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