net/mac80211/main.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <net/mac80211.h>
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/types.h>
  16 #include <linux/slab.h>
  17 #include <linux/skbuff.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/bitmap.h>
  22 #include <linux/pm_qos.h>
  23 #include <linux/inetdevice.h>
  24 #include <net/net_namespace.h>
  25 #include <net/cfg80211.h>
  26 #include <net/addrconf.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "rate.h"
  31 #include "mesh.h"
  32 #include "wep.h"
  33 #include "led.h"
  34 #include "cfg.h"
  35 #include "debugfs.h"
  36
  37 void ieee80211_configure_filter(struct ieee80211_local *local)
  38 {
  39         u64 mc;
  40         unsigned int changed_flags;
  41         unsigned int new_flags = 0;
  42
  43         if (atomic_read(&local->iff_promiscs))
  44                 new_flags |= FIF_PROMISC_IN_BSS;
  45
  46         if (atomic_read(&local->iff_allmultis))
  47                 new_flags |= FIF_ALLMULTI;
  48
  49         if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning) ||
  50             test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning))
  51                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  52
  53         if (local->fif_probe_req || local->probe_req_reg)
  54                 new_flags |= FIF_PROBE_REQ;
  55
  56         if (local->fif_fcsfail)
  57                 new_flags |= FIF_FCSFAIL;
  58
  59         if (local->fif_plcpfail)
  60                 new_flags |= FIF_PLCPFAIL;
  61
  62         if (local->fif_control)
  63                 new_flags |= FIF_CONTROL;
  64
  65         if (local->fif_other_bss)
  66                 new_flags |= FIF_OTHER_BSS;
  67
  68         if (local->fif_pspoll)
  69                 new_flags |= FIF_PSPOLL;
  70
  71         spin_lock_bh(&local->filter_lock);
  72         changed_flags = local->filter_flags ^ new_flags;
  73
  74         mc = drv_prepare_multicast(local, &local->mc_list);
  75         spin_unlock_bh(&local->filter_lock);
  76
  77         /* be a bit nasty */
  78         new_flags |= (1<<31);
  79
  80         drv_configure_filter(local, changed_flags, &new_flags, mc);
  81
  82         WARN_ON(new_flags & (1<<31));
  83
  84         local->filter_flags = new_flags & ~(1<<31);
  85 }
  86
  87 static void ieee80211_reconfig_filter(struct work_struct *work)
  88 {
  89         struct ieee80211_local *local =
  90                 container_of(work, struct ieee80211_local, reconfig_filter);
  91
  92         ieee80211_configure_filter(local);
  93 }
  94
  95 static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
  96 {
  97         struct ieee80211_sub_if_data *sdata;
  98         struct ieee80211_channel *chan;
  99         u32 changed = 0;
 100         int power;
 101         enum nl80211_channel_type channel_type;
 102         u32 offchannel_flag;
 103         bool scanning = false;
 104
 105         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 106         if (local->scan_channel) {
 107                 chan = local->scan_channel;
 108                 /* If scanning on oper channel, use whatever channel-type
 109                  * is currently in use.
 110                  */
 111                 if (chan == local->_oper_channel)
 112                         channel_type = local->_oper_channel_type;
 113                 else
 114                         channel_type = NL80211_CHAN_NO_HT;
 115         } else if (local->tmp_channel) {
 116                 chan = local->tmp_channel;
 117                 channel_type = NL80211_CHAN_NO_HT;
 118         } else {
 119                 chan = local->_oper_channel;
 120                 channel_type = local->_oper_channel_type;
 121         }
 122
 123         if (chan != local->_oper_channel ||
 124             channel_type != local->_oper_channel_type)
 125                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 126         else
 127                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 128
 129         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 130
 131         if (offchannel_flag || chan != local->hw.conf.channel ||
 132             channel_type != local->hw.conf.channel_type) {
 133                 local->hw.conf.channel = chan;
 134                 local->hw.conf.channel_type = channel_type;
 135                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 136         }
 137
 138         if (!conf_is_ht(&local->hw.conf)) {
 139                 /*
 140                  * mac80211.h documents that this is only valid
 141                  * when the channel is set to an HT type, and
 142                  * that otherwise STATIC is used.
 143                  */
 144                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 145         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 146                 local->hw.conf.smps_mode = local->smps_mode;
 147                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 148         }
 149
 150         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 151                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning) ||
 152                    test_bit(SCAN_HW_SCANNING, &local->scanning);
 153         power = chan->max_power;
 154
 155         rcu_read_lock();
 156         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 157                 if (!rcu_access_pointer(sdata->vif.chanctx_conf))
 158                         continue;
 159                 power = min(power, sdata->vif.bss_conf.txpower);
 160         }
 161         rcu_read_unlock();
 162
 163         if (local->hw.conf.power_level != power) {
 164                 changed |= IEEE80211_CONF_CHANGE_POWER;
 165                 local->hw.conf.power_level = power;
 166         }
 167
 168         return changed;
 169 }
 170
 171 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 172 {
 173         int ret = 0;
 174
 175         might_sleep();
 176
 177         if (!local->use_chanctx)
 178                 changed |= ieee80211_hw_conf_chan(local);
 179         else
 180                 changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL |
 181                              IEEE80211_CONF_CHANGE_POWER);
 182
 183         if (changed && local->open_count) {
 184                 ret = drv_config(local, changed);
 185                 /*
 186                  * Goal:
 187                  * HW reconfiguration should never fail, the driver has told
 188                  * us what it can support so it should live up to that promise.
 189                  *
 190                  * Current status:
 191                  * rfkill is not integrated with mac80211 and a
 192                  * configuration command can thus fail if hardware rfkill
 193                  * is enabled
 194                  *
 195                  * FIXME: integrate rfkill with mac80211 and then add this
 196                  * WARN_ON() back
 197                  *
 198                  */
 199                 /* WARN_ON(ret); */
 200         }
 201
 202         return ret;
 203 }
 204
 205 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 206                                       u32 changed)
 207 {
 208         struct ieee80211_local *local = sdata->local;
 209
 210         if (!changed)
 211                 return;
 212
 213         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 214 }
 215
 216 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 217 {
 218         sdata->vif.bss_conf.use_cts_prot = false;
 219         sdata->vif.bss_conf.use_short_preamble = false;
 220         sdata->vif.bss_conf.use_short_slot = false;
 221         return BSS_CHANGED_ERP_CTS_PROT |
 222                BSS_CHANGED_ERP_PREAMBLE |
 223                BSS_CHANGED_ERP_SLOT;
 224 }
 225
 226 static void ieee80211_tasklet_handler(unsigned long data)
 227 {
 228         struct ieee80211_local *local = (struct ieee80211_local *) data;
 229         struct sta_info *sta, *tmp;
 230         struct skb_eosp_msg_data *eosp_data;
 231         struct sk_buff *skb;
 232
 233         while ((skb = skb_dequeue(&local->skb_queue)) ||
 234                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 235                 switch (skb->pkt_type) {
 236                 case IEEE80211_RX_MSG:
 237                         /* Clear skb->pkt_type in order to not confuse kernel
 238                          * netstack. */
 239                         skb->pkt_type = 0;
 240                         ieee80211_rx(&local->hw, skb);
 241                         break;
 242                 case IEEE80211_TX_STATUS_MSG:
 243                         skb->pkt_type = 0;
 244                         ieee80211_tx_status(&local->hw, skb);
 245                         break;
 246                 case IEEE80211_EOSP_MSG:
 247                         eosp_data = (void *)skb->cb;
 248                         for_each_sta_info(local, eosp_data->sta, sta, tmp) {
 249                                 /* skip wrong virtual interface */
 250                                 if (memcmp(eosp_data->iface,
 251                                            sta->sdata->vif.addr, ETH_ALEN))
 252                                         continue;
 253                                 clear_sta_flag(sta, WLAN_STA_SP);
 254                                 break;
 255                         }
 256                         dev_kfree_skb(skb);
 257                         break;
 258                 default:
 259                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 260                              skb->pkt_type);
 261                         dev_kfree_skb(skb);
 262                         break;
 263                 }
 264         }
 265 }
 266
 267 static void ieee80211_restart_work(struct work_struct *work)
 268 {
 269         struct ieee80211_local *local =
 270                 container_of(work, struct ieee80211_local, restart_work);
 271
 272         /* wait for scan work complete */
 273         flush_workqueue(local->workqueue);
 274
 275         mutex_lock(&local->mtx);
 276         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
 277              rcu_dereference_protected(local->sched_scan_sdata,
 278                                        lockdep_is_held(&local->mtx)),
 279                 "%s called with hardware scan in progress\n", __func__);
 280         mutex_unlock(&local->mtx);
 281
 282         rtnl_lock();
 283         ieee80211_scan_cancel(local);
 284         ieee80211_reconfig(local);
 285         rtnl_unlock();
 286 }
 287
 288 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 289 {
 290         struct ieee80211_local *local = hw_to_local(hw);
 291
 292         trace_api_restart_hw(local);
 293
 294         wiphy_info(hw->wiphy,
 295                    "Hardware restart was requested\n");
 296
 297         /* use this reason, ieee80211_reconfig will unblock it */
 298         ieee80211_stop_queues_by_reason(hw,
 299                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 300
 301         /*
 302          * Stop all Rx during the reconfig. We don't want state changes
 303          * or driver callbacks while this is in progress.
 304          */
 305         local->in_reconfig = true;
 306         barrier();
 307
 308         schedule_work(&local->restart_work);
 309 }
 310 EXPORT_SYMBOL(ieee80211_restart_hw);
 311
 312 #ifdef CONFIG_INET
 313 static int ieee80211_ifa_changed(struct notifier_block *nb,
 314                                  unsigned long data, void *arg)
 315 {
 316         struct in_ifaddr *ifa = arg;
 317         struct ieee80211_local *local =
 318                 container_of(nb, struct ieee80211_local,
 319                              ifa_notifier);
 320         struct net_device *ndev = ifa->ifa_dev->dev;
 321         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 322         struct in_device *idev;
 323         struct ieee80211_sub_if_data *sdata;
 324         struct ieee80211_bss_conf *bss_conf;
 325         struct ieee80211_if_managed *ifmgd;
 326         int c = 0;
 327
 328         /* Make sure it's our interface that got changed */
 329         if (!wdev)
 330                 return NOTIFY_DONE;
 331
 332         if (wdev->wiphy != local->hw.wiphy)
 333                 return NOTIFY_DONE;
 334
 335         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 336         bss_conf = &sdata->vif.bss_conf;
 337
 338         /* ARP filtering is only supported in managed mode */
 339         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 340                 return NOTIFY_DONE;
 341
 342         idev = __in_dev_get_rtnl(sdata->dev);
 343         if (!idev)
 344                 return NOTIFY_DONE;
 345
 346         ifmgd = &sdata->u.mgd;
 347         mutex_lock(&ifmgd->mtx);
 348
 349         /* Copy the addresses to the bss_conf list */
 350         ifa = idev->ifa_list;
 351         while (ifa) {
 352                 if (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN)
 353                         bss_conf->arp_addr_list[c] = ifa->ifa_address;
 354                 ifa = ifa->ifa_next;
 355                 c++;
 356         }
 357
 358         bss_conf->arp_addr_cnt = c;
 359
 360         /* Configure driver only if associated (which also implies it is up) */
 361         if (ifmgd->associated)
 362                 ieee80211_bss_info_change_notify(sdata,
 363                                                  BSS_CHANGED_ARP_FILTER);
 364
 365         mutex_unlock(&ifmgd->mtx);
 366
 367         return NOTIFY_DONE;
 368 }
 369 #endif
 370
 371 #if IS_ENABLED(CONFIG_IPV6)
 372 static int ieee80211_ifa6_changed(struct notifier_block *nb,
 373                                   unsigned long data, void *arg)
 374 {
 375         struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)arg;
 376         struct inet6_dev *idev = ifa->idev;
 377         struct net_device *ndev = ifa->idev->dev;
 378         struct ieee80211_local *local =
 379                 container_of(nb, struct ieee80211_local, ifa6_notifier);
 380         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 381         struct ieee80211_sub_if_data *sdata;
 382
 383         /* Make sure it's our interface that got changed */
 384         if (!wdev || wdev->wiphy != local->hw.wiphy)
 385                 return NOTIFY_DONE;
 386
 387         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 388
 389         /*
 390          * For now only support station mode. This is mostly because
 391          * doing AP would have to handle AP_VLAN in some way ...
 392          */
 393         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 394                 return NOTIFY_DONE;
 395
 396         drv_ipv6_addr_change(local, sdata, idev);
 397
 398         return NOTIFY_DONE;
 399 }
 400 #endif
 401
 402 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
 403 {
 404         struct ieee80211_local *local =
 405                 container_of(napi, struct ieee80211_local, napi);
 406
 407         return local->ops->napi_poll(&local->hw, budget);
 408 }
 409
 410 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
 411 {
 412         struct ieee80211_local *local = hw_to_local(hw);
 413
 414         napi_schedule(&local->napi);
 415 }
 416 EXPORT_SYMBOL(ieee80211_napi_schedule);
 417
 418 void ieee80211_napi_complete(struct ieee80211_hw *hw)
 419 {
 420         struct ieee80211_local *local = hw_to_local(hw);
 421
 422         napi_complete(&local->napi);
 423 }
 424 EXPORT_SYMBOL(ieee80211_napi_complete);
 425
 426 /* There isn't a lot of sense in it, but you can transmit anything you like */
 427 static const struct ieee80211_txrx_stypes
 428 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 429         [NL80211_IFTYPE_ADHOC] = {
 430                 .tx = 0xffff,
 431                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 432                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 433                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 434                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 435         },
 436         [NL80211_IFTYPE_STATION] = {
 437                 .tx = 0xffff,
 438                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 439                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 440         },
 441         [NL80211_IFTYPE_AP] = {
 442                 .tx = 0xffff,
 443                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 444                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 445                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 446                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 447                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 448                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 449                         BIT(IEEE80211_STYPE_ACTION >> 4),
 450         },
 451         [NL80211_IFTYPE_AP_VLAN] = {
 452                 /* copy AP */
 453                 .tx = 0xffff,
 454                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 455                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 456                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 457                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 458                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 459                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 460                         BIT(IEEE80211_STYPE_ACTION >> 4),
 461         },
 462         [NL80211_IFTYPE_P2P_CLIENT] = {
 463                 .tx = 0xffff,
 464                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 465                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 466         },
 467         [NL80211_IFTYPE_P2P_GO] = {
 468                 .tx = 0xffff,
 469                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 470                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 471                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 472                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 473                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 474                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 475                         BIT(IEEE80211_STYPE_ACTION >> 4),
 476         },
 477         [NL80211_IFTYPE_MESH_POINT] = {
 478                 .tx = 0xffff,
 479                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 480                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 481                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 482         },
 483         [NL80211_IFTYPE_P2P_DEVICE] = {
 484                 .tx = 0xffff,
 485                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 486                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 487         },
 488 };
 489
 490 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
 491         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
 492                              IEEE80211_HT_AMPDU_PARM_DENSITY,
 493
 494         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 495                                 IEEE80211_HT_CAP_MAX_AMSDU |
 496                                 IEEE80211_HT_CAP_SGI_20 |
 497                                 IEEE80211_HT_CAP_SGI_40),
 498         .mcs = {
 499                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
 500                              0xff, 0xff, 0xff, 0xff, 0xff, },
 501         },
 502 };
 503
 504 static const u8 extended_capabilities[] = {
 505         0, 0, 0, 0, 0, 0, 0,
 506         WLAN_EXT_CAPA8_OPMODE_NOTIF,
 507 };
 508
 509 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 510                                         const struct ieee80211_ops *ops)
 511 {
 512         struct ieee80211_local *local;
 513         int priv_size, i;
 514         struct wiphy *wiphy;
 515         bool use_chanctx;
 516
 517         if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
 518                     !ops->add_interface || !ops->remove_interface ||
 519                     !ops->configure_filter))
 520                 return NULL;
 521
 522         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
 523                 return NULL;
 524
 525         /* check all or no channel context operations exist */
 526         i = !!ops->add_chanctx + !!ops->remove_chanctx +
 527             !!ops->change_chanctx + !!ops->assign_vif_chanctx +
 528             !!ops->unassign_vif_chanctx;
 529         if (WARN_ON(i != 0 && i != 5))
 530                 return NULL;
 531         use_chanctx = i == 5;
 532
 533         /* Ensure 32-byte alignment of our private data and hw private data.
 534          * We use the wiphy priv data for both our ieee80211_local and for
 535          * the driver's private data
 536          *
 537          * In memory it'll be like this:
 538          *
 539          * +-------------------------+
 540          * | struct wiphy           |
 541          * +-------------------------+
 542          * | struct ieee80211_local  |
 543          * +-------------------------+
 544          * | driver's private data   |
 545          * +-------------------------+
 546          *
 547          */
 548         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 549
 550         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 551
 552         if (!wiphy)
 553                 return NULL;
 554
 555         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 556
 557         wiphy->privid = mac80211_wiphy_privid;
 558
 559         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 560                         WIPHY_FLAG_4ADDR_AP |
 561                         WIPHY_FLAG_4ADDR_STATION |
 562                         WIPHY_FLAG_REPORTS_OBSS |
 563                         WIPHY_FLAG_OFFCHAN_TX;
 564
 565         wiphy->extended_capabilities = extended_capabilities;
 566         wiphy->extended_capabilities_mask = extended_capabilities;
 567         wiphy->extended_capabilities_len = ARRAY_SIZE(extended_capabilities);
 568
 569         if (ops->remain_on_channel)
 570                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 571
 572         wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
 573                            NL80211_FEATURE_SAE |
 574                            NL80211_FEATURE_HT_IBSS |
 575                            NL80211_FEATURE_VIF_TXPOWER;
 576
 577         if (!ops->hw_scan)
 578                 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
 579                                    NL80211_FEATURE_AP_SCAN;
 580
 581
 582         if (!ops->set_key)
 583                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 584
 585         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 586
 587         local = wiphy_priv(wiphy);
 588
 589         local->hw.wiphy = wiphy;
 590
 591         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 592
 593         local->ops = ops;
 594         local->use_chanctx = use_chanctx;
 595
 596         /* set up some defaults */
 597         local->hw.queues = 1;
 598         local->hw.max_rates = 1;
 599         local->hw.max_report_rates = 0;
 600         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 601         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 602         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
 603         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 604         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 605         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 606                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 607                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 608         local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 609                                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 610         local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
 611         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
 612
 613         INIT_LIST_HEAD(&local->interfaces);
 614
 615         __hw_addr_init(&local->mc_list);
 616
 617         mutex_init(&local->iflist_mtx);
 618         mutex_init(&local->mtx);
 619
 620         mutex_init(&local->key_mtx);
 621         spin_lock_init(&local->filter_lock);
 622         spin_lock_init(&local->rx_path_lock);
 623         spin_lock_init(&local->queue_stop_reason_lock);
 624
 625         INIT_LIST_HEAD(&local->chanctx_list);
 626         mutex_init(&local->chanctx_mtx);
 627
 628         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 629
 630         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 631
 632         INIT_WORK(&local->radar_detected_work,
 633                   ieee80211_dfs_radar_detected_work);
 634
 635         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 636         local->smps_mode = IEEE80211_SMPS_OFF;
 637
 638         INIT_WORK(&local->dynamic_ps_enable_work,
 639                   ieee80211_dynamic_ps_enable_work);
 640         INIT_WORK(&local->dynamic_ps_disable_work,
 641                   ieee80211_dynamic_ps_disable_work);
 642         setup_timer(&local->dynamic_ps_timer,
 643                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 644
 645         INIT_WORK(&local->sched_scan_stopped_work,
 646                   ieee80211_sched_scan_stopped_work);
 647
 648         spin_lock_init(&local->ack_status_lock);
 649         idr_init(&local->ack_status_frames);
 650         /* preallocate at least one entry */
 651         idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
 652
 653         sta_info_init(local);
 654
 655         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 656                 skb_queue_head_init(&local->pending[i]);
 657                 atomic_set(&local->agg_queue_stop[i], 0);
 658         }
 659         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 660                      (unsigned long)local);
 661
 662         tasklet_init(&local->tasklet,
 663                      ieee80211_tasklet_handler,
 664                      (unsigned long) local);
 665
 666         skb_queue_head_init(&local->skb_queue);
 667         skb_queue_head_init(&local->skb_queue_unreliable);
 668
 669         /* init dummy netdev for use w/ NAPI */
 670         init_dummy_netdev(&local->napi_dev);
 671
 672         ieee80211_led_names(local);
 673
 674         ieee80211_roc_setup(local);
 675
 676         return &local->hw;
 677 }
 678 EXPORT_SYMBOL(ieee80211_alloc_hw);
 679
 680 int ieee80211_register_hw(struct ieee80211_hw *hw)
 681 {
 682         struct ieee80211_local *local = hw_to_local(hw);
 683         int result, i;
 684         enum ieee80211_band band;
 685         int channels, max_bitrates;
 686         bool supp_ht, supp_vht;
 687         netdev_features_t feature_whitelist;
 688         static const u32 cipher_suites[] = {
 689                 /* keep WEP first, it may be removed below */
 690                 WLAN_CIPHER_SUITE_WEP40,
 691                 WLAN_CIPHER_SUITE_WEP104,
 692                 WLAN_CIPHER_SUITE_TKIP,
 693                 WLAN_CIPHER_SUITE_CCMP,
 694
 695                 /* keep last -- depends on hw flags! */
 696                 WLAN_CIPHER_SUITE_AES_CMAC
 697         };
 698
 699         if (hw->flags & IEEE80211_HW_QUEUE_CONTROL &&
 700             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
 701              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
 702                 return -EINVAL;
 703
 704 #ifdef CONFIG_PM
 705         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) &&
 706             (!local->ops->suspend || !local->ops->resume))
 707                 return -EINVAL;
 708 #endif
 709
 710         if (!local->use_chanctx) {
 711                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 712                         const struct ieee80211_iface_combination *comb;
 713
 714                         comb = &local->hw.wiphy->iface_combinations[i];
 715
 716                         if (comb->num_different_channels > 1)
 717                                 return -EINVAL;
 718                 }
 719         } else {
 720                 /*
 721                  * WDS is currently prohibited when channel contexts are used
 722                  * because there's no clear definition of which channel WDS
 723                  * type interfaces use
 724                  */
 725                 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))
 726                         return -EINVAL;
 727
 728                 /* DFS currently not supported with channel context drivers */
 729                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 730                         const struct ieee80211_iface_combination *comb;
 731
 732                         comb = &local->hw.wiphy->iface_combinations[i];
 733
 734                         if (comb->radar_detect_widths)
 735                                 return -EINVAL;
 736                 }
 737         }
 738
 739         /* Only HW csum features are currently compatible with mac80211 */
 740         feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 741                             NETIF_F_HW_CSUM;
 742         if (WARN_ON(hw->netdev_features & ~feature_whitelist))
 743                 return -EINVAL;
 744
 745         if (hw->max_report_rates == 0)
 746                 hw->max_report_rates = hw->max_rates;
 747
 748         local->rx_chains = 1;
 749
 750         /*
 751          * generic code guarantees at least one band,
 752          * set this very early because much code assumes
 753          * that hw.conf.channel is assigned
 754          */
 755         channels = 0;
 756         max_bitrates = 0;
 757         supp_ht = false;
 758         supp_vht = false;
 759         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 760                 struct ieee80211_supported_band *sband;
 761
 762                 sband = local->hw.wiphy->bands[band];
 763                 if (!sband)
 764                         continue;
 765                 if (!local->use_chanctx && !local->_oper_channel) {
 766                         /* init channel we're on */
 767                         local->hw.conf.channel =
 768                         local->_oper_channel = &sband->channels[0];
 769                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 770                 }
 771                 cfg80211_chandef_create(&local->monitor_chandef,
 772                                         &sband->channels[0],
 773                                         NL80211_CHAN_NO_HT);
 774                 channels += sband->n_channels;
 775
 776                 if (max_bitrates < sband->n_bitrates)
 777                         max_bitrates = sband->n_bitrates;
 778                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 779                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
 780
 781                 if (sband->ht_cap.ht_supported)
 782                         local->rx_chains =
 783                                 max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
 784                                     local->rx_chains);
 785
 786                 /* TODO: consider VHT for RX chains, hopefully it's the same */
 787         }
 788
 789         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 790                                       sizeof(void *) * channels, GFP_KERNEL);
 791         if (!local->int_scan_req)
 792                 return -ENOMEM;
 793
 794         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 795                 if (!local->hw.wiphy->bands[band])
 796                         continue;
 797                 local->int_scan_req->rates[band] = (u32) -1;
 798         }
 799
 800         /* if low-level driver supports AP, we also support VLAN */
 801         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
 802                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 803                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 804         }
 805
 806         /* mac80211 always supports monitor */
 807         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 808         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 809
 810         /* mac80211 doesn't support more than one IBSS interface right now */
 811         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 812                 const struct ieee80211_iface_combination *c;
 813                 int j;
 814
 815                 c = &hw->wiphy->iface_combinations[i];
 816
 817                 for (j = 0; j < c->n_limits; j++)
 818                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 819                             c->limits[j].max > 1)
 820                                 return -EINVAL;
 821         }
 822
 823 #ifndef CONFIG_MAC80211_MESH
 824         /* mesh depends on Kconfig, but drivers should set it if they want */
 825         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 826 #endif
 827
 828         /* if the underlying driver supports mesh, mac80211 will (at least)
 829          * provide routing of mesh authentication frames to userspace */
 830         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 831                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 832
 833         /* mac80211 supports control port protocol changing */
 834         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 835
 836         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 837                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 838         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 839                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 840
 841         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 842              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 843              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 844
 845         /*
 846          * Calculate scan IE length -- we need this to alloc
 847          * memory and to subtract from the driver limit. It
 848          * includes the DS Params, (extended) supported rates, and HT
 849          * information -- SSID is the driver's responsibility.
 850          */
 851         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 852                 3 /* DS Params */;
 853         if (supp_ht)
 854                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 855
 856         if (supp_vht) {
 857                 local->scan_ies_len +=
 858                         2 + sizeof(struct ieee80211_vht_cap);
 859
 860                 /*
 861                  * (for now at least), drivers wanting to use VHT must
 862                  * support channel contexts, as they contain all the
 863                  * necessary VHT information and the global hw config
 864                  * doesn't (yet)
 865                  */
 866                 if (WARN_ON(!local->use_chanctx)) {
 867                         result = -EINVAL;
 868                         goto fail_wiphy_register;
 869                 }
 870         }
 871
 872         if (!local->ops->hw_scan) {
 873                 /* For hw_scan, driver needs to set these up. */
 874                 local->hw.wiphy->max_scan_ssids = 4;
 875                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 876         }
 877
 878         /*
 879          * If the driver supports any scan IEs, then assume the
 880          * limit includes the IEs mac80211 will add, otherwise
 881          * leave it at zero and let the driver sort it out; we
 882          * still pass our IEs to the driver but userspace will
 883          * not be allowed to in that case.
 884          */
 885         if (local->hw.wiphy->max_scan_ie_len)
 886                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 887
 888         /* Set up cipher suites unless driver already did */
 889         if (!local->hw.wiphy->cipher_suites) {
 890                 local->hw.wiphy->cipher_suites = cipher_suites;
 891                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 892                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 893                         local->hw.wiphy->n_cipher_suites--;
 894         }
 895         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 896                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 897                         local->hw.wiphy->cipher_suites += 2;
 898                         local->hw.wiphy->n_cipher_suites -= 2;
 899                 } else {
 900                         u32 *suites;
 901                         int r, w = 0;
 902
 903                         /* Filter out WEP */
 904
 905                         suites = kmemdup(
 906                                 local->hw.wiphy->cipher_suites,
 907                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 908                                 GFP_KERNEL);
 909                         if (!suites) {
 910                                 result = -ENOMEM;
 911                                 goto fail_wiphy_register;
 912                         }
 913                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 914                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 915                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 916                                     suite == WLAN_CIPHER_SUITE_WEP104)
 917                                         continue;
 918                                 suites[w++] = suite;
 919                         }
 920                         local->hw.wiphy->cipher_suites = suites;
 921                         local->hw.wiphy->n_cipher_suites = w;
 922                         local->wiphy_ciphers_allocated = true;
 923                 }
 924         }
 925
 926         if (!local->ops->remain_on_channel)
 927                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
 928
 929         if (local->ops->sched_scan_start)
 930                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
 931
 932         /* mac80211 based drivers don't support internal TDLS setup */
 933         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
 934                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
 935
 936         result = wiphy_register(local->hw.wiphy);
 937         if (result < 0)
 938                 goto fail_wiphy_register;
 939
 940         /*
 941          * We use the number of queues for feature tests (QoS, HT) internally
 942          * so restrict them appropriately.
 943          */
 944         if (hw->queues > IEEE80211_MAX_QUEUES)
 945                 hw->queues = IEEE80211_MAX_QUEUES;
 946
 947         local->workqueue =
 948                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
 949         if (!local->workqueue) {
 950                 result = -ENOMEM;
 951                 goto fail_workqueue;
 952         }
 953
 954         /*
 955          * The hardware needs headroom for sending the frame,
 956          * and we need some headroom for passing the frame to monitor
 957          * interfaces, but never both at the same time.
 958          */
 959         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 960                                    IEEE80211_TX_STATUS_HEADROOM);
 961
 962         debugfs_hw_add(local);
 963
 964         /*
 965          * if the driver doesn't specify a max listen interval we
 966          * use 5 which should be a safe default
 967          */
 968         if (local->hw.max_listen_interval == 0)
 969                 local->hw.max_listen_interval = 5;
 970
 971         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 972
 973         local->dynamic_ps_forced_timeout = -1;
 974
 975         result = ieee80211_wep_init(local);
 976         if (result < 0)
 977                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 978                             result);
 979
 980         ieee80211_led_init(local);
 981
 982         rtnl_lock();
 983
 984         result = ieee80211_init_rate_ctrl_alg(local,
 985                                               hw->rate_control_algorithm);
 986         if (result < 0) {
 987                 wiphy_debug(local->hw.wiphy,
 988                             "Failed to initialize rate control algorithm\n");
 989                 goto fail_rate;
 990         }
 991
 992         /* add one default STA interface if supported */
 993         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 994                 result = ieee80211_if_add(local, "wlan%d", NULL,
 995                                           NL80211_IFTYPE_STATION, NULL);
 996                 if (result)
 997                         wiphy_warn(local->hw.wiphy,
 998                                    "Failed to add default virtual iface\n");
 999         }
1000
1001         rtnl_unlock();
1002
1003         local->network_latency_notifier.notifier_call =
1004                 ieee80211_max_network_latency;
1005         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
1006                                      &local->network_latency_notifier);
1007         if (result) {
1008                 rtnl_lock();
1009                 goto fail_pm_qos;
1010         }
1011
1012 #ifdef CONFIG_INET
1013         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
1014         result = register_inetaddr_notifier(&local->ifa_notifier);
1015         if (result)
1016                 goto fail_ifa;
1017 #endif
1018
1019 #if IS_ENABLED(CONFIG_IPV6)
1020         local->ifa6_notifier.notifier_call = ieee80211_ifa6_changed;
1021         result = register_inet6addr_notifier(&local->ifa6_notifier);
1022         if (result)
1023                 goto fail_ifa6;
1024 #endif
1025
1026         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
1027                         local->hw.napi_weight);
1028
1029         return 0;
1030
1031 #if IS_ENABLED(CONFIG_IPV6)
1032  fail_ifa6:
1033 #ifdef CONFIG_INET
1034         unregister_inetaddr_notifier(&local->ifa_notifier);
1035 #endif
1036 #endif
1037 #if defined(CONFIG_INET) || defined(CONFIG_IPV6)
1038  fail_ifa:
1039         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1040                                &local->network_latency_notifier);
1041         rtnl_lock();
1042 #endif
1043  fail_pm_qos:
1044         ieee80211_led_exit(local);
1045         ieee80211_remove_interfaces(local);
1046  fail_rate:
1047         rtnl_unlock();
1048         ieee80211_wep_free(local);
1049         sta_info_stop(local);
1050         destroy_workqueue(local->workqueue);
1051  fail_workqueue:
1052         wiphy_unregister(local->hw.wiphy);
1053  fail_wiphy_register:
1054         if (local->wiphy_ciphers_allocated)
1055                 kfree(local->hw.wiphy->cipher_suites);
1056         kfree(local->int_scan_req);
1057         return result;
1058 }
1059 EXPORT_SYMBOL(ieee80211_register_hw);
1060
1061 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1062 {
1063         struct ieee80211_local *local = hw_to_local(hw);
1064
1065         tasklet_kill(&local->tx_pending_tasklet);
1066         tasklet_kill(&local->tasklet);
1067
1068         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1069                                &local->network_latency_notifier);
1070 #ifdef CONFIG_INET
1071         unregister_inetaddr_notifier(&local->ifa_notifier);
1072 #endif
1073 #if IS_ENABLED(CONFIG_IPV6)
1074         unregister_inet6addr_notifier(&local->ifa6_notifier);
1075 #endif
1076
1077         rtnl_lock();
1078
1079         /*
1080          * At this point, interface list manipulations are fine
1081          * because the driver cannot be handing us frames any
1082          * more and the tasklet is killed.
1083          */
1084         ieee80211_remove_interfaces(local);
1085
1086         rtnl_unlock();
1087
1088         cancel_work_sync(&local->restart_work);
1089         cancel_work_sync(&local->reconfig_filter);
1090
1091         ieee80211_clear_tx_pending(local);
1092         rate_control_deinitialize(local);
1093
1094         if (skb_queue_len(&local->skb_queue) ||
1095             skb_queue_len(&local->skb_queue_unreliable))
1096                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1097         skb_queue_purge(&local->skb_queue);
1098         skb_queue_purge(&local->skb_queue_unreliable);
1099
1100         destroy_workqueue(local->workqueue);
1101         wiphy_unregister(local->hw.wiphy);
1102         sta_info_stop(local);
1103         ieee80211_wep_free(local);
1104         ieee80211_led_exit(local);
1105         kfree(local->int_scan_req);
1106 }
1107 EXPORT_SYMBOL(ieee80211_unregister_hw);
1108
1109 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1110 {
1111         WARN_ONCE(1, "Have pending ack frames!\n");
1112         kfree_skb(p);
1113         return 0;
1114 }
1115
1116 void ieee80211_free_hw(struct ieee80211_hw *hw)
1117 {
1118         struct ieee80211_local *local = hw_to_local(hw);
1119
1120         mutex_destroy(&local->iflist_mtx);
1121         mutex_destroy(&local->mtx);
1122
1123         if (local->wiphy_ciphers_allocated)
1124                 kfree(local->hw.wiphy->cipher_suites);
1125
1126         idr_for_each(&local->ack_status_frames,
1127                      ieee80211_free_ack_frame, NULL);
1128         idr_destroy(&local->ack_status_frames);
1129
1130         wiphy_free(local->hw.wiphy);
1131 }
1132 EXPORT_SYMBOL(ieee80211_free_hw);
1133
1134 static int __init ieee80211_init(void)
1135 {
1136         struct sk_buff *skb;
1137         int ret;
1138
1139         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1140         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1141                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1142
1143         ret = rc80211_minstrel_init();
1144         if (ret)
1145                 return ret;
1146
1147         ret = rc80211_minstrel_ht_init();
1148         if (ret)
1149                 goto err_minstrel;
1150
1151         ret = rc80211_pid_init();
1152         if (ret)
1153                 goto err_pid;
1154
1155         ret = ieee80211_iface_init();
1156         if (ret)
1157                 goto err_netdev;
1158
1159         return 0;
1160  err_netdev:
1161         rc80211_pid_exit();
1162  err_pid:
1163         rc80211_minstrel_ht_exit();
1164  err_minstrel:
1165         rc80211_minstrel_exit();
1166
1167         return ret;
1168 }
1169
1170 static void __exit ieee80211_exit(void)
1171 {
1172         rc80211_pid_exit();
1173         rc80211_minstrel_ht_exit();
1174         rc80211_minstrel_exit();
1175
1176         ieee80211s_stop();
1177
1178         ieee80211_iface_exit();
1179
1180         rcu_barrier();
1181 }
1182
1183
1184 subsys_initcall(ieee80211_init);
1185 module_exit(ieee80211_exit);
1186
1187 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1188 MODULE_LICENSE("GPL");