net/mac80211/iface.c

   1 /*
   2  * Interface handling
   3  *
   4  * Copyright 2002-2005, Instant802 Networks, Inc.
   5  * Copyright 2005-2006, Devicescape Software, Inc.
   6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   8  * Copyright 2013-2014  Intel Mobile Communications GmbH
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14 #include <linux/slab.h>
  15 #include <linux/kernel.h>
  16 #include <linux/if_arp.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/rtnetlink.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_change_mtu(struct net_device *dev, int new_mtu)
 154 {
 155         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
 156                 return -EINVAL;
 157
 158         dev->mtu = new_mtu;
 159         return 0;
 160 }
 161
 162 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 163                                 bool check_dup)
 164 {
 165         struct ieee80211_local *local = sdata->local;
 166         struct ieee80211_sub_if_data *iter;
 167         u64 new, mask, tmp;
 168         u8 *m;
 169         int ret = 0;
 170
 171         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 172                 return 0;
 173
 174         m = addr;
 175         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 176                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 177                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 178
 179         m = local->hw.wiphy->addr_mask;
 180         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 181                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 182                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 183
 184         if (!check_dup)
 185                 return ret;
 186
 187         mutex_lock(&local->iflist_mtx);
 188         list_for_each_entry(iter, &local->interfaces, list) {
 189                 if (iter == sdata)
 190                         continue;
 191
 192                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 193                     !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 194                         continue;
 195
 196                 m = iter->vif.addr;
 197                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 198                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 199                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 200
 201                 if ((new & ~mask) != (tmp & ~mask)) {
 202                         ret = -EINVAL;
 203                         break;
 204                 }
 205         }
 206         mutex_unlock(&local->iflist_mtx);
 207
 208         return ret;
 209 }
 210
 211 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 212 {
 213         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 214         struct sockaddr *sa = addr;
 215         bool check_dup = true;
 216         int ret;
 217
 218         if (ieee80211_sdata_running(sdata))
 219                 return -EBUSY;
 220
 221         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 222             !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 223                 check_dup = false;
 224
 225         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 226         if (ret)
 227                 return ret;
 228
 229         ret = eth_mac_addr(dev, sa);
 230
 231         if (ret == 0)
 232                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 233
 234         return ret;
 235 }
 236
 237 static inline int identical_mac_addr_allowed(int type1, int type2)
 238 {
 239         return type1 == NL80211_IFTYPE_MONITOR ||
 240                 type2 == NL80211_IFTYPE_MONITOR ||
 241                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 242                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 243                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 244                 (type1 == NL80211_IFTYPE_WDS &&
 245                         (type2 == NL80211_IFTYPE_WDS ||
 246                          type2 == NL80211_IFTYPE_AP)) ||
 247                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 248                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 249                         (type2 == NL80211_IFTYPE_AP ||
 250                          type2 == NL80211_IFTYPE_AP_VLAN));
 251 }
 252
 253 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 254                                             enum nl80211_iftype iftype)
 255 {
 256         struct ieee80211_local *local = sdata->local;
 257         struct ieee80211_sub_if_data *nsdata;
 258         int ret;
 259
 260         ASSERT_RTNL();
 261
 262         /* we hold the RTNL here so can safely walk the list */
 263         list_for_each_entry(nsdata, &local->interfaces, list) {
 264                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 265                         /*
 266                          * Only OCB and monitor mode may coexist
 267                          */
 268                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
 269                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
 270                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 271                              nsdata->vif.type == NL80211_IFTYPE_OCB))
 272                                 return -EBUSY;
 273
 274                         /*
 275                          * Allow only a single IBSS interface to be up at any
 276                          * time. This is restricted because beacon distribution
 277                          * cannot work properly if both are in the same IBSS.
 278                          *
 279                          * To remove this restriction we'd have to disallow them
 280                          * from setting the same SSID on different IBSS interfaces
 281                          * belonging to the same hardware. Then, however, we're
 282                          * faced with having to adopt two different TSF timers...
 283                          */
 284                         if (iftype == NL80211_IFTYPE_ADHOC &&
 285                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 286                                 return -EBUSY;
 287                         /*
 288                          * will not add another interface while any channel
 289                          * switch is active.
 290                          */
 291                         if (nsdata->vif.csa_active)
 292                                 return -EBUSY;
 293
 294                         /*
 295                          * The remaining checks are only performed for interfaces
 296                          * with the same MAC address.
 297                          */
 298                         if (!ether_addr_equal(sdata->vif.addr,
 299                                               nsdata->vif.addr))
 300                                 continue;
 301
 302                         /*
 303                          * check whether it may have the same address
 304                          */
 305                         if (!identical_mac_addr_allowed(iftype,
 306                                                         nsdata->vif.type))
 307                                 return -ENOTUNIQ;
 308
 309                         /*
 310                          * can only add VLANs to enabled APs
 311                          */
 312                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 313                             nsdata->vif.type == NL80211_IFTYPE_AP)
 314                                 sdata->bss = &nsdata->u.ap;
 315                 }
 316         }
 317
 318         mutex_lock(&local->chanctx_mtx);
 319         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
 320         mutex_unlock(&local->chanctx_mtx);
 321         return ret;
 322 }
 323
 324 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 325                                   enum nl80211_iftype iftype)
 326 {
 327         int n_queues = sdata->local->hw.queues;
 328         int i;
 329
 330         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 331                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 332                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 333                                          IEEE80211_INVAL_HW_QUEUE))
 334                                 return -EINVAL;
 335                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 336                                          n_queues))
 337                                 return -EINVAL;
 338                 }
 339         }
 340
 341         if ((iftype != NL80211_IFTYPE_AP &&
 342              iftype != NL80211_IFTYPE_P2P_GO &&
 343              iftype != NL80211_IFTYPE_MESH_POINT) ||
 344             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
 345                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 346                 return 0;
 347         }
 348
 349         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 350                 return -EINVAL;
 351
 352         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 353                 return -EINVAL;
 354
 355         return 0;
 356 }
 357
 358 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 359                                     const int offset)
 360 {
 361         struct ieee80211_local *local = sdata->local;
 362         u32 flags = sdata->u.mntr.flags;
 363
 364 #define ADJUST(_f, _s)  do {                                    \
 365         if (flags & MONITOR_FLAG_##_f)                          \
 366                 local->fif_##_s += offset;                      \
 367         } while (0)
 368
 369         ADJUST(FCSFAIL, fcsfail);
 370         ADJUST(PLCPFAIL, plcpfail);
 371         ADJUST(CONTROL, control);
 372         ADJUST(CONTROL, pspoll);
 373         ADJUST(OTHER_BSS, other_bss);
 374
 375 #undef ADJUST
 376 }
 377
 378 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 379 {
 380         struct ieee80211_local *local = sdata->local;
 381         int i;
 382
 383         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 384                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
 385                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 386                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 387                         sdata->vif.hw_queue[i] = i;
 388                 else
 389                         sdata->vif.hw_queue[i] = 0;
 390         }
 391         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 392 }
 393
 394 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 395 {
 396         struct ieee80211_sub_if_data *sdata;
 397         int ret;
 398
 399         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 400                 return 0;
 401
 402         ASSERT_RTNL();
 403
 404         if (local->monitor_sdata)
 405                 return 0;
 406
 407         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 408         if (!sdata)
 409                 return -ENOMEM;
 410
 411         /* set up data */
 412         sdata->local = local;
 413         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 414         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 415                  wiphy_name(local->hw.wiphy));
 416         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
 417
 418         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 419
 420         ieee80211_set_default_queues(sdata);
 421
 422         ret = drv_add_interface(local, sdata);
 423         if (WARN_ON(ret)) {
 424                 /* ok .. stupid driver, it asked for this! */
 425                 kfree(sdata);
 426                 return ret;
 427         }
 428
 429         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 430         if (ret) {
 431                 kfree(sdata);
 432                 return ret;
 433         }
 434
 435         mutex_lock(&local->iflist_mtx);
 436         rcu_assign_pointer(local->monitor_sdata, sdata);
 437         mutex_unlock(&local->iflist_mtx);
 438
 439         mutex_lock(&local->mtx);
 440         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 441                                         IEEE80211_CHANCTX_EXCLUSIVE);
 442         mutex_unlock(&local->mtx);
 443         if (ret) {
 444                 mutex_lock(&local->iflist_mtx);
 445                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
 446                 mutex_unlock(&local->iflist_mtx);
 447                 synchronize_net();
 448                 drv_remove_interface(local, sdata);
 449                 kfree(sdata);
 450                 return ret;
 451         }
 452
 453         skb_queue_head_init(&sdata->skb_queue);
 454         INIT_WORK(&sdata->work, ieee80211_iface_work);
 455
 456         return 0;
 457 }
 458
 459 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 460 {
 461         struct ieee80211_sub_if_data *sdata;
 462
 463         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 464                 return;
 465
 466         ASSERT_RTNL();
 467
 468         mutex_lock(&local->iflist_mtx);
 469
 470         sdata = rcu_dereference_protected(local->monitor_sdata,
 471                                           lockdep_is_held(&local->iflist_mtx));
 472         if (!sdata) {
 473                 mutex_unlock(&local->iflist_mtx);
 474                 return;
 475         }
 476
 477         RCU_INIT_POINTER(local->monitor_sdata, NULL);
 478         mutex_unlock(&local->iflist_mtx);
 479
 480         synchronize_net();
 481
 482         mutex_lock(&local->mtx);
 483         ieee80211_vif_release_channel(sdata);
 484         mutex_unlock(&local->mtx);
 485
 486         drv_remove_interface(local, sdata);
 487
 488         kfree(sdata);
 489 }
 490
 491 /*
 492  * NOTE: Be very careful when changing this function, it must NOT return
 493  * an error on interface type changes that have been pre-checked, so most
 494  * checks should be in ieee80211_check_concurrent_iface.
 495  */
 496 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 497 {
 498         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 499         struct net_device *dev = wdev->netdev;
 500         struct ieee80211_local *local = sdata->local;
 501         struct sta_info *sta;
 502         u32 changed = 0;
 503         int res;
 504         u32 hw_reconf_flags = 0;
 505
 506         switch (sdata->vif.type) {
 507         case NL80211_IFTYPE_WDS:
 508                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 509                         return -ENOLINK;
 510                 break;
 511         case NL80211_IFTYPE_AP_VLAN: {
 512                 struct ieee80211_sub_if_data *master;
 513
 514                 if (!sdata->bss)
 515                         return -ENOLINK;
 516
 517                 mutex_lock(&local->mtx);
 518                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 519                 mutex_unlock(&local->mtx);
 520
 521                 master = container_of(sdata->bss,
 522                                       struct ieee80211_sub_if_data, u.ap);
 523                 sdata->control_port_protocol =
 524                         master->control_port_protocol;
 525                 sdata->control_port_no_encrypt =
 526                         master->control_port_no_encrypt;
 527                 sdata->vif.cab_queue = master->vif.cab_queue;
 528                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
 529                        sizeof(sdata->vif.hw_queue));
 530                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
 531
 532                 mutex_lock(&local->key_mtx);
 533                 sdata->crypto_tx_tailroom_needed_cnt +=
 534                         master->crypto_tx_tailroom_needed_cnt;
 535                 mutex_unlock(&local->key_mtx);
 536
 537                 break;
 538                 }
 539         case NL80211_IFTYPE_AP:
 540                 sdata->bss = &sdata->u.ap;
 541                 break;
 542         case NL80211_IFTYPE_MESH_POINT:
 543         case NL80211_IFTYPE_STATION:
 544         case NL80211_IFTYPE_MONITOR:
 545         case NL80211_IFTYPE_ADHOC:
 546         case NL80211_IFTYPE_P2P_DEVICE:
 547         case NL80211_IFTYPE_OCB:
 548                 /* no special treatment */
 549                 break;
 550         case NL80211_IFTYPE_UNSPECIFIED:
 551         case NUM_NL80211_IFTYPES:
 552         case NL80211_IFTYPE_P2P_CLIENT:
 553         case NL80211_IFTYPE_P2P_GO:
 554                 /* cannot happen */
 555                 WARN_ON(1);
 556                 break;
 557         }
 558
 559         if (local->open_count == 0) {
 560                 res = drv_start(local);
 561                 if (res)
 562                         goto err_del_bss;
 563                 /* we're brought up, everything changes */
 564                 hw_reconf_flags = ~0;
 565                 ieee80211_led_radio(local, true);
 566                 ieee80211_mod_tpt_led_trig(local,
 567                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 568         }
 569
 570         /*
 571          * Copy the hopefully now-present MAC address to
 572          * this interface, if it has the special null one.
 573          */
 574         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 575                 memcpy(dev->dev_addr,
 576                        local->hw.wiphy->perm_addr,
 577                        ETH_ALEN);
 578                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 579
 580                 if (!is_valid_ether_addr(dev->dev_addr)) {
 581                         res = -EADDRNOTAVAIL;
 582                         goto err_stop;
 583                 }
 584         }
 585
 586         switch (sdata->vif.type) {
 587         case NL80211_IFTYPE_AP_VLAN:
 588                 /* no need to tell driver, but set carrier and chanctx */
 589                 if (rtnl_dereference(sdata->bss->beacon)) {
 590                         ieee80211_vif_vlan_copy_chanctx(sdata);
 591                         netif_carrier_on(dev);
 592                 } else {
 593                         netif_carrier_off(dev);
 594                 }
 595                 break;
 596         case NL80211_IFTYPE_MONITOR:
 597                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 598                         local->cooked_mntrs++;
 599                         break;
 600                 }
 601
 602                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
 603                         res = drv_add_interface(local, sdata);
 604                         if (res)
 605                                 goto err_stop;
 606                 } else if (local->monitors == 0 && local->open_count == 0) {
 607                         res = ieee80211_add_virtual_monitor(local);
 608                         if (res)
 609                                 goto err_stop;
 610                 }
 611
 612                 /* must be before the call to ieee80211_configure_filter */
 613                 local->monitors++;
 614                 if (local->monitors == 1) {
 615                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 616                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 617                 }
 618
 619                 ieee80211_adjust_monitor_flags(sdata, 1);
 620                 ieee80211_configure_filter(local);
 621                 mutex_lock(&local->mtx);
 622                 ieee80211_recalc_idle(local);
 623                 mutex_unlock(&local->mtx);
 624
 625                 netif_carrier_on(dev);
 626                 break;
 627         default:
 628                 if (coming_up) {
 629                         ieee80211_del_virtual_monitor(local);
 630
 631                         res = drv_add_interface(local, sdata);
 632                         if (res)
 633                                 goto err_stop;
 634                         res = ieee80211_check_queues(sdata,
 635                                 ieee80211_vif_type_p2p(&sdata->vif));
 636                         if (res)
 637                                 goto err_del_interface;
 638                 }
 639
 640                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 641                         local->fif_pspoll++;
 642                         local->fif_probe_req++;
 643
 644                         ieee80211_configure_filter(local);
 645                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 646                         local->fif_probe_req++;
 647                 }
 648
 649                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 650                         changed |= ieee80211_reset_erp_info(sdata);
 651                 ieee80211_bss_info_change_notify(sdata, changed);
 652
 653                 switch (sdata->vif.type) {
 654                 case NL80211_IFTYPE_STATION:
 655                 case NL80211_IFTYPE_ADHOC:
 656                 case NL80211_IFTYPE_AP:
 657                 case NL80211_IFTYPE_MESH_POINT:
 658                 case NL80211_IFTYPE_OCB:
 659                         netif_carrier_off(dev);
 660                         break;
 661                 case NL80211_IFTYPE_WDS:
 662                 case NL80211_IFTYPE_P2P_DEVICE:
 663                         break;
 664                 default:
 665                         /* not reached */
 666                         WARN_ON(1);
 667                 }
 668
 669                 /*
 670                  * Set default queue parameters so drivers don't
 671                  * need to initialise the hardware if the hardware
 672                  * doesn't start up with sane defaults.
 673                  * Enable QoS for anything but station interfaces.
 674                  */
 675                 ieee80211_set_wmm_default(sdata, true,
 676                         sdata->vif.type != NL80211_IFTYPE_STATION);
 677         }
 678
 679         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 680
 681         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 682                 /* Create STA entry for the WDS peer */
 683                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 684                                      GFP_KERNEL);
 685                 if (!sta) {
 686                         res = -ENOMEM;
 687                         goto err_del_interface;
 688                 }
 689
 690                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 691                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 692                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 693
 694                 res = sta_info_insert(sta);
 695                 if (res) {
 696                         /* STA has been freed */
 697                         goto err_del_interface;
 698                 }
 699
 700                 rate_control_rate_init(sta);
 701                 netif_carrier_on(dev);
 702         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 703                 rcu_assign_pointer(local->p2p_sdata, sdata);
 704         }
 705
 706         /*
 707          * set_multicast_list will be invoked by the networking core
 708          * which will check whether any increments here were done in
 709          * error and sync them down to the hardware as filter flags.
 710          */
 711         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 712                 atomic_inc(&local->iff_allmultis);
 713
 714         if (coming_up)
 715                 local->open_count++;
 716
 717         if (hw_reconf_flags)
 718                 ieee80211_hw_config(local, hw_reconf_flags);
 719
 720         ieee80211_recalc_ps(local);
 721
 722         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 723             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 724                 /* XXX: for AP_VLAN, actually track AP queues */
 725                 netif_tx_start_all_queues(dev);
 726         } else if (dev) {
 727                 unsigned long flags;
 728                 int n_acs = IEEE80211_NUM_ACS;
 729                 int ac;
 730
 731                 if (local->hw.queues < IEEE80211_NUM_ACS)
 732                         n_acs = 1;
 733
 734                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 735                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 736                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 737                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 738                         for (ac = 0; ac < n_acs; ac++) {
 739                                 int ac_queue = sdata->vif.hw_queue[ac];
 740
 741                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 742                                     skb_queue_empty(&local->pending[ac_queue]))
 743                                         netif_start_subqueue(dev, ac);
 744                         }
 745                 }
 746                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 747         }
 748
 749         return 0;
 750  err_del_interface:
 751         drv_remove_interface(local, sdata);
 752  err_stop:
 753         if (!local->open_count)
 754                 drv_stop(local);
 755  err_del_bss:
 756         sdata->bss = NULL;
 757         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 758                 mutex_lock(&local->mtx);
 759                 list_del(&sdata->u.vlan.list);
 760                 mutex_unlock(&local->mtx);
 761         }
 762         /* might already be clear but that doesn't matter */
 763         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 764         return res;
 765 }
 766
 767 static int ieee80211_open(struct net_device *dev)
 768 {
 769         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 770         int err;
 771
 772         /* fail early if user set an invalid address */
 773         if (!is_valid_ether_addr(dev->dev_addr))
 774                 return -EADDRNOTAVAIL;
 775
 776         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 777         if (err)
 778                 return err;
 779
 780         return ieee80211_do_open(&sdata->wdev, true);
 781 }
 782
 783 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 784                               bool going_down)
 785 {
 786         struct ieee80211_local *local = sdata->local;
 787         struct fq *fq = &local->fq;
 788         unsigned long flags;
 789         struct sk_buff *skb, *tmp;
 790         u32 hw_reconf_flags = 0;
 791         int i, flushed;
 792         struct ps_data *ps;
 793         struct cfg80211_chan_def chandef;
 794         bool cancel_scan;
 795
 796         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 797
 798         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 799         if (cancel_scan)
 800                 ieee80211_scan_cancel(local);
 801
 802         /*
 803          * Stop TX on this interface first.
 804          */
 805         if (sdata->dev)
 806                 netif_tx_stop_all_queues(sdata->dev);
 807
 808         ieee80211_roc_purge(local, sdata);
 809
 810         switch (sdata->vif.type) {
 811         case NL80211_IFTYPE_STATION:
 812                 ieee80211_mgd_stop(sdata);
 813                 break;
 814         case NL80211_IFTYPE_ADHOC:
 815                 ieee80211_ibss_stop(sdata);
 816                 break;
 817         case NL80211_IFTYPE_AP:
 818                 cancel_work_sync(&sdata->u.ap.request_smps_work);
 819                 break;
 820         default:
 821                 break;
 822         }
 823
 824         /*
 825          * Remove all stations associated with this interface.
 826          *
 827          * This must be done before calling ops->remove_interface()
 828          * because otherwise we can later invoke ops->sta_notify()
 829          * whenever the STAs are removed, and that invalidates driver
 830          * assumptions about always getting a vif pointer that is valid
 831          * (because if we remove a STA after ops->remove_interface()
 832          * the driver will have removed the vif info already!)
 833          *
 834          * In WDS mode a station must exist here and be flushed, for
 835          * AP_VLANs stations may exist since there's nothing else that
 836          * would have removed them, but in other modes there shouldn't
 837          * be any stations.
 838          */
 839         flushed = sta_info_flush(sdata);
 840         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
 841                      ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 842                       (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
 843
 844         /* don't count this interface for allmulti while it is down */
 845         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 846                 atomic_dec(&local->iff_allmultis);
 847
 848         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 849                 local->fif_pspoll--;
 850                 local->fif_probe_req--;
 851         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 852                 local->fif_probe_req--;
 853         }
 854
 855         if (sdata->dev) {
 856                 netif_addr_lock_bh(sdata->dev);
 857                 spin_lock_bh(&local->filter_lock);
 858                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 859                                  sdata->dev->addr_len);
 860                 spin_unlock_bh(&local->filter_lock);
 861                 netif_addr_unlock_bh(sdata->dev);
 862         }
 863
 864         del_timer_sync(&local->dynamic_ps_timer);
 865         cancel_work_sync(&local->dynamic_ps_enable_work);
 866
 867         cancel_work_sync(&sdata->recalc_smps);
 868         sdata_lock(sdata);
 869         mutex_lock(&local->mtx);
 870         sdata->vif.csa_active = false;
 871         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 872                 sdata->u.mgd.csa_waiting_bcn = false;
 873         if (sdata->csa_block_tx) {
 874                 ieee80211_wake_vif_queues(local, sdata,
 875                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 876                 sdata->csa_block_tx = false;
 877         }
 878         mutex_unlock(&local->mtx);
 879         sdata_unlock(sdata);
 880
 881         cancel_work_sync(&sdata->csa_finalize_work);
 882
 883         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 884
 885         if (sdata->wdev.cac_started) {
 886                 chandef = sdata->vif.bss_conf.chandef;
 887                 WARN_ON(local->suspended);
 888                 mutex_lock(&local->mtx);
 889                 ieee80211_vif_release_channel(sdata);
 890                 mutex_unlock(&local->mtx);
 891                 cfg80211_cac_event(sdata->dev, &chandef,
 892                                    NL80211_RADAR_CAC_ABORTED,
 893                                    GFP_KERNEL);
 894         }
 895
 896         /* APs need special treatment */
 897         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 898                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 899
 900                 /* down all dependent devices, that is VLANs */
 901                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 902                                          u.vlan.list)
 903                         dev_close(vlan->dev);
 904                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 905         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 906                 /* remove all packets in parent bc_buf pointing to this dev */
 907                 ps = &sdata->bss->ps;
 908
 909                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 910                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 911                         if (skb->dev == sdata->dev) {
 912                                 __skb_unlink(skb, &ps->bc_buf);
 913                                 local->total_ps_buffered--;
 914                                 ieee80211_free_txskb(&local->hw, skb);
 915                         }
 916                 }
 917                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 918         }
 919
 920         if (going_down)
 921                 local->open_count--;
 922
 923         switch (sdata->vif.type) {
 924         case NL80211_IFTYPE_AP_VLAN:
 925                 mutex_lock(&local->mtx);
 926                 list_del(&sdata->u.vlan.list);
 927                 mutex_unlock(&local->mtx);
 928                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 929                 /* see comment in the default case below */
 930                 ieee80211_free_keys(sdata, true);
 931                 /* no need to tell driver */
 932                 break;
 933         case NL80211_IFTYPE_MONITOR:
 934                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 935                         local->cooked_mntrs--;
 936                         break;
 937                 }
 938
 939                 local->monitors--;
 940                 if (local->monitors == 0) {
 941                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 942                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 943                 }
 944
 945                 ieee80211_adjust_monitor_flags(sdata, -1);
 946                 break;
 947         case NL80211_IFTYPE_P2P_DEVICE:
 948                 /* relies on synchronize_rcu() below */
 949                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 950                 /* fall through */
 951         default:
 952                 cancel_work_sync(&sdata->work);
 953                 /*
 954                  * When we get here, the interface is marked down.
 955                  * Free the remaining keys, if there are any
 956                  * (which can happen in AP mode if userspace sets
 957                  * keys before the interface is operating, and maybe
 958                  * also in WDS mode)
 959                  *
 960                  * Force the key freeing to always synchronize_net()
 961                  * to wait for the RX path in case it is using this
 962                  * interface enqueuing frames at this very time on
 963                  * another CPU.
 964                  */
 965                 ieee80211_free_keys(sdata, true);
 966                 skb_queue_purge(&sdata->skb_queue);
 967         }
 968
 969         sdata->bss = NULL;
 970
 971         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 972         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 973                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 974                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 975                         if (info->control.vif == &sdata->vif) {
 976                                 __skb_unlink(skb, &local->pending[i]);
 977                                 ieee80211_free_txskb(&local->hw, skb);
 978                         }
 979                 }
 980         }
 981         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 982
 983         if (sdata->vif.txq) {
 984                 struct txq_info *txqi = to_txq_info(sdata->vif.txq);
 985
 986                 spin_lock_bh(&fq->lock);
 987                 ieee80211_txq_purge(local, txqi);
 988                 spin_unlock_bh(&fq->lock);
 989         }
 990
 991         if (local->open_count == 0)
 992                 ieee80211_clear_tx_pending(local);
 993
 994         /*
 995          * If the interface goes down while suspended, presumably because
 996          * the device was unplugged and that happens before our resume,
 997          * then the driver is already unconfigured and the remainder of
 998          * this function isn't needed.
 999          * XXX: what about WoWLAN? If the device has software state, e.g.
1000          *      memory allocated, it might expect teardown commands from
1001          *      mac80211 here?
1002          */
1003         if (local->suspended) {
1004                 WARN_ON(local->wowlan);
1005                 WARN_ON(rtnl_dereference(local->monitor_sdata));
1006                 return;
1007         }
1008
1009         switch (sdata->vif.type) {
1010         case NL80211_IFTYPE_AP_VLAN:
1011                 break;
1012         case NL80211_IFTYPE_MONITOR:
1013                 if (local->monitors == 0)
1014                         ieee80211_del_virtual_monitor(local);
1015
1016                 mutex_lock(&local->mtx);
1017                 ieee80211_recalc_idle(local);
1018                 mutex_unlock(&local->mtx);
1019
1020                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1021                         break;
1022
1023                 /* fall through */
1024         default:
1025                 if (going_down)
1026                         drv_remove_interface(local, sdata);
1027         }
1028
1029         ieee80211_recalc_ps(local);
1030
1031         if (cancel_scan)
1032                 flush_delayed_work(&local->scan_work);
1033
1034         if (local->open_count == 0) {
1035                 ieee80211_stop_device(local);
1036
1037                 /* no reconfiguring after stop! */
1038                 return;
1039         }
1040
1041         /* do after stop to avoid reconfiguring when we stop anyway */
1042         ieee80211_configure_filter(local);
1043         ieee80211_hw_config(local, hw_reconf_flags);
1044
1045         if (local->monitors == local->open_count)
1046                 ieee80211_add_virtual_monitor(local);
1047 }
1048
1049 static int ieee80211_stop(struct net_device *dev)
1050 {
1051         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1052
1053         ieee80211_do_stop(sdata, true);
1054
1055         return 0;
1056 }
1057
1058 static void ieee80211_set_multicast_list(struct net_device *dev)
1059 {
1060         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1061         struct ieee80211_local *local = sdata->local;
1062         int allmulti, sdata_allmulti;
1063
1064         allmulti = !!(dev->flags & IFF_ALLMULTI);
1065         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1066
1067         if (allmulti != sdata_allmulti) {
1068                 if (dev->flags & IFF_ALLMULTI)
1069                         atomic_inc(&local->iff_allmultis);
1070                 else
1071                         atomic_dec(&local->iff_allmultis);
1072                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1073         }
1074
1075         spin_lock_bh(&local->filter_lock);
1076         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1077         spin_unlock_bh(&local->filter_lock);
1078         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1079 }
1080
1081 /*
1082  * Called when the netdev is removed or, by the code below, before
1083  * the interface type changes.
1084  */
1085 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1086 {
1087         int i;
1088
1089         /* free extra data */
1090         ieee80211_free_keys(sdata, false);
1091
1092         ieee80211_debugfs_remove_netdev(sdata);
1093
1094         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1095                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1096         sdata->fragment_next = 0;
1097
1098         if (ieee80211_vif_is_mesh(&sdata->vif))
1099                 ieee80211_mesh_teardown_sdata(sdata);
1100 }
1101
1102 static void ieee80211_uninit(struct net_device *dev)
1103 {
1104         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1105 }
1106
1107 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1108                                          struct sk_buff *skb,
1109                                          void *accel_priv,
1110                                          select_queue_fallback_t fallback)
1111 {
1112         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1113 }
1114
1115 static struct rtnl_link_stats64 *
1116 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1117 {
1118         int i;
1119
1120         for_each_possible_cpu(i) {
1121                 const struct pcpu_sw_netstats *tstats;
1122                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1123                 unsigned int start;
1124
1125                 tstats = per_cpu_ptr(dev->tstats, i);
1126
1127                 do {
1128                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
1129                         rx_packets = tstats->rx_packets;
1130                         tx_packets = tstats->tx_packets;
1131                         rx_bytes = tstats->rx_bytes;
1132                         tx_bytes = tstats->tx_bytes;
1133                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1134
1135                 stats->rx_packets += rx_packets;
1136                 stats->tx_packets += tx_packets;
1137                 stats->rx_bytes   += rx_bytes;
1138                 stats->tx_bytes   += tx_bytes;
1139         }
1140
1141         return stats;
1142 }
1143
1144 static const struct net_device_ops ieee80211_dataif_ops = {
1145         .ndo_open               = ieee80211_open,
1146         .ndo_stop               = ieee80211_stop,
1147         .ndo_uninit             = ieee80211_uninit,
1148         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1149         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1150         .ndo_change_mtu         = ieee80211_change_mtu,
1151         .ndo_set_mac_address    = ieee80211_change_mac,
1152         .ndo_select_queue       = ieee80211_netdev_select_queue,
1153         .ndo_get_stats64        = ieee80211_get_stats64,
1154 };
1155
1156 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1157                                           struct sk_buff *skb,
1158                                           void *accel_priv,
1159                                           select_queue_fallback_t fallback)
1160 {
1161         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1162         struct ieee80211_local *local = sdata->local;
1163         struct ieee80211_hdr *hdr;
1164         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1165
1166         if (local->hw.queues < IEEE80211_NUM_ACS)
1167                 return 0;
1168
1169         if (skb->len < 4 ||
1170             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1171                 return 0; /* doesn't matter, frame will be dropped */
1172
1173         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1174
1175         return ieee80211_select_queue_80211(sdata, skb, hdr);
1176 }
1177
1178 static const struct net_device_ops ieee80211_monitorif_ops = {
1179         .ndo_open               = ieee80211_open,
1180         .ndo_stop               = ieee80211_stop,
1181         .ndo_uninit             = ieee80211_uninit,
1182         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1183         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1184         .ndo_change_mtu         = ieee80211_change_mtu,
1185         .ndo_set_mac_address    = ieee80211_change_mac,
1186         .ndo_select_queue       = ieee80211_monitor_select_queue,
1187         .ndo_get_stats64        = ieee80211_get_stats64,
1188 };
1189
1190 static void ieee80211_if_free(struct net_device *dev)
1191 {
1192         free_percpu(dev->tstats);
1193         free_netdev(dev);
1194 }
1195
1196 static void ieee80211_if_setup(struct net_device *dev)
1197 {
1198         ether_setup(dev);
1199         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1200         dev->netdev_ops = &ieee80211_dataif_ops;
1201         dev->destructor = ieee80211_if_free;
1202 }
1203
1204 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1205 {
1206         ieee80211_if_setup(dev);
1207         dev->priv_flags |= IFF_NO_QUEUE;
1208 }
1209
1210 static void ieee80211_iface_work(struct work_struct *work)
1211 {
1212         struct ieee80211_sub_if_data *sdata =
1213                 container_of(work, struct ieee80211_sub_if_data, work);
1214         struct ieee80211_local *local = sdata->local;
1215         struct sk_buff *skb;
1216         struct sta_info *sta;
1217         struct ieee80211_ra_tid *ra_tid;
1218         struct ieee80211_rx_agg *rx_agg;
1219
1220         if (!ieee80211_sdata_running(sdata))
1221                 return;
1222
1223         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1224                 return;
1225
1226         if (!ieee80211_can_run_worker(local))
1227                 return;
1228
1229         /* first process frames */
1230         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1231                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1232
1233                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1234                         ra_tid = (void *)&skb->cb;
1235                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1236                                                  ra_tid->tid);
1237                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1238                         ra_tid = (void *)&skb->cb;
1239                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1240                                                 ra_tid->tid);
1241                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1242                         rx_agg = (void *)&skb->cb;
1243                         mutex_lock(&local->sta_mtx);
1244                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1245                         if (sta)
1246                                 __ieee80211_start_rx_ba_session(sta,
1247                                                 0, 0, 0, 1, rx_agg->tid,
1248                                                 IEEE80211_MAX_AMPDU_BUF,
1249                                                 false, true);
1250                         mutex_unlock(&local->sta_mtx);
1251                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1252                         rx_agg = (void *)&skb->cb;
1253                         mutex_lock(&local->sta_mtx);
1254                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1255                         if (sta)
1256                                 __ieee80211_stop_rx_ba_session(sta,
1257                                                         rx_agg->tid,
1258                                                         WLAN_BACK_RECIPIENT, 0,
1259                                                         false);
1260                         mutex_unlock(&local->sta_mtx);
1261                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1262                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1263                         int len = skb->len;
1264
1265                         mutex_lock(&local->sta_mtx);
1266                         sta = sta_info_get_bss(sdata, mgmt->sa);
1267                         if (sta) {
1268                                 switch (mgmt->u.action.u.addba_req.action_code) {
1269                                 case WLAN_ACTION_ADDBA_REQ:
1270                                         ieee80211_process_addba_request(
1271                                                         local, sta, mgmt, len);
1272                                         break;
1273                                 case WLAN_ACTION_ADDBA_RESP:
1274                                         ieee80211_process_addba_resp(local, sta,
1275                                                                      mgmt, len);
1276                                         break;
1277                                 case WLAN_ACTION_DELBA:
1278                                         ieee80211_process_delba(sdata, sta,
1279                                                                 mgmt, len);
1280                                         break;
1281                                 default:
1282                                         WARN_ON(1);
1283                                         break;
1284                                 }
1285                         }
1286                         mutex_unlock(&local->sta_mtx);
1287                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1288                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1289                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1290                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1291                                 ieee80211_process_mu_groups(sdata, mgmt);
1292                                 break;
1293                         default:
1294                                 WARN_ON(1);
1295                                 break;
1296                         }
1297                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1298                         struct ieee80211_hdr *hdr = (void *)mgmt;
1299                         /*
1300                          * So the frame isn't mgmt, but frame_control
1301                          * is at the right place anyway, of course, so
1302                          * the if statement is correct.
1303                          *
1304                          * Warn if we have other data frame types here,
1305                          * they must not get here.
1306                          */
1307                         WARN_ON(hdr->frame_control &
1308                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1309                         WARN_ON(!(hdr->seq_ctrl &
1310                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1311                         /*
1312                          * This was a fragment of a frame, received while
1313                          * a block-ack session was active. That cannot be
1314                          * right, so terminate the session.
1315                          */
1316                         mutex_lock(&local->sta_mtx);
1317                         sta = sta_info_get_bss(sdata, mgmt->sa);
1318                         if (sta) {
1319                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1320                                                 IEEE80211_QOS_CTL_TID_MASK;
1321
1322                                 __ieee80211_stop_rx_ba_session(
1323                                         sta, tid, WLAN_BACK_RECIPIENT,
1324                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1325                                         true);
1326                         }
1327                         mutex_unlock(&local->sta_mtx);
1328                 } else switch (sdata->vif.type) {
1329                 case NL80211_IFTYPE_STATION:
1330                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1331                         break;
1332                 case NL80211_IFTYPE_ADHOC:
1333                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1334                         break;
1335                 case NL80211_IFTYPE_MESH_POINT:
1336                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1337                                 break;
1338                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1339                         break;
1340                 default:
1341                         WARN(1, "frame for unexpected interface type");
1342                         break;
1343                 }
1344
1345                 kfree_skb(skb);
1346         }
1347
1348         /* then other type-dependent work */
1349         switch (sdata->vif.type) {
1350         case NL80211_IFTYPE_STATION:
1351                 ieee80211_sta_work(sdata);
1352                 break;
1353         case NL80211_IFTYPE_ADHOC:
1354                 ieee80211_ibss_work(sdata);
1355                 break;
1356         case NL80211_IFTYPE_MESH_POINT:
1357                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1358                         break;
1359                 ieee80211_mesh_work(sdata);
1360                 break;
1361         case NL80211_IFTYPE_OCB:
1362                 ieee80211_ocb_work(sdata);
1363                 break;
1364         default:
1365                 break;
1366         }
1367 }
1368
1369 static void ieee80211_recalc_smps_work(struct work_struct *work)
1370 {
1371         struct ieee80211_sub_if_data *sdata =
1372                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1373
1374         ieee80211_recalc_smps(sdata);
1375 }
1376
1377 /*
1378  * Helper function to initialise an interface to a specific type.
1379  */
1380 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1381                                   enum nl80211_iftype type)
1382 {
1383         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1384                                                     0xff, 0xff, 0xff};
1385
1386         /* clear type-dependent union */
1387         memset(&sdata->u, 0, sizeof(sdata->u));
1388
1389         /* and set some type-dependent values */
1390         sdata->vif.type = type;
1391         sdata->vif.p2p = false;
1392         sdata->wdev.iftype = type;
1393
1394         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1395         sdata->control_port_no_encrypt = false;
1396         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1397         sdata->vif.bss_conf.idle = true;
1398
1399         sdata->noack_map = 0;
1400
1401         /* only monitor/p2p-device differ */
1402         if (sdata->dev) {
1403                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1404                 sdata->dev->type = ARPHRD_ETHER;
1405         }
1406
1407         skb_queue_head_init(&sdata->skb_queue);
1408         INIT_WORK(&sdata->work, ieee80211_iface_work);
1409         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1410         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1411         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1412         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1413
1414         switch (type) {
1415         case NL80211_IFTYPE_P2P_GO:
1416                 type = NL80211_IFTYPE_AP;
1417                 sdata->vif.type = type;
1418                 sdata->vif.p2p = true;
1419                 /* fall through */
1420         case NL80211_IFTYPE_AP:
1421                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1422                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1423                 INIT_WORK(&sdata->u.ap.request_smps_work,
1424                           ieee80211_request_smps_ap_work);
1425                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1426                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1427                 break;
1428         case NL80211_IFTYPE_P2P_CLIENT:
1429                 type = NL80211_IFTYPE_STATION;
1430                 sdata->vif.type = type;
1431                 sdata->vif.p2p = true;
1432                 /* fall through */
1433         case NL80211_IFTYPE_STATION:
1434                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1435                 ieee80211_sta_setup_sdata(sdata);
1436                 break;
1437         case NL80211_IFTYPE_OCB:
1438                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1439                 ieee80211_ocb_setup_sdata(sdata);
1440                 break;
1441         case NL80211_IFTYPE_ADHOC:
1442                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1443                 ieee80211_ibss_setup_sdata(sdata);
1444                 break;
1445         case NL80211_IFTYPE_MESH_POINT:
1446                 if (ieee80211_vif_is_mesh(&sdata->vif))
1447                         ieee80211_mesh_init_sdata(sdata);
1448                 break;
1449         case NL80211_IFTYPE_MONITOR:
1450                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1451                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1452                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1453                                       MONITOR_FLAG_OTHER_BSS;
1454                 break;
1455         case NL80211_IFTYPE_WDS:
1456                 sdata->vif.bss_conf.bssid = NULL;
1457                 break;
1458         case NL80211_IFTYPE_AP_VLAN:
1459         case NL80211_IFTYPE_P2P_DEVICE:
1460                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1461                 break;
1462         case NL80211_IFTYPE_UNSPECIFIED:
1463         case NUM_NL80211_IFTYPES:
1464                 BUG();
1465                 break;
1466         }
1467
1468         ieee80211_debugfs_add_netdev(sdata);
1469 }
1470
1471 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1472                                            enum nl80211_iftype type)
1473 {
1474         struct ieee80211_local *local = sdata->local;
1475         int ret, err;
1476         enum nl80211_iftype internal_type = type;
1477         bool p2p = false;
1478
1479         ASSERT_RTNL();
1480
1481         if (!local->ops->change_interface)
1482                 return -EBUSY;
1483
1484         switch (sdata->vif.type) {
1485         case NL80211_IFTYPE_AP:
1486         case NL80211_IFTYPE_STATION:
1487         case NL80211_IFTYPE_ADHOC:
1488         case NL80211_IFTYPE_OCB:
1489                 /*
1490                  * Could maybe also all others here?
1491                  * Just not sure how that interacts
1492                  * with the RX/config path e.g. for
1493                  * mesh.
1494                  */
1495                 break;
1496         default:
1497                 return -EBUSY;
1498         }
1499
1500         switch (type) {
1501         case NL80211_IFTYPE_AP:
1502         case NL80211_IFTYPE_STATION:
1503         case NL80211_IFTYPE_ADHOC:
1504         case NL80211_IFTYPE_OCB:
1505                 /*
1506                  * Could probably support everything
1507                  * but WDS here (WDS do_open can fail
1508                  * under memory pressure, which this
1509                  * code isn't prepared to handle).
1510                  */
1511                 break;
1512         case NL80211_IFTYPE_P2P_CLIENT:
1513                 p2p = true;
1514                 internal_type = NL80211_IFTYPE_STATION;
1515                 break;
1516         case NL80211_IFTYPE_P2P_GO:
1517                 p2p = true;
1518                 internal_type = NL80211_IFTYPE_AP;
1519                 break;
1520         default:
1521                 return -EBUSY;
1522         }
1523
1524         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1525         if (ret)
1526                 return ret;
1527
1528         ieee80211_do_stop(sdata, false);
1529
1530         ieee80211_teardown_sdata(sdata);
1531
1532         ret = drv_change_interface(local, sdata, internal_type, p2p);
1533         if (ret)
1534                 type = ieee80211_vif_type_p2p(&sdata->vif);
1535
1536         /*
1537          * Ignore return value here, there's not much we can do since
1538          * the driver changed the interface type internally already.
1539          * The warnings will hopefully make driver authors fix it :-)
1540          */
1541         ieee80211_check_queues(sdata, type);
1542
1543         ieee80211_setup_sdata(sdata, type);
1544
1545         err = ieee80211_do_open(&sdata->wdev, false);
1546         WARN(err, "type change: do_open returned %d", err);
1547
1548         return ret;
1549 }
1550
1551 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1552                              enum nl80211_iftype type)
1553 {
1554         int ret;
1555
1556         ASSERT_RTNL();
1557
1558         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1559                 return 0;
1560
1561         if (ieee80211_sdata_running(sdata)) {
1562                 ret = ieee80211_runtime_change_iftype(sdata, type);
1563                 if (ret)
1564                         return ret;
1565         } else {
1566                 /* Purge and reset type-dependent state. */
1567                 ieee80211_teardown_sdata(sdata);
1568                 ieee80211_setup_sdata(sdata, type);
1569         }
1570
1571         /* reset some values that shouldn't be kept across type changes */
1572         if (type == NL80211_IFTYPE_STATION)
1573                 sdata->u.mgd.use_4addr = false;
1574
1575         return 0;
1576 }
1577
1578 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1579                                        u8 *perm_addr, enum nl80211_iftype type)
1580 {
1581         struct ieee80211_sub_if_data *sdata;
1582         u64 mask, start, addr, val, inc;
1583         u8 *m;
1584         u8 tmp_addr[ETH_ALEN];
1585         int i;
1586
1587         /* default ... something at least */
1588         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1589
1590         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1591             local->hw.wiphy->n_addresses <= 1)
1592                 return;
1593
1594         mutex_lock(&local->iflist_mtx);
1595
1596         switch (type) {
1597         case NL80211_IFTYPE_MONITOR:
1598                 /* doesn't matter */
1599                 break;
1600         case NL80211_IFTYPE_WDS:
1601         case NL80211_IFTYPE_AP_VLAN:
1602                 /* match up with an AP interface */
1603                 list_for_each_entry(sdata, &local->interfaces, list) {
1604                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1605                                 continue;
1606                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1607                         break;
1608                 }
1609                 /* keep default if no AP interface present */
1610                 break;
1611         case NL80211_IFTYPE_P2P_CLIENT:
1612         case NL80211_IFTYPE_P2P_GO:
1613                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1614                         list_for_each_entry(sdata, &local->interfaces, list) {
1615                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1616                                         continue;
1617                                 if (!ieee80211_sdata_running(sdata))
1618                                         continue;
1619                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1620                                 goto out_unlock;
1621                         }
1622                 }
1623                 /* otherwise fall through */
1624         default:
1625                 /* assign a new address if possible -- try n_addresses first */
1626                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1627                         bool used = false;
1628
1629                         list_for_each_entry(sdata, &local->interfaces, list) {
1630                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1631                                                      sdata->vif.addr)) {
1632                                         used = true;
1633                                         break;
1634                                 }
1635                         }
1636
1637                         if (!used) {
1638                                 memcpy(perm_addr,
1639                                        local->hw.wiphy->addresses[i].addr,
1640                                        ETH_ALEN);
1641                                 break;
1642                         }
1643                 }
1644
1645                 /* try mask if available */
1646                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1647                         break;
1648
1649                 m = local->hw.wiphy->addr_mask;
1650                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1651                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1652                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1653
1654                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1655                         /* not a contiguous mask ... not handled now! */
1656                         pr_info("not contiguous\n");
1657                         break;
1658                 }
1659
1660                 /*
1661                  * Pick address of existing interface in case user changed
1662                  * MAC address manually, default to perm_addr.
1663                  */
1664                 m = local->hw.wiphy->perm_addr;
1665                 list_for_each_entry(sdata, &local->interfaces, list) {
1666                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1667                                 continue;
1668                         m = sdata->vif.addr;
1669                         break;
1670                 }
1671                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1672                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1673                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1674
1675                 inc = 1ULL<<__ffs64(mask);
1676                 val = (start & mask);
1677                 addr = (start & ~mask) | (val & mask);
1678                 do {
1679                         bool used = false;
1680
1681                         tmp_addr[5] = addr >> 0*8;
1682                         tmp_addr[4] = addr >> 1*8;
1683                         tmp_addr[3] = addr >> 2*8;
1684                         tmp_addr[2] = addr >> 3*8;
1685                         tmp_addr[1] = addr >> 4*8;
1686                         tmp_addr[0] = addr >> 5*8;
1687
1688                         val += inc;
1689
1690                         list_for_each_entry(sdata, &local->interfaces, list) {
1691                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1692                                         used = true;
1693                                         break;
1694                                 }
1695                         }
1696
1697                         if (!used) {
1698                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1699                                 break;
1700                         }
1701                         addr = (start & ~mask) | (val & mask);
1702                 } while (addr != start);
1703
1704                 break;
1705         }
1706
1707  out_unlock:
1708         mutex_unlock(&local->iflist_mtx);
1709 }
1710
1711 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1712                      unsigned char name_assign_type,
1713                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1714                      struct vif_params *params)
1715 {
1716         struct net_device *ndev = NULL;
1717         struct ieee80211_sub_if_data *sdata = NULL;
1718         struct txq_info *txqi;
1719         void (*if_setup)(struct net_device *dev);
1720         int ret, i;
1721         int txqs = 1;
1722
1723         ASSERT_RTNL();
1724
1725         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1726                 struct wireless_dev *wdev;
1727
1728                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1729                                 GFP_KERNEL);
1730                 if (!sdata)
1731                         return -ENOMEM;
1732                 wdev = &sdata->wdev;
1733
1734                 sdata->dev = NULL;
1735                 strlcpy(sdata->name, name, IFNAMSIZ);
1736                 ieee80211_assign_perm_addr(local, wdev->address, type);
1737                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1738         } else {
1739                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1740                                  sizeof(void *));
1741                 int txq_size = 0;
1742
1743                 if (local->ops->wake_tx_queue)
1744                         txq_size += sizeof(struct txq_info) +
1745                                     local->hw.txq_data_size;
1746
1747                 if (local->ops->wake_tx_queue)
1748                         if_setup = ieee80211_if_setup_no_queue;
1749                 else
1750                         if_setup = ieee80211_if_setup;
1751
1752                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1753                         txqs = IEEE80211_NUM_ACS;
1754
1755                 ndev = alloc_netdev_mqs(size + txq_size,
1756                                         name, name_assign_type,
1757                                         if_setup, txqs, 1);
1758                 if (!ndev)
1759                         return -ENOMEM;
1760                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1761
1762                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1763                 if (!ndev->tstats) {
1764                         free_netdev(ndev);
1765                         return -ENOMEM;
1766                 }
1767
1768                 ndev->needed_headroom = local->tx_headroom +
1769                                         4*6 /* four MAC addresses */
1770                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1771                                         + 6 /* mesh */
1772                                         + 8 /* rfc1042/bridge tunnel */
1773                                         - ETH_HLEN /* ethernet hard_header_len */
1774                                         + IEEE80211_ENCRYPT_HEADROOM;
1775                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1776
1777                 ret = dev_alloc_name(ndev, ndev->name);
1778                 if (ret < 0) {
1779                         ieee80211_if_free(ndev);
1780                         return ret;
1781                 }
1782
1783                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1784                 if (params && is_valid_ether_addr(params->macaddr))
1785                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1786                 else
1787                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1788                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1789
1790                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1791                 sdata = netdev_priv(ndev);
1792                 ndev->ieee80211_ptr = &sdata->wdev;
1793                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1794                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1795
1796                 if (txq_size) {
1797                         txqi = netdev_priv(ndev) + size;
1798                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1799                 }
1800
1801                 sdata->dev = ndev;
1802         }
1803
1804         /* initialise type-independent data */
1805         sdata->wdev.wiphy = local->hw.wiphy;
1806         sdata->local = local;
1807
1808         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1809                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1810
1811         INIT_LIST_HEAD(&sdata->key_list);
1812
1813         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1814                           ieee80211_dfs_cac_timer_work);
1815         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1816                           ieee80211_delayed_tailroom_dec);
1817
1818         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1819                 struct ieee80211_supported_band *sband;
1820                 sband = local->hw.wiphy->bands[i];
1821                 sdata->rc_rateidx_mask[i] =
1822                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1823                 if (sband) {
1824                         __le16 cap;
1825                         u16 *vht_rate_mask;
1826
1827                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1828                                sband->ht_cap.mcs.rx_mask,
1829                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1830
1831                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1832                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1833                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1834                 } else {
1835                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1836                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1837                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1838                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1839                 }
1840         }
1841
1842         ieee80211_set_default_queues(sdata);
1843
1844         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1845         sdata->user_power_level = local->user_power_level;
1846
1847         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1848
1849         /* setup type-dependent data */
1850         ieee80211_setup_sdata(sdata, type);
1851
1852         if (ndev) {
1853                 if (params) {
1854                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1855                         if (type == NL80211_IFTYPE_STATION)
1856                                 sdata->u.mgd.use_4addr = params->use_4addr;
1857                 }
1858
1859                 ndev->features |= local->hw.netdev_features;
1860
1861                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1862
1863                 ret = register_netdevice(ndev);
1864                 if (ret) {
1865                         ieee80211_if_free(ndev);
1866                         return ret;
1867                 }
1868         }
1869
1870         mutex_lock(&local->iflist_mtx);
1871         list_add_tail_rcu(&sdata->list, &local->interfaces);
1872         mutex_unlock(&local->iflist_mtx);
1873
1874         if (new_wdev)
1875                 *new_wdev = &sdata->wdev;
1876
1877         return 0;
1878 }
1879
1880 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1881 {
1882         ASSERT_RTNL();
1883
1884         mutex_lock(&sdata->local->iflist_mtx);
1885         list_del_rcu(&sdata->list);
1886         mutex_unlock(&sdata->local->iflist_mtx);
1887
1888         synchronize_rcu();
1889
1890         if (sdata->dev) {
1891                 unregister_netdevice(sdata->dev);
1892         } else {
1893                 cfg80211_unregister_wdev(&sdata->wdev);
1894                 ieee80211_teardown_sdata(sdata);
1895                 kfree(sdata);
1896         }
1897 }
1898
1899 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1900 {
1901         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1902                 return;
1903         ieee80211_do_stop(sdata, true);
1904 }
1905
1906 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1907 {
1908         struct ieee80211_sub_if_data *sdata, *tmp;
1909         LIST_HEAD(unreg_list);
1910         LIST_HEAD(wdev_list);
1911
1912         ASSERT_RTNL();
1913
1914         /* Before destroying the interfaces, make sure they're all stopped so
1915          * that the hardware is stopped. Otherwise, the driver might still be
1916          * iterating the interfaces during the shutdown, e.g. from a worker
1917          * or from RX processing or similar, and if it does so (using atomic
1918          * iteration) while we're manipulating the list, the iteration will
1919          * crash.
1920          *
1921          * After this, the hardware should be stopped and the driver should
1922          * have stopped all of its activities, so that we can do RCU-unaware
1923          * manipulations of the interface list below.
1924          */
1925         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1926
1927         WARN(local->open_count, "%s: open count remains %d\n",
1928              wiphy_name(local->hw.wiphy), local->open_count);
1929
1930         mutex_lock(&local->iflist_mtx);
1931         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1932                 list_del(&sdata->list);
1933
1934                 if (sdata->dev)
1935                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1936                 else
1937                         list_add(&sdata->list, &wdev_list);
1938         }
1939         mutex_unlock(&local->iflist_mtx);
1940         unregister_netdevice_many(&unreg_list);
1941
1942         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1943                 list_del(&sdata->list);
1944                 cfg80211_unregister_wdev(&sdata->wdev);
1945                 kfree(sdata);
1946         }
1947 }
1948
1949 static int netdev_notify(struct notifier_block *nb,
1950                          unsigned long state, void *ptr)
1951 {
1952         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1953         struct ieee80211_sub_if_data *sdata;
1954
1955         if (state != NETDEV_CHANGENAME)
1956                 return NOTIFY_DONE;
1957
1958         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1959                 return NOTIFY_DONE;
1960
1961         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1962                 return NOTIFY_DONE;
1963
1964         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1965         memcpy(sdata->name, dev->name, IFNAMSIZ);
1966         ieee80211_debugfs_rename_netdev(sdata);
1967
1968         return NOTIFY_OK;
1969 }
1970
1971 static struct notifier_block mac80211_netdev_notifier = {
1972         .notifier_call = netdev_notify,
1973 };
1974
1975 int ieee80211_iface_init(void)
1976 {
1977         return register_netdevice_notifier(&mac80211_netdev_notifier);
1978 }
1979
1980 void ieee80211_iface_exit(void)
1981 {
1982         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1983 }