cfg80211: fix BSS list hidden SSID lookup
[linux-3.10.git] / net / wireless / scan.c
1 /*
2  * cfg80211 scan result handling
3  *
4  * Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
5  */
6 #include <linux/kernel.h>
7 #include <linux/slab.h>
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>
15 #include <net/cfg80211-wext.h>
16 #include <net/iw_handler.h>
17 #include "core.h"
18 #include "nl80211.h"
19 #include "wext-compat.h"
20 #include "rdev-ops.h"
21
22 #define IEEE80211_SCAN_RESULT_EXPIRE    (30 * HZ)
23
24 static void bss_release(struct kref *ref)
25 {
26         struct cfg80211_bss_ies *ies;
27         struct cfg80211_internal_bss *bss;
28
29         bss = container_of(ref, struct cfg80211_internal_bss, ref);
30
31         if (WARN_ON(atomic_read(&bss->hold)))
32                 return;
33
34         ies = (void *)rcu_access_pointer(bss->pub.beacon_ies);
35         if (ies)
36                 kfree_rcu(ies, rcu_head);
37         ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies);
38         if (ies)
39                 kfree_rcu(ies, rcu_head);
40
41         kfree(bss);
42 }
43
44 /* must hold dev->bss_lock! */
45 static 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
53 /* must hold dev->bss_lock! */
54 static 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
74 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak)
75 {
76         struct cfg80211_scan_request *request;
77         struct wireless_dev *wdev;
78 #ifdef CONFIG_CFG80211_WEXT
79         union iwreq_data wrqu;
80 #endif
81
82         ASSERT_RDEV_LOCK(rdev);
83
84         request = rdev->scan_req;
85
86         if (!request)
87                 return;
88
89         wdev = request->wdev;
90
91         /*
92          * This must be before sending the other events!
93          * Otherwise, wpa_supplicant gets completely confused with
94          * wext events.
95          */
96         if (wdev->netdev)
97                 cfg80211_sme_scan_done(wdev->netdev);
98
99         if (request->aborted) {
100                 nl80211_send_scan_aborted(rdev, wdev);
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                 }
108                 nl80211_send_scan_done(rdev, wdev);
109         }
110
111 #ifdef CONFIG_CFG80211_WEXT
112         if (wdev->netdev && !request->aborted) {
113                 memset(&wrqu, 0, sizeof(wrqu));
114
115                 wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
116         }
117 #endif
118
119         if (wdev->netdev)
120                 dev_put(wdev->netdev);
121
122         rdev->scan_req = NULL;
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);
134 }
135
136 void __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);
144         ___cfg80211_scan_done(rdev, false);
145         cfg80211_unlock_rdev(rdev);
146 }
147
148 void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
149 {
150         trace_cfg80211_scan_done(request, aborted);
151         WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);
152
153         request->aborted = aborted;
154         queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk);
155 }
156 EXPORT_SYMBOL(cfg80211_scan_done);
157
158 void __cfg80211_sched_scan_results(struct work_struct *wk)
159 {
160         struct cfg80211_registered_device *rdev;
161         struct cfg80211_sched_scan_request *request;
162
163         rdev = container_of(wk, struct cfg80211_registered_device,
164                             sched_scan_results_wk);
165
166         request = rdev->sched_scan_req;
167
168         mutex_lock(&rdev->sched_scan_mtx);
169
170         /* we don't have sched_scan_req anymore if the scan is stopping */
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         }
182
183         mutex_unlock(&rdev->sched_scan_mtx);
184 }
185
186 void cfg80211_sched_scan_results(struct wiphy *wiphy)
187 {
188         trace_cfg80211_sched_scan_results(wiphy);
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 }
194 EXPORT_SYMBOL(cfg80211_sched_scan_results);
195
196 void cfg80211_sched_scan_stopped(struct wiphy *wiphy)
197 {
198         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
199
200         trace_cfg80211_sched_scan_stopped(wiphy);
201
202         mutex_lock(&rdev->sched_scan_mtx);
203         __cfg80211_stop_sched_scan(rdev, true);
204         mutex_unlock(&rdev->sched_scan_mtx);
205 }
206 EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
207
208 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
209                                bool driver_initiated)
210 {
211         struct net_device *dev;
212
213         lockdep_assert_held(&rdev->sched_scan_mtx);
214
215         if (!rdev->sched_scan_req)
216                 return -ENOENT;
217
218         dev = rdev->sched_scan_req->dev;
219
220         if (!driver_initiated) {
221                 int err = rdev_sched_scan_stop(rdev, dev);
222                 if (err)
223                         return err;
224         }
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
231         return 0;
232 }
233
234 /* must hold dev->bss_lock! */
235 void 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
241         list_for_each_entry(bss, &dev->bss_list, list)
242                 bss->ts -= age_jiffies;
243 }
244
245 void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
246 {
247         __cfg80211_bss_expire(dev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
248 }
249
250 const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len)
251 {
252         while (len > 2 && ies[0] != eid) {
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 }
262 EXPORT_SYMBOL(cfg80211_find_ie);
263
264 const 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 }
289 EXPORT_SYMBOL(cfg80211_find_vendor_ie);
290
291 static int cmp_ies(u8 num, const u8 *ies1, int len1, const u8 *ies2, int len2)
292 {
293         const u8 *ie1 = cfg80211_find_ie(num, ies1, len1);
294         const u8 *ie2 = cfg80211_find_ie(num, ies2, len2);
295
296         /* equal if both missing */
297         if (!ie1 && !ie2)
298                 return 0;
299         /* sort missing IE before (left of) present IE */
300         if (!ie1)
301                 return -1;
302         if (!ie2)
303                 return 1;
304
305         /* sort by length first, then by contents */
306         if (ie1[1] != ie2[1])
307                 return ie2[1] - ie1[1];
308         return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
309 }
310
311 static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
312                    const u8 *ssid, size_t ssid_len)
313 {
314         const struct cfg80211_bss_ies *ies;
315         const u8 *ssidie;
316
317         if (bssid && !ether_addr_equal(a->bssid, bssid))
318                 return false;
319
320         if (!ssid)
321                 return true;
322
323         ies = rcu_access_pointer(a->ies);
324         if (!ies)
325                 return false;
326         ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
327         if (!ssidie)
328                 return false;
329         if (ssidie[1] != ssid_len)
330                 return false;
331         return memcmp(ssidie + 2, ssid, ssid_len) == 0;
332 }
333
334 static bool is_mesh_bss(struct cfg80211_bss *a)
335 {
336         const struct cfg80211_bss_ies *ies;
337         const u8 *ie;
338
339         if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
340                 return false;
341
342         ies = rcu_access_pointer(a->ies);
343         if (!ies)
344                 return false;
345
346         ie = cfg80211_find_ie(WLAN_EID_MESH_ID, ies->data, ies->len);
347         if (!ie)
348                 return false;
349
350         ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, ies->data, ies->len);
351         if (!ie)
352                 return false;
353
354         return true;
355 }
356
357 static bool is_mesh(struct cfg80211_bss *a,
358                     const u8 *meshid, size_t meshidlen,
359                     const u8 *meshcfg)
360 {
361         const struct cfg80211_bss_ies *ies;
362         const u8 *ie;
363
364         if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
365                 return false;
366
367         ies = rcu_access_pointer(a->ies);
368         if (!ies)
369                 return false;
370
371         ie = cfg80211_find_ie(WLAN_EID_MESH_ID, ies->data, ies->len);
372         if (!ie)
373                 return false;
374         if (ie[1] != meshidlen)
375                 return false;
376         if (memcmp(ie + 2, meshid, meshidlen))
377                 return false;
378
379         ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, ies->data, ies->len);
380         if (!ie)
381                 return false;
382         if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
383                 return false;
384
385         /*
386          * Ignore mesh capability (last two bytes of the IE) when
387          * comparing since that may differ between stations taking
388          * part in the same mesh.
389          */
390         return memcmp(ie + 2, meshcfg,
391                       sizeof(struct ieee80211_meshconf_ie) - 2) == 0;
392 }
393
394 static int cmp_bss_core(struct cfg80211_bss *a, struct cfg80211_bss *b)
395 {
396         const struct cfg80211_bss_ies *a_ies, *b_ies;
397         int r;
398
399         if (a->channel != b->channel)
400                 return b->channel->center_freq - a->channel->center_freq;
401
402         if (is_mesh_bss(a) && is_mesh_bss(b)) {
403                 a_ies = rcu_access_pointer(a->ies);
404                 if (!a_ies)
405                         return -1;
406                 b_ies = rcu_access_pointer(b->ies);
407                 if (!b_ies)
408                         return 1;
409
410                 r = cmp_ies(WLAN_EID_MESH_ID,
411                             a_ies->data, a_ies->len,
412                             b_ies->data, b_ies->len);
413                 if (r)
414                         return r;
415                 return cmp_ies(WLAN_EID_MESH_CONFIG,
416                                a_ies->data, a_ies->len,
417                                b_ies->data, b_ies->len);
418         }
419
420         /*
421          * we can't use compare_ether_addr here since we need a < > operator.
422          * The binary return value of compare_ether_addr isn't enough
423          */
424         return memcmp(a->bssid, b->bssid, sizeof(a->bssid));
425 }
426
427 /**
428  * enum bss_compare_mode - BSS compare mode
429  * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
430  * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
431  * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
432  */
433 enum bss_compare_mode {
434         BSS_CMP_REGULAR,
435         BSS_CMP_HIDE_ZLEN,
436         BSS_CMP_HIDE_NUL,
437 };
438
439 static int cmp_bss(struct cfg80211_bss *a,
440                    struct cfg80211_bss *b,
441                    enum bss_compare_mode mode)
442 {
443         const struct cfg80211_bss_ies *a_ies, *b_ies;
444         const u8 *ie1;
445         const u8 *ie2;
446         int i, r;
447
448         r = cmp_bss_core(a, b);
449         if (r)
450                 return r;
451
452         a_ies = rcu_access_pointer(a->ies);
453         if (!a_ies)
454                 return -1;
455         b_ies = rcu_access_pointer(b->ies);
456         if (!b_ies)
457                 return 1;
458
459         ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
460         ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
461
462         if (!ie1 && !ie2)
463                 return 0;
464
465         /*
466          * Note that with "hide_ssid", the function returns a match if
467          * the already-present BSS ("b") is a hidden SSID beacon for
468          * the new BSS ("a").
469          */
470
471         /* sort missing IE before (left of) present IE */
472         if (!ie1)
473                 return -1;
474         if (!ie2)
475                 return 1;
476
477         switch (mode) {
478         case BSS_CMP_HIDE_ZLEN:
479                 /*
480                  * In ZLEN mode we assume the BSS entry we're
481                  * looking for has a zero-length SSID. So if
482                  * the one we're looking at right now has that,
483                  * return 0. Otherwise, return the difference
484                  * in length, but since we're looking for the
485                  * 0-length it's really equivalent to returning
486                  * the length of the one we're looking at.
487                  *
488                  * No content comparison is needed as we assume
489                  * the content length is zero.
490                  */
491                 return ie2[1];
492         case BSS_CMP_REGULAR:
493         default:
494                 /* sort by length first, then by contents */
495                 if (ie1[1] != ie2[1])
496                         return ie2[1] - ie1[1];
497                 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
498         case BSS_CMP_HIDE_NUL:
499                 if (ie1[1] != ie2[1])
500                         return ie2[1] - ie1[1];
501                 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */
502                 for (i = 0; i < ie2[1]; i++)
503                         if (ie2[i + 2])
504                                 return -1;
505                 return 0;
506         }
507 }
508
509 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
510                                       struct ieee80211_channel *channel,
511                                       const u8 *bssid,
512                                       const u8 *ssid, size_t ssid_len,
513                                       u16 capa_mask, u16 capa_val)
514 {
515         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
516         struct cfg80211_internal_bss *bss, *res = NULL;
517         unsigned long now = jiffies;
518
519         trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, capa_mask,
520                                capa_val);
521
522         spin_lock_bh(&dev->bss_lock);
523
524         list_for_each_entry(bss, &dev->bss_list, list) {
525                 if ((bss->pub.capability & capa_mask) != capa_val)
526                         continue;
527                 if (channel && bss->pub.channel != channel)
528                         continue;
529                 /* Don't get expired BSS structs */
530                 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
531                     !atomic_read(&bss->hold))
532                         continue;
533                 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
534                         res = bss;
535                         kref_get(&res->ref);
536                         break;
537                 }
538         }
539
540         spin_unlock_bh(&dev->bss_lock);
541         if (!res)
542                 return NULL;
543         trace_cfg80211_return_bss(&res->pub);
544         return &res->pub;
545 }
546 EXPORT_SYMBOL(cfg80211_get_bss);
547
548 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
549                                        struct ieee80211_channel *channel,
550                                        const u8 *meshid, size_t meshidlen,
551                                        const u8 *meshcfg)
552 {
553         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
554         struct cfg80211_internal_bss *bss, *res = NULL;
555
556         spin_lock_bh(&dev->bss_lock);
557
558         list_for_each_entry(bss, &dev->bss_list, list) {
559                 if (channel && bss->pub.channel != channel)
560                         continue;
561                 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
562                         res = bss;
563                         kref_get(&res->ref);
564                         break;
565                 }
566         }
567
568         spin_unlock_bh(&dev->bss_lock);
569         if (!res)
570                 return NULL;
571         return &res->pub;
572 }
573 EXPORT_SYMBOL(cfg80211_get_mesh);
574
575
576 static void rb_insert_bss(struct cfg80211_registered_device *dev,
577                           struct cfg80211_internal_bss *bss)
578 {
579         struct rb_node **p = &dev->bss_tree.rb_node;
580         struct rb_node *parent = NULL;
581         struct cfg80211_internal_bss *tbss;
582         int cmp;
583
584         while (*p) {
585                 parent = *p;
586                 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
587
588                 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR);
589
590                 if (WARN_ON(!cmp)) {
591                         /* will sort of leak this BSS */
592                         return;
593                 }
594
595                 if (cmp < 0)
596                         p = &(*p)->rb_left;
597                 else
598                         p = &(*p)->rb_right;
599         }
600
601         rb_link_node(&bss->rbn, parent, p);
602         rb_insert_color(&bss->rbn, &dev->bss_tree);
603 }
604
605 static struct cfg80211_internal_bss *
606 rb_find_bss(struct cfg80211_registered_device *dev,
607             struct cfg80211_internal_bss *res,
608             enum bss_compare_mode mode)
609 {
610         struct rb_node *n = dev->bss_tree.rb_node;
611         struct cfg80211_internal_bss *bss;
612         int r;
613
614         while (n) {
615                 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
616                 r = cmp_bss(&res->pub, &bss->pub, mode);
617
618                 if (r == 0)
619                         return bss;
620                 else if (r < 0)
621                         n = n->rb_left;
622                 else
623                         n = n->rb_right;
624         }
625
626         return NULL;
627 }
628
629 static void
630 copy_hidden_ies(struct cfg80211_internal_bss *res,
631                 struct cfg80211_internal_bss *hidden)
632 {
633         const struct cfg80211_bss_ies *ies;
634
635         if (rcu_access_pointer(res->pub.beacon_ies))
636                 return;
637
638         ies = rcu_access_pointer(hidden->pub.beacon_ies);
639         if (WARN_ON(!ies))
640                 return;
641
642         ies = kmemdup(ies, sizeof(*ies) + ies->len, GFP_ATOMIC);
643         if (unlikely(!ies))
644                 return;
645         rcu_assign_pointer(res->pub.beacon_ies, ies);
646 }
647
648 static struct cfg80211_internal_bss *
649 cfg80211_bss_update(struct cfg80211_registered_device *dev,
650                     struct cfg80211_internal_bss *tmp)
651 {
652         struct cfg80211_internal_bss *found = NULL;
653
654         if (WARN_ON(!tmp->pub.channel))
655                 return NULL;
656
657         tmp->ts = jiffies;
658
659         spin_lock_bh(&dev->bss_lock);
660
661         if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
662                 spin_unlock_bh(&dev->bss_lock);
663                 return NULL;
664         }
665
666         found = rb_find_bss(dev, tmp, BSS_CMP_REGULAR);
667
668         if (found) {
669                 found->pub.beacon_interval = tmp->pub.beacon_interval;
670                 found->pub.tsf = tmp->pub.tsf;
671                 found->pub.signal = tmp->pub.signal;
672                 found->pub.capability = tmp->pub.capability;
673                 found->ts = tmp->ts;
674
675                 /* Update IEs */
676                 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
677                         const struct cfg80211_bss_ies *old;
678
679                         old = rcu_access_pointer(found->pub.proberesp_ies);
680
681                         rcu_assign_pointer(found->pub.proberesp_ies,
682                                            tmp->pub.proberesp_ies);
683                         /* Override possible earlier Beacon frame IEs */
684                         rcu_assign_pointer(found->pub.ies,
685                                            tmp->pub.proberesp_ies);
686                         if (old)
687                                 kfree_rcu((struct cfg80211_bss_ies *)old,
688                                           rcu_head);
689                 } else if (rcu_access_pointer(tmp->pub.beacon_ies)) {
690                         const struct cfg80211_bss_ies *old, *ies;
691
692                         old = rcu_access_pointer(found->pub.beacon_ies);
693                         ies = rcu_access_pointer(found->pub.ies);
694
695                         rcu_assign_pointer(found->pub.beacon_ies,
696                                            tmp->pub.beacon_ies);
697
698                         /* Override IEs if they were from a beacon before */
699                         if (old == ies)
700                                 rcu_assign_pointer(found->pub.ies,
701                                                    tmp->pub.beacon_ies);
702
703                         if (old)
704                                 kfree_rcu((struct cfg80211_bss_ies *)old,
705                                           rcu_head);
706                 }
707         } else {
708                 struct cfg80211_internal_bss *new;
709                 struct cfg80211_internal_bss *hidden;
710                 struct cfg80211_bss_ies *ies;
711
712                 /* First check if the beacon is a probe response from
713                  * a hidden bss. If so, copy beacon ies (with nullified
714                  * ssid) into the probe response bss entry (with real ssid).
715                  * It is required basically for PSM implementation
716                  * (probe responses do not contain tim ie) */
717
718                 /* TODO: The code is not trying to update existing probe
719                  * response bss entries when beacon ies are
720                  * getting changed. */
721                 hidden = rb_find_bss(dev, tmp, BSS_CMP_HIDE_ZLEN);
722                 if (hidden) {
723                         copy_hidden_ies(tmp, hidden);
724                 } else {
725                         hidden = rb_find_bss(dev, tmp, BSS_CMP_HIDE_NUL);
726                         if (hidden)
727                                 copy_hidden_ies(tmp, hidden);
728                 }
729
730                 /*
731                  * create a copy -- the "res" variable that is passed in
732                  * is allocated on the stack since it's not needed in the
733                  * more common case of an update
734                  */
735                 new = kzalloc(sizeof(*new) + dev->wiphy.bss_priv_size,
736                               GFP_ATOMIC);
737                 if (!new) {
738                         ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
739                         if (ies)
740                                 kfree_rcu(ies, rcu_head);
741                         ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
742                         if (ies)
743                                 kfree_rcu(ies, rcu_head);
744                         spin_unlock_bh(&dev->bss_lock);
745                         return NULL;
746                 }
747                 memcpy(new, tmp, sizeof(*new));
748                 kref_init(&new->ref);
749                 list_add_tail(&new->list, &dev->bss_list);
750                 rb_insert_bss(dev, new);
751                 found = new;
752         }
753
754         dev->bss_generation++;
755         spin_unlock_bh(&dev->bss_lock);
756
757         kref_get(&found->ref);
758         return found;
759 }
760
761 static struct ieee80211_channel *
762 cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
763                          struct ieee80211_channel *channel)
764 {
765         const u8 *tmp;
766         u32 freq;
767         int channel_number = -1;
768
769         tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen);
770         if (tmp && tmp[1] == 1) {
771                 channel_number = tmp[2];
772         } else {
773                 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen);
774                 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) {
775                         struct ieee80211_ht_operation *htop = (void *)(tmp + 2);
776
777                         channel_number = htop->primary_chan;
778                 }
779         }
780
781         if (channel_number < 0)
782                 return channel;
783
784         freq = ieee80211_channel_to_frequency(channel_number, channel->band);
785         channel = ieee80211_get_channel(wiphy, freq);
786         if (!channel)
787                 return NULL;
788         if (channel->flags & IEEE80211_CHAN_DISABLED)
789                 return NULL;
790         return channel;
791 }
792
793 struct cfg80211_bss*
794 cfg80211_inform_bss(struct wiphy *wiphy,
795                     struct ieee80211_channel *channel,
796                     const u8 *bssid, u64 tsf, u16 capability,
797                     u16 beacon_interval, const u8 *ie, size_t ielen,
798                     s32 signal, gfp_t gfp)
799 {
800         struct cfg80211_bss_ies *ies;
801         struct cfg80211_internal_bss tmp = {}, *res;
802
803         if (WARN_ON(!wiphy))
804                 return NULL;
805
806         if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
807                         (signal < 0 || signal > 100)))
808                 return NULL;
809
810         channel = cfg80211_get_bss_channel(wiphy, ie, ielen, channel);
811         if (!channel)
812                 return NULL;
813
814         memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
815         tmp.pub.channel = channel;
816         tmp.pub.signal = signal;
817         tmp.pub.tsf = tsf;
818         tmp.pub.beacon_interval = beacon_interval;
819         tmp.pub.capability = capability;
820         /*
821          * Since we do not know here whether the IEs are from a Beacon or Probe
822          * Response frame, we need to pick one of the options and only use it
823          * with the driver that does not provide the full Beacon/Probe Response
824          * frame. Use Beacon frame pointer to avoid indicating that this should
825          * override the iies pointer should we have received an earlier
826          * indication of Probe Response data.
827          *
828          * The initial buffer for the IEs is allocated with the BSS entry and
829          * is located after the private area.
830          */
831         ies = kmalloc(sizeof(*ies) + ielen, gfp);
832         if (!ies)
833                 return NULL;
834         ies->len = ielen;
835         memcpy(ies->data, ie, ielen);
836
837         rcu_assign_pointer(tmp.pub.beacon_ies, ies);
838         rcu_assign_pointer(tmp.pub.ies, ies);
839
840         res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp);
841         if (!res)
842                 return NULL;
843
844         if (res->pub.capability & WLAN_CAPABILITY_ESS)
845                 regulatory_hint_found_beacon(wiphy, channel, gfp);
846
847         trace_cfg80211_return_bss(&res->pub);
848         /* cfg80211_bss_update gives us a referenced result */
849         return &res->pub;
850 }
851 EXPORT_SYMBOL(cfg80211_inform_bss);
852
853 struct cfg80211_bss *
854 cfg80211_inform_bss_frame(struct wiphy *wiphy,
855                           struct ieee80211_channel *channel,
856                           struct ieee80211_mgmt *mgmt, size_t len,
857                           s32 signal, gfp_t gfp)
858 {
859         struct cfg80211_internal_bss tmp = {}, *res;
860         struct cfg80211_bss_ies *ies;
861         size_t ielen = len - offsetof(struct ieee80211_mgmt,
862                                       u.probe_resp.variable);
863
864         BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
865                         offsetof(struct ieee80211_mgmt, u.beacon.variable));
866
867         trace_cfg80211_inform_bss_frame(wiphy, channel, mgmt, len, signal);
868
869         if (WARN_ON(!mgmt))
870                 return NULL;
871
872         if (WARN_ON(!wiphy))
873                 return NULL;
874
875         if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
876                     (signal < 0 || signal > 100)))
877                 return NULL;
878
879         if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
880                 return NULL;
881
882         channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable,
883                                            ielen, channel);
884         if (!channel)
885                 return NULL;
886
887         ies = kmalloc(sizeof(*ies) + ielen, gfp);
888         if (!ies)
889                 return NULL;
890         ies->len = ielen;
891         memcpy(ies->data, mgmt->u.probe_resp.variable, ielen);
892
893         if (ieee80211_is_probe_resp(mgmt->frame_control))
894                 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
895         else
896                 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
897         rcu_assign_pointer(tmp.pub.ies, ies);
898         
899         memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN);
900         tmp.pub.channel = channel;
901         tmp.pub.signal = signal;
902         tmp.pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
903         tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
904         tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
905
906         res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp);
907         if (!res)
908                 return NULL;
909
910         if (res->pub.capability & WLAN_CAPABILITY_ESS)
911                 regulatory_hint_found_beacon(wiphy, channel, gfp);
912
913         trace_cfg80211_return_bss(&res->pub);
914         /* cfg80211_bss_update gives us a referenced result */
915         return &res->pub;
916 }
917 EXPORT_SYMBOL(cfg80211_inform_bss_frame);
918
919 void cfg80211_ref_bss(struct cfg80211_bss *pub)
920 {
921         struct cfg80211_internal_bss *bss;
922
923         if (!pub)
924                 return;
925
926         bss = container_of(pub, struct cfg80211_internal_bss, pub);
927         kref_get(&bss->ref);
928 }
929 EXPORT_SYMBOL(cfg80211_ref_bss);
930
931 void cfg80211_put_bss(struct cfg80211_bss *pub)
932 {
933         struct cfg80211_internal_bss *bss;
934
935         if (!pub)
936                 return;
937
938         bss = container_of(pub, struct cfg80211_internal_bss, pub);
939         kref_put(&bss->ref, bss_release);
940 }
941 EXPORT_SYMBOL(cfg80211_put_bss);
942
943 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
944 {
945         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
946         struct cfg80211_internal_bss *bss;
947
948         if (WARN_ON(!pub))
949                 return;
950
951         bss = container_of(pub, struct cfg80211_internal_bss, pub);
952
953         spin_lock_bh(&dev->bss_lock);
954         if (!list_empty(&bss->list)) {
955                 __cfg80211_unlink_bss(dev, bss);
956                 dev->bss_generation++;
957         }
958         spin_unlock_bh(&dev->bss_lock);
959 }
960 EXPORT_SYMBOL(cfg80211_unlink_bss);
961
962 #ifdef CONFIG_CFG80211_WEXT
963 int cfg80211_wext_siwscan(struct net_device *dev,
964                           struct iw_request_info *info,
965                           union iwreq_data *wrqu, char *extra)
966 {
967         struct cfg80211_registered_device *rdev;
968         struct wiphy *wiphy;
969         struct iw_scan_req *wreq = NULL;
970         struct cfg80211_scan_request *creq = NULL;
971         int i, err, n_channels = 0;
972         enum ieee80211_band band;
973
974         if (!netif_running(dev))
975                 return -ENETDOWN;
976
977         if (wrqu->data.length == sizeof(struct iw_scan_req))
978                 wreq = (struct iw_scan_req *)extra;
979
980         rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
981
982         if (IS_ERR(rdev))
983                 return PTR_ERR(rdev);
984
985         if (rdev->scan_req) {
986                 err = -EBUSY;
987                 goto out;
988         }
989
990         wiphy = &rdev->wiphy;
991
992         /* Determine number of channels, needed to allocate creq */
993         if (wreq && wreq->num_channels)
994                 n_channels = wreq->num_channels;
995         else {
996                 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
997                         if (wiphy->bands[band])
998                                 n_channels += wiphy->bands[band]->n_channels;
999         }
1000
1001         creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
1002                        n_channels * sizeof(void *),
1003                        GFP_ATOMIC);
1004         if (!creq) {
1005                 err = -ENOMEM;
1006                 goto out;
1007         }
1008
1009         creq->wiphy = wiphy;
1010         creq->wdev = dev->ieee80211_ptr;
1011         /* SSIDs come after channels */
1012         creq->ssids = (void *)&creq->channels[n_channels];
1013         creq->n_channels = n_channels;
1014         creq->n_ssids = 1;
1015         creq->scan_start = jiffies;
1016
1017         /* translate "Scan on frequencies" request */
1018         i = 0;
1019         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1020                 int j;
1021
1022                 if (!wiphy->bands[band])
1023                         continue;
1024
1025                 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
1026                         /* ignore disabled channels */
1027                         if (wiphy->bands[band]->channels[j].flags &
1028                                                 IEEE80211_CHAN_DISABLED)
1029                                 continue;
1030
1031                         /* If we have a wireless request structure and the
1032                          * wireless request specifies frequencies, then search
1033                          * for the matching hardware channel.
1034                          */
1035                         if (wreq && wreq->num_channels) {
1036                                 int k;
1037                                 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
1038                                 for (k = 0; k < wreq->num_channels; k++) {
1039                                         int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]);
1040                                         if (wext_freq == wiphy_freq)
1041                                                 goto wext_freq_found;
1042                                 }
1043                                 goto wext_freq_not_found;
1044                         }
1045
1046                 wext_freq_found:
1047                         creq->channels[i] = &wiphy->bands[band]->channels[j];
1048                         i++;
1049                 wext_freq_not_found: ;
1050                 }
1051         }
1052         /* No channels found? */
1053         if (!i) {
1054                 err = -EINVAL;
1055                 goto out;
1056         }
1057
1058         /* Set real number of channels specified in creq->channels[] */
1059         creq->n_channels = i;
1060
1061         /* translate "Scan for SSID" request */
1062         if (wreq) {
1063                 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
1064                         if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
1065                                 err = -EINVAL;
1066                                 goto out;
1067                         }
1068                         memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
1069                         creq->ssids[0].ssid_len = wreq->essid_len;
1070                 }
1071                 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
1072                         creq->n_ssids = 0;
1073         }
1074
1075         for (i = 0; i < IEEE80211_NUM_BANDS; i++)
1076                 if (wiphy->bands[i])
1077                         creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
1078
1079         rdev->scan_req = creq;
1080         err = rdev_scan(rdev, creq);
1081         if (err) {
1082                 rdev->scan_req = NULL;
1083                 /* creq will be freed below */
1084         } else {
1085                 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
1086                 /* creq now owned by driver */
1087                 creq = NULL;
1088                 dev_hold(dev);
1089         }
1090  out:
1091         kfree(creq);
1092         cfg80211_unlock_rdev(rdev);
1093         return err;
1094 }
1095 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
1096
1097 static void ieee80211_scan_add_ies(struct iw_request_info *info,
1098                                    const struct cfg80211_bss_ies *ies,
1099                                    char **current_ev, char *end_buf)
1100 {
1101         const u8 *pos, *end, *next;
1102         struct iw_event iwe;
1103
1104         if (!ies)
1105                 return;
1106
1107         /*
1108          * If needed, fragment the IEs buffer (at IE boundaries) into short
1109          * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
1110          */
1111         pos = ies->data;
1112         end = pos + ies->len;
1113
1114         while (end - pos > IW_GENERIC_IE_MAX) {
1115                 next = pos + 2 + pos[1];
1116                 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
1117                         next = next + 2 + next[1];
1118
1119                 memset(&iwe, 0, sizeof(iwe));
1120                 iwe.cmd = IWEVGENIE;
1121                 iwe.u.data.length = next - pos;
1122                 *current_ev = iwe_stream_add_point(info, *current_ev,
1123                                                    end_buf, &iwe,
1124                                                    (void *)pos);
1125
1126                 pos = next;
1127         }
1128
1129         if (end > pos) {
1130                 memset(&iwe, 0, sizeof(iwe));
1131                 iwe.cmd = IWEVGENIE;
1132                 iwe.u.data.length = end - pos;
1133                 *current_ev = iwe_stream_add_point(info, *current_ev,
1134                                                    end_buf, &iwe,
1135                                                    (void *)pos);
1136         }
1137 }
1138
1139 static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
1140 {
1141         unsigned long end = jiffies;
1142
1143         if (end >= start)
1144                 return jiffies_to_msecs(end - start);
1145
1146         return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
1147 }
1148
1149 static char *
1150 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
1151               struct cfg80211_internal_bss *bss, char *current_ev,
1152               char *end_buf)
1153 {
1154         const struct cfg80211_bss_ies *ies;
1155         struct iw_event iwe;
1156         const u8 *ie;
1157         u8 *buf, *cfg, *p;
1158         int rem, i, sig;
1159         bool ismesh = false;
1160
1161         memset(&iwe, 0, sizeof(iwe));
1162         iwe.cmd = SIOCGIWAP;
1163         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1164         memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
1165         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1166                                           IW_EV_ADDR_LEN);
1167
1168         memset(&iwe, 0, sizeof(iwe));
1169         iwe.cmd = SIOCGIWFREQ;
1170         iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
1171         iwe.u.freq.e = 0;
1172         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1173                                           IW_EV_FREQ_LEN);
1174
1175         memset(&iwe, 0, sizeof(iwe));
1176         iwe.cmd = SIOCGIWFREQ;
1177         iwe.u.freq.m = bss->pub.channel->center_freq;
1178         iwe.u.freq.e = 6;
1179         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1180                                           IW_EV_FREQ_LEN);
1181
1182         if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
1183                 memset(&iwe, 0, sizeof(iwe));
1184                 iwe.cmd = IWEVQUAL;
1185                 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
1186                                      IW_QUAL_NOISE_INVALID |
1187                                      IW_QUAL_QUAL_UPDATED;
1188                 switch (wiphy->signal_type) {
1189                 case CFG80211_SIGNAL_TYPE_MBM:
1190                         sig = bss->pub.signal / 100;
1191                         iwe.u.qual.level = sig;
1192                         iwe.u.qual.updated |= IW_QUAL_DBM;
1193                         if (sig < -110)         /* rather bad */
1194                                 sig = -110;
1195                         else if (sig > -40)     /* perfect */
1196                                 sig = -40;
1197                         /* will give a range of 0 .. 70 */
1198                         iwe.u.qual.qual = sig + 110;
1199                         break;
1200                 case CFG80211_SIGNAL_TYPE_UNSPEC:
1201                         iwe.u.qual.level = bss->pub.signal;
1202                         /* will give range 0 .. 100 */
1203                         iwe.u.qual.qual = bss->pub.signal;
1204                         break;
1205                 default:
1206                         /* not reached */
1207                         break;
1208                 }
1209                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1210                                                   &iwe, IW_EV_QUAL_LEN);
1211         }
1212
1213         memset(&iwe, 0, sizeof(iwe));
1214         iwe.cmd = SIOCGIWENCODE;
1215         if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
1216                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1217         else
1218                 iwe.u.data.flags = IW_ENCODE_DISABLED;
1219         iwe.u.data.length = 0;
1220         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1221                                           &iwe, "");
1222
1223         rcu_read_lock();
1224         ies = rcu_dereference(bss->pub.ies);
1225         if (ies) {
1226                 rem = ies->len;
1227                 ie = ies->data;
1228         } else {
1229                 rem = 0;
1230                 ie = NULL;
1231         }
1232
1233         while (ies && rem >= 2) {
1234                 /* invalid data */
1235                 if (ie[1] > rem - 2)
1236                         break;
1237
1238                 switch (ie[0]) {
1239                 case WLAN_EID_SSID:
1240                         memset(&iwe, 0, sizeof(iwe));
1241                         iwe.cmd = SIOCGIWESSID;
1242                         iwe.u.data.length = ie[1];
1243                         iwe.u.data.flags = 1;
1244                         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1245                                                           &iwe, (u8 *)ie + 2);
1246                         break;
1247                 case WLAN_EID_MESH_ID:
1248                         memset(&iwe, 0, sizeof(iwe));
1249                         iwe.cmd = SIOCGIWESSID;
1250                         iwe.u.data.length = ie[1];
1251                         iwe.u.data.flags = 1;
1252                         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1253                                                           &iwe, (u8 *)ie + 2);
1254                         break;
1255                 case WLAN_EID_MESH_CONFIG:
1256                         ismesh = true;
1257                         if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
1258                                 break;
1259                         buf = kmalloc(50, GFP_ATOMIC);
1260                         if (!buf)
1261                                 break;
1262                         cfg = (u8 *)ie + 2;
1263                         memset(&iwe, 0, sizeof(iwe));
1264                         iwe.cmd = IWEVCUSTOM;
1265                         sprintf(buf, "Mesh Network Path Selection Protocol ID: "
1266                                 "0x%02X", cfg[0]);
1267                         iwe.u.data.length = strlen(buf);
1268                         current_ev = iwe_stream_add_point(info, current_ev,
1269                                                           end_buf,
1270                                                           &iwe, buf);
1271                         sprintf(buf, "Path Selection Metric ID: 0x%02X",
1272                                 cfg[1]);
1273                         iwe.u.data.length = strlen(buf);
1274                         current_ev = iwe_stream_add_point(info, current_ev,
1275                                                           end_buf,
1276                                                           &iwe, buf);
1277                         sprintf(buf, "Congestion Control Mode ID: 0x%02X",
1278                                 cfg[2]);
1279                         iwe.u.data.length = strlen(buf);
1280                         current_ev = iwe_stream_add_point(info, current_ev,
1281                                                           end_buf,
1282                                                           &iwe, buf);
1283                         sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
1284                         iwe.u.data.length = strlen(buf);
1285                         current_ev = iwe_stream_add_point(info, current_ev,
1286                                                           end_buf,
1287                                                           &iwe, buf);
1288                         sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
1289                         iwe.u.data.length = strlen(buf);
1290                         current_ev = iwe_stream_add_point(info, current_ev,
1291                                                           end_buf,
1292                                                           &iwe, buf);
1293                         sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
1294                         iwe.u.data.length = strlen(buf);
1295                         current_ev = iwe_stream_add_point(info, current_ev,
1296                                                           end_buf,
1297                                                           &iwe, buf);
1298                         sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
1299                         iwe.u.data.length = strlen(buf);
1300                         current_ev = iwe_stream_add_point(info, current_ev,
1301                                                           end_buf,
1302                                                           &iwe, buf);
1303                         kfree(buf);
1304                         break;
1305                 case WLAN_EID_SUPP_RATES:
1306                 case WLAN_EID_EXT_SUPP_RATES:
1307                         /* display all supported rates in readable format */
1308                         p = current_ev + iwe_stream_lcp_len(info);
1309
1310                         memset(&iwe, 0, sizeof(iwe));
1311                         iwe.cmd = SIOCGIWRATE;
1312                         /* Those two flags are ignored... */
1313                         iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
1314
1315                         for (i = 0; i < ie[1]; i++) {
1316                                 iwe.u.bitrate.value =
1317                                         ((ie[i + 2] & 0x7f) * 500000);
1318                                 p = iwe_stream_add_value(info, current_ev, p,
1319                                                 end_buf, &iwe, IW_EV_PARAM_LEN);
1320                         }
1321                         current_ev = p;
1322                         break;
1323                 }
1324                 rem -= ie[1] + 2;
1325                 ie += ie[1] + 2;
1326         }
1327
1328         if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
1329             ismesh) {
1330                 memset(&iwe, 0, sizeof(iwe));
1331                 iwe.cmd = SIOCGIWMODE;
1332                 if (ismesh)
1333                         iwe.u.mode = IW_MODE_MESH;
1334                 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
1335                         iwe.u.mode = IW_MODE_MASTER;
1336                 else
1337                         iwe.u.mode = IW_MODE_ADHOC;
1338                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1339                                                   &iwe, IW_EV_UINT_LEN);
1340         }
1341
1342         buf = kmalloc(30, GFP_ATOMIC);
1343         if (buf) {
1344                 memset(&iwe, 0, sizeof(iwe));
1345                 iwe.cmd = IWEVCUSTOM;
1346                 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
1347                 iwe.u.data.length = strlen(buf);
1348                 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1349                                                   &iwe, buf);
1350                 memset(&iwe, 0, sizeof(iwe));
1351                 iwe.cmd = IWEVCUSTOM;
1352                 sprintf(buf, " Last beacon: %ums ago",
1353                         elapsed_jiffies_msecs(bss->ts));
1354                 iwe.u.data.length = strlen(buf);
1355                 current_ev = iwe_stream_add_point(info, current_ev,
1356                                                   end_buf, &iwe, buf);
1357                 kfree(buf);
1358         }
1359
1360         ieee80211_scan_add_ies(info, ies, &current_ev, end_buf);
1361         rcu_read_unlock();
1362
1363         return current_ev;
1364 }
1365
1366
1367 static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
1368                                   struct iw_request_info *info,
1369                                   char *buf, size_t len)
1370 {
1371         char *current_ev = buf;
1372         char *end_buf = buf + len;
1373         struct cfg80211_internal_bss *bss;
1374
1375         spin_lock_bh(&dev->bss_lock);
1376         cfg80211_bss_expire(dev);
1377
1378         list_for_each_entry(bss, &dev->bss_list, list) {
1379                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
1380                         spin_unlock_bh(&dev->bss_lock);
1381                         return -E2BIG;
1382                 }
1383                 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
1384                                            current_ev, end_buf);
1385         }
1386         spin_unlock_bh(&dev->bss_lock);
1387         return current_ev - buf;
1388 }
1389
1390
1391 int cfg80211_wext_giwscan(struct net_device *dev,
1392                           struct iw_request_info *info,
1393                           struct iw_point *data, char *extra)
1394 {
1395         struct cfg80211_registered_device *rdev;
1396         int res;
1397
1398         if (!netif_running(dev))
1399                 return -ENETDOWN;
1400
1401         rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1402
1403         if (IS_ERR(rdev))
1404                 return PTR_ERR(rdev);
1405
1406         if (rdev->scan_req) {
1407                 res = -EAGAIN;
1408                 goto out;
1409         }
1410
1411         res = ieee80211_scan_results(rdev, info, extra, data->length);
1412         data->length = 0;
1413         if (res >= 0) {
1414                 data->length = res;
1415                 res = 0;
1416         }
1417
1418  out:
1419         cfg80211_unlock_rdev(rdev);
1420         return res;
1421 }
1422 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);
1423 #endif