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ARM: at91: remove atmel_tsadcc platform_data
[deliverable/linux.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/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 #include "rdev-ops.h"
21
22 /**
23 * DOC: BSS tree/list structure
24 *
25 * At the top level, the BSS list is kept in both a list in each
26 * registered device (@bss_list) as well as an RB-tree for faster
27 * lookup. In the RB-tree, entries can be looked up using their
28 * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID
29 * for other BSSes.
30 *
31 * Due to the possibility of hidden SSIDs, there's a second level
32 * structure, the "hidden_list" and "hidden_beacon_bss" pointer.
33 * The hidden_list connects all BSSes belonging to a single AP
34 * that has a hidden SSID, and connects beacon and probe response
35 * entries. For a probe response entry for a hidden SSID, the
36 * hidden_beacon_bss pointer points to the BSS struct holding the
37 * beacon's information.
38 *
39 * Reference counting is done for all these references except for
40 * the hidden_list, so that a beacon BSS struct that is otherwise
41 * not referenced has one reference for being on the bss_list and
42 * one for each probe response entry that points to it using the
43 * hidden_beacon_bss pointer. When a BSS struct that has such a
44 * pointer is get/put, the refcount update is also propagated to
45 * the referenced struct, this ensure that it cannot get removed
46 * while somebody is using the probe response version.
47 *
48 * Note that the hidden_beacon_bss pointer never changes, due to
49 * the reference counting. Therefore, no locking is needed for
50 * it.
51 *
52 * Also note that the hidden_beacon_bss pointer is only relevant
53 * if the driver uses something other than the IEs, e.g. private
54 * data stored stored in the BSS struct, since the beacon IEs are
55 * also linked into the probe response struct.
56 */
57
58 #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ)
59
60 static void bss_free(struct cfg80211_internal_bss *bss)
61 {
62 struct cfg80211_bss_ies *ies;
63
64 if (WARN_ON(atomic_read(&bss->hold)))
65 return;
66
67 ies = (void *)rcu_access_pointer(bss->pub.beacon_ies);
68 if (ies && !bss->pub.hidden_beacon_bss)
69 kfree_rcu(ies, rcu_head);
70 ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies);
71 if (ies)
72 kfree_rcu(ies, rcu_head);
73
74 /*
75 * This happens when the module is removed, it doesn't
76 * really matter any more save for completeness
77 */
78 if (!list_empty(&bss->hidden_list))
79 list_del(&bss->hidden_list);
80
81 kfree(bss);
82 }
83
84 static inline void bss_ref_get(struct cfg80211_registered_device *dev,
85 struct cfg80211_internal_bss *bss)
86 {
87 lockdep_assert_held(&dev->bss_lock);
88
89 bss->refcount++;
90 if (bss->pub.hidden_beacon_bss) {
91 bss = container_of(bss->pub.hidden_beacon_bss,
92 struct cfg80211_internal_bss,
93 pub);
94 bss->refcount++;
95 }
96 }
97
98 static inline void bss_ref_put(struct cfg80211_registered_device *dev,
99 struct cfg80211_internal_bss *bss)
100 {
101 lockdep_assert_held(&dev->bss_lock);
102
103 if (bss->pub.hidden_beacon_bss) {
104 struct cfg80211_internal_bss *hbss;
105 hbss = container_of(bss->pub.hidden_beacon_bss,
106 struct cfg80211_internal_bss,
107 pub);
108 hbss->refcount--;
109 if (hbss->refcount == 0)
110 bss_free(hbss);
111 }
112 bss->refcount--;
113 if (bss->refcount == 0)
114 bss_free(bss);
115 }
116
117 static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *dev,
118 struct cfg80211_internal_bss *bss)
119 {
120 lockdep_assert_held(&dev->bss_lock);
121
122 if (!list_empty(&bss->hidden_list)) {
123 /*
124 * don't remove the beacon entry if it has
125 * probe responses associated with it
126 */
127 if (!bss->pub.hidden_beacon_bss)
128 return false;
129 /*
130 * if it's a probe response entry break its
131 * link to the other entries in the group
132 */
133 list_del_init(&bss->hidden_list);
134 }
135
136 list_del_init(&bss->list);
137 rb_erase(&bss->rbn, &dev->bss_tree);
138 bss_ref_put(dev, bss);
139 return true;
140 }
141
142 static void __cfg80211_bss_expire(struct cfg80211_registered_device *dev,
143 unsigned long expire_time)
144 {
145 struct cfg80211_internal_bss *bss, *tmp;
146 bool expired = false;
147
148 lockdep_assert_held(&dev->bss_lock);
149
150 list_for_each_entry_safe(bss, tmp, &dev->bss_list, list) {
151 if (atomic_read(&bss->hold))
152 continue;
153 if (!time_after(expire_time, bss->ts))
154 continue;
155
156 if (__cfg80211_unlink_bss(dev, bss))
157 expired = true;
158 }
159
160 if (expired)
161 dev->bss_generation++;
162 }
163
164 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
165 bool send_message)
166 {
167 struct cfg80211_scan_request *request;
168 struct wireless_dev *wdev;
169 struct sk_buff *msg;
170 #ifdef CONFIG_CFG80211_WEXT
171 union iwreq_data wrqu;
172 #endif
173
174 ASSERT_RTNL();
175
176 if (rdev->scan_msg) {
177 nl80211_send_scan_result(rdev, rdev->scan_msg);
178 rdev->scan_msg = NULL;
179 return;
180 }
181
182 request = rdev->scan_req;
183 if (!request)
184 return;
185
186 wdev = request->wdev;
187
188 /*
189 * This must be before sending the other events!
190 * Otherwise, wpa_supplicant gets completely confused with
191 * wext events.
192 */
193 if (wdev->netdev)
194 cfg80211_sme_scan_done(wdev->netdev);
195
196 if (!request->aborted &&
197 request->flags & NL80211_SCAN_FLAG_FLUSH) {
198 /* flush entries from previous scans */
199 spin_lock_bh(&rdev->bss_lock);
200 __cfg80211_bss_expire(rdev, request->scan_start);
201 spin_unlock_bh(&rdev->bss_lock);
202 }
203
204 msg = nl80211_build_scan_msg(rdev, wdev, request->aborted);
205
206 #ifdef CONFIG_CFG80211_WEXT
207 if (wdev->netdev && !request->aborted) {
208 memset(&wrqu, 0, sizeof(wrqu));
209
210 wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
211 }
212 #endif
213
214 if (wdev->netdev)
215 dev_put(wdev->netdev);
216
217 rdev->scan_req = NULL;
218 kfree(request);
219
220 if (!send_message)
221 rdev->scan_msg = msg;
222 else
223 nl80211_send_scan_result(rdev, msg);
224 }
225
226 void __cfg80211_scan_done(struct work_struct *wk)
227 {
228 struct cfg80211_registered_device *rdev;
229
230 rdev = container_of(wk, struct cfg80211_registered_device,
231 scan_done_wk);
232
233 rtnl_lock();
234 ___cfg80211_scan_done(rdev, true);
235 rtnl_unlock();
236 }
237
238 void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
239 {
240 trace_cfg80211_scan_done(request, aborted);
241 WARN_ON(request != wiphy_to_dev(request->wiphy)->scan_req);
242
243 request->aborted = aborted;
244 request->notified = true;
245 queue_work(cfg80211_wq, &wiphy_to_dev(request->wiphy)->scan_done_wk);
246 }
247 EXPORT_SYMBOL(cfg80211_scan_done);
248
249 void __cfg80211_sched_scan_results(struct work_struct *wk)
250 {
251 struct cfg80211_registered_device *rdev;
252 struct cfg80211_sched_scan_request *request;
253
254 rdev = container_of(wk, struct cfg80211_registered_device,
255 sched_scan_results_wk);
256
257 rtnl_lock();
258
259 request = rdev->sched_scan_req;
260
261 /* we don't have sched_scan_req anymore if the scan is stopping */
262 if (request) {
263 if (request->flags & NL80211_SCAN_FLAG_FLUSH) {
264 /* flush entries from previous scans */
265 spin_lock_bh(&rdev->bss_lock);
266 __cfg80211_bss_expire(rdev, request->scan_start);
267 spin_unlock_bh(&rdev->bss_lock);
268 request->scan_start =
269 jiffies + msecs_to_jiffies(request->interval);
270 }
271 nl80211_send_sched_scan_results(rdev, request->dev);
272 }
273
274 rtnl_unlock();
275 }
276
277 void cfg80211_sched_scan_results(struct wiphy *wiphy)
278 {
279 trace_cfg80211_sched_scan_results(wiphy);
280 /* ignore if we're not scanning */
281 if (wiphy_to_dev(wiphy)->sched_scan_req)
282 queue_work(cfg80211_wq,
283 &wiphy_to_dev(wiphy)->sched_scan_results_wk);
284 }
285 EXPORT_SYMBOL(cfg80211_sched_scan_results);
286
287 void cfg80211_sched_scan_stopped(struct wiphy *wiphy)
288 {
289 struct cfg80211_registered_device *rdev = wiphy_to_dev(wiphy);
290
291 trace_cfg80211_sched_scan_stopped(wiphy);
292
293 rtnl_lock();
294 __cfg80211_stop_sched_scan(rdev, true);
295 rtnl_unlock();
296 }
297 EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
298
299 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
300 bool driver_initiated)
301 {
302 struct net_device *dev;
303
304 ASSERT_RTNL();
305
306 if (!rdev->sched_scan_req)
307 return -ENOENT;
308
309 dev = rdev->sched_scan_req->dev;
310
311 if (!driver_initiated) {
312 int err = rdev_sched_scan_stop(rdev, dev);
313 if (err)
314 return err;
315 }
316
317 nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED);
318
319 kfree(rdev->sched_scan_req);
320 rdev->sched_scan_req = NULL;
321
322 return 0;
323 }
324
325 void cfg80211_bss_age(struct cfg80211_registered_device *dev,
326 unsigned long age_secs)
327 {
328 struct cfg80211_internal_bss *bss;
329 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
330
331 spin_lock_bh(&dev->bss_lock);
332 list_for_each_entry(bss, &dev->bss_list, list)
333 bss->ts -= age_jiffies;
334 spin_unlock_bh(&dev->bss_lock);
335 }
336
337 void cfg80211_bss_expire(struct cfg80211_registered_device *dev)
338 {
339 __cfg80211_bss_expire(dev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
340 }
341
342 const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len)
343 {
344 while (len > 2 && ies[0] != eid) {
345 len -= ies[1] + 2;
346 ies += ies[1] + 2;
347 }
348 if (len < 2)
349 return NULL;
350 if (len < 2 + ies[1])
351 return NULL;
352 return ies;
353 }
354 EXPORT_SYMBOL(cfg80211_find_ie);
355
356 const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type,
357 const u8 *ies, int len)
358 {
359 struct ieee80211_vendor_ie *ie;
360 const u8 *pos = ies, *end = ies + len;
361 int ie_oui;
362
363 while (pos < end) {
364 pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos,
365 end - pos);
366 if (!pos)
367 return NULL;
368
369 ie = (struct ieee80211_vendor_ie *)pos;
370
371 /* make sure we can access ie->len */
372 BUILD_BUG_ON(offsetof(struct ieee80211_vendor_ie, len) != 1);
373
374 if (ie->len < sizeof(*ie))
375 goto cont;
376
377 ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2];
378 if (ie_oui == oui && ie->oui_type == oui_type)
379 return pos;
380 cont:
381 pos += 2 + ie->len;
382 }
383 return NULL;
384 }
385 EXPORT_SYMBOL(cfg80211_find_vendor_ie);
386
387 static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
388 const u8 *ssid, size_t ssid_len)
389 {
390 const struct cfg80211_bss_ies *ies;
391 const u8 *ssidie;
392
393 if (bssid && !ether_addr_equal(a->bssid, bssid))
394 return false;
395
396 if (!ssid)
397 return true;
398
399 ies = rcu_access_pointer(a->ies);
400 if (!ies)
401 return false;
402 ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
403 if (!ssidie)
404 return false;
405 if (ssidie[1] != ssid_len)
406 return false;
407 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
408 }
409
410 /**
411 * enum bss_compare_mode - BSS compare mode
412 * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
413 * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
414 * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
415 */
416 enum bss_compare_mode {
417 BSS_CMP_REGULAR,
418 BSS_CMP_HIDE_ZLEN,
419 BSS_CMP_HIDE_NUL,
420 };
421
422 static int cmp_bss(struct cfg80211_bss *a,
423 struct cfg80211_bss *b,
424 enum bss_compare_mode mode)
425 {
426 const struct cfg80211_bss_ies *a_ies, *b_ies;
427 const u8 *ie1 = NULL;
428 const u8 *ie2 = NULL;
429 int i, r;
430
431 if (a->channel != b->channel)
432 return b->channel->center_freq - a->channel->center_freq;
433
434 a_ies = rcu_access_pointer(a->ies);
435 if (!a_ies)
436 return -1;
437 b_ies = rcu_access_pointer(b->ies);
438 if (!b_ies)
439 return 1;
440
441 if (WLAN_CAPABILITY_IS_STA_BSS(a->capability))
442 ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID,
443 a_ies->data, a_ies->len);
444 if (WLAN_CAPABILITY_IS_STA_BSS(b->capability))
445 ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID,
446 b_ies->data, b_ies->len);
447 if (ie1 && ie2) {
448 int mesh_id_cmp;
449
450 if (ie1[1] == ie2[1])
451 mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]);
452 else
453 mesh_id_cmp = ie2[1] - ie1[1];
454
455 ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
456 a_ies->data, a_ies->len);
457 ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
458 b_ies->data, b_ies->len);
459 if (ie1 && ie2) {
460 if (mesh_id_cmp)
461 return mesh_id_cmp;
462 if (ie1[1] != ie2[1])
463 return ie2[1] - ie1[1];
464 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
465 }
466 }
467
468 r = memcmp(a->bssid, b->bssid, sizeof(a->bssid));
469 if (r)
470 return r;
471
472 ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
473 ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
474
475 if (!ie1 && !ie2)
476 return 0;
477
478 /*
479 * Note that with "hide_ssid", the function returns a match if
480 * the already-present BSS ("b") is a hidden SSID beacon for
481 * the new BSS ("a").
482 */
483
484 /* sort missing IE before (left of) present IE */
485 if (!ie1)
486 return -1;
487 if (!ie2)
488 return 1;
489
490 switch (mode) {
491 case BSS_CMP_HIDE_ZLEN:
492 /*
493 * In ZLEN mode we assume the BSS entry we're
494 * looking for has a zero-length SSID. So if
495 * the one we're looking at right now has that,
496 * return 0. Otherwise, return the difference
497 * in length, but since we're looking for the
498 * 0-length it's really equivalent to returning
499 * the length of the one we're looking at.
500 *
501 * No content comparison is needed as we assume
502 * the content length is zero.
503 */
504 return ie2[1];
505 case BSS_CMP_REGULAR:
506 default:
507 /* sort by length first, then by contents */
508 if (ie1[1] != ie2[1])
509 return ie2[1] - ie1[1];
510 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
511 case BSS_CMP_HIDE_NUL:
512 if (ie1[1] != ie2[1])
513 return ie2[1] - ie1[1];
514 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */
515 for (i = 0; i < ie2[1]; i++)
516 if (ie2[i + 2])
517 return -1;
518 return 0;
519 }
520 }
521
522 /* Returned bss is reference counted and must be cleaned up appropriately. */
523 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
524 struct ieee80211_channel *channel,
525 const u8 *bssid,
526 const u8 *ssid, size_t ssid_len,
527 u16 capa_mask, u16 capa_val)
528 {
529 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
530 struct cfg80211_internal_bss *bss, *res = NULL;
531 unsigned long now = jiffies;
532
533 trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, capa_mask,
534 capa_val);
535
536 spin_lock_bh(&dev->bss_lock);
537
538 list_for_each_entry(bss, &dev->bss_list, list) {
539 if ((bss->pub.capability & capa_mask) != capa_val)
540 continue;
541 if (channel && bss->pub.channel != channel)
542 continue;
543 /* Don't get expired BSS structs */
544 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
545 !atomic_read(&bss->hold))
546 continue;
547 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
548 res = bss;
549 bss_ref_get(dev, res);
550 break;
551 }
552 }
553
554 spin_unlock_bh(&dev->bss_lock);
555 if (!res)
556 return NULL;
557 trace_cfg80211_return_bss(&res->pub);
558 return &res->pub;
559 }
560 EXPORT_SYMBOL(cfg80211_get_bss);
561
562 static void rb_insert_bss(struct cfg80211_registered_device *dev,
563 struct cfg80211_internal_bss *bss)
564 {
565 struct rb_node **p = &dev->bss_tree.rb_node;
566 struct rb_node *parent = NULL;
567 struct cfg80211_internal_bss *tbss;
568 int cmp;
569
570 while (*p) {
571 parent = *p;
572 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
573
574 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR);
575
576 if (WARN_ON(!cmp)) {
577 /* will sort of leak this BSS */
578 return;
579 }
580
581 if (cmp < 0)
582 p = &(*p)->rb_left;
583 else
584 p = &(*p)->rb_right;
585 }
586
587 rb_link_node(&bss->rbn, parent, p);
588 rb_insert_color(&bss->rbn, &dev->bss_tree);
589 }
590
591 static struct cfg80211_internal_bss *
592 rb_find_bss(struct cfg80211_registered_device *dev,
593 struct cfg80211_internal_bss *res,
594 enum bss_compare_mode mode)
595 {
596 struct rb_node *n = dev->bss_tree.rb_node;
597 struct cfg80211_internal_bss *bss;
598 int r;
599
600 while (n) {
601 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
602 r = cmp_bss(&res->pub, &bss->pub, mode);
603
604 if (r == 0)
605 return bss;
606 else if (r < 0)
607 n = n->rb_left;
608 else
609 n = n->rb_right;
610 }
611
612 return NULL;
613 }
614
615 static bool cfg80211_combine_bsses(struct cfg80211_registered_device *dev,
616 struct cfg80211_internal_bss *new)
617 {
618 const struct cfg80211_bss_ies *ies;
619 struct cfg80211_internal_bss *bss;
620 const u8 *ie;
621 int i, ssidlen;
622 u8 fold = 0;
623
624 ies = rcu_access_pointer(new->pub.beacon_ies);
625 if (WARN_ON(!ies))
626 return false;
627
628 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
629 if (!ie) {
630 /* nothing to do */
631 return true;
632 }
633
634 ssidlen = ie[1];
635 for (i = 0; i < ssidlen; i++)
636 fold |= ie[2 + i];
637
638 if (fold) {
639 /* not a hidden SSID */
640 return true;
641 }
642
643 /* This is the bad part ... */
644
645 list_for_each_entry(bss, &dev->bss_list, list) {
646 if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid))
647 continue;
648 if (bss->pub.channel != new->pub.channel)
649 continue;
650 if (bss->pub.scan_width != new->pub.scan_width)
651 continue;
652 if (rcu_access_pointer(bss->pub.beacon_ies))
653 continue;
654 ies = rcu_access_pointer(bss->pub.ies);
655 if (!ies)
656 continue;
657 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
658 if (!ie)
659 continue;
660 if (ssidlen && ie[1] != ssidlen)
661 continue;
662 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss))
663 continue;
664 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list)))
665 list_del(&bss->hidden_list);
666 /* combine them */
667 list_add(&bss->hidden_list, &new->hidden_list);
668 bss->pub.hidden_beacon_bss = &new->pub;
669 new->refcount += bss->refcount;
670 rcu_assign_pointer(bss->pub.beacon_ies,
671 new->pub.beacon_ies);
672 }
673
674 return true;
675 }
676
677 /* Returned bss is reference counted and must be cleaned up appropriately. */
678 static struct cfg80211_internal_bss *
679 cfg80211_bss_update(struct cfg80211_registered_device *dev,
680 struct cfg80211_internal_bss *tmp,
681 bool signal_valid)
682 {
683 struct cfg80211_internal_bss *found = NULL;
684
685 if (WARN_ON(!tmp->pub.channel))
686 return NULL;
687
688 tmp->ts = jiffies;
689
690 spin_lock_bh(&dev->bss_lock);
691
692 if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
693 spin_unlock_bh(&dev->bss_lock);
694 return NULL;
695 }
696
697 found = rb_find_bss(dev, tmp, BSS_CMP_REGULAR);
698
699 if (found) {
700 /* Update IEs */
701 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
702 const struct cfg80211_bss_ies *old;
703
704 old = rcu_access_pointer(found->pub.proberesp_ies);
705
706 rcu_assign_pointer(found->pub.proberesp_ies,
707 tmp->pub.proberesp_ies);
708 /* Override possible earlier Beacon frame IEs */
709 rcu_assign_pointer(found->pub.ies,
710 tmp->pub.proberesp_ies);
711 if (old)
712 kfree_rcu((struct cfg80211_bss_ies *)old,
713 rcu_head);
714 } else if (rcu_access_pointer(tmp->pub.beacon_ies)) {
715 const struct cfg80211_bss_ies *old;
716 struct cfg80211_internal_bss *bss;
717
718 if (found->pub.hidden_beacon_bss &&
719 !list_empty(&found->hidden_list)) {
720 const struct cfg80211_bss_ies *f;
721
722 /*
723 * The found BSS struct is one of the probe
724 * response members of a group, but we're
725 * receiving a beacon (beacon_ies in the tmp
726 * bss is used). This can only mean that the
727 * AP changed its beacon from not having an
728 * SSID to showing it, which is confusing so
729 * drop this information.
730 */
731
732 f = rcu_access_pointer(tmp->pub.beacon_ies);
733 kfree_rcu((struct cfg80211_bss_ies *)f,
734 rcu_head);
735 goto drop;
736 }
737
738 old = rcu_access_pointer(found->pub.beacon_ies);
739
740 rcu_assign_pointer(found->pub.beacon_ies,
741 tmp->pub.beacon_ies);
742
743 /* Override IEs if they were from a beacon before */
744 if (old == rcu_access_pointer(found->pub.ies))
745 rcu_assign_pointer(found->pub.ies,
746 tmp->pub.beacon_ies);
747
748 /* Assign beacon IEs to all sub entries */
749 list_for_each_entry(bss, &found->hidden_list,
750 hidden_list) {
751 const struct cfg80211_bss_ies *ies;
752
753 ies = rcu_access_pointer(bss->pub.beacon_ies);
754 WARN_ON(ies != old);
755
756 rcu_assign_pointer(bss->pub.beacon_ies,
757 tmp->pub.beacon_ies);
758 }
759
760 if (old)
761 kfree_rcu((struct cfg80211_bss_ies *)old,
762 rcu_head);
763 }
764
765 found->pub.beacon_interval = tmp->pub.beacon_interval;
766 /*
767 * don't update the signal if beacon was heard on
768 * adjacent channel.
769 */
770 if (signal_valid)
771 found->pub.signal = tmp->pub.signal;
772 found->pub.capability = tmp->pub.capability;
773 found->ts = tmp->ts;
774 } else {
775 struct cfg80211_internal_bss *new;
776 struct cfg80211_internal_bss *hidden;
777 struct cfg80211_bss_ies *ies;
778
779 /*
780 * create a copy -- the "res" variable that is passed in
781 * is allocated on the stack since it's not needed in the
782 * more common case of an update
783 */
784 new = kzalloc(sizeof(*new) + dev->wiphy.bss_priv_size,
785 GFP_ATOMIC);
786 if (!new) {
787 ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
788 if (ies)
789 kfree_rcu(ies, rcu_head);
790 ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
791 if (ies)
792 kfree_rcu(ies, rcu_head);
793 goto drop;
794 }
795 memcpy(new, tmp, sizeof(*new));
796 new->refcount = 1;
797 INIT_LIST_HEAD(&new->hidden_list);
798
799 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
800 hidden = rb_find_bss(dev, tmp, BSS_CMP_HIDE_ZLEN);
801 if (!hidden)
802 hidden = rb_find_bss(dev, tmp,
803 BSS_CMP_HIDE_NUL);
804 if (hidden) {
805 new->pub.hidden_beacon_bss = &hidden->pub;
806 list_add(&new->hidden_list,
807 &hidden->hidden_list);
808 hidden->refcount++;
809 rcu_assign_pointer(new->pub.beacon_ies,
810 hidden->pub.beacon_ies);
811 }
812 } else {
813 /*
814 * Ok so we found a beacon, and don't have an entry. If
815 * it's a beacon with hidden SSID, we might be in for an
816 * expensive search for any probe responses that should
817 * be grouped with this beacon for updates ...
818 */
819 if (!cfg80211_combine_bsses(dev, new)) {
820 kfree(new);
821 goto drop;
822 }
823 }
824
825 list_add_tail(&new->list, &dev->bss_list);
826 rb_insert_bss(dev, new);
827 found = new;
828 }
829
830 dev->bss_generation++;
831 bss_ref_get(dev, found);
832 spin_unlock_bh(&dev->bss_lock);
833
834 return found;
835 drop:
836 spin_unlock_bh(&dev->bss_lock);
837 return NULL;
838 }
839
840 static struct ieee80211_channel *
841 cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
842 struct ieee80211_channel *channel)
843 {
844 const u8 *tmp;
845 u32 freq;
846 int channel_number = -1;
847
848 tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen);
849 if (tmp && tmp[1] == 1) {
850 channel_number = tmp[2];
851 } else {
852 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen);
853 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) {
854 struct ieee80211_ht_operation *htop = (void *)(tmp + 2);
855
856 channel_number = htop->primary_chan;
857 }
858 }
859
860 if (channel_number < 0)
861 return channel;
862
863 freq = ieee80211_channel_to_frequency(channel_number, channel->band);
864 channel = ieee80211_get_channel(wiphy, freq);
865 if (!channel)
866 return NULL;
867 if (channel->flags & IEEE80211_CHAN_DISABLED)
868 return NULL;
869 return channel;
870 }
871
872 /* Returned bss is reference counted and must be cleaned up appropriately. */
873 struct cfg80211_bss*
874 cfg80211_inform_bss_width(struct wiphy *wiphy,
875 struct ieee80211_channel *rx_channel,
876 enum nl80211_bss_scan_width scan_width,
877 const u8 *bssid, u64 tsf, u16 capability,
878 u16 beacon_interval, const u8 *ie, size_t ielen,
879 s32 signal, gfp_t gfp)
880 {
881 struct cfg80211_bss_ies *ies;
882 struct ieee80211_channel *channel;
883 struct cfg80211_internal_bss tmp = {}, *res;
884
885 if (WARN_ON(!wiphy))
886 return NULL;
887
888 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
889 (signal < 0 || signal > 100)))
890 return NULL;
891
892 channel = cfg80211_get_bss_channel(wiphy, ie, ielen, rx_channel);
893 if (!channel)
894 return NULL;
895
896 memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
897 tmp.pub.channel = channel;
898 tmp.pub.scan_width = scan_width;
899 tmp.pub.signal = signal;
900 tmp.pub.beacon_interval = beacon_interval;
901 tmp.pub.capability = capability;
902 /*
903 * Since we do not know here whether the IEs are from a Beacon or Probe
904 * Response frame, we need to pick one of the options and only use it
905 * with the driver that does not provide the full Beacon/Probe Response
906 * frame. Use Beacon frame pointer to avoid indicating that this should
907 * override the IEs pointer should we have received an earlier
908 * indication of Probe Response data.
909 */
910 ies = kmalloc(sizeof(*ies) + ielen, gfp);
911 if (!ies)
912 return NULL;
913 ies->len = ielen;
914 ies->tsf = tsf;
915 memcpy(ies->data, ie, ielen);
916
917 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
918 rcu_assign_pointer(tmp.pub.ies, ies);
919
920 res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp,
921 rx_channel == channel);
922 if (!res)
923 return NULL;
924
925 if (res->pub.capability & WLAN_CAPABILITY_ESS)
926 regulatory_hint_found_beacon(wiphy, channel, gfp);
927
928 trace_cfg80211_return_bss(&res->pub);
929 /* cfg80211_bss_update gives us a referenced result */
930 return &res->pub;
931 }
932 EXPORT_SYMBOL(cfg80211_inform_bss_width);
933
934 /* Returned bss is reference counted and must be cleaned up appropriately. */
935 struct cfg80211_bss *
936 cfg80211_inform_bss_width_frame(struct wiphy *wiphy,
937 struct ieee80211_channel *rx_channel,
938 enum nl80211_bss_scan_width scan_width,
939 struct ieee80211_mgmt *mgmt, size_t len,
940 s32 signal, gfp_t gfp)
941 {
942 struct cfg80211_internal_bss tmp = {}, *res;
943 struct cfg80211_bss_ies *ies;
944 struct ieee80211_channel *channel;
945 size_t ielen = len - offsetof(struct ieee80211_mgmt,
946 u.probe_resp.variable);
947
948 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
949 offsetof(struct ieee80211_mgmt, u.beacon.variable));
950
951 trace_cfg80211_inform_bss_width_frame(wiphy, rx_channel, scan_width, mgmt,
952 len, signal);
953
954 if (WARN_ON(!mgmt))
955 return NULL;
956
957 if (WARN_ON(!wiphy))
958 return NULL;
959
960 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
961 (signal < 0 || signal > 100)))
962 return NULL;
963
964 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
965 return NULL;
966
967 channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable,
968 ielen, rx_channel);
969 if (!channel)
970 return NULL;
971
972 ies = kmalloc(sizeof(*ies) + ielen, gfp);
973 if (!ies)
974 return NULL;
975 ies->len = ielen;
976 ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
977 memcpy(ies->data, mgmt->u.probe_resp.variable, ielen);
978
979 if (ieee80211_is_probe_resp(mgmt->frame_control))
980 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
981 else
982 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
983 rcu_assign_pointer(tmp.pub.ies, ies);
984
985 memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN);
986 tmp.pub.channel = channel;
987 tmp.pub.scan_width = scan_width;
988 tmp.pub.signal = signal;
989 tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
990 tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
991
992 res = cfg80211_bss_update(wiphy_to_dev(wiphy), &tmp,
993 rx_channel == channel);
994 if (!res)
995 return NULL;
996
997 if (res->pub.capability & WLAN_CAPABILITY_ESS)
998 regulatory_hint_found_beacon(wiphy, channel, gfp);
999
1000 trace_cfg80211_return_bss(&res->pub);
1001 /* cfg80211_bss_update gives us a referenced result */
1002 return &res->pub;
1003 }
1004 EXPORT_SYMBOL(cfg80211_inform_bss_width_frame);
1005
1006 void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1007 {
1008 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
1009 struct cfg80211_internal_bss *bss;
1010
1011 if (!pub)
1012 return;
1013
1014 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1015
1016 spin_lock_bh(&dev->bss_lock);
1017 bss_ref_get(dev, bss);
1018 spin_unlock_bh(&dev->bss_lock);
1019 }
1020 EXPORT_SYMBOL(cfg80211_ref_bss);
1021
1022 void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1023 {
1024 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
1025 struct cfg80211_internal_bss *bss;
1026
1027 if (!pub)
1028 return;
1029
1030 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1031
1032 spin_lock_bh(&dev->bss_lock);
1033 bss_ref_put(dev, bss);
1034 spin_unlock_bh(&dev->bss_lock);
1035 }
1036 EXPORT_SYMBOL(cfg80211_put_bss);
1037
1038 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1039 {
1040 struct cfg80211_registered_device *dev = wiphy_to_dev(wiphy);
1041 struct cfg80211_internal_bss *bss;
1042
1043 if (WARN_ON(!pub))
1044 return;
1045
1046 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1047
1048 spin_lock_bh(&dev->bss_lock);
1049 if (!list_empty(&bss->list)) {
1050 if (__cfg80211_unlink_bss(dev, bss))
1051 dev->bss_generation++;
1052 }
1053 spin_unlock_bh(&dev->bss_lock);
1054 }
1055 EXPORT_SYMBOL(cfg80211_unlink_bss);
1056
1057 #ifdef CONFIG_CFG80211_WEXT
1058 static struct cfg80211_registered_device *
1059 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
1060 {
1061 struct cfg80211_registered_device *rdev;
1062 struct net_device *dev;
1063
1064 ASSERT_RTNL();
1065
1066 dev = dev_get_by_index(net, ifindex);
1067 if (!dev)
1068 return ERR_PTR(-ENODEV);
1069 if (dev->ieee80211_ptr)
1070 rdev = wiphy_to_dev(dev->ieee80211_ptr->wiphy);
1071 else
1072 rdev = ERR_PTR(-ENODEV);
1073 dev_put(dev);
1074 return rdev;
1075 }
1076
1077 int cfg80211_wext_siwscan(struct net_device *dev,
1078 struct iw_request_info *info,
1079 union iwreq_data *wrqu, char *extra)
1080 {
1081 struct cfg80211_registered_device *rdev;
1082 struct wiphy *wiphy;
1083 struct iw_scan_req *wreq = NULL;
1084 struct cfg80211_scan_request *creq = NULL;
1085 int i, err, n_channels = 0;
1086 enum ieee80211_band band;
1087
1088 if (!netif_running(dev))
1089 return -ENETDOWN;
1090
1091 if (wrqu->data.length == sizeof(struct iw_scan_req))
1092 wreq = (struct iw_scan_req *)extra;
1093
1094 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1095
1096 if (IS_ERR(rdev))
1097 return PTR_ERR(rdev);
1098
1099 if (rdev->scan_req || rdev->scan_msg) {
1100 err = -EBUSY;
1101 goto out;
1102 }
1103
1104 wiphy = &rdev->wiphy;
1105
1106 /* Determine number of channels, needed to allocate creq */
1107 if (wreq && wreq->num_channels)
1108 n_channels = wreq->num_channels;
1109 else
1110 n_channels = ieee80211_get_num_supported_channels(wiphy);
1111
1112 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
1113 n_channels * sizeof(void *),
1114 GFP_ATOMIC);
1115 if (!creq) {
1116 err = -ENOMEM;
1117 goto out;
1118 }
1119
1120 creq->wiphy = wiphy;
1121 creq->wdev = dev->ieee80211_ptr;
1122 /* SSIDs come after channels */
1123 creq->ssids = (void *)&creq->channels[n_channels];
1124 creq->n_channels = n_channels;
1125 creq->n_ssids = 1;
1126 creq->scan_start = jiffies;
1127
1128 /* translate "Scan on frequencies" request */
1129 i = 0;
1130 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1131 int j;
1132
1133 if (!wiphy->bands[band])
1134 continue;
1135
1136 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
1137 /* ignore disabled channels */
1138 if (wiphy->bands[band]->channels[j].flags &
1139 IEEE80211_CHAN_DISABLED)
1140 continue;
1141
1142 /* If we have a wireless request structure and the
1143 * wireless request specifies frequencies, then search
1144 * for the matching hardware channel.
1145 */
1146 if (wreq && wreq->num_channels) {
1147 int k;
1148 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
1149 for (k = 0; k < wreq->num_channels; k++) {
1150 int wext_freq = cfg80211_wext_freq(wiphy, &wreq->channel_list[k]);
1151 if (wext_freq == wiphy_freq)
1152 goto wext_freq_found;
1153 }
1154 goto wext_freq_not_found;
1155 }
1156
1157 wext_freq_found:
1158 creq->channels[i] = &wiphy->bands[band]->channels[j];
1159 i++;
1160 wext_freq_not_found: ;
1161 }
1162 }
1163 /* No channels found? */
1164 if (!i) {
1165 err = -EINVAL;
1166 goto out;
1167 }
1168
1169 /* Set real number of channels specified in creq->channels[] */
1170 creq->n_channels = i;
1171
1172 /* translate "Scan for SSID" request */
1173 if (wreq) {
1174 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
1175 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
1176 err = -EINVAL;
1177 goto out;
1178 }
1179 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
1180 creq->ssids[0].ssid_len = wreq->essid_len;
1181 }
1182 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
1183 creq->n_ssids = 0;
1184 }
1185
1186 for (i = 0; i < IEEE80211_NUM_BANDS; i++)
1187 if (wiphy->bands[i])
1188 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
1189
1190 rdev->scan_req = creq;
1191 err = rdev_scan(rdev, creq);
1192 if (err) {
1193 rdev->scan_req = NULL;
1194 /* creq will be freed below */
1195 } else {
1196 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
1197 /* creq now owned by driver */
1198 creq = NULL;
1199 dev_hold(dev);
1200 }
1201 out:
1202 kfree(creq);
1203 return err;
1204 }
1205 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
1206
1207 static void ieee80211_scan_add_ies(struct iw_request_info *info,
1208 const struct cfg80211_bss_ies *ies,
1209 char **current_ev, char *end_buf)
1210 {
1211 const u8 *pos, *end, *next;
1212 struct iw_event iwe;
1213
1214 if (!ies)
1215 return;
1216
1217 /*
1218 * If needed, fragment the IEs buffer (at IE boundaries) into short
1219 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
1220 */
1221 pos = ies->data;
1222 end = pos + ies->len;
1223
1224 while (end - pos > IW_GENERIC_IE_MAX) {
1225 next = pos + 2 + pos[1];
1226 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
1227 next = next + 2 + next[1];
1228
1229 memset(&iwe, 0, sizeof(iwe));
1230 iwe.cmd = IWEVGENIE;
1231 iwe.u.data.length = next - pos;
1232 *current_ev = iwe_stream_add_point(info, *current_ev,
1233 end_buf, &iwe,
1234 (void *)pos);
1235
1236 pos = next;
1237 }
1238
1239 if (end > pos) {
1240 memset(&iwe, 0, sizeof(iwe));
1241 iwe.cmd = IWEVGENIE;
1242 iwe.u.data.length = end - pos;
1243 *current_ev = iwe_stream_add_point(info, *current_ev,
1244 end_buf, &iwe,
1245 (void *)pos);
1246 }
1247 }
1248
1249 static char *
1250 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
1251 struct cfg80211_internal_bss *bss, char *current_ev,
1252 char *end_buf)
1253 {
1254 const struct cfg80211_bss_ies *ies;
1255 struct iw_event iwe;
1256 const u8 *ie;
1257 u8 *buf, *cfg, *p;
1258 int rem, i, sig;
1259 bool ismesh = false;
1260
1261 memset(&iwe, 0, sizeof(iwe));
1262 iwe.cmd = SIOCGIWAP;
1263 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1264 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
1265 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1266 IW_EV_ADDR_LEN);
1267
1268 memset(&iwe, 0, sizeof(iwe));
1269 iwe.cmd = SIOCGIWFREQ;
1270 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
1271 iwe.u.freq.e = 0;
1272 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1273 IW_EV_FREQ_LEN);
1274
1275 memset(&iwe, 0, sizeof(iwe));
1276 iwe.cmd = SIOCGIWFREQ;
1277 iwe.u.freq.m = bss->pub.channel->center_freq;
1278 iwe.u.freq.e = 6;
1279 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1280 IW_EV_FREQ_LEN);
1281
1282 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
1283 memset(&iwe, 0, sizeof(iwe));
1284 iwe.cmd = IWEVQUAL;
1285 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
1286 IW_QUAL_NOISE_INVALID |
1287 IW_QUAL_QUAL_UPDATED;
1288 switch (wiphy->signal_type) {
1289 case CFG80211_SIGNAL_TYPE_MBM:
1290 sig = bss->pub.signal / 100;
1291 iwe.u.qual.level = sig;
1292 iwe.u.qual.updated |= IW_QUAL_DBM;
1293 if (sig < -110) /* rather bad */
1294 sig = -110;
1295 else if (sig > -40) /* perfect */
1296 sig = -40;
1297 /* will give a range of 0 .. 70 */
1298 iwe.u.qual.qual = sig + 110;
1299 break;
1300 case CFG80211_SIGNAL_TYPE_UNSPEC:
1301 iwe.u.qual.level = bss->pub.signal;
1302 /* will give range 0 .. 100 */
1303 iwe.u.qual.qual = bss->pub.signal;
1304 break;
1305 default:
1306 /* not reached */
1307 break;
1308 }
1309 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1310 &iwe, IW_EV_QUAL_LEN);
1311 }
1312
1313 memset(&iwe, 0, sizeof(iwe));
1314 iwe.cmd = SIOCGIWENCODE;
1315 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
1316 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1317 else
1318 iwe.u.data.flags = IW_ENCODE_DISABLED;
1319 iwe.u.data.length = 0;
1320 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1321 &iwe, "");
1322
1323 rcu_read_lock();
1324 ies = rcu_dereference(bss->pub.ies);
1325 rem = ies->len;
1326 ie = ies->data;
1327
1328 while (rem >= 2) {
1329 /* invalid data */
1330 if (ie[1] > rem - 2)
1331 break;
1332
1333 switch (ie[0]) {
1334 case WLAN_EID_SSID:
1335 memset(&iwe, 0, sizeof(iwe));
1336 iwe.cmd = SIOCGIWESSID;
1337 iwe.u.data.length = ie[1];
1338 iwe.u.data.flags = 1;
1339 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1340 &iwe, (u8 *)ie + 2);
1341 break;
1342 case WLAN_EID_MESH_ID:
1343 memset(&iwe, 0, sizeof(iwe));
1344 iwe.cmd = SIOCGIWESSID;
1345 iwe.u.data.length = ie[1];
1346 iwe.u.data.flags = 1;
1347 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1348 &iwe, (u8 *)ie + 2);
1349 break;
1350 case WLAN_EID_MESH_CONFIG:
1351 ismesh = true;
1352 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
1353 break;
1354 buf = kmalloc(50, GFP_ATOMIC);
1355 if (!buf)
1356 break;
1357 cfg = (u8 *)ie + 2;
1358 memset(&iwe, 0, sizeof(iwe));
1359 iwe.cmd = IWEVCUSTOM;
1360 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
1361 "0x%02X", cfg[0]);
1362 iwe.u.data.length = strlen(buf);
1363 current_ev = iwe_stream_add_point(info, current_ev,
1364 end_buf,
1365 &iwe, buf);
1366 sprintf(buf, "Path Selection Metric ID: 0x%02X",
1367 cfg[1]);
1368 iwe.u.data.length = strlen(buf);
1369 current_ev = iwe_stream_add_point(info, current_ev,
1370 end_buf,
1371 &iwe, buf);
1372 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
1373 cfg[2]);
1374 iwe.u.data.length = strlen(buf);
1375 current_ev = iwe_stream_add_point(info, current_ev,
1376 end_buf,
1377 &iwe, buf);
1378 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
1379 iwe.u.data.length = strlen(buf);
1380 current_ev = iwe_stream_add_point(info, current_ev,
1381 end_buf,
1382 &iwe, buf);
1383 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
1384 iwe.u.data.length = strlen(buf);
1385 current_ev = iwe_stream_add_point(info, current_ev,
1386 end_buf,
1387 &iwe, buf);
1388 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
1389 iwe.u.data.length = strlen(buf);
1390 current_ev = iwe_stream_add_point(info, current_ev,
1391 end_buf,
1392 &iwe, buf);
1393 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
1394 iwe.u.data.length = strlen(buf);
1395 current_ev = iwe_stream_add_point(info, current_ev,
1396 end_buf,
1397 &iwe, buf);
1398 kfree(buf);
1399 break;
1400 case WLAN_EID_SUPP_RATES:
1401 case WLAN_EID_EXT_SUPP_RATES:
1402 /* display all supported rates in readable format */
1403 p = current_ev + iwe_stream_lcp_len(info);
1404
1405 memset(&iwe, 0, sizeof(iwe));
1406 iwe.cmd = SIOCGIWRATE;
1407 /* Those two flags are ignored... */
1408 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
1409
1410 for (i = 0; i < ie[1]; i++) {
1411 iwe.u.bitrate.value =
1412 ((ie[i + 2] & 0x7f) * 500000);
1413 p = iwe_stream_add_value(info, current_ev, p,
1414 end_buf, &iwe, IW_EV_PARAM_LEN);
1415 }
1416 current_ev = p;
1417 break;
1418 }
1419 rem -= ie[1] + 2;
1420 ie += ie[1] + 2;
1421 }
1422
1423 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
1424 ismesh) {
1425 memset(&iwe, 0, sizeof(iwe));
1426 iwe.cmd = SIOCGIWMODE;
1427 if (ismesh)
1428 iwe.u.mode = IW_MODE_MESH;
1429 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
1430 iwe.u.mode = IW_MODE_MASTER;
1431 else
1432 iwe.u.mode = IW_MODE_ADHOC;
1433 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1434 &iwe, IW_EV_UINT_LEN);
1435 }
1436
1437 buf = kmalloc(31, GFP_ATOMIC);
1438 if (buf) {
1439 memset(&iwe, 0, sizeof(iwe));
1440 iwe.cmd = IWEVCUSTOM;
1441 sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
1442 iwe.u.data.length = strlen(buf);
1443 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1444 &iwe, buf);
1445 memset(&iwe, 0, sizeof(iwe));
1446 iwe.cmd = IWEVCUSTOM;
1447 sprintf(buf, " Last beacon: %ums ago",
1448 elapsed_jiffies_msecs(bss->ts));
1449 iwe.u.data.length = strlen(buf);
1450 current_ev = iwe_stream_add_point(info, current_ev,
1451 end_buf, &iwe, buf);
1452 kfree(buf);
1453 }
1454
1455 ieee80211_scan_add_ies(info, ies, &current_ev, end_buf);
1456 rcu_read_unlock();
1457
1458 return current_ev;
1459 }
1460
1461
1462 static int ieee80211_scan_results(struct cfg80211_registered_device *dev,
1463 struct iw_request_info *info,
1464 char *buf, size_t len)
1465 {
1466 char *current_ev = buf;
1467 char *end_buf = buf + len;
1468 struct cfg80211_internal_bss *bss;
1469
1470 spin_lock_bh(&dev->bss_lock);
1471 cfg80211_bss_expire(dev);
1472
1473 list_for_each_entry(bss, &dev->bss_list, list) {
1474 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
1475 spin_unlock_bh(&dev->bss_lock);
1476 return -E2BIG;
1477 }
1478 current_ev = ieee80211_bss(&dev->wiphy, info, bss,
1479 current_ev, end_buf);
1480 }
1481 spin_unlock_bh(&dev->bss_lock);
1482 return current_ev - buf;
1483 }
1484
1485
1486 int cfg80211_wext_giwscan(struct net_device *dev,
1487 struct iw_request_info *info,
1488 struct iw_point *data, char *extra)
1489 {
1490 struct cfg80211_registered_device *rdev;
1491 int res;
1492
1493 if (!netif_running(dev))
1494 return -ENETDOWN;
1495
1496 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1497
1498 if (IS_ERR(rdev))
1499 return PTR_ERR(rdev);
1500
1501 if (rdev->scan_req || rdev->scan_msg)
1502 return -EAGAIN;
1503
1504 res = ieee80211_scan_results(rdev, info, extra, data->length);
1505 data->length = 0;
1506 if (res >= 0) {
1507 data->length = res;
1508 res = 0;
1509 }
1510
1511 return res;
1512 }
1513 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);
1514 #endif
Linux kernel - Deliverables
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