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 <net/mac80211.h>
  19 #include <net/ieee80211_radiotap.h>
  20 #include "ieee80211_i.h"
  21 #include "sta_info.h"
  22 #include "debugfs_netdev.h"
  23 #include "mesh.h"
  24 #include "led.h"
  25 #include "driver-ops.h"
  26 #include "wme.h"
  27 #include "rate.h"
  28
  29 /**
  30  * DOC: Interface list locking
  31  *
  32  * The interface list in each struct ieee80211_local is protected
  33  * three-fold:
  34  *
  35  * (1) modifications may only be done under the RTNL
  36  * (2) modifications and readers are protected against each other by
  37  *     the iflist_mtx.
  38  * (3) modifications are done in an RCU manner so atomic readers
  39  *     can traverse the list in RCU-safe blocks.
  40  *
  41  * As a consequence, reads (traversals) of the list can be protected
  42  * by either the RTNL, the iflist_mtx or RCU.
  43  */
  44
  45 static void ieee80211_iface_work(struct work_struct *work);
  46
  47 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  48 {
  49         struct ieee80211_chanctx_conf *chanctx_conf;
  50         int power;
  51
  52         rcu_read_lock();
  53         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  54         if (!chanctx_conf) {
  55                 rcu_read_unlock();
  56                 return false;
  57         }
  58
  59         power = ieee80211_chandef_max_power(&chanctx_conf->def);
  60         rcu_read_unlock();
  61
  62         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  63                 power = min(power, sdata->user_power_level);
  64
  65         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  66                 power = min(power, sdata->ap_power_level);
  67
  68         if (power != sdata->vif.bss_conf.txpower) {
  69                 sdata->vif.bss_conf.txpower = power;
  70                 ieee80211_hw_config(sdata->local, 0);
  71                 return true;
  72         }
  73
  74         return false;
  75 }
  76
  77 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
  78                               bool update_bss)
  79 {
  80         if (__ieee80211_recalc_txpower(sdata) ||
  81             (update_bss && ieee80211_sdata_running(sdata)))
  82                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  83 }
  84
  85 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
  86 {
  87         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  88                 return 0;
  89
  90         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  91         return IEEE80211_CONF_CHANGE_IDLE;
  92 }
  93
  94 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  95 {
  96         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  97                 return 0;
  98
  99         ieee80211_flush_queues(local, NULL, false);
 100
 101         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 102         return IEEE80211_CONF_CHANGE_IDLE;
 103 }
 104
 105 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
 106                                    bool force_active)
 107 {
 108         bool working, scanning, active;
 109         unsigned int led_trig_start = 0, led_trig_stop = 0;
 110
 111         lockdep_assert_held(&local->mtx);
 112
 113         active = force_active ||
 114                  !list_empty(&local->chanctx_list) ||
 115                  local->monitors;
 116
 117         working = !local->ops->remain_on_channel &&
 118                   !list_empty(&local->roc_list);
 119
 120         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 121                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 122
 123         if (working || scanning)
 124                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 125         else
 126                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 127
 128         if (active)
 129                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 130         else
 131                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 132
 133         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 134
 135         if (working || scanning || active)
 136                 return __ieee80211_idle_off(local);
 137         return __ieee80211_idle_on(local);
 138 }
 139
 140 u32 ieee80211_idle_off(struct ieee80211_local *local)
 141 {
 142         return __ieee80211_recalc_idle(local, true);
 143 }
 144
 145 void ieee80211_recalc_idle(struct ieee80211_local *local)
 146 {
 147         u32 change = __ieee80211_recalc_idle(local, false);
 148         if (change)
 149                 ieee80211_hw_config(local, change);
 150 }
 151
 152 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 153                                 bool check_dup)
 154 {
 155         struct ieee80211_local *local = sdata->local;
 156         struct ieee80211_sub_if_data *iter;
 157         u64 new, mask, tmp;
 158         u8 *m;
 159         int ret = 0;
 160
 161         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 162                 return 0;
 163
 164         m = addr;
 165         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 166                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 167                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 168
 169         m = local->hw.wiphy->addr_mask;
 170         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 171                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 172                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 173
 174         if (!check_dup)
 175                 return ret;
 176
 177         mutex_lock(&local->iflist_mtx);
 178         list_for_each_entry(iter, &local->interfaces, list) {
 179                 if (iter == sdata)
 180                         continue;
 181
 182                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 183                     !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 184                         continue;
 185
 186                 m = iter->vif.addr;
 187                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 188                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 189                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 190
 191                 if ((new & ~mask) != (tmp & ~mask)) {
 192                         ret = -EINVAL;
 193                         break;
 194                 }
 195         }
 196         mutex_unlock(&local->iflist_mtx);
 197
 198         return ret;
 199 }
 200
 201 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 202 {
 203         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 204         struct sockaddr *sa = addr;
 205         bool check_dup = true;
 206         int ret;
 207
 208         if (ieee80211_sdata_running(sdata))
 209                 return -EBUSY;
 210
 211         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 212             !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 213                 check_dup = false;
 214
 215         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 216         if (ret)
 217                 return ret;
 218
 219         ret = eth_mac_addr(dev, sa);
 220
 221         if (ret == 0)
 222                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 223
 224         return ret;
 225 }
 226
 227 static inline int identical_mac_addr_allowed(int type1, int type2)
 228 {
 229         return type1 == NL80211_IFTYPE_MONITOR ||
 230                 type2 == NL80211_IFTYPE_MONITOR ||
 231                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 232                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 233                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 234                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 235                         (type2 == NL80211_IFTYPE_AP ||
 236                          type2 == NL80211_IFTYPE_AP_VLAN));
 237 }
 238
 239 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 240                                             enum nl80211_iftype iftype)
 241 {
 242         struct ieee80211_local *local = sdata->local;
 243         struct ieee80211_sub_if_data *nsdata;
 244         int ret;
 245
 246         ASSERT_RTNL();
 247
 248         /* we hold the RTNL here so can safely walk the list */
 249         list_for_each_entry(nsdata, &local->interfaces, list) {
 250                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 251                         /*
 252                          * Only OCB and monitor mode may coexist
 253                          */
 254                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
 255                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
 256                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 257                              nsdata->vif.type == NL80211_IFTYPE_OCB))
 258                                 return -EBUSY;
 259
 260                         /*
 261                          * Allow only a single IBSS interface to be up at any
 262                          * time. This is restricted because beacon distribution
 263                          * cannot work properly if both are in the same IBSS.
 264                          *
 265                          * To remove this restriction we'd have to disallow them
 266                          * from setting the same SSID on different IBSS interfaces
 267                          * belonging to the same hardware. Then, however, we're
 268                          * faced with having to adopt two different TSF timers...
 269                          */
 270                         if (iftype == NL80211_IFTYPE_ADHOC &&
 271                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 272                                 return -EBUSY;
 273                         /*
 274                          * will not add another interface while any channel
 275                          * switch is active.
 276                          */
 277                         if (nsdata->vif.csa_active)
 278                                 return -EBUSY;
 279
 280                         /*
 281                          * The remaining checks are only performed for interfaces
 282                          * with the same MAC address.
 283                          */
 284                         if (!ether_addr_equal(sdata->vif.addr,
 285                                               nsdata->vif.addr))
 286                                 continue;
 287
 288                         /*
 289                          * check whether it may have the same address
 290                          */
 291                         if (!identical_mac_addr_allowed(iftype,
 292                                                         nsdata->vif.type))
 293                                 return -ENOTUNIQ;
 294
 295                         /*
 296                          * can only add VLANs to enabled APs
 297                          */
 298                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 299                             nsdata->vif.type == NL80211_IFTYPE_AP)
 300                                 sdata->bss = &nsdata->u.ap;
 301                 }
 302         }
 303
 304         mutex_lock(&local->chanctx_mtx);
 305         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
 306         mutex_unlock(&local->chanctx_mtx);
 307         return ret;
 308 }
 309
 310 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 311                                   enum nl80211_iftype iftype)
 312 {
 313         int n_queues = sdata->local->hw.queues;
 314         int i;
 315
 316         if (iftype == NL80211_IFTYPE_NAN)
 317                 return 0;
 318
 319         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 320                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 321                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 322                                          IEEE80211_INVAL_HW_QUEUE))
 323                                 return -EINVAL;
 324                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 325                                          n_queues))
 326                                 return -EINVAL;
 327                 }
 328         }
 329
 330         if ((iftype != NL80211_IFTYPE_AP &&
 331              iftype != NL80211_IFTYPE_P2P_GO &&
 332              iftype != NL80211_IFTYPE_MESH_POINT) ||
 333             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
 334                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 335                 return 0;
 336         }
 337
 338         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 339                 return -EINVAL;
 340
 341         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 342                 return -EINVAL;
 343
 344         return 0;
 345 }
 346
 347 static int ieee80211_open(struct net_device *dev)
 348 {
 349         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 350         int err;
 351
 352         /* fail early if user set an invalid address */
 353         if (!is_valid_ether_addr(dev->dev_addr))
 354                 return -EADDRNOTAVAIL;
 355
 356         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 357         if (err)
 358                 return err;
 359
 360         wiphy_lock(sdata->local->hw.wiphy);
 361         err = ieee80211_do_open(&sdata->wdev, true);
 362         wiphy_unlock(sdata->local->hw.wiphy);
 363
 364         return err;
 365 }
 366
 367 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down)
 368 {
 369         struct ieee80211_local *local = sdata->local;
 370         unsigned long flags;
 371         struct sk_buff *skb, *tmp;
 372         u32 hw_reconf_flags = 0;
 373         int i, flushed;
 374         struct ps_data *ps;
 375         struct cfg80211_chan_def chandef;
 376         bool cancel_scan;
 377         struct cfg80211_nan_func *func;
 378
 379         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 380
 381         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 382         if (cancel_scan)
 383                 ieee80211_scan_cancel(local);
 384
 385         /*
 386          * Stop TX on this interface first.
 387          */
 388         if (sdata->dev)
 389                 netif_tx_stop_all_queues(sdata->dev);
 390
 391         ieee80211_roc_purge(local, sdata);
 392
 393         switch (sdata->vif.type) {
 394         case NL80211_IFTYPE_STATION:
 395                 ieee80211_mgd_stop(sdata);
 396                 break;
 397         case NL80211_IFTYPE_ADHOC:
 398                 ieee80211_ibss_stop(sdata);
 399                 break;
 400         case NL80211_IFTYPE_MONITOR:
 401                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
 402                         break;
 403                 list_del_rcu(&sdata->u.mntr.list);
 404                 break;
 405         default:
 406                 break;
 407         }
 408
 409         /*
 410          * Remove all stations associated with this interface.
 411          *
 412          * This must be done before calling ops->remove_interface()
 413          * because otherwise we can later invoke ops->sta_notify()
 414          * whenever the STAs are removed, and that invalidates driver
 415          * assumptions about always getting a vif pointer that is valid
 416          * (because if we remove a STA after ops->remove_interface()
 417          * the driver will have removed the vif info already!)
 418          *
 419          * For AP_VLANs stations may exist since there's nothing else that
 420          * would have removed them, but in other modes there shouldn't
 421          * be any stations.
 422          */
 423         flushed = sta_info_flush(sdata);
 424         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0);
 425
 426         /* don't count this interface for allmulti while it is down */
 427         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 428                 atomic_dec(&local->iff_allmultis);
 429
 430         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 431                 local->fif_pspoll--;
 432                 local->fif_probe_req--;
 433         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 434                 local->fif_probe_req--;
 435         }
 436
 437         if (sdata->dev) {
 438                 netif_addr_lock_bh(sdata->dev);
 439                 spin_lock_bh(&local->filter_lock);
 440                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 441                                  sdata->dev->addr_len);
 442                 spin_unlock_bh(&local->filter_lock);
 443                 netif_addr_unlock_bh(sdata->dev);
 444         }
 445
 446         del_timer_sync(&local->dynamic_ps_timer);
 447         cancel_work_sync(&local->dynamic_ps_enable_work);
 448
 449         cancel_work_sync(&sdata->recalc_smps);
 450         sdata_lock(sdata);
 451         mutex_lock(&local->mtx);
 452         sdata->vif.csa_active = false;
 453         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 454                 sdata->u.mgd.csa_waiting_bcn = false;
 455         if (sdata->csa_block_tx) {
 456                 ieee80211_wake_vif_queues(local, sdata,
 457                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 458                 sdata->csa_block_tx = false;
 459         }
 460         mutex_unlock(&local->mtx);
 461         sdata_unlock(sdata);
 462
 463         cancel_work_sync(&sdata->csa_finalize_work);
 464
 465         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 466
 467         if (sdata->wdev.cac_started) {
 468                 chandef = sdata->vif.bss_conf.chandef;
 469                 WARN_ON(local->suspended);
 470                 mutex_lock(&local->mtx);
 471                 ieee80211_vif_release_channel(sdata);
 472                 mutex_unlock(&local->mtx);
 473                 cfg80211_cac_event(sdata->dev, &chandef,
 474                                    NL80211_RADAR_CAC_ABORTED,
 475                                    GFP_KERNEL);
 476         }
 477
 478         /* APs need special treatment */
 479         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 480                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 481
 482                 /* down all dependent devices, that is VLANs */
 483                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 484                                          u.vlan.list)
 485                         dev_close(vlan->dev);
 486                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 487         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 488                 /* remove all packets in parent bc_buf pointing to this dev */
 489                 ps = &sdata->bss->ps;
 490
 491                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 492                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 493                         if (skb->dev == sdata->dev) {
 494                                 __skb_unlink(skb, &ps->bc_buf);
 495                                 local->total_ps_buffered--;
 496                                 ieee80211_free_txskb(&local->hw, skb);
 497                         }
 498                 }
 499                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 500         }
 501
 502         if (going_down)
 503                 local->open_count--;
 504
 505         switch (sdata->vif.type) {
 506         case NL80211_IFTYPE_AP_VLAN:
 507                 mutex_lock(&local->mtx);
 508                 list_del(&sdata->u.vlan.list);
 509                 mutex_unlock(&local->mtx);
 510                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 511                 /* see comment in the default case below */
 512                 ieee80211_free_keys(sdata, true);
 513                 /* no need to tell driver */
 514                 break;
 515         case NL80211_IFTYPE_MONITOR:
 516                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 517                         local->cooked_mntrs--;
 518                         break;
 519                 }
 520
 521                 local->monitors--;
 522                 if (local->monitors == 0) {
 523                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 524                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 525                 }
 526
 527                 ieee80211_adjust_monitor_flags(sdata, -1);
 528                 break;
 529         case NL80211_IFTYPE_NAN:
 530                 /* clean all the functions */
 531                 spin_lock_bh(&sdata->u.nan.func_lock);
 532
 533                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
 534                         idr_remove(&sdata->u.nan.function_inst_ids, i);
 535                         cfg80211_free_nan_func(func);
 536                 }
 537                 idr_destroy(&sdata->u.nan.function_inst_ids);
 538
 539                 spin_unlock_bh(&sdata->u.nan.func_lock);
 540                 break;
 541         case NL80211_IFTYPE_P2P_DEVICE:
 542                 /* relies on synchronize_rcu() below */
 543                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 544                 fallthrough;
 545         default:
 546                 cancel_work_sync(&sdata->work);
 547                 /*
 548                  * When we get here, the interface is marked down.
 549                  * Free the remaining keys, if there are any
 550                  * (which can happen in AP mode if userspace sets
 551                  * keys before the interface is operating)
 552                  *
 553                  * Force the key freeing to always synchronize_net()
 554                  * to wait for the RX path in case it is using this
 555                  * interface enqueuing frames at this very time on
 556                  * another CPU.
 557                  */
 558                 ieee80211_free_keys(sdata, true);
 559                 skb_queue_purge(&sdata->skb_queue);
 560         }
 561
 562         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 563         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 564                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 565                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 566                         if (info->control.vif == &sdata->vif) {
 567                                 __skb_unlink(skb, &local->pending[i]);
 568                                 ieee80211_free_txskb(&local->hw, skb);
 569                         }
 570                 }
 571         }
 572         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 573
 574         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 575                 ieee80211_txq_remove_vlan(local, sdata);
 576
 577         sdata->bss = NULL;
 578
 579         if (local->open_count == 0)
 580                 ieee80211_clear_tx_pending(local);
 581
 582         sdata->vif.bss_conf.beacon_int = 0;
 583
 584         /*
 585          * If the interface goes down while suspended, presumably because
 586          * the device was unplugged and that happens before our resume,
 587          * then the driver is already unconfigured and the remainder of
 588          * this function isn't needed.
 589          * XXX: what about WoWLAN? If the device has software state, e.g.
 590          *      memory allocated, it might expect teardown commands from
 591          *      mac80211 here?
 592          */
 593         if (local->suspended) {
 594                 WARN_ON(local->wowlan);
 595                 WARN_ON(rtnl_dereference(local->monitor_sdata));
 596                 return;
 597         }
 598
 599         switch (sdata->vif.type) {
 600         case NL80211_IFTYPE_AP_VLAN:
 601                 break;
 602         case NL80211_IFTYPE_MONITOR:
 603                 if (local->monitors == 0)
 604                         ieee80211_del_virtual_monitor(local);
 605
 606                 mutex_lock(&local->mtx);
 607                 ieee80211_recalc_idle(local);
 608                 mutex_unlock(&local->mtx);
 609
 610                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 611                         break;
 612
 613                 fallthrough;
 614         default:
 615                 if (going_down)
 616                         drv_remove_interface(local, sdata);
 617         }
 618
 619         ieee80211_recalc_ps(local);
 620
 621         if (cancel_scan)
 622                 flush_delayed_work(&local->scan_work);
 623
 624         if (local->open_count == 0) {
 625                 ieee80211_stop_device(local);
 626
 627                 /* no reconfiguring after stop! */
 628                 return;
 629         }
 630
 631         /* do after stop to avoid reconfiguring when we stop anyway */
 632         ieee80211_configure_filter(local);
 633         ieee80211_hw_config(local, hw_reconf_flags);
 634
 635         if (local->monitors == local->open_count)
 636                 ieee80211_add_virtual_monitor(local);
 637 }
 638
 639 static int ieee80211_stop(struct net_device *dev)
 640 {
 641         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 642
 643         wiphy_lock(sdata->local->hw.wiphy);
 644         ieee80211_do_stop(sdata, true);
 645         wiphy_unlock(sdata->local->hw.wiphy);
 646
 647         return 0;
 648 }
 649
 650 static void ieee80211_set_multicast_list(struct net_device *dev)
 651 {
 652         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 653         struct ieee80211_local *local = sdata->local;
 654         int allmulti, sdata_allmulti;
 655
 656         allmulti = !!(dev->flags & IFF_ALLMULTI);
 657         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 658
 659         if (allmulti != sdata_allmulti) {
 660                 if (dev->flags & IFF_ALLMULTI)
 661                         atomic_inc(&local->iff_allmultis);
 662                 else
 663                         atomic_dec(&local->iff_allmultis);
 664                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 665         }
 666
 667         spin_lock_bh(&local->filter_lock);
 668         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 669         spin_unlock_bh(&local->filter_lock);
 670         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 671 }
 672
 673 /*
 674  * Called when the netdev is removed or, by the code below, before
 675  * the interface type changes.
 676  */
 677 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 678 {
 679         int i;
 680
 681         /* free extra data */
 682         ieee80211_free_keys(sdata, false);
 683
 684         ieee80211_debugfs_remove_netdev(sdata);
 685
 686         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 687                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 688         sdata->fragment_next = 0;
 689
 690         if (ieee80211_vif_is_mesh(&sdata->vif))
 691                 ieee80211_mesh_teardown_sdata(sdata);
 692 }
 693
 694 static void ieee80211_uninit(struct net_device *dev)
 695 {
 696         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
 697 }
 698
 699 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 700                                          struct sk_buff *skb,
 701                                          struct net_device *sb_dev)
 702 {
 703         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 704 }
 705
 706 static void
 707 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 708 {
 709         dev_fetch_sw_netstats(stats, dev->tstats);
 710 }
 711
 712 static const struct net_device_ops ieee80211_dataif_ops = {
 713         .ndo_open               = ieee80211_open,
 714         .ndo_stop               = ieee80211_stop,
 715         .ndo_uninit             = ieee80211_uninit,
 716         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 717         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 718         .ndo_set_mac_address    = ieee80211_change_mac,
 719         .ndo_select_queue       = ieee80211_netdev_select_queue,
 720         .ndo_get_stats64        = ieee80211_get_stats64,
 721 };
 722
 723 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 724                                           struct sk_buff *skb,
 725                                           struct net_device *sb_dev)
 726 {
 727         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 728         struct ieee80211_local *local = sdata->local;
 729         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 730         struct ieee80211_hdr *hdr;
 731         int len_rthdr;
 732
 733         if (local->hw.queues < IEEE80211_NUM_ACS)
 734                 return 0;
 735
 736         /* reset flags and info before parsing radiotap header */
 737         memset(info, 0, sizeof(*info));
 738
 739         if (!ieee80211_parse_tx_radiotap(skb, dev))
 740                 return 0; /* doesn't matter, frame will be dropped */
 741
 742         len_rthdr = ieee80211_get_radiotap_len(skb->data);
 743         hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
 744         if (skb->len < len_rthdr + 2 ||
 745             skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
 746                 return 0; /* doesn't matter, frame will be dropped */
 747
 748         return ieee80211_select_queue_80211(sdata, skb, hdr);
 749 }
 750
 751 static const struct net_device_ops ieee80211_monitorif_ops = {
 752         .ndo_open               = ieee80211_open,
 753         .ndo_stop               = ieee80211_stop,
 754         .ndo_uninit             = ieee80211_uninit,
 755         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 756         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 757         .ndo_set_mac_address    = ieee80211_change_mac,
 758         .ndo_select_queue       = ieee80211_monitor_select_queue,
 759         .ndo_get_stats64        = ieee80211_get_stats64,
 760 };
 761
 762 static const struct net_device_ops ieee80211_dataif_8023_ops = {
 763         .ndo_open               = ieee80211_open,
 764         .ndo_stop               = ieee80211_stop,
 765         .ndo_uninit             = ieee80211_uninit,
 766         .ndo_start_xmit         = ieee80211_subif_start_xmit_8023,
 767         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 768         .ndo_set_mac_address    = ieee80211_change_mac,
 769         .ndo_select_queue       = ieee80211_netdev_select_queue,
 770         .ndo_get_stats64        = ieee80211_get_stats64,
 771 };
 772
 773 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)
 774 {
 775         switch (iftype) {
 776         /* P2P GO and client are mapped to AP/STATION types */
 777         case NL80211_IFTYPE_AP:
 778         case NL80211_IFTYPE_STATION:
 779                 return true;
 780         default:
 781                 return false;
 782         }
 783 }
 784
 785 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
 786 {
 787         struct ieee80211_local *local = sdata->local;
 788         u32 flags;
 789
 790         flags = sdata->vif.offload_flags;
 791
 792         if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
 793             ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
 794                 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
 795
 796                 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
 797                     local->hw.wiphy->frag_threshold != (u32)-1)
 798                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 799
 800                 if (local->monitors)
 801                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 802         } else {
 803                 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 804         }
 805
 806         if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) &&
 807             ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
 808                 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED;
 809
 810                 if (local->monitors)
 811                         flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
 812         } else {
 813                 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
 814         }
 815
 816         if (sdata->vif.offload_flags == flags)
 817                 return false;
 818
 819         sdata->vif.offload_flags = flags;
 820         ieee80211_check_fast_rx_iface(sdata);
 821         return true;
 822 }
 823
 824 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
 825 {
 826         struct ieee80211_local *local = sdata->local;
 827         struct ieee80211_sub_if_data *bss = sdata;
 828         bool enabled;
 829
 830         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 831                 if (!sdata->bss)
 832                         return;
 833
 834                 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
 835         }
 836
 837         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
 838             !ieee80211_iftype_supports_hdr_offload(bss->vif.type))
 839                 return;
 840
 841         enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
 842         if (sdata->wdev.use_4addr &&
 843             !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
 844                 enabled = false;
 845
 846         sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
 847                                            &ieee80211_dataif_ops;
 848 }
 849
 850 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
 851 {
 852         struct ieee80211_local *local = sdata->local;
 853         struct ieee80211_sub_if_data *vsdata;
 854
 855         if (ieee80211_set_sdata_offload_flags(sdata)) {
 856                 drv_update_vif_offload(local, sdata);
 857                 ieee80211_set_vif_encap_ops(sdata);
 858         }
 859
 860         list_for_each_entry(vsdata, &local->interfaces, list) {
 861                 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
 862                     vsdata->bss != &sdata->u.ap)
 863                         continue;
 864
 865                 ieee80211_set_vif_encap_ops(vsdata);
 866         }
 867 }
 868
 869 void ieee80211_recalc_offload(struct ieee80211_local *local)
 870 {
 871         struct ieee80211_sub_if_data *sdata;
 872
 873         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
 874                 return;
 875
 876         mutex_lock(&local->iflist_mtx);
 877
 878         list_for_each_entry(sdata, &local->interfaces, list) {
 879                 if (!ieee80211_sdata_running(sdata))
 880                         continue;
 881
 882                 ieee80211_recalc_sdata_offload(sdata);
 883         }
 884
 885         mutex_unlock(&local->iflist_mtx);
 886 }
 887
 888 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 889                                     const int offset)
 890 {
 891         struct ieee80211_local *local = sdata->local;
 892         u32 flags = sdata->u.mntr.flags;
 893
 894 #define ADJUST(_f, _s)  do {                                    \
 895         if (flags & MONITOR_FLAG_##_f)                          \
 896                 local->fif_##_s += offset;                      \
 897         } while (0)
 898
 899         ADJUST(FCSFAIL, fcsfail);
 900         ADJUST(PLCPFAIL, plcpfail);
 901         ADJUST(CONTROL, control);
 902         ADJUST(CONTROL, pspoll);
 903         ADJUST(OTHER_BSS, other_bss);
 904
 905 #undef ADJUST
 906 }
 907
 908 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 909 {
 910         struct ieee80211_local *local = sdata->local;
 911         int i;
 912
 913         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 914                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
 915                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 916                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 917                         sdata->vif.hw_queue[i] = i;
 918                 else
 919                         sdata->vif.hw_queue[i] = 0;
 920         }
 921         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 922 }
 923
 924 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 925 {
 926         struct ieee80211_sub_if_data *sdata;
 927         int ret;
 928
 929         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 930                 return 0;
 931
 932         ASSERT_RTNL();
 933
 934         if (local->monitor_sdata)
 935                 return 0;
 936
 937         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 938         if (!sdata)
 939                 return -ENOMEM;
 940
 941         /* set up data */
 942         sdata->local = local;
 943         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 944         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 945                  wiphy_name(local->hw.wiphy));
 946         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
 947
 948         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 949
 950         ieee80211_set_default_queues(sdata);
 951
 952         ret = drv_add_interface(local, sdata);
 953         if (WARN_ON(ret)) {
 954                 /* ok .. stupid driver, it asked for this! */
 955                 kfree(sdata);
 956                 return ret;
 957         }
 958
 959         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 960
 961         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 962         if (ret) {
 963                 kfree(sdata);
 964                 return ret;
 965         }
 966
 967         mutex_lock(&local->iflist_mtx);
 968         rcu_assign_pointer(local->monitor_sdata, sdata);
 969         mutex_unlock(&local->iflist_mtx);
 970
 971         mutex_lock(&local->mtx);
 972         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 973                                         IEEE80211_CHANCTX_EXCLUSIVE);
 974         mutex_unlock(&local->mtx);
 975         if (ret) {
 976                 mutex_lock(&local->iflist_mtx);
 977                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
 978                 mutex_unlock(&local->iflist_mtx);
 979                 synchronize_net();
 980                 drv_remove_interface(local, sdata);
 981                 kfree(sdata);
 982                 return ret;
 983         }
 984
 985         skb_queue_head_init(&sdata->skb_queue);
 986         INIT_WORK(&sdata->work, ieee80211_iface_work);
 987
 988         return 0;
 989 }
 990
 991 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 992 {
 993         struct ieee80211_sub_if_data *sdata;
 994
 995         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 996                 return;
 997
 998         ASSERT_RTNL();
 999
1000         mutex_lock(&local->iflist_mtx);
1001
1002         sdata = rcu_dereference_protected(local->monitor_sdata,
1003                                           lockdep_is_held(&local->iflist_mtx));
1004         if (!sdata) {
1005                 mutex_unlock(&local->iflist_mtx);
1006                 return;
1007         }
1008
1009         RCU_INIT_POINTER(local->monitor_sdata, NULL);
1010         mutex_unlock(&local->iflist_mtx);
1011
1012         synchronize_net();
1013
1014         mutex_lock(&local->mtx);
1015         ieee80211_vif_release_channel(sdata);
1016         mutex_unlock(&local->mtx);
1017
1018         drv_remove_interface(local, sdata);
1019
1020         kfree(sdata);
1021 }
1022
1023 /*
1024  * NOTE: Be very careful when changing this function, it must NOT return
1025  * an error on interface type changes that have been pre-checked, so most
1026  * checks should be in ieee80211_check_concurrent_iface.
1027  */
1028 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1029 {
1030         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1031         struct net_device *dev = wdev->netdev;
1032         struct ieee80211_local *local = sdata->local;
1033         u32 changed = 0;
1034         int res;
1035         u32 hw_reconf_flags = 0;
1036
1037         switch (sdata->vif.type) {
1038         case NL80211_IFTYPE_AP_VLAN: {
1039                 struct ieee80211_sub_if_data *master;
1040
1041                 if (!sdata->bss)
1042                         return -ENOLINK;
1043
1044                 mutex_lock(&local->mtx);
1045                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1046                 mutex_unlock(&local->mtx);
1047
1048                 master = container_of(sdata->bss,
1049                                       struct ieee80211_sub_if_data, u.ap);
1050                 sdata->control_port_protocol =
1051                         master->control_port_protocol;
1052                 sdata->control_port_no_encrypt =
1053                         master->control_port_no_encrypt;
1054                 sdata->control_port_over_nl80211 =
1055                         master->control_port_over_nl80211;
1056                 sdata->control_port_no_preauth =
1057                         master->control_port_no_preauth;
1058                 sdata->vif.cab_queue = master->vif.cab_queue;
1059                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1060                        sizeof(sdata->vif.hw_queue));
1061                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1062
1063                 mutex_lock(&local->key_mtx);
1064                 sdata->crypto_tx_tailroom_needed_cnt +=
1065                         master->crypto_tx_tailroom_needed_cnt;
1066                 mutex_unlock(&local->key_mtx);
1067
1068                 break;
1069                 }
1070         case NL80211_IFTYPE_AP:
1071                 sdata->bss = &sdata->u.ap;
1072                 break;
1073         case NL80211_IFTYPE_MESH_POINT:
1074         case NL80211_IFTYPE_STATION:
1075         case NL80211_IFTYPE_MONITOR:
1076         case NL80211_IFTYPE_ADHOC:
1077         case NL80211_IFTYPE_P2P_DEVICE:
1078         case NL80211_IFTYPE_OCB:
1079         case NL80211_IFTYPE_NAN:
1080                 /* no special treatment */
1081                 break;
1082         case NL80211_IFTYPE_UNSPECIFIED:
1083         case NUM_NL80211_IFTYPES:
1084         case NL80211_IFTYPE_P2P_CLIENT:
1085         case NL80211_IFTYPE_P2P_GO:
1086         case NL80211_IFTYPE_WDS:
1087                 /* cannot happen */
1088                 WARN_ON(1);
1089                 break;
1090         }
1091
1092         if (local->open_count == 0) {
1093                 res = drv_start(local);
1094                 if (res)
1095                         goto err_del_bss;
1096                 /* we're brought up, everything changes */
1097                 hw_reconf_flags = ~0;
1098                 ieee80211_led_radio(local, true);
1099                 ieee80211_mod_tpt_led_trig(local,
1100                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1101         }
1102
1103         /*
1104          * Copy the hopefully now-present MAC address to
1105          * this interface, if it has the special null one.
1106          */
1107         if (dev && is_zero_ether_addr(dev->dev_addr)) {
1108                 memcpy(dev->dev_addr,
1109                        local->hw.wiphy->perm_addr,
1110                        ETH_ALEN);
1111                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1112
1113                 if (!is_valid_ether_addr(dev->dev_addr)) {
1114                         res = -EADDRNOTAVAIL;
1115                         goto err_stop;
1116                 }
1117         }
1118
1119         switch (sdata->vif.type) {
1120         case NL80211_IFTYPE_AP_VLAN:
1121                 /* no need to tell driver, but set carrier and chanctx */
1122                 if (rtnl_dereference(sdata->bss->beacon)) {
1123                         ieee80211_vif_vlan_copy_chanctx(sdata);
1124                         netif_carrier_on(dev);
1125                         ieee80211_set_vif_encap_ops(sdata);
1126                 } else {
1127                         netif_carrier_off(dev);
1128                 }
1129                 break;
1130         case NL80211_IFTYPE_MONITOR:
1131                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1132                         local->cooked_mntrs++;
1133                         break;
1134                 }
1135
1136                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1137                         res = drv_add_interface(local, sdata);
1138                         if (res)
1139                                 goto err_stop;
1140                 } else if (local->monitors == 0 && local->open_count == 0) {
1141                         res = ieee80211_add_virtual_monitor(local);
1142                         if (res)
1143                                 goto err_stop;
1144                 }
1145
1146                 /* must be before the call to ieee80211_configure_filter */
1147                 local->monitors++;
1148                 if (local->monitors == 1) {
1149                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1150                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1151                 }
1152
1153                 ieee80211_adjust_monitor_flags(sdata, 1);
1154                 ieee80211_configure_filter(local);
1155                 ieee80211_recalc_offload(local);
1156                 mutex_lock(&local->mtx);
1157                 ieee80211_recalc_idle(local);
1158                 mutex_unlock(&local->mtx);
1159
1160                 netif_carrier_on(dev);
1161                 break;
1162         default:
1163                 if (coming_up) {
1164                         ieee80211_del_virtual_monitor(local);
1165                         ieee80211_set_sdata_offload_flags(sdata);
1166
1167                         res = drv_add_interface(local, sdata);
1168                         if (res)
1169                                 goto err_stop;
1170
1171                         ieee80211_set_vif_encap_ops(sdata);
1172                         res = ieee80211_check_queues(sdata,
1173                                 ieee80211_vif_type_p2p(&sdata->vif));
1174                         if (res)
1175                                 goto err_del_interface;
1176                 }
1177
1178                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1179                         local->fif_pspoll++;
1180                         local->fif_probe_req++;
1181
1182                         ieee80211_configure_filter(local);
1183                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1184                         local->fif_probe_req++;
1185                 }
1186
1187                 if (sdata->vif.probe_req_reg)
1188                         drv_config_iface_filter(local, sdata,
1189                                                 FIF_PROBE_REQ,
1190                                                 FIF_PROBE_REQ);
1191
1192                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1193                     sdata->vif.type != NL80211_IFTYPE_NAN)
1194                         changed |= ieee80211_reset_erp_info(sdata);
1195                 ieee80211_bss_info_change_notify(sdata, changed);
1196
1197                 switch (sdata->vif.type) {
1198                 case NL80211_IFTYPE_STATION:
1199                 case NL80211_IFTYPE_ADHOC:
1200                 case NL80211_IFTYPE_AP:
1201                 case NL80211_IFTYPE_MESH_POINT:
1202                 case NL80211_IFTYPE_OCB:
1203                         netif_carrier_off(dev);
1204                         break;
1205                 case NL80211_IFTYPE_P2P_DEVICE:
1206                 case NL80211_IFTYPE_NAN:
1207                         break;
1208                 default:
1209                         /* not reached */
1210                         WARN_ON(1);
1211                 }
1212
1213                 /*
1214                  * Set default queue parameters so drivers don't
1215                  * need to initialise the hardware if the hardware
1216                  * doesn't start up with sane defaults.
1217                  * Enable QoS for anything but station interfaces.
1218                  */
1219                 ieee80211_set_wmm_default(sdata, true,
1220                         sdata->vif.type != NL80211_IFTYPE_STATION);
1221         }
1222
1223         set_bit(SDATA_STATE_RUNNING, &sdata->state);
1224
1225         switch (sdata->vif.type) {
1226         case NL80211_IFTYPE_P2P_DEVICE:
1227                 rcu_assign_pointer(local->p2p_sdata, sdata);
1228                 break;
1229         case NL80211_IFTYPE_MONITOR:
1230                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1231                         break;
1232                 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1233                 break;
1234         default:
1235                 break;
1236         }
1237
1238         /*
1239          * set_multicast_list will be invoked by the networking core
1240          * which will check whether any increments here were done in
1241          * error and sync them down to the hardware as filter flags.
1242          */
1243         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1244                 atomic_inc(&local->iff_allmultis);
1245
1246         if (coming_up)
1247                 local->open_count++;
1248
1249         if (hw_reconf_flags)
1250                 ieee80211_hw_config(local, hw_reconf_flags);
1251
1252         ieee80211_recalc_ps(local);
1253
1254         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1255             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1256             local->ops->wake_tx_queue) {
1257                 /* XXX: for AP_VLAN, actually track AP queues */
1258                 if (dev)
1259                         netif_tx_start_all_queues(dev);
1260         } else if (dev) {
1261                 unsigned long flags;
1262                 int n_acs = IEEE80211_NUM_ACS;
1263                 int ac;
1264
1265                 if (local->hw.queues < IEEE80211_NUM_ACS)
1266                         n_acs = 1;
1267
1268                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1269                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
1270                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
1271                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
1272                         for (ac = 0; ac < n_acs; ac++) {
1273                                 int ac_queue = sdata->vif.hw_queue[ac];
1274
1275                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
1276                                     skb_queue_empty(&local->pending[ac_queue]))
1277                                         netif_start_subqueue(dev, ac);
1278                         }
1279                 }
1280                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1281         }
1282
1283         return 0;
1284  err_del_interface:
1285         drv_remove_interface(local, sdata);
1286  err_stop:
1287         if (!local->open_count)
1288                 drv_stop(local);
1289  err_del_bss:
1290         sdata->bss = NULL;
1291         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1292                 mutex_lock(&local->mtx);
1293                 list_del(&sdata->u.vlan.list);
1294                 mutex_unlock(&local->mtx);
1295         }
1296         /* might already be clear but that doesn't matter */
1297         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1298         return res;
1299 }
1300
1301 static void ieee80211_if_free(struct net_device *dev)
1302 {
1303         free_percpu(dev->tstats);
1304 }
1305
1306 static void ieee80211_if_setup(struct net_device *dev)
1307 {
1308         ether_setup(dev);
1309         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1310         dev->netdev_ops = &ieee80211_dataif_ops;
1311         dev->needs_free_netdev = true;
1312         dev->priv_destructor = ieee80211_if_free;
1313 }
1314
1315 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1316 {
1317         ieee80211_if_setup(dev);
1318         dev->priv_flags |= IFF_NO_QUEUE;
1319 }
1320
1321 static void ieee80211_iface_work(struct work_struct *work)
1322 {
1323         struct ieee80211_sub_if_data *sdata =
1324                 container_of(work, struct ieee80211_sub_if_data, work);
1325         struct ieee80211_local *local = sdata->local;
1326         struct sk_buff *skb;
1327         struct sta_info *sta;
1328
1329         if (!ieee80211_sdata_running(sdata))
1330                 return;
1331
1332         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1333                 return;
1334
1335         if (!ieee80211_can_run_worker(local))
1336                 return;
1337
1338         /* first process frames */
1339         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1340                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1341
1342                 kcov_remote_start_common(skb_get_kcov_handle(skb));
1343                 if (ieee80211_is_action(mgmt->frame_control) &&
1344                     mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1345                         int len = skb->len;
1346
1347                         mutex_lock(&local->sta_mtx);
1348                         sta = sta_info_get_bss(sdata, mgmt->sa);
1349                         if (sta) {
1350                                 switch (mgmt->u.action.u.addba_req.action_code) {
1351                                 case WLAN_ACTION_ADDBA_REQ:
1352                                         ieee80211_process_addba_request(
1353                                                         local, sta, mgmt, len);
1354                                         break;
1355                                 case WLAN_ACTION_ADDBA_RESP:
1356                                         ieee80211_process_addba_resp(local, sta,
1357                                                                      mgmt, len);
1358                                         break;
1359                                 case WLAN_ACTION_DELBA:
1360                                         ieee80211_process_delba(sdata, sta,
1361                                                                 mgmt, len);
1362                                         break;
1363                                 default:
1364                                         WARN_ON(1);
1365                                         break;
1366                                 }
1367                         }
1368                         mutex_unlock(&local->sta_mtx);
1369                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1370                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1371                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1372                         case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1373                                 struct ieee80211_rx_status *status;
1374                                 enum nl80211_band band;
1375                                 u8 opmode;
1376
1377                                 status = IEEE80211_SKB_RXCB(skb);
1378                                 band = status->band;
1379                                 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1380
1381                                 mutex_lock(&local->sta_mtx);
1382                                 sta = sta_info_get_bss(sdata, mgmt->sa);
1383
1384                                 if (sta)
1385                                         ieee80211_vht_handle_opmode(sdata, sta,
1386                                                                     opmode,
1387                                                                     band);
1388
1389                                 mutex_unlock(&local->sta_mtx);
1390                                 break;
1391                         }
1392                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1393                                 ieee80211_process_mu_groups(sdata, mgmt);
1394                                 break;
1395                         default:
1396                                 WARN_ON(1);
1397                                 break;
1398                         }
1399                 } else if (ieee80211_is_ext(mgmt->frame_control)) {
1400                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
1401                                 ieee80211_sta_rx_queued_ext(sdata, skb);
1402                         else
1403                                 WARN_ON(1);
1404                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1405                         struct ieee80211_hdr *hdr = (void *)mgmt;
1406                         /*
1407                          * So the frame isn't mgmt, but frame_control
1408                          * is at the right place anyway, of course, so
1409                          * the if statement is correct.
1410                          *
1411                          * Warn if we have other data frame types here,
1412                          * they must not get here.
1413                          */
1414                         WARN_ON(hdr->frame_control &
1415                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1416                         WARN_ON(!(hdr->seq_ctrl &
1417                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1418                         /*
1419                          * This was a fragment of a frame, received while
1420                          * a block-ack session was active. That cannot be
1421                          * right, so terminate the session.
1422                          */
1423                         mutex_lock(&local->sta_mtx);
1424                         sta = sta_info_get_bss(sdata, mgmt->sa);
1425                         if (sta) {
1426                                 u16 tid = ieee80211_get_tid(hdr);
1427
1428                                 __ieee80211_stop_rx_ba_session(
1429                                         sta, tid, WLAN_BACK_RECIPIENT,
1430                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1431                                         true);
1432                         }
1433                         mutex_unlock(&local->sta_mtx);
1434                 } else switch (sdata->vif.type) {
1435                 case NL80211_IFTYPE_STATION:
1436                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1437                         break;
1438                 case NL80211_IFTYPE_ADHOC:
1439                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1440                         break;
1441                 case NL80211_IFTYPE_MESH_POINT:
1442                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1443                                 break;
1444                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1445                         break;
1446                 default:
1447                         WARN(1, "frame for unexpected interface type");
1448                         break;
1449                 }
1450
1451                 kfree_skb(skb);
1452                 kcov_remote_stop();
1453         }
1454
1455         /* then other type-dependent work */
1456         switch (sdata->vif.type) {
1457         case NL80211_IFTYPE_STATION:
1458                 ieee80211_sta_work(sdata);
1459                 break;
1460         case NL80211_IFTYPE_ADHOC:
1461                 ieee80211_ibss_work(sdata);
1462                 break;
1463         case NL80211_IFTYPE_MESH_POINT:
1464                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1465                         break;
1466                 ieee80211_mesh_work(sdata);
1467                 break;
1468         case NL80211_IFTYPE_OCB:
1469                 ieee80211_ocb_work(sdata);
1470                 break;
1471         default:
1472                 break;
1473         }
1474 }
1475
1476 static void ieee80211_recalc_smps_work(struct work_struct *work)
1477 {
1478         struct ieee80211_sub_if_data *sdata =
1479                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1480
1481         ieee80211_recalc_smps(sdata);
1482 }
1483
1484 /*
1485  * Helper function to initialise an interface to a specific type.
1486  */
1487 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1488                                   enum nl80211_iftype type)
1489 {
1490         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1491                                                     0xff, 0xff, 0xff};
1492
1493         /* clear type-dependent union */
1494         memset(&sdata->u, 0, sizeof(sdata->u));
1495
1496         /* and set some type-dependent values */
1497         sdata->vif.type = type;
1498         sdata->vif.p2p = false;
1499         sdata->wdev.iftype = type;
1500
1501         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1502         sdata->control_port_no_encrypt = false;
1503         sdata->control_port_over_nl80211 = false;
1504         sdata->control_port_no_preauth = false;
1505         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1506         sdata->vif.bss_conf.idle = true;
1507         sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1508
1509         sdata->noack_map = 0;
1510
1511         /* only monitor/p2p-device differ */
1512         if (sdata->dev) {
1513                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1514                 sdata->dev->type = ARPHRD_ETHER;
1515         }
1516
1517         skb_queue_head_init(&sdata->skb_queue);
1518         INIT_WORK(&sdata->work, ieee80211_iface_work);
1519         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1520         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1521         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1522         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1523
1524         switch (type) {
1525         case NL80211_IFTYPE_P2P_GO:
1526                 type = NL80211_IFTYPE_AP;
1527                 sdata->vif.type = type;
1528                 sdata->vif.p2p = true;
1529                 fallthrough;
1530         case NL80211_IFTYPE_AP:
1531                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1532                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1533                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1534                 break;
1535         case NL80211_IFTYPE_P2P_CLIENT:
1536                 type = NL80211_IFTYPE_STATION;
1537                 sdata->vif.type = type;
1538                 sdata->vif.p2p = true;
1539                 fallthrough;
1540         case NL80211_IFTYPE_STATION:
1541                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1542                 ieee80211_sta_setup_sdata(sdata);
1543                 break;
1544         case NL80211_IFTYPE_OCB:
1545                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1546                 ieee80211_ocb_setup_sdata(sdata);
1547                 break;
1548         case NL80211_IFTYPE_ADHOC:
1549                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1550                 ieee80211_ibss_setup_sdata(sdata);
1551                 break;
1552         case NL80211_IFTYPE_MESH_POINT:
1553                 if (ieee80211_vif_is_mesh(&sdata->vif))
1554                         ieee80211_mesh_init_sdata(sdata);
1555                 break;
1556         case NL80211_IFTYPE_MONITOR:
1557                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1558                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1559                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1560                                       MONITOR_FLAG_OTHER_BSS;
1561                 break;
1562         case NL80211_IFTYPE_NAN:
1563                 idr_init(&sdata->u.nan.function_inst_ids);
1564                 spin_lock_init(&sdata->u.nan.func_lock);
1565                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1566                 break;
1567         case NL80211_IFTYPE_AP_VLAN:
1568         case NL80211_IFTYPE_P2P_DEVICE:
1569                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1570                 break;
1571         case NL80211_IFTYPE_UNSPECIFIED:
1572         case NL80211_IFTYPE_WDS:
1573         case NUM_NL80211_IFTYPES:
1574                 WARN_ON(1);
1575                 break;
1576         }
1577
1578         ieee80211_debugfs_add_netdev(sdata);
1579 }
1580
1581 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1582                                            enum nl80211_iftype type)
1583 {
1584         struct ieee80211_local *local = sdata->local;
1585         int ret, err;
1586         enum nl80211_iftype internal_type = type;
1587         bool p2p = false;
1588
1589         ASSERT_RTNL();
1590
1591         if (!local->ops->change_interface)
1592                 return -EBUSY;
1593
1594         switch (sdata->vif.type) {
1595         case NL80211_IFTYPE_AP:
1596         case NL80211_IFTYPE_STATION:
1597         case NL80211_IFTYPE_ADHOC:
1598         case NL80211_IFTYPE_OCB:
1599                 /*
1600                  * Could maybe also all others here?
1601                  * Just not sure how that interacts
1602                  * with the RX/config path e.g. for
1603                  * mesh.
1604                  */
1605                 break;
1606         default:
1607                 return -EBUSY;
1608         }
1609
1610         switch (type) {
1611         case NL80211_IFTYPE_AP:
1612         case NL80211_IFTYPE_STATION:
1613         case NL80211_IFTYPE_ADHOC:
1614         case NL80211_IFTYPE_OCB:
1615                 /*
1616                  * Could probably support everything
1617                  * but here.
1618                  */
1619                 break;
1620         case NL80211_IFTYPE_P2P_CLIENT:
1621                 p2p = true;
1622                 internal_type = NL80211_IFTYPE_STATION;
1623                 break;
1624         case NL80211_IFTYPE_P2P_GO:
1625                 p2p = true;
1626                 internal_type = NL80211_IFTYPE_AP;
1627                 break;
1628         default:
1629                 return -EBUSY;
1630         }
1631
1632         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1633         if (ret)
1634                 return ret;
1635
1636         ieee80211_stop_vif_queues(local, sdata,
1637                                   IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1638         synchronize_net();
1639
1640         ieee80211_do_stop(sdata, false);
1641
1642         ieee80211_teardown_sdata(sdata);
1643
1644         ieee80211_set_sdata_offload_flags(sdata);
1645         ret = drv_change_interface(local, sdata, internal_type, p2p);
1646         if (ret)
1647                 type = ieee80211_vif_type_p2p(&sdata->vif);
1648
1649         /*
1650          * Ignore return value here, there's not much we can do since
1651          * the driver changed the interface type internally already.
1652          * The warnings will hopefully make driver authors fix it :-)
1653          */
1654         ieee80211_check_queues(sdata, type);
1655
1656         ieee80211_setup_sdata(sdata, type);
1657         ieee80211_set_vif_encap_ops(sdata);
1658
1659         err = ieee80211_do_open(&sdata->wdev, false);
1660         WARN(err, "type change: do_open returned %d", err);
1661
1662         ieee80211_wake_vif_queues(local, sdata,
1663                                   IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1664         return ret;
1665 }
1666
1667 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1668                              enum nl80211_iftype type)
1669 {
1670         int ret;
1671
1672         ASSERT_RTNL();
1673
1674         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1675                 return 0;
1676
1677         if (ieee80211_sdata_running(sdata)) {
1678                 ret = ieee80211_runtime_change_iftype(sdata, type);
1679                 if (ret)
1680                         return ret;
1681         } else {
1682                 /* Purge and reset type-dependent state. */
1683                 ieee80211_teardown_sdata(sdata);
1684                 ieee80211_setup_sdata(sdata, type);
1685         }
1686
1687         /* reset some values that shouldn't be kept across type changes */
1688         if (type == NL80211_IFTYPE_STATION)
1689                 sdata->u.mgd.use_4addr = false;
1690
1691         return 0;
1692 }
1693
1694 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1695                                        u8 *perm_addr, enum nl80211_iftype type)
1696 {
1697         struct ieee80211_sub_if_data *sdata;
1698         u64 mask, start, addr, val, inc;
1699         u8 *m;
1700         u8 tmp_addr[ETH_ALEN];
1701         int i;
1702
1703         /* default ... something at least */
1704         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1705
1706         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1707             local->hw.wiphy->n_addresses <= 1)
1708                 return;
1709
1710         mutex_lock(&local->iflist_mtx);
1711
1712         switch (type) {
1713         case NL80211_IFTYPE_MONITOR:
1714                 /* doesn't matter */
1715                 break;
1716         case NL80211_IFTYPE_AP_VLAN:
1717                 /* match up with an AP interface */
1718                 list_for_each_entry(sdata, &local->interfaces, list) {
1719                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1720                                 continue;
1721                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1722                         break;
1723                 }
1724                 /* keep default if no AP interface present */
1725                 break;
1726         case NL80211_IFTYPE_P2P_CLIENT:
1727         case NL80211_IFTYPE_P2P_GO:
1728                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1729                         list_for_each_entry(sdata, &local->interfaces, list) {
1730                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1731                                         continue;
1732                                 if (!ieee80211_sdata_running(sdata))
1733                                         continue;
1734                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1735                                 goto out_unlock;
1736                         }
1737                 }
1738                 fallthrough;
1739         default:
1740                 /* assign a new address if possible -- try n_addresses first */
1741                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1742                         bool used = false;
1743
1744                         list_for_each_entry(sdata, &local->interfaces, list) {
1745                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1746                                                      sdata->vif.addr)) {
1747                                         used = true;
1748                                         break;
1749                                 }
1750                         }
1751
1752                         if (!used) {
1753                                 memcpy(perm_addr,
1754                                        local->hw.wiphy->addresses[i].addr,
1755                                        ETH_ALEN);
1756                                 break;
1757                         }
1758                 }
1759
1760                 /* try mask if available */
1761                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1762                         break;
1763
1764                 m = local->hw.wiphy->addr_mask;
1765                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1766                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1767                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1768
1769                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1770                         /* not a contiguous mask ... not handled now! */
1771                         pr_info("not contiguous\n");
1772                         break;
1773                 }
1774
1775                 /*
1776                  * Pick address of existing interface in case user changed
1777                  * MAC address manually, default to perm_addr.
1778                  */
1779                 m = local->hw.wiphy->perm_addr;
1780                 list_for_each_entry(sdata, &local->interfaces, list) {
1781                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1782                                 continue;
1783                         m = sdata->vif.addr;
1784                         break;
1785                 }
1786                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1787                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1788                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1789
1790                 inc = 1ULL<<__ffs64(mask);
1791                 val = (start & mask);
1792                 addr = (start & ~mask) | (val & mask);
1793                 do {
1794                         bool used = false;
1795
1796                         tmp_addr[5] = addr >> 0*8;
1797                         tmp_addr[4] = addr >> 1*8;
1798                         tmp_addr[3] = addr >> 2*8;
1799                         tmp_addr[2] = addr >> 3*8;
1800                         tmp_addr[1] = addr >> 4*8;
1801                         tmp_addr[0] = addr >> 5*8;
1802
1803                         val += inc;
1804
1805                         list_for_each_entry(sdata, &local->interfaces, list) {
1806                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1807                                         used = true;
1808                                         break;
1809                                 }
1810                         }
1811
1812                         if (!used) {
1813                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1814                                 break;
1815                         }
1816                         addr = (start & ~mask) | (val & mask);
1817                 } while (addr != start);
1818
1819                 break;
1820         }
1821
1822  out_unlock:
1823         mutex_unlock(&local->iflist_mtx);
1824 }
1825
1826 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1827                      unsigned char name_assign_type,
1828                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1829                      struct vif_params *params)
1830 {
1831         struct net_device *ndev = NULL;
1832         struct ieee80211_sub_if_data *sdata = NULL;
1833         struct txq_info *txqi;
1834         void (*if_setup)(struct net_device *dev);
1835         int ret, i;
1836         int txqs = 1;
1837
1838         ASSERT_RTNL();
1839
1840         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1841                 struct wireless_dev *wdev;
1842
1843                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1844                                 GFP_KERNEL);
1845                 if (!sdata)
1846                         return -ENOMEM;
1847                 wdev = &sdata->wdev;
1848
1849                 sdata->dev = NULL;
1850                 strlcpy(sdata->name, name, IFNAMSIZ);
1851                 ieee80211_assign_perm_addr(local, wdev->address, type);
1852                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1853         } else {
1854                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1855                                  sizeof(void *));
1856                 int txq_size = 0;
1857
1858                 if (local->ops->wake_tx_queue &&
1859                     type != NL80211_IFTYPE_AP_VLAN &&
1860                     (type != NL80211_IFTYPE_MONITOR ||
1861                      (params->flags & MONITOR_FLAG_ACTIVE)))
1862                         txq_size += sizeof(struct txq_info) +
1863                                     local->hw.txq_data_size;
1864
1865                 if (local->ops->wake_tx_queue) {
1866                         if_setup = ieee80211_if_setup_no_queue;
1867                 } else {
1868                         if_setup = ieee80211_if_setup;
1869                         if (local->hw.queues >= IEEE80211_NUM_ACS)
1870                                 txqs = IEEE80211_NUM_ACS;
1871                 }
1872
1873                 ndev = alloc_netdev_mqs(size + txq_size,
1874                                         name, name_assign_type,
1875                                         if_setup, txqs, 1);
1876                 if (!ndev)
1877                         return -ENOMEM;
1878
1879                 if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len)
1880                         ndev->tx_queue_len = local->hw.wiphy->tx_queue_len;
1881
1882                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1883
1884                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1885                 if (!ndev->tstats) {
1886                         free_netdev(ndev);
1887                         return -ENOMEM;
1888                 }
1889
1890                 ndev->needed_headroom = local->tx_headroom +
1891                                         4*6 /* four MAC addresses */
1892                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1893                                         + 6 /* mesh */
1894                                         + 8 /* rfc1042/bridge tunnel */
1895                                         - ETH_HLEN /* ethernet hard_header_len */
1896                                         + IEEE80211_ENCRYPT_HEADROOM;
1897                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1898
1899                 ret = dev_alloc_name(ndev, ndev->name);
1900                 if (ret < 0) {
1901                         ieee80211_if_free(ndev);
1902                         free_netdev(ndev);
1903                         return ret;
1904                 }
1905
1906                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1907                 if (is_valid_ether_addr(params->macaddr))
1908                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1909                 else
1910                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1911                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1912
1913                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1914                 sdata = netdev_priv(ndev);
1915                 ndev->ieee80211_ptr = &sdata->wdev;
1916                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1917                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1918
1919                 if (txq_size) {
1920                         txqi = netdev_priv(ndev) + size;
1921                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1922                 }
1923
1924                 sdata->dev = ndev;
1925         }
1926
1927         /* initialise type-independent data */
1928         sdata->wdev.wiphy = local->hw.wiphy;
1929         sdata->local = local;
1930
1931         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1932                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1933
1934         INIT_LIST_HEAD(&sdata->key_list);
1935
1936         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1937                           ieee80211_dfs_cac_timer_work);
1938         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1939                           ieee80211_delayed_tailroom_dec);
1940
1941         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1942                 struct ieee80211_supported_band *sband;
1943                 sband = local->hw.wiphy->bands[i];
1944                 sdata->rc_rateidx_mask[i] =
1945                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1946                 if (sband) {
1947                         __le16 cap;
1948                         u16 *vht_rate_mask;
1949
1950                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1951                                sband->ht_cap.mcs.rx_mask,
1952                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1953
1954                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1955                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1956                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1957                 } else {
1958                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1959                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1960                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1961                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1962                 }
1963         }
1964
1965         ieee80211_set_default_queues(sdata);
1966
1967         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1968         sdata->user_power_level = local->user_power_level;
1969
1970         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1971
1972         /* setup type-dependent data */
1973         ieee80211_setup_sdata(sdata, type);
1974
1975         if (ndev) {
1976                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1977                 if (type == NL80211_IFTYPE_STATION)
1978                         sdata->u.mgd.use_4addr = params->use_4addr;
1979
1980                 ndev->features |= local->hw.netdev_features;
1981                 ndev->hw_features |= ndev->features &
1982                                         MAC80211_SUPPORTED_FEATURES_TX;
1983
1984                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1985
1986                 /* MTU range: 256 - 2304 */
1987                 ndev->min_mtu = 256;
1988                 ndev->max_mtu = local->hw.max_mtu;
1989
1990                 ret = cfg80211_register_netdevice(ndev);
1991                 if (ret) {
1992                         free_netdev(ndev);
1993                         return ret;
1994                 }
1995         }
1996
1997         mutex_lock(&local->iflist_mtx);
1998         list_add_tail_rcu(&sdata->list, &local->interfaces);
1999         mutex_unlock(&local->iflist_mtx);
2000
2001         if (new_wdev)
2002                 *new_wdev = &sdata->wdev;
2003
2004         return 0;
2005 }
2006
2007 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2008 {
2009         ASSERT_RTNL();
2010
2011         mutex_lock(&sdata->local->iflist_mtx);
2012         list_del_rcu(&sdata->list);
2013         mutex_unlock(&sdata->local->iflist_mtx);
2014
2015         if (sdata->vif.txq)
2016                 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2017
2018         synchronize_rcu();
2019
2020         cfg80211_unregister_wdev(&sdata->wdev);
2021
2022         if (!sdata->dev) {
2023                 ieee80211_teardown_sdata(sdata);
2024                 kfree(sdata);
2025         }
2026 }
2027
2028 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2029 {
2030         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2031                 return;
2032         ieee80211_do_stop(sdata, true);
2033 }
2034
2035 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2036 {
2037         struct ieee80211_sub_if_data *sdata, *tmp;
2038         LIST_HEAD(unreg_list);
2039         LIST_HEAD(wdev_list);
2040
2041         ASSERT_RTNL();
2042
2043         /* Before destroying the interfaces, make sure they're all stopped so
2044          * that the hardware is stopped. Otherwise, the driver might still be
2045          * iterating the interfaces during the shutdown, e.g. from a worker
2046          * or from RX processing or similar, and if it does so (using atomic
2047          * iteration) while we're manipulating the list, the iteration will
2048          * crash.
2049          *
2050          * After this, the hardware should be stopped and the driver should
2051          * have stopped all of its activities, so that we can do RCU-unaware
2052          * manipulations of the interface list below.
2053          */
2054         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2055
2056         WARN(local->open_count, "%s: open count remains %d\n",
2057              wiphy_name(local->hw.wiphy), local->open_count);
2058
2059         ieee80211_txq_teardown_flows(local);
2060
2061         mutex_lock(&local->iflist_mtx);
2062         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
2063                 list_del(&sdata->list);
2064
2065                 if (sdata->dev)
2066                         unregister_netdevice_queue(sdata->dev, &unreg_list);
2067                 else
2068                         list_add(&sdata->list, &wdev_list);
2069         }
2070         mutex_unlock(&local->iflist_mtx);
2071
2072         unregister_netdevice_many(&unreg_list);
2073
2074         wiphy_lock(local->hw.wiphy);
2075         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2076                 list_del(&sdata->list);
2077                 cfg80211_unregister_wdev(&sdata->wdev);
2078                 kfree(sdata);
2079         }
2080         wiphy_unlock(local->hw.wiphy);
2081 }
2082
2083 static int netdev_notify(struct notifier_block *nb,
2084                          unsigned long state, void *ptr)
2085 {
2086         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2087         struct ieee80211_sub_if_data *sdata;
2088
2089         if (state != NETDEV_CHANGENAME)
2090                 return NOTIFY_DONE;
2091
2092         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2093                 return NOTIFY_DONE;
2094
2095         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2096                 return NOTIFY_DONE;
2097
2098         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2099         memcpy(sdata->name, dev->name, IFNAMSIZ);
2100         ieee80211_debugfs_rename_netdev(sdata);
2101
2102         return NOTIFY_OK;
2103 }
2104
2105 static struct notifier_block mac80211_netdev_notifier = {
2106         .notifier_call = netdev_notify,
2107 };
2108
2109 int ieee80211_iface_init(void)
2110 {
2111         return register_netdevice_notifier(&mac80211_netdev_notifier);
2112 }
2113
2114 void ieee80211_iface_exit(void)
2115 {
2116         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2117 }
2118
2119 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2120 {
2121         if (sdata->vif.type == NL80211_IFTYPE_AP)
2122                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2123         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2124                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2125 }
2126
2127 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2128 {
2129         if (sdata->vif.type == NL80211_IFTYPE_AP)
2130                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2131         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2132                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2133 }