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  * Copyright (c) 2016        Intel Deutschland GmbH
  10  *
  11  * This program is free software; you can redistribute it and/or modify
  12  * it under the terms of the GNU General Public License version 2 as
  13  * published by the Free Software Foundation.
  14  */
  15 #include <linux/slab.h>
  16 #include <linux/kernel.h>
  17 #include <linux/if_arp.h>
  18 #include <linux/netdevice.h>
  19 #include <linux/rtnetlink.h>
  20 #include <net/mac80211.h>
  21 #include <net/ieee80211_radiotap.h>
  22 #include "ieee80211_i.h"
  23 #include "sta_info.h"
  24 #include "debugfs_netdev.h"
  25 #include "mesh.h"
  26 #include "led.h"
  27 #include "driver-ops.h"
  28 #include "wme.h"
  29 #include "rate.h"
  30
  31 /**
  32  * DOC: Interface list locking
  33  *
  34  * The interface list in each struct ieee80211_local is protected
  35  * three-fold:
  36  *
  37  * (1) modifications may only be done under the RTNL
  38  * (2) modifications and readers are protected against each other by
  39  *     the iflist_mtx.
  40  * (3) modifications are done in an RCU manner so atomic readers
  41  *     can traverse the list in RCU-safe blocks.
  42  *
  43  * As a consequence, reads (traversals) of the list can be protected
  44  * by either the RTNL, the iflist_mtx or RCU.
  45  */
  46
  47 static void ieee80211_iface_work(struct work_struct *work);
  48
  49 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  50 {
  51         struct ieee80211_chanctx_conf *chanctx_conf;
  52         int power;
  53
  54         rcu_read_lock();
  55         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  56         if (!chanctx_conf) {
  57                 rcu_read_unlock();
  58                 return false;
  59         }
  60
  61         power = ieee80211_chandef_max_power(&chanctx_conf->def);
  62         rcu_read_unlock();
  63
  64         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  65                 power = min(power, sdata->user_power_level);
  66
  67         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  68                 power = min(power, sdata->ap_power_level);
  69
  70         if (power != sdata->vif.bss_conf.txpower) {
  71                 sdata->vif.bss_conf.txpower = power;
  72                 ieee80211_hw_config(sdata->local, 0);
  73                 return true;
  74         }
  75
  76         return false;
  77 }
  78
  79 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
  80                               bool update_bss)
  81 {
  82         if (__ieee80211_recalc_txpower(sdata) ||
  83             (update_bss && ieee80211_sdata_running(sdata)))
  84                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  85 }
  86
  87 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
  88 {
  89         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  90                 return 0;
  91
  92         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  93         return IEEE80211_CONF_CHANGE_IDLE;
  94 }
  95
  96 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  97 {
  98         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  99                 return 0;
 100
 101         ieee80211_flush_queues(local, NULL, false);
 102
 103         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 104         return IEEE80211_CONF_CHANGE_IDLE;
 105 }
 106
 107 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
 108                                    bool force_active)
 109 {
 110         bool working, scanning, active;
 111         unsigned int led_trig_start = 0, led_trig_stop = 0;
 112
 113         lockdep_assert_held(&local->mtx);
 114
 115         active = force_active ||
 116                  !list_empty(&local->chanctx_list) ||
 117                  local->monitors;
 118
 119         working = !local->ops->remain_on_channel &&
 120                   !list_empty(&local->roc_list);
 121
 122         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 123                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 124
 125         if (working || scanning)
 126                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 127         else
 128                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 129
 130         if (active)
 131                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 132         else
 133                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 134
 135         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 136
 137         if (working || scanning || active)
 138                 return __ieee80211_idle_off(local);
 139         return __ieee80211_idle_on(local);
 140 }
 141
 142 u32 ieee80211_idle_off(struct ieee80211_local *local)
 143 {
 144         return __ieee80211_recalc_idle(local, true);
 145 }
 146
 147 void ieee80211_recalc_idle(struct ieee80211_local *local)
 148 {
 149         u32 change = __ieee80211_recalc_idle(local, false);
 150         if (change)
 151                 ieee80211_hw_config(local, change);
 152 }
 153
 154 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 155                                 bool check_dup)
 156 {
 157         struct ieee80211_local *local = sdata->local;
 158         struct ieee80211_sub_if_data *iter;
 159         u64 new, mask, tmp;
 160         u8 *m;
 161         int ret = 0;
 162
 163         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 164                 return 0;
 165
 166         m = addr;
 167         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 168                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 169                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 170
 171         m = local->hw.wiphy->addr_mask;
 172         mask =  ((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         if (!check_dup)
 177                 return ret;
 178
 179         mutex_lock(&local->iflist_mtx);
 180         list_for_each_entry(iter, &local->interfaces, list) {
 181                 if (iter == sdata)
 182                         continue;
 183
 184                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 185                     !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 186                         continue;
 187
 188                 m = iter->vif.addr;
 189                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 190                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 191                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 192
 193                 if ((new & ~mask) != (tmp & ~mask)) {
 194                         ret = -EINVAL;
 195                         break;
 196                 }
 197         }
 198         mutex_unlock(&local->iflist_mtx);
 199
 200         return ret;
 201 }
 202
 203 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 204 {
 205         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 206         struct sockaddr *sa = addr;
 207         bool check_dup = true;
 208         int ret;
 209
 210         if (ieee80211_sdata_running(sdata))
 211                 return -EBUSY;
 212
 213         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 214             !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 215                 check_dup = false;
 216
 217         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 218         if (ret)
 219                 return ret;
 220
 221         ret = eth_mac_addr(dev, sa);
 222
 223         if (ret == 0)
 224                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 225
 226         return ret;
 227 }
 228
 229 static inline int identical_mac_addr_allowed(int type1, int type2)
 230 {
 231         return type1 == NL80211_IFTYPE_MONITOR ||
 232                 type2 == NL80211_IFTYPE_MONITOR ||
 233                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 234                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 235                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 236                 (type1 == NL80211_IFTYPE_WDS &&
 237                         (type2 == NL80211_IFTYPE_WDS ||
 238                          type2 == NL80211_IFTYPE_AP)) ||
 239                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 240                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 241                         (type2 == NL80211_IFTYPE_AP ||
 242                          type2 == NL80211_IFTYPE_AP_VLAN));
 243 }
 244
 245 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 246                                             enum nl80211_iftype iftype)
 247 {
 248         struct ieee80211_local *local = sdata->local;
 249         struct ieee80211_sub_if_data *nsdata;
 250         int ret;
 251
 252         ASSERT_RTNL();
 253
 254         /* we hold the RTNL here so can safely walk the list */
 255         list_for_each_entry(nsdata, &local->interfaces, list) {
 256                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 257                         /*
 258                          * Only OCB and monitor mode may coexist
 259                          */
 260                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
 261                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
 262                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 263                              nsdata->vif.type == NL80211_IFTYPE_OCB))
 264                                 return -EBUSY;
 265
 266                         /*
 267                          * Allow only a single IBSS interface to be up at any
 268                          * time. This is restricted because beacon distribution
 269                          * cannot work properly if both are in the same IBSS.
 270                          *
 271                          * To remove this restriction we'd have to disallow them
 272                          * from setting the same SSID on different IBSS interfaces
 273                          * belonging to the same hardware. Then, however, we're
 274                          * faced with having to adopt two different TSF timers...
 275                          */
 276                         if (iftype == NL80211_IFTYPE_ADHOC &&
 277                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 278                                 return -EBUSY;
 279                         /*
 280                          * will not add another interface while any channel
 281                          * switch is active.
 282                          */
 283                         if (nsdata->vif.csa_active)
 284                                 return -EBUSY;
 285
 286                         /*
 287                          * The remaining checks are only performed for interfaces
 288                          * with the same MAC address.
 289                          */
 290                         if (!ether_addr_equal(sdata->vif.addr,
 291                                               nsdata->vif.addr))
 292                                 continue;
 293
 294                         /*
 295                          * check whether it may have the same address
 296                          */
 297                         if (!identical_mac_addr_allowed(iftype,
 298                                                         nsdata->vif.type))
 299                                 return -ENOTUNIQ;
 300
 301                         /*
 302                          * can only add VLANs to enabled APs
 303                          */
 304                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 305                             nsdata->vif.type == NL80211_IFTYPE_AP)
 306                                 sdata->bss = &nsdata->u.ap;
 307                 }
 308         }
 309
 310         mutex_lock(&local->chanctx_mtx);
 311         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
 312         mutex_unlock(&local->chanctx_mtx);
 313         return ret;
 314 }
 315
 316 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 317                                   enum nl80211_iftype iftype)
 318 {
 319         int n_queues = sdata->local->hw.queues;
 320         int i;
 321
 322         if (iftype == NL80211_IFTYPE_NAN)
 323                 return 0;
 324
 325         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 326                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 327                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 328                                          IEEE80211_INVAL_HW_QUEUE))
 329                                 return -EINVAL;
 330                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 331                                          n_queues))
 332                                 return -EINVAL;
 333                 }
 334         }
 335
 336         if ((iftype != NL80211_IFTYPE_AP &&
 337              iftype != NL80211_IFTYPE_P2P_GO &&
 338              iftype != NL80211_IFTYPE_MESH_POINT) ||
 339             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
 340                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 341                 return 0;
 342         }
 343
 344         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 345                 return -EINVAL;
 346
 347         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 348                 return -EINVAL;
 349
 350         return 0;
 351 }
 352
 353 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 354                                     const int offset)
 355 {
 356         struct ieee80211_local *local = sdata->local;
 357         u32 flags = sdata->u.mntr.flags;
 358
 359 #define ADJUST(_f, _s)  do {                                    \
 360         if (flags & MONITOR_FLAG_##_f)                          \
 361                 local->fif_##_s += offset;                      \
 362         } while (0)
 363
 364         ADJUST(FCSFAIL, fcsfail);
 365         ADJUST(PLCPFAIL, plcpfail);
 366         ADJUST(CONTROL, control);
 367         ADJUST(CONTROL, pspoll);
 368         ADJUST(OTHER_BSS, other_bss);
 369
 370 #undef ADJUST
 371 }
 372
 373 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 374 {
 375         struct ieee80211_local *local = sdata->local;
 376         int i;
 377
 378         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 379                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
 380                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 381                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 382                         sdata->vif.hw_queue[i] = i;
 383                 else
 384                         sdata->vif.hw_queue[i] = 0;
 385         }
 386         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 387 }
 388
 389 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 390 {
 391         struct ieee80211_sub_if_data *sdata;
 392         int ret;
 393
 394         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 395                 return 0;
 396
 397         ASSERT_RTNL();
 398
 399         if (local->monitor_sdata)
 400                 return 0;
 401
 402         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 403         if (!sdata)
 404                 return -ENOMEM;
 405
 406         /* set up data */
 407         sdata->local = local;
 408         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 409         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 410                  wiphy_name(local->hw.wiphy));
 411         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
 412
 413         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 414
 415         ieee80211_set_default_queues(sdata);
 416
 417         ret = drv_add_interface(local, sdata);
 418         if (WARN_ON(ret)) {
 419                 /* ok .. stupid driver, it asked for this! */
 420                 kfree(sdata);
 421                 return ret;
 422         }
 423
 424         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 425         if (ret) {
 426                 kfree(sdata);
 427                 return ret;
 428         }
 429
 430         mutex_lock(&local->iflist_mtx);
 431         rcu_assign_pointer(local->monitor_sdata, sdata);
 432         mutex_unlock(&local->iflist_mtx);
 433
 434         mutex_lock(&local->mtx);
 435         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 436                                         IEEE80211_CHANCTX_EXCLUSIVE);
 437         mutex_unlock(&local->mtx);
 438         if (ret) {
 439                 mutex_lock(&local->iflist_mtx);
 440                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
 441                 mutex_unlock(&local->iflist_mtx);
 442                 synchronize_net();
 443                 drv_remove_interface(local, sdata);
 444                 kfree(sdata);
 445                 return ret;
 446         }
 447
 448         skb_queue_head_init(&sdata->skb_queue);
 449         INIT_WORK(&sdata->work, ieee80211_iface_work);
 450
 451         return 0;
 452 }
 453
 454 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 455 {
 456         struct ieee80211_sub_if_data *sdata;
 457
 458         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 459                 return;
 460
 461         ASSERT_RTNL();
 462
 463         mutex_lock(&local->iflist_mtx);
 464
 465         sdata = rcu_dereference_protected(local->monitor_sdata,
 466                                           lockdep_is_held(&local->iflist_mtx));
 467         if (!sdata) {
 468                 mutex_unlock(&local->iflist_mtx);
 469                 return;
 470         }
 471
 472         RCU_INIT_POINTER(local->monitor_sdata, NULL);
 473         mutex_unlock(&local->iflist_mtx);
 474
 475         synchronize_net();
 476
 477         mutex_lock(&local->mtx);
 478         ieee80211_vif_release_channel(sdata);
 479         mutex_unlock(&local->mtx);
 480
 481         drv_remove_interface(local, sdata);
 482
 483         kfree(sdata);
 484 }
 485
 486 /*
 487  * NOTE: Be very careful when changing this function, it must NOT return
 488  * an error on interface type changes that have been pre-checked, so most
 489  * checks should be in ieee80211_check_concurrent_iface.
 490  */
 491 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 492 {
 493         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 494         struct net_device *dev = wdev->netdev;
 495         struct ieee80211_local *local = sdata->local;
 496         struct sta_info *sta;
 497         u32 changed = 0;
 498         int res;
 499         u32 hw_reconf_flags = 0;
 500
 501         switch (sdata->vif.type) {
 502         case NL80211_IFTYPE_WDS:
 503                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 504                         return -ENOLINK;
 505                 break;
 506         case NL80211_IFTYPE_AP_VLAN: {
 507                 struct ieee80211_sub_if_data *master;
 508
 509                 if (!sdata->bss)
 510                         return -ENOLINK;
 511
 512                 mutex_lock(&local->mtx);
 513                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 514                 mutex_unlock(&local->mtx);
 515
 516                 master = container_of(sdata->bss,
 517                                       struct ieee80211_sub_if_data, u.ap);
 518                 sdata->control_port_protocol =
 519                         master->control_port_protocol;
 520                 sdata->control_port_no_encrypt =
 521                         master->control_port_no_encrypt;
 522                 sdata->vif.cab_queue = master->vif.cab_queue;
 523                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
 524                        sizeof(sdata->vif.hw_queue));
 525                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
 526
 527                 mutex_lock(&local->key_mtx);
 528                 sdata->crypto_tx_tailroom_needed_cnt +=
 529                         master->crypto_tx_tailroom_needed_cnt;
 530                 mutex_unlock(&local->key_mtx);
 531
 532                 break;
 533                 }
 534         case NL80211_IFTYPE_AP:
 535                 sdata->bss = &sdata->u.ap;
 536                 break;
 537         case NL80211_IFTYPE_MESH_POINT:
 538         case NL80211_IFTYPE_STATION:
 539         case NL80211_IFTYPE_MONITOR:
 540         case NL80211_IFTYPE_ADHOC:
 541         case NL80211_IFTYPE_P2P_DEVICE:
 542         case NL80211_IFTYPE_OCB:
 543         case NL80211_IFTYPE_NAN:
 544                 /* no special treatment */
 545                 break;
 546         case NL80211_IFTYPE_UNSPECIFIED:
 547         case NUM_NL80211_IFTYPES:
 548         case NL80211_IFTYPE_P2P_CLIENT:
 549         case NL80211_IFTYPE_P2P_GO:
 550                 /* cannot happen */
 551                 WARN_ON(1);
 552                 break;
 553         }
 554
 555         if (local->open_count == 0) {
 556                 res = drv_start(local);
 557                 if (res)
 558                         goto err_del_bss;
 559                 /* we're brought up, everything changes */
 560                 hw_reconf_flags = ~0;
 561                 ieee80211_led_radio(local, true);
 562                 ieee80211_mod_tpt_led_trig(local,
 563                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 564         }
 565
 566         /*
 567          * Copy the hopefully now-present MAC address to
 568          * this interface, if it has the special null one.
 569          */
 570         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 571                 memcpy(dev->dev_addr,
 572                        local->hw.wiphy->perm_addr,
 573                        ETH_ALEN);
 574                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 575
 576                 if (!is_valid_ether_addr(dev->dev_addr)) {
 577                         res = -EADDRNOTAVAIL;
 578                         goto err_stop;
 579                 }
 580         }
 581
 582         switch (sdata->vif.type) {
 583         case NL80211_IFTYPE_AP_VLAN:
 584                 /* no need to tell driver, but set carrier and chanctx */
 585                 if (rtnl_dereference(sdata->bss->beacon)) {
 586                         ieee80211_vif_vlan_copy_chanctx(sdata);
 587                         netif_carrier_on(dev);
 588                 } else {
 589                         netif_carrier_off(dev);
 590                 }
 591                 break;
 592         case NL80211_IFTYPE_MONITOR:
 593                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 594                         local->cooked_mntrs++;
 595                         break;
 596                 }
 597
 598                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
 599                         res = drv_add_interface(local, sdata);
 600                         if (res)
 601                                 goto err_stop;
 602                 } else if (local->monitors == 0 && local->open_count == 0) {
 603                         res = ieee80211_add_virtual_monitor(local);
 604                         if (res)
 605                                 goto err_stop;
 606                 }
 607
 608                 /* must be before the call to ieee80211_configure_filter */
 609                 local->monitors++;
 610                 if (local->monitors == 1) {
 611                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 612                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 613                 }
 614
 615                 ieee80211_adjust_monitor_flags(sdata, 1);
 616                 ieee80211_configure_filter(local);
 617                 mutex_lock(&local->mtx);
 618                 ieee80211_recalc_idle(local);
 619                 mutex_unlock(&local->mtx);
 620
 621                 netif_carrier_on(dev);
 622                 break;
 623         default:
 624                 if (coming_up) {
 625                         ieee80211_del_virtual_monitor(local);
 626
 627                         res = drv_add_interface(local, sdata);
 628                         if (res)
 629                                 goto err_stop;
 630                         res = ieee80211_check_queues(sdata,
 631                                 ieee80211_vif_type_p2p(&sdata->vif));
 632                         if (res)
 633                                 goto err_del_interface;
 634                 }
 635
 636                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 637                         local->fif_pspoll++;
 638                         local->fif_probe_req++;
 639
 640                         ieee80211_configure_filter(local);
 641                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 642                         local->fif_probe_req++;
 643                 }
 644
 645                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
 646                     sdata->vif.type != NL80211_IFTYPE_NAN)
 647                         changed |= ieee80211_reset_erp_info(sdata);
 648                 ieee80211_bss_info_change_notify(sdata, changed);
 649
 650                 switch (sdata->vif.type) {
 651                 case NL80211_IFTYPE_STATION:
 652                 case NL80211_IFTYPE_ADHOC:
 653                 case NL80211_IFTYPE_AP:
 654                 case NL80211_IFTYPE_MESH_POINT:
 655                 case NL80211_IFTYPE_OCB:
 656                         netif_carrier_off(dev);
 657                         break;
 658                 case NL80211_IFTYPE_WDS:
 659                 case NL80211_IFTYPE_P2P_DEVICE:
 660                 case NL80211_IFTYPE_NAN:
 661                         break;
 662                 default:
 663                         /* not reached */
 664                         WARN_ON(1);
 665                 }
 666
 667                 /*
 668                  * Set default queue parameters so drivers don't
 669                  * need to initialise the hardware if the hardware
 670                  * doesn't start up with sane defaults.
 671                  * Enable QoS for anything but station interfaces.
 672                  */
 673                 ieee80211_set_wmm_default(sdata, true,
 674                         sdata->vif.type != NL80211_IFTYPE_STATION);
 675         }
 676
 677         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 678
 679         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 680                 /* Create STA entry for the WDS peer */
 681                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 682                                      GFP_KERNEL);
 683                 if (!sta) {
 684                         res = -ENOMEM;
 685                         goto err_del_interface;
 686                 }
 687
 688                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 689                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 690                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 691
 692                 res = sta_info_insert(sta);
 693                 if (res) {
 694                         /* STA has been freed */
 695                         goto err_del_interface;
 696                 }
 697
 698                 rate_control_rate_init(sta);
 699                 netif_carrier_on(dev);
 700         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 701                 rcu_assign_pointer(local->p2p_sdata, sdata);
 702         }
 703
 704         /*
 705          * set_multicast_list will be invoked by the networking core
 706          * which will check whether any increments here were done in
 707          * error and sync them down to the hardware as filter flags.
 708          */
 709         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 710                 atomic_inc(&local->iff_allmultis);
 711
 712         if (coming_up)
 713                 local->open_count++;
 714
 715         if (hw_reconf_flags)
 716                 ieee80211_hw_config(local, hw_reconf_flags);
 717
 718         ieee80211_recalc_ps(local);
 719
 720         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 721             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 722                 /* XXX: for AP_VLAN, actually track AP queues */
 723                 netif_tx_start_all_queues(dev);
 724         } else if (dev) {
 725                 unsigned long flags;
 726                 int n_acs = IEEE80211_NUM_ACS;
 727                 int ac;
 728
 729                 if (local->hw.queues < IEEE80211_NUM_ACS)
 730                         n_acs = 1;
 731
 732                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 733                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 734                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 735                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 736                         for (ac = 0; ac < n_acs; ac++) {
 737                                 int ac_queue = sdata->vif.hw_queue[ac];
 738
 739                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 740                                     skb_queue_empty(&local->pending[ac_queue]))
 741                                         netif_start_subqueue(dev, ac);
 742                         }
 743                 }
 744                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 745         }
 746
 747         return 0;
 748  err_del_interface:
 749         drv_remove_interface(local, sdata);
 750  err_stop:
 751         if (!local->open_count)
 752                 drv_stop(local);
 753  err_del_bss:
 754         sdata->bss = NULL;
 755         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 756                 mutex_lock(&local->mtx);
 757                 list_del(&sdata->u.vlan.list);
 758                 mutex_unlock(&local->mtx);
 759         }
 760         /* might already be clear but that doesn't matter */
 761         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 762         return res;
 763 }
 764
 765 static int ieee80211_open(struct net_device *dev)
 766 {
 767         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 768         int err;
 769
 770         /* fail early if user set an invalid address */
 771         if (!is_valid_ether_addr(dev->dev_addr))
 772                 return -EADDRNOTAVAIL;
 773
 774         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 775         if (err)
 776                 return err;
 777
 778         return ieee80211_do_open(&sdata->wdev, true);
 779 }
 780
 781 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 782                               bool going_down)
 783 {
 784         struct ieee80211_local *local = sdata->local;
 785         struct fq *fq = &local->fq;
 786         unsigned long flags;
 787         struct sk_buff *skb, *tmp;
 788         u32 hw_reconf_flags = 0;
 789         int i, flushed;
 790         struct ps_data *ps;
 791         struct cfg80211_chan_def chandef;
 792         bool cancel_scan;
 793         struct cfg80211_nan_func *func;
 794
 795         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 796
 797         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 798         if (cancel_scan)
 799                 ieee80211_scan_cancel(local);
 800
 801         /*
 802          * Stop TX on this interface first.
 803          */
 804         if (sdata->dev)
 805                 netif_tx_stop_all_queues(sdata->dev);
 806
 807         ieee80211_roc_purge(local, sdata);
 808
 809         switch (sdata->vif.type) {
 810         case NL80211_IFTYPE_STATION:
 811                 ieee80211_mgd_stop(sdata);
 812                 break;
 813         case NL80211_IFTYPE_ADHOC:
 814                 ieee80211_ibss_stop(sdata);
 815                 break;
 816         case NL80211_IFTYPE_AP:
 817                 cancel_work_sync(&sdata->u.ap.request_smps_work);
 818                 break;
 819         default:
 820                 break;
 821         }
 822
 823         /*
 824          * Remove all stations associated with this interface.
 825          *
 826          * This must be done before calling ops->remove_interface()
 827          * because otherwise we can later invoke ops->sta_notify()
 828          * whenever the STAs are removed, and that invalidates driver
 829          * assumptions about always getting a vif pointer that is valid
 830          * (because if we remove a STA after ops->remove_interface()
 831          * the driver will have removed the vif info already!)
 832          *
 833          * In WDS mode a station must exist here and be flushed, for
 834          * AP_VLANs stations may exist since there's nothing else that
 835          * would have removed them, but in other modes there shouldn't
 836          * be any stations.
 837          */
 838         flushed = sta_info_flush(sdata);
 839         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
 840                      ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 841                       (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
 842
 843         /* don't count this interface for allmulti while it is down */
 844         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 845                 atomic_dec(&local->iff_allmultis);
 846
 847         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 848                 local->fif_pspoll--;
 849                 local->fif_probe_req--;
 850         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 851                 local->fif_probe_req--;
 852         }
 853
 854         if (sdata->dev) {
 855                 netif_addr_lock_bh(sdata->dev);
 856                 spin_lock_bh(&local->filter_lock);
 857                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 858                                  sdata->dev->addr_len);
 859                 spin_unlock_bh(&local->filter_lock);
 860                 netif_addr_unlock_bh(sdata->dev);
 861         }
 862
 863         del_timer_sync(&local->dynamic_ps_timer);
 864         cancel_work_sync(&local->dynamic_ps_enable_work);
 865
 866         cancel_work_sync(&sdata->recalc_smps);
 867         sdata_lock(sdata);
 868         mutex_lock(&local->mtx);
 869         sdata->vif.csa_active = false;
 870         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 871                 sdata->u.mgd.csa_waiting_bcn = false;
 872         if (sdata->csa_block_tx) {
 873                 ieee80211_wake_vif_queues(local, sdata,
 874                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 875                 sdata->csa_block_tx = false;
 876         }
 877         mutex_unlock(&local->mtx);
 878         sdata_unlock(sdata);
 879
 880         cancel_work_sync(&sdata->csa_finalize_work);
 881
 882         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 883
 884         if (sdata->wdev.cac_started) {
 885                 chandef = sdata->vif.bss_conf.chandef;
 886                 WARN_ON(local->suspended);
 887                 mutex_lock(&local->mtx);
 888                 ieee80211_vif_release_channel(sdata);
 889                 mutex_unlock(&local->mtx);
 890                 cfg80211_cac_event(sdata->dev, &chandef,
 891                                    NL80211_RADAR_CAC_ABORTED,
 892                                    GFP_KERNEL);
 893         }
 894
 895         /* APs need special treatment */
 896         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 897                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 898
 899                 /* down all dependent devices, that is VLANs */
 900                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 901                                          u.vlan.list)
 902                         dev_close(vlan->dev);
 903                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 904         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 905                 /* remove all packets in parent bc_buf pointing to this dev */
 906                 ps = &sdata->bss->ps;
 907
 908                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 909                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 910                         if (skb->dev == sdata->dev) {
 911                                 __skb_unlink(skb, &ps->bc_buf);
 912                                 local->total_ps_buffered--;
 913                                 ieee80211_free_txskb(&local->hw, skb);
 914                         }
 915                 }
 916                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 917         }
 918
 919         if (going_down)
 920                 local->open_count--;
 921
 922         switch (sdata->vif.type) {
 923         case NL80211_IFTYPE_AP_VLAN:
 924                 mutex_lock(&local->mtx);
 925                 list_del(&sdata->u.vlan.list);
 926                 mutex_unlock(&local->mtx);
 927                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 928                 /* see comment in the default case below */
 929                 ieee80211_free_keys(sdata, true);
 930                 /* no need to tell driver */
 931                 break;
 932         case NL80211_IFTYPE_MONITOR:
 933                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 934                         local->cooked_mntrs--;
 935                         break;
 936                 }
 937
 938                 local->monitors--;
 939                 if (local->monitors == 0) {
 940                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 941                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 942                 }
 943
 944                 ieee80211_adjust_monitor_flags(sdata, -1);
 945                 break;
 946         case NL80211_IFTYPE_NAN:
 947                 /* clean all the functions */
 948                 spin_lock_bh(&sdata->u.nan.func_lock);
 949
 950                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
 951                         idr_remove(&sdata->u.nan.function_inst_ids, i);
 952                         cfg80211_free_nan_func(func);
 953                 }
 954                 idr_destroy(&sdata->u.nan.function_inst_ids);
 955
 956                 spin_unlock_bh(&sdata->u.nan.func_lock);
 957                 break;
 958         case NL80211_IFTYPE_P2P_DEVICE:
 959                 /* relies on synchronize_rcu() below */
 960                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 961                 /* fall through */
 962         default:
 963                 cancel_work_sync(&sdata->work);
 964                 /*
 965                  * When we get here, the interface is marked down.
 966                  * Free the remaining keys, if there are any
 967                  * (which can happen in AP mode if userspace sets
 968                  * keys before the interface is operating, and maybe
 969                  * also in WDS mode)
 970                  *
 971                  * Force the key freeing to always synchronize_net()
 972                  * to wait for the RX path in case it is using this
 973                  * interface enqueuing frames at this very time on
 974                  * another CPU.
 975                  */
 976                 ieee80211_free_keys(sdata, true);
 977                 skb_queue_purge(&sdata->skb_queue);
 978         }
 979
 980         sdata->bss = NULL;
 981
 982         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 983         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 984                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 985                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 986                         if (info->control.vif == &sdata->vif) {
 987                                 __skb_unlink(skb, &local->pending[i]);
 988                                 ieee80211_free_txskb(&local->hw, skb);
 989                         }
 990                 }
 991         }
 992         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 993
 994         if (sdata->vif.txq) {
 995                 struct txq_info *txqi = to_txq_info(sdata->vif.txq);
 996
 997                 spin_lock_bh(&fq->lock);
 998                 ieee80211_txq_purge(local, txqi);
 999                 spin_unlock_bh(&fq->lock);
1000         }
1001
1002         if (local->open_count == 0)
1003                 ieee80211_clear_tx_pending(local);
1004
1005         /*
1006          * If the interface goes down while suspended, presumably because
1007          * the device was unplugged and that happens before our resume,
1008          * then the driver is already unconfigured and the remainder of
1009          * this function isn't needed.
1010          * XXX: what about WoWLAN? If the device has software state, e.g.
1011          *      memory allocated, it might expect teardown commands from
1012          *      mac80211 here?
1013          */
1014         if (local->suspended) {
1015                 WARN_ON(local->wowlan);
1016                 WARN_ON(rtnl_dereference(local->monitor_sdata));
1017                 return;
1018         }
1019
1020         switch (sdata->vif.type) {
1021         case NL80211_IFTYPE_AP_VLAN:
1022                 break;
1023         case NL80211_IFTYPE_MONITOR:
1024                 if (local->monitors == 0)
1025                         ieee80211_del_virtual_monitor(local);
1026
1027                 mutex_lock(&local->mtx);
1028                 ieee80211_recalc_idle(local);
1029                 mutex_unlock(&local->mtx);
1030
1031                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1032                         break;
1033
1034                 /* fall through */
1035         default:
1036                 if (going_down)
1037                         drv_remove_interface(local, sdata);
1038         }
1039
1040         ieee80211_recalc_ps(local);
1041
1042         if (cancel_scan)
1043                 flush_delayed_work(&local->scan_work);
1044
1045         if (local->open_count == 0) {
1046                 ieee80211_stop_device(local);
1047
1048                 /* no reconfiguring after stop! */
1049                 return;
1050         }
1051
1052         /* do after stop to avoid reconfiguring when we stop anyway */
1053         ieee80211_configure_filter(local);
1054         ieee80211_hw_config(local, hw_reconf_flags);
1055
1056         if (local->monitors == local->open_count)
1057                 ieee80211_add_virtual_monitor(local);
1058 }
1059
1060 static int ieee80211_stop(struct net_device *dev)
1061 {
1062         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1063
1064         ieee80211_do_stop(sdata, true);
1065
1066         return 0;
1067 }
1068
1069 static void ieee80211_set_multicast_list(struct net_device *dev)
1070 {
1071         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1072         struct ieee80211_local *local = sdata->local;
1073         int allmulti, sdata_allmulti;
1074
1075         allmulti = !!(dev->flags & IFF_ALLMULTI);
1076         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1077
1078         if (allmulti != sdata_allmulti) {
1079                 if (dev->flags & IFF_ALLMULTI)
1080                         atomic_inc(&local->iff_allmultis);
1081                 else
1082                         atomic_dec(&local->iff_allmultis);
1083                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1084         }
1085
1086         spin_lock_bh(&local->filter_lock);
1087         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1088         spin_unlock_bh(&local->filter_lock);
1089         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1090 }
1091
1092 /*
1093  * Called when the netdev is removed or, by the code below, before
1094  * the interface type changes.
1095  */
1096 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1097 {
1098         int i;
1099
1100         /* free extra data */
1101         ieee80211_free_keys(sdata, false);
1102
1103         ieee80211_debugfs_remove_netdev(sdata);
1104
1105         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1106                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1107         sdata->fragment_next = 0;
1108
1109         if (ieee80211_vif_is_mesh(&sdata->vif))
1110                 ieee80211_mesh_teardown_sdata(sdata);
1111 }
1112
1113 static void ieee80211_uninit(struct net_device *dev)
1114 {
1115         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1116 }
1117
1118 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1119                                          struct sk_buff *skb,
1120                                          void *accel_priv,
1121                                          select_queue_fallback_t fallback)
1122 {
1123         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1124 }
1125
1126 static void
1127 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1128 {
1129         int i;
1130
1131         for_each_possible_cpu(i) {
1132                 const struct pcpu_sw_netstats *tstats;
1133                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1134                 unsigned int start;
1135
1136                 tstats = per_cpu_ptr(dev->tstats, i);
1137
1138                 do {
1139                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
1140                         rx_packets = tstats->rx_packets;
1141                         tx_packets = tstats->tx_packets;
1142                         rx_bytes = tstats->rx_bytes;
1143                         tx_bytes = tstats->tx_bytes;
1144                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1145
1146                 stats->rx_packets += rx_packets;
1147                 stats->tx_packets += tx_packets;
1148                 stats->rx_bytes   += rx_bytes;
1149                 stats->tx_bytes   += tx_bytes;
1150         }
1151 }
1152
1153 static const struct net_device_ops ieee80211_dataif_ops = {
1154         .ndo_open               = ieee80211_open,
1155         .ndo_stop               = ieee80211_stop,
1156         .ndo_uninit             = ieee80211_uninit,
1157         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1158         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1159         .ndo_set_mac_address    = ieee80211_change_mac,
1160         .ndo_select_queue       = ieee80211_netdev_select_queue,
1161         .ndo_get_stats64        = ieee80211_get_stats64,
1162 };
1163
1164 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1165                                           struct sk_buff *skb,
1166                                           void *accel_priv,
1167                                           select_queue_fallback_t fallback)
1168 {
1169         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1170         struct ieee80211_local *local = sdata->local;
1171         struct ieee80211_hdr *hdr;
1172         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1173
1174         if (local->hw.queues < IEEE80211_NUM_ACS)
1175                 return 0;
1176
1177         if (skb->len < 4 ||
1178             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1179                 return 0; /* doesn't matter, frame will be dropped */
1180
1181         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1182
1183         return ieee80211_select_queue_80211(sdata, skb, hdr);
1184 }
1185
1186 static const struct net_device_ops ieee80211_monitorif_ops = {
1187         .ndo_open               = ieee80211_open,
1188         .ndo_stop               = ieee80211_stop,
1189         .ndo_uninit             = ieee80211_uninit,
1190         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1191         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1192         .ndo_set_mac_address    = ieee80211_change_mac,
1193         .ndo_select_queue       = ieee80211_monitor_select_queue,
1194         .ndo_get_stats64        = ieee80211_get_stats64,
1195 };
1196
1197 static void ieee80211_if_free(struct net_device *dev)
1198 {
1199         free_percpu(dev->tstats);
1200         free_netdev(dev);
1201 }
1202
1203 static void ieee80211_if_setup(struct net_device *dev)
1204 {
1205         ether_setup(dev);
1206         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1207         dev->netdev_ops = &ieee80211_dataif_ops;
1208         dev->destructor = ieee80211_if_free;
1209 }
1210
1211 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1212 {
1213         ieee80211_if_setup(dev);
1214         dev->priv_flags |= IFF_NO_QUEUE;
1215 }
1216
1217 static void ieee80211_iface_work(struct work_struct *work)
1218 {
1219         struct ieee80211_sub_if_data *sdata =
1220                 container_of(work, struct ieee80211_sub_if_data, work);
1221         struct ieee80211_local *local = sdata->local;
1222         struct sk_buff *skb;
1223         struct sta_info *sta;
1224         struct ieee80211_ra_tid *ra_tid;
1225         struct ieee80211_rx_agg *rx_agg;
1226
1227         if (!ieee80211_sdata_running(sdata))
1228                 return;
1229
1230         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1231                 return;
1232
1233         if (!ieee80211_can_run_worker(local))
1234                 return;
1235
1236         /* first process frames */
1237         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1238                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1239
1240                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1241                         ra_tid = (void *)&skb->cb;
1242                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1243                                                  ra_tid->tid);
1244                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1245                         ra_tid = (void *)&skb->cb;
1246                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1247                                                 ra_tid->tid);
1248                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1249                         rx_agg = (void *)&skb->cb;
1250                         mutex_lock(&local->sta_mtx);
1251                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1252                         if (sta)
1253                                 __ieee80211_start_rx_ba_session(sta,
1254                                                 0, 0, 0, 1, rx_agg->tid,
1255                                                 IEEE80211_MAX_AMPDU_BUF,
1256                                                 false, true);
1257                         mutex_unlock(&local->sta_mtx);
1258                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1259                         rx_agg = (void *)&skb->cb;
1260                         mutex_lock(&local->sta_mtx);
1261                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1262                         if (sta)
1263                                 __ieee80211_stop_rx_ba_session(sta,
1264                                                         rx_agg->tid,
1265                                                         WLAN_BACK_RECIPIENT, 0,
1266                                                         false);
1267                         mutex_unlock(&local->sta_mtx);
1268                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1269                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1270                         int len = skb->len;
1271
1272                         mutex_lock(&local->sta_mtx);
1273                         sta = sta_info_get_bss(sdata, mgmt->sa);
1274                         if (sta) {
1275                                 switch (mgmt->u.action.u.addba_req.action_code) {
1276                                 case WLAN_ACTION_ADDBA_REQ:
1277                                         ieee80211_process_addba_request(
1278                                                         local, sta, mgmt, len);
1279                                         break;
1280                                 case WLAN_ACTION_ADDBA_RESP:
1281                                         ieee80211_process_addba_resp(local, sta,
1282                                                                      mgmt, len);
1283                                         break;
1284                                 case WLAN_ACTION_DELBA:
1285                                         ieee80211_process_delba(sdata, sta,
1286                                                                 mgmt, len);
1287                                         break;
1288                                 default:
1289                                         WARN_ON(1);
1290                                         break;
1291                                 }
1292                         }
1293                         mutex_unlock(&local->sta_mtx);
1294                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1295                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1296                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1297                         case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1298                                 struct ieee80211_rx_status *status;
1299                                 enum nl80211_band band;
1300                                 u8 opmode;
1301
1302                                 status = IEEE80211_SKB_RXCB(skb);
1303                                 band = status->band;
1304                                 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1305
1306                                 mutex_lock(&local->sta_mtx);
1307                                 sta = sta_info_get_bss(sdata, mgmt->sa);
1308
1309                                 if (sta)
1310                                         ieee80211_vht_handle_opmode(sdata, sta,
1311                                                                     opmode,
1312                                                                     band);
1313
1314                                 mutex_unlock(&local->sta_mtx);
1315                                 break;
1316                         }
1317                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1318                                 ieee80211_process_mu_groups(sdata, mgmt);
1319                                 break;
1320                         default:
1321                                 WARN_ON(1);
1322                                 break;
1323                         }
1324                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1325                         struct ieee80211_hdr *hdr = (void *)mgmt;
1326                         /*
1327                          * So the frame isn't mgmt, but frame_control
1328                          * is at the right place anyway, of course, so
1329                          * the if statement is correct.
1330                          *
1331                          * Warn if we have other data frame types here,
1332                          * they must not get here.
1333                          */
1334                         WARN_ON(hdr->frame_control &
1335                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1336                         WARN_ON(!(hdr->seq_ctrl &
1337                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1338                         /*
1339                          * This was a fragment of a frame, received while
1340                          * a block-ack session was active. That cannot be
1341                          * right, so terminate the session.
1342                          */
1343                         mutex_lock(&local->sta_mtx);
1344                         sta = sta_info_get_bss(sdata, mgmt->sa);
1345                         if (sta) {
1346                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1347                                                 IEEE80211_QOS_CTL_TID_MASK;
1348
1349                                 __ieee80211_stop_rx_ba_session(
1350                                         sta, tid, WLAN_BACK_RECIPIENT,
1351                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1352                                         true);
1353                         }
1354                         mutex_unlock(&local->sta_mtx);
1355                 } else switch (sdata->vif.type) {
1356                 case NL80211_IFTYPE_STATION:
1357                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1358                         break;
1359                 case NL80211_IFTYPE_ADHOC:
1360                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1361                         break;
1362                 case NL80211_IFTYPE_MESH_POINT:
1363                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1364                                 break;
1365                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1366                         break;
1367                 default:
1368                         WARN(1, "frame for unexpected interface type");
1369                         break;
1370                 }
1371
1372                 kfree_skb(skb);
1373         }
1374
1375         /* then other type-dependent work */
1376         switch (sdata->vif.type) {
1377         case NL80211_IFTYPE_STATION:
1378                 ieee80211_sta_work(sdata);
1379                 break;
1380         case NL80211_IFTYPE_ADHOC:
1381                 ieee80211_ibss_work(sdata);
1382                 break;
1383         case NL80211_IFTYPE_MESH_POINT:
1384                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1385                         break;
1386                 ieee80211_mesh_work(sdata);
1387                 break;
1388         case NL80211_IFTYPE_OCB:
1389                 ieee80211_ocb_work(sdata);
1390                 break;
1391         default:
1392                 break;
1393         }
1394 }
1395
1396 static void ieee80211_recalc_smps_work(struct work_struct *work)
1397 {
1398         struct ieee80211_sub_if_data *sdata =
1399                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1400
1401         ieee80211_recalc_smps(sdata);
1402 }
1403
1404 /*
1405  * Helper function to initialise an interface to a specific type.
1406  */
1407 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1408                                   enum nl80211_iftype type)
1409 {
1410         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1411                                                     0xff, 0xff, 0xff};
1412
1413         /* clear type-dependent union */
1414         memset(&sdata->u, 0, sizeof(sdata->u));
1415
1416         /* and set some type-dependent values */
1417         sdata->vif.type = type;
1418         sdata->vif.p2p = false;
1419         sdata->wdev.iftype = type;
1420
1421         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1422         sdata->control_port_no_encrypt = false;
1423         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1424         sdata->vif.bss_conf.idle = true;
1425
1426         sdata->noack_map = 0;
1427
1428         /* only monitor/p2p-device differ */
1429         if (sdata->dev) {
1430                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1431                 sdata->dev->type = ARPHRD_ETHER;
1432         }
1433
1434         skb_queue_head_init(&sdata->skb_queue);
1435         INIT_WORK(&sdata->work, ieee80211_iface_work);
1436         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1437         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1438         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1439         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1440
1441         switch (type) {
1442         case NL80211_IFTYPE_P2P_GO:
1443                 type = NL80211_IFTYPE_AP;
1444                 sdata->vif.type = type;
1445                 sdata->vif.p2p = true;
1446                 /* fall through */
1447         case NL80211_IFTYPE_AP:
1448                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1449                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1450                 INIT_WORK(&sdata->u.ap.request_smps_work,
1451                           ieee80211_request_smps_ap_work);
1452                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1453                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1454                 break;
1455         case NL80211_IFTYPE_P2P_CLIENT:
1456                 type = NL80211_IFTYPE_STATION;
1457                 sdata->vif.type = type;
1458                 sdata->vif.p2p = true;
1459                 /* fall through */
1460         case NL80211_IFTYPE_STATION:
1461                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1462                 ieee80211_sta_setup_sdata(sdata);
1463                 break;
1464         case NL80211_IFTYPE_OCB:
1465                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1466                 ieee80211_ocb_setup_sdata(sdata);
1467                 break;
1468         case NL80211_IFTYPE_ADHOC:
1469                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1470                 ieee80211_ibss_setup_sdata(sdata);
1471                 break;
1472         case NL80211_IFTYPE_MESH_POINT:
1473                 if (ieee80211_vif_is_mesh(&sdata->vif))
1474                         ieee80211_mesh_init_sdata(sdata);
1475                 break;
1476         case NL80211_IFTYPE_MONITOR:
1477                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1478                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1479                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1480                                       MONITOR_FLAG_OTHER_BSS;
1481                 break;
1482         case NL80211_IFTYPE_WDS:
1483                 sdata->vif.bss_conf.bssid = NULL;
1484                 break;
1485         case NL80211_IFTYPE_NAN:
1486                 idr_init(&sdata->u.nan.function_inst_ids);
1487                 spin_lock_init(&sdata->u.nan.func_lock);
1488                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1489                 break;
1490         case NL80211_IFTYPE_AP_VLAN:
1491         case NL80211_IFTYPE_P2P_DEVICE:
1492                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1493                 break;
1494         case NL80211_IFTYPE_UNSPECIFIED:
1495         case NUM_NL80211_IFTYPES:
1496                 BUG();
1497                 break;
1498         }
1499
1500         ieee80211_debugfs_add_netdev(sdata);
1501 }
1502
1503 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1504                                            enum nl80211_iftype type)
1505 {
1506         struct ieee80211_local *local = sdata->local;
1507         int ret, err;
1508         enum nl80211_iftype internal_type = type;
1509         bool p2p = false;
1510
1511         ASSERT_RTNL();
1512
1513         if (!local->ops->change_interface)
1514                 return -EBUSY;
1515
1516         switch (sdata->vif.type) {
1517         case NL80211_IFTYPE_AP:
1518         case NL80211_IFTYPE_STATION:
1519         case NL80211_IFTYPE_ADHOC:
1520         case NL80211_IFTYPE_OCB:
1521                 /*
1522                  * Could maybe also all others here?
1523                  * Just not sure how that interacts
1524                  * with the RX/config path e.g. for
1525                  * mesh.
1526                  */
1527                 break;
1528         default:
1529                 return -EBUSY;
1530         }
1531
1532         switch (type) {
1533         case NL80211_IFTYPE_AP:
1534         case NL80211_IFTYPE_STATION:
1535         case NL80211_IFTYPE_ADHOC:
1536         case NL80211_IFTYPE_OCB:
1537                 /*
1538                  * Could probably support everything
1539                  * but WDS here (WDS do_open can fail
1540                  * under memory pressure, which this
1541                  * code isn't prepared to handle).
1542                  */
1543                 break;
1544         case NL80211_IFTYPE_P2P_CLIENT:
1545                 p2p = true;
1546                 internal_type = NL80211_IFTYPE_STATION;
1547                 break;
1548         case NL80211_IFTYPE_P2P_GO:
1549                 p2p = true;
1550                 internal_type = NL80211_IFTYPE_AP;
1551                 break;
1552         default:
1553                 return -EBUSY;
1554         }
1555
1556         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1557         if (ret)
1558                 return ret;
1559
1560         ieee80211_do_stop(sdata, false);
1561
1562         ieee80211_teardown_sdata(sdata);
1563
1564         ret = drv_change_interface(local, sdata, internal_type, p2p);
1565         if (ret)
1566                 type = ieee80211_vif_type_p2p(&sdata->vif);
1567
1568         /*
1569          * Ignore return value here, there's not much we can do since
1570          * the driver changed the interface type internally already.
1571          * The warnings will hopefully make driver authors fix it :-)
1572          */
1573         ieee80211_check_queues(sdata, type);
1574
1575         ieee80211_setup_sdata(sdata, type);
1576
1577         err = ieee80211_do_open(&sdata->wdev, false);
1578         WARN(err, "type change: do_open returned %d", err);
1579
1580         return ret;
1581 }
1582
1583 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1584                              enum nl80211_iftype type)
1585 {
1586         int ret;
1587
1588         ASSERT_RTNL();
1589
1590         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1591                 return 0;
1592
1593         if (ieee80211_sdata_running(sdata)) {
1594                 ret = ieee80211_runtime_change_iftype(sdata, type);
1595                 if (ret)
1596                         return ret;
1597         } else {
1598                 /* Purge and reset type-dependent state. */
1599                 ieee80211_teardown_sdata(sdata);
1600                 ieee80211_setup_sdata(sdata, type);
1601         }
1602
1603         /* reset some values that shouldn't be kept across type changes */
1604         if (type == NL80211_IFTYPE_STATION)
1605                 sdata->u.mgd.use_4addr = false;
1606
1607         return 0;
1608 }
1609
1610 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1611                                        u8 *perm_addr, enum nl80211_iftype type)
1612 {
1613         struct ieee80211_sub_if_data *sdata;
1614         u64 mask, start, addr, val, inc;
1615         u8 *m;
1616         u8 tmp_addr[ETH_ALEN];
1617         int i;
1618
1619         /* default ... something at least */
1620         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1621
1622         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1623             local->hw.wiphy->n_addresses <= 1)
1624                 return;
1625
1626         mutex_lock(&local->iflist_mtx);
1627
1628         switch (type) {
1629         case NL80211_IFTYPE_MONITOR:
1630                 /* doesn't matter */
1631                 break;
1632         case NL80211_IFTYPE_WDS:
1633         case NL80211_IFTYPE_AP_VLAN:
1634                 /* match up with an AP interface */
1635                 list_for_each_entry(sdata, &local->interfaces, list) {
1636                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1637                                 continue;
1638                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1639                         break;
1640                 }
1641                 /* keep default if no AP interface present */
1642                 break;
1643         case NL80211_IFTYPE_P2P_CLIENT:
1644         case NL80211_IFTYPE_P2P_GO:
1645                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1646                         list_for_each_entry(sdata, &local->interfaces, list) {
1647                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1648                                         continue;
1649                                 if (!ieee80211_sdata_running(sdata))
1650                                         continue;
1651                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1652                                 goto out_unlock;
1653                         }
1654                 }
1655                 /* otherwise fall through */
1656         default:
1657                 /* assign a new address if possible -- try n_addresses first */
1658                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1659                         bool used = false;
1660
1661                         list_for_each_entry(sdata, &local->interfaces, list) {
1662                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1663                                                      sdata->vif.addr)) {
1664                                         used = true;
1665                                         break;
1666                                 }
1667                         }
1668
1669                         if (!used) {
1670                                 memcpy(perm_addr,
1671                                        local->hw.wiphy->addresses[i].addr,
1672                                        ETH_ALEN);
1673                                 break;
1674                         }
1675                 }
1676
1677                 /* try mask if available */
1678                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1679                         break;
1680
1681                 m = local->hw.wiphy->addr_mask;
1682                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1683                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1684                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1685
1686                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1687                         /* not a contiguous mask ... not handled now! */
1688                         pr_info("not contiguous\n");
1689                         break;
1690                 }
1691
1692                 /*
1693                  * Pick address of existing interface in case user changed
1694                  * MAC address manually, default to perm_addr.
1695                  */
1696                 m = local->hw.wiphy->perm_addr;
1697                 list_for_each_entry(sdata, &local->interfaces, list) {
1698                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1699                                 continue;
1700                         m = sdata->vif.addr;
1701                         break;
1702                 }
1703                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1704                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1705                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1706
1707                 inc = 1ULL<<__ffs64(mask);
1708                 val = (start & mask);
1709                 addr = (start & ~mask) | (val & mask);
1710                 do {
1711                         bool used = false;
1712
1713                         tmp_addr[5] = addr >> 0*8;
1714                         tmp_addr[4] = addr >> 1*8;
1715                         tmp_addr[3] = addr >> 2*8;
1716                         tmp_addr[2] = addr >> 3*8;
1717                         tmp_addr[1] = addr >> 4*8;
1718                         tmp_addr[0] = addr >> 5*8;
1719
1720                         val += inc;
1721
1722                         list_for_each_entry(sdata, &local->interfaces, list) {
1723                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1724                                         used = true;
1725                                         break;
1726                                 }
1727                         }
1728
1729                         if (!used) {
1730                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1731                                 break;
1732                         }
1733                         addr = (start & ~mask) | (val & mask);
1734                 } while (addr != start);
1735
1736                 break;
1737         }
1738
1739  out_unlock:
1740         mutex_unlock(&local->iflist_mtx);
1741 }
1742
1743 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1744                      unsigned char name_assign_type,
1745                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1746                      struct vif_params *params)
1747 {
1748         struct net_device *ndev = NULL;
1749         struct ieee80211_sub_if_data *sdata = NULL;
1750         struct txq_info *txqi;
1751         void (*if_setup)(struct net_device *dev);
1752         int ret, i;
1753         int txqs = 1;
1754
1755         ASSERT_RTNL();
1756
1757         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1758                 struct wireless_dev *wdev;
1759
1760                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1761                                 GFP_KERNEL);
1762                 if (!sdata)
1763                         return -ENOMEM;
1764                 wdev = &sdata->wdev;
1765
1766                 sdata->dev = NULL;
1767                 strlcpy(sdata->name, name, IFNAMSIZ);
1768                 ieee80211_assign_perm_addr(local, wdev->address, type);
1769                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1770         } else {
1771                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1772                                  sizeof(void *));
1773                 int txq_size = 0;
1774
1775                 if (local->ops->wake_tx_queue)
1776                         txq_size += sizeof(struct txq_info) +
1777                                     local->hw.txq_data_size;
1778
1779                 if (local->ops->wake_tx_queue)
1780                         if_setup = ieee80211_if_setup_no_queue;
1781                 else
1782                         if_setup = ieee80211_if_setup;
1783
1784                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1785                         txqs = IEEE80211_NUM_ACS;
1786
1787                 ndev = alloc_netdev_mqs(size + txq_size,
1788                                         name, name_assign_type,
1789                                         if_setup, txqs, 1);
1790                 if (!ndev)
1791                         return -ENOMEM;
1792                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1793
1794                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1795                 if (!ndev->tstats) {
1796                         free_netdev(ndev);
1797                         return -ENOMEM;
1798                 }
1799
1800                 ndev->needed_headroom = local->tx_headroom +
1801                                         4*6 /* four MAC addresses */
1802                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1803                                         + 6 /* mesh */
1804                                         + 8 /* rfc1042/bridge tunnel */
1805                                         - ETH_HLEN /* ethernet hard_header_len */
1806                                         + IEEE80211_ENCRYPT_HEADROOM;
1807                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1808
1809                 ret = dev_alloc_name(ndev, ndev->name);
1810                 if (ret < 0) {
1811                         ieee80211_if_free(ndev);
1812                         return ret;
1813                 }
1814
1815                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1816                 if (params && is_valid_ether_addr(params->macaddr))
1817                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1818                 else
1819                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1820                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1821
1822                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1823                 sdata = netdev_priv(ndev);
1824                 ndev->ieee80211_ptr = &sdata->wdev;
1825                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1826                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1827
1828                 if (txq_size) {
1829                         txqi = netdev_priv(ndev) + size;
1830                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1831                 }
1832
1833                 sdata->dev = ndev;
1834         }
1835
1836         /* initialise type-independent data */
1837         sdata->wdev.wiphy = local->hw.wiphy;
1838         sdata->local = local;
1839
1840         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1841                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1842
1843         INIT_LIST_HEAD(&sdata->key_list);
1844
1845         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1846                           ieee80211_dfs_cac_timer_work);
1847         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1848                           ieee80211_delayed_tailroom_dec);
1849
1850         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1851                 struct ieee80211_supported_band *sband;
1852                 sband = local->hw.wiphy->bands[i];
1853                 sdata->rc_rateidx_mask[i] =
1854                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1855                 if (sband) {
1856                         __le16 cap;
1857                         u16 *vht_rate_mask;
1858
1859                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1860                                sband->ht_cap.mcs.rx_mask,
1861                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1862
1863                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1864                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1865                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1866                 } else {
1867                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1868                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1869                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1870                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1871                 }
1872         }
1873
1874         ieee80211_set_default_queues(sdata);
1875
1876         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1877         sdata->user_power_level = local->user_power_level;
1878
1879         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1880
1881         /* setup type-dependent data */
1882         ieee80211_setup_sdata(sdata, type);
1883
1884         if (ndev) {
1885                 if (params) {
1886                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1887                         if (type == NL80211_IFTYPE_STATION)
1888                                 sdata->u.mgd.use_4addr = params->use_4addr;
1889                 }
1890
1891                 ndev->features |= local->hw.netdev_features;
1892
1893                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1894
1895                 /* MTU range: 256 - 2304 */
1896                 ndev->min_mtu = 256;
1897                 ndev->max_mtu = IEEE80211_MAX_DATA_LEN;
1898
1899                 ret = register_netdevice(ndev);
1900                 if (ret) {
1901                         ieee80211_if_free(ndev);
1902                         return ret;
1903                 }
1904         }
1905
1906         mutex_lock(&local->iflist_mtx);
1907         list_add_tail_rcu(&sdata->list, &local->interfaces);
1908         mutex_unlock(&local->iflist_mtx);
1909
1910         if (new_wdev)
1911                 *new_wdev = &sdata->wdev;
1912
1913         return 0;
1914 }
1915
1916 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1917 {
1918         ASSERT_RTNL();
1919
1920         mutex_lock(&sdata->local->iflist_mtx);
1921         list_del_rcu(&sdata->list);
1922         mutex_unlock(&sdata->local->iflist_mtx);
1923
1924         synchronize_rcu();
1925
1926         if (sdata->dev) {
1927                 unregister_netdevice(sdata->dev);
1928         } else {
1929                 cfg80211_unregister_wdev(&sdata->wdev);
1930                 ieee80211_teardown_sdata(sdata);
1931                 kfree(sdata);
1932         }
1933 }
1934
1935 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1936 {
1937         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1938                 return;
1939         ieee80211_do_stop(sdata, true);
1940 }
1941
1942 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1943 {
1944         struct ieee80211_sub_if_data *sdata, *tmp;
1945         LIST_HEAD(unreg_list);
1946         LIST_HEAD(wdev_list);
1947
1948         ASSERT_RTNL();
1949
1950         /* Before destroying the interfaces, make sure they're all stopped so
1951          * that the hardware is stopped. Otherwise, the driver might still be
1952          * iterating the interfaces during the shutdown, e.g. from a worker
1953          * or from RX processing or similar, and if it does so (using atomic
1954          * iteration) while we're manipulating the list, the iteration will
1955          * crash.
1956          *
1957          * After this, the hardware should be stopped and the driver should
1958          * have stopped all of its activities, so that we can do RCU-unaware
1959          * manipulations of the interface list below.
1960          */
1961         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1962
1963         WARN(local->open_count, "%s: open count remains %d\n",
1964              wiphy_name(local->hw.wiphy), local->open_count);
1965
1966         mutex_lock(&local->iflist_mtx);
1967         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1968                 list_del(&sdata->list);
1969
1970                 if (sdata->dev)
1971                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1972                 else
1973                         list_add(&sdata->list, &wdev_list);
1974         }
1975         mutex_unlock(&local->iflist_mtx);
1976         unregister_netdevice_many(&unreg_list);
1977
1978         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1979                 list_del(&sdata->list);
1980                 cfg80211_unregister_wdev(&sdata->wdev);
1981                 kfree(sdata);
1982         }
1983 }
1984
1985 static int netdev_notify(struct notifier_block *nb,
1986                          unsigned long state, void *ptr)
1987 {
1988         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1989         struct ieee80211_sub_if_data *sdata;
1990
1991         if (state != NETDEV_CHANGENAME)
1992                 return NOTIFY_DONE;
1993
1994         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1995                 return NOTIFY_DONE;
1996
1997         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1998                 return NOTIFY_DONE;
1999
2000         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2001         memcpy(sdata->name, dev->name, IFNAMSIZ);
2002         ieee80211_debugfs_rename_netdev(sdata);
2003
2004         return NOTIFY_OK;
2005 }
2006
2007 static struct notifier_block mac80211_netdev_notifier = {
2008         .notifier_call = netdev_notify,
2009 };
2010
2011 int ieee80211_iface_init(void)
2012 {
2013         return register_netdevice_notifier(&mac80211_netdev_notifier);
2014 }
2015
2016 void ieee80211_iface_exit(void)
2017 {
2018         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2019 }
2020
2021 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2022 {
2023         if (sdata->vif.type == NL80211_IFTYPE_AP)
2024                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2025         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2026                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2027 }
2028
2029 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2030 {
2031         if (sdata->vif.type == NL80211_IFTYPE_AP)
2032                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2033         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2034                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2035 }