net/mac80211/iface.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Interface handling
   4  *
   5  * Copyright 2002-2005, Instant802 Networks, Inc.
   6  * Copyright 2005-2006, Devicescape Software, Inc.
   7  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   8  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   9  * Copyright 2013-2014  Intel Mobile Communications GmbH
  10  * Copyright (c) 2016        Intel Deutschland GmbH
  11  * Copyright (C) 2018-2022 Intel Corporation
  12  */
  13 #include <linux/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/if_arp.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/rtnetlink.h>
  18 #include <linux/kcov.h>
  19 #include <net/mac80211.h>
  20 #include <net/ieee80211_radiotap.h>
  21 #include "ieee80211_i.h"
  22 #include "sta_info.h"
  23 #include "debugfs_netdev.h"
  24 #include "mesh.h"
  25 #include "led.h"
  26 #include "driver-ops.h"
  27 #include "wme.h"
  28 #include "rate.h"
  29
  30 /**
  31  * DOC: Interface list locking
  32  *
  33  * The interface list in each struct ieee80211_local is protected
  34  * three-fold:
  35  *
  36  * (1) modifications may only be done under the RTNL
  37  * (2) modifications and readers are protected against each other by
  38  *     the iflist_mtx.
  39  * (3) modifications are done in an RCU manner so atomic readers
  40  *     can traverse the list in RCU-safe blocks.
  41  *
  42  * As a consequence, reads (traversals) of the list can be protected
  43  * by either the RTNL, the iflist_mtx or RCU.
  44  */
  45
  46 static void ieee80211_iface_work(struct work_struct *work);
  47
  48 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  49 {
  50         struct ieee80211_chanctx_conf *chanctx_conf;
  51         int power;
  52
  53         rcu_read_lock();
  54         chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
  55         if (!chanctx_conf) {
  56                 rcu_read_unlock();
  57                 return false;
  58         }
  59
  60         power = ieee80211_chandef_max_power(&chanctx_conf->def);
  61         rcu_read_unlock();
  62
  63         if (sdata->deflink.user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  64                 power = min(power, sdata->deflink.user_power_level);
  65
  66         if (sdata->deflink.ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  67                 power = min(power, sdata->deflink.ap_power_level);
  68
  69         if (power != sdata->vif.bss_conf.txpower) {
  70                 sdata->vif.bss_conf.txpower = power;
  71                 ieee80211_hw_config(sdata->local, 0);
  72                 return true;
  73         }
  74
  75         return false;
  76 }
  77
  78 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
  79                               bool update_bss)
  80 {
  81         if (__ieee80211_recalc_txpower(sdata) ||
  82             (update_bss && ieee80211_sdata_running(sdata)))
  83                 ieee80211_link_info_change_notify(sdata, &sdata->deflink,
  84                                                   BSS_CHANGED_TXPOWER);
  85 }
  86
  87 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
  88 {
  89         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  90                 return 0;
  91
  92         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  93         return IEEE80211_CONF_CHANGE_IDLE;
  94 }
  95
  96 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  97 {
  98         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  99                 return 0;
 100
 101         ieee80211_flush_queues(local, NULL, false);
 102
 103         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 104         return IEEE80211_CONF_CHANGE_IDLE;
 105 }
 106
 107 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
 108                                    bool force_active)
 109 {
 110         bool working, scanning, active;
 111         unsigned int led_trig_start = 0, led_trig_stop = 0;
 112
 113         lockdep_assert_held(&local->mtx);
 114
 115         active = force_active ||
 116                  !list_empty(&local->chanctx_list) ||
 117                  local->monitors;
 118
 119         working = !local->ops->remain_on_channel &&
 120                   !list_empty(&local->roc_list);
 121
 122         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 123                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 124
 125         if (working || scanning)
 126                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 127         else
 128                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 129
 130         if (active)
 131                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 132         else
 133                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 134
 135         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 136
 137         if (working || scanning || active)
 138                 return __ieee80211_idle_off(local);
 139         return __ieee80211_idle_on(local);
 140 }
 141
 142 u32 ieee80211_idle_off(struct ieee80211_local *local)
 143 {
 144         return __ieee80211_recalc_idle(local, true);
 145 }
 146
 147 void ieee80211_recalc_idle(struct ieee80211_local *local)
 148 {
 149         u32 change = __ieee80211_recalc_idle(local, false);
 150         if (change)
 151                 ieee80211_hw_config(local, change);
 152 }
 153
 154 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 155                                 bool check_dup)
 156 {
 157         struct ieee80211_local *local = sdata->local;
 158         struct ieee80211_sub_if_data *iter;
 159         u64 new, mask, tmp;
 160         u8 *m;
 161         int ret = 0;
 162
 163         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 164                 return 0;
 165
 166         m = addr;
 167         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 168                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 169                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 170
 171         m = local->hw.wiphy->addr_mask;
 172         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 173                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 174                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 175
 176         if (!check_dup)
 177                 return ret;
 178
 179         mutex_lock(&local->iflist_mtx);
 180         list_for_each_entry(iter, &local->interfaces, list) {
 181                 if (iter == sdata)
 182                         continue;
 183
 184                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 185                     !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 186                         continue;
 187
 188                 m = iter->vif.addr;
 189                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 190                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 191                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 192
 193                 if ((new & ~mask) != (tmp & ~mask)) {
 194                         ret = -EINVAL;
 195                         break;
 196                 }
 197         }
 198         mutex_unlock(&local->iflist_mtx);
 199
 200         return ret;
 201 }
 202
 203 static int ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data *sdata)
 204 {
 205         struct ieee80211_roc_work *roc;
 206         struct ieee80211_local *local = sdata->local;
 207         struct ieee80211_sub_if_data *scan_sdata;
 208         int ret = 0;
 209
 210         /* To be the most flexible here we want to only limit changing the
 211          * address if the specific interface is doing offchannel work or
 212          * scanning.
 213          */
 214         if (netif_carrier_ok(sdata->dev))
 215                 return -EBUSY;
 216
 217         mutex_lock(&local->mtx);
 218
 219         /* First check no ROC work is happening on this iface */
 220         list_for_each_entry(roc, &local->roc_list, list) {
 221                 if (roc->sdata != sdata)
 222                         continue;
 223
 224                 if (roc->started) {
 225                         ret = -EBUSY;
 226                         goto unlock;
 227                 }
 228         }
 229
 230         /* And if this iface is scanning */
 231         if (local->scanning) {
 232                 scan_sdata = rcu_dereference_protected(local->scan_sdata,
 233                                                        lockdep_is_held(&local->mtx));
 234                 if (sdata == scan_sdata)
 235                         ret = -EBUSY;
 236         }
 237
 238         switch (sdata->vif.type) {
 239         case NL80211_IFTYPE_STATION:
 240         case NL80211_IFTYPE_P2P_CLIENT:
 241                 /* More interface types could be added here but changing the
 242                  * address while powered makes the most sense in client modes.
 243                  */
 244                 break;
 245         default:
 246                 ret = -EOPNOTSUPP;
 247         }
 248
 249 unlock:
 250         mutex_unlock(&local->mtx);
 251         return ret;
 252 }
 253
 254 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 255 {
 256         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 257         struct ieee80211_local *local = sdata->local;
 258         struct sockaddr *sa = addr;
 259         bool check_dup = true;
 260         bool live = false;
 261         int ret;
 262
 263         if (ieee80211_sdata_running(sdata)) {
 264                 ret = ieee80211_can_powered_addr_change(sdata);
 265                 if (ret)
 266                         return ret;
 267
 268                 live = true;
 269         }
 270
 271         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 272             !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 273                 check_dup = false;
 274
 275         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 276         if (ret)
 277                 return ret;
 278
 279         if (live)
 280                 drv_remove_interface(local, sdata);
 281         ret = eth_mac_addr(dev, sa);
 282
 283         if (ret == 0) {
 284                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 285                 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
 286         }
 287
 288         /* Regardless of eth_mac_addr() return we still want to add the
 289          * interface back. This should not fail...
 290          */
 291         if (live)
 292                 WARN_ON(drv_add_interface(local, sdata));
 293
 294         return ret;
 295 }
 296
 297 static inline int identical_mac_addr_allowed(int type1, int type2)
 298 {
 299         return type1 == NL80211_IFTYPE_MONITOR ||
 300                 type2 == NL80211_IFTYPE_MONITOR ||
 301                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 302                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 303                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 304                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 305                         (type2 == NL80211_IFTYPE_AP ||
 306                          type2 == NL80211_IFTYPE_AP_VLAN));
 307 }
 308
 309 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 310                                             enum nl80211_iftype iftype)
 311 {
 312         struct ieee80211_local *local = sdata->local;
 313         struct ieee80211_sub_if_data *nsdata;
 314         int ret;
 315
 316         ASSERT_RTNL();
 317
 318         /* we hold the RTNL here so can safely walk the list */
 319         list_for_each_entry(nsdata, &local->interfaces, list) {
 320                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 321                         /*
 322                          * Only OCB and monitor mode may coexist
 323                          */
 324                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
 325                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
 326                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 327                              nsdata->vif.type == NL80211_IFTYPE_OCB))
 328                                 return -EBUSY;
 329
 330                         /*
 331                          * Allow only a single IBSS interface to be up at any
 332                          * time. This is restricted because beacon distribution
 333                          * cannot work properly if both are in the same IBSS.
 334                          *
 335                          * To remove this restriction we'd have to disallow them
 336                          * from setting the same SSID on different IBSS interfaces
 337                          * belonging to the same hardware. Then, however, we're
 338                          * faced with having to adopt two different TSF timers...
 339                          */
 340                         if (iftype == NL80211_IFTYPE_ADHOC &&
 341                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 342                                 return -EBUSY;
 343                         /*
 344                          * will not add another interface while any channel
 345                          * switch is active.
 346                          */
 347                         if (nsdata->vif.bss_conf.csa_active)
 348                                 return -EBUSY;
 349
 350                         /*
 351                          * The remaining checks are only performed for interfaces
 352                          * with the same MAC address.
 353                          */
 354                         if (!ether_addr_equal(sdata->vif.addr,
 355                                               nsdata->vif.addr))
 356                                 continue;
 357
 358                         /*
 359                          * check whether it may have the same address
 360                          */
 361                         if (!identical_mac_addr_allowed(iftype,
 362                                                         nsdata->vif.type))
 363                                 return -ENOTUNIQ;
 364
 365                         /* No support for VLAN with MLO yet */
 366                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 367                             nsdata->wdev.use_4addr)
 368                                 return -EOPNOTSUPP;
 369
 370                         /*
 371                          * can only add VLANs to enabled APs
 372                          */
 373                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 374                             nsdata->vif.type == NL80211_IFTYPE_AP)
 375                                 sdata->bss = &nsdata->u.ap;
 376                 }
 377         }
 378
 379         mutex_lock(&local->chanctx_mtx);
 380         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
 381         mutex_unlock(&local->chanctx_mtx);
 382         return ret;
 383 }
 384
 385 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 386                                   enum nl80211_iftype iftype)
 387 {
 388         int n_queues = sdata->local->hw.queues;
 389         int i;
 390
 391         if (iftype == NL80211_IFTYPE_NAN)
 392                 return 0;
 393
 394         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 395                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 396                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 397                                          IEEE80211_INVAL_HW_QUEUE))
 398                                 return -EINVAL;
 399                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 400                                          n_queues))
 401                                 return -EINVAL;
 402                 }
 403         }
 404
 405         if ((iftype != NL80211_IFTYPE_AP &&
 406              iftype != NL80211_IFTYPE_P2P_GO &&
 407              iftype != NL80211_IFTYPE_MESH_POINT) ||
 408             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
 409                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 410                 return 0;
 411         }
 412
 413         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 414                 return -EINVAL;
 415
 416         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 417                 return -EINVAL;
 418
 419         return 0;
 420 }
 421
 422 static int ieee80211_open(struct net_device *dev)
 423 {
 424         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 425         int err;
 426
 427         /* fail early if user set an invalid address */
 428         if (!is_valid_ether_addr(dev->dev_addr))
 429                 return -EADDRNOTAVAIL;
 430
 431         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 432         if (err)
 433                 return err;
 434
 435         wiphy_lock(sdata->local->hw.wiphy);
 436         err = ieee80211_do_open(&sdata->wdev, true);
 437         wiphy_unlock(sdata->local->hw.wiphy);
 438
 439         return err;
 440 }
 441
 442 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down)
 443 {
 444         struct ieee80211_local *local = sdata->local;
 445         unsigned long flags;
 446         struct sk_buff *skb, *tmp;
 447         u32 hw_reconf_flags = 0;
 448         int i, flushed;
 449         struct ps_data *ps;
 450         struct cfg80211_chan_def chandef;
 451         bool cancel_scan;
 452         struct cfg80211_nan_func *func;
 453
 454         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 455         synchronize_rcu(); /* flush _ieee80211_wake_txqs() */
 456
 457         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 458         if (cancel_scan)
 459                 ieee80211_scan_cancel(local);
 460
 461         /*
 462          * Stop TX on this interface first.
 463          */
 464         if (!local->ops->wake_tx_queue && sdata->dev)
 465                 netif_tx_stop_all_queues(sdata->dev);
 466
 467         ieee80211_roc_purge(local, sdata);
 468
 469         switch (sdata->vif.type) {
 470         case NL80211_IFTYPE_STATION:
 471                 ieee80211_mgd_stop(sdata);
 472                 break;
 473         case NL80211_IFTYPE_ADHOC:
 474                 ieee80211_ibss_stop(sdata);
 475                 break;
 476         case NL80211_IFTYPE_MONITOR:
 477                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
 478                         break;
 479                 list_del_rcu(&sdata->u.mntr.list);
 480                 break;
 481         default:
 482                 break;
 483         }
 484
 485         /*
 486          * Remove all stations associated with this interface.
 487          *
 488          * This must be done before calling ops->remove_interface()
 489          * because otherwise we can later invoke ops->sta_notify()
 490          * whenever the STAs are removed, and that invalidates driver
 491          * assumptions about always getting a vif pointer that is valid
 492          * (because if we remove a STA after ops->remove_interface()
 493          * the driver will have removed the vif info already!)
 494          *
 495          * For AP_VLANs stations may exist since there's nothing else that
 496          * would have removed them, but in other modes there shouldn't
 497          * be any stations.
 498          */
 499         flushed = sta_info_flush(sdata);
 500         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0);
 501
 502         /* don't count this interface for allmulti while it is down */
 503         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 504                 atomic_dec(&local->iff_allmultis);
 505
 506         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 507                 local->fif_pspoll--;
 508                 local->fif_probe_req--;
 509         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 510                 local->fif_probe_req--;
 511         }
 512
 513         if (sdata->dev) {
 514                 netif_addr_lock_bh(sdata->dev);
 515                 spin_lock_bh(&local->filter_lock);
 516                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 517                                  sdata->dev->addr_len);
 518                 spin_unlock_bh(&local->filter_lock);
 519                 netif_addr_unlock_bh(sdata->dev);
 520         }
 521
 522         del_timer_sync(&local->dynamic_ps_timer);
 523         cancel_work_sync(&local->dynamic_ps_enable_work);
 524
 525         cancel_work_sync(&sdata->recalc_smps);
 526
 527         sdata_lock(sdata);
 528         WARN(sdata->vif.valid_links,
 529              "destroying interface with valid links 0x%04x\n",
 530              sdata->vif.valid_links);
 531
 532         mutex_lock(&local->mtx);
 533         sdata->vif.bss_conf.csa_active = false;
 534         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 535                 sdata->deflink.u.mgd.csa_waiting_bcn = false;
 536         if (sdata->deflink.csa_block_tx) {
 537                 ieee80211_wake_vif_queues(local, sdata,
 538                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 539                 sdata->deflink.csa_block_tx = false;
 540         }
 541         mutex_unlock(&local->mtx);
 542         sdata_unlock(sdata);
 543
 544         cancel_work_sync(&sdata->deflink.csa_finalize_work);
 545         cancel_work_sync(&sdata->deflink.color_change_finalize_work);
 546
 547         cancel_delayed_work_sync(&sdata->deflink.dfs_cac_timer_work);
 548
 549         if (sdata->wdev.cac_started) {
 550                 chandef = sdata->vif.bss_conf.chandef;
 551                 WARN_ON(local->suspended);
 552                 mutex_lock(&local->mtx);
 553                 ieee80211_link_release_channel(&sdata->deflink);
 554                 mutex_unlock(&local->mtx);
 555                 cfg80211_cac_event(sdata->dev, &chandef,
 556                                    NL80211_RADAR_CAC_ABORTED,
 557                                    GFP_KERNEL);
 558         }
 559
 560         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 561                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 562         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 563                 /* remove all packets in parent bc_buf pointing to this dev */
 564                 ps = &sdata->bss->ps;
 565
 566                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 567                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 568                         if (skb->dev == sdata->dev) {
 569                                 __skb_unlink(skb, &ps->bc_buf);
 570                                 local->total_ps_buffered--;
 571                                 ieee80211_free_txskb(&local->hw, skb);
 572                         }
 573                 }
 574                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 575         }
 576
 577         if (going_down)
 578                 local->open_count--;
 579
 580         switch (sdata->vif.type) {
 581         case NL80211_IFTYPE_AP_VLAN:
 582                 mutex_lock(&local->mtx);
 583                 list_del(&sdata->u.vlan.list);
 584                 mutex_unlock(&local->mtx);
 585                 RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL);
 586                 /* see comment in the default case below */
 587                 ieee80211_free_keys(sdata, true);
 588                 /* no need to tell driver */
 589                 break;
 590         case NL80211_IFTYPE_MONITOR:
 591                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 592                         local->cooked_mntrs--;
 593                         break;
 594                 }
 595
 596                 local->monitors--;
 597                 if (local->monitors == 0) {
 598                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 599                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 600                 }
 601
 602                 ieee80211_adjust_monitor_flags(sdata, -1);
 603                 break;
 604         case NL80211_IFTYPE_NAN:
 605                 /* clean all the functions */
 606                 spin_lock_bh(&sdata->u.nan.func_lock);
 607
 608                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
 609                         idr_remove(&sdata->u.nan.function_inst_ids, i);
 610                         cfg80211_free_nan_func(func);
 611                 }
 612                 idr_destroy(&sdata->u.nan.function_inst_ids);
 613
 614                 spin_unlock_bh(&sdata->u.nan.func_lock);
 615                 break;
 616         case NL80211_IFTYPE_P2P_DEVICE:
 617                 /* relies on synchronize_rcu() below */
 618                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 619                 fallthrough;
 620         default:
 621                 cancel_work_sync(&sdata->work);
 622                 /*
 623                  * When we get here, the interface is marked down.
 624                  * Free the remaining keys, if there are any
 625                  * (which can happen in AP mode if userspace sets
 626                  * keys before the interface is operating)
 627                  *
 628                  * Force the key freeing to always synchronize_net()
 629                  * to wait for the RX path in case it is using this
 630                  * interface enqueuing frames at this very time on
 631                  * another CPU.
 632                  */
 633                 ieee80211_free_keys(sdata, true);
 634                 skb_queue_purge(&sdata->skb_queue);
 635                 skb_queue_purge(&sdata->status_queue);
 636         }
 637
 638         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 639         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 640                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 641                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 642                         if (info->control.vif == &sdata->vif) {
 643                                 __skb_unlink(skb, &local->pending[i]);
 644                                 ieee80211_free_txskb(&local->hw, skb);
 645                         }
 646                 }
 647         }
 648         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 649
 650         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 651                 ieee80211_txq_remove_vlan(local, sdata);
 652
 653         sdata->bss = NULL;
 654
 655         if (local->open_count == 0)
 656                 ieee80211_clear_tx_pending(local);
 657
 658         sdata->vif.bss_conf.beacon_int = 0;
 659
 660         /*
 661          * If the interface goes down while suspended, presumably because
 662          * the device was unplugged and that happens before our resume,
 663          * then the driver is already unconfigured and the remainder of
 664          * this function isn't needed.
 665          * XXX: what about WoWLAN? If the device has software state, e.g.
 666          *      memory allocated, it might expect teardown commands from
 667          *      mac80211 here?
 668          */
 669         if (local->suspended) {
 670                 WARN_ON(local->wowlan);
 671                 WARN_ON(rcu_access_pointer(local->monitor_sdata));
 672                 return;
 673         }
 674
 675         switch (sdata->vif.type) {
 676         case NL80211_IFTYPE_AP_VLAN:
 677                 break;
 678         case NL80211_IFTYPE_MONITOR:
 679                 if (local->monitors == 0)
 680                         ieee80211_del_virtual_monitor(local);
 681
 682                 mutex_lock(&local->mtx);
 683                 ieee80211_recalc_idle(local);
 684                 mutex_unlock(&local->mtx);
 685
 686                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 687                         break;
 688
 689                 fallthrough;
 690         default:
 691                 if (going_down)
 692                         drv_remove_interface(local, sdata);
 693         }
 694
 695         ieee80211_recalc_ps(local);
 696
 697         if (cancel_scan)
 698                 flush_delayed_work(&local->scan_work);
 699
 700         if (local->open_count == 0) {
 701                 ieee80211_stop_device(local);
 702
 703                 /* no reconfiguring after stop! */
 704                 return;
 705         }
 706
 707         /* do after stop to avoid reconfiguring when we stop anyway */
 708         ieee80211_configure_filter(local);
 709         ieee80211_hw_config(local, hw_reconf_flags);
 710
 711         if (local->monitors == local->open_count)
 712                 ieee80211_add_virtual_monitor(local);
 713 }
 714
 715 static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata)
 716 {
 717         struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata;
 718         struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif;
 719
 720         if (!tx_vif)
 721                 return;
 722
 723         tx_sdata = vif_to_sdata(tx_vif);
 724         sdata->vif.mbssid_tx_vif = NULL;
 725
 726         list_for_each_entry_safe(non_tx_sdata, tmp_sdata,
 727                                  &tx_sdata->local->interfaces, list) {
 728                 if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata &&
 729                     non_tx_sdata->vif.mbssid_tx_vif == tx_vif &&
 730                     ieee80211_sdata_running(non_tx_sdata)) {
 731                         non_tx_sdata->vif.mbssid_tx_vif = NULL;
 732                         dev_close(non_tx_sdata->wdev.netdev);
 733                 }
 734         }
 735
 736         if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) {
 737                 tx_sdata->vif.mbssid_tx_vif = NULL;
 738                 dev_close(tx_sdata->wdev.netdev);
 739         }
 740 }
 741
 742 static int ieee80211_stop(struct net_device *dev)
 743 {
 744         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 745
 746         /* close dependent VLAN and MBSSID interfaces before locking wiphy */
 747         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 748                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 749
 750                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 751                                          u.vlan.list)
 752                         dev_close(vlan->dev);
 753
 754                 ieee80211_stop_mbssid(sdata);
 755         }
 756
 757         cancel_work_sync(&sdata->activate_links_work);
 758
 759         wiphy_lock(sdata->local->hw.wiphy);
 760         ieee80211_do_stop(sdata, true);
 761         wiphy_unlock(sdata->local->hw.wiphy);
 762
 763         return 0;
 764 }
 765
 766 static void ieee80211_set_multicast_list(struct net_device *dev)
 767 {
 768         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 769         struct ieee80211_local *local = sdata->local;
 770         int allmulti, sdata_allmulti;
 771
 772         allmulti = !!(dev->flags & IFF_ALLMULTI);
 773         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 774
 775         if (allmulti != sdata_allmulti) {
 776                 if (dev->flags & IFF_ALLMULTI)
 777                         atomic_inc(&local->iff_allmultis);
 778                 else
 779                         atomic_dec(&local->iff_allmultis);
 780                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 781         }
 782
 783         spin_lock_bh(&local->filter_lock);
 784         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 785         spin_unlock_bh(&local->filter_lock);
 786         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 787 }
 788
 789 /*
 790  * Called when the netdev is removed or, by the code below, before
 791  * the interface type changes.
 792  */
 793 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 794 {
 795         /* free extra data */
 796         ieee80211_free_keys(sdata, false);
 797
 798         ieee80211_debugfs_remove_netdev(sdata);
 799
 800         ieee80211_destroy_frag_cache(&sdata->frags);
 801
 802         if (ieee80211_vif_is_mesh(&sdata->vif))
 803                 ieee80211_mesh_teardown_sdata(sdata);
 804
 805         ieee80211_vif_clear_links(sdata);
 806         ieee80211_link_stop(&sdata->deflink);
 807 }
 808
 809 static void ieee80211_uninit(struct net_device *dev)
 810 {
 811         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
 812 }
 813
 814 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 815                                          struct sk_buff *skb,
 816                                          struct net_device *sb_dev)
 817 {
 818         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 819 }
 820
 821 static void
 822 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 823 {
 824         dev_fetch_sw_netstats(stats, dev->tstats);
 825 }
 826
 827 static const struct net_device_ops ieee80211_dataif_ops = {
 828         .ndo_open               = ieee80211_open,
 829         .ndo_stop               = ieee80211_stop,
 830         .ndo_uninit             = ieee80211_uninit,
 831         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 832         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 833         .ndo_set_mac_address    = ieee80211_change_mac,
 834         .ndo_select_queue       = ieee80211_netdev_select_queue,
 835         .ndo_get_stats64        = ieee80211_get_stats64,
 836 };
 837
 838 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 839                                           struct sk_buff *skb,
 840                                           struct net_device *sb_dev)
 841 {
 842         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 843         struct ieee80211_local *local = sdata->local;
 844         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 845         struct ieee80211_hdr *hdr;
 846         int len_rthdr;
 847
 848         if (local->hw.queues < IEEE80211_NUM_ACS)
 849                 return 0;
 850
 851         /* reset flags and info before parsing radiotap header */
 852         memset(info, 0, sizeof(*info));
 853
 854         if (!ieee80211_parse_tx_radiotap(skb, dev))
 855                 return 0; /* doesn't matter, frame will be dropped */
 856
 857         len_rthdr = ieee80211_get_radiotap_len(skb->data);
 858         hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
 859         if (skb->len < len_rthdr + 2 ||
 860             skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
 861                 return 0; /* doesn't matter, frame will be dropped */
 862
 863         return ieee80211_select_queue_80211(sdata, skb, hdr);
 864 }
 865
 866 static const struct net_device_ops ieee80211_monitorif_ops = {
 867         .ndo_open               = ieee80211_open,
 868         .ndo_stop               = ieee80211_stop,
 869         .ndo_uninit             = ieee80211_uninit,
 870         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 871         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 872         .ndo_set_mac_address    = ieee80211_change_mac,
 873         .ndo_select_queue       = ieee80211_monitor_select_queue,
 874         .ndo_get_stats64        = ieee80211_get_stats64,
 875 };
 876
 877 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx,
 878                                               struct net_device_path *path)
 879 {
 880         struct ieee80211_sub_if_data *sdata;
 881         struct ieee80211_local *local;
 882         struct sta_info *sta;
 883         int ret = -ENOENT;
 884
 885         sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev);
 886         local = sdata->local;
 887
 888         if (!local->ops->net_fill_forward_path)
 889                 return -EOPNOTSUPP;
 890
 891         rcu_read_lock();
 892         switch (sdata->vif.type) {
 893         case NL80211_IFTYPE_AP_VLAN:
 894                 sta = rcu_dereference(sdata->u.vlan.sta);
 895                 if (sta)
 896                         break;
 897                 if (sdata->wdev.use_4addr)
 898                         goto out;
 899                 if (is_multicast_ether_addr(ctx->daddr))
 900                         goto out;
 901                 sta = sta_info_get_bss(sdata, ctx->daddr);
 902                 break;
 903         case NL80211_IFTYPE_AP:
 904                 if (is_multicast_ether_addr(ctx->daddr))
 905                         goto out;
 906                 sta = sta_info_get(sdata, ctx->daddr);
 907                 break;
 908         case NL80211_IFTYPE_STATION:
 909                 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
 910                         sta = sta_info_get(sdata, ctx->daddr);
 911                         if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
 912                                 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
 913                                         goto out;
 914
 915                                 break;
 916                         }
 917                 }
 918
 919                 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid);
 920                 break;
 921         default:
 922                 goto out;
 923         }
 924
 925         if (!sta)
 926                 goto out;
 927
 928         ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path);
 929 out:
 930         rcu_read_unlock();
 931
 932         return ret;
 933 }
 934
 935 static const struct net_device_ops ieee80211_dataif_8023_ops = {
 936         .ndo_open               = ieee80211_open,
 937         .ndo_stop               = ieee80211_stop,
 938         .ndo_uninit             = ieee80211_uninit,
 939         .ndo_start_xmit         = ieee80211_subif_start_xmit_8023,
 940         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 941         .ndo_set_mac_address    = ieee80211_change_mac,
 942         .ndo_select_queue       = ieee80211_netdev_select_queue,
 943         .ndo_get_stats64        = ieee80211_get_stats64,
 944         .ndo_fill_forward_path  = ieee80211_netdev_fill_forward_path,
 945 };
 946
 947 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)
 948 {
 949         switch (iftype) {
 950         /* P2P GO and client are mapped to AP/STATION types */
 951         case NL80211_IFTYPE_AP:
 952         case NL80211_IFTYPE_STATION:
 953                 return true;
 954         default:
 955                 return false;
 956         }
 957 }
 958
 959 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
 960 {
 961         struct ieee80211_local *local = sdata->local;
 962         u32 flags;
 963
 964         flags = sdata->vif.offload_flags;
 965
 966         if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
 967             ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
 968                 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
 969
 970                 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
 971                     local->hw.wiphy->frag_threshold != (u32)-1)
 972                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 973
 974                 if (local->monitors)
 975                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 976         } else {
 977                 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 978         }
 979
 980         if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) &&
 981             ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
 982                 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED;
 983
 984                 if (local->monitors &&
 985                     !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP))
 986                         flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
 987         } else {
 988                 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
 989         }
 990
 991         if (sdata->vif.offload_flags == flags)
 992                 return false;
 993
 994         sdata->vif.offload_flags = flags;
 995         ieee80211_check_fast_rx_iface(sdata);
 996         return true;
 997 }
 998
 999 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
1000 {
1001         struct ieee80211_local *local = sdata->local;
1002         struct ieee80211_sub_if_data *bss = sdata;
1003         bool enabled;
1004
1005         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1006                 if (!sdata->bss)
1007                         return;
1008
1009                 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1010         }
1011
1012         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
1013             !ieee80211_iftype_supports_hdr_offload(bss->vif.type))
1014                 return;
1015
1016         enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
1017         if (sdata->wdev.use_4addr &&
1018             !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
1019                 enabled = false;
1020
1021         sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
1022                                            &ieee80211_dataif_ops;
1023 }
1024
1025 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
1026 {
1027         struct ieee80211_local *local = sdata->local;
1028         struct ieee80211_sub_if_data *vsdata;
1029
1030         if (ieee80211_set_sdata_offload_flags(sdata)) {
1031                 drv_update_vif_offload(local, sdata);
1032                 ieee80211_set_vif_encap_ops(sdata);
1033         }
1034
1035         list_for_each_entry(vsdata, &local->interfaces, list) {
1036                 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
1037                     vsdata->bss != &sdata->u.ap)
1038                         continue;
1039
1040                 ieee80211_set_vif_encap_ops(vsdata);
1041         }
1042 }
1043
1044 void ieee80211_recalc_offload(struct ieee80211_local *local)
1045 {
1046         struct ieee80211_sub_if_data *sdata;
1047
1048         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
1049                 return;
1050
1051         mutex_lock(&local->iflist_mtx);
1052
1053         list_for_each_entry(sdata, &local->interfaces, list) {
1054                 if (!ieee80211_sdata_running(sdata))
1055                         continue;
1056
1057                 ieee80211_recalc_sdata_offload(sdata);
1058         }
1059
1060         mutex_unlock(&local->iflist_mtx);
1061 }
1062
1063 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
1064                                     const int offset)
1065 {
1066         struct ieee80211_local *local = sdata->local;
1067         u32 flags = sdata->u.mntr.flags;
1068
1069 #define ADJUST(_f, _s)  do {                                    \
1070         if (flags & MONITOR_FLAG_##_f)                          \
1071                 local->fif_##_s += offset;                      \
1072         } while (0)
1073
1074         ADJUST(FCSFAIL, fcsfail);
1075         ADJUST(PLCPFAIL, plcpfail);
1076         ADJUST(CONTROL, control);
1077         ADJUST(CONTROL, pspoll);
1078         ADJUST(OTHER_BSS, other_bss);
1079
1080 #undef ADJUST
1081 }
1082
1083 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
1084 {
1085         struct ieee80211_local *local = sdata->local;
1086         int i;
1087
1088         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
1089                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1090                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
1091                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
1092                         sdata->vif.hw_queue[i] = i;
1093                 else
1094                         sdata->vif.hw_queue[i] = 0;
1095         }
1096         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
1097 }
1098
1099 static void ieee80211_sdata_init(struct ieee80211_local *local,
1100                                  struct ieee80211_sub_if_data *sdata)
1101 {
1102         sdata->local = local;
1103
1104         /*
1105          * Initialize the default link, so we can use link_id 0 for non-MLD,
1106          * and that continues to work for non-MLD-aware drivers that use just
1107          * vif.bss_conf instead of vif.link_conf.
1108          *
1109          * Note that we never change this, so if link ID 0 isn't used in an
1110          * MLD connection, we get a separate allocation for it.
1111          */
1112         ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf);
1113 }
1114
1115 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
1116 {
1117         struct ieee80211_sub_if_data *sdata;
1118         int ret;
1119
1120         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1121                 return 0;
1122
1123         ASSERT_RTNL();
1124         lockdep_assert_wiphy(local->hw.wiphy);
1125
1126         if (local->monitor_sdata)
1127                 return 0;
1128
1129         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
1130         if (!sdata)
1131                 return -ENOMEM;
1132
1133         /* set up data */
1134         sdata->vif.type = NL80211_IFTYPE_MONITOR;
1135         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
1136                  wiphy_name(local->hw.wiphy));
1137         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
1138
1139         ieee80211_sdata_init(local, sdata);
1140
1141         ieee80211_set_default_queues(sdata);
1142
1143         ret = drv_add_interface(local, sdata);
1144         if (WARN_ON(ret)) {
1145                 /* ok .. stupid driver, it asked for this! */
1146                 kfree(sdata);
1147                 return ret;
1148         }
1149
1150         set_bit(SDATA_STATE_RUNNING, &sdata->state);
1151
1152         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
1153         if (ret) {
1154                 kfree(sdata);
1155                 return ret;
1156         }
1157
1158         mutex_lock(&local->iflist_mtx);
1159         rcu_assign_pointer(local->monitor_sdata, sdata);
1160         mutex_unlock(&local->iflist_mtx);
1161
1162         mutex_lock(&local->mtx);
1163         ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chandef,
1164                                          IEEE80211_CHANCTX_EXCLUSIVE);
1165         mutex_unlock(&local->mtx);
1166         if (ret) {
1167                 mutex_lock(&local->iflist_mtx);
1168                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
1169                 mutex_unlock(&local->iflist_mtx);
1170                 synchronize_net();
1171                 drv_remove_interface(local, sdata);
1172                 kfree(sdata);
1173                 return ret;
1174         }
1175
1176         skb_queue_head_init(&sdata->skb_queue);
1177         skb_queue_head_init(&sdata->status_queue);
1178         INIT_WORK(&sdata->work, ieee80211_iface_work);
1179
1180         return 0;
1181 }
1182
1183 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
1184 {
1185         struct ieee80211_sub_if_data *sdata;
1186
1187         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1188                 return;
1189
1190         ASSERT_RTNL();
1191         lockdep_assert_wiphy(local->hw.wiphy);
1192
1193         mutex_lock(&local->iflist_mtx);
1194
1195         sdata = rcu_dereference_protected(local->monitor_sdata,
1196                                           lockdep_is_held(&local->iflist_mtx));
1197         if (!sdata) {
1198                 mutex_unlock(&local->iflist_mtx);
1199                 return;
1200         }
1201
1202         RCU_INIT_POINTER(local->monitor_sdata, NULL);
1203         mutex_unlock(&local->iflist_mtx);
1204
1205         synchronize_net();
1206
1207         mutex_lock(&local->mtx);
1208         ieee80211_link_release_channel(&sdata->deflink);
1209         mutex_unlock(&local->mtx);
1210
1211         drv_remove_interface(local, sdata);
1212
1213         kfree(sdata);
1214 }
1215
1216 /*
1217  * NOTE: Be very careful when changing this function, it must NOT return
1218  * an error on interface type changes that have been pre-checked, so most
1219  * checks should be in ieee80211_check_concurrent_iface.
1220  */
1221 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1222 {
1223         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1224         struct net_device *dev = wdev->netdev;
1225         struct ieee80211_local *local = sdata->local;
1226         u32 changed = 0;
1227         int res;
1228         u32 hw_reconf_flags = 0;
1229
1230         switch (sdata->vif.type) {
1231         case NL80211_IFTYPE_AP_VLAN: {
1232                 struct ieee80211_sub_if_data *master;
1233
1234                 if (!sdata->bss)
1235                         return -ENOLINK;
1236
1237                 mutex_lock(&local->mtx);
1238                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1239                 mutex_unlock(&local->mtx);
1240
1241                 master = container_of(sdata->bss,
1242                                       struct ieee80211_sub_if_data, u.ap);
1243                 sdata->control_port_protocol =
1244                         master->control_port_protocol;
1245                 sdata->control_port_no_encrypt =
1246                         master->control_port_no_encrypt;
1247                 sdata->control_port_over_nl80211 =
1248                         master->control_port_over_nl80211;
1249                 sdata->control_port_no_preauth =
1250                         master->control_port_no_preauth;
1251                 sdata->vif.cab_queue = master->vif.cab_queue;
1252                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1253                        sizeof(sdata->vif.hw_queue));
1254                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1255
1256                 mutex_lock(&local->key_mtx);
1257                 sdata->crypto_tx_tailroom_needed_cnt +=
1258                         master->crypto_tx_tailroom_needed_cnt;
1259                 mutex_unlock(&local->key_mtx);
1260
1261                 break;
1262                 }
1263         case NL80211_IFTYPE_AP:
1264                 sdata->bss = &sdata->u.ap;
1265                 break;
1266         case NL80211_IFTYPE_MESH_POINT:
1267         case NL80211_IFTYPE_STATION:
1268         case NL80211_IFTYPE_MONITOR:
1269         case NL80211_IFTYPE_ADHOC:
1270         case NL80211_IFTYPE_P2P_DEVICE:
1271         case NL80211_IFTYPE_OCB:
1272         case NL80211_IFTYPE_NAN:
1273                 /* no special treatment */
1274                 break;
1275         case NL80211_IFTYPE_UNSPECIFIED:
1276         case NUM_NL80211_IFTYPES:
1277         case NL80211_IFTYPE_P2P_CLIENT:
1278         case NL80211_IFTYPE_P2P_GO:
1279         case NL80211_IFTYPE_WDS:
1280                 /* cannot happen */
1281                 WARN_ON(1);
1282                 break;
1283         }
1284
1285         if (local->open_count == 0) {
1286                 res = drv_start(local);
1287                 if (res)
1288                         goto err_del_bss;
1289                 /* we're brought up, everything changes */
1290                 hw_reconf_flags = ~0;
1291                 ieee80211_led_radio(local, true);
1292                 ieee80211_mod_tpt_led_trig(local,
1293                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1294         }
1295
1296         /*
1297          * Copy the hopefully now-present MAC address to
1298          * this interface, if it has the special null one.
1299          */
1300         if (dev && is_zero_ether_addr(dev->dev_addr)) {
1301                 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr);
1302                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1303
1304                 if (!is_valid_ether_addr(dev->dev_addr)) {
1305                         res = -EADDRNOTAVAIL;
1306                         goto err_stop;
1307                 }
1308         }
1309
1310         switch (sdata->vif.type) {
1311         case NL80211_IFTYPE_AP_VLAN:
1312                 /* no need to tell driver, but set carrier and chanctx */
1313                 if (sdata->bss->active) {
1314                         ieee80211_link_vlan_copy_chanctx(&sdata->deflink);
1315                         netif_carrier_on(dev);
1316                         ieee80211_set_vif_encap_ops(sdata);
1317                 } else {
1318                         netif_carrier_off(dev);
1319                 }
1320                 break;
1321         case NL80211_IFTYPE_MONITOR:
1322                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1323                         local->cooked_mntrs++;
1324                         break;
1325                 }
1326
1327                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1328                         res = drv_add_interface(local, sdata);
1329                         if (res)
1330                                 goto err_stop;
1331                 } else if (local->monitors == 0 && local->open_count == 0) {
1332                         res = ieee80211_add_virtual_monitor(local);
1333                         if (res)
1334                                 goto err_stop;
1335                 }
1336
1337                 /* must be before the call to ieee80211_configure_filter */
1338                 local->monitors++;
1339                 if (local->monitors == 1) {
1340                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1341                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1342                 }
1343
1344                 ieee80211_adjust_monitor_flags(sdata, 1);
1345                 ieee80211_configure_filter(local);
1346                 ieee80211_recalc_offload(local);
1347                 mutex_lock(&local->mtx);
1348                 ieee80211_recalc_idle(local);
1349                 mutex_unlock(&local->mtx);
1350
1351                 netif_carrier_on(dev);
1352                 break;
1353         default:
1354                 if (coming_up) {
1355                         ieee80211_del_virtual_monitor(local);
1356                         ieee80211_set_sdata_offload_flags(sdata);
1357
1358                         res = drv_add_interface(local, sdata);
1359                         if (res)
1360                                 goto err_stop;
1361
1362                         ieee80211_set_vif_encap_ops(sdata);
1363                         res = ieee80211_check_queues(sdata,
1364                                 ieee80211_vif_type_p2p(&sdata->vif));
1365                         if (res)
1366                                 goto err_del_interface;
1367                 }
1368
1369                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1370                         local->fif_pspoll++;
1371                         local->fif_probe_req++;
1372
1373                         ieee80211_configure_filter(local);
1374                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1375                         local->fif_probe_req++;
1376                 }
1377
1378                 if (sdata->vif.probe_req_reg)
1379                         drv_config_iface_filter(local, sdata,
1380                                                 FIF_PROBE_REQ,
1381                                                 FIF_PROBE_REQ);
1382
1383                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1384                     sdata->vif.type != NL80211_IFTYPE_NAN)
1385                         changed |= ieee80211_reset_erp_info(sdata);
1386                 ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1387                                                   changed);
1388
1389                 switch (sdata->vif.type) {
1390                 case NL80211_IFTYPE_STATION:
1391                 case NL80211_IFTYPE_ADHOC:
1392                 case NL80211_IFTYPE_AP:
1393                 case NL80211_IFTYPE_MESH_POINT:
1394                 case NL80211_IFTYPE_OCB:
1395                         netif_carrier_off(dev);
1396                         break;
1397                 case NL80211_IFTYPE_P2P_DEVICE:
1398                 case NL80211_IFTYPE_NAN:
1399                         break;
1400                 default:
1401                         /* not reached */
1402                         WARN_ON(1);
1403                 }
1404
1405                 /*
1406                  * Set default queue parameters so drivers don't
1407                  * need to initialise the hardware if the hardware
1408                  * doesn't start up with sane defaults.
1409                  * Enable QoS for anything but station interfaces.
1410                  */
1411                 ieee80211_set_wmm_default(&sdata->deflink, true,
1412                         sdata->vif.type != NL80211_IFTYPE_STATION);
1413         }
1414
1415         switch (sdata->vif.type) {
1416         case NL80211_IFTYPE_P2P_DEVICE:
1417                 rcu_assign_pointer(local->p2p_sdata, sdata);
1418                 break;
1419         case NL80211_IFTYPE_MONITOR:
1420                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1421                         break;
1422                 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1423                 break;
1424         default:
1425                 break;
1426         }
1427
1428         /*
1429          * set_multicast_list will be invoked by the networking core
1430          * which will check whether any increments here were done in
1431          * error and sync them down to the hardware as filter flags.
1432          */
1433         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1434                 atomic_inc(&local->iff_allmultis);
1435
1436         if (coming_up)
1437                 local->open_count++;
1438
1439         if (hw_reconf_flags)
1440                 ieee80211_hw_config(local, hw_reconf_flags);
1441
1442         ieee80211_recalc_ps(local);
1443
1444         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1445             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1446             local->ops->wake_tx_queue) {
1447                 /* XXX: for AP_VLAN, actually track AP queues */
1448                 if (dev)
1449                         netif_tx_start_all_queues(dev);
1450         } else if (dev) {
1451                 unsigned long flags;
1452                 int n_acs = IEEE80211_NUM_ACS;
1453                 int ac;
1454
1455                 if (local->hw.queues < IEEE80211_NUM_ACS)
1456                         n_acs = 1;
1457
1458                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1459                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
1460                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
1461                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
1462                         for (ac = 0; ac < n_acs; ac++) {
1463                                 int ac_queue = sdata->vif.hw_queue[ac];
1464
1465                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
1466                                     skb_queue_empty(&local->pending[ac_queue]))
1467                                         netif_start_subqueue(dev, ac);
1468                         }
1469                 }
1470                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1471         }
1472
1473         set_bit(SDATA_STATE_RUNNING, &sdata->state);
1474
1475         return 0;
1476  err_del_interface:
1477         drv_remove_interface(local, sdata);
1478  err_stop:
1479         if (!local->open_count)
1480                 drv_stop(local);
1481  err_del_bss:
1482         sdata->bss = NULL;
1483         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1484                 mutex_lock(&local->mtx);
1485                 list_del(&sdata->u.vlan.list);
1486                 mutex_unlock(&local->mtx);
1487         }
1488         /* might already be clear but that doesn't matter */
1489         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1490         return res;
1491 }
1492
1493 static void ieee80211_if_free(struct net_device *dev)
1494 {
1495         free_percpu(dev->tstats);
1496 }
1497
1498 static void ieee80211_if_setup(struct net_device *dev)
1499 {
1500         ether_setup(dev);
1501         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1502         dev->netdev_ops = &ieee80211_dataif_ops;
1503         dev->needs_free_netdev = true;
1504         dev->priv_destructor = ieee80211_if_free;
1505 }
1506
1507 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1508 {
1509         ieee80211_if_setup(dev);
1510         dev->priv_flags |= IFF_NO_QUEUE;
1511 }
1512
1513 static void ieee80211_iface_process_skb(struct ieee80211_local *local,
1514                                         struct ieee80211_sub_if_data *sdata,
1515                                         struct sk_buff *skb)
1516 {
1517         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1518
1519         if (ieee80211_is_action(mgmt->frame_control) &&
1520             mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1521                 struct sta_info *sta;
1522                 int len = skb->len;
1523
1524                 mutex_lock(&local->sta_mtx);
1525                 sta = sta_info_get_bss(sdata, mgmt->sa);
1526                 if (sta) {
1527                         switch (mgmt->u.action.u.addba_req.action_code) {
1528                         case WLAN_ACTION_ADDBA_REQ:
1529                                 ieee80211_process_addba_request(local, sta,
1530                                                                 mgmt, len);
1531                                 break;
1532                         case WLAN_ACTION_ADDBA_RESP:
1533                                 ieee80211_process_addba_resp(local, sta,
1534                                                              mgmt, len);
1535                                 break;
1536                         case WLAN_ACTION_DELBA:
1537                                 ieee80211_process_delba(sdata, sta,
1538                                                         mgmt, len);
1539                                 break;
1540                         default:
1541                                 WARN_ON(1);
1542                                 break;
1543                         }
1544                 }
1545                 mutex_unlock(&local->sta_mtx);
1546         } else if (ieee80211_is_action(mgmt->frame_control) &&
1547                    mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1548                 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1549                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1550                         struct ieee80211_rx_status *status;
1551                         enum nl80211_band band;
1552                         struct sta_info *sta;
1553                         u8 opmode;
1554
1555                         status = IEEE80211_SKB_RXCB(skb);
1556                         band = status->band;
1557                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1558
1559                         mutex_lock(&local->sta_mtx);
1560                         sta = sta_info_get_bss(sdata, mgmt->sa);
1561
1562                         if (sta)
1563                                 ieee80211_vht_handle_opmode(sdata,
1564                                                             &sta->deflink,
1565                                                             opmode, band);
1566
1567                         mutex_unlock(&local->sta_mtx);
1568                         break;
1569                 }
1570                 case WLAN_VHT_ACTION_GROUPID_MGMT:
1571                         ieee80211_process_mu_groups(sdata, &sdata->deflink,
1572                                                     mgmt);
1573                         break;
1574                 default:
1575                         WARN_ON(1);
1576                         break;
1577                 }
1578         } else if (ieee80211_is_action(mgmt->frame_control) &&
1579                    mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1580                 switch (mgmt->u.action.u.s1g.action_code) {
1581                 case WLAN_S1G_TWT_TEARDOWN:
1582                 case WLAN_S1G_TWT_SETUP:
1583                         ieee80211_s1g_rx_twt_action(sdata, skb);
1584                         break;
1585                 default:
1586                         break;
1587                 }
1588         } else if (ieee80211_is_ext(mgmt->frame_control)) {
1589                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1590                         ieee80211_sta_rx_queued_ext(sdata, skb);
1591                 else
1592                         WARN_ON(1);
1593         } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1594                 struct ieee80211_hdr *hdr = (void *)mgmt;
1595                 struct sta_info *sta;
1596
1597                 /*
1598                  * So the frame isn't mgmt, but frame_control
1599                  * is at the right place anyway, of course, so
1600                  * the if statement is correct.
1601                  *
1602                  * Warn if we have other data frame types here,
1603                  * they must not get here.
1604                  */
1605                 WARN_ON(hdr->frame_control &
1606                                 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1607                 WARN_ON(!(hdr->seq_ctrl &
1608                                 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1609                 /*
1610                  * This was a fragment of a frame, received while
1611                  * a block-ack session was active. That cannot be
1612                  * right, so terminate the session.
1613                  */
1614                 mutex_lock(&local->sta_mtx);
1615                 sta = sta_info_get_bss(sdata, mgmt->sa);
1616                 if (sta) {
1617                         u16 tid = ieee80211_get_tid(hdr);
1618
1619                         __ieee80211_stop_rx_ba_session(
1620                                 sta, tid, WLAN_BACK_RECIPIENT,
1621                                 WLAN_REASON_QSTA_REQUIRE_SETUP,
1622                                 true);
1623                 }
1624                 mutex_unlock(&local->sta_mtx);
1625         } else switch (sdata->vif.type) {
1626         case NL80211_IFTYPE_STATION:
1627                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1628                 break;
1629         case NL80211_IFTYPE_ADHOC:
1630                 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1631                 break;
1632         case NL80211_IFTYPE_MESH_POINT:
1633                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1634                         break;
1635                 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1636                 break;
1637         default:
1638                 WARN(1, "frame for unexpected interface type");
1639                 break;
1640         }
1641 }
1642
1643 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata,
1644                                            struct sk_buff *skb)
1645 {
1646         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1647
1648         if (ieee80211_is_action(mgmt->frame_control) &&
1649             mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1650                 switch (mgmt->u.action.u.s1g.action_code) {
1651                 case WLAN_S1G_TWT_TEARDOWN:
1652                 case WLAN_S1G_TWT_SETUP:
1653                         ieee80211_s1g_status_twt_action(sdata, skb);
1654                         break;
1655                 default:
1656                         break;
1657                 }
1658         }
1659 }
1660
1661 static void ieee80211_iface_work(struct work_struct *work)
1662 {
1663         struct ieee80211_sub_if_data *sdata =
1664                 container_of(work, struct ieee80211_sub_if_data, work);
1665         struct ieee80211_local *local = sdata->local;
1666         struct sk_buff *skb;
1667
1668         if (!ieee80211_sdata_running(sdata))
1669                 return;
1670
1671         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1672                 return;
1673
1674         if (!ieee80211_can_run_worker(local))
1675                 return;
1676
1677         /* first process frames */
1678         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1679                 kcov_remote_start_common(skb_get_kcov_handle(skb));
1680
1681                 if (skb->protocol == cpu_to_be16(ETH_P_TDLS))
1682                         ieee80211_process_tdls_channel_switch(sdata, skb);
1683                 else
1684                         ieee80211_iface_process_skb(local, sdata, skb);
1685
1686                 kfree_skb(skb);
1687                 kcov_remote_stop();
1688         }
1689
1690         /* process status queue */
1691         while ((skb = skb_dequeue(&sdata->status_queue))) {
1692                 kcov_remote_start_common(skb_get_kcov_handle(skb));
1693
1694                 ieee80211_iface_process_status(sdata, skb);
1695                 kfree_skb(skb);
1696
1697                 kcov_remote_stop();
1698         }
1699
1700         /* then other type-dependent work */
1701         switch (sdata->vif.type) {
1702         case NL80211_IFTYPE_STATION:
1703                 ieee80211_sta_work(sdata);
1704                 break;
1705         case NL80211_IFTYPE_ADHOC:
1706                 ieee80211_ibss_work(sdata);
1707                 break;
1708         case NL80211_IFTYPE_MESH_POINT:
1709                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1710                         break;
1711                 ieee80211_mesh_work(sdata);
1712                 break;
1713         case NL80211_IFTYPE_OCB:
1714                 ieee80211_ocb_work(sdata);
1715                 break;
1716         default:
1717                 break;
1718         }
1719 }
1720
1721 static void ieee80211_recalc_smps_work(struct work_struct *work)
1722 {
1723         struct ieee80211_sub_if_data *sdata =
1724                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1725
1726         ieee80211_recalc_smps(sdata, &sdata->deflink);
1727 }
1728
1729 static void ieee80211_activate_links_work(struct work_struct *work)
1730 {
1731         struct ieee80211_sub_if_data *sdata =
1732                 container_of(work, struct ieee80211_sub_if_data,
1733                              activate_links_work);
1734
1735         ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links);
1736 }
1737
1738 /*
1739  * Helper function to initialise an interface to a specific type.
1740  */
1741 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1742                                   enum nl80211_iftype type)
1743 {
1744         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1745                                                     0xff, 0xff, 0xff};
1746
1747         /* clear type-dependent unions */
1748         memset(&sdata->u, 0, sizeof(sdata->u));
1749         memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u));
1750
1751         /* and set some type-dependent values */
1752         sdata->vif.type = type;
1753         sdata->vif.p2p = false;
1754         sdata->wdev.iftype = type;
1755
1756         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1757         sdata->control_port_no_encrypt = false;
1758         sdata->control_port_over_nl80211 = false;
1759         sdata->control_port_no_preauth = false;
1760         sdata->vif.cfg.idle = true;
1761         sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1762
1763         sdata->noack_map = 0;
1764
1765         /* only monitor/p2p-device differ */
1766         if (sdata->dev) {
1767                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1768                 sdata->dev->type = ARPHRD_ETHER;
1769         }
1770
1771         skb_queue_head_init(&sdata->skb_queue);
1772         skb_queue_head_init(&sdata->status_queue);
1773         INIT_WORK(&sdata->work, ieee80211_iface_work);
1774         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1775         INIT_WORK(&sdata->activate_links_work, ieee80211_activate_links_work);
1776
1777         switch (type) {
1778         case NL80211_IFTYPE_P2P_GO:
1779                 type = NL80211_IFTYPE_AP;
1780                 sdata->vif.type = type;
1781                 sdata->vif.p2p = true;
1782                 fallthrough;
1783         case NL80211_IFTYPE_AP:
1784                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1785                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1786                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1787                 break;
1788         case NL80211_IFTYPE_P2P_CLIENT:
1789                 type = NL80211_IFTYPE_STATION;
1790                 sdata->vif.type = type;
1791                 sdata->vif.p2p = true;
1792                 fallthrough;
1793         case NL80211_IFTYPE_STATION:
1794                 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid;
1795                 ieee80211_sta_setup_sdata(sdata);
1796                 break;
1797         case NL80211_IFTYPE_OCB:
1798                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1799                 ieee80211_ocb_setup_sdata(sdata);
1800                 break;
1801         case NL80211_IFTYPE_ADHOC:
1802                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1803                 ieee80211_ibss_setup_sdata(sdata);
1804                 break;
1805         case NL80211_IFTYPE_MESH_POINT:
1806                 if (ieee80211_vif_is_mesh(&sdata->vif))
1807                         ieee80211_mesh_init_sdata(sdata);
1808                 break;
1809         case NL80211_IFTYPE_MONITOR:
1810                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1811                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1812                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1813                                       MONITOR_FLAG_OTHER_BSS;
1814                 break;
1815         case NL80211_IFTYPE_NAN:
1816                 idr_init(&sdata->u.nan.function_inst_ids);
1817                 spin_lock_init(&sdata->u.nan.func_lock);
1818                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1819                 break;
1820         case NL80211_IFTYPE_AP_VLAN:
1821         case NL80211_IFTYPE_P2P_DEVICE:
1822                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1823                 break;
1824         case NL80211_IFTYPE_UNSPECIFIED:
1825         case NL80211_IFTYPE_WDS:
1826         case NUM_NL80211_IFTYPES:
1827                 WARN_ON(1);
1828                 break;
1829         }
1830
1831         /* need to do this after the switch so vif.type is correct */
1832         ieee80211_link_setup(&sdata->deflink);
1833
1834         ieee80211_debugfs_add_netdev(sdata);
1835 }
1836
1837 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1838                                            enum nl80211_iftype type)
1839 {
1840         struct ieee80211_local *local = sdata->local;
1841         int ret, err;
1842         enum nl80211_iftype internal_type = type;
1843         bool p2p = false;
1844
1845         ASSERT_RTNL();
1846
1847         if (!local->ops->change_interface)
1848                 return -EBUSY;
1849
1850         /* for now, don't support changing while links exist */
1851         if (sdata->vif.valid_links)
1852                 return -EBUSY;
1853
1854         switch (sdata->vif.type) {
1855         case NL80211_IFTYPE_AP:
1856                 if (!list_empty(&sdata->u.ap.vlans))
1857                         return -EBUSY;
1858                 break;
1859         case NL80211_IFTYPE_STATION:
1860         case NL80211_IFTYPE_ADHOC:
1861         case NL80211_IFTYPE_OCB:
1862                 /*
1863                  * Could maybe also all others here?
1864                  * Just not sure how that interacts
1865                  * with the RX/config path e.g. for
1866                  * mesh.
1867                  */
1868                 break;
1869         default:
1870                 return -EBUSY;
1871         }
1872
1873         switch (type) {
1874         case NL80211_IFTYPE_AP:
1875         case NL80211_IFTYPE_STATION:
1876         case NL80211_IFTYPE_ADHOC:
1877         case NL80211_IFTYPE_OCB:
1878                 /*
1879                  * Could probably support everything
1880                  * but here.
1881                  */
1882                 break;
1883         case NL80211_IFTYPE_P2P_CLIENT:
1884                 p2p = true;
1885                 internal_type = NL80211_IFTYPE_STATION;
1886                 break;
1887         case NL80211_IFTYPE_P2P_GO:
1888                 p2p = true;
1889                 internal_type = NL80211_IFTYPE_AP;
1890                 break;
1891         default:
1892                 return -EBUSY;
1893         }
1894
1895         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1896         if (ret)
1897                 return ret;
1898
1899         ieee80211_stop_vif_queues(local, sdata,
1900                                   IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1901         synchronize_net();
1902
1903         ieee80211_do_stop(sdata, false);
1904
1905         ieee80211_teardown_sdata(sdata);
1906
1907         ieee80211_set_sdata_offload_flags(sdata);
1908         ret = drv_change_interface(local, sdata, internal_type, p2p);
1909         if (ret)
1910                 type = ieee80211_vif_type_p2p(&sdata->vif);
1911
1912         /*
1913          * Ignore return value here, there's not much we can do since
1914          * the driver changed the interface type internally already.
1915          * The warnings will hopefully make driver authors fix it :-)
1916          */
1917         ieee80211_check_queues(sdata, type);
1918
1919         ieee80211_setup_sdata(sdata, type);
1920         ieee80211_set_vif_encap_ops(sdata);
1921
1922         err = ieee80211_do_open(&sdata->wdev, false);
1923         WARN(err, "type change: do_open returned %d", err);
1924
1925         ieee80211_wake_vif_queues(local, sdata,
1926                                   IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1927         return ret;
1928 }
1929
1930 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1931                              enum nl80211_iftype type)
1932 {
1933         int ret;
1934
1935         ASSERT_RTNL();
1936
1937         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1938                 return 0;
1939
1940         if (ieee80211_sdata_running(sdata)) {
1941                 ret = ieee80211_runtime_change_iftype(sdata, type);
1942                 if (ret)
1943                         return ret;
1944         } else {
1945                 /* Purge and reset type-dependent state. */
1946                 ieee80211_teardown_sdata(sdata);
1947                 ieee80211_setup_sdata(sdata, type);
1948         }
1949
1950         /* reset some values that shouldn't be kept across type changes */
1951         if (type == NL80211_IFTYPE_STATION)
1952                 sdata->u.mgd.use_4addr = false;
1953
1954         return 0;
1955 }
1956
1957 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1958                                        u8 *perm_addr, enum nl80211_iftype type)
1959 {
1960         struct ieee80211_sub_if_data *sdata;
1961         u64 mask, start, addr, val, inc;
1962         u8 *m;
1963         u8 tmp_addr[ETH_ALEN];
1964         int i;
1965
1966         /* default ... something at least */
1967         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1968
1969         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1970             local->hw.wiphy->n_addresses <= 1)
1971                 return;
1972
1973         mutex_lock(&local->iflist_mtx);
1974
1975         switch (type) {
1976         case NL80211_IFTYPE_MONITOR:
1977                 /* doesn't matter */
1978                 break;
1979         case NL80211_IFTYPE_AP_VLAN:
1980                 /* match up with an AP interface */
1981                 list_for_each_entry(sdata, &local->interfaces, list) {
1982                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1983                                 continue;
1984                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1985                         break;
1986                 }
1987                 /* keep default if no AP interface present */
1988                 break;
1989         case NL80211_IFTYPE_P2P_CLIENT:
1990         case NL80211_IFTYPE_P2P_GO:
1991                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1992                         list_for_each_entry(sdata, &local->interfaces, list) {
1993                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1994                                         continue;
1995                                 if (!ieee80211_sdata_running(sdata))
1996                                         continue;
1997                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1998                                 goto out_unlock;
1999                         }
2000                 }
2001                 fallthrough;
2002         default:
2003                 /* assign a new address if possible -- try n_addresses first */
2004                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
2005                         bool used = false;
2006
2007                         list_for_each_entry(sdata, &local->interfaces, list) {
2008                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
2009                                                      sdata->vif.addr)) {
2010                                         used = true;
2011                                         break;
2012                                 }
2013                         }
2014
2015                         if (!used) {
2016                                 memcpy(perm_addr,
2017                                        local->hw.wiphy->addresses[i].addr,
2018                                        ETH_ALEN);
2019                                 break;
2020                         }
2021                 }
2022
2023                 /* try mask if available */
2024                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
2025                         break;
2026
2027                 m = local->hw.wiphy->addr_mask;
2028                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
2029                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
2030                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
2031
2032                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
2033                         /* not a contiguous mask ... not handled now! */
2034                         pr_info("not contiguous\n");
2035                         break;
2036                 }
2037
2038                 /*
2039                  * Pick address of existing interface in case user changed
2040                  * MAC address manually, default to perm_addr.
2041                  */
2042                 m = local->hw.wiphy->perm_addr;
2043                 list_for_each_entry(sdata, &local->interfaces, list) {
2044                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
2045                                 continue;
2046                         m = sdata->vif.addr;
2047                         break;
2048                 }
2049                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
2050                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
2051                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
2052
2053                 inc = 1ULL<<__ffs64(mask);
2054                 val = (start & mask);
2055                 addr = (start & ~mask) | (val & mask);
2056                 do {
2057                         bool used = false;
2058
2059                         tmp_addr[5] = addr >> 0*8;
2060                         tmp_addr[4] = addr >> 1*8;
2061                         tmp_addr[3] = addr >> 2*8;
2062                         tmp_addr[2] = addr >> 3*8;
2063                         tmp_addr[1] = addr >> 4*8;
2064                         tmp_addr[0] = addr >> 5*8;
2065
2066                         val += inc;
2067
2068                         list_for_each_entry(sdata, &local->interfaces, list) {
2069                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
2070                                         used = true;
2071                                         break;
2072                                 }
2073                         }
2074
2075                         if (!used) {
2076                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
2077                                 break;
2078                         }
2079                         addr = (start & ~mask) | (val & mask);
2080                 } while (addr != start);
2081
2082                 break;
2083         }
2084
2085  out_unlock:
2086         mutex_unlock(&local->iflist_mtx);
2087 }
2088
2089 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
2090                      unsigned char name_assign_type,
2091                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
2092                      struct vif_params *params)
2093 {
2094         struct net_device *ndev = NULL;
2095         struct ieee80211_sub_if_data *sdata = NULL;
2096         struct txq_info *txqi;
2097         void (*if_setup)(struct net_device *dev);
2098         int ret, i;
2099         int txqs = 1;
2100
2101         ASSERT_RTNL();
2102
2103         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
2104                 struct wireless_dev *wdev;
2105
2106                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
2107                                 GFP_KERNEL);
2108                 if (!sdata)
2109                         return -ENOMEM;
2110                 wdev = &sdata->wdev;
2111
2112                 sdata->dev = NULL;
2113                 strscpy(sdata->name, name, IFNAMSIZ);
2114                 ieee80211_assign_perm_addr(local, wdev->address, type);
2115                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
2116                 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
2117         } else {
2118                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
2119                                  sizeof(void *));
2120                 int txq_size = 0;
2121
2122                 if (local->ops->wake_tx_queue &&
2123                     type != NL80211_IFTYPE_AP_VLAN &&
2124                     (type != NL80211_IFTYPE_MONITOR ||
2125                      (params->flags & MONITOR_FLAG_ACTIVE)))
2126                         txq_size += sizeof(struct txq_info) +
2127                                     local->hw.txq_data_size;
2128
2129                 if (local->ops->wake_tx_queue) {
2130                         if_setup = ieee80211_if_setup_no_queue;
2131                 } else {
2132                         if_setup = ieee80211_if_setup;
2133                         if (local->hw.queues >= IEEE80211_NUM_ACS)
2134                                 txqs = IEEE80211_NUM_ACS;
2135                 }
2136
2137                 ndev = alloc_netdev_mqs(size + txq_size,
2138                                         name, name_assign_type,
2139                                         if_setup, txqs, 1);
2140                 if (!ndev)
2141                         return -ENOMEM;
2142
2143                 if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len)
2144                         ndev->tx_queue_len = local->hw.wiphy->tx_queue_len;
2145
2146                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
2147
2148                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2149                 if (!ndev->tstats) {
2150                         free_netdev(ndev);
2151                         return -ENOMEM;
2152                 }
2153
2154                 ndev->needed_headroom = local->tx_headroom +
2155                                         4*6 /* four MAC addresses */
2156                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
2157                                         + 6 /* mesh */
2158                                         + 8 /* rfc1042/bridge tunnel */
2159                                         - ETH_HLEN /* ethernet hard_header_len */
2160                                         + IEEE80211_ENCRYPT_HEADROOM;
2161                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
2162
2163                 ret = dev_alloc_name(ndev, ndev->name);
2164                 if (ret < 0) {
2165                         ieee80211_if_free(ndev);
2166                         free_netdev(ndev);
2167                         return ret;
2168                 }
2169
2170                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
2171                 if (is_valid_ether_addr(params->macaddr))
2172                         eth_hw_addr_set(ndev, params->macaddr);
2173                 else
2174                         eth_hw_addr_set(ndev, ndev->perm_addr);
2175                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
2176
2177                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
2178                 sdata = netdev_priv(ndev);
2179                 ndev->ieee80211_ptr = &sdata->wdev;
2180                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
2181                 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
2182                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
2183
2184                 if (txq_size) {
2185                         txqi = netdev_priv(ndev) + size;
2186                         ieee80211_txq_init(sdata, NULL, txqi, 0);
2187                 }
2188
2189                 sdata->dev = ndev;
2190         }
2191
2192         /* initialise type-independent data */
2193         sdata->wdev.wiphy = local->hw.wiphy;
2194
2195         ieee80211_sdata_init(local, sdata);
2196
2197         ieee80211_init_frag_cache(&sdata->frags);
2198
2199         INIT_LIST_HEAD(&sdata->key_list);
2200
2201         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
2202                           ieee80211_delayed_tailroom_dec);
2203
2204         for (i = 0; i < NUM_NL80211_BANDS; i++) {
2205                 struct ieee80211_supported_band *sband;
2206                 sband = local->hw.wiphy->bands[i];
2207                 sdata->rc_rateidx_mask[i] =
2208                         sband ? (1 << sband->n_bitrates) - 1 : 0;
2209                 if (sband) {
2210                         __le16 cap;
2211                         u16 *vht_rate_mask;
2212
2213                         memcpy(sdata->rc_rateidx_mcs_mask[i],
2214                                sband->ht_cap.mcs.rx_mask,
2215                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
2216
2217                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
2218                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
2219                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
2220                 } else {
2221                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
2222                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
2223                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
2224                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
2225                 }
2226         }
2227
2228         ieee80211_set_default_queues(sdata);
2229
2230         sdata->deflink.ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2231         sdata->deflink.user_power_level = local->user_power_level;
2232
2233         /* setup type-dependent data */
2234         ieee80211_setup_sdata(sdata, type);
2235
2236         if (ndev) {
2237                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
2238                 if (type == NL80211_IFTYPE_STATION)
2239                         sdata->u.mgd.use_4addr = params->use_4addr;
2240
2241                 ndev->features |= local->hw.netdev_features;
2242                 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2243                 ndev->hw_features |= ndev->features &
2244                                         MAC80211_SUPPORTED_FEATURES_TX;
2245
2246                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
2247
2248                 /* MTU range is normally 256 - 2304, where the upper limit is
2249                  * the maximum MSDU size. Monitor interfaces send and receive
2250                  * MPDU and A-MSDU frames which may be much larger so we do
2251                  * not impose an upper limit in that case.
2252                  */
2253                 ndev->min_mtu = 256;
2254                 if (type == NL80211_IFTYPE_MONITOR)
2255                         ndev->max_mtu = 0;
2256                 else
2257                         ndev->max_mtu = local->hw.max_mtu;
2258
2259                 ret = cfg80211_register_netdevice(ndev);
2260                 if (ret) {
2261                         free_netdev(ndev);
2262                         return ret;
2263                 }
2264         }
2265
2266         mutex_lock(&local->iflist_mtx);
2267         list_add_tail_rcu(&sdata->list, &local->interfaces);
2268         mutex_unlock(&local->iflist_mtx);
2269
2270         if (new_wdev)
2271                 *new_wdev = &sdata->wdev;
2272
2273         return 0;
2274 }
2275
2276 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2277 {
2278         ASSERT_RTNL();
2279
2280         mutex_lock(&sdata->local->iflist_mtx);
2281         list_del_rcu(&sdata->list);
2282         mutex_unlock(&sdata->local->iflist_mtx);
2283
2284         if (sdata->vif.txq)
2285                 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2286
2287         synchronize_rcu();
2288
2289         cfg80211_unregister_wdev(&sdata->wdev);
2290
2291         if (!sdata->dev) {
2292                 ieee80211_teardown_sdata(sdata);
2293                 kfree(sdata);
2294         }
2295 }
2296
2297 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2298 {
2299         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2300                 return;
2301         ieee80211_do_stop(sdata, true);
2302 }
2303
2304 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2305 {
2306         struct ieee80211_sub_if_data *sdata, *tmp;
2307         LIST_HEAD(unreg_list);
2308         LIST_HEAD(wdev_list);
2309
2310         ASSERT_RTNL();
2311
2312         /* Before destroying the interfaces, make sure they're all stopped so
2313          * that the hardware is stopped. Otherwise, the driver might still be
2314          * iterating the interfaces during the shutdown, e.g. from a worker
2315          * or from RX processing or similar, and if it does so (using atomic
2316          * iteration) while we're manipulating the list, the iteration will
2317          * crash.
2318          *
2319          * After this, the hardware should be stopped and the driver should
2320          * have stopped all of its activities, so that we can do RCU-unaware
2321          * manipulations of the interface list below.
2322          */
2323         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2324
2325         WARN(local->open_count, "%s: open count remains %d\n",
2326              wiphy_name(local->hw.wiphy), local->open_count);
2327
2328         ieee80211_txq_teardown_flows(local);
2329
2330         mutex_lock(&local->iflist_mtx);
2331         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
2332                 list_del(&sdata->list);
2333
2334                 if (sdata->dev)
2335                         unregister_netdevice_queue(sdata->dev, &unreg_list);
2336                 else
2337                         list_add(&sdata->list, &wdev_list);
2338         }
2339         mutex_unlock(&local->iflist_mtx);
2340
2341         unregister_netdevice_many(&unreg_list);
2342
2343         wiphy_lock(local->hw.wiphy);
2344         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2345                 list_del(&sdata->list);
2346                 cfg80211_unregister_wdev(&sdata->wdev);
2347                 kfree(sdata);
2348         }
2349         wiphy_unlock(local->hw.wiphy);
2350 }
2351
2352 static int netdev_notify(struct notifier_block *nb,
2353                          unsigned long state, void *ptr)
2354 {
2355         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2356         struct ieee80211_sub_if_data *sdata;
2357
2358         if (state != NETDEV_CHANGENAME)
2359                 return NOTIFY_DONE;
2360
2361         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2362                 return NOTIFY_DONE;
2363
2364         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2365                 return NOTIFY_DONE;
2366
2367         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2368         memcpy(sdata->name, dev->name, IFNAMSIZ);
2369         ieee80211_debugfs_rename_netdev(sdata);
2370
2371         return NOTIFY_OK;
2372 }
2373
2374 static struct notifier_block mac80211_netdev_notifier = {
2375         .notifier_call = netdev_notify,
2376 };
2377
2378 int ieee80211_iface_init(void)
2379 {
2380         return register_netdevice_notifier(&mac80211_netdev_notifier);
2381 }
2382
2383 void ieee80211_iface_exit(void)
2384 {
2385         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2386 }
2387
2388 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2389 {
2390         if (sdata->vif.type == NL80211_IFTYPE_AP)
2391                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2392         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2393                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2394 }
2395
2396 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2397 {
2398         if (sdata->vif.type == NL80211_IFTYPE_AP)
2399                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2400         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2401                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2402 }