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 static void ieee80211_iface_work(struct work_struct *work);
  47
  48 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  49 {
  50         struct ieee80211_chanctx_conf *chanctx_conf;
  51         int power;
  52
  53         rcu_read_lock();
  54         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  55         if (!chanctx_conf) {
  56                 rcu_read_unlock();
  57                 return false;
  58         }
  59
  60         power = ieee80211_chandef_max_power(&chanctx_conf->def);
  61         rcu_read_unlock();
  62
  63         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  64                 power = min(power, sdata->user_power_level);
  65
  66         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  67                 power = min(power, sdata->ap_power_level);
  68
  69         if (power != sdata->vif.bss_conf.txpower) {
  70                 sdata->vif.bss_conf.txpower = power;
  71                 ieee80211_hw_config(sdata->local, 0);
  72                 return true;
  73         }
  74
  75         return false;
  76 }
  77
  78 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
  79                               bool update_bss)
  80 {
  81         if (__ieee80211_recalc_txpower(sdata) ||
  82             (update_bss && ieee80211_sdata_running(sdata)))
  83                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  84 }
  85
  86 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
  87 {
  88         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  89                 return 0;
  90
  91         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  92         return IEEE80211_CONF_CHANGE_IDLE;
  93 }
  94
  95 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  96 {
  97         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  98                 return 0;
  99
 100         ieee80211_flush_queues(local, NULL, false);
 101
 102         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 103         return IEEE80211_CONF_CHANGE_IDLE;
 104 }
 105
 106 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
 107                                    bool force_active)
 108 {
 109         bool working, scanning, active;
 110         unsigned int led_trig_start = 0, led_trig_stop = 0;
 111
 112         lockdep_assert_held(&local->mtx);
 113
 114         active = force_active ||
 115                  !list_empty(&local->chanctx_list) ||
 116                  local->monitors;
 117
 118         working = !local->ops->remain_on_channel &&
 119                   !list_empty(&local->roc_list);
 120
 121         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 122                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 123
 124         if (working || scanning)
 125                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 126         else
 127                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 128
 129         if (active)
 130                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 131         else
 132                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 133
 134         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 135
 136         if (working || scanning || active)
 137                 return __ieee80211_idle_off(local);
 138         return __ieee80211_idle_on(local);
 139 }
 140
 141 u32 ieee80211_idle_off(struct ieee80211_local *local)
 142 {
 143         return __ieee80211_recalc_idle(local, true);
 144 }
 145
 146 void ieee80211_recalc_idle(struct ieee80211_local *local)
 147 {
 148         u32 change = __ieee80211_recalc_idle(local, false);
 149         if (change)
 150                 ieee80211_hw_config(local, change);
 151 }
 152
 153 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 154 {
 155         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
 156                 return -EINVAL;
 157
 158         dev->mtu = new_mtu;
 159         return 0;
 160 }
 161
 162 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 163                                 bool check_dup)
 164 {
 165         struct ieee80211_local *local = sdata->local;
 166         struct ieee80211_sub_if_data *iter;
 167         u64 new, mask, tmp;
 168         u8 *m;
 169         int ret = 0;
 170
 171         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 172                 return 0;
 173
 174         m = addr;
 175         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 176                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 177                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 178
 179         m = local->hw.wiphy->addr_mask;
 180         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 181                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 182                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 183
 184         if (!check_dup)
 185                 return ret;
 186
 187         mutex_lock(&local->iflist_mtx);
 188         list_for_each_entry(iter, &local->interfaces, list) {
 189                 if (iter == sdata)
 190                         continue;
 191
 192                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 193                     !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 194                         continue;
 195
 196                 m = iter->vif.addr;
 197                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 198                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 199                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 200
 201                 if ((new & ~mask) != (tmp & ~mask)) {
 202                         ret = -EINVAL;
 203                         break;
 204                 }
 205         }
 206         mutex_unlock(&local->iflist_mtx);
 207
 208         return ret;
 209 }
 210
 211 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 212 {
 213         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 214         struct sockaddr *sa = addr;
 215         bool check_dup = true;
 216         int ret;
 217
 218         if (ieee80211_sdata_running(sdata))
 219                 return -EBUSY;
 220
 221         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 222             !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 223                 check_dup = false;
 224
 225         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 226         if (ret)
 227                 return ret;
 228
 229         ret = eth_mac_addr(dev, sa);
 230
 231         if (ret == 0)
 232                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 233
 234         return ret;
 235 }
 236
 237 static inline int identical_mac_addr_allowed(int type1, int type2)
 238 {
 239         return type1 == NL80211_IFTYPE_MONITOR ||
 240                 type2 == NL80211_IFTYPE_MONITOR ||
 241                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 242                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 243                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 244                 (type1 == NL80211_IFTYPE_WDS &&
 245                         (type2 == NL80211_IFTYPE_WDS ||
 246                          type2 == NL80211_IFTYPE_AP)) ||
 247                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 248                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 249                         (type2 == NL80211_IFTYPE_AP ||
 250                          type2 == NL80211_IFTYPE_AP_VLAN));
 251 }
 252
 253 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 254                                             enum nl80211_iftype iftype)
 255 {
 256         struct ieee80211_local *local = sdata->local;
 257         struct ieee80211_sub_if_data *nsdata;
 258         int ret;
 259
 260         ASSERT_RTNL();
 261
 262         /* we hold the RTNL here so can safely walk the list */
 263         list_for_each_entry(nsdata, &local->interfaces, list) {
 264                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 265                         /*
 266                          * Only OCB and monitor mode may coexist
 267                          */
 268                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
 269                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
 270                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 271                              nsdata->vif.type == NL80211_IFTYPE_OCB))
 272                                 return -EBUSY;
 273
 274                         /*
 275                          * Allow only a single IBSS interface to be up at any
 276                          * time. This is restricted because beacon distribution
 277                          * cannot work properly if both are in the same IBSS.
 278                          *
 279                          * To remove this restriction we'd have to disallow them
 280                          * from setting the same SSID on different IBSS interfaces
 281                          * belonging to the same hardware. Then, however, we're
 282                          * faced with having to adopt two different TSF timers...
 283                          */
 284                         if (iftype == NL80211_IFTYPE_ADHOC &&
 285                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 286                                 return -EBUSY;
 287                         /*
 288                          * will not add another interface while any channel
 289                          * switch is active.
 290                          */
 291                         if (nsdata->vif.csa_active)
 292                                 return -EBUSY;
 293
 294                         /*
 295                          * The remaining checks are only performed for interfaces
 296                          * with the same MAC address.
 297                          */
 298                         if (!ether_addr_equal(sdata->vif.addr,
 299                                               nsdata->vif.addr))
 300                                 continue;
 301
 302                         /*
 303                          * check whether it may have the same address
 304                          */
 305                         if (!identical_mac_addr_allowed(iftype,
 306                                                         nsdata->vif.type))
 307                                 return -ENOTUNIQ;
 308
 309                         /*
 310                          * can only add VLANs to enabled APs
 311                          */
 312                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 313                             nsdata->vif.type == NL80211_IFTYPE_AP)
 314                                 sdata->bss = &nsdata->u.ap;
 315                 }
 316         }
 317
 318         mutex_lock(&local->chanctx_mtx);
 319         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
 320         mutex_unlock(&local->chanctx_mtx);
 321         return ret;
 322 }
 323
 324 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 325                                   enum nl80211_iftype iftype)
 326 {
 327         int n_queues = sdata->local->hw.queues;
 328         int i;
 329
 330         if (iftype == NL80211_IFTYPE_NAN)
 331                 return 0;
 332
 333         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 334                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 335                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 336                                          IEEE80211_INVAL_HW_QUEUE))
 337                                 return -EINVAL;
 338                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 339                                          n_queues))
 340                                 return -EINVAL;
 341                 }
 342         }
 343
 344         if ((iftype != NL80211_IFTYPE_AP &&
 345              iftype != NL80211_IFTYPE_P2P_GO &&
 346              iftype != NL80211_IFTYPE_MESH_POINT) ||
 347             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
 348                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 349                 return 0;
 350         }
 351
 352         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 353                 return -EINVAL;
 354
 355         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 356                 return -EINVAL;
 357
 358         return 0;
 359 }
 360
 361 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 362                                     const int offset)
 363 {
 364         struct ieee80211_local *local = sdata->local;
 365         u32 flags = sdata->u.mntr.flags;
 366
 367 #define ADJUST(_f, _s)  do {                                    \
 368         if (flags & MONITOR_FLAG_##_f)                          \
 369                 local->fif_##_s += offset;                      \
 370         } while (0)
 371
 372         ADJUST(FCSFAIL, fcsfail);
 373         ADJUST(PLCPFAIL, plcpfail);
 374         ADJUST(CONTROL, control);
 375         ADJUST(CONTROL, pspoll);
 376         ADJUST(OTHER_BSS, other_bss);
 377
 378 #undef ADJUST
 379 }
 380
 381 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 382 {
 383         struct ieee80211_local *local = sdata->local;
 384         int i;
 385
 386         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 387                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
 388                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 389                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 390                         sdata->vif.hw_queue[i] = i;
 391                 else
 392                         sdata->vif.hw_queue[i] = 0;
 393         }
 394         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 395 }
 396
 397 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 398 {
 399         struct ieee80211_sub_if_data *sdata;
 400         int ret;
 401
 402         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 403                 return 0;
 404
 405         ASSERT_RTNL();
 406
 407         if (local->monitor_sdata)
 408                 return 0;
 409
 410         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 411         if (!sdata)
 412                 return -ENOMEM;
 413
 414         /* set up data */
 415         sdata->local = local;
 416         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 417         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 418                  wiphy_name(local->hw.wiphy));
 419         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
 420
 421         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 422
 423         ieee80211_set_default_queues(sdata);
 424
 425         ret = drv_add_interface(local, sdata);
 426         if (WARN_ON(ret)) {
 427                 /* ok .. stupid driver, it asked for this! */
 428                 kfree(sdata);
 429                 return ret;
 430         }
 431
 432         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 433         if (ret) {
 434                 kfree(sdata);
 435                 return ret;
 436         }
 437
 438         mutex_lock(&local->iflist_mtx);
 439         rcu_assign_pointer(local->monitor_sdata, sdata);
 440         mutex_unlock(&local->iflist_mtx);
 441
 442         mutex_lock(&local->mtx);
 443         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 444                                         IEEE80211_CHANCTX_EXCLUSIVE);
 445         mutex_unlock(&local->mtx);
 446         if (ret) {
 447                 mutex_lock(&local->iflist_mtx);
 448                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
 449                 mutex_unlock(&local->iflist_mtx);
 450                 synchronize_net();
 451                 drv_remove_interface(local, sdata);
 452                 kfree(sdata);
 453                 return ret;
 454         }
 455
 456         skb_queue_head_init(&sdata->skb_queue);
 457         INIT_WORK(&sdata->work, ieee80211_iface_work);
 458
 459         return 0;
 460 }
 461
 462 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 463 {
 464         struct ieee80211_sub_if_data *sdata;
 465
 466         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 467                 return;
 468
 469         ASSERT_RTNL();
 470
 471         mutex_lock(&local->iflist_mtx);
 472
 473         sdata = rcu_dereference_protected(local->monitor_sdata,
 474                                           lockdep_is_held(&local->iflist_mtx));
 475         if (!sdata) {
 476                 mutex_unlock(&local->iflist_mtx);
 477                 return;
 478         }
 479
 480         RCU_INIT_POINTER(local->monitor_sdata, NULL);
 481         mutex_unlock(&local->iflist_mtx);
 482
 483         synchronize_net();
 484
 485         mutex_lock(&local->mtx);
 486         ieee80211_vif_release_channel(sdata);
 487         mutex_unlock(&local->mtx);
 488
 489         drv_remove_interface(local, sdata);
 490
 491         kfree(sdata);
 492 }
 493
 494 /*
 495  * NOTE: Be very careful when changing this function, it must NOT return
 496  * an error on interface type changes that have been pre-checked, so most
 497  * checks should be in ieee80211_check_concurrent_iface.
 498  */
 499 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 500 {
 501         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 502         struct net_device *dev = wdev->netdev;
 503         struct ieee80211_local *local = sdata->local;
 504         struct sta_info *sta;
 505         u32 changed = 0;
 506         int res;
 507         u32 hw_reconf_flags = 0;
 508
 509         switch (sdata->vif.type) {
 510         case NL80211_IFTYPE_WDS:
 511                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 512                         return -ENOLINK;
 513                 break;
 514         case NL80211_IFTYPE_AP_VLAN: {
 515                 struct ieee80211_sub_if_data *master;
 516
 517                 if (!sdata->bss)
 518                         return -ENOLINK;
 519
 520                 mutex_lock(&local->mtx);
 521                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 522                 mutex_unlock(&local->mtx);
 523
 524                 master = container_of(sdata->bss,
 525                                       struct ieee80211_sub_if_data, u.ap);
 526                 sdata->control_port_protocol =
 527                         master->control_port_protocol;
 528                 sdata->control_port_no_encrypt =
 529                         master->control_port_no_encrypt;
 530                 sdata->vif.cab_queue = master->vif.cab_queue;
 531                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
 532                        sizeof(sdata->vif.hw_queue));
 533                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
 534
 535                 mutex_lock(&local->key_mtx);
 536                 sdata->crypto_tx_tailroom_needed_cnt +=
 537                         master->crypto_tx_tailroom_needed_cnt;
 538                 mutex_unlock(&local->key_mtx);
 539
 540                 break;
 541                 }
 542         case NL80211_IFTYPE_AP:
 543                 sdata->bss = &sdata->u.ap;
 544                 break;
 545         case NL80211_IFTYPE_MESH_POINT:
 546         case NL80211_IFTYPE_STATION:
 547         case NL80211_IFTYPE_MONITOR:
 548         case NL80211_IFTYPE_ADHOC:
 549         case NL80211_IFTYPE_P2P_DEVICE:
 550         case NL80211_IFTYPE_OCB:
 551         case NL80211_IFTYPE_NAN:
 552                 /* no special treatment */
 553                 break;
 554         case NL80211_IFTYPE_UNSPECIFIED:
 555         case NUM_NL80211_IFTYPES:
 556         case NL80211_IFTYPE_P2P_CLIENT:
 557         case NL80211_IFTYPE_P2P_GO:
 558                 /* cannot happen */
 559                 WARN_ON(1);
 560                 break;
 561         }
 562
 563         if (local->open_count == 0) {
 564                 res = drv_start(local);
 565                 if (res)
 566                         goto err_del_bss;
 567                 /* we're brought up, everything changes */
 568                 hw_reconf_flags = ~0;
 569                 ieee80211_led_radio(local, true);
 570                 ieee80211_mod_tpt_led_trig(local,
 571                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 572         }
 573
 574         /*
 575          * Copy the hopefully now-present MAC address to
 576          * this interface, if it has the special null one.
 577          */
 578         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 579                 memcpy(dev->dev_addr,
 580                        local->hw.wiphy->perm_addr,
 581                        ETH_ALEN);
 582                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 583
 584                 if (!is_valid_ether_addr(dev->dev_addr)) {
 585                         res = -EADDRNOTAVAIL;
 586                         goto err_stop;
 587                 }
 588         }
 589
 590         switch (sdata->vif.type) {
 591         case NL80211_IFTYPE_AP_VLAN:
 592                 /* no need to tell driver, but set carrier and chanctx */
 593                 if (rtnl_dereference(sdata->bss->beacon)) {
 594                         ieee80211_vif_vlan_copy_chanctx(sdata);
 595                         netif_carrier_on(dev);
 596                 } else {
 597                         netif_carrier_off(dev);
 598                 }
 599                 break;
 600         case NL80211_IFTYPE_MONITOR:
 601                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 602                         local->cooked_mntrs++;
 603                         break;
 604                 }
 605
 606                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
 607                         res = drv_add_interface(local, sdata);
 608                         if (res)
 609                                 goto err_stop;
 610                 } else if (local->monitors == 0 && local->open_count == 0) {
 611                         res = ieee80211_add_virtual_monitor(local);
 612                         if (res)
 613                                 goto err_stop;
 614                 }
 615
 616                 /* must be before the call to ieee80211_configure_filter */
 617                 local->monitors++;
 618                 if (local->monitors == 1) {
 619                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 620                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 621                 }
 622
 623                 ieee80211_adjust_monitor_flags(sdata, 1);
 624                 ieee80211_configure_filter(local);
 625                 mutex_lock(&local->mtx);
 626                 ieee80211_recalc_idle(local);
 627                 mutex_unlock(&local->mtx);
 628
 629                 netif_carrier_on(dev);
 630                 break;
 631         default:
 632                 if (coming_up) {
 633                         ieee80211_del_virtual_monitor(local);
 634
 635                         res = drv_add_interface(local, sdata);
 636                         if (res)
 637                                 goto err_stop;
 638                         res = ieee80211_check_queues(sdata,
 639                                 ieee80211_vif_type_p2p(&sdata->vif));
 640                         if (res)
 641                                 goto err_del_interface;
 642                 }
 643
 644                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 645                         local->fif_pspoll++;
 646                         local->fif_probe_req++;
 647
 648                         ieee80211_configure_filter(local);
 649                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 650                         local->fif_probe_req++;
 651                 }
 652
 653                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
 654                     sdata->vif.type != NL80211_IFTYPE_NAN)
 655                         changed |= ieee80211_reset_erp_info(sdata);
 656                 ieee80211_bss_info_change_notify(sdata, changed);
 657
 658                 switch (sdata->vif.type) {
 659                 case NL80211_IFTYPE_STATION:
 660                 case NL80211_IFTYPE_ADHOC:
 661                 case NL80211_IFTYPE_AP:
 662                 case NL80211_IFTYPE_MESH_POINT:
 663                 case NL80211_IFTYPE_OCB:
 664                         netif_carrier_off(dev);
 665                         break;
 666                 case NL80211_IFTYPE_WDS:
 667                 case NL80211_IFTYPE_P2P_DEVICE:
 668                 case NL80211_IFTYPE_NAN:
 669                         break;
 670                 default:
 671                         /* not reached */
 672                         WARN_ON(1);
 673                 }
 674
 675                 /*
 676                  * Set default queue parameters so drivers don't
 677                  * need to initialise the hardware if the hardware
 678                  * doesn't start up with sane defaults.
 679                  * Enable QoS for anything but station interfaces.
 680                  */
 681                 ieee80211_set_wmm_default(sdata, true,
 682                         sdata->vif.type != NL80211_IFTYPE_STATION);
 683         }
 684
 685         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 686
 687         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 688                 /* Create STA entry for the WDS peer */
 689                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 690                                      GFP_KERNEL);
 691                 if (!sta) {
 692                         res = -ENOMEM;
 693                         goto err_del_interface;
 694                 }
 695
 696                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 697                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 698                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 699
 700                 res = sta_info_insert(sta);
 701                 if (res) {
 702                         /* STA has been freed */
 703                         goto err_del_interface;
 704                 }
 705
 706                 rate_control_rate_init(sta);
 707                 netif_carrier_on(dev);
 708         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 709                 rcu_assign_pointer(local->p2p_sdata, sdata);
 710         }
 711
 712         /*
 713          * set_multicast_list will be invoked by the networking core
 714          * which will check whether any increments here were done in
 715          * error and sync them down to the hardware as filter flags.
 716          */
 717         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 718                 atomic_inc(&local->iff_allmultis);
 719
 720         if (coming_up)
 721                 local->open_count++;
 722
 723         if (hw_reconf_flags)
 724                 ieee80211_hw_config(local, hw_reconf_flags);
 725
 726         ieee80211_recalc_ps(local);
 727
 728         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 729             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 730                 /* XXX: for AP_VLAN, actually track AP queues */
 731                 netif_tx_start_all_queues(dev);
 732         } else if (dev) {
 733                 unsigned long flags;
 734                 int n_acs = IEEE80211_NUM_ACS;
 735                 int ac;
 736
 737                 if (local->hw.queues < IEEE80211_NUM_ACS)
 738                         n_acs = 1;
 739
 740                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 741                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 742                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 743                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 744                         for (ac = 0; ac < n_acs; ac++) {
 745                                 int ac_queue = sdata->vif.hw_queue[ac];
 746
 747                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 748                                     skb_queue_empty(&local->pending[ac_queue]))
 749                                         netif_start_subqueue(dev, ac);
 750                         }
 751                 }
 752                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 753         }
 754
 755         return 0;
 756  err_del_interface:
 757         drv_remove_interface(local, sdata);
 758  err_stop:
 759         if (!local->open_count)
 760                 drv_stop(local);
 761  err_del_bss:
 762         sdata->bss = NULL;
 763         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 764                 mutex_lock(&local->mtx);
 765                 list_del(&sdata->u.vlan.list);
 766                 mutex_unlock(&local->mtx);
 767         }
 768         /* might already be clear but that doesn't matter */
 769         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 770         return res;
 771 }
 772
 773 static int ieee80211_open(struct net_device *dev)
 774 {
 775         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 776         int err;
 777
 778         /* fail early if user set an invalid address */
 779         if (!is_valid_ether_addr(dev->dev_addr))
 780                 return -EADDRNOTAVAIL;
 781
 782         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 783         if (err)
 784                 return err;
 785
 786         return ieee80211_do_open(&sdata->wdev, true);
 787 }
 788
 789 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 790                               bool going_down)
 791 {
 792         struct ieee80211_local *local = sdata->local;
 793         struct fq *fq = &local->fq;
 794         unsigned long flags;
 795         struct sk_buff *skb, *tmp;
 796         u32 hw_reconf_flags = 0;
 797         int i, flushed;
 798         struct ps_data *ps;
 799         struct cfg80211_chan_def chandef;
 800         bool cancel_scan;
 801         struct cfg80211_nan_func *func;
 802
 803         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 804
 805         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 806         if (cancel_scan)
 807                 ieee80211_scan_cancel(local);
 808
 809         /*
 810          * Stop TX on this interface first.
 811          */
 812         if (sdata->dev)
 813                 netif_tx_stop_all_queues(sdata->dev);
 814
 815         ieee80211_roc_purge(local, sdata);
 816
 817         switch (sdata->vif.type) {
 818         case NL80211_IFTYPE_STATION:
 819                 ieee80211_mgd_stop(sdata);
 820                 break;
 821         case NL80211_IFTYPE_ADHOC:
 822                 ieee80211_ibss_stop(sdata);
 823                 break;
 824         case NL80211_IFTYPE_AP:
 825                 cancel_work_sync(&sdata->u.ap.request_smps_work);
 826                 break;
 827         default:
 828                 break;
 829         }
 830
 831         /*
 832          * Remove all stations associated with this interface.
 833          *
 834          * This must be done before calling ops->remove_interface()
 835          * because otherwise we can later invoke ops->sta_notify()
 836          * whenever the STAs are removed, and that invalidates driver
 837          * assumptions about always getting a vif pointer that is valid
 838          * (because if we remove a STA after ops->remove_interface()
 839          * the driver will have removed the vif info already!)
 840          *
 841          * In WDS mode a station must exist here and be flushed, for
 842          * AP_VLANs stations may exist since there's nothing else that
 843          * would have removed them, but in other modes there shouldn't
 844          * be any stations.
 845          */
 846         flushed = sta_info_flush(sdata);
 847         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
 848                      ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 849                       (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
 850
 851         /* don't count this interface for allmulti while it is down */
 852         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 853                 atomic_dec(&local->iff_allmultis);
 854
 855         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 856                 local->fif_pspoll--;
 857                 local->fif_probe_req--;
 858         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 859                 local->fif_probe_req--;
 860         }
 861
 862         if (sdata->dev) {
 863                 netif_addr_lock_bh(sdata->dev);
 864                 spin_lock_bh(&local->filter_lock);
 865                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 866                                  sdata->dev->addr_len);
 867                 spin_unlock_bh(&local->filter_lock);
 868                 netif_addr_unlock_bh(sdata->dev);
 869         }
 870
 871         del_timer_sync(&local->dynamic_ps_timer);
 872         cancel_work_sync(&local->dynamic_ps_enable_work);
 873
 874         cancel_work_sync(&sdata->recalc_smps);
 875         sdata_lock(sdata);
 876         mutex_lock(&local->mtx);
 877         sdata->vif.csa_active = false;
 878         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 879                 sdata->u.mgd.csa_waiting_bcn = false;
 880         if (sdata->csa_block_tx) {
 881                 ieee80211_wake_vif_queues(local, sdata,
 882                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 883                 sdata->csa_block_tx = false;
 884         }
 885         mutex_unlock(&local->mtx);
 886         sdata_unlock(sdata);
 887
 888         cancel_work_sync(&sdata->csa_finalize_work);
 889
 890         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 891
 892         if (sdata->wdev.cac_started) {
 893                 chandef = sdata->vif.bss_conf.chandef;
 894                 WARN_ON(local->suspended);
 895                 mutex_lock(&local->mtx);
 896                 ieee80211_vif_release_channel(sdata);
 897                 mutex_unlock(&local->mtx);
 898                 cfg80211_cac_event(sdata->dev, &chandef,
 899                                    NL80211_RADAR_CAC_ABORTED,
 900                                    GFP_KERNEL);
 901         }
 902
 903         /* APs need special treatment */
 904         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 905                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 906
 907                 /* down all dependent devices, that is VLANs */
 908                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 909                                          u.vlan.list)
 910                         dev_close(vlan->dev);
 911                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 912         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 913                 /* remove all packets in parent bc_buf pointing to this dev */
 914                 ps = &sdata->bss->ps;
 915
 916                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 917                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 918                         if (skb->dev == sdata->dev) {
 919                                 __skb_unlink(skb, &ps->bc_buf);
 920                                 local->total_ps_buffered--;
 921                                 ieee80211_free_txskb(&local->hw, skb);
 922                         }
 923                 }
 924                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 925         }
 926
 927         if (going_down)
 928                 local->open_count--;
 929
 930         switch (sdata->vif.type) {
 931         case NL80211_IFTYPE_AP_VLAN:
 932                 mutex_lock(&local->mtx);
 933                 list_del(&sdata->u.vlan.list);
 934                 mutex_unlock(&local->mtx);
 935                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 936                 /* see comment in the default case below */
 937                 ieee80211_free_keys(sdata, true);
 938                 /* no need to tell driver */
 939                 break;
 940         case NL80211_IFTYPE_MONITOR:
 941                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 942                         local->cooked_mntrs--;
 943                         break;
 944                 }
 945
 946                 local->monitors--;
 947                 if (local->monitors == 0) {
 948                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 949                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 950                 }
 951
 952                 ieee80211_adjust_monitor_flags(sdata, -1);
 953                 break;
 954         case NL80211_IFTYPE_NAN:
 955                 /* clean all the functions */
 956                 spin_lock_bh(&sdata->u.nan.func_lock);
 957
 958                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
 959                         idr_remove(&sdata->u.nan.function_inst_ids, i);
 960                         cfg80211_free_nan_func(func);
 961                 }
 962                 idr_destroy(&sdata->u.nan.function_inst_ids);
 963
 964                 spin_unlock_bh(&sdata->u.nan.func_lock);
 965                 break;
 966         case NL80211_IFTYPE_P2P_DEVICE:
 967                 /* relies on synchronize_rcu() below */
 968                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 969                 /* fall through */
 970         default:
 971                 cancel_work_sync(&sdata->work);
 972                 /*
 973                  * When we get here, the interface is marked down.
 974                  * Free the remaining keys, if there are any
 975                  * (which can happen in AP mode if userspace sets
 976                  * keys before the interface is operating, and maybe
 977                  * also in WDS mode)
 978                  *
 979                  * Force the key freeing to always synchronize_net()
 980                  * to wait for the RX path in case it is using this
 981                  * interface enqueuing frames at this very time on
 982                  * another CPU.
 983                  */
 984                 ieee80211_free_keys(sdata, true);
 985                 skb_queue_purge(&sdata->skb_queue);
 986         }
 987
 988         sdata->bss = NULL;
 989
 990         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 991         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 992                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 993                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 994                         if (info->control.vif == &sdata->vif) {
 995                                 __skb_unlink(skb, &local->pending[i]);
 996                                 ieee80211_free_txskb(&local->hw, skb);
 997                         }
 998                 }
 999         }
1000         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1001
1002         if (sdata->vif.txq) {
1003                 struct txq_info *txqi = to_txq_info(sdata->vif.txq);
1004
1005                 spin_lock_bh(&fq->lock);
1006                 ieee80211_txq_purge(local, txqi);
1007                 spin_unlock_bh(&fq->lock);
1008         }
1009
1010         if (local->open_count == 0)
1011                 ieee80211_clear_tx_pending(local);
1012
1013         /*
1014          * If the interface goes down while suspended, presumably because
1015          * the device was unplugged and that happens before our resume,
1016          * then the driver is already unconfigured and the remainder of
1017          * this function isn't needed.
1018          * XXX: what about WoWLAN? If the device has software state, e.g.
1019          *      memory allocated, it might expect teardown commands from
1020          *      mac80211 here?
1021          */
1022         if (local->suspended) {
1023                 WARN_ON(local->wowlan);
1024                 WARN_ON(rtnl_dereference(local->monitor_sdata));
1025                 return;
1026         }
1027
1028         switch (sdata->vif.type) {
1029         case NL80211_IFTYPE_AP_VLAN:
1030                 break;
1031         case NL80211_IFTYPE_MONITOR:
1032                 if (local->monitors == 0)
1033                         ieee80211_del_virtual_monitor(local);
1034
1035                 mutex_lock(&local->mtx);
1036                 ieee80211_recalc_idle(local);
1037                 mutex_unlock(&local->mtx);
1038
1039                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1040                         break;
1041
1042                 /* fall through */
1043         default:
1044                 if (going_down)
1045                         drv_remove_interface(local, sdata);
1046         }
1047
1048         ieee80211_recalc_ps(local);
1049
1050         if (cancel_scan)
1051                 flush_delayed_work(&local->scan_work);
1052
1053         if (local->open_count == 0) {
1054                 ieee80211_stop_device(local);
1055
1056                 /* no reconfiguring after stop! */
1057                 return;
1058         }
1059
1060         /* do after stop to avoid reconfiguring when we stop anyway */
1061         ieee80211_configure_filter(local);
1062         ieee80211_hw_config(local, hw_reconf_flags);
1063
1064         if (local->monitors == local->open_count)
1065                 ieee80211_add_virtual_monitor(local);
1066 }
1067
1068 static int ieee80211_stop(struct net_device *dev)
1069 {
1070         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1071
1072         ieee80211_do_stop(sdata, true);
1073
1074         return 0;
1075 }
1076
1077 static void ieee80211_set_multicast_list(struct net_device *dev)
1078 {
1079         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1080         struct ieee80211_local *local = sdata->local;
1081         int allmulti, sdata_allmulti;
1082
1083         allmulti = !!(dev->flags & IFF_ALLMULTI);
1084         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1085
1086         if (allmulti != sdata_allmulti) {
1087                 if (dev->flags & IFF_ALLMULTI)
1088                         atomic_inc(&local->iff_allmultis);
1089                 else
1090                         atomic_dec(&local->iff_allmultis);
1091                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1092         }
1093
1094         spin_lock_bh(&local->filter_lock);
1095         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1096         spin_unlock_bh(&local->filter_lock);
1097         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1098 }
1099
1100 /*
1101  * Called when the netdev is removed or, by the code below, before
1102  * the interface type changes.
1103  */
1104 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1105 {
1106         int i;
1107
1108         /* free extra data */
1109         ieee80211_free_keys(sdata, false);
1110
1111         ieee80211_debugfs_remove_netdev(sdata);
1112
1113         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1114                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1115         sdata->fragment_next = 0;
1116
1117         if (ieee80211_vif_is_mesh(&sdata->vif))
1118                 ieee80211_mesh_teardown_sdata(sdata);
1119 }
1120
1121 static void ieee80211_uninit(struct net_device *dev)
1122 {
1123         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1124 }
1125
1126 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1127                                          struct sk_buff *skb,
1128                                          void *accel_priv,
1129                                          select_queue_fallback_t fallback)
1130 {
1131         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1132 }
1133
1134 static struct rtnl_link_stats64 *
1135 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1136 {
1137         int i;
1138
1139         for_each_possible_cpu(i) {
1140                 const struct pcpu_sw_netstats *tstats;
1141                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1142                 unsigned int start;
1143
1144                 tstats = per_cpu_ptr(dev->tstats, i);
1145
1146                 do {
1147                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
1148                         rx_packets = tstats->rx_packets;
1149                         tx_packets = tstats->tx_packets;
1150                         rx_bytes = tstats->rx_bytes;
1151                         tx_bytes = tstats->tx_bytes;
1152                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1153
1154                 stats->rx_packets += rx_packets;
1155                 stats->tx_packets += tx_packets;
1156                 stats->rx_bytes   += rx_bytes;
1157                 stats->tx_bytes   += tx_bytes;
1158         }
1159
1160         return stats;
1161 }
1162
1163 static const struct net_device_ops ieee80211_dataif_ops = {
1164         .ndo_open               = ieee80211_open,
1165         .ndo_stop               = ieee80211_stop,
1166         .ndo_uninit             = ieee80211_uninit,
1167         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1168         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1169         .ndo_change_mtu         = ieee80211_change_mtu,
1170         .ndo_set_mac_address    = ieee80211_change_mac,
1171         .ndo_select_queue       = ieee80211_netdev_select_queue,
1172         .ndo_get_stats64        = ieee80211_get_stats64,
1173 };
1174
1175 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1176                                           struct sk_buff *skb,
1177                                           void *accel_priv,
1178                                           select_queue_fallback_t fallback)
1179 {
1180         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1181         struct ieee80211_local *local = sdata->local;
1182         struct ieee80211_hdr *hdr;
1183         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1184
1185         if (local->hw.queues < IEEE80211_NUM_ACS)
1186                 return 0;
1187
1188         if (skb->len < 4 ||
1189             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1190                 return 0; /* doesn't matter, frame will be dropped */
1191
1192         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1193
1194         return ieee80211_select_queue_80211(sdata, skb, hdr);
1195 }
1196
1197 static const struct net_device_ops ieee80211_monitorif_ops = {
1198         .ndo_open               = ieee80211_open,
1199         .ndo_stop               = ieee80211_stop,
1200         .ndo_uninit             = ieee80211_uninit,
1201         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1202         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1203         .ndo_change_mtu         = ieee80211_change_mtu,
1204         .ndo_set_mac_address    = ieee80211_change_mac,
1205         .ndo_select_queue       = ieee80211_monitor_select_queue,
1206         .ndo_get_stats64        = ieee80211_get_stats64,
1207 };
1208
1209 static void ieee80211_if_free(struct net_device *dev)
1210 {
1211         free_percpu(dev->tstats);
1212         free_netdev(dev);
1213 }
1214
1215 static void ieee80211_if_setup(struct net_device *dev)
1216 {
1217         ether_setup(dev);
1218         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1219         dev->netdev_ops = &ieee80211_dataif_ops;
1220         dev->destructor = ieee80211_if_free;
1221 }
1222
1223 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1224 {
1225         ieee80211_if_setup(dev);
1226         dev->priv_flags |= IFF_NO_QUEUE;
1227 }
1228
1229 static void ieee80211_iface_work(struct work_struct *work)
1230 {
1231         struct ieee80211_sub_if_data *sdata =
1232                 container_of(work, struct ieee80211_sub_if_data, work);
1233         struct ieee80211_local *local = sdata->local;
1234         struct sk_buff *skb;
1235         struct sta_info *sta;
1236         struct ieee80211_ra_tid *ra_tid;
1237         struct ieee80211_rx_agg *rx_agg;
1238
1239         if (!ieee80211_sdata_running(sdata))
1240                 return;
1241
1242         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1243                 return;
1244
1245         if (!ieee80211_can_run_worker(local))
1246                 return;
1247
1248         /* first process frames */
1249         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1250                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1251
1252                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1253                         ra_tid = (void *)&skb->cb;
1254                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1255                                                  ra_tid->tid);
1256                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1257                         ra_tid = (void *)&skb->cb;
1258                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1259                                                 ra_tid->tid);
1260                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_START) {
1261                         rx_agg = (void *)&skb->cb;
1262                         mutex_lock(&local->sta_mtx);
1263                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1264                         if (sta)
1265                                 __ieee80211_start_rx_ba_session(sta,
1266                                                 0, 0, 0, 1, rx_agg->tid,
1267                                                 IEEE80211_MAX_AMPDU_BUF,
1268                                                 false, true);
1269                         mutex_unlock(&local->sta_mtx);
1270                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_RX_AGG_STOP) {
1271                         rx_agg = (void *)&skb->cb;
1272                         mutex_lock(&local->sta_mtx);
1273                         sta = sta_info_get_bss(sdata, rx_agg->addr);
1274                         if (sta)
1275                                 __ieee80211_stop_rx_ba_session(sta,
1276                                                         rx_agg->tid,
1277                                                         WLAN_BACK_RECIPIENT, 0,
1278                                                         false);
1279                         mutex_unlock(&local->sta_mtx);
1280                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1281                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1282                         int len = skb->len;
1283
1284                         mutex_lock(&local->sta_mtx);
1285                         sta = sta_info_get_bss(sdata, mgmt->sa);
1286                         if (sta) {
1287                                 switch (mgmt->u.action.u.addba_req.action_code) {
1288                                 case WLAN_ACTION_ADDBA_REQ:
1289                                         ieee80211_process_addba_request(
1290                                                         local, sta, mgmt, len);
1291                                         break;
1292                                 case WLAN_ACTION_ADDBA_RESP:
1293                                         ieee80211_process_addba_resp(local, sta,
1294                                                                      mgmt, len);
1295                                         break;
1296                                 case WLAN_ACTION_DELBA:
1297                                         ieee80211_process_delba(sdata, sta,
1298                                                                 mgmt, len);
1299                                         break;
1300                                 default:
1301                                         WARN_ON(1);
1302                                         break;
1303                                 }
1304                         }
1305                         mutex_unlock(&local->sta_mtx);
1306                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1307                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1308                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1309                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1310                                 ieee80211_process_mu_groups(sdata, mgmt);
1311                                 break;
1312                         default:
1313                                 WARN_ON(1);
1314                                 break;
1315                         }
1316                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1317                         struct ieee80211_hdr *hdr = (void *)mgmt;
1318                         /*
1319                          * So the frame isn't mgmt, but frame_control
1320                          * is at the right place anyway, of course, so
1321                          * the if statement is correct.
1322                          *
1323                          * Warn if we have other data frame types here,
1324                          * they must not get here.
1325                          */
1326                         WARN_ON(hdr->frame_control &
1327                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1328                         WARN_ON(!(hdr->seq_ctrl &
1329                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1330                         /*
1331                          * This was a fragment of a frame, received while
1332                          * a block-ack session was active. That cannot be
1333                          * right, so terminate the session.
1334                          */
1335                         mutex_lock(&local->sta_mtx);
1336                         sta = sta_info_get_bss(sdata, mgmt->sa);
1337                         if (sta) {
1338                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1339                                                 IEEE80211_QOS_CTL_TID_MASK;
1340
1341                                 __ieee80211_stop_rx_ba_session(
1342                                         sta, tid, WLAN_BACK_RECIPIENT,
1343                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1344                                         true);
1345                         }
1346                         mutex_unlock(&local->sta_mtx);
1347                 } else switch (sdata->vif.type) {
1348                 case NL80211_IFTYPE_STATION:
1349                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1350                         break;
1351                 case NL80211_IFTYPE_ADHOC:
1352                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1353                         break;
1354                 case NL80211_IFTYPE_MESH_POINT:
1355                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1356                                 break;
1357                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1358                         break;
1359                 default:
1360                         WARN(1, "frame for unexpected interface type");
1361                         break;
1362                 }
1363
1364                 kfree_skb(skb);
1365         }
1366
1367         /* then other type-dependent work */
1368         switch (sdata->vif.type) {
1369         case NL80211_IFTYPE_STATION:
1370                 ieee80211_sta_work(sdata);
1371                 break;
1372         case NL80211_IFTYPE_ADHOC:
1373                 ieee80211_ibss_work(sdata);
1374                 break;
1375         case NL80211_IFTYPE_MESH_POINT:
1376                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1377                         break;
1378                 ieee80211_mesh_work(sdata);
1379                 break;
1380         case NL80211_IFTYPE_OCB:
1381                 ieee80211_ocb_work(sdata);
1382                 break;
1383         default:
1384                 break;
1385         }
1386 }
1387
1388 static void ieee80211_recalc_smps_work(struct work_struct *work)
1389 {
1390         struct ieee80211_sub_if_data *sdata =
1391                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1392
1393         ieee80211_recalc_smps(sdata);
1394 }
1395
1396 /*
1397  * Helper function to initialise an interface to a specific type.
1398  */
1399 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1400                                   enum nl80211_iftype type)
1401 {
1402         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1403                                                     0xff, 0xff, 0xff};
1404
1405         /* clear type-dependent union */
1406         memset(&sdata->u, 0, sizeof(sdata->u));
1407
1408         /* and set some type-dependent values */
1409         sdata->vif.type = type;
1410         sdata->vif.p2p = false;
1411         sdata->wdev.iftype = type;
1412
1413         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1414         sdata->control_port_no_encrypt = false;
1415         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1416         sdata->vif.bss_conf.idle = true;
1417
1418         sdata->noack_map = 0;
1419
1420         /* only monitor/p2p-device differ */
1421         if (sdata->dev) {
1422                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1423                 sdata->dev->type = ARPHRD_ETHER;
1424         }
1425
1426         skb_queue_head_init(&sdata->skb_queue);
1427         INIT_WORK(&sdata->work, ieee80211_iface_work);
1428         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1429         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1430         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1431         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1432
1433         switch (type) {
1434         case NL80211_IFTYPE_P2P_GO:
1435                 type = NL80211_IFTYPE_AP;
1436                 sdata->vif.type = type;
1437                 sdata->vif.p2p = true;
1438                 /* fall through */
1439         case NL80211_IFTYPE_AP:
1440                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1441                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1442                 INIT_WORK(&sdata->u.ap.request_smps_work,
1443                           ieee80211_request_smps_ap_work);
1444                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1445                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1446                 break;
1447         case NL80211_IFTYPE_P2P_CLIENT:
1448                 type = NL80211_IFTYPE_STATION;
1449                 sdata->vif.type = type;
1450                 sdata->vif.p2p = true;
1451                 /* fall through */
1452         case NL80211_IFTYPE_STATION:
1453                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1454                 ieee80211_sta_setup_sdata(sdata);
1455                 break;
1456         case NL80211_IFTYPE_OCB:
1457                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1458                 ieee80211_ocb_setup_sdata(sdata);
1459                 break;
1460         case NL80211_IFTYPE_ADHOC:
1461                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1462                 ieee80211_ibss_setup_sdata(sdata);
1463                 break;
1464         case NL80211_IFTYPE_MESH_POINT:
1465                 if (ieee80211_vif_is_mesh(&sdata->vif))
1466                         ieee80211_mesh_init_sdata(sdata);
1467                 break;
1468         case NL80211_IFTYPE_MONITOR:
1469                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1470                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1471                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1472                                       MONITOR_FLAG_OTHER_BSS;
1473                 break;
1474         case NL80211_IFTYPE_WDS:
1475                 sdata->vif.bss_conf.bssid = NULL;
1476                 break;
1477         case NL80211_IFTYPE_NAN:
1478                 idr_init(&sdata->u.nan.function_inst_ids);
1479                 spin_lock_init(&sdata->u.nan.func_lock);
1480                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1481                 break;
1482         case NL80211_IFTYPE_AP_VLAN:
1483         case NL80211_IFTYPE_P2P_DEVICE:
1484                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1485                 break;
1486         case NL80211_IFTYPE_UNSPECIFIED:
1487         case NUM_NL80211_IFTYPES:
1488                 BUG();
1489                 break;
1490         }
1491
1492         ieee80211_debugfs_add_netdev(sdata);
1493 }
1494
1495 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1496                                            enum nl80211_iftype type)
1497 {
1498         struct ieee80211_local *local = sdata->local;
1499         int ret, err;
1500         enum nl80211_iftype internal_type = type;
1501         bool p2p = false;
1502
1503         ASSERT_RTNL();
1504
1505         if (!local->ops->change_interface)
1506                 return -EBUSY;
1507
1508         switch (sdata->vif.type) {
1509         case NL80211_IFTYPE_AP:
1510         case NL80211_IFTYPE_STATION:
1511         case NL80211_IFTYPE_ADHOC:
1512         case NL80211_IFTYPE_OCB:
1513                 /*
1514                  * Could maybe also all others here?
1515                  * Just not sure how that interacts
1516                  * with the RX/config path e.g. for
1517                  * mesh.
1518                  */
1519                 break;
1520         default:
1521                 return -EBUSY;
1522         }
1523
1524         switch (type) {
1525         case NL80211_IFTYPE_AP:
1526         case NL80211_IFTYPE_STATION:
1527         case NL80211_IFTYPE_ADHOC:
1528         case NL80211_IFTYPE_OCB:
1529                 /*
1530                  * Could probably support everything
1531                  * but WDS here (WDS do_open can fail
1532                  * under memory pressure, which this
1533                  * code isn't prepared to handle).
1534                  */
1535                 break;
1536         case NL80211_IFTYPE_P2P_CLIENT:
1537                 p2p = true;
1538                 internal_type = NL80211_IFTYPE_STATION;
1539                 break;
1540         case NL80211_IFTYPE_P2P_GO:
1541                 p2p = true;
1542                 internal_type = NL80211_IFTYPE_AP;
1543                 break;
1544         default:
1545                 return -EBUSY;
1546         }
1547
1548         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1549         if (ret)
1550                 return ret;
1551
1552         ieee80211_do_stop(sdata, false);
1553
1554         ieee80211_teardown_sdata(sdata);
1555
1556         ret = drv_change_interface(local, sdata, internal_type, p2p);
1557         if (ret)
1558                 type = ieee80211_vif_type_p2p(&sdata->vif);
1559
1560         /*
1561          * Ignore return value here, there's not much we can do since
1562          * the driver changed the interface type internally already.
1563          * The warnings will hopefully make driver authors fix it :-)
1564          */
1565         ieee80211_check_queues(sdata, type);
1566
1567         ieee80211_setup_sdata(sdata, type);
1568
1569         err = ieee80211_do_open(&sdata->wdev, false);
1570         WARN(err, "type change: do_open returned %d", err);
1571
1572         return ret;
1573 }
1574
1575 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1576                              enum nl80211_iftype type)
1577 {
1578         int ret;
1579
1580         ASSERT_RTNL();
1581
1582         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1583                 return 0;
1584
1585         if (ieee80211_sdata_running(sdata)) {
1586                 ret = ieee80211_runtime_change_iftype(sdata, type);
1587                 if (ret)
1588                         return ret;
1589         } else {
1590                 /* Purge and reset type-dependent state. */
1591                 ieee80211_teardown_sdata(sdata);
1592                 ieee80211_setup_sdata(sdata, type);
1593         }
1594
1595         /* reset some values that shouldn't be kept across type changes */
1596         if (type == NL80211_IFTYPE_STATION)
1597                 sdata->u.mgd.use_4addr = false;
1598
1599         return 0;
1600 }
1601
1602 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1603                                        u8 *perm_addr, enum nl80211_iftype type)
1604 {
1605         struct ieee80211_sub_if_data *sdata;
1606         u64 mask, start, addr, val, inc;
1607         u8 *m;
1608         u8 tmp_addr[ETH_ALEN];
1609         int i;
1610
1611         /* default ... something at least */
1612         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1613
1614         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1615             local->hw.wiphy->n_addresses <= 1)
1616                 return;
1617
1618         mutex_lock(&local->iflist_mtx);
1619
1620         switch (type) {
1621         case NL80211_IFTYPE_MONITOR:
1622                 /* doesn't matter */
1623                 break;
1624         case NL80211_IFTYPE_WDS:
1625         case NL80211_IFTYPE_AP_VLAN:
1626                 /* match up with an AP interface */
1627                 list_for_each_entry(sdata, &local->interfaces, list) {
1628                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1629                                 continue;
1630                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1631                         break;
1632                 }
1633                 /* keep default if no AP interface present */
1634                 break;
1635         case NL80211_IFTYPE_P2P_CLIENT:
1636         case NL80211_IFTYPE_P2P_GO:
1637                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1638                         list_for_each_entry(sdata, &local->interfaces, list) {
1639                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1640                                         continue;
1641                                 if (!ieee80211_sdata_running(sdata))
1642                                         continue;
1643                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1644                                 goto out_unlock;
1645                         }
1646                 }
1647                 /* otherwise fall through */
1648         default:
1649                 /* assign a new address if possible -- try n_addresses first */
1650                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1651                         bool used = false;
1652
1653                         list_for_each_entry(sdata, &local->interfaces, list) {
1654                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1655                                                      sdata->vif.addr)) {
1656                                         used = true;
1657                                         break;
1658                                 }
1659                         }
1660
1661                         if (!used) {
1662                                 memcpy(perm_addr,
1663                                        local->hw.wiphy->addresses[i].addr,
1664                                        ETH_ALEN);
1665                                 break;
1666                         }
1667                 }
1668
1669                 /* try mask if available */
1670                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1671                         break;
1672
1673                 m = local->hw.wiphy->addr_mask;
1674                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1675                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1676                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1677
1678                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1679                         /* not a contiguous mask ... not handled now! */
1680                         pr_info("not contiguous\n");
1681                         break;
1682                 }
1683
1684                 /*
1685                  * Pick address of existing interface in case user changed
1686                  * MAC address manually, default to perm_addr.
1687                  */
1688                 m = local->hw.wiphy->perm_addr;
1689                 list_for_each_entry(sdata, &local->interfaces, list) {
1690                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1691                                 continue;
1692                         m = sdata->vif.addr;
1693                         break;
1694                 }
1695                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1696                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1697                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1698
1699                 inc = 1ULL<<__ffs64(mask);
1700                 val = (start & mask);
1701                 addr = (start & ~mask) | (val & mask);
1702                 do {
1703                         bool used = false;
1704
1705                         tmp_addr[5] = addr >> 0*8;
1706                         tmp_addr[4] = addr >> 1*8;
1707                         tmp_addr[3] = addr >> 2*8;
1708                         tmp_addr[2] = addr >> 3*8;
1709                         tmp_addr[1] = addr >> 4*8;
1710                         tmp_addr[0] = addr >> 5*8;
1711
1712                         val += inc;
1713
1714                         list_for_each_entry(sdata, &local->interfaces, list) {
1715                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1716                                         used = true;
1717                                         break;
1718                                 }
1719                         }
1720
1721                         if (!used) {
1722                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1723                                 break;
1724                         }
1725                         addr = (start & ~mask) | (val & mask);
1726                 } while (addr != start);
1727
1728                 break;
1729         }
1730
1731  out_unlock:
1732         mutex_unlock(&local->iflist_mtx);
1733 }
1734
1735 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1736                      unsigned char name_assign_type,
1737                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1738                      struct vif_params *params)
1739 {
1740         struct net_device *ndev = NULL;
1741         struct ieee80211_sub_if_data *sdata = NULL;
1742         struct txq_info *txqi;
1743         void (*if_setup)(struct net_device *dev);
1744         int ret, i;
1745         int txqs = 1;
1746
1747         ASSERT_RTNL();
1748
1749         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1750                 struct wireless_dev *wdev;
1751
1752                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1753                                 GFP_KERNEL);
1754                 if (!sdata)
1755                         return -ENOMEM;
1756                 wdev = &sdata->wdev;
1757
1758                 sdata->dev = NULL;
1759                 strlcpy(sdata->name, name, IFNAMSIZ);
1760                 ieee80211_assign_perm_addr(local, wdev->address, type);
1761                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1762         } else {
1763                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1764                                  sizeof(void *));
1765                 int txq_size = 0;
1766
1767                 if (local->ops->wake_tx_queue)
1768                         txq_size += sizeof(struct txq_info) +
1769                                     local->hw.txq_data_size;
1770
1771                 if (local->ops->wake_tx_queue)
1772                         if_setup = ieee80211_if_setup_no_queue;
1773                 else
1774                         if_setup = ieee80211_if_setup;
1775
1776                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1777                         txqs = IEEE80211_NUM_ACS;
1778
1779                 ndev = alloc_netdev_mqs(size + txq_size,
1780                                         name, name_assign_type,
1781                                         if_setup, txqs, 1);
1782                 if (!ndev)
1783                         return -ENOMEM;
1784                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1785
1786                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1787                 if (!ndev->tstats) {
1788                         free_netdev(ndev);
1789                         return -ENOMEM;
1790                 }
1791
1792                 ndev->needed_headroom = local->tx_headroom +
1793                                         4*6 /* four MAC addresses */
1794                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1795                                         + 6 /* mesh */
1796                                         + 8 /* rfc1042/bridge tunnel */
1797                                         - ETH_HLEN /* ethernet hard_header_len */
1798                                         + IEEE80211_ENCRYPT_HEADROOM;
1799                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1800
1801                 ret = dev_alloc_name(ndev, ndev->name);
1802                 if (ret < 0) {
1803                         ieee80211_if_free(ndev);
1804                         return ret;
1805                 }
1806
1807                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1808                 if (params && is_valid_ether_addr(params->macaddr))
1809                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1810                 else
1811                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1812                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1813
1814                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1815                 sdata = netdev_priv(ndev);
1816                 ndev->ieee80211_ptr = &sdata->wdev;
1817                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1818                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1819
1820                 if (txq_size) {
1821                         txqi = netdev_priv(ndev) + size;
1822                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1823                 }
1824
1825                 sdata->dev = ndev;
1826         }
1827
1828         /* initialise type-independent data */
1829         sdata->wdev.wiphy = local->hw.wiphy;
1830         sdata->local = local;
1831
1832         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1833                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1834
1835         INIT_LIST_HEAD(&sdata->key_list);
1836
1837         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1838                           ieee80211_dfs_cac_timer_work);
1839         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1840                           ieee80211_delayed_tailroom_dec);
1841
1842         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1843                 struct ieee80211_supported_band *sband;
1844                 sband = local->hw.wiphy->bands[i];
1845                 sdata->rc_rateidx_mask[i] =
1846                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1847                 if (sband) {
1848                         __le16 cap;
1849                         u16 *vht_rate_mask;
1850
1851                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1852                                sband->ht_cap.mcs.rx_mask,
1853                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1854
1855                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1856                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1857                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1858                 } else {
1859                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1860                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1861                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1862                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1863                 }
1864         }
1865
1866         ieee80211_set_default_queues(sdata);
1867
1868         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1869         sdata->user_power_level = local->user_power_level;
1870
1871         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1872
1873         /* setup type-dependent data */
1874         ieee80211_setup_sdata(sdata, type);
1875
1876         if (ndev) {
1877                 if (params) {
1878                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1879                         if (type == NL80211_IFTYPE_STATION)
1880                                 sdata->u.mgd.use_4addr = params->use_4addr;
1881                 }
1882
1883                 ndev->features |= local->hw.netdev_features;
1884
1885                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1886
1887                 ret = register_netdevice(ndev);
1888                 if (ret) {
1889                         ieee80211_if_free(ndev);
1890                         return ret;
1891                 }
1892         }
1893
1894         mutex_lock(&local->iflist_mtx);
1895         list_add_tail_rcu(&sdata->list, &local->interfaces);
1896         mutex_unlock(&local->iflist_mtx);
1897
1898         if (new_wdev)
1899                 *new_wdev = &sdata->wdev;
1900
1901         return 0;
1902 }
1903
1904 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1905 {
1906         ASSERT_RTNL();
1907
1908         mutex_lock(&sdata->local->iflist_mtx);
1909         list_del_rcu(&sdata->list);
1910         mutex_unlock(&sdata->local->iflist_mtx);
1911
1912         synchronize_rcu();
1913
1914         if (sdata->dev) {
1915                 unregister_netdevice(sdata->dev);
1916         } else {
1917                 cfg80211_unregister_wdev(&sdata->wdev);
1918                 ieee80211_teardown_sdata(sdata);
1919                 kfree(sdata);
1920         }
1921 }
1922
1923 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1924 {
1925         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1926                 return;
1927         ieee80211_do_stop(sdata, true);
1928 }
1929
1930 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1931 {
1932         struct ieee80211_sub_if_data *sdata, *tmp;
1933         LIST_HEAD(unreg_list);
1934         LIST_HEAD(wdev_list);
1935
1936         ASSERT_RTNL();
1937
1938         /* Before destroying the interfaces, make sure they're all stopped so
1939          * that the hardware is stopped. Otherwise, the driver might still be
1940          * iterating the interfaces during the shutdown, e.g. from a worker
1941          * or from RX processing or similar, and if it does so (using atomic
1942          * iteration) while we're manipulating the list, the iteration will
1943          * crash.
1944          *
1945          * After this, the hardware should be stopped and the driver should
1946          * have stopped all of its activities, so that we can do RCU-unaware
1947          * manipulations of the interface list below.
1948          */
1949         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
1950
1951         WARN(local->open_count, "%s: open count remains %d\n",
1952              wiphy_name(local->hw.wiphy), local->open_count);
1953
1954         mutex_lock(&local->iflist_mtx);
1955         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1956                 list_del(&sdata->list);
1957
1958                 if (sdata->dev)
1959                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1960                 else
1961                         list_add(&sdata->list, &wdev_list);
1962         }
1963         mutex_unlock(&local->iflist_mtx);
1964         unregister_netdevice_many(&unreg_list);
1965
1966         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1967                 list_del(&sdata->list);
1968                 cfg80211_unregister_wdev(&sdata->wdev);
1969                 kfree(sdata);
1970         }
1971 }
1972
1973 static int netdev_notify(struct notifier_block *nb,
1974                          unsigned long state, void *ptr)
1975 {
1976         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1977         struct ieee80211_sub_if_data *sdata;
1978
1979         if (state != NETDEV_CHANGENAME)
1980                 return NOTIFY_DONE;
1981
1982         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1983                 return NOTIFY_DONE;
1984
1985         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1986                 return NOTIFY_DONE;
1987
1988         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1989         memcpy(sdata->name, dev->name, IFNAMSIZ);
1990         ieee80211_debugfs_rename_netdev(sdata);
1991
1992         return NOTIFY_OK;
1993 }
1994
1995 static struct notifier_block mac80211_netdev_notifier = {
1996         .notifier_call = netdev_notify,
1997 };
1998
1999 int ieee80211_iface_init(void)
2000 {
2001         return register_netdevice_notifier(&mac80211_netdev_notifier);
2002 }
2003
2004 void ieee80211_iface_exit(void)
2005 {
2006         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2007 }