net/mac80211/iface.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Interface handling
   4  *
   5  * Copyright 2002-2005, Instant802 Networks, Inc.
   6  * Copyright 2005-2006, Devicescape Software, Inc.
   7  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   8  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   9  * Copyright 2013-2014  Intel Mobile Communications GmbH
  10  * Copyright (c) 2016        Intel Deutschland GmbH
  11  * Copyright (C) 2018-2021 Intel Corporation
  12  */
  13 #include <linux/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/if_arp.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/rtnetlink.h>
  18 #include <linux/kcov.h>
  19 #include <net/mac80211.h>
  20 #include <net/ieee80211_radiotap.h>
  21 #include "ieee80211_i.h"
  22 #include "sta_info.h"
  23 #include "debugfs_netdev.h"
  24 #include "mesh.h"
  25 #include "led.h"
  26 #include "driver-ops.h"
  27 #include "wme.h"
  28 #include "rate.h"
  29
  30 /**
  31  * DOC: Interface list locking
  32  *
  33  * The interface list in each struct ieee80211_local is protected
  34  * three-fold:
  35  *
  36  * (1) modifications may only be done under the RTNL
  37  * (2) modifications and readers are protected against each other by
  38  *     the iflist_mtx.
  39  * (3) modifications are done in an RCU manner so atomic readers
  40  *     can traverse the list in RCU-safe blocks.
  41  *
  42  * As a consequence, reads (traversals) of the list can be protected
  43  * by either the RTNL, the iflist_mtx or RCU.
  44  */
  45
  46 static void ieee80211_iface_work(struct work_struct *work);
  47
  48 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  49 {
  50         struct ieee80211_chanctx_conf *chanctx_conf;
  51         int power;
  52
  53         rcu_read_lock();
  54         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  55         if (!chanctx_conf) {
  56                 rcu_read_unlock();
  57                 return false;
  58         }
  59
  60         power = ieee80211_chandef_max_power(&chanctx_conf->def);
  61         rcu_read_unlock();
  62
  63         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  64                 power = min(power, sdata->user_power_level);
  65
  66         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  67                 power = min(power, sdata->ap_power_level);
  68
  69         if (power != sdata->vif.bss_conf.txpower) {
  70                 sdata->vif.bss_conf.txpower = power;
  71                 ieee80211_hw_config(sdata->local, 0);
  72                 return true;
  73         }
  74
  75         return false;
  76 }
  77
  78 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
  79                               bool update_bss)
  80 {
  81         if (__ieee80211_recalc_txpower(sdata) ||
  82             (update_bss && ieee80211_sdata_running(sdata)))
  83                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  84 }
  85
  86 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
  87 {
  88         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  89                 return 0;
  90
  91         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  92         return IEEE80211_CONF_CHANGE_IDLE;
  93 }
  94
  95 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  96 {
  97         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  98                 return 0;
  99
 100         ieee80211_flush_queues(local, NULL, false);
 101
 102         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 103         return IEEE80211_CONF_CHANGE_IDLE;
 104 }
 105
 106 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
 107                                    bool force_active)
 108 {
 109         bool working, scanning, active;
 110         unsigned int led_trig_start = 0, led_trig_stop = 0;
 111
 112         lockdep_assert_held(&local->mtx);
 113
 114         active = force_active ||
 115                  !list_empty(&local->chanctx_list) ||
 116                  local->monitors;
 117
 118         working = !local->ops->remain_on_channel &&
 119                   !list_empty(&local->roc_list);
 120
 121         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 122                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 123
 124         if (working || scanning)
 125                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 126         else
 127                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 128
 129         if (active)
 130                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 131         else
 132                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 133
 134         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 135
 136         if (working || scanning || active)
 137                 return __ieee80211_idle_off(local);
 138         return __ieee80211_idle_on(local);
 139 }
 140
 141 u32 ieee80211_idle_off(struct ieee80211_local *local)
 142 {
 143         return __ieee80211_recalc_idle(local, true);
 144 }
 145
 146 void ieee80211_recalc_idle(struct ieee80211_local *local)
 147 {
 148         u32 change = __ieee80211_recalc_idle(local, false);
 149         if (change)
 150                 ieee80211_hw_config(local, change);
 151 }
 152
 153 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 154                                 bool check_dup)
 155 {
 156         struct ieee80211_local *local = sdata->local;
 157         struct ieee80211_sub_if_data *iter;
 158         u64 new, mask, tmp;
 159         u8 *m;
 160         int ret = 0;
 161
 162         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 163                 return 0;
 164
 165         m = addr;
 166         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 167                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 168                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 169
 170         m = local->hw.wiphy->addr_mask;
 171         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 172                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 173                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 174
 175         if (!check_dup)
 176                 return ret;
 177
 178         mutex_lock(&local->iflist_mtx);
 179         list_for_each_entry(iter, &local->interfaces, list) {
 180                 if (iter == sdata)
 181                         continue;
 182
 183                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 184                     !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 185                         continue;
 186
 187                 m = iter->vif.addr;
 188                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 189                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 190                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 191
 192                 if ((new & ~mask) != (tmp & ~mask)) {
 193                         ret = -EINVAL;
 194                         break;
 195                 }
 196         }
 197         mutex_unlock(&local->iflist_mtx);
 198
 199         return ret;
 200 }
 201
 202 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 203 {
 204         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 205         struct sockaddr *sa = addr;
 206         bool check_dup = true;
 207         int ret;
 208
 209         if (ieee80211_sdata_running(sdata))
 210                 return -EBUSY;
 211
 212         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 213             !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 214                 check_dup = false;
 215
 216         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 217         if (ret)
 218                 return ret;
 219
 220         ret = eth_mac_addr(dev, sa);
 221
 222         if (ret == 0)
 223                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 224
 225         return ret;
 226 }
 227
 228 static inline int identical_mac_addr_allowed(int type1, int type2)
 229 {
 230         return type1 == NL80211_IFTYPE_MONITOR ||
 231                 type2 == NL80211_IFTYPE_MONITOR ||
 232                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 233                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 234                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 235                 (type1 == NL80211_IFTYPE_WDS &&
 236                         (type2 == NL80211_IFTYPE_WDS ||
 237                          type2 == NL80211_IFTYPE_AP)) ||
 238                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 239                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 240                         (type2 == NL80211_IFTYPE_AP ||
 241                          type2 == NL80211_IFTYPE_AP_VLAN));
 242 }
 243
 244 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 245                                             enum nl80211_iftype iftype)
 246 {
 247         struct ieee80211_local *local = sdata->local;
 248         struct ieee80211_sub_if_data *nsdata;
 249         int ret;
 250
 251         ASSERT_RTNL();
 252
 253         /* we hold the RTNL here so can safely walk the list */
 254         list_for_each_entry(nsdata, &local->interfaces, list) {
 255                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 256                         /*
 257                          * Only OCB and monitor mode may coexist
 258                          */
 259                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
 260                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
 261                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 262                              nsdata->vif.type == NL80211_IFTYPE_OCB))
 263                                 return -EBUSY;
 264
 265                         /*
 266                          * Allow only a single IBSS interface to be up at any
 267                          * time. This is restricted because beacon distribution
 268                          * cannot work properly if both are in the same IBSS.
 269                          *
 270                          * To remove this restriction we'd have to disallow them
 271                          * from setting the same SSID on different IBSS interfaces
 272                          * belonging to the same hardware. Then, however, we're
 273                          * faced with having to adopt two different TSF timers...
 274                          */
 275                         if (iftype == NL80211_IFTYPE_ADHOC &&
 276                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 277                                 return -EBUSY;
 278                         /*
 279                          * will not add another interface while any channel
 280                          * switch is active.
 281                          */
 282                         if (nsdata->vif.csa_active)
 283                                 return -EBUSY;
 284
 285                         /*
 286                          * The remaining checks are only performed for interfaces
 287                          * with the same MAC address.
 288                          */
 289                         if (!ether_addr_equal(sdata->vif.addr,
 290                                               nsdata->vif.addr))
 291                                 continue;
 292
 293                         /*
 294                          * check whether it may have the same address
 295                          */
 296                         if (!identical_mac_addr_allowed(iftype,
 297                                                         nsdata->vif.type))
 298                                 return -ENOTUNIQ;
 299
 300                         /*
 301                          * can only add VLANs to enabled APs
 302                          */
 303                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 304                             nsdata->vif.type == NL80211_IFTYPE_AP)
 305                                 sdata->bss = &nsdata->u.ap;
 306                 }
 307         }
 308
 309         mutex_lock(&local->chanctx_mtx);
 310         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
 311         mutex_unlock(&local->chanctx_mtx);
 312         return ret;
 313 }
 314
 315 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 316                                   enum nl80211_iftype iftype)
 317 {
 318         int n_queues = sdata->local->hw.queues;
 319         int i;
 320
 321         if (iftype == NL80211_IFTYPE_NAN)
 322                 return 0;
 323
 324         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 325                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 326                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 327                                          IEEE80211_INVAL_HW_QUEUE))
 328                                 return -EINVAL;
 329                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 330                                          n_queues))
 331                                 return -EINVAL;
 332                 }
 333         }
 334
 335         if ((iftype != NL80211_IFTYPE_AP &&
 336              iftype != NL80211_IFTYPE_P2P_GO &&
 337              iftype != NL80211_IFTYPE_MESH_POINT) ||
 338             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
 339                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 340                 return 0;
 341         }
 342
 343         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 344                 return -EINVAL;
 345
 346         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 347                 return -EINVAL;
 348
 349         return 0;
 350 }
 351
 352 static int ieee80211_open(struct net_device *dev)
 353 {
 354         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 355         int err;
 356
 357         /* fail early if user set an invalid address */
 358         if (!is_valid_ether_addr(dev->dev_addr))
 359                 return -EADDRNOTAVAIL;
 360
 361         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 362         if (err)
 363                 return err;
 364
 365         return ieee80211_do_open(&sdata->wdev, true);
 366 }
 367
 368 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 369                               bool going_down)
 370 {
 371         struct ieee80211_local *local = sdata->local;
 372         unsigned long flags;
 373         struct sk_buff *skb, *tmp;
 374         u32 hw_reconf_flags = 0;
 375         int i, flushed;
 376         struct ps_data *ps;
 377         struct cfg80211_chan_def chandef;
 378         bool cancel_scan;
 379         struct cfg80211_nan_func *func;
 380
 381         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 382
 383         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 384         if (cancel_scan)
 385                 ieee80211_scan_cancel(local);
 386
 387         /*
 388          * Stop TX on this interface first.
 389          */
 390         if (sdata->dev)
 391                 netif_tx_stop_all_queues(sdata->dev);
 392
 393         ieee80211_roc_purge(local, sdata);
 394
 395         switch (sdata->vif.type) {
 396         case NL80211_IFTYPE_STATION:
 397                 ieee80211_mgd_stop(sdata);
 398                 break;
 399         case NL80211_IFTYPE_ADHOC:
 400                 ieee80211_ibss_stop(sdata);
 401                 break;
 402         case NL80211_IFTYPE_MONITOR:
 403                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
 404                         break;
 405                 list_del_rcu(&sdata->u.mntr.list);
 406                 break;
 407         default:
 408                 break;
 409         }
 410
 411         /*
 412          * Remove all stations associated with this interface.
 413          *
 414          * This must be done before calling ops->remove_interface()
 415          * because otherwise we can later invoke ops->sta_notify()
 416          * whenever the STAs are removed, and that invalidates driver
 417          * assumptions about always getting a vif pointer that is valid
 418          * (because if we remove a STA after ops->remove_interface()
 419          * the driver will have removed the vif info already!)
 420          *
 421          * In WDS mode a station must exist here and be flushed, for
 422          * AP_VLANs stations may exist since there's nothing else that
 423          * would have removed them, but in other modes there shouldn't
 424          * be any stations.
 425          */
 426         flushed = sta_info_flush(sdata);
 427         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
 428                      ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 429                       (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
 430
 431         /* don't count this interface for allmulti while it is down */
 432         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 433                 atomic_dec(&local->iff_allmultis);
 434
 435         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 436                 local->fif_pspoll--;
 437                 local->fif_probe_req--;
 438         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 439                 local->fif_probe_req--;
 440         }
 441
 442         if (sdata->dev) {
 443                 netif_addr_lock_bh(sdata->dev);
 444                 spin_lock_bh(&local->filter_lock);
 445                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 446                                  sdata->dev->addr_len);
 447                 spin_unlock_bh(&local->filter_lock);
 448                 netif_addr_unlock_bh(sdata->dev);
 449         }
 450
 451         del_timer_sync(&local->dynamic_ps_timer);
 452         cancel_work_sync(&local->dynamic_ps_enable_work);
 453
 454         cancel_work_sync(&sdata->recalc_smps);
 455         sdata_lock(sdata);
 456         mutex_lock(&local->mtx);
 457         sdata->vif.csa_active = false;
 458         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 459                 sdata->u.mgd.csa_waiting_bcn = false;
 460         if (sdata->csa_block_tx) {
 461                 ieee80211_wake_vif_queues(local, sdata,
 462                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 463                 sdata->csa_block_tx = false;
 464         }
 465         mutex_unlock(&local->mtx);
 466         sdata_unlock(sdata);
 467
 468         cancel_work_sync(&sdata->csa_finalize_work);
 469
 470         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 471
 472         if (sdata->wdev.cac_started) {
 473                 chandef = sdata->vif.bss_conf.chandef;
 474                 WARN_ON(local->suspended);
 475                 mutex_lock(&local->mtx);
 476                 ieee80211_vif_release_channel(sdata);
 477                 mutex_unlock(&local->mtx);
 478                 cfg80211_cac_event(sdata->dev, &chandef,
 479                                    NL80211_RADAR_CAC_ABORTED,
 480                                    GFP_KERNEL);
 481         }
 482
 483         /* APs need special treatment */
 484         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 485                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 486
 487                 /* down all dependent devices, that is VLANs */
 488                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 489                                          u.vlan.list)
 490                         dev_close(vlan->dev);
 491                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 492         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 493                 /* remove all packets in parent bc_buf pointing to this dev */
 494                 ps = &sdata->bss->ps;
 495
 496                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 497                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 498                         if (skb->dev == sdata->dev) {
 499                                 __skb_unlink(skb, &ps->bc_buf);
 500                                 local->total_ps_buffered--;
 501                                 ieee80211_free_txskb(&local->hw, skb);
 502                         }
 503                 }
 504                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 505         }
 506
 507         if (going_down)
 508                 local->open_count--;
 509
 510         switch (sdata->vif.type) {
 511         case NL80211_IFTYPE_AP_VLAN:
 512                 mutex_lock(&local->mtx);
 513                 list_del(&sdata->u.vlan.list);
 514                 mutex_unlock(&local->mtx);
 515                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 516                 /* see comment in the default case below */
 517                 ieee80211_free_keys(sdata, true);
 518                 /* no need to tell driver */
 519                 break;
 520         case NL80211_IFTYPE_MONITOR:
 521                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 522                         local->cooked_mntrs--;
 523                         break;
 524                 }
 525
 526                 local->monitors--;
 527                 if (local->monitors == 0) {
 528                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 529                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 530                 }
 531
 532                 ieee80211_adjust_monitor_flags(sdata, -1);
 533                 break;
 534         case NL80211_IFTYPE_NAN:
 535                 /* clean all the functions */
 536                 spin_lock_bh(&sdata->u.nan.func_lock);
 537
 538                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
 539                         idr_remove(&sdata->u.nan.function_inst_ids, i);
 540                         cfg80211_free_nan_func(func);
 541                 }
 542                 idr_destroy(&sdata->u.nan.function_inst_ids);
 543
 544                 spin_unlock_bh(&sdata->u.nan.func_lock);
 545                 break;
 546         case NL80211_IFTYPE_P2P_DEVICE:
 547                 /* relies on synchronize_rcu() below */
 548                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 549                 fallthrough;
 550         default:
 551                 cancel_work_sync(&sdata->work);
 552                 /*
 553                  * When we get here, the interface is marked down.
 554                  * Free the remaining keys, if there are any
 555                  * (which can happen in AP mode if userspace sets
 556                  * keys before the interface is operating, and maybe
 557                  * also in WDS mode)
 558                  *
 559                  * Force the key freeing to always synchronize_net()
 560                  * to wait for the RX path in case it is using this
 561                  * interface enqueuing frames at this very time on
 562                  * another CPU.
 563                  */
 564                 ieee80211_free_keys(sdata, true);
 565                 skb_queue_purge(&sdata->skb_queue);
 566         }
 567
 568         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 569         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 570                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 571                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 572                         if (info->control.vif == &sdata->vif) {
 573                                 __skb_unlink(skb, &local->pending[i]);
 574                                 ieee80211_free_txskb(&local->hw, skb);
 575                         }
 576                 }
 577         }
 578         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 579
 580         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 581                 ieee80211_txq_remove_vlan(local, sdata);
 582
 583         sdata->bss = NULL;
 584
 585         if (local->open_count == 0)
 586                 ieee80211_clear_tx_pending(local);
 587
 588         sdata->vif.bss_conf.beacon_int = 0;
 589
 590         /*
 591          * If the interface goes down while suspended, presumably because
 592          * the device was unplugged and that happens before our resume,
 593          * then the driver is already unconfigured and the remainder of
 594          * this function isn't needed.
 595          * XXX: what about WoWLAN? If the device has software state, e.g.
 596          *      memory allocated, it might expect teardown commands from
 597          *      mac80211 here?
 598          */
 599         if (local->suspended) {
 600                 WARN_ON(local->wowlan);
 601                 WARN_ON(rtnl_dereference(local->monitor_sdata));
 602                 return;
 603         }
 604
 605         switch (sdata->vif.type) {
 606         case NL80211_IFTYPE_AP_VLAN:
 607                 break;
 608         case NL80211_IFTYPE_MONITOR:
 609                 if (local->monitors == 0)
 610                         ieee80211_del_virtual_monitor(local);
 611
 612                 mutex_lock(&local->mtx);
 613                 ieee80211_recalc_idle(local);
 614                 mutex_unlock(&local->mtx);
 615
 616                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 617                         break;
 618
 619                 fallthrough;
 620         default:
 621                 if (going_down)
 622                         drv_remove_interface(local, sdata);
 623         }
 624
 625         ieee80211_recalc_ps(local);
 626
 627         if (cancel_scan)
 628                 flush_delayed_work(&local->scan_work);
 629
 630         if (local->open_count == 0) {
 631                 ieee80211_stop_device(local);
 632
 633                 /* no reconfiguring after stop! */
 634                 return;
 635         }
 636
 637         /* do after stop to avoid reconfiguring when we stop anyway */
 638         ieee80211_configure_filter(local);
 639         ieee80211_hw_config(local, hw_reconf_flags);
 640
 641         if (local->monitors == local->open_count)
 642                 ieee80211_add_virtual_monitor(local);
 643 }
 644
 645 static int ieee80211_stop(struct net_device *dev)
 646 {
 647         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 648
 649         ieee80211_do_stop(sdata, true);
 650
 651         return 0;
 652 }
 653
 654 static void ieee80211_set_multicast_list(struct net_device *dev)
 655 {
 656         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 657         struct ieee80211_local *local = sdata->local;
 658         int allmulti, sdata_allmulti;
 659
 660         allmulti = !!(dev->flags & IFF_ALLMULTI);
 661         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 662
 663         if (allmulti != sdata_allmulti) {
 664                 if (dev->flags & IFF_ALLMULTI)
 665                         atomic_inc(&local->iff_allmultis);
 666                 else
 667                         atomic_dec(&local->iff_allmultis);
 668                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 669         }
 670
 671         spin_lock_bh(&local->filter_lock);
 672         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 673         spin_unlock_bh(&local->filter_lock);
 674         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 675 }
 676
 677 /*
 678  * Called when the netdev is removed or, by the code below, before
 679  * the interface type changes.
 680  */
 681 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 682 {
 683         /* free extra data */
 684         ieee80211_free_keys(sdata, false);
 685
 686         ieee80211_debugfs_remove_netdev(sdata);
 687
 688         ieee80211_destroy_frag_cache(&sdata->frags);
 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_encap_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_encap_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 (sdata->vif.offload_flags == flags)
 807                 return false;
 808
 809         sdata->vif.offload_flags = flags;
 810         return true;
 811 }
 812
 813 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
 814 {
 815         struct ieee80211_local *local = sdata->local;
 816         struct ieee80211_sub_if_data *bss = sdata;
 817         bool enabled;
 818
 819         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 820                 if (!sdata->bss)
 821                         return;
 822
 823                 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
 824         }
 825
 826         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
 827             !ieee80211_iftype_supports_encap_offload(bss->vif.type))
 828                 return;
 829
 830         enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
 831         if (sdata->wdev.use_4addr &&
 832             !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
 833                 enabled = false;
 834
 835         sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
 836                                            &ieee80211_dataif_ops;
 837 }
 838
 839 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
 840 {
 841         struct ieee80211_local *local = sdata->local;
 842         struct ieee80211_sub_if_data *vsdata;
 843
 844         if (ieee80211_set_sdata_offload_flags(sdata)) {
 845                 drv_update_vif_offload(local, sdata);
 846                 ieee80211_set_vif_encap_ops(sdata);
 847         }
 848
 849         list_for_each_entry(vsdata, &local->interfaces, list) {
 850                 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
 851                     vsdata->bss != &sdata->u.ap)
 852                         continue;
 853
 854                 ieee80211_set_vif_encap_ops(vsdata);
 855         }
 856 }
 857
 858 void ieee80211_recalc_offload(struct ieee80211_local *local)
 859 {
 860         struct ieee80211_sub_if_data *sdata;
 861
 862         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
 863                 return;
 864
 865         mutex_lock(&local->iflist_mtx);
 866
 867         list_for_each_entry(sdata, &local->interfaces, list) {
 868                 if (!ieee80211_sdata_running(sdata))
 869                         continue;
 870
 871                 ieee80211_recalc_sdata_offload(sdata);
 872         }
 873
 874         mutex_unlock(&local->iflist_mtx);
 875 }
 876
 877 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 878                                     const int offset)
 879 {
 880         struct ieee80211_local *local = sdata->local;
 881         u32 flags = sdata->u.mntr.flags;
 882
 883 #define ADJUST(_f, _s)  do {                                    \
 884         if (flags & MONITOR_FLAG_##_f)                          \
 885                 local->fif_##_s += offset;                      \
 886         } while (0)
 887
 888         ADJUST(FCSFAIL, fcsfail);
 889         ADJUST(PLCPFAIL, plcpfail);
 890         ADJUST(CONTROL, control);
 891         ADJUST(CONTROL, pspoll);
 892         ADJUST(OTHER_BSS, other_bss);
 893
 894 #undef ADJUST
 895 }
 896
 897 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 898 {
 899         struct ieee80211_local *local = sdata->local;
 900         int i;
 901
 902         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 903                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
 904                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 905                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 906                         sdata->vif.hw_queue[i] = i;
 907                 else
 908                         sdata->vif.hw_queue[i] = 0;
 909         }
 910         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 911 }
 912
 913 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 914 {
 915         struct ieee80211_sub_if_data *sdata;
 916         int ret;
 917
 918         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 919                 return 0;
 920
 921         ASSERT_RTNL();
 922
 923         if (local->monitor_sdata)
 924                 return 0;
 925
 926         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 927         if (!sdata)
 928                 return -ENOMEM;
 929
 930         /* set up data */
 931         sdata->local = local;
 932         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 933         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 934                  wiphy_name(local->hw.wiphy));
 935         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
 936
 937         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 938
 939         ieee80211_set_default_queues(sdata);
 940
 941         ret = drv_add_interface(local, sdata);
 942         if (WARN_ON(ret)) {
 943                 /* ok .. stupid driver, it asked for this! */
 944                 kfree(sdata);
 945                 return ret;
 946         }
 947
 948         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 949
 950         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 951         if (ret) {
 952                 kfree(sdata);
 953                 return ret;
 954         }
 955
 956         mutex_lock(&local->iflist_mtx);
 957         rcu_assign_pointer(local->monitor_sdata, sdata);
 958         mutex_unlock(&local->iflist_mtx);
 959
 960         mutex_lock(&local->mtx);
 961         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 962                                         IEEE80211_CHANCTX_EXCLUSIVE);
 963         mutex_unlock(&local->mtx);
 964         if (ret) {
 965                 mutex_lock(&local->iflist_mtx);
 966                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
 967                 mutex_unlock(&local->iflist_mtx);
 968                 synchronize_net();
 969                 drv_remove_interface(local, sdata);
 970                 kfree(sdata);
 971                 return ret;
 972         }
 973
 974         skb_queue_head_init(&sdata->skb_queue);
 975         INIT_WORK(&sdata->work, ieee80211_iface_work);
 976
 977         return 0;
 978 }
 979
 980 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 981 {
 982         struct ieee80211_sub_if_data *sdata;
 983
 984         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 985                 return;
 986
 987         ASSERT_RTNL();
 988
 989         mutex_lock(&local->iflist_mtx);
 990
 991         sdata = rcu_dereference_protected(local->monitor_sdata,
 992                                           lockdep_is_held(&local->iflist_mtx));
 993         if (!sdata) {
 994                 mutex_unlock(&local->iflist_mtx);
 995                 return;
 996         }
 997
 998         RCU_INIT_POINTER(local->monitor_sdata, NULL);
 999         mutex_unlock(&local->iflist_mtx);
1000
1001         synchronize_net();
1002
1003         mutex_lock(&local->mtx);
1004         ieee80211_vif_release_channel(sdata);
1005         mutex_unlock(&local->mtx);
1006
1007         drv_remove_interface(local, sdata);
1008
1009         kfree(sdata);
1010 }
1011
1012 /*
1013  * NOTE: Be very careful when changing this function, it must NOT return
1014  * an error on interface type changes that have been pre-checked, so most
1015  * checks should be in ieee80211_check_concurrent_iface.
1016  */
1017 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1018 {
1019         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1020         struct net_device *dev = wdev->netdev;
1021         struct ieee80211_local *local = sdata->local;
1022         struct sta_info *sta;
1023         u32 changed = 0;
1024         int res;
1025         u32 hw_reconf_flags = 0;
1026
1027         switch (sdata->vif.type) {
1028         case NL80211_IFTYPE_WDS:
1029                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
1030                         return -ENOLINK;
1031                 break;
1032         case NL80211_IFTYPE_AP_VLAN: {
1033                 struct ieee80211_sub_if_data *master;
1034
1035                 if (!sdata->bss)
1036                         return -ENOLINK;
1037
1038                 mutex_lock(&local->mtx);
1039                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1040                 mutex_unlock(&local->mtx);
1041
1042                 master = container_of(sdata->bss,
1043                                       struct ieee80211_sub_if_data, u.ap);
1044                 sdata->control_port_protocol =
1045                         master->control_port_protocol;
1046                 sdata->control_port_no_encrypt =
1047                         master->control_port_no_encrypt;
1048                 sdata->control_port_over_nl80211 =
1049                         master->control_port_over_nl80211;
1050                 sdata->control_port_no_preauth =
1051                         master->control_port_no_preauth;
1052                 sdata->vif.cab_queue = master->vif.cab_queue;
1053                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1054                        sizeof(sdata->vif.hw_queue));
1055                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1056
1057                 mutex_lock(&local->key_mtx);
1058                 sdata->crypto_tx_tailroom_needed_cnt +=
1059                         master->crypto_tx_tailroom_needed_cnt;
1060                 mutex_unlock(&local->key_mtx);
1061
1062                 break;
1063                 }
1064         case NL80211_IFTYPE_AP:
1065                 sdata->bss = &sdata->u.ap;
1066                 break;
1067         case NL80211_IFTYPE_MESH_POINT:
1068         case NL80211_IFTYPE_STATION:
1069         case NL80211_IFTYPE_MONITOR:
1070         case NL80211_IFTYPE_ADHOC:
1071         case NL80211_IFTYPE_P2P_DEVICE:
1072         case NL80211_IFTYPE_OCB:
1073         case NL80211_IFTYPE_NAN:
1074                 /* no special treatment */
1075                 break;
1076         case NL80211_IFTYPE_UNSPECIFIED:
1077         case NUM_NL80211_IFTYPES:
1078         case NL80211_IFTYPE_P2P_CLIENT:
1079         case NL80211_IFTYPE_P2P_GO:
1080                 /* cannot happen */
1081                 WARN_ON(1);
1082                 break;
1083         }
1084
1085         if (local->open_count == 0) {
1086                 res = drv_start(local);
1087                 if (res)
1088                         goto err_del_bss;
1089                 /* we're brought up, everything changes */
1090                 hw_reconf_flags = ~0;
1091                 ieee80211_led_radio(local, true);
1092                 ieee80211_mod_tpt_led_trig(local,
1093                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1094         }
1095
1096         /*
1097          * Copy the hopefully now-present MAC address to
1098          * this interface, if it has the special null one.
1099          */
1100         if (dev && is_zero_ether_addr(dev->dev_addr)) {
1101                 memcpy(dev->dev_addr,
1102                        local->hw.wiphy->perm_addr,
1103                        ETH_ALEN);
1104                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1105
1106                 if (!is_valid_ether_addr(dev->dev_addr)) {
1107                         res = -EADDRNOTAVAIL;
1108                         goto err_stop;
1109                 }
1110         }
1111
1112         switch (sdata->vif.type) {
1113         case NL80211_IFTYPE_AP_VLAN:
1114                 /* no need to tell driver, but set carrier and chanctx */
1115                 if (rtnl_dereference(sdata->bss->beacon)) {
1116                         ieee80211_vif_vlan_copy_chanctx(sdata);
1117                         netif_carrier_on(dev);
1118                         ieee80211_set_vif_encap_ops(sdata);
1119                 } else {
1120                         netif_carrier_off(dev);
1121                 }
1122                 break;
1123         case NL80211_IFTYPE_MONITOR:
1124                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1125                         local->cooked_mntrs++;
1126                         break;
1127                 }
1128
1129                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1130                         res = drv_add_interface(local, sdata);
1131                         if (res)
1132                                 goto err_stop;
1133                 } else if (local->monitors == 0 && local->open_count == 0) {
1134                         res = ieee80211_add_virtual_monitor(local);
1135                         if (res)
1136                                 goto err_stop;
1137                 }
1138
1139                 /* must be before the call to ieee80211_configure_filter */
1140                 local->monitors++;
1141                 if (local->monitors == 1) {
1142                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1143                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1144                 }
1145
1146                 ieee80211_adjust_monitor_flags(sdata, 1);
1147                 ieee80211_configure_filter(local);
1148                 ieee80211_recalc_offload(local);
1149                 mutex_lock(&local->mtx);
1150                 ieee80211_recalc_idle(local);
1151                 mutex_unlock(&local->mtx);
1152
1153                 netif_carrier_on(dev);
1154                 break;
1155         default:
1156                 if (coming_up) {
1157                         ieee80211_del_virtual_monitor(local);
1158                         ieee80211_set_sdata_offload_flags(sdata);
1159
1160                         res = drv_add_interface(local, sdata);
1161                         if (res)
1162                                 goto err_stop;
1163
1164                         ieee80211_set_vif_encap_ops(sdata);
1165                         res = ieee80211_check_queues(sdata,
1166                                 ieee80211_vif_type_p2p(&sdata->vif));
1167                         if (res)
1168                                 goto err_del_interface;
1169                 }
1170
1171                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1172                         local->fif_pspoll++;
1173                         local->fif_probe_req++;
1174
1175                         ieee80211_configure_filter(local);
1176                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1177                         local->fif_probe_req++;
1178                 }
1179
1180                 if (sdata->vif.probe_req_reg)
1181                         drv_config_iface_filter(local, sdata,
1182                                                 FIF_PROBE_REQ,
1183                                                 FIF_PROBE_REQ);
1184
1185                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1186                     sdata->vif.type != NL80211_IFTYPE_NAN)
1187                         changed |= ieee80211_reset_erp_info(sdata);
1188                 ieee80211_bss_info_change_notify(sdata, changed);
1189
1190                 switch (sdata->vif.type) {
1191                 case NL80211_IFTYPE_STATION:
1192                 case NL80211_IFTYPE_ADHOC:
1193                 case NL80211_IFTYPE_AP:
1194                 case NL80211_IFTYPE_MESH_POINT:
1195                 case NL80211_IFTYPE_OCB:
1196                         netif_carrier_off(dev);
1197                         break;
1198                 case NL80211_IFTYPE_WDS:
1199                 case NL80211_IFTYPE_P2P_DEVICE:
1200                 case NL80211_IFTYPE_NAN:
1201                         break;
1202                 default:
1203                         /* not reached */
1204                         WARN_ON(1);
1205                 }
1206
1207                 /*
1208                  * Set default queue parameters so drivers don't
1209                  * need to initialise the hardware if the hardware
1210                  * doesn't start up with sane defaults.
1211                  * Enable QoS for anything but station interfaces.
1212                  */
1213                 ieee80211_set_wmm_default(sdata, true,
1214                         sdata->vif.type != NL80211_IFTYPE_STATION);
1215         }
1216
1217         set_bit(SDATA_STATE_RUNNING, &sdata->state);
1218
1219         switch (sdata->vif.type) {
1220         case NL80211_IFTYPE_WDS:
1221                 /* Create STA entry for the WDS peer */
1222                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
1223                                      GFP_KERNEL);
1224                 if (!sta) {
1225                         res = -ENOMEM;
1226                         goto err_del_interface;
1227                 }
1228
1229                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
1230                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
1231                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
1232
1233                 res = sta_info_insert(sta);
1234                 if (res) {
1235                         /* STA has been freed */
1236                         goto err_del_interface;
1237                 }
1238
1239                 rate_control_rate_init(sta);
1240                 netif_carrier_on(dev);
1241                 break;
1242         case NL80211_IFTYPE_P2P_DEVICE:
1243                 rcu_assign_pointer(local->p2p_sdata, sdata);
1244                 break;
1245         case NL80211_IFTYPE_MONITOR:
1246                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1247                         break;
1248                 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1249                 break;
1250         default:
1251                 break;
1252         }
1253
1254         /*
1255          * set_multicast_list will be invoked by the networking core
1256          * which will check whether any increments here were done in
1257          * error and sync them down to the hardware as filter flags.
1258          */
1259         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1260                 atomic_inc(&local->iff_allmultis);
1261
1262         if (coming_up)
1263                 local->open_count++;
1264
1265         if (hw_reconf_flags)
1266                 ieee80211_hw_config(local, hw_reconf_flags);
1267
1268         ieee80211_recalc_ps(local);
1269
1270         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1271             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1272             local->ops->wake_tx_queue) {
1273                 /* XXX: for AP_VLAN, actually track AP queues */
1274                 if (dev)
1275                         netif_tx_start_all_queues(dev);
1276         } else if (dev) {
1277                 unsigned long flags;
1278                 int n_acs = IEEE80211_NUM_ACS;
1279                 int ac;
1280
1281                 if (local->hw.queues < IEEE80211_NUM_ACS)
1282                         n_acs = 1;
1283
1284                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1285                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
1286                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
1287                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
1288                         for (ac = 0; ac < n_acs; ac++) {
1289                                 int ac_queue = sdata->vif.hw_queue[ac];
1290
1291                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
1292                                     skb_queue_empty(&local->pending[ac_queue]))
1293                                         netif_start_subqueue(dev, ac);
1294                         }
1295                 }
1296                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1297         }
1298
1299         return 0;
1300  err_del_interface:
1301         drv_remove_interface(local, sdata);
1302  err_stop:
1303         if (!local->open_count)
1304                 drv_stop(local);
1305  err_del_bss:
1306         sdata->bss = NULL;
1307         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1308                 mutex_lock(&local->mtx);
1309                 list_del(&sdata->u.vlan.list);
1310                 mutex_unlock(&local->mtx);
1311         }
1312         /* might already be clear but that doesn't matter */
1313         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1314         return res;
1315 }
1316
1317 static void ieee80211_if_free(struct net_device *dev)
1318 {
1319         free_percpu(dev->tstats);
1320 }
1321
1322 static void ieee80211_if_setup(struct net_device *dev)
1323 {
1324         ether_setup(dev);
1325         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1326         dev->netdev_ops = &ieee80211_dataif_ops;
1327         dev->needs_free_netdev = true;
1328         dev->priv_destructor = ieee80211_if_free;
1329 }
1330
1331 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1332 {
1333         ieee80211_if_setup(dev);
1334         dev->priv_flags |= IFF_NO_QUEUE;
1335 }
1336
1337 static void ieee80211_iface_work(struct work_struct *work)
1338 {
1339         struct ieee80211_sub_if_data *sdata =
1340                 container_of(work, struct ieee80211_sub_if_data, work);
1341         struct ieee80211_local *local = sdata->local;
1342         struct sk_buff *skb;
1343         struct sta_info *sta;
1344
1345         if (!ieee80211_sdata_running(sdata))
1346                 return;
1347
1348         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1349                 return;
1350
1351         if (!ieee80211_can_run_worker(local))
1352                 return;
1353
1354         /* first process frames */
1355         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1356                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1357
1358                 if (ieee80211_is_action(mgmt->frame_control) &&
1359                     mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1360                         int len = skb->len;
1361
1362                         mutex_lock(&local->sta_mtx);
1363                         sta = sta_info_get_bss(sdata, mgmt->sa);
1364                         if (sta) {
1365                                 switch (mgmt->u.action.u.addba_req.action_code) {
1366                                 case WLAN_ACTION_ADDBA_REQ:
1367                                         ieee80211_process_addba_request(
1368                                                         local, sta, mgmt, len);
1369                                         break;
1370                                 case WLAN_ACTION_ADDBA_RESP:
1371                                         ieee80211_process_addba_resp(local, sta,
1372                                                                      mgmt, len);
1373                                         break;
1374                                 case WLAN_ACTION_DELBA:
1375                                         ieee80211_process_delba(sdata, sta,
1376                                                                 mgmt, len);
1377                                         break;
1378                                 default:
1379                                         WARN_ON(1);
1380                                         break;
1381                                 }
1382                         }
1383                         mutex_unlock(&local->sta_mtx);
1384                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1385                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1386                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1387                         case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1388                                 struct ieee80211_rx_status *status;
1389                                 enum nl80211_band band;
1390                                 u8 opmode;
1391
1392                                 status = IEEE80211_SKB_RXCB(skb);
1393                                 band = status->band;
1394                                 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1395
1396                                 mutex_lock(&local->sta_mtx);
1397                                 sta = sta_info_get_bss(sdata, mgmt->sa);
1398
1399                                 if (sta)
1400                                         ieee80211_vht_handle_opmode(sdata, sta,
1401                                                                     opmode,
1402                                                                     band);
1403
1404                                 mutex_unlock(&local->sta_mtx);
1405                                 break;
1406                         }
1407                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1408                                 ieee80211_process_mu_groups(sdata, mgmt);
1409                                 break;
1410                         default:
1411                                 WARN_ON(1);
1412                                 break;
1413                         }
1414                 } else if (ieee80211_is_ext(mgmt->frame_control)) {
1415                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
1416                                 ieee80211_sta_rx_queued_ext(sdata, skb);
1417                         else
1418                                 WARN_ON(1);
1419                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1420                         struct ieee80211_hdr *hdr = (void *)mgmt;
1421                         /*
1422                          * So the frame isn't mgmt, but frame_control
1423                          * is at the right place anyway, of course, so
1424                          * the if statement is correct.
1425                          *
1426                          * Warn if we have other data frame types here,
1427                          * they must not get here.
1428                          */
1429                         WARN_ON(hdr->frame_control &
1430                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1431                         WARN_ON(!(hdr->seq_ctrl &
1432                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1433                         /*
1434                          * This was a fragment of a frame, received while
1435                          * a block-ack session was active. That cannot be
1436                          * right, so terminate the session.
1437                          */
1438                         mutex_lock(&local->sta_mtx);
1439                         sta = sta_info_get_bss(sdata, mgmt->sa);
1440                         if (sta) {
1441                                 u16 tid = ieee80211_get_tid(hdr);
1442
1443                                 __ieee80211_stop_rx_ba_session(
1444                                         sta, tid, WLAN_BACK_RECIPIENT,
1445                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1446                                         true);
1447                         }
1448                         mutex_unlock(&local->sta_mtx);
1449                 } else switch (sdata->vif.type) {
1450                 case NL80211_IFTYPE_STATION:
1451                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1452                         break;
1453                 case NL80211_IFTYPE_ADHOC:
1454                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1455                         break;
1456                 case NL80211_IFTYPE_MESH_POINT:
1457                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1458                                 break;
1459                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1460                         break;
1461                 default:
1462                         WARN(1, "frame for unexpected interface type");
1463                         break;
1464                 }
1465
1466                 kfree_skb(skb);
1467         }
1468
1469         /* then other type-dependent work */
1470         switch (sdata->vif.type) {
1471         case NL80211_IFTYPE_STATION:
1472                 ieee80211_sta_work(sdata);
1473                 break;
1474         case NL80211_IFTYPE_ADHOC:
1475                 ieee80211_ibss_work(sdata);
1476                 break;
1477         case NL80211_IFTYPE_MESH_POINT:
1478                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1479                         break;
1480                 ieee80211_mesh_work(sdata);
1481                 break;
1482         case NL80211_IFTYPE_OCB:
1483                 ieee80211_ocb_work(sdata);
1484                 break;
1485         default:
1486                 break;
1487         }
1488 }
1489
1490 static void ieee80211_recalc_smps_work(struct work_struct *work)
1491 {
1492         struct ieee80211_sub_if_data *sdata =
1493                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1494
1495         ieee80211_recalc_smps(sdata);
1496 }
1497
1498 /*
1499  * Helper function to initialise an interface to a specific type.
1500  */
1501 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1502                                   enum nl80211_iftype type)
1503 {
1504         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1505                                                     0xff, 0xff, 0xff};
1506
1507         /* clear type-dependent union */
1508         memset(&sdata->u, 0, sizeof(sdata->u));
1509
1510         /* and set some type-dependent values */
1511         sdata->vif.type = type;
1512         sdata->vif.p2p = false;
1513         sdata->wdev.iftype = type;
1514
1515         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1516         sdata->control_port_no_encrypt = false;
1517         sdata->control_port_over_nl80211 = false;
1518         sdata->control_port_no_preauth = false;
1519         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1520         sdata->vif.bss_conf.idle = true;
1521         sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1522
1523         sdata->noack_map = 0;
1524
1525         /* only monitor/p2p-device differ */
1526         if (sdata->dev) {
1527                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1528                 sdata->dev->type = ARPHRD_ETHER;
1529         }
1530
1531         skb_queue_head_init(&sdata->skb_queue);
1532         INIT_WORK(&sdata->work, ieee80211_iface_work);
1533         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1534         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1535         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1536         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1537
1538         switch (type) {
1539         case NL80211_IFTYPE_P2P_GO:
1540                 type = NL80211_IFTYPE_AP;
1541                 sdata->vif.type = type;
1542                 sdata->vif.p2p = true;
1543                 fallthrough;
1544         case NL80211_IFTYPE_AP:
1545                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1546                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1547                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1548                 break;
1549         case NL80211_IFTYPE_P2P_CLIENT:
1550                 type = NL80211_IFTYPE_STATION;
1551                 sdata->vif.type = type;
1552                 sdata->vif.p2p = true;
1553                 fallthrough;
1554         case NL80211_IFTYPE_STATION:
1555                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1556                 ieee80211_sta_setup_sdata(sdata);
1557                 break;
1558         case NL80211_IFTYPE_OCB:
1559                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1560                 ieee80211_ocb_setup_sdata(sdata);
1561                 break;
1562         case NL80211_IFTYPE_ADHOC:
1563                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1564                 ieee80211_ibss_setup_sdata(sdata);
1565                 break;
1566         case NL80211_IFTYPE_MESH_POINT:
1567                 if (ieee80211_vif_is_mesh(&sdata->vif))
1568                         ieee80211_mesh_init_sdata(sdata);
1569                 break;
1570         case NL80211_IFTYPE_MONITOR:
1571                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1572                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1573                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1574                                       MONITOR_FLAG_OTHER_BSS;
1575                 break;
1576         case NL80211_IFTYPE_WDS:
1577                 sdata->vif.bss_conf.bssid = NULL;
1578                 break;
1579         case NL80211_IFTYPE_NAN:
1580                 idr_init(&sdata->u.nan.function_inst_ids);
1581                 spin_lock_init(&sdata->u.nan.func_lock);
1582                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1583                 break;
1584         case NL80211_IFTYPE_AP_VLAN:
1585         case NL80211_IFTYPE_P2P_DEVICE:
1586                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1587                 break;
1588         case NL80211_IFTYPE_UNSPECIFIED:
1589         case NUM_NL80211_IFTYPES:
1590                 WARN_ON(1);
1591                 break;
1592         }
1593
1594         ieee80211_debugfs_add_netdev(sdata);
1595 }
1596
1597 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1598                                            enum nl80211_iftype type)
1599 {
1600         struct ieee80211_local *local = sdata->local;
1601         int ret, err;
1602         enum nl80211_iftype internal_type = type;
1603         bool p2p = false;
1604
1605         ASSERT_RTNL();
1606
1607         if (!local->ops->change_interface)
1608                 return -EBUSY;
1609
1610         switch (sdata->vif.type) {
1611         case NL80211_IFTYPE_AP:
1612         case NL80211_IFTYPE_STATION:
1613         case NL80211_IFTYPE_ADHOC:
1614         case NL80211_IFTYPE_OCB:
1615                 /*
1616                  * Could maybe also all others here?
1617                  * Just not sure how that interacts
1618                  * with the RX/config path e.g. for
1619                  * mesh.
1620                  */
1621                 break;
1622         default:
1623                 return -EBUSY;
1624         }
1625
1626         switch (type) {
1627         case NL80211_IFTYPE_AP:
1628         case NL80211_IFTYPE_STATION:
1629         case NL80211_IFTYPE_ADHOC:
1630         case NL80211_IFTYPE_OCB:
1631                 /*
1632                  * Could probably support everything
1633                  * but WDS here (WDS do_open can fail
1634                  * under memory pressure, which this
1635                  * code isn't prepared to handle).
1636                  */
1637                 break;
1638         case NL80211_IFTYPE_P2P_CLIENT:
1639                 p2p = true;
1640                 internal_type = NL80211_IFTYPE_STATION;
1641                 break;
1642         case NL80211_IFTYPE_P2P_GO:
1643                 p2p = true;
1644                 internal_type = NL80211_IFTYPE_AP;
1645                 break;
1646         default:
1647                 return -EBUSY;
1648         }
1649
1650         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1651         if (ret)
1652                 return ret;
1653
1654         ieee80211_stop_vif_queues(local, sdata,
1655                                   IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1656         synchronize_net();
1657
1658         ieee80211_do_stop(sdata, false);
1659
1660         ieee80211_teardown_sdata(sdata);
1661
1662         ieee80211_set_sdata_offload_flags(sdata);
1663         ret = drv_change_interface(local, sdata, internal_type, p2p);
1664         if (ret)
1665                 type = ieee80211_vif_type_p2p(&sdata->vif);
1666
1667         /*
1668          * Ignore return value here, there's not much we can do since
1669          * the driver changed the interface type internally already.
1670          * The warnings will hopefully make driver authors fix it :-)
1671          */
1672         ieee80211_check_queues(sdata, type);
1673
1674         ieee80211_setup_sdata(sdata, type);
1675         ieee80211_set_vif_encap_ops(sdata);
1676
1677         err = ieee80211_do_open(&sdata->wdev, false);
1678         WARN(err, "type change: do_open returned %d", err);
1679
1680         ieee80211_wake_vif_queues(local, sdata,
1681                                   IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1682         return ret;
1683 }
1684
1685 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1686                              enum nl80211_iftype type)
1687 {
1688         int ret;
1689
1690         ASSERT_RTNL();
1691
1692         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1693                 return 0;
1694
1695         if (ieee80211_sdata_running(sdata)) {
1696                 ret = ieee80211_runtime_change_iftype(sdata, type);
1697                 if (ret)
1698                         return ret;
1699         } else {
1700                 /* Purge and reset type-dependent state. */
1701                 ieee80211_teardown_sdata(sdata);
1702                 ieee80211_setup_sdata(sdata, type);
1703         }
1704
1705         /* reset some values that shouldn't be kept across type changes */
1706         if (type == NL80211_IFTYPE_STATION)
1707                 sdata->u.mgd.use_4addr = false;
1708
1709         return 0;
1710 }
1711
1712 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1713                                        u8 *perm_addr, enum nl80211_iftype type)
1714 {
1715         struct ieee80211_sub_if_data *sdata;
1716         u64 mask, start, addr, val, inc;
1717         u8 *m;
1718         u8 tmp_addr[ETH_ALEN];
1719         int i;
1720
1721         /* default ... something at least */
1722         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1723
1724         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1725             local->hw.wiphy->n_addresses <= 1)
1726                 return;
1727
1728         mutex_lock(&local->iflist_mtx);
1729
1730         switch (type) {
1731         case NL80211_IFTYPE_MONITOR:
1732                 /* doesn't matter */
1733                 break;
1734         case NL80211_IFTYPE_WDS:
1735         case NL80211_IFTYPE_AP_VLAN:
1736                 /* match up with an AP interface */
1737                 list_for_each_entry(sdata, &local->interfaces, list) {
1738                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1739                                 continue;
1740                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1741                         break;
1742                 }
1743                 /* keep default if no AP interface present */
1744                 break;
1745         case NL80211_IFTYPE_P2P_CLIENT:
1746         case NL80211_IFTYPE_P2P_GO:
1747                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1748                         list_for_each_entry(sdata, &local->interfaces, list) {
1749                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1750                                         continue;
1751                                 if (!ieee80211_sdata_running(sdata))
1752                                         continue;
1753                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1754                                 goto out_unlock;
1755                         }
1756                 }
1757                 fallthrough;
1758         default:
1759                 /* assign a new address if possible -- try n_addresses first */
1760                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1761                         bool used = false;
1762
1763                         list_for_each_entry(sdata, &local->interfaces, list) {
1764                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1765                                                      sdata->vif.addr)) {
1766                                         used = true;
1767                                         break;
1768                                 }
1769                         }
1770
1771                         if (!used) {
1772                                 memcpy(perm_addr,
1773                                        local->hw.wiphy->addresses[i].addr,
1774                                        ETH_ALEN);
1775                                 break;
1776                         }
1777                 }
1778
1779                 /* try mask if available */
1780                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1781                         break;
1782
1783                 m = local->hw.wiphy->addr_mask;
1784                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1785                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1786                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1787
1788                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1789                         /* not a contiguous mask ... not handled now! */
1790                         pr_info("not contiguous\n");
1791                         break;
1792                 }
1793
1794                 /*
1795                  * Pick address of existing interface in case user changed
1796                  * MAC address manually, default to perm_addr.
1797                  */
1798                 m = local->hw.wiphy->perm_addr;
1799                 list_for_each_entry(sdata, &local->interfaces, list) {
1800                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1801                                 continue;
1802                         m = sdata->vif.addr;
1803                         break;
1804                 }
1805                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1806                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1807                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1808
1809                 inc = 1ULL<<__ffs64(mask);
1810                 val = (start & mask);
1811                 addr = (start & ~mask) | (val & mask);
1812                 do {
1813                         bool used = false;
1814
1815                         tmp_addr[5] = addr >> 0*8;
1816                         tmp_addr[4] = addr >> 1*8;
1817                         tmp_addr[3] = addr >> 2*8;
1818                         tmp_addr[2] = addr >> 3*8;
1819                         tmp_addr[1] = addr >> 4*8;
1820                         tmp_addr[0] = addr >> 5*8;
1821
1822                         val += inc;
1823
1824                         list_for_each_entry(sdata, &local->interfaces, list) {
1825                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1826                                         used = true;
1827                                         break;
1828                                 }
1829                         }
1830
1831                         if (!used) {
1832                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1833                                 break;
1834                         }
1835                         addr = (start & ~mask) | (val & mask);
1836                 } while (addr != start);
1837
1838                 break;
1839         }
1840
1841  out_unlock:
1842         mutex_unlock(&local->iflist_mtx);
1843 }
1844
1845 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1846                      unsigned char name_assign_type,
1847                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1848                      struct vif_params *params)
1849 {
1850         struct net_device *ndev = NULL;
1851         struct ieee80211_sub_if_data *sdata = NULL;
1852         struct txq_info *txqi;
1853         void (*if_setup)(struct net_device *dev);
1854         int ret, i;
1855         int txqs = 1;
1856
1857         ASSERT_RTNL();
1858
1859         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1860                 struct wireless_dev *wdev;
1861
1862                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1863                                 GFP_KERNEL);
1864                 if (!sdata)
1865                         return -ENOMEM;
1866                 wdev = &sdata->wdev;
1867
1868                 sdata->dev = NULL;
1869                 strlcpy(sdata->name, name, IFNAMSIZ);
1870                 ieee80211_assign_perm_addr(local, wdev->address, type);
1871                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1872         } else {
1873                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1874                                  sizeof(void *));
1875                 int txq_size = 0;
1876
1877                 if (local->ops->wake_tx_queue &&
1878                     type != NL80211_IFTYPE_AP_VLAN &&
1879                     (type != NL80211_IFTYPE_MONITOR ||
1880                      (params->flags & MONITOR_FLAG_ACTIVE)))
1881                         txq_size += sizeof(struct txq_info) +
1882                                     local->hw.txq_data_size;
1883
1884                 if (local->ops->wake_tx_queue) {
1885                         if_setup = ieee80211_if_setup_no_queue;
1886                 } else {
1887                         if_setup = ieee80211_if_setup;
1888                         if (local->hw.queues >= IEEE80211_NUM_ACS)
1889                                 txqs = IEEE80211_NUM_ACS;
1890                 }
1891
1892                 ndev = alloc_netdev_mqs(size + txq_size,
1893                                         name, name_assign_type,
1894                                         if_setup, txqs, 1);
1895                 if (!ndev)
1896                         return -ENOMEM;
1897
1898                 if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len)
1899                         ndev->tx_queue_len = local->hw.wiphy->tx_queue_len;
1900
1901                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1902
1903                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1904                 if (!ndev->tstats) {
1905                         free_netdev(ndev);
1906                         return -ENOMEM;
1907                 }
1908
1909                 ndev->needed_headroom = local->tx_headroom +
1910                                         4*6 /* four MAC addresses */
1911                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1912                                         + 6 /* mesh */
1913                                         + 8 /* rfc1042/bridge tunnel */
1914                                         - ETH_HLEN /* ethernet hard_header_len */
1915                                         + IEEE80211_ENCRYPT_HEADROOM;
1916                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1917
1918                 ret = dev_alloc_name(ndev, ndev->name);
1919                 if (ret < 0) {
1920                         ieee80211_if_free(ndev);
1921                         free_netdev(ndev);
1922                         return ret;
1923                 }
1924
1925                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1926                 if (is_valid_ether_addr(params->macaddr))
1927                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1928                 else
1929                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1930                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1931
1932                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1933                 sdata = netdev_priv(ndev);
1934                 ndev->ieee80211_ptr = &sdata->wdev;
1935                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1936                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1937
1938                 if (txq_size) {
1939                         txqi = netdev_priv(ndev) + size;
1940                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1941                 }
1942
1943                 sdata->dev = ndev;
1944         }
1945
1946         /* initialise type-independent data */
1947         sdata->wdev.wiphy = local->hw.wiphy;
1948         sdata->local = local;
1949
1950         ieee80211_init_frag_cache(&sdata->frags);
1951
1952         INIT_LIST_HEAD(&sdata->key_list);
1953
1954         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1955                           ieee80211_dfs_cac_timer_work);
1956         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1957                           ieee80211_delayed_tailroom_dec);
1958
1959         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1960                 struct ieee80211_supported_band *sband;
1961                 sband = local->hw.wiphy->bands[i];
1962                 sdata->rc_rateidx_mask[i] =
1963                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1964                 if (sband) {
1965                         __le16 cap;
1966                         u16 *vht_rate_mask;
1967
1968                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1969                                sband->ht_cap.mcs.rx_mask,
1970                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1971
1972                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1973                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1974                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1975                 } else {
1976                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1977                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1978                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1979                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1980                 }
1981         }
1982
1983         ieee80211_set_default_queues(sdata);
1984
1985         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1986         sdata->user_power_level = local->user_power_level;
1987
1988         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1989
1990         /* setup type-dependent data */
1991         ieee80211_setup_sdata(sdata, type);
1992
1993         if (ndev) {
1994                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1995                 if (type == NL80211_IFTYPE_STATION)
1996                         sdata->u.mgd.use_4addr = params->use_4addr;
1997
1998                 ndev->features |= local->hw.netdev_features;
1999                 ndev->hw_features |= ndev->features &
2000                                         MAC80211_SUPPORTED_FEATURES_TX;
2001
2002                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
2003
2004                 /* MTU range is normally 256 - 2304, where the upper limit is
2005                  * the maximum MSDU size. Monitor interfaces send and receive
2006                  * MPDU and A-MSDU frames which may be much larger so we do
2007                  * not impose an upper limit in that case.
2008                  */
2009                 ndev->min_mtu = 256;
2010                 if (type == NL80211_IFTYPE_MONITOR)
2011                         ndev->max_mtu = 0;
2012                 else
2013                         ndev->max_mtu = local->hw.max_mtu;
2014
2015                 ret = register_netdevice(ndev);
2016                 if (ret) {
2017                         free_netdev(ndev);
2018                         return ret;
2019                 }
2020         }
2021
2022         mutex_lock(&local->iflist_mtx);
2023         list_add_tail_rcu(&sdata->list, &local->interfaces);
2024         mutex_unlock(&local->iflist_mtx);
2025
2026         if (new_wdev)
2027                 *new_wdev = &sdata->wdev;
2028
2029         return 0;
2030 }
2031
2032 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2033 {
2034         ASSERT_RTNL();
2035
2036         mutex_lock(&sdata->local->iflist_mtx);
2037         list_del_rcu(&sdata->list);
2038         mutex_unlock(&sdata->local->iflist_mtx);
2039
2040         if (sdata->vif.txq)
2041                 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2042
2043         synchronize_rcu();
2044
2045         if (sdata->dev) {
2046                 unregister_netdevice(sdata->dev);
2047         } else {
2048                 cfg80211_unregister_wdev(&sdata->wdev);
2049                 ieee80211_teardown_sdata(sdata);
2050                 kfree(sdata);
2051         }
2052 }
2053
2054 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2055 {
2056         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2057                 return;
2058         ieee80211_do_stop(sdata, true);
2059 }
2060
2061 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2062 {
2063         struct ieee80211_sub_if_data *sdata, *tmp;
2064         LIST_HEAD(unreg_list);
2065         LIST_HEAD(wdev_list);
2066
2067         ASSERT_RTNL();
2068
2069         /* Before destroying the interfaces, make sure they're all stopped so
2070          * that the hardware is stopped. Otherwise, the driver might still be
2071          * iterating the interfaces during the shutdown, e.g. from a worker
2072          * or from RX processing or similar, and if it does so (using atomic
2073          * iteration) while we're manipulating the list, the iteration will
2074          * crash.
2075          *
2076          * After this, the hardware should be stopped and the driver should
2077          * have stopped all of its activities, so that we can do RCU-unaware
2078          * manipulations of the interface list below.
2079          */
2080         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2081
2082         WARN(local->open_count, "%s: open count remains %d\n",
2083              wiphy_name(local->hw.wiphy), local->open_count);
2084
2085         ieee80211_txq_teardown_flows(local);
2086
2087         mutex_lock(&local->iflist_mtx);
2088         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
2089                 list_del(&sdata->list);
2090
2091                 if (sdata->dev)
2092                         unregister_netdevice_queue(sdata->dev, &unreg_list);
2093                 else
2094                         list_add(&sdata->list, &wdev_list);
2095         }
2096         mutex_unlock(&local->iflist_mtx);
2097         unregister_netdevice_many(&unreg_list);
2098
2099         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2100                 list_del(&sdata->list);
2101                 cfg80211_unregister_wdev(&sdata->wdev);
2102                 kfree(sdata);
2103         }
2104 }
2105
2106 static int netdev_notify(struct notifier_block *nb,
2107                          unsigned long state, void *ptr)
2108 {
2109         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2110         struct ieee80211_sub_if_data *sdata;
2111
2112         if (state != NETDEV_CHANGENAME)
2113                 return NOTIFY_DONE;
2114
2115         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2116                 return NOTIFY_DONE;
2117
2118         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2119                 return NOTIFY_DONE;
2120
2121         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2122         memcpy(sdata->name, dev->name, IFNAMSIZ);
2123         ieee80211_debugfs_rename_netdev(sdata);
2124
2125         return NOTIFY_OK;
2126 }
2127
2128 static struct notifier_block mac80211_netdev_notifier = {
2129         .notifier_call = netdev_notify,
2130 };
2131
2132 int ieee80211_iface_init(void)
2133 {
2134         return register_netdevice_notifier(&mac80211_netdev_notifier);
2135 }
2136
2137 void ieee80211_iface_exit(void)
2138 {
2139         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2140 }
2141
2142 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2143 {
2144         if (sdata->vif.type == NL80211_IFTYPE_AP)
2145                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2146         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2147                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2148 }
2149
2150 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2151 {
2152         if (sdata->vif.type == NL80211_IFTYPE_AP)
2153                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2154         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2155                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2156 }