1 // SPDX-License-Identifier: GPL-2.0
3 * cfg80211 scan result handling
5 * Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
7 * Copyright 2016 Intel Deutschland GmbH
8 * Copyright (C) 2018-2019 Intel Corporation
10 #include <linux/kernel.h>
11 #include <linux/slab.h>
12 #include <linux/module.h>
13 #include <linux/netdevice.h>
14 #include <linux/wireless.h>
15 #include <linux/nl80211.h>
16 #include <linux/etherdevice.h>
18 #include <net/cfg80211.h>
19 #include <net/cfg80211-wext.h>
20 #include <net/iw_handler.h>
23 #include "wext-compat.h"
27 * DOC: BSS tree/list structure
29 * At the top level, the BSS list is kept in both a list in each
30 * registered device (@bss_list) as well as an RB-tree for faster
31 * lookup. In the RB-tree, entries can be looked up using their
32 * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID
35 * Due to the possibility of hidden SSIDs, there's a second level
36 * structure, the "hidden_list" and "hidden_beacon_bss" pointer.
37 * The hidden_list connects all BSSes belonging to a single AP
38 * that has a hidden SSID, and connects beacon and probe response
39 * entries. For a probe response entry for a hidden SSID, the
40 * hidden_beacon_bss pointer points to the BSS struct holding the
41 * beacon's information.
43 * Reference counting is done for all these references except for
44 * the hidden_list, so that a beacon BSS struct that is otherwise
45 * not referenced has one reference for being on the bss_list and
46 * one for each probe response entry that points to it using the
47 * hidden_beacon_bss pointer. When a BSS struct that has such a
48 * pointer is get/put, the refcount update is also propagated to
49 * the referenced struct, this ensure that it cannot get removed
50 * while somebody is using the probe response version.
52 * Note that the hidden_beacon_bss pointer never changes, due to
53 * the reference counting. Therefore, no locking is needed for
56 * Also note that the hidden_beacon_bss pointer is only relevant
57 * if the driver uses something other than the IEs, e.g. private
58 * data stored stored in the BSS struct, since the beacon IEs are
59 * also linked into the probe response struct.
63 * Limit the number of BSS entries stored in mac80211. Each one is
64 * a bit over 4k at most, so this limits to roughly 4-5M of memory.
65 * If somebody wants to really attack this though, they'd likely
66 * use small beacons, and only one type of frame, limiting each of
67 * the entries to a much smaller size (in order to generate more
68 * entries in total, so overhead is bigger.)
70 static int bss_entries_limit = 1000;
71 module_param(bss_entries_limit, int, 0644);
72 MODULE_PARM_DESC(bss_entries_limit,
73 "limit to number of scan BSS entries (per wiphy, default 1000)");
75 #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ)
77 static void bss_free(struct cfg80211_internal_bss *bss)
79 struct cfg80211_bss_ies *ies;
81 if (WARN_ON(atomic_read(&bss->hold)))
84 ies = (void *)rcu_access_pointer(bss->pub.beacon_ies);
85 if (ies && !bss->pub.hidden_beacon_bss)
86 kfree_rcu(ies, rcu_head);
87 ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies);
89 kfree_rcu(ies, rcu_head);
92 * This happens when the module is removed, it doesn't
93 * really matter any more save for completeness
95 if (!list_empty(&bss->hidden_list))
96 list_del(&bss->hidden_list);
101 static inline void bss_ref_get(struct cfg80211_registered_device *rdev,
102 struct cfg80211_internal_bss *bss)
104 lockdep_assert_held(&rdev->bss_lock);
107 if (bss->pub.hidden_beacon_bss) {
108 bss = container_of(bss->pub.hidden_beacon_bss,
109 struct cfg80211_internal_bss,
113 if (bss->pub.transmitted_bss) {
114 bss = container_of(bss->pub.transmitted_bss,
115 struct cfg80211_internal_bss,
121 static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
122 struct cfg80211_internal_bss *bss)
124 lockdep_assert_held(&rdev->bss_lock);
126 if (bss->pub.hidden_beacon_bss) {
127 struct cfg80211_internal_bss *hbss;
128 hbss = container_of(bss->pub.hidden_beacon_bss,
129 struct cfg80211_internal_bss,
132 if (hbss->refcount == 0)
136 if (bss->pub.transmitted_bss) {
137 struct cfg80211_internal_bss *tbss;
139 tbss = container_of(bss->pub.transmitted_bss,
140 struct cfg80211_internal_bss,
143 if (tbss->refcount == 0)
148 if (bss->refcount == 0)
152 static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev,
153 struct cfg80211_internal_bss *bss)
155 lockdep_assert_held(&rdev->bss_lock);
157 if (!list_empty(&bss->hidden_list)) {
159 * don't remove the beacon entry if it has
160 * probe responses associated with it
162 if (!bss->pub.hidden_beacon_bss)
165 * if it's a probe response entry break its
166 * link to the other entries in the group
168 list_del_init(&bss->hidden_list);
171 list_del_init(&bss->list);
172 list_del_init(&bss->pub.nontrans_list);
173 rb_erase(&bss->rbn, &rdev->bss_tree);
175 WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list),
176 "rdev bss entries[%d]/list[empty:%d] corruption\n",
177 rdev->bss_entries, list_empty(&rdev->bss_list));
178 bss_ref_put(rdev, bss);
182 bool cfg80211_is_element_inherited(const struct element *elem,
183 const struct element *non_inherit_elem)
185 u8 id_len, ext_id_len, i, loop_len, id;
188 if (elem->id == WLAN_EID_MULTIPLE_BSSID)
191 if (!non_inherit_elem || non_inherit_elem->datalen < 2)
195 * non inheritance element format is:
196 * ext ID (56) | IDs list len | list | extension IDs list len | list
197 * Both lists are optional. Both lengths are mandatory.
198 * This means valid length is:
199 * elem_len = 1 (extension ID) + 2 (list len fields) + list lengths
201 id_len = non_inherit_elem->data[1];
202 if (non_inherit_elem->datalen < 3 + id_len)
205 ext_id_len = non_inherit_elem->data[2 + id_len];
206 if (non_inherit_elem->datalen < 3 + id_len + ext_id_len)
209 if (elem->id == WLAN_EID_EXTENSION) {
212 loop_len = ext_id_len;
213 list = &non_inherit_elem->data[3 + id_len];
219 list = &non_inherit_elem->data[2];
223 for (i = 0; i < loop_len; i++) {
230 EXPORT_SYMBOL(cfg80211_is_element_inherited);
232 static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen,
233 const u8 *subelement, size_t subie_len,
234 u8 *new_ie, gfp_t gfp)
237 const u8 *tmp_old, *tmp_new;
238 const struct element *non_inherit_elem;
241 /* copy subelement as we need to change its content to
242 * mark an ie after it is processed.
244 sub_copy = kmemdup(subelement, subie_len, gfp);
251 tmp_new = cfg80211_find_ie(WLAN_EID_SSID, sub_copy, subie_len);
253 memcpy(pos, tmp_new, tmp_new[1] + 2);
254 pos += (tmp_new[1] + 2);
257 /* get non inheritance list if exists */
259 cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE,
260 sub_copy, subie_len);
262 /* go through IEs in ie (skip SSID) and subelement,
263 * merge them into new_ie
265 tmp_old = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
266 tmp_old = (tmp_old) ? tmp_old + tmp_old[1] + 2 : ie;
268 while (tmp_old + tmp_old[1] + 2 - ie <= ielen) {
269 if (tmp_old[0] == 0) {
274 if (tmp_old[0] == WLAN_EID_EXTENSION)
275 tmp = (u8 *)cfg80211_find_ext_ie(tmp_old[2], sub_copy,
278 tmp = (u8 *)cfg80211_find_ie(tmp_old[0], sub_copy,
282 const struct element *old_elem = (void *)tmp_old;
284 /* ie in old ie but not in subelement */
285 if (cfg80211_is_element_inherited(old_elem,
287 memcpy(pos, tmp_old, tmp_old[1] + 2);
288 pos += tmp_old[1] + 2;
291 /* ie in transmitting ie also in subelement,
292 * copy from subelement and flag the ie in subelement
293 * as copied (by setting eid field to WLAN_EID_SSID,
294 * which is skipped anyway).
295 * For vendor ie, compare OUI + type + subType to
296 * determine if they are the same ie.
298 if (tmp_old[0] == WLAN_EID_VENDOR_SPECIFIC) {
299 if (!memcmp(tmp_old + 2, tmp + 2, 5)) {
300 /* same vendor ie, copy from
303 memcpy(pos, tmp, tmp[1] + 2);
305 tmp[0] = WLAN_EID_SSID;
307 memcpy(pos, tmp_old, tmp_old[1] + 2);
308 pos += tmp_old[1] + 2;
311 /* copy ie from subelement into new ie */
312 memcpy(pos, tmp, tmp[1] + 2);
314 tmp[0] = WLAN_EID_SSID;
318 if (tmp_old + tmp_old[1] + 2 - ie == ielen)
321 tmp_old += tmp_old[1] + 2;
324 /* go through subelement again to check if there is any ie not
325 * copied to new ie, skip ssid, capability, bssid-index ie
328 while (tmp_new + tmp_new[1] + 2 - sub_copy <= subie_len) {
329 if (!(tmp_new[0] == WLAN_EID_NON_TX_BSSID_CAP ||
330 tmp_new[0] == WLAN_EID_SSID)) {
331 memcpy(pos, tmp_new, tmp_new[1] + 2);
332 pos += tmp_new[1] + 2;
334 if (tmp_new + tmp_new[1] + 2 - sub_copy == subie_len)
336 tmp_new += tmp_new[1] + 2;
343 static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
344 const u8 *ssid, size_t ssid_len)
346 const struct cfg80211_bss_ies *ies;
349 if (bssid && !ether_addr_equal(a->bssid, bssid))
355 ies = rcu_access_pointer(a->ies);
358 ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
361 if (ssidie[1] != ssid_len)
363 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
367 cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss,
368 struct cfg80211_bss *nontrans_bss)
372 struct cfg80211_bss *bss = NULL;
375 ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
384 /* check if nontrans_bss is in the list */
385 list_for_each_entry(bss, &trans_bss->nontrans_list, nontrans_list) {
386 if (is_bss(bss, nontrans_bss->bssid, ssid, ssid_len))
390 /* add to the list */
391 list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list);
395 static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev,
396 unsigned long expire_time)
398 struct cfg80211_internal_bss *bss, *tmp;
399 bool expired = false;
401 lockdep_assert_held(&rdev->bss_lock);
403 list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) {
404 if (atomic_read(&bss->hold))
406 if (!time_after(expire_time, bss->ts))
409 if (__cfg80211_unlink_bss(rdev, bss))
414 rdev->bss_generation++;
417 static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev)
419 struct cfg80211_internal_bss *bss, *oldest = NULL;
422 lockdep_assert_held(&rdev->bss_lock);
424 list_for_each_entry(bss, &rdev->bss_list, list) {
425 if (atomic_read(&bss->hold))
428 if (!list_empty(&bss->hidden_list) &&
429 !bss->pub.hidden_beacon_bss)
432 if (oldest && time_before(oldest->ts, bss->ts))
437 if (WARN_ON(!oldest))
441 * The callers make sure to increase rdev->bss_generation if anything
442 * gets removed (and a new entry added), so there's no need to also do
446 ret = __cfg80211_unlink_bss(rdev, oldest);
451 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
454 struct cfg80211_scan_request *request;
455 struct wireless_dev *wdev;
457 #ifdef CONFIG_CFG80211_WEXT
458 union iwreq_data wrqu;
463 if (rdev->scan_msg) {
464 nl80211_send_scan_msg(rdev, rdev->scan_msg);
465 rdev->scan_msg = NULL;
469 request = rdev->scan_req;
473 wdev = request->wdev;
476 * This must be before sending the other events!
477 * Otherwise, wpa_supplicant gets completely confused with
481 cfg80211_sme_scan_done(wdev->netdev);
483 if (!request->info.aborted &&
484 request->flags & NL80211_SCAN_FLAG_FLUSH) {
485 /* flush entries from previous scans */
486 spin_lock_bh(&rdev->bss_lock);
487 __cfg80211_bss_expire(rdev, request->scan_start);
488 spin_unlock_bh(&rdev->bss_lock);
491 msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted);
493 #ifdef CONFIG_CFG80211_WEXT
494 if (wdev->netdev && !request->info.aborted) {
495 memset(&wrqu, 0, sizeof(wrqu));
497 wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
502 dev_put(wdev->netdev);
504 rdev->scan_req = NULL;
508 rdev->scan_msg = msg;
510 nl80211_send_scan_msg(rdev, msg);
513 void __cfg80211_scan_done(struct work_struct *wk)
515 struct cfg80211_registered_device *rdev;
517 rdev = container_of(wk, struct cfg80211_registered_device,
521 ___cfg80211_scan_done(rdev, true);
525 void cfg80211_scan_done(struct cfg80211_scan_request *request,
526 struct cfg80211_scan_info *info)
528 trace_cfg80211_scan_done(request, info);
529 WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req);
531 request->info = *info;
532 request->notified = true;
533 queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk);
535 EXPORT_SYMBOL(cfg80211_scan_done);
537 void cfg80211_add_sched_scan_req(struct cfg80211_registered_device *rdev,
538 struct cfg80211_sched_scan_request *req)
542 list_add_rcu(&req->list, &rdev->sched_scan_req_list);
545 static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device *rdev,
546 struct cfg80211_sched_scan_request *req)
550 list_del_rcu(&req->list);
551 kfree_rcu(req, rcu_head);
554 static struct cfg80211_sched_scan_request *
555 cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid)
557 struct cfg80211_sched_scan_request *pos;
559 list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list,
560 lockdep_rtnl_is_held()) {
561 if (pos->reqid == reqid)
568 * Determines if a scheduled scan request can be handled. When a legacy
569 * scheduled scan is running no other scheduled scan is allowed regardless
570 * whether the request is for legacy or multi-support scan. When a multi-support
571 * scheduled scan is running a request for legacy scan is not allowed. In this
572 * case a request for multi-support scan can be handled if resources are
573 * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached.
575 int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev,
578 struct cfg80211_sched_scan_request *pos;
581 list_for_each_entry(pos, &rdev->sched_scan_req_list, list) {
582 /* request id zero means legacy in progress */
583 if (!i && !pos->reqid)
589 /* no legacy allowed when multi request(s) are active */
593 /* resource limit reached */
594 if (i == rdev->wiphy.max_sched_scan_reqs)
600 void cfg80211_sched_scan_results_wk(struct work_struct *work)
602 struct cfg80211_registered_device *rdev;
603 struct cfg80211_sched_scan_request *req, *tmp;
605 rdev = container_of(work, struct cfg80211_registered_device,
609 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
610 if (req->report_results) {
611 req->report_results = false;
612 if (req->flags & NL80211_SCAN_FLAG_FLUSH) {
613 /* flush entries from previous scans */
614 spin_lock_bh(&rdev->bss_lock);
615 __cfg80211_bss_expire(rdev, req->scan_start);
616 spin_unlock_bh(&rdev->bss_lock);
617 req->scan_start = jiffies;
619 nl80211_send_sched_scan(req,
620 NL80211_CMD_SCHED_SCAN_RESULTS);
626 void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid)
628 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
629 struct cfg80211_sched_scan_request *request;
631 trace_cfg80211_sched_scan_results(wiphy, reqid);
632 /* ignore if we're not scanning */
635 request = cfg80211_find_sched_scan_req(rdev, reqid);
637 request->report_results = true;
638 queue_work(cfg80211_wq, &rdev->sched_scan_res_wk);
642 EXPORT_SYMBOL(cfg80211_sched_scan_results);
644 void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy, u64 reqid)
646 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
650 trace_cfg80211_sched_scan_stopped(wiphy, reqid);
652 __cfg80211_stop_sched_scan(rdev, reqid, true);
654 EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl);
656 void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid)
659 cfg80211_sched_scan_stopped_rtnl(wiphy, reqid);
662 EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
664 int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev,
665 struct cfg80211_sched_scan_request *req,
666 bool driver_initiated)
670 if (!driver_initiated) {
671 int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid);
676 nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED);
678 cfg80211_del_sched_scan_req(rdev, req);
683 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
684 u64 reqid, bool driver_initiated)
686 struct cfg80211_sched_scan_request *sched_scan_req;
690 sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid);
694 return cfg80211_stop_sched_scan_req(rdev, sched_scan_req,
698 void cfg80211_bss_age(struct cfg80211_registered_device *rdev,
699 unsigned long age_secs)
701 struct cfg80211_internal_bss *bss;
702 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
704 spin_lock_bh(&rdev->bss_lock);
705 list_for_each_entry(bss, &rdev->bss_list, list)
706 bss->ts -= age_jiffies;
707 spin_unlock_bh(&rdev->bss_lock);
710 void cfg80211_bss_expire(struct cfg80211_registered_device *rdev)
712 __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
715 void cfg80211_bss_flush(struct wiphy *wiphy)
717 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
719 spin_lock_bh(&rdev->bss_lock);
720 __cfg80211_bss_expire(rdev, jiffies);
721 spin_unlock_bh(&rdev->bss_lock);
723 EXPORT_SYMBOL(cfg80211_bss_flush);
725 const struct element *
726 cfg80211_find_elem_match(u8 eid, const u8 *ies, unsigned int len,
727 const u8 *match, unsigned int match_len,
728 unsigned int match_offset)
730 const struct element *elem;
732 for_each_element_id(elem, eid, ies, len) {
733 if (elem->datalen >= match_offset + match_len &&
734 !memcmp(elem->data + match_offset, match, match_len))
740 EXPORT_SYMBOL(cfg80211_find_elem_match);
742 const struct element *cfg80211_find_vendor_elem(unsigned int oui, int oui_type,
746 const struct element *elem;
747 u8 match[] = { oui >> 16, oui >> 8, oui, oui_type };
748 int match_len = (oui_type < 0) ? 3 : sizeof(match);
750 if (WARN_ON(oui_type > 0xff))
753 elem = cfg80211_find_elem_match(WLAN_EID_VENDOR_SPECIFIC, ies, len,
754 match, match_len, 0);
756 if (!elem || elem->datalen < 4)
761 EXPORT_SYMBOL(cfg80211_find_vendor_elem);
764 * enum bss_compare_mode - BSS compare mode
765 * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
766 * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
767 * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
769 enum bss_compare_mode {
775 static int cmp_bss(struct cfg80211_bss *a,
776 struct cfg80211_bss *b,
777 enum bss_compare_mode mode)
779 const struct cfg80211_bss_ies *a_ies, *b_ies;
780 const u8 *ie1 = NULL;
781 const u8 *ie2 = NULL;
784 if (a->channel != b->channel)
785 return b->channel->center_freq - a->channel->center_freq;
787 a_ies = rcu_access_pointer(a->ies);
790 b_ies = rcu_access_pointer(b->ies);
794 if (WLAN_CAPABILITY_IS_STA_BSS(a->capability))
795 ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID,
796 a_ies->data, a_ies->len);
797 if (WLAN_CAPABILITY_IS_STA_BSS(b->capability))
798 ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID,
799 b_ies->data, b_ies->len);
803 if (ie1[1] == ie2[1])
804 mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]);
806 mesh_id_cmp = ie2[1] - ie1[1];
808 ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
809 a_ies->data, a_ies->len);
810 ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
811 b_ies->data, b_ies->len);
815 if (ie1[1] != ie2[1])
816 return ie2[1] - ie1[1];
817 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
821 r = memcmp(a->bssid, b->bssid, sizeof(a->bssid));
825 ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
826 ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
832 * Note that with "hide_ssid", the function returns a match if
833 * the already-present BSS ("b") is a hidden SSID beacon for
837 /* sort missing IE before (left of) present IE */
844 case BSS_CMP_HIDE_ZLEN:
846 * In ZLEN mode we assume the BSS entry we're
847 * looking for has a zero-length SSID. So if
848 * the one we're looking at right now has that,
849 * return 0. Otherwise, return the difference
850 * in length, but since we're looking for the
851 * 0-length it's really equivalent to returning
852 * the length of the one we're looking at.
854 * No content comparison is needed as we assume
855 * the content length is zero.
858 case BSS_CMP_REGULAR:
860 /* sort by length first, then by contents */
861 if (ie1[1] != ie2[1])
862 return ie2[1] - ie1[1];
863 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
864 case BSS_CMP_HIDE_NUL:
865 if (ie1[1] != ie2[1])
866 return ie2[1] - ie1[1];
867 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */
868 for (i = 0; i < ie2[1]; i++)
875 static bool cfg80211_bss_type_match(u16 capability,
876 enum nl80211_band band,
877 enum ieee80211_bss_type bss_type)
882 if (bss_type == IEEE80211_BSS_TYPE_ANY)
885 if (band == NL80211_BAND_60GHZ) {
886 mask = WLAN_CAPABILITY_DMG_TYPE_MASK;
888 case IEEE80211_BSS_TYPE_ESS:
889 val = WLAN_CAPABILITY_DMG_TYPE_AP;
891 case IEEE80211_BSS_TYPE_PBSS:
892 val = WLAN_CAPABILITY_DMG_TYPE_PBSS;
894 case IEEE80211_BSS_TYPE_IBSS:
895 val = WLAN_CAPABILITY_DMG_TYPE_IBSS;
901 mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS;
903 case IEEE80211_BSS_TYPE_ESS:
904 val = WLAN_CAPABILITY_ESS;
906 case IEEE80211_BSS_TYPE_IBSS:
907 val = WLAN_CAPABILITY_IBSS;
909 case IEEE80211_BSS_TYPE_MBSS:
917 ret = ((capability & mask) == val);
921 /* Returned bss is reference counted and must be cleaned up appropriately. */
922 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
923 struct ieee80211_channel *channel,
925 const u8 *ssid, size_t ssid_len,
926 enum ieee80211_bss_type bss_type,
927 enum ieee80211_privacy privacy)
929 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
930 struct cfg80211_internal_bss *bss, *res = NULL;
931 unsigned long now = jiffies;
934 trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type,
937 spin_lock_bh(&rdev->bss_lock);
939 list_for_each_entry(bss, &rdev->bss_list, list) {
940 if (!cfg80211_bss_type_match(bss->pub.capability,
941 bss->pub.channel->band, bss_type))
944 bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY);
945 if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) ||
946 (privacy == IEEE80211_PRIVACY_OFF && bss_privacy))
948 if (channel && bss->pub.channel != channel)
950 if (!is_valid_ether_addr(bss->pub.bssid))
952 /* Don't get expired BSS structs */
953 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
954 !atomic_read(&bss->hold))
956 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
958 bss_ref_get(rdev, res);
963 spin_unlock_bh(&rdev->bss_lock);
966 trace_cfg80211_return_bss(&res->pub);
969 EXPORT_SYMBOL(cfg80211_get_bss);
971 static void rb_insert_bss(struct cfg80211_registered_device *rdev,
972 struct cfg80211_internal_bss *bss)
974 struct rb_node **p = &rdev->bss_tree.rb_node;
975 struct rb_node *parent = NULL;
976 struct cfg80211_internal_bss *tbss;
981 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
983 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR);
986 /* will sort of leak this BSS */
996 rb_link_node(&bss->rbn, parent, p);
997 rb_insert_color(&bss->rbn, &rdev->bss_tree);
1000 static struct cfg80211_internal_bss *
1001 rb_find_bss(struct cfg80211_registered_device *rdev,
1002 struct cfg80211_internal_bss *res,
1003 enum bss_compare_mode mode)
1005 struct rb_node *n = rdev->bss_tree.rb_node;
1006 struct cfg80211_internal_bss *bss;
1010 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
1011 r = cmp_bss(&res->pub, &bss->pub, mode);
1024 static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev,
1025 struct cfg80211_internal_bss *new)
1027 const struct cfg80211_bss_ies *ies;
1028 struct cfg80211_internal_bss *bss;
1034 ies = rcu_access_pointer(new->pub.beacon_ies);
1038 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
1045 for (i = 0; i < ssidlen; i++)
1049 /* not a hidden SSID */
1053 /* This is the bad part ... */
1055 list_for_each_entry(bss, &rdev->bss_list, list) {
1057 * we're iterating all the entries anyway, so take the
1058 * opportunity to validate the list length accounting
1062 if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid))
1064 if (bss->pub.channel != new->pub.channel)
1066 if (bss->pub.scan_width != new->pub.scan_width)
1068 if (rcu_access_pointer(bss->pub.beacon_ies))
1070 ies = rcu_access_pointer(bss->pub.ies);
1073 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
1076 if (ssidlen && ie[1] != ssidlen)
1078 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss))
1080 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list)))
1081 list_del(&bss->hidden_list);
1083 list_add(&bss->hidden_list, &new->hidden_list);
1084 bss->pub.hidden_beacon_bss = &new->pub;
1085 new->refcount += bss->refcount;
1086 rcu_assign_pointer(bss->pub.beacon_ies,
1087 new->pub.beacon_ies);
1090 WARN_ONCE(n_entries != rdev->bss_entries,
1091 "rdev bss entries[%d]/list[len:%d] corruption\n",
1092 rdev->bss_entries, n_entries);
1097 struct cfg80211_non_tx_bss {
1098 struct cfg80211_bss *tx_bss;
1099 u8 max_bssid_indicator;
1104 cfg80211_update_known_bss(struct cfg80211_registered_device *rdev,
1105 struct cfg80211_internal_bss *known,
1106 struct cfg80211_internal_bss *new,
1109 lockdep_assert_held(&rdev->bss_lock);
1112 if (rcu_access_pointer(new->pub.proberesp_ies)) {
1113 const struct cfg80211_bss_ies *old;
1115 old = rcu_access_pointer(known->pub.proberesp_ies);
1117 rcu_assign_pointer(known->pub.proberesp_ies,
1118 new->pub.proberesp_ies);
1119 /* Override possible earlier Beacon frame IEs */
1120 rcu_assign_pointer(known->pub.ies,
1121 new->pub.proberesp_ies);
1123 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1124 } else if (rcu_access_pointer(new->pub.beacon_ies)) {
1125 const struct cfg80211_bss_ies *old;
1126 struct cfg80211_internal_bss *bss;
1128 if (known->pub.hidden_beacon_bss &&
1129 !list_empty(&known->hidden_list)) {
1130 const struct cfg80211_bss_ies *f;
1132 /* The known BSS struct is one of the probe
1133 * response members of a group, but we're
1134 * receiving a beacon (beacon_ies in the new
1135 * bss is used). This can only mean that the
1136 * AP changed its beacon from not having an
1137 * SSID to showing it, which is confusing so
1138 * drop this information.
1141 f = rcu_access_pointer(new->pub.beacon_ies);
1142 kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head);
1146 old = rcu_access_pointer(known->pub.beacon_ies);
1148 rcu_assign_pointer(known->pub.beacon_ies, new->pub.beacon_ies);
1150 /* Override IEs if they were from a beacon before */
1151 if (old == rcu_access_pointer(known->pub.ies))
1152 rcu_assign_pointer(known->pub.ies, new->pub.beacon_ies);
1154 /* Assign beacon IEs to all sub entries */
1155 list_for_each_entry(bss, &known->hidden_list, hidden_list) {
1156 const struct cfg80211_bss_ies *ies;
1158 ies = rcu_access_pointer(bss->pub.beacon_ies);
1159 WARN_ON(ies != old);
1161 rcu_assign_pointer(bss->pub.beacon_ies,
1162 new->pub.beacon_ies);
1166 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1169 known->pub.beacon_interval = new->pub.beacon_interval;
1171 /* don't update the signal if beacon was heard on
1175 known->pub.signal = new->pub.signal;
1176 known->pub.capability = new->pub.capability;
1177 known->ts = new->ts;
1178 known->ts_boottime = new->ts_boottime;
1179 known->parent_tsf = new->parent_tsf;
1180 known->pub.chains = new->pub.chains;
1181 memcpy(known->pub.chain_signal, new->pub.chain_signal,
1182 IEEE80211_MAX_CHAINS);
1183 ether_addr_copy(known->parent_bssid, new->parent_bssid);
1184 known->pub.max_bssid_indicator = new->pub.max_bssid_indicator;
1185 known->pub.bssid_index = new->pub.bssid_index;
1190 /* Returned bss is reference counted and must be cleaned up appropriately. */
1191 struct cfg80211_internal_bss *
1192 cfg80211_bss_update(struct cfg80211_registered_device *rdev,
1193 struct cfg80211_internal_bss *tmp,
1194 bool signal_valid, unsigned long ts)
1196 struct cfg80211_internal_bss *found = NULL;
1198 if (WARN_ON(!tmp->pub.channel))
1203 spin_lock_bh(&rdev->bss_lock);
1205 if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
1206 spin_unlock_bh(&rdev->bss_lock);
1210 found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR);
1213 if (!cfg80211_update_known_bss(rdev, found, tmp, signal_valid))
1216 struct cfg80211_internal_bss *new;
1217 struct cfg80211_internal_bss *hidden;
1218 struct cfg80211_bss_ies *ies;
1221 * create a copy -- the "res" variable that is passed in
1222 * is allocated on the stack since it's not needed in the
1223 * more common case of an update
1225 new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size,
1228 ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
1230 kfree_rcu(ies, rcu_head);
1231 ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
1233 kfree_rcu(ies, rcu_head);
1236 memcpy(new, tmp, sizeof(*new));
1238 INIT_LIST_HEAD(&new->hidden_list);
1239 INIT_LIST_HEAD(&new->pub.nontrans_list);
1241 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
1242 hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
1244 hidden = rb_find_bss(rdev, tmp,
1247 new->pub.hidden_beacon_bss = &hidden->pub;
1248 list_add(&new->hidden_list,
1249 &hidden->hidden_list);
1251 rcu_assign_pointer(new->pub.beacon_ies,
1252 hidden->pub.beacon_ies);
1256 * Ok so we found a beacon, and don't have an entry. If
1257 * it's a beacon with hidden SSID, we might be in for an
1258 * expensive search for any probe responses that should
1259 * be grouped with this beacon for updates ...
1261 if (!cfg80211_combine_bsses(rdev, new)) {
1267 if (rdev->bss_entries >= bss_entries_limit &&
1268 !cfg80211_bss_expire_oldest(rdev)) {
1273 /* This must be before the call to bss_ref_get */
1274 if (tmp->pub.transmitted_bss) {
1275 struct cfg80211_internal_bss *pbss =
1276 container_of(tmp->pub.transmitted_bss,
1277 struct cfg80211_internal_bss,
1280 new->pub.transmitted_bss = tmp->pub.transmitted_bss;
1281 bss_ref_get(rdev, pbss);
1284 list_add_tail(&new->list, &rdev->bss_list);
1285 rdev->bss_entries++;
1286 rb_insert_bss(rdev, new);
1290 rdev->bss_generation++;
1291 bss_ref_get(rdev, found);
1292 spin_unlock_bh(&rdev->bss_lock);
1296 spin_unlock_bh(&rdev->bss_lock);
1301 * Update RX channel information based on the available frame payload
1302 * information. This is mainly for the 2.4 GHz band where frames can be received
1303 * from neighboring channels and the Beacon frames use the DSSS Parameter Set
1304 * element to indicate the current (transmitting) channel, but this might also
1305 * be needed on other bands if RX frequency does not match with the actual
1306 * operating channel of a BSS.
1308 static struct ieee80211_channel *
1309 cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
1310 struct ieee80211_channel *channel,
1311 enum nl80211_bss_scan_width scan_width)
1315 int channel_number = -1;
1316 struct ieee80211_channel *alt_channel;
1318 tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen);
1319 if (tmp && tmp[1] == 1) {
1320 channel_number = tmp[2];
1322 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen);
1323 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) {
1324 struct ieee80211_ht_operation *htop = (void *)(tmp + 2);
1326 channel_number = htop->primary_chan;
1330 if (channel_number < 0) {
1331 /* No channel information in frame payload */
1335 freq = ieee80211_channel_to_freq_khz(channel_number, channel->band);
1336 alt_channel = ieee80211_get_channel_khz(wiphy, freq);
1338 if (channel->band == NL80211_BAND_2GHZ) {
1340 * Better not allow unexpected channels when that could
1341 * be going beyond the 1-11 range (e.g., discovering
1342 * BSS on channel 12 when radio is configured for
1348 /* No match for the payload channel number - ignore it */
1352 if (scan_width == NL80211_BSS_CHAN_WIDTH_10 ||
1353 scan_width == NL80211_BSS_CHAN_WIDTH_5) {
1355 * Ignore channel number in 5 and 10 MHz channels where there
1356 * may not be an n:1 or 1:n mapping between frequencies and
1363 * Use the channel determined through the payload channel number
1364 * instead of the RX channel reported by the driver.
1366 if (alt_channel->flags & IEEE80211_CHAN_DISABLED)
1371 /* Returned bss is reference counted and must be cleaned up appropriately. */
1372 static struct cfg80211_bss *
1373 cfg80211_inform_single_bss_data(struct wiphy *wiphy,
1374 struct cfg80211_inform_bss *data,
1375 enum cfg80211_bss_frame_type ftype,
1376 const u8 *bssid, u64 tsf, u16 capability,
1377 u16 beacon_interval, const u8 *ie, size_t ielen,
1378 struct cfg80211_non_tx_bss *non_tx_data,
1381 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1382 struct cfg80211_bss_ies *ies;
1383 struct ieee80211_channel *channel;
1384 struct cfg80211_internal_bss tmp = {}, *res;
1389 if (WARN_ON(!wiphy))
1392 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
1393 (data->signal < 0 || data->signal > 100)))
1396 channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan,
1401 memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
1402 tmp.pub.channel = channel;
1403 tmp.pub.scan_width = data->scan_width;
1404 tmp.pub.signal = data->signal;
1405 tmp.pub.beacon_interval = beacon_interval;
1406 tmp.pub.capability = capability;
1407 tmp.ts_boottime = data->boottime_ns;
1409 tmp.pub.transmitted_bss = non_tx_data->tx_bss;
1410 ts = bss_from_pub(non_tx_data->tx_bss)->ts;
1411 tmp.pub.bssid_index = non_tx_data->bssid_index;
1412 tmp.pub.max_bssid_indicator = non_tx_data->max_bssid_indicator;
1418 * If we do not know here whether the IEs are from a Beacon or Probe
1419 * Response frame, we need to pick one of the options and only use it
1420 * with the driver that does not provide the full Beacon/Probe Response
1421 * frame. Use Beacon frame pointer to avoid indicating that this should
1422 * override the IEs pointer should we have received an earlier
1423 * indication of Probe Response data.
1425 ies = kzalloc(sizeof(*ies) + ielen, gfp);
1430 ies->from_beacon = false;
1431 memcpy(ies->data, ie, ielen);
1434 case CFG80211_BSS_FTYPE_BEACON:
1435 ies->from_beacon = true;
1437 case CFG80211_BSS_FTYPE_UNKNOWN:
1438 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1440 case CFG80211_BSS_FTYPE_PRESP:
1441 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1444 rcu_assign_pointer(tmp.pub.ies, ies);
1446 signal_valid = data->chan == channel;
1447 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid, ts);
1451 if (channel->band == NL80211_BAND_60GHZ) {
1452 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1453 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1454 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1455 regulatory_hint_found_beacon(wiphy, channel, gfp);
1457 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1458 regulatory_hint_found_beacon(wiphy, channel, gfp);
1462 /* this is a nontransmitting bss, we need to add it to
1463 * transmitting bss' list if it is not there
1465 if (cfg80211_add_nontrans_list(non_tx_data->tx_bss,
1467 if (__cfg80211_unlink_bss(rdev, res))
1468 rdev->bss_generation++;
1472 trace_cfg80211_return_bss(&res->pub);
1473 /* cfg80211_bss_update gives us a referenced result */
1477 static const struct element
1478 *cfg80211_get_profile_continuation(const u8 *ie, size_t ielen,
1479 const struct element *mbssid_elem,
1480 const struct element *sub_elem)
1482 const u8 *mbssid_end = mbssid_elem->data + mbssid_elem->datalen;
1483 const struct element *next_mbssid;
1484 const struct element *next_sub;
1486 next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID,
1488 ielen - (mbssid_end - ie));
1491 * If is is not the last subelement in current MBSSID IE or there isn't
1492 * a next MBSSID IE - profile is complete.
1494 if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) ||
1498 /* For any length error, just return NULL */
1500 if (next_mbssid->datalen < 4)
1503 next_sub = (void *)&next_mbssid->data[1];
1505 if (next_mbssid->data + next_mbssid->datalen <
1506 next_sub->data + next_sub->datalen)
1509 if (next_sub->id != 0 || next_sub->datalen < 2)
1513 * Check if the first element in the next sub element is a start
1516 return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ?
1520 size_t cfg80211_merge_profile(const u8 *ie, size_t ielen,
1521 const struct element *mbssid_elem,
1522 const struct element *sub_elem,
1523 u8 *merged_ie, size_t max_copy_len)
1525 size_t copied_len = sub_elem->datalen;
1526 const struct element *next_mbssid;
1528 if (sub_elem->datalen > max_copy_len)
1531 memcpy(merged_ie, sub_elem->data, sub_elem->datalen);
1533 while ((next_mbssid = cfg80211_get_profile_continuation(ie, ielen,
1536 const struct element *next_sub = (void *)&next_mbssid->data[1];
1538 if (copied_len + next_sub->datalen > max_copy_len)
1540 memcpy(merged_ie + copied_len, next_sub->data,
1542 copied_len += next_sub->datalen;
1547 EXPORT_SYMBOL(cfg80211_merge_profile);
1549 static void cfg80211_parse_mbssid_data(struct wiphy *wiphy,
1550 struct cfg80211_inform_bss *data,
1551 enum cfg80211_bss_frame_type ftype,
1552 const u8 *bssid, u64 tsf,
1553 u16 beacon_interval, const u8 *ie,
1555 struct cfg80211_non_tx_bss *non_tx_data,
1558 const u8 *mbssid_index_ie;
1559 const struct element *elem, *sub;
1561 u8 new_bssid[ETH_ALEN];
1562 u8 *new_ie, *profile;
1563 u64 seen_indices = 0;
1565 struct cfg80211_bss *bss;
1569 if (!cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
1571 if (!wiphy->support_mbssid)
1573 if (wiphy->support_only_he_mbssid &&
1574 !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
1577 new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp);
1581 profile = kmalloc(ielen, gfp);
1585 for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, ie, ielen) {
1586 if (elem->datalen < 4)
1588 for_each_element(sub, elem->data + 1, elem->datalen - 1) {
1591 if (sub->id != 0 || sub->datalen < 4) {
1592 /* not a valid BSS profile */
1596 if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP ||
1597 sub->data[1] != 2) {
1598 /* The first element within the Nontransmitted
1599 * BSSID Profile is not the Nontransmitted
1600 * BSSID Capability element.
1605 memset(profile, 0, ielen);
1606 profile_len = cfg80211_merge_profile(ie, ielen,
1612 /* found a Nontransmitted BSSID Profile */
1613 mbssid_index_ie = cfg80211_find_ie
1614 (WLAN_EID_MULTI_BSSID_IDX,
1615 profile, profile_len);
1616 if (!mbssid_index_ie || mbssid_index_ie[1] < 1 ||
1617 mbssid_index_ie[2] == 0 ||
1618 mbssid_index_ie[2] > 46) {
1619 /* No valid Multiple BSSID-Index element */
1623 if (seen_indices & BIT_ULL(mbssid_index_ie[2]))
1624 /* We don't support legacy split of a profile */
1625 net_dbg_ratelimited("Partial info for BSSID index %d\n",
1626 mbssid_index_ie[2]);
1628 seen_indices |= BIT_ULL(mbssid_index_ie[2]);
1630 non_tx_data->bssid_index = mbssid_index_ie[2];
1631 non_tx_data->max_bssid_indicator = elem->data[0];
1633 cfg80211_gen_new_bssid(bssid,
1634 non_tx_data->max_bssid_indicator,
1635 non_tx_data->bssid_index,
1637 memset(new_ie, 0, IEEE80211_MAX_DATA_LEN);
1638 new_ie_len = cfg80211_gen_new_ie(ie, ielen,
1640 profile_len, new_ie,
1645 capability = get_unaligned_le16(profile + 2);
1646 bss = cfg80211_inform_single_bss_data(wiphy, data,
1657 cfg80211_put_bss(wiphy, bss);
1666 struct cfg80211_bss *
1667 cfg80211_inform_bss_data(struct wiphy *wiphy,
1668 struct cfg80211_inform_bss *data,
1669 enum cfg80211_bss_frame_type ftype,
1670 const u8 *bssid, u64 tsf, u16 capability,
1671 u16 beacon_interval, const u8 *ie, size_t ielen,
1674 struct cfg80211_bss *res;
1675 struct cfg80211_non_tx_bss non_tx_data;
1677 res = cfg80211_inform_single_bss_data(wiphy, data, ftype, bssid, tsf,
1678 capability, beacon_interval, ie,
1682 non_tx_data.tx_bss = res;
1683 cfg80211_parse_mbssid_data(wiphy, data, ftype, bssid, tsf,
1684 beacon_interval, ie, ielen, &non_tx_data,
1688 EXPORT_SYMBOL(cfg80211_inform_bss_data);
1691 cfg80211_parse_mbssid_frame_data(struct wiphy *wiphy,
1692 struct cfg80211_inform_bss *data,
1693 struct ieee80211_mgmt *mgmt, size_t len,
1694 struct cfg80211_non_tx_bss *non_tx_data,
1697 enum cfg80211_bss_frame_type ftype;
1698 const u8 *ie = mgmt->u.probe_resp.variable;
1699 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1700 u.probe_resp.variable);
1702 ftype = ieee80211_is_beacon(mgmt->frame_control) ?
1703 CFG80211_BSS_FTYPE_BEACON : CFG80211_BSS_FTYPE_PRESP;
1705 cfg80211_parse_mbssid_data(wiphy, data, ftype, mgmt->bssid,
1706 le64_to_cpu(mgmt->u.probe_resp.timestamp),
1707 le16_to_cpu(mgmt->u.probe_resp.beacon_int),
1708 ie, ielen, non_tx_data, gfp);
1712 cfg80211_update_notlisted_nontrans(struct wiphy *wiphy,
1713 struct cfg80211_bss *nontrans_bss,
1714 struct ieee80211_mgmt *mgmt, size_t len)
1716 u8 *ie, *new_ie, *pos;
1717 const u8 *nontrans_ssid, *trans_ssid, *mbssid;
1718 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1719 u.probe_resp.variable);
1721 struct cfg80211_bss_ies *new_ies;
1722 const struct cfg80211_bss_ies *old;
1725 lockdep_assert_held(&wiphy_to_rdev(wiphy)->bss_lock);
1727 ie = mgmt->u.probe_resp.variable;
1730 trans_ssid = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
1733 new_ie_len -= trans_ssid[1];
1734 mbssid = cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen);
1736 * It's not valid to have the MBSSID element before SSID
1737 * ignore if that happens - the code below assumes it is
1738 * after (while copying things inbetween).
1740 if (!mbssid || mbssid < trans_ssid)
1742 new_ie_len -= mbssid[1];
1744 nontrans_ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
1748 new_ie_len += nontrans_ssid[1];
1750 /* generate new ie for nontrans BSS
1751 * 1. replace SSID with nontrans BSS' SSID
1754 new_ie = kzalloc(new_ie_len, GFP_ATOMIC);
1758 new_ies = kzalloc(sizeof(*new_ies) + new_ie_len, GFP_ATOMIC);
1764 /* copy the nontransmitted SSID */
1765 cpy_len = nontrans_ssid[1] + 2;
1766 memcpy(pos, nontrans_ssid, cpy_len);
1768 /* copy the IEs between SSID and MBSSID */
1769 cpy_len = trans_ssid[1] + 2;
1770 memcpy(pos, (trans_ssid + cpy_len), (mbssid - (trans_ssid + cpy_len)));
1771 pos += (mbssid - (trans_ssid + cpy_len));
1772 /* copy the IEs after MBSSID */
1773 cpy_len = mbssid[1] + 2;
1774 memcpy(pos, mbssid + cpy_len, ((ie + ielen) - (mbssid + cpy_len)));
1777 new_ies->len = new_ie_len;
1778 new_ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
1779 new_ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
1780 memcpy(new_ies->data, new_ie, new_ie_len);
1781 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
1782 old = rcu_access_pointer(nontrans_bss->proberesp_ies);
1783 rcu_assign_pointer(nontrans_bss->proberesp_ies, new_ies);
1784 rcu_assign_pointer(nontrans_bss->ies, new_ies);
1786 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1788 old = rcu_access_pointer(nontrans_bss->beacon_ies);
1789 rcu_assign_pointer(nontrans_bss->beacon_ies, new_ies);
1790 rcu_assign_pointer(nontrans_bss->ies, new_ies);
1792 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1799 /* cfg80211_inform_bss_width_frame helper */
1800 static struct cfg80211_bss *
1801 cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
1802 struct cfg80211_inform_bss *data,
1803 struct ieee80211_mgmt *mgmt, size_t len,
1806 struct cfg80211_internal_bss tmp = {}, *res;
1807 struct cfg80211_bss_ies *ies;
1808 struct ieee80211_channel *channel;
1810 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1811 u.probe_resp.variable);
1814 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
1815 offsetof(struct ieee80211_mgmt, u.beacon.variable));
1817 trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len);
1822 if (WARN_ON(!wiphy))
1825 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
1826 (data->signal < 0 || data->signal > 100)))
1829 if (WARN_ON(len < offsetof(struct ieee80211_mgmt, u.probe_resp.variable)))
1832 channel = cfg80211_get_bss_channel(wiphy, mgmt->u.beacon.variable,
1833 ielen, data->chan, data->scan_width);
1837 ies = kzalloc(sizeof(*ies) + ielen, gfp);
1841 ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
1842 ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
1843 memcpy(ies->data, mgmt->u.probe_resp.variable, ielen);
1845 if (ieee80211_is_probe_resp(mgmt->frame_control))
1846 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1848 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1849 rcu_assign_pointer(tmp.pub.ies, ies);
1851 memcpy(tmp.pub.bssid, mgmt->bssid, ETH_ALEN);
1852 tmp.pub.channel = channel;
1853 tmp.pub.scan_width = data->scan_width;
1854 tmp.pub.signal = data->signal;
1855 tmp.pub.beacon_interval = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
1856 tmp.pub.capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
1857 tmp.ts_boottime = data->boottime_ns;
1858 tmp.parent_tsf = data->parent_tsf;
1859 tmp.pub.chains = data->chains;
1860 memcpy(tmp.pub.chain_signal, data->chain_signal, IEEE80211_MAX_CHAINS);
1861 ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
1863 signal_valid = data->chan == channel;
1864 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid,
1869 if (channel->band == NL80211_BAND_60GHZ) {
1870 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1871 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1872 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1873 regulatory_hint_found_beacon(wiphy, channel, gfp);
1875 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1876 regulatory_hint_found_beacon(wiphy, channel, gfp);
1879 trace_cfg80211_return_bss(&res->pub);
1880 /* cfg80211_bss_update gives us a referenced result */
1884 struct cfg80211_bss *
1885 cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
1886 struct cfg80211_inform_bss *data,
1887 struct ieee80211_mgmt *mgmt, size_t len,
1890 struct cfg80211_bss *res, *tmp_bss;
1891 const u8 *ie = mgmt->u.probe_resp.variable;
1892 const struct cfg80211_bss_ies *ies1, *ies2;
1893 size_t ielen = len - offsetof(struct ieee80211_mgmt,
1894 u.probe_resp.variable);
1895 struct cfg80211_non_tx_bss non_tx_data;
1897 res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt,
1899 if (!res || !wiphy->support_mbssid ||
1900 !cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
1902 if (wiphy->support_only_he_mbssid &&
1903 !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
1906 non_tx_data.tx_bss = res;
1907 /* process each non-transmitting bss */
1908 cfg80211_parse_mbssid_frame_data(wiphy, data, mgmt, len,
1911 spin_lock_bh(&wiphy_to_rdev(wiphy)->bss_lock);
1913 /* check if the res has other nontransmitting bss which is not
1916 ies1 = rcu_access_pointer(res->ies);
1918 /* go through nontrans_list, if the timestamp of the BSS is
1919 * earlier than the timestamp of the transmitting BSS then
1922 list_for_each_entry(tmp_bss, &res->nontrans_list,
1924 ies2 = rcu_access_pointer(tmp_bss->ies);
1925 if (ies2->tsf < ies1->tsf)
1926 cfg80211_update_notlisted_nontrans(wiphy, tmp_bss,
1929 spin_unlock_bh(&wiphy_to_rdev(wiphy)->bss_lock);
1933 EXPORT_SYMBOL(cfg80211_inform_bss_frame_data);
1935 void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1937 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1938 struct cfg80211_internal_bss *bss;
1943 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1945 spin_lock_bh(&rdev->bss_lock);
1946 bss_ref_get(rdev, bss);
1947 spin_unlock_bh(&rdev->bss_lock);
1949 EXPORT_SYMBOL(cfg80211_ref_bss);
1951 void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1953 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1954 struct cfg80211_internal_bss *bss;
1959 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1961 spin_lock_bh(&rdev->bss_lock);
1962 bss_ref_put(rdev, bss);
1963 spin_unlock_bh(&rdev->bss_lock);
1965 EXPORT_SYMBOL(cfg80211_put_bss);
1967 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
1969 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1970 struct cfg80211_internal_bss *bss, *tmp1;
1971 struct cfg80211_bss *nontrans_bss, *tmp;
1976 bss = container_of(pub, struct cfg80211_internal_bss, pub);
1978 spin_lock_bh(&rdev->bss_lock);
1979 if (list_empty(&bss->list))
1982 list_for_each_entry_safe(nontrans_bss, tmp,
1983 &pub->nontrans_list,
1985 tmp1 = container_of(nontrans_bss,
1986 struct cfg80211_internal_bss, pub);
1987 if (__cfg80211_unlink_bss(rdev, tmp1))
1988 rdev->bss_generation++;
1991 if (__cfg80211_unlink_bss(rdev, bss))
1992 rdev->bss_generation++;
1994 spin_unlock_bh(&rdev->bss_lock);
1996 EXPORT_SYMBOL(cfg80211_unlink_bss);
1998 void cfg80211_bss_iter(struct wiphy *wiphy,
1999 struct cfg80211_chan_def *chandef,
2000 void (*iter)(struct wiphy *wiphy,
2001 struct cfg80211_bss *bss,
2005 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2006 struct cfg80211_internal_bss *bss;
2008 spin_lock_bh(&rdev->bss_lock);
2010 list_for_each_entry(bss, &rdev->bss_list, list) {
2011 if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel))
2012 iter(wiphy, &bss->pub, iter_data);
2015 spin_unlock_bh(&rdev->bss_lock);
2017 EXPORT_SYMBOL(cfg80211_bss_iter);
2019 void cfg80211_update_assoc_bss_entry(struct wireless_dev *wdev,
2020 struct ieee80211_channel *chan)
2022 struct wiphy *wiphy = wdev->wiphy;
2023 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2024 struct cfg80211_internal_bss *cbss = wdev->current_bss;
2025 struct cfg80211_internal_bss *new = NULL;
2026 struct cfg80211_internal_bss *bss;
2027 struct cfg80211_bss *nontrans_bss;
2028 struct cfg80211_bss *tmp;
2030 spin_lock_bh(&rdev->bss_lock);
2033 * Some APs use CSA also for bandwidth changes, i.e., without actually
2034 * changing the control channel, so no need to update in such a case.
2036 if (cbss->pub.channel == chan)
2039 /* use transmitting bss */
2040 if (cbss->pub.transmitted_bss)
2041 cbss = container_of(cbss->pub.transmitted_bss,
2042 struct cfg80211_internal_bss,
2045 cbss->pub.channel = chan;
2047 list_for_each_entry(bss, &rdev->bss_list, list) {
2048 if (!cfg80211_bss_type_match(bss->pub.capability,
2049 bss->pub.channel->band,
2050 wdev->conn_bss_type))
2056 if (!cmp_bss(&bss->pub, &cbss->pub, BSS_CMP_REGULAR)) {
2063 /* to save time, update IEs for transmitting bss only */
2064 if (cfg80211_update_known_bss(rdev, cbss, new, false)) {
2065 new->pub.proberesp_ies = NULL;
2066 new->pub.beacon_ies = NULL;
2069 list_for_each_entry_safe(nontrans_bss, tmp,
2070 &new->pub.nontrans_list,
2072 bss = container_of(nontrans_bss,
2073 struct cfg80211_internal_bss, pub);
2074 if (__cfg80211_unlink_bss(rdev, bss))
2075 rdev->bss_generation++;
2078 WARN_ON(atomic_read(&new->hold));
2079 if (!WARN_ON(!__cfg80211_unlink_bss(rdev, new)))
2080 rdev->bss_generation++;
2083 rb_erase(&cbss->rbn, &rdev->bss_tree);
2084 rb_insert_bss(rdev, cbss);
2085 rdev->bss_generation++;
2087 list_for_each_entry_safe(nontrans_bss, tmp,
2088 &cbss->pub.nontrans_list,
2090 bss = container_of(nontrans_bss,
2091 struct cfg80211_internal_bss, pub);
2092 bss->pub.channel = chan;
2093 rb_erase(&bss->rbn, &rdev->bss_tree);
2094 rb_insert_bss(rdev, bss);
2095 rdev->bss_generation++;
2099 spin_unlock_bh(&rdev->bss_lock);
2102 #ifdef CONFIG_CFG80211_WEXT
2103 static struct cfg80211_registered_device *
2104 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
2106 struct cfg80211_registered_device *rdev;
2107 struct net_device *dev;
2111 dev = dev_get_by_index(net, ifindex);
2113 return ERR_PTR(-ENODEV);
2114 if (dev->ieee80211_ptr)
2115 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
2117 rdev = ERR_PTR(-ENODEV);
2122 int cfg80211_wext_siwscan(struct net_device *dev,
2123 struct iw_request_info *info,
2124 union iwreq_data *wrqu, char *extra)
2126 struct cfg80211_registered_device *rdev;
2127 struct wiphy *wiphy;
2128 struct iw_scan_req *wreq = NULL;
2129 struct cfg80211_scan_request *creq = NULL;
2130 int i, err, n_channels = 0;
2131 enum nl80211_band band;
2133 if (!netif_running(dev))
2136 if (wrqu->data.length == sizeof(struct iw_scan_req))
2137 wreq = (struct iw_scan_req *)extra;
2139 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2142 return PTR_ERR(rdev);
2144 if (rdev->scan_req || rdev->scan_msg) {
2149 wiphy = &rdev->wiphy;
2151 /* Determine number of channels, needed to allocate creq */
2152 if (wreq && wreq->num_channels)
2153 n_channels = wreq->num_channels;
2155 n_channels = ieee80211_get_num_supported_channels(wiphy);
2157 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
2158 n_channels * sizeof(void *),
2165 creq->wiphy = wiphy;
2166 creq->wdev = dev->ieee80211_ptr;
2167 /* SSIDs come after channels */
2168 creq->ssids = (void *)&creq->channels[n_channels];
2169 creq->n_channels = n_channels;
2171 creq->scan_start = jiffies;
2173 /* translate "Scan on frequencies" request */
2175 for (band = 0; band < NUM_NL80211_BANDS; band++) {
2178 if (!wiphy->bands[band])
2181 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
2182 /* ignore disabled channels */
2183 if (wiphy->bands[band]->channels[j].flags &
2184 IEEE80211_CHAN_DISABLED)
2187 /* If we have a wireless request structure and the
2188 * wireless request specifies frequencies, then search
2189 * for the matching hardware channel.
2191 if (wreq && wreq->num_channels) {
2193 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
2194 for (k = 0; k < wreq->num_channels; k++) {
2195 struct iw_freq *freq =
2196 &wreq->channel_list[k];
2198 cfg80211_wext_freq(freq);
2200 if (wext_freq == wiphy_freq)
2201 goto wext_freq_found;
2203 goto wext_freq_not_found;
2207 creq->channels[i] = &wiphy->bands[band]->channels[j];
2209 wext_freq_not_found: ;
2212 /* No channels found? */
2218 /* Set real number of channels specified in creq->channels[] */
2219 creq->n_channels = i;
2221 /* translate "Scan for SSID" request */
2223 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
2224 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
2228 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
2229 creq->ssids[0].ssid_len = wreq->essid_len;
2231 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
2235 for (i = 0; i < NUM_NL80211_BANDS; i++)
2236 if (wiphy->bands[i])
2237 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
2239 eth_broadcast_addr(creq->bssid);
2241 rdev->scan_req = creq;
2242 err = rdev_scan(rdev, creq);
2244 rdev->scan_req = NULL;
2245 /* creq will be freed below */
2247 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
2248 /* creq now owned by driver */
2256 EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
2258 static char *ieee80211_scan_add_ies(struct iw_request_info *info,
2259 const struct cfg80211_bss_ies *ies,
2260 char *current_ev, char *end_buf)
2262 const u8 *pos, *end, *next;
2263 struct iw_event iwe;
2269 * If needed, fragment the IEs buffer (at IE boundaries) into short
2270 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
2273 end = pos + ies->len;
2275 while (end - pos > IW_GENERIC_IE_MAX) {
2276 next = pos + 2 + pos[1];
2277 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
2278 next = next + 2 + next[1];
2280 memset(&iwe, 0, sizeof(iwe));
2281 iwe.cmd = IWEVGENIE;
2282 iwe.u.data.length = next - pos;
2283 current_ev = iwe_stream_add_point_check(info, current_ev,
2286 if (IS_ERR(current_ev))
2292 memset(&iwe, 0, sizeof(iwe));
2293 iwe.cmd = IWEVGENIE;
2294 iwe.u.data.length = end - pos;
2295 current_ev = iwe_stream_add_point_check(info, current_ev,
2298 if (IS_ERR(current_ev))
2306 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
2307 struct cfg80211_internal_bss *bss, char *current_ev,
2310 const struct cfg80211_bss_ies *ies;
2311 struct iw_event iwe;
2316 bool ismesh = false;
2318 memset(&iwe, 0, sizeof(iwe));
2319 iwe.cmd = SIOCGIWAP;
2320 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
2321 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
2322 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2324 if (IS_ERR(current_ev))
2327 memset(&iwe, 0, sizeof(iwe));
2328 iwe.cmd = SIOCGIWFREQ;
2329 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
2331 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2333 if (IS_ERR(current_ev))
2336 memset(&iwe, 0, sizeof(iwe));
2337 iwe.cmd = SIOCGIWFREQ;
2338 iwe.u.freq.m = bss->pub.channel->center_freq;
2340 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2342 if (IS_ERR(current_ev))
2345 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
2346 memset(&iwe, 0, sizeof(iwe));
2348 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
2349 IW_QUAL_NOISE_INVALID |
2350 IW_QUAL_QUAL_UPDATED;
2351 switch (wiphy->signal_type) {
2352 case CFG80211_SIGNAL_TYPE_MBM:
2353 sig = bss->pub.signal / 100;
2354 iwe.u.qual.level = sig;
2355 iwe.u.qual.updated |= IW_QUAL_DBM;
2356 if (sig < -110) /* rather bad */
2358 else if (sig > -40) /* perfect */
2360 /* will give a range of 0 .. 70 */
2361 iwe.u.qual.qual = sig + 110;
2363 case CFG80211_SIGNAL_TYPE_UNSPEC:
2364 iwe.u.qual.level = bss->pub.signal;
2365 /* will give range 0 .. 100 */
2366 iwe.u.qual.qual = bss->pub.signal;
2372 current_ev = iwe_stream_add_event_check(info, current_ev,
2375 if (IS_ERR(current_ev))
2379 memset(&iwe, 0, sizeof(iwe));
2380 iwe.cmd = SIOCGIWENCODE;
2381 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
2382 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
2384 iwe.u.data.flags = IW_ENCODE_DISABLED;
2385 iwe.u.data.length = 0;
2386 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
2388 if (IS_ERR(current_ev))
2392 ies = rcu_dereference(bss->pub.ies);
2398 if (ie[1] > rem - 2)
2403 memset(&iwe, 0, sizeof(iwe));
2404 iwe.cmd = SIOCGIWESSID;
2405 iwe.u.data.length = ie[1];
2406 iwe.u.data.flags = 1;
2407 current_ev = iwe_stream_add_point_check(info,
2411 if (IS_ERR(current_ev))
2414 case WLAN_EID_MESH_ID:
2415 memset(&iwe, 0, sizeof(iwe));
2416 iwe.cmd = SIOCGIWESSID;
2417 iwe.u.data.length = ie[1];
2418 iwe.u.data.flags = 1;
2419 current_ev = iwe_stream_add_point_check(info,
2423 if (IS_ERR(current_ev))
2426 case WLAN_EID_MESH_CONFIG:
2428 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
2431 memset(&iwe, 0, sizeof(iwe));
2432 iwe.cmd = IWEVCUSTOM;
2433 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
2435 iwe.u.data.length = strlen(buf);
2436 current_ev = iwe_stream_add_point_check(info,
2440 if (IS_ERR(current_ev))
2442 sprintf(buf, "Path Selection Metric ID: 0x%02X",
2444 iwe.u.data.length = strlen(buf);
2445 current_ev = iwe_stream_add_point_check(info,
2449 if (IS_ERR(current_ev))
2451 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
2453 iwe.u.data.length = strlen(buf);
2454 current_ev = iwe_stream_add_point_check(info,
2458 if (IS_ERR(current_ev))
2460 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
2461 iwe.u.data.length = strlen(buf);
2462 current_ev = iwe_stream_add_point_check(info,
2466 if (IS_ERR(current_ev))
2468 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
2469 iwe.u.data.length = strlen(buf);
2470 current_ev = iwe_stream_add_point_check(info,
2474 if (IS_ERR(current_ev))
2476 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
2477 iwe.u.data.length = strlen(buf);
2478 current_ev = iwe_stream_add_point_check(info,
2482 if (IS_ERR(current_ev))
2484 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
2485 iwe.u.data.length = strlen(buf);
2486 current_ev = iwe_stream_add_point_check(info,
2490 if (IS_ERR(current_ev))
2493 case WLAN_EID_SUPP_RATES:
2494 case WLAN_EID_EXT_SUPP_RATES:
2495 /* display all supported rates in readable format */
2496 p = current_ev + iwe_stream_lcp_len(info);
2498 memset(&iwe, 0, sizeof(iwe));
2499 iwe.cmd = SIOCGIWRATE;
2500 /* Those two flags are ignored... */
2501 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
2503 for (i = 0; i < ie[1]; i++) {
2504 iwe.u.bitrate.value =
2505 ((ie[i + 2] & 0x7f) * 500000);
2507 p = iwe_stream_add_value(info, current_ev, p,
2511 current_ev = ERR_PTR(-E2BIG);
2522 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
2524 memset(&iwe, 0, sizeof(iwe));
2525 iwe.cmd = SIOCGIWMODE;
2527 iwe.u.mode = IW_MODE_MESH;
2528 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
2529 iwe.u.mode = IW_MODE_MASTER;
2531 iwe.u.mode = IW_MODE_ADHOC;
2532 current_ev = iwe_stream_add_event_check(info, current_ev,
2535 if (IS_ERR(current_ev))
2539 memset(&iwe, 0, sizeof(iwe));
2540 iwe.cmd = IWEVCUSTOM;
2541 sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
2542 iwe.u.data.length = strlen(buf);
2543 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
2545 if (IS_ERR(current_ev))
2547 memset(&iwe, 0, sizeof(iwe));
2548 iwe.cmd = IWEVCUSTOM;
2549 sprintf(buf, " Last beacon: %ums ago",
2550 elapsed_jiffies_msecs(bss->ts));
2551 iwe.u.data.length = strlen(buf);
2552 current_ev = iwe_stream_add_point_check(info, current_ev,
2553 end_buf, &iwe, buf);
2554 if (IS_ERR(current_ev))
2557 current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
2565 static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
2566 struct iw_request_info *info,
2567 char *buf, size_t len)
2569 char *current_ev = buf;
2570 char *end_buf = buf + len;
2571 struct cfg80211_internal_bss *bss;
2574 spin_lock_bh(&rdev->bss_lock);
2575 cfg80211_bss_expire(rdev);
2577 list_for_each_entry(bss, &rdev->bss_list, list) {
2578 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
2582 current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
2583 current_ev, end_buf);
2584 if (IS_ERR(current_ev)) {
2585 err = PTR_ERR(current_ev);
2589 spin_unlock_bh(&rdev->bss_lock);
2593 return current_ev - buf;
2597 int cfg80211_wext_giwscan(struct net_device *dev,
2598 struct iw_request_info *info,
2599 struct iw_point *data, char *extra)
2601 struct cfg80211_registered_device *rdev;
2604 if (!netif_running(dev))
2607 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2610 return PTR_ERR(rdev);
2612 if (rdev->scan_req || rdev->scan_msg)
2615 res = ieee80211_scan_results(rdev, info, extra, data->length);
2624 EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan);