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1/*
2 * cfg80211 scan result handling
3 *
4 * Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
5 * Copyright 2013-2014 Intel Mobile Communications GmbH
6 * Copyright 2016 Intel Deutschland GmbH
7 */
8#include <linux/kernel.h>
9#include <linux/slab.h>
10#include <linux/module.h>
11#include <linux/netdevice.h>
12#include <linux/wireless.h>
13#include <linux/nl80211.h>
14#include <linux/etherdevice.h>
15#include <net/arp.h>
16#include <net/cfg80211.h>
17#include <net/cfg80211-wext.h>
18#include <net/iw_handler.h>
19#include "core.h"
20#include "nl80211.h"
21#include "wext-compat.h"
22#include "rdev-ops.h"
23
24/**
25 * DOC: BSS tree/list structure
26 *
27 * At the top level, the BSS list is kept in both a list in each
28 * registered device (@bss_list) as well as an RB-tree for faster
29 * lookup. In the RB-tree, entries can be looked up using their
30 * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID
31 * for other BSSes.
32 *
33 * Due to the possibility of hidden SSIDs, there's a second level
34 * structure, the "hidden_list" and "hidden_beacon_bss" pointer.
35 * The hidden_list connects all BSSes belonging to a single AP
36 * that has a hidden SSID, and connects beacon and probe response
37 * entries. For a probe response entry for a hidden SSID, the
38 * hidden_beacon_bss pointer points to the BSS struct holding the
39 * beacon's information.
40 *
41 * Reference counting is done for all these references except for
42 * the hidden_list, so that a beacon BSS struct that is otherwise
43 * not referenced has one reference for being on the bss_list and
44 * one for each probe response entry that points to it using the
45 * hidden_beacon_bss pointer. When a BSS struct that has such a
46 * pointer is get/put, the refcount update is also propagated to
47 * the referenced struct, this ensure that it cannot get removed
48 * while somebody is using the probe response version.
49 *
50 * Note that the hidden_beacon_bss pointer never changes, due to
51 * the reference counting. Therefore, no locking is needed for
52 * it.
53 *
54 * Also note that the hidden_beacon_bss pointer is only relevant
55 * if the driver uses something other than the IEs, e.g. private
56 * data stored stored in the BSS struct, since the beacon IEs are
57 * also linked into the probe response struct.
58 */
59
60/*
61 * Limit the number of BSS entries stored in mac80211. Each one is
62 * a bit over 4k at most, so this limits to roughly 4-5M of memory.
63 * If somebody wants to really attack this though, they'd likely
64 * use small beacons, and only one type of frame, limiting each of
65 * the entries to a much smaller size (in order to generate more
66 * entries in total, so overhead is bigger.)
67 */
68static int bss_entries_limit = 1000;
69module_param(bss_entries_limit, int, 0644);
70MODULE_PARM_DESC(bss_entries_limit,
71 "limit to number of scan BSS entries (per wiphy, default 1000)");
72
73#define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ)
74
75static void bss_free(struct cfg80211_internal_bss *bss)
76{
77 struct cfg80211_bss_ies *ies;
78
79 if (WARN_ON(atomic_read(&bss->hold)))
80 return;
81
82 ies = (void *)rcu_access_pointer(bss->pub.beacon_ies);
83 if (ies && !bss->pub.hidden_beacon_bss)
84 kfree_rcu(ies, rcu_head);
85 ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies);
86 if (ies)
87 kfree_rcu(ies, rcu_head);
88
89 /*
90 * This happens when the module is removed, it doesn't
91 * really matter any more save for completeness
92 */
93 if (!list_empty(&bss->hidden_list))
94 list_del(&bss->hidden_list);
95
96 kfree(bss);
97}
98
99static inline void bss_ref_get(struct cfg80211_registered_device *rdev,
100 struct cfg80211_internal_bss *bss)
101{
102 lockdep_assert_held(&rdev->bss_lock);
103
104 bss->refcount++;
105 if (bss->pub.hidden_beacon_bss) {
106 bss = container_of(bss->pub.hidden_beacon_bss,
107 struct cfg80211_internal_bss,
108 pub);
109 bss->refcount++;
110 }
111}
112
113static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
114 struct cfg80211_internal_bss *bss)
115{
116 lockdep_assert_held(&rdev->bss_lock);
117
118 if (bss->pub.hidden_beacon_bss) {
119 struct cfg80211_internal_bss *hbss;
120 hbss = container_of(bss->pub.hidden_beacon_bss,
121 struct cfg80211_internal_bss,
122 pub);
123 hbss->refcount--;
124 if (hbss->refcount == 0)
125 bss_free(hbss);
126 }
127 bss->refcount--;
128 if (bss->refcount == 0)
129 bss_free(bss);
130}
131
132static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev,
133 struct cfg80211_internal_bss *bss)
134{
135 lockdep_assert_held(&rdev->bss_lock);
136
137 if (!list_empty(&bss->hidden_list)) {
138 /*
139 * don't remove the beacon entry if it has
140 * probe responses associated with it
141 */
142 if (!bss->pub.hidden_beacon_bss)
143 return false;
144 /*
145 * if it's a probe response entry break its
146 * link to the other entries in the group
147 */
148 list_del_init(&bss->hidden_list);
149 }
150
151 list_del_init(&bss->list);
152 rb_erase(&bss->rbn, &rdev->bss_tree);
153 rdev->bss_entries--;
154 WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list),
155 "rdev bss entries[%d]/list[empty:%d] corruption\n",
156 rdev->bss_entries, list_empty(&rdev->bss_list));
157 bss_ref_put(rdev, bss);
158 return true;
159}
160
161static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev,
162 unsigned long expire_time)
163{
164 struct cfg80211_internal_bss *bss, *tmp;
165 bool expired = false;
166
167 lockdep_assert_held(&rdev->bss_lock);
168
169 list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) {
170 if (atomic_read(&bss->hold))
171 continue;
172 if (!time_after(expire_time, bss->ts))
173 continue;
174
175 if (__cfg80211_unlink_bss(rdev, bss))
176 expired = true;
177 }
178
179 if (expired)
180 rdev->bss_generation++;
181}
182
183static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev)
184{
185 struct cfg80211_internal_bss *bss, *oldest = NULL;
186 bool ret;
187
188 lockdep_assert_held(&rdev->bss_lock);
189
190 list_for_each_entry(bss, &rdev->bss_list, list) {
191 if (atomic_read(&bss->hold))
192 continue;
193
194 if (!list_empty(&bss->hidden_list) &&
195 !bss->pub.hidden_beacon_bss)
196 continue;
197
198 if (oldest && time_before(oldest->ts, bss->ts))
199 continue;
200 oldest = bss;
201 }
202
203 if (WARN_ON(!oldest))
204 return false;
205
206 /*
207 * The callers make sure to increase rdev->bss_generation if anything
208 * gets removed (and a new entry added), so there's no need to also do
209 * it here.
210 */
211
212 ret = __cfg80211_unlink_bss(rdev, oldest);
213 WARN_ON(!ret);
214 return ret;
215}
216
217void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
218 bool send_message)
219{
220 struct cfg80211_scan_request *request;
221 struct wireless_dev *wdev;
222 struct sk_buff *msg;
223#ifdef CONFIG_CFG80211_WEXT
224 union iwreq_data wrqu;
225#endif
226
227 ASSERT_RTNL();
228
229 if (rdev->scan_msg) {
230 nl80211_send_scan_result(rdev, rdev->scan_msg);
231 rdev->scan_msg = NULL;
232 return;
233 }
234
235 request = rdev->scan_req;
236 if (!request)
237 return;
238
239 wdev = request->wdev;
240
241 /*
242 * This must be before sending the other events!
243 * Otherwise, wpa_supplicant gets completely confused with
244 * wext events.
245 */
246 if (wdev->netdev)
247 cfg80211_sme_scan_done(wdev->netdev);
248
249 if (!request->info.aborted &&
250 request->flags & NL80211_SCAN_FLAG_FLUSH) {
251 /* flush entries from previous scans */
252 spin_lock_bh(&rdev->bss_lock);
253 __cfg80211_bss_expire(rdev, request->scan_start);
254 spin_unlock_bh(&rdev->bss_lock);
255 }
256
257 msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted);
258
259#ifdef CONFIG_CFG80211_WEXT
260 if (wdev->netdev && !request->info.aborted) {
261 memset(&wrqu, 0, sizeof(wrqu));
262
263 wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
264 }
265#endif
266
267 if (wdev->netdev)
268 dev_put(wdev->netdev);
269
270 rdev->scan_req = NULL;
271 kfree(request);
272
273 if (!send_message)
274 rdev->scan_msg = msg;
275 else
276 nl80211_send_scan_result(rdev, msg);
277}
278
279void __cfg80211_scan_done(struct work_struct *wk)
280{
281 struct cfg80211_registered_device *rdev;
282
283 rdev = container_of(wk, struct cfg80211_registered_device,
284 scan_done_wk);
285
286 rtnl_lock();
287 ___cfg80211_scan_done(rdev, true);
288 rtnl_unlock();
289}
290
291void cfg80211_scan_done(struct cfg80211_scan_request *request,
292 struct cfg80211_scan_info *info)
293{
294 trace_cfg80211_scan_done(request, info);
295 WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req);
296
297 request->info = *info;
298 request->notified = true;
299 queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk);
300}
301EXPORT_SYMBOL(cfg80211_scan_done);
302
303void __cfg80211_sched_scan_results(struct work_struct *wk)
304{
305 struct cfg80211_registered_device *rdev;
306 struct cfg80211_sched_scan_request *request;
307
308 rdev = container_of(wk, struct cfg80211_registered_device,
309 sched_scan_results_wk);
310
311 rtnl_lock();
312
313 request = rtnl_dereference(rdev->sched_scan_req);
314
315 /* we don't have sched_scan_req anymore if the scan is stopping */
316 if (request) {
317 if (request->flags & NL80211_SCAN_FLAG_FLUSH) {
318 /* flush entries from previous scans */
319 spin_lock_bh(&rdev->bss_lock);
320 __cfg80211_bss_expire(rdev, request->scan_start);
321 spin_unlock_bh(&rdev->bss_lock);
322 request->scan_start = jiffies;
323 }
324 nl80211_send_sched_scan_results(rdev, request->dev);
325 }
326
327 rtnl_unlock();
328}
329
330void cfg80211_sched_scan_results(struct wiphy *wiphy)
331{
332 trace_cfg80211_sched_scan_results(wiphy);
333 /* ignore if we're not scanning */
334
335 if (rcu_access_pointer(wiphy_to_rdev(wiphy)->sched_scan_req))
336 queue_work(cfg80211_wq,
337 &wiphy_to_rdev(wiphy)->sched_scan_results_wk);
338}
339EXPORT_SYMBOL(cfg80211_sched_scan_results);
340
341void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy)
342{
343 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
344
345 ASSERT_RTNL();
346
347 trace_cfg80211_sched_scan_stopped(wiphy);
348
349 __cfg80211_stop_sched_scan(rdev, true);
350}
351EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl);
352
353void cfg80211_sched_scan_stopped(struct wiphy *wiphy)
354{
355 rtnl_lock();
356 cfg80211_sched_scan_stopped_rtnl(wiphy);
357 rtnl_unlock();
358}
359EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
360
361int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
362 bool driver_initiated)
363{
364 struct cfg80211_sched_scan_request *sched_scan_req;
365 struct net_device *dev;
366
367 ASSERT_RTNL();
368
369 if (!rdev->sched_scan_req)
370 return -ENOENT;
371
372 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
373 dev = sched_scan_req->dev;
374
375 if (!driver_initiated) {
376 int err = rdev_sched_scan_stop(rdev, dev);
377 if (err)
378 return err;
379 }
380
381 nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED);
382
383 RCU_INIT_POINTER(rdev->sched_scan_req, NULL);
384 kfree_rcu(sched_scan_req, rcu_head);
385
386 return 0;
387}
388
389void cfg80211_bss_age(struct cfg80211_registered_device *rdev,
390 unsigned long age_secs)
391{
392 struct cfg80211_internal_bss *bss;
393 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
394
395 spin_lock_bh(&rdev->bss_lock);
396 list_for_each_entry(bss, &rdev->bss_list, list)
397 bss->ts -= age_jiffies;
398 spin_unlock_bh(&rdev->bss_lock);
399}
400
401void cfg80211_bss_expire(struct cfg80211_registered_device *rdev)
402{
403 __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
404}
405
406const u8 *cfg80211_find_ie_match(u8 eid, const u8 *ies, int len,
407 const u8 *match, int match_len,
408 int match_offset)
409{
410 /* match_offset can't be smaller than 2, unless match_len is
411 * zero, in which case match_offset must be zero as well.
412 */
413 if (WARN_ON((match_len && match_offset < 2) ||
414 (!match_len && match_offset)))
415 return NULL;
416
417 while (len >= 2 && len >= ies[1] + 2) {
418 if ((ies[0] == eid) &&
419 (ies[1] + 2 >= match_offset + match_len) &&
420 !memcmp(ies + match_offset, match, match_len))
421 return ies;
422
423 len -= ies[1] + 2;
424 ies += ies[1] + 2;
425 }
426
427 return NULL;
428}
429EXPORT_SYMBOL(cfg80211_find_ie_match);
430
431const u8 *cfg80211_find_vendor_ie(unsigned int oui, int oui_type,
432 const u8 *ies, int len)
433{
434 const u8 *ie;
435 u8 match[] = { oui >> 16, oui >> 8, oui, oui_type };
436 int match_len = (oui_type < 0) ? 3 : sizeof(match);
437
438 if (WARN_ON(oui_type > 0xff))
439 return NULL;
440
441 ie = cfg80211_find_ie_match(WLAN_EID_VENDOR_SPECIFIC, ies, len,
442 match, match_len, 2);
443
444 if (ie && (ie[1] < 4))
445 return NULL;
446
447 return ie;
448}
449EXPORT_SYMBOL(cfg80211_find_vendor_ie);
450
451static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
452 const u8 *ssid, size_t ssid_len)
453{
454 const struct cfg80211_bss_ies *ies;
455 const u8 *ssidie;
456
457 if (bssid && !ether_addr_equal(a->bssid, bssid))
458 return false;
459
460 if (!ssid)
461 return true;
462
463 ies = rcu_access_pointer(a->ies);
464 if (!ies)
465 return false;
466 ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
467 if (!ssidie)
468 return false;
469 if (ssidie[1] != ssid_len)
470 return false;
471 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
472}
473
474/**
475 * enum bss_compare_mode - BSS compare mode
476 * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
477 * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
478 * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
479 */
480enum bss_compare_mode {
481 BSS_CMP_REGULAR,
482 BSS_CMP_HIDE_ZLEN,
483 BSS_CMP_HIDE_NUL,
484};
485
486static int cmp_bss(struct cfg80211_bss *a,
487 struct cfg80211_bss *b,
488 enum bss_compare_mode mode)
489{
490 const struct cfg80211_bss_ies *a_ies, *b_ies;
491 const u8 *ie1 = NULL;
492 const u8 *ie2 = NULL;
493 int i, r;
494
495 if (a->channel != b->channel)
496 return b->channel->center_freq - a->channel->center_freq;
497
498 a_ies = rcu_access_pointer(a->ies);
499 if (!a_ies)
500 return -1;
501 b_ies = rcu_access_pointer(b->ies);
502 if (!b_ies)
503 return 1;
504
505 if (WLAN_CAPABILITY_IS_STA_BSS(a->capability))
506 ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID,
507 a_ies->data, a_ies->len);
508 if (WLAN_CAPABILITY_IS_STA_BSS(b->capability))
509 ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID,
510 b_ies->data, b_ies->len);
511 if (ie1 && ie2) {
512 int mesh_id_cmp;
513
514 if (ie1[1] == ie2[1])
515 mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]);
516 else
517 mesh_id_cmp = ie2[1] - ie1[1];
518
519 ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
520 a_ies->data, a_ies->len);
521 ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
522 b_ies->data, b_ies->len);
523 if (ie1 && ie2) {
524 if (mesh_id_cmp)
525 return mesh_id_cmp;
526 if (ie1[1] != ie2[1])
527 return ie2[1] - ie1[1];
528 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
529 }
530 }
531
532 r = memcmp(a->bssid, b->bssid, sizeof(a->bssid));
533 if (r)
534 return r;
535
536 ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
537 ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
538
539 if (!ie1 && !ie2)
540 return 0;
541
542 /*
543 * Note that with "hide_ssid", the function returns a match if
544 * the already-present BSS ("b") is a hidden SSID beacon for
545 * the new BSS ("a").
546 */
547
548 /* sort missing IE before (left of) present IE */
549 if (!ie1)
550 return -1;
551 if (!ie2)
552 return 1;
553
554 switch (mode) {
555 case BSS_CMP_HIDE_ZLEN:
556 /*
557 * In ZLEN mode we assume the BSS entry we're
558 * looking for has a zero-length SSID. So if
559 * the one we're looking at right now has that,
560 * return 0. Otherwise, return the difference
561 * in length, but since we're looking for the
562 * 0-length it's really equivalent to returning
563 * the length of the one we're looking at.
564 *
565 * No content comparison is needed as we assume
566 * the content length is zero.
567 */
568 return ie2[1];
569 case BSS_CMP_REGULAR:
570 default:
571 /* sort by length first, then by contents */
572 if (ie1[1] != ie2[1])
573 return ie2[1] - ie1[1];
574 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
575 case BSS_CMP_HIDE_NUL:
576 if (ie1[1] != ie2[1])
577 return ie2[1] - ie1[1];
578 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */
579 for (i = 0; i < ie2[1]; i++)
580 if (ie2[i + 2])
581 return -1;
582 return 0;
583 }
584}
585
586static bool cfg80211_bss_type_match(u16 capability,
587 enum nl80211_band band,
588 enum ieee80211_bss_type bss_type)
589{
590 bool ret = true;
591 u16 mask, val;
592
593 if (bss_type == IEEE80211_BSS_TYPE_ANY)
594 return ret;
595
596 if (band == NL80211_BAND_60GHZ) {
597 mask = WLAN_CAPABILITY_DMG_TYPE_MASK;
598 switch (bss_type) {
599 case IEEE80211_BSS_TYPE_ESS:
600 val = WLAN_CAPABILITY_DMG_TYPE_AP;
601 break;
602 case IEEE80211_BSS_TYPE_PBSS:
603 val = WLAN_CAPABILITY_DMG_TYPE_PBSS;
604 break;
605 case IEEE80211_BSS_TYPE_IBSS:
606 val = WLAN_CAPABILITY_DMG_TYPE_IBSS;
607 break;
608 default:
609 return false;
610 }
611 } else {
612 mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS;
613 switch (bss_type) {
614 case IEEE80211_BSS_TYPE_ESS:
615 val = WLAN_CAPABILITY_ESS;
616 break;
617 case IEEE80211_BSS_TYPE_IBSS:
618 val = WLAN_CAPABILITY_IBSS;
619 break;
620 case IEEE80211_BSS_TYPE_MBSS:
621 val = 0;
622 break;
623 default:
624 return false;
625 }
626 }
627
628 ret = ((capability & mask) == val);
629 return ret;
630}
631
632/* Returned bss is reference counted and must be cleaned up appropriately. */
633struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
634 struct ieee80211_channel *channel,
635 const u8 *bssid,
636 const u8 *ssid, size_t ssid_len,
637 enum ieee80211_bss_type bss_type,
638 enum ieee80211_privacy privacy)
639{
640 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
641 struct cfg80211_internal_bss *bss, *res = NULL;
642 unsigned long now = jiffies;
643 int bss_privacy;
644
645 trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type,
646 privacy);
647
648 spin_lock_bh(&rdev->bss_lock);
649
650 list_for_each_entry(bss, &rdev->bss_list, list) {
651 if (!cfg80211_bss_type_match(bss->pub.capability,
652 bss->pub.channel->band, bss_type))
653 continue;
654
655 bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY);
656 if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) ||
657 (privacy == IEEE80211_PRIVACY_OFF && bss_privacy))
658 continue;
659 if (channel && bss->pub.channel != channel)
660 continue;
661 if (!is_valid_ether_addr(bss->pub.bssid))
662 continue;
663 /* Don't get expired BSS structs */
664 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
665 !atomic_read(&bss->hold))
666 continue;
667 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
668 res = bss;
669 bss_ref_get(rdev, res);
670 break;
671 }
672 }
673
674 spin_unlock_bh(&rdev->bss_lock);
675 if (!res)
676 return NULL;
677 trace_cfg80211_return_bss(&res->pub);
678 return &res->pub;
679}
680EXPORT_SYMBOL(cfg80211_get_bss);
681
682static void rb_insert_bss(struct cfg80211_registered_device *rdev,
683 struct cfg80211_internal_bss *bss)
684{
685 struct rb_node **p = &rdev->bss_tree.rb_node;
686 struct rb_node *parent = NULL;
687 struct cfg80211_internal_bss *tbss;
688 int cmp;
689
690 while (*p) {
691 parent = *p;
692 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
693
694 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR);
695
696 if (WARN_ON(!cmp)) {
697 /* will sort of leak this BSS */
698 return;
699 }
700
701 if (cmp < 0)
702 p = &(*p)->rb_left;
703 else
704 p = &(*p)->rb_right;
705 }
706
707 rb_link_node(&bss->rbn, parent, p);
708 rb_insert_color(&bss->rbn, &rdev->bss_tree);
709}
710
711static struct cfg80211_internal_bss *
712rb_find_bss(struct cfg80211_registered_device *rdev,
713 struct cfg80211_internal_bss *res,
714 enum bss_compare_mode mode)
715{
716 struct rb_node *n = rdev->bss_tree.rb_node;
717 struct cfg80211_internal_bss *bss;
718 int r;
719
720 while (n) {
721 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
722 r = cmp_bss(&res->pub, &bss->pub, mode);
723
724 if (r == 0)
725 return bss;
726 else if (r < 0)
727 n = n->rb_left;
728 else
729 n = n->rb_right;
730 }
731
732 return NULL;
733}
734
735static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev,
736 struct cfg80211_internal_bss *new)
737{
738 const struct cfg80211_bss_ies *ies;
739 struct cfg80211_internal_bss *bss;
740 const u8 *ie;
741 int i, ssidlen;
742 u8 fold = 0;
743 u32 n_entries = 0;
744
745 ies = rcu_access_pointer(new->pub.beacon_ies);
746 if (WARN_ON(!ies))
747 return false;
748
749 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
750 if (!ie) {
751 /* nothing to do */
752 return true;
753 }
754
755 ssidlen = ie[1];
756 for (i = 0; i < ssidlen; i++)
757 fold |= ie[2 + i];
758
759 if (fold) {
760 /* not a hidden SSID */
761 return true;
762 }
763
764 /* This is the bad part ... */
765
766 list_for_each_entry(bss, &rdev->bss_list, list) {
767 /*
768 * we're iterating all the entries anyway, so take the
769 * opportunity to validate the list length accounting
770 */
771 n_entries++;
772
773 if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid))
774 continue;
775 if (bss->pub.channel != new->pub.channel)
776 continue;
777 if (bss->pub.scan_width != new->pub.scan_width)
778 continue;
779 if (rcu_access_pointer(bss->pub.beacon_ies))
780 continue;
781 ies = rcu_access_pointer(bss->pub.ies);
782 if (!ies)
783 continue;
784 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
785 if (!ie)
786 continue;
787 if (ssidlen && ie[1] != ssidlen)
788 continue;
789 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss))
790 continue;
791 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list)))
792 list_del(&bss->hidden_list);
793 /* combine them */
794 list_add(&bss->hidden_list, &new->hidden_list);
795 bss->pub.hidden_beacon_bss = &new->pub;
796 new->refcount += bss->refcount;
797 rcu_assign_pointer(bss->pub.beacon_ies,
798 new->pub.beacon_ies);
799 }
800
801 WARN_ONCE(n_entries != rdev->bss_entries,
802 "rdev bss entries[%d]/list[len:%d] corruption\n",
803 rdev->bss_entries, n_entries);
804
805 return true;
806}
807
808/* Returned bss is reference counted and must be cleaned up appropriately. */
809static struct cfg80211_internal_bss *
810cfg80211_bss_update(struct cfg80211_registered_device *rdev,
811 struct cfg80211_internal_bss *tmp,
812 bool signal_valid)
813{
814 struct cfg80211_internal_bss *found = NULL;
815
816 if (WARN_ON(!tmp->pub.channel))
817 return NULL;
818
819 tmp->ts = jiffies;
820
821 spin_lock_bh(&rdev->bss_lock);
822
823 if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
824 spin_unlock_bh(&rdev->bss_lock);
825 return NULL;
826 }
827
828 found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR);
829
830 if (found) {
831 /* Update IEs */
832 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
833 const struct cfg80211_bss_ies *old;
834
835 old = rcu_access_pointer(found->pub.proberesp_ies);
836
837 rcu_assign_pointer(found->pub.proberesp_ies,
838 tmp->pub.proberesp_ies);
839 /* Override possible earlier Beacon frame IEs */
840 rcu_assign_pointer(found->pub.ies,
841 tmp->pub.proberesp_ies);
842 if (old)
843 kfree_rcu((struct cfg80211_bss_ies *)old,
844 rcu_head);
845 } else if (rcu_access_pointer(tmp->pub.beacon_ies)) {
846 const struct cfg80211_bss_ies *old;
847 struct cfg80211_internal_bss *bss;
848
849 if (found->pub.hidden_beacon_bss &&
850 !list_empty(&found->hidden_list)) {
851 const struct cfg80211_bss_ies *f;
852
853 /*
854 * The found BSS struct is one of the probe
855 * response members of a group, but we're
856 * receiving a beacon (beacon_ies in the tmp
857 * bss is used). This can only mean that the
858 * AP changed its beacon from not having an
859 * SSID to showing it, which is confusing so
860 * drop this information.
861 */
862
863 f = rcu_access_pointer(tmp->pub.beacon_ies);
864 kfree_rcu((struct cfg80211_bss_ies *)f,
865 rcu_head);
866 goto drop;
867 }
868
869 old = rcu_access_pointer(found->pub.beacon_ies);
870
871 rcu_assign_pointer(found->pub.beacon_ies,
872 tmp->pub.beacon_ies);
873
874 /* Override IEs if they were from a beacon before */
875 if (old == rcu_access_pointer(found->pub.ies))
876 rcu_assign_pointer(found->pub.ies,
877 tmp->pub.beacon_ies);
878
879 /* Assign beacon IEs to all sub entries */
880 list_for_each_entry(bss, &found->hidden_list,
881 hidden_list) {
882 const struct cfg80211_bss_ies *ies;
883
884 ies = rcu_access_pointer(bss->pub.beacon_ies);
885 WARN_ON(ies != old);
886
887 rcu_assign_pointer(bss->pub.beacon_ies,
888 tmp->pub.beacon_ies);
889 }
890
891 if (old)
892 kfree_rcu((struct cfg80211_bss_ies *)old,
893 rcu_head);
894 }
895
896 found->pub.beacon_interval = tmp->pub.beacon_interval;
897 /*
898 * don't update the signal if beacon was heard on
899 * adjacent channel.
900 */
901 if (signal_valid)
902 found->pub.signal = tmp->pub.signal;
903 found->pub.capability = tmp->pub.capability;
904 found->ts = tmp->ts;
905 found->ts_boottime = tmp->ts_boottime;
906 found->parent_tsf = tmp->parent_tsf;
907 ether_addr_copy(found->parent_bssid, tmp->parent_bssid);
908 } else {
909 struct cfg80211_internal_bss *new;
910 struct cfg80211_internal_bss *hidden;
911 struct cfg80211_bss_ies *ies;
912
913 /*
914 * create a copy -- the "res" variable that is passed in
915 * is allocated on the stack since it's not needed in the
916 * more common case of an update
917 */
918 new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size,
919 GFP_ATOMIC);
920 if (!new) {
921 ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
922 if (ies)
923 kfree_rcu(ies, rcu_head);
924 ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
925 if (ies)
926 kfree_rcu(ies, rcu_head);
927 goto drop;
928 }
929 memcpy(new, tmp, sizeof(*new));
930 new->refcount = 1;
931 INIT_LIST_HEAD(&new->hidden_list);
932
933 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
934 hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
935 if (!hidden)
936 hidden = rb_find_bss(rdev, tmp,
937 BSS_CMP_HIDE_NUL);
938 if (hidden) {
939 new->pub.hidden_beacon_bss = &hidden->pub;
940 list_add(&new->hidden_list,
941 &hidden->hidden_list);
942 hidden->refcount++;
943 rcu_assign_pointer(new->pub.beacon_ies,
944 hidden->pub.beacon_ies);
945 }
946 } else {
947 /*
948 * Ok so we found a beacon, and don't have an entry. If
949 * it's a beacon with hidden SSID, we might be in for an
950 * expensive search for any probe responses that should
951 * be grouped with this beacon for updates ...
952 */
953 if (!cfg80211_combine_bsses(rdev, new)) {
954 kfree(new);
955 goto drop;
956 }
957 }
958
959 if (rdev->bss_entries >= bss_entries_limit &&
960 !cfg80211_bss_expire_oldest(rdev)) {
961 kfree(new);
962 goto drop;
963 }
964
965 list_add_tail(&new->list, &rdev->bss_list);
966 rdev->bss_entries++;
967 rb_insert_bss(rdev, new);
968 found = new;
969 }
970
971 rdev->bss_generation++;
972 bss_ref_get(rdev, found);
973 spin_unlock_bh(&rdev->bss_lock);
974
975 return found;
976 drop:
977 spin_unlock_bh(&rdev->bss_lock);
978 return NULL;
979}
980
981static struct ieee80211_channel *
982cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
983 struct ieee80211_channel *channel)
984{
985 const u8 *tmp;
986 u32 freq;
987 int channel_number = -1;
988
989 tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen);
990 if (tmp && tmp[1] == 1) {
991 channel_number = tmp[2];
992 } else {
993 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen);
994 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) {
995 struct ieee80211_ht_operation *htop = (void *)(tmp + 2);
996
997 channel_number = htop->primary_chan;
998 }
999 }
1000
1001 if (channel_number < 0)
1002 return channel;
1003
1004 freq = ieee80211_channel_to_frequency(channel_number, channel->band);
1005 channel = ieee80211_get_channel(wiphy, freq);
1006 if (!channel)
1007 return NULL;
1008 if (channel->flags & IEEE80211_CHAN_DISABLED)
1009 return NULL;
1010 return channel;
1011}
1012
1013/* Returned bss is reference counted and must be cleaned up appropriately. */
1014struct cfg80211_bss *
1015cfg80211_inform_bss_data(struct wiphy *wiphy,
1016 struct cfg80211_inform_bss *data,
1017 enum cfg80211_bss_frame_type ftype,
1018 const u8 *bssid, u64 tsf, u16 capability,
1019 u16 beacon_interval, const u8 *ie, size_t ielen,
1020 gfp_t gfp)
1021{
1022 struct cfg80211_bss_ies *ies;
1023 struct ieee80211_channel *channel;
1024 struct cfg80211_internal_bss tmp = {}, *res;
1025 int bss_type;
1026 bool signal_valid;
1027
1028 if (WARN_ON(!wiphy))
1029 return NULL;
1030
1031 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
1032 (data->signal < 0 || data->signal > 100)))
1033 return NULL;
1034
1035 channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan);
1036 if (!channel)
1037 return NULL;
1038
1039 memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
1040 tmp.pub.channel = channel;
1041 tmp.pub.scan_width = data->scan_width;
1042 tmp.pub.signal = data->signal;
1043 tmp.pub.beacon_interval = beacon_interval;
1044 tmp.pub.capability = capability;
1045 tmp.ts_boottime = data->boottime_ns;
1046
1047 /*
1048 * If we do not know here whether the IEs are from a Beacon or Probe
1049 * Response frame, we need to pick one of the options and only use it
1050 * with the driver that does not provide the full Beacon/Probe Response
1051 * frame. Use Beacon frame pointer to avoid indicating that this should
1052 * override the IEs pointer should we have received an earlier
1053 * indication of Probe Response data.
1054 */
1055 ies = kzalloc(sizeof(*ies) + ielen, gfp);
1056 if (!ies)
1057 return NULL;
1058 ies->len = ielen;
1059 ies->tsf = tsf;
1060 ies->from_beacon = false;
1061 memcpy(ies->data, ie, ielen);
1062
1063 switch (ftype) {
1064 case CFG80211_BSS_FTYPE_BEACON:
1065 ies->from_beacon = true;
1066 /* fall through to assign */
1067 case CFG80211_BSS_FTYPE_UNKNOWN:
1068 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1069 break;
1070 case CFG80211_BSS_FTYPE_PRESP:
1071 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1072 break;
1073 }
1074 rcu_assign_pointer(tmp.pub.ies, ies);
1075
1076 signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
1077 wiphy->max_adj_channel_rssi_comp;
1078 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
1079 if (!res)
1080 return NULL;
1081
1082 if (channel->band == NL80211_BAND_60GHZ) {
1083 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1084 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1085 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1086 regulatory_hint_found_beacon(wiphy, channel, gfp);
1087 } else {
1088 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1089 regulatory_hint_found_beacon(wiphy, channel, gfp);
1090 }
1091
1092 trace_cfg80211_return_bss(&res->pub);
1093 /* cfg80211_bss_update gives us a referenced result */
1094 return &res->pub;
1095}
1096EXPORT_SYMBOL(cfg80211_inform_bss_data);
1097
1098/* cfg80211_inform_bss_width_frame helper */
1099struct cfg80211_bss *
1100cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
1101 struct cfg80211_inform_bss *data,
1102 struct ieee80211_mgmt *mgmt, size_t len,
1103 gfp_t gfp)
1104
1105{
1106 struct cfg80211_internal_bss tmp = {}, *res;
1107 struct cfg80211_bss_ies *ies;
1108 struct ieee80211_channel *channel;
1109 bool signal_valid;
1110 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1111 u.probe_resp.variable);
1112 int bss_type;
1113
1114 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
1115 offsetof(struct ieee80211_mgmt, u.beacon.variable));
1116
1117 trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len);
1118
1119 if (WARN_ON(!mgmt))
1120 return NULL;
1121
1122 if (WARN_ON(!wiphy))
1123 return NULL;
1124
1125 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
1126 (data->signal < 0 || data->signal > 100)))
1127 return NULL;
1128
1129 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
1130 return NULL;
1131
1132 channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable,
1133 ielen, data->chan);
1134 if (!channel)
1135 return NULL;
1136
1137 ies = kzalloc(sizeof(*ies) + ielen, gfp);
1138 if (!ies)
1139 return NULL;
1140 ies->len = ielen;
1141 ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
1142 ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
1143 memcpy(ies->data, mgmt->u.probe_resp.variable, ielen);
1144
1145 if (ieee80211_is_probe_resp(mgmt->frame_control))
1146 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1147 else
1148 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1149 rcu_assign_pointer(tmp.pub.ies, ies);
1150
1151 memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN);
1152 tmp.pub.channel = channel;
1153 tmp.pub.scan_width = data->scan_width;
1154 tmp.pub.signal = data->signal;
1155 tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
1156 tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
1157 tmp.ts_boottime = data->boottime_ns;
1158 tmp.parent_tsf = data->parent_tsf;
1159 ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
1160
1161 signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
1162 wiphy->max_adj_channel_rssi_comp;
1163 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
1164 if (!res)
1165 return NULL;
1166
1167 if (channel->band == NL80211_BAND_60GHZ) {
1168 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1169 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1170 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1171 regulatory_hint_found_beacon(wiphy, channel, gfp);
1172 } else {
1173 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1174 regulatory_hint_found_beacon(wiphy, channel, gfp);
1175 }
1176
1177 trace_cfg80211_return_bss(&res->pub);
1178 /* cfg80211_bss_update gives us a referenced result */
1179 return &res->pub;
1180}
1181EXPORT_SYMBOL(cfg80211_inform_bss_frame_data);
1182
1183void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1184{
1185 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1186 struct cfg80211_internal_bss *bss;
1187
1188 if (!pub)
1189 return;
1190
1191 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1192
1193 spin_lock_bh(&rdev->bss_lock);
1194 bss_ref_get(rdev, bss);
1195 spin_unlock_bh(&rdev->bss_lock);
1196}
1197EXPORT_SYMBOL(cfg80211_ref_bss);
1198
1199void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1200{
1201 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1202 struct cfg80211_internal_bss *bss;
1203
1204 if (!pub)
1205 return;
1206
1207 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1208
1209 spin_lock_bh(&rdev->bss_lock);
1210 bss_ref_put(rdev, bss);
1211 spin_unlock_bh(&rdev->bss_lock);
1212}
1213EXPORT_SYMBOL(cfg80211_put_bss);
1214
1215void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1216{
1217 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1218 struct cfg80211_internal_bss *bss;
1219
1220 if (WARN_ON(!pub))
1221 return;
1222
1223 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1224
1225 spin_lock_bh(&rdev->bss_lock);
1226 if (!list_empty(&bss->list)) {
1227 if (__cfg80211_unlink_bss(rdev, bss))
1228 rdev->bss_generation++;
1229 }
1230 spin_unlock_bh(&rdev->bss_lock);
1231}
1232EXPORT_SYMBOL(cfg80211_unlink_bss);
1233
1234#ifdef CONFIG_CFG80211_WEXT
1235static struct cfg80211_registered_device *
1236cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
1237{
1238 struct cfg80211_registered_device *rdev;
1239 struct net_device *dev;
1240
1241 ASSERT_RTNL();
1242
1243 dev = dev_get_by_index(net, ifindex);
1244 if (!dev)
1245 return ERR_PTR(-ENODEV);
1246 if (dev->ieee80211_ptr)
1247 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
1248 else
1249 rdev = ERR_PTR(-ENODEV);
1250 dev_put(dev);
1251 return rdev;
1252}
1253
1254int cfg80211_wext_siwscan(struct net_device *dev,
1255 struct iw_request_info *info,
1256 union iwreq_data *wrqu, char *extra)
1257{
1258 struct cfg80211_registered_device *rdev;
1259 struct wiphy *wiphy;
1260 struct iw_scan_req *wreq = NULL;
1261 struct cfg80211_scan_request *creq = NULL;
1262 int i, err, n_channels = 0;
1263 enum nl80211_band band;
1264
1265 if (!netif_running(dev))
1266 return -ENETDOWN;
1267
1268 if (wrqu->data.length == sizeof(struct iw_scan_req))
1269 wreq = (struct iw_scan_req *)extra;
1270
1271 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1272
1273 if (IS_ERR(rdev))
1274 return PTR_ERR(rdev);
1275
1276 if (rdev->scan_req || rdev->scan_msg) {
1277 err = -EBUSY;
1278 goto out;
1279 }
1280
1281 wiphy = &rdev->wiphy;
1282
1283 /* Determine number of channels, needed to allocate creq */
1284 if (wreq && wreq->num_channels)
1285 n_channels = wreq->num_channels;
1286 else
1287 n_channels = ieee80211_get_num_supported_channels(wiphy);
1288
1289 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
1290 n_channels * sizeof(void *),
1291 GFP_ATOMIC);
1292 if (!creq) {
1293 err = -ENOMEM;
1294 goto out;
1295 }
1296
1297 creq->wiphy = wiphy;
1298 creq->wdev = dev->ieee80211_ptr;
1299 /* SSIDs come after channels */
1300 creq->ssids = (void *)&creq->channels[n_channels];
1301 creq->n_channels = n_channels;
1302 creq->n_ssids = 1;
1303 creq->scan_start = jiffies;
1304
1305 /* translate "Scan on frequencies" request */
1306 i = 0;
1307 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1308 int j;
1309
1310 if (!wiphy->bands[band])
1311 continue;
1312
1313 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
1314 /* ignore disabled channels */
1315 if (wiphy->bands[band]->channels[j].flags &
1316 IEEE80211_CHAN_DISABLED)
1317 continue;
1318
1319 /* If we have a wireless request structure and the
1320 * wireless request specifies frequencies, then search
1321 * for the matching hardware channel.
1322 */
1323 if (wreq && wreq->num_channels) {
1324 int k;
1325 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
1326 for (k = 0; k < wreq->num_channels; k++) {
1327 struct iw_freq *freq =
1328 &wreq->channel_list[k];
1329 int wext_freq =
1330 cfg80211_wext_freq(freq);
1331
1332 if (wext_freq == wiphy_freq)
1333 goto wext_freq_found;
1334 }
1335 goto wext_freq_not_found;
1336 }
1337
1338 wext_freq_found:
1339 creq->channels[i] = &wiphy->bands[band]->channels[j];
1340 i++;
1341 wext_freq_not_found: ;
1342 }
1343 }
1344 /* No channels found? */
1345 if (!i) {
1346 err = -EINVAL;
1347 goto out;
1348 }
1349
1350 /* Set real number of channels specified in creq->channels[] */
1351 creq->n_channels = i;
1352
1353 /* translate "Scan for SSID" request */
1354 if (wreq) {
1355 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
1356 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
1357 err = -EINVAL;
1358 goto out;
1359 }
1360 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
1361 creq->ssids[0].ssid_len = wreq->essid_len;
1362 }
1363 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
1364 creq->n_ssids = 0;
1365 }
1366
1367 for (i = 0; i < NUM_NL80211_BANDS; i++)
1368 if (wiphy->bands[i])
1369 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
1370
1371 eth_broadcast_addr(creq->bssid);
1372
1373 rdev->scan_req = creq;
1374 err = rdev_scan(rdev, creq);
1375 if (err) {
1376 rdev->scan_req = NULL;
1377 /* creq will be freed below */
1378 } else {
1379 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
1380 /* creq now owned by driver */
1381 creq = NULL;
1382 dev_hold(dev);
1383 }
1384 out:
1385 kfree(creq);
1386 return err;
1387}
1388EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
1389
1390static char *ieee80211_scan_add_ies(struct iw_request_info *info,
1391 const struct cfg80211_bss_ies *ies,
1392 char *current_ev, char *end_buf)
1393{
1394 const u8 *pos, *end, *next;
1395 struct iw_event iwe;
1396
1397 if (!ies)
1398 return current_ev;
1399
1400 /*
1401 * If needed, fragment the IEs buffer (at IE boundaries) into short
1402 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
1403 */
1404 pos = ies->data;
1405 end = pos + ies->len;
1406
1407 while (end - pos > IW_GENERIC_IE_MAX) {
1408 next = pos + 2 + pos[1];
1409 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
1410 next = next + 2 + next[1];
1411
1412 memset(&iwe, 0, sizeof(iwe));
1413 iwe.cmd = IWEVGENIE;
1414 iwe.u.data.length = next - pos;
1415 current_ev = iwe_stream_add_point_check(info, current_ev,
1416 end_buf, &iwe,
1417 (void *)pos);
1418 if (IS_ERR(current_ev))
1419 return current_ev;
1420 pos = next;
1421 }
1422
1423 if (end > pos) {
1424 memset(&iwe, 0, sizeof(iwe));
1425 iwe.cmd = IWEVGENIE;
1426 iwe.u.data.length = end - pos;
1427 current_ev = iwe_stream_add_point_check(info, current_ev,
1428 end_buf, &iwe,
1429 (void *)pos);
1430 if (IS_ERR(current_ev))
1431 return current_ev;
1432 }
1433
1434 return current_ev;
1435}
1436
1437static char *
1438ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
1439 struct cfg80211_internal_bss *bss, char *current_ev,
1440 char *end_buf)
1441{
1442 const struct cfg80211_bss_ies *ies;
1443 struct iw_event iwe;
1444 const u8 *ie;
1445 u8 buf[50];
1446 u8 *cfg, *p, *tmp;
1447 int rem, i, sig;
1448 bool ismesh = false;
1449
1450 memset(&iwe, 0, sizeof(iwe));
1451 iwe.cmd = SIOCGIWAP;
1452 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1453 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
1454 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
1455 IW_EV_ADDR_LEN);
1456 if (IS_ERR(current_ev))
1457 return current_ev;
1458
1459 memset(&iwe, 0, sizeof(iwe));
1460 iwe.cmd = SIOCGIWFREQ;
1461 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
1462 iwe.u.freq.e = 0;
1463 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
1464 IW_EV_FREQ_LEN);
1465 if (IS_ERR(current_ev))
1466 return current_ev;
1467
1468 memset(&iwe, 0, sizeof(iwe));
1469 iwe.cmd = SIOCGIWFREQ;
1470 iwe.u.freq.m = bss->pub.channel->center_freq;
1471 iwe.u.freq.e = 6;
1472 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
1473 IW_EV_FREQ_LEN);
1474 if (IS_ERR(current_ev))
1475 return current_ev;
1476
1477 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
1478 memset(&iwe, 0, sizeof(iwe));
1479 iwe.cmd = IWEVQUAL;
1480 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
1481 IW_QUAL_NOISE_INVALID |
1482 IW_QUAL_QUAL_UPDATED;
1483 switch (wiphy->signal_type) {
1484 case CFG80211_SIGNAL_TYPE_MBM:
1485 sig = bss->pub.signal / 100;
1486 iwe.u.qual.level = sig;
1487 iwe.u.qual.updated |= IW_QUAL_DBM;
1488 if (sig < -110) /* rather bad */
1489 sig = -110;
1490 else if (sig > -40) /* perfect */
1491 sig = -40;
1492 /* will give a range of 0 .. 70 */
1493 iwe.u.qual.qual = sig + 110;
1494 break;
1495 case CFG80211_SIGNAL_TYPE_UNSPEC:
1496 iwe.u.qual.level = bss->pub.signal;
1497 /* will give range 0 .. 100 */
1498 iwe.u.qual.qual = bss->pub.signal;
1499 break;
1500 default:
1501 /* not reached */
1502 break;
1503 }
1504 current_ev = iwe_stream_add_event_check(info, current_ev,
1505 end_buf, &iwe,
1506 IW_EV_QUAL_LEN);
1507 if (IS_ERR(current_ev))
1508 return current_ev;
1509 }
1510
1511 memset(&iwe, 0, sizeof(iwe));
1512 iwe.cmd = SIOCGIWENCODE;
1513 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
1514 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1515 else
1516 iwe.u.data.flags = IW_ENCODE_DISABLED;
1517 iwe.u.data.length = 0;
1518 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
1519 &iwe, "");
1520 if (IS_ERR(current_ev))
1521 return current_ev;
1522
1523 rcu_read_lock();
1524 ies = rcu_dereference(bss->pub.ies);
1525 rem = ies->len;
1526 ie = ies->data;
1527
1528 while (rem >= 2) {
1529 /* invalid data */
1530 if (ie[1] > rem - 2)
1531 break;
1532
1533 switch (ie[0]) {
1534 case WLAN_EID_SSID:
1535 memset(&iwe, 0, sizeof(iwe));
1536 iwe.cmd = SIOCGIWESSID;
1537 iwe.u.data.length = ie[1];
1538 iwe.u.data.flags = 1;
1539 current_ev = iwe_stream_add_point_check(info,
1540 current_ev,
1541 end_buf, &iwe,
1542 (u8 *)ie + 2);
1543 if (IS_ERR(current_ev))
1544 goto unlock;
1545 break;
1546 case WLAN_EID_MESH_ID:
1547 memset(&iwe, 0, sizeof(iwe));
1548 iwe.cmd = SIOCGIWESSID;
1549 iwe.u.data.length = ie[1];
1550 iwe.u.data.flags = 1;
1551 current_ev = iwe_stream_add_point_check(info,
1552 current_ev,
1553 end_buf, &iwe,
1554 (u8 *)ie + 2);
1555 if (IS_ERR(current_ev))
1556 goto unlock;
1557 break;
1558 case WLAN_EID_MESH_CONFIG:
1559 ismesh = true;
1560 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
1561 break;
1562 cfg = (u8 *)ie + 2;
1563 memset(&iwe, 0, sizeof(iwe));
1564 iwe.cmd = IWEVCUSTOM;
1565 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
1566 "0x%02X", cfg[0]);
1567 iwe.u.data.length = strlen(buf);
1568 current_ev = iwe_stream_add_point_check(info,
1569 current_ev,
1570 end_buf,
1571 &iwe, buf);
1572 if (IS_ERR(current_ev))
1573 goto unlock;
1574 sprintf(buf, "Path Selection Metric ID: 0x%02X",
1575 cfg[1]);
1576 iwe.u.data.length = strlen(buf);
1577 current_ev = iwe_stream_add_point_check(info,
1578 current_ev,
1579 end_buf,
1580 &iwe, buf);
1581 if (IS_ERR(current_ev))
1582 goto unlock;
1583 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
1584 cfg[2]);
1585 iwe.u.data.length = strlen(buf);
1586 current_ev = iwe_stream_add_point_check(info,
1587 current_ev,
1588 end_buf,
1589 &iwe, buf);
1590 if (IS_ERR(current_ev))
1591 goto unlock;
1592 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
1593 iwe.u.data.length = strlen(buf);
1594 current_ev = iwe_stream_add_point_check(info,
1595 current_ev,
1596 end_buf,
1597 &iwe, buf);
1598 if (IS_ERR(current_ev))
1599 goto unlock;
1600 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
1601 iwe.u.data.length = strlen(buf);
1602 current_ev = iwe_stream_add_point_check(info,
1603 current_ev,
1604 end_buf,
1605 &iwe, buf);
1606 if (IS_ERR(current_ev))
1607 goto unlock;
1608 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
1609 iwe.u.data.length = strlen(buf);
1610 current_ev = iwe_stream_add_point_check(info,
1611 current_ev,
1612 end_buf,
1613 &iwe, buf);
1614 if (IS_ERR(current_ev))
1615 goto unlock;
1616 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
1617 iwe.u.data.length = strlen(buf);
1618 current_ev = iwe_stream_add_point_check(info,
1619 current_ev,
1620 end_buf,
1621 &iwe, buf);
1622 if (IS_ERR(current_ev))
1623 goto unlock;
1624 break;
1625 case WLAN_EID_SUPP_RATES:
1626 case WLAN_EID_EXT_SUPP_RATES:
1627 /* display all supported rates in readable format */
1628 p = current_ev + iwe_stream_lcp_len(info);
1629
1630 memset(&iwe, 0, sizeof(iwe));
1631 iwe.cmd = SIOCGIWRATE;
1632 /* Those two flags are ignored... */
1633 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
1634
1635 for (i = 0; i < ie[1]; i++) {
1636 iwe.u.bitrate.value =
1637 ((ie[i + 2] & 0x7f) * 500000);
1638 tmp = p;
1639 p = iwe_stream_add_value(info, current_ev, p,
1640 end_buf, &iwe,
1641 IW_EV_PARAM_LEN);
1642 if (p == tmp) {
1643 current_ev = ERR_PTR(-E2BIG);
1644 goto unlock;
1645 }
1646 }
1647 current_ev = p;
1648 break;
1649 }
1650 rem -= ie[1] + 2;
1651 ie += ie[1] + 2;
1652 }
1653
1654 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
1655 ismesh) {
1656 memset(&iwe, 0, sizeof(iwe));
1657 iwe.cmd = SIOCGIWMODE;
1658 if (ismesh)
1659 iwe.u.mode = IW_MODE_MESH;
1660 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
1661 iwe.u.mode = IW_MODE_MASTER;
1662 else
1663 iwe.u.mode = IW_MODE_ADHOC;
1664 current_ev = iwe_stream_add_event_check(info, current_ev,
1665 end_buf, &iwe,
1666 IW_EV_UINT_LEN);
1667 if (IS_ERR(current_ev))
1668 goto unlock;
1669 }
1670
1671 memset(&iwe, 0, sizeof(iwe));
1672 iwe.cmd = IWEVCUSTOM;
1673 sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
1674 iwe.u.data.length = strlen(buf);
1675 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
1676 &iwe, buf);
1677 if (IS_ERR(current_ev))
1678 goto unlock;
1679 memset(&iwe, 0, sizeof(iwe));
1680 iwe.cmd = IWEVCUSTOM;
1681 sprintf(buf, " Last beacon: %ums ago",
1682 elapsed_jiffies_msecs(bss->ts));
1683 iwe.u.data.length = strlen(buf);
1684 current_ev = iwe_stream_add_point_check(info, current_ev,
1685 end_buf, &iwe, buf);
1686 if (IS_ERR(current_ev))
1687 goto unlock;
1688
1689 current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
1690
1691 unlock:
1692 rcu_read_unlock();
1693 return current_ev;
1694}
1695
1696
1697static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
1698 struct iw_request_info *info,
1699 char *buf, size_t len)
1700{
1701 char *current_ev = buf;
1702 char *end_buf = buf + len;
1703 struct cfg80211_internal_bss *bss;
1704 int err = 0;
1705
1706 spin_lock_bh(&rdev->bss_lock);
1707 cfg80211_bss_expire(rdev);
1708
1709 list_for_each_entry(bss, &rdev->bss_list, list) {
1710 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
1711 err = -E2BIG;
1712 break;
1713 }
1714 current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
1715 current_ev, end_buf);
1716 if (IS_ERR(current_ev)) {
1717 err = PTR_ERR(current_ev);
1718 break;
1719 }
1720 }
1721 spin_unlock_bh(&rdev->bss_lock);
1722
1723 if (err)
1724 return err;
1725 return current_ev - buf;
1726}
1727
1728
1729int cfg80211_wext_giwscan(struct net_device *dev,
1730 struct iw_request_info *info,
1731 struct iw_point *data, char *extra)
1732{
1733 struct cfg80211_registered_device *rdev;
1734 int res;
1735
1736 if (!netif_running(dev))
1737 return -ENETDOWN;
1738
1739 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1740
1741 if (IS_ERR(rdev))
1742 return PTR_ERR(rdev);
1743
1744 if (rdev->scan_req || rdev->scan_msg)
1745 return -EAGAIN;
1746
1747 res = ieee80211_scan_results(rdev, info, extra, data->length);
1748 data->length = 0;
1749 if (res >= 0) {
1750 data->length = res;
1751 res = 0;
1752 }
1753
1754 return res;
1755}
1756EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan);
1757#endif
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
61static 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
85static 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
99static 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
118static 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
143static 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
165void ___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
227void __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
239void 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}
248EXPORT_SYMBOL(cfg80211_scan_done);
249
250void __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 = jiffies;
270 }
271 nl80211_send_sched_scan_results(rdev, request->dev);
272 }
273
274 rtnl_unlock();
275}
276
277void cfg80211_sched_scan_results(struct wiphy *wiphy)
278{
279 trace_cfg80211_sched_scan_results(wiphy);
280 /* ignore if we're not scanning */
281
282 if (rcu_access_pointer(wiphy_to_rdev(wiphy)->sched_scan_req))
283 queue_work(cfg80211_wq,
284 &wiphy_to_rdev(wiphy)->sched_scan_results_wk);
285}
286EXPORT_SYMBOL(cfg80211_sched_scan_results);
287
288void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy)
289{
290 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
291
292 ASSERT_RTNL();
293
294 trace_cfg80211_sched_scan_stopped(wiphy);
295
296 __cfg80211_stop_sched_scan(rdev, true);
297}
298EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl);
299
300void cfg80211_sched_scan_stopped(struct wiphy *wiphy)
301{
302 rtnl_lock();
303 cfg80211_sched_scan_stopped_rtnl(wiphy);
304 rtnl_unlock();
305}
306EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
307
308int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
309 bool driver_initiated)
310{
311 struct cfg80211_sched_scan_request *sched_scan_req;
312 struct net_device *dev;
313
314 ASSERT_RTNL();
315
316 if (!rdev->sched_scan_req)
317 return -ENOENT;
318
319 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
320 dev = sched_scan_req->dev;
321
322 if (!driver_initiated) {
323 int err = rdev_sched_scan_stop(rdev, dev);
324 if (err)
325 return err;
326 }
327
328 nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED);
329
330 RCU_INIT_POINTER(rdev->sched_scan_req, NULL);
331 kfree_rcu(sched_scan_req, rcu_head);
332
333 return 0;
334}
335
336void cfg80211_bss_age(struct cfg80211_registered_device *rdev,
337 unsigned long age_secs)
338{
339 struct cfg80211_internal_bss *bss;
340 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
341
342 spin_lock_bh(&rdev->bss_lock);
343 list_for_each_entry(bss, &rdev->bss_list, list)
344 bss->ts -= age_jiffies;
345 spin_unlock_bh(&rdev->bss_lock);
346}
347
348void cfg80211_bss_expire(struct cfg80211_registered_device *rdev)
349{
350 __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
351}
352
353const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len)
354{
355 while (len > 2 && ies[0] != eid) {
356 len -= ies[1] + 2;
357 ies += ies[1] + 2;
358 }
359 if (len < 2)
360 return NULL;
361 if (len < 2 + ies[1])
362 return NULL;
363 return ies;
364}
365EXPORT_SYMBOL(cfg80211_find_ie);
366
367const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type,
368 const u8 *ies, int len)
369{
370 struct ieee80211_vendor_ie *ie;
371 const u8 *pos = ies, *end = ies + len;
372 int ie_oui;
373
374 while (pos < end) {
375 pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos,
376 end - pos);
377 if (!pos)
378 return NULL;
379
380 ie = (struct ieee80211_vendor_ie *)pos;
381
382 /* make sure we can access ie->len */
383 BUILD_BUG_ON(offsetof(struct ieee80211_vendor_ie, len) != 1);
384
385 if (ie->len < sizeof(*ie))
386 goto cont;
387
388 ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2];
389 if (ie_oui == oui && ie->oui_type == oui_type)
390 return pos;
391cont:
392 pos += 2 + ie->len;
393 }
394 return NULL;
395}
396EXPORT_SYMBOL(cfg80211_find_vendor_ie);
397
398static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
399 const u8 *ssid, size_t ssid_len)
400{
401 const struct cfg80211_bss_ies *ies;
402 const u8 *ssidie;
403
404 if (bssid && !ether_addr_equal(a->bssid, bssid))
405 return false;
406
407 if (!ssid)
408 return true;
409
410 ies = rcu_access_pointer(a->ies);
411 if (!ies)
412 return false;
413 ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
414 if (!ssidie)
415 return false;
416 if (ssidie[1] != ssid_len)
417 return false;
418 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
419}
420
421/**
422 * enum bss_compare_mode - BSS compare mode
423 * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
424 * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
425 * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
426 */
427enum bss_compare_mode {
428 BSS_CMP_REGULAR,
429 BSS_CMP_HIDE_ZLEN,
430 BSS_CMP_HIDE_NUL,
431};
432
433static int cmp_bss(struct cfg80211_bss *a,
434 struct cfg80211_bss *b,
435 enum bss_compare_mode mode)
436{
437 const struct cfg80211_bss_ies *a_ies, *b_ies;
438 const u8 *ie1 = NULL;
439 const u8 *ie2 = NULL;
440 int i, r;
441
442 if (a->channel != b->channel)
443 return b->channel->center_freq - a->channel->center_freq;
444
445 a_ies = rcu_access_pointer(a->ies);
446 if (!a_ies)
447 return -1;
448 b_ies = rcu_access_pointer(b->ies);
449 if (!b_ies)
450 return 1;
451
452 if (WLAN_CAPABILITY_IS_STA_BSS(a->capability))
453 ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID,
454 a_ies->data, a_ies->len);
455 if (WLAN_CAPABILITY_IS_STA_BSS(b->capability))
456 ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID,
457 b_ies->data, b_ies->len);
458 if (ie1 && ie2) {
459 int mesh_id_cmp;
460
461 if (ie1[1] == ie2[1])
462 mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]);
463 else
464 mesh_id_cmp = ie2[1] - ie1[1];
465
466 ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
467 a_ies->data, a_ies->len);
468 ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
469 b_ies->data, b_ies->len);
470 if (ie1 && ie2) {
471 if (mesh_id_cmp)
472 return mesh_id_cmp;
473 if (ie1[1] != ie2[1])
474 return ie2[1] - ie1[1];
475 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
476 }
477 }
478
479 r = memcmp(a->bssid, b->bssid, sizeof(a->bssid));
480 if (r)
481 return r;
482
483 ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
484 ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
485
486 if (!ie1 && !ie2)
487 return 0;
488
489 /*
490 * Note that with "hide_ssid", the function returns a match if
491 * the already-present BSS ("b") is a hidden SSID beacon for
492 * the new BSS ("a").
493 */
494
495 /* sort missing IE before (left of) present IE */
496 if (!ie1)
497 return -1;
498 if (!ie2)
499 return 1;
500
501 switch (mode) {
502 case BSS_CMP_HIDE_ZLEN:
503 /*
504 * In ZLEN mode we assume the BSS entry we're
505 * looking for has a zero-length SSID. So if
506 * the one we're looking at right now has that,
507 * return 0. Otherwise, return the difference
508 * in length, but since we're looking for the
509 * 0-length it's really equivalent to returning
510 * the length of the one we're looking at.
511 *
512 * No content comparison is needed as we assume
513 * the content length is zero.
514 */
515 return ie2[1];
516 case BSS_CMP_REGULAR:
517 default:
518 /* sort by length first, then by contents */
519 if (ie1[1] != ie2[1])
520 return ie2[1] - ie1[1];
521 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
522 case BSS_CMP_HIDE_NUL:
523 if (ie1[1] != ie2[1])
524 return ie2[1] - ie1[1];
525 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */
526 for (i = 0; i < ie2[1]; i++)
527 if (ie2[i + 2])
528 return -1;
529 return 0;
530 }
531}
532
533static bool cfg80211_bss_type_match(u16 capability,
534 enum ieee80211_band band,
535 enum ieee80211_bss_type bss_type)
536{
537 bool ret = true;
538 u16 mask, val;
539
540 if (bss_type == IEEE80211_BSS_TYPE_ANY)
541 return ret;
542
543 if (band == IEEE80211_BAND_60GHZ) {
544 mask = WLAN_CAPABILITY_DMG_TYPE_MASK;
545 switch (bss_type) {
546 case IEEE80211_BSS_TYPE_ESS:
547 val = WLAN_CAPABILITY_DMG_TYPE_AP;
548 break;
549 case IEEE80211_BSS_TYPE_PBSS:
550 val = WLAN_CAPABILITY_DMG_TYPE_PBSS;
551 break;
552 case IEEE80211_BSS_TYPE_IBSS:
553 val = WLAN_CAPABILITY_DMG_TYPE_IBSS;
554 break;
555 default:
556 return false;
557 }
558 } else {
559 mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS;
560 switch (bss_type) {
561 case IEEE80211_BSS_TYPE_ESS:
562 val = WLAN_CAPABILITY_ESS;
563 break;
564 case IEEE80211_BSS_TYPE_IBSS:
565 val = WLAN_CAPABILITY_IBSS;
566 break;
567 case IEEE80211_BSS_TYPE_MBSS:
568 val = 0;
569 break;
570 default:
571 return false;
572 }
573 }
574
575 ret = ((capability & mask) == val);
576 return ret;
577}
578
579/* Returned bss is reference counted and must be cleaned up appropriately. */
580struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
581 struct ieee80211_channel *channel,
582 const u8 *bssid,
583 const u8 *ssid, size_t ssid_len,
584 enum ieee80211_bss_type bss_type,
585 enum ieee80211_privacy privacy)
586{
587 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
588 struct cfg80211_internal_bss *bss, *res = NULL;
589 unsigned long now = jiffies;
590 int bss_privacy;
591
592 trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type,
593 privacy);
594
595 spin_lock_bh(&rdev->bss_lock);
596
597 list_for_each_entry(bss, &rdev->bss_list, list) {
598 if (!cfg80211_bss_type_match(bss->pub.capability,
599 bss->pub.channel->band, bss_type))
600 continue;
601
602 bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY);
603 if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) ||
604 (privacy == IEEE80211_PRIVACY_OFF && bss_privacy))
605 continue;
606 if (channel && bss->pub.channel != channel)
607 continue;
608 if (!is_valid_ether_addr(bss->pub.bssid))
609 continue;
610 /* Don't get expired BSS structs */
611 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
612 !atomic_read(&bss->hold))
613 continue;
614 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
615 res = bss;
616 bss_ref_get(rdev, res);
617 break;
618 }
619 }
620
621 spin_unlock_bh(&rdev->bss_lock);
622 if (!res)
623 return NULL;
624 trace_cfg80211_return_bss(&res->pub);
625 return &res->pub;
626}
627EXPORT_SYMBOL(cfg80211_get_bss);
628
629static void rb_insert_bss(struct cfg80211_registered_device *rdev,
630 struct cfg80211_internal_bss *bss)
631{
632 struct rb_node **p = &rdev->bss_tree.rb_node;
633 struct rb_node *parent = NULL;
634 struct cfg80211_internal_bss *tbss;
635 int cmp;
636
637 while (*p) {
638 parent = *p;
639 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
640
641 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR);
642
643 if (WARN_ON(!cmp)) {
644 /* will sort of leak this BSS */
645 return;
646 }
647
648 if (cmp < 0)
649 p = &(*p)->rb_left;
650 else
651 p = &(*p)->rb_right;
652 }
653
654 rb_link_node(&bss->rbn, parent, p);
655 rb_insert_color(&bss->rbn, &rdev->bss_tree);
656}
657
658static struct cfg80211_internal_bss *
659rb_find_bss(struct cfg80211_registered_device *rdev,
660 struct cfg80211_internal_bss *res,
661 enum bss_compare_mode mode)
662{
663 struct rb_node *n = rdev->bss_tree.rb_node;
664 struct cfg80211_internal_bss *bss;
665 int r;
666
667 while (n) {
668 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
669 r = cmp_bss(&res->pub, &bss->pub, mode);
670
671 if (r == 0)
672 return bss;
673 else if (r < 0)
674 n = n->rb_left;
675 else
676 n = n->rb_right;
677 }
678
679 return NULL;
680}
681
682static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev,
683 struct cfg80211_internal_bss *new)
684{
685 const struct cfg80211_bss_ies *ies;
686 struct cfg80211_internal_bss *bss;
687 const u8 *ie;
688 int i, ssidlen;
689 u8 fold = 0;
690
691 ies = rcu_access_pointer(new->pub.beacon_ies);
692 if (WARN_ON(!ies))
693 return false;
694
695 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
696 if (!ie) {
697 /* nothing to do */
698 return true;
699 }
700
701 ssidlen = ie[1];
702 for (i = 0; i < ssidlen; i++)
703 fold |= ie[2 + i];
704
705 if (fold) {
706 /* not a hidden SSID */
707 return true;
708 }
709
710 /* This is the bad part ... */
711
712 list_for_each_entry(bss, &rdev->bss_list, list) {
713 if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid))
714 continue;
715 if (bss->pub.channel != new->pub.channel)
716 continue;
717 if (bss->pub.scan_width != new->pub.scan_width)
718 continue;
719 if (rcu_access_pointer(bss->pub.beacon_ies))
720 continue;
721 ies = rcu_access_pointer(bss->pub.ies);
722 if (!ies)
723 continue;
724 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
725 if (!ie)
726 continue;
727 if (ssidlen && ie[1] != ssidlen)
728 continue;
729 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss))
730 continue;
731 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list)))
732 list_del(&bss->hidden_list);
733 /* combine them */
734 list_add(&bss->hidden_list, &new->hidden_list);
735 bss->pub.hidden_beacon_bss = &new->pub;
736 new->refcount += bss->refcount;
737 rcu_assign_pointer(bss->pub.beacon_ies,
738 new->pub.beacon_ies);
739 }
740
741 return true;
742}
743
744/* Returned bss is reference counted and must be cleaned up appropriately. */
745static struct cfg80211_internal_bss *
746cfg80211_bss_update(struct cfg80211_registered_device *rdev,
747 struct cfg80211_internal_bss *tmp,
748 bool signal_valid)
749{
750 struct cfg80211_internal_bss *found = NULL;
751
752 if (WARN_ON(!tmp->pub.channel))
753 return NULL;
754
755 tmp->ts = jiffies;
756
757 spin_lock_bh(&rdev->bss_lock);
758
759 if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
760 spin_unlock_bh(&rdev->bss_lock);
761 return NULL;
762 }
763
764 found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR);
765
766 if (found) {
767 /* Update IEs */
768 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
769 const struct cfg80211_bss_ies *old;
770
771 old = rcu_access_pointer(found->pub.proberesp_ies);
772
773 rcu_assign_pointer(found->pub.proberesp_ies,
774 tmp->pub.proberesp_ies);
775 /* Override possible earlier Beacon frame IEs */
776 rcu_assign_pointer(found->pub.ies,
777 tmp->pub.proberesp_ies);
778 if (old)
779 kfree_rcu((struct cfg80211_bss_ies *)old,
780 rcu_head);
781 } else if (rcu_access_pointer(tmp->pub.beacon_ies)) {
782 const struct cfg80211_bss_ies *old;
783 struct cfg80211_internal_bss *bss;
784
785 if (found->pub.hidden_beacon_bss &&
786 !list_empty(&found->hidden_list)) {
787 const struct cfg80211_bss_ies *f;
788
789 /*
790 * The found BSS struct is one of the probe
791 * response members of a group, but we're
792 * receiving a beacon (beacon_ies in the tmp
793 * bss is used). This can only mean that the
794 * AP changed its beacon from not having an
795 * SSID to showing it, which is confusing so
796 * drop this information.
797 */
798
799 f = rcu_access_pointer(tmp->pub.beacon_ies);
800 kfree_rcu((struct cfg80211_bss_ies *)f,
801 rcu_head);
802 goto drop;
803 }
804
805 old = rcu_access_pointer(found->pub.beacon_ies);
806
807 rcu_assign_pointer(found->pub.beacon_ies,
808 tmp->pub.beacon_ies);
809
810 /* Override IEs if they were from a beacon before */
811 if (old == rcu_access_pointer(found->pub.ies))
812 rcu_assign_pointer(found->pub.ies,
813 tmp->pub.beacon_ies);
814
815 /* Assign beacon IEs to all sub entries */
816 list_for_each_entry(bss, &found->hidden_list,
817 hidden_list) {
818 const struct cfg80211_bss_ies *ies;
819
820 ies = rcu_access_pointer(bss->pub.beacon_ies);
821 WARN_ON(ies != old);
822
823 rcu_assign_pointer(bss->pub.beacon_ies,
824 tmp->pub.beacon_ies);
825 }
826
827 if (old)
828 kfree_rcu((struct cfg80211_bss_ies *)old,
829 rcu_head);
830 }
831
832 found->pub.beacon_interval = tmp->pub.beacon_interval;
833 /*
834 * don't update the signal if beacon was heard on
835 * adjacent channel.
836 */
837 if (signal_valid)
838 found->pub.signal = tmp->pub.signal;
839 found->pub.capability = tmp->pub.capability;
840 found->ts = tmp->ts;
841 found->ts_boottime = tmp->ts_boottime;
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
908static struct ieee80211_channel *
909cfg80211_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. */
941struct cfg80211_bss *
942cfg80211_inform_bss_data(struct wiphy *wiphy,
943 struct cfg80211_inform_bss *data,
944 enum cfg80211_bss_frame_type ftype,
945 const u8 *bssid, u64 tsf, u16 capability,
946 u16 beacon_interval, const u8 *ie, size_t ielen,
947 gfp_t gfp)
948{
949 struct cfg80211_bss_ies *ies;
950 struct ieee80211_channel *channel;
951 struct cfg80211_internal_bss tmp = {}, *res;
952 int bss_type;
953 bool signal_valid;
954
955 if (WARN_ON(!wiphy))
956 return NULL;
957
958 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
959 (data->signal < 0 || data->signal > 100)))
960 return NULL;
961
962 channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan);
963 if (!channel)
964 return NULL;
965
966 memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
967 tmp.pub.channel = channel;
968 tmp.pub.scan_width = data->scan_width;
969 tmp.pub.signal = data->signal;
970 tmp.pub.beacon_interval = beacon_interval;
971 tmp.pub.capability = capability;
972 tmp.ts_boottime = data->boottime_ns;
973
974 /*
975 * If we do not know here whether the IEs are from a Beacon or Probe
976 * Response frame, we need to pick one of the options and only use it
977 * with the driver that does not provide the full Beacon/Probe Response
978 * frame. Use Beacon frame pointer to avoid indicating that this should
979 * override the IEs pointer should we have received an earlier
980 * indication of Probe Response data.
981 */
982 ies = kzalloc(sizeof(*ies) + ielen, gfp);
983 if (!ies)
984 return NULL;
985 ies->len = ielen;
986 ies->tsf = tsf;
987 ies->from_beacon = false;
988 memcpy(ies->data, ie, ielen);
989
990 switch (ftype) {
991 case CFG80211_BSS_FTYPE_BEACON:
992 ies->from_beacon = true;
993 /* fall through to assign */
994 case CFG80211_BSS_FTYPE_UNKNOWN:
995 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
996 break;
997 case CFG80211_BSS_FTYPE_PRESP:
998 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
999 break;
1000 }
1001 rcu_assign_pointer(tmp.pub.ies, ies);
1002
1003 signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
1004 wiphy->max_adj_channel_rssi_comp;
1005 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
1006 if (!res)
1007 return NULL;
1008
1009 if (channel->band == IEEE80211_BAND_60GHZ) {
1010 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1011 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1012 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1013 regulatory_hint_found_beacon(wiphy, channel, gfp);
1014 } else {
1015 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1016 regulatory_hint_found_beacon(wiphy, channel, gfp);
1017 }
1018
1019 trace_cfg80211_return_bss(&res->pub);
1020 /* cfg80211_bss_update gives us a referenced result */
1021 return &res->pub;
1022}
1023EXPORT_SYMBOL(cfg80211_inform_bss_data);
1024
1025/* cfg80211_inform_bss_width_frame helper */
1026struct cfg80211_bss *
1027cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
1028 struct cfg80211_inform_bss *data,
1029 struct ieee80211_mgmt *mgmt, size_t len,
1030 gfp_t gfp)
1031
1032{
1033 struct cfg80211_internal_bss tmp = {}, *res;
1034 struct cfg80211_bss_ies *ies;
1035 struct ieee80211_channel *channel;
1036 bool signal_valid;
1037 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1038 u.probe_resp.variable);
1039 int bss_type;
1040
1041 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
1042 offsetof(struct ieee80211_mgmt, u.beacon.variable));
1043
1044 trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len);
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 (data->signal < 0 || data->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, data->chan);
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 = data->scan_width;
1081 tmp.pub.signal = data->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 tmp.ts_boottime = data->boottime_ns;
1085
1086 signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
1087 wiphy->max_adj_channel_rssi_comp;
1088 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
1089 if (!res)
1090 return NULL;
1091
1092 if (channel->band == IEEE80211_BAND_60GHZ) {
1093 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1094 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1095 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1096 regulatory_hint_found_beacon(wiphy, channel, gfp);
1097 } else {
1098 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1099 regulatory_hint_found_beacon(wiphy, channel, gfp);
1100 }
1101
1102 trace_cfg80211_return_bss(&res->pub);
1103 /* cfg80211_bss_update gives us a referenced result */
1104 return &res->pub;
1105}
1106EXPORT_SYMBOL(cfg80211_inform_bss_frame_data);
1107
1108void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1109{
1110 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1111 struct cfg80211_internal_bss *bss;
1112
1113 if (!pub)
1114 return;
1115
1116 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1117
1118 spin_lock_bh(&rdev->bss_lock);
1119 bss_ref_get(rdev, bss);
1120 spin_unlock_bh(&rdev->bss_lock);
1121}
1122EXPORT_SYMBOL(cfg80211_ref_bss);
1123
1124void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1125{
1126 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1127 struct cfg80211_internal_bss *bss;
1128
1129 if (!pub)
1130 return;
1131
1132 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1133
1134 spin_lock_bh(&rdev->bss_lock);
1135 bss_ref_put(rdev, bss);
1136 spin_unlock_bh(&rdev->bss_lock);
1137}
1138EXPORT_SYMBOL(cfg80211_put_bss);
1139
1140void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1141{
1142 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1143 struct cfg80211_internal_bss *bss;
1144
1145 if (WARN_ON(!pub))
1146 return;
1147
1148 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1149
1150 spin_lock_bh(&rdev->bss_lock);
1151 if (!list_empty(&bss->list)) {
1152 if (__cfg80211_unlink_bss(rdev, bss))
1153 rdev->bss_generation++;
1154 }
1155 spin_unlock_bh(&rdev->bss_lock);
1156}
1157EXPORT_SYMBOL(cfg80211_unlink_bss);
1158
1159#ifdef CONFIG_CFG80211_WEXT
1160static struct cfg80211_registered_device *
1161cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
1162{
1163 struct cfg80211_registered_device *rdev;
1164 struct net_device *dev;
1165
1166 ASSERT_RTNL();
1167
1168 dev = dev_get_by_index(net, ifindex);
1169 if (!dev)
1170 return ERR_PTR(-ENODEV);
1171 if (dev->ieee80211_ptr)
1172 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
1173 else
1174 rdev = ERR_PTR(-ENODEV);
1175 dev_put(dev);
1176 return rdev;
1177}
1178
1179int cfg80211_wext_siwscan(struct net_device *dev,
1180 struct iw_request_info *info,
1181 union iwreq_data *wrqu, char *extra)
1182{
1183 struct cfg80211_registered_device *rdev;
1184 struct wiphy *wiphy;
1185 struct iw_scan_req *wreq = NULL;
1186 struct cfg80211_scan_request *creq = NULL;
1187 int i, err, n_channels = 0;
1188 enum ieee80211_band band;
1189
1190 if (!netif_running(dev))
1191 return -ENETDOWN;
1192
1193 if (wrqu->data.length == sizeof(struct iw_scan_req))
1194 wreq = (struct iw_scan_req *)extra;
1195
1196 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1197
1198 if (IS_ERR(rdev))
1199 return PTR_ERR(rdev);
1200
1201 if (rdev->scan_req || rdev->scan_msg) {
1202 err = -EBUSY;
1203 goto out;
1204 }
1205
1206 wiphy = &rdev->wiphy;
1207
1208 /* Determine number of channels, needed to allocate creq */
1209 if (wreq && wreq->num_channels)
1210 n_channels = wreq->num_channels;
1211 else
1212 n_channels = ieee80211_get_num_supported_channels(wiphy);
1213
1214 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
1215 n_channels * sizeof(void *),
1216 GFP_ATOMIC);
1217 if (!creq) {
1218 err = -ENOMEM;
1219 goto out;
1220 }
1221
1222 creq->wiphy = wiphy;
1223 creq->wdev = dev->ieee80211_ptr;
1224 /* SSIDs come after channels */
1225 creq->ssids = (void *)&creq->channels[n_channels];
1226 creq->n_channels = n_channels;
1227 creq->n_ssids = 1;
1228 creq->scan_start = jiffies;
1229
1230 /* translate "Scan on frequencies" request */
1231 i = 0;
1232 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1233 int j;
1234
1235 if (!wiphy->bands[band])
1236 continue;
1237
1238 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
1239 /* ignore disabled channels */
1240 if (wiphy->bands[band]->channels[j].flags &
1241 IEEE80211_CHAN_DISABLED)
1242 continue;
1243
1244 /* If we have a wireless request structure and the
1245 * wireless request specifies frequencies, then search
1246 * for the matching hardware channel.
1247 */
1248 if (wreq && wreq->num_channels) {
1249 int k;
1250 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
1251 for (k = 0; k < wreq->num_channels; k++) {
1252 struct iw_freq *freq =
1253 &wreq->channel_list[k];
1254 int wext_freq =
1255 cfg80211_wext_freq(freq);
1256
1257 if (wext_freq == wiphy_freq)
1258 goto wext_freq_found;
1259 }
1260 goto wext_freq_not_found;
1261 }
1262
1263 wext_freq_found:
1264 creq->channels[i] = &wiphy->bands[band]->channels[j];
1265 i++;
1266 wext_freq_not_found: ;
1267 }
1268 }
1269 /* No channels found? */
1270 if (!i) {
1271 err = -EINVAL;
1272 goto out;
1273 }
1274
1275 /* Set real number of channels specified in creq->channels[] */
1276 creq->n_channels = i;
1277
1278 /* translate "Scan for SSID" request */
1279 if (wreq) {
1280 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
1281 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
1282 err = -EINVAL;
1283 goto out;
1284 }
1285 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
1286 creq->ssids[0].ssid_len = wreq->essid_len;
1287 }
1288 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
1289 creq->n_ssids = 0;
1290 }
1291
1292 for (i = 0; i < IEEE80211_NUM_BANDS; i++)
1293 if (wiphy->bands[i])
1294 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
1295
1296 rdev->scan_req = creq;
1297 err = rdev_scan(rdev, creq);
1298 if (err) {
1299 rdev->scan_req = NULL;
1300 /* creq will be freed below */
1301 } else {
1302 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
1303 /* creq now owned by driver */
1304 creq = NULL;
1305 dev_hold(dev);
1306 }
1307 out:
1308 kfree(creq);
1309 return err;
1310}
1311EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
1312
1313static char *ieee80211_scan_add_ies(struct iw_request_info *info,
1314 const struct cfg80211_bss_ies *ies,
1315 char *current_ev, char *end_buf)
1316{
1317 const u8 *pos, *end, *next;
1318 struct iw_event iwe;
1319
1320 if (!ies)
1321 return current_ev;
1322
1323 /*
1324 * If needed, fragment the IEs buffer (at IE boundaries) into short
1325 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
1326 */
1327 pos = ies->data;
1328 end = pos + ies->len;
1329
1330 while (end - pos > IW_GENERIC_IE_MAX) {
1331 next = pos + 2 + pos[1];
1332 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
1333 next = next + 2 + next[1];
1334
1335 memset(&iwe, 0, sizeof(iwe));
1336 iwe.cmd = IWEVGENIE;
1337 iwe.u.data.length = next - pos;
1338 current_ev = iwe_stream_add_point_check(info, current_ev,
1339 end_buf, &iwe,
1340 (void *)pos);
1341 if (IS_ERR(current_ev))
1342 return current_ev;
1343 pos = next;
1344 }
1345
1346 if (end > pos) {
1347 memset(&iwe, 0, sizeof(iwe));
1348 iwe.cmd = IWEVGENIE;
1349 iwe.u.data.length = end - pos;
1350 current_ev = iwe_stream_add_point_check(info, current_ev,
1351 end_buf, &iwe,
1352 (void *)pos);
1353 if (IS_ERR(current_ev))
1354 return current_ev;
1355 }
1356
1357 return current_ev;
1358}
1359
1360static char *
1361ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
1362 struct cfg80211_internal_bss *bss, char *current_ev,
1363 char *end_buf)
1364{
1365 const struct cfg80211_bss_ies *ies;
1366 struct iw_event iwe;
1367 const u8 *ie;
1368 u8 buf[50];
1369 u8 *cfg, *p, *tmp;
1370 int rem, i, sig;
1371 bool ismesh = false;
1372
1373 memset(&iwe, 0, sizeof(iwe));
1374 iwe.cmd = SIOCGIWAP;
1375 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1376 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
1377 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
1378 IW_EV_ADDR_LEN);
1379 if (IS_ERR(current_ev))
1380 return current_ev;
1381
1382 memset(&iwe, 0, sizeof(iwe));
1383 iwe.cmd = SIOCGIWFREQ;
1384 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
1385 iwe.u.freq.e = 0;
1386 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
1387 IW_EV_FREQ_LEN);
1388 if (IS_ERR(current_ev))
1389 return current_ev;
1390
1391 memset(&iwe, 0, sizeof(iwe));
1392 iwe.cmd = SIOCGIWFREQ;
1393 iwe.u.freq.m = bss->pub.channel->center_freq;
1394 iwe.u.freq.e = 6;
1395 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
1396 IW_EV_FREQ_LEN);
1397 if (IS_ERR(current_ev))
1398 return current_ev;
1399
1400 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
1401 memset(&iwe, 0, sizeof(iwe));
1402 iwe.cmd = IWEVQUAL;
1403 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
1404 IW_QUAL_NOISE_INVALID |
1405 IW_QUAL_QUAL_UPDATED;
1406 switch (wiphy->signal_type) {
1407 case CFG80211_SIGNAL_TYPE_MBM:
1408 sig = bss->pub.signal / 100;
1409 iwe.u.qual.level = sig;
1410 iwe.u.qual.updated |= IW_QUAL_DBM;
1411 if (sig < -110) /* rather bad */
1412 sig = -110;
1413 else if (sig > -40) /* perfect */
1414 sig = -40;
1415 /* will give a range of 0 .. 70 */
1416 iwe.u.qual.qual = sig + 110;
1417 break;
1418 case CFG80211_SIGNAL_TYPE_UNSPEC:
1419 iwe.u.qual.level = bss->pub.signal;
1420 /* will give range 0 .. 100 */
1421 iwe.u.qual.qual = bss->pub.signal;
1422 break;
1423 default:
1424 /* not reached */
1425 break;
1426 }
1427 current_ev = iwe_stream_add_event_check(info, current_ev,
1428 end_buf, &iwe,
1429 IW_EV_QUAL_LEN);
1430 if (IS_ERR(current_ev))
1431 return current_ev;
1432 }
1433
1434 memset(&iwe, 0, sizeof(iwe));
1435 iwe.cmd = SIOCGIWENCODE;
1436 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
1437 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1438 else
1439 iwe.u.data.flags = IW_ENCODE_DISABLED;
1440 iwe.u.data.length = 0;
1441 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
1442 &iwe, "");
1443 if (IS_ERR(current_ev))
1444 return current_ev;
1445
1446 rcu_read_lock();
1447 ies = rcu_dereference(bss->pub.ies);
1448 rem = ies->len;
1449 ie = ies->data;
1450
1451 while (rem >= 2) {
1452 /* invalid data */
1453 if (ie[1] > rem - 2)
1454 break;
1455
1456 switch (ie[0]) {
1457 case WLAN_EID_SSID:
1458 memset(&iwe, 0, sizeof(iwe));
1459 iwe.cmd = SIOCGIWESSID;
1460 iwe.u.data.length = ie[1];
1461 iwe.u.data.flags = 1;
1462 current_ev = iwe_stream_add_point_check(info,
1463 current_ev,
1464 end_buf, &iwe,
1465 (u8 *)ie + 2);
1466 if (IS_ERR(current_ev))
1467 goto unlock;
1468 break;
1469 case WLAN_EID_MESH_ID:
1470 memset(&iwe, 0, sizeof(iwe));
1471 iwe.cmd = SIOCGIWESSID;
1472 iwe.u.data.length = ie[1];
1473 iwe.u.data.flags = 1;
1474 current_ev = iwe_stream_add_point_check(info,
1475 current_ev,
1476 end_buf, &iwe,
1477 (u8 *)ie + 2);
1478 if (IS_ERR(current_ev))
1479 goto unlock;
1480 break;
1481 case WLAN_EID_MESH_CONFIG:
1482 ismesh = true;
1483 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
1484 break;
1485 cfg = (u8 *)ie + 2;
1486 memset(&iwe, 0, sizeof(iwe));
1487 iwe.cmd = IWEVCUSTOM;
1488 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
1489 "0x%02X", cfg[0]);
1490 iwe.u.data.length = strlen(buf);
1491 current_ev = iwe_stream_add_point_check(info,
1492 current_ev,
1493 end_buf,
1494 &iwe, buf);
1495 if (IS_ERR(current_ev))
1496 goto unlock;
1497 sprintf(buf, "Path Selection Metric ID: 0x%02X",
1498 cfg[1]);
1499 iwe.u.data.length = strlen(buf);
1500 current_ev = iwe_stream_add_point_check(info,
1501 current_ev,
1502 end_buf,
1503 &iwe, buf);
1504 if (IS_ERR(current_ev))
1505 goto unlock;
1506 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
1507 cfg[2]);
1508 iwe.u.data.length = strlen(buf);
1509 current_ev = iwe_stream_add_point_check(info,
1510 current_ev,
1511 end_buf,
1512 &iwe, buf);
1513 if (IS_ERR(current_ev))
1514 goto unlock;
1515 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
1516 iwe.u.data.length = strlen(buf);
1517 current_ev = iwe_stream_add_point_check(info,
1518 current_ev,
1519 end_buf,
1520 &iwe, buf);
1521 if (IS_ERR(current_ev))
1522 goto unlock;
1523 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
1524 iwe.u.data.length = strlen(buf);
1525 current_ev = iwe_stream_add_point_check(info,
1526 current_ev,
1527 end_buf,
1528 &iwe, buf);
1529 if (IS_ERR(current_ev))
1530 goto unlock;
1531 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
1532 iwe.u.data.length = strlen(buf);
1533 current_ev = iwe_stream_add_point_check(info,
1534 current_ev,
1535 end_buf,
1536 &iwe, buf);
1537 if (IS_ERR(current_ev))
1538 goto unlock;
1539 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
1540 iwe.u.data.length = strlen(buf);
1541 current_ev = iwe_stream_add_point_check(info,
1542 current_ev,
1543 end_buf,
1544 &iwe, buf);
1545 if (IS_ERR(current_ev))
1546 goto unlock;
1547 break;
1548 case WLAN_EID_SUPP_RATES:
1549 case WLAN_EID_EXT_SUPP_RATES:
1550 /* display all supported rates in readable format */
1551 p = current_ev + iwe_stream_lcp_len(info);
1552
1553 memset(&iwe, 0, sizeof(iwe));
1554 iwe.cmd = SIOCGIWRATE;
1555 /* Those two flags are ignored... */
1556 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
1557
1558 for (i = 0; i < ie[1]; i++) {
1559 iwe.u.bitrate.value =
1560 ((ie[i + 2] & 0x7f) * 500000);
1561 tmp = p;
1562 p = iwe_stream_add_value(info, current_ev, p,
1563 end_buf, &iwe,
1564 IW_EV_PARAM_LEN);
1565 if (p == tmp) {
1566 current_ev = ERR_PTR(-E2BIG);
1567 goto unlock;
1568 }
1569 }
1570 current_ev = p;
1571 break;
1572 }
1573 rem -= ie[1] + 2;
1574 ie += ie[1] + 2;
1575 }
1576
1577 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
1578 ismesh) {
1579 memset(&iwe, 0, sizeof(iwe));
1580 iwe.cmd = SIOCGIWMODE;
1581 if (ismesh)
1582 iwe.u.mode = IW_MODE_MESH;
1583 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
1584 iwe.u.mode = IW_MODE_MASTER;
1585 else
1586 iwe.u.mode = IW_MODE_ADHOC;
1587 current_ev = iwe_stream_add_event_check(info, current_ev,
1588 end_buf, &iwe,
1589 IW_EV_UINT_LEN);
1590 if (IS_ERR(current_ev))
1591 goto unlock;
1592 }
1593
1594 memset(&iwe, 0, sizeof(iwe));
1595 iwe.cmd = IWEVCUSTOM;
1596 sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
1597 iwe.u.data.length = strlen(buf);
1598 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
1599 &iwe, buf);
1600 if (IS_ERR(current_ev))
1601 goto unlock;
1602 memset(&iwe, 0, sizeof(iwe));
1603 iwe.cmd = IWEVCUSTOM;
1604 sprintf(buf, " Last beacon: %ums ago",
1605 elapsed_jiffies_msecs(bss->ts));
1606 iwe.u.data.length = strlen(buf);
1607 current_ev = iwe_stream_add_point_check(info, current_ev,
1608 end_buf, &iwe, buf);
1609 if (IS_ERR(current_ev))
1610 goto unlock;
1611
1612 current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
1613
1614 unlock:
1615 rcu_read_unlock();
1616 return current_ev;
1617}
1618
1619
1620static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
1621 struct iw_request_info *info,
1622 char *buf, size_t len)
1623{
1624 char *current_ev = buf;
1625 char *end_buf = buf + len;
1626 struct cfg80211_internal_bss *bss;
1627 int err = 0;
1628
1629 spin_lock_bh(&rdev->bss_lock);
1630 cfg80211_bss_expire(rdev);
1631
1632 list_for_each_entry(bss, &rdev->bss_list, list) {
1633 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
1634 err = -E2BIG;
1635 break;
1636 }
1637 current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
1638 current_ev, end_buf);
1639 if (IS_ERR(current_ev)) {
1640 err = PTR_ERR(current_ev);
1641 break;
1642 }
1643 }
1644 spin_unlock_bh(&rdev->bss_lock);
1645
1646 if (err)
1647 return err;
1648 return current_ev - buf;
1649}
1650
1651
1652int cfg80211_wext_giwscan(struct net_device *dev,
1653 struct iw_request_info *info,
1654 struct iw_point *data, char *extra)
1655{
1656 struct cfg80211_registered_device *rdev;
1657 int res;
1658
1659 if (!netif_running(dev))
1660 return -ENETDOWN;
1661
1662 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1663
1664 if (IS_ERR(rdev))
1665 return PTR_ERR(rdev);
1666
1667 if (rdev->scan_req || rdev->scan_msg)
1668 return -EAGAIN;
1669
1670 res = ieee80211_scan_results(rdev, info, extra, data->length);
1671 data->length = 0;
1672 if (res >= 0) {
1673 data->length = res;
1674 res = 0;
1675 }
1676
1677 return res;
1678}
1679EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan);
1680#endif