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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 2002-2005, Instant802 Networks, Inc.
  * Copyright 2005-2006, Devicescape Software, Inc.
  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
  * Copyright 2007   Johannes Berg <johannes@sipsolutions.net>
  * Copyright 2013-2014  Intel Mobile Communications GmbH
  * Copyright (C) 2018-2022 Intel Corporation
  *
  * Transmit and frame generation functions.
  */
 
 #include <linux/kernel.h>
 #include <linux/slab.h>
 #include <linux/skbuff.h>
 #include <linux/if_vlan.h>
 #include <linux/etherdevice.h>
 #include <linux/bitmap.h>
 #include <linux/rcupdate.h>
 #include <linux/export.h>
 #include <net/net_namespace.h>
 #include <net/ieee80211_radiotap.h>
 #include <net/cfg80211.h>
 #include <net/mac80211.h>
 #include <net/codel.h>
 #include <net/codel_impl.h>
 #include <asm/unaligned.h>
 #include <net/fq_impl.h>
 
 #include "ieee80211_i.h"
 #include "driver-ops.h"
 #include "led.h"
 #include "mesh.h"
 #include "wep.h"
 #include "wpa.h"
 #include "wme.h"
 #include "rate.h"
 
 /* misc utils */
 
 static __le16 ieee80211_duration(struct ieee80211_tx_data *tx,
                  struct sk_buff *skb, int group_addr,
                  int next_frag_len)
 {
     int rate, mrate, erp, dur, i, shift = 0;
     struct ieee80211_rate *txrate;
     struct ieee80211_local *local = tx->local;
     struct ieee80211_supported_band *sband;
     struct ieee80211_hdr *hdr;
     struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
     struct ieee80211_chanctx_conf *chanctx_conf;
     u32 rate_flags = 0;
 
     /* assume HW handles this */
     if (tx->rate.flags & (IEEE80211_TX_RC_MCS | IEEE80211_TX_RC_VHT_MCS))
         return 0;
 
     rcu_read_lock();
     chanctx_conf = rcu_dereference(tx->sdata->vif.bss_conf.chanctx_conf);
     if (chanctx_conf) {
         shift = ieee80211_chandef_get_shift(&chanctx_conf->def);
         rate_flags = ieee80211_chandef_rate_flags(&chanctx_conf->def);
     }
     rcu_read_unlock();
 
     /* uh huh? */
     if (WARN_ON_ONCE(tx->rate.idx < 0))
         return 0;
 
     sband = local->hw.wiphy->bands[info->band];
     txrate = &sband->bitrates[tx->rate.idx];
 
     erp = txrate->flags & IEEE80211_RATE_ERP_G;
 
     /* device is expected to do this */
     if (sband->band == NL80211_BAND_S1GHZ)
         return 0;
 
     /*
      * data and mgmt (except PS Poll):
      * - during CFP: 32768
      * - during contention period:
      *   if addr1 is group address: 0
      *   if more fragments = 0 and addr1 is individual address: time to
      *      transmit one ACK plus SIFS
      *   if more fragments = 1 and addr1 is individual address: time to
      *      transmit next fragment plus 2 x ACK plus 3 x SIFS
      *
      * IEEE 802.11, 9.6:
      * - control response frame (CTS or ACK) shall be transmitted using the
      *   same rate as the immediately previous frame in the frame exchange
      *   sequence, if this rate belongs to the PHY mandatory rates, or else
      *   at the highest possible rate belonging to the PHY rates in the
      *   BSSBasicRateSet
      */
     hdr = (struct ieee80211_hdr *)skb->data;
     if (ieee80211_is_ctl(hdr->frame_control)) {
         /* TODO: These control frames are not currently sent by
          * mac80211, but should they be implemented, this function
          * needs to be updated to support duration field calculation.
          *
          * RTS: time needed to transmit pending data/mgmt frame plus
          *    one CTS frame plus one ACK frame plus 3 x SIFS
          * CTS: duration of immediately previous RTS minus time
          *    required to transmit CTS and its SIFS
          * ACK: 0 if immediately previous directed data/mgmt had
          *    more=0, with more=1 duration in ACK frame is duration
          *    from previous frame minus time needed to transmit ACK
          *    and its SIFS
          * PS Poll: BIT(15) | BIT(14) | aid
          */
         return 0;
     }
 
     /* data/mgmt */
     if (0 /* FIX: data/mgmt during CFP */)
         return cpu_to_le16(32768);
 
     if (group_addr) /* Group address as the destination - no ACK */
         return 0;
 
     /* Individual destination address:
      * IEEE 802.11, Ch. 9.6 (after IEEE 802.11g changes)
      * CTS and ACK frames shall be transmitted using the highest rate in
      * basic rate set that is less than or equal to the rate of the
      * immediately previous frame and that is using the same modulation
      * (CCK or OFDM). If no basic rate set matches with these requirements,
      * the highest mandatory rate of the PHY that is less than or equal to
      * the rate of the previous frame is used.
      * Mandatory rates for IEEE 802.11g PHY: 1, 2, 5.5, 11, 6, 12, 24 Mbps
      */
     rate = -1;
     /* use lowest available if everything fails */
     mrate = sband->bitrates[0].bitrate;
     for (i = 0; i < sband->n_bitrates; i++) {
         struct ieee80211_rate *r = &sband->bitrates[i];
 
         if (r->bitrate > txrate->bitrate)
             break;
 
         if ((rate_flags & r->flags) != rate_flags)
             continue;
 
         if (tx->sdata->vif.bss_conf.basic_rates & BIT(i))
             rate = DIV_ROUND_UP(r->bitrate, 1 << shift);
 
         switch (sband->band) {
         case NL80211_BAND_2GHZ:
         case NL80211_BAND_LC: {
             u32 flag;
             if (tx->sdata->deflink.operating_11g_mode)
                 flag = IEEE80211_RATE_MANDATORY_G;
             else
                 flag = IEEE80211_RATE_MANDATORY_B;
             if (r->flags & flag)
                 mrate = r->bitrate;
             break;
         }
         case NL80211_BAND_5GHZ:
         case NL80211_BAND_6GHZ:
             if (r->flags & IEEE80211_RATE_MANDATORY_A)
                 mrate = r->bitrate;
             break;
         case NL80211_BAND_S1GHZ:
         case NL80211_BAND_60GHZ:
             /* TODO, for now fall through */
         case NUM_NL80211_BANDS:
             WARN_ON(1);
             break;
         }
     }
     if (rate == -1) {
         /* No matching basic rate found; use highest suitable mandatory
          * PHY rate */
         rate = DIV_ROUND_UP(mrate, 1 << shift);
     }
 
     /* Don't calculate ACKs for QoS Frames with NoAck Policy set */
     if (ieee80211_is_data_qos(hdr->frame_control) &&
         *(ieee80211_get_qos_ctl(hdr)) & IEEE80211_QOS_CTL_ACK_POLICY_NOACK)
         dur = 0;
     else
         /* Time needed to transmit ACK
          * (10 bytes + 4-byte FCS = 112 bits) plus SIFS; rounded up
          * to closest integer */
         dur = ieee80211_frame_duration(sband->band, 10, rate, erp,
                 tx->sdata->vif.bss_conf.use_short_preamble,
                 shift);
 
     if (next_frag_len) {
         /* Frame is fragmented: duration increases with time needed to
          * transmit next fragment plus ACK and 2 x SIFS. */
         dur *= 2; /* ACK + SIFS */
         /* next fragment */
         dur += ieee80211_frame_duration(sband->band, next_frag_len,
                 txrate->bitrate, erp,
                 tx->sdata->vif.bss_conf.use_short_preamble,
                 shift);
     }
 
     return cpu_to_le16(dur);
 }
 
 /* tx handlers */
 static ieee80211_tx_result debug_noinline
 ieee80211_tx_h_dynamic_ps(struct ieee80211_tx_data *tx)
 {
     struct ieee80211_local *local = tx->local;
     struct ieee80211_if_managed *ifmgd;
     struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
 
     /* driver doesn't support power save */
     if (!ieee80211_hw_check(&local->hw, SUPPORTS_PS))
         return TX_CONTINUE;
 
     /* hardware does dynamic power save */
     if (ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS))
         return TX_CONTINUE;
 
     /* dynamic power save disabled */
     if (local->hw.conf.dynamic_ps_timeout <= 0)
         return TX_CONTINUE;
 
     /* we are scanning, don't enable power save */
     if (local->scanning)
         return TX_CONTINUE;
 
     if (!local->ps_sdata)
         return TX_CONTINUE;
 
     /* No point if we're going to suspend */
     if (local->quiescing)
         return TX_CONTINUE;
 
     /* dynamic ps is supported only in managed mode */
     if (tx->sdata->vif.type != NL80211_IFTYPE_STATION)
         return TX_CONTINUE;
 
     if (unlikely(info->flags & IEEE80211_TX_INTFL_OFFCHAN_TX_OK))
         return TX_CONTINUE;
 
     ifmgd = &tx->sdata->u.mgd;
 
     /*
      * Don't wakeup from power save if u-apsd is enabled, voip ac has
      * u-apsd enabled and the frame is in voip class. This effectively
      * means that even if all access categories have u-apsd enabled, in
      * practise u-apsd is only used with the voip ac. This is a
      * workaround for the case when received voip class packets do not
      * have correct qos tag for some reason, due the network or the
      * peer application.
      *
      * Note: ifmgd->uapsd_queues access is racy here. If the value is
      * changed via debugfs, user needs to reassociate manually to have
      * everything in sync.
      */
     if ((ifmgd->flags & IEEE80211_STA_UAPSD_ENABLED) &&
         (ifmgd->uapsd_queues & IEEE80211_WMM_IE_STA_QOSINFO_AC_VO) &&
         skb_get_queue_mapping(tx->skb) == IEEE80211_AC_VO)
         return TX_CONTINUE;
 
     if (local->hw.conf.flags & IEEE80211_CONF_PS) {
         ieee80211_stop_queues_by_reason(&local->hw,
                         IEEE80211_MAX_QUEUE_MAP,
                         IEEE80211_QUEUE_STOP_REASON_PS,
                         false);
         ifmgd->flags &= ~IEEE80211_STA_NULLFUNC_ACKED;
         ieee80211_queue_work(&local->hw,
                      &local->dynamic_ps_disable_work);
     }
 
     /* Don't restart the timer if we're not disassociated */
     if (!ifmgd->associated)
         return TX_CONTINUE;
 
     mod_timer(&local->dynamic_ps_timer, jiffies +
           msecs_to_jiffies(local->hw.conf.dynamic_ps_timeout));
 
     return TX_CONTINUE;
 }
 
 static ieee80211_tx_result debug_noinline
 ieee80211_tx_h_check_assoc(struct ieee80211_tx_data *tx)
 {
 
     struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
     struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
     bool assoc = false;
 
     if (unlikely(info->flags & IEEE80211_TX_CTL_INJECTED))
         return TX_CONTINUE;
 
     if (unlikely(test_bit(SCAN_SW_SCANNING, &tx->local->scanning)) &&
         test_bit(SDATA_STATE_OFFCHANNEL, &tx->sdata->state) &&
         !ieee80211_is_probe_req(hdr->frame_control) &&
         !ieee80211_is_any_nullfunc(hdr->frame_control))
         /*
          * When software scanning only nullfunc frames (to notify
          * the sleep state to the AP) and probe requests (for the
          * active scan) are allowed, all other frames should not be
          * sent and we should not get here, but if we do
          * nonetheless, drop them to avoid sending them
          * off-channel. See the link below and
          * ieee80211_start_scan() for more.
          *
          * http://article.gmane.org/gmane.linux.kernel.wireless.general/30089
          */
         return TX_DROP;
 
     if (tx->sdata->vif.type == NL80211_IFTYPE_OCB)
         return TX_CONTINUE;
 
     if (tx->flags & IEEE80211_TX_PS_BUFFERED)
         return TX_CONTINUE;
 
     if (tx->sta)
         assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
 
     if (likely(tx->flags & IEEE80211_TX_UNICAST)) {
         if (unlikely(!assoc &&
                  ieee80211_is_data(hdr->frame_control))) {
 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
             sdata_info(tx->sdata,
                    "dropped data frame to not associated station %pM\n",
                    hdr->addr1);
 #endif
             I802_DEBUG_INC(tx->local->tx_handlers_drop_not_assoc);
             return TX_DROP;
         }
     } else if (unlikely(ieee80211_is_data(hdr->frame_control) &&
                 ieee80211_vif_get_num_mcast_if(tx->sdata) == 0)) {
         /*
          * No associated STAs - no need to send multicast
          * frames.
          */
         return TX_DROP;
     }
 
     return TX_CONTINUE;
 }
 
 /* This function is called whenever the AP is about to exceed the maximum limit
  * of buffered frames for power saving STAs. This situation should not really
  * happen often during normal operation, so dropping the oldest buffered packet
  * from each queue should be OK to make some room for new frames. */
 static void purge_old_ps_buffers(struct ieee80211_local *local)
 {
     int total = 0, purged = 0;
     struct sk_buff *skb;
     struct ieee80211_sub_if_data *sdata;
     struct sta_info *sta;
 
     list_for_each_entry_rcu(sdata, &local->interfaces, list) {
         struct ps_data *ps;
 
         if (sdata->vif.type == NL80211_IFTYPE_AP)
             ps = &sdata->u.ap.ps;
         else if (ieee80211_vif_is_mesh(&sdata->vif))
             ps = &sdata->u.mesh.ps;
         else
             continue;
 
         skb = skb_dequeue(&ps->bc_buf);
         if (skb) {
             purged++;
             ieee80211_free_txskb(&local->hw, skb);
         }
         total += skb_queue_len(&ps->bc_buf);
     }
 
     /*
      * Drop one frame from each station from the lowest-priority
      * AC that has frames at all.
      */
     list_for_each_entry_rcu(sta, &local->sta_list, list) {
         int ac;
 
         for (ac = IEEE80211_AC_BK; ac >= IEEE80211_AC_VO; ac--) {
             skb = skb_dequeue(&sta->ps_tx_buf[ac]);
             total += skb_queue_len(&sta->ps_tx_buf[ac]);
             if (skb) {
                 purged++;
                 ieee80211_free_txskb(&local->hw, skb);
                 break;
             }
         }
     }
 
     local->total_ps_buffered = total;
     ps_dbg_hw(&local->hw, "PS buffers full - purged %d frames\n", purged);
 }
 
 static ieee80211_tx_result
 ieee80211_tx_h_multicast_ps_buf(struct ieee80211_tx_data *tx)
 {
     struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
     struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
     struct ps_data *ps;
 
     /*
      * broadcast/multicast frame
      *
      * If any of the associated/peer stations is in power save mode,
      * the frame is buffered to be sent after DTIM beacon frame.
      * This is done either by the hardware or us.
      */
 
     /* powersaving STAs currently only in AP/VLAN/mesh mode */
     if (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
         tx->sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
         if (!tx->sdata->bss)
             return TX_CONTINUE;
 
         ps = &tx->sdata->bss->ps;
     } else if (ieee80211_vif_is_mesh(&tx->sdata->vif)) {
         ps = &tx->sdata->u.mesh.ps;
     } else {
         return TX_CONTINUE;
     }
 
 
     /* no buffering for ordered frames */
     if (ieee80211_has_order(hdr->frame_control))
         return TX_CONTINUE;
 
     if (ieee80211_is_probe_req(hdr->frame_control))
         return TX_CONTINUE;
 
     if (ieee80211_hw_check(&tx->local->hw, QUEUE_CONTROL))
         info->hw_queue = tx->sdata->vif.cab_queue;
 
     /* no stations in PS mode and no buffered packets */
     if (!atomic_read(&ps->num_sta_ps) && skb_queue_empty(&ps->bc_buf))
         return TX_CONTINUE;
 
     info->flags |= IEEE80211_TX_CTL_SEND_AFTER_DTIM;
 
     /* device releases frame after DTIM beacon */
     if (!ieee80211_hw_check(&tx->local->hw, HOST_BROADCAST_PS_BUFFERING))
         return TX_CONTINUE;
 
     /* buffered in mac80211 */
     if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
         purge_old_ps_buffers(tx->local);
 
     if (skb_queue_len(&ps->bc_buf) >= AP_MAX_BC_BUFFER) {
         ps_dbg(tx->sdata,
                "BC TX buffer full - dropping the oldest frame\n");
         ieee80211_free_txskb(&tx->local->hw, skb_dequeue(&ps->bc_buf));
     } else
         tx->local->total_ps_buffered++;
 
     skb_queue_tail(&ps->bc_buf, tx->skb);
 
     return TX_QUEUED;
 }
 
 static int ieee80211_use_mfp(__le16 fc, struct sta_info *sta,
                  struct sk_buff *skb)
 {
     if (!ieee80211_is_mgmt(fc))
         return 0;
 
     if (sta == NULL || !test_sta_flag(sta, WLAN_STA_MFP))
         return 0;
 
     if (!ieee80211_is_robust_mgmt_frame(skb))
         return 0;
 
     return 1;
 }
 
 static ieee80211_tx_result
 ieee80211_tx_h_unicast_ps_buf(struct ieee80211_tx_data *tx)
 {
     struct sta_info *sta = tx->sta;
     struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
     struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
     struct ieee80211_local *local = tx->local;
 
     if (unlikely(!sta))
         return TX_CONTINUE;
 
     if (unlikely((test_sta_flag(sta, WLAN_STA_PS_STA) ||
               test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
               test_sta_flag(sta, WLAN_STA_PS_DELIVER)) &&
              !(info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER))) {
         int ac = skb_get_queue_mapping(tx->skb);
 
         if (ieee80211_is_mgmt(hdr->frame_control) &&
             !ieee80211_is_bufferable_mmpdu(hdr->frame_control)) {
             info->flags |= IEEE80211_TX_CTL_NO_PS_BUFFER;
             return TX_CONTINUE;
         }
 
         ps_dbg(sta->sdata, "STA %pM aid %d: PS buffer for AC %d\n",
                sta->sta.addr, sta->sta.aid, ac);
         if (tx->local->total_ps_buffered >= TOTAL_MAX_TX_BUFFER)
             purge_old_ps_buffers(tx->local);
 
         /* sync with ieee80211_sta_ps_deliver_wakeup */
         spin_lock(&sta->ps_lock);
         /*
          * STA woke up the meantime and all the frames on ps_tx_buf have
          * been queued to pending queue. No reordering can happen, go
          * ahead and Tx the packet.
          */
         if (!test_sta_flag(sta, WLAN_STA_PS_STA) &&
             !test_sta_flag(sta, WLAN_STA_PS_DRIVER) &&
             !test_sta_flag(sta, WLAN_STA_PS_DELIVER)) {
             spin_unlock(&sta->ps_lock);
             return TX_CONTINUE;
         }
 
         if (skb_queue_len(&sta->ps_tx_buf[ac]) >= STA_MAX_TX_BUFFER) {
             struct sk_buff *old = skb_dequeue(&sta->ps_tx_buf[ac]);
             ps_dbg(tx->sdata,
                    "STA %pM TX buffer for AC %d full - dropping oldest frame\n",
                    sta->sta.addr, ac);
             ieee80211_free_txskb(&local->hw, old);
         } else
             tx->local->total_ps_buffered++;
 
         info->control.jiffies = jiffies;
         info->control.vif = &tx->sdata->vif;
         info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
         info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
         skb_queue_tail(&sta->ps_tx_buf[ac], tx->skb);
         spin_unlock(&sta->ps_lock);
 
         if (!timer_pending(&local->sta_cleanup))
             mod_timer(&local->sta_cleanup,
                   round_jiffies(jiffies +
                         STA_INFO_CLEANUP_INTERVAL));
 
         /*
          * We queued up some frames, so the TIM bit might
          * need to be set, recalculate it.
          */
         sta_info_recalc_tim(sta);
 
         return TX_QUEUED;
     } else if (unlikely(test_sta_flag(sta, WLAN_STA_PS_STA))) {
         ps_dbg(tx->sdata,
                "STA %pM in PS mode, but polling/in SP -> send frame\n",
                sta->sta.addr);
     }
 
     return TX_CONTINUE;
 }
 
 static ieee80211_tx_result debug_noinline
 ieee80211_tx_h_ps_buf(struct ieee80211_tx_data *tx)
 {
     if (unlikely(tx->flags & IEEE80211_TX_PS_BUFFERED))
         return TX_CONTINUE;
 
     if (tx->flags & IEEE80211_TX_UNICAST)
         return ieee80211_tx_h_unicast_ps_buf(tx);
     else
         return ieee80211_tx_h_multicast_ps_buf(tx);
 }
 
 static ieee80211_tx_result debug_noinline
 ieee80211_tx_h_check_control_port_protocol(struct ieee80211_tx_data *tx)
 {
     struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
 
     if (unlikely(tx->sdata->control_port_protocol == tx->skb->protocol)) {
         if (tx->sdata->control_port_no_encrypt)
             info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
         info->control.flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO;
         info->flags |= IEEE80211_TX_CTL_USE_MINRATE;
     }
 
     return TX_CONTINUE;
 }
 
 static ieee80211_tx_result debug_noinline
 ieee80211_tx_h_select_key(struct ieee80211_tx_data *tx)
 {
     struct ieee80211_key *key;
     struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
     struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
 
     if (unlikely(info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)) {
         tx->key = NULL;
         return TX_CONTINUE;
     }
 
     if (tx->sta &&
         (key = rcu_dereference(tx->sta->ptk[tx->sta->ptk_idx])))
         tx->key = key;
     else if (ieee80211_is_group_privacy_action(tx->skb) &&
         (key = rcu_dereference(tx->sdata->deflink.default_multicast_key)))
         tx->key = key;
     else if (ieee80211_is_mgmt(hdr->frame_control) &&
          is_multicast_ether_addr(hdr->addr1) &&
          ieee80211_is_robust_mgmt_frame(tx->skb) &&
          (key = rcu_dereference(tx->sdata->deflink.default_mgmt_key)))
         tx->key = key;
     else if (is_multicast_ether_addr(hdr->addr1) &&
          (key = rcu_dereference(tx->sdata->deflink.default_multicast_key)))
         tx->key = key;
     else if (!is_multicast_ether_addr(hdr->addr1) &&
          (key = rcu_dereference(tx->sdata->default_unicast_key)))
         tx->key = key;
     else
         tx->key = NULL;
 
     if (tx->key) {
         bool skip_hw = false;
 
         /* TODO: add threshold stuff again */
 
         switch (tx->key->conf.cipher) {
         case WLAN_CIPHER_SUITE_WEP40:
         case WLAN_CIPHER_SUITE_WEP104:
         case WLAN_CIPHER_SUITE_TKIP:
             if (!ieee80211_is_data_present(hdr->frame_control))
                 tx->key = NULL;
             break;
         case WLAN_CIPHER_SUITE_CCMP:
         case WLAN_CIPHER_SUITE_CCMP_256:
         case WLAN_CIPHER_SUITE_GCMP:
         case WLAN_CIPHER_SUITE_GCMP_256:
             if (!ieee80211_is_data_present(hdr->frame_control) &&
                 !ieee80211_use_mfp(hdr->frame_control, tx->sta,
                            tx->skb) &&
                 !ieee80211_is_group_privacy_action(tx->skb))
                 tx->key = NULL;
             else
                 skip_hw = (tx->key->conf.flags &
                        IEEE80211_KEY_FLAG_SW_MGMT_TX) &&
                     ieee80211_is_mgmt(hdr->frame_control);
             break;
         case WLAN_CIPHER_SUITE_AES_CMAC:
         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
             if (!ieee80211_is_mgmt(hdr->frame_control))
                 tx->key = NULL;
             break;
         }
 
         if (unlikely(tx->key && tx->key->flags & KEY_FLAG_TAINTED &&
                  !ieee80211_is_deauth(hdr->frame_control)))
             return TX_DROP;
 
         if (!skip_hw && tx->key &&
             tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
             info->control.hw_key = &tx->key->conf;
     } else if (ieee80211_is_data_present(hdr->frame_control) && tx->sta &&
            test_sta_flag(tx->sta, WLAN_STA_USES_ENCRYPTION)) {
         return TX_DROP;
     }
 
     return TX_CONTINUE;
 }
 
 static ieee80211_tx_result debug_noinline
 ieee80211_tx_h_rate_ctrl(struct ieee80211_tx_data *tx)
 {
     struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
     struct ieee80211_hdr *hdr = (void *)tx->skb->data;
     struct ieee80211_supported_band *sband;
     u32 len;
     struct ieee80211_tx_rate_control txrc;
     struct ieee80211_sta_rates *ratetbl = NULL;
     bool encap = info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP;
     bool assoc = false;
 
     memset(&txrc, 0, sizeof(txrc));
 
     sband = tx->local->hw.wiphy->bands[info->band];
 
     len = min_t(u32, tx->skb->len + FCS_LEN,
              tx->local->hw.wiphy->frag_threshold);
 
     /* set up the tx rate control struct we give the RC algo */
     txrc.hw = &tx->local->hw;
     txrc.sband = sband;
     txrc.bss_conf = &tx->sdata->vif.bss_conf;
     txrc.skb = tx->skb;
     txrc.reported_rate.idx = -1;
     txrc.rate_idx_mask = tx->sdata->rc_rateidx_mask[info->band];
 
     if (tx->sdata->rc_has_mcs_mask[info->band])
         txrc.rate_idx_mcs_mask =
             tx->sdata->rc_rateidx_mcs_mask[info->band];
 
     txrc.bss = (tx->sdata->vif.type == NL80211_IFTYPE_AP ||
             tx->sdata->vif.type == NL80211_IFTYPE_MESH_POINT ||
             tx->sdata->vif.type == NL80211_IFTYPE_ADHOC ||
             tx->sdata->vif.type == NL80211_IFTYPE_OCB);
 
     /* set up RTS protection if desired */
     if (len > tx->local->hw.wiphy->rts_threshold) {
         txrc.rts = true;
     }
 
     info->control.use_rts = txrc.rts;
     info->control.use_cts_prot = tx->sdata->vif.bss_conf.use_cts_prot;
 
     /*
      * Use short preamble if the BSS can handle it, but not for
      * management frames unless we know the receiver can handle
      * that -- the management frame might be to a station that
      * just wants a probe response.
      */
     if (tx->sdata->vif.bss_conf.use_short_preamble &&
         (ieee80211_is_tx_data(tx->skb) ||
          (tx->sta && test_sta_flag(tx->sta, WLAN_STA_SHORT_PREAMBLE))))
         txrc.short_preamble = true;
 
     info->control.short_preamble = txrc.short_preamble;
 
     /* don't ask rate control when rate already injected via radiotap */
     if (info->control.flags & IEEE80211_TX_CTRL_RATE_INJECT)
         return TX_CONTINUE;
 
     if (tx->sta)
         assoc = test_sta_flag(tx->sta, WLAN_STA_ASSOC);
 
     /*
      * Lets not bother rate control if we're associated and cannot
      * talk to the sta. This should not happen.
      */
     if (WARN(test_bit(SCAN_SW_SCANNING, &tx->local->scanning) && assoc &&
          !rate_usable_index_exists(sband, &tx->sta->sta),
          "%s: Dropped data frame as no usable bitrate found while "
          "scanning and associated. Target station: "
          "%pM on %d GHz band\n",
          tx->sdata->name,
          encap ? ((struct ethhdr *)hdr)->h_dest : hdr->addr1,
          info->band ? 5 : 2))
         return TX_DROP;
 
     /*
      * If we're associated with the sta at this point we know we can at
      * least send the frame at the lowest bit rate.
      */
     rate_control_get_rate(tx->sdata, tx->sta, &txrc);
 
     if (tx->sta && !info->control.skip_table)
         ratetbl = rcu_dereference(tx->sta->sta.rates);
 
     if (unlikely(info->control.rates[0].idx < 0)) {
         if (ratetbl) {
             struct ieee80211_tx_rate rate = {
                 .idx = ratetbl->rate[0].idx,
                 .flags = ratetbl->rate[0].flags,
                 .count = ratetbl->rate[0].count
             };
 
             if (ratetbl->rate[0].idx < 0)
                 return TX_DROP;
 
             tx->rate = rate;
         } else {
             return TX_DROP;
         }
     } else {
         tx->rate = info->control.rates[0];
     }
 
     if (txrc.reported_rate.idx < 0) {
         txrc.reported_rate = tx->rate;
         if (tx->sta && ieee80211_is_tx_data(tx->skb))
             tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate;
     } else if (tx->sta)
         tx->sta->deflink.tx_stats.last_rate = txrc.reported_rate;
 
     if (ratetbl)
         return TX_CONTINUE;
 
     if (unlikely(!info->control.rates[0].count))
         info->control.rates[0].count = 1;
 
     if (WARN_ON_ONCE((info->control.rates[0].count > 1) &&
              (info->flags & IEEE80211_TX_CTL_NO_ACK)))
         info->control.rates[0].count = 1;
 
     return TX_CONTINUE;
 }
 
 static __le16 ieee80211_tx_next_seq(struct sta_info *sta, int tid)
 {
     u16 *seq = &sta->tid_seq[tid];
     __le16 ret = cpu_to_le16(*seq);
 
     /* Increase the sequence number. */
     *seq = (*seq + 0x10) & IEEE80211_SCTL_SEQ;
 
     return ret;
 }
 
 static ieee80211_tx_result debug_noinline
 ieee80211_tx_h_sequence(struct ieee80211_tx_data *tx)
 {
     struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
     struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)tx->skb->data;
     int tid;
 
     /*
      * Packet injection may want to control the sequence
      * number, if we have no matching interface then we
      * neither assign one ourselves nor ask the driver to.
      */
     if (unlikely(info->control.vif->type == NL80211_IFTYPE_MONITOR))
         return TX_CONTINUE;
 
     if (unlikely(ieee80211_is_ctl(hdr->frame_control)))
         return TX_CONTINUE;
 
     if (ieee80211_hdrlen(hdr->frame_control) < 24)
         return TX_CONTINUE;
 
     if (ieee80211_is_qos_nullfunc(hdr->frame_control))
         return TX_CONTINUE;
 
     if (info->control.flags & IEEE80211_TX_CTRL_NO_SEQNO)
         return TX_CONTINUE;
 
     /* SNS11 from 802.11be 10.3.2.14 */
     if (unlikely(is_multicast_ether_addr(hdr->addr1) &&
              info->control.vif->valid_links &&
              info->control.vif->type == NL80211_IFTYPE_AP)) {
         if (info->control.flags & IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX)
             tx->sdata->mld_mcast_seq += 0x10;
         hdr->seq_ctrl = cpu_to_le16(tx->sdata->mld_mcast_seq);
         return TX_CONTINUE;
     }
 
     /*
      * Anything but QoS data that has a sequence number field
      * (is long enough) gets a sequence number from the global
      * counter.  QoS data frames with a multicast destination
      * also use the global counter (802.11-2012 9.3.2.10).
      */
     if (!ieee80211_is_data_qos(hdr->frame_control) ||
         is_multicast_ether_addr(hdr->addr1)) {
         /* driver should assign sequence number */
         info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
         /* for pure STA mode without beacons, we can do it */
         hdr->seq_ctrl = cpu_to_le16(tx->sdata->sequence_number);
         tx->sdata->sequence_number += 0x10;
         if (tx->sta)
             tx->sta->deflink.tx_stats.msdu[IEEE80211_NUM_TIDS]++;
         return TX_CONTINUE;
     }
 
     /*
      * This should be true for injected/management frames only, for
      * management frames we have set the IEEE80211_TX_CTL_ASSIGN_SEQ
      * above since they are not QoS-data frames.
      */
     if (!tx->sta)
         return TX_CONTINUE;
 
     /* include per-STA, per-TID sequence counter */
     tid = ieee80211_get_tid(hdr);
     tx->sta->deflink.tx_stats.msdu[tid]++;
 
     hdr->seq_ctrl = ieee80211_tx_next_seq(tx->sta, tid);
 
     return TX_CONTINUE;
 }
 
 static int ieee80211_fragment(struct ieee80211_tx_data *tx,
                   struct sk_buff *skb, int hdrlen,
                   int frag_threshold)
 {
     struct ieee80211_local *local = tx->local;
     struct ieee80211_tx_info *info;
     struct sk_buff *tmp;
     int per_fragm = frag_threshold - hdrlen - FCS_LEN;
     int pos = hdrlen + per_fragm;
     int rem = skb->len - hdrlen - per_fragm;
 
     if (WARN_ON(rem < 0))
         return -EINVAL;
 
     /* first fragment was already added to queue by caller */
 
     while (rem) {
         int fraglen = per_fragm;
 
         if (fraglen > rem)
             fraglen = rem;
         rem -= fraglen;
         tmp = dev_alloc_skb(local->tx_headroom +
                     frag_threshold +
                     IEEE80211_ENCRYPT_HEADROOM +
                     IEEE80211_ENCRYPT_TAILROOM);
         if (!tmp)
             return -ENOMEM;
 
         __skb_queue_tail(&tx->skbs, tmp);
 
         skb_reserve(tmp,
                 local->tx_headroom + IEEE80211_ENCRYPT_HEADROOM);
 
         /* copy control information */
         memcpy(tmp->cb, skb->cb, sizeof(tmp->cb));
 
         info = IEEE80211_SKB_CB(tmp);
         info->flags &= ~(IEEE80211_TX_CTL_CLEAR_PS_FILT |
                  IEEE80211_TX_CTL_FIRST_FRAGMENT);
 
         if (rem)
             info->flags |= IEEE80211_TX_CTL_MORE_FRAMES;
 
         skb_copy_queue_mapping(tmp, skb);
         tmp->priority = skb->priority;
         tmp->dev = skb->dev;
 
         /* copy header and data */
         skb_put_data(tmp, skb->data, hdrlen);
         skb_put_data(tmp, skb->data + pos, fraglen);
 
         pos += fraglen;
     }
 
     /* adjust first fragment's length */
     skb_trim(skb, hdrlen + per_fragm);
     return 0;
 }
 
 static ieee80211_tx_result debug_noinline
 ieee80211_tx_h_fragment(struct ieee80211_tx_data *tx)
 {
     struct sk_buff *skb = tx->skb;
     struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
     struct ieee80211_hdr *hdr = (void *)skb->data;
     int frag_threshold = tx->local->hw.wiphy->frag_threshold;
     int hdrlen;
     int fragnum;
 
     /* no matter what happens, tx->skb moves to tx->skbs */
     __skb_queue_tail(&tx->skbs, skb);
     tx->skb = NULL;
 
     if (info->flags & IEEE80211_TX_CTL_DONTFRAG)
         return TX_CONTINUE;
 
     if (ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG))
         return TX_CONTINUE;
 
     /*
      * Warn when submitting a fragmented A-MPDU frame and drop it.
      * This scenario is handled in ieee80211_tx_prepare but extra
      * caution taken here as fragmented ampdu may cause Tx stop.
      */
     if (WARN_ON(info->flags & IEEE80211_TX_CTL_AMPDU))
         return TX_DROP;
 
     hdrlen = ieee80211_hdrlen(hdr->frame_control);
 
     /* internal error, why isn't DONTFRAG set? */
     if (WARN_ON(skb->len + FCS_LEN <= frag_threshold))
         return TX_DROP;
 
     /*
      * Now fragment the frame. This will allocate all the fragments and
      * chain them (using skb as the first fragment) to skb->next.
      * During transmission, we will remove the successfully transmitted
      * fragments from this list. When the low-level driver rejects one
      * of the fragments then we will simply pretend to accept the skb
      * but store it away as pending.
      */
     if (ieee80211_fragment(tx, skb, hdrlen, frag_threshold))
         return TX_DROP;
 
     /* update duration/seq/flags of fragments */
     fragnum = 0;
 
     skb_queue_walk(&tx->skbs, skb) {
         const __le16 morefrags = cpu_to_le16(IEEE80211_FCTL_MOREFRAGS);
 
         hdr = (void *)skb->data;
         info = IEEE80211_SKB_CB(skb);
 
         if (!skb_queue_is_last(&tx->skbs, skb)) {
             hdr->frame_control |= morefrags;
             /*
              * No multi-rate retries for fragmented frames, that
              * would completely throw off the NAV at other STAs.
              */
             info->control.rates[1].idx = -1;
             info->control.rates[2].idx = -1;
             info->control.rates[3].idx = -1;
             BUILD_BUG_ON(IEEE80211_TX_MAX_RATES != 4);
             info->flags &= ~IEEE80211_TX_CTL_RATE_CTRL_PROBE;
         } else {
             hdr->frame_control &= ~morefrags;
         }
         hdr->seq_ctrl |= cpu_to_le16(fragnum & IEEE80211_SCTL_FRAG);
         fragnum++;
     }
 
     return TX_CONTINUE;
 }
 
 static ieee80211_tx_result debug_noinline
 ieee80211_tx_h_stats(struct ieee80211_tx_data *tx)
 {
     struct sk_buff *skb;
     int ac = -1;
 
     if (!tx->sta)
         return TX_CONTINUE;
 
     skb_queue_walk(&tx->skbs, skb) {
         ac = skb_get_queue_mapping(skb);
         tx->sta->deflink.tx_stats.bytes[ac] += skb->len;
     }
     if (ac >= 0)
         tx->sta->deflink.tx_stats.packets[ac]++;
 
     return TX_CONTINUE;
 }
 
 static ieee80211_tx_result debug_noinline
 ieee80211_tx_h_encrypt(struct ieee80211_tx_data *tx)
 {
     if (!tx->key)
         return TX_CONTINUE;
 
     switch (tx->key->conf.cipher) {
     case WLAN_CIPHER_SUITE_WEP40:
     case WLAN_CIPHER_SUITE_WEP104:
         return ieee80211_crypto_wep_encrypt(tx);
     case WLAN_CIPHER_SUITE_TKIP:
         return ieee80211_crypto_tkip_encrypt(tx);
     case WLAN_CIPHER_SUITE_CCMP:
         return ieee80211_crypto_ccmp_encrypt(
             tx, IEEE80211_CCMP_MIC_LEN);
     case WLAN_CIPHER_SUITE_CCMP_256:
         return ieee80211_crypto_ccmp_encrypt(
             tx, IEEE80211_CCMP_256_MIC_LEN);
     case WLAN_CIPHER_SUITE_AES_CMAC:
         return ieee80211_crypto_aes_cmac_encrypt(tx);
     case WLAN_CIPHER_SUITE_BIP_CMAC_256:
         return ieee80211_crypto_aes_cmac_256_encrypt(tx);
     case WLAN_CIPHER_SUITE_BIP_GMAC_128:
     case WLAN_CIPHER_SUITE_BIP_GMAC_256:
         return ieee80211_crypto_aes_gmac_encrypt(tx);
     case WLAN_CIPHER_SUITE_GCMP:
     case WLAN_CIPHER_SUITE_GCMP_256:
         return ieee80211_crypto_gcmp_encrypt(tx);
     }
 
     return TX_DROP;
 }
 
 static ieee80211_tx_result debug_noinline
 ieee80211_tx_h_calculate_duration(struct ieee80211_tx_data *tx)
 {
     struct sk_buff *skb;
     struct ieee80211_hdr *hdr;
     int next_len;
     bool group_addr;
 
     skb_queue_walk(&tx->skbs, skb) {
         hdr = (void *) skb->data;
         if (unlikely(ieee80211_is_pspoll(hdr->frame_control)))
             break; /* must not overwrite AID */
         if (!skb_queue_is_last(&tx->skbs, skb)) {
             struct sk_buff *next = skb_queue_next(&tx->skbs, skb);
             next_len = next->len;
         } else
             next_len = 0;
         group_addr = is_multicast_ether_addr(hdr->addr1);
 
         hdr->duration_id =
             ieee80211_duration(tx, skb, group_addr, next_len);
     }
 
     return TX_CONTINUE;
 }
 
 /* actual transmit path */
 
 static bool ieee80211_tx_prep_agg(struct ieee80211_tx_data *tx,
                   struct sk_buff *skb,
                   struct ieee80211_tx_info *info,
                   struct tid_ampdu_tx *tid_tx,
                   int tid)
 {
     bool queued = false;
     bool reset_agg_timer = false;
     struct sk_buff *purge_skb = NULL;
 
     if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
         info->flags |= IEEE80211_TX_CTL_AMPDU;
         reset_agg_timer = true;
     } else if (test_bit(HT_AGG_STATE_WANT_START, &tid_tx->state)) {
         /*
          * nothing -- this aggregation session is being started
          * but that might still fail with the driver
          */
     } else if (!tx->sta->sta.txq[tid]) {
         spin_lock(&tx->sta->lock);
         /*
          * Need to re-check now, because we may get here
          *
          *  1) in the window during which the setup is actually
          *     already done, but not marked yet because not all
          *     packets are spliced over to the driver pending
          *     queue yet -- if this happened we acquire the lock
          *     either before or after the splice happens, but
          *     need to recheck which of these cases happened.
          *
          *  2) during session teardown, if the OPERATIONAL bit
          *     was cleared due to the teardown but the pointer
          *     hasn't been assigned NULL yet (or we loaded it
          *     before it was assigned) -- in this case it may
          *     now be NULL which means we should just let the
          *     packet pass through because splicing the frames
          *     back is already done.
          */
         tid_tx = rcu_dereference_protected_tid_tx(tx->sta, tid);
 
         if (!tid_tx) {
             /* do nothing, let packet pass through */
         } else if (test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
             info->flags |= IEEE80211_TX_CTL_AMPDU;
             reset_agg_timer = true;
         } else {
             queued = true;
             if (info->flags & IEEE80211_TX_CTL_NO_PS_BUFFER) {
                 clear_sta_flag(tx->sta, WLAN_STA_SP);
                 ps_dbg(tx->sta->sdata,
                        "STA %pM aid %d: SP frame queued, close the SP w/o telling the peer\n",
                        tx->sta->sta.addr, tx->sta->sta.aid);
             }
             info->control.vif = &tx->sdata->vif;
             info->control.flags |= IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
             info->flags &= ~IEEE80211_TX_TEMPORARY_FLAGS;
             __skb_queue_tail(&tid_tx->pending, skb);
             if (skb_queue_len(&tid_tx->pending) > STA_MAX_TX_BUFFER)
                 purge_skb = __skb_dequeue(&tid_tx->pending);
         }
         spin_unlock(&tx->sta->lock);
 
         if (purge_skb)
             ieee80211_free_txskb(&tx->local->hw, purge_skb);
     }
 
     /* reset session timer */
     if (reset_agg_timer)
         tid_tx->last_tx = jiffies;
 
     return queued;
 }
 
 static void
 ieee80211_aggr_check(struct ieee80211_sub_if_data *sdata,
              struct sta_info *sta,
              struct sk_buff *skb)
 {
     struct rate_control_ref *ref = sdata->local->rate_ctrl;
     u16 tid;
 
     if (!ref || !(ref->ops->capa & RATE_CTRL_CAPA_AMPDU_TRIGGER))
         return;
 
     if (!sta || !sta->sta.deflink.ht_cap.ht_supported ||
         !sta->sta.wme || skb_get_queue_mapping(skb) == IEEE80211_AC_VO ||
         skb->protocol == sdata->control_port_protocol)
         return;
 
     tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
     if (likely(sta->ampdu_mlme.tid_tx[tid]))
         return;
 
     ieee80211_start_tx_ba_session(&sta->sta, tid, 0);
 }
 
 /*
  * initialises @tx
  * pass %NULL for the station if unknown, a valid pointer if known
  * or an ERR_PTR() if the station is known not to exist
  */
 static ieee80211_tx_result
 ieee80211_tx_prepare(struct ieee80211_sub_if_data *sdata,
              struct ieee80211_tx_data *tx,
              struct sta_info *sta, struct sk_buff *skb)
 {
     struct ieee80211_local *local = sdata->local;
     struct ieee80211_hdr *hdr;
     struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
     bool aggr_check = false;
     int tid;
 
     memset(tx, 0, sizeof(*tx));
     tx->skb = skb;
     tx->local = local;
     tx->sdata = sdata;
     __skb_queue_head_init(&tx->skbs);
 
     /*
      * If this flag is set to true anywhere, and we get here,
      * we are doing the needed processing, so remove the flag
      * now.
      */
     info->control.flags &= ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
 
     hdr = (struct ieee80211_hdr *) skb->data;
 
     if (likely(sta)) {
         if (!IS_ERR(sta))
             tx->sta = sta;
     } else {
         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
             tx->sta = rcu_dereference(sdata->u.vlan.sta);
             if (!tx->sta && sdata->wdev.use_4addr)
                 return TX_DROP;
         } else if (tx->sdata->control_port_protocol == tx->skb->protocol) {
             tx->sta = sta_info_get_bss(sdata, hdr->addr1);
         }
         if (!tx->sta && !is_multicast_ether_addr(hdr->addr1)) {
             tx->sta = sta_info_get(sdata, hdr->addr1);
             aggr_check = true;
         }
     }
 
     if (tx->sta && ieee80211_is_data_qos(hdr->frame_control) &&
         !ieee80211_is_qos_nullfunc(hdr->frame_control) &&
         ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION) &&
         !ieee80211_hw_check(&local->hw, TX_AMPDU_SETUP_IN_HW)) {
         struct tid_ampdu_tx *tid_tx;
 
         tid = ieee80211_get_tid(hdr);
         tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
         if (!tid_tx && aggr_check) {
             ieee80211_aggr_check(sdata, tx->sta, skb);
             tid_tx = rcu_dereference(tx->sta->ampdu_mlme.tid_tx[tid]);
         }
 
         if (tid_tx) {
             bool queued;
 
             queued = ieee80211_tx_prep_agg(tx, skb, info,
                                tid_tx, tid);
 
             if (unlikely(queued))
                 return TX_QUEUED;
         }
     }
 
     if (is_multicast_ether_addr(hdr->addr1)) {
         tx->flags &= ~IEEE80211_TX_UNICAST;
         info->flags |= IEEE80211_TX_CTL_NO_ACK;
     } else
         tx->flags |= IEEE80211_TX_UNICAST;
 
     if (!(info->flags & IEEE80211_TX_CTL_DONTFRAG)) {
         if (!(tx->flags & IEEE80211_TX_UNICAST) ||
             skb->len + FCS_LEN <= local->hw.wiphy->frag_threshold ||
             info->flags & IEEE80211_TX_CTL_AMPDU)
             info->flags |= IEEE80211_TX_CTL_DONTFRAG;
     }
 
     if (!tx->sta)
         info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
     else if (test_and_clear_sta_flag(tx->sta, WLAN_STA_CLEAR_PS_FILT)) {
         info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT;
         ieee80211_check_fast_xmit(tx->sta);
     }
 
     info->flags |= IEEE80211_TX_CTL_FIRST_FRAGMENT;
 
     return TX_CONTINUE;
 }
 
 static struct txq_info *ieee80211_get_txq(struct ieee80211_local *local,
                       struct ieee80211_vif *vif,
                       struct sta_info *sta,
                       struct sk_buff *skb)
 {
     struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
     struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
     struct ieee80211_txq *txq = NULL;
 
     if ((info->flags & IEEE80211_TX_CTL_SEND_AFTER_DTIM) ||
         (info->control.flags & IEEE80211_TX_CTRL_PS_RESPONSE))
         return NULL;
 
     if (!(info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) &&
         unlikely(!ieee80211_is_data_present(hdr->frame_control))) {
         if ((!ieee80211_is_mgmt(hdr->frame_control) ||
              ieee80211_is_bufferable_mmpdu(hdr->frame_control) ||
              vif->type == NL80211_IFTYPE_STATION) &&
             sta && sta->uploaded) {
             /*
              * This will be NULL if the driver didn't set the
              * opt-in hardware flag.
              */
             txq = sta->sta.txq[IEEE80211_NUM_TIDS];
         }
     } else if (sta) {
         u8 tid = skb->priority & IEEE80211_QOS_CTL_TID_MASK;
 
         if (!sta->uploaded)
             return NULL;
 
         txq = sta->sta.txq[tid];
     } else if (vif) {
         txq = vif->txq;
     }
 
     if (!txq)
         return NULL;
 
     return to_txq_info(txq);
 }
 
 static void ieee80211_set_skb_enqueue_time(struct sk_buff *skb)
 {
     IEEE80211_SKB_CB(skb)->control.enqueue_time = codel_get_time();
 }
 
 static u32 codel_skb_len_func(const struct sk_buff *skb)
 {
     return skb->len;
 }
 
 static codel_time_t codel_skb_time_func(const struct sk_buff *skb)
 {
     const struct ieee80211_tx_info *info;
 
     info = (const struct ieee80211_tx_info *)skb->cb;
     return info->control.enqueue_time;
 }
 
 static struct sk_buff *codel_dequeue_func(struct codel_vars *cvars,
                       void *ctx)
 {
     struct ieee80211_local *local;
     struct txq_info *txqi;
     struct fq *fq;
     struct fq_flow *flow;
 
     txqi = ctx;
     local = vif_to_sdata(txqi->txq.vif)->local;
     fq = &local->fq;
 
     if (cvars == &txqi->def_cvars)
         flow = &txqi->tin.default_flow;
     else
         flow = &fq->flows[cvars - local->cvars];
 
     return fq_flow_dequeue(fq, flow);
 }
 
 static void codel_drop_func(struct sk_buff *skb,
                 void *ctx)
 {
     struct ieee80211_local *local;
     struct ieee80211_hw *hw;
     struct txq_info *txqi;
 
     txqi = ctx;
     local = vif_to_sdata(txqi->txq.vif)->local;
     hw = &local->hw;
 
     ieee80211_free_txskb(hw, skb);
 }
 
 static struct sk_buff *fq_tin_dequeue_func(struct fq *fq,
                        struct fq_tin *tin,
                        struct fq_flow *flow)
 {
     struct ieee80211_local *local;
     struct txq_info *txqi;
     struct codel_vars *cvars;
     struct codel_params *cparams;
     struct codel_stats *cstats;
 
     local = container_of(fq, struct ieee80211_local, fq);
     txqi = container_of(tin, struct txq_info, tin);
     cstats = &txqi->cstats;
 
     if (txqi->txq.sta) {
         struct sta_info *sta = container_of(txqi->txq.sta,
                             struct sta_info, sta);
         cparams = &sta->cparams;
     } else {
         cparams = &local->cparams;
     }
 
     if (flow == &tin->default_flow)
         cvars = &txqi->def_cvars;
     else
         cvars = &local->cvars[flow - fq->flows];
 
     return codel_dequeue(txqi,
                  &flow->backlog,
                  cparams,
                  cvars,
                  cstats,
                  codel_skb_len_func,
                  codel_skb_time_func,
                  codel_drop_func,
                  codel_dequeue_func);
 }
 
 static void fq_skb_free_func(struct fq *fq,
                  struct fq_tin *tin,
                  struct fq_flow *flow,
                  struct sk_buff *skb)
 {
     struct ieee80211_local *local;
 
     local = container_of(fq, struct ieee80211_local, fq);
     ieee80211_free_txskb(&local->hw, skb);
 }
 
 static void ieee80211_txq_enqueue(struct ieee80211_local *local,
                   struct txq_info *txqi,
                   struct sk_buff *skb)
 {
     struct fq *fq = &local->fq;
     struct fq_tin *tin = &txqi->tin;
     u32 flow_idx = fq_flow_idx(fq, skb);
 
     ieee80211_set_skb_enqueue_time(skb);
 
     spin_lock_bh(&fq->lock);
     /*
      * For management frames, don't really apply codel etc.,
      * we don't want to apply any shaping or anything we just
      * want to simplify the driver API by having them on the
      * txqi.
      */
     if (unlikely(txqi->txq.tid == IEEE80211_NUM_TIDS)) {
         IEEE80211_SKB_CB(skb)->control.flags |=
             IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
         __skb_queue_tail(&txqi->frags, skb);
     } else {
         fq_tin_enqueue(fq, tin, flow_idx, skb,
                    fq_skb_free_func);
     }
     spin_unlock_bh(&fq->lock);
 }
 
 static bool fq_vlan_filter_func(struct fq *fq, struct fq_tin *tin,
                 struct fq_flow *flow, struct sk_buff *skb,
                 void *data)
 {
     struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 
     return info->control.vif == data;
 }
 
 void ieee80211_txq_remove_vlan(struct ieee80211_local *local,
                    struct ieee80211_sub_if_data *sdata)
 {
     struct fq *fq = &local->fq;
     struct txq_info *txqi;
     struct fq_tin *tin;
     struct ieee80211_sub_if_data *ap;
 
     if (WARN_ON(sdata->vif.type != NL80211_IFTYPE_AP_VLAN))
         return;
 
     ap = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
 
     if (!ap->vif.txq)
         return;
 
     txqi = to_txq_info(ap->vif.txq);
     tin = &txqi->tin;
 
     spin_lock_bh(&fq->lock);
     fq_tin_filter(fq, tin, fq_vlan_filter_func, &sdata->vif,
               fq_skb_free_func);
     spin_unlock_bh(&fq->lock);
 }
 
 void ieee80211_txq_init(struct ieee80211_sub_if_data *sdata,
             struct sta_info *sta,
             struct txq_info *txqi, int tid)
 {
     fq_tin_init(&txqi->tin);
     codel_vars_init(&txqi->def_cvars);
     codel_stats_init(&txqi->cstats);
     __skb_queue_head_init(&txqi->frags);
     INIT_LIST_HEAD(&txqi->schedule_order);
 
     txqi->txq.vif = &sdata->vif;
 
     if (!sta) {
         sdata->vif.txq = &txqi->txq;
         txqi->txq.tid = 0;
         txqi->txq.ac = IEEE80211_AC_BE;
 
         return;
     }
 
     if (tid == IEEE80211_NUM_TIDS) {
         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
             /* Drivers need to opt in to the management MPDU TXQ */
             if (!ieee80211_hw_check(&sdata->local->hw,
                         STA_MMPDU_TXQ))
                 return;
         } else if (!ieee80211_hw_check(&sdata->local->hw,
                            BUFF_MMPDU_TXQ)) {
             /* Drivers need to opt in to the bufferable MMPDU TXQ */
             return;
         }
         txqi->txq.ac = IEEE80211_AC_VO;
     } else {
         txqi->txq.ac = ieee80211_ac_from_tid(tid);
     }
 
     txqi->txq.sta = &sta->sta;
     txqi->txq.tid = tid;
     sta->sta.txq[tid] = &txqi->txq;
 }
 
 void ieee80211_txq_purge(struct ieee80211_local *local,
              struct txq_info *txqi)
 {
     struct fq *fq = &local->fq;
     struct fq_tin *tin = &txqi->tin;
 
     spin_lock_bh(&fq->lock);
     fq_tin_reset(fq, tin, fq_skb_free_func);
     ieee80211_purge_tx_queue(&local->hw, &txqi->frags);
     spin_unlock_bh(&fq->lock);
 
     spin_lock_bh(&local->active_txq_lock[txqi->txq.ac]);
     list_del_init(&txqi->schedule_order);
     spin_unlock_bh(&local->active_txq_lock[txqi->txq.ac]);
 }
 
 void ieee80211_txq_set_params(struct ieee80211_local *local)
 {
     if (local->hw.wiphy->txq_limit)
         local->fq.limit = local->hw.wiphy->txq_limit;
     else
         local->hw.wiphy->txq_limit = local->fq.limit;
 
     if (local->hw.wiphy->txq_memory_limit)
         local->fq.memory_limit = local->hw.wiphy->txq_memory_limit;
     else
         local->hw.wiphy->txq_memory_limit = local->fq.memory_limit;
 
     if (local->hw.wiphy->txq_quantum)
         local->fq.quantum = local->hw.wiphy->txq_quantum;
     else
         local->hw.wiphy->txq_quantum = local->fq.quantum;
 }
 
 int ieee80211_txq_setup_flows(struct ieee80211_local *local)
 {
     struct fq *fq = &local->fq;
     int ret;
     int i;
     bool supp_vht = false;
     enum nl80211_band band;
 
     if (!local->ops->wake_tx_queue)
         return 0;
 
     ret = fq_init(fq, 4096);
     if (ret)
         return ret;
 
     /*
      * If the hardware doesn't support VHT, it is safe to limit the maximum
      * queue size. 4 Mbytes is 64 max-size aggregates in 802.11n.
      */
     for (band = 0; band < NUM_NL80211_BANDS; band++) {
         struct ieee80211_supported_band *sband;
 
         sband = local->hw.wiphy->bands[band];
         if (!sband)
             continue;
 
         supp_vht = supp_vht || sband->vht_cap.vht_supported;
     }
 
     if (!supp_vht)
         fq->memory_limit = 4 << 20; /* 4 Mbytes */
 
     codel_params_init(&local->cparams);
     local->cparams.interval = MS2TIME(100);
     local->cparams.target = MS2TIME(20);
     local->cparams.ecn = true;
 
     local->cvars = kcalloc(fq->flows_cnt, sizeof(local->cvars[0]),
                    GFP_KERNEL);
     if (!local->cvars) {
         spin_lock_bh(&fq->lock);
         fq_reset(fq, fq_skb_free_func);
         spin_unlock_bh(&fq->lock);
         return -ENOMEM;
     }
 
     for (i = 0; i < fq->flows_cnt; i++)
         codel_vars_init(&local->cvars[i]);
 
     ieee80211_txq_set_params(local);
 
     return 0;
 }
 
 void ieee80211_txq_teardown_flows(struct ieee80211_local *local)
 {
     struct fq *fq = &local->fq;
 
     if (!local->ops->wake_tx_queue)
         return;
 
     kfree(local->cvars);
     local->cvars = NULL;
 
     spin_lock_bh(&fq->lock);
     fq_reset(fq, fq_skb_free_func);
     spin_unlock_bh(&fq->lock);
 }
 
 static bool ieee80211_queue_skb(struct ieee80211_local *local,
                 struct ieee80211_sub_if_data *sdata,
                 struct sta_info *sta,
                 struct sk_buff *skb)
 {
     struct ieee80211_vif *vif;
     struct txq_info *txqi;
 
     if (!local->ops->wake_tx_queue ||
         sdata->vif.type == NL80211_IFTYPE_MONITOR)
         return false;
 
     if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
         sdata = container_of(sdata->bss,
                      struct ieee80211_sub_if_data, u.ap);
 
     vif = &sdata->vif;
     txqi = ieee80211_get_txq(local, vif, sta, skb);
 
     if (!txqi)
         return false;
 
     ieee80211_txq_enqueue(local, txqi, skb);
 
     schedule_and_wake_txq(local, txqi);
 
     return true;
 }
 
 static bool ieee80211_tx_frags(struct ieee80211_local *local,
                    struct ieee80211_vif *vif,
                    struct sta_info *sta,
                    struct sk_buff_head *skbs,
                    bool txpending)
 {
     struct ieee80211_tx_control control = {};
     struct sk_buff *skb, *tmp;
     unsigned long flags;
 
     skb_queue_walk_safe(skbs, skb, tmp) {
         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
         int q = info->hw_queue;
 
 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
         if (WARN_ON_ONCE(q >= local->hw.queues)) {
             __skb_unlink(skb, skbs);
             ieee80211_free_txskb(&local->hw, skb);
             continue;
         }
 #endif
 
         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
         if (local->queue_stop_reasons[q] ||
             (!txpending && !skb_queue_empty(&local->pending[q]))) {
             if (unlikely(info->flags &
                      IEEE80211_TX_INTFL_OFFCHAN_TX_OK)) {
                 if (local->queue_stop_reasons[q] &
                     ~BIT(IEEE80211_QUEUE_STOP_REASON_OFFCHANNEL)) {
                     /*
                      * Drop off-channel frames if queues
                      * are stopped for any reason other
                      * than off-channel operation. Never
                      * queue them.
                      */
                     spin_unlock_irqrestore(
                         &local->queue_stop_reason_lock,
                         flags);
                     ieee80211_purge_tx_queue(&local->hw,
                                  skbs);
                     return true;
                 }
             } else {
 
                 /*
                  * Since queue is stopped, queue up frames for
                  * later transmission from the tx-pending
                  * tasklet when the queue is woken again.
                  */
                 if (txpending)
                     skb_queue_splice_init(skbs,
                                   &local->pending[q]);
                 else
                     skb_queue_splice_tail_init(skbs,
                                    &local->pending[q]);
 
                 spin_unlock_irqrestore(&local->queue_stop_reason_lock,
                                flags);
                 return false;
             }
         }
         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 
         info->control.vif = vif;
         control.sta = sta ? &sta->sta : NULL;
 
         __skb_unlink(skb, skbs);
         drv_tx(local, &control, skb);
     }
 
     return true;
 }
 
 /*
  * Returns false if the frame couldn't be transmitted but was queued instead.
  */
 static bool __ieee80211_tx(struct ieee80211_local *local,
                struct sk_buff_head *skbs, struct sta_info *sta,
                bool txpending)
 {
     struct ieee80211_tx_info *info;
     struct ieee80211_sub_if_data *sdata;
     struct ieee80211_vif *vif;
     struct sk_buff *skb;
     bool result;
 
     if (WARN_ON(skb_queue_empty(skbs)))
         return true;
 
     skb = skb_peek(skbs);
     info = IEEE80211_SKB_CB(skb);
     sdata = vif_to_sdata(info->control.vif);
     if (sta && !sta->uploaded)
         sta = NULL;
 
     switch (sdata->vif.type) {
     case NL80211_IFTYPE_MONITOR:
         if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
             vif = &sdata->vif;
             break;
         }
         sdata = rcu_dereference(local->monitor_sdata);
         if (sdata) {
             vif = &sdata->vif;
             info->hw_queue =
                 vif->hw_queue[skb_get_queue_mapping(skb)];
         } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
             ieee80211_purge_tx_queue(&local->hw, skbs);
             return true;
         } else
             vif = NULL;
         break;
     case NL80211_IFTYPE_AP_VLAN:
         sdata = container_of(sdata->bss,
                      struct ieee80211_sub_if_data, u.ap);
         fallthrough;
     default:
         vif = &sdata->vif;
         break;
     }
 
     result = ieee80211_tx_frags(local, vif, sta, skbs, txpending);
 
     WARN_ON_ONCE(!skb_queue_empty(skbs));
 
     return result;
 }
 
 /*
  * Invoke TX handlers, return 0 on success and non-zero if the
  * frame was dropped or queued.
  *
  * The handlers are split into an early and late part. The latter is everything
  * that can be sensitive to reordering, and will be deferred to after packets
  * are dequeued from the intermediate queues (when they are enabled).
  */
 static int invoke_tx_handlers_early(struct ieee80211_tx_data *tx)
 {
     ieee80211_tx_result res = TX_DROP;
 
 #define CALL_TXH(txh) \
     do {                \
         res = txh(tx);      \
         if (res != TX_CONTINUE) \
             goto txh_done;  \
     } while (0)
 
     CALL_TXH(ieee80211_tx_h_dynamic_ps);
     CALL_TXH(ieee80211_tx_h_check_assoc);
     CALL_TXH(ieee80211_tx_h_ps_buf);
     CALL_TXH(ieee80211_tx_h_check_control_port_protocol);
     CALL_TXH(ieee80211_tx_h_select_key);
 
  txh_done:
     if (unlikely(res == TX_DROP)) {
         I802_DEBUG_INC(tx->local->tx_handlers_drop);
         if (tx->skb)
             ieee80211_free_txskb(&tx->local->hw, tx->skb);
         else
             ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
         return -1;
     } else if (unlikely(res == TX_QUEUED)) {
         I802_DEBUG_INC(tx->local->tx_handlers_queued);
         return -1;
     }
 
     return 0;
 }
 
 /*
  * Late handlers can be called while the sta lock is held. Handlers that can
  * cause packets to be generated will cause deadlock!
  */
 static int invoke_tx_handlers_late(struct ieee80211_tx_data *tx)
 {
     struct ieee80211_tx_info *info = IEEE80211_SKB_CB(tx->skb);
     ieee80211_tx_result res = TX_CONTINUE;
 
     if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
         CALL_TXH(ieee80211_tx_h_rate_ctrl);
 
     if (unlikely(info->flags & IEEE80211_TX_INTFL_RETRANSMISSION)) {
         __skb_queue_tail(&tx->skbs, tx->skb);
         tx->skb = NULL;
         goto txh_done;
     }
 
     CALL_TXH(ieee80211_tx_h_michael_mic_add);
     CALL_TXH(ieee80211_tx_h_sequence);
     CALL_TXH(ieee80211_tx_h_fragment);
     /* handlers after fragment must be aware of tx info fragmentation! */
     CALL_TXH(ieee80211_tx_h_stats);
     CALL_TXH(ieee80211_tx_h_encrypt);
     if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL))
         CALL_TXH(ieee80211_tx_h_calculate_duration);
 #undef CALL_TXH
 
  txh_done:
     if (unlikely(res == TX_DROP)) {
         I802_DEBUG_INC(tx->local->tx_handlers_drop);
         if (tx->skb)
             ieee80211_free_txskb(&tx->local->hw, tx->skb);
         else
             ieee80211_purge_tx_queue(&tx->local->hw, &tx->skbs);
         return -1;
     } else if (unlikely(res == TX_QUEUED)) {
         I802_DEBUG_INC(tx->local->tx_handlers_queued);
         return -1;
     }
 
     return 0;
 }
 
 static int invoke_tx_handlers(struct ieee80211_tx_data *tx)
 {
     int r = invoke_tx_handlers_early(tx);
 
     if (r)
         return r;
     return invoke_tx_handlers_late(tx);
 }
 
 bool ieee80211_tx_prepare_skb(struct ieee80211_hw *hw,
                   struct ieee80211_vif *vif, struct sk_buff *skb,
                   int band, struct ieee80211_sta **sta)
 {
     struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
     struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
     struct ieee80211_tx_data tx;
     struct sk_buff *skb2;
 
     if (ieee80211_tx_prepare(sdata, &tx, NULL, skb) == TX_DROP)
         return false;
 
     info->band = band;
     info->control.vif = vif;
     info->hw_queue = vif->hw_queue[skb_get_queue_mapping(skb)];
 
     if (invoke_tx_handlers(&tx))
         return false;
 
     if (sta) {
         if (tx.sta)
             *sta = &tx.sta->sta;
         else
             *sta = NULL;
     }
 
     /* this function isn't suitable for fragmented data frames */
     skb2 = __skb_dequeue(&tx.skbs);
     if (WARN_ON(skb2 != skb || !skb_queue_empty(&tx.skbs))) {
         ieee80211_free_txskb(hw, skb2);
         ieee80211_purge_tx_queue(hw, &tx.skbs);
         return false;
     }
 
     return true;
 }
 EXPORT_SYMBOL(ieee80211_tx_prepare_skb);
 
 /*
  * Returns false if the frame couldn't be transmitted but was queued instead.
  */
 static bool ieee80211_tx(struct ieee80211_sub_if_data *sdata,
              struct sta_info *sta, struct sk_buff *skb,
              bool txpending)
 {
     struct ieee80211_local *local = sdata->local;
     struct ieee80211_tx_data tx;
     ieee80211_tx_result res_prepare;
     struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
     bool result = true;
 
     if (unlikely(skb->len < 10)) {
         dev_kfree_skb(skb);
         return true;
     }
 
     /* initialises tx */
     res_prepare = ieee80211_tx_prepare(sdata, &tx, sta, skb);
 
     if (unlikely(res_prepare == TX_DROP)) {
         ieee80211_free_txskb(&local->hw, skb);
         return true;
     } else if (unlikely(res_prepare == TX_QUEUED)) {
         return true;
     }
 
     /* set up hw_queue value early */
     if (!(info->flags & IEEE80211_TX_CTL_TX_OFFCHAN) ||
         !ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
         info->hw_queue =
             sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
 
     if (invoke_tx_handlers_early(&tx))
         return true;
 
     if (ieee80211_queue_skb(local, sdata, tx.sta, tx.skb))
         return true;
 
     if (!invoke_tx_handlers_late(&tx))
         result = __ieee80211_tx(local, &tx.skbs, tx.sta, txpending);
 
     return result;
 }
 
 /* device xmit handlers */
 
 enum ieee80211_encrypt {
     ENCRYPT_NO,
     ENCRYPT_MGMT,
     ENCRYPT_DATA,
 };
 
 static int ieee80211_skb_resize(struct ieee80211_sub_if_data *sdata,
                 struct sk_buff *skb,
                 int head_need,
                 enum ieee80211_encrypt encrypt)
 {
     struct ieee80211_local *local = sdata->local;
     bool enc_tailroom;
     int tail_need = 0;
 
     enc_tailroom = encrypt == ENCRYPT_MGMT ||
                (encrypt == ENCRYPT_DATA &&
             sdata->crypto_tx_tailroom_needed_cnt);
 
     if (enc_tailroom) {
         tail_need = IEEE80211_ENCRYPT_TAILROOM;
         tail_need -= skb_tailroom(skb);
         tail_need = max_t(int, tail_need, 0);
     }
 
     if (skb_cloned(skb) &&
         (!ieee80211_hw_check(&local->hw, SUPPORTS_CLONED_SKBS) ||
          !skb_clone_writable(skb, ETH_HLEN) || enc_tailroom))
         I802_DEBUG_INC(local->tx_expand_skb_head_cloned);
     else if (head_need || tail_need)
         I802_DEBUG_INC(local->tx_expand_skb_head);
     else
         return 0;
 
     if (pskb_expand_head(skb, head_need, tail_need, GFP_ATOMIC)) {
         wiphy_debug(local->hw.wiphy,
                 "failed to reallocate TX buffer\n");
         return -ENOMEM;
     }
 
     return 0;
 }
 
 void ieee80211_xmit(struct ieee80211_sub_if_data *sdata,
             struct sta_info *sta, struct sk_buff *skb)
 {
     struct ieee80211_local *local = sdata->local;
     struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
     struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
     int headroom;
     enum ieee80211_encrypt encrypt;
 
     if (info->flags & IEEE80211_TX_INTFL_DONT_ENCRYPT)
         encrypt = ENCRYPT_NO;
     else if (ieee80211_is_mgmt(hdr->frame_control))
         encrypt = ENCRYPT_MGMT;
     else
         encrypt = ENCRYPT_DATA;
 
     headroom = local->tx_headroom;
     if (encrypt != ENCRYPT_NO)
         headroom += IEEE80211_ENCRYPT_HEADROOM;
     headroom -= skb_headroom(skb);
     headroom = max_t(int, 0, headroom);
 
     if (ieee80211_skb_resize(sdata, skb, headroom, encrypt)) {
         ieee80211_free_txskb(&local->hw, skb);
         return;
     }
 
     /* reload after potential resize */
     hdr = (struct ieee80211_hdr *) skb->data;
     info->control.vif = &sdata->vif;
 
     if (ieee80211_vif_is_mesh(&sdata->vif)) {
         if (ieee80211_is_data(hdr->frame_control) &&
             is_unicast_ether_addr(hdr->addr1)) {
             if (mesh_nexthop_resolve(sdata, skb))
                 return; /* skb queued: don't free */
         } else {
             ieee80211_mps_set_frame_flags(sdata, NULL, hdr);
         }
     }
 
     ieee80211_set_qos_hdr(sdata, skb);
     ieee80211_tx(sdata, sta, skb, false);
 }
 
 static bool ieee80211_validate_radiotap_len(struct sk_buff *skb)
 {
     struct ieee80211_radiotap_header *rthdr =
         (struct ieee80211_radiotap_header *)skb->data;
 
     /* check for not even having the fixed radiotap header part */
     if (unlikely(skb->len < sizeof(struct ieee80211_radiotap_header)))
         return false; /* too short to be possibly valid */
 
     /* is it a header version we can trust to find length from? */
     if (unlikely(rthdr->it_version))
         return false; /* only version 0 is supported */
 
     /* does the skb contain enough to deliver on the alleged length? */
     if (unlikely(skb->len < ieee80211_get_radiotap_len(skb->data)))
         return false; /* skb too short for claimed rt header extent */
 
     return true;
 }
 
 bool ieee80211_parse_tx_radiotap(struct sk_buff *skb,
                  struct net_device *dev)
 {
     struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
     struct ieee80211_radiotap_iterator iterator;
     struct ieee80211_radiotap_header *rthdr =
         (struct ieee80211_radiotap_header *) skb->data;
     struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
     int ret = ieee80211_radiotap_iterator_init(&iterator, rthdr, skb->len,
                            NULL);
     u16 txflags;
     u16 rate = 0;
     bool rate_found = false;
     u8 rate_retries = 0;
     u16 rate_flags = 0;
     u8 mcs_known, mcs_flags, mcs_bw;
     u16 vht_known;
     u8 vht_mcs = 0, vht_nss = 0;
     int i;
 
     if (!ieee80211_validate_radiotap_len(skb))
         return false;
 
     info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT |
                IEEE80211_TX_CTL_DONTFRAG;
 
     /*
      * for every radiotap entry that is present
      * (ieee80211_radiotap_iterator_next returns -ENOENT when no more
      * entries present, or -EINVAL on error)
      */
 
     while (!ret) {
         ret = ieee80211_radiotap_iterator_next(&iterator);
 
         if (ret)
             continue;
 
         /* see if this argument is something we can use */
         switch (iterator.this_arg_index) {
         /*
          * You must take care when dereferencing iterator.this_arg
          * for multibyte types... the pointer is not aligned.  Use
          * get_unaligned((type *)iterator.this_arg) to dereference
          * iterator.this_arg for type "type" safely on all arches.
         */
         case IEEE80211_RADIOTAP_FLAGS:
             if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FCS) {
                 /*
                  * this indicates that the skb we have been
                  * handed has the 32-bit FCS CRC at the end...
                  * we should react to that by snipping it off
                  * because it will be recomputed and added
                  * on transmission
                  */
                 if (skb->len < (iterator._max_length + FCS_LEN))
                     return false;
 
                 skb_trim(skb, skb->len - FCS_LEN);
             }
             if (*iterator.this_arg & IEEE80211_RADIOTAP_F_WEP)
                 info->flags &= ~IEEE80211_TX_INTFL_DONT_ENCRYPT;
             if (*iterator.this_arg & IEEE80211_RADIOTAP_F_FRAG)
                 info->flags &= ~IEEE80211_TX_CTL_DONTFRAG;
             break;
 
         case IEEE80211_RADIOTAP_TX_FLAGS:
             txflags = get_unaligned_le16(iterator.this_arg);
             if (txflags & IEEE80211_RADIOTAP_F_TX_NOACK)
                 info->flags |= IEEE80211_TX_CTL_NO_ACK;
             if (txflags & IEEE80211_RADIOTAP_F_TX_NOSEQNO)
                 info->control.flags |= IEEE80211_TX_CTRL_NO_SEQNO;
             if (txflags & IEEE80211_RADIOTAP_F_TX_ORDER)
                 info->control.flags |=
                     IEEE80211_TX_CTRL_DONT_REORDER;
             break;
 
         case IEEE80211_RADIOTAP_RATE:
             rate = *iterator.this_arg;
             rate_flags = 0;
             rate_found = true;
             break;
 
         case IEEE80211_RADIOTAP_DATA_RETRIES:
             rate_retries = *iterator.this_arg;
             break;
 
         case IEEE80211_RADIOTAP_MCS:
             mcs_known = iterator.this_arg[0];
             mcs_flags = iterator.this_arg[1];
             if (!(mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_MCS))
                 break;
 
             rate_found = true;
             rate = iterator.this_arg[2];
             rate_flags = IEEE80211_TX_RC_MCS;
 
             if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_GI &&
                 mcs_flags & IEEE80211_RADIOTAP_MCS_SGI)
                 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
 
             mcs_bw = mcs_flags & IEEE80211_RADIOTAP_MCS_BW_MASK;
             if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_BW &&
                 mcs_bw == IEEE80211_RADIOTAP_MCS_BW_40)
                 rate_flags |= IEEE80211_TX_RC_40_MHZ_WIDTH;
 
             if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_FEC &&
                 mcs_flags & IEEE80211_RADIOTAP_MCS_FEC_LDPC)
                 info->flags |= IEEE80211_TX_CTL_LDPC;
 
             if (mcs_known & IEEE80211_RADIOTAP_MCS_HAVE_STBC) {
                 u8 stbc = u8_get_bits(mcs_flags,
                               IEEE80211_RADIOTAP_MCS_STBC_MASK);
 
                 info->flags |=
                     u32_encode_bits(stbc,
                             IEEE80211_TX_CTL_STBC);
             }
             break;
 
         case IEEE80211_RADIOTAP_VHT:
             vht_known = get_unaligned_le16(iterator.this_arg);
             rate_found = true;
 
             rate_flags = IEEE80211_TX_RC_VHT_MCS;
             if ((vht_known & IEEE80211_RADIOTAP_VHT_KNOWN_GI) &&
                 (iterator.this_arg[2] &
                  IEEE80211_RADIOTAP_VHT_FLAG_SGI))
                 rate_flags |= IEEE80211_TX_RC_SHORT_GI;
             if (vht_known &
                 IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH) {
                 if (iterator.this_arg[3] == 1)
                     rate_flags |=
                         IEEE80211_TX_RC_40_MHZ_WIDTH;
                 else if (iterator.this_arg[3] == 4)
                     rate_flags |=
                         IEEE80211_TX_RC_80_MHZ_WIDTH;
                 else if (iterator.this_arg[3] == 11)
                     rate_flags |=
                         IEEE80211_TX_RC_160_MHZ_WIDTH;
             }
 
             vht_mcs = iterator.this_arg[4] >> 4;
             if (vht_mcs > 11)
                 vht_mcs = 0;
             vht_nss = iterator.this_arg[4] & 0xF;
             if (!vht_nss || vht_nss > 8)
                 vht_nss = 1;
             break;
 
         /*
          * Please update the file
          * Documentation/networking/mac80211-injection.rst
          * when parsing new fields here.
          */
 
         default:
             break;
         }
     }
 
     if (ret != -ENOENT) /* ie, if we didn't simply run out of fields */
         return false;
 
     if (rate_found) {
         struct ieee80211_supported_band *sband =
             local->hw.wiphy->bands[info->band];
 
         info->control.flags |= IEEE80211_TX_CTRL_RATE_INJECT;
 
         for (i = 0; i < IEEE80211_TX_MAX_RATES; i++) {
             info->control.rates[i].idx = -1;
             info->control.rates[i].flags = 0;
             info->control.rates[i].count = 0;
         }
 
         if (rate_flags & IEEE80211_TX_RC_MCS) {
             info->control.rates[0].idx = rate;
         } else if (rate_flags & IEEE80211_TX_RC_VHT_MCS) {
             ieee80211_rate_set_vht(info->control.rates, vht_mcs,
                            vht_nss);
         } else if (sband) {
             for (i = 0; i < sband->n_bitrates; i++) {
                 if (rate * 5 != sband->bitrates[i].bitrate)
                     continue;
 
                 info->control.rates[0].idx = i;
                 break;
             }
         }
 
         if (info->control.rates[0].idx < 0)
             info->control.flags &= ~IEEE80211_TX_CTRL_RATE_INJECT;
 
         info->control.rates[0].flags = rate_flags;
         info->control.rates[0].count = min_t(u8, rate_retries + 1,
                              local->hw.max_rate_tries);
     }
 
     return true;
 }
 
 netdev_tx_t ieee80211_monitor_start_xmit(struct sk_buff *skb,
                      struct net_device *dev)
 {
     struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
     struct ieee80211_chanctx_conf *chanctx_conf;
     struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
     struct ieee80211_hdr *hdr;
     struct ieee80211_sub_if_data *tmp_sdata, *sdata;
     struct cfg80211_chan_def *chandef;
     u16 len_rthdr;
     int hdrlen;
 
     memset(info, 0, sizeof(*info));
     info->flags = IEEE80211_TX_CTL_REQ_TX_STATUS |
               IEEE80211_TX_CTL_INJECTED;
 
     /* Sanity-check the length of the radiotap header */
     if (!ieee80211_validate_radiotap_len(skb))
         goto fail;
 
     /* we now know there is a radiotap header with a length we can use */
     len_rthdr = ieee80211_get_radiotap_len(skb->data);
 
     /*
      * fix up the pointers accounting for the radiotap
      * header still being in there.  We are being given
      * a precooked IEEE80211 header so no need for
      * normal processing
      */
     skb_set_mac_header(skb, len_rthdr);
     /*
      * these are just fixed to the end of the rt area since we
      * don't have any better information and at this point, nobody cares
      */
     skb_set_network_header(skb, len_rthdr);
     skb_set_transport_header(skb, len_rthdr);
 
     if (skb->len < len_rthdr + 2)
         goto fail;
 
     hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
     hdrlen = ieee80211_hdrlen(hdr->frame_control);
 
     if (skb->len < len_rthdr + hdrlen)
         goto fail;
 
     /*
      * Initialize skb->protocol if the injected frame is a data frame
      * carrying a rfc1042 header
      */
     if (ieee80211_is_data(hdr->frame_control) &&
         skb->len >= len_rthdr + hdrlen + sizeof(rfc1042_header) + 2) {
         u8 *payload = (u8 *)hdr + hdrlen;
 
         if (ether_addr_equal(payload, rfc1042_header))
             skb->protocol = cpu_to_be16((payload[6] << 8) |
                             payload[7]);
     }
 
     rcu_read_lock();
 
     /*
      * We process outgoing injected frames that have a local address
      * we handle as though they are non-injected frames.
      * This code here isn't entirely correct, the local MAC address
      * isn't always enough to find the interface to use; for proper
      * VLAN support we have an nl80211-based mechanism.
      *
      * This is necessary, for example, for old hostapd versions that
      * don't use nl80211-based management TX/RX.
      */
     sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 
     list_for_each_entry_rcu(tmp_sdata, &local->interfaces, list) {
         if (!ieee80211_sdata_running(tmp_sdata))
             continue;
         if (tmp_sdata->vif.type == NL80211_IFTYPE_MONITOR ||
             tmp_sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
             continue;
         if (ether_addr_equal(tmp_sdata->vif.addr, hdr->addr2)) {
             sdata = tmp_sdata;
             break;
         }
     }
 
     chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
     if (!chanctx_conf) {
         tmp_sdata = rcu_dereference(local->monitor_sdata);
         if (tmp_sdata)
             chanctx_conf =
                 rcu_dereference(tmp_sdata->vif.bss_conf.chanctx_conf);
     }
 
     if (chanctx_conf)
         chandef = &chanctx_conf->def;
     else if (!local->use_chanctx)
         chandef = &local->_oper_chandef;
     else
         goto fail_rcu;
 
     /*
      * Frame injection is not allowed if beaconing is not allowed
      * or if we need radar detection. Beaconing is usually not allowed when
      * the mode or operation (Adhoc, AP, Mesh) does not support DFS.
      * Passive scan is also used in world regulatory domains where
      * your country is not known and as such it should be treated as
      * NO TX unless the channel is explicitly allowed in which case
      * your current regulatory domain would not have the passive scan
      * flag.
      *
      * Since AP mode uses monitor interfaces to inject/TX management
      * frames we can make AP mode the exception to this rule once it
      * supports radar detection as its implementation can deal with
      * radar detection by itself. We can do that later by adding a
      * monitor flag interfaces used for AP support.
      */
     if (!cfg80211_reg_can_beacon(local->hw.wiphy, chandef,
                      sdata->vif.type))
         goto fail_rcu;
 
     info->band = chandef->chan->band;
 
     /* Initialize skb->priority according to frame type and TID class,
      * with respect to the sub interface that the frame will actually
      * be transmitted on. If the DONT_REORDER flag is set, the original
      * skb-priority is preserved to assure frames injected with this
      * flag are not reordered relative to each other.
      */
     ieee80211_select_queue_80211(sdata, skb, hdr);
     skb_set_queue_mapping(skb, ieee80211_ac_from_tid(skb->priority));
 
     /*
      * Process the radiotap header. This will now take into account the
      * selected chandef above to accurately set injection rates and
      * retransmissions.
      */
     if (!ieee80211_parse_tx_radiotap(skb, dev))
         goto fail_rcu;
 
     /* remove the injection radiotap header */
     skb_pull(skb, len_rthdr);
 
     ieee80211_xmit(sdata, NULL, skb);
     rcu_read_unlock();
 
     return NETDEV_TX_OK;
 
 fail_rcu:
     rcu_read_unlock();
 fail:
     dev_kfree_skb(skb);
     return NETDEV_TX_OK; /* meaning, we dealt with the skb */
 }
 
 static inline bool ieee80211_is_tdls_setup(struct sk_buff *skb)
 {
     u16 ethertype = (skb->data[12] << 8) | skb->data[13];
 
     return ethertype == ETH_P_TDLS &&
            skb->len > 14 &&
            skb->data[14] == WLAN_TDLS_SNAP_RFTYPE;
 }
 
 int ieee80211_lookup_ra_sta(struct ieee80211_sub_if_data *sdata,
                 struct sk_buff *skb,
                 struct sta_info **sta_out)
 {
     struct sta_info *sta;
 
     switch (sdata->vif.type) {
     case NL80211_IFTYPE_AP_VLAN:
         sta = rcu_dereference(sdata->u.vlan.sta);
         if (sta) {
             *sta_out = sta;
             return 0;
         } else if (sdata->wdev.use_4addr) {
             return -ENOLINK;
         }
         fallthrough;
     case NL80211_IFTYPE_AP:
     case NL80211_IFTYPE_OCB:
     case NL80211_IFTYPE_ADHOC:
         if (is_multicast_ether_addr(skb->data)) {
             *sta_out = ERR_PTR(-ENOENT);
             return 0;
         }
         sta = sta_info_get_bss(sdata, skb->data);
         break;
 #ifdef CONFIG_MAC80211_MESH
     case NL80211_IFTYPE_MESH_POINT:
         /* determined much later */
         *sta_out = NULL;
         return 0;
 #endif
     case NL80211_IFTYPE_STATION:
         if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
             sta = sta_info_get(sdata, skb->data);
             if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
                 if (test_sta_flag(sta,
                           WLAN_STA_TDLS_PEER_AUTH)) {
                     *sta_out = sta;
                     return 0;
                 }
 
                 /*
                  * TDLS link during setup - throw out frames to
                  * peer. Allow TDLS-setup frames to unauthorized
                  * peers for the special case of a link teardown
                  * after a TDLS sta is removed due to being
                  * unreachable.
                  */
                 if (!ieee80211_is_tdls_setup(skb))
                     return -EINVAL;
             }
 
         }
 
         sta = sta_info_get(sdata, sdata->vif.cfg.ap_addr);
         if (!sta)
             return -ENOLINK;
         break;
     default:
         return -EINVAL;
     }
 
     *sta_out = sta ?: ERR_PTR(-ENOENT);
     return 0;
 }
 
 static u16 ieee80211_store_ack_skb(struct ieee80211_local *local,
                    struct sk_buff *skb,
                    u32 *info_flags,
                    u64 *cookie)
 {
     struct sk_buff *ack_skb;
     u16 info_id = 0;
 
     if (skb->sk)
         ack_skb = skb_clone_sk(skb);
     else
         ack_skb = skb_clone(skb, GFP_ATOMIC);
 
     if (ack_skb) {
         unsigned long flags;
         int id;
 
         spin_lock_irqsave(&local->ack_status_lock, flags);
         id = idr_alloc(&local->ack_status_frames, ack_skb,
                    1, 0x2000, GFP_ATOMIC);
         spin_unlock_irqrestore(&local->ack_status_lock, flags);
 
         if (id >= 0) {
             info_id = id;
             *info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
             if (cookie) {
                 *cookie = ieee80211_mgmt_tx_cookie(local);
                 IEEE80211_SKB_CB(ack_skb)->ack.cookie = *cookie;
             }
         } else {
             kfree_skb(ack_skb);
         }
     }
 
     return info_id;
 }
 
 /**
  * ieee80211_build_hdr - build 802.11 header in the given frame
  * @sdata: virtual interface to build the header for
  * @skb: the skb to build the header in
  * @info_flags: skb flags to set
  * @sta: the station pointer
  * @ctrl_flags: info control flags to set
  * @cookie: cookie pointer to fill (if not %NULL)
  *
  * This function takes the skb with 802.3 header and reformats the header to
  * the appropriate IEEE 802.11 header based on which interface the packet is
  * being transmitted on.
  *
  * Note that this function also takes care of the TX status request and
  * potential unsharing of the SKB - this needs to be interleaved with the
  * header building.
  *
  * The function requires the read-side RCU lock held
  *
  * Returns: the (possibly reallocated) skb or an ERR_PTR() code
  */
 static struct sk_buff *ieee80211_build_hdr(struct ieee80211_sub_if_data *sdata,
                        struct sk_buff *skb, u32 info_flags,
                        struct sta_info *sta, u32 ctrl_flags,
                        u64 *cookie)
 {
     struct ieee80211_local *local = sdata->local;
     struct ieee80211_tx_info *info;
     int head_need;
     u16 ethertype, hdrlen,  meshhdrlen = 0;
     __le16 fc;
     struct ieee80211_hdr hdr;
     struct ieee80211s_hdr mesh_hdr __maybe_unused;
     struct mesh_path __maybe_unused *mppath = NULL, *mpath = NULL;
     const u8 *encaps_data;
     int encaps_len, skip_header_bytes;
     bool wme_sta = false, authorized = false;
     bool tdls_peer;
     bool multicast;
     u16 info_id = 0;
     struct ieee80211_chanctx_conf *chanctx_conf = NULL;
     enum nl80211_band band;
     int ret;
     u8 link_id = u32_get_bits(ctrl_flags, IEEE80211_TX_CTRL_MLO_LINK);
 
     if (IS_ERR(sta))
         sta = NULL;
 
 #ifdef CONFIG_MAC80211_DEBUGFS
     if (local->force_tx_status)
         info_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 #endif
 
     /* convert Ethernet header to proper 802.11 header (based on
      * operation mode) */
     ethertype = (skb->data[12] << 8) | skb->data[13];
     fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
 
     if (!sdata->vif.valid_links)
         chanctx_conf =
             rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
 
     switch (sdata->vif.type) {
     case NL80211_IFTYPE_AP_VLAN:
         if (sdata->wdev.use_4addr) {
             fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS);
             /* RA TA DA SA */
             memcpy(hdr.addr1, sta->sta.addr, ETH_ALEN);
             memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
             memcpy(hdr.addr3, skb->data, ETH_ALEN);
             memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
             hdrlen = 30;
             authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
             wme_sta = sta->sta.wme;
         }
         if (!sdata->vif.valid_links) {
             struct ieee80211_sub_if_data *ap_sdata;
 
             /* override chanctx_conf from AP (we don't have one) */
             ap_sdata = container_of(sdata->bss,
                         struct ieee80211_sub_if_data,
                         u.ap);
             chanctx_conf =
                 rcu_dereference(ap_sdata->vif.bss_conf.chanctx_conf);
         }
         if (sdata->wdev.use_4addr)
             break;
         fallthrough;
     case NL80211_IFTYPE_AP:
         fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
         /* DA BSSID SA */
         memcpy(hdr.addr1, skb->data, ETH_ALEN);
 
         if (sdata->vif.valid_links && sta && !sta->sta.mlo) {
             struct ieee80211_link_data *link;
 
             link_id = sta->deflink.link_id;
             link = rcu_dereference(sdata->link[link_id]);
             if (WARN_ON(!link)) {
                 ret = -ENOLINK;
                 goto free;
             }
             memcpy(hdr.addr2, link->conf->addr, ETH_ALEN);
         } else if (link_id == IEEE80211_LINK_UNSPECIFIED) {
             memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
         } else {
             struct ieee80211_bss_conf *conf;
 
             conf = rcu_dereference(sdata->vif.link_conf[link_id]);
             if (unlikely(!conf)) {
                 ret = -ENOLINK;
                 goto free;
             }
 
             memcpy(hdr.addr2, conf->addr, ETH_ALEN);
         }
 
         memcpy(hdr.addr3, skb->data + ETH_ALEN, ETH_ALEN);
         hdrlen = 24;
         break;
 #ifdef CONFIG_MAC80211_MESH
     case NL80211_IFTYPE_MESH_POINT:
         if (!is_multicast_ether_addr(skb->data)) {
             struct sta_info *next_hop;
             bool mpp_lookup = true;
 
             mpath = mesh_path_lookup(sdata, skb->data);
             if (mpath) {
                 mpp_lookup = false;
                 next_hop = rcu_dereference(mpath->next_hop);
                 if (!next_hop ||
                     !(mpath->flags & (MESH_PATH_ACTIVE |
                               MESH_PATH_RESOLVING)))
                     mpp_lookup = true;
             }
 
             if (mpp_lookup) {
                 mppath = mpp_path_lookup(sdata, skb->data);
                 if (mppath)
                     mppath->exp_time = jiffies;
             }
 
             if (mppath && mpath)
                 mesh_path_del(sdata, mpath->dst);
         }
 
         /*
          * Use address extension if it is a packet from
          * another interface or if we know the destination
          * is being proxied by a portal (i.e. portal address
          * differs from proxied address)
          */
         if (ether_addr_equal(sdata->vif.addr, skb->data + ETH_ALEN) &&
             !(mppath && !ether_addr_equal(mppath->mpp, skb->data))) {
             hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
                     skb->data, skb->data + ETH_ALEN);
             meshhdrlen = ieee80211_new_mesh_header(sdata, &mesh_hdr,
                                    NULL, NULL);
         } else {
             /* DS -> MBSS (802.11-2012 13.11.3.3).
              * For unicast with unknown forwarding information,
              * destination might be in the MBSS or if that fails
              * forwarded to another mesh gate. In either case
              * resolution will be handled in ieee80211_xmit(), so
              * leave the original DA. This also works for mcast */
             const u8 *mesh_da = skb->data;
 
             if (mppath)
                 mesh_da = mppath->mpp;
             else if (mpath)
                 mesh_da = mpath->dst;
 
             hdrlen = ieee80211_fill_mesh_addresses(&hdr, &fc,
                     mesh_da, sdata->vif.addr);
             if (is_multicast_ether_addr(mesh_da))
                 /* DA TA mSA AE:SA */
                 meshhdrlen = ieee80211_new_mesh_header(
                         sdata, &mesh_hdr,
                         skb->data + ETH_ALEN, NULL);
             else
                 /* RA TA mDA mSA AE:DA SA */
                 meshhdrlen = ieee80211_new_mesh_header(
                         sdata, &mesh_hdr, skb->data,
                         skb->data + ETH_ALEN);
 
         }
 
         /* For injected frames, fill RA right away as nexthop lookup
          * will be skipped.
          */
         if ((ctrl_flags & IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP) &&
             is_zero_ether_addr(hdr.addr1))
             memcpy(hdr.addr1, skb->data, ETH_ALEN);
         break;
 #endif
     case NL80211_IFTYPE_STATION:
         /* we already did checks when looking up the RA STA */
         tdls_peer = test_sta_flag(sta, WLAN_STA_TDLS_PEER);
 
         if (tdls_peer) {
             /* DA SA BSSID */
             memcpy(hdr.addr1, skb->data, ETH_ALEN);
             memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
             memcpy(hdr.addr3, sdata->deflink.u.mgd.bssid, ETH_ALEN);
             hdrlen = 24;
         }  else if (sdata->u.mgd.use_4addr &&
                 cpu_to_be16(ethertype) != sdata->control_port_protocol) {
             fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
                       IEEE80211_FCTL_TODS);
             /* RA TA DA SA */
             memcpy(hdr.addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN);
             memcpy(hdr.addr2, sdata->vif.addr, ETH_ALEN);
             memcpy(hdr.addr3, skb->data, ETH_ALEN);
             memcpy(hdr.addr4, skb->data + ETH_ALEN, ETH_ALEN);
             hdrlen = 30;
         } else {
             fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
             /* BSSID SA DA */
             memcpy(hdr.addr1, sdata->vif.cfg.ap_addr, ETH_ALEN);
             memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
             memcpy(hdr.addr3, skb->data, ETH_ALEN);
             hdrlen = 24;
         }
         break;
     case NL80211_IFTYPE_OCB:
         /* DA SA BSSID */
         memcpy(hdr.addr1, skb->data, ETH_ALEN);
         memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
         eth_broadcast_addr(hdr.addr3);
         hdrlen = 24;
         break;
     case NL80211_IFTYPE_ADHOC:
         /* DA SA BSSID */
         memcpy(hdr.addr1, skb->data, ETH_ALEN);
         memcpy(hdr.addr2, skb->data + ETH_ALEN, ETH_ALEN);
         memcpy(hdr.addr3, sdata->u.ibss.bssid, ETH_ALEN);
         hdrlen = 24;
         break;
     default:
         ret = -EINVAL;
         goto free;
     }
 
     if (!chanctx_conf) {
         if (!sdata->vif.valid_links) {
             ret = -ENOTCONN;
             goto free;
         }
         /* MLD transmissions must not rely on the band */
         band = 0;
     } else {
         band = chanctx_conf->def.chan->band;
     }
 
     multicast = is_multicast_ether_addr(hdr.addr1);
 
     /* sta is always NULL for mesh */
     if (sta) {
         authorized = test_sta_flag(sta, WLAN_STA_AUTHORIZED);
         wme_sta = sta->sta.wme;
     } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
         /* For mesh, the use of the QoS header is mandatory */
         wme_sta = true;
     }
 
     /* receiver does QoS (which also means we do) use it */
     if (wme_sta) {
         fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
         hdrlen += 2;
     }
 
     /*
      * Drop unicast frames to unauthorised stations unless they are
      * EAPOL frames from the local station.
      */
     if (unlikely(!ieee80211_vif_is_mesh(&sdata->vif) &&
              (sdata->vif.type != NL80211_IFTYPE_OCB) &&
              !multicast && !authorized &&
              (cpu_to_be16(ethertype) != sdata->control_port_protocol ||
               !ieee80211_is_our_addr(sdata, skb->data + ETH_ALEN, NULL)))) {
 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
         net_info_ratelimited("%s: dropped frame to %pM (unauthorized port)\n",
                     sdata->name, hdr.addr1);
 #endif
 
         I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
 
         ret = -EPERM;
         goto free;
     }
 
     if (unlikely(!multicast && ((skb->sk &&
              skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS) ||
              ctrl_flags & IEEE80211_TX_CTL_REQ_TX_STATUS)))
         info_id = ieee80211_store_ack_skb(local, skb, &info_flags,
                           cookie);
 
     /*
      * If the skb is shared we need to obtain our own copy.
      */
     skb = skb_share_check(skb, GFP_ATOMIC);
     if (unlikely(!skb)) {
         ret = -ENOMEM;
         goto free;
     }
 
     hdr.frame_control = fc;
     hdr.duration_id = 0;
     hdr.seq_ctrl = 0;
 
     skip_header_bytes = ETH_HLEN;
     if (ethertype == ETH_P_AARP || ethertype == ETH_P_IPX) {
         encaps_data = bridge_tunnel_header;
         encaps_len = sizeof(bridge_tunnel_header);
         skip_header_bytes -= 2;
     } else if (ethertype >= ETH_P_802_3_MIN) {
         encaps_data = rfc1042_header;
         encaps_len = sizeof(rfc1042_header);
         skip_header_bytes -= 2;
     } else {
         encaps_data = NULL;
         encaps_len = 0;
     }
 
     skb_pull(skb, skip_header_bytes);
     head_need = hdrlen + encaps_len + meshhdrlen - skb_headroom(skb);
 
     /*
      * So we need to modify the skb header and hence need a copy of
      * that. The head_need variable above doesn't, so far, include
      * the needed header space that we don't need right away. If we
      * can, then we don't reallocate right now but only after the
      * frame arrives at the master device (if it does...)
      *
      * If we cannot, however, then we will reallocate to include all
      * the ever needed space. Also, if we need to reallocate it anyway,
      * make it big enough for everything we may ever need.
      */
 
     if (head_need > 0 || skb_cloned(skb)) {
         head_need += IEEE80211_ENCRYPT_HEADROOM;
         head_need += local->tx_headroom;
         head_need = max_t(int, 0, head_need);
         if (ieee80211_skb_resize(sdata, skb, head_need, ENCRYPT_DATA)) {
             ieee80211_free_txskb(&local->hw, skb);
             skb = NULL;
             return ERR_PTR(-ENOMEM);
         }
     }
 
     if (encaps_data)
         memcpy(skb_push(skb, encaps_len), encaps_data, encaps_len);
 
 #ifdef CONFIG_MAC80211_MESH
     if (meshhdrlen > 0)
         memcpy(skb_push(skb, meshhdrlen), &mesh_hdr, meshhdrlen);
 #endif
 
     if (ieee80211_is_data_qos(fc)) {
         __le16 *qos_control;
 
         qos_control = skb_push(skb, 2);
         memcpy(skb_push(skb, hdrlen - 2), &hdr, hdrlen - 2);
         /*
          * Maybe we could actually set some fields here, for now just
          * initialise to zero to indicate no special operation.
          */
         *qos_control = 0;
     } else
         memcpy(skb_push(skb, hdrlen), &hdr, hdrlen);
 
     skb_reset_mac_header(skb);
 
     info = IEEE80211_SKB_CB(skb);
     memset(info, 0, sizeof(*info));
 
     info->flags = info_flags;
     info->ack_frame_id = info_id;
     info->band = band;
 
     if (likely(!cookie)) {
         ctrl_flags |= u32_encode_bits(link_id,
                           IEEE80211_TX_CTRL_MLO_LINK);
     } else {
         unsigned int pre_conf_link_id;
 
         /*
          * ctrl_flags already have been set by
          * ieee80211_tx_control_port(), here
          * we just sanity check that
          */
 
         pre_conf_link_id = u32_get_bits(ctrl_flags,
                         IEEE80211_TX_CTRL_MLO_LINK);
 
         if (pre_conf_link_id != link_id &&
             link_id != IEEE80211_LINK_UNSPECIFIED) {
 #ifdef CPTCFG_MAC80211_VERBOSE_DEBUG
             net_info_ratelimited("%s: dropped frame to %pM with bad link ID request (%d vs. %d)\n",
                          sdata->name, hdr.addr1,
                          pre_conf_link_id, link_id);
 #endif
             ret = -EINVAL;
             goto free;
         }
     }
 
     info->control.flags = ctrl_flags;
 
     return skb;
  free:
     kfree_skb(skb);
     return ERR_PTR(ret);
 }
 
 /*
  * fast-xmit overview
  *
  * The core idea of this fast-xmit is to remove per-packet checks by checking
  * them out of band. ieee80211_check_fast_xmit() implements the out-of-band
  * checks that are needed to get the sta->fast_tx pointer assigned, after which
  * much less work can be done per packet. For example, fragmentation must be
  * disabled or the fast_tx pointer will not be set. All the conditions are seen
  * in the code here.
  *
  * Once assigned, the fast_tx data structure also caches the per-packet 802.11
  * header and other data to aid packet processing in ieee80211_xmit_fast().
  *
  * The most difficult part of this is that when any of these assumptions
  * change, an external trigger (i.e. a call to ieee80211_clear_fast_xmit(),
  * ieee80211_check_fast_xmit() or friends) is required to reset the data,
  * since the per-packet code no longer checks the conditions. This is reflected
  * by the calls to these functions throughout the rest of the code, and must be
  * maintained if any of the TX path checks change.
  */
 
 void ieee80211_check_fast_xmit(struct sta_info *sta)
 {
     struct ieee80211_fast_tx build = {}, *fast_tx = NULL, *old;
     struct ieee80211_local *local = sta->local;
     struct ieee80211_sub_if_data *sdata = sta->sdata;
     struct ieee80211_hdr *hdr = (void *)build.hdr;
     struct ieee80211_chanctx_conf *chanctx_conf;
     __le16 fc;
 
     if (!ieee80211_hw_check(&local->hw, SUPPORT_FAST_XMIT))
         return;
 
     /* Locking here protects both the pointer itself, and against concurrent
      * invocations winning data access races to, e.g., the key pointer that
      * is used.
      * Without it, the invocation of this function right after the key
      * pointer changes wouldn't be sufficient, as another CPU could access
      * the pointer, then stall, and then do the cache update after the CPU
      * that invalidated the key.
      * With the locking, such scenarios cannot happen as the check for the
      * key and the fast-tx assignment are done atomically, so the CPU that
      * modifies the key will either wait or other one will see the key
      * cleared/changed already.
      */
     spin_lock_bh(&sta->lock);
     if (ieee80211_hw_check(&local->hw, SUPPORTS_PS) &&
         !ieee80211_hw_check(&local->hw, SUPPORTS_DYNAMIC_PS) &&
         sdata->vif.type == NL80211_IFTYPE_STATION)
         goto out;
 
     if (!test_sta_flag(sta, WLAN_STA_AUTHORIZED))
         goto out;
 
     if (test_sta_flag(sta, WLAN_STA_PS_STA) ||
         test_sta_flag(sta, WLAN_STA_PS_DRIVER) ||
         test_sta_flag(sta, WLAN_STA_PS_DELIVER) ||
         test_sta_flag(sta, WLAN_STA_CLEAR_PS_FILT))
         goto out;
 
     if (sdata->noack_map)
         goto out;
 
     /* fast-xmit doesn't handle fragmentation at all */
     if (local->hw.wiphy->frag_threshold != (u32)-1 &&
         !ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG))
         goto out;
 
     if (!sdata->vif.valid_links) {
         rcu_read_lock();
         chanctx_conf =
             rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
         if (!chanctx_conf) {
             rcu_read_unlock();
             goto out;
         }
         build.band = chanctx_conf->def.chan->band;
         rcu_read_unlock();
     } else {
         /* MLD transmissions must not rely on the band */
         build.band = 0;
     }
 
     fc = cpu_to_le16(IEEE80211_FTYPE_DATA | IEEE80211_STYPE_DATA);
 
     switch (sdata->vif.type) {
     case NL80211_IFTYPE_ADHOC:
         /* DA SA BSSID */
         build.da_offs = offsetof(struct ieee80211_hdr, addr1);
         build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
         memcpy(hdr->addr3, sdata->u.ibss.bssid, ETH_ALEN);
         build.hdr_len = 24;
         break;
     case NL80211_IFTYPE_STATION:
         if (test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
             /* DA SA BSSID */
             build.da_offs = offsetof(struct ieee80211_hdr, addr1);
             build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
             memcpy(hdr->addr3, sdata->deflink.u.mgd.bssid, ETH_ALEN);
             build.hdr_len = 24;
             break;
         }
 
         if (sdata->u.mgd.use_4addr) {
             /* non-regular ethertype cannot use the fastpath */
             fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
                       IEEE80211_FCTL_TODS);
             /* RA TA DA SA */
             memcpy(hdr->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN);
             memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
             build.da_offs = offsetof(struct ieee80211_hdr, addr3);
             build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
             build.hdr_len = 30;
             break;
         }
         fc |= cpu_to_le16(IEEE80211_FCTL_TODS);
         /* BSSID SA DA */
         memcpy(hdr->addr1, sdata->vif.cfg.ap_addr, ETH_ALEN);
         build.da_offs = offsetof(struct ieee80211_hdr, addr3);
         build.sa_offs = offsetof(struct ieee80211_hdr, addr2);
         build.hdr_len = 24;
         break;
     case NL80211_IFTYPE_AP_VLAN:
         if (sdata->wdev.use_4addr) {
             fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS |
                       IEEE80211_FCTL_TODS);
             /* RA TA DA SA */
             memcpy(hdr->addr1, sta->sta.addr, ETH_ALEN);
             memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
             build.da_offs = offsetof(struct ieee80211_hdr, addr3);
             build.sa_offs = offsetof(struct ieee80211_hdr, addr4);
             build.hdr_len = 30;
             break;
         }
         fallthrough;
     case NL80211_IFTYPE_AP:
         fc |= cpu_to_le16(IEEE80211_FCTL_FROMDS);
         /* DA BSSID SA */
         build.da_offs = offsetof(struct ieee80211_hdr, addr1);
         if (sta->sta.mlo || !sdata->vif.valid_links) {
             memcpy(hdr->addr2, sdata->vif.addr, ETH_ALEN);
         } else {
             unsigned int link_id = sta->deflink.link_id;
             struct ieee80211_link_data *link;
 
             rcu_read_lock();
             link = rcu_dereference(sdata->link[link_id]);
             if (WARN_ON(!link)) {
                 rcu_read_unlock();
                 goto out;
             }
             memcpy(hdr->addr2, link->conf->addr, ETH_ALEN);
             rcu_read_unlock();
         }
         build.sa_offs = offsetof(struct ieee80211_hdr, addr3);
         build.hdr_len = 24;
         break;
     default:
         /* not handled on fast-xmit */
         goto out;
     }
 
     if (sta->sta.wme) {
         build.hdr_len += 2;
         fc |= cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
     }
 
     /* We store the key here so there's no point in using rcu_dereference()
      * but that's fine because the code that changes the pointers will call
      * this function after doing so. For a single CPU that would be enough,
      * for multiple see the comment above.
      */
     build.key = rcu_access_pointer(sta->ptk[sta->ptk_idx]);
     if (!build.key)
         build.key = rcu_access_pointer(sdata->default_unicast_key);
     if (build.key) {
         bool gen_iv, iv_spc, mmic;
 
         gen_iv = build.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV;
         iv_spc = build.key->conf.flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE;
         mmic = build.key->conf.flags &
             (IEEE80211_KEY_FLAG_GENERATE_MMIC |
              IEEE80211_KEY_FLAG_PUT_MIC_SPACE);
 
         /* don't handle software crypto */
         if (!(build.key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
             goto out;
 
         /* Key is being removed */
         if (build.key->flags & KEY_FLAG_TAINTED)
             goto out;
 
         switch (build.key->conf.cipher) {
         case WLAN_CIPHER_SUITE_CCMP:
         case WLAN_CIPHER_SUITE_CCMP_256:
             if (gen_iv)
                 build.pn_offs = build.hdr_len;
             if (gen_iv || iv_spc)
                 build.hdr_len += IEEE80211_CCMP_HDR_LEN;
             break;
         case WLAN_CIPHER_SUITE_GCMP:
         case WLAN_CIPHER_SUITE_GCMP_256:
             if (gen_iv)
                 build.pn_offs = build.hdr_len;
             if (gen_iv || iv_spc)
                 build.hdr_len += IEEE80211_GCMP_HDR_LEN;
             break;
         case WLAN_CIPHER_SUITE_TKIP:
             /* cannot handle MMIC or IV generation in xmit-fast */
             if (mmic || gen_iv)
                 goto out;
             if (iv_spc)
                 build.hdr_len += IEEE80211_TKIP_IV_LEN;
             break;
         case WLAN_CIPHER_SUITE_WEP40:
         case WLAN_CIPHER_SUITE_WEP104:
             /* cannot handle IV generation in fast-xmit */
             if (gen_iv)
                 goto out;
             if (iv_spc)
                 build.hdr_len += IEEE80211_WEP_IV_LEN;
             break;
         case WLAN_CIPHER_SUITE_AES_CMAC:
         case WLAN_CIPHER_SUITE_BIP_CMAC_256:
         case WLAN_CIPHER_SUITE_BIP_GMAC_128:
         case WLAN_CIPHER_SUITE_BIP_GMAC_256:
             WARN(1,
                  "management cipher suite 0x%x enabled for data\n",
                  build.key->conf.cipher);
             goto out;
         default:
             /* we don't know how to generate IVs for this at all */
             if (WARN_ON(gen_iv))
                 goto out;
         }
 
         fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
     }
 
     hdr->frame_control = fc;
 
     memcpy(build.hdr + build.hdr_len,
            rfc1042_header,  sizeof(rfc1042_header));
     build.hdr_len += sizeof(rfc1042_header);
 
     fast_tx = kmemdup(&build, sizeof(build), GFP_ATOMIC);
     /* if the kmemdup fails, continue w/o fast_tx */
 
  out:
     /* we might have raced against another call to this function */
     old = rcu_dereference_protected(sta->fast_tx,
                     lockdep_is_held(&sta->lock));
     rcu_assign_pointer(sta->fast_tx, fast_tx);
     if (old)
         kfree_rcu(old, rcu_head);
     spin_unlock_bh(&sta->lock);
 }
 
 void ieee80211_check_fast_xmit_all(struct ieee80211_local *local)
 {
     struct sta_info *sta;
 
     rcu_read_lock();
     list_for_each_entry_rcu(sta, &local->sta_list, list)
         ieee80211_check_fast_xmit(sta);
     rcu_read_unlock();
 }
 
 void ieee80211_check_fast_xmit_iface(struct ieee80211_sub_if_data *sdata)
 {
     struct ieee80211_local *local = sdata->local;
     struct sta_info *sta;
 
     rcu_read_lock();
 
     list_for_each_entry_rcu(sta, &local->sta_list, list) {
         if (sdata != sta->sdata &&
             (!sta->sdata->bss || sta->sdata->bss != sdata->bss))
             continue;
         ieee80211_check_fast_xmit(sta);
     }
 
     rcu_read_unlock();
 }
 
 void ieee80211_clear_fast_xmit(struct sta_info *sta)
 {
     struct ieee80211_fast_tx *fast_tx;
 
     spin_lock_bh(&sta->lock);
     fast_tx = rcu_dereference_protected(sta->fast_tx,
                         lockdep_is_held(&sta->lock));
     RCU_INIT_POINTER(sta->fast_tx, NULL);
     spin_unlock_bh(&sta->lock);
 
     if (fast_tx)
         kfree_rcu(fast_tx, rcu_head);
 }
 
 static bool ieee80211_amsdu_realloc_pad(struct ieee80211_local *local,
                     struct sk_buff *skb, int headroom)
 {
     if (skb_headroom(skb) < headroom) {
         I802_DEBUG_INC(local->tx_expand_skb_head);
 
         if (pskb_expand_head(skb, headroom, 0, GFP_ATOMIC)) {
             wiphy_debug(local->hw.wiphy,
                     "failed to reallocate TX buffer\n");
             return false;
         }
     }
 
     return true;
 }
 
 static bool ieee80211_amsdu_prepare_head(struct ieee80211_sub_if_data *sdata,
                      struct ieee80211_fast_tx *fast_tx,
                      struct sk_buff *skb)
 {
     struct ieee80211_local *local = sdata->local;
     struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
     struct ieee80211_hdr *hdr;
     struct ethhdr *amsdu_hdr;
     int hdr_len = fast_tx->hdr_len - sizeof(rfc1042_header);
     int subframe_len = skb->len - hdr_len;
     void *data;
     u8 *qc, *h_80211_src, *h_80211_dst;
     const u8 *bssid;
 
     if (info->flags & IEEE80211_TX_CTL_RATE_CTRL_PROBE)
         return false;
 
     if (info->control.flags & IEEE80211_TX_CTRL_AMSDU)
         return true;
 
     if (!ieee80211_amsdu_realloc_pad(local, skb,
                      sizeof(*amsdu_hdr) +
                      local->hw.extra_tx_headroom))
         return false;
 
     data = skb_push(skb, sizeof(*amsdu_hdr));
     memmove(data, data + sizeof(*amsdu_hdr), hdr_len);
     hdr = data;
     amsdu_hdr = data + hdr_len;
     /* h_80211_src/dst is addr* field within hdr */
     h_80211_src = data + fast_tx->sa_offs;
     h_80211_dst = data + fast_tx->da_offs;
 
     amsdu_hdr->h_proto = cpu_to_be16(subframe_len);
     ether_addr_copy(amsdu_hdr->h_source, h_80211_src);
     ether_addr_copy(amsdu_hdr->h_dest, h_80211_dst);
 
     /* according to IEEE 802.11-2012 8.3.2 table 8-19, the outer SA/DA
      * fields needs to be changed to BSSID for A-MSDU frames depending
      * on FromDS/ToDS values.
      */
     switch (sdata->vif.type) {
     case NL80211_IFTYPE_STATION:
         bssid = sdata->vif.cfg.ap_addr;
         break;
     case NL80211_IFTYPE_AP:
     case NL80211_IFTYPE_AP_VLAN:
         bssid = sdata->vif.addr;
         break;
     default:
         bssid = NULL;
     }
 
     if (bssid && ieee80211_has_fromds(hdr->frame_control))
         ether_addr_copy(h_80211_src, bssid);
 
     if (bssid && ieee80211_has_tods(hdr->frame_control))
         ether_addr_copy(h_80211_dst, bssid);
 
     qc = ieee80211_get_qos_ctl(hdr);
     *qc |= IEEE80211_QOS_CTL_A_MSDU_PRESENT;
 
     info->control.flags |= IEEE80211_TX_CTRL_AMSDU;
 
     return true;
 }
 
 static bool ieee80211_amsdu_aggregate(struct ieee80211_sub_if_data *sdata,
                       struct sta_info *sta,
                       struct ieee80211_fast_tx *fast_tx,
                       struct sk_buff *skb)
 {
     struct ieee80211_local *local = sdata->local;
     struct fq *fq = &local->fq;
     struct fq_tin *tin;
     struct fq_flow *flow;
     u8 tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
     struct ieee80211_txq *txq = sta->sta.txq[tid];
     struct txq_info *txqi;
     struct sk_buff **frag_tail, *head;
     int subframe_len = skb->len - ETH_ALEN;
     u8 max_subframes = sta->sta.max_amsdu_subframes;
     int max_frags = local->hw.max_tx_fragments;
     int max_amsdu_len = sta->sta.max_amsdu_len;
     int orig_truesize;
     u32 flow_idx;
     __be16 len;
     void *data;
     bool ret = false;
     unsigned int orig_len;
     int n = 2, nfrags, pad = 0;
     u16 hdrlen;
 
     if (!ieee80211_hw_check(&local->hw, TX_AMSDU))
         return false;
 
     if (sdata->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED)
         return false;
 
     if (skb_is_gso(skb))
         return false;
 
     if (!txq)
         return false;
 
     txqi = to_txq_info(txq);
     if (test_bit(IEEE80211_TXQ_NO_AMSDU, &txqi->flags))
         return false;
 
     if (sta->sta.max_rc_amsdu_len)
         max_amsdu_len = min_t(int, max_amsdu_len,
                       sta->sta.max_rc_amsdu_len);
 
     if (sta->sta.max_tid_amsdu_len[tid])
         max_amsdu_len = min_t(int, max_amsdu_len,
                       sta->sta.max_tid_amsdu_len[tid]);
 
     flow_idx = fq_flow_idx(fq, skb);
 
     spin_lock_bh(&fq->lock);
 
     /* TODO: Ideally aggregation should be done on dequeue to remain
      * responsive to environment changes.
      */
 
     tin = &txqi->tin;
     flow = fq_flow_classify(fq, tin, flow_idx, skb);
     head = skb_peek_tail(&flow->queue);
     if (!head || skb_is_gso(head))
         goto out;
 
     orig_truesize = head->truesize;
     orig_len = head->len;
 
     if (skb->len + head->len > max_amsdu_len)
         goto out;
 
     nfrags = 1 + skb_shinfo(skb)->nr_frags;
     nfrags += 1 + skb_shinfo(head)->nr_frags;
     frag_tail = &skb_shinfo(head)->frag_list;
     while (*frag_tail) {
         nfrags += 1 + skb_shinfo(*frag_tail)->nr_frags;
         frag_tail = &(*frag_tail)->next;
         n++;
     }
 
     if (max_subframes && n > max_subframes)
         goto out;
 
     if (max_frags && nfrags > max_frags)
         goto out;
 
     if (!drv_can_aggregate_in_amsdu(local, head, skb))
         goto out;
 
     if (!ieee80211_amsdu_prepare_head(sdata, fast_tx, head))
         goto out;
 
     /* If n == 2, the "while (*frag_tail)" loop above didn't execute
      * and  frag_tail should be &skb_shinfo(head)->frag_list.
      * However, ieee80211_amsdu_prepare_head() can reallocate it.
      * Reload frag_tail to have it pointing to the correct place.
      */
     if (n == 2)
         frag_tail = &skb_shinfo(head)->frag_list;
 
     /*
      * Pad out the previous subframe to a multiple of 4 by adding the
      * padding to the next one, that's being added. Note that head->len
      * is the length of the full A-MSDU, but that works since each time
      * we add a new subframe we pad out the previous one to a multiple
      * of 4 and thus it no longer matters in the next round.
      */
     hdrlen = fast_tx->hdr_len - sizeof(rfc1042_header);
     if ((head->len - hdrlen) & 3)
         pad = 4 - ((head->len - hdrlen) & 3);
 
     if (!ieee80211_amsdu_realloc_pad(local, skb, sizeof(rfc1042_header) +
                              2 + pad))
         goto out_recalc;
 
     ret = true;
     data = skb_push(skb, ETH_ALEN + 2);
     memmove(data, data + ETH_ALEN + 2, 2 * ETH_ALEN);
 
     data += 2 * ETH_ALEN;
     len = cpu_to_be16(subframe_len);
     memcpy(data, &len, 2);
     memcpy(data + 2, rfc1042_header, sizeof(rfc1042_header));
 
     memset(skb_push(skb, pad), 0, pad);
 
     head->len += skb->len;
     head->data_len += skb->len;
     *frag_tail = skb;
 
 out_recalc:
     fq->memory_usage += head->truesize - orig_truesize;
     if (head->len != orig_len) {
         flow->backlog += head->len - orig_len;
         tin->backlog_bytes += head->len - orig_len;
     }
 out:
     spin_unlock_bh(&fq->lock);
 
     return ret;
 }
 
 /*
  * Can be called while the sta lock is held. Anything that can cause packets to
  * be generated will cause deadlock!
  */
 static ieee80211_tx_result
 ieee80211_xmit_fast_finish(struct ieee80211_sub_if_data *sdata,
                struct sta_info *sta, u8 pn_offs,
                struct ieee80211_key *key,
                struct ieee80211_tx_data *tx)
 {
     struct sk_buff *skb = tx->skb;
     struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
     struct ieee80211_hdr *hdr = (void *)skb->data;
     u8 tid = IEEE80211_NUM_TIDS;
 
     if (!ieee80211_hw_check(&tx->local->hw, HAS_RATE_CONTROL) &&
         ieee80211_tx_h_rate_ctrl(tx) != TX_CONTINUE)
         return TX_DROP;
 
     if (key)
         info->control.hw_key = &key->conf;
 
     dev_sw_netstats_tx_add(skb->dev, 1, skb->len);
 
     if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
         tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
         hdr->seq_ctrl = ieee80211_tx_next_seq(sta, tid);
     } else {
         info->flags |= IEEE80211_TX_CTL_ASSIGN_SEQ;
         hdr->seq_ctrl = cpu_to_le16(sdata->sequence_number);
         sdata->sequence_number += 0x10;
     }
 
     if (skb_shinfo(skb)->gso_size)
         sta->deflink.tx_stats.msdu[tid] +=
             DIV_ROUND_UP(skb->len, skb_shinfo(skb)->gso_size);
     else
         sta->deflink.tx_stats.msdu[tid]++;
 
     info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
 
     /* statistics normally done by ieee80211_tx_h_stats (but that
      * has to consider fragmentation, so is more complex)
      */
     sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
     sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++;
 
     if (pn_offs) {
         u64 pn;
         u8 *crypto_hdr = skb->data + pn_offs;
 
         switch (key->conf.cipher) {
         case WLAN_CIPHER_SUITE_CCMP:
         case WLAN_CIPHER_SUITE_CCMP_256:
         case WLAN_CIPHER_SUITE_GCMP:
         case WLAN_CIPHER_SUITE_GCMP_256:
             pn = atomic64_inc_return(&key->conf.tx_pn);
             crypto_hdr[0] = pn;
             crypto_hdr[1] = pn >> 8;
             crypto_hdr[3] = 0x20 | (key->conf.keyidx << 6);
             crypto_hdr[4] = pn >> 16;
             crypto_hdr[5] = pn >> 24;
             crypto_hdr[6] = pn >> 32;
             crypto_hdr[7] = pn >> 40;
             break;
         }
     }
 
     return TX_CONTINUE;
 }
 
 static bool ieee80211_xmit_fast(struct ieee80211_sub_if_data *sdata,
                 struct sta_info *sta,
                 struct ieee80211_fast_tx *fast_tx,
                 struct sk_buff *skb)
 {
     struct ieee80211_local *local = sdata->local;
     u16 ethertype = (skb->data[12] << 8) | skb->data[13];
     int extra_head = fast_tx->hdr_len - (ETH_HLEN - 2);
     int hw_headroom = sdata->local->hw.extra_tx_headroom;
     struct ethhdr eth;
     struct ieee80211_tx_info *info;
     struct ieee80211_hdr *hdr = (void *)fast_tx->hdr;
     struct ieee80211_tx_data tx;
     ieee80211_tx_result r;
     struct tid_ampdu_tx *tid_tx = NULL;
     u8 tid = IEEE80211_NUM_TIDS;
 
     /* control port protocol needs a lot of special handling */
     if (cpu_to_be16(ethertype) == sdata->control_port_protocol)
         return false;
 
     /* only RFC 1042 SNAP */
     if (ethertype < ETH_P_802_3_MIN)
         return false;
 
     /* don't handle TX status request here either */
     if (skb->sk && skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS)
         return false;
 
     if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
         tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
         tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
         if (tid_tx) {
             if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state))
                 return false;
             if (tid_tx->timeout)
                 tid_tx->last_tx = jiffies;
         }
     }
 
     /* after this point (skb is modified) we cannot return false */
 
     skb = skb_share_check(skb, GFP_ATOMIC);
     if (unlikely(!skb))
         return true;
 
     if ((hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) &&
         ieee80211_amsdu_aggregate(sdata, sta, fast_tx, skb))
         return true;
 
     /* will not be crypto-handled beyond what we do here, so use false
      * as the may-encrypt argument for the resize to not account for
      * more room than we already have in 'extra_head'
      */
     if (unlikely(ieee80211_skb_resize(sdata, skb,
                       max_t(int, extra_head + hw_headroom -
                              skb_headroom(skb), 0),
                       ENCRYPT_NO))) {
         kfree_skb(skb);
         return true;
     }
 
     memcpy(&eth, skb->data, ETH_HLEN - 2);
     hdr = skb_push(skb, extra_head);
     memcpy(skb->data, fast_tx->hdr, fast_tx->hdr_len);
     memcpy(skb->data + fast_tx->da_offs, eth.h_dest, ETH_ALEN);
     memcpy(skb->data + fast_tx->sa_offs, eth.h_source, ETH_ALEN);
 
     info = IEEE80211_SKB_CB(skb);
     memset(info, 0, sizeof(*info));
     info->band = fast_tx->band;
     info->control.vif = &sdata->vif;
     info->flags = IEEE80211_TX_CTL_FIRST_FRAGMENT |
               IEEE80211_TX_CTL_DONTFRAG |
               (tid_tx ? IEEE80211_TX_CTL_AMPDU : 0);
     info->control.flags = IEEE80211_TX_CTRL_FAST_XMIT |
                   u32_encode_bits(IEEE80211_LINK_UNSPECIFIED,
                           IEEE80211_TX_CTRL_MLO_LINK);
 
 #ifdef CONFIG_MAC80211_DEBUGFS
     if (local->force_tx_status)
         info->flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 #endif
 
     if (hdr->frame_control & cpu_to_le16(IEEE80211_STYPE_QOS_DATA)) {
         tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
         *ieee80211_get_qos_ctl(hdr) = tid;
     }
 
     __skb_queue_head_init(&tx.skbs);
 
     tx.flags = IEEE80211_TX_UNICAST;
     tx.local = local;
     tx.sdata = sdata;
     tx.sta = sta;
     tx.key = fast_tx->key;
 
     if (ieee80211_queue_skb(local, sdata, sta, skb))
         return true;
 
     tx.skb = skb;
     r = ieee80211_xmit_fast_finish(sdata, sta, fast_tx->pn_offs,
                        fast_tx->key, &tx);
     tx.skb = NULL;
     if (r == TX_DROP) {
         kfree_skb(skb);
         return true;
     }
 
     if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
         sdata = container_of(sdata->bss,
                      struct ieee80211_sub_if_data, u.ap);
 
     __skb_queue_tail(&tx.skbs, skb);
     ieee80211_tx_frags(local, &sdata->vif, sta, &tx.skbs, false);
     return true;
 }
 
 struct sk_buff *ieee80211_tx_dequeue(struct ieee80211_hw *hw,
                      struct ieee80211_txq *txq)
 {
     struct ieee80211_local *local = hw_to_local(hw);
     struct txq_info *txqi = container_of(txq, struct txq_info, txq);
     struct ieee80211_hdr *hdr;
     struct sk_buff *skb = NULL;
     struct fq *fq = &local->fq;
     struct fq_tin *tin = &txqi->tin;
     struct ieee80211_tx_info *info;
     struct ieee80211_tx_data tx;
     ieee80211_tx_result r;
     struct ieee80211_vif *vif = txq->vif;
 
     WARN_ON_ONCE(softirq_count() == 0);
 
     if (!ieee80211_txq_airtime_check(hw, txq))
         return NULL;
 
 begin:
     spin_lock_bh(&fq->lock);
 
     if (test_bit(IEEE80211_TXQ_STOP, &txqi->flags) ||
         test_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags))
         goto out;
 
     if (vif->txqs_stopped[txq->ac]) {
         set_bit(IEEE80211_TXQ_STOP_NETIF_TX, &txqi->flags);
         goto out;
     }
 
     /* Make sure fragments stay together. */
     skb = __skb_dequeue(&txqi->frags);
     if (unlikely(skb)) {
         if (!(IEEE80211_SKB_CB(skb)->control.flags &
                 IEEE80211_TX_INTCFL_NEED_TXPROCESSING))
             goto out;
         IEEE80211_SKB_CB(skb)->control.flags &=
             ~IEEE80211_TX_INTCFL_NEED_TXPROCESSING;
     } else {
         skb = fq_tin_dequeue(fq, tin, fq_tin_dequeue_func);
     }
 
     if (!skb)
         goto out;
 
     spin_unlock_bh(&fq->lock);
 
     hdr = (struct ieee80211_hdr *)skb->data;
     info = IEEE80211_SKB_CB(skb);
 
     memset(&tx, 0, sizeof(tx));
     __skb_queue_head_init(&tx.skbs);
     tx.local = local;
     tx.skb = skb;
     tx.sdata = vif_to_sdata(info->control.vif);
 
     if (txq->sta) {
         tx.sta = container_of(txq->sta, struct sta_info, sta);
         /*
          * Drop unicast frames to unauthorised stations unless they are
          * injected frames or EAPOL frames from the local station.
          */
         if (unlikely(!(info->flags & IEEE80211_TX_CTL_INJECTED) &&
                  ieee80211_is_data(hdr->frame_control) &&
                  !ieee80211_vif_is_mesh(&tx.sdata->vif) &&
                  tx.sdata->vif.type != NL80211_IFTYPE_OCB &&
                  !is_multicast_ether_addr(hdr->addr1) &&
                  !test_sta_flag(tx.sta, WLAN_STA_AUTHORIZED) &&
                  (!(info->control.flags &
                 IEEE80211_TX_CTRL_PORT_CTRL_PROTO) ||
                   !ether_addr_equal(tx.sdata->vif.addr,
                         hdr->addr2)))) {
             I802_DEBUG_INC(local->tx_handlers_drop_unauth_port);
             ieee80211_free_txskb(&local->hw, skb);
             goto begin;
         }
     }
 
     /*
      * The key can be removed while the packet was queued, so need to call
      * this here to get the current key.
      */
     r = ieee80211_tx_h_select_key(&tx);
     if (r != TX_CONTINUE) {
         ieee80211_free_txskb(&local->hw, skb);
         goto begin;
     }
 
     if (test_bit(IEEE80211_TXQ_AMPDU, &txqi->flags))
         info->flags |= IEEE80211_TX_CTL_AMPDU;
     else
         info->flags &= ~IEEE80211_TX_CTL_AMPDU;
 
     if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) {
         if (!ieee80211_hw_check(&local->hw, HAS_RATE_CONTROL)) {
             r = ieee80211_tx_h_rate_ctrl(&tx);
             if (r != TX_CONTINUE) {
                 ieee80211_free_txskb(&local->hw, skb);
                 goto begin;
             }
         }
         goto encap_out;
     }
 
     if (info->control.flags & IEEE80211_TX_CTRL_FAST_XMIT) {
         struct sta_info *sta = container_of(txq->sta, struct sta_info,
                             sta);
         u8 pn_offs = 0;
 
         if (tx.key &&
             (tx.key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV))
             pn_offs = ieee80211_hdrlen(hdr->frame_control);
 
         r = ieee80211_xmit_fast_finish(sta->sdata, sta, pn_offs,
                            tx.key, &tx);
         if (r != TX_CONTINUE) {
             ieee80211_free_txskb(&local->hw, skb);
             goto begin;
         }
     } else {
         if (invoke_tx_handlers_late(&tx))
             goto begin;
 
         skb = __skb_dequeue(&tx.skbs);
 
         if (!skb_queue_empty(&tx.skbs)) {
             spin_lock_bh(&fq->lock);
             skb_queue_splice_tail(&tx.skbs, &txqi->frags);
             spin_unlock_bh(&fq->lock);
         }
     }
 
     if (skb_has_frag_list(skb) &&
         !ieee80211_hw_check(&local->hw, TX_FRAG_LIST)) {
         if (skb_linearize(skb)) {
             ieee80211_free_txskb(&local->hw, skb);
             goto begin;
         }
     }
 
     switch (tx.sdata->vif.type) {
     case NL80211_IFTYPE_MONITOR:
         if (tx.sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
             vif = &tx.sdata->vif;
             break;
         }
         tx.sdata = rcu_dereference(local->monitor_sdata);
         if (tx.sdata) {
             vif = &tx.sdata->vif;
             info->hw_queue =
                 vif->hw_queue[skb_get_queue_mapping(skb)];
         } else if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL)) {
             ieee80211_free_txskb(&local->hw, skb);
             goto begin;
         } else {
             vif = NULL;
         }
         break;
     case NL80211_IFTYPE_AP_VLAN:
         tx.sdata = container_of(tx.sdata->bss,
                     struct ieee80211_sub_if_data, u.ap);
         fallthrough;
     default:
         vif = &tx.sdata->vif;
         break;
     }
 
 encap_out:
     IEEE80211_SKB_CB(skb)->control.vif = vif;
 
     if (tx.sta &&
         wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL)) {
         bool ampdu = txq->ac != IEEE80211_AC_VO;
         u32 airtime;
 
         airtime = ieee80211_calc_expected_tx_airtime(hw, vif, txq->sta,
                                  skb->len, ampdu);
         if (airtime) {
             airtime = ieee80211_info_set_tx_time_est(info, airtime);
             ieee80211_sta_update_pending_airtime(local, tx.sta,
                                  txq->ac,
                                  airtime,
                                  false);
         }
     }
 
     return skb;
 
 out:
     spin_unlock_bh(&fq->lock);
 
     return skb;
 }
 EXPORT_SYMBOL(ieee80211_tx_dequeue);
 
 static inline s32 ieee80211_sta_deficit(struct sta_info *sta, u8 ac)
 {
     struct airtime_info *air_info = &sta->airtime[ac];
 
     return air_info->deficit - atomic_read(&air_info->aql_tx_pending);
 }
 
 static void
 ieee80211_txq_set_active(struct txq_info *txqi)
 {
     struct sta_info *sta;
 
     if (!txqi->txq.sta)
         return;
 
     sta = container_of(txqi->txq.sta, struct sta_info, sta);
     sta->airtime[txqi->txq.ac].last_active = (u32)jiffies;
 }
 
 static bool
 ieee80211_txq_keep_active(struct txq_info *txqi)
 {
     struct sta_info *sta;
     u32 diff;
 
     if (!txqi->txq.sta)
         return false;
 
     sta = container_of(txqi->txq.sta, struct sta_info, sta);
     if (ieee80211_sta_deficit(sta, txqi->txq.ac) >= 0)
         return false;
 
     diff = (u32)jiffies - sta->airtime[txqi->txq.ac].last_active;
 
     return diff <= AIRTIME_ACTIVE_DURATION;
 }
 
 struct ieee80211_txq *ieee80211_next_txq(struct ieee80211_hw *hw, u8 ac)
 {
     struct ieee80211_local *local = hw_to_local(hw);
     struct ieee80211_txq *ret = NULL;
     struct txq_info *txqi = NULL, *head = NULL;
     bool found_eligible_txq = false;
 
     spin_lock_bh(&local->active_txq_lock[ac]);
 
     if (!local->schedule_round[ac])
         goto out;
 
  begin:
     txqi = list_first_entry_or_null(&local->active_txqs[ac],
                     struct txq_info,
                     schedule_order);
     if (!txqi)
         goto out;
 
     if (txqi == head) {
         if (!found_eligible_txq)
             goto out;
         else
             found_eligible_txq = false;
     }
 
     if (!head)
         head = txqi;
 
     if (txqi->txq.sta) {
         struct sta_info *sta = container_of(txqi->txq.sta,
                             struct sta_info, sta);
         bool aql_check = ieee80211_txq_airtime_check(hw, &txqi->txq);
         s32 deficit = ieee80211_sta_deficit(sta, txqi->txq.ac);
 
         if (aql_check)
             found_eligible_txq = true;
 
         if (deficit < 0)
             sta->airtime[txqi->txq.ac].deficit +=
                 sta->airtime_weight;
 
         if (deficit < 0 || !aql_check) {
             list_move_tail(&txqi->schedule_order,
                        &local->active_txqs[txqi->txq.ac]);
             goto begin;
         }
     }
 
     if (txqi->schedule_round == local->schedule_round[ac])
         goto out;
 
     list_del_init(&txqi->schedule_order);
     txqi->schedule_round = local->schedule_round[ac];
     ret = &txqi->txq;
 
 out:
     spin_unlock_bh(&local->active_txq_lock[ac]);
     return ret;
 }
 EXPORT_SYMBOL(ieee80211_next_txq);
 
 void __ieee80211_schedule_txq(struct ieee80211_hw *hw,
                   struct ieee80211_txq *txq,
                   bool force)
 {
     struct ieee80211_local *local = hw_to_local(hw);
     struct txq_info *txqi = to_txq_info(txq);
     bool has_queue;
 
     spin_lock_bh(&local->active_txq_lock[txq->ac]);
 
     has_queue = force || txq_has_queue(txq);
     if (list_empty(&txqi->schedule_order) &&
         (has_queue || ieee80211_txq_keep_active(txqi))) {
         /* If airtime accounting is active, always enqueue STAs at the
          * head of the list to ensure that they only get moved to the
          * back by the airtime DRR scheduler once they have a negative
          * deficit. A station that already has a negative deficit will
          * get immediately moved to the back of the list on the next
          * call to ieee80211_next_txq().
          */
         if (txqi->txq.sta && local->airtime_flags && has_queue &&
             wiphy_ext_feature_isset(local->hw.wiphy,
                         NL80211_EXT_FEATURE_AIRTIME_FAIRNESS))
             list_add(&txqi->schedule_order,
                  &local->active_txqs[txq->ac]);
         else
             list_add_tail(&txqi->schedule_order,
                       &local->active_txqs[txq->ac]);
         if (has_queue)
             ieee80211_txq_set_active(txqi);
     }
 
     spin_unlock_bh(&local->active_txq_lock[txq->ac]);
 }
 EXPORT_SYMBOL(__ieee80211_schedule_txq);
 
 DEFINE_STATIC_KEY_FALSE(aql_disable);
 
 bool ieee80211_txq_airtime_check(struct ieee80211_hw *hw,
                  struct ieee80211_txq *txq)
 {
     struct sta_info *sta;
     struct ieee80211_local *local = hw_to_local(hw);
 
     if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL))
         return true;
 
     if (static_branch_unlikely(&aql_disable))
         return true;
 
     if (!txq->sta)
         return true;
 
     if (unlikely(txq->tid == IEEE80211_NUM_TIDS))
         return true;
 
     sta = container_of(txq->sta, struct sta_info, sta);
     if (atomic_read(&sta->airtime[txq->ac].aql_tx_pending) <
         sta->airtime[txq->ac].aql_limit_low)
         return true;
 
     if (atomic_read(&local->aql_total_pending_airtime) <
         local->aql_threshold &&
         atomic_read(&sta->airtime[txq->ac].aql_tx_pending) <
         sta->airtime[txq->ac].aql_limit_high)
         return true;
 
     return false;
 }
 EXPORT_SYMBOL(ieee80211_txq_airtime_check);
 
 static bool
 ieee80211_txq_schedule_airtime_check(struct ieee80211_local *local, u8 ac)
 {
     unsigned int num_txq = 0;
     struct txq_info *txq;
     u32 aql_limit;
 
     if (!wiphy_ext_feature_isset(local->hw.wiphy, NL80211_EXT_FEATURE_AQL))
         return true;
 
     list_for_each_entry(txq, &local->active_txqs[ac], schedule_order)
         num_txq++;
 
     aql_limit = (num_txq - 1) * local->aql_txq_limit_low[ac] / 2 +
             local->aql_txq_limit_high[ac];
 
     return atomic_read(&local->aql_ac_pending_airtime[ac]) < aql_limit;
 }
 
 bool ieee80211_txq_may_transmit(struct ieee80211_hw *hw,
                 struct ieee80211_txq *txq)
 {
     struct ieee80211_local *local = hw_to_local(hw);
     struct txq_info *iter, *tmp, *txqi = to_txq_info(txq);
     struct sta_info *sta;
     u8 ac = txq->ac;
 
     spin_lock_bh(&local->active_txq_lock[ac]);
 
     if (!txqi->txq.sta)
         goto out;
 
     if (list_empty(&txqi->schedule_order))
         goto out;
 
     if (!ieee80211_txq_schedule_airtime_check(local, ac))
         goto out;
 
     list_for_each_entry_safe(iter, tmp, &local->active_txqs[ac],
                  schedule_order) {
         if (iter == txqi)
             break;
 
         if (!iter->txq.sta) {
             list_move_tail(&iter->schedule_order,
                        &local->active_txqs[ac]);
             continue;
         }
         sta = container_of(iter->txq.sta, struct sta_info, sta);
         if (ieee80211_sta_deficit(sta, ac) < 0)
             sta->airtime[ac].deficit += sta->airtime_weight;
         list_move_tail(&iter->schedule_order, &local->active_txqs[ac]);
     }
 
     sta = container_of(txqi->txq.sta, struct sta_info, sta);
     if (sta->airtime[ac].deficit >= 0)
         goto out;
 
     sta->airtime[ac].deficit += sta->airtime_weight;
     list_move_tail(&txqi->schedule_order, &local->active_txqs[ac]);
     spin_unlock_bh(&local->active_txq_lock[ac]);
 
     return false;
 out:
     if (!list_empty(&txqi->schedule_order))
         list_del_init(&txqi->schedule_order);
     spin_unlock_bh(&local->active_txq_lock[ac]);
 
     return true;
 }
 EXPORT_SYMBOL(ieee80211_txq_may_transmit);
 
 void ieee80211_txq_schedule_start(struct ieee80211_hw *hw, u8 ac)
 {
     struct ieee80211_local *local = hw_to_local(hw);
 
     spin_lock_bh(&local->active_txq_lock[ac]);
 
     if (ieee80211_txq_schedule_airtime_check(local, ac)) {
         local->schedule_round[ac]++;
         if (!local->schedule_round[ac])
             local->schedule_round[ac]++;
     } else {
         local->schedule_round[ac] = 0;
     }
 
     spin_unlock_bh(&local->active_txq_lock[ac]);
 }
 EXPORT_SYMBOL(ieee80211_txq_schedule_start);
 
 void __ieee80211_subif_start_xmit(struct sk_buff *skb,
                   struct net_device *dev,
                   u32 info_flags,
                   u32 ctrl_flags,
                   u64 *cookie)
 {
     struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
     struct ieee80211_local *local = sdata->local;
     struct sta_info *sta;
     struct sk_buff *next;
     int len = skb->len;
 
     if (unlikely(skb->len < ETH_HLEN)) {
         kfree_skb(skb);
         return;
     }
 
     rcu_read_lock();
 
     if (ieee80211_lookup_ra_sta(sdata, skb, &sta))
         goto out_free;
 
     if (IS_ERR(sta))
         sta = NULL;
 
     if (local->ops->wake_tx_queue) {
         u16 queue = __ieee80211_select_queue(sdata, sta, skb);
         skb_set_queue_mapping(skb, queue);
         skb_get_hash(skb);
     }
 
     ieee80211_aggr_check(sdata, sta, skb);
 
     sk_pacing_shift_update(skb->sk, sdata->local->hw.tx_sk_pacing_shift);
 
     if (sta) {
         struct ieee80211_fast_tx *fast_tx;
 
         fast_tx = rcu_dereference(sta->fast_tx);
 
         if (fast_tx &&
             ieee80211_xmit_fast(sdata, sta, fast_tx, skb))
             goto out;
     }
 
     if (skb_is_gso(skb)) {
         struct sk_buff *segs;
 
         segs = skb_gso_segment(skb, 0);
         if (IS_ERR(segs)) {
             goto out_free;
         } else if (segs) {
             consume_skb(skb);
             skb = segs;
         }
     } else {
         /* we cannot process non-linear frames on this path */
         if (skb_linearize(skb))
             goto out_free;
 
         /* the frame could be fragmented, software-encrypted, and other
          * things so we cannot really handle checksum offload with it -
          * fix it up in software before we handle anything else.
          */
         if (skb->ip_summed == CHECKSUM_PARTIAL) {
             skb_set_transport_header(skb,
                          skb_checksum_start_offset(skb));
             if (skb_checksum_help(skb))
                 goto out_free;
         }
     }
 
     skb_list_walk_safe(skb, skb, next) {
         skb_mark_not_on_list(skb);
 
         if (skb->protocol == sdata->control_port_protocol)
             ctrl_flags |= IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP;
 
         skb = ieee80211_build_hdr(sdata, skb, info_flags,
                       sta, ctrl_flags, cookie);
         if (IS_ERR(skb)) {
             kfree_skb_list(next);
             goto out;
         }
 
         dev_sw_netstats_tx_add(dev, 1, skb->len);
 
         ieee80211_xmit(sdata, sta, skb);
     }
     goto out;
  out_free:
     kfree_skb(skb);
     len = 0;
  out:
     if (len)
         ieee80211_tpt_led_trig_tx(local, len);
     rcu_read_unlock();
 }
 
 static int ieee80211_change_da(struct sk_buff *skb, struct sta_info *sta)
 {
     struct ethhdr *eth;
     int err;
 
     err = skb_ensure_writable(skb, ETH_HLEN);
     if (unlikely(err))
         return err;
 
     eth = (void *)skb->data;
     ether_addr_copy(eth->h_dest, sta->sta.addr);
 
     return 0;
 }
 
 static bool ieee80211_multicast_to_unicast(struct sk_buff *skb,
                        struct net_device *dev)
 {
     struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
     const struct ethhdr *eth = (void *)skb->data;
     const struct vlan_ethhdr *ethvlan = (void *)skb->data;
     __be16 ethertype;
 
     switch (sdata->vif.type) {
     case NL80211_IFTYPE_AP_VLAN:
         if (sdata->u.vlan.sta)
             return false;
         if (sdata->wdev.use_4addr)
             return false;
         fallthrough;
     case NL80211_IFTYPE_AP:
         /* check runtime toggle for this bss */
         if (!sdata->bss->multicast_to_unicast)
             return false;
         break;
     default:
         return false;
     }
 
     /* multicast to unicast conversion only for some payload */
     ethertype = eth->h_proto;
     if (ethertype == htons(ETH_P_8021Q) && skb->len >= VLAN_ETH_HLEN)
         ethertype = ethvlan->h_vlan_encapsulated_proto;
     switch (ethertype) {
     case htons(ETH_P_ARP):
     case htons(ETH_P_IP):
     case htons(ETH_P_IPV6):
         break;
     default:
         return false;
     }
 
     return true;
 }
 
 static void
 ieee80211_convert_to_unicast(struct sk_buff *skb, struct net_device *dev,
                  struct sk_buff_head *queue)
 {
     struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
     struct ieee80211_local *local = sdata->local;
     const struct ethhdr *eth = (struct ethhdr *)skb->data;
     struct sta_info *sta, *first = NULL;
     struct sk_buff *cloned_skb;
 
     rcu_read_lock();
 
     list_for_each_entry_rcu(sta, &local->sta_list, list) {
         if (sdata != sta->sdata)
             /* AP-VLAN mismatch */
             continue;
         if (unlikely(ether_addr_equal(eth->h_source, sta->sta.addr)))
             /* do not send back to source */
             continue;
         if (!first) {
             first = sta;
             continue;
         }
         cloned_skb = skb_clone(skb, GFP_ATOMIC);
         if (!cloned_skb)
             goto multicast;
         if (unlikely(ieee80211_change_da(cloned_skb, sta))) {
             dev_kfree_skb(cloned_skb);
             goto multicast;
         }
         __skb_queue_tail(queue, cloned_skb);
     }
 
     if (likely(first)) {
         if (unlikely(ieee80211_change_da(skb, first)))
             goto multicast;
         __skb_queue_tail(queue, skb);
     } else {
         /* no STA connected, drop */
         kfree_skb(skb);
         skb = NULL;
     }
 
     goto out;
 multicast:
     __skb_queue_purge(queue);
     __skb_queue_tail(queue, skb);
 out:
     rcu_read_unlock();
 }
 
 static void ieee80211_mlo_multicast_tx_one(struct ieee80211_sub_if_data *sdata,
                        struct sk_buff *skb, u32 ctrl_flags,
                        unsigned int link_id)
 {
     struct sk_buff *out;
 
     out = skb_copy(skb, GFP_ATOMIC);
     if (!out)
         return;
 
     ctrl_flags |= u32_encode_bits(link_id, IEEE80211_TX_CTRL_MLO_LINK);
     __ieee80211_subif_start_xmit(out, sdata->dev, 0, ctrl_flags, NULL);
 }
 
 static void ieee80211_mlo_multicast_tx(struct net_device *dev,
                        struct sk_buff *skb)
 {
     struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
     unsigned long links = sdata->vif.valid_links;
     unsigned int link;
     u32 ctrl_flags = IEEE80211_TX_CTRL_MCAST_MLO_FIRST_TX;
 
     if (hweight16(links) == 1) {
         ctrl_flags |= u32_encode_bits(ffs(links) - 1,
                           IEEE80211_TX_CTRL_MLO_LINK);
 
         __ieee80211_subif_start_xmit(skb, sdata->dev, 0, ctrl_flags,
                          NULL);
         return;
     }
 
     for_each_set_bit(link, &links, IEEE80211_MLD_MAX_NUM_LINKS) {
         ieee80211_mlo_multicast_tx_one(sdata, skb, ctrl_flags, link);
         ctrl_flags = 0;
     }
     kfree_skb(skb);
 }
 
 /**
  * ieee80211_subif_start_xmit - netif start_xmit function for 802.3 vifs
  * @skb: packet to be sent
  * @dev: incoming interface
  *
  * On failure skb will be freed.
  */
 netdev_tx_t ieee80211_subif_start_xmit(struct sk_buff *skb,
                        struct net_device *dev)
 {
     struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
     const struct ethhdr *eth = (void *)skb->data;
 
     if (likely(!is_multicast_ether_addr(eth->h_dest)))
         goto normal;
 
     if (unlikely(ieee80211_multicast_to_unicast(skb, dev))) {
         struct sk_buff_head queue;
 
         __skb_queue_head_init(&queue);
         ieee80211_convert_to_unicast(skb, dev, &queue);
         while ((skb = __skb_dequeue(&queue)))
             __ieee80211_subif_start_xmit(skb, dev, 0,
                              IEEE80211_TX_CTRL_MLO_LINK_UNSPEC,
                              NULL);
     } else if (sdata->vif.valid_links &&
            sdata->vif.type == NL80211_IFTYPE_AP &&
            !ieee80211_hw_check(&sdata->local->hw, MLO_MCAST_MULTI_LINK_TX)) {
         ieee80211_mlo_multicast_tx(dev, skb);
     } else {
 normal:
         __ieee80211_subif_start_xmit(skb, dev, 0,
                          IEEE80211_TX_CTRL_MLO_LINK_UNSPEC,
                          NULL);
     }
 
     return NETDEV_TX_OK;
 }
 
 static bool ieee80211_tx_8023(struct ieee80211_sub_if_data *sdata,
                   struct sk_buff *skb, struct sta_info *sta,
                   bool txpending)
 {
     struct ieee80211_local *local = sdata->local;
     struct ieee80211_tx_control control = {};
     struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
     struct ieee80211_sta *pubsta = NULL;
     unsigned long flags;
     int q = info->hw_queue;
 
     if (sta)
         sk_pacing_shift_update(skb->sk, local->hw.tx_sk_pacing_shift);
 
     ieee80211_tpt_led_trig_tx(local, skb->len);
 
     if (ieee80211_queue_skb(local, sdata, sta, skb))
         return true;
 
     spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 
     if (local->queue_stop_reasons[q] ||
         (!txpending && !skb_queue_empty(&local->pending[q]))) {
         if (txpending)
             skb_queue_head(&local->pending[q], skb);
         else
             skb_queue_tail(&local->pending[q], skb);
 
         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 
         return false;
     }
 
     spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 
     if (sta && sta->uploaded)
         pubsta = &sta->sta;
 
     control.sta = pubsta;
 
     drv_tx(local, &control, skb);
 
     return true;
 }
 
 static void ieee80211_8023_xmit(struct ieee80211_sub_if_data *sdata,
                 struct net_device *dev, struct sta_info *sta,
                 struct ieee80211_key *key, struct sk_buff *skb)
 {
     struct ieee80211_tx_info *info;
     struct ieee80211_local *local = sdata->local;
     struct tid_ampdu_tx *tid_tx;
     u8 tid;
 
     if (local->ops->wake_tx_queue) {
         u16 queue = __ieee80211_select_queue(sdata, sta, skb);
         skb_set_queue_mapping(skb, queue);
         skb_get_hash(skb);
     }
 
     if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)) &&
         test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state))
         goto out_free;
 
     skb = skb_share_check(skb, GFP_ATOMIC);
     if (unlikely(!skb))
         return;
 
     info = IEEE80211_SKB_CB(skb);
     memset(info, 0, sizeof(*info));
 
     ieee80211_aggr_check(sdata, sta, skb);
 
     tid = skb->priority & IEEE80211_QOS_CTL_TAG1D_MASK;
     tid_tx = rcu_dereference(sta->ampdu_mlme.tid_tx[tid]);
     if (tid_tx) {
         if (!test_bit(HT_AGG_STATE_OPERATIONAL, &tid_tx->state)) {
             /* fall back to non-offload slow path */
             __ieee80211_subif_start_xmit(skb, dev, 0,
                              IEEE80211_TX_CTRL_MLO_LINK_UNSPEC,
                              NULL);
             return;
         }
 
         info->flags |= IEEE80211_TX_CTL_AMPDU;
         if (tid_tx->timeout)
             tid_tx->last_tx = jiffies;
     }
 
     if (unlikely(skb->sk &&
              skb_shinfo(skb)->tx_flags & SKBTX_WIFI_STATUS))
         info->ack_frame_id = ieee80211_store_ack_skb(local, skb,
                                  &info->flags, NULL);
 
     info->hw_queue = sdata->vif.hw_queue[skb_get_queue_mapping(skb)];
 
     dev_sw_netstats_tx_add(dev, 1, skb->len);
 
     sta->deflink.tx_stats.bytes[skb_get_queue_mapping(skb)] += skb->len;
     sta->deflink.tx_stats.packets[skb_get_queue_mapping(skb)]++;
 
     if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
         sdata = container_of(sdata->bss,
                      struct ieee80211_sub_if_data, u.ap);
 
     info->flags |= IEEE80211_TX_CTL_HW_80211_ENCAP;
     info->control.vif = &sdata->vif;
 
     if (key)
         info->control.hw_key = &key->conf;
 
     ieee80211_tx_8023(sdata, skb, sta, false);
 
     return;
 
 out_free:
     kfree_skb(skb);
 }
 
 netdev_tx_t ieee80211_subif_start_xmit_8023(struct sk_buff *skb,
                         struct net_device *dev)
 {
     struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
     struct ethhdr *ehdr = (struct ethhdr *)skb->data;
     struct ieee80211_key *key;
     struct sta_info *sta;
 
     if (unlikely(skb->len < ETH_HLEN)) {
         kfree_skb(skb);
         return NETDEV_TX_OK;
     }
 
     rcu_read_lock();
 
     if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
         kfree_skb(skb);
         goto out;
     }
 
     if (unlikely(IS_ERR_OR_NULL(sta) || !sta->uploaded ||
         !test_sta_flag(sta, WLAN_STA_AUTHORIZED) ||
         sdata->control_port_protocol == ehdr->h_proto))
         goto skip_offload;
 
     key = rcu_dereference(sta->ptk[sta->ptk_idx]);
     if (!key)
         key = rcu_dereference(sdata->default_unicast_key);
 
     if (key && (!(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) ||
             key->conf.cipher == WLAN_CIPHER_SUITE_TKIP))
         goto skip_offload;
 
     ieee80211_8023_xmit(sdata, dev, sta, key, skb);
     goto out;
 
 skip_offload:
     ieee80211_subif_start_xmit(skb, dev);
 out:
     rcu_read_unlock();
 
     return NETDEV_TX_OK;
 }
 
 struct sk_buff *
 ieee80211_build_data_template(struct ieee80211_sub_if_data *sdata,
                   struct sk_buff *skb, u32 info_flags)
 {
     struct ieee80211_hdr *hdr;
     struct ieee80211_tx_data tx = {
         .local = sdata->local,
         .sdata = sdata,
     };
     struct sta_info *sta;
 
     rcu_read_lock();
 
     if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
         kfree_skb(skb);
         skb = ERR_PTR(-EINVAL);
         goto out;
     }
 
     skb = ieee80211_build_hdr(sdata, skb, info_flags, sta,
                   IEEE80211_TX_CTRL_MLO_LINK_UNSPEC, NULL);
     if (IS_ERR(skb))
         goto out;
 
     hdr = (void *)skb->data;
     tx.sta = sta_info_get(sdata, hdr->addr1);
     tx.skb = skb;
 
     if (ieee80211_tx_h_select_key(&tx) != TX_CONTINUE) {
         rcu_read_unlock();
         kfree_skb(skb);
         return ERR_PTR(-EINVAL);
     }
 
 out:
     rcu_read_unlock();
     return skb;
 }
 
 /*
  * ieee80211_clear_tx_pending may not be called in a context where
  * it is possible that it packets could come in again.
  */
 void ieee80211_clear_tx_pending(struct ieee80211_local *local)
 {
     struct sk_buff *skb;
     int i;
 
     for (i = 0; i < local->hw.queues; i++) {
         while ((skb = skb_dequeue(&local->pending[i])) != NULL)
             ieee80211_free_txskb(&local->hw, skb);
     }
 }
 
 /*
  * Returns false if the frame couldn't be transmitted but was queued instead,
  * which in this case means re-queued -- take as an indication to stop sending
  * more pending frames.
  */
 static bool ieee80211_tx_pending_skb(struct ieee80211_local *local,
                      struct sk_buff *skb)
 {
     struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
     struct ieee80211_sub_if_data *sdata;
     struct sta_info *sta;
     struct ieee80211_hdr *hdr;
     bool result;
     struct ieee80211_chanctx_conf *chanctx_conf;
 
     sdata = vif_to_sdata(info->control.vif);
 
     if (info->control.flags & IEEE80211_TX_INTCFL_NEED_TXPROCESSING) {
         /* update band only for non-MLD */
         if (!sdata->vif.valid_links) {
             chanctx_conf =
                 rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
             if (unlikely(!chanctx_conf)) {
                 dev_kfree_skb(skb);
                 return true;
             }
             info->band = chanctx_conf->def.chan->band;
         }
         result = ieee80211_tx(sdata, NULL, skb, true);
     } else if (info->flags & IEEE80211_TX_CTL_HW_80211_ENCAP) {
         if (ieee80211_lookup_ra_sta(sdata, skb, &sta)) {
             dev_kfree_skb(skb);
             return true;
         }
 
         if (IS_ERR(sta) || (sta && !sta->uploaded))
             sta = NULL;
 
         result = ieee80211_tx_8023(sdata, skb, sta, true);
     } else {
         struct sk_buff_head skbs;
 
         __skb_queue_head_init(&skbs);
         __skb_queue_tail(&skbs, skb);
 
         hdr = (struct ieee80211_hdr *)skb->data;
         sta = sta_info_get(sdata, hdr->addr1);
 
         result = __ieee80211_tx(local, &skbs, sta, true);
     }
 
     return result;
 }
 
 /*
  * Transmit all pending packets. Called from tasklet.
  */
 void ieee80211_tx_pending(struct tasklet_struct *t)
 {
     struct ieee80211_local *local = from_tasklet(local, t,
                              tx_pending_tasklet);
     unsigned long flags;
     int i;
     bool txok;
 
     rcu_read_lock();
 
     spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
     for (i = 0; i < local->hw.queues; i++) {
         /*
          * If queue is stopped by something other than due to pending
          * frames, or we have no pending frames, proceed to next queue.
          */
         if (local->queue_stop_reasons[i] ||
             skb_queue_empty(&local->pending[i]))
             continue;
 
         while (!skb_queue_empty(&local->pending[i])) {
             struct sk_buff *skb = __skb_dequeue(&local->pending[i]);
             struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 
             if (WARN_ON(!info->control.vif)) {
                 ieee80211_free_txskb(&local->hw, skb);
                 continue;
             }
 
             spin_unlock_irqrestore(&local->queue_stop_reason_lock,
                         flags);
 
             txok = ieee80211_tx_pending_skb(local, skb);
             spin_lock_irqsave(&local->queue_stop_reason_lock,
                       flags);
             if (!txok)
                 break;
         }
 
         if (skb_queue_empty(&local->pending[i]))
             ieee80211_propagate_queue_wake(local, i);
     }
     spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 
     rcu_read_unlock();
 }
 
 /* functions for drivers to get certain frames */
 
 static void __ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
                        struct ieee80211_link_data *link,
                        struct ps_data *ps, struct sk_buff *skb,
                        bool is_template)
 {
     u8 *pos, *tim;
     int aid0 = 0;
     int i, have_bits = 0, n1, n2;
     struct ieee80211_bss_conf *link_conf = link->conf;
 
     /* Generate bitmap for TIM only if there are any STAs in power save
      * mode. */
     if (atomic_read(&ps->num_sta_ps) > 0)
         /* in the hope that this is faster than
          * checking byte-for-byte */
         have_bits = !bitmap_empty((unsigned long *)ps->tim,
                       IEEE80211_MAX_AID+1);
     if (!is_template) {
         if (ps->dtim_count == 0)
             ps->dtim_count = link_conf->dtim_period - 1;
         else
             ps->dtim_count--;
     }
 
     tim = pos = skb_put(skb, 6);
     *pos++ = WLAN_EID_TIM;
     *pos++ = 4;
     *pos++ = ps->dtim_count;
     *pos++ = link_conf->dtim_period;
 
     if (ps->dtim_count == 0 && !skb_queue_empty(&ps->bc_buf))
         aid0 = 1;
 
     ps->dtim_bc_mc = aid0 == 1;
 
     if (have_bits) {
         /* Find largest even number N1 so that bits numbered 1 through
          * (N1 x 8) - 1 in the bitmap are 0 and number N2 so that bits
          * (N2 + 1) x 8 through 2007 are 0. */
         n1 = 0;
         for (i = 0; i < IEEE80211_MAX_TIM_LEN; i++) {
             if (ps->tim[i]) {
                 n1 = i & 0xfe;
                 break;
             }
         }
         n2 = n1;
         for (i = IEEE80211_MAX_TIM_LEN - 1; i >= n1; i--) {
             if (ps->tim[i]) {
                 n2 = i;
                 break;
             }
         }
 
         /* Bitmap control */
         *pos++ = n1 | aid0;
         /* Part Virt Bitmap */
         skb_put(skb, n2 - n1);
         memcpy(pos, ps->tim + n1, n2 - n1 + 1);
 
         tim[1] = n2 - n1 + 4;
     } else {
         *pos++ = aid0; /* Bitmap control */
         *pos++ = 0; /* Part Virt Bitmap */
     }
 }
 
 static int ieee80211_beacon_add_tim(struct ieee80211_sub_if_data *sdata,
                     struct ieee80211_link_data *link,
                     struct ps_data *ps, struct sk_buff *skb,
                     bool is_template)
 {
     struct ieee80211_local *local = sdata->local;
 
     /*
      * Not very nice, but we want to allow the driver to call
      * ieee80211_beacon_get() as a response to the set_tim()
      * callback. That, however, is already invoked under the
      * sta_lock to guarantee consistent and race-free update
      * of the tim bitmap in mac80211 and the driver.
      */
     if (local->tim_in_locked_section) {
         __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template);
     } else {
         spin_lock_bh(&local->tim_lock);
         __ieee80211_beacon_add_tim(sdata, link, ps, skb, is_template);
         spin_unlock_bh(&local->tim_lock);
     }
 
     return 0;
 }
 
 static void ieee80211_set_beacon_cntdwn(struct ieee80211_sub_if_data *sdata,
                     struct beacon_data *beacon,
                     struct ieee80211_link_data *link)
 {
     u8 *beacon_data, count, max_count = 1;
     struct probe_resp *resp;
     size_t beacon_data_len;
     u16 *bcn_offsets;
     int i;
 
     switch (sdata->vif.type) {
     case NL80211_IFTYPE_AP:
         beacon_data = beacon->tail;
         beacon_data_len = beacon->tail_len;
         break;
     case NL80211_IFTYPE_ADHOC:
         beacon_data = beacon->head;
         beacon_data_len = beacon->head_len;
         break;
     case NL80211_IFTYPE_MESH_POINT:
         beacon_data = beacon->head;
         beacon_data_len = beacon->head_len;
         break;
     default:
         return;
     }
 
     resp = rcu_dereference(link->u.ap.probe_resp);
 
     bcn_offsets = beacon->cntdwn_counter_offsets;
     count = beacon->cntdwn_current_counter;
     if (link->conf->csa_active)
         max_count = IEEE80211_MAX_CNTDWN_COUNTERS_NUM;
 
     for (i = 0; i < max_count; ++i) {
         if (bcn_offsets[i]) {
             if (WARN_ON_ONCE(bcn_offsets[i] >= beacon_data_len))
                 return;
             beacon_data[bcn_offsets[i]] = count;
         }
 
         if (sdata->vif.type == NL80211_IFTYPE_AP && resp) {
             u16 *resp_offsets = resp->cntdwn_counter_offsets;
 
             resp->data[resp_offsets[i]] = count;
         }
     }
 }
 
 static u8 __ieee80211_beacon_update_cntdwn(struct beacon_data *beacon)
 {
     beacon->cntdwn_current_counter--;
 
     /* the counter should never reach 0 */
     WARN_ON_ONCE(!beacon->cntdwn_current_counter);
 
     return beacon->cntdwn_current_counter;
 }
 
 u8 ieee80211_beacon_update_cntdwn(struct ieee80211_vif *vif)
 {
     struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
     struct beacon_data *beacon = NULL;
     u8 count = 0;
 
     rcu_read_lock();
 
     if (sdata->vif.type == NL80211_IFTYPE_AP)
         beacon = rcu_dereference(sdata->deflink.u.ap.beacon);
     else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
         beacon = rcu_dereference(sdata->u.ibss.presp);
     else if (ieee80211_vif_is_mesh(&sdata->vif))
         beacon = rcu_dereference(sdata->u.mesh.beacon);
 
     if (!beacon)
         goto unlock;
 
     count = __ieee80211_beacon_update_cntdwn(beacon);
 
 unlock:
     rcu_read_unlock();
     return count;
 }
 EXPORT_SYMBOL(ieee80211_beacon_update_cntdwn);
 
 void ieee80211_beacon_set_cntdwn(struct ieee80211_vif *vif, u8 counter)
 {
     struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
     struct beacon_data *beacon = NULL;
 
     rcu_read_lock();
 
     if (sdata->vif.type == NL80211_IFTYPE_AP)
         beacon = rcu_dereference(sdata->deflink.u.ap.beacon);
     else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
         beacon = rcu_dereference(sdata->u.ibss.presp);
     else if (ieee80211_vif_is_mesh(&sdata->vif))
         beacon = rcu_dereference(sdata->u.mesh.beacon);
 
     if (!beacon)
         goto unlock;
 
     if (counter < beacon->cntdwn_current_counter)
         beacon->cntdwn_current_counter = counter;
 
 unlock:
     rcu_read_unlock();
 }
 EXPORT_SYMBOL(ieee80211_beacon_set_cntdwn);
 
 bool ieee80211_beacon_cntdwn_is_complete(struct ieee80211_vif *vif)
 {
     struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
     struct beacon_data *beacon = NULL;
     u8 *beacon_data;
     size_t beacon_data_len;
     int ret = false;
 
     if (!ieee80211_sdata_running(sdata))
         return false;
 
     rcu_read_lock();
     if (vif->type == NL80211_IFTYPE_AP) {
         beacon = rcu_dereference(sdata->deflink.u.ap.beacon);
         if (WARN_ON(!beacon || !beacon->tail))
             goto out;
         beacon_data = beacon->tail;
         beacon_data_len = beacon->tail_len;
     } else if (vif->type == NL80211_IFTYPE_ADHOC) {
         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
 
         beacon = rcu_dereference(ifibss->presp);
         if (!beacon)
             goto out;
 
         beacon_data = beacon->head;
         beacon_data_len = beacon->head_len;
     } else if (vif->type == NL80211_IFTYPE_MESH_POINT) {
         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 
         beacon = rcu_dereference(ifmsh->beacon);
         if (!beacon)
             goto out;
 
         beacon_data = beacon->head;
         beacon_data_len = beacon->head_len;
     } else {
         WARN_ON(1);
         goto out;
     }
 
     if (!beacon->cntdwn_counter_offsets[0])
         goto out;
 
     if (WARN_ON_ONCE(beacon->cntdwn_counter_offsets[0] > beacon_data_len))
         goto out;
 
     if (beacon_data[beacon->cntdwn_counter_offsets[0]] == 1)
         ret = true;
 
  out:
     rcu_read_unlock();
 
     return ret;
 }
 EXPORT_SYMBOL(ieee80211_beacon_cntdwn_is_complete);
 
 static int ieee80211_beacon_protect(struct sk_buff *skb,
                     struct ieee80211_local *local,
                     struct ieee80211_sub_if_data *sdata,
                     struct ieee80211_link_data *link)
 {
     ieee80211_tx_result res;
     struct ieee80211_tx_data tx;
     struct sk_buff *check_skb;
 
     memset(&tx, 0, sizeof(tx));
     tx.key = rcu_dereference(link->default_beacon_key);
     if (!tx.key)
         return 0;
     tx.local = local;
     tx.sdata = sdata;
     __skb_queue_head_init(&tx.skbs);
     __skb_queue_tail(&tx.skbs, skb);
     res = ieee80211_tx_h_encrypt(&tx);
     check_skb = __skb_dequeue(&tx.skbs);
     /* we may crash after this, but it'd be a bug in crypto */
     WARN_ON(check_skb != skb);
     if (WARN_ON_ONCE(res != TX_CONTINUE))
         return -EINVAL;
 
     return 0;
 }
 
 static void
 ieee80211_beacon_get_finish(struct ieee80211_hw *hw,
                 struct ieee80211_vif *vif,
                 struct ieee80211_link_data *link,
                 struct ieee80211_mutable_offsets *offs,
                 struct beacon_data *beacon,
                 struct sk_buff *skb,
                 struct ieee80211_chanctx_conf *chanctx_conf,
                 u16 csa_off_base)
 {
     struct ieee80211_local *local = hw_to_local(hw);
     struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
     struct ieee80211_tx_info *info;
     enum nl80211_band band;
     struct ieee80211_tx_rate_control txrc;
 
     /* CSA offsets */
     if (offs && beacon) {
         u16 i;
 
         for (i = 0; i < IEEE80211_MAX_CNTDWN_COUNTERS_NUM; i++) {
             u16 csa_off = beacon->cntdwn_counter_offsets[i];
 
             if (!csa_off)
                 continue;
 
             offs->cntdwn_counter_offs[i] = csa_off_base + csa_off;
         }
     }
 
     band = chanctx_conf->def.chan->band;
     info = IEEE80211_SKB_CB(skb);
     info->flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
     info->flags |= IEEE80211_TX_CTL_NO_ACK;
     info->band = band;
 
     memset(&txrc, 0, sizeof(txrc));
     txrc.hw = hw;
     txrc.sband = local->hw.wiphy->bands[band];
     txrc.bss_conf = link->conf;
     txrc.skb = skb;
     txrc.reported_rate.idx = -1;
     if (sdata->beacon_rate_set && sdata->beacon_rateidx_mask[band])
         txrc.rate_idx_mask = sdata->beacon_rateidx_mask[band];
     else
         txrc.rate_idx_mask = sdata->rc_rateidx_mask[band];
     txrc.bss = true;
     rate_control_get_rate(sdata, NULL, &txrc);
 
     info->control.vif = vif;
     info->flags |= IEEE80211_TX_CTL_CLEAR_PS_FILT |
                IEEE80211_TX_CTL_ASSIGN_SEQ |
                IEEE80211_TX_CTL_FIRST_FRAGMENT;
 }
 
 static void
 ieee80211_beacon_add_mbssid(struct sk_buff *skb, struct beacon_data *beacon)
 {
     int i;
 
     if (!beacon->mbssid_ies)
         return;
 
     for (i = 0; i < beacon->mbssid_ies->cnt; i++)
         skb_put_data(skb, beacon->mbssid_ies->elem[i].data,
                  beacon->mbssid_ies->elem[i].len);
 }
 
 static struct sk_buff *
 ieee80211_beacon_get_ap(struct ieee80211_hw *hw,
             struct ieee80211_vif *vif,
             struct ieee80211_link_data *link,
             struct ieee80211_mutable_offsets *offs,
             bool is_template,
             struct beacon_data *beacon,
             struct ieee80211_chanctx_conf *chanctx_conf)
 {
     struct ieee80211_local *local = hw_to_local(hw);
     struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
     struct ieee80211_if_ap *ap = &sdata->u.ap;
     struct sk_buff *skb = NULL;
     u16 csa_off_base = 0;
     int mbssid_len;
 
     if (beacon->cntdwn_counter_offsets[0]) {
         if (!is_template)
             ieee80211_beacon_update_cntdwn(vif);
 
         ieee80211_set_beacon_cntdwn(sdata, beacon, link);
     }
 
     /* headroom, head length,
      * tail length, maximum TIM length and multiple BSSID length
      */
     mbssid_len = ieee80211_get_mbssid_beacon_len(beacon->mbssid_ies);
     skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
                 beacon->tail_len + 256 +
                 local->hw.extra_beacon_tailroom + mbssid_len);
     if (!skb)
         return NULL;
 
     skb_reserve(skb, local->tx_headroom);
     skb_put_data(skb, beacon->head, beacon->head_len);
 
     ieee80211_beacon_add_tim(sdata, link, &ap->ps, skb, is_template);
 
     if (offs) {
         offs->tim_offset = beacon->head_len;
         offs->tim_length = skb->len - beacon->head_len;
         offs->cntdwn_counter_offs[0] = beacon->cntdwn_counter_offsets[0];
 
         if (mbssid_len) {
             ieee80211_beacon_add_mbssid(skb, beacon);
             offs->mbssid_off = skb->len - mbssid_len;
         }
 
         /* for AP the csa offsets are from tail */
         csa_off_base = skb->len;
     }
 
     if (beacon->tail)
         skb_put_data(skb, beacon->tail, beacon->tail_len);
 
     if (ieee80211_beacon_protect(skb, local, sdata, link) < 0)
         return NULL;
 
     ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb,
                     chanctx_conf, csa_off_base);
     return skb;
 }
 
 static struct sk_buff *
 __ieee80211_beacon_get(struct ieee80211_hw *hw,
                struct ieee80211_vif *vif,
                struct ieee80211_mutable_offsets *offs,
                bool is_template,
                unsigned int link_id)
 {
     struct ieee80211_local *local = hw_to_local(hw);
     struct beacon_data *beacon = NULL;
     struct sk_buff *skb = NULL;
     struct ieee80211_sub_if_data *sdata = NULL;
     struct ieee80211_chanctx_conf *chanctx_conf;
     struct ieee80211_link_data *link;
 
     rcu_read_lock();
 
     sdata = vif_to_sdata(vif);
     link = rcu_dereference(sdata->link[link_id]);
     if (!link)
         goto out;
     chanctx_conf =
         rcu_dereference(link->conf->chanctx_conf);
 
     if (!ieee80211_sdata_running(sdata) || !chanctx_conf)
         goto out;
 
     if (offs)
         memset(offs, 0, sizeof(*offs));
 
     if (sdata->vif.type == NL80211_IFTYPE_AP) {
         beacon = rcu_dereference(link->u.ap.beacon);
         if (!beacon)
             goto out;
 
         skb = ieee80211_beacon_get_ap(hw, vif, link, offs, is_template,
                           beacon, chanctx_conf);
     } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
         struct ieee80211_if_ibss *ifibss = &sdata->u.ibss;
         struct ieee80211_hdr *hdr;
 
         beacon = rcu_dereference(ifibss->presp);
         if (!beacon)
             goto out;
 
         if (beacon->cntdwn_counter_offsets[0]) {
             if (!is_template)
                 __ieee80211_beacon_update_cntdwn(beacon);
 
             ieee80211_set_beacon_cntdwn(sdata, beacon, link);
         }
 
         skb = dev_alloc_skb(local->tx_headroom + beacon->head_len +
                     local->hw.extra_beacon_tailroom);
         if (!skb)
             goto out;
         skb_reserve(skb, local->tx_headroom);
         skb_put_data(skb, beacon->head, beacon->head_len);
 
         hdr = (struct ieee80211_hdr *) skb->data;
         hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
                          IEEE80211_STYPE_BEACON);
 
         ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb,
                         chanctx_conf, 0);
     } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
         struct ieee80211_if_mesh *ifmsh = &sdata->u.mesh;
 
         beacon = rcu_dereference(ifmsh->beacon);
         if (!beacon)
             goto out;
 
         if (beacon->cntdwn_counter_offsets[0]) {
             if (!is_template)
                 /* TODO: For mesh csa_counter is in TU, so
                  * decrementing it by one isn't correct, but
                  * for now we leave it consistent with overall
                  * mac80211's behavior.
                  */
                 __ieee80211_beacon_update_cntdwn(beacon);
 
             ieee80211_set_beacon_cntdwn(sdata, beacon, link);
         }
 
         if (ifmsh->sync_ops)
             ifmsh->sync_ops->adjust_tsf(sdata, beacon);
 
         skb = dev_alloc_skb(local->tx_headroom +
                     beacon->head_len +
                     256 + /* TIM IE */
                     beacon->tail_len +
                     local->hw.extra_beacon_tailroom);
         if (!skb)
             goto out;
         skb_reserve(skb, local->tx_headroom);
         skb_put_data(skb, beacon->head, beacon->head_len);
         ieee80211_beacon_add_tim(sdata, link, &ifmsh->ps, skb,
                      is_template);
 
         if (offs) {
             offs->tim_offset = beacon->head_len;
             offs->tim_length = skb->len - beacon->head_len;
         }
 
         skb_put_data(skb, beacon->tail, beacon->tail_len);
         ieee80211_beacon_get_finish(hw, vif, link, offs, beacon, skb,
                         chanctx_conf, 0);
     } else {
         WARN_ON(1);
         goto out;
     }
 
  out:
     rcu_read_unlock();
     return skb;
 
 }
 
 struct sk_buff *
 ieee80211_beacon_get_template(struct ieee80211_hw *hw,
                   struct ieee80211_vif *vif,
                   struct ieee80211_mutable_offsets *offs,
                   unsigned int link_id)
 {
     return __ieee80211_beacon_get(hw, vif, offs, true, link_id);
 }
 EXPORT_SYMBOL(ieee80211_beacon_get_template);
 
 struct sk_buff *ieee80211_beacon_get_tim(struct ieee80211_hw *hw,
                      struct ieee80211_vif *vif,
                      u16 *tim_offset, u16 *tim_length,
                      unsigned int link_id)
 {
     struct ieee80211_mutable_offsets offs = {};
     struct sk_buff *bcn = __ieee80211_beacon_get(hw, vif, &offs, false,
                              link_id);
     struct sk_buff *copy;
     int shift;
 
     if (!bcn)
         return bcn;
 
     if (tim_offset)
         *tim_offset = offs.tim_offset;
 
     if (tim_length)
         *tim_length = offs.tim_length;
 
     if (ieee80211_hw_check(hw, BEACON_TX_STATUS) ||
         !hw_to_local(hw)->monitors)
         return bcn;
 
     /* send a copy to monitor interfaces */
     copy = skb_copy(bcn, GFP_ATOMIC);
     if (!copy)
         return bcn;
 
     shift = ieee80211_vif_get_shift(vif);
     ieee80211_tx_monitor(hw_to_local(hw), copy, 1, shift, false, NULL);
 
     return bcn;
 }
 EXPORT_SYMBOL(ieee80211_beacon_get_tim);
 
 struct sk_buff *ieee80211_proberesp_get(struct ieee80211_hw *hw,
                     struct ieee80211_vif *vif)
 {
     struct sk_buff *skb = NULL;
     struct probe_resp *presp = NULL;
     struct ieee80211_hdr *hdr;
     struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 
     if (sdata->vif.type != NL80211_IFTYPE_AP)
         return NULL;
 
     rcu_read_lock();
     presp = rcu_dereference(sdata->deflink.u.ap.probe_resp);
     if (!presp)
         goto out;
 
     skb = dev_alloc_skb(presp->len);
     if (!skb)
         goto out;
 
     skb_put_data(skb, presp->data, presp->len);
 
     hdr = (struct ieee80211_hdr *) skb->data;
     memset(hdr->addr1, 0, sizeof(hdr->addr1));
 
 out:
     rcu_read_unlock();
     return skb;
 }
 EXPORT_SYMBOL(ieee80211_proberesp_get);
 
 struct sk_buff *ieee80211_get_fils_discovery_tmpl(struct ieee80211_hw *hw,
                           struct ieee80211_vif *vif)
 {
     struct sk_buff *skb = NULL;
     struct fils_discovery_data *tmpl = NULL;
     struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 
     if (sdata->vif.type != NL80211_IFTYPE_AP)
         return NULL;
 
     rcu_read_lock();
     tmpl = rcu_dereference(sdata->deflink.u.ap.fils_discovery);
     if (!tmpl) {
         rcu_read_unlock();
         return NULL;
     }
 
     skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len);
     if (skb) {
         skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
         skb_put_data(skb, tmpl->data, tmpl->len);
     }
 
     rcu_read_unlock();
     return skb;
 }
 EXPORT_SYMBOL(ieee80211_get_fils_discovery_tmpl);
 
 struct sk_buff *
 ieee80211_get_unsol_bcast_probe_resp_tmpl(struct ieee80211_hw *hw,
                       struct ieee80211_vif *vif)
 {
     struct sk_buff *skb = NULL;
     struct unsol_bcast_probe_resp_data *tmpl = NULL;
     struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
 
     if (sdata->vif.type != NL80211_IFTYPE_AP)
         return NULL;
 
     rcu_read_lock();
     tmpl = rcu_dereference(sdata->deflink.u.ap.unsol_bcast_probe_resp);
     if (!tmpl) {
         rcu_read_unlock();
         return NULL;
     }
 
     skb = dev_alloc_skb(sdata->local->hw.extra_tx_headroom + tmpl->len);
     if (skb) {
         skb_reserve(skb, sdata->local->hw.extra_tx_headroom);
         skb_put_data(skb, tmpl->data, tmpl->len);
     }
 
     rcu_read_unlock();
     return skb;
 }
 EXPORT_SYMBOL(ieee80211_get_unsol_bcast_probe_resp_tmpl);
 
 struct sk_buff *ieee80211_pspoll_get(struct ieee80211_hw *hw,
                      struct ieee80211_vif *vif)
 {
     struct ieee80211_sub_if_data *sdata;
     struct ieee80211_pspoll *pspoll;
     struct ieee80211_local *local;
     struct sk_buff *skb;
 
     if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
         return NULL;
 
     sdata = vif_to_sdata(vif);
     local = sdata->local;
 
     skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*pspoll));
     if (!skb)
         return NULL;
 
     skb_reserve(skb, local->hw.extra_tx_headroom);
 
     pspoll = skb_put_zero(skb, sizeof(*pspoll));
     pspoll->frame_control = cpu_to_le16(IEEE80211_FTYPE_CTL |
                         IEEE80211_STYPE_PSPOLL);
     pspoll->aid = cpu_to_le16(sdata->vif.cfg.aid);
 
     /* aid in PS-Poll has its two MSBs each set to 1 */
     pspoll->aid |= cpu_to_le16(1 << 15 | 1 << 14);
 
     memcpy(pspoll->bssid, sdata->deflink.u.mgd.bssid, ETH_ALEN);
     memcpy(pspoll->ta, vif->addr, ETH_ALEN);
 
     return skb;
 }
 EXPORT_SYMBOL(ieee80211_pspoll_get);
 
 struct sk_buff *ieee80211_nullfunc_get(struct ieee80211_hw *hw,
                        struct ieee80211_vif *vif,
                        bool qos_ok)
 {
     struct ieee80211_hdr_3addr *nullfunc;
     struct ieee80211_sub_if_data *sdata;
     struct ieee80211_local *local;
     struct sk_buff *skb;
     bool qos = false;
 
     if (WARN_ON(vif->type != NL80211_IFTYPE_STATION))
         return NULL;
 
     sdata = vif_to_sdata(vif);
     local = sdata->local;
 
     if (qos_ok) {
         struct sta_info *sta;
 
         rcu_read_lock();
         sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid);
         qos = sta && sta->sta.wme;
         rcu_read_unlock();
     }
 
     skb = dev_alloc_skb(local->hw.extra_tx_headroom +
                 sizeof(*nullfunc) + 2);
     if (!skb)
         return NULL;
 
     skb_reserve(skb, local->hw.extra_tx_headroom);
 
     nullfunc = skb_put_zero(skb, sizeof(*nullfunc));
     nullfunc->frame_control = cpu_to_le16(IEEE80211_FTYPE_DATA |
                           IEEE80211_STYPE_NULLFUNC |
                           IEEE80211_FCTL_TODS);
     if (qos) {
         __le16 qoshdr = cpu_to_le16(7);
 
         BUILD_BUG_ON((IEEE80211_STYPE_QOS_NULLFUNC |
                   IEEE80211_STYPE_NULLFUNC) !=
                  IEEE80211_STYPE_QOS_NULLFUNC);
         nullfunc->frame_control |=
             cpu_to_le16(IEEE80211_STYPE_QOS_NULLFUNC);
         skb->priority = 7;
         skb_set_queue_mapping(skb, IEEE80211_AC_VO);
         skb_put_data(skb, &qoshdr, sizeof(qoshdr));
     }
 
     memcpy(nullfunc->addr1, sdata->deflink.u.mgd.bssid, ETH_ALEN);
     memcpy(nullfunc->addr2, vif->addr, ETH_ALEN);
     memcpy(nullfunc->addr3, sdata->deflink.u.mgd.bssid, ETH_ALEN);
 
     return skb;
 }
 EXPORT_SYMBOL(ieee80211_nullfunc_get);
 
 struct sk_buff *ieee80211_probereq_get(struct ieee80211_hw *hw,
                        const u8 *src_addr,
                        const u8 *ssid, size_t ssid_len,
                        size_t tailroom)
 {
     struct ieee80211_local *local = hw_to_local(hw);
     struct ieee80211_hdr_3addr *hdr;
     struct sk_buff *skb;
     size_t ie_ssid_len;
     u8 *pos;
 
     ie_ssid_len = 2 + ssid_len;
 
     skb = dev_alloc_skb(local->hw.extra_tx_headroom + sizeof(*hdr) +
                 ie_ssid_len + tailroom);
     if (!skb)
         return NULL;
 
     skb_reserve(skb, local->hw.extra_tx_headroom);
 
     hdr = skb_put_zero(skb, sizeof(*hdr));
     hdr->frame_control = cpu_to_le16(IEEE80211_FTYPE_MGMT |
                      IEEE80211_STYPE_PROBE_REQ);
     eth_broadcast_addr(hdr->addr1);
     memcpy(hdr->addr2, src_addr, ETH_ALEN);
     eth_broadcast_addr(hdr->addr3);
 
     pos = skb_put(skb, ie_ssid_len);
     *pos++ = WLAN_EID_SSID;
     *pos++ = ssid_len;
     if (ssid_len)
         memcpy(pos, ssid, ssid_len);
     pos += ssid_len;
 
     return skb;
 }
 EXPORT_SYMBOL(ieee80211_probereq_get);
 
 void ieee80211_rts_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
                const void *frame, size_t frame_len,
                const struct ieee80211_tx_info *frame_txctl,
                struct ieee80211_rts *rts)
 {
     const struct ieee80211_hdr *hdr = frame;
 
     rts->frame_control =
         cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_RTS);
     rts->duration = ieee80211_rts_duration(hw, vif, frame_len,
                            frame_txctl);
     memcpy(rts->ra, hdr->addr1, sizeof(rts->ra));
     memcpy(rts->ta, hdr->addr2, sizeof(rts->ta));
 }
 EXPORT_SYMBOL(ieee80211_rts_get);
 
 void ieee80211_ctstoself_get(struct ieee80211_hw *hw, struct ieee80211_vif *vif,
                  const void *frame, size_t frame_len,
                  const struct ieee80211_tx_info *frame_txctl,
                  struct ieee80211_cts *cts)
 {
     const struct ieee80211_hdr *hdr = frame;
 
     cts->frame_control =
         cpu_to_le16(IEEE80211_FTYPE_CTL | IEEE80211_STYPE_CTS);
     cts->duration = ieee80211_ctstoself_duration(hw, vif,
                              frame_len, frame_txctl);
     memcpy(cts->ra, hdr->addr1, sizeof(cts->ra));
 }
 EXPORT_SYMBOL(ieee80211_ctstoself_get);
 
 struct sk_buff *
 ieee80211_get_buffered_bc(struct ieee80211_hw *hw,
               struct ieee80211_vif *vif)
 {
     struct ieee80211_local *local = hw_to_local(hw);
     struct sk_buff *skb = NULL;
     struct ieee80211_tx_data tx;
     struct ieee80211_sub_if_data *sdata;
     struct ps_data *ps;
     struct ieee80211_tx_info *info;
     struct ieee80211_chanctx_conf *chanctx_conf;
 
     sdata = vif_to_sdata(vif);
 
     rcu_read_lock();
     chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
 
     if (!chanctx_conf)
         goto out;
 
     if (sdata->vif.type == NL80211_IFTYPE_AP) {
         struct beacon_data *beacon =
                 rcu_dereference(sdata->deflink.u.ap.beacon);
 
         if (!beacon || !beacon->head)
             goto out;
 
         ps = &sdata->u.ap.ps;
     } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
         ps = &sdata->u.mesh.ps;
     } else {
         goto out;
     }
 
     if (ps->dtim_count != 0 || !ps->dtim_bc_mc)
         goto out; /* send buffered bc/mc only after DTIM beacon */
 
     while (1) {
         skb = skb_dequeue(&ps->bc_buf);
         if (!skb)
             goto out;
         local->total_ps_buffered--;
 
         if (!skb_queue_empty(&ps->bc_buf) && skb->len >= 2) {
             struct ieee80211_hdr *hdr =
                 (struct ieee80211_hdr *) skb->data;
             /* more buffered multicast/broadcast frames ==> set
              * MoreData flag in IEEE 802.11 header to inform PS
              * STAs */
             hdr->frame_control |=
                 cpu_to_le16(IEEE80211_FCTL_MOREDATA);
         }
 
         if (sdata->vif.type == NL80211_IFTYPE_AP)
             sdata = IEEE80211_DEV_TO_SUB_IF(skb->dev);
         if (!ieee80211_tx_prepare(sdata, &tx, NULL, skb))
             break;
         ieee80211_free_txskb(hw, skb);
     }
 
     info = IEEE80211_SKB_CB(skb);
 
     tx.flags |= IEEE80211_TX_PS_BUFFERED;
     info->band = chanctx_conf->def.chan->band;
 
     if (invoke_tx_handlers(&tx))
         skb = NULL;
  out:
     rcu_read_unlock();
 
     return skb;
 }
 EXPORT_SYMBOL(ieee80211_get_buffered_bc);
 
 int ieee80211_reserve_tid(struct ieee80211_sta *pubsta, u8 tid)
 {
     struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
     struct ieee80211_sub_if_data *sdata = sta->sdata;
     struct ieee80211_local *local = sdata->local;
     int ret;
     u32 queues;
 
     lockdep_assert_held(&local->sta_mtx);
 
     /* only some cases are supported right now */
     switch (sdata->vif.type) {
     case NL80211_IFTYPE_STATION:
     case NL80211_IFTYPE_AP:
     case NL80211_IFTYPE_AP_VLAN:
         break;
     default:
         WARN_ON(1);
         return -EINVAL;
     }
 
     if (WARN_ON(tid >= IEEE80211_NUM_UPS))
         return -EINVAL;
 
     if (sta->reserved_tid == tid) {
         ret = 0;
         goto out;
     }
 
     if (sta->reserved_tid != IEEE80211_TID_UNRESERVED) {
         sdata_err(sdata, "TID reservation already active\n");
         ret = -EALREADY;
         goto out;
     }
 
     ieee80211_stop_vif_queues(sdata->local, sdata,
                   IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
 
     synchronize_net();
 
     /* Tear down BA sessions so we stop aggregating on this TID */
     if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION)) {
         set_sta_flag(sta, WLAN_STA_BLOCK_BA);
         __ieee80211_stop_tx_ba_session(sta, tid,
                            AGG_STOP_LOCAL_REQUEST);
     }
 
     queues = BIT(sdata->vif.hw_queue[ieee802_1d_to_ac[tid]]);
     __ieee80211_flush_queues(local, sdata, queues, false);
 
     sta->reserved_tid = tid;
 
     ieee80211_wake_vif_queues(local, sdata,
                   IEEE80211_QUEUE_STOP_REASON_RESERVE_TID);
 
     if (ieee80211_hw_check(&local->hw, AMPDU_AGGREGATION))
         clear_sta_flag(sta, WLAN_STA_BLOCK_BA);
 
     ret = 0;
  out:
     return ret;
 }
 EXPORT_SYMBOL(ieee80211_reserve_tid);
 
 void ieee80211_unreserve_tid(struct ieee80211_sta *pubsta, u8 tid)
 {
     struct sta_info *sta = container_of(pubsta, struct sta_info, sta);
     struct ieee80211_sub_if_data *sdata = sta->sdata;
 
     lockdep_assert_held(&sdata->local->sta_mtx);
 
     /* only some cases are supported right now */
     switch (sdata->vif.type) {
     case NL80211_IFTYPE_STATION:
     case NL80211_IFTYPE_AP:
     case NL80211_IFTYPE_AP_VLAN:
         break;
     default:
         WARN_ON(1);
         return;
     }
 
     if (tid != sta->reserved_tid) {
         sdata_err(sdata, "TID to unreserve (%d) isn't reserved\n", tid);
         return;
     }
 
     sta->reserved_tid = IEEE80211_TID_UNRESERVED;
 }
 EXPORT_SYMBOL(ieee80211_unreserve_tid);
 
 void __ieee80211_tx_skb_tid_band(struct ieee80211_sub_if_data *sdata,
                  struct sk_buff *skb, int tid, int link_id,
                  enum nl80211_band band)
 {
     const struct ieee80211_hdr *hdr = (void *)skb->data;
     int ac = ieee80211_ac_from_tid(tid);
     unsigned int link;
 
     skb_reset_mac_header(skb);
     skb_set_queue_mapping(skb, ac);
     skb->priority = tid;
 
     skb->dev = sdata->dev;
 
     BUILD_BUG_ON(IEEE80211_LINK_UNSPECIFIED < IEEE80211_MLD_MAX_NUM_LINKS);
     BUILD_BUG_ON(!FIELD_FIT(IEEE80211_TX_CTRL_MLO_LINK,
                 IEEE80211_LINK_UNSPECIFIED));
 
     if (!sdata->vif.valid_links) {
         link = 0;
     } else if (link_id >= 0) {
         link = link_id;
     } else if (memcmp(sdata->vif.addr, hdr->addr2, ETH_ALEN) == 0) {
         /* address from the MLD */
         link = IEEE80211_LINK_UNSPECIFIED;
     } else {
         /* otherwise must be addressed from a link */
         rcu_read_lock();
         for (link = 0; link < ARRAY_SIZE(sdata->vif.link_conf); link++) {
             struct ieee80211_bss_conf *link_conf;
 
             link_conf = rcu_dereference(sdata->vif.link_conf[link]);
             if (!link_conf)
                 continue;
             if (memcmp(link_conf->addr, hdr->addr2, ETH_ALEN) == 0)
                 break;
         }
         rcu_read_unlock();
 
         if (WARN_ON_ONCE(link == ARRAY_SIZE(sdata->vif.link_conf)))
             link = ffs(sdata->vif.valid_links) - 1;
     }
 
     IEEE80211_SKB_CB(skb)->control.flags |=
         u32_encode_bits(link, IEEE80211_TX_CTRL_MLO_LINK);
 
     /*
      * The other path calling ieee80211_xmit is from the tasklet,
      * and while we can handle concurrent transmissions locking
      * requirements are that we do not come into tx with bhs on.
      */
     local_bh_disable();
     IEEE80211_SKB_CB(skb)->band = band;
     ieee80211_xmit(sdata, NULL, skb);
     local_bh_enable();
 }
 
 void ieee80211_tx_skb_tid(struct ieee80211_sub_if_data *sdata,
               struct sk_buff *skb, int tid, int link_id)
 {
     struct ieee80211_chanctx_conf *chanctx_conf;
     enum nl80211_band band;
 
     rcu_read_lock();
     if (!sdata->vif.valid_links) {
         WARN_ON(link_id >= 0);
         chanctx_conf =
             rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
         if (WARN_ON(!chanctx_conf)) {
             rcu_read_unlock();
             kfree_skb(skb);
             return;
         }
         band = chanctx_conf->def.chan->band;
     } else {
         WARN_ON(link_id >= 0 &&
             !(sdata->vif.valid_links & BIT(link_id)));
         /* MLD transmissions must not rely on the band */
         band = 0;
     }
 
     __ieee80211_tx_skb_tid_band(sdata, skb, tid, link_id, band);
     rcu_read_unlock();
 }
 
 int ieee80211_tx_control_port(struct wiphy *wiphy, struct net_device *dev,
                   const u8 *buf, size_t len,
                   const u8 *dest, __be16 proto, bool unencrypted,
                   int link_id, u64 *cookie)
 {
     struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
     struct ieee80211_local *local = sdata->local;
     struct sta_info *sta;
     struct sk_buff *skb;
     struct ethhdr *ehdr;
     u32 ctrl_flags = 0;
     u32 flags = 0;
     int err;
 
     /* Only accept CONTROL_PORT_PROTOCOL configured in CONNECT/ASSOCIATE
      * or Pre-Authentication
      */
     if (proto != sdata->control_port_protocol &&
         proto != cpu_to_be16(ETH_P_PREAUTH))
         return -EINVAL;
 
     if (proto == sdata->control_port_protocol)
         ctrl_flags |= IEEE80211_TX_CTRL_PORT_CTRL_PROTO |
                   IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP;
 
     if (unencrypted)
         flags |= IEEE80211_TX_INTFL_DONT_ENCRYPT;
 
     if (cookie)
         ctrl_flags |= IEEE80211_TX_CTL_REQ_TX_STATUS;
 
     flags |= IEEE80211_TX_INTFL_NL80211_FRAME_TX;
 
     skb = dev_alloc_skb(local->hw.extra_tx_headroom +
                 sizeof(struct ethhdr) + len);
     if (!skb)
         return -ENOMEM;
 
     skb_reserve(skb, local->hw.extra_tx_headroom + sizeof(struct ethhdr));
 
     skb_put_data(skb, buf, len);
 
     ehdr = skb_push(skb, sizeof(struct ethhdr));
     memcpy(ehdr->h_dest, dest, ETH_ALEN);
 
     /* we may override the SA for MLO STA later */
     if (link_id < 0) {
         ctrl_flags |= u32_encode_bits(IEEE80211_LINK_UNSPECIFIED,
                           IEEE80211_TX_CTRL_MLO_LINK);
         memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN);
     } else {
         struct ieee80211_bss_conf *link_conf;
 
         ctrl_flags |= u32_encode_bits(link_id,
                           IEEE80211_TX_CTRL_MLO_LINK);
 
         rcu_read_lock();
         link_conf = rcu_dereference(sdata->vif.link_conf[link_id]);
         if (!link_conf) {
             dev_kfree_skb(skb);
             rcu_read_unlock();
             return -ENOLINK;
         }
         memcpy(ehdr->h_source, link_conf->addr, ETH_ALEN);
         rcu_read_unlock();
     }
 
     ehdr->h_proto = proto;
 
     skb->dev = dev;
     skb->protocol = proto;
     skb_reset_network_header(skb);
     skb_reset_mac_header(skb);
 
     if (local->hw.queues < IEEE80211_NUM_ACS)
         goto start_xmit;
 
     /* update QoS header to prioritize control port frames if possible,
      * priorization also happens for control port frames send over
      * AF_PACKET
      */
     rcu_read_lock();
     err = ieee80211_lookup_ra_sta(sdata, skb, &sta);
     if (err) {
         dev_kfree_skb(skb);
         rcu_read_unlock();
         return err;
     }
 
     if (!IS_ERR(sta)) {
         u16 queue = __ieee80211_select_queue(sdata, sta, skb);
 
         skb_set_queue_mapping(skb, queue);
         skb_get_hash(skb);
 
         /*
          * for MLO STA, the SA should be the AP MLD address, but
          * the link ID has been selected already
          */
         if (sta && sta->sta.mlo)
             memcpy(ehdr->h_source, sdata->vif.addr, ETH_ALEN);
     }
     rcu_read_unlock();
 
 start_xmit:
     /* mutex lock is only needed for incrementing the cookie counter */
     mutex_lock(&local->mtx);
 
     local_bh_disable();
     __ieee80211_subif_start_xmit(skb, skb->dev, flags, ctrl_flags, cookie);
     local_bh_enable();
 
     mutex_unlock(&local->mtx);
 
     return 0;
 }
 
 int ieee80211_probe_mesh_link(struct wiphy *wiphy, struct net_device *dev,
                   const u8 *buf, size_t len)
 {
     struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
     struct ieee80211_local *local = sdata->local;
     struct sk_buff *skb;
 
     skb = dev_alloc_skb(local->hw.extra_tx_headroom + len +
                 30 + /* header size */
                 18); /* 11s header size */
     if (!skb)
         return -ENOMEM;
 
     skb_reserve(skb, local->hw.extra_tx_headroom);
     skb_put_data(skb, buf, len);
 
     skb->dev = dev;
     skb->protocol = htons(ETH_P_802_3);
     skb_reset_network_header(skb);
     skb_reset_mac_header(skb);
 
     local_bh_disable();
     __ieee80211_subif_start_xmit(skb, skb->dev, 0,
                      IEEE80211_TX_CTRL_SKIP_MPATH_LOOKUP,
                      NULL);
     local_bh_enable();
 
     return 0;
 }