kernel/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) ||
  80             (update_bss && ieee80211_sdata_running(sdata)))
  81                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  82 }
  83
  84 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
  85 {
  86         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  87                 return 0;
  88
  89         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  90         return IEEE80211_CONF_CHANGE_IDLE;
  91 }
  92
  93 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  94 {
  95         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  96                 return 0;
  97
  98         ieee80211_flush_queues(local, NULL, false);
  99
 100         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 101         return IEEE80211_CONF_CHANGE_IDLE;
 102 }
 103
 104 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
 105                                    bool force_active)
 106 {
 107         bool working, scanning, active;
 108         unsigned int led_trig_start = 0, led_trig_stop = 0;
 109
 110         lockdep_assert_held(&local->mtx);
 111
 112         active = force_active ||
 113                  !list_empty(&local->chanctx_list) ||
 114                  local->monitors;
 115
 116         working = !local->ops->remain_on_channel &&
 117                   !list_empty(&local->roc_list);
 118
 119         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 120                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 121
 122         if (working || scanning)
 123                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 124         else
 125                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 126
 127         if (active)
 128                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 129         else
 130                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 131
 132         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 133
 134         if (working || scanning || active)
 135                 return __ieee80211_idle_off(local);
 136         return __ieee80211_idle_on(local);
 137 }
 138
 139 u32 ieee80211_idle_off(struct ieee80211_local *local)
 140 {
 141         return __ieee80211_recalc_idle(local, true);
 142 }
 143
 144 void ieee80211_recalc_idle(struct ieee80211_local *local)
 145 {
 146         u32 change = __ieee80211_recalc_idle(local, false);
 147         if (change)
 148                 ieee80211_hw_config(local, change);
 149 }
 150
 151 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 152 {
 153         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
 154                 return -EINVAL;
 155
 156         dev->mtu = new_mtu;
 157         return 0;
 158 }
 159
 160 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 161                                 bool check_dup)
 162 {
 163         struct ieee80211_local *local = sdata->local;
 164         struct ieee80211_sub_if_data *iter;
 165         u64 new, mask, tmp;
 166         u8 *m;
 167         int ret = 0;
 168
 169         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 170                 return 0;
 171
 172         m = addr;
 173         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 174                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 175                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 176
 177         m = local->hw.wiphy->addr_mask;
 178         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 179                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 180                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 181
 182         if (!check_dup)
 183                 return ret;
 184
 185         mutex_lock(&local->iflist_mtx);
 186         list_for_each_entry(iter, &local->interfaces, list) {
 187                 if (iter == sdata)
 188                         continue;
 189
 190                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 191                     !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 192                         continue;
 193
 194                 m = iter->vif.addr;
 195                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 196                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 197                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 198
 199                 if ((new & ~mask) != (tmp & ~mask)) {
 200                         ret = -EINVAL;
 201                         break;
 202                 }
 203         }
 204         mutex_unlock(&local->iflist_mtx);
 205
 206         return ret;
 207 }
 208
 209 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 210 {
 211         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 212         struct sockaddr *sa = addr;
 213         bool check_dup = true;
 214         int ret;
 215
 216         if (ieee80211_sdata_running(sdata))
 217                 return -EBUSY;
 218
 219         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 220             !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 221                 check_dup = false;
 222
 223         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 224         if (ret)
 225                 return ret;
 226
 227         ret = eth_mac_addr(dev, sa);
 228
 229         if (ret == 0)
 230                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 231
 232         return ret;
 233 }
 234
 235 static inline int identical_mac_addr_allowed(int type1, int type2)
 236 {
 237         return type1 == NL80211_IFTYPE_MONITOR ||
 238                 type2 == NL80211_IFTYPE_MONITOR ||
 239                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 240                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 241                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 242                 (type1 == NL80211_IFTYPE_WDS &&
 243                         (type2 == NL80211_IFTYPE_WDS ||
 244                          type2 == NL80211_IFTYPE_AP)) ||
 245                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 246                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 247                         (type2 == NL80211_IFTYPE_AP ||
 248                          type2 == NL80211_IFTYPE_AP_VLAN));
 249 }
 250
 251 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 252                                             enum nl80211_iftype iftype)
 253 {
 254         struct ieee80211_local *local = sdata->local;
 255         struct ieee80211_sub_if_data *nsdata;
 256         int ret;
 257
 258         ASSERT_RTNL();
 259
 260         /* we hold the RTNL here so can safely walk the list */
 261         list_for_each_entry(nsdata, &local->interfaces, list) {
 262                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 263                         /*
 264                          * Only OCB and monitor mode may coexist
 265                          */
 266                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
 267                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
 268                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 269                              nsdata->vif.type == NL80211_IFTYPE_OCB))
 270                                 return -EBUSY;
 271
 272                         /*
 273                          * Allow only a single IBSS interface to be up at any
 274                          * time. This is restricted because beacon distribution
 275                          * cannot work properly if both are in the same IBSS.
 276                          *
 277                          * To remove this restriction we'd have to disallow them
 278                          * from setting the same SSID on different IBSS interfaces
 279                          * belonging to the same hardware. Then, however, we're
 280                          * faced with having to adopt two different TSF timers...
 281                          */
 282                         if (iftype == NL80211_IFTYPE_ADHOC &&
 283                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 284                                 return -EBUSY;
 285                         /*
 286                          * will not add another interface while any channel
 287                          * switch is active.
 288                          */
 289                         if (nsdata->vif.csa_active)
 290                                 return -EBUSY;
 291
 292                         /*
 293                          * The remaining checks are only performed for interfaces
 294                          * with the same MAC address.
 295                          */
 296                         if (!ether_addr_equal(sdata->vif.addr,
 297                                               nsdata->vif.addr))
 298                                 continue;
 299
 300                         /*
 301                          * check whether it may have the same address
 302                          */
 303                         if (!identical_mac_addr_allowed(iftype,
 304                                                         nsdata->vif.type))
 305                                 return -ENOTUNIQ;
 306
 307                         /*
 308                          * can only add VLANs to enabled APs
 309                          */
 310                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 311                             nsdata->vif.type == NL80211_IFTYPE_AP)
 312                                 sdata->bss = &nsdata->u.ap;
 313                 }
 314         }
 315
 316         mutex_lock(&local->chanctx_mtx);
 317         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
 318         mutex_unlock(&local->chanctx_mtx);
 319         return ret;
 320 }
 321
 322 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 323                                   enum nl80211_iftype iftype)
 324 {
 325         int n_queues = sdata->local->hw.queues;
 326         int i;
 327
 328         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 329                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 330                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 331                                          IEEE80211_INVAL_HW_QUEUE))
 332                                 return -EINVAL;
 333                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 334                                          n_queues))
 335                                 return -EINVAL;
 336                 }
 337         }
 338
 339         if ((iftype != NL80211_IFTYPE_AP &&
 340              iftype != NL80211_IFTYPE_P2P_GO &&
 341              iftype != NL80211_IFTYPE_MESH_POINT) ||
 342             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
 343                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 344                 return 0;
 345         }
 346
 347         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 348                 return -EINVAL;
 349
 350         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 351                 return -EINVAL;
 352
 353         return 0;
 354 }
 355
 356 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 357                                     const int offset)
 358 {
 359         struct ieee80211_local *local = sdata->local;
 360         u32 flags = sdata->u.mntr_flags;
 361
 362 #define ADJUST(_f, _s)  do {                                    \
 363         if (flags & MONITOR_FLAG_##_f)                          \
 364                 local->fif_##_s += offset;                      \
 365         } while (0)
 366
 367         ADJUST(FCSFAIL, fcsfail);
 368         ADJUST(PLCPFAIL, plcpfail);
 369         ADJUST(CONTROL, control);
 370         ADJUST(CONTROL, pspoll);
 371         ADJUST(OTHER_BSS, other_bss);
 372
 373 #undef ADJUST
 374 }
 375
 376 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 377 {
 378         struct ieee80211_local *local = sdata->local;
 379         int i;
 380
 381         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 382                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
 383                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 384                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 385                         sdata->vif.hw_queue[i] = i;
 386                 else
 387                         sdata->vif.hw_queue[i] = 0;
 388         }
 389         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 390 }
 391
 392 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 393 {
 394         struct ieee80211_sub_if_data *sdata;
 395         int ret;
 396
 397         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 398                 return 0;
 399
 400         ASSERT_RTNL();
 401
 402         if (local->monitor_sdata)
 403                 return 0;
 404
 405         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 406         if (!sdata)
 407                 return -ENOMEM;
 408
 409         /* set up data */
 410         sdata->local = local;
 411         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 412         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 413                  wiphy_name(local->hw.wiphy));
 414         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
 415
 416         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 417
 418         ieee80211_set_default_queues(sdata);
 419
 420         ret = drv_add_interface(local, sdata);
 421         if (WARN_ON(ret)) {
 422                 /* ok .. stupid driver, it asked for this! */
 423                 kfree(sdata);
 424                 return ret;
 425         }
 426
 427         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 428         if (ret) {
 429                 kfree(sdata);
 430                 return ret;
 431         }
 432
 433         mutex_lock(&local->iflist_mtx);
 434         rcu_assign_pointer(local->monitor_sdata, sdata);
 435         mutex_unlock(&local->iflist_mtx);
 436
 437         mutex_lock(&local->mtx);
 438         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 439                                         IEEE80211_CHANCTX_EXCLUSIVE);
 440         mutex_unlock(&local->mtx);
 441         if (ret) {
 442                 mutex_lock(&local->iflist_mtx);
 443                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
 444                 mutex_unlock(&local->iflist_mtx);
 445                 synchronize_net();
 446                 drv_remove_interface(local, sdata);
 447                 kfree(sdata);
 448                 return ret;
 449         }
 450
 451         return 0;
 452 }
 453
 454 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 455 {
 456         struct ieee80211_sub_if_data *sdata;
 457
 458         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 459                 return;
 460
 461         ASSERT_RTNL();
 462
 463         mutex_lock(&local->iflist_mtx);
 464
 465         sdata = rcu_dereference_protected(local->monitor_sdata,
 466                                           lockdep_is_held(&local->iflist_mtx));
 467         if (!sdata) {
 468                 mutex_unlock(&local->iflist_mtx);
 469                 return;
 470         }
 471
 472         RCU_INIT_POINTER(local->monitor_sdata, NULL);
 473         mutex_unlock(&local->iflist_mtx);
 474
 475         synchronize_net();
 476
 477         mutex_lock(&local->mtx);
 478         ieee80211_vif_release_channel(sdata);
 479         mutex_unlock(&local->mtx);
 480
 481         drv_remove_interface(local, sdata);
 482
 483         kfree(sdata);
 484 }
 485
 486 /*
 487  * NOTE: Be very careful when changing this function, it must NOT return
 488  * an error on interface type changes that have been pre-checked, so most
 489  * checks should be in ieee80211_check_concurrent_iface.
 490  */
 491 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 492 {
 493         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 494         struct net_device *dev = wdev->netdev;
 495         struct ieee80211_local *local = sdata->local;
 496         struct sta_info *sta;
 497         u32 changed = 0;
 498         int res;
 499         u32 hw_reconf_flags = 0;
 500
 501         switch (sdata->vif.type) {
 502         case NL80211_IFTYPE_WDS:
 503                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 504                         return -ENOLINK;
 505                 break;
 506         case NL80211_IFTYPE_AP_VLAN: {
 507                 struct ieee80211_sub_if_data *master;
 508
 509                 if (!sdata->bss)
 510                         return -ENOLINK;
 511
 512                 mutex_lock(&local->mtx);
 513                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 514                 mutex_unlock(&local->mtx);
 515
 516                 master = container_of(sdata->bss,
 517                                       struct ieee80211_sub_if_data, u.ap);
 518                 sdata->control_port_protocol =
 519                         master->control_port_protocol;
 520                 sdata->control_port_no_encrypt =
 521                         master->control_port_no_encrypt;
 522                 sdata->vif.cab_queue = master->vif.cab_queue;
 523                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
 524                        sizeof(sdata->vif.hw_queue));
 525                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
 526
 527                 mutex_lock(&local->key_mtx);
 528                 sdata->crypto_tx_tailroom_needed_cnt +=
 529                         master->crypto_tx_tailroom_needed_cnt;
 530                 mutex_unlock(&local->key_mtx);
 531
 532                 break;
 533                 }
 534         case NL80211_IFTYPE_AP:
 535                 sdata->bss = &sdata->u.ap;
 536                 break;
 537         case NL80211_IFTYPE_MESH_POINT:
 538         case NL80211_IFTYPE_STATION:
 539         case NL80211_IFTYPE_MONITOR:
 540         case NL80211_IFTYPE_ADHOC:
 541         case NL80211_IFTYPE_P2P_DEVICE:
 542         case NL80211_IFTYPE_OCB:
 543                 /* no special treatment */
 544                 break;
 545         case NL80211_IFTYPE_UNSPECIFIED:
 546         case NUM_NL80211_IFTYPES:
 547         case NL80211_IFTYPE_P2P_CLIENT:
 548         case NL80211_IFTYPE_P2P_GO:
 549                 /* cannot happen */
 550                 WARN_ON(1);
 551                 break;
 552         }
 553
 554         if (local->open_count == 0) {
 555                 res = drv_start(local);
 556                 if (res)
 557                         goto err_del_bss;
 558                 /* we're brought up, everything changes */
 559                 hw_reconf_flags = ~0;
 560                 ieee80211_led_radio(local, true);
 561                 ieee80211_mod_tpt_led_trig(local,
 562                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 563         }
 564
 565         /*
 566          * Copy the hopefully now-present MAC address to
 567          * this interface, if it has the special null one.
 568          */
 569         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 570                 memcpy(dev->dev_addr,
 571                        local->hw.wiphy->perm_addr,
 572                        ETH_ALEN);
 573                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 574
 575                 if (!is_valid_ether_addr(dev->dev_addr)) {
 576                         res = -EADDRNOTAVAIL;
 577                         goto err_stop;
 578                 }
 579         }
 580
 581         switch (sdata->vif.type) {
 582         case NL80211_IFTYPE_AP_VLAN:
 583                 /* no need to tell driver, but set carrier and chanctx */
 584                 if (rtnl_dereference(sdata->bss->beacon)) {
 585                         ieee80211_vif_vlan_copy_chanctx(sdata);
 586                         netif_carrier_on(dev);
 587                 } else {
 588                         netif_carrier_off(dev);
 589                 }
 590                 break;
 591         case NL80211_IFTYPE_MONITOR:
 592                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 593                         local->cooked_mntrs++;
 594                         break;
 595                 }
 596
 597                 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
 598                         res = drv_add_interface(local, sdata);
 599                         if (res)
 600                                 goto err_stop;
 601                 } else if (local->monitors == 0 && local->open_count == 0) {
 602                         res = ieee80211_add_virtual_monitor(local);
 603                         if (res)
 604                                 goto err_stop;
 605                 }
 606
 607                 /* must be before the call to ieee80211_configure_filter */
 608                 local->monitors++;
 609                 if (local->monitors == 1) {
 610                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 611                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 612                 }
 613
 614                 ieee80211_adjust_monitor_flags(sdata, 1);
 615                 ieee80211_configure_filter(local);
 616                 mutex_lock(&local->mtx);
 617                 ieee80211_recalc_idle(local);
 618                 mutex_unlock(&local->mtx);
 619
 620                 netif_carrier_on(dev);
 621                 break;
 622         default:
 623                 if (coming_up) {
 624                         ieee80211_del_virtual_monitor(local);
 625
 626                         res = drv_add_interface(local, sdata);
 627                         if (res)
 628                                 goto err_stop;
 629                         res = ieee80211_check_queues(sdata,
 630                                 ieee80211_vif_type_p2p(&sdata->vif));
 631                         if (res)
 632                                 goto err_del_interface;
 633                 }
 634
 635                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 636                         local->fif_pspoll++;
 637                         local->fif_probe_req++;
 638
 639                         ieee80211_configure_filter(local);
 640                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 641                         local->fif_probe_req++;
 642                 }
 643
 644                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 645                         changed |= ieee80211_reset_erp_info(sdata);
 646                 ieee80211_bss_info_change_notify(sdata, changed);
 647
 648                 switch (sdata->vif.type) {
 649                 case NL80211_IFTYPE_STATION:
 650                 case NL80211_IFTYPE_ADHOC:
 651                 case NL80211_IFTYPE_AP:
 652                 case NL80211_IFTYPE_MESH_POINT:
 653                 case NL80211_IFTYPE_OCB:
 654                         netif_carrier_off(dev);
 655                         break;
 656                 case NL80211_IFTYPE_WDS:
 657                 case NL80211_IFTYPE_P2P_DEVICE:
 658                         break;
 659                 default:
 660                         /* not reached */
 661                         WARN_ON(1);
 662                 }
 663
 664                 /*
 665                  * Set default queue parameters so drivers don't
 666                  * need to initialise the hardware if the hardware
 667                  * doesn't start up with sane defaults.
 668                  * Enable QoS for anything but station interfaces.
 669                  */
 670                 ieee80211_set_wmm_default(sdata, true,
 671                         sdata->vif.type != NL80211_IFTYPE_STATION);
 672         }
 673
 674         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 675
 676         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 677                 /* Create STA entry for the WDS peer */
 678                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 679                                      GFP_KERNEL);
 680                 if (!sta) {
 681                         res = -ENOMEM;
 682                         goto err_del_interface;
 683                 }
 684
 685                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 686                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 687                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 688
 689                 res = sta_info_insert(sta);
 690                 if (res) {
 691                         /* STA has been freed */
 692                         goto err_del_interface;
 693                 }
 694
 695                 rate_control_rate_init(sta);
 696                 netif_carrier_on(dev);
 697         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 698                 rcu_assign_pointer(local->p2p_sdata, sdata);
 699         }
 700
 701         /*
 702          * set_multicast_list will be invoked by the networking core
 703          * which will check whether any increments here were done in
 704          * error and sync them down to the hardware as filter flags.
 705          */
 706         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 707                 atomic_inc(&local->iff_allmultis);
 708
 709         if (coming_up)
 710                 local->open_count++;
 711
 712         if (hw_reconf_flags)
 713                 ieee80211_hw_config(local, hw_reconf_flags);
 714
 715         ieee80211_recalc_ps(local);
 716
 717         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 718             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 719                 /* XXX: for AP_VLAN, actually track AP queues */
 720                 netif_tx_start_all_queues(dev);
 721         } else if (dev) {
 722                 unsigned long flags;
 723                 int n_acs = IEEE80211_NUM_ACS;
 724                 int ac;
 725
 726                 if (local->hw.queues < IEEE80211_NUM_ACS)
 727                         n_acs = 1;
 728
 729                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 730                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 731                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 732                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 733                         for (ac = 0; ac < n_acs; ac++) {
 734                                 int ac_queue = sdata->vif.hw_queue[ac];
 735
 736                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 737                                     skb_queue_empty(&local->pending[ac_queue]))
 738                                         netif_start_subqueue(dev, ac);
 739                         }
 740                 }
 741                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 742         }
 743
 744         return 0;
 745  err_del_interface:
 746         drv_remove_interface(local, sdata);
 747  err_stop:
 748         if (!local->open_count)
 749                 drv_stop(local);
 750  err_del_bss:
 751         sdata->bss = NULL;
 752         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 753                 mutex_lock(&local->mtx);
 754                 list_del(&sdata->u.vlan.list);
 755                 mutex_unlock(&local->mtx);
 756         }
 757         /* might already be clear but that doesn't matter */
 758         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 759         return res;
 760 }
 761
 762 static int ieee80211_open(struct net_device *dev)
 763 {
 764         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 765         int err;
 766
 767         /* fail early if user set an invalid address */
 768         if (!is_valid_ether_addr(dev->dev_addr))
 769                 return -EADDRNOTAVAIL;
 770
 771         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 772         if (err)
 773                 return err;
 774
 775         return ieee80211_do_open(&sdata->wdev, true);
 776 }
 777
 778 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 779                               bool going_down)
 780 {
 781         struct ieee80211_local *local = sdata->local;
 782         unsigned long flags;
 783         struct sk_buff *skb, *tmp;
 784         u32 hw_reconf_flags = 0;
 785         int i, flushed;
 786         struct ps_data *ps;
 787         struct cfg80211_chan_def chandef;
 788         bool cancel_scan;
 789
 790         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 791
 792         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 793         if (cancel_scan)
 794                 ieee80211_scan_cancel(local);
 795
 796         /*
 797          * Stop TX on this interface first.
 798          */
 799         if (sdata->dev)
 800                 netif_tx_stop_all_queues(sdata->dev);
 801
 802         ieee80211_roc_purge(local, sdata);
 803
 804         switch (sdata->vif.type) {
 805         case NL80211_IFTYPE_STATION:
 806                 ieee80211_mgd_stop(sdata);
 807                 break;
 808         case NL80211_IFTYPE_ADHOC:
 809                 ieee80211_ibss_stop(sdata);
 810                 break;
 811         case NL80211_IFTYPE_AP:
 812                 cancel_work_sync(&sdata->u.ap.request_smps_work);
 813                 break;
 814         default:
 815                 break;
 816         }
 817
 818         /*
 819          * Remove all stations associated with this interface.
 820          *
 821          * This must be done before calling ops->remove_interface()
 822          * because otherwise we can later invoke ops->sta_notify()
 823          * whenever the STAs are removed, and that invalidates driver
 824          * assumptions about always getting a vif pointer that is valid
 825          * (because if we remove a STA after ops->remove_interface()
 826          * the driver will have removed the vif info already!)
 827          *
 828          * In WDS mode a station must exist here and be flushed, for
 829          * AP_VLANs stations may exist since there's nothing else that
 830          * would have removed them, but in other modes there shouldn't
 831          * be any stations.
 832          */
 833         flushed = sta_info_flush(sdata);
 834         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
 835                      ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 836                       (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
 837
 838         /* don't count this interface for allmulti while it is down */
 839         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 840                 atomic_dec(&local->iff_allmultis);
 841
 842         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 843                 local->fif_pspoll--;
 844                 local->fif_probe_req--;
 845         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 846                 local->fif_probe_req--;
 847         }
 848
 849         if (sdata->dev) {
 850                 netif_addr_lock_bh(sdata->dev);
 851                 spin_lock_bh(&local->filter_lock);
 852                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 853                                  sdata->dev->addr_len);
 854                 spin_unlock_bh(&local->filter_lock);
 855                 netif_addr_unlock_bh(sdata->dev);
 856         }
 857
 858         del_timer_sync(&local->dynamic_ps_timer);
 859         cancel_work_sync(&local->dynamic_ps_enable_work);
 860
 861         cancel_work_sync(&sdata->recalc_smps);
 862         sdata_lock(sdata);
 863         mutex_lock(&local->mtx);
 864         sdata->vif.csa_active = false;
 865         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 866                 sdata->u.mgd.csa_waiting_bcn = false;
 867         if (sdata->csa_block_tx) {
 868                 ieee80211_wake_vif_queues(local, sdata,
 869                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 870                 sdata->csa_block_tx = false;
 871         }
 872         mutex_unlock(&local->mtx);
 873         sdata_unlock(sdata);
 874
 875         cancel_work_sync(&sdata->csa_finalize_work);
 876
 877         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 878
 879         if (sdata->wdev.cac_started) {
 880                 chandef = sdata->vif.bss_conf.chandef;
 881                 WARN_ON(local->suspended);
 882                 mutex_lock(&local->mtx);
 883                 ieee80211_vif_release_channel(sdata);
 884                 mutex_unlock(&local->mtx);
 885                 cfg80211_cac_event(sdata->dev, &chandef,
 886                                    NL80211_RADAR_CAC_ABORTED,
 887                                    GFP_KERNEL);
 888         }
 889
 890         /* APs need special treatment */
 891         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 892                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 893
 894                 /* down all dependent devices, that is VLANs */
 895                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 896                                          u.vlan.list)
 897                         dev_close(vlan->dev);
 898                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 899         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 900                 /* remove all packets in parent bc_buf pointing to this dev */
 901                 ps = &sdata->bss->ps;
 902
 903                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 904                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 905                         if (skb->dev == sdata->dev) {
 906                                 __skb_unlink(skb, &ps->bc_buf);
 907                                 local->total_ps_buffered--;
 908                                 ieee80211_free_txskb(&local->hw, skb);
 909                         }
 910                 }
 911                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 912         }
 913
 914         if (going_down)
 915                 local->open_count--;
 916
 917         switch (sdata->vif.type) {
 918         case NL80211_IFTYPE_AP_VLAN:
 919                 mutex_lock(&local->mtx);
 920                 list_del(&sdata->u.vlan.list);
 921                 mutex_unlock(&local->mtx);
 922                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 923                 /* see comment in the default case below */
 924                 ieee80211_free_keys(sdata, true);
 925                 /* no need to tell driver */
 926                 break;
 927         case NL80211_IFTYPE_MONITOR:
 928                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 929                         local->cooked_mntrs--;
 930                         break;
 931                 }
 932
 933                 local->monitors--;
 934                 if (local->monitors == 0) {
 935                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 936                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 937                 }
 938
 939                 ieee80211_adjust_monitor_flags(sdata, -1);
 940                 break;
 941         case NL80211_IFTYPE_P2P_DEVICE:
 942                 /* relies on synchronize_rcu() below */
 943                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 944                 /* fall through */
 945         default:
 946                 cancel_work_sync(&sdata->work);
 947                 /*
 948                  * When we get here, the interface is marked down.
 949                  * Free the remaining keys, if there are any
 950                  * (which can happen in AP mode if userspace sets
 951                  * keys before the interface is operating, and maybe
 952                  * also in WDS mode)
 953                  *
 954                  * Force the key freeing to always synchronize_net()
 955                  * to wait for the RX path in case it is using this
 956                  * interface enqueuing frames at this very time on
 957                  * another CPU.
 958                  */
 959                 ieee80211_free_keys(sdata, true);
 960                 skb_queue_purge(&sdata->skb_queue);
 961         }
 962
 963         sdata->bss = NULL;
 964
 965         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 966         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 967                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 968                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 969                         if (info->control.vif == &sdata->vif) {
 970                                 __skb_unlink(skb, &local->pending[i]);
 971                                 ieee80211_free_txskb(&local->hw, skb);
 972                         }
 973                 }
 974         }
 975         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 976
 977         if (sdata->vif.txq) {
 978                 struct txq_info *txqi = to_txq_info(sdata->vif.txq);
 979
 980                 ieee80211_purge_tx_queue(&local->hw, &txqi->queue);
 981                 atomic_set(&sdata->txqs_len[txqi->txq.ac], 0);
 982         }
 983
 984         if (local->open_count == 0)
 985                 ieee80211_clear_tx_pending(local);
 986
 987         /*
 988          * If the interface goes down while suspended, presumably because
 989          * the device was unplugged and that happens before our resume,
 990          * then the driver is already unconfigured and the remainder of
 991          * this function isn't needed.
 992          * XXX: what about WoWLAN? If the device has software state, e.g.
 993          *      memory allocated, it might expect teardown commands from
 994          *      mac80211 here?
 995          */
 996         if (local->suspended) {
 997                 WARN_ON(local->wowlan);
 998                 WARN_ON(rtnl_dereference(local->monitor_sdata));
 999                 return;
1000         }
1001
1002         switch (sdata->vif.type) {
1003         case NL80211_IFTYPE_AP_VLAN:
1004                 break;
1005         case NL80211_IFTYPE_MONITOR:
1006                 if (local->monitors == 0)
1007                         ieee80211_del_virtual_monitor(local);
1008
1009                 mutex_lock(&local->mtx);
1010                 ieee80211_recalc_idle(local);
1011                 mutex_unlock(&local->mtx);
1012
1013                 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
1014                         break;
1015
1016                 /* fall through */
1017         default:
1018                 if (going_down)
1019                         drv_remove_interface(local, sdata);
1020         }
1021
1022         ieee80211_recalc_ps(local);
1023
1024         if (cancel_scan)
1025                 flush_delayed_work(&local->scan_work);
1026
1027         if (local->open_count == 0) {
1028                 ieee80211_stop_device(local);
1029
1030                 /* no reconfiguring after stop! */
1031                 return;
1032         }
1033
1034         /* do after stop to avoid reconfiguring when we stop anyway */
1035         ieee80211_configure_filter(local);
1036         ieee80211_hw_config(local, hw_reconf_flags);
1037
1038         if (local->monitors == local->open_count)
1039                 ieee80211_add_virtual_monitor(local);
1040 }
1041
1042 static int ieee80211_stop(struct net_device *dev)
1043 {
1044         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1045
1046         ieee80211_do_stop(sdata, true);
1047
1048         return 0;
1049 }
1050
1051 static void ieee80211_set_multicast_list(struct net_device *dev)
1052 {
1053         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1054         struct ieee80211_local *local = sdata->local;
1055         int allmulti, sdata_allmulti;
1056
1057         allmulti = !!(dev->flags & IFF_ALLMULTI);
1058         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1059
1060         if (allmulti != sdata_allmulti) {
1061                 if (dev->flags & IFF_ALLMULTI)
1062                         atomic_inc(&local->iff_allmultis);
1063                 else
1064                         atomic_dec(&local->iff_allmultis);
1065                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1066         }
1067
1068         spin_lock_bh(&local->filter_lock);
1069         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1070         spin_unlock_bh(&local->filter_lock);
1071         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1072 }
1073
1074 /*
1075  * Called when the netdev is removed or, by the code below, before
1076  * the interface type changes.
1077  */
1078 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1079 {
1080         int i;
1081
1082         /* free extra data */
1083         ieee80211_free_keys(sdata, false);
1084
1085         ieee80211_debugfs_remove_netdev(sdata);
1086
1087         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1088                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1089         sdata->fragment_next = 0;
1090
1091         if (ieee80211_vif_is_mesh(&sdata->vif))
1092                 mesh_rmc_free(sdata);
1093 }
1094
1095 static void ieee80211_uninit(struct net_device *dev)
1096 {
1097         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1098 }
1099
1100 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1101                                          struct sk_buff *skb,
1102                                          void *accel_priv,
1103                                          select_queue_fallback_t fallback)
1104 {
1105         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1106 }
1107
1108 static struct rtnl_link_stats64 *
1109 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1110 {
1111         int i;
1112
1113         for_each_possible_cpu(i) {
1114                 const struct pcpu_sw_netstats *tstats;
1115                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1116                 unsigned int start;
1117
1118                 tstats = per_cpu_ptr(dev->tstats, i);
1119
1120                 do {
1121                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
1122                         rx_packets = tstats->rx_packets;
1123                         tx_packets = tstats->tx_packets;
1124                         rx_bytes = tstats->rx_bytes;
1125                         tx_bytes = tstats->tx_bytes;
1126                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1127
1128                 stats->rx_packets += rx_packets;
1129                 stats->tx_packets += tx_packets;
1130                 stats->rx_bytes   += rx_bytes;
1131                 stats->tx_bytes   += tx_bytes;
1132         }
1133
1134         return stats;
1135 }
1136
1137 static const struct net_device_ops ieee80211_dataif_ops = {
1138         .ndo_open               = ieee80211_open,
1139         .ndo_stop               = ieee80211_stop,
1140         .ndo_uninit             = ieee80211_uninit,
1141         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1142         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1143         .ndo_change_mtu         = ieee80211_change_mtu,
1144         .ndo_set_mac_address    = ieee80211_change_mac,
1145         .ndo_select_queue       = ieee80211_netdev_select_queue,
1146         .ndo_get_stats64        = ieee80211_get_stats64,
1147 };
1148
1149 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1150                                           struct sk_buff *skb,
1151                                           void *accel_priv,
1152                                           select_queue_fallback_t fallback)
1153 {
1154         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1155         struct ieee80211_local *local = sdata->local;
1156         struct ieee80211_hdr *hdr;
1157         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1158
1159         if (local->hw.queues < IEEE80211_NUM_ACS)
1160                 return 0;
1161
1162         if (skb->len < 4 ||
1163             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1164                 return 0; /* doesn't matter, frame will be dropped */
1165
1166         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1167
1168         return ieee80211_select_queue_80211(sdata, skb, hdr);
1169 }
1170
1171 static const struct net_device_ops ieee80211_monitorif_ops = {
1172         .ndo_open               = ieee80211_open,
1173         .ndo_stop               = ieee80211_stop,
1174         .ndo_uninit             = ieee80211_uninit,
1175         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1176         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1177         .ndo_change_mtu         = ieee80211_change_mtu,
1178         .ndo_set_mac_address    = ieee80211_change_mac,
1179         .ndo_select_queue       = ieee80211_monitor_select_queue,
1180         .ndo_get_stats64        = ieee80211_get_stats64,
1181 };
1182
1183 static void ieee80211_if_free(struct net_device *dev)
1184 {
1185         free_percpu(dev->tstats);
1186         free_netdev(dev);
1187 }
1188
1189 static void ieee80211_if_setup(struct net_device *dev)
1190 {
1191         ether_setup(dev);
1192         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1193         dev->netdev_ops = &ieee80211_dataif_ops;
1194         dev->destructor = ieee80211_if_free;
1195 }
1196
1197 static void ieee80211_iface_work(struct work_struct *work)
1198 {
1199         struct ieee80211_sub_if_data *sdata =
1200                 container_of(work, struct ieee80211_sub_if_data, work);
1201         struct ieee80211_local *local = sdata->local;
1202         struct sk_buff *skb;
1203         struct sta_info *sta;
1204         struct ieee80211_ra_tid *ra_tid;
1205         struct ieee80211_rx_agg *rx_agg;
1206
1207         if (!ieee80211_sdata_running(sdata))
1208                 return;
1209
1210         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1211                 return;
1212
1213         if (!ieee80211_can_run_worker(local))
1214                 return;
1215
1216         /* first process frames */
1217         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1218                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1219
1220                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1221                         ra_tid = (void *)&skb->cb;
1222                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1223                                                  ra_tid->tid);
1224                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1225                         ra_tid = (void *)&skb->cb;
1226                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1227                                                 ra_tid->tid);
1228                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1229                         rx_agg = (void *)&skb->cb;
1230                         mutex_lock(&local->sta_mtx);
1231                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1232                         if (sta)
1233                                 __ieee80211_start_rx_ba_session(sta,
1234                                                 0, 0, 0, 1, rx_agg->tid,
1235                                                 IEEE80211_MAX_AMPDU_BUF,
1236                                                 false, true);
1237                         mutex_unlock(&local->sta_mtx);
1238                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1239                         rx_agg = (void *)&skb->cb;
1240                         mutex_lock(&local->sta_mtx);
1241                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1242                         if (sta)
1243                                 __ieee80211_stop_rx_ba_session(sta,
1244                                                         rx_agg->tid,
1245                                                         WLAN_BACK_RECIPIENT, 0,
1246                                                         false);
1247                         mutex_unlock(&local->sta_mtx);
1248                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1249                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1250                         int len = skb->len;
1251
1252                         mutex_lock(&local->sta_mtx);
1253                         sta = sta_info_get_bss(sdata, mgmt->sa);
1254                         if (sta) {
1255                                 switch (mgmt->u.action.u.addba_req.action_code) {
1256                                 case WLAN_ACTION_ADDBA_REQ:
1257                                         ieee80211_process_addba_request(
1258                                                         local, sta, mgmt, len);
1259                                         break;
1260                                 case WLAN_ACTION_ADDBA_RESP:
1261                                         ieee80211_process_addba_resp(local, sta,
1262                                                                      mgmt, len);
1263                                         break;
1264                                 case WLAN_ACTION_DELBA:
1265                                         ieee80211_process_delba(sdata, sta,
1266                                                                 mgmt, len);
1267                                         break;
1268                                 default:
1269                                         WARN_ON(1);
1270                                         break;
1271                                 }
1272                         }
1273                         mutex_unlock(&local->sta_mtx);
1274                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1275                         struct ieee80211_hdr *hdr = (void *)mgmt;
1276                         /*
1277                          * So the frame isn't mgmt, but frame_control
1278                          * is at the right place anyway, of course, so
1279                          * the if statement is correct.
1280                          *
1281                          * Warn if we have other data frame types here,
1282                          * they must not get here.
1283                          */
1284                         WARN_ON(hdr->frame_control &
1285                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1286                         WARN_ON(!(hdr->seq_ctrl &
1287                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1288                         /*
1289                          * This was a fragment of a frame, received while
1290                          * a block-ack session was active. That cannot be
1291                          * right, so terminate the session.
1292                          */
1293                         mutex_lock(&local->sta_mtx);
1294                         sta = sta_info_get_bss(sdata, mgmt->sa);
1295                         if (sta) {
1296                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1297                                                 IEEE80211_QOS_CTL_TID_MASK;
1298
1299                                 __ieee80211_stop_rx_ba_session(
1300                                         sta, tid, WLAN_BACK_RECIPIENT,
1301                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1302                                         true);
1303                         }
1304                         mutex_unlock(&local->sta_mtx);
1305                 } else switch (sdata->vif.type) {
1306                 case NL80211_IFTYPE_STATION:
1307                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1308                         break;
1309                 case NL80211_IFTYPE_ADHOC:
1310                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1311                         break;
1312                 case NL80211_IFTYPE_MESH_POINT:
1313                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1314                                 break;
1315                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1316                         break;
1317                 default:
1318                         WARN(1, "frame for unexpected interface type");
1319                         break;
1320                 }
1321
1322                 kfree_skb(skb);
1323         }
1324
1325         /* then other type-dependent work */
1326         switch (sdata->vif.type) {
1327         case NL80211_IFTYPE_STATION:
1328                 ieee80211_sta_work(sdata);
1329                 break;
1330         case NL80211_IFTYPE_ADHOC:
1331                 ieee80211_ibss_work(sdata);
1332                 break;
1333         case NL80211_IFTYPE_MESH_POINT:
1334                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1335                         break;
1336                 ieee80211_mesh_work(sdata);
1337                 break;
1338         case NL80211_IFTYPE_OCB:
1339                 ieee80211_ocb_work(sdata);
1340                 break;
1341         default:
1342                 break;
1343         }
1344 }
1345
1346 static void ieee80211_recalc_smps_work(struct work_struct *work)
1347 {
1348         struct ieee80211_sub_if_data *sdata =
1349                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1350
1351         ieee80211_recalc_smps(sdata);
1352 }
1353
1354 /*
1355  * Helper function to initialise an interface to a specific type.
1356  */
1357 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1358                                   enum nl80211_iftype type)
1359 {
1360         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1361                                                     0xff, 0xff, 0xff};
1362
1363         /* clear type-dependent union */
1364         memset(&sdata->u, 0, sizeof(sdata->u));
1365
1366         /* and set some type-dependent values */
1367         sdata->vif.type = type;
1368         sdata->vif.p2p = false;
1369         sdata->wdev.iftype = type;
1370
1371         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1372         sdata->control_port_no_encrypt = false;
1373         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1374         sdata->vif.bss_conf.idle = true;
1375
1376         sdata->noack_map = 0;
1377
1378         /* only monitor/p2p-device differ */
1379         if (sdata->dev) {
1380                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1381                 sdata->dev->type = ARPHRD_ETHER;
1382         }
1383
1384         skb_queue_head_init(&sdata->skb_queue);
1385         INIT_WORK(&sdata->work, ieee80211_iface_work);
1386         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1387         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1388         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1389         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1390
1391         switch (type) {
1392         case NL80211_IFTYPE_P2P_GO:
1393                 type = NL80211_IFTYPE_AP;
1394                 sdata->vif.type = type;
1395                 sdata->vif.p2p = true;
1396                 /* fall through */
1397         case NL80211_IFTYPE_AP:
1398                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1399                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1400                 INIT_WORK(&sdata->u.ap.request_smps_work,
1401                           ieee80211_request_smps_ap_work);
1402                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1403                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1404                 break;
1405         case NL80211_IFTYPE_P2P_CLIENT:
1406                 type = NL80211_IFTYPE_STATION;
1407                 sdata->vif.type = type;
1408                 sdata->vif.p2p = true;
1409                 /* fall through */
1410         case NL80211_IFTYPE_STATION:
1411                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1412                 ieee80211_sta_setup_sdata(sdata);
1413                 break;
1414         case NL80211_IFTYPE_OCB:
1415                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1416                 ieee80211_ocb_setup_sdata(sdata);
1417                 break;
1418         case NL80211_IFTYPE_ADHOC:
1419                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1420                 ieee80211_ibss_setup_sdata(sdata);
1421                 break;
1422         case NL80211_IFTYPE_MESH_POINT:
1423                 if (ieee80211_vif_is_mesh(&sdata->vif))
1424                         ieee80211_mesh_init_sdata(sdata);
1425                 break;
1426         case NL80211_IFTYPE_MONITOR:
1427                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1428                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1429                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1430                                       MONITOR_FLAG_OTHER_BSS;
1431                 break;
1432         case NL80211_IFTYPE_WDS:
1433                 sdata->vif.bss_conf.bssid = NULL;
1434                 break;
1435         case NL80211_IFTYPE_AP_VLAN:
1436         case NL80211_IFTYPE_P2P_DEVICE:
1437                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1438                 break;
1439         case NL80211_IFTYPE_UNSPECIFIED:
1440         case NUM_NL80211_IFTYPES:
1441                 BUG();
1442                 break;
1443         }
1444
1445         ieee80211_debugfs_add_netdev(sdata);
1446 }
1447
1448 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1449                                            enum nl80211_iftype type)
1450 {
1451         struct ieee80211_local *local = sdata->local;
1452         int ret, err;
1453         enum nl80211_iftype internal_type = type;
1454         bool p2p = false;
1455
1456         ASSERT_RTNL();
1457
1458         if (!local->ops->change_interface)
1459                 return -EBUSY;
1460
1461         switch (sdata->vif.type) {
1462         case NL80211_IFTYPE_AP:
1463         case NL80211_IFTYPE_STATION:
1464         case NL80211_IFTYPE_ADHOC:
1465         case NL80211_IFTYPE_OCB:
1466                 /*
1467                  * Could maybe also all others here?
1468                  * Just not sure how that interacts
1469                  * with the RX/config path e.g. for
1470                  * mesh.
1471                  */
1472                 break;
1473         default:
1474                 return -EBUSY;
1475         }
1476
1477         switch (type) {
1478         case NL80211_IFTYPE_AP:
1479         case NL80211_IFTYPE_STATION:
1480         case NL80211_IFTYPE_ADHOC:
1481         case NL80211_IFTYPE_OCB:
1482                 /*
1483                  * Could probably support everything
1484                  * but WDS here (WDS do_open can fail
1485                  * under memory pressure, which this
1486                  * code isn't prepared to handle).
1487                  */
1488                 break;
1489         case NL80211_IFTYPE_P2P_CLIENT:
1490                 p2p = true;
1491                 internal_type = NL80211_IFTYPE_STATION;
1492                 break;
1493         case NL80211_IFTYPE_P2P_GO:
1494                 p2p = true;
1495                 internal_type = NL80211_IFTYPE_AP;
1496                 break;
1497         default:
1498                 return -EBUSY;
1499         }
1500
1501         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1502         if (ret)
1503                 return ret;
1504
1505         ieee80211_do_stop(sdata, false);
1506
1507         ieee80211_teardown_sdata(sdata);
1508
1509         ret = drv_change_interface(local, sdata, internal_type, p2p);
1510         if (ret)
1511                 type = ieee80211_vif_type_p2p(&sdata->vif);
1512
1513         /*
1514          * Ignore return value here, there's not much we can do since
1515          * the driver changed the interface type internally already.
1516          * The warnings will hopefully make driver authors fix it :-)
1517          */
1518         ieee80211_check_queues(sdata, type);
1519
1520         ieee80211_setup_sdata(sdata, type);
1521
1522         err = ieee80211_do_open(&sdata->wdev, false);
1523         WARN(err, "type change: do_open returned %d", err);
1524
1525         return ret;
1526 }
1527
1528 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1529                              enum nl80211_iftype type)
1530 {
1531         int ret;
1532
1533         ASSERT_RTNL();
1534
1535         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1536                 return 0;
1537
1538         if (ieee80211_sdata_running(sdata)) {
1539                 ret = ieee80211_runtime_change_iftype(sdata, type);
1540                 if (ret)
1541                         return ret;
1542         } else {
1543                 /* Purge and reset type-dependent state. */
1544                 ieee80211_teardown_sdata(sdata);
1545                 ieee80211_setup_sdata(sdata, type);
1546         }
1547
1548         /* reset some values that shouldn't be kept across type changes */
1549         if (type == NL80211_IFTYPE_STATION)
1550                 sdata->u.mgd.use_4addr = false;
1551
1552         return 0;
1553 }
1554
1555 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1556                                        u8 *perm_addr, enum nl80211_iftype type)
1557 {
1558         struct ieee80211_sub_if_data *sdata;
1559         u64 mask, start, addr, val, inc;
1560         u8 *m;
1561         u8 tmp_addr[ETH_ALEN];
1562         int i;
1563
1564         /* default ... something at least */
1565         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1566
1567         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1568             local->hw.wiphy->n_addresses <= 1)
1569                 return;
1570
1571         mutex_lock(&local->iflist_mtx);
1572
1573         switch (type) {
1574         case NL80211_IFTYPE_MONITOR:
1575                 /* doesn't matter */
1576                 break;
1577         case NL80211_IFTYPE_WDS:
1578         case NL80211_IFTYPE_AP_VLAN:
1579                 /* match up with an AP interface */
1580                 list_for_each_entry(sdata, &local->interfaces, list) {
1581                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1582                                 continue;
1583                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1584                         break;
1585                 }
1586                 /* keep default if no AP interface present */
1587                 break;
1588         case NL80211_IFTYPE_P2P_CLIENT:
1589         case NL80211_IFTYPE_P2P_GO:
1590                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1591                         list_for_each_entry(sdata, &local->interfaces, list) {
1592                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1593                                         continue;
1594                                 if (!ieee80211_sdata_running(sdata))
1595                                         continue;
1596                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1597                                 goto out_unlock;
1598                         }
1599                 }
1600                 /* otherwise fall through */
1601         default:
1602                 /* assign a new address if possible -- try n_addresses first */
1603                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1604                         bool used = false;
1605
1606                         list_for_each_entry(sdata, &local->interfaces, list) {
1607                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1608                                                      sdata->vif.addr)) {
1609                                         used = true;
1610                                         break;
1611                                 }
1612                         }
1613
1614                         if (!used) {
1615                                 memcpy(perm_addr,
1616                                        local->hw.wiphy->addresses[i].addr,
1617                                        ETH_ALEN);
1618                                 break;
1619                         }
1620                 }
1621
1622                 /* try mask if available */
1623                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1624                         break;
1625
1626                 m = local->hw.wiphy->addr_mask;
1627                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1628                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1629                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1630
1631                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1632                         /* not a contiguous mask ... not handled now! */
1633                         pr_info("not contiguous\n");
1634                         break;
1635                 }
1636
1637                 /*
1638                  * Pick address of existing interface in case user changed
1639                  * MAC address manually, default to perm_addr.
1640                  */
1641                 m = local->hw.wiphy->perm_addr;
1642                 list_for_each_entry(sdata, &local->interfaces, list) {
1643                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1644                                 continue;
1645                         m = sdata->vif.addr;
1646                         break;
1647                 }
1648                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1649                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1650                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1651
1652                 inc = 1ULL<<__ffs64(mask);
1653                 val = (start & mask);
1654                 addr = (start & ~mask) | (val & mask);
1655                 do {
1656                         bool used = false;
1657
1658                         tmp_addr[5] = addr >> 0*8;
1659                         tmp_addr[4] = addr >> 1*8;
1660                         tmp_addr[3] = addr >> 2*8;
1661                         tmp_addr[2] = addr >> 3*8;
1662                         tmp_addr[1] = addr >> 4*8;
1663                         tmp_addr[0] = addr >> 5*8;
1664
1665                         val += inc;
1666
1667                         list_for_each_entry(sdata, &local->interfaces, list) {
1668                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1669                                         used = true;
1670                                         break;
1671                                 }
1672                         }
1673
1674                         if (!used) {
1675                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1676                                 break;
1677                         }
1678                         addr = (start & ~mask) | (val & mask);
1679                 } while (addr != start);
1680
1681                 break;
1682         }
1683
1684  out_unlock:
1685         mutex_unlock(&local->iflist_mtx);
1686 }
1687
1688 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1689                      unsigned char name_assign_type,
1690                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1691                      struct vif_params *params)
1692 {
1693         struct net_device *ndev = NULL;
1694         struct ieee80211_sub_if_data *sdata = NULL;
1695         struct txq_info *txqi;
1696         int ret, i;
1697         int txqs = 1;
1698
1699         ASSERT_RTNL();
1700
1701         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1702                 struct wireless_dev *wdev;
1703
1704                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1705                                 GFP_KERNEL);
1706                 if (!sdata)
1707                         return -ENOMEM;
1708                 wdev = &sdata->wdev;
1709
1710                 sdata->dev = NULL;
1711                 strlcpy(sdata->name, name, IFNAMSIZ);
1712                 ieee80211_assign_perm_addr(local, wdev->address, type);
1713                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1714         } else {
1715                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1716                                  sizeof(void *));
1717                 int txq_size = 0;
1718
1719                 if (local->ops->wake_tx_queue)
1720                         txq_size += sizeof(struct txq_info) +
1721                                     local->hw.txq_data_size;
1722
1723                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1724                         txqs = IEEE80211_NUM_ACS;
1725
1726                 ndev = alloc_netdev_mqs(size + txq_size,
1727                                         name, name_assign_type,
1728                                         ieee80211_if_setup, txqs, 1);
1729                 if (!ndev)
1730                         return -ENOMEM;
1731                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1732
1733                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1734                 if (!ndev->tstats) {
1735                         free_netdev(ndev);
1736                         return -ENOMEM;
1737                 }
1738
1739                 ndev->needed_headroom = local->tx_headroom +
1740                                         4*6 /* four MAC addresses */
1741                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1742                                         + 6 /* mesh */
1743                                         + 8 /* rfc1042/bridge tunnel */
1744                                         - ETH_HLEN /* ethernet hard_header_len */
1745                                         + IEEE80211_ENCRYPT_HEADROOM;
1746                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1747
1748                 ret = dev_alloc_name(ndev, ndev->name);
1749                 if (ret < 0) {
1750                         free_netdev(ndev);
1751                         return ret;
1752                 }
1753
1754                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1755                 if (params && is_valid_ether_addr(params->macaddr))
1756                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1757                 else
1758                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1759                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1760
1761                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1762                 sdata = netdev_priv(ndev);
1763                 ndev->ieee80211_ptr = &sdata->wdev;
1764                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1765                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1766
1767                 if (txq_size) {
1768                         txqi = netdev_priv(ndev) + size;
1769                         ieee80211_init_tx_queue(sdata, NULL, txqi, 0);
1770                 }
1771
1772                 sdata->dev = ndev;
1773         }
1774
1775         /* initialise type-independent data */
1776         sdata->wdev.wiphy = local->hw.wiphy;
1777         sdata->local = local;
1778
1779         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1780                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1781
1782         INIT_LIST_HEAD(&sdata->key_list);
1783
1784         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1785                           ieee80211_dfs_cac_timer_work);
1786         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1787                           ieee80211_delayed_tailroom_dec);
1788
1789         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1790                 struct ieee80211_supported_band *sband;
1791                 sband = local->hw.wiphy->bands[i];
1792                 sdata->rc_rateidx_mask[i] =
1793                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1794                 if (sband) {
1795                         __le16 cap;
1796                         u16 *vht_rate_mask;
1797
1798                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1799                                sband->ht_cap.mcs.rx_mask,
1800                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1801
1802                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1803                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1804                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1805                 } else {
1806                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1807                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1808                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1809                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1810                 }
1811         }
1812
1813         ieee80211_set_default_queues(sdata);
1814
1815         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1816         sdata->user_power_level = local->user_power_level;
1817
1818         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1819
1820         /* setup type-dependent data */
1821         ieee80211_setup_sdata(sdata, type);
1822
1823         if (ndev) {
1824                 if (params) {
1825                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1826                         if (type == NL80211_IFTYPE_STATION)
1827                                 sdata->u.mgd.use_4addr = params->use_4addr;
1828                 }
1829
1830                 ndev->features |= local->hw.netdev_features;
1831
1832                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1833
1834                 ret = register_netdevice(ndev);
1835                 if (ret) {
1836                         free_netdev(ndev);
1837                         return ret;
1838                 }
1839         }
1840
1841         mutex_lock(&local->iflist_mtx);
1842         list_add_tail_rcu(&sdata->list, &local->interfaces);
1843         mutex_unlock(&local->iflist_mtx);
1844
1845         if (new_wdev)
1846                 *new_wdev = &sdata->wdev;
1847
1848         return 0;
1849 }
1850
1851 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1852 {
1853         ASSERT_RTNL();
1854
1855         mutex_lock(&sdata->local->iflist_mtx);
1856         list_del_rcu(&sdata->list);
1857         mutex_unlock(&sdata->local->iflist_mtx);
1858
1859         synchronize_rcu();
1860
1861         if (sdata->dev) {
1862                 unregister_netdevice(sdata->dev);
1863         } else {
1864                 cfg80211_unregister_wdev(&sdata->wdev);
1865                 ieee80211_teardown_sdata(sdata);
1866                 kfree(sdata);
1867         }
1868 }
1869
1870 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1871 {
1872         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1873                 return;
1874         ieee80211_do_stop(sdata, true);
1875 }
1876
1877 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1878 {
1879         struct ieee80211_sub_if_data *sdata, *tmp;
1880         LIST_HEAD(unreg_list);
1881         LIST_HEAD(wdev_list);
1882
1883         ASSERT_RTNL();
1884
1885         /* Before destroying the interfaces, make sure they're all stopped so
1886          * that the hardware is stopped. Otherwise, the driver might still be
1887          * iterating the interfaces during the shutdown, e.g. from a worker
1888          * or from RX processing or similar, and if it does so (using atomic
1889          * iteration) while we're manipulating the list, the iteration will
1890          * crash.
1891          *
1892          * After this, the hardware should be stopped and the driver should
1893          * have stopped all of its activities, so that we can do RCU-unaware
1894          * manipulations of the interface list below.
1895          */
1896         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1897
1898         WARN(local->open_count, "%s: open count remains %d\n",
1899              wiphy_name(local->hw.wiphy), local->open_count);
1900
1901         mutex_lock(&local->iflist_mtx);
1902         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1903                 list_del(&sdata->list);
1904
1905                 if (sdata->dev)
1906                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1907                 else
1908                         list_add(&sdata->list, &wdev_list);
1909         }
1910         mutex_unlock(&local->iflist_mtx);
1911         unregister_netdevice_many(&unreg_list);
1912
1913         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1914                 list_del(&sdata->list);
1915                 cfg80211_unregister_wdev(&sdata->wdev);
1916                 kfree(sdata);
1917         }
1918 }
1919
1920 static int netdev_notify(struct notifier_block *nb,
1921                          unsigned long state, void *ptr)
1922 {
1923         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1924         struct ieee80211_sub_if_data *sdata;
1925
1926         if (state != NETDEV_CHANGENAME)
1927                 return NOTIFY_DONE;
1928
1929         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1930                 return NOTIFY_DONE;
1931
1932         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1933                 return NOTIFY_DONE;
1934
1935         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1936         memcpy(sdata->name, dev->name, IFNAMSIZ);
1937         ieee80211_debugfs_rename_netdev(sdata);
1938
1939         return NOTIFY_OK;
1940 }
1941
1942 static struct notifier_block mac80211_netdev_notifier = {
1943         .notifier_call = netdev_notify,
1944 };
1945
1946 int ieee80211_iface_init(void)
1947 {
1948         return register_netdevice_notifier(&mac80211_netdev_notifier);
1949 }
1950
1951 void ieee80211_iface_exit(void)
1952 {
1953         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1954 }