cfg80211: fix truncated IEs
[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                                         found->pub.len_information_elements = ielen;
399                                 }
400                         }
401                 }
402
403                 kref_put(&res->ref, bss_release);
404         } else {
405                 /* this "consumes" the reference */
406                 list_add_tail(&res->list, &dev->bss_list);
407                 rb_insert_bss(dev, res);
408                 found = res;
409         }
410
411         dev->bss_generation++;
412         spin_unlock_bh(&dev->bss_lock);
413
414         kref_get(&found->ref);
415         return found;
416 }
417
418 struct cfg80211_bss *
419 cfg80211_inform_bss_frame(struct wiphy *wiphy,
420                           struct ieee80211_channel *channel,
421                           struct ieee80211_mgmt *mgmt, size_t len,
422                           s32 signal, gfp_t gfp)
423 {
424         struct cfg80211_internal_bss *res;
425         size_t ielen = len - offsetof(struct ieee80211_mgmt,
426                                       u.probe_resp.variable);
427         bool overwrite;
428         size_t privsz = wiphy->bss_priv_size;
429
430         if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC &&
431                     (signal < 0 || signal > 100)))
432                 return NULL;
433
434         if (WARN_ON(!mgmt || !wiphy ||
435                     len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
436                 return NULL;
437
438         res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
439         if (!res)
440                 return NULL;
441
442         memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
443         res->pub.channel = channel;
444         res->pub.signal = signal;
445         res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
446         res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
447         res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
448         /* point to after the private area */
449         res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz;
450         memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen);
451         res->pub.len_information_elements = ielen;
452
453         kref_init(&res->ref);
454
455         overwrite = ieee80211_is_probe_resp(mgmt->frame_control);
456
457         res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite);
458         if (!res)
459                 return NULL;
460
461         if (res->pub.capability & WLAN_CAPABILITY_ESS)
462                 regulatory_hint_found_beacon(wiphy, channel, gfp);
463
464         /* cfg80211_bss_update gives us a referenced result */
465         return &res->pub;
466 }
467 EXPORT_SYMBOL(cfg80211_inform_bss_frame);
468
469 void cfg80211_put_bss(struct cfg80211_bss *pub)
470 {
471         struct cfg80211_internal_bss *bss;
472
473         if (!pub)
474                 return;
475
476         bss = container_of(pub, struct cfg80211_internal_bss, pub);
477         kref_put(&bss->ref, bss_release);
478 }
479 EXPORT_SYMBOL(cfg80211_put_bss);
480
481 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
482 {
483         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
484         struct cfg80211_internal_bss *bss;
485
486         if (WARN_ON(!pub))
487                 return;
488
489         bss = container_of(pub, struct cfg80211_internal_bss, pub);
490
491         spin_lock_bh(&dev->bss_lock);
492
493         list_del(&bss->list);
494         rb_erase(&bss->rbn, &dev->bss_tree);
495
496         spin_unlock_bh(&dev->bss_lock);
497
498         kref_put(&bss->ref, bss_release);
499 }
500 EXPORT_SYMBOL(cfg80211_unlink_bss);
501
502 void cfg80211_hold_bss(struct cfg80211_bss *pub)
503 {
504         struct cfg80211_internal_bss *bss;
505
506         if (!pub)
507                 return;
508
509         bss = container_of(pub, struct cfg80211_internal_bss, pub);
510         bss->hold = true;
511 }
512 EXPORT_SYMBOL(cfg80211_hold_bss);
513
514 void cfg80211_unhold_bss(struct cfg80211_bss *pub)
515 {
516         struct cfg80211_internal_bss *bss;
517
518         if (!pub)
519                 return;
520
521         bss = container_of(pub, struct cfg80211_internal_bss, pub);
522         bss->hold = false;
523 }
524 EXPORT_SYMBOL(cfg80211_unhold_bss);
525
526 #ifdef CONFIG_WIRELESS_EXT
527 int cfg80211_wext_siwscan(struct net_device *dev,
528                           struct iw_request_info *info,
529                           union iwreq_data *wrqu, char *extra)
530 {
531         struct cfg80211_registered_device *rdev;
532         struct wiphy *wiphy;
533         struct iw_scan_req *wreq = NULL;
534         struct cfg80211_scan_request *creq;
535         int i, err, n_channels = 0;
536         enum ieee80211_band band;
537
538         if (!netif_running(dev))
539                 return -ENETDOWN;
540
541         rdev = cfg80211_get_dev_from_ifindex(dev->ifindex);
542
543         if (IS_ERR(rdev))
544                 return PTR_ERR(rdev);
545
546         if (rdev->scan_req) {
547                 err = -EBUSY;
548                 goto out;
549         }
550
551         wiphy = &rdev->wiphy;
552
553         for (band = 0; band < IEEE80211_NUM_BANDS; band++)
554                 if (wiphy->bands[band])
555                         n_channels += wiphy->bands[band]->n_channels;
556
557         creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
558                        n_channels * sizeof(void *),
559                        GFP_ATOMIC);
560         if (!creq) {
561                 err = -ENOMEM;
562                 goto out;
563         }
564
565         creq->wiphy = wiphy;
566         creq->ifidx = dev->ifindex;
567         creq->ssids = (void *)(creq + 1);
568         creq->channels = (void *)(creq->ssids + 1);
569         creq->n_channels = n_channels;
570         creq->n_ssids = 1;
571
572         /* all channels */
573         i = 0;
574         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
575                 int j;
576                 if (!wiphy->bands[band])
577                         continue;
578                 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
579                         creq->channels[i] = &wiphy->bands[band]->channels[j];
580                         i++;
581                 }
582         }
583
584         /* translate scan request */
585         if (wrqu->data.length == sizeof(struct iw_scan_req)) {
586                 wreq = (struct iw_scan_req *)extra;
587
588                 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
589                         if (wreq->essid_len > IEEE80211_MAX_SSID_LEN)
590                                 return -EINVAL;
591                         memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
592                         creq->ssids[0].ssid_len = wreq->essid_len;
593                 }
594                 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
595                         creq->n_ssids = 0;
596         }
597
598         rdev->scan_req = creq;
599         err = rdev->ops->scan(wiphy, dev, creq);
600         if (err) {
601                 rdev->scan_req = NULL;
602                 kfree(creq);
603         }
604  out:
605         cfg80211_put_dev(rdev);
606         return err;
607 }
608 EXPORT_SYMBOL(cfg80211_wext_siwscan);
609
610 static void ieee80211_scan_add_ies(struct iw_request_info *info,
611                                    struct cfg80211_bss *bss,
612                                    char **current_ev, char *end_buf)
613 {
614         u8 *pos, *end, *next;
615         struct iw_event iwe;
616
617         if (!bss->information_elements ||
618             !bss->len_information_elements)
619                 return;
620
621         /*
622          * If needed, fragment the IEs buffer (at IE boundaries) into short
623          * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
624          */
625         pos = bss->information_elements;
626         end = pos + bss->len_information_elements;
627
628         while (end - pos > IW_GENERIC_IE_MAX) {
629                 next = pos + 2 + pos[1];
630                 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
631                         next = next + 2 + next[1];
632
633                 memset(&iwe, 0, sizeof(iwe));
634                 iwe.cmd = IWEVGENIE;
635                 iwe.u.data.length = next - pos;
636                 *current_ev = iwe_stream_add_point(info, *current_ev,
637                                                    end_buf, &iwe, pos);
638
639                 pos = next;
640         }
641
642         if (end > pos) {
643                 memset(&iwe, 0, sizeof(iwe));
644                 iwe.cmd = IWEVGENIE;
645                 iwe.u.data.length = end - pos;
646                 *current_ev = iwe_stream_add_point(info, *current_ev,
647                                                    end_buf, &iwe, pos);
648         }
649 }
650
651 static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
652 {
653         unsigned long end = jiffies;
654
655         if (end >= start)
656                 return jiffies_to_msecs(end - start);
657
658         return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
659 }
660
661 static char *
662 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
663               struct cfg80211_internal_bss *bss, char *current_ev,
664               char *end_buf)
665 {
666         struct iw_event iwe;
667         u8 *buf, *cfg, *p;
668         u8 *ie = bss->pub.information_elements;
669         int rem = bss->pub.len_information_elements, i, sig;
670         bool ismesh = false;
671
672         memset(&iwe, 0, sizeof(iwe));
673         iwe.cmd = SIOCGIWAP;
674         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
675         memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
676         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
677                                           IW_EV_ADDR_LEN);
678
679         memset(&iwe, 0, sizeof(iwe));
680         iwe.cmd = SIOCGIWFREQ;
681         iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
682         iwe.u.freq.e = 0;
683         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
684                                           IW_EV_FREQ_LEN);
685
686         memset(&iwe, 0, sizeof(iwe));
687         iwe.cmd = SIOCGIWFREQ;
688         iwe.u.freq.m = bss->pub.channel->center_freq;
689         iwe.u.freq.e = 6;
690         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
691                                           IW_EV_FREQ_LEN);
692
693         if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
694                 memset(&iwe, 0, sizeof(iwe));
695                 iwe.cmd = IWEVQUAL;
696                 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
697                                      IW_QUAL_NOISE_INVALID |
698                                      IW_QUAL_QUAL_UPDATED;
699                 switch (wiphy->signal_type) {
700                 case CFG80211_SIGNAL_TYPE_MBM:
701                         sig = bss->pub.signal / 100;
702                         iwe.u.qual.level = sig;
703                         iwe.u.qual.updated |= IW_QUAL_DBM;
704                         if (sig < -110)         /* rather bad */
705                                 sig = -110;
706                         else if (sig > -40)     /* perfect */
707                                 sig = -40;
708                         /* will give a range of 0 .. 70 */
709                         iwe.u.qual.qual = sig + 110;
710                         break;
711                 case CFG80211_SIGNAL_TYPE_UNSPEC:
712                         iwe.u.qual.level = bss->pub.signal;
713                         /* will give range 0 .. 100 */
714                         iwe.u.qual.qual = bss->pub.signal;
715                         break;
716                 default:
717                         /* not reached */
718                         break;
719                 }
720                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
721                                                   &iwe, IW_EV_QUAL_LEN);
722         }
723
724         memset(&iwe, 0, sizeof(iwe));
725         iwe.cmd = SIOCGIWENCODE;
726         if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
727                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
728         else
729                 iwe.u.data.flags = IW_ENCODE_DISABLED;
730         iwe.u.data.length = 0;
731         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
732                                           &iwe, "");
733
734         while (rem >= 2) {
735                 /* invalid data */
736                 if (ie[1] > rem - 2)
737                         break;
738
739                 switch (ie[0]) {
740                 case WLAN_EID_SSID:
741                         memset(&iwe, 0, sizeof(iwe));
742                         iwe.cmd = SIOCGIWESSID;
743                         iwe.u.data.length = ie[1];
744                         iwe.u.data.flags = 1;
745                         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
746                                                           &iwe, ie + 2);
747                         break;
748                 case WLAN_EID_MESH_ID:
749                         memset(&iwe, 0, sizeof(iwe));
750                         iwe.cmd = SIOCGIWESSID;
751                         iwe.u.data.length = ie[1];
752                         iwe.u.data.flags = 1;
753                         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
754                                                           &iwe, ie + 2);
755                         break;
756                 case WLAN_EID_MESH_CONFIG:
757                         ismesh = true;
758                         if (ie[1] != IEEE80211_MESH_CONFIG_LEN)
759                                 break;
760                         buf = kmalloc(50, GFP_ATOMIC);
761                         if (!buf)
762                                 break;
763                         cfg = ie + 2;
764                         memset(&iwe, 0, sizeof(iwe));
765                         iwe.cmd = IWEVCUSTOM;
766                         sprintf(buf, "Mesh network (version %d)", cfg[0]);
767                         iwe.u.data.length = strlen(buf);
768                         current_ev = iwe_stream_add_point(info, current_ev,
769                                                           end_buf,
770                                                           &iwe, buf);
771                         sprintf(buf, "Path Selection Protocol ID: "
772                                 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
773                                                         cfg[4]);
774                         iwe.u.data.length = strlen(buf);
775                         current_ev = iwe_stream_add_point(info, current_ev,
776                                                           end_buf,
777                                                           &iwe, buf);
778                         sprintf(buf, "Path Selection Metric ID: "
779                                 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
780                                                         cfg[8]);
781                         iwe.u.data.length = strlen(buf);
782                         current_ev = iwe_stream_add_point(info, current_ev,
783                                                           end_buf,
784                                                           &iwe, buf);
785                         sprintf(buf, "Congestion Control Mode ID: "
786                                 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
787                                                         cfg[11], cfg[12]);
788                         iwe.u.data.length = strlen(buf);
789                         current_ev = iwe_stream_add_point(info, current_ev,
790                                                           end_buf,
791                                                           &iwe, buf);
792                         sprintf(buf, "Channel Precedence: "
793                                 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
794                                                         cfg[15], cfg[16]);
795                         iwe.u.data.length = strlen(buf);
796                         current_ev = iwe_stream_add_point(info, current_ev,
797                                                           end_buf,
798                                                           &iwe, buf);
799                         kfree(buf);
800                         break;
801                 case WLAN_EID_SUPP_RATES:
802                 case WLAN_EID_EXT_SUPP_RATES:
803                         /* display all supported rates in readable format */
804                         p = current_ev + iwe_stream_lcp_len(info);
805
806                         memset(&iwe, 0, sizeof(iwe));
807                         iwe.cmd = SIOCGIWRATE;
808                         /* Those two flags are ignored... */
809                         iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
810
811                         for (i = 0; i < ie[1]; i++) {
812                                 iwe.u.bitrate.value =
813                                         ((ie[i + 2] & 0x7f) * 500000);
814                                 p = iwe_stream_add_value(info, current_ev, p,
815                                                 end_buf, &iwe, IW_EV_PARAM_LEN);
816                         }
817                         current_ev = p;
818                         break;
819                 }
820                 rem -= ie[1] + 2;
821                 ie += ie[1] + 2;
822         }
823
824         if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
825             || ismesh) {
826                 memset(&iwe, 0, sizeof(iwe));
827                 iwe.cmd = SIOCGIWMODE;
828                 if (ismesh)
829                         iwe.u.mode = IW_MODE_MESH;
830                 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
831                         iwe.u.mode = IW_MODE_MASTER;
832                 else
833                         iwe.u.mode = IW_MODE_ADHOC;
834                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
835                                                   &iwe, IW_EV_UINT_LEN);
836         }
837
838         buf = kmalloc(30, GFP_ATOMIC);
839         if (buf) {
840                 memset(&iwe, 0, sizeof(iwe));
841                 iwe.cmd = IWEVCUSTOM;
842                 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
843                 iwe.u.data.length = strlen(buf);
844                 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
845                                                   &iwe, buf);
846                 memset(&iwe, 0, sizeof(iwe));
847                 iwe.cmd = IWEVCUSTOM;
848                 sprintf(buf, " Last beacon: %ums ago",
849                         elapsed_jiffies_msecs(bss->ts));
850                 iwe.u.data.length = strlen(buf);
851                 current_ev = iwe_stream_add_point(info, current_ev,
852                                                   end_buf, &iwe, buf);
853                 kfree(buf);
854         }
855
856         ieee80211_scan_add_ies(info, &bss->pub, &current_ev, end_buf);
857
858         return current_ev;
859 }
860
861
862 static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
863                                   struct iw_request_info *info,
864                                   char *buf, size_t len)
865 {
866         char *current_ev = buf;
867         char *end_buf = buf + len;
868         struct cfg80211_internal_bss *bss;
869
870         spin_lock_bh(&dev->bss_lock);
871         cfg80211_bss_expire(dev);
872
873         list_for_each_entry(bss, &dev->bss_list, list) {
874                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
875                         spin_unlock_bh(&dev->bss_lock);
876                         return -E2BIG;
877                 }
878                 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
879                                            current_ev, end_buf);
880         }
881         spin_unlock_bh(&dev->bss_lock);
882         return current_ev - buf;
883 }
884
885
886 int cfg80211_wext_giwscan(struct net_device *dev,
887                           struct iw_request_info *info,
888                           struct iw_point *data, char *extra)
889 {
890         struct cfg80211_registered_device *rdev;
891         int res;
892
893         if (!netif_running(dev))
894                 return -ENETDOWN;
895
896         rdev = cfg80211_get_dev_from_ifindex(dev->ifindex);
897
898         if (IS_ERR(rdev))
899                 return PTR_ERR(rdev);
900
901         if (rdev->scan_req) {
902                 res = -EAGAIN;
903                 goto out;
904         }
905
906         res = ieee80211_scan_results(rdev, info, extra, data->length);
907         data->length = 0;
908         if (res >= 0) {
909                 data->length = res;
910                 res = 0;
911         }
912
913  out:
914         cfg80211_put_dev(rdev);
915         return res;
916 }
917 EXPORT_SYMBOL(cfg80211_wext_giwscan);
918 #endif