net/mac80211/iface.c

   1 /*
   2  * Interface handling
   3  *
   4  * Copyright 2002-2005, Instant802 Networks, Inc.
   5  * Copyright 2005-2006, Devicescape Software, Inc.
   6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   8  * Copyright 2013-2014  Intel Mobile Communications GmbH
   9  *
  10  * This program is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU General Public License version 2 as
  12  * published by the Free Software Foundation.
  13  */
  14 #include <linux/slab.h>
  15 #include <linux/kernel.h>
  16 #include <linux/if_arp.h>
  17 #include <linux/netdevice.h>
  18 #include <linux/rtnetlink.h>
  19 #include <net/mac80211.h>
  20 #include <net/ieee80211_radiotap.h>
  21 #include "ieee80211_i.h"
  22 #include "sta_info.h"
  23 #include "debugfs_netdev.h"
  24 #include "mesh.h"
  25 #include "led.h"
  26 #include "driver-ops.h"
  27 #include "wme.h"
  28 #include "rate.h"
  29
  30 /**
  31  * DOC: Interface list locking
  32  *
  33  * The interface list in each struct ieee80211_local is protected
  34  * three-fold:
  35  *
  36  * (1) modifications may only be done under the RTNL
  37  * (2) modifications and readers are protected against each other by
  38  *     the iflist_mtx.
  39  * (3) modifications are done in an RCU manner so atomic readers
  40  *     can traverse the list in RCU-safe blocks.
  41  *
  42  * As a consequence, reads (traversals) of the list can be protected
  43  * by either the RTNL, the iflist_mtx or RCU.
  44  */
  45
  46 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  47 {
  48         struct ieee80211_chanctx_conf *chanctx_conf;
  49         int power;
  50
  51         rcu_read_lock();
  52         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  53         if (!chanctx_conf) {
  54                 rcu_read_unlock();
  55                 return false;
  56         }
  57
  58         power = ieee80211_chandef_max_power(&chanctx_conf->def);
  59         rcu_read_unlock();
  60
  61         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  62                 power = min(power, sdata->user_power_level);
  63
  64         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  65                 power = min(power, sdata->ap_power_level);
  66
  67         if (power != sdata->vif.bss_conf.txpower) {
  68                 sdata->vif.bss_conf.txpower = power;
  69                 ieee80211_hw_config(sdata->local, 0);
  70                 return true;
  71         }
  72
  73         return false;
  74 }
  75
  76 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
  77                               bool update_bss)
  78 {
  79         if (__ieee80211_recalc_txpower(sdata) || update_bss)
  80                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  81 }
  82
  83 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
  84 {
  85         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  86                 return 0;
  87
  88         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  89         return IEEE80211_CONF_CHANGE_IDLE;
  90 }
  91
  92 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  93 {
  94         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  95                 return 0;
  96
  97         ieee80211_flush_queues(local, NULL, false);
  98
  99         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 100         return IEEE80211_CONF_CHANGE_IDLE;
 101 }
 102
 103 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
 104                                    bool force_active)
 105 {
 106         bool working, scanning, active;
 107         unsigned int led_trig_start = 0, led_trig_stop = 0;
 108
 109         lockdep_assert_held(&local->mtx);
 110
 111         active = force_active ||
 112                  !list_empty(&local->chanctx_list) ||
 113                  local->monitors;
 114
 115         working = !local->ops->remain_on_channel &&
 116                   !list_empty(&local->roc_list);
 117
 118         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 119                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 120
 121         if (working || scanning)
 122                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 123         else
 124                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 125
 126         if (active)
 127                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 128         else
 129                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 130
 131         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 132
 133         if (working || scanning || active)
 134                 return __ieee80211_idle_off(local);
 135         return __ieee80211_idle_on(local);
 136 }
 137
 138 u32 ieee80211_idle_off(struct ieee80211_local *local)
 139 {
 140         return __ieee80211_recalc_idle(local, true);
 141 }
 142
 143 void ieee80211_recalc_idle(struct ieee80211_local *local)
 144 {
 145         u32 change = __ieee80211_recalc_idle(local, false);
 146         if (change)
 147                 ieee80211_hw_config(local, change);
 148 }
 149
 150 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 151 {
 152         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
 153                 return -EINVAL;
 154
 155         dev->mtu = new_mtu;
 156         return 0;
 157 }
 158
 159 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 160                                 bool check_dup)
 161 {
 162         struct ieee80211_local *local = sdata->local;
 163         struct ieee80211_sub_if_data *iter;
 164         u64 new, mask, tmp;
 165         u8 *m;
 166         int ret = 0;
 167
 168         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 169                 return 0;
 170
 171         m = addr;
 172         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 173                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 174                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 175
 176         m = local->hw.wiphy->addr_mask;
 177         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 178                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 179                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 180
 181         if (!check_dup)
 182                 return ret;
 183
 184         mutex_lock(&local->iflist_mtx);
 185         list_for_each_entry(iter, &local->interfaces, list) {
 186                 if (iter == sdata)
 187                         continue;
 188
 189                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 190                     !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 191                         continue;
 192
 193                 m = iter->vif.addr;
 194                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 195                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 196                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 197
 198                 if ((new & ~mask) != (tmp & ~mask)) {
 199                         ret = -EINVAL;
 200                         break;
 201                 }
 202         }
 203         mutex_unlock(&local->iflist_mtx);
 204
 205         return ret;
 206 }
 207
 208 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 209 {
 210         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 211         struct sockaddr *sa = addr;
 212         bool check_dup = true;
 213         int ret;
 214
 215         if (ieee80211_sdata_running(sdata))
 216                 return -EBUSY;
 217
 218         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 219             !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 220                 check_dup = false;
 221
 222         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 223         if (ret)
 224                 return ret;
 225
 226         ret = eth_mac_addr(dev, sa);
 227
 228         if (ret == 0)
 229                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 230
 231         return ret;
 232 }
 233
 234 static inline int identical_mac_addr_allowed(int type1, int type2)
 235 {
 236         return type1 == NL80211_IFTYPE_MONITOR ||
 237                 type2 == NL80211_IFTYPE_MONITOR ||
 238                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 239                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 240                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 241                 (type1 == NL80211_IFTYPE_WDS &&
 242                         (type2 == NL80211_IFTYPE_WDS ||
 243                          type2 == NL80211_IFTYPE_AP)) ||
 244                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 245                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 246                         (type2 == NL80211_IFTYPE_AP ||
 247                          type2 == NL80211_IFTYPE_AP_VLAN));
 248 }
 249
 250 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 251                                             enum nl80211_iftype iftype)
 252 {
 253         struct ieee80211_local *local = sdata->local;
 254         struct ieee80211_sub_if_data *nsdata;
 255         int ret;
 256
 257         ASSERT_RTNL();
 258
 259         /* we hold the RTNL here so can safely walk the list */
 260         list_for_each_entry(nsdata, &local->interfaces, list) {
 261                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 262                         /*
 263                          * Only OCB and monitor mode may coexist
 264                          */
 265                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
 266                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
 267                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 268                              nsdata->vif.type == NL80211_IFTYPE_OCB))
 269                                 return -EBUSY;
 270
 271                         /*
 272                          * Allow only a single IBSS interface to be up at any
 273                          * time. This is restricted because beacon distribution
 274                          * cannot work properly if both are in the same IBSS.
 275                          *
 276                          * To remove this restriction we'd have to disallow them
 277                          * from setting the same SSID on different IBSS interfaces
 278                          * belonging to the same hardware. Then, however, we're
 279                          * faced with having to adopt two different TSF timers...
 280                          */
 281                         if (iftype == NL80211_IFTYPE_ADHOC &&
 282                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 283                                 return -EBUSY;
 284                         /*
 285                          * will not add another interface while any channel
 286                          * switch is active.
 287                          */
 288                         if (nsdata->vif.csa_active)
 289                                 return -EBUSY;
 290
 291                         /*
 292                          * The remaining checks are only performed for interfaces
 293                          * with the same MAC address.
 294                          */
 295                         if (!ether_addr_equal(sdata->vif.addr,
 296                                               nsdata->vif.addr))
 297                                 continue;
 298
 299                         /*
 300                          * check whether it may have the same address
 301                          */
 302                         if (!identical_mac_addr_allowed(iftype,
 303                                                         nsdata->vif.type))
 304                                 return -ENOTUNIQ;
 305
 306                         /*
 307                          * can only add VLANs to enabled APs
 308                          */
 309                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 310                             nsdata->vif.type == NL80211_IFTYPE_AP)
 311                                 sdata->bss = &nsdata->u.ap;
 312                 }
 313         }
 314
 315         mutex_lock(&local->chanctx_mtx);
 316         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
 317         mutex_unlock(&local->chanctx_mtx);
 318         return ret;
 319 }
 320
 321 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 322                                   enum nl80211_iftype iftype)
 323 {
 324         int n_queues = sdata->local->hw.queues;
 325         int i;
 326
 327         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 328                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 329                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 330                                          IEEE80211_INVAL_HW_QUEUE))
 331                                 return -EINVAL;
 332                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 333                                          n_queues))
 334                                 return -EINVAL;
 335                 }
 336         }
 337
 338         if ((iftype != NL80211_IFTYPE_AP &&
 339              iftype != NL80211_IFTYPE_P2P_GO &&
 340              iftype != NL80211_IFTYPE_MESH_POINT) ||
 341             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
 342                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 343                 return 0;
 344         }
 345
 346         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 347                 return -EINVAL;
 348
 349         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 350                 return -EINVAL;
 351
 352         return 0;
 353 }
 354
 355 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 356                                     const int offset)
 357 {
 358         struct ieee80211_local *local = sdata->local;
 359         u32 flags = sdata->u.mntr_flags;
 360
 361 #define ADJUST(_f, _s)  do {                                    \
 362         if (flags & MONITOR_FLAG_##_f)                          \
 363                 local->fif_##_s += offset;                      \
 364         } while (0)
 365
 366         ADJUST(FCSFAIL, fcsfail);
 367         ADJUST(PLCPFAIL, plcpfail);
 368         ADJUST(CONTROL, control);
 369         ADJUST(CONTROL, pspoll);
 370         ADJUST(OTHER_BSS, other_bss);
 371
 372 #undef ADJUST
 373 }
 374
 375 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 376 {
 377         struct ieee80211_local *local = sdata->local;
 378         int i;
 379
 380         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 381                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
 382                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 383                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 384                         sdata->vif.hw_queue[i] = i;
 385                 else
 386                         sdata->vif.hw_queue[i] = 0;
 387         }
 388         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 389 }
 390
 391 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 392 {
 393         struct ieee80211_sub_if_data *sdata;
 394         int ret;
 395
 396         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 397                 return 0;
 398
 399         ASSERT_RTNL();
 400
 401         if (local->monitor_sdata)
 402                 return 0;
 403
 404         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 405         if (!sdata)
 406                 return -ENOMEM;
 407
 408         /* set up data */
 409         sdata->local = local;
 410         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 411         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 412                  wiphy_name(local->hw.wiphy));
 413         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
 414
 415         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 416
 417         ieee80211_set_default_queues(sdata);
 418
 419         ret = drv_add_interface(local, sdata);
 420         if (WARN_ON(ret)) {
 421                 /* ok .. stupid driver, it asked for this! */
 422                 kfree(sdata);
 423                 return ret;
 424         }
 425
 426         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 427         if (ret) {
 428                 kfree(sdata);
 429                 return ret;
 430         }
 431
 432         mutex_lock(&local->iflist_mtx);
 433         rcu_assign_pointer(local->monitor_sdata, sdata);
 434         mutex_unlock(&local->iflist_mtx);
 435
 436         mutex_lock(&local->mtx);
 437         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 438                                         IEEE80211_CHANCTX_EXCLUSIVE);
 439         mutex_unlock(&local->mtx);
 440         if (ret) {
 441                 mutex_lock(&local->iflist_mtx);
 442                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
 443                 mutex_unlock(&local->iflist_mtx);
 444                 synchronize_net();
 445                 drv_remove_interface(local, sdata);
 446                 kfree(sdata);
 447                 return ret;
 448         }
 449
 450         return 0;
 451 }
 452
 453 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 454 {
 455         struct ieee80211_sub_if_data *sdata;
 456
 457         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 458                 return;
 459
 460         ASSERT_RTNL();
 461
 462         mutex_lock(&local->iflist_mtx);
 463
 464         sdata = rcu_dereference_protected(local->monitor_sdata,
 465                                           lockdep_is_held(&local->iflist_mtx));
 466         if (!sdata) {
 467                 mutex_unlock(&local->iflist_mtx);
 468                 return;
 469         }
 470
 471         RCU_INIT_POINTER(local->monitor_sdata, NULL);
 472         mutex_unlock(&local->iflist_mtx);
 473
 474         synchronize_net();
 475
 476         mutex_lock(&local->mtx);
 477         ieee80211_vif_release_channel(sdata);
 478         mutex_unlock(&local->mtx);
 479
 480         drv_remove_interface(local, sdata);
 481
 482         kfree(sdata);
 483 }
 484
 485 /*
 486  * NOTE: Be very careful when changing this function, it must NOT return
 487  * an error on interface type changes that have been pre-checked, so most
 488  * checks should be in ieee80211_check_concurrent_iface.
 489  */
 490 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 491 {
 492         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 493         struct net_device *dev = wdev->netdev;
 494         struct ieee80211_local *local = sdata->local;
 495         struct sta_info *sta;
 496         u32 changed = 0;
 497         int res;
 498         u32 hw_reconf_flags = 0;
 499
 500         switch (sdata->vif.type) {
 501         case NL80211_IFTYPE_WDS:
 502                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 503                         return -ENOLINK;
 504                 break;
 505         case NL80211_IFTYPE_AP_VLAN: {
 506                 struct ieee80211_sub_if_data *master;
 507
 508                 if (!sdata->bss)
 509                         return -ENOLINK;
 510
 511                 mutex_lock(&local->mtx);
 512                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 513                 mutex_unlock(&local->mtx);
 514
 515                 master = container_of(sdata->bss,
 516                                       struct ieee80211_sub_if_data, u.ap);
 517                 sdata->control_port_protocol =
 518                         master->control_port_protocol;
 519                 sdata->control_port_no_encrypt =
 520                         master->control_port_no_encrypt;
 521                 sdata->vif.cab_queue = master->vif.cab_queue;
 522                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
 523                        sizeof(sdata->vif.hw_queue));
 524                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
 525                 break;
 526                 }
 527         case NL80211_IFTYPE_AP:
 528                 sdata->bss = &sdata->u.ap;
 529                 break;
 530         case NL80211_IFTYPE_MESH_POINT:
 531         case NL80211_IFTYPE_STATION:
 532         case NL80211_IFTYPE_MONITOR:
 533         case NL80211_IFTYPE_ADHOC:
 534         case NL80211_IFTYPE_P2P_DEVICE:
 535         case NL80211_IFTYPE_OCB:
 536                 /* no special treatment */
 537                 break;
 538         case NL80211_IFTYPE_UNSPECIFIED:
 539         case NUM_NL80211_IFTYPES:
 540         case NL80211_IFTYPE_P2P_CLIENT:
 541         case NL80211_IFTYPE_P2P_GO:
 542                 /* cannot happen */
 543                 WARN_ON(1);
 544                 break;
 545         }
 546
 547         if (local->open_count == 0) {
 548                 res = drv_start(local);
 549                 if (res)
 550                         goto err_del_bss;
 551                 /* we're brought up, everything changes */
 552                 hw_reconf_flags = ~0;
 553                 ieee80211_led_radio(local, true);
 554                 ieee80211_mod_tpt_led_trig(local,
 555                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 556         }
 557
 558         /*
 559          * Copy the hopefully now-present MAC address to
 560          * this interface, if it has the special null one.
 561          */
 562         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 563                 memcpy(dev->dev_addr,
 564                        local->hw.wiphy->perm_addr,
 565                        ETH_ALEN);
 566                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 567
 568                 if (!is_valid_ether_addr(dev->dev_addr)) {
 569                         res = -EADDRNOTAVAIL;
 570                         goto err_stop;
 571                 }
 572         }
 573
 574         switch (sdata->vif.type) {
 575         case NL80211_IFTYPE_AP_VLAN:
 576                 /* no need to tell driver, but set carrier and chanctx */
 577                 if (rtnl_dereference(sdata->bss->beacon)) {
 578                         ieee80211_vif_vlan_copy_chanctx(sdata);
 579                         netif_carrier_on(dev);
 580                 } else {
 581                         netif_carrier_off(dev);
 582                 }
 583                 break;
 584         case NL80211_IFTYPE_MONITOR:
 585                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 586                         local->cooked_mntrs++;
 587                         break;
 588                 }
 589
 590                 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
 591                         res = drv_add_interface(local, sdata);
 592                         if (res)
 593                                 goto err_stop;
 594                 } else if (local->monitors == 0 && local->open_count == 0) {
 595                         res = ieee80211_add_virtual_monitor(local);
 596                         if (res)
 597                                 goto err_stop;
 598                 }
 599
 600                 /* must be before the call to ieee80211_configure_filter */
 601                 local->monitors++;
 602                 if (local->monitors == 1) {
 603                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 604                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 605                 }
 606
 607                 ieee80211_adjust_monitor_flags(sdata, 1);
 608                 ieee80211_configure_filter(local);
 609                 mutex_lock(&local->mtx);
 610                 ieee80211_recalc_idle(local);
 611                 mutex_unlock(&local->mtx);
 612
 613                 netif_carrier_on(dev);
 614                 break;
 615         default:
 616                 if (coming_up) {
 617                         ieee80211_del_virtual_monitor(local);
 618
 619                         res = drv_add_interface(local, sdata);
 620                         if (res)
 621                                 goto err_stop;
 622                         res = ieee80211_check_queues(sdata,
 623                                 ieee80211_vif_type_p2p(&sdata->vif));
 624                         if (res)
 625                                 goto err_del_interface;
 626                 }
 627
 628                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 629                         local->fif_pspoll++;
 630                         local->fif_probe_req++;
 631
 632                         ieee80211_configure_filter(local);
 633                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 634                         local->fif_probe_req++;
 635                 }
 636
 637                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 638                         changed |= ieee80211_reset_erp_info(sdata);
 639                 ieee80211_bss_info_change_notify(sdata, changed);
 640
 641                 switch (sdata->vif.type) {
 642                 case NL80211_IFTYPE_STATION:
 643                 case NL80211_IFTYPE_ADHOC:
 644                 case NL80211_IFTYPE_AP:
 645                 case NL80211_IFTYPE_MESH_POINT:
 646                 case NL80211_IFTYPE_OCB:
 647                         netif_carrier_off(dev);
 648                         break;
 649                 case NL80211_IFTYPE_WDS:
 650                 case NL80211_IFTYPE_P2P_DEVICE:
 651                         break;
 652                 default:
 653                         /* not reached */
 654                         WARN_ON(1);
 655                 }
 656
 657                 /*
 658                  * set default queue parameters so drivers don't
 659                  * need to initialise the hardware if the hardware
 660                  * doesn't start up with sane defaults
 661                  */
 662                 ieee80211_set_wmm_default(sdata, true);
 663         }
 664
 665         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 666
 667         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 668                 /* Create STA entry for the WDS peer */
 669                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 670                                      GFP_KERNEL);
 671                 if (!sta) {
 672                         res = -ENOMEM;
 673                         goto err_del_interface;
 674                 }
 675
 676                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 677                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 678                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 679
 680                 res = sta_info_insert(sta);
 681                 if (res) {
 682                         /* STA has been freed */
 683                         goto err_del_interface;
 684                 }
 685
 686                 rate_control_rate_init(sta);
 687                 netif_carrier_on(dev);
 688         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 689                 rcu_assign_pointer(local->p2p_sdata, sdata);
 690         }
 691
 692         /*
 693          * set_multicast_list will be invoked by the networking core
 694          * which will check whether any increments here were done in
 695          * error and sync them down to the hardware as filter flags.
 696          */
 697         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 698                 atomic_inc(&local->iff_allmultis);
 699
 700         if (coming_up)
 701                 local->open_count++;
 702
 703         if (hw_reconf_flags)
 704                 ieee80211_hw_config(local, hw_reconf_flags);
 705
 706         ieee80211_recalc_ps(local, -1);
 707
 708         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 709             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 710                 /* XXX: for AP_VLAN, actually track AP queues */
 711                 netif_tx_start_all_queues(dev);
 712         } else if (dev) {
 713                 unsigned long flags;
 714                 int n_acs = IEEE80211_NUM_ACS;
 715                 int ac;
 716
 717                 if (local->hw.queues < IEEE80211_NUM_ACS)
 718                         n_acs = 1;
 719
 720                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 721                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 722                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 723                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 724                         for (ac = 0; ac < n_acs; ac++) {
 725                                 int ac_queue = sdata->vif.hw_queue[ac];
 726
 727                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 728                                     skb_queue_empty(&local->pending[ac_queue]))
 729                                         netif_start_subqueue(dev, ac);
 730                         }
 731                 }
 732                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 733         }
 734
 735         return 0;
 736  err_del_interface:
 737         drv_remove_interface(local, sdata);
 738  err_stop:
 739         if (!local->open_count)
 740                 drv_stop(local);
 741  err_del_bss:
 742         sdata->bss = NULL;
 743         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 744                 mutex_lock(&local->mtx);
 745                 list_del(&sdata->u.vlan.list);
 746                 mutex_unlock(&local->mtx);
 747         }
 748         /* might already be clear but that doesn't matter */
 749         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 750         return res;
 751 }
 752
 753 static int ieee80211_open(struct net_device *dev)
 754 {
 755         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 756         int err;
 757
 758         /* fail early if user set an invalid address */
 759         if (!is_valid_ether_addr(dev->dev_addr))
 760                 return -EADDRNOTAVAIL;
 761
 762         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 763         if (err)
 764                 return err;
 765
 766         return ieee80211_do_open(&sdata->wdev, true);
 767 }
 768
 769 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 770                               bool going_down)
 771 {
 772         struct ieee80211_local *local = sdata->local;
 773         unsigned long flags;
 774         struct sk_buff *skb, *tmp;
 775         u32 hw_reconf_flags = 0;
 776         int i, flushed;
 777         struct ps_data *ps;
 778         struct cfg80211_chan_def chandef;
 779         bool cancel_scan;
 780
 781         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 782
 783         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 784         if (cancel_scan)
 785                 ieee80211_scan_cancel(local);
 786
 787         /*
 788          * Stop TX on this interface first.
 789          */
 790         if (sdata->dev)
 791                 netif_tx_stop_all_queues(sdata->dev);
 792
 793         ieee80211_roc_purge(local, sdata);
 794
 795         switch (sdata->vif.type) {
 796         case NL80211_IFTYPE_STATION:
 797                 ieee80211_mgd_stop(sdata);
 798                 break;
 799         case NL80211_IFTYPE_ADHOC:
 800                 ieee80211_ibss_stop(sdata);
 801                 break;
 802         case NL80211_IFTYPE_AP:
 803                 cancel_work_sync(&sdata->u.ap.request_smps_work);
 804                 break;
 805         default:
 806                 break;
 807         }
 808
 809         /*
 810          * Remove all stations associated with this interface.
 811          *
 812          * This must be done before calling ops->remove_interface()
 813          * because otherwise we can later invoke ops->sta_notify()
 814          * whenever the STAs are removed, and that invalidates driver
 815          * assumptions about always getting a vif pointer that is valid
 816          * (because if we remove a STA after ops->remove_interface()
 817          * the driver will have removed the vif info already!)
 818          *
 819          * In WDS mode a station must exist here and be flushed, for
 820          * AP_VLANs stations may exist since there's nothing else that
 821          * would have removed them, but in other modes there shouldn't
 822          * be any stations.
 823          */
 824         flushed = sta_info_flush(sdata);
 825         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
 826                      ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 827                       (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
 828
 829         /* don't count this interface for allmulti while it is down */
 830         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 831                 atomic_dec(&local->iff_allmultis);
 832
 833         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 834                 local->fif_pspoll--;
 835                 local->fif_probe_req--;
 836         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 837                 local->fif_probe_req--;
 838         }
 839
 840         if (sdata->dev) {
 841                 netif_addr_lock_bh(sdata->dev);
 842                 spin_lock_bh(&local->filter_lock);
 843                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 844                                  sdata->dev->addr_len);
 845                 spin_unlock_bh(&local->filter_lock);
 846                 netif_addr_unlock_bh(sdata->dev);
 847         }
 848
 849         del_timer_sync(&local->dynamic_ps_timer);
 850         cancel_work_sync(&local->dynamic_ps_enable_work);
 851
 852         cancel_work_sync(&sdata->recalc_smps);
 853         sdata_lock(sdata);
 854         mutex_lock(&local->mtx);
 855         sdata->vif.csa_active = false;
 856         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 857                 sdata->u.mgd.csa_waiting_bcn = false;
 858         if (sdata->csa_block_tx) {
 859                 ieee80211_wake_vif_queues(local, sdata,
 860                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 861                 sdata->csa_block_tx = false;
 862         }
 863         mutex_unlock(&local->mtx);
 864         sdata_unlock(sdata);
 865
 866         cancel_work_sync(&sdata->csa_finalize_work);
 867
 868         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 869
 870         if (sdata->wdev.cac_started) {
 871                 chandef = sdata->vif.bss_conf.chandef;
 872                 WARN_ON(local->suspended);
 873                 mutex_lock(&local->mtx);
 874                 ieee80211_vif_release_channel(sdata);
 875                 mutex_unlock(&local->mtx);
 876                 cfg80211_cac_event(sdata->dev, &chandef,
 877                                    NL80211_RADAR_CAC_ABORTED,
 878                                    GFP_KERNEL);
 879         }
 880
 881         /* APs need special treatment */
 882         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 883                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 884
 885                 /* down all dependent devices, that is VLANs */
 886                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 887                                          u.vlan.list)
 888                         dev_close(vlan->dev);
 889                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 890         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 891                 /* remove all packets in parent bc_buf pointing to this dev */
 892                 ps = &sdata->bss->ps;
 893
 894                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 895                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 896                         if (skb->dev == sdata->dev) {
 897                                 __skb_unlink(skb, &ps->bc_buf);
 898                                 local->total_ps_buffered--;
 899                                 ieee80211_free_txskb(&local->hw, skb);
 900                         }
 901                 }
 902                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 903         }
 904
 905         if (going_down)
 906                 local->open_count--;
 907
 908         switch (sdata->vif.type) {
 909         case NL80211_IFTYPE_AP_VLAN:
 910                 mutex_lock(&local->mtx);
 911                 list_del(&sdata->u.vlan.list);
 912                 mutex_unlock(&local->mtx);
 913                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 914                 /* see comment in the default case below */
 915                 ieee80211_free_keys(sdata, true);
 916                 /* no need to tell driver */
 917                 break;
 918         case NL80211_IFTYPE_MONITOR:
 919                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 920                         local->cooked_mntrs--;
 921                         break;
 922                 }
 923
 924                 local->monitors--;
 925                 if (local->monitors == 0) {
 926                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 927                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 928                 }
 929
 930                 ieee80211_adjust_monitor_flags(sdata, -1);
 931                 break;
 932         case NL80211_IFTYPE_P2P_DEVICE:
 933                 /* relies on synchronize_rcu() below */
 934                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 935                 /* fall through */
 936         default:
 937                 cancel_work_sync(&sdata->work);
 938                 /*
 939                  * When we get here, the interface is marked down.
 940                  * Free the remaining keys, if there are any
 941                  * (which can happen in AP mode if userspace sets
 942                  * keys before the interface is operating, and maybe
 943                  * also in WDS mode)
 944                  *
 945                  * Force the key freeing to always synchronize_net()
 946                  * to wait for the RX path in case it is using this
 947                  * interface enqueuing frames at this very time on
 948                  * another CPU.
 949                  */
 950                 ieee80211_free_keys(sdata, true);
 951                 skb_queue_purge(&sdata->skb_queue);
 952         }
 953
 954         sdata->bss = NULL;
 955
 956         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 957         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 958                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 959                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 960                         if (info->control.vif == &sdata->vif) {
 961                                 __skb_unlink(skb, &local->pending[i]);
 962                                 ieee80211_free_txskb(&local->hw, skb);
 963                         }
 964                 }
 965         }
 966         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 967
 968         if (sdata->vif.txq) {
 969                 struct txq_info *txqi = to_txq_info(sdata->vif.txq);
 970
 971                 ieee80211_purge_tx_queue(&local->hw, &txqi->queue);
 972                 atomic_set(&sdata->txqs_len[txqi->txq.ac], 0);
 973         }
 974
 975         if (local->open_count == 0)
 976                 ieee80211_clear_tx_pending(local);
 977
 978         /*
 979          * If the interface goes down while suspended, presumably because
 980          * the device was unplugged and that happens before our resume,
 981          * then the driver is already unconfigured and the remainder of
 982          * this function isn't needed.
 983          * XXX: what about WoWLAN? If the device has software state, e.g.
 984          *      memory allocated, it might expect teardown commands from
 985          *      mac80211 here?
 986          */
 987         if (local->suspended) {
 988                 WARN_ON(local->wowlan);
 989                 WARN_ON(rtnl_dereference(local->monitor_sdata));
 990                 return;
 991         }
 992
 993         switch (sdata->vif.type) {
 994         case NL80211_IFTYPE_AP_VLAN:
 995                 break;
 996         case NL80211_IFTYPE_MONITOR:
 997                 if (local->monitors == 0)
 998                         ieee80211_del_virtual_monitor(local);
 999
1000                 mutex_lock(&local->mtx);
1001                 ieee80211_recalc_idle(local);
1002                 mutex_unlock(&local->mtx);
1003
1004                 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
1005                         break;
1006
1007                 /* fall through */
1008         default:
1009                 if (going_down)
1010                         drv_remove_interface(local, sdata);
1011         }
1012
1013         ieee80211_recalc_ps(local, -1);
1014
1015         if (cancel_scan)
1016                 flush_delayed_work(&local->scan_work);
1017
1018         if (local->open_count == 0) {
1019                 ieee80211_stop_device(local);
1020
1021                 /* no reconfiguring after stop! */
1022                 return;
1023         }
1024
1025         /* do after stop to avoid reconfiguring when we stop anyway */
1026         ieee80211_configure_filter(local);
1027         ieee80211_hw_config(local, hw_reconf_flags);
1028
1029         if (local->monitors == local->open_count)
1030                 ieee80211_add_virtual_monitor(local);
1031 }
1032
1033 static int ieee80211_stop(struct net_device *dev)
1034 {
1035         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1036
1037         ieee80211_do_stop(sdata, true);
1038
1039         return 0;
1040 }
1041
1042 static void ieee80211_set_multicast_list(struct net_device *dev)
1043 {
1044         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1045         struct ieee80211_local *local = sdata->local;
1046         int allmulti, sdata_allmulti;
1047
1048         allmulti = !!(dev->flags & IFF_ALLMULTI);
1049         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1050
1051         if (allmulti != sdata_allmulti) {
1052                 if (dev->flags & IFF_ALLMULTI)
1053                         atomic_inc(&local->iff_allmultis);
1054                 else
1055                         atomic_dec(&local->iff_allmultis);
1056                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1057         }
1058
1059         spin_lock_bh(&local->filter_lock);
1060         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1061         spin_unlock_bh(&local->filter_lock);
1062         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1063 }
1064
1065 /*
1066  * Called when the netdev is removed or, by the code below, before
1067  * the interface type changes.
1068  */
1069 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1070 {
1071         int i;
1072
1073         /* free extra data */
1074         ieee80211_free_keys(sdata, false);
1075
1076         ieee80211_debugfs_remove_netdev(sdata);
1077
1078         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1079                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1080         sdata->fragment_next = 0;
1081
1082         if (ieee80211_vif_is_mesh(&sdata->vif))
1083                 mesh_rmc_free(sdata);
1084 }
1085
1086 static void ieee80211_uninit(struct net_device *dev)
1087 {
1088         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1089 }
1090
1091 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1092                                          struct sk_buff *skb,
1093                                          void *accel_priv,
1094                                          select_queue_fallback_t fallback)
1095 {
1096         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1097 }
1098
1099 static struct rtnl_link_stats64 *
1100 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1101 {
1102         int i;
1103
1104         for_each_possible_cpu(i) {
1105                 const struct pcpu_sw_netstats *tstats;
1106                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1107                 unsigned int start;
1108
1109                 tstats = per_cpu_ptr(dev->tstats, i);
1110
1111                 do {
1112                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
1113                         rx_packets = tstats->rx_packets;
1114                         tx_packets = tstats->tx_packets;
1115                         rx_bytes = tstats->rx_bytes;
1116                         tx_bytes = tstats->tx_bytes;
1117                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1118
1119                 stats->rx_packets += rx_packets;
1120                 stats->tx_packets += tx_packets;
1121                 stats->rx_bytes   += rx_bytes;
1122                 stats->tx_bytes   += tx_bytes;
1123         }
1124
1125         return stats;
1126 }
1127
1128 static const struct net_device_ops ieee80211_dataif_ops = {
1129         .ndo_open               = ieee80211_open,
1130         .ndo_stop               = ieee80211_stop,
1131         .ndo_uninit             = ieee80211_uninit,
1132         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1133         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1134         .ndo_change_mtu         = ieee80211_change_mtu,
1135         .ndo_set_mac_address    = ieee80211_change_mac,
1136         .ndo_select_queue       = ieee80211_netdev_select_queue,
1137         .ndo_get_stats64        = ieee80211_get_stats64,
1138 };
1139
1140 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1141                                           struct sk_buff *skb,
1142                                           void *accel_priv,
1143                                           select_queue_fallback_t fallback)
1144 {
1145         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1146         struct ieee80211_local *local = sdata->local;
1147         struct ieee80211_hdr *hdr;
1148         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1149
1150         if (local->hw.queues < IEEE80211_NUM_ACS)
1151                 return 0;
1152
1153         if (skb->len < 4 ||
1154             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1155                 return 0; /* doesn't matter, frame will be dropped */
1156
1157         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1158
1159         return ieee80211_select_queue_80211(sdata, skb, hdr);
1160 }
1161
1162 static const struct net_device_ops ieee80211_monitorif_ops = {
1163         .ndo_open               = ieee80211_open,
1164         .ndo_stop               = ieee80211_stop,
1165         .ndo_uninit             = ieee80211_uninit,
1166         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1167         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1168         .ndo_change_mtu         = ieee80211_change_mtu,
1169         .ndo_set_mac_address    = ieee80211_change_mac,
1170         .ndo_select_queue       = ieee80211_monitor_select_queue,
1171         .ndo_get_stats64        = ieee80211_get_stats64,
1172 };
1173
1174 static void ieee80211_if_free(struct net_device *dev)
1175 {
1176         free_percpu(dev->tstats);
1177         free_netdev(dev);
1178 }
1179
1180 static void ieee80211_if_setup(struct net_device *dev)
1181 {
1182         ether_setup(dev);
1183         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1184         dev->netdev_ops = &ieee80211_dataif_ops;
1185         dev->destructor = ieee80211_if_free;
1186 }
1187
1188 static void ieee80211_iface_work(struct work_struct *work)
1189 {
1190         struct ieee80211_sub_if_data *sdata =
1191                 container_of(work, struct ieee80211_sub_if_data, work);
1192         struct ieee80211_local *local = sdata->local;
1193         struct sk_buff *skb;
1194         struct sta_info *sta;
1195         struct ieee80211_ra_tid *ra_tid;
1196         struct ieee80211_rx_agg *rx_agg;
1197
1198         if (!ieee80211_sdata_running(sdata))
1199                 return;
1200
1201         if (local->scanning)
1202                 return;
1203
1204         if (!ieee80211_can_run_worker(local))
1205                 return;
1206
1207         /* first process frames */
1208         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1209                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1210
1211                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1212                         ra_tid = (void *)&skb->cb;
1213                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1214                                                  ra_tid->tid);
1215                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1216                         ra_tid = (void *)&skb->cb;
1217                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1218                                                 ra_tid->tid);
1219                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1220                         rx_agg = (void *)&skb->cb;
1221                         mutex_lock(&local->sta_mtx);
1222                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1223                         if (sta)
1224                                 __ieee80211_start_rx_ba_session(sta,
1225                                                 0, 0, 0, 1, rx_agg->tid,
1226                                                 IEEE80211_MAX_AMPDU_BUF,
1227                                                 false, true);
1228                         mutex_unlock(&local->sta_mtx);
1229                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1230                         rx_agg = (void *)&skb->cb;
1231                         mutex_lock(&local->sta_mtx);
1232                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1233                         if (sta)
1234                                 __ieee80211_stop_rx_ba_session(sta,
1235                                                         rx_agg->tid,
1236                                                         WLAN_BACK_RECIPIENT, 0,
1237                                                         false);
1238                         mutex_unlock(&local->sta_mtx);
1239                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_TDLS_CHSW) {
1240                         ieee80211_process_tdls_channel_switch(sdata, skb);
1241                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1242                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1243                         int len = skb->len;
1244
1245                         mutex_lock(&local->sta_mtx);
1246                         sta = sta_info_get_bss(sdata, mgmt->sa);
1247                         if (sta) {
1248                                 switch (mgmt->u.action.u.addba_req.action_code) {
1249                                 case WLAN_ACTION_ADDBA_REQ:
1250                                         ieee80211_process_addba_request(
1251                                                         local, sta, mgmt, len);
1252                                         break;
1253                                 case WLAN_ACTION_ADDBA_RESP:
1254                                         ieee80211_process_addba_resp(local, sta,
1255                                                                      mgmt, len);
1256                                         break;
1257                                 case WLAN_ACTION_DELBA:
1258                                         ieee80211_process_delba(sdata, sta,
1259                                                                 mgmt, len);
1260                                         break;
1261                                 default:
1262                                         WARN_ON(1);
1263                                         break;
1264                                 }
1265                         }
1266                         mutex_unlock(&local->sta_mtx);
1267                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1268                         struct ieee80211_hdr *hdr = (void *)mgmt;
1269                         /*
1270                          * So the frame isn't mgmt, but frame_control
1271                          * is at the right place anyway, of course, so
1272                          * the if statement is correct.
1273                          *
1274                          * Warn if we have other data frame types here,
1275                          * they must not get here.
1276                          */
1277                         WARN_ON(hdr->frame_control &
1278                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1279                         WARN_ON(!(hdr->seq_ctrl &
1280                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1281                         /*
1282                          * This was a fragment of a frame, received while
1283                          * a block-ack session was active. That cannot be
1284                          * right, so terminate the session.
1285                          */
1286                         mutex_lock(&local->sta_mtx);
1287                         sta = sta_info_get_bss(sdata, mgmt->sa);
1288                         if (sta) {
1289                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1290                                                 IEEE80211_QOS_CTL_TID_MASK;
1291
1292                                 __ieee80211_stop_rx_ba_session(
1293                                         sta, tid, WLAN_BACK_RECIPIENT,
1294                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1295                                         true);
1296                         }
1297                         mutex_unlock(&local->sta_mtx);
1298                 } else switch (sdata->vif.type) {
1299                 case NL80211_IFTYPE_STATION:
1300                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1301                         break;
1302                 case NL80211_IFTYPE_ADHOC:
1303                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1304                         break;
1305                 case NL80211_IFTYPE_MESH_POINT:
1306                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1307                                 break;
1308                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1309                         break;
1310                 default:
1311                         WARN(1, "frame for unexpected interface type");
1312                         break;
1313                 }
1314
1315                 kfree_skb(skb);
1316         }
1317
1318         /* then other type-dependent work */
1319         switch (sdata->vif.type) {
1320         case NL80211_IFTYPE_STATION:
1321                 ieee80211_sta_work(sdata);
1322                 break;
1323         case NL80211_IFTYPE_ADHOC:
1324                 ieee80211_ibss_work(sdata);
1325                 break;
1326         case NL80211_IFTYPE_MESH_POINT:
1327                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1328                         break;
1329                 ieee80211_mesh_work(sdata);
1330                 break;
1331         case NL80211_IFTYPE_OCB:
1332                 ieee80211_ocb_work(sdata);
1333                 break;
1334         default:
1335                 break;
1336         }
1337 }
1338
1339 static void ieee80211_recalc_smps_work(struct work_struct *work)
1340 {
1341         struct ieee80211_sub_if_data *sdata =
1342                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1343
1344         ieee80211_recalc_smps(sdata);
1345 }
1346
1347 /*
1348  * Helper function to initialise an interface to a specific type.
1349  */
1350 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1351                                   enum nl80211_iftype type)
1352 {
1353         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1354                                                     0xff, 0xff, 0xff};
1355
1356         /* clear type-dependent union */
1357         memset(&sdata->u, 0, sizeof(sdata->u));
1358
1359         /* and set some type-dependent values */
1360         sdata->vif.type = type;
1361         sdata->vif.p2p = false;
1362         sdata->wdev.iftype = type;
1363
1364         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1365         sdata->control_port_no_encrypt = false;
1366         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1367         sdata->vif.bss_conf.idle = true;
1368
1369         sdata->noack_map = 0;
1370
1371         /* only monitor/p2p-device differ */
1372         if (sdata->dev) {
1373                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1374                 sdata->dev->type = ARPHRD_ETHER;
1375         }
1376
1377         skb_queue_head_init(&sdata->skb_queue);
1378         INIT_WORK(&sdata->work, ieee80211_iface_work);
1379         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1380         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1381         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1382         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1383
1384         switch (type) {
1385         case NL80211_IFTYPE_P2P_GO:
1386                 type = NL80211_IFTYPE_AP;
1387                 sdata->vif.type = type;
1388                 sdata->vif.p2p = true;
1389                 /* fall through */
1390         case NL80211_IFTYPE_AP:
1391                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1392                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1393                 INIT_WORK(&sdata->u.ap.request_smps_work,
1394                           ieee80211_request_smps_ap_work);
1395                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1396                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1397                 break;
1398         case NL80211_IFTYPE_P2P_CLIENT:
1399                 type = NL80211_IFTYPE_STATION;
1400                 sdata->vif.type = type;
1401                 sdata->vif.p2p = true;
1402                 /* fall through */
1403         case NL80211_IFTYPE_STATION:
1404                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1405                 ieee80211_sta_setup_sdata(sdata);
1406                 break;
1407         case NL80211_IFTYPE_OCB:
1408                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1409                 ieee80211_ocb_setup_sdata(sdata);
1410                 break;
1411         case NL80211_IFTYPE_ADHOC:
1412                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1413                 ieee80211_ibss_setup_sdata(sdata);
1414                 break;
1415         case NL80211_IFTYPE_MESH_POINT:
1416                 if (ieee80211_vif_is_mesh(&sdata->vif))
1417                         ieee80211_mesh_init_sdata(sdata);
1418                 break;
1419         case NL80211_IFTYPE_MONITOR:
1420                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1421                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1422                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1423                                       MONITOR_FLAG_OTHER_BSS;
1424                 break;
1425         case NL80211_IFTYPE_WDS:
1426                 sdata->vif.bss_conf.bssid = NULL;
1427                 break;
1428         case NL80211_IFTYPE_AP_VLAN:
1429         case NL80211_IFTYPE_P2P_DEVICE:
1430                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1431                 break;
1432         case NL80211_IFTYPE_UNSPECIFIED:
1433         case NUM_NL80211_IFTYPES:
1434                 BUG();
1435                 break;
1436         }
1437
1438         ieee80211_debugfs_add_netdev(sdata);
1439 }
1440
1441 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1442                                            enum nl80211_iftype type)
1443 {
1444         struct ieee80211_local *local = sdata->local;
1445         int ret, err;
1446         enum nl80211_iftype internal_type = type;
1447         bool p2p = false;
1448
1449         ASSERT_RTNL();
1450
1451         if (!local->ops->change_interface)
1452                 return -EBUSY;
1453
1454         switch (sdata->vif.type) {
1455         case NL80211_IFTYPE_AP:
1456         case NL80211_IFTYPE_STATION:
1457         case NL80211_IFTYPE_ADHOC:
1458         case NL80211_IFTYPE_OCB:
1459                 /*
1460                  * Could maybe also all others here?
1461                  * Just not sure how that interacts
1462                  * with the RX/config path e.g. for
1463                  * mesh.
1464                  */
1465                 break;
1466         default:
1467                 return -EBUSY;
1468         }
1469
1470         switch (type) {
1471         case NL80211_IFTYPE_AP:
1472         case NL80211_IFTYPE_STATION:
1473         case NL80211_IFTYPE_ADHOC:
1474         case NL80211_IFTYPE_OCB:
1475                 /*
1476                  * Could probably support everything
1477                  * but WDS here (WDS do_open can fail
1478                  * under memory pressure, which this
1479                  * code isn't prepared to handle).
1480                  */
1481                 break;
1482         case NL80211_IFTYPE_P2P_CLIENT:
1483                 p2p = true;
1484                 internal_type = NL80211_IFTYPE_STATION;
1485                 break;
1486         case NL80211_IFTYPE_P2P_GO:
1487                 p2p = true;
1488                 internal_type = NL80211_IFTYPE_AP;
1489                 break;
1490         default:
1491                 return -EBUSY;
1492         }
1493
1494         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1495         if (ret)
1496                 return ret;
1497
1498         ieee80211_do_stop(sdata, false);
1499
1500         ieee80211_teardown_sdata(sdata);
1501
1502         ret = drv_change_interface(local, sdata, internal_type, p2p);
1503         if (ret)
1504                 type = ieee80211_vif_type_p2p(&sdata->vif);
1505
1506         /*
1507          * Ignore return value here, there's not much we can do since
1508          * the driver changed the interface type internally already.
1509          * The warnings will hopefully make driver authors fix it :-)
1510          */
1511         ieee80211_check_queues(sdata, type);
1512
1513         ieee80211_setup_sdata(sdata, type);
1514
1515         err = ieee80211_do_open(&sdata->wdev, false);
1516         WARN(err, "type change: do_open returned %d", err);
1517
1518         return ret;
1519 }
1520
1521 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1522                              enum nl80211_iftype type)
1523 {
1524         int ret;
1525
1526         ASSERT_RTNL();
1527
1528         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1529                 return 0;
1530
1531         if (ieee80211_sdata_running(sdata)) {
1532                 ret = ieee80211_runtime_change_iftype(sdata, type);
1533                 if (ret)
1534                         return ret;
1535         } else {
1536                 /* Purge and reset type-dependent state. */
1537                 ieee80211_teardown_sdata(sdata);
1538                 ieee80211_setup_sdata(sdata, type);
1539         }
1540
1541         /* reset some values that shouldn't be kept across type changes */
1542         if (type == NL80211_IFTYPE_STATION)
1543                 sdata->u.mgd.use_4addr = false;
1544
1545         return 0;
1546 }
1547
1548 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1549                                        u8 *perm_addr, enum nl80211_iftype type)
1550 {
1551         struct ieee80211_sub_if_data *sdata;
1552         u64 mask, start, addr, val, inc;
1553         u8 *m;
1554         u8 tmp_addr[ETH_ALEN];
1555         int i;
1556
1557         /* default ... something at least */
1558         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1559
1560         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1561             local->hw.wiphy->n_addresses <= 1)
1562                 return;
1563
1564         mutex_lock(&local->iflist_mtx);
1565
1566         switch (type) {
1567         case NL80211_IFTYPE_MONITOR:
1568                 /* doesn't matter */
1569                 break;
1570         case NL80211_IFTYPE_WDS:
1571         case NL80211_IFTYPE_AP_VLAN:
1572                 /* match up with an AP interface */
1573                 list_for_each_entry(sdata, &local->interfaces, list) {
1574                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1575                                 continue;
1576                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1577                         break;
1578                 }
1579                 /* keep default if no AP interface present */
1580                 break;
1581         case NL80211_IFTYPE_P2P_CLIENT:
1582         case NL80211_IFTYPE_P2P_GO:
1583                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1584                         list_for_each_entry(sdata, &local->interfaces, list) {
1585                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1586                                         continue;
1587                                 if (!ieee80211_sdata_running(sdata))
1588                                         continue;
1589                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1590                                 goto out_unlock;
1591                         }
1592                 }
1593                 /* otherwise fall through */
1594         default:
1595                 /* assign a new address if possible -- try n_addresses first */
1596                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1597                         bool used = false;
1598
1599                         list_for_each_entry(sdata, &local->interfaces, list) {
1600                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1601                                                      sdata->vif.addr)) {
1602                                         used = true;
1603                                         break;
1604                                 }
1605                         }
1606
1607                         if (!used) {
1608                                 memcpy(perm_addr,
1609                                        local->hw.wiphy->addresses[i].addr,
1610                                        ETH_ALEN);
1611                                 break;
1612                         }
1613                 }
1614
1615                 /* try mask if available */
1616                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1617                         break;
1618
1619                 m = local->hw.wiphy->addr_mask;
1620                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1621                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1622                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1623
1624                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1625                         /* not a contiguous mask ... not handled now! */
1626                         pr_info("not contiguous\n");
1627                         break;
1628                 }
1629
1630                 /*
1631                  * Pick address of existing interface in case user changed
1632                  * MAC address manually, default to perm_addr.
1633                  */
1634                 m = local->hw.wiphy->perm_addr;
1635                 list_for_each_entry(sdata, &local->interfaces, list) {
1636                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1637                                 continue;
1638                         m = sdata->vif.addr;
1639                         break;
1640                 }
1641                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1642                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1643                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1644
1645                 inc = 1ULL<<__ffs64(mask);
1646                 val = (start & mask);
1647                 addr = (start & ~mask) | (val & mask);
1648                 do {
1649                         bool used = false;
1650
1651                         tmp_addr[5] = addr >> 0*8;
1652                         tmp_addr[4] = addr >> 1*8;
1653                         tmp_addr[3] = addr >> 2*8;
1654                         tmp_addr[2] = addr >> 3*8;
1655                         tmp_addr[1] = addr >> 4*8;
1656                         tmp_addr[0] = addr >> 5*8;
1657
1658                         val += inc;
1659
1660                         list_for_each_entry(sdata, &local->interfaces, list) {
1661                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1662                                         used = true;
1663                                         break;
1664                                 }
1665                         }
1666
1667                         if (!used) {
1668                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1669                                 break;
1670                         }
1671                         addr = (start & ~mask) | (val & mask);
1672                 } while (addr != start);
1673
1674                 break;
1675         }
1676
1677  out_unlock:
1678         mutex_unlock(&local->iflist_mtx);
1679 }
1680
1681 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1682                      unsigned char name_assign_type,
1683                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1684                      struct vif_params *params)
1685 {
1686         struct net_device *ndev = NULL;
1687         struct ieee80211_sub_if_data *sdata = NULL;
1688         struct txq_info *txqi;
1689         int ret, i;
1690         int txqs = 1;
1691
1692         ASSERT_RTNL();
1693
1694         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1695                 struct wireless_dev *wdev;
1696
1697                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1698                                 GFP_KERNEL);
1699                 if (!sdata)
1700                         return -ENOMEM;
1701                 wdev = &sdata->wdev;
1702
1703                 sdata->dev = NULL;
1704                 strlcpy(sdata->name, name, IFNAMSIZ);
1705                 ieee80211_assign_perm_addr(local, wdev->address, type);
1706                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1707         } else {
1708                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1709                                  sizeof(void *));
1710                 int txq_size = 0;
1711
1712                 if (local->ops->wake_tx_queue)
1713                         txq_size += sizeof(struct txq_info) +
1714                                     local->hw.txq_data_size;
1715
1716                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1717                         txqs = IEEE80211_NUM_ACS;
1718
1719                 ndev = alloc_netdev_mqs(size + txq_size,
1720                                         name, name_assign_type,
1721                                         ieee80211_if_setup, txqs, 1);
1722                 if (!ndev)
1723                         return -ENOMEM;
1724                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1725
1726                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1727                 if (!ndev->tstats) {
1728                         free_netdev(ndev);
1729                         return -ENOMEM;
1730                 }
1731
1732                 ndev->needed_headroom = local->tx_headroom +
1733                                         4*6 /* four MAC addresses */
1734                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1735                                         + 6 /* mesh */
1736                                         + 8 /* rfc1042/bridge tunnel */
1737                                         - ETH_HLEN /* ethernet hard_header_len */
1738                                         + IEEE80211_ENCRYPT_HEADROOM;
1739                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1740
1741                 ret = dev_alloc_name(ndev, ndev->name);
1742                 if (ret < 0) {
1743                         free_netdev(ndev);
1744                         return ret;
1745                 }
1746
1747                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1748                 if (params && is_valid_ether_addr(params->macaddr))
1749                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1750                 else
1751                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1752                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1753
1754                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1755                 sdata = netdev_priv(ndev);
1756                 ndev->ieee80211_ptr = &sdata->wdev;
1757                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1758                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1759
1760                 if (txq_size) {
1761                         txqi = netdev_priv(ndev) + size;
1762                         ieee80211_init_tx_queue(sdata, NULL, txqi, 0);
1763                 }
1764
1765                 sdata->dev = ndev;
1766         }
1767
1768         /* initialise type-independent data */
1769         sdata->wdev.wiphy = local->hw.wiphy;
1770         sdata->local = local;
1771
1772         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1773                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1774
1775         INIT_LIST_HEAD(&sdata->key_list);
1776
1777         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1778                           ieee80211_dfs_cac_timer_work);
1779         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1780                           ieee80211_delayed_tailroom_dec);
1781
1782         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1783                 struct ieee80211_supported_band *sband;
1784                 sband = local->hw.wiphy->bands[i];
1785                 sdata->rc_rateidx_mask[i] =
1786                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1787                 if (sband)
1788                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1789                                sband->ht_cap.mcs.rx_mask,
1790                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1791                 else
1792                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1793                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1794         }
1795
1796         ieee80211_set_default_queues(sdata);
1797
1798         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1799         sdata->user_power_level = local->user_power_level;
1800
1801         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1802
1803         /* setup type-dependent data */
1804         ieee80211_setup_sdata(sdata, type);
1805
1806         if (ndev) {
1807                 if (params) {
1808                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1809                         if (type == NL80211_IFTYPE_STATION)
1810                                 sdata->u.mgd.use_4addr = params->use_4addr;
1811                 }
1812
1813                 ndev->features |= local->hw.netdev_features;
1814
1815                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1816
1817                 ret = register_netdevice(ndev);
1818                 if (ret) {
1819                         free_netdev(ndev);
1820                         return ret;
1821                 }
1822         }
1823
1824         mutex_lock(&local->iflist_mtx);
1825         list_add_tail_rcu(&sdata->list, &local->interfaces);
1826         mutex_unlock(&local->iflist_mtx);
1827
1828         if (new_wdev)
1829                 *new_wdev = &sdata->wdev;
1830
1831         return 0;
1832 }
1833
1834 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1835 {
1836         ASSERT_RTNL();
1837
1838         mutex_lock(&sdata->local->iflist_mtx);
1839         list_del_rcu(&sdata->list);
1840         mutex_unlock(&sdata->local->iflist_mtx);
1841
1842         synchronize_rcu();
1843
1844         if (sdata->dev) {
1845                 unregister_netdevice(sdata->dev);
1846         } else {
1847                 cfg80211_unregister_wdev(&sdata->wdev);
1848                 kfree(sdata);
1849         }
1850 }
1851
1852 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1853 {
1854         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1855                 return;
1856         ieee80211_do_stop(sdata, true);
1857         ieee80211_teardown_sdata(sdata);
1858 }
1859
1860 /*
1861  * Remove all interfaces, may only be called at hardware unregistration
1862  * time because it doesn't do RCU-safe list removals.
1863  */
1864 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1865 {
1866         struct ieee80211_sub_if_data *sdata, *tmp;
1867         LIST_HEAD(unreg_list);
1868         LIST_HEAD(wdev_list);
1869
1870         ASSERT_RTNL();
1871
1872         /*
1873          * Close all AP_VLAN interfaces first, as otherwise they
1874          * might be closed while the AP interface they belong to
1875          * is closed, causing unregister_netdevice_many() to crash.
1876          */
1877         list_for_each_entry(sdata, &local->interfaces, list)
1878                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1879                         dev_close(sdata->dev);
1880
1881         mutex_lock(&local->iflist_mtx);
1882         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1883                 list_del(&sdata->list);
1884
1885                 if (sdata->dev)
1886                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1887                 else
1888                         list_add(&sdata->list, &wdev_list);
1889         }
1890         mutex_unlock(&local->iflist_mtx);
1891         unregister_netdevice_many(&unreg_list);
1892
1893         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1894                 list_del(&sdata->list);
1895                 cfg80211_unregister_wdev(&sdata->wdev);
1896                 kfree(sdata);
1897         }
1898 }
1899
1900 static int netdev_notify(struct notifier_block *nb,
1901                          unsigned long state, void *ptr)
1902 {
1903         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1904         struct ieee80211_sub_if_data *sdata;
1905
1906         if (state != NETDEV_CHANGENAME)
1907                 return NOTIFY_DONE;
1908
1909         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1910                 return NOTIFY_DONE;
1911
1912         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1913                 return NOTIFY_DONE;
1914
1915         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1916         memcpy(sdata->name, dev->name, IFNAMSIZ);
1917         ieee80211_debugfs_rename_netdev(sdata);
1918
1919         return NOTIFY_OK;
1920 }
1921
1922 static struct notifier_block mac80211_netdev_notifier = {
1923         .notifier_call = netdev_notify,
1924 };
1925
1926 int ieee80211_iface_init(void)
1927 {
1928         return register_netdevice_notifier(&mac80211_netdev_notifier);
1929 }
1930
1931 void ieee80211_iface_exit(void)
1932 {
1933         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1934 }