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mm: page allocator: do not call direct reclaim for THP allocations while compaction...
[linux-2.6.git] / net / wireless / scan.c
blob31119e32e092b6e2615a8653c768a5cd7531465b
1 /*
2 * cfg80211 scan result handling
3 *
4 * Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
5 */
6 #include <linux/kernel.h>
7 #include <linux/slab.h>
8 #include <linux/module.h>
9 #include <linux/netdevice.h>
10 #include <linux/wireless.h>
11 #include <linux/nl80211.h>
12 #include <linux/etherdevice.h>
13 #include <net/arp.h>
14 #include <net/cfg80211.h>
15 #include <net/cfg80211-wext.h>
16 #include <net/iw_handler.h>
17 #include "core.h"
18 #include "nl80211.h"
19 #include "wext-compat.h"
20
21 #define IEEE80211_SCAN_RESULT_EXPIRE (15 * HZ)
22
23 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev, bool leak)
24 {
25 struct cfg80211_scan_request *request;
26 struct net_device *dev;
27 #ifdef CONFIG_CFG80211_WEXT
28 union iwreq_data wrqu;
29 #endif
30
31 ASSERT_RDEV_LOCK(rdev);
32
33 request = rdev->scan_req;
34
35 if (!request)
36 return;
37
38 dev = request->dev;
39
40 /*
41 * This must be before sending the other events!
42 * Otherwise, wpa_supplicant gets completely confused with
43 * wext events.
44 */
45 cfg80211_sme_scan_done(dev);
46
47 if (request->aborted)
48 nl80211_send_scan_aborted(rdev, dev);
49 else
50 nl80211_send_scan_done(rdev, dev);
51
52 #ifdef CONFIG_CFG80211_WEXT
53 if (!request->aborted) {
54 memset(&wrqu, 0, sizeof(wrqu));
55
56 wireless_send_event(dev, SIOCGIWSCAN, &wrqu, NULL);
57 }
58 #endif
59
60 dev_put(dev);
61
62 rdev->scan_req = NULL;
63
64 /*
65 * OK. If this is invoked with "leak" then we can't
66 * free this ... but we've cleaned it up anyway. The
67 * driver failed to call the scan_done callback, so
68 * all bets are off, it might still be trying to use
69 * the scan request or not ... if it accesses the dev
70 * in there (it shouldn't anyway) then it may crash.
71 */
72 if (!leak)
73 kfree(request);
74 }
75
76 void __cfg80211_scan_done(struct work_struct *wk)
77 {
78 struct cfg80211_registered_device *rdev;
79
80 rdev = container_of(wk, struct cfg80211_registered_device,
81 scan_done_wk);
82
83 cfg80211_lock_rdev(rdev);
84 ___cfg80211_scan_done(rdev, false);
85 cfg80211_unlock_rdev(rdev);
86 }
87
88 void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
89 {
90 WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);
91
92 request->aborted = aborted;
93 queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk);
94 }
95 EXPORT_SYMBOL(cfg80211_scan_done);
96
97 void __cfg80211_sched_scan_results(struct work_struct *wk)
98 {
99 struct cfg80211_registered_device *rdev;
100
101 rdev = container_of(wk, struct cfg80211_registered_device,
102 sched_scan_results_wk);
103
104 mutex_lock(&rdev->sched_scan_mtx);
105
106 /* we don't have sched_scan_req anymore if the scan is stopping */
107 if (rdev->sched_scan_req)
108 nl80211_send_sched_scan_results(rdev,
109 rdev->sched_scan_req->dev);
110
111 mutex_unlock(&rdev->sched_scan_mtx);
112 }
113
114 void cfg80211_sched_scan_results(struct wiphy *wiphy)
115 {
116 /* ignore if we're not scanning */
117 if (wiphy_to_dev(wiphy)->sched_scan_req)
118 queue_work(cfg80211_wq,
119 &wiphy_to_dev(wiphy)->sched_scan_results_wk);
120 }
121 EXPORT_SYMBOL(cfg80211_sched_scan_results);
122
123 void cfg80211_sched_scan_stopped(struct wiphy *wiphy)
124 {
125 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
126
127 mutex_lock(&rdev->sched_scan_mtx);
128 __cfg80211_stop_sched_scan(rdev, true);
129 mutex_unlock(&rdev->sched_scan_mtx);
130 }
131 EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
132
133 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
134 bool driver_initiated)
135 {
136 struct net_device *dev;
137
138 lockdep_assert_held(&rdev->sched_scan_mtx);
139
140 if (!rdev->sched_scan_req)
141 return -ENOENT;
142
143 dev = rdev->sched_scan_req->dev;
144
145 if (!driver_initiated) {
146 int err = rdev->ops->sched_scan_stop(&rdev->wiphy, dev);
147 if (err)
148 return err;
149 }
150
151 nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED);
152
153 kfree(rdev->sched_scan_req);
154 rdev->sched_scan_req = NULL;
155
156 return 0;
157 }
158
159 static void bss_release(struct kref *ref)
160 {
161 struct cfg80211_internal_bss *bss;
162
163 bss = container_of(ref, struct cfg80211_internal_bss, ref);
164 if (bss->pub.free_priv)
165 bss->pub.free_priv(&bss->pub);
166
167 if (bss->beacon_ies_allocated)
168 kfree(bss->pub.beacon_ies);
169 if (bss->proberesp_ies_allocated)
170 kfree(bss->pub.proberesp_ies);
171
172 BUG_ON(atomic_read(&bss->hold));
173
174 kfree(bss);
175 }
176
177 /* must hold dev->bss_lock! */
178 void cfg80211_bss_age(struct cfg80211_registered_device *dev,
179 unsigned long age_secs)
180 {
181 struct cfg80211_internal_bss *bss;
182 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
183
184 list_for_each_entry(bss, &dev->bss_list, list) {
185 bss->ts -= age_jiffies;
186 }
187 }
188
189 /* must hold dev->bss_lock! */
190 static void __cfg80211_unlink_bss(struct cfg80211_registered_device *dev,
191 struct cfg80211_internal_bss *bss)
192 {
193 list_del_init(&bss->list);
194 rb_erase(&bss->rbn, &dev->bss_tree);
195 kref_put(&bss->ref, bss_release);
196 }
197
198 /* must hold dev->bss_lock! */
199 void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
200 {
201 struct cfg80211_internal_bss *bss, *tmp;
202 bool expired = false;
203
204 list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
205 if (atomic_read(&bss->hold))
206 continue;
207 if (!time_after(jiffies, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE))
208 continue;
209 __cfg80211_unlink_bss(dev, bss);
210 expired = true;
211 }
212
213 if (expired)
214 dev->bss_generation++;
215 }
216
217 const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len)
218 {
219 while (len > 2 && ies[0] != eid) {
220 len -= ies[1] + 2;
221 ies += ies[1] + 2;
222 }
223 if (len < 2)
224 return NULL;
225 if (len < 2 + ies[1])
226 return NULL;
227 return ies;
228 }
229 EXPORT_SYMBOL(cfg80211_find_ie);
230
231 const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type,
232 const u8 *ies, int len)
233 {
234 struct ieee80211_vendor_ie *ie;
235 const u8 *pos = ies, *end = ies + len;
236 int ie_oui;
237
238 while (pos < end) {
239 pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos,
240 end - pos);
241 if (!pos)
242 return NULL;
243
244 if (end - pos < sizeof(*ie))
245 return NULL;
246
247 ie = (struct ieee80211_vendor_ie *)pos;
248 ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2];
249 if (ie_oui == oui && ie->oui_type == oui_type)
250 return pos;
251
252 pos += 2 + ie->len;
253 }
254 return NULL;
255 }
256 EXPORT_SYMBOL(cfg80211_find_vendor_ie);
257
258 static int cmp_ies(u8 num, u8 *ies1, size_t len1, u8 *ies2, size_t len2)
259 {
260 const u8 *ie1 = cfg80211_find_ie(num, ies1, len1);
261 const u8 *ie2 = cfg80211_find_ie(num, ies2, len2);
262
263 /* equal if both missing */
264 if (!ie1 && !ie2)
265 return 0;
266 /* sort missing IE before (left of) present IE */
267 if (!ie1)
268 return -1;
269 if (!ie2)
270 return 1;
271
272 /* sort by length first, then by contents */
273 if (ie1[1] != ie2[1])
274 return ie2[1] - ie1[1];
275 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
276 }
277
278 static bool is_bss(struct cfg80211_bss *a,
279 const u8 *bssid,
280 const u8 *ssid, size_t ssid_len)
281 {
282 const u8 *ssidie;
283
284 if (bssid && compare_ether_addr(a->bssid, bssid))
285 return false;
286
287 if (!ssid)
288 return true;
289
290 ssidie = cfg80211_find_ie(WLAN_EID_SSID,
291 a->information_elements,
292 a->len_information_elements);
293 if (!ssidie)
294 return false;
295 if (ssidie[1] != ssid_len)
296 return false;
297 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
298 }
299
300 static bool is_mesh_bss(struct cfg80211_bss *a)
301 {
302 const u8 *ie;
303
304 if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
305 return false;
306
307 ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
308 a->information_elements,
309 a->len_information_elements);
310 if (!ie)
311 return false;
312
313 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
314 a->information_elements,
315 a->len_information_elements);
316 if (!ie)
317 return false;
318
319 return true;
320 }
321
322 static bool is_mesh(struct cfg80211_bss *a,
323 const u8 *meshid, size_t meshidlen,
324 const u8 *meshcfg)
325 {
326 const u8 *ie;
327
328 if (!WLAN_CAPABILITY_IS_STA_BSS(a->capability))
329 return false;
330
331 ie = cfg80211_find_ie(WLAN_EID_MESH_ID,
332 a->information_elements,
333 a->len_information_elements);
334 if (!ie)
335 return false;
336 if (ie[1] != meshidlen)
337 return false;
338 if (memcmp(ie + 2, meshid, meshidlen))
339 return false;
340
341 ie = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
342 a->information_elements,
343 a->len_information_elements);
344 if (!ie)
345 return false;
346 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
347 return false;
348
349 /*
350 * Ignore mesh capability (last two bytes of the IE) when
351 * comparing since that may differ between stations taking
352 * part in the same mesh.
353 */
354 return memcmp(ie + 2, meshcfg,
355 sizeof(struct ieee80211_meshconf_ie) - 2) == 0;
356 }
357
358 static int cmp_bss_core(struct cfg80211_bss *a,
359 struct cfg80211_bss *b)
360 {
361 int r;
362
363 if (a->channel != b->channel)
364 return b->channel->center_freq - a->channel->center_freq;
365
366 if (is_mesh_bss(a) && is_mesh_bss(b)) {
367 r = cmp_ies(WLAN_EID_MESH_ID,
368 a->information_elements,
369 a->len_information_elements,
370 b->information_elements,
371 b->len_information_elements);
372 if (r)
373 return r;
374 return cmp_ies(WLAN_EID_MESH_CONFIG,
375 a->information_elements,
376 a->len_information_elements,
377 b->information_elements,
378 b->len_information_elements);
379 }
380
381 return memcmp(a->bssid, b->bssid, ETH_ALEN);
382 }
383
384 static int cmp_bss(struct cfg80211_bss *a,
385 struct cfg80211_bss *b)
386 {
387 int r;
388
389 r = cmp_bss_core(a, b);
390 if (r)
391 return r;
392
393 return cmp_ies(WLAN_EID_SSID,
394 a->information_elements,
395 a->len_information_elements,
396 b->information_elements,
397 b->len_information_elements);
398 }
399
400 static int cmp_hidden_bss(struct cfg80211_bss *a,
401 struct cfg80211_bss *b)
402 {
403 const u8 *ie1;
404 const u8 *ie2;
405 int i;
406 int r;
407
408 r = cmp_bss_core(a, b);
409 if (r)
410 return r;
411
412 ie1 = cfg80211_find_ie(WLAN_EID_SSID,
413 a->information_elements,
414 a->len_information_elements);
415 ie2 = cfg80211_find_ie(WLAN_EID_SSID,
416 b->information_elements,
417 b->len_information_elements);
418
419 /* Key comparator must use same algorithm in any rb-tree
420 * search function (order is important), otherwise ordering
421 * of items in the tree is broken and search gives incorrect
422 * results. This code uses same order as cmp_ies() does. */
423
424 /* sort missing IE before (left of) present IE */
425 if (!ie1)
426 return -1;
427 if (!ie2)
428 return 1;
429
430 /* zero-size SSID is used as an indication of the hidden bss */
431 if (!ie2[1])
432 return 0;
433
434 /* sort by length first, then by contents */
435 if (ie1[1] != ie2[1])
436 return ie2[1] - ie1[1];
437
438 /* zeroed SSID ie is another indication of a hidden bss */
439 for (i = 0; i < ie2[1]; i++)
440 if (ie2[i + 2])
441 return -1;
442
443 return 0;
444 }
445
446 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
447 struct ieee80211_channel *channel,
448 const u8 *bssid,
449 const u8 *ssid, size_t ssid_len,
450 u16 capa_mask, u16 capa_val)
451 {
452 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
453 struct cfg80211_internal_bss *bss, *res = NULL;
454 unsigned long now = jiffies;
455
456 spin_lock_bh(&dev->bss_lock);
457
458 list_for_each_entry(bss, &dev->bss_list, list) {
459 if ((bss->pub.capability & capa_mask) != capa_val)
460 continue;
461 if (channel && bss->pub.channel != channel)
462 continue;
463 /* Don't get expired BSS structs */
464 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
465 !atomic_read(&bss->hold))
466 continue;
467 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
468 res = bss;
469 kref_get(&res->ref);
470 break;
471 }
472 }
473
474 spin_unlock_bh(&dev->bss_lock);
475 if (!res)
476 return NULL;
477 return &res->pub;
478 }
479 EXPORT_SYMBOL(cfg80211_get_bss);
480
481 struct cfg80211_bss *cfg80211_get_mesh(struct wiphy *wiphy,
482 struct ieee80211_channel *channel,
483 const u8 *meshid, size_t meshidlen,
484 const u8 *meshcfg)
485 {
486 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
487 struct cfg80211_internal_bss *bss, *res = NULL;
488
489 spin_lock_bh(&dev->bss_lock);
490
491 list_for_each_entry(bss, &dev->bss_list, list) {
492 if (channel && bss->pub.channel != channel)
493 continue;
494 if (is_mesh(&bss->pub, meshid, meshidlen, meshcfg)) {
495 res = bss;
496 kref_get(&res->ref);
497 break;
498 }
499 }
500
501 spin_unlock_bh(&dev->bss_lock);
502 if (!res)
503 return NULL;
504 return &res->pub;
505 }
506 EXPORT_SYMBOL(cfg80211_get_mesh);
507
508
509 static void rb_insert_bss(struct cfg80211_registered_device *dev,
510 struct cfg80211_internal_bss *bss)
511 {
512 struct rb_node **p = &dev->bss_tree.rb_node;
513 struct rb_node *parent = NULL;
514 struct cfg80211_internal_bss *tbss;
515 int cmp;
516
517 while (*p) {
518 parent = *p;
519 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
520
521 cmp = cmp_bss(&bss->pub, &tbss->pub);
522
523 if (WARN_ON(!cmp)) {
524 /* will sort of leak this BSS */
525 return;
526 }
527
528 if (cmp < 0)
529 p = &(*p)->rb_left;
530 else
531 p = &(*p)->rb_right;
532 }
533
534 rb_link_node(&bss->rbn, parent, p);
535 rb_insert_color(&bss->rbn, &dev->bss_tree);
536 }
537
538 static struct cfg80211_internal_bss *
539 rb_find_bss(struct cfg80211_registered_device *dev,
540 struct cfg80211_internal_bss *res)
541 {
542 struct rb_node *n = dev->bss_tree.rb_node;
543 struct cfg80211_internal_bss *bss;
544 int r;
545
546 while (n) {
547 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
548 r = cmp_bss(&res->pub, &bss->pub);
549
550 if (r == 0)
551 return bss;
552 else if (r < 0)
553 n = n->rb_left;
554 else
555 n = n->rb_right;
556 }
557
558 return NULL;
559 }
560
561 static struct cfg80211_internal_bss *
562 rb_find_hidden_bss(struct cfg80211_registered_device *dev,
563 struct cfg80211_internal_bss *res)
564 {
565 struct rb_node *n = dev->bss_tree.rb_node;
566 struct cfg80211_internal_bss *bss;
567 int r;
568
569 while (n) {
570 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
571 r = cmp_hidden_bss(&res->pub, &bss->pub);
572
573 if (r == 0)
574 return bss;
575 else if (r < 0)
576 n = n->rb_left;
577 else
578 n = n->rb_right;
579 }
580
581 return NULL;
582 }
583
584 static void
585 copy_hidden_ies(struct cfg80211_internal_bss *res,
586 struct cfg80211_internal_bss *hidden)
587 {
588 if (unlikely(res->pub.beacon_ies))
589 return;
590 if (WARN_ON(!hidden->pub.beacon_ies))
591 return;
592
593 res->pub.beacon_ies = kmalloc(hidden->pub.len_beacon_ies, GFP_ATOMIC);
594 if (unlikely(!res->pub.beacon_ies))
595 return;
596
597 res->beacon_ies_allocated = true;
598 res->pub.len_beacon_ies = hidden->pub.len_beacon_ies;
599 memcpy(res->pub.beacon_ies, hidden->pub.beacon_ies,
600 res->pub.len_beacon_ies);
601 }
602
603 static struct cfg80211_internal_bss *
604 cfg80211_bss_update(struct cfg80211_registered_device *dev,
605 struct cfg80211_internal_bss *res)
606 {
607 struct cfg80211_internal_bss *found = NULL;
608
609 /*
610 * The reference to "res" is donated to this function.
611 */
612
613 if (WARN_ON(!res->pub.channel)) {
614 kref_put(&res->ref, bss_release);
615 return NULL;
616 }
617
618 res->ts = jiffies;
619
620 spin_lock_bh(&dev->bss_lock);
621
622 found = rb_find_bss(dev, res);
623
624 if (found) {
625 found->pub.beacon_interval = res->pub.beacon_interval;
626 found->pub.tsf = res->pub.tsf;
627 found->pub.signal = res->pub.signal;
628 found->pub.capability = res->pub.capability;
629 found->ts = res->ts;
630
631 /* Update IEs */
632 if (res->pub.proberesp_ies) {
633 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
634 size_t ielen = res->pub.len_proberesp_ies;
635
636 if (found->pub.proberesp_ies &&
637 !found->proberesp_ies_allocated &&
638 ksize(found) >= used + ielen) {
639 memcpy(found->pub.proberesp_ies,
640 res->pub.proberesp_ies, ielen);
641 found->pub.len_proberesp_ies = ielen;
642 } else {
643 u8 *ies = found->pub.proberesp_ies;
644
645 if (found->proberesp_ies_allocated)
646 ies = krealloc(ies, ielen, GFP_ATOMIC);
647 else
648 ies = kmalloc(ielen, GFP_ATOMIC);
649
650 if (ies) {
651 memcpy(ies, res->pub.proberesp_ies,
652 ielen);
653 found->proberesp_ies_allocated = true;
654 found->pub.proberesp_ies = ies;
655 found->pub.len_proberesp_ies = ielen;
656 }
657 }
658
659 /* Override possible earlier Beacon frame IEs */
660 found->pub.information_elements =
661 found->pub.proberesp_ies;
662 found->pub.len_information_elements =
663 found->pub.len_proberesp_ies;
664 }
665 if (res->pub.beacon_ies) {
666 size_t used = dev->wiphy.bss_priv_size + sizeof(*res);
667 size_t ielen = res->pub.len_beacon_ies;
668 bool information_elements_is_beacon_ies =
669 (found->pub.information_elements ==
670 found->pub.beacon_ies);
671
672 if (found->pub.beacon_ies &&
673 !found->beacon_ies_allocated &&
674 ksize(found) >= used + ielen) {
675 memcpy(found->pub.beacon_ies,
676 res->pub.beacon_ies, ielen);
677 found->pub.len_beacon_ies = ielen;
678 } else {
679 u8 *ies = found->pub.beacon_ies;
680
681 if (found->beacon_ies_allocated)
682 ies = krealloc(ies, ielen, GFP_ATOMIC);
683 else
684 ies = kmalloc(ielen, GFP_ATOMIC);
685
686 if (ies) {
687 memcpy(ies, res->pub.beacon_ies,
688 ielen);
689 found->beacon_ies_allocated = true;
690 found->pub.beacon_ies = ies;
691 found->pub.len_beacon_ies = ielen;
692 }
693 }
694
695 /* Override IEs if they were from a beacon before */
696 if (information_elements_is_beacon_ies) {
697 found->pub.information_elements =
698 found->pub.beacon_ies;
699 found->pub.len_information_elements =
700 found->pub.len_beacon_ies;
701 }
702 }
703
704 kref_put(&res->ref, bss_release);
705 } else {
706 struct cfg80211_internal_bss *hidden;
707
708 /* First check if the beacon is a probe response from
709 * a hidden bss. If so, copy beacon ies (with nullified
710 * ssid) into the probe response bss entry (with real ssid).
711 * It is required basically for PSM implementation
712 * (probe responses do not contain tim ie) */
713
714 /* TODO: The code is not trying to update existing probe
715 * response bss entries when beacon ies are
716 * getting changed. */
717 hidden = rb_find_hidden_bss(dev, res);
718 if (hidden)
719 copy_hidden_ies(res, hidden);
720
721 /* this "consumes" the reference */
722 list_add_tail(&res->list, &dev->bss_list);
723 rb_insert_bss(dev, res);
724 found = res;
725 }
726
727 dev->bss_generation++;
728 spin_unlock_bh(&dev->bss_lock);
729
730 kref_get(&found->ref);
731 return found;
732 }
733
734 struct cfg80211_bss*
735 cfg80211_inform_bss(struct wiphy *wiphy,
736 struct ieee80211_channel *channel,
737 const u8 *bssid,
738 u64 timestamp, u16 capability, u16 beacon_interval,
739 const u8 *ie, size_t ielen,
740 s32 signal, gfp_t gfp)
741 {
742 struct cfg80211_internal_bss *res;
743 size_t privsz;
744
745 if (WARN_ON(!wiphy))
746 return NULL;
747
748 privsz = wiphy->bss_priv_size;
749
750 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
751 (signal < 0 || signal > 100)))
752 return NULL;
753
754 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
755 if (!res)
756 return NULL;
757
758 memcpy(res->pub.bssid, bssid, ETH_ALEN);
759 res->pub.channel = channel;
760 res->pub.signal = signal;
761 res->pub.tsf = timestamp;
762 res->pub.beacon_interval = beacon_interval;
763 res->pub.capability = capability;
764 /*
765 * Since we do not know here whether the IEs are from a Beacon or Probe
766 * Response frame, we need to pick one of the options and only use it
767 * with the driver that does not provide the full Beacon/Probe Response
768 * frame. Use Beacon frame pointer to avoid indicating that this should
769 * override the information_elements pointer should we have received an
770 * earlier indication of Probe Response data.
771 *
772 * The initial buffer for the IEs is allocated with the BSS entry and
773 * is located after the private area.
774 */
775 res->pub.beacon_ies = (u8 *)res + sizeof(*res) + privsz;
776 memcpy(res->pub.beacon_ies, ie, ielen);
777 res->pub.len_beacon_ies = ielen;
778 res->pub.information_elements = res->pub.beacon_ies;
779 res->pub.len_information_elements = res->pub.len_beacon_ies;
780
781 kref_init(&res->ref);
782
783 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
784 if (!res)
785 return NULL;
786
787 if (res->pub.capability & WLAN_CAPABILITY_ESS)
788 regulatory_hint_found_beacon(wiphy, channel, gfp);
789
790 /* cfg80211_bss_update gives us a referenced result */
791 return &res->pub;
792 }
793 EXPORT_SYMBOL(cfg80211_inform_bss);
794
795 struct cfg80211_bss *
796 cfg80211_inform_bss_frame(struct wiphy *wiphy,
797 struct ieee80211_channel *channel,
798 struct ieee80211_mgmt *mgmt, size_t len,
799 s32 signal, gfp_t gfp)
800 {
801 struct cfg80211_internal_bss *res;
802 size_t ielen = len - offsetof(struct ieee80211_mgmt,
803 u.probe_resp.variable);
804 size_t privsz;
805
806 if (WARN_ON(!mgmt))
807 return NULL;
808
809 if (WARN_ON(!wiphy))
810 return NULL;
811
812 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
813 (signal < 0 || signal > 100)))
814 return NULL;
815
816 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
817 return NULL;
818
819 privsz = wiphy->bss_priv_size;
820
821 res = kzalloc(sizeof(*res) + privsz + ielen, gfp);
822 if (!res)
823 return NULL;
824
825 memcpy(res->pub.bssid, mgmt->bssid, ETH_ALEN);
826 res->pub.channel = channel;
827 res->pub.signal = signal;
828 res->pub.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
829 res->pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
830 res->pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
831 /*
832 * The initial buffer for the IEs is allocated with the BSS entry and
833 * is located after the private area.
834 */
835 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
836 res->pub.proberesp_ies = (u8 *) res + sizeof(*res) + privsz;
837 memcpy(res->pub.proberesp_ies, mgmt->u.probe_resp.variable,
838 ielen);
839 res->pub.len_proberesp_ies = ielen;
840 res->pub.information_elements = res->pub.proberesp_ies;
841 res->pub.len_information_elements = res->pub.len_proberesp_ies;
842 } else {
843 res->pub.beacon_ies = (u8 *) res + sizeof(*res) + privsz;
844 memcpy(res->pub.beacon_ies, mgmt->u.beacon.variable, ielen);
845 res->pub.len_beacon_ies = ielen;
846 res->pub.information_elements = res->pub.beacon_ies;
847 res->pub.len_information_elements = res->pub.len_beacon_ies;
848 }
849
850 kref_init(&res->ref);
851
852 res = cfg80211_bss_update(wiphy_to_dev(wiphy), res);
853 if (!res)
854 return NULL;
855
856 if (res->pub.capability & WLAN_CAPABILITY_ESS)
857 regulatory_hint_found_beacon(wiphy, channel, gfp);
858
859 /* cfg80211_bss_update gives us a referenced result */
860 return &res->pub;
861 }
862 EXPORT_SYMBOL(cfg80211_inform_bss_frame);
863
864 void cfg80211_put_bss(struct cfg80211_bss *pub)
865 {
866 struct cfg80211_internal_bss *bss;
867
868 if (!pub)
869 return;
870
871 bss = container_of(pub, struct cfg80211_internal_bss, pub);
872 kref_put(&bss->ref, bss_release);
873 }
874 EXPORT_SYMBOL(cfg80211_put_bss);
875
876 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
877 {
878 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
879 struct cfg80211_internal_bss *bss;
880
881 if (WARN_ON(!pub))
882 return;
883
884 bss = container_of(pub, struct cfg80211_internal_bss, pub);
885
886 spin_lock_bh(&dev->bss_lock);
887 if (!list_empty(&bss->list)) {
888 __cfg80211_unlink_bss(dev, bss);
889 dev->bss_generation++;
890 }
891 spin_unlock_bh(&dev->bss_lock);
892 }
893 EXPORT_SYMBOL(cfg80211_unlink_bss);
894
895 #ifdef CONFIG_CFG80211_WEXT
896 int cfg80211_wext_siwscan(struct net_device *dev,
897 struct iw_request_info *info,
898 union iwreq_data *wrqu, char *extra)
899 {
900 struct cfg80211_registered_device *rdev;
901 struct wiphy *wiphy;
902 struct iw_scan_req *wreq = NULL;
903 struct cfg80211_scan_request *creq = NULL;
904 int i, err, n_channels = 0;
905 enum ieee80211_band band;
906
907 if (!netif_running(dev))
908 return -ENETDOWN;
909
910 if (wrqu->data.length == sizeof(struct iw_scan_req))
911 wreq = (struct iw_scan_req *)extra;
912
913 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
914
915 if (IS_ERR(rdev))
916 return PTR_ERR(rdev);
917
918 if (rdev->scan_req) {
919 err = -EBUSY;
920 goto out;
921 }
922
923 wiphy = &rdev->wiphy;
924
925 /* Determine number of channels, needed to allocate creq */
926 if (wreq && wreq->num_channels)
927 n_channels = wreq->num_channels;
928 else {
929 for (band = 0; band < IEEE80211_NUM_BANDS; band++)
930 if (wiphy->bands[band])
931 n_channels += wiphy->bands[band]->n_channels;
932 }
933
934 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
935 n_channels * sizeof(void *),
936 GFP_ATOMIC);
937 if (!creq) {
938 err = -ENOMEM;
939 goto out;
940 }
941
942 creq->wiphy = wiphy;
943 creq->dev = dev;
944 /* SSIDs come after channels */
945 creq->ssids = (void *)&creq->channels[n_channels];
946 creq->n_channels = n_channels;
947 creq->n_ssids = 1;
948
949 /* translate "Scan on frequencies" request */
950 i = 0;
951 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
952 int j;
953
954 if (!wiphy->bands[band])
955 continue;
956
957 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
958 /* ignore disabled channels */
959 if (wiphy->bands[band]->channels[j].flags &
960 IEEE80211_CHAN_DISABLED)
961 continue;
962
963 /* If we have a wireless request structure and the
964 * wireless request specifies frequencies, then search
965 * for the matching hardware channel.
966 */
967 if (wreq && wreq->num_channels) {
968 int k;
969 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
970 for (k = 0; k < wreq->num_channels; k++) {
971 int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]);
972 if (wext_freq == wiphy_freq)
973 goto wext_freq_found;
974 }
975 goto wext_freq_not_found;
976 }
977
978 wext_freq_found:
979 creq->channels[i] = &wiphy->bands[band]->channels[j];
980 i++;
981 wext_freq_not_found: ;
982 }
983 }
984 /* No channels found? */
985 if (!i) {
986 err = -EINVAL;
987 goto out;
988 }
989
990 /* Set real number of channels specified in creq->channels[] */
991 creq->n_channels = i;
992
993 /* translate "Scan for SSID" request */
994 if (wreq) {
995 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
996 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
997 err = -EINVAL;
998 goto out;
999 }
1000 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
1001 creq->ssids[0].ssid_len = wreq->essid_len;
1002 }
1003 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
1004 creq->n_ssids = 0;
1005 }
1006
1007 for (i = 0; i < IEEE80211_NUM_BANDS; i++)
1008 if (wiphy->bands[i])
1009 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
1010
1011 rdev->scan_req = creq;
1012 err = rdev->ops->scan(wiphy, dev, creq);
1013 if (err) {
1014 rdev->scan_req = NULL;
1015 /* creq will be freed below */
1016 } else {
1017 nl80211_send_scan_start(rdev, dev);
1018 /* creq now owned by driver */
1019 creq = NULL;
1020 dev_hold(dev);
1021 }
1022 out:
1023 kfree(creq);
1024 cfg80211_unlock_rdev(rdev);
1025 return err;
1026 }
1027 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
1028
1029 static void ieee80211_scan_add_ies(struct iw_request_info *info,
1030 struct cfg80211_bss *bss,
1031 char **current_ev, char *end_buf)
1032 {
1033 u8 *pos, *end, *next;
1034 struct iw_event iwe;
1035
1036 if (!bss->information_elements ||
1037 !bss->len_information_elements)
1038 return;
1039
1040 /*
1041 * If needed, fragment the IEs buffer (at IE boundaries) into short
1042 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
1043 */
1044 pos = bss->information_elements;
1045 end = pos + bss->len_information_elements;
1046
1047 while (end - pos > IW_GENERIC_IE_MAX) {
1048 next = pos + 2 + pos[1];
1049 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
1050 next = next + 2 + next[1];
1051
1052 memset(&iwe, 0, sizeof(iwe));
1053 iwe.cmd = IWEVGENIE;
1054 iwe.u.data.length = next - pos;
1055 *current_ev = iwe_stream_add_point(info, *current_ev,
1056 end_buf, &iwe, pos);
1057
1058 pos = next;
1059 }
1060
1061 if (end > pos) {
1062 memset(&iwe, 0, sizeof(iwe));
1063 iwe.cmd = IWEVGENIE;
1064 iwe.u.data.length = end - pos;
1065 *current_ev = iwe_stream_add_point(info, *current_ev,
1066 end_buf, &iwe, pos);
1067 }
1068 }
1069
1070 static inline unsigned int elapsed_jiffies_msecs(unsigned long start)
1071 {
1072 unsigned long end = jiffies;
1073
1074 if (end >= start)
1075 return jiffies_to_msecs(end - start);
1076
1077 return jiffies_to_msecs(end + (MAX_JIFFY_OFFSET - start) + 1);
1078 }
1079
1080 static char *
1081 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
1082 struct cfg80211_internal_bss *bss, char *current_ev,
1083 char *end_buf)
1084 {
1085 struct iw_event iwe;
1086 u8 *buf, *cfg, *p;
1087 u8 *ie = bss->pub.information_elements;
1088 int rem = bss->pub.len_information_elements, i, sig;
1089 bool ismesh = false;
1090
1091 memset(&iwe, 0, sizeof(iwe));
1092 iwe.cmd = SIOCGIWAP;
1093 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1094 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
1095 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1096 IW_EV_ADDR_LEN);
1097
1098 memset(&iwe, 0, sizeof(iwe));
1099 iwe.cmd = SIOCGIWFREQ;
1100 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
1101 iwe.u.freq.e = 0;
1102 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1103 IW_EV_FREQ_LEN);
1104
1105 memset(&iwe, 0, sizeof(iwe));
1106 iwe.cmd = SIOCGIWFREQ;
1107 iwe.u.freq.m = bss->pub.channel->center_freq;
1108 iwe.u.freq.e = 6;
1109 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1110 IW_EV_FREQ_LEN);
1111
1112 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
1113 memset(&iwe, 0, sizeof(iwe));
1114 iwe.cmd = IWEVQUAL;
1115 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
1116 IW_QUAL_NOISE_INVALID |
1117 IW_QUAL_QUAL_UPDATED;
1118 switch (wiphy->signal_type) {
1119 case CFG80211_SIGNAL_TYPE_MBM:
1120 sig = bss->pub.signal / 100;
1121 iwe.u.qual.level = sig;
1122 iwe.u.qual.updated |= IW_QUAL_DBM;
1123 if (sig < -110) /* rather bad */
1124 sig = -110;
1125 else if (sig > -40) /* perfect */
1126 sig = -40;
1127 /* will give a range of 0 .. 70 */
1128 iwe.u.qual.qual = sig + 110;
1129 break;
1130 case CFG80211_SIGNAL_TYPE_UNSPEC:
1131 iwe.u.qual.level = bss->pub.signal;
1132 /* will give range 0 .. 100 */
1133 iwe.u.qual.qual = bss->pub.signal;
1134 break;
1135 default:
1136 /* not reached */
1137 break;
1138 }
1139 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1140 &iwe, IW_EV_QUAL_LEN);
1141 }
1142
1143 memset(&iwe, 0, sizeof(iwe));
1144 iwe.cmd = SIOCGIWENCODE;
1145 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
1146 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1147 else
1148 iwe.u.data.flags = IW_ENCODE_DISABLED;
1149 iwe.u.data.length = 0;
1150 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1151 &iwe, "");
1152
1153 while (rem >= 2) {
1154 /* invalid data */
1155 if (ie[1] > rem - 2)
1156 break;
1157
1158 switch (ie[0]) {
1159 case WLAN_EID_SSID:
1160 memset(&iwe, 0, sizeof(iwe));
1161 iwe.cmd = SIOCGIWESSID;
1162 iwe.u.data.length = ie[1];
1163 iwe.u.data.flags = 1;
1164 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1165 &iwe, ie + 2);
1166 break;
1167 case WLAN_EID_MESH_ID:
1168 memset(&iwe, 0, sizeof(iwe));
1169 iwe.cmd = SIOCGIWESSID;
1170 iwe.u.data.length = ie[1];
1171 iwe.u.data.flags = 1;
1172 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1173 &iwe, ie + 2);
1174 break;
1175 case WLAN_EID_MESH_CONFIG:
1176 ismesh = true;
1177 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
1178 break;
1179 buf = kmalloc(50, GFP_ATOMIC);
1180 if (!buf)
1181 break;
1182 cfg = ie + 2;
1183 memset(&iwe, 0, sizeof(iwe));
1184 iwe.cmd = IWEVCUSTOM;
1185 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
1186 "0x%02X", cfg[0]);
1187 iwe.u.data.length = strlen(buf);
1188 current_ev = iwe_stream_add_point(info, current_ev,
1189 end_buf,
1190 &iwe, buf);
1191 sprintf(buf, "Path Selection Metric ID: 0x%02X",
1192 cfg[1]);
1193 iwe.u.data.length = strlen(buf);
1194 current_ev = iwe_stream_add_point(info, current_ev,
1195 end_buf,
1196 &iwe, buf);
1197 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
1198 cfg[2]);
1199 iwe.u.data.length = strlen(buf);
1200 current_ev = iwe_stream_add_point(info, current_ev,
1201 end_buf,
1202 &iwe, buf);
1203 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
1204 iwe.u.data.length = strlen(buf);
1205 current_ev = iwe_stream_add_point(info, current_ev,
1206 end_buf,
1207 &iwe, buf);
1208 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
1209 iwe.u.data.length = strlen(buf);
1210 current_ev = iwe_stream_add_point(info, current_ev,
1211 end_buf,
1212 &iwe, buf);
1213 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
1214 iwe.u.data.length = strlen(buf);
1215 current_ev = iwe_stream_add_point(info, current_ev,
1216 end_buf,
1217 &iwe, buf);
1218 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
1219 iwe.u.data.length = strlen(buf);
1220 current_ev = iwe_stream_add_point(info, current_ev,
1221 end_buf,
1222 &iwe, buf);
1223 kfree(buf);
1224 break;
1225 case WLAN_EID_SUPP_RATES:
1226 case WLAN_EID_EXT_SUPP_RATES:
1227 /* display all supported rates in readable format */
1228 p = current_ev + iwe_stream_lcp_len(info);
1229
1230 memset(&iwe, 0, sizeof(iwe));
1231 iwe.cmd = SIOCGIWRATE;
1232 /* Those two flags are ignored... */
1233 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
1234
1235 for (i = 0; i < ie[1]; i++) {
1236 iwe.u.bitrate.value =
1237 ((ie[i + 2] & 0x7f) * 500000);
1238 p = iwe_stream_add_value(info, current_ev, p,
1239 end_buf, &iwe, IW_EV_PARAM_LEN);
1240 }
1241 current_ev = p;
1242 break;
1243 }
1244 rem -= ie[1] + 2;
1245 ie += ie[1] + 2;
1246 }
1247
1248 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
1249 ismesh) {
1250 memset(&iwe, 0, sizeof(iwe));
1251 iwe.cmd = SIOCGIWMODE;
1252 if (ismesh)
1253 iwe.u.mode = IW_MODE_MESH;
1254 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
1255 iwe.u.mode = IW_MODE_MASTER;
1256 else
1257 iwe.u.mode = IW_MODE_ADHOC;
1258 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1259 &iwe, IW_EV_UINT_LEN);
1260 }
1261
1262 buf = kmalloc(30, GFP_ATOMIC);
1263 if (buf) {
1264 memset(&iwe, 0, sizeof(iwe));
1265 iwe.cmd = IWEVCUSTOM;
1266 sprintf(buf, "tsf=%016llx", (unsigned long long)(bss->pub.tsf));
1267 iwe.u.data.length = strlen(buf);
1268 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1269 &iwe, buf);
1270 memset(&iwe, 0, sizeof(iwe));
1271 iwe.cmd = IWEVCUSTOM;
1272 sprintf(buf, " Last beacon: %ums ago",
1273 elapsed_jiffies_msecs(bss->ts));
1274 iwe.u.data.length = strlen(buf);
1275 current_ev = iwe_stream_add_point(info, current_ev,
1276 end_buf, &iwe, buf);
1277 kfree(buf);
1278 }
1279
1280 ieee80211_scan_add_ies(info, &bss->pub, &current_ev, end_buf);
1281
1282 return current_ev;
1283 }
1284
1285
1286 static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
1287 struct iw_request_info *info,
1288 char *buf, size_t len)
1289 {
1290 char *current_ev = buf;
1291 char *end_buf = buf + len;
1292 struct cfg80211_internal_bss *bss;
1293
1294 spin_lock_bh(&dev->bss_lock);
1295 cfg80211_bss_expire(dev);
1296
1297 list_for_each_entry(bss, &dev->bss_list, list) {
1298 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
1299 spin_unlock_bh(&dev->bss_lock);
1300 return -E2BIG;
1301 }
1302 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
1303 current_ev, end_buf);
1304 }
1305 spin_unlock_bh(&dev->bss_lock);
1306 return current_ev - buf;
1307 }
1308
1309
1310 int cfg80211_wext_giwscan(struct net_device *dev,
1311 struct iw_request_info *info,
1312 struct iw_point *data, char *extra)
1313 {
1314 struct cfg80211_registered_device *rdev;
1315 int res;
1316
1317 if (!netif_running(dev))
1318 return -ENETDOWN;
1319
1320 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1321
1322 if (IS_ERR(rdev))
1323 return PTR_ERR(rdev);
1324
1325 if (rdev->scan_req) {
1326 res = -EAGAIN;
1327 goto out;
1328 }
1329
1330 res = ieee80211_scan_results(rdev, info, extra, data->length);
1331 data->length = 0;
1332 if (res >= 0) {
1333 data->length = res;
1334 res = 0;
1335 }
1336
1337 out:
1338 cfg80211_unlock_rdev(rdev);
1339 return res;
1340 }
1341 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);
1342 #endif
Linus' kernel tree