net/mac80211/iface.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Interface handling
   4  *
   5  * Copyright 2002-2005, Instant802 Networks, Inc.
   6  * Copyright 2005-2006, Devicescape Software, Inc.
   7  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   8  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   9  * Copyright 2013-2014  Intel Mobile Communications GmbH
  10  * Copyright (c) 2016        Intel Deutschland GmbH
  11  * Copyright (C) 2018-2020 Intel Corporation
  12  */
  13 #include <linux/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/if_arp.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/rtnetlink.h>
  18 #include <net/mac80211.h>
  19 #include <net/ieee80211_radiotap.h>
  20 #include "ieee80211_i.h"
  21 #include "sta_info.h"
  22 #include "debugfs_netdev.h"
  23 #include "mesh.h"
  24 #include "led.h"
  25 #include "driver-ops.h"
  26 #include "wme.h"
  27 #include "rate.h"
  28
  29 /**
  30  * DOC: Interface list locking
  31  *
  32  * The interface list in each struct ieee80211_local is protected
  33  * three-fold:
  34  *
  35  * (1) modifications may only be done under the RTNL
  36  * (2) modifications and readers are protected against each other by
  37  *     the iflist_mtx.
  38  * (3) modifications are done in an RCU manner so atomic readers
  39  *     can traverse the list in RCU-safe blocks.
  40  *
  41  * As a consequence, reads (traversals) of the list can be protected
  42  * by either the RTNL, the iflist_mtx or RCU.
  43  */
  44
  45 static void ieee80211_iface_work(struct work_struct *work);
  46
  47 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  48 {
  49         struct ieee80211_chanctx_conf *chanctx_conf;
  50         int power;
  51
  52         rcu_read_lock();
  53         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  54         if (!chanctx_conf) {
  55                 rcu_read_unlock();
  56                 return false;
  57         }
  58
  59         power = ieee80211_chandef_max_power(&chanctx_conf->def);
  60         rcu_read_unlock();
  61
  62         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  63                 power = min(power, sdata->user_power_level);
  64
  65         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  66                 power = min(power, sdata->ap_power_level);
  67
  68         if (power != sdata->vif.bss_conf.txpower) {
  69                 sdata->vif.bss_conf.txpower = power;
  70                 ieee80211_hw_config(sdata->local, 0);
  71                 return true;
  72         }
  73
  74         return false;
  75 }
  76
  77 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
  78                               bool update_bss)
  79 {
  80         if (__ieee80211_recalc_txpower(sdata) ||
  81             (update_bss && ieee80211_sdata_running(sdata)))
  82                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  83 }
  84
  85 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
  86 {
  87         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  88                 return 0;
  89
  90         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  91         return IEEE80211_CONF_CHANGE_IDLE;
  92 }
  93
  94 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  95 {
  96         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  97                 return 0;
  98
  99         ieee80211_flush_queues(local, NULL, false);
 100
 101         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 102         return IEEE80211_CONF_CHANGE_IDLE;
 103 }
 104
 105 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
 106                                    bool force_active)
 107 {
 108         bool working, scanning, active;
 109         unsigned int led_trig_start = 0, led_trig_stop = 0;
 110
 111         lockdep_assert_held(&local->mtx);
 112
 113         active = force_active ||
 114                  !list_empty(&local->chanctx_list) ||
 115                  local->monitors;
 116
 117         working = !local->ops->remain_on_channel &&
 118                   !list_empty(&local->roc_list);
 119
 120         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 121                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 122
 123         if (working || scanning)
 124                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 125         else
 126                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 127
 128         if (active)
 129                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 130         else
 131                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 132
 133         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 134
 135         if (working || scanning || active)
 136                 return __ieee80211_idle_off(local);
 137         return __ieee80211_idle_on(local);
 138 }
 139
 140 u32 ieee80211_idle_off(struct ieee80211_local *local)
 141 {
 142         return __ieee80211_recalc_idle(local, true);
 143 }
 144
 145 void ieee80211_recalc_idle(struct ieee80211_local *local)
 146 {
 147         u32 change = __ieee80211_recalc_idle(local, false);
 148         if (change)
 149                 ieee80211_hw_config(local, change);
 150 }
 151
 152 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 153                                 bool check_dup)
 154 {
 155         struct ieee80211_local *local = sdata->local;
 156         struct ieee80211_sub_if_data *iter;
 157         u64 new, mask, tmp;
 158         u8 *m;
 159         int ret = 0;
 160
 161         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 162                 return 0;
 163
 164         m = addr;
 165         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 166                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 167                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 168
 169         m = local->hw.wiphy->addr_mask;
 170         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 171                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 172                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 173
 174         if (!check_dup)
 175                 return ret;
 176
 177         mutex_lock(&local->iflist_mtx);
 178         list_for_each_entry(iter, &local->interfaces, list) {
 179                 if (iter == sdata)
 180                         continue;
 181
 182                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 183                     !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 184                         continue;
 185
 186                 m = iter->vif.addr;
 187                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 188                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 189                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 190
 191                 if ((new & ~mask) != (tmp & ~mask)) {
 192                         ret = -EINVAL;
 193                         break;
 194                 }
 195         }
 196         mutex_unlock(&local->iflist_mtx);
 197
 198         return ret;
 199 }
 200
 201 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 202 {
 203         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 204         struct sockaddr *sa = addr;
 205         bool check_dup = true;
 206         int ret;
 207
 208         if (ieee80211_sdata_running(sdata))
 209                 return -EBUSY;
 210
 211         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 212             !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 213                 check_dup = false;
 214
 215         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 216         if (ret)
 217                 return ret;
 218
 219         ret = eth_mac_addr(dev, sa);
 220
 221         if (ret == 0)
 222                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 223
 224         return ret;
 225 }
 226
 227 static inline int identical_mac_addr_allowed(int type1, int type2)
 228 {
 229         return type1 == NL80211_IFTYPE_MONITOR ||
 230                 type2 == NL80211_IFTYPE_MONITOR ||
 231                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 232                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 233                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 234                 (type1 == NL80211_IFTYPE_WDS &&
 235                         (type2 == NL80211_IFTYPE_WDS ||
 236                          type2 == NL80211_IFTYPE_AP)) ||
 237                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 238                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 239                         (type2 == NL80211_IFTYPE_AP ||
 240                          type2 == NL80211_IFTYPE_AP_VLAN));
 241 }
 242
 243 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 244                                             enum nl80211_iftype iftype)
 245 {
 246         struct ieee80211_local *local = sdata->local;
 247         struct ieee80211_sub_if_data *nsdata;
 248         int ret;
 249
 250         ASSERT_RTNL();
 251
 252         /* we hold the RTNL here so can safely walk the list */
 253         list_for_each_entry(nsdata, &local->interfaces, list) {
 254                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 255                         /*
 256                          * Only OCB and monitor mode may coexist
 257                          */
 258                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
 259                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
 260                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 261                              nsdata->vif.type == NL80211_IFTYPE_OCB))
 262                                 return -EBUSY;
 263
 264                         /*
 265                          * Allow only a single IBSS interface to be up at any
 266                          * time. This is restricted because beacon distribution
 267                          * cannot work properly if both are in the same IBSS.
 268                          *
 269                          * To remove this restriction we'd have to disallow them
 270                          * from setting the same SSID on different IBSS interfaces
 271                          * belonging to the same hardware. Then, however, we're
 272                          * faced with having to adopt two different TSF timers...
 273                          */
 274                         if (iftype == NL80211_IFTYPE_ADHOC &&
 275                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 276                                 return -EBUSY;
 277                         /*
 278                          * will not add another interface while any channel
 279                          * switch is active.
 280                          */
 281                         if (nsdata->vif.csa_active)
 282                                 return -EBUSY;
 283
 284                         /*
 285                          * The remaining checks are only performed for interfaces
 286                          * with the same MAC address.
 287                          */
 288                         if (!ether_addr_equal(sdata->vif.addr,
 289                                               nsdata->vif.addr))
 290                                 continue;
 291
 292                         /*
 293                          * check whether it may have the same address
 294                          */
 295                         if (!identical_mac_addr_allowed(iftype,
 296                                                         nsdata->vif.type))
 297                                 return -ENOTUNIQ;
 298
 299                         /*
 300                          * can only add VLANs to enabled APs
 301                          */
 302                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 303                             nsdata->vif.type == NL80211_IFTYPE_AP)
 304                                 sdata->bss = &nsdata->u.ap;
 305                 }
 306         }
 307
 308         mutex_lock(&local->chanctx_mtx);
 309         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
 310         mutex_unlock(&local->chanctx_mtx);
 311         return ret;
 312 }
 313
 314 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 315                                   enum nl80211_iftype iftype)
 316 {
 317         int n_queues = sdata->local->hw.queues;
 318         int i;
 319
 320         if (iftype == NL80211_IFTYPE_NAN)
 321                 return 0;
 322
 323         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 324                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 325                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 326                                          IEEE80211_INVAL_HW_QUEUE))
 327                                 return -EINVAL;
 328                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 329                                          n_queues))
 330                                 return -EINVAL;
 331                 }
 332         }
 333
 334         if ((iftype != NL80211_IFTYPE_AP &&
 335              iftype != NL80211_IFTYPE_P2P_GO &&
 336              iftype != NL80211_IFTYPE_MESH_POINT) ||
 337             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
 338                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 339                 return 0;
 340         }
 341
 342         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 343                 return -EINVAL;
 344
 345         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 346                 return -EINVAL;
 347
 348         return 0;
 349 }
 350
 351 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 352                                     const int offset)
 353 {
 354         struct ieee80211_local *local = sdata->local;
 355         u32 flags = sdata->u.mntr.flags;
 356
 357 #define ADJUST(_f, _s)  do {                                    \
 358         if (flags & MONITOR_FLAG_##_f)                          \
 359                 local->fif_##_s += offset;                      \
 360         } while (0)
 361
 362         ADJUST(FCSFAIL, fcsfail);
 363         ADJUST(PLCPFAIL, plcpfail);
 364         ADJUST(CONTROL, control);
 365         ADJUST(CONTROL, pspoll);
 366         ADJUST(OTHER_BSS, other_bss);
 367
 368 #undef ADJUST
 369 }
 370
 371 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 372 {
 373         struct ieee80211_local *local = sdata->local;
 374         int i;
 375
 376         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 377                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
 378                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 379                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 380                         sdata->vif.hw_queue[i] = i;
 381                 else
 382                         sdata->vif.hw_queue[i] = 0;
 383         }
 384         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 385 }
 386
 387 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 388 {
 389         struct ieee80211_sub_if_data *sdata;
 390         int ret;
 391
 392         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 393                 return 0;
 394
 395         ASSERT_RTNL();
 396
 397         if (local->monitor_sdata)
 398                 return 0;
 399
 400         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 401         if (!sdata)
 402                 return -ENOMEM;
 403
 404         /* set up data */
 405         sdata->local = local;
 406         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 407         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 408                  wiphy_name(local->hw.wiphy));
 409         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
 410
 411         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 412
 413         ieee80211_set_default_queues(sdata);
 414
 415         ret = drv_add_interface(local, sdata);
 416         if (WARN_ON(ret)) {
 417                 /* ok .. stupid driver, it asked for this! */
 418                 kfree(sdata);
 419                 return ret;
 420         }
 421
 422         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 423         if (ret) {
 424                 kfree(sdata);
 425                 return ret;
 426         }
 427
 428         mutex_lock(&local->iflist_mtx);
 429         rcu_assign_pointer(local->monitor_sdata, sdata);
 430         mutex_unlock(&local->iflist_mtx);
 431
 432         mutex_lock(&local->mtx);
 433         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 434                                         IEEE80211_CHANCTX_EXCLUSIVE);
 435         mutex_unlock(&local->mtx);
 436         if (ret) {
 437                 mutex_lock(&local->iflist_mtx);
 438                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
 439                 mutex_unlock(&local->iflist_mtx);
 440                 synchronize_net();
 441                 drv_remove_interface(local, sdata);
 442                 kfree(sdata);
 443                 return ret;
 444         }
 445
 446         skb_queue_head_init(&sdata->skb_queue);
 447         INIT_WORK(&sdata->work, ieee80211_iface_work);
 448
 449         return 0;
 450 }
 451
 452 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 453 {
 454         struct ieee80211_sub_if_data *sdata;
 455
 456         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 457                 return;
 458
 459         ASSERT_RTNL();
 460
 461         mutex_lock(&local->iflist_mtx);
 462
 463         sdata = rcu_dereference_protected(local->monitor_sdata,
 464                                           lockdep_is_held(&local->iflist_mtx));
 465         if (!sdata) {
 466                 mutex_unlock(&local->iflist_mtx);
 467                 return;
 468         }
 469
 470         RCU_INIT_POINTER(local->monitor_sdata, NULL);
 471         mutex_unlock(&local->iflist_mtx);
 472
 473         synchronize_net();
 474
 475         mutex_lock(&local->mtx);
 476         ieee80211_vif_release_channel(sdata);
 477         mutex_unlock(&local->mtx);
 478
 479         drv_remove_interface(local, sdata);
 480
 481         kfree(sdata);
 482 }
 483
 484 /*
 485  * NOTE: Be very careful when changing this function, it must NOT return
 486  * an error on interface type changes that have been pre-checked, so most
 487  * checks should be in ieee80211_check_concurrent_iface.
 488  */
 489 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 490 {
 491         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 492         struct net_device *dev = wdev->netdev;
 493         struct ieee80211_local *local = sdata->local;
 494         struct sta_info *sta;
 495         u32 changed = 0;
 496         int res;
 497         u32 hw_reconf_flags = 0;
 498
 499         switch (sdata->vif.type) {
 500         case NL80211_IFTYPE_WDS:
 501                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 502                         return -ENOLINK;
 503                 break;
 504         case NL80211_IFTYPE_AP_VLAN: {
 505                 struct ieee80211_sub_if_data *master;
 506
 507                 if (!sdata->bss)
 508                         return -ENOLINK;
 509
 510                 mutex_lock(&local->mtx);
 511                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 512                 mutex_unlock(&local->mtx);
 513
 514                 master = container_of(sdata->bss,
 515                                       struct ieee80211_sub_if_data, u.ap);
 516                 sdata->control_port_protocol =
 517                         master->control_port_protocol;
 518                 sdata->control_port_no_encrypt =
 519                         master->control_port_no_encrypt;
 520                 sdata->control_port_over_nl80211 =
 521                         master->control_port_over_nl80211;
 522                 sdata->control_port_no_preauth =
 523                         master->control_port_no_preauth;
 524                 sdata->vif.cab_queue = master->vif.cab_queue;
 525                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
 526                        sizeof(sdata->vif.hw_queue));
 527                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
 528
 529                 mutex_lock(&local->key_mtx);
 530                 sdata->crypto_tx_tailroom_needed_cnt +=
 531                         master->crypto_tx_tailroom_needed_cnt;
 532                 mutex_unlock(&local->key_mtx);
 533
 534                 break;
 535                 }
 536         case NL80211_IFTYPE_AP:
 537                 sdata->bss = &sdata->u.ap;
 538                 break;
 539         case NL80211_IFTYPE_MESH_POINT:
 540         case NL80211_IFTYPE_STATION:
 541         case NL80211_IFTYPE_MONITOR:
 542         case NL80211_IFTYPE_ADHOC:
 543         case NL80211_IFTYPE_P2P_DEVICE:
 544         case NL80211_IFTYPE_OCB:
 545         case NL80211_IFTYPE_NAN:
 546                 /* no special treatment */
 547                 break;
 548         case NL80211_IFTYPE_UNSPECIFIED:
 549         case NUM_NL80211_IFTYPES:
 550         case NL80211_IFTYPE_P2P_CLIENT:
 551         case NL80211_IFTYPE_P2P_GO:
 552                 /* cannot happen */
 553                 WARN_ON(1);
 554                 break;
 555         }
 556
 557         if (local->open_count == 0) {
 558                 res = drv_start(local);
 559                 if (res)
 560                         goto err_del_bss;
 561                 /* we're brought up, everything changes */
 562                 hw_reconf_flags = ~0;
 563                 ieee80211_led_radio(local, true);
 564                 ieee80211_mod_tpt_led_trig(local,
 565                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 566         }
 567
 568         /*
 569          * Copy the hopefully now-present MAC address to
 570          * this interface, if it has the special null one.
 571          */
 572         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 573                 memcpy(dev->dev_addr,
 574                        local->hw.wiphy->perm_addr,
 575                        ETH_ALEN);
 576                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 577
 578                 if (!is_valid_ether_addr(dev->dev_addr)) {
 579                         res = -EADDRNOTAVAIL;
 580                         goto err_stop;
 581                 }
 582         }
 583
 584         switch (sdata->vif.type) {
 585         case NL80211_IFTYPE_AP_VLAN:
 586                 /* no need to tell driver, but set carrier and chanctx */
 587                 if (rtnl_dereference(sdata->bss->beacon)) {
 588                         ieee80211_vif_vlan_copy_chanctx(sdata);
 589                         netif_carrier_on(dev);
 590                 } else {
 591                         netif_carrier_off(dev);
 592                 }
 593                 break;
 594         case NL80211_IFTYPE_MONITOR:
 595                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 596                         local->cooked_mntrs++;
 597                         break;
 598                 }
 599
 600                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
 601                         res = drv_add_interface(local, sdata);
 602                         if (res)
 603                                 goto err_stop;
 604                 } else if (local->monitors == 0 && local->open_count == 0) {
 605                         res = ieee80211_add_virtual_monitor(local);
 606                         if (res)
 607                                 goto err_stop;
 608                 }
 609
 610                 /* must be before the call to ieee80211_configure_filter */
 611                 local->monitors++;
 612                 if (local->monitors == 1) {
 613                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 614                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 615                 }
 616
 617                 ieee80211_adjust_monitor_flags(sdata, 1);
 618                 ieee80211_configure_filter(local);
 619                 mutex_lock(&local->mtx);
 620                 ieee80211_recalc_idle(local);
 621                 mutex_unlock(&local->mtx);
 622
 623                 netif_carrier_on(dev);
 624                 break;
 625         default:
 626                 if (coming_up) {
 627                         ieee80211_del_virtual_monitor(local);
 628
 629                         res = drv_add_interface(local, sdata);
 630                         if (res)
 631                                 goto err_stop;
 632                         res = ieee80211_check_queues(sdata,
 633                                 ieee80211_vif_type_p2p(&sdata->vif));
 634                         if (res)
 635                                 goto err_del_interface;
 636                 }
 637
 638                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 639                         local->fif_pspoll++;
 640                         local->fif_probe_req++;
 641
 642                         ieee80211_configure_filter(local);
 643                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 644                         local->fif_probe_req++;
 645                 }
 646
 647                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
 648                     sdata->vif.type != NL80211_IFTYPE_NAN)
 649                         changed |= ieee80211_reset_erp_info(sdata);
 650                 ieee80211_bss_info_change_notify(sdata, changed);
 651
 652                 switch (sdata->vif.type) {
 653                 case NL80211_IFTYPE_STATION:
 654                 case NL80211_IFTYPE_ADHOC:
 655                 case NL80211_IFTYPE_AP:
 656                 case NL80211_IFTYPE_MESH_POINT:
 657                 case NL80211_IFTYPE_OCB:
 658                         netif_carrier_off(dev);
 659                         break;
 660                 case NL80211_IFTYPE_WDS:
 661                 case NL80211_IFTYPE_P2P_DEVICE:
 662                 case NL80211_IFTYPE_NAN:
 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         switch (sdata->vif.type) {
 682         case NL80211_IFTYPE_WDS:
 683                 /* Create STA entry for the WDS peer */
 684                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 685                                      GFP_KERNEL);
 686                 if (!sta) {
 687                         res = -ENOMEM;
 688                         goto err_del_interface;
 689                 }
 690
 691                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 692                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 693                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 694
 695                 res = sta_info_insert(sta);
 696                 if (res) {
 697                         /* STA has been freed */
 698                         goto err_del_interface;
 699                 }
 700
 701                 rate_control_rate_init(sta);
 702                 netif_carrier_on(dev);
 703                 break;
 704         case NL80211_IFTYPE_P2P_DEVICE:
 705                 rcu_assign_pointer(local->p2p_sdata, sdata);
 706                 break;
 707         case NL80211_IFTYPE_MONITOR:
 708                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
 709                         break;
 710                 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
 711                 break;
 712         default:
 713                 break;
 714         }
 715
 716         /*
 717          * set_multicast_list will be invoked by the networking core
 718          * which will check whether any increments here were done in
 719          * error and sync them down to the hardware as filter flags.
 720          */
 721         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 722                 atomic_inc(&local->iff_allmultis);
 723
 724         if (coming_up)
 725                 local->open_count++;
 726
 727         if (hw_reconf_flags)
 728                 ieee80211_hw_config(local, hw_reconf_flags);
 729
 730         ieee80211_recalc_ps(local);
 731
 732         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 733             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
 734             local->ops->wake_tx_queue) {
 735                 /* XXX: for AP_VLAN, actually track AP queues */
 736                 if (dev)
 737                         netif_tx_start_all_queues(dev);
 738         } else if (dev) {
 739                 unsigned long flags;
 740                 int n_acs = IEEE80211_NUM_ACS;
 741                 int ac;
 742
 743                 if (local->hw.queues < IEEE80211_NUM_ACS)
 744                         n_acs = 1;
 745
 746                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 747                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 748                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 749                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 750                         for (ac = 0; ac < n_acs; ac++) {
 751                                 int ac_queue = sdata->vif.hw_queue[ac];
 752
 753                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 754                                     skb_queue_empty(&local->pending[ac_queue]))
 755                                         netif_start_subqueue(dev, ac);
 756                         }
 757                 }
 758                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 759         }
 760
 761         return 0;
 762  err_del_interface:
 763         drv_remove_interface(local, sdata);
 764  err_stop:
 765         if (!local->open_count)
 766                 drv_stop(local);
 767  err_del_bss:
 768         sdata->bss = NULL;
 769         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 770                 mutex_lock(&local->mtx);
 771                 list_del(&sdata->u.vlan.list);
 772                 mutex_unlock(&local->mtx);
 773         }
 774         /* might already be clear but that doesn't matter */
 775         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 776         return res;
 777 }
 778
 779 static int ieee80211_open(struct net_device *dev)
 780 {
 781         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 782         int err;
 783
 784         /* fail early if user set an invalid address */
 785         if (!is_valid_ether_addr(dev->dev_addr))
 786                 return -EADDRNOTAVAIL;
 787
 788         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 789         if (err)
 790                 return err;
 791
 792         return ieee80211_do_open(&sdata->wdev, true);
 793 }
 794
 795 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 796                               bool going_down)
 797 {
 798         struct ieee80211_local *local = sdata->local;
 799         unsigned long flags;
 800         struct sk_buff *skb, *tmp;
 801         u32 hw_reconf_flags = 0;
 802         int i, flushed;
 803         struct ps_data *ps;
 804         struct cfg80211_chan_def chandef;
 805         bool cancel_scan;
 806         struct cfg80211_nan_func *func;
 807
 808         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 809
 810         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 811         if (cancel_scan)
 812                 ieee80211_scan_cancel(local);
 813
 814         /*
 815          * Stop TX on this interface first.
 816          */
 817         if (sdata->dev)
 818                 netif_tx_stop_all_queues(sdata->dev);
 819
 820         ieee80211_roc_purge(local, sdata);
 821
 822         switch (sdata->vif.type) {
 823         case NL80211_IFTYPE_STATION:
 824                 ieee80211_mgd_stop(sdata);
 825                 break;
 826         case NL80211_IFTYPE_ADHOC:
 827                 ieee80211_ibss_stop(sdata);
 828                 break;
 829         case NL80211_IFTYPE_MONITOR:
 830                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
 831                         break;
 832                 list_del_rcu(&sdata->u.mntr.list);
 833                 break;
 834         default:
 835                 break;
 836         }
 837
 838         /*
 839          * Remove all stations associated with this interface.
 840          *
 841          * This must be done before calling ops->remove_interface()
 842          * because otherwise we can later invoke ops->sta_notify()
 843          * whenever the STAs are removed, and that invalidates driver
 844          * assumptions about always getting a vif pointer that is valid
 845          * (because if we remove a STA after ops->remove_interface()
 846          * the driver will have removed the vif info already!)
 847          *
 848          * In WDS mode a station must exist here and be flushed, for
 849          * AP_VLANs stations may exist since there's nothing else that
 850          * would have removed them, but in other modes there shouldn't
 851          * be any stations.
 852          */
 853         flushed = sta_info_flush(sdata);
 854         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
 855                      ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 856                       (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
 857
 858         /* don't count this interface for allmulti while it is down */
 859         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 860                 atomic_dec(&local->iff_allmultis);
 861
 862         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 863                 local->fif_pspoll--;
 864                 local->fif_probe_req--;
 865         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 866                 local->fif_probe_req--;
 867         }
 868
 869         if (sdata->dev) {
 870                 netif_addr_lock_bh(sdata->dev);
 871                 spin_lock_bh(&local->filter_lock);
 872                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 873                                  sdata->dev->addr_len);
 874                 spin_unlock_bh(&local->filter_lock);
 875                 netif_addr_unlock_bh(sdata->dev);
 876         }
 877
 878         del_timer_sync(&local->dynamic_ps_timer);
 879         cancel_work_sync(&local->dynamic_ps_enable_work);
 880
 881         cancel_work_sync(&sdata->recalc_smps);
 882         sdata_lock(sdata);
 883         mutex_lock(&local->mtx);
 884         sdata->vif.csa_active = false;
 885         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 886                 sdata->u.mgd.csa_waiting_bcn = false;
 887         if (sdata->csa_block_tx) {
 888                 ieee80211_wake_vif_queues(local, sdata,
 889                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 890                 sdata->csa_block_tx = false;
 891         }
 892         mutex_unlock(&local->mtx);
 893         sdata_unlock(sdata);
 894
 895         cancel_work_sync(&sdata->csa_finalize_work);
 896
 897         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 898
 899         if (sdata->wdev.cac_started) {
 900                 chandef = sdata->vif.bss_conf.chandef;
 901                 WARN_ON(local->suspended);
 902                 mutex_lock(&local->mtx);
 903                 ieee80211_vif_release_channel(sdata);
 904                 mutex_unlock(&local->mtx);
 905                 cfg80211_cac_event(sdata->dev, &chandef,
 906                                    NL80211_RADAR_CAC_ABORTED,
 907                                    GFP_KERNEL);
 908         }
 909
 910         /* APs need special treatment */
 911         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 912                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 913
 914                 /* down all dependent devices, that is VLANs */
 915                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 916                                          u.vlan.list)
 917                         dev_close(vlan->dev);
 918                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 919         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 920                 /* remove all packets in parent bc_buf pointing to this dev */
 921                 ps = &sdata->bss->ps;
 922
 923                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 924                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 925                         if (skb->dev == sdata->dev) {
 926                                 __skb_unlink(skb, &ps->bc_buf);
 927                                 local->total_ps_buffered--;
 928                                 ieee80211_free_txskb(&local->hw, skb);
 929                         }
 930                 }
 931                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 932         }
 933
 934         if (going_down)
 935                 local->open_count--;
 936
 937         switch (sdata->vif.type) {
 938         case NL80211_IFTYPE_AP_VLAN:
 939                 mutex_lock(&local->mtx);
 940                 list_del(&sdata->u.vlan.list);
 941                 mutex_unlock(&local->mtx);
 942                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 943                 /* see comment in the default case below */
 944                 ieee80211_free_keys(sdata, true);
 945                 /* no need to tell driver */
 946                 break;
 947         case NL80211_IFTYPE_MONITOR:
 948                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 949                         local->cooked_mntrs--;
 950                         break;
 951                 }
 952
 953                 local->monitors--;
 954                 if (local->monitors == 0) {
 955                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 956                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 957                 }
 958
 959                 ieee80211_adjust_monitor_flags(sdata, -1);
 960                 break;
 961         case NL80211_IFTYPE_NAN:
 962                 /* clean all the functions */
 963                 spin_lock_bh(&sdata->u.nan.func_lock);
 964
 965                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
 966                         idr_remove(&sdata->u.nan.function_inst_ids, i);
 967                         cfg80211_free_nan_func(func);
 968                 }
 969                 idr_destroy(&sdata->u.nan.function_inst_ids);
 970
 971                 spin_unlock_bh(&sdata->u.nan.func_lock);
 972                 break;
 973         case NL80211_IFTYPE_P2P_DEVICE:
 974                 /* relies on synchronize_rcu() below */
 975                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 976                 /* fall through */
 977         default:
 978                 cancel_work_sync(&sdata->work);
 979                 /*
 980                  * When we get here, the interface is marked down.
 981                  * Free the remaining keys, if there are any
 982                  * (which can happen in AP mode if userspace sets
 983                  * keys before the interface is operating, and maybe
 984                  * also in WDS mode)
 985                  *
 986                  * Force the key freeing to always synchronize_net()
 987                  * to wait for the RX path in case it is using this
 988                  * interface enqueuing frames at this very time on
 989                  * another CPU.
 990                  */
 991                 ieee80211_free_keys(sdata, true);
 992                 skb_queue_purge(&sdata->skb_queue);
 993         }
 994
 995         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 996         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 997                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 998                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 999                         if (info->control.vif == &sdata->vif) {
1000                                 __skb_unlink(skb, &local->pending[i]);
1001                                 ieee80211_free_txskb(&local->hw, skb);
1002                         }
1003                 }
1004         }
1005         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1006
1007         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1008                 ieee80211_txq_remove_vlan(local, sdata);
1009
1010         sdata->bss = NULL;
1011
1012         if (local->open_count == 0)
1013                 ieee80211_clear_tx_pending(local);
1014
1015         sdata->vif.bss_conf.beacon_int = 0;
1016
1017         /*
1018          * If the interface goes down while suspended, presumably because
1019          * the device was unplugged and that happens before our resume,
1020          * then the driver is already unconfigured and the remainder of
1021          * this function isn't needed.
1022          * XXX: what about WoWLAN? If the device has software state, e.g.
1023          *      memory allocated, it might expect teardown commands from
1024          *      mac80211 here?
1025          */
1026         if (local->suspended) {
1027                 WARN_ON(local->wowlan);
1028                 WARN_ON(rtnl_dereference(local->monitor_sdata));
1029                 return;
1030         }
1031
1032         switch (sdata->vif.type) {
1033         case NL80211_IFTYPE_AP_VLAN:
1034                 break;
1035         case NL80211_IFTYPE_MONITOR:
1036                 if (local->monitors == 0)
1037                         ieee80211_del_virtual_monitor(local);
1038
1039                 mutex_lock(&local->mtx);
1040                 ieee80211_recalc_idle(local);
1041                 mutex_unlock(&local->mtx);
1042
1043                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1044                         break;
1045
1046                 /* fall through */
1047         default:
1048                 if (going_down)
1049                         drv_remove_interface(local, sdata);
1050         }
1051
1052         ieee80211_recalc_ps(local);
1053
1054         if (cancel_scan)
1055                 flush_delayed_work(&local->scan_work);
1056
1057         if (local->open_count == 0) {
1058                 ieee80211_stop_device(local);
1059
1060                 /* no reconfiguring after stop! */
1061                 return;
1062         }
1063
1064         /* do after stop to avoid reconfiguring when we stop anyway */
1065         ieee80211_configure_filter(local);
1066         ieee80211_hw_config(local, hw_reconf_flags);
1067
1068         if (local->monitors == local->open_count)
1069                 ieee80211_add_virtual_monitor(local);
1070 }
1071
1072 static int ieee80211_stop(struct net_device *dev)
1073 {
1074         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1075
1076         ieee80211_do_stop(sdata, true);
1077
1078         return 0;
1079 }
1080
1081 static void ieee80211_set_multicast_list(struct net_device *dev)
1082 {
1083         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1084         struct ieee80211_local *local = sdata->local;
1085         int allmulti, sdata_allmulti;
1086
1087         allmulti = !!(dev->flags & IFF_ALLMULTI);
1088         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1089
1090         if (allmulti != sdata_allmulti) {
1091                 if (dev->flags & IFF_ALLMULTI)
1092                         atomic_inc(&local->iff_allmultis);
1093                 else
1094                         atomic_dec(&local->iff_allmultis);
1095                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1096         }
1097
1098         spin_lock_bh(&local->filter_lock);
1099         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1100         spin_unlock_bh(&local->filter_lock);
1101         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1102 }
1103
1104 /*
1105  * Called when the netdev is removed or, by the code below, before
1106  * the interface type changes.
1107  */
1108 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1109 {
1110         int i;
1111
1112         /* free extra data */
1113         ieee80211_free_keys(sdata, false);
1114
1115         ieee80211_debugfs_remove_netdev(sdata);
1116
1117         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1118                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1119         sdata->fragment_next = 0;
1120
1121         if (ieee80211_vif_is_mesh(&sdata->vif))
1122                 ieee80211_mesh_teardown_sdata(sdata);
1123 }
1124
1125 static void ieee80211_uninit(struct net_device *dev)
1126 {
1127         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1128 }
1129
1130 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1131                                          struct sk_buff *skb,
1132                                          struct net_device *sb_dev)
1133 {
1134         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1135 }
1136
1137 static void
1138 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1139 {
1140         int i;
1141
1142         for_each_possible_cpu(i) {
1143                 const struct pcpu_sw_netstats *tstats;
1144                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1145                 unsigned int start;
1146
1147                 tstats = per_cpu_ptr(dev->tstats, i);
1148
1149                 do {
1150                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
1151                         rx_packets = tstats->rx_packets;
1152                         tx_packets = tstats->tx_packets;
1153                         rx_bytes = tstats->rx_bytes;
1154                         tx_bytes = tstats->tx_bytes;
1155                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1156
1157                 stats->rx_packets += rx_packets;
1158                 stats->tx_packets += tx_packets;
1159                 stats->rx_bytes   += rx_bytes;
1160                 stats->tx_bytes   += tx_bytes;
1161         }
1162 }
1163
1164 static const struct net_device_ops ieee80211_dataif_ops = {
1165         .ndo_open               = ieee80211_open,
1166         .ndo_stop               = ieee80211_stop,
1167         .ndo_uninit             = ieee80211_uninit,
1168         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1169         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1170         .ndo_set_mac_address    = ieee80211_change_mac,
1171         .ndo_select_queue       = ieee80211_netdev_select_queue,
1172         .ndo_get_stats64        = ieee80211_get_stats64,
1173 };
1174
1175 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1176                                           struct sk_buff *skb,
1177                                           struct net_device *sb_dev)
1178 {
1179         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1180         struct ieee80211_local *local = sdata->local;
1181         struct ieee80211_hdr *hdr;
1182         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1183
1184         if (local->hw.queues < IEEE80211_NUM_ACS)
1185                 return 0;
1186
1187         if (skb->len < 4 ||
1188             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1189                 return 0; /* doesn't matter, frame will be dropped */
1190
1191         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1192
1193         return ieee80211_select_queue_80211(sdata, skb, hdr);
1194 }
1195
1196 static const struct net_device_ops ieee80211_monitorif_ops = {
1197         .ndo_open               = ieee80211_open,
1198         .ndo_stop               = ieee80211_stop,
1199         .ndo_uninit             = ieee80211_uninit,
1200         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1201         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1202         .ndo_set_mac_address    = ieee80211_change_mac,
1203         .ndo_select_queue       = ieee80211_monitor_select_queue,
1204         .ndo_get_stats64        = ieee80211_get_stats64,
1205 };
1206
1207 static const struct net_device_ops ieee80211_dataif_8023_ops = {
1208         .ndo_open               = ieee80211_open,
1209         .ndo_stop               = ieee80211_stop,
1210         .ndo_uninit             = ieee80211_uninit,
1211         .ndo_start_xmit         = ieee80211_subif_start_xmit_8023,
1212         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1213         .ndo_set_mac_address    = ieee80211_change_mac,
1214         .ndo_select_queue       = ieee80211_netdev_select_queue,
1215         .ndo_get_stats64        = ieee80211_get_stats64,
1216 };
1217
1218 static void __ieee80211_set_hw_80211_encap(struct ieee80211_sub_if_data *sdata,
1219                                            bool enable)
1220 {
1221         sdata->dev->netdev_ops = enable ? &ieee80211_dataif_8023_ops :
1222                                           &ieee80211_dataif_ops;
1223         sdata->hw_80211_encap = enable;
1224 }
1225
1226 bool ieee80211_set_hw_80211_encap(struct ieee80211_vif *vif, bool enable)
1227 {
1228         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1229         struct ieee80211_local *local = sdata->local;
1230         struct ieee80211_sub_if_data *iter;
1231         struct ieee80211_key *key;
1232
1233         mutex_lock(&local->iflist_mtx);
1234         list_for_each_entry(iter, &local->interfaces, list) {
1235                 struct ieee80211_sub_if_data *disable = NULL;
1236
1237                 if (vif->type == NL80211_IFTYPE_MONITOR) {
1238                         disable = iter;
1239                         __ieee80211_set_hw_80211_encap(iter, false);
1240                 } else if (iter->vif.type == NL80211_IFTYPE_MONITOR) {
1241                         disable = sdata;
1242                         enable = false;
1243                 }
1244                 if (disable)
1245                         sdata_dbg(disable,
1246                                   "disable hw 80211 encap due to mon co-exist\n");
1247         }
1248         mutex_unlock(&local->iflist_mtx);
1249
1250         if (enable == sdata->hw_80211_encap)
1251                 return enable;
1252
1253         if (!sdata->dev)
1254                 return false;
1255
1256         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
1257             (local->hw.wiphy->frag_threshold != (u32)-1))
1258                 enable = false;
1259
1260         mutex_lock(&sdata->local->key_mtx);
1261         list_for_each_entry(key, &sdata->key_list, list) {
1262                 if (key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)
1263                         enable = false;
1264         }
1265         mutex_unlock(&sdata->local->key_mtx);
1266
1267         __ieee80211_set_hw_80211_encap(sdata, enable);
1268
1269         return enable;
1270 }
1271 EXPORT_SYMBOL(ieee80211_set_hw_80211_encap);
1272
1273 static void ieee80211_if_free(struct net_device *dev)
1274 {
1275         free_percpu(dev->tstats);
1276 }
1277
1278 static void ieee80211_if_setup(struct net_device *dev)
1279 {
1280         ether_setup(dev);
1281         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1282         dev->netdev_ops = &ieee80211_dataif_ops;
1283         dev->needs_free_netdev = true;
1284         dev->priv_destructor = ieee80211_if_free;
1285 }
1286
1287 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1288 {
1289         ieee80211_if_setup(dev);
1290         dev->priv_flags |= IFF_NO_QUEUE;
1291 }
1292
1293 static void ieee80211_iface_work(struct work_struct *work)
1294 {
1295         struct ieee80211_sub_if_data *sdata =
1296                 container_of(work, struct ieee80211_sub_if_data, work);
1297         struct ieee80211_local *local = sdata->local;
1298         struct sk_buff *skb;
1299         struct sta_info *sta;
1300
1301         if (!ieee80211_sdata_running(sdata))
1302                 return;
1303
1304         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1305                 return;
1306
1307         if (!ieee80211_can_run_worker(local))
1308                 return;
1309
1310         /* first process frames */
1311         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1312                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1313
1314                 if (ieee80211_is_action(mgmt->frame_control) &&
1315                     mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1316                         int len = skb->len;
1317
1318                         mutex_lock(&local->sta_mtx);
1319                         sta = sta_info_get_bss(sdata, mgmt->sa);
1320                         if (sta) {
1321                                 switch (mgmt->u.action.u.addba_req.action_code) {
1322                                 case WLAN_ACTION_ADDBA_REQ:
1323                                         ieee80211_process_addba_request(
1324                                                         local, sta, mgmt, len);
1325                                         break;
1326                                 case WLAN_ACTION_ADDBA_RESP:
1327                                         ieee80211_process_addba_resp(local, sta,
1328                                                                      mgmt, len);
1329                                         break;
1330                                 case WLAN_ACTION_DELBA:
1331                                         ieee80211_process_delba(sdata, sta,
1332                                                                 mgmt, len);
1333                                         break;
1334                                 default:
1335                                         WARN_ON(1);
1336                                         break;
1337                                 }
1338                         }
1339                         mutex_unlock(&local->sta_mtx);
1340                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1341                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1342                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1343                         case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1344                                 struct ieee80211_rx_status *status;
1345                                 enum nl80211_band band;
1346                                 u8 opmode;
1347
1348                                 status = IEEE80211_SKB_RXCB(skb);
1349                                 band = status->band;
1350                                 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1351
1352                                 mutex_lock(&local->sta_mtx);
1353                                 sta = sta_info_get_bss(sdata, mgmt->sa);
1354
1355                                 if (sta)
1356                                         ieee80211_vht_handle_opmode(sdata, sta,
1357                                                                     opmode,
1358                                                                     band);
1359
1360                                 mutex_unlock(&local->sta_mtx);
1361                                 break;
1362                         }
1363                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1364                                 ieee80211_process_mu_groups(sdata, mgmt);
1365                                 break;
1366                         default:
1367                                 WARN_ON(1);
1368                                 break;
1369                         }
1370                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1371                         struct ieee80211_hdr *hdr = (void *)mgmt;
1372                         /*
1373                          * So the frame isn't mgmt, but frame_control
1374                          * is at the right place anyway, of course, so
1375                          * the if statement is correct.
1376                          *
1377                          * Warn if we have other data frame types here,
1378                          * they must not get here.
1379                          */
1380                         WARN_ON(hdr->frame_control &
1381                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1382                         WARN_ON(!(hdr->seq_ctrl &
1383                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1384                         /*
1385                          * This was a fragment of a frame, received while
1386                          * a block-ack session was active. That cannot be
1387                          * right, so terminate the session.
1388                          */
1389                         mutex_lock(&local->sta_mtx);
1390                         sta = sta_info_get_bss(sdata, mgmt->sa);
1391                         if (sta) {
1392                                 u16 tid = ieee80211_get_tid(hdr);
1393
1394                                 __ieee80211_stop_rx_ba_session(
1395                                         sta, tid, WLAN_BACK_RECIPIENT,
1396                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1397                                         true);
1398                         }
1399                         mutex_unlock(&local->sta_mtx);
1400                 } else switch (sdata->vif.type) {
1401                 case NL80211_IFTYPE_STATION:
1402                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1403                         break;
1404                 case NL80211_IFTYPE_ADHOC:
1405                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1406                         break;
1407                 case NL80211_IFTYPE_MESH_POINT:
1408                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1409                                 break;
1410                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1411                         break;
1412                 default:
1413                         WARN(1, "frame for unexpected interface type");
1414                         break;
1415                 }
1416
1417                 kfree_skb(skb);
1418         }
1419
1420         /* then other type-dependent work */
1421         switch (sdata->vif.type) {
1422         case NL80211_IFTYPE_STATION:
1423                 ieee80211_sta_work(sdata);
1424                 break;
1425         case NL80211_IFTYPE_ADHOC:
1426                 ieee80211_ibss_work(sdata);
1427                 break;
1428         case NL80211_IFTYPE_MESH_POINT:
1429                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1430                         break;
1431                 ieee80211_mesh_work(sdata);
1432                 break;
1433         case NL80211_IFTYPE_OCB:
1434                 ieee80211_ocb_work(sdata);
1435                 break;
1436         default:
1437                 break;
1438         }
1439 }
1440
1441 static void ieee80211_recalc_smps_work(struct work_struct *work)
1442 {
1443         struct ieee80211_sub_if_data *sdata =
1444                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1445
1446         ieee80211_recalc_smps(sdata);
1447 }
1448
1449 /*
1450  * Helper function to initialise an interface to a specific type.
1451  */
1452 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1453                                   enum nl80211_iftype type)
1454 {
1455         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1456                                                     0xff, 0xff, 0xff};
1457
1458         /* clear type-dependent union */
1459         memset(&sdata->u, 0, sizeof(sdata->u));
1460
1461         /* and set some type-dependent values */
1462         sdata->vif.type = type;
1463         sdata->vif.p2p = false;
1464         sdata->wdev.iftype = type;
1465
1466         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1467         sdata->control_port_no_encrypt = false;
1468         sdata->control_port_over_nl80211 = false;
1469         sdata->control_port_no_preauth = false;
1470         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1471         sdata->vif.bss_conf.idle = true;
1472         sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1473
1474         sdata->noack_map = 0;
1475         sdata->hw_80211_encap = false;
1476
1477         /* only monitor/p2p-device differ */
1478         if (sdata->dev) {
1479                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1480                 sdata->dev->type = ARPHRD_ETHER;
1481         }
1482
1483         skb_queue_head_init(&sdata->skb_queue);
1484         INIT_WORK(&sdata->work, ieee80211_iface_work);
1485         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1486         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1487         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1488         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1489
1490         switch (type) {
1491         case NL80211_IFTYPE_P2P_GO:
1492                 type = NL80211_IFTYPE_AP;
1493                 sdata->vif.type = type;
1494                 sdata->vif.p2p = true;
1495                 /* fall through */
1496         case NL80211_IFTYPE_AP:
1497                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1498                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1499                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1500                 break;
1501         case NL80211_IFTYPE_P2P_CLIENT:
1502                 type = NL80211_IFTYPE_STATION;
1503                 sdata->vif.type = type;
1504                 sdata->vif.p2p = true;
1505                 /* fall through */
1506         case NL80211_IFTYPE_STATION:
1507                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1508                 ieee80211_sta_setup_sdata(sdata);
1509                 break;
1510         case NL80211_IFTYPE_OCB:
1511                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1512                 ieee80211_ocb_setup_sdata(sdata);
1513                 break;
1514         case NL80211_IFTYPE_ADHOC:
1515                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1516                 ieee80211_ibss_setup_sdata(sdata);
1517                 break;
1518         case NL80211_IFTYPE_MESH_POINT:
1519                 if (ieee80211_vif_is_mesh(&sdata->vif))
1520                         ieee80211_mesh_init_sdata(sdata);
1521                 break;
1522         case NL80211_IFTYPE_MONITOR:
1523                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1524                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1525                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1526                                       MONITOR_FLAG_OTHER_BSS;
1527                 break;
1528         case NL80211_IFTYPE_WDS:
1529                 sdata->vif.bss_conf.bssid = NULL;
1530                 break;
1531         case NL80211_IFTYPE_NAN:
1532                 idr_init(&sdata->u.nan.function_inst_ids);
1533                 spin_lock_init(&sdata->u.nan.func_lock);
1534                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1535                 break;
1536         case NL80211_IFTYPE_AP_VLAN:
1537         case NL80211_IFTYPE_P2P_DEVICE:
1538                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1539                 break;
1540         case NL80211_IFTYPE_UNSPECIFIED:
1541         case NUM_NL80211_IFTYPES:
1542                 WARN_ON(1);
1543                 break;
1544         }
1545
1546         ieee80211_debugfs_add_netdev(sdata);
1547 }
1548
1549 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1550                                            enum nl80211_iftype type)
1551 {
1552         struct ieee80211_local *local = sdata->local;
1553         int ret, err;
1554         enum nl80211_iftype internal_type = type;
1555         bool p2p = false;
1556
1557         ASSERT_RTNL();
1558
1559         if (!local->ops->change_interface)
1560                 return -EBUSY;
1561
1562         switch (sdata->vif.type) {
1563         case NL80211_IFTYPE_AP:
1564         case NL80211_IFTYPE_STATION:
1565         case NL80211_IFTYPE_ADHOC:
1566         case NL80211_IFTYPE_OCB:
1567                 /*
1568                  * Could maybe also all others here?
1569                  * Just not sure how that interacts
1570                  * with the RX/config path e.g. for
1571                  * mesh.
1572                  */
1573                 break;
1574         default:
1575                 return -EBUSY;
1576         }
1577
1578         switch (type) {
1579         case NL80211_IFTYPE_AP:
1580         case NL80211_IFTYPE_STATION:
1581         case NL80211_IFTYPE_ADHOC:
1582         case NL80211_IFTYPE_OCB:
1583                 /*
1584                  * Could probably support everything
1585                  * but WDS here (WDS do_open can fail
1586                  * under memory pressure, which this
1587                  * code isn't prepared to handle).
1588                  */
1589                 break;
1590         case NL80211_IFTYPE_P2P_CLIENT:
1591                 p2p = true;
1592                 internal_type = NL80211_IFTYPE_STATION;
1593                 break;
1594         case NL80211_IFTYPE_P2P_GO:
1595                 p2p = true;
1596                 internal_type = NL80211_IFTYPE_AP;
1597                 break;
1598         default:
1599                 return -EBUSY;
1600         }
1601
1602         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1603         if (ret)
1604                 return ret;
1605
1606         ieee80211_do_stop(sdata, false);
1607
1608         ieee80211_teardown_sdata(sdata);
1609
1610         ret = drv_change_interface(local, sdata, internal_type, p2p);
1611         if (ret)
1612                 type = ieee80211_vif_type_p2p(&sdata->vif);
1613
1614         /*
1615          * Ignore return value here, there's not much we can do since
1616          * the driver changed the interface type internally already.
1617          * The warnings will hopefully make driver authors fix it :-)
1618          */
1619         ieee80211_check_queues(sdata, type);
1620
1621         ieee80211_setup_sdata(sdata, type);
1622
1623         err = ieee80211_do_open(&sdata->wdev, false);
1624         WARN(err, "type change: do_open returned %d", err);
1625
1626         return ret;
1627 }
1628
1629 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1630                              enum nl80211_iftype type)
1631 {
1632         int ret;
1633
1634         ASSERT_RTNL();
1635
1636         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1637                 return 0;
1638
1639         if (ieee80211_sdata_running(sdata)) {
1640                 ret = ieee80211_runtime_change_iftype(sdata, type);
1641                 if (ret)
1642                         return ret;
1643         } else {
1644                 /* Purge and reset type-dependent state. */
1645                 ieee80211_teardown_sdata(sdata);
1646                 ieee80211_setup_sdata(sdata, type);
1647         }
1648
1649         /* reset some values that shouldn't be kept across type changes */
1650         if (type == NL80211_IFTYPE_STATION)
1651                 sdata->u.mgd.use_4addr = false;
1652
1653         return 0;
1654 }
1655
1656 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1657                                        u8 *perm_addr, enum nl80211_iftype type)
1658 {
1659         struct ieee80211_sub_if_data *sdata;
1660         u64 mask, start, addr, val, inc;
1661         u8 *m;
1662         u8 tmp_addr[ETH_ALEN];
1663         int i;
1664
1665         /* default ... something at least */
1666         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1667
1668         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1669             local->hw.wiphy->n_addresses <= 1)
1670                 return;
1671
1672         mutex_lock(&local->iflist_mtx);
1673
1674         switch (type) {
1675         case NL80211_IFTYPE_MONITOR:
1676                 /* doesn't matter */
1677                 break;
1678         case NL80211_IFTYPE_WDS:
1679         case NL80211_IFTYPE_AP_VLAN:
1680                 /* match up with an AP interface */
1681                 list_for_each_entry(sdata, &local->interfaces, list) {
1682                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1683                                 continue;
1684                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1685                         break;
1686                 }
1687                 /* keep default if no AP interface present */
1688                 break;
1689         case NL80211_IFTYPE_P2P_CLIENT:
1690         case NL80211_IFTYPE_P2P_GO:
1691                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1692                         list_for_each_entry(sdata, &local->interfaces, list) {
1693                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1694                                         continue;
1695                                 if (!ieee80211_sdata_running(sdata))
1696                                         continue;
1697                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1698                                 goto out_unlock;
1699                         }
1700                 }
1701                 /* fall through */
1702         default:
1703                 /* assign a new address if possible -- try n_addresses first */
1704                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1705                         bool used = false;
1706
1707                         list_for_each_entry(sdata, &local->interfaces, list) {
1708                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1709                                                      sdata->vif.addr)) {
1710                                         used = true;
1711                                         break;
1712                                 }
1713                         }
1714
1715                         if (!used) {
1716                                 memcpy(perm_addr,
1717                                        local->hw.wiphy->addresses[i].addr,
1718                                        ETH_ALEN);
1719                                 break;
1720                         }
1721                 }
1722
1723                 /* try mask if available */
1724                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1725                         break;
1726
1727                 m = local->hw.wiphy->addr_mask;
1728                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1729                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1730                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1731
1732                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1733                         /* not a contiguous mask ... not handled now! */
1734                         pr_info("not contiguous\n");
1735                         break;
1736                 }
1737
1738                 /*
1739                  * Pick address of existing interface in case user changed
1740                  * MAC address manually, default to perm_addr.
1741                  */
1742                 m = local->hw.wiphy->perm_addr;
1743                 list_for_each_entry(sdata, &local->interfaces, list) {
1744                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1745                                 continue;
1746                         m = sdata->vif.addr;
1747                         break;
1748                 }
1749                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1750                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1751                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1752
1753                 inc = 1ULL<<__ffs64(mask);
1754                 val = (start & mask);
1755                 addr = (start & ~mask) | (val & mask);
1756                 do {
1757                         bool used = false;
1758
1759                         tmp_addr[5] = addr >> 0*8;
1760                         tmp_addr[4] = addr >> 1*8;
1761                         tmp_addr[3] = addr >> 2*8;
1762                         tmp_addr[2] = addr >> 3*8;
1763                         tmp_addr[1] = addr >> 4*8;
1764                         tmp_addr[0] = addr >> 5*8;
1765
1766                         val += inc;
1767
1768                         list_for_each_entry(sdata, &local->interfaces, list) {
1769                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1770                                         used = true;
1771                                         break;
1772                                 }
1773                         }
1774
1775                         if (!used) {
1776                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1777                                 break;
1778                         }
1779                         addr = (start & ~mask) | (val & mask);
1780                 } while (addr != start);
1781
1782                 break;
1783         }
1784
1785  out_unlock:
1786         mutex_unlock(&local->iflist_mtx);
1787 }
1788
1789 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1790                      unsigned char name_assign_type,
1791                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1792                      struct vif_params *params)
1793 {
1794         struct net_device *ndev = NULL;
1795         struct ieee80211_sub_if_data *sdata = NULL;
1796         struct txq_info *txqi;
1797         void (*if_setup)(struct net_device *dev);
1798         int ret, i;
1799         int txqs = 1;
1800
1801         ASSERT_RTNL();
1802
1803         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1804                 struct wireless_dev *wdev;
1805
1806                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1807                                 GFP_KERNEL);
1808                 if (!sdata)
1809                         return -ENOMEM;
1810                 wdev = &sdata->wdev;
1811
1812                 sdata->dev = NULL;
1813                 strlcpy(sdata->name, name, IFNAMSIZ);
1814                 ieee80211_assign_perm_addr(local, wdev->address, type);
1815                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1816         } else {
1817                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1818                                  sizeof(void *));
1819                 int txq_size = 0;
1820
1821                 if (local->ops->wake_tx_queue &&
1822                     type != NL80211_IFTYPE_AP_VLAN &&
1823                     (type != NL80211_IFTYPE_MONITOR ||
1824                      (params->flags & MONITOR_FLAG_ACTIVE)))
1825                         txq_size += sizeof(struct txq_info) +
1826                                     local->hw.txq_data_size;
1827
1828                 if (local->ops->wake_tx_queue) {
1829                         if_setup = ieee80211_if_setup_no_queue;
1830                 } else {
1831                         if_setup = ieee80211_if_setup;
1832                         if (local->hw.queues >= IEEE80211_NUM_ACS)
1833                                 txqs = IEEE80211_NUM_ACS;
1834                 }
1835
1836                 ndev = alloc_netdev_mqs(size + txq_size,
1837                                         name, name_assign_type,
1838                                         if_setup, txqs, 1);
1839                 if (!ndev)
1840                         return -ENOMEM;
1841
1842                 if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len)
1843                         ndev->tx_queue_len = local->hw.wiphy->tx_queue_len;
1844
1845                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1846
1847                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1848                 if (!ndev->tstats) {
1849                         free_netdev(ndev);
1850                         return -ENOMEM;
1851                 }
1852
1853                 ndev->needed_headroom = local->tx_headroom +
1854                                         4*6 /* four MAC addresses */
1855                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1856                                         + 6 /* mesh */
1857                                         + 8 /* rfc1042/bridge tunnel */
1858                                         - ETH_HLEN /* ethernet hard_header_len */
1859                                         + IEEE80211_ENCRYPT_HEADROOM;
1860                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1861
1862                 ret = dev_alloc_name(ndev, ndev->name);
1863                 if (ret < 0) {
1864                         ieee80211_if_free(ndev);
1865                         free_netdev(ndev);
1866                         return ret;
1867                 }
1868
1869                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1870                 if (is_valid_ether_addr(params->macaddr))
1871                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1872                 else
1873                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1874                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1875
1876                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1877                 sdata = netdev_priv(ndev);
1878                 ndev->ieee80211_ptr = &sdata->wdev;
1879                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1880                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1881
1882                 if (txq_size) {
1883                         txqi = netdev_priv(ndev) + size;
1884                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1885                 }
1886
1887                 sdata->dev = ndev;
1888         }
1889
1890         /* initialise type-independent data */
1891         sdata->wdev.wiphy = local->hw.wiphy;
1892         sdata->local = local;
1893
1894         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1895                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1896
1897         INIT_LIST_HEAD(&sdata->key_list);
1898
1899         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1900                           ieee80211_dfs_cac_timer_work);
1901         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1902                           ieee80211_delayed_tailroom_dec);
1903
1904         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1905                 struct ieee80211_supported_band *sband;
1906                 sband = local->hw.wiphy->bands[i];
1907                 sdata->rc_rateidx_mask[i] =
1908                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1909                 if (sband) {
1910                         __le16 cap;
1911                         u16 *vht_rate_mask;
1912
1913                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1914                                sband->ht_cap.mcs.rx_mask,
1915                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1916
1917                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1918                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1919                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1920                 } else {
1921                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1922                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1923                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1924                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1925                 }
1926         }
1927
1928         ieee80211_set_default_queues(sdata);
1929
1930         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1931         sdata->user_power_level = local->user_power_level;
1932
1933         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1934
1935         /* setup type-dependent data */
1936         ieee80211_setup_sdata(sdata, type);
1937
1938         if (ndev) {
1939                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1940                 if (type == NL80211_IFTYPE_STATION)
1941                         sdata->u.mgd.use_4addr = params->use_4addr;
1942
1943                 ndev->features |= local->hw.netdev_features;
1944                 ndev->hw_features |= ndev->features &
1945                                         MAC80211_SUPPORTED_FEATURES_TX;
1946
1947                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1948
1949                 /* MTU range: 256 - 2304 */
1950                 ndev->min_mtu = 256;
1951                 ndev->max_mtu = local->hw.max_mtu;
1952
1953                 ret = register_netdevice(ndev);
1954                 if (ret) {
1955                         free_netdev(ndev);
1956                         return ret;
1957                 }
1958         }
1959
1960         mutex_lock(&local->iflist_mtx);
1961         list_add_tail_rcu(&sdata->list, &local->interfaces);
1962         mutex_unlock(&local->iflist_mtx);
1963
1964         if (new_wdev)
1965                 *new_wdev = &sdata->wdev;
1966
1967         return 0;
1968 }
1969
1970 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1971 {
1972         ASSERT_RTNL();
1973
1974         mutex_lock(&sdata->local->iflist_mtx);
1975         list_del_rcu(&sdata->list);
1976         mutex_unlock(&sdata->local->iflist_mtx);
1977
1978         if (sdata->vif.txq)
1979                 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
1980
1981         synchronize_rcu();
1982
1983         if (sdata->dev) {
1984                 unregister_netdevice(sdata->dev);
1985         } else {
1986                 cfg80211_unregister_wdev(&sdata->wdev);
1987                 ieee80211_teardown_sdata(sdata);
1988                 kfree(sdata);
1989         }
1990 }
1991
1992 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1993 {
1994         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1995                 return;
1996         ieee80211_do_stop(sdata, true);
1997 }
1998
1999 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2000 {
2001         struct ieee80211_sub_if_data *sdata, *tmp;
2002         LIST_HEAD(unreg_list);
2003         LIST_HEAD(wdev_list);
2004
2005         ASSERT_RTNL();
2006
2007         /* Before destroying the interfaces, make sure they're all stopped so
2008          * that the hardware is stopped. Otherwise, the driver might still be
2009          * iterating the interfaces during the shutdown, e.g. from a worker
2010          * or from RX processing or similar, and if it does so (using atomic
2011          * iteration) while we're manipulating the list, the iteration will
2012          * crash.
2013          *
2014          * After this, the hardware should be stopped and the driver should
2015          * have stopped all of its activities, so that we can do RCU-unaware
2016          * manipulations of the interface list below.
2017          */
2018         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2019
2020         WARN(local->open_count, "%s: open count remains %d\n",
2021              wiphy_name(local->hw.wiphy), local->open_count);
2022
2023         ieee80211_txq_teardown_flows(local);
2024
2025         mutex_lock(&local->iflist_mtx);
2026         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
2027                 list_del(&sdata->list);
2028
2029                 if (sdata->dev)
2030                         unregister_netdevice_queue(sdata->dev, &unreg_list);
2031                 else
2032                         list_add(&sdata->list, &wdev_list);
2033         }
2034         mutex_unlock(&local->iflist_mtx);
2035         unregister_netdevice_many(&unreg_list);
2036
2037         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2038                 list_del(&sdata->list);
2039                 cfg80211_unregister_wdev(&sdata->wdev);
2040                 kfree(sdata);
2041         }
2042 }
2043
2044 static int netdev_notify(struct notifier_block *nb,
2045                          unsigned long state, void *ptr)
2046 {
2047         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2048         struct ieee80211_sub_if_data *sdata;
2049
2050         if (state != NETDEV_CHANGENAME)
2051                 return NOTIFY_DONE;
2052
2053         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2054                 return NOTIFY_DONE;
2055
2056         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2057                 return NOTIFY_DONE;
2058
2059         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2060         memcpy(sdata->name, dev->name, IFNAMSIZ);
2061         ieee80211_debugfs_rename_netdev(sdata);
2062
2063         return NOTIFY_OK;
2064 }
2065
2066 static struct notifier_block mac80211_netdev_notifier = {
2067         .notifier_call = netdev_notify,
2068 };
2069
2070 int ieee80211_iface_init(void)
2071 {
2072         return register_netdevice_notifier(&mac80211_netdev_notifier);
2073 }
2074
2075 void ieee80211_iface_exit(void)
2076 {
2077         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2078 }
2079
2080 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2081 {
2082         if (sdata->vif.type == NL80211_IFTYPE_AP)
2083                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2084         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2085                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2086 }
2087
2088 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2089 {
2090         if (sdata->vif.type == NL80211_IFTYPE_AP)
2091                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2092         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2093                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2094 }