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) 2018-2021 Intel Corporation
10 #include <linux/kernel.h>
11 #include <linux/slab.h>
12 #include <linux/module.h>
13 #include <linux/netdevice.h>
14 #include <linux/wireless.h>
15 #include <linux/nl80211.h>
16 #include <linux/etherdevice.h>
17 #include <linux/crc32.h>
18 #include <linux/bitfield.h>
20 #include <net/cfg80211.h>
21 #include <net/cfg80211-wext.h>
22 #include <net/iw_handler.h>
25 #include "wext-compat.h"
29 * DOC: BSS tree/list structure
31 * At the top level, the BSS list is kept in both a list in each
32 * registered device (@bss_list) as well as an RB-tree for faster
33 * lookup. In the RB-tree, entries can be looked up using their
34 * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID
37 * Due to the possibility of hidden SSIDs, there's a second level
38 * structure, the "hidden_list" and "hidden_beacon_bss" pointer.
39 * The hidden_list connects all BSSes belonging to a single AP
40 * that has a hidden SSID, and connects beacon and probe response
41 * entries. For a probe response entry for a hidden SSID, the
42 * hidden_beacon_bss pointer points to the BSS struct holding the
43 * beacon's information.
45 * Reference counting is done for all these references except for
46 * the hidden_list, so that a beacon BSS struct that is otherwise
47 * not referenced has one reference for being on the bss_list and
48 * one for each probe response entry that points to it using the
49 * hidden_beacon_bss pointer. When a BSS struct that has such a
50 * pointer is get/put, the refcount update is also propagated to
51 * the referenced struct, this ensure that it cannot get removed
52 * while somebody is using the probe response version.
54 * Note that the hidden_beacon_bss pointer never changes, due to
55 * the reference counting. Therefore, no locking is needed for
58 * Also note that the hidden_beacon_bss pointer is only relevant
59 * if the driver uses something other than the IEs, e.g. private
60 * data stored in the BSS struct, since the beacon IEs are
61 * also linked into the probe response struct.
65 * Limit the number of BSS entries stored in mac80211. Each one is
66 * a bit over 4k at most, so this limits to roughly 4-5M of memory.
67 * If somebody wants to really attack this though, they'd likely
68 * use small beacons, and only one type of frame, limiting each of
69 * the entries to a much smaller size (in order to generate more
70 * entries in total, so overhead is bigger.)
72 static int bss_entries_limit = 1000;
73 module_param(bss_entries_limit, int, 0644);
74 MODULE_PARM_DESC(bss_entries_limit,
75 "limit to number of scan BSS entries (per wiphy, default 1000)");
77 #define IEEE80211_SCAN_RESULT_EXPIRE (30 * HZ)
80 * struct cfg80211_colocated_ap - colocated AP information
82 * @list: linked list to all colocated aPS
83 * @bssid: BSSID of the reported AP
84 * @ssid: SSID of the reported AP
85 * @ssid_len: length of the ssid
86 * @center_freq: frequency the reported AP is on
87 * @unsolicited_probe: the reported AP is part of an ESS, where all the APs
88 * that operate in the same channel as the reported AP and that might be
89 * detected by a STA receiving this frame, are transmitting unsolicited
90 * Probe Response frames every 20 TUs
91 * @oct_recommended: OCT is recommended to exchange MMPDUs with the reported AP
92 * @same_ssid: the reported AP has the same SSID as the reporting AP
93 * @multi_bss: the reported AP is part of a multiple BSSID set
94 * @transmitted_bssid: the reported AP is the transmitting BSSID
95 * @colocated_ess: all the APs that share the same ESS as the reported AP are
96 * colocated and can be discovered via legacy bands.
97 * @short_ssid_valid: short_ssid is valid and can be used
98 * @short_ssid: the short SSID for this SSID
100 struct cfg80211_colocated_ap {
101 struct list_head list;
103 u8 ssid[IEEE80211_MAX_SSID_LEN];
107 u8 unsolicited_probe:1,
116 static void bss_free(struct cfg80211_internal_bss *bss)
118 struct cfg80211_bss_ies *ies;
120 if (WARN_ON(atomic_read(&bss->hold)))
123 ies = (void *)rcu_access_pointer(bss->pub.beacon_ies);
124 if (ies && !bss->pub.hidden_beacon_bss)
125 kfree_rcu(ies, rcu_head);
126 ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies);
128 kfree_rcu(ies, rcu_head);
131 * This happens when the module is removed, it doesn't
132 * really matter any more save for completeness
134 if (!list_empty(&bss->hidden_list))
135 list_del(&bss->hidden_list);
140 static inline void bss_ref_get(struct cfg80211_registered_device *rdev,
141 struct cfg80211_internal_bss *bss)
143 lockdep_assert_held(&rdev->bss_lock);
146 if (bss->pub.hidden_beacon_bss) {
147 bss = container_of(bss->pub.hidden_beacon_bss,
148 struct cfg80211_internal_bss,
152 if (bss->pub.transmitted_bss) {
153 bss = container_of(bss->pub.transmitted_bss,
154 struct cfg80211_internal_bss,
160 static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
161 struct cfg80211_internal_bss *bss)
163 lockdep_assert_held(&rdev->bss_lock);
165 if (bss->pub.hidden_beacon_bss) {
166 struct cfg80211_internal_bss *hbss;
167 hbss = container_of(bss->pub.hidden_beacon_bss,
168 struct cfg80211_internal_bss,
171 if (hbss->refcount == 0)
175 if (bss->pub.transmitted_bss) {
176 struct cfg80211_internal_bss *tbss;
178 tbss = container_of(bss->pub.transmitted_bss,
179 struct cfg80211_internal_bss,
182 if (tbss->refcount == 0)
187 if (bss->refcount == 0)
191 static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev,
192 struct cfg80211_internal_bss *bss)
194 lockdep_assert_held(&rdev->bss_lock);
196 if (!list_empty(&bss->hidden_list)) {
198 * don't remove the beacon entry if it has
199 * probe responses associated with it
201 if (!bss->pub.hidden_beacon_bss)
204 * if it's a probe response entry break its
205 * link to the other entries in the group
207 list_del_init(&bss->hidden_list);
210 list_del_init(&bss->list);
211 list_del_init(&bss->pub.nontrans_list);
212 rb_erase(&bss->rbn, &rdev->bss_tree);
214 WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list),
215 "rdev bss entries[%d]/list[empty:%d] corruption\n",
216 rdev->bss_entries, list_empty(&rdev->bss_list));
217 bss_ref_put(rdev, bss);
221 bool cfg80211_is_element_inherited(const struct element *elem,
222 const struct element *non_inherit_elem)
224 u8 id_len, ext_id_len, i, loop_len, id;
227 if (elem->id == WLAN_EID_MULTIPLE_BSSID)
230 if (!non_inherit_elem || non_inherit_elem->datalen < 2)
234 * non inheritance element format is:
235 * ext ID (56) | IDs list len | list | extension IDs list len | list
236 * Both lists are optional. Both lengths are mandatory.
237 * This means valid length is:
238 * elem_len = 1 (extension ID) + 2 (list len fields) + list lengths
240 id_len = non_inherit_elem->data[1];
241 if (non_inherit_elem->datalen < 3 + id_len)
244 ext_id_len = non_inherit_elem->data[2 + id_len];
245 if (non_inherit_elem->datalen < 3 + id_len + ext_id_len)
248 if (elem->id == WLAN_EID_EXTENSION) {
251 loop_len = ext_id_len;
252 list = &non_inherit_elem->data[3 + id_len];
258 list = &non_inherit_elem->data[2];
262 for (i = 0; i < loop_len; i++) {
269 EXPORT_SYMBOL(cfg80211_is_element_inherited);
271 static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen,
272 const u8 *subelement, size_t subie_len,
273 u8 *new_ie, gfp_t gfp)
276 const u8 *tmp_old, *tmp_new;
277 const struct element *non_inherit_elem;
280 /* copy subelement as we need to change its content to
281 * mark an ie after it is processed.
283 sub_copy = kmemdup(subelement, subie_len, gfp);
290 tmp_new = cfg80211_find_ie(WLAN_EID_SSID, sub_copy, subie_len);
292 memcpy(pos, tmp_new, tmp_new[1] + 2);
293 pos += (tmp_new[1] + 2);
296 /* get non inheritance list if exists */
298 cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE,
299 sub_copy, subie_len);
301 /* go through IEs in ie (skip SSID) and subelement,
302 * merge them into new_ie
304 tmp_old = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
305 tmp_old = (tmp_old) ? tmp_old + tmp_old[1] + 2 : ie;
307 while (tmp_old + tmp_old[1] + 2 - ie <= ielen) {
308 if (tmp_old[0] == 0) {
313 if (tmp_old[0] == WLAN_EID_EXTENSION)
314 tmp = (u8 *)cfg80211_find_ext_ie(tmp_old[2], sub_copy,
317 tmp = (u8 *)cfg80211_find_ie(tmp_old[0], sub_copy,
321 const struct element *old_elem = (void *)tmp_old;
323 /* ie in old ie but not in subelement */
324 if (cfg80211_is_element_inherited(old_elem,
326 memcpy(pos, tmp_old, tmp_old[1] + 2);
327 pos += tmp_old[1] + 2;
330 /* ie in transmitting ie also in subelement,
331 * copy from subelement and flag the ie in subelement
332 * as copied (by setting eid field to WLAN_EID_SSID,
333 * which is skipped anyway).
334 * For vendor ie, compare OUI + type + subType to
335 * determine if they are the same ie.
337 if (tmp_old[0] == WLAN_EID_VENDOR_SPECIFIC) {
338 if (!memcmp(tmp_old + 2, tmp + 2, 5)) {
339 /* same vendor ie, copy from
342 memcpy(pos, tmp, tmp[1] + 2);
344 tmp[0] = WLAN_EID_SSID;
346 memcpy(pos, tmp_old, tmp_old[1] + 2);
347 pos += tmp_old[1] + 2;
350 /* copy ie from subelement into new ie */
351 memcpy(pos, tmp, tmp[1] + 2);
353 tmp[0] = WLAN_EID_SSID;
357 if (tmp_old + tmp_old[1] + 2 - ie == ielen)
360 tmp_old += tmp_old[1] + 2;
363 /* go through subelement again to check if there is any ie not
364 * copied to new ie, skip ssid, capability, bssid-index ie
367 while (tmp_new + tmp_new[1] + 2 - sub_copy <= subie_len) {
368 if (!(tmp_new[0] == WLAN_EID_NON_TX_BSSID_CAP ||
369 tmp_new[0] == WLAN_EID_SSID)) {
370 memcpy(pos, tmp_new, tmp_new[1] + 2);
371 pos += tmp_new[1] + 2;
373 if (tmp_new + tmp_new[1] + 2 - sub_copy == subie_len)
375 tmp_new += tmp_new[1] + 2;
382 static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
383 const u8 *ssid, size_t ssid_len)
385 const struct cfg80211_bss_ies *ies;
388 if (bssid && !ether_addr_equal(a->bssid, bssid))
394 ies = rcu_access_pointer(a->ies);
397 ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
400 if (ssidie[1] != ssid_len)
402 return memcmp(ssidie + 2, ssid, ssid_len) == 0;
406 cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss,
407 struct cfg80211_bss *nontrans_bss)
411 struct cfg80211_bss *bss = NULL;
414 ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
423 /* check if nontrans_bss is in the list */
424 list_for_each_entry(bss, &trans_bss->nontrans_list, nontrans_list) {
425 if (is_bss(bss, nontrans_bss->bssid, ssid, ssid_len))
429 /* add to the list */
430 list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list);
434 static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev,
435 unsigned long expire_time)
437 struct cfg80211_internal_bss *bss, *tmp;
438 bool expired = false;
440 lockdep_assert_held(&rdev->bss_lock);
442 list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) {
443 if (atomic_read(&bss->hold))
445 if (!time_after(expire_time, bss->ts))
448 if (__cfg80211_unlink_bss(rdev, bss))
453 rdev->bss_generation++;
456 static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev)
458 struct cfg80211_internal_bss *bss, *oldest = NULL;
461 lockdep_assert_held(&rdev->bss_lock);
463 list_for_each_entry(bss, &rdev->bss_list, list) {
464 if (atomic_read(&bss->hold))
467 if (!list_empty(&bss->hidden_list) &&
468 !bss->pub.hidden_beacon_bss)
471 if (oldest && time_before(oldest->ts, bss->ts))
476 if (WARN_ON(!oldest))
480 * The callers make sure to increase rdev->bss_generation if anything
481 * gets removed (and a new entry added), so there's no need to also do
485 ret = __cfg80211_unlink_bss(rdev, oldest);
490 static u8 cfg80211_parse_bss_param(u8 data,
491 struct cfg80211_colocated_ap *coloc_ap)
493 coloc_ap->oct_recommended =
494 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_OCT_RECOMMENDED);
495 coloc_ap->same_ssid =
496 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_SAME_SSID);
497 coloc_ap->multi_bss =
498 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID);
499 coloc_ap->transmitted_bssid =
500 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_TRANSMITTED_BSSID);
501 coloc_ap->unsolicited_probe =
502 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_PROBE_ACTIVE);
503 coloc_ap->colocated_ess =
504 u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_ESS);
506 return u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_AP);
509 static int cfg80211_calc_short_ssid(const struct cfg80211_bss_ies *ies,
510 const struct element **elem, u32 *s_ssid)
513 *elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len);
514 if (!*elem || (*elem)->datalen > IEEE80211_MAX_SSID_LEN)
517 *s_ssid = ~crc32_le(~0, (*elem)->data, (*elem)->datalen);
521 static void cfg80211_free_coloc_ap_list(struct list_head *coloc_ap_list)
523 struct cfg80211_colocated_ap *ap, *tmp_ap;
525 list_for_each_entry_safe(ap, tmp_ap, coloc_ap_list, list) {
531 static int cfg80211_parse_ap_info(struct cfg80211_colocated_ap *entry,
532 const u8 *pos, u8 length,
533 const struct element *ssid_elem,
536 /* skip the TBTT offset */
539 memcpy(entry->bssid, pos, ETH_ALEN);
542 if (length == IEEE80211_TBTT_INFO_OFFSET_BSSID_SSSID_BSS_PARAM) {
543 memcpy(&entry->short_ssid, pos,
544 sizeof(entry->short_ssid));
545 entry->short_ssid_valid = true;
549 /* skip non colocated APs */
550 if (!cfg80211_parse_bss_param(*pos, entry))
554 if (length == IEEE80211_TBTT_INFO_OFFSET_BSSID_BSS_PARAM) {
556 * no information about the short ssid. Consider the entry valid
557 * for now. It would later be dropped in case there are explicit
558 * SSIDs that need to be matched
560 if (!entry->same_ssid)
564 if (entry->same_ssid) {
565 entry->short_ssid = s_ssid_tmp;
566 entry->short_ssid_valid = true;
569 * This is safe because we validate datalen in
570 * cfg80211_parse_colocated_ap(), before calling this
573 memcpy(&entry->ssid, &ssid_elem->data,
575 entry->ssid_len = ssid_elem->datalen;
580 static int cfg80211_parse_colocated_ap(const struct cfg80211_bss_ies *ies,
581 struct list_head *list)
583 struct ieee80211_neighbor_ap_info *ap_info;
584 const struct element *elem, *ssid_elem;
587 int n_coloc = 0, ret;
590 elem = cfg80211_find_elem(WLAN_EID_REDUCED_NEIGHBOR_REPORT, ies->data,
596 end = pos + elem->datalen;
598 ret = cfg80211_calc_short_ssid(ies, &ssid_elem, &s_ssid_tmp);
602 /* RNR IE may contain more than one NEIGHBOR_AP_INFO */
603 while (pos + sizeof(*ap_info) <= end) {
604 enum nl80211_band band;
608 ap_info = (void *)pos;
609 count = u8_get_bits(ap_info->tbtt_info_hdr,
610 IEEE80211_AP_INFO_TBTT_HDR_COUNT) + 1;
611 length = ap_info->tbtt_info_len;
613 pos += sizeof(*ap_info);
615 if (!ieee80211_operating_class_to_band(ap_info->op_class,
619 freq = ieee80211_channel_to_frequency(ap_info->channel, band);
621 if (end - pos < count * length)
625 * TBTT info must include bss param + BSSID +
626 * (short SSID or same_ssid bit to be set).
627 * ignore other options, and move to the
630 if (band != NL80211_BAND_6GHZ ||
631 (length != IEEE80211_TBTT_INFO_OFFSET_BSSID_BSS_PARAM &&
632 length < IEEE80211_TBTT_INFO_OFFSET_BSSID_SSSID_BSS_PARAM)) {
633 pos += count * length;
637 for (i = 0; i < count; i++) {
638 struct cfg80211_colocated_ap *entry;
640 entry = kzalloc(sizeof(*entry) + IEEE80211_MAX_SSID_LEN,
646 entry->center_freq = freq;
648 if (!cfg80211_parse_ap_info(entry, pos, length,
649 ssid_elem, s_ssid_tmp)) {
651 list_add_tail(&entry->list, &ap_list);
661 cfg80211_free_coloc_ap_list(&ap_list);
665 list_splice_tail(&ap_list, list);
669 static void cfg80211_scan_req_add_chan(struct cfg80211_scan_request *request,
670 struct ieee80211_channel *chan,
674 u32 n_channels = request->n_channels;
675 struct cfg80211_scan_6ghz_params *params =
676 &request->scan_6ghz_params[request->n_6ghz_params];
678 for (i = 0; i < n_channels; i++) {
679 if (request->channels[i] == chan) {
681 params->channel_idx = i;
686 request->channels[n_channels] = chan;
688 request->scan_6ghz_params[request->n_6ghz_params].channel_idx =
691 request->n_channels++;
694 static bool cfg80211_find_ssid_match(struct cfg80211_colocated_ap *ap,
695 struct cfg80211_scan_request *request)
700 for (i = 0; i < request->n_ssids; i++) {
701 /* wildcard ssid in the scan request */
702 if (!request->ssids[i].ssid_len)
706 ap->ssid_len == request->ssids[i].ssid_len) {
707 if (!memcmp(request->ssids[i].ssid, ap->ssid,
710 } else if (ap->short_ssid_valid) {
711 s_ssid = ~crc32_le(~0, request->ssids[i].ssid,
712 request->ssids[i].ssid_len);
714 if (ap->short_ssid == s_ssid)
722 static int cfg80211_scan_6ghz(struct cfg80211_registered_device *rdev)
725 struct cfg80211_colocated_ap *ap;
726 int n_channels, count = 0, err;
727 struct cfg80211_scan_request *request, *rdev_req = rdev->scan_req;
728 LIST_HEAD(coloc_ap_list);
729 bool need_scan_psc = true;
730 const struct ieee80211_sband_iftype_data *iftd;
732 rdev_req->scan_6ghz = true;
734 if (!rdev->wiphy.bands[NL80211_BAND_6GHZ])
737 iftd = ieee80211_get_sband_iftype_data(rdev->wiphy.bands[NL80211_BAND_6GHZ],
738 rdev_req->wdev->iftype);
739 if (!iftd || !iftd->he_cap.has_he)
742 n_channels = rdev->wiphy.bands[NL80211_BAND_6GHZ]->n_channels;
744 if (rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ) {
745 struct cfg80211_internal_bss *intbss;
747 spin_lock_bh(&rdev->bss_lock);
748 list_for_each_entry(intbss, &rdev->bss_list, list) {
749 struct cfg80211_bss *res = &intbss->pub;
750 const struct cfg80211_bss_ies *ies;
752 ies = rcu_access_pointer(res->ies);
753 count += cfg80211_parse_colocated_ap(ies,
756 spin_unlock_bh(&rdev->bss_lock);
759 request = kzalloc(struct_size(request, channels, n_channels) +
760 sizeof(*request->scan_6ghz_params) * count +
761 sizeof(*request->ssids) * rdev_req->n_ssids,
764 cfg80211_free_coloc_ap_list(&coloc_ap_list);
768 *request = *rdev_req;
769 request->n_channels = 0;
770 request->scan_6ghz_params =
771 (void *)&request->channels[n_channels];
774 * PSC channels should not be scanned in case of direct scan with 1 SSID
775 * and at least one of the reported co-located APs with same SSID
776 * indicating that all APs in the same ESS are co-located
778 if (count && request->n_ssids == 1 && request->ssids[0].ssid_len) {
779 list_for_each_entry(ap, &coloc_ap_list, list) {
780 if (ap->colocated_ess &&
781 cfg80211_find_ssid_match(ap, request)) {
782 need_scan_psc = false;
789 * add to the scan request the channels that need to be scanned
790 * regardless of the collocated APs (PSC channels or all channels
791 * in case that NL80211_SCAN_FLAG_COLOCATED_6GHZ is not set)
793 for (i = 0; i < rdev_req->n_channels; i++) {
794 if (rdev_req->channels[i]->band == NL80211_BAND_6GHZ &&
796 cfg80211_channel_is_psc(rdev_req->channels[i])) ||
797 !(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))) {
798 cfg80211_scan_req_add_chan(request,
799 rdev_req->channels[i],
804 if (!(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))
807 list_for_each_entry(ap, &coloc_ap_list, list) {
809 struct cfg80211_scan_6ghz_params *scan_6ghz_params =
810 &request->scan_6ghz_params[request->n_6ghz_params];
811 struct ieee80211_channel *chan =
812 ieee80211_get_channel(&rdev->wiphy, ap->center_freq);
814 if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
817 for (i = 0; i < rdev_req->n_channels; i++) {
818 if (rdev_req->channels[i] == chan)
825 if (request->n_ssids > 0 &&
826 !cfg80211_find_ssid_match(ap, request))
829 cfg80211_scan_req_add_chan(request, chan, true);
830 memcpy(scan_6ghz_params->bssid, ap->bssid, ETH_ALEN);
831 scan_6ghz_params->short_ssid = ap->short_ssid;
832 scan_6ghz_params->short_ssid_valid = ap->short_ssid_valid;
833 scan_6ghz_params->unsolicited_probe = ap->unsolicited_probe;
836 * If a PSC channel is added to the scan and 'need_scan_psc' is
837 * set to false, then all the APs that the scan logic is
838 * interested with on the channel are collocated and thus there
839 * is no need to perform the initial PSC channel listen.
841 if (cfg80211_channel_is_psc(chan) && !need_scan_psc)
842 scan_6ghz_params->psc_no_listen = true;
844 request->n_6ghz_params++;
848 cfg80211_free_coloc_ap_list(&coloc_ap_list);
850 if (request->n_channels) {
851 struct cfg80211_scan_request *old = rdev->int_scan_req;
852 rdev->int_scan_req = request;
855 * Add the ssids from the parent scan request to the new scan
856 * request, so the driver would be able to use them in its
857 * probe requests to discover hidden APs on PSC channels.
859 request->ssids = (void *)&request->channels[request->n_channels];
860 request->n_ssids = rdev_req->n_ssids;
861 memcpy(request->ssids, rdev_req->ssids, sizeof(*request->ssids) *
865 * If this scan follows a previous scan, save the scan start
866 * info from the first part of the scan
869 rdev->int_scan_req->info = old->info;
871 err = rdev_scan(rdev, request);
873 rdev->int_scan_req = old;
886 int cfg80211_scan(struct cfg80211_registered_device *rdev)
888 struct cfg80211_scan_request *request;
889 struct cfg80211_scan_request *rdev_req = rdev->scan_req;
890 u32 n_channels = 0, idx, i;
892 if (!(rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ))
893 return rdev_scan(rdev, rdev_req);
895 for (i = 0; i < rdev_req->n_channels; i++) {
896 if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ)
901 return cfg80211_scan_6ghz(rdev);
903 request = kzalloc(struct_size(request, channels, n_channels),
908 *request = *rdev_req;
909 request->n_channels = n_channels;
911 for (i = idx = 0; i < rdev_req->n_channels; i++) {
912 if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ)
913 request->channels[idx++] = rdev_req->channels[i];
916 rdev_req->scan_6ghz = false;
917 rdev->int_scan_req = request;
918 return rdev_scan(rdev, request);
921 void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
924 struct cfg80211_scan_request *request, *rdev_req;
925 struct wireless_dev *wdev;
927 #ifdef CONFIG_CFG80211_WEXT
928 union iwreq_data wrqu;
931 lockdep_assert_held(&rdev->wiphy.mtx);
933 if (rdev->scan_msg) {
934 nl80211_send_scan_msg(rdev, rdev->scan_msg);
935 rdev->scan_msg = NULL;
939 rdev_req = rdev->scan_req;
943 wdev = rdev_req->wdev;
944 request = rdev->int_scan_req ? rdev->int_scan_req : rdev_req;
946 if (wdev_running(wdev) &&
947 (rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ) &&
948 !rdev_req->scan_6ghz && !request->info.aborted &&
949 !cfg80211_scan_6ghz(rdev))
953 * This must be before sending the other events!
954 * Otherwise, wpa_supplicant gets completely confused with
958 cfg80211_sme_scan_done(wdev->netdev);
960 if (!request->info.aborted &&
961 request->flags & NL80211_SCAN_FLAG_FLUSH) {
962 /* flush entries from previous scans */
963 spin_lock_bh(&rdev->bss_lock);
964 __cfg80211_bss_expire(rdev, request->scan_start);
965 spin_unlock_bh(&rdev->bss_lock);
968 msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted);
970 #ifdef CONFIG_CFG80211_WEXT
971 if (wdev->netdev && !request->info.aborted) {
972 memset(&wrqu, 0, sizeof(wrqu));
974 wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
978 dev_put(wdev->netdev);
980 kfree(rdev->int_scan_req);
981 rdev->int_scan_req = NULL;
983 kfree(rdev->scan_req);
984 rdev->scan_req = NULL;
987 rdev->scan_msg = msg;
989 nl80211_send_scan_msg(rdev, msg);
992 void __cfg80211_scan_done(struct work_struct *wk)
994 struct cfg80211_registered_device *rdev;
996 rdev = container_of(wk, struct cfg80211_registered_device,
999 wiphy_lock(&rdev->wiphy);
1000 ___cfg80211_scan_done(rdev, true);
1001 wiphy_unlock(&rdev->wiphy);
1004 void cfg80211_scan_done(struct cfg80211_scan_request *request,
1005 struct cfg80211_scan_info *info)
1007 struct cfg80211_scan_info old_info = request->info;
1009 trace_cfg80211_scan_done(request, info);
1010 WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req &&
1011 request != wiphy_to_rdev(request->wiphy)->int_scan_req);
1013 request->info = *info;
1016 * In case the scan is split, the scan_start_tsf and tsf_bssid should
1017 * be of the first part. In such a case old_info.scan_start_tsf should
1020 if (request->scan_6ghz && old_info.scan_start_tsf) {
1021 request->info.scan_start_tsf = old_info.scan_start_tsf;
1022 memcpy(request->info.tsf_bssid, old_info.tsf_bssid,
1023 sizeof(request->info.tsf_bssid));
1026 request->notified = true;
1027 queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk);
1029 EXPORT_SYMBOL(cfg80211_scan_done);
1031 void cfg80211_add_sched_scan_req(struct cfg80211_registered_device *rdev,
1032 struct cfg80211_sched_scan_request *req)
1034 lockdep_assert_held(&rdev->wiphy.mtx);
1036 list_add_rcu(&req->list, &rdev->sched_scan_req_list);
1039 static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device *rdev,
1040 struct cfg80211_sched_scan_request *req)
1042 lockdep_assert_held(&rdev->wiphy.mtx);
1044 list_del_rcu(&req->list);
1045 kfree_rcu(req, rcu_head);
1048 static struct cfg80211_sched_scan_request *
1049 cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid)
1051 struct cfg80211_sched_scan_request *pos;
1053 list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list,
1054 lockdep_is_held(&rdev->wiphy.mtx)) {
1055 if (pos->reqid == reqid)
1062 * Determines if a scheduled scan request can be handled. When a legacy
1063 * scheduled scan is running no other scheduled scan is allowed regardless
1064 * whether the request is for legacy or multi-support scan. When a multi-support
1065 * scheduled scan is running a request for legacy scan is not allowed. In this
1066 * case a request for multi-support scan can be handled if resources are
1067 * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached.
1069 int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev,
1072 struct cfg80211_sched_scan_request *pos;
1075 list_for_each_entry(pos, &rdev->sched_scan_req_list, list) {
1076 /* request id zero means legacy in progress */
1077 if (!i && !pos->reqid)
1078 return -EINPROGRESS;
1083 /* no legacy allowed when multi request(s) are active */
1085 return -EINPROGRESS;
1087 /* resource limit reached */
1088 if (i == rdev->wiphy.max_sched_scan_reqs)
1094 void cfg80211_sched_scan_results_wk(struct work_struct *work)
1096 struct cfg80211_registered_device *rdev;
1097 struct cfg80211_sched_scan_request *req, *tmp;
1099 rdev = container_of(work, struct cfg80211_registered_device,
1102 wiphy_lock(&rdev->wiphy);
1103 list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
1104 if (req->report_results) {
1105 req->report_results = false;
1106 if (req->flags & NL80211_SCAN_FLAG_FLUSH) {
1107 /* flush entries from previous scans */
1108 spin_lock_bh(&rdev->bss_lock);
1109 __cfg80211_bss_expire(rdev, req->scan_start);
1110 spin_unlock_bh(&rdev->bss_lock);
1111 req->scan_start = jiffies;
1113 nl80211_send_sched_scan(req,
1114 NL80211_CMD_SCHED_SCAN_RESULTS);
1117 wiphy_unlock(&rdev->wiphy);
1120 void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid)
1122 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1123 struct cfg80211_sched_scan_request *request;
1125 trace_cfg80211_sched_scan_results(wiphy, reqid);
1126 /* ignore if we're not scanning */
1129 request = cfg80211_find_sched_scan_req(rdev, reqid);
1131 request->report_results = true;
1132 queue_work(cfg80211_wq, &rdev->sched_scan_res_wk);
1136 EXPORT_SYMBOL(cfg80211_sched_scan_results);
1138 void cfg80211_sched_scan_stopped_locked(struct wiphy *wiphy, u64 reqid)
1140 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1142 lockdep_assert_held(&wiphy->mtx);
1144 trace_cfg80211_sched_scan_stopped(wiphy, reqid);
1146 __cfg80211_stop_sched_scan(rdev, reqid, true);
1148 EXPORT_SYMBOL(cfg80211_sched_scan_stopped_locked);
1150 void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid)
1153 cfg80211_sched_scan_stopped_locked(wiphy, reqid);
1154 wiphy_unlock(wiphy);
1156 EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
1158 int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev,
1159 struct cfg80211_sched_scan_request *req,
1160 bool driver_initiated)
1162 lockdep_assert_held(&rdev->wiphy.mtx);
1164 if (!driver_initiated) {
1165 int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid);
1170 nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED);
1172 cfg80211_del_sched_scan_req(rdev, req);
1177 int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
1178 u64 reqid, bool driver_initiated)
1180 struct cfg80211_sched_scan_request *sched_scan_req;
1182 lockdep_assert_held(&rdev->wiphy.mtx);
1184 sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid);
1185 if (!sched_scan_req)
1188 return cfg80211_stop_sched_scan_req(rdev, sched_scan_req,
1192 void cfg80211_bss_age(struct cfg80211_registered_device *rdev,
1193 unsigned long age_secs)
1195 struct cfg80211_internal_bss *bss;
1196 unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
1198 spin_lock_bh(&rdev->bss_lock);
1199 list_for_each_entry(bss, &rdev->bss_list, list)
1200 bss->ts -= age_jiffies;
1201 spin_unlock_bh(&rdev->bss_lock);
1204 void cfg80211_bss_expire(struct cfg80211_registered_device *rdev)
1206 __cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
1209 void cfg80211_bss_flush(struct wiphy *wiphy)
1211 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1213 spin_lock_bh(&rdev->bss_lock);
1214 __cfg80211_bss_expire(rdev, jiffies);
1215 spin_unlock_bh(&rdev->bss_lock);
1217 EXPORT_SYMBOL(cfg80211_bss_flush);
1219 const struct element *
1220 cfg80211_find_elem_match(u8 eid, const u8 *ies, unsigned int len,
1221 const u8 *match, unsigned int match_len,
1222 unsigned int match_offset)
1224 const struct element *elem;
1226 for_each_element_id(elem, eid, ies, len) {
1227 if (elem->datalen >= match_offset + match_len &&
1228 !memcmp(elem->data + match_offset, match, match_len))
1234 EXPORT_SYMBOL(cfg80211_find_elem_match);
1236 const struct element *cfg80211_find_vendor_elem(unsigned int oui, int oui_type,
1240 const struct element *elem;
1241 u8 match[] = { oui >> 16, oui >> 8, oui, oui_type };
1242 int match_len = (oui_type < 0) ? 3 : sizeof(match);
1244 if (WARN_ON(oui_type > 0xff))
1247 elem = cfg80211_find_elem_match(WLAN_EID_VENDOR_SPECIFIC, ies, len,
1248 match, match_len, 0);
1250 if (!elem || elem->datalen < 4)
1255 EXPORT_SYMBOL(cfg80211_find_vendor_elem);
1258 * enum bss_compare_mode - BSS compare mode
1259 * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
1260 * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
1261 * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
1263 enum bss_compare_mode {
1269 static int cmp_bss(struct cfg80211_bss *a,
1270 struct cfg80211_bss *b,
1271 enum bss_compare_mode mode)
1273 const struct cfg80211_bss_ies *a_ies, *b_ies;
1274 const u8 *ie1 = NULL;
1275 const u8 *ie2 = NULL;
1278 if (a->channel != b->channel)
1279 return b->channel->center_freq - a->channel->center_freq;
1281 a_ies = rcu_access_pointer(a->ies);
1284 b_ies = rcu_access_pointer(b->ies);
1288 if (WLAN_CAPABILITY_IS_STA_BSS(a->capability))
1289 ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID,
1290 a_ies->data, a_ies->len);
1291 if (WLAN_CAPABILITY_IS_STA_BSS(b->capability))
1292 ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID,
1293 b_ies->data, b_ies->len);
1297 if (ie1[1] == ie2[1])
1298 mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]);
1300 mesh_id_cmp = ie2[1] - ie1[1];
1302 ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
1303 a_ies->data, a_ies->len);
1304 ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
1305 b_ies->data, b_ies->len);
1309 if (ie1[1] != ie2[1])
1310 return ie2[1] - ie1[1];
1311 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
1315 r = memcmp(a->bssid, b->bssid, sizeof(a->bssid));
1319 ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
1320 ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
1326 * Note that with "hide_ssid", the function returns a match if
1327 * the already-present BSS ("b") is a hidden SSID beacon for
1328 * the new BSS ("a").
1331 /* sort missing IE before (left of) present IE */
1338 case BSS_CMP_HIDE_ZLEN:
1340 * In ZLEN mode we assume the BSS entry we're
1341 * looking for has a zero-length SSID. So if
1342 * the one we're looking at right now has that,
1343 * return 0. Otherwise, return the difference
1344 * in length, but since we're looking for the
1345 * 0-length it's really equivalent to returning
1346 * the length of the one we're looking at.
1348 * No content comparison is needed as we assume
1349 * the content length is zero.
1352 case BSS_CMP_REGULAR:
1354 /* sort by length first, then by contents */
1355 if (ie1[1] != ie2[1])
1356 return ie2[1] - ie1[1];
1357 return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
1358 case BSS_CMP_HIDE_NUL:
1359 if (ie1[1] != ie2[1])
1360 return ie2[1] - ie1[1];
1361 /* this is equivalent to memcmp(zeroes, ie2 + 2, len) */
1362 for (i = 0; i < ie2[1]; i++)
1369 static bool cfg80211_bss_type_match(u16 capability,
1370 enum nl80211_band band,
1371 enum ieee80211_bss_type bss_type)
1376 if (bss_type == IEEE80211_BSS_TYPE_ANY)
1379 if (band == NL80211_BAND_60GHZ) {
1380 mask = WLAN_CAPABILITY_DMG_TYPE_MASK;
1382 case IEEE80211_BSS_TYPE_ESS:
1383 val = WLAN_CAPABILITY_DMG_TYPE_AP;
1385 case IEEE80211_BSS_TYPE_PBSS:
1386 val = WLAN_CAPABILITY_DMG_TYPE_PBSS;
1388 case IEEE80211_BSS_TYPE_IBSS:
1389 val = WLAN_CAPABILITY_DMG_TYPE_IBSS;
1395 mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS;
1397 case IEEE80211_BSS_TYPE_ESS:
1398 val = WLAN_CAPABILITY_ESS;
1400 case IEEE80211_BSS_TYPE_IBSS:
1401 val = WLAN_CAPABILITY_IBSS;
1403 case IEEE80211_BSS_TYPE_MBSS:
1411 ret = ((capability & mask) == val);
1415 /* Returned bss is reference counted and must be cleaned up appropriately. */
1416 struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
1417 struct ieee80211_channel *channel,
1419 const u8 *ssid, size_t ssid_len,
1420 enum ieee80211_bss_type bss_type,
1421 enum ieee80211_privacy privacy)
1423 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1424 struct cfg80211_internal_bss *bss, *res = NULL;
1425 unsigned long now = jiffies;
1428 trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type,
1431 spin_lock_bh(&rdev->bss_lock);
1433 list_for_each_entry(bss, &rdev->bss_list, list) {
1434 if (!cfg80211_bss_type_match(bss->pub.capability,
1435 bss->pub.channel->band, bss_type))
1438 bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY);
1439 if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) ||
1440 (privacy == IEEE80211_PRIVACY_OFF && bss_privacy))
1442 if (channel && bss->pub.channel != channel)
1444 if (!is_valid_ether_addr(bss->pub.bssid))
1446 /* Don't get expired BSS structs */
1447 if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
1448 !atomic_read(&bss->hold))
1450 if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
1452 bss_ref_get(rdev, res);
1457 spin_unlock_bh(&rdev->bss_lock);
1460 trace_cfg80211_return_bss(&res->pub);
1463 EXPORT_SYMBOL(cfg80211_get_bss);
1465 static void rb_insert_bss(struct cfg80211_registered_device *rdev,
1466 struct cfg80211_internal_bss *bss)
1468 struct rb_node **p = &rdev->bss_tree.rb_node;
1469 struct rb_node *parent = NULL;
1470 struct cfg80211_internal_bss *tbss;
1475 tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
1477 cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR);
1479 if (WARN_ON(!cmp)) {
1480 /* will sort of leak this BSS */
1487 p = &(*p)->rb_right;
1490 rb_link_node(&bss->rbn, parent, p);
1491 rb_insert_color(&bss->rbn, &rdev->bss_tree);
1494 static struct cfg80211_internal_bss *
1495 rb_find_bss(struct cfg80211_registered_device *rdev,
1496 struct cfg80211_internal_bss *res,
1497 enum bss_compare_mode mode)
1499 struct rb_node *n = rdev->bss_tree.rb_node;
1500 struct cfg80211_internal_bss *bss;
1504 bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
1505 r = cmp_bss(&res->pub, &bss->pub, mode);
1518 static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev,
1519 struct cfg80211_internal_bss *new)
1521 const struct cfg80211_bss_ies *ies;
1522 struct cfg80211_internal_bss *bss;
1528 ies = rcu_access_pointer(new->pub.beacon_ies);
1532 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
1539 for (i = 0; i < ssidlen; i++)
1543 /* not a hidden SSID */
1547 /* This is the bad part ... */
1549 list_for_each_entry(bss, &rdev->bss_list, list) {
1551 * we're iterating all the entries anyway, so take the
1552 * opportunity to validate the list length accounting
1556 if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid))
1558 if (bss->pub.channel != new->pub.channel)
1560 if (bss->pub.scan_width != new->pub.scan_width)
1562 if (rcu_access_pointer(bss->pub.beacon_ies))
1564 ies = rcu_access_pointer(bss->pub.ies);
1567 ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
1570 if (ssidlen && ie[1] != ssidlen)
1572 if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss))
1574 if (WARN_ON_ONCE(!list_empty(&bss->hidden_list)))
1575 list_del(&bss->hidden_list);
1577 list_add(&bss->hidden_list, &new->hidden_list);
1578 bss->pub.hidden_beacon_bss = &new->pub;
1579 new->refcount += bss->refcount;
1580 rcu_assign_pointer(bss->pub.beacon_ies,
1581 new->pub.beacon_ies);
1584 WARN_ONCE(n_entries != rdev->bss_entries,
1585 "rdev bss entries[%d]/list[len:%d] corruption\n",
1586 rdev->bss_entries, n_entries);
1591 struct cfg80211_non_tx_bss {
1592 struct cfg80211_bss *tx_bss;
1593 u8 max_bssid_indicator;
1598 cfg80211_update_known_bss(struct cfg80211_registered_device *rdev,
1599 struct cfg80211_internal_bss *known,
1600 struct cfg80211_internal_bss *new,
1603 lockdep_assert_held(&rdev->bss_lock);
1606 if (rcu_access_pointer(new->pub.proberesp_ies)) {
1607 const struct cfg80211_bss_ies *old;
1609 old = rcu_access_pointer(known->pub.proberesp_ies);
1611 rcu_assign_pointer(known->pub.proberesp_ies,
1612 new->pub.proberesp_ies);
1613 /* Override possible earlier Beacon frame IEs */
1614 rcu_assign_pointer(known->pub.ies,
1615 new->pub.proberesp_ies);
1617 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1618 } else if (rcu_access_pointer(new->pub.beacon_ies)) {
1619 const struct cfg80211_bss_ies *old;
1620 struct cfg80211_internal_bss *bss;
1622 if (known->pub.hidden_beacon_bss &&
1623 !list_empty(&known->hidden_list)) {
1624 const struct cfg80211_bss_ies *f;
1626 /* The known BSS struct is one of the probe
1627 * response members of a group, but we're
1628 * receiving a beacon (beacon_ies in the new
1629 * bss is used). This can only mean that the
1630 * AP changed its beacon from not having an
1631 * SSID to showing it, which is confusing so
1632 * drop this information.
1635 f = rcu_access_pointer(new->pub.beacon_ies);
1636 kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head);
1640 old = rcu_access_pointer(known->pub.beacon_ies);
1642 rcu_assign_pointer(known->pub.beacon_ies, new->pub.beacon_ies);
1644 /* Override IEs if they were from a beacon before */
1645 if (old == rcu_access_pointer(known->pub.ies))
1646 rcu_assign_pointer(known->pub.ies, new->pub.beacon_ies);
1648 /* Assign beacon IEs to all sub entries */
1649 list_for_each_entry(bss, &known->hidden_list, hidden_list) {
1650 const struct cfg80211_bss_ies *ies;
1652 ies = rcu_access_pointer(bss->pub.beacon_ies);
1653 WARN_ON(ies != old);
1655 rcu_assign_pointer(bss->pub.beacon_ies,
1656 new->pub.beacon_ies);
1660 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
1663 known->pub.beacon_interval = new->pub.beacon_interval;
1665 /* don't update the signal if beacon was heard on
1669 known->pub.signal = new->pub.signal;
1670 known->pub.capability = new->pub.capability;
1671 known->ts = new->ts;
1672 known->ts_boottime = new->ts_boottime;
1673 known->parent_tsf = new->parent_tsf;
1674 known->pub.chains = new->pub.chains;
1675 memcpy(known->pub.chain_signal, new->pub.chain_signal,
1676 IEEE80211_MAX_CHAINS);
1677 ether_addr_copy(known->parent_bssid, new->parent_bssid);
1678 known->pub.max_bssid_indicator = new->pub.max_bssid_indicator;
1679 known->pub.bssid_index = new->pub.bssid_index;
1684 /* Returned bss is reference counted and must be cleaned up appropriately. */
1685 struct cfg80211_internal_bss *
1686 cfg80211_bss_update(struct cfg80211_registered_device *rdev,
1687 struct cfg80211_internal_bss *tmp,
1688 bool signal_valid, unsigned long ts)
1690 struct cfg80211_internal_bss *found = NULL;
1692 if (WARN_ON(!tmp->pub.channel))
1697 spin_lock_bh(&rdev->bss_lock);
1699 if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
1700 spin_unlock_bh(&rdev->bss_lock);
1704 found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR);
1707 if (!cfg80211_update_known_bss(rdev, found, tmp, signal_valid))
1710 struct cfg80211_internal_bss *new;
1711 struct cfg80211_internal_bss *hidden;
1712 struct cfg80211_bss_ies *ies;
1715 * create a copy -- the "res" variable that is passed in
1716 * is allocated on the stack since it's not needed in the
1717 * more common case of an update
1719 new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size,
1722 ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
1724 kfree_rcu(ies, rcu_head);
1725 ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
1727 kfree_rcu(ies, rcu_head);
1730 memcpy(new, tmp, sizeof(*new));
1732 INIT_LIST_HEAD(&new->hidden_list);
1733 INIT_LIST_HEAD(&new->pub.nontrans_list);
1735 if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
1736 hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
1738 hidden = rb_find_bss(rdev, tmp,
1741 new->pub.hidden_beacon_bss = &hidden->pub;
1742 list_add(&new->hidden_list,
1743 &hidden->hidden_list);
1745 rcu_assign_pointer(new->pub.beacon_ies,
1746 hidden->pub.beacon_ies);
1750 * Ok so we found a beacon, and don't have an entry. If
1751 * it's a beacon with hidden SSID, we might be in for an
1752 * expensive search for any probe responses that should
1753 * be grouped with this beacon for updates ...
1755 if (!cfg80211_combine_bsses(rdev, new)) {
1756 bss_ref_put(rdev, new);
1761 if (rdev->bss_entries >= bss_entries_limit &&
1762 !cfg80211_bss_expire_oldest(rdev)) {
1763 bss_ref_put(rdev, new);
1767 /* This must be before the call to bss_ref_get */
1768 if (tmp->pub.transmitted_bss) {
1769 struct cfg80211_internal_bss *pbss =
1770 container_of(tmp->pub.transmitted_bss,
1771 struct cfg80211_internal_bss,
1774 new->pub.transmitted_bss = tmp->pub.transmitted_bss;
1775 bss_ref_get(rdev, pbss);
1778 list_add_tail(&new->list, &rdev->bss_list);
1779 rdev->bss_entries++;
1780 rb_insert_bss(rdev, new);
1784 rdev->bss_generation++;
1785 bss_ref_get(rdev, found);
1786 spin_unlock_bh(&rdev->bss_lock);
1790 spin_unlock_bh(&rdev->bss_lock);
1795 * Update RX channel information based on the available frame payload
1796 * information. This is mainly for the 2.4 GHz band where frames can be received
1797 * from neighboring channels and the Beacon frames use the DSSS Parameter Set
1798 * element to indicate the current (transmitting) channel, but this might also
1799 * be needed on other bands if RX frequency does not match with the actual
1800 * operating channel of a BSS.
1802 static struct ieee80211_channel *
1803 cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
1804 struct ieee80211_channel *channel,
1805 enum nl80211_bss_scan_width scan_width)
1809 int channel_number = -1;
1810 struct ieee80211_channel *alt_channel;
1812 if (channel->band == NL80211_BAND_S1GHZ) {
1813 tmp = cfg80211_find_ie(WLAN_EID_S1G_OPERATION, ie, ielen);
1814 if (tmp && tmp[1] >= sizeof(struct ieee80211_s1g_oper_ie)) {
1815 struct ieee80211_s1g_oper_ie *s1gop = (void *)(tmp + 2);
1817 channel_number = s1gop->primary_ch;
1820 tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen);
1821 if (tmp && tmp[1] == 1) {
1822 channel_number = tmp[2];
1824 tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen);
1825 if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) {
1826 struct ieee80211_ht_operation *htop = (void *)(tmp + 2);
1828 channel_number = htop->primary_chan;
1833 if (channel_number < 0) {
1834 /* No channel information in frame payload */
1838 freq = ieee80211_channel_to_freq_khz(channel_number, channel->band);
1839 alt_channel = ieee80211_get_channel_khz(wiphy, freq);
1841 if (channel->band == NL80211_BAND_2GHZ) {
1843 * Better not allow unexpected channels when that could
1844 * be going beyond the 1-11 range (e.g., discovering
1845 * BSS on channel 12 when radio is configured for
1851 /* No match for the payload channel number - ignore it */
1855 if (scan_width == NL80211_BSS_CHAN_WIDTH_10 ||
1856 scan_width == NL80211_BSS_CHAN_WIDTH_5) {
1858 * Ignore channel number in 5 and 10 MHz channels where there
1859 * may not be an n:1 or 1:n mapping between frequencies and
1866 * Use the channel determined through the payload channel number
1867 * instead of the RX channel reported by the driver.
1869 if (alt_channel->flags & IEEE80211_CHAN_DISABLED)
1874 /* Returned bss is reference counted and must be cleaned up appropriately. */
1875 static struct cfg80211_bss *
1876 cfg80211_inform_single_bss_data(struct wiphy *wiphy,
1877 struct cfg80211_inform_bss *data,
1878 enum cfg80211_bss_frame_type ftype,
1879 const u8 *bssid, u64 tsf, u16 capability,
1880 u16 beacon_interval, const u8 *ie, size_t ielen,
1881 struct cfg80211_non_tx_bss *non_tx_data,
1884 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
1885 struct cfg80211_bss_ies *ies;
1886 struct ieee80211_channel *channel;
1887 struct cfg80211_internal_bss tmp = {}, *res;
1892 if (WARN_ON(!wiphy))
1895 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
1896 (data->signal < 0 || data->signal > 100)))
1899 channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan,
1904 memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
1905 tmp.pub.channel = channel;
1906 tmp.pub.scan_width = data->scan_width;
1907 tmp.pub.signal = data->signal;
1908 tmp.pub.beacon_interval = beacon_interval;
1909 tmp.pub.capability = capability;
1910 tmp.ts_boottime = data->boottime_ns;
1911 tmp.parent_tsf = data->parent_tsf;
1912 ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
1915 tmp.pub.transmitted_bss = non_tx_data->tx_bss;
1916 ts = bss_from_pub(non_tx_data->tx_bss)->ts;
1917 tmp.pub.bssid_index = non_tx_data->bssid_index;
1918 tmp.pub.max_bssid_indicator = non_tx_data->max_bssid_indicator;
1924 * If we do not know here whether the IEs are from a Beacon or Probe
1925 * Response frame, we need to pick one of the options and only use it
1926 * with the driver that does not provide the full Beacon/Probe Response
1927 * frame. Use Beacon frame pointer to avoid indicating that this should
1928 * override the IEs pointer should we have received an earlier
1929 * indication of Probe Response data.
1931 ies = kzalloc(sizeof(*ies) + ielen, gfp);
1936 ies->from_beacon = false;
1937 memcpy(ies->data, ie, ielen);
1940 case CFG80211_BSS_FTYPE_BEACON:
1941 ies->from_beacon = true;
1943 case CFG80211_BSS_FTYPE_UNKNOWN:
1944 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
1946 case CFG80211_BSS_FTYPE_PRESP:
1947 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
1950 rcu_assign_pointer(tmp.pub.ies, ies);
1952 signal_valid = data->chan == channel;
1953 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid, ts);
1957 if (channel->band == NL80211_BAND_60GHZ) {
1958 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
1959 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
1960 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
1961 regulatory_hint_found_beacon(wiphy, channel, gfp);
1963 if (res->pub.capability & WLAN_CAPABILITY_ESS)
1964 regulatory_hint_found_beacon(wiphy, channel, gfp);
1968 /* this is a nontransmitting bss, we need to add it to
1969 * transmitting bss' list if it is not there
1971 if (cfg80211_add_nontrans_list(non_tx_data->tx_bss,
1973 if (__cfg80211_unlink_bss(rdev, res))
1974 rdev->bss_generation++;
1978 trace_cfg80211_return_bss(&res->pub);
1979 /* cfg80211_bss_update gives us a referenced result */
1983 static const struct element
1984 *cfg80211_get_profile_continuation(const u8 *ie, size_t ielen,
1985 const struct element *mbssid_elem,
1986 const struct element *sub_elem)
1988 const u8 *mbssid_end = mbssid_elem->data + mbssid_elem->datalen;
1989 const struct element *next_mbssid;
1990 const struct element *next_sub;
1992 next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID,
1994 ielen - (mbssid_end - ie));
1997 * If it is not the last subelement in current MBSSID IE or there isn't
1998 * a next MBSSID IE - profile is complete.
2000 if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) ||
2004 /* For any length error, just return NULL */
2006 if (next_mbssid->datalen < 4)
2009 next_sub = (void *)&next_mbssid->data[1];
2011 if (next_mbssid->data + next_mbssid->datalen <
2012 next_sub->data + next_sub->datalen)
2015 if (next_sub->id != 0 || next_sub->datalen < 2)
2019 * Check if the first element in the next sub element is a start
2022 return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ?
2026 size_t cfg80211_merge_profile(const u8 *ie, size_t ielen,
2027 const struct element *mbssid_elem,
2028 const struct element *sub_elem,
2029 u8 *merged_ie, size_t max_copy_len)
2031 size_t copied_len = sub_elem->datalen;
2032 const struct element *next_mbssid;
2034 if (sub_elem->datalen > max_copy_len)
2037 memcpy(merged_ie, sub_elem->data, sub_elem->datalen);
2039 while ((next_mbssid = cfg80211_get_profile_continuation(ie, ielen,
2042 const struct element *next_sub = (void *)&next_mbssid->data[1];
2044 if (copied_len + next_sub->datalen > max_copy_len)
2046 memcpy(merged_ie + copied_len, next_sub->data,
2048 copied_len += next_sub->datalen;
2053 EXPORT_SYMBOL(cfg80211_merge_profile);
2055 static void cfg80211_parse_mbssid_data(struct wiphy *wiphy,
2056 struct cfg80211_inform_bss *data,
2057 enum cfg80211_bss_frame_type ftype,
2058 const u8 *bssid, u64 tsf,
2059 u16 beacon_interval, const u8 *ie,
2061 struct cfg80211_non_tx_bss *non_tx_data,
2064 const u8 *mbssid_index_ie;
2065 const struct element *elem, *sub;
2067 u8 new_bssid[ETH_ALEN];
2068 u8 *new_ie, *profile;
2069 u64 seen_indices = 0;
2071 struct cfg80211_bss *bss;
2075 if (!cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
2077 if (!wiphy->support_mbssid)
2079 if (wiphy->support_only_he_mbssid &&
2080 !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
2083 new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp);
2087 profile = kmalloc(ielen, gfp);
2091 for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, ie, ielen) {
2092 if (elem->datalen < 4)
2094 for_each_element(sub, elem->data + 1, elem->datalen - 1) {
2097 if (sub->id != 0 || sub->datalen < 4) {
2098 /* not a valid BSS profile */
2102 if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP ||
2103 sub->data[1] != 2) {
2104 /* The first element within the Nontransmitted
2105 * BSSID Profile is not the Nontransmitted
2106 * BSSID Capability element.
2111 memset(profile, 0, ielen);
2112 profile_len = cfg80211_merge_profile(ie, ielen,
2118 /* found a Nontransmitted BSSID Profile */
2119 mbssid_index_ie = cfg80211_find_ie
2120 (WLAN_EID_MULTI_BSSID_IDX,
2121 profile, profile_len);
2122 if (!mbssid_index_ie || mbssid_index_ie[1] < 1 ||
2123 mbssid_index_ie[2] == 0 ||
2124 mbssid_index_ie[2] > 46) {
2125 /* No valid Multiple BSSID-Index element */
2129 if (seen_indices & BIT_ULL(mbssid_index_ie[2]))
2130 /* We don't support legacy split of a profile */
2131 net_dbg_ratelimited("Partial info for BSSID index %d\n",
2132 mbssid_index_ie[2]);
2134 seen_indices |= BIT_ULL(mbssid_index_ie[2]);
2136 non_tx_data->bssid_index = mbssid_index_ie[2];
2137 non_tx_data->max_bssid_indicator = elem->data[0];
2139 cfg80211_gen_new_bssid(bssid,
2140 non_tx_data->max_bssid_indicator,
2141 non_tx_data->bssid_index,
2143 memset(new_ie, 0, IEEE80211_MAX_DATA_LEN);
2144 new_ie_len = cfg80211_gen_new_ie(ie, ielen,
2146 profile_len, new_ie,
2151 capability = get_unaligned_le16(profile + 2);
2152 bss = cfg80211_inform_single_bss_data(wiphy, data,
2163 cfg80211_put_bss(wiphy, bss);
2172 struct cfg80211_bss *
2173 cfg80211_inform_bss_data(struct wiphy *wiphy,
2174 struct cfg80211_inform_bss *data,
2175 enum cfg80211_bss_frame_type ftype,
2176 const u8 *bssid, u64 tsf, u16 capability,
2177 u16 beacon_interval, const u8 *ie, size_t ielen,
2180 struct cfg80211_bss *res;
2181 struct cfg80211_non_tx_bss non_tx_data;
2183 res = cfg80211_inform_single_bss_data(wiphy, data, ftype, bssid, tsf,
2184 capability, beacon_interval, ie,
2188 non_tx_data.tx_bss = res;
2189 cfg80211_parse_mbssid_data(wiphy, data, ftype, bssid, tsf,
2190 beacon_interval, ie, ielen, &non_tx_data,
2194 EXPORT_SYMBOL(cfg80211_inform_bss_data);
2197 cfg80211_parse_mbssid_frame_data(struct wiphy *wiphy,
2198 struct cfg80211_inform_bss *data,
2199 struct ieee80211_mgmt *mgmt, size_t len,
2200 struct cfg80211_non_tx_bss *non_tx_data,
2203 enum cfg80211_bss_frame_type ftype;
2204 const u8 *ie = mgmt->u.probe_resp.variable;
2205 size_t ielen = len - offsetof(struct ieee80211_mgmt,
2206 u.probe_resp.variable);
2208 ftype = ieee80211_is_beacon(mgmt->frame_control) ?
2209 CFG80211_BSS_FTYPE_BEACON : CFG80211_BSS_FTYPE_PRESP;
2211 cfg80211_parse_mbssid_data(wiphy, data, ftype, mgmt->bssid,
2212 le64_to_cpu(mgmt->u.probe_resp.timestamp),
2213 le16_to_cpu(mgmt->u.probe_resp.beacon_int),
2214 ie, ielen, non_tx_data, gfp);
2218 cfg80211_update_notlisted_nontrans(struct wiphy *wiphy,
2219 struct cfg80211_bss *nontrans_bss,
2220 struct ieee80211_mgmt *mgmt, size_t len)
2222 u8 *ie, *new_ie, *pos;
2223 const u8 *nontrans_ssid, *trans_ssid, *mbssid;
2224 size_t ielen = len - offsetof(struct ieee80211_mgmt,
2225 u.probe_resp.variable);
2227 struct cfg80211_bss_ies *new_ies;
2228 const struct cfg80211_bss_ies *old;
2231 lockdep_assert_held(&wiphy_to_rdev(wiphy)->bss_lock);
2233 ie = mgmt->u.probe_resp.variable;
2236 trans_ssid = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
2239 new_ie_len -= trans_ssid[1];
2240 mbssid = cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen);
2242 * It's not valid to have the MBSSID element before SSID
2243 * ignore if that happens - the code below assumes it is
2244 * after (while copying things inbetween).
2246 if (!mbssid || mbssid < trans_ssid)
2248 new_ie_len -= mbssid[1];
2250 nontrans_ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
2254 new_ie_len += nontrans_ssid[1];
2256 /* generate new ie for nontrans BSS
2257 * 1. replace SSID with nontrans BSS' SSID
2260 new_ie = kzalloc(new_ie_len, GFP_ATOMIC);
2264 new_ies = kzalloc(sizeof(*new_ies) + new_ie_len, GFP_ATOMIC);
2270 /* copy the nontransmitted SSID */
2271 cpy_len = nontrans_ssid[1] + 2;
2272 memcpy(pos, nontrans_ssid, cpy_len);
2274 /* copy the IEs between SSID and MBSSID */
2275 cpy_len = trans_ssid[1] + 2;
2276 memcpy(pos, (trans_ssid + cpy_len), (mbssid - (trans_ssid + cpy_len)));
2277 pos += (mbssid - (trans_ssid + cpy_len));
2278 /* copy the IEs after MBSSID */
2279 cpy_len = mbssid[1] + 2;
2280 memcpy(pos, mbssid + cpy_len, ((ie + ielen) - (mbssid + cpy_len)));
2283 new_ies->len = new_ie_len;
2284 new_ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
2285 new_ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
2286 memcpy(new_ies->data, new_ie, new_ie_len);
2287 if (ieee80211_is_probe_resp(mgmt->frame_control)) {
2288 old = rcu_access_pointer(nontrans_bss->proberesp_ies);
2289 rcu_assign_pointer(nontrans_bss->proberesp_ies, new_ies);
2290 rcu_assign_pointer(nontrans_bss->ies, new_ies);
2292 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
2294 old = rcu_access_pointer(nontrans_bss->beacon_ies);
2295 rcu_assign_pointer(nontrans_bss->beacon_ies, new_ies);
2296 rcu_assign_pointer(nontrans_bss->ies, new_ies);
2298 kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
2305 /* cfg80211_inform_bss_width_frame helper */
2306 static struct cfg80211_bss *
2307 cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
2308 struct cfg80211_inform_bss *data,
2309 struct ieee80211_mgmt *mgmt, size_t len,
2312 struct cfg80211_internal_bss tmp = {}, *res;
2313 struct cfg80211_bss_ies *ies;
2314 struct ieee80211_channel *channel;
2316 struct ieee80211_ext *ext = NULL;
2317 u8 *bssid, *variable;
2318 u16 capability, beacon_int;
2319 size_t ielen, min_hdr_len = offsetof(struct ieee80211_mgmt,
2320 u.probe_resp.variable);
2323 BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
2324 offsetof(struct ieee80211_mgmt, u.beacon.variable));
2326 trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len);
2331 if (WARN_ON(!wiphy))
2334 if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
2335 (data->signal < 0 || data->signal > 100)))
2338 if (ieee80211_is_s1g_beacon(mgmt->frame_control)) {
2339 ext = (void *) mgmt;
2340 min_hdr_len = offsetof(struct ieee80211_ext, u.s1g_beacon);
2341 if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
2342 min_hdr_len = offsetof(struct ieee80211_ext,
2343 u.s1g_short_beacon.variable);
2346 if (WARN_ON(len < min_hdr_len))
2349 ielen = len - min_hdr_len;
2350 variable = mgmt->u.probe_resp.variable;
2352 if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
2353 variable = ext->u.s1g_short_beacon.variable;
2355 variable = ext->u.s1g_beacon.variable;
2358 channel = cfg80211_get_bss_channel(wiphy, variable,
2359 ielen, data->chan, data->scan_width);
2364 const struct ieee80211_s1g_bcn_compat_ie *compat;
2365 const struct element *elem;
2367 elem = cfg80211_find_elem(WLAN_EID_S1G_BCN_COMPAT,
2371 if (elem->datalen < sizeof(*compat))
2373 compat = (void *)elem->data;
2374 bssid = ext->u.s1g_beacon.sa;
2375 capability = le16_to_cpu(compat->compat_info);
2376 beacon_int = le16_to_cpu(compat->beacon_int);
2378 bssid = mgmt->bssid;
2379 beacon_int = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
2380 capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
2383 ies = kzalloc(sizeof(*ies) + ielen, gfp);
2387 ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
2388 ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control) ||
2389 ieee80211_is_s1g_beacon(mgmt->frame_control);
2390 memcpy(ies->data, variable, ielen);
2392 if (ieee80211_is_probe_resp(mgmt->frame_control))
2393 rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
2395 rcu_assign_pointer(tmp.pub.beacon_ies, ies);
2396 rcu_assign_pointer(tmp.pub.ies, ies);
2398 memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
2399 tmp.pub.beacon_interval = beacon_int;
2400 tmp.pub.capability = capability;
2401 tmp.pub.channel = channel;
2402 tmp.pub.scan_width = data->scan_width;
2403 tmp.pub.signal = data->signal;
2404 tmp.ts_boottime = data->boottime_ns;
2405 tmp.parent_tsf = data->parent_tsf;
2406 tmp.pub.chains = data->chains;
2407 memcpy(tmp.pub.chain_signal, data->chain_signal, IEEE80211_MAX_CHAINS);
2408 ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
2410 signal_valid = data->chan == channel;
2411 res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid,
2416 if (channel->band == NL80211_BAND_60GHZ) {
2417 bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
2418 if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
2419 bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
2420 regulatory_hint_found_beacon(wiphy, channel, gfp);
2422 if (res->pub.capability & WLAN_CAPABILITY_ESS)
2423 regulatory_hint_found_beacon(wiphy, channel, gfp);
2426 trace_cfg80211_return_bss(&res->pub);
2427 /* cfg80211_bss_update gives us a referenced result */
2431 struct cfg80211_bss *
2432 cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
2433 struct cfg80211_inform_bss *data,
2434 struct ieee80211_mgmt *mgmt, size_t len,
2437 struct cfg80211_bss *res, *tmp_bss;
2438 const u8 *ie = mgmt->u.probe_resp.variable;
2439 const struct cfg80211_bss_ies *ies1, *ies2;
2440 size_t ielen = len - offsetof(struct ieee80211_mgmt,
2441 u.probe_resp.variable);
2442 struct cfg80211_non_tx_bss non_tx_data;
2444 res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt,
2446 if (!res || !wiphy->support_mbssid ||
2447 !cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
2449 if (wiphy->support_only_he_mbssid &&
2450 !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
2453 non_tx_data.tx_bss = res;
2454 /* process each non-transmitting bss */
2455 cfg80211_parse_mbssid_frame_data(wiphy, data, mgmt, len,
2458 spin_lock_bh(&wiphy_to_rdev(wiphy)->bss_lock);
2460 /* check if the res has other nontransmitting bss which is not
2463 ies1 = rcu_access_pointer(res->ies);
2465 /* go through nontrans_list, if the timestamp of the BSS is
2466 * earlier than the timestamp of the transmitting BSS then
2469 list_for_each_entry(tmp_bss, &res->nontrans_list,
2471 ies2 = rcu_access_pointer(tmp_bss->ies);
2472 if (ies2->tsf < ies1->tsf)
2473 cfg80211_update_notlisted_nontrans(wiphy, tmp_bss,
2476 spin_unlock_bh(&wiphy_to_rdev(wiphy)->bss_lock);
2480 EXPORT_SYMBOL(cfg80211_inform_bss_frame_data);
2482 void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
2484 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2485 struct cfg80211_internal_bss *bss;
2490 bss = container_of(pub, struct cfg80211_internal_bss, pub);
2492 spin_lock_bh(&rdev->bss_lock);
2493 bss_ref_get(rdev, bss);
2494 spin_unlock_bh(&rdev->bss_lock);
2496 EXPORT_SYMBOL(cfg80211_ref_bss);
2498 void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
2500 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2501 struct cfg80211_internal_bss *bss;
2506 bss = container_of(pub, struct cfg80211_internal_bss, pub);
2508 spin_lock_bh(&rdev->bss_lock);
2509 bss_ref_put(rdev, bss);
2510 spin_unlock_bh(&rdev->bss_lock);
2512 EXPORT_SYMBOL(cfg80211_put_bss);
2514 void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
2516 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2517 struct cfg80211_internal_bss *bss, *tmp1;
2518 struct cfg80211_bss *nontrans_bss, *tmp;
2523 bss = container_of(pub, struct cfg80211_internal_bss, pub);
2525 spin_lock_bh(&rdev->bss_lock);
2526 if (list_empty(&bss->list))
2529 list_for_each_entry_safe(nontrans_bss, tmp,
2530 &pub->nontrans_list,
2532 tmp1 = container_of(nontrans_bss,
2533 struct cfg80211_internal_bss, pub);
2534 if (__cfg80211_unlink_bss(rdev, tmp1))
2535 rdev->bss_generation++;
2538 if (__cfg80211_unlink_bss(rdev, bss))
2539 rdev->bss_generation++;
2541 spin_unlock_bh(&rdev->bss_lock);
2543 EXPORT_SYMBOL(cfg80211_unlink_bss);
2545 void cfg80211_bss_iter(struct wiphy *wiphy,
2546 struct cfg80211_chan_def *chandef,
2547 void (*iter)(struct wiphy *wiphy,
2548 struct cfg80211_bss *bss,
2552 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2553 struct cfg80211_internal_bss *bss;
2555 spin_lock_bh(&rdev->bss_lock);
2557 list_for_each_entry(bss, &rdev->bss_list, list) {
2558 if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel))
2559 iter(wiphy, &bss->pub, iter_data);
2562 spin_unlock_bh(&rdev->bss_lock);
2564 EXPORT_SYMBOL(cfg80211_bss_iter);
2566 void cfg80211_update_assoc_bss_entry(struct wireless_dev *wdev,
2567 struct ieee80211_channel *chan)
2569 struct wiphy *wiphy = wdev->wiphy;
2570 struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
2571 struct cfg80211_internal_bss *cbss = wdev->current_bss;
2572 struct cfg80211_internal_bss *new = NULL;
2573 struct cfg80211_internal_bss *bss;
2574 struct cfg80211_bss *nontrans_bss;
2575 struct cfg80211_bss *tmp;
2577 spin_lock_bh(&rdev->bss_lock);
2580 * Some APs use CSA also for bandwidth changes, i.e., without actually
2581 * changing the control channel, so no need to update in such a case.
2583 if (cbss->pub.channel == chan)
2586 /* use transmitting bss */
2587 if (cbss->pub.transmitted_bss)
2588 cbss = container_of(cbss->pub.transmitted_bss,
2589 struct cfg80211_internal_bss,
2592 cbss->pub.channel = chan;
2594 list_for_each_entry(bss, &rdev->bss_list, list) {
2595 if (!cfg80211_bss_type_match(bss->pub.capability,
2596 bss->pub.channel->band,
2597 wdev->conn_bss_type))
2603 if (!cmp_bss(&bss->pub, &cbss->pub, BSS_CMP_REGULAR)) {
2610 /* to save time, update IEs for transmitting bss only */
2611 if (cfg80211_update_known_bss(rdev, cbss, new, false)) {
2612 new->pub.proberesp_ies = NULL;
2613 new->pub.beacon_ies = NULL;
2616 list_for_each_entry_safe(nontrans_bss, tmp,
2617 &new->pub.nontrans_list,
2619 bss = container_of(nontrans_bss,
2620 struct cfg80211_internal_bss, pub);
2621 if (__cfg80211_unlink_bss(rdev, bss))
2622 rdev->bss_generation++;
2625 WARN_ON(atomic_read(&new->hold));
2626 if (!WARN_ON(!__cfg80211_unlink_bss(rdev, new)))
2627 rdev->bss_generation++;
2630 rb_erase(&cbss->rbn, &rdev->bss_tree);
2631 rb_insert_bss(rdev, cbss);
2632 rdev->bss_generation++;
2634 list_for_each_entry_safe(nontrans_bss, tmp,
2635 &cbss->pub.nontrans_list,
2637 bss = container_of(nontrans_bss,
2638 struct cfg80211_internal_bss, pub);
2639 bss->pub.channel = chan;
2640 rb_erase(&bss->rbn, &rdev->bss_tree);
2641 rb_insert_bss(rdev, bss);
2642 rdev->bss_generation++;
2646 spin_unlock_bh(&rdev->bss_lock);
2649 #ifdef CONFIG_CFG80211_WEXT
2650 static struct cfg80211_registered_device *
2651 cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
2653 struct cfg80211_registered_device *rdev;
2654 struct net_device *dev;
2658 dev = dev_get_by_index(net, ifindex);
2660 return ERR_PTR(-ENODEV);
2661 if (dev->ieee80211_ptr)
2662 rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
2664 rdev = ERR_PTR(-ENODEV);
2669 int cfg80211_wext_siwscan(struct net_device *dev,
2670 struct iw_request_info *info,
2671 union iwreq_data *wrqu, char *extra)
2673 struct cfg80211_registered_device *rdev;
2674 struct wiphy *wiphy;
2675 struct iw_scan_req *wreq = NULL;
2676 struct cfg80211_scan_request *creq = NULL;
2677 int i, err, n_channels = 0;
2678 enum nl80211_band band;
2680 if (!netif_running(dev))
2683 if (wrqu->data.length == sizeof(struct iw_scan_req))
2684 wreq = (struct iw_scan_req *)extra;
2686 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
2689 return PTR_ERR(rdev);
2691 if (rdev->scan_req || rdev->scan_msg) {
2696 wiphy = &rdev->wiphy;
2698 /* Determine number of channels, needed to allocate creq */
2699 if (wreq && wreq->num_channels)
2700 n_channels = wreq->num_channels;
2702 n_channels = ieee80211_get_num_supported_channels(wiphy);
2704 creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
2705 n_channels * sizeof(void *),
2712 creq->wiphy = wiphy;
2713 creq->wdev = dev->ieee80211_ptr;
2714 /* SSIDs come after channels */
2715 creq->ssids = (void *)&creq->channels[n_channels];
2716 creq->n_channels = n_channels;
2718 creq->scan_start = jiffies;
2720 /* translate "Scan on frequencies" request */
2722 for (band = 0; band < NUM_NL80211_BANDS; band++) {
2725 if (!wiphy->bands[band])
2728 for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
2729 /* ignore disabled channels */
2730 if (wiphy->bands[band]->channels[j].flags &
2731 IEEE80211_CHAN_DISABLED)
2734 /* If we have a wireless request structure and the
2735 * wireless request specifies frequencies, then search
2736 * for the matching hardware channel.
2738 if (wreq && wreq->num_channels) {
2740 int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
2741 for (k = 0; k < wreq->num_channels; k++) {
2742 struct iw_freq *freq =
2743 &wreq->channel_list[k];
2745 cfg80211_wext_freq(freq);
2747 if (wext_freq == wiphy_freq)
2748 goto wext_freq_found;
2750 goto wext_freq_not_found;
2754 creq->channels[i] = &wiphy->bands[band]->channels[j];
2756 wext_freq_not_found: ;
2759 /* No channels found? */
2765 /* Set real number of channels specified in creq->channels[] */
2766 creq->n_channels = i;
2768 /* translate "Scan for SSID" request */
2770 if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
2771 if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
2775 memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
2776 creq->ssids[0].ssid_len = wreq->essid_len;
2778 if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
2782 for (i = 0; i < NUM_NL80211_BANDS; i++)
2783 if (wiphy->bands[i])
2784 creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
2786 eth_broadcast_addr(creq->bssid);
2788 wiphy_lock(&rdev->wiphy);
2790 rdev->scan_req = creq;
2791 err = rdev_scan(rdev, creq);
2793 rdev->scan_req = NULL;
2794 /* creq will be freed below */
2796 nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
2797 /* creq now owned by driver */
2801 wiphy_unlock(&rdev->wiphy);
2806 EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
2808 static char *ieee80211_scan_add_ies(struct iw_request_info *info,
2809 const struct cfg80211_bss_ies *ies,
2810 char *current_ev, char *end_buf)
2812 const u8 *pos, *end, *next;
2813 struct iw_event iwe;
2819 * If needed, fragment the IEs buffer (at IE boundaries) into short
2820 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
2823 end = pos + ies->len;
2825 while (end - pos > IW_GENERIC_IE_MAX) {
2826 next = pos + 2 + pos[1];
2827 while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
2828 next = next + 2 + next[1];
2830 memset(&iwe, 0, sizeof(iwe));
2831 iwe.cmd = IWEVGENIE;
2832 iwe.u.data.length = next - pos;
2833 current_ev = iwe_stream_add_point_check(info, current_ev,
2836 if (IS_ERR(current_ev))
2842 memset(&iwe, 0, sizeof(iwe));
2843 iwe.cmd = IWEVGENIE;
2844 iwe.u.data.length = end - pos;
2845 current_ev = iwe_stream_add_point_check(info, current_ev,
2848 if (IS_ERR(current_ev))
2856 ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
2857 struct cfg80211_internal_bss *bss, char *current_ev,
2860 const struct cfg80211_bss_ies *ies;
2861 struct iw_event iwe;
2866 bool ismesh = false;
2868 memset(&iwe, 0, sizeof(iwe));
2869 iwe.cmd = SIOCGIWAP;
2870 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
2871 memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
2872 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2874 if (IS_ERR(current_ev))
2877 memset(&iwe, 0, sizeof(iwe));
2878 iwe.cmd = SIOCGIWFREQ;
2879 iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
2881 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2883 if (IS_ERR(current_ev))
2886 memset(&iwe, 0, sizeof(iwe));
2887 iwe.cmd = SIOCGIWFREQ;
2888 iwe.u.freq.m = bss->pub.channel->center_freq;
2890 current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
2892 if (IS_ERR(current_ev))
2895 if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
2896 memset(&iwe, 0, sizeof(iwe));
2898 iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
2899 IW_QUAL_NOISE_INVALID |
2900 IW_QUAL_QUAL_UPDATED;
2901 switch (wiphy->signal_type) {
2902 case CFG80211_SIGNAL_TYPE_MBM:
2903 sig = bss->pub.signal / 100;
2904 iwe.u.qual.level = sig;
2905 iwe.u.qual.updated |= IW_QUAL_DBM;
2906 if (sig < -110) /* rather bad */
2908 else if (sig > -40) /* perfect */
2910 /* will give a range of 0 .. 70 */
2911 iwe.u.qual.qual = sig + 110;
2913 case CFG80211_SIGNAL_TYPE_UNSPEC:
2914 iwe.u.qual.level = bss->pub.signal;
2915 /* will give range 0 .. 100 */
2916 iwe.u.qual.qual = bss->pub.signal;
2922 current_ev = iwe_stream_add_event_check(info, current_ev,
2925 if (IS_ERR(current_ev))
2929 memset(&iwe, 0, sizeof(iwe));
2930 iwe.cmd = SIOCGIWENCODE;
2931 if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
2932 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
2934 iwe.u.data.flags = IW_ENCODE_DISABLED;
2935 iwe.u.data.length = 0;
2936 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
2938 if (IS_ERR(current_ev))
2942 ies = rcu_dereference(bss->pub.ies);
2948 if (ie[1] > rem - 2)
2953 memset(&iwe, 0, sizeof(iwe));
2954 iwe.cmd = SIOCGIWESSID;
2955 iwe.u.data.length = ie[1];
2956 iwe.u.data.flags = 1;
2957 current_ev = iwe_stream_add_point_check(info,
2961 if (IS_ERR(current_ev))
2964 case WLAN_EID_MESH_ID:
2965 memset(&iwe, 0, sizeof(iwe));
2966 iwe.cmd = SIOCGIWESSID;
2967 iwe.u.data.length = ie[1];
2968 iwe.u.data.flags = 1;
2969 current_ev = iwe_stream_add_point_check(info,
2973 if (IS_ERR(current_ev))
2976 case WLAN_EID_MESH_CONFIG:
2978 if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
2981 memset(&iwe, 0, sizeof(iwe));
2982 iwe.cmd = IWEVCUSTOM;
2983 sprintf(buf, "Mesh Network Path Selection Protocol ID: "
2985 iwe.u.data.length = strlen(buf);
2986 current_ev = iwe_stream_add_point_check(info,
2990 if (IS_ERR(current_ev))
2992 sprintf(buf, "Path Selection Metric ID: 0x%02X",
2994 iwe.u.data.length = strlen(buf);
2995 current_ev = iwe_stream_add_point_check(info,
2999 if (IS_ERR(current_ev))
3001 sprintf(buf, "Congestion Control Mode ID: 0x%02X",
3003 iwe.u.data.length = strlen(buf);
3004 current_ev = iwe_stream_add_point_check(info,
3008 if (IS_ERR(current_ev))
3010 sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
3011 iwe.u.data.length = strlen(buf);
3012 current_ev = iwe_stream_add_point_check(info,
3016 if (IS_ERR(current_ev))
3018 sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
3019 iwe.u.data.length = strlen(buf);
3020 current_ev = iwe_stream_add_point_check(info,
3024 if (IS_ERR(current_ev))
3026 sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
3027 iwe.u.data.length = strlen(buf);
3028 current_ev = iwe_stream_add_point_check(info,
3032 if (IS_ERR(current_ev))
3034 sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
3035 iwe.u.data.length = strlen(buf);
3036 current_ev = iwe_stream_add_point_check(info,
3040 if (IS_ERR(current_ev))
3043 case WLAN_EID_SUPP_RATES:
3044 case WLAN_EID_EXT_SUPP_RATES:
3045 /* display all supported rates in readable format */
3046 p = current_ev + iwe_stream_lcp_len(info);
3048 memset(&iwe, 0, sizeof(iwe));
3049 iwe.cmd = SIOCGIWRATE;
3050 /* Those two flags are ignored... */
3051 iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
3053 for (i = 0; i < ie[1]; i++) {
3054 iwe.u.bitrate.value =
3055 ((ie[i + 2] & 0x7f) * 500000);
3057 p = iwe_stream_add_value(info, current_ev, p,
3061 current_ev = ERR_PTR(-E2BIG);
3072 if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
3074 memset(&iwe, 0, sizeof(iwe));
3075 iwe.cmd = SIOCGIWMODE;
3077 iwe.u.mode = IW_MODE_MESH;
3078 else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
3079 iwe.u.mode = IW_MODE_MASTER;
3081 iwe.u.mode = IW_MODE_ADHOC;
3082 current_ev = iwe_stream_add_event_check(info, current_ev,
3085 if (IS_ERR(current_ev))
3089 memset(&iwe, 0, sizeof(iwe));
3090 iwe.cmd = IWEVCUSTOM;
3091 sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
3092 iwe.u.data.length = strlen(buf);
3093 current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
3095 if (IS_ERR(current_ev))
3097 memset(&iwe, 0, sizeof(iwe));
3098 iwe.cmd = IWEVCUSTOM;
3099 sprintf(buf, " Last beacon: %ums ago",
3100 elapsed_jiffies_msecs(bss->ts));
3101 iwe.u.data.length = strlen(buf);
3102 current_ev = iwe_stream_add_point_check(info, current_ev,
3103 end_buf, &iwe, buf);
3104 if (IS_ERR(current_ev))
3107 current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
3115 static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
3116 struct iw_request_info *info,
3117 char *buf, size_t len)
3119 char *current_ev = buf;
3120 char *end_buf = buf + len;
3121 struct cfg80211_internal_bss *bss;
3124 spin_lock_bh(&rdev->bss_lock);
3125 cfg80211_bss_expire(rdev);
3127 list_for_each_entry(bss, &rdev->bss_list, list) {
3128 if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
3132 current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
3133 current_ev, end_buf);
3134 if (IS_ERR(current_ev)) {
3135 err = PTR_ERR(current_ev);
3139 spin_unlock_bh(&rdev->bss_lock);
3143 return current_ev - buf;
3147 int cfg80211_wext_giwscan(struct net_device *dev,
3148 struct iw_request_info *info,
3149 struct iw_point *data, char *extra)
3151 struct cfg80211_registered_device *rdev;
3154 if (!netif_running(dev))
3157 rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
3160 return PTR_ERR(rdev);
3162 if (rdev->scan_req || rdev->scan_msg)
3165 res = ieee80211_scan_results(rdev, info, extra, data->length);
3174 EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan);