net/mac80211/main.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <net/mac80211.h>
  12 #include <linux/module.h>
  13 #include <linux/init.h>
  14 #include <linux/netdevice.h>
  15 #include <linux/types.h>
  16 #include <linux/slab.h>
  17 #include <linux/skbuff.h>
  18 #include <linux/etherdevice.h>
  19 #include <linux/if_arp.h>
  20 #include <linux/rtnetlink.h>
  21 #include <linux/bitmap.h>
  22 #include <linux/pm_qos.h>
  23 #include <linux/inetdevice.h>
  24 #include <net/net_namespace.h>
  25 #include <net/cfg80211.h>
  26 #include <net/addrconf.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "rate.h"
  31 #include "mesh.h"
  32 #include "wep.h"
  33 #include "led.h"
  34 #include "cfg.h"
  35 #include "debugfs.h"
  36
  37 void ieee80211_configure_filter(struct ieee80211_local *local)
  38 {
  39         u64 mc;
  40         unsigned int changed_flags;
  41         unsigned int new_flags = 0;
  42
  43         if (atomic_read(&local->iff_promiscs))
  44                 new_flags |= FIF_PROMISC_IN_BSS;
  45
  46         if (atomic_read(&local->iff_allmultis))
  47                 new_flags |= FIF_ALLMULTI;
  48
  49         if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning) ||
  50             test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning))
  51                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  52
  53         if (local->fif_probe_req || local->probe_req_reg)
  54                 new_flags |= FIF_PROBE_REQ;
  55
  56         if (local->fif_fcsfail)
  57                 new_flags |= FIF_FCSFAIL;
  58
  59         if (local->fif_plcpfail)
  60                 new_flags |= FIF_PLCPFAIL;
  61
  62         if (local->fif_control)
  63                 new_flags |= FIF_CONTROL;
  64
  65         if (local->fif_other_bss)
  66                 new_flags |= FIF_OTHER_BSS;
  67
  68         if (local->fif_pspoll)
  69                 new_flags |= FIF_PSPOLL;
  70
  71         spin_lock_bh(&local->filter_lock);
  72         changed_flags = local->filter_flags ^ new_flags;
  73
  74         mc = drv_prepare_multicast(local, &local->mc_list);
  75         spin_unlock_bh(&local->filter_lock);
  76
  77         /* be a bit nasty */
  78         new_flags |= (1<<31);
  79
  80         drv_configure_filter(local, changed_flags, &new_flags, mc);
  81
  82         WARN_ON(new_flags & (1<<31));
  83
  84         local->filter_flags = new_flags & ~(1<<31);
  85 }
  86
  87 static void ieee80211_reconfig_filter(struct work_struct *work)
  88 {
  89         struct ieee80211_local *local =
  90                 container_of(work, struct ieee80211_local, reconfig_filter);
  91
  92         ieee80211_configure_filter(local);
  93 }
  94
  95 static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
  96 {
  97         struct ieee80211_sub_if_data *sdata;
  98         struct ieee80211_channel *chan;
  99         u32 changed = 0;
 100         int power;
 101         enum nl80211_channel_type channel_type;
 102         u32 offchannel_flag;
 103         bool scanning = false;
 104
 105         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 106         if (local->scan_channel) {
 107                 chan = local->scan_channel;
 108                 /* If scanning on oper channel, use whatever channel-type
 109                  * is currently in use.
 110                  */
 111                 if (chan == local->_oper_channel)
 112                         channel_type = local->_oper_channel_type;
 113                 else
 114                         channel_type = NL80211_CHAN_NO_HT;
 115         } else if (local->tmp_channel) {
 116                 chan = local->tmp_channel;
 117                 channel_type = NL80211_CHAN_NO_HT;
 118         } else {
 119                 chan = local->_oper_channel;
 120                 channel_type = local->_oper_channel_type;
 121         }
 122
 123         if (chan != local->_oper_channel ||
 124             channel_type != local->_oper_channel_type)
 125                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 126         else
 127                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 128
 129         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 130
 131         if (offchannel_flag || chan != local->hw.conf.channel ||
 132             channel_type != local->hw.conf.channel_type) {
 133                 local->hw.conf.channel = chan;
 134                 local->hw.conf.channel_type = channel_type;
 135                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 136         }
 137
 138         if (!conf_is_ht(&local->hw.conf)) {
 139                 /*
 140                  * mac80211.h documents that this is only valid
 141                  * when the channel is set to an HT type, and
 142                  * that otherwise STATIC is used.
 143                  */
 144                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 145         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 146                 local->hw.conf.smps_mode = local->smps_mode;
 147                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 148         }
 149
 150         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 151                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning) ||
 152                    test_bit(SCAN_HW_SCANNING, &local->scanning);
 153         power = chan->max_power;
 154
 155         rcu_read_lock();
 156         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 157                 if (!rcu_access_pointer(sdata->vif.chanctx_conf))
 158                         continue;
 159                 power = min(power, sdata->vif.bss_conf.txpower);
 160         }
 161         rcu_read_unlock();
 162
 163         if (local->hw.conf.power_level != power) {
 164                 changed |= IEEE80211_CONF_CHANGE_POWER;
 165                 local->hw.conf.power_level = power;
 166         }
 167
 168         return changed;
 169 }
 170
 171 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 172 {
 173         int ret = 0;
 174
 175         might_sleep();
 176
 177         if (!local->use_chanctx)
 178                 changed |= ieee80211_hw_conf_chan(local);
 179         else
 180                 changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL |
 181                              IEEE80211_CONF_CHANGE_POWER);
 182
 183         if (changed && local->open_count) {
 184                 ret = drv_config(local, changed);
 185                 /*
 186                  * Goal:
 187                  * HW reconfiguration should never fail, the driver has told
 188                  * us what it can support so it should live up to that promise.
 189                  *
 190                  * Current status:
 191                  * rfkill is not integrated with mac80211 and a
 192                  * configuration command can thus fail if hardware rfkill
 193                  * is enabled
 194                  *
 195                  * FIXME: integrate rfkill with mac80211 and then add this
 196                  * WARN_ON() back
 197                  *
 198                  */
 199                 /* WARN_ON(ret); */
 200         }
 201
 202         return ret;
 203 }
 204
 205 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 206                                       u32 changed)
 207 {
 208         struct ieee80211_local *local = sdata->local;
 209
 210         if (!changed)
 211                 return;
 212
 213         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 214 }
 215
 216 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 217 {
 218         sdata->vif.bss_conf.use_cts_prot = false;
 219         sdata->vif.bss_conf.use_short_preamble = false;
 220         sdata->vif.bss_conf.use_short_slot = false;
 221         return BSS_CHANGED_ERP_CTS_PROT |
 222                BSS_CHANGED_ERP_PREAMBLE |
 223                BSS_CHANGED_ERP_SLOT;
 224 }
 225
 226 static void ieee80211_tasklet_handler(unsigned long data)
 227 {
 228         struct ieee80211_local *local = (struct ieee80211_local *) data;
 229         struct sk_buff *skb;
 230
 231         while ((skb = skb_dequeue(&local->skb_queue)) ||
 232                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 233                 switch (skb->pkt_type) {
 234                 case IEEE80211_RX_MSG:
 235                         /* Clear skb->pkt_type in order to not confuse kernel
 236                          * netstack. */
 237                         skb->pkt_type = 0;
 238                         ieee80211_rx(&local->hw, skb);
 239                         break;
 240                 case IEEE80211_TX_STATUS_MSG:
 241                         skb->pkt_type = 0;
 242                         ieee80211_tx_status(&local->hw, skb);
 243                         break;
 244                 default:
 245                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 246                              skb->pkt_type);
 247                         dev_kfree_skb(skb);
 248                         break;
 249                 }
 250         }
 251 }
 252
 253 static void ieee80211_restart_work(struct work_struct *work)
 254 {
 255         struct ieee80211_local *local =
 256                 container_of(work, struct ieee80211_local, restart_work);
 257
 258         /* wait for scan work complete */
 259         flush_workqueue(local->workqueue);
 260
 261         mutex_lock(&local->mtx);
 262         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
 263              rcu_dereference_protected(local->sched_scan_sdata,
 264                                        lockdep_is_held(&local->mtx)),
 265                 "%s called with hardware scan in progress\n", __func__);
 266         mutex_unlock(&local->mtx);
 267
 268         rtnl_lock();
 269         ieee80211_scan_cancel(local);
 270         ieee80211_reconfig(local);
 271         rtnl_unlock();
 272 }
 273
 274 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 275 {
 276         struct ieee80211_local *local = hw_to_local(hw);
 277
 278         trace_api_restart_hw(local);
 279
 280         wiphy_info(hw->wiphy,
 281                    "Hardware restart was requested\n");
 282
 283         /* use this reason, ieee80211_reconfig will unblock it */
 284         ieee80211_stop_queues_by_reason(hw,
 285                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 286
 287         /*
 288          * Stop all Rx during the reconfig. We don't want state changes
 289          * or driver callbacks while this is in progress.
 290          */
 291         local->in_reconfig = true;
 292         barrier();
 293
 294         schedule_work(&local->restart_work);
 295 }
 296 EXPORT_SYMBOL(ieee80211_restart_hw);
 297
 298 #ifdef CONFIG_INET
 299 static int ieee80211_ifa_changed(struct notifier_block *nb,
 300                                  unsigned long data, void *arg)
 301 {
 302         struct in_ifaddr *ifa = arg;
 303         struct ieee80211_local *local =
 304                 container_of(nb, struct ieee80211_local,
 305                              ifa_notifier);
 306         struct net_device *ndev = ifa->ifa_dev->dev;
 307         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 308         struct in_device *idev;
 309         struct ieee80211_sub_if_data *sdata;
 310         struct ieee80211_bss_conf *bss_conf;
 311         struct ieee80211_if_managed *ifmgd;
 312         int c = 0;
 313
 314         /* Make sure it's our interface that got changed */
 315         if (!wdev)
 316                 return NOTIFY_DONE;
 317
 318         if (wdev->wiphy != local->hw.wiphy)
 319                 return NOTIFY_DONE;
 320
 321         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 322         bss_conf = &sdata->vif.bss_conf;
 323
 324         /* ARP filtering is only supported in managed mode */
 325         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 326                 return NOTIFY_DONE;
 327
 328         idev = __in_dev_get_rtnl(sdata->dev);
 329         if (!idev)
 330                 return NOTIFY_DONE;
 331
 332         ifmgd = &sdata->u.mgd;
 333         mutex_lock(&ifmgd->mtx);
 334
 335         /* Copy the addresses to the bss_conf list */
 336         ifa = idev->ifa_list;
 337         while (ifa) {
 338                 if (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN)
 339                         bss_conf->arp_addr_list[c] = ifa->ifa_address;
 340                 ifa = ifa->ifa_next;
 341                 c++;
 342         }
 343
 344         bss_conf->arp_addr_cnt = c;
 345
 346         /* Configure driver only if associated (which also implies it is up) */
 347         if (ifmgd->associated)
 348                 ieee80211_bss_info_change_notify(sdata,
 349                                                  BSS_CHANGED_ARP_FILTER);
 350
 351         mutex_unlock(&ifmgd->mtx);
 352
 353         return NOTIFY_DONE;
 354 }
 355 #endif
 356
 357 #if IS_ENABLED(CONFIG_IPV6)
 358 static int ieee80211_ifa6_changed(struct notifier_block *nb,
 359                                   unsigned long data, void *arg)
 360 {
 361         struct inet6_ifaddr *ifa = (struct inet6_ifaddr *)arg;
 362         struct inet6_dev *idev = ifa->idev;
 363         struct net_device *ndev = ifa->idev->dev;
 364         struct ieee80211_local *local =
 365                 container_of(nb, struct ieee80211_local, ifa6_notifier);
 366         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 367         struct ieee80211_sub_if_data *sdata;
 368
 369         /* Make sure it's our interface that got changed */
 370         if (!wdev || wdev->wiphy != local->hw.wiphy)
 371                 return NOTIFY_DONE;
 372
 373         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 374
 375         /*
 376          * For now only support station mode. This is mostly because
 377          * doing AP would have to handle AP_VLAN in some way ...
 378          */
 379         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 380                 return NOTIFY_DONE;
 381
 382         drv_ipv6_addr_change(local, sdata, idev);
 383
 384         return NOTIFY_DONE;
 385 }
 386 #endif
 387
 388 /* There isn't a lot of sense in it, but you can transmit anything you like */
 389 static const struct ieee80211_txrx_stypes
 390 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 391         [NL80211_IFTYPE_ADHOC] = {
 392                 .tx = 0xffff,
 393                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 394                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 395                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 396                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 397         },
 398         [NL80211_IFTYPE_STATION] = {
 399                 .tx = 0xffff,
 400                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 401                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 402         },
 403         [NL80211_IFTYPE_AP] = {
 404                 .tx = 0xffff,
 405                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 406                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 407                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 408                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 409                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 410                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 411                         BIT(IEEE80211_STYPE_ACTION >> 4),
 412         },
 413         [NL80211_IFTYPE_AP_VLAN] = {
 414                 /* copy AP */
 415                 .tx = 0xffff,
 416                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 417                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 418                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 419                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 420                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 421                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 422                         BIT(IEEE80211_STYPE_ACTION >> 4),
 423         },
 424         [NL80211_IFTYPE_P2P_CLIENT] = {
 425                 .tx = 0xffff,
 426                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 427                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 428         },
 429         [NL80211_IFTYPE_P2P_GO] = {
 430                 .tx = 0xffff,
 431                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 432                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 433                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 434                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 435                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 436                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 437                         BIT(IEEE80211_STYPE_ACTION >> 4),
 438         },
 439         [NL80211_IFTYPE_MESH_POINT] = {
 440                 .tx = 0xffff,
 441                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 442                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 443                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 444         },
 445         [NL80211_IFTYPE_P2P_DEVICE] = {
 446                 .tx = 0xffff,
 447                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 448                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 449         },
 450 };
 451
 452 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
 453         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
 454                              IEEE80211_HT_AMPDU_PARM_DENSITY,
 455
 456         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 457                                 IEEE80211_HT_CAP_MAX_AMSDU |
 458                                 IEEE80211_HT_CAP_SGI_20 |
 459                                 IEEE80211_HT_CAP_SGI_40),
 460         .mcs = {
 461                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
 462                              0xff, 0xff, 0xff, 0xff, 0xff, },
 463         },
 464 };
 465
 466 static const struct ieee80211_vht_cap mac80211_vht_capa_mod_mask = {
 467         .vht_cap_info =
 468                 cpu_to_le32(IEEE80211_VHT_CAP_RXLDPC |
 469                             IEEE80211_VHT_CAP_SHORT_GI_80 |
 470                             IEEE80211_VHT_CAP_SHORT_GI_160 |
 471                             IEEE80211_VHT_CAP_RXSTBC_1 |
 472                             IEEE80211_VHT_CAP_RXSTBC_2 |
 473                             IEEE80211_VHT_CAP_RXSTBC_3 |
 474                             IEEE80211_VHT_CAP_RXSTBC_4 |
 475                             IEEE80211_VHT_CAP_TXSTBC |
 476                             IEEE80211_VHT_CAP_SU_BEAMFORMER_CAPABLE |
 477                             IEEE80211_VHT_CAP_SU_BEAMFORMEE_CAPABLE |
 478                             IEEE80211_VHT_CAP_TX_ANTENNA_PATTERN |
 479                             IEEE80211_VHT_CAP_RX_ANTENNA_PATTERN |
 480                             IEEE80211_VHT_CAP_MAX_A_MPDU_LENGTH_EXPONENT_MASK),
 481         .supp_mcs = {
 482                 .rx_mcs_map = cpu_to_le16(~0),
 483                 .tx_mcs_map = cpu_to_le16(~0),
 484         },
 485 };
 486
 487 static const u8 extended_capabilities[] = {
 488         0, 0, 0, 0, 0, 0, 0,
 489         WLAN_EXT_CAPA8_OPMODE_NOTIF,
 490 };
 491
 492 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 493                                         const struct ieee80211_ops *ops)
 494 {
 495         struct ieee80211_local *local;
 496         int priv_size, i;
 497         struct wiphy *wiphy;
 498         bool use_chanctx;
 499
 500         if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
 501                     !ops->add_interface || !ops->remove_interface ||
 502                     !ops->configure_filter))
 503                 return NULL;
 504
 505         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
 506                 return NULL;
 507
 508         /* check all or no channel context operations exist */
 509         i = !!ops->add_chanctx + !!ops->remove_chanctx +
 510             !!ops->change_chanctx + !!ops->assign_vif_chanctx +
 511             !!ops->unassign_vif_chanctx;
 512         if (WARN_ON(i != 0 && i != 5))
 513                 return NULL;
 514         use_chanctx = i == 5;
 515
 516         /* Ensure 32-byte alignment of our private data and hw private data.
 517          * We use the wiphy priv data for both our ieee80211_local and for
 518          * the driver's private data
 519          *
 520          * In memory it'll be like this:
 521          *
 522          * +-------------------------+
 523          * | struct wiphy           |
 524          * +-------------------------+
 525          * | struct ieee80211_local  |
 526          * +-------------------------+
 527          * | driver's private data   |
 528          * +-------------------------+
 529          *
 530          */
 531         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 532
 533         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 534
 535         if (!wiphy)
 536                 return NULL;
 537
 538         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 539
 540         wiphy->privid = mac80211_wiphy_privid;
 541
 542         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 543                         WIPHY_FLAG_4ADDR_AP |
 544                         WIPHY_FLAG_4ADDR_STATION |
 545                         WIPHY_FLAG_REPORTS_OBSS |
 546                         WIPHY_FLAG_OFFCHAN_TX;
 547
 548         wiphy->extended_capabilities = extended_capabilities;
 549         wiphy->extended_capabilities_mask = extended_capabilities;
 550         wiphy->extended_capabilities_len = ARRAY_SIZE(extended_capabilities);
 551
 552         if (ops->remain_on_channel)
 553                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 554
 555         wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
 556                            NL80211_FEATURE_SAE |
 557                            NL80211_FEATURE_HT_IBSS |
 558                            NL80211_FEATURE_VIF_TXPOWER |
 559                            NL80211_FEATURE_USERSPACE_MPM;
 560
 561         if (!ops->hw_scan)
 562                 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
 563                                    NL80211_FEATURE_AP_SCAN;
 564
 565
 566         if (!ops->set_key)
 567                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 568
 569         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 570
 571         local = wiphy_priv(wiphy);
 572
 573         local->hw.wiphy = wiphy;
 574
 575         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 576
 577         local->ops = ops;
 578         local->use_chanctx = use_chanctx;
 579
 580         /* set up some defaults */
 581         local->hw.queues = 1;
 582         local->hw.max_rates = 1;
 583         local->hw.max_report_rates = 0;
 584         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 585         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 586         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
 587         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 588         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 589         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 590                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 591                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 592         local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 593                                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 594         local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
 595         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
 596         wiphy->vht_capa_mod_mask = &mac80211_vht_capa_mod_mask;
 597
 598         INIT_LIST_HEAD(&local->interfaces);
 599
 600         __hw_addr_init(&local->mc_list);
 601
 602         mutex_init(&local->iflist_mtx);
 603         mutex_init(&local->mtx);
 604
 605         mutex_init(&local->key_mtx);
 606         spin_lock_init(&local->filter_lock);
 607         spin_lock_init(&local->rx_path_lock);
 608         spin_lock_init(&local->queue_stop_reason_lock);
 609
 610         INIT_LIST_HEAD(&local->chanctx_list);
 611         mutex_init(&local->chanctx_mtx);
 612
 613         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 614
 615         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 616
 617         INIT_WORK(&local->radar_detected_work,
 618                   ieee80211_dfs_radar_detected_work);
 619
 620         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 621         local->smps_mode = IEEE80211_SMPS_OFF;
 622
 623         INIT_WORK(&local->dynamic_ps_enable_work,
 624                   ieee80211_dynamic_ps_enable_work);
 625         INIT_WORK(&local->dynamic_ps_disable_work,
 626                   ieee80211_dynamic_ps_disable_work);
 627         setup_timer(&local->dynamic_ps_timer,
 628                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 629
 630         INIT_WORK(&local->sched_scan_stopped_work,
 631                   ieee80211_sched_scan_stopped_work);
 632
 633         spin_lock_init(&local->ack_status_lock);
 634         idr_init(&local->ack_status_frames);
 635
 636         sta_info_init(local);
 637
 638         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 639                 skb_queue_head_init(&local->pending[i]);
 640                 atomic_set(&local->agg_queue_stop[i], 0);
 641         }
 642         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 643                      (unsigned long)local);
 644
 645         tasklet_init(&local->tasklet,
 646                      ieee80211_tasklet_handler,
 647                      (unsigned long) local);
 648
 649         skb_queue_head_init(&local->skb_queue);
 650         skb_queue_head_init(&local->skb_queue_unreliable);
 651
 652         ieee80211_led_names(local);
 653
 654         ieee80211_roc_setup(local);
 655
 656         return &local->hw;
 657 }
 658 EXPORT_SYMBOL(ieee80211_alloc_hw);
 659
 660 int ieee80211_register_hw(struct ieee80211_hw *hw)
 661 {
 662         struct ieee80211_local *local = hw_to_local(hw);
 663         int result, i;
 664         enum ieee80211_band band;
 665         int channels, max_bitrates;
 666         bool supp_ht, supp_vht;
 667         netdev_features_t feature_whitelist;
 668         static const u32 cipher_suites[] = {
 669                 /* keep WEP first, it may be removed below */
 670                 WLAN_CIPHER_SUITE_WEP40,
 671                 WLAN_CIPHER_SUITE_WEP104,
 672                 WLAN_CIPHER_SUITE_TKIP,
 673                 WLAN_CIPHER_SUITE_CCMP,
 674
 675                 /* keep last -- depends on hw flags! */
 676                 WLAN_CIPHER_SUITE_AES_CMAC
 677         };
 678
 679         if (hw->flags & IEEE80211_HW_QUEUE_CONTROL &&
 680             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
 681              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
 682                 return -EINVAL;
 683
 684 #ifdef CONFIG_PM
 685         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) &&
 686             (!local->ops->suspend || !local->ops->resume))
 687                 return -EINVAL;
 688 #endif
 689
 690         if (!local->use_chanctx) {
 691                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 692                         const struct ieee80211_iface_combination *comb;
 693
 694                         comb = &local->hw.wiphy->iface_combinations[i];
 695
 696                         if (comb->num_different_channels > 1)
 697                                 return -EINVAL;
 698                 }
 699         } else {
 700                 /*
 701                  * WDS is currently prohibited when channel contexts are used
 702                  * because there's no clear definition of which channel WDS
 703                  * type interfaces use
 704                  */
 705                 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))
 706                         return -EINVAL;
 707
 708                 /* DFS currently not supported with channel context drivers */
 709                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 710                         const struct ieee80211_iface_combination *comb;
 711
 712                         comb = &local->hw.wiphy->iface_combinations[i];
 713
 714                         if (comb->radar_detect_widths)
 715                                 return -EINVAL;
 716                 }
 717         }
 718
 719         /* Only HW csum features are currently compatible with mac80211 */
 720         feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 721                             NETIF_F_HW_CSUM;
 722         if (WARN_ON(hw->netdev_features & ~feature_whitelist))
 723                 return -EINVAL;
 724
 725         if (hw->max_report_rates == 0)
 726                 hw->max_report_rates = hw->max_rates;
 727
 728         local->rx_chains = 1;
 729
 730         /*
 731          * generic code guarantees at least one band,
 732          * set this very early because much code assumes
 733          * that hw.conf.channel is assigned
 734          */
 735         channels = 0;
 736         max_bitrates = 0;
 737         supp_ht = false;
 738         supp_vht = false;
 739         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 740                 struct ieee80211_supported_band *sband;
 741
 742                 sband = local->hw.wiphy->bands[band];
 743                 if (!sband)
 744                         continue;
 745                 if (!local->use_chanctx && !local->_oper_channel) {
 746                         /* init channel we're on */
 747                         local->hw.conf.channel =
 748                         local->_oper_channel = &sband->channels[0];
 749                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 750                 }
 751                 cfg80211_chandef_create(&local->monitor_chandef,
 752                                         &sband->channels[0],
 753                                         NL80211_CHAN_NO_HT);
 754                 channels += sband->n_channels;
 755
 756                 if (max_bitrates < sband->n_bitrates)
 757                         max_bitrates = sband->n_bitrates;
 758                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 759                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
 760
 761                 if (sband->ht_cap.ht_supported)
 762                         local->rx_chains =
 763                                 max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
 764                                     local->rx_chains);
 765
 766                 /* TODO: consider VHT for RX chains, hopefully it's the same */
 767         }
 768
 769         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 770                                       sizeof(void *) * channels, GFP_KERNEL);
 771         if (!local->int_scan_req)
 772                 return -ENOMEM;
 773
 774         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 775                 if (!local->hw.wiphy->bands[band])
 776                         continue;
 777                 local->int_scan_req->rates[band] = (u32) -1;
 778         }
 779
 780         /* if low-level driver supports AP, we also support VLAN */
 781         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
 782                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 783                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 784         }
 785
 786         /* mac80211 always supports monitor */
 787         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 788         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 789
 790         /* mac80211 doesn't support more than one IBSS interface right now */
 791         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 792                 const struct ieee80211_iface_combination *c;
 793                 int j;
 794
 795                 c = &hw->wiphy->iface_combinations[i];
 796
 797                 for (j = 0; j < c->n_limits; j++)
 798                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 799                             c->limits[j].max > 1)
 800                                 return -EINVAL;
 801         }
 802
 803 #ifndef CONFIG_MAC80211_MESH
 804         /* mesh depends on Kconfig, but drivers should set it if they want */
 805         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 806 #endif
 807
 808         /* if the underlying driver supports mesh, mac80211 will (at least)
 809          * provide routing of mesh authentication frames to userspace */
 810         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 811                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 812
 813         /* mac80211 supports control port protocol changing */
 814         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 815
 816         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 817                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 818         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 819                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 820
 821         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 822              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 823              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 824
 825         /*
 826          * Calculate scan IE length -- we need this to alloc
 827          * memory and to subtract from the driver limit. It
 828          * includes the DS Params, (extended) supported rates, and HT
 829          * information -- SSID is the driver's responsibility.
 830          */
 831         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 832                 3 /* DS Params */;
 833         if (supp_ht)
 834                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 835
 836         if (supp_vht) {
 837                 local->scan_ies_len +=
 838                         2 + sizeof(struct ieee80211_vht_cap);
 839
 840                 /*
 841                  * (for now at least), drivers wanting to use VHT must
 842                  * support channel contexts, as they contain all the
 843                  * necessary VHT information and the global hw config
 844                  * doesn't (yet)
 845                  */
 846                 if (WARN_ON(!local->use_chanctx)) {
 847                         result = -EINVAL;
 848                         goto fail_wiphy_register;
 849                 }
 850         }
 851
 852         if (!local->ops->hw_scan) {
 853                 /* For hw_scan, driver needs to set these up. */
 854                 local->hw.wiphy->max_scan_ssids = 4;
 855                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 856         }
 857
 858         /*
 859          * If the driver supports any scan IEs, then assume the
 860          * limit includes the IEs mac80211 will add, otherwise
 861          * leave it at zero and let the driver sort it out; we
 862          * still pass our IEs to the driver but userspace will
 863          * not be allowed to in that case.
 864          */
 865         if (local->hw.wiphy->max_scan_ie_len)
 866                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 867
 868         /* Set up cipher suites unless driver already did */
 869         if (!local->hw.wiphy->cipher_suites) {
 870                 local->hw.wiphy->cipher_suites = cipher_suites;
 871                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 872                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 873                         local->hw.wiphy->n_cipher_suites--;
 874         }
 875         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 876                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 877                         local->hw.wiphy->cipher_suites += 2;
 878                         local->hw.wiphy->n_cipher_suites -= 2;
 879                 } else {
 880                         u32 *suites;
 881                         int r, w = 0;
 882
 883                         /* Filter out WEP */
 884
 885                         suites = kmemdup(
 886                                 local->hw.wiphy->cipher_suites,
 887                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 888                                 GFP_KERNEL);
 889                         if (!suites) {
 890                                 result = -ENOMEM;
 891                                 goto fail_wiphy_register;
 892                         }
 893                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 894                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 895                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 896                                     suite == WLAN_CIPHER_SUITE_WEP104)
 897                                         continue;
 898                                 suites[w++] = suite;
 899                         }
 900                         local->hw.wiphy->cipher_suites = suites;
 901                         local->hw.wiphy->n_cipher_suites = w;
 902                         local->wiphy_ciphers_allocated = true;
 903                 }
 904         }
 905
 906         if (!local->ops->remain_on_channel)
 907                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
 908
 909         if (local->ops->sched_scan_start)
 910                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
 911
 912         /* mac80211 based drivers don't support internal TDLS setup */
 913         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
 914                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
 915
 916         result = wiphy_register(local->hw.wiphy);
 917         if (result < 0)
 918                 goto fail_wiphy_register;
 919
 920         /*
 921          * We use the number of queues for feature tests (QoS, HT) internally
 922          * so restrict them appropriately.
 923          */
 924         if (hw->queues > IEEE80211_MAX_QUEUES)
 925                 hw->queues = IEEE80211_MAX_QUEUES;
 926
 927         local->workqueue =
 928                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
 929         if (!local->workqueue) {
 930                 result = -ENOMEM;
 931                 goto fail_workqueue;
 932         }
 933
 934         /*
 935          * The hardware needs headroom for sending the frame,
 936          * and we need some headroom for passing the frame to monitor
 937          * interfaces, but never both at the same time.
 938          */
 939         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 940                                    IEEE80211_TX_STATUS_HEADROOM);
 941
 942         debugfs_hw_add(local);
 943
 944         /*
 945          * if the driver doesn't specify a max listen interval we
 946          * use 5 which should be a safe default
 947          */
 948         if (local->hw.max_listen_interval == 0)
 949                 local->hw.max_listen_interval = 5;
 950
 951         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 952
 953         local->dynamic_ps_forced_timeout = -1;
 954
 955         result = ieee80211_wep_init(local);
 956         if (result < 0)
 957                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 958                             result);
 959
 960         ieee80211_led_init(local);
 961
 962         rtnl_lock();
 963
 964         result = ieee80211_init_rate_ctrl_alg(local,
 965                                               hw->rate_control_algorithm);
 966         if (result < 0) {
 967                 wiphy_debug(local->hw.wiphy,
 968                             "Failed to initialize rate control algorithm\n");
 969                 goto fail_rate;
 970         }
 971
 972         /* add one default STA interface if supported */
 973         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 974                 result = ieee80211_if_add(local, "wlan%d", NULL,
 975                                           NL80211_IFTYPE_STATION, NULL);
 976                 if (result)
 977                         wiphy_warn(local->hw.wiphy,
 978                                    "Failed to add default virtual iface\n");
 979         }
 980
 981         rtnl_unlock();
 982
 983         local->network_latency_notifier.notifier_call =
 984                 ieee80211_max_network_latency;
 985         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 986                                      &local->network_latency_notifier);
 987         if (result) {
 988                 rtnl_lock();
 989                 goto fail_pm_qos;
 990         }
 991
 992 #ifdef CONFIG_INET
 993         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 994         result = register_inetaddr_notifier(&local->ifa_notifier);
 995         if (result)
 996                 goto fail_ifa;
 997 #endif
 998
 999 #if IS_ENABLED(CONFIG_IPV6)
1000         local->ifa6_notifier.notifier_call = ieee80211_ifa6_changed;
1001         result = register_inet6addr_notifier(&local->ifa6_notifier);
1002         if (result)
1003                 goto fail_ifa6;
1004 #endif
1005
1006         return 0;
1007
1008 #if IS_ENABLED(CONFIG_IPV6)
1009  fail_ifa6:
1010 #ifdef CONFIG_INET
1011         unregister_inetaddr_notifier(&local->ifa_notifier);
1012 #endif
1013 #endif
1014 #if defined(CONFIG_INET) || defined(CONFIG_IPV6)
1015  fail_ifa:
1016         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1017                                &local->network_latency_notifier);
1018         rtnl_lock();
1019 #endif
1020  fail_pm_qos:
1021         ieee80211_led_exit(local);
1022         ieee80211_remove_interfaces(local);
1023  fail_rate:
1024         rtnl_unlock();
1025         ieee80211_wep_free(local);
1026         sta_info_stop(local);
1027         destroy_workqueue(local->workqueue);
1028  fail_workqueue:
1029         wiphy_unregister(local->hw.wiphy);
1030  fail_wiphy_register:
1031         if (local->wiphy_ciphers_allocated)
1032                 kfree(local->hw.wiphy->cipher_suites);
1033         kfree(local->int_scan_req);
1034         return result;
1035 }
1036 EXPORT_SYMBOL(ieee80211_register_hw);
1037
1038 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1039 {
1040         struct ieee80211_local *local = hw_to_local(hw);
1041
1042         tasklet_kill(&local->tx_pending_tasklet);
1043         tasklet_kill(&local->tasklet);
1044
1045         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1046                                &local->network_latency_notifier);
1047 #ifdef CONFIG_INET
1048         unregister_inetaddr_notifier(&local->ifa_notifier);
1049 #endif
1050 #if IS_ENABLED(CONFIG_IPV6)
1051         unregister_inet6addr_notifier(&local->ifa6_notifier);
1052 #endif
1053
1054         rtnl_lock();
1055
1056         /*
1057          * At this point, interface list manipulations are fine
1058          * because the driver cannot be handing us frames any
1059          * more and the tasklet is killed.
1060          */
1061         ieee80211_remove_interfaces(local);
1062
1063         rtnl_unlock();
1064
1065         cancel_work_sync(&local->restart_work);
1066         cancel_work_sync(&local->reconfig_filter);
1067
1068         ieee80211_clear_tx_pending(local);
1069         rate_control_deinitialize(local);
1070
1071         if (skb_queue_len(&local->skb_queue) ||
1072             skb_queue_len(&local->skb_queue_unreliable))
1073                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1074         skb_queue_purge(&local->skb_queue);
1075         skb_queue_purge(&local->skb_queue_unreliable);
1076
1077         destroy_workqueue(local->workqueue);
1078         wiphy_unregister(local->hw.wiphy);
1079         sta_info_stop(local);
1080         ieee80211_wep_free(local);
1081         ieee80211_led_exit(local);
1082         kfree(local->int_scan_req);
1083 }
1084 EXPORT_SYMBOL(ieee80211_unregister_hw);
1085
1086 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1087 {
1088         WARN_ONCE(1, "Have pending ack frames!\n");
1089         kfree_skb(p);
1090         return 0;
1091 }
1092
1093 void ieee80211_free_hw(struct ieee80211_hw *hw)
1094 {
1095         struct ieee80211_local *local = hw_to_local(hw);
1096
1097         mutex_destroy(&local->iflist_mtx);
1098         mutex_destroy(&local->mtx);
1099
1100         if (local->wiphy_ciphers_allocated)
1101                 kfree(local->hw.wiphy->cipher_suites);
1102
1103         idr_for_each(&local->ack_status_frames,
1104                      ieee80211_free_ack_frame, NULL);
1105         idr_destroy(&local->ack_status_frames);
1106
1107         wiphy_free(local->hw.wiphy);
1108 }
1109 EXPORT_SYMBOL(ieee80211_free_hw);
1110
1111 static int __init ieee80211_init(void)
1112 {
1113         struct sk_buff *skb;
1114         int ret;
1115
1116         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1117         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1118                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1119
1120         ret = rc80211_minstrel_init();
1121         if (ret)
1122                 return ret;
1123
1124         ret = rc80211_minstrel_ht_init();
1125         if (ret)
1126                 goto err_minstrel;
1127
1128         ret = rc80211_pid_init();
1129         if (ret)
1130                 goto err_pid;
1131
1132         ret = ieee80211_iface_init();
1133         if (ret)
1134                 goto err_netdev;
1135
1136         return 0;
1137  err_netdev:
1138         rc80211_pid_exit();
1139  err_pid:
1140         rc80211_minstrel_ht_exit();
1141  err_minstrel:
1142         rc80211_minstrel_exit();
1143
1144         return ret;
1145 }
1146
1147 static void __exit ieee80211_exit(void)
1148 {
1149         rc80211_pid_exit();
1150         rc80211_minstrel_ht_exit();
1151         rc80211_minstrel_exit();
1152
1153         ieee80211s_stop();
1154
1155         ieee80211_iface_exit();
1156
1157         rcu_barrier();
1158 }
1159
1160
1161 subsys_initcall(ieee80211_init);
1162 module_exit(ieee80211_exit);
1163
1164 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1165 MODULE_LICENSE("GPL");