ixgbe: remove unnecessary call to device_init_wakeup
[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
33         if (aborted)
34                 nl80211_send_scan_aborted(wiphy_to_dev(request->wiphy), dev);
35         else
36                 nl80211_send_scan_done(wiphy_to_dev(request->wiphy), dev);
37
38 #ifdef CONFIG_WIRELESS_EXT
39         if (!aborted) {
40                 memset(&wrqu, 0, sizeof(wrqu));
41
42                 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
43         }
44 #endif
45
46         dev_put(dev);
47
48  out:
49         wiphy_to_dev(request->wiphy)->scan_req = NULL;
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                 found->pub.beacon_interval = res->pub.beacon_interval;
369                 found->pub.tsf = res->pub.tsf;
370                 found->pub.signal = res->pub.signal;
371                 found->pub.capability = res->pub.capability;
372                 found->ts = res->ts;
373
374                 /* overwrite IEs */
375                 if (overwrite) {
376                         size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
377                         size_t ielen = res->pub.len_information_elements;
378
379                         if (!found->ies_allocated && ksize(found) >= used + ielen) {
380                                 memcpy(found->pub.information_elements,
381                                        res->pub.information_elements, ielen);
382                                 found->pub.len_information_elements = ielen;
383                         } else {
384                                 u8 *ies = found->pub.information_elements;
385
386                                 if (found->ies_allocated)
387                                         ies = krealloc(ies, ielen, GFP_ATOMIC);
388                                 else
389                                         ies = kmalloc(ielen, GFP_ATOMIC);
390
391                                 if (ies) {
392                                         memcpy(ies, res->pub.information_elements, ielen);
393                                         found->ies_allocated = true;
394                                         found->pub.information_elements = ies;
395                                         found->pub.len_information_elements = ielen;
396                                 }
397                         }
398                 }
399
400                 kref_put(&res->ref, bss_release);
401         } else {
402                 /* this "consumes" the reference */
403                 list_add_tail(&res->list, &dev->bss_list);
404                 rb_insert_bss(dev, res);
405                 found = res;
406         }
407
408         dev->bss_generation++;
409         spin_unlock_bh(&dev->bss_lock);
410
411         kref_get(&found->ref);
412         return found;
413 }
414
415 struct cfg80211_bss*
416 cfg80211_inform_bss(struct wiphy *wiphy,
417                     struct ieee80211_channel *channel,
418                     const u8 *bssid,
419                     u64 timestamp, u16 capability, u16 beacon_interval,
420                     const u8 *ie, size_t ielen,
421                     s32 signal, gfp_t gfp)
422 {
423         struct cfg80211_internal_bss *res;
424         size_t privsz;
425
426         if (WARN_ON(!wiphy))
427                 return NULL;
428
429         privsz = wiphy->bss_priv_size;
430
431         if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC &&
432                         (signal < 0 || signal > 100)))
433                 return NULL;
434
435         res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
436         if (!res)
437                 return NULL;
438
439         memcpy(res->pub.bssid, bssid, ETH_ALEN);
440         res->pub.channel = channel;
441         res->pub.signal = signal;
442         res->pub.tsf = timestamp;
443         res->pub.beacon_interval = beacon_interval;
444         res->pub.capability = capability;
445         /* point to after the private area */
446         res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz;
447         memcpy(res->pub.information_elements, ie, ielen);
448         res->pub.len_information_elements = ielen;
449
450         kref_init(&res->ref);
451
452         res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, 0);
453         if (!res)
454                 return NULL;
455
456         if (res->pub.capability & WLAN_CAPABILITY_ESS)
457                 regulatory_hint_found_beacon(wiphy, channel, gfp);
458
459         /* cfg80211_bss_update gives us a referenced result */
460         return &res->pub;
461 }
462 EXPORT_SYMBOL(cfg80211_inform_bss);
463
464 struct cfg80211_bss *
465 cfg80211_inform_bss_frame(struct wiphy *wiphy,
466                           struct ieee80211_channel *channel,
467                           struct ieee80211_mgmt *mgmt, size_t len,
468                           s32 signal, gfp_t gfp)
469 {
470         struct cfg80211_internal_bss *res;
471         size_t ielen = len - offsetof(struct ieee80211_mgmt,
472                                       u.probe_resp.variable);
473         bool overwrite;
474         size_t privsz = wiphy->bss_priv_size;
475
476         if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC &&
477                     (signal < 0 || signal > 100)))
478                 return NULL;
479
480         if (WARN_ON(!mgmt || !wiphy ||
481                     len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
482                 return NULL;
483
484         res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
485         if (!res)
486                 return NULL;
487
488         memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
489         res->pub.channel = channel;
490         res->pub.signal = signal;
491         res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
492         res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
493         res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
494         /* point to after the private area */
495         res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz;
496         memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen);
497         res->pub.len_information_elements = ielen;
498
499         kref_init(&res->ref);
500
501         overwrite = ieee80211_is_probe_resp(mgmt->frame_control);
502
503         res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite);
504         if (!res)
505                 return NULL;
506
507         if (res->pub.capability & WLAN_CAPABILITY_ESS)
508                 regulatory_hint_found_beacon(wiphy, channel, gfp);
509
510         /* cfg80211_bss_update gives us a referenced result */
511         return &res->pub;
512 }
513 EXPORT_SYMBOL(cfg80211_inform_bss_frame);
514
515 void cfg80211_put_bss(struct cfg80211_bss *pub)
516 {
517         struct cfg80211_internal_bss *bss;
518
519         if (!pub)
520                 return;
521
522         bss = container_of(pub, struct cfg80211_internal_bss, pub);
523         kref_put(&bss->ref, bss_release);
524 }
525 EXPORT_SYMBOL(cfg80211_put_bss);
526
527 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
528 {
529         struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
530         struct cfg80211_internal_bss *bss;
531
532         if (WARN_ON(!pub))
533                 return;
534
535         bss = container_of(pub, struct cfg80211_internal_bss, pub);
536
537         spin_lock_bh(&dev->bss_lock);
538
539         list_del(&bss->list);
540         rb_erase(&bss->rbn, &dev->bss_tree);
541
542         spin_unlock_bh(&dev->bss_lock);
543
544         kref_put(&bss->ref, bss_release);
545 }
546 EXPORT_SYMBOL(cfg80211_unlink_bss);
547
548 void cfg80211_hold_bss(struct cfg80211_bss *pub)
549 {
550         struct cfg80211_internal_bss *bss;
551
552         if (!pub)
553                 return;
554
555         bss = container_of(pub, struct cfg80211_internal_bss, pub);
556         bss->hold = true;
557 }
558 EXPORT_SYMBOL(cfg80211_hold_bss);
559
560 void cfg80211_unhold_bss(struct cfg80211_bss *pub)
561 {
562         struct cfg80211_internal_bss *bss;
563
564         if (!pub)
565                 return;
566
567         bss = container_of(pub, struct cfg80211_internal_bss, pub);
568         bss->hold = false;
569 }
570 EXPORT_SYMBOL(cfg80211_unhold_bss);
571
572 #ifdef CONFIG_WIRELESS_EXT
573 int cfg80211_wext_siwscan(struct net_device *dev,
574                           struct iw_request_info *info,
575                           union iwreq_data *wrqu, char *extra)
576 {
577         struct cfg80211_registered_device *rdev;
578         struct wiphy *wiphy;
579         struct iw_scan_req *wreq = NULL;
580         struct cfg80211_scan_request *creq;
581         int i, err, n_channels = 0;
582         enum ieee80211_band band;
583
584         if (!netif_running(dev))
585                 return -ENETDOWN;
586
587         rdev = cfg80211_get_dev_from_ifindex(dev->ifindex);
588
589         if (IS_ERR(rdev))
590                 return PTR_ERR(rdev);
591
592         if (rdev->scan_req) {
593                 err = -EBUSY;
594                 goto out;
595         }
596
597         wiphy = &rdev->wiphy;
598
599         for (band = 0; band < IEEE80211_NUM_BANDS; band++)
600                 if (wiphy->bands[band])
601                         n_channels += wiphy->bands[band]->n_channels;
602
603         creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
604                        n_channels * sizeof(void *),
605                        GFP_ATOMIC);
606         if (!creq) {
607                 err = -ENOMEM;
608                 goto out;
609         }
610
611         creq->wiphy = wiphy;
612         creq->ifidx = dev->ifindex;
613         creq->ssids = (void *)(creq + 1);
614         creq->channels = (void *)(creq->ssids + 1);
615         creq->n_channels = n_channels;
616         creq->n_ssids = 1;
617
618         /* all channels */
619         i = 0;
620         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
621                 int j;
622                 if (!wiphy->bands[band])
623                         continue;
624                 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
625                         creq->channels[i] = &wiphy->bands[band]->channels[j];
626                         i++;
627                 }
628         }
629
630         /* translate scan request */
631         if (wrqu->data.length == sizeof(struct iw_scan_req)) {
632                 wreq = (struct iw_scan_req *)extra;
633
634                 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
635                         if (wreq->essid_len > IEEE80211_MAX_SSID_LEN)
636                                 return -EINVAL;
637                         memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
638                         creq->ssids[0].ssid_len = wreq->essid_len;
639                 }
640                 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
641                         creq->n_ssids = 0;
642         }
643
644         rdev->scan_req = creq;
645         err = rdev->ops->scan(wiphy, dev, creq);
646         if (err) {
647                 rdev->scan_req = NULL;
648                 kfree(creq);
649         }
650  out:
651         cfg80211_put_dev(rdev);
652         return err;
653 }
654 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
655
656 static void ieee80211_scan_add_ies(struct iw_request_info *info,
657                                    struct cfg80211_bss *bss,
658                                    char **current_ev, char *end_buf)
659 {
660         u8 *pos, *end, *next;
661         struct iw_event iwe;
662
663         if (!bss->information_elements ||
664             !bss->len_information_elements)
665                 return;
666
667         /*
668          * If needed, fragment the IEs buffer (at IE boundaries) into short
669          * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
670          */
671         pos = bss->information_elements;
672         end = pos + bss->len_information_elements;
673
674         while (end - pos > IW_GENERIC_IE_MAX) {
675                 next = pos + 2 + pos[1];
676                 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
677                         next = next + 2 + next[1];
678
679                 memset(&iwe, 0, sizeof(iwe));
680                 iwe.cmd = IWEVGENIE;
681                 iwe.u.data.length = next - pos;
682                 *current_ev = iwe_stream_add_point(info, *current_ev,
683                                                    end_buf, &iwe, pos);
684
685                 pos = next;
686         }
687
688         if (end > pos) {
689                 memset(&iwe, 0, sizeof(iwe));
690                 iwe.cmd = IWEVGENIE;
691                 iwe.u.data.length = end - pos;
692                 *current_ev = iwe_stream_add_point(info, *current_ev,
693                                                    end_buf, &iwe, pos);
694         }
695 }
696
697 static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
698 {
699         unsigned long end = jiffies;
700
701         if (end >= start)
702                 return jiffies_to_msecs(end - start);
703
704         return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
705 }
706
707 static char *
708 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
709               struct cfg80211_internal_bss *bss, char *current_ev,
710               char *end_buf)
711 {
712         struct iw_event iwe;
713         u8 *buf, *cfg, *p;
714         u8 *ie = bss->pub.information_elements;
715         int rem = bss->pub.len_information_elements, i, sig;
716         bool ismesh = false;
717
718         memset(&iwe, 0, sizeof(iwe));
719         iwe.cmd = SIOCGIWAP;
720         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
721         memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
722         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
723                                           IW_EV_ADDR_LEN);
724
725         memset(&iwe, 0, sizeof(iwe));
726         iwe.cmd = SIOCGIWFREQ;
727         iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
728         iwe.u.freq.e = 0;
729         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
730                                           IW_EV_FREQ_LEN);
731
732         memset(&iwe, 0, sizeof(iwe));
733         iwe.cmd = SIOCGIWFREQ;
734         iwe.u.freq.m = bss->pub.channel->center_freq;
735         iwe.u.freq.e = 6;
736         current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
737                                           IW_EV_FREQ_LEN);
738
739         if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
740                 memset(&iwe, 0, sizeof(iwe));
741                 iwe.cmd = IWEVQUAL;
742                 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
743                                      IW_QUAL_NOISE_INVALID |
744                                      IW_QUAL_QUAL_UPDATED;
745                 switch (wiphy->signal_type) {
746                 case CFG80211_SIGNAL_TYPE_MBM:
747                         sig = bss->pub.signal / 100;
748                         iwe.u.qual.level = sig;
749                         iwe.u.qual.updated |= IW_QUAL_DBM;
750                         if (sig < -110)         /* rather bad */
751                                 sig = -110;
752                         else if (sig > -40)     /* perfect */
753                                 sig = -40;
754                         /* will give a range of 0 .. 70 */
755                         iwe.u.qual.qual = sig + 110;
756                         break;
757                 case CFG80211_SIGNAL_TYPE_UNSPEC:
758                         iwe.u.qual.level = bss->pub.signal;
759                         /* will give range 0 .. 100 */
760                         iwe.u.qual.qual = bss->pub.signal;
761                         break;
762                 default:
763                         /* not reached */
764                         break;
765                 }
766                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
767                                                   &iwe, IW_EV_QUAL_LEN);
768         }
769
770         memset(&iwe, 0, sizeof(iwe));
771         iwe.cmd = SIOCGIWENCODE;
772         if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
773                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
774         else
775                 iwe.u.data.flags = IW_ENCODE_DISABLED;
776         iwe.u.data.length = 0;
777         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
778                                           &iwe, "");
779
780         while (rem >= 2) {
781                 /* invalid data */
782                 if (ie[1] > rem - 2)
783                         break;
784
785                 switch (ie[0]) {
786                 case WLAN_EID_SSID:
787                         memset(&iwe, 0, sizeof(iwe));
788                         iwe.cmd = SIOCGIWESSID;
789                         iwe.u.data.length = ie[1];
790                         iwe.u.data.flags = 1;
791                         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
792                                                           &iwe, ie + 2);
793                         break;
794                 case WLAN_EID_MESH_ID:
795                         memset(&iwe, 0, sizeof(iwe));
796                         iwe.cmd = SIOCGIWESSID;
797                         iwe.u.data.length = ie[1];
798                         iwe.u.data.flags = 1;
799                         current_ev = iwe_stream_add_point(info, current_ev, end_buf,
800                                                           &iwe, ie + 2);
801                         break;
802                 case WLAN_EID_MESH_CONFIG:
803                         ismesh = true;
804                         if (ie[1] != IEEE80211_MESH_CONFIG_LEN)
805                                 break;
806                         buf = kmalloc(50, GFP_ATOMIC);
807                         if (!buf)
808                                 break;
809                         cfg = ie + 2;
810                         memset(&iwe, 0, sizeof(iwe));
811                         iwe.cmd = IWEVCUSTOM;
812                         sprintf(buf, "Mesh network (version %d)", cfg[0]);
813                         iwe.u.data.length = strlen(buf);
814                         current_ev = iwe_stream_add_point(info, current_ev,
815                                                           end_buf,
816                                                           &iwe, buf);
817                         sprintf(buf, "Path Selection Protocol ID: "
818                                 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
819                                                         cfg[4]);
820                         iwe.u.data.length = strlen(buf);
821                         current_ev = iwe_stream_add_point(info, current_ev,
822                                                           end_buf,
823                                                           &iwe, buf);
824                         sprintf(buf, "Path Selection Metric ID: "
825                                 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
826                                                         cfg[8]);
827                         iwe.u.data.length = strlen(buf);
828                         current_ev = iwe_stream_add_point(info, current_ev,
829                                                           end_buf,
830                                                           &iwe, buf);
831                         sprintf(buf, "Congestion Control Mode ID: "
832                                 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
833                                                         cfg[11], cfg[12]);
834                         iwe.u.data.length = strlen(buf);
835                         current_ev = iwe_stream_add_point(info, current_ev,
836                                                           end_buf,
837                                                           &iwe, buf);
838                         sprintf(buf, "Channel Precedence: "
839                                 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
840                                                         cfg[15], cfg[16]);
841                         iwe.u.data.length = strlen(buf);
842                         current_ev = iwe_stream_add_point(info, current_ev,
843                                                           end_buf,
844                                                           &iwe, buf);
845                         kfree(buf);
846                         break;
847                 case WLAN_EID_SUPP_RATES:
848                 case WLAN_EID_EXT_SUPP_RATES:
849                         /* display all supported rates in readable format */
850                         p = current_ev + iwe_stream_lcp_len(info);
851
852                         memset(&iwe, 0, sizeof(iwe));
853                         iwe.cmd = SIOCGIWRATE;
854                         /* Those two flags are ignored... */
855                         iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
856
857                         for (i = 0; i < ie[1]; i++) {
858                                 iwe.u.bitrate.value =
859                                         ((ie[i + 2] & 0x7f) * 500000);
860                                 p = iwe_stream_add_value(info, current_ev, p,
861                                                 end_buf, &iwe, IW_EV_PARAM_LEN);
862                         }
863                         current_ev = p;
864                         break;
865                 }
866                 rem -= ie[1] + 2;
867                 ie += ie[1] + 2;
868         }
869
870         if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
871             || ismesh) {
872                 memset(&iwe, 0, sizeof(iwe));
873                 iwe.cmd = SIOCGIWMODE;
874                 if (ismesh)
875                         iwe.u.mode = IW_MODE_MESH;
876                 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
877                         iwe.u.mode = IW_MODE_MASTER;
878                 else
879                         iwe.u.mode = IW_MODE_ADHOC;
880                 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
881                                                   &iwe, IW_EV_UINT_LEN);
882         }
883
884         buf = kmalloc(30, GFP_ATOMIC);
885         if (buf) {
886                 memset(&iwe, 0, sizeof(iwe));
887                 iwe.cmd = IWEVCUSTOM;
888                 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
889                 iwe.u.data.length = strlen(buf);
890                 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
891                                                   &iwe, buf);
892                 memset(&iwe, 0, sizeof(iwe));
893                 iwe.cmd = IWEVCUSTOM;
894                 sprintf(buf, " Last beacon: %ums ago",
895                         elapsed_jiffies_msecs(bss->ts));
896                 iwe.u.data.length = strlen(buf);
897                 current_ev = iwe_stream_add_point(info, current_ev,
898                                                   end_buf, &iwe, buf);
899                 kfree(buf);
900         }
901
902         ieee80211_scan_add_ies(info, &bss->pub, &current_ev, end_buf);
903
904         return current_ev;
905 }
906
907
908 static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
909                                   struct iw_request_info *info,
910                                   char *buf, size_t len)
911 {
912         char *current_ev = buf;
913         char *end_buf = buf + len;
914         struct cfg80211_internal_bss *bss;
915
916         spin_lock_bh(&dev->bss_lock);
917         cfg80211_bss_expire(dev);
918
919         list_for_each_entry(bss, &dev->bss_list, list) {
920                 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
921                         spin_unlock_bh(&dev->bss_lock);
922                         return -E2BIG;
923                 }
924                 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
925                                            current_ev, end_buf);
926         }
927         spin_unlock_bh(&dev->bss_lock);
928         return current_ev - buf;
929 }
930
931
932 int cfg80211_wext_giwscan(struct net_device *dev,
933                           struct iw_request_info *info,
934                           struct iw_point *data, char *extra)
935 {
936         struct cfg80211_registered_device *rdev;
937         int res;
938
939         if (!netif_running(dev))
940                 return -ENETDOWN;
941
942         rdev = cfg80211_get_dev_from_ifindex(dev->ifindex);
943
944         if (IS_ERR(rdev))
945                 return PTR_ERR(rdev);
946
947         if (rdev->scan_req) {
948                 res = -EAGAIN;
949                 goto out;
950         }
951
952         res = ieee80211_scan_results(rdev, info, extra, data->length);
953         data->length = 0;
954         if (res >= 0) {
955                 data->length = res;
956                 res = 0;
957         }
958
959  out:
960         cfg80211_put_dev(rdev);
961         return res;
962 }
963 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);
964 #endif