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 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  47 {
  48         struct ieee80211_chanctx_conf *chanctx_conf;
  49         int power;
  50
  51         rcu_read_lock();
  52         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  53         if (!chanctx_conf) {
  54                 rcu_read_unlock();
  55                 return false;
  56         }
  57
  58         power = ieee80211_chandef_max_power(&chanctx_conf->def);
  59         rcu_read_unlock();
  60
  61         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  62                 power = min(power, sdata->user_power_level);
  63
  64         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  65                 power = min(power, sdata->ap_power_level);
  66
  67         if (power != sdata->vif.bss_conf.txpower) {
  68                 sdata->vif.bss_conf.txpower = power;
  69                 ieee80211_hw_config(sdata->local, 0);
  70                 return true;
  71         }
  72
  73         return false;
  74 }
  75
  76 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
  77                               bool update_bss)
  78 {
  79         if (__ieee80211_recalc_txpower(sdata) || update_bss)
  80                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  81 }
  82
  83 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
  84 {
  85         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  86                 return 0;
  87
  88         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  89         return IEEE80211_CONF_CHANGE_IDLE;
  90 }
  91
  92 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  93 {
  94         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  95                 return 0;
  96
  97         ieee80211_flush_queues(local, NULL, false);
  98
  99         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 100         return IEEE80211_CONF_CHANGE_IDLE;
 101 }
 102
 103 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
 104                                    bool force_active)
 105 {
 106         bool working, scanning, active;
 107         unsigned int led_trig_start = 0, led_trig_stop = 0;
 108
 109         lockdep_assert_held(&local->mtx);
 110
 111         active = force_active ||
 112                  !list_empty(&local->chanctx_list) ||
 113                  local->monitors;
 114
 115         working = !local->ops->remain_on_channel &&
 116                   !list_empty(&local->roc_list);
 117
 118         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 119                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 120
 121         if (working || scanning)
 122                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 123         else
 124                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 125
 126         if (active)
 127                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 128         else
 129                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 130
 131         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 132
 133         if (working || scanning || active)
 134                 return __ieee80211_idle_off(local);
 135         return __ieee80211_idle_on(local);
 136 }
 137
 138 u32 ieee80211_idle_off(struct ieee80211_local *local)
 139 {
 140         return __ieee80211_recalc_idle(local, true);
 141 }
 142
 143 void ieee80211_recalc_idle(struct ieee80211_local *local)
 144 {
 145         u32 change = __ieee80211_recalc_idle(local, false);
 146         if (change)
 147                 ieee80211_hw_config(local, change);
 148 }
 149
 150 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 151 {
 152         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
 153                 return -EINVAL;
 154
 155         dev->mtu = new_mtu;
 156         return 0;
 157 }
 158
 159 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 160                                 bool check_dup)
 161 {
 162         struct ieee80211_local *local = sdata->local;
 163         struct ieee80211_sub_if_data *iter;
 164         u64 new, mask, tmp;
 165         u8 *m;
 166         int ret = 0;
 167
 168         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 169                 return 0;
 170
 171         m = addr;
 172         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 173                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 174                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 175
 176         m = local->hw.wiphy->addr_mask;
 177         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 178                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 179                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 180
 181         if (!check_dup)
 182                 return ret;
 183
 184         mutex_lock(&local->iflist_mtx);
 185         list_for_each_entry(iter, &local->interfaces, list) {
 186                 if (iter == sdata)
 187                         continue;
 188
 189                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 190                     !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 191                         continue;
 192
 193                 m = iter->vif.addr;
 194                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 195                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 196                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 197
 198                 if ((new & ~mask) != (tmp & ~mask)) {
 199                         ret = -EINVAL;
 200                         break;
 201                 }
 202         }
 203         mutex_unlock(&local->iflist_mtx);
 204
 205         return ret;
 206 }
 207
 208 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 209 {
 210         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 211         struct sockaddr *sa = addr;
 212         bool check_dup = true;
 213         int ret;
 214
 215         if (ieee80211_sdata_running(sdata))
 216                 return -EBUSY;
 217
 218         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 219             !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 220                 check_dup = false;
 221
 222         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 223         if (ret)
 224                 return ret;
 225
 226         ret = eth_mac_addr(dev, sa);
 227
 228         if (ret == 0)
 229                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 230
 231         return ret;
 232 }
 233
 234 static inline int identical_mac_addr_allowed(int type1, int type2)
 235 {
 236         return type1 == NL80211_IFTYPE_MONITOR ||
 237                 type2 == NL80211_IFTYPE_MONITOR ||
 238                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 239                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 240                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 241                 (type1 == NL80211_IFTYPE_WDS &&
 242                         (type2 == NL80211_IFTYPE_WDS ||
 243                          type2 == NL80211_IFTYPE_AP)) ||
 244                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 245                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 246                         (type2 == NL80211_IFTYPE_AP ||
 247                          type2 == NL80211_IFTYPE_AP_VLAN));
 248 }
 249
 250 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 251                                             enum nl80211_iftype iftype)
 252 {
 253         struct ieee80211_local *local = sdata->local;
 254         struct ieee80211_sub_if_data *nsdata;
 255         int ret;
 256
 257         ASSERT_RTNL();
 258
 259         /* we hold the RTNL here so can safely walk the list */
 260         list_for_each_entry(nsdata, &local->interfaces, list) {
 261                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 262                         /*
 263                          * Only OCB and monitor mode may coexist
 264                          */
 265                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
 266                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
 267                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 268                              nsdata->vif.type == NL80211_IFTYPE_OCB))
 269                                 return -EBUSY;
 270
 271                         /*
 272                          * Allow only a single IBSS interface to be up at any
 273                          * time. This is restricted because beacon distribution
 274                          * cannot work properly if both are in the same IBSS.
 275                          *
 276                          * To remove this restriction we'd have to disallow them
 277                          * from setting the same SSID on different IBSS interfaces
 278                          * belonging to the same hardware. Then, however, we're
 279                          * faced with having to adopt two different TSF timers...
 280                          */
 281                         if (iftype == NL80211_IFTYPE_ADHOC &&
 282                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 283                                 return -EBUSY;
 284                         /*
 285                          * will not add another interface while any channel
 286                          * switch is active.
 287                          */
 288                         if (nsdata->vif.csa_active)
 289                                 return -EBUSY;
 290
 291                         /*
 292                          * The remaining checks are only performed for interfaces
 293                          * with the same MAC address.
 294                          */
 295                         if (!ether_addr_equal(sdata->vif.addr,
 296                                               nsdata->vif.addr))
 297                                 continue;
 298
 299                         /*
 300                          * check whether it may have the same address
 301                          */
 302                         if (!identical_mac_addr_allowed(iftype,
 303                                                         nsdata->vif.type))
 304                                 return -ENOTUNIQ;
 305
 306                         /*
 307                          * can only add VLANs to enabled APs
 308                          */
 309                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 310                             nsdata->vif.type == NL80211_IFTYPE_AP)
 311                                 sdata->bss = &nsdata->u.ap;
 312                 }
 313         }
 314
 315         mutex_lock(&local->chanctx_mtx);
 316         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
 317         mutex_unlock(&local->chanctx_mtx);
 318         return ret;
 319 }
 320
 321 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 322                                   enum nl80211_iftype iftype)
 323 {
 324         int n_queues = sdata->local->hw.queues;
 325         int i;
 326
 327         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 328                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 329                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 330                                          IEEE80211_INVAL_HW_QUEUE))
 331                                 return -EINVAL;
 332                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 333                                          n_queues))
 334                                 return -EINVAL;
 335                 }
 336         }
 337
 338         if ((iftype != NL80211_IFTYPE_AP &&
 339              iftype != NL80211_IFTYPE_P2P_GO &&
 340              iftype != NL80211_IFTYPE_MESH_POINT) ||
 341             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
 342                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 343                 return 0;
 344         }
 345
 346         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 347                 return -EINVAL;
 348
 349         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 350                 return -EINVAL;
 351
 352         return 0;
 353 }
 354
 355 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 356                                     const int offset)
 357 {
 358         struct ieee80211_local *local = sdata->local;
 359         u32 flags = sdata->u.mntr_flags;
 360
 361 #define ADJUST(_f, _s)  do {                                    \
 362         if (flags & MONITOR_FLAG_##_f)                          \
 363                 local->fif_##_s += offset;                      \
 364         } while (0)
 365
 366         ADJUST(FCSFAIL, fcsfail);
 367         ADJUST(PLCPFAIL, plcpfail);
 368         ADJUST(CONTROL, control);
 369         ADJUST(CONTROL, pspoll);
 370         ADJUST(OTHER_BSS, other_bss);
 371
 372 #undef ADJUST
 373 }
 374
 375 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 376 {
 377         struct ieee80211_local *local = sdata->local;
 378         int i;
 379
 380         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 381                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
 382                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 383                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 384                         sdata->vif.hw_queue[i] = i;
 385                 else
 386                         sdata->vif.hw_queue[i] = 0;
 387         }
 388         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 389 }
 390
 391 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 392 {
 393         struct ieee80211_sub_if_data *sdata;
 394         int ret;
 395
 396         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 397                 return 0;
 398
 399         ASSERT_RTNL();
 400
 401         if (local->monitor_sdata)
 402                 return 0;
 403
 404         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 405         if (!sdata)
 406                 return -ENOMEM;
 407
 408         /* set up data */
 409         sdata->local = local;
 410         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 411         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 412                  wiphy_name(local->hw.wiphy));
 413         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
 414
 415         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 416
 417         ieee80211_set_default_queues(sdata);
 418
 419         ret = drv_add_interface(local, sdata);
 420         if (WARN_ON(ret)) {
 421                 /* ok .. stupid driver, it asked for this! */
 422                 kfree(sdata);
 423                 return ret;
 424         }
 425
 426         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 427         if (ret) {
 428                 kfree(sdata);
 429                 return ret;
 430         }
 431
 432         mutex_lock(&local->iflist_mtx);
 433         rcu_assign_pointer(local->monitor_sdata, sdata);
 434         mutex_unlock(&local->iflist_mtx);
 435
 436         mutex_lock(&local->mtx);
 437         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 438                                         IEEE80211_CHANCTX_EXCLUSIVE);
 439         mutex_unlock(&local->mtx);
 440         if (ret) {
 441                 mutex_lock(&local->iflist_mtx);
 442                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
 443                 mutex_unlock(&local->iflist_mtx);
 444                 synchronize_net();
 445                 drv_remove_interface(local, sdata);
 446                 kfree(sdata);
 447                 return ret;
 448         }
 449
 450         return 0;
 451 }
 452
 453 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 454 {
 455         struct ieee80211_sub_if_data *sdata;
 456
 457         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 458                 return;
 459
 460         ASSERT_RTNL();
 461
 462         mutex_lock(&local->iflist_mtx);
 463
 464         sdata = rcu_dereference_protected(local->monitor_sdata,
 465                                           lockdep_is_held(&local->iflist_mtx));
 466         if (!sdata) {
 467                 mutex_unlock(&local->iflist_mtx);
 468                 return;
 469         }
 470
 471         RCU_INIT_POINTER(local->monitor_sdata, NULL);
 472         mutex_unlock(&local->iflist_mtx);
 473
 474         synchronize_net();
 475
 476         mutex_lock(&local->mtx);
 477         ieee80211_vif_release_channel(sdata);
 478         mutex_unlock(&local->mtx);
 479
 480         drv_remove_interface(local, sdata);
 481
 482         kfree(sdata);
 483 }
 484
 485 /*
 486  * NOTE: Be very careful when changing this function, it must NOT return
 487  * an error on interface type changes that have been pre-checked, so most
 488  * checks should be in ieee80211_check_concurrent_iface.
 489  */
 490 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 491 {
 492         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 493         struct net_device *dev = wdev->netdev;
 494         struct ieee80211_local *local = sdata->local;
 495         struct sta_info *sta;
 496         u32 changed = 0;
 497         int res;
 498         u32 hw_reconf_flags = 0;
 499
 500         switch (sdata->vif.type) {
 501         case NL80211_IFTYPE_WDS:
 502                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 503                         return -ENOLINK;
 504                 break;
 505         case NL80211_IFTYPE_AP_VLAN: {
 506                 struct ieee80211_sub_if_data *master;
 507
 508                 if (!sdata->bss)
 509                         return -ENOLINK;
 510
 511                 mutex_lock(&local->mtx);
 512                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 513                 mutex_unlock(&local->mtx);
 514
 515                 master = container_of(sdata->bss,
 516                                       struct ieee80211_sub_if_data, u.ap);
 517                 sdata->control_port_protocol =
 518                         master->control_port_protocol;
 519                 sdata->control_port_no_encrypt =
 520                         master->control_port_no_encrypt;
 521                 sdata->vif.cab_queue = master->vif.cab_queue;
 522                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
 523                        sizeof(sdata->vif.hw_queue));
 524                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
 525
 526                 mutex_lock(&local->key_mtx);
 527                 sdata->crypto_tx_tailroom_needed_cnt +=
 528                         master->crypto_tx_tailroom_needed_cnt;
 529                 mutex_unlock(&local->key_mtx);
 530
 531                 break;
 532                 }
 533         case NL80211_IFTYPE_AP:
 534                 sdata->bss = &sdata->u.ap;
 535                 break;
 536         case NL80211_IFTYPE_MESH_POINT:
 537         case NL80211_IFTYPE_STATION:
 538         case NL80211_IFTYPE_MONITOR:
 539         case NL80211_IFTYPE_ADHOC:
 540         case NL80211_IFTYPE_P2P_DEVICE:
 541         case NL80211_IFTYPE_OCB:
 542                 /* no special treatment */
 543                 break;
 544         case NL80211_IFTYPE_UNSPECIFIED:
 545         case NUM_NL80211_IFTYPES:
 546         case NL80211_IFTYPE_P2P_CLIENT:
 547         case NL80211_IFTYPE_P2P_GO:
 548                 /* cannot happen */
 549                 WARN_ON(1);
 550                 break;
 551         }
 552
 553         if (local->open_count == 0) {
 554                 res = drv_start(local);
 555                 if (res)
 556                         goto err_del_bss;
 557                 /* we're brought up, everything changes */
 558                 hw_reconf_flags = ~0;
 559                 ieee80211_led_radio(local, true);
 560                 ieee80211_mod_tpt_led_trig(local,
 561                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 562         }
 563
 564         /*
 565          * Copy the hopefully now-present MAC address to
 566          * this interface, if it has the special null one.
 567          */
 568         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 569                 memcpy(dev->dev_addr,
 570                        local->hw.wiphy->perm_addr,
 571                        ETH_ALEN);
 572                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 573
 574                 if (!is_valid_ether_addr(dev->dev_addr)) {
 575                         res = -EADDRNOTAVAIL;
 576                         goto err_stop;
 577                 }
 578         }
 579
 580         switch (sdata->vif.type) {
 581         case NL80211_IFTYPE_AP_VLAN:
 582                 /* no need to tell driver, but set carrier and chanctx */
 583                 if (rtnl_dereference(sdata->bss->beacon)) {
 584                         ieee80211_vif_vlan_copy_chanctx(sdata);
 585                         netif_carrier_on(dev);
 586                 } else {
 587                         netif_carrier_off(dev);
 588                 }
 589                 break;
 590         case NL80211_IFTYPE_MONITOR:
 591                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 592                         local->cooked_mntrs++;
 593                         break;
 594                 }
 595
 596                 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
 597                         res = drv_add_interface(local, sdata);
 598                         if (res)
 599                                 goto err_stop;
 600                 } else if (local->monitors == 0 && local->open_count == 0) {
 601                         res = ieee80211_add_virtual_monitor(local);
 602                         if (res)
 603                                 goto err_stop;
 604                 }
 605
 606                 /* must be before the call to ieee80211_configure_filter */
 607                 local->monitors++;
 608                 if (local->monitors == 1) {
 609                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 610                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 611                 }
 612
 613                 ieee80211_adjust_monitor_flags(sdata, 1);
 614                 ieee80211_configure_filter(local);
 615                 mutex_lock(&local->mtx);
 616                 ieee80211_recalc_idle(local);
 617                 mutex_unlock(&local->mtx);
 618
 619                 netif_carrier_on(dev);
 620                 break;
 621         default:
 622                 if (coming_up) {
 623                         ieee80211_del_virtual_monitor(local);
 624
 625                         res = drv_add_interface(local, sdata);
 626                         if (res)
 627                                 goto err_stop;
 628                         res = ieee80211_check_queues(sdata,
 629                                 ieee80211_vif_type_p2p(&sdata->vif));
 630                         if (res)
 631                                 goto err_del_interface;
 632                 }
 633
 634                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 635                         local->fif_pspoll++;
 636                         local->fif_probe_req++;
 637
 638                         ieee80211_configure_filter(local);
 639                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 640                         local->fif_probe_req++;
 641                 }
 642
 643                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 644                         changed |= ieee80211_reset_erp_info(sdata);
 645                 ieee80211_bss_info_change_notify(sdata, changed);
 646
 647                 switch (sdata->vif.type) {
 648                 case NL80211_IFTYPE_STATION:
 649                 case NL80211_IFTYPE_ADHOC:
 650                 case NL80211_IFTYPE_AP:
 651                 case NL80211_IFTYPE_MESH_POINT:
 652                 case NL80211_IFTYPE_OCB:
 653                         netif_carrier_off(dev);
 654                         break;
 655                 case NL80211_IFTYPE_WDS:
 656                 case NL80211_IFTYPE_P2P_DEVICE:
 657                         break;
 658                 default:
 659                         /* not reached */
 660                         WARN_ON(1);
 661                 }
 662
 663                 /*
 664                  * Set default queue parameters so drivers don't
 665                  * need to initialise the hardware if the hardware
 666                  * doesn't start up with sane defaults.
 667                  * Enable QoS for anything but station interfaces.
 668                  */
 669                 ieee80211_set_wmm_default(sdata, true,
 670                         sdata->vif.type != NL80211_IFTYPE_STATION);
 671         }
 672
 673         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 674
 675         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 676                 /* Create STA entry for the WDS peer */
 677                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 678                                      GFP_KERNEL);
 679                 if (!sta) {
 680                         res = -ENOMEM;
 681                         goto err_del_interface;
 682                 }
 683
 684                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 685                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 686                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 687
 688                 res = sta_info_insert(sta);
 689                 if (res) {
 690                         /* STA has been freed */
 691                         goto err_del_interface;
 692                 }
 693
 694                 rate_control_rate_init(sta);
 695                 netif_carrier_on(dev);
 696         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 697                 rcu_assign_pointer(local->p2p_sdata, sdata);
 698         }
 699
 700         /*
 701          * set_multicast_list will be invoked by the networking core
 702          * which will check whether any increments here were done in
 703          * error and sync them down to the hardware as filter flags.
 704          */
 705         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 706                 atomic_inc(&local->iff_allmultis);
 707
 708         if (coming_up)
 709                 local->open_count++;
 710
 711         if (hw_reconf_flags)
 712                 ieee80211_hw_config(local, hw_reconf_flags);
 713
 714         ieee80211_recalc_ps(local);
 715
 716         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 717             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 718                 /* XXX: for AP_VLAN, actually track AP queues */
 719                 netif_tx_start_all_queues(dev);
 720         } else if (dev) {
 721                 unsigned long flags;
 722                 int n_acs = IEEE80211_NUM_ACS;
 723                 int ac;
 724
 725                 if (local->hw.queues < IEEE80211_NUM_ACS)
 726                         n_acs = 1;
 727
 728                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 729                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 730                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 731                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 732                         for (ac = 0; ac < n_acs; ac++) {
 733                                 int ac_queue = sdata->vif.hw_queue[ac];
 734
 735                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 736                                     skb_queue_empty(&local->pending[ac_queue]))
 737                                         netif_start_subqueue(dev, ac);
 738                         }
 739                 }
 740                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 741         }
 742
 743         return 0;
 744  err_del_interface:
 745         drv_remove_interface(local, sdata);
 746  err_stop:
 747         if (!local->open_count)
 748                 drv_stop(local);
 749  err_del_bss:
 750         sdata->bss = NULL;
 751         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 752                 mutex_lock(&local->mtx);
 753                 list_del(&sdata->u.vlan.list);
 754                 mutex_unlock(&local->mtx);
 755         }
 756         /* might already be clear but that doesn't matter */
 757         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 758         return res;
 759 }
 760
 761 static int ieee80211_open(struct net_device *dev)
 762 {
 763         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 764         int err;
 765
 766         /* fail early if user set an invalid address */
 767         if (!is_valid_ether_addr(dev->dev_addr))
 768                 return -EADDRNOTAVAIL;
 769
 770         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 771         if (err)
 772                 return err;
 773
 774         return ieee80211_do_open(&sdata->wdev, true);
 775 }
 776
 777 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 778                               bool going_down)
 779 {
 780         struct ieee80211_local *local = sdata->local;
 781         unsigned long flags;
 782         struct sk_buff *skb, *tmp;
 783         u32 hw_reconf_flags = 0;
 784         int i, flushed;
 785         struct ps_data *ps;
 786         struct cfg80211_chan_def chandef;
 787         bool cancel_scan;
 788
 789         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 790
 791         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 792         if (cancel_scan)
 793                 ieee80211_scan_cancel(local);
 794
 795         /*
 796          * Stop TX on this interface first.
 797          */
 798         if (sdata->dev)
 799                 netif_tx_stop_all_queues(sdata->dev);
 800
 801         ieee80211_roc_purge(local, sdata);
 802
 803         switch (sdata->vif.type) {
 804         case NL80211_IFTYPE_STATION:
 805                 ieee80211_mgd_stop(sdata);
 806                 break;
 807         case NL80211_IFTYPE_ADHOC:
 808                 ieee80211_ibss_stop(sdata);
 809                 break;
 810         case NL80211_IFTYPE_AP:
 811                 cancel_work_sync(&sdata->u.ap.request_smps_work);
 812                 break;
 813         default:
 814                 break;
 815         }
 816
 817         /*
 818          * Remove all stations associated with this interface.
 819          *
 820          * This must be done before calling ops->remove_interface()
 821          * because otherwise we can later invoke ops->sta_notify()
 822          * whenever the STAs are removed, and that invalidates driver
 823          * assumptions about always getting a vif pointer that is valid
 824          * (because if we remove a STA after ops->remove_interface()
 825          * the driver will have removed the vif info already!)
 826          *
 827          * In WDS mode a station must exist here and be flushed, for
 828          * AP_VLANs stations may exist since there's nothing else that
 829          * would have removed them, but in other modes there shouldn't
 830          * be any stations.
 831          */
 832         flushed = sta_info_flush(sdata);
 833         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
 834                      ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 835                       (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
 836
 837         /* don't count this interface for allmulti while it is down */
 838         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 839                 atomic_dec(&local->iff_allmultis);
 840
 841         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 842                 local->fif_pspoll--;
 843                 local->fif_probe_req--;
 844         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 845                 local->fif_probe_req--;
 846         }
 847
 848         if (sdata->dev) {
 849                 netif_addr_lock_bh(sdata->dev);
 850                 spin_lock_bh(&local->filter_lock);
 851                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 852                                  sdata->dev->addr_len);
 853                 spin_unlock_bh(&local->filter_lock);
 854                 netif_addr_unlock_bh(sdata->dev);
 855         }
 856
 857         del_timer_sync(&local->dynamic_ps_timer);
 858         cancel_work_sync(&local->dynamic_ps_enable_work);
 859
 860         cancel_work_sync(&sdata->recalc_smps);
 861         sdata_lock(sdata);
 862         mutex_lock(&local->mtx);
 863         sdata->vif.csa_active = false;
 864         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 865                 sdata->u.mgd.csa_waiting_bcn = false;
 866         if (sdata->csa_block_tx) {
 867                 ieee80211_wake_vif_queues(local, sdata,
 868                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 869                 sdata->csa_block_tx = false;
 870         }
 871         mutex_unlock(&local->mtx);
 872         sdata_unlock(sdata);
 873
 874         cancel_work_sync(&sdata->csa_finalize_work);
 875
 876         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 877
 878         if (sdata->wdev.cac_started) {
 879                 chandef = sdata->vif.bss_conf.chandef;
 880                 WARN_ON(local->suspended);
 881                 mutex_lock(&local->mtx);
 882                 ieee80211_vif_release_channel(sdata);
 883                 mutex_unlock(&local->mtx);
 884                 cfg80211_cac_event(sdata->dev, &chandef,
 885                                    NL80211_RADAR_CAC_ABORTED,
 886                                    GFP_KERNEL);
 887         }
 888
 889         /* APs need special treatment */
 890         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 891                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 892
 893                 /* down all dependent devices, that is VLANs */
 894                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 895                                          u.vlan.list)
 896                         dev_close(vlan->dev);
 897                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 898         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 899                 /* remove all packets in parent bc_buf pointing to this dev */
 900                 ps = &sdata->bss->ps;
 901
 902                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 903                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 904                         if (skb->dev == sdata->dev) {
 905                                 __skb_unlink(skb, &ps->bc_buf);
 906                                 local->total_ps_buffered--;
 907                                 ieee80211_free_txskb(&local->hw, skb);
 908                         }
 909                 }
 910                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 911         }
 912
 913         if (going_down)
 914                 local->open_count--;
 915
 916         switch (sdata->vif.type) {
 917         case NL80211_IFTYPE_AP_VLAN:
 918                 mutex_lock(&local->mtx);
 919                 list_del(&sdata->u.vlan.list);
 920                 mutex_unlock(&local->mtx);
 921                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 922                 /* see comment in the default case below */
 923                 ieee80211_free_keys(sdata, true);
 924                 /* no need to tell driver */
 925                 break;
 926         case NL80211_IFTYPE_MONITOR:
 927                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 928                         local->cooked_mntrs--;
 929                         break;
 930                 }
 931
 932                 local->monitors--;
 933                 if (local->monitors == 0) {
 934                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 935                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 936                 }
 937
 938                 ieee80211_adjust_monitor_flags(sdata, -1);
 939                 break;
 940         case NL80211_IFTYPE_P2P_DEVICE:
 941                 /* relies on synchronize_rcu() below */
 942                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 943                 /* fall through */
 944         default:
 945                 cancel_work_sync(&sdata->work);
 946                 /*
 947                  * When we get here, the interface is marked down.
 948                  * Free the remaining keys, if there are any
 949                  * (which can happen in AP mode if userspace sets
 950                  * keys before the interface is operating, and maybe
 951                  * also in WDS mode)
 952                  *
 953                  * Force the key freeing to always synchronize_net()
 954                  * to wait for the RX path in case it is using this
 955                  * interface enqueuing frames at this very time on
 956                  * another CPU.
 957                  */
 958                 ieee80211_free_keys(sdata, true);
 959                 skb_queue_purge(&sdata->skb_queue);
 960         }
 961
 962         sdata->bss = NULL;
 963
 964         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 965         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 966                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 967                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 968                         if (info->control.vif == &sdata->vif) {
 969                                 __skb_unlink(skb, &local->pending[i]);
 970                                 ieee80211_free_txskb(&local->hw, skb);
 971                         }
 972                 }
 973         }
 974         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 975
 976         if (sdata->vif.txq) {
 977                 struct txq_info *txqi = to_txq_info(sdata->vif.txq);
 978
 979                 ieee80211_purge_tx_queue(&local->hw, &txqi->queue);
 980                 atomic_set(&sdata->txqs_len[txqi->txq.ac], 0);
 981         }
 982
 983         if (local->open_count == 0)
 984                 ieee80211_clear_tx_pending(local);
 985
 986         /*
 987          * If the interface goes down while suspended, presumably because
 988          * the device was unplugged and that happens before our resume,
 989          * then the driver is already unconfigured and the remainder of
 990          * this function isn't needed.
 991          * XXX: what about WoWLAN? If the device has software state, e.g.
 992          *      memory allocated, it might expect teardown commands from
 993          *      mac80211 here?
 994          */
 995         if (local->suspended) {
 996                 WARN_ON(local->wowlan);
 997                 WARN_ON(rtnl_dereference(local->monitor_sdata));
 998                 return;
 999         }
1000
1001         switch (sdata->vif.type) {
1002         case NL80211_IFTYPE_AP_VLAN:
1003                 break;
1004         case NL80211_IFTYPE_MONITOR:
1005                 if (local->monitors == 0)
1006                         ieee80211_del_virtual_monitor(local);
1007
1008                 mutex_lock(&local->mtx);
1009                 ieee80211_recalc_idle(local);
1010                 mutex_unlock(&local->mtx);
1011
1012                 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
1013                         break;
1014
1015                 /* fall through */
1016         default:
1017                 if (going_down)
1018                         drv_remove_interface(local, sdata);
1019         }
1020
1021         ieee80211_recalc_ps(local);
1022
1023         if (cancel_scan)
1024                 flush_delayed_work(&local->scan_work);
1025
1026         if (local->open_count == 0) {
1027                 ieee80211_stop_device(local);
1028
1029                 /* no reconfiguring after stop! */
1030                 return;
1031         }
1032
1033         /* do after stop to avoid reconfiguring when we stop anyway */
1034         ieee80211_configure_filter(local);
1035         ieee80211_hw_config(local, hw_reconf_flags);
1036
1037         if (local->monitors == local->open_count)
1038                 ieee80211_add_virtual_monitor(local);
1039 }
1040
1041 static int ieee80211_stop(struct net_device *dev)
1042 {
1043         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1044
1045         ieee80211_do_stop(sdata, true);
1046
1047         return 0;
1048 }
1049
1050 static void ieee80211_set_multicast_list(struct net_device *dev)
1051 {
1052         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1053         struct ieee80211_local *local = sdata->local;
1054         int allmulti, sdata_allmulti;
1055
1056         allmulti = !!(dev->flags & IFF_ALLMULTI);
1057         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1058
1059         if (allmulti != sdata_allmulti) {
1060                 if (dev->flags & IFF_ALLMULTI)
1061                         atomic_inc(&local->iff_allmultis);
1062                 else
1063                         atomic_dec(&local->iff_allmultis);
1064                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1065         }
1066
1067         spin_lock_bh(&local->filter_lock);
1068         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1069         spin_unlock_bh(&local->filter_lock);
1070         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1071 }
1072
1073 /*
1074  * Called when the netdev is removed or, by the code below, before
1075  * the interface type changes.
1076  */
1077 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1078 {
1079         int i;
1080
1081         /* free extra data */
1082         ieee80211_free_keys(sdata, false);
1083
1084         ieee80211_debugfs_remove_netdev(sdata);
1085
1086         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1087                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1088         sdata->fragment_next = 0;
1089
1090         if (ieee80211_vif_is_mesh(&sdata->vif))
1091                 mesh_rmc_free(sdata);
1092 }
1093
1094 static void ieee80211_uninit(struct net_device *dev)
1095 {
1096         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1097 }
1098
1099 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1100                                          struct sk_buff *skb,
1101                                          void *accel_priv,
1102                                          select_queue_fallback_t fallback)
1103 {
1104         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1105 }
1106
1107 static struct rtnl_link_stats64 *
1108 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1109 {
1110         int i;
1111
1112         for_each_possible_cpu(i) {
1113                 const struct pcpu_sw_netstats *tstats;
1114                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1115                 unsigned int start;
1116
1117                 tstats = per_cpu_ptr(dev->tstats, i);
1118
1119                 do {
1120                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
1121                         rx_packets = tstats->rx_packets;
1122                         tx_packets = tstats->tx_packets;
1123                         rx_bytes = tstats->rx_bytes;
1124                         tx_bytes = tstats->tx_bytes;
1125                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1126
1127                 stats->rx_packets += rx_packets;
1128                 stats->tx_packets += tx_packets;
1129                 stats->rx_bytes   += rx_bytes;
1130                 stats->tx_bytes   += tx_bytes;
1131         }
1132
1133         return stats;
1134 }
1135
1136 static const struct net_device_ops ieee80211_dataif_ops = {
1137         .ndo_open               = ieee80211_open,
1138         .ndo_stop               = ieee80211_stop,
1139         .ndo_uninit             = ieee80211_uninit,
1140         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1141         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1142         .ndo_change_mtu         = ieee80211_change_mtu,
1143         .ndo_set_mac_address    = ieee80211_change_mac,
1144         .ndo_select_queue       = ieee80211_netdev_select_queue,
1145         .ndo_get_stats64        = ieee80211_get_stats64,
1146 };
1147
1148 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1149                                           struct sk_buff *skb,
1150                                           void *accel_priv,
1151                                           select_queue_fallback_t fallback)
1152 {
1153         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1154         struct ieee80211_local *local = sdata->local;
1155         struct ieee80211_hdr *hdr;
1156         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1157
1158         if (local->hw.queues < IEEE80211_NUM_ACS)
1159                 return 0;
1160
1161         if (skb->len < 4 ||
1162             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1163                 return 0; /* doesn't matter, frame will be dropped */
1164
1165         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1166
1167         return ieee80211_select_queue_80211(sdata, skb, hdr);
1168 }
1169
1170 static const struct net_device_ops ieee80211_monitorif_ops = {
1171         .ndo_open               = ieee80211_open,
1172         .ndo_stop               = ieee80211_stop,
1173         .ndo_uninit             = ieee80211_uninit,
1174         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1175         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1176         .ndo_change_mtu         = ieee80211_change_mtu,
1177         .ndo_set_mac_address    = ieee80211_change_mac,
1178         .ndo_select_queue       = ieee80211_monitor_select_queue,
1179         .ndo_get_stats64        = ieee80211_get_stats64,
1180 };
1181
1182 static void ieee80211_if_free(struct net_device *dev)
1183 {
1184         free_percpu(dev->tstats);
1185         free_netdev(dev);
1186 }
1187
1188 static void ieee80211_if_setup(struct net_device *dev)
1189 {
1190         ether_setup(dev);
1191         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1192         dev->netdev_ops = &ieee80211_dataif_ops;
1193         dev->destructor = ieee80211_if_free;
1194 }
1195
1196 static void ieee80211_iface_work(struct work_struct *work)
1197 {
1198         struct ieee80211_sub_if_data *sdata =
1199                 container_of(work, struct ieee80211_sub_if_data, work);
1200         struct ieee80211_local *local = sdata->local;
1201         struct sk_buff *skb;
1202         struct sta_info *sta;
1203         struct ieee80211_ra_tid *ra_tid;
1204         struct ieee80211_rx_agg *rx_agg;
1205
1206         if (!ieee80211_sdata_running(sdata))
1207                 return;
1208
1209         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1210                 return;
1211
1212         if (!ieee80211_can_run_worker(local))
1213                 return;
1214
1215         /* first process frames */
1216         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1217                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1218
1219                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1220                         ra_tid = (void *)&skb->cb;
1221                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1222                                                  ra_tid->tid);
1223                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1224                         ra_tid = (void *)&skb->cb;
1225                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1226                                                 ra_tid->tid);
1227                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1228                         rx_agg = (void *)&skb->cb;
1229                         mutex_lock(&local->sta_mtx);
1230                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1231                         if (sta)
1232                                 __ieee80211_start_rx_ba_session(sta,
1233                                                 0, 0, 0, 1, rx_agg->tid,
1234                                                 IEEE80211_MAX_AMPDU_BUF,
1235                                                 false, true);
1236                         mutex_unlock(&local->sta_mtx);
1237                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1238                         rx_agg = (void *)&skb->cb;
1239                         mutex_lock(&local->sta_mtx);
1240                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1241                         if (sta)
1242                                 __ieee80211_stop_rx_ba_session(sta,
1243                                                         rx_agg->tid,
1244                                                         WLAN_BACK_RECIPIENT, 0,
1245                                                         false);
1246                         mutex_unlock(&local->sta_mtx);
1247                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1248                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1249                         int len = skb->len;
1250
1251                         mutex_lock(&local->sta_mtx);
1252                         sta = sta_info_get_bss(sdata, mgmt->sa);
1253                         if (sta) {
1254                                 switch (mgmt->u.action.u.addba_req.action_code) {
1255                                 case WLAN_ACTION_ADDBA_REQ:
1256                                         ieee80211_process_addba_request(
1257                                                         local, sta, mgmt, len);
1258                                         break;
1259                                 case WLAN_ACTION_ADDBA_RESP:
1260                                         ieee80211_process_addba_resp(local, sta,
1261                                                                      mgmt, len);
1262                                         break;
1263                                 case WLAN_ACTION_DELBA:
1264                                         ieee80211_process_delba(sdata, sta,
1265                                                                 mgmt, len);
1266                                         break;
1267                                 default:
1268                                         WARN_ON(1);
1269                                         break;
1270                                 }
1271                         }
1272                         mutex_unlock(&local->sta_mtx);
1273                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1274                         struct ieee80211_hdr *hdr = (void *)mgmt;
1275                         /*
1276                          * So the frame isn't mgmt, but frame_control
1277                          * is at the right place anyway, of course, so
1278                          * the if statement is correct.
1279                          *
1280                          * Warn if we have other data frame types here,
1281                          * they must not get here.
1282                          */
1283                         WARN_ON(hdr->frame_control &
1284                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1285                         WARN_ON(!(hdr->seq_ctrl &
1286                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1287                         /*
1288                          * This was a fragment of a frame, received while
1289                          * a block-ack session was active. That cannot be
1290                          * right, so terminate the session.
1291                          */
1292                         mutex_lock(&local->sta_mtx);
1293                         sta = sta_info_get_bss(sdata, mgmt->sa);
1294                         if (sta) {
1295                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1296                                                 IEEE80211_QOS_CTL_TID_MASK;
1297
1298                                 __ieee80211_stop_rx_ba_session(
1299                                         sta, tid, WLAN_BACK_RECIPIENT,
1300                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1301                                         true);
1302                         }
1303                         mutex_unlock(&local->sta_mtx);
1304                 } else switch (sdata->vif.type) {
1305                 case NL80211_IFTYPE_STATION:
1306                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1307                         break;
1308                 case NL80211_IFTYPE_ADHOC:
1309                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1310                         break;
1311                 case NL80211_IFTYPE_MESH_POINT:
1312                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1313                                 break;
1314                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1315                         break;
1316                 default:
1317                         WARN(1, "frame for unexpected interface type");
1318                         break;
1319                 }
1320
1321                 kfree_skb(skb);
1322         }
1323
1324         /* then other type-dependent work */
1325         switch (sdata->vif.type) {
1326         case NL80211_IFTYPE_STATION:
1327                 ieee80211_sta_work(sdata);
1328                 break;
1329         case NL80211_IFTYPE_ADHOC:
1330                 ieee80211_ibss_work(sdata);
1331                 break;
1332         case NL80211_IFTYPE_MESH_POINT:
1333                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1334                         break;
1335                 ieee80211_mesh_work(sdata);
1336                 break;
1337         case NL80211_IFTYPE_OCB:
1338                 ieee80211_ocb_work(sdata);
1339                 break;
1340         default:
1341                 break;
1342         }
1343 }
1344
1345 static void ieee80211_recalc_smps_work(struct work_struct *work)
1346 {
1347         struct ieee80211_sub_if_data *sdata =
1348                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1349
1350         ieee80211_recalc_smps(sdata);
1351 }
1352
1353 /*
1354  * Helper function to initialise an interface to a specific type.
1355  */
1356 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1357                                   enum nl80211_iftype type)
1358 {
1359         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1360                                                     0xff, 0xff, 0xff};
1361
1362         /* clear type-dependent union */
1363         memset(&sdata->u, 0, sizeof(sdata->u));
1364
1365         /* and set some type-dependent values */
1366         sdata->vif.type = type;
1367         sdata->vif.p2p = false;
1368         sdata->wdev.iftype = type;
1369
1370         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1371         sdata->control_port_no_encrypt = false;
1372         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1373         sdata->vif.bss_conf.idle = true;
1374
1375         sdata->noack_map = 0;
1376
1377         /* only monitor/p2p-device differ */
1378         if (sdata->dev) {
1379                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1380                 sdata->dev->type = ARPHRD_ETHER;
1381         }
1382
1383         skb_queue_head_init(&sdata->skb_queue);
1384         INIT_WORK(&sdata->work, ieee80211_iface_work);
1385         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1386         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1387         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1388         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1389
1390         switch (type) {
1391         case NL80211_IFTYPE_P2P_GO:
1392                 type = NL80211_IFTYPE_AP;
1393                 sdata->vif.type = type;
1394                 sdata->vif.p2p = true;
1395                 /* fall through */
1396         case NL80211_IFTYPE_AP:
1397                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1398                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1399                 INIT_WORK(&sdata->u.ap.request_smps_work,
1400                           ieee80211_request_smps_ap_work);
1401                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1402                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1403                 break;
1404         case NL80211_IFTYPE_P2P_CLIENT:
1405                 type = NL80211_IFTYPE_STATION;
1406                 sdata->vif.type = type;
1407                 sdata->vif.p2p = true;
1408                 /* fall through */
1409         case NL80211_IFTYPE_STATION:
1410                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1411                 ieee80211_sta_setup_sdata(sdata);
1412                 break;
1413         case NL80211_IFTYPE_OCB:
1414                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1415                 ieee80211_ocb_setup_sdata(sdata);
1416                 break;
1417         case NL80211_IFTYPE_ADHOC:
1418                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1419                 ieee80211_ibss_setup_sdata(sdata);
1420                 break;
1421         case NL80211_IFTYPE_MESH_POINT:
1422                 if (ieee80211_vif_is_mesh(&sdata->vif))
1423                         ieee80211_mesh_init_sdata(sdata);
1424                 break;
1425         case NL80211_IFTYPE_MONITOR:
1426                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1427                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1428                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1429                                       MONITOR_FLAG_OTHER_BSS;
1430                 break;
1431         case NL80211_IFTYPE_WDS:
1432                 sdata->vif.bss_conf.bssid = NULL;
1433                 break;
1434         case NL80211_IFTYPE_AP_VLAN:
1435         case NL80211_IFTYPE_P2P_DEVICE:
1436                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1437                 break;
1438         case NL80211_IFTYPE_UNSPECIFIED:
1439         case NUM_NL80211_IFTYPES:
1440                 BUG();
1441                 break;
1442         }
1443
1444         ieee80211_debugfs_add_netdev(sdata);
1445 }
1446
1447 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1448                                            enum nl80211_iftype type)
1449 {
1450         struct ieee80211_local *local = sdata->local;
1451         int ret, err;
1452         enum nl80211_iftype internal_type = type;
1453         bool p2p = false;
1454
1455         ASSERT_RTNL();
1456
1457         if (!local->ops->change_interface)
1458                 return -EBUSY;
1459
1460         switch (sdata->vif.type) {
1461         case NL80211_IFTYPE_AP:
1462         case NL80211_IFTYPE_STATION:
1463         case NL80211_IFTYPE_ADHOC:
1464         case NL80211_IFTYPE_OCB:
1465                 /*
1466                  * Could maybe also all others here?
1467                  * Just not sure how that interacts
1468                  * with the RX/config path e.g. for
1469                  * mesh.
1470                  */
1471                 break;
1472         default:
1473                 return -EBUSY;
1474         }
1475
1476         switch (type) {
1477         case NL80211_IFTYPE_AP:
1478         case NL80211_IFTYPE_STATION:
1479         case NL80211_IFTYPE_ADHOC:
1480         case NL80211_IFTYPE_OCB:
1481                 /*
1482                  * Could probably support everything
1483                  * but WDS here (WDS do_open can fail
1484                  * under memory pressure, which this
1485                  * code isn't prepared to handle).
1486                  */
1487                 break;
1488         case NL80211_IFTYPE_P2P_CLIENT:
1489                 p2p = true;
1490                 internal_type = NL80211_IFTYPE_STATION;
1491                 break;
1492         case NL80211_IFTYPE_P2P_GO:
1493                 p2p = true;
1494                 internal_type = NL80211_IFTYPE_AP;
1495                 break;
1496         default:
1497                 return -EBUSY;
1498         }
1499
1500         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1501         if (ret)
1502                 return ret;
1503
1504         ieee80211_do_stop(sdata, false);
1505
1506         ieee80211_teardown_sdata(sdata);
1507
1508         ret = drv_change_interface(local, sdata, internal_type, p2p);
1509         if (ret)
1510                 type = ieee80211_vif_type_p2p(&sdata->vif);
1511
1512         /*
1513          * Ignore return value here, there's not much we can do since
1514          * the driver changed the interface type internally already.
1515          * The warnings will hopefully make driver authors fix it :-)
1516          */
1517         ieee80211_check_queues(sdata, type);
1518
1519         ieee80211_setup_sdata(sdata, type);
1520
1521         err = ieee80211_do_open(&sdata->wdev, false);
1522         WARN(err, "type change: do_open returned %d", err);
1523
1524         return ret;
1525 }
1526
1527 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1528                              enum nl80211_iftype type)
1529 {
1530         int ret;
1531
1532         ASSERT_RTNL();
1533
1534         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1535                 return 0;
1536
1537         if (ieee80211_sdata_running(sdata)) {
1538                 ret = ieee80211_runtime_change_iftype(sdata, type);
1539                 if (ret)
1540                         return ret;
1541         } else {
1542                 /* Purge and reset type-dependent state. */
1543                 ieee80211_teardown_sdata(sdata);
1544                 ieee80211_setup_sdata(sdata, type);
1545         }
1546
1547         /* reset some values that shouldn't be kept across type changes */
1548         if (type == NL80211_IFTYPE_STATION)
1549                 sdata->u.mgd.use_4addr = false;
1550
1551         return 0;
1552 }
1553
1554 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1555                                        u8 *perm_addr, enum nl80211_iftype type)
1556 {
1557         struct ieee80211_sub_if_data *sdata;
1558         u64 mask, start, addr, val, inc;
1559         u8 *m;
1560         u8 tmp_addr[ETH_ALEN];
1561         int i;
1562
1563         /* default ... something at least */
1564         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1565
1566         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1567             local->hw.wiphy->n_addresses <= 1)
1568                 return;
1569
1570         mutex_lock(&local->iflist_mtx);
1571
1572         switch (type) {
1573         case NL80211_IFTYPE_MONITOR:
1574                 /* doesn't matter */
1575                 break;
1576         case NL80211_IFTYPE_WDS:
1577         case NL80211_IFTYPE_AP_VLAN:
1578                 /* match up with an AP interface */
1579                 list_for_each_entry(sdata, &local->interfaces, list) {
1580                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1581                                 continue;
1582                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1583                         break;
1584                 }
1585                 /* keep default if no AP interface present */
1586                 break;
1587         case NL80211_IFTYPE_P2P_CLIENT:
1588         case NL80211_IFTYPE_P2P_GO:
1589                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1590                         list_for_each_entry(sdata, &local->interfaces, list) {
1591                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1592                                         continue;
1593                                 if (!ieee80211_sdata_running(sdata))
1594                                         continue;
1595                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1596                                 goto out_unlock;
1597                         }
1598                 }
1599                 /* otherwise fall through */
1600         default:
1601                 /* assign a new address if possible -- try n_addresses first */
1602                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1603                         bool used = false;
1604
1605                         list_for_each_entry(sdata, &local->interfaces, list) {
1606                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1607                                                      sdata->vif.addr)) {
1608                                         used = true;
1609                                         break;
1610                                 }
1611                         }
1612
1613                         if (!used) {
1614                                 memcpy(perm_addr,
1615                                        local->hw.wiphy->addresses[i].addr,
1616                                        ETH_ALEN);
1617                                 break;
1618                         }
1619                 }
1620
1621                 /* try mask if available */
1622                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1623                         break;
1624
1625                 m = local->hw.wiphy->addr_mask;
1626                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1627                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1628                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1629
1630                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1631                         /* not a contiguous mask ... not handled now! */
1632                         pr_info("not contiguous\n");
1633                         break;
1634                 }
1635
1636                 /*
1637                  * Pick address of existing interface in case user changed
1638                  * MAC address manually, default to perm_addr.
1639                  */
1640                 m = local->hw.wiphy->perm_addr;
1641                 list_for_each_entry(sdata, &local->interfaces, list) {
1642                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1643                                 continue;
1644                         m = sdata->vif.addr;
1645                         break;
1646                 }
1647                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1648                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1649                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1650
1651                 inc = 1ULL<<__ffs64(mask);
1652                 val = (start & mask);
1653                 addr = (start & ~mask) | (val & mask);
1654                 do {
1655                         bool used = false;
1656
1657                         tmp_addr[5] = addr >> 0*8;
1658                         tmp_addr[4] = addr >> 1*8;
1659                         tmp_addr[3] = addr >> 2*8;
1660                         tmp_addr[2] = addr >> 3*8;
1661                         tmp_addr[1] = addr >> 4*8;
1662                         tmp_addr[0] = addr >> 5*8;
1663
1664                         val += inc;
1665
1666                         list_for_each_entry(sdata, &local->interfaces, list) {
1667                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1668                                         used = true;
1669                                         break;
1670                                 }
1671                         }
1672
1673                         if (!used) {
1674                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1675                                 break;
1676                         }
1677                         addr = (start & ~mask) | (val & mask);
1678                 } while (addr != start);
1679
1680                 break;
1681         }
1682
1683  out_unlock:
1684         mutex_unlock(&local->iflist_mtx);
1685 }
1686
1687 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1688                      unsigned char name_assign_type,
1689                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1690                      struct vif_params *params)
1691 {
1692         struct net_device *ndev = NULL;
1693         struct ieee80211_sub_if_data *sdata = NULL;
1694         struct txq_info *txqi;
1695         int ret, i;
1696         int txqs = 1;
1697
1698         ASSERT_RTNL();
1699
1700         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1701                 struct wireless_dev *wdev;
1702
1703                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1704                                 GFP_KERNEL);
1705                 if (!sdata)
1706                         return -ENOMEM;
1707                 wdev = &sdata->wdev;
1708
1709                 sdata->dev = NULL;
1710                 strlcpy(sdata->name, name, IFNAMSIZ);
1711                 ieee80211_assign_perm_addr(local, wdev->address, type);
1712                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1713         } else {
1714                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1715                                  sizeof(void *));
1716                 int txq_size = 0;
1717
1718                 if (local->ops->wake_tx_queue)
1719                         txq_size += sizeof(struct txq_info) +
1720                                     local->hw.txq_data_size;
1721
1722                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1723                         txqs = IEEE80211_NUM_ACS;
1724
1725                 ndev = alloc_netdev_mqs(size + txq_size,
1726                                         name, name_assign_type,
1727                                         ieee80211_if_setup, txqs, 1);
1728                 if (!ndev)
1729                         return -ENOMEM;
1730                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1731
1732                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1733                 if (!ndev->tstats) {
1734                         free_netdev(ndev);
1735                         return -ENOMEM;
1736                 }
1737
1738                 ndev->needed_headroom = local->tx_headroom +
1739                                         4*6 /* four MAC addresses */
1740                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1741                                         + 6 /* mesh */
1742                                         + 8 /* rfc1042/bridge tunnel */
1743                                         - ETH_HLEN /* ethernet hard_header_len */
1744                                         + IEEE80211_ENCRYPT_HEADROOM;
1745                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1746
1747                 ret = dev_alloc_name(ndev, ndev->name);
1748                 if (ret < 0) {
1749                         free_netdev(ndev);
1750                         return ret;
1751                 }
1752
1753                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1754                 if (params && is_valid_ether_addr(params->macaddr))
1755                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1756                 else
1757                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1758                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1759
1760                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1761                 sdata = netdev_priv(ndev);
1762                 ndev->ieee80211_ptr = &sdata->wdev;
1763                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1764                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1765
1766                 if (txq_size) {
1767                         txqi = netdev_priv(ndev) + size;
1768                         ieee80211_init_tx_queue(sdata, NULL, txqi, 0);
1769                 }
1770
1771                 sdata->dev = ndev;
1772         }
1773
1774         /* initialise type-independent data */
1775         sdata->wdev.wiphy = local->hw.wiphy;
1776         sdata->local = local;
1777
1778         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1779                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1780
1781         INIT_LIST_HEAD(&sdata->key_list);
1782
1783         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1784                           ieee80211_dfs_cac_timer_work);
1785         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1786                           ieee80211_delayed_tailroom_dec);
1787
1788         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1789                 struct ieee80211_supported_band *sband;
1790                 sband = local->hw.wiphy->bands[i];
1791                 sdata->rc_rateidx_mask[i] =
1792                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1793                 if (sband) {
1794                         __le16 cap;
1795                         u16 *vht_rate_mask;
1796
1797                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1798                                sband->ht_cap.mcs.rx_mask,
1799                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1800
1801                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1802                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1803                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1804                 } else {
1805                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1806                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1807                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1808                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1809                 }
1810         }
1811
1812         ieee80211_set_default_queues(sdata);
1813
1814         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1815         sdata->user_power_level = local->user_power_level;
1816
1817         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1818
1819         /* setup type-dependent data */
1820         ieee80211_setup_sdata(sdata, type);
1821
1822         if (ndev) {
1823                 if (params) {
1824                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1825                         if (type == NL80211_IFTYPE_STATION)
1826                                 sdata->u.mgd.use_4addr = params->use_4addr;
1827                 }
1828
1829                 ndev->features |= local->hw.netdev_features;
1830
1831                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1832
1833                 ret = register_netdevice(ndev);
1834                 if (ret) {
1835                         free_netdev(ndev);
1836                         return ret;
1837                 }
1838         }
1839
1840         mutex_lock(&local->iflist_mtx);
1841         list_add_tail_rcu(&sdata->list, &local->interfaces);
1842         mutex_unlock(&local->iflist_mtx);
1843
1844         if (new_wdev)
1845                 *new_wdev = &sdata->wdev;
1846
1847         return 0;
1848 }
1849
1850 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1851 {
1852         ASSERT_RTNL();
1853
1854         mutex_lock(&sdata->local->iflist_mtx);
1855         list_del_rcu(&sdata->list);
1856         mutex_unlock(&sdata->local->iflist_mtx);
1857
1858         synchronize_rcu();
1859
1860         if (sdata->dev) {
1861                 unregister_netdevice(sdata->dev);
1862         } else {
1863                 cfg80211_unregister_wdev(&sdata->wdev);
1864                 kfree(sdata);
1865         }
1866 }
1867
1868 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1869 {
1870         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1871                 return;
1872         ieee80211_do_stop(sdata, true);
1873         ieee80211_teardown_sdata(sdata);
1874 }
1875
1876 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1877 {
1878         struct ieee80211_sub_if_data *sdata, *tmp;
1879         LIST_HEAD(unreg_list);
1880         LIST_HEAD(wdev_list);
1881
1882         ASSERT_RTNL();
1883
1884         /* Before destroying the interfaces, make sure they're all stopped so
1885          * that the hardware is stopped. Otherwise, the driver might still be
1886          * iterating the interfaces during the shutdown, e.g. from a worker
1887          * or from RX processing or similar, and if it does so (using atomic
1888          * iteration) while we're manipulating the list, the iteration will
1889          * crash.
1890          *
1891          * After this, the hardware should be stopped and the driver should
1892          * have stopped all of its activities, so that we can do RCU-unaware
1893          * manipulations of the interface list below.
1894          */
1895         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1896
1897         WARN(local->open_count, "%s: open count remains %d\n",
1898              wiphy_name(local->hw.wiphy), local->open_count);
1899
1900         mutex_lock(&local->iflist_mtx);
1901         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1902                 list_del(&sdata->list);
1903
1904                 if (sdata->dev)
1905                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1906                 else
1907                         list_add(&sdata->list, &wdev_list);
1908         }
1909         mutex_unlock(&local->iflist_mtx);
1910         unregister_netdevice_many(&unreg_list);
1911
1912         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1913                 list_del(&sdata->list);
1914                 cfg80211_unregister_wdev(&sdata->wdev);
1915                 kfree(sdata);
1916         }
1917 }
1918
1919 static int netdev_notify(struct notifier_block *nb,
1920                          unsigned long state, void *ptr)
1921 {
1922         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1923         struct ieee80211_sub_if_data *sdata;
1924
1925         if (state != NETDEV_CHANGENAME)
1926                 return NOTIFY_DONE;
1927
1928         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1929                 return NOTIFY_DONE;
1930
1931         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1932                 return NOTIFY_DONE;
1933
1934         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1935         memcpy(sdata->name, dev->name, IFNAMSIZ);
1936         ieee80211_debugfs_rename_netdev(sdata);
1937
1938         return NOTIFY_OK;
1939 }
1940
1941 static struct notifier_block mac80211_netdev_notifier = {
1942         .notifier_call = netdev_notify,
1943 };
1944
1945 int ieee80211_iface_init(void)
1946 {
1947         return register_netdevice_notifier(&mac80211_netdev_notifier);
1948 }
1949
1950 void ieee80211_iface_exit(void)
1951 {
1952         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1953 }