2 * cfg80211 scan result handling
4 * Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
5 * Copyright 2013-2014 Intel Mobile Communications GmbH
6 * Copyright 2016 Intel Deutschland GmbH
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>
16 #include <net/cfg80211.h>
17 #include <net/cfg80211-wext.h>
18 #include <net/iw_handler.h>
21 #include "wext-compat.h"
25 * DOC: BSS tree/list structure
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
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.
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.
50 * Note that the hidden_beacon_bss pointer never changes, due to
51 * the reference counting. Therefore, no locking is needed for
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.
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.)
68 static int bss_entries_limit = 1000;
69 module_param(bss_entries_limit, int, 0644);
70 MODULE_PARM_DESC(bss_entries_limit,
71 "limit to number of scan BSS entries (per wiphy, default 1000)");
73 #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ)
75 static void bss_free(struct cfg80211_internal_bss *bss)
77 struct cfg80211_bss_ies *ies;
79 if (WARN_ON(atomic_read(&bss->hold)))
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);
87 kfree_rcu(ies, rcu_head);
90 * This happens when the module is removed, it doesn't
91 * really matter any more save for completeness
93 if (!list_empty(&bss->hidden_list))
94 list_del(&bss->hidden_list);
99 static inline void bss_ref_get(struct cfg80211_registered_device *rdev,
100 struct cfg80211_internal_bss *bss)
102 lockdep_assert_held(&rdev->bss_lock);
105 if (bss->pub.hidden_beacon_bss) {
106 bss = container_of(bss->pub.hidden_beacon_bss,
107 struct cfg80211_internal_bss,
113 static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
114 struct cfg80211_internal_bss *bss)
116 lockdep_assert_held(&rdev->bss_lock);
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,
124 if (hbss->refcount == 0)
128 if (bss->refcount == 0)
132 static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev,
133 struct cfg80211_internal_bss *bss)
135 lockdep_assert_held(&rdev->bss_lock);
137 if (!list_empty(&bss->hidden_list)) {
139 * don't remove the beacon entry if it has
140 * probe responses associated with it
142 if (!bss->pub.hidden_beacon_bss)
145 * if it's a probe response entry break its
146 * link to the other entries in the group
148 list_del_init(&bss->hidden_list);
151 list_del_init(&bss->list);
152 rb_erase(&bss->rbn, &rdev->bss_tree);
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);
161 static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev,
162 unsigned long expire_time)
164 struct cfg80211_internal_bss *bss, *tmp;
165 bool expired = false;
167 lockdep_assert_held(&rdev->bss_lock);
169 list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) {
170 if (atomic_read(&bss->hold))
172 if (!time_after(expire_time, bss->ts))
175 if (__cfg80211_unlink_bss(rdev, bss))
180 rdev->bss_generation++;
183 static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev)
185 struct cfg80211_internal_bss *bss, *oldest = NULL;
188 lockdep_assert_held(&rdev->bss_lock);
190 list_for_each_entry(bss, &rdev->bss_list, list) {
191 if (atomic_read(&bss->hold))
194 if (!list_empty(&bss->hidden_list) &&
195 !bss->pub.hidden_beacon_bss)
198 if (oldest && time_before(oldest->ts, bss->ts))
203 if (WARN_ON(!oldest))
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
212 ret = __cfg80211_unlink_bss(rdev, oldest);
217 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
220 struct cfg80211_scan_request *request;
221 struct wireless_dev *wdev;
223 #ifdef CONFIG_CFG80211_WEXT
224 union iwreq_data wrqu;
229 if (rdev->scan_msg) {
230 nl80211_send_scan_msg(rdev, rdev->scan_msg);
231 rdev->scan_msg = NULL;
235 request = rdev->scan_req;
239 wdev = request->wdev;
242 * This must be before sending the other events!
243 * Otherwise, wpa_supplicant gets completely confused with
247 cfg80211_sme_scan_done(wdev->netdev);
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);
257 msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted);
259 #ifdef CONFIG_CFG80211_WEXT
260 if (wdev->netdev && !request->info.aborted) {
261 memset(&wrqu, 0, sizeof(wrqu));
263 wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
268 dev_put(wdev->netdev);
270 rdev->scan_req = NULL;
274 rdev->scan_msg = msg;
276 nl80211_send_scan_msg(rdev, msg);
279 void __cfg80211_scan_done(struct work_struct *wk)
281 struct cfg80211_registered_device *rdev;
283 rdev = container_of(wk, struct cfg80211_registered_device,
287 ___cfg80211_scan_done(rdev, true);
291 void cfg80211_scan_done(struct cfg80211_scan_request *request,
292 struct cfg80211_scan_info *info)
294 trace_cfg80211_scan_done(request, info);
295 WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req);
297 request->info = *info;
298 request->notified = true;
299 queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk);
301 EXPORT_SYMBOL(cfg80211_scan_done);
303 void cfg80211_add_sched_scan_req(struct cfg80211_registered_device *rdev,
304 struct cfg80211_sched_scan_request *req)
308 list_add_rcu(&req->list, &rdev->sched_scan_req_list);
311 static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device *rdev,
312 struct cfg80211_sched_scan_request *req)
316 list_del_rcu(&req->list);
317 kfree_rcu(req, rcu_head);
320 static struct cfg80211_sched_scan_request *
321 cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid)
323 struct cfg80211_sched_scan_request *pos;
327 list_for_each_entry(pos, &rdev->sched_scan_req_list, list) {
328 if (pos->reqid == reqid)
331 return ERR_PTR(-ENOENT);
335 * Determines if a scheduled scan request can be handled. When a legacy
336 * scheduled scan is running no other scheduled scan is allowed regardless
337 * whether the request is for legacy or multi-support scan. When a multi-support
338 * scheduled scan is running a request for legacy scan is not allowed. In this
339 * case a request for multi-support scan can be handled if resources are
340 * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached.
342 int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev,
345 struct cfg80211_sched_scan_request *pos;
348 list_for_each_entry(pos, &rdev->sched_scan_req_list, list) {
349 /* request id zero means legacy in progress */
350 if (!i && !pos->reqid)
356 /* no legacy allowed when multi request(s) are active */
360 /* resource limit reached */
361 if (i == rdev->wiphy.max_sched_scan_reqs)
367 void __cfg80211_sched_scan_results(struct work_struct *wk)
369 struct cfg80211_registered_device *rdev;
370 struct cfg80211_sched_scan_request *request;
372 rdev = container_of(wk, struct cfg80211_registered_device,
373 sched_scan_results_wk);
377 request = cfg80211_find_sched_scan_req(rdev, 0);
379 /* we don't have sched_scan_req anymore if the scan is stopping */
380 if (!IS_ERR(request)) {
381 if (request->flags & NL80211_SCAN_FLAG_FLUSH) {
382 /* flush entries from previous scans */
383 spin_lock_bh(&rdev->bss_lock);
384 __cfg80211_bss_expire(rdev, request->scan_start);
385 spin_unlock_bh(&rdev->bss_lock);
386 request->scan_start = jiffies;
388 nl80211_send_sched_scan(request, NL80211_CMD_SCHED_SCAN_RESULTS);
394 void cfg80211_sched_scan_results(struct wiphy *wiphy)
396 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
397 struct cfg80211_sched_scan_request *request;
399 trace_cfg80211_sched_scan_results(wiphy);
400 /* ignore if we're not scanning */
403 request = cfg80211_find_sched_scan_req(rdev, 0);
406 if (!IS_ERR(request))
407 queue_work(cfg80211_wq,
408 &wiphy_to_rdev(wiphy)->sched_scan_results_wk);
410 EXPORT_SYMBOL(cfg80211_sched_scan_results);
412 void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy)
414 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
418 trace_cfg80211_sched_scan_stopped(wiphy);
420 __cfg80211_stop_sched_scan(rdev, 0, true);
422 EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl);
424 void cfg80211_sched_scan_stopped(struct wiphy *wiphy)
427 cfg80211_sched_scan_stopped_rtnl(wiphy);
430 EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
432 int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev,
433 struct cfg80211_sched_scan_request *req,
434 bool driver_initiated)
438 if (!driver_initiated) {
439 int err = rdev_sched_scan_stop(rdev, req->dev);
444 nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED);
446 cfg80211_del_sched_scan_req(rdev, req);
451 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
452 u64 reqid, bool driver_initiated)
454 struct cfg80211_sched_scan_request *sched_scan_req;
458 sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid);
459 if (IS_ERR(sched_scan_req))
460 return PTR_ERR(sched_scan_req);
462 return cfg80211_stop_sched_scan_req(rdev, sched_scan_req,
466 void cfg80211_bss_age(struct cfg80211_registered_device *rdev,
467 unsigned long age_secs)
469 struct cfg80211_internal_bss *bss;
470 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
472 spin_lock_bh(&rdev->bss_lock);
473 list_for_each_entry(bss, &rdev->bss_list, list)
474 bss->ts -= age_jiffies;
475 spin_unlock_bh(&rdev->bss_lock);
478 void cfg80211_bss_expire(struct cfg80211_registered_device *rdev)
480 __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
483 const u8 *cfg80211_find_ie_match(u8 eid, const u8 *ies, int len,
484 const u8 *match, int match_len,
487 /* match_offset can't be smaller than 2, unless match_len is
488 * zero, in which case match_offset must be zero as well.
490 if (WARN_ON((match_len && match_offset < 2) ||
491 (!match_len && match_offset)))
494 while (len >= 2 && len >= ies[1] + 2) {
495 if ((ies[0] == eid) &&
496 (ies[1] + 2 >= match_offset + match_len) &&
497 !memcmp(ies + match_offset, match, match_len))
506 EXPORT_SYMBOL(cfg80211_find_ie_match);
508 const u8 *cfg80211_find_vendor_ie(unsigned int oui, int oui_type,
509 const u8 *ies, int len)
512 u8 match[] = { oui >> 16, oui >> 8, oui, oui_type };
513 int match_len = (oui_type < 0) ? 3 : sizeof(match);
515 if (WARN_ON(oui_type > 0xff))
518 ie = cfg80211_find_ie_match(WLAN_EID_VENDOR_SPECIFIC, ies, len,
519 match, match_len, 2);
521 if (ie && (ie[1] < 4))
526 EXPORT_SYMBOL(cfg80211_find_vendor_ie);
528 static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
529 const u8 *ssid, size_t ssid_len)
531 const struct cfg80211_bss_ies *ies;
534 if (bssid && !ether_addr_equal(a->bssid, bssid))
540 ies = rcu_access_pointer(a->ies);
543 ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
546 if (ssidie[1] != ssid_len)
548 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
552 * enum bss_compare_mode - BSS compare mode
553 * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
554 * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
555 * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
557 enum bss_compare_mode {
563 static int cmp_bss(struct cfg80211_bss *a,
564 struct cfg80211_bss *b,
565 enum bss_compare_mode mode)
567 const struct cfg80211_bss_ies *a_ies, *b_ies;
568 const u8 *ie1 = NULL;
569 const u8 *ie2 = NULL;
572 if (a->channel != b->channel)
573 return b->channel->center_freq - a->channel->center_freq;
575 a_ies = rcu_access_pointer(a->ies);
578 b_ies = rcu_access_pointer(b->ies);
582 if (WLAN_CAPABILITY_IS_STA_BSS(a->capability))
583 ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID,
584 a_ies->data, a_ies->len);
585 if (WLAN_CAPABILITY_IS_STA_BSS(b->capability))
586 ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID,
587 b_ies->data, b_ies->len);
591 if (ie1[1] == ie2[1])
592 mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]);
594 mesh_id_cmp = ie2[1] - ie1[1];
596 ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
597 a_ies->data, a_ies->len);
598 ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
599 b_ies->data, b_ies->len);
603 if (ie1[1] != ie2[1])
604 return ie2[1] - ie1[1];
605 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
609 r = memcmp(a->bssid, b->bssid, sizeof(a->bssid));
613 ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
614 ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
620 * Note that with "hide_ssid", the function returns a match if
621 * the already-present BSS ("b") is a hidden SSID beacon for
625 /* sort missing IE before (left of) present IE */
632 case BSS_CMP_HIDE_ZLEN:
634 * In ZLEN mode we assume the BSS entry we're
635 * looking for has a zero-length SSID. So if
636 * the one we're looking at right now has that,
637 * return 0. Otherwise, return the difference
638 * in length, but since we're looking for the
639 * 0-length it's really equivalent to returning
640 * the length of the one we're looking at.
642 * No content comparison is needed as we assume
643 * the content length is zero.
646 case BSS_CMP_REGULAR:
648 /* sort by length first, then by contents */
649 if (ie1[1] != ie2[1])
650 return ie2[1] - ie1[1];
651 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
652 case BSS_CMP_HIDE_NUL:
653 if (ie1[1] != ie2[1])
654 return ie2[1] - ie1[1];
655 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */
656 for (i = 0; i < ie2[1]; i++)
663 static bool cfg80211_bss_type_match(u16 capability,
664 enum nl80211_band band,
665 enum ieee80211_bss_type bss_type)
670 if (bss_type == IEEE80211_BSS_TYPE_ANY)
673 if (band == NL80211_BAND_60GHZ) {
674 mask = WLAN_CAPABILITY_DMG_TYPE_MASK;
676 case IEEE80211_BSS_TYPE_ESS:
677 val = WLAN_CAPABILITY_DMG_TYPE_AP;
679 case IEEE80211_BSS_TYPE_PBSS:
680 val = WLAN_CAPABILITY_DMG_TYPE_PBSS;
682 case IEEE80211_BSS_TYPE_IBSS:
683 val = WLAN_CAPABILITY_DMG_TYPE_IBSS;
689 mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS;
691 case IEEE80211_BSS_TYPE_ESS:
692 val = WLAN_CAPABILITY_ESS;
694 case IEEE80211_BSS_TYPE_IBSS:
695 val = WLAN_CAPABILITY_IBSS;
697 case IEEE80211_BSS_TYPE_MBSS:
705 ret = ((capability & mask) == val);
709 /* Returned bss is reference counted and must be cleaned up appropriately. */
710 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
711 struct ieee80211_channel *channel,
713 const u8 *ssid, size_t ssid_len,
714 enum ieee80211_bss_type bss_type,
715 enum ieee80211_privacy privacy)
717 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
718 struct cfg80211_internal_bss *bss, *res = NULL;
719 unsigned long now = jiffies;
722 trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type,
725 spin_lock_bh(&rdev->bss_lock);
727 list_for_each_entry(bss, &rdev->bss_list, list) {
728 if (!cfg80211_bss_type_match(bss->pub.capability,
729 bss->pub.channel->band, bss_type))
732 bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY);
733 if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) ||
734 (privacy == IEEE80211_PRIVACY_OFF && bss_privacy))
736 if (channel && bss->pub.channel != channel)
738 if (!is_valid_ether_addr(bss->pub.bssid))
740 /* Don't get expired BSS structs */
741 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
742 !atomic_read(&bss->hold))
744 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
746 bss_ref_get(rdev, res);
751 spin_unlock_bh(&rdev->bss_lock);
754 trace_cfg80211_return_bss(&res->pub);
757 EXPORT_SYMBOL(cfg80211_get_bss);
759 static void rb_insert_bss(struct cfg80211_registered_device *rdev,
760 struct cfg80211_internal_bss *bss)
762 struct rb_node **p = &rdev->bss_tree.rb_node;
763 struct rb_node *parent = NULL;
764 struct cfg80211_internal_bss *tbss;
769 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
771 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR);
774 /* will sort of leak this BSS */
784 rb_link_node(&bss->rbn, parent, p);
785 rb_insert_color(&bss->rbn, &rdev->bss_tree);
788 static struct cfg80211_internal_bss *
789 rb_find_bss(struct cfg80211_registered_device *rdev,
790 struct cfg80211_internal_bss *res,
791 enum bss_compare_mode mode)
793 struct rb_node *n = rdev->bss_tree.rb_node;
794 struct cfg80211_internal_bss *bss;
798 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
799 r = cmp_bss(&res->pub, &bss->pub, mode);
812 static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev,
813 struct cfg80211_internal_bss *new)
815 const struct cfg80211_bss_ies *ies;
816 struct cfg80211_internal_bss *bss;
822 ies = rcu_access_pointer(new->pub.beacon_ies);
826 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
833 for (i = 0; i < ssidlen; i++)
837 /* not a hidden SSID */
841 /* This is the bad part ... */
843 list_for_each_entry(bss, &rdev->bss_list, list) {
845 * we're iterating all the entries anyway, so take the
846 * opportunity to validate the list length accounting
850 if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid))
852 if (bss->pub.channel != new->pub.channel)
854 if (bss->pub.scan_width != new->pub.scan_width)
856 if (rcu_access_pointer(bss->pub.beacon_ies))
858 ies = rcu_access_pointer(bss->pub.ies);
861 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
864 if (ssidlen && ie[1] != ssidlen)
866 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss))
868 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list)))
869 list_del(&bss->hidden_list);
871 list_add(&bss->hidden_list, &new->hidden_list);
872 bss->pub.hidden_beacon_bss = &new->pub;
873 new->refcount += bss->refcount;
874 rcu_assign_pointer(bss->pub.beacon_ies,
875 new->pub.beacon_ies);
878 WARN_ONCE(n_entries != rdev->bss_entries,
879 "rdev bss entries[%d]/list[len:%d] corruption\n",
880 rdev->bss_entries, n_entries);
885 /* Returned bss is reference counted and must be cleaned up appropriately. */
886 static struct cfg80211_internal_bss *
887 cfg80211_bss_update(struct cfg80211_registered_device *rdev,
888 struct cfg80211_internal_bss *tmp,
891 struct cfg80211_internal_bss *found = NULL;
893 if (WARN_ON(!tmp->pub.channel))
898 spin_lock_bh(&rdev->bss_lock);
900 if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
901 spin_unlock_bh(&rdev->bss_lock);
905 found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR);
909 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
910 const struct cfg80211_bss_ies *old;
912 old = rcu_access_pointer(found->pub.proberesp_ies);
914 rcu_assign_pointer(found->pub.proberesp_ies,
915 tmp->pub.proberesp_ies);
916 /* Override possible earlier Beacon frame IEs */
917 rcu_assign_pointer(found->pub.ies,
918 tmp->pub.proberesp_ies);
920 kfree_rcu((struct cfg80211_bss_ies *)old,
922 } else if (rcu_access_pointer(tmp->pub.beacon_ies)) {
923 const struct cfg80211_bss_ies *old;
924 struct cfg80211_internal_bss *bss;
926 if (found->pub.hidden_beacon_bss &&
927 !list_empty(&found->hidden_list)) {
928 const struct cfg80211_bss_ies *f;
931 * The found BSS struct is one of the probe
932 * response members of a group, but we're
933 * receiving a beacon (beacon_ies in the tmp
934 * bss is used). This can only mean that the
935 * AP changed its beacon from not having an
936 * SSID to showing it, which is confusing so
937 * drop this information.
940 f = rcu_access_pointer(tmp->pub.beacon_ies);
941 kfree_rcu((struct cfg80211_bss_ies *)f,
946 old = rcu_access_pointer(found->pub.beacon_ies);
948 rcu_assign_pointer(found->pub.beacon_ies,
949 tmp->pub.beacon_ies);
951 /* Override IEs if they were from a beacon before */
952 if (old == rcu_access_pointer(found->pub.ies))
953 rcu_assign_pointer(found->pub.ies,
954 tmp->pub.beacon_ies);
956 /* Assign beacon IEs to all sub entries */
957 list_for_each_entry(bss, &found->hidden_list,
959 const struct cfg80211_bss_ies *ies;
961 ies = rcu_access_pointer(bss->pub.beacon_ies);
964 rcu_assign_pointer(bss->pub.beacon_ies,
965 tmp->pub.beacon_ies);
969 kfree_rcu((struct cfg80211_bss_ies *)old,
973 found->pub.beacon_interval = tmp->pub.beacon_interval;
975 * don't update the signal if beacon was heard on
979 found->pub.signal = tmp->pub.signal;
980 found->pub.capability = tmp->pub.capability;
982 found->ts_boottime = tmp->ts_boottime;
983 found->parent_tsf = tmp->parent_tsf;
984 ether_addr_copy(found->parent_bssid, tmp->parent_bssid);
986 struct cfg80211_internal_bss *new;
987 struct cfg80211_internal_bss *hidden;
988 struct cfg80211_bss_ies *ies;
991 * create a copy -- the "res" variable that is passed in
992 * is allocated on the stack since it's not needed in the
993 * more common case of an update
995 new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size,
998 ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
1000 kfree_rcu(ies, rcu_head);
1001 ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
1003 kfree_rcu(ies, rcu_head);
1006 memcpy(new, tmp, sizeof(*new));
1008 INIT_LIST_HEAD(&new->hidden_list);
1010 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
1011 hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
1013 hidden = rb_find_bss(rdev, tmp,
1016 new->pub.hidden_beacon_bss = &hidden->pub;
1017 list_add(&new->hidden_list,
1018 &hidden->hidden_list);
1020 rcu_assign_pointer(new->pub.beacon_ies,
1021 hidden->pub.beacon_ies);
1025 * Ok so we found a beacon, and don't have an entry. If
1026 * it's a beacon with hidden SSID, we might be in for an
1027 * expensive search for any probe responses that should
1028 * be grouped with this beacon for updates ...
1030 if (!cfg80211_combine_bsses(rdev, new)) {
1036 if (rdev->bss_entries >= bss_entries_limit &&
1037 !cfg80211_bss_expire_oldest(rdev)) {
1042 list_add_tail(&new->list, &rdev->bss_list);
1043 rdev->bss_entries++;
1044 rb_insert_bss(rdev, new);
1048 rdev->bss_generation++;
1049 bss_ref_get(rdev, found);
1050 spin_unlock_bh(&rdev->bss_lock);
1054 spin_unlock_bh(&rdev->bss_lock);
1058 static struct ieee80211_channel *
1059 cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
1060 struct ieee80211_channel *channel)
1064 int channel_number = -1;
1066 tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen);
1067 if (tmp && tmp[1] == 1) {
1068 channel_number = tmp[2];
1070 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen);
1071 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) {
1072 struct ieee80211_ht_operation *htop = (void *)(tmp + 2);
1074 channel_number = htop->primary_chan;
1078 if (channel_number < 0)
1081 freq = ieee80211_channel_to_frequency(channel_number, channel->band);
1082 channel = ieee80211_get_channel(wiphy, freq);
1085 if (channel->flags & IEEE80211_CHAN_DISABLED)
1090 /* Returned bss is reference counted and must be cleaned up appropriately. */
1091 struct cfg80211_bss *
1092 cfg80211_inform_bss_data(struct wiphy *wiphy,
1093 struct cfg80211_inform_bss *data,
1094 enum cfg80211_bss_frame_type ftype,
1095 const u8 *bssid, u64 tsf, u16 capability,
1096 u16 beacon_interval, const u8 *ie, size_t ielen,
1099 struct cfg80211_bss_ies *ies;
1100 struct ieee80211_channel *channel;
1101 struct cfg80211_internal_bss tmp = {}, *res;
1105 if (WARN_ON(!wiphy))
1108 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
1109 (data->signal < 0 || data->signal > 100)))
1112 channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan);
1116 memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
1117 tmp.pub.channel = channel;
1118 tmp.pub.scan_width = data->scan_width;
1119 tmp.pub.signal = data->signal;
1120 tmp.pub.beacon_interval = beacon_interval;
1121 tmp.pub.capability = capability;
1122 tmp.ts_boottime = data->boottime_ns;
1125 * If we do not know here whether the IEs are from a Beacon or Probe
1126 * Response frame, we need to pick one of the options and only use it
1127 * with the driver that does not provide the full Beacon/Probe Response
1128 * frame. Use Beacon frame pointer to avoid indicating that this should
1129 * override the IEs pointer should we have received an earlier
1130 * indication of Probe Response data.
1132 ies = kzalloc(sizeof(*ies) + ielen, gfp);
1137 ies->from_beacon = false;
1138 memcpy(ies->data, ie, ielen);
1141 case CFG80211_BSS_FTYPE_BEACON:
1142 ies->from_beacon = true;
1143 /* fall through to assign */
1144 case CFG80211_BSS_FTYPE_UNKNOWN:
1145 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1147 case CFG80211_BSS_FTYPE_PRESP:
1148 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1151 rcu_assign_pointer(tmp.pub.ies, ies);
1153 signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
1154 wiphy->max_adj_channel_rssi_comp;
1155 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
1159 if (channel->band == NL80211_BAND_60GHZ) {
1160 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1161 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1162 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1163 regulatory_hint_found_beacon(wiphy, channel, gfp);
1165 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1166 regulatory_hint_found_beacon(wiphy, channel, gfp);
1169 trace_cfg80211_return_bss(&res->pub);
1170 /* cfg80211_bss_update gives us a referenced result */
1173 EXPORT_SYMBOL(cfg80211_inform_bss_data);
1175 /* cfg80211_inform_bss_width_frame helper */
1176 struct cfg80211_bss *
1177 cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
1178 struct cfg80211_inform_bss *data,
1179 struct ieee80211_mgmt *mgmt, size_t len,
1183 struct cfg80211_internal_bss tmp = {}, *res;
1184 struct cfg80211_bss_ies *ies;
1185 struct ieee80211_channel *channel;
1187 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1188 u.probe_resp.variable);
1191 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
1192 offsetof(struct ieee80211_mgmt, u.beacon.variable));
1194 trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len);
1199 if (WARN_ON(!wiphy))
1202 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
1203 (data->signal < 0 || data->signal > 100)))
1206 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
1209 channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable,
1214 ies = kzalloc(sizeof(*ies) + ielen, gfp);
1218 ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
1219 ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
1220 memcpy(ies->data, mgmt->u.probe_resp.variable, ielen);
1222 if (ieee80211_is_probe_resp(mgmt->frame_control))
1223 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1225 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1226 rcu_assign_pointer(tmp.pub.ies, ies);
1228 memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN);
1229 tmp.pub.channel = channel;
1230 tmp.pub.scan_width = data->scan_width;
1231 tmp.pub.signal = data->signal;
1232 tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
1233 tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
1234 tmp.ts_boottime = data->boottime_ns;
1235 tmp.parent_tsf = data->parent_tsf;
1236 ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
1238 signal_valid = abs(data->chan->center_freq - channel->center_freq) <=
1239 wiphy->max_adj_channel_rssi_comp;
1240 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid);
1244 if (channel->band == NL80211_BAND_60GHZ) {
1245 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1246 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1247 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1248 regulatory_hint_found_beacon(wiphy, channel, gfp);
1250 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1251 regulatory_hint_found_beacon(wiphy, channel, gfp);
1254 trace_cfg80211_return_bss(&res->pub);
1255 /* cfg80211_bss_update gives us a referenced result */
1258 EXPORT_SYMBOL(cfg80211_inform_bss_frame_data);
1260 void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1262 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1263 struct cfg80211_internal_bss *bss;
1268 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1270 spin_lock_bh(&rdev->bss_lock);
1271 bss_ref_get(rdev, bss);
1272 spin_unlock_bh(&rdev->bss_lock);
1274 EXPORT_SYMBOL(cfg80211_ref_bss);
1276 void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1278 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1279 struct cfg80211_internal_bss *bss;
1284 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1286 spin_lock_bh(&rdev->bss_lock);
1287 bss_ref_put(rdev, bss);
1288 spin_unlock_bh(&rdev->bss_lock);
1290 EXPORT_SYMBOL(cfg80211_put_bss);
1292 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1294 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1295 struct cfg80211_internal_bss *bss;
1300 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1302 spin_lock_bh(&rdev->bss_lock);
1303 if (!list_empty(&bss->list)) {
1304 if (__cfg80211_unlink_bss(rdev, bss))
1305 rdev->bss_generation++;
1307 spin_unlock_bh(&rdev->bss_lock);
1309 EXPORT_SYMBOL(cfg80211_unlink_bss);
1311 #ifdef CONFIG_CFG80211_WEXT
1312 static struct cfg80211_registered_device *
1313 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
1315 struct cfg80211_registered_device *rdev;
1316 struct net_device *dev;
1320 dev = dev_get_by_index(net, ifindex);
1322 return ERR_PTR(-ENODEV);
1323 if (dev->ieee80211_ptr)
1324 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
1326 rdev = ERR_PTR(-ENODEV);
1331 int cfg80211_wext_siwscan(struct net_device *dev,
1332 struct iw_request_info *info,
1333 union iwreq_data *wrqu, char *extra)
1335 struct cfg80211_registered_device *rdev;
1336 struct wiphy *wiphy;
1337 struct iw_scan_req *wreq = NULL;
1338 struct cfg80211_scan_request *creq = NULL;
1339 int i, err, n_channels = 0;
1340 enum nl80211_band band;
1342 if (!netif_running(dev))
1345 if (wrqu->data.length == sizeof(struct iw_scan_req))
1346 wreq = (struct iw_scan_req *)extra;
1348 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1351 return PTR_ERR(rdev);
1353 if (rdev->scan_req || rdev->scan_msg) {
1358 wiphy = &rdev->wiphy;
1360 /* Determine number of channels, needed to allocate creq */
1361 if (wreq && wreq->num_channels)
1362 n_channels = wreq->num_channels;
1364 n_channels = ieee80211_get_num_supported_channels(wiphy);
1366 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
1367 n_channels * sizeof(void *),
1374 creq->wiphy = wiphy;
1375 creq->wdev = dev->ieee80211_ptr;
1376 /* SSIDs come after channels */
1377 creq->ssids = (void *)&creq->channels[n_channels];
1378 creq->n_channels = n_channels;
1380 creq->scan_start = jiffies;
1382 /* translate "Scan on frequencies" request */
1384 for (band = 0; band < NUM_NL80211_BANDS; band++) {
1387 if (!wiphy->bands[band])
1390 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
1391 /* ignore disabled channels */
1392 if (wiphy->bands[band]->channels[j].flags &
1393 IEEE80211_CHAN_DISABLED)
1396 /* If we have a wireless request structure and the
1397 * wireless request specifies frequencies, then search
1398 * for the matching hardware channel.
1400 if (wreq && wreq->num_channels) {
1402 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
1403 for (k = 0; k < wreq->num_channels; k++) {
1404 struct iw_freq *freq =
1405 &wreq->channel_list[k];
1407 cfg80211_wext_freq(freq);
1409 if (wext_freq == wiphy_freq)
1410 goto wext_freq_found;
1412 goto wext_freq_not_found;
1416 creq->channels[i] = &wiphy->bands[band]->channels[j];
1418 wext_freq_not_found: ;
1421 /* No channels found? */
1427 /* Set real number of channels specified in creq->channels[] */
1428 creq->n_channels = i;
1430 /* translate "Scan for SSID" request */
1432 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
1433 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
1437 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
1438 creq->ssids[0].ssid_len = wreq->essid_len;
1440 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
1444 for (i = 0; i < NUM_NL80211_BANDS; i++)
1445 if (wiphy->bands[i])
1446 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
1448 eth_broadcast_addr(creq->bssid);
1450 rdev->scan_req = creq;
1451 err = rdev_scan(rdev, creq);
1453 rdev->scan_req = NULL;
1454 /* creq will be freed below */
1456 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
1457 /* creq now owned by driver */
1465 EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
1467 static char *ieee80211_scan_add_ies(struct iw_request_info *info,
1468 const struct cfg80211_bss_ies *ies,
1469 char *current_ev, char *end_buf)
1471 const u8 *pos, *end, *next;
1472 struct iw_event iwe;
1478 * If needed, fragment the IEs buffer (at IE boundaries) into short
1479 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
1482 end = pos + ies->len;
1484 while (end - pos > IW_GENERIC_IE_MAX) {
1485 next = pos + 2 + pos[1];
1486 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
1487 next = next + 2 + next[1];
1489 memset(&iwe, 0, sizeof(iwe));
1490 iwe.cmd = IWEVGENIE;
1491 iwe.u.data.length = next - pos;
1492 current_ev = iwe_stream_add_point_check(info, current_ev,
1495 if (IS_ERR(current_ev))
1501 memset(&iwe, 0, sizeof(iwe));
1502 iwe.cmd = IWEVGENIE;
1503 iwe.u.data.length = end - pos;
1504 current_ev = iwe_stream_add_point_check(info, current_ev,
1507 if (IS_ERR(current_ev))
1515 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
1516 struct cfg80211_internal_bss *bss, char *current_ev,
1519 const struct cfg80211_bss_ies *ies;
1520 struct iw_event iwe;
1525 bool ismesh = false;
1527 memset(&iwe, 0, sizeof(iwe));
1528 iwe.cmd = SIOCGIWAP;
1529 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1530 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
1531 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
1533 if (IS_ERR(current_ev))
1536 memset(&iwe, 0, sizeof(iwe));
1537 iwe.cmd = SIOCGIWFREQ;
1538 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
1540 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
1542 if (IS_ERR(current_ev))
1545 memset(&iwe, 0, sizeof(iwe));
1546 iwe.cmd = SIOCGIWFREQ;
1547 iwe.u.freq.m = bss->pub.channel->center_freq;
1549 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
1551 if (IS_ERR(current_ev))
1554 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
1555 memset(&iwe, 0, sizeof(iwe));
1557 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
1558 IW_QUAL_NOISE_INVALID |
1559 IW_QUAL_QUAL_UPDATED;
1560 switch (wiphy->signal_type) {
1561 case CFG80211_SIGNAL_TYPE_MBM:
1562 sig = bss->pub.signal / 100;
1563 iwe.u.qual.level = sig;
1564 iwe.u.qual.updated |= IW_QUAL_DBM;
1565 if (sig < -110) /* rather bad */
1567 else if (sig > -40) /* perfect */
1569 /* will give a range of 0 .. 70 */
1570 iwe.u.qual.qual = sig + 110;
1572 case CFG80211_SIGNAL_TYPE_UNSPEC:
1573 iwe.u.qual.level = bss->pub.signal;
1574 /* will give range 0 .. 100 */
1575 iwe.u.qual.qual = bss->pub.signal;
1581 current_ev = iwe_stream_add_event_check(info, current_ev,
1584 if (IS_ERR(current_ev))
1588 memset(&iwe, 0, sizeof(iwe));
1589 iwe.cmd = SIOCGIWENCODE;
1590 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
1591 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1593 iwe.u.data.flags = IW_ENCODE_DISABLED;
1594 iwe.u.data.length = 0;
1595 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
1597 if (IS_ERR(current_ev))
1601 ies = rcu_dereference(bss->pub.ies);
1607 if (ie[1] > rem - 2)
1612 memset(&iwe, 0, sizeof(iwe));
1613 iwe.cmd = SIOCGIWESSID;
1614 iwe.u.data.length = ie[1];
1615 iwe.u.data.flags = 1;
1616 current_ev = iwe_stream_add_point_check(info,
1620 if (IS_ERR(current_ev))
1623 case WLAN_EID_MESH_ID:
1624 memset(&iwe, 0, sizeof(iwe));
1625 iwe.cmd = SIOCGIWESSID;
1626 iwe.u.data.length = ie[1];
1627 iwe.u.data.flags = 1;
1628 current_ev = iwe_stream_add_point_check(info,
1632 if (IS_ERR(current_ev))
1635 case WLAN_EID_MESH_CONFIG:
1637 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
1640 memset(&iwe, 0, sizeof(iwe));
1641 iwe.cmd = IWEVCUSTOM;
1642 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
1644 iwe.u.data.length = strlen(buf);
1645 current_ev = iwe_stream_add_point_check(info,
1649 if (IS_ERR(current_ev))
1651 sprintf(buf, "Path Selection Metric ID: 0x%02X",
1653 iwe.u.data.length = strlen(buf);
1654 current_ev = iwe_stream_add_point_check(info,
1658 if (IS_ERR(current_ev))
1660 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
1662 iwe.u.data.length = strlen(buf);
1663 current_ev = iwe_stream_add_point_check(info,
1667 if (IS_ERR(current_ev))
1669 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
1670 iwe.u.data.length = strlen(buf);
1671 current_ev = iwe_stream_add_point_check(info,
1675 if (IS_ERR(current_ev))
1677 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
1678 iwe.u.data.length = strlen(buf);
1679 current_ev = iwe_stream_add_point_check(info,
1683 if (IS_ERR(current_ev))
1685 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
1686 iwe.u.data.length = strlen(buf);
1687 current_ev = iwe_stream_add_point_check(info,
1691 if (IS_ERR(current_ev))
1693 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
1694 iwe.u.data.length = strlen(buf);
1695 current_ev = iwe_stream_add_point_check(info,
1699 if (IS_ERR(current_ev))
1702 case WLAN_EID_SUPP_RATES:
1703 case WLAN_EID_EXT_SUPP_RATES:
1704 /* display all supported rates in readable format */
1705 p = current_ev + iwe_stream_lcp_len(info);
1707 memset(&iwe, 0, sizeof(iwe));
1708 iwe.cmd = SIOCGIWRATE;
1709 /* Those two flags are ignored... */
1710 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
1712 for (i = 0; i < ie[1]; i++) {
1713 iwe.u.bitrate.value =
1714 ((ie[i + 2] & 0x7f) * 500000);
1716 p = iwe_stream_add_value(info, current_ev, p,
1720 current_ev = ERR_PTR(-E2BIG);
1731 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
1733 memset(&iwe, 0, sizeof(iwe));
1734 iwe.cmd = SIOCGIWMODE;
1736 iwe.u.mode = IW_MODE_MESH;
1737 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
1738 iwe.u.mode = IW_MODE_MASTER;
1740 iwe.u.mode = IW_MODE_ADHOC;
1741 current_ev = iwe_stream_add_event_check(info, current_ev,
1744 if (IS_ERR(current_ev))
1748 memset(&iwe, 0, sizeof(iwe));
1749 iwe.cmd = IWEVCUSTOM;
1750 sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
1751 iwe.u.data.length = strlen(buf);
1752 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
1754 if (IS_ERR(current_ev))
1756 memset(&iwe, 0, sizeof(iwe));
1757 iwe.cmd = IWEVCUSTOM;
1758 sprintf(buf, " Last beacon: %ums ago",
1759 elapsed_jiffies_msecs(bss->ts));
1760 iwe.u.data.length = strlen(buf);
1761 current_ev = iwe_stream_add_point_check(info, current_ev,
1762 end_buf, &iwe, buf);
1763 if (IS_ERR(current_ev))
1766 current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
1774 static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
1775 struct iw_request_info *info,
1776 char *buf, size_t len)
1778 char *current_ev = buf;
1779 char *end_buf = buf + len;
1780 struct cfg80211_internal_bss *bss;
1783 spin_lock_bh(&rdev->bss_lock);
1784 cfg80211_bss_expire(rdev);
1786 list_for_each_entry(bss, &rdev->bss_list, list) {
1787 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
1791 current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
1792 current_ev, end_buf);
1793 if (IS_ERR(current_ev)) {
1794 err = PTR_ERR(current_ev);
1798 spin_unlock_bh(&rdev->bss_lock);
1802 return current_ev - buf;
1806 int cfg80211_wext_giwscan(struct net_device *dev,
1807 struct iw_request_info *info,
1808 struct iw_point *data, char *extra)
1810 struct cfg80211_registered_device *rdev;
1813 if (!netif_running(dev))
1816 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
1819 return PTR_ERR(rdev);
1821 if (rdev->scan_req || rdev->scan_msg)
1824 res = ieee80211_scan_results(rdev, info, extra, data->length);
1833 EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan);