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 static struct lock_class_key ieee80211_rx_skb_queue_class;
  38
  39 void ieee80211_configure_filter(struct ieee80211_local *local)
  40 {
  41         u64 mc;
  42         unsigned int changed_flags;
  43         unsigned int new_flags = 0;
  44
  45         if (atomic_read(&local->iff_promiscs))
  46                 new_flags |= FIF_PROMISC_IN_BSS;
  47
  48         if (atomic_read(&local->iff_allmultis))
  49                 new_flags |= FIF_ALLMULTI;
  50
  51         if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning) ||
  52             test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning))
  53                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  54
  55         if (local->fif_probe_req || local->probe_req_reg)
  56                 new_flags |= FIF_PROBE_REQ;
  57
  58         if (local->fif_fcsfail)
  59                 new_flags |= FIF_FCSFAIL;
  60
  61         if (local->fif_plcpfail)
  62                 new_flags |= FIF_PLCPFAIL;
  63
  64         if (local->fif_control)
  65                 new_flags |= FIF_CONTROL;
  66
  67         if (local->fif_other_bss)
  68                 new_flags |= FIF_OTHER_BSS;
  69
  70         if (local->fif_pspoll)
  71                 new_flags |= FIF_PSPOLL;
  72
  73         spin_lock_bh(&local->filter_lock);
  74         changed_flags = local->filter_flags ^ new_flags;
  75
  76         mc = drv_prepare_multicast(local, &local->mc_list);
  77         spin_unlock_bh(&local->filter_lock);
  78
  79         /* be a bit nasty */
  80         new_flags |= (1<<31);
  81
  82         drv_configure_filter(local, changed_flags, &new_flags, mc);
  83
  84         WARN_ON(new_flags & (1<<31));
  85
  86         local->filter_flags = new_flags & ~(1<<31);
  87 }
  88
  89 static void ieee80211_reconfig_filter(struct work_struct *work)
  90 {
  91         struct ieee80211_local *local =
  92                 container_of(work, struct ieee80211_local, reconfig_filter);
  93
  94         ieee80211_configure_filter(local);
  95 }
  96
  97 static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
  98 {
  99         struct ieee80211_sub_if_data *sdata;
 100         struct ieee80211_channel *chan;
 101         u32 changed = 0;
 102         int power;
 103         enum nl80211_channel_type channel_type;
 104         u32 offchannel_flag;
 105         bool scanning = false;
 106
 107         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 108         if (local->scan_channel) {
 109                 chan = local->scan_channel;
 110                 /* If scanning on oper channel, use whatever channel-type
 111                  * is currently in use.
 112                  */
 113                 if (chan == local->_oper_channel)
 114                         channel_type = local->_oper_channel_type;
 115                 else
 116                         channel_type = NL80211_CHAN_NO_HT;
 117         } else if (local->tmp_channel) {
 118                 chan = local->tmp_channel;
 119                 channel_type = NL80211_CHAN_NO_HT;
 120         } else {
 121                 chan = local->_oper_channel;
 122                 channel_type = local->_oper_channel_type;
 123         }
 124
 125         if (chan != local->_oper_channel ||
 126             channel_type != local->_oper_channel_type)
 127                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 128         else
 129                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 130
 131         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 132
 133         if (offchannel_flag || chan != local->hw.conf.channel ||
 134             channel_type != local->hw.conf.channel_type) {
 135                 local->hw.conf.channel = chan;
 136                 local->hw.conf.channel_type = channel_type;
 137                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 138         }
 139
 140         if (!conf_is_ht(&local->hw.conf)) {
 141                 /*
 142                  * mac80211.h documents that this is only valid
 143                  * when the channel is set to an HT type, and
 144                  * that otherwise STATIC is used.
 145                  */
 146                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 147         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 148                 local->hw.conf.smps_mode = local->smps_mode;
 149                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 150         }
 151
 152         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 153                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning) ||
 154                    test_bit(SCAN_HW_SCANNING, &local->scanning);
 155         power = chan->max_power;
 156
 157         rcu_read_lock();
 158         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 159                 if (!rcu_access_pointer(sdata->vif.chanctx_conf))
 160                         continue;
 161                 power = min(power, sdata->vif.bss_conf.txpower);
 162         }
 163         rcu_read_unlock();
 164
 165         if (local->hw.conf.power_level != power) {
 166                 changed |= IEEE80211_CONF_CHANGE_POWER;
 167                 local->hw.conf.power_level = power;
 168         }
 169
 170         return changed;
 171 }
 172
 173 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 174 {
 175         int ret = 0;
 176
 177         might_sleep();
 178
 179         if (!local->use_chanctx)
 180                 changed |= ieee80211_hw_conf_chan(local);
 181         else
 182                 changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL |
 183                              IEEE80211_CONF_CHANGE_POWER);
 184
 185         if (changed && local->open_count) {
 186                 ret = drv_config(local, changed);
 187                 /*
 188                  * Goal:
 189                  * HW reconfiguration should never fail, the driver has told
 190                  * us what it can support so it should live up to that promise.
 191                  *
 192                  * Current status:
 193                  * rfkill is not integrated with mac80211 and a
 194                  * configuration command can thus fail if hardware rfkill
 195                  * is enabled
 196                  *
 197                  * FIXME: integrate rfkill with mac80211 and then add this
 198                  * WARN_ON() back
 199                  *
 200                  */
 201                 /* WARN_ON(ret); */
 202         }
 203
 204         return ret;
 205 }
 206
 207 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 208                                       u32 changed)
 209 {
 210         struct ieee80211_local *local = sdata->local;
 211
 212         if (!changed)
 213                 return;
 214
 215         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 216 }
 217
 218 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 219 {
 220         sdata->vif.bss_conf.use_cts_prot = false;
 221         sdata->vif.bss_conf.use_short_preamble = false;
 222         sdata->vif.bss_conf.use_short_slot = false;
 223         return BSS_CHANGED_ERP_CTS_PROT |
 224                BSS_CHANGED_ERP_PREAMBLE |
 225                BSS_CHANGED_ERP_SLOT;
 226 }
 227
 228 static void ieee80211_tasklet_handler(unsigned long data)
 229 {
 230         struct ieee80211_local *local = (struct ieee80211_local *) data;
 231         struct sta_info *sta, *tmp;
 232         struct skb_eosp_msg_data *eosp_data;
 233         struct sk_buff *skb;
 234
 235         while ((skb = skb_dequeue(&local->skb_queue)) ||
 236                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 237                 switch (skb->pkt_type) {
 238                 case IEEE80211_RX_MSG:
 239                         /* Clear skb->pkt_type in order to not confuse kernel
 240                          * netstack. */
 241                         skb->pkt_type = 0;
 242                         ieee80211_rx(&local->hw, skb);
 243                         break;
 244                 case IEEE80211_TX_STATUS_MSG:
 245                         skb->pkt_type = 0;
 246                         ieee80211_tx_status(&local->hw, skb);
 247                         break;
 248                 case IEEE80211_EOSP_MSG:
 249                         eosp_data = (void *)skb->cb;
 250                         for_each_sta_info(local, eosp_data->sta, sta, tmp) {
 251                                 /* skip wrong virtual interface */
 252                                 if (memcmp(eosp_data->iface,
 253                                            sta->sdata->vif.addr, ETH_ALEN))
 254                                         continue;
 255                                 clear_sta_flag(sta, WLAN_STA_SP);
 256                                 break;
 257                         }
 258                         dev_kfree_skb(skb);
 259                         break;
 260                 default:
 261                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 262                              skb->pkt_type);
 263                         dev_kfree_skb(skb);
 264                         break;
 265                 }
 266         }
 267 }
 268
 269 static void ieee80211_restart_work(struct work_struct *work)
 270 {
 271         struct ieee80211_local *local =
 272                 container_of(work, struct ieee80211_local, restart_work);
 273
 274         /* wait for scan work complete */
 275         flush_workqueue(local->workqueue);
 276
 277         mutex_lock(&local->mtx);
 278         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
 279              rcu_dereference_protected(local->sched_scan_sdata,
 280                                        lockdep_is_held(&local->mtx)),
 281                 "%s called with hardware scan in progress\n", __func__);
 282         mutex_unlock(&local->mtx);
 283
 284         rtnl_lock();
 285         ieee80211_scan_cancel(local);
 286         ieee80211_reconfig(local);
 287         rtnl_unlock();
 288 }
 289
 290 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 291 {
 292         struct ieee80211_local *local = hw_to_local(hw);
 293
 294         trace_api_restart_hw(local);
 295
 296         wiphy_info(hw->wiphy,
 297                    "Hardware restart was requested\n");
 298
 299         /* use this reason, ieee80211_reconfig will unblock it */
 300         ieee80211_stop_queues_by_reason(hw,
 301                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 302
 303         /*
 304          * Stop all Rx during the reconfig. We don't want state changes
 305          * or driver callbacks while this is in progress.
 306          */
 307         local->in_reconfig = true;
 308         barrier();
 309
 310         schedule_work(&local->restart_work);
 311 }
 312 EXPORT_SYMBOL(ieee80211_restart_hw);
 313
 314 #ifdef CONFIG_INET
 315 static int ieee80211_ifa_changed(struct notifier_block *nb,
 316                                  unsigned long data, void *arg)
 317 {
 318         struct in_ifaddr *ifa = arg;
 319         struct ieee80211_local *local =
 320                 container_of(nb, struct ieee80211_local,
 321                              ifa_notifier);
 322         struct net_device *ndev = ifa->ifa_dev->dev;
 323         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 324         struct in_device *idev;
 325         struct ieee80211_sub_if_data *sdata;
 326         struct ieee80211_bss_conf *bss_conf;
 327         struct ieee80211_if_managed *ifmgd;
 328         int c = 0;
 329
 330         /* Make sure it's our interface that got changed */
 331         if (!wdev)
 332                 return NOTIFY_DONE;
 333
 334         if (wdev->wiphy != local->hw.wiphy)
 335                 return NOTIFY_DONE;
 336
 337         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 338         bss_conf = &sdata->vif.bss_conf;
 339
 340         /* ARP filtering is only supported in managed mode */
 341         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 342                 return NOTIFY_DONE;
 343
 344         idev = __in_dev_get_rtnl(sdata->dev);
 345         if (!idev)
 346                 return NOTIFY_DONE;
 347
 348         ifmgd = &sdata->u.mgd;
 349         mutex_lock(&ifmgd->mtx);
 350
 351         /* Copy the addresses to the bss_conf list */
 352         ifa = idev->ifa_list;
 353         while (ifa) {
 354                 if (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN)
 355                         bss_conf->arp_addr_list[c] = ifa->ifa_address;
 356                 ifa = ifa->ifa_next;
 357                 c++;
 358         }
 359
 360         bss_conf->arp_addr_cnt = c;
 361
 362         /* Configure driver only if associated (which also implies it is up) */
 363         if (ifmgd->associated)
 364                 ieee80211_bss_info_change_notify(sdata,
 365                                                  BSS_CHANGED_ARP_FILTER);
 366
 367         mutex_unlock(&ifmgd->mtx);
 368
 369         return NOTIFY_DONE;
 370 }
 371 #endif
 372
 373 #if IS_ENABLED(CONFIG_IPV6)
 374 static int ieee80211_ifa6_changed(struct notifier_block *nb,
 375                                   unsigned long data, void *arg)
 376 {
 377         struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)arg;
 378         struct inet6_dev *idev = ifa->idev;
 379         struct net_device *ndev = ifa->idev->dev;
 380         struct ieee80211_local *local =
 381                 container_of(nb, struct ieee80211_local, ifa6_notifier);
 382         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 383         struct ieee80211_sub_if_data *sdata;
 384
 385         /* Make sure it's our interface that got changed */
 386         if (!wdev || wdev->wiphy != local->hw.wiphy)
 387                 return NOTIFY_DONE;
 388
 389         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 390
 391         /*
 392          * For now only support station mode. This is mostly because
 393          * doing AP would have to handle AP_VLAN in some way ...
 394          */
 395         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 396                 return NOTIFY_DONE;
 397
 398         drv_ipv6_addr_change(local, sdata, idev);
 399
 400         return NOTIFY_DONE;
 401 }
 402 #endif
 403
 404 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
 405 {
 406         struct ieee80211_local *local =
 407                 container_of(napi, struct ieee80211_local, napi);
 408
 409         return local->ops->napi_poll(&local->hw, budget);
 410 }
 411
 412 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
 413 {
 414         struct ieee80211_local *local = hw_to_local(hw);
 415
 416         napi_schedule(&local->napi);
 417 }
 418 EXPORT_SYMBOL(ieee80211_napi_schedule);
 419
 420 void ieee80211_napi_complete(struct ieee80211_hw *hw)
 421 {
 422         struct ieee80211_local *local = hw_to_local(hw);
 423
 424         napi_complete(&local->napi);
 425 }
 426 EXPORT_SYMBOL(ieee80211_napi_complete);
 427
 428 /* There isn't a lot of sense in it, but you can transmit anything you like */
 429 static const struct ieee80211_txrx_stypes
 430 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 431         [NL80211_IFTYPE_ADHOC] = {
 432                 .tx = 0xffff,
 433                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 434                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 435                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 436                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 437         },
 438         [NL80211_IFTYPE_STATION] = {
 439                 .tx = 0xffff,
 440                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 441                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 442         },
 443         [NL80211_IFTYPE_AP] = {
 444                 .tx = 0xffff,
 445                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 446                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 447                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 448                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 449                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 450                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 451                         BIT(IEEE80211_STYPE_ACTION >> 4),
 452         },
 453         [NL80211_IFTYPE_AP_VLAN] = {
 454                 /* copy AP */
 455                 .tx = 0xffff,
 456                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 457                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 458                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 459                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 460                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 461                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 462                         BIT(IEEE80211_STYPE_ACTION >> 4),
 463         },
 464         [NL80211_IFTYPE_P2P_CLIENT] = {
 465                 .tx = 0xffff,
 466                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 467                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 468         },
 469         [NL80211_IFTYPE_P2P_GO] = {
 470                 .tx = 0xffff,
 471                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 472                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 473                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 474                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 475                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 476                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 477                         BIT(IEEE80211_STYPE_ACTION >> 4),
 478         },
 479         [NL80211_IFTYPE_MESH_POINT] = {
 480                 .tx = 0xffff,
 481                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 482                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 483                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 484         },
 485         [NL80211_IFTYPE_P2P_DEVICE] = {
 486                 .tx = 0xffff,
 487                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 488                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 489         },
 490 };
 491
 492 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
 493         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
 494                              IEEE80211_HT_AMPDU_PARM_DENSITY,
 495
 496         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 497                                 IEEE80211_HT_CAP_MAX_AMSDU |
 498                                 IEEE80211_HT_CAP_SGI_20 |
 499                                 IEEE80211_HT_CAP_SGI_40),
 500         .mcs = {
 501                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
 502                              0xff, 0xff, 0xff, 0xff, 0xff, },
 503         },
 504 };
 505
 506 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 507                                         const struct ieee80211_ops *ops)
 508 {
 509         struct ieee80211_local *local;
 510         int priv_size, i;
 511         struct wiphy *wiphy;
 512         bool use_chanctx;
 513
 514         if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
 515                     !ops->add_interface || !ops->remove_interface ||
 516                     !ops->configure_filter))
 517                 return NULL;
 518
 519         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
 520                 return NULL;
 521
 522         /* check all or no channel context operations exist */
 523         i = !!ops->add_chanctx + !!ops->remove_chanctx +
 524             !!ops->change_chanctx + !!ops->assign_vif_chanctx +
 525             !!ops->unassign_vif_chanctx;
 526         if (WARN_ON(i != 0 && i != 5))
 527                 return NULL;
 528         use_chanctx = i == 5;
 529
 530         /* Ensure 32-byte alignment of our private data and hw private data.
 531          * We use the wiphy priv data for both our ieee80211_local and for
 532          * the driver's private data
 533          *
 534          * In memory it'll be like this:
 535          *
 536          * +-------------------------+
 537          * | struct wiphy           |
 538          * +-------------------------+
 539          * | struct ieee80211_local  |
 540          * +-------------------------+
 541          * | driver's private data   |
 542          * +-------------------------+
 543          *
 544          */
 545         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 546
 547         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 548
 549         if (!wiphy)
 550                 return NULL;
 551
 552         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 553
 554         wiphy->privid = mac80211_wiphy_privid;
 555
 556         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 557                         WIPHY_FLAG_4ADDR_AP |
 558                         WIPHY_FLAG_4ADDR_STATION |
 559                         WIPHY_FLAG_REPORTS_OBSS |
 560                         WIPHY_FLAG_OFFCHAN_TX;
 561
 562         if (ops->remain_on_channel)
 563                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 564
 565         wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
 566                            NL80211_FEATURE_SAE |
 567                            NL80211_FEATURE_HT_IBSS |
 568                            NL80211_FEATURE_VIF_TXPOWER |
 569                            NL80211_FEATURE_FULL_AP_CLIENT_STATE;
 570
 571         if (!ops->hw_scan)
 572                 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
 573                                    NL80211_FEATURE_AP_SCAN;
 574
 575
 576         if (!ops->set_key)
 577                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 578
 579         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 580
 581         local = wiphy_priv(wiphy);
 582
 583         local->hw.wiphy = wiphy;
 584
 585         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 586
 587         local->ops = ops;
 588         local->use_chanctx = use_chanctx;
 589
 590         /* set up some defaults */
 591         local->hw.queues = 1;
 592         local->hw.max_rates = 1;
 593         local->hw.max_report_rates = 0;
 594         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 595         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 596         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
 597         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 598         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 599         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 600                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 601                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 602         local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 603                                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 604         local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
 605         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
 606
 607         INIT_LIST_HEAD(&local->interfaces);
 608
 609         __hw_addr_init(&local->mc_list);
 610
 611         mutex_init(&local->iflist_mtx);
 612         mutex_init(&local->mtx);
 613
 614         mutex_init(&local->key_mtx);
 615         spin_lock_init(&local->filter_lock);
 616         spin_lock_init(&local->queue_stop_reason_lock);
 617
 618         INIT_LIST_HEAD(&local->chanctx_list);
 619         mutex_init(&local->chanctx_mtx);
 620
 621         /*
 622          * The rx_skb_queue is only accessed from tasklets,
 623          * but other SKB queues are used from within IRQ
 624          * context. Therefore, this one needs a different
 625          * locking class so our direct, non-irq-safe use of
 626          * the queue's lock doesn't throw lockdep warnings.
 627          */
 628         skb_queue_head_init_class(&local->rx_skb_queue,
 629                                   &ieee80211_rx_skb_queue_class);
 630
 631         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 632
 633         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 634
 635         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 636         local->smps_mode = IEEE80211_SMPS_OFF;
 637
 638         INIT_WORK(&local->dynamic_ps_enable_work,
 639                   ieee80211_dynamic_ps_enable_work);
 640         INIT_WORK(&local->dynamic_ps_disable_work,
 641                   ieee80211_dynamic_ps_disable_work);
 642         setup_timer(&local->dynamic_ps_timer,
 643                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 644
 645         INIT_WORK(&local->sched_scan_stopped_work,
 646                   ieee80211_sched_scan_stopped_work);
 647
 648         spin_lock_init(&local->ack_status_lock);
 649         idr_init(&local->ack_status_frames);
 650         /* preallocate at least one entry */
 651         idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
 652
 653         sta_info_init(local);
 654
 655         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 656                 skb_queue_head_init(&local->pending[i]);
 657                 atomic_set(&local->agg_queue_stop[i], 0);
 658         }
 659         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 660                      (unsigned long)local);
 661
 662         tasklet_init(&local->tasklet,
 663                      ieee80211_tasklet_handler,
 664                      (unsigned long) local);
 665
 666         skb_queue_head_init(&local->skb_queue);
 667         skb_queue_head_init(&local->skb_queue_unreliable);
 668
 669         /* init dummy netdev for use w/ NAPI */
 670         init_dummy_netdev(&local->napi_dev);
 671
 672         ieee80211_led_names(local);
 673
 674         ieee80211_roc_setup(local);
 675
 676         return &local->hw;
 677 }
 678 EXPORT_SYMBOL(ieee80211_alloc_hw);
 679
 680 int ieee80211_register_hw(struct ieee80211_hw *hw)
 681 {
 682         struct ieee80211_local *local = hw_to_local(hw);
 683         int result, i;
 684         enum ieee80211_band band;
 685         int channels, max_bitrates;
 686         bool supp_ht, supp_vht;
 687         netdev_features_t feature_whitelist;
 688         static const u32 cipher_suites[] = {
 689                 /* keep WEP first, it may be removed below */
 690                 WLAN_CIPHER_SUITE_WEP40,
 691                 WLAN_CIPHER_SUITE_WEP104,
 692                 WLAN_CIPHER_SUITE_TKIP,
 693                 WLAN_CIPHER_SUITE_CCMP,
 694
 695                 /* keep last -- depends on hw flags! */
 696                 WLAN_CIPHER_SUITE_AES_CMAC
 697         };
 698
 699         if (hw->flags & IEEE80211_HW_QUEUE_CONTROL &&
 700             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
 701              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
 702                 return -EINVAL;
 703
 704 #ifdef CONFIG_PM
 705         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) &&
 706             (!local->ops->suspend || !local->ops->resume))
 707                 return -EINVAL;
 708 #endif
 709
 710         if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan)
 711                 return -EINVAL;
 712
 713         if (!local->use_chanctx) {
 714                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 715                         const struct ieee80211_iface_combination *comb;
 716
 717                         comb = &local->hw.wiphy->iface_combinations[i];
 718
 719                         if (comb->num_different_channels > 1)
 720                                 return -EINVAL;
 721                 }
 722         } else {
 723                 /*
 724                  * WDS is currently prohibited when channel contexts are used
 725                  * because there's no clear definition of which channel WDS
 726                  * type interfaces use
 727                  */
 728                 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))
 729                         return -EINVAL;
 730         }
 731
 732         /* Only HW csum features are currently compatible with mac80211 */
 733         feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 734                             NETIF_F_HW_CSUM;
 735         if (WARN_ON(hw->netdev_features & ~feature_whitelist))
 736                 return -EINVAL;
 737
 738         if (hw->max_report_rates == 0)
 739                 hw->max_report_rates = hw->max_rates;
 740
 741         local->rx_chains = 1;
 742
 743         /*
 744          * generic code guarantees at least one band,
 745          * set this very early because much code assumes
 746          * that hw.conf.channel is assigned
 747          */
 748         channels = 0;
 749         max_bitrates = 0;
 750         supp_ht = false;
 751         supp_vht = false;
 752         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 753                 struct ieee80211_supported_band *sband;
 754
 755                 sband = local->hw.wiphy->bands[band];
 756                 if (!sband)
 757                         continue;
 758                 if (!local->use_chanctx && !local->_oper_channel) {
 759                         /* init channel we're on */
 760                         local->hw.conf.channel =
 761                         local->_oper_channel = &sband->channels[0];
 762                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 763                 }
 764                 cfg80211_chandef_create(&local->monitor_chandef,
 765                                         &sband->channels[0],
 766                                         NL80211_CHAN_NO_HT);
 767                 channels += sband->n_channels;
 768
 769                 if (max_bitrates < sband->n_bitrates)
 770                         max_bitrates = sband->n_bitrates;
 771                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 772                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
 773
 774                 if (sband->ht_cap.ht_supported)
 775                         local->rx_chains =
 776                                 max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
 777                                     local->rx_chains);
 778
 779                 /* TODO: consider VHT for RX chains, hopefully it's the same */
 780         }
 781
 782         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 783                                       sizeof(void *) * channels, GFP_KERNEL);
 784         if (!local->int_scan_req)
 785                 return -ENOMEM;
 786
 787         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 788                 if (!local->hw.wiphy->bands[band])
 789                         continue;
 790                 local->int_scan_req->rates[band] = (u32) -1;
 791         }
 792
 793         /* if low-level driver supports AP, we also support VLAN */
 794         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
 795                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 796                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 797         }
 798
 799         /* mac80211 always supports monitor */
 800         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 801         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 802
 803         /* mac80211 doesn't support more than one IBSS interface right now */
 804         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 805                 const struct ieee80211_iface_combination *c;
 806                 int j;
 807
 808                 c = &hw->wiphy->iface_combinations[i];
 809
 810                 for (j = 0; j < c->n_limits; j++)
 811                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 812                             c->limits[j].max > 1)
 813                                 return -EINVAL;
 814         }
 815
 816 #ifndef CONFIG_MAC80211_MESH
 817         /* mesh depends on Kconfig, but drivers should set it if they want */
 818         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 819 #endif
 820
 821         /* if the underlying driver supports mesh, mac80211 will (at least)
 822          * provide routing of mesh authentication frames to userspace */
 823         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 824                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 825
 826         /* mac80211 supports control port protocol changing */
 827         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 828
 829         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 830                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 831         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 832                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 833
 834         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 835              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 836              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 837
 838         /*
 839          * Calculate scan IE length -- we need this to alloc
 840          * memory and to subtract from the driver limit. It
 841          * includes the DS Params, (extended) supported rates, and HT
 842          * information -- SSID is the driver's responsibility.
 843          */
 844         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 845                 3 /* DS Params */;
 846         if (supp_ht)
 847                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 848
 849         if (supp_vht) {
 850                 local->scan_ies_len +=
 851                         2 + sizeof(struct ieee80211_vht_cap);
 852
 853                 /*
 854                  * (for now at least), drivers wanting to use VHT must
 855                  * support channel contexts, as they contain all the
 856                  * necessary VHT information and the global hw config
 857                  * doesn't (yet)
 858                  */
 859                 if (WARN_ON(!local->use_chanctx)) {
 860                         result = -EINVAL;
 861                         goto fail_wiphy_register;
 862                 }
 863         }
 864
 865         if (!local->ops->hw_scan) {
 866                 /* For hw_scan, driver needs to set these up. */
 867                 local->hw.wiphy->max_scan_ssids = 4;
 868                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 869         }
 870
 871         /*
 872          * If the driver supports any scan IEs, then assume the
 873          * limit includes the IEs mac80211 will add, otherwise
 874          * leave it at zero and let the driver sort it out; we
 875          * still pass our IEs to the driver but userspace will
 876          * not be allowed to in that case.
 877          */
 878         if (local->hw.wiphy->max_scan_ie_len)
 879                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 880
 881         /* Set up cipher suites unless driver already did */
 882         if (!local->hw.wiphy->cipher_suites) {
 883                 local->hw.wiphy->cipher_suites = cipher_suites;
 884                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 885                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 886                         local->hw.wiphy->n_cipher_suites--;
 887         }
 888         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 889                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 890                         local->hw.wiphy->cipher_suites += 2;
 891                         local->hw.wiphy->n_cipher_suites -= 2;
 892                 } else {
 893                         u32 *suites;
 894                         int r, w = 0;
 895
 896                         /* Filter out WEP */
 897
 898                         suites = kmemdup(
 899                                 local->hw.wiphy->cipher_suites,
 900                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 901                                 GFP_KERNEL);
 902                         if (!suites) {
 903                                 result = -ENOMEM;
 904                                 goto fail_wiphy_register;
 905                         }
 906                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 907                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 908                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 909                                     suite == WLAN_CIPHER_SUITE_WEP104)
 910                                         continue;
 911                                 suites[w++] = suite;
 912                         }
 913                         local->hw.wiphy->cipher_suites = suites;
 914                         local->hw.wiphy->n_cipher_suites = w;
 915                         local->wiphy_ciphers_allocated = true;
 916                 }
 917         }
 918
 919         if (!local->ops->remain_on_channel)
 920                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
 921
 922         if (local->ops->sched_scan_start)
 923                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
 924
 925         /* mac80211 based drivers don't support internal TDLS setup */
 926         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
 927                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
 928
 929         result = wiphy_register(local->hw.wiphy);
 930         if (result < 0)
 931                 goto fail_wiphy_register;
 932
 933         /*
 934          * We use the number of queues for feature tests (QoS, HT) internally
 935          * so restrict them appropriately.
 936          */
 937         if (hw->queues > IEEE80211_MAX_QUEUES)
 938                 hw->queues = IEEE80211_MAX_QUEUES;
 939
 940         local->workqueue =
 941                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
 942         if (!local->workqueue) {
 943                 result = -ENOMEM;
 944                 goto fail_workqueue;
 945         }
 946
 947         /*
 948          * The hardware needs headroom for sending the frame,
 949          * and we need some headroom for passing the frame to monitor
 950          * interfaces, but never both at the same time.
 951          */
 952         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 953                                    IEEE80211_TX_STATUS_HEADROOM);
 954
 955         debugfs_hw_add(local);
 956
 957         /*
 958          * if the driver doesn't specify a max listen interval we
 959          * use 5 which should be a safe default
 960          */
 961         if (local->hw.max_listen_interval == 0)
 962                 local->hw.max_listen_interval = 5;
 963
 964         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 965
 966         local->dynamic_ps_forced_timeout = -1;
 967
 968         result = ieee80211_wep_init(local);
 969         if (result < 0)
 970                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 971                             result);
 972
 973         ieee80211_led_init(local);
 974
 975         rtnl_lock();
 976
 977         result = ieee80211_init_rate_ctrl_alg(local,
 978                                               hw->rate_control_algorithm);
 979         if (result < 0) {
 980                 wiphy_debug(local->hw.wiphy,
 981                             "Failed to initialize rate control algorithm\n");
 982                 goto fail_rate;
 983         }
 984
 985         /* add one default STA interface if supported */
 986         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 987                 result = ieee80211_if_add(local, "wlan%d", NULL,
 988                                           NL80211_IFTYPE_STATION, NULL);
 989                 if (result)
 990                         wiphy_warn(local->hw.wiphy,
 991                                    "Failed to add default virtual iface\n");
 992         }
 993
 994         rtnl_unlock();
 995
 996         local->network_latency_notifier.notifier_call =
 997                 ieee80211_max_network_latency;
 998         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 999                                      &local->network_latency_notifier);
1000         if (result) {
1001                 rtnl_lock();
1002                 goto fail_pm_qos;
1003         }
1004
1005 #ifdef CONFIG_INET
1006         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
1007         result = register_inetaddr_notifier(&local->ifa_notifier);
1008         if (result)
1009                 goto fail_ifa;
1010 #endif
1011
1012 #if IS_ENABLED(CONFIG_IPV6)
1013         local->ifa6_notifier.notifier_call = ieee80211_ifa6_changed;
1014         result = register_inet6addr_notifier(&local->ifa6_notifier);
1015         if (result)
1016                 goto fail_ifa6;
1017 #endif
1018
1019         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
1020                         local->hw.napi_weight);
1021
1022         return 0;
1023
1024 #if IS_ENABLED(CONFIG_IPV6)
1025  fail_ifa6:
1026 #ifdef CONFIG_INET
1027         unregister_inetaddr_notifier(&local->ifa_notifier);
1028 #endif
1029 #endif
1030 #if defined(CONFIG_INET) || defined(CONFIG_IPV6)
1031  fail_ifa:
1032         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1033                                &local->network_latency_notifier);
1034         rtnl_lock();
1035 #endif
1036  fail_pm_qos:
1037         ieee80211_led_exit(local);
1038         ieee80211_remove_interfaces(local);
1039  fail_rate:
1040         rtnl_unlock();
1041         ieee80211_wep_free(local);
1042         sta_info_stop(local);
1043         destroy_workqueue(local->workqueue);
1044  fail_workqueue:
1045         wiphy_unregister(local->hw.wiphy);
1046  fail_wiphy_register:
1047         if (local->wiphy_ciphers_allocated)
1048                 kfree(local->hw.wiphy->cipher_suites);
1049         kfree(local->int_scan_req);
1050         return result;
1051 }
1052 EXPORT_SYMBOL(ieee80211_register_hw);
1053
1054 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1055 {
1056         struct ieee80211_local *local = hw_to_local(hw);
1057
1058         tasklet_kill(&local->tx_pending_tasklet);
1059         tasklet_kill(&local->tasklet);
1060
1061         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1062                                &local->network_latency_notifier);
1063 #ifdef CONFIG_INET
1064         unregister_inetaddr_notifier(&local->ifa_notifier);
1065 #endif
1066 #if IS_ENABLED(CONFIG_IPV6)
1067         unregister_inet6addr_notifier(&local->ifa6_notifier);
1068 #endif
1069
1070         rtnl_lock();
1071
1072         /*
1073          * At this point, interface list manipulations are fine
1074          * because the driver cannot be handing us frames any
1075          * more and the tasklet is killed.
1076          */
1077         ieee80211_remove_interfaces(local);
1078
1079         rtnl_unlock();
1080
1081         cancel_work_sync(&local->restart_work);
1082         cancel_work_sync(&local->reconfig_filter);
1083
1084         ieee80211_clear_tx_pending(local);
1085         rate_control_deinitialize(local);
1086
1087         if (skb_queue_len(&local->skb_queue) ||
1088             skb_queue_len(&local->skb_queue_unreliable))
1089                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1090         skb_queue_purge(&local->skb_queue);
1091         skb_queue_purge(&local->skb_queue_unreliable);
1092         skb_queue_purge(&local->rx_skb_queue);
1093
1094         destroy_workqueue(local->workqueue);
1095         wiphy_unregister(local->hw.wiphy);
1096         sta_info_stop(local);
1097         ieee80211_wep_free(local);
1098         ieee80211_led_exit(local);
1099         kfree(local->int_scan_req);
1100 }
1101 EXPORT_SYMBOL(ieee80211_unregister_hw);
1102
1103 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1104 {
1105         WARN_ONCE(1, "Have pending ack frames!\n");
1106         kfree_skb(p);
1107         return 0;
1108 }
1109
1110 void ieee80211_free_hw(struct ieee80211_hw *hw)
1111 {
1112         struct ieee80211_local *local = hw_to_local(hw);
1113
1114         mutex_destroy(&local->iflist_mtx);
1115         mutex_destroy(&local->mtx);
1116
1117         if (local->wiphy_ciphers_allocated)
1118                 kfree(local->hw.wiphy->cipher_suites);
1119
1120         idr_for_each(&local->ack_status_frames,
1121                      ieee80211_free_ack_frame, NULL);
1122         idr_destroy(&local->ack_status_frames);
1123
1124         wiphy_free(local->hw.wiphy);
1125 }
1126 EXPORT_SYMBOL(ieee80211_free_hw);
1127
1128 static int __init ieee80211_init(void)
1129 {
1130         struct sk_buff *skb;
1131         int ret;
1132
1133         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1134         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1135                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1136
1137         ret = rc80211_minstrel_init();
1138         if (ret)
1139                 return ret;
1140
1141         ret = rc80211_minstrel_ht_init();
1142         if (ret)
1143                 goto err_minstrel;
1144
1145         ret = rc80211_pid_init();
1146         if (ret)
1147                 goto err_pid;
1148
1149         ret = ieee80211_iface_init();
1150         if (ret)
1151                 goto err_netdev;
1152
1153         return 0;
1154  err_netdev:
1155         rc80211_pid_exit();
1156  err_pid:
1157         rc80211_minstrel_ht_exit();
1158  err_minstrel:
1159         rc80211_minstrel_exit();
1160
1161         return ret;
1162 }
1163
1164 static void __exit ieee80211_exit(void)
1165 {
1166         rc80211_pid_exit();
1167         rc80211_minstrel_ht_exit();
1168         rc80211_minstrel_exit();
1169
1170         if (mesh_allocated)
1171                 ieee80211s_stop();
1172
1173         ieee80211_iface_exit();
1174
1175         rcu_barrier();
1176 }
1177
1178
1179 subsys_initcall(ieee80211_init);
1180 module_exit(ieee80211_exit);
1181
1182 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1183 MODULE_LICENSE("GPL");