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