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