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) 2018-2025 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 *and* wiphy mutex
  37  *     *and* iflist_mtx
  38  * (2) modifications are done in an RCU manner so atomic readers
  39  *     can traverse the list in RCU-safe blocks.
  40  *
  41  * As a consequence, reads (traversals) of the list can be protected
  42  * by either the RTNL, the wiphy mutex, the iflist_mtx or RCU.
  43  */
  44
  45 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work);
  46
  47 bool __ieee80211_recalc_txpower(struct ieee80211_link_data *link)
  48 {
  49         struct ieee80211_chanctx_conf *chanctx_conf;
  50         int power;
  51
  52         rcu_read_lock();
  53         chanctx_conf = rcu_dereference(link->conf->chanctx_conf);
  54         if (!chanctx_conf) {
  55                 rcu_read_unlock();
  56                 return false;
  57         }
  58
  59         power = ieee80211_chandef_max_power(&chanctx_conf->def);
  60         rcu_read_unlock();
  61
  62         if (link->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  63                 power = min(power, link->user_power_level);
  64
  65         if (link->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  66                 power = min(power, link->ap_power_level);
  67
  68         if (power != link->conf->txpower) {
  69                 link->conf->txpower = power;
  70                 return true;
  71         }
  72
  73         return false;
  74 }
  75
  76 void ieee80211_recalc_txpower(struct ieee80211_link_data *link,
  77                               bool update_bss)
  78 {
  79         if (__ieee80211_recalc_txpower(link) ||
  80             (update_bss && ieee80211_sdata_running(link->sdata)))
  81                 ieee80211_link_info_change_notify(link->sdata, link,
  82                                                   BSS_CHANGED_TXPOWER);
  83 }
  84
  85 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
  86 {
  87         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  88                 return 0;
  89
  90         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  91         return IEEE80211_CONF_CHANGE_IDLE;
  92 }
  93
  94 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  95 {
  96         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  97                 return 0;
  98
  99         ieee80211_flush_queues(local, NULL, false);
 100
 101         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 102         return IEEE80211_CONF_CHANGE_IDLE;
 103 }
 104
 105 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
 106                                    bool force_active)
 107 {
 108         bool working, scanning, active;
 109         unsigned int led_trig_start = 0, led_trig_stop = 0;
 110
 111         lockdep_assert_wiphy(local->hw.wiphy);
 112
 113         active = force_active ||
 114                  !list_empty(&local->chanctx_list) ||
 115                  local->monitors;
 116
 117         working = !local->ops->remain_on_channel &&
 118                   !list_empty(&local->roc_list);
 119
 120         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 121                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 122
 123         if (working || scanning)
 124                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 125         else
 126                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 127
 128         if (active)
 129                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 130         else
 131                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 132
 133         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 134
 135         if (working || scanning || active)
 136                 return __ieee80211_idle_off(local);
 137         return __ieee80211_idle_on(local);
 138 }
 139
 140 u32 ieee80211_idle_off(struct ieee80211_local *local)
 141 {
 142         return __ieee80211_recalc_idle(local, true);
 143 }
 144
 145 void ieee80211_recalc_idle(struct ieee80211_local *local)
 146 {
 147         u32 change = __ieee80211_recalc_idle(local, false);
 148         if (change)
 149                 ieee80211_hw_config(local, change);
 150 }
 151
 152 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 153                                 bool check_dup)
 154 {
 155         struct ieee80211_local *local = sdata->local;
 156         struct ieee80211_sub_if_data *iter;
 157         u64 new, mask, tmp;
 158         u8 *m;
 159         int ret = 0;
 160
 161         lockdep_assert_wiphy(local->hw.wiphy);
 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         list_for_each_entry(iter, &local->interfaces, list) {
 180                 if (iter == sdata)
 181                         continue;
 182
 183                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 184                     !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 185                         continue;
 186
 187                 m = iter->vif.addr;
 188                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 189                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 190                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 191
 192                 if ((new & ~mask) != (tmp & ~mask)) {
 193                         ret = -EINVAL;
 194                         break;
 195                 }
 196         }
 197
 198         return ret;
 199 }
 200
 201 static int ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data *sdata)
 202 {
 203         struct ieee80211_roc_work *roc;
 204         struct ieee80211_local *local = sdata->local;
 205         struct ieee80211_sub_if_data *scan_sdata;
 206         int ret = 0;
 207
 208         lockdep_assert_wiphy(local->hw.wiphy);
 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         /* First check no ROC work is happening on this iface */
 218         list_for_each_entry(roc, &local->roc_list, list) {
 219                 if (roc->sdata != sdata)
 220                         continue;
 221
 222                 if (roc->started) {
 223                         ret = -EBUSY;
 224                         goto unlock;
 225                 }
 226         }
 227
 228         /* And if this iface is scanning */
 229         if (local->scanning) {
 230                 scan_sdata = rcu_dereference_protected(local->scan_sdata,
 231                                                        lockdep_is_held(&local->hw.wiphy->mtx));
 232                 if (sdata == scan_sdata)
 233                         ret = -EBUSY;
 234         }
 235
 236         switch (sdata->vif.type) {
 237         case NL80211_IFTYPE_STATION:
 238         case NL80211_IFTYPE_P2P_CLIENT:
 239                 /* More interface types could be added here but changing the
 240                  * address while powered makes the most sense in client modes.
 241                  */
 242                 break;
 243         default:
 244                 ret = -EOPNOTSUPP;
 245         }
 246
 247 unlock:
 248         return ret;
 249 }
 250
 251 static int _ieee80211_change_mac(struct ieee80211_sub_if_data *sdata,
 252                                  void *addr)
 253 {
 254         struct ieee80211_local *local = sdata->local;
 255         struct sockaddr *sa = addr;
 256         bool check_dup = true;
 257         bool live = false;
 258         int ret;
 259
 260         if (ieee80211_sdata_running(sdata)) {
 261                 ret = ieee80211_can_powered_addr_change(sdata);
 262                 if (ret)
 263                         return ret;
 264
 265                 live = true;
 266         }
 267
 268         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 269             !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 270                 check_dup = false;
 271
 272         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 273         if (ret)
 274                 return ret;
 275
 276         if (live)
 277                 drv_remove_interface(local, sdata);
 278         ret = eth_mac_addr(sdata->dev, sa);
 279
 280         if (ret == 0) {
 281                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 282                 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
 283         }
 284
 285         /* Regardless of eth_mac_addr() return we still want to add the
 286          * interface back. This should not fail...
 287          */
 288         if (live)
 289                 WARN_ON(drv_add_interface(local, sdata));
 290
 291         return ret;
 292 }
 293
 294 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 295 {
 296         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 297         struct ieee80211_local *local = sdata->local;
 298
 299         /*
 300          * This happens during unregistration if there's a bond device
 301          * active (maybe other cases?) and we must get removed from it.
 302          * But we really don't care anymore if it's not registered now.
 303          */
 304         if (!dev->ieee80211_ptr->registered)
 305                 return 0;
 306
 307         guard(wiphy)(local->hw.wiphy);
 308
 309         return _ieee80211_change_mac(sdata, addr);
 310 }
 311
 312 static inline int identical_mac_addr_allowed(int type1, int type2)
 313 {
 314         return type1 == NL80211_IFTYPE_MONITOR ||
 315                 type2 == NL80211_IFTYPE_MONITOR ||
 316                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 317                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 318                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 319                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 320                         (type2 == NL80211_IFTYPE_AP ||
 321                          type2 == NL80211_IFTYPE_AP_VLAN));
 322 }
 323
 324 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 325                                             enum nl80211_iftype iftype)
 326 {
 327         struct ieee80211_local *local = sdata->local;
 328         struct ieee80211_sub_if_data *nsdata;
 329
 330         ASSERT_RTNL();
 331         lockdep_assert_wiphy(local->hw.wiphy);
 332
 333         /* we hold the RTNL here so can safely walk the list */
 334         list_for_each_entry(nsdata, &local->interfaces, list) {
 335                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 336                         /*
 337                          * Only OCB and monitor mode may coexist
 338                          */
 339                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
 340                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
 341                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 342                              nsdata->vif.type == NL80211_IFTYPE_OCB))
 343                                 return -EBUSY;
 344
 345                         /*
 346                          * Allow only a single IBSS interface to be up at any
 347                          * time. This is restricted because beacon distribution
 348                          * cannot work properly if both are in the same IBSS.
 349                          *
 350                          * To remove this restriction we'd have to disallow them
 351                          * from setting the same SSID on different IBSS interfaces
 352                          * belonging to the same hardware. Then, however, we're
 353                          * faced with having to adopt two different TSF timers...
 354                          */
 355                         if (iftype == NL80211_IFTYPE_ADHOC &&
 356                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 357                                 return -EBUSY;
 358                         /*
 359                          * will not add another interface while any channel
 360                          * switch is active.
 361                          */
 362                         if (nsdata->vif.bss_conf.csa_active)
 363                                 return -EBUSY;
 364
 365                         /*
 366                          * The remaining checks are only performed for interfaces
 367                          * with the same MAC address.
 368                          */
 369                         if (!ether_addr_equal(sdata->vif.addr,
 370                                               nsdata->vif.addr))
 371                                 continue;
 372
 373                         /*
 374                          * check whether it may have the same address
 375                          */
 376                         if (!identical_mac_addr_allowed(iftype,
 377                                                         nsdata->vif.type))
 378                                 return -ENOTUNIQ;
 379
 380                         /* No support for VLAN with MLO yet */
 381                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 382                             sdata->wdev.use_4addr &&
 383                             nsdata->vif.type == NL80211_IFTYPE_AP &&
 384                             nsdata->vif.valid_links)
 385                                 return -EOPNOTSUPP;
 386
 387                         /*
 388                          * can only add VLANs to enabled APs
 389                          */
 390                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 391                             nsdata->vif.type == NL80211_IFTYPE_AP)
 392                                 sdata->bss = &nsdata->u.ap;
 393                 }
 394         }
 395
 396         return ieee80211_check_combinations(sdata, NULL, 0, 0, -1);
 397 }
 398
 399 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 400                                   enum nl80211_iftype iftype)
 401 {
 402         int n_queues = sdata->local->hw.queues;
 403         int i;
 404
 405         if (iftype == NL80211_IFTYPE_NAN)
 406                 return 0;
 407
 408         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 409                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 410                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 411                                          IEEE80211_INVAL_HW_QUEUE))
 412                                 return -EINVAL;
 413                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 414                                          n_queues))
 415                                 return -EINVAL;
 416                 }
 417         }
 418
 419         if ((iftype != NL80211_IFTYPE_AP &&
 420              iftype != NL80211_IFTYPE_P2P_GO &&
 421              iftype != NL80211_IFTYPE_MESH_POINT) ||
 422             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
 423                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 424                 return 0;
 425         }
 426
 427         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 428                 return -EINVAL;
 429
 430         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 431                 return -EINVAL;
 432
 433         return 0;
 434 }
 435
 436 static int ieee80211_open(struct net_device *dev)
 437 {
 438         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 439         int err;
 440
 441         /* fail early if user set an invalid address */
 442         if (!is_valid_ether_addr(dev->dev_addr))
 443                 return -EADDRNOTAVAIL;
 444
 445         guard(wiphy)(sdata->local->hw.wiphy);
 446
 447         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 448         if (err)
 449                 return err;
 450
 451         return ieee80211_do_open(&sdata->wdev, true);
 452 }
 453
 454 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down)
 455 {
 456         struct ieee80211_local *local = sdata->local;
 457         unsigned long flags;
 458         struct sk_buff_head freeq;
 459         struct sk_buff *skb, *tmp;
 460         u32 hw_reconf_flags = 0;
 461         int i, flushed;
 462         struct ps_data *ps;
 463         struct cfg80211_chan_def chandef;
 464         bool cancel_scan;
 465         struct cfg80211_nan_func *func;
 466
 467         lockdep_assert_wiphy(local->hw.wiphy);
 468
 469         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 470         synchronize_rcu(); /* flush _ieee80211_wake_txqs() */
 471
 472         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 473         if (cancel_scan)
 474                 ieee80211_scan_cancel(local);
 475
 476         ieee80211_roc_purge(local, sdata);
 477
 478         switch (sdata->vif.type) {
 479         case NL80211_IFTYPE_STATION:
 480                 ieee80211_mgd_stop(sdata);
 481                 break;
 482         case NL80211_IFTYPE_ADHOC:
 483                 ieee80211_ibss_stop(sdata);
 484                 break;
 485         case NL80211_IFTYPE_MONITOR:
 486                 list_del_rcu(&sdata->u.mntr.list);
 487                 break;
 488         case NL80211_IFTYPE_AP_VLAN:
 489                 ieee80211_apvlan_link_clear(sdata);
 490                 break;
 491         default:
 492                 break;
 493         }
 494
 495         /*
 496          * Remove all stations associated with this interface.
 497          *
 498          * This must be done before calling ops->remove_interface()
 499          * because otherwise we can later invoke ops->sta_notify()
 500          * whenever the STAs are removed, and that invalidates driver
 501          * assumptions about always getting a vif pointer that is valid
 502          * (because if we remove a STA after ops->remove_interface()
 503          * the driver will have removed the vif info already!)
 504          *
 505          * For AP_VLANs stations may exist since there's nothing else that
 506          * would have removed them, but in other modes there shouldn't
 507          * be any stations.
 508          */
 509         flushed = sta_info_flush(sdata, -1);
 510         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0);
 511
 512         /* don't count this interface for allmulti while it is down */
 513         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 514                 atomic_dec(&local->iff_allmultis);
 515
 516         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 517                 local->fif_pspoll--;
 518                 local->fif_probe_req--;
 519         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 520                 local->fif_probe_req--;
 521         }
 522
 523         if (sdata->dev) {
 524                 netif_addr_lock_bh(sdata->dev);
 525                 spin_lock_bh(&local->filter_lock);
 526                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 527                                  sdata->dev->addr_len);
 528                 spin_unlock_bh(&local->filter_lock);
 529                 netif_addr_unlock_bh(sdata->dev);
 530         }
 531
 532         timer_delete_sync(&local->dynamic_ps_timer);
 533         wiphy_work_cancel(local->hw.wiphy, &local->dynamic_ps_enable_work);
 534
 535         WARN(ieee80211_vif_is_mld(&sdata->vif),
 536              "destroying interface with valid links 0x%04x\n",
 537              sdata->vif.valid_links);
 538
 539         sdata->vif.bss_conf.csa_active = false;
 540         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 541                 sdata->deflink.u.mgd.csa.waiting_bcn = false;
 542         ieee80211_vif_unblock_queues_csa(sdata);
 543
 544         wiphy_work_cancel(local->hw.wiphy, &sdata->deflink.csa.finalize_work);
 545         wiphy_work_cancel(local->hw.wiphy,
 546                           &sdata->deflink.color_change_finalize_work);
 547         wiphy_delayed_work_cancel(local->hw.wiphy,
 548                                   &sdata->deflink.dfs_cac_timer_work);
 549
 550         if (sdata->wdev.links[0].cac_started) {
 551                 chandef = sdata->vif.bss_conf.chanreq.oper;
 552                 WARN_ON(local->suspended);
 553                 ieee80211_link_release_channel(&sdata->deflink);
 554                 cfg80211_cac_event(sdata->dev, &chandef,
 555                                    NL80211_RADAR_CAC_ABORTED,
 556                                    GFP_KERNEL, 0);
 557         }
 558
 559         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 560                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 561         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 562                 /* remove all packets in parent bc_buf pointing to this dev */
 563                 ps = &sdata->bss->ps;
 564
 565                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 566                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 567                         if (skb->dev == sdata->dev) {
 568                                 __skb_unlink(skb, &ps->bc_buf);
 569                                 local->total_ps_buffered--;
 570                                 ieee80211_free_txskb(&local->hw, skb);
 571                         }
 572                 }
 573                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 574         }
 575
 576         if (going_down)
 577                 local->open_count--;
 578
 579         switch (sdata->vif.type) {
 580         case NL80211_IFTYPE_AP_VLAN:
 581                 list_del(&sdata->u.vlan.list);
 582                 RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL);
 583                 /* see comment in the default case below */
 584                 ieee80211_free_keys(sdata, true);
 585                 /* no need to tell driver */
 586                 break;
 587         case NL80211_IFTYPE_MONITOR:
 588                 local->monitors--;
 589
 590                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) &&
 591                     !ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) {
 592
 593                         local->virt_monitors--;
 594                         if (local->virt_monitors == 0) {
 595                                 local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 596                                 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 597                         }
 598
 599                         ieee80211_adjust_monitor_flags(sdata, -1);
 600                 }
 601                 break;
 602         case NL80211_IFTYPE_NAN:
 603                 /* clean all the functions */
 604                 spin_lock_bh(&sdata->u.nan.func_lock);
 605
 606                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
 607                         idr_remove(&sdata->u.nan.function_inst_ids, i);
 608                         cfg80211_free_nan_func(func);
 609                 }
 610                 idr_destroy(&sdata->u.nan.function_inst_ids);
 611
 612                 spin_unlock_bh(&sdata->u.nan.func_lock);
 613                 break;
 614         case NL80211_IFTYPE_P2P_DEVICE:
 615                 /* relies on synchronize_rcu() below */
 616                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 617                 fallthrough;
 618         default:
 619                 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->work);
 620                 /*
 621                  * When we get here, the interface is marked down.
 622                  * Free the remaining keys, if there are any
 623                  * (which can happen in AP mode if userspace sets
 624                  * keys before the interface is operating)
 625                  *
 626                  * Force the key freeing to always synchronize_net()
 627                  * to wait for the RX path in case it is using this
 628                  * interface enqueuing frames at this very time on
 629                  * another CPU.
 630                  */
 631                 ieee80211_free_keys(sdata, true);
 632                 skb_queue_purge(&sdata->skb_queue);
 633                 skb_queue_purge(&sdata->status_queue);
 634         }
 635
 636         /*
 637          * Since ieee80211_free_txskb() may issue __dev_queue_xmit()
 638          * which should be called with interrupts enabled, reclamation
 639          * is done in two phases:
 640          */
 641         __skb_queue_head_init(&freeq);
 642
 643         /* unlink from local queues... */
 644         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 645         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 646                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 647                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 648                         if (info->control.vif == &sdata->vif) {
 649                                 __skb_unlink(skb, &local->pending[i]);
 650                                 __skb_queue_tail(&freeq, skb);
 651                         }
 652                 }
 653         }
 654         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 655
 656         /* ... and perform actual reclamation with interrupts enabled. */
 657         skb_queue_walk_safe(&freeq, skb, tmp) {
 658                 __skb_unlink(skb, &freeq);
 659                 ieee80211_free_txskb(&local->hw, skb);
 660         }
 661
 662         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 663                 ieee80211_txq_remove_vlan(local, sdata);
 664
 665         if (sdata->vif.txq)
 666                 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
 667
 668         sdata->bss = NULL;
 669
 670         if (local->open_count == 0)
 671                 ieee80211_clear_tx_pending(local);
 672
 673         sdata->vif.bss_conf.beacon_int = 0;
 674
 675         /*
 676          * If the interface goes down while suspended, presumably because
 677          * the device was unplugged and that happens before our resume,
 678          * then the driver is already unconfigured and the remainder of
 679          * this function isn't needed.
 680          * XXX: what about WoWLAN? If the device has software state, e.g.
 681          *      memory allocated, it might expect teardown commands from
 682          *      mac80211 here?
 683          */
 684         if (local->suspended) {
 685                 WARN_ON(local->wowlan);
 686                 WARN_ON(rcu_access_pointer(local->monitor_sdata));
 687                 return;
 688         }
 689
 690         switch (sdata->vif.type) {
 691         case NL80211_IFTYPE_AP_VLAN:
 692                 break;
 693         case NL80211_IFTYPE_MONITOR:
 694                 if (local->virt_monitors == 0)
 695                         ieee80211_del_virtual_monitor(local);
 696
 697                 ieee80211_recalc_idle(local);
 698                 ieee80211_recalc_offload(local);
 699
 700                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) &&
 701                     !ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR))
 702                         break;
 703
 704                 ieee80211_link_release_channel(&sdata->deflink);
 705                 fallthrough;
 706         default:
 707                 if (!going_down)
 708                         break;
 709                 drv_remove_interface(local, sdata);
 710
 711                 /* Clear private driver data to prevent reuse */
 712                 memset(sdata->vif.drv_priv, 0, local->hw.vif_data_size);
 713         }
 714
 715         ieee80211_recalc_ps(local);
 716
 717         if (cancel_scan)
 718                 wiphy_delayed_work_flush(local->hw.wiphy, &local->scan_work);
 719
 720         if (local->open_count == 0) {
 721                 ieee80211_stop_device(local, false);
 722
 723                 /* no reconfiguring after stop! */
 724                 return;
 725         }
 726
 727         /* do after stop to avoid reconfiguring when we stop anyway */
 728         ieee80211_configure_filter(local);
 729         ieee80211_hw_config(local, hw_reconf_flags);
 730
 731         if (local->virt_monitors == local->open_count)
 732                 ieee80211_add_virtual_monitor(local);
 733 }
 734
 735 void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata)
 736 {
 737         struct ieee80211_sub_if_data *tx_sdata;
 738         struct ieee80211_bss_conf *link_conf, *tx_bss_conf;
 739         struct ieee80211_link_data *tx_link, *link;
 740         unsigned int link_id;
 741
 742         lockdep_assert_wiphy(sdata->local->hw.wiphy);
 743
 744         /* Check if any of the links of current sdata is an MBSSID. */
 745         for_each_vif_active_link(&sdata->vif, link_conf, link_id) {
 746                 tx_bss_conf = sdata_dereference(link_conf->tx_bss_conf, sdata);
 747                 if (!tx_bss_conf)
 748                         continue;
 749
 750                 tx_sdata = vif_to_sdata(tx_bss_conf->vif);
 751                 RCU_INIT_POINTER(link_conf->tx_bss_conf, NULL);
 752
 753                 /* If we are not tx sdata reset tx sdata's tx_bss_conf to avoid recusrion
 754                  * while closing tx sdata at the end of outer loop below.
 755                  */
 756                 if (sdata != tx_sdata) {
 757                         tx_link = sdata_dereference(tx_sdata->link[tx_bss_conf->link_id],
 758                                                     tx_sdata);
 759                         if (!tx_link)
 760                                 continue;
 761
 762                         RCU_INIT_POINTER(tx_link->conf->tx_bss_conf, NULL);
 763                 }
 764
 765                 /* loop through sdatas to find if any of their links
 766                  * belong to same MBSSID set as the one getting deleted.
 767                  */
 768                 for_each_sdata_link(tx_sdata->local, link) {
 769                         struct ieee80211_sub_if_data *link_sdata = link->sdata;
 770
 771                         if (link_sdata == sdata || link_sdata == tx_sdata ||
 772                             rcu_access_pointer(link->conf->tx_bss_conf) != tx_bss_conf)
 773                                 continue;
 774
 775                         RCU_INIT_POINTER(link->conf->tx_bss_conf, NULL);
 776
 777                         /* Remove all links of matching MLD until dynamic link
 778                          * removal can be supported.
 779                          */
 780                         cfg80211_stop_iface(link_sdata->wdev.wiphy, &link_sdata->wdev,
 781                                             GFP_KERNEL);
 782                 }
 783
 784                 /* If we are not tx sdata, remove links of tx sdata and proceed */
 785                 if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata))
 786                         cfg80211_stop_iface(tx_sdata->wdev.wiphy,
 787                                             &tx_sdata->wdev, GFP_KERNEL);
 788         }
 789 }
 790
 791 static int ieee80211_stop(struct net_device *dev)
 792 {
 793         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 794
 795         /* close dependent VLAN interfaces before locking wiphy */
 796         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 797                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 798
 799                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 800                                          u.vlan.list)
 801                         dev_close(vlan->dev);
 802         }
 803
 804         guard(wiphy)(sdata->local->hw.wiphy);
 805
 806         wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->activate_links_work);
 807
 808         /* Close the dependent MBSSID interfaces with wiphy lock as we may be
 809          * terminating its partner links too in case of MLD.
 810          */
 811         if (sdata->vif.type == NL80211_IFTYPE_AP)
 812                 ieee80211_stop_mbssid(sdata);
 813
 814         ieee80211_do_stop(sdata, true);
 815
 816         return 0;
 817 }
 818
 819 static void ieee80211_set_multicast_list(struct net_device *dev)
 820 {
 821         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 822         struct ieee80211_local *local = sdata->local;
 823         int allmulti, sdata_allmulti;
 824
 825         allmulti = !!(dev->flags & IFF_ALLMULTI);
 826         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 827
 828         if (allmulti != sdata_allmulti) {
 829                 if (dev->flags & IFF_ALLMULTI)
 830                         atomic_inc(&local->iff_allmultis);
 831                 else
 832                         atomic_dec(&local->iff_allmultis);
 833                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 834         }
 835
 836         spin_lock_bh(&local->filter_lock);
 837         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 838         spin_unlock_bh(&local->filter_lock);
 839         wiphy_work_queue(local->hw.wiphy, &local->reconfig_filter);
 840 }
 841
 842 /*
 843  * Called when the netdev is removed or, by the code below, before
 844  * the interface type changes.
 845  */
 846 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 847 {
 848         if (WARN_ON(!list_empty(&sdata->work.entry)))
 849                 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->work);
 850
 851         /* free extra data */
 852         ieee80211_free_keys(sdata, false);
 853
 854         ieee80211_debugfs_remove_netdev(sdata);
 855
 856         ieee80211_destroy_frag_cache(&sdata->frags);
 857
 858         if (ieee80211_vif_is_mesh(&sdata->vif))
 859                 ieee80211_mesh_teardown_sdata(sdata);
 860
 861         ieee80211_vif_clear_links(sdata);
 862         ieee80211_link_stop(&sdata->deflink);
 863 }
 864
 865 static void ieee80211_uninit(struct net_device *dev)
 866 {
 867         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
 868 }
 869
 870 static int ieee80211_netdev_setup_tc(struct net_device *dev,
 871                                      enum tc_setup_type type, void *type_data)
 872 {
 873         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 874         struct ieee80211_local *local = sdata->local;
 875
 876         return drv_net_setup_tc(local, sdata, dev, type, type_data);
 877 }
 878
 879 static const struct net_device_ops ieee80211_dataif_ops = {
 880         .ndo_open               = ieee80211_open,
 881         .ndo_stop               = ieee80211_stop,
 882         .ndo_uninit             = ieee80211_uninit,
 883         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 884         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 885         .ndo_set_mac_address    = ieee80211_change_mac,
 886         .ndo_setup_tc           = ieee80211_netdev_setup_tc,
 887 };
 888
 889 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 890                                           struct sk_buff *skb,
 891                                           struct net_device *sb_dev)
 892 {
 893         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 894         struct ieee80211_local *local = sdata->local;
 895         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 896         struct ieee80211_hdr *hdr;
 897         int len_rthdr;
 898
 899         if (local->hw.queues < IEEE80211_NUM_ACS)
 900                 return 0;
 901
 902         /* reset flags and info before parsing radiotap header */
 903         memset(info, 0, sizeof(*info));
 904
 905         if (!ieee80211_parse_tx_radiotap(skb, dev))
 906                 return 0; /* doesn't matter, frame will be dropped */
 907
 908         len_rthdr = ieee80211_get_radiotap_len(skb->data);
 909         hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
 910         if (skb->len < len_rthdr + 2 ||
 911             skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
 912                 return 0; /* doesn't matter, frame will be dropped */
 913
 914         return ieee80211_select_queue_80211(sdata, skb, hdr);
 915 }
 916
 917 static const struct net_device_ops ieee80211_monitorif_ops = {
 918         .ndo_open               = ieee80211_open,
 919         .ndo_stop               = ieee80211_stop,
 920         .ndo_uninit             = ieee80211_uninit,
 921         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 922         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 923         .ndo_set_mac_address    = ieee80211_change_mac,
 924         .ndo_select_queue       = ieee80211_monitor_select_queue,
 925 };
 926
 927 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx,
 928                                               struct net_device_path *path)
 929 {
 930         struct ieee80211_sub_if_data *sdata;
 931         struct ieee80211_local *local;
 932         struct sta_info *sta;
 933         int ret = -ENOENT;
 934
 935         sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev);
 936         local = sdata->local;
 937
 938         if (!local->ops->net_fill_forward_path)
 939                 return -EOPNOTSUPP;
 940
 941         rcu_read_lock();
 942         switch (sdata->vif.type) {
 943         case NL80211_IFTYPE_AP_VLAN:
 944                 sta = rcu_dereference(sdata->u.vlan.sta);
 945                 if (sta)
 946                         break;
 947                 if (sdata->wdev.use_4addr)
 948                         goto out;
 949                 if (is_multicast_ether_addr(ctx->daddr))
 950                         goto out;
 951                 sta = sta_info_get_bss(sdata, ctx->daddr);
 952                 break;
 953         case NL80211_IFTYPE_AP:
 954                 if (is_multicast_ether_addr(ctx->daddr))
 955                         goto out;
 956                 sta = sta_info_get(sdata, ctx->daddr);
 957                 break;
 958         case NL80211_IFTYPE_STATION:
 959                 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
 960                         sta = sta_info_get(sdata, ctx->daddr);
 961                         if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
 962                                 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
 963                                         goto out;
 964
 965                                 break;
 966                         }
 967                 }
 968
 969                 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid);
 970                 break;
 971         default:
 972                 goto out;
 973         }
 974
 975         if (!sta)
 976                 goto out;
 977
 978         ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path);
 979 out:
 980         rcu_read_unlock();
 981
 982         return ret;
 983 }
 984
 985 static const struct net_device_ops ieee80211_dataif_8023_ops = {
 986         .ndo_open               = ieee80211_open,
 987         .ndo_stop               = ieee80211_stop,
 988         .ndo_uninit             = ieee80211_uninit,
 989         .ndo_start_xmit         = ieee80211_subif_start_xmit_8023,
 990         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 991         .ndo_set_mac_address    = ieee80211_change_mac,
 992         .ndo_fill_forward_path  = ieee80211_netdev_fill_forward_path,
 993         .ndo_setup_tc           = ieee80211_netdev_setup_tc,
 994 };
 995
 996 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)
 997 {
 998         switch (iftype) {
 999         /* P2P GO and client are mapped to AP/STATION types */
1000         case NL80211_IFTYPE_AP:
1001         case NL80211_IFTYPE_STATION:
1002                 return true;
1003         default:
1004                 return false;
1005         }
1006 }
1007
1008 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
1009 {
1010         struct ieee80211_local *local = sdata->local;
1011         u32 flags;
1012
1013         flags = sdata->vif.offload_flags;
1014
1015         if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
1016             ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
1017                 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
1018
1019                 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
1020                     local->hw.wiphy->frag_threshold != (u32)-1)
1021                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
1022
1023                 if (local->virt_monitors)
1024                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
1025         } else {
1026                 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
1027         }
1028
1029         if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) &&
1030             ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
1031                 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED;
1032
1033                 if (local->virt_monitors &&
1034                     !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP))
1035                         flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
1036         } else {
1037                 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
1038         }
1039
1040         if (sdata->vif.offload_flags == flags)
1041                 return false;
1042
1043         sdata->vif.offload_flags = flags;
1044         ieee80211_check_fast_rx_iface(sdata);
1045         return true;
1046 }
1047
1048 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
1049 {
1050         struct ieee80211_local *local = sdata->local;
1051         struct ieee80211_sub_if_data *bss = sdata;
1052         bool enabled;
1053
1054         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1055                 if (!sdata->bss)
1056                         return;
1057
1058                 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1059         }
1060
1061         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
1062             !ieee80211_iftype_supports_hdr_offload(bss->vif.type))
1063                 return;
1064
1065         enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
1066         if (sdata->wdev.use_4addr &&
1067             !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
1068                 enabled = false;
1069
1070         sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
1071                                            &ieee80211_dataif_ops;
1072 }
1073
1074 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
1075 {
1076         struct ieee80211_local *local = sdata->local;
1077         struct ieee80211_sub_if_data *vsdata;
1078
1079         if (ieee80211_set_sdata_offload_flags(sdata)) {
1080                 drv_update_vif_offload(local, sdata);
1081                 ieee80211_set_vif_encap_ops(sdata);
1082         }
1083
1084         list_for_each_entry(vsdata, &local->interfaces, list) {
1085                 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
1086                     vsdata->bss != &sdata->u.ap)
1087                         continue;
1088
1089                 ieee80211_set_vif_encap_ops(vsdata);
1090         }
1091 }
1092
1093 void ieee80211_recalc_offload(struct ieee80211_local *local)
1094 {
1095         struct ieee80211_sub_if_data *sdata;
1096
1097         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
1098                 return;
1099
1100         lockdep_assert_wiphy(local->hw.wiphy);
1101
1102         list_for_each_entry(sdata, &local->interfaces, list) {
1103                 if (!ieee80211_sdata_running(sdata))
1104                         continue;
1105
1106                 ieee80211_recalc_sdata_offload(sdata);
1107         }
1108 }
1109
1110 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
1111                                     const int offset)
1112 {
1113         struct ieee80211_local *local = sdata->local;
1114         u32 flags = sdata->u.mntr.flags;
1115
1116 #define ADJUST(_f, _s)  do {                                    \
1117         if (flags & MONITOR_FLAG_##_f)                          \
1118                 local->fif_##_s += offset;                      \
1119         } while (0)
1120
1121         ADJUST(FCSFAIL, fcsfail);
1122         ADJUST(PLCPFAIL, plcpfail);
1123         ADJUST(CONTROL, control);
1124         ADJUST(CONTROL, pspoll);
1125         ADJUST(OTHER_BSS, other_bss);
1126         if (!(flags & MONITOR_FLAG_SKIP_TX))
1127                 local->tx_mntrs += offset;
1128
1129 #undef ADJUST
1130 }
1131
1132 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
1133 {
1134         struct ieee80211_local *local = sdata->local;
1135         int i;
1136
1137         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
1138                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1139                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
1140                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
1141                         sdata->vif.hw_queue[i] = i;
1142                 else
1143                         sdata->vif.hw_queue[i] = 0;
1144         }
1145         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
1146 }
1147
1148 static void ieee80211_sdata_init(struct ieee80211_local *local,
1149                                  struct ieee80211_sub_if_data *sdata)
1150 {
1151         sdata->local = local;
1152
1153         INIT_LIST_HEAD(&sdata->key_list);
1154
1155         /*
1156          * Initialize the default link, so we can use link_id 0 for non-MLD,
1157          * and that continues to work for non-MLD-aware drivers that use just
1158          * vif.bss_conf instead of vif.link_conf.
1159          *
1160          * Note that we never change this, so if link ID 0 isn't used in an
1161          * MLD connection, we get a separate allocation for it.
1162          */
1163         ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf);
1164 }
1165
1166 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
1167 {
1168         struct ieee80211_sub_if_data *sdata;
1169         int ret;
1170
1171         ASSERT_RTNL();
1172         lockdep_assert_wiphy(local->hw.wiphy);
1173
1174         if (local->monitor_sdata ||
1175             ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR))
1176                 return 0;
1177
1178         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
1179         if (!sdata)
1180                 return -ENOMEM;
1181
1182         /* set up data */
1183         sdata->vif.type = NL80211_IFTYPE_MONITOR;
1184         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
1185                  wiphy_name(local->hw.wiphy));
1186         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
1187         sdata->wdev.wiphy = local->hw.wiphy;
1188
1189         ieee80211_sdata_init(local, sdata);
1190
1191         ieee80211_set_default_queues(sdata);
1192
1193         if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF)) {
1194                 ret = drv_add_interface(local, sdata);
1195                 if (WARN_ON(ret)) {
1196                         /* ok .. stupid driver, it asked for this! */
1197                         kfree(sdata);
1198                         return ret;
1199                 }
1200         }
1201
1202         set_bit(SDATA_STATE_RUNNING, &sdata->state);
1203
1204         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
1205         if (ret) {
1206                 kfree(sdata);
1207                 return ret;
1208         }
1209
1210         mutex_lock(&local->iflist_mtx);
1211         rcu_assign_pointer(local->monitor_sdata, sdata);
1212         mutex_unlock(&local->iflist_mtx);
1213
1214         ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chanreq,
1215                                          IEEE80211_CHANCTX_EXCLUSIVE);
1216         if (ret) {
1217                 mutex_lock(&local->iflist_mtx);
1218                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
1219                 mutex_unlock(&local->iflist_mtx);
1220                 synchronize_net();
1221                 drv_remove_interface(local, sdata);
1222                 kfree(sdata);
1223                 return ret;
1224         }
1225
1226         skb_queue_head_init(&sdata->skb_queue);
1227         skb_queue_head_init(&sdata->status_queue);
1228         wiphy_work_init(&sdata->work, ieee80211_iface_work);
1229
1230         return 0;
1231 }
1232
1233 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
1234 {
1235         struct ieee80211_sub_if_data *sdata;
1236
1237         if (ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR))
1238                 return;
1239
1240         ASSERT_RTNL();
1241         lockdep_assert_wiphy(local->hw.wiphy);
1242
1243         mutex_lock(&local->iflist_mtx);
1244
1245         sdata = rcu_dereference_protected(local->monitor_sdata,
1246                                           lockdep_is_held(&local->iflist_mtx));
1247         if (!sdata) {
1248                 mutex_unlock(&local->iflist_mtx);
1249                 return;
1250         }
1251
1252         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1253         ieee80211_link_release_channel(&sdata->deflink);
1254
1255         if (ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1256                 drv_remove_interface(local, sdata);
1257
1258         RCU_INIT_POINTER(local->monitor_sdata, NULL);
1259         mutex_unlock(&local->iflist_mtx);
1260
1261         synchronize_net();
1262
1263         kfree(sdata);
1264 }
1265
1266 /*
1267  * NOTE: Be very careful when changing this function, it must NOT return
1268  * an error on interface type changes that have been pre-checked, so most
1269  * checks should be in ieee80211_check_concurrent_iface.
1270  */
1271 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1272 {
1273         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1274         struct net_device *dev = wdev->netdev;
1275         struct ieee80211_local *local = sdata->local;
1276         u64 changed = 0;
1277         int res;
1278         u32 hw_reconf_flags = 0;
1279
1280         lockdep_assert_wiphy(local->hw.wiphy);
1281
1282         switch (sdata->vif.type) {
1283         case NL80211_IFTYPE_AP_VLAN: {
1284                 struct ieee80211_sub_if_data *master;
1285
1286                 if (!sdata->bss)
1287                         return -ENOLINK;
1288
1289                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1290
1291                 master = container_of(sdata->bss,
1292                                       struct ieee80211_sub_if_data, u.ap);
1293                 sdata->control_port_protocol =
1294                         master->control_port_protocol;
1295                 sdata->control_port_no_encrypt =
1296                         master->control_port_no_encrypt;
1297                 sdata->control_port_over_nl80211 =
1298                         master->control_port_over_nl80211;
1299                 sdata->control_port_no_preauth =
1300                         master->control_port_no_preauth;
1301                 sdata->vif.cab_queue = master->vif.cab_queue;
1302                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1303                        sizeof(sdata->vif.hw_queue));
1304                 sdata->vif.bss_conf.chanreq = master->vif.bss_conf.chanreq;
1305
1306                 sdata->crypto_tx_tailroom_needed_cnt +=
1307                         master->crypto_tx_tailroom_needed_cnt;
1308
1309                 ieee80211_apvlan_link_setup(sdata);
1310
1311                 break;
1312                 }
1313         case NL80211_IFTYPE_AP:
1314                 sdata->bss = &sdata->u.ap;
1315                 break;
1316         case NL80211_IFTYPE_MESH_POINT:
1317         case NL80211_IFTYPE_STATION:
1318         case NL80211_IFTYPE_MONITOR:
1319         case NL80211_IFTYPE_ADHOC:
1320         case NL80211_IFTYPE_P2P_DEVICE:
1321         case NL80211_IFTYPE_OCB:
1322         case NL80211_IFTYPE_NAN:
1323                 /* no special treatment */
1324                 break;
1325         case NL80211_IFTYPE_UNSPECIFIED:
1326         case NUM_NL80211_IFTYPES:
1327         case NL80211_IFTYPE_P2P_CLIENT:
1328         case NL80211_IFTYPE_P2P_GO:
1329         case NL80211_IFTYPE_WDS:
1330                 /* cannot happen */
1331                 WARN_ON(1);
1332                 break;
1333         }
1334
1335         if (local->open_count == 0) {
1336                 /* here we can consider everything in good order (again) */
1337                 local->reconfig_failure = false;
1338
1339                 res = drv_start(local);
1340                 if (res)
1341                         goto err_del_bss;
1342                 ieee80211_led_radio(local, true);
1343                 ieee80211_mod_tpt_led_trig(local,
1344                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1345         }
1346
1347         /*
1348          * Copy the hopefully now-present MAC address to
1349          * this interface, if it has the special null one.
1350          */
1351         if (dev && is_zero_ether_addr(dev->dev_addr)) {
1352                 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr);
1353                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1354
1355                 if (!is_valid_ether_addr(dev->dev_addr)) {
1356                         res = -EADDRNOTAVAIL;
1357                         goto err_stop;
1358                 }
1359         }
1360
1361         sdata->vif.addr_valid = sdata->vif.type != NL80211_IFTYPE_MONITOR ||
1362                                 (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE);
1363         switch (sdata->vif.type) {
1364         case NL80211_IFTYPE_AP_VLAN:
1365                 /* no need to tell driver, but set carrier and chanctx */
1366                 if (sdata->bss->active) {
1367                         struct ieee80211_link_data *link;
1368
1369                         for_each_link_data(sdata, link) {
1370                                 ieee80211_link_vlan_copy_chanctx(link);
1371                         }
1372
1373                         netif_carrier_on(dev);
1374                         ieee80211_set_vif_encap_ops(sdata);
1375                 } else {
1376                         netif_carrier_off(dev);
1377                 }
1378                 break;
1379         case NL80211_IFTYPE_MONITOR:
1380                 if ((sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) ||
1381                     ieee80211_hw_check(&local->hw, NO_VIRTUAL_MONITOR)) {
1382                         res = drv_add_interface(local, sdata);
1383                         if (res)
1384                                 goto err_stop;
1385                 } else {
1386                         if (local->virt_monitors == 0 && local->open_count == 0) {
1387                                 res = ieee80211_add_virtual_monitor(local);
1388                                 if (res)
1389                                         goto err_stop;
1390                         }
1391                         local->virt_monitors++;
1392
1393                         /* must be before the call to ieee80211_configure_filter */
1394                         if (local->virt_monitors == 1) {
1395                                 local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1396                                 hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1397                         }
1398                 }
1399
1400                 local->monitors++;
1401
1402                 ieee80211_adjust_monitor_flags(sdata, 1);
1403                 ieee80211_configure_filter(local);
1404                 ieee80211_recalc_offload(local);
1405                 ieee80211_recalc_idle(local);
1406
1407                 netif_carrier_on(dev);
1408                 break;
1409         default:
1410                 if (coming_up) {
1411                         ieee80211_del_virtual_monitor(local);
1412                         ieee80211_set_sdata_offload_flags(sdata);
1413
1414                         res = drv_add_interface(local, sdata);
1415                         if (res)
1416                                 goto err_stop;
1417
1418                         ieee80211_set_vif_encap_ops(sdata);
1419                         res = ieee80211_check_queues(sdata,
1420                                 ieee80211_vif_type_p2p(&sdata->vif));
1421                         if (res)
1422                                 goto err_del_interface;
1423                 }
1424
1425                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1426                         local->fif_pspoll++;
1427                         local->fif_probe_req++;
1428
1429                         ieee80211_configure_filter(local);
1430                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1431                         local->fif_probe_req++;
1432                 }
1433
1434                 if (sdata->vif.probe_req_reg)
1435                         drv_config_iface_filter(local, sdata,
1436                                                 FIF_PROBE_REQ,
1437                                                 FIF_PROBE_REQ);
1438
1439                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1440                     sdata->vif.type != NL80211_IFTYPE_NAN)
1441                         changed |= ieee80211_reset_erp_info(sdata);
1442                 ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1443                                                   changed);
1444
1445                 switch (sdata->vif.type) {
1446                 case NL80211_IFTYPE_STATION:
1447                 case NL80211_IFTYPE_ADHOC:
1448                 case NL80211_IFTYPE_AP:
1449                 case NL80211_IFTYPE_MESH_POINT:
1450                 case NL80211_IFTYPE_OCB:
1451                         netif_carrier_off(dev);
1452                         break;
1453                 case NL80211_IFTYPE_P2P_DEVICE:
1454                 case NL80211_IFTYPE_NAN:
1455                         break;
1456                 default:
1457                         /* not reached */
1458                         WARN_ON(1);
1459                 }
1460
1461                 /*
1462                  * Set default queue parameters so drivers don't
1463                  * need to initialise the hardware if the hardware
1464                  * doesn't start up with sane defaults.
1465                  * Enable QoS for anything but station interfaces.
1466                  */
1467                 ieee80211_set_wmm_default(&sdata->deflink, true,
1468                         sdata->vif.type != NL80211_IFTYPE_STATION);
1469         }
1470
1471         switch (sdata->vif.type) {
1472         case NL80211_IFTYPE_P2P_DEVICE:
1473                 rcu_assign_pointer(local->p2p_sdata, sdata);
1474                 break;
1475         case NL80211_IFTYPE_MONITOR:
1476                 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1477                 break;
1478         default:
1479                 break;
1480         }
1481
1482         /*
1483          * set_multicast_list will be invoked by the networking core
1484          * which will check whether any increments here were done in
1485          * error and sync them down to the hardware as filter flags.
1486          */
1487         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1488                 atomic_inc(&local->iff_allmultis);
1489
1490         if (coming_up)
1491                 local->open_count++;
1492
1493         if (local->open_count == 1)
1494                 ieee80211_hw_conf_init(local);
1495         else if (hw_reconf_flags)
1496                 ieee80211_hw_config(local, hw_reconf_flags);
1497
1498         ieee80211_recalc_ps(local);
1499
1500         set_bit(SDATA_STATE_RUNNING, &sdata->state);
1501
1502         return 0;
1503  err_del_interface:
1504         drv_remove_interface(local, sdata);
1505  err_stop:
1506         if (!local->open_count)
1507                 drv_stop(local, false);
1508  err_del_bss:
1509         sdata->bss = NULL;
1510         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1511                 list_del(&sdata->u.vlan.list);
1512         /* might already be clear but that doesn't matter */
1513         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1514         return res;
1515 }
1516
1517 static void ieee80211_if_setup(struct net_device *dev)
1518 {
1519         ether_setup(dev);
1520         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1521         dev->priv_flags |= IFF_NO_QUEUE;
1522         dev->netdev_ops = &ieee80211_dataif_ops;
1523         dev->needs_free_netdev = true;
1524 }
1525
1526 static void ieee80211_iface_process_skb(struct ieee80211_local *local,
1527                                         struct ieee80211_sub_if_data *sdata,
1528                                         struct sk_buff *skb)
1529 {
1530         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1531
1532         lockdep_assert_wiphy(local->hw.wiphy);
1533
1534         if (ieee80211_is_action(mgmt->frame_control) &&
1535             mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1536                 struct sta_info *sta;
1537                 int len = skb->len;
1538
1539                 sta = sta_info_get_bss(sdata, mgmt->sa);
1540                 if (sta) {
1541                         switch (mgmt->u.action.u.addba_req.action_code) {
1542                         case WLAN_ACTION_ADDBA_REQ:
1543                                 ieee80211_process_addba_request(local, sta,
1544                                                                 mgmt, len);
1545                                 break;
1546                         case WLAN_ACTION_ADDBA_RESP:
1547                                 ieee80211_process_addba_resp(local, sta,
1548                                                              mgmt, len);
1549                                 break;
1550                         case WLAN_ACTION_DELBA:
1551                                 ieee80211_process_delba(sdata, sta,
1552                                                         mgmt, len);
1553                                 break;
1554                         default:
1555                                 WARN_ON(1);
1556                                 break;
1557                         }
1558                 }
1559         } else if (ieee80211_is_action(mgmt->frame_control) &&
1560                    mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1561                 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1562                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1563                         struct ieee80211_rx_status *status;
1564                         enum nl80211_band band;
1565                         struct sta_info *sta;
1566                         u8 opmode;
1567
1568                         status = IEEE80211_SKB_RXCB(skb);
1569                         band = status->band;
1570                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1571
1572                         sta = sta_info_get_bss(sdata, mgmt->sa);
1573
1574                         if (sta)
1575                                 ieee80211_vht_handle_opmode(sdata,
1576                                                             &sta->deflink,
1577                                                             opmode, band);
1578
1579                         break;
1580                 }
1581                 case WLAN_VHT_ACTION_GROUPID_MGMT:
1582                         ieee80211_process_mu_groups(sdata, &sdata->deflink,
1583                                                     mgmt);
1584                         break;
1585                 default:
1586                         WARN_ON(1);
1587                         break;
1588                 }
1589         } else if (ieee80211_is_action(mgmt->frame_control) &&
1590                    mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1591                 switch (mgmt->u.action.u.s1g.action_code) {
1592                 case WLAN_S1G_TWT_TEARDOWN:
1593                 case WLAN_S1G_TWT_SETUP:
1594                         ieee80211_s1g_rx_twt_action(sdata, skb);
1595                         break;
1596                 default:
1597                         break;
1598                 }
1599         } else if (ieee80211_is_action(mgmt->frame_control) &&
1600                    mgmt->u.action.category == WLAN_CATEGORY_PROTECTED_EHT) {
1601                 if (sdata->vif.type == NL80211_IFTYPE_STATION) {
1602                         switch (mgmt->u.action.u.ttlm_req.action_code) {
1603                         case WLAN_PROTECTED_EHT_ACTION_TTLM_REQ:
1604                                 ieee80211_process_neg_ttlm_req(sdata, mgmt,
1605                                                                skb->len);
1606                                 break;
1607                         case WLAN_PROTECTED_EHT_ACTION_TTLM_RES:
1608                                 ieee80211_process_neg_ttlm_res(sdata, mgmt,
1609                                                                skb->len);
1610                                 break;
1611                         case WLAN_PROTECTED_EHT_ACTION_TTLM_TEARDOWN:
1612                                 ieee80211_process_ttlm_teardown(sdata);
1613                                 break;
1614                         case WLAN_PROTECTED_EHT_ACTION_LINK_RECONFIG_RESP:
1615                                 ieee80211_process_ml_reconf_resp(sdata, mgmt,
1616                                                                  skb->len);
1617                                 break;
1618                         case WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_RESP:
1619                                 ieee80211_process_epcs_ena_resp(sdata, mgmt,
1620                                                                 skb->len);
1621                                 break;
1622                         case WLAN_PROTECTED_EHT_ACTION_EPCS_ENABLE_TEARDOWN:
1623                                 ieee80211_process_epcs_teardown(sdata, mgmt,
1624                                                                 skb->len);
1625                                 break;
1626                         default:
1627                                 break;
1628                         }
1629                 }
1630         } else if (ieee80211_is_ext(mgmt->frame_control)) {
1631                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1632                         ieee80211_sta_rx_queued_ext(sdata, skb);
1633                 else
1634                         WARN_ON(1);
1635         } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1636                 struct ieee80211_hdr *hdr = (void *)mgmt;
1637                 struct sta_info *sta;
1638
1639                 /*
1640                  * So the frame isn't mgmt, but frame_control
1641                  * is at the right place anyway, of course, so
1642                  * the if statement is correct.
1643                  *
1644                  * Warn if we have other data frame types here,
1645                  * they must not get here.
1646                  */
1647                 WARN_ON(hdr->frame_control &
1648                                 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1649                 WARN_ON(!(hdr->seq_ctrl &
1650                                 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1651                 /*
1652                  * This was a fragment of a frame, received while
1653                  * a block-ack session was active. That cannot be
1654                  * right, so terminate the session.
1655                  */
1656                 sta = sta_info_get_bss(sdata, mgmt->sa);
1657                 if (sta) {
1658                         u16 tid = ieee80211_get_tid(hdr);
1659
1660                         __ieee80211_stop_rx_ba_session(
1661                                 sta, tid, WLAN_BACK_RECIPIENT,
1662                                 WLAN_REASON_QSTA_REQUIRE_SETUP,
1663                                 true);
1664                 }
1665         } else switch (sdata->vif.type) {
1666         case NL80211_IFTYPE_STATION:
1667                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1668                 break;
1669         case NL80211_IFTYPE_ADHOC:
1670                 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1671                 break;
1672         case NL80211_IFTYPE_MESH_POINT:
1673                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1674                         break;
1675                 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1676                 break;
1677         default:
1678                 WARN(1, "frame for unexpected interface type");
1679                 break;
1680         }
1681 }
1682
1683 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata,
1684                                            struct sk_buff *skb)
1685 {
1686         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1687
1688         if (ieee80211_is_action(mgmt->frame_control) &&
1689             mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1690                 switch (mgmt->u.action.u.s1g.action_code) {
1691                 case WLAN_S1G_TWT_TEARDOWN:
1692                 case WLAN_S1G_TWT_SETUP:
1693                         ieee80211_s1g_status_twt_action(sdata, skb);
1694                         break;
1695                 default:
1696                         break;
1697                 }
1698         }
1699 }
1700
1701 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work)
1702 {
1703         struct ieee80211_sub_if_data *sdata =
1704                 container_of(work, struct ieee80211_sub_if_data, work);
1705         struct ieee80211_local *local = sdata->local;
1706         struct sk_buff *skb;
1707
1708         if (!ieee80211_sdata_running(sdata))
1709                 return;
1710
1711         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1712                 return;
1713
1714         if (!ieee80211_can_run_worker(local))
1715                 return;
1716
1717         /* first process frames */
1718         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1719                 kcov_remote_start_common(skb_get_kcov_handle(skb));
1720
1721                 if (skb->protocol == cpu_to_be16(ETH_P_TDLS))
1722                         ieee80211_process_tdls_channel_switch(sdata, skb);
1723                 else
1724                         ieee80211_iface_process_skb(local, sdata, skb);
1725
1726                 kfree_skb(skb);
1727                 kcov_remote_stop();
1728         }
1729
1730         /* process status queue */
1731         while ((skb = skb_dequeue(&sdata->status_queue))) {
1732                 kcov_remote_start_common(skb_get_kcov_handle(skb));
1733
1734                 ieee80211_iface_process_status(sdata, skb);
1735                 kfree_skb(skb);
1736
1737                 kcov_remote_stop();
1738         }
1739
1740         /* then other type-dependent work */
1741         switch (sdata->vif.type) {
1742         case NL80211_IFTYPE_STATION:
1743                 ieee80211_sta_work(sdata);
1744                 break;
1745         case NL80211_IFTYPE_ADHOC:
1746                 ieee80211_ibss_work(sdata);
1747                 break;
1748         case NL80211_IFTYPE_MESH_POINT:
1749                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1750                         break;
1751                 ieee80211_mesh_work(sdata);
1752                 break;
1753         case NL80211_IFTYPE_OCB:
1754                 ieee80211_ocb_work(sdata);
1755                 break;
1756         default:
1757                 break;
1758         }
1759 }
1760
1761 static void ieee80211_activate_links_work(struct wiphy *wiphy,
1762                                           struct wiphy_work *work)
1763 {
1764         struct ieee80211_sub_if_data *sdata =
1765                 container_of(work, struct ieee80211_sub_if_data,
1766                              activate_links_work);
1767         struct ieee80211_local *local = wiphy_priv(wiphy);
1768
1769         if (local->in_reconfig)
1770                 return;
1771
1772         ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links);
1773         sdata->desired_active_links = 0;
1774 }
1775
1776 /*
1777  * Helper function to initialise an interface to a specific type.
1778  */
1779 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1780                                   enum nl80211_iftype type)
1781 {
1782         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1783                                                     0xff, 0xff, 0xff};
1784
1785         /* clear type-dependent unions */
1786         memset(&sdata->u, 0, sizeof(sdata->u));
1787         memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u));
1788
1789         /* and set some type-dependent values */
1790         sdata->vif.type = type;
1791         sdata->vif.p2p = false;
1792         sdata->wdev.iftype = type;
1793
1794         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1795         sdata->control_port_no_encrypt = false;
1796         sdata->control_port_over_nl80211 = false;
1797         sdata->control_port_no_preauth = false;
1798         sdata->vif.cfg.idle = true;
1799         sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1800
1801         sdata->noack_map = 0;
1802
1803         /* only monitor/p2p-device differ */
1804         if (sdata->dev) {
1805                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1806                 sdata->dev->type = ARPHRD_ETHER;
1807         }
1808
1809         skb_queue_head_init(&sdata->skb_queue);
1810         skb_queue_head_init(&sdata->status_queue);
1811         wiphy_work_init(&sdata->work, ieee80211_iface_work);
1812         wiphy_work_init(&sdata->activate_links_work,
1813                         ieee80211_activate_links_work);
1814
1815         switch (type) {
1816         case NL80211_IFTYPE_P2P_GO:
1817                 type = NL80211_IFTYPE_AP;
1818                 sdata->vif.type = type;
1819                 sdata->vif.p2p = true;
1820                 fallthrough;
1821         case NL80211_IFTYPE_AP:
1822                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1823                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1824                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1825                 break;
1826         case NL80211_IFTYPE_P2P_CLIENT:
1827                 type = NL80211_IFTYPE_STATION;
1828                 sdata->vif.type = type;
1829                 sdata->vif.p2p = true;
1830                 fallthrough;
1831         case NL80211_IFTYPE_STATION:
1832                 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid;
1833                 ieee80211_sta_setup_sdata(sdata);
1834                 break;
1835         case NL80211_IFTYPE_OCB:
1836                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1837                 ieee80211_ocb_setup_sdata(sdata);
1838                 break;
1839         case NL80211_IFTYPE_ADHOC:
1840                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1841                 ieee80211_ibss_setup_sdata(sdata);
1842                 break;
1843         case NL80211_IFTYPE_MESH_POINT:
1844                 if (ieee80211_vif_is_mesh(&sdata->vif))
1845                         ieee80211_mesh_init_sdata(sdata);
1846                 break;
1847         case NL80211_IFTYPE_MONITOR:
1848                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1849                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1850                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1851                                       MONITOR_FLAG_OTHER_BSS;
1852                 break;
1853         case NL80211_IFTYPE_NAN:
1854                 idr_init(&sdata->u.nan.function_inst_ids);
1855                 spin_lock_init(&sdata->u.nan.func_lock);
1856                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1857                 break;
1858         case NL80211_IFTYPE_AP_VLAN:
1859         case NL80211_IFTYPE_P2P_DEVICE:
1860                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1861                 break;
1862         case NL80211_IFTYPE_UNSPECIFIED:
1863         case NL80211_IFTYPE_WDS:
1864         case NUM_NL80211_IFTYPES:
1865                 WARN_ON(1);
1866                 break;
1867         }
1868
1869         /* need to do this after the switch so vif.type is correct */
1870         ieee80211_link_setup(&sdata->deflink);
1871
1872         ieee80211_debugfs_recreate_netdev(sdata, false);
1873 }
1874
1875 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1876                                            enum nl80211_iftype type)
1877 {
1878         struct ieee80211_local *local = sdata->local;
1879         int ret, err;
1880         enum nl80211_iftype internal_type = type;
1881         bool p2p = false;
1882
1883         ASSERT_RTNL();
1884
1885         if (!local->ops->change_interface)
1886                 return -EBUSY;
1887
1888         /* for now, don't support changing while links exist */
1889         if (ieee80211_vif_is_mld(&sdata->vif))
1890                 return -EBUSY;
1891
1892         switch (sdata->vif.type) {
1893         case NL80211_IFTYPE_AP:
1894                 if (!list_empty(&sdata->u.ap.vlans))
1895                         return -EBUSY;
1896                 break;
1897         case NL80211_IFTYPE_STATION:
1898         case NL80211_IFTYPE_ADHOC:
1899         case NL80211_IFTYPE_OCB:
1900                 /*
1901                  * Could maybe also all others here?
1902                  * Just not sure how that interacts
1903                  * with the RX/config path e.g. for
1904                  * mesh.
1905                  */
1906                 break;
1907         default:
1908                 return -EBUSY;
1909         }
1910
1911         switch (type) {
1912         case NL80211_IFTYPE_AP:
1913         case NL80211_IFTYPE_STATION:
1914         case NL80211_IFTYPE_ADHOC:
1915         case NL80211_IFTYPE_OCB:
1916                 /*
1917                  * Could probably support everything
1918                  * but here.
1919                  */
1920                 break;
1921         case NL80211_IFTYPE_P2P_CLIENT:
1922                 p2p = true;
1923                 internal_type = NL80211_IFTYPE_STATION;
1924                 break;
1925         case NL80211_IFTYPE_P2P_GO:
1926                 p2p = true;
1927                 internal_type = NL80211_IFTYPE_AP;
1928                 break;
1929         default:
1930                 return -EBUSY;
1931         }
1932
1933         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1934         if (ret)
1935                 return ret;
1936
1937         ieee80211_stop_vif_queues(local, sdata,
1938                                   IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1939         /* do_stop will synchronize_rcu() first thing */
1940         ieee80211_do_stop(sdata, false);
1941
1942         ieee80211_teardown_sdata(sdata);
1943
1944         ieee80211_set_sdata_offload_flags(sdata);
1945         ret = drv_change_interface(local, sdata, internal_type, p2p);
1946         if (ret)
1947                 type = ieee80211_vif_type_p2p(&sdata->vif);
1948
1949         /*
1950          * Ignore return value here, there's not much we can do since
1951          * the driver changed the interface type internally already.
1952          * The warnings will hopefully make driver authors fix it :-)
1953          */
1954         ieee80211_check_queues(sdata, type);
1955
1956         ieee80211_setup_sdata(sdata, type);
1957         ieee80211_set_vif_encap_ops(sdata);
1958
1959         err = ieee80211_do_open(&sdata->wdev, false);
1960         WARN(err, "type change: do_open returned %d", err);
1961
1962         ieee80211_wake_vif_queues(local, sdata,
1963                                   IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1964         return ret;
1965 }
1966
1967 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1968                              enum nl80211_iftype type)
1969 {
1970         int ret;
1971
1972         ASSERT_RTNL();
1973
1974         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1975                 return 0;
1976
1977         if (ieee80211_sdata_running(sdata)) {
1978                 ret = ieee80211_runtime_change_iftype(sdata, type);
1979                 if (ret)
1980                         return ret;
1981         } else {
1982                 /* Purge and reset type-dependent state. */
1983                 ieee80211_teardown_sdata(sdata);
1984                 ieee80211_setup_sdata(sdata, type);
1985         }
1986
1987         /* reset some values that shouldn't be kept across type changes */
1988         if (type == NL80211_IFTYPE_STATION)
1989                 sdata->u.mgd.use_4addr = false;
1990
1991         return 0;
1992 }
1993
1994 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1995                                        u8 *perm_addr, enum nl80211_iftype type)
1996 {
1997         struct ieee80211_sub_if_data *sdata;
1998         u64 mask, start, addr, val, inc;
1999         u8 *m;
2000         u8 tmp_addr[ETH_ALEN];
2001         int i;
2002
2003         lockdep_assert_wiphy(local->hw.wiphy);
2004
2005         /* default ... something at least */
2006         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
2007
2008         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
2009             local->hw.wiphy->n_addresses <= 1)
2010                 return;
2011
2012         switch (type) {
2013         case NL80211_IFTYPE_MONITOR:
2014                 /* doesn't matter */
2015                 break;
2016         case NL80211_IFTYPE_AP_VLAN:
2017                 /* match up with an AP interface */
2018                 list_for_each_entry(sdata, &local->interfaces, list) {
2019                         if (sdata->vif.type != NL80211_IFTYPE_AP)
2020                                 continue;
2021                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
2022                         break;
2023                 }
2024                 /* keep default if no AP interface present */
2025                 break;
2026         case NL80211_IFTYPE_P2P_CLIENT:
2027         case NL80211_IFTYPE_P2P_GO:
2028                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
2029                         list_for_each_entry(sdata, &local->interfaces, list) {
2030                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
2031                                         continue;
2032                                 if (!ieee80211_sdata_running(sdata))
2033                                         continue;
2034                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
2035                                 return;
2036                         }
2037                 }
2038                 fallthrough;
2039         default:
2040                 /* assign a new address if possible -- try n_addresses first */
2041                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
2042                         bool used = false;
2043
2044                         list_for_each_entry(sdata, &local->interfaces, list) {
2045                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
2046                                                      sdata->vif.addr)) {
2047                                         used = true;
2048                                         break;
2049                                 }
2050                         }
2051
2052                         if (!used) {
2053                                 memcpy(perm_addr,
2054                                        local->hw.wiphy->addresses[i].addr,
2055                                        ETH_ALEN);
2056                                 break;
2057                         }
2058                 }
2059
2060                 /* try mask if available */
2061                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
2062                         break;
2063
2064                 m = local->hw.wiphy->addr_mask;
2065                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
2066                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
2067                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
2068
2069                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
2070                         /* not a contiguous mask ... not handled now! */
2071                         pr_info("not contiguous\n");
2072                         break;
2073                 }
2074
2075                 /*
2076                  * Pick address of existing interface in case user changed
2077                  * MAC address manually, default to perm_addr.
2078                  */
2079                 m = local->hw.wiphy->perm_addr;
2080                 list_for_each_entry(sdata, &local->interfaces, list) {
2081                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
2082                                 continue;
2083                         m = sdata->vif.addr;
2084                         break;
2085                 }
2086                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
2087                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
2088                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
2089
2090                 inc = 1ULL<<__ffs64(mask);
2091                 val = (start & mask);
2092                 addr = (start & ~mask) | (val & mask);
2093                 do {
2094                         bool used = false;
2095
2096                         tmp_addr[5] = addr >> 0*8;
2097                         tmp_addr[4] = addr >> 1*8;
2098                         tmp_addr[3] = addr >> 2*8;
2099                         tmp_addr[2] = addr >> 3*8;
2100                         tmp_addr[1] = addr >> 4*8;
2101                         tmp_addr[0] = addr >> 5*8;
2102
2103                         val += inc;
2104
2105                         list_for_each_entry(sdata, &local->interfaces, list) {
2106                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
2107                                         used = true;
2108                                         break;
2109                                 }
2110                         }
2111
2112                         if (!used) {
2113                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
2114                                 break;
2115                         }
2116                         addr = (start & ~mask) | (val & mask);
2117                 } while (addr != start);
2118
2119                 break;
2120         }
2121 }
2122
2123 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
2124                      unsigned char name_assign_type,
2125                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
2126                      struct vif_params *params)
2127 {
2128         struct net_device *ndev = NULL;
2129         struct ieee80211_sub_if_data *sdata = NULL;
2130         struct txq_info *txqi;
2131         int ret, i;
2132
2133         ASSERT_RTNL();
2134         lockdep_assert_wiphy(local->hw.wiphy);
2135
2136         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
2137                 struct wireless_dev *wdev;
2138
2139                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
2140                                 GFP_KERNEL);
2141                 if (!sdata)
2142                         return -ENOMEM;
2143                 wdev = &sdata->wdev;
2144
2145                 sdata->dev = NULL;
2146                 strscpy(sdata->name, name, IFNAMSIZ);
2147                 ieee80211_assign_perm_addr(local, wdev->address, type);
2148                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
2149                 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
2150         } else {
2151                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
2152                                  sizeof(void *));
2153                 int txq_size = 0;
2154
2155                 if (type != NL80211_IFTYPE_AP_VLAN &&
2156                     (type != NL80211_IFTYPE_MONITOR ||
2157                      (params->flags & MONITOR_FLAG_ACTIVE)))
2158                         txq_size += sizeof(struct txq_info) +
2159                                     local->hw.txq_data_size;
2160
2161                 ndev = alloc_netdev_mqs(size + txq_size,
2162                                         name, name_assign_type,
2163                                         ieee80211_if_setup, 1, 1);
2164                 if (!ndev)
2165                         return -ENOMEM;
2166
2167                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
2168
2169                 ndev->pcpu_stat_type = NETDEV_PCPU_STAT_TSTATS;
2170
2171                 ndev->needed_headroom = local->tx_headroom +
2172                                         4*6 /* four MAC addresses */
2173                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
2174                                         + 6 /* mesh */
2175                                         + 8 /* rfc1042/bridge tunnel */
2176                                         - ETH_HLEN /* ethernet hard_header_len */
2177                                         + IEEE80211_ENCRYPT_HEADROOM;
2178                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
2179
2180                 ret = dev_alloc_name(ndev, ndev->name);
2181                 if (ret < 0) {
2182                         free_netdev(ndev);
2183                         return ret;
2184                 }
2185
2186                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
2187                 if (is_valid_ether_addr(params->macaddr))
2188                         eth_hw_addr_set(ndev, params->macaddr);
2189                 else
2190                         eth_hw_addr_set(ndev, ndev->perm_addr);
2191                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
2192
2193                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
2194                 sdata = netdev_priv(ndev);
2195                 ndev->ieee80211_ptr = &sdata->wdev;
2196                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
2197                 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
2198                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
2199
2200                 if (txq_size) {
2201                         txqi = netdev_priv(ndev) + size;
2202                         ieee80211_txq_init(sdata, NULL, txqi, 0);
2203                 }
2204
2205                 sdata->dev = ndev;
2206         }
2207
2208         /* initialise type-independent data */
2209         sdata->wdev.wiphy = local->hw.wiphy;
2210
2211         ieee80211_sdata_init(local, sdata);
2212
2213         ieee80211_init_frag_cache(&sdata->frags);
2214
2215         wiphy_delayed_work_init(&sdata->dec_tailroom_needed_wk,
2216                                 ieee80211_delayed_tailroom_dec);
2217
2218         for (i = 0; i < NUM_NL80211_BANDS; i++) {
2219                 struct ieee80211_supported_band *sband;
2220                 sband = local->hw.wiphy->bands[i];
2221                 sdata->rc_rateidx_mask[i] =
2222                         sband ? (1 << sband->n_bitrates) - 1 : 0;
2223                 if (sband) {
2224                         __le16 cap;
2225                         u16 *vht_rate_mask;
2226
2227                         memcpy(sdata->rc_rateidx_mcs_mask[i],
2228                                sband->ht_cap.mcs.rx_mask,
2229                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
2230
2231                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
2232                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
2233                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
2234                 } else {
2235                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
2236                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
2237                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
2238                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
2239                 }
2240         }
2241
2242         ieee80211_set_default_queues(sdata);
2243
2244         /* setup type-dependent data */
2245         ieee80211_setup_sdata(sdata, type);
2246
2247         if (ndev) {
2248                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
2249                 if (type == NL80211_IFTYPE_STATION)
2250                         sdata->u.mgd.use_4addr = params->use_4addr;
2251
2252                 ndev->features |= local->hw.netdev_features;
2253                 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2254                 ndev->hw_features |= ndev->features &
2255                                         MAC80211_SUPPORTED_FEATURES_TX;
2256                 sdata->vif.netdev_features = local->hw.netdev_features;
2257
2258                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
2259
2260                 /* MTU range is normally 256 - 2304, where the upper limit is
2261                  * the maximum MSDU size. Monitor interfaces send and receive
2262                  * MPDU and A-MSDU frames which may be much larger so we do
2263                  * not impose an upper limit in that case.
2264                  */
2265                 ndev->min_mtu = 256;
2266                 if (type == NL80211_IFTYPE_MONITOR)
2267                         ndev->max_mtu = 0;
2268                 else
2269                         ndev->max_mtu = local->hw.max_mtu;
2270
2271                 ret = cfg80211_register_netdevice(ndev);
2272                 if (ret) {
2273                         free_netdev(ndev);
2274                         return ret;
2275                 }
2276         }
2277
2278         mutex_lock(&local->iflist_mtx);
2279         list_add_tail_rcu(&sdata->list, &local->interfaces);
2280         mutex_unlock(&local->iflist_mtx);
2281
2282         if (new_wdev)
2283                 *new_wdev = &sdata->wdev;
2284
2285         return 0;
2286 }
2287
2288 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2289 {
2290         ASSERT_RTNL();
2291         lockdep_assert_wiphy(sdata->local->hw.wiphy);
2292
2293         mutex_lock(&sdata->local->iflist_mtx);
2294         list_del_rcu(&sdata->list);
2295         mutex_unlock(&sdata->local->iflist_mtx);
2296
2297         if (sdata->vif.txq)
2298                 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2299
2300         synchronize_rcu();
2301
2302         cfg80211_unregister_wdev(&sdata->wdev);
2303
2304         if (!sdata->dev) {
2305                 ieee80211_teardown_sdata(sdata);
2306                 kfree(sdata);
2307         }
2308 }
2309
2310 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2311 {
2312         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2313                 return;
2314         ieee80211_do_stop(sdata, true);
2315 }
2316
2317 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2318 {
2319         struct ieee80211_sub_if_data *sdata, *tmp;
2320         LIST_HEAD(unreg_list);
2321
2322         ASSERT_RTNL();
2323
2324         /* Before destroying the interfaces, make sure they're all stopped so
2325          * that the hardware is stopped. Otherwise, the driver might still be
2326          * iterating the interfaces during the shutdown, e.g. from a worker
2327          * or from RX processing or similar, and if it does so (using atomic
2328          * iteration) while we're manipulating the list, the iteration will
2329          * crash.
2330          *
2331          * After this, the hardware should be stopped and the driver should
2332          * have stopped all of its activities, so that we can do RCU-unaware
2333          * manipulations of the interface list below.
2334          */
2335         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2336
2337         guard(wiphy)(local->hw.wiphy);
2338
2339         WARN(local->open_count, "%s: open count remains %d\n",
2340              wiphy_name(local->hw.wiphy), local->open_count);
2341
2342         mutex_lock(&local->iflist_mtx);
2343         list_splice_init(&local->interfaces, &unreg_list);
2344         mutex_unlock(&local->iflist_mtx);
2345
2346         list_for_each_entry_safe(sdata, tmp, &unreg_list, list) {
2347                 bool netdev = sdata->dev;
2348
2349                 /*
2350                  * Remove IP addresses explicitly, since the notifier will
2351                  * skip the callbacks if wdev->registered is false, since
2352                  * we can't acquire the wiphy_lock() again there if already
2353                  * inside this locked section.
2354                  */
2355                 sdata->vif.cfg.arp_addr_cnt = 0;
2356                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2357                     sdata->u.mgd.associated)
2358                         ieee80211_vif_cfg_change_notify(sdata,
2359                                                         BSS_CHANGED_ARP_FILTER);
2360
2361                 list_del(&sdata->list);
2362                 cfg80211_unregister_wdev(&sdata->wdev);
2363
2364                 if (!netdev)
2365                         kfree(sdata);
2366         }
2367 }
2368
2369 static int netdev_notify(struct notifier_block *nb,
2370                          unsigned long state, void *ptr)
2371 {
2372         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2373         struct ieee80211_sub_if_data *sdata;
2374
2375         if (state != NETDEV_CHANGENAME)
2376                 return NOTIFY_DONE;
2377
2378         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2379                 return NOTIFY_DONE;
2380
2381         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2382                 return NOTIFY_DONE;
2383
2384         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2385         memcpy(sdata->name, dev->name, IFNAMSIZ);
2386         ieee80211_debugfs_rename_netdev(sdata);
2387
2388         return NOTIFY_OK;
2389 }
2390
2391 static struct notifier_block mac80211_netdev_notifier = {
2392         .notifier_call = netdev_notify,
2393 };
2394
2395 int ieee80211_iface_init(void)
2396 {
2397         return register_netdevice_notifier(&mac80211_netdev_notifier);
2398 }
2399
2400 void ieee80211_iface_exit(void)
2401 {
2402         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2403 }
2404
2405 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2406 {
2407         if (sdata->vif.type == NL80211_IFTYPE_AP)
2408                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2409         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2410                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2411 }
2412
2413 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2414 {
2415         if (sdata->vif.type == NL80211_IFTYPE_AP)
2416                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2417         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2418                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2419 }
2420
2421 void ieee80211_vif_block_queues_csa(struct ieee80211_sub_if_data *sdata)
2422 {
2423         struct ieee80211_local *local = sdata->local;
2424
2425         if (ieee80211_hw_check(&local->hw, HANDLES_QUIET_CSA))
2426                 return;
2427
2428         ieee80211_stop_vif_queues_norefcount(local, sdata,
2429                                              IEEE80211_QUEUE_STOP_REASON_CSA);
2430 }
2431
2432 void ieee80211_vif_unblock_queues_csa(struct ieee80211_sub_if_data *sdata)
2433 {
2434         struct ieee80211_local *local = sdata->local;
2435
2436         ieee80211_wake_vif_queues_norefcount(local, sdata,
2437                                              IEEE80211_QUEUE_STOP_REASON_CSA);
2438 }