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);
1734 static void cfg80211_check_stuck_ecsa(struct cfg80211_registered_device *rdev,
1735 struct cfg80211_internal_bss *known,
1736 const struct cfg80211_bss_ies *old)
1738 const struct ieee80211_ext_chansw_ie *ecsa;
1739 const struct element *elem_new, *elem_old;
1740 const struct cfg80211_bss_ies *new, *bcn;
1742 if (known->pub.proberesp_ecsa_stuck)
1745 new = rcu_dereference_protected(known->pub.proberesp_ies,
1746 lockdep_is_held(&rdev->bss_lock));
1750 if (new->tsf - old->tsf < USEC_PER_SEC)
1753 elem_old = cfg80211_find_elem(WLAN_EID_EXT_CHANSWITCH_ANN,
1754 old->data, old->len);
1758 elem_new = cfg80211_find_elem(WLAN_EID_EXT_CHANSWITCH_ANN,
1759 new->data, new->len);
1763 bcn = rcu_dereference_protected(known->pub.beacon_ies,
1764 lockdep_is_held(&rdev->bss_lock));
1766 cfg80211_find_elem(WLAN_EID_EXT_CHANSWITCH_ANN,
1767 bcn->data, bcn->len))
1770 if (elem_new->datalen != elem_old->datalen)
1772 if (elem_new->datalen < sizeof(struct ieee80211_ext_chansw_ie))
1774 if (memcmp(elem_new->data, elem_old->data, elem_new->datalen))
1777 ecsa = (void *)elem_new->data;
1782 if (ecsa->new_ch_num !=
1783 ieee80211_frequency_to_channel(known->pub.channel->center_freq))
1786 known->pub.proberesp_ecsa_stuck = 1;
1790 cfg80211_update_known_bss(struct cfg80211_registered_device *rdev,
1791 struct cfg80211_internal_bss *known,
1792 struct cfg80211_internal_bss *new,
1795 lockdep_assert_held(&rdev->bss_lock);
1798 if (rcu_access_pointer(new->pub.proberesp_ies)) {
1799 const struct cfg80211_bss_ies *old;
1801 old = rcu_access_pointer(known->pub.proberesp_ies);
1803 rcu_assign_pointer(known->pub.proberesp_ies,
1804 new->pub.proberesp_ies);
1805 /* Override possible earlier Beacon frame IEs */
1806 rcu_assign_pointer(known->pub.ies,
1807 new->pub.proberesp_ies);
1809 cfg80211_check_stuck_ecsa(rdev, known, old);
1810 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1814 if (rcu_access_pointer(new->pub.beacon_ies)) {
1815 const struct cfg80211_bss_ies *old;
1817 if (known->pub.hidden_beacon_bss &&
1818 !list_empty(&known->hidden_list)) {
1819 const struct cfg80211_bss_ies *f;
1821 /* The known BSS struct is one of the probe
1822 * response members of a group, but we're
1823 * receiving a beacon (beacon_ies in the new
1824 * bss is used). This can only mean that the
1825 * AP changed its beacon from not having an
1826 * SSID to showing it, which is confusing so
1827 * drop this information.
1830 f = rcu_access_pointer(new->pub.beacon_ies);
1831 kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head);
1835 old = rcu_access_pointer(known->pub.beacon_ies);
1837 rcu_assign_pointer(known->pub.beacon_ies, new->pub.beacon_ies);
1839 /* Override IEs if they were from a beacon before */
1840 if (old == rcu_access_pointer(known->pub.ies))
1841 rcu_assign_pointer(known->pub.ies, new->pub.beacon_ies);
1843 cfg80211_update_hidden_bsses(known,
1844 rcu_access_pointer(new->pub.beacon_ies),
1848 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1851 known->pub.beacon_interval = new->pub.beacon_interval;
1853 /* don't update the signal if beacon was heard on
1857 known->pub.signal = new->pub.signal;
1858 known->pub.capability = new->pub.capability;
1859 known->ts = new->ts;
1860 known->ts_boottime = new->ts_boottime;
1861 known->parent_tsf = new->parent_tsf;
1862 known->pub.chains = new->pub.chains;
1863 memcpy(known->pub.chain_signal, new->pub.chain_signal,
1864 IEEE80211_MAX_CHAINS);
1865 ether_addr_copy(known->parent_bssid, new->parent_bssid);
1866 known->pub.max_bssid_indicator = new->pub.max_bssid_indicator;
1867 known->pub.bssid_index = new->pub.bssid_index;
1868 known->pub.use_for &= new->pub.use_for;
1869 known->pub.cannot_use_reasons = new->pub.cannot_use_reasons;
1874 /* Returned bss is reference counted and must be cleaned up appropriately. */
1875 static struct cfg80211_internal_bss *
1876 __cfg80211_bss_update(struct cfg80211_registered_device *rdev,
1877 struct cfg80211_internal_bss *tmp,
1878 bool signal_valid, unsigned long ts)
1880 struct cfg80211_internal_bss *found = NULL;
1881 struct cfg80211_bss_ies *ies;
1883 if (WARN_ON(!tmp->pub.channel))
1888 if (WARN_ON(!rcu_access_pointer(tmp->pub.ies)))
1891 found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR);
1894 if (!cfg80211_update_known_bss(rdev, found, tmp, signal_valid))
1897 struct cfg80211_internal_bss *new;
1898 struct cfg80211_internal_bss *hidden;
1901 * create a copy -- the "res" variable that is passed in
1902 * is allocated on the stack since it's not needed in the
1903 * more common case of an update
1905 new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size,
1909 memcpy(new, tmp, sizeof(*new));
1911 INIT_LIST_HEAD(&new->hidden_list);
1912 INIT_LIST_HEAD(&new->pub.nontrans_list);
1913 /* we'll set this later if it was non-NULL */
1914 new->pub.transmitted_bss = NULL;
1916 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
1917 hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
1919 hidden = rb_find_bss(rdev, tmp,
1922 new->pub.hidden_beacon_bss = &hidden->pub;
1923 list_add(&new->hidden_list,
1924 &hidden->hidden_list);
1927 ies = (void *)rcu_access_pointer(new->pub.beacon_ies);
1928 rcu_assign_pointer(new->pub.beacon_ies,
1929 hidden->pub.beacon_ies);
1931 kfree_rcu(ies, rcu_head);
1935 * Ok so we found a beacon, and don't have an entry. If
1936 * it's a beacon with hidden SSID, we might be in for an
1937 * expensive search for any probe responses that should
1938 * be grouped with this beacon for updates ...
1940 if (!cfg80211_combine_bsses(rdev, new)) {
1941 bss_ref_put(rdev, new);
1946 if (rdev->bss_entries >= bss_entries_limit &&
1947 !cfg80211_bss_expire_oldest(rdev)) {
1948 bss_ref_put(rdev, new);
1952 /* This must be before the call to bss_ref_get */
1953 if (tmp->pub.transmitted_bss) {
1954 new->pub.transmitted_bss = tmp->pub.transmitted_bss;
1955 bss_ref_get(rdev, bss_from_pub(tmp->pub.transmitted_bss));
1958 list_add_tail(&new->list, &rdev->bss_list);
1959 rdev->bss_entries++;
1960 rb_insert_bss(rdev, new);
1964 rdev->bss_generation++;
1965 bss_ref_get(rdev, found);
1970 ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
1972 kfree_rcu(ies, rcu_head);
1973 ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
1975 kfree_rcu(ies, rcu_head);
1980 struct cfg80211_internal_bss *
1981 cfg80211_bss_update(struct cfg80211_registered_device *rdev,
1982 struct cfg80211_internal_bss *tmp,
1983 bool signal_valid, unsigned long ts)
1985 struct cfg80211_internal_bss *res;
1987 spin_lock_bh(&rdev->bss_lock);
1988 res = __cfg80211_bss_update(rdev, tmp, signal_valid, ts);
1989 spin_unlock_bh(&rdev->bss_lock);
1994 int cfg80211_get_ies_channel_number(const u8 *ie, size_t ielen,
1995 enum nl80211_band band)
1997 const struct element *tmp;
1999 if (band == NL80211_BAND_6GHZ) {
2000 struct ieee80211_he_operation *he_oper;
2002 tmp = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie,
2004 if (tmp && tmp->datalen >= sizeof(*he_oper) &&
2005 tmp->datalen >= ieee80211_he_oper_size(&tmp->data[1])) {
2006 const struct ieee80211_he_6ghz_oper *he_6ghz_oper;
2008 he_oper = (void *)&tmp->data[1];
2010 he_6ghz_oper = ieee80211_he_6ghz_oper(he_oper);
2014 return he_6ghz_oper->primary;
2016 } else if (band == NL80211_BAND_S1GHZ) {
2017 tmp = cfg80211_find_elem(WLAN_EID_S1G_OPERATION, ie, ielen);
2018 if (tmp && tmp->datalen >= sizeof(struct ieee80211_s1g_oper_ie)) {
2019 struct ieee80211_s1g_oper_ie *s1gop = (void *)tmp->data;
2021 return s1gop->oper_ch;
2024 tmp = cfg80211_find_elem(WLAN_EID_DS_PARAMS, ie, ielen);
2025 if (tmp && tmp->datalen == 1)
2026 return tmp->data[0];
2028 tmp = cfg80211_find_elem(WLAN_EID_HT_OPERATION, ie, ielen);
2030 tmp->datalen >= sizeof(struct ieee80211_ht_operation)) {
2031 struct ieee80211_ht_operation *htop = (void *)tmp->data;
2033 return htop->primary_chan;
2039 EXPORT_SYMBOL(cfg80211_get_ies_channel_number);
2042 * Update RX channel information based on the available frame payload
2043 * information. This is mainly for the 2.4 GHz band where frames can be received
2044 * from neighboring channels and the Beacon frames use the DSSS Parameter Set
2045 * element to indicate the current (transmitting) channel, but this might also
2046 * be needed on other bands if RX frequency does not match with the actual
2047 * operating channel of a BSS, or if the AP reports a different primary channel.
2049 static struct ieee80211_channel *
2050 cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
2051 struct ieee80211_channel *channel)
2055 struct ieee80211_channel *alt_channel;
2057 channel_number = cfg80211_get_ies_channel_number(ie, ielen,
2060 if (channel_number < 0) {
2061 /* No channel information in frame payload */
2065 freq = ieee80211_channel_to_freq_khz(channel_number, channel->band);
2068 * Frame info (beacon/prob res) is the same as received channel,
2069 * no need for further processing.
2071 if (freq == ieee80211_channel_to_khz(channel))
2074 alt_channel = ieee80211_get_channel_khz(wiphy, freq);
2076 if (channel->band == NL80211_BAND_2GHZ ||
2077 channel->band == NL80211_BAND_6GHZ) {
2079 * Better not allow unexpected channels when that could
2080 * be going beyond the 1-11 range (e.g., discovering
2081 * BSS on channel 12 when radio is configured for
2082 * channel 11) or beyond the 6 GHz channel range.
2087 /* No match for the payload channel number - ignore it */
2092 * Use the channel determined through the payload channel number
2093 * instead of the RX channel reported by the driver.
2095 if (alt_channel->flags & IEEE80211_CHAN_DISABLED)
2100 struct cfg80211_inform_single_bss_data {
2101 struct cfg80211_inform_bss *drv_data;
2102 enum cfg80211_bss_frame_type ftype;
2103 struct ieee80211_channel *channel;
2107 u16 beacon_interval;
2112 BSS_SOURCE_DIRECT = 0,
2114 BSS_SOURCE_STA_PROFILE,
2116 /* Set if reporting bss_source != BSS_SOURCE_DIRECT */
2117 struct cfg80211_bss *source_bss;
2118 u8 max_bssid_indicator;
2122 u64 cannot_use_reasons;
2125 /* Returned bss is reference counted and must be cleaned up appropriately. */
2126 static struct cfg80211_bss *
2127 cfg80211_inform_single_bss_data(struct wiphy *wiphy,
2128 struct cfg80211_inform_single_bss_data *data,
2131 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2132 struct cfg80211_inform_bss *drv_data = data->drv_data;
2133 struct cfg80211_bss_ies *ies;
2134 struct ieee80211_channel *channel;
2135 struct cfg80211_internal_bss tmp = {}, *res;
2140 if (WARN_ON(!wiphy))
2143 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
2144 (drv_data->signal < 0 || drv_data->signal > 100)))
2147 if (WARN_ON(data->bss_source != BSS_SOURCE_DIRECT && !data->source_bss))
2150 channel = data->channel;
2152 channel = cfg80211_get_bss_channel(wiphy, data->ie, data->ielen,
2157 memcpy(tmp.pub.bssid, data->bssid, ETH_ALEN);
2158 tmp.pub.channel = channel;
2159 if (data->bss_source != BSS_SOURCE_STA_PROFILE)
2160 tmp.pub.signal = drv_data->signal;
2163 tmp.pub.beacon_interval = data->beacon_interval;
2164 tmp.pub.capability = data->capability;
2165 tmp.ts_boottime = drv_data->boottime_ns;
2166 tmp.parent_tsf = drv_data->parent_tsf;
2167 ether_addr_copy(tmp.parent_bssid, drv_data->parent_bssid);
2168 tmp.pub.use_for = data->use_for;
2169 tmp.pub.cannot_use_reasons = data->cannot_use_reasons;
2171 if (data->bss_source != BSS_SOURCE_DIRECT) {
2172 tmp.pub.transmitted_bss = data->source_bss;
2173 ts = bss_from_pub(data->source_bss)->ts;
2174 tmp.pub.bssid_index = data->bssid_index;
2175 tmp.pub.max_bssid_indicator = data->max_bssid_indicator;
2179 if (channel->band == NL80211_BAND_60GHZ) {
2180 bss_type = data->capability &
2181 WLAN_CAPABILITY_DMG_TYPE_MASK;
2182 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
2183 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
2184 regulatory_hint_found_beacon(wiphy, channel,
2187 if (data->capability & WLAN_CAPABILITY_ESS)
2188 regulatory_hint_found_beacon(wiphy, channel,
2194 * If we do not know here whether the IEs are from a Beacon or Probe
2195 * Response frame, we need to pick one of the options and only use it
2196 * with the driver that does not provide the full Beacon/Probe Response
2197 * frame. Use Beacon frame pointer to avoid indicating that this should
2198 * override the IEs pointer should we have received an earlier
2199 * indication of Probe Response data.
2201 ies = kzalloc(sizeof(*ies) + data->ielen, gfp);
2204 ies->len = data->ielen;
2205 ies->tsf = data->tsf;
2206 ies->from_beacon = false;
2207 memcpy(ies->data, data->ie, data->ielen);
2209 switch (data->ftype) {
2210 case CFG80211_BSS_FTYPE_BEACON:
2211 ies->from_beacon = true;
2213 case CFG80211_BSS_FTYPE_UNKNOWN:
2214 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
2216 case CFG80211_BSS_FTYPE_PRESP:
2217 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
2220 rcu_assign_pointer(tmp.pub.ies, ies);
2222 signal_valid = drv_data->chan == channel;
2223 spin_lock_bh(&rdev->bss_lock);
2224 res = __cfg80211_bss_update(rdev, &tmp, signal_valid, ts);
2228 rdev_inform_bss(rdev, &res->pub, ies, drv_data->drv_data);
2230 if (data->bss_source == BSS_SOURCE_MBSSID) {
2231 /* this is a nontransmitting bss, we need to add it to
2232 * transmitting bss' list if it is not there
2234 if (cfg80211_add_nontrans_list(data->source_bss, &res->pub)) {
2235 if (__cfg80211_unlink_bss(rdev, res)) {
2236 rdev->bss_generation++;
2244 spin_unlock_bh(&rdev->bss_lock);
2246 trace_cfg80211_return_bss(&res->pub);
2247 /* __cfg80211_bss_update gives us a referenced result */
2251 spin_unlock_bh(&rdev->bss_lock);
2255 static const struct element
2256 *cfg80211_get_profile_continuation(const u8 *ie, size_t ielen,
2257 const struct element *mbssid_elem,
2258 const struct element *sub_elem)
2260 const u8 *mbssid_end = mbssid_elem->data + mbssid_elem->datalen;
2261 const struct element *next_mbssid;
2262 const struct element *next_sub;
2264 next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID,
2266 ielen - (mbssid_end - ie));
2269 * If it is not the last subelement in current MBSSID IE or there isn't
2270 * a next MBSSID IE - profile is complete.
2272 if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) ||
2276 /* For any length error, just return NULL */
2278 if (next_mbssid->datalen < 4)
2281 next_sub = (void *)&next_mbssid->data[1];
2283 if (next_mbssid->data + next_mbssid->datalen <
2284 next_sub->data + next_sub->datalen)
2287 if (next_sub->id != 0 || next_sub->datalen < 2)
2291 * Check if the first element in the next sub element is a start
2294 return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ?
2298 size_t cfg80211_merge_profile(const u8 *ie, size_t ielen,
2299 const struct element *mbssid_elem,
2300 const struct element *sub_elem,
2301 u8 *merged_ie, size_t max_copy_len)
2303 size_t copied_len = sub_elem->datalen;
2304 const struct element *next_mbssid;
2306 if (sub_elem->datalen > max_copy_len)
2309 memcpy(merged_ie, sub_elem->data, sub_elem->datalen);
2311 while ((next_mbssid = cfg80211_get_profile_continuation(ie, ielen,
2314 const struct element *next_sub = (void *)&next_mbssid->data[1];
2316 if (copied_len + next_sub->datalen > max_copy_len)
2318 memcpy(merged_ie + copied_len, next_sub->data,
2320 copied_len += next_sub->datalen;
2325 EXPORT_SYMBOL(cfg80211_merge_profile);
2328 cfg80211_parse_mbssid_data(struct wiphy *wiphy,
2329 struct cfg80211_inform_single_bss_data *tx_data,
2330 struct cfg80211_bss *source_bss,
2333 struct cfg80211_inform_single_bss_data data = {
2334 .drv_data = tx_data->drv_data,
2335 .ftype = tx_data->ftype,
2336 .tsf = tx_data->tsf,
2337 .beacon_interval = tx_data->beacon_interval,
2338 .source_bss = source_bss,
2339 .bss_source = BSS_SOURCE_MBSSID,
2340 .use_for = tx_data->use_for,
2341 .cannot_use_reasons = tx_data->cannot_use_reasons,
2343 const u8 *mbssid_index_ie;
2344 const struct element *elem, *sub;
2345 u8 *new_ie, *profile;
2346 u64 seen_indices = 0;
2347 struct cfg80211_bss *bss;
2351 if (!cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID,
2352 tx_data->ie, tx_data->ielen))
2354 if (!wiphy->support_mbssid)
2356 if (wiphy->support_only_he_mbssid &&
2357 !cfg80211_find_ext_elem(WLAN_EID_EXT_HE_CAPABILITY,
2358 tx_data->ie, tx_data->ielen))
2361 new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp);
2365 profile = kmalloc(tx_data->ielen, gfp);
2369 for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID,
2370 tx_data->ie, tx_data->ielen) {
2371 if (elem->datalen < 4)
2373 if (elem->data[0] < 1 || (int)elem->data[0] > 8)
2375 for_each_element(sub, elem->data + 1, elem->datalen - 1) {
2378 if (sub->id != 0 || sub->datalen < 4) {
2379 /* not a valid BSS profile */
2383 if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP ||
2384 sub->data[1] != 2) {
2385 /* The first element within the Nontransmitted
2386 * BSSID Profile is not the Nontransmitted
2387 * BSSID Capability element.
2392 memset(profile, 0, tx_data->ielen);
2393 profile_len = cfg80211_merge_profile(tx_data->ie,
2400 /* found a Nontransmitted BSSID Profile */
2401 mbssid_index_ie = cfg80211_find_ie
2402 (WLAN_EID_MULTI_BSSID_IDX,
2403 profile, profile_len);
2404 if (!mbssid_index_ie || mbssid_index_ie[1] < 1 ||
2405 mbssid_index_ie[2] == 0 ||
2406 mbssid_index_ie[2] > 46) {
2407 /* No valid Multiple BSSID-Index element */
2411 if (seen_indices & BIT_ULL(mbssid_index_ie[2]))
2412 /* We don't support legacy split of a profile */
2413 net_dbg_ratelimited("Partial info for BSSID index %d\n",
2414 mbssid_index_ie[2]);
2416 seen_indices |= BIT_ULL(mbssid_index_ie[2]);
2418 data.bssid_index = mbssid_index_ie[2];
2419 data.max_bssid_indicator = elem->data[0];
2421 cfg80211_gen_new_bssid(tx_data->bssid,
2422 data.max_bssid_indicator,
2426 memset(new_ie, 0, IEEE80211_MAX_DATA_LEN);
2428 data.ielen = cfg80211_gen_new_ie(tx_data->ie,
2433 IEEE80211_MAX_DATA_LEN);
2437 data.capability = get_unaligned_le16(profile + 2);
2438 bss = cfg80211_inform_single_bss_data(wiphy, &data, gfp);
2441 cfg80211_put_bss(wiphy, bss);
2450 ssize_t cfg80211_defragment_element(const struct element *elem, const u8 *ies,
2451 size_t ieslen, u8 *data, size_t data_len,
2454 const struct element *next;
2461 /* elem might be invalid after the memmove */
2462 next = (void *)(elem->data + elem->datalen);
2463 elem_datalen = elem->datalen;
2465 if (elem->id == WLAN_EID_EXTENSION) {
2466 copied = elem->datalen - 1;
2467 if (copied > data_len)
2470 memmove(data, elem->data + 1, copied);
2472 copied = elem->datalen;
2473 if (copied > data_len)
2476 memmove(data, elem->data, copied);
2479 /* Fragmented elements must have 255 bytes */
2480 if (elem_datalen < 255)
2484 elem->data < ies + ieslen &&
2485 elem->data + elem->datalen <= ies + ieslen;
2487 /* elem might be invalid after the memmove */
2488 next = (void *)(elem->data + elem->datalen);
2490 if (elem->id != frag_id)
2493 elem_datalen = elem->datalen;
2495 if (copied + elem_datalen > data_len)
2498 memmove(data + copied, elem->data, elem_datalen);
2499 copied += elem_datalen;
2501 /* Only the last fragment may be short */
2502 if (elem_datalen != 255)
2508 EXPORT_SYMBOL(cfg80211_defragment_element);
2510 struct cfg80211_mle {
2511 struct ieee80211_multi_link_elem *mle;
2512 struct ieee80211_mle_per_sta_profile
2513 *sta_prof[IEEE80211_MLD_MAX_NUM_LINKS];
2514 ssize_t sta_prof_len[IEEE80211_MLD_MAX_NUM_LINKS];
2519 static struct cfg80211_mle *
2520 cfg80211_defrag_mle(const struct element *mle, const u8 *ie, size_t ielen,
2523 const struct element *elem;
2524 struct cfg80211_mle *res;
2527 u8 common_size, idx;
2529 if (!mle || !ieee80211_mle_size_ok(mle->data + 1, mle->datalen - 1))
2532 /* Required length for first defragmentation */
2533 buf_len = mle->datalen - 1;
2534 for_each_element(elem, mle->data + mle->datalen,
2535 ielen - sizeof(*mle) + mle->datalen) {
2536 if (elem->id != WLAN_EID_FRAGMENT)
2539 buf_len += elem->datalen;
2542 res = kzalloc(struct_size(res, data, buf_len), gfp);
2546 mle_len = cfg80211_defragment_element(mle, ie, ielen,
2552 res->mle = (void *)res->data;
2554 /* Find the sub-element area in the buffer */
2555 common_size = ieee80211_mle_common_size((u8 *)res->mle);
2556 ie = res->data + common_size;
2557 ielen = mle_len - common_size;
2560 for_each_element_id(elem, IEEE80211_MLE_SUBELEM_PER_STA_PROFILE,
2562 res->sta_prof[idx] = (void *)elem->data;
2563 res->sta_prof_len[idx] = elem->datalen;
2566 if (idx >= IEEE80211_MLD_MAX_NUM_LINKS)
2569 if (!for_each_element_completed(elem, ie, ielen))
2572 /* Defragment sta_info in-place */
2573 for (idx = 0; idx < IEEE80211_MLD_MAX_NUM_LINKS && res->sta_prof[idx];
2575 if (res->sta_prof_len[idx] < 255)
2578 elem = (void *)res->sta_prof[idx] - 2;
2580 if (idx + 1 < ARRAY_SIZE(res->sta_prof) &&
2581 res->sta_prof[idx + 1])
2582 buf_len = (u8 *)res->sta_prof[idx + 1] -
2583 (u8 *)res->sta_prof[idx];
2585 buf_len = ielen + ie - (u8 *)elem;
2587 res->sta_prof_len[idx] =
2588 cfg80211_defragment_element(elem,
2589 (u8 *)elem, buf_len,
2590 (u8 *)res->sta_prof[idx],
2592 IEEE80211_MLE_SUBELEM_FRAGMENT);
2593 if (res->sta_prof_len[idx] < 0)
2605 cfg80211_rnr_info_for_mld_ap(const u8 *ie, size_t ielen, u8 mld_id, u8 link_id,
2606 const struct ieee80211_neighbor_ap_info **ap_info,
2609 const struct ieee80211_neighbor_ap_info *info;
2610 const struct element *rnr;
2611 const u8 *pos, *end;
2613 for_each_element_id(rnr, WLAN_EID_REDUCED_NEIGHBOR_REPORT, ie, ielen) {
2615 end = rnr->data + rnr->datalen;
2617 /* RNR IE may contain more than one NEIGHBOR_AP_INFO */
2618 while (sizeof(*info) <= end - pos) {
2619 const struct ieee80211_rnr_mld_params *mld_params;
2621 u8 length, i, count, mld_params_offset;
2626 count = u8_get_bits(info->tbtt_info_hdr,
2627 IEEE80211_AP_INFO_TBTT_HDR_COUNT) + 1;
2628 length = info->tbtt_info_len;
2630 pos += sizeof(*info);
2632 if (count * length > end - pos)
2635 type = u8_get_bits(info->tbtt_info_hdr,
2636 IEEE80211_AP_INFO_TBTT_HDR_TYPE);
2638 if (type == IEEE80211_TBTT_INFO_TYPE_TBTT &&
2640 offsetofend(struct ieee80211_tbtt_info_ge_11,
2643 offsetof(struct ieee80211_tbtt_info_ge_11, mld_params);
2644 use_for = NL80211_BSS_USE_FOR_ALL;
2645 } else if (type == IEEE80211_TBTT_INFO_TYPE_MLD &&
2646 length >= sizeof(struct ieee80211_rnr_mld_params)) {
2647 mld_params_offset = 0;
2648 use_for = NL80211_BSS_USE_FOR_MLD_LINK;
2650 pos += count * length;
2654 for (i = 0; i < count; i++) {
2655 mld_params = (void *)pos + mld_params_offset;
2656 params = le16_to_cpu(mld_params->params);
2658 lid = u16_get_bits(params,
2659 IEEE80211_RNR_MLD_PARAMS_LINK_ID);
2661 if (mld_id == mld_params->mld_id &&
2665 le16_get_bits(mld_params->params,
2666 IEEE80211_RNR_MLD_PARAMS_BSS_CHANGE_COUNT);
2679 static struct element *
2680 cfg80211_gen_reporter_rnr(struct cfg80211_bss *source_bss, bool is_mbssid,
2681 bool same_mld, u8 link_id, u8 bss_change_count,
2684 const struct cfg80211_bss_ies *ies;
2685 struct ieee80211_neighbor_ap_info ap_info;
2686 struct ieee80211_tbtt_info_ge_11 tbtt_info;
2688 const struct element *elem;
2689 struct element *res;
2692 * We only generate the RNR to permit ML lookups. For that we do not
2693 * need an entry for the corresponding transmitting BSS, lets just skip
2694 * it even though it would be easy to add.
2699 /* We could use tx_data->ies if we change cfg80211_calc_short_ssid */
2701 ies = rcu_dereference(source_bss->ies);
2703 ap_info.tbtt_info_len = offsetofend(typeof(tbtt_info), mld_params);
2704 ap_info.tbtt_info_hdr =
2705 u8_encode_bits(IEEE80211_TBTT_INFO_TYPE_TBTT,
2706 IEEE80211_AP_INFO_TBTT_HDR_TYPE) |
2707 u8_encode_bits(0, IEEE80211_AP_INFO_TBTT_HDR_COUNT);
2709 ap_info.channel = ieee80211_frequency_to_channel(source_bss->channel->center_freq);
2711 /* operating class */
2712 elem = cfg80211_find_elem(WLAN_EID_SUPPORTED_REGULATORY_CLASSES,
2713 ies->data, ies->len);
2714 if (elem && elem->datalen >= 1) {
2715 ap_info.op_class = elem->data[0];
2717 struct cfg80211_chan_def chandef;
2719 /* The AP is not providing us with anything to work with. So
2720 * make up a somewhat reasonable operating class, but don't
2721 * bother with it too much as no one will ever use the
2724 cfg80211_chandef_create(&chandef, source_bss->channel,
2725 NL80211_CHAN_NO_HT);
2727 if (!ieee80211_chandef_to_operating_class(&chandef,
2732 /* Just set TBTT offset and PSD 20 to invalid/unknown */
2733 tbtt_info.tbtt_offset = 255;
2734 tbtt_info.psd_20 = IEEE80211_RNR_TBTT_PARAMS_PSD_RESERVED;
2736 memcpy(tbtt_info.bssid, source_bss->bssid, ETH_ALEN);
2737 if (cfg80211_calc_short_ssid(ies, &elem, &short_ssid))
2742 tbtt_info.short_ssid = cpu_to_le32(short_ssid);
2744 tbtt_info.bss_params = IEEE80211_RNR_TBTT_PARAMS_SAME_SSID;
2747 tbtt_info.bss_params |= IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID;
2748 tbtt_info.bss_params |= IEEE80211_RNR_TBTT_PARAMS_TRANSMITTED_BSSID;
2751 tbtt_info.mld_params.mld_id = 0;
2752 tbtt_info.mld_params.params =
2753 le16_encode_bits(link_id, IEEE80211_RNR_MLD_PARAMS_LINK_ID) |
2754 le16_encode_bits(bss_change_count,
2755 IEEE80211_RNR_MLD_PARAMS_BSS_CHANGE_COUNT);
2757 res = kzalloc(struct_size(res, data,
2758 sizeof(ap_info) + ap_info.tbtt_info_len),
2764 res->id = WLAN_EID_REDUCED_NEIGHBOR_REPORT;
2765 res->datalen = sizeof(ap_info) + ap_info.tbtt_info_len;
2766 memcpy(res->data, &ap_info, sizeof(ap_info));
2767 memcpy(res->data + sizeof(ap_info), &tbtt_info, ap_info.tbtt_info_len);
2777 cfg80211_parse_ml_elem_sta_data(struct wiphy *wiphy,
2778 struct cfg80211_inform_single_bss_data *tx_data,
2779 struct cfg80211_bss *source_bss,
2780 const struct element *elem,
2783 struct cfg80211_inform_single_bss_data data = {
2784 .drv_data = tx_data->drv_data,
2785 .ftype = tx_data->ftype,
2786 .source_bss = source_bss,
2787 .bss_source = BSS_SOURCE_STA_PROFILE,
2789 struct element *reporter_rnr = NULL;
2790 struct ieee80211_multi_link_elem *ml_elem;
2791 struct cfg80211_mle *mle;
2795 struct cfg80211_bss *bss;
2796 u8 mld_id, reporter_link_id, bss_change_count;
2801 if (!ieee80211_mle_size_ok(elem->data + 1, elem->datalen - 1))
2804 ml_elem = (void *)elem->data + 1;
2805 control = le16_to_cpu(ml_elem->control);
2806 if (u16_get_bits(control, IEEE80211_ML_CONTROL_TYPE) !=
2807 IEEE80211_ML_CONTROL_TYPE_BASIC)
2810 /* Must be present when transmitted by an AP (in a probe response) */
2811 if (!(control & IEEE80211_MLC_BASIC_PRES_BSS_PARAM_CH_CNT) ||
2812 !(control & IEEE80211_MLC_BASIC_PRES_LINK_ID) ||
2813 !(control & IEEE80211_MLC_BASIC_PRES_MLD_CAPA_OP))
2816 ml_common_len = ml_elem->variable[0];
2818 /* length + MLD MAC address */
2819 pos = ml_elem->variable + 1 + 6;
2821 reporter_link_id = pos[0];
2824 bss_change_count = pos[0];
2827 if (u16_get_bits(control, IEEE80211_MLC_BASIC_PRES_MED_SYNC_DELAY))
2829 if (u16_get_bits(control, IEEE80211_MLC_BASIC_PRES_EML_CAPA))
2832 /* MLD capabilities and operations */
2836 * The MLD ID of the reporting AP is always zero. It is set if the AP
2837 * is part of an MBSSID set and will be non-zero for ML Elements
2838 * relating to a nontransmitted BSS (matching the Multi-BSSID Index,
2839 * Draft P802.11be_D3.2, 35.3.4.2)
2841 if (u16_get_bits(control, IEEE80211_MLC_BASIC_PRES_MLD_ID)) {
2848 /* Extended MLD capabilities and operations */
2851 /* Fully defrag the ML element for sta information/profile iteration */
2852 mle = cfg80211_defrag_mle(elem, tx_data->ie, tx_data->ielen, gfp);
2856 /* No point in doing anything if there is no per-STA profile */
2857 if (!mle->sta_prof[0])
2860 new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp);
2864 reporter_rnr = cfg80211_gen_reporter_rnr(source_bss,
2865 u16_get_bits(control,
2866 IEEE80211_MLC_BASIC_PRES_MLD_ID),
2867 mld_id == 0, reporter_link_id,
2871 for (i = 0; i < ARRAY_SIZE(mle->sta_prof) && mle->sta_prof[i]; i++) {
2872 const struct ieee80211_neighbor_ap_info *ap_info;
2873 enum nl80211_band band;
2876 ssize_t profile_len;
2878 u8 link_id, use_for;
2880 if (!ieee80211_mle_basic_sta_prof_size_ok((u8 *)mle->sta_prof[i],
2881 mle->sta_prof_len[i]))
2884 control = le16_to_cpu(mle->sta_prof[i]->control);
2886 if (!(control & IEEE80211_MLE_STA_CONTROL_COMPLETE_PROFILE))
2889 link_id = u16_get_bits(control,
2890 IEEE80211_MLE_STA_CONTROL_LINK_ID);
2891 if (seen_links & BIT(link_id))
2893 seen_links |= BIT(link_id);
2895 if (!(control & IEEE80211_MLE_STA_CONTROL_BEACON_INT_PRESENT) ||
2896 !(control & IEEE80211_MLE_STA_CONTROL_TSF_OFFS_PRESENT) ||
2897 !(control & IEEE80211_MLE_STA_CONTROL_STA_MAC_ADDR_PRESENT))
2900 memcpy(data.bssid, mle->sta_prof[i]->variable, ETH_ALEN);
2901 data.beacon_interval =
2902 get_unaligned_le16(mle->sta_prof[i]->variable + 6);
2903 data.tsf = tx_data->tsf +
2904 get_unaligned_le64(mle->sta_prof[i]->variable + 8);
2906 /* sta_info_len counts itself */
2907 profile = mle->sta_prof[i]->variable +
2908 mle->sta_prof[i]->sta_info_len - 1;
2909 profile_len = (u8 *)mle->sta_prof[i] + mle->sta_prof_len[i] -
2912 if (profile_len < 2)
2915 data.capability = get_unaligned_le16(profile);
2919 /* Find in RNR to look up channel information */
2920 use_for = cfg80211_rnr_info_for_mld_ap(tx_data->ie,
2928 /* We could sanity check the BSSID is included */
2930 if (!ieee80211_operating_class_to_band(ap_info->op_class,
2934 freq = ieee80211_channel_to_freq_khz(ap_info->channel, band);
2935 data.channel = ieee80211_get_channel_khz(wiphy, freq);
2937 if (use_for == NL80211_BSS_USE_FOR_MLD_LINK &&
2938 !(wiphy->flags & WIPHY_FLAG_SUPPORTS_NSTR_NONPRIMARY)) {
2940 data.cannot_use_reasons =
2941 NL80211_BSS_CANNOT_USE_NSTR_NONPRIMARY;
2943 data.use_for = use_for;
2945 /* Generate new elements */
2946 memset(new_ie, 0, IEEE80211_MAX_DATA_LEN);
2948 data.ielen = cfg80211_gen_new_ie(tx_data->ie, tx_data->ielen,
2949 profile, profile_len,
2951 IEEE80211_MAX_DATA_LEN);
2955 /* The generated elements do not contain:
2956 * - Basic ML element
2957 * - A TBTT entry in the RNR for the transmitting AP
2959 * This information is needed both internally and in userspace
2960 * as such, we should append it here.
2962 if (data.ielen + 3 + sizeof(*ml_elem) + ml_common_len >
2963 IEEE80211_MAX_DATA_LEN)
2966 /* Copy the Basic Multi-Link element including the common
2967 * information, and then fix up the link ID and BSS param
2969 * Note that the ML element length has been verified and we
2970 * also checked that it contains the link ID.
2972 new_ie[data.ielen++] = WLAN_EID_EXTENSION;
2973 new_ie[data.ielen++] = 1 + sizeof(*ml_elem) + ml_common_len;
2974 new_ie[data.ielen++] = WLAN_EID_EXT_EHT_MULTI_LINK;
2975 memcpy(new_ie + data.ielen, ml_elem,
2976 sizeof(*ml_elem) + ml_common_len);
2978 new_ie[data.ielen + sizeof(*ml_elem) + 1 + ETH_ALEN] = link_id;
2979 new_ie[data.ielen + sizeof(*ml_elem) + 1 + ETH_ALEN + 1] =
2982 data.ielen += sizeof(*ml_elem) + ml_common_len;
2984 if (reporter_rnr && (use_for & NL80211_BSS_USE_FOR_NORMAL)) {
2985 if (data.ielen + sizeof(struct element) +
2986 reporter_rnr->datalen > IEEE80211_MAX_DATA_LEN)
2989 memcpy(new_ie + data.ielen, reporter_rnr,
2990 sizeof(struct element) + reporter_rnr->datalen);
2991 data.ielen += sizeof(struct element) +
2992 reporter_rnr->datalen;
2995 bss = cfg80211_inform_single_bss_data(wiphy, &data, gfp);
2998 cfg80211_put_bss(wiphy, bss);
3002 kfree(reporter_rnr);
3007 static void cfg80211_parse_ml_sta_data(struct wiphy *wiphy,
3008 struct cfg80211_inform_single_bss_data *tx_data,
3009 struct cfg80211_bss *source_bss,
3012 const struct element *elem;
3017 if (tx_data->ftype != CFG80211_BSS_FTYPE_PRESP)
3020 for_each_element_extid(elem, WLAN_EID_EXT_EHT_MULTI_LINK,
3021 tx_data->ie, tx_data->ielen)
3022 cfg80211_parse_ml_elem_sta_data(wiphy, tx_data, source_bss,
3026 struct cfg80211_bss *
3027 cfg80211_inform_bss_data(struct wiphy *wiphy,
3028 struct cfg80211_inform_bss *data,
3029 enum cfg80211_bss_frame_type ftype,
3030 const u8 *bssid, u64 tsf, u16 capability,
3031 u16 beacon_interval, const u8 *ie, size_t ielen,
3034 struct cfg80211_inform_single_bss_data inform_data = {
3038 .capability = capability,
3039 .beacon_interval = beacon_interval,
3042 .use_for = data->restrict_use ?
3044 NL80211_BSS_USE_FOR_ALL,
3045 .cannot_use_reasons = data->cannot_use_reasons,
3047 struct cfg80211_bss *res;
3049 memcpy(inform_data.bssid, bssid, ETH_ALEN);
3051 res = cfg80211_inform_single_bss_data(wiphy, &inform_data, gfp);
3055 cfg80211_parse_mbssid_data(wiphy, &inform_data, res, gfp);
3057 cfg80211_parse_ml_sta_data(wiphy, &inform_data, res, gfp);
3061 EXPORT_SYMBOL(cfg80211_inform_bss_data);
3063 static bool cfg80211_uhb_power_type_valid(const u8 *ie,
3067 const struct element *tmp;
3068 struct ieee80211_he_operation *he_oper;
3070 tmp = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie, ielen);
3071 if (tmp && tmp->datalen >= sizeof(*he_oper) + 1) {
3072 const struct ieee80211_he_6ghz_oper *he_6ghz_oper;
3074 he_oper = (void *)&tmp->data[1];
3075 he_6ghz_oper = ieee80211_he_6ghz_oper(he_oper);
3080 switch (u8_get_bits(he_6ghz_oper->control,
3081 IEEE80211_HE_6GHZ_OPER_CTRL_REG_INFO)) {
3082 case IEEE80211_6GHZ_CTRL_REG_LPI_AP:
3084 case IEEE80211_6GHZ_CTRL_REG_SP_AP:
3085 return !(flags & IEEE80211_CHAN_NO_UHB_AFC_CLIENT);
3086 case IEEE80211_6GHZ_CTRL_REG_VLP_AP:
3087 return !(flags & IEEE80211_CHAN_NO_UHB_VLP_CLIENT);
3093 /* cfg80211_inform_bss_width_frame helper */
3094 static struct cfg80211_bss *
3095 cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
3096 struct cfg80211_inform_bss *data,
3097 struct ieee80211_mgmt *mgmt, size_t len,
3100 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
3101 struct cfg80211_internal_bss tmp = {}, *res;
3102 struct cfg80211_bss_ies *ies;
3103 struct ieee80211_channel *channel;
3105 struct ieee80211_ext *ext = NULL;
3106 u8 *bssid, *variable;
3107 u16 capability, beacon_int;
3108 size_t ielen, min_hdr_len = offsetof(struct ieee80211_mgmt,
3109 u.probe_resp.variable);
3112 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
3113 offsetof(struct ieee80211_mgmt, u.beacon.variable));
3115 trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len);
3120 if (WARN_ON(!wiphy))
3123 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
3124 (data->signal < 0 || data->signal > 100)))
3127 if (ieee80211_is_s1g_beacon(mgmt->frame_control)) {
3128 ext = (void *) mgmt;
3129 min_hdr_len = offsetof(struct ieee80211_ext, u.s1g_beacon);
3130 if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
3131 min_hdr_len = offsetof(struct ieee80211_ext,
3132 u.s1g_short_beacon.variable);
3135 if (WARN_ON(len < min_hdr_len))
3138 ielen = len - min_hdr_len;
3139 variable = mgmt->u.probe_resp.variable;
3141 if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
3142 variable = ext->u.s1g_short_beacon.variable;
3144 variable = ext->u.s1g_beacon.variable;
3147 channel = cfg80211_get_bss_channel(wiphy, variable, ielen, data->chan);
3151 if (channel->band == NL80211_BAND_6GHZ &&
3152 !cfg80211_uhb_power_type_valid(variable, ielen, channel->flags)) {
3153 data->restrict_use = 1;
3155 data->cannot_use_reasons =
3156 NL80211_BSS_CANNOT_USE_UHB_PWR_MISMATCH;
3160 const struct ieee80211_s1g_bcn_compat_ie *compat;
3161 const struct element *elem;
3163 elem = cfg80211_find_elem(WLAN_EID_S1G_BCN_COMPAT,
3167 if (elem->datalen < sizeof(*compat))
3169 compat = (void *)elem->data;
3170 bssid = ext->u.s1g_beacon.sa;
3171 capability = le16_to_cpu(compat->compat_info);
3172 beacon_int = le16_to_cpu(compat->beacon_int);
3174 bssid = mgmt->bssid;
3175 beacon_int = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
3176 capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
3179 if (channel->band == NL80211_BAND_60GHZ) {
3180 bss_type = capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
3181 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
3182 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
3183 regulatory_hint_found_beacon(wiphy, channel, gfp);
3185 if (capability & WLAN_CAPABILITY_ESS)
3186 regulatory_hint_found_beacon(wiphy, channel, gfp);
3189 ies = kzalloc(sizeof(*ies) + ielen, gfp);
3193 ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
3194 ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control) ||
3195 ieee80211_is_s1g_beacon(mgmt->frame_control);
3196 memcpy(ies->data, variable, ielen);
3198 if (ieee80211_is_probe_resp(mgmt->frame_control))
3199 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
3201 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
3202 rcu_assign_pointer(tmp.pub.ies, ies);
3204 memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
3205 tmp.pub.beacon_interval = beacon_int;
3206 tmp.pub.capability = capability;
3207 tmp.pub.channel = channel;
3208 tmp.pub.signal = data->signal;
3209 tmp.ts_boottime = data->boottime_ns;
3210 tmp.parent_tsf = data->parent_tsf;
3211 tmp.pub.chains = data->chains;
3212 memcpy(tmp.pub.chain_signal, data->chain_signal, IEEE80211_MAX_CHAINS);
3213 ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
3214 tmp.pub.use_for = data->restrict_use ?
3216 NL80211_BSS_USE_FOR_ALL;
3217 tmp.pub.cannot_use_reasons = data->cannot_use_reasons;
3219 signal_valid = data->chan == channel;
3220 spin_lock_bh(&rdev->bss_lock);
3221 res = __cfg80211_bss_update(rdev, &tmp, signal_valid, jiffies);
3225 rdev_inform_bss(rdev, &res->pub, ies, data->drv_data);
3227 spin_unlock_bh(&rdev->bss_lock);
3229 trace_cfg80211_return_bss(&res->pub);
3230 /* __cfg80211_bss_update gives us a referenced result */
3234 spin_unlock_bh(&rdev->bss_lock);
3238 struct cfg80211_bss *
3239 cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
3240 struct cfg80211_inform_bss *data,
3241 struct ieee80211_mgmt *mgmt, size_t len,
3244 struct cfg80211_inform_single_bss_data inform_data = {
3246 .ie = mgmt->u.probe_resp.variable,
3247 .ielen = len - offsetof(struct ieee80211_mgmt,
3248 u.probe_resp.variable),
3249 .use_for = data->restrict_use ?
3251 NL80211_BSS_USE_FOR_ALL,
3252 .cannot_use_reasons = data->cannot_use_reasons,
3254 struct cfg80211_bss *res;
3256 res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt,
3261 /* don't do any further MBSSID/ML handling for S1G */
3262 if (ieee80211_is_s1g_beacon(mgmt->frame_control))
3265 inform_data.ftype = ieee80211_is_beacon(mgmt->frame_control) ?
3266 CFG80211_BSS_FTYPE_BEACON : CFG80211_BSS_FTYPE_PRESP;
3267 memcpy(inform_data.bssid, mgmt->bssid, ETH_ALEN);
3268 inform_data.tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
3269 inform_data.beacon_interval =
3270 le16_to_cpu(mgmt->u.probe_resp.beacon_int);
3272 /* process each non-transmitting bss */
3273 cfg80211_parse_mbssid_data(wiphy, &inform_data, res, gfp);
3275 cfg80211_parse_ml_sta_data(wiphy, &inform_data, res, gfp);
3279 EXPORT_SYMBOL(cfg80211_inform_bss_frame_data);
3281 void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
3283 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
3288 spin_lock_bh(&rdev->bss_lock);
3289 bss_ref_get(rdev, bss_from_pub(pub));
3290 spin_unlock_bh(&rdev->bss_lock);
3292 EXPORT_SYMBOL(cfg80211_ref_bss);
3294 void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
3296 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
3301 spin_lock_bh(&rdev->bss_lock);
3302 bss_ref_put(rdev, bss_from_pub(pub));
3303 spin_unlock_bh(&rdev->bss_lock);
3305 EXPORT_SYMBOL(cfg80211_put_bss);
3307 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
3309 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
3310 struct cfg80211_internal_bss *bss, *tmp1;
3311 struct cfg80211_bss *nontrans_bss, *tmp;
3316 bss = bss_from_pub(pub);
3318 spin_lock_bh(&rdev->bss_lock);
3319 if (list_empty(&bss->list))
3322 list_for_each_entry_safe(nontrans_bss, tmp,
3323 &pub->nontrans_list,
3325 tmp1 = bss_from_pub(nontrans_bss);
3326 if (__cfg80211_unlink_bss(rdev, tmp1))
3327 rdev->bss_generation++;
3330 if (__cfg80211_unlink_bss(rdev, bss))
3331 rdev->bss_generation++;
3333 spin_unlock_bh(&rdev->bss_lock);
3335 EXPORT_SYMBOL(cfg80211_unlink_bss);
3337 void cfg80211_bss_iter(struct wiphy *wiphy,
3338 struct cfg80211_chan_def *chandef,
3339 void (*iter)(struct wiphy *wiphy,
3340 struct cfg80211_bss *bss,
3344 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
3345 struct cfg80211_internal_bss *bss;
3347 spin_lock_bh(&rdev->bss_lock);
3349 list_for_each_entry(bss, &rdev->bss_list, list) {
3350 if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel,
3352 iter(wiphy, &bss->pub, iter_data);
3355 spin_unlock_bh(&rdev->bss_lock);
3357 EXPORT_SYMBOL(cfg80211_bss_iter);
3359 void cfg80211_update_assoc_bss_entry(struct wireless_dev *wdev,
3360 unsigned int link_id,
3361 struct ieee80211_channel *chan)
3363 struct wiphy *wiphy = wdev->wiphy;
3364 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
3365 struct cfg80211_internal_bss *cbss = wdev->links[link_id].client.current_bss;
3366 struct cfg80211_internal_bss *new = NULL;
3367 struct cfg80211_internal_bss *bss;
3368 struct cfg80211_bss *nontrans_bss;
3369 struct cfg80211_bss *tmp;
3371 spin_lock_bh(&rdev->bss_lock);
3374 * Some APs use CSA also for bandwidth changes, i.e., without actually
3375 * changing the control channel, so no need to update in such a case.
3377 if (cbss->pub.channel == chan)
3380 /* use transmitting bss */
3381 if (cbss->pub.transmitted_bss)
3382 cbss = bss_from_pub(cbss->pub.transmitted_bss);
3384 cbss->pub.channel = chan;
3386 list_for_each_entry(bss, &rdev->bss_list, list) {
3387 if (!cfg80211_bss_type_match(bss->pub.capability,
3388 bss->pub.channel->band,
3389 wdev->conn_bss_type))
3395 if (!cmp_bss(&bss->pub, &cbss->pub, BSS_CMP_REGULAR)) {
3402 /* to save time, update IEs for transmitting bss only */
3403 cfg80211_update_known_bss(rdev, cbss, new, false);
3404 new->pub.proberesp_ies = NULL;
3405 new->pub.beacon_ies = NULL;
3407 list_for_each_entry_safe(nontrans_bss, tmp,
3408 &new->pub.nontrans_list,
3410 bss = bss_from_pub(nontrans_bss);
3411 if (__cfg80211_unlink_bss(rdev, bss))
3412 rdev->bss_generation++;
3415 WARN_ON(atomic_read(&new->hold));
3416 if (!WARN_ON(!__cfg80211_unlink_bss(rdev, new)))
3417 rdev->bss_generation++;
3420 rb_erase(&cbss->rbn, &rdev->bss_tree);
3421 rb_insert_bss(rdev, cbss);
3422 rdev->bss_generation++;
3424 list_for_each_entry_safe(nontrans_bss, tmp,
3425 &cbss->pub.nontrans_list,
3427 bss = bss_from_pub(nontrans_bss);
3428 bss->pub.channel = chan;
3429 rb_erase(&bss->rbn, &rdev->bss_tree);
3430 rb_insert_bss(rdev, bss);
3431 rdev->bss_generation++;
3435 spin_unlock_bh(&rdev->bss_lock);
3438 #ifdef CONFIG_CFG80211_WEXT
3439 static struct cfg80211_registered_device *
3440 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
3442 struct cfg80211_registered_device *rdev;
3443 struct net_device *dev;
3447 dev = dev_get_by_index(net, ifindex);
3449 return ERR_PTR(-ENODEV);
3450 if (dev->ieee80211_ptr)
3451 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
3453 rdev = ERR_PTR(-ENODEV);
3458 int cfg80211_wext_siwscan(struct net_device *dev,
3459 struct iw_request_info *info,
3460 union iwreq_data *wrqu, char *extra)
3462 struct cfg80211_registered_device *rdev;
3463 struct wiphy *wiphy;
3464 struct iw_scan_req *wreq = NULL;
3465 struct cfg80211_scan_request *creq;
3466 int i, err, n_channels = 0;
3467 enum nl80211_band band;
3469 if (!netif_running(dev))
3472 if (wrqu->data.length == sizeof(struct iw_scan_req))
3473 wreq = (struct iw_scan_req *)extra;
3475 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
3478 return PTR_ERR(rdev);
3480 if (rdev->scan_req || rdev->scan_msg)
3483 wiphy = &rdev->wiphy;
3485 /* Determine number of channels, needed to allocate creq */
3486 if (wreq && wreq->num_channels)
3487 n_channels = wreq->num_channels;
3489 n_channels = ieee80211_get_num_supported_channels(wiphy);
3491 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
3492 n_channels * sizeof(void *),
3497 creq->wiphy = wiphy;
3498 creq->wdev = dev->ieee80211_ptr;
3499 /* SSIDs come after channels */
3500 creq->ssids = (void *)&creq->channels[n_channels];
3501 creq->n_channels = n_channels;
3503 creq->scan_start = jiffies;
3505 /* translate "Scan on frequencies" request */
3507 for (band = 0; band < NUM_NL80211_BANDS; band++) {
3510 if (!wiphy->bands[band])
3513 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
3514 /* ignore disabled channels */
3515 if (wiphy->bands[band]->channels[j].flags &
3516 IEEE80211_CHAN_DISABLED)
3519 /* If we have a wireless request structure and the
3520 * wireless request specifies frequencies, then search
3521 * for the matching hardware channel.
3523 if (wreq && wreq->num_channels) {
3525 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
3526 for (k = 0; k < wreq->num_channels; k++) {
3527 struct iw_freq *freq =
3528 &wreq->channel_list[k];
3530 cfg80211_wext_freq(freq);
3532 if (wext_freq == wiphy_freq)
3533 goto wext_freq_found;
3535 goto wext_freq_not_found;
3539 creq->channels[i] = &wiphy->bands[band]->channels[j];
3541 wext_freq_not_found: ;
3544 /* No channels found? */
3550 /* Set real number of channels specified in creq->channels[] */
3551 creq->n_channels = i;
3553 /* translate "Scan for SSID" request */
3555 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
3556 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
3560 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
3561 creq->ssids[0].ssid_len = wreq->essid_len;
3563 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
3567 for (i = 0; i < NUM_NL80211_BANDS; i++)
3568 if (wiphy->bands[i])
3569 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
3571 eth_broadcast_addr(creq->bssid);
3573 wiphy_lock(&rdev->wiphy);
3575 rdev->scan_req = creq;
3576 err = rdev_scan(rdev, creq);
3578 rdev->scan_req = NULL;
3579 /* creq will be freed below */
3581 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
3582 /* creq now owned by driver */
3586 wiphy_unlock(&rdev->wiphy);
3591 EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
3593 static char *ieee80211_scan_add_ies(struct iw_request_info *info,
3594 const struct cfg80211_bss_ies *ies,
3595 char *current_ev, char *end_buf)
3597 const u8 *pos, *end, *next;
3598 struct iw_event iwe;
3604 * If needed, fragment the IEs buffer (at IE boundaries) into short
3605 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
3608 end = pos + ies->len;
3610 while (end - pos > IW_GENERIC_IE_MAX) {
3611 next = pos + 2 + pos[1];
3612 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
3613 next = next + 2 + next[1];
3615 memset(&iwe, 0, sizeof(iwe));
3616 iwe.cmd = IWEVGENIE;
3617 iwe.u.data.length = next - pos;
3618 current_ev = iwe_stream_add_point_check(info, current_ev,
3621 if (IS_ERR(current_ev))
3627 memset(&iwe, 0, sizeof(iwe));
3628 iwe.cmd = IWEVGENIE;
3629 iwe.u.data.length = end - pos;
3630 current_ev = iwe_stream_add_point_check(info, current_ev,
3633 if (IS_ERR(current_ev))
3641 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
3642 struct cfg80211_internal_bss *bss, char *current_ev,
3645 const struct cfg80211_bss_ies *ies;
3646 struct iw_event iwe;
3651 bool ismesh = false;
3653 memset(&iwe, 0, sizeof(iwe));
3654 iwe.cmd = SIOCGIWAP;
3655 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
3656 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
3657 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
3659 if (IS_ERR(current_ev))
3662 memset(&iwe, 0, sizeof(iwe));
3663 iwe.cmd = SIOCGIWFREQ;
3664 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
3666 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
3668 if (IS_ERR(current_ev))
3671 memset(&iwe, 0, sizeof(iwe));
3672 iwe.cmd = SIOCGIWFREQ;
3673 iwe.u.freq.m = bss->pub.channel->center_freq;
3675 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
3677 if (IS_ERR(current_ev))
3680 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
3681 memset(&iwe, 0, sizeof(iwe));
3683 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
3684 IW_QUAL_NOISE_INVALID |
3685 IW_QUAL_QUAL_UPDATED;
3686 switch (wiphy->signal_type) {
3687 case CFG80211_SIGNAL_TYPE_MBM:
3688 sig = bss->pub.signal / 100;
3689 iwe.u.qual.level = sig;
3690 iwe.u.qual.updated |= IW_QUAL_DBM;
3691 if (sig < -110) /* rather bad */
3693 else if (sig > -40) /* perfect */
3695 /* will give a range of 0 .. 70 */
3696 iwe.u.qual.qual = sig + 110;
3698 case CFG80211_SIGNAL_TYPE_UNSPEC:
3699 iwe.u.qual.level = bss->pub.signal;
3700 /* will give range 0 .. 100 */
3701 iwe.u.qual.qual = bss->pub.signal;
3707 current_ev = iwe_stream_add_event_check(info, current_ev,
3710 if (IS_ERR(current_ev))
3714 memset(&iwe, 0, sizeof(iwe));
3715 iwe.cmd = SIOCGIWENCODE;
3716 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
3717 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
3719 iwe.u.data.flags = IW_ENCODE_DISABLED;
3720 iwe.u.data.length = 0;
3721 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
3723 if (IS_ERR(current_ev))
3727 ies = rcu_dereference(bss->pub.ies);
3733 if (ie[1] > rem - 2)
3738 memset(&iwe, 0, sizeof(iwe));
3739 iwe.cmd = SIOCGIWESSID;
3740 iwe.u.data.length = ie[1];
3741 iwe.u.data.flags = 1;
3742 current_ev = iwe_stream_add_point_check(info,
3746 if (IS_ERR(current_ev))
3749 case WLAN_EID_MESH_ID:
3750 memset(&iwe, 0, sizeof(iwe));
3751 iwe.cmd = SIOCGIWESSID;
3752 iwe.u.data.length = ie[1];
3753 iwe.u.data.flags = 1;
3754 current_ev = iwe_stream_add_point_check(info,
3758 if (IS_ERR(current_ev))
3761 case WLAN_EID_MESH_CONFIG:
3763 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
3766 memset(&iwe, 0, sizeof(iwe));
3767 iwe.cmd = IWEVCUSTOM;
3768 iwe.u.data.length = sprintf(buf,
3769 "Mesh Network Path Selection Protocol ID: 0x%02X",
3771 current_ev = iwe_stream_add_point_check(info,
3775 if (IS_ERR(current_ev))
3777 iwe.u.data.length = sprintf(buf,
3778 "Path Selection Metric ID: 0x%02X",
3780 current_ev = iwe_stream_add_point_check(info,
3784 if (IS_ERR(current_ev))
3786 iwe.u.data.length = sprintf(buf,
3787 "Congestion Control Mode ID: 0x%02X",
3789 current_ev = iwe_stream_add_point_check(info,
3793 if (IS_ERR(current_ev))
3795 iwe.u.data.length = sprintf(buf,
3796 "Synchronization ID: 0x%02X",
3798 current_ev = iwe_stream_add_point_check(info,
3802 if (IS_ERR(current_ev))
3804 iwe.u.data.length = sprintf(buf,
3805 "Authentication ID: 0x%02X",
3807 current_ev = iwe_stream_add_point_check(info,
3811 if (IS_ERR(current_ev))
3813 iwe.u.data.length = sprintf(buf,
3814 "Formation Info: 0x%02X",
3816 current_ev = iwe_stream_add_point_check(info,
3820 if (IS_ERR(current_ev))
3822 iwe.u.data.length = sprintf(buf,
3823 "Capabilities: 0x%02X",
3825 current_ev = iwe_stream_add_point_check(info,
3829 if (IS_ERR(current_ev))
3832 case WLAN_EID_SUPP_RATES:
3833 case WLAN_EID_EXT_SUPP_RATES:
3834 /* display all supported rates in readable format */
3835 p = current_ev + iwe_stream_lcp_len(info);
3837 memset(&iwe, 0, sizeof(iwe));
3838 iwe.cmd = SIOCGIWRATE;
3839 /* Those two flags are ignored... */
3840 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
3842 for (i = 0; i < ie[1]; i++) {
3843 iwe.u.bitrate.value =
3844 ((ie[i + 2] & 0x7f) * 500000);
3846 p = iwe_stream_add_value(info, current_ev, p,
3850 current_ev = ERR_PTR(-E2BIG);
3861 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
3863 memset(&iwe, 0, sizeof(iwe));
3864 iwe.cmd = SIOCGIWMODE;
3866 iwe.u.mode = IW_MODE_MESH;
3867 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
3868 iwe.u.mode = IW_MODE_MASTER;
3870 iwe.u.mode = IW_MODE_ADHOC;
3871 current_ev = iwe_stream_add_event_check(info, current_ev,
3874 if (IS_ERR(current_ev))
3878 memset(&iwe, 0, sizeof(iwe));
3879 iwe.cmd = IWEVCUSTOM;
3880 iwe.u.data.length = sprintf(buf, "tsf=%016llx",
3881 (unsigned long long)(ies->tsf));
3882 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
3884 if (IS_ERR(current_ev))
3886 memset(&iwe, 0, sizeof(iwe));
3887 iwe.cmd = IWEVCUSTOM;
3888 iwe.u.data.length = sprintf(buf, " Last beacon: %ums ago",
3889 elapsed_jiffies_msecs(bss->ts));
3890 current_ev = iwe_stream_add_point_check(info, current_ev,
3891 end_buf, &iwe, buf);
3892 if (IS_ERR(current_ev))
3895 current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
3903 static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
3904 struct iw_request_info *info,
3905 char *buf, size_t len)
3907 char *current_ev = buf;
3908 char *end_buf = buf + len;
3909 struct cfg80211_internal_bss *bss;
3912 spin_lock_bh(&rdev->bss_lock);
3913 cfg80211_bss_expire(rdev);
3915 list_for_each_entry(bss, &rdev->bss_list, list) {
3916 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
3920 current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
3921 current_ev, end_buf);
3922 if (IS_ERR(current_ev)) {
3923 err = PTR_ERR(current_ev);
3927 spin_unlock_bh(&rdev->bss_lock);
3931 return current_ev - buf;
3935 int cfg80211_wext_giwscan(struct net_device *dev,
3936 struct iw_request_info *info,
3937 union iwreq_data *wrqu, char *extra)
3939 struct iw_point *data = &wrqu->data;
3940 struct cfg80211_registered_device *rdev;
3943 if (!netif_running(dev))
3946 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
3949 return PTR_ERR(rdev);
3951 if (rdev->scan_req || rdev->scan_msg)
3954 res = ieee80211_scan_results(rdev, info, extra, data->length);
3963 EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan);