can: c_can: Set reserved bit in IFx_MASK2 to 1 on write
[~shefty/rdma-dev.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         if (bss->pub.free_priv)
35                 bss->pub.free_priv(&bss->pub);
36
37         ies = (void *)rcu_access_pointer(bss->pub.beacon_ies);
38         if (ies)
39                 kfree_rcu(ies, rcu_head);
40         ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies);
41         if (ies)
42                 kfree_rcu(ies, rcu_head);
43
44         kfree(bss);
45 }
46
47 /* must hold dev->bss_lock! */
48 static void __cfg80211_unlink_bss(struct cfg80211_registered_device *dev,
49                                   struct cfg80211_internal_bss *bss)
50 {
51         list_del_init(&bss->list);
52         rb_erase(&bss->rbn, &dev->bss_tree);
53         kref_put(&bss->ref, bss_release);
54 }
55
56 /* must hold dev->bss_lock! */
57 static void __cfg80211_bss_expire(struct cfg80211_registered_device *dev,
58                                   unsigned long expire_time)
59 {
60         struct cfg80211_internal_bss *bss, *tmp;
61         bool expired = false;
62
63         list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
64                 if (atomic_read(&bss->hold))
65                         continue;
66                 if (!time_after(expire_time, bss->ts))
67                         continue;
68
69                 __cfg80211_unlink_bss(dev, bss);
70                 expired = true;
71         }
72
73         if (expired)
74                 dev->bss_generation++;
75 }
76
77 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak)
78 {
79         struct cfg80211_scan_request *request;
80         struct wireless_dev *wdev;
81 #ifdef CONFIG_CFG80211_WEXT
82         union iwreq_data wrqu;
83 #endif
84
85         ASSERT_RDEV_LOCK(rdev);
86
87         request = rdev->scan_req;
88
89         if (!request)
90                 return;
91
92         wdev = request->wdev;
93
94         /*
95          * This must be before sending the other events!
96          * Otherwise, wpa_supplicant gets completely confused with
97          * wext events.
98          */
99         if (wdev->netdev)
100                 cfg80211_sme_scan_done(wdev->netdev);
101
102         if (request->aborted) {
103                 nl80211_send_scan_aborted(rdev, wdev);
104         } else {
105                 if (request->flags & NL80211_SCAN_FLAG_FLUSH) {
106                         /* flush entries from previous scans */
107                         spin_lock_bh(&rdev->bss_lock);
108                         __cfg80211_bss_expire(rdev, request->scan_start);
109                         spin_unlock_bh(&rdev->bss_lock);
110                 }
111                 nl80211_send_scan_done(rdev, wdev);
112         }
113
114 #ifdef CONFIG_CFG80211_WEXT
115         if (wdev->netdev && !request->aborted) {
116                 memset(&wrqu, 0, sizeof(wrqu));
117
118                 wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
119         }
120 #endif
121
122         if (wdev->netdev)
123                 dev_put(wdev->netdev);
124
125         rdev->scan_req = NULL;
126
127         /*
128          * OK. If this is invoked with "leak" then we can't
129          * free this ... but we've cleaned it up anyway. The
130          * driver failed to call the scan_done callback, so
131          * all bets are off, it might still be trying to use
132          * the scan request or not ... if it accesses the dev
133          * in there (it shouldn't anyway) then it may crash.
134          */
135         if (!leak)
136                 kfree(request);
137 }
138
139 void __cfg80211_scan_done(struct work_struct *wk)
140 {
141         struct cfg80211_registered_device *rdev;
142
143         rdev = container_of(wk, struct cfg80211_registered_device,
144                             scan_done_wk);
145
146         cfg80211_lock_rdev(rdev);
147         ___cfg80211_scan_done(rdev, false);
148         cfg80211_unlock_rdev(rdev);
149 }
150
151 void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
152 {
153         trace_cfg80211_scan_done(request, aborted);
154         WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);
155
156         request->aborted = aborted;
157         queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk);
158 }
159 EXPORT_SYMBOL(cfg80211_scan_done);
160
161 void __cfg80211_sched_scan_results(struct work_struct *wk)
162 {
163         struct cfg80211_registered_device *rdev;
164         struct cfg80211_sched_scan_request *request;
165
166         rdev = container_of(wk, struct cfg80211_registered_device,
167                             sched_scan_results_wk);
168
169         request = rdev->sched_scan_req;
170
171         mutex_lock(&rdev->sched_scan_mtx);
172
173         /* we don't have sched_scan_req anymore if the scan is stopping */
174         if (request) {
175                 if (request->flags & NL80211_SCAN_FLAG_FLUSH) {
176                         /* flush entries from previous scans */
177                         spin_lock_bh(&rdev->bss_lock);
178                         __cfg80211_bss_expire(rdev, request->scan_start);
179                         spin_unlock_bh(&rdev->bss_lock);
180                         request->scan_start =
181                                 jiffies + msecs_to_jiffies(request->interval);
182                 }
183                 nl80211_send_sched_scan_results(rdev, request->dev);
184         }
185
186         mutex_unlock(&rdev->sched_scan_mtx);
187 }
188
189 void cfg80211_sched_scan_results(struct wiphy *wiphy)
190 {
191         trace_cfg80211_sched_scan_results(wiphy);
192         /* ignore if we're not scanning */
193         if (wiphy_to_dev(wiphy)->sched_scan_req)
194                 queue_work(cfg80211_wq,
195                            &wiphy_to_dev(wiphy)->sched_scan_results_wk);
196 }
197 EXPORT_SYMBOL(cfg80211_sched_scan_results);
198
199 void cfg80211_sched_scan_stopped(struct wiphy *wiphy)
200 {
201         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
202
203         trace_cfg80211_sched_scan_stopped(wiphy);
204
205         mutex_lock(&rdev->sched_scan_mtx);
206         __cfg80211_stop_sched_scan(rdev, true);
207         mutex_unlock(&rdev->sched_scan_mtx);
208 }
209 EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
210
211 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
212                                bool driver_initiated)
213 {
214         struct net_device *dev;
215
216         lockdep_assert_held(&rdev->sched_scan_mtx);
217
218         if (!rdev->sched_scan_req)
219                 return -ENOENT;
220
221         dev = rdev->sched_scan_req->dev;
222
223         if (!driver_initiated) {
224                 int err = rdev_sched_scan_stop(rdev, dev);
225                 if (err)
226                         return err;
227         }
228
229         nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED);
230
231         kfree(rdev->sched_scan_req);
232         rdev->sched_scan_req = NULL;
233
234         return 0;
235 }
236
237 /* must hold dev->bss_lock! */
238 void cfg80211_bss_age(struct cfg80211_registered_device *dev,
239                       unsigned long age_secs)
240 {
241         struct cfg80211_internal_bss *bss;
242         unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
243
244         list_for_each_entry(bss, &dev->bss_list, list)
245                 bss->ts -= age_jiffies;
246 }
247
248 void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
249 {
250         __cfg80211_bss_expire(dev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
251 }
252
253 const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len)
254 {
255         while (len > 2 && ies[0] != eid) {
256                 len -= ies[1] + 2;
257                 ies += ies[1] + 2;
258         }
259         if (len < 2)
260                 return NULL;
261         if (len < 2 + ies[1])
262                 return NULL;
263         return ies;
264 }
265 EXPORT_SYMBOL(cfg80211_find_ie);
266
267 const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type,
268                                   const u8 *ies, int len)
269 {
270         struct ieee80211_vendor_ie *ie;
271         const u8 *pos = ies, *end = ies + len;
272         int ie_oui;
273
274         while (pos < end) {
275                 pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos,
276                                        end - pos);
277                 if (!pos)
278                         return NULL;
279
280                 if (end - pos < sizeof(*ie))
281                         return NULL;
282
283                 ie = (struct ieee80211_vendor_ie *)pos;
284                 ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2];
285                 if (ie_oui == oui && ie->oui_type == oui_type)
286                         return pos;
287
288                 pos += 2 + ie->len;
289         }
290         return NULL;
291 }
292 EXPORT_SYMBOL(cfg80211_find_vendor_ie);
293
294 static int cmp_ies(u8 num, const u8 *ies1, int len1, const u8 *ies2, int len2)
295 {
296         const u8 *ie1 = cfg80211_find_ie(num, ies1, len1);
297         const u8 *ie2 = cfg80211_find_ie(num, ies2, len2);
298
299         /* equal if both missing */
300         if (!ie1 && !ie2)
301                 return 0;
302         /* sort missing IE before (left of) present IE */
303         if (!ie1)
304                 return -1;
305         if (!ie2)
306                 return 1;
307
308         /* sort by length first, then by contents */
309         if (ie1[1] != ie2[1])
310                 return ie2[1] - ie1[1];
311         return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
312 }
313
314 static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
315                    const u8 *ssid, size_t ssid_len)
316 {
317         const struct cfg80211_bss_ies *ies;
318         const u8 *ssidie;
319
320         if (bssid && !ether_addr_equal(a->bssid, bssid))
321                 return false;
322
323         if (!ssid)
324                 return true;
325
326         ies = rcu_access_pointer(a->ies);
327         if (!ies)
328                 return false;
329         ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
330         if (!ssidie)
331                 return false;
332         if (ssidie[1] != ssid_len)
333                 return false;
334         return memcmp(ssidie + 2, ssid, ssid_len) == 0;
335 }
336
337 static bool is_mesh_bss(struct cfg80211_bss *a)
338 {
339         const struct cfg80211_bss_ies *ies;
340         const u8 *ie;
341
342         if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
343                 return false;
344
345         ies = rcu_access_pointer(a->ies);
346         if (!ies)
347                 return false;
348
349         ie = cfg80211_find_ie(WLAN_EID_MESH_ID, ies->data, ies->len);
350         if (!ie)
351                 return false;
352
353         ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, ies->data, ies->len);
354         if (!ie)
355                 return false;
356
357         return true;
358 }
359
360 static bool is_mesh(struct cfg80211_bss *a,
361                     const u8 *meshid, size_t meshidlen,
362                     const u8 *meshcfg)
363 {
364         const struct cfg80211_bss_ies *ies;
365         const u8 *ie;
366
367         if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
368                 return false;
369
370         ies = rcu_access_pointer(a->ies);
371         if (!ies)
372                 return false;
373
374         ie = cfg80211_find_ie(WLAN_EID_MESH_ID, ies->data, ies->len);
375         if (!ie)
376                 return false;
377         if (ie[1] != meshidlen)
378                 return false;
379         if (memcmp(ie + 2, meshid, meshidlen))
380                 return false;
381
382         ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG, ies->data, ies->len);
383         if (!ie)
384                 return false;
385         if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
386                 return false;
387
388         /*
389          * Ignore mesh capability (last two bytes of the IE) when
390          * comparing since that may differ between stations taking
391          * part in the same mesh.
392          */
393         return memcmp(ie + 2, meshcfg,
394                       sizeof(struct ieee80211_meshconf_ie) - 2) == 0;
395 }
396
397 static int cmp_bss_core(struct cfg80211_bss *a, struct cfg80211_bss *b)
398 {
399         const struct cfg80211_bss_ies *a_ies, *b_ies;
400         int r;
401
402         if (a->channel != b->channel)
403                 return b->channel->center_freq - a->channel->center_freq;
404
405         if (is_mesh_bss(a) && is_mesh_bss(b)) {
406                 a_ies = rcu_access_pointer(a->ies);
407                 if (!a_ies)
408                         return -1;
409                 b_ies = rcu_access_pointer(b->ies);
410                 if (!b_ies)
411                         return 1;
412
413                 r = cmp_ies(WLAN_EID_MESH_ID,
414                             a_ies->data, a_ies->len,
415                             b_ies->data, b_ies->len);
416                 if (r)
417                         return r;
418                 return cmp_ies(WLAN_EID_MESH_CONFIG,
419                                a_ies->data, a_ies->len,
420                                b_ies->data, b_ies->len);
421         }
422
423         /*
424          * we can't use compare_ether_addr here since we need a < > operator.
425          * The binary return value of compare_ether_addr isn't enough
426          */
427         return memcmp(a->bssid, b->bssid, sizeof(a->bssid));
428 }
429
430 static int cmp_bss(struct cfg80211_bss *a,
431                    struct cfg80211_bss *b)
432 {
433         const struct cfg80211_bss_ies *a_ies, *b_ies;
434         int r;
435
436         r = cmp_bss_core(a, b);
437         if (r)
438                 return r;
439
440         a_ies = rcu_access_pointer(a->ies);
441         if (!a_ies)
442                 return -1;
443         b_ies = rcu_access_pointer(b->ies);
444         if (!b_ies)
445                 return 1;
446
447         return cmp_ies(WLAN_EID_SSID,
448                        a_ies->data, a_ies->len,
449                        b_ies->data, b_ies->len);
450 }
451
452 static int cmp_hidden_bss(struct cfg80211_bss *a, struct cfg80211_bss *b)
453 {
454         const struct cfg80211_bss_ies *a_ies, *b_ies;
455         const u8 *ie1;
456         const u8 *ie2;
457         int i;
458         int r;
459
460         r = cmp_bss_core(a, b);
461         if (r)
462                 return r;
463
464         a_ies = rcu_access_pointer(a->ies);
465         if (!a_ies)
466                 return -1;
467         b_ies = rcu_access_pointer(b->ies);
468         if (!b_ies)
469                 return 1;
470
471         ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
472         ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
473
474         /*
475          * Key comparator must use same algorithm in any rb-tree
476          * search function (order is important), otherwise ordering
477          * of items in the tree is broken and search gives incorrect
478          * results. This code uses same order as cmp_ies() does.
479          *
480          * Note that due to the differring behaviour with hidden SSIDs
481          * this function only works when "b" is the tree element and
482          * "a" is the key we're looking for.
483          */
484
485         /* sort missing IE before (left of) present IE */
486         if (!ie1)
487                 return -1;
488         if (!ie2)
489                 return 1;
490
491         /* zero-size SSID is used as an indication of the hidden bss */
492         if (!ie2[1])
493                 return 0;
494
495         /* sort by length first, then by contents */
496         if (ie1[1] != ie2[1])
497                 return ie2[1] - ie1[1];
498
499         /*
500          * zeroed SSID ie is another indication of a hidden bss;
501          * if it isn't zeroed just return the regular sort value
502          * to find the next candidate
503          */
504         for (i = 0; i < ie2[1]; i++)
505                 if (ie2[i + 2])
506                         return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
507
508         return 0;
509 }
510
511 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
512                                       struct ieee80211_channel *channel,
513                                       const u8 *bssid,
514                                       const u8 *ssid, size_t ssid_len,
515                                       u16 capa_mask, u16 capa_val)
516 {
517         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
518         struct cfg80211_internal_bss *bss, *res = NULL;
519         unsigned long now = jiffies;
520
521         trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, capa_mask,
522                                capa_val);
523
524         spin_lock_bh(&dev->bss_lock);
525
526         list_for_each_entry(bss, &dev->bss_list, list) {
527                 if ((bss->pub.capability & capa_mask) != capa_val)
528                         continue;
529                 if (channel && bss->pub.channel != channel)
530                         continue;
531                 /* Don't get expired BSS structs */
532                 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
533                     !atomic_read(&bss->hold))
534                         continue;
535                 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
536                         res = bss;
537                         kref_get(&res->ref);
538                         break;
539                 }
540         }
541
542         spin_unlock_bh(&dev->bss_lock);
543         if (!res)
544                 return NULL;
545         trace_cfg80211_return_bss(&res->pub);
546         return &res->pub;
547 }
548 EXPORT_SYMBOL(cfg80211_get_bss);
549
550 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
551                                        struct ieee80211_channel *channel,
552                                        const u8 *meshid, size_t meshidlen,
553                                        const u8 *meshcfg)
554 {
555         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
556         struct cfg80211_internal_bss *bss, *res = NULL;
557
558         spin_lock_bh(&dev->bss_lock);
559
560         list_for_each_entry(bss, &dev->bss_list, list) {
561                 if (channel && bss->pub.channel != channel)
562                         continue;
563                 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
564                         res = bss;
565                         kref_get(&res->ref);
566                         break;
567                 }
568         }
569
570         spin_unlock_bh(&dev->bss_lock);
571         if (!res)
572                 return NULL;
573         return &res->pub;
574 }
575 EXPORT_SYMBOL(cfg80211_get_mesh);
576
577
578 static void rb_insert_bss(struct cfg80211_registered_device *dev,
579                           struct cfg80211_internal_bss *bss)
580 {
581         struct rb_node **p = &dev->bss_tree.rb_node;
582         struct rb_node *parent = NULL;
583         struct cfg80211_internal_bss *tbss;
584         int cmp;
585
586         while (*p) {
587                 parent = *p;
588                 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
589
590                 cmp = cmp_bss(&bss->pub, &tbss->pub);
591
592                 if (WARN_ON(!cmp)) {
593                         /* will sort of leak this BSS */
594                         return;
595                 }
596
597                 if (cmp < 0)
598                         p = &(*p)->rb_left;
599                 else
600                         p = &(*p)->rb_right;
601         }
602
603         rb_link_node(&bss->rbn, parent, p);
604         rb_insert_color(&bss->rbn, &dev->bss_tree);
605 }
606
607 static struct cfg80211_internal_bss *
608 rb_find_bss(struct cfg80211_registered_device *dev,
609             struct cfg80211_internal_bss *res)
610 {
611         struct rb_node *n = dev->bss_tree.rb_node;
612         struct cfg80211_internal_bss *bss;
613         int r;
614
615         while (n) {
616                 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
617                 r = cmp_bss(&res->pub, &bss->pub);
618
619                 if (r == 0)
620                         return bss;
621                 else if (r < 0)
622                         n = n->rb_left;
623                 else
624                         n = n->rb_right;
625         }
626
627         return NULL;
628 }
629
630 static struct cfg80211_internal_bss *
631 rb_find_hidden_bss(struct cfg80211_registered_device *dev,
632                    struct cfg80211_internal_bss *res)
633 {
634         struct rb_node *n = dev->bss_tree.rb_node;
635         struct cfg80211_internal_bss *bss;
636         int r;
637
638         while (n) {
639                 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
640                 r = cmp_hidden_bss(&res->pub, &bss->pub);
641
642                 if (r == 0)
643                         return bss;
644                 else if (r < 0)
645                         n = n->rb_left;
646                 else
647                         n = n->rb_right;
648         }
649
650         return NULL;
651 }
652
653 static void
654 copy_hidden_ies(struct cfg80211_internal_bss *res,
655                 struct cfg80211_internal_bss *hidden)
656 {
657         const struct cfg80211_bss_ies *ies;
658
659         if (rcu_access_pointer(res->pub.beacon_ies))
660                 return;
661
662         ies = rcu_access_pointer(hidden->pub.beacon_ies);
663         if (WARN_ON(!ies))
664                 return;
665
666         ies = kmemdup(ies, sizeof(*ies) + ies->len, GFP_ATOMIC);
667         if (unlikely(!ies))
668                 return;
669         rcu_assign_pointer(res->pub.beacon_ies, ies);
670 }
671
672 static struct cfg80211_internal_bss *
673 cfg80211_bss_update(struct cfg80211_registered_device *dev,
674                     struct cfg80211_internal_bss *tmp)
675 {
676         struct cfg80211_internal_bss *found = NULL;
677
678         if (WARN_ON(!tmp->pub.channel))
679                 return NULL;
680
681         tmp->ts = jiffies;
682
683         spin_lock_bh(&dev->bss_lock);
684
685         if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
686                 spin_unlock_bh(&dev->bss_lock);
687                 return NULL;
688         }
689
690         found = rb_find_bss(dev, tmp);
691
692         if (found) {
693                 found->pub.beacon_interval = tmp->pub.beacon_interval;
694                 found->pub.tsf = tmp->pub.tsf;
695                 found->pub.signal = tmp->pub.signal;
696                 found->pub.capability = tmp->pub.capability;
697                 found->ts = tmp->ts;
698
699                 /* Update IEs */
700                 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
701                         const struct cfg80211_bss_ies *old;
702
703                         old = rcu_access_pointer(found->pub.proberesp_ies);
704
705                         rcu_assign_pointer(found->pub.proberesp_ies,
706                                            tmp->pub.proberesp_ies);
707                         /* Override possible earlier Beacon frame IEs */
708                         rcu_assign_pointer(found->pub.ies,
709                                            tmp->pub.proberesp_ies);
710                         if (old)
711                                 kfree_rcu((struct cfg80211_bss_ies *)old,
712                                           rcu_head);
713                 } else if (rcu_access_pointer(tmp->pub.beacon_ies)) {
714                         const struct cfg80211_bss_ies *old, *ies;
715
716                         old = rcu_access_pointer(found->pub.beacon_ies);
717                         ies = rcu_access_pointer(found->pub.ies);
718
719                         rcu_assign_pointer(found->pub.beacon_ies,
720                                            tmp->pub.beacon_ies);
721
722                         /* Override IEs if they were from a beacon before */
723                         if (old == ies)
724                                 rcu_assign_pointer(found->pub.ies,
725                                                    tmp->pub.beacon_ies);
726
727                         if (old)
728                                 kfree_rcu((struct cfg80211_bss_ies *)old,
729                                           rcu_head);
730                 }
731         } else {
732                 struct cfg80211_internal_bss *new;
733                 struct cfg80211_internal_bss *hidden;
734                 struct cfg80211_bss_ies *ies;
735
736                 /* First check if the beacon is a probe response from
737                  * a hidden bss. If so, copy beacon ies (with nullified
738                  * ssid) into the probe response bss entry (with real ssid).
739                  * It is required basically for PSM implementation
740                  * (probe responses do not contain tim ie) */
741
742                 /* TODO: The code is not trying to update existing probe
743                  * response bss entries when beacon ies are
744                  * getting changed. */
745                 hidden = rb_find_hidden_bss(dev, tmp);
746                 if (hidden)
747                         copy_hidden_ies(tmp, hidden);
748
749                 /*
750                  * create a copy -- the "res" variable that is passed in
751                  * is allocated on the stack since it's not needed in the
752                  * more common case of an update
753                  */
754                 new = kzalloc(sizeof(*new) + dev->wiphy.bss_priv_size,
755                               GFP_ATOMIC);
756                 if (!new) {
757                         ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
758                         if (ies)
759                                 kfree_rcu(ies, rcu_head);
760                         ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
761                         if (ies)
762                                 kfree_rcu(ies, rcu_head);
763                         spin_unlock_bh(&dev->bss_lock);
764                         return NULL;
765                 }
766                 memcpy(new, tmp, sizeof(*new));
767                 kref_init(&new->ref);
768                 list_add_tail(&new->list, &dev->bss_list);
769                 rb_insert_bss(dev, new);
770                 found = new;
771         }
772
773         dev->bss_generation++;
774         spin_unlock_bh(&dev->bss_lock);
775
776         kref_get(&found->ref);
777         return found;
778 }
779
780 static struct ieee80211_channel *
781 cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
782                          struct ieee80211_channel *channel)
783 {
784         const u8 *tmp;
785         u32 freq;
786         int channel_number = -1;
787
788         tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen);
789         if (tmp && tmp[1] == 1) {
790                 channel_number = tmp[2];
791         } else {
792                 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen);
793                 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) {
794                         struct ieee80211_ht_operation *htop = (void *)(tmp + 2);
795
796                         channel_number = htop->primary_chan;
797                 }
798         }
799
800         if (channel_number < 0)
801                 return channel;
802
803         freq = ieee80211_channel_to_frequency(channel_number, channel->band);
804         channel = ieee80211_get_channel(wiphy, freq);
805         if (!channel)
806                 return NULL;
807         if (channel->flags & IEEE80211_CHAN_DISABLED)
808                 return NULL;
809         return channel;
810 }
811
812 struct cfg80211_bss*
813 cfg80211_inform_bss(struct wiphy *wiphy,
814                     struct ieee80211_channel *channel,
815                     const u8 *bssid, u64 tsf, u16 capability,
816                     u16 beacon_interval, const u8 *ie, size_t ielen,
817                     s32 signal, gfp_t gfp)
818 {
819         struct cfg80211_bss_ies *ies;
820         struct cfg80211_internal_bss tmp = {}, *res;
821
822         if (WARN_ON(!wiphy))
823                 return NULL;
824
825         if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
826                         (signal < 0 || signal > 100)))
827                 return NULL;
828
829         channel = cfg80211_get_bss_channel(wiphy, ie, ielen, channel);
830         if (!channel)
831                 return NULL;
832
833         memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
834         tmp.pub.channel = channel;
835         tmp.pub.signal = signal;
836         tmp.pub.tsf = tsf;
837         tmp.pub.beacon_interval = beacon_interval;
838         tmp.pub.capability = capability;
839         /*
840          * Since we do not know here whether the IEs are from a Beacon or Probe
841          * Response frame, we need to pick one of the options and only use it
842          * with the driver that does not provide the full Beacon/Probe Response
843          * frame. Use Beacon frame pointer to avoid indicating that this should
844          * override the iies pointer should we have received an earlier
845          * indication of Probe Response data.
846          *
847          * The initial buffer for the IEs is allocated with the BSS entry and
848          * is located after the private area.
849          */
850         ies = kmalloc(sizeof(*ies) + ielen, gfp);
851         if (!ies)
852                 return NULL;
853         ies->len = ielen;
854         memcpy(ies->data, ie, ielen);
855
856         rcu_assign_pointer(tmp.pub.beacon_ies, ies);
857         rcu_assign_pointer(tmp.pub.ies, ies);
858
859         res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp);
860         if (!res)
861                 return NULL;
862
863         if (res->pub.capability & WLAN_CAPABILITY_ESS)
864                 regulatory_hint_found_beacon(wiphy, channel, gfp);
865
866         trace_cfg80211_return_bss(&res->pub);
867         /* cfg80211_bss_update gives us a referenced result */
868         return &res->pub;
869 }
870 EXPORT_SYMBOL(cfg80211_inform_bss);
871
872 struct cfg80211_bss *
873 cfg80211_inform_bss_frame(struct wiphy *wiphy,
874                           struct ieee80211_channel *channel,
875                           struct ieee80211_mgmt *mgmt, size_t len,
876                           s32 signal, gfp_t gfp)
877 {
878         struct cfg80211_internal_bss tmp = {}, *res;
879         struct cfg80211_bss_ies *ies;
880         size_t ielen = len - offsetof(struct ieee80211_mgmt,
881                                       u.probe_resp.variable);
882
883         BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
884                         offsetof(struct ieee80211_mgmt, u.beacon.variable));
885
886         trace_cfg80211_inform_bss_frame(wiphy, channel, mgmt, len, signal);
887
888         if (WARN_ON(!mgmt))
889                 return NULL;
890
891         if (WARN_ON(!wiphy))
892                 return NULL;
893
894         if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
895                     (signal < 0 || signal > 100)))
896                 return NULL;
897
898         if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
899                 return NULL;
900
901         channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable,
902                                            ielen, channel);
903         if (!channel)
904                 return NULL;
905
906         ies = kmalloc(sizeof(*ies) + ielen, gfp);
907         if (!ies)
908                 return NULL;
909         ies->len = ielen;
910         memcpy(ies->data, mgmt->u.probe_resp.variable, ielen);
911
912         if (ieee80211_is_probe_resp(mgmt->frame_control))
913                 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
914         else
915                 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
916         rcu_assign_pointer(tmp.pub.ies, ies);
917         
918         memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN);
919         tmp.pub.channel = channel;
920         tmp.pub.signal = signal;
921         tmp.pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
922         tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
923         tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
924
925         res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp);
926         if (!res)
927                 return NULL;
928
929         if (res->pub.capability & WLAN_CAPABILITY_ESS)
930                 regulatory_hint_found_beacon(wiphy, channel, gfp);
931
932         trace_cfg80211_return_bss(&res->pub);
933         /* cfg80211_bss_update gives us a referenced result */
934         return &res->pub;
935 }
936 EXPORT_SYMBOL(cfg80211_inform_bss_frame);
937
938 void cfg80211_ref_bss(struct cfg80211_bss *pub)
939 {
940         struct cfg80211_internal_bss *bss;
941
942         if (!pub)
943                 return;
944
945         bss = container_of(pub, struct cfg80211_internal_bss, pub);
946         kref_get(&bss->ref);
947 }
948 EXPORT_SYMBOL(cfg80211_ref_bss);
949
950 void cfg80211_put_bss(struct cfg80211_bss *pub)
951 {
952         struct cfg80211_internal_bss *bss;
953
954         if (!pub)
955                 return;
956
957         bss = container_of(pub, struct cfg80211_internal_bss, pub);
958         kref_put(&bss->ref, bss_release);
959 }
960 EXPORT_SYMBOL(cfg80211_put_bss);
961
962 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
963 {
964         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
965         struct cfg80211_internal_bss *bss;
966
967         if (WARN_ON(!pub))
968                 return;
969
970         bss = container_of(pub, struct cfg80211_internal_bss, pub);
971
972         spin_lock_bh(&dev->bss_lock);
973         if (!list_empty(&bss->list)) {
974                 __cfg80211_unlink_bss(dev, bss);
975                 dev->bss_generation++;
976         }
977         spin_unlock_bh(&dev->bss_lock);
978 }
979 EXPORT_SYMBOL(cfg80211_unlink_bss);
980
981 #ifdef CONFIG_CFG80211_WEXT
982 int cfg80211_wext_siwscan(struct net_device *dev,
983                           struct iw_request_info *info,
984                           union iwreq_data *wrqu, char *extra)
985 {
986         struct cfg80211_registered_device *rdev;
987         struct wiphy *wiphy;
988         struct iw_scan_req *wreq = NULL;
989         struct cfg80211_scan_request *creq = NULL;
990         int i, err, n_channels = 0;
991         enum ieee80211_band band;
992
993         if (!netif_running(dev))
994                 return -ENETDOWN;
995
996         if (wrqu->data.length == sizeof(struct iw_scan_req))
997                 wreq = (struct iw_scan_req *)extra;
998
999         rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1000
1001         if (IS_ERR(rdev))
1002                 return PTR_ERR(rdev);
1003
1004         if (rdev->scan_req) {
1005                 err = -EBUSY;
1006                 goto out;
1007         }
1008
1009         wiphy = &rdev->wiphy;
1010
1011         /* Determine number of channels, needed to allocate creq */
1012         if (wreq && wreq->num_channels)
1013                 n_channels = wreq->num_channels;
1014         else {
1015                 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
1016                         if (wiphy->bands[band])
1017                                 n_channels += wiphy->bands[band]->n_channels;
1018         }
1019
1020         creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
1021                        n_channels * sizeof(void *),
1022                        GFP_ATOMIC);
1023         if (!creq) {
1024                 err = -ENOMEM;
1025                 goto out;
1026         }
1027
1028         creq->wiphy = wiphy;
1029         creq->wdev = dev->ieee80211_ptr;
1030         /* SSIDs come after channels */
1031         creq->ssids = (void *)&creq->channels[n_channels];
1032         creq->n_channels = n_channels;
1033         creq->n_ssids = 1;
1034         creq->scan_start = jiffies;
1035
1036         /* translate "Scan on frequencies" request */
1037         i = 0;
1038         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1039                 int j;
1040
1041                 if (!wiphy->bands[band])
1042                         continue;
1043
1044                 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
1045                         /* ignore disabled channels */
1046                         if (wiphy->bands[band]->channels[j].flags &
1047                                                 IEEE80211_CHAN_DISABLED)
1048                                 continue;
1049
1050                         /* If we have a wireless request structure and the
1051                          * wireless request specifies frequencies, then search
1052                          * for the matching hardware channel.
1053                          */
1054                         if (wreq && wreq->num_channels) {
1055                                 int k;
1056                                 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
1057                                 for (k = 0; k < wreq->num_channels; k++) {
1058                                         int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]);
1059                                         if (wext_freq == wiphy_freq)
1060                                                 goto wext_freq_found;
1061                                 }
1062                                 goto wext_freq_not_found;
1063                         }
1064
1065                 wext_freq_found:
1066                         creq->channels[i] = &wiphy->bands[band]->channels[j];
1067                         i++;
1068                 wext_freq_not_found: ;
1069                 }
1070         }
1071         /* No channels found? */
1072         if (!i) {
1073                 err = -EINVAL;
1074                 goto out;
1075         }
1076
1077         /* Set real number of channels specified in creq->channels[] */
1078         creq->n_channels = i;
1079
1080         /* translate "Scan for SSID" request */
1081         if (wreq) {
1082                 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
1083                         if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
1084                                 err = -EINVAL;
1085                                 goto out;
1086                         }
1087                         memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
1088                         creq->ssids[0].ssid_len = wreq->essid_len;
1089                 }
1090                 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
1091                         creq->n_ssids = 0;
1092         }
1093
1094         for (i = 0; i < IEEE80211_NUM_BANDS; i++)
1095                 if (wiphy->bands[i])
1096                         creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
1097
1098         rdev->scan_req = creq;
1099         err = rdev_scan(rdev, creq);
1100         if (err) {
1101                 rdev->scan_req = NULL;
1102                 /* creq will be freed below */
1103         } else {
1104                 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
1105                 /* creq now owned by driver */
1106                 creq = NULL;
1107                 dev_hold(dev);
1108         }
1109  out:
1110         kfree(creq);
1111         cfg80211_unlock_rdev(rdev);
1112         return err;
1113 }
1114 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
1115
1116 static void ieee80211_scan_add_ies(struct iw_request_info *info,
1117                                    const struct cfg80211_bss_ies *ies,
1118                                    char **current_ev, char *end_buf)
1119 {
1120         const u8 *pos, *end, *next;
1121         struct iw_event iwe;
1122
1123         if (!ies)
1124                 return;
1125
1126         /*
1127          * If needed, fragment the IEs buffer (at IE boundaries) into short
1128          * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
1129          */
1130         pos = ies->data;
1131         end = pos + ies->len;
1132
1133         while (end - pos > IW_GENERIC_IE_MAX) {
1134                 next = pos + 2 + pos[1];
1135                 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
1136                         next = next + 2 + next[1];
1137
1138                 memset(&iwe, 0, sizeof(iwe));
1139                 iwe.cmd = IWEVGENIE;
1140                 iwe.u.data.length = next - pos;
1141                 *current_ev = iwe_stream_add_point(info, *current_ev,
1142                                                    end_buf, &iwe,
1143                                                    (void *)pos);
1144
1145                 pos = next;
1146         }
1147
1148         if (end > pos) {
1149                 memset(&iwe, 0, sizeof(iwe));
1150                 iwe.cmd = IWEVGENIE;
1151                 iwe.u.data.length = end - pos;
1152                 *current_ev = iwe_stream_add_point(info, *current_ev,
1153                                                    end_buf, &iwe,
1154                                                    (void *)pos);
1155         }
1156 }
1157
1158 static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
1159 {
1160         unsigned long end = jiffies;
1161
1162         if (end >= start)
1163                 return jiffies_to_msecs(end - start);
1164
1165         return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
1166 }
1167
1168 static char *
1169 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
1170               struct cfg80211_internal_bss *bss, char *current_ev,
1171               char *end_buf)
1172 {
1173         const struct cfg80211_bss_ies *ies;
1174         struct iw_event iwe;
1175         const u8 *ie;
1176         u8 *buf, *cfg, *p;
1177         int rem, i, sig;
1178         bool ismesh = false;
1179
1180         memset(&iwe, 0, sizeof(iwe));
1181         iwe.cmd = SIOCGIWAP;
1182         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1183         memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
1184         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1185                                           IW_EV_ADDR_LEN);
1186
1187         memset(&iwe, 0, sizeof(iwe));
1188         iwe.cmd = SIOCGIWFREQ;
1189         iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
1190         iwe.u.freq.e = 0;
1191         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1192                                           IW_EV_FREQ_LEN);
1193
1194         memset(&iwe, 0, sizeof(iwe));
1195         iwe.cmd = SIOCGIWFREQ;
1196         iwe.u.freq.m = bss->pub.channel->center_freq;
1197         iwe.u.freq.e = 6;
1198         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1199                                           IW_EV_FREQ_LEN);
1200
1201         if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
1202                 memset(&iwe, 0, sizeof(iwe));
1203                 iwe.cmd = IWEVQUAL;
1204                 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
1205                                      IW_QUAL_NOISE_INVALID |
1206                                      IW_QUAL_QUAL_UPDATED;
1207                 switch (wiphy->signal_type) {
1208                 case CFG80211_SIGNAL_TYPE_MBM:
1209                         sig = bss->pub.signal / 100;
1210                         iwe.u.qual.level = sig;
1211                         iwe.u.qual.updated |= IW_QUAL_DBM;
1212                         if (sig < -110)         /* rather bad */
1213                                 sig = -110;
1214                         else if (sig > -40)     /* perfect */
1215                                 sig = -40;
1216                         /* will give a range of 0 .. 70 */
1217                         iwe.u.qual.qual = sig + 110;
1218                         break;
1219                 case CFG80211_SIGNAL_TYPE_UNSPEC:
1220                         iwe.u.qual.level = bss->pub.signal;
1221                         /* will give range 0 .. 100 */
1222                         iwe.u.qual.qual = bss->pub.signal;
1223                         break;
1224                 default:
1225                         /* not reached */
1226                         break;
1227                 }
1228                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1229                                                   &iwe, IW_EV_QUAL_LEN);
1230         }
1231
1232         memset(&iwe, 0, sizeof(iwe));
1233         iwe.cmd = SIOCGIWENCODE;
1234         if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
1235                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1236         else
1237                 iwe.u.data.flags = IW_ENCODE_DISABLED;
1238         iwe.u.data.length = 0;
1239         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1240                                           &iwe, "");
1241
1242         rcu_read_lock();
1243         ies = rcu_dereference(bss->pub.ies);
1244         if (ies) {
1245                 rem = ies->len;
1246                 ie = ies->data;
1247         } else {
1248                 rem = 0;
1249                 ie = NULL;
1250         }
1251
1252         while (ies && rem >= 2) {
1253                 /* invalid data */
1254                 if (ie[1] > rem - 2)
1255                         break;
1256
1257                 switch (ie[0]) {
1258                 case WLAN_EID_SSID:
1259                         memset(&iwe, 0, sizeof(iwe));
1260                         iwe.cmd = SIOCGIWESSID;
1261                         iwe.u.data.length = ie[1];
1262                         iwe.u.data.flags = 1;
1263                         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1264                                                           &iwe, (u8 *)ie + 2);
1265                         break;
1266                 case WLAN_EID_MESH_ID:
1267                         memset(&iwe, 0, sizeof(iwe));
1268                         iwe.cmd = SIOCGIWESSID;
1269                         iwe.u.data.length = ie[1];
1270                         iwe.u.data.flags = 1;
1271                         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1272                                                           &iwe, (u8 *)ie + 2);
1273                         break;
1274                 case WLAN_EID_MESH_CONFIG:
1275                         ismesh = true;
1276                         if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
1277                                 break;
1278                         buf = kmalloc(50, GFP_ATOMIC);
1279                         if (!buf)
1280                                 break;
1281                         cfg = (u8 *)ie + 2;
1282                         memset(&iwe, 0, sizeof(iwe));
1283                         iwe.cmd = IWEVCUSTOM;
1284                         sprintf(buf, "Mesh Network Path Selection Protocol ID: "
1285                                 "0x%02X", cfg[0]);
1286                         iwe.u.data.length = strlen(buf);
1287                         current_ev = iwe_stream_add_point(info, current_ev,
1288                                                           end_buf,
1289                                                           &iwe, buf);
1290                         sprintf(buf, "Path Selection Metric ID: 0x%02X",
1291                                 cfg[1]);
1292                         iwe.u.data.length = strlen(buf);
1293                         current_ev = iwe_stream_add_point(info, current_ev,
1294                                                           end_buf,
1295                                                           &iwe, buf);
1296                         sprintf(buf, "Congestion Control Mode ID: 0x%02X",
1297                                 cfg[2]);
1298                         iwe.u.data.length = strlen(buf);
1299                         current_ev = iwe_stream_add_point(info, current_ev,
1300                                                           end_buf,
1301                                                           &iwe, buf);
1302                         sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
1303                         iwe.u.data.length = strlen(buf);
1304                         current_ev = iwe_stream_add_point(info, current_ev,
1305                                                           end_buf,
1306                                                           &iwe, buf);
1307                         sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
1308                         iwe.u.data.length = strlen(buf);
1309                         current_ev = iwe_stream_add_point(info, current_ev,
1310                                                           end_buf,
1311                                                           &iwe, buf);
1312                         sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
1313                         iwe.u.data.length = strlen(buf);
1314                         current_ev = iwe_stream_add_point(info, current_ev,
1315                                                           end_buf,
1316                                                           &iwe, buf);
1317                         sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
1318                         iwe.u.data.length = strlen(buf);
1319                         current_ev = iwe_stream_add_point(info, current_ev,
1320                                                           end_buf,
1321                                                           &iwe, buf);
1322                         kfree(buf);
1323                         break;
1324                 case WLAN_EID_SUPP_RATES:
1325                 case WLAN_EID_EXT_SUPP_RATES:
1326                         /* display all supported rates in readable format */
1327                         p = current_ev + iwe_stream_lcp_len(info);
1328
1329                         memset(&iwe, 0, sizeof(iwe));
1330                         iwe.cmd = SIOCGIWRATE;
1331                         /* Those two flags are ignored... */
1332                         iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
1333
1334                         for (i = 0; i < ie[1]; i++) {
1335                                 iwe.u.bitrate.value =
1336                                         ((ie[i + 2] & 0x7f) * 500000);
1337                                 p = iwe_stream_add_value(info, current_ev, p,
1338                                                 end_buf, &iwe, IW_EV_PARAM_LEN);
1339                         }
1340                         current_ev = p;
1341                         break;
1342                 }
1343                 rem -= ie[1] + 2;
1344                 ie += ie[1] + 2;
1345         }
1346
1347         if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
1348             ismesh) {
1349                 memset(&iwe, 0, sizeof(iwe));
1350                 iwe.cmd = SIOCGIWMODE;
1351                 if (ismesh)
1352                         iwe.u.mode = IW_MODE_MESH;
1353                 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
1354                         iwe.u.mode = IW_MODE_MASTER;
1355                 else
1356                         iwe.u.mode = IW_MODE_ADHOC;
1357                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1358                                                   &iwe, IW_EV_UINT_LEN);
1359         }
1360
1361         buf = kmalloc(30, GFP_ATOMIC);
1362         if (buf) {
1363                 memset(&iwe, 0, sizeof(iwe));
1364                 iwe.cmd = IWEVCUSTOM;
1365                 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
1366                 iwe.u.data.length = strlen(buf);
1367                 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1368                                                   &iwe, buf);
1369                 memset(&iwe, 0, sizeof(iwe));
1370                 iwe.cmd = IWEVCUSTOM;
1371                 sprintf(buf, " Last beacon: %ums ago",
1372                         elapsed_jiffies_msecs(bss->ts));
1373                 iwe.u.data.length = strlen(buf);
1374                 current_ev = iwe_stream_add_point(info, current_ev,
1375                                                   end_buf, &iwe, buf);
1376                 kfree(buf);
1377         }
1378
1379         ieee80211_scan_add_ies(info, ies, &current_ev, end_buf);
1380         rcu_read_unlock();
1381
1382         return current_ev;
1383 }
1384
1385
1386 static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
1387                                   struct iw_request_info *info,
1388                                   char *buf, size_t len)
1389 {
1390         char *current_ev = buf;
1391         char *end_buf = buf + len;
1392         struct cfg80211_internal_bss *bss;
1393
1394         spin_lock_bh(&dev->bss_lock);
1395         cfg80211_bss_expire(dev);
1396
1397         list_for_each_entry(bss, &dev->bss_list, list) {
1398                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
1399                         spin_unlock_bh(&dev->bss_lock);
1400                         return -E2BIG;
1401                 }
1402                 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
1403                                            current_ev, end_buf);
1404         }
1405         spin_unlock_bh(&dev->bss_lock);
1406         return current_ev - buf;
1407 }
1408
1409
1410 int cfg80211_wext_giwscan(struct net_device *dev,
1411                           struct iw_request_info *info,
1412                           struct iw_point *data, char *extra)
1413 {
1414         struct cfg80211_registered_device *rdev;
1415         int res;
1416
1417         if (!netif_running(dev))
1418                 return -ENETDOWN;
1419
1420         rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1421
1422         if (IS_ERR(rdev))
1423                 return PTR_ERR(rdev);
1424
1425         if (rdev->scan_req) {
1426                 res = -EAGAIN;
1427                 goto out;
1428         }
1429
1430         res = ieee80211_scan_results(rdev, info, extra, data->length);
1431         data->length = 0;
1432         if (res >= 0) {
1433                 data->length = res;
1434                 res = 0;
1435         }
1436
1437  out:
1438         cfg80211_unlock_rdev(rdev);
1439         return res;
1440 }
1441 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);
1442 #endif