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) 2018-2023 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>
23 #include <kunit/visibility.h>
26 #include "wext-compat.h"
30 * DOC: BSS tree/list structure
32 * At the top level, the BSS list is kept in both a list in each
33 * registered device (@bss_list) as well as an RB-tree for faster
34 * lookup. In the RB-tree, entries can be looked up using their
35 * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID
38 * Due to the possibility of hidden SSIDs, there's a second level
39 * structure, the "hidden_list" and "hidden_beacon_bss" pointer.
40 * The hidden_list connects all BSSes belonging to a single AP
41 * that has a hidden SSID, and connects beacon and probe response
42 * entries. For a probe response entry for a hidden SSID, the
43 * hidden_beacon_bss pointer points to the BSS struct holding the
44 * beacon's information.
46 * Reference counting is done for all these references except for
47 * the hidden_list, so that a beacon BSS struct that is otherwise
48 * not referenced has one reference for being on the bss_list and
49 * one for each probe response entry that points to it using the
50 * hidden_beacon_bss pointer. When a BSS struct that has such a
51 * pointer is get/put, the refcount update is also propagated to
52 * the referenced struct, this ensure that it cannot get removed
53 * while somebody is using the probe response version.
55 * Note that the hidden_beacon_bss pointer never changes, due to
56 * the reference counting. Therefore, no locking is needed for
59 * Also note that the hidden_beacon_bss pointer is only relevant
60 * if the driver uses something other than the IEs, e.g. private
61 * data stored in the BSS struct, since the beacon IEs are
62 * also linked into the probe response struct.
66 * Limit the number of BSS entries stored in mac80211. Each one is
67 * a bit over 4k at most, so this limits to roughly 4-5M of memory.
68 * If somebody wants to really attack this though, they'd likely
69 * use small beacons, and only one type of frame, limiting each of
70 * the entries to a much smaller size (in order to generate more
71 * entries in total, so overhead is bigger.)
73 static int bss_entries_limit = 1000;
74 module_param(bss_entries_limit, int, 0644);
75 MODULE_PARM_DESC(bss_entries_limit,
76 "limit to number of scan BSS entries (per wiphy, default 1000)");
78 #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ)
81 * struct cfg80211_colocated_ap - colocated AP information
83 * @list: linked list to all colocated aPS
84 * @bssid: BSSID of the reported AP
85 * @ssid: SSID of the reported AP
86 * @ssid_len: length of the ssid
87 * @center_freq: frequency the reported AP is on
88 * @unsolicited_probe: the reported AP is part of an ESS, where all the APs
89 * that operate in the same channel as the reported AP and that might be
90 * detected by a STA receiving this frame, are transmitting unsolicited
91 * Probe Response frames every 20 TUs
92 * @oct_recommended: OCT is recommended to exchange MMPDUs with the reported AP
93 * @same_ssid: the reported AP has the same SSID as the reporting AP
94 * @multi_bss: the reported AP is part of a multiple BSSID set
95 * @transmitted_bssid: the reported AP is the transmitting BSSID
96 * @colocated_ess: all the APs that share the same ESS as the reported AP are
97 * colocated and can be discovered via legacy bands.
98 * @short_ssid_valid: short_ssid is valid and can be used
99 * @short_ssid: the short SSID for this SSID
100 * @psd_20: The 20MHz PSD EIRP of the primary 20MHz channel for the reported AP
102 struct cfg80211_colocated_ap {
103 struct list_head list;
105 u8 ssid[IEEE80211_MAX_SSID_LEN];
109 u8 unsolicited_probe:1,
119 static void bss_free(struct cfg80211_internal_bss *bss)
121 struct cfg80211_bss_ies *ies;
123 if (WARN_ON(atomic_read(&bss->hold)))
126 ies = (void *)rcu_access_pointer(bss->pub.beacon_ies);
127 if (ies && !bss->pub.hidden_beacon_bss)
128 kfree_rcu(ies, rcu_head);
129 ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies);
131 kfree_rcu(ies, rcu_head);
134 * This happens when the module is removed, it doesn't
135 * really matter any more save for completeness
137 if (!list_empty(&bss->hidden_list))
138 list_del(&bss->hidden_list);
143 static inline void bss_ref_get(struct cfg80211_registered_device *rdev,
144 struct cfg80211_internal_bss *bss)
146 lockdep_assert_held(&rdev->bss_lock);
150 if (bss->pub.hidden_beacon_bss)
151 bss_from_pub(bss->pub.hidden_beacon_bss)->refcount++;
153 if (bss->pub.transmitted_bss)
154 bss_from_pub(bss->pub.transmitted_bss)->refcount++;
157 static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
158 struct cfg80211_internal_bss *bss)
160 lockdep_assert_held(&rdev->bss_lock);
162 if (bss->pub.hidden_beacon_bss) {
163 struct cfg80211_internal_bss *hbss;
165 hbss = bss_from_pub(bss->pub.hidden_beacon_bss);
167 if (hbss->refcount == 0)
171 if (bss->pub.transmitted_bss) {
172 struct cfg80211_internal_bss *tbss;
174 tbss = bss_from_pub(bss->pub.transmitted_bss);
176 if (tbss->refcount == 0)
181 if (bss->refcount == 0)
185 static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev,
186 struct cfg80211_internal_bss *bss)
188 lockdep_assert_held(&rdev->bss_lock);
190 if (!list_empty(&bss->hidden_list)) {
192 * don't remove the beacon entry if it has
193 * probe responses associated with it
195 if (!bss->pub.hidden_beacon_bss)
198 * if it's a probe response entry break its
199 * link to the other entries in the group
201 list_del_init(&bss->hidden_list);
204 list_del_init(&bss->list);
205 list_del_init(&bss->pub.nontrans_list);
206 rb_erase(&bss->rbn, &rdev->bss_tree);
208 WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list),
209 "rdev bss entries[%d]/list[empty:%d] corruption\n",
210 rdev->bss_entries, list_empty(&rdev->bss_list));
211 bss_ref_put(rdev, bss);
215 bool cfg80211_is_element_inherited(const struct element *elem,
216 const struct element *non_inherit_elem)
218 u8 id_len, ext_id_len, i, loop_len, id;
221 if (elem->id == WLAN_EID_MULTIPLE_BSSID)
224 if (elem->id == WLAN_EID_EXTENSION && elem->datalen > 1 &&
225 elem->data[0] == WLAN_EID_EXT_EHT_MULTI_LINK)
228 if (!non_inherit_elem || non_inherit_elem->datalen < 2)
232 * non inheritance element format is:
233 * ext ID (56) | IDs list len | list | extension IDs list len | list
234 * Both lists are optional. Both lengths are mandatory.
235 * This means valid length is:
236 * elem_len = 1 (extension ID) + 2 (list len fields) + list lengths
238 id_len = non_inherit_elem->data[1];
239 if (non_inherit_elem->datalen < 3 + id_len)
242 ext_id_len = non_inherit_elem->data[2 + id_len];
243 if (non_inherit_elem->datalen < 3 + id_len + ext_id_len)
246 if (elem->id == WLAN_EID_EXTENSION) {
249 loop_len = ext_id_len;
250 list = &non_inherit_elem->data[3 + id_len];
256 list = &non_inherit_elem->data[2];
260 for (i = 0; i < loop_len; i++) {
267 EXPORT_SYMBOL(cfg80211_is_element_inherited);
269 static size_t cfg80211_copy_elem_with_frags(const struct element *elem,
270 const u8 *ie, size_t ie_len,
271 u8 **pos, u8 *buf, size_t buf_len)
273 if (WARN_ON((u8 *)elem < ie || elem->data > ie + ie_len ||
274 elem->data + elem->datalen > ie + ie_len))
277 if (elem->datalen + 2 > buf + buf_len - *pos)
280 memcpy(*pos, elem, elem->datalen + 2);
281 *pos += elem->datalen + 2;
283 /* Finish if it is not fragmented */
284 if (elem->datalen != 255)
287 ie_len = ie + ie_len - elem->data - elem->datalen;
288 ie = (const u8 *)elem->data + elem->datalen;
290 for_each_element(elem, ie, ie_len) {
291 if (elem->id != WLAN_EID_FRAGMENT)
294 if (elem->datalen + 2 > buf + buf_len - *pos)
297 memcpy(*pos, elem, elem->datalen + 2);
298 *pos += elem->datalen + 2;
300 if (elem->datalen != 255)
307 VISIBLE_IF_CFG80211_KUNIT size_t
308 cfg80211_gen_new_ie(const u8 *ie, size_t ielen,
309 const u8 *subie, size_t subie_len,
310 u8 *new_ie, size_t new_ie_len)
312 const struct element *non_inherit_elem, *parent, *sub;
315 unsigned int match_len;
317 non_inherit_elem = cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE,
320 /* We copy the elements one by one from the parent to the generated
322 * If they are not inherited (included in subie or in the non
323 * inheritance element), then we copy all occurrences the first time
324 * we see this element type.
326 for_each_element(parent, ie, ielen) {
327 if (parent->id == WLAN_EID_FRAGMENT)
330 if (parent->id == WLAN_EID_EXTENSION) {
331 if (parent->datalen < 1)
334 id = WLAN_EID_EXTENSION;
335 ext_id = parent->data[0];
342 /* Find first occurrence in subie */
343 sub = cfg80211_find_elem_match(id, subie, subie_len,
344 &ext_id, match_len, 0);
346 /* Copy from parent if not in subie and inherited */
348 cfg80211_is_element_inherited(parent, non_inherit_elem)) {
349 if (!cfg80211_copy_elem_with_frags(parent,
358 /* Already copied if an earlier element had the same type */
359 if (cfg80211_find_elem_match(id, ie, (u8 *)parent - ie,
360 &ext_id, match_len, 0))
363 /* Not inheriting, copy all similar elements from subie */
365 if (!cfg80211_copy_elem_with_frags(sub,
371 sub = cfg80211_find_elem_match(id,
372 sub->data + sub->datalen,
376 &ext_id, match_len, 0);
380 /* The above misses elements that are included in subie but not in the
381 * parent, so do a pass over subie and append those.
382 * Skip the non-tx BSSID caps and non-inheritance element.
384 for_each_element(sub, subie, subie_len) {
385 if (sub->id == WLAN_EID_NON_TX_BSSID_CAP)
388 if (sub->id == WLAN_EID_FRAGMENT)
391 if (sub->id == WLAN_EID_EXTENSION) {
392 if (sub->datalen < 1)
395 id = WLAN_EID_EXTENSION;
396 ext_id = sub->data[0];
399 if (ext_id == WLAN_EID_EXT_NON_INHERITANCE)
406 /* Processed if one was included in the parent */
407 if (cfg80211_find_elem_match(id, ie, ielen,
408 &ext_id, match_len, 0))
411 if (!cfg80211_copy_elem_with_frags(sub, subie, subie_len,
412 &pos, new_ie, new_ie_len))
418 EXPORT_SYMBOL_IF_CFG80211_KUNIT(cfg80211_gen_new_ie);
420 static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
421 const u8 *ssid, size_t ssid_len)
423 const struct cfg80211_bss_ies *ies;
424 const struct element *ssid_elem;
426 if (bssid && !ether_addr_equal(a->bssid, bssid))
432 ies = rcu_access_pointer(a->ies);
435 ssid_elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len);
438 if (ssid_elem->datalen != ssid_len)
440 return memcmp(ssid_elem->data, ssid, ssid_len) == 0;
444 cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss,
445 struct cfg80211_bss *nontrans_bss)
447 const struct element *ssid_elem;
448 struct cfg80211_bss *bss = NULL;
451 ssid_elem = ieee80211_bss_get_elem(nontrans_bss, WLAN_EID_SSID);
457 /* check if nontrans_bss is in the list */
458 list_for_each_entry(bss, &trans_bss->nontrans_list, nontrans_list) {
459 if (is_bss(bss, nontrans_bss->bssid, ssid_elem->data,
460 ssid_elem->datalen)) {
469 * This is a bit weird - it's not on the list, but already on another
470 * one! The only way that could happen is if there's some BSSID/SSID
471 * shared by multiple APs in their multi-BSSID profiles, potentially
472 * with hidden SSID mixed in ... ignore it.
474 if (!list_empty(&nontrans_bss->nontrans_list))
477 /* add to the list */
478 list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list);
482 static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev,
483 unsigned long expire_time)
485 struct cfg80211_internal_bss *bss, *tmp;
486 bool expired = false;
488 lockdep_assert_held(&rdev->bss_lock);
490 list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) {
491 if (atomic_read(&bss->hold))
493 if (!time_after(expire_time, bss->ts))
496 if (__cfg80211_unlink_bss(rdev, bss))
501 rdev->bss_generation++;
504 static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev)
506 struct cfg80211_internal_bss *bss, *oldest = NULL;
509 lockdep_assert_held(&rdev->bss_lock);
511 list_for_each_entry(bss, &rdev->bss_list, list) {
512 if (atomic_read(&bss->hold))
515 if (!list_empty(&bss->hidden_list) &&
516 !bss->pub.hidden_beacon_bss)
519 if (oldest && time_before(oldest->ts, bss->ts))
524 if (WARN_ON(!oldest))
528 * The callers make sure to increase rdev->bss_generation if anything
529 * gets removed (and a new entry added), so there's no need to also do
533 ret = __cfg80211_unlink_bss(rdev, oldest);
538 static u8 cfg80211_parse_bss_param(u8 data,
539 struct cfg80211_colocated_ap *coloc_ap)
541 coloc_ap->oct_recommended =
542 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_OCT_RECOMMENDED);
543 coloc_ap->same_ssid =
544 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_SAME_SSID);
545 coloc_ap->multi_bss =
546 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID);
547 coloc_ap->transmitted_bssid =
548 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_TRANSMITTED_BSSID);
549 coloc_ap->unsolicited_probe =
550 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_PROBE_ACTIVE);
551 coloc_ap->colocated_ess =
552 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_ESS);
554 return u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_AP);
557 static int cfg80211_calc_short_ssid(const struct cfg80211_bss_ies *ies,
558 const struct element **elem, u32 *s_ssid)
561 *elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len);
562 if (!*elem || (*elem)->datalen > IEEE80211_MAX_SSID_LEN)
565 *s_ssid = ~crc32_le(~0, (*elem)->data, (*elem)->datalen);
569 static void cfg80211_free_coloc_ap_list(struct list_head *coloc_ap_list)
571 struct cfg80211_colocated_ap *ap, *tmp_ap;
573 list_for_each_entry_safe(ap, tmp_ap, coloc_ap_list, list) {
579 static int cfg80211_parse_ap_info(struct cfg80211_colocated_ap *entry,
580 const u8 *pos, u8 length,
581 const struct element *ssid_elem,
586 entry->psd_20 = IEEE80211_RNR_TBTT_PARAMS_PSD_RESERVED;
588 /* The length is already verified by the caller to contain bss_params */
589 if (length > sizeof(struct ieee80211_tbtt_info_7_8_9)) {
590 struct ieee80211_tbtt_info_ge_11 *tbtt_info = (void *)pos;
592 memcpy(entry->bssid, tbtt_info->bssid, ETH_ALEN);
593 entry->short_ssid = le32_to_cpu(tbtt_info->short_ssid);
594 entry->short_ssid_valid = true;
596 bss_params = tbtt_info->bss_params;
598 /* Ignore disabled links */
599 if (length >= offsetofend(typeof(*tbtt_info), mld_params)) {
600 if (le16_get_bits(tbtt_info->mld_params.params,
601 IEEE80211_RNR_MLD_PARAMS_DISABLED_LINK))
605 if (length >= offsetofend(struct ieee80211_tbtt_info_ge_11,
607 entry->psd_20 = tbtt_info->psd_20;
609 struct ieee80211_tbtt_info_7_8_9 *tbtt_info = (void *)pos;
611 memcpy(entry->bssid, tbtt_info->bssid, ETH_ALEN);
613 bss_params = tbtt_info->bss_params;
615 if (length == offsetofend(struct ieee80211_tbtt_info_7_8_9,
617 entry->psd_20 = tbtt_info->psd_20;
620 /* ignore entries with invalid BSSID */
621 if (!is_valid_ether_addr(entry->bssid))
624 /* skip non colocated APs */
625 if (!cfg80211_parse_bss_param(bss_params, entry))
628 /* no information about the short ssid. Consider the entry valid
629 * for now. It would later be dropped in case there are explicit
630 * SSIDs that need to be matched
632 if (!entry->same_ssid && !entry->short_ssid_valid)
635 if (entry->same_ssid) {
636 entry->short_ssid = s_ssid_tmp;
637 entry->short_ssid_valid = true;
640 * This is safe because we validate datalen in
641 * cfg80211_parse_colocated_ap(), before calling this
644 memcpy(&entry->ssid, &ssid_elem->data, ssid_elem->datalen);
645 entry->ssid_len = ssid_elem->datalen;
651 static int cfg80211_parse_colocated_ap(const struct cfg80211_bss_ies *ies,
652 struct list_head *list)
654 struct ieee80211_neighbor_ap_info *ap_info;
655 const struct element *elem, *ssid_elem;
658 int n_coloc = 0, ret;
661 ret = cfg80211_calc_short_ssid(ies, &ssid_elem, &s_ssid_tmp);
665 for_each_element_id(elem, WLAN_EID_REDUCED_NEIGHBOR_REPORT,
666 ies->data, ies->len) {
668 end = elem->data + elem->datalen;
670 /* RNR IE may contain more than one NEIGHBOR_AP_INFO */
671 while (pos + sizeof(*ap_info) <= end) {
672 enum nl80211_band band;
676 ap_info = (void *)pos;
677 count = u8_get_bits(ap_info->tbtt_info_hdr,
678 IEEE80211_AP_INFO_TBTT_HDR_COUNT) + 1;
679 length = ap_info->tbtt_info_len;
681 pos += sizeof(*ap_info);
683 if (!ieee80211_operating_class_to_band(ap_info->op_class,
687 freq = ieee80211_channel_to_frequency(ap_info->channel,
690 if (end - pos < count * length)
693 if (u8_get_bits(ap_info->tbtt_info_hdr,
694 IEEE80211_AP_INFO_TBTT_HDR_TYPE) !=
695 IEEE80211_TBTT_INFO_TYPE_TBTT) {
696 pos += count * length;
700 /* TBTT info must include bss param + BSSID +
701 * (short SSID or same_ssid bit to be set).
702 * ignore other options, and move to the
705 if (band != NL80211_BAND_6GHZ ||
706 !(length == offsetofend(struct ieee80211_tbtt_info_7_8_9,
708 length == sizeof(struct ieee80211_tbtt_info_7_8_9) ||
709 length >= offsetofend(struct ieee80211_tbtt_info_ge_11,
711 pos += count * length;
715 for (i = 0; i < count; i++) {
716 struct cfg80211_colocated_ap *entry;
718 entry = kzalloc(sizeof(*entry) + IEEE80211_MAX_SSID_LEN,
724 entry->center_freq = freq;
726 if (!cfg80211_parse_ap_info(entry, pos, length,
730 list_add_tail(&entry->list, &ap_list);
741 cfg80211_free_coloc_ap_list(&ap_list);
746 list_splice_tail(&ap_list, list);
750 static void cfg80211_scan_req_add_chan(struct cfg80211_scan_request *request,
751 struct ieee80211_channel *chan,
755 u32 n_channels = request->n_channels;
756 struct cfg80211_scan_6ghz_params *params =
757 &request->scan_6ghz_params[request->n_6ghz_params];
759 for (i = 0; i < n_channels; i++) {
760 if (request->channels[i] == chan) {
762 params->channel_idx = i;
767 request->channels[n_channels] = chan;
769 request->scan_6ghz_params[request->n_6ghz_params].channel_idx =
772 request->n_channels++;
775 static bool cfg80211_find_ssid_match(struct cfg80211_colocated_ap *ap,
776 struct cfg80211_scan_request *request)
781 for (i = 0; i < request->n_ssids; i++) {
782 /* wildcard ssid in the scan request */
783 if (!request->ssids[i].ssid_len) {
784 if (ap->multi_bss && !ap->transmitted_bssid)
791 ap->ssid_len == request->ssids[i].ssid_len) {
792 if (!memcmp(request->ssids[i].ssid, ap->ssid,
795 } else if (ap->short_ssid_valid) {
796 s_ssid = ~crc32_le(~0, request->ssids[i].ssid,
797 request->ssids[i].ssid_len);
799 if (ap->short_ssid == s_ssid)
807 static int cfg80211_scan_6ghz(struct cfg80211_registered_device *rdev)
810 struct cfg80211_colocated_ap *ap;
811 int n_channels, count = 0, err;
812 struct cfg80211_scan_request *request, *rdev_req = rdev->scan_req;
813 LIST_HEAD(coloc_ap_list);
814 bool need_scan_psc = true;
815 const struct ieee80211_sband_iftype_data *iftd;
817 rdev_req->scan_6ghz = true;
819 if (!rdev->wiphy.bands[NL80211_BAND_6GHZ])
822 iftd = ieee80211_get_sband_iftype_data(rdev->wiphy.bands[NL80211_BAND_6GHZ],
823 rdev_req->wdev->iftype);
824 if (!iftd || !iftd->he_cap.has_he)
827 n_channels = rdev->wiphy.bands[NL80211_BAND_6GHZ]->n_channels;
829 if (rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ) {
830 struct cfg80211_internal_bss *intbss;
832 spin_lock_bh(&rdev->bss_lock);
833 list_for_each_entry(intbss, &rdev->bss_list, list) {
834 struct cfg80211_bss *res = &intbss->pub;
835 const struct cfg80211_bss_ies *ies;
836 const struct element *ssid_elem;
837 struct cfg80211_colocated_ap *entry;
841 ies = rcu_access_pointer(res->ies);
842 count += cfg80211_parse_colocated_ap(ies,
845 /* In case the scan request specified a specific BSSID
846 * and the BSS is found and operating on 6GHz band then
847 * add this AP to the collocated APs list.
848 * This is relevant for ML probe requests when the lower
849 * band APs have not been discovered.
851 if (is_broadcast_ether_addr(rdev_req->bssid) ||
852 !ether_addr_equal(rdev_req->bssid, res->bssid) ||
853 res->channel->band != NL80211_BAND_6GHZ)
856 ret = cfg80211_calc_short_ssid(ies, &ssid_elem,
861 entry = kzalloc(sizeof(*entry) + IEEE80211_MAX_SSID_LEN,
867 memcpy(entry->bssid, res->bssid, ETH_ALEN);
868 entry->short_ssid = s_ssid_tmp;
869 memcpy(entry->ssid, ssid_elem->data,
871 entry->ssid_len = ssid_elem->datalen;
872 entry->short_ssid_valid = true;
873 entry->center_freq = res->channel->center_freq;
875 list_add_tail(&entry->list, &coloc_ap_list);
878 spin_unlock_bh(&rdev->bss_lock);
881 request = kzalloc(struct_size(request, channels, n_channels) +
882 sizeof(*request->scan_6ghz_params) * count +
883 sizeof(*request->ssids) * rdev_req->n_ssids,
886 cfg80211_free_coloc_ap_list(&coloc_ap_list);
890 *request = *rdev_req;
891 request->n_channels = 0;
892 request->scan_6ghz_params =
893 (void *)&request->channels[n_channels];
896 * PSC channels should not be scanned in case of direct scan with 1 SSID
897 * and at least one of the reported co-located APs with same SSID
898 * indicating that all APs in the same ESS are co-located
900 if (count && request->n_ssids == 1 && request->ssids[0].ssid_len) {
901 list_for_each_entry(ap, &coloc_ap_list, list) {
902 if (ap->colocated_ess &&
903 cfg80211_find_ssid_match(ap, request)) {
904 need_scan_psc = false;
911 * add to the scan request the channels that need to be scanned
912 * regardless of the collocated APs (PSC channels or all channels
913 * in case that NL80211_SCAN_FLAG_COLOCATED_6GHZ is not set)
915 for (i = 0; i < rdev_req->n_channels; i++) {
916 if (rdev_req->channels[i]->band == NL80211_BAND_6GHZ &&
918 cfg80211_channel_is_psc(rdev_req->channels[i])) ||
919 !(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))) {
920 cfg80211_scan_req_add_chan(request,
921 rdev_req->channels[i],
926 if (!(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))
929 list_for_each_entry(ap, &coloc_ap_list, list) {
931 struct cfg80211_scan_6ghz_params *scan_6ghz_params =
932 &request->scan_6ghz_params[request->n_6ghz_params];
933 struct ieee80211_channel *chan =
934 ieee80211_get_channel(&rdev->wiphy, ap->center_freq);
936 if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
939 for (i = 0; i < rdev_req->n_channels; i++) {
940 if (rdev_req->channels[i] == chan)
947 if (request->n_ssids > 0 &&
948 !cfg80211_find_ssid_match(ap, request))
951 if (!is_broadcast_ether_addr(request->bssid) &&
952 !ether_addr_equal(request->bssid, ap->bssid))
955 if (!request->n_ssids && ap->multi_bss && !ap->transmitted_bssid)
958 cfg80211_scan_req_add_chan(request, chan, true);
959 memcpy(scan_6ghz_params->bssid, ap->bssid, ETH_ALEN);
960 scan_6ghz_params->short_ssid = ap->short_ssid;
961 scan_6ghz_params->short_ssid_valid = ap->short_ssid_valid;
962 scan_6ghz_params->unsolicited_probe = ap->unsolicited_probe;
963 scan_6ghz_params->psd_20 = ap->psd_20;
966 * If a PSC channel is added to the scan and 'need_scan_psc' is
967 * set to false, then all the APs that the scan logic is
968 * interested with on the channel are collocated and thus there
969 * is no need to perform the initial PSC channel listen.
971 if (cfg80211_channel_is_psc(chan) && !need_scan_psc)
972 scan_6ghz_params->psc_no_listen = true;
974 request->n_6ghz_params++;
978 cfg80211_free_coloc_ap_list(&coloc_ap_list);
980 if (request->n_channels) {
981 struct cfg80211_scan_request *old = rdev->int_scan_req;
982 rdev->int_scan_req = request;
985 * Add the ssids from the parent scan request to the new scan
986 * request, so the driver would be able to use them in its
987 * probe requests to discover hidden APs on PSC channels.
989 request->ssids = (void *)&request->channels[request->n_channels];
990 request->n_ssids = rdev_req->n_ssids;
991 memcpy(request->ssids, rdev_req->ssids, sizeof(*request->ssids) *
995 * If this scan follows a previous scan, save the scan start
996 * info from the first part of the scan
999 rdev->int_scan_req->info = old->info;
1001 err = rdev_scan(rdev, request);
1003 rdev->int_scan_req = old;
1016 int cfg80211_scan(struct cfg80211_registered_device *rdev)
1018 struct cfg80211_scan_request *request;
1019 struct cfg80211_scan_request *rdev_req = rdev->scan_req;
1020 u32 n_channels = 0, idx, i;
1022 if (!(rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ))
1023 return rdev_scan(rdev, rdev_req);
1025 for (i = 0; i < rdev_req->n_channels; i++) {
1026 if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ)
1031 return cfg80211_scan_6ghz(rdev);
1033 request = kzalloc(struct_size(request, channels, n_channels),
1038 *request = *rdev_req;
1039 request->n_channels = n_channels;
1041 for (i = idx = 0; i < rdev_req->n_channels; i++) {
1042 if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ)
1043 request->channels[idx++] = rdev_req->channels[i];
1046 rdev_req->scan_6ghz = false;
1047 rdev->int_scan_req = request;
1048 return rdev_scan(rdev, request);
1051 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
1054 struct cfg80211_scan_request *request, *rdev_req;
1055 struct wireless_dev *wdev;
1056 struct sk_buff *msg;
1057 #ifdef CONFIG_CFG80211_WEXT
1058 union iwreq_data wrqu;
1061 lockdep_assert_held(&rdev->wiphy.mtx);
1063 if (rdev->scan_msg) {
1064 nl80211_send_scan_msg(rdev, rdev->scan_msg);
1065 rdev->scan_msg = NULL;
1069 rdev_req = rdev->scan_req;
1073 wdev = rdev_req->wdev;
1074 request = rdev->int_scan_req ? rdev->int_scan_req : rdev_req;
1076 if (wdev_running(wdev) &&
1077 (rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ) &&
1078 !rdev_req->scan_6ghz && !request->info.aborted &&
1079 !cfg80211_scan_6ghz(rdev))
1083 * This must be before sending the other events!
1084 * Otherwise, wpa_supplicant gets completely confused with
1088 cfg80211_sme_scan_done(wdev->netdev);
1090 if (!request->info.aborted &&
1091 request->flags & NL80211_SCAN_FLAG_FLUSH) {
1092 /* flush entries from previous scans */
1093 spin_lock_bh(&rdev->bss_lock);
1094 __cfg80211_bss_expire(rdev, request->scan_start);
1095 spin_unlock_bh(&rdev->bss_lock);
1098 msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted);
1100 #ifdef CONFIG_CFG80211_WEXT
1101 if (wdev->netdev && !request->info.aborted) {
1102 memset(&wrqu, 0, sizeof(wrqu));
1104 wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
1108 dev_put(wdev->netdev);
1110 kfree(rdev->int_scan_req);
1111 rdev->int_scan_req = NULL;
1113 kfree(rdev->scan_req);
1114 rdev->scan_req = NULL;
1117 rdev->scan_msg = msg;
1119 nl80211_send_scan_msg(rdev, msg);
1122 void __cfg80211_scan_done(struct wiphy *wiphy, struct wiphy_work *wk)
1124 ___cfg80211_scan_done(wiphy_to_rdev(wiphy), true);
1127 void cfg80211_scan_done(struct cfg80211_scan_request *request,
1128 struct cfg80211_scan_info *info)
1130 struct cfg80211_scan_info old_info = request->info;
1132 trace_cfg80211_scan_done(request, info);
1133 WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req &&
1134 request != wiphy_to_rdev(request->wiphy)->int_scan_req);
1136 request->info = *info;
1139 * In case the scan is split, the scan_start_tsf and tsf_bssid should
1140 * be of the first part. In such a case old_info.scan_start_tsf should
1143 if (request->scan_6ghz && old_info.scan_start_tsf) {
1144 request->info.scan_start_tsf = old_info.scan_start_tsf;
1145 memcpy(request->info.tsf_bssid, old_info.tsf_bssid,
1146 sizeof(request->info.tsf_bssid));
1149 request->notified = true;
1150 wiphy_work_queue(request->wiphy,
1151 &wiphy_to_rdev(request->wiphy)->scan_done_wk);
1153 EXPORT_SYMBOL(cfg80211_scan_done);
1155 void cfg80211_add_sched_scan_req(struct cfg80211_registered_device *rdev,
1156 struct cfg80211_sched_scan_request *req)
1158 lockdep_assert_held(&rdev->wiphy.mtx);
1160 list_add_rcu(&req->list, &rdev->sched_scan_req_list);
1163 static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device *rdev,
1164 struct cfg80211_sched_scan_request *req)
1166 lockdep_assert_held(&rdev->wiphy.mtx);
1168 list_del_rcu(&req->list);
1169 kfree_rcu(req, rcu_head);
1172 static struct cfg80211_sched_scan_request *
1173 cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid)
1175 struct cfg80211_sched_scan_request *pos;
1177 list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list,
1178 lockdep_is_held(&rdev->wiphy.mtx)) {
1179 if (pos->reqid == reqid)
1186 * Determines if a scheduled scan request can be handled. When a legacy
1187 * scheduled scan is running no other scheduled scan is allowed regardless
1188 * whether the request is for legacy or multi-support scan. When a multi-support
1189 * scheduled scan is running a request for legacy scan is not allowed. In this
1190 * case a request for multi-support scan can be handled if resources are
1191 * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached.
1193 int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev,
1196 struct cfg80211_sched_scan_request *pos;
1199 list_for_each_entry(pos, &rdev->sched_scan_req_list, list) {
1200 /* request id zero means legacy in progress */
1201 if (!i && !pos->reqid)
1202 return -EINPROGRESS;
1207 /* no legacy allowed when multi request(s) are active */
1209 return -EINPROGRESS;
1211 /* resource limit reached */
1212 if (i == rdev->wiphy.max_sched_scan_reqs)
1218 void cfg80211_sched_scan_results_wk(struct work_struct *work)
1220 struct cfg80211_registered_device *rdev;
1221 struct cfg80211_sched_scan_request *req, *tmp;
1223 rdev = container_of(work, struct cfg80211_registered_device,
1226 wiphy_lock(&rdev->wiphy);
1227 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
1228 if (req->report_results) {
1229 req->report_results = false;
1230 if (req->flags & NL80211_SCAN_FLAG_FLUSH) {
1231 /* flush entries from previous scans */
1232 spin_lock_bh(&rdev->bss_lock);
1233 __cfg80211_bss_expire(rdev, req->scan_start);
1234 spin_unlock_bh(&rdev->bss_lock);
1235 req->scan_start = jiffies;
1237 nl80211_send_sched_scan(req,
1238 NL80211_CMD_SCHED_SCAN_RESULTS);
1241 wiphy_unlock(&rdev->wiphy);
1244 void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid)
1246 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1247 struct cfg80211_sched_scan_request *request;
1249 trace_cfg80211_sched_scan_results(wiphy, reqid);
1250 /* ignore if we're not scanning */
1253 request = cfg80211_find_sched_scan_req(rdev, reqid);
1255 request->report_results = true;
1256 queue_work(cfg80211_wq, &rdev->sched_scan_res_wk);
1260 EXPORT_SYMBOL(cfg80211_sched_scan_results);
1262 void cfg80211_sched_scan_stopped_locked(struct wiphy *wiphy, u64 reqid)
1264 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1266 lockdep_assert_held(&wiphy->mtx);
1268 trace_cfg80211_sched_scan_stopped(wiphy, reqid);
1270 __cfg80211_stop_sched_scan(rdev, reqid, true);
1272 EXPORT_SYMBOL(cfg80211_sched_scan_stopped_locked);
1274 void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid)
1277 cfg80211_sched_scan_stopped_locked(wiphy, reqid);
1278 wiphy_unlock(wiphy);
1280 EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
1282 int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev,
1283 struct cfg80211_sched_scan_request *req,
1284 bool driver_initiated)
1286 lockdep_assert_held(&rdev->wiphy.mtx);
1288 if (!driver_initiated) {
1289 int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid);
1294 nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED);
1296 cfg80211_del_sched_scan_req(rdev, req);
1301 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
1302 u64 reqid, bool driver_initiated)
1304 struct cfg80211_sched_scan_request *sched_scan_req;
1306 lockdep_assert_held(&rdev->wiphy.mtx);
1308 sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid);
1309 if (!sched_scan_req)
1312 return cfg80211_stop_sched_scan_req(rdev, sched_scan_req,
1316 void cfg80211_bss_age(struct cfg80211_registered_device *rdev,
1317 unsigned long age_secs)
1319 struct cfg80211_internal_bss *bss;
1320 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
1322 spin_lock_bh(&rdev->bss_lock);
1323 list_for_each_entry(bss, &rdev->bss_list, list)
1324 bss->ts -= age_jiffies;
1325 spin_unlock_bh(&rdev->bss_lock);
1328 void cfg80211_bss_expire(struct cfg80211_registered_device *rdev)
1330 __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
1333 void cfg80211_bss_flush(struct wiphy *wiphy)
1335 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1337 spin_lock_bh(&rdev->bss_lock);
1338 __cfg80211_bss_expire(rdev, jiffies);
1339 spin_unlock_bh(&rdev->bss_lock);
1341 EXPORT_SYMBOL(cfg80211_bss_flush);
1343 const struct element *
1344 cfg80211_find_elem_match(u8 eid, const u8 *ies, unsigned int len,
1345 const u8 *match, unsigned int match_len,
1346 unsigned int match_offset)
1348 const struct element *elem;
1350 for_each_element_id(elem, eid, ies, len) {
1351 if (elem->datalen >= match_offset + match_len &&
1352 !memcmp(elem->data + match_offset, match, match_len))
1358 EXPORT_SYMBOL(cfg80211_find_elem_match);
1360 const struct element *cfg80211_find_vendor_elem(unsigned int oui, int oui_type,
1364 const struct element *elem;
1365 u8 match[] = { oui >> 16, oui >> 8, oui, oui_type };
1366 int match_len = (oui_type < 0) ? 3 : sizeof(match);
1368 if (WARN_ON(oui_type > 0xff))
1371 elem = cfg80211_find_elem_match(WLAN_EID_VENDOR_SPECIFIC, ies, len,
1372 match, match_len, 0);
1374 if (!elem || elem->datalen < 4)
1379 EXPORT_SYMBOL(cfg80211_find_vendor_elem);
1382 * enum bss_compare_mode - BSS compare mode
1383 * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
1384 * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
1385 * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
1387 enum bss_compare_mode {
1393 static int cmp_bss(struct cfg80211_bss *a,
1394 struct cfg80211_bss *b,
1395 enum bss_compare_mode mode)
1397 const struct cfg80211_bss_ies *a_ies, *b_ies;
1398 const u8 *ie1 = NULL;
1399 const u8 *ie2 = NULL;
1402 if (a->channel != b->channel)
1403 return (b->channel->center_freq * 1000 + b->channel->freq_offset) -
1404 (a->channel->center_freq * 1000 + a->channel->freq_offset);
1406 a_ies = rcu_access_pointer(a->ies);
1409 b_ies = rcu_access_pointer(b->ies);
1413 if (WLAN_CAPABILITY_IS_STA_BSS(a->capability))
1414 ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID,
1415 a_ies->data, a_ies->len);
1416 if (WLAN_CAPABILITY_IS_STA_BSS(b->capability))
1417 ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID,
1418 b_ies->data, b_ies->len);
1422 if (ie1[1] == ie2[1])
1423 mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]);
1425 mesh_id_cmp = ie2[1] - ie1[1];
1427 ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
1428 a_ies->data, a_ies->len);
1429 ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
1430 b_ies->data, b_ies->len);
1434 if (ie1[1] != ie2[1])
1435 return ie2[1] - ie1[1];
1436 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
1440 r = memcmp(a->bssid, b->bssid, sizeof(a->bssid));
1444 ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
1445 ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
1451 * Note that with "hide_ssid", the function returns a match if
1452 * the already-present BSS ("b") is a hidden SSID beacon for
1453 * the new BSS ("a").
1456 /* sort missing IE before (left of) present IE */
1463 case BSS_CMP_HIDE_ZLEN:
1465 * In ZLEN mode we assume the BSS entry we're
1466 * looking for has a zero-length SSID. So if
1467 * the one we're looking at right now has that,
1468 * return 0. Otherwise, return the difference
1469 * in length, but since we're looking for the
1470 * 0-length it's really equivalent to returning
1471 * the length of the one we're looking at.
1473 * No content comparison is needed as we assume
1474 * the content length is zero.
1477 case BSS_CMP_REGULAR:
1479 /* sort by length first, then by contents */
1480 if (ie1[1] != ie2[1])
1481 return ie2[1] - ie1[1];
1482 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
1483 case BSS_CMP_HIDE_NUL:
1484 if (ie1[1] != ie2[1])
1485 return ie2[1] - ie1[1];
1486 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */
1487 for (i = 0; i < ie2[1]; i++)
1494 static bool cfg80211_bss_type_match(u16 capability,
1495 enum nl80211_band band,
1496 enum ieee80211_bss_type bss_type)
1501 if (bss_type == IEEE80211_BSS_TYPE_ANY)
1504 if (band == NL80211_BAND_60GHZ) {
1505 mask = WLAN_CAPABILITY_DMG_TYPE_MASK;
1507 case IEEE80211_BSS_TYPE_ESS:
1508 val = WLAN_CAPABILITY_DMG_TYPE_AP;
1510 case IEEE80211_BSS_TYPE_PBSS:
1511 val = WLAN_CAPABILITY_DMG_TYPE_PBSS;
1513 case IEEE80211_BSS_TYPE_IBSS:
1514 val = WLAN_CAPABILITY_DMG_TYPE_IBSS;
1520 mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS;
1522 case IEEE80211_BSS_TYPE_ESS:
1523 val = WLAN_CAPABILITY_ESS;
1525 case IEEE80211_BSS_TYPE_IBSS:
1526 val = WLAN_CAPABILITY_IBSS;
1528 case IEEE80211_BSS_TYPE_MBSS:
1536 ret = ((capability & mask) == val);
1540 /* Returned bss is reference counted and must be cleaned up appropriately. */
1541 struct cfg80211_bss *__cfg80211_get_bss(struct wiphy *wiphy,
1542 struct ieee80211_channel *channel,
1544 const u8 *ssid, size_t ssid_len,
1545 enum ieee80211_bss_type bss_type,
1546 enum ieee80211_privacy privacy,
1549 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1550 struct cfg80211_internal_bss *bss, *res = NULL;
1551 unsigned long now = jiffies;
1554 trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type,
1557 spin_lock_bh(&rdev->bss_lock);
1559 list_for_each_entry(bss, &rdev->bss_list, list) {
1560 if (!cfg80211_bss_type_match(bss->pub.capability,
1561 bss->pub.channel->band, bss_type))
1564 bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY);
1565 if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) ||
1566 (privacy == IEEE80211_PRIVACY_OFF && bss_privacy))
1568 if (channel && bss->pub.channel != channel)
1570 if (!is_valid_ether_addr(bss->pub.bssid))
1572 if ((bss->pub.use_for & use_for) != use_for)
1574 /* Don't get expired BSS structs */
1575 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
1576 !atomic_read(&bss->hold))
1578 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
1580 bss_ref_get(rdev, res);
1585 spin_unlock_bh(&rdev->bss_lock);
1588 trace_cfg80211_return_bss(&res->pub);
1591 EXPORT_SYMBOL(__cfg80211_get_bss);
1593 static void rb_insert_bss(struct cfg80211_registered_device *rdev,
1594 struct cfg80211_internal_bss *bss)
1596 struct rb_node **p = &rdev->bss_tree.rb_node;
1597 struct rb_node *parent = NULL;
1598 struct cfg80211_internal_bss *tbss;
1603 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
1605 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR);
1607 if (WARN_ON(!cmp)) {
1608 /* will sort of leak this BSS */
1615 p = &(*p)->rb_right;
1618 rb_link_node(&bss->rbn, parent, p);
1619 rb_insert_color(&bss->rbn, &rdev->bss_tree);
1622 static struct cfg80211_internal_bss *
1623 rb_find_bss(struct cfg80211_registered_device *rdev,
1624 struct cfg80211_internal_bss *res,
1625 enum bss_compare_mode mode)
1627 struct rb_node *n = rdev->bss_tree.rb_node;
1628 struct cfg80211_internal_bss *bss;
1632 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
1633 r = cmp_bss(&res->pub, &bss->pub, mode);
1646 static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev,
1647 struct cfg80211_internal_bss *new)
1649 const struct cfg80211_bss_ies *ies;
1650 struct cfg80211_internal_bss *bss;
1656 ies = rcu_access_pointer(new->pub.beacon_ies);
1660 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
1667 for (i = 0; i < ssidlen; i++)
1671 /* not a hidden SSID */
1675 /* This is the bad part ... */
1677 list_for_each_entry(bss, &rdev->bss_list, list) {
1679 * we're iterating all the entries anyway, so take the
1680 * opportunity to validate the list length accounting
1684 if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid))
1686 if (bss->pub.channel != new->pub.channel)
1688 if (rcu_access_pointer(bss->pub.beacon_ies))
1690 ies = rcu_access_pointer(bss->pub.ies);
1693 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
1696 if (ssidlen && ie[1] != ssidlen)
1698 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss))
1700 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list)))
1701 list_del(&bss->hidden_list);
1703 list_add(&bss->hidden_list, &new->hidden_list);
1704 bss->pub.hidden_beacon_bss = &new->pub;
1705 new->refcount += bss->refcount;
1706 rcu_assign_pointer(bss->pub.beacon_ies,
1707 new->pub.beacon_ies);
1710 WARN_ONCE(n_entries != rdev->bss_entries,
1711 "rdev bss entries[%d]/list[len:%d] corruption\n",
1712 rdev->bss_entries, n_entries);
1717 static void cfg80211_update_hidden_bsses(struct cfg80211_internal_bss *known,
1718 const struct cfg80211_bss_ies *new_ies,
1719 const struct cfg80211_bss_ies *old_ies)
1721 struct cfg80211_internal_bss *bss;
1723 /* Assign beacon IEs to all sub entries */
1724 list_for_each_entry(bss, &known->hidden_list, hidden_list) {
1725 const struct cfg80211_bss_ies *ies;
1727 ies = rcu_access_pointer(bss->pub.beacon_ies);
1728 WARN_ON(ies != old_ies);
1730 rcu_assign_pointer(bss->pub.beacon_ies, new_ies);
1735 cfg80211_update_known_bss(struct cfg80211_registered_device *rdev,
1736 struct cfg80211_internal_bss *known,
1737 struct cfg80211_internal_bss *new,
1740 lockdep_assert_held(&rdev->bss_lock);
1743 if (rcu_access_pointer(new->pub.proberesp_ies)) {
1744 const struct cfg80211_bss_ies *old;
1746 old = rcu_access_pointer(known->pub.proberesp_ies);
1748 rcu_assign_pointer(known->pub.proberesp_ies,
1749 new->pub.proberesp_ies);
1750 /* Override possible earlier Beacon frame IEs */
1751 rcu_assign_pointer(known->pub.ies,
1752 new->pub.proberesp_ies);
1754 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1757 if (rcu_access_pointer(new->pub.beacon_ies)) {
1758 const struct cfg80211_bss_ies *old;
1760 if (known->pub.hidden_beacon_bss &&
1761 !list_empty(&known->hidden_list)) {
1762 const struct cfg80211_bss_ies *f;
1764 /* The known BSS struct is one of the probe
1765 * response members of a group, but we're
1766 * receiving a beacon (beacon_ies in the new
1767 * bss is used). This can only mean that the
1768 * AP changed its beacon from not having an
1769 * SSID to showing it, which is confusing so
1770 * drop this information.
1773 f = rcu_access_pointer(new->pub.beacon_ies);
1774 kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head);
1778 old = rcu_access_pointer(known->pub.beacon_ies);
1780 rcu_assign_pointer(known->pub.beacon_ies, new->pub.beacon_ies);
1782 /* Override IEs if they were from a beacon before */
1783 if (old == rcu_access_pointer(known->pub.ies))
1784 rcu_assign_pointer(known->pub.ies, new->pub.beacon_ies);
1786 cfg80211_update_hidden_bsses(known,
1787 rcu_access_pointer(new->pub.beacon_ies),
1791 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1794 known->pub.beacon_interval = new->pub.beacon_interval;
1796 /* don't update the signal if beacon was heard on
1800 known->pub.signal = new->pub.signal;
1801 known->pub.capability = new->pub.capability;
1802 known->ts = new->ts;
1803 known->ts_boottime = new->ts_boottime;
1804 known->parent_tsf = new->parent_tsf;
1805 known->pub.chains = new->pub.chains;
1806 memcpy(known->pub.chain_signal, new->pub.chain_signal,
1807 IEEE80211_MAX_CHAINS);
1808 ether_addr_copy(known->parent_bssid, new->parent_bssid);
1809 known->pub.max_bssid_indicator = new->pub.max_bssid_indicator;
1810 known->pub.bssid_index = new->pub.bssid_index;
1811 known->pub.use_for &= new->pub.use_for;
1812 known->pub.cannot_use_reasons = new->pub.cannot_use_reasons;
1817 /* Returned bss is reference counted and must be cleaned up appropriately. */
1818 static struct cfg80211_internal_bss *
1819 __cfg80211_bss_update(struct cfg80211_registered_device *rdev,
1820 struct cfg80211_internal_bss *tmp,
1821 bool signal_valid, unsigned long ts)
1823 struct cfg80211_internal_bss *found = NULL;
1824 struct cfg80211_bss_ies *ies;
1826 if (WARN_ON(!tmp->pub.channel))
1831 if (WARN_ON(!rcu_access_pointer(tmp->pub.ies)))
1834 found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR);
1837 if (!cfg80211_update_known_bss(rdev, found, tmp, signal_valid))
1840 struct cfg80211_internal_bss *new;
1841 struct cfg80211_internal_bss *hidden;
1844 * create a copy -- the "res" variable that is passed in
1845 * is allocated on the stack since it's not needed in the
1846 * more common case of an update
1848 new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size,
1852 memcpy(new, tmp, sizeof(*new));
1854 INIT_LIST_HEAD(&new->hidden_list);
1855 INIT_LIST_HEAD(&new->pub.nontrans_list);
1856 /* we'll set this later if it was non-NULL */
1857 new->pub.transmitted_bss = NULL;
1859 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
1860 hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
1862 hidden = rb_find_bss(rdev, tmp,
1865 new->pub.hidden_beacon_bss = &hidden->pub;
1866 list_add(&new->hidden_list,
1867 &hidden->hidden_list);
1870 ies = (void *)rcu_access_pointer(new->pub.beacon_ies);
1871 rcu_assign_pointer(new->pub.beacon_ies,
1872 hidden->pub.beacon_ies);
1874 kfree_rcu(ies, rcu_head);
1878 * Ok so we found a beacon, and don't have an entry. If
1879 * it's a beacon with hidden SSID, we might be in for an
1880 * expensive search for any probe responses that should
1881 * be grouped with this beacon for updates ...
1883 if (!cfg80211_combine_bsses(rdev, new)) {
1884 bss_ref_put(rdev, new);
1889 if (rdev->bss_entries >= bss_entries_limit &&
1890 !cfg80211_bss_expire_oldest(rdev)) {
1891 bss_ref_put(rdev, new);
1895 /* This must be before the call to bss_ref_get */
1896 if (tmp->pub.transmitted_bss) {
1897 new->pub.transmitted_bss = tmp->pub.transmitted_bss;
1898 bss_ref_get(rdev, bss_from_pub(tmp->pub.transmitted_bss));
1901 list_add_tail(&new->list, &rdev->bss_list);
1902 rdev->bss_entries++;
1903 rb_insert_bss(rdev, new);
1907 rdev->bss_generation++;
1908 bss_ref_get(rdev, found);
1913 ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
1915 kfree_rcu(ies, rcu_head);
1916 ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
1918 kfree_rcu(ies, rcu_head);
1923 struct cfg80211_internal_bss *
1924 cfg80211_bss_update(struct cfg80211_registered_device *rdev,
1925 struct cfg80211_internal_bss *tmp,
1926 bool signal_valid, unsigned long ts)
1928 struct cfg80211_internal_bss *res;
1930 spin_lock_bh(&rdev->bss_lock);
1931 res = __cfg80211_bss_update(rdev, tmp, signal_valid, ts);
1932 spin_unlock_bh(&rdev->bss_lock);
1937 int cfg80211_get_ies_channel_number(const u8 *ie, size_t ielen,
1938 enum nl80211_band band)
1940 const struct element *tmp;
1942 if (band == NL80211_BAND_6GHZ) {
1943 struct ieee80211_he_operation *he_oper;
1945 tmp = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie,
1947 if (tmp && tmp->datalen >= sizeof(*he_oper) &&
1948 tmp->datalen >= ieee80211_he_oper_size(&tmp->data[1])) {
1949 const struct ieee80211_he_6ghz_oper *he_6ghz_oper;
1951 he_oper = (void *)&tmp->data[1];
1953 he_6ghz_oper = ieee80211_he_6ghz_oper(he_oper);
1957 return he_6ghz_oper->primary;
1959 } else if (band == NL80211_BAND_S1GHZ) {
1960 tmp = cfg80211_find_elem(WLAN_EID_S1G_OPERATION, ie, ielen);
1961 if (tmp && tmp->datalen >= sizeof(struct ieee80211_s1g_oper_ie)) {
1962 struct ieee80211_s1g_oper_ie *s1gop = (void *)tmp->data;
1964 return s1gop->oper_ch;
1967 tmp = cfg80211_find_elem(WLAN_EID_DS_PARAMS, ie, ielen);
1968 if (tmp && tmp->datalen == 1)
1969 return tmp->data[0];
1971 tmp = cfg80211_find_elem(WLAN_EID_HT_OPERATION, ie, ielen);
1973 tmp->datalen >= sizeof(struct ieee80211_ht_operation)) {
1974 struct ieee80211_ht_operation *htop = (void *)tmp->data;
1976 return htop->primary_chan;
1982 EXPORT_SYMBOL(cfg80211_get_ies_channel_number);
1985 * Update RX channel information based on the available frame payload
1986 * information. This is mainly for the 2.4 GHz band where frames can be received
1987 * from neighboring channels and the Beacon frames use the DSSS Parameter Set
1988 * element to indicate the current (transmitting) channel, but this might also
1989 * be needed on other bands if RX frequency does not match with the actual
1990 * operating channel of a BSS, or if the AP reports a different primary channel.
1992 static struct ieee80211_channel *
1993 cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
1994 struct ieee80211_channel *channel)
1998 struct ieee80211_channel *alt_channel;
2000 channel_number = cfg80211_get_ies_channel_number(ie, ielen,
2003 if (channel_number < 0) {
2004 /* No channel information in frame payload */
2008 freq = ieee80211_channel_to_freq_khz(channel_number, channel->band);
2011 * Frame info (beacon/prob res) is the same as received channel,
2012 * no need for further processing.
2014 if (freq == ieee80211_channel_to_khz(channel))
2017 alt_channel = ieee80211_get_channel_khz(wiphy, freq);
2019 if (channel->band == NL80211_BAND_2GHZ ||
2020 channel->band == NL80211_BAND_6GHZ) {
2022 * Better not allow unexpected channels when that could
2023 * be going beyond the 1-11 range (e.g., discovering
2024 * BSS on channel 12 when radio is configured for
2025 * channel 11) or beyond the 6 GHz channel range.
2030 /* No match for the payload channel number - ignore it */
2035 * Use the channel determined through the payload channel number
2036 * instead of the RX channel reported by the driver.
2038 if (alt_channel->flags & IEEE80211_CHAN_DISABLED)
2043 struct cfg80211_inform_single_bss_data {
2044 struct cfg80211_inform_bss *drv_data;
2045 enum cfg80211_bss_frame_type ftype;
2046 struct ieee80211_channel *channel;
2050 u16 beacon_interval;
2055 BSS_SOURCE_DIRECT = 0,
2057 BSS_SOURCE_STA_PROFILE,
2059 /* Set if reporting bss_source != BSS_SOURCE_DIRECT */
2060 struct cfg80211_bss *source_bss;
2061 u8 max_bssid_indicator;
2065 u64 cannot_use_reasons;
2068 /* Returned bss is reference counted and must be cleaned up appropriately. */
2069 static struct cfg80211_bss *
2070 cfg80211_inform_single_bss_data(struct wiphy *wiphy,
2071 struct cfg80211_inform_single_bss_data *data,
2074 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2075 struct cfg80211_inform_bss *drv_data = data->drv_data;
2076 struct cfg80211_bss_ies *ies;
2077 struct ieee80211_channel *channel;
2078 struct cfg80211_internal_bss tmp = {}, *res;
2083 if (WARN_ON(!wiphy))
2086 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
2087 (drv_data->signal < 0 || drv_data->signal > 100)))
2090 if (WARN_ON(data->bss_source != BSS_SOURCE_DIRECT && !data->source_bss))
2093 channel = data->channel;
2095 channel = cfg80211_get_bss_channel(wiphy, data->ie, data->ielen,
2100 memcpy(tmp.pub.bssid, data->bssid, ETH_ALEN);
2101 tmp.pub.channel = channel;
2102 if (data->bss_source != BSS_SOURCE_STA_PROFILE)
2103 tmp.pub.signal = drv_data->signal;
2106 tmp.pub.beacon_interval = data->beacon_interval;
2107 tmp.pub.capability = data->capability;
2108 tmp.ts_boottime = drv_data->boottime_ns;
2109 tmp.parent_tsf = drv_data->parent_tsf;
2110 ether_addr_copy(tmp.parent_bssid, drv_data->parent_bssid);
2111 tmp.pub.use_for = data->use_for;
2112 tmp.pub.cannot_use_reasons = data->cannot_use_reasons;
2114 if (data->bss_source != BSS_SOURCE_DIRECT) {
2115 tmp.pub.transmitted_bss = data->source_bss;
2116 ts = bss_from_pub(data->source_bss)->ts;
2117 tmp.pub.bssid_index = data->bssid_index;
2118 tmp.pub.max_bssid_indicator = data->max_bssid_indicator;
2122 if (channel->band == NL80211_BAND_60GHZ) {
2123 bss_type = data->capability &
2124 WLAN_CAPABILITY_DMG_TYPE_MASK;
2125 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
2126 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
2127 regulatory_hint_found_beacon(wiphy, channel,
2130 if (data->capability & WLAN_CAPABILITY_ESS)
2131 regulatory_hint_found_beacon(wiphy, channel,
2137 * If we do not know here whether the IEs are from a Beacon or Probe
2138 * Response frame, we need to pick one of the options and only use it
2139 * with the driver that does not provide the full Beacon/Probe Response
2140 * frame. Use Beacon frame pointer to avoid indicating that this should
2141 * override the IEs pointer should we have received an earlier
2142 * indication of Probe Response data.
2144 ies = kzalloc(sizeof(*ies) + data->ielen, gfp);
2147 ies->len = data->ielen;
2148 ies->tsf = data->tsf;
2149 ies->from_beacon = false;
2150 memcpy(ies->data, data->ie, data->ielen);
2152 switch (data->ftype) {
2153 case CFG80211_BSS_FTYPE_BEACON:
2154 ies->from_beacon = true;
2156 case CFG80211_BSS_FTYPE_UNKNOWN:
2157 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
2159 case CFG80211_BSS_FTYPE_PRESP:
2160 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
2163 rcu_assign_pointer(tmp.pub.ies, ies);
2165 signal_valid = drv_data->chan == channel;
2166 spin_lock_bh(&rdev->bss_lock);
2167 res = __cfg80211_bss_update(rdev, &tmp, signal_valid, ts);
2171 rdev_inform_bss(rdev, &res->pub, ies, drv_data->drv_data);
2173 if (data->bss_source == BSS_SOURCE_MBSSID) {
2174 /* this is a nontransmitting bss, we need to add it to
2175 * transmitting bss' list if it is not there
2177 if (cfg80211_add_nontrans_list(data->source_bss, &res->pub)) {
2178 if (__cfg80211_unlink_bss(rdev, res)) {
2179 rdev->bss_generation++;
2187 spin_unlock_bh(&rdev->bss_lock);
2189 trace_cfg80211_return_bss(&res->pub);
2190 /* __cfg80211_bss_update gives us a referenced result */
2194 spin_unlock_bh(&rdev->bss_lock);
2198 static const struct element
2199 *cfg80211_get_profile_continuation(const u8 *ie, size_t ielen,
2200 const struct element *mbssid_elem,
2201 const struct element *sub_elem)
2203 const u8 *mbssid_end = mbssid_elem->data + mbssid_elem->datalen;
2204 const struct element *next_mbssid;
2205 const struct element *next_sub;
2207 next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID,
2209 ielen - (mbssid_end - ie));
2212 * If it is not the last subelement in current MBSSID IE or there isn't
2213 * a next MBSSID IE - profile is complete.
2215 if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) ||
2219 /* For any length error, just return NULL */
2221 if (next_mbssid->datalen < 4)
2224 next_sub = (void *)&next_mbssid->data[1];
2226 if (next_mbssid->data + next_mbssid->datalen <
2227 next_sub->data + next_sub->datalen)
2230 if (next_sub->id != 0 || next_sub->datalen < 2)
2234 * Check if the first element in the next sub element is a start
2237 return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ?
2241 size_t cfg80211_merge_profile(const u8 *ie, size_t ielen,
2242 const struct element *mbssid_elem,
2243 const struct element *sub_elem,
2244 u8 *merged_ie, size_t max_copy_len)
2246 size_t copied_len = sub_elem->datalen;
2247 const struct element *next_mbssid;
2249 if (sub_elem->datalen > max_copy_len)
2252 memcpy(merged_ie, sub_elem->data, sub_elem->datalen);
2254 while ((next_mbssid = cfg80211_get_profile_continuation(ie, ielen,
2257 const struct element *next_sub = (void *)&next_mbssid->data[1];
2259 if (copied_len + next_sub->datalen > max_copy_len)
2261 memcpy(merged_ie + copied_len, next_sub->data,
2263 copied_len += next_sub->datalen;
2268 EXPORT_SYMBOL(cfg80211_merge_profile);
2271 cfg80211_parse_mbssid_data(struct wiphy *wiphy,
2272 struct cfg80211_inform_single_bss_data *tx_data,
2273 struct cfg80211_bss *source_bss,
2276 struct cfg80211_inform_single_bss_data data = {
2277 .drv_data = tx_data->drv_data,
2278 .ftype = tx_data->ftype,
2279 .tsf = tx_data->tsf,
2280 .beacon_interval = tx_data->beacon_interval,
2281 .source_bss = source_bss,
2282 .bss_source = BSS_SOURCE_MBSSID,
2283 .use_for = tx_data->use_for,
2284 .cannot_use_reasons = tx_data->cannot_use_reasons,
2286 const u8 *mbssid_index_ie;
2287 const struct element *elem, *sub;
2288 u8 *new_ie, *profile;
2289 u64 seen_indices = 0;
2290 struct cfg80211_bss *bss;
2294 if (!cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID,
2295 tx_data->ie, tx_data->ielen))
2297 if (!wiphy->support_mbssid)
2299 if (wiphy->support_only_he_mbssid &&
2300 !cfg80211_find_ext_elem(WLAN_EID_EXT_HE_CAPABILITY,
2301 tx_data->ie, tx_data->ielen))
2304 new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp);
2308 profile = kmalloc(tx_data->ielen, gfp);
2312 for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID,
2313 tx_data->ie, tx_data->ielen) {
2314 if (elem->datalen < 4)
2316 if (elem->data[0] < 1 || (int)elem->data[0] > 8)
2318 for_each_element(sub, elem->data + 1, elem->datalen - 1) {
2321 if (sub->id != 0 || sub->datalen < 4) {
2322 /* not a valid BSS profile */
2326 if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP ||
2327 sub->data[1] != 2) {
2328 /* The first element within the Nontransmitted
2329 * BSSID Profile is not the Nontransmitted
2330 * BSSID Capability element.
2335 memset(profile, 0, tx_data->ielen);
2336 profile_len = cfg80211_merge_profile(tx_data->ie,
2343 /* found a Nontransmitted BSSID Profile */
2344 mbssid_index_ie = cfg80211_find_ie
2345 (WLAN_EID_MULTI_BSSID_IDX,
2346 profile, profile_len);
2347 if (!mbssid_index_ie || mbssid_index_ie[1] < 1 ||
2348 mbssid_index_ie[2] == 0 ||
2349 mbssid_index_ie[2] > 46) {
2350 /* No valid Multiple BSSID-Index element */
2354 if (seen_indices & BIT_ULL(mbssid_index_ie[2]))
2355 /* We don't support legacy split of a profile */
2356 net_dbg_ratelimited("Partial info for BSSID index %d\n",
2357 mbssid_index_ie[2]);
2359 seen_indices |= BIT_ULL(mbssid_index_ie[2]);
2361 data.bssid_index = mbssid_index_ie[2];
2362 data.max_bssid_indicator = elem->data[0];
2364 cfg80211_gen_new_bssid(tx_data->bssid,
2365 data.max_bssid_indicator,
2369 memset(new_ie, 0, IEEE80211_MAX_DATA_LEN);
2371 data.ielen = cfg80211_gen_new_ie(tx_data->ie,
2376 IEEE80211_MAX_DATA_LEN);
2380 data.capability = get_unaligned_le16(profile + 2);
2381 bss = cfg80211_inform_single_bss_data(wiphy, &data, gfp);
2384 cfg80211_put_bss(wiphy, bss);
2393 ssize_t cfg80211_defragment_element(const struct element *elem, const u8 *ies,
2394 size_t ieslen, u8 *data, size_t data_len,
2397 const struct element *next;
2404 /* elem might be invalid after the memmove */
2405 next = (void *)(elem->data + elem->datalen);
2406 elem_datalen = elem->datalen;
2408 if (elem->id == WLAN_EID_EXTENSION) {
2409 copied = elem->datalen - 1;
2410 if (copied > data_len)
2413 memmove(data, elem->data + 1, copied);
2415 copied = elem->datalen;
2416 if (copied > data_len)
2419 memmove(data, elem->data, copied);
2422 /* Fragmented elements must have 255 bytes */
2423 if (elem_datalen < 255)
2427 elem->data < ies + ieslen &&
2428 elem->data + elem->datalen <= ies + ieslen;
2430 /* elem might be invalid after the memmove */
2431 next = (void *)(elem->data + elem->datalen);
2433 if (elem->id != frag_id)
2436 elem_datalen = elem->datalen;
2438 if (copied + elem_datalen > data_len)
2441 memmove(data + copied, elem->data, elem_datalen);
2442 copied += elem_datalen;
2444 /* Only the last fragment may be short */
2445 if (elem_datalen != 255)
2451 EXPORT_SYMBOL(cfg80211_defragment_element);
2453 struct cfg80211_mle {
2454 struct ieee80211_multi_link_elem *mle;
2455 struct ieee80211_mle_per_sta_profile
2456 *sta_prof[IEEE80211_MLD_MAX_NUM_LINKS];
2457 ssize_t sta_prof_len[IEEE80211_MLD_MAX_NUM_LINKS];
2462 static struct cfg80211_mle *
2463 cfg80211_defrag_mle(const struct element *mle, const u8 *ie, size_t ielen,
2466 const struct element *elem;
2467 struct cfg80211_mle *res;
2470 u8 common_size, idx;
2472 if (!mle || !ieee80211_mle_size_ok(mle->data + 1, mle->datalen - 1))
2475 /* Required length for first defragmentation */
2476 buf_len = mle->datalen - 1;
2477 for_each_element(elem, mle->data + mle->datalen,
2478 ielen - sizeof(*mle) + mle->datalen) {
2479 if (elem->id != WLAN_EID_FRAGMENT)
2482 buf_len += elem->datalen;
2485 res = kzalloc(struct_size(res, data, buf_len), gfp);
2489 mle_len = cfg80211_defragment_element(mle, ie, ielen,
2495 res->mle = (void *)res->data;
2497 /* Find the sub-element area in the buffer */
2498 common_size = ieee80211_mle_common_size((u8 *)res->mle);
2499 ie = res->data + common_size;
2500 ielen = mle_len - common_size;
2503 for_each_element_id(elem, IEEE80211_MLE_SUBELEM_PER_STA_PROFILE,
2505 res->sta_prof[idx] = (void *)elem->data;
2506 res->sta_prof_len[idx] = elem->datalen;
2509 if (idx >= IEEE80211_MLD_MAX_NUM_LINKS)
2512 if (!for_each_element_completed(elem, ie, ielen))
2515 /* Defragment sta_info in-place */
2516 for (idx = 0; idx < IEEE80211_MLD_MAX_NUM_LINKS && res->sta_prof[idx];
2518 if (res->sta_prof_len[idx] < 255)
2521 elem = (void *)res->sta_prof[idx] - 2;
2523 if (idx + 1 < ARRAY_SIZE(res->sta_prof) &&
2524 res->sta_prof[idx + 1])
2525 buf_len = (u8 *)res->sta_prof[idx + 1] -
2526 (u8 *)res->sta_prof[idx];
2528 buf_len = ielen + ie - (u8 *)elem;
2530 res->sta_prof_len[idx] =
2531 cfg80211_defragment_element(elem,
2532 (u8 *)elem, buf_len,
2533 (u8 *)res->sta_prof[idx],
2535 IEEE80211_MLE_SUBELEM_FRAGMENT);
2536 if (res->sta_prof_len[idx] < 0)
2548 cfg80211_tbtt_info_for_mld_ap(const u8 *ie, size_t ielen, u8 mld_id, u8 link_id,
2549 const struct ieee80211_neighbor_ap_info **ap_info,
2550 const u8 **tbtt_info)
2552 const struct ieee80211_neighbor_ap_info *info;
2553 const struct element *rnr;
2554 const u8 *pos, *end;
2556 for_each_element_id(rnr, WLAN_EID_REDUCED_NEIGHBOR_REPORT, ie, ielen) {
2558 end = rnr->data + rnr->datalen;
2560 /* RNR IE may contain more than one NEIGHBOR_AP_INFO */
2561 while (sizeof(*info) <= end - pos) {
2562 const struct ieee80211_rnr_mld_params *mld_params;
2564 u8 length, i, count, mld_params_offset;
2569 count = u8_get_bits(info->tbtt_info_hdr,
2570 IEEE80211_AP_INFO_TBTT_HDR_COUNT) + 1;
2571 length = info->tbtt_info_len;
2573 pos += sizeof(*info);
2575 if (count * length > end - pos)
2578 type = u8_get_bits(info->tbtt_info_hdr,
2579 IEEE80211_AP_INFO_TBTT_HDR_TYPE);
2581 if (type == IEEE80211_TBTT_INFO_TYPE_TBTT &&
2583 offsetofend(struct ieee80211_tbtt_info_ge_11,
2586 offsetof(struct ieee80211_tbtt_info_ge_11, mld_params);
2587 use_for = NL80211_BSS_USE_FOR_ALL;
2588 } else if (type == IEEE80211_TBTT_INFO_TYPE_MLD &&
2589 length >= sizeof(struct ieee80211_rnr_mld_params)) {
2590 mld_params_offset = 0;
2591 use_for = NL80211_BSS_USE_FOR_MLD_LINK;
2593 pos += count * length;
2597 for (i = 0; i < count; i++) {
2598 mld_params = (void *)pos + mld_params_offset;
2599 params = le16_to_cpu(mld_params->params);
2601 lid = u16_get_bits(params,
2602 IEEE80211_RNR_MLD_PARAMS_LINK_ID);
2604 if (mld_id == mld_params->mld_id &&
2621 cfg80211_parse_ml_elem_sta_data(struct wiphy *wiphy,
2622 struct cfg80211_inform_single_bss_data *tx_data,
2623 struct cfg80211_bss *source_bss,
2624 const struct element *elem,
2627 struct cfg80211_inform_single_bss_data data = {
2628 .drv_data = tx_data->drv_data,
2629 .ftype = tx_data->ftype,
2630 .source_bss = source_bss,
2631 .bss_source = BSS_SOURCE_STA_PROFILE,
2633 struct ieee80211_multi_link_elem *ml_elem;
2634 struct cfg80211_mle *mle;
2638 struct cfg80211_bss *bss;
2644 if (!ieee80211_mle_size_ok(elem->data + 1, elem->datalen - 1))
2647 ml_elem = (void *)elem->data + 1;
2648 control = le16_to_cpu(ml_elem->control);
2649 if (u16_get_bits(control, IEEE80211_ML_CONTROL_TYPE) !=
2650 IEEE80211_ML_CONTROL_TYPE_BASIC)
2653 /* Must be present when transmitted by an AP (in a probe response) */
2654 if (!(control & IEEE80211_MLC_BASIC_PRES_BSS_PARAM_CH_CNT) ||
2655 !(control & IEEE80211_MLC_BASIC_PRES_LINK_ID) ||
2656 !(control & IEEE80211_MLC_BASIC_PRES_MLD_CAPA_OP))
2659 ml_common_len = ml_elem->variable[0];
2661 /* length + MLD MAC address + link ID info + BSS Params Change Count */
2662 pos = ml_elem->variable + 1 + 6 + 1 + 1;
2664 if (u16_get_bits(control, IEEE80211_MLC_BASIC_PRES_MED_SYNC_DELAY))
2666 if (u16_get_bits(control, IEEE80211_MLC_BASIC_PRES_EML_CAPA))
2669 /* MLD capabilities and operations */
2673 * The MLD ID of the reporting AP is always zero. It is set if the AP
2674 * is part of an MBSSID set and will be non-zero for ML Elements
2675 * relating to a nontransmitted BSS (matching the Multi-BSSID Index,
2676 * Draft P802.11be_D3.2, 35.3.4.2)
2678 if (u16_get_bits(control, IEEE80211_MLC_BASIC_PRES_MLD_ID)) {
2685 /* Extended MLD capabilities and operations */
2688 /* Fully defrag the ML element for sta information/profile iteration */
2689 mle = cfg80211_defrag_mle(elem, tx_data->ie, tx_data->ielen, gfp);
2693 new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp);
2697 for (i = 0; i < ARRAY_SIZE(mle->sta_prof) && mle->sta_prof[i]; i++) {
2698 const struct ieee80211_neighbor_ap_info *ap_info;
2699 enum nl80211_band band;
2702 const u8 *tbtt_info;
2703 ssize_t profile_len;
2704 u8 link_id, use_for;
2706 if (!ieee80211_mle_basic_sta_prof_size_ok((u8 *)mle->sta_prof[i],
2707 mle->sta_prof_len[i]))
2710 control = le16_to_cpu(mle->sta_prof[i]->control);
2712 if (!(control & IEEE80211_MLE_STA_CONTROL_COMPLETE_PROFILE))
2715 link_id = u16_get_bits(control,
2716 IEEE80211_MLE_STA_CONTROL_LINK_ID);
2717 if (seen_links & BIT(link_id))
2719 seen_links |= BIT(link_id);
2721 if (!(control & IEEE80211_MLE_STA_CONTROL_BEACON_INT_PRESENT) ||
2722 !(control & IEEE80211_MLE_STA_CONTROL_TSF_OFFS_PRESENT) ||
2723 !(control & IEEE80211_MLE_STA_CONTROL_STA_MAC_ADDR_PRESENT))
2726 memcpy(data.bssid, mle->sta_prof[i]->variable, ETH_ALEN);
2727 data.beacon_interval =
2728 get_unaligned_le16(mle->sta_prof[i]->variable + 6);
2729 data.tsf = tx_data->tsf +
2730 get_unaligned_le64(mle->sta_prof[i]->variable + 8);
2732 /* sta_info_len counts itself */
2733 profile = mle->sta_prof[i]->variable +
2734 mle->sta_prof[i]->sta_info_len - 1;
2735 profile_len = (u8 *)mle->sta_prof[i] + mle->sta_prof_len[i] -
2738 if (profile_len < 2)
2741 data.capability = get_unaligned_le16(profile);
2745 /* Find in RNR to look up channel information */
2746 use_for = cfg80211_tbtt_info_for_mld_ap(tx_data->ie,
2749 &ap_info, &tbtt_info);
2753 /* We could sanity check the BSSID is included */
2755 if (!ieee80211_operating_class_to_band(ap_info->op_class,
2759 freq = ieee80211_channel_to_freq_khz(ap_info->channel, band);
2760 data.channel = ieee80211_get_channel_khz(wiphy, freq);
2762 if (use_for == NL80211_BSS_USE_FOR_MLD_LINK &&
2763 !(wiphy->flags & WIPHY_FLAG_SUPPORTS_NSTR_NONPRIMARY)) {
2765 data.cannot_use_reasons =
2766 NL80211_BSS_CANNOT_USE_NSTR_NONPRIMARY;
2768 data.use_for = use_for;
2770 /* Generate new elements */
2771 memset(new_ie, 0, IEEE80211_MAX_DATA_LEN);
2773 data.ielen = cfg80211_gen_new_ie(tx_data->ie, tx_data->ielen,
2774 profile, profile_len,
2776 IEEE80211_MAX_DATA_LEN);
2780 /* The generated elements do not contain:
2781 * - Basic ML element
2782 * - A TBTT entry in the RNR for the transmitting AP
2784 * This information is needed both internally and in userspace
2785 * as such, we should append it here.
2787 if (data.ielen + 3 + sizeof(*ml_elem) + ml_common_len >
2788 IEEE80211_MAX_DATA_LEN)
2791 /* Copy the Basic Multi-Link element including the common
2792 * information, and then fix up the link ID.
2793 * Note that the ML element length has been verified and we
2794 * also checked that it contains the link ID.
2796 new_ie[data.ielen++] = WLAN_EID_EXTENSION;
2797 new_ie[data.ielen++] = 1 + sizeof(*ml_elem) + ml_common_len;
2798 new_ie[data.ielen++] = WLAN_EID_EXT_EHT_MULTI_LINK;
2799 memcpy(new_ie + data.ielen, ml_elem,
2800 sizeof(*ml_elem) + ml_common_len);
2802 new_ie[data.ielen + sizeof(*ml_elem) + 1 + ETH_ALEN] = link_id;
2804 data.ielen += sizeof(*ml_elem) + ml_common_len;
2806 /* TODO: Add an RNR containing only the reporting AP */
2808 bss = cfg80211_inform_single_bss_data(wiphy, &data, gfp);
2811 cfg80211_put_bss(wiphy, bss);
2819 static void cfg80211_parse_ml_sta_data(struct wiphy *wiphy,
2820 struct cfg80211_inform_single_bss_data *tx_data,
2821 struct cfg80211_bss *source_bss,
2824 const struct element *elem;
2829 if (tx_data->ftype != CFG80211_BSS_FTYPE_PRESP)
2832 for_each_element_extid(elem, WLAN_EID_EXT_EHT_MULTI_LINK,
2833 tx_data->ie, tx_data->ielen)
2834 cfg80211_parse_ml_elem_sta_data(wiphy, tx_data, source_bss,
2838 struct cfg80211_bss *
2839 cfg80211_inform_bss_data(struct wiphy *wiphy,
2840 struct cfg80211_inform_bss *data,
2841 enum cfg80211_bss_frame_type ftype,
2842 const u8 *bssid, u64 tsf, u16 capability,
2843 u16 beacon_interval, const u8 *ie, size_t ielen,
2846 struct cfg80211_inform_single_bss_data inform_data = {
2850 .capability = capability,
2851 .beacon_interval = beacon_interval,
2854 .use_for = data->restrict_use ?
2856 NL80211_BSS_USE_FOR_ALL,
2857 .cannot_use_reasons = data->cannot_use_reasons,
2859 struct cfg80211_bss *res;
2861 memcpy(inform_data.bssid, bssid, ETH_ALEN);
2863 res = cfg80211_inform_single_bss_data(wiphy, &inform_data, gfp);
2867 cfg80211_parse_mbssid_data(wiphy, &inform_data, res, gfp);
2869 cfg80211_parse_ml_sta_data(wiphy, &inform_data, res, gfp);
2873 EXPORT_SYMBOL(cfg80211_inform_bss_data);
2875 static bool cfg80211_uhb_power_type_valid(const u8 *ie,
2879 const struct element *tmp;
2880 struct ieee80211_he_operation *he_oper;
2882 tmp = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie, ielen);
2883 if (tmp && tmp->datalen >= sizeof(*he_oper) + 1) {
2884 const struct ieee80211_he_6ghz_oper *he_6ghz_oper;
2886 he_oper = (void *)&tmp->data[1];
2887 he_6ghz_oper = ieee80211_he_6ghz_oper(he_oper);
2892 switch (u8_get_bits(he_6ghz_oper->control,
2893 IEEE80211_HE_6GHZ_OPER_CTRL_REG_INFO)) {
2894 case IEEE80211_6GHZ_CTRL_REG_LPI_AP:
2896 case IEEE80211_6GHZ_CTRL_REG_SP_AP:
2897 return !(flags & IEEE80211_CHAN_NO_UHB_AFC_CLIENT);
2898 case IEEE80211_6GHZ_CTRL_REG_VLP_AP:
2899 return !(flags & IEEE80211_CHAN_NO_UHB_VLP_CLIENT);
2905 /* cfg80211_inform_bss_width_frame helper */
2906 static struct cfg80211_bss *
2907 cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
2908 struct cfg80211_inform_bss *data,
2909 struct ieee80211_mgmt *mgmt, size_t len,
2912 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2913 struct cfg80211_internal_bss tmp = {}, *res;
2914 struct cfg80211_bss_ies *ies;
2915 struct ieee80211_channel *channel;
2917 struct ieee80211_ext *ext = NULL;
2918 u8 *bssid, *variable;
2919 u16 capability, beacon_int;
2920 size_t ielen, min_hdr_len = offsetof(struct ieee80211_mgmt,
2921 u.probe_resp.variable);
2924 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
2925 offsetof(struct ieee80211_mgmt, u.beacon.variable));
2927 trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len);
2932 if (WARN_ON(!wiphy))
2935 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
2936 (data->signal < 0 || data->signal > 100)))
2939 if (ieee80211_is_s1g_beacon(mgmt->frame_control)) {
2940 ext = (void *) mgmt;
2941 min_hdr_len = offsetof(struct ieee80211_ext, u.s1g_beacon);
2942 if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
2943 min_hdr_len = offsetof(struct ieee80211_ext,
2944 u.s1g_short_beacon.variable);
2947 if (WARN_ON(len < min_hdr_len))
2950 ielen = len - min_hdr_len;
2951 variable = mgmt->u.probe_resp.variable;
2953 if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
2954 variable = ext->u.s1g_short_beacon.variable;
2956 variable = ext->u.s1g_beacon.variable;
2959 channel = cfg80211_get_bss_channel(wiphy, variable, ielen, data->chan);
2963 if (channel->band == NL80211_BAND_6GHZ &&
2964 !cfg80211_uhb_power_type_valid(variable, ielen, channel->flags)) {
2965 data->restrict_use = 1;
2967 data->cannot_use_reasons =
2968 NL80211_BSS_CANNOT_USE_UHB_PWR_MISMATCH;
2972 const struct ieee80211_s1g_bcn_compat_ie *compat;
2973 const struct element *elem;
2975 elem = cfg80211_find_elem(WLAN_EID_S1G_BCN_COMPAT,
2979 if (elem->datalen < sizeof(*compat))
2981 compat = (void *)elem->data;
2982 bssid = ext->u.s1g_beacon.sa;
2983 capability = le16_to_cpu(compat->compat_info);
2984 beacon_int = le16_to_cpu(compat->beacon_int);
2986 bssid = mgmt->bssid;
2987 beacon_int = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
2988 capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
2991 if (channel->band == NL80211_BAND_60GHZ) {
2992 bss_type = capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
2993 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
2994 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
2995 regulatory_hint_found_beacon(wiphy, channel, gfp);
2997 if (capability & WLAN_CAPABILITY_ESS)
2998 regulatory_hint_found_beacon(wiphy, channel, gfp);
3001 ies = kzalloc(sizeof(*ies) + ielen, gfp);
3005 ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
3006 ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control) ||
3007 ieee80211_is_s1g_beacon(mgmt->frame_control);
3008 memcpy(ies->data, variable, ielen);
3010 if (ieee80211_is_probe_resp(mgmt->frame_control))
3011 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
3013 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
3014 rcu_assign_pointer(tmp.pub.ies, ies);
3016 memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
3017 tmp.pub.beacon_interval = beacon_int;
3018 tmp.pub.capability = capability;
3019 tmp.pub.channel = channel;
3020 tmp.pub.signal = data->signal;
3021 tmp.ts_boottime = data->boottime_ns;
3022 tmp.parent_tsf = data->parent_tsf;
3023 tmp.pub.chains = data->chains;
3024 memcpy(tmp.pub.chain_signal, data->chain_signal, IEEE80211_MAX_CHAINS);
3025 ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
3026 tmp.pub.use_for = data->restrict_use ?
3028 NL80211_BSS_USE_FOR_ALL;
3029 tmp.pub.cannot_use_reasons = data->cannot_use_reasons;
3031 signal_valid = data->chan == channel;
3032 spin_lock_bh(&rdev->bss_lock);
3033 res = __cfg80211_bss_update(rdev, &tmp, signal_valid, jiffies);
3037 rdev_inform_bss(rdev, &res->pub, ies, data->drv_data);
3039 spin_unlock_bh(&rdev->bss_lock);
3041 trace_cfg80211_return_bss(&res->pub);
3042 /* __cfg80211_bss_update gives us a referenced result */
3046 spin_unlock_bh(&rdev->bss_lock);
3050 struct cfg80211_bss *
3051 cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
3052 struct cfg80211_inform_bss *data,
3053 struct ieee80211_mgmt *mgmt, size_t len,
3056 struct cfg80211_inform_single_bss_data inform_data = {
3058 .ie = mgmt->u.probe_resp.variable,
3059 .ielen = len - offsetof(struct ieee80211_mgmt,
3060 u.probe_resp.variable),
3061 .use_for = data->restrict_use ?
3063 NL80211_BSS_USE_FOR_ALL,
3064 .cannot_use_reasons = data->cannot_use_reasons,
3066 struct cfg80211_bss *res;
3068 res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt,
3073 /* don't do any further MBSSID/ML handling for S1G */
3074 if (ieee80211_is_s1g_beacon(mgmt->frame_control))
3077 inform_data.ftype = ieee80211_is_beacon(mgmt->frame_control) ?
3078 CFG80211_BSS_FTYPE_BEACON : CFG80211_BSS_FTYPE_PRESP;
3079 memcpy(inform_data.bssid, mgmt->bssid, ETH_ALEN);
3080 inform_data.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
3081 inform_data.beacon_interval =
3082 le16_to_cpu(mgmt->u.probe_resp.beacon_int);
3084 /* process each non-transmitting bss */
3085 cfg80211_parse_mbssid_data(wiphy, &inform_data, res, gfp);
3087 cfg80211_parse_ml_sta_data(wiphy, &inform_data, res, gfp);
3091 EXPORT_SYMBOL(cfg80211_inform_bss_frame_data);
3093 void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
3095 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
3100 spin_lock_bh(&rdev->bss_lock);
3101 bss_ref_get(rdev, bss_from_pub(pub));
3102 spin_unlock_bh(&rdev->bss_lock);
3104 EXPORT_SYMBOL(cfg80211_ref_bss);
3106 void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
3108 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
3113 spin_lock_bh(&rdev->bss_lock);
3114 bss_ref_put(rdev, bss_from_pub(pub));
3115 spin_unlock_bh(&rdev->bss_lock);
3117 EXPORT_SYMBOL(cfg80211_put_bss);
3119 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
3121 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
3122 struct cfg80211_internal_bss *bss, *tmp1;
3123 struct cfg80211_bss *nontrans_bss, *tmp;
3128 bss = bss_from_pub(pub);
3130 spin_lock_bh(&rdev->bss_lock);
3131 if (list_empty(&bss->list))
3134 list_for_each_entry_safe(nontrans_bss, tmp,
3135 &pub->nontrans_list,
3137 tmp1 = bss_from_pub(nontrans_bss);
3138 if (__cfg80211_unlink_bss(rdev, tmp1))
3139 rdev->bss_generation++;
3142 if (__cfg80211_unlink_bss(rdev, bss))
3143 rdev->bss_generation++;
3145 spin_unlock_bh(&rdev->bss_lock);
3147 EXPORT_SYMBOL(cfg80211_unlink_bss);
3149 void cfg80211_bss_iter(struct wiphy *wiphy,
3150 struct cfg80211_chan_def *chandef,
3151 void (*iter)(struct wiphy *wiphy,
3152 struct cfg80211_bss *bss,
3156 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
3157 struct cfg80211_internal_bss *bss;
3159 spin_lock_bh(&rdev->bss_lock);
3161 list_for_each_entry(bss, &rdev->bss_list, list) {
3162 if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel,
3164 iter(wiphy, &bss->pub, iter_data);
3167 spin_unlock_bh(&rdev->bss_lock);
3169 EXPORT_SYMBOL(cfg80211_bss_iter);
3171 void cfg80211_update_assoc_bss_entry(struct wireless_dev *wdev,
3172 unsigned int link_id,
3173 struct ieee80211_channel *chan)
3175 struct wiphy *wiphy = wdev->wiphy;
3176 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
3177 struct cfg80211_internal_bss *cbss = wdev->links[link_id].client.current_bss;
3178 struct cfg80211_internal_bss *new = NULL;
3179 struct cfg80211_internal_bss *bss;
3180 struct cfg80211_bss *nontrans_bss;
3181 struct cfg80211_bss *tmp;
3183 spin_lock_bh(&rdev->bss_lock);
3186 * Some APs use CSA also for bandwidth changes, i.e., without actually
3187 * changing the control channel, so no need to update in such a case.
3189 if (cbss->pub.channel == chan)
3192 /* use transmitting bss */
3193 if (cbss->pub.transmitted_bss)
3194 cbss = bss_from_pub(cbss->pub.transmitted_bss);
3196 cbss->pub.channel = chan;
3198 list_for_each_entry(bss, &rdev->bss_list, list) {
3199 if (!cfg80211_bss_type_match(bss->pub.capability,
3200 bss->pub.channel->band,
3201 wdev->conn_bss_type))
3207 if (!cmp_bss(&bss->pub, &cbss->pub, BSS_CMP_REGULAR)) {
3214 /* to save time, update IEs for transmitting bss only */
3215 cfg80211_update_known_bss(rdev, cbss, new, false);
3216 new->pub.proberesp_ies = NULL;
3217 new->pub.beacon_ies = NULL;
3219 list_for_each_entry_safe(nontrans_bss, tmp,
3220 &new->pub.nontrans_list,
3222 bss = bss_from_pub(nontrans_bss);
3223 if (__cfg80211_unlink_bss(rdev, bss))
3224 rdev->bss_generation++;
3227 WARN_ON(atomic_read(&new->hold));
3228 if (!WARN_ON(!__cfg80211_unlink_bss(rdev, new)))
3229 rdev->bss_generation++;
3232 rb_erase(&cbss->rbn, &rdev->bss_tree);
3233 rb_insert_bss(rdev, cbss);
3234 rdev->bss_generation++;
3236 list_for_each_entry_safe(nontrans_bss, tmp,
3237 &cbss->pub.nontrans_list,
3239 bss = bss_from_pub(nontrans_bss);
3240 bss->pub.channel = chan;
3241 rb_erase(&bss->rbn, &rdev->bss_tree);
3242 rb_insert_bss(rdev, bss);
3243 rdev->bss_generation++;
3247 spin_unlock_bh(&rdev->bss_lock);
3250 #ifdef CONFIG_CFG80211_WEXT
3251 static struct cfg80211_registered_device *
3252 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
3254 struct cfg80211_registered_device *rdev;
3255 struct net_device *dev;
3259 dev = dev_get_by_index(net, ifindex);
3261 return ERR_PTR(-ENODEV);
3262 if (dev->ieee80211_ptr)
3263 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
3265 rdev = ERR_PTR(-ENODEV);
3270 int cfg80211_wext_siwscan(struct net_device *dev,
3271 struct iw_request_info *info,
3272 union iwreq_data *wrqu, char *extra)
3274 struct cfg80211_registered_device *rdev;
3275 struct wiphy *wiphy;
3276 struct iw_scan_req *wreq = NULL;
3277 struct cfg80211_scan_request *creq;
3278 int i, err, n_channels = 0;
3279 enum nl80211_band band;
3281 if (!netif_running(dev))
3284 if (wrqu->data.length == sizeof(struct iw_scan_req))
3285 wreq = (struct iw_scan_req *)extra;
3287 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
3290 return PTR_ERR(rdev);
3292 if (rdev->scan_req || rdev->scan_msg)
3295 wiphy = &rdev->wiphy;
3297 /* Determine number of channels, needed to allocate creq */
3298 if (wreq && wreq->num_channels)
3299 n_channels = wreq->num_channels;
3301 n_channels = ieee80211_get_num_supported_channels(wiphy);
3303 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
3304 n_channels * sizeof(void *),
3309 creq->wiphy = wiphy;
3310 creq->wdev = dev->ieee80211_ptr;
3311 /* SSIDs come after channels */
3312 creq->ssids = (void *)&creq->channels[n_channels];
3313 creq->n_channels = n_channels;
3315 creq->scan_start = jiffies;
3317 /* translate "Scan on frequencies" request */
3319 for (band = 0; band < NUM_NL80211_BANDS; band++) {
3322 if (!wiphy->bands[band])
3325 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
3326 /* ignore disabled channels */
3327 if (wiphy->bands[band]->channels[j].flags &
3328 IEEE80211_CHAN_DISABLED)
3331 /* If we have a wireless request structure and the
3332 * wireless request specifies frequencies, then search
3333 * for the matching hardware channel.
3335 if (wreq && wreq->num_channels) {
3337 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
3338 for (k = 0; k < wreq->num_channels; k++) {
3339 struct iw_freq *freq =
3340 &wreq->channel_list[k];
3342 cfg80211_wext_freq(freq);
3344 if (wext_freq == wiphy_freq)
3345 goto wext_freq_found;
3347 goto wext_freq_not_found;
3351 creq->channels[i] = &wiphy->bands[band]->channels[j];
3353 wext_freq_not_found: ;
3356 /* No channels found? */
3362 /* Set real number of channels specified in creq->channels[] */
3363 creq->n_channels = i;
3365 /* translate "Scan for SSID" request */
3367 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
3368 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
3372 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
3373 creq->ssids[0].ssid_len = wreq->essid_len;
3375 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
3379 for (i = 0; i < NUM_NL80211_BANDS; i++)
3380 if (wiphy->bands[i])
3381 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
3383 eth_broadcast_addr(creq->bssid);
3385 wiphy_lock(&rdev->wiphy);
3387 rdev->scan_req = creq;
3388 err = rdev_scan(rdev, creq);
3390 rdev->scan_req = NULL;
3391 /* creq will be freed below */
3393 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
3394 /* creq now owned by driver */
3398 wiphy_unlock(&rdev->wiphy);
3403 EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
3405 static char *ieee80211_scan_add_ies(struct iw_request_info *info,
3406 const struct cfg80211_bss_ies *ies,
3407 char *current_ev, char *end_buf)
3409 const u8 *pos, *end, *next;
3410 struct iw_event iwe;
3416 * If needed, fragment the IEs buffer (at IE boundaries) into short
3417 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
3420 end = pos + ies->len;
3422 while (end - pos > IW_GENERIC_IE_MAX) {
3423 next = pos + 2 + pos[1];
3424 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
3425 next = next + 2 + next[1];
3427 memset(&iwe, 0, sizeof(iwe));
3428 iwe.cmd = IWEVGENIE;
3429 iwe.u.data.length = next - pos;
3430 current_ev = iwe_stream_add_point_check(info, current_ev,
3433 if (IS_ERR(current_ev))
3439 memset(&iwe, 0, sizeof(iwe));
3440 iwe.cmd = IWEVGENIE;
3441 iwe.u.data.length = end - pos;
3442 current_ev = iwe_stream_add_point_check(info, current_ev,
3445 if (IS_ERR(current_ev))
3453 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
3454 struct cfg80211_internal_bss *bss, char *current_ev,
3457 const struct cfg80211_bss_ies *ies;
3458 struct iw_event iwe;
3463 bool ismesh = false;
3465 memset(&iwe, 0, sizeof(iwe));
3466 iwe.cmd = SIOCGIWAP;
3467 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
3468 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
3469 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
3471 if (IS_ERR(current_ev))
3474 memset(&iwe, 0, sizeof(iwe));
3475 iwe.cmd = SIOCGIWFREQ;
3476 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
3478 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
3480 if (IS_ERR(current_ev))
3483 memset(&iwe, 0, sizeof(iwe));
3484 iwe.cmd = SIOCGIWFREQ;
3485 iwe.u.freq.m = bss->pub.channel->center_freq;
3487 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
3489 if (IS_ERR(current_ev))
3492 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
3493 memset(&iwe, 0, sizeof(iwe));
3495 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
3496 IW_QUAL_NOISE_INVALID |
3497 IW_QUAL_QUAL_UPDATED;
3498 switch (wiphy->signal_type) {
3499 case CFG80211_SIGNAL_TYPE_MBM:
3500 sig = bss->pub.signal / 100;
3501 iwe.u.qual.level = sig;
3502 iwe.u.qual.updated |= IW_QUAL_DBM;
3503 if (sig < -110) /* rather bad */
3505 else if (sig > -40) /* perfect */
3507 /* will give a range of 0 .. 70 */
3508 iwe.u.qual.qual = sig + 110;
3510 case CFG80211_SIGNAL_TYPE_UNSPEC:
3511 iwe.u.qual.level = bss->pub.signal;
3512 /* will give range 0 .. 100 */
3513 iwe.u.qual.qual = bss->pub.signal;
3519 current_ev = iwe_stream_add_event_check(info, current_ev,
3522 if (IS_ERR(current_ev))
3526 memset(&iwe, 0, sizeof(iwe));
3527 iwe.cmd = SIOCGIWENCODE;
3528 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
3529 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
3531 iwe.u.data.flags = IW_ENCODE_DISABLED;
3532 iwe.u.data.length = 0;
3533 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
3535 if (IS_ERR(current_ev))
3539 ies = rcu_dereference(bss->pub.ies);
3545 if (ie[1] > rem - 2)
3550 memset(&iwe, 0, sizeof(iwe));
3551 iwe.cmd = SIOCGIWESSID;
3552 iwe.u.data.length = ie[1];
3553 iwe.u.data.flags = 1;
3554 current_ev = iwe_stream_add_point_check(info,
3558 if (IS_ERR(current_ev))
3561 case WLAN_EID_MESH_ID:
3562 memset(&iwe, 0, sizeof(iwe));
3563 iwe.cmd = SIOCGIWESSID;
3564 iwe.u.data.length = ie[1];
3565 iwe.u.data.flags = 1;
3566 current_ev = iwe_stream_add_point_check(info,
3570 if (IS_ERR(current_ev))
3573 case WLAN_EID_MESH_CONFIG:
3575 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
3578 memset(&iwe, 0, sizeof(iwe));
3579 iwe.cmd = IWEVCUSTOM;
3580 iwe.u.data.length = sprintf(buf,
3581 "Mesh Network Path Selection Protocol ID: 0x%02X",
3583 current_ev = iwe_stream_add_point_check(info,
3587 if (IS_ERR(current_ev))
3589 iwe.u.data.length = sprintf(buf,
3590 "Path Selection Metric ID: 0x%02X",
3592 current_ev = iwe_stream_add_point_check(info,
3596 if (IS_ERR(current_ev))
3598 iwe.u.data.length = sprintf(buf,
3599 "Congestion Control Mode ID: 0x%02X",
3601 current_ev = iwe_stream_add_point_check(info,
3605 if (IS_ERR(current_ev))
3607 iwe.u.data.length = sprintf(buf,
3608 "Synchronization ID: 0x%02X",
3610 current_ev = iwe_stream_add_point_check(info,
3614 if (IS_ERR(current_ev))
3616 iwe.u.data.length = sprintf(buf,
3617 "Authentication ID: 0x%02X",
3619 current_ev = iwe_stream_add_point_check(info,
3623 if (IS_ERR(current_ev))
3625 iwe.u.data.length = sprintf(buf,
3626 "Formation Info: 0x%02X",
3628 current_ev = iwe_stream_add_point_check(info,
3632 if (IS_ERR(current_ev))
3634 iwe.u.data.length = sprintf(buf,
3635 "Capabilities: 0x%02X",
3637 current_ev = iwe_stream_add_point_check(info,
3641 if (IS_ERR(current_ev))
3644 case WLAN_EID_SUPP_RATES:
3645 case WLAN_EID_EXT_SUPP_RATES:
3646 /* display all supported rates in readable format */
3647 p = current_ev + iwe_stream_lcp_len(info);
3649 memset(&iwe, 0, sizeof(iwe));
3650 iwe.cmd = SIOCGIWRATE;
3651 /* Those two flags are ignored... */
3652 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
3654 for (i = 0; i < ie[1]; i++) {
3655 iwe.u.bitrate.value =
3656 ((ie[i + 2] & 0x7f) * 500000);
3658 p = iwe_stream_add_value(info, current_ev, p,
3662 current_ev = ERR_PTR(-E2BIG);
3673 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
3675 memset(&iwe, 0, sizeof(iwe));
3676 iwe.cmd = SIOCGIWMODE;
3678 iwe.u.mode = IW_MODE_MESH;
3679 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
3680 iwe.u.mode = IW_MODE_MASTER;
3682 iwe.u.mode = IW_MODE_ADHOC;
3683 current_ev = iwe_stream_add_event_check(info, current_ev,
3686 if (IS_ERR(current_ev))
3690 memset(&iwe, 0, sizeof(iwe));
3691 iwe.cmd = IWEVCUSTOM;
3692 iwe.u.data.length = sprintf(buf, "tsf=%016llx",
3693 (unsigned long long)(ies->tsf));
3694 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
3696 if (IS_ERR(current_ev))
3698 memset(&iwe, 0, sizeof(iwe));
3699 iwe.cmd = IWEVCUSTOM;
3700 iwe.u.data.length = sprintf(buf, " Last beacon: %ums ago",
3701 elapsed_jiffies_msecs(bss->ts));
3702 current_ev = iwe_stream_add_point_check(info, current_ev,
3703 end_buf, &iwe, buf);
3704 if (IS_ERR(current_ev))
3707 current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
3715 static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
3716 struct iw_request_info *info,
3717 char *buf, size_t len)
3719 char *current_ev = buf;
3720 char *end_buf = buf + len;
3721 struct cfg80211_internal_bss *bss;
3724 spin_lock_bh(&rdev->bss_lock);
3725 cfg80211_bss_expire(rdev);
3727 list_for_each_entry(bss, &rdev->bss_list, list) {
3728 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
3732 current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
3733 current_ev, end_buf);
3734 if (IS_ERR(current_ev)) {
3735 err = PTR_ERR(current_ev);
3739 spin_unlock_bh(&rdev->bss_lock);
3743 return current_ev - buf;
3747 int cfg80211_wext_giwscan(struct net_device *dev,
3748 struct iw_request_info *info,
3749 union iwreq_data *wrqu, char *extra)
3751 struct iw_point *data = &wrqu->data;
3752 struct cfg80211_registered_device *rdev;
3755 if (!netif_running(dev))
3758 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
3761 return PTR_ERR(rdev);
3763 if (rdev->scan_req || rdev->scan_msg)
3766 res = ieee80211_scan_results(rdev, info, extra, data->length);
3775 EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan);