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	Version: linux-6.0.1 spark-3.0.0 hadoop-3.2.0-src hadoop-3.3.0-src spark-2.4.7 linux-4.15.13 hadoop-2.7.4-src Revert   Change

 // 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) 2018-2022 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 = container_of(bss->pub.hidden_beacon_bss,
                    struct cfg80211_internal_bss,
                    pub);
         bss->refcount++;
     }
     if (bss->pub.transmitted_bss) {
         bss = container_of(bss->pub.transmitted_bss,
                    struct cfg80211_internal_bss,
                    pub);
         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_gen_new_ie(const u8 *ie, size_t ielen,
                   const u8 *subelement, size_t subie_len,
                   u8 *new_ie, gfp_t gfp)
 {
     u8 *pos, *tmp;
     const u8 *tmp_old, *tmp_new;
     const struct element *non_inherit_elem;
     u8 *sub_copy;
 
     /* copy subelement as we need to change its content to
      * mark an ie after it is processed.
      */
     sub_copy = kmemdup(subelement, subie_len, gfp);
     if (!sub_copy)
         return 0;
 
     pos = &new_ie[0];
 
     /* set new ssid */
     tmp_new = cfg80211_find_ie(WLAN_EID_SSID, sub_copy, subie_len);
     if (tmp_new) {
         memcpy(pos, tmp_new, tmp_new[1] + 2);
         pos += (tmp_new[1] + 2);
     }
 
     /* get non inheritance list if exists */
     non_inherit_elem =
         cfg80211_find_ext_elem(WLAN_EID_EXT_NON_INHERITANCE,
                        sub_copy, subie_len);
 
     /* go through IEs in ie (skip SSID) and subelement,
      * merge them into new_ie
      */
     tmp_old = cfg80211_find_ie(WLAN_EID_SSID, ie, ielen);
     tmp_old = (tmp_old) ? tmp_old + tmp_old[1] + 2 : ie;
 
     while (tmp_old + tmp_old[1] + 2 - ie <= ielen) {
         if (tmp_old[0] == 0) {
             tmp_old++;
             continue;
         }
 
         if (tmp_old[0] == WLAN_EID_EXTENSION)
             tmp = (u8 *)cfg80211_find_ext_ie(tmp_old[2], sub_copy,
                              subie_len);
         else
             tmp = (u8 *)cfg80211_find_ie(tmp_old[0], sub_copy,
                              subie_len);
 
         if (!tmp) {
             const struct element *old_elem = (void *)tmp_old;
 
             /* ie in old ie but not in subelement */
             if (cfg80211_is_element_inherited(old_elem,
                               non_inherit_elem)) {
                 memcpy(pos, tmp_old, tmp_old[1] + 2);
                 pos += tmp_old[1] + 2;
             }
         } else {
             /* ie in transmitting ie also in subelement,
              * copy from subelement and flag the ie in subelement
              * as copied (by setting eid field to WLAN_EID_SSID,
              * which is skipped anyway).
              * For vendor ie, compare OUI + type + subType to
              * determine if they are the same ie.
              */
             if (tmp_old[0] == WLAN_EID_VENDOR_SPECIFIC) {
                 if (!memcmp(tmp_old + 2, tmp + 2, 5)) {
                     /* same vendor ie, copy from
                      * subelement
                      */
                     memcpy(pos, tmp, tmp[1] + 2);
                     pos += tmp[1] + 2;
                     tmp[0] = WLAN_EID_SSID;
                 } else {
                     memcpy(pos, tmp_old, tmp_old[1] + 2);
                     pos += tmp_old[1] + 2;
                 }
             } else {
                 /* copy ie from subelement into new ie */
                 memcpy(pos, tmp, tmp[1] + 2);
                 pos += tmp[1] + 2;
                 tmp[0] = WLAN_EID_SSID;
             }
         }
 
         if (tmp_old + tmp_old[1] + 2 - ie == ielen)
             break;
 
         tmp_old += tmp_old[1] + 2;
     }
 
     /* go through subelement again to check if there is any ie not
      * copied to new ie, skip ssid, capability, bssid-index ie
      */
     tmp_new = sub_copy;
     while (tmp_new + tmp_new[1] + 2 - sub_copy <= subie_len) {
         if (!(tmp_new[0] == WLAN_EID_NON_TX_BSSID_CAP ||
               tmp_new[0] == WLAN_EID_SSID)) {
             memcpy(pos, tmp_new, tmp_new[1] + 2);
             pos += tmp_new[1] + 2;
         }
         if (tmp_new + tmp_new[1] + 2 - sub_copy == subie_len)
             break;
         tmp_new += tmp_new[1] + 2;
     }
 
     kfree(sub_copy);
     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 struct element *ssid_elem;
 
     if (bssid && !ether_addr_equal(a->bssid, bssid))
         return false;
 
     if (!ssid)
         return true;
 
     ies = rcu_access_pointer(a->ies);
     if (!ies)
         return false;
     ssid_elem = cfg80211_find_elem(WLAN_EID_SSID, ies->data, ies->len);
     if (!ssid_elem)
         return false;
     if (ssid_elem->datalen != ssid_len)
         return false;
     return memcmp(ssid_elem->data, ssid, ssid_len) == 0;
 }
 
 static int
 cfg80211_add_nontrans_list(struct cfg80211_bss *trans_bss,
                struct cfg80211_bss *nontrans_bss)
 {
     const struct element *ssid_elem;
     struct cfg80211_bss *bss = NULL;
 
     rcu_read_lock();
     ssid_elem = ieee80211_bss_get_elem(nontrans_bss, WLAN_EID_SSID);
     if (!ssid_elem) {
         rcu_read_unlock();
         return -EINVAL;
     }
 
     /* 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_elem->data,
                ssid_elem->datalen)) {
             rcu_read_unlock();
             return 0;
         }
     }
 
     rcu_read_unlock();
 
     /* 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)
         return 0;
 
     pos = elem->data;
     end = pos + elem->datalen;
 
     ret = cfg80211_calc_short_ssid(ies, &ssid_elem, &s_ssid_tmp);
     if (ret)
         return ret;
 
     /* 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 * length)
             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 * length;
             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 += length;
         }
     }
 
     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 = true;
     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 +
               sizeof(*request->ssids) * rdev_req->n_ssids,
               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 in case of direct scan with 1 SSID
      * and at least one of the reported co-located APs with same SSID
      * indicating that all APs in the same ESS are co-located
      */
     if (count && request->n_ssids == 1 && request->ssids[0].ssid_len) {
         list_for_each_entry(ap, &coloc_ap_list, list) {
             if (ap->colocated_ess &&
                 cfg80211_find_ssid_match(ap, request)) {
                 need_scan_psc = false;
                 break;
             }
         }
     }
 
     /*
      * 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 (!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;
 
         /*
          * Add the ssids from the parent scan request to the new scan
          * request, so the driver would be able to use them in its
          * probe requests to discover hidden APs on PSC channels.
          */
         request->ssids = (void *)&request->channels[request->n_channels];
         request->n_ssids = rdev_req->n_ssids;
         memcpy(request->ssids, rdev_req->ssids, sizeof(*request->ssids) *
                request->n_ssids);
 
         /*
          * 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
 
     lockdep_assert_held(&rdev->wiphy.mtx);
 
     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
 
     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);
 
     wiphy_lock(&rdev->wiphy);
     ___cfg80211_scan_done(rdev, true);
     wiphy_unlock(&rdev->wiphy);
 }
 
 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)
 {
     lockdep_assert_held(&rdev->wiphy.mtx);
 
     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)
 {
     lockdep_assert_held(&rdev->wiphy.mtx);
 
     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_is_held(&rdev->wiphy.mtx)) {
         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);
 
     wiphy_lock(&rdev->wiphy);
     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);
         }
     }
     wiphy_unlock(&rdev->wiphy);
 }
 
 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_locked(struct wiphy *wiphy, u64 reqid)
 {
     struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
 
     lockdep_assert_held(&wiphy->mtx);
 
     trace_cfg80211_sched_scan_stopped(wiphy, reqid);
 
     __cfg80211_stop_sched_scan(rdev, reqid, true);
 }
 EXPORT_SYMBOL(cfg80211_sched_scan_stopped_locked);
 
 void cfg80211_sched_scan_stopped(struct wiphy *wiphy, u64 reqid)
 {
     wiphy_lock(wiphy);
     cfg80211_sched_scan_stopped_locked(wiphy, reqid);
     wiphy_unlock(wiphy);
 }
 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)
 {
     lockdep_assert_held(&rdev->wiphy.mtx);
 
     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;
 
     lockdep_assert_held(&rdev->wiphy.mtx);
 
     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 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;
         struct cfg80211_internal_bss *bss;
 
         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);
 
         /* 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);
 
             rcu_assign_pointer(bss->pub.beacon_ies,
                        new->pub.beacon_ies);
         }
 
         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);
 
         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;
 }
 
 int cfg80211_get_ies_channel_number(const u8 *ie, size_t ielen,
                     enum nl80211_band band,
                     enum cfg80211_bss_frame_type ftype)
 {
     const struct element *tmp;
 
     if (band == NL80211_BAND_6GHZ) {
         struct ieee80211_he_operation *he_oper;
 
         tmp = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie,
                          ielen);
         if (tmp && tmp->datalen >= sizeof(*he_oper) &&
             tmp->datalen >= ieee80211_he_oper_size(&tmp->data[1])) {
             const struct ieee80211_he_6ghz_oper *he_6ghz_oper;
 
             he_oper = (void *)&tmp->data[1];
 
             he_6ghz_oper = ieee80211_he_6ghz_oper(he_oper);
             if (!he_6ghz_oper)
                 return -1;
 
             if (ftype != CFG80211_BSS_FTYPE_BEACON ||
                 he_6ghz_oper->control & IEEE80211_HE_6GHZ_OPER_CTRL_DUP_BEACON)
                 return he_6ghz_oper->primary;
         }
     } else if (band == NL80211_BAND_S1GHZ) {
         tmp = cfg80211_find_elem(WLAN_EID_S1G_OPERATION, ie, ielen);
         if (tmp && tmp->datalen >= sizeof(struct ieee80211_s1g_oper_ie)) {
             struct ieee80211_s1g_oper_ie *s1gop = (void *)tmp->data;
 
             return s1gop->oper_ch;
         }
     } else {
         tmp = cfg80211_find_elem(WLAN_EID_DS_PARAMS, ie, ielen);
         if (tmp && tmp->datalen == 1)
             return tmp->data[0];
 
         tmp = cfg80211_find_elem(WLAN_EID_HT_OPERATION, ie, ielen);
         if (tmp &&
             tmp->datalen >= sizeof(struct ieee80211_ht_operation)) {
             struct ieee80211_ht_operation *htop = (void *)tmp->data;
 
             return htop->primary_chan;
         }
     }
 
     return -1;
 }
 EXPORT_SYMBOL(cfg80211_get_ies_channel_number);
 
 /*
  * 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, or if the AP reports a different primary channel.
  */
 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,
              enum cfg80211_bss_frame_type ftype)
 {
     u32 freq;
     int channel_number;
     struct ieee80211_channel *alt_channel;
 
     channel_number = cfg80211_get_ies_channel_number(ie, ielen,
                              channel->band, ftype);
 
     if (channel_number < 0) {
         /* No channel information in frame payload */
         return channel;
     }
 
     freq = ieee80211_channel_to_freq_khz(channel_number, channel->band);
 
     /*
      * In 6GHz, duplicated beacon indication is relevant for
      * beacons only.
      */
     if (channel->band == NL80211_BAND_6GHZ &&
         (freq == channel->center_freq ||
          abs(freq - channel->center_freq) > 80))
         return channel;
 
     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, ftype);
     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;
     tmp.parent_tsf = data->parent_tsf;
     ether_addr_copy(tmp.parent_bssid, data->parent_bssid);
 
     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++;
         }
         spin_unlock_bh(&rdev->bss_lock);
     }
 
     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_elem(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
         return;
     if (!wiphy->support_mbssid)
         return;
     if (wiphy->support_only_he_mbssid &&
         !cfg80211_find_ext_elem(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;
         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,
                              gfp);
             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 struct element *nontrans_ssid;
     const u8 *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;
     u8 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_elem(nontrans_bss, WLAN_EID_SSID);
     if (!nontrans_ssid)
         return;
 
     new_ie_len += nontrans_ssid->datalen;
 
     /* 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->datalen + 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);
         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;
     enum cfg80211_bss_frame_type ftype;
 
     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;
     }
 
     if (ieee80211_is_beacon(mgmt->frame_control))
         ftype = CFG80211_BSS_FTYPE_BEACON;
     else if (ieee80211_is_probe_resp(mgmt->frame_control))
         ftype = CFG80211_BSS_FTYPE_PRESP;
     else
         ftype = CFG80211_BSS_FTYPE_UNKNOWN;
 
     channel = cfg80211_get_bss_channel(wiphy, variable,
                        ielen, data->chan, data->scan_width,
                        ftype);
     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);
     if (!res || !wiphy->support_mbssid ||
         !cfg80211_find_elem(WLAN_EID_MULTIPLE_BSSID, ie, ielen))
         return res;
     if (wiphy->support_only_he_mbssid &&
         !cfg80211_find_ext_elem(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,
                              false))
             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,
                      unsigned int link_id,
                      struct ieee80211_channel *chan)
 {
     struct wiphy *wiphy = wdev->wiphy;
     struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy);
     struct cfg80211_internal_bss *cbss = wdev->links[link_id].client.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;
     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)
         return -EBUSY;
 
     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)
         return -ENOMEM;
 
     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);
 
     wiphy_lock(&rdev->wiphy);
 
     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);
     }
     wiphy_unlock(&rdev->wiphy);
  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