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) 2018-2020 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
 466         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 467
 468         if (sdata->wdev.cac_started) {
 469                 chandef = sdata->vif.bss_conf.chandef;
 470                 WARN_ON(local->suspended);
 471                 mutex_lock(&local->mtx);
 472                 ieee80211_vif_release_channel(sdata);
 473                 mutex_unlock(&local->mtx);
 474                 cfg80211_cac_event(sdata->dev, &chandef,
 475                                    NL80211_RADAR_CAC_ABORTED,
 476                                    GFP_KERNEL);
 477         }
 478
 479         /* APs need special treatment */
 480         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 481                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 482
 483                 /* down all dependent devices, that is VLANs */
 484                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 485                                          u.vlan.list)
 486                         dev_close(vlan->dev);
 487                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 488         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 489                 /* remove all packets in parent bc_buf pointing to this dev */
 490                 ps = &sdata->bss->ps;
 491
 492                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 493                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 494                         if (skb->dev == sdata->dev) {
 495                                 __skb_unlink(skb, &ps->bc_buf);
 496                                 local->total_ps_buffered--;
 497                                 ieee80211_free_txskb(&local->hw, skb);
 498                         }
 499                 }
 500                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 501         }
 502
 503         if (going_down)
 504                 local->open_count--;
 505
 506         switch (sdata->vif.type) {
 507         case NL80211_IFTYPE_AP_VLAN:
 508                 mutex_lock(&local->mtx);
 509                 list_del(&sdata->u.vlan.list);
 510                 mutex_unlock(&local->mtx);
 511                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 512                 /* see comment in the default case below */
 513                 ieee80211_free_keys(sdata, true);
 514                 /* no need to tell driver */
 515                 break;
 516         case NL80211_IFTYPE_MONITOR:
 517                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 518                         local->cooked_mntrs--;
 519                         break;
 520                 }
 521
 522                 local->monitors--;
 523                 if (local->monitors == 0) {
 524                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 525                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 526                 }
 527
 528                 ieee80211_adjust_monitor_flags(sdata, -1);
 529                 break;
 530         case NL80211_IFTYPE_NAN:
 531                 /* clean all the functions */
 532                 spin_lock_bh(&sdata->u.nan.func_lock);
 533
 534                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
 535                         idr_remove(&sdata->u.nan.function_inst_ids, i);
 536                         cfg80211_free_nan_func(func);
 537                 }
 538                 idr_destroy(&sdata->u.nan.function_inst_ids);
 539
 540                 spin_unlock_bh(&sdata->u.nan.func_lock);
 541                 break;
 542         case NL80211_IFTYPE_P2P_DEVICE:
 543                 /* relies on synchronize_rcu() below */
 544                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 545                 fallthrough;
 546         default:
 547                 cancel_work_sync(&sdata->work);
 548                 /*
 549                  * When we get here, the interface is marked down.
 550                  * Free the remaining keys, if there are any
 551                  * (which can happen in AP mode if userspace sets
 552                  * keys before the interface is operating)
 553                  *
 554                  * Force the key freeing to always synchronize_net()
 555                  * to wait for the RX path in case it is using this
 556                  * interface enqueuing frames at this very time on
 557                  * another CPU.
 558                  */
 559                 ieee80211_free_keys(sdata, true);
 560                 skb_queue_purge(&sdata->skb_queue);
 561         }
 562
 563         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 564         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 565                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 566                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 567                         if (info->control.vif == &sdata->vif) {
 568                                 __skb_unlink(skb, &local->pending[i]);
 569                                 ieee80211_free_txskb(&local->hw, skb);
 570                         }
 571                 }
 572         }
 573         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 574
 575         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 576                 ieee80211_txq_remove_vlan(local, sdata);
 577
 578         sdata->bss = NULL;
 579
 580         if (local->open_count == 0)
 581                 ieee80211_clear_tx_pending(local);
 582
 583         sdata->vif.bss_conf.beacon_int = 0;
 584
 585         /*
 586          * If the interface goes down while suspended, presumably because
 587          * the device was unplugged and that happens before our resume,
 588          * then the driver is already unconfigured and the remainder of
 589          * this function isn't needed.
 590          * XXX: what about WoWLAN? If the device has software state, e.g.
 591          *      memory allocated, it might expect teardown commands from
 592          *      mac80211 here?
 593          */
 594         if (local->suspended) {
 595                 WARN_ON(local->wowlan);
 596                 WARN_ON(rtnl_dereference(local->monitor_sdata));
 597                 return;
 598         }
 599
 600         switch (sdata->vif.type) {
 601         case NL80211_IFTYPE_AP_VLAN:
 602                 break;
 603         case NL80211_IFTYPE_MONITOR:
 604                 if (local->monitors == 0)
 605                         ieee80211_del_virtual_monitor(local);
 606
 607                 mutex_lock(&local->mtx);
 608                 ieee80211_recalc_idle(local);
 609                 mutex_unlock(&local->mtx);
 610
 611                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 612                         break;
 613
 614                 fallthrough;
 615         default:
 616                 if (going_down)
 617                         drv_remove_interface(local, sdata);
 618         }
 619
 620         ieee80211_recalc_ps(local);
 621
 622         if (cancel_scan)
 623                 flush_delayed_work(&local->scan_work);
 624
 625         if (local->open_count == 0) {
 626                 ieee80211_stop_device(local);
 627
 628                 /* no reconfiguring after stop! */
 629                 return;
 630         }
 631
 632         /* do after stop to avoid reconfiguring when we stop anyway */
 633         ieee80211_configure_filter(local);
 634         ieee80211_hw_config(local, hw_reconf_flags);
 635
 636         if (local->monitors == local->open_count)
 637                 ieee80211_add_virtual_monitor(local);
 638 }
 639
 640 static int ieee80211_stop(struct net_device *dev)
 641 {
 642         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 643
 644         wiphy_lock(sdata->local->hw.wiphy);
 645         ieee80211_do_stop(sdata, true);
 646         wiphy_unlock(sdata->local->hw.wiphy);
 647
 648         return 0;
 649 }
 650
 651 static void ieee80211_set_multicast_list(struct net_device *dev)
 652 {
 653         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 654         struct ieee80211_local *local = sdata->local;
 655         int allmulti, sdata_allmulti;
 656
 657         allmulti = !!(dev->flags & IFF_ALLMULTI);
 658         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 659
 660         if (allmulti != sdata_allmulti) {
 661                 if (dev->flags & IFF_ALLMULTI)
 662                         atomic_inc(&local->iff_allmultis);
 663                 else
 664                         atomic_dec(&local->iff_allmultis);
 665                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 666         }
 667
 668         spin_lock_bh(&local->filter_lock);
 669         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 670         spin_unlock_bh(&local->filter_lock);
 671         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 672 }
 673
 674 /*
 675  * Called when the netdev is removed or, by the code below, before
 676  * the interface type changes.
 677  */
 678 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 679 {
 680         int i;
 681
 682         /* free extra data */
 683         ieee80211_free_keys(sdata, false);
 684
 685         ieee80211_debugfs_remove_netdev(sdata);
 686
 687         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 688                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 689         sdata->fragment_next = 0;
 690
 691         if (ieee80211_vif_is_mesh(&sdata->vif))
 692                 ieee80211_mesh_teardown_sdata(sdata);
 693 }
 694
 695 static void ieee80211_uninit(struct net_device *dev)
 696 {
 697         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
 698 }
 699
 700 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 701                                          struct sk_buff *skb,
 702                                          struct net_device *sb_dev)
 703 {
 704         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 705 }
 706
 707 static void
 708 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 709 {
 710         dev_fetch_sw_netstats(stats, dev->tstats);
 711 }
 712
 713 static const struct net_device_ops ieee80211_dataif_ops = {
 714         .ndo_open               = ieee80211_open,
 715         .ndo_stop               = ieee80211_stop,
 716         .ndo_uninit             = ieee80211_uninit,
 717         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 718         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 719         .ndo_set_mac_address    = ieee80211_change_mac,
 720         .ndo_select_queue       = ieee80211_netdev_select_queue,
 721         .ndo_get_stats64        = ieee80211_get_stats64,
 722 };
 723
 724 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 725                                           struct sk_buff *skb,
 726                                           struct net_device *sb_dev)
 727 {
 728         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 729         struct ieee80211_local *local = sdata->local;
 730         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 731         struct ieee80211_hdr *hdr;
 732         int len_rthdr;
 733
 734         if (local->hw.queues < IEEE80211_NUM_ACS)
 735                 return 0;
 736
 737         /* reset flags and info before parsing radiotap header */
 738         memset(info, 0, sizeof(*info));
 739
 740         if (!ieee80211_parse_tx_radiotap(skb, dev))
 741                 return 0; /* doesn't matter, frame will be dropped */
 742
 743         len_rthdr = ieee80211_get_radiotap_len(skb->data);
 744         hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
 745         if (skb->len < len_rthdr + 2 ||
 746             skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
 747                 return 0; /* doesn't matter, frame will be dropped */
 748
 749         return ieee80211_select_queue_80211(sdata, skb, hdr);
 750 }
 751
 752 static const struct net_device_ops ieee80211_monitorif_ops = {
 753         .ndo_open               = ieee80211_open,
 754         .ndo_stop               = ieee80211_stop,
 755         .ndo_uninit             = ieee80211_uninit,
 756         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 757         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 758         .ndo_set_mac_address    = ieee80211_change_mac,
 759         .ndo_select_queue       = ieee80211_monitor_select_queue,
 760         .ndo_get_stats64        = ieee80211_get_stats64,
 761 };
 762
 763 static const struct net_device_ops ieee80211_dataif_8023_ops = {
 764         .ndo_open               = ieee80211_open,
 765         .ndo_stop               = ieee80211_stop,
 766         .ndo_uninit             = ieee80211_uninit,
 767         .ndo_start_xmit         = ieee80211_subif_start_xmit_8023,
 768         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 769         .ndo_set_mac_address    = ieee80211_change_mac,
 770         .ndo_select_queue       = ieee80211_netdev_select_queue,
 771         .ndo_get_stats64        = ieee80211_get_stats64,
 772 };
 773
 774 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)
 775 {
 776         switch (iftype) {
 777         /* P2P GO and client are mapped to AP/STATION types */
 778         case NL80211_IFTYPE_AP:
 779         case NL80211_IFTYPE_STATION:
 780                 return true;
 781         default:
 782                 return false;
 783         }
 784 }
 785
 786 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
 787 {
 788         struct ieee80211_local *local = sdata->local;
 789         u32 flags;
 790
 791         flags = sdata->vif.offload_flags;
 792
 793         if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
 794             ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
 795                 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
 796
 797                 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
 798                     local->hw.wiphy->frag_threshold != (u32)-1)
 799                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 800
 801                 if (local->monitors)
 802                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 803         } else {
 804                 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 805         }
 806
 807         if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) &&
 808             ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
 809                 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED;
 810
 811                 if (local->monitors)
 812                         flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
 813         } else {
 814                 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
 815         }
 816
 817         if (sdata->vif.offload_flags == flags)
 818                 return false;
 819
 820         sdata->vif.offload_flags = flags;
 821         ieee80211_check_fast_rx_iface(sdata);
 822         return true;
 823 }
 824
 825 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
 826 {
 827         struct ieee80211_local *local = sdata->local;
 828         struct ieee80211_sub_if_data *bss = sdata;
 829         bool enabled;
 830
 831         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 832                 if (!sdata->bss)
 833                         return;
 834
 835                 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
 836         }
 837
 838         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
 839             !ieee80211_iftype_supports_hdr_offload(bss->vif.type))
 840                 return;
 841
 842         enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
 843         if (sdata->wdev.use_4addr &&
 844             !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
 845                 enabled = false;
 846
 847         sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
 848                                            &ieee80211_dataif_ops;
 849 }
 850
 851 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
 852 {
 853         struct ieee80211_local *local = sdata->local;
 854         struct ieee80211_sub_if_data *vsdata;
 855
 856         if (ieee80211_set_sdata_offload_flags(sdata)) {
 857                 drv_update_vif_offload(local, sdata);
 858                 ieee80211_set_vif_encap_ops(sdata);
 859         }
 860
 861         list_for_each_entry(vsdata, &local->interfaces, list) {
 862                 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
 863                     vsdata->bss != &sdata->u.ap)
 864                         continue;
 865
 866                 ieee80211_set_vif_encap_ops(vsdata);
 867         }
 868 }
 869
 870 void ieee80211_recalc_offload(struct ieee80211_local *local)
 871 {
 872         struct ieee80211_sub_if_data *sdata;
 873
 874         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
 875                 return;
 876
 877         mutex_lock(&local->iflist_mtx);
 878
 879         list_for_each_entry(sdata, &local->interfaces, list) {
 880                 if (!ieee80211_sdata_running(sdata))
 881                         continue;
 882
 883                 ieee80211_recalc_sdata_offload(sdata);
 884         }
 885
 886         mutex_unlock(&local->iflist_mtx);
 887 }
 888
 889 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 890                                     const int offset)
 891 {
 892         struct ieee80211_local *local = sdata->local;
 893         u32 flags = sdata->u.mntr.flags;
 894
 895 #define ADJUST(_f, _s)  do {                                    \
 896         if (flags & MONITOR_FLAG_##_f)                          \
 897                 local->fif_##_s += offset;                      \
 898         } while (0)
 899
 900         ADJUST(FCSFAIL, fcsfail);
 901         ADJUST(PLCPFAIL, plcpfail);
 902         ADJUST(CONTROL, control);
 903         ADJUST(CONTROL, pspoll);
 904         ADJUST(OTHER_BSS, other_bss);
 905
 906 #undef ADJUST
 907 }
 908
 909 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 910 {
 911         struct ieee80211_local *local = sdata->local;
 912         int i;
 913
 914         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 915                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
 916                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 917                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 918                         sdata->vif.hw_queue[i] = i;
 919                 else
 920                         sdata->vif.hw_queue[i] = 0;
 921         }
 922         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 923 }
 924
 925 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 926 {
 927         struct ieee80211_sub_if_data *sdata;
 928         int ret;
 929
 930         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 931                 return 0;
 932
 933         ASSERT_RTNL();
 934
 935         if (local->monitor_sdata)
 936                 return 0;
 937
 938         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 939         if (!sdata)
 940                 return -ENOMEM;
 941
 942         /* set up data */
 943         sdata->local = local;
 944         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 945         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 946                  wiphy_name(local->hw.wiphy));
 947         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
 948
 949         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 950
 951         ieee80211_set_default_queues(sdata);
 952
 953         ret = drv_add_interface(local, sdata);
 954         if (WARN_ON(ret)) {
 955                 /* ok .. stupid driver, it asked for this! */
 956                 kfree(sdata);
 957                 return ret;
 958         }
 959
 960         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 961
 962         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 963         if (ret) {
 964                 kfree(sdata);
 965                 return ret;
 966         }
 967
 968         mutex_lock(&local->iflist_mtx);
 969         rcu_assign_pointer(local->monitor_sdata, sdata);
 970         mutex_unlock(&local->iflist_mtx);
 971
 972         mutex_lock(&local->mtx);
 973         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 974                                         IEEE80211_CHANCTX_EXCLUSIVE);
 975         mutex_unlock(&local->mtx);
 976         if (ret) {
 977                 mutex_lock(&local->iflist_mtx);
 978                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
 979                 mutex_unlock(&local->iflist_mtx);
 980                 synchronize_net();
 981                 drv_remove_interface(local, sdata);
 982                 kfree(sdata);
 983                 return ret;
 984         }
 985
 986         skb_queue_head_init(&sdata->skb_queue);
 987         INIT_WORK(&sdata->work, ieee80211_iface_work);
 988
 989         return 0;
 990 }
 991
 992 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 993 {
 994         struct ieee80211_sub_if_data *sdata;
 995
 996         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 997                 return;
 998
 999         ASSERT_RTNL();
1000
1001         mutex_lock(&local->iflist_mtx);
1002
1003         sdata = rcu_dereference_protected(local->monitor_sdata,
1004                                           lockdep_is_held(&local->iflist_mtx));
1005         if (!sdata) {
1006                 mutex_unlock(&local->iflist_mtx);
1007                 return;
1008         }
1009
1010         RCU_INIT_POINTER(local->monitor_sdata, NULL);
1011         mutex_unlock(&local->iflist_mtx);
1012
1013         synchronize_net();
1014
1015         mutex_lock(&local->mtx);
1016         ieee80211_vif_release_channel(sdata);
1017         mutex_unlock(&local->mtx);
1018
1019         drv_remove_interface(local, sdata);
1020
1021         kfree(sdata);
1022 }
1023
1024 /*
1025  * NOTE: Be very careful when changing this function, it must NOT return
1026  * an error on interface type changes that have been pre-checked, so most
1027  * checks should be in ieee80211_check_concurrent_iface.
1028  */
1029 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1030 {
1031         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1032         struct net_device *dev = wdev->netdev;
1033         struct ieee80211_local *local = sdata->local;
1034         u32 changed = 0;
1035         int res;
1036         u32 hw_reconf_flags = 0;
1037
1038         switch (sdata->vif.type) {
1039         case NL80211_IFTYPE_AP_VLAN: {
1040                 struct ieee80211_sub_if_data *master;
1041
1042                 if (!sdata->bss)
1043                         return -ENOLINK;
1044
1045                 mutex_lock(&local->mtx);
1046                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1047                 mutex_unlock(&local->mtx);
1048
1049                 master = container_of(sdata->bss,
1050                                       struct ieee80211_sub_if_data, u.ap);
1051                 sdata->control_port_protocol =
1052                         master->control_port_protocol;
1053                 sdata->control_port_no_encrypt =
1054                         master->control_port_no_encrypt;
1055                 sdata->control_port_over_nl80211 =
1056                         master->control_port_over_nl80211;
1057                 sdata->control_port_no_preauth =
1058                         master->control_port_no_preauth;
1059                 sdata->vif.cab_queue = master->vif.cab_queue;
1060                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1061                        sizeof(sdata->vif.hw_queue));
1062                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1063
1064                 mutex_lock(&local->key_mtx);
1065                 sdata->crypto_tx_tailroom_needed_cnt +=
1066                         master->crypto_tx_tailroom_needed_cnt;
1067                 mutex_unlock(&local->key_mtx);
1068
1069                 break;
1070                 }
1071         case NL80211_IFTYPE_AP:
1072                 sdata->bss = &sdata->u.ap;
1073                 break;
1074         case NL80211_IFTYPE_MESH_POINT:
1075         case NL80211_IFTYPE_STATION:
1076         case NL80211_IFTYPE_MONITOR:
1077         case NL80211_IFTYPE_ADHOC:
1078         case NL80211_IFTYPE_P2P_DEVICE:
1079         case NL80211_IFTYPE_OCB:
1080         case NL80211_IFTYPE_NAN:
1081                 /* no special treatment */
1082                 break;
1083         case NL80211_IFTYPE_UNSPECIFIED:
1084         case NUM_NL80211_IFTYPES:
1085         case NL80211_IFTYPE_P2P_CLIENT:
1086         case NL80211_IFTYPE_P2P_GO:
1087         case NL80211_IFTYPE_WDS:
1088                 /* cannot happen */
1089                 WARN_ON(1);
1090                 break;
1091         }
1092
1093         if (local->open_count == 0) {
1094                 res = drv_start(local);
1095                 if (res)
1096                         goto err_del_bss;
1097                 /* we're brought up, everything changes */
1098                 hw_reconf_flags = ~0;
1099                 ieee80211_led_radio(local, true);
1100                 ieee80211_mod_tpt_led_trig(local,
1101                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1102         }
1103
1104         /*
1105          * Copy the hopefully now-present MAC address to
1106          * this interface, if it has the special null one.
1107          */
1108         if (dev && is_zero_ether_addr(dev->dev_addr)) {
1109                 memcpy(dev->dev_addr,
1110                        local->hw.wiphy->perm_addr,
1111                        ETH_ALEN);
1112                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1113
1114                 if (!is_valid_ether_addr(dev->dev_addr)) {
1115                         res = -EADDRNOTAVAIL;
1116                         goto err_stop;
1117                 }
1118         }
1119
1120         switch (sdata->vif.type) {
1121         case NL80211_IFTYPE_AP_VLAN:
1122                 /* no need to tell driver, but set carrier and chanctx */
1123                 if (rtnl_dereference(sdata->bss->beacon)) {
1124                         ieee80211_vif_vlan_copy_chanctx(sdata);
1125                         netif_carrier_on(dev);
1126                         ieee80211_set_vif_encap_ops(sdata);
1127                 } else {
1128                         netif_carrier_off(dev);
1129                 }
1130                 break;
1131         case NL80211_IFTYPE_MONITOR:
1132                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1133                         local->cooked_mntrs++;
1134                         break;
1135                 }
1136
1137                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1138                         res = drv_add_interface(local, sdata);
1139                         if (res)
1140                                 goto err_stop;
1141                 } else if (local->monitors == 0 && local->open_count == 0) {
1142                         res = ieee80211_add_virtual_monitor(local);
1143                         if (res)
1144                                 goto err_stop;
1145                 }
1146
1147                 /* must be before the call to ieee80211_configure_filter */
1148                 local->monitors++;
1149                 if (local->monitors == 1) {
1150                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1151                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1152                 }
1153
1154                 ieee80211_adjust_monitor_flags(sdata, 1);
1155                 ieee80211_configure_filter(local);
1156                 ieee80211_recalc_offload(local);
1157                 mutex_lock(&local->mtx);
1158                 ieee80211_recalc_idle(local);
1159                 mutex_unlock(&local->mtx);
1160
1161                 netif_carrier_on(dev);
1162                 break;
1163         default:
1164                 if (coming_up) {
1165                         ieee80211_del_virtual_monitor(local);
1166                         ieee80211_set_sdata_offload_flags(sdata);
1167
1168                         res = drv_add_interface(local, sdata);
1169                         if (res)
1170                                 goto err_stop;
1171
1172                         ieee80211_set_vif_encap_ops(sdata);
1173                         res = ieee80211_check_queues(sdata,
1174                                 ieee80211_vif_type_p2p(&sdata->vif));
1175                         if (res)
1176                                 goto err_del_interface;
1177                 }
1178
1179                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1180                         local->fif_pspoll++;
1181                         local->fif_probe_req++;
1182
1183                         ieee80211_configure_filter(local);
1184                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1185                         local->fif_probe_req++;
1186                 }
1187
1188                 if (sdata->vif.probe_req_reg)
1189                         drv_config_iface_filter(local, sdata,
1190                                                 FIF_PROBE_REQ,
1191                                                 FIF_PROBE_REQ);
1192
1193                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1194                     sdata->vif.type != NL80211_IFTYPE_NAN)
1195                         changed |= ieee80211_reset_erp_info(sdata);
1196                 ieee80211_bss_info_change_notify(sdata, changed);
1197
1198                 switch (sdata->vif.type) {
1199                 case NL80211_IFTYPE_STATION:
1200                 case NL80211_IFTYPE_ADHOC:
1201                 case NL80211_IFTYPE_AP:
1202                 case NL80211_IFTYPE_MESH_POINT:
1203                 case NL80211_IFTYPE_OCB:
1204                         netif_carrier_off(dev);
1205                         break;
1206                 case NL80211_IFTYPE_P2P_DEVICE:
1207                 case NL80211_IFTYPE_NAN:
1208                         break;
1209                 default:
1210                         /* not reached */
1211                         WARN_ON(1);
1212                 }
1213
1214                 /*
1215                  * Set default queue parameters so drivers don't
1216                  * need to initialise the hardware if the hardware
1217                  * doesn't start up with sane defaults.
1218                  * Enable QoS for anything but station interfaces.
1219                  */
1220                 ieee80211_set_wmm_default(sdata, true,
1221                         sdata->vif.type != NL80211_IFTYPE_STATION);
1222         }
1223
1224         set_bit(SDATA_STATE_RUNNING, &sdata->state);
1225
1226         switch (sdata->vif.type) {
1227         case NL80211_IFTYPE_P2P_DEVICE:
1228                 rcu_assign_pointer(local->p2p_sdata, sdata);
1229                 break;
1230         case NL80211_IFTYPE_MONITOR:
1231                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1232                         break;
1233                 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1234                 break;
1235         default:
1236                 break;
1237         }
1238
1239         /*
1240          * set_multicast_list will be invoked by the networking core
1241          * which will check whether any increments here were done in
1242          * error and sync them down to the hardware as filter flags.
1243          */
1244         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1245                 atomic_inc(&local->iff_allmultis);
1246
1247         if (coming_up)
1248                 local->open_count++;
1249
1250         if (hw_reconf_flags)
1251                 ieee80211_hw_config(local, hw_reconf_flags);
1252
1253         ieee80211_recalc_ps(local);
1254
1255         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1256             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1257             local->ops->wake_tx_queue) {
1258                 /* XXX: for AP_VLAN, actually track AP queues */
1259                 if (dev)
1260                         netif_tx_start_all_queues(dev);
1261         } else if (dev) {
1262                 unsigned long flags;
1263                 int n_acs = IEEE80211_NUM_ACS;
1264                 int ac;
1265
1266                 if (local->hw.queues < IEEE80211_NUM_ACS)
1267                         n_acs = 1;
1268
1269                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1270                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
1271                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
1272                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
1273                         for (ac = 0; ac < n_acs; ac++) {
1274                                 int ac_queue = sdata->vif.hw_queue[ac];
1275
1276                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
1277                                     skb_queue_empty(&local->pending[ac_queue]))
1278                                         netif_start_subqueue(dev, ac);
1279                         }
1280                 }
1281                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1282         }
1283
1284         return 0;
1285  err_del_interface:
1286         drv_remove_interface(local, sdata);
1287  err_stop:
1288         if (!local->open_count)
1289                 drv_stop(local);
1290  err_del_bss:
1291         sdata->bss = NULL;
1292         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1293                 mutex_lock(&local->mtx);
1294                 list_del(&sdata->u.vlan.list);
1295                 mutex_unlock(&local->mtx);
1296         }
1297         /* might already be clear but that doesn't matter */
1298         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1299         return res;
1300 }
1301
1302 static void ieee80211_if_free(struct net_device *dev)
1303 {
1304         free_percpu(dev->tstats);
1305 }
1306
1307 static void ieee80211_if_setup(struct net_device *dev)
1308 {
1309         ether_setup(dev);
1310         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1311         dev->netdev_ops = &ieee80211_dataif_ops;
1312         dev->needs_free_netdev = true;
1313         dev->priv_destructor = ieee80211_if_free;
1314 }
1315
1316 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1317 {
1318         ieee80211_if_setup(dev);
1319         dev->priv_flags |= IFF_NO_QUEUE;
1320 }
1321
1322 static void ieee80211_iface_work(struct work_struct *work)
1323 {
1324         struct ieee80211_sub_if_data *sdata =
1325                 container_of(work, struct ieee80211_sub_if_data, work);
1326         struct ieee80211_local *local = sdata->local;
1327         struct sk_buff *skb;
1328         struct sta_info *sta;
1329
1330         if (!ieee80211_sdata_running(sdata))
1331                 return;
1332
1333         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1334                 return;
1335
1336         if (!ieee80211_can_run_worker(local))
1337                 return;
1338
1339         /* first process frames */
1340         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1341                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1342
1343                 kcov_remote_start_common(skb_get_kcov_handle(skb));
1344                 if (ieee80211_is_action(mgmt->frame_control) &&
1345                     mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1346                         int len = skb->len;
1347
1348                         mutex_lock(&local->sta_mtx);
1349                         sta = sta_info_get_bss(sdata, mgmt->sa);
1350                         if (sta) {
1351                                 switch (mgmt->u.action.u.addba_req.action_code) {
1352                                 case WLAN_ACTION_ADDBA_REQ:
1353                                         ieee80211_process_addba_request(
1354                                                         local, sta, mgmt, len);
1355                                         break;
1356                                 case WLAN_ACTION_ADDBA_RESP:
1357                                         ieee80211_process_addba_resp(local, sta,
1358                                                                      mgmt, len);
1359                                         break;
1360                                 case WLAN_ACTION_DELBA:
1361                                         ieee80211_process_delba(sdata, sta,
1362                                                                 mgmt, len);
1363                                         break;
1364                                 default:
1365                                         WARN_ON(1);
1366                                         break;
1367                                 }
1368                         }
1369                         mutex_unlock(&local->sta_mtx);
1370                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1371                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1372                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1373                         case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1374                                 struct ieee80211_rx_status *status;
1375                                 enum nl80211_band band;
1376                                 u8 opmode;
1377
1378                                 status = IEEE80211_SKB_RXCB(skb);
1379                                 band = status->band;
1380                                 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1381
1382                                 mutex_lock(&local->sta_mtx);
1383                                 sta = sta_info_get_bss(sdata, mgmt->sa);
1384
1385                                 if (sta)
1386                                         ieee80211_vht_handle_opmode(sdata, sta,
1387                                                                     opmode,
1388                                                                     band);
1389
1390                                 mutex_unlock(&local->sta_mtx);
1391                                 break;
1392                         }
1393                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1394                                 ieee80211_process_mu_groups(sdata, mgmt);
1395                                 break;
1396                         default:
1397                                 WARN_ON(1);
1398                                 break;
1399                         }
1400                 } else if (ieee80211_is_ext(mgmt->frame_control)) {
1401                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
1402                                 ieee80211_sta_rx_queued_ext(sdata, skb);
1403                         else
1404                                 WARN_ON(1);
1405                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1406                         struct ieee80211_hdr *hdr = (void *)mgmt;
1407                         /*
1408                          * So the frame isn't mgmt, but frame_control
1409                          * is at the right place anyway, of course, so
1410                          * the if statement is correct.
1411                          *
1412                          * Warn if we have other data frame types here,
1413                          * they must not get here.
1414                          */
1415                         WARN_ON(hdr->frame_control &
1416                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1417                         WARN_ON(!(hdr->seq_ctrl &
1418                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1419                         /*
1420                          * This was a fragment of a frame, received while
1421                          * a block-ack session was active. That cannot be
1422                          * right, so terminate the session.
1423                          */
1424                         mutex_lock(&local->sta_mtx);
1425                         sta = sta_info_get_bss(sdata, mgmt->sa);
1426                         if (sta) {
1427                                 u16 tid = ieee80211_get_tid(hdr);
1428
1429                                 __ieee80211_stop_rx_ba_session(
1430                                         sta, tid, WLAN_BACK_RECIPIENT,
1431                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1432                                         true);
1433                         }
1434                         mutex_unlock(&local->sta_mtx);
1435                 } else switch (sdata->vif.type) {
1436                 case NL80211_IFTYPE_STATION:
1437                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1438                         break;
1439                 case NL80211_IFTYPE_ADHOC:
1440                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1441                         break;
1442                 case NL80211_IFTYPE_MESH_POINT:
1443                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1444                                 break;
1445                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1446                         break;
1447                 default:
1448                         WARN(1, "frame for unexpected interface type");
1449                         break;
1450                 }
1451
1452                 kfree_skb(skb);
1453                 kcov_remote_stop();
1454         }
1455
1456         /* then other type-dependent work */
1457         switch (sdata->vif.type) {
1458         case NL80211_IFTYPE_STATION:
1459                 ieee80211_sta_work(sdata);
1460                 break;
1461         case NL80211_IFTYPE_ADHOC:
1462                 ieee80211_ibss_work(sdata);
1463                 break;
1464         case NL80211_IFTYPE_MESH_POINT:
1465                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1466                         break;
1467                 ieee80211_mesh_work(sdata);
1468                 break;
1469         case NL80211_IFTYPE_OCB:
1470                 ieee80211_ocb_work(sdata);
1471                 break;
1472         default:
1473                 break;
1474         }
1475 }
1476
1477 static void ieee80211_recalc_smps_work(struct work_struct *work)
1478 {
1479         struct ieee80211_sub_if_data *sdata =
1480                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1481
1482         ieee80211_recalc_smps(sdata);
1483 }
1484
1485 /*
1486  * Helper function to initialise an interface to a specific type.
1487  */
1488 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1489                                   enum nl80211_iftype type)
1490 {
1491         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1492                                                     0xff, 0xff, 0xff};
1493
1494         /* clear type-dependent union */
1495         memset(&sdata->u, 0, sizeof(sdata->u));
1496
1497         /* and set some type-dependent values */
1498         sdata->vif.type = type;
1499         sdata->vif.p2p = false;
1500         sdata->wdev.iftype = type;
1501
1502         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1503         sdata->control_port_no_encrypt = false;
1504         sdata->control_port_over_nl80211 = false;
1505         sdata->control_port_no_preauth = false;
1506         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1507         sdata->vif.bss_conf.idle = true;
1508         sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1509
1510         sdata->noack_map = 0;
1511
1512         /* only monitor/p2p-device differ */
1513         if (sdata->dev) {
1514                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1515                 sdata->dev->type = ARPHRD_ETHER;
1516         }
1517
1518         skb_queue_head_init(&sdata->skb_queue);
1519         INIT_WORK(&sdata->work, ieee80211_iface_work);
1520         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1521         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1522         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1523         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1524
1525         switch (type) {
1526         case NL80211_IFTYPE_P2P_GO:
1527                 type = NL80211_IFTYPE_AP;
1528                 sdata->vif.type = type;
1529                 sdata->vif.p2p = true;
1530                 fallthrough;
1531         case NL80211_IFTYPE_AP:
1532                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1533                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1534                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1535                 break;
1536         case NL80211_IFTYPE_P2P_CLIENT:
1537                 type = NL80211_IFTYPE_STATION;
1538                 sdata->vif.type = type;
1539                 sdata->vif.p2p = true;
1540                 fallthrough;
1541         case NL80211_IFTYPE_STATION:
1542                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1543                 ieee80211_sta_setup_sdata(sdata);
1544                 break;
1545         case NL80211_IFTYPE_OCB:
1546                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1547                 ieee80211_ocb_setup_sdata(sdata);
1548                 break;
1549         case NL80211_IFTYPE_ADHOC:
1550                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1551                 ieee80211_ibss_setup_sdata(sdata);
1552                 break;
1553         case NL80211_IFTYPE_MESH_POINT:
1554                 if (ieee80211_vif_is_mesh(&sdata->vif))
1555                         ieee80211_mesh_init_sdata(sdata);
1556                 break;
1557         case NL80211_IFTYPE_MONITOR:
1558                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1559                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1560                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1561                                       MONITOR_FLAG_OTHER_BSS;
1562                 break;
1563         case NL80211_IFTYPE_NAN:
1564                 idr_init(&sdata->u.nan.function_inst_ids);
1565                 spin_lock_init(&sdata->u.nan.func_lock);
1566                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1567                 break;
1568         case NL80211_IFTYPE_AP_VLAN:
1569         case NL80211_IFTYPE_P2P_DEVICE:
1570                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1571                 break;
1572         case NL80211_IFTYPE_UNSPECIFIED:
1573         case NL80211_IFTYPE_WDS:
1574         case NUM_NL80211_IFTYPES:
1575                 WARN_ON(1);
1576                 break;
1577         }
1578
1579         ieee80211_debugfs_add_netdev(sdata);
1580 }
1581
1582 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1583                                            enum nl80211_iftype type)
1584 {
1585         struct ieee80211_local *local = sdata->local;
1586         int ret, err;
1587         enum nl80211_iftype internal_type = type;
1588         bool p2p = false;
1589
1590         ASSERT_RTNL();
1591
1592         if (!local->ops->change_interface)
1593                 return -EBUSY;
1594
1595         switch (sdata->vif.type) {
1596         case NL80211_IFTYPE_AP:
1597         case NL80211_IFTYPE_STATION:
1598         case NL80211_IFTYPE_ADHOC:
1599         case NL80211_IFTYPE_OCB:
1600                 /*
1601                  * Could maybe also all others here?
1602                  * Just not sure how that interacts
1603                  * with the RX/config path e.g. for
1604                  * mesh.
1605                  */
1606                 break;
1607         default:
1608                 return -EBUSY;
1609         }
1610
1611         switch (type) {
1612         case NL80211_IFTYPE_AP:
1613         case NL80211_IFTYPE_STATION:
1614         case NL80211_IFTYPE_ADHOC:
1615         case NL80211_IFTYPE_OCB:
1616                 /*
1617                  * Could probably support everything
1618                  * but here.
1619                  */
1620                 break;
1621         case NL80211_IFTYPE_P2P_CLIENT:
1622                 p2p = true;
1623                 internal_type = NL80211_IFTYPE_STATION;
1624                 break;
1625         case NL80211_IFTYPE_P2P_GO:
1626                 p2p = true;
1627                 internal_type = NL80211_IFTYPE_AP;
1628                 break;
1629         default:
1630                 return -EBUSY;
1631         }
1632
1633         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1634         if (ret)
1635                 return ret;
1636
1637         ieee80211_stop_vif_queues(local, sdata,
1638                                   IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1639         synchronize_net();
1640
1641         ieee80211_do_stop(sdata, false);
1642
1643         ieee80211_teardown_sdata(sdata);
1644
1645         ieee80211_set_sdata_offload_flags(sdata);
1646         ret = drv_change_interface(local, sdata, internal_type, p2p);
1647         if (ret)
1648                 type = ieee80211_vif_type_p2p(&sdata->vif);
1649
1650         /*
1651          * Ignore return value here, there's not much we can do since
1652          * the driver changed the interface type internally already.
1653          * The warnings will hopefully make driver authors fix it :-)
1654          */
1655         ieee80211_check_queues(sdata, type);
1656
1657         ieee80211_setup_sdata(sdata, type);
1658         ieee80211_set_vif_encap_ops(sdata);
1659
1660         err = ieee80211_do_open(&sdata->wdev, false);
1661         WARN(err, "type change: do_open returned %d", err);
1662
1663         ieee80211_wake_vif_queues(local, sdata,
1664                                   IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1665         return ret;
1666 }
1667
1668 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1669                              enum nl80211_iftype type)
1670 {
1671         int ret;
1672
1673         ASSERT_RTNL();
1674
1675         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1676                 return 0;
1677
1678         if (ieee80211_sdata_running(sdata)) {
1679                 ret = ieee80211_runtime_change_iftype(sdata, type);
1680                 if (ret)
1681                         return ret;
1682         } else {
1683                 /* Purge and reset type-dependent state. */
1684                 ieee80211_teardown_sdata(sdata);
1685                 ieee80211_setup_sdata(sdata, type);
1686         }
1687
1688         /* reset some values that shouldn't be kept across type changes */
1689         if (type == NL80211_IFTYPE_STATION)
1690                 sdata->u.mgd.use_4addr = false;
1691
1692         return 0;
1693 }
1694
1695 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1696                                        u8 *perm_addr, enum nl80211_iftype type)
1697 {
1698         struct ieee80211_sub_if_data *sdata;
1699         u64 mask, start, addr, val, inc;
1700         u8 *m;
1701         u8 tmp_addr[ETH_ALEN];
1702         int i;
1703
1704         /* default ... something at least */
1705         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1706
1707         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1708             local->hw.wiphy->n_addresses <= 1)
1709                 return;
1710
1711         mutex_lock(&local->iflist_mtx);
1712
1713         switch (type) {
1714         case NL80211_IFTYPE_MONITOR:
1715                 /* doesn't matter */
1716                 break;
1717         case NL80211_IFTYPE_AP_VLAN:
1718                 /* match up with an AP interface */
1719                 list_for_each_entry(sdata, &local->interfaces, list) {
1720                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1721                                 continue;
1722                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1723                         break;
1724                 }
1725                 /* keep default if no AP interface present */
1726                 break;
1727         case NL80211_IFTYPE_P2P_CLIENT:
1728         case NL80211_IFTYPE_P2P_GO:
1729                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1730                         list_for_each_entry(sdata, &local->interfaces, list) {
1731                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1732                                         continue;
1733                                 if (!ieee80211_sdata_running(sdata))
1734                                         continue;
1735                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1736                                 goto out_unlock;
1737                         }
1738                 }
1739                 fallthrough;
1740         default:
1741                 /* assign a new address if possible -- try n_addresses first */
1742                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1743                         bool used = false;
1744
1745                         list_for_each_entry(sdata, &local->interfaces, list) {
1746                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1747                                                      sdata->vif.addr)) {
1748                                         used = true;
1749                                         break;
1750                                 }
1751                         }
1752
1753                         if (!used) {
1754                                 memcpy(perm_addr,
1755                                        local->hw.wiphy->addresses[i].addr,
1756                                        ETH_ALEN);
1757                                 break;
1758                         }
1759                 }
1760
1761                 /* try mask if available */
1762                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1763                         break;
1764
1765                 m = local->hw.wiphy->addr_mask;
1766                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1767                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1768                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1769
1770                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1771                         /* not a contiguous mask ... not handled now! */
1772                         pr_info("not contiguous\n");
1773                         break;
1774                 }
1775
1776                 /*
1777                  * Pick address of existing interface in case user changed
1778                  * MAC address manually, default to perm_addr.
1779                  */
1780                 m = local->hw.wiphy->perm_addr;
1781                 list_for_each_entry(sdata, &local->interfaces, list) {
1782                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1783                                 continue;
1784                         m = sdata->vif.addr;
1785                         break;
1786                 }
1787                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1788                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1789                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1790
1791                 inc = 1ULL<<__ffs64(mask);
1792                 val = (start & mask);
1793                 addr = (start & ~mask) | (val & mask);
1794                 do {
1795                         bool used = false;
1796
1797                         tmp_addr[5] = addr >> 0*8;
1798                         tmp_addr[4] = addr >> 1*8;
1799                         tmp_addr[3] = addr >> 2*8;
1800                         tmp_addr[2] = addr >> 3*8;
1801                         tmp_addr[1] = addr >> 4*8;
1802                         tmp_addr[0] = addr >> 5*8;
1803
1804                         val += inc;
1805
1806                         list_for_each_entry(sdata, &local->interfaces, list) {
1807                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1808                                         used = true;
1809                                         break;
1810                                 }
1811                         }
1812
1813                         if (!used) {
1814                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1815                                 break;
1816                         }
1817                         addr = (start & ~mask) | (val & mask);
1818                 } while (addr != start);
1819
1820                 break;
1821         }
1822
1823  out_unlock:
1824         mutex_unlock(&local->iflist_mtx);
1825 }
1826
1827 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1828                      unsigned char name_assign_type,
1829                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1830                      struct vif_params *params)
1831 {
1832         struct net_device *ndev = NULL;
1833         struct ieee80211_sub_if_data *sdata = NULL;
1834         struct txq_info *txqi;
1835         void (*if_setup)(struct net_device *dev);
1836         int ret, i;
1837         int txqs = 1;
1838
1839         ASSERT_RTNL();
1840
1841         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1842                 struct wireless_dev *wdev;
1843
1844                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1845                                 GFP_KERNEL);
1846                 if (!sdata)
1847                         return -ENOMEM;
1848                 wdev = &sdata->wdev;
1849
1850                 sdata->dev = NULL;
1851                 strlcpy(sdata->name, name, IFNAMSIZ);
1852                 ieee80211_assign_perm_addr(local, wdev->address, type);
1853                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1854         } else {
1855                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1856                                  sizeof(void *));
1857                 int txq_size = 0;
1858
1859                 if (local->ops->wake_tx_queue &&
1860                     type != NL80211_IFTYPE_AP_VLAN &&
1861                     (type != NL80211_IFTYPE_MONITOR ||
1862                      (params->flags & MONITOR_FLAG_ACTIVE)))
1863                         txq_size += sizeof(struct txq_info) +
1864                                     local->hw.txq_data_size;
1865
1866                 if (local->ops->wake_tx_queue) {
1867                         if_setup = ieee80211_if_setup_no_queue;
1868                 } else {
1869                         if_setup = ieee80211_if_setup;
1870                         if (local->hw.queues >= IEEE80211_NUM_ACS)
1871                                 txqs = IEEE80211_NUM_ACS;
1872                 }
1873
1874                 ndev = alloc_netdev_mqs(size + txq_size,
1875                                         name, name_assign_type,
1876                                         if_setup, txqs, 1);
1877                 if (!ndev)
1878                         return -ENOMEM;
1879
1880                 if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len)
1881                         ndev->tx_queue_len = local->hw.wiphy->tx_queue_len;
1882
1883                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1884
1885                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1886                 if (!ndev->tstats) {
1887                         free_netdev(ndev);
1888                         return -ENOMEM;
1889                 }
1890
1891                 ndev->needed_headroom = local->tx_headroom +
1892                                         4*6 /* four MAC addresses */
1893                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1894                                         + 6 /* mesh */
1895                                         + 8 /* rfc1042/bridge tunnel */
1896                                         - ETH_HLEN /* ethernet hard_header_len */
1897                                         + IEEE80211_ENCRYPT_HEADROOM;
1898                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1899
1900                 ret = dev_alloc_name(ndev, ndev->name);
1901                 if (ret < 0) {
1902                         ieee80211_if_free(ndev);
1903                         free_netdev(ndev);
1904                         return ret;
1905                 }
1906
1907                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1908                 if (is_valid_ether_addr(params->macaddr))
1909                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1910                 else
1911                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1912                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1913
1914                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1915                 sdata = netdev_priv(ndev);
1916                 ndev->ieee80211_ptr = &sdata->wdev;
1917                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1918                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1919
1920                 if (txq_size) {
1921                         txqi = netdev_priv(ndev) + size;
1922                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1923                 }
1924
1925                 sdata->dev = ndev;
1926         }
1927
1928         /* initialise type-independent data */
1929         sdata->wdev.wiphy = local->hw.wiphy;
1930         sdata->local = local;
1931
1932         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1933                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1934
1935         INIT_LIST_HEAD(&sdata->key_list);
1936
1937         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1938                           ieee80211_dfs_cac_timer_work);
1939         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1940                           ieee80211_delayed_tailroom_dec);
1941
1942         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1943                 struct ieee80211_supported_band *sband;
1944                 sband = local->hw.wiphy->bands[i];
1945                 sdata->rc_rateidx_mask[i] =
1946                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1947                 if (sband) {
1948                         __le16 cap;
1949                         u16 *vht_rate_mask;
1950
1951                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1952                                sband->ht_cap.mcs.rx_mask,
1953                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1954
1955                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1956                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1957                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1958                 } else {
1959                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1960                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1961                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1962                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1963                 }
1964         }
1965
1966         ieee80211_set_default_queues(sdata);
1967
1968         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1969         sdata->user_power_level = local->user_power_level;
1970
1971         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1972
1973         /* setup type-dependent data */
1974         ieee80211_setup_sdata(sdata, type);
1975
1976         if (ndev) {
1977                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1978                 if (type == NL80211_IFTYPE_STATION)
1979                         sdata->u.mgd.use_4addr = params->use_4addr;
1980
1981                 ndev->features |= local->hw.netdev_features;
1982                 ndev->hw_features |= ndev->features &
1983                                         MAC80211_SUPPORTED_FEATURES_TX;
1984
1985                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1986
1987                 /* MTU range: 256 - 2304 */
1988                 ndev->min_mtu = 256;
1989                 ndev->max_mtu = local->hw.max_mtu;
1990
1991                 ret = cfg80211_register_netdevice(ndev);
1992                 if (ret) {
1993                         free_netdev(ndev);
1994                         return ret;
1995                 }
1996         }
1997
1998         mutex_lock(&local->iflist_mtx);
1999         list_add_tail_rcu(&sdata->list, &local->interfaces);
2000         mutex_unlock(&local->iflist_mtx);
2001
2002         if (new_wdev)
2003                 *new_wdev = &sdata->wdev;
2004
2005         return 0;
2006 }
2007
2008 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2009 {
2010         ASSERT_RTNL();
2011
2012         mutex_lock(&sdata->local->iflist_mtx);
2013         list_del_rcu(&sdata->list);
2014         mutex_unlock(&sdata->local->iflist_mtx);
2015
2016         if (sdata->vif.txq)
2017                 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2018
2019         synchronize_rcu();
2020
2021         cfg80211_unregister_wdev(&sdata->wdev);
2022
2023         if (!sdata->dev) {
2024                 ieee80211_teardown_sdata(sdata);
2025                 kfree(sdata);
2026         }
2027 }
2028
2029 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2030 {
2031         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2032                 return;
2033         ieee80211_do_stop(sdata, true);
2034 }
2035
2036 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2037 {
2038         struct ieee80211_sub_if_data *sdata, *tmp;
2039         LIST_HEAD(unreg_list);
2040         LIST_HEAD(wdev_list);
2041
2042         ASSERT_RTNL();
2043
2044         /* Before destroying the interfaces, make sure they're all stopped so
2045          * that the hardware is stopped. Otherwise, the driver might still be
2046          * iterating the interfaces during the shutdown, e.g. from a worker
2047          * or from RX processing or similar, and if it does so (using atomic
2048          * iteration) while we're manipulating the list, the iteration will
2049          * crash.
2050          *
2051          * After this, the hardware should be stopped and the driver should
2052          * have stopped all of its activities, so that we can do RCU-unaware
2053          * manipulations of the interface list below.
2054          */
2055         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2056
2057         WARN(local->open_count, "%s: open count remains %d\n",
2058              wiphy_name(local->hw.wiphy), local->open_count);
2059
2060         ieee80211_txq_teardown_flows(local);
2061
2062         mutex_lock(&local->iflist_mtx);
2063         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
2064                 list_del(&sdata->list);
2065
2066                 if (sdata->dev)
2067                         unregister_netdevice_queue(sdata->dev, &unreg_list);
2068                 else
2069                         list_add(&sdata->list, &wdev_list);
2070         }
2071         mutex_unlock(&local->iflist_mtx);
2072
2073         unregister_netdevice_many(&unreg_list);
2074
2075         wiphy_lock(local->hw.wiphy);
2076         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2077                 list_del(&sdata->list);
2078                 cfg80211_unregister_wdev(&sdata->wdev);
2079                 kfree(sdata);
2080         }
2081         wiphy_unlock(local->hw.wiphy);
2082 }
2083
2084 static int netdev_notify(struct notifier_block *nb,
2085                          unsigned long state, void *ptr)
2086 {
2087         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2088         struct ieee80211_sub_if_data *sdata;
2089
2090         if (state != NETDEV_CHANGENAME)
2091                 return NOTIFY_DONE;
2092
2093         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2094                 return NOTIFY_DONE;
2095
2096         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2097                 return NOTIFY_DONE;
2098
2099         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2100         memcpy(sdata->name, dev->name, IFNAMSIZ);
2101         ieee80211_debugfs_rename_netdev(sdata);
2102
2103         return NOTIFY_OK;
2104 }
2105
2106 static struct notifier_block mac80211_netdev_notifier = {
2107         .notifier_call = netdev_notify,
2108 };
2109
2110 int ieee80211_iface_init(void)
2111 {
2112         return register_netdevice_notifier(&mac80211_netdev_notifier);
2113 }
2114
2115 void ieee80211_iface_exit(void)
2116 {
2117         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2118 }
2119
2120 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2121 {
2122         if (sdata->vif.type == NL80211_IFTYPE_AP)
2123                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2124         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2125                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2126 }
2127
2128 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2129 {
2130         if (sdata->vif.type == NL80211_IFTYPE_AP)
2131                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2132         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2133                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2134 }