net/mac80211/iface.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Interface handling
   4  *
   5  * Copyright 2002-2005, Instant802 Networks, Inc.
   6  * Copyright 2005-2006, Devicescape Software, Inc.
   7  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   8  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   9  * Copyright 2013-2014  Intel Mobile Communications GmbH
  10  * Copyright (c) 2016        Intel Deutschland GmbH
  11  * Copyright (C) 2018-2021 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.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->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  64                 power = min(power, sdata->user_power_level);
  65
  66         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  67                 power = min(power, sdata->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_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  84 }
  85
  86 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
  87 {
  88         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  89                 return 0;
  90
  91         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  92         return IEEE80211_CONF_CHANGE_IDLE;
  93 }
  94
  95 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  96 {
  97         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  98                 return 0;
  99
 100         ieee80211_flush_queues(local, NULL, false);
 101
 102         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 103         return IEEE80211_CONF_CHANGE_IDLE;
 104 }
 105
 106 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
 107                                    bool force_active)
 108 {
 109         bool working, scanning, active;
 110         unsigned int led_trig_start = 0, led_trig_stop = 0;
 111
 112         lockdep_assert_held(&local->mtx);
 113
 114         active = force_active ||
 115                  !list_empty(&local->chanctx_list) ||
 116                  local->monitors;
 117
 118         working = !local->ops->remain_on_channel &&
 119                   !list_empty(&local->roc_list);
 120
 121         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 122                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 123
 124         if (working || scanning)
 125                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 126         else
 127                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 128
 129         if (active)
 130                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 131         else
 132                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 133
 134         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 135
 136         if (working || scanning || active)
 137                 return __ieee80211_idle_off(local);
 138         return __ieee80211_idle_on(local);
 139 }
 140
 141 u32 ieee80211_idle_off(struct ieee80211_local *local)
 142 {
 143         return __ieee80211_recalc_idle(local, true);
 144 }
 145
 146 void ieee80211_recalc_idle(struct ieee80211_local *local)
 147 {
 148         u32 change = __ieee80211_recalc_idle(local, false);
 149         if (change)
 150                 ieee80211_hw_config(local, change);
 151 }
 152
 153 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 154                                 bool check_dup)
 155 {
 156         struct ieee80211_local *local = sdata->local;
 157         struct ieee80211_sub_if_data *iter;
 158         u64 new, mask, tmp;
 159         u8 *m;
 160         int ret = 0;
 161
 162         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 163                 return 0;
 164
 165         m = addr;
 166         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 167                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 168                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 169
 170         m = local->hw.wiphy->addr_mask;
 171         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 172                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 173                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 174
 175         if (!check_dup)
 176                 return ret;
 177
 178         mutex_lock(&local->iflist_mtx);
 179         list_for_each_entry(iter, &local->interfaces, list) {
 180                 if (iter == sdata)
 181                         continue;
 182
 183                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 184                     !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 185                         continue;
 186
 187                 m = iter->vif.addr;
 188                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 189                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 190                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 191
 192                 if ((new & ~mask) != (tmp & ~mask)) {
 193                         ret = -EINVAL;
 194                         break;
 195                 }
 196         }
 197         mutex_unlock(&local->iflist_mtx);
 198
 199         return ret;
 200 }
 201
 202 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 203 {
 204         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 205         struct sockaddr *sa = addr;
 206         bool check_dup = true;
 207         int ret;
 208
 209         if (ieee80211_sdata_running(sdata))
 210                 return -EBUSY;
 211
 212         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 213             !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 214                 check_dup = false;
 215
 216         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 217         if (ret)
 218                 return ret;
 219
 220         ret = eth_mac_addr(dev, sa);
 221
 222         if (ret == 0)
 223                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 224
 225         return ret;
 226 }
 227
 228 static inline int identical_mac_addr_allowed(int type1, int type2)
 229 {
 230         return type1 == NL80211_IFTYPE_MONITOR ||
 231                 type2 == NL80211_IFTYPE_MONITOR ||
 232                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 233                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 234                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 235                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 236                         (type2 == NL80211_IFTYPE_AP ||
 237                          type2 == NL80211_IFTYPE_AP_VLAN));
 238 }
 239
 240 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 241                                             enum nl80211_iftype iftype)
 242 {
 243         struct ieee80211_local *local = sdata->local;
 244         struct ieee80211_sub_if_data *nsdata;
 245         int ret;
 246
 247         ASSERT_RTNL();
 248
 249         /* we hold the RTNL here so can safely walk the list */
 250         list_for_each_entry(nsdata, &local->interfaces, list) {
 251                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 252                         /*
 253                          * Only OCB and monitor mode may coexist
 254                          */
 255                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
 256                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
 257                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 258                              nsdata->vif.type == NL80211_IFTYPE_OCB))
 259                                 return -EBUSY;
 260
 261                         /*
 262                          * Allow only a single IBSS interface to be up at any
 263                          * time. This is restricted because beacon distribution
 264                          * cannot work properly if both are in the same IBSS.
 265                          *
 266                          * To remove this restriction we'd have to disallow them
 267                          * from setting the same SSID on different IBSS interfaces
 268                          * belonging to the same hardware. Then, however, we're
 269                          * faced with having to adopt two different TSF timers...
 270                          */
 271                         if (iftype == NL80211_IFTYPE_ADHOC &&
 272                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 273                                 return -EBUSY;
 274                         /*
 275                          * will not add another interface while any channel
 276                          * switch is active.
 277                          */
 278                         if (nsdata->vif.csa_active)
 279                                 return -EBUSY;
 280
 281                         /*
 282                          * The remaining checks are only performed for interfaces
 283                          * with the same MAC address.
 284                          */
 285                         if (!ether_addr_equal(sdata->vif.addr,
 286                                               nsdata->vif.addr))
 287                                 continue;
 288
 289                         /*
 290                          * check whether it may have the same address
 291                          */
 292                         if (!identical_mac_addr_allowed(iftype,
 293                                                         nsdata->vif.type))
 294                                 return -ENOTUNIQ;
 295
 296                         /*
 297                          * can only add VLANs to enabled APs
 298                          */
 299                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 300                             nsdata->vif.type == NL80211_IFTYPE_AP)
 301                                 sdata->bss = &nsdata->u.ap;
 302                 }
 303         }
 304
 305         mutex_lock(&local->chanctx_mtx);
 306         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
 307         mutex_unlock(&local->chanctx_mtx);
 308         return ret;
 309 }
 310
 311 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 312                                   enum nl80211_iftype iftype)
 313 {
 314         int n_queues = sdata->local->hw.queues;
 315         int i;
 316
 317         if (iftype == NL80211_IFTYPE_NAN)
 318                 return 0;
 319
 320         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 321                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 322                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 323                                          IEEE80211_INVAL_HW_QUEUE))
 324                                 return -EINVAL;
 325                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 326                                          n_queues))
 327                                 return -EINVAL;
 328                 }
 329         }
 330
 331         if ((iftype != NL80211_IFTYPE_AP &&
 332              iftype != NL80211_IFTYPE_P2P_GO &&
 333              iftype != NL80211_IFTYPE_MESH_POINT) ||
 334             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
 335                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 336                 return 0;
 337         }
 338
 339         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 340                 return -EINVAL;
 341
 342         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 343                 return -EINVAL;
 344
 345         return 0;
 346 }
 347
 348 static int ieee80211_open(struct net_device *dev)
 349 {
 350         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 351         int err;
 352
 353         /* fail early if user set an invalid address */
 354         if (!is_valid_ether_addr(dev->dev_addr))
 355                 return -EADDRNOTAVAIL;
 356
 357         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 358         if (err)
 359                 return err;
 360
 361         wiphy_lock(sdata->local->hw.wiphy);
 362         err = ieee80211_do_open(&sdata->wdev, true);
 363         wiphy_unlock(sdata->local->hw.wiphy);
 364
 365         return err;
 366 }
 367
 368 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down)
 369 {
 370         struct ieee80211_local *local = sdata->local;
 371         unsigned long flags;
 372         struct sk_buff *skb, *tmp;
 373         u32 hw_reconf_flags = 0;
 374         int i, flushed;
 375         struct ps_data *ps;
 376         struct cfg80211_chan_def chandef;
 377         bool cancel_scan;
 378         struct cfg80211_nan_func *func;
 379
 380         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 381         synchronize_rcu(); /* flush _ieee80211_wake_txqs() */
 382
 383         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 384         if (cancel_scan)
 385                 ieee80211_scan_cancel(local);
 386
 387         /*
 388          * Stop TX on this interface first.
 389          */
 390         if (sdata->dev)
 391                 netif_tx_stop_all_queues(sdata->dev);
 392
 393         ieee80211_roc_purge(local, sdata);
 394
 395         switch (sdata->vif.type) {
 396         case NL80211_IFTYPE_STATION:
 397                 ieee80211_mgd_stop(sdata);
 398                 break;
 399         case NL80211_IFTYPE_ADHOC:
 400                 ieee80211_ibss_stop(sdata);
 401                 break;
 402         case NL80211_IFTYPE_MONITOR:
 403                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
 404                         break;
 405                 list_del_rcu(&sdata->u.mntr.list);
 406                 break;
 407         default:
 408                 break;
 409         }
 410
 411         /*
 412          * Remove all stations associated with this interface.
 413          *
 414          * This must be done before calling ops->remove_interface()
 415          * because otherwise we can later invoke ops->sta_notify()
 416          * whenever the STAs are removed, and that invalidates driver
 417          * assumptions about always getting a vif pointer that is valid
 418          * (because if we remove a STA after ops->remove_interface()
 419          * the driver will have removed the vif info already!)
 420          *
 421          * For AP_VLANs stations may exist since there's nothing else that
 422          * would have removed them, but in other modes there shouldn't
 423          * be any stations.
 424          */
 425         flushed = sta_info_flush(sdata);
 426         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0);
 427
 428         /* don't count this interface for allmulti while it is down */
 429         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 430                 atomic_dec(&local->iff_allmultis);
 431
 432         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 433                 local->fif_pspoll--;
 434                 local->fif_probe_req--;
 435         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 436                 local->fif_probe_req--;
 437         }
 438
 439         if (sdata->dev) {
 440                 netif_addr_lock_bh(sdata->dev);
 441                 spin_lock_bh(&local->filter_lock);
 442                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 443                                  sdata->dev->addr_len);
 444                 spin_unlock_bh(&local->filter_lock);
 445                 netif_addr_unlock_bh(sdata->dev);
 446         }
 447
 448         del_timer_sync(&local->dynamic_ps_timer);
 449         cancel_work_sync(&local->dynamic_ps_enable_work);
 450
 451         cancel_work_sync(&sdata->recalc_smps);
 452         sdata_lock(sdata);
 453         mutex_lock(&local->mtx);
 454         sdata->vif.csa_active = false;
 455         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 456                 sdata->u.mgd.csa_waiting_bcn = false;
 457         if (sdata->csa_block_tx) {
 458                 ieee80211_wake_vif_queues(local, sdata,
 459                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 460                 sdata->csa_block_tx = false;
 461         }
 462         mutex_unlock(&local->mtx);
 463         sdata_unlock(sdata);
 464
 465         cancel_work_sync(&sdata->csa_finalize_work);
 466         cancel_work_sync(&sdata->color_change_finalize_work);
 467
 468         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 469
 470         if (sdata->wdev.cac_started) {
 471                 chandef = sdata->vif.bss_conf.chandef;
 472                 WARN_ON(local->suspended);
 473                 mutex_lock(&local->mtx);
 474                 ieee80211_vif_release_channel(sdata);
 475                 mutex_unlock(&local->mtx);
 476                 cfg80211_cac_event(sdata->dev, &chandef,
 477                                    NL80211_RADAR_CAC_ABORTED,
 478                                    GFP_KERNEL);
 479         }
 480
 481         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 482                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 483         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 484                 /* remove all packets in parent bc_buf pointing to this dev */
 485                 ps = &sdata->bss->ps;
 486
 487                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 488                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 489                         if (skb->dev == sdata->dev) {
 490                                 __skb_unlink(skb, &ps->bc_buf);
 491                                 local->total_ps_buffered--;
 492                                 ieee80211_free_txskb(&local->hw, skb);
 493                         }
 494                 }
 495                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 496         }
 497
 498         if (going_down)
 499                 local->open_count--;
 500
 501         switch (sdata->vif.type) {
 502         case NL80211_IFTYPE_AP_VLAN:
 503                 mutex_lock(&local->mtx);
 504                 list_del(&sdata->u.vlan.list);
 505                 mutex_unlock(&local->mtx);
 506                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 507                 /* see comment in the default case below */
 508                 ieee80211_free_keys(sdata, true);
 509                 /* no need to tell driver */
 510                 break;
 511         case NL80211_IFTYPE_MONITOR:
 512                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 513                         local->cooked_mntrs--;
 514                         break;
 515                 }
 516
 517                 local->monitors--;
 518                 if (local->monitors == 0) {
 519                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 520                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 521                 }
 522
 523                 ieee80211_adjust_monitor_flags(sdata, -1);
 524                 break;
 525         case NL80211_IFTYPE_NAN:
 526                 /* clean all the functions */
 527                 spin_lock_bh(&sdata->u.nan.func_lock);
 528
 529                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
 530                         idr_remove(&sdata->u.nan.function_inst_ids, i);
 531                         cfg80211_free_nan_func(func);
 532                 }
 533                 idr_destroy(&sdata->u.nan.function_inst_ids);
 534
 535                 spin_unlock_bh(&sdata->u.nan.func_lock);
 536                 break;
 537         case NL80211_IFTYPE_P2P_DEVICE:
 538                 /* relies on synchronize_rcu() below */
 539                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 540                 fallthrough;
 541         default:
 542                 cancel_work_sync(&sdata->work);
 543                 /*
 544                  * When we get here, the interface is marked down.
 545                  * Free the remaining keys, if there are any
 546                  * (which can happen in AP mode if userspace sets
 547                  * keys before the interface is operating)
 548                  *
 549                  * Force the key freeing to always synchronize_net()
 550                  * to wait for the RX path in case it is using this
 551                  * interface enqueuing frames at this very time on
 552                  * another CPU.
 553                  */
 554                 ieee80211_free_keys(sdata, true);
 555                 skb_queue_purge(&sdata->skb_queue);
 556                 skb_queue_purge(&sdata->status_queue);
 557         }
 558
 559         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 560         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 561                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 562                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 563                         if (info->control.vif == &sdata->vif) {
 564                                 __skb_unlink(skb, &local->pending[i]);
 565                                 ieee80211_free_txskb(&local->hw, skb);
 566                         }
 567                 }
 568         }
 569         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 570
 571         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 572                 ieee80211_txq_remove_vlan(local, sdata);
 573
 574         sdata->bss = NULL;
 575
 576         if (local->open_count == 0)
 577                 ieee80211_clear_tx_pending(local);
 578
 579         sdata->vif.bss_conf.beacon_int = 0;
 580
 581         /*
 582          * If the interface goes down while suspended, presumably because
 583          * the device was unplugged and that happens before our resume,
 584          * then the driver is already unconfigured and the remainder of
 585          * this function isn't needed.
 586          * XXX: what about WoWLAN? If the device has software state, e.g.
 587          *      memory allocated, it might expect teardown commands from
 588          *      mac80211 here?
 589          */
 590         if (local->suspended) {
 591                 WARN_ON(local->wowlan);
 592                 WARN_ON(rcu_access_pointer(local->monitor_sdata));
 593                 return;
 594         }
 595
 596         switch (sdata->vif.type) {
 597         case NL80211_IFTYPE_AP_VLAN:
 598                 break;
 599         case NL80211_IFTYPE_MONITOR:
 600                 if (local->monitors == 0)
 601                         ieee80211_del_virtual_monitor(local);
 602
 603                 mutex_lock(&local->mtx);
 604                 ieee80211_recalc_idle(local);
 605                 mutex_unlock(&local->mtx);
 606
 607                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 608                         break;
 609
 610                 fallthrough;
 611         default:
 612                 if (going_down)
 613                         drv_remove_interface(local, sdata);
 614         }
 615
 616         ieee80211_recalc_ps(local);
 617
 618         if (cancel_scan)
 619                 flush_delayed_work(&local->scan_work);
 620
 621         if (local->open_count == 0) {
 622                 ieee80211_stop_device(local);
 623
 624                 /* no reconfiguring after stop! */
 625                 return;
 626         }
 627
 628         /* do after stop to avoid reconfiguring when we stop anyway */
 629         ieee80211_configure_filter(local);
 630         ieee80211_hw_config(local, hw_reconf_flags);
 631
 632         if (local->monitors == local->open_count)
 633                 ieee80211_add_virtual_monitor(local);
 634 }
 635
 636 static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata)
 637 {
 638         struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata;
 639         struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif;
 640
 641         if (!tx_vif)
 642                 return;
 643
 644         tx_sdata = vif_to_sdata(tx_vif);
 645         sdata->vif.mbssid_tx_vif = NULL;
 646
 647         list_for_each_entry_safe(non_tx_sdata, tmp_sdata,
 648                                  &tx_sdata->local->interfaces, list) {
 649                 if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata &&
 650                     non_tx_sdata->vif.mbssid_tx_vif == tx_vif &&
 651                     ieee80211_sdata_running(non_tx_sdata)) {
 652                         non_tx_sdata->vif.mbssid_tx_vif = NULL;
 653                         dev_close(non_tx_sdata->wdev.netdev);
 654                 }
 655         }
 656
 657         if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) {
 658                 tx_sdata->vif.mbssid_tx_vif = NULL;
 659                 dev_close(tx_sdata->wdev.netdev);
 660         }
 661 }
 662
 663 static int ieee80211_stop(struct net_device *dev)
 664 {
 665         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 666
 667         /* close dependent VLAN and MBSSID interfaces before locking wiphy */
 668         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 669                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 670
 671                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 672                                          u.vlan.list)
 673                         dev_close(vlan->dev);
 674
 675                 ieee80211_stop_mbssid(sdata);
 676         }
 677
 678         wiphy_lock(sdata->local->hw.wiphy);
 679         ieee80211_do_stop(sdata, true);
 680         wiphy_unlock(sdata->local->hw.wiphy);
 681
 682         return 0;
 683 }
 684
 685 static void ieee80211_set_multicast_list(struct net_device *dev)
 686 {
 687         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 688         struct ieee80211_local *local = sdata->local;
 689         int allmulti, sdata_allmulti;
 690
 691         allmulti = !!(dev->flags & IFF_ALLMULTI);
 692         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 693
 694         if (allmulti != sdata_allmulti) {
 695                 if (dev->flags & IFF_ALLMULTI)
 696                         atomic_inc(&local->iff_allmultis);
 697                 else
 698                         atomic_dec(&local->iff_allmultis);
 699                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 700         }
 701
 702         spin_lock_bh(&local->filter_lock);
 703         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 704         spin_unlock_bh(&local->filter_lock);
 705         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 706 }
 707
 708 /*
 709  * Called when the netdev is removed or, by the code below, before
 710  * the interface type changes.
 711  */
 712 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 713 {
 714         /* free extra data */
 715         ieee80211_free_keys(sdata, false);
 716
 717         ieee80211_debugfs_remove_netdev(sdata);
 718
 719         ieee80211_destroy_frag_cache(&sdata->frags);
 720
 721         if (ieee80211_vif_is_mesh(&sdata->vif))
 722                 ieee80211_mesh_teardown_sdata(sdata);
 723 }
 724
 725 static void ieee80211_uninit(struct net_device *dev)
 726 {
 727         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
 728 }
 729
 730 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 731                                          struct sk_buff *skb,
 732                                          struct net_device *sb_dev)
 733 {
 734         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 735 }
 736
 737 static void
 738 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 739 {
 740         dev_fetch_sw_netstats(stats, dev->tstats);
 741 }
 742
 743 static const struct net_device_ops ieee80211_dataif_ops = {
 744         .ndo_open               = ieee80211_open,
 745         .ndo_stop               = ieee80211_stop,
 746         .ndo_uninit             = ieee80211_uninit,
 747         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 748         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 749         .ndo_set_mac_address    = ieee80211_change_mac,
 750         .ndo_select_queue       = ieee80211_netdev_select_queue,
 751         .ndo_get_stats64        = ieee80211_get_stats64,
 752 };
 753
 754 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 755                                           struct sk_buff *skb,
 756                                           struct net_device *sb_dev)
 757 {
 758         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 759         struct ieee80211_local *local = sdata->local;
 760         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 761         struct ieee80211_hdr *hdr;
 762         int len_rthdr;
 763
 764         if (local->hw.queues < IEEE80211_NUM_ACS)
 765                 return 0;
 766
 767         /* reset flags and info before parsing radiotap header */
 768         memset(info, 0, sizeof(*info));
 769
 770         if (!ieee80211_parse_tx_radiotap(skb, dev))
 771                 return 0; /* doesn't matter, frame will be dropped */
 772
 773         len_rthdr = ieee80211_get_radiotap_len(skb->data);
 774         hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
 775         if (skb->len < len_rthdr + 2 ||
 776             skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
 777                 return 0; /* doesn't matter, frame will be dropped */
 778
 779         return ieee80211_select_queue_80211(sdata, skb, hdr);
 780 }
 781
 782 static const struct net_device_ops ieee80211_monitorif_ops = {
 783         .ndo_open               = ieee80211_open,
 784         .ndo_stop               = ieee80211_stop,
 785         .ndo_uninit             = ieee80211_uninit,
 786         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 787         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 788         .ndo_set_mac_address    = ieee80211_change_mac,
 789         .ndo_select_queue       = ieee80211_monitor_select_queue,
 790         .ndo_get_stats64        = ieee80211_get_stats64,
 791 };
 792
 793 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx,
 794                                               struct net_device_path *path)
 795 {
 796         struct ieee80211_sub_if_data *sdata;
 797         struct ieee80211_local *local;
 798         struct sta_info *sta;
 799         int ret = -ENOENT;
 800
 801         sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev);
 802         local = sdata->local;
 803
 804         if (!local->ops->net_fill_forward_path)
 805                 return -EOPNOTSUPP;
 806
 807         rcu_read_lock();
 808         switch (sdata->vif.type) {
 809         case NL80211_IFTYPE_AP_VLAN:
 810                 sta = rcu_dereference(sdata->u.vlan.sta);
 811                 if (sta)
 812                         break;
 813                 if (sdata->wdev.use_4addr)
 814                         goto out;
 815                 if (is_multicast_ether_addr(ctx->daddr))
 816                         goto out;
 817                 sta = sta_info_get_bss(sdata, ctx->daddr);
 818                 break;
 819         case NL80211_IFTYPE_AP:
 820                 if (is_multicast_ether_addr(ctx->daddr))
 821                         goto out;
 822                 sta = sta_info_get(sdata, ctx->daddr);
 823                 break;
 824         case NL80211_IFTYPE_STATION:
 825                 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
 826                         sta = sta_info_get(sdata, ctx->daddr);
 827                         if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
 828                                 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
 829                                         goto out;
 830
 831                                 break;
 832                         }
 833                 }
 834
 835                 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
 836                 break;
 837         default:
 838                 goto out;
 839         }
 840
 841         if (!sta)
 842                 goto out;
 843
 844         ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path);
 845 out:
 846         rcu_read_unlock();
 847
 848         return ret;
 849 }
 850
 851 static const struct net_device_ops ieee80211_dataif_8023_ops = {
 852         .ndo_open               = ieee80211_open,
 853         .ndo_stop               = ieee80211_stop,
 854         .ndo_uninit             = ieee80211_uninit,
 855         .ndo_start_xmit         = ieee80211_subif_start_xmit_8023,
 856         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 857         .ndo_set_mac_address    = ieee80211_change_mac,
 858         .ndo_select_queue       = ieee80211_netdev_select_queue,
 859         .ndo_get_stats64        = ieee80211_get_stats64,
 860         .ndo_fill_forward_path  = ieee80211_netdev_fill_forward_path,
 861 };
 862
 863 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)
 864 {
 865         switch (iftype) {
 866         /* P2P GO and client are mapped to AP/STATION types */
 867         case NL80211_IFTYPE_AP:
 868         case NL80211_IFTYPE_STATION:
 869                 return true;
 870         default:
 871                 return false;
 872         }
 873 }
 874
 875 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
 876 {
 877         struct ieee80211_local *local = sdata->local;
 878         u32 flags;
 879
 880         flags = sdata->vif.offload_flags;
 881
 882         if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
 883             ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
 884                 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
 885
 886                 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
 887                     local->hw.wiphy->frag_threshold != (u32)-1)
 888                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 889
 890                 if (local->monitors)
 891                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 892         } else {
 893                 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 894         }
 895
 896         if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) &&
 897             ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
 898                 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED;
 899
 900                 if (local->monitors &&
 901                     !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP))
 902                         flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
 903         } else {
 904                 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
 905         }
 906
 907         if (sdata->vif.offload_flags == flags)
 908                 return false;
 909
 910         sdata->vif.offload_flags = flags;
 911         ieee80211_check_fast_rx_iface(sdata);
 912         return true;
 913 }
 914
 915 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
 916 {
 917         struct ieee80211_local *local = sdata->local;
 918         struct ieee80211_sub_if_data *bss = sdata;
 919         bool enabled;
 920
 921         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 922                 if (!sdata->bss)
 923                         return;
 924
 925                 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
 926         }
 927
 928         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
 929             !ieee80211_iftype_supports_hdr_offload(bss->vif.type))
 930                 return;
 931
 932         enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
 933         if (sdata->wdev.use_4addr &&
 934             !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
 935                 enabled = false;
 936
 937         sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
 938                                            &ieee80211_dataif_ops;
 939 }
 940
 941 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
 942 {
 943         struct ieee80211_local *local = sdata->local;
 944         struct ieee80211_sub_if_data *vsdata;
 945
 946         if (ieee80211_set_sdata_offload_flags(sdata)) {
 947                 drv_update_vif_offload(local, sdata);
 948                 ieee80211_set_vif_encap_ops(sdata);
 949         }
 950
 951         list_for_each_entry(vsdata, &local->interfaces, list) {
 952                 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
 953                     vsdata->bss != &sdata->u.ap)
 954                         continue;
 955
 956                 ieee80211_set_vif_encap_ops(vsdata);
 957         }
 958 }
 959
 960 void ieee80211_recalc_offload(struct ieee80211_local *local)
 961 {
 962         struct ieee80211_sub_if_data *sdata;
 963
 964         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
 965                 return;
 966
 967         mutex_lock(&local->iflist_mtx);
 968
 969         list_for_each_entry(sdata, &local->interfaces, list) {
 970                 if (!ieee80211_sdata_running(sdata))
 971                         continue;
 972
 973                 ieee80211_recalc_sdata_offload(sdata);
 974         }
 975
 976         mutex_unlock(&local->iflist_mtx);
 977 }
 978
 979 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 980                                     const int offset)
 981 {
 982         struct ieee80211_local *local = sdata->local;
 983         u32 flags = sdata->u.mntr.flags;
 984
 985 #define ADJUST(_f, _s)  do {                                    \
 986         if (flags & MONITOR_FLAG_##_f)                          \
 987                 local->fif_##_s += offset;                      \
 988         } while (0)
 989
 990         ADJUST(FCSFAIL, fcsfail);
 991         ADJUST(PLCPFAIL, plcpfail);
 992         ADJUST(CONTROL, control);
 993         ADJUST(CONTROL, pspoll);
 994         ADJUST(OTHER_BSS, other_bss);
 995
 996 #undef ADJUST
 997 }
 998
 999 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
1000 {
1001         struct ieee80211_local *local = sdata->local;
1002         int i;
1003
1004         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
1005                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1006                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
1007                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
1008                         sdata->vif.hw_queue[i] = i;
1009                 else
1010                         sdata->vif.hw_queue[i] = 0;
1011         }
1012         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
1013 }
1014
1015 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
1016 {
1017         struct ieee80211_sub_if_data *sdata;
1018         int ret;
1019
1020         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1021                 return 0;
1022
1023         ASSERT_RTNL();
1024         lockdep_assert_wiphy(local->hw.wiphy);
1025
1026         if (local->monitor_sdata)
1027                 return 0;
1028
1029         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
1030         if (!sdata)
1031                 return -ENOMEM;
1032
1033         /* set up data */
1034         sdata->local = local;
1035         sdata->vif.type = NL80211_IFTYPE_MONITOR;
1036         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
1037                  wiphy_name(local->hw.wiphy));
1038         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
1039
1040         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1041
1042         ieee80211_set_default_queues(sdata);
1043
1044         ret = drv_add_interface(local, sdata);
1045         if (WARN_ON(ret)) {
1046                 /* ok .. stupid driver, it asked for this! */
1047                 kfree(sdata);
1048                 return ret;
1049         }
1050
1051         set_bit(SDATA_STATE_RUNNING, &sdata->state);
1052
1053         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
1054         if (ret) {
1055                 kfree(sdata);
1056                 return ret;
1057         }
1058
1059         mutex_lock(&local->iflist_mtx);
1060         rcu_assign_pointer(local->monitor_sdata, sdata);
1061         mutex_unlock(&local->iflist_mtx);
1062
1063         mutex_lock(&local->mtx);
1064         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
1065                                         IEEE80211_CHANCTX_EXCLUSIVE);
1066         mutex_unlock(&local->mtx);
1067         if (ret) {
1068                 mutex_lock(&local->iflist_mtx);
1069                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
1070                 mutex_unlock(&local->iflist_mtx);
1071                 synchronize_net();
1072                 drv_remove_interface(local, sdata);
1073                 kfree(sdata);
1074                 return ret;
1075         }
1076
1077         skb_queue_head_init(&sdata->skb_queue);
1078         skb_queue_head_init(&sdata->status_queue);
1079         INIT_WORK(&sdata->work, ieee80211_iface_work);
1080
1081         return 0;
1082 }
1083
1084 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
1085 {
1086         struct ieee80211_sub_if_data *sdata;
1087
1088         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1089                 return;
1090
1091         ASSERT_RTNL();
1092         lockdep_assert_wiphy(local->hw.wiphy);
1093
1094         mutex_lock(&local->iflist_mtx);
1095
1096         sdata = rcu_dereference_protected(local->monitor_sdata,
1097                                           lockdep_is_held(&local->iflist_mtx));
1098         if (!sdata) {
1099                 mutex_unlock(&local->iflist_mtx);
1100                 return;
1101         }
1102
1103         RCU_INIT_POINTER(local->monitor_sdata, NULL);
1104         mutex_unlock(&local->iflist_mtx);
1105
1106         synchronize_net();
1107
1108         mutex_lock(&local->mtx);
1109         ieee80211_vif_release_channel(sdata);
1110         mutex_unlock(&local->mtx);
1111
1112         drv_remove_interface(local, sdata);
1113
1114         kfree(sdata);
1115 }
1116
1117 /*
1118  * NOTE: Be very careful when changing this function, it must NOT return
1119  * an error on interface type changes that have been pre-checked, so most
1120  * checks should be in ieee80211_check_concurrent_iface.
1121  */
1122 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1123 {
1124         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1125         struct net_device *dev = wdev->netdev;
1126         struct ieee80211_local *local = sdata->local;
1127         u32 changed = 0;
1128         int res;
1129         u32 hw_reconf_flags = 0;
1130
1131         switch (sdata->vif.type) {
1132         case NL80211_IFTYPE_AP_VLAN: {
1133                 struct ieee80211_sub_if_data *master;
1134
1135                 if (!sdata->bss)
1136                         return -ENOLINK;
1137
1138                 mutex_lock(&local->mtx);
1139                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1140                 mutex_unlock(&local->mtx);
1141
1142                 master = container_of(sdata->bss,
1143                                       struct ieee80211_sub_if_data, u.ap);
1144                 sdata->control_port_protocol =
1145                         master->control_port_protocol;
1146                 sdata->control_port_no_encrypt =
1147                         master->control_port_no_encrypt;
1148                 sdata->control_port_over_nl80211 =
1149                         master->control_port_over_nl80211;
1150                 sdata->control_port_no_preauth =
1151                         master->control_port_no_preauth;
1152                 sdata->vif.cab_queue = master->vif.cab_queue;
1153                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1154                        sizeof(sdata->vif.hw_queue));
1155                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1156
1157                 mutex_lock(&local->key_mtx);
1158                 sdata->crypto_tx_tailroom_needed_cnt +=
1159                         master->crypto_tx_tailroom_needed_cnt;
1160                 mutex_unlock(&local->key_mtx);
1161
1162                 break;
1163                 }
1164         case NL80211_IFTYPE_AP:
1165                 sdata->bss = &sdata->u.ap;
1166                 break;
1167         case NL80211_IFTYPE_MESH_POINT:
1168         case NL80211_IFTYPE_STATION:
1169         case NL80211_IFTYPE_MONITOR:
1170         case NL80211_IFTYPE_ADHOC:
1171         case NL80211_IFTYPE_P2P_DEVICE:
1172         case NL80211_IFTYPE_OCB:
1173         case NL80211_IFTYPE_NAN:
1174                 /* no special treatment */
1175                 break;
1176         case NL80211_IFTYPE_UNSPECIFIED:
1177         case NUM_NL80211_IFTYPES:
1178         case NL80211_IFTYPE_P2P_CLIENT:
1179         case NL80211_IFTYPE_P2P_GO:
1180         case NL80211_IFTYPE_WDS:
1181                 /* cannot happen */
1182                 WARN_ON(1);
1183                 break;
1184         }
1185
1186         if (local->open_count == 0) {
1187                 res = drv_start(local);
1188                 if (res)
1189                         goto err_del_bss;
1190                 /* we're brought up, everything changes */
1191                 hw_reconf_flags = ~0;
1192                 ieee80211_led_radio(local, true);
1193                 ieee80211_mod_tpt_led_trig(local,
1194                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1195         }
1196
1197         /*
1198          * Copy the hopefully now-present MAC address to
1199          * this interface, if it has the special null one.
1200          */
1201         if (dev && is_zero_ether_addr(dev->dev_addr)) {
1202                 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr);
1203                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1204
1205                 if (!is_valid_ether_addr(dev->dev_addr)) {
1206                         res = -EADDRNOTAVAIL;
1207                         goto err_stop;
1208                 }
1209         }
1210
1211         switch (sdata->vif.type) {
1212         case NL80211_IFTYPE_AP_VLAN:
1213                 /* no need to tell driver, but set carrier and chanctx */
1214                 if (rtnl_dereference(sdata->bss->beacon)) {
1215                         ieee80211_vif_vlan_copy_chanctx(sdata);
1216                         netif_carrier_on(dev);
1217                         ieee80211_set_vif_encap_ops(sdata);
1218                 } else {
1219                         netif_carrier_off(dev);
1220                 }
1221                 break;
1222         case NL80211_IFTYPE_MONITOR:
1223                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1224                         local->cooked_mntrs++;
1225                         break;
1226                 }
1227
1228                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1229                         res = drv_add_interface(local, sdata);
1230                         if (res)
1231                                 goto err_stop;
1232                 } else if (local->monitors == 0 && local->open_count == 0) {
1233                         res = ieee80211_add_virtual_monitor(local);
1234                         if (res)
1235                                 goto err_stop;
1236                 }
1237
1238                 /* must be before the call to ieee80211_configure_filter */
1239                 local->monitors++;
1240                 if (local->monitors == 1) {
1241                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1242                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1243                 }
1244
1245                 ieee80211_adjust_monitor_flags(sdata, 1);
1246                 ieee80211_configure_filter(local);
1247                 ieee80211_recalc_offload(local);
1248                 mutex_lock(&local->mtx);
1249                 ieee80211_recalc_idle(local);
1250                 mutex_unlock(&local->mtx);
1251
1252                 netif_carrier_on(dev);
1253                 break;
1254         default:
1255                 if (coming_up) {
1256                         ieee80211_del_virtual_monitor(local);
1257                         ieee80211_set_sdata_offload_flags(sdata);
1258
1259                         res = drv_add_interface(local, sdata);
1260                         if (res)
1261                                 goto err_stop;
1262
1263                         ieee80211_set_vif_encap_ops(sdata);
1264                         res = ieee80211_check_queues(sdata,
1265                                 ieee80211_vif_type_p2p(&sdata->vif));
1266                         if (res)
1267                                 goto err_del_interface;
1268                 }
1269
1270                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1271                         local->fif_pspoll++;
1272                         local->fif_probe_req++;
1273
1274                         ieee80211_configure_filter(local);
1275                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1276                         local->fif_probe_req++;
1277                 }
1278
1279                 if (sdata->vif.probe_req_reg)
1280                         drv_config_iface_filter(local, sdata,
1281                                                 FIF_PROBE_REQ,
1282                                                 FIF_PROBE_REQ);
1283
1284                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1285                     sdata->vif.type != NL80211_IFTYPE_NAN)
1286                         changed |= ieee80211_reset_erp_info(sdata);
1287                 ieee80211_bss_info_change_notify(sdata, changed);
1288
1289                 switch (sdata->vif.type) {
1290                 case NL80211_IFTYPE_STATION:
1291                 case NL80211_IFTYPE_ADHOC:
1292                 case NL80211_IFTYPE_AP:
1293                 case NL80211_IFTYPE_MESH_POINT:
1294                 case NL80211_IFTYPE_OCB:
1295                         netif_carrier_off(dev);
1296                         break;
1297                 case NL80211_IFTYPE_P2P_DEVICE:
1298                 case NL80211_IFTYPE_NAN:
1299                         break;
1300                 default:
1301                         /* not reached */
1302                         WARN_ON(1);
1303                 }
1304
1305                 /*
1306                  * Set default queue parameters so drivers don't
1307                  * need to initialise the hardware if the hardware
1308                  * doesn't start up with sane defaults.
1309                  * Enable QoS for anything but station interfaces.
1310                  */
1311                 ieee80211_set_wmm_default(sdata, true,
1312                         sdata->vif.type != NL80211_IFTYPE_STATION);
1313         }
1314
1315         set_bit(SDATA_STATE_RUNNING, &sdata->state);
1316
1317         switch (sdata->vif.type) {
1318         case NL80211_IFTYPE_P2P_DEVICE:
1319                 rcu_assign_pointer(local->p2p_sdata, sdata);
1320                 break;
1321         case NL80211_IFTYPE_MONITOR:
1322                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1323                         break;
1324                 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1325                 break;
1326         default:
1327                 break;
1328         }
1329
1330         /*
1331          * set_multicast_list will be invoked by the networking core
1332          * which will check whether any increments here were done in
1333          * error and sync them down to the hardware as filter flags.
1334          */
1335         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1336                 atomic_inc(&local->iff_allmultis);
1337
1338         if (coming_up)
1339                 local->open_count++;
1340
1341         if (hw_reconf_flags)
1342                 ieee80211_hw_config(local, hw_reconf_flags);
1343
1344         ieee80211_recalc_ps(local);
1345
1346         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1347             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1348             local->ops->wake_tx_queue) {
1349                 /* XXX: for AP_VLAN, actually track AP queues */
1350                 if (dev)
1351                         netif_tx_start_all_queues(dev);
1352         } else if (dev) {
1353                 unsigned long flags;
1354                 int n_acs = IEEE80211_NUM_ACS;
1355                 int ac;
1356
1357                 if (local->hw.queues < IEEE80211_NUM_ACS)
1358                         n_acs = 1;
1359
1360                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1361                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
1362                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
1363                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
1364                         for (ac = 0; ac < n_acs; ac++) {
1365                                 int ac_queue = sdata->vif.hw_queue[ac];
1366
1367                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
1368                                     skb_queue_empty(&local->pending[ac_queue]))
1369                                         netif_start_subqueue(dev, ac);
1370                         }
1371                 }
1372                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1373         }
1374
1375         return 0;
1376  err_del_interface:
1377         drv_remove_interface(local, sdata);
1378  err_stop:
1379         if (!local->open_count)
1380                 drv_stop(local);
1381  err_del_bss:
1382         sdata->bss = NULL;
1383         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1384                 mutex_lock(&local->mtx);
1385                 list_del(&sdata->u.vlan.list);
1386                 mutex_unlock(&local->mtx);
1387         }
1388         /* might already be clear but that doesn't matter */
1389         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1390         return res;
1391 }
1392
1393 static void ieee80211_if_free(struct net_device *dev)
1394 {
1395         free_percpu(dev->tstats);
1396 }
1397
1398 static void ieee80211_if_setup(struct net_device *dev)
1399 {
1400         ether_setup(dev);
1401         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1402         dev->netdev_ops = &ieee80211_dataif_ops;
1403         dev->needs_free_netdev = true;
1404         dev->priv_destructor = ieee80211_if_free;
1405 }
1406
1407 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1408 {
1409         ieee80211_if_setup(dev);
1410         dev->priv_flags |= IFF_NO_QUEUE;
1411 }
1412
1413 static void ieee80211_iface_process_skb(struct ieee80211_local *local,
1414                                         struct ieee80211_sub_if_data *sdata,
1415                                         struct sk_buff *skb)
1416 {
1417         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1418
1419         if (ieee80211_is_action(mgmt->frame_control) &&
1420             mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1421                 struct sta_info *sta;
1422                 int len = skb->len;
1423
1424                 mutex_lock(&local->sta_mtx);
1425                 sta = sta_info_get_bss(sdata, mgmt->sa);
1426                 if (sta) {
1427                         switch (mgmt->u.action.u.addba_req.action_code) {
1428                         case WLAN_ACTION_ADDBA_REQ:
1429                                 ieee80211_process_addba_request(local, sta,
1430                                                                 mgmt, len);
1431                                 break;
1432                         case WLAN_ACTION_ADDBA_RESP:
1433                                 ieee80211_process_addba_resp(local, sta,
1434                                                              mgmt, len);
1435                                 break;
1436                         case WLAN_ACTION_DELBA:
1437                                 ieee80211_process_delba(sdata, sta,
1438                                                         mgmt, len);
1439                                 break;
1440                         default:
1441                                 WARN_ON(1);
1442                                 break;
1443                         }
1444                 }
1445                 mutex_unlock(&local->sta_mtx);
1446         } else if (ieee80211_is_action(mgmt->frame_control) &&
1447                    mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1448                 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1449                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1450                         struct ieee80211_rx_status *status;
1451                         enum nl80211_band band;
1452                         struct sta_info *sta;
1453                         u8 opmode;
1454
1455                         status = IEEE80211_SKB_RXCB(skb);
1456                         band = status->band;
1457                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1458
1459                         mutex_lock(&local->sta_mtx);
1460                         sta = sta_info_get_bss(sdata, mgmt->sa);
1461
1462                         if (sta)
1463                                 ieee80211_vht_handle_opmode(sdata, sta, opmode,
1464                                                             band);
1465
1466                         mutex_unlock(&local->sta_mtx);
1467                         break;
1468                 }
1469                 case WLAN_VHT_ACTION_GROUPID_MGMT:
1470                         ieee80211_process_mu_groups(sdata, mgmt);
1471                         break;
1472                 default:
1473                         WARN_ON(1);
1474                         break;
1475                 }
1476         } else if (ieee80211_is_action(mgmt->frame_control) &&
1477                    mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1478                 switch (mgmt->u.action.u.s1g.action_code) {
1479                 case WLAN_S1G_TWT_TEARDOWN:
1480                 case WLAN_S1G_TWT_SETUP:
1481                         ieee80211_s1g_rx_twt_action(sdata, skb);
1482                         break;
1483                 default:
1484                         break;
1485                 }
1486         } else if (ieee80211_is_ext(mgmt->frame_control)) {
1487                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1488                         ieee80211_sta_rx_queued_ext(sdata, skb);
1489                 else
1490                         WARN_ON(1);
1491         } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1492                 struct ieee80211_hdr *hdr = (void *)mgmt;
1493                 struct sta_info *sta;
1494
1495                 /*
1496                  * So the frame isn't mgmt, but frame_control
1497                  * is at the right place anyway, of course, so
1498                  * the if statement is correct.
1499                  *
1500                  * Warn if we have other data frame types here,
1501                  * they must not get here.
1502                  */
1503                 WARN_ON(hdr->frame_control &
1504                                 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1505                 WARN_ON(!(hdr->seq_ctrl &
1506                                 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1507                 /*
1508                  * This was a fragment of a frame, received while
1509                  * a block-ack session was active. That cannot be
1510                  * right, so terminate the session.
1511                  */
1512                 mutex_lock(&local->sta_mtx);
1513                 sta = sta_info_get_bss(sdata, mgmt->sa);
1514                 if (sta) {
1515                         u16 tid = ieee80211_get_tid(hdr);
1516
1517                         __ieee80211_stop_rx_ba_session(
1518                                 sta, tid, WLAN_BACK_RECIPIENT,
1519                                 WLAN_REASON_QSTA_REQUIRE_SETUP,
1520                                 true);
1521                 }
1522                 mutex_unlock(&local->sta_mtx);
1523         } else switch (sdata->vif.type) {
1524         case NL80211_IFTYPE_STATION:
1525                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1526                 break;
1527         case NL80211_IFTYPE_ADHOC:
1528                 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1529                 break;
1530         case NL80211_IFTYPE_MESH_POINT:
1531                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1532                         break;
1533                 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1534                 break;
1535         default:
1536                 WARN(1, "frame for unexpected interface type");
1537                 break;
1538         }
1539 }
1540
1541 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata,
1542                                            struct sk_buff *skb)
1543 {
1544         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1545
1546         if (ieee80211_is_action(mgmt->frame_control) &&
1547             mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1548                 switch (mgmt->u.action.u.s1g.action_code) {
1549                 case WLAN_S1G_TWT_TEARDOWN:
1550                 case WLAN_S1G_TWT_SETUP:
1551                         ieee80211_s1g_status_twt_action(sdata, skb);
1552                         break;
1553                 default:
1554                         break;
1555                 }
1556         }
1557 }
1558
1559 static void ieee80211_iface_work(struct work_struct *work)
1560 {
1561         struct ieee80211_sub_if_data *sdata =
1562                 container_of(work, struct ieee80211_sub_if_data, work);
1563         struct ieee80211_local *local = sdata->local;
1564         struct sk_buff *skb;
1565
1566         if (!ieee80211_sdata_running(sdata))
1567                 return;
1568
1569         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1570                 return;
1571
1572         if (!ieee80211_can_run_worker(local))
1573                 return;
1574
1575         /* first process frames */
1576         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1577                 kcov_remote_start_common(skb_get_kcov_handle(skb));
1578
1579                 if (skb->protocol == cpu_to_be16(ETH_P_TDLS))
1580                         ieee80211_process_tdls_channel_switch(sdata, skb);
1581                 else
1582                         ieee80211_iface_process_skb(local, sdata, skb);
1583
1584                 kfree_skb(skb);
1585                 kcov_remote_stop();
1586         }
1587
1588         /* process status queue */
1589         while ((skb = skb_dequeue(&sdata->status_queue))) {
1590                 kcov_remote_start_common(skb_get_kcov_handle(skb));
1591
1592                 ieee80211_iface_process_status(sdata, skb);
1593                 kfree_skb(skb);
1594
1595                 kcov_remote_stop();
1596         }
1597
1598         /* then other type-dependent work */
1599         switch (sdata->vif.type) {
1600         case NL80211_IFTYPE_STATION:
1601                 ieee80211_sta_work(sdata);
1602                 break;
1603         case NL80211_IFTYPE_ADHOC:
1604                 ieee80211_ibss_work(sdata);
1605                 break;
1606         case NL80211_IFTYPE_MESH_POINT:
1607                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1608                         break;
1609                 ieee80211_mesh_work(sdata);
1610                 break;
1611         case NL80211_IFTYPE_OCB:
1612                 ieee80211_ocb_work(sdata);
1613                 break;
1614         default:
1615                 break;
1616         }
1617 }
1618
1619 static void ieee80211_recalc_smps_work(struct work_struct *work)
1620 {
1621         struct ieee80211_sub_if_data *sdata =
1622                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1623
1624         ieee80211_recalc_smps(sdata);
1625 }
1626
1627 /*
1628  * Helper function to initialise an interface to a specific type.
1629  */
1630 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1631                                   enum nl80211_iftype type)
1632 {
1633         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1634                                                     0xff, 0xff, 0xff};
1635
1636         /* clear type-dependent union */
1637         memset(&sdata->u, 0, sizeof(sdata->u));
1638
1639         /* and set some type-dependent values */
1640         sdata->vif.type = type;
1641         sdata->vif.p2p = false;
1642         sdata->wdev.iftype = type;
1643
1644         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1645         sdata->control_port_no_encrypt = false;
1646         sdata->control_port_over_nl80211 = false;
1647         sdata->control_port_no_preauth = false;
1648         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1649         sdata->vif.bss_conf.idle = true;
1650         sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1651
1652         sdata->noack_map = 0;
1653
1654         /* only monitor/p2p-device differ */
1655         if (sdata->dev) {
1656                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1657                 sdata->dev->type = ARPHRD_ETHER;
1658         }
1659
1660         skb_queue_head_init(&sdata->skb_queue);
1661         skb_queue_head_init(&sdata->status_queue);
1662         INIT_WORK(&sdata->work, ieee80211_iface_work);
1663         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1664         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1665         INIT_WORK(&sdata->color_change_finalize_work, ieee80211_color_change_finalize_work);
1666         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1667         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1668
1669         switch (type) {
1670         case NL80211_IFTYPE_P2P_GO:
1671                 type = NL80211_IFTYPE_AP;
1672                 sdata->vif.type = type;
1673                 sdata->vif.p2p = true;
1674                 fallthrough;
1675         case NL80211_IFTYPE_AP:
1676                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1677                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1678                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1679                 break;
1680         case NL80211_IFTYPE_P2P_CLIENT:
1681                 type = NL80211_IFTYPE_STATION;
1682                 sdata->vif.type = type;
1683                 sdata->vif.p2p = true;
1684                 fallthrough;
1685         case NL80211_IFTYPE_STATION:
1686                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1687                 ieee80211_sta_setup_sdata(sdata);
1688                 break;
1689         case NL80211_IFTYPE_OCB:
1690                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1691                 ieee80211_ocb_setup_sdata(sdata);
1692                 break;
1693         case NL80211_IFTYPE_ADHOC:
1694                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1695                 ieee80211_ibss_setup_sdata(sdata);
1696                 break;
1697         case NL80211_IFTYPE_MESH_POINT:
1698                 if (ieee80211_vif_is_mesh(&sdata->vif))
1699                         ieee80211_mesh_init_sdata(sdata);
1700                 break;
1701         case NL80211_IFTYPE_MONITOR:
1702                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1703                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1704                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1705                                       MONITOR_FLAG_OTHER_BSS;
1706                 break;
1707         case NL80211_IFTYPE_NAN:
1708                 idr_init(&sdata->u.nan.function_inst_ids);
1709                 spin_lock_init(&sdata->u.nan.func_lock);
1710                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1711                 break;
1712         case NL80211_IFTYPE_AP_VLAN:
1713         case NL80211_IFTYPE_P2P_DEVICE:
1714                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1715                 break;
1716         case NL80211_IFTYPE_UNSPECIFIED:
1717         case NL80211_IFTYPE_WDS:
1718         case NUM_NL80211_IFTYPES:
1719                 WARN_ON(1);
1720                 break;
1721         }
1722
1723         ieee80211_debugfs_add_netdev(sdata);
1724 }
1725
1726 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1727                                            enum nl80211_iftype type)
1728 {
1729         struct ieee80211_local *local = sdata->local;
1730         int ret, err;
1731         enum nl80211_iftype internal_type = type;
1732         bool p2p = false;
1733
1734         ASSERT_RTNL();
1735
1736         if (!local->ops->change_interface)
1737                 return -EBUSY;
1738
1739         switch (sdata->vif.type) {
1740         case NL80211_IFTYPE_AP:
1741                 if (!list_empty(&sdata->u.ap.vlans))
1742                         return -EBUSY;
1743                 break;
1744         case NL80211_IFTYPE_STATION:
1745         case NL80211_IFTYPE_ADHOC:
1746         case NL80211_IFTYPE_OCB:
1747                 /*
1748                  * Could maybe also all others here?
1749                  * Just not sure how that interacts
1750                  * with the RX/config path e.g. for
1751                  * mesh.
1752                  */
1753                 break;
1754         default:
1755                 return -EBUSY;
1756         }
1757
1758         switch (type) {
1759         case NL80211_IFTYPE_AP:
1760         case NL80211_IFTYPE_STATION:
1761         case NL80211_IFTYPE_ADHOC:
1762         case NL80211_IFTYPE_OCB:
1763                 /*
1764                  * Could probably support everything
1765                  * but here.
1766                  */
1767                 break;
1768         case NL80211_IFTYPE_P2P_CLIENT:
1769                 p2p = true;
1770                 internal_type = NL80211_IFTYPE_STATION;
1771                 break;
1772         case NL80211_IFTYPE_P2P_GO:
1773                 p2p = true;
1774                 internal_type = NL80211_IFTYPE_AP;
1775                 break;
1776         default:
1777                 return -EBUSY;
1778         }
1779
1780         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1781         if (ret)
1782                 return ret;
1783
1784         ieee80211_stop_vif_queues(local, sdata,
1785                                   IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1786         synchronize_net();
1787
1788         ieee80211_do_stop(sdata, false);
1789
1790         ieee80211_teardown_sdata(sdata);
1791
1792         ieee80211_set_sdata_offload_flags(sdata);
1793         ret = drv_change_interface(local, sdata, internal_type, p2p);
1794         if (ret)
1795                 type = ieee80211_vif_type_p2p(&sdata->vif);
1796
1797         /*
1798          * Ignore return value here, there's not much we can do since
1799          * the driver changed the interface type internally already.
1800          * The warnings will hopefully make driver authors fix it :-)
1801          */
1802         ieee80211_check_queues(sdata, type);
1803
1804         ieee80211_setup_sdata(sdata, type);
1805         ieee80211_set_vif_encap_ops(sdata);
1806
1807         err = ieee80211_do_open(&sdata->wdev, false);
1808         WARN(err, "type change: do_open returned %d", err);
1809
1810         ieee80211_wake_vif_queues(local, sdata,
1811                                   IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1812         return ret;
1813 }
1814
1815 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1816                              enum nl80211_iftype type)
1817 {
1818         int ret;
1819
1820         ASSERT_RTNL();
1821
1822         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1823                 return 0;
1824
1825         if (ieee80211_sdata_running(sdata)) {
1826                 ret = ieee80211_runtime_change_iftype(sdata, type);
1827                 if (ret)
1828                         return ret;
1829         } else {
1830                 /* Purge and reset type-dependent state. */
1831                 ieee80211_teardown_sdata(sdata);
1832                 ieee80211_setup_sdata(sdata, type);
1833         }
1834
1835         /* reset some values that shouldn't be kept across type changes */
1836         if (type == NL80211_IFTYPE_STATION)
1837                 sdata->u.mgd.use_4addr = false;
1838
1839         return 0;
1840 }
1841
1842 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1843                                        u8 *perm_addr, enum nl80211_iftype type)
1844 {
1845         struct ieee80211_sub_if_data *sdata;
1846         u64 mask, start, addr, val, inc;
1847         u8 *m;
1848         u8 tmp_addr[ETH_ALEN];
1849         int i;
1850
1851         /* default ... something at least */
1852         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1853
1854         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1855             local->hw.wiphy->n_addresses <= 1)
1856                 return;
1857
1858         mutex_lock(&local->iflist_mtx);
1859
1860         switch (type) {
1861         case NL80211_IFTYPE_MONITOR:
1862                 /* doesn't matter */
1863                 break;
1864         case NL80211_IFTYPE_AP_VLAN:
1865                 /* match up with an AP interface */
1866                 list_for_each_entry(sdata, &local->interfaces, list) {
1867                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1868                                 continue;
1869                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1870                         break;
1871                 }
1872                 /* keep default if no AP interface present */
1873                 break;
1874         case NL80211_IFTYPE_P2P_CLIENT:
1875         case NL80211_IFTYPE_P2P_GO:
1876                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1877                         list_for_each_entry(sdata, &local->interfaces, list) {
1878                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1879                                         continue;
1880                                 if (!ieee80211_sdata_running(sdata))
1881                                         continue;
1882                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1883                                 goto out_unlock;
1884                         }
1885                 }
1886                 fallthrough;
1887         default:
1888                 /* assign a new address if possible -- try n_addresses first */
1889                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1890                         bool used = false;
1891
1892                         list_for_each_entry(sdata, &local->interfaces, list) {
1893                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1894                                                      sdata->vif.addr)) {
1895                                         used = true;
1896                                         break;
1897                                 }
1898                         }
1899
1900                         if (!used) {
1901                                 memcpy(perm_addr,
1902                                        local->hw.wiphy->addresses[i].addr,
1903                                        ETH_ALEN);
1904                                 break;
1905                         }
1906                 }
1907
1908                 /* try mask if available */
1909                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1910                         break;
1911
1912                 m = local->hw.wiphy->addr_mask;
1913                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1914                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1915                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1916
1917                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1918                         /* not a contiguous mask ... not handled now! */
1919                         pr_info("not contiguous\n");
1920                         break;
1921                 }
1922
1923                 /*
1924                  * Pick address of existing interface in case user changed
1925                  * MAC address manually, default to perm_addr.
1926                  */
1927                 m = local->hw.wiphy->perm_addr;
1928                 list_for_each_entry(sdata, &local->interfaces, list) {
1929                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1930                                 continue;
1931                         m = sdata->vif.addr;
1932                         break;
1933                 }
1934                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1935                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1936                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1937
1938                 inc = 1ULL<<__ffs64(mask);
1939                 val = (start & mask);
1940                 addr = (start & ~mask) | (val & mask);
1941                 do {
1942                         bool used = false;
1943
1944                         tmp_addr[5] = addr >> 0*8;
1945                         tmp_addr[4] = addr >> 1*8;
1946                         tmp_addr[3] = addr >> 2*8;
1947                         tmp_addr[2] = addr >> 3*8;
1948                         tmp_addr[1] = addr >> 4*8;
1949                         tmp_addr[0] = addr >> 5*8;
1950
1951                         val += inc;
1952
1953                         list_for_each_entry(sdata, &local->interfaces, list) {
1954                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1955                                         used = true;
1956                                         break;
1957                                 }
1958                         }
1959
1960                         if (!used) {
1961                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1962                                 break;
1963                         }
1964                         addr = (start & ~mask) | (val & mask);
1965                 } while (addr != start);
1966
1967                 break;
1968         }
1969
1970  out_unlock:
1971         mutex_unlock(&local->iflist_mtx);
1972 }
1973
1974 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1975                      unsigned char name_assign_type,
1976                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1977                      struct vif_params *params)
1978 {
1979         struct net_device *ndev = NULL;
1980         struct ieee80211_sub_if_data *sdata = NULL;
1981         struct txq_info *txqi;
1982         void (*if_setup)(struct net_device *dev);
1983         int ret, i;
1984         int txqs = 1;
1985
1986         ASSERT_RTNL();
1987
1988         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1989                 struct wireless_dev *wdev;
1990
1991                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1992                                 GFP_KERNEL);
1993                 if (!sdata)
1994                         return -ENOMEM;
1995                 wdev = &sdata->wdev;
1996
1997                 sdata->dev = NULL;
1998                 strlcpy(sdata->name, name, IFNAMSIZ);
1999                 ieee80211_assign_perm_addr(local, wdev->address, type);
2000                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
2001         } else {
2002                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
2003                                  sizeof(void *));
2004                 int txq_size = 0;
2005
2006                 if (local->ops->wake_tx_queue &&
2007                     type != NL80211_IFTYPE_AP_VLAN &&
2008                     (type != NL80211_IFTYPE_MONITOR ||
2009                      (params->flags & MONITOR_FLAG_ACTIVE)))
2010                         txq_size += sizeof(struct txq_info) +
2011                                     local->hw.txq_data_size;
2012
2013                 if (local->ops->wake_tx_queue) {
2014                         if_setup = ieee80211_if_setup_no_queue;
2015                 } else {
2016                         if_setup = ieee80211_if_setup;
2017                         if (local->hw.queues >= IEEE80211_NUM_ACS)
2018                                 txqs = IEEE80211_NUM_ACS;
2019                 }
2020
2021                 ndev = alloc_netdev_mqs(size + txq_size,
2022                                         name, name_assign_type,
2023                                         if_setup, txqs, 1);
2024                 if (!ndev)
2025                         return -ENOMEM;
2026
2027                 if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len)
2028                         ndev->tx_queue_len = local->hw.wiphy->tx_queue_len;
2029
2030                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
2031
2032                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2033                 if (!ndev->tstats) {
2034                         free_netdev(ndev);
2035                         return -ENOMEM;
2036                 }
2037
2038                 ndev->needed_headroom = local->tx_headroom +
2039                                         4*6 /* four MAC addresses */
2040                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
2041                                         + 6 /* mesh */
2042                                         + 8 /* rfc1042/bridge tunnel */
2043                                         - ETH_HLEN /* ethernet hard_header_len */
2044                                         + IEEE80211_ENCRYPT_HEADROOM;
2045                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
2046
2047                 ret = dev_alloc_name(ndev, ndev->name);
2048                 if (ret < 0) {
2049                         ieee80211_if_free(ndev);
2050                         free_netdev(ndev);
2051                         return ret;
2052                 }
2053
2054                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
2055                 if (is_valid_ether_addr(params->macaddr))
2056                         eth_hw_addr_set(ndev, params->macaddr);
2057                 else
2058                         eth_hw_addr_set(ndev, ndev->perm_addr);
2059                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
2060
2061                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
2062                 sdata = netdev_priv(ndev);
2063                 ndev->ieee80211_ptr = &sdata->wdev;
2064                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
2065                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
2066
2067                 if (txq_size) {
2068                         txqi = netdev_priv(ndev) + size;
2069                         ieee80211_txq_init(sdata, NULL, txqi, 0);
2070                 }
2071
2072                 sdata->dev = ndev;
2073         }
2074
2075         /* initialise type-independent data */
2076         sdata->wdev.wiphy = local->hw.wiphy;
2077         sdata->local = local;
2078
2079         ieee80211_init_frag_cache(&sdata->frags);
2080
2081         INIT_LIST_HEAD(&sdata->key_list);
2082
2083         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
2084                           ieee80211_dfs_cac_timer_work);
2085         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
2086                           ieee80211_delayed_tailroom_dec);
2087
2088         for (i = 0; i < NUM_NL80211_BANDS; i++) {
2089                 struct ieee80211_supported_band *sband;
2090                 sband = local->hw.wiphy->bands[i];
2091                 sdata->rc_rateidx_mask[i] =
2092                         sband ? (1 << sband->n_bitrates) - 1 : 0;
2093                 if (sband) {
2094                         __le16 cap;
2095                         u16 *vht_rate_mask;
2096
2097                         memcpy(sdata->rc_rateidx_mcs_mask[i],
2098                                sband->ht_cap.mcs.rx_mask,
2099                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
2100
2101                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
2102                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
2103                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
2104                 } else {
2105                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
2106                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
2107                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
2108                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
2109                 }
2110         }
2111
2112         for (i = 0; i < IEEE80211_NUM_ACS; i++)
2113                 init_airtime_info(&sdata->airtime[i], &local->airtime[i]);
2114
2115         ieee80211_set_default_queues(sdata);
2116
2117         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2118         sdata->user_power_level = local->user_power_level;
2119
2120         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2121
2122         /* setup type-dependent data */
2123         ieee80211_setup_sdata(sdata, type);
2124
2125         if (ndev) {
2126                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
2127                 if (type == NL80211_IFTYPE_STATION)
2128                         sdata->u.mgd.use_4addr = params->use_4addr;
2129
2130                 ndev->features |= local->hw.netdev_features;
2131                 ndev->hw_features |= ndev->features &
2132                                         MAC80211_SUPPORTED_FEATURES_TX;
2133
2134                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
2135
2136                 /* MTU range is normally 256 - 2304, where the upper limit is
2137                  * the maximum MSDU size. Monitor interfaces send and receive
2138                  * MPDU and A-MSDU frames which may be much larger so we do
2139                  * not impose an upper limit in that case.
2140                  */
2141                 ndev->min_mtu = 256;
2142                 if (type == NL80211_IFTYPE_MONITOR)
2143                         ndev->max_mtu = 0;
2144                 else
2145                         ndev->max_mtu = local->hw.max_mtu;
2146
2147                 ret = cfg80211_register_netdevice(ndev);
2148                 if (ret) {
2149                         free_netdev(ndev);
2150                         return ret;
2151                 }
2152         }
2153
2154         mutex_lock(&local->iflist_mtx);
2155         list_add_tail_rcu(&sdata->list, &local->interfaces);
2156         mutex_unlock(&local->iflist_mtx);
2157
2158         if (new_wdev)
2159                 *new_wdev = &sdata->wdev;
2160
2161         return 0;
2162 }
2163
2164 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2165 {
2166         ASSERT_RTNL();
2167
2168         mutex_lock(&sdata->local->iflist_mtx);
2169         list_del_rcu(&sdata->list);
2170         mutex_unlock(&sdata->local->iflist_mtx);
2171
2172         if (sdata->vif.txq)
2173                 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2174
2175         synchronize_rcu();
2176
2177         cfg80211_unregister_wdev(&sdata->wdev);
2178
2179         if (!sdata->dev) {
2180                 ieee80211_teardown_sdata(sdata);
2181                 kfree(sdata);
2182         }
2183 }
2184
2185 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2186 {
2187         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2188                 return;
2189         ieee80211_do_stop(sdata, true);
2190 }
2191
2192 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2193 {
2194         struct ieee80211_sub_if_data *sdata, *tmp;
2195         LIST_HEAD(unreg_list);
2196         LIST_HEAD(wdev_list);
2197
2198         ASSERT_RTNL();
2199
2200         /* Before destroying the interfaces, make sure they're all stopped so
2201          * that the hardware is stopped. Otherwise, the driver might still be
2202          * iterating the interfaces during the shutdown, e.g. from a worker
2203          * or from RX processing or similar, and if it does so (using atomic
2204          * iteration) while we're manipulating the list, the iteration will
2205          * crash.
2206          *
2207          * After this, the hardware should be stopped and the driver should
2208          * have stopped all of its activities, so that we can do RCU-unaware
2209          * manipulations of the interface list below.
2210          */
2211         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2212
2213         WARN(local->open_count, "%s: open count remains %d\n",
2214              wiphy_name(local->hw.wiphy), local->open_count);
2215
2216         ieee80211_txq_teardown_flows(local);
2217
2218         mutex_lock(&local->iflist_mtx);
2219         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
2220                 list_del(&sdata->list);
2221
2222                 if (sdata->dev)
2223                         unregister_netdevice_queue(sdata->dev, &unreg_list);
2224                 else
2225                         list_add(&sdata->list, &wdev_list);
2226         }
2227         mutex_unlock(&local->iflist_mtx);
2228
2229         unregister_netdevice_many(&unreg_list);
2230
2231         wiphy_lock(local->hw.wiphy);
2232         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2233                 list_del(&sdata->list);
2234                 cfg80211_unregister_wdev(&sdata->wdev);
2235                 kfree(sdata);
2236         }
2237         wiphy_unlock(local->hw.wiphy);
2238 }
2239
2240 static int netdev_notify(struct notifier_block *nb,
2241                          unsigned long state, void *ptr)
2242 {
2243         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2244         struct ieee80211_sub_if_data *sdata;
2245
2246         if (state != NETDEV_CHANGENAME)
2247                 return NOTIFY_DONE;
2248
2249         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2250                 return NOTIFY_DONE;
2251
2252         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2253                 return NOTIFY_DONE;
2254
2255         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2256         memcpy(sdata->name, dev->name, IFNAMSIZ);
2257         ieee80211_debugfs_rename_netdev(sdata);
2258
2259         return NOTIFY_OK;
2260 }
2261
2262 static struct notifier_block mac80211_netdev_notifier = {
2263         .notifier_call = netdev_notify,
2264 };
2265
2266 int ieee80211_iface_init(void)
2267 {
2268         return register_netdevice_notifier(&mac80211_netdev_notifier);
2269 }
2270
2271 void ieee80211_iface_exit(void)
2272 {
2273         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2274 }
2275
2276 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2277 {
2278         if (sdata->vif.type == NL80211_IFTYPE_AP)
2279                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2280         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2281                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2282 }
2283
2284 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2285 {
2286         if (sdata->vif.type == NL80211_IFTYPE_AP)
2287                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2288         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2289                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2290 }