Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-2.6
[linux-2.6.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/iw_handler.h>
16 #include "core.h"
17 #include "nl80211.h"
18 #include "wext-compat.h"
19
20 #define IEEE80211_SCAN_RESULT_EXPIRE    (15 * HZ)
21
22 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak)
23 {
24         struct cfg80211_scan_request *request;
25         struct net_device *dev;
26 #ifdef CONFIG_CFG80211_WEXT
27         union iwreq_data wrqu;
28 #endif
29
30         ASSERT_RDEV_LOCK(rdev);
31
32         request = rdev->scan_req;
33
34         if (!request)
35                 return;
36
37         dev = request->dev;
38
39         /*
40          * This must be before sending the other events!
41          * Otherwise, wpa_supplicant gets completely confused with
42          * wext events.
43          */
44         cfg80211_sme_scan_done(dev);
45
46         if (request->aborted)
47                 nl80211_send_scan_aborted(rdev, dev);
48         else
49                 nl80211_send_scan_done(rdev, dev);
50
51 #ifdef CONFIG_CFG80211_WEXT
52         if (!request->aborted) {
53                 memset(&wrqu, 0, sizeof(wrqu));
54
55                 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
56         }
57 #endif
58
59         dev_put(dev);
60
61         rdev->scan_req = NULL;
62
63         /*
64          * OK. If this is invoked with "leak" then we can't
65          * free this ... but we've cleaned it up anyway. The
66          * driver failed to call the scan_done callback, so
67          * all bets are off, it might still be trying to use
68          * the scan request or not ... if it accesses the dev
69          * in there (it shouldn't anyway) then it may crash.
70          */
71         if (!leak)
72                 kfree(request);
73 }
74
75 void __cfg80211_scan_done(struct work_struct *wk)
76 {
77         struct cfg80211_registered_device *rdev;
78
79         rdev = container_of(wk, struct cfg80211_registered_device,
80                             scan_done_wk);
81
82         cfg80211_lock_rdev(rdev);
83         ___cfg80211_scan_done(rdev, false);
84         cfg80211_unlock_rdev(rdev);
85 }
86
87 void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
88 {
89         WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);
90
91         request->aborted = aborted;
92         queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk);
93 }
94 EXPORT_SYMBOL(cfg80211_scan_done);
95
96 void __cfg80211_sched_scan_results(struct work_struct *wk)
97 {
98         struct cfg80211_registered_device *rdev;
99
100         rdev = container_of(wk, struct cfg80211_registered_device,
101                             sched_scan_results_wk);
102
103         cfg80211_lock_rdev(rdev);
104
105         /* we don't have sched_scan_req anymore if the scan is stopping */
106         if (rdev->sched_scan_req)
107                 nl80211_send_sched_scan_results(rdev,
108                                                 rdev->sched_scan_req->dev);
109
110         cfg80211_unlock_rdev(rdev);
111 }
112
113 void cfg80211_sched_scan_results(struct wiphy *wiphy)
114 {
115         /* ignore if we're not scanning */
116         if (wiphy_to_dev(wiphy)->sched_scan_req)
117                 queue_work(cfg80211_wq,
118                            &wiphy_to_dev(wiphy)->sched_scan_results_wk);
119 }
120 EXPORT_SYMBOL(cfg80211_sched_scan_results);
121
122 void cfg80211_sched_scan_stopped(struct wiphy *wiphy)
123 {
124         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
125
126         cfg80211_lock_rdev(rdev);
127         __cfg80211_stop_sched_scan(rdev, true);
128         cfg80211_unlock_rdev(rdev);
129 }
130 EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
131
132 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
133                                bool driver_initiated)
134 {
135         int err;
136         struct net_device *dev;
137
138         ASSERT_RDEV_LOCK(rdev);
139
140         if (!rdev->sched_scan_req)
141                 return 0;
142
143         dev = rdev->sched_scan_req->dev;
144
145         if (!driver_initiated) {
146                 err = rdev->ops->sched_scan_stop(&rdev->wiphy, dev);
147                 if (err)
148                         return err;
149         }
150
151         nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED);
152
153         kfree(rdev->sched_scan_req);
154         rdev->sched_scan_req = NULL;
155
156         return err;
157 }
158
159 static void bss_release(struct kref *ref)
160 {
161         struct cfg80211_internal_bss *bss;
162
163         bss = container_of(ref, struct cfg80211_internal_bss, ref);
164         if (bss->pub.free_priv)
165                 bss->pub.free_priv(&bss->pub);
166
167         if (bss->beacon_ies_allocated)
168                 kfree(bss->pub.beacon_ies);
169         if (bss->proberesp_ies_allocated)
170                 kfree(bss->pub.proberesp_ies);
171
172         BUG_ON(atomic_read(&bss->hold));
173
174         kfree(bss);
175 }
176
177 /* must hold dev->bss_lock! */
178 void cfg80211_bss_age(struct cfg80211_registered_device *dev,
179                       unsigned long age_secs)
180 {
181         struct cfg80211_internal_bss *bss;
182         unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
183
184         list_for_each_entry(bss, &dev->bss_list, list) {
185                 bss->ts -= age_jiffies;
186         }
187 }
188
189 /* must hold dev->bss_lock! */
190 static void __cfg80211_unlink_bss(struct cfg80211_registered_device *dev,
191                                   struct cfg80211_internal_bss *bss)
192 {
193         list_del_init(&bss->list);
194         rb_erase(&bss->rbn, &dev->bss_tree);
195         kref_put(&bss->ref, bss_release);
196 }
197
198 /* must hold dev->bss_lock! */
199 void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
200 {
201         struct cfg80211_internal_bss *bss, *tmp;
202         bool expired = false;
203
204         list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
205                 if (atomic_read(&bss->hold))
206                         continue;
207                 if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE))
208                         continue;
209                 __cfg80211_unlink_bss(dev, bss);
210                 expired = true;
211         }
212
213         if (expired)
214                 dev->bss_generation++;
215 }
216
217 const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len)
218 {
219         while (len > 2 && ies[0] != eid) {
220                 len -= ies[1] + 2;
221                 ies += ies[1] + 2;
222         }
223         if (len < 2)
224                 return NULL;
225         if (len < 2 + ies[1])
226                 return NULL;
227         return ies;
228 }
229 EXPORT_SYMBOL(cfg80211_find_ie);
230
231 static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
232 {
233         const u8 *ie1 = cfg80211_find_ie(num, ies1, len1);
234         const u8 *ie2 = cfg80211_find_ie(num, ies2, len2);
235         int r;
236
237         if (!ie1 && !ie2)
238                 return 0;
239         if (!ie1 || !ie2)
240                 return -1;
241
242         r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1]));
243         if (r == 0 && ie1[1] != ie2[1])
244                 return ie2[1] - ie1[1];
245         return r;
246 }
247
248 static bool is_bss(struct cfg80211_bss *a,
249                    const u8 *bssid,
250                    const u8 *ssid, size_t ssid_len)
251 {
252         const u8 *ssidie;
253
254         if (bssid && compare_ether_addr(a->bssid, bssid))
255                 return false;
256
257         if (!ssid)
258                 return true;
259
260         ssidie = cfg80211_find_ie(WLAN_EID_SSID,
261                                   a->information_elements,
262                                   a->len_information_elements);
263         if (!ssidie)
264                 return false;
265         if (ssidie[1] != ssid_len)
266                 return false;
267         return memcmp(ssidie + 2, ssid, ssid_len) == 0;
268 }
269
270 static bool is_mesh_bss(struct cfg80211_bss *a)
271 {
272         const u8 *ie;
273
274         if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
275                 return false;
276
277         ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
278                               a->information_elements,
279                               a->len_information_elements);
280         if (!ie)
281                 return false;
282
283         ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
284                               a->information_elements,
285                               a->len_information_elements);
286         if (!ie)
287                 return false;
288
289         return true;
290 }
291
292 static bool is_mesh(struct cfg80211_bss *a,
293                     const u8 *meshid, size_t meshidlen,
294                     const u8 *meshcfg)
295 {
296         const u8 *ie;
297
298         if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
299                 return false;
300
301         ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
302                               a->information_elements,
303                               a->len_information_elements);
304         if (!ie)
305                 return false;
306         if (ie[1] != meshidlen)
307                 return false;
308         if (memcmp(ie + 2, meshid, meshidlen))
309                 return false;
310
311         ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
312                               a->information_elements,
313                               a->len_information_elements);
314         if (!ie)
315                 return false;
316         if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
317                 return false;
318
319         /*
320          * Ignore mesh capability (last two bytes of the IE) when
321          * comparing since that may differ between stations taking
322          * part in the same mesh.
323          */
324         return memcmp(ie + 2, meshcfg,
325             sizeof(struct ieee80211_meshconf_ie) - 2) == 0;
326 }
327
328 static int cmp_bss(struct cfg80211_bss *a,
329                    struct cfg80211_bss *b)
330 {
331         int r;
332
333         if (a->channel != b->channel)
334                 return b->channel->center_freq - a->channel->center_freq;
335
336         if (is_mesh_bss(a) && is_mesh_bss(b)) {
337                 r = cmp_ies(WLAN_EID_MESH_ID,
338                             a->information_elements,
339                             a->len_information_elements,
340                             b->information_elements,
341                             b->len_information_elements);
342                 if (r)
343                         return r;
344                 return cmp_ies(WLAN_EID_MESH_CONFIG,
345                                a->information_elements,
346                                a->len_information_elements,
347                                b->information_elements,
348                                b->len_information_elements);
349         }
350
351         r = memcmp(a->bssid, b->bssid, ETH_ALEN);
352         if (r)
353                 return r;
354
355         return cmp_ies(WLAN_EID_SSID,
356                        a->information_elements,
357                        a->len_information_elements,
358                        b->information_elements,
359                        b->len_information_elements);
360 }
361
362 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
363                                       struct ieee80211_channel *channel,
364                                       const u8 *bssid,
365                                       const u8 *ssid, size_t ssid_len,
366                                       u16 capa_mask, u16 capa_val)
367 {
368         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
369         struct cfg80211_internal_bss *bss, *res = NULL;
370         unsigned long now = jiffies;
371
372         spin_lock_bh(&dev->bss_lock);
373
374         list_for_each_entry(bss, &dev->bss_list, list) {
375                 if ((bss->pub.capability & capa_mask) != capa_val)
376                         continue;
377                 if (channel && bss->pub.channel != channel)
378                         continue;
379                 /* Don't get expired BSS structs */
380                 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
381                     !atomic_read(&bss->hold))
382                         continue;
383                 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
384                         res = bss;
385                         kref_get(&res->ref);
386                         break;
387                 }
388         }
389
390         spin_unlock_bh(&dev->bss_lock);
391         if (!res)
392                 return NULL;
393         return &res->pub;
394 }
395 EXPORT_SYMBOL(cfg80211_get_bss);
396
397 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
398                                        struct ieee80211_channel *channel,
399                                        const u8 *meshid, size_t meshidlen,
400                                        const u8 *meshcfg)
401 {
402         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
403         struct cfg80211_internal_bss *bss, *res = NULL;
404
405         spin_lock_bh(&dev->bss_lock);
406
407         list_for_each_entry(bss, &dev->bss_list, list) {
408                 if (channel && bss->pub.channel != channel)
409                         continue;
410                 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
411                         res = bss;
412                         kref_get(&res->ref);
413                         break;
414                 }
415         }
416
417         spin_unlock_bh(&dev->bss_lock);
418         if (!res)
419                 return NULL;
420         return &res->pub;
421 }
422 EXPORT_SYMBOL(cfg80211_get_mesh);
423
424
425 static void rb_insert_bss(struct cfg80211_registered_device *dev,
426                           struct cfg80211_internal_bss *bss)
427 {
428         struct rb_node **p = &dev->bss_tree.rb_node;
429         struct rb_node *parent = NULL;
430         struct cfg80211_internal_bss *tbss;
431         int cmp;
432
433         while (*p) {
434                 parent = *p;
435                 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
436
437                 cmp = cmp_bss(&bss->pub, &tbss->pub);
438
439                 if (WARN_ON(!cmp)) {
440                         /* will sort of leak this BSS */
441                         return;
442                 }
443
444                 if (cmp < 0)
445                         p = &(*p)->rb_left;
446                 else
447                         p = &(*p)->rb_right;
448         }
449
450         rb_link_node(&bss->rbn, parent, p);
451         rb_insert_color(&bss->rbn, &dev->bss_tree);
452 }
453
454 static struct cfg80211_internal_bss *
455 rb_find_bss(struct cfg80211_registered_device *dev,
456             struct cfg80211_internal_bss *res)
457 {
458         struct rb_node *n = dev->bss_tree.rb_node;
459         struct cfg80211_internal_bss *bss;
460         int r;
461
462         while (n) {
463                 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
464                 r = cmp_bss(&res->pub, &bss->pub);
465
466                 if (r == 0)
467                         return bss;
468                 else if (r < 0)
469                         n = n->rb_left;
470                 else
471                         n = n->rb_right;
472         }
473
474         return NULL;
475 }
476
477 static struct cfg80211_internal_bss *
478 cfg80211_bss_update(struct cfg80211_registered_device *dev,
479                     struct cfg80211_internal_bss *res)
480 {
481         struct cfg80211_internal_bss *found = NULL;
482
483         /*
484          * The reference to "res" is donated to this function.
485          */
486
487         if (WARN_ON(!res->pub.channel)) {
488                 kref_put(&res->ref, bss_release);
489                 return NULL;
490         }
491
492         res->ts = jiffies;
493
494         spin_lock_bh(&dev->bss_lock);
495
496         found = rb_find_bss(dev, res);
497
498         if (found) {
499                 found->pub.beacon_interval = res->pub.beacon_interval;
500                 found->pub.tsf = res->pub.tsf;
501                 found->pub.signal = res->pub.signal;
502                 found->pub.capability = res->pub.capability;
503                 found->ts = res->ts;
504
505                 /* Update IEs */
506                 if (res->pub.proberesp_ies) {
507                         size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
508                         size_t ielen = res->pub.len_proberesp_ies;
509
510                         if (found->pub.proberesp_ies &&
511                             !found->proberesp_ies_allocated &&
512                             ksize(found) >= used + ielen) {
513                                 memcpy(found->pub.proberesp_ies,
514                                        res->pub.proberesp_ies, ielen);
515                                 found->pub.len_proberesp_ies = ielen;
516                         } else {
517                                 u8 *ies = found->pub.proberesp_ies;
518
519                                 if (found->proberesp_ies_allocated)
520                                         ies = krealloc(ies, ielen, GFP_ATOMIC);
521                                 else
522                                         ies = kmalloc(ielen, GFP_ATOMIC);
523
524                                 if (ies) {
525                                         memcpy(ies, res->pub.proberesp_ies,
526                                                ielen);
527                                         found->proberesp_ies_allocated = true;
528                                         found->pub.proberesp_ies = ies;
529                                         found->pub.len_proberesp_ies = ielen;
530                                 }
531                         }
532
533                         /* Override possible earlier Beacon frame IEs */
534                         found->pub.information_elements =
535                                 found->pub.proberesp_ies;
536                         found->pub.len_information_elements =
537                                 found->pub.len_proberesp_ies;
538                 }
539                 if (res->pub.beacon_ies) {
540                         size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
541                         size_t ielen = res->pub.len_beacon_ies;
542                         bool information_elements_is_beacon_ies =
543                                 (found->pub.information_elements ==
544                                  found->pub.beacon_ies);
545
546                         if (found->pub.beacon_ies &&
547                             !found->beacon_ies_allocated &&
548                             ksize(found) >= used + ielen) {
549                                 memcpy(found->pub.beacon_ies,
550                                        res->pub.beacon_ies, ielen);
551                                 found->pub.len_beacon_ies = ielen;
552                         } else {
553                                 u8 *ies = found->pub.beacon_ies;
554
555                                 if (found->beacon_ies_allocated)
556                                         ies = krealloc(ies, ielen, GFP_ATOMIC);
557                                 else
558                                         ies = kmalloc(ielen, GFP_ATOMIC);
559
560                                 if (ies) {
561                                         memcpy(ies, res->pub.beacon_ies,
562                                                ielen);
563                                         found->beacon_ies_allocated = true;
564                                         found->pub.beacon_ies = ies;
565                                         found->pub.len_beacon_ies = ielen;
566                                 }
567                         }
568
569                         /* Override IEs if they were from a beacon before */
570                         if (information_elements_is_beacon_ies) {
571                                 found->pub.information_elements =
572                                         found->pub.beacon_ies;
573                                 found->pub.len_information_elements =
574                                         found->pub.len_beacon_ies;
575                         }
576                 }
577
578                 kref_put(&res->ref, bss_release);
579         } else {
580                 /* this "consumes" the reference */
581                 list_add_tail(&res->list, &dev->bss_list);
582                 rb_insert_bss(dev, res);
583                 found = res;
584         }
585
586         dev->bss_generation++;
587         spin_unlock_bh(&dev->bss_lock);
588
589         kref_get(&found->ref);
590         return found;
591 }
592
593 struct cfg80211_bss*
594 cfg80211_inform_bss(struct wiphy *wiphy,
595                     struct ieee80211_channel *channel,
596                     const u8 *bssid,
597                     u64 timestamp, u16 capability, u16 beacon_interval,
598                     const u8 *ie, size_t ielen,
599                     s32 signal, gfp_t gfp)
600 {
601         struct cfg80211_internal_bss *res;
602         size_t privsz;
603
604         if (WARN_ON(!wiphy))
605                 return NULL;
606
607         privsz = wiphy->bss_priv_size;
608
609         if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
610                         (signal < 0 || signal > 100)))
611                 return NULL;
612
613         res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
614         if (!res)
615                 return NULL;
616
617         memcpy(res->pub.bssid, bssid, ETH_ALEN);
618         res->pub.channel = channel;
619         res->pub.signal = signal;
620         res->pub.tsf = timestamp;
621         res->pub.beacon_interval = beacon_interval;
622         res->pub.capability = capability;
623         /*
624          * Since we do not know here whether the IEs are from a Beacon or Probe
625          * Response frame, we need to pick one of the options and only use it
626          * with the driver that does not provide the full Beacon/Probe Response
627          * frame. Use Beacon frame pointer to avoid indicating that this should
628          * override the information_elements pointer should we have received an
629          * earlier indication of Probe Response data.
630          *
631          * The initial buffer for the IEs is allocated with the BSS entry and
632          * is located after the private area.
633          */
634         res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz;
635         memcpy(res->pub.beacon_ies, ie, ielen);
636         res->pub.len_beacon_ies = ielen;
637         res->pub.information_elements = res->pub.beacon_ies;
638         res->pub.len_information_elements = res->pub.len_beacon_ies;
639
640         kref_init(&res->ref);
641
642         res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
643         if (!res)
644                 return NULL;
645
646         if (res->pub.capability & WLAN_CAPABILITY_ESS)
647                 regulatory_hint_found_beacon(wiphy, channel, gfp);
648
649         /* cfg80211_bss_update gives us a referenced result */
650         return &res->pub;
651 }
652 EXPORT_SYMBOL(cfg80211_inform_bss);
653
654 struct cfg80211_bss *
655 cfg80211_inform_bss_frame(struct wiphy *wiphy,
656                           struct ieee80211_channel *channel,
657                           struct ieee80211_mgmt *mgmt, size_t len,
658                           s32 signal, gfp_t gfp)
659 {
660         struct cfg80211_internal_bss *res;
661         size_t ielen = len - offsetof(struct ieee80211_mgmt,
662                                       u.probe_resp.variable);
663         size_t privsz;
664
665         if (WARN_ON(!mgmt))
666                 return NULL;
667
668         if (WARN_ON(!wiphy))
669                 return NULL;
670
671         if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
672                     (signal < 0 || signal > 100)))
673                 return NULL;
674
675         if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
676                 return NULL;
677
678         privsz = wiphy->bss_priv_size;
679
680         res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
681         if (!res)
682                 return NULL;
683
684         memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
685         res->pub.channel = channel;
686         res->pub.signal = signal;
687         res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
688         res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
689         res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
690         /*
691          * The initial buffer for the IEs is allocated with the BSS entry and
692          * is located after the private area.
693          */
694         if (ieee80211_is_probe_resp(mgmt->frame_control)) {
695                 res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz;
696                 memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable,
697                        ielen);
698                 res->pub.len_proberesp_ies = ielen;
699                 res->pub.information_elements = res->pub.proberesp_ies;
700                 res->pub.len_information_elements = res->pub.len_proberesp_ies;
701         } else {
702                 res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz;
703                 memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen);
704                 res->pub.len_beacon_ies = ielen;
705                 res->pub.information_elements = res->pub.beacon_ies;
706                 res->pub.len_information_elements = res->pub.len_beacon_ies;
707         }
708
709         kref_init(&res->ref);
710
711         res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
712         if (!res)
713                 return NULL;
714
715         if (res->pub.capability & WLAN_CAPABILITY_ESS)
716                 regulatory_hint_found_beacon(wiphy, channel, gfp);
717
718         /* cfg80211_bss_update gives us a referenced result */
719         return &res->pub;
720 }
721 EXPORT_SYMBOL(cfg80211_inform_bss_frame);
722
723 void cfg80211_put_bss(struct cfg80211_bss *pub)
724 {
725         struct cfg80211_internal_bss *bss;
726
727         if (!pub)
728                 return;
729
730         bss = container_of(pub, struct cfg80211_internal_bss, pub);
731         kref_put(&bss->ref, bss_release);
732 }
733 EXPORT_SYMBOL(cfg80211_put_bss);
734
735 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
736 {
737         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
738         struct cfg80211_internal_bss *bss;
739
740         if (WARN_ON(!pub))
741                 return;
742
743         bss = container_of(pub, struct cfg80211_internal_bss, pub);
744
745         spin_lock_bh(&dev->bss_lock);
746         if (!list_empty(&bss->list)) {
747                 __cfg80211_unlink_bss(dev, bss);
748                 dev->bss_generation++;
749         }
750         spin_unlock_bh(&dev->bss_lock);
751 }
752 EXPORT_SYMBOL(cfg80211_unlink_bss);
753
754 #ifdef CONFIG_CFG80211_WEXT
755 int cfg80211_wext_siwscan(struct net_device *dev,
756                           struct iw_request_info *info,
757                           union iwreq_data *wrqu, char *extra)
758 {
759         struct cfg80211_registered_device *rdev;
760         struct wiphy *wiphy;
761         struct iw_scan_req *wreq = NULL;
762         struct cfg80211_scan_request *creq = NULL;
763         int i, err, n_channels = 0;
764         enum ieee80211_band band;
765
766         if (!netif_running(dev))
767                 return -ENETDOWN;
768
769         if (wrqu->data.length == sizeof(struct iw_scan_req))
770                 wreq = (struct iw_scan_req *)extra;
771
772         rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
773
774         if (IS_ERR(rdev))
775                 return PTR_ERR(rdev);
776
777         if (rdev->scan_req) {
778                 err = -EBUSY;
779                 goto out;
780         }
781
782         wiphy = &rdev->wiphy;
783
784         /* Determine number of channels, needed to allocate creq */
785         if (wreq && wreq->num_channels)
786                 n_channels = wreq->num_channels;
787         else {
788                 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
789                         if (wiphy->bands[band])
790                                 n_channels += wiphy->bands[band]->n_channels;
791         }
792
793         creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
794                        n_channels * sizeof(void *),
795                        GFP_ATOMIC);
796         if (!creq) {
797                 err = -ENOMEM;
798                 goto out;
799         }
800
801         creq->wiphy = wiphy;
802         creq->dev = dev;
803         /* SSIDs come after channels */
804         creq->ssids = (void *)&creq->channels[n_channels];
805         creq->n_channels = n_channels;
806         creq->n_ssids = 1;
807
808         /* translate "Scan on frequencies" request */
809         i = 0;
810         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
811                 int j;
812
813                 if (!wiphy->bands[band])
814                         continue;
815
816                 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
817                         /* ignore disabled channels */
818                         if (wiphy->bands[band]->channels[j].flags &
819                                                 IEEE80211_CHAN_DISABLED)
820                                 continue;
821
822                         /* If we have a wireless request structure and the
823                          * wireless request specifies frequencies, then search
824                          * for the matching hardware channel.
825                          */
826                         if (wreq && wreq->num_channels) {
827                                 int k;
828                                 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
829                                 for (k = 0; k < wreq->num_channels; k++) {
830                                         int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]);
831                                         if (wext_freq == wiphy_freq)
832                                                 goto wext_freq_found;
833                                 }
834                                 goto wext_freq_not_found;
835                         }
836
837                 wext_freq_found:
838                         creq->channels[i] = &wiphy->bands[band]->channels[j];
839                         i++;
840                 wext_freq_not_found: ;
841                 }
842         }
843         /* No channels found? */
844         if (!i) {
845                 err = -EINVAL;
846                 goto out;
847         }
848
849         /* Set real number of channels specified in creq->channels[] */
850         creq->n_channels = i;
851
852         /* translate "Scan for SSID" request */
853         if (wreq) {
854                 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
855                         if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
856                                 err = -EINVAL;
857                                 goto out;
858                         }
859                         memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
860                         creq->ssids[0].ssid_len = wreq->essid_len;
861                 }
862                 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
863                         creq->n_ssids = 0;
864         }
865
866         rdev->scan_req = creq;
867         err = rdev->ops->scan(wiphy, dev, creq);
868         if (err) {
869                 rdev->scan_req = NULL;
870                 /* creq will be freed below */
871         } else {
872                 nl80211_send_scan_start(rdev, dev);
873                 /* creq now owned by driver */
874                 creq = NULL;
875                 dev_hold(dev);
876         }
877  out:
878         kfree(creq);
879         cfg80211_unlock_rdev(rdev);
880         return err;
881 }
882 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
883
884 static void ieee80211_scan_add_ies(struct iw_request_info *info,
885                                    struct cfg80211_bss *bss,
886                                    char **current_ev, char *end_buf)
887 {
888         u8 *pos, *end, *next;
889         struct iw_event iwe;
890
891         if (!bss->information_elements ||
892             !bss->len_information_elements)
893                 return;
894
895         /*
896          * If needed, fragment the IEs buffer (at IE boundaries) into short
897          * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
898          */
899         pos = bss->information_elements;
900         end = pos + bss->len_information_elements;
901
902         while (end - pos > IW_GENERIC_IE_MAX) {
903                 next = pos + 2 + pos[1];
904                 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
905                         next = next + 2 + next[1];
906
907                 memset(&iwe, 0, sizeof(iwe));
908                 iwe.cmd = IWEVGENIE;
909                 iwe.u.data.length = next - pos;
910                 *current_ev = iwe_stream_add_point(info, *current_ev,
911                                                    end_buf, &iwe, pos);
912
913                 pos = next;
914         }
915
916         if (end > pos) {
917                 memset(&iwe, 0, sizeof(iwe));
918                 iwe.cmd = IWEVGENIE;
919                 iwe.u.data.length = end - pos;
920                 *current_ev = iwe_stream_add_point(info, *current_ev,
921                                                    end_buf, &iwe, pos);
922         }
923 }
924
925 static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
926 {
927         unsigned long end = jiffies;
928
929         if (end >= start)
930                 return jiffies_to_msecs(end - start);
931
932         return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
933 }
934
935 static char *
936 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
937               struct cfg80211_internal_bss *bss, char *current_ev,
938               char *end_buf)
939 {
940         struct iw_event iwe;
941         u8 *buf, *cfg, *p;
942         u8 *ie = bss->pub.information_elements;
943         int rem = bss->pub.len_information_elements, i, sig;
944         bool ismesh = false;
945
946         memset(&iwe, 0, sizeof(iwe));
947         iwe.cmd = SIOCGIWAP;
948         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
949         memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
950         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
951                                           IW_EV_ADDR_LEN);
952
953         memset(&iwe, 0, sizeof(iwe));
954         iwe.cmd = SIOCGIWFREQ;
955         iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
956         iwe.u.freq.e = 0;
957         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
958                                           IW_EV_FREQ_LEN);
959
960         memset(&iwe, 0, sizeof(iwe));
961         iwe.cmd = SIOCGIWFREQ;
962         iwe.u.freq.m = bss->pub.channel->center_freq;
963         iwe.u.freq.e = 6;
964         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
965                                           IW_EV_FREQ_LEN);
966
967         if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
968                 memset(&iwe, 0, sizeof(iwe));
969                 iwe.cmd = IWEVQUAL;
970                 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
971                                      IW_QUAL_NOISE_INVALID |
972                                      IW_QUAL_QUAL_UPDATED;
973                 switch (wiphy->signal_type) {
974                 case CFG80211_SIGNAL_TYPE_MBM:
975                         sig = bss->pub.signal / 100;
976                         iwe.u.qual.level = sig;
977                         iwe.u.qual.updated |= IW_QUAL_DBM;
978                         if (sig < -110)         /* rather bad */
979                                 sig = -110;
980                         else if (sig > -40)     /* perfect */
981                                 sig = -40;
982                         /* will give a range of 0 .. 70 */
983                         iwe.u.qual.qual = sig + 110;
984                         break;
985                 case CFG80211_SIGNAL_TYPE_UNSPEC:
986                         iwe.u.qual.level = bss->pub.signal;
987                         /* will give range 0 .. 100 */
988                         iwe.u.qual.qual = bss->pub.signal;
989                         break;
990                 default:
991                         /* not reached */
992                         break;
993                 }
994                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
995                                                   &iwe, IW_EV_QUAL_LEN);
996         }
997
998         memset(&iwe, 0, sizeof(iwe));
999         iwe.cmd = SIOCGIWENCODE;
1000         if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
1001                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1002         else
1003                 iwe.u.data.flags = IW_ENCODE_DISABLED;
1004         iwe.u.data.length = 0;
1005         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1006                                           &iwe, "");
1007
1008         while (rem >= 2) {
1009                 /* invalid data */
1010                 if (ie[1] > rem - 2)
1011                         break;
1012
1013                 switch (ie[0]) {
1014                 case WLAN_EID_SSID:
1015                         memset(&iwe, 0, sizeof(iwe));
1016                         iwe.cmd = SIOCGIWESSID;
1017                         iwe.u.data.length = ie[1];
1018                         iwe.u.data.flags = 1;
1019                         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1020                                                           &iwe, ie + 2);
1021                         break;
1022                 case WLAN_EID_MESH_ID:
1023                         memset(&iwe, 0, sizeof(iwe));
1024                         iwe.cmd = SIOCGIWESSID;
1025                         iwe.u.data.length = ie[1];
1026                         iwe.u.data.flags = 1;
1027                         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1028                                                           &iwe, ie + 2);
1029                         break;
1030                 case WLAN_EID_MESH_CONFIG:
1031                         ismesh = true;
1032                         if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
1033                                 break;
1034                         buf = kmalloc(50, GFP_ATOMIC);
1035                         if (!buf)
1036                                 break;
1037                         cfg = ie + 2;
1038                         memset(&iwe, 0, sizeof(iwe));
1039                         iwe.cmd = IWEVCUSTOM;
1040                         sprintf(buf, "Mesh Network Path Selection Protocol ID: "
1041                                 "0x%02X", cfg[0]);
1042                         iwe.u.data.length = strlen(buf);
1043                         current_ev = iwe_stream_add_point(info, current_ev,
1044                                                           end_buf,
1045                                                           &iwe, buf);
1046                         sprintf(buf, "Path Selection Metric ID: 0x%02X",
1047                                 cfg[1]);
1048                         iwe.u.data.length = strlen(buf);
1049                         current_ev = iwe_stream_add_point(info, current_ev,
1050                                                           end_buf,
1051                                                           &iwe, buf);
1052                         sprintf(buf, "Congestion Control Mode ID: 0x%02X",
1053                                 cfg[2]);
1054                         iwe.u.data.length = strlen(buf);
1055                         current_ev = iwe_stream_add_point(info, current_ev,
1056                                                           end_buf,
1057                                                           &iwe, buf);
1058                         sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
1059                         iwe.u.data.length = strlen(buf);
1060                         current_ev = iwe_stream_add_point(info, current_ev,
1061                                                           end_buf,
1062                                                           &iwe, buf);
1063                         sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
1064                         iwe.u.data.length = strlen(buf);
1065                         current_ev = iwe_stream_add_point(info, current_ev,
1066                                                           end_buf,
1067                                                           &iwe, buf);
1068                         sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
1069                         iwe.u.data.length = strlen(buf);
1070                         current_ev = iwe_stream_add_point(info, current_ev,
1071                                                           end_buf,
1072                                                           &iwe, buf);
1073                         sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
1074                         iwe.u.data.length = strlen(buf);
1075                         current_ev = iwe_stream_add_point(info, current_ev,
1076                                                           end_buf,
1077                                                           &iwe, buf);
1078                         kfree(buf);
1079                         break;
1080                 case WLAN_EID_SUPP_RATES:
1081                 case WLAN_EID_EXT_SUPP_RATES:
1082                         /* display all supported rates in readable format */
1083                         p = current_ev + iwe_stream_lcp_len(info);
1084
1085                         memset(&iwe, 0, sizeof(iwe));
1086                         iwe.cmd = SIOCGIWRATE;
1087                         /* Those two flags are ignored... */
1088                         iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
1089
1090                         for (i = 0; i < ie[1]; i++) {
1091                                 iwe.u.bitrate.value =
1092                                         ((ie[i + 2] & 0x7f) * 500000);
1093                                 p = iwe_stream_add_value(info, current_ev, p,
1094                                                 end_buf, &iwe, IW_EV_PARAM_LEN);
1095                         }
1096                         current_ev = p;
1097                         break;
1098                 }
1099                 rem -= ie[1] + 2;
1100                 ie += ie[1] + 2;
1101         }
1102
1103         if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
1104             ismesh) {
1105                 memset(&iwe, 0, sizeof(iwe));
1106                 iwe.cmd = SIOCGIWMODE;
1107                 if (ismesh)
1108                         iwe.u.mode = IW_MODE_MESH;
1109                 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
1110                         iwe.u.mode = IW_MODE_MASTER;
1111                 else
1112                         iwe.u.mode = IW_MODE_ADHOC;
1113                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1114                                                   &iwe, IW_EV_UINT_LEN);
1115         }
1116
1117         buf = kmalloc(30, GFP_ATOMIC);
1118         if (buf) {
1119                 memset(&iwe, 0, sizeof(iwe));
1120                 iwe.cmd = IWEVCUSTOM;
1121                 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
1122                 iwe.u.data.length = strlen(buf);
1123                 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1124                                                   &iwe, buf);
1125                 memset(&iwe, 0, sizeof(iwe));
1126                 iwe.cmd = IWEVCUSTOM;
1127                 sprintf(buf, " Last beacon: %ums ago",
1128                         elapsed_jiffies_msecs(bss->ts));
1129                 iwe.u.data.length = strlen(buf);
1130                 current_ev = iwe_stream_add_point(info, current_ev,
1131                                                   end_buf, &iwe, buf);
1132                 kfree(buf);
1133         }
1134
1135         ieee80211_scan_add_ies(info, &bss->pub, &current_ev, end_buf);
1136
1137         return current_ev;
1138 }
1139
1140
1141 static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
1142                                   struct iw_request_info *info,
1143                                   char *buf, size_t len)
1144 {
1145         char *current_ev = buf;
1146         char *end_buf = buf + len;
1147         struct cfg80211_internal_bss *bss;
1148
1149         spin_lock_bh(&dev->bss_lock);
1150         cfg80211_bss_expire(dev);
1151
1152         list_for_each_entry(bss, &dev->bss_list, list) {
1153                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
1154                         spin_unlock_bh(&dev->bss_lock);
1155                         return -E2BIG;
1156                 }
1157                 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
1158                                            current_ev, end_buf);
1159         }
1160         spin_unlock_bh(&dev->bss_lock);
1161         return current_ev - buf;
1162 }
1163
1164
1165 int cfg80211_wext_giwscan(struct net_device *dev,
1166                           struct iw_request_info *info,
1167                           struct iw_point *data, char *extra)
1168 {
1169         struct cfg80211_registered_device *rdev;
1170         int res;
1171
1172         if (!netif_running(dev))
1173                 return -ENETDOWN;
1174
1175         rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1176
1177         if (IS_ERR(rdev))
1178                 return PTR_ERR(rdev);
1179
1180         if (rdev->scan_req) {
1181                 res = -EAGAIN;
1182                 goto out;
1183         }
1184
1185         res = ieee80211_scan_results(rdev, info, extra, data->length);
1186         data->length = 0;
1187         if (res >= 0) {
1188                 data->length = res;
1189                 res = 0;
1190         }
1191
1192  out:
1193         cfg80211_unlock_rdev(rdev);
1194         return res;
1195 }
1196 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);
1197 #endif