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Johannes Berg2a519312009-02-10 21:25:55 +01001/*
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
20void 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}
52EXPORT_SYMBOL(cfg80211_scan_done);
53
54static void bss_release(struct kref *ref)
55{
56 struct cfg80211_internal_bss *bss;
57
58 bss = container_of(ref, struct cfg80211_internal_bss, ref);
Johannes Berg78c1c7e2009-02-10 21:25:57 +010059 if (bss->pub.free_priv)
60 bss->pub.free_priv(&bss->pub);
Johannes Bergcd1658f2009-04-16 15:00:58 +020061
62 if (bss->ies_allocated)
63 kfree(bss->pub.information_elements);
64
Johannes Berg2a519312009-02-10 21:25:55 +010065 kfree(bss);
66}
67
68/* must hold dev->bss_lock! */
Dan Williamscb3a8ee2009-02-11 17:14:43 -050069void 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! */
Johannes Berg2a519312009-02-10 21:25:55 +010081void 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) {
Kalle Valoa08c1c12009-03-22 21:57:28 +020087 if (bss->hold ||
88 !time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE))
Johannes Berg2a519312009-02-10 21:25:55 +010089 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
100static 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
113static 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
130static 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
Johannes Berg79420f02009-02-10 21:25:59 +0100136 if (bssid && compare_ether_addr(a->bssid, bssid))
Johannes Berg2a519312009-02-10 21:25:55 +0100137 return false;
138
Johannes Berg79420f02009-02-10 21:25:59 +0100139 if (!ssid)
140 return true;
141
Johannes Berg2a519312009-02-10 21:25:55 +0100142 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
152static 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
185static 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
219struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
220 struct ieee80211_channel *channel,
221 const u8 *bssid,
Johannes Berg79420f02009-02-10 21:25:59 +0100222 const u8 *ssid, size_t ssid_len,
223 u16 capa_mask, u16 capa_val)
Johannes Berg2a519312009-02-10 21:25:55 +0100224{
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) {
Johannes Berg79420f02009-02-10 21:25:59 +0100231 if ((bss->pub.capability & capa_mask) != capa_val)
232 continue;
Johannes Berg2a519312009-02-10 21:25:55 +0100233 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}
247EXPORT_SYMBOL(cfg80211_get_bss);
248
249struct 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}
274EXPORT_SYMBOL(cfg80211_get_mesh);
275
276
277static 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
306static struct cfg80211_internal_bss *
307rb_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
329static struct cfg80211_internal_bss *
330cfg80211_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
Johannes Bergcd1658f2009-04-16 15:00:58 +0200367 if (found) {
Johannes Berg2a519312009-02-10 21:25:55 +0100368 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;
Johannes Berg2a519312009-02-10 21:25:55 +0100372 found->pub.capability = res->pub.capability;
373 found->ts = res->ts;
Johannes Bergcd1658f2009-04-16 15:00:58 +0200374
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;
Johannes Bergc0f0aac2009-04-30 20:09:56 +0200398 found->pub.len_information_elements = ielen;
Johannes Bergcd1658f2009-04-16 15:00:58 +0200399 }
400 }
401 }
402
Johannes Berg2a519312009-02-10 21:25:55 +0100403 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
418struct cfg80211_bss *
419cfg80211_inform_bss_frame(struct wiphy *wiphy,
420 struct ieee80211_channel *channel,
421 struct ieee80211_mgmt *mgmt, size_t len,
Johannes Berg77965c92009-02-18 18:45:06 +0100422 s32 signal, gfp_t gfp)
Johannes Berg2a519312009-02-10 21:25:55 +0100423{
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
Johannes Berg77965c92009-02-18 18:45:06 +0100430 if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC &&
Johannes Berg2a519312009-02-10 21:25:55 +0100431 (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;
Johannes Berg2a519312009-02-10 21:25:55 +0100444 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
Luis R. Rodrigueze38f8a72009-02-21 00:20:39 -0500461 if (res->pub.capability & WLAN_CAPABILITY_ESS)
462 regulatory_hint_found_beacon(wiphy, channel, gfp);
463
Johannes Berg2a519312009-02-10 21:25:55 +0100464 /* cfg80211_bss_update gives us a referenced result */
465 return &res->pub;
466}
467EXPORT_SYMBOL(cfg80211_inform_bss_frame);
468
469void 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}
479EXPORT_SYMBOL(cfg80211_put_bss);
480
Johannes Bergd491af12009-02-10 21:25:58 +0100481void 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}
500EXPORT_SYMBOL(cfg80211_unlink_bss);
501
Kalle Valoa08c1c12009-03-22 21:57:28 +0200502void 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}
512EXPORT_SYMBOL(cfg80211_hold_bss);
513
514void 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}
524EXPORT_SYMBOL(cfg80211_unhold_bss);
525
Johannes Berg2a519312009-02-10 21:25:55 +0100526#ifdef CONFIG_WIRELESS_EXT
527int 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}
608EXPORT_SYMBOL(cfg80211_wext_siwscan);
609
610static 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
Dan Williamscb3a8ee2009-02-11 17:14:43 -0500651static 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}
Johannes Berg2a519312009-02-10 21:25:55 +0100660
661static char *
Johannes Berg77965c92009-02-18 18:45:06 +0100662ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
663 struct cfg80211_internal_bss *bss, char *current_ev,
664 char *end_buf)
Johannes Berg2a519312009-02-10 21:25:55 +0100665{
666 struct iw_event iwe;
667 u8 *buf, *cfg, *p;
668 u8 *ie = bss->pub.information_elements;
Johannes Berga77b8552009-02-18 18:27:22 +0100669 int rem = bss->pub.len_information_elements, i, sig;
Johannes Berg2a519312009-02-10 21:25:55 +0100670 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
Johannes Berg77965c92009-02-18 18:45:06 +0100693 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
Johannes Berg2a519312009-02-10 21:25:55 +0100694 memset(&iwe, 0, sizeof(iwe));
695 iwe.cmd = IWEVQUAL;
696 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
697 IW_QUAL_NOISE_INVALID |
Johannes Berga77b8552009-02-18 18:27:22 +0100698 IW_QUAL_QUAL_UPDATED;
Johannes Berg77965c92009-02-18 18:45:06 +0100699 switch (wiphy->signal_type) {
Johannes Berg2a519312009-02-10 21:25:55 +0100700 case CFG80211_SIGNAL_TYPE_MBM:
Johannes Berga77b8552009-02-18 18:27:22 +0100701 sig = bss->pub.signal / 100;
702 iwe.u.qual.level = sig;
Johannes Berg2a519312009-02-10 21:25:55 +0100703 iwe.u.qual.updated |= IW_QUAL_DBM;
Johannes Berga77b8552009-02-18 18:27:22 +0100704 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;
Johannes Berg2a519312009-02-10 21:25:55 +0100710 break;
711 case CFG80211_SIGNAL_TYPE_UNSPEC:
712 iwe.u.qual.level = bss->pub.signal;
Johannes Berga77b8552009-02-18 18:27:22 +0100713 /* will give range 0 .. 100 */
714 iwe.u.qual.qual = bss->pub.signal;
Johannes Berg2a519312009-02-10 21:25:55 +0100715 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;
Dan Williamscb3a8ee2009-02-11 17:14:43 -0500848 sprintf(buf, " Last beacon: %ums ago",
849 elapsed_jiffies_msecs(bss->ts));
Johannes Berg2a519312009-02-10 21:25:55 +0100850 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
862static 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 }
Johannes Berg77965c92009-02-18 18:45:06 +0100878 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
879 current_ev, end_buf);
Johannes Berg2a519312009-02-10 21:25:55 +0100880 }
881 spin_unlock_bh(&dev->bss_lock);
882 return current_ev - buf;
883}
884
885
886int 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}
917EXPORT_SYMBOL(cfg80211_wext_giwscan);
918#endif