cfg80211: add cfg80211_inform_bss
[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/module.h>
8 #include <linux/netdevice.h>
9 #include <linux/wireless.h>
10 #include <linux/nl80211.h>
11 #include <linux/etherdevice.h>
12 #include <net/arp.h>
13 #include <net/cfg80211.h>
14 #include <net/iw_handler.h>
15 #include "core.h"
16 #include "nl80211.h"
17
18 #define IEEE80211_SCAN_RESULT_EXPIRE    (10 * HZ)
19
20 void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
21 {
22         struct net_device *dev;
23 #ifdef CONFIG_WIRELESS_EXT
24         union iwreq_data wrqu;
25 #endif
26
27         dev = dev_get_by_index(&init_net, request->ifidx);
28         if (!dev)
29                 goto out;
30
31         WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);
32         wiphy_to_dev(request->wiphy)->scan_req = NULL;
33
34         if (aborted)
35                 nl80211_send_scan_aborted(wiphy_to_dev(request->wiphy), dev);
36         else
37                 nl80211_send_scan_done(wiphy_to_dev(request->wiphy), dev);
38
39 #ifdef CONFIG_WIRELESS_EXT
40         if (!aborted) {
41                 memset(&wrqu, 0, sizeof(wrqu));
42
43                 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
44         }
45 #endif
46
47         dev_put(dev);
48
49  out:
50         kfree(request);
51 }
52 EXPORT_SYMBOL(cfg80211_scan_done);
53
54 static void bss_release(struct kref *ref)
55 {
56         struct cfg80211_internal_bss *bss;
57
58         bss = container_of(ref, struct cfg80211_internal_bss, ref);
59         if (bss->pub.free_priv)
60                 bss->pub.free_priv(&bss->pub);
61
62         if (bss->ies_allocated)
63                 kfree(bss->pub.information_elements);
64
65         kfree(bss);
66 }
67
68 /* must hold dev->bss_lock! */
69 void cfg80211_bss_age(struct cfg80211_registered_device *dev,
70                       unsigned long age_secs)
71 {
72         struct cfg80211_internal_bss *bss;
73         unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
74
75         list_for_each_entry(bss, &dev->bss_list, list) {
76                 bss->ts -= age_jiffies;
77         }
78 }
79
80 /* must hold dev->bss_lock! */
81 void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
82 {
83         struct cfg80211_internal_bss *bss, *tmp;
84         bool expired = false;
85
86         list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
87                 if (bss->hold ||
88                     !time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE))
89                         continue;
90                 list_del(&bss->list);
91                 rb_erase(&bss->rbn, &dev->bss_tree);
92                 kref_put(&bss->ref, bss_release);
93                 expired = true;
94         }
95
96         if (expired)
97                 dev->bss_generation++;
98 }
99
100 static u8 *find_ie(u8 num, u8 *ies, size_t len)
101 {
102         while (len > 2 && ies[0] != num) {
103                 len -= ies[1] + 2;
104                 ies += ies[1] + 2;
105         }
106         if (len < 2)
107                 return NULL;
108         if (len < 2 + ies[1])
109                 return NULL;
110         return ies;
111 }
112
113 static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
114 {
115         const u8 *ie1 = find_ie(num, ies1, len1);
116         const u8 *ie2 = find_ie(num, ies2, len2);
117         int r;
118
119         if (!ie1 && !ie2)
120                 return 0;
121         if (!ie1)
122                 return -1;
123
124         r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1]));
125         if (r == 0 && ie1[1] != ie2[1])
126                 return ie2[1] - ie1[1];
127         return r;
128 }
129
130 static bool is_bss(struct cfg80211_bss *a,
131                    const u8 *bssid,
132                    const u8 *ssid, size_t ssid_len)
133 {
134         const u8 *ssidie;
135
136         if (bssid && compare_ether_addr(a->bssid, bssid))
137                 return false;
138
139         if (!ssid)
140                 return true;
141
142         ssidie = find_ie(WLAN_EID_SSID,
143                          a->information_elements,
144                          a->len_information_elements);
145         if (!ssidie)
146                 return false;
147         if (ssidie[1] != ssid_len)
148                 return false;
149         return memcmp(ssidie + 2, ssid, ssid_len) == 0;
150 }
151
152 static bool is_mesh(struct cfg80211_bss *a,
153                     const u8 *meshid, size_t meshidlen,
154                     const u8 *meshcfg)
155 {
156         const u8 *ie;
157
158         if (!is_zero_ether_addr(a->bssid))
159                 return false;
160
161         ie = find_ie(WLAN_EID_MESH_ID,
162                      a->information_elements,
163                      a->len_information_elements);
164         if (!ie)
165                 return false;
166         if (ie[1] != meshidlen)
167                 return false;
168         if (memcmp(ie + 2, meshid, meshidlen))
169                 return false;
170
171         ie = find_ie(WLAN_EID_MESH_CONFIG,
172                      a->information_elements,
173                      a->len_information_elements);
174         if (ie[1] != IEEE80211_MESH_CONFIG_LEN)
175                 return false;
176
177         /*
178          * Ignore mesh capability (last two bytes of the IE) when
179          * comparing since that may differ between stations taking
180          * part in the same mesh.
181          */
182         return memcmp(ie + 2, meshcfg, IEEE80211_MESH_CONFIG_LEN - 2) == 0;
183 }
184
185 static int cmp_bss(struct cfg80211_bss *a,
186                    struct cfg80211_bss *b)
187 {
188         int r;
189
190         if (a->channel != b->channel)
191                 return b->channel->center_freq - a->channel->center_freq;
192
193         r = memcmp(a->bssid, b->bssid, ETH_ALEN);
194         if (r)
195                 return r;
196
197         if (is_zero_ether_addr(a->bssid)) {
198                 r = cmp_ies(WLAN_EID_MESH_ID,
199                             a->information_elements,
200                             a->len_information_elements,
201                             b->information_elements,
202                             b->len_information_elements);
203                 if (r)
204                         return r;
205                 return cmp_ies(WLAN_EID_MESH_CONFIG,
206                                a->information_elements,
207                                a->len_information_elements,
208                                b->information_elements,
209                                b->len_information_elements);
210         }
211
212         return cmp_ies(WLAN_EID_SSID,
213                        a->information_elements,
214                        a->len_information_elements,
215                        b->information_elements,
216                        b->len_information_elements);
217 }
218
219 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
220                                       struct ieee80211_channel *channel,
221                                       const u8 *bssid,
222                                       const u8 *ssid, size_t ssid_len,
223                                       u16 capa_mask, u16 capa_val)
224 {
225         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
226         struct cfg80211_internal_bss *bss, *res = NULL;
227
228         spin_lock_bh(&dev->bss_lock);
229
230         list_for_each_entry(bss, &dev->bss_list, list) {
231                 if ((bss->pub.capability & capa_mask) != capa_val)
232                         continue;
233                 if (channel && bss->pub.channel != channel)
234                         continue;
235                 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
236                         res = bss;
237                         kref_get(&res->ref);
238                         break;
239                 }
240         }
241
242         spin_unlock_bh(&dev->bss_lock);
243         if (!res)
244                 return NULL;
245         return &res->pub;
246 }
247 EXPORT_SYMBOL(cfg80211_get_bss);
248
249 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
250                                        struct ieee80211_channel *channel,
251                                        const u8 *meshid, size_t meshidlen,
252                                        const u8 *meshcfg)
253 {
254         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
255         struct cfg80211_internal_bss *bss, *res = NULL;
256
257         spin_lock_bh(&dev->bss_lock);
258
259         list_for_each_entry(bss, &dev->bss_list, list) {
260                 if (channel && bss->pub.channel != channel)
261                         continue;
262                 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
263                         res = bss;
264                         kref_get(&res->ref);
265                         break;
266                 }
267         }
268
269         spin_unlock_bh(&dev->bss_lock);
270         if (!res)
271                 return NULL;
272         return &res->pub;
273 }
274 EXPORT_SYMBOL(cfg80211_get_mesh);
275
276
277 static void rb_insert_bss(struct cfg80211_registered_device *dev,
278                           struct cfg80211_internal_bss *bss)
279 {
280         struct rb_node **p = &dev->bss_tree.rb_node;
281         struct rb_node *parent = NULL;
282         struct cfg80211_internal_bss *tbss;
283         int cmp;
284
285         while (*p) {
286                 parent = *p;
287                 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
288
289                 cmp = cmp_bss(&bss->pub, &tbss->pub);
290
291                 if (WARN_ON(!cmp)) {
292                         /* will sort of leak this BSS */
293                         return;
294                 }
295
296                 if (cmp < 0)
297                         p = &(*p)->rb_left;
298                 else
299                         p = &(*p)->rb_right;
300         }
301
302         rb_link_node(&bss->rbn, parent, p);
303         rb_insert_color(&bss->rbn, &dev->bss_tree);
304 }
305
306 static struct cfg80211_internal_bss *
307 rb_find_bss(struct cfg80211_registered_device *dev,
308             struct cfg80211_internal_bss *res)
309 {
310         struct rb_node *n = dev->bss_tree.rb_node;
311         struct cfg80211_internal_bss *bss;
312         int r;
313
314         while (n) {
315                 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
316                 r = cmp_bss(&res->pub, &bss->pub);
317
318                 if (r == 0)
319                         return bss;
320                 else if (r < 0)
321                         n = n->rb_left;
322                 else
323                         n = n->rb_right;
324         }
325
326         return NULL;
327 }
328
329 static struct cfg80211_internal_bss *
330 cfg80211_bss_update(struct cfg80211_registered_device *dev,
331                     struct cfg80211_internal_bss *res,
332                     bool overwrite)
333 {
334         struct cfg80211_internal_bss *found = NULL;
335         const u8 *meshid, *meshcfg;
336
337         /*
338          * The reference to "res" is donated to this function.
339          */
340
341         if (WARN_ON(!res->pub.channel)) {
342                 kref_put(&res->ref, bss_release);
343                 return NULL;
344         }
345
346         res->ts = jiffies;
347
348         if (is_zero_ether_addr(res->pub.bssid)) {
349                 /* must be mesh, verify */
350                 meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements,
351                                  res->pub.len_information_elements);
352                 meshcfg = find_ie(WLAN_EID_MESH_CONFIG,
353                                   res->pub.information_elements,
354                                   res->pub.len_information_elements);
355                 if (!meshid || !meshcfg ||
356                     meshcfg[1] != IEEE80211_MESH_CONFIG_LEN) {
357                         /* bogus mesh */
358                         kref_put(&res->ref, bss_release);
359                         return NULL;
360                 }
361         }
362
363         spin_lock_bh(&dev->bss_lock);
364
365         found = rb_find_bss(dev, res);
366
367         if (found) {
368                 kref_get(&found->ref);
369                 found->pub.beacon_interval = res->pub.beacon_interval;
370                 found->pub.tsf = res->pub.tsf;
371                 found->pub.signal = res->pub.signal;
372                 found->pub.capability = res->pub.capability;
373                 found->ts = res->ts;
374
375                 /* overwrite IEs */
376                 if (overwrite) {
377                         size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
378                         size_t ielen = res->pub.len_information_elements;
379
380                         if (ksize(found) >= used + ielen) {
381                                 memcpy(found->pub.information_elements,
382                                        res->pub.information_elements, ielen);
383                                 found->pub.len_information_elements = ielen;
384                         } else {
385                                 u8 *ies = found->pub.information_elements;
386
387                                 if (found->ies_allocated) {
388                                         if (ksize(ies) < ielen)
389                                                 ies = krealloc(ies, ielen,
390                                                                GFP_ATOMIC);
391                                 } else
392                                         ies = kmalloc(ielen, GFP_ATOMIC);
393
394                                 if (ies) {
395                                         memcpy(ies, res->pub.information_elements, ielen);
396                                         found->ies_allocated = true;
397                                         found->pub.information_elements = ies;
398                                 }
399                         }
400                 }
401
402                 kref_put(&res->ref, bss_release);
403         } else {
404                 /* this "consumes" the reference */
405                 list_add_tail(&res->list, &dev->bss_list);
406                 rb_insert_bss(dev, res);
407                 found = res;
408         }
409
410         dev->bss_generation++;
411         spin_unlock_bh(&dev->bss_lock);
412
413         kref_get(&found->ref);
414         return found;
415 }
416
417 struct cfg80211_bss*
418 cfg80211_inform_bss(struct wiphy *wiphy,
419                     struct ieee80211_channel *channel,
420                     const u8 *bssid,
421                     u64 timestamp, u16 capability, u16 beacon_interval,
422                     const u8 *ie, size_t ielen,
423                     s32 signal, gfp_t gfp)
424 {
425         struct cfg80211_internal_bss *res;
426         size_t privsz;
427
428         if (WARN_ON(!wiphy))
429                 return NULL;
430
431         privsz = wiphy->bss_priv_size;
432
433         if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC &&
434                         (signal < 0 || signal > 100)))
435                 return NULL;
436
437         res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
438         if (!res)
439                 return NULL;
440
441         memcpy(res->pub.bssid, bssid, ETH_ALEN);
442         res->pub.channel = channel;
443         res->pub.signal = signal;
444         res->pub.tsf = timestamp;
445         res->pub.beacon_interval = beacon_interval;
446         res->pub.capability = capability;
447         /* point to after the private area */
448         res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz;
449         memcpy(res->pub.information_elements, ie, ielen);
450         res->pub.len_information_elements = ielen;
451
452         kref_init(&res->ref);
453
454         res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, 0);
455         if (!res)
456                 return NULL;
457
458         if (res->pub.capability & WLAN_CAPABILITY_ESS)
459                 regulatory_hint_found_beacon(wiphy, channel, gfp);
460
461         /* cfg80211_bss_update gives us a referenced result */
462         return &res->pub;
463 }
464 EXPORT_SYMBOL(cfg80211_inform_bss);
465
466 struct cfg80211_bss *
467 cfg80211_inform_bss_frame(struct wiphy *wiphy,
468                           struct ieee80211_channel *channel,
469                           struct ieee80211_mgmt *mgmt, size_t len,
470                           s32 signal, gfp_t gfp)
471 {
472         struct cfg80211_internal_bss *res;
473         size_t ielen = len - offsetof(struct ieee80211_mgmt,
474                                       u.probe_resp.variable);
475         bool overwrite;
476         size_t privsz = wiphy->bss_priv_size;
477
478         if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC &&
479                     (signal < 0 || signal > 100)))
480                 return NULL;
481
482         if (WARN_ON(!mgmt || !wiphy ||
483                     len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
484                 return NULL;
485
486         res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
487         if (!res)
488                 return NULL;
489
490         memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
491         res->pub.channel = channel;
492         res->pub.signal = signal;
493         res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
494         res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
495         res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
496         /* point to after the private area */
497         res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz;
498         memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen);
499         res->pub.len_information_elements = ielen;
500
501         kref_init(&res->ref);
502
503         overwrite = ieee80211_is_probe_resp(mgmt->frame_control);
504
505         res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite);
506         if (!res)
507                 return NULL;
508
509         if (res->pub.capability & WLAN_CAPABILITY_ESS)
510                 regulatory_hint_found_beacon(wiphy, channel, gfp);
511
512         /* cfg80211_bss_update gives us a referenced result */
513         return &res->pub;
514 }
515 EXPORT_SYMBOL(cfg80211_inform_bss_frame);
516
517 void cfg80211_put_bss(struct cfg80211_bss *pub)
518 {
519         struct cfg80211_internal_bss *bss;
520
521         if (!pub)
522                 return;
523
524         bss = container_of(pub, struct cfg80211_internal_bss, pub);
525         kref_put(&bss->ref, bss_release);
526 }
527 EXPORT_SYMBOL(cfg80211_put_bss);
528
529 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
530 {
531         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
532         struct cfg80211_internal_bss *bss;
533
534         if (WARN_ON(!pub))
535                 return;
536
537         bss = container_of(pub, struct cfg80211_internal_bss, pub);
538
539         spin_lock_bh(&dev->bss_lock);
540
541         list_del(&bss->list);
542         rb_erase(&bss->rbn, &dev->bss_tree);
543
544         spin_unlock_bh(&dev->bss_lock);
545
546         kref_put(&bss->ref, bss_release);
547 }
548 EXPORT_SYMBOL(cfg80211_unlink_bss);
549
550 void cfg80211_hold_bss(struct cfg80211_bss *pub)
551 {
552         struct cfg80211_internal_bss *bss;
553
554         if (!pub)
555                 return;
556
557         bss = container_of(pub, struct cfg80211_internal_bss, pub);
558         bss->hold = true;
559 }
560 EXPORT_SYMBOL(cfg80211_hold_bss);
561
562 void cfg80211_unhold_bss(struct cfg80211_bss *pub)
563 {
564         struct cfg80211_internal_bss *bss;
565
566         if (!pub)
567                 return;
568
569         bss = container_of(pub, struct cfg80211_internal_bss, pub);
570         bss->hold = false;
571 }
572 EXPORT_SYMBOL(cfg80211_unhold_bss);
573
574 #ifdef CONFIG_WIRELESS_EXT
575 int cfg80211_wext_siwscan(struct net_device *dev,
576                           struct iw_request_info *info,
577                           union iwreq_data *wrqu, char *extra)
578 {
579         struct cfg80211_registered_device *rdev;
580         struct wiphy *wiphy;
581         struct iw_scan_req *wreq = NULL;
582         struct cfg80211_scan_request *creq;
583         int i, err, n_channels = 0;
584         enum ieee80211_band band;
585
586         if (!netif_running(dev))
587                 return -ENETDOWN;
588
589         rdev = cfg80211_get_dev_from_ifindex(dev->ifindex);
590
591         if (IS_ERR(rdev))
592                 return PTR_ERR(rdev);
593
594         if (rdev->scan_req) {
595                 err = -EBUSY;
596                 goto out;
597         }
598
599         wiphy = &rdev->wiphy;
600
601         for (band = 0; band < IEEE80211_NUM_BANDS; band++)
602                 if (wiphy->bands[band])
603                         n_channels += wiphy->bands[band]->n_channels;
604
605         creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
606                        n_channels * sizeof(void *),
607                        GFP_ATOMIC);
608         if (!creq) {
609                 err = -ENOMEM;
610                 goto out;
611         }
612
613         creq->wiphy = wiphy;
614         creq->ifidx = dev->ifindex;
615         creq->ssids = (void *)(creq + 1);
616         creq->channels = (void *)(creq->ssids + 1);
617         creq->n_channels = n_channels;
618         creq->n_ssids = 1;
619
620         /* all channels */
621         i = 0;
622         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
623                 int j;
624                 if (!wiphy->bands[band])
625                         continue;
626                 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
627                         creq->channels[i] = &wiphy->bands[band]->channels[j];
628                         i++;
629                 }
630         }
631
632         /* translate scan request */
633         if (wrqu->data.length == sizeof(struct iw_scan_req)) {
634                 wreq = (struct iw_scan_req *)extra;
635
636                 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
637                         if (wreq->essid_len > IEEE80211_MAX_SSID_LEN)
638                                 return -EINVAL;
639                         memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
640                         creq->ssids[0].ssid_len = wreq->essid_len;
641                 }
642                 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
643                         creq->n_ssids = 0;
644         }
645
646         rdev->scan_req = creq;
647         err = rdev->ops->scan(wiphy, dev, creq);
648         if (err) {
649                 rdev->scan_req = NULL;
650                 kfree(creq);
651         }
652  out:
653         cfg80211_put_dev(rdev);
654         return err;
655 }
656 EXPORT_SYMBOL(cfg80211_wext_siwscan);
657
658 static void ieee80211_scan_add_ies(struct iw_request_info *info,
659                                    struct cfg80211_bss *bss,
660                                    char **current_ev, char *end_buf)
661 {
662         u8 *pos, *end, *next;
663         struct iw_event iwe;
664
665         if (!bss->information_elements ||
666             !bss->len_information_elements)
667                 return;
668
669         /*
670          * If needed, fragment the IEs buffer (at IE boundaries) into short
671          * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
672          */
673         pos = bss->information_elements;
674         end = pos + bss->len_information_elements;
675
676         while (end - pos > IW_GENERIC_IE_MAX) {
677                 next = pos + 2 + pos[1];
678                 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
679                         next = next + 2 + next[1];
680
681                 memset(&iwe, 0, sizeof(iwe));
682                 iwe.cmd = IWEVGENIE;
683                 iwe.u.data.length = next - pos;
684                 *current_ev = iwe_stream_add_point(info, *current_ev,
685                                                    end_buf, &iwe, pos);
686
687                 pos = next;
688         }
689
690         if (end > pos) {
691                 memset(&iwe, 0, sizeof(iwe));
692                 iwe.cmd = IWEVGENIE;
693                 iwe.u.data.length = end - pos;
694                 *current_ev = iwe_stream_add_point(info, *current_ev,
695                                                    end_buf, &iwe, pos);
696         }
697 }
698
699 static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
700 {
701         unsigned long end = jiffies;
702
703         if (end >= start)
704                 return jiffies_to_msecs(end - start);
705
706         return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
707 }
708
709 static char *
710 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
711               struct cfg80211_internal_bss *bss, char *current_ev,
712               char *end_buf)
713 {
714         struct iw_event iwe;
715         u8 *buf, *cfg, *p;
716         u8 *ie = bss->pub.information_elements;
717         int rem = bss->pub.len_information_elements, i, sig;
718         bool ismesh = false;
719
720         memset(&iwe, 0, sizeof(iwe));
721         iwe.cmd = SIOCGIWAP;
722         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
723         memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
724         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
725                                           IW_EV_ADDR_LEN);
726
727         memset(&iwe, 0, sizeof(iwe));
728         iwe.cmd = SIOCGIWFREQ;
729         iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
730         iwe.u.freq.e = 0;
731         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
732                                           IW_EV_FREQ_LEN);
733
734         memset(&iwe, 0, sizeof(iwe));
735         iwe.cmd = SIOCGIWFREQ;
736         iwe.u.freq.m = bss->pub.channel->center_freq;
737         iwe.u.freq.e = 6;
738         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
739                                           IW_EV_FREQ_LEN);
740
741         if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
742                 memset(&iwe, 0, sizeof(iwe));
743                 iwe.cmd = IWEVQUAL;
744                 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
745                                      IW_QUAL_NOISE_INVALID |
746                                      IW_QUAL_QUAL_UPDATED;
747                 switch (wiphy->signal_type) {
748                 case CFG80211_SIGNAL_TYPE_MBM:
749                         sig = bss->pub.signal / 100;
750                         iwe.u.qual.level = sig;
751                         iwe.u.qual.updated |= IW_QUAL_DBM;
752                         if (sig < -110)         /* rather bad */
753                                 sig = -110;
754                         else if (sig > -40)     /* perfect */
755                                 sig = -40;
756                         /* will give a range of 0 .. 70 */
757                         iwe.u.qual.qual = sig + 110;
758                         break;
759                 case CFG80211_SIGNAL_TYPE_UNSPEC:
760                         iwe.u.qual.level = bss->pub.signal;
761                         /* will give range 0 .. 100 */
762                         iwe.u.qual.qual = bss->pub.signal;
763                         break;
764                 default:
765                         /* not reached */
766                         break;
767                 }
768                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
769                                                   &iwe, IW_EV_QUAL_LEN);
770         }
771
772         memset(&iwe, 0, sizeof(iwe));
773         iwe.cmd = SIOCGIWENCODE;
774         if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
775                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
776         else
777                 iwe.u.data.flags = IW_ENCODE_DISABLED;
778         iwe.u.data.length = 0;
779         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
780                                           &iwe, "");
781
782         while (rem >= 2) {
783                 /* invalid data */
784                 if (ie[1] > rem - 2)
785                         break;
786
787                 switch (ie[0]) {
788                 case WLAN_EID_SSID:
789                         memset(&iwe, 0, sizeof(iwe));
790                         iwe.cmd = SIOCGIWESSID;
791                         iwe.u.data.length = ie[1];
792                         iwe.u.data.flags = 1;
793                         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
794                                                           &iwe, ie + 2);
795                         break;
796                 case WLAN_EID_MESH_ID:
797                         memset(&iwe, 0, sizeof(iwe));
798                         iwe.cmd = SIOCGIWESSID;
799                         iwe.u.data.length = ie[1];
800                         iwe.u.data.flags = 1;
801                         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
802                                                           &iwe, ie + 2);
803                         break;
804                 case WLAN_EID_MESH_CONFIG:
805                         ismesh = true;
806                         if (ie[1] != IEEE80211_MESH_CONFIG_LEN)
807                                 break;
808                         buf = kmalloc(50, GFP_ATOMIC);
809                         if (!buf)
810                                 break;
811                         cfg = ie + 2;
812                         memset(&iwe, 0, sizeof(iwe));
813                         iwe.cmd = IWEVCUSTOM;
814                         sprintf(buf, "Mesh network (version %d)", cfg[0]);
815                         iwe.u.data.length = strlen(buf);
816                         current_ev = iwe_stream_add_point(info, current_ev,
817                                                           end_buf,
818                                                           &iwe, buf);
819                         sprintf(buf, "Path Selection Protocol ID: "
820                                 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
821                                                         cfg[4]);
822                         iwe.u.data.length = strlen(buf);
823                         current_ev = iwe_stream_add_point(info, current_ev,
824                                                           end_buf,
825                                                           &iwe, buf);
826                         sprintf(buf, "Path Selection Metric ID: "
827                                 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
828                                                         cfg[8]);
829                         iwe.u.data.length = strlen(buf);
830                         current_ev = iwe_stream_add_point(info, current_ev,
831                                                           end_buf,
832                                                           &iwe, buf);
833                         sprintf(buf, "Congestion Control Mode ID: "
834                                 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
835                                                         cfg[11], cfg[12]);
836                         iwe.u.data.length = strlen(buf);
837                         current_ev = iwe_stream_add_point(info, current_ev,
838                                                           end_buf,
839                                                           &iwe, buf);
840                         sprintf(buf, "Channel Precedence: "
841                                 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
842                                                         cfg[15], cfg[16]);
843                         iwe.u.data.length = strlen(buf);
844                         current_ev = iwe_stream_add_point(info, current_ev,
845                                                           end_buf,
846                                                           &iwe, buf);
847                         kfree(buf);
848                         break;
849                 case WLAN_EID_SUPP_RATES:
850                 case WLAN_EID_EXT_SUPP_RATES:
851                         /* display all supported rates in readable format */
852                         p = current_ev + iwe_stream_lcp_len(info);
853
854                         memset(&iwe, 0, sizeof(iwe));
855                         iwe.cmd = SIOCGIWRATE;
856                         /* Those two flags are ignored... */
857                         iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
858
859                         for (i = 0; i < ie[1]; i++) {
860                                 iwe.u.bitrate.value =
861                                         ((ie[i + 2] & 0x7f) * 500000);
862                                 p = iwe_stream_add_value(info, current_ev, p,
863                                                 end_buf, &iwe, IW_EV_PARAM_LEN);
864                         }
865                         current_ev = p;
866                         break;
867                 }
868                 rem -= ie[1] + 2;
869                 ie += ie[1] + 2;
870         }
871
872         if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
873             || ismesh) {
874                 memset(&iwe, 0, sizeof(iwe));
875                 iwe.cmd = SIOCGIWMODE;
876                 if (ismesh)
877                         iwe.u.mode = IW_MODE_MESH;
878                 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
879                         iwe.u.mode = IW_MODE_MASTER;
880                 else
881                         iwe.u.mode = IW_MODE_ADHOC;
882                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
883                                                   &iwe, IW_EV_UINT_LEN);
884         }
885
886         buf = kmalloc(30, GFP_ATOMIC);
887         if (buf) {
888                 memset(&iwe, 0, sizeof(iwe));
889                 iwe.cmd = IWEVCUSTOM;
890                 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
891                 iwe.u.data.length = strlen(buf);
892                 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
893                                                   &iwe, buf);
894                 memset(&iwe, 0, sizeof(iwe));
895                 iwe.cmd = IWEVCUSTOM;
896                 sprintf(buf, " Last beacon: %ums ago",
897                         elapsed_jiffies_msecs(bss->ts));
898                 iwe.u.data.length = strlen(buf);
899                 current_ev = iwe_stream_add_point(info, current_ev,
900                                                   end_buf, &iwe, buf);
901                 kfree(buf);
902         }
903
904         ieee80211_scan_add_ies(info, &bss->pub, &current_ev, end_buf);
905
906         return current_ev;
907 }
908
909
910 static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
911                                   struct iw_request_info *info,
912                                   char *buf, size_t len)
913 {
914         char *current_ev = buf;
915         char *end_buf = buf + len;
916         struct cfg80211_internal_bss *bss;
917
918         spin_lock_bh(&dev->bss_lock);
919         cfg80211_bss_expire(dev);
920
921         list_for_each_entry(bss, &dev->bss_list, list) {
922                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
923                         spin_unlock_bh(&dev->bss_lock);
924                         return -E2BIG;
925                 }
926                 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
927                                            current_ev, end_buf);
928         }
929         spin_unlock_bh(&dev->bss_lock);
930         return current_ev - buf;
931 }
932
933
934 int cfg80211_wext_giwscan(struct net_device *dev,
935                           struct iw_request_info *info,
936                           struct iw_point *data, char *extra)
937 {
938         struct cfg80211_registered_device *rdev;
939         int res;
940
941         if (!netif_running(dev))
942                 return -ENETDOWN;
943
944         rdev = cfg80211_get_dev_from_ifindex(dev->ifindex);
945
946         if (IS_ERR(rdev))
947                 return PTR_ERR(rdev);
948
949         if (rdev->scan_req) {
950                 res = -EAGAIN;
951                 goto out;
952         }
953
954         res = ieee80211_scan_results(rdev, info, extra, data->length);
955         data->length = 0;
956         if (res >= 0) {
957                 data->length = res;
958                 res = 0;
959         }
960
961  out:
962         cfg80211_put_dev(rdev);
963         return res;
964 }
965 EXPORT_SYMBOL(cfg80211_wext_giwscan);
966 #endif