2 * cfg80211 scan result handling
4 * Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
5 * Copyright 2013-2014 Intel Mobile Communications GmbH
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>
15 #include <net/cfg80211.h>
16 #include <net/cfg80211-wext.h>
17 #include <net/iw_handler.h>
20 #include "wext-compat.h"
24 * DOC: BSS tree/list structure
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
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.
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.
49 * Note that the hidden_beacon_bss pointer never changes, due to
50 * the reference counting. Therefore, no locking is needed for
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.
60 * Limit the number of BSS entries stored in mac80211. Each one is
61 * a bit over 4k at most, so this limits to roughly 4-5M of memory.
62 * If somebody wants to really attack this though, they'd likely
63 * use small beacons, and only one type of frame, limiting each of
64 * the entries to a much smaller size (in order to generate more
65 * entries in total, so overhead is bigger.)
67 static int bss_entries_limit = 1000;
68 module_param(bss_entries_limit, int, 0644);
69 MODULE_PARM_DESC(bss_entries_limit,
70 "limit to number of scan BSS entries (per wiphy, default 1000)");
72 #define IEEE80211_SCAN_RESULT_EXPIRE (7 * HZ)
74 static void bss_free(struct cfg80211_internal_bss *bss)
76 struct cfg80211_bss_ies *ies;
78 if (WARN_ON(atomic_read(&bss->hold)))
81 ies = (void *)rcu_access_pointer(bss->pub.beacon_ies);
82 if (ies && !bss->pub.hidden_beacon_bss)
83 kfree_rcu(ies, rcu_head);
84 ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies);
86 kfree_rcu(ies, rcu_head);
89 * This happens when the module is removed, it doesn't
90 * really matter any more save for completeness
92 if (!list_empty(&bss->hidden_list))
93 list_del(&bss->hidden_list);
98 static inline void bss_ref_get(struct cfg80211_registered_device *rdev,
99 struct cfg80211_internal_bss *bss)
101 lockdep_assert_held(&rdev->bss_lock);
104 if (bss->pub.hidden_beacon_bss) {
105 bss = container_of(bss->pub.hidden_beacon_bss,
106 struct cfg80211_internal_bss,
112 static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
113 struct cfg80211_internal_bss *bss)
115 lockdep_assert_held(&rdev->bss_lock);
117 if (bss->pub.hidden_beacon_bss) {
118 struct cfg80211_internal_bss *hbss;
119 hbss = container_of(bss->pub.hidden_beacon_bss,
120 struct cfg80211_internal_bss,
123 if (hbss->refcount == 0)
127 if (bss->refcount == 0)
131 static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev,
132 struct cfg80211_internal_bss *bss)
134 lockdep_assert_held(&rdev->bss_lock);
136 if (!list_empty(&bss->hidden_list)) {
138 * don't remove the beacon entry if it has
139 * probe responses associated with it
141 if (!bss->pub.hidden_beacon_bss)
144 * if it's a probe response entry break its
145 * link to the other entries in the group
147 list_del_init(&bss->hidden_list);
150 list_del_init(&bss->list);
151 rb_erase(&bss->rbn, &rdev->bss_tree);
153 WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list),
154 "rdev bss entries[%d]/list[empty:%d] corruption\n",
155 rdev->bss_entries, list_empty(&rdev->bss_list));
156 bss_ref_put(rdev, bss);
160 static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev,
161 unsigned long expire_time)
163 struct cfg80211_internal_bss *bss, *tmp;
164 bool expired = false;
166 lockdep_assert_held(&rdev->bss_lock);
168 list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) {
169 if (atomic_read(&bss->hold))
171 if (!time_after(expire_time, bss->ts))
174 if (__cfg80211_unlink_bss(rdev, bss))
179 rdev->bss_generation++;
182 static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev)
184 struct cfg80211_internal_bss *bss, *oldest = NULL;
187 lockdep_assert_held(&rdev->bss_lock);
189 list_for_each_entry(bss, &rdev->bss_list, list) {
190 if (atomic_read(&bss->hold))
193 if (!list_empty(&bss->hidden_list) &&
194 !bss->pub.hidden_beacon_bss)
197 if (oldest && time_before(oldest->ts, bss->ts))
202 if (WARN_ON(!oldest))
206 * The callers make sure to increase rdev->bss_generation if anything
207 * gets removed (and a new entry added), so there's no need to also do
211 ret = __cfg80211_unlink_bss(rdev, oldest);
216 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
219 struct cfg80211_scan_request *request;
220 struct wireless_dev *wdev;
222 #ifdef CONFIG_CFG80211_WEXT
223 union iwreq_data wrqu;
228 if (rdev->scan_msg) {
229 nl80211_send_scan_result(rdev, rdev->scan_msg);
230 rdev->scan_msg = NULL;
234 request = rdev->scan_req;
238 wdev = request->wdev;
241 * This must be before sending the other events!
242 * Otherwise, wpa_supplicant gets completely confused with
246 cfg80211_sme_scan_done(wdev->netdev);
248 if (!request->aborted &&
249 request->flags & NL80211_SCAN_FLAG_FLUSH) {
250 /* flush entries from previous scans */
251 spin_lock_bh(&rdev->bss_lock);
252 __cfg80211_bss_expire(rdev, request->scan_start);
253 spin_unlock_bh(&rdev->bss_lock);
256 msg = nl80211_build_scan_msg(rdev, wdev, request->aborted);
258 #ifdef CONFIG_CFG80211_WEXT
259 if (wdev->netdev && !request->aborted) {
260 memset(&wrqu, 0, sizeof(wrqu));
262 wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
267 dev_put(wdev->netdev);
269 rdev->scan_req = NULL;
273 rdev->scan_msg = msg;
275 nl80211_send_scan_result(rdev, msg);
278 void __cfg80211_scan_done(struct work_struct *wk)
280 struct cfg80211_registered_device *rdev;
282 rdev = container_of(wk, struct cfg80211_registered_device,
286 ___cfg80211_scan_done(rdev, true);
290 void cfg80211_scan_done(struct cfg80211_scan_request *request, bool aborted)
292 trace_cfg80211_scan_done(request, aborted);
293 WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req);
295 request->aborted = aborted;
296 request->notified = true;
297 queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk);
299 EXPORT_SYMBOL(cfg80211_scan_done);
301 void __cfg80211_sched_scan_results(struct work_struct *wk)
303 struct cfg80211_registered_device *rdev;
304 struct cfg80211_sched_scan_request *request;
306 rdev = container_of(wk, struct cfg80211_registered_device,
307 sched_scan_results_wk);
311 request = rtnl_dereference(rdev->sched_scan_req);
313 /* we don't have sched_scan_req anymore if the scan is stopping */
315 if (request->flags & NL80211_SCAN_FLAG_FLUSH) {
316 /* flush entries from previous scans */
317 spin_lock_bh(&rdev->bss_lock);
318 __cfg80211_bss_expire(rdev, request->scan_start);
319 spin_unlock_bh(&rdev->bss_lock);
320 request->scan_start = jiffies;
322 nl80211_send_sched_scan_results(rdev, request->dev);
328 void cfg80211_sched_scan_results(struct wiphy *wiphy)
330 trace_cfg80211_sched_scan_results(wiphy);
331 /* ignore if we're not scanning */
333 if (rcu_access_pointer(wiphy_to_rdev(wiphy)->sched_scan_req))
334 queue_work(cfg80211_wq,
335 &wiphy_to_rdev(wiphy)->sched_scan_results_wk);
337 EXPORT_SYMBOL(cfg80211_sched_scan_results);
339 void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy)
341 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
345 trace_cfg80211_sched_scan_stopped(wiphy);
347 __cfg80211_stop_sched_scan(rdev, true);
349 EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl);
351 void cfg80211_sched_scan_stopped(struct wiphy *wiphy)
354 cfg80211_sched_scan_stopped_rtnl(wiphy);
357 EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
359 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
360 bool driver_initiated)
362 struct cfg80211_sched_scan_request *sched_scan_req;
363 struct net_device *dev;
367 if (!rdev->sched_scan_req)
370 sched_scan_req = rtnl_dereference(rdev->sched_scan_req);
371 dev = sched_scan_req->dev;
373 if (!driver_initiated) {
374 int err = rdev_sched_scan_stop(rdev, dev);
379 nl80211_send_sched_scan(rdev, dev, NL80211_CMD_SCHED_SCAN_STOPPED);
381 RCU_INIT_POINTER(rdev->sched_scan_req, NULL);
382 kfree_rcu(sched_scan_req, rcu_head);
387 void cfg80211_bss_age(struct cfg80211_registered_device *rdev,
388 unsigned long age_secs)
390 struct cfg80211_internal_bss *bss;
391 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
393 spin_lock_bh(&rdev->bss_lock);
394 list_for_each_entry(bss, &rdev->bss_list, list)
395 bss->ts -= age_jiffies;
396 spin_unlock_bh(&rdev->bss_lock);
399 void cfg80211_bss_expire(struct cfg80211_registered_device *rdev)
401 __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
404 const u8 *cfg80211_find_ie(u8 eid, const u8 *ies, int len)
406 while (len > 2 && ies[0] != eid) {
412 if (len < 2 + ies[1])
416 EXPORT_SYMBOL(cfg80211_find_ie);
418 const u8 *cfg80211_find_vendor_ie(unsigned int oui, u8 oui_type,
419 const u8 *ies, int len)
421 struct ieee80211_vendor_ie *ie;
422 const u8 *pos = ies, *end = ies + len;
426 pos = cfg80211_find_ie(WLAN_EID_VENDOR_SPECIFIC, pos,
431 ie = (struct ieee80211_vendor_ie *)pos;
433 /* make sure we can access ie->len */
434 BUILD_BUG_ON(offsetof(struct ieee80211_vendor_ie, len) != 1);
436 if (ie->len < sizeof(*ie))
439 ie_oui = ie->oui[0] << 16 | ie->oui[1] << 8 | ie->oui[2];
440 if (ie_oui == oui && ie->oui_type == oui_type)
447 EXPORT_SYMBOL(cfg80211_find_vendor_ie);
449 static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
450 const u8 *ssid, size_t ssid_len)
452 const struct cfg80211_bss_ies *ies;
455 if (bssid && !ether_addr_equal(a->bssid, bssid))
461 ies = rcu_access_pointer(a->ies);
464 ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
467 if (ssidie[1] != ssid_len)
469 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
473 * enum bss_compare_mode - BSS compare mode
474 * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
475 * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
476 * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
478 enum bss_compare_mode {
484 static int cmp_bss(struct cfg80211_bss *a,
485 struct cfg80211_bss *b,
486 enum bss_compare_mode mode)
488 const struct cfg80211_bss_ies *a_ies, *b_ies;
489 const u8 *ie1 = NULL;
490 const u8 *ie2 = NULL;
493 if (a->channel != b->channel)
494 return b->channel->center_freq - a->channel->center_freq;
496 a_ies = rcu_access_pointer(a->ies);
499 b_ies = rcu_access_pointer(b->ies);
503 if (WLAN_CAPABILITY_IS_STA_BSS(a->capability))
504 ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID,
505 a_ies->data, a_ies->len);
506 if (WLAN_CAPABILITY_IS_STA_BSS(b->capability))
507 ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID,
508 b_ies->data, b_ies->len);
512 if (ie1[1] == ie2[1])
513 mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]);
515 mesh_id_cmp = ie2[1] - ie1[1];
517 ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
518 a_ies->data, a_ies->len);
519 ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
520 b_ies->data, b_ies->len);
524 if (ie1[1] != ie2[1])
525 return ie2[1] - ie1[1];
526 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
530 r = memcmp(a->bssid, b->bssid, sizeof(a->bssid));
534 ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
535 ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
541 * Note that with "hide_ssid", the function returns a match if
542 * the already-present BSS ("b") is a hidden SSID beacon for
546 /* sort missing IE before (left of) present IE */
553 case BSS_CMP_HIDE_ZLEN:
555 * In ZLEN mode we assume the BSS entry we're
556 * looking for has a zero-length SSID. So if
557 * the one we're looking at right now has that,
558 * return 0. Otherwise, return the difference
559 * in length, but since we're looking for the
560 * 0-length it's really equivalent to returning
561 * the length of the one we're looking at.
563 * No content comparison is needed as we assume
564 * the content length is zero.
567 case BSS_CMP_REGULAR:
569 /* sort by length first, then by contents */
570 if (ie1[1] != ie2[1])
571 return ie2[1] - ie1[1];
572 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
573 case BSS_CMP_HIDE_NUL:
574 if (ie1[1] != ie2[1])
575 return ie2[1] - ie1[1];
576 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */
577 for (i = 0; i < ie2[1]; i++)
584 static bool cfg80211_bss_type_match(u16 capability,
585 enum ieee80211_band band,
586 enum ieee80211_bss_type bss_type)
591 if (bss_type == IEEE80211_BSS_TYPE_ANY)
594 if (band == IEEE80211_BAND_60GHZ) {
595 mask = WLAN_CAPABILITY_DMG_TYPE_MASK;
597 case IEEE80211_BSS_TYPE_ESS:
598 val = WLAN_CAPABILITY_DMG_TYPE_AP;
600 case IEEE80211_BSS_TYPE_PBSS:
601 val = WLAN_CAPABILITY_DMG_TYPE_PBSS;
603 case IEEE80211_BSS_TYPE_IBSS:
604 val = WLAN_CAPABILITY_DMG_TYPE_IBSS;
610 mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS;
612 case IEEE80211_BSS_TYPE_ESS:
613 val = WLAN_CAPABILITY_ESS;
615 case IEEE80211_BSS_TYPE_IBSS:
616 val = WLAN_CAPABILITY_IBSS;
618 case IEEE80211_BSS_TYPE_MBSS:
626 ret = ((capability & mask) == val);
630 /* Returned bss is reference counted and must be cleaned up appropriately. */
631 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
632 struct ieee80211_channel *channel,
634 const u8 *ssid, size_t ssid_len,
635 enum ieee80211_bss_type bss_type,
636 enum ieee80211_privacy privacy)
638 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
639 struct cfg80211_internal_bss *bss, *res = NULL;
640 unsigned long now = jiffies;
643 trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type,
646 spin_lock_bh(&rdev->bss_lock);
648 list_for_each_entry(bss, &rdev->bss_list, list) {
649 if (!cfg80211_bss_type_match(bss->pub.capability,
650 bss->pub.channel->band, bss_type))
653 bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY);
654 if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) ||
655 (privacy == IEEE80211_PRIVACY_OFF && bss_privacy))
657 if (channel && bss->pub.channel != channel)
659 if (!is_valid_ether_addr(bss->pub.bssid))
661 /* Don't get expired BSS structs */
662 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
663 !atomic_read(&bss->hold))
665 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
667 bss_ref_get(rdev, res);
672 spin_unlock_bh(&rdev->bss_lock);
675 trace_cfg80211_return_bss(&res->pub);
678 EXPORT_SYMBOL(cfg80211_get_bss);
680 static void rb_insert_bss(struct cfg80211_registered_device *rdev,
681 struct cfg80211_internal_bss *bss)
683 struct rb_node **p = &rdev->bss_tree.rb_node;
684 struct rb_node *parent = NULL;
685 struct cfg80211_internal_bss *tbss;
690 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
692 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR);
695 /* will sort of leak this BSS */
705 rb_link_node(&bss->rbn, parent, p);
706 rb_insert_color(&bss->rbn, &rdev->bss_tree);
709 static struct cfg80211_internal_bss *
710 rb_find_bss(struct cfg80211_registered_device *rdev,
711 struct cfg80211_internal_bss *res,
712 enum bss_compare_mode mode)
714 struct rb_node *n = rdev->bss_tree.rb_node;
715 struct cfg80211_internal_bss *bss;
719 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
720 r = cmp_bss(&res->pub, &bss->pub, mode);
733 static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev,
734 struct cfg80211_internal_bss *new)
736 const struct cfg80211_bss_ies *ies;
737 struct cfg80211_internal_bss *bss;
743 ies = rcu_access_pointer(new->pub.beacon_ies);
747 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
754 for (i = 0; i < ssidlen; i++)
758 /* not a hidden SSID */
762 /* This is the bad part ... */
764 list_for_each_entry(bss, &rdev->bss_list, list) {
766 * we're iterating all the entries anyway, so take the
767 * opportunity to validate the list length accounting
771 if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid))
773 if (bss->pub.channel != new->pub.channel)
775 if (bss->pub.scan_width != new->pub.scan_width)
777 if (rcu_access_pointer(bss->pub.beacon_ies))
779 ies = rcu_access_pointer(bss->pub.ies);
782 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
785 if (ssidlen && ie[1] != ssidlen)
787 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss))
789 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list)))
790 list_del(&bss->hidden_list);
792 list_add(&bss->hidden_list, &new->hidden_list);
793 bss->pub.hidden_beacon_bss = &new->pub;
794 new->refcount += bss->refcount;
795 rcu_assign_pointer(bss->pub.beacon_ies,
796 new->pub.beacon_ies);
799 WARN_ONCE(n_entries != rdev->bss_entries,
800 "rdev bss entries[%d]/list[len:%d] corruption\n",
801 rdev->bss_entries, n_entries);
806 /* Returned bss is reference counted and must be cleaned up appropriately. */
807 static struct cfg80211_internal_bss *
808 cfg80211_bss_update(struct cfg80211_registered_device *rdev,
809 struct cfg80211_internal_bss *tmp,
812 struct cfg80211_internal_bss *found = NULL;
814 if (WARN_ON(!tmp->pub.channel))
819 spin_lock_bh(&rdev->bss_lock);
821 if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
822 spin_unlock_bh(&rdev->bss_lock);
826 found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR);
830 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
831 const struct cfg80211_bss_ies *old;
833 old = rcu_access_pointer(found->pub.proberesp_ies);
835 rcu_assign_pointer(found->pub.proberesp_ies,
836 tmp->pub.proberesp_ies);
837 /* Override possible earlier Beacon frame IEs */
838 rcu_assign_pointer(found->pub.ies,
839 tmp->pub.proberesp_ies);
841 kfree_rcu((struct cfg80211_bss_ies *)old,
843 } else if (rcu_access_pointer(tmp->pub.beacon_ies)) {
844 const struct cfg80211_bss_ies *old;
845 struct cfg80211_internal_bss *bss;
847 if (found->pub.hidden_beacon_bss &&
848 !list_empty(&found->hidden_list)) {
849 const struct cfg80211_bss_ies *f;
852 * The found BSS struct is one of the probe
853 * response members of a group, but we're
854 * receiving a beacon (beacon_ies in the tmp
855 * bss is used). This can only mean that the
856 * AP changed its beacon from not having an
857 * SSID to showing it, which is confusing so
858 * drop this information.
861 f = rcu_access_pointer(tmp->pub.beacon_ies);
862 kfree_rcu((struct cfg80211_bss_ies *)f,
867 old = rcu_access_pointer(found->pub.beacon_ies);
869 rcu_assign_pointer(found->pub.beacon_ies,
870 tmp->pub.beacon_ies);
872 /* Override IEs if they were from a beacon before */
873 if (old == rcu_access_pointer(found->pub.ies))
874 rcu_assign_pointer(found->pub.ies,
875 tmp->pub.beacon_ies);
877 /* Assign beacon IEs to all sub entries */
878 list_for_each_entry(bss, &found->hidden_list,
880 const struct cfg80211_bss_ies *ies;
882 ies = rcu_access_pointer(bss->pub.beacon_ies);
885 rcu_assign_pointer(bss->pub.beacon_ies,
886 tmp->pub.beacon_ies);
890 kfree_rcu((struct cfg80211_bss_ies *)old,
894 found->pub.beacon_interval = tmp->pub.beacon_interval;
896 * don't update the signal if beacon was heard on
900 found->pub.signal = tmp->pub.signal;
901 found->pub.capability = tmp->pub.capability;
903 found->ts_boottime = tmp->ts_boottime;
905 struct cfg80211_internal_bss *new;
906 struct cfg80211_internal_bss *hidden;
907 struct cfg80211_bss_ies *ies;
910 * create a copy -- the "res" variable that is passed in
911 * is allocated on the stack since it's not needed in the
912 * more common case of an update
914 new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size,
917 ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
919 kfree_rcu(ies, rcu_head);
920 ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
922 kfree_rcu(ies, rcu_head);
925 memcpy(new, tmp, sizeof(*new));
927 INIT_LIST_HEAD(&new->hidden_list);
929 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
930 hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
932 hidden = rb_find_bss(rdev, tmp,
935 new->pub.hidden_beacon_bss = &hidden->pub;
936 list_add(&new->hidden_list,
937 &hidden->hidden_list);
939 rcu_assign_pointer(new->pub.beacon_ies,
940 hidden->pub.beacon_ies);
944 * Ok so we found a beacon, and don't have an entry. If
945 * it's a beacon with hidden SSID, we might be in for an
946 * expensive search for any probe responses that should
947 * be grouped with this beacon for updates ...
949 if (!cfg80211_combine_bsses(rdev, new)) {
955 if (rdev->bss_entries >= bss_entries_limit &&
956 !cfg80211_bss_expire_oldest(rdev)) {
961 list_add_tail(&new->list, &rdev->bss_list);
963 rb_insert_bss(rdev, new);
967 rdev->bss_generation++;
968 bss_ref_get(rdev, found);
969 spin_unlock_bh(&rdev->bss_lock);
973 spin_unlock_bh(&rdev->bss_lock);
977 static struct ieee80211_channel *
978 cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
979 struct ieee80211_channel *channel)
983 int channel_number = -1;
985 tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen);
986 if (tmp && tmp[1] == 1) {
987 channel_number = tmp[2];
989 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen);
990 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) {
991 struct ieee80211_ht_operation *htop = (void *)(tmp + 2);
993 channel_number = htop->primary_chan;
997 if (channel_number < 0)
1000 freq = ieee80211_channel_to_frequency(channel_number, channel->band);
1001 channel = ieee80211_get_channel(wiphy, freq);
1004 if (channel->flags & IEEE80211_CHAN_DISABLED)
1009 /* Returned bss is reference counted and must be cleaned up appropriately. */
1010 struct cfg80211_bss *
1011 cfg80211_inform_bss_data(struct wiphy *wiphy,
1012 struct cfg80211_inform_bss *data,
1013 enum cfg80211_bss_frame_type ftype,
1014 const u8 *bssid, u64 tsf, u16 capability,
1015 u16 beacon_interval, const u8 *ie, size_t ielen,
1018 struct cfg80211_bss_ies *ies;
1019 struct ieee80211_channel *channel;
1020 struct cfg80211_internal_bss tmp = {}, *res;
1024 if (WARN_ON(!wiphy))
1027 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
1028 (data->signal < 0 || data->signal > 100)))
1031 channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan);
1035 memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
1036 tmp.pub.channel = channel;
1037 tmp.pub.scan_width = data->scan_width;
1038 tmp.pub.signal = data->signal;
1039 tmp.pub.beacon_interval = beacon_interval;
1040 tmp.pub.capability = capability;
1041 tmp.ts_boottime = data->boottime_ns;
1044 * If we do not know here whether the IEs are from a Beacon or Probe
1045 * Response frame, we need to pick one of the options and only use it
1046 * with the driver that does not provide the full Beacon/Probe Response
1047 * frame. Use Beacon frame pointer to avoid indicating that this should
1048 * override the IEs pointer should we have received an earlier
1049 * indication of Probe Response data.
1051 ies = kzalloc(sizeof(*ies) + ielen, gfp);
1056 ies->from_beacon = false;
1057 memcpy(ies->data, ie, ielen);
1060 case CFG80211_BSS_FTYPE_BEACON:
1061 ies->from_beacon = true;
1062 /* fall through to assign */
1063 case CFG80211_BSS_FTYPE_UNKNOWN:
1064 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1066 case CFG80211_BSS_FTYPE_PRESP:
1067 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1070 rcu_assign_pointer(tmp.pub.ies, ies);
1072 signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
1073 wiphy->max_adj_channel_rssi_comp;
1074 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
1078 if (channel->band == IEEE80211_BAND_60GHZ) {
1079 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1080 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1081 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1082 regulatory_hint_found_beacon(wiphy, channel, gfp);
1084 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1085 regulatory_hint_found_beacon(wiphy, channel, gfp);
1088 trace_cfg80211_return_bss(&res->pub);
1089 /* cfg80211_bss_update gives us a referenced result */
1092 EXPORT_SYMBOL(cfg80211_inform_bss_data);
1094 /* cfg80211_inform_bss_width_frame helper */
1095 struct cfg80211_bss *
1096 cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
1097 struct cfg80211_inform_bss *data,
1098 struct ieee80211_mgmt *mgmt, size_t len,
1102 struct cfg80211_internal_bss tmp = {}, *res;
1103 struct cfg80211_bss_ies *ies;
1104 struct ieee80211_channel *channel;
1106 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1107 u.probe_resp.variable);
1110 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
1111 offsetof(struct ieee80211_mgmt, u.beacon.variable));
1113 trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len);
1118 if (WARN_ON(!wiphy))
1121 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
1122 (data->signal < 0 || data->signal > 100)))
1125 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
1128 channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable,
1133 ies = kzalloc(sizeof(*ies) + ielen, gfp);
1137 ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
1138 ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
1139 memcpy(ies->data, mgmt->u.probe_resp.variable, ielen);
1141 if (ieee80211_is_probe_resp(mgmt->frame_control))
1142 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1144 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1145 rcu_assign_pointer(tmp.pub.ies, ies);
1147 memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN);
1148 tmp.pub.channel = channel;
1149 tmp.pub.scan_width = data->scan_width;
1150 tmp.pub.signal = data->signal;
1151 tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
1152 tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
1153 tmp.ts_boottime = data->boottime_ns;
1155 signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
1156 wiphy->max_adj_channel_rssi_comp;
1157 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
1161 if (channel->band == IEEE80211_BAND_60GHZ) {
1162 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1163 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1164 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1165 regulatory_hint_found_beacon(wiphy, channel, gfp);
1167 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1168 regulatory_hint_found_beacon(wiphy, channel, gfp);
1171 trace_cfg80211_return_bss(&res->pub);
1172 /* cfg80211_bss_update gives us a referenced result */
1175 EXPORT_SYMBOL(cfg80211_inform_bss_frame_data);
1177 void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1179 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1180 struct cfg80211_internal_bss *bss;
1185 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1187 spin_lock_bh(&rdev->bss_lock);
1188 bss_ref_get(rdev, bss);
1189 spin_unlock_bh(&rdev->bss_lock);
1191 EXPORT_SYMBOL(cfg80211_ref_bss);
1193 void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1195 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1196 struct cfg80211_internal_bss *bss;
1201 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1203 spin_lock_bh(&rdev->bss_lock);
1204 bss_ref_put(rdev, bss);
1205 spin_unlock_bh(&rdev->bss_lock);
1207 EXPORT_SYMBOL(cfg80211_put_bss);
1209 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1211 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1212 struct cfg80211_internal_bss *bss;
1217 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1219 spin_lock_bh(&rdev->bss_lock);
1220 if (!list_empty(&bss->list)) {
1221 if (__cfg80211_unlink_bss(rdev, bss))
1222 rdev->bss_generation++;
1224 spin_unlock_bh(&rdev->bss_lock);
1226 EXPORT_SYMBOL(cfg80211_unlink_bss);
1228 #ifdef CONFIG_CFG80211_WEXT
1229 static struct cfg80211_registered_device *
1230 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
1232 struct cfg80211_registered_device *rdev;
1233 struct net_device *dev;
1237 dev = dev_get_by_index(net, ifindex);
1239 return ERR_PTR(-ENODEV);
1240 if (dev->ieee80211_ptr)
1241 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
1243 rdev = ERR_PTR(-ENODEV);
1248 int cfg80211_wext_siwscan(struct net_device *dev,
1249 struct iw_request_info *info,
1250 union iwreq_data *wrqu, char *extra)
1252 struct cfg80211_registered_device *rdev;
1253 struct wiphy *wiphy;
1254 struct iw_scan_req *wreq = NULL;
1255 struct cfg80211_scan_request *creq = NULL;
1256 int i, err, n_channels = 0;
1257 enum ieee80211_band band;
1259 if (!netif_running(dev))
1262 if (wrqu->data.length == sizeof(struct iw_scan_req))
1263 wreq = (struct iw_scan_req *)extra;
1265 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1268 return PTR_ERR(rdev);
1270 if (rdev->scan_req || rdev->scan_msg) {
1275 wiphy = &rdev->wiphy;
1277 /* Determine number of channels, needed to allocate creq */
1278 if (wreq && wreq->num_channels)
1279 n_channels = wreq->num_channels;
1281 n_channels = ieee80211_get_num_supported_channels(wiphy);
1283 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
1284 n_channels * sizeof(void *),
1291 creq->wiphy = wiphy;
1292 creq->wdev = dev->ieee80211_ptr;
1293 /* SSIDs come after channels */
1294 creq->ssids = (void *)&creq->channels[n_channels];
1295 creq->n_channels = n_channels;
1297 creq->scan_start = jiffies;
1299 /* translate "Scan on frequencies" request */
1301 for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1304 if (!wiphy->bands[band])
1307 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
1308 /* ignore disabled channels */
1309 if (wiphy->bands[band]->channels[j].flags &
1310 IEEE80211_CHAN_DISABLED)
1313 /* If we have a wireless request structure and the
1314 * wireless request specifies frequencies, then search
1315 * for the matching hardware channel.
1317 if (wreq && wreq->num_channels) {
1319 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
1320 for (k = 0; k < wreq->num_channels; k++) {
1321 struct iw_freq *freq =
1322 &wreq->channel_list[k];
1324 cfg80211_wext_freq(freq);
1326 if (wext_freq == wiphy_freq)
1327 goto wext_freq_found;
1329 goto wext_freq_not_found;
1333 creq->channels[i] = &wiphy->bands[band]->channels[j];
1335 wext_freq_not_found: ;
1338 /* No channels found? */
1344 /* Set real number of channels specified in creq->channels[] */
1345 creq->n_channels = i;
1347 /* translate "Scan for SSID" request */
1349 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
1350 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
1354 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
1355 creq->ssids[0].ssid_len = wreq->essid_len;
1357 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
1361 for (i = 0; i < IEEE80211_NUM_BANDS; i++)
1362 if (wiphy->bands[i])
1363 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
1365 rdev->scan_req = creq;
1366 err = rdev_scan(rdev, creq);
1368 rdev->scan_req = NULL;
1369 /* creq will be freed below */
1371 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
1372 /* creq now owned by driver */
1380 EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
1382 static char *ieee80211_scan_add_ies(struct iw_request_info *info,
1383 const struct cfg80211_bss_ies *ies,
1384 char *current_ev, char *end_buf)
1386 const u8 *pos, *end, *next;
1387 struct iw_event iwe;
1393 * If needed, fragment the IEs buffer (at IE boundaries) into short
1394 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
1397 end = pos + ies->len;
1399 while (end - pos > IW_GENERIC_IE_MAX) {
1400 next = pos + 2 + pos[1];
1401 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
1402 next = next + 2 + next[1];
1404 memset(&iwe, 0, sizeof(iwe));
1405 iwe.cmd = IWEVGENIE;
1406 iwe.u.data.length = next - pos;
1407 current_ev = iwe_stream_add_point_check(info, current_ev,
1410 if (IS_ERR(current_ev))
1416 memset(&iwe, 0, sizeof(iwe));
1417 iwe.cmd = IWEVGENIE;
1418 iwe.u.data.length = end - pos;
1419 current_ev = iwe_stream_add_point_check(info, current_ev,
1422 if (IS_ERR(current_ev))
1430 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
1431 struct cfg80211_internal_bss *bss, char *current_ev,
1434 const struct cfg80211_bss_ies *ies;
1435 struct iw_event iwe;
1440 bool ismesh = false;
1442 memset(&iwe, 0, sizeof(iwe));
1443 iwe.cmd = SIOCGIWAP;
1444 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1445 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
1446 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
1448 if (IS_ERR(current_ev))
1451 memset(&iwe, 0, sizeof(iwe));
1452 iwe.cmd = SIOCGIWFREQ;
1453 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
1455 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
1457 if (IS_ERR(current_ev))
1460 memset(&iwe, 0, sizeof(iwe));
1461 iwe.cmd = SIOCGIWFREQ;
1462 iwe.u.freq.m = bss->pub.channel->center_freq;
1464 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
1466 if (IS_ERR(current_ev))
1469 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
1470 memset(&iwe, 0, sizeof(iwe));
1472 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
1473 IW_QUAL_NOISE_INVALID |
1474 IW_QUAL_QUAL_UPDATED;
1475 switch (wiphy->signal_type) {
1476 case CFG80211_SIGNAL_TYPE_MBM:
1477 sig = bss->pub.signal / 100;
1478 iwe.u.qual.level = sig;
1479 iwe.u.qual.updated |= IW_QUAL_DBM;
1480 if (sig < -110) /* rather bad */
1482 else if (sig > -40) /* perfect */
1484 /* will give a range of 0 .. 70 */
1485 iwe.u.qual.qual = sig + 110;
1487 case CFG80211_SIGNAL_TYPE_UNSPEC:
1488 iwe.u.qual.level = bss->pub.signal;
1489 /* will give range 0 .. 100 */
1490 iwe.u.qual.qual = bss->pub.signal;
1496 current_ev = iwe_stream_add_event_check(info, current_ev,
1499 if (IS_ERR(current_ev))
1503 memset(&iwe, 0, sizeof(iwe));
1504 iwe.cmd = SIOCGIWENCODE;
1505 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
1506 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1508 iwe.u.data.flags = IW_ENCODE_DISABLED;
1509 iwe.u.data.length = 0;
1510 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
1512 if (IS_ERR(current_ev))
1516 ies = rcu_dereference(bss->pub.ies);
1522 if (ie[1] > rem - 2)
1527 memset(&iwe, 0, sizeof(iwe));
1528 iwe.cmd = SIOCGIWESSID;
1529 iwe.u.data.length = ie[1];
1530 iwe.u.data.flags = 1;
1531 current_ev = iwe_stream_add_point_check(info,
1535 if (IS_ERR(current_ev))
1538 case WLAN_EID_MESH_ID:
1539 memset(&iwe, 0, sizeof(iwe));
1540 iwe.cmd = SIOCGIWESSID;
1541 iwe.u.data.length = ie[1];
1542 iwe.u.data.flags = 1;
1543 current_ev = iwe_stream_add_point_check(info,
1547 if (IS_ERR(current_ev))
1550 case WLAN_EID_MESH_CONFIG:
1552 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
1555 memset(&iwe, 0, sizeof(iwe));
1556 iwe.cmd = IWEVCUSTOM;
1557 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
1559 iwe.u.data.length = strlen(buf);
1560 current_ev = iwe_stream_add_point_check(info,
1564 if (IS_ERR(current_ev))
1566 sprintf(buf, "Path Selection Metric ID: 0x%02X",
1568 iwe.u.data.length = strlen(buf);
1569 current_ev = iwe_stream_add_point_check(info,
1573 if (IS_ERR(current_ev))
1575 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
1577 iwe.u.data.length = strlen(buf);
1578 current_ev = iwe_stream_add_point_check(info,
1582 if (IS_ERR(current_ev))
1584 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
1585 iwe.u.data.length = strlen(buf);
1586 current_ev = iwe_stream_add_point_check(info,
1590 if (IS_ERR(current_ev))
1592 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
1593 iwe.u.data.length = strlen(buf);
1594 current_ev = iwe_stream_add_point_check(info,
1598 if (IS_ERR(current_ev))
1600 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
1601 iwe.u.data.length = strlen(buf);
1602 current_ev = iwe_stream_add_point_check(info,
1606 if (IS_ERR(current_ev))
1608 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
1609 iwe.u.data.length = strlen(buf);
1610 current_ev = iwe_stream_add_point_check(info,
1614 if (IS_ERR(current_ev))
1617 case WLAN_EID_SUPP_RATES:
1618 case WLAN_EID_EXT_SUPP_RATES:
1619 /* display all supported rates in readable format */
1620 p = current_ev + iwe_stream_lcp_len(info);
1622 memset(&iwe, 0, sizeof(iwe));
1623 iwe.cmd = SIOCGIWRATE;
1624 /* Those two flags are ignored... */
1625 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
1627 for (i = 0; i < ie[1]; i++) {
1628 iwe.u.bitrate.value =
1629 ((ie[i + 2] & 0x7f) * 500000);
1631 p = iwe_stream_add_value(info, current_ev, p,
1635 current_ev = ERR_PTR(-E2BIG);
1646 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
1648 memset(&iwe, 0, sizeof(iwe));
1649 iwe.cmd = SIOCGIWMODE;
1651 iwe.u.mode = IW_MODE_MESH;
1652 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
1653 iwe.u.mode = IW_MODE_MASTER;
1655 iwe.u.mode = IW_MODE_ADHOC;
1656 current_ev = iwe_stream_add_event_check(info, current_ev,
1659 if (IS_ERR(current_ev))
1663 memset(&iwe, 0, sizeof(iwe));
1664 iwe.cmd = IWEVCUSTOM;
1665 sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
1666 iwe.u.data.length = strlen(buf);
1667 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
1669 if (IS_ERR(current_ev))
1671 memset(&iwe, 0, sizeof(iwe));
1672 iwe.cmd = IWEVCUSTOM;
1673 sprintf(buf, " Last beacon: %ums ago",
1674 elapsed_jiffies_msecs(bss->ts));
1675 iwe.u.data.length = strlen(buf);
1676 current_ev = iwe_stream_add_point_check(info, current_ev,
1677 end_buf, &iwe, buf);
1678 if (IS_ERR(current_ev))
1681 current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
1689 static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
1690 struct iw_request_info *info,
1691 char *buf, size_t len)
1693 char *current_ev = buf;
1694 char *end_buf = buf + len;
1695 struct cfg80211_internal_bss *bss;
1698 spin_lock_bh(&rdev->bss_lock);
1699 cfg80211_bss_expire(rdev);
1701 list_for_each_entry(bss, &rdev->bss_list, list) {
1702 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
1706 current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
1707 current_ev, end_buf);
1708 if (IS_ERR(current_ev)) {
1709 err = PTR_ERR(current_ev);
1713 spin_unlock_bh(&rdev->bss_lock);
1717 return current_ev - buf;
1721 int cfg80211_wext_giwscan(struct net_device *dev,
1722 struct iw_request_info *info,
1723 struct iw_point *data, char *extra)
1725 struct cfg80211_registered_device *rdev;
1728 if (!netif_running(dev))
1731 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1734 return PTR_ERR(rdev);
1736 if (rdev->scan_req || rdev->scan_msg)
1739 res = ieee80211_scan_results(rdev, info, extra, data->length);
1748 EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan);