Merge branch 'for-3.2-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj...
[pandora-kernel.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
21 #define IEEE80211_SCAN_RESULT_EXPIRE    (15 * HZ)
22
23 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak)
24 {
25         struct cfg80211_scan_request *request;
26         struct net_device *dev;
27 #ifdef CONFIG_CFG80211_WEXT
28         union iwreq_data wrqu;
29 #endif
30
31         ASSERT_RDEV_LOCK(rdev);
32
33         request = rdev->scan_req;
34
35         if (!request)
36                 return;
37
38         dev = request->dev;
39
40         /*
41          * This must be before sending the other events!
42          * Otherwise, wpa_supplicant gets completely confused with
43          * wext events.
44          */
45         cfg80211_sme_scan_done(dev);
46
47         if (request->aborted)
48                 nl80211_send_scan_aborted(rdev, dev);
49         else
50                 nl80211_send_scan_done(rdev, dev);
51
52 #ifdef CONFIG_CFG80211_WEXT
53         if (!request->aborted) {
54                 memset(&wrqu, 0, sizeof(wrqu));
55
56                 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
57         }
58 #endif
59
60         dev_put(dev);
61
62         rdev->scan_req = NULL;
63
64         /*
65          * OK. If this is invoked with "leak" then we can't
66          * free this ... but we've cleaned it up anyway. The
67          * driver failed to call the scan_done callback, so
68          * all bets are off, it might still be trying to use
69          * the scan request or not ... if it accesses the dev
70          * in there (it shouldn't anyway) then it may crash.
71          */
72         if (!leak)
73                 kfree(request);
74 }
75
76 void __cfg80211_scan_done(struct work_struct *wk)
77 {
78         struct cfg80211_registered_device *rdev;
79
80         rdev = container_of(wk, struct cfg80211_registered_device,
81                             scan_done_wk);
82
83         cfg80211_lock_rdev(rdev);
84         ___cfg80211_scan_done(rdev, false);
85         cfg80211_unlock_rdev(rdev);
86 }
87
88 void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
89 {
90         WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);
91
92         request->aborted = aborted;
93         queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk);
94 }
95 EXPORT_SYMBOL(cfg80211_scan_done);
96
97 void __cfg80211_sched_scan_results(struct work_struct *wk)
98 {
99         struct cfg80211_registered_device *rdev;
100
101         rdev = container_of(wk, struct cfg80211_registered_device,
102                             sched_scan_results_wk);
103
104         mutex_lock(&rdev->sched_scan_mtx);
105
106         /* we don't have sched_scan_req anymore if the scan is stopping */
107         if (rdev->sched_scan_req)
108                 nl80211_send_sched_scan_results(rdev,
109                                                 rdev->sched_scan_req->dev);
110
111         mutex_unlock(&rdev->sched_scan_mtx);
112 }
113
114 void cfg80211_sched_scan_results(struct wiphy *wiphy)
115 {
116         /* ignore if we're not scanning */
117         if (wiphy_to_dev(wiphy)->sched_scan_req)
118                 queue_work(cfg80211_wq,
119                            &wiphy_to_dev(wiphy)->sched_scan_results_wk);
120 }
121 EXPORT_SYMBOL(cfg80211_sched_scan_results);
122
123 void cfg80211_sched_scan_stopped(struct wiphy *wiphy)
124 {
125         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
126
127         mutex_lock(&rdev->sched_scan_mtx);
128         __cfg80211_stop_sched_scan(rdev, true);
129         mutex_unlock(&rdev->sched_scan_mtx);
130 }
131 EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
132
133 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
134                                bool driver_initiated)
135 {
136         struct net_device *dev;
137
138         lockdep_assert_held(&rdev->sched_scan_mtx);
139
140         if (!rdev->sched_scan_req)
141                 return -ENOENT;
142
143         dev = rdev->sched_scan_req->dev;
144
145         if (!driver_initiated) {
146                 int 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 0;
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 const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type,
232                                   const u8 *ies, int len)
233 {
234         struct ieee80211_vendor_ie *ie;
235         const u8 *pos = ies, *end = ies + len;
236         int ie_oui;
237
238         while (pos < end) {
239                 pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos,
240                                        end - pos);
241                 if (!pos)
242                         return NULL;
243
244                 if (end - pos < sizeof(*ie))
245                         return NULL;
246
247                 ie = (struct ieee80211_vendor_ie *)pos;
248                 ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2];
249                 if (ie_oui == oui && ie->oui_type == oui_type)
250                         return pos;
251
252                 pos += 2 + ie->len;
253         }
254         return NULL;
255 }
256 EXPORT_SYMBOL(cfg80211_find_vendor_ie);
257
258 static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
259 {
260         const u8 *ie1 = cfg80211_find_ie(num, ies1, len1);
261         const u8 *ie2 = cfg80211_find_ie(num, ies2, len2);
262
263         /* equal if both missing */
264         if (!ie1 && !ie2)
265                 return 0;
266         /* sort missing IE before (left of) present IE */
267         if (!ie1)
268                 return -1;
269         if (!ie2)
270                 return 1;
271
272         /* sort by length first, then by contents */
273         if (ie1[1] != ie2[1])
274                 return ie2[1] - ie1[1];
275         return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
276 }
277
278 static bool is_bss(struct cfg80211_bss *a,
279                    const u8 *bssid,
280                    const u8 *ssid, size_t ssid_len)
281 {
282         const u8 *ssidie;
283
284         if (bssid && compare_ether_addr(a->bssid, bssid))
285                 return false;
286
287         if (!ssid)
288                 return true;
289
290         ssidie = cfg80211_find_ie(WLAN_EID_SSID,
291                                   a->information_elements,
292                                   a->len_information_elements);
293         if (!ssidie)
294                 return false;
295         if (ssidie[1] != ssid_len)
296                 return false;
297         return memcmp(ssidie + 2, ssid, ssid_len) == 0;
298 }
299
300 static bool is_mesh_bss(struct cfg80211_bss *a)
301 {
302         const u8 *ie;
303
304         if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
305                 return false;
306
307         ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
308                               a->information_elements,
309                               a->len_information_elements);
310         if (!ie)
311                 return false;
312
313         ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
314                               a->information_elements,
315                               a->len_information_elements);
316         if (!ie)
317                 return false;
318
319         return true;
320 }
321
322 static bool is_mesh(struct cfg80211_bss *a,
323                     const u8 *meshid, size_t meshidlen,
324                     const u8 *meshcfg)
325 {
326         const u8 *ie;
327
328         if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
329                 return false;
330
331         ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
332                               a->information_elements,
333                               a->len_information_elements);
334         if (!ie)
335                 return false;
336         if (ie[1] != meshidlen)
337                 return false;
338         if (memcmp(ie + 2, meshid, meshidlen))
339                 return false;
340
341         ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
342                               a->information_elements,
343                               a->len_information_elements);
344         if (!ie)
345                 return false;
346         if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
347                 return false;
348
349         /*
350          * Ignore mesh capability (last two bytes of the IE) when
351          * comparing since that may differ between stations taking
352          * part in the same mesh.
353          */
354         return memcmp(ie + 2, meshcfg,
355             sizeof(struct ieee80211_meshconf_ie) - 2) == 0;
356 }
357
358 static int cmp_bss(struct cfg80211_bss *a,
359                    struct cfg80211_bss *b)
360 {
361         int r;
362
363         if (a->channel != b->channel)
364                 return b->channel->center_freq - a->channel->center_freq;
365
366         if (is_mesh_bss(a) && is_mesh_bss(b)) {
367                 r = cmp_ies(WLAN_EID_MESH_ID,
368                             a->information_elements,
369                             a->len_information_elements,
370                             b->information_elements,
371                             b->len_information_elements);
372                 if (r)
373                         return r;
374                 return cmp_ies(WLAN_EID_MESH_CONFIG,
375                                a->information_elements,
376                                a->len_information_elements,
377                                b->information_elements,
378                                b->len_information_elements);
379         }
380
381         r = memcmp(a->bssid, b->bssid, ETH_ALEN);
382         if (r)
383                 return r;
384
385         return cmp_ies(WLAN_EID_SSID,
386                        a->information_elements,
387                        a->len_information_elements,
388                        b->information_elements,
389                        b->len_information_elements);
390 }
391
392 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
393                                       struct ieee80211_channel *channel,
394                                       const u8 *bssid,
395                                       const u8 *ssid, size_t ssid_len,
396                                       u16 capa_mask, u16 capa_val)
397 {
398         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
399         struct cfg80211_internal_bss *bss, *res = NULL;
400         unsigned long now = jiffies;
401
402         spin_lock_bh(&dev->bss_lock);
403
404         list_for_each_entry(bss, &dev->bss_list, list) {
405                 if ((bss->pub.capability & capa_mask) != capa_val)
406                         continue;
407                 if (channel && bss->pub.channel != channel)
408                         continue;
409                 /* Don't get expired BSS structs */
410                 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
411                     !atomic_read(&bss->hold))
412                         continue;
413                 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
414                         res = bss;
415                         kref_get(&res->ref);
416                         break;
417                 }
418         }
419
420         spin_unlock_bh(&dev->bss_lock);
421         if (!res)
422                 return NULL;
423         return &res->pub;
424 }
425 EXPORT_SYMBOL(cfg80211_get_bss);
426
427 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
428                                        struct ieee80211_channel *channel,
429                                        const u8 *meshid, size_t meshidlen,
430                                        const u8 *meshcfg)
431 {
432         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
433         struct cfg80211_internal_bss *bss, *res = NULL;
434
435         spin_lock_bh(&dev->bss_lock);
436
437         list_for_each_entry(bss, &dev->bss_list, list) {
438                 if (channel && bss->pub.channel != channel)
439                         continue;
440                 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
441                         res = bss;
442                         kref_get(&res->ref);
443                         break;
444                 }
445         }
446
447         spin_unlock_bh(&dev->bss_lock);
448         if (!res)
449                 return NULL;
450         return &res->pub;
451 }
452 EXPORT_SYMBOL(cfg80211_get_mesh);
453
454
455 static void rb_insert_bss(struct cfg80211_registered_device *dev,
456                           struct cfg80211_internal_bss *bss)
457 {
458         struct rb_node **p = &dev->bss_tree.rb_node;
459         struct rb_node *parent = NULL;
460         struct cfg80211_internal_bss *tbss;
461         int cmp;
462
463         while (*p) {
464                 parent = *p;
465                 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
466
467                 cmp = cmp_bss(&bss->pub, &tbss->pub);
468
469                 if (WARN_ON(!cmp)) {
470                         /* will sort of leak this BSS */
471                         return;
472                 }
473
474                 if (cmp < 0)
475                         p = &(*p)->rb_left;
476                 else
477                         p = &(*p)->rb_right;
478         }
479
480         rb_link_node(&bss->rbn, parent, p);
481         rb_insert_color(&bss->rbn, &dev->bss_tree);
482 }
483
484 static struct cfg80211_internal_bss *
485 rb_find_bss(struct cfg80211_registered_device *dev,
486             struct cfg80211_internal_bss *res)
487 {
488         struct rb_node *n = dev->bss_tree.rb_node;
489         struct cfg80211_internal_bss *bss;
490         int r;
491
492         while (n) {
493                 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
494                 r = cmp_bss(&res->pub, &bss->pub);
495
496                 if (r == 0)
497                         return bss;
498                 else if (r < 0)
499                         n = n->rb_left;
500                 else
501                         n = n->rb_right;
502         }
503
504         return NULL;
505 }
506
507 static struct cfg80211_internal_bss *
508 cfg80211_bss_update(struct cfg80211_registered_device *dev,
509                     struct cfg80211_internal_bss *res)
510 {
511         struct cfg80211_internal_bss *found = NULL;
512
513         /*
514          * The reference to "res" is donated to this function.
515          */
516
517         if (WARN_ON(!res->pub.channel)) {
518                 kref_put(&res->ref, bss_release);
519                 return NULL;
520         }
521
522         res->ts = jiffies;
523
524         spin_lock_bh(&dev->bss_lock);
525
526         found = rb_find_bss(dev, res);
527
528         if (found) {
529                 found->pub.beacon_interval = res->pub.beacon_interval;
530                 found->pub.tsf = res->pub.tsf;
531                 found->pub.signal = res->pub.signal;
532                 found->pub.capability = res->pub.capability;
533                 found->ts = res->ts;
534
535                 /* Update IEs */
536                 if (res->pub.proberesp_ies) {
537                         size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
538                         size_t ielen = res->pub.len_proberesp_ies;
539
540                         if (found->pub.proberesp_ies &&
541                             !found->proberesp_ies_allocated &&
542                             ksize(found) >= used + ielen) {
543                                 memcpy(found->pub.proberesp_ies,
544                                        res->pub.proberesp_ies, ielen);
545                                 found->pub.len_proberesp_ies = ielen;
546                         } else {
547                                 u8 *ies = found->pub.proberesp_ies;
548
549                                 if (found->proberesp_ies_allocated)
550                                         ies = krealloc(ies, ielen, GFP_ATOMIC);
551                                 else
552                                         ies = kmalloc(ielen, GFP_ATOMIC);
553
554                                 if (ies) {
555                                         memcpy(ies, res->pub.proberesp_ies,
556                                                ielen);
557                                         found->proberesp_ies_allocated = true;
558                                         found->pub.proberesp_ies = ies;
559                                         found->pub.len_proberesp_ies = ielen;
560                                 }
561                         }
562
563                         /* Override possible earlier Beacon frame IEs */
564                         found->pub.information_elements =
565                                 found->pub.proberesp_ies;
566                         found->pub.len_information_elements =
567                                 found->pub.len_proberesp_ies;
568                 }
569                 if (res->pub.beacon_ies) {
570                         size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
571                         size_t ielen = res->pub.len_beacon_ies;
572                         bool information_elements_is_beacon_ies =
573                                 (found->pub.information_elements ==
574                                  found->pub.beacon_ies);
575
576                         if (found->pub.beacon_ies &&
577                             !found->beacon_ies_allocated &&
578                             ksize(found) >= used + ielen) {
579                                 memcpy(found->pub.beacon_ies,
580                                        res->pub.beacon_ies, ielen);
581                                 found->pub.len_beacon_ies = ielen;
582                         } else {
583                                 u8 *ies = found->pub.beacon_ies;
584
585                                 if (found->beacon_ies_allocated)
586                                         ies = krealloc(ies, ielen, GFP_ATOMIC);
587                                 else
588                                         ies = kmalloc(ielen, GFP_ATOMIC);
589
590                                 if (ies) {
591                                         memcpy(ies, res->pub.beacon_ies,
592                                                ielen);
593                                         found->beacon_ies_allocated = true;
594                                         found->pub.beacon_ies = ies;
595                                         found->pub.len_beacon_ies = ielen;
596                                 }
597                         }
598
599                         /* Override IEs if they were from a beacon before */
600                         if (information_elements_is_beacon_ies) {
601                                 found->pub.information_elements =
602                                         found->pub.beacon_ies;
603                                 found->pub.len_information_elements =
604                                         found->pub.len_beacon_ies;
605                         }
606                 }
607
608                 kref_put(&res->ref, bss_release);
609         } else {
610                 /* this "consumes" the reference */
611                 list_add_tail(&res->list, &dev->bss_list);
612                 rb_insert_bss(dev, res);
613                 found = res;
614         }
615
616         dev->bss_generation++;
617         spin_unlock_bh(&dev->bss_lock);
618
619         kref_get(&found->ref);
620         return found;
621 }
622
623 struct cfg80211_bss*
624 cfg80211_inform_bss(struct wiphy *wiphy,
625                     struct ieee80211_channel *channel,
626                     const u8 *bssid,
627                     u64 timestamp, u16 capability, u16 beacon_interval,
628                     const u8 *ie, size_t ielen,
629                     s32 signal, gfp_t gfp)
630 {
631         struct cfg80211_internal_bss *res;
632         size_t privsz;
633
634         if (WARN_ON(!wiphy))
635                 return NULL;
636
637         privsz = wiphy->bss_priv_size;
638
639         if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
640                         (signal < 0 || signal > 100)))
641                 return NULL;
642
643         res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
644         if (!res)
645                 return NULL;
646
647         memcpy(res->pub.bssid, bssid, ETH_ALEN);
648         res->pub.channel = channel;
649         res->pub.signal = signal;
650         res->pub.tsf = timestamp;
651         res->pub.beacon_interval = beacon_interval;
652         res->pub.capability = capability;
653         /*
654          * Since we do not know here whether the IEs are from a Beacon or Probe
655          * Response frame, we need to pick one of the options and only use it
656          * with the driver that does not provide the full Beacon/Probe Response
657          * frame. Use Beacon frame pointer to avoid indicating that this should
658          * override the information_elements pointer should we have received an
659          * earlier indication of Probe Response data.
660          *
661          * The initial buffer for the IEs is allocated with the BSS entry and
662          * is located after the private area.
663          */
664         res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz;
665         memcpy(res->pub.beacon_ies, ie, ielen);
666         res->pub.len_beacon_ies = ielen;
667         res->pub.information_elements = res->pub.beacon_ies;
668         res->pub.len_information_elements = res->pub.len_beacon_ies;
669
670         kref_init(&res->ref);
671
672         res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
673         if (!res)
674                 return NULL;
675
676         if (res->pub.capability & WLAN_CAPABILITY_ESS)
677                 regulatory_hint_found_beacon(wiphy, channel, gfp);
678
679         /* cfg80211_bss_update gives us a referenced result */
680         return &res->pub;
681 }
682 EXPORT_SYMBOL(cfg80211_inform_bss);
683
684 struct cfg80211_bss *
685 cfg80211_inform_bss_frame(struct wiphy *wiphy,
686                           struct ieee80211_channel *channel,
687                           struct ieee80211_mgmt *mgmt, size_t len,
688                           s32 signal, gfp_t gfp)
689 {
690         struct cfg80211_internal_bss *res;
691         size_t ielen = len - offsetof(struct ieee80211_mgmt,
692                                       u.probe_resp.variable);
693         size_t privsz;
694
695         if (WARN_ON(!mgmt))
696                 return NULL;
697
698         if (WARN_ON(!wiphy))
699                 return NULL;
700
701         if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
702                     (signal < 0 || signal > 100)))
703                 return NULL;
704
705         if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
706                 return NULL;
707
708         privsz = wiphy->bss_priv_size;
709
710         res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
711         if (!res)
712                 return NULL;
713
714         memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
715         res->pub.channel = channel;
716         res->pub.signal = signal;
717         res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
718         res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
719         res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
720         /*
721          * The initial buffer for the IEs is allocated with the BSS entry and
722          * is located after the private area.
723          */
724         if (ieee80211_is_probe_resp(mgmt->frame_control)) {
725                 res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz;
726                 memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable,
727                        ielen);
728                 res->pub.len_proberesp_ies = ielen;
729                 res->pub.information_elements = res->pub.proberesp_ies;
730                 res->pub.len_information_elements = res->pub.len_proberesp_ies;
731         } else {
732                 res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz;
733                 memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen);
734                 res->pub.len_beacon_ies = ielen;
735                 res->pub.information_elements = res->pub.beacon_ies;
736                 res->pub.len_information_elements = res->pub.len_beacon_ies;
737         }
738
739         kref_init(&res->ref);
740
741         res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
742         if (!res)
743                 return NULL;
744
745         if (res->pub.capability & WLAN_CAPABILITY_ESS)
746                 regulatory_hint_found_beacon(wiphy, channel, gfp);
747
748         /* cfg80211_bss_update gives us a referenced result */
749         return &res->pub;
750 }
751 EXPORT_SYMBOL(cfg80211_inform_bss_frame);
752
753 void cfg80211_put_bss(struct cfg80211_bss *pub)
754 {
755         struct cfg80211_internal_bss *bss;
756
757         if (!pub)
758                 return;
759
760         bss = container_of(pub, struct cfg80211_internal_bss, pub);
761         kref_put(&bss->ref, bss_release);
762 }
763 EXPORT_SYMBOL(cfg80211_put_bss);
764
765 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
766 {
767         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
768         struct cfg80211_internal_bss *bss;
769
770         if (WARN_ON(!pub))
771                 return;
772
773         bss = container_of(pub, struct cfg80211_internal_bss, pub);
774
775         spin_lock_bh(&dev->bss_lock);
776         if (!list_empty(&bss->list)) {
777                 __cfg80211_unlink_bss(dev, bss);
778                 dev->bss_generation++;
779         }
780         spin_unlock_bh(&dev->bss_lock);
781 }
782 EXPORT_SYMBOL(cfg80211_unlink_bss);
783
784 #ifdef CONFIG_CFG80211_WEXT
785 int cfg80211_wext_siwscan(struct net_device *dev,
786                           struct iw_request_info *info,
787                           union iwreq_data *wrqu, char *extra)
788 {
789         struct cfg80211_registered_device *rdev;
790         struct wiphy *wiphy;
791         struct iw_scan_req *wreq = NULL;
792         struct cfg80211_scan_request *creq = NULL;
793         int i, err, n_channels = 0;
794         enum ieee80211_band band;
795
796         if (!netif_running(dev))
797                 return -ENETDOWN;
798
799         if (wrqu->data.length == sizeof(struct iw_scan_req))
800                 wreq = (struct iw_scan_req *)extra;
801
802         rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
803
804         if (IS_ERR(rdev))
805                 return PTR_ERR(rdev);
806
807         if (rdev->scan_req) {
808                 err = -EBUSY;
809                 goto out;
810         }
811
812         wiphy = &rdev->wiphy;
813
814         /* Determine number of channels, needed to allocate creq */
815         if (wreq && wreq->num_channels)
816                 n_channels = wreq->num_channels;
817         else {
818                 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
819                         if (wiphy->bands[band])
820                                 n_channels += wiphy->bands[band]->n_channels;
821         }
822
823         creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
824                        n_channels * sizeof(void *),
825                        GFP_ATOMIC);
826         if (!creq) {
827                 err = -ENOMEM;
828                 goto out;
829         }
830
831         creq->wiphy = wiphy;
832         creq->dev = dev;
833         /* SSIDs come after channels */
834         creq->ssids = (void *)&creq->channels[n_channels];
835         creq->n_channels = n_channels;
836         creq->n_ssids = 1;
837
838         /* translate "Scan on frequencies" request */
839         i = 0;
840         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
841                 int j;
842
843                 if (!wiphy->bands[band])
844                         continue;
845
846                 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
847                         /* ignore disabled channels */
848                         if (wiphy->bands[band]->channels[j].flags &
849                                                 IEEE80211_CHAN_DISABLED)
850                                 continue;
851
852                         /* If we have a wireless request structure and the
853                          * wireless request specifies frequencies, then search
854                          * for the matching hardware channel.
855                          */
856                         if (wreq && wreq->num_channels) {
857                                 int k;
858                                 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
859                                 for (k = 0; k < wreq->num_channels; k++) {
860                                         int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]);
861                                         if (wext_freq == wiphy_freq)
862                                                 goto wext_freq_found;
863                                 }
864                                 goto wext_freq_not_found;
865                         }
866
867                 wext_freq_found:
868                         creq->channels[i] = &wiphy->bands[band]->channels[j];
869                         i++;
870                 wext_freq_not_found: ;
871                 }
872         }
873         /* No channels found? */
874         if (!i) {
875                 err = -EINVAL;
876                 goto out;
877         }
878
879         /* Set real number of channels specified in creq->channels[] */
880         creq->n_channels = i;
881
882         /* translate "Scan for SSID" request */
883         if (wreq) {
884                 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
885                         if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
886                                 err = -EINVAL;
887                                 goto out;
888                         }
889                         memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
890                         creq->ssids[0].ssid_len = wreq->essid_len;
891                 }
892                 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
893                         creq->n_ssids = 0;
894         }
895
896         for (i = 0; i < IEEE80211_NUM_BANDS; i++)
897                 if (wiphy->bands[i])
898                         creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
899
900         rdev->scan_req = creq;
901         err = rdev->ops->scan(wiphy, dev, creq);
902         if (err) {
903                 rdev->scan_req = NULL;
904                 /* creq will be freed below */
905         } else {
906                 nl80211_send_scan_start(rdev, dev);
907                 /* creq now owned by driver */
908                 creq = NULL;
909                 dev_hold(dev);
910         }
911  out:
912         kfree(creq);
913         cfg80211_unlock_rdev(rdev);
914         return err;
915 }
916 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
917
918 static void ieee80211_scan_add_ies(struct iw_request_info *info,
919                                    struct cfg80211_bss *bss,
920                                    char **current_ev, char *end_buf)
921 {
922         u8 *pos, *end, *next;
923         struct iw_event iwe;
924
925         if (!bss->information_elements ||
926             !bss->len_information_elements)
927                 return;
928
929         /*
930          * If needed, fragment the IEs buffer (at IE boundaries) into short
931          * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
932          */
933         pos = bss->information_elements;
934         end = pos + bss->len_information_elements;
935
936         while (end - pos > IW_GENERIC_IE_MAX) {
937                 next = pos + 2 + pos[1];
938                 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
939                         next = next + 2 + next[1];
940
941                 memset(&iwe, 0, sizeof(iwe));
942                 iwe.cmd = IWEVGENIE;
943                 iwe.u.data.length = next - pos;
944                 *current_ev = iwe_stream_add_point(info, *current_ev,
945                                                    end_buf, &iwe, pos);
946
947                 pos = next;
948         }
949
950         if (end > pos) {
951                 memset(&iwe, 0, sizeof(iwe));
952                 iwe.cmd = IWEVGENIE;
953                 iwe.u.data.length = end - pos;
954                 *current_ev = iwe_stream_add_point(info, *current_ev,
955                                                    end_buf, &iwe, pos);
956         }
957 }
958
959 static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
960 {
961         unsigned long end = jiffies;
962
963         if (end >= start)
964                 return jiffies_to_msecs(end - start);
965
966         return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
967 }
968
969 static char *
970 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
971               struct cfg80211_internal_bss *bss, char *current_ev,
972               char *end_buf)
973 {
974         struct iw_event iwe;
975         u8 *buf, *cfg, *p;
976         u8 *ie = bss->pub.information_elements;
977         int rem = bss->pub.len_information_elements, i, sig;
978         bool ismesh = false;
979
980         memset(&iwe, 0, sizeof(iwe));
981         iwe.cmd = SIOCGIWAP;
982         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
983         memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
984         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
985                                           IW_EV_ADDR_LEN);
986
987         memset(&iwe, 0, sizeof(iwe));
988         iwe.cmd = SIOCGIWFREQ;
989         iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
990         iwe.u.freq.e = 0;
991         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
992                                           IW_EV_FREQ_LEN);
993
994         memset(&iwe, 0, sizeof(iwe));
995         iwe.cmd = SIOCGIWFREQ;
996         iwe.u.freq.m = bss->pub.channel->center_freq;
997         iwe.u.freq.e = 6;
998         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
999                                           IW_EV_FREQ_LEN);
1000
1001         if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
1002                 memset(&iwe, 0, sizeof(iwe));
1003                 iwe.cmd = IWEVQUAL;
1004                 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
1005                                      IW_QUAL_NOISE_INVALID |
1006                                      IW_QUAL_QUAL_UPDATED;
1007                 switch (wiphy->signal_type) {
1008                 case CFG80211_SIGNAL_TYPE_MBM:
1009                         sig = bss->pub.signal / 100;
1010                         iwe.u.qual.level = sig;
1011                         iwe.u.qual.updated |= IW_QUAL_DBM;
1012                         if (sig < -110)         /* rather bad */
1013                                 sig = -110;
1014                         else if (sig > -40)     /* perfect */
1015                                 sig = -40;
1016                         /* will give a range of 0 .. 70 */
1017                         iwe.u.qual.qual = sig + 110;
1018                         break;
1019                 case CFG80211_SIGNAL_TYPE_UNSPEC:
1020                         iwe.u.qual.level = bss->pub.signal;
1021                         /* will give range 0 .. 100 */
1022                         iwe.u.qual.qual = bss->pub.signal;
1023                         break;
1024                 default:
1025                         /* not reached */
1026                         break;
1027                 }
1028                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1029                                                   &iwe, IW_EV_QUAL_LEN);
1030         }
1031
1032         memset(&iwe, 0, sizeof(iwe));
1033         iwe.cmd = SIOCGIWENCODE;
1034         if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
1035                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1036         else
1037                 iwe.u.data.flags = IW_ENCODE_DISABLED;
1038         iwe.u.data.length = 0;
1039         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1040                                           &iwe, "");
1041
1042         while (rem >= 2) {
1043                 /* invalid data */
1044                 if (ie[1] > rem - 2)
1045                         break;
1046
1047                 switch (ie[0]) {
1048                 case WLAN_EID_SSID:
1049                         memset(&iwe, 0, sizeof(iwe));
1050                         iwe.cmd = SIOCGIWESSID;
1051                         iwe.u.data.length = ie[1];
1052                         iwe.u.data.flags = 1;
1053                         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1054                                                           &iwe, ie + 2);
1055                         break;
1056                 case WLAN_EID_MESH_ID:
1057                         memset(&iwe, 0, sizeof(iwe));
1058                         iwe.cmd = SIOCGIWESSID;
1059                         iwe.u.data.length = ie[1];
1060                         iwe.u.data.flags = 1;
1061                         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1062                                                           &iwe, ie + 2);
1063                         break;
1064                 case WLAN_EID_MESH_CONFIG:
1065                         ismesh = true;
1066                         if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
1067                                 break;
1068                         buf = kmalloc(50, GFP_ATOMIC);
1069                         if (!buf)
1070                                 break;
1071                         cfg = ie + 2;
1072                         memset(&iwe, 0, sizeof(iwe));
1073                         iwe.cmd = IWEVCUSTOM;
1074                         sprintf(buf, "Mesh Network Path Selection Protocol ID: "
1075                                 "0x%02X", cfg[0]);
1076                         iwe.u.data.length = strlen(buf);
1077                         current_ev = iwe_stream_add_point(info, current_ev,
1078                                                           end_buf,
1079                                                           &iwe, buf);
1080                         sprintf(buf, "Path Selection Metric ID: 0x%02X",
1081                                 cfg[1]);
1082                         iwe.u.data.length = strlen(buf);
1083                         current_ev = iwe_stream_add_point(info, current_ev,
1084                                                           end_buf,
1085                                                           &iwe, buf);
1086                         sprintf(buf, "Congestion Control Mode ID: 0x%02X",
1087                                 cfg[2]);
1088                         iwe.u.data.length = strlen(buf);
1089                         current_ev = iwe_stream_add_point(info, current_ev,
1090                                                           end_buf,
1091                                                           &iwe, buf);
1092                         sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
1093                         iwe.u.data.length = strlen(buf);
1094                         current_ev = iwe_stream_add_point(info, current_ev,
1095                                                           end_buf,
1096                                                           &iwe, buf);
1097                         sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
1098                         iwe.u.data.length = strlen(buf);
1099                         current_ev = iwe_stream_add_point(info, current_ev,
1100                                                           end_buf,
1101                                                           &iwe, buf);
1102                         sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
1103                         iwe.u.data.length = strlen(buf);
1104                         current_ev = iwe_stream_add_point(info, current_ev,
1105                                                           end_buf,
1106                                                           &iwe, buf);
1107                         sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
1108                         iwe.u.data.length = strlen(buf);
1109                         current_ev = iwe_stream_add_point(info, current_ev,
1110                                                           end_buf,
1111                                                           &iwe, buf);
1112                         kfree(buf);
1113                         break;
1114                 case WLAN_EID_SUPP_RATES:
1115                 case WLAN_EID_EXT_SUPP_RATES:
1116                         /* display all supported rates in readable format */
1117                         p = current_ev + iwe_stream_lcp_len(info);
1118
1119                         memset(&iwe, 0, sizeof(iwe));
1120                         iwe.cmd = SIOCGIWRATE;
1121                         /* Those two flags are ignored... */
1122                         iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
1123
1124                         for (i = 0; i < ie[1]; i++) {
1125                                 iwe.u.bitrate.value =
1126                                         ((ie[i + 2] & 0x7f) * 500000);
1127                                 p = iwe_stream_add_value(info, current_ev, p,
1128                                                 end_buf, &iwe, IW_EV_PARAM_LEN);
1129                         }
1130                         current_ev = p;
1131                         break;
1132                 }
1133                 rem -= ie[1] + 2;
1134                 ie += ie[1] + 2;
1135         }
1136
1137         if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
1138             ismesh) {
1139                 memset(&iwe, 0, sizeof(iwe));
1140                 iwe.cmd = SIOCGIWMODE;
1141                 if (ismesh)
1142                         iwe.u.mode = IW_MODE_MESH;
1143                 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
1144                         iwe.u.mode = IW_MODE_MASTER;
1145                 else
1146                         iwe.u.mode = IW_MODE_ADHOC;
1147                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1148                                                   &iwe, IW_EV_UINT_LEN);
1149         }
1150
1151         buf = kmalloc(30, GFP_ATOMIC);
1152         if (buf) {
1153                 memset(&iwe, 0, sizeof(iwe));
1154                 iwe.cmd = IWEVCUSTOM;
1155                 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
1156                 iwe.u.data.length = strlen(buf);
1157                 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1158                                                   &iwe, buf);
1159                 memset(&iwe, 0, sizeof(iwe));
1160                 iwe.cmd = IWEVCUSTOM;
1161                 sprintf(buf, " Last beacon: %ums ago",
1162                         elapsed_jiffies_msecs(bss->ts));
1163                 iwe.u.data.length = strlen(buf);
1164                 current_ev = iwe_stream_add_point(info, current_ev,
1165                                                   end_buf, &iwe, buf);
1166                 kfree(buf);
1167         }
1168
1169         ieee80211_scan_add_ies(info, &bss->pub, &current_ev, end_buf);
1170
1171         return current_ev;
1172 }
1173
1174
1175 static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
1176                                   struct iw_request_info *info,
1177                                   char *buf, size_t len)
1178 {
1179         char *current_ev = buf;
1180         char *end_buf = buf + len;
1181         struct cfg80211_internal_bss *bss;
1182
1183         spin_lock_bh(&dev->bss_lock);
1184         cfg80211_bss_expire(dev);
1185
1186         list_for_each_entry(bss, &dev->bss_list, list) {
1187                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
1188                         spin_unlock_bh(&dev->bss_lock);
1189                         return -E2BIG;
1190                 }
1191                 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
1192                                            current_ev, end_buf);
1193         }
1194         spin_unlock_bh(&dev->bss_lock);
1195         return current_ev - buf;
1196 }
1197
1198
1199 int cfg80211_wext_giwscan(struct net_device *dev,
1200                           struct iw_request_info *info,
1201                           struct iw_point *data, char *extra)
1202 {
1203         struct cfg80211_registered_device *rdev;
1204         int res;
1205
1206         if (!netif_running(dev))
1207                 return -ENETDOWN;
1208
1209         rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1210
1211         if (IS_ERR(rdev))
1212                 return PTR_ERR(rdev);
1213
1214         if (rdev->scan_req) {
1215                 res = -EAGAIN;
1216                 goto out;
1217         }
1218
1219         res = ieee80211_scan_results(rdev, info, extra, data->length);
1220         data->length = 0;
1221         if (res >= 0) {
1222                 data->length = res;
1223                 res = 0;
1224         }
1225
1226  out:
1227         cfg80211_unlock_rdev(rdev);
1228         return res;
1229 }
1230 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);
1231 #endif