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Merge tag 'iio-fixes-for-4.1a-take2' of git://git.kernel.org/pub/scm/linux/kernel...
[deliverable/linux.git] / net / wireless / scan.c
1 /*
2 * cfg80211 scan result handling
3 *
4 * Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
5 * Copyright 2013-2014 Intel Mobile Communications GmbH
6 */
7 #include <linux/kernel.h>
8 #include <linux/slab.h>
9 #include <linux/module.h>
10 #include <linux/netdevice.h>
11 #include <linux/wireless.h>
12 #include <linux/nl80211.h>
13 #include <linux/etherdevice.h>
14 #include <net/arp.h>
15 #include <net/cfg80211.h>
16 #include <net/cfg80211-wext.h>
17 #include <net/iw_handler.h>
18 #include "core.h"
19 #include "nl80211.h"
20 #include "wext-compat.h"
21 #include "rdev-ops.h"
22
23 /**
24 * DOC: BSS tree/list structure
25 *
26 * At the top level, the BSS list is kept in both a list in each
27 * registered device (@bss_list) as well as an RB-tree for faster
28 * lookup. In the RB-tree, entries can be looked up using their
29 * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID
30 * for other BSSes.
31 *
32 * Due to the possibility of hidden SSIDs, there's a second level
33 * structure, the "hidden_list" and "hidden_beacon_bss" pointer.
34 * The hidden_list connects all BSSes belonging to a single AP
35 * that has a hidden SSID, and connects beacon and probe response
36 * entries. For a probe response entry for a hidden SSID, the
37 * hidden_beacon_bss pointer points to the BSS struct holding the
38 * beacon's information.
39 *
40 * Reference counting is done for all these references except for
41 * the hidden_list, so that a beacon BSS struct that is otherwise
42 * not referenced has one reference for being on the bss_list and
43 * one for each probe response entry that points to it using the
44 * hidden_beacon_bss pointer. When a BSS struct that has such a
45 * pointer is get/put, the refcount update is also propagated to
46 * the referenced struct, this ensure that it cannot get removed
47 * while somebody is using the probe response version.
48 *
49 * Note that the hidden_beacon_bss pointer never changes, due to
50 * the reference counting. Therefore, no locking is needed for
51 * it.
52 *
53 * Also note that the hidden_beacon_bss pointer is only relevant
54 * if the driver uses something other than the IEs, e.g. private
55 * data stored stored in the BSS struct, since the beacon IEs are
56 * also linked into the probe response struct.
57 */
58
59 #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ)
60
61 static void bss_free(struct cfg80211_internal_bss *bss)
62 {
63 struct cfg80211_bss_ies *ies;
64
65 if (WARN_ON(atomic_read(&bss->hold)))
66 return;
67
68 ies = (void *)rcu_access_pointer(bss->pub.beacon_ies);
69 if (ies && !bss->pub.hidden_beacon_bss)
70 kfree_rcu(ies, rcu_head);
71 ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies);
72 if (ies)
73 kfree_rcu(ies, rcu_head);
74
75 /*
76 * This happens when the module is removed, it doesn't
77 * really matter any more save for completeness
78 */
79 if (!list_empty(&bss->hidden_list))
80 list_del(&bss->hidden_list);
81
82 kfree(bss);
83 }
84
85 static inline void bss_ref_get(struct cfg80211_registered_device *rdev,
86 struct cfg80211_internal_bss *bss)
87 {
88 lockdep_assert_held(&rdev->bss_lock);
89
90 bss->refcount++;
91 if (bss->pub.hidden_beacon_bss) {
92 bss = container_of(bss->pub.hidden_beacon_bss,
93 struct cfg80211_internal_bss,
94 pub);
95 bss->refcount++;
96 }
97 }
98
99 static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
100 struct cfg80211_internal_bss *bss)
101 {
102 lockdep_assert_held(&rdev->bss_lock);
103
104 if (bss->pub.hidden_beacon_bss) {
105 struct cfg80211_internal_bss *hbss;
106 hbss = container_of(bss->pub.hidden_beacon_bss,
107 struct cfg80211_internal_bss,
108 pub);
109 hbss->refcount--;
110 if (hbss->refcount == 0)
111 bss_free(hbss);
112 }
113 bss->refcount--;
114 if (bss->refcount == 0)
115 bss_free(bss);
116 }
117
118 static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev,
119 struct cfg80211_internal_bss *bss)
120 {
121 lockdep_assert_held(&rdev->bss_lock);
122
123 if (!list_empty(&bss->hidden_list)) {
124 /*
125 * don't remove the beacon entry if it has
126 * probe responses associated with it
127 */
128 if (!bss->pub.hidden_beacon_bss)
129 return false;
130 /*
131 * if it's a probe response entry break its
132 * link to the other entries in the group
133 */
134 list_del_init(&bss->hidden_list);
135 }
136
137 list_del_init(&bss->list);
138 rb_erase(&bss->rbn, &rdev->bss_tree);
139 bss_ref_put(rdev, bss);
140 return true;
141 }
142
143 static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev,
144 unsigned long expire_time)
145 {
146 struct cfg80211_internal_bss *bss, *tmp;
147 bool expired = false;
148
149 lockdep_assert_held(&rdev->bss_lock);
150
151 list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) {
152 if (atomic_read(&bss->hold))
153 continue;
154 if (!time_after(expire_time, bss->ts))
155 continue;
156
157 if (__cfg80211_unlink_bss(rdev, bss))
158 expired = true;
159 }
160
161 if (expired)
162 rdev->bss_generation++;
163 }
164
165 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
166 bool send_message)
167 {
168 struct cfg80211_scan_request *request;
169 struct wireless_dev *wdev;
170 struct sk_buff *msg;
171 #ifdef CONFIG_CFG80211_WEXT
172 union iwreq_data wrqu;
173 #endif
174
175 ASSERT_RTNL();
176
177 if (rdev->scan_msg) {
178 nl80211_send_scan_result(rdev, rdev->scan_msg);
179 rdev->scan_msg = NULL;
180 return;
181 }
182
183 request = rdev->scan_req;
184 if (!request)
185 return;
186
187 wdev = request->wdev;
188
189 /*
190 * This must be before sending the other events!
191 * Otherwise, wpa_supplicant gets completely confused with
192 * wext events.
193 */
194 if (wdev->netdev)
195 cfg80211_sme_scan_done(wdev->netdev);
196
197 if (!request->aborted &&
198 request->flags & NL80211_SCAN_FLAG_FLUSH) {
199 /* flush entries from previous scans */
200 spin_lock_bh(&rdev->bss_lock);
201 __cfg80211_bss_expire(rdev, request->scan_start);
202 spin_unlock_bh(&rdev->bss_lock);
203 }
204
205 msg = nl80211_build_scan_msg(rdev, wdev, request->aborted);
206
207 #ifdef CONFIG_CFG80211_WEXT
208 if (wdev->netdev && !request->aborted) {
209 memset(&wrqu, 0, sizeof(wrqu));
210
211 wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
212 }
213 #endif
214
215 if (wdev->netdev)
216 dev_put(wdev->netdev);
217
218 rdev->scan_req = NULL;
219 kfree(request);
220
221 if (!send_message)
222 rdev->scan_msg = msg;
223 else
224 nl80211_send_scan_result(rdev, msg);
225 }
226
227 void __cfg80211_scan_done(struct work_struct *wk)
228 {
229 struct cfg80211_registered_device *rdev;
230
231 rdev = container_of(wk, struct cfg80211_registered_device,
232 scan_done_wk);
233
234 rtnl_lock();
235 ___cfg80211_scan_done(rdev, true);
236 rtnl_unlock();
237 }
238
239 void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
240 {
241 trace_cfg80211_scan_done(request, aborted);
242 WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req);
243
244 request->aborted = aborted;
245 request->notified = true;
246 queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk);
247 }
248 EXPORT_SYMBOL(cfg80211_scan_done);
249
250 void __cfg80211_sched_scan_results(struct work_struct *wk)
251 {
252 struct cfg80211_registered_device *rdev;
253 struct cfg80211_sched_scan_request *request;
254
255 rdev = container_of(wk, struct cfg80211_registered_device,
256 sched_scan_results_wk);
257
258 rtnl_lock();
259
260 request = rtnl_dereference(rdev->sched_scan_req);
261
262 /* we don't have sched_scan_req anymore if the scan is stopping */
263 if (request) {
264 if (request->flags & NL80211_SCAN_FLAG_FLUSH) {
265 /* flush entries from previous scans */
266 spin_lock_bh(&rdev->bss_lock);
267 __cfg80211_bss_expire(rdev, request->scan_start);
268 spin_unlock_bh(&rdev->bss_lock);
269 request->scan_start =
270 jiffies + msecs_to_jiffies(request->interval);
271 }
272 nl80211_send_sched_scan_results(rdev, request->dev);
273 }
274
275 rtnl_unlock();
276 }
277
278 void cfg80211_sched_scan_results(struct wiphy *wiphy)
279 {
280 trace_cfg80211_sched_scan_results(wiphy);
281 /* ignore if we're not scanning */
282
283 if (rcu_access_pointer(wiphy_to_rdev(wiphy)->sched_scan_req))
284 queue_work(cfg80211_wq,
285 &wiphy_to_rdev(wiphy)->sched_scan_results_wk);
286 }
287 EXPORT_SYMBOL(cfg80211_sched_scan_results);
288
289 void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy)
290 {
291 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
292
293 ASSERT_RTNL();
294
295 trace_cfg80211_sched_scan_stopped(wiphy);
296
297 __cfg80211_stop_sched_scan(rdev, true);
298 }
299 EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl);
300
301 void cfg80211_sched_scan_stopped(struct wiphy *wiphy)
302 {
303 rtnl_lock();
304 cfg80211_sched_scan_stopped_rtnl(wiphy);
305 rtnl_unlock();
306 }
307 EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
308
309 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
310 bool driver_initiated)
311 {
312 struct cfg80211_sched_scan_request *sched_scan_req;
313 struct net_device *dev;
314
315 ASSERT_RTNL();
316
317 if (!rdev->sched_scan_req)
318 return -ENOENT;
319
320 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
321 dev = sched_scan_req->dev;
322
323 if (!driver_initiated) {
324 int err = rdev_sched_scan_stop(rdev, dev);
325 if (err)
326 return err;
327 }
328
329 nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED);
330
331 RCU_INIT_POINTER(rdev->sched_scan_req, NULL);
332 kfree_rcu(sched_scan_req, rcu_head);
333
334 return 0;
335 }
336
337 void cfg80211_bss_age(struct cfg80211_registered_device *rdev,
338 unsigned long age_secs)
339 {
340 struct cfg80211_internal_bss *bss;
341 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
342
343 spin_lock_bh(&rdev->bss_lock);
344 list_for_each_entry(bss, &rdev->bss_list, list)
345 bss->ts -= age_jiffies;
346 spin_unlock_bh(&rdev->bss_lock);
347 }
348
349 void cfg80211_bss_expire(struct cfg80211_registered_device *rdev)
350 {
351 __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
352 }
353
354 const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len)
355 {
356 while (len > 2 && ies[0] != eid) {
357 len -= ies[1] + 2;
358 ies += ies[1] + 2;
359 }
360 if (len < 2)
361 return NULL;
362 if (len < 2 + ies[1])
363 return NULL;
364 return ies;
365 }
366 EXPORT_SYMBOL(cfg80211_find_ie);
367
368 const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type,
369 const u8 *ies, int len)
370 {
371 struct ieee80211_vendor_ie *ie;
372 const u8 *pos = ies, *end = ies + len;
373 int ie_oui;
374
375 while (pos < end) {
376 pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos,
377 end - pos);
378 if (!pos)
379 return NULL;
380
381 ie = (struct ieee80211_vendor_ie *)pos;
382
383 /* make sure we can access ie->len */
384 BUILD_BUG_ON(offsetof(struct ieee80211_vendor_ie, len) != 1);
385
386 if (ie->len < sizeof(*ie))
387 goto cont;
388
389 ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2];
390 if (ie_oui == oui && ie->oui_type == oui_type)
391 return pos;
392 cont:
393 pos += 2 + ie->len;
394 }
395 return NULL;
396 }
397 EXPORT_SYMBOL(cfg80211_find_vendor_ie);
398
399 static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
400 const u8 *ssid, size_t ssid_len)
401 {
402 const struct cfg80211_bss_ies *ies;
403 const u8 *ssidie;
404
405 if (bssid && !ether_addr_equal(a->bssid, bssid))
406 return false;
407
408 if (!ssid)
409 return true;
410
411 ies = rcu_access_pointer(a->ies);
412 if (!ies)
413 return false;
414 ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
415 if (!ssidie)
416 return false;
417 if (ssidie[1] != ssid_len)
418 return false;
419 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
420 }
421
422 /**
423 * enum bss_compare_mode - BSS compare mode
424 * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
425 * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
426 * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
427 */
428 enum bss_compare_mode {
429 BSS_CMP_REGULAR,
430 BSS_CMP_HIDE_ZLEN,
431 BSS_CMP_HIDE_NUL,
432 };
433
434 static int cmp_bss(struct cfg80211_bss *a,
435 struct cfg80211_bss *b,
436 enum bss_compare_mode mode)
437 {
438 const struct cfg80211_bss_ies *a_ies, *b_ies;
439 const u8 *ie1 = NULL;
440 const u8 *ie2 = NULL;
441 int i, r;
442
443 if (a->channel != b->channel)
444 return b->channel->center_freq - a->channel->center_freq;
445
446 a_ies = rcu_access_pointer(a->ies);
447 if (!a_ies)
448 return -1;
449 b_ies = rcu_access_pointer(b->ies);
450 if (!b_ies)
451 return 1;
452
453 if (WLAN_CAPABILITY_IS_STA_BSS(a->capability))
454 ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID,
455 a_ies->data, a_ies->len);
456 if (WLAN_CAPABILITY_IS_STA_BSS(b->capability))
457 ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID,
458 b_ies->data, b_ies->len);
459 if (ie1 && ie2) {
460 int mesh_id_cmp;
461
462 if (ie1[1] == ie2[1])
463 mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]);
464 else
465 mesh_id_cmp = ie2[1] - ie1[1];
466
467 ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
468 a_ies->data, a_ies->len);
469 ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
470 b_ies->data, b_ies->len);
471 if (ie1 && ie2) {
472 if (mesh_id_cmp)
473 return mesh_id_cmp;
474 if (ie1[1] != ie2[1])
475 return ie2[1] - ie1[1];
476 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
477 }
478 }
479
480 r = memcmp(a->bssid, b->bssid, sizeof(a->bssid));
481 if (r)
482 return r;
483
484 ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
485 ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
486
487 if (!ie1 && !ie2)
488 return 0;
489
490 /*
491 * Note that with "hide_ssid", the function returns a match if
492 * the already-present BSS ("b") is a hidden SSID beacon for
493 * the new BSS ("a").
494 */
495
496 /* sort missing IE before (left of) present IE */
497 if (!ie1)
498 return -1;
499 if (!ie2)
500 return 1;
501
502 switch (mode) {
503 case BSS_CMP_HIDE_ZLEN:
504 /*
505 * In ZLEN mode we assume the BSS entry we're
506 * looking for has a zero-length SSID. So if
507 * the one we're looking at right now has that,
508 * return 0. Otherwise, return the difference
509 * in length, but since we're looking for the
510 * 0-length it's really equivalent to returning
511 * the length of the one we're looking at.
512 *
513 * No content comparison is needed as we assume
514 * the content length is zero.
515 */
516 return ie2[1];
517 case BSS_CMP_REGULAR:
518 default:
519 /* sort by length first, then by contents */
520 if (ie1[1] != ie2[1])
521 return ie2[1] - ie1[1];
522 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
523 case BSS_CMP_HIDE_NUL:
524 if (ie1[1] != ie2[1])
525 return ie2[1] - ie1[1];
526 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */
527 for (i = 0; i < ie2[1]; i++)
528 if (ie2[i + 2])
529 return -1;
530 return 0;
531 }
532 }
533
534 static bool cfg80211_bss_type_match(u16 capability,
535 enum ieee80211_band band,
536 enum ieee80211_bss_type bss_type)
537 {
538 bool ret = true;
539 u16 mask, val;
540
541 if (bss_type == IEEE80211_BSS_TYPE_ANY)
542 return ret;
543
544 if (band == IEEE80211_BAND_60GHZ) {
545 mask = WLAN_CAPABILITY_DMG_TYPE_MASK;
546 switch (bss_type) {
547 case IEEE80211_BSS_TYPE_ESS:
548 val = WLAN_CAPABILITY_DMG_TYPE_AP;
549 break;
550 case IEEE80211_BSS_TYPE_PBSS:
551 val = WLAN_CAPABILITY_DMG_TYPE_PBSS;
552 break;
553 case IEEE80211_BSS_TYPE_IBSS:
554 val = WLAN_CAPABILITY_DMG_TYPE_IBSS;
555 break;
556 default:
557 return false;
558 }
559 } else {
560 mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS;
561 switch (bss_type) {
562 case IEEE80211_BSS_TYPE_ESS:
563 val = WLAN_CAPABILITY_ESS;
564 break;
565 case IEEE80211_BSS_TYPE_IBSS:
566 val = WLAN_CAPABILITY_IBSS;
567 break;
568 case IEEE80211_BSS_TYPE_MBSS:
569 val = 0;
570 break;
571 default:
572 return false;
573 }
574 }
575
576 ret = ((capability & mask) == val);
577 return ret;
578 }
579
580 /* Returned bss is reference counted and must be cleaned up appropriately. */
581 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
582 struct ieee80211_channel *channel,
583 const u8 *bssid,
584 const u8 *ssid, size_t ssid_len,
585 enum ieee80211_bss_type bss_type,
586 enum ieee80211_privacy privacy)
587 {
588 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
589 struct cfg80211_internal_bss *bss, *res = NULL;
590 unsigned long now = jiffies;
591 int bss_privacy;
592
593 trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type,
594 privacy);
595
596 spin_lock_bh(&rdev->bss_lock);
597
598 list_for_each_entry(bss, &rdev->bss_list, list) {
599 if (!cfg80211_bss_type_match(bss->pub.capability,
600 bss->pub.channel->band, bss_type))
601 continue;
602
603 bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY);
604 if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) ||
605 (privacy == IEEE80211_PRIVACY_OFF && bss_privacy))
606 continue;
607 if (channel && bss->pub.channel != channel)
608 continue;
609 if (!is_valid_ether_addr(bss->pub.bssid))
610 continue;
611 /* Don't get expired BSS structs */
612 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
613 !atomic_read(&bss->hold))
614 continue;
615 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
616 res = bss;
617 bss_ref_get(rdev, res);
618 break;
619 }
620 }
621
622 spin_unlock_bh(&rdev->bss_lock);
623 if (!res)
624 return NULL;
625 trace_cfg80211_return_bss(&res->pub);
626 return &res->pub;
627 }
628 EXPORT_SYMBOL(cfg80211_get_bss);
629
630 static void rb_insert_bss(struct cfg80211_registered_device *rdev,
631 struct cfg80211_internal_bss *bss)
632 {
633 struct rb_node **p = &rdev->bss_tree.rb_node;
634 struct rb_node *parent = NULL;
635 struct cfg80211_internal_bss *tbss;
636 int cmp;
637
638 while (*p) {
639 parent = *p;
640 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
641
642 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR);
643
644 if (WARN_ON(!cmp)) {
645 /* will sort of leak this BSS */
646 return;
647 }
648
649 if (cmp < 0)
650 p = &(*p)->rb_left;
651 else
652 p = &(*p)->rb_right;
653 }
654
655 rb_link_node(&bss->rbn, parent, p);
656 rb_insert_color(&bss->rbn, &rdev->bss_tree);
657 }
658
659 static struct cfg80211_internal_bss *
660 rb_find_bss(struct cfg80211_registered_device *rdev,
661 struct cfg80211_internal_bss *res,
662 enum bss_compare_mode mode)
663 {
664 struct rb_node *n = rdev->bss_tree.rb_node;
665 struct cfg80211_internal_bss *bss;
666 int r;
667
668 while (n) {
669 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
670 r = cmp_bss(&res->pub, &bss->pub, mode);
671
672 if (r == 0)
673 return bss;
674 else if (r < 0)
675 n = n->rb_left;
676 else
677 n = n->rb_right;
678 }
679
680 return NULL;
681 }
682
683 static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev,
684 struct cfg80211_internal_bss *new)
685 {
686 const struct cfg80211_bss_ies *ies;
687 struct cfg80211_internal_bss *bss;
688 const u8 *ie;
689 int i, ssidlen;
690 u8 fold = 0;
691
692 ies = rcu_access_pointer(new->pub.beacon_ies);
693 if (WARN_ON(!ies))
694 return false;
695
696 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
697 if (!ie) {
698 /* nothing to do */
699 return true;
700 }
701
702 ssidlen = ie[1];
703 for (i = 0; i < ssidlen; i++)
704 fold |= ie[2 + i];
705
706 if (fold) {
707 /* not a hidden SSID */
708 return true;
709 }
710
711 /* This is the bad part ... */
712
713 list_for_each_entry(bss, &rdev->bss_list, list) {
714 if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid))
715 continue;
716 if (bss->pub.channel != new->pub.channel)
717 continue;
718 if (bss->pub.scan_width != new->pub.scan_width)
719 continue;
720 if (rcu_access_pointer(bss->pub.beacon_ies))
721 continue;
722 ies = rcu_access_pointer(bss->pub.ies);
723 if (!ies)
724 continue;
725 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
726 if (!ie)
727 continue;
728 if (ssidlen && ie[1] != ssidlen)
729 continue;
730 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss))
731 continue;
732 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list)))
733 list_del(&bss->hidden_list);
734 /* combine them */
735 list_add(&bss->hidden_list, &new->hidden_list);
736 bss->pub.hidden_beacon_bss = &new->pub;
737 new->refcount += bss->refcount;
738 rcu_assign_pointer(bss->pub.beacon_ies,
739 new->pub.beacon_ies);
740 }
741
742 return true;
743 }
744
745 /* Returned bss is reference counted and must be cleaned up appropriately. */
746 static struct cfg80211_internal_bss *
747 cfg80211_bss_update(struct cfg80211_registered_device *rdev,
748 struct cfg80211_internal_bss *tmp,
749 bool signal_valid)
750 {
751 struct cfg80211_internal_bss *found = NULL;
752
753 if (WARN_ON(!tmp->pub.channel))
754 return NULL;
755
756 tmp->ts = jiffies;
757
758 spin_lock_bh(&rdev->bss_lock);
759
760 if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
761 spin_unlock_bh(&rdev->bss_lock);
762 return NULL;
763 }
764
765 found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR);
766
767 if (found) {
768 /* Update IEs */
769 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
770 const struct cfg80211_bss_ies *old;
771
772 old = rcu_access_pointer(found->pub.proberesp_ies);
773
774 rcu_assign_pointer(found->pub.proberesp_ies,
775 tmp->pub.proberesp_ies);
776 /* Override possible earlier Beacon frame IEs */
777 rcu_assign_pointer(found->pub.ies,
778 tmp->pub.proberesp_ies);
779 if (old)
780 kfree_rcu((struct cfg80211_bss_ies *)old,
781 rcu_head);
782 } else if (rcu_access_pointer(tmp->pub.beacon_ies)) {
783 const struct cfg80211_bss_ies *old;
784 struct cfg80211_internal_bss *bss;
785
786 if (found->pub.hidden_beacon_bss &&
787 !list_empty(&found->hidden_list)) {
788 const struct cfg80211_bss_ies *f;
789
790 /*
791 * The found BSS struct is one of the probe
792 * response members of a group, but we're
793 * receiving a beacon (beacon_ies in the tmp
794 * bss is used). This can only mean that the
795 * AP changed its beacon from not having an
796 * SSID to showing it, which is confusing so
797 * drop this information.
798 */
799
800 f = rcu_access_pointer(tmp->pub.beacon_ies);
801 kfree_rcu((struct cfg80211_bss_ies *)f,
802 rcu_head);
803 goto drop;
804 }
805
806 old = rcu_access_pointer(found->pub.beacon_ies);
807
808 rcu_assign_pointer(found->pub.beacon_ies,
809 tmp->pub.beacon_ies);
810
811 /* Override IEs if they were from a beacon before */
812 if (old == rcu_access_pointer(found->pub.ies))
813 rcu_assign_pointer(found->pub.ies,
814 tmp->pub.beacon_ies);
815
816 /* Assign beacon IEs to all sub entries */
817 list_for_each_entry(bss, &found->hidden_list,
818 hidden_list) {
819 const struct cfg80211_bss_ies *ies;
820
821 ies = rcu_access_pointer(bss->pub.beacon_ies);
822 WARN_ON(ies != old);
823
824 rcu_assign_pointer(bss->pub.beacon_ies,
825 tmp->pub.beacon_ies);
826 }
827
828 if (old)
829 kfree_rcu((struct cfg80211_bss_ies *)old,
830 rcu_head);
831 }
832
833 found->pub.beacon_interval = tmp->pub.beacon_interval;
834 /*
835 * don't update the signal if beacon was heard on
836 * adjacent channel.
837 */
838 if (signal_valid)
839 found->pub.signal = tmp->pub.signal;
840 found->pub.capability = tmp->pub.capability;
841 found->ts = tmp->ts;
842 } else {
843 struct cfg80211_internal_bss *new;
844 struct cfg80211_internal_bss *hidden;
845 struct cfg80211_bss_ies *ies;
846
847 /*
848 * create a copy -- the "res" variable that is passed in
849 * is allocated on the stack since it's not needed in the
850 * more common case of an update
851 */
852 new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size,
853 GFP_ATOMIC);
854 if (!new) {
855 ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
856 if (ies)
857 kfree_rcu(ies, rcu_head);
858 ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
859 if (ies)
860 kfree_rcu(ies, rcu_head);
861 goto drop;
862 }
863 memcpy(new, tmp, sizeof(*new));
864 new->refcount = 1;
865 INIT_LIST_HEAD(&new->hidden_list);
866
867 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
868 hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
869 if (!hidden)
870 hidden = rb_find_bss(rdev, tmp,
871 BSS_CMP_HIDE_NUL);
872 if (hidden) {
873 new->pub.hidden_beacon_bss = &hidden->pub;
874 list_add(&new->hidden_list,
875 &hidden->hidden_list);
876 hidden->refcount++;
877 rcu_assign_pointer(new->pub.beacon_ies,
878 hidden->pub.beacon_ies);
879 }
880 } else {
881 /*
882 * Ok so we found a beacon, and don't have an entry. If
883 * it's a beacon with hidden SSID, we might be in for an
884 * expensive search for any probe responses that should
885 * be grouped with this beacon for updates ...
886 */
887 if (!cfg80211_combine_bsses(rdev, new)) {
888 kfree(new);
889 goto drop;
890 }
891 }
892
893 list_add_tail(&new->list, &rdev->bss_list);
894 rb_insert_bss(rdev, new);
895 found = new;
896 }
897
898 rdev->bss_generation++;
899 bss_ref_get(rdev, found);
900 spin_unlock_bh(&rdev->bss_lock);
901
902 return found;
903 drop:
904 spin_unlock_bh(&rdev->bss_lock);
905 return NULL;
906 }
907
908 static struct ieee80211_channel *
909 cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
910 struct ieee80211_channel *channel)
911 {
912 const u8 *tmp;
913 u32 freq;
914 int channel_number = -1;
915
916 tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen);
917 if (tmp && tmp[1] == 1) {
918 channel_number = tmp[2];
919 } else {
920 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen);
921 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) {
922 struct ieee80211_ht_operation *htop = (void *)(tmp + 2);
923
924 channel_number = htop->primary_chan;
925 }
926 }
927
928 if (channel_number < 0)
929 return channel;
930
931 freq = ieee80211_channel_to_frequency(channel_number, channel->band);
932 channel = ieee80211_get_channel(wiphy, freq);
933 if (!channel)
934 return NULL;
935 if (channel->flags & IEEE80211_CHAN_DISABLED)
936 return NULL;
937 return channel;
938 }
939
940 /* Returned bss is reference counted and must be cleaned up appropriately. */
941 struct cfg80211_bss*
942 cfg80211_inform_bss_width(struct wiphy *wiphy,
943 struct ieee80211_channel *rx_channel,
944 enum nl80211_bss_scan_width scan_width,
945 enum cfg80211_bss_frame_type ftype,
946 const u8 *bssid, u64 tsf, u16 capability,
947 u16 beacon_interval, const u8 *ie, size_t ielen,
948 s32 signal, gfp_t gfp)
949 {
950 struct cfg80211_bss_ies *ies;
951 struct ieee80211_channel *channel;
952 struct cfg80211_internal_bss tmp = {}, *res;
953 int bss_type;
954 bool signal_valid;
955
956 if (WARN_ON(!wiphy))
957 return NULL;
958
959 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
960 (signal < 0 || signal > 100)))
961 return NULL;
962
963 channel = cfg80211_get_bss_channel(wiphy, ie, ielen, rx_channel);
964 if (!channel)
965 return NULL;
966
967 memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
968 tmp.pub.channel = channel;
969 tmp.pub.scan_width = scan_width;
970 tmp.pub.signal = signal;
971 tmp.pub.beacon_interval = beacon_interval;
972 tmp.pub.capability = capability;
973 /*
974 * If we do not know here whether the IEs are from a Beacon or Probe
975 * Response frame, we need to pick one of the options and only use it
976 * with the driver that does not provide the full Beacon/Probe Response
977 * frame. Use Beacon frame pointer to avoid indicating that this should
978 * override the IEs pointer should we have received an earlier
979 * indication of Probe Response data.
980 */
981 ies = kzalloc(sizeof(*ies) + ielen, gfp);
982 if (!ies)
983 return NULL;
984 ies->len = ielen;
985 ies->tsf = tsf;
986 ies->from_beacon = false;
987 memcpy(ies->data, ie, ielen);
988
989 switch (ftype) {
990 case CFG80211_BSS_FTYPE_BEACON:
991 ies->from_beacon = true;
992 /* fall through to assign */
993 case CFG80211_BSS_FTYPE_UNKNOWN:
994 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
995 break;
996 case CFG80211_BSS_FTYPE_PRESP:
997 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
998 break;
999 }
1000 rcu_assign_pointer(tmp.pub.ies, ies);
1001
1002 signal_valid = abs(rx_channel->center_freq - channel->center_freq) <=
1003 wiphy->max_adj_channel_rssi_comp;
1004 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
1005 if (!res)
1006 return NULL;
1007
1008 if (channel->band == IEEE80211_BAND_60GHZ) {
1009 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1010 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1011 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1012 regulatory_hint_found_beacon(wiphy, channel, gfp);
1013 } else {
1014 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1015 regulatory_hint_found_beacon(wiphy, channel, gfp);
1016 }
1017
1018 trace_cfg80211_return_bss(&res->pub);
1019 /* cfg80211_bss_update gives us a referenced result */
1020 return &res->pub;
1021 }
1022 EXPORT_SYMBOL(cfg80211_inform_bss_width);
1023
1024 /* Returned bss is reference counted and must be cleaned up appropriately. */
1025 struct cfg80211_bss *
1026 cfg80211_inform_bss_width_frame(struct wiphy *wiphy,
1027 struct ieee80211_channel *rx_channel,
1028 enum nl80211_bss_scan_width scan_width,
1029 struct ieee80211_mgmt *mgmt, size_t len,
1030 s32 signal, gfp_t gfp)
1031 {
1032 struct cfg80211_internal_bss tmp = {}, *res;
1033 struct cfg80211_bss_ies *ies;
1034 struct ieee80211_channel *channel;
1035 bool signal_valid;
1036 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1037 u.probe_resp.variable);
1038 int bss_type;
1039
1040 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
1041 offsetof(struct ieee80211_mgmt, u.beacon.variable));
1042
1043 trace_cfg80211_inform_bss_width_frame(wiphy, rx_channel, scan_width, mgmt,
1044 len, signal);
1045
1046 if (WARN_ON(!mgmt))
1047 return NULL;
1048
1049 if (WARN_ON(!wiphy))
1050 return NULL;
1051
1052 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
1053 (signal < 0 || signal > 100)))
1054 return NULL;
1055
1056 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
1057 return NULL;
1058
1059 channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable,
1060 ielen, rx_channel);
1061 if (!channel)
1062 return NULL;
1063
1064 ies = kzalloc(sizeof(*ies) + ielen, gfp);
1065 if (!ies)
1066 return NULL;
1067 ies->len = ielen;
1068 ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
1069 ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
1070 memcpy(ies->data, mgmt->u.probe_resp.variable, ielen);
1071
1072 if (ieee80211_is_probe_resp(mgmt->frame_control))
1073 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1074 else
1075 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1076 rcu_assign_pointer(tmp.pub.ies, ies);
1077
1078 memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN);
1079 tmp.pub.channel = channel;
1080 tmp.pub.scan_width = scan_width;
1081 tmp.pub.signal = signal;
1082 tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
1083 tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
1084
1085 signal_valid = abs(rx_channel->center_freq - channel->center_freq) <=
1086 wiphy->max_adj_channel_rssi_comp;
1087 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
1088 if (!res)
1089 return NULL;
1090
1091 if (channel->band == IEEE80211_BAND_60GHZ) {
1092 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1093 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1094 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1095 regulatory_hint_found_beacon(wiphy, channel, gfp);
1096 } else {
1097 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1098 regulatory_hint_found_beacon(wiphy, channel, gfp);
1099 }
1100
1101 trace_cfg80211_return_bss(&res->pub);
1102 /* cfg80211_bss_update gives us a referenced result */
1103 return &res->pub;
1104 }
1105 EXPORT_SYMBOL(cfg80211_inform_bss_width_frame);
1106
1107 void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1108 {
1109 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1110 struct cfg80211_internal_bss *bss;
1111
1112 if (!pub)
1113 return;
1114
1115 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1116
1117 spin_lock_bh(&rdev->bss_lock);
1118 bss_ref_get(rdev, bss);
1119 spin_unlock_bh(&rdev->bss_lock);
1120 }
1121 EXPORT_SYMBOL(cfg80211_ref_bss);
1122
1123 void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1124 {
1125 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1126 struct cfg80211_internal_bss *bss;
1127
1128 if (!pub)
1129 return;
1130
1131 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1132
1133 spin_lock_bh(&rdev->bss_lock);
1134 bss_ref_put(rdev, bss);
1135 spin_unlock_bh(&rdev->bss_lock);
1136 }
1137 EXPORT_SYMBOL(cfg80211_put_bss);
1138
1139 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1140 {
1141 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1142 struct cfg80211_internal_bss *bss;
1143
1144 if (WARN_ON(!pub))
1145 return;
1146
1147 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1148
1149 spin_lock_bh(&rdev->bss_lock);
1150 if (!list_empty(&bss->list)) {
1151 if (__cfg80211_unlink_bss(rdev, bss))
1152 rdev->bss_generation++;
1153 }
1154 spin_unlock_bh(&rdev->bss_lock);
1155 }
1156 EXPORT_SYMBOL(cfg80211_unlink_bss);
1157
1158 #ifdef CONFIG_CFG80211_WEXT
1159 static struct cfg80211_registered_device *
1160 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
1161 {
1162 struct cfg80211_registered_device *rdev;
1163 struct net_device *dev;
1164
1165 ASSERT_RTNL();
1166
1167 dev = dev_get_by_index(net, ifindex);
1168 if (!dev)
1169 return ERR_PTR(-ENODEV);
1170 if (dev->ieee80211_ptr)
1171 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
1172 else
1173 rdev = ERR_PTR(-ENODEV);
1174 dev_put(dev);
1175 return rdev;
1176 }
1177
1178 int cfg80211_wext_siwscan(struct net_device *dev,
1179 struct iw_request_info *info,
1180 union iwreq_data *wrqu, char *extra)
1181 {
1182 struct cfg80211_registered_device *rdev;
1183 struct wiphy *wiphy;
1184 struct iw_scan_req *wreq = NULL;
1185 struct cfg80211_scan_request *creq = NULL;
1186 int i, err, n_channels = 0;
1187 enum ieee80211_band band;
1188
1189 if (!netif_running(dev))
1190 return -ENETDOWN;
1191
1192 if (wrqu->data.length == sizeof(struct iw_scan_req))
1193 wreq = (struct iw_scan_req *)extra;
1194
1195 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1196
1197 if (IS_ERR(rdev))
1198 return PTR_ERR(rdev);
1199
1200 if (rdev->scan_req || rdev->scan_msg) {
1201 err = -EBUSY;
1202 goto out;
1203 }
1204
1205 wiphy = &rdev->wiphy;
1206
1207 /* Determine number of channels, needed to allocate creq */
1208 if (wreq && wreq->num_channels)
1209 n_channels = wreq->num_channels;
1210 else
1211 n_channels = ieee80211_get_num_supported_channels(wiphy);
1212
1213 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
1214 n_channels * sizeof(void *),
1215 GFP_ATOMIC);
1216 if (!creq) {
1217 err = -ENOMEM;
1218 goto out;
1219 }
1220
1221 creq->wiphy = wiphy;
1222 creq->wdev = dev->ieee80211_ptr;
1223 /* SSIDs come after channels */
1224 creq->ssids = (void *)&creq->channels[n_channels];
1225 creq->n_channels = n_channels;
1226 creq->n_ssids = 1;
1227 creq->scan_start = jiffies;
1228
1229 /* translate "Scan on frequencies" request */
1230 i = 0;
1231 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1232 int j;
1233
1234 if (!wiphy->bands[band])
1235 continue;
1236
1237 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
1238 /* ignore disabled channels */
1239 if (wiphy->bands[band]->channels[j].flags &
1240 IEEE80211_CHAN_DISABLED)
1241 continue;
1242
1243 /* If we have a wireless request structure and the
1244 * wireless request specifies frequencies, then search
1245 * for the matching hardware channel.
1246 */
1247 if (wreq && wreq->num_channels) {
1248 int k;
1249 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
1250 for (k = 0; k < wreq->num_channels; k++) {
1251 struct iw_freq *freq =
1252 &wreq->channel_list[k];
1253 int wext_freq =
1254 cfg80211_wext_freq(freq);
1255
1256 if (wext_freq == wiphy_freq)
1257 goto wext_freq_found;
1258 }
1259 goto wext_freq_not_found;
1260 }
1261
1262 wext_freq_found:
1263 creq->channels[i] = &wiphy->bands[band]->channels[j];
1264 i++;
1265 wext_freq_not_found: ;
1266 }
1267 }
1268 /* No channels found? */
1269 if (!i) {
1270 err = -EINVAL;
1271 goto out;
1272 }
1273
1274 /* Set real number of channels specified in creq->channels[] */
1275 creq->n_channels = i;
1276
1277 /* translate "Scan for SSID" request */
1278 if (wreq) {
1279 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
1280 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
1281 err = -EINVAL;
1282 goto out;
1283 }
1284 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
1285 creq->ssids[0].ssid_len = wreq->essid_len;
1286 }
1287 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
1288 creq->n_ssids = 0;
1289 }
1290
1291 for (i = 0; i < IEEE80211_NUM_BANDS; i++)
1292 if (wiphy->bands[i])
1293 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
1294
1295 rdev->scan_req = creq;
1296 err = rdev_scan(rdev, creq);
1297 if (err) {
1298 rdev->scan_req = NULL;
1299 /* creq will be freed below */
1300 } else {
1301 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
1302 /* creq now owned by driver */
1303 creq = NULL;
1304 dev_hold(dev);
1305 }
1306 out:
1307 kfree(creq);
1308 return err;
1309 }
1310 EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
1311
1312 static char *ieee80211_scan_add_ies(struct iw_request_info *info,
1313 const struct cfg80211_bss_ies *ies,
1314 char *current_ev, char *end_buf)
1315 {
1316 const u8 *pos, *end, *next;
1317 struct iw_event iwe;
1318
1319 if (!ies)
1320 return current_ev;
1321
1322 /*
1323 * If needed, fragment the IEs buffer (at IE boundaries) into short
1324 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
1325 */
1326 pos = ies->data;
1327 end = pos + ies->len;
1328
1329 while (end - pos > IW_GENERIC_IE_MAX) {
1330 next = pos + 2 + pos[1];
1331 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
1332 next = next + 2 + next[1];
1333
1334 memset(&iwe, 0, sizeof(iwe));
1335 iwe.cmd = IWEVGENIE;
1336 iwe.u.data.length = next - pos;
1337 current_ev = iwe_stream_add_point_check(info, current_ev,
1338 end_buf, &iwe,
1339 (void *)pos);
1340 if (IS_ERR(current_ev))
1341 return current_ev;
1342 pos = next;
1343 }
1344
1345 if (end > pos) {
1346 memset(&iwe, 0, sizeof(iwe));
1347 iwe.cmd = IWEVGENIE;
1348 iwe.u.data.length = end - pos;
1349 current_ev = iwe_stream_add_point_check(info, current_ev,
1350 end_buf, &iwe,
1351 (void *)pos);
1352 if (IS_ERR(current_ev))
1353 return current_ev;
1354 }
1355
1356 return current_ev;
1357 }
1358
1359 static char *
1360 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
1361 struct cfg80211_internal_bss *bss, char *current_ev,
1362 char *end_buf)
1363 {
1364 const struct cfg80211_bss_ies *ies;
1365 struct iw_event iwe;
1366 const u8 *ie;
1367 u8 buf[50];
1368 u8 *cfg, *p, *tmp;
1369 int rem, i, sig;
1370 bool ismesh = false;
1371
1372 memset(&iwe, 0, sizeof(iwe));
1373 iwe.cmd = SIOCGIWAP;
1374 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1375 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
1376 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
1377 IW_EV_ADDR_LEN);
1378 if (IS_ERR(current_ev))
1379 return current_ev;
1380
1381 memset(&iwe, 0, sizeof(iwe));
1382 iwe.cmd = SIOCGIWFREQ;
1383 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
1384 iwe.u.freq.e = 0;
1385 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
1386 IW_EV_FREQ_LEN);
1387 if (IS_ERR(current_ev))
1388 return current_ev;
1389
1390 memset(&iwe, 0, sizeof(iwe));
1391 iwe.cmd = SIOCGIWFREQ;
1392 iwe.u.freq.m = bss->pub.channel->center_freq;
1393 iwe.u.freq.e = 6;
1394 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
1395 IW_EV_FREQ_LEN);
1396 if (IS_ERR(current_ev))
1397 return current_ev;
1398
1399 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
1400 memset(&iwe, 0, sizeof(iwe));
1401 iwe.cmd = IWEVQUAL;
1402 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
1403 IW_QUAL_NOISE_INVALID |
1404 IW_QUAL_QUAL_UPDATED;
1405 switch (wiphy->signal_type) {
1406 case CFG80211_SIGNAL_TYPE_MBM:
1407 sig = bss->pub.signal / 100;
1408 iwe.u.qual.level = sig;
1409 iwe.u.qual.updated |= IW_QUAL_DBM;
1410 if (sig < -110) /* rather bad */
1411 sig = -110;
1412 else if (sig > -40) /* perfect */
1413 sig = -40;
1414 /* will give a range of 0 .. 70 */
1415 iwe.u.qual.qual = sig + 110;
1416 break;
1417 case CFG80211_SIGNAL_TYPE_UNSPEC:
1418 iwe.u.qual.level = bss->pub.signal;
1419 /* will give range 0 .. 100 */
1420 iwe.u.qual.qual = bss->pub.signal;
1421 break;
1422 default:
1423 /* not reached */
1424 break;
1425 }
1426 current_ev = iwe_stream_add_event_check(info, current_ev,
1427 end_buf, &iwe,
1428 IW_EV_QUAL_LEN);
1429 if (IS_ERR(current_ev))
1430 return current_ev;
1431 }
1432
1433 memset(&iwe, 0, sizeof(iwe));
1434 iwe.cmd = SIOCGIWENCODE;
1435 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
1436 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1437 else
1438 iwe.u.data.flags = IW_ENCODE_DISABLED;
1439 iwe.u.data.length = 0;
1440 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
1441 &iwe, "");
1442 if (IS_ERR(current_ev))
1443 return current_ev;
1444
1445 rcu_read_lock();
1446 ies = rcu_dereference(bss->pub.ies);
1447 rem = ies->len;
1448 ie = ies->data;
1449
1450 while (rem >= 2) {
1451 /* invalid data */
1452 if (ie[1] > rem - 2)
1453 break;
1454
1455 switch (ie[0]) {
1456 case WLAN_EID_SSID:
1457 memset(&iwe, 0, sizeof(iwe));
1458 iwe.cmd = SIOCGIWESSID;
1459 iwe.u.data.length = ie[1];
1460 iwe.u.data.flags = 1;
1461 current_ev = iwe_stream_add_point_check(info,
1462 current_ev,
1463 end_buf, &iwe,
1464 (u8 *)ie + 2);
1465 if (IS_ERR(current_ev))
1466 goto unlock;
1467 break;
1468 case WLAN_EID_MESH_ID:
1469 memset(&iwe, 0, sizeof(iwe));
1470 iwe.cmd = SIOCGIWESSID;
1471 iwe.u.data.length = ie[1];
1472 iwe.u.data.flags = 1;
1473 current_ev = iwe_stream_add_point_check(info,
1474 current_ev,
1475 end_buf, &iwe,
1476 (u8 *)ie + 2);
1477 if (IS_ERR(current_ev))
1478 goto unlock;
1479 break;
1480 case WLAN_EID_MESH_CONFIG:
1481 ismesh = true;
1482 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
1483 break;
1484 cfg = (u8 *)ie + 2;
1485 memset(&iwe, 0, sizeof(iwe));
1486 iwe.cmd = IWEVCUSTOM;
1487 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
1488 "0x%02X", cfg[0]);
1489 iwe.u.data.length = strlen(buf);
1490 current_ev = iwe_stream_add_point_check(info,
1491 current_ev,
1492 end_buf,
1493 &iwe, buf);
1494 if (IS_ERR(current_ev))
1495 goto unlock;
1496 sprintf(buf, "Path Selection Metric ID: 0x%02X",
1497 cfg[1]);
1498 iwe.u.data.length = strlen(buf);
1499 current_ev = iwe_stream_add_point_check(info,
1500 current_ev,
1501 end_buf,
1502 &iwe, buf);
1503 if (IS_ERR(current_ev))
1504 goto unlock;
1505 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
1506 cfg[2]);
1507 iwe.u.data.length = strlen(buf);
1508 current_ev = iwe_stream_add_point_check(info,
1509 current_ev,
1510 end_buf,
1511 &iwe, buf);
1512 if (IS_ERR(current_ev))
1513 goto unlock;
1514 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
1515 iwe.u.data.length = strlen(buf);
1516 current_ev = iwe_stream_add_point_check(info,
1517 current_ev,
1518 end_buf,
1519 &iwe, buf);
1520 if (IS_ERR(current_ev))
1521 goto unlock;
1522 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
1523 iwe.u.data.length = strlen(buf);
1524 current_ev = iwe_stream_add_point_check(info,
1525 current_ev,
1526 end_buf,
1527 &iwe, buf);
1528 if (IS_ERR(current_ev))
1529 goto unlock;
1530 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
1531 iwe.u.data.length = strlen(buf);
1532 current_ev = iwe_stream_add_point_check(info,
1533 current_ev,
1534 end_buf,
1535 &iwe, buf);
1536 if (IS_ERR(current_ev))
1537 goto unlock;
1538 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
1539 iwe.u.data.length = strlen(buf);
1540 current_ev = iwe_stream_add_point_check(info,
1541 current_ev,
1542 end_buf,
1543 &iwe, buf);
1544 if (IS_ERR(current_ev))
1545 goto unlock;
1546 break;
1547 case WLAN_EID_SUPP_RATES:
1548 case WLAN_EID_EXT_SUPP_RATES:
1549 /* display all supported rates in readable format */
1550 p = current_ev + iwe_stream_lcp_len(info);
1551
1552 memset(&iwe, 0, sizeof(iwe));
1553 iwe.cmd = SIOCGIWRATE;
1554 /* Those two flags are ignored... */
1555 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
1556
1557 for (i = 0; i < ie[1]; i++) {
1558 iwe.u.bitrate.value =
1559 ((ie[i + 2] & 0x7f) * 500000);
1560 tmp = p;
1561 p = iwe_stream_add_value(info, current_ev, p,
1562 end_buf, &iwe,
1563 IW_EV_PARAM_LEN);
1564 if (p == tmp) {
1565 current_ev = ERR_PTR(-E2BIG);
1566 goto unlock;
1567 }
1568 }
1569 current_ev = p;
1570 break;
1571 }
1572 rem -= ie[1] + 2;
1573 ie += ie[1] + 2;
1574 }
1575
1576 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
1577 ismesh) {
1578 memset(&iwe, 0, sizeof(iwe));
1579 iwe.cmd = SIOCGIWMODE;
1580 if (ismesh)
1581 iwe.u.mode = IW_MODE_MESH;
1582 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
1583 iwe.u.mode = IW_MODE_MASTER;
1584 else
1585 iwe.u.mode = IW_MODE_ADHOC;
1586 current_ev = iwe_stream_add_event_check(info, current_ev,
1587 end_buf, &iwe,
1588 IW_EV_UINT_LEN);
1589 if (IS_ERR(current_ev))
1590 goto unlock;
1591 }
1592
1593 memset(&iwe, 0, sizeof(iwe));
1594 iwe.cmd = IWEVCUSTOM;
1595 sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
1596 iwe.u.data.length = strlen(buf);
1597 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
1598 &iwe, buf);
1599 if (IS_ERR(current_ev))
1600 goto unlock;
1601 memset(&iwe, 0, sizeof(iwe));
1602 iwe.cmd = IWEVCUSTOM;
1603 sprintf(buf, " Last beacon: %ums ago",
1604 elapsed_jiffies_msecs(bss->ts));
1605 iwe.u.data.length = strlen(buf);
1606 current_ev = iwe_stream_add_point_check(info, current_ev,
1607 end_buf, &iwe, buf);
1608 if (IS_ERR(current_ev))
1609 goto unlock;
1610
1611 current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
1612
1613 unlock:
1614 rcu_read_unlock();
1615 return current_ev;
1616 }
1617
1618
1619 static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
1620 struct iw_request_info *info,
1621 char *buf, size_t len)
1622 {
1623 char *current_ev = buf;
1624 char *end_buf = buf + len;
1625 struct cfg80211_internal_bss *bss;
1626 int err = 0;
1627
1628 spin_lock_bh(&rdev->bss_lock);
1629 cfg80211_bss_expire(rdev);
1630
1631 list_for_each_entry(bss, &rdev->bss_list, list) {
1632 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
1633 err = -E2BIG;
1634 break;
1635 }
1636 current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
1637 current_ev, end_buf);
1638 if (IS_ERR(current_ev)) {
1639 err = PTR_ERR(current_ev);
1640 break;
1641 }
1642 }
1643 spin_unlock_bh(&rdev->bss_lock);
1644
1645 if (err)
1646 return err;
1647 return current_ev - buf;
1648 }
1649
1650
1651 int cfg80211_wext_giwscan(struct net_device *dev,
1652 struct iw_request_info *info,
1653 struct iw_point *data, char *extra)
1654 {
1655 struct cfg80211_registered_device *rdev;
1656 int res;
1657
1658 if (!netif_running(dev))
1659 return -ENETDOWN;
1660
1661 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1662
1663 if (IS_ERR(rdev))
1664 return PTR_ERR(rdev);
1665
1666 if (rdev->scan_req || rdev->scan_msg)
1667 return -EAGAIN;
1668
1669 res = ieee80211_scan_results(rdev, info, extra, data->length);
1670 data->length = 0;
1671 if (res >= 0) {
1672 data->length = res;
1673 res = 0;
1674 }
1675
1676 return res;
1677 }
1678 EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan);
1679 #endif
Linux kernel - Deliverables
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