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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-only
 /*
  * Copyright (c) 2008, 2009 open80211s Ltd.
  * Copyright (C) 2018 - 2022 Intel Corporation
  * Authors:    Luis Carlos Cobo <luisca@cozybit.com>
  *         Javier Cardona <javier@cozybit.com>
  */
 
 #include <linux/slab.h>
 #include <asm/unaligned.h>
 #include "ieee80211_i.h"
 #include "mesh.h"
 #include "driver-ops.h"
 
 static int mesh_allocated;
 static struct kmem_cache *rm_cache;
 
 bool mesh_action_is_path_sel(struct ieee80211_mgmt *mgmt)
 {
     return (mgmt->u.action.u.mesh_action.action_code ==
             WLAN_MESH_ACTION_HWMP_PATH_SELECTION);
 }
 
 void ieee80211s_init(void)
 {
     mesh_allocated = 1;
     rm_cache = kmem_cache_create("mesh_rmc", sizeof(struct rmc_entry),
                      0, 0, NULL);
 }
 
 void ieee80211s_stop(void)
 {
     if (!mesh_allocated)
         return;
     kmem_cache_destroy(rm_cache);
 }
 
 static void ieee80211_mesh_housekeeping_timer(struct timer_list *t)
 {
     struct ieee80211_sub_if_data *sdata =
         from_timer(sdata, t, u.mesh.housekeeping_timer);
     struct ieee80211_local *local = sdata->local;
     struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 
     set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
 
     ieee80211_queue_work(&local->hw, &sdata->work);
 }
 
 /**
  * mesh_matches_local - check if the config of a mesh point matches ours
  *
  * @sdata: local mesh subif
  * @ie: information elements of a management frame from the mesh peer
  *
  * This function checks if the mesh configuration of a mesh point matches the
  * local mesh configuration, i.e. if both nodes belong to the same mesh network.
  */
 bool mesh_matches_local(struct ieee80211_sub_if_data *sdata,
             struct ieee802_11_elems *ie)
 {
     struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
     u32 basic_rates = 0;
     struct cfg80211_chan_def sta_chan_def;
     struct ieee80211_supported_band *sband;
     u32 vht_cap_info = 0;
 
     /*
      * As support for each feature is added, check for matching
      * - On mesh config capabilities
      *   - Power Save Support En
      *   - Sync support enabled
      *   - Sync support active
      *   - Sync support required from peer
      *   - MDA enabled
      * - Power management control on fc
      */
     if (!(ifmsh->mesh_id_len == ie->mesh_id_len &&
          memcmp(ifmsh->mesh_id, ie->mesh_id, ie->mesh_id_len) == 0 &&
          (ifmsh->mesh_pp_id == ie->mesh_config->meshconf_psel) &&
          (ifmsh->mesh_pm_id == ie->mesh_config->meshconf_pmetric) &&
          (ifmsh->mesh_cc_id == ie->mesh_config->meshconf_congest) &&
          (ifmsh->mesh_sp_id == ie->mesh_config->meshconf_synch) &&
          (ifmsh->mesh_auth_id == ie->mesh_config->meshconf_auth)))
         return false;
 
     sband = ieee80211_get_sband(sdata);
     if (!sband)
         return false;
 
     ieee80211_sta_get_rates(sdata, ie, sband->band,
                 &basic_rates);
 
     if (sdata->vif.bss_conf.basic_rates != basic_rates)
         return false;
 
     cfg80211_chandef_create(&sta_chan_def, sdata->vif.bss_conf.chandef.chan,
                 NL80211_CHAN_NO_HT);
     ieee80211_chandef_ht_oper(ie->ht_operation, &sta_chan_def);
 
     if (ie->vht_cap_elem)
         vht_cap_info = le32_to_cpu(ie->vht_cap_elem->vht_cap_info);
 
     ieee80211_chandef_vht_oper(&sdata->local->hw, vht_cap_info,
                    ie->vht_operation, ie->ht_operation,
                    &sta_chan_def);
     ieee80211_chandef_he_6ghz_oper(sdata, ie->he_operation, NULL,
                        &sta_chan_def);
 
     if (!cfg80211_chandef_compatible(&sdata->vif.bss_conf.chandef,
                      &sta_chan_def))
         return false;
 
     return true;
 }
 
 /**
  * mesh_peer_accepts_plinks - check if an mp is willing to establish peer links
  *
  * @ie: information elements of a management frame from the mesh peer
  */
 bool mesh_peer_accepts_plinks(struct ieee802_11_elems *ie)
 {
     return (ie->mesh_config->meshconf_cap &
             IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS) != 0;
 }
 
 /**
  * mesh_accept_plinks_update - update accepting_plink in local mesh beacons
  *
  * @sdata: mesh interface in which mesh beacons are going to be updated
  *
  * Returns: beacon changed flag if the beacon content changed.
  */
 u32 mesh_accept_plinks_update(struct ieee80211_sub_if_data *sdata)
 {
     bool free_plinks;
     u32 changed = 0;
 
     /* In case mesh_plink_free_count > 0 and mesh_plinktbl_capacity == 0,
      * the mesh interface might be able to establish plinks with peers that
      * are already on the table but are not on PLINK_ESTAB state. However,
      * in general the mesh interface is not accepting peer link requests
      * from new peers, and that must be reflected in the beacon
      */
     free_plinks = mesh_plink_availables(sdata);
 
     if (free_plinks != sdata->u.mesh.accepting_plinks) {
         sdata->u.mesh.accepting_plinks = free_plinks;
         changed = BSS_CHANGED_BEACON;
     }
 
     return changed;
 }
 
 /*
  * mesh_sta_cleanup - clean up any mesh sta state
  *
  * @sta: mesh sta to clean up.
  */
 void mesh_sta_cleanup(struct sta_info *sta)
 {
     struct ieee80211_sub_if_data *sdata = sta->sdata;
     u32 changed = mesh_plink_deactivate(sta);
 
     if (changed)
         ieee80211_mbss_info_change_notify(sdata, changed);
 }
 
 int mesh_rmc_init(struct ieee80211_sub_if_data *sdata)
 {
     int i;
 
     sdata->u.mesh.rmc = kmalloc(sizeof(struct mesh_rmc), GFP_KERNEL);
     if (!sdata->u.mesh.rmc)
         return -ENOMEM;
     sdata->u.mesh.rmc->idx_mask = RMC_BUCKETS - 1;
     for (i = 0; i < RMC_BUCKETS; i++)
         INIT_HLIST_HEAD(&sdata->u.mesh.rmc->bucket[i]);
     return 0;
 }
 
 void mesh_rmc_free(struct ieee80211_sub_if_data *sdata)
 {
     struct mesh_rmc *rmc = sdata->u.mesh.rmc;
     struct rmc_entry *p;
     struct hlist_node *n;
     int i;
 
     if (!sdata->u.mesh.rmc)
         return;
 
     for (i = 0; i < RMC_BUCKETS; i++) {
         hlist_for_each_entry_safe(p, n, &rmc->bucket[i], list) {
             hlist_del(&p->list);
             kmem_cache_free(rm_cache, p);
         }
     }
 
     kfree(rmc);
     sdata->u.mesh.rmc = NULL;
 }
 
 /**
  * mesh_rmc_check - Check frame in recent multicast cache and add if absent.
  *
  * @sdata:  interface
  * @sa:     source address
  * @mesh_hdr:   mesh_header
  *
  * Returns: 0 if the frame is not in the cache, nonzero otherwise.
  *
  * Checks using the source address and the mesh sequence number if we have
  * received this frame lately. If the frame is not in the cache, it is added to
  * it.
  */
 int mesh_rmc_check(struct ieee80211_sub_if_data *sdata,
            const u8 *sa, struct ieee80211s_hdr *mesh_hdr)
 {
     struct mesh_rmc *rmc = sdata->u.mesh.rmc;
     u32 seqnum = 0;
     int entries = 0;
     u8 idx;
     struct rmc_entry *p;
     struct hlist_node *n;
 
     if (!rmc)
         return -1;
 
     /* Don't care about endianness since only match matters */
     memcpy(&seqnum, &mesh_hdr->seqnum, sizeof(mesh_hdr->seqnum));
     idx = le32_to_cpu(mesh_hdr->seqnum) & rmc->idx_mask;
     hlist_for_each_entry_safe(p, n, &rmc->bucket[idx], list) {
         ++entries;
         if (time_after(jiffies, p->exp_time) ||
             entries == RMC_QUEUE_MAX_LEN) {
             hlist_del(&p->list);
             kmem_cache_free(rm_cache, p);
             --entries;
         } else if ((seqnum == p->seqnum) && ether_addr_equal(sa, p->sa))
             return -1;
     }
 
     p = kmem_cache_alloc(rm_cache, GFP_ATOMIC);
     if (!p)
         return 0;
 
     p->seqnum = seqnum;
     p->exp_time = jiffies + RMC_TIMEOUT;
     memcpy(p->sa, sa, ETH_ALEN);
     hlist_add_head(&p->list, &rmc->bucket[idx]);
     return 0;
 }
 
 int mesh_add_meshconf_ie(struct ieee80211_sub_if_data *sdata,
              struct sk_buff *skb)
 {
     struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
     u8 *pos, neighbors;
     u8 meshconf_len = sizeof(struct ieee80211_meshconf_ie);
     bool is_connected_to_gate = ifmsh->num_gates > 0 ||
         ifmsh->mshcfg.dot11MeshGateAnnouncementProtocol ||
         ifmsh->mshcfg.dot11MeshConnectedToMeshGate;
     bool is_connected_to_as = ifmsh->mshcfg.dot11MeshConnectedToAuthServer;
 
     if (skb_tailroom(skb) < 2 + meshconf_len)
         return -ENOMEM;
 
     pos = skb_put(skb, 2 + meshconf_len);
     *pos++ = WLAN_EID_MESH_CONFIG;
     *pos++ = meshconf_len;
 
     /* save a pointer for quick updates in pre-tbtt */
     ifmsh->meshconf_offset = pos - skb->data;
 
     /* Active path selection protocol ID */
     *pos++ = ifmsh->mesh_pp_id;
     /* Active path selection metric ID   */
     *pos++ = ifmsh->mesh_pm_id;
     /* Congestion control mode identifier */
     *pos++ = ifmsh->mesh_cc_id;
     /* Synchronization protocol identifier */
     *pos++ = ifmsh->mesh_sp_id;
     /* Authentication Protocol identifier */
     *pos++ = ifmsh->mesh_auth_id;
     /* Mesh Formation Info - number of neighbors */
     neighbors = atomic_read(&ifmsh->estab_plinks);
     neighbors = min_t(int, neighbors, IEEE80211_MAX_MESH_PEERINGS);
     *pos++ = (is_connected_to_as << 7) |
          (neighbors << 1) |
          is_connected_to_gate;
     /* Mesh capability */
     *pos = 0x00;
     *pos |= ifmsh->mshcfg.dot11MeshForwarding ?
             IEEE80211_MESHCONF_CAPAB_FORWARDING : 0x00;
     *pos |= ifmsh->accepting_plinks ?
             IEEE80211_MESHCONF_CAPAB_ACCEPT_PLINKS : 0x00;
     /* Mesh PS mode. See IEEE802.11-2012 8.4.2.100.8 */
     *pos |= ifmsh->ps_peers_deep_sleep ?
             IEEE80211_MESHCONF_CAPAB_POWER_SAVE_LEVEL : 0x00;
     return 0;
 }
 
 int mesh_add_meshid_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 {
     struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
     u8 *pos;
 
     if (skb_tailroom(skb) < 2 + ifmsh->mesh_id_len)
         return -ENOMEM;
 
     pos = skb_put(skb, 2 + ifmsh->mesh_id_len);
     *pos++ = WLAN_EID_MESH_ID;
     *pos++ = ifmsh->mesh_id_len;
     if (ifmsh->mesh_id_len)
         memcpy(pos, ifmsh->mesh_id, ifmsh->mesh_id_len);
 
     return 0;
 }
 
 static int mesh_add_awake_window_ie(struct ieee80211_sub_if_data *sdata,
                     struct sk_buff *skb)
 {
     struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
     u8 *pos;
 
     /* see IEEE802.11-2012 13.14.6 */
     if (ifmsh->ps_peers_light_sleep == 0 &&
         ifmsh->ps_peers_deep_sleep == 0 &&
         ifmsh->nonpeer_pm == NL80211_MESH_POWER_ACTIVE)
         return 0;
 
     if (skb_tailroom(skb) < 4)
         return -ENOMEM;
 
     pos = skb_put(skb, 2 + 2);
     *pos++ = WLAN_EID_MESH_AWAKE_WINDOW;
     *pos++ = 2;
     put_unaligned_le16(ifmsh->mshcfg.dot11MeshAwakeWindowDuration, pos);
 
     return 0;
 }
 
 int mesh_add_vendor_ies(struct ieee80211_sub_if_data *sdata,
             struct sk_buff *skb)
 {
     struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
     u8 offset, len;
     const u8 *data;
 
     if (!ifmsh->ie || !ifmsh->ie_len)
         return 0;
 
     /* fast-forward to vendor IEs */
     offset = ieee80211_ie_split_vendor(ifmsh->ie, ifmsh->ie_len, 0);
 
     if (offset < ifmsh->ie_len) {
         len = ifmsh->ie_len - offset;
         data = ifmsh->ie + offset;
         if (skb_tailroom(skb) < len)
             return -ENOMEM;
         skb_put_data(skb, data, len);
     }
 
     return 0;
 }
 
 int mesh_add_rsn_ie(struct ieee80211_sub_if_data *sdata, struct sk_buff *skb)
 {
     struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
     u8 len = 0;
     const u8 *data;
 
     if (!ifmsh->ie || !ifmsh->ie_len)
         return 0;
 
     /* find RSN IE */
     data = cfg80211_find_ie(WLAN_EID_RSN, ifmsh->ie, ifmsh->ie_len);
     if (!data)
         return 0;
 
     len = data[1] + 2;
 
     if (skb_tailroom(skb) < len)
         return -ENOMEM;
     skb_put_data(skb, data, len);
 
     return 0;
 }
 
 static int mesh_add_ds_params_ie(struct ieee80211_sub_if_data *sdata,
                  struct sk_buff *skb)
 {
     struct ieee80211_chanctx_conf *chanctx_conf;
     struct ieee80211_channel *chan;
     u8 *pos;
 
     if (skb_tailroom(skb) < 3)
         return -ENOMEM;
 
     rcu_read_lock();
     chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
     if (WARN_ON(!chanctx_conf)) {
         rcu_read_unlock();
         return -EINVAL;
     }
     chan = chanctx_conf->def.chan;
     rcu_read_unlock();
 
     pos = skb_put(skb, 2 + 1);
     *pos++ = WLAN_EID_DS_PARAMS;
     *pos++ = 1;
     *pos++ = ieee80211_frequency_to_channel(chan->center_freq);
 
     return 0;
 }
 
 int mesh_add_ht_cap_ie(struct ieee80211_sub_if_data *sdata,
                struct sk_buff *skb)
 {
     struct ieee80211_supported_band *sband;
     u8 *pos;
 
     sband = ieee80211_get_sband(sdata);
     if (!sband)
         return -EINVAL;
 
     /* HT not allowed in 6 GHz */
     if (sband->band == NL80211_BAND_6GHZ)
         return 0;
 
     if (!sband->ht_cap.ht_supported ||
         sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
         sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
         sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
         return 0;
 
     if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_cap))
         return -ENOMEM;
 
     pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_cap));
     ieee80211_ie_build_ht_cap(pos, &sband->ht_cap, sband->ht_cap.cap);
 
     return 0;
 }
 
 int mesh_add_ht_oper_ie(struct ieee80211_sub_if_data *sdata,
             struct sk_buff *skb)
 {
     struct ieee80211_local *local = sdata->local;
     struct ieee80211_chanctx_conf *chanctx_conf;
     struct ieee80211_channel *channel;
     struct ieee80211_supported_band *sband;
     struct ieee80211_sta_ht_cap *ht_cap;
     u8 *pos;
 
     rcu_read_lock();
     chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
     if (WARN_ON(!chanctx_conf)) {
         rcu_read_unlock();
         return -EINVAL;
     }
     channel = chanctx_conf->def.chan;
     rcu_read_unlock();
 
     sband = local->hw.wiphy->bands[channel->band];
     ht_cap = &sband->ht_cap;
 
     /* HT not allowed in 6 GHz */
     if (sband->band == NL80211_BAND_6GHZ)
         return 0;
 
     if (!ht_cap->ht_supported ||
         sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
         sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
         sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
         return 0;
 
     if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_ht_operation))
         return -ENOMEM;
 
     pos = skb_put(skb, 2 + sizeof(struct ieee80211_ht_operation));
     ieee80211_ie_build_ht_oper(pos, ht_cap, &sdata->vif.bss_conf.chandef,
                    sdata->vif.bss_conf.ht_operation_mode,
                    false);
 
     return 0;
 }
 
 int mesh_add_vht_cap_ie(struct ieee80211_sub_if_data *sdata,
             struct sk_buff *skb)
 {
     struct ieee80211_supported_band *sband;
     u8 *pos;
 
     sband = ieee80211_get_sband(sdata);
     if (!sband)
         return -EINVAL;
 
     /* VHT not allowed in 6 GHz */
     if (sband->band == NL80211_BAND_6GHZ)
         return 0;
 
     if (!sband->vht_cap.vht_supported ||
         sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
         sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
         sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
         return 0;
 
     if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_cap))
         return -ENOMEM;
 
     pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_cap));
     ieee80211_ie_build_vht_cap(pos, &sband->vht_cap, sband->vht_cap.cap);
 
     return 0;
 }
 
 int mesh_add_vht_oper_ie(struct ieee80211_sub_if_data *sdata,
              struct sk_buff *skb)
 {
     struct ieee80211_local *local = sdata->local;
     struct ieee80211_chanctx_conf *chanctx_conf;
     struct ieee80211_channel *channel;
     struct ieee80211_supported_band *sband;
     struct ieee80211_sta_vht_cap *vht_cap;
     u8 *pos;
 
     rcu_read_lock();
     chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
     if (WARN_ON(!chanctx_conf)) {
         rcu_read_unlock();
         return -EINVAL;
     }
     channel = chanctx_conf->def.chan;
     rcu_read_unlock();
 
     sband = local->hw.wiphy->bands[channel->band];
     vht_cap = &sband->vht_cap;
 
     /* VHT not allowed in 6 GHz */
     if (sband->band == NL80211_BAND_6GHZ)
         return 0;
 
     if (!vht_cap->vht_supported ||
         sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
         sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
         sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
         return 0;
 
     if (skb_tailroom(skb) < 2 + sizeof(struct ieee80211_vht_operation))
         return -ENOMEM;
 
     pos = skb_put(skb, 2 + sizeof(struct ieee80211_vht_operation));
     ieee80211_ie_build_vht_oper(pos, vht_cap,
                     &sdata->vif.bss_conf.chandef);
 
     return 0;
 }
 
 int mesh_add_he_cap_ie(struct ieee80211_sub_if_data *sdata,
                struct sk_buff *skb, u8 ie_len)
 {
     const struct ieee80211_sta_he_cap *he_cap;
     struct ieee80211_supported_band *sband;
     u8 *pos;
 
     sband = ieee80211_get_sband(sdata);
     if (!sband)
         return -EINVAL;
 
     he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
 
     if (!he_cap ||
         sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
         sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
         sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
         return 0;
 
     if (skb_tailroom(skb) < ie_len)
         return -ENOMEM;
 
     pos = skb_put(skb, ie_len);
     ieee80211_ie_build_he_cap(0, pos, he_cap, pos + ie_len);
 
     return 0;
 }
 
 int mesh_add_he_oper_ie(struct ieee80211_sub_if_data *sdata,
             struct sk_buff *skb)
 {
     const struct ieee80211_sta_he_cap *he_cap;
     struct ieee80211_supported_band *sband;
     u32 len;
     u8 *pos;
 
     sband = ieee80211_get_sband(sdata);
     if (!sband)
         return -EINVAL;
 
     he_cap = ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT);
     if (!he_cap ||
         sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
         sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
         sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
         return 0;
 
     len = 2 + 1 + sizeof(struct ieee80211_he_operation);
     if (sdata->vif.bss_conf.chandef.chan->band == NL80211_BAND_6GHZ)
         len += sizeof(struct ieee80211_he_6ghz_oper);
 
     if (skb_tailroom(skb) < len)
         return -ENOMEM;
 
     pos = skb_put(skb, len);
     ieee80211_ie_build_he_oper(pos, &sdata->vif.bss_conf.chandef);
 
     return 0;
 }
 
 int mesh_add_he_6ghz_cap_ie(struct ieee80211_sub_if_data *sdata,
                 struct sk_buff *skb)
 {
     struct ieee80211_supported_band *sband;
     const struct ieee80211_sband_iftype_data *iftd;
 
     sband = ieee80211_get_sband(sdata);
     if (!sband)
         return -EINVAL;
 
     iftd = ieee80211_get_sband_iftype_data(sband,
                            NL80211_IFTYPE_MESH_POINT);
     /* The device doesn't support HE in mesh mode or at all */
     if (!iftd)
         return 0;
 
     ieee80211_ie_build_he_6ghz_cap(sdata, skb);
     return 0;
 }
 
 static void ieee80211_mesh_path_timer(struct timer_list *t)
 {
     struct ieee80211_sub_if_data *sdata =
         from_timer(sdata, t, u.mesh.mesh_path_timer);
 
     ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 }
 
 static void ieee80211_mesh_path_root_timer(struct timer_list *t)
 {
     struct ieee80211_sub_if_data *sdata =
         from_timer(sdata, t, u.mesh.mesh_path_root_timer);
     struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 
     set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
 
     ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 }
 
 void ieee80211_mesh_root_setup(struct ieee80211_if_mesh *ifmsh)
 {
     if (ifmsh->mshcfg.dot11MeshHWMPRootMode > IEEE80211_ROOTMODE_ROOT)
         set_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
     else {
         clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags);
         /* stop running timer */
         del_timer_sync(&ifmsh->mesh_path_root_timer);
     }
 }
 
 static void
 ieee80211_mesh_update_bss_params(struct ieee80211_sub_if_data *sdata,
                  u8 *ie, u8 ie_len)
 {
     struct ieee80211_supported_band *sband;
     const struct element *cap;
     const struct ieee80211_he_operation *he_oper = NULL;
 
     sband = ieee80211_get_sband(sdata);
     if (!sband)
         return;
 
     if (!ieee80211_get_he_iftype_cap(sband, NL80211_IFTYPE_MESH_POINT) ||
         sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_20_NOHT ||
         sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_5 ||
         sdata->vif.bss_conf.chandef.width == NL80211_CHAN_WIDTH_10)
         return;
 
     sdata->vif.bss_conf.he_support = true;
 
     cap = cfg80211_find_ext_elem(WLAN_EID_EXT_HE_OPERATION, ie, ie_len);
     if (cap && cap->datalen >= 1 + sizeof(*he_oper) &&
         cap->datalen >= 1 + ieee80211_he_oper_size(cap->data + 1))
         he_oper = (void *)(cap->data + 1);
 
     if (he_oper)
         sdata->vif.bss_conf.he_oper.params =
             __le32_to_cpu(he_oper->he_oper_params);
 }
 
 /**
  * ieee80211_fill_mesh_addresses - fill addresses of a locally originated mesh frame
  * @hdr:    802.11 frame header
  * @fc:     frame control field
  * @meshda: destination address in the mesh
  * @meshsa: source address in the mesh.  Same as TA, as frame is
  *              locally originated.
  *
  * Return the length of the 802.11 (does not include a mesh control header)
  */
 int ieee80211_fill_mesh_addresses(struct ieee80211_hdr *hdr, __le16 *fc,
                   const u8 *meshda, const u8 *meshsa)
 {
     if (is_multicast_ether_addr(meshda)) {
         *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
         /* DA TA SA */
         memcpy(hdr->addr1, meshda, ETH_ALEN);
         memcpy(hdr->addr2, meshsa, ETH_ALEN);
         memcpy(hdr->addr3, meshsa, ETH_ALEN);
         return 24;
     } else {
         *fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
         /* RA TA DA SA */
         eth_zero_addr(hdr->addr1);   /* RA is resolved later */
         memcpy(hdr->addr2, meshsa, ETH_ALEN);
         memcpy(hdr->addr3, meshda, ETH_ALEN);
         memcpy(hdr->addr4, meshsa, ETH_ALEN);
         return 30;
     }
 }
 
 /**
  * ieee80211_new_mesh_header - create a new mesh header
  * @sdata:  mesh interface to be used
  * @meshhdr:    uninitialized mesh header
  * @addr4or5:   1st address in the ae header, which may correspond to address 4
  *              (if addr6 is NULL) or address 5 (if addr6 is present). It may
  *              be NULL.
  * @addr6:  2nd address in the ae header, which corresponds to addr6 of the
  *              mesh frame
  *
  * Return the header length.
  */
 unsigned int ieee80211_new_mesh_header(struct ieee80211_sub_if_data *sdata,
                        struct ieee80211s_hdr *meshhdr,
                        const char *addr4or5, const char *addr6)
 {
     if (WARN_ON(!addr4or5 && addr6))
         return 0;
 
     memset(meshhdr, 0, sizeof(*meshhdr));
 
     meshhdr->ttl = sdata->u.mesh.mshcfg.dot11MeshTTL;
 
     /* FIXME: racy -- TX on multiple queues can be concurrent */
     put_unaligned(cpu_to_le32(sdata->u.mesh.mesh_seqnum), &meshhdr->seqnum);
     sdata->u.mesh.mesh_seqnum++;
 
     if (addr4or5 && !addr6) {
         meshhdr->flags |= MESH_FLAGS_AE_A4;
         memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
         return 2 * ETH_ALEN;
     } else if (addr4or5 && addr6) {
         meshhdr->flags |= MESH_FLAGS_AE_A5_A6;
         memcpy(meshhdr->eaddr1, addr4or5, ETH_ALEN);
         memcpy(meshhdr->eaddr2, addr6, ETH_ALEN);
         return 3 * ETH_ALEN;
     }
 
     return ETH_ALEN;
 }
 
 static void ieee80211_mesh_housekeeping(struct ieee80211_sub_if_data *sdata)
 {
     struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
     u32 changed;
 
     if (ifmsh->mshcfg.plink_timeout > 0)
         ieee80211_sta_expire(sdata, ifmsh->mshcfg.plink_timeout * HZ);
     mesh_path_expire(sdata);
 
     changed = mesh_accept_plinks_update(sdata);
     ieee80211_mbss_info_change_notify(sdata, changed);
 
     mod_timer(&ifmsh->housekeeping_timer,
           round_jiffies(jiffies +
                 IEEE80211_MESH_HOUSEKEEPING_INTERVAL));
 }
 
 static void ieee80211_mesh_rootpath(struct ieee80211_sub_if_data *sdata)
 {
     struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
     u32 interval;
 
     mesh_path_tx_root_frame(sdata);
 
     if (ifmsh->mshcfg.dot11MeshHWMPRootMode == IEEE80211_PROACTIVE_RANN)
         interval = ifmsh->mshcfg.dot11MeshHWMPRannInterval;
     else
         interval = ifmsh->mshcfg.dot11MeshHWMProotInterval;
 
     mod_timer(&ifmsh->mesh_path_root_timer,
           round_jiffies(TU_TO_EXP_TIME(interval)));
 }
 
 static int
 ieee80211_mesh_build_beacon(struct ieee80211_if_mesh *ifmsh)
 {
     struct beacon_data *bcn;
     int head_len, tail_len;
     struct sk_buff *skb;
     struct ieee80211_mgmt *mgmt;
     struct ieee80211_chanctx_conf *chanctx_conf;
     struct mesh_csa_settings *csa;
     enum nl80211_band band;
     u8 ie_len_he_cap;
     u8 *pos;
     struct ieee80211_sub_if_data *sdata;
     int hdr_len = offsetofend(struct ieee80211_mgmt, u.beacon);
 
     sdata = container_of(ifmsh, struct ieee80211_sub_if_data, u.mesh);
     rcu_read_lock();
     chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
     band = chanctx_conf->def.chan->band;
     rcu_read_unlock();
 
     ie_len_he_cap = ieee80211_ie_len_he_cap(sdata,
                         NL80211_IFTYPE_MESH_POINT);
     head_len = hdr_len +
            2 + /* NULL SSID */
            /* Channel Switch Announcement */
            2 + sizeof(struct ieee80211_channel_sw_ie) +
            /* Mesh Channel Switch Parameters */
            2 + sizeof(struct ieee80211_mesh_chansw_params_ie) +
            /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
            2 + 2 + sizeof(struct ieee80211_wide_bw_chansw_ie) +
            2 + sizeof(struct ieee80211_sec_chan_offs_ie) +
            2 + 8 + /* supported rates */
            2 + 3; /* DS params */
     tail_len = 2 + (IEEE80211_MAX_SUPP_RATES - 8) +
            2 + sizeof(struct ieee80211_ht_cap) +
            2 + sizeof(struct ieee80211_ht_operation) +
            2 + ifmsh->mesh_id_len +
            2 + sizeof(struct ieee80211_meshconf_ie) +
            2 + sizeof(__le16) + /* awake window */
            2 + sizeof(struct ieee80211_vht_cap) +
            2 + sizeof(struct ieee80211_vht_operation) +
            ie_len_he_cap +
            2 + 1 + sizeof(struct ieee80211_he_operation) +
                sizeof(struct ieee80211_he_6ghz_oper) +
            2 + 1 + sizeof(struct ieee80211_he_6ghz_capa) +
            ifmsh->ie_len;
 
     bcn = kzalloc(sizeof(*bcn) + head_len + tail_len, GFP_KERNEL);
     /* need an skb for IE builders to operate on */
     skb = __dev_alloc_skb(max(head_len, tail_len), GFP_KERNEL);
 
     if (!bcn || !skb)
         goto out_free;
 
     /*
      * pointers go into the block we allocated,
      * memory is | beacon_data | head | tail |
      */
     bcn->head = ((u8 *) bcn) + sizeof(*bcn);
 
     /* fill in the head */
     mgmt = skb_put_zero(skb, hdr_len);
     mgmt->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
                       IEEE80211_STYPE_BEACON);
     eth_broadcast_addr(mgmt->da);
     memcpy(mgmt->sa, sdata->vif.addr, ETH_ALEN);
     memcpy(mgmt->bssid, sdata->vif.addr, ETH_ALEN);
     ieee80211_mps_set_frame_flags(sdata, NULL, (void *) mgmt);
     mgmt->u.beacon.beacon_int =
         cpu_to_le16(sdata->vif.bss_conf.beacon_int);
     mgmt->u.beacon.capab_info |= cpu_to_le16(
         sdata->u.mesh.security ? WLAN_CAPABILITY_PRIVACY : 0);
 
     pos = skb_put(skb, 2);
     *pos++ = WLAN_EID_SSID;
     *pos++ = 0x0;
 
     rcu_read_lock();
     csa = rcu_dereference(ifmsh->csa);
     if (csa) {
         enum nl80211_channel_type ct;
         struct cfg80211_chan_def *chandef;
         int ie_len = 2 + sizeof(struct ieee80211_channel_sw_ie) +
                  2 + sizeof(struct ieee80211_mesh_chansw_params_ie);
 
         pos = skb_put_zero(skb, ie_len);
         *pos++ = WLAN_EID_CHANNEL_SWITCH;
         *pos++ = 3;
         *pos++ = 0x0;
         *pos++ = ieee80211_frequency_to_channel(
                 csa->settings.chandef.chan->center_freq);
         bcn->cntdwn_current_counter = csa->settings.count;
         bcn->cntdwn_counter_offsets[0] = hdr_len + 6;
         *pos++ = csa->settings.count;
         *pos++ = WLAN_EID_CHAN_SWITCH_PARAM;
         *pos++ = 6;
         if (ifmsh->csa_role == IEEE80211_MESH_CSA_ROLE_INIT) {
             *pos++ = ifmsh->mshcfg.dot11MeshTTL;
             *pos |= WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
         } else {
             *pos++ = ifmsh->chsw_ttl;
         }
         *pos++ |= csa->settings.block_tx ?
               WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT : 0x00;
         put_unaligned_le16(WLAN_REASON_MESH_CHAN, pos);
         pos += 2;
         put_unaligned_le16(ifmsh->pre_value, pos);
         pos += 2;
 
         switch (csa->settings.chandef.width) {
         case NL80211_CHAN_WIDTH_40:
             ie_len = 2 + sizeof(struct ieee80211_sec_chan_offs_ie);
             pos = skb_put_zero(skb, ie_len);
 
             *pos++ = WLAN_EID_SECONDARY_CHANNEL_OFFSET; /* EID */
             *pos++ = 1;                 /* len */
             ct = cfg80211_get_chandef_type(&csa->settings.chandef);
             if (ct == NL80211_CHAN_HT40PLUS)
                 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_ABOVE;
             else
                 *pos++ = IEEE80211_HT_PARAM_CHA_SEC_BELOW;
             break;
         case NL80211_CHAN_WIDTH_80:
         case NL80211_CHAN_WIDTH_80P80:
         case NL80211_CHAN_WIDTH_160:
             /* Channel Switch Wrapper + Wide Bandwidth CSA IE */
             ie_len = 2 + 2 +
                  sizeof(struct ieee80211_wide_bw_chansw_ie);
             pos = skb_put_zero(skb, ie_len);
 
             *pos++ = WLAN_EID_CHANNEL_SWITCH_WRAPPER; /* EID */
             *pos++ = 5;               /* len */
             /* put sub IE */
             chandef = &csa->settings.chandef;
             ieee80211_ie_build_wide_bw_cs(pos, chandef);
             break;
         default:
             break;
         }
     }
     rcu_read_unlock();
 
     if (ieee80211_add_srates_ie(sdata, skb, true, band) ||
         mesh_add_ds_params_ie(sdata, skb))
         goto out_free;
 
     bcn->head_len = skb->len;
     memcpy(bcn->head, skb->data, bcn->head_len);
 
     /* now the tail */
     skb_trim(skb, 0);
     bcn->tail = bcn->head + bcn->head_len;
 
     if (ieee80211_add_ext_srates_ie(sdata, skb, true, band) ||
         mesh_add_rsn_ie(sdata, skb) ||
         mesh_add_ht_cap_ie(sdata, skb) ||
         mesh_add_ht_oper_ie(sdata, skb) ||
         mesh_add_meshid_ie(sdata, skb) ||
         mesh_add_meshconf_ie(sdata, skb) ||
         mesh_add_awake_window_ie(sdata, skb) ||
         mesh_add_vht_cap_ie(sdata, skb) ||
         mesh_add_vht_oper_ie(sdata, skb) ||
         mesh_add_he_cap_ie(sdata, skb, ie_len_he_cap) ||
         mesh_add_he_oper_ie(sdata, skb) ||
         mesh_add_he_6ghz_cap_ie(sdata, skb) ||
         mesh_add_vendor_ies(sdata, skb))
         goto out_free;
 
     bcn->tail_len = skb->len;
     memcpy(bcn->tail, skb->data, bcn->tail_len);
     ieee80211_mesh_update_bss_params(sdata, bcn->tail, bcn->tail_len);
     bcn->meshconf = (struct ieee80211_meshconf_ie *)
                     (bcn->tail + ifmsh->meshconf_offset);
 
     dev_kfree_skb(skb);
     rcu_assign_pointer(ifmsh->beacon, bcn);
     return 0;
 out_free:
     kfree(bcn);
     dev_kfree_skb(skb);
     return -ENOMEM;
 }
 
 static int
 ieee80211_mesh_rebuild_beacon(struct ieee80211_sub_if_data *sdata)
 {
     struct beacon_data *old_bcn;
     int ret;
 
     old_bcn = sdata_dereference(sdata->u.mesh.beacon, sdata);
     ret = ieee80211_mesh_build_beacon(&sdata->u.mesh);
     if (ret)
         /* just reuse old beacon */
         return ret;
 
     if (old_bcn)
         kfree_rcu(old_bcn, rcu_head);
     return 0;
 }
 
 void ieee80211_mbss_info_change_notify(struct ieee80211_sub_if_data *sdata,
                        u32 changed)
 {
     struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
     unsigned long bits = changed;
     u32 bit;
 
     if (!bits)
         return;
 
     /* if we race with running work, worst case this work becomes a noop */
     for_each_set_bit(bit, &bits, sizeof(changed) * BITS_PER_BYTE)
         set_bit(bit, &ifmsh->mbss_changed);
     set_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags);
     ieee80211_queue_work(&sdata->local->hw, &sdata->work);
 }
 
 int ieee80211_start_mesh(struct ieee80211_sub_if_data *sdata)
 {
     struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
     struct ieee80211_local *local = sdata->local;
     u32 changed = BSS_CHANGED_BEACON |
               BSS_CHANGED_BEACON_ENABLED |
               BSS_CHANGED_HT |
               BSS_CHANGED_BASIC_RATES |
               BSS_CHANGED_BEACON_INT |
               BSS_CHANGED_MCAST_RATE;
 
     local->fif_other_bss++;
     /* mesh ifaces must set allmulti to forward mcast traffic */
     atomic_inc(&local->iff_allmultis);
     ieee80211_configure_filter(local);
 
     ifmsh->mesh_cc_id = 0;  /* Disabled */
     /* register sync ops from extensible synchronization framework */
     ifmsh->sync_ops = ieee80211_mesh_sync_ops_get(ifmsh->mesh_sp_id);
     ifmsh->sync_offset_clockdrift_max = 0;
     set_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags);
     ieee80211_mesh_root_setup(ifmsh);
     ieee80211_queue_work(&local->hw, &sdata->work);
     sdata->vif.bss_conf.ht_operation_mode =
                 ifmsh->mshcfg.ht_opmode;
     sdata->vif.bss_conf.enable_beacon = true;
 
     changed |= ieee80211_mps_local_status_update(sdata);
 
     if (ieee80211_mesh_build_beacon(ifmsh)) {
         ieee80211_stop_mesh(sdata);
         return -ENOMEM;
     }
 
     ieee80211_recalc_dtim(local, sdata);
     ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed);
 
     netif_carrier_on(sdata->dev);
     return 0;
 }
 
 void ieee80211_stop_mesh(struct ieee80211_sub_if_data *sdata)
 {
     struct ieee80211_local *local = sdata->local;
     struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
     struct beacon_data *bcn;
 
     netif_carrier_off(sdata->dev);
 
     /* flush STAs and mpaths on this iface */
     sta_info_flush(sdata);
     ieee80211_free_keys(sdata, true);
     mesh_path_flush_by_iface(sdata);
 
     /* stop the beacon */
     ifmsh->mesh_id_len = 0;
     sdata->vif.bss_conf.enable_beacon = false;
     sdata->beacon_rate_set = false;
     clear_bit(SDATA_STATE_OFFCHANNEL_BEACON_STOPPED, &sdata->state);
     ieee80211_link_info_change_notify(sdata, &sdata->deflink,
                       BSS_CHANGED_BEACON_ENABLED);
 
     /* remove beacon */
     bcn = sdata_dereference(ifmsh->beacon, sdata);
     RCU_INIT_POINTER(ifmsh->beacon, NULL);
     kfree_rcu(bcn, rcu_head);
 
     /* free all potentially still buffered group-addressed frames */
     local->total_ps_buffered -= skb_queue_len(&ifmsh->ps.bc_buf);
     skb_queue_purge(&ifmsh->ps.bc_buf);
 
     del_timer_sync(&sdata->u.mesh.housekeeping_timer);
     del_timer_sync(&sdata->u.mesh.mesh_path_root_timer);
     del_timer_sync(&sdata->u.mesh.mesh_path_timer);
 
     /* clear any mesh work (for next join) we may have accrued */
     ifmsh->wrkq_flags = 0;
     ifmsh->mbss_changed = 0;
 
     local->fif_other_bss--;
     atomic_dec(&local->iff_allmultis);
     ieee80211_configure_filter(local);
 }
 
 static void ieee80211_mesh_csa_mark_radar(struct ieee80211_sub_if_data *sdata)
 {
     int err;
 
     /* if the current channel is a DFS channel, mark the channel as
      * unavailable.
      */
     err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
                         &sdata->vif.bss_conf.chandef,
                         NL80211_IFTYPE_MESH_POINT);
     if (err > 0)
         cfg80211_radar_event(sdata->local->hw.wiphy,
                      &sdata->vif.bss_conf.chandef, GFP_ATOMIC);
 }
 
 static bool
 ieee80211_mesh_process_chnswitch(struct ieee80211_sub_if_data *sdata,
                  struct ieee802_11_elems *elems, bool beacon)
 {
     struct cfg80211_csa_settings params;
     struct ieee80211_csa_ie csa_ie;
     struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
     struct ieee80211_supported_band *sband;
     int err;
     ieee80211_conn_flags_t conn_flags = 0;
     u32 vht_cap_info = 0;
 
     sdata_assert_lock(sdata);
 
     sband = ieee80211_get_sband(sdata);
     if (!sband)
         return false;
 
     switch (sdata->vif.bss_conf.chandef.width) {
     case NL80211_CHAN_WIDTH_20_NOHT:
         conn_flags |= IEEE80211_CONN_DISABLE_HT;
         fallthrough;
     case NL80211_CHAN_WIDTH_20:
         conn_flags |= IEEE80211_CONN_DISABLE_40MHZ;
         fallthrough;
     case NL80211_CHAN_WIDTH_40:
         conn_flags |= IEEE80211_CONN_DISABLE_VHT;
         break;
     default:
         break;
     }
 
     if (elems->vht_cap_elem)
         vht_cap_info =
             le32_to_cpu(elems->vht_cap_elem->vht_cap_info);
 
     memset(&params, 0, sizeof(params));
     err = ieee80211_parse_ch_switch_ie(sdata, elems, sband->band,
                        vht_cap_info,
                        conn_flags, sdata->vif.addr,
                        &csa_ie);
     if (err < 0)
         return false;
     if (err)
         return false;
 
     /* Mark the channel unavailable if the reason for the switch is
      * regulatory.
      */
     if (csa_ie.reason_code == WLAN_REASON_MESH_CHAN_REGULATORY)
         ieee80211_mesh_csa_mark_radar(sdata);
 
     params.chandef = csa_ie.chandef;
     params.count = csa_ie.count;
 
     if (!cfg80211_chandef_usable(sdata->local->hw.wiphy, &params.chandef,
                      IEEE80211_CHAN_DISABLED) ||
         !cfg80211_reg_can_beacon(sdata->local->hw.wiphy, &params.chandef,
                      NL80211_IFTYPE_MESH_POINT)) {
         sdata_info(sdata,
                "mesh STA %pM switches to unsupported channel (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
                sdata->vif.addr,
                params.chandef.chan->center_freq,
                params.chandef.width,
                params.chandef.center_freq1,
                params.chandef.center_freq2);
         return false;
     }
 
     err = cfg80211_chandef_dfs_required(sdata->local->hw.wiphy,
                         &params.chandef,
                         NL80211_IFTYPE_MESH_POINT);
     if (err < 0)
         return false;
     if (err > 0 && !ifmsh->userspace_handles_dfs) {
         sdata_info(sdata,
                "mesh STA %pM switches to channel requiring DFS (%d MHz, width:%d, CF1/2: %d/%d MHz), aborting\n",
                sdata->vif.addr,
                params.chandef.chan->center_freq,
                params.chandef.width,
                params.chandef.center_freq1,
                params.chandef.center_freq2);
         return false;
     }
 
     params.radar_required = err;
 
     if (cfg80211_chandef_identical(&params.chandef,
                        &sdata->vif.bss_conf.chandef)) {
         mcsa_dbg(sdata,
              "received csa with an identical chandef, ignoring\n");
         return true;
     }
 
     mcsa_dbg(sdata,
          "received channel switch announcement to go to channel %d MHz\n",
          params.chandef.chan->center_freq);
 
     params.block_tx = csa_ie.mode & WLAN_EID_CHAN_SWITCH_PARAM_TX_RESTRICT;
     if (beacon) {
         ifmsh->chsw_ttl = csa_ie.ttl - 1;
         if (ifmsh->pre_value >= csa_ie.pre_value)
             return false;
         ifmsh->pre_value = csa_ie.pre_value;
     }
 
     if (ifmsh->chsw_ttl >= ifmsh->mshcfg.dot11MeshTTL)
         return false;
 
     ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_REPEATER;
 
     if (ieee80211_channel_switch(sdata->local->hw.wiphy, sdata->dev,
                      &params) < 0)
         return false;
 
     return true;
 }
 
 static void
 ieee80211_mesh_rx_probe_req(struct ieee80211_sub_if_data *sdata,
                 struct ieee80211_mgmt *mgmt, size_t len)
 {
     struct ieee80211_local *local = sdata->local;
     struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
     struct sk_buff *presp;
     struct beacon_data *bcn;
     struct ieee80211_mgmt *hdr;
     struct ieee802_11_elems *elems;
     size_t baselen;
     u8 *pos;
 
     pos = mgmt->u.probe_req.variable;
     baselen = (u8 *) pos - (u8 *) mgmt;
     if (baselen > len)
         return;
 
     elems = ieee802_11_parse_elems(pos, len - baselen, false, NULL);
     if (!elems)
         return;
 
     if (!elems->mesh_id)
         goto free;
 
     /* 802.11-2012 10.1.4.3.2 */
     if ((!ether_addr_equal(mgmt->da, sdata->vif.addr) &&
          !is_broadcast_ether_addr(mgmt->da)) ||
         elems->ssid_len != 0)
         goto free;
 
     if (elems->mesh_id_len != 0 &&
         (elems->mesh_id_len != ifmsh->mesh_id_len ||
          memcmp(elems->mesh_id, ifmsh->mesh_id, ifmsh->mesh_id_len)))
         goto free;
 
     rcu_read_lock();
     bcn = rcu_dereference(ifmsh->beacon);
 
     if (!bcn)
         goto out;
 
     presp = dev_alloc_skb(local->tx_headroom +
                   bcn->head_len + bcn->tail_len);
     if (!presp)
         goto out;
 
     skb_reserve(presp, local->tx_headroom);
     skb_put_data(presp, bcn->head, bcn->head_len);
     skb_put_data(presp, bcn->tail, bcn->tail_len);
     hdr = (struct ieee80211_mgmt *) presp->data;
     hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
                      IEEE80211_STYPE_PROBE_RESP);
     memcpy(hdr->da, mgmt->sa, ETH_ALEN);
     IEEE80211_SKB_CB(presp)->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
     ieee80211_tx_skb(sdata, presp);
 out:
     rcu_read_unlock();
 free:
     kfree(elems);
 }
 
 static void ieee80211_mesh_rx_bcn_presp(struct ieee80211_sub_if_data *sdata,
                     u16 stype,
                     struct ieee80211_mgmt *mgmt,
                     size_t len,
                     struct ieee80211_rx_status *rx_status)
 {
     struct ieee80211_local *local = sdata->local;
     struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
     struct ieee802_11_elems *elems;
     struct ieee80211_channel *channel;
     size_t baselen;
     int freq;
     enum nl80211_band band = rx_status->band;
 
     /* ignore ProbeResp to foreign address */
     if (stype == IEEE80211_STYPE_PROBE_RESP &&
         !ether_addr_equal(mgmt->da, sdata->vif.addr))
         return;
 
     baselen = (u8 *) mgmt->u.probe_resp.variable - (u8 *) mgmt;
     if (baselen > len)
         return;
 
     elems = ieee802_11_parse_elems(mgmt->u.probe_resp.variable,
                        len - baselen,
                        false, NULL);
     if (!elems)
         return;
 
     /* ignore non-mesh or secure / unsecure mismatch */
     if ((!elems->mesh_id || !elems->mesh_config) ||
         (elems->rsn && sdata->u.mesh.security == IEEE80211_MESH_SEC_NONE) ||
         (!elems->rsn && sdata->u.mesh.security != IEEE80211_MESH_SEC_NONE))
         goto free;
 
     if (elems->ds_params)
         freq = ieee80211_channel_to_frequency(elems->ds_params[0], band);
     else
         freq = rx_status->freq;
 
     channel = ieee80211_get_channel(local->hw.wiphy, freq);
 
     if (!channel || channel->flags & IEEE80211_CHAN_DISABLED)
         goto free;
 
     if (mesh_matches_local(sdata, elems)) {
         mpl_dbg(sdata, "rssi_threshold=%d,rx_status->signal=%d\n",
             sdata->u.mesh.mshcfg.rssi_threshold, rx_status->signal);
         if (!sdata->u.mesh.user_mpm ||
             sdata->u.mesh.mshcfg.rssi_threshold == 0 ||
             sdata->u.mesh.mshcfg.rssi_threshold < rx_status->signal)
             mesh_neighbour_update(sdata, mgmt->sa, elems,
                           rx_status);
 
         if (ifmsh->csa_role != IEEE80211_MESH_CSA_ROLE_INIT &&
             !sdata->vif.bss_conf.csa_active)
             ieee80211_mesh_process_chnswitch(sdata, elems, true);
     }
 
     if (ifmsh->sync_ops)
         ifmsh->sync_ops->rx_bcn_presp(sdata, stype, mgmt, len,
                           elems->mesh_config, rx_status);
 free:
     kfree(elems);
 }
 
 int ieee80211_mesh_finish_csa(struct ieee80211_sub_if_data *sdata)
 {
     struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
     struct mesh_csa_settings *tmp_csa_settings;
     int ret = 0;
     int changed = 0;
 
     /* Reset the TTL value and Initiator flag */
     ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
     ifmsh->chsw_ttl = 0;
 
     /* Remove the CSA and MCSP elements from the beacon */
     tmp_csa_settings = sdata_dereference(ifmsh->csa, sdata);
     RCU_INIT_POINTER(ifmsh->csa, NULL);
     if (tmp_csa_settings)
         kfree_rcu(tmp_csa_settings, rcu_head);
     ret = ieee80211_mesh_rebuild_beacon(sdata);
     if (ret)
         return -EINVAL;
 
     changed |= BSS_CHANGED_BEACON;
 
     mcsa_dbg(sdata, "complete switching to center freq %d MHz",
          sdata->vif.bss_conf.chandef.chan->center_freq);
     return changed;
 }
 
 int ieee80211_mesh_csa_beacon(struct ieee80211_sub_if_data *sdata,
                   struct cfg80211_csa_settings *csa_settings)
 {
     struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
     struct mesh_csa_settings *tmp_csa_settings;
     int ret = 0;
 
     lockdep_assert_held(&sdata->wdev.mtx);
 
     tmp_csa_settings = kmalloc(sizeof(*tmp_csa_settings),
                    GFP_ATOMIC);
     if (!tmp_csa_settings)
         return -ENOMEM;
 
     memcpy(&tmp_csa_settings->settings, csa_settings,
            sizeof(struct cfg80211_csa_settings));
 
     rcu_assign_pointer(ifmsh->csa, tmp_csa_settings);
 
     ret = ieee80211_mesh_rebuild_beacon(sdata);
     if (ret) {
         tmp_csa_settings = rcu_dereference(ifmsh->csa);
         RCU_INIT_POINTER(ifmsh->csa, NULL);
         kfree_rcu(tmp_csa_settings, rcu_head);
         return ret;
     }
 
     return BSS_CHANGED_BEACON;
 }
 
 static int mesh_fwd_csa_frame(struct ieee80211_sub_if_data *sdata,
                    struct ieee80211_mgmt *mgmt, size_t len,
                    struct ieee802_11_elems *elems)
 {
     struct ieee80211_mgmt *mgmt_fwd;
     struct sk_buff *skb;
     struct ieee80211_local *local = sdata->local;
 
     skb = dev_alloc_skb(local->tx_headroom + len);
     if (!skb)
         return -ENOMEM;
     skb_reserve(skb, local->tx_headroom);
     mgmt_fwd = skb_put(skb, len);
 
     elems->mesh_chansw_params_ie->mesh_ttl--;
     elems->mesh_chansw_params_ie->mesh_flags &=
         ~WLAN_EID_CHAN_SWITCH_PARAM_INITIATOR;
 
     memcpy(mgmt_fwd, mgmt, len);
     eth_broadcast_addr(mgmt_fwd->da);
     memcpy(mgmt_fwd->sa, sdata->vif.addr, ETH_ALEN);
     memcpy(mgmt_fwd->bssid, sdata->vif.addr, ETH_ALEN);
 
     ieee80211_tx_skb(sdata, skb);
     return 0;
 }
 
 static void mesh_rx_csa_frame(struct ieee80211_sub_if_data *sdata,
                   struct ieee80211_mgmt *mgmt, size_t len)
 {
     struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
     struct ieee802_11_elems *elems;
     u16 pre_value;
     bool fwd_csa = true;
     size_t baselen;
     u8 *pos;
 
     if (mgmt->u.action.u.measurement.action_code !=
         WLAN_ACTION_SPCT_CHL_SWITCH)
         return;
 
     pos = mgmt->u.action.u.chan_switch.variable;
     baselen = offsetof(struct ieee80211_mgmt,
                u.action.u.chan_switch.variable);
     elems = ieee802_11_parse_elems(pos, len - baselen, true, NULL);
     if (!elems)
         return;
 
     if (!mesh_matches_local(sdata, elems))
         goto free;
 
     ifmsh->chsw_ttl = elems->mesh_chansw_params_ie->mesh_ttl;
     if (!--ifmsh->chsw_ttl)
         fwd_csa = false;
 
     pre_value = le16_to_cpu(elems->mesh_chansw_params_ie->mesh_pre_value);
     if (ifmsh->pre_value >= pre_value)
         goto free;
 
     ifmsh->pre_value = pre_value;
 
     if (!sdata->vif.bss_conf.csa_active &&
         !ieee80211_mesh_process_chnswitch(sdata, elems, false)) {
         mcsa_dbg(sdata, "Failed to process CSA action frame");
         goto free;
     }
 
     /* forward or re-broadcast the CSA frame */
     if (fwd_csa) {
         if (mesh_fwd_csa_frame(sdata, mgmt, len, elems) < 0)
             mcsa_dbg(sdata, "Failed to forward the CSA frame");
     }
 free:
     kfree(elems);
 }
 
 static void ieee80211_mesh_rx_mgmt_action(struct ieee80211_sub_if_data *sdata,
                       struct ieee80211_mgmt *mgmt,
                       size_t len,
                       struct ieee80211_rx_status *rx_status)
 {
     switch (mgmt->u.action.category) {
     case WLAN_CATEGORY_SELF_PROTECTED:
         switch (mgmt->u.action.u.self_prot.action_code) {
         case WLAN_SP_MESH_PEERING_OPEN:
         case WLAN_SP_MESH_PEERING_CLOSE:
         case WLAN_SP_MESH_PEERING_CONFIRM:
             mesh_rx_plink_frame(sdata, mgmt, len, rx_status);
             break;
         }
         break;
     case WLAN_CATEGORY_MESH_ACTION:
         if (mesh_action_is_path_sel(mgmt))
             mesh_rx_path_sel_frame(sdata, mgmt, len);
         break;
     case WLAN_CATEGORY_SPECTRUM_MGMT:
         mesh_rx_csa_frame(sdata, mgmt, len);
         break;
     }
 }
 
 void ieee80211_mesh_rx_queued_mgmt(struct ieee80211_sub_if_data *sdata,
                    struct sk_buff *skb)
 {
     struct ieee80211_rx_status *rx_status;
     struct ieee80211_mgmt *mgmt;
     u16 stype;
 
     sdata_lock(sdata);
 
     /* mesh already went down */
     if (!sdata->u.mesh.mesh_id_len)
         goto out;
 
     rx_status = IEEE80211_SKB_RXCB(skb);
     mgmt = (struct ieee80211_mgmt *) skb->data;
     stype = le16_to_cpu(mgmt->frame_control) & IEEE80211_FCTL_STYPE;
 
     switch (stype) {
     case IEEE80211_STYPE_PROBE_RESP:
     case IEEE80211_STYPE_BEACON:
         ieee80211_mesh_rx_bcn_presp(sdata, stype, mgmt, skb->len,
                         rx_status);
         break;
     case IEEE80211_STYPE_PROBE_REQ:
         ieee80211_mesh_rx_probe_req(sdata, mgmt, skb->len);
         break;
     case IEEE80211_STYPE_ACTION:
         ieee80211_mesh_rx_mgmt_action(sdata, mgmt, skb->len, rx_status);
         break;
     }
 out:
     sdata_unlock(sdata);
 }
 
 static void mesh_bss_info_changed(struct ieee80211_sub_if_data *sdata)
 {
     struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
     u32 bit, changed = 0;
 
     for_each_set_bit(bit, &ifmsh->mbss_changed,
              sizeof(changed) * BITS_PER_BYTE) {
         clear_bit(bit, &ifmsh->mbss_changed);
         changed |= BIT(bit);
     }
 
     if (sdata->vif.bss_conf.enable_beacon &&
         (changed & (BSS_CHANGED_BEACON |
             BSS_CHANGED_HT |
             BSS_CHANGED_BASIC_RATES |
             BSS_CHANGED_BEACON_INT)))
         if (ieee80211_mesh_rebuild_beacon(sdata))
             return;
 
     ieee80211_link_info_change_notify(sdata, &sdata->deflink, changed);
 }
 
 void ieee80211_mesh_work(struct ieee80211_sub_if_data *sdata)
 {
     struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 
     sdata_lock(sdata);
 
     /* mesh already went down */
     if (!sdata->u.mesh.mesh_id_len)
         goto out;
 
     if (ifmsh->preq_queue_len &&
         time_after(jiffies,
                ifmsh->last_preq + msecs_to_jiffies(ifmsh->mshcfg.dot11MeshHWMPpreqMinInterval)))
         mesh_path_start_discovery(sdata);
 
     if (test_and_clear_bit(MESH_WORK_HOUSEKEEPING, &ifmsh->wrkq_flags))
         ieee80211_mesh_housekeeping(sdata);
 
     if (test_and_clear_bit(MESH_WORK_ROOT, &ifmsh->wrkq_flags))
         ieee80211_mesh_rootpath(sdata);
 
     if (test_and_clear_bit(MESH_WORK_DRIFT_ADJUST, &ifmsh->wrkq_flags))
         mesh_sync_adjust_tsf(sdata);
 
     if (test_and_clear_bit(MESH_WORK_MBSS_CHANGED, &ifmsh->wrkq_flags))
         mesh_bss_info_changed(sdata);
 out:
     sdata_unlock(sdata);
 }
 
 
 void ieee80211_mesh_init_sdata(struct ieee80211_sub_if_data *sdata)
 {
     struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
     static u8 zero_addr[ETH_ALEN] = {};
 
     timer_setup(&ifmsh->housekeeping_timer,
             ieee80211_mesh_housekeeping_timer, 0);
 
     ifmsh->accepting_plinks = true;
     atomic_set(&ifmsh->mpaths, 0);
     mesh_rmc_init(sdata);
     ifmsh->last_preq = jiffies;
     ifmsh->next_perr = jiffies;
     ifmsh->csa_role = IEEE80211_MESH_CSA_ROLE_NONE;
     /* Allocate all mesh structures when creating the first mesh interface. */
     if (!mesh_allocated)
         ieee80211s_init();
 
     mesh_pathtbl_init(sdata);
 
     timer_setup(&ifmsh->mesh_path_timer, ieee80211_mesh_path_timer, 0);
     timer_setup(&ifmsh->mesh_path_root_timer,
             ieee80211_mesh_path_root_timer, 0);
     INIT_LIST_HEAD(&ifmsh->preq_queue.list);
     skb_queue_head_init(&ifmsh->ps.bc_buf);
     spin_lock_init(&ifmsh->mesh_preq_queue_lock);
     spin_lock_init(&ifmsh->sync_offset_lock);
     RCU_INIT_POINTER(ifmsh->beacon, NULL);
 
     sdata->vif.bss_conf.bssid = zero_addr;
 }
 
 void ieee80211_mesh_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 {
     mesh_rmc_free(sdata);
     mesh_pathtbl_unregister(sdata);
 }

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