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Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[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 *rdev,
85 struct cfg80211_internal_bss *bss)
86 {
87 lockdep_assert_held(&rdev->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 *rdev,
99 struct cfg80211_internal_bss *bss)
100 {
101 lockdep_assert_held(&rdev->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 *rdev,
118 struct cfg80211_internal_bss *bss)
119 {
120 lockdep_assert_held(&rdev->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, &rdev->bss_tree);
138 bss_ref_put(rdev, bss);
139 return true;
140 }
141
142 static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev,
143 unsigned long expire_time)
144 {
145 struct cfg80211_internal_bss *bss, *tmp;
146 bool expired = false;
147
148 lockdep_assert_held(&rdev->bss_lock);
149
150 list_for_each_entry_safe(bss, tmp, &rdev->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(rdev, bss))
157 expired = true;
158 }
159
160 if (expired)
161 rdev->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_rdev(request->wiphy)->scan_req);
242
243 request->aborted = aborted;
244 request->notified = true;
245 queue_work(cfg80211_wq, &wiphy_to_rdev(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_rdev(wiphy)->sched_scan_req)
282 queue_work(cfg80211_wq,
283 &wiphy_to_rdev(wiphy)->sched_scan_results_wk);
284 }
285 EXPORT_SYMBOL(cfg80211_sched_scan_results);
286
287 void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy)
288 {
289 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
290
291 ASSERT_RTNL();
292
293 trace_cfg80211_sched_scan_stopped(wiphy);
294
295 __cfg80211_stop_sched_scan(rdev, true);
296 }
297 EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl);
298
299 void cfg80211_sched_scan_stopped(struct wiphy *wiphy)
300 {
301 rtnl_lock();
302 cfg80211_sched_scan_stopped_rtnl(wiphy);
303 rtnl_unlock();
304 }
305 EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
306
307 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
308 bool driver_initiated)
309 {
310 struct net_device *dev;
311
312 ASSERT_RTNL();
313
314 if (!rdev->sched_scan_req)
315 return -ENOENT;
316
317 dev = rdev->sched_scan_req->dev;
318
319 if (!driver_initiated) {
320 int err = rdev_sched_scan_stop(rdev, dev);
321 if (err)
322 return err;
323 }
324
325 nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED);
326
327 kfree(rdev->sched_scan_req);
328 rdev->sched_scan_req = NULL;
329
330 return 0;
331 }
332
333 void cfg80211_bss_age(struct cfg80211_registered_device *rdev,
334 unsigned long age_secs)
335 {
336 struct cfg80211_internal_bss *bss;
337 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
338
339 spin_lock_bh(&rdev->bss_lock);
340 list_for_each_entry(bss, &rdev->bss_list, list)
341 bss->ts -= age_jiffies;
342 spin_unlock_bh(&rdev->bss_lock);
343 }
344
345 void cfg80211_bss_expire(struct cfg80211_registered_device *rdev)
346 {
347 __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
348 }
349
350 const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len)
351 {
352 while (len > 2 && ies[0] != eid) {
353 len -= ies[1] + 2;
354 ies += ies[1] + 2;
355 }
356 if (len < 2)
357 return NULL;
358 if (len < 2 + ies[1])
359 return NULL;
360 return ies;
361 }
362 EXPORT_SYMBOL(cfg80211_find_ie);
363
364 const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type,
365 const u8 *ies, int len)
366 {
367 struct ieee80211_vendor_ie *ie;
368 const u8 *pos = ies, *end = ies + len;
369 int ie_oui;
370
371 while (pos < end) {
372 pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos,
373 end - pos);
374 if (!pos)
375 return NULL;
376
377 ie = (struct ieee80211_vendor_ie *)pos;
378
379 /* make sure we can access ie->len */
380 BUILD_BUG_ON(offsetof(struct ieee80211_vendor_ie, len) != 1);
381
382 if (ie->len < sizeof(*ie))
383 goto cont;
384
385 ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2];
386 if (ie_oui == oui && ie->oui_type == oui_type)
387 return pos;
388 cont:
389 pos += 2 + ie->len;
390 }
391 return NULL;
392 }
393 EXPORT_SYMBOL(cfg80211_find_vendor_ie);
394
395 static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
396 const u8 *ssid, size_t ssid_len)
397 {
398 const struct cfg80211_bss_ies *ies;
399 const u8 *ssidie;
400
401 if (bssid && !ether_addr_equal(a->bssid, bssid))
402 return false;
403
404 if (!ssid)
405 return true;
406
407 ies = rcu_access_pointer(a->ies);
408 if (!ies)
409 return false;
410 ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
411 if (!ssidie)
412 return false;
413 if (ssidie[1] != ssid_len)
414 return false;
415 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
416 }
417
418 /**
419 * enum bss_compare_mode - BSS compare mode
420 * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
421 * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
422 * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
423 */
424 enum bss_compare_mode {
425 BSS_CMP_REGULAR,
426 BSS_CMP_HIDE_ZLEN,
427 BSS_CMP_HIDE_NUL,
428 };
429
430 static int cmp_bss(struct cfg80211_bss *a,
431 struct cfg80211_bss *b,
432 enum bss_compare_mode mode)
433 {
434 const struct cfg80211_bss_ies *a_ies, *b_ies;
435 const u8 *ie1 = NULL;
436 const u8 *ie2 = NULL;
437 int i, r;
438
439 if (a->channel != b->channel)
440 return b->channel->center_freq - a->channel->center_freq;
441
442 a_ies = rcu_access_pointer(a->ies);
443 if (!a_ies)
444 return -1;
445 b_ies = rcu_access_pointer(b->ies);
446 if (!b_ies)
447 return 1;
448
449 if (WLAN_CAPABILITY_IS_STA_BSS(a->capability))
450 ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID,
451 a_ies->data, a_ies->len);
452 if (WLAN_CAPABILITY_IS_STA_BSS(b->capability))
453 ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID,
454 b_ies->data, b_ies->len);
455 if (ie1 && ie2) {
456 int mesh_id_cmp;
457
458 if (ie1[1] == ie2[1])
459 mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]);
460 else
461 mesh_id_cmp = ie2[1] - ie1[1];
462
463 ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
464 a_ies->data, a_ies->len);
465 ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
466 b_ies->data, b_ies->len);
467 if (ie1 && ie2) {
468 if (mesh_id_cmp)
469 return mesh_id_cmp;
470 if (ie1[1] != ie2[1])
471 return ie2[1] - ie1[1];
472 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
473 }
474 }
475
476 r = memcmp(a->bssid, b->bssid, sizeof(a->bssid));
477 if (r)
478 return r;
479
480 ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
481 ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
482
483 if (!ie1 && !ie2)
484 return 0;
485
486 /*
487 * Note that with "hide_ssid", the function returns a match if
488 * the already-present BSS ("b") is a hidden SSID beacon for
489 * the new BSS ("a").
490 */
491
492 /* sort missing IE before (left of) present IE */
493 if (!ie1)
494 return -1;
495 if (!ie2)
496 return 1;
497
498 switch (mode) {
499 case BSS_CMP_HIDE_ZLEN:
500 /*
501 * In ZLEN mode we assume the BSS entry we're
502 * looking for has a zero-length SSID. So if
503 * the one we're looking at right now has that,
504 * return 0. Otherwise, return the difference
505 * in length, but since we're looking for the
506 * 0-length it's really equivalent to returning
507 * the length of the one we're looking at.
508 *
509 * No content comparison is needed as we assume
510 * the content length is zero.
511 */
512 return ie2[1];
513 case BSS_CMP_REGULAR:
514 default:
515 /* sort by length first, then by contents */
516 if (ie1[1] != ie2[1])
517 return ie2[1] - ie1[1];
518 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
519 case BSS_CMP_HIDE_NUL:
520 if (ie1[1] != ie2[1])
521 return ie2[1] - ie1[1];
522 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */
523 for (i = 0; i < ie2[1]; i++)
524 if (ie2[i + 2])
525 return -1;
526 return 0;
527 }
528 }
529
530 /* Returned bss is reference counted and must be cleaned up appropriately. */
531 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
532 struct ieee80211_channel *channel,
533 const u8 *bssid,
534 const u8 *ssid, size_t ssid_len,
535 u16 capa_mask, u16 capa_val)
536 {
537 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
538 struct cfg80211_internal_bss *bss, *res = NULL;
539 unsigned long now = jiffies;
540
541 trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, capa_mask,
542 capa_val);
543
544 spin_lock_bh(&rdev->bss_lock);
545
546 list_for_each_entry(bss, &rdev->bss_list, list) {
547 if ((bss->pub.capability & capa_mask) != capa_val)
548 continue;
549 if (channel && bss->pub.channel != channel)
550 continue;
551 if (!is_valid_ether_addr(bss->pub.bssid))
552 continue;
553 /* Don't get expired BSS structs */
554 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
555 !atomic_read(&bss->hold))
556 continue;
557 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
558 res = bss;
559 bss_ref_get(rdev, res);
560 break;
561 }
562 }
563
564 spin_unlock_bh(&rdev->bss_lock);
565 if (!res)
566 return NULL;
567 trace_cfg80211_return_bss(&res->pub);
568 return &res->pub;
569 }
570 EXPORT_SYMBOL(cfg80211_get_bss);
571
572 static void rb_insert_bss(struct cfg80211_registered_device *rdev,
573 struct cfg80211_internal_bss *bss)
574 {
575 struct rb_node **p = &rdev->bss_tree.rb_node;
576 struct rb_node *parent = NULL;
577 struct cfg80211_internal_bss *tbss;
578 int cmp;
579
580 while (*p) {
581 parent = *p;
582 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
583
584 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR);
585
586 if (WARN_ON(!cmp)) {
587 /* will sort of leak this BSS */
588 return;
589 }
590
591 if (cmp < 0)
592 p = &(*p)->rb_left;
593 else
594 p = &(*p)->rb_right;
595 }
596
597 rb_link_node(&bss->rbn, parent, p);
598 rb_insert_color(&bss->rbn, &rdev->bss_tree);
599 }
600
601 static struct cfg80211_internal_bss *
602 rb_find_bss(struct cfg80211_registered_device *rdev,
603 struct cfg80211_internal_bss *res,
604 enum bss_compare_mode mode)
605 {
606 struct rb_node *n = rdev->bss_tree.rb_node;
607 struct cfg80211_internal_bss *bss;
608 int r;
609
610 while (n) {
611 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
612 r = cmp_bss(&res->pub, &bss->pub, mode);
613
614 if (r == 0)
615 return bss;
616 else if (r < 0)
617 n = n->rb_left;
618 else
619 n = n->rb_right;
620 }
621
622 return NULL;
623 }
624
625 static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev,
626 struct cfg80211_internal_bss *new)
627 {
628 const struct cfg80211_bss_ies *ies;
629 struct cfg80211_internal_bss *bss;
630 const u8 *ie;
631 int i, ssidlen;
632 u8 fold = 0;
633
634 ies = rcu_access_pointer(new->pub.beacon_ies);
635 if (WARN_ON(!ies))
636 return false;
637
638 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
639 if (!ie) {
640 /* nothing to do */
641 return true;
642 }
643
644 ssidlen = ie[1];
645 for (i = 0; i < ssidlen; i++)
646 fold |= ie[2 + i];
647
648 if (fold) {
649 /* not a hidden SSID */
650 return true;
651 }
652
653 /* This is the bad part ... */
654
655 list_for_each_entry(bss, &rdev->bss_list, list) {
656 if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid))
657 continue;
658 if (bss->pub.channel != new->pub.channel)
659 continue;
660 if (bss->pub.scan_width != new->pub.scan_width)
661 continue;
662 if (rcu_access_pointer(bss->pub.beacon_ies))
663 continue;
664 ies = rcu_access_pointer(bss->pub.ies);
665 if (!ies)
666 continue;
667 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
668 if (!ie)
669 continue;
670 if (ssidlen && ie[1] != ssidlen)
671 continue;
672 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss))
673 continue;
674 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list)))
675 list_del(&bss->hidden_list);
676 /* combine them */
677 list_add(&bss->hidden_list, &new->hidden_list);
678 bss->pub.hidden_beacon_bss = &new->pub;
679 new->refcount += bss->refcount;
680 rcu_assign_pointer(bss->pub.beacon_ies,
681 new->pub.beacon_ies);
682 }
683
684 return true;
685 }
686
687 /* Returned bss is reference counted and must be cleaned up appropriately. */
688 static struct cfg80211_internal_bss *
689 cfg80211_bss_update(struct cfg80211_registered_device *rdev,
690 struct cfg80211_internal_bss *tmp,
691 bool signal_valid)
692 {
693 struct cfg80211_internal_bss *found = NULL;
694
695 if (WARN_ON(!tmp->pub.channel))
696 return NULL;
697
698 tmp->ts = jiffies;
699
700 spin_lock_bh(&rdev->bss_lock);
701
702 if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
703 spin_unlock_bh(&rdev->bss_lock);
704 return NULL;
705 }
706
707 found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR);
708
709 if (found) {
710 /* Update IEs */
711 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
712 const struct cfg80211_bss_ies *old;
713
714 old = rcu_access_pointer(found->pub.proberesp_ies);
715
716 rcu_assign_pointer(found->pub.proberesp_ies,
717 tmp->pub.proberesp_ies);
718 /* Override possible earlier Beacon frame IEs */
719 rcu_assign_pointer(found->pub.ies,
720 tmp->pub.proberesp_ies);
721 if (old)
722 kfree_rcu((struct cfg80211_bss_ies *)old,
723 rcu_head);
724 } else if (rcu_access_pointer(tmp->pub.beacon_ies)) {
725 const struct cfg80211_bss_ies *old;
726 struct cfg80211_internal_bss *bss;
727
728 if (found->pub.hidden_beacon_bss &&
729 !list_empty(&found->hidden_list)) {
730 const struct cfg80211_bss_ies *f;
731
732 /*
733 * The found BSS struct is one of the probe
734 * response members of a group, but we're
735 * receiving a beacon (beacon_ies in the tmp
736 * bss is used). This can only mean that the
737 * AP changed its beacon from not having an
738 * SSID to showing it, which is confusing so
739 * drop this information.
740 */
741
742 f = rcu_access_pointer(tmp->pub.beacon_ies);
743 kfree_rcu((struct cfg80211_bss_ies *)f,
744 rcu_head);
745 goto drop;
746 }
747
748 old = rcu_access_pointer(found->pub.beacon_ies);
749
750 rcu_assign_pointer(found->pub.beacon_ies,
751 tmp->pub.beacon_ies);
752
753 /* Override IEs if they were from a beacon before */
754 if (old == rcu_access_pointer(found->pub.ies))
755 rcu_assign_pointer(found->pub.ies,
756 tmp->pub.beacon_ies);
757
758 /* Assign beacon IEs to all sub entries */
759 list_for_each_entry(bss, &found->hidden_list,
760 hidden_list) {
761 const struct cfg80211_bss_ies *ies;
762
763 ies = rcu_access_pointer(bss->pub.beacon_ies);
764 WARN_ON(ies != old);
765
766 rcu_assign_pointer(bss->pub.beacon_ies,
767 tmp->pub.beacon_ies);
768 }
769
770 if (old)
771 kfree_rcu((struct cfg80211_bss_ies *)old,
772 rcu_head);
773 }
774
775 found->pub.beacon_interval = tmp->pub.beacon_interval;
776 /*
777 * don't update the signal if beacon was heard on
778 * adjacent channel.
779 */
780 if (signal_valid)
781 found->pub.signal = tmp->pub.signal;
782 found->pub.capability = tmp->pub.capability;
783 found->ts = tmp->ts;
784 } else {
785 struct cfg80211_internal_bss *new;
786 struct cfg80211_internal_bss *hidden;
787 struct cfg80211_bss_ies *ies;
788
789 /*
790 * create a copy -- the "res" variable that is passed in
791 * is allocated on the stack since it's not needed in the
792 * more common case of an update
793 */
794 new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size,
795 GFP_ATOMIC);
796 if (!new) {
797 ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
798 if (ies)
799 kfree_rcu(ies, rcu_head);
800 ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
801 if (ies)
802 kfree_rcu(ies, rcu_head);
803 goto drop;
804 }
805 memcpy(new, tmp, sizeof(*new));
806 new->refcount = 1;
807 INIT_LIST_HEAD(&new->hidden_list);
808
809 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
810 hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
811 if (!hidden)
812 hidden = rb_find_bss(rdev, tmp,
813 BSS_CMP_HIDE_NUL);
814 if (hidden) {
815 new->pub.hidden_beacon_bss = &hidden->pub;
816 list_add(&new->hidden_list,
817 &hidden->hidden_list);
818 hidden->refcount++;
819 rcu_assign_pointer(new->pub.beacon_ies,
820 hidden->pub.beacon_ies);
821 }
822 } else {
823 /*
824 * Ok so we found a beacon, and don't have an entry. If
825 * it's a beacon with hidden SSID, we might be in for an
826 * expensive search for any probe responses that should
827 * be grouped with this beacon for updates ...
828 */
829 if (!cfg80211_combine_bsses(rdev, new)) {
830 kfree(new);
831 goto drop;
832 }
833 }
834
835 list_add_tail(&new->list, &rdev->bss_list);
836 rb_insert_bss(rdev, new);
837 found = new;
838 }
839
840 rdev->bss_generation++;
841 bss_ref_get(rdev, found);
842 spin_unlock_bh(&rdev->bss_lock);
843
844 return found;
845 drop:
846 spin_unlock_bh(&rdev->bss_lock);
847 return NULL;
848 }
849
850 static struct ieee80211_channel *
851 cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
852 struct ieee80211_channel *channel)
853 {
854 const u8 *tmp;
855 u32 freq;
856 int channel_number = -1;
857
858 tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen);
859 if (tmp && tmp[1] == 1) {
860 channel_number = tmp[2];
861 } else {
862 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen);
863 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) {
864 struct ieee80211_ht_operation *htop = (void *)(tmp + 2);
865
866 channel_number = htop->primary_chan;
867 }
868 }
869
870 if (channel_number < 0)
871 return channel;
872
873 freq = ieee80211_channel_to_frequency(channel_number, channel->band);
874 channel = ieee80211_get_channel(wiphy, freq);
875 if (!channel)
876 return NULL;
877 if (channel->flags & IEEE80211_CHAN_DISABLED)
878 return NULL;
879 return channel;
880 }
881
882 /* Returned bss is reference counted and must be cleaned up appropriately. */
883 struct cfg80211_bss*
884 cfg80211_inform_bss_width(struct wiphy *wiphy,
885 struct ieee80211_channel *rx_channel,
886 enum nl80211_bss_scan_width scan_width,
887 enum cfg80211_bss_frame_type ftype,
888 const u8 *bssid, u64 tsf, u16 capability,
889 u16 beacon_interval, const u8 *ie, size_t ielen,
890 s32 signal, gfp_t gfp)
891 {
892 struct cfg80211_bss_ies *ies;
893 struct ieee80211_channel *channel;
894 struct cfg80211_internal_bss tmp = {}, *res;
895 bool signal_valid;
896
897 if (WARN_ON(!wiphy))
898 return NULL;
899
900 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
901 (signal < 0 || signal > 100)))
902 return NULL;
903
904 channel = cfg80211_get_bss_channel(wiphy, ie, ielen, rx_channel);
905 if (!channel)
906 return NULL;
907
908 memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
909 tmp.pub.channel = channel;
910 tmp.pub.scan_width = scan_width;
911 tmp.pub.signal = signal;
912 tmp.pub.beacon_interval = beacon_interval;
913 tmp.pub.capability = capability;
914 /*
915 * If we do not know here whether the IEs are from a Beacon or Probe
916 * Response frame, we need to pick one of the options and only use it
917 * with the driver that does not provide the full Beacon/Probe Response
918 * frame. Use Beacon frame pointer to avoid indicating that this should
919 * override the IEs pointer should we have received an earlier
920 * indication of Probe Response data.
921 */
922 ies = kzalloc(sizeof(*ies) + ielen, gfp);
923 if (!ies)
924 return NULL;
925 ies->len = ielen;
926 ies->tsf = tsf;
927 ies->from_beacon = false;
928 memcpy(ies->data, ie, ielen);
929
930 switch (ftype) {
931 case CFG80211_BSS_FTYPE_BEACON:
932 ies->from_beacon = true;
933 /* fall through to assign */
934 case CFG80211_BSS_FTYPE_UNKNOWN:
935 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
936 break;
937 case CFG80211_BSS_FTYPE_PRESP:
938 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
939 break;
940 }
941 rcu_assign_pointer(tmp.pub.ies, ies);
942
943 signal_valid = abs(rx_channel->center_freq - channel->center_freq) <=
944 wiphy->max_adj_channel_rssi_comp;
945 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
946 if (!res)
947 return NULL;
948
949 if (res->pub.capability & WLAN_CAPABILITY_ESS)
950 regulatory_hint_found_beacon(wiphy, channel, gfp);
951
952 trace_cfg80211_return_bss(&res->pub);
953 /* cfg80211_bss_update gives us a referenced result */
954 return &res->pub;
955 }
956 EXPORT_SYMBOL(cfg80211_inform_bss_width);
957
958 /* Returned bss is reference counted and must be cleaned up appropriately. */
959 struct cfg80211_bss *
960 cfg80211_inform_bss_width_frame(struct wiphy *wiphy,
961 struct ieee80211_channel *rx_channel,
962 enum nl80211_bss_scan_width scan_width,
963 struct ieee80211_mgmt *mgmt, size_t len,
964 s32 signal, gfp_t gfp)
965 {
966 struct cfg80211_internal_bss tmp = {}, *res;
967 struct cfg80211_bss_ies *ies;
968 struct ieee80211_channel *channel;
969 bool signal_valid;
970 size_t ielen = len - offsetof(struct ieee80211_mgmt,
971 u.probe_resp.variable);
972
973 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
974 offsetof(struct ieee80211_mgmt, u.beacon.variable));
975
976 trace_cfg80211_inform_bss_width_frame(wiphy, rx_channel, scan_width, mgmt,
977 len, signal);
978
979 if (WARN_ON(!mgmt))
980 return NULL;
981
982 if (WARN_ON(!wiphy))
983 return NULL;
984
985 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
986 (signal < 0 || signal > 100)))
987 return NULL;
988
989 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
990 return NULL;
991
992 channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable,
993 ielen, rx_channel);
994 if (!channel)
995 return NULL;
996
997 ies = kzalloc(sizeof(*ies) + ielen, gfp);
998 if (!ies)
999 return NULL;
1000 ies->len = ielen;
1001 ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
1002 ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
1003 memcpy(ies->data, mgmt->u.probe_resp.variable, ielen);
1004
1005 if (ieee80211_is_probe_resp(mgmt->frame_control))
1006 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1007 else
1008 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1009 rcu_assign_pointer(tmp.pub.ies, ies);
1010
1011 memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN);
1012 tmp.pub.channel = channel;
1013 tmp.pub.scan_width = scan_width;
1014 tmp.pub.signal = signal;
1015 tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
1016 tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
1017
1018 signal_valid = abs(rx_channel->center_freq - channel->center_freq) <=
1019 wiphy->max_adj_channel_rssi_comp;
1020 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
1021 if (!res)
1022 return NULL;
1023
1024 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1025 regulatory_hint_found_beacon(wiphy, channel, gfp);
1026
1027 trace_cfg80211_return_bss(&res->pub);
1028 /* cfg80211_bss_update gives us a referenced result */
1029 return &res->pub;
1030 }
1031 EXPORT_SYMBOL(cfg80211_inform_bss_width_frame);
1032
1033 void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1034 {
1035 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1036 struct cfg80211_internal_bss *bss;
1037
1038 if (!pub)
1039 return;
1040
1041 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1042
1043 spin_lock_bh(&rdev->bss_lock);
1044 bss_ref_get(rdev, bss);
1045 spin_unlock_bh(&rdev->bss_lock);
1046 }
1047 EXPORT_SYMBOL(cfg80211_ref_bss);
1048
1049 void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1050 {
1051 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1052 struct cfg80211_internal_bss *bss;
1053
1054 if (!pub)
1055 return;
1056
1057 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1058
1059 spin_lock_bh(&rdev->bss_lock);
1060 bss_ref_put(rdev, bss);
1061 spin_unlock_bh(&rdev->bss_lock);
1062 }
1063 EXPORT_SYMBOL(cfg80211_put_bss);
1064
1065 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1066 {
1067 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1068 struct cfg80211_internal_bss *bss;
1069
1070 if (WARN_ON(!pub))
1071 return;
1072
1073 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1074
1075 spin_lock_bh(&rdev->bss_lock);
1076 if (!list_empty(&bss->list)) {
1077 if (__cfg80211_unlink_bss(rdev, bss))
1078 rdev->bss_generation++;
1079 }
1080 spin_unlock_bh(&rdev->bss_lock);
1081 }
1082 EXPORT_SYMBOL(cfg80211_unlink_bss);
1083
1084 #ifdef CONFIG_CFG80211_WEXT
1085 static struct cfg80211_registered_device *
1086 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
1087 {
1088 struct cfg80211_registered_device *rdev;
1089 struct net_device *dev;
1090
1091 ASSERT_RTNL();
1092
1093 dev = dev_get_by_index(net, ifindex);
1094 if (!dev)
1095 return ERR_PTR(-ENODEV);
1096 if (dev->ieee80211_ptr)
1097 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
1098 else
1099 rdev = ERR_PTR(-ENODEV);
1100 dev_put(dev);
1101 return rdev;
1102 }
1103
1104 int cfg80211_wext_siwscan(struct net_device *dev,
1105 struct iw_request_info *info,
1106 union iwreq_data *wrqu, char *extra)
1107 {
1108 struct cfg80211_registered_device *rdev;
1109 struct wiphy *wiphy;
1110 struct iw_scan_req *wreq = NULL;
1111 struct cfg80211_scan_request *creq = NULL;
1112 int i, err, n_channels = 0;
1113 enum ieee80211_band band;
1114
1115 if (!netif_running(dev))
1116 return -ENETDOWN;
1117
1118 if (wrqu->data.length == sizeof(struct iw_scan_req))
1119 wreq = (struct iw_scan_req *)extra;
1120
1121 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1122
1123 if (IS_ERR(rdev))
1124 return PTR_ERR(rdev);
1125
1126 if (rdev->scan_req || rdev->scan_msg) {
1127 err = -EBUSY;
1128 goto out;
1129 }
1130
1131 wiphy = &rdev->wiphy;
1132
1133 /* Determine number of channels, needed to allocate creq */
1134 if (wreq && wreq->num_channels)
1135 n_channels = wreq->num_channels;
1136 else
1137 n_channels = ieee80211_get_num_supported_channels(wiphy);
1138
1139 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
1140 n_channels * sizeof(void *),
1141 GFP_ATOMIC);
1142 if (!creq) {
1143 err = -ENOMEM;
1144 goto out;
1145 }
1146
1147 creq->wiphy = wiphy;
1148 creq->wdev = dev->ieee80211_ptr;
1149 /* SSIDs come after channels */
1150 creq->ssids = (void *)&creq->channels[n_channels];
1151 creq->n_channels = n_channels;
1152 creq->n_ssids = 1;
1153 creq->scan_start = jiffies;
1154
1155 /* translate "Scan on frequencies" request */
1156 i = 0;
1157 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1158 int j;
1159
1160 if (!wiphy->bands[band])
1161 continue;
1162
1163 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
1164 /* ignore disabled channels */
1165 if (wiphy->bands[band]->channels[j].flags &
1166 IEEE80211_CHAN_DISABLED)
1167 continue;
1168
1169 /* If we have a wireless request structure and the
1170 * wireless request specifies frequencies, then search
1171 * for the matching hardware channel.
1172 */
1173 if (wreq && wreq->num_channels) {
1174 int k;
1175 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
1176 for (k = 0; k < wreq->num_channels; k++) {
1177 struct iw_freq *freq =
1178 &wreq->channel_list[k];
1179 int wext_freq =
1180 cfg80211_wext_freq(freq);
1181
1182 if (wext_freq == wiphy_freq)
1183 goto wext_freq_found;
1184 }
1185 goto wext_freq_not_found;
1186 }
1187
1188 wext_freq_found:
1189 creq->channels[i] = &wiphy->bands[band]->channels[j];
1190 i++;
1191 wext_freq_not_found: ;
1192 }
1193 }
1194 /* No channels found? */
1195 if (!i) {
1196 err = -EINVAL;
1197 goto out;
1198 }
1199
1200 /* Set real number of channels specified in creq->channels[] */
1201 creq->n_channels = i;
1202
1203 /* translate "Scan for SSID" request */
1204 if (wreq) {
1205 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
1206 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
1207 err = -EINVAL;
1208 goto out;
1209 }
1210 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
1211 creq->ssids[0].ssid_len = wreq->essid_len;
1212 }
1213 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
1214 creq->n_ssids = 0;
1215 }
1216
1217 for (i = 0; i < IEEE80211_NUM_BANDS; i++)
1218 if (wiphy->bands[i])
1219 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
1220
1221 rdev->scan_req = creq;
1222 err = rdev_scan(rdev, creq);
1223 if (err) {
1224 rdev->scan_req = NULL;
1225 /* creq will be freed below */
1226 } else {
1227 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
1228 /* creq now owned by driver */
1229 creq = NULL;
1230 dev_hold(dev);
1231 }
1232 out:
1233 kfree(creq);
1234 return err;
1235 }
1236 EXPORT_SYMBOL_GPL(cfg80211_wext_siwscan);
1237
1238 static void ieee80211_scan_add_ies(struct iw_request_info *info,
1239 const struct cfg80211_bss_ies *ies,
1240 char **current_ev, char *end_buf)
1241 {
1242 const u8 *pos, *end, *next;
1243 struct iw_event iwe;
1244
1245 if (!ies)
1246 return;
1247
1248 /*
1249 * If needed, fragment the IEs buffer (at IE boundaries) into short
1250 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
1251 */
1252 pos = ies->data;
1253 end = pos + ies->len;
1254
1255 while (end - pos > IW_GENERIC_IE_MAX) {
1256 next = pos + 2 + pos[1];
1257 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
1258 next = next + 2 + next[1];
1259
1260 memset(&iwe, 0, sizeof(iwe));
1261 iwe.cmd = IWEVGENIE;
1262 iwe.u.data.length = next - pos;
1263 *current_ev = iwe_stream_add_point(info, *current_ev,
1264 end_buf, &iwe,
1265 (void *)pos);
1266
1267 pos = next;
1268 }
1269
1270 if (end > pos) {
1271 memset(&iwe, 0, sizeof(iwe));
1272 iwe.cmd = IWEVGENIE;
1273 iwe.u.data.length = end - pos;
1274 *current_ev = iwe_stream_add_point(info, *current_ev,
1275 end_buf, &iwe,
1276 (void *)pos);
1277 }
1278 }
1279
1280 static char *
1281 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
1282 struct cfg80211_internal_bss *bss, char *current_ev,
1283 char *end_buf)
1284 {
1285 const struct cfg80211_bss_ies *ies;
1286 struct iw_event iwe;
1287 const u8 *ie;
1288 u8 *buf, *cfg, *p;
1289 int rem, i, sig;
1290 bool ismesh = false;
1291
1292 memset(&iwe, 0, sizeof(iwe));
1293 iwe.cmd = SIOCGIWAP;
1294 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1295 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
1296 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1297 IW_EV_ADDR_LEN);
1298
1299 memset(&iwe, 0, sizeof(iwe));
1300 iwe.cmd = SIOCGIWFREQ;
1301 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
1302 iwe.u.freq.e = 0;
1303 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1304 IW_EV_FREQ_LEN);
1305
1306 memset(&iwe, 0, sizeof(iwe));
1307 iwe.cmd = SIOCGIWFREQ;
1308 iwe.u.freq.m = bss->pub.channel->center_freq;
1309 iwe.u.freq.e = 6;
1310 current_ev = iwe_stream_add_event(info, current_ev, end_buf, &iwe,
1311 IW_EV_FREQ_LEN);
1312
1313 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
1314 memset(&iwe, 0, sizeof(iwe));
1315 iwe.cmd = IWEVQUAL;
1316 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
1317 IW_QUAL_NOISE_INVALID |
1318 IW_QUAL_QUAL_UPDATED;
1319 switch (wiphy->signal_type) {
1320 case CFG80211_SIGNAL_TYPE_MBM:
1321 sig = bss->pub.signal / 100;
1322 iwe.u.qual.level = sig;
1323 iwe.u.qual.updated |= IW_QUAL_DBM;
1324 if (sig < -110) /* rather bad */
1325 sig = -110;
1326 else if (sig > -40) /* perfect */
1327 sig = -40;
1328 /* will give a range of 0 .. 70 */
1329 iwe.u.qual.qual = sig + 110;
1330 break;
1331 case CFG80211_SIGNAL_TYPE_UNSPEC:
1332 iwe.u.qual.level = bss->pub.signal;
1333 /* will give range 0 .. 100 */
1334 iwe.u.qual.qual = bss->pub.signal;
1335 break;
1336 default:
1337 /* not reached */
1338 break;
1339 }
1340 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1341 &iwe, IW_EV_QUAL_LEN);
1342 }
1343
1344 memset(&iwe, 0, sizeof(iwe));
1345 iwe.cmd = SIOCGIWENCODE;
1346 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
1347 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1348 else
1349 iwe.u.data.flags = IW_ENCODE_DISABLED;
1350 iwe.u.data.length = 0;
1351 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1352 &iwe, "");
1353
1354 rcu_read_lock();
1355 ies = rcu_dereference(bss->pub.ies);
1356 rem = ies->len;
1357 ie = ies->data;
1358
1359 while (rem >= 2) {
1360 /* invalid data */
1361 if (ie[1] > rem - 2)
1362 break;
1363
1364 switch (ie[0]) {
1365 case WLAN_EID_SSID:
1366 memset(&iwe, 0, sizeof(iwe));
1367 iwe.cmd = SIOCGIWESSID;
1368 iwe.u.data.length = ie[1];
1369 iwe.u.data.flags = 1;
1370 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1371 &iwe, (u8 *)ie + 2);
1372 break;
1373 case WLAN_EID_MESH_ID:
1374 memset(&iwe, 0, sizeof(iwe));
1375 iwe.cmd = SIOCGIWESSID;
1376 iwe.u.data.length = ie[1];
1377 iwe.u.data.flags = 1;
1378 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1379 &iwe, (u8 *)ie + 2);
1380 break;
1381 case WLAN_EID_MESH_CONFIG:
1382 ismesh = true;
1383 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
1384 break;
1385 buf = kmalloc(50, GFP_ATOMIC);
1386 if (!buf)
1387 break;
1388 cfg = (u8 *)ie + 2;
1389 memset(&iwe, 0, sizeof(iwe));
1390 iwe.cmd = IWEVCUSTOM;
1391 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
1392 "0x%02X", cfg[0]);
1393 iwe.u.data.length = strlen(buf);
1394 current_ev = iwe_stream_add_point(info, current_ev,
1395 end_buf,
1396 &iwe, buf);
1397 sprintf(buf, "Path Selection Metric ID: 0x%02X",
1398 cfg[1]);
1399 iwe.u.data.length = strlen(buf);
1400 current_ev = iwe_stream_add_point(info, current_ev,
1401 end_buf,
1402 &iwe, buf);
1403 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
1404 cfg[2]);
1405 iwe.u.data.length = strlen(buf);
1406 current_ev = iwe_stream_add_point(info, current_ev,
1407 end_buf,
1408 &iwe, buf);
1409 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
1410 iwe.u.data.length = strlen(buf);
1411 current_ev = iwe_stream_add_point(info, current_ev,
1412 end_buf,
1413 &iwe, buf);
1414 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
1415 iwe.u.data.length = strlen(buf);
1416 current_ev = iwe_stream_add_point(info, current_ev,
1417 end_buf,
1418 &iwe, buf);
1419 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
1420 iwe.u.data.length = strlen(buf);
1421 current_ev = iwe_stream_add_point(info, current_ev,
1422 end_buf,
1423 &iwe, buf);
1424 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
1425 iwe.u.data.length = strlen(buf);
1426 current_ev = iwe_stream_add_point(info, current_ev,
1427 end_buf,
1428 &iwe, buf);
1429 kfree(buf);
1430 break;
1431 case WLAN_EID_SUPP_RATES:
1432 case WLAN_EID_EXT_SUPP_RATES:
1433 /* display all supported rates in readable format */
1434 p = current_ev + iwe_stream_lcp_len(info);
1435
1436 memset(&iwe, 0, sizeof(iwe));
1437 iwe.cmd = SIOCGIWRATE;
1438 /* Those two flags are ignored... */
1439 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
1440
1441 for (i = 0; i < ie[1]; i++) {
1442 iwe.u.bitrate.value =
1443 ((ie[i + 2] & 0x7f) * 500000);
1444 p = iwe_stream_add_value(info, current_ev, p,
1445 end_buf, &iwe, IW_EV_PARAM_LEN);
1446 }
1447 current_ev = p;
1448 break;
1449 }
1450 rem -= ie[1] + 2;
1451 ie += ie[1] + 2;
1452 }
1453
1454 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
1455 ismesh) {
1456 memset(&iwe, 0, sizeof(iwe));
1457 iwe.cmd = SIOCGIWMODE;
1458 if (ismesh)
1459 iwe.u.mode = IW_MODE_MESH;
1460 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
1461 iwe.u.mode = IW_MODE_MASTER;
1462 else
1463 iwe.u.mode = IW_MODE_ADHOC;
1464 current_ev = iwe_stream_add_event(info, current_ev, end_buf,
1465 &iwe, IW_EV_UINT_LEN);
1466 }
1467
1468 buf = kmalloc(31, GFP_ATOMIC);
1469 if (buf) {
1470 memset(&iwe, 0, sizeof(iwe));
1471 iwe.cmd = IWEVCUSTOM;
1472 sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
1473 iwe.u.data.length = strlen(buf);
1474 current_ev = iwe_stream_add_point(info, current_ev, end_buf,
1475 &iwe, buf);
1476 memset(&iwe, 0, sizeof(iwe));
1477 iwe.cmd = IWEVCUSTOM;
1478 sprintf(buf, " Last beacon: %ums ago",
1479 elapsed_jiffies_msecs(bss->ts));
1480 iwe.u.data.length = strlen(buf);
1481 current_ev = iwe_stream_add_point(info, current_ev,
1482 end_buf, &iwe, buf);
1483 kfree(buf);
1484 }
1485
1486 ieee80211_scan_add_ies(info, ies, &current_ev, end_buf);
1487 rcu_read_unlock();
1488
1489 return current_ev;
1490 }
1491
1492
1493 static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
1494 struct iw_request_info *info,
1495 char *buf, size_t len)
1496 {
1497 char *current_ev = buf;
1498 char *end_buf = buf + len;
1499 struct cfg80211_internal_bss *bss;
1500
1501 spin_lock_bh(&rdev->bss_lock);
1502 cfg80211_bss_expire(rdev);
1503
1504 list_for_each_entry(bss, &rdev->bss_list, list) {
1505 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
1506 spin_unlock_bh(&rdev->bss_lock);
1507 return -E2BIG;
1508 }
1509 current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
1510 current_ev, end_buf);
1511 }
1512 spin_unlock_bh(&rdev->bss_lock);
1513 return current_ev - buf;
1514 }
1515
1516
1517 int cfg80211_wext_giwscan(struct net_device *dev,
1518 struct iw_request_info *info,
1519 struct iw_point *data, char *extra)
1520 {
1521 struct cfg80211_registered_device *rdev;
1522 int res;
1523
1524 if (!netif_running(dev))
1525 return -ENETDOWN;
1526
1527 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1528
1529 if (IS_ERR(rdev))
1530 return PTR_ERR(rdev);
1531
1532 if (rdev->scan_req || rdev->scan_msg)
1533 return -EAGAIN;
1534
1535 res = ieee80211_scan_results(rdev, info, extra, data->length);
1536 data->length = 0;
1537 if (res >= 0) {
1538 data->length = res;
1539 res = 0;
1540 }
1541
1542 return res;
1543 }
1544 EXPORT_SYMBOL_GPL(cfg80211_wext_giwscan);
1545 #endif
Linux kernel - Deliverables
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