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->control_port_over_nl80211 =
 523                         master->control_port_over_nl80211;
 524                 sdata->vif.cab_queue = master->vif.cab_queue;
 525                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
 526                        sizeof(sdata->vif.hw_queue));
 527                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
 528
 529                 mutex_lock(&local->key_mtx);
 530                 sdata->crypto_tx_tailroom_needed_cnt +=
 531                         master->crypto_tx_tailroom_needed_cnt;
 532                 mutex_unlock(&local->key_mtx);
 533
 534                 break;
 535                 }
 536         case NL80211_IFTYPE_AP:
 537                 sdata->bss = &sdata->u.ap;
 538                 break;
 539         case NL80211_IFTYPE_MESH_POINT:
 540         case NL80211_IFTYPE_STATION:
 541         case NL80211_IFTYPE_MONITOR:
 542         case NL80211_IFTYPE_ADHOC:
 543         case NL80211_IFTYPE_P2P_DEVICE:
 544         case NL80211_IFTYPE_OCB:
 545         case NL80211_IFTYPE_NAN:
 546                 /* no special treatment */
 547                 break;
 548         case NL80211_IFTYPE_UNSPECIFIED:
 549         case NUM_NL80211_IFTYPES:
 550         case NL80211_IFTYPE_P2P_CLIENT:
 551         case NL80211_IFTYPE_P2P_GO:
 552                 /* cannot happen */
 553                 WARN_ON(1);
 554                 break;
 555         }
 556
 557         if (local->open_count == 0) {
 558                 res = drv_start(local);
 559                 if (res)
 560                         goto err_del_bss;
 561                 /* we're brought up, everything changes */
 562                 hw_reconf_flags = ~0;
 563                 ieee80211_led_radio(local, true);
 564                 ieee80211_mod_tpt_led_trig(local,
 565                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 566         }
 567
 568         /*
 569          * Copy the hopefully now-present MAC address to
 570          * this interface, if it has the special null one.
 571          */
 572         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 573                 memcpy(dev->dev_addr,
 574                        local->hw.wiphy->perm_addr,
 575                        ETH_ALEN);
 576                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 577
 578                 if (!is_valid_ether_addr(dev->dev_addr)) {
 579                         res = -EADDRNOTAVAIL;
 580                         goto err_stop;
 581                 }
 582         }
 583
 584         switch (sdata->vif.type) {
 585         case NL80211_IFTYPE_AP_VLAN:
 586                 /* no need to tell driver, but set carrier and chanctx */
 587                 if (rtnl_dereference(sdata->bss->beacon)) {
 588                         ieee80211_vif_vlan_copy_chanctx(sdata);
 589                         netif_carrier_on(dev);
 590                 } else {
 591                         netif_carrier_off(dev);
 592                 }
 593                 break;
 594         case NL80211_IFTYPE_MONITOR:
 595                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 596                         local->cooked_mntrs++;
 597                         break;
 598                 }
 599
 600                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
 601                         res = drv_add_interface(local, sdata);
 602                         if (res)
 603                                 goto err_stop;
 604                 } else if (local->monitors == 0 && local->open_count == 0) {
 605                         res = ieee80211_add_virtual_monitor(local);
 606                         if (res)
 607                                 goto err_stop;
 608                 }
 609
 610                 /* must be before the call to ieee80211_configure_filter */
 611                 local->monitors++;
 612                 if (local->monitors == 1) {
 613                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 614                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 615                 }
 616
 617                 ieee80211_adjust_monitor_flags(sdata, 1);
 618                 ieee80211_configure_filter(local);
 619                 mutex_lock(&local->mtx);
 620                 ieee80211_recalc_idle(local);
 621                 mutex_unlock(&local->mtx);
 622
 623                 netif_carrier_on(dev);
 624                 break;
 625         default:
 626                 if (coming_up) {
 627                         ieee80211_del_virtual_monitor(local);
 628
 629                         res = drv_add_interface(local, sdata);
 630                         if (res)
 631                                 goto err_stop;
 632                         res = ieee80211_check_queues(sdata,
 633                                 ieee80211_vif_type_p2p(&sdata->vif));
 634                         if (res)
 635                                 goto err_del_interface;
 636                 }
 637
 638                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 639                         local->fif_pspoll++;
 640                         local->fif_probe_req++;
 641
 642                         ieee80211_configure_filter(local);
 643                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 644                         local->fif_probe_req++;
 645                 }
 646
 647                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
 648                     sdata->vif.type != NL80211_IFTYPE_NAN)
 649                         changed |= ieee80211_reset_erp_info(sdata);
 650                 ieee80211_bss_info_change_notify(sdata, changed);
 651
 652                 switch (sdata->vif.type) {
 653                 case NL80211_IFTYPE_STATION:
 654                 case NL80211_IFTYPE_ADHOC:
 655                 case NL80211_IFTYPE_AP:
 656                 case NL80211_IFTYPE_MESH_POINT:
 657                 case NL80211_IFTYPE_OCB:
 658                         netif_carrier_off(dev);
 659                         break;
 660                 case NL80211_IFTYPE_WDS:
 661                 case NL80211_IFTYPE_P2P_DEVICE:
 662                 case NL80211_IFTYPE_NAN:
 663                         break;
 664                 default:
 665                         /* not reached */
 666                         WARN_ON(1);
 667                 }
 668
 669                 /*
 670                  * Set default queue parameters so drivers don't
 671                  * need to initialise the hardware if the hardware
 672                  * doesn't start up with sane defaults.
 673                  * Enable QoS for anything but station interfaces.
 674                  */
 675                 ieee80211_set_wmm_default(sdata, true,
 676                         sdata->vif.type != NL80211_IFTYPE_STATION);
 677         }
 678
 679         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 680
 681         switch (sdata->vif.type) {
 682         case NL80211_IFTYPE_WDS:
 683                 /* Create STA entry for the WDS peer */
 684                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 685                                      GFP_KERNEL);
 686                 if (!sta) {
 687                         res = -ENOMEM;
 688                         goto err_del_interface;
 689                 }
 690
 691                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 692                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 693                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 694
 695                 res = sta_info_insert(sta);
 696                 if (res) {
 697                         /* STA has been freed */
 698                         goto err_del_interface;
 699                 }
 700
 701                 rate_control_rate_init(sta);
 702                 netif_carrier_on(dev);
 703                 break;
 704         case NL80211_IFTYPE_P2P_DEVICE:
 705                 rcu_assign_pointer(local->p2p_sdata, sdata);
 706                 break;
 707         case NL80211_IFTYPE_MONITOR:
 708                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
 709                         break;
 710                 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
 711                 break;
 712         default:
 713                 break;
 714         }
 715
 716         /*
 717          * set_multicast_list will be invoked by the networking core
 718          * which will check whether any increments here were done in
 719          * error and sync them down to the hardware as filter flags.
 720          */
 721         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 722                 atomic_inc(&local->iff_allmultis);
 723
 724         if (coming_up)
 725                 local->open_count++;
 726
 727         if (hw_reconf_flags)
 728                 ieee80211_hw_config(local, hw_reconf_flags);
 729
 730         ieee80211_recalc_ps(local);
 731
 732         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 733             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
 734             local->ops->wake_tx_queue) {
 735                 /* XXX: for AP_VLAN, actually track AP queues */
 736                 if (dev)
 737                         netif_tx_start_all_queues(dev);
 738         } else if (dev) {
 739                 unsigned long flags;
 740                 int n_acs = IEEE80211_NUM_ACS;
 741                 int ac;
 742
 743                 if (local->hw.queues < IEEE80211_NUM_ACS)
 744                         n_acs = 1;
 745
 746                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 747                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 748                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 749                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 750                         for (ac = 0; ac < n_acs; ac++) {
 751                                 int ac_queue = sdata->vif.hw_queue[ac];
 752
 753                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 754                                     skb_queue_empty(&local->pending[ac_queue]))
 755                                         netif_start_subqueue(dev, ac);
 756                         }
 757                 }
 758                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 759         }
 760
 761         return 0;
 762  err_del_interface:
 763         drv_remove_interface(local, sdata);
 764  err_stop:
 765         if (!local->open_count)
 766                 drv_stop(local);
 767  err_del_bss:
 768         sdata->bss = NULL;
 769         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 770                 mutex_lock(&local->mtx);
 771                 list_del(&sdata->u.vlan.list);
 772                 mutex_unlock(&local->mtx);
 773         }
 774         /* might already be clear but that doesn't matter */
 775         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 776         return res;
 777 }
 778
 779 static int ieee80211_open(struct net_device *dev)
 780 {
 781         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 782         int err;
 783
 784         /* fail early if user set an invalid address */
 785         if (!is_valid_ether_addr(dev->dev_addr))
 786                 return -EADDRNOTAVAIL;
 787
 788         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 789         if (err)
 790                 return err;
 791
 792         return ieee80211_do_open(&sdata->wdev, true);
 793 }
 794
 795 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 796                               bool going_down)
 797 {
 798         struct ieee80211_local *local = sdata->local;
 799         unsigned long flags;
 800         struct sk_buff *skb, *tmp;
 801         u32 hw_reconf_flags = 0;
 802         int i, flushed;
 803         struct ps_data *ps;
 804         struct cfg80211_chan_def chandef;
 805         bool cancel_scan;
 806         struct cfg80211_nan_func *func;
 807
 808         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 809
 810         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 811         if (cancel_scan)
 812                 ieee80211_scan_cancel(local);
 813
 814         /*
 815          * Stop TX on this interface first.
 816          */
 817         if (sdata->dev)
 818                 netif_tx_stop_all_queues(sdata->dev);
 819
 820         ieee80211_roc_purge(local, sdata);
 821
 822         switch (sdata->vif.type) {
 823         case NL80211_IFTYPE_STATION:
 824                 ieee80211_mgd_stop(sdata);
 825                 break;
 826         case NL80211_IFTYPE_ADHOC:
 827                 ieee80211_ibss_stop(sdata);
 828                 break;
 829         case NL80211_IFTYPE_AP:
 830                 cancel_work_sync(&sdata->u.ap.request_smps_work);
 831                 break;
 832         case NL80211_IFTYPE_MONITOR:
 833                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
 834                         break;
 835                 list_del_rcu(&sdata->u.mntr.list);
 836                 break;
 837         default:
 838                 break;
 839         }
 840
 841         /*
 842          * Remove all stations associated with this interface.
 843          *
 844          * This must be done before calling ops->remove_interface()
 845          * because otherwise we can later invoke ops->sta_notify()
 846          * whenever the STAs are removed, and that invalidates driver
 847          * assumptions about always getting a vif pointer that is valid
 848          * (because if we remove a STA after ops->remove_interface()
 849          * the driver will have removed the vif info already!)
 850          *
 851          * In WDS mode a station must exist here and be flushed, for
 852          * AP_VLANs stations may exist since there's nothing else that
 853          * would have removed them, but in other modes there shouldn't
 854          * be any stations.
 855          */
 856         flushed = sta_info_flush(sdata);
 857         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
 858                      ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 859                       (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
 860
 861         /* don't count this interface for allmulti while it is down */
 862         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 863                 atomic_dec(&local->iff_allmultis);
 864
 865         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 866                 local->fif_pspoll--;
 867                 local->fif_probe_req--;
 868         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 869                 local->fif_probe_req--;
 870         }
 871
 872         if (sdata->dev) {
 873                 netif_addr_lock_bh(sdata->dev);
 874                 spin_lock_bh(&local->filter_lock);
 875                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 876                                  sdata->dev->addr_len);
 877                 spin_unlock_bh(&local->filter_lock);
 878                 netif_addr_unlock_bh(sdata->dev);
 879         }
 880
 881         del_timer_sync(&local->dynamic_ps_timer);
 882         cancel_work_sync(&local->dynamic_ps_enable_work);
 883
 884         cancel_work_sync(&sdata->recalc_smps);
 885         sdata_lock(sdata);
 886         mutex_lock(&local->mtx);
 887         sdata->vif.csa_active = false;
 888         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 889                 sdata->u.mgd.csa_waiting_bcn = false;
 890         if (sdata->csa_block_tx) {
 891                 ieee80211_wake_vif_queues(local, sdata,
 892                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 893                 sdata->csa_block_tx = false;
 894         }
 895         mutex_unlock(&local->mtx);
 896         sdata_unlock(sdata);
 897
 898         cancel_work_sync(&sdata->csa_finalize_work);
 899
 900         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 901
 902         if (sdata->wdev.cac_started) {
 903                 chandef = sdata->vif.bss_conf.chandef;
 904                 WARN_ON(local->suspended);
 905                 mutex_lock(&local->mtx);
 906                 ieee80211_vif_release_channel(sdata);
 907                 mutex_unlock(&local->mtx);
 908                 cfg80211_cac_event(sdata->dev, &chandef,
 909                                    NL80211_RADAR_CAC_ABORTED,
 910                                    GFP_KERNEL);
 911         }
 912
 913         /* APs need special treatment */
 914         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 915                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 916
 917                 /* down all dependent devices, that is VLANs */
 918                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 919                                          u.vlan.list)
 920                         dev_close(vlan->dev);
 921                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 922         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 923                 /* remove all packets in parent bc_buf pointing to this dev */
 924                 ps = &sdata->bss->ps;
 925
 926                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 927                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 928                         if (skb->dev == sdata->dev) {
 929                                 __skb_unlink(skb, &ps->bc_buf);
 930                                 local->total_ps_buffered--;
 931                                 ieee80211_free_txskb(&local->hw, skb);
 932                         }
 933                 }
 934                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 935         }
 936
 937         if (going_down)
 938                 local->open_count--;
 939
 940         switch (sdata->vif.type) {
 941         case NL80211_IFTYPE_AP_VLAN:
 942                 mutex_lock(&local->mtx);
 943                 list_del(&sdata->u.vlan.list);
 944                 mutex_unlock(&local->mtx);
 945                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 946                 /* see comment in the default case below */
 947                 ieee80211_free_keys(sdata, true);
 948                 /* no need to tell driver */
 949                 break;
 950         case NL80211_IFTYPE_MONITOR:
 951                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 952                         local->cooked_mntrs--;
 953                         break;
 954                 }
 955
 956                 local->monitors--;
 957                 if (local->monitors == 0) {
 958                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 959                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 960                 }
 961
 962                 ieee80211_adjust_monitor_flags(sdata, -1);
 963                 break;
 964         case NL80211_IFTYPE_NAN:
 965                 /* clean all the functions */
 966                 spin_lock_bh(&sdata->u.nan.func_lock);
 967
 968                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
 969                         idr_remove(&sdata->u.nan.function_inst_ids, i);
 970                         cfg80211_free_nan_func(func);
 971                 }
 972                 idr_destroy(&sdata->u.nan.function_inst_ids);
 973
 974                 spin_unlock_bh(&sdata->u.nan.func_lock);
 975                 break;
 976         case NL80211_IFTYPE_P2P_DEVICE:
 977                 /* relies on synchronize_rcu() below */
 978                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 979                 /* fall through */
 980         default:
 981                 cancel_work_sync(&sdata->work);
 982                 /*
 983                  * When we get here, the interface is marked down.
 984                  * Free the remaining keys, if there are any
 985                  * (which can happen in AP mode if userspace sets
 986                  * keys before the interface is operating, and maybe
 987                  * also in WDS mode)
 988                  *
 989                  * Force the key freeing to always synchronize_net()
 990                  * to wait for the RX path in case it is using this
 991                  * interface enqueuing frames at this very time on
 992                  * another CPU.
 993                  */
 994                 ieee80211_free_keys(sdata, true);
 995                 skb_queue_purge(&sdata->skb_queue);
 996         }
 997
 998         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 999         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
1000                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
1001                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1002                         if (info->control.vif == &sdata->vif) {
1003                                 __skb_unlink(skb, &local->pending[i]);
1004                                 ieee80211_free_txskb(&local->hw, skb);
1005                         }
1006                 }
1007         }
1008         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1009
1010         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1011                 ieee80211_txq_remove_vlan(local, sdata);
1012
1013         sdata->bss = NULL;
1014
1015         if (local->open_count == 0)
1016                 ieee80211_clear_tx_pending(local);
1017
1018         sdata->vif.bss_conf.beacon_int = 0;
1019
1020         /*
1021          * If the interface goes down while suspended, presumably because
1022          * the device was unplugged and that happens before our resume,
1023          * then the driver is already unconfigured and the remainder of
1024          * this function isn't needed.
1025          * XXX: what about WoWLAN? If the device has software state, e.g.
1026          *      memory allocated, it might expect teardown commands from
1027          *      mac80211 here?
1028          */
1029         if (local->suspended) {
1030                 WARN_ON(local->wowlan);
1031                 WARN_ON(rtnl_dereference(local->monitor_sdata));
1032                 return;
1033         }
1034
1035         switch (sdata->vif.type) {
1036         case NL80211_IFTYPE_AP_VLAN:
1037                 break;
1038         case NL80211_IFTYPE_MONITOR:
1039                 if (local->monitors == 0)
1040                         ieee80211_del_virtual_monitor(local);
1041
1042                 mutex_lock(&local->mtx);
1043                 ieee80211_recalc_idle(local);
1044                 mutex_unlock(&local->mtx);
1045
1046                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1047                         break;
1048
1049                 /* fall through */
1050         default:
1051                 if (going_down)
1052                         drv_remove_interface(local, sdata);
1053         }
1054
1055         ieee80211_recalc_ps(local);
1056
1057         if (cancel_scan)
1058                 flush_delayed_work(&local->scan_work);
1059
1060         if (local->open_count == 0) {
1061                 ieee80211_stop_device(local);
1062
1063                 /* no reconfiguring after stop! */
1064                 return;
1065         }
1066
1067         /* do after stop to avoid reconfiguring when we stop anyway */
1068         ieee80211_configure_filter(local);
1069         ieee80211_hw_config(local, hw_reconf_flags);
1070
1071         if (local->monitors == local->open_count)
1072                 ieee80211_add_virtual_monitor(local);
1073 }
1074
1075 static int ieee80211_stop(struct net_device *dev)
1076 {
1077         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1078
1079         ieee80211_do_stop(sdata, true);
1080
1081         return 0;
1082 }
1083
1084 static void ieee80211_set_multicast_list(struct net_device *dev)
1085 {
1086         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1087         struct ieee80211_local *local = sdata->local;
1088         int allmulti, sdata_allmulti;
1089
1090         allmulti = !!(dev->flags & IFF_ALLMULTI);
1091         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1092
1093         if (allmulti != sdata_allmulti) {
1094                 if (dev->flags & IFF_ALLMULTI)
1095                         atomic_inc(&local->iff_allmultis);
1096                 else
1097                         atomic_dec(&local->iff_allmultis);
1098                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1099         }
1100
1101         spin_lock_bh(&local->filter_lock);
1102         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1103         spin_unlock_bh(&local->filter_lock);
1104         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1105 }
1106
1107 /*
1108  * Called when the netdev is removed or, by the code below, before
1109  * the interface type changes.
1110  */
1111 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1112 {
1113         int i;
1114
1115         /* free extra data */
1116         ieee80211_free_keys(sdata, false);
1117
1118         ieee80211_debugfs_remove_netdev(sdata);
1119
1120         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1121                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1122         sdata->fragment_next = 0;
1123
1124         if (ieee80211_vif_is_mesh(&sdata->vif))
1125                 ieee80211_mesh_teardown_sdata(sdata);
1126 }
1127
1128 static void ieee80211_uninit(struct net_device *dev)
1129 {
1130         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1131 }
1132
1133 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1134                                          struct sk_buff *skb,
1135                                          struct net_device *sb_dev,
1136                                          select_queue_fallback_t fallback)
1137 {
1138         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1139 }
1140
1141 static void
1142 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1143 {
1144         int i;
1145
1146         for_each_possible_cpu(i) {
1147                 const struct pcpu_sw_netstats *tstats;
1148                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1149                 unsigned int start;
1150
1151                 tstats = per_cpu_ptr(dev->tstats, i);
1152
1153                 do {
1154                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
1155                         rx_packets = tstats->rx_packets;
1156                         tx_packets = tstats->tx_packets;
1157                         rx_bytes = tstats->rx_bytes;
1158                         tx_bytes = tstats->tx_bytes;
1159                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1160
1161                 stats->rx_packets += rx_packets;
1162                 stats->tx_packets += tx_packets;
1163                 stats->rx_bytes   += rx_bytes;
1164                 stats->tx_bytes   += tx_bytes;
1165         }
1166 }
1167
1168 static const struct net_device_ops ieee80211_dataif_ops = {
1169         .ndo_open               = ieee80211_open,
1170         .ndo_stop               = ieee80211_stop,
1171         .ndo_uninit             = ieee80211_uninit,
1172         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1173         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1174         .ndo_set_mac_address    = ieee80211_change_mac,
1175         .ndo_select_queue       = ieee80211_netdev_select_queue,
1176         .ndo_get_stats64        = ieee80211_get_stats64,
1177 };
1178
1179 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1180                                           struct sk_buff *skb,
1181                                           struct net_device *sb_dev,
1182                                           select_queue_fallback_t fallback)
1183 {
1184         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1185         struct ieee80211_local *local = sdata->local;
1186         struct ieee80211_hdr *hdr;
1187         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1188
1189         if (local->hw.queues < IEEE80211_NUM_ACS)
1190                 return 0;
1191
1192         if (skb->len < 4 ||
1193             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1194                 return 0; /* doesn't matter, frame will be dropped */
1195
1196         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1197
1198         return ieee80211_select_queue_80211(sdata, skb, hdr);
1199 }
1200
1201 static const struct net_device_ops ieee80211_monitorif_ops = {
1202         .ndo_open               = ieee80211_open,
1203         .ndo_stop               = ieee80211_stop,
1204         .ndo_uninit             = ieee80211_uninit,
1205         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1206         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1207         .ndo_set_mac_address    = ieee80211_change_mac,
1208         .ndo_select_queue       = ieee80211_monitor_select_queue,
1209         .ndo_get_stats64        = ieee80211_get_stats64,
1210 };
1211
1212 static void ieee80211_if_free(struct net_device *dev)
1213 {
1214         free_percpu(dev->tstats);
1215 }
1216
1217 static void ieee80211_if_setup(struct net_device *dev)
1218 {
1219         ether_setup(dev);
1220         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1221         dev->netdev_ops = &ieee80211_dataif_ops;
1222         dev->needs_free_netdev = true;
1223         dev->priv_destructor = ieee80211_if_free;
1224 }
1225
1226 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1227 {
1228         ieee80211_if_setup(dev);
1229         dev->priv_flags |= IFF_NO_QUEUE;
1230 }
1231
1232 static void ieee80211_iface_work(struct work_struct *work)
1233 {
1234         struct ieee80211_sub_if_data *sdata =
1235                 container_of(work, struct ieee80211_sub_if_data, work);
1236         struct ieee80211_local *local = sdata->local;
1237         struct sk_buff *skb;
1238         struct sta_info *sta;
1239
1240         if (!ieee80211_sdata_running(sdata))
1241                 return;
1242
1243         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1244                 return;
1245
1246         if (!ieee80211_can_run_worker(local))
1247                 return;
1248
1249         /* first process frames */
1250         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1251                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1252
1253                 if (ieee80211_is_action(mgmt->frame_control) &&
1254                     mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1255                         int len = skb->len;
1256
1257                         mutex_lock(&local->sta_mtx);
1258                         sta = sta_info_get_bss(sdata, mgmt->sa);
1259                         if (sta) {
1260                                 switch (mgmt->u.action.u.addba_req.action_code) {
1261                                 case WLAN_ACTION_ADDBA_REQ:
1262                                         ieee80211_process_addba_request(
1263                                                         local, sta, mgmt, len);
1264                                         break;
1265                                 case WLAN_ACTION_ADDBA_RESP:
1266                                         ieee80211_process_addba_resp(local, sta,
1267                                                                      mgmt, len);
1268                                         break;
1269                                 case WLAN_ACTION_DELBA:
1270                                         ieee80211_process_delba(sdata, sta,
1271                                                                 mgmt, len);
1272                                         break;
1273                                 default:
1274                                         WARN_ON(1);
1275                                         break;
1276                                 }
1277                         }
1278                         mutex_unlock(&local->sta_mtx);
1279                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1280                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1281                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1282                         case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1283                                 struct ieee80211_rx_status *status;
1284                                 enum nl80211_band band;
1285                                 u8 opmode;
1286
1287                                 status = IEEE80211_SKB_RXCB(skb);
1288                                 band = status->band;
1289                                 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1290
1291                                 mutex_lock(&local->sta_mtx);
1292                                 sta = sta_info_get_bss(sdata, mgmt->sa);
1293
1294                                 if (sta)
1295                                         ieee80211_vht_handle_opmode(sdata, sta,
1296                                                                     opmode,
1297                                                                     band);
1298
1299                                 mutex_unlock(&local->sta_mtx);
1300                                 break;
1301                         }
1302                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1303                                 ieee80211_process_mu_groups(sdata, mgmt);
1304                                 break;
1305                         default:
1306                                 WARN_ON(1);
1307                                 break;
1308                         }
1309                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1310                         struct ieee80211_hdr *hdr = (void *)mgmt;
1311                         /*
1312                          * So the frame isn't mgmt, but frame_control
1313                          * is at the right place anyway, of course, so
1314                          * the if statement is correct.
1315                          *
1316                          * Warn if we have other data frame types here,
1317                          * they must not get here.
1318                          */
1319                         WARN_ON(hdr->frame_control &
1320                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1321                         WARN_ON(!(hdr->seq_ctrl &
1322                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1323                         /*
1324                          * This was a fragment of a frame, received while
1325                          * a block-ack session was active. That cannot be
1326                          * right, so terminate the session.
1327                          */
1328                         mutex_lock(&local->sta_mtx);
1329                         sta = sta_info_get_bss(sdata, mgmt->sa);
1330                         if (sta) {
1331                                 u16 tid = ieee80211_get_tid(hdr);
1332
1333                                 __ieee80211_stop_rx_ba_session(
1334                                         sta, tid, WLAN_BACK_RECIPIENT,
1335                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1336                                         true);
1337                         }
1338                         mutex_unlock(&local->sta_mtx);
1339                 } else switch (sdata->vif.type) {
1340                 case NL80211_IFTYPE_STATION:
1341                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1342                         break;
1343                 case NL80211_IFTYPE_ADHOC:
1344                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1345                         break;
1346                 case NL80211_IFTYPE_MESH_POINT:
1347                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1348                                 break;
1349                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1350                         break;
1351                 default:
1352                         WARN(1, "frame for unexpected interface type");
1353                         break;
1354                 }
1355
1356                 kfree_skb(skb);
1357         }
1358
1359         /* then other type-dependent work */
1360         switch (sdata->vif.type) {
1361         case NL80211_IFTYPE_STATION:
1362                 ieee80211_sta_work(sdata);
1363                 break;
1364         case NL80211_IFTYPE_ADHOC:
1365                 ieee80211_ibss_work(sdata);
1366                 break;
1367         case NL80211_IFTYPE_MESH_POINT:
1368                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1369                         break;
1370                 ieee80211_mesh_work(sdata);
1371                 break;
1372         case NL80211_IFTYPE_OCB:
1373                 ieee80211_ocb_work(sdata);
1374                 break;
1375         default:
1376                 break;
1377         }
1378 }
1379
1380 static void ieee80211_recalc_smps_work(struct work_struct *work)
1381 {
1382         struct ieee80211_sub_if_data *sdata =
1383                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1384
1385         ieee80211_recalc_smps(sdata);
1386 }
1387
1388 /*
1389  * Helper function to initialise an interface to a specific type.
1390  */
1391 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1392                                   enum nl80211_iftype type)
1393 {
1394         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1395                                                     0xff, 0xff, 0xff};
1396
1397         /* clear type-dependent union */
1398         memset(&sdata->u, 0, sizeof(sdata->u));
1399
1400         /* and set some type-dependent values */
1401         sdata->vif.type = type;
1402         sdata->vif.p2p = false;
1403         sdata->wdev.iftype = type;
1404
1405         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1406         sdata->control_port_no_encrypt = false;
1407         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1408         sdata->vif.bss_conf.idle = true;
1409
1410         sdata->noack_map = 0;
1411
1412         /* only monitor/p2p-device differ */
1413         if (sdata->dev) {
1414                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1415                 sdata->dev->type = ARPHRD_ETHER;
1416         }
1417
1418         skb_queue_head_init(&sdata->skb_queue);
1419         INIT_WORK(&sdata->work, ieee80211_iface_work);
1420         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1421         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1422         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1423         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1424
1425         switch (type) {
1426         case NL80211_IFTYPE_P2P_GO:
1427                 type = NL80211_IFTYPE_AP;
1428                 sdata->vif.type = type;
1429                 sdata->vif.p2p = true;
1430                 /* fall through */
1431         case NL80211_IFTYPE_AP:
1432                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1433                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1434                 INIT_WORK(&sdata->u.ap.request_smps_work,
1435                           ieee80211_request_smps_ap_work);
1436                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1437                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1438                 break;
1439         case NL80211_IFTYPE_P2P_CLIENT:
1440                 type = NL80211_IFTYPE_STATION;
1441                 sdata->vif.type = type;
1442                 sdata->vif.p2p = true;
1443                 /* fall through */
1444         case NL80211_IFTYPE_STATION:
1445                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1446                 ieee80211_sta_setup_sdata(sdata);
1447                 break;
1448         case NL80211_IFTYPE_OCB:
1449                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1450                 ieee80211_ocb_setup_sdata(sdata);
1451                 break;
1452         case NL80211_IFTYPE_ADHOC:
1453                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1454                 ieee80211_ibss_setup_sdata(sdata);
1455                 break;
1456         case NL80211_IFTYPE_MESH_POINT:
1457                 if (ieee80211_vif_is_mesh(&sdata->vif))
1458                         ieee80211_mesh_init_sdata(sdata);
1459                 break;
1460         case NL80211_IFTYPE_MONITOR:
1461                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1462                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1463                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1464                                       MONITOR_FLAG_OTHER_BSS;
1465                 break;
1466         case NL80211_IFTYPE_WDS:
1467                 sdata->vif.bss_conf.bssid = NULL;
1468                 break;
1469         case NL80211_IFTYPE_NAN:
1470                 idr_init(&sdata->u.nan.function_inst_ids);
1471                 spin_lock_init(&sdata->u.nan.func_lock);
1472                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1473                 break;
1474         case NL80211_IFTYPE_AP_VLAN:
1475         case NL80211_IFTYPE_P2P_DEVICE:
1476                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1477                 break;
1478         case NL80211_IFTYPE_UNSPECIFIED:
1479         case NUM_NL80211_IFTYPES:
1480                 WARN_ON(1);
1481                 break;
1482         }
1483
1484         ieee80211_debugfs_add_netdev(sdata);
1485 }
1486
1487 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1488                                            enum nl80211_iftype type)
1489 {
1490         struct ieee80211_local *local = sdata->local;
1491         int ret, err;
1492         enum nl80211_iftype internal_type = type;
1493         bool p2p = false;
1494
1495         ASSERT_RTNL();
1496
1497         if (!local->ops->change_interface)
1498                 return -EBUSY;
1499
1500         switch (sdata->vif.type) {
1501         case NL80211_IFTYPE_AP:
1502         case NL80211_IFTYPE_STATION:
1503         case NL80211_IFTYPE_ADHOC:
1504         case NL80211_IFTYPE_OCB:
1505                 /*
1506                  * Could maybe also all others here?
1507                  * Just not sure how that interacts
1508                  * with the RX/config path e.g. for
1509                  * mesh.
1510                  */
1511                 break;
1512         default:
1513                 return -EBUSY;
1514         }
1515
1516         switch (type) {
1517         case NL80211_IFTYPE_AP:
1518         case NL80211_IFTYPE_STATION:
1519         case NL80211_IFTYPE_ADHOC:
1520         case NL80211_IFTYPE_OCB:
1521                 /*
1522                  * Could probably support everything
1523                  * but WDS here (WDS do_open can fail
1524                  * under memory pressure, which this
1525                  * code isn't prepared to handle).
1526                  */
1527                 break;
1528         case NL80211_IFTYPE_P2P_CLIENT:
1529                 p2p = true;
1530                 internal_type = NL80211_IFTYPE_STATION;
1531                 break;
1532         case NL80211_IFTYPE_P2P_GO:
1533                 p2p = true;
1534                 internal_type = NL80211_IFTYPE_AP;
1535                 break;
1536         default:
1537                 return -EBUSY;
1538         }
1539
1540         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1541         if (ret)
1542                 return ret;
1543
1544         ieee80211_do_stop(sdata, false);
1545
1546         ieee80211_teardown_sdata(sdata);
1547
1548         ret = drv_change_interface(local, sdata, internal_type, p2p);
1549         if (ret)
1550                 type = ieee80211_vif_type_p2p(&sdata->vif);
1551
1552         /*
1553          * Ignore return value here, there's not much we can do since
1554          * the driver changed the interface type internally already.
1555          * The warnings will hopefully make driver authors fix it :-)
1556          */
1557         ieee80211_check_queues(sdata, type);
1558
1559         ieee80211_setup_sdata(sdata, type);
1560
1561         err = ieee80211_do_open(&sdata->wdev, false);
1562         WARN(err, "type change: do_open returned %d", err);
1563
1564         return ret;
1565 }
1566
1567 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1568                              enum nl80211_iftype type)
1569 {
1570         int ret;
1571
1572         ASSERT_RTNL();
1573
1574         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1575                 return 0;
1576
1577         if (ieee80211_sdata_running(sdata)) {
1578                 ret = ieee80211_runtime_change_iftype(sdata, type);
1579                 if (ret)
1580                         return ret;
1581         } else {
1582                 /* Purge and reset type-dependent state. */
1583                 ieee80211_teardown_sdata(sdata);
1584                 ieee80211_setup_sdata(sdata, type);
1585         }
1586
1587         /* reset some values that shouldn't be kept across type changes */
1588         if (type == NL80211_IFTYPE_STATION)
1589                 sdata->u.mgd.use_4addr = false;
1590
1591         return 0;
1592 }
1593
1594 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1595                                        u8 *perm_addr, enum nl80211_iftype type)
1596 {
1597         struct ieee80211_sub_if_data *sdata;
1598         u64 mask, start, addr, val, inc;
1599         u8 *m;
1600         u8 tmp_addr[ETH_ALEN];
1601         int i;
1602
1603         /* default ... something at least */
1604         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1605
1606         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1607             local->hw.wiphy->n_addresses <= 1)
1608                 return;
1609
1610         mutex_lock(&local->iflist_mtx);
1611
1612         switch (type) {
1613         case NL80211_IFTYPE_MONITOR:
1614                 /* doesn't matter */
1615                 break;
1616         case NL80211_IFTYPE_WDS:
1617         case NL80211_IFTYPE_AP_VLAN:
1618                 /* match up with an AP interface */
1619                 list_for_each_entry(sdata, &local->interfaces, list) {
1620                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1621                                 continue;
1622                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1623                         break;
1624                 }
1625                 /* keep default if no AP interface present */
1626                 break;
1627         case NL80211_IFTYPE_P2P_CLIENT:
1628         case NL80211_IFTYPE_P2P_GO:
1629                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1630                         list_for_each_entry(sdata, &local->interfaces, list) {
1631                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1632                                         continue;
1633                                 if (!ieee80211_sdata_running(sdata))
1634                                         continue;
1635                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1636                                 goto out_unlock;
1637                         }
1638                 }
1639                 /* fall through */
1640         default:
1641                 /* assign a new address if possible -- try n_addresses first */
1642                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1643                         bool used = false;
1644
1645                         list_for_each_entry(sdata, &local->interfaces, list) {
1646                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1647                                                      sdata->vif.addr)) {
1648                                         used = true;
1649                                         break;
1650                                 }
1651                         }
1652
1653                         if (!used) {
1654                                 memcpy(perm_addr,
1655                                        local->hw.wiphy->addresses[i].addr,
1656                                        ETH_ALEN);
1657                                 break;
1658                         }
1659                 }
1660
1661                 /* try mask if available */
1662                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1663                         break;
1664
1665                 m = local->hw.wiphy->addr_mask;
1666                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1667                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1668                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1669
1670                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1671                         /* not a contiguous mask ... not handled now! */
1672                         pr_info("not contiguous\n");
1673                         break;
1674                 }
1675
1676                 /*
1677                  * Pick address of existing interface in case user changed
1678                  * MAC address manually, default to perm_addr.
1679                  */
1680                 m = local->hw.wiphy->perm_addr;
1681                 list_for_each_entry(sdata, &local->interfaces, list) {
1682                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1683                                 continue;
1684                         m = sdata->vif.addr;
1685                         break;
1686                 }
1687                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1688                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1689                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1690
1691                 inc = 1ULL<<__ffs64(mask);
1692                 val = (start & mask);
1693                 addr = (start & ~mask) | (val & mask);
1694                 do {
1695                         bool used = false;
1696
1697                         tmp_addr[5] = addr >> 0*8;
1698                         tmp_addr[4] = addr >> 1*8;
1699                         tmp_addr[3] = addr >> 2*8;
1700                         tmp_addr[2] = addr >> 3*8;
1701                         tmp_addr[1] = addr >> 4*8;
1702                         tmp_addr[0] = addr >> 5*8;
1703
1704                         val += inc;
1705
1706                         list_for_each_entry(sdata, &local->interfaces, list) {
1707                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1708                                         used = true;
1709                                         break;
1710                                 }
1711                         }
1712
1713                         if (!used) {
1714                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1715                                 break;
1716                         }
1717                         addr = (start & ~mask) | (val & mask);
1718                 } while (addr != start);
1719
1720                 break;
1721         }
1722
1723  out_unlock:
1724         mutex_unlock(&local->iflist_mtx);
1725 }
1726
1727 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1728                      unsigned char name_assign_type,
1729                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1730                      struct vif_params *params)
1731 {
1732         struct net_device *ndev = NULL;
1733         struct ieee80211_sub_if_data *sdata = NULL;
1734         struct txq_info *txqi;
1735         void (*if_setup)(struct net_device *dev);
1736         int ret, i;
1737         int txqs = 1;
1738
1739         ASSERT_RTNL();
1740
1741         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1742                 struct wireless_dev *wdev;
1743
1744                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1745                                 GFP_KERNEL);
1746                 if (!sdata)
1747                         return -ENOMEM;
1748                 wdev = &sdata->wdev;
1749
1750                 sdata->dev = NULL;
1751                 strlcpy(sdata->name, name, IFNAMSIZ);
1752                 ieee80211_assign_perm_addr(local, wdev->address, type);
1753                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1754         } else {
1755                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1756                                  sizeof(void *));
1757                 int txq_size = 0;
1758
1759                 if (local->ops->wake_tx_queue &&
1760                     type != NL80211_IFTYPE_AP_VLAN &&
1761                     (type != NL80211_IFTYPE_MONITOR ||
1762                      (params->flags & MONITOR_FLAG_ACTIVE)))
1763                         txq_size += sizeof(struct txq_info) +
1764                                     local->hw.txq_data_size;
1765
1766                 if (local->ops->wake_tx_queue)
1767                         if_setup = ieee80211_if_setup_no_queue;
1768                 else
1769                         if_setup = ieee80211_if_setup;
1770
1771                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1772                         txqs = IEEE80211_NUM_ACS;
1773
1774                 ndev = alloc_netdev_mqs(size + txq_size,
1775                                         name, name_assign_type,
1776                                         if_setup, txqs, 1);
1777                 if (!ndev)
1778                         return -ENOMEM;
1779                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1780
1781                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1782                 if (!ndev->tstats) {
1783                         free_netdev(ndev);
1784                         return -ENOMEM;
1785                 }
1786
1787                 ndev->needed_headroom = local->tx_headroom +
1788                                         4*6 /* four MAC addresses */
1789                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1790                                         + 6 /* mesh */
1791                                         + 8 /* rfc1042/bridge tunnel */
1792                                         - ETH_HLEN /* ethernet hard_header_len */
1793                                         + IEEE80211_ENCRYPT_HEADROOM;
1794                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1795
1796                 ret = dev_alloc_name(ndev, ndev->name);
1797                 if (ret < 0) {
1798                         ieee80211_if_free(ndev);
1799                         free_netdev(ndev);
1800                         return ret;
1801                 }
1802
1803                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1804                 if (is_valid_ether_addr(params->macaddr))
1805                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1806                 else
1807                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1808                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1809
1810                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1811                 sdata = netdev_priv(ndev);
1812                 ndev->ieee80211_ptr = &sdata->wdev;
1813                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1814                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1815
1816                 if (txq_size) {
1817                         txqi = netdev_priv(ndev) + size;
1818                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1819                 }
1820
1821                 sdata->dev = ndev;
1822         }
1823
1824         /* initialise type-independent data */
1825         sdata->wdev.wiphy = local->hw.wiphy;
1826         sdata->local = local;
1827
1828         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1829                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1830
1831         INIT_LIST_HEAD(&sdata->key_list);
1832
1833         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1834                           ieee80211_dfs_cac_timer_work);
1835         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1836                           ieee80211_delayed_tailroom_dec);
1837
1838         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1839                 struct ieee80211_supported_band *sband;
1840                 sband = local->hw.wiphy->bands[i];
1841                 sdata->rc_rateidx_mask[i] =
1842                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1843                 if (sband) {
1844                         __le16 cap;
1845                         u16 *vht_rate_mask;
1846
1847                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1848                                sband->ht_cap.mcs.rx_mask,
1849                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1850
1851                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1852                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1853                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1854                 } else {
1855                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1856                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1857                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1858                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1859                 }
1860         }
1861
1862         ieee80211_set_default_queues(sdata);
1863
1864         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1865         sdata->user_power_level = local->user_power_level;
1866
1867         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1868
1869         /* setup type-dependent data */
1870         ieee80211_setup_sdata(sdata, type);
1871
1872         if (ndev) {
1873                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1874                 if (type == NL80211_IFTYPE_STATION)
1875                         sdata->u.mgd.use_4addr = params->use_4addr;
1876
1877                 ndev->features |= local->hw.netdev_features;
1878
1879                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1880
1881                 /* MTU range: 256 - 2304 */
1882                 ndev->min_mtu = 256;
1883                 ndev->max_mtu = IEEE80211_MAX_DATA_LEN;
1884
1885                 ret = register_netdevice(ndev);
1886                 if (ret) {
1887                         free_netdev(ndev);
1888                         return ret;
1889                 }
1890         }
1891
1892         mutex_lock(&local->iflist_mtx);
1893         list_add_tail_rcu(&sdata->list, &local->interfaces);
1894         mutex_unlock(&local->iflist_mtx);
1895
1896         if (new_wdev)
1897                 *new_wdev = &sdata->wdev;
1898
1899         return 0;
1900 }
1901
1902 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1903 {
1904         ASSERT_RTNL();
1905
1906         mutex_lock(&sdata->local->iflist_mtx);
1907         list_del_rcu(&sdata->list);
1908         mutex_unlock(&sdata->local->iflist_mtx);
1909
1910         synchronize_rcu();
1911
1912         if (sdata->dev) {
1913                 unregister_netdevice(sdata->dev);
1914         } else {
1915                 cfg80211_unregister_wdev(&sdata->wdev);
1916                 ieee80211_teardown_sdata(sdata);
1917                 kfree(sdata);
1918         }
1919 }
1920
1921 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1922 {
1923         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1924                 return;
1925         ieee80211_do_stop(sdata, true);
1926 }
1927
1928 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1929 {
1930         struct ieee80211_sub_if_data *sdata, *tmp;
1931         LIST_HEAD(unreg_list);
1932         LIST_HEAD(wdev_list);
1933
1934         ASSERT_RTNL();
1935
1936         /* Before destroying the interfaces, make sure they're all stopped so
1937          * that the hardware is stopped. Otherwise, the driver might still be
1938          * iterating the interfaces during the shutdown, e.g. from a worker
1939          * or from RX processing or similar, and if it does so (using atomic
1940          * iteration) while we're manipulating the list, the iteration will
1941          * crash.
1942          *
1943          * After this, the hardware should be stopped and the driver should
1944          * have stopped all of its activities, so that we can do RCU-unaware
1945          * manipulations of the interface list below.
1946          */
1947         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1948
1949         WARN(local->open_count, "%s: open count remains %d\n",
1950              wiphy_name(local->hw.wiphy), local->open_count);
1951
1952         mutex_lock(&local->iflist_mtx);
1953         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1954                 list_del(&sdata->list);
1955
1956                 if (sdata->dev)
1957                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1958                 else
1959                         list_add(&sdata->list, &wdev_list);
1960         }
1961         mutex_unlock(&local->iflist_mtx);
1962         unregister_netdevice_many(&unreg_list);
1963
1964         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1965                 list_del(&sdata->list);
1966                 cfg80211_unregister_wdev(&sdata->wdev);
1967                 kfree(sdata);
1968         }
1969 }
1970
1971 static int netdev_notify(struct notifier_block *nb,
1972                          unsigned long state, void *ptr)
1973 {
1974         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1975         struct ieee80211_sub_if_data *sdata;
1976
1977         if (state != NETDEV_CHANGENAME)
1978                 return NOTIFY_DONE;
1979
1980         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1981                 return NOTIFY_DONE;
1982
1983         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1984                 return NOTIFY_DONE;
1985
1986         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1987         memcpy(sdata->name, dev->name, IFNAMSIZ);
1988         ieee80211_debugfs_rename_netdev(sdata);
1989
1990         return NOTIFY_OK;
1991 }
1992
1993 static struct notifier_block mac80211_netdev_notifier = {
1994         .notifier_call = netdev_notify,
1995 };
1996
1997 int ieee80211_iface_init(void)
1998 {
1999         return register_netdevice_notifier(&mac80211_netdev_notifier);
2000 }
2001
2002 void ieee80211_iface_exit(void)
2003 {
2004         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2005 }
2006
2007 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2008 {
2009         if (sdata->vif.type == NL80211_IFTYPE_AP)
2010                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2011         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2012                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2013 }
2014
2015 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2016 {
2017         if (sdata->vif.type == NL80211_IFTYPE_AP)
2018                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2019         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2020                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2021 }