Merge branch 'for-linus' of git://git.kernel.dk/linux-block
[linux-2.6.git] / net / wireless / scan.c
1 /*
2  * cfg80211 scan result handling
3  *
4  * Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
5  */
6 #include <linux/kernel.h>
7 #include <linux/slab.h>
8 #include <linux/module.h>
9 #include <linux/netdevice.h>
10 #include <linux/wireless.h>
11 #include <linux/nl80211.h>
12 #include <linux/etherdevice.h>
13 #include <net/arp.h>
14 #include <net/cfg80211.h>
15 #include <net/iw_handler.h>
16 #include "core.h"
17 #include "nl80211.h"
18 #include "wext-compat.h"
19
20 #define IEEE80211_SCAN_RESULT_EXPIRE    (15 * HZ)
21
22 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak)
23 {
24         struct cfg80211_scan_request *request;
25         struct net_device *dev;
26 #ifdef CONFIG_CFG80211_WEXT
27         union iwreq_data wrqu;
28 #endif
29
30         ASSERT_RDEV_LOCK(rdev);
31
32         request = rdev->scan_req;
33
34         if (!request)
35                 return;
36
37         dev = request->dev;
38
39         /*
40          * This must be before sending the other events!
41          * Otherwise, wpa_supplicant gets completely confused with
42          * wext events.
43          */
44         cfg80211_sme_scan_done(dev);
45
46         if (request->aborted)
47                 nl80211_send_scan_aborted(rdev, dev);
48         else
49                 nl80211_send_scan_done(rdev, dev);
50
51 #ifdef CONFIG_CFG80211_WEXT
52         if (!request->aborted) {
53                 memset(&wrqu, 0, sizeof(wrqu));
54
55                 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
56         }
57 #endif
58
59         dev_put(dev);
60
61         rdev->scan_req = NULL;
62
63         /*
64          * OK. If this is invoked with "leak" then we can't
65          * free this ... but we've cleaned it up anyway. The
66          * driver failed to call the scan_done callback, so
67          * all bets are off, it might still be trying to use
68          * the scan request or not ... if it accesses the dev
69          * in there (it shouldn't anyway) then it may crash.
70          */
71         if (!leak)
72                 kfree(request);
73 }
74
75 void __cfg80211_scan_done(struct work_struct *wk)
76 {
77         struct cfg80211_registered_device *rdev;
78
79         rdev = container_of(wk, struct cfg80211_registered_device,
80                             scan_done_wk);
81
82         cfg80211_lock_rdev(rdev);
83         ___cfg80211_scan_done(rdev, false);
84         cfg80211_unlock_rdev(rdev);
85 }
86
87 void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
88 {
89         WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);
90
91         request->aborted = aborted;
92         queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk);
93 }
94 EXPORT_SYMBOL(cfg80211_scan_done);
95
96 void __cfg80211_sched_scan_results(struct work_struct *wk)
97 {
98         struct cfg80211_registered_device *rdev;
99
100         rdev = container_of(wk, struct cfg80211_registered_device,
101                             sched_scan_results_wk);
102
103         cfg80211_lock_rdev(rdev);
104
105         /* we don't have sched_scan_req anymore if the scan is stopping */
106         if (rdev->sched_scan_req)
107                 nl80211_send_sched_scan_results(rdev,
108                                                 rdev->sched_scan_req->dev);
109
110         cfg80211_unlock_rdev(rdev);
111 }
112
113 void cfg80211_sched_scan_results(struct wiphy *wiphy)
114 {
115         /* ignore if we're not scanning */
116         if (wiphy_to_dev(wiphy)->sched_scan_req)
117                 queue_work(cfg80211_wq,
118                            &wiphy_to_dev(wiphy)->sched_scan_results_wk);
119 }
120 EXPORT_SYMBOL(cfg80211_sched_scan_results);
121
122 void cfg80211_sched_scan_stopped(struct wiphy *wiphy)
123 {
124         struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
125
126         cfg80211_lock_rdev(rdev);
127         __cfg80211_stop_sched_scan(rdev, true);
128         cfg80211_unlock_rdev(rdev);
129 }
130 EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
131
132 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
133                                bool driver_initiated)
134 {
135         int err;
136         struct net_device *dev;
137
138         ASSERT_RDEV_LOCK(rdev);
139
140         if (!rdev->sched_scan_req)
141                 return 0;
142
143         dev = rdev->sched_scan_req->dev;
144
145         if (!driver_initiated) {
146                 err = rdev->ops->sched_scan_stop(&rdev->wiphy, dev);
147                 if (err)
148                         return err;
149         }
150
151         nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED);
152
153         kfree(rdev->sched_scan_req);
154         rdev->sched_scan_req = NULL;
155
156         return err;
157 }
158
159 static void bss_release(struct kref *ref)
160 {
161         struct cfg80211_internal_bss *bss;
162
163         bss = container_of(ref, struct cfg80211_internal_bss, ref);
164         if (bss->pub.free_priv)
165                 bss->pub.free_priv(&bss->pub);
166
167         if (bss->beacon_ies_allocated)
168                 kfree(bss->pub.beacon_ies);
169         if (bss->proberesp_ies_allocated)
170                 kfree(bss->pub.proberesp_ies);
171
172         BUG_ON(atomic_read(&bss->hold));
173
174         kfree(bss);
175 }
176
177 /* must hold dev->bss_lock! */
178 void cfg80211_bss_age(struct cfg80211_registered_device *dev,
179                       unsigned long age_secs)
180 {
181         struct cfg80211_internal_bss *bss;
182         unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
183
184         list_for_each_entry(bss, &dev->bss_list, list) {
185                 bss->ts -= age_jiffies;
186         }
187 }
188
189 /* must hold dev->bss_lock! */
190 static void __cfg80211_unlink_bss(struct cfg80211_registered_device *dev,
191                                   struct cfg80211_internal_bss *bss)
192 {
193         list_del_init(&bss->list);
194         rb_erase(&bss->rbn, &dev->bss_tree);
195         kref_put(&bss->ref, bss_release);
196 }
197
198 /* must hold dev->bss_lock! */
199 void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
200 {
201         struct cfg80211_internal_bss *bss, *tmp;
202         bool expired = false;
203
204         list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
205                 if (atomic_read(&bss->hold))
206                         continue;
207                 if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE))
208                         continue;
209                 __cfg80211_unlink_bss(dev, bss);
210                 expired = true;
211         }
212
213         if (expired)
214                 dev->bss_generation++;
215 }
216
217 const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len)
218 {
219         while (len > 2 && ies[0] != eid) {
220                 len -= ies[1] + 2;
221                 ies += ies[1] + 2;
222         }
223         if (len < 2)
224                 return NULL;
225         if (len < 2 + ies[1])
226                 return NULL;
227         return ies;
228 }
229 EXPORT_SYMBOL(cfg80211_find_ie);
230
231 static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
232 {
233         const u8 *ie1 = cfg80211_find_ie(num, ies1, len1);
234         const u8 *ie2 = cfg80211_find_ie(num, ies2, len2);
235         int r;
236
237         if (!ie1 && !ie2)
238                 return 0;
239         if (!ie1 || !ie2)
240                 return -1;
241
242         r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1]));
243         if (r == 0 && ie1[1] != ie2[1])
244                 return ie2[1] - ie1[1];
245         return r;
246 }
247
248 static bool is_bss(struct cfg80211_bss *a,
249                    const u8 *bssid,
250                    const u8 *ssid, size_t ssid_len)
251 {
252         const u8 *ssidie;
253
254         if (bssid && compare_ether_addr(a->bssid, bssid))
255                 return false;
256
257         if (!ssid)
258                 return true;
259
260         ssidie = cfg80211_find_ie(WLAN_EID_SSID,
261                                   a->information_elements,
262                                   a->len_information_elements);
263         if (!ssidie)
264                 return false;
265         if (ssidie[1] != ssid_len)
266                 return false;
267         return memcmp(ssidie + 2, ssid, ssid_len) == 0;
268 }
269
270 static bool is_mesh(struct cfg80211_bss *a,
271                     const u8 *meshid, size_t meshidlen,
272                     const u8 *meshcfg)
273 {
274         const u8 *ie;
275
276         if (!WLAN_CAPABILITY_IS_MBSS(a->capability))
277                 return false;
278
279         ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
280                               a->information_elements,
281                               a->len_information_elements);
282         if (!ie)
283                 return false;
284         if (ie[1] != meshidlen)
285                 return false;
286         if (memcmp(ie + 2, meshid, meshidlen))
287                 return false;
288
289         ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
290                               a->information_elements,
291                               a->len_information_elements);
292         if (!ie)
293                 return false;
294         if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
295                 return false;
296
297         /*
298          * Ignore mesh capability (last two bytes of the IE) when
299          * comparing since that may differ between stations taking
300          * part in the same mesh.
301          */
302         return memcmp(ie + 2, meshcfg,
303             sizeof(struct ieee80211_meshconf_ie) - 2) == 0;
304 }
305
306 static int cmp_bss(struct cfg80211_bss *a,
307                    struct cfg80211_bss *b)
308 {
309         int r;
310
311         if (a->channel != b->channel)
312                 return b->channel->center_freq - a->channel->center_freq;
313
314         if (WLAN_CAPABILITY_IS_MBSS(a->capability | b->capability)) {
315                 r = cmp_ies(WLAN_EID_MESH_ID,
316                             a->information_elements,
317                             a->len_information_elements,
318                             b->information_elements,
319                             b->len_information_elements);
320                 if (r)
321                         return r;
322                 return cmp_ies(WLAN_EID_MESH_CONFIG,
323                                a->information_elements,
324                                a->len_information_elements,
325                                b->information_elements,
326                                b->len_information_elements);
327         }
328
329         r = memcmp(a->bssid, b->bssid, ETH_ALEN);
330         if (r)
331                 return r;
332
333         return cmp_ies(WLAN_EID_SSID,
334                        a->information_elements,
335                        a->len_information_elements,
336                        b->information_elements,
337                        b->len_information_elements);
338 }
339
340 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
341                                       struct ieee80211_channel *channel,
342                                       const u8 *bssid,
343                                       const u8 *ssid, size_t ssid_len,
344                                       u16 capa_mask, u16 capa_val)
345 {
346         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
347         struct cfg80211_internal_bss *bss, *res = NULL;
348         unsigned long now = jiffies;
349
350         spin_lock_bh(&dev->bss_lock);
351
352         list_for_each_entry(bss, &dev->bss_list, list) {
353                 if ((bss->pub.capability & capa_mask) != capa_val)
354                         continue;
355                 if (channel && bss->pub.channel != channel)
356                         continue;
357                 /* Don't get expired BSS structs */
358                 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
359                     !atomic_read(&bss->hold))
360                         continue;
361                 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
362                         res = bss;
363                         kref_get(&res->ref);
364                         break;
365                 }
366         }
367
368         spin_unlock_bh(&dev->bss_lock);
369         if (!res)
370                 return NULL;
371         return &res->pub;
372 }
373 EXPORT_SYMBOL(cfg80211_get_bss);
374
375 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
376                                        struct ieee80211_channel *channel,
377                                        const u8 *meshid, size_t meshidlen,
378                                        const u8 *meshcfg)
379 {
380         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
381         struct cfg80211_internal_bss *bss, *res = NULL;
382
383         spin_lock_bh(&dev->bss_lock);
384
385         list_for_each_entry(bss, &dev->bss_list, list) {
386                 if (channel && bss->pub.channel != channel)
387                         continue;
388                 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
389                         res = bss;
390                         kref_get(&res->ref);
391                         break;
392                 }
393         }
394
395         spin_unlock_bh(&dev->bss_lock);
396         if (!res)
397                 return NULL;
398         return &res->pub;
399 }
400 EXPORT_SYMBOL(cfg80211_get_mesh);
401
402
403 static void rb_insert_bss(struct cfg80211_registered_device *dev,
404                           struct cfg80211_internal_bss *bss)
405 {
406         struct rb_node **p = &dev->bss_tree.rb_node;
407         struct rb_node *parent = NULL;
408         struct cfg80211_internal_bss *tbss;
409         int cmp;
410
411         while (*p) {
412                 parent = *p;
413                 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
414
415                 cmp = cmp_bss(&bss->pub, &tbss->pub);
416
417                 if (WARN_ON(!cmp)) {
418                         /* will sort of leak this BSS */
419                         return;
420                 }
421
422                 if (cmp < 0)
423                         p = &(*p)->rb_left;
424                 else
425                         p = &(*p)->rb_right;
426         }
427
428         rb_link_node(&bss->rbn, parent, p);
429         rb_insert_color(&bss->rbn, &dev->bss_tree);
430 }
431
432 static struct cfg80211_internal_bss *
433 rb_find_bss(struct cfg80211_registered_device *dev,
434             struct cfg80211_internal_bss *res)
435 {
436         struct rb_node *n = dev->bss_tree.rb_node;
437         struct cfg80211_internal_bss *bss;
438         int r;
439
440         while (n) {
441                 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
442                 r = cmp_bss(&res->pub, &bss->pub);
443
444                 if (r == 0)
445                         return bss;
446                 else if (r < 0)
447                         n = n->rb_left;
448                 else
449                         n = n->rb_right;
450         }
451
452         return NULL;
453 }
454
455 static struct cfg80211_internal_bss *
456 cfg80211_bss_update(struct cfg80211_registered_device *dev,
457                     struct cfg80211_internal_bss *res)
458 {
459         struct cfg80211_internal_bss *found = NULL;
460         const u8 *meshid, *meshcfg;
461
462         /*
463          * The reference to "res" is donated to this function.
464          */
465
466         if (WARN_ON(!res->pub.channel)) {
467                 kref_put(&res->ref, bss_release);
468                 return NULL;
469         }
470
471         res->ts = jiffies;
472
473         if (WLAN_CAPABILITY_IS_MBSS(res->pub.capability)) {
474                 /* must be mesh, verify */
475                 meshid = cfg80211_find_ie(WLAN_EID_MESH_ID,
476                                           res->pub.information_elements,
477                                           res->pub.len_information_elements);
478                 meshcfg = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
479                                            res->pub.information_elements,
480                                            res->pub.len_information_elements);
481                 if (!meshid || !meshcfg ||
482                     meshcfg[1] != sizeof(struct ieee80211_meshconf_ie)) {
483                         /* bogus mesh */
484                         kref_put(&res->ref, bss_release);
485                         return NULL;
486                 }
487         }
488
489         spin_lock_bh(&dev->bss_lock);
490
491         found = rb_find_bss(dev, res);
492
493         if (found) {
494                 found->pub.beacon_interval = res->pub.beacon_interval;
495                 found->pub.tsf = res->pub.tsf;
496                 found->pub.signal = res->pub.signal;
497                 found->pub.capability = res->pub.capability;
498                 found->ts = res->ts;
499
500                 /* Update IEs */
501                 if (res->pub.proberesp_ies) {
502                         size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
503                         size_t ielen = res->pub.len_proberesp_ies;
504
505                         if (found->pub.proberesp_ies &&
506                             !found->proberesp_ies_allocated &&
507                             ksize(found) >= used + ielen) {
508                                 memcpy(found->pub.proberesp_ies,
509                                        res->pub.proberesp_ies, ielen);
510                                 found->pub.len_proberesp_ies = ielen;
511                         } else {
512                                 u8 *ies = found->pub.proberesp_ies;
513
514                                 if (found->proberesp_ies_allocated)
515                                         ies = krealloc(ies, ielen, GFP_ATOMIC);
516                                 else
517                                         ies = kmalloc(ielen, GFP_ATOMIC);
518
519                                 if (ies) {
520                                         memcpy(ies, res->pub.proberesp_ies,
521                                                ielen);
522                                         found->proberesp_ies_allocated = true;
523                                         found->pub.proberesp_ies = ies;
524                                         found->pub.len_proberesp_ies = ielen;
525                                 }
526                         }
527
528                         /* Override possible earlier Beacon frame IEs */
529                         found->pub.information_elements =
530                                 found->pub.proberesp_ies;
531                         found->pub.len_information_elements =
532                                 found->pub.len_proberesp_ies;
533                 }
534                 if (res->pub.beacon_ies) {
535                         size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
536                         size_t ielen = res->pub.len_beacon_ies;
537                         bool information_elements_is_beacon_ies =
538                                 (found->pub.information_elements ==
539                                  found->pub.beacon_ies);
540
541                         if (found->pub.beacon_ies &&
542                             !found->beacon_ies_allocated &&
543                             ksize(found) >= used + ielen) {
544                                 memcpy(found->pub.beacon_ies,
545                                        res->pub.beacon_ies, ielen);
546                                 found->pub.len_beacon_ies = ielen;
547                         } else {
548                                 u8 *ies = found->pub.beacon_ies;
549
550                                 if (found->beacon_ies_allocated)
551                                         ies = krealloc(ies, ielen, GFP_ATOMIC);
552                                 else
553                                         ies = kmalloc(ielen, GFP_ATOMIC);
554
555                                 if (ies) {
556                                         memcpy(ies, res->pub.beacon_ies,
557                                                ielen);
558                                         found->beacon_ies_allocated = true;
559                                         found->pub.beacon_ies = ies;
560                                         found->pub.len_beacon_ies = ielen;
561                                 }
562                         }
563
564                         /* Override IEs if they were from a beacon before */
565                         if (information_elements_is_beacon_ies) {
566                                 found->pub.information_elements =
567                                         found->pub.beacon_ies;
568                                 found->pub.len_information_elements =
569                                         found->pub.len_beacon_ies;
570                         }
571                 }
572
573                 kref_put(&res->ref, bss_release);
574         } else {
575                 /* this "consumes" the reference */
576                 list_add_tail(&res->list, &dev->bss_list);
577                 rb_insert_bss(dev, res);
578                 found = res;
579         }
580
581         dev->bss_generation++;
582         spin_unlock_bh(&dev->bss_lock);
583
584         kref_get(&found->ref);
585         return found;
586 }
587
588 struct cfg80211_bss*
589 cfg80211_inform_bss(struct wiphy *wiphy,
590                     struct ieee80211_channel *channel,
591                     const u8 *bssid,
592                     u64 timestamp, u16 capability, u16 beacon_interval,
593                     const u8 *ie, size_t ielen,
594                     s32 signal, gfp_t gfp)
595 {
596         struct cfg80211_internal_bss *res;
597         size_t privsz;
598
599         if (WARN_ON(!wiphy))
600                 return NULL;
601
602         privsz = wiphy->bss_priv_size;
603
604         if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
605                         (signal < 0 || signal > 100)))
606                 return NULL;
607
608         res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
609         if (!res)
610                 return NULL;
611
612         memcpy(res->pub.bssid, bssid, ETH_ALEN);
613         res->pub.channel = channel;
614         res->pub.signal = signal;
615         res->pub.tsf = timestamp;
616         res->pub.beacon_interval = beacon_interval;
617         res->pub.capability = capability;
618         /*
619          * Since we do not know here whether the IEs are from a Beacon or Probe
620          * Response frame, we need to pick one of the options and only use it
621          * with the driver that does not provide the full Beacon/Probe Response
622          * frame. Use Beacon frame pointer to avoid indicating that this should
623          * override the information_elements pointer should we have received an
624          * earlier indication of Probe Response data.
625          *
626          * The initial buffer for the IEs is allocated with the BSS entry and
627          * is located after the private area.
628          */
629         res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz;
630         memcpy(res->pub.beacon_ies, ie, ielen);
631         res->pub.len_beacon_ies = ielen;
632         res->pub.information_elements = res->pub.beacon_ies;
633         res->pub.len_information_elements = res->pub.len_beacon_ies;
634
635         kref_init(&res->ref);
636
637         res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
638         if (!res)
639                 return NULL;
640
641         if (res->pub.capability & WLAN_CAPABILITY_ESS)
642                 regulatory_hint_found_beacon(wiphy, channel, gfp);
643
644         /* cfg80211_bss_update gives us a referenced result */
645         return &res->pub;
646 }
647 EXPORT_SYMBOL(cfg80211_inform_bss);
648
649 struct cfg80211_bss *
650 cfg80211_inform_bss_frame(struct wiphy *wiphy,
651                           struct ieee80211_channel *channel,
652                           struct ieee80211_mgmt *mgmt, size_t len,
653                           s32 signal, gfp_t gfp)
654 {
655         struct cfg80211_internal_bss *res;
656         size_t ielen = len - offsetof(struct ieee80211_mgmt,
657                                       u.probe_resp.variable);
658         size_t privsz;
659
660         if (WARN_ON(!mgmt))
661                 return NULL;
662
663         if (WARN_ON(!wiphy))
664                 return NULL;
665
666         if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
667                     (signal < 0 || signal > 100)))
668                 return NULL;
669
670         if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
671                 return NULL;
672
673         privsz = wiphy->bss_priv_size;
674
675         res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
676         if (!res)
677                 return NULL;
678
679         memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
680         res->pub.channel = channel;
681         res->pub.signal = signal;
682         res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
683         res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
684         res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
685         /*
686          * The initial buffer for the IEs is allocated with the BSS entry and
687          * is located after the private area.
688          */
689         if (ieee80211_is_probe_resp(mgmt->frame_control)) {
690                 res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz;
691                 memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable,
692                        ielen);
693                 res->pub.len_proberesp_ies = ielen;
694                 res->pub.information_elements = res->pub.proberesp_ies;
695                 res->pub.len_information_elements = res->pub.len_proberesp_ies;
696         } else {
697                 res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz;
698                 memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen);
699                 res->pub.len_beacon_ies = ielen;
700                 res->pub.information_elements = res->pub.beacon_ies;
701                 res->pub.len_information_elements = res->pub.len_beacon_ies;
702         }
703
704         kref_init(&res->ref);
705
706         res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
707         if (!res)
708                 return NULL;
709
710         if (res->pub.capability & WLAN_CAPABILITY_ESS)
711                 regulatory_hint_found_beacon(wiphy, channel, gfp);
712
713         /* cfg80211_bss_update gives us a referenced result */
714         return &res->pub;
715 }
716 EXPORT_SYMBOL(cfg80211_inform_bss_frame);
717
718 void cfg80211_put_bss(struct cfg80211_bss *pub)
719 {
720         struct cfg80211_internal_bss *bss;
721
722         if (!pub)
723                 return;
724
725         bss = container_of(pub, struct cfg80211_internal_bss, pub);
726         kref_put(&bss->ref, bss_release);
727 }
728 EXPORT_SYMBOL(cfg80211_put_bss);
729
730 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
731 {
732         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
733         struct cfg80211_internal_bss *bss;
734
735         if (WARN_ON(!pub))
736                 return;
737
738         bss = container_of(pub, struct cfg80211_internal_bss, pub);
739
740         spin_lock_bh(&dev->bss_lock);
741         if (!list_empty(&bss->list)) {
742                 __cfg80211_unlink_bss(dev, bss);
743                 dev->bss_generation++;
744         }
745         spin_unlock_bh(&dev->bss_lock);
746 }
747 EXPORT_SYMBOL(cfg80211_unlink_bss);
748
749 #ifdef CONFIG_CFG80211_WEXT
750 int cfg80211_wext_siwscan(struct net_device *dev,
751                           struct iw_request_info *info,
752                           union iwreq_data *wrqu, char *extra)
753 {
754         struct cfg80211_registered_device *rdev;
755         struct wiphy *wiphy;
756         struct iw_scan_req *wreq = NULL;
757         struct cfg80211_scan_request *creq = NULL;
758         int i, err, n_channels = 0;
759         enum ieee80211_band band;
760
761         if (!netif_running(dev))
762                 return -ENETDOWN;
763
764         if (wrqu->data.length == sizeof(struct iw_scan_req))
765                 wreq = (struct iw_scan_req *)extra;
766
767         rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
768
769         if (IS_ERR(rdev))
770                 return PTR_ERR(rdev);
771
772         if (rdev->scan_req) {
773                 err = -EBUSY;
774                 goto out;
775         }
776
777         wiphy = &rdev->wiphy;
778
779         /* Determine number of channels, needed to allocate creq */
780         if (wreq && wreq->num_channels)
781                 n_channels = wreq->num_channels;
782         else {
783                 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
784                         if (wiphy->bands[band])
785                                 n_channels += wiphy->bands[band]->n_channels;
786         }
787
788         creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
789                        n_channels * sizeof(void *),
790                        GFP_ATOMIC);
791         if (!creq) {
792                 err = -ENOMEM;
793                 goto out;
794         }
795
796         creq->wiphy = wiphy;
797         creq->dev = dev;
798         /* SSIDs come after channels */
799         creq->ssids = (void *)&creq->channels[n_channels];
800         creq->n_channels = n_channels;
801         creq->n_ssids = 1;
802
803         /* translate "Scan on frequencies" request */
804         i = 0;
805         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
806                 int j;
807
808                 if (!wiphy->bands[band])
809                         continue;
810
811                 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
812                         /* ignore disabled channels */
813                         if (wiphy->bands[band]->channels[j].flags &
814                                                 IEEE80211_CHAN_DISABLED)
815                                 continue;
816
817                         /* If we have a wireless request structure and the
818                          * wireless request specifies frequencies, then search
819                          * for the matching hardware channel.
820                          */
821                         if (wreq && wreq->num_channels) {
822                                 int k;
823                                 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
824                                 for (k = 0; k < wreq->num_channels; k++) {
825                                         int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]);
826                                         if (wext_freq == wiphy_freq)
827                                                 goto wext_freq_found;
828                                 }
829                                 goto wext_freq_not_found;
830                         }
831
832                 wext_freq_found:
833                         creq->channels[i] = &wiphy->bands[band]->channels[j];
834                         i++;
835                 wext_freq_not_found: ;
836                 }
837         }
838         /* No channels found? */
839         if (!i) {
840                 err = -EINVAL;
841                 goto out;
842         }
843
844         /* Set real number of channels specified in creq->channels[] */
845         creq->n_channels = i;
846
847         /* translate "Scan for SSID" request */
848         if (wreq) {
849                 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
850                         if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
851                                 err = -EINVAL;
852                                 goto out;
853                         }
854                         memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
855                         creq->ssids[0].ssid_len = wreq->essid_len;
856                 }
857                 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
858                         creq->n_ssids = 0;
859         }
860
861         rdev->scan_req = creq;
862         err = rdev->ops->scan(wiphy, dev, creq);
863         if (err) {
864                 rdev->scan_req = NULL;
865                 /* creq will be freed below */
866         } else {
867                 nl80211_send_scan_start(rdev, dev);
868                 /* creq now owned by driver */
869                 creq = NULL;
870                 dev_hold(dev);
871         }
872  out:
873         kfree(creq);
874         cfg80211_unlock_rdev(rdev);
875         return err;
876 }
877 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
878
879 static void ieee80211_scan_add_ies(struct iw_request_info *info,
880                                    struct cfg80211_bss *bss,
881                                    char **current_ev, char *end_buf)
882 {
883         u8 *pos, *end, *next;
884         struct iw_event iwe;
885
886         if (!bss->information_elements ||
887             !bss->len_information_elements)
888                 return;
889
890         /*
891          * If needed, fragment the IEs buffer (at IE boundaries) into short
892          * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
893          */
894         pos = bss->information_elements;
895         end = pos + bss->len_information_elements;
896
897         while (end - pos > IW_GENERIC_IE_MAX) {
898                 next = pos + 2 + pos[1];
899                 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
900                         next = next + 2 + next[1];
901
902                 memset(&iwe, 0, sizeof(iwe));
903                 iwe.cmd = IWEVGENIE;
904                 iwe.u.data.length = next - pos;
905                 *current_ev = iwe_stream_add_point(info, *current_ev,
906                                                    end_buf, &iwe, pos);
907
908                 pos = next;
909         }
910
911         if (end > pos) {
912                 memset(&iwe, 0, sizeof(iwe));
913                 iwe.cmd = IWEVGENIE;
914                 iwe.u.data.length = end - pos;
915                 *current_ev = iwe_stream_add_point(info, *current_ev,
916                                                    end_buf, &iwe, pos);
917         }
918 }
919
920 static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
921 {
922         unsigned long end = jiffies;
923
924         if (end >= start)
925                 return jiffies_to_msecs(end - start);
926
927         return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
928 }
929
930 static char *
931 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
932               struct cfg80211_internal_bss *bss, char *current_ev,
933               char *end_buf)
934 {
935         struct iw_event iwe;
936         u8 *buf, *cfg, *p;
937         u8 *ie = bss->pub.information_elements;
938         int rem = bss->pub.len_information_elements, i, sig;
939         bool ismesh = false;
940
941         memset(&iwe, 0, sizeof(iwe));
942         iwe.cmd = SIOCGIWAP;
943         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
944         memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
945         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
946                                           IW_EV_ADDR_LEN);
947
948         memset(&iwe, 0, sizeof(iwe));
949         iwe.cmd = SIOCGIWFREQ;
950         iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
951         iwe.u.freq.e = 0;
952         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
953                                           IW_EV_FREQ_LEN);
954
955         memset(&iwe, 0, sizeof(iwe));
956         iwe.cmd = SIOCGIWFREQ;
957         iwe.u.freq.m = bss->pub.channel->center_freq;
958         iwe.u.freq.e = 6;
959         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
960                                           IW_EV_FREQ_LEN);
961
962         if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
963                 memset(&iwe, 0, sizeof(iwe));
964                 iwe.cmd = IWEVQUAL;
965                 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
966                                      IW_QUAL_NOISE_INVALID |
967                                      IW_QUAL_QUAL_UPDATED;
968                 switch (wiphy->signal_type) {
969                 case CFG80211_SIGNAL_TYPE_MBM:
970                         sig = bss->pub.signal / 100;
971                         iwe.u.qual.level = sig;
972                         iwe.u.qual.updated |= IW_QUAL_DBM;
973                         if (sig < -110)         /* rather bad */
974                                 sig = -110;
975                         else if (sig > -40)     /* perfect */
976                                 sig = -40;
977                         /* will give a range of 0 .. 70 */
978                         iwe.u.qual.qual = sig + 110;
979                         break;
980                 case CFG80211_SIGNAL_TYPE_UNSPEC:
981                         iwe.u.qual.level = bss->pub.signal;
982                         /* will give range 0 .. 100 */
983                         iwe.u.qual.qual = bss->pub.signal;
984                         break;
985                 default:
986                         /* not reached */
987                         break;
988                 }
989                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
990                                                   &iwe, IW_EV_QUAL_LEN);
991         }
992
993         memset(&iwe, 0, sizeof(iwe));
994         iwe.cmd = SIOCGIWENCODE;
995         if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
996                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
997         else
998                 iwe.u.data.flags = IW_ENCODE_DISABLED;
999         iwe.u.data.length = 0;
1000         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1001                                           &iwe, "");
1002
1003         while (rem >= 2) {
1004                 /* invalid data */
1005                 if (ie[1] > rem - 2)
1006                         break;
1007
1008                 switch (ie[0]) {
1009                 case WLAN_EID_SSID:
1010                         memset(&iwe, 0, sizeof(iwe));
1011                         iwe.cmd = SIOCGIWESSID;
1012                         iwe.u.data.length = ie[1];
1013                         iwe.u.data.flags = 1;
1014                         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1015                                                           &iwe, ie + 2);
1016                         break;
1017                 case WLAN_EID_MESH_ID:
1018                         memset(&iwe, 0, sizeof(iwe));
1019                         iwe.cmd = SIOCGIWESSID;
1020                         iwe.u.data.length = ie[1];
1021                         iwe.u.data.flags = 1;
1022                         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1023                                                           &iwe, ie + 2);
1024                         break;
1025                 case WLAN_EID_MESH_CONFIG:
1026                         ismesh = true;
1027                         if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
1028                                 break;
1029                         buf = kmalloc(50, GFP_ATOMIC);
1030                         if (!buf)
1031                                 break;
1032                         cfg = ie + 2;
1033                         memset(&iwe, 0, sizeof(iwe));
1034                         iwe.cmd = IWEVCUSTOM;
1035                         sprintf(buf, "Mesh Network Path Selection Protocol ID: "
1036                                 "0x%02X", cfg[0]);
1037                         iwe.u.data.length = strlen(buf);
1038                         current_ev = iwe_stream_add_point(info, current_ev,
1039                                                           end_buf,
1040                                                           &iwe, buf);
1041                         sprintf(buf, "Path Selection Metric ID: 0x%02X",
1042                                 cfg[1]);
1043                         iwe.u.data.length = strlen(buf);
1044                         current_ev = iwe_stream_add_point(info, current_ev,
1045                                                           end_buf,
1046                                                           &iwe, buf);
1047                         sprintf(buf, "Congestion Control Mode ID: 0x%02X",
1048                                 cfg[2]);
1049                         iwe.u.data.length = strlen(buf);
1050                         current_ev = iwe_stream_add_point(info, current_ev,
1051                                                           end_buf,
1052                                                           &iwe, buf);
1053                         sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
1054                         iwe.u.data.length = strlen(buf);
1055                         current_ev = iwe_stream_add_point(info, current_ev,
1056                                                           end_buf,
1057                                                           &iwe, buf);
1058                         sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
1059                         iwe.u.data.length = strlen(buf);
1060                         current_ev = iwe_stream_add_point(info, current_ev,
1061                                                           end_buf,
1062                                                           &iwe, buf);
1063                         sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
1064                         iwe.u.data.length = strlen(buf);
1065                         current_ev = iwe_stream_add_point(info, current_ev,
1066                                                           end_buf,
1067                                                           &iwe, buf);
1068                         sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
1069                         iwe.u.data.length = strlen(buf);
1070                         current_ev = iwe_stream_add_point(info, current_ev,
1071                                                           end_buf,
1072                                                           &iwe, buf);
1073                         kfree(buf);
1074                         break;
1075                 case WLAN_EID_SUPP_RATES:
1076                 case WLAN_EID_EXT_SUPP_RATES:
1077                         /* display all supported rates in readable format */
1078                         p = current_ev + iwe_stream_lcp_len(info);
1079
1080                         memset(&iwe, 0, sizeof(iwe));
1081                         iwe.cmd = SIOCGIWRATE;
1082                         /* Those two flags are ignored... */
1083                         iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
1084
1085                         for (i = 0; i < ie[1]; i++) {
1086                                 iwe.u.bitrate.value =
1087                                         ((ie[i + 2] & 0x7f) * 500000);
1088                                 p = iwe_stream_add_value(info, current_ev, p,
1089                                                 end_buf, &iwe, IW_EV_PARAM_LEN);
1090                         }
1091                         current_ev = p;
1092                         break;
1093                 }
1094                 rem -= ie[1] + 2;
1095                 ie += ie[1] + 2;
1096         }
1097
1098         if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
1099             ismesh) {
1100                 memset(&iwe, 0, sizeof(iwe));
1101                 iwe.cmd = SIOCGIWMODE;
1102                 if (ismesh)
1103                         iwe.u.mode = IW_MODE_MESH;
1104                 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
1105                         iwe.u.mode = IW_MODE_MASTER;
1106                 else
1107                         iwe.u.mode = IW_MODE_ADHOC;
1108                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1109                                                   &iwe, IW_EV_UINT_LEN);
1110         }
1111
1112         buf = kmalloc(30, GFP_ATOMIC);
1113         if (buf) {
1114                 memset(&iwe, 0, sizeof(iwe));
1115                 iwe.cmd = IWEVCUSTOM;
1116                 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
1117                 iwe.u.data.length = strlen(buf);
1118                 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1119                                                   &iwe, buf);
1120                 memset(&iwe, 0, sizeof(iwe));
1121                 iwe.cmd = IWEVCUSTOM;
1122                 sprintf(buf, " Last beacon: %ums ago",
1123                         elapsed_jiffies_msecs(bss->ts));
1124                 iwe.u.data.length = strlen(buf);
1125                 current_ev = iwe_stream_add_point(info, current_ev,
1126                                                   end_buf, &iwe, buf);
1127                 kfree(buf);
1128         }
1129
1130         ieee80211_scan_add_ies(info, &bss->pub, &current_ev, end_buf);
1131
1132         return current_ev;
1133 }
1134
1135
1136 static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
1137                                   struct iw_request_info *info,
1138                                   char *buf, size_t len)
1139 {
1140         char *current_ev = buf;
1141         char *end_buf = buf + len;
1142         struct cfg80211_internal_bss *bss;
1143
1144         spin_lock_bh(&dev->bss_lock);
1145         cfg80211_bss_expire(dev);
1146
1147         list_for_each_entry(bss, &dev->bss_list, list) {
1148                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
1149                         spin_unlock_bh(&dev->bss_lock);
1150                         return -E2BIG;
1151                 }
1152                 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
1153                                            current_ev, end_buf);
1154         }
1155         spin_unlock_bh(&dev->bss_lock);
1156         return current_ev - buf;
1157 }
1158
1159
1160 int cfg80211_wext_giwscan(struct net_device *dev,
1161                           struct iw_request_info *info,
1162                           struct iw_point *data, char *extra)
1163 {
1164         struct cfg80211_registered_device *rdev;
1165         int res;
1166
1167         if (!netif_running(dev))
1168                 return -ENETDOWN;
1169
1170         rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1171
1172         if (IS_ERR(rdev))
1173                 return PTR_ERR(rdev);
1174
1175         if (rdev->scan_req) {
1176                 res = -EAGAIN;
1177                 goto out;
1178         }
1179
1180         res = ieee80211_scan_results(rdev, info, extra, data->length);
1181         data->length = 0;
1182         if (res >= 0) {
1183                 data->length = res;
1184                 res = 0;
1185         }
1186
1187  out:
1188         cfg80211_unlock_rdev(rdev);
1189         return res;
1190 }
1191 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);
1192 #endif