Merge branch 'fix/misc' into for-linus
[linux-2.6] / 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_frame(struct wiphy *wiphy,
419                           struct ieee80211_channel *channel,
420                           struct ieee80211_mgmt *mgmt, size_t len,
421                           s32 signal, gfp_t gfp)
422 {
423         struct cfg80211_internal_bss *res;
424         size_t ielen = len - offsetof(struct ieee80211_mgmt,
425                                       u.probe_resp.variable);
426         bool overwrite;
427         size_t privsz = wiphy->bss_priv_size;
428
429         if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC &&
430                     (signal < 0 || signal > 100)))
431                 return NULL;
432
433         if (WARN_ON(!mgmt || !wiphy ||
434                     len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
435                 return NULL;
436
437         res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
438         if (!res)
439                 return NULL;
440
441         memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
442         res->pub.channel = channel;
443         res->pub.signal = signal;
444         res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
445         res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
446         res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
447         /* point to after the private area */
448         res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz;
449         memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen);
450         res->pub.len_information_elements = ielen;
451
452         kref_init(&res->ref);
453
454         overwrite = ieee80211_is_probe_resp(mgmt->frame_control);
455
456         res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite);
457         if (!res)
458                 return NULL;
459
460         if (res->pub.capability & WLAN_CAPABILITY_ESS)
461                 regulatory_hint_found_beacon(wiphy, channel, gfp);
462
463         /* cfg80211_bss_update gives us a referenced result */
464         return &res->pub;
465 }
466 EXPORT_SYMBOL(cfg80211_inform_bss_frame);
467
468 void cfg80211_put_bss(struct cfg80211_bss *pub)
469 {
470         struct cfg80211_internal_bss *bss;
471
472         if (!pub)
473                 return;
474
475         bss = container_of(pub, struct cfg80211_internal_bss, pub);
476         kref_put(&bss->ref, bss_release);
477 }
478 EXPORT_SYMBOL(cfg80211_put_bss);
479
480 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
481 {
482         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
483         struct cfg80211_internal_bss *bss;
484
485         if (WARN_ON(!pub))
486                 return;
487
488         bss = container_of(pub, struct cfg80211_internal_bss, pub);
489
490         spin_lock_bh(&dev->bss_lock);
491
492         list_del(&bss->list);
493         rb_erase(&bss->rbn, &dev->bss_tree);
494
495         spin_unlock_bh(&dev->bss_lock);
496
497         kref_put(&bss->ref, bss_release);
498 }
499 EXPORT_SYMBOL(cfg80211_unlink_bss);
500
501 void cfg80211_hold_bss(struct cfg80211_bss *pub)
502 {
503         struct cfg80211_internal_bss *bss;
504
505         if (!pub)
506                 return;
507
508         bss = container_of(pub, struct cfg80211_internal_bss, pub);
509         bss->hold = true;
510 }
511 EXPORT_SYMBOL(cfg80211_hold_bss);
512
513 void cfg80211_unhold_bss(struct cfg80211_bss *pub)
514 {
515         struct cfg80211_internal_bss *bss;
516
517         if (!pub)
518                 return;
519
520         bss = container_of(pub, struct cfg80211_internal_bss, pub);
521         bss->hold = false;
522 }
523 EXPORT_SYMBOL(cfg80211_unhold_bss);
524
525 #ifdef CONFIG_WIRELESS_EXT
526 int cfg80211_wext_siwscan(struct net_device *dev,
527                           struct iw_request_info *info,
528                           union iwreq_data *wrqu, char *extra)
529 {
530         struct cfg80211_registered_device *rdev;
531         struct wiphy *wiphy;
532         struct iw_scan_req *wreq = NULL;
533         struct cfg80211_scan_request *creq;
534         int i, err, n_channels = 0;
535         enum ieee80211_band band;
536
537         if (!netif_running(dev))
538                 return -ENETDOWN;
539
540         rdev = cfg80211_get_dev_from_ifindex(dev->ifindex);
541
542         if (IS_ERR(rdev))
543                 return PTR_ERR(rdev);
544
545         if (rdev->scan_req) {
546                 err = -EBUSY;
547                 goto out;
548         }
549
550         wiphy = &rdev->wiphy;
551
552         for (band = 0; band < IEEE80211_NUM_BANDS; band++)
553                 if (wiphy->bands[band])
554                         n_channels += wiphy->bands[band]->n_channels;
555
556         creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
557                        n_channels * sizeof(void *),
558                        GFP_ATOMIC);
559         if (!creq) {
560                 err = -ENOMEM;
561                 goto out;
562         }
563
564         creq->wiphy = wiphy;
565         creq->ifidx = dev->ifindex;
566         creq->ssids = (void *)(creq + 1);
567         creq->channels = (void *)(creq->ssids + 1);
568         creq->n_channels = n_channels;
569         creq->n_ssids = 1;
570
571         /* all channels */
572         i = 0;
573         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
574                 int j;
575                 if (!wiphy->bands[band])
576                         continue;
577                 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
578                         creq->channels[i] = &wiphy->bands[band]->channels[j];
579                         i++;
580                 }
581         }
582
583         /* translate scan request */
584         if (wrqu->data.length == sizeof(struct iw_scan_req)) {
585                 wreq = (struct iw_scan_req *)extra;
586
587                 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
588                         if (wreq->essid_len > IEEE80211_MAX_SSID_LEN)
589                                 return -EINVAL;
590                         memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
591                         creq->ssids[0].ssid_len = wreq->essid_len;
592                 }
593                 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
594                         creq->n_ssids = 0;
595         }
596
597         rdev->scan_req = creq;
598         err = rdev->ops->scan(wiphy, dev, creq);
599         if (err) {
600                 rdev->scan_req = NULL;
601                 kfree(creq);
602         }
603  out:
604         cfg80211_put_dev(rdev);
605         return err;
606 }
607 EXPORT_SYMBOL(cfg80211_wext_siwscan);
608
609 static void ieee80211_scan_add_ies(struct iw_request_info *info,
610                                    struct cfg80211_bss *bss,
611                                    char **current_ev, char *end_buf)
612 {
613         u8 *pos, *end, *next;
614         struct iw_event iwe;
615
616         if (!bss->information_elements ||
617             !bss->len_information_elements)
618                 return;
619
620         /*
621          * If needed, fragment the IEs buffer (at IE boundaries) into short
622          * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
623          */
624         pos = bss->information_elements;
625         end = pos + bss->len_information_elements;
626
627         while (end - pos > IW_GENERIC_IE_MAX) {
628                 next = pos + 2 + pos[1];
629                 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
630                         next = next + 2 + next[1];
631
632                 memset(&iwe, 0, sizeof(iwe));
633                 iwe.cmd = IWEVGENIE;
634                 iwe.u.data.length = next - pos;
635                 *current_ev = iwe_stream_add_point(info, *current_ev,
636                                                    end_buf, &iwe, pos);
637
638                 pos = next;
639         }
640
641         if (end > pos) {
642                 memset(&iwe, 0, sizeof(iwe));
643                 iwe.cmd = IWEVGENIE;
644                 iwe.u.data.length = end - pos;
645                 *current_ev = iwe_stream_add_point(info, *current_ev,
646                                                    end_buf, &iwe, pos);
647         }
648 }
649
650 static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
651 {
652         unsigned long end = jiffies;
653
654         if (end >= start)
655                 return jiffies_to_msecs(end - start);
656
657         return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
658 }
659
660 static char *
661 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
662               struct cfg80211_internal_bss *bss, char *current_ev,
663               char *end_buf)
664 {
665         struct iw_event iwe;
666         u8 *buf, *cfg, *p;
667         u8 *ie = bss->pub.information_elements;
668         int rem = bss->pub.len_information_elements, i, sig;
669         bool ismesh = false;
670
671         memset(&iwe, 0, sizeof(iwe));
672         iwe.cmd = SIOCGIWAP;
673         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
674         memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
675         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
676                                           IW_EV_ADDR_LEN);
677
678         memset(&iwe, 0, sizeof(iwe));
679         iwe.cmd = SIOCGIWFREQ;
680         iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
681         iwe.u.freq.e = 0;
682         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
683                                           IW_EV_FREQ_LEN);
684
685         memset(&iwe, 0, sizeof(iwe));
686         iwe.cmd = SIOCGIWFREQ;
687         iwe.u.freq.m = bss->pub.channel->center_freq;
688         iwe.u.freq.e = 6;
689         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
690                                           IW_EV_FREQ_LEN);
691
692         if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
693                 memset(&iwe, 0, sizeof(iwe));
694                 iwe.cmd = IWEVQUAL;
695                 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
696                                      IW_QUAL_NOISE_INVALID |
697                                      IW_QUAL_QUAL_UPDATED;
698                 switch (wiphy->signal_type) {
699                 case CFG80211_SIGNAL_TYPE_MBM:
700                         sig = bss->pub.signal / 100;
701                         iwe.u.qual.level = sig;
702                         iwe.u.qual.updated |= IW_QUAL_DBM;
703                         if (sig < -110)         /* rather bad */
704                                 sig = -110;
705                         else if (sig > -40)     /* perfect */
706                                 sig = -40;
707                         /* will give a range of 0 .. 70 */
708                         iwe.u.qual.qual = sig + 110;
709                         break;
710                 case CFG80211_SIGNAL_TYPE_UNSPEC:
711                         iwe.u.qual.level = bss->pub.signal;
712                         /* will give range 0 .. 100 */
713                         iwe.u.qual.qual = bss->pub.signal;
714                         break;
715                 default:
716                         /* not reached */
717                         break;
718                 }
719                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
720                                                   &iwe, IW_EV_QUAL_LEN);
721         }
722
723         memset(&iwe, 0, sizeof(iwe));
724         iwe.cmd = SIOCGIWENCODE;
725         if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
726                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
727         else
728                 iwe.u.data.flags = IW_ENCODE_DISABLED;
729         iwe.u.data.length = 0;
730         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
731                                           &iwe, "");
732
733         while (rem >= 2) {
734                 /* invalid data */
735                 if (ie[1] > rem - 2)
736                         break;
737
738                 switch (ie[0]) {
739                 case WLAN_EID_SSID:
740                         memset(&iwe, 0, sizeof(iwe));
741                         iwe.cmd = SIOCGIWESSID;
742                         iwe.u.data.length = ie[1];
743                         iwe.u.data.flags = 1;
744                         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
745                                                           &iwe, ie + 2);
746                         break;
747                 case WLAN_EID_MESH_ID:
748                         memset(&iwe, 0, sizeof(iwe));
749                         iwe.cmd = SIOCGIWESSID;
750                         iwe.u.data.length = ie[1];
751                         iwe.u.data.flags = 1;
752                         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
753                                                           &iwe, ie + 2);
754                         break;
755                 case WLAN_EID_MESH_CONFIG:
756                         ismesh = true;
757                         if (ie[1] != IEEE80211_MESH_CONFIG_LEN)
758                                 break;
759                         buf = kmalloc(50, GFP_ATOMIC);
760                         if (!buf)
761                                 break;
762                         cfg = ie + 2;
763                         memset(&iwe, 0, sizeof(iwe));
764                         iwe.cmd = IWEVCUSTOM;
765                         sprintf(buf, "Mesh network (version %d)", cfg[0]);
766                         iwe.u.data.length = strlen(buf);
767                         current_ev = iwe_stream_add_point(info, current_ev,
768                                                           end_buf,
769                                                           &iwe, buf);
770                         sprintf(buf, "Path Selection Protocol ID: "
771                                 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
772                                                         cfg[4]);
773                         iwe.u.data.length = strlen(buf);
774                         current_ev = iwe_stream_add_point(info, current_ev,
775                                                           end_buf,
776                                                           &iwe, buf);
777                         sprintf(buf, "Path Selection Metric ID: "
778                                 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
779                                                         cfg[8]);
780                         iwe.u.data.length = strlen(buf);
781                         current_ev = iwe_stream_add_point(info, current_ev,
782                                                           end_buf,
783                                                           &iwe, buf);
784                         sprintf(buf, "Congestion Control Mode ID: "
785                                 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
786                                                         cfg[11], cfg[12]);
787                         iwe.u.data.length = strlen(buf);
788                         current_ev = iwe_stream_add_point(info, current_ev,
789                                                           end_buf,
790                                                           &iwe, buf);
791                         sprintf(buf, "Channel Precedence: "
792                                 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
793                                                         cfg[15], cfg[16]);
794                         iwe.u.data.length = strlen(buf);
795                         current_ev = iwe_stream_add_point(info, current_ev,
796                                                           end_buf,
797                                                           &iwe, buf);
798                         kfree(buf);
799                         break;
800                 case WLAN_EID_SUPP_RATES:
801                 case WLAN_EID_EXT_SUPP_RATES:
802                         /* display all supported rates in readable format */
803                         p = current_ev + iwe_stream_lcp_len(info);
804
805                         memset(&iwe, 0, sizeof(iwe));
806                         iwe.cmd = SIOCGIWRATE;
807                         /* Those two flags are ignored... */
808                         iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
809
810                         for (i = 0; i < ie[1]; i++) {
811                                 iwe.u.bitrate.value =
812                                         ((ie[i + 2] & 0x7f) * 500000);
813                                 p = iwe_stream_add_value(info, current_ev, p,
814                                                 end_buf, &iwe, IW_EV_PARAM_LEN);
815                         }
816                         current_ev = p;
817                         break;
818                 }
819                 rem -= ie[1] + 2;
820                 ie += ie[1] + 2;
821         }
822
823         if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
824             || ismesh) {
825                 memset(&iwe, 0, sizeof(iwe));
826                 iwe.cmd = SIOCGIWMODE;
827                 if (ismesh)
828                         iwe.u.mode = IW_MODE_MESH;
829                 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
830                         iwe.u.mode = IW_MODE_MASTER;
831                 else
832                         iwe.u.mode = IW_MODE_ADHOC;
833                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
834                                                   &iwe, IW_EV_UINT_LEN);
835         }
836
837         buf = kmalloc(30, GFP_ATOMIC);
838         if (buf) {
839                 memset(&iwe, 0, sizeof(iwe));
840                 iwe.cmd = IWEVCUSTOM;
841                 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
842                 iwe.u.data.length = strlen(buf);
843                 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
844                                                   &iwe, buf);
845                 memset(&iwe, 0, sizeof(iwe));
846                 iwe.cmd = IWEVCUSTOM;
847                 sprintf(buf, " Last beacon: %ums ago",
848                         elapsed_jiffies_msecs(bss->ts));
849                 iwe.u.data.length = strlen(buf);
850                 current_ev = iwe_stream_add_point(info, current_ev,
851                                                   end_buf, &iwe, buf);
852                 kfree(buf);
853         }
854
855         ieee80211_scan_add_ies(info, &bss->pub, &current_ev, end_buf);
856
857         return current_ev;
858 }
859
860
861 static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
862                                   struct iw_request_info *info,
863                                   char *buf, size_t len)
864 {
865         char *current_ev = buf;
866         char *end_buf = buf + len;
867         struct cfg80211_internal_bss *bss;
868
869         spin_lock_bh(&dev->bss_lock);
870         cfg80211_bss_expire(dev);
871
872         list_for_each_entry(bss, &dev->bss_list, list) {
873                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
874                         spin_unlock_bh(&dev->bss_lock);
875                         return -E2BIG;
876                 }
877                 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
878                                            current_ev, end_buf);
879         }
880         spin_unlock_bh(&dev->bss_lock);
881         return current_ev - buf;
882 }
883
884
885 int cfg80211_wext_giwscan(struct net_device *dev,
886                           struct iw_request_info *info,
887                           struct iw_point *data, char *extra)
888 {
889         struct cfg80211_registered_device *rdev;
890         int res;
891
892         if (!netif_running(dev))
893                 return -ENETDOWN;
894
895         rdev = cfg80211_get_dev_from_ifindex(dev->ifindex);
896
897         if (IS_ERR(rdev))
898                 return PTR_ERR(rdev);
899
900         if (rdev->scan_req) {
901                 res = -EAGAIN;
902                 goto out;
903         }
904
905         res = ieee80211_scan_results(rdev, info, extra, data->length);
906         data->length = 0;
907         if (res >= 0) {
908                 data->length = res;
909                 res = 0;
910         }
911
912  out:
913         cfg80211_put_dev(rdev);
914         return res;
915 }
916 EXPORT_SYMBOL(cfg80211_wext_giwscan);
917 #endif