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
 104         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 105         if (local->scan_channel) {
 106                 chan = local->scan_channel;
 107                 /* If scanning on oper channel, use whatever channel-type
 108                  * is currently in use.
 109                  */
 110                 if (chan == local->_oper_channel)
 111                         channel_type = local->_oper_channel_type;
 112                 else
 113                         channel_type = NL80211_CHAN_NO_HT;
 114         } else if (local->tmp_channel) {
 115                 chan = local->tmp_channel;
 116                 channel_type = NL80211_CHAN_NO_HT;
 117         } else {
 118                 chan = local->_oper_channel;
 119                 channel_type = local->_oper_channel_type;
 120         }
 121
 122         if (chan != local->_oper_channel ||
 123             channel_type != local->_oper_channel_type)
 124                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 125         else
 126                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 127
 128         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 129
 130         if (offchannel_flag || chan != local->hw.conf.channel ||
 131             channel_type != local->hw.conf.channel_type) {
 132                 local->hw.conf.channel = chan;
 133                 local->hw.conf.channel_type = channel_type;
 134                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 135         }
 136
 137         if (!conf_is_ht(&local->hw.conf)) {
 138                 /*
 139                  * mac80211.h documents that this is only valid
 140                  * when the channel is set to an HT type, and
 141                  * that otherwise STATIC is used.
 142                  */
 143                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 144         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 145                 local->hw.conf.smps_mode = local->smps_mode;
 146                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 147         }
 148
 149         power = chan->max_power;
 150
 151         rcu_read_lock();
 152         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 153                 if (!rcu_access_pointer(sdata->vif.chanctx_conf))
 154                         continue;
 155                 power = min(power, sdata->vif.bss_conf.txpower);
 156         }
 157         rcu_read_unlock();
 158
 159         if (local->hw.conf.power_level != power) {
 160                 changed |= IEEE80211_CONF_CHANGE_POWER;
 161                 local->hw.conf.power_level = power;
 162         }
 163
 164         return changed;
 165 }
 166
 167 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 168 {
 169         int ret = 0;
 170
 171         might_sleep();
 172
 173         if (!local->use_chanctx)
 174                 changed |= ieee80211_hw_conf_chan(local);
 175         else
 176                 changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL |
 177                              IEEE80211_CONF_CHANGE_POWER);
 178
 179         if (changed && local->open_count) {
 180                 ret = drv_config(local, changed);
 181                 /*
 182                  * Goal:
 183                  * HW reconfiguration should never fail, the driver has told
 184                  * us what it can support so it should live up to that promise.
 185                  *
 186                  * Current status:
 187                  * rfkill is not integrated with mac80211 and a
 188                  * configuration command can thus fail if hardware rfkill
 189                  * is enabled
 190                  *
 191                  * FIXME: integrate rfkill with mac80211 and then add this
 192                  * WARN_ON() back
 193                  *
 194                  */
 195                 /* WARN_ON(ret); */
 196         }
 197
 198         return ret;
 199 }
 200
 201 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 202                                       u32 changed)
 203 {
 204         struct ieee80211_local *local = sdata->local;
 205
 206         if (!changed)
 207                 return;
 208
 209         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 210 }
 211
 212 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 213 {
 214         sdata->vif.bss_conf.use_cts_prot = false;
 215         sdata->vif.bss_conf.use_short_preamble = false;
 216         sdata->vif.bss_conf.use_short_slot = false;
 217         return BSS_CHANGED_ERP_CTS_PROT |
 218                BSS_CHANGED_ERP_PREAMBLE |
 219                BSS_CHANGED_ERP_SLOT;
 220 }
 221
 222 static void ieee80211_tasklet_handler(unsigned long data)
 223 {
 224         struct ieee80211_local *local = (struct ieee80211_local *) data;
 225         struct sk_buff *skb;
 226
 227         while ((skb = skb_dequeue(&local->skb_queue)) ||
 228                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 229                 switch (skb->pkt_type) {
 230                 case IEEE80211_RX_MSG:
 231                         /* Clear skb->pkt_type in order to not confuse kernel
 232                          * netstack. */
 233                         skb->pkt_type = 0;
 234                         ieee80211_rx(&local->hw, skb);
 235                         break;
 236                 case IEEE80211_TX_STATUS_MSG:
 237                         skb->pkt_type = 0;
 238                         ieee80211_tx_status(&local->hw, skb);
 239                         break;
 240                 default:
 241                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 242                              skb->pkt_type);
 243                         dev_kfree_skb(skb);
 244                         break;
 245                 }
 246         }
 247 }
 248
 249 static void ieee80211_restart_work(struct work_struct *work)
 250 {
 251         struct ieee80211_local *local =
 252                 container_of(work, struct ieee80211_local, restart_work);
 253
 254         /* wait for scan work complete */
 255         flush_workqueue(local->workqueue);
 256
 257         mutex_lock(&local->mtx);
 258         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
 259              rcu_dereference_protected(local->sched_scan_sdata,
 260                                        lockdep_is_held(&local->mtx)),
 261                 "%s called with hardware scan in progress\n", __func__);
 262         mutex_unlock(&local->mtx);
 263
 264         rtnl_lock();
 265         ieee80211_scan_cancel(local);
 266         ieee80211_reconfig(local);
 267         rtnl_unlock();
 268 }
 269
 270 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 271 {
 272         struct ieee80211_local *local = hw_to_local(hw);
 273
 274         trace_api_restart_hw(local);
 275
 276         wiphy_info(hw->wiphy,
 277                    "Hardware restart was requested\n");
 278
 279         /* use this reason, ieee80211_reconfig will unblock it */
 280         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 281                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 282
 283         /*
 284          * Stop all Rx during the reconfig. We don't want state changes
 285          * or driver callbacks while this is in progress.
 286          */
 287         local->in_reconfig = true;
 288         barrier();
 289
 290         schedule_work(&local->restart_work);
 291 }
 292 EXPORT_SYMBOL(ieee80211_restart_hw);
 293
 294 #ifdef CONFIG_INET
 295 static int ieee80211_ifa_changed(struct notifier_block *nb,
 296                                  unsigned long data, void *arg)
 297 {
 298         struct in_ifaddr *ifa = arg;
 299         struct ieee80211_local *local =
 300                 container_of(nb, struct ieee80211_local,
 301                              ifa_notifier);
 302         struct net_device *ndev = ifa->ifa_dev->dev;
 303         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 304         struct in_device *idev;
 305         struct ieee80211_sub_if_data *sdata;
 306         struct ieee80211_bss_conf *bss_conf;
 307         struct ieee80211_if_managed *ifmgd;
 308         int c = 0;
 309
 310         /* Make sure it's our interface that got changed */
 311         if (!wdev)
 312                 return NOTIFY_DONE;
 313
 314         if (wdev->wiphy != local->hw.wiphy)
 315                 return NOTIFY_DONE;
 316
 317         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 318         bss_conf = &sdata->vif.bss_conf;
 319
 320         /* ARP filtering is only supported in managed mode */
 321         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 322                 return NOTIFY_DONE;
 323
 324         idev = __in_dev_get_rtnl(sdata->dev);
 325         if (!idev)
 326                 return NOTIFY_DONE;
 327
 328         ifmgd = &sdata->u.mgd;
 329         mutex_lock(&ifmgd->mtx);
 330
 331         /* Copy the addresses to the bss_conf list */
 332         ifa = idev->ifa_list;
 333         while (ifa) {
 334                 if (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN)
 335                         bss_conf->arp_addr_list[c] = ifa->ifa_address;
 336                 ifa = ifa->ifa_next;
 337                 c++;
 338         }
 339
 340         bss_conf->arp_addr_cnt = c;
 341
 342         /* Configure driver only if associated (which also implies it is up) */
 343         if (ifmgd->associated)
 344                 ieee80211_bss_info_change_notify(sdata,
 345                                                  BSS_CHANGED_ARP_FILTER);
 346
 347         mutex_unlock(&ifmgd->mtx);
 348
 349         return NOTIFY_DONE;
 350 }
 351 #endif
 352
 353 #if IS_ENABLED(CONFIG_IPV6)
 354 static int ieee80211_ifa6_changed(struct notifier_block *nb,
 355                                   unsigned long data, void *arg)
 356 {
 357         struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)arg;
 358         struct inet6_dev *idev = ifa->idev;
 359         struct net_device *ndev = ifa->idev->dev;
 360         struct ieee80211_local *local =
 361                 container_of(nb, struct ieee80211_local, ifa6_notifier);
 362         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 363         struct ieee80211_sub_if_data *sdata;
 364
 365         /* Make sure it's our interface that got changed */
 366         if (!wdev || wdev->wiphy != local->hw.wiphy)
 367                 return NOTIFY_DONE;
 368
 369         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 370
 371         /*
 372          * For now only support station mode. This is mostly because
 373          * doing AP would have to handle AP_VLAN in some way ...
 374          */
 375         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 376                 return NOTIFY_DONE;
 377
 378         drv_ipv6_addr_change(local, sdata, idev);
 379
 380         return NOTIFY_DONE;
 381 }
 382 #endif
 383
 384 /* There isn't a lot of sense in it, but you can transmit anything you like */
 385 static const struct ieee80211_txrx_stypes
 386 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 387         [NL80211_IFTYPE_ADHOC] = {
 388                 .tx = 0xffff,
 389                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 390                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 391                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 392                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 393         },
 394         [NL80211_IFTYPE_STATION] = {
 395                 .tx = 0xffff,
 396                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 397                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 398         },
 399         [NL80211_IFTYPE_AP] = {
 400                 .tx = 0xffff,
 401                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 402                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 403                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 404                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 405                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 406                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 407                         BIT(IEEE80211_STYPE_ACTION >> 4),
 408         },
 409         [NL80211_IFTYPE_AP_VLAN] = {
 410                 /* copy AP */
 411                 .tx = 0xffff,
 412                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 413                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 414                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 415                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 416                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 417                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 418                         BIT(IEEE80211_STYPE_ACTION >> 4),
 419         },
 420         [NL80211_IFTYPE_P2P_CLIENT] = {
 421                 .tx = 0xffff,
 422                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 423                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 424         },
 425         [NL80211_IFTYPE_P2P_GO] = {
 426                 .tx = 0xffff,
 427                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 428                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 429                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 430                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 431                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 432                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 433                         BIT(IEEE80211_STYPE_ACTION >> 4),
 434         },
 435         [NL80211_IFTYPE_MESH_POINT] = {
 436                 .tx = 0xffff,
 437                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 438                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 439                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 440         },
 441         [NL80211_IFTYPE_P2P_DEVICE] = {
 442                 .tx = 0xffff,
 443                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 444                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 445         },
 446 };
 447
 448 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
 449         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
 450                              IEEE80211_HT_AMPDU_PARM_DENSITY,
 451
 452         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 453                                 IEEE80211_HT_CAP_MAX_AMSDU |
 454                                 IEEE80211_HT_CAP_SGI_20 |
 455                                 IEEE80211_HT_CAP_SGI_40),
 456         .mcs = {
 457                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
 458                              0xff, 0xff, 0xff, 0xff, 0xff, },
 459         },
 460 };
 461
 462 static const struct ieee80211_vht_cap mac80211_vht_capa_mod_mask = {
 463         .vht_cap_info =
 464                 cpu_to_le32(IEEE80211_VHT_CAP_RXLDPC |
 465                             IEEE80211_VHT_CAP_SHORT_GI_80 |
 466                             IEEE80211_VHT_CAP_SHORT_GI_160 |
 467                             IEEE80211_VHT_CAP_RXSTBC_1 |
 468                             IEEE80211_VHT_CAP_RXSTBC_2 |
 469                             IEEE80211_VHT_CAP_RXSTBC_3 |
 470                             IEEE80211_VHT_CAP_RXSTBC_4 |
 471                             IEEE80211_VHT_CAP_TXSTBC |
 472                             IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
 473                             IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 474                             IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN |
 475                             IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
 476                             IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK),
 477         .supp_mcs = {
 478                 .rx_mcs_map = cpu_to_le16(~0),
 479                 .tx_mcs_map = cpu_to_le16(~0),
 480         },
 481 };
 482
 483 static const u8 extended_capabilities[] = {
 484         0, 0, 0, 0, 0, 0, 0,
 485         WLAN_EXT_CAPA8_OPMODE_NOTIF,
 486 };
 487
 488 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 489                                         const struct ieee80211_ops *ops)
 490 {
 491         struct ieee80211_local *local;
 492         int priv_size, i;
 493         struct wiphy *wiphy;
 494         bool use_chanctx;
 495
 496         if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
 497                     !ops->add_interface || !ops->remove_interface ||
 498                     !ops->configure_filter))
 499                 return NULL;
 500
 501         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
 502                 return NULL;
 503
 504         /* check all or no channel context operations exist */
 505         i = !!ops->add_chanctx + !!ops->remove_chanctx +
 506             !!ops->change_chanctx + !!ops->assign_vif_chanctx +
 507             !!ops->unassign_vif_chanctx;
 508         if (WARN_ON(i != 0 && i != 5))
 509                 return NULL;
 510         use_chanctx = i == 5;
 511
 512         /* Ensure 32-byte alignment of our private data and hw private data.
 513          * We use the wiphy priv data for both our ieee80211_local and for
 514          * the driver's private data
 515          *
 516          * In memory it'll be like this:
 517          *
 518          * +-------------------------+
 519          * | struct wiphy           |
 520          * +-------------------------+
 521          * | struct ieee80211_local  |
 522          * +-------------------------+
 523          * | driver's private data   |
 524          * +-------------------------+
 525          *
 526          */
 527         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 528
 529         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 530
 531         if (!wiphy)
 532                 return NULL;
 533
 534         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 535
 536         wiphy->privid = mac80211_wiphy_privid;
 537
 538         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 539                         WIPHY_FLAG_4ADDR_AP |
 540                         WIPHY_FLAG_4ADDR_STATION |
 541                         WIPHY_FLAG_REPORTS_OBSS |
 542                         WIPHY_FLAG_OFFCHAN_TX;
 543
 544         wiphy->extended_capabilities = extended_capabilities;
 545         wiphy->extended_capabilities_mask = extended_capabilities;
 546         wiphy->extended_capabilities_len = ARRAY_SIZE(extended_capabilities);
 547
 548         if (ops->remain_on_channel)
 549                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 550
 551         wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
 552                            NL80211_FEATURE_SAE |
 553                            NL80211_FEATURE_HT_IBSS |
 554                            NL80211_FEATURE_VIF_TXPOWER |
 555                            NL80211_FEATURE_USERSPACE_MPM;
 556
 557         if (!ops->hw_scan)
 558                 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
 559                                    NL80211_FEATURE_AP_SCAN;
 560
 561
 562         if (!ops->set_key)
 563                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 564
 565         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 566
 567         local = wiphy_priv(wiphy);
 568
 569         local->hw.wiphy = wiphy;
 570
 571         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 572
 573         local->ops = ops;
 574         local->use_chanctx = use_chanctx;
 575
 576         /* set up some defaults */
 577         local->hw.queues = 1;
 578         local->hw.max_rates = 1;
 579         local->hw.max_report_rates = 0;
 580         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 581         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 582         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
 583         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 584         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 585         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 586                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 587                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 588         local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 589                                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 590         local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 591         local->hw.uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 592         local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
 593         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
 594         wiphy->vht_capa_mod_mask = &mac80211_vht_capa_mod_mask;
 595
 596         INIT_LIST_HEAD(&local->interfaces);
 597
 598         __hw_addr_init(&local->mc_list);
 599
 600         mutex_init(&local->iflist_mtx);
 601         mutex_init(&local->mtx);
 602
 603         mutex_init(&local->key_mtx);
 604         spin_lock_init(&local->filter_lock);
 605         spin_lock_init(&local->rx_path_lock);
 606         spin_lock_init(&local->queue_stop_reason_lock);
 607
 608         INIT_LIST_HEAD(&local->chanctx_list);
 609         mutex_init(&local->chanctx_mtx);
 610
 611         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 612
 613         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 614
 615         INIT_WORK(&local->radar_detected_work,
 616                   ieee80211_dfs_radar_detected_work);
 617
 618         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 619         local->smps_mode = IEEE80211_SMPS_OFF;
 620
 621         INIT_WORK(&local->dynamic_ps_enable_work,
 622                   ieee80211_dynamic_ps_enable_work);
 623         INIT_WORK(&local->dynamic_ps_disable_work,
 624                   ieee80211_dynamic_ps_disable_work);
 625         setup_timer(&local->dynamic_ps_timer,
 626                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 627
 628         INIT_WORK(&local->sched_scan_stopped_work,
 629                   ieee80211_sched_scan_stopped_work);
 630
 631         spin_lock_init(&local->ack_status_lock);
 632         idr_init(&local->ack_status_frames);
 633
 634         sta_info_init(local);
 635
 636         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 637                 skb_queue_head_init(&local->pending[i]);
 638                 atomic_set(&local->agg_queue_stop[i], 0);
 639         }
 640         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 641                      (unsigned long)local);
 642
 643         tasklet_init(&local->tasklet,
 644                      ieee80211_tasklet_handler,
 645                      (unsigned long) local);
 646
 647         skb_queue_head_init(&local->skb_queue);
 648         skb_queue_head_init(&local->skb_queue_unreliable);
 649
 650         ieee80211_led_names(local);
 651
 652         ieee80211_roc_setup(local);
 653
 654         return &local->hw;
 655 }
 656 EXPORT_SYMBOL(ieee80211_alloc_hw);
 657
 658 int ieee80211_register_hw(struct ieee80211_hw *hw)
 659 {
 660         struct ieee80211_local *local = hw_to_local(hw);
 661         int result, i;
 662         enum ieee80211_band band;
 663         int channels, max_bitrates;
 664         bool supp_ht, supp_vht;
 665         netdev_features_t feature_whitelist;
 666         static const u32 cipher_suites[] = {
 667                 /* keep WEP first, it may be removed below */
 668                 WLAN_CIPHER_SUITE_WEP40,
 669                 WLAN_CIPHER_SUITE_WEP104,
 670                 WLAN_CIPHER_SUITE_TKIP,
 671                 WLAN_CIPHER_SUITE_CCMP,
 672
 673                 /* keep last -- depends on hw flags! */
 674                 WLAN_CIPHER_SUITE_AES_CMAC
 675         };
 676
 677         if (hw->flags & IEEE80211_HW_QUEUE_CONTROL &&
 678             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
 679              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
 680                 return -EINVAL;
 681
 682 #ifdef CONFIG_PM
 683         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) &&
 684             (!local->ops->suspend || !local->ops->resume))
 685                 return -EINVAL;
 686 #endif
 687
 688         if (!local->use_chanctx) {
 689                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 690                         const struct ieee80211_iface_combination *comb;
 691
 692                         comb = &local->hw.wiphy->iface_combinations[i];
 693
 694                         if (comb->num_different_channels > 1)
 695                                 return -EINVAL;
 696                 }
 697         } else {
 698                 /*
 699                  * WDS is currently prohibited when channel contexts are used
 700                  * because there's no clear definition of which channel WDS
 701                  * type interfaces use
 702                  */
 703                 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))
 704                         return -EINVAL;
 705
 706                 /* DFS currently not supported with channel context drivers */
 707                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 708                         const struct ieee80211_iface_combination *comb;
 709
 710                         comb = &local->hw.wiphy->iface_combinations[i];
 711
 712                         if (comb->radar_detect_widths)
 713                                 return -EINVAL;
 714                 }
 715         }
 716
 717         /* Only HW csum features are currently compatible with mac80211 */
 718         feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 719                             NETIF_F_HW_CSUM;
 720         if (WARN_ON(hw->netdev_features & ~feature_whitelist))
 721                 return -EINVAL;
 722
 723         if (hw->max_report_rates == 0)
 724                 hw->max_report_rates = hw->max_rates;
 725
 726         local->rx_chains = 1;
 727
 728         /*
 729          * generic code guarantees at least one band,
 730          * set this very early because much code assumes
 731          * that hw.conf.channel is assigned
 732          */
 733         channels = 0;
 734         max_bitrates = 0;
 735         supp_ht = false;
 736         supp_vht = false;
 737         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 738                 struct ieee80211_supported_band *sband;
 739
 740                 sband = local->hw.wiphy->bands[band];
 741                 if (!sband)
 742                         continue;
 743                 if (!local->use_chanctx && !local->_oper_channel) {
 744                         /* init channel we're on */
 745                         local->hw.conf.channel =
 746                         local->_oper_channel = &sband->channels[0];
 747                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 748                 }
 749                 cfg80211_chandef_create(&local->monitor_chandef,
 750                                         &sband->channels[0],
 751                                         NL80211_CHAN_NO_HT);
 752                 channels += sband->n_channels;
 753
 754                 if (max_bitrates < sband->n_bitrates)
 755                         max_bitrates = sband->n_bitrates;
 756                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 757                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
 758
 759                 if (sband->ht_cap.ht_supported)
 760                         local->rx_chains =
 761                                 max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
 762                                     local->rx_chains);
 763
 764                 /* TODO: consider VHT for RX chains, hopefully it's the same */
 765         }
 766
 767         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 768                                       sizeof(void *) * channels, GFP_KERNEL);
 769         if (!local->int_scan_req)
 770                 return -ENOMEM;
 771
 772         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 773                 if (!local->hw.wiphy->bands[band])
 774                         continue;
 775                 local->int_scan_req->rates[band] = (u32) -1;
 776         }
 777
 778         /* if low-level driver supports AP, we also support VLAN */
 779         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
 780                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 781                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 782         }
 783
 784         /* mac80211 always supports monitor */
 785         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 786         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 787
 788         /* mac80211 doesn't support more than one IBSS interface right now */
 789         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 790                 const struct ieee80211_iface_combination *c;
 791                 int j;
 792
 793                 c = &hw->wiphy->iface_combinations[i];
 794
 795                 for (j = 0; j < c->n_limits; j++)
 796                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 797                             c->limits[j].max > 1)
 798                                 return -EINVAL;
 799         }
 800
 801 #ifndef CONFIG_MAC80211_MESH
 802         /* mesh depends on Kconfig, but drivers should set it if they want */
 803         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 804 #endif
 805
 806         /* if the underlying driver supports mesh, mac80211 will (at least)
 807          * provide routing of mesh authentication frames to userspace */
 808         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 809                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 810
 811         /* mac80211 supports control port protocol changing */
 812         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 813
 814         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 815                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 816         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 817                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 818
 819         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 820              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 821              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 822
 823         /*
 824          * Calculate scan IE length -- we need this to alloc
 825          * memory and to subtract from the driver limit. It
 826          * includes the DS Params, (extended) supported rates, and HT
 827          * information -- SSID is the driver's responsibility.
 828          */
 829         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 830                 3 /* DS Params */;
 831         if (supp_ht)
 832                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 833
 834         if (supp_vht) {
 835                 local->scan_ies_len +=
 836                         2 + sizeof(struct ieee80211_vht_cap);
 837
 838                 /*
 839                  * (for now at least), drivers wanting to use VHT must
 840                  * support channel contexts, as they contain all the
 841                  * necessary VHT information and the global hw config
 842                  * doesn't (yet)
 843                  */
 844                 if (WARN_ON(!local->use_chanctx)) {
 845                         result = -EINVAL;
 846                         goto fail_wiphy_register;
 847                 }
 848         }
 849
 850         if (!local->ops->hw_scan) {
 851                 /* For hw_scan, driver needs to set these up. */
 852                 local->hw.wiphy->max_scan_ssids = 4;
 853                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 854         }
 855
 856         /*
 857          * If the driver supports any scan IEs, then assume the
 858          * limit includes the IEs mac80211 will add, otherwise
 859          * leave it at zero and let the driver sort it out; we
 860          * still pass our IEs to the driver but userspace will
 861          * not be allowed to in that case.
 862          */
 863         if (local->hw.wiphy->max_scan_ie_len)
 864                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 865
 866         /* Set up cipher suites unless driver already did */
 867         if (!local->hw.wiphy->cipher_suites) {
 868                 local->hw.wiphy->cipher_suites = cipher_suites;
 869                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 870                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 871                         local->hw.wiphy->n_cipher_suites--;
 872         }
 873         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 874                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 875                         local->hw.wiphy->cipher_suites += 2;
 876                         local->hw.wiphy->n_cipher_suites -= 2;
 877                 } else {
 878                         u32 *suites;
 879                         int r, w = 0;
 880
 881                         /* Filter out WEP */
 882
 883                         suites = kmemdup(
 884                                 local->hw.wiphy->cipher_suites,
 885                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 886                                 GFP_KERNEL);
 887                         if (!suites) {
 888                                 result = -ENOMEM;
 889                                 goto fail_wiphy_register;
 890                         }
 891                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 892                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 893                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 894                                     suite == WLAN_CIPHER_SUITE_WEP104)
 895                                         continue;
 896                                 suites[w++] = suite;
 897                         }
 898                         local->hw.wiphy->cipher_suites = suites;
 899                         local->hw.wiphy->n_cipher_suites = w;
 900                         local->wiphy_ciphers_allocated = true;
 901                 }
 902         }
 903
 904         if (!local->ops->remain_on_channel)
 905                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
 906
 907         if (local->ops->sched_scan_start)
 908                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
 909
 910         /* mac80211 based drivers don't support internal TDLS setup */
 911         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
 912                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
 913
 914         result = wiphy_register(local->hw.wiphy);
 915         if (result < 0)
 916                 goto fail_wiphy_register;
 917
 918         /*
 919          * We use the number of queues for feature tests (QoS, HT) internally
 920          * so restrict them appropriately.
 921          */
 922         if (hw->queues > IEEE80211_MAX_QUEUES)
 923                 hw->queues = IEEE80211_MAX_QUEUES;
 924
 925         local->workqueue =
 926                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
 927         if (!local->workqueue) {
 928                 result = -ENOMEM;
 929                 goto fail_workqueue;
 930         }
 931
 932         /*
 933          * The hardware needs headroom for sending the frame,
 934          * and we need some headroom for passing the frame to monitor
 935          * interfaces, but never both at the same time.
 936          */
 937         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 938                                    IEEE80211_TX_STATUS_HEADROOM);
 939
 940         debugfs_hw_add(local);
 941
 942         /*
 943          * if the driver doesn't specify a max listen interval we
 944          * use 5 which should be a safe default
 945          */
 946         if (local->hw.max_listen_interval == 0)
 947                 local->hw.max_listen_interval = 5;
 948
 949         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 950
 951         local->dynamic_ps_forced_timeout = -1;
 952
 953         result = ieee80211_wep_init(local);
 954         if (result < 0)
 955                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 956                             result);
 957
 958         ieee80211_led_init(local);
 959
 960         rtnl_lock();
 961
 962         result = ieee80211_init_rate_ctrl_alg(local,
 963                                               hw->rate_control_algorithm);
 964         if (result < 0) {
 965                 wiphy_debug(local->hw.wiphy,
 966                             "Failed to initialize rate control algorithm\n");
 967                 goto fail_rate;
 968         }
 969
 970         /* add one default STA interface if supported */
 971         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 972                 result = ieee80211_if_add(local, "wlan%d", NULL,
 973                                           NL80211_IFTYPE_STATION, NULL);
 974                 if (result)
 975                         wiphy_warn(local->hw.wiphy,
 976                                    "Failed to add default virtual iface\n");
 977         }
 978
 979         rtnl_unlock();
 980
 981         local->network_latency_notifier.notifier_call =
 982                 ieee80211_max_network_latency;
 983         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 984                                      &local->network_latency_notifier);
 985         if (result) {
 986                 rtnl_lock();
 987                 goto fail_pm_qos;
 988         }
 989
 990 #ifdef CONFIG_INET
 991         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 992         result = register_inetaddr_notifier(&local->ifa_notifier);
 993         if (result)
 994                 goto fail_ifa;
 995 #endif
 996
 997 #if IS_ENABLED(CONFIG_IPV6)
 998         local->ifa6_notifier.notifier_call = ieee80211_ifa6_changed;
 999         result = register_inet6addr_notifier(&local->ifa6_notifier);
1000         if (result)
1001                 goto fail_ifa6;
1002 #endif
1003
1004         return 0;
1005
1006 #if IS_ENABLED(CONFIG_IPV6)
1007  fail_ifa6:
1008 #ifdef CONFIG_INET
1009         unregister_inetaddr_notifier(&local->ifa_notifier);
1010 #endif
1011 #endif
1012 #if defined(CONFIG_INET) || defined(CONFIG_IPV6)
1013  fail_ifa:
1014         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1015                                &local->network_latency_notifier);
1016         rtnl_lock();
1017 #endif
1018  fail_pm_qos:
1019         ieee80211_led_exit(local);
1020         ieee80211_remove_interfaces(local);
1021  fail_rate:
1022         rtnl_unlock();
1023         ieee80211_wep_free(local);
1024         sta_info_stop(local);
1025         destroy_workqueue(local->workqueue);
1026  fail_workqueue:
1027         wiphy_unregister(local->hw.wiphy);
1028  fail_wiphy_register:
1029         if (local->wiphy_ciphers_allocated)
1030                 kfree(local->hw.wiphy->cipher_suites);
1031         kfree(local->int_scan_req);
1032         return result;
1033 }
1034 EXPORT_SYMBOL(ieee80211_register_hw);
1035
1036 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1037 {
1038         struct ieee80211_local *local = hw_to_local(hw);
1039
1040         tasklet_kill(&local->tx_pending_tasklet);
1041         tasklet_kill(&local->tasklet);
1042
1043         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1044                                &local->network_latency_notifier);
1045 #ifdef CONFIG_INET
1046         unregister_inetaddr_notifier(&local->ifa_notifier);
1047 #endif
1048 #if IS_ENABLED(CONFIG_IPV6)
1049         unregister_inet6addr_notifier(&local->ifa6_notifier);
1050 #endif
1051
1052         rtnl_lock();
1053
1054         /*
1055          * At this point, interface list manipulations are fine
1056          * because the driver cannot be handing us frames any
1057          * more and the tasklet is killed.
1058          */
1059         ieee80211_remove_interfaces(local);
1060
1061         rtnl_unlock();
1062
1063         cancel_work_sync(&local->restart_work);
1064         cancel_work_sync(&local->reconfig_filter);
1065
1066         ieee80211_clear_tx_pending(local);
1067         rate_control_deinitialize(local);
1068
1069         if (skb_queue_len(&local->skb_queue) ||
1070             skb_queue_len(&local->skb_queue_unreliable))
1071                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1072         skb_queue_purge(&local->skb_queue);
1073         skb_queue_purge(&local->skb_queue_unreliable);
1074
1075         destroy_workqueue(local->workqueue);
1076         wiphy_unregister(local->hw.wiphy);
1077         sta_info_stop(local);
1078         ieee80211_wep_free(local);
1079         ieee80211_led_exit(local);
1080         kfree(local->int_scan_req);
1081 }
1082 EXPORT_SYMBOL(ieee80211_unregister_hw);
1083
1084 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1085 {
1086         WARN_ONCE(1, "Have pending ack frames!\n");
1087         kfree_skb(p);
1088         return 0;
1089 }
1090
1091 void ieee80211_free_hw(struct ieee80211_hw *hw)
1092 {
1093         struct ieee80211_local *local = hw_to_local(hw);
1094
1095         mutex_destroy(&local->iflist_mtx);
1096         mutex_destroy(&local->mtx);
1097
1098         if (local->wiphy_ciphers_allocated)
1099                 kfree(local->hw.wiphy->cipher_suites);
1100
1101         idr_for_each(&local->ack_status_frames,
1102                      ieee80211_free_ack_frame, NULL);
1103         idr_destroy(&local->ack_status_frames);
1104
1105         wiphy_free(local->hw.wiphy);
1106 }
1107 EXPORT_SYMBOL(ieee80211_free_hw);
1108
1109 static int __init ieee80211_init(void)
1110 {
1111         struct sk_buff *skb;
1112         int ret;
1113
1114         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1115         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1116                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1117
1118         ret = rc80211_minstrel_init();
1119         if (ret)
1120                 return ret;
1121
1122         ret = rc80211_minstrel_ht_init();
1123         if (ret)
1124                 goto err_minstrel;
1125
1126         ret = rc80211_pid_init();
1127         if (ret)
1128                 goto err_pid;
1129
1130         ret = ieee80211_iface_init();
1131         if (ret)
1132                 goto err_netdev;
1133
1134         return 0;
1135  err_netdev:
1136         rc80211_pid_exit();
1137  err_pid:
1138         rc80211_minstrel_ht_exit();
1139  err_minstrel:
1140         rc80211_minstrel_exit();
1141
1142         return ret;
1143 }
1144
1145 static void __exit ieee80211_exit(void)
1146 {
1147         rc80211_pid_exit();
1148         rc80211_minstrel_ht_exit();
1149         rc80211_minstrel_exit();
1150
1151         ieee80211s_stop();
1152
1153         ieee80211_iface_exit();
1154
1155         rcu_barrier();
1156 }
1157
1158
1159 subsys_initcall(ieee80211_init);
1160 module_exit(ieee80211_exit);
1161
1162 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1163 MODULE_LICENSE("GPL");