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 cfg80211_chan_def chandef = {};
  99         u32 changed = 0;
 100         int power;
 101         u32 offchannel_flag;
 102
 103         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 104
 105         if (local->scan_channel) {
 106                 chandef.chan = local->scan_channel;
 107                 /* If scanning on oper channel, use whatever channel-type
 108                  * is currently in use.
 109                  */
 110                 if (chandef.chan == local->_oper_chandef.chan) {
 111                         chandef = local->_oper_chandef;
 112                 } else {
 113                         chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
 114                         chandef.center_freq1 = chandef.chan->center_freq;
 115                 }
 116         } else if (local->tmp_channel) {
 117                 chandef.chan = local->tmp_channel;
 118                 chandef.width = NL80211_CHAN_WIDTH_20_NOHT;
 119                 chandef.center_freq1 = chandef.chan->center_freq;
 120         } else
 121                 chandef = local->_oper_chandef;
 122
 123         WARN(!cfg80211_chandef_valid(&chandef),
 124              "control:%d MHz width:%d center: %d/%d MHz",
 125              chandef.chan->center_freq, chandef.width,
 126              chandef.center_freq1, chandef.center_freq2);
 127
 128         if (!cfg80211_chandef_identical(&chandef, &local->_oper_chandef))
 129                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 130         else
 131                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 132
 133         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 134
 135         if (offchannel_flag ||
 136             !cfg80211_chandef_identical(&local->hw.conf.chandef,
 137                                         &local->_oper_chandef)) {
 138                 local->hw.conf.chandef = chandef;
 139                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 140         }
 141
 142         if (!conf_is_ht(&local->hw.conf)) {
 143                 /*
 144                  * mac80211.h documents that this is only valid
 145                  * when the channel is set to an HT type, and
 146                  * that otherwise STATIC is used.
 147                  */
 148                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 149         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 150                 local->hw.conf.smps_mode = local->smps_mode;
 151                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 152         }
 153
 154         power = chandef.chan->max_power;
 155
 156         rcu_read_lock();
 157         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 158                 if (!rcu_access_pointer(sdata->vif.chanctx_conf))
 159                         continue;
 160                 power = min(power, sdata->vif.bss_conf.txpower);
 161         }
 162         rcu_read_unlock();
 163
 164         if (local->hw.conf.power_level != power) {
 165                 changed |= IEEE80211_CONF_CHANGE_POWER;
 166                 local->hw.conf.power_level = power;
 167         }
 168
 169         return changed;
 170 }
 171
 172 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 173 {
 174         int ret = 0;
 175
 176         might_sleep();
 177
 178         if (!local->use_chanctx)
 179                 changed |= ieee80211_hw_conf_chan(local);
 180         else
 181                 changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL |
 182                              IEEE80211_CONF_CHANGE_POWER);
 183
 184         if (changed && local->open_count) {
 185                 ret = drv_config(local, changed);
 186                 /*
 187                  * Goal:
 188                  * HW reconfiguration should never fail, the driver has told
 189                  * us what it can support so it should live up to that promise.
 190                  *
 191                  * Current status:
 192                  * rfkill is not integrated with mac80211 and a
 193                  * configuration command can thus fail if hardware rfkill
 194                  * is enabled
 195                  *
 196                  * FIXME: integrate rfkill with mac80211 and then add this
 197                  * WARN_ON() back
 198                  *
 199                  */
 200                 /* WARN_ON(ret); */
 201         }
 202
 203         return ret;
 204 }
 205
 206 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 207                                       u32 changed)
 208 {
 209         struct ieee80211_local *local = sdata->local;
 210
 211         if (!changed)
 212                 return;
 213
 214         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 215 }
 216
 217 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 218 {
 219         sdata->vif.bss_conf.use_cts_prot = false;
 220         sdata->vif.bss_conf.use_short_preamble = false;
 221         sdata->vif.bss_conf.use_short_slot = false;
 222         return BSS_CHANGED_ERP_CTS_PROT |
 223                BSS_CHANGED_ERP_PREAMBLE |
 224                BSS_CHANGED_ERP_SLOT;
 225 }
 226
 227 static void ieee80211_tasklet_handler(unsigned long data)
 228 {
 229         struct ieee80211_local *local = (struct ieee80211_local *) data;
 230         struct sk_buff *skb;
 231
 232         while ((skb = skb_dequeue(&local->skb_queue)) ||
 233                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 234                 switch (skb->pkt_type) {
 235                 case IEEE80211_RX_MSG:
 236                         /* Clear skb->pkt_type in order to not confuse kernel
 237                          * netstack. */
 238                         skb->pkt_type = 0;
 239                         ieee80211_rx(&local->hw, skb);
 240                         break;
 241                 case IEEE80211_TX_STATUS_MSG:
 242                         skb->pkt_type = 0;
 243                         ieee80211_tx_status(&local->hw, skb);
 244                         break;
 245                 default:
 246                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 247                              skb->pkt_type);
 248                         dev_kfree_skb(skb);
 249                         break;
 250                 }
 251         }
 252 }
 253
 254 static void ieee80211_restart_work(struct work_struct *work)
 255 {
 256         struct ieee80211_local *local =
 257                 container_of(work, struct ieee80211_local, restart_work);
 258
 259         /* wait for scan work complete */
 260         flush_workqueue(local->workqueue);
 261
 262         mutex_lock(&local->mtx);
 263         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
 264              rcu_dereference_protected(local->sched_scan_sdata,
 265                                        lockdep_is_held(&local->mtx)),
 266                 "%s called with hardware scan in progress\n", __func__);
 267         mutex_unlock(&local->mtx);
 268
 269         rtnl_lock();
 270         ieee80211_scan_cancel(local);
 271         ieee80211_reconfig(local);
 272         rtnl_unlock();
 273 }
 274
 275 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 276 {
 277         struct ieee80211_local *local = hw_to_local(hw);
 278
 279         trace_api_restart_hw(local);
 280
 281         wiphy_info(hw->wiphy,
 282                    "Hardware restart was requested\n");
 283
 284         /* use this reason, ieee80211_reconfig will unblock it */
 285         ieee80211_stop_queues_by_reason(hw, IEEE80211_MAX_QUEUE_MAP,
 286                                         IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 287
 288         /*
 289          * Stop all Rx during the reconfig. We don't want state changes
 290          * or driver callbacks while this is in progress.
 291          */
 292         local->in_reconfig = true;
 293         barrier();
 294
 295         schedule_work(&local->restart_work);
 296 }
 297 EXPORT_SYMBOL(ieee80211_restart_hw);
 298
 299 #ifdef CONFIG_INET
 300 static int ieee80211_ifa_changed(struct notifier_block *nb,
 301                                  unsigned long data, void *arg)
 302 {
 303         struct in_ifaddr *ifa = arg;
 304         struct ieee80211_local *local =
 305                 container_of(nb, struct ieee80211_local,
 306                              ifa_notifier);
 307         struct net_device *ndev = ifa->ifa_dev->dev;
 308         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 309         struct in_device *idev;
 310         struct ieee80211_sub_if_data *sdata;
 311         struct ieee80211_bss_conf *bss_conf;
 312         struct ieee80211_if_managed *ifmgd;
 313         int c = 0;
 314
 315         /* Make sure it's our interface that got changed */
 316         if (!wdev)
 317                 return NOTIFY_DONE;
 318
 319         if (wdev->wiphy != local->hw.wiphy)
 320                 return NOTIFY_DONE;
 321
 322         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 323         bss_conf = &sdata->vif.bss_conf;
 324
 325         /* ARP filtering is only supported in managed mode */
 326         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 327                 return NOTIFY_DONE;
 328
 329         idev = __in_dev_get_rtnl(sdata->dev);
 330         if (!idev)
 331                 return NOTIFY_DONE;
 332
 333         ifmgd = &sdata->u.mgd;
 334         mutex_lock(&ifmgd->mtx);
 335
 336         /* Copy the addresses to the bss_conf list */
 337         ifa = idev->ifa_list;
 338         while (ifa) {
 339                 if (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN)
 340                         bss_conf->arp_addr_list[c] = ifa->ifa_address;
 341                 ifa = ifa->ifa_next;
 342                 c++;
 343         }
 344
 345         bss_conf->arp_addr_cnt = c;
 346
 347         /* Configure driver only if associated (which also implies it is up) */
 348         if (ifmgd->associated)
 349                 ieee80211_bss_info_change_notify(sdata,
 350                                                  BSS_CHANGED_ARP_FILTER);
 351
 352         mutex_unlock(&ifmgd->mtx);
 353
 354         return NOTIFY_DONE;
 355 }
 356 #endif
 357
 358 #if IS_ENABLED(CONFIG_IPV6)
 359 static int ieee80211_ifa6_changed(struct notifier_block *nb,
 360                                   unsigned long data, void *arg)
 361 {
 362         struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)arg;
 363         struct inet6_dev *idev = ifa->idev;
 364         struct net_device *ndev = ifa->idev->dev;
 365         struct ieee80211_local *local =
 366                 container_of(nb, struct ieee80211_local, ifa6_notifier);
 367         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 368         struct ieee80211_sub_if_data *sdata;
 369
 370         /* Make sure it's our interface that got changed */
 371         if (!wdev || wdev->wiphy != local->hw.wiphy)
 372                 return NOTIFY_DONE;
 373
 374         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 375
 376         /*
 377          * For now only support station mode. This is mostly because
 378          * doing AP would have to handle AP_VLAN in some way ...
 379          */
 380         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 381                 return NOTIFY_DONE;
 382
 383         drv_ipv6_addr_change(local, sdata, idev);
 384
 385         return NOTIFY_DONE;
 386 }
 387 #endif
 388
 389 /* There isn't a lot of sense in it, but you can transmit anything you like */
 390 static const struct ieee80211_txrx_stypes
 391 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 392         [NL80211_IFTYPE_ADHOC] = {
 393                 .tx = 0xffff,
 394                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 395                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 396                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 397                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 398         },
 399         [NL80211_IFTYPE_STATION] = {
 400                 .tx = 0xffff,
 401                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 402                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 403         },
 404         [NL80211_IFTYPE_AP] = {
 405                 .tx = 0xffff,
 406                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 407                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 408                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 409                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 410                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 411                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 412                         BIT(IEEE80211_STYPE_ACTION >> 4),
 413         },
 414         [NL80211_IFTYPE_AP_VLAN] = {
 415                 /* copy AP */
 416                 .tx = 0xffff,
 417                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 418                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 419                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 420                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 421                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 422                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 423                         BIT(IEEE80211_STYPE_ACTION >> 4),
 424         },
 425         [NL80211_IFTYPE_P2P_CLIENT] = {
 426                 .tx = 0xffff,
 427                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 428                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 429         },
 430         [NL80211_IFTYPE_P2P_GO] = {
 431                 .tx = 0xffff,
 432                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 433                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 434                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 435                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 436                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 437                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 438                         BIT(IEEE80211_STYPE_ACTION >> 4),
 439         },
 440         [NL80211_IFTYPE_MESH_POINT] = {
 441                 .tx = 0xffff,
 442                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 443                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 444                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 445         },
 446         [NL80211_IFTYPE_P2P_DEVICE] = {
 447                 .tx = 0xffff,
 448                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 449                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 450         },
 451 };
 452
 453 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
 454         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
 455                              IEEE80211_HT_AMPDU_PARM_DENSITY,
 456
 457         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 458                                 IEEE80211_HT_CAP_MAX_AMSDU |
 459                                 IEEE80211_HT_CAP_SGI_20 |
 460                                 IEEE80211_HT_CAP_SGI_40),
 461         .mcs = {
 462                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
 463                              0xff, 0xff, 0xff, 0xff, 0xff, },
 464         },
 465 };
 466
 467 static const struct ieee80211_vht_cap mac80211_vht_capa_mod_mask = {
 468         .vht_cap_info =
 469                 cpu_to_le32(IEEE80211_VHT_CAP_RXLDPC |
 470                             IEEE80211_VHT_CAP_SHORT_GI_80 |
 471                             IEEE80211_VHT_CAP_SHORT_GI_160 |
 472                             IEEE80211_VHT_CAP_RXSTBC_1 |
 473                             IEEE80211_VHT_CAP_RXSTBC_2 |
 474                             IEEE80211_VHT_CAP_RXSTBC_3 |
 475                             IEEE80211_VHT_CAP_RXSTBC_4 |
 476                             IEEE80211_VHT_CAP_TXSTBC |
 477                             IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
 478                             IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 479                             IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN |
 480                             IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
 481                             IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK),
 482         .supp_mcs = {
 483                 .rx_mcs_map = cpu_to_le16(~0),
 484                 .tx_mcs_map = cpu_to_le16(~0),
 485         },
 486 };
 487
 488 static const u8 extended_capabilities[] = {
 489         0, 0, 0, 0, 0, 0, 0,
 490         WLAN_EXT_CAPA8_OPMODE_NOTIF,
 491 };
 492
 493 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 494                                         const struct ieee80211_ops *ops)
 495 {
 496         struct ieee80211_local *local;
 497         int priv_size, i;
 498         struct wiphy *wiphy;
 499         bool use_chanctx;
 500
 501         if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
 502                     !ops->add_interface || !ops->remove_interface ||
 503                     !ops->configure_filter))
 504                 return NULL;
 505
 506         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
 507                 return NULL;
 508
 509         /* check all or no channel context operations exist */
 510         i = !!ops->add_chanctx + !!ops->remove_chanctx +
 511             !!ops->change_chanctx + !!ops->assign_vif_chanctx +
 512             !!ops->unassign_vif_chanctx;
 513         if (WARN_ON(i != 0 && i != 5))
 514                 return NULL;
 515         use_chanctx = i == 5;
 516
 517         /* Ensure 32-byte alignment of our private data and hw private data.
 518          * We use the wiphy priv data for both our ieee80211_local and for
 519          * the driver's private data
 520          *
 521          * In memory it'll be like this:
 522          *
 523          * +-------------------------+
 524          * | struct wiphy           |
 525          * +-------------------------+
 526          * | struct ieee80211_local  |
 527          * +-------------------------+
 528          * | driver's private data   |
 529          * +-------------------------+
 530          *
 531          */
 532         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 533
 534         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 535
 536         if (!wiphy)
 537                 return NULL;
 538
 539         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 540
 541         wiphy->privid = mac80211_wiphy_privid;
 542
 543         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 544                         WIPHY_FLAG_4ADDR_AP |
 545                         WIPHY_FLAG_4ADDR_STATION |
 546                         WIPHY_FLAG_REPORTS_OBSS |
 547                         WIPHY_FLAG_OFFCHAN_TX;
 548
 549         wiphy->extended_capabilities = extended_capabilities;
 550         wiphy->extended_capabilities_mask = extended_capabilities;
 551         wiphy->extended_capabilities_len = ARRAY_SIZE(extended_capabilities);
 552
 553         if (ops->remain_on_channel)
 554                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 555
 556         wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
 557                            NL80211_FEATURE_SAE |
 558                            NL80211_FEATURE_HT_IBSS |
 559                            NL80211_FEATURE_VIF_TXPOWER |
 560                            NL80211_FEATURE_USERSPACE_MPM;
 561
 562         if (!ops->hw_scan)
 563                 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
 564                                    NL80211_FEATURE_AP_SCAN;
 565
 566
 567         if (!ops->set_key)
 568                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 569
 570         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 571
 572         local = wiphy_priv(wiphy);
 573
 574         local->hw.wiphy = wiphy;
 575
 576         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 577
 578         local->ops = ops;
 579         local->use_chanctx = use_chanctx;
 580
 581         /* set up some defaults */
 582         local->hw.queues = 1;
 583         local->hw.max_rates = 1;
 584         local->hw.max_report_rates = 0;
 585         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 586         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 587         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
 588         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 589         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 590         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 591                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 592                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 593         local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 594                                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 595         local->hw.uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 596         local->hw.uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 597         local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
 598         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
 599         wiphy->vht_capa_mod_mask = &mac80211_vht_capa_mod_mask;
 600
 601         INIT_LIST_HEAD(&local->interfaces);
 602
 603         __hw_addr_init(&local->mc_list);
 604
 605         mutex_init(&local->iflist_mtx);
 606         mutex_init(&local->mtx);
 607
 608         mutex_init(&local->key_mtx);
 609         spin_lock_init(&local->filter_lock);
 610         spin_lock_init(&local->rx_path_lock);
 611         spin_lock_init(&local->queue_stop_reason_lock);
 612
 613         INIT_LIST_HEAD(&local->chanctx_list);
 614         mutex_init(&local->chanctx_mtx);
 615
 616         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 617
 618         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 619
 620         INIT_WORK(&local->radar_detected_work,
 621                   ieee80211_dfs_radar_detected_work);
 622
 623         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 624         local->smps_mode = IEEE80211_SMPS_OFF;
 625
 626         INIT_WORK(&local->dynamic_ps_enable_work,
 627                   ieee80211_dynamic_ps_enable_work);
 628         INIT_WORK(&local->dynamic_ps_disable_work,
 629                   ieee80211_dynamic_ps_disable_work);
 630         setup_timer(&local->dynamic_ps_timer,
 631                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 632
 633         INIT_WORK(&local->sched_scan_stopped_work,
 634                   ieee80211_sched_scan_stopped_work);
 635
 636         spin_lock_init(&local->ack_status_lock);
 637         idr_init(&local->ack_status_frames);
 638
 639         sta_info_init(local);
 640
 641         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 642                 skb_queue_head_init(&local->pending[i]);
 643                 atomic_set(&local->agg_queue_stop[i], 0);
 644         }
 645         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 646                      (unsigned long)local);
 647
 648         tasklet_init(&local->tasklet,
 649                      ieee80211_tasklet_handler,
 650                      (unsigned long) local);
 651
 652         skb_queue_head_init(&local->skb_queue);
 653         skb_queue_head_init(&local->skb_queue_unreliable);
 654
 655         ieee80211_led_names(local);
 656
 657         ieee80211_roc_setup(local);
 658
 659         return &local->hw;
 660 }
 661 EXPORT_SYMBOL(ieee80211_alloc_hw);
 662
 663 int ieee80211_register_hw(struct ieee80211_hw *hw)
 664 {
 665         struct ieee80211_local *local = hw_to_local(hw);
 666         int result, i;
 667         enum ieee80211_band band;
 668         int channels, max_bitrates;
 669         bool supp_ht, supp_vht;
 670         netdev_features_t feature_whitelist;
 671         struct cfg80211_chan_def dflt_chandef = {};
 672         static const u32 cipher_suites[] = {
 673                 /* keep WEP first, it may be removed below */
 674                 WLAN_CIPHER_SUITE_WEP40,
 675                 WLAN_CIPHER_SUITE_WEP104,
 676                 WLAN_CIPHER_SUITE_TKIP,
 677                 WLAN_CIPHER_SUITE_CCMP,
 678
 679                 /* keep last -- depends on hw flags! */
 680                 WLAN_CIPHER_SUITE_AES_CMAC
 681         };
 682
 683         if (hw->flags & IEEE80211_HW_QUEUE_CONTROL &&
 684             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
 685              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
 686                 return -EINVAL;
 687
 688 #ifdef CONFIG_PM
 689         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) &&
 690             (!local->ops->suspend || !local->ops->resume))
 691                 return -EINVAL;
 692 #endif
 693
 694         if (!local->use_chanctx) {
 695                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 696                         const struct ieee80211_iface_combination *comb;
 697
 698                         comb = &local->hw.wiphy->iface_combinations[i];
 699
 700                         if (comb->num_different_channels > 1)
 701                                 return -EINVAL;
 702                 }
 703         } else {
 704                 /*
 705                  * WDS is currently prohibited when channel contexts are used
 706                  * because there's no clear definition of which channel WDS
 707                  * type interfaces use
 708                  */
 709                 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))
 710                         return -EINVAL;
 711
 712                 /* DFS currently not supported with channel context drivers */
 713                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 714                         const struct ieee80211_iface_combination *comb;
 715
 716                         comb = &local->hw.wiphy->iface_combinations[i];
 717
 718                         if (comb->radar_detect_widths)
 719                                 return -EINVAL;
 720                 }
 721         }
 722
 723         /* Only HW csum features are currently compatible with mac80211 */
 724         feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 725                             NETIF_F_HW_CSUM;
 726         if (WARN_ON(hw->netdev_features & ~feature_whitelist))
 727                 return -EINVAL;
 728
 729         if (hw->max_report_rates == 0)
 730                 hw->max_report_rates = hw->max_rates;
 731
 732         local->rx_chains = 1;
 733
 734         /*
 735          * generic code guarantees at least one band,
 736          * set this very early because much code assumes
 737          * that hw.conf.channel is assigned
 738          */
 739         channels = 0;
 740         max_bitrates = 0;
 741         supp_ht = false;
 742         supp_vht = false;
 743         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 744                 struct ieee80211_supported_band *sband;
 745
 746                 sband = local->hw.wiphy->bands[band];
 747                 if (!sband)
 748                         continue;
 749
 750                 if (!dflt_chandef.chan) {
 751                         cfg80211_chandef_create(&dflt_chandef,
 752                                                 &sband->channels[0],
 753                                                 NL80211_CHAN_NO_HT);
 754                         /* init channel we're on */
 755                         if (!local->use_chanctx && !local->_oper_chandef.chan) {
 756                                 local->hw.conf.chandef = dflt_chandef;
 757                                 local->_oper_chandef = dflt_chandef;
 758                         }
 759                         local->monitor_chandef = dflt_chandef;
 760                 }
 761
 762                 channels += sband->n_channels;
 763
 764                 if (max_bitrates < sband->n_bitrates)
 765                         max_bitrates = sband->n_bitrates;
 766                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 767                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
 768
 769                 if (sband->ht_cap.ht_supported)
 770                         local->rx_chains =
 771                                 max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
 772                                     local->rx_chains);
 773
 774                 /* TODO: consider VHT for RX chains, hopefully it's the same */
 775         }
 776
 777         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 778                                       sizeof(void *) * channels, GFP_KERNEL);
 779         if (!local->int_scan_req)
 780                 return -ENOMEM;
 781
 782         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 783                 if (!local->hw.wiphy->bands[band])
 784                         continue;
 785                 local->int_scan_req->rates[band] = (u32) -1;
 786         }
 787
 788         /* if low-level driver supports AP, we also support VLAN */
 789         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
 790                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 791                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 792         }
 793
 794         /* mac80211 always supports monitor */
 795         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 796         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 797
 798         /* mac80211 doesn't support more than one IBSS interface right now */
 799         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 800                 const struct ieee80211_iface_combination *c;
 801                 int j;
 802
 803                 c = &hw->wiphy->iface_combinations[i];
 804
 805                 for (j = 0; j < c->n_limits; j++)
 806                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 807                             c->limits[j].max > 1)
 808                                 return -EINVAL;
 809         }
 810
 811 #ifndef CONFIG_MAC80211_MESH
 812         /* mesh depends on Kconfig, but drivers should set it if they want */
 813         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 814 #endif
 815
 816         /* if the underlying driver supports mesh, mac80211 will (at least)
 817          * provide routing of mesh authentication frames to userspace */
 818         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 819                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 820
 821         /* mac80211 supports control port protocol changing */
 822         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 823
 824         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 825                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 826         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 827                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 828
 829         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 830              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 831              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 832
 833         /*
 834          * Calculate scan IE length -- we need this to alloc
 835          * memory and to subtract from the driver limit. It
 836          * includes the DS Params, (extended) supported rates, and HT
 837          * information -- SSID is the driver's responsibility.
 838          */
 839         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 840                 3 /* DS Params */;
 841         if (supp_ht)
 842                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 843
 844         if (supp_vht)
 845                 local->scan_ies_len +=
 846                         2 + sizeof(struct ieee80211_vht_cap);
 847
 848         if (!local->ops->hw_scan) {
 849                 /* For hw_scan, driver needs to set these up. */
 850                 local->hw.wiphy->max_scan_ssids = 4;
 851                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 852         }
 853
 854         /*
 855          * If the driver supports any scan IEs, then assume the
 856          * limit includes the IEs mac80211 will add, otherwise
 857          * leave it at zero and let the driver sort it out; we
 858          * still pass our IEs to the driver but userspace will
 859          * not be allowed to in that case.
 860          */
 861         if (local->hw.wiphy->max_scan_ie_len)
 862                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 863
 864         /* Set up cipher suites unless driver already did */
 865         if (!local->hw.wiphy->cipher_suites) {
 866                 local->hw.wiphy->cipher_suites = cipher_suites;
 867                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 868                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 869                         local->hw.wiphy->n_cipher_suites--;
 870         }
 871         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 872                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 873                         local->hw.wiphy->cipher_suites += 2;
 874                         local->hw.wiphy->n_cipher_suites -= 2;
 875                 } else {
 876                         u32 *suites;
 877                         int r, w = 0;
 878
 879                         /* Filter out WEP */
 880
 881                         suites = kmemdup(
 882                                 local->hw.wiphy->cipher_suites,
 883                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 884                                 GFP_KERNEL);
 885                         if (!suites) {
 886                                 result = -ENOMEM;
 887                                 goto fail_wiphy_register;
 888                         }
 889                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 890                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 891                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 892                                     suite == WLAN_CIPHER_SUITE_WEP104)
 893                                         continue;
 894                                 suites[w++] = suite;
 895                         }
 896                         local->hw.wiphy->cipher_suites = suites;
 897                         local->hw.wiphy->n_cipher_suites = w;
 898                         local->wiphy_ciphers_allocated = true;
 899                 }
 900         }
 901
 902         if (!local->ops->remain_on_channel)
 903                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
 904
 905         if (local->ops->sched_scan_start)
 906                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
 907
 908         /* mac80211 based drivers don't support internal TDLS setup */
 909         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
 910                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
 911
 912         result = wiphy_register(local->hw.wiphy);
 913         if (result < 0)
 914                 goto fail_wiphy_register;
 915
 916         /*
 917          * We use the number of queues for feature tests (QoS, HT) internally
 918          * so restrict them appropriately.
 919          */
 920         if (hw->queues > IEEE80211_MAX_QUEUES)
 921                 hw->queues = IEEE80211_MAX_QUEUES;
 922
 923         local->workqueue =
 924                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
 925         if (!local->workqueue) {
 926                 result = -ENOMEM;
 927                 goto fail_workqueue;
 928         }
 929
 930         /*
 931          * The hardware needs headroom for sending the frame,
 932          * and we need some headroom for passing the frame to monitor
 933          * interfaces, but never both at the same time.
 934          */
 935         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 936                                    IEEE80211_TX_STATUS_HEADROOM);
 937
 938         debugfs_hw_add(local);
 939
 940         /*
 941          * if the driver doesn't specify a max listen interval we
 942          * use 5 which should be a safe default
 943          */
 944         if (local->hw.max_listen_interval == 0)
 945                 local->hw.max_listen_interval = 5;
 946
 947         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 948
 949         local->dynamic_ps_forced_timeout = -1;
 950
 951         result = ieee80211_wep_init(local);
 952         if (result < 0)
 953                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 954                             result);
 955
 956         ieee80211_led_init(local);
 957
 958         rtnl_lock();
 959
 960         result = ieee80211_init_rate_ctrl_alg(local,
 961                                               hw->rate_control_algorithm);
 962         if (result < 0) {
 963                 wiphy_debug(local->hw.wiphy,
 964                             "Failed to initialize rate control algorithm\n");
 965                 goto fail_rate;
 966         }
 967
 968         /* add one default STA interface if supported */
 969         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 970                 result = ieee80211_if_add(local, "wlan%d", NULL,
 971                                           NL80211_IFTYPE_STATION, NULL);
 972                 if (result)
 973                         wiphy_warn(local->hw.wiphy,
 974                                    "Failed to add default virtual iface\n");
 975         }
 976
 977         rtnl_unlock();
 978
 979         local->network_latency_notifier.notifier_call =
 980                 ieee80211_max_network_latency;
 981         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 982                                      &local->network_latency_notifier);
 983         if (result) {
 984                 rtnl_lock();
 985                 goto fail_pm_qos;
 986         }
 987
 988 #ifdef CONFIG_INET
 989         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 990         result = register_inetaddr_notifier(&local->ifa_notifier);
 991         if (result)
 992                 goto fail_ifa;
 993 #endif
 994
 995 #if IS_ENABLED(CONFIG_IPV6)
 996         local->ifa6_notifier.notifier_call = ieee80211_ifa6_changed;
 997         result = register_inet6addr_notifier(&local->ifa6_notifier);
 998         if (result)
 999                 goto fail_ifa6;
1000 #endif
1001
1002         return 0;
1003
1004 #if IS_ENABLED(CONFIG_IPV6)
1005  fail_ifa6:
1006 #ifdef CONFIG_INET
1007         unregister_inetaddr_notifier(&local->ifa_notifier);
1008 #endif
1009 #endif
1010 #if defined(CONFIG_INET) || defined(CONFIG_IPV6)
1011  fail_ifa:
1012         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1013                                &local->network_latency_notifier);
1014         rtnl_lock();
1015 #endif
1016  fail_pm_qos:
1017         ieee80211_led_exit(local);
1018         ieee80211_remove_interfaces(local);
1019  fail_rate:
1020         rtnl_unlock();
1021         ieee80211_wep_free(local);
1022         sta_info_stop(local);
1023         destroy_workqueue(local->workqueue);
1024  fail_workqueue:
1025         wiphy_unregister(local->hw.wiphy);
1026  fail_wiphy_register:
1027         if (local->wiphy_ciphers_allocated)
1028                 kfree(local->hw.wiphy->cipher_suites);
1029         kfree(local->int_scan_req);
1030         return result;
1031 }
1032 EXPORT_SYMBOL(ieee80211_register_hw);
1033
1034 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1035 {
1036         struct ieee80211_local *local = hw_to_local(hw);
1037
1038         tasklet_kill(&local->tx_pending_tasklet);
1039         tasklet_kill(&local->tasklet);
1040
1041         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1042                                &local->network_latency_notifier);
1043 #ifdef CONFIG_INET
1044         unregister_inetaddr_notifier(&local->ifa_notifier);
1045 #endif
1046 #if IS_ENABLED(CONFIG_IPV6)
1047         unregister_inet6addr_notifier(&local->ifa6_notifier);
1048 #endif
1049
1050         rtnl_lock();
1051
1052         /*
1053          * At this point, interface list manipulations are fine
1054          * because the driver cannot be handing us frames any
1055          * more and the tasklet is killed.
1056          */
1057         ieee80211_remove_interfaces(local);
1058
1059         rtnl_unlock();
1060
1061         cancel_work_sync(&local->restart_work);
1062         cancel_work_sync(&local->reconfig_filter);
1063
1064         ieee80211_clear_tx_pending(local);
1065         rate_control_deinitialize(local);
1066
1067         if (skb_queue_len(&local->skb_queue) ||
1068             skb_queue_len(&local->skb_queue_unreliable))
1069                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1070         skb_queue_purge(&local->skb_queue);
1071         skb_queue_purge(&local->skb_queue_unreliable);
1072
1073         destroy_workqueue(local->workqueue);
1074         wiphy_unregister(local->hw.wiphy);
1075         sta_info_stop(local);
1076         ieee80211_wep_free(local);
1077         ieee80211_led_exit(local);
1078         kfree(local->int_scan_req);
1079 }
1080 EXPORT_SYMBOL(ieee80211_unregister_hw);
1081
1082 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1083 {
1084         WARN_ONCE(1, "Have pending ack frames!\n");
1085         kfree_skb(p);
1086         return 0;
1087 }
1088
1089 void ieee80211_free_hw(struct ieee80211_hw *hw)
1090 {
1091         struct ieee80211_local *local = hw_to_local(hw);
1092
1093         mutex_destroy(&local->iflist_mtx);
1094         mutex_destroy(&local->mtx);
1095
1096         if (local->wiphy_ciphers_allocated)
1097                 kfree(local->hw.wiphy->cipher_suites);
1098
1099         idr_for_each(&local->ack_status_frames,
1100                      ieee80211_free_ack_frame, NULL);
1101         idr_destroy(&local->ack_status_frames);
1102
1103         wiphy_free(local->hw.wiphy);
1104 }
1105 EXPORT_SYMBOL(ieee80211_free_hw);
1106
1107 static int __init ieee80211_init(void)
1108 {
1109         struct sk_buff *skb;
1110         int ret;
1111
1112         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1113         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1114                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1115
1116         ret = rc80211_minstrel_init();
1117         if (ret)
1118                 return ret;
1119
1120         ret = rc80211_minstrel_ht_init();
1121         if (ret)
1122                 goto err_minstrel;
1123
1124         ret = rc80211_pid_init();
1125         if (ret)
1126                 goto err_pid;
1127
1128         ret = ieee80211_iface_init();
1129         if (ret)
1130                 goto err_netdev;
1131
1132         return 0;
1133  err_netdev:
1134         rc80211_pid_exit();
1135  err_pid:
1136         rc80211_minstrel_ht_exit();
1137  err_minstrel:
1138         rc80211_minstrel_exit();
1139
1140         return ret;
1141 }
1142
1143 static void __exit ieee80211_exit(void)
1144 {
1145         rc80211_pid_exit();
1146         rc80211_minstrel_ht_exit();
1147         rc80211_minstrel_exit();
1148
1149         ieee80211s_stop();
1150
1151         ieee80211_iface_exit();
1152
1153         rcu_barrier();
1154 }
1155
1156
1157 subsys_initcall(ieee80211_init);
1158 module_exit(ieee80211_exit);
1159
1160 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1161 MODULE_LICENSE("GPL");