1 // SPDX-License-Identifier: GPL-2.0
3 * cfg80211 scan result handling
6 * Copyright 2013-2014 Intel Mobile Communications GmbH
7 * Copyright 2016 Intel Deutschland GmbH
8 * Copyright (C) 2018-2021 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>
17 #include <linux/crc32.h>
18 #include <linux/bitfield.h>
20 #include <net/cfg80211.h>
21 #include <net/cfg80211-wext.h>
22 #include <net/iw_handler.h>
25 #include "wext-compat.h"
29 * DOC: BSS tree/list structure
31 * At the top level, the BSS list is kept in both a list in each
32 * registered device (@bss_list) as well as an RB-tree for faster
33 * lookup. In the RB-tree, entries can be looked up using their
34 * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID
37 * Due to the possibility of hidden SSIDs, there's a second level
38 * structure, the "hidden_list" and "hidden_beacon_bss" pointer.
39 * The hidden_list connects all BSSes belonging to a single AP
40 * that has a hidden SSID, and connects beacon and probe response
41 * entries. For a probe response entry for a hidden SSID, the
42 * hidden_beacon_bss pointer points to the BSS struct holding the
43 * beacon's information.
45 * Reference counting is done for all these references except for
46 * the hidden_list, so that a beacon BSS struct that is otherwise
47 * not referenced has one reference for being on the bss_list and
48 * one for each probe response entry that points to it using the
49 * hidden_beacon_bss pointer. When a BSS struct that has such a
50 * pointer is get/put, the refcount update is also propagated to
51 * the referenced struct, this ensure that it cannot get removed
52 * while somebody is using the probe response version.
54 * Note that the hidden_beacon_bss pointer never changes, due to
55 * the reference counting. Therefore, no locking is needed for
58 * Also note that the hidden_beacon_bss pointer is only relevant
59 * if the driver uses something other than the IEs, e.g. private
60 * data stored in the BSS struct, since the beacon IEs are
61 * also linked into the probe response struct.
65 * Limit the number of BSS entries stored in mac80211. Each one is
66 * a bit over 4k at most, so this limits to roughly 4-5M of memory.
67 * If somebody wants to really attack this though, they'd likely
68 * use small beacons, and only one type of frame, limiting each of
69 * the entries to a much smaller size (in order to generate more
70 * entries in total, so overhead is bigger.)
72 static int bss_entries_limit = 1000;
73 module_param(bss_entries_limit, int, 0644);
74 MODULE_PARM_DESC(bss_entries_limit,
75 "limit to number of scan BSS entries (per wiphy, default 1000)");
77 #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ)
80 * struct cfg80211_colocated_ap - colocated AP information
82 * @list: linked list to all colocated aPS
83 * @bssid: BSSID of the reported AP
84 * @ssid: SSID of the reported AP
85 * @ssid_len: length of the ssid
86 * @center_freq: frequency the reported AP is on
87 * @unsolicited_probe: the reported AP is part of an ESS, where all the APs
88 * that operate in the same channel as the reported AP and that might be
89 * detected by a STA receiving this frame, are transmitting unsolicited
90 * Probe Response frames every 20 TUs
91 * @oct_recommended: OCT is recommended to exchange MMPDUs with the reported AP
92 * @same_ssid: the reported AP has the same SSID as the reporting AP
93 * @multi_bss: the reported AP is part of a multiple BSSID set
94 * @transmitted_bssid: the reported AP is the transmitting BSSID
95 * @colocated_ess: all the APs that share the same ESS as the reported AP are
96 * colocated and can be discovered via legacy bands.
97 * @short_ssid_valid: short_ssid is valid and can be used
98 * @short_ssid: the short SSID for this SSID
100 struct cfg80211_colocated_ap {
101 struct list_head list;
103 u8 ssid[IEEE80211_MAX_SSID_LEN];
107 u8 unsolicited_probe:1,
116 static void bss_free(struct cfg80211_internal_bss *bss)
118 struct cfg80211_bss_ies *ies;
120 if (WARN_ON(atomic_read(&bss->hold)))
123 ies = (void *)rcu_access_pointer(bss->pub.beacon_ies);
124 if (ies && !bss->pub.hidden_beacon_bss)
125 kfree_rcu(ies, rcu_head);
126 ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies);
128 kfree_rcu(ies, rcu_head);
131 * This happens when the module is removed, it doesn't
132 * really matter any more save for completeness
134 if (!list_empty(&bss->hidden_list))
135 list_del(&bss->hidden_list);
140 static inline void bss_ref_get(struct cfg80211_registered_device *rdev,
141 struct cfg80211_internal_bss *bss)
143 lockdep_assert_held(&rdev->bss_lock);
146 if (bss->pub.hidden_beacon_bss) {
147 bss = container_of(bss->pub.hidden_beacon_bss,
148 struct cfg80211_internal_bss,
152 if (bss->pub.transmitted_bss) {
153 bss = container_of(bss->pub.transmitted_bss,
154 struct cfg80211_internal_bss,
160 static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
161 struct cfg80211_internal_bss *bss)
163 lockdep_assert_held(&rdev->bss_lock);
165 if (bss->pub.hidden_beacon_bss) {
166 struct cfg80211_internal_bss *hbss;
167 hbss = container_of(bss->pub.hidden_beacon_bss,
168 struct cfg80211_internal_bss,
171 if (hbss->refcount == 0)
175 if (bss->pub.transmitted_bss) {
176 struct cfg80211_internal_bss *tbss;
178 tbss = container_of(bss->pub.transmitted_bss,
179 struct cfg80211_internal_bss,
182 if (tbss->refcount == 0)
187 if (bss->refcount == 0)
191 static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev,
192 struct cfg80211_internal_bss *bss)
194 lockdep_assert_held(&rdev->bss_lock);
196 if (!list_empty(&bss->hidden_list)) {
198 * don't remove the beacon entry if it has
199 * probe responses associated with it
201 if (!bss->pub.hidden_beacon_bss)
204 * if it's a probe response entry break its
205 * link to the other entries in the group
207 list_del_init(&bss->hidden_list);
210 list_del_init(&bss->list);
211 list_del_init(&bss->pub.nontrans_list);
212 rb_erase(&bss->rbn, &rdev->bss_tree);
214 WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list),
215 "rdev bss entries[%d]/list[empty:%d] corruption\n",
216 rdev->bss_entries, list_empty(&rdev->bss_list));
217 bss_ref_put(rdev, bss);
221 bool cfg80211_is_element_inherited(const struct element *elem,
222 const struct element *non_inherit_elem)
224 u8 id_len, ext_id_len, i, loop_len, id;
227 if (elem->id == WLAN_EID_MULTIPLE_BSSID)
230 if (!non_inherit_elem || non_inherit_elem->datalen < 2)
234 * non inheritance element format is:
235 * ext ID (56) | IDs list len | list | extension IDs list len | list
236 * Both lists are optional. Both lengths are mandatory.
237 * This means valid length is:
238 * elem_len = 1 (extension ID) + 2 (list len fields) + list lengths
240 id_len = non_inherit_elem->data[1];
241 if (non_inherit_elem->datalen < 3 + id_len)
244 ext_id_len = non_inherit_elem->data[2 + id_len];
245 if (non_inherit_elem->datalen < 3 + id_len + ext_id_len)
248 if (elem->id == WLAN_EID_EXTENSION) {
251 loop_len = ext_id_len;
252 list = &non_inherit_elem->data[3 + id_len];
258 list = &non_inherit_elem->data[2];
262 for (i = 0; i < loop_len; i++) {
269 EXPORT_SYMBOL(cfg80211_is_element_inherited);
271 static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen,
272 const u8 *subelement, size_t subie_len,
273 u8 *new_ie, gfp_t gfp)
276 const u8 *tmp_old, *tmp_new;
277 const struct element *non_inherit_elem;
280 /* copy subelement as we need to change its content to
281 * mark an ie after it is processed.
283 sub_copy = kmemdup(subelement, subie_len, gfp);
290 tmp_new = cfg80211_find_ie(WLAN_EID_SSID, sub_copy, subie_len);
292 memcpy(pos, tmp_new, tmp_new[1] + 2);
293 pos += (tmp_new[1] + 2);
296 /* get non inheritance list if exists */
298 cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE,
299 sub_copy, subie_len);
301 /* go through IEs in ie (skip SSID) and subelement,
302 * merge them into new_ie
304 tmp_old = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
305 tmp_old = (tmp_old) ? tmp_old + tmp_old[1] + 2 : ie;
307 while (tmp_old + tmp_old[1] + 2 - ie <= ielen) {
308 if (tmp_old[0] == 0) {
313 if (tmp_old[0] == WLAN_EID_EXTENSION)
314 tmp = (u8 *)cfg80211_find_ext_ie(tmp_old[2], sub_copy,
317 tmp = (u8 *)cfg80211_find_ie(tmp_old[0], sub_copy,
321 const struct element *old_elem = (void *)tmp_old;
323 /* ie in old ie but not in subelement */
324 if (cfg80211_is_element_inherited(old_elem,
326 memcpy(pos, tmp_old, tmp_old[1] + 2);
327 pos += tmp_old[1] + 2;
330 /* ie in transmitting ie also in subelement,
331 * copy from subelement and flag the ie in subelement
332 * as copied (by setting eid field to WLAN_EID_SSID,
333 * which is skipped anyway).
334 * For vendor ie, compare OUI + type + subType to
335 * determine if they are the same ie.
337 if (tmp_old[0] == WLAN_EID_VENDOR_SPECIFIC) {
338 if (!memcmp(tmp_old + 2, tmp + 2, 5)) {
339 /* same vendor ie, copy from
342 memcpy(pos, tmp, tmp[1] + 2);
344 tmp[0] = WLAN_EID_SSID;
346 memcpy(pos, tmp_old, tmp_old[1] + 2);
347 pos += tmp_old[1] + 2;
350 /* copy ie from subelement into new ie */
351 memcpy(pos, tmp, tmp[1] + 2);
353 tmp[0] = WLAN_EID_SSID;
357 if (tmp_old + tmp_old[1] + 2 - ie == ielen)
360 tmp_old += tmp_old[1] + 2;
363 /* go through subelement again to check if there is any ie not
364 * copied to new ie, skip ssid, capability, bssid-index ie
367 while (tmp_new + tmp_new[1] + 2 - sub_copy <= subie_len) {
368 if (!(tmp_new[0] == WLAN_EID_NON_TX_BSSID_CAP ||
369 tmp_new[0] == WLAN_EID_SSID)) {
370 memcpy(pos, tmp_new, tmp_new[1] + 2);
371 pos += tmp_new[1] + 2;
373 if (tmp_new + tmp_new[1] + 2 - sub_copy == subie_len)
375 tmp_new += tmp_new[1] + 2;
382 static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
383 const u8 *ssid, size_t ssid_len)
385 const struct cfg80211_bss_ies *ies;
386 const struct element *ssid_elem;
388 if (bssid && !ether_addr_equal(a->bssid, bssid))
394 ies = rcu_access_pointer(a->ies);
397 ssid_elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len);
400 if (ssid_elem->datalen != ssid_len)
402 return memcmp(ssid_elem->data, ssid, ssid_len) == 0;
406 cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss,
407 struct cfg80211_bss *nontrans_bss)
411 struct cfg80211_bss *bss = NULL;
414 ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
422 /* check if nontrans_bss is in the list */
423 list_for_each_entry(bss, &trans_bss->nontrans_list, nontrans_list) {
424 if (is_bss(bss, nontrans_bss->bssid, ssid, ssid_len)) {
432 /* add to the list */
433 list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list);
437 static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev,
438 unsigned long expire_time)
440 struct cfg80211_internal_bss *bss, *tmp;
441 bool expired = false;
443 lockdep_assert_held(&rdev->bss_lock);
445 list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) {
446 if (atomic_read(&bss->hold))
448 if (!time_after(expire_time, bss->ts))
451 if (__cfg80211_unlink_bss(rdev, bss))
456 rdev->bss_generation++;
459 static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev)
461 struct cfg80211_internal_bss *bss, *oldest = NULL;
464 lockdep_assert_held(&rdev->bss_lock);
466 list_for_each_entry(bss, &rdev->bss_list, list) {
467 if (atomic_read(&bss->hold))
470 if (!list_empty(&bss->hidden_list) &&
471 !bss->pub.hidden_beacon_bss)
474 if (oldest && time_before(oldest->ts, bss->ts))
479 if (WARN_ON(!oldest))
483 * The callers make sure to increase rdev->bss_generation if anything
484 * gets removed (and a new entry added), so there's no need to also do
488 ret = __cfg80211_unlink_bss(rdev, oldest);
493 static u8 cfg80211_parse_bss_param(u8 data,
494 struct cfg80211_colocated_ap *coloc_ap)
496 coloc_ap->oct_recommended =
497 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_OCT_RECOMMENDED);
498 coloc_ap->same_ssid =
499 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_SAME_SSID);
500 coloc_ap->multi_bss =
501 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID);
502 coloc_ap->transmitted_bssid =
503 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_TRANSMITTED_BSSID);
504 coloc_ap->unsolicited_probe =
505 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_PROBE_ACTIVE);
506 coloc_ap->colocated_ess =
507 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_ESS);
509 return u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_AP);
512 static int cfg80211_calc_short_ssid(const struct cfg80211_bss_ies *ies,
513 const struct element **elem, u32 *s_ssid)
516 *elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len);
517 if (!*elem || (*elem)->datalen > IEEE80211_MAX_SSID_LEN)
520 *s_ssid = ~crc32_le(~0, (*elem)->data, (*elem)->datalen);
524 static void cfg80211_free_coloc_ap_list(struct list_head *coloc_ap_list)
526 struct cfg80211_colocated_ap *ap, *tmp_ap;
528 list_for_each_entry_safe(ap, tmp_ap, coloc_ap_list, list) {
534 static int cfg80211_parse_ap_info(struct cfg80211_colocated_ap *entry,
535 const u8 *pos, u8 length,
536 const struct element *ssid_elem,
539 /* skip the TBTT offset */
542 memcpy(entry->bssid, pos, ETH_ALEN);
545 if (length == IEEE80211_TBTT_INFO_OFFSET_BSSID_SSSID_BSS_PARAM) {
546 memcpy(&entry->short_ssid, pos,
547 sizeof(entry->short_ssid));
548 entry->short_ssid_valid = true;
552 /* skip non colocated APs */
553 if (!cfg80211_parse_bss_param(*pos, entry))
557 if (length == IEEE80211_TBTT_INFO_OFFSET_BSSID_BSS_PARAM) {
559 * no information about the short ssid. Consider the entry valid
560 * for now. It would later be dropped in case there are explicit
561 * SSIDs that need to be matched
563 if (!entry->same_ssid)
567 if (entry->same_ssid) {
568 entry->short_ssid = s_ssid_tmp;
569 entry->short_ssid_valid = true;
572 * This is safe because we validate datalen in
573 * cfg80211_parse_colocated_ap(), before calling this
576 memcpy(&entry->ssid, &ssid_elem->data,
578 entry->ssid_len = ssid_elem->datalen;
583 static int cfg80211_parse_colocated_ap(const struct cfg80211_bss_ies *ies,
584 struct list_head *list)
586 struct ieee80211_neighbor_ap_info *ap_info;
587 const struct element *elem, *ssid_elem;
590 int n_coloc = 0, ret;
593 elem = cfg80211_find_elem(WLAN_EID_REDUCED_NEIGHBOR_REPORT, ies->data,
599 end = pos + elem->datalen;
601 ret = cfg80211_calc_short_ssid(ies, &ssid_elem, &s_ssid_tmp);
605 /* RNR IE may contain more than one NEIGHBOR_AP_INFO */
606 while (pos + sizeof(*ap_info) <= end) {
607 enum nl80211_band band;
611 ap_info = (void *)pos;
612 count = u8_get_bits(ap_info->tbtt_info_hdr,
613 IEEE80211_AP_INFO_TBTT_HDR_COUNT) + 1;
614 length = ap_info->tbtt_info_len;
616 pos += sizeof(*ap_info);
618 if (!ieee80211_operating_class_to_band(ap_info->op_class,
622 freq = ieee80211_channel_to_frequency(ap_info->channel, band);
624 if (end - pos < count * length)
628 * TBTT info must include bss param + BSSID +
629 * (short SSID or same_ssid bit to be set).
630 * ignore other options, and move to the
633 if (band != NL80211_BAND_6GHZ ||
634 (length != IEEE80211_TBTT_INFO_OFFSET_BSSID_BSS_PARAM &&
635 length < IEEE80211_TBTT_INFO_OFFSET_BSSID_SSSID_BSS_PARAM)) {
636 pos += count * length;
640 for (i = 0; i < count; i++) {
641 struct cfg80211_colocated_ap *entry;
643 entry = kzalloc(sizeof(*entry) + IEEE80211_MAX_SSID_LEN,
649 entry->center_freq = freq;
651 if (!cfg80211_parse_ap_info(entry, pos, length,
652 ssid_elem, s_ssid_tmp)) {
654 list_add_tail(&entry->list, &ap_list);
664 cfg80211_free_coloc_ap_list(&ap_list);
668 list_splice_tail(&ap_list, list);
672 static void cfg80211_scan_req_add_chan(struct cfg80211_scan_request *request,
673 struct ieee80211_channel *chan,
677 u32 n_channels = request->n_channels;
678 struct cfg80211_scan_6ghz_params *params =
679 &request->scan_6ghz_params[request->n_6ghz_params];
681 for (i = 0; i < n_channels; i++) {
682 if (request->channels[i] == chan) {
684 params->channel_idx = i;
689 request->channels[n_channels] = chan;
691 request->scan_6ghz_params[request->n_6ghz_params].channel_idx =
694 request->n_channels++;
697 static bool cfg80211_find_ssid_match(struct cfg80211_colocated_ap *ap,
698 struct cfg80211_scan_request *request)
703 for (i = 0; i < request->n_ssids; i++) {
704 /* wildcard ssid in the scan request */
705 if (!request->ssids[i].ssid_len)
709 ap->ssid_len == request->ssids[i].ssid_len) {
710 if (!memcmp(request->ssids[i].ssid, ap->ssid,
713 } else if (ap->short_ssid_valid) {
714 s_ssid = ~crc32_le(~0, request->ssids[i].ssid,
715 request->ssids[i].ssid_len);
717 if (ap->short_ssid == s_ssid)
725 static int cfg80211_scan_6ghz(struct cfg80211_registered_device *rdev)
728 struct cfg80211_colocated_ap *ap;
729 int n_channels, count = 0, err;
730 struct cfg80211_scan_request *request, *rdev_req = rdev->scan_req;
731 LIST_HEAD(coloc_ap_list);
732 bool need_scan_psc = true;
733 const struct ieee80211_sband_iftype_data *iftd;
735 rdev_req->scan_6ghz = true;
737 if (!rdev->wiphy.bands[NL80211_BAND_6GHZ])
740 iftd = ieee80211_get_sband_iftype_data(rdev->wiphy.bands[NL80211_BAND_6GHZ],
741 rdev_req->wdev->iftype);
742 if (!iftd || !iftd->he_cap.has_he)
745 n_channels = rdev->wiphy.bands[NL80211_BAND_6GHZ]->n_channels;
747 if (rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ) {
748 struct cfg80211_internal_bss *intbss;
750 spin_lock_bh(&rdev->bss_lock);
751 list_for_each_entry(intbss, &rdev->bss_list, list) {
752 struct cfg80211_bss *res = &intbss->pub;
753 const struct cfg80211_bss_ies *ies;
755 ies = rcu_access_pointer(res->ies);
756 count += cfg80211_parse_colocated_ap(ies,
759 spin_unlock_bh(&rdev->bss_lock);
762 request = kzalloc(struct_size(request, channels, n_channels) +
763 sizeof(*request->scan_6ghz_params) * count +
764 sizeof(*request->ssids) * rdev_req->n_ssids,
767 cfg80211_free_coloc_ap_list(&coloc_ap_list);
771 *request = *rdev_req;
772 request->n_channels = 0;
773 request->scan_6ghz_params =
774 (void *)&request->channels[n_channels];
777 * PSC channels should not be scanned in case of direct scan with 1 SSID
778 * and at least one of the reported co-located APs with same SSID
779 * indicating that all APs in the same ESS are co-located
781 if (count && request->n_ssids == 1 && request->ssids[0].ssid_len) {
782 list_for_each_entry(ap, &coloc_ap_list, list) {
783 if (ap->colocated_ess &&
784 cfg80211_find_ssid_match(ap, request)) {
785 need_scan_psc = false;
792 * add to the scan request the channels that need to be scanned
793 * regardless of the collocated APs (PSC channels or all channels
794 * in case that NL80211_SCAN_FLAG_COLOCATED_6GHZ is not set)
796 for (i = 0; i < rdev_req->n_channels; i++) {
797 if (rdev_req->channels[i]->band == NL80211_BAND_6GHZ &&
799 cfg80211_channel_is_psc(rdev_req->channels[i])) ||
800 !(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))) {
801 cfg80211_scan_req_add_chan(request,
802 rdev_req->channels[i],
807 if (!(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))
810 list_for_each_entry(ap, &coloc_ap_list, list) {
812 struct cfg80211_scan_6ghz_params *scan_6ghz_params =
813 &request->scan_6ghz_params[request->n_6ghz_params];
814 struct ieee80211_channel *chan =
815 ieee80211_get_channel(&rdev->wiphy, ap->center_freq);
817 if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
820 for (i = 0; i < rdev_req->n_channels; i++) {
821 if (rdev_req->channels[i] == chan)
828 if (request->n_ssids > 0 &&
829 !cfg80211_find_ssid_match(ap, request))
832 cfg80211_scan_req_add_chan(request, chan, true);
833 memcpy(scan_6ghz_params->bssid, ap->bssid, ETH_ALEN);
834 scan_6ghz_params->short_ssid = ap->short_ssid;
835 scan_6ghz_params->short_ssid_valid = ap->short_ssid_valid;
836 scan_6ghz_params->unsolicited_probe = ap->unsolicited_probe;
839 * If a PSC channel is added to the scan and 'need_scan_psc' is
840 * set to false, then all the APs that the scan logic is
841 * interested with on the channel are collocated and thus there
842 * is no need to perform the initial PSC channel listen.
844 if (cfg80211_channel_is_psc(chan) && !need_scan_psc)
845 scan_6ghz_params->psc_no_listen = true;
847 request->n_6ghz_params++;
851 cfg80211_free_coloc_ap_list(&coloc_ap_list);
853 if (request->n_channels) {
854 struct cfg80211_scan_request *old = rdev->int_scan_req;
855 rdev->int_scan_req = request;
858 * Add the ssids from the parent scan request to the new scan
859 * request, so the driver would be able to use them in its
860 * probe requests to discover hidden APs on PSC channels.
862 request->ssids = (void *)&request->channels[request->n_channels];
863 request->n_ssids = rdev_req->n_ssids;
864 memcpy(request->ssids, rdev_req->ssids, sizeof(*request->ssids) *
868 * If this scan follows a previous scan, save the scan start
869 * info from the first part of the scan
872 rdev->int_scan_req->info = old->info;
874 err = rdev_scan(rdev, request);
876 rdev->int_scan_req = old;
889 int cfg80211_scan(struct cfg80211_registered_device *rdev)
891 struct cfg80211_scan_request *request;
892 struct cfg80211_scan_request *rdev_req = rdev->scan_req;
893 u32 n_channels = 0, idx, i;
895 if (!(rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ))
896 return rdev_scan(rdev, rdev_req);
898 for (i = 0; i < rdev_req->n_channels; i++) {
899 if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ)
904 return cfg80211_scan_6ghz(rdev);
906 request = kzalloc(struct_size(request, channels, n_channels),
911 *request = *rdev_req;
912 request->n_channels = n_channels;
914 for (i = idx = 0; i < rdev_req->n_channels; i++) {
915 if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ)
916 request->channels[idx++] = rdev_req->channels[i];
919 rdev_req->scan_6ghz = false;
920 rdev->int_scan_req = request;
921 return rdev_scan(rdev, request);
924 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
927 struct cfg80211_scan_request *request, *rdev_req;
928 struct wireless_dev *wdev;
930 #ifdef CONFIG_CFG80211_WEXT
931 union iwreq_data wrqu;
934 lockdep_assert_held(&rdev->wiphy.mtx);
936 if (rdev->scan_msg) {
937 nl80211_send_scan_msg(rdev, rdev->scan_msg);
938 rdev->scan_msg = NULL;
942 rdev_req = rdev->scan_req;
946 wdev = rdev_req->wdev;
947 request = rdev->int_scan_req ? rdev->int_scan_req : rdev_req;
949 if (wdev_running(wdev) &&
950 (rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ) &&
951 !rdev_req->scan_6ghz && !request->info.aborted &&
952 !cfg80211_scan_6ghz(rdev))
956 * This must be before sending the other events!
957 * Otherwise, wpa_supplicant gets completely confused with
961 cfg80211_sme_scan_done(wdev->netdev);
963 if (!request->info.aborted &&
964 request->flags & NL80211_SCAN_FLAG_FLUSH) {
965 /* flush entries from previous scans */
966 spin_lock_bh(&rdev->bss_lock);
967 __cfg80211_bss_expire(rdev, request->scan_start);
968 spin_unlock_bh(&rdev->bss_lock);
971 msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted);
973 #ifdef CONFIG_CFG80211_WEXT
974 if (wdev->netdev && !request->info.aborted) {
975 memset(&wrqu, 0, sizeof(wrqu));
977 wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
981 dev_put(wdev->netdev);
983 kfree(rdev->int_scan_req);
984 rdev->int_scan_req = NULL;
986 kfree(rdev->scan_req);
987 rdev->scan_req = NULL;
990 rdev->scan_msg = msg;
992 nl80211_send_scan_msg(rdev, msg);
995 void __cfg80211_scan_done(struct work_struct *wk)
997 struct cfg80211_registered_device *rdev;
999 rdev = container_of(wk, struct cfg80211_registered_device,
1002 wiphy_lock(&rdev->wiphy);
1003 ___cfg80211_scan_done(rdev, true);
1004 wiphy_unlock(&rdev->wiphy);
1007 void cfg80211_scan_done(struct cfg80211_scan_request *request,
1008 struct cfg80211_scan_info *info)
1010 struct cfg80211_scan_info old_info = request->info;
1012 trace_cfg80211_scan_done(request, info);
1013 WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req &&
1014 request != wiphy_to_rdev(request->wiphy)->int_scan_req);
1016 request->info = *info;
1019 * In case the scan is split, the scan_start_tsf and tsf_bssid should
1020 * be of the first part. In such a case old_info.scan_start_tsf should
1023 if (request->scan_6ghz && old_info.scan_start_tsf) {
1024 request->info.scan_start_tsf = old_info.scan_start_tsf;
1025 memcpy(request->info.tsf_bssid, old_info.tsf_bssid,
1026 sizeof(request->info.tsf_bssid));
1029 request->notified = true;
1030 queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk);
1032 EXPORT_SYMBOL(cfg80211_scan_done);
1034 void cfg80211_add_sched_scan_req(struct cfg80211_registered_device *rdev,
1035 struct cfg80211_sched_scan_request *req)
1037 lockdep_assert_held(&rdev->wiphy.mtx);
1039 list_add_rcu(&req->list, &rdev->sched_scan_req_list);
1042 static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device *rdev,
1043 struct cfg80211_sched_scan_request *req)
1045 lockdep_assert_held(&rdev->wiphy.mtx);
1047 list_del_rcu(&req->list);
1048 kfree_rcu(req, rcu_head);
1051 static struct cfg80211_sched_scan_request *
1052 cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid)
1054 struct cfg80211_sched_scan_request *pos;
1056 list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list,
1057 lockdep_is_held(&rdev->wiphy.mtx)) {
1058 if (pos->reqid == reqid)
1065 * Determines if a scheduled scan request can be handled. When a legacy
1066 * scheduled scan is running no other scheduled scan is allowed regardless
1067 * whether the request is for legacy or multi-support scan. When a multi-support
1068 * scheduled scan is running a request for legacy scan is not allowed. In this
1069 * case a request for multi-support scan can be handled if resources are
1070 * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached.
1072 int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev,
1075 struct cfg80211_sched_scan_request *pos;
1078 list_for_each_entry(pos, &rdev->sched_scan_req_list, list) {
1079 /* request id zero means legacy in progress */
1080 if (!i && !pos->reqid)
1081 return -EINPROGRESS;
1086 /* no legacy allowed when multi request(s) are active */
1088 return -EINPROGRESS;
1090 /* resource limit reached */
1091 if (i == rdev->wiphy.max_sched_scan_reqs)
1097 void cfg80211_sched_scan_results_wk(struct work_struct *work)
1099 struct cfg80211_registered_device *rdev;
1100 struct cfg80211_sched_scan_request *req, *tmp;
1102 rdev = container_of(work, struct cfg80211_registered_device,
1105 wiphy_lock(&rdev->wiphy);
1106 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
1107 if (req->report_results) {
1108 req->report_results = false;
1109 if (req->flags & NL80211_SCAN_FLAG_FLUSH) {
1110 /* flush entries from previous scans */
1111 spin_lock_bh(&rdev->bss_lock);
1112 __cfg80211_bss_expire(rdev, req->scan_start);
1113 spin_unlock_bh(&rdev->bss_lock);
1114 req->scan_start = jiffies;
1116 nl80211_send_sched_scan(req,
1117 NL80211_CMD_SCHED_SCAN_RESULTS);
1120 wiphy_unlock(&rdev->wiphy);
1123 void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid)
1125 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1126 struct cfg80211_sched_scan_request *request;
1128 trace_cfg80211_sched_scan_results(wiphy, reqid);
1129 /* ignore if we're not scanning */
1132 request = cfg80211_find_sched_scan_req(rdev, reqid);
1134 request->report_results = true;
1135 queue_work(cfg80211_wq, &rdev->sched_scan_res_wk);
1139 EXPORT_SYMBOL(cfg80211_sched_scan_results);
1141 void cfg80211_sched_scan_stopped_locked(struct wiphy *wiphy, u64 reqid)
1143 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1145 lockdep_assert_held(&wiphy->mtx);
1147 trace_cfg80211_sched_scan_stopped(wiphy, reqid);
1149 __cfg80211_stop_sched_scan(rdev, reqid, true);
1151 EXPORT_SYMBOL(cfg80211_sched_scan_stopped_locked);
1153 void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid)
1156 cfg80211_sched_scan_stopped_locked(wiphy, reqid);
1157 wiphy_unlock(wiphy);
1159 EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
1161 int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev,
1162 struct cfg80211_sched_scan_request *req,
1163 bool driver_initiated)
1165 lockdep_assert_held(&rdev->wiphy.mtx);
1167 if (!driver_initiated) {
1168 int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid);
1173 nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED);
1175 cfg80211_del_sched_scan_req(rdev, req);
1180 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
1181 u64 reqid, bool driver_initiated)
1183 struct cfg80211_sched_scan_request *sched_scan_req;
1185 lockdep_assert_held(&rdev->wiphy.mtx);
1187 sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid);
1188 if (!sched_scan_req)
1191 return cfg80211_stop_sched_scan_req(rdev, sched_scan_req,
1195 void cfg80211_bss_age(struct cfg80211_registered_device *rdev,
1196 unsigned long age_secs)
1198 struct cfg80211_internal_bss *bss;
1199 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
1201 spin_lock_bh(&rdev->bss_lock);
1202 list_for_each_entry(bss, &rdev->bss_list, list)
1203 bss->ts -= age_jiffies;
1204 spin_unlock_bh(&rdev->bss_lock);
1207 void cfg80211_bss_expire(struct cfg80211_registered_device *rdev)
1209 __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
1212 void cfg80211_bss_flush(struct wiphy *wiphy)
1214 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1216 spin_lock_bh(&rdev->bss_lock);
1217 __cfg80211_bss_expire(rdev, jiffies);
1218 spin_unlock_bh(&rdev->bss_lock);
1220 EXPORT_SYMBOL(cfg80211_bss_flush);
1222 const struct element *
1223 cfg80211_find_elem_match(u8 eid, const u8 *ies, unsigned int len,
1224 const u8 *match, unsigned int match_len,
1225 unsigned int match_offset)
1227 const struct element *elem;
1229 for_each_element_id(elem, eid, ies, len) {
1230 if (elem->datalen >= match_offset + match_len &&
1231 !memcmp(elem->data + match_offset, match, match_len))
1237 EXPORT_SYMBOL(cfg80211_find_elem_match);
1239 const struct element *cfg80211_find_vendor_elem(unsigned int oui, int oui_type,
1243 const struct element *elem;
1244 u8 match[] = { oui >> 16, oui >> 8, oui, oui_type };
1245 int match_len = (oui_type < 0) ? 3 : sizeof(match);
1247 if (WARN_ON(oui_type > 0xff))
1250 elem = cfg80211_find_elem_match(WLAN_EID_VENDOR_SPECIFIC, ies, len,
1251 match, match_len, 0);
1253 if (!elem || elem->datalen < 4)
1258 EXPORT_SYMBOL(cfg80211_find_vendor_elem);
1261 * enum bss_compare_mode - BSS compare mode
1262 * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
1263 * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
1264 * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
1266 enum bss_compare_mode {
1272 static int cmp_bss(struct cfg80211_bss *a,
1273 struct cfg80211_bss *b,
1274 enum bss_compare_mode mode)
1276 const struct cfg80211_bss_ies *a_ies, *b_ies;
1277 const u8 *ie1 = NULL;
1278 const u8 *ie2 = NULL;
1281 if (a->channel != b->channel)
1282 return b->channel->center_freq - a->channel->center_freq;
1284 a_ies = rcu_access_pointer(a->ies);
1287 b_ies = rcu_access_pointer(b->ies);
1291 if (WLAN_CAPABILITY_IS_STA_BSS(a->capability))
1292 ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID,
1293 a_ies->data, a_ies->len);
1294 if (WLAN_CAPABILITY_IS_STA_BSS(b->capability))
1295 ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID,
1296 b_ies->data, b_ies->len);
1300 if (ie1[1] == ie2[1])
1301 mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]);
1303 mesh_id_cmp = ie2[1] - ie1[1];
1305 ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
1306 a_ies->data, a_ies->len);
1307 ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
1308 b_ies->data, b_ies->len);
1312 if (ie1[1] != ie2[1])
1313 return ie2[1] - ie1[1];
1314 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
1318 r = memcmp(a->bssid, b->bssid, sizeof(a->bssid));
1322 ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
1323 ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
1329 * Note that with "hide_ssid", the function returns a match if
1330 * the already-present BSS ("b") is a hidden SSID beacon for
1331 * the new BSS ("a").
1334 /* sort missing IE before (left of) present IE */
1341 case BSS_CMP_HIDE_ZLEN:
1343 * In ZLEN mode we assume the BSS entry we're
1344 * looking for has a zero-length SSID. So if
1345 * the one we're looking at right now has that,
1346 * return 0. Otherwise, return the difference
1347 * in length, but since we're looking for the
1348 * 0-length it's really equivalent to returning
1349 * the length of the one we're looking at.
1351 * No content comparison is needed as we assume
1352 * the content length is zero.
1355 case BSS_CMP_REGULAR:
1357 /* sort by length first, then by contents */
1358 if (ie1[1] != ie2[1])
1359 return ie2[1] - ie1[1];
1360 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
1361 case BSS_CMP_HIDE_NUL:
1362 if (ie1[1] != ie2[1])
1363 return ie2[1] - ie1[1];
1364 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */
1365 for (i = 0; i < ie2[1]; i++)
1372 static bool cfg80211_bss_type_match(u16 capability,
1373 enum nl80211_band band,
1374 enum ieee80211_bss_type bss_type)
1379 if (bss_type == IEEE80211_BSS_TYPE_ANY)
1382 if (band == NL80211_BAND_60GHZ) {
1383 mask = WLAN_CAPABILITY_DMG_TYPE_MASK;
1385 case IEEE80211_BSS_TYPE_ESS:
1386 val = WLAN_CAPABILITY_DMG_TYPE_AP;
1388 case IEEE80211_BSS_TYPE_PBSS:
1389 val = WLAN_CAPABILITY_DMG_TYPE_PBSS;
1391 case IEEE80211_BSS_TYPE_IBSS:
1392 val = WLAN_CAPABILITY_DMG_TYPE_IBSS;
1398 mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS;
1400 case IEEE80211_BSS_TYPE_ESS:
1401 val = WLAN_CAPABILITY_ESS;
1403 case IEEE80211_BSS_TYPE_IBSS:
1404 val = WLAN_CAPABILITY_IBSS;
1406 case IEEE80211_BSS_TYPE_MBSS:
1414 ret = ((capability & mask) == val);
1418 /* Returned bss is reference counted and must be cleaned up appropriately. */
1419 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
1420 struct ieee80211_channel *channel,
1422 const u8 *ssid, size_t ssid_len,
1423 enum ieee80211_bss_type bss_type,
1424 enum ieee80211_privacy privacy)
1426 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1427 struct cfg80211_internal_bss *bss, *res = NULL;
1428 unsigned long now = jiffies;
1431 trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type,
1434 spin_lock_bh(&rdev->bss_lock);
1436 list_for_each_entry(bss, &rdev->bss_list, list) {
1437 if (!cfg80211_bss_type_match(bss->pub.capability,
1438 bss->pub.channel->band, bss_type))
1441 bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY);
1442 if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) ||
1443 (privacy == IEEE80211_PRIVACY_OFF && bss_privacy))
1445 if (channel && bss->pub.channel != channel)
1447 if (!is_valid_ether_addr(bss->pub.bssid))
1449 /* Don't get expired BSS structs */
1450 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
1451 !atomic_read(&bss->hold))
1453 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
1455 bss_ref_get(rdev, res);
1460 spin_unlock_bh(&rdev->bss_lock);
1463 trace_cfg80211_return_bss(&res->pub);
1466 EXPORT_SYMBOL(cfg80211_get_bss);
1468 static void rb_insert_bss(struct cfg80211_registered_device *rdev,
1469 struct cfg80211_internal_bss *bss)
1471 struct rb_node **p = &rdev->bss_tree.rb_node;
1472 struct rb_node *parent = NULL;
1473 struct cfg80211_internal_bss *tbss;
1478 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
1480 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR);
1482 if (WARN_ON(!cmp)) {
1483 /* will sort of leak this BSS */
1490 p = &(*p)->rb_right;
1493 rb_link_node(&bss->rbn, parent, p);
1494 rb_insert_color(&bss->rbn, &rdev->bss_tree);
1497 static struct cfg80211_internal_bss *
1498 rb_find_bss(struct cfg80211_registered_device *rdev,
1499 struct cfg80211_internal_bss *res,
1500 enum bss_compare_mode mode)
1502 struct rb_node *n = rdev->bss_tree.rb_node;
1503 struct cfg80211_internal_bss *bss;
1507 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
1508 r = cmp_bss(&res->pub, &bss->pub, mode);
1521 static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev,
1522 struct cfg80211_internal_bss *new)
1524 const struct cfg80211_bss_ies *ies;
1525 struct cfg80211_internal_bss *bss;
1531 ies = rcu_access_pointer(new->pub.beacon_ies);
1535 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
1542 for (i = 0; i < ssidlen; i++)
1546 /* not a hidden SSID */
1550 /* This is the bad part ... */
1552 list_for_each_entry(bss, &rdev->bss_list, list) {
1554 * we're iterating all the entries anyway, so take the
1555 * opportunity to validate the list length accounting
1559 if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid))
1561 if (bss->pub.channel != new->pub.channel)
1563 if (bss->pub.scan_width != new->pub.scan_width)
1565 if (rcu_access_pointer(bss->pub.beacon_ies))
1567 ies = rcu_access_pointer(bss->pub.ies);
1570 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
1573 if (ssidlen && ie[1] != ssidlen)
1575 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss))
1577 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list)))
1578 list_del(&bss->hidden_list);
1580 list_add(&bss->hidden_list, &new->hidden_list);
1581 bss->pub.hidden_beacon_bss = &new->pub;
1582 new->refcount += bss->refcount;
1583 rcu_assign_pointer(bss->pub.beacon_ies,
1584 new->pub.beacon_ies);
1587 WARN_ONCE(n_entries != rdev->bss_entries,
1588 "rdev bss entries[%d]/list[len:%d] corruption\n",
1589 rdev->bss_entries, n_entries);
1594 struct cfg80211_non_tx_bss {
1595 struct cfg80211_bss *tx_bss;
1596 u8 max_bssid_indicator;
1601 cfg80211_update_known_bss(struct cfg80211_registered_device *rdev,
1602 struct cfg80211_internal_bss *known,
1603 struct cfg80211_internal_bss *new,
1606 lockdep_assert_held(&rdev->bss_lock);
1609 if (rcu_access_pointer(new->pub.proberesp_ies)) {
1610 const struct cfg80211_bss_ies *old;
1612 old = rcu_access_pointer(known->pub.proberesp_ies);
1614 rcu_assign_pointer(known->pub.proberesp_ies,
1615 new->pub.proberesp_ies);
1616 /* Override possible earlier Beacon frame IEs */
1617 rcu_assign_pointer(known->pub.ies,
1618 new->pub.proberesp_ies);
1620 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1621 } else if (rcu_access_pointer(new->pub.beacon_ies)) {
1622 const struct cfg80211_bss_ies *old;
1623 struct cfg80211_internal_bss *bss;
1625 if (known->pub.hidden_beacon_bss &&
1626 !list_empty(&known->hidden_list)) {
1627 const struct cfg80211_bss_ies *f;
1629 /* The known BSS struct is one of the probe
1630 * response members of a group, but we're
1631 * receiving a beacon (beacon_ies in the new
1632 * bss is used). This can only mean that the
1633 * AP changed its beacon from not having an
1634 * SSID to showing it, which is confusing so
1635 * drop this information.
1638 f = rcu_access_pointer(new->pub.beacon_ies);
1639 kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head);
1643 old = rcu_access_pointer(known->pub.beacon_ies);
1645 rcu_assign_pointer(known->pub.beacon_ies, new->pub.beacon_ies);
1647 /* Override IEs if they were from a beacon before */
1648 if (old == rcu_access_pointer(known->pub.ies))
1649 rcu_assign_pointer(known->pub.ies, new->pub.beacon_ies);
1651 /* Assign beacon IEs to all sub entries */
1652 list_for_each_entry(bss, &known->hidden_list, hidden_list) {
1653 const struct cfg80211_bss_ies *ies;
1655 ies = rcu_access_pointer(bss->pub.beacon_ies);
1656 WARN_ON(ies != old);
1658 rcu_assign_pointer(bss->pub.beacon_ies,
1659 new->pub.beacon_ies);
1663 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1666 known->pub.beacon_interval = new->pub.beacon_interval;
1668 /* don't update the signal if beacon was heard on
1672 known->pub.signal = new->pub.signal;
1673 known->pub.capability = new->pub.capability;
1674 known->ts = new->ts;
1675 known->ts_boottime = new->ts_boottime;
1676 known->parent_tsf = new->parent_tsf;
1677 known->pub.chains = new->pub.chains;
1678 memcpy(known->pub.chain_signal, new->pub.chain_signal,
1679 IEEE80211_MAX_CHAINS);
1680 ether_addr_copy(known->parent_bssid, new->parent_bssid);
1681 known->pub.max_bssid_indicator = new->pub.max_bssid_indicator;
1682 known->pub.bssid_index = new->pub.bssid_index;
1687 /* Returned bss is reference counted and must be cleaned up appropriately. */
1688 struct cfg80211_internal_bss *
1689 cfg80211_bss_update(struct cfg80211_registered_device *rdev,
1690 struct cfg80211_internal_bss *tmp,
1691 bool signal_valid, unsigned long ts)
1693 struct cfg80211_internal_bss *found = NULL;
1695 if (WARN_ON(!tmp->pub.channel))
1700 spin_lock_bh(&rdev->bss_lock);
1702 if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
1703 spin_unlock_bh(&rdev->bss_lock);
1707 found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR);
1710 if (!cfg80211_update_known_bss(rdev, found, tmp, signal_valid))
1713 struct cfg80211_internal_bss *new;
1714 struct cfg80211_internal_bss *hidden;
1715 struct cfg80211_bss_ies *ies;
1718 * create a copy -- the "res" variable that is passed in
1719 * is allocated on the stack since it's not needed in the
1720 * more common case of an update
1722 new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size,
1725 ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
1727 kfree_rcu(ies, rcu_head);
1728 ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
1730 kfree_rcu(ies, rcu_head);
1733 memcpy(new, tmp, sizeof(*new));
1735 INIT_LIST_HEAD(&new->hidden_list);
1736 INIT_LIST_HEAD(&new->pub.nontrans_list);
1738 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
1739 hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
1741 hidden = rb_find_bss(rdev, tmp,
1744 new->pub.hidden_beacon_bss = &hidden->pub;
1745 list_add(&new->hidden_list,
1746 &hidden->hidden_list);
1748 rcu_assign_pointer(new->pub.beacon_ies,
1749 hidden->pub.beacon_ies);
1753 * Ok so we found a beacon, and don't have an entry. If
1754 * it's a beacon with hidden SSID, we might be in for an
1755 * expensive search for any probe responses that should
1756 * be grouped with this beacon for updates ...
1758 if (!cfg80211_combine_bsses(rdev, new)) {
1759 bss_ref_put(rdev, new);
1764 if (rdev->bss_entries >= bss_entries_limit &&
1765 !cfg80211_bss_expire_oldest(rdev)) {
1766 bss_ref_put(rdev, new);
1770 /* This must be before the call to bss_ref_get */
1771 if (tmp->pub.transmitted_bss) {
1772 struct cfg80211_internal_bss *pbss =
1773 container_of(tmp->pub.transmitted_bss,
1774 struct cfg80211_internal_bss,
1777 new->pub.transmitted_bss = tmp->pub.transmitted_bss;
1778 bss_ref_get(rdev, pbss);
1781 list_add_tail(&new->list, &rdev->bss_list);
1782 rdev->bss_entries++;
1783 rb_insert_bss(rdev, new);
1787 rdev->bss_generation++;
1788 bss_ref_get(rdev, found);
1789 spin_unlock_bh(&rdev->bss_lock);
1793 spin_unlock_bh(&rdev->bss_lock);
1797 int cfg80211_get_ies_channel_number(const u8 *ie, size_t ielen,
1798 enum nl80211_band band)
1801 int channel_number = -1;
1803 if (band == NL80211_BAND_S1GHZ) {
1804 tmp = cfg80211_find_ie(WLAN_EID_S1G_OPERATION, ie, ielen);
1805 if (tmp && tmp[1] >= sizeof(struct ieee80211_s1g_oper_ie)) {
1806 struct ieee80211_s1g_oper_ie *s1gop = (void *)(tmp + 2);
1808 channel_number = s1gop->primary_ch;
1811 tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen);
1812 if (tmp && tmp[1] == 1) {
1813 channel_number = tmp[2];
1815 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen);
1816 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) {
1817 struct ieee80211_ht_operation *htop = (void *)(tmp + 2);
1819 channel_number = htop->primary_chan;
1824 return channel_number;
1826 EXPORT_SYMBOL(cfg80211_get_ies_channel_number);
1829 * Update RX channel information based on the available frame payload
1830 * information. This is mainly for the 2.4 GHz band where frames can be received
1831 * from neighboring channels and the Beacon frames use the DSSS Parameter Set
1832 * element to indicate the current (transmitting) channel, but this might also
1833 * be needed on other bands if RX frequency does not match with the actual
1834 * operating channel of a BSS.
1836 static struct ieee80211_channel *
1837 cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
1838 struct ieee80211_channel *channel,
1839 enum nl80211_bss_scan_width scan_width)
1843 struct ieee80211_channel *alt_channel;
1845 channel_number = cfg80211_get_ies_channel_number(ie, ielen, channel->band);
1847 if (channel_number < 0) {
1848 /* No channel information in frame payload */
1852 freq = ieee80211_channel_to_freq_khz(channel_number, channel->band);
1853 alt_channel = ieee80211_get_channel_khz(wiphy, freq);
1855 if (channel->band == NL80211_BAND_2GHZ) {
1857 * Better not allow unexpected channels when that could
1858 * be going beyond the 1-11 range (e.g., discovering
1859 * BSS on channel 12 when radio is configured for
1865 /* No match for the payload channel number - ignore it */
1869 if (scan_width == NL80211_BSS_CHAN_WIDTH_10 ||
1870 scan_width == NL80211_BSS_CHAN_WIDTH_5) {
1872 * Ignore channel number in 5 and 10 MHz channels where there
1873 * may not be an n:1 or 1:n mapping between frequencies and
1880 * Use the channel determined through the payload channel number
1881 * instead of the RX channel reported by the driver.
1883 if (alt_channel->flags & IEEE80211_CHAN_DISABLED)
1888 /* Returned bss is reference counted and must be cleaned up appropriately. */
1889 static struct cfg80211_bss *
1890 cfg80211_inform_single_bss_data(struct wiphy *wiphy,
1891 struct cfg80211_inform_bss *data,
1892 enum cfg80211_bss_frame_type ftype,
1893 const u8 *bssid, u64 tsf, u16 capability,
1894 u16 beacon_interval, const u8 *ie, size_t ielen,
1895 struct cfg80211_non_tx_bss *non_tx_data,
1898 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1899 struct cfg80211_bss_ies *ies;
1900 struct ieee80211_channel *channel;
1901 struct cfg80211_internal_bss tmp = {}, *res;
1906 if (WARN_ON(!wiphy))
1909 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
1910 (data->signal < 0 || data->signal > 100)))
1913 channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan,
1918 memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
1919 tmp.pub.channel = channel;
1920 tmp.pub.scan_width = data->scan_width;
1921 tmp.pub.signal = data->signal;
1922 tmp.pub.beacon_interval = beacon_interval;
1923 tmp.pub.capability = capability;
1924 tmp.ts_boottime = data->boottime_ns;
1925 tmp.parent_tsf = data->parent_tsf;
1926 ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
1929 tmp.pub.transmitted_bss = non_tx_data->tx_bss;
1930 ts = bss_from_pub(non_tx_data->tx_bss)->ts;
1931 tmp.pub.bssid_index = non_tx_data->bssid_index;
1932 tmp.pub.max_bssid_indicator = non_tx_data->max_bssid_indicator;
1938 * If we do not know here whether the IEs are from a Beacon or Probe
1939 * Response frame, we need to pick one of the options and only use it
1940 * with the driver that does not provide the full Beacon/Probe Response
1941 * frame. Use Beacon frame pointer to avoid indicating that this should
1942 * override the IEs pointer should we have received an earlier
1943 * indication of Probe Response data.
1945 ies = kzalloc(sizeof(*ies) + ielen, gfp);
1950 ies->from_beacon = false;
1951 memcpy(ies->data, ie, ielen);
1954 case CFG80211_BSS_FTYPE_BEACON:
1955 ies->from_beacon = true;
1957 case CFG80211_BSS_FTYPE_UNKNOWN:
1958 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1960 case CFG80211_BSS_FTYPE_PRESP:
1961 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1964 rcu_assign_pointer(tmp.pub.ies, ies);
1966 signal_valid = data->chan == channel;
1967 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid, ts);
1971 if (channel->band == NL80211_BAND_60GHZ) {
1972 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1973 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1974 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1975 regulatory_hint_found_beacon(wiphy, channel, gfp);
1977 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1978 regulatory_hint_found_beacon(wiphy, channel, gfp);
1982 /* this is a nontransmitting bss, we need to add it to
1983 * transmitting bss' list if it is not there
1985 if (cfg80211_add_nontrans_list(non_tx_data->tx_bss,
1987 if (__cfg80211_unlink_bss(rdev, res))
1988 rdev->bss_generation++;
1992 trace_cfg80211_return_bss(&res->pub);
1993 /* cfg80211_bss_update gives us a referenced result */
1997 static const struct element
1998 *cfg80211_get_profile_continuation(const u8 *ie, size_t ielen,
1999 const struct element *mbssid_elem,
2000 const struct element *sub_elem)
2002 const u8 *mbssid_end = mbssid_elem->data + mbssid_elem->datalen;
2003 const struct element *next_mbssid;
2004 const struct element *next_sub;
2006 next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID,
2008 ielen - (mbssid_end - ie));
2011 * If it is not the last subelement in current MBSSID IE or there isn't
2012 * a next MBSSID IE - profile is complete.
2014 if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) ||
2018 /* For any length error, just return NULL */
2020 if (next_mbssid->datalen < 4)
2023 next_sub = (void *)&next_mbssid->data[1];
2025 if (next_mbssid->data + next_mbssid->datalen <
2026 next_sub->data + next_sub->datalen)
2029 if (next_sub->id != 0 || next_sub->datalen < 2)
2033 * Check if the first element in the next sub element is a start
2036 return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ?
2040 size_t cfg80211_merge_profile(const u8 *ie, size_t ielen,
2041 const struct element *mbssid_elem,
2042 const struct element *sub_elem,
2043 u8 *merged_ie, size_t max_copy_len)
2045 size_t copied_len = sub_elem->datalen;
2046 const struct element *next_mbssid;
2048 if (sub_elem->datalen > max_copy_len)
2051 memcpy(merged_ie, sub_elem->data, sub_elem->datalen);
2053 while ((next_mbssid = cfg80211_get_profile_continuation(ie, ielen,
2056 const struct element *next_sub = (void *)&next_mbssid->data[1];
2058 if (copied_len + next_sub->datalen > max_copy_len)
2060 memcpy(merged_ie + copied_len, next_sub->data,
2062 copied_len += next_sub->datalen;
2067 EXPORT_SYMBOL(cfg80211_merge_profile);
2069 static void cfg80211_parse_mbssid_data(struct wiphy *wiphy,
2070 struct cfg80211_inform_bss *data,
2071 enum cfg80211_bss_frame_type ftype,
2072 const u8 *bssid, u64 tsf,
2073 u16 beacon_interval, const u8 *ie,
2075 struct cfg80211_non_tx_bss *non_tx_data,
2078 const u8 *mbssid_index_ie;
2079 const struct element *elem, *sub;
2081 u8 new_bssid[ETH_ALEN];
2082 u8 *new_ie, *profile;
2083 u64 seen_indices = 0;
2085 struct cfg80211_bss *bss;
2089 if (!cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
2091 if (!wiphy->support_mbssid)
2093 if (wiphy->support_only_he_mbssid &&
2094 !cfg80211_find_ext_elem(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
2097 new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp);
2101 profile = kmalloc(ielen, gfp);
2105 for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, ie, ielen) {
2106 if (elem->datalen < 4)
2108 for_each_element(sub, elem->data + 1, elem->datalen - 1) {
2111 if (sub->id != 0 || sub->datalen < 4) {
2112 /* not a valid BSS profile */
2116 if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP ||
2117 sub->data[1] != 2) {
2118 /* The first element within the Nontransmitted
2119 * BSSID Profile is not the Nontransmitted
2120 * BSSID Capability element.
2125 memset(profile, 0, ielen);
2126 profile_len = cfg80211_merge_profile(ie, ielen,
2132 /* found a Nontransmitted BSSID Profile */
2133 mbssid_index_ie = cfg80211_find_ie
2134 (WLAN_EID_MULTI_BSSID_IDX,
2135 profile, profile_len);
2136 if (!mbssid_index_ie || mbssid_index_ie[1] < 1 ||
2137 mbssid_index_ie[2] == 0 ||
2138 mbssid_index_ie[2] > 46) {
2139 /* No valid Multiple BSSID-Index element */
2143 if (seen_indices & BIT_ULL(mbssid_index_ie[2]))
2144 /* We don't support legacy split of a profile */
2145 net_dbg_ratelimited("Partial info for BSSID index %d\n",
2146 mbssid_index_ie[2]);
2148 seen_indices |= BIT_ULL(mbssid_index_ie[2]);
2150 non_tx_data->bssid_index = mbssid_index_ie[2];
2151 non_tx_data->max_bssid_indicator = elem->data[0];
2153 cfg80211_gen_new_bssid(bssid,
2154 non_tx_data->max_bssid_indicator,
2155 non_tx_data->bssid_index,
2157 memset(new_ie, 0, IEEE80211_MAX_DATA_LEN);
2158 new_ie_len = cfg80211_gen_new_ie(ie, ielen,
2160 profile_len, new_ie,
2165 capability = get_unaligned_le16(profile + 2);
2166 bss = cfg80211_inform_single_bss_data(wiphy, data,
2177 cfg80211_put_bss(wiphy, bss);
2186 struct cfg80211_bss *
2187 cfg80211_inform_bss_data(struct wiphy *wiphy,
2188 struct cfg80211_inform_bss *data,
2189 enum cfg80211_bss_frame_type ftype,
2190 const u8 *bssid, u64 tsf, u16 capability,
2191 u16 beacon_interval, const u8 *ie, size_t ielen,
2194 struct cfg80211_bss *res;
2195 struct cfg80211_non_tx_bss non_tx_data;
2197 res = cfg80211_inform_single_bss_data(wiphy, data, ftype, bssid, tsf,
2198 capability, beacon_interval, ie,
2202 non_tx_data.tx_bss = res;
2203 cfg80211_parse_mbssid_data(wiphy, data, ftype, bssid, tsf,
2204 beacon_interval, ie, ielen, &non_tx_data,
2208 EXPORT_SYMBOL(cfg80211_inform_bss_data);
2211 cfg80211_parse_mbssid_frame_data(struct wiphy *wiphy,
2212 struct cfg80211_inform_bss *data,
2213 struct ieee80211_mgmt *mgmt, size_t len,
2214 struct cfg80211_non_tx_bss *non_tx_data,
2217 enum cfg80211_bss_frame_type ftype;
2218 const u8 *ie = mgmt->u.probe_resp.variable;
2219 size_t ielen = len - offsetof(struct ieee80211_mgmt,
2220 u.probe_resp.variable);
2222 ftype = ieee80211_is_beacon(mgmt->frame_control) ?
2223 CFG80211_BSS_FTYPE_BEACON : CFG80211_BSS_FTYPE_PRESP;
2225 cfg80211_parse_mbssid_data(wiphy, data, ftype, mgmt->bssid,
2226 le64_to_cpu(mgmt->u.probe_resp.timestamp),
2227 le16_to_cpu(mgmt->u.probe_resp.beacon_int),
2228 ie, ielen, non_tx_data, gfp);
2232 cfg80211_update_notlisted_nontrans(struct wiphy *wiphy,
2233 struct cfg80211_bss *nontrans_bss,
2234 struct ieee80211_mgmt *mgmt, size_t len)
2236 u8 *ie, *new_ie, *pos;
2237 const u8 *nontrans_ssid, *trans_ssid, *mbssid;
2238 size_t ielen = len - offsetof(struct ieee80211_mgmt,
2239 u.probe_resp.variable);
2241 struct cfg80211_bss_ies *new_ies;
2242 const struct cfg80211_bss_ies *old;
2245 lockdep_assert_held(&wiphy_to_rdev(wiphy)->bss_lock);
2247 ie = mgmt->u.probe_resp.variable;
2250 trans_ssid = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
2253 new_ie_len -= trans_ssid[1];
2254 mbssid = cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen);
2256 * It's not valid to have the MBSSID element before SSID
2257 * ignore if that happens - the code below assumes it is
2258 * after (while copying things inbetween).
2260 if (!mbssid || mbssid < trans_ssid)
2262 new_ie_len -= mbssid[1];
2264 nontrans_ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
2268 new_ie_len += nontrans_ssid[1];
2270 /* generate new ie for nontrans BSS
2271 * 1. replace SSID with nontrans BSS' SSID
2274 new_ie = kzalloc(new_ie_len, GFP_ATOMIC);
2278 new_ies = kzalloc(sizeof(*new_ies) + new_ie_len, GFP_ATOMIC);
2284 /* copy the nontransmitted SSID */
2285 cpy_len = nontrans_ssid[1] + 2;
2286 memcpy(pos, nontrans_ssid, cpy_len);
2288 /* copy the IEs between SSID and MBSSID */
2289 cpy_len = trans_ssid[1] + 2;
2290 memcpy(pos, (trans_ssid + cpy_len), (mbssid - (trans_ssid + cpy_len)));
2291 pos += (mbssid - (trans_ssid + cpy_len));
2292 /* copy the IEs after MBSSID */
2293 cpy_len = mbssid[1] + 2;
2294 memcpy(pos, mbssid + cpy_len, ((ie + ielen) - (mbssid + cpy_len)));
2297 new_ies->len = new_ie_len;
2298 new_ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
2299 new_ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
2300 memcpy(new_ies->data, new_ie, new_ie_len);
2301 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
2302 old = rcu_access_pointer(nontrans_bss->proberesp_ies);
2303 rcu_assign_pointer(nontrans_bss->proberesp_ies, new_ies);
2304 rcu_assign_pointer(nontrans_bss->ies, new_ies);
2306 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
2308 old = rcu_access_pointer(nontrans_bss->beacon_ies);
2309 rcu_assign_pointer(nontrans_bss->beacon_ies, new_ies);
2310 rcu_assign_pointer(nontrans_bss->ies, new_ies);
2312 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
2319 /* cfg80211_inform_bss_width_frame helper */
2320 static struct cfg80211_bss *
2321 cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
2322 struct cfg80211_inform_bss *data,
2323 struct ieee80211_mgmt *mgmt, size_t len,
2326 struct cfg80211_internal_bss tmp = {}, *res;
2327 struct cfg80211_bss_ies *ies;
2328 struct ieee80211_channel *channel;
2330 struct ieee80211_ext *ext = NULL;
2331 u8 *bssid, *variable;
2332 u16 capability, beacon_int;
2333 size_t ielen, min_hdr_len = offsetof(struct ieee80211_mgmt,
2334 u.probe_resp.variable);
2337 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
2338 offsetof(struct ieee80211_mgmt, u.beacon.variable));
2340 trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len);
2345 if (WARN_ON(!wiphy))
2348 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
2349 (data->signal < 0 || data->signal > 100)))
2352 if (ieee80211_is_s1g_beacon(mgmt->frame_control)) {
2353 ext = (void *) mgmt;
2354 min_hdr_len = offsetof(struct ieee80211_ext, u.s1g_beacon);
2355 if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
2356 min_hdr_len = offsetof(struct ieee80211_ext,
2357 u.s1g_short_beacon.variable);
2360 if (WARN_ON(len < min_hdr_len))
2363 ielen = len - min_hdr_len;
2364 variable = mgmt->u.probe_resp.variable;
2366 if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
2367 variable = ext->u.s1g_short_beacon.variable;
2369 variable = ext->u.s1g_beacon.variable;
2372 channel = cfg80211_get_bss_channel(wiphy, variable,
2373 ielen, data->chan, data->scan_width);
2378 const struct ieee80211_s1g_bcn_compat_ie *compat;
2379 const struct element *elem;
2381 elem = cfg80211_find_elem(WLAN_EID_S1G_BCN_COMPAT,
2385 if (elem->datalen < sizeof(*compat))
2387 compat = (void *)elem->data;
2388 bssid = ext->u.s1g_beacon.sa;
2389 capability = le16_to_cpu(compat->compat_info);
2390 beacon_int = le16_to_cpu(compat->beacon_int);
2392 bssid = mgmt->bssid;
2393 beacon_int = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
2394 capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
2397 ies = kzalloc(sizeof(*ies) + ielen, gfp);
2401 ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
2402 ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control) ||
2403 ieee80211_is_s1g_beacon(mgmt->frame_control);
2404 memcpy(ies->data, variable, ielen);
2406 if (ieee80211_is_probe_resp(mgmt->frame_control))
2407 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
2409 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
2410 rcu_assign_pointer(tmp.pub.ies, ies);
2412 memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
2413 tmp.pub.beacon_interval = beacon_int;
2414 tmp.pub.capability = capability;
2415 tmp.pub.channel = channel;
2416 tmp.pub.scan_width = data->scan_width;
2417 tmp.pub.signal = data->signal;
2418 tmp.ts_boottime = data->boottime_ns;
2419 tmp.parent_tsf = data->parent_tsf;
2420 tmp.pub.chains = data->chains;
2421 memcpy(tmp.pub.chain_signal, data->chain_signal, IEEE80211_MAX_CHAINS);
2422 ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
2424 signal_valid = data->chan == channel;
2425 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid,
2430 if (channel->band == NL80211_BAND_60GHZ) {
2431 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
2432 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
2433 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
2434 regulatory_hint_found_beacon(wiphy, channel, gfp);
2436 if (res->pub.capability & WLAN_CAPABILITY_ESS)
2437 regulatory_hint_found_beacon(wiphy, channel, gfp);
2440 trace_cfg80211_return_bss(&res->pub);
2441 /* cfg80211_bss_update gives us a referenced result */
2445 struct cfg80211_bss *
2446 cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
2447 struct cfg80211_inform_bss *data,
2448 struct ieee80211_mgmt *mgmt, size_t len,
2451 struct cfg80211_bss *res, *tmp_bss;
2452 const u8 *ie = mgmt->u.probe_resp.variable;
2453 const struct cfg80211_bss_ies *ies1, *ies2;
2454 size_t ielen = len - offsetof(struct ieee80211_mgmt,
2455 u.probe_resp.variable);
2456 struct cfg80211_non_tx_bss non_tx_data;
2458 res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt,
2460 if (!res || !wiphy->support_mbssid ||
2461 !cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
2463 if (wiphy->support_only_he_mbssid &&
2464 !cfg80211_find_ext_elem(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
2467 non_tx_data.tx_bss = res;
2468 /* process each non-transmitting bss */
2469 cfg80211_parse_mbssid_frame_data(wiphy, data, mgmt, len,
2472 spin_lock_bh(&wiphy_to_rdev(wiphy)->bss_lock);
2474 /* check if the res has other nontransmitting bss which is not
2477 ies1 = rcu_access_pointer(res->ies);
2479 /* go through nontrans_list, if the timestamp of the BSS is
2480 * earlier than the timestamp of the transmitting BSS then
2483 list_for_each_entry(tmp_bss, &res->nontrans_list,
2485 ies2 = rcu_access_pointer(tmp_bss->ies);
2486 if (ies2->tsf < ies1->tsf)
2487 cfg80211_update_notlisted_nontrans(wiphy, tmp_bss,
2490 spin_unlock_bh(&wiphy_to_rdev(wiphy)->bss_lock);
2494 EXPORT_SYMBOL(cfg80211_inform_bss_frame_data);
2496 void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
2498 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2499 struct cfg80211_internal_bss *bss;
2504 bss = container_of(pub, struct cfg80211_internal_bss, pub);
2506 spin_lock_bh(&rdev->bss_lock);
2507 bss_ref_get(rdev, bss);
2508 spin_unlock_bh(&rdev->bss_lock);
2510 EXPORT_SYMBOL(cfg80211_ref_bss);
2512 void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
2514 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2515 struct cfg80211_internal_bss *bss;
2520 bss = container_of(pub, struct cfg80211_internal_bss, pub);
2522 spin_lock_bh(&rdev->bss_lock);
2523 bss_ref_put(rdev, bss);
2524 spin_unlock_bh(&rdev->bss_lock);
2526 EXPORT_SYMBOL(cfg80211_put_bss);
2528 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
2530 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2531 struct cfg80211_internal_bss *bss, *tmp1;
2532 struct cfg80211_bss *nontrans_bss, *tmp;
2537 bss = container_of(pub, struct cfg80211_internal_bss, pub);
2539 spin_lock_bh(&rdev->bss_lock);
2540 if (list_empty(&bss->list))
2543 list_for_each_entry_safe(nontrans_bss, tmp,
2544 &pub->nontrans_list,
2546 tmp1 = container_of(nontrans_bss,
2547 struct cfg80211_internal_bss, pub);
2548 if (__cfg80211_unlink_bss(rdev, tmp1))
2549 rdev->bss_generation++;
2552 if (__cfg80211_unlink_bss(rdev, bss))
2553 rdev->bss_generation++;
2555 spin_unlock_bh(&rdev->bss_lock);
2557 EXPORT_SYMBOL(cfg80211_unlink_bss);
2559 void cfg80211_bss_iter(struct wiphy *wiphy,
2560 struct cfg80211_chan_def *chandef,
2561 void (*iter)(struct wiphy *wiphy,
2562 struct cfg80211_bss *bss,
2566 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2567 struct cfg80211_internal_bss *bss;
2569 spin_lock_bh(&rdev->bss_lock);
2571 list_for_each_entry(bss, &rdev->bss_list, list) {
2572 if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel))
2573 iter(wiphy, &bss->pub, iter_data);
2576 spin_unlock_bh(&rdev->bss_lock);
2578 EXPORT_SYMBOL(cfg80211_bss_iter);
2580 void cfg80211_update_assoc_bss_entry(struct wireless_dev *wdev,
2581 struct ieee80211_channel *chan)
2583 struct wiphy *wiphy = wdev->wiphy;
2584 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2585 struct cfg80211_internal_bss *cbss = wdev->current_bss;
2586 struct cfg80211_internal_bss *new = NULL;
2587 struct cfg80211_internal_bss *bss;
2588 struct cfg80211_bss *nontrans_bss;
2589 struct cfg80211_bss *tmp;
2591 spin_lock_bh(&rdev->bss_lock);
2594 * Some APs use CSA also for bandwidth changes, i.e., without actually
2595 * changing the control channel, so no need to update in such a case.
2597 if (cbss->pub.channel == chan)
2600 /* use transmitting bss */
2601 if (cbss->pub.transmitted_bss)
2602 cbss = container_of(cbss->pub.transmitted_bss,
2603 struct cfg80211_internal_bss,
2606 cbss->pub.channel = chan;
2608 list_for_each_entry(bss, &rdev->bss_list, list) {
2609 if (!cfg80211_bss_type_match(bss->pub.capability,
2610 bss->pub.channel->band,
2611 wdev->conn_bss_type))
2617 if (!cmp_bss(&bss->pub, &cbss->pub, BSS_CMP_REGULAR)) {
2624 /* to save time, update IEs for transmitting bss only */
2625 if (cfg80211_update_known_bss(rdev, cbss, new, false)) {
2626 new->pub.proberesp_ies = NULL;
2627 new->pub.beacon_ies = NULL;
2630 list_for_each_entry_safe(nontrans_bss, tmp,
2631 &new->pub.nontrans_list,
2633 bss = container_of(nontrans_bss,
2634 struct cfg80211_internal_bss, pub);
2635 if (__cfg80211_unlink_bss(rdev, bss))
2636 rdev->bss_generation++;
2639 WARN_ON(atomic_read(&new->hold));
2640 if (!WARN_ON(!__cfg80211_unlink_bss(rdev, new)))
2641 rdev->bss_generation++;
2644 rb_erase(&cbss->rbn, &rdev->bss_tree);
2645 rb_insert_bss(rdev, cbss);
2646 rdev->bss_generation++;
2648 list_for_each_entry_safe(nontrans_bss, tmp,
2649 &cbss->pub.nontrans_list,
2651 bss = container_of(nontrans_bss,
2652 struct cfg80211_internal_bss, pub);
2653 bss->pub.channel = chan;
2654 rb_erase(&bss->rbn, &rdev->bss_tree);
2655 rb_insert_bss(rdev, bss);
2656 rdev->bss_generation++;
2660 spin_unlock_bh(&rdev->bss_lock);
2663 #ifdef CONFIG_CFG80211_WEXT
2664 static struct cfg80211_registered_device *
2665 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
2667 struct cfg80211_registered_device *rdev;
2668 struct net_device *dev;
2672 dev = dev_get_by_index(net, ifindex);
2674 return ERR_PTR(-ENODEV);
2675 if (dev->ieee80211_ptr)
2676 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
2678 rdev = ERR_PTR(-ENODEV);
2683 int cfg80211_wext_siwscan(struct net_device *dev,
2684 struct iw_request_info *info,
2685 union iwreq_data *wrqu, char *extra)
2687 struct cfg80211_registered_device *rdev;
2688 struct wiphy *wiphy;
2689 struct iw_scan_req *wreq = NULL;
2690 struct cfg80211_scan_request *creq = NULL;
2691 int i, err, n_channels = 0;
2692 enum nl80211_band band;
2694 if (!netif_running(dev))
2697 if (wrqu->data.length == sizeof(struct iw_scan_req))
2698 wreq = (struct iw_scan_req *)extra;
2700 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2703 return PTR_ERR(rdev);
2705 if (rdev->scan_req || rdev->scan_msg) {
2710 wiphy = &rdev->wiphy;
2712 /* Determine number of channels, needed to allocate creq */
2713 if (wreq && wreq->num_channels)
2714 n_channels = wreq->num_channels;
2716 n_channels = ieee80211_get_num_supported_channels(wiphy);
2718 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
2719 n_channels * sizeof(void *),
2726 creq->wiphy = wiphy;
2727 creq->wdev = dev->ieee80211_ptr;
2728 /* SSIDs come after channels */
2729 creq->ssids = (void *)&creq->channels[n_channels];
2730 creq->n_channels = n_channels;
2732 creq->scan_start = jiffies;
2734 /* translate "Scan on frequencies" request */
2736 for (band = 0; band < NUM_NL80211_BANDS; band++) {
2739 if (!wiphy->bands[band])
2742 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
2743 /* ignore disabled channels */
2744 if (wiphy->bands[band]->channels[j].flags &
2745 IEEE80211_CHAN_DISABLED)
2748 /* If we have a wireless request structure and the
2749 * wireless request specifies frequencies, then search
2750 * for the matching hardware channel.
2752 if (wreq && wreq->num_channels) {
2754 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
2755 for (k = 0; k < wreq->num_channels; k++) {
2756 struct iw_freq *freq =
2757 &wreq->channel_list[k];
2759 cfg80211_wext_freq(freq);
2761 if (wext_freq == wiphy_freq)
2762 goto wext_freq_found;
2764 goto wext_freq_not_found;
2768 creq->channels[i] = &wiphy->bands[band]->channels[j];
2770 wext_freq_not_found: ;
2773 /* No channels found? */
2779 /* Set real number of channels specified in creq->channels[] */
2780 creq->n_channels = i;
2782 /* translate "Scan for SSID" request */
2784 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
2785 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
2789 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
2790 creq->ssids[0].ssid_len = wreq->essid_len;
2792 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
2796 for (i = 0; i < NUM_NL80211_BANDS; i++)
2797 if (wiphy->bands[i])
2798 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
2800 eth_broadcast_addr(creq->bssid);
2802 wiphy_lock(&rdev->wiphy);
2804 rdev->scan_req = creq;
2805 err = rdev_scan(rdev, creq);
2807 rdev->scan_req = NULL;
2808 /* creq will be freed below */
2810 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
2811 /* creq now owned by driver */
2815 wiphy_unlock(&rdev->wiphy);
2820 EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
2822 static char *ieee80211_scan_add_ies(struct iw_request_info *info,
2823 const struct cfg80211_bss_ies *ies,
2824 char *current_ev, char *end_buf)
2826 const u8 *pos, *end, *next;
2827 struct iw_event iwe;
2833 * If needed, fragment the IEs buffer (at IE boundaries) into short
2834 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
2837 end = pos + ies->len;
2839 while (end - pos > IW_GENERIC_IE_MAX) {
2840 next = pos + 2 + pos[1];
2841 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
2842 next = next + 2 + next[1];
2844 memset(&iwe, 0, sizeof(iwe));
2845 iwe.cmd = IWEVGENIE;
2846 iwe.u.data.length = next - pos;
2847 current_ev = iwe_stream_add_point_check(info, current_ev,
2850 if (IS_ERR(current_ev))
2856 memset(&iwe, 0, sizeof(iwe));
2857 iwe.cmd = IWEVGENIE;
2858 iwe.u.data.length = end - pos;
2859 current_ev = iwe_stream_add_point_check(info, current_ev,
2862 if (IS_ERR(current_ev))
2870 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
2871 struct cfg80211_internal_bss *bss, char *current_ev,
2874 const struct cfg80211_bss_ies *ies;
2875 struct iw_event iwe;
2880 bool ismesh = false;
2882 memset(&iwe, 0, sizeof(iwe));
2883 iwe.cmd = SIOCGIWAP;
2884 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
2885 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
2886 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2888 if (IS_ERR(current_ev))
2891 memset(&iwe, 0, sizeof(iwe));
2892 iwe.cmd = SIOCGIWFREQ;
2893 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
2895 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2897 if (IS_ERR(current_ev))
2900 memset(&iwe, 0, sizeof(iwe));
2901 iwe.cmd = SIOCGIWFREQ;
2902 iwe.u.freq.m = bss->pub.channel->center_freq;
2904 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2906 if (IS_ERR(current_ev))
2909 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
2910 memset(&iwe, 0, sizeof(iwe));
2912 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
2913 IW_QUAL_NOISE_INVALID |
2914 IW_QUAL_QUAL_UPDATED;
2915 switch (wiphy->signal_type) {
2916 case CFG80211_SIGNAL_TYPE_MBM:
2917 sig = bss->pub.signal / 100;
2918 iwe.u.qual.level = sig;
2919 iwe.u.qual.updated |= IW_QUAL_DBM;
2920 if (sig < -110) /* rather bad */
2922 else if (sig > -40) /* perfect */
2924 /* will give a range of 0 .. 70 */
2925 iwe.u.qual.qual = sig + 110;
2927 case CFG80211_SIGNAL_TYPE_UNSPEC:
2928 iwe.u.qual.level = bss->pub.signal;
2929 /* will give range 0 .. 100 */
2930 iwe.u.qual.qual = bss->pub.signal;
2936 current_ev = iwe_stream_add_event_check(info, current_ev,
2939 if (IS_ERR(current_ev))
2943 memset(&iwe, 0, sizeof(iwe));
2944 iwe.cmd = SIOCGIWENCODE;
2945 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
2946 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
2948 iwe.u.data.flags = IW_ENCODE_DISABLED;
2949 iwe.u.data.length = 0;
2950 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
2952 if (IS_ERR(current_ev))
2956 ies = rcu_dereference(bss->pub.ies);
2962 if (ie[1] > rem - 2)
2967 memset(&iwe, 0, sizeof(iwe));
2968 iwe.cmd = SIOCGIWESSID;
2969 iwe.u.data.length = ie[1];
2970 iwe.u.data.flags = 1;
2971 current_ev = iwe_stream_add_point_check(info,
2975 if (IS_ERR(current_ev))
2978 case WLAN_EID_MESH_ID:
2979 memset(&iwe, 0, sizeof(iwe));
2980 iwe.cmd = SIOCGIWESSID;
2981 iwe.u.data.length = ie[1];
2982 iwe.u.data.flags = 1;
2983 current_ev = iwe_stream_add_point_check(info,
2987 if (IS_ERR(current_ev))
2990 case WLAN_EID_MESH_CONFIG:
2992 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
2995 memset(&iwe, 0, sizeof(iwe));
2996 iwe.cmd = IWEVCUSTOM;
2997 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
2999 iwe.u.data.length = strlen(buf);
3000 current_ev = iwe_stream_add_point_check(info,
3004 if (IS_ERR(current_ev))
3006 sprintf(buf, "Path Selection Metric ID: 0x%02X",
3008 iwe.u.data.length = strlen(buf);
3009 current_ev = iwe_stream_add_point_check(info,
3013 if (IS_ERR(current_ev))
3015 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
3017 iwe.u.data.length = strlen(buf);
3018 current_ev = iwe_stream_add_point_check(info,
3022 if (IS_ERR(current_ev))
3024 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
3025 iwe.u.data.length = strlen(buf);
3026 current_ev = iwe_stream_add_point_check(info,
3030 if (IS_ERR(current_ev))
3032 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
3033 iwe.u.data.length = strlen(buf);
3034 current_ev = iwe_stream_add_point_check(info,
3038 if (IS_ERR(current_ev))
3040 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
3041 iwe.u.data.length = strlen(buf);
3042 current_ev = iwe_stream_add_point_check(info,
3046 if (IS_ERR(current_ev))
3048 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
3049 iwe.u.data.length = strlen(buf);
3050 current_ev = iwe_stream_add_point_check(info,
3054 if (IS_ERR(current_ev))
3057 case WLAN_EID_SUPP_RATES:
3058 case WLAN_EID_EXT_SUPP_RATES:
3059 /* display all supported rates in readable format */
3060 p = current_ev + iwe_stream_lcp_len(info);
3062 memset(&iwe, 0, sizeof(iwe));
3063 iwe.cmd = SIOCGIWRATE;
3064 /* Those two flags are ignored... */
3065 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
3067 for (i = 0; i < ie[1]; i++) {
3068 iwe.u.bitrate.value =
3069 ((ie[i + 2] & 0x7f) * 500000);
3071 p = iwe_stream_add_value(info, current_ev, p,
3075 current_ev = ERR_PTR(-E2BIG);
3086 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
3088 memset(&iwe, 0, sizeof(iwe));
3089 iwe.cmd = SIOCGIWMODE;
3091 iwe.u.mode = IW_MODE_MESH;
3092 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
3093 iwe.u.mode = IW_MODE_MASTER;
3095 iwe.u.mode = IW_MODE_ADHOC;
3096 current_ev = iwe_stream_add_event_check(info, current_ev,
3099 if (IS_ERR(current_ev))
3103 memset(&iwe, 0, sizeof(iwe));
3104 iwe.cmd = IWEVCUSTOM;
3105 sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
3106 iwe.u.data.length = strlen(buf);
3107 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
3109 if (IS_ERR(current_ev))
3111 memset(&iwe, 0, sizeof(iwe));
3112 iwe.cmd = IWEVCUSTOM;
3113 sprintf(buf, " Last beacon: %ums ago",
3114 elapsed_jiffies_msecs(bss->ts));
3115 iwe.u.data.length = strlen(buf);
3116 current_ev = iwe_stream_add_point_check(info, current_ev,
3117 end_buf, &iwe, buf);
3118 if (IS_ERR(current_ev))
3121 current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
3129 static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
3130 struct iw_request_info *info,
3131 char *buf, size_t len)
3133 char *current_ev = buf;
3134 char *end_buf = buf + len;
3135 struct cfg80211_internal_bss *bss;
3138 spin_lock_bh(&rdev->bss_lock);
3139 cfg80211_bss_expire(rdev);
3141 list_for_each_entry(bss, &rdev->bss_list, list) {
3142 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
3146 current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
3147 current_ev, end_buf);
3148 if (IS_ERR(current_ev)) {
3149 err = PTR_ERR(current_ev);
3153 spin_unlock_bh(&rdev->bss_lock);
3157 return current_ev - buf;
3161 int cfg80211_wext_giwscan(struct net_device *dev,
3162 struct iw_request_info *info,
3163 struct iw_point *data, char *extra)
3165 struct cfg80211_registered_device *rdev;
3168 if (!netif_running(dev))
3171 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
3174 return PTR_ERR(rdev);
3176 if (rdev->scan_req || rdev->scan_msg)
3179 res = ieee80211_scan_results(rdev, info, extra, data->length);
3188 EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan);