Adding upstream version 5.10.209.upstream/5.10.209upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 3244 insertions, 0 deletions

diff --git a/net/wireless/scan.c b/net/wireless/scan.c
new file mode 100644
index 000000000..1e6dfe204
--- /dev/null
+++ b/net/wireless/scan.c
@@ -0,0 +1,3244 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * cfg80211 scan result handling
+ *
+ * Copyright 2008 Johannes Berg <johannes@sipsolutions.net>
+ * Copyright 2013-2014  Intel Mobile Communications GmbH
+ * Copyright 2016	Intel Deutschland GmbH
+ * Copyright (C) 2018-2020 Intel Corporation
+ */
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/netdevice.h>
+#include <linux/wireless.h>
+#include <linux/nl80211.h>
+#include <linux/etherdevice.h>
+#include <linux/crc32.h>
+#include <linux/bitfield.h>
+#include <net/arp.h>
+#include <net/cfg80211.h>
+#include <net/cfg80211-wext.h>
+#include <net/iw_handler.h>
+#include "core.h"
+#include "nl80211.h"
+#include "wext-compat.h"
+#include "rdev-ops.h"
+
+/**
+ * DOC: BSS tree/list structure
+ *
+ * At the top level, the BSS list is kept in both a list in each
+ * registered device (@bss_list) as well as an RB-tree for faster
+ * lookup. In the RB-tree, entries can be looked up using their
+ * channel, MESHID, MESHCONF (for MBSSes) or channel, BSSID, SSID
+ * for other BSSes.
+ *
+ * Due to the possibility of hidden SSIDs, there's a second level
+ * structure, the "hidden_list" and "hidden_beacon_bss" pointer.
+ * The hidden_list connects all BSSes belonging to a single AP
+ * that has a hidden SSID, and connects beacon and probe response
+ * entries. For a probe response entry for a hidden SSID, the
+ * hidden_beacon_bss pointer points to the BSS struct holding the
+ * beacon's information.
+ *
+ * Reference counting is done for all these references except for
+ * the hidden_list, so that a beacon BSS struct that is otherwise
+ * not referenced has one reference for being on the bss_list and
+ * one for each probe response entry that points to it using the
+ * hidden_beacon_bss pointer. When a BSS struct that has such a
+ * pointer is get/put, the refcount update is also propagated to
+ * the referenced struct, this ensure that it cannot get removed
+ * while somebody is using the probe response version.
+ *
+ * Note that the hidden_beacon_bss pointer never changes, due to
+ * the reference counting. Therefore, no locking is needed for
+ * it.
+ *
+ * Also note that the hidden_beacon_bss pointer is only relevant
+ * if the driver uses something other than the IEs, e.g. private
+ * data stored in the BSS struct, since the beacon IEs are
+ * also linked into the probe response struct.
+ */
+
+/*
+ * Limit the number of BSS entries stored in mac80211. Each one is
+ * a bit over 4k at most, so this limits to roughly 4-5M of memory.
+ * If somebody wants to really attack this though, they'd likely
+ * use small beacons, and only one type of frame, limiting each of
+ * the entries to a much smaller size (in order to generate more
+ * entries in total, so overhead is bigger.)
+ */
+static int bss_entries_limit = 1000;
+module_param(bss_entries_limit, int, 0644);
+MODULE_PARM_DESC(bss_entries_limit,
+                 "limit to number of scan BSS entries (per wiphy, default 1000)");
+
+#define IEEE80211_SCAN_RESULT_EXPIRE	(30 * HZ)
+
+/**
+ * struct cfg80211_colocated_ap - colocated AP information
+ *
+ * @list: linked list to all colocated aPS
+ * @bssid: BSSID of the reported AP
+ * @ssid: SSID of the reported AP
+ * @ssid_len: length of the ssid
+ * @center_freq: frequency the reported AP is on
+ * @unsolicited_probe: the reported AP is part of an ESS, where all the APs
+ *	that operate in the same channel as the reported AP and that might be
+ *	detected by a STA receiving this frame, are transmitting unsolicited
+ *	Probe Response frames every 20 TUs
+ * @oct_recommended: OCT is recommended to exchange MMPDUs with the reported AP
+ * @same_ssid: the reported AP has the same SSID as the reporting AP
+ * @multi_bss: the reported AP is part of a multiple BSSID set
+ * @transmitted_bssid: the reported AP is the transmitting BSSID
+ * @colocated_ess: all the APs that share the same ESS as the reported AP are
+ *	colocated and can be discovered via legacy bands.
+ * @short_ssid_valid: short_ssid is valid and can be used
+ * @short_ssid: the short SSID for this SSID
+ */
+struct cfg80211_colocated_ap {
+	struct list_head list;
+	u8 bssid[ETH_ALEN];
+	u8 ssid[IEEE80211_MAX_SSID_LEN];
+	size_t ssid_len;
+	u32 short_ssid;
+	u32 center_freq;
+	u8 unsolicited_probe:1,
+	   oct_recommended:1,
+	   same_ssid:1,
+	   multi_bss:1,
+	   transmitted_bssid:1,
+	   colocated_ess:1,
+	   short_ssid_valid:1;
+};
+
+static void bss_free(struct cfg80211_internal_bss *bss)
+{
+	struct cfg80211_bss_ies *ies;
+
+	if (WARN_ON(atomic_read(&bss->hold)))
+		return;
+
+	ies = (void *)rcu_access_pointer(bss->pub.beacon_ies);
+	if (ies && !bss->pub.hidden_beacon_bss)
+		kfree_rcu(ies, rcu_head);
+	ies = (void *)rcu_access_pointer(bss->pub.proberesp_ies);
+	if (ies)
+		kfree_rcu(ies, rcu_head);
+
+	/*
+	 * This happens when the module is removed, it doesn't
+	 * really matter any more save for completeness
+	 */
+	if (!list_empty(&bss->hidden_list))
+		list_del(&bss->hidden_list);
+
+	kfree(bss);
+}
+
+static inline void bss_ref_get(struct cfg80211_registered_device *rdev,
+			       struct cfg80211_internal_bss *bss)
+{
+	lockdep_assert_held(&rdev->bss_lock);
+
+	bss->refcount++;
+
+	if (bss->pub.hidden_beacon_bss)
+		bss_from_pub(bss->pub.hidden_beacon_bss)->refcount++;
+
+	if (bss->pub.transmitted_bss)
+		bss_from_pub(bss->pub.transmitted_bss)->refcount++;
+}
+
+static inline void bss_ref_put(struct cfg80211_registered_device *rdev,
+			       struct cfg80211_internal_bss *bss)
+{
+	lockdep_assert_held(&rdev->bss_lock);
+
+	if (bss->pub.hidden_beacon_bss) {
+		struct cfg80211_internal_bss *hbss;
+		hbss = container_of(bss->pub.hidden_beacon_bss,
+				    struct cfg80211_internal_bss,
+				    pub);
+		hbss->refcount--;
+		if (hbss->refcount == 0)
+			bss_free(hbss);
+	}
+
+	if (bss->pub.transmitted_bss) {
+		struct cfg80211_internal_bss *tbss;
+
+		tbss = container_of(bss->pub.transmitted_bss,
+				    struct cfg80211_internal_bss,
+				    pub);
+		tbss->refcount--;
+		if (tbss->refcount == 0)
+			bss_free(tbss);
+	}
+
+	bss->refcount--;
+	if (bss->refcount == 0)
+		bss_free(bss);
+}
+
+static bool __cfg80211_unlink_bss(struct cfg80211_registered_device *rdev,
+				  struct cfg80211_internal_bss *bss)
+{
+	lockdep_assert_held(&rdev->bss_lock);
+
+	if (!list_empty(&bss->hidden_list)) {
+		/*
+		 * don't remove the beacon entry if it has
+		 * probe responses associated with it
+		 */
+		if (!bss->pub.hidden_beacon_bss)
+			return false;
+		/*
+		 * if it's a probe response entry break its
+		 * link to the other entries in the group
+		 */
+		list_del_init(&bss->hidden_list);
+	}
+
+	list_del_init(&bss->list);
+	list_del_init(&bss->pub.nontrans_list);
+	rb_erase(&bss->rbn, &rdev->bss_tree);
+	rdev->bss_entries--;
+	WARN_ONCE((rdev->bss_entries == 0) ^ list_empty(&rdev->bss_list),
+		  "rdev bss entries[%d]/list[empty:%d] corruption\n",
+		  rdev->bss_entries, list_empty(&rdev->bss_list));
+	bss_ref_put(rdev, bss);
+	return true;
+}
+
+bool cfg80211_is_element_inherited(const struct element *elem,
+				   const struct element *non_inherit_elem)
+{
+	u8 id_len, ext_id_len, i, loop_len, id;
+	const u8 *list;
+
+	if (elem->id == WLAN_EID_MULTIPLE_BSSID)
+		return false;
+
+	if (!non_inherit_elem || non_inherit_elem->datalen < 2)
+		return true;
+
+	/*
+	 * non inheritance element format is:
+	 * ext ID (56) | IDs list len | list | extension IDs list len | list
+	 * Both lists are optional. Both lengths are mandatory.
+	 * This means valid length is:
+	 * elem_len = 1 (extension ID) + 2 (list len fields) + list lengths
+	 */
+	id_len = non_inherit_elem->data[1];
+	if (non_inherit_elem->datalen < 3 + id_len)
+		return true;
+
+	ext_id_len = non_inherit_elem->data[2 + id_len];
+	if (non_inherit_elem->datalen < 3 + id_len + ext_id_len)
+		return true;
+
+	if (elem->id == WLAN_EID_EXTENSION) {
+		if (!ext_id_len)
+			return true;
+		loop_len = ext_id_len;
+		list = &non_inherit_elem->data[3 + id_len];
+		id = elem->data[0];
+	} else {
+		if (!id_len)
+			return true;
+		loop_len = id_len;
+		list = &non_inherit_elem->data[2];
+		id = elem->id;
+	}
+
+	for (i = 0; i < loop_len; i++) {
+		if (list[i] == id)
+			return false;
+	}
+
+	return true;
+}
+EXPORT_SYMBOL(cfg80211_is_element_inherited);
+
+static size_t cfg80211_copy_elem_with_frags(const struct element *elem,
+					    const u8 *ie, size_t ie_len,
+					    u8 **pos, u8 *buf, size_t buf_len)
+{
+	if (WARN_ON((u8 *)elem < ie || elem->data > ie + ie_len ||
+		    elem->data + elem->datalen > ie + ie_len))
+		return 0;
+
+	if (elem->datalen + 2 > buf + buf_len - *pos)
+		return 0;
+
+	memcpy(*pos, elem, elem->datalen + 2);
+	*pos += elem->datalen + 2;
+
+	/* Finish if it is not fragmented  */
+	if (elem->datalen != 255)
+		return *pos - buf;
+
+	ie_len = ie + ie_len - elem->data - elem->datalen;
+	ie = (const u8 *)elem->data + elem->datalen;
+
+	for_each_element(elem, ie, ie_len) {
+		if (elem->id != WLAN_EID_FRAGMENT)
+			break;
+
+		if (elem->datalen + 2 > buf + buf_len - *pos)
+			return 0;
+
+		memcpy(*pos, elem, elem->datalen + 2);
+		*pos += elem->datalen + 2;
+
+		if (elem->datalen != 255)
+			break;
+	}
+
+	return *pos - buf;
+}
+
+static size_t cfg80211_gen_new_ie(const u8 *ie, size_t ielen,
+				  const u8 *subie, size_t subie_len,
+				  u8 *new_ie, size_t new_ie_len)
+{
+	const struct element *non_inherit_elem, *parent, *sub;
+	u8 *pos = new_ie;
+	u8 id, ext_id;
+	unsigned int match_len;
+
+	non_inherit_elem = cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE,
+						  subie, subie_len);
+
+	/* We copy the elements one by one from the parent to the generated
+	 * elements.
+	 * If they are not inherited (included in subie or in the non
+	 * inheritance element), then we copy all occurrences the first time
+	 * we see this element type.
+	 */
+	for_each_element(parent, ie, ielen) {
+		if (parent->id == WLAN_EID_FRAGMENT)
+			continue;
+
+		if (parent->id == WLAN_EID_EXTENSION) {
+			if (parent->datalen < 1)
+				continue;
+
+			id = WLAN_EID_EXTENSION;
+			ext_id = parent->data[0];
+			match_len = 1;
+		} else {
+			id = parent->id;
+			match_len = 0;
+		}
+
+		/* Find first occurrence in subie */
+		sub = cfg80211_find_elem_match(id, subie, subie_len,
+					       &ext_id, match_len, 0);
+
+		/* Copy from parent if not in subie and inherited */
+		if (!sub &&
+		    cfg80211_is_element_inherited(parent, non_inherit_elem)) {
+			if (!cfg80211_copy_elem_with_frags(parent,
+							   ie, ielen,
+							   &pos, new_ie,
+							   new_ie_len))
+				return 0;
+
+			continue;
+		}
+
+		/* Already copied if an earlier element had the same type */
+		if (cfg80211_find_elem_match(id, ie, (u8 *)parent - ie,
+					     &ext_id, match_len, 0))
+			continue;
+
+		/* Not inheriting, copy all similar elements from subie */
+		while (sub) {
+			if (!cfg80211_copy_elem_with_frags(sub,
+							   subie, subie_len,
+							   &pos, new_ie,
+							   new_ie_len))
+				return 0;
+
+			sub = cfg80211_find_elem_match(id,
+						       sub->data + sub->datalen,
+						       subie_len + subie -
+						       (sub->data +
+							sub->datalen),
+						       &ext_id, match_len, 0);
+		}
+	}
+
+	/* The above misses elements that are included in subie but not in the
+	 * parent, so do a pass over subie and append those.
+	 * Skip the non-tx BSSID caps and non-inheritance element.
+	 */
+	for_each_element(sub, subie, subie_len) {
+		if (sub->id == WLAN_EID_NON_TX_BSSID_CAP)
+			continue;
+
+		if (sub->id == WLAN_EID_FRAGMENT)
+			continue;
+
+		if (sub->id == WLAN_EID_EXTENSION) {
+			if (sub->datalen < 1)
+				continue;
+
+			id = WLAN_EID_EXTENSION;
+			ext_id = sub->data[0];
+			match_len = 1;
+
+			if (ext_id == WLAN_EID_EXT_NON_INHERITANCE)
+				continue;
+		} else {
+			id = sub->id;
+			match_len = 0;
+		}
+
+		/* Processed if one was included in the parent */
+		if (cfg80211_find_elem_match(id, ie, ielen,
+					     &ext_id, match_len, 0))
+			continue;
+
+		if (!cfg80211_copy_elem_with_frags(sub, subie, subie_len,
+						   &pos, new_ie, new_ie_len))
+			return 0;
+	}
+
+	return pos - new_ie;
+}
+
+static bool is_bss(struct cfg80211_bss *a, const u8 *bssid,
+		   const u8 *ssid, size_t ssid_len)
+{
+	const struct cfg80211_bss_ies *ies;
+	const u8 *ssidie;
+
+	if (bssid && !ether_addr_equal(a->bssid, bssid))
+		return false;
+
+	if (!ssid)
+		return true;
+
+	ies = rcu_access_pointer(a->ies);
+	if (!ies)
+		return false;
+	ssidie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
+	if (!ssidie)
+		return false;
+	if (ssidie[1] != ssid_len)
+		return false;
+	return memcmp(ssidie + 2, ssid, ssid_len) == 0;
+}
+
+static int
+cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss,
+			   struct cfg80211_bss *nontrans_bss)
+{
+	const u8 *ssid;
+	size_t ssid_len;
+	struct cfg80211_bss *bss = NULL;
+
+	rcu_read_lock();
+	ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
+	if (!ssid) {
+		rcu_read_unlock();
+		return -EINVAL;
+	}
+	ssid_len = ssid[1];
+	ssid = ssid + 2;
+
+	/* check if nontrans_bss is in the list */
+	list_for_each_entry(bss, &trans_bss->nontrans_list, nontrans_list) {
+		if (is_bss(bss, nontrans_bss->bssid, ssid, ssid_len)) {
+			rcu_read_unlock();
+			return 0;
+		}
+	}
+
+	rcu_read_unlock();
+
+	/*
+	 * This is a bit weird - it's not on the list, but already on another
+	 * one! The only way that could happen is if there's some BSSID/SSID
+	 * shared by multiple APs in their multi-BSSID profiles, potentially
+	 * with hidden SSID mixed in ... ignore it.
+	 */
+	if (!list_empty(&nontrans_bss->nontrans_list))
+		return -EINVAL;
+
+	/* add to the list */
+	list_add_tail(&nontrans_bss->nontrans_list, &trans_bss->nontrans_list);
+	return 0;
+}
+
+static void __cfg80211_bss_expire(struct cfg80211_registered_device *rdev,
+				  unsigned long expire_time)
+{
+	struct cfg80211_internal_bss *bss, *tmp;
+	bool expired = false;
+
+	lockdep_assert_held(&rdev->bss_lock);
+
+	list_for_each_entry_safe(bss, tmp, &rdev->bss_list, list) {
+		if (atomic_read(&bss->hold))
+			continue;
+		if (!time_after(expire_time, bss->ts))
+			continue;
+
+		if (__cfg80211_unlink_bss(rdev, bss))
+			expired = true;
+	}
+
+	if (expired)
+		rdev->bss_generation++;
+}
+
+static bool cfg80211_bss_expire_oldest(struct cfg80211_registered_device *rdev)
+{
+	struct cfg80211_internal_bss *bss, *oldest = NULL;
+	bool ret;
+
+	lockdep_assert_held(&rdev->bss_lock);
+
+	list_for_each_entry(bss, &rdev->bss_list, list) {
+		if (atomic_read(&bss->hold))
+			continue;
+
+		if (!list_empty(&bss->hidden_list) &&
+		    !bss->pub.hidden_beacon_bss)
+			continue;
+
+		if (oldest && time_before(oldest->ts, bss->ts))
+			continue;
+		oldest = bss;
+	}
+
+	if (WARN_ON(!oldest))
+		return false;
+
+	/*
+	 * The callers make sure to increase rdev->bss_generation if anything
+	 * gets removed (and a new entry added), so there's no need to also do
+	 * it here.
+	 */
+
+	ret = __cfg80211_unlink_bss(rdev, oldest);
+	WARN_ON(!ret);
+	return ret;
+}
+
+static u8 cfg80211_parse_bss_param(u8 data,
+				   struct cfg80211_colocated_ap *coloc_ap)
+{
+	coloc_ap->oct_recommended =
+		u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_OCT_RECOMMENDED);
+	coloc_ap->same_ssid =
+		u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_SAME_SSID);
+	coloc_ap->multi_bss =
+		u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_MULTI_BSSID);
+	coloc_ap->transmitted_bssid =
+		u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_TRANSMITTED_BSSID);
+	coloc_ap->unsolicited_probe =
+		u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_PROBE_ACTIVE);
+	coloc_ap->colocated_ess =
+		u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_ESS);
+
+	return u8_get_bits(data, IEEE80211_RNR_TBTT_PARAMS_COLOC_AP);
+}
+
+static int cfg80211_calc_short_ssid(const struct cfg80211_bss_ies *ies,
+				    const struct element **elem, u32 *s_ssid)
+{
+
+	*elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len);
+	if (!*elem || (*elem)->datalen > IEEE80211_MAX_SSID_LEN)
+		return -EINVAL;
+
+	*s_ssid = ~crc32_le(~0, (*elem)->data, (*elem)->datalen);
+	return 0;
+}
+
+static void cfg80211_free_coloc_ap_list(struct list_head *coloc_ap_list)
+{
+	struct cfg80211_colocated_ap *ap, *tmp_ap;
+
+	list_for_each_entry_safe(ap, tmp_ap, coloc_ap_list, list) {
+		list_del(&ap->list);
+		kfree(ap);
+	}
+}
+
+static int cfg80211_parse_ap_info(struct cfg80211_colocated_ap *entry,
+				  const u8 *pos, u8 length,
+				  const struct element *ssid_elem,
+				  int s_ssid_tmp)
+{
+	/* skip the TBTT offset */
+	pos++;
+
+	memcpy(entry->bssid, pos, ETH_ALEN);
+	pos += ETH_ALEN;
+
+	if (length == IEEE80211_TBTT_INFO_OFFSET_BSSID_SSSID_BSS_PARAM) {
+		memcpy(&entry->short_ssid, pos,
+		       sizeof(entry->short_ssid));
+		entry->short_ssid_valid = true;
+		pos += 4;
+	}
+
+	/* skip non colocated APs */
+	if (!cfg80211_parse_bss_param(*pos, entry))
+		return -EINVAL;
+	pos++;
+
+	if (length == IEEE80211_TBTT_INFO_OFFSET_BSSID_BSS_PARAM) {
+		/*
+		 * no information about the short ssid. Consider the entry valid
+		 * for now. It would later be dropped in case there are explicit
+		 * SSIDs that need to be matched
+		 */
+		if (!entry->same_ssid)
+			return 0;
+	}
+
+	if (entry->same_ssid) {
+		entry->short_ssid = s_ssid_tmp;
+		entry->short_ssid_valid = true;
+
+		/*
+		 * This is safe because we validate datalen in
+		 * cfg80211_parse_colocated_ap(), before calling this
+		 * function.
+		 */
+		memcpy(&entry->ssid, &ssid_elem->data,
+		       ssid_elem->datalen);
+		entry->ssid_len = ssid_elem->datalen;
+	}
+	return 0;
+}
+
+static int cfg80211_parse_colocated_ap(const struct cfg80211_bss_ies *ies,
+				       struct list_head *list)
+{
+	struct ieee80211_neighbor_ap_info *ap_info;
+	const struct element *elem, *ssid_elem;
+	const u8 *pos, *end;
+	u32 s_ssid_tmp;
+	int n_coloc = 0, ret;
+	LIST_HEAD(ap_list);
+
+	elem = cfg80211_find_elem(WLAN_EID_REDUCED_NEIGHBOR_REPORT, ies->data,
+				  ies->len);
+	if (!elem || elem->datalen > IEEE80211_MAX_SSID_LEN)
+		return 0;
+
+	pos = elem->data;
+	end = pos + elem->datalen;
+
+	ret = cfg80211_calc_short_ssid(ies, &ssid_elem, &s_ssid_tmp);
+	if (ret)
+		return 0;
+
+	/* RNR IE may contain more than one NEIGHBOR_AP_INFO */
+	while (pos + sizeof(*ap_info) <= end) {
+		enum nl80211_band band;
+		int freq;
+		u8 length, i, count;
+
+		ap_info = (void *)pos;
+		count = u8_get_bits(ap_info->tbtt_info_hdr,
+				    IEEE80211_AP_INFO_TBTT_HDR_COUNT) + 1;
+		length = ap_info->tbtt_info_len;
+
+		pos += sizeof(*ap_info);
+
+		if (!ieee80211_operating_class_to_band(ap_info->op_class,
+						       &band))
+			break;
+
+		freq = ieee80211_channel_to_frequency(ap_info->channel, band);
+
+		if (end - pos < count * ap_info->tbtt_info_len)
+			break;
+
+		/*
+		 * TBTT info must include bss param + BSSID +
+		 * (short SSID or same_ssid bit to be set).
+		 * ignore other options, and move to the
+		 * next AP info
+		 */
+		if (band != NL80211_BAND_6GHZ ||
+		    (length != IEEE80211_TBTT_INFO_OFFSET_BSSID_BSS_PARAM &&
+		     length < IEEE80211_TBTT_INFO_OFFSET_BSSID_SSSID_BSS_PARAM)) {
+			pos += count * ap_info->tbtt_info_len;
+			continue;
+		}
+
+		for (i = 0; i < count; i++) {
+			struct cfg80211_colocated_ap *entry;
+
+			entry = kzalloc(sizeof(*entry) + IEEE80211_MAX_SSID_LEN,
+					GFP_ATOMIC);
+
+			if (!entry)
+				break;
+
+			entry->center_freq = freq;
+
+			if (!cfg80211_parse_ap_info(entry, pos, length,
+						    ssid_elem, s_ssid_tmp)) {
+				n_coloc++;
+				list_add_tail(&entry->list, &ap_list);
+			} else {
+				kfree(entry);
+			}
+
+			pos += ap_info->tbtt_info_len;
+		}
+	}
+
+	if (pos != end) {
+		cfg80211_free_coloc_ap_list(&ap_list);
+		return 0;
+	}
+
+	list_splice_tail(&ap_list, list);
+	return n_coloc;
+}
+
+static  void cfg80211_scan_req_add_chan(struct cfg80211_scan_request *request,
+					struct ieee80211_channel *chan,
+					bool add_to_6ghz)
+{
+	int i;
+	u32 n_channels = request->n_channels;
+	struct cfg80211_scan_6ghz_params *params =
+		&request->scan_6ghz_params[request->n_6ghz_params];
+
+	for (i = 0; i < n_channels; i++) {
+		if (request->channels[i] == chan) {
+			if (add_to_6ghz)
+				params->channel_idx = i;
+			return;
+		}
+	}
+
+	request->channels[n_channels] = chan;
+	if (add_to_6ghz)
+		request->scan_6ghz_params[request->n_6ghz_params].channel_idx =
+			n_channels;
+
+	request->n_channels++;
+}
+
+static bool cfg80211_find_ssid_match(struct cfg80211_colocated_ap *ap,
+				     struct cfg80211_scan_request *request)
+{
+	int i;
+	u32 s_ssid;
+
+	for (i = 0; i < request->n_ssids; i++) {
+		/* wildcard ssid in the scan request */
+		if (!request->ssids[i].ssid_len) {
+			if (ap->multi_bss && !ap->transmitted_bssid)
+				continue;
+
+			return true;
+		}
+
+		if (ap->ssid_len &&
+		    ap->ssid_len == request->ssids[i].ssid_len) {
+			if (!memcmp(request->ssids[i].ssid, ap->ssid,
+				    ap->ssid_len))
+				return true;
+		} else if (ap->short_ssid_valid) {
+			s_ssid = ~crc32_le(~0, request->ssids[i].ssid,
+					   request->ssids[i].ssid_len);
+
+			if (ap->short_ssid == s_ssid)
+				return true;
+		}
+	}
+
+	return false;
+}
+
+static int cfg80211_scan_6ghz(struct cfg80211_registered_device *rdev)
+{
+	u8 i;
+	struct cfg80211_colocated_ap *ap;
+	int n_channels, count = 0, err;
+	struct cfg80211_scan_request *request, *rdev_req = rdev->scan_req;
+	LIST_HEAD(coloc_ap_list);
+	bool need_scan_psc;
+	const struct ieee80211_sband_iftype_data *iftd;
+
+	rdev_req->scan_6ghz = true;
+
+	if (!rdev->wiphy.bands[NL80211_BAND_6GHZ])
+		return -EOPNOTSUPP;
+
+	iftd = ieee80211_get_sband_iftype_data(rdev->wiphy.bands[NL80211_BAND_6GHZ],
+					       rdev_req->wdev->iftype);
+	if (!iftd || !iftd->he_cap.has_he)
+		return -EOPNOTSUPP;
+
+	n_channels = rdev->wiphy.bands[NL80211_BAND_6GHZ]->n_channels;
+
+	if (rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ) {
+		struct cfg80211_internal_bss *intbss;
+
+		spin_lock_bh(&rdev->bss_lock);
+		list_for_each_entry(intbss, &rdev->bss_list, list) {
+			struct cfg80211_bss *res = &intbss->pub;
+			const struct cfg80211_bss_ies *ies;
+
+			ies = rcu_access_pointer(res->ies);
+			count += cfg80211_parse_colocated_ap(ies,
+							     &coloc_ap_list);
+		}
+		spin_unlock_bh(&rdev->bss_lock);
+	}
+
+	request = kzalloc(struct_size(request, channels, n_channels) +
+			  sizeof(*request->scan_6ghz_params) * count,
+			  GFP_KERNEL);
+	if (!request) {
+		cfg80211_free_coloc_ap_list(&coloc_ap_list);
+		return -ENOMEM;
+	}
+
+	*request = *rdev_req;
+	request->n_channels = 0;
+	request->scan_6ghz_params =
+		(void *)&request->channels[n_channels];
+
+	/*
+	 * PSC channels should not be scanned if all the reported co-located APs
+	 * are indicating that all APs in the same ESS are co-located
+	 */
+	if (count) {
+		need_scan_psc = false;
+
+		list_for_each_entry(ap, &coloc_ap_list, list) {
+			if (!ap->colocated_ess) {
+				need_scan_psc = true;
+				break;
+			}
+		}
+	} else {
+		need_scan_psc = true;
+	}
+
+	/*
+	 * add to the scan request the channels that need to be scanned
+	 * regardless of the collocated APs (PSC channels or all channels
+	 * in case that NL80211_SCAN_FLAG_COLOCATED_6GHZ is not set)
+	 */
+	for (i = 0; i < rdev_req->n_channels; i++) {
+		if (rdev_req->channels[i]->band == NL80211_BAND_6GHZ &&
+		    ((need_scan_psc &&
+		      cfg80211_channel_is_psc(rdev_req->channels[i])) ||
+		     !(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))) {
+			cfg80211_scan_req_add_chan(request,
+						   rdev_req->channels[i],
+						   false);
+		}
+	}
+
+	if (!(rdev_req->flags & NL80211_SCAN_FLAG_COLOCATED_6GHZ))
+		goto skip;
+
+	list_for_each_entry(ap, &coloc_ap_list, list) {
+		bool found = false;
+		struct cfg80211_scan_6ghz_params *scan_6ghz_params =
+			&request->scan_6ghz_params[request->n_6ghz_params];
+		struct ieee80211_channel *chan =
+			ieee80211_get_channel(&rdev->wiphy, ap->center_freq);
+
+		if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
+			continue;
+
+		for (i = 0; i < rdev_req->n_channels; i++) {
+			if (rdev_req->channels[i] == chan)
+				found = true;
+		}
+
+		if (!found)
+			continue;
+
+		if (request->n_ssids > 0 &&
+		    !cfg80211_find_ssid_match(ap, request))
+			continue;
+
+		if (!is_broadcast_ether_addr(request->bssid) &&
+		    !ether_addr_equal(request->bssid, ap->bssid))
+			continue;
+
+		if (!request->n_ssids && ap->multi_bss && !ap->transmitted_bssid)
+			continue;
+
+		cfg80211_scan_req_add_chan(request, chan, true);
+		memcpy(scan_6ghz_params->bssid, ap->bssid, ETH_ALEN);
+		scan_6ghz_params->short_ssid = ap->short_ssid;
+		scan_6ghz_params->short_ssid_valid = ap->short_ssid_valid;
+		scan_6ghz_params->unsolicited_probe = ap->unsolicited_probe;
+
+		/*
+		 * If a PSC channel is added to the scan and 'need_scan_psc' is
+		 * set to false, then all the APs that the scan logic is
+		 * interested with on the channel are collocated and thus there
+		 * is no need to perform the initial PSC channel listen.
+		 */
+		if (cfg80211_channel_is_psc(chan) && !need_scan_psc)
+			scan_6ghz_params->psc_no_listen = true;
+
+		request->n_6ghz_params++;
+	}
+
+skip:
+	cfg80211_free_coloc_ap_list(&coloc_ap_list);
+
+	if (request->n_channels) {
+		struct cfg80211_scan_request *old = rdev->int_scan_req;
+
+		rdev->int_scan_req = request;
+
+		/*
+		 * If this scan follows a previous scan, save the scan start
+		 * info from the first part of the scan
+		 */
+		if (old)
+			rdev->int_scan_req->info = old->info;
+
+		err = rdev_scan(rdev, request);
+		if (err) {
+			rdev->int_scan_req = old;
+			kfree(request);
+		} else {
+			kfree(old);
+		}
+
+		return err;
+	}
+
+	kfree(request);
+	return -EINVAL;
+}
+
+int cfg80211_scan(struct cfg80211_registered_device *rdev)
+{
+	struct cfg80211_scan_request *request;
+	struct cfg80211_scan_request *rdev_req = rdev->scan_req;
+	u32 n_channels = 0, idx, i;
+
+	if (!(rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ))
+		return rdev_scan(rdev, rdev_req);
+
+	for (i = 0; i < rdev_req->n_channels; i++) {
+		if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ)
+			n_channels++;
+	}
+
+	if (!n_channels)
+		return cfg80211_scan_6ghz(rdev);
+
+	request = kzalloc(struct_size(request, channels, n_channels),
+			  GFP_KERNEL);
+	if (!request)
+		return -ENOMEM;
+
+	*request = *rdev_req;
+	request->n_channels = n_channels;
+
+	for (i = idx = 0; i < rdev_req->n_channels; i++) {
+		if (rdev_req->channels[i]->band != NL80211_BAND_6GHZ)
+			request->channels[idx++] = rdev_req->channels[i];
+	}
+
+	rdev_req->scan_6ghz = false;
+	rdev->int_scan_req = request;
+	return rdev_scan(rdev, request);
+}
+
+void ___cfg80211_scan_done(struct cfg80211_registered_device *rdev,
+			   bool send_message)
+{
+	struct cfg80211_scan_request *request, *rdev_req;
+	struct wireless_dev *wdev;
+	struct sk_buff *msg;
+#ifdef CONFIG_CFG80211_WEXT
+	union iwreq_data wrqu;
+#endif
+
+	ASSERT_RTNL();
+
+	if (rdev->scan_msg) {
+		nl80211_send_scan_msg(rdev, rdev->scan_msg);
+		rdev->scan_msg = NULL;
+		return;
+	}
+
+	rdev_req = rdev->scan_req;
+	if (!rdev_req)
+		return;
+
+	wdev = rdev_req->wdev;
+	request = rdev->int_scan_req ? rdev->int_scan_req : rdev_req;
+
+	if (wdev_running(wdev) &&
+	    (rdev->wiphy.flags & WIPHY_FLAG_SPLIT_SCAN_6GHZ) &&
+	    !rdev_req->scan_6ghz && !request->info.aborted &&
+	    !cfg80211_scan_6ghz(rdev))
+		return;
+
+	/*
+	 * This must be before sending the other events!
+	 * Otherwise, wpa_supplicant gets completely confused with
+	 * wext events.
+	 */
+	if (wdev->netdev)
+		cfg80211_sme_scan_done(wdev->netdev);
+
+	if (!request->info.aborted &&
+	    request->flags & NL80211_SCAN_FLAG_FLUSH) {
+		/* flush entries from previous scans */
+		spin_lock_bh(&rdev->bss_lock);
+		__cfg80211_bss_expire(rdev, request->scan_start);
+		spin_unlock_bh(&rdev->bss_lock);
+	}
+
+	msg = nl80211_build_scan_msg(rdev, wdev, request->info.aborted);
+
+#ifdef CONFIG_CFG80211_WEXT
+	if (wdev->netdev && !request->info.aborted) {
+		memset(&wrqu, 0, sizeof(wrqu));
+
+		wireless_send_event(wdev->netdev, SIOCGIWSCAN, &wrqu, NULL);
+	}
+#endif
+
+	if (wdev->netdev)
+		dev_put(wdev->netdev);
+
+	kfree(rdev->int_scan_req);
+	rdev->int_scan_req = NULL;
+
+	kfree(rdev->scan_req);
+	rdev->scan_req = NULL;
+
+	if (!send_message)
+		rdev->scan_msg = msg;
+	else
+		nl80211_send_scan_msg(rdev, msg);
+}
+
+void __cfg80211_scan_done(struct work_struct *wk)
+{
+	struct cfg80211_registered_device *rdev;
+
+	rdev = container_of(wk, struct cfg80211_registered_device,
+			    scan_done_wk);
+
+	rtnl_lock();
+	___cfg80211_scan_done(rdev, true);
+	rtnl_unlock();
+}
+
+void cfg80211_scan_done(struct cfg80211_scan_request *request,
+			struct cfg80211_scan_info *info)
+{
+	struct cfg80211_scan_info old_info = request->info;
+
+	trace_cfg80211_scan_done(request, info);
+	WARN_ON(request != wiphy_to_rdev(request->wiphy)->scan_req &&
+		request != wiphy_to_rdev(request->wiphy)->int_scan_req);
+
+	request->info = *info;
+
+	/*
+	 * In case the scan is split, the scan_start_tsf and tsf_bssid should
+	 * be of the first part. In such a case old_info.scan_start_tsf should
+	 * be non zero.
+	 */
+	if (request->scan_6ghz && old_info.scan_start_tsf) {
+		request->info.scan_start_tsf = old_info.scan_start_tsf;
+		memcpy(request->info.tsf_bssid, old_info.tsf_bssid,
+		       sizeof(request->info.tsf_bssid));
+	}
+
+	request->notified = true;
+	queue_work(cfg80211_wq, &wiphy_to_rdev(request->wiphy)->scan_done_wk);
+}
+EXPORT_SYMBOL(cfg80211_scan_done);
+
+void cfg80211_add_sched_scan_req(struct cfg80211_registered_device *rdev,
+				 struct cfg80211_sched_scan_request *req)
+{
+	ASSERT_RTNL();
+
+	list_add_rcu(&req->list, &rdev->sched_scan_req_list);
+}
+
+static void cfg80211_del_sched_scan_req(struct cfg80211_registered_device *rdev,
+					struct cfg80211_sched_scan_request *req)
+{
+	ASSERT_RTNL();
+
+	list_del_rcu(&req->list);
+	kfree_rcu(req, rcu_head);
+}
+
+static struct cfg80211_sched_scan_request *
+cfg80211_find_sched_scan_req(struct cfg80211_registered_device *rdev, u64 reqid)
+{
+	struct cfg80211_sched_scan_request *pos;
+
+	list_for_each_entry_rcu(pos, &rdev->sched_scan_req_list, list,
+				lockdep_rtnl_is_held()) {
+		if (pos->reqid == reqid)
+			return pos;
+	}
+	return NULL;
+}
+
+/*
+ * Determines if a scheduled scan request can be handled. When a legacy
+ * scheduled scan is running no other scheduled scan is allowed regardless
+ * whether the request is for legacy or multi-support scan. When a multi-support
+ * scheduled scan is running a request for legacy scan is not allowed. In this
+ * case a request for multi-support scan can be handled if resources are
+ * available, ie. struct wiphy::max_sched_scan_reqs limit is not yet reached.
+ */
+int cfg80211_sched_scan_req_possible(struct cfg80211_registered_device *rdev,
+				     bool want_multi)
+{
+	struct cfg80211_sched_scan_request *pos;
+	int i = 0;
+
+	list_for_each_entry(pos, &rdev->sched_scan_req_list, list) {
+		/* request id zero means legacy in progress */
+		if (!i && !pos->reqid)
+			return -EINPROGRESS;
+		i++;
+	}
+
+	if (i) {
+		/* no legacy allowed when multi request(s) are active */
+		if (!want_multi)
+			return -EINPROGRESS;
+
+		/* resource limit reached */
+		if (i == rdev->wiphy.max_sched_scan_reqs)
+			return -ENOSPC;
+	}
+	return 0;
+}
+
+void cfg80211_sched_scan_results_wk(struct work_struct *work)
+{
+	struct cfg80211_registered_device *rdev;
+	struct cfg80211_sched_scan_request *req, *tmp;
+
+	rdev = container_of(work, struct cfg80211_registered_device,
+			   sched_scan_res_wk);
+
+	rtnl_lock();
+	list_for_each_entry_safe(req, tmp, &rdev->sched_scan_req_list, list) {
+		if (req->report_results) {
+			req->report_results = false;
+			if (req->flags & NL80211_SCAN_FLAG_FLUSH) {
+				/* flush entries from previous scans */
+				spin_lock_bh(&rdev->bss_lock);
+				__cfg80211_bss_expire(rdev, req->scan_start);
+				spin_unlock_bh(&rdev->bss_lock);
+				req->scan_start = jiffies;
+			}
+			nl80211_send_sched_scan(req,
+						NL80211_CMD_SCHED_SCAN_RESULTS);
+		}
+	}
+	rtnl_unlock();
+}
+
+void cfg80211_sched_scan_results(struct wiphy *wiphy, u64 reqid)
+{
+	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+	struct cfg80211_sched_scan_request *request;
+
+	trace_cfg80211_sched_scan_results(wiphy, reqid);
+	/* ignore if we're not scanning */
+
+	rcu_read_lock();
+	request = cfg80211_find_sched_scan_req(rdev, reqid);
+	if (request) {
+		request->report_results = true;
+		queue_work(cfg80211_wq, &rdev->sched_scan_res_wk);
+	}
+	rcu_read_unlock();
+}
+EXPORT_SYMBOL(cfg80211_sched_scan_results);
+
+void cfg80211_sched_scan_stopped_rtnl(struct wiphy *wiphy, u64 reqid)
+{
+	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+
+	ASSERT_RTNL();
+
+	trace_cfg80211_sched_scan_stopped(wiphy, reqid);
+
+	__cfg80211_stop_sched_scan(rdev, reqid, true);
+}
+EXPORT_SYMBOL(cfg80211_sched_scan_stopped_rtnl);
+
+void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid)
+{
+	rtnl_lock();
+	cfg80211_sched_scan_stopped_rtnl(wiphy, reqid);
+	rtnl_unlock();
+}
+EXPORT_SYMBOL(cfg80211_sched_scan_stopped);
+
+int cfg80211_stop_sched_scan_req(struct cfg80211_registered_device *rdev,
+				 struct cfg80211_sched_scan_request *req,
+				 bool driver_initiated)
+{
+	ASSERT_RTNL();
+
+	if (!driver_initiated) {
+		int err = rdev_sched_scan_stop(rdev, req->dev, req->reqid);
+		if (err)
+			return err;
+	}
+
+	nl80211_send_sched_scan(req, NL80211_CMD_SCHED_SCAN_STOPPED);
+
+	cfg80211_del_sched_scan_req(rdev, req);
+
+	return 0;
+}
+
+int __cfg80211_stop_sched_scan(struct cfg80211_registered_device *rdev,
+			       u64 reqid, bool driver_initiated)
+{
+	struct cfg80211_sched_scan_request *sched_scan_req;
+
+	ASSERT_RTNL();
+
+	sched_scan_req = cfg80211_find_sched_scan_req(rdev, reqid);
+	if (!sched_scan_req)
+		return -ENOENT;
+
+	return cfg80211_stop_sched_scan_req(rdev, sched_scan_req,
+					    driver_initiated);
+}
+
+void cfg80211_bss_age(struct cfg80211_registered_device *rdev,
+                      unsigned long age_secs)
+{
+	struct cfg80211_internal_bss *bss;
+	unsigned long age_jiffies = msecs_to_jiffies(age_secs * MSEC_PER_SEC);
+
+	spin_lock_bh(&rdev->bss_lock);
+	list_for_each_entry(bss, &rdev->bss_list, list)
+		bss->ts -= age_jiffies;
+	spin_unlock_bh(&rdev->bss_lock);
+}
+
+void cfg80211_bss_expire(struct cfg80211_registered_device *rdev)
+{
+	__cfg80211_bss_expire(rdev, jiffies - IEEE80211_SCAN_RESULT_EXPIRE);
+}
+
+void cfg80211_bss_flush(struct wiphy *wiphy)
+{
+	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+
+	spin_lock_bh(&rdev->bss_lock);
+	__cfg80211_bss_expire(rdev, jiffies);
+	spin_unlock_bh(&rdev->bss_lock);
+}
+EXPORT_SYMBOL(cfg80211_bss_flush);
+
+const struct element *
+cfg80211_find_elem_match(u8 eid, const u8 *ies, unsigned int len,
+			 const u8 *match, unsigned int match_len,
+			 unsigned int match_offset)
+{
+	const struct element *elem;
+
+	for_each_element_id(elem, eid, ies, len) {
+		if (elem->datalen >= match_offset + match_len &&
+		    !memcmp(elem->data + match_offset, match, match_len))
+			return elem;
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL(cfg80211_find_elem_match);
+
+const struct element *cfg80211_find_vendor_elem(unsigned int oui, int oui_type,
+						const u8 *ies,
+						unsigned int len)
+{
+	const struct element *elem;
+	u8 match[] = { oui >> 16, oui >> 8, oui, oui_type };
+	int match_len = (oui_type < 0) ? 3 : sizeof(match);
+
+	if (WARN_ON(oui_type > 0xff))
+		return NULL;
+
+	elem = cfg80211_find_elem_match(WLAN_EID_VENDOR_SPECIFIC, ies, len,
+					match, match_len, 0);
+
+	if (!elem || elem->datalen < 4)
+		return NULL;
+
+	return elem;
+}
+EXPORT_SYMBOL(cfg80211_find_vendor_elem);
+
+/**
+ * enum bss_compare_mode - BSS compare mode
+ * @BSS_CMP_REGULAR: regular compare mode (for insertion and normal find)
+ * @BSS_CMP_HIDE_ZLEN: find hidden SSID with zero-length mode
+ * @BSS_CMP_HIDE_NUL: find hidden SSID with NUL-ed out mode
+ */
+enum bss_compare_mode {
+	BSS_CMP_REGULAR,
+	BSS_CMP_HIDE_ZLEN,
+	BSS_CMP_HIDE_NUL,
+};
+
+static int cmp_bss(struct cfg80211_bss *a,
+		   struct cfg80211_bss *b,
+		   enum bss_compare_mode mode)
+{
+	const struct cfg80211_bss_ies *a_ies, *b_ies;
+	const u8 *ie1 = NULL;
+	const u8 *ie2 = NULL;
+	int i, r;
+
+	if (a->channel != b->channel)
+		return b->channel->center_freq - a->channel->center_freq;
+
+	a_ies = rcu_access_pointer(a->ies);
+	if (!a_ies)
+		return -1;
+	b_ies = rcu_access_pointer(b->ies);
+	if (!b_ies)
+		return 1;
+
+	if (WLAN_CAPABILITY_IS_STA_BSS(a->capability))
+		ie1 = cfg80211_find_ie(WLAN_EID_MESH_ID,
+				       a_ies->data, a_ies->len);
+	if (WLAN_CAPABILITY_IS_STA_BSS(b->capability))
+		ie2 = cfg80211_find_ie(WLAN_EID_MESH_ID,
+				       b_ies->data, b_ies->len);
+	if (ie1 && ie2) {
+		int mesh_id_cmp;
+
+		if (ie1[1] == ie2[1])
+			mesh_id_cmp = memcmp(ie1 + 2, ie2 + 2, ie1[1]);
+		else
+			mesh_id_cmp = ie2[1] - ie1[1];
+
+		ie1 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
+				       a_ies->data, a_ies->len);
+		ie2 = cfg80211_find_ie(WLAN_EID_MESH_CONFIG,
+				       b_ies->data, b_ies->len);
+		if (ie1 && ie2) {
+			if (mesh_id_cmp)
+				return mesh_id_cmp;
+			if (ie1[1] != ie2[1])
+				return ie2[1] - ie1[1];
+			return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
+		}
+	}
+
+	r = memcmp(a->bssid, b->bssid, sizeof(a->bssid));
+	if (r)
+		return r;
+
+	ie1 = cfg80211_find_ie(WLAN_EID_SSID, a_ies->data, a_ies->len);
+	ie2 = cfg80211_find_ie(WLAN_EID_SSID, b_ies->data, b_ies->len);
+
+	if (!ie1 && !ie2)
+		return 0;
+
+	/*
+	 * Note that with "hide_ssid", the function returns a match if
+	 * the already-present BSS ("b") is a hidden SSID beacon for
+	 * the new BSS ("a").
+	 */
+
+	/* sort missing IE before (left of) present IE */
+	if (!ie1)
+		return -1;
+	if (!ie2)
+		return 1;
+
+	switch (mode) {
+	case BSS_CMP_HIDE_ZLEN:
+		/*
+		 * In ZLEN mode we assume the BSS entry we're
+		 * looking for has a zero-length SSID. So if
+		 * the one we're looking at right now has that,
+		 * return 0. Otherwise, return the difference
+		 * in length, but since we're looking for the
+		 * 0-length it's really equivalent to returning
+		 * the length of the one we're looking at.
+		 *
+		 * No content comparison is needed as we assume
+		 * the content length is zero.
+		 */
+		return ie2[1];
+	case BSS_CMP_REGULAR:
+	default:
+		/* sort by length first, then by contents */
+		if (ie1[1] != ie2[1])
+			return ie2[1] - ie1[1];
+		return memcmp(ie1 + 2, ie2 + 2, ie1[1]);
+	case BSS_CMP_HIDE_NUL:
+		if (ie1[1] != ie2[1])
+			return ie2[1] - ie1[1];
+		/* this is equivalent to memcmp(zeroes, ie2 + 2, len) */
+		for (i = 0; i < ie2[1]; i++)
+			if (ie2[i + 2])
+				return -1;
+		return 0;
+	}
+}
+
+static bool cfg80211_bss_type_match(u16 capability,
+				    enum nl80211_band band,
+				    enum ieee80211_bss_type bss_type)
+{
+	bool ret = true;
+	u16 mask, val;
+
+	if (bss_type == IEEE80211_BSS_TYPE_ANY)
+		return ret;
+
+	if (band == NL80211_BAND_60GHZ) {
+		mask = WLAN_CAPABILITY_DMG_TYPE_MASK;
+		switch (bss_type) {
+		case IEEE80211_BSS_TYPE_ESS:
+			val = WLAN_CAPABILITY_DMG_TYPE_AP;
+			break;
+		case IEEE80211_BSS_TYPE_PBSS:
+			val = WLAN_CAPABILITY_DMG_TYPE_PBSS;
+			break;
+		case IEEE80211_BSS_TYPE_IBSS:
+			val = WLAN_CAPABILITY_DMG_TYPE_IBSS;
+			break;
+		default:
+			return false;
+		}
+	} else {
+		mask = WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS;
+		switch (bss_type) {
+		case IEEE80211_BSS_TYPE_ESS:
+			val = WLAN_CAPABILITY_ESS;
+			break;
+		case IEEE80211_BSS_TYPE_IBSS:
+			val = WLAN_CAPABILITY_IBSS;
+			break;
+		case IEEE80211_BSS_TYPE_MBSS:
+			val = 0;
+			break;
+		default:
+			return false;
+		}
+	}
+
+	ret = ((capability & mask) == val);
+	return ret;
+}
+
+/* Returned bss is reference counted and must be cleaned up appropriately. */
+struct cfg80211_bss *cfg80211_get_bss(struct wiphy *wiphy,
+				      struct ieee80211_channel *channel,
+				      const u8 *bssid,
+				      const u8 *ssid, size_t ssid_len,
+				      enum ieee80211_bss_type bss_type,
+				      enum ieee80211_privacy privacy)
+{
+	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+	struct cfg80211_internal_bss *bss, *res = NULL;
+	unsigned long now = jiffies;
+	int bss_privacy;
+
+	trace_cfg80211_get_bss(wiphy, channel, bssid, ssid, ssid_len, bss_type,
+			       privacy);
+
+	spin_lock_bh(&rdev->bss_lock);
+
+	list_for_each_entry(bss, &rdev->bss_list, list) {
+		if (!cfg80211_bss_type_match(bss->pub.capability,
+					     bss->pub.channel->band, bss_type))
+			continue;
+
+		bss_privacy = (bss->pub.capability & WLAN_CAPABILITY_PRIVACY);
+		if ((privacy == IEEE80211_PRIVACY_ON && !bss_privacy) ||
+		    (privacy == IEEE80211_PRIVACY_OFF && bss_privacy))
+			continue;
+		if (channel && bss->pub.channel != channel)
+			continue;
+		if (!is_valid_ether_addr(bss->pub.bssid))
+			continue;
+		/* Don't get expired BSS structs */
+		if (time_after(now, bss->ts + IEEE80211_SCAN_RESULT_EXPIRE) &&
+		    !atomic_read(&bss->hold))
+			continue;
+		if (is_bss(&bss->pub, bssid, ssid, ssid_len)) {
+			res = bss;
+			bss_ref_get(rdev, res);
+			break;
+		}
+	}
+
+	spin_unlock_bh(&rdev->bss_lock);
+	if (!res)
+		return NULL;
+	trace_cfg80211_return_bss(&res->pub);
+	return &res->pub;
+}
+EXPORT_SYMBOL(cfg80211_get_bss);
+
+static void rb_insert_bss(struct cfg80211_registered_device *rdev,
+			  struct cfg80211_internal_bss *bss)
+{
+	struct rb_node **p = &rdev->bss_tree.rb_node;
+	struct rb_node *parent = NULL;
+	struct cfg80211_internal_bss *tbss;
+	int cmp;
+
+	while (*p) {
+		parent = *p;
+		tbss = rb_entry(parent, struct cfg80211_internal_bss, rbn);
+
+		cmp = cmp_bss(&bss->pub, &tbss->pub, BSS_CMP_REGULAR);
+
+		if (WARN_ON(!cmp)) {
+			/* will sort of leak this BSS */
+			return;
+		}
+
+		if (cmp < 0)
+			p = &(*p)->rb_left;
+		else
+			p = &(*p)->rb_right;
+	}
+
+	rb_link_node(&bss->rbn, parent, p);
+	rb_insert_color(&bss->rbn, &rdev->bss_tree);
+}
+
+static struct cfg80211_internal_bss *
+rb_find_bss(struct cfg80211_registered_device *rdev,
+	    struct cfg80211_internal_bss *res,
+	    enum bss_compare_mode mode)
+{
+	struct rb_node *n = rdev->bss_tree.rb_node;
+	struct cfg80211_internal_bss *bss;
+	int r;
+
+	while (n) {
+		bss = rb_entry(n, struct cfg80211_internal_bss, rbn);
+		r = cmp_bss(&res->pub, &bss->pub, mode);
+
+		if (r == 0)
+			return bss;
+		else if (r < 0)
+			n = n->rb_left;
+		else
+			n = n->rb_right;
+	}
+
+	return NULL;
+}
+
+static bool cfg80211_combine_bsses(struct cfg80211_registered_device *rdev,
+				   struct cfg80211_internal_bss *new)
+{
+	const struct cfg80211_bss_ies *ies;
+	struct cfg80211_internal_bss *bss;
+	const u8 *ie;
+	int i, ssidlen;
+	u8 fold = 0;
+	u32 n_entries = 0;
+
+	ies = rcu_access_pointer(new->pub.beacon_ies);
+	if (WARN_ON(!ies))
+		return false;
+
+	ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
+	if (!ie) {
+		/* nothing to do */
+		return true;
+	}
+
+	ssidlen = ie[1];
+	for (i = 0; i < ssidlen; i++)
+		fold |= ie[2 + i];
+
+	if (fold) {
+		/* not a hidden SSID */
+		return true;
+	}
+
+	/* This is the bad part ... */
+
+	list_for_each_entry(bss, &rdev->bss_list, list) {
+		/*
+		 * we're iterating all the entries anyway, so take the
+		 * opportunity to validate the list length accounting
+		 */
+		n_entries++;
+
+		if (!ether_addr_equal(bss->pub.bssid, new->pub.bssid))
+			continue;
+		if (bss->pub.channel != new->pub.channel)
+			continue;
+		if (bss->pub.scan_width != new->pub.scan_width)
+			continue;
+		if (rcu_access_pointer(bss->pub.beacon_ies))
+			continue;
+		ies = rcu_access_pointer(bss->pub.ies);
+		if (!ies)
+			continue;
+		ie = cfg80211_find_ie(WLAN_EID_SSID, ies->data, ies->len);
+		if (!ie)
+			continue;
+		if (ssidlen && ie[1] != ssidlen)
+			continue;
+		if (WARN_ON_ONCE(bss->pub.hidden_beacon_bss))
+			continue;
+		if (WARN_ON_ONCE(!list_empty(&bss->hidden_list)))
+			list_del(&bss->hidden_list);
+		/* combine them */
+		list_add(&bss->hidden_list, &new->hidden_list);
+		bss->pub.hidden_beacon_bss = &new->pub;
+		new->refcount += bss->refcount;
+		rcu_assign_pointer(bss->pub.beacon_ies,
+				   new->pub.beacon_ies);
+	}
+
+	WARN_ONCE(n_entries != rdev->bss_entries,
+		  "rdev bss entries[%d]/list[len:%d] corruption\n",
+		  rdev->bss_entries, n_entries);
+
+	return true;
+}
+
+struct cfg80211_non_tx_bss {
+	struct cfg80211_bss *tx_bss;
+	u8 max_bssid_indicator;
+	u8 bssid_index;
+};
+
+static void cfg80211_update_hidden_bsses(struct cfg80211_internal_bss *known,
+					 const struct cfg80211_bss_ies *new_ies,
+					 const struct cfg80211_bss_ies *old_ies)
+{
+	struct cfg80211_internal_bss *bss;
+
+	/* Assign beacon IEs to all sub entries */
+	list_for_each_entry(bss, &known->hidden_list, hidden_list) {
+		const struct cfg80211_bss_ies *ies;
+
+		ies = rcu_access_pointer(bss->pub.beacon_ies);
+		WARN_ON(ies != old_ies);
+
+		rcu_assign_pointer(bss->pub.beacon_ies, new_ies);
+	}
+}
+
+static bool
+cfg80211_update_known_bss(struct cfg80211_registered_device *rdev,
+			  struct cfg80211_internal_bss *known,
+			  struct cfg80211_internal_bss *new,
+			  bool signal_valid)
+{
+	lockdep_assert_held(&rdev->bss_lock);
+
+	/* Update IEs */
+	if (rcu_access_pointer(new->pub.proberesp_ies)) {
+		const struct cfg80211_bss_ies *old;
+
+		old = rcu_access_pointer(known->pub.proberesp_ies);
+
+		rcu_assign_pointer(known->pub.proberesp_ies,
+				   new->pub.proberesp_ies);
+		/* Override possible earlier Beacon frame IEs */
+		rcu_assign_pointer(known->pub.ies,
+				   new->pub.proberesp_ies);
+		if (old)
+			kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
+	} else if (rcu_access_pointer(new->pub.beacon_ies)) {
+		const struct cfg80211_bss_ies *old;
+
+		if (known->pub.hidden_beacon_bss &&
+		    !list_empty(&known->hidden_list)) {
+			const struct cfg80211_bss_ies *f;
+
+			/* The known BSS struct is one of the probe
+			 * response members of a group, but we're
+			 * receiving a beacon (beacon_ies in the new
+			 * bss is used). This can only mean that the
+			 * AP changed its beacon from not having an
+			 * SSID to showing it, which is confusing so
+			 * drop this information.
+			 */
+
+			f = rcu_access_pointer(new->pub.beacon_ies);
+			kfree_rcu((struct cfg80211_bss_ies *)f, rcu_head);
+			return false;
+		}
+
+		old = rcu_access_pointer(known->pub.beacon_ies);
+
+		rcu_assign_pointer(known->pub.beacon_ies, new->pub.beacon_ies);
+
+		/* Override IEs if they were from a beacon before */
+		if (old == rcu_access_pointer(known->pub.ies))
+			rcu_assign_pointer(known->pub.ies, new->pub.beacon_ies);
+
+		cfg80211_update_hidden_bsses(known,
+					     rcu_access_pointer(new->pub.beacon_ies),
+					     old);
+
+		if (old)
+			kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
+	}
+
+	known->pub.beacon_interval = new->pub.beacon_interval;
+
+	/* don't update the signal if beacon was heard on
+	 * adjacent channel.
+	 */
+	if (signal_valid)
+		known->pub.signal = new->pub.signal;
+	known->pub.capability = new->pub.capability;
+	known->ts = new->ts;
+	known->ts_boottime = new->ts_boottime;
+	known->parent_tsf = new->parent_tsf;
+	known->pub.chains = new->pub.chains;
+	memcpy(known->pub.chain_signal, new->pub.chain_signal,
+	       IEEE80211_MAX_CHAINS);
+	ether_addr_copy(known->parent_bssid, new->parent_bssid);
+	known->pub.max_bssid_indicator = new->pub.max_bssid_indicator;
+	known->pub.bssid_index = new->pub.bssid_index;
+
+	return true;
+}
+
+/* Returned bss is reference counted and must be cleaned up appropriately. */
+struct cfg80211_internal_bss *
+cfg80211_bss_update(struct cfg80211_registered_device *rdev,
+		    struct cfg80211_internal_bss *tmp,
+		    bool signal_valid, unsigned long ts)
+{
+	struct cfg80211_internal_bss *found = NULL;
+
+	if (WARN_ON(!tmp->pub.channel))
+		return NULL;
+
+	tmp->ts = ts;
+
+	spin_lock_bh(&rdev->bss_lock);
+
+	if (WARN_ON(!rcu_access_pointer(tmp->pub.ies))) {
+		spin_unlock_bh(&rdev->bss_lock);
+		return NULL;
+	}
+
+	found = rb_find_bss(rdev, tmp, BSS_CMP_REGULAR);
+
+	if (found) {
+		if (!cfg80211_update_known_bss(rdev, found, tmp, signal_valid))
+			goto drop;
+	} else {
+		struct cfg80211_internal_bss *new;
+		struct cfg80211_internal_bss *hidden;
+		struct cfg80211_bss_ies *ies;
+
+		/*
+		 * create a copy -- the "res" variable that is passed in
+		 * is allocated on the stack since it's not needed in the
+		 * more common case of an update
+		 */
+		new = kzalloc(sizeof(*new) + rdev->wiphy.bss_priv_size,
+			      GFP_ATOMIC);
+		if (!new) {
+			ies = (void *)rcu_dereference(tmp->pub.beacon_ies);
+			if (ies)
+				kfree_rcu(ies, rcu_head);
+			ies = (void *)rcu_dereference(tmp->pub.proberesp_ies);
+			if (ies)
+				kfree_rcu(ies, rcu_head);
+			goto drop;
+		}
+		memcpy(new, tmp, sizeof(*new));
+		new->refcount = 1;
+		INIT_LIST_HEAD(&new->hidden_list);
+		INIT_LIST_HEAD(&new->pub.nontrans_list);
+		/* we'll set this later if it was non-NULL */
+		new->pub.transmitted_bss = NULL;
+
+		if (rcu_access_pointer(tmp->pub.proberesp_ies)) {
+			hidden = rb_find_bss(rdev, tmp, BSS_CMP_HIDE_ZLEN);
+			if (!hidden)
+				hidden = rb_find_bss(rdev, tmp,
+						     BSS_CMP_HIDE_NUL);
+			if (hidden) {
+				new->pub.hidden_beacon_bss = &hidden->pub;
+				list_add(&new->hidden_list,
+					 &hidden->hidden_list);
+				hidden->refcount++;
+				rcu_assign_pointer(new->pub.beacon_ies,
+						   hidden->pub.beacon_ies);
+			}
+		} else {
+			/*
+			 * Ok so we found a beacon, and don't have an entry. If
+			 * it's a beacon with hidden SSID, we might be in for an
+			 * expensive search for any probe responses that should
+			 * be grouped with this beacon for updates ...
+			 */
+			if (!cfg80211_combine_bsses(rdev, new)) {
+				bss_ref_put(rdev, new);
+				goto drop;
+			}
+		}
+
+		if (rdev->bss_entries >= bss_entries_limit &&
+		    !cfg80211_bss_expire_oldest(rdev)) {
+			bss_ref_put(rdev, new);
+			goto drop;
+		}
+
+		/* This must be before the call to bss_ref_get */
+		if (tmp->pub.transmitted_bss) {
+			struct cfg80211_internal_bss *pbss =
+				container_of(tmp->pub.transmitted_bss,
+					     struct cfg80211_internal_bss,
+					     pub);
+
+			new->pub.transmitted_bss = tmp->pub.transmitted_bss;
+			bss_ref_get(rdev, pbss);
+		}
+
+		list_add_tail(&new->list, &rdev->bss_list);
+		rdev->bss_entries++;
+		rb_insert_bss(rdev, new);
+		found = new;
+	}
+
+	rdev->bss_generation++;
+	bss_ref_get(rdev, found);
+	spin_unlock_bh(&rdev->bss_lock);
+
+	return found;
+ drop:
+	spin_unlock_bh(&rdev->bss_lock);
+	return NULL;
+}
+
+/*
+ * Update RX channel information based on the available frame payload
+ * information. This is mainly for the 2.4 GHz band where frames can be received
+ * from neighboring channels and the Beacon frames use the DSSS Parameter Set
+ * element to indicate the current (transmitting) channel, but this might also
+ * be needed on other bands if RX frequency does not match with the actual
+ * operating channel of a BSS.
+ */
+static struct ieee80211_channel *
+cfg80211_get_bss_channel(struct wiphy *wiphy, const u8 *ie, size_t ielen,
+			 struct ieee80211_channel *channel,
+			 enum nl80211_bss_scan_width scan_width)
+{
+	const u8 *tmp;
+	u32 freq;
+	int channel_number = -1;
+	struct ieee80211_channel *alt_channel;
+
+	if (channel->band == NL80211_BAND_S1GHZ) {
+		tmp = cfg80211_find_ie(WLAN_EID_S1G_OPERATION, ie, ielen);
+		if (tmp && tmp[1] >= sizeof(struct ieee80211_s1g_oper_ie)) {
+			struct ieee80211_s1g_oper_ie *s1gop = (void *)(tmp + 2);
+
+			channel_number = s1gop->primary_ch;
+		}
+	} else {
+		tmp = cfg80211_find_ie(WLAN_EID_DS_PARAMS, ie, ielen);
+		if (tmp && tmp[1] == 1) {
+			channel_number = tmp[2];
+		} else {
+			tmp = cfg80211_find_ie(WLAN_EID_HT_OPERATION, ie, ielen);
+			if (tmp && tmp[1] >= sizeof(struct ieee80211_ht_operation)) {
+				struct ieee80211_ht_operation *htop = (void *)(tmp + 2);
+
+				channel_number = htop->primary_chan;
+			}
+		}
+	}
+
+	if (channel_number < 0) {
+		/* No channel information in frame payload */
+		return channel;
+	}
+
+	freq = ieee80211_channel_to_freq_khz(channel_number, channel->band);
+	alt_channel = ieee80211_get_channel_khz(wiphy, freq);
+	if (!alt_channel) {
+		if (channel->band == NL80211_BAND_2GHZ) {
+			/*
+			 * Better not allow unexpected channels when that could
+			 * be going beyond the 1-11 range (e.g., discovering
+			 * BSS on channel 12 when radio is configured for
+			 * channel 11.
+			 */
+			return NULL;
+		}
+
+		/* No match for the payload channel number - ignore it */
+		return channel;
+	}
+
+	if (scan_width == NL80211_BSS_CHAN_WIDTH_10 ||
+	    scan_width == NL80211_BSS_CHAN_WIDTH_5) {
+		/*
+		 * Ignore channel number in 5 and 10 MHz channels where there
+		 * may not be an n:1 or 1:n mapping between frequencies and
+		 * channel numbers.
+		 */
+		return channel;
+	}
+
+	/*
+	 * Use the channel determined through the payload channel number
+	 * instead of the RX channel reported by the driver.
+	 */
+	if (alt_channel->flags & IEEE80211_CHAN_DISABLED)
+		return NULL;
+	return alt_channel;
+}
+
+/* Returned bss is reference counted and must be cleaned up appropriately. */
+static struct cfg80211_bss *
+cfg80211_inform_single_bss_data(struct wiphy *wiphy,
+				struct cfg80211_inform_bss *data,
+				enum cfg80211_bss_frame_type ftype,
+				const u8 *bssid, u64 tsf, u16 capability,
+				u16 beacon_interval, const u8 *ie, size_t ielen,
+				struct cfg80211_non_tx_bss *non_tx_data,
+				gfp_t gfp)
+{
+	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+	struct cfg80211_bss_ies *ies;
+	struct ieee80211_channel *channel;
+	struct cfg80211_internal_bss tmp = {}, *res;
+	int bss_type;
+	bool signal_valid;
+	unsigned long ts;
+
+	if (WARN_ON(!wiphy))
+		return NULL;
+
+	if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
+		    (data->signal < 0 || data->signal > 100)))
+		return NULL;
+
+	channel = cfg80211_get_bss_channel(wiphy, ie, ielen, data->chan,
+					   data->scan_width);
+	if (!channel)
+		return NULL;
+
+	memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
+	tmp.pub.channel = channel;
+	tmp.pub.scan_width = data->scan_width;
+	tmp.pub.signal = data->signal;
+	tmp.pub.beacon_interval = beacon_interval;
+	tmp.pub.capability = capability;
+	tmp.ts_boottime = data->boottime_ns;
+	if (non_tx_data) {
+		tmp.pub.transmitted_bss = non_tx_data->tx_bss;
+		ts = bss_from_pub(non_tx_data->tx_bss)->ts;
+		tmp.pub.bssid_index = non_tx_data->bssid_index;
+		tmp.pub.max_bssid_indicator = non_tx_data->max_bssid_indicator;
+	} else {
+		ts = jiffies;
+	}
+
+	/*
+	 * If we do not know here whether the IEs are from a Beacon or Probe
+	 * Response frame, we need to pick one of the options and only use it
+	 * with the driver that does not provide the full Beacon/Probe Response
+	 * frame. Use Beacon frame pointer to avoid indicating that this should
+	 * override the IEs pointer should we have received an earlier
+	 * indication of Probe Response data.
+	 */
+	ies = kzalloc(sizeof(*ies) + ielen, gfp);
+	if (!ies)
+		return NULL;
+	ies->len = ielen;
+	ies->tsf = tsf;
+	ies->from_beacon = false;
+	memcpy(ies->data, ie, ielen);
+
+	switch (ftype) {
+	case CFG80211_BSS_FTYPE_BEACON:
+		ies->from_beacon = true;
+		fallthrough;
+	case CFG80211_BSS_FTYPE_UNKNOWN:
+		rcu_assign_pointer(tmp.pub.beacon_ies, ies);
+		break;
+	case CFG80211_BSS_FTYPE_PRESP:
+		rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
+		break;
+	}
+	rcu_assign_pointer(tmp.pub.ies, ies);
+
+	signal_valid = data->chan == channel;
+	res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid, ts);
+	if (!res)
+		return NULL;
+
+	if (channel->band == NL80211_BAND_60GHZ) {
+		bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
+		if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
+		    bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
+			regulatory_hint_found_beacon(wiphy, channel, gfp);
+	} else {
+		if (res->pub.capability & WLAN_CAPABILITY_ESS)
+			regulatory_hint_found_beacon(wiphy, channel, gfp);
+	}
+
+	if (non_tx_data) {
+		/* this is a nontransmitting bss, we need to add it to
+		 * transmitting bss' list if it is not there
+		 */
+		spin_lock_bh(&rdev->bss_lock);
+		if (cfg80211_add_nontrans_list(non_tx_data->tx_bss,
+					       &res->pub)) {
+			if (__cfg80211_unlink_bss(rdev, res)) {
+				rdev->bss_generation++;
+				res = NULL;
+			}
+		}
+		spin_unlock_bh(&rdev->bss_lock);
+
+		if (!res)
+			return NULL;
+	}
+
+	trace_cfg80211_return_bss(&res->pub);
+	/* cfg80211_bss_update gives us a referenced result */
+	return &res->pub;
+}
+
+static const struct element
+*cfg80211_get_profile_continuation(const u8 *ie, size_t ielen,
+				   const struct element *mbssid_elem,
+				   const struct element *sub_elem)
+{
+	const u8 *mbssid_end = mbssid_elem->data + mbssid_elem->datalen;
+	const struct element *next_mbssid;
+	const struct element *next_sub;
+
+	next_mbssid = cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID,
+					 mbssid_end,
+					 ielen - (mbssid_end - ie));
+
+	/*
+	 * If it is not the last subelement in current MBSSID IE or there isn't
+	 * a next MBSSID IE - profile is complete.
+	*/
+	if ((sub_elem->data + sub_elem->datalen < mbssid_end - 1) ||
+	    !next_mbssid)
+		return NULL;
+
+	/* For any length error, just return NULL */
+
+	if (next_mbssid->datalen < 4)
+		return NULL;
+
+	next_sub = (void *)&next_mbssid->data[1];
+
+	if (next_mbssid->data + next_mbssid->datalen <
+	    next_sub->data + next_sub->datalen)
+		return NULL;
+
+	if (next_sub->id != 0 || next_sub->datalen < 2)
+		return NULL;
+
+	/*
+	 * Check if the first element in the next sub element is a start
+	 * of a new profile
+	 */
+	return next_sub->data[0] == WLAN_EID_NON_TX_BSSID_CAP ?
+	       NULL : next_mbssid;
+}
+
+size_t cfg80211_merge_profile(const u8 *ie, size_t ielen,
+			      const struct element *mbssid_elem,
+			      const struct element *sub_elem,
+			      u8 *merged_ie, size_t max_copy_len)
+{
+	size_t copied_len = sub_elem->datalen;
+	const struct element *next_mbssid;
+
+	if (sub_elem->datalen > max_copy_len)
+		return 0;
+
+	memcpy(merged_ie, sub_elem->data, sub_elem->datalen);
+
+	while ((next_mbssid = cfg80211_get_profile_continuation(ie, ielen,
+								mbssid_elem,
+								sub_elem))) {
+		const struct element *next_sub = (void *)&next_mbssid->data[1];
+
+		if (copied_len + next_sub->datalen > max_copy_len)
+			break;
+		memcpy(merged_ie + copied_len, next_sub->data,
+		       next_sub->datalen);
+		copied_len += next_sub->datalen;
+	}
+
+	return copied_len;
+}
+EXPORT_SYMBOL(cfg80211_merge_profile);
+
+static void cfg80211_parse_mbssid_data(struct wiphy *wiphy,
+				       struct cfg80211_inform_bss *data,
+				       enum cfg80211_bss_frame_type ftype,
+				       const u8 *bssid, u64 tsf,
+				       u16 beacon_interval, const u8 *ie,
+				       size_t ielen,
+				       struct cfg80211_non_tx_bss *non_tx_data,
+				       gfp_t gfp)
+{
+	const u8 *mbssid_index_ie;
+	const struct element *elem, *sub;
+	size_t new_ie_len;
+	u8 new_bssid[ETH_ALEN];
+	u8 *new_ie, *profile;
+	u64 seen_indices = 0;
+	u16 capability;
+	struct cfg80211_bss *bss;
+
+	if (!non_tx_data)
+		return;
+	if (!cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
+		return;
+	if (!wiphy->support_mbssid)
+		return;
+	if (wiphy->support_only_he_mbssid &&
+	    !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
+		return;
+
+	new_ie = kmalloc(IEEE80211_MAX_DATA_LEN, gfp);
+	if (!new_ie)
+		return;
+
+	profile = kmalloc(ielen, gfp);
+	if (!profile)
+		goto out;
+
+	for_each_element_id(elem, WLAN_EID_MULTIPLE_BSSID, ie, ielen) {
+		if (elem->datalen < 4)
+			continue;
+		if (elem->data[0] < 1 || (int)elem->data[0] > 8)
+			continue;
+		for_each_element(sub, elem->data + 1, elem->datalen - 1) {
+			u8 profile_len;
+
+			if (sub->id != 0 || sub->datalen < 4) {
+				/* not a valid BSS profile */
+				continue;
+			}
+
+			if (sub->data[0] != WLAN_EID_NON_TX_BSSID_CAP ||
+			    sub->data[1] != 2) {
+				/* The first element within the Nontransmitted
+				 * BSSID Profile is not the Nontransmitted
+				 * BSSID Capability element.
+				 */
+				continue;
+			}
+
+			memset(profile, 0, ielen);
+			profile_len = cfg80211_merge_profile(ie, ielen,
+							     elem,
+							     sub,
+							     profile,
+							     ielen);
+
+			/* found a Nontransmitted BSSID Profile */
+			mbssid_index_ie = cfg80211_find_ie
+				(WLAN_EID_MULTI_BSSID_IDX,
+				 profile, profile_len);
+			if (!mbssid_index_ie || mbssid_index_ie[1] < 1 ||
+			    mbssid_index_ie[2] == 0 ||
+			    mbssid_index_ie[2] > 46) {
+				/* No valid Multiple BSSID-Index element */
+				continue;
+			}
+
+			if (seen_indices & BIT_ULL(mbssid_index_ie[2]))
+				/* We don't support legacy split of a profile */
+				net_dbg_ratelimited("Partial info for BSSID index %d\n",
+						    mbssid_index_ie[2]);
+
+			seen_indices |= BIT_ULL(mbssid_index_ie[2]);
+
+			non_tx_data->bssid_index = mbssid_index_ie[2];
+			non_tx_data->max_bssid_indicator = elem->data[0];
+
+			cfg80211_gen_new_bssid(bssid,
+					       non_tx_data->max_bssid_indicator,
+					       non_tx_data->bssid_index,
+					       new_bssid);
+			memset(new_ie, 0, IEEE80211_MAX_DATA_LEN);
+			new_ie_len = cfg80211_gen_new_ie(ie, ielen,
+							 profile,
+							 profile_len, new_ie,
+							 IEEE80211_MAX_DATA_LEN);
+			if (!new_ie_len)
+				continue;
+
+			capability = get_unaligned_le16(profile + 2);
+			bss = cfg80211_inform_single_bss_data(wiphy, data,
+							      ftype,
+							      new_bssid, tsf,
+							      capability,
+							      beacon_interval,
+							      new_ie,
+							      new_ie_len,
+							      non_tx_data,
+							      gfp);
+			if (!bss)
+				break;
+			cfg80211_put_bss(wiphy, bss);
+		}
+	}
+
+out:
+	kfree(new_ie);
+	kfree(profile);
+}
+
+struct cfg80211_bss *
+cfg80211_inform_bss_data(struct wiphy *wiphy,
+			 struct cfg80211_inform_bss *data,
+			 enum cfg80211_bss_frame_type ftype,
+			 const u8 *bssid, u64 tsf, u16 capability,
+			 u16 beacon_interval, const u8 *ie, size_t ielen,
+			 gfp_t gfp)
+{
+	struct cfg80211_bss *res;
+	struct cfg80211_non_tx_bss non_tx_data;
+
+	res = cfg80211_inform_single_bss_data(wiphy, data, ftype, bssid, tsf,
+					      capability, beacon_interval, ie,
+					      ielen, NULL, gfp);
+	if (!res)
+		return NULL;
+	non_tx_data.tx_bss = res;
+	cfg80211_parse_mbssid_data(wiphy, data, ftype, bssid, tsf,
+				   beacon_interval, ie, ielen, &non_tx_data,
+				   gfp);
+	return res;
+}
+EXPORT_SYMBOL(cfg80211_inform_bss_data);
+
+static void
+cfg80211_parse_mbssid_frame_data(struct wiphy *wiphy,
+				 struct cfg80211_inform_bss *data,
+				 struct ieee80211_mgmt *mgmt, size_t len,
+				 struct cfg80211_non_tx_bss *non_tx_data,
+				 gfp_t gfp)
+{
+	enum cfg80211_bss_frame_type ftype;
+	const u8 *ie = mgmt->u.probe_resp.variable;
+	size_t ielen = len - offsetof(struct ieee80211_mgmt,
+				      u.probe_resp.variable);
+
+	ftype = ieee80211_is_beacon(mgmt->frame_control) ?
+		CFG80211_BSS_FTYPE_BEACON : CFG80211_BSS_FTYPE_PRESP;
+
+	cfg80211_parse_mbssid_data(wiphy, data, ftype, mgmt->bssid,
+				   le64_to_cpu(mgmt->u.probe_resp.timestamp),
+				   le16_to_cpu(mgmt->u.probe_resp.beacon_int),
+				   ie, ielen, non_tx_data, gfp);
+}
+
+static void
+cfg80211_update_notlisted_nontrans(struct wiphy *wiphy,
+				   struct cfg80211_bss *nontrans_bss,
+				   struct ieee80211_mgmt *mgmt, size_t len)
+{
+	u8 *ie, *new_ie, *pos;
+	const u8 *nontrans_ssid, *trans_ssid, *mbssid;
+	size_t ielen = len - offsetof(struct ieee80211_mgmt,
+				      u.probe_resp.variable);
+	size_t new_ie_len;
+	struct cfg80211_bss_ies *new_ies;
+	const struct cfg80211_bss_ies *old;
+	size_t cpy_len;
+
+	lockdep_assert_held(&wiphy_to_rdev(wiphy)->bss_lock);
+
+	ie = mgmt->u.probe_resp.variable;
+
+	new_ie_len = ielen;
+	trans_ssid = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
+	if (!trans_ssid)
+		return;
+	new_ie_len -= trans_ssid[1];
+	mbssid = cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen);
+	/*
+	 * It's not valid to have the MBSSID element before SSID
+	 * ignore if that happens - the code below assumes it is
+	 * after (while copying things inbetween).
+	 */
+	if (!mbssid || mbssid < trans_ssid)
+		return;
+	new_ie_len -= mbssid[1];
+
+	nontrans_ssid = ieee80211_bss_get_ie(nontrans_bss, WLAN_EID_SSID);
+	if (!nontrans_ssid)
+		return;
+
+	new_ie_len += nontrans_ssid[1];
+
+	/* generate new ie for nontrans BSS
+	 * 1. replace SSID with nontrans BSS' SSID
+	 * 2. skip MBSSID IE
+	 */
+	new_ie = kzalloc(new_ie_len, GFP_ATOMIC);
+	if (!new_ie)
+		return;
+
+	new_ies = kzalloc(sizeof(*new_ies) + new_ie_len, GFP_ATOMIC);
+	if (!new_ies)
+		goto out_free;
+
+	pos = new_ie;
+
+	/* copy the nontransmitted SSID */
+	cpy_len = nontrans_ssid[1] + 2;
+	memcpy(pos, nontrans_ssid, cpy_len);
+	pos += cpy_len;
+	/* copy the IEs between SSID and MBSSID */
+	cpy_len = trans_ssid[1] + 2;
+	memcpy(pos, (trans_ssid + cpy_len), (mbssid - (trans_ssid + cpy_len)));
+	pos += (mbssid - (trans_ssid + cpy_len));
+	/* copy the IEs after MBSSID */
+	cpy_len = mbssid[1] + 2;
+	memcpy(pos, mbssid + cpy_len, ((ie + ielen) - (mbssid + cpy_len)));
+
+	/* update ie */
+	new_ies->len = new_ie_len;
+	new_ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
+	new_ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control);
+	memcpy(new_ies->data, new_ie, new_ie_len);
+	if (ieee80211_is_probe_resp(mgmt->frame_control)) {
+		old = rcu_access_pointer(nontrans_bss->proberesp_ies);
+		rcu_assign_pointer(nontrans_bss->proberesp_ies, new_ies);
+		rcu_assign_pointer(nontrans_bss->ies, new_ies);
+		if (old)
+			kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
+	} else {
+		old = rcu_access_pointer(nontrans_bss->beacon_ies);
+		rcu_assign_pointer(nontrans_bss->beacon_ies, new_ies);
+		cfg80211_update_hidden_bsses(bss_from_pub(nontrans_bss),
+					     new_ies, old);
+		rcu_assign_pointer(nontrans_bss->ies, new_ies);
+		if (old)
+			kfree_rcu((struct cfg80211_bss_ies *)old, rcu_head);
+	}
+
+out_free:
+	kfree(new_ie);
+}
+
+/* cfg80211_inform_bss_width_frame helper */
+static struct cfg80211_bss *
+cfg80211_inform_single_bss_frame_data(struct wiphy *wiphy,
+				      struct cfg80211_inform_bss *data,
+				      struct ieee80211_mgmt *mgmt, size_t len,
+				      gfp_t gfp)
+{
+	struct cfg80211_internal_bss tmp = {}, *res;
+	struct cfg80211_bss_ies *ies;
+	struct ieee80211_channel *channel;
+	bool signal_valid;
+	struct ieee80211_ext *ext = NULL;
+	u8 *bssid, *variable;
+	u16 capability, beacon_int;
+	size_t ielen, min_hdr_len = offsetof(struct ieee80211_mgmt,
+					     u.probe_resp.variable);
+	int bss_type;
+
+	BUILD_BUG_ON(offsetof(struct ieee80211_mgmt, u.probe_resp.variable) !=
+			offsetof(struct ieee80211_mgmt, u.beacon.variable));
+
+	trace_cfg80211_inform_bss_frame(wiphy, data, mgmt, len);
+
+	if (WARN_ON(!mgmt))
+		return NULL;
+
+	if (WARN_ON(!wiphy))
+		return NULL;
+
+	if (WARN_ON(wiphy->signal_type == CFG80211_SIGNAL_TYPE_UNSPEC &&
+		    (data->signal < 0 || data->signal > 100)))
+		return NULL;
+
+	if (ieee80211_is_s1g_beacon(mgmt->frame_control)) {
+		ext = (void *) mgmt;
+		min_hdr_len = offsetof(struct ieee80211_ext, u.s1g_beacon);
+		if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
+			min_hdr_len = offsetof(struct ieee80211_ext,
+					       u.s1g_short_beacon.variable);
+	}
+
+	if (WARN_ON(len < min_hdr_len))
+		return NULL;
+
+	ielen = len - min_hdr_len;
+	variable = mgmt->u.probe_resp.variable;
+	if (ext) {
+		if (ieee80211_is_s1g_short_beacon(mgmt->frame_control))
+			variable = ext->u.s1g_short_beacon.variable;
+		else
+			variable = ext->u.s1g_beacon.variable;
+	}
+
+	channel = cfg80211_get_bss_channel(wiphy, variable,
+					   ielen, data->chan, data->scan_width);
+	if (!channel)
+		return NULL;
+
+	if (ext) {
+		const struct ieee80211_s1g_bcn_compat_ie *compat;
+		const struct element *elem;
+
+		elem = cfg80211_find_elem(WLAN_EID_S1G_BCN_COMPAT,
+					  variable, ielen);
+		if (!elem)
+			return NULL;
+		if (elem->datalen < sizeof(*compat))
+			return NULL;
+		compat = (void *)elem->data;
+		bssid = ext->u.s1g_beacon.sa;
+		capability = le16_to_cpu(compat->compat_info);
+		beacon_int = le16_to_cpu(compat->beacon_int);
+	} else {
+		bssid = mgmt->bssid;
+		beacon_int = le16_to_cpu(mgmt->u.probe_resp.beacon_int);
+		capability = le16_to_cpu(mgmt->u.probe_resp.capab_info);
+	}
+
+	ies = kzalloc(sizeof(*ies) + ielen, gfp);
+	if (!ies)
+		return NULL;
+	ies->len = ielen;
+	ies->tsf = le64_to_cpu(mgmt->u.probe_resp.timestamp);
+	ies->from_beacon = ieee80211_is_beacon(mgmt->frame_control) ||
+			   ieee80211_is_s1g_beacon(mgmt->frame_control);
+	memcpy(ies->data, variable, ielen);
+
+	if (ieee80211_is_probe_resp(mgmt->frame_control))
+		rcu_assign_pointer(tmp.pub.proberesp_ies, ies);
+	else
+		rcu_assign_pointer(tmp.pub.beacon_ies, ies);
+	rcu_assign_pointer(tmp.pub.ies, ies);
+
+	memcpy(tmp.pub.bssid, bssid, ETH_ALEN);
+	tmp.pub.beacon_interval = beacon_int;
+	tmp.pub.capability = capability;
+	tmp.pub.channel = channel;
+	tmp.pub.scan_width = data->scan_width;
+	tmp.pub.signal = data->signal;
+	tmp.ts_boottime = data->boottime_ns;
+	tmp.parent_tsf = data->parent_tsf;
+	tmp.pub.chains = data->chains;
+	memcpy(tmp.pub.chain_signal, data->chain_signal, IEEE80211_MAX_CHAINS);
+	ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
+
+	signal_valid = data->chan == channel;
+	res = cfg80211_bss_update(wiphy_to_rdev(wiphy), &tmp, signal_valid,
+				  jiffies);
+	if (!res)
+		return NULL;
+
+	if (channel->band == NL80211_BAND_60GHZ) {
+		bss_type = res->pub.capability & WLAN_CAPABILITY_DMG_TYPE_MASK;
+		if (bss_type == WLAN_CAPABILITY_DMG_TYPE_AP ||
+		    bss_type == WLAN_CAPABILITY_DMG_TYPE_PBSS)
+			regulatory_hint_found_beacon(wiphy, channel, gfp);
+	} else {
+		if (res->pub.capability & WLAN_CAPABILITY_ESS)
+			regulatory_hint_found_beacon(wiphy, channel, gfp);
+	}
+
+	trace_cfg80211_return_bss(&res->pub);
+	/* cfg80211_bss_update gives us a referenced result */
+	return &res->pub;
+}
+
+struct cfg80211_bss *
+cfg80211_inform_bss_frame_data(struct wiphy *wiphy,
+			       struct cfg80211_inform_bss *data,
+			       struct ieee80211_mgmt *mgmt, size_t len,
+			       gfp_t gfp)
+{
+	struct cfg80211_bss *res, *tmp_bss;
+	const u8 *ie = mgmt->u.probe_resp.variable;
+	const struct cfg80211_bss_ies *ies1, *ies2;
+	size_t ielen = len - offsetof(struct ieee80211_mgmt,
+				      u.probe_resp.variable);
+	struct cfg80211_non_tx_bss non_tx_data = {};
+
+	res = cfg80211_inform_single_bss_frame_data(wiphy, data, mgmt,
+						    len, gfp);
+
+	/* don't do any further MBSSID handling for S1G */
+	if (ieee80211_is_s1g_beacon(mgmt->frame_control))
+		return res;
+
+	if (!res || !wiphy->support_mbssid ||
+	    !cfg80211_find_ie(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
+		return res;
+	if (wiphy->support_only_he_mbssid &&
+	    !cfg80211_find_ext_ie(WLAN_EID_EXT_HE_CAPABILITY, ie, ielen))
+		return res;
+
+	non_tx_data.tx_bss = res;
+	/* process each non-transmitting bss */
+	cfg80211_parse_mbssid_frame_data(wiphy, data, mgmt, len,
+					 &non_tx_data, gfp);
+
+	spin_lock_bh(&wiphy_to_rdev(wiphy)->bss_lock);
+
+	/* check if the res has other nontransmitting bss which is not
+	 * in MBSSID IE
+	 */
+	ies1 = rcu_access_pointer(res->ies);
+
+	/* go through nontrans_list, if the timestamp of the BSS is
+	 * earlier than the timestamp of the transmitting BSS then
+	 * update it
+	 */
+	list_for_each_entry(tmp_bss, &res->nontrans_list,
+			    nontrans_list) {
+		ies2 = rcu_access_pointer(tmp_bss->ies);
+		if (ies2->tsf < ies1->tsf)
+			cfg80211_update_notlisted_nontrans(wiphy, tmp_bss,
+							   mgmt, len);
+	}
+	spin_unlock_bh(&wiphy_to_rdev(wiphy)->bss_lock);
+
+	return res;
+}
+EXPORT_SYMBOL(cfg80211_inform_bss_frame_data);
+
+void cfg80211_ref_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
+{
+	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+	struct cfg80211_internal_bss *bss;
+
+	if (!pub)
+		return;
+
+	bss = container_of(pub, struct cfg80211_internal_bss, pub);
+
+	spin_lock_bh(&rdev->bss_lock);
+	bss_ref_get(rdev, bss);
+	spin_unlock_bh(&rdev->bss_lock);
+}
+EXPORT_SYMBOL(cfg80211_ref_bss);
+
+void cfg80211_put_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
+{
+	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+	struct cfg80211_internal_bss *bss;
+
+	if (!pub)
+		return;
+
+	bss = container_of(pub, struct cfg80211_internal_bss, pub);
+
+	spin_lock_bh(&rdev->bss_lock);
+	bss_ref_put(rdev, bss);
+	spin_unlock_bh(&rdev->bss_lock);
+}
+EXPORT_SYMBOL(cfg80211_put_bss);
+
+void cfg80211_unlink_bss(struct wiphy *wiphy, struct cfg80211_bss *pub)
+{
+	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+	struct cfg80211_internal_bss *bss, *tmp1;
+	struct cfg80211_bss *nontrans_bss, *tmp;
+
+	if (WARN_ON(!pub))
+		return;
+
+	bss = container_of(pub, struct cfg80211_internal_bss, pub);
+
+	spin_lock_bh(&rdev->bss_lock);
+	if (list_empty(&bss->list))
+		goto out;
+
+	list_for_each_entry_safe(nontrans_bss, tmp,
+				 &pub->nontrans_list,
+				 nontrans_list) {
+		tmp1 = container_of(nontrans_bss,
+				    struct cfg80211_internal_bss, pub);
+		if (__cfg80211_unlink_bss(rdev, tmp1))
+			rdev->bss_generation++;
+	}
+
+	if (__cfg80211_unlink_bss(rdev, bss))
+		rdev->bss_generation++;
+out:
+	spin_unlock_bh(&rdev->bss_lock);
+}
+EXPORT_SYMBOL(cfg80211_unlink_bss);
+
+void cfg80211_bss_iter(struct wiphy *wiphy,
+		       struct cfg80211_chan_def *chandef,
+		       void (*iter)(struct wiphy *wiphy,
+				    struct cfg80211_bss *bss,
+				    void *data),
+		       void *iter_data)
+{
+	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+	struct cfg80211_internal_bss *bss;
+
+	spin_lock_bh(&rdev->bss_lock);
+
+	list_for_each_entry(bss, &rdev->bss_list, list) {
+		if (!chandef || cfg80211_is_sub_chan(chandef, bss->pub.channel))
+			iter(wiphy, &bss->pub, iter_data);
+	}
+
+	spin_unlock_bh(&rdev->bss_lock);
+}
+EXPORT_SYMBOL(cfg80211_bss_iter);
+
+void cfg80211_update_assoc_bss_entry(struct wireless_dev *wdev,
+				     struct ieee80211_channel *chan)
+{
+	struct wiphy *wiphy = wdev->wiphy;
+	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
+	struct cfg80211_internal_bss *cbss = wdev->current_bss;
+	struct cfg80211_internal_bss *new = NULL;
+	struct cfg80211_internal_bss *bss;
+	struct cfg80211_bss *nontrans_bss;
+	struct cfg80211_bss *tmp;
+
+	spin_lock_bh(&rdev->bss_lock);
+
+	/*
+	 * Some APs use CSA also for bandwidth changes, i.e., without actually
+	 * changing the control channel, so no need to update in such a case.
+	 */
+	if (cbss->pub.channel == chan)
+		goto done;
+
+	/* use transmitting bss */
+	if (cbss->pub.transmitted_bss)
+		cbss = container_of(cbss->pub.transmitted_bss,
+				    struct cfg80211_internal_bss,
+				    pub);
+
+	cbss->pub.channel = chan;
+
+	list_for_each_entry(bss, &rdev->bss_list, list) {
+		if (!cfg80211_bss_type_match(bss->pub.capability,
+					     bss->pub.channel->band,
+					     wdev->conn_bss_type))
+			continue;
+
+		if (bss == cbss)
+			continue;
+
+		if (!cmp_bss(&bss->pub, &cbss->pub, BSS_CMP_REGULAR)) {
+			new = bss;
+			break;
+		}
+	}
+
+	if (new) {
+		/* to save time, update IEs for transmitting bss only */
+		if (cfg80211_update_known_bss(rdev, cbss, new, false)) {
+			new->pub.proberesp_ies = NULL;
+			new->pub.beacon_ies = NULL;
+		}
+
+		list_for_each_entry_safe(nontrans_bss, tmp,
+					 &new->pub.nontrans_list,
+					 nontrans_list) {
+			bss = container_of(nontrans_bss,
+					   struct cfg80211_internal_bss, pub);
+			if (__cfg80211_unlink_bss(rdev, bss))
+				rdev->bss_generation++;
+		}
+
+		WARN_ON(atomic_read(&new->hold));
+		if (!WARN_ON(!__cfg80211_unlink_bss(rdev, new)))
+			rdev->bss_generation++;
+	}
+
+	rb_erase(&cbss->rbn, &rdev->bss_tree);
+	rb_insert_bss(rdev, cbss);
+	rdev->bss_generation++;
+
+	list_for_each_entry_safe(nontrans_bss, tmp,
+				 &cbss->pub.nontrans_list,
+				 nontrans_list) {
+		bss = container_of(nontrans_bss,
+				   struct cfg80211_internal_bss, pub);
+		bss->pub.channel = chan;
+		rb_erase(&bss->rbn, &rdev->bss_tree);
+		rb_insert_bss(rdev, bss);
+		rdev->bss_generation++;
+	}
+
+done:
+	spin_unlock_bh(&rdev->bss_lock);
+}
+
+#ifdef CONFIG_CFG80211_WEXT
+static struct cfg80211_registered_device *
+cfg80211_get_dev_from_ifindex(struct net *net, int ifindex)
+{
+	struct cfg80211_registered_device *rdev;
+	struct net_device *dev;
+
+	ASSERT_RTNL();
+
+	dev = dev_get_by_index(net, ifindex);
+	if (!dev)
+		return ERR_PTR(-ENODEV);
+	if (dev->ieee80211_ptr)
+		rdev = wiphy_to_rdev(dev->ieee80211_ptr->wiphy);
+	else
+		rdev = ERR_PTR(-ENODEV);
+	dev_put(dev);
+	return rdev;
+}
+
+int cfg80211_wext_siwscan(struct net_device *dev,
+			  struct iw_request_info *info,
+			  union iwreq_data *wrqu, char *extra)
+{
+	struct cfg80211_registered_device *rdev;
+	struct wiphy *wiphy;
+	struct iw_scan_req *wreq = NULL;
+	struct cfg80211_scan_request *creq = NULL;
+	int i, err, n_channels = 0;
+	enum nl80211_band band;
+
+	if (!netif_running(dev))
+		return -ENETDOWN;
+
+	if (wrqu->data.length == sizeof(struct iw_scan_req))
+		wreq = (struct iw_scan_req *)extra;
+
+	rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
+
+	if (IS_ERR(rdev))
+		return PTR_ERR(rdev);
+
+	if (rdev->scan_req || rdev->scan_msg) {
+		err = -EBUSY;
+		goto out;
+	}
+
+	wiphy = &rdev->wiphy;
+
+	/* Determine number of channels, needed to allocate creq */
+	if (wreq && wreq->num_channels)
+		n_channels = wreq->num_channels;
+	else
+		n_channels = ieee80211_get_num_supported_channels(wiphy);
+
+	creq = kzalloc(sizeof(*creq) + sizeof(struct cfg80211_ssid) +
+		       n_channels * sizeof(void *),
+		       GFP_ATOMIC);
+	if (!creq) {
+		err = -ENOMEM;
+		goto out;
+	}
+
+	creq->wiphy = wiphy;
+	creq->wdev = dev->ieee80211_ptr;
+	/* SSIDs come after channels */
+	creq->ssids = (void *)&creq->channels[n_channels];
+	creq->n_channels = n_channels;
+	creq->n_ssids = 1;
+	creq->scan_start = jiffies;
+
+	/* translate "Scan on frequencies" request */
+	i = 0;
+	for (band = 0; band < NUM_NL80211_BANDS; band++) {
+		int j;
+
+		if (!wiphy->bands[band])
+			continue;
+
+		for (j = 0; j < wiphy->bands[band]->n_channels; j++) {
+			/* ignore disabled channels */
+			if (wiphy->bands[band]->channels[j].flags &
+						IEEE80211_CHAN_DISABLED)
+				continue;
+
+			/* If we have a wireless request structure and the
+			 * wireless request specifies frequencies, then search
+			 * for the matching hardware channel.
+			 */
+			if (wreq && wreq->num_channels) {
+				int k;
+				int wiphy_freq = wiphy->bands[band]->channels[j].center_freq;
+				for (k = 0; k < wreq->num_channels; k++) {
+					struct iw_freq *freq =
+						&wreq->channel_list[k];
+					int wext_freq =
+						cfg80211_wext_freq(freq);
+
+					if (wext_freq == wiphy_freq)
+						goto wext_freq_found;
+				}
+				goto wext_freq_not_found;
+			}
+
+		wext_freq_found:
+			creq->channels[i] = &wiphy->bands[band]->channels[j];
+			i++;
+		wext_freq_not_found: ;
+		}
+	}
+	/* No channels found? */
+	if (!i) {
+		err = -EINVAL;
+		goto out;
+	}
+
+	/* Set real number of channels specified in creq->channels[] */
+	creq->n_channels = i;
+
+	/* translate "Scan for SSID" request */
+	if (wreq) {
+		if (wrqu->data.flags & IW_SCAN_THIS_ESSID) {
+			if (wreq->essid_len > IEEE80211_MAX_SSID_LEN) {
+				err = -EINVAL;
+				goto out;
+			}
+			memcpy(creq->ssids[0].ssid, wreq->essid, wreq->essid_len);
+			creq->ssids[0].ssid_len = wreq->essid_len;
+		}
+		if (wreq->scan_type == IW_SCAN_TYPE_PASSIVE)
+			creq->n_ssids = 0;
+	}
+
+	for (i = 0; i < NUM_NL80211_BANDS; i++)
+		if (wiphy->bands[i])
+			creq->rates[i] = (1 << wiphy->bands[i]->n_bitrates) - 1;
+
+	eth_broadcast_addr(creq->bssid);
+
+	rdev->scan_req = creq;
+	err = rdev_scan(rdev, creq);
+	if (err) {
+		rdev->scan_req = NULL;
+		/* creq will be freed below */
+	} else {
+		nl80211_send_scan_start(rdev, dev->ieee80211_ptr);
+		/* creq now owned by driver */
+		creq = NULL;
+		dev_hold(dev);
+	}
+ out:
+	kfree(creq);
+	return err;
+}
+EXPORT_WEXT_HANDLER(cfg80211_wext_siwscan);
+
+static char *ieee80211_scan_add_ies(struct iw_request_info *info,
+				    const struct cfg80211_bss_ies *ies,
+				    char *current_ev, char *end_buf)
+{
+	const u8 *pos, *end, *next;
+	struct iw_event iwe;
+
+	if (!ies)
+		return current_ev;
+
+	/*
+	 * If needed, fragment the IEs buffer (at IE boundaries) into short
+	 * enough fragments to fit into IW_GENERIC_IE_MAX octet messages.
+	 */
+	pos = ies->data;
+	end = pos + ies->len;
+
+	while (end - pos > IW_GENERIC_IE_MAX) {
+		next = pos + 2 + pos[1];
+		while (next + 2 + next[1] - pos < IW_GENERIC_IE_MAX)
+			next = next + 2 + next[1];
+
+		memset(&iwe, 0, sizeof(iwe));
+		iwe.cmd = IWEVGENIE;
+		iwe.u.data.length = next - pos;
+		current_ev = iwe_stream_add_point_check(info, current_ev,
+							end_buf, &iwe,
+							(void *)pos);
+		if (IS_ERR(current_ev))
+			return current_ev;
+		pos = next;
+	}
+
+	if (end > pos) {
+		memset(&iwe, 0, sizeof(iwe));
+		iwe.cmd = IWEVGENIE;
+		iwe.u.data.length = end - pos;
+		current_ev = iwe_stream_add_point_check(info, current_ev,
+							end_buf, &iwe,
+							(void *)pos);
+		if (IS_ERR(current_ev))
+			return current_ev;
+	}
+
+	return current_ev;
+}
+
+static char *
+ieee80211_bss(struct wiphy *wiphy, struct iw_request_info *info,
+	      struct cfg80211_internal_bss *bss, char *current_ev,
+	      char *end_buf)
+{
+	const struct cfg80211_bss_ies *ies;
+	struct iw_event iwe;
+	const u8 *ie;
+	u8 buf[50];
+	u8 *cfg, *p, *tmp;
+	int rem, i, sig;
+	bool ismesh = false;
+
+	memset(&iwe, 0, sizeof(iwe));
+	iwe.cmd = SIOCGIWAP;
+	iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
+	memcpy(iwe.u.ap_addr.sa_data, bss->pub.bssid, ETH_ALEN);
+	current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
+						IW_EV_ADDR_LEN);
+	if (IS_ERR(current_ev))
+		return current_ev;
+
+	memset(&iwe, 0, sizeof(iwe));
+	iwe.cmd = SIOCGIWFREQ;
+	iwe.u.freq.m = ieee80211_frequency_to_channel(bss->pub.channel->center_freq);
+	iwe.u.freq.e = 0;
+	current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
+						IW_EV_FREQ_LEN);
+	if (IS_ERR(current_ev))
+		return current_ev;
+
+	memset(&iwe, 0, sizeof(iwe));
+	iwe.cmd = SIOCGIWFREQ;
+	iwe.u.freq.m = bss->pub.channel->center_freq;
+	iwe.u.freq.e = 6;
+	current_ev = iwe_stream_add_event_check(info, current_ev, end_buf, &iwe,
+						IW_EV_FREQ_LEN);
+	if (IS_ERR(current_ev))
+		return current_ev;
+
+	if (wiphy->signal_type != CFG80211_SIGNAL_TYPE_NONE) {
+		memset(&iwe, 0, sizeof(iwe));
+		iwe.cmd = IWEVQUAL;
+		iwe.u.qual.updated = IW_QUAL_LEVEL_UPDATED |
+				     IW_QUAL_NOISE_INVALID |
+				     IW_QUAL_QUAL_UPDATED;
+		switch (wiphy->signal_type) {
+		case CFG80211_SIGNAL_TYPE_MBM:
+			sig = bss->pub.signal / 100;
+			iwe.u.qual.level = sig;
+			iwe.u.qual.updated |= IW_QUAL_DBM;
+			if (sig < -110)		/* rather bad */
+				sig = -110;
+			else if (sig > -40)	/* perfect */
+				sig = -40;
+			/* will give a range of 0 .. 70 */
+			iwe.u.qual.qual = sig + 110;
+			break;
+		case CFG80211_SIGNAL_TYPE_UNSPEC:
+			iwe.u.qual.level = bss->pub.signal;
+			/* will give range 0 .. 100 */
+			iwe.u.qual.qual = bss->pub.signal;
+			break;
+		default:
+			/* not reached */
+			break;
+		}
+		current_ev = iwe_stream_add_event_check(info, current_ev,
+							end_buf, &iwe,
+							IW_EV_QUAL_LEN);
+		if (IS_ERR(current_ev))
+			return current_ev;
+	}
+
+	memset(&iwe, 0, sizeof(iwe));
+	iwe.cmd = SIOCGIWENCODE;
+	if (bss->pub.capability & WLAN_CAPABILITY_PRIVACY)
+		iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
+	else
+		iwe.u.data.flags = IW_ENCODE_DISABLED;
+	iwe.u.data.length = 0;
+	current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
+						&iwe, "");
+	if (IS_ERR(current_ev))
+		return current_ev;
+
+	rcu_read_lock();
+	ies = rcu_dereference(bss->pub.ies);
+	rem = ies->len;
+	ie = ies->data;
+
+	while (rem >= 2) {
+		/* invalid data */
+		if (ie[1] > rem - 2)
+			break;
+
+		switch (ie[0]) {
+		case WLAN_EID_SSID:
+			memset(&iwe, 0, sizeof(iwe));
+			iwe.cmd = SIOCGIWESSID;
+			iwe.u.data.length = ie[1];
+			iwe.u.data.flags = 1;
+			current_ev = iwe_stream_add_point_check(info,
+								current_ev,
+								end_buf, &iwe,
+								(u8 *)ie + 2);
+			if (IS_ERR(current_ev))
+				goto unlock;
+			break;
+		case WLAN_EID_MESH_ID:
+			memset(&iwe, 0, sizeof(iwe));
+			iwe.cmd = SIOCGIWESSID;
+			iwe.u.data.length = ie[1];
+			iwe.u.data.flags = 1;
+			current_ev = iwe_stream_add_point_check(info,
+								current_ev,
+								end_buf, &iwe,
+								(u8 *)ie + 2);
+			if (IS_ERR(current_ev))
+				goto unlock;
+			break;
+		case WLAN_EID_MESH_CONFIG:
+			ismesh = true;
+			if (ie[1] != sizeof(struct ieee80211_meshconf_ie))
+				break;
+			cfg = (u8 *)ie + 2;
+			memset(&iwe, 0, sizeof(iwe));
+			iwe.cmd = IWEVCUSTOM;
+			sprintf(buf, "Mesh Network Path Selection Protocol ID: "
+				"0x%02X", cfg[0]);
+			iwe.u.data.length = strlen(buf);
+			current_ev = iwe_stream_add_point_check(info,
+								current_ev,
+								end_buf,
+								&iwe, buf);
+			if (IS_ERR(current_ev))
+				goto unlock;
+			sprintf(buf, "Path Selection Metric ID: 0x%02X",
+				cfg[1]);
+			iwe.u.data.length = strlen(buf);
+			current_ev = iwe_stream_add_point_check(info,
+								current_ev,
+								end_buf,
+								&iwe, buf);
+			if (IS_ERR(current_ev))
+				goto unlock;
+			sprintf(buf, "Congestion Control Mode ID: 0x%02X",
+				cfg[2]);
+			iwe.u.data.length = strlen(buf);
+			current_ev = iwe_stream_add_point_check(info,
+								current_ev,
+								end_buf,
+								&iwe, buf);
+			if (IS_ERR(current_ev))
+				goto unlock;
+			sprintf(buf, "Synchronization ID: 0x%02X", cfg[3]);
+			iwe.u.data.length = strlen(buf);
+			current_ev = iwe_stream_add_point_check(info,
+								current_ev,
+								end_buf,
+								&iwe, buf);
+			if (IS_ERR(current_ev))
+				goto unlock;
+			sprintf(buf, "Authentication ID: 0x%02X", cfg[4]);
+			iwe.u.data.length = strlen(buf);
+			current_ev = iwe_stream_add_point_check(info,
+								current_ev,
+								end_buf,
+								&iwe, buf);
+			if (IS_ERR(current_ev))
+				goto unlock;
+			sprintf(buf, "Formation Info: 0x%02X", cfg[5]);
+			iwe.u.data.length = strlen(buf);
+			current_ev = iwe_stream_add_point_check(info,
+								current_ev,
+								end_buf,
+								&iwe, buf);
+			if (IS_ERR(current_ev))
+				goto unlock;
+			sprintf(buf, "Capabilities: 0x%02X", cfg[6]);
+			iwe.u.data.length = strlen(buf);
+			current_ev = iwe_stream_add_point_check(info,
+								current_ev,
+								end_buf,
+								&iwe, buf);
+			if (IS_ERR(current_ev))
+				goto unlock;
+			break;
+		case WLAN_EID_SUPP_RATES:
+		case WLAN_EID_EXT_SUPP_RATES:
+			/* display all supported rates in readable format */
+			p = current_ev + iwe_stream_lcp_len(info);
+
+			memset(&iwe, 0, sizeof(iwe));
+			iwe.cmd = SIOCGIWRATE;
+			/* Those two flags are ignored... */
+			iwe.u.bitrate.fixed = iwe.u.bitrate.disabled = 0;
+
+			for (i = 0; i < ie[1]; i++) {
+				iwe.u.bitrate.value =
+					((ie[i + 2] & 0x7f) * 500000);
+				tmp = p;
+				p = iwe_stream_add_value(info, current_ev, p,
+							 end_buf, &iwe,
+							 IW_EV_PARAM_LEN);
+				if (p == tmp) {
+					current_ev = ERR_PTR(-E2BIG);
+					goto unlock;
+				}
+			}
+			current_ev = p;
+			break;
+		}
+		rem -= ie[1] + 2;
+		ie += ie[1] + 2;
+	}
+
+	if (bss->pub.capability & (WLAN_CAPABILITY_ESS | WLAN_CAPABILITY_IBSS) ||
+	    ismesh) {
+		memset(&iwe, 0, sizeof(iwe));
+		iwe.cmd = SIOCGIWMODE;
+		if (ismesh)
+			iwe.u.mode = IW_MODE_MESH;
+		else if (bss->pub.capability & WLAN_CAPABILITY_ESS)
+			iwe.u.mode = IW_MODE_MASTER;
+		else
+			iwe.u.mode = IW_MODE_ADHOC;
+		current_ev = iwe_stream_add_event_check(info, current_ev,
+							end_buf, &iwe,
+							IW_EV_UINT_LEN);
+		if (IS_ERR(current_ev))
+			goto unlock;
+	}
+
+	memset(&iwe, 0, sizeof(iwe));
+	iwe.cmd = IWEVCUSTOM;
+	sprintf(buf, "tsf=%016llx", (unsigned long long)(ies->tsf));
+	iwe.u.data.length = strlen(buf);
+	current_ev = iwe_stream_add_point_check(info, current_ev, end_buf,
+						&iwe, buf);
+	if (IS_ERR(current_ev))
+		goto unlock;
+	memset(&iwe, 0, sizeof(iwe));
+	iwe.cmd = IWEVCUSTOM;
+	sprintf(buf, " Last beacon: %ums ago",
+		elapsed_jiffies_msecs(bss->ts));
+	iwe.u.data.length = strlen(buf);
+	current_ev = iwe_stream_add_point_check(info, current_ev,
+						end_buf, &iwe, buf);
+	if (IS_ERR(current_ev))
+		goto unlock;
+
+	current_ev = ieee80211_scan_add_ies(info, ies, current_ev, end_buf);
+
+ unlock:
+	rcu_read_unlock();
+	return current_ev;
+}
+
+
+static int ieee80211_scan_results(struct cfg80211_registered_device *rdev,
+				  struct iw_request_info *info,
+				  char *buf, size_t len)
+{
+	char *current_ev = buf;
+	char *end_buf = buf + len;
+	struct cfg80211_internal_bss *bss;
+	int err = 0;
+
+	spin_lock_bh(&rdev->bss_lock);
+	cfg80211_bss_expire(rdev);
+
+	list_for_each_entry(bss, &rdev->bss_list, list) {
+		if (buf + len - current_ev <= IW_EV_ADDR_LEN) {
+			err = -E2BIG;
+			break;
+		}
+		current_ev = ieee80211_bss(&rdev->wiphy, info, bss,
+					   current_ev, end_buf);
+		if (IS_ERR(current_ev)) {
+			err = PTR_ERR(current_ev);
+			break;
+		}
+	}
+	spin_unlock_bh(&rdev->bss_lock);
+
+	if (err)
+		return err;
+	return current_ev - buf;
+}
+
+
+int cfg80211_wext_giwscan(struct net_device *dev,
+			  struct iw_request_info *info,
+			  struct iw_point *data, char *extra)
+{
+	struct cfg80211_registered_device *rdev;
+	int res;
+
+	if (!netif_running(dev))
+		return -ENETDOWN;
+
+	rdev = cfg80211_get_dev_from_ifindex(dev_net(dev), dev->ifindex);
+
+	if (IS_ERR(rdev))
+		return PTR_ERR(rdev);
+
+	if (rdev->scan_req || rdev->scan_msg)
+		return -EAGAIN;
+
+	res = ieee80211_scan_results(rdev, info, extra, data->length);
+	data->length = 0;
+	if (res >= 0) {
+		data->length = res;
+		res = 0;
+	}
+
+	return res;
+}
+EXPORT_WEXT_HANDLER(cfg80211_wext_giwscan);
+#endif