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cfg80211: combine IWESSID handlers
[linux-2.6-block.git] / net / wireless / scan.c
CommitLineData
2a519311
JB		 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
09f97e0f 18#define IEEE80211_SCAN_RESULT_EXPIRE (15 * HZ)
2a519311 19
667503dd 20void __cfg80211_scan_done(struct work_struct *wk)
2a519311 21{
667503dd
JB		 22 struct cfg80211_registered_device *rdev;
23 struct cfg80211_scan_request *request;
2a519311
JB		 24 struct net_device *dev;
25#ifdef CONFIG_WIRELESS_EXT
26 union iwreq_data wrqu;
27#endif
28
667503dd
JB		 29 rdev = container_of(wk, struct cfg80211_registered_device,
30 scan_done_wk);
31
32 mutex_lock(&rdev->mtx);
33 request = rdev->scan_req;
34
463d0183 35 dev = request->dev;
2a519311 36
6829c878
JB		 37 /*
38 * This must be before sending the other events!
39 * Otherwise, wpa_supplicant gets completely confused with
40 * wext events.
41 */
42 cfg80211_sme_scan_done(dev);
43
667503dd 44 if (request->aborted)
2a519311
JB		 45 nl80211_send_scan_aborted(wiphy_to_dev(request->wiphy), dev);
46 else
47 nl80211_send_scan_done(wiphy_to_dev(request->wiphy), dev);
48
49#ifdef CONFIG_WIRELESS_EXT
667503dd 50 if (!request->aborted) {
2a519311
JB		 51 memset(&wrqu, 0, sizeof(wrqu));
52
53 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
54 }
55#endif
56
57 dev_put(dev);
58
667503dd 59 cfg80211_unlock_rdev(rdev);
9e81eccf 60 wiphy_to_dev(request->wiphy)->scan_req = NULL;
2a519311
JB		 61 kfree(request);
62}
667503dd
JB		 63
64void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
65{
667503dd
JB		 66 WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);
67
68 request->aborted = aborted;
69 schedule_work(&wiphy_to_dev(request->wiphy)->scan_done_wk);
667503dd 70}
2a519311
JB		 71EXPORT_SYMBOL(cfg80211_scan_done);
72
73static void bss_release(struct kref *ref)
74{
75 struct cfg80211_internal_bss *bss;
76
77 bss = container_of(ref, struct cfg80211_internal_bss, ref);
78c1c7e1
JB		 78 if (bss->pub.free_priv)
79 bss->pub.free_priv(&bss->pub);
cd1658f5
JB		 80
81 if (bss->ies_allocated)
82 kfree(bss->pub.information_elements);
83
19957bb3
JB		 84 BUG_ON(atomic_read(&bss->hold));
85
2a519311
JB		 86 kfree(bss);
87}
88
cb3a8eec
DW		 89/* must hold dev->bss_lock! */
90void cfg80211_bss_age(struct cfg80211_registered_device *dev,
91 unsigned long age_secs)
92{
93 struct cfg80211_internal_bss *bss;
94 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
95
96 list_for_each_entry(bss, &dev->bss_list, list) {
97 bss->ts -= age_jiffies;
98 }
99}
100
2a519311
JB		 101/* must hold dev->bss_lock! */
102void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
103{
104 struct cfg80211_internal_bss *bss, *tmp;
105 bool expired = false;
106
107 list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
19957bb3
JB		 108 if (atomic_read(&bss->hold))
109 continue;
110 if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE))
2a519311
JB		 111 continue;
112 list_del(&bss->list);
113 rb_erase(&bss->rbn, &dev->bss_tree);
114 kref_put(&bss->ref, bss_release);
115 expired = true;
116 }
117
118 if (expired)
119 dev->bss_generation++;
120}
121
122static u8 *find_ie(u8 num, u8 *ies, size_t len)
123{
124 while (len > 2 && ies[0] != num) {
125 len -= ies[1] + 2;
126 ies += ies[1] + 2;
127 }
128 if (len < 2)
129 return NULL;
130 if (len < 2 + ies[1])
131 return NULL;
132 return ies;
133}
134
135static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
136{
137 const u8 *ie1 = find_ie(num, ies1, len1);
138 const u8 *ie2 = find_ie(num, ies2, len2);
139 int r;
140
141 if (!ie1 && !ie2)
142 return 0;
143 if (!ie1)
144 return -1;
145
146 r = memcmp(ie1 + 2, ie2 + 2, min(ie1[1], ie2[1]));
147 if (r == 0 && ie1[1] != ie2[1])
148 return ie2[1] - ie1[1];
149 return r;
150}
151
152static bool is_bss(struct cfg80211_bss *a,
153 const u8 *bssid,
154 const u8 *ssid, size_t ssid_len)
155{
156 const u8 *ssidie;
157
79420f09 158 if (bssid && compare_ether_addr(a->bssid, bssid))
2a519311
JB		 159 return false;
160
79420f09
JB		 161 if (!ssid)
162 return true;
163
2a519311
JB		 164 ssidie = find_ie(WLAN_EID_SSID,
165 a->information_elements,
166 a->len_information_elements);
167 if (!ssidie)
168 return false;
169 if (ssidie[1] != ssid_len)
170 return false;
171 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
172}
173
174static bool is_mesh(struct cfg80211_bss *a,
175 const u8 *meshid, size_t meshidlen,
176 const u8 *meshcfg)
177{
178 const u8 *ie;
179
180 if (!is_zero_ether_addr(a->bssid))
181 return false;
182
183 ie = find_ie(WLAN_EID_MESH_ID,
184 a->information_elements,
185 a->len_information_elements);
186 if (!ie)
187 return false;
188 if (ie[1] != meshidlen)
189 return false;
190 if (memcmp(ie + 2, meshid, meshidlen))
191 return false;
192
193 ie = find_ie(WLAN_EID_MESH_CONFIG,
194 a->information_elements,
195 a->len_information_elements);
196 if (ie[1] != IEEE80211_MESH_CONFIG_LEN)
197 return false;
198
199 /*
200 * Ignore mesh capability (last two bytes of the IE) when
201 * comparing since that may differ between stations taking
202 * part in the same mesh.
203 */
204 return memcmp(ie + 2, meshcfg, IEEE80211_MESH_CONFIG_LEN - 2) == 0;
205}
206
207static int cmp_bss(struct cfg80211_bss *a,
208 struct cfg80211_bss *b)
209{
210 int r;
211
212 if (a->channel != b->channel)
213 return b->channel->center_freq - a->channel->center_freq;
214
215 r = memcmp(a->bssid, b->bssid, ETH_ALEN);
216 if (r)
217 return r;
218
219 if (is_zero_ether_addr(a->bssid)) {
220 r = cmp_ies(WLAN_EID_MESH_ID,
221 a->information_elements,
222 a->len_information_elements,
223 b->information_elements,
224 b->len_information_elements);
225 if (r)
226 return r;
227 return cmp_ies(WLAN_EID_MESH_CONFIG,
228 a->information_elements,
229 a->len_information_elements,
230 b->information_elements,
231 b->len_information_elements);
232 }
233
234 return cmp_ies(WLAN_EID_SSID,
235 a->information_elements,
236 a->len_information_elements,
237 b->information_elements,
238 b->len_information_elements);
239}
240
241struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
242 struct ieee80211_channel *channel,
243 const u8 *bssid,
79420f09
JB		 244 const u8 *ssid, size_t ssid_len,
245 u16 capa_mask, u16 capa_val)
2a519311
JB		 246{
247 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
248 struct cfg80211_internal_bss *bss, *res = NULL;
249
250 spin_lock_bh(&dev->bss_lock);
251
252 list_for_each_entry(bss, &dev->bss_list, list) {
79420f09
JB		 253 if ((bss->pub.capability & capa_mask) != capa_val)
254 continue;
2a519311
JB		 255 if (channel && bss->pub.channel != channel)
256 continue;
257 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
258 res = bss;
259 kref_get(&res->ref);
260 break;
261 }
262 }
263
264 spin_unlock_bh(&dev->bss_lock);
265 if (!res)
266 return NULL;
267 return &res->pub;
268}
269EXPORT_SYMBOL(cfg80211_get_bss);
270
271struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
272 struct ieee80211_channel *channel,
273 const u8 *meshid, size_t meshidlen,
274 const u8 *meshcfg)
275{
276 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
277 struct cfg80211_internal_bss *bss, *res = NULL;
278
279 spin_lock_bh(&dev->bss_lock);
280
281 list_for_each_entry(bss, &dev->bss_list, list) {
282 if (channel && bss->pub.channel != channel)
283 continue;
284 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
285 res = bss;
286 kref_get(&res->ref);
287 break;
288 }
289 }
290
291 spin_unlock_bh(&dev->bss_lock);
292 if (!res)
293 return NULL;
294 return &res->pub;
295}
296EXPORT_SYMBOL(cfg80211_get_mesh);
297
298
299static void rb_insert_bss(struct cfg80211_registered_device *dev,
300 struct cfg80211_internal_bss *bss)
301{
302 struct rb_node **p = &dev->bss_tree.rb_node;
303 struct rb_node *parent = NULL;
304 struct cfg80211_internal_bss *tbss;
305 int cmp;
306
307 while (*p) {
308 parent = *p;
309 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
310
311 cmp = cmp_bss(&bss->pub, &tbss->pub);
312
313 if (WARN_ON(!cmp)) {
314 /* will sort of leak this BSS */
315 return;
316 }
317
318 if (cmp < 0)
319 p = &(*p)->rb_left;
320 else
321 p = &(*p)->rb_right;
322 }
323
324 rb_link_node(&bss->rbn, parent, p);
325 rb_insert_color(&bss->rbn, &dev->bss_tree);
326}
327
328static struct cfg80211_internal_bss *
329rb_find_bss(struct cfg80211_registered_device *dev,
330 struct cfg80211_internal_bss *res)
331{
332 struct rb_node *n = dev->bss_tree.rb_node;
333 struct cfg80211_internal_bss *bss;
334 int r;
335
336 while (n) {
337 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
338 r = cmp_bss(&res->pub, &bss->pub);
339
340 if (r == 0)
341 return bss;
342 else if (r < 0)
343 n = n->rb_left;
344 else
345 n = n->rb_right;
346 }
347
348 return NULL;
349}
350
351static struct cfg80211_internal_bss *
352cfg80211_bss_update(struct cfg80211_registered_device *dev,
353 struct cfg80211_internal_bss *res,
354 bool overwrite)
355{
356 struct cfg80211_internal_bss *found = NULL;
357 const u8 *meshid, *meshcfg;
358
359 /*
360 * The reference to "res" is donated to this function.
361 */
362
363 if (WARN_ON(!res->pub.channel)) {
364 kref_put(&res->ref, bss_release);
365 return NULL;
366 }
367
368 res->ts = jiffies;
369
370 if (is_zero_ether_addr(res->pub.bssid)) {
371 /* must be mesh, verify */
372 meshid = find_ie(WLAN_EID_MESH_ID, res->pub.information_elements,
373 res->pub.len_information_elements);
374 meshcfg = find_ie(WLAN_EID_MESH_CONFIG,
375 res->pub.information_elements,
376 res->pub.len_information_elements);
377 if (!meshid || !meshcfg ||
378 meshcfg[1] != IEEE80211_MESH_CONFIG_LEN) {
379 /* bogus mesh */
380 kref_put(&res->ref, bss_release);
381 return NULL;
382 }
383 }
384
385 spin_lock_bh(&dev->bss_lock);
386
387 found = rb_find_bss(dev, res);
388
cd1658f5 389 if (found) {
2a519311
JB		 390 found->pub.beacon_interval = res->pub.beacon_interval;
391 found->pub.tsf = res->pub.tsf;
392 found->pub.signal = res->pub.signal;
2a519311
JB		 393 found->pub.capability = res->pub.capability;
394 found->ts = res->ts;
cd1658f5
JB		 395
396 /* overwrite IEs */
397 if (overwrite) {
398 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
399 size_t ielen = res->pub.len_information_elements;
400
44e1b98f 401 if (!found->ies_allocated && ksize(found) >= used + ielen) {
cd1658f5
JB		 402 memcpy(found->pub.information_elements,
403 res->pub.information_elements, ielen);
404 found->pub.len_information_elements = ielen;
405 } else {
406 u8 *ies = found->pub.information_elements;
407
273de92c
MB		 408 if (found->ies_allocated)
409 ies = krealloc(ies, ielen, GFP_ATOMIC);
410 else
cd1658f5
JB		 411 ies = kmalloc(ielen, GFP_ATOMIC);
412
413 if (ies) {
414 memcpy(ies, res->pub.information_elements, ielen);
415 found->ies_allocated = true;
416 found->pub.information_elements = ies;
c0f0aac0 417 found->pub.len_information_elements = ielen;
cd1658f5
JB		 418 }
419 }
420 }
421
2a519311
JB		 422 kref_put(&res->ref, bss_release);
423 } else {
424 /* this "consumes" the reference */
425 list_add_tail(&res->list, &dev->bss_list);
426 rb_insert_bss(dev, res);
427 found = res;
428 }
429
430 dev->bss_generation++;
431 spin_unlock_bh(&dev->bss_lock);
432
433 kref_get(&found->ref);
434 return found;
435}
436
06aa7afa
JK		 437struct cfg80211_bss*
438cfg80211_inform_bss(struct wiphy *wiphy,
439 struct ieee80211_channel *channel,
440 const u8 *bssid,
441 u64 timestamp, u16 capability, u16 beacon_interval,
442 const u8 *ie, size_t ielen,
443 s32 signal, gfp_t gfp)
444{
445 struct cfg80211_internal_bss *res;
446 size_t privsz;
447
448 if (WARN_ON(!wiphy))
449 return NULL;
450
451 privsz = wiphy->bss_priv_size;
452
453 if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC &&
454 (signal < 0 || signal > 100)))
455 return NULL;
456
457 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
458 if (!res)
459 return NULL;
460
461 memcpy(res->pub.bssid, bssid, ETH_ALEN);
462 res->pub.channel = channel;
463 res->pub.signal = signal;
464 res->pub.tsf = timestamp;
465 res->pub.beacon_interval = beacon_interval;
466 res->pub.capability = capability;
467 /* point to after the private area */
468 res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz;
469 memcpy(res->pub.information_elements, ie, ielen);
470 res->pub.len_information_elements = ielen;
471
472 kref_init(&res->ref);
473
474 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, 0);
475 if (!res)
476 return NULL;
477
478 if (res->pub.capability & WLAN_CAPABILITY_ESS)
479 regulatory_hint_found_beacon(wiphy, channel, gfp);
480
481 /* cfg80211_bss_update gives us a referenced result */
482 return &res->pub;
483}
484EXPORT_SYMBOL(cfg80211_inform_bss);
485
2a519311
JB		 486struct cfg80211_bss *
487cfg80211_inform_bss_frame(struct wiphy *wiphy,
488 struct ieee80211_channel *channel,
489 struct ieee80211_mgmt *mgmt, size_t len,
77965c97 490 s32 signal, gfp_t gfp)
2a519311
JB		 491{
492 struct cfg80211_internal_bss *res;
493 size_t ielen = len - offsetof(struct ieee80211_mgmt,
494 u.probe_resp.variable);
495 bool overwrite;
496 size_t privsz = wiphy->bss_priv_size;
497
77965c97 498 if (WARN_ON(wiphy->signal_type == NL80211_BSS_SIGNAL_UNSPEC &&
2a519311
JB		 499 (signal < 0 || signal > 100)))
500 return NULL;
501
502 if (WARN_ON(!mgmt || !wiphy ||
503 len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
504 return NULL;
505
506 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
507 if (!res)
508 return NULL;
509
510 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
511 res->pub.channel = channel;
2a519311
JB		 512 res->pub.signal = signal;
513 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
514 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
515 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
516 /* point to after the private area */
517 res->pub.information_elements = (u8 *)res + sizeof(*res) + privsz;
518 memcpy(res->pub.information_elements, mgmt->u.probe_resp.variable, ielen);
519 res->pub.len_information_elements = ielen;
520
521 kref_init(&res->ref);
522
523 overwrite = ieee80211_is_probe_resp(mgmt->frame_control);
524
525 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res, overwrite);
526 if (!res)
527 return NULL;
528
e38f8a7a
LR		 529 if (res->pub.capability & WLAN_CAPABILITY_ESS)
530 regulatory_hint_found_beacon(wiphy, channel, gfp);
531
2a519311
JB		 532 /* cfg80211_bss_update gives us a referenced result */
533 return &res->pub;
534}
535EXPORT_SYMBOL(cfg80211_inform_bss_frame);
536
537void cfg80211_put_bss(struct cfg80211_bss *pub)
538{
539 struct cfg80211_internal_bss *bss;
540
541 if (!pub)
542 return;
543
544 bss = container_of(pub, struct cfg80211_internal_bss, pub);
545 kref_put(&bss->ref, bss_release);
546}
547EXPORT_SYMBOL(cfg80211_put_bss);
548
d491af19
JB		 549void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
550{
551 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
552 struct cfg80211_internal_bss *bss;
553
554 if (WARN_ON(!pub))
555 return;
556
557 bss = container_of(pub, struct cfg80211_internal_bss, pub);
558
559 spin_lock_bh(&dev->bss_lock);
560
561 list_del(&bss->list);
562 rb_erase(&bss->rbn, &dev->bss_tree);
563
564 spin_unlock_bh(&dev->bss_lock);
565
566 kref_put(&bss->ref, bss_release);
567}
568EXPORT_SYMBOL(cfg80211_unlink_bss);
569
2a519311
JB		 570#ifdef CONFIG_WIRELESS_EXT
571int cfg80211_wext_siwscan(struct net_device *dev,
572 struct iw_request_info *info,
573 union iwreq_data *wrqu, char *extra)
574{
575 struct cfg80211_registered_device *rdev;
576 struct wiphy *wiphy;
577 struct iw_scan_req *wreq = NULL;
578 struct cfg80211_scan_request *creq;
579 int i, err, n_channels = 0;
580 enum ieee80211_band band;
581
582 if (!netif_running(dev))
583 return -ENETDOWN;
584
463d0183 585 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2a519311
JB		 586
587 if (IS_ERR(rdev))
588 return PTR_ERR(rdev);
589
590 if (rdev->scan_req) {
591 err = -EBUSY;
592 goto out;
593 }
594
595 wiphy = &rdev->wiphy;
596
597 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
598 if (wiphy->bands[band])
599 n_channels += wiphy->bands[band]->n_channels;
600
601 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
602 n_channels * sizeof(void *),
603 GFP_ATOMIC);
604 if (!creq) {
605 err = -ENOMEM;
606 goto out;
607 }
608
609 creq->wiphy = wiphy;
463d0183 610 creq->dev = dev;
2a519311
JB		 611 creq->ssids = (void *)(creq + 1);
612 creq->channels = (void *)(creq->ssids + 1);
613 creq->n_channels = n_channels;
614 creq->n_ssids = 1;
615
616 /* all channels */
617 i = 0;
618 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
619 int j;
620 if (!wiphy->bands[band])
621 continue;
622 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
623 creq->channels[i] = &wiphy->bands[band]->channels[j];
624 i++;
625 }
626 }
627
628 /* translate scan request */
629 if (wrqu->data.length == sizeof(struct iw_scan_req)) {
630 wreq = (struct iw_scan_req *)extra;
631
632 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
633 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN)
634 return -EINVAL;
635 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
636 creq->ssids[0].ssid_len = wreq->essid_len;
637 }
638 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
639 creq->n_ssids = 0;
640 }
641
642 rdev->scan_req = creq;
643 err = rdev->ops->scan(wiphy, dev, creq);
644 if (err) {
645 rdev->scan_req = NULL;
646 kfree(creq);
463d0183 647 } else {
a538e2d5 648 nl80211_send_scan_start(rdev, dev);
463d0183
JB		 649 dev_hold(dev);
650 }
2a519311 651 out:
4d0c8aea 652 cfg80211_unlock_rdev(rdev);
2a519311
JB		 653 return err;
654}
ba44cb72 655EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
2a519311
JB		 656
657static void ieee80211_scan_add_ies(struct iw_request_info *info,
658 struct cfg80211_bss *bss,
659 char **current_ev, char *end_buf)
660{
661 u8 *pos, *end, *next;
662 struct iw_event iwe;
663
664 if (!bss->information_elements ||
665 !bss->len_information_elements)
666 return;
667
668 /*
669 * If needed, fragment the IEs buffer (at IE boundaries) into short
670 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
671 */
672 pos = bss->information_elements;
673 end = pos + bss->len_information_elements;
674
675 while (end - pos > IW_GENERIC_IE_MAX) {
676 next = pos + 2 + pos[1];
677 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
678 next = next + 2 + next[1];
679
680 memset(&iwe, 0, sizeof(iwe));
681 iwe.cmd = IWEVGENIE;
682 iwe.u.data.length = next - pos;
683 *current_ev = iwe_stream_add_point(info, *current_ev,
684 end_buf, &iwe, pos);
685
686 pos = next;
687 }
688
689 if (end > pos) {
690 memset(&iwe, 0, sizeof(iwe));
691 iwe.cmd = IWEVGENIE;
692 iwe.u.data.length = end - pos;
693 *current_ev = iwe_stream_add_point(info, *current_ev,
694 end_buf, &iwe, pos);
695 }
696}
697
cb3a8eec
DW		 698static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
699{
700 unsigned long end = jiffies;
701
702 if (end >= start)
703 return jiffies_to_msecs(end - start);
704
705 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
706}
2a519311
JB		 707
708static char *
77965c97
JB		 709ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
710 struct cfg80211_internal_bss *bss, char *current_ev,
711 char *end_buf)
2a519311
JB		 712{
713 struct iw_event iwe;
714 u8 *buf, *cfg, *p;
715 u8 *ie = bss->pub.information_elements;
a77b8552 716 int rem = bss->pub.len_information_elements, i, sig;
2a519311
JB		 717 bool ismesh = false;
718
719 memset(&iwe, 0, sizeof(iwe));
720 iwe.cmd = SIOCGIWAP;
721 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
722 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
723 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
724 IW_EV_ADDR_LEN);
725
726 memset(&iwe, 0, sizeof(iwe));
727 iwe.cmd = SIOCGIWFREQ;
728 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
729 iwe.u.freq.e = 0;
730 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
731 IW_EV_FREQ_LEN);
732
733 memset(&iwe, 0, sizeof(iwe));
734 iwe.cmd = SIOCGIWFREQ;
735 iwe.u.freq.m = bss->pub.channel->center_freq;
736 iwe.u.freq.e = 6;
737 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
738 IW_EV_FREQ_LEN);
739
77965c97 740 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
2a519311
JB		 741 memset(&iwe, 0, sizeof(iwe));
742 iwe.cmd = IWEVQUAL;
743 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
744 IW_QUAL_NOISE_INVALID |
a77b8552 745 IW_QUAL_QUAL_UPDATED;
77965c97 746 switch (wiphy->signal_type) {
2a519311 747 case CFG80211_SIGNAL_TYPE_MBM:
a77b8552
JB		 748 sig = bss->pub.signal / 100;
749 iwe.u.qual.level = sig;
2a519311 750 iwe.u.qual.updated |= IW_QUAL_DBM;
a77b8552
JB		 751 if (sig < -110) /* rather bad */
752 sig = -110;
753 else if (sig > -40) /* perfect */
754 sig = -40;
755 /* will give a range of 0 .. 70 */
756 iwe.u.qual.qual = sig + 110;
2a519311
JB		 757 break;
758 case CFG80211_SIGNAL_TYPE_UNSPEC:
759 iwe.u.qual.level = bss->pub.signal;
a77b8552
JB		 760 /* will give range 0 .. 100 */
761 iwe.u.qual.qual = bss->pub.signal;
2a519311
JB		 762 break;
763 default:
764 /* not reached */
765 break;
766 }
767 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
768 &iwe, IW_EV_QUAL_LEN);
769 }
770
771 memset(&iwe, 0, sizeof(iwe));
772 iwe.cmd = SIOCGIWENCODE;
773 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
774 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
775 else
776 iwe.u.data.flags = IW_ENCODE_DISABLED;
777 iwe.u.data.length = 0;
778 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
779 &iwe, "");
780
781 while (rem >= 2) {
782 /* invalid data */
783 if (ie[1] > rem - 2)
784 break;
785
786 switch (ie[0]) {
787 case WLAN_EID_SSID:
788 memset(&iwe, 0, sizeof(iwe));
789 iwe.cmd = SIOCGIWESSID;
790 iwe.u.data.length = ie[1];
791 iwe.u.data.flags = 1;
792 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
793 &iwe, ie + 2);
794 break;
795 case WLAN_EID_MESH_ID:
796 memset(&iwe, 0, sizeof(iwe));
797 iwe.cmd = SIOCGIWESSID;
798 iwe.u.data.length = ie[1];
799 iwe.u.data.flags = 1;
800 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
801 &iwe, ie + 2);
802 break;
803 case WLAN_EID_MESH_CONFIG:
804 ismesh = true;
805 if (ie[1] != IEEE80211_MESH_CONFIG_LEN)
806 break;
807 buf = kmalloc(50, GFP_ATOMIC);
808 if (!buf)
809 break;
810 cfg = ie + 2;
811 memset(&iwe, 0, sizeof(iwe));
812 iwe.cmd = IWEVCUSTOM;
813 sprintf(buf, "Mesh network (version %d)", cfg[0]);
814 iwe.u.data.length = strlen(buf);
815 current_ev = iwe_stream_add_point(info, current_ev,
816 end_buf,
817 &iwe, buf);
818 sprintf(buf, "Path Selection Protocol ID: "
819 "0x%02X%02X%02X%02X", cfg[1], cfg[2], cfg[3],
820 cfg[4]);
821 iwe.u.data.length = strlen(buf);
822 current_ev = iwe_stream_add_point(info, current_ev,
823 end_buf,
824 &iwe, buf);
825 sprintf(buf, "Path Selection Metric ID: "
826 "0x%02X%02X%02X%02X", cfg[5], cfg[6], cfg[7],
827 cfg[8]);
828 iwe.u.data.length = strlen(buf);
829 current_ev = iwe_stream_add_point(info, current_ev,
830 end_buf,
831 &iwe, buf);
832 sprintf(buf, "Congestion Control Mode ID: "
833 "0x%02X%02X%02X%02X", cfg[9], cfg[10],
834 cfg[11], cfg[12]);
835 iwe.u.data.length = strlen(buf);
836 current_ev = iwe_stream_add_point(info, current_ev,
837 end_buf,
838 &iwe, buf);
839 sprintf(buf, "Channel Precedence: "
840 "0x%02X%02X%02X%02X", cfg[13], cfg[14],
841 cfg[15], cfg[16]);
842 iwe.u.data.length = strlen(buf);
843 current_ev = iwe_stream_add_point(info, current_ev,
844 end_buf,
845 &iwe, buf);
846 kfree(buf);
847 break;
848 case WLAN_EID_SUPP_RATES:
849 case WLAN_EID_EXT_SUPP_RATES:
850 /* display all supported rates in readable format */
851 p = current_ev + iwe_stream_lcp_len(info);
852
853 memset(&iwe, 0, sizeof(iwe));
854 iwe.cmd = SIOCGIWRATE;
855 /* Those two flags are ignored... */
856 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
857
858 for (i = 0; i < ie[1]; i++) {
859 iwe.u.bitrate.value =
860 ((ie[i + 2] & 0x7f) * 500000);
861 p = iwe_stream_add_value(info, current_ev, p,
862 end_buf, &iwe, IW_EV_PARAM_LEN);
863 }
864 current_ev = p;
865 break;
866 }
867 rem -= ie[1] + 2;
868 ie += ie[1] + 2;
869 }
870
871 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS)
872 || ismesh) {
873 memset(&iwe, 0, sizeof(iwe));
874 iwe.cmd = SIOCGIWMODE;
875 if (ismesh)
876 iwe.u.mode = IW_MODE_MESH;
877 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
878 iwe.u.mode = IW_MODE_MASTER;
879 else
880 iwe.u.mode = IW_MODE_ADHOC;
881 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
882 &iwe, IW_EV_UINT_LEN);
883 }
884
885 buf = kmalloc(30, GFP_ATOMIC);
886 if (buf) {
887 memset(&iwe, 0, sizeof(iwe));
888 iwe.cmd = IWEVCUSTOM;
889 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
890 iwe.u.data.length = strlen(buf);
891 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
892 &iwe, buf);
893 memset(&iwe, 0, sizeof(iwe));
894 iwe.cmd = IWEVCUSTOM;
cb3a8eec
DW		 895 sprintf(buf, " Last beacon: %ums ago",
896 elapsed_jiffies_msecs(bss->ts));
2a519311
JB		 897 iwe.u.data.length = strlen(buf);
898 current_ev = iwe_stream_add_point(info, current_ev,
899 end_buf, &iwe, buf);
900 kfree(buf);
901 }
902
903 ieee80211_scan_add_ies(info, &bss->pub, &current_ev, end_buf);
904
905 return current_ev;
906}
907
908
909static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
910 struct iw_request_info *info,
911 char *buf, size_t len)
912{
913 char *current_ev = buf;
914 char *end_buf = buf + len;
915 struct cfg80211_internal_bss *bss;
916
917 spin_lock_bh(&dev->bss_lock);
918 cfg80211_bss_expire(dev);
919
920 list_for_each_entry(bss, &dev->bss_list, list) {
921 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
922 spin_unlock_bh(&dev->bss_lock);
923 return -E2BIG;
924 }
77965c97
JB		 925 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
926 current_ev, end_buf);
2a519311
JB		 927 }
928 spin_unlock_bh(&dev->bss_lock);
929 return current_ev - buf;
930}
931
932
933int cfg80211_wext_giwscan(struct net_device *dev,
934 struct iw_request_info *info,
935 struct iw_point *data, char *extra)
936{
937 struct cfg80211_registered_device *rdev;
938 int res;
939
940 if (!netif_running(dev))
941 return -ENETDOWN;
942
463d0183 943 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2a519311
JB		 944
945 if (IS_ERR(rdev))
946 return PTR_ERR(rdev);
947
948 if (rdev->scan_req) {
949 res = -EAGAIN;
950 goto out;
951 }
952
953 res = ieee80211_scan_results(rdev, info, extra, data->length);
954 data->length = 0;
955 if (res >= 0) {
956 data->length = res;
957 res = 0;
958 }
959
960 out:
4d0c8aea 961 cfg80211_unlock_rdev(rdev);
2a519311
JB		 962 return res;
963}
ba44cb72 964EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);
2a519311 965#endif
Linux 6.x block layer and io_uring tree(s)