500 trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, capa_mask,
501 capa_val);
502
2a519311
JB
503 spin_lock_bh(&dev->bss_lock);
504
505 list_for_each_entry(bss, &dev->bss_list, list) {
79420f09
JB
506 if ((bss->pub.capability & capa_mask) != capa_val)
507 continue;
2a519311
JB
508 if (channel && bss->pub.channel != channel)
509 continue;
ccb6c136
JB
510 /* Don't get expired BSS structs */
511 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
512 !atomic_read(&bss->hold))
513 continue;
2a519311
JB
514 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
515 res = bss;
516 kref_get(&res->ref);
517 break;
518 }
519 }
520
521 spin_unlock_bh(&dev->bss_lock);
522 if (!res)
523 return NULL;
4ee3e063 524 trace_cfg80211_return_bss(&res->pub);
2a519311
JB
525 return &res->pub;
526}
527EXPORT_SYMBOL(cfg80211_get_bss);
528
529struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
530 struct ieee80211_channel *channel,
531 const u8 *meshid, size_t meshidlen,
532 const u8 *meshcfg)
533{
534 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
535 struct cfg80211_internal_bss *bss, *res = NULL;
536
537 spin_lock_bh(&dev->bss_lock);
538
539 list_for_each_entry(bss, &dev->bss_list, list) {
540 if (channel && bss->pub.channel != channel)
541 continue;
542 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
543 res = bss;
544 kref_get(&res->ref);
545 break;
546 }
547 }
548
549 spin_unlock_bh(&dev->bss_lock);
550 if (!res)
551 return NULL;
552 return &res->pub;
553}
554EXPORT_SYMBOL(cfg80211_get_mesh);
555
556
557static void rb_insert_bss(struct cfg80211_registered_device *dev,
558 struct cfg80211_internal_bss *bss)
559{
560 struct rb_node **p = &dev->bss_tree.rb_node;
561 struct rb_node *parent = NULL;
562 struct cfg80211_internal_bss *tbss;
563 int cmp;
564
565 while (*p) {
566 parent = *p;
567 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
568
569 cmp = cmp_bss(&bss->pub, &tbss->pub);
570
571 if (WARN_ON(!cmp)) {
572 /* will sort of leak this BSS */
573 return;
574 }
575
576 if (cmp < 0)
577 p = &(*p)->rb_left;
578 else
579 p = &(*p)->rb_right;
580 }
581
582 rb_link_node(&bss->rbn, parent, p);
583 rb_insert_color(&bss->rbn, &dev->bss_tree);
584}
585
586static struct cfg80211_internal_bss *
587rb_find_bss(struct cfg80211_registered_device *dev,
588 struct cfg80211_internal_bss *res)
589{
590 struct rb_node *n = dev->bss_tree.rb_node;
591 struct cfg80211_internal_bss *bss;
592 int r;
593
594 while (n) {
595 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
596 r = cmp_bss(&res->pub, &bss->pub);
597
598 if (r == 0)
599 return bss;
600 else if (r < 0)
601 n = n->rb_left;
602 else
603 n = n->rb_right;
604 }
605
606 return NULL;
607}
608
dd9dfb9f
DT
609static struct cfg80211_internal_bss *
610rb_find_hidden_bss(struct cfg80211_registered_device *dev,
915de2ff 611 struct cfg80211_internal_bss *res)
dd9dfb9f
DT
612{
613 struct rb_node *n = dev->bss_tree.rb_node;
614 struct cfg80211_internal_bss *bss;
615 int r;
616
617 while (n) {
618 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
619 r = cmp_hidden_bss(&res->pub, &bss->pub);
620
621 if (r == 0)
622 return bss;
623 else if (r < 0)
624 n = n->rb_left;
625 else
626 n = n->rb_right;
627 }
628
629 return NULL;
630}
631
632static void
633copy_hidden_ies(struct cfg80211_internal_bss *res,
915de2ff 634 struct cfg80211_internal_bss *hidden)
dd9dfb9f
DT
635{
636 if (unlikely(res->pub.beacon_ies))
637 return;
638 if (WARN_ON(!hidden->pub.beacon_ies))
639 return;
640
641 res->pub.beacon_ies = kmalloc(hidden->pub.len_beacon_ies, GFP_ATOMIC);
642 if (unlikely(!res->pub.beacon_ies))
643 return;
644
645 res->beacon_ies_allocated = true;
646 res->pub.len_beacon_ies = hidden->pub.len_beacon_ies;
647 memcpy(res->pub.beacon_ies, hidden->pub.beacon_ies,
915de2ff 648 res->pub.len_beacon_ies);
dd9dfb9f
DT
649}
650
2a519311
JB
651static struct cfg80211_internal_bss *
652cfg80211_bss_update(struct cfg80211_registered_device *dev,
34a6eddb 653 struct cfg80211_internal_bss *res)
2a519311
JB
654{
655 struct cfg80211_internal_bss *found = NULL;
2a519311
JB
656
657 /*
658 * The reference to "res" is donated to this function.
659 */
660
661 if (WARN_ON(!res->pub.channel)) {
662 kref_put(&res->ref, bss_release);
663 return NULL;
664 }
665
666 res->ts = jiffies;
667
2a519311
JB
668 spin_lock_bh(&dev->bss_lock);
669
670 found = rb_find_bss(dev, res);
671
cd1658f5 672 if (found) {
2a519311
JB
673 found->pub.beacon_interval = res->pub.beacon_interval;
674 found->pub.tsf = res->pub.tsf;
675 found->pub.signal = res->pub.signal;
2a519311
JB
676 found->pub.capability = res->pub.capability;
677 found->ts = res->ts;
cd1658f5 678
34a6eddb
JM
679 /* Update IEs */
680 if (res->pub.proberesp_ies) {
cd1658f5 681 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
34a6eddb
JM
682 size_t ielen = res->pub.len_proberesp_ies;
683
684 if (found->pub.proberesp_ies &&
685 !found->proberesp_ies_allocated &&
686 ksize(found) >= used + ielen) {
687 memcpy(found->pub.proberesp_ies,
688 res->pub.proberesp_ies, ielen);
689 found->pub.len_proberesp_ies = ielen;
690 } else {
691 u8 *ies = found->pub.proberesp_ies;
692
693 if (found->proberesp_ies_allocated)
694 ies = krealloc(ies, ielen, GFP_ATOMIC);
695 else
696 ies = kmalloc(ielen, GFP_ATOMIC);
697
698 if (ies) {
699 memcpy(ies, res->pub.proberesp_ies,
700 ielen);
701 found->proberesp_ies_allocated = true;
702 found->pub.proberesp_ies = ies;
703 found->pub.len_proberesp_ies = ielen;
704 }
705 }
cd1658f5 706
34a6eddb
JM
707 /* Override possible earlier Beacon frame IEs */
708 found->pub.information_elements =
709 found->pub.proberesp_ies;
710 found->pub.len_information_elements =
711 found->pub.len_proberesp_ies;
712 }
915de2ff 713
34a6eddb
JM
714 if (res->pub.beacon_ies) {
715 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
716 size_t ielen = res->pub.len_beacon_ies;
01123e23
SN
717 bool information_elements_is_beacon_ies =
718 (found->pub.information_elements ==
719 found->pub.beacon_ies);
34a6eddb
JM
720
721 if (found->pub.beacon_ies &&
722 !found->beacon_ies_allocated &&
723 ksize(found) >= used + ielen) {
724 memcpy(found->pub.beacon_ies,
725 res->pub.beacon_ies, ielen);
726 found->pub.len_beacon_ies = ielen;
cd1658f5 727 } else {
34a6eddb 728 u8 *ies = found->pub.beacon_ies;
cd1658f5 729
34a6eddb 730 if (found->beacon_ies_allocated)
273de92c
MB
731 ies = krealloc(ies, ielen, GFP_ATOMIC);
732 else
cd1658f5
JB
733 ies = kmalloc(ielen, GFP_ATOMIC);
734
735 if (ies) {
34a6eddb
JM
736 memcpy(ies, res->pub.beacon_ies,
737 ielen);
738 found->beacon_ies_allocated = true;
739 found->pub.beacon_ies = ies;
740 found->pub.len_beacon_ies = ielen;
cd1658f5
JB
741 }
742 }
01123e23
SN
743
744 /* Override IEs if they were from a beacon before */
745 if (information_elements_is_beacon_ies) {
746 found->pub.information_elements =
747 found->pub.beacon_ies;
748 found->pub.len_information_elements =
749 found->pub.len_beacon_ies;
750 }
cd1658f5
JB
751 }
752
2a519311
JB
753 kref_put(&res->ref, bss_release);
754 } else {
dd9dfb9f
DT
755 struct cfg80211_internal_bss *hidden;
756
757 /* First check if the beacon is a probe response from
758 * a hidden bss. If so, copy beacon ies (with nullified
759 * ssid) into the probe response bss entry (with real ssid).
760 * It is required basically for PSM implementation
761 * (probe responses do not contain tim ie) */
762
763 /* TODO: The code is not trying to update existing probe
764 * response bss entries when beacon ies are
765 * getting changed. */
766 hidden = rb_find_hidden_bss(dev, res);
767 if (hidden)
768 copy_hidden_ies(res, hidden);
769
2a519311
JB
770 /* this "consumes" the reference */
771 list_add_tail(&res->list, &dev->bss_list);
772 rb_insert_bss(dev, res);
773 found = res;
774 }
775
776 dev->bss_generation++;
777 spin_unlock_bh(&dev->bss_lock);
778
779 kref_get(&found->ref);
780 return found;
781}
782
0172bb75
JB
783static struct ieee80211_channel *
784cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
785 struct ieee80211_channel *channel)
786{
787 const u8 *tmp;
788 u32 freq;
789 int channel_number = -1;
790
791 tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen);
792 if (tmp && tmp[1] == 1) {
793 channel_number = tmp[2];
794 } else {
795 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen);
796 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) {
797 struct ieee80211_ht_operation *htop = (void *)(tmp + 2);
798
799 channel_number = htop->primary_chan;
800 }
801 }
802
803 if (channel_number < 0)
804 return channel;
805
806 freq = ieee80211_channel_to_frequency(channel_number, channel->band);
807 channel = ieee80211_get_channel(wiphy, freq);
808 if (!channel)
809 return NULL;
810 if (channel->flags & IEEE80211_CHAN_DISABLED)
811 return NULL;
812 return channel;
813}
814
06aa7afa
JK
815struct cfg80211_bss*
816cfg80211_inform_bss(struct wiphy *wiphy,
817 struct ieee80211_channel *channel,
7b8bcff2
JB
818 const u8 *bssid, u64 tsf, u16 capability,
819 u16 beacon_interval, const u8 *ie, size_t ielen,
06aa7afa
JK
820 s32 signal, gfp_t gfp)
821{
822 struct cfg80211_internal_bss *res;
823 size_t privsz;
824
825 if (WARN_ON(!wiphy))
826 return NULL;
827
828 privsz = wiphy->bss_priv_size;
829
22fe88d3 830 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
06aa7afa
JK
831 (signal < 0 || signal > 100)))
832 return NULL;
833
0172bb75
JB
834 channel = cfg80211_get_bss_channel(wiphy, ie, ielen, channel);
835 if (!channel)
836 return NULL;
837
06aa7afa
JK
838 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
839 if (!res)
840 return NULL;
841
842 memcpy(res->pub.bssid, bssid, ETH_ALEN);
843 res->pub.channel = channel;
844 res->pub.signal = signal;
7b8bcff2 845 res->pub.tsf = tsf;
06aa7afa
JK
846 res->pub.beacon_interval = beacon_interval;
847 res->pub.capability = capability;
34a6eddb
JM
848 /*
849 * Since we do not know here whether the IEs are from a Beacon or Probe
850 * Response frame, we need to pick one of the options and only use it
851 * with the driver that does not provide the full Beacon/Probe Response
852 * frame. Use Beacon frame pointer to avoid indicating that this should
853 * override the information_elements pointer should we have received an
854 * earlier indication of Probe Response data.
855 *
856 * The initial buffer for the IEs is allocated with the BSS entry and
857 * is located after the private area.
858 */
859 res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz;
860 memcpy(res->pub.beacon_ies, ie, ielen);
861 res->pub.len_beacon_ies = ielen;
862 res->pub.information_elements = res->pub.beacon_ies;
863 res->pub.len_information_elements = res->pub.len_beacon_ies;
06aa7afa
JK
864
865 kref_init(&res->ref);
866
34a6eddb 867 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
06aa7afa
JK
868 if (!res)
869 return NULL;
870
871 if (res->pub.capability & WLAN_CAPABILITY_ESS)
872 regulatory_hint_found_beacon(wiphy, channel, gfp);
873
4ee3e063 874 trace_cfg80211_return_bss(&res->pub);
06aa7afa
JK
875 /* cfg80211_bss_update gives us a referenced result */
876 return &res->pub;
877}
878EXPORT_SYMBOL(cfg80211_inform_bss);
879
2a519311
JB
880struct cfg80211_bss *
881cfg80211_inform_bss_frame(struct wiphy *wiphy,
882 struct ieee80211_channel *channel,
883 struct ieee80211_mgmt *mgmt, size_t len,
77965c97 884 s32 signal, gfp_t gfp)
2a519311
JB
885{
886 struct cfg80211_internal_bss *res;
887 size_t ielen = len - offsetof(struct ieee80211_mgmt,
888 u.probe_resp.variable);
bef9bacc
MK
889 size_t privsz;
890
0172bb75
JB
891 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
892 offsetof(struct ieee80211_mgmt, u.beacon.variable));
893
4ee3e063
BL
894 trace_cfg80211_inform_bss_frame(wiphy, channel, mgmt, len, signal);
895
bef9bacc
MK
896 if (WARN_ON(!mgmt))
897 return NULL;
898
899 if (WARN_ON(!wiphy))
900 return NULL;
2a519311 901
22fe88d3 902 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
768be59f 903 (signal < 0 || signal > 100)))
2a519311
JB
904 return NULL;
905
bef9bacc 906 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
2a519311
JB
907 return NULL;
908
bef9bacc
MK
909 privsz = wiphy->bss_priv_size;
910
0172bb75
JB
911 channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable,
912 ielen, channel);
913 if (!channel)
914 return NULL;
915
2a519311
JB
916 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
917 if (!res)
918 return NULL;
919
920 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
921 res->pub.channel = channel;
2a519311
JB
922 res->pub.signal = signal;
923 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
924 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
925 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
34a6eddb
JM
926 /*
927 * The initial buffer for the IEs is allocated with the BSS entry and
928 * is located after the private area.
929 */
930 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
931 res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz;
932 memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable,
933 ielen);
934 res->pub.len_proberesp_ies = ielen;
935 res->pub.information_elements = res->pub.proberesp_ies;
936 res->pub.len_information_elements = res->pub.len_proberesp_ies;
937 } else {
938 res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz;
939 memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen);
940 res->pub.len_beacon_ies = ielen;
941 res->pub.information_elements = res->pub.beacon_ies;
942 res->pub.len_information_elements = res->pub.len_beacon_ies;
943 }
2a519311
JB
944
945 kref_init(&res->ref);
946
34a6eddb 947 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
2a519311
JB
948 if (!res)
949 return NULL;
950
e38f8a7a
LR
951 if (res->pub.capability & WLAN_CAPABILITY_ESS)
952 regulatory_hint_found_beacon(wiphy, channel, gfp);
953
4ee3e063 954 trace_cfg80211_return_bss(&res->pub);
2a519311
JB
955 /* cfg80211_bss_update gives us a referenced result */
956 return &res->pub;
957}
958EXPORT_SYMBOL(cfg80211_inform_bss_frame);
959
4c0c0b75
JB
960void cfg80211_ref_bss(struct cfg80211_bss *pub)
961{
962 struct cfg80211_internal_bss *bss;
963
964 if (!pub)
965 return;
966
967 bss = container_of(pub, struct cfg80211_internal_bss, pub);
968 kref_get(&bss->ref);
969}
970EXPORT_SYMBOL(cfg80211_ref_bss);
971
2a519311
JB
972void cfg80211_put_bss(struct cfg80211_bss *pub)
973{
974 struct cfg80211_internal_bss *bss;
975
976 if (!pub)
977 return;
978
979 bss = container_of(pub, struct cfg80211_internal_bss, pub);
980 kref_put(&bss->ref, bss_release);
981}
982EXPORT_SYMBOL(cfg80211_put_bss);
983
d491af19
JB
984void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
985{
986 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
987 struct cfg80211_internal_bss *bss;
988
989 if (WARN_ON(!pub))
990 return;
991
992 bss = container_of(pub, struct cfg80211_internal_bss, pub);
993
994 spin_lock_bh(&dev->bss_lock);
3207390a 995 if (!list_empty(&bss->list)) {
2b78ac9b 996 __cfg80211_unlink_bss(dev, bss);
3207390a 997 dev->bss_generation++;
3207390a 998 }
d491af19 999 spin_unlock_bh(&dev->bss_lock);
d491af19
JB
1000}
1001EXPORT_SYMBOL(cfg80211_unlink_bss);
1002
3d23e349 1003#ifdef CONFIG_CFG80211_WEXT
2a519311
JB
1004int cfg80211_wext_siwscan(struct net_device *dev,
1005 struct iw_request_info *info,
1006 union iwreq_data *wrqu, char *extra)
1007{
1008 struct cfg80211_registered_device *rdev;
1009 struct wiphy *wiphy;
1010 struct iw_scan_req *wreq = NULL;
65486c8b 1011 struct cfg80211_scan_request *creq = NULL;
2a519311
JB
1012 int i, err, n_channels = 0;
1013 enum ieee80211_band band;
1014
1015 if (!netif_running(dev))
1016 return -ENETDOWN;
1017
b2e3abdc
HS
1018 if (wrqu->data.length == sizeof(struct iw_scan_req))
1019 wreq = (struct iw_scan_req *)extra;
1020
463d0183 1021 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2a519311
JB
1022
1023 if (IS_ERR(rdev))
1024 return PTR_ERR(rdev);
1025
1026 if (rdev->scan_req) {
1027 err = -EBUSY;
1028 goto out;
1029 }
1030
1031 wiphy = &rdev->wiphy;
1032
b2e3abdc
HS
1033 /* Determine number of channels, needed to allocate creq */
1034 if (wreq && wreq->num_channels)
1035 n_channels = wreq->num_channels;
1036 else {
1037 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1038 if (wiphy->bands[band])
1039 n_channels += wiphy->bands[band]->n_channels;
1040 }
2a519311
JB
1041
1042 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
1043 n_channels * sizeof(void *),
1044 GFP_ATOMIC);
1045 if (!creq) {
1046 err = -ENOMEM;
1047 goto out;
1048 }
1049
1050 creq->wiphy = wiphy;
fd014284 1051 creq->wdev = dev->ieee80211_ptr;
5ba63533
JB
1052 /* SSIDs come after channels */
1053 creq->ssids = (void *)&creq->channels[n_channels];
2a519311
JB
1054 creq->n_channels = n_channels;
1055 creq->n_ssids = 1;
15d6030b 1056 creq->scan_start = jiffies;
2a519311 1057
b2e3abdc 1058 /* translate "Scan on frequencies" request */
2a519311
JB
1059 i = 0;
1060 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1061 int j;
584991dc 1062
2a519311
JB
1063 if (!wiphy->bands[band])
1064 continue;
584991dc 1065
2a519311 1066 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
584991dc
JB
1067 /* ignore disabled channels */
1068 if (wiphy->bands[band]->channels[j].flags &
1069 IEEE80211_CHAN_DISABLED)
1070 continue;
b2e3abdc
HS
1071
1072 /* If we have a wireless request structure and the
1073 * wireless request specifies frequencies, then search
1074 * for the matching hardware channel.
1075 */
1076 if (wreq && wreq->num_channels) {
1077 int k;
1078 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
1079 for (k = 0; k < wreq->num_channels; k++) {
a4e7b730 1080 int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]);
b2e3abdc
HS
1081 if (wext_freq == wiphy_freq)
1082 goto wext_freq_found;
1083 }
1084 goto wext_freq_not_found;
1085 }
1086
1087 wext_freq_found:
2a519311
JB
1088 creq->channels[i] = &wiphy->bands[band]->channels[j];
1089 i++;
b2e3abdc 1090 wext_freq_not_found: ;
2a519311
JB
1091 }
1092 }
8862dc5f
HS
1093 /* No channels found? */
1094 if (!i) {
1095 err = -EINVAL;
1096 goto out;
1097 }
2a519311 1098
b2e3abdc
HS
1099 /* Set real number of channels specified in creq->channels[] */
1100 creq->n_channels = i;
2a519311 1101
b2e3abdc
HS
1102 /* translate "Scan for SSID" request */
1103 if (wreq) {
2a519311 1104 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
65486c8b
JB
1105 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
1106 err = -EINVAL;
1107 goto out;
1108 }
2a519311
JB
1109 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
1110 creq->ssids[0].ssid_len = wreq->essid_len;
1111 }
1112 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
1113 creq->n_ssids = 0;
1114 }
1115
34850ab2 1116 for (i = 0; i < IEEE80211_NUM_BANDS; i++)
a401d2bb
JB
1117 if (wiphy->bands[i])
1118 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
34850ab2 1119
2a519311 1120 rdev->scan_req = creq;
e35e4d28 1121 err = rdev_scan(rdev, creq);
2a519311
JB
1122 if (err) {
1123 rdev->scan_req = NULL;
65486c8b 1124 /* creq will be freed below */
463d0183 1125 } else {
fd014284 1126 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
65486c8b
JB
1127 /* creq now owned by driver */
1128 creq = NULL;
463d0183
JB
1129 dev_hold(dev);
1130 }
2a519311 1131 out:
65486c8b 1132 kfree(creq);
4d0c8aea 1133 cfg80211_unlock_rdev(rdev);
2a519311
JB
1134 return err;
1135}
ba44cb72 1136EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
2a519311
JB
1137
1138static void ieee80211_scan_add_ies(struct iw_request_info *info,
1139 struct cfg80211_bss *bss,
1140 char **current_ev, char *end_buf)
1141{
1142 u8 *pos, *end, *next;
1143 struct iw_event iwe;
1144
1145 if (!bss->information_elements ||
1146 !bss->len_information_elements)
1147 return;
1148
1149 /*
1150 * If needed, fragment the IEs buffer (at IE boundaries) into short
1151 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
1152 */
1153 pos = bss->information_elements;
1154 end = pos + bss->len_information_elements;
1155
1156 while (end - pos > IW_GENERIC_IE_MAX) {
1157 next = pos + 2 + pos[1];
1158 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
1159 next = next + 2 + next[1];
1160
1161 memset(&iwe, 0, sizeof(iwe));
1162 iwe.cmd = IWEVGENIE;
1163 iwe.u.data.length = next - pos;
1164 *current_ev = iwe_stream_add_point(info, *current_ev,
1165 end_buf, &iwe, pos);
1166
1167 pos = next;
1168 }
1169
1170 if (end > pos) {
1171 memset(&iwe, 0, sizeof(iwe));
1172 iwe.cmd = IWEVGENIE;
1173 iwe.u.data.length = end - pos;
1174 *current_ev = iwe_stream_add_point(info, *current_ev,
1175 end_buf, &iwe, pos);
1176 }
1177}
1178
cb3a8eec
DW
1179static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
1180{
1181 unsigned long end = jiffies;
1182
1183 if (end >= start)
1184 return jiffies_to_msecs(end - start);
1185
1186 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
1187}
2a519311
JB
1188
1189static char *
77965c97
JB
1190ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
1191 struct cfg80211_internal_bss *bss, char *current_ev,
1192 char *end_buf)
2a519311
JB
1193{
1194 struct iw_event iwe;
1195 u8 *buf, *cfg, *p;
1196 u8 *ie = bss->pub.information_elements;
a77b8552 1197 int rem = bss->pub.len_information_elements, i, sig;
2a519311
JB
1198 bool ismesh = false;
1199
1200 memset(&iwe, 0, sizeof(iwe));
1201 iwe.cmd = SIOCGIWAP;
1202 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1203 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
1204 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1205 IW_EV_ADDR_LEN);
1206
1207 memset(&iwe, 0, sizeof(iwe));
1208 iwe.cmd = SIOCGIWFREQ;
1209 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
1210 iwe.u.freq.e = 0;
1211 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1212 IW_EV_FREQ_LEN);
1213
1214 memset(&iwe, 0, sizeof(iwe));
1215 iwe.cmd = SIOCGIWFREQ;
1216 iwe.u.freq.m = bss->pub.channel->center_freq;
1217 iwe.u.freq.e = 6;
1218 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1219 IW_EV_FREQ_LEN);
1220
77965c97 1221 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
2a519311
JB
1222 memset(&iwe, 0, sizeof(iwe));
1223 iwe.cmd = IWEVQUAL;
1224 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
1225 IW_QUAL_NOISE_INVALID |
a77b8552 1226 IW_QUAL_QUAL_UPDATED;
77965c97 1227 switch (wiphy->signal_type) {
2a519311 1228 case CFG80211_SIGNAL_TYPE_MBM:
a77b8552
JB
1229 sig = bss->pub.signal / 100;
1230 iwe.u.qual.level = sig;
2a519311 1231 iwe.u.qual.updated |= IW_QUAL_DBM;
a77b8552
JB
1232 if (sig < -110) /* rather bad */
1233 sig = -110;
1234 else if (sig > -40) /* perfect */
1235 sig = -40;
1236 /* will give a range of 0 .. 70 */
1237 iwe.u.qual.qual = sig + 110;
2a519311
JB
1238 break;
1239 case CFG80211_SIGNAL_TYPE_UNSPEC:
1240 iwe.u.qual.level = bss->pub.signal;
a77b8552
JB
1241 /* will give range 0 .. 100 */
1242 iwe.u.qual.qual = bss->pub.signal;
2a519311
JB
1243 break;
1244 default:
1245 /* not reached */
1246 break;
1247 }
1248 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1249 &iwe, IW_EV_QUAL_LEN);
1250 }
1251
1252 memset(&iwe, 0, sizeof(iwe));
1253 iwe.cmd = SIOCGIWENCODE;
1254 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
1255 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1256 else
1257 iwe.u.data.flags = IW_ENCODE_DISABLED;
1258 iwe.u.data.length = 0;
1259 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1260 &iwe, "");
1261
1262 while (rem >= 2) {
1263 /* invalid data */
1264 if (ie[1] > rem - 2)
1265 break;
1266
1267 switch (ie[0]) {
1268 case WLAN_EID_SSID:
1269 memset(&iwe, 0, sizeof(iwe));
1270 iwe.cmd = SIOCGIWESSID;
1271 iwe.u.data.length = ie[1];
1272 iwe.u.data.flags = 1;
1273 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1274 &iwe, ie + 2);
1275 break;
1276 case WLAN_EID_MESH_ID:
1277 memset(&iwe, 0, sizeof(iwe));
1278 iwe.cmd = SIOCGIWESSID;
1279 iwe.u.data.length = ie[1];
1280 iwe.u.data.flags = 1;
1281 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1282 &iwe, ie + 2);
1283 break;
1284 case WLAN_EID_MESH_CONFIG:
1285 ismesh = true;
136cfa28 1286 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
2a519311
JB
1287 break;
1288 buf = kmalloc(50, GFP_ATOMIC);
1289 if (!buf)
1290 break;
1291 cfg = ie + 2;
1292 memset(&iwe, 0, sizeof(iwe));
1293 iwe.cmd = IWEVCUSTOM;
76aa5e70
RP
1294 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
1295 "0x%02X", cfg[0]);
2a519311
JB
1296 iwe.u.data.length = strlen(buf);
1297 current_ev = iwe_stream_add_point(info, current_ev,
1298 end_buf,
1299 &iwe, buf);
76aa5e70
RP
1300 sprintf(buf, "Path Selection Metric ID: 0x%02X",
1301 cfg[1]);
2a519311
JB
1302 iwe.u.data.length = strlen(buf);
1303 current_ev = iwe_stream_add_point(info, current_ev,
1304 end_buf,
1305 &iwe, buf);
76aa5e70
RP
1306 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
1307 cfg[2]);
2a519311
JB
1308 iwe.u.data.length = strlen(buf);
1309 current_ev = iwe_stream_add_point(info, current_ev,
1310 end_buf,
1311 &iwe, buf);
76aa5e70 1312 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
2a519311
JB
1313 iwe.u.data.length = strlen(buf);
1314 current_ev = iwe_stream_add_point(info, current_ev,
1315 end_buf,
1316 &iwe, buf);
76aa5e70
RP
1317 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
1318 iwe.u.data.length = strlen(buf);
1319 current_ev = iwe_stream_add_point(info, current_ev,
1320 end_buf,
1321 &iwe, buf);
1322 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
1323 iwe.u.data.length = strlen(buf);
1324 current_ev = iwe_stream_add_point(info, current_ev,
1325 end_buf,
1326 &iwe, buf);
1327 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
2a519311
JB
1328 iwe.u.data.length = strlen(buf);
1329 current_ev = iwe_stream_add_point(info, current_ev,
1330 end_buf,
1331 &iwe, buf);
1332 kfree(buf);
1333 break;
1334 case WLAN_EID_SUPP_RATES:
1335 case WLAN_EID_EXT_SUPP_RATES:
1336 /* display all supported rates in readable format */
1337 p = current_ev + iwe_stream_lcp_len(info);
1338
1339 memset(&iwe, 0, sizeof(iwe));
1340 iwe.cmd = SIOCGIWRATE;
1341 /* Those two flags are ignored... */
1342 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
1343
1344 for (i = 0; i < ie[1]; i++) {
1345 iwe.u.bitrate.value =
1346 ((ie[i + 2] & 0x7f) * 500000);
1347 p = iwe_stream_add_value(info, current_ev, p,
1348 end_buf, &iwe, IW_EV_PARAM_LEN);
1349 }
1350 current_ev = p;
1351 break;
1352 }
1353 rem -= ie[1] + 2;
1354 ie += ie[1] + 2;
1355 }
1356
f64f9e71
JP
1357 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
1358 ismesh) {
2a519311
JB
1359 memset(&iwe, 0, sizeof(iwe));
1360 iwe.cmd = SIOCGIWMODE;
1361 if (ismesh)
1362 iwe.u.mode = IW_MODE_MESH;
1363 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
1364 iwe.u.mode = IW_MODE_MASTER;
1365 else
1366 iwe.u.mode = IW_MODE_ADHOC;
1367 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1368 &iwe, IW_EV_UINT_LEN);
1369 }
1370
1371 buf = kmalloc(30, GFP_ATOMIC);
1372 if (buf) {
1373 memset(&iwe, 0, sizeof(iwe));
1374 iwe.cmd = IWEVCUSTOM;
1375 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
1376 iwe.u.data.length = strlen(buf);
1377 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1378 &iwe, buf);
1379 memset(&iwe, 0, sizeof(iwe));
1380 iwe.cmd = IWEVCUSTOM;
cb3a8eec
DW
1381 sprintf(buf, " Last beacon: %ums ago",
1382 elapsed_jiffies_msecs(bss->ts));
2a519311
JB
1383 iwe.u.data.length = strlen(buf);
1384 current_ev = iwe_stream_add_point(info, current_ev,
1385 end_buf, &iwe, buf);
1386 kfree(buf);
1387 }
1388
1389 ieee80211_scan_add_ies(info, &bss->pub, &current_ev, end_buf);
1390
1391 return current_ev;
1392}
1393
1394
1395static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
1396 struct iw_request_info *info,
1397 char *buf, size_t len)
1398{
1399 char *current_ev = buf;
1400 char *end_buf = buf + len;
1401 struct cfg80211_internal_bss *bss;
1402
1403 spin_lock_bh(&dev->bss_lock);
1404 cfg80211_bss_expire(dev);
1405
1406 list_for_each_entry(bss, &dev->bss_list, list) {
1407 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
1408 spin_unlock_bh(&dev->bss_lock);
1409 return -E2BIG;
1410 }
77965c97
JB
1411 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
1412 current_ev, end_buf);
2a519311
JB
1413 }
1414 spin_unlock_bh(&dev->bss_lock);
1415 return current_ev - buf;
1416}
1417
1418
1419int cfg80211_wext_giwscan(struct net_device *dev,
1420 struct iw_request_info *info,
1421 struct iw_point *data, char *extra)
1422{
1423 struct cfg80211_registered_device *rdev;
1424 int res;
1425
1426 if (!netif_running(dev))
1427 return -ENETDOWN;
1428
463d0183 1429 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2a519311
JB
1430
1431 if (IS_ERR(rdev))
1432 return PTR_ERR(rdev);
1433
1434 if (rdev->scan_req) {
1435 res = -EAGAIN;
1436 goto out;
1437 }
1438
1439 res = ieee80211_scan_results(rdev, info, extra, data->length);
1440 data->length = 0;
1441 if (res >= 0) {
1442 data->length = res;
1443 res = 0;
1444 }
1445
1446 out:
4d0c8aea 1447 cfg80211_unlock_rdev(rdev);
2a519311
JB
1448 return res;
1449}
ba44cb72 1450EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);
2a519311 1451#endif