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
  27 #include "ieee80211_i.h"
  28 #include "driver-ops.h"
  29 #include "rate.h"
  30 #include "mesh.h"
  31 #include "wep.h"
  32 #include "led.h"
  33 #include "cfg.h"
  34 #include "debugfs.h"
  35
  36 static struct lock_class_key ieee80211_rx_skb_queue_class;
  37
  38 void ieee80211_configure_filter(struct ieee80211_local *local)
  39 {
  40         u64 mc;
  41         unsigned int changed_flags;
  42         unsigned int new_flags = 0;
  43
  44         if (atomic_read(&local->iff_promiscs))
  45                 new_flags |= FIF_PROMISC_IN_BSS;
  46
  47         if (atomic_read(&local->iff_allmultis))
  48                 new_flags |= FIF_ALLMULTI;
  49
  50         if (local->monitors || test_bit(SCAN_SW_SCANNING, &local->scanning) ||
  51             test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning))
  52                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  53
  54         if (local->fif_probe_req || local->probe_req_reg)
  55                 new_flags |= FIF_PROBE_REQ;
  56
  57         if (local->fif_fcsfail)
  58                 new_flags |= FIF_FCSFAIL;
  59
  60         if (local->fif_plcpfail)
  61                 new_flags |= FIF_PLCPFAIL;
  62
  63         if (local->fif_control)
  64                 new_flags |= FIF_CONTROL;
  65
  66         if (local->fif_other_bss)
  67                 new_flags |= FIF_OTHER_BSS;
  68
  69         if (local->fif_pspoll)
  70                 new_flags |= FIF_PSPOLL;
  71
  72         spin_lock_bh(&local->filter_lock);
  73         changed_flags = local->filter_flags ^ new_flags;
  74
  75         mc = drv_prepare_multicast(local, &local->mc_list);
  76         spin_unlock_bh(&local->filter_lock);
  77
  78         /* be a bit nasty */
  79         new_flags |= (1<<31);
  80
  81         drv_configure_filter(local, changed_flags, &new_flags, mc);
  82
  83         WARN_ON(new_flags & (1<<31));
  84
  85         local->filter_flags = new_flags & ~(1<<31);
  86 }
  87
  88 static void ieee80211_reconfig_filter(struct work_struct *work)
  89 {
  90         struct ieee80211_local *local =
  91                 container_of(work, struct ieee80211_local, reconfig_filter);
  92
  93         ieee80211_configure_filter(local);
  94 }
  95
  96 static u32 ieee80211_hw_conf_chan(struct ieee80211_local *local)
  97 {
  98         struct ieee80211_sub_if_data *sdata;
  99         struct ieee80211_channel *chan;
 100         u32 changed = 0;
 101         int power;
 102         enum nl80211_channel_type channel_type;
 103         u32 offchannel_flag;
 104         bool scanning = false;
 105
 106         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 107         if (local->scan_channel) {
 108                 chan = local->scan_channel;
 109                 /* If scanning on oper channel, use whatever channel-type
 110                  * is currently in use.
 111                  */
 112                 if (chan == local->_oper_channel)
 113                         channel_type = local->_oper_channel_type;
 114                 else
 115                         channel_type = NL80211_CHAN_NO_HT;
 116         } else if (local->tmp_channel) {
 117                 chan = local->tmp_channel;
 118                 channel_type = NL80211_CHAN_NO_HT;
 119         } else {
 120                 chan = local->_oper_channel;
 121                 channel_type = local->_oper_channel_type;
 122         }
 123
 124         if (chan != local->_oper_channel ||
 125             channel_type != local->_oper_channel_type)
 126                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 127         else
 128                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 129
 130         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 131
 132         if (offchannel_flag || chan != local->hw.conf.channel ||
 133             channel_type != local->hw.conf.channel_type) {
 134                 local->hw.conf.channel = chan;
 135                 local->hw.conf.channel_type = channel_type;
 136                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 137         }
 138
 139         if (!conf_is_ht(&local->hw.conf)) {
 140                 /*
 141                  * mac80211.h documents that this is only valid
 142                  * when the channel is set to an HT type, and
 143                  * that otherwise STATIC is used.
 144                  */
 145                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 146         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 147                 local->hw.conf.smps_mode = local->smps_mode;
 148                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 149         }
 150
 151         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 152                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning) ||
 153                    test_bit(SCAN_HW_SCANNING, &local->scanning);
 154         power = chan->max_power;
 155
 156         rcu_read_lock();
 157         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 158                 if (!rcu_access_pointer(sdata->vif.chanctx_conf))
 159                         continue;
 160                 power = min(power, sdata->vif.bss_conf.txpower);
 161         }
 162         rcu_read_unlock();
 163
 164         if (local->hw.conf.power_level != power) {
 165                 changed |= IEEE80211_CONF_CHANGE_POWER;
 166                 local->hw.conf.power_level = power;
 167         }
 168
 169         return changed;
 170 }
 171
 172 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 173 {
 174         int ret = 0;
 175
 176         might_sleep();
 177
 178         if (!local->use_chanctx)
 179                 changed |= ieee80211_hw_conf_chan(local);
 180         else
 181                 changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL |
 182                              IEEE80211_CONF_CHANGE_POWER);
 183
 184         if (changed && local->open_count) {
 185                 ret = drv_config(local, changed);
 186                 /*
 187                  * Goal:
 188                  * HW reconfiguration should never fail, the driver has told
 189                  * us what it can support so it should live up to that promise.
 190                  *
 191                  * Current status:
 192                  * rfkill is not integrated with mac80211 and a
 193                  * configuration command can thus fail if hardware rfkill
 194                  * is enabled
 195                  *
 196                  * FIXME: integrate rfkill with mac80211 and then add this
 197                  * WARN_ON() back
 198                  *
 199                  */
 200                 /* WARN_ON(ret); */
 201         }
 202
 203         return ret;
 204 }
 205
 206 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 207                                       u32 changed)
 208 {
 209         struct ieee80211_local *local = sdata->local;
 210         static const u8 zero[ETH_ALEN] = { 0 };
 211
 212         if (!changed)
 213                 return;
 214
 215         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 216                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 217         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 218                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 219         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 220                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 221         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
 222                 sdata->vif.bss_conf.bssid = NULL;
 223         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 224                 sdata->vif.bss_conf.bssid = zero;
 225         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 226                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 227                 WARN_ONCE(changed & ~(BSS_CHANGED_IDLE),
 228                           "P2P Device BSS changed %#x", changed);
 229         } else {
 230                 WARN_ON(1);
 231                 return;
 232         }
 233
 234         switch (sdata->vif.type) {
 235         case NL80211_IFTYPE_AP:
 236         case NL80211_IFTYPE_ADHOC:
 237         case NL80211_IFTYPE_WDS:
 238         case NL80211_IFTYPE_MESH_POINT:
 239                 break;
 240         default:
 241                 /* do not warn to simplify caller in scan.c */
 242                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 243                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 244                         return;
 245                 break;
 246         }
 247
 248         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 249 }
 250
 251 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 252 {
 253         sdata->vif.bss_conf.use_cts_prot = false;
 254         sdata->vif.bss_conf.use_short_preamble = false;
 255         sdata->vif.bss_conf.use_short_slot = false;
 256         return BSS_CHANGED_ERP_CTS_PROT |
 257                BSS_CHANGED_ERP_PREAMBLE |
 258                BSS_CHANGED_ERP_SLOT;
 259 }
 260
 261 static void ieee80211_tasklet_handler(unsigned long data)
 262 {
 263         struct ieee80211_local *local = (struct ieee80211_local *) data;
 264         struct sta_info *sta, *tmp;
 265         struct skb_eosp_msg_data *eosp_data;
 266         struct sk_buff *skb;
 267
 268         while ((skb = skb_dequeue(&local->skb_queue)) ||
 269                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 270                 switch (skb->pkt_type) {
 271                 case IEEE80211_RX_MSG:
 272                         /* Clear skb->pkt_type in order to not confuse kernel
 273                          * netstack. */
 274                         skb->pkt_type = 0;
 275                         ieee80211_rx(&local->hw, skb);
 276                         break;
 277                 case IEEE80211_TX_STATUS_MSG:
 278                         skb->pkt_type = 0;
 279                         ieee80211_tx_status(&local->hw, skb);
 280                         break;
 281                 case IEEE80211_EOSP_MSG:
 282                         eosp_data = (void *)skb->cb;
 283                         for_each_sta_info(local, eosp_data->sta, sta, tmp) {
 284                                 /* skip wrong virtual interface */
 285                                 if (memcmp(eosp_data->iface,
 286                                            sta->sdata->vif.addr, ETH_ALEN))
 287                                         continue;
 288                                 clear_sta_flag(sta, WLAN_STA_SP);
 289                                 break;
 290                         }
 291                         dev_kfree_skb(skb);
 292                         break;
 293                 default:
 294                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 295                              skb->pkt_type);
 296                         dev_kfree_skb(skb);
 297                         break;
 298                 }
 299         }
 300 }
 301
 302 static void ieee80211_restart_work(struct work_struct *work)
 303 {
 304         struct ieee80211_local *local =
 305                 container_of(work, struct ieee80211_local, restart_work);
 306
 307         /* wait for scan work complete */
 308         flush_workqueue(local->workqueue);
 309
 310         mutex_lock(&local->mtx);
 311         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
 312              rcu_dereference_protected(local->sched_scan_sdata,
 313                                        lockdep_is_held(&local->mtx)),
 314                 "%s called with hardware scan in progress\n", __func__);
 315         mutex_unlock(&local->mtx);
 316
 317         rtnl_lock();
 318         ieee80211_scan_cancel(local);
 319         ieee80211_reconfig(local);
 320         rtnl_unlock();
 321 }
 322
 323 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 324 {
 325         struct ieee80211_local *local = hw_to_local(hw);
 326
 327         trace_api_restart_hw(local);
 328
 329         wiphy_info(hw->wiphy,
 330                    "Hardware restart was requested\n");
 331
 332         /* use this reason, ieee80211_reconfig will unblock it */
 333         ieee80211_stop_queues_by_reason(hw,
 334                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 335
 336         /*
 337          * Stop all Rx during the reconfig. We don't want state changes
 338          * or driver callbacks while this is in progress.
 339          */
 340         local->in_reconfig = true;
 341         barrier();
 342
 343         schedule_work(&local->restart_work);
 344 }
 345 EXPORT_SYMBOL(ieee80211_restart_hw);
 346
 347 #ifdef CONFIG_INET
 348 static int ieee80211_ifa_changed(struct notifier_block *nb,
 349                                  unsigned long data, void *arg)
 350 {
 351         struct in_ifaddr *ifa = arg;
 352         struct ieee80211_local *local =
 353                 container_of(nb, struct ieee80211_local,
 354                              ifa_notifier);
 355         struct net_device *ndev = ifa->ifa_dev->dev;
 356         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 357         struct in_device *idev;
 358         struct ieee80211_sub_if_data *sdata;
 359         struct ieee80211_bss_conf *bss_conf;
 360         struct ieee80211_if_managed *ifmgd;
 361         int c = 0;
 362
 363         /* Make sure it's our interface that got changed */
 364         if (!wdev)
 365                 return NOTIFY_DONE;
 366
 367         if (wdev->wiphy != local->hw.wiphy)
 368                 return NOTIFY_DONE;
 369
 370         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 371         bss_conf = &sdata->vif.bss_conf;
 372
 373         /* ARP filtering is only supported in managed mode */
 374         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 375                 return NOTIFY_DONE;
 376
 377         idev = __in_dev_get_rtnl(sdata->dev);
 378         if (!idev)
 379                 return NOTIFY_DONE;
 380
 381         ifmgd = &sdata->u.mgd;
 382         mutex_lock(&ifmgd->mtx);
 383
 384         /* Copy the addresses to the bss_conf list */
 385         ifa = idev->ifa_list;
 386         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
 387                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
 388                 ifa = ifa->ifa_next;
 389                 c++;
 390         }
 391
 392         /* If not all addresses fit the list, disable filtering */
 393         if (ifa) {
 394                 sdata->arp_filter_state = false;
 395                 c = 0;
 396         } else {
 397                 sdata->arp_filter_state = true;
 398         }
 399         bss_conf->arp_addr_cnt = c;
 400
 401         /* Configure driver only if associated (which also implies it is up) */
 402         if (ifmgd->associated) {
 403                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 404                 ieee80211_bss_info_change_notify(sdata,
 405                                                  BSS_CHANGED_ARP_FILTER);
 406         }
 407
 408         mutex_unlock(&ifmgd->mtx);
 409
 410         return NOTIFY_DONE;
 411 }
 412 #endif
 413
 414 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
 415 {
 416         struct ieee80211_local *local =
 417                 container_of(napi, struct ieee80211_local, napi);
 418
 419         return local->ops->napi_poll(&local->hw, budget);
 420 }
 421
 422 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
 423 {
 424         struct ieee80211_local *local = hw_to_local(hw);
 425
 426         napi_schedule(&local->napi);
 427 }
 428 EXPORT_SYMBOL(ieee80211_napi_schedule);
 429
 430 void ieee80211_napi_complete(struct ieee80211_hw *hw)
 431 {
 432         struct ieee80211_local *local = hw_to_local(hw);
 433
 434         napi_complete(&local->napi);
 435 }
 436 EXPORT_SYMBOL(ieee80211_napi_complete);
 437
 438 /* There isn't a lot of sense in it, but you can transmit anything you like */
 439 static const struct ieee80211_txrx_stypes
 440 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 441         [NL80211_IFTYPE_ADHOC] = {
 442                 .tx = 0xffff,
 443                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 444                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 445                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 446                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 447         },
 448         [NL80211_IFTYPE_STATION] = {
 449                 .tx = 0xffff,
 450                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 451                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 452         },
 453         [NL80211_IFTYPE_AP] = {
 454                 .tx = 0xffff,
 455                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 456                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 457                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 458                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 459                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 460                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 461                         BIT(IEEE80211_STYPE_ACTION >> 4),
 462         },
 463         [NL80211_IFTYPE_AP_VLAN] = {
 464                 /* copy AP */
 465                 .tx = 0xffff,
 466                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 467                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 468                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 469                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 470                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 471                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 472                         BIT(IEEE80211_STYPE_ACTION >> 4),
 473         },
 474         [NL80211_IFTYPE_P2P_CLIENT] = {
 475                 .tx = 0xffff,
 476                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 477                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 478         },
 479         [NL80211_IFTYPE_P2P_GO] = {
 480                 .tx = 0xffff,
 481                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 482                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 483                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 484                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 485                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 486                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 487                         BIT(IEEE80211_STYPE_ACTION >> 4),
 488         },
 489         [NL80211_IFTYPE_MESH_POINT] = {
 490                 .tx = 0xffff,
 491                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 492                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 493                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 494         },
 495         [NL80211_IFTYPE_P2P_DEVICE] = {
 496                 .tx = 0xffff,
 497                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 498                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 499         },
 500 };
 501
 502 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
 503         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
 504                              IEEE80211_HT_AMPDU_PARM_DENSITY,
 505
 506         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 507                                 IEEE80211_HT_CAP_MAX_AMSDU |
 508                                 IEEE80211_HT_CAP_SGI_20 |
 509                                 IEEE80211_HT_CAP_SGI_40),
 510         .mcs = {
 511                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
 512                              0xff, 0xff, 0xff, 0xff, 0xff, },
 513         },
 514 };
 515
 516 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 517                                         const struct ieee80211_ops *ops)
 518 {
 519         struct ieee80211_local *local;
 520         int priv_size, i;
 521         struct wiphy *wiphy;
 522         bool use_chanctx;
 523
 524         if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
 525                     !ops->add_interface || !ops->remove_interface ||
 526                     !ops->configure_filter))
 527                 return NULL;
 528
 529         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
 530                 return NULL;
 531
 532         /* check all or no channel context operations exist */
 533         i = !!ops->add_chanctx + !!ops->remove_chanctx +
 534             !!ops->change_chanctx + !!ops->assign_vif_chanctx +
 535             !!ops->unassign_vif_chanctx;
 536         if (WARN_ON(i != 0 && i != 5))
 537                 return NULL;
 538         use_chanctx = i == 5;
 539
 540         /* Ensure 32-byte alignment of our private data and hw private data.
 541          * We use the wiphy priv data for both our ieee80211_local and for
 542          * the driver's private data
 543          *
 544          * In memory it'll be like this:
 545          *
 546          * +-------------------------+
 547          * | struct wiphy           |
 548          * +-------------------------+
 549          * | struct ieee80211_local  |
 550          * +-------------------------+
 551          * | driver's private data   |
 552          * +-------------------------+
 553          *
 554          */
 555         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 556
 557         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 558
 559         if (!wiphy)
 560                 return NULL;
 561
 562         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 563
 564         wiphy->privid = mac80211_wiphy_privid;
 565
 566         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 567                         WIPHY_FLAG_4ADDR_AP |
 568                         WIPHY_FLAG_4ADDR_STATION |
 569                         WIPHY_FLAG_REPORTS_OBSS |
 570                         WIPHY_FLAG_OFFCHAN_TX;
 571
 572         if (ops->remain_on_channel)
 573                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 574
 575         wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
 576                            NL80211_FEATURE_SAE |
 577                            NL80211_FEATURE_HT_IBSS |
 578                            NL80211_FEATURE_VIF_TXPOWER;
 579
 580         if (!ops->hw_scan)
 581                 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
 582                                    NL80211_FEATURE_AP_SCAN;
 583
 584
 585         if (!ops->set_key)
 586                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 587
 588         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 589
 590         local = wiphy_priv(wiphy);
 591
 592         local->hw.wiphy = wiphy;
 593
 594         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 595
 596         local->ops = ops;
 597         local->use_chanctx = use_chanctx;
 598
 599         /* set up some defaults */
 600         local->hw.queues = 1;
 601         local->hw.max_rates = 1;
 602         local->hw.max_report_rates = 0;
 603         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 604         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 605         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
 606         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 607         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 608         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 609                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 610                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 611         local->hw.radiotap_vht_details = IEEE80211_RADIOTAP_VHT_KNOWN_GI |
 612                                          IEEE80211_RADIOTAP_VHT_KNOWN_BANDWIDTH;
 613         local->user_power_level = IEEE80211_UNSET_POWER_LEVEL;
 614         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
 615
 616         INIT_LIST_HEAD(&local->interfaces);
 617
 618         __hw_addr_init(&local->mc_list);
 619
 620         mutex_init(&local->iflist_mtx);
 621         mutex_init(&local->mtx);
 622
 623         mutex_init(&local->key_mtx);
 624         spin_lock_init(&local->filter_lock);
 625         spin_lock_init(&local->queue_stop_reason_lock);
 626
 627         INIT_LIST_HEAD(&local->chanctx_list);
 628         mutex_init(&local->chanctx_mtx);
 629
 630         /*
 631          * The rx_skb_queue is only accessed from tasklets,
 632          * but other SKB queues are used from within IRQ
 633          * context. Therefore, this one needs a different
 634          * locking class so our direct, non-irq-safe use of
 635          * the queue's lock doesn't throw lockdep warnings.
 636          */
 637         skb_queue_head_init_class(&local->rx_skb_queue,
 638                                   &ieee80211_rx_skb_queue_class);
 639
 640         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 641
 642         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 643
 644         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 645         local->smps_mode = IEEE80211_SMPS_OFF;
 646
 647         INIT_WORK(&local->dynamic_ps_enable_work,
 648                   ieee80211_dynamic_ps_enable_work);
 649         INIT_WORK(&local->dynamic_ps_disable_work,
 650                   ieee80211_dynamic_ps_disable_work);
 651         setup_timer(&local->dynamic_ps_timer,
 652                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 653
 654         INIT_WORK(&local->sched_scan_stopped_work,
 655                   ieee80211_sched_scan_stopped_work);
 656
 657         spin_lock_init(&local->ack_status_lock);
 658         idr_init(&local->ack_status_frames);
 659         /* preallocate at least one entry */
 660         idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
 661
 662         sta_info_init(local);
 663
 664         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 665                 skb_queue_head_init(&local->pending[i]);
 666                 atomic_set(&local->agg_queue_stop[i], 0);
 667         }
 668         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 669                      (unsigned long)local);
 670
 671         tasklet_init(&local->tasklet,
 672                      ieee80211_tasklet_handler,
 673                      (unsigned long) local);
 674
 675         skb_queue_head_init(&local->skb_queue);
 676         skb_queue_head_init(&local->skb_queue_unreliable);
 677
 678         /* init dummy netdev for use w/ NAPI */
 679         init_dummy_netdev(&local->napi_dev);
 680
 681         ieee80211_led_names(local);
 682
 683         ieee80211_roc_setup(local);
 684
 685         return &local->hw;
 686 }
 687 EXPORT_SYMBOL(ieee80211_alloc_hw);
 688
 689 int ieee80211_register_hw(struct ieee80211_hw *hw)
 690 {
 691         struct ieee80211_local *local = hw_to_local(hw);
 692         int result, i;
 693         enum ieee80211_band band;
 694         int channels, max_bitrates;
 695         bool supp_ht, supp_vht;
 696         netdev_features_t feature_whitelist;
 697         static const u32 cipher_suites[] = {
 698                 /* keep WEP first, it may be removed below */
 699                 WLAN_CIPHER_SUITE_WEP40,
 700                 WLAN_CIPHER_SUITE_WEP104,
 701                 WLAN_CIPHER_SUITE_TKIP,
 702                 WLAN_CIPHER_SUITE_CCMP,
 703
 704                 /* keep last -- depends on hw flags! */
 705                 WLAN_CIPHER_SUITE_AES_CMAC
 706         };
 707
 708         if (hw->flags & IEEE80211_HW_QUEUE_CONTROL &&
 709             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
 710              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
 711                 return -EINVAL;
 712
 713 #ifdef CONFIG_PM
 714         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) &&
 715             (!local->ops->suspend || !local->ops->resume))
 716                 return -EINVAL;
 717 #endif
 718
 719         if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan)
 720                 return -EINVAL;
 721
 722         if (!local->use_chanctx) {
 723                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 724                         const struct ieee80211_iface_combination *comb;
 725
 726                         comb = &local->hw.wiphy->iface_combinations[i];
 727
 728                         if (comb->num_different_channels > 1)
 729                                 return -EINVAL;
 730                 }
 731         } else {
 732                 /*
 733                  * WDS is currently prohibited when channel contexts are used
 734                  * because there's no clear definition of which channel WDS
 735                  * type interfaces use
 736                  */
 737                 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))
 738                         return -EINVAL;
 739         }
 740
 741         /* Only HW csum features are currently compatible with mac80211 */
 742         feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 743                             NETIF_F_HW_CSUM;
 744         if (WARN_ON(hw->netdev_features & ~feature_whitelist))
 745                 return -EINVAL;
 746
 747         if (hw->max_report_rates == 0)
 748                 hw->max_report_rates = hw->max_rates;
 749
 750         local->rx_chains = 1;
 751
 752         /*
 753          * generic code guarantees at least one band,
 754          * set this very early because much code assumes
 755          * that hw.conf.channel is assigned
 756          */
 757         channels = 0;
 758         max_bitrates = 0;
 759         supp_ht = false;
 760         supp_vht = false;
 761         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 762                 struct ieee80211_supported_band *sband;
 763
 764                 sband = local->hw.wiphy->bands[band];
 765                 if (!sband)
 766                         continue;
 767                 if (!local->use_chanctx && !local->_oper_channel) {
 768                         /* init channel we're on */
 769                         local->hw.conf.channel =
 770                         local->_oper_channel = &sband->channels[0];
 771                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 772                 }
 773                 cfg80211_chandef_create(&local->monitor_chandef,
 774                                         &sband->channels[0],
 775                                         NL80211_CHAN_NO_HT);
 776                 channels += sband->n_channels;
 777
 778                 if (max_bitrates < sband->n_bitrates)
 779                         max_bitrates = sband->n_bitrates;
 780                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 781                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
 782
 783                 if (sband->ht_cap.ht_supported)
 784                         local->rx_chains =
 785                                 max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
 786                                     local->rx_chains);
 787
 788                 /* TODO: consider VHT for RX chains, hopefully it's the same */
 789         }
 790
 791         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 792                                       sizeof(void *) * channels, GFP_KERNEL);
 793         if (!local->int_scan_req)
 794                 return -ENOMEM;
 795
 796         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 797                 if (!local->hw.wiphy->bands[band])
 798                         continue;
 799                 local->int_scan_req->rates[band] = (u32) -1;
 800         }
 801
 802         /* if low-level driver supports AP, we also support VLAN */
 803         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
 804                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 805                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 806         }
 807
 808         /* mac80211 always supports monitor */
 809         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 810         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 811
 812         /* mac80211 doesn't support more than one IBSS interface right now */
 813         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 814                 const struct ieee80211_iface_combination *c;
 815                 int j;
 816
 817                 c = &hw->wiphy->iface_combinations[i];
 818
 819                 for (j = 0; j < c->n_limits; j++)
 820                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 821                             c->limits[j].max > 1)
 822                                 return -EINVAL;
 823         }
 824
 825 #ifndef CONFIG_MAC80211_MESH
 826         /* mesh depends on Kconfig, but drivers should set it if they want */
 827         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 828 #endif
 829
 830         /* if the underlying driver supports mesh, mac80211 will (at least)
 831          * provide routing of mesh authentication frames to userspace */
 832         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 833                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 834
 835         /* mac80211 supports control port protocol changing */
 836         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 837
 838         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 839                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 840         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 841                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 842
 843         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 844              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 845              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 846
 847         /*
 848          * Calculate scan IE length -- we need this to alloc
 849          * memory and to subtract from the driver limit. It
 850          * includes the DS Params, (extended) supported rates, and HT
 851          * information -- SSID is the driver's responsibility.
 852          */
 853         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 854                 3 /* DS Params */;
 855         if (supp_ht)
 856                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 857
 858         if (supp_vht) {
 859                 local->scan_ies_len +=
 860                         2 + sizeof(struct ieee80211_vht_cap);
 861
 862                 /*
 863                  * (for now at least), drivers wanting to use VHT must
 864                  * support channel contexts, as they contain all the
 865                  * necessary VHT information and the global hw config
 866                  * doesn't (yet)
 867                  */
 868                 if (WARN_ON(!local->use_chanctx)) {
 869                         result = -EINVAL;
 870                         goto fail_wiphy_register;
 871                 }
 872         }
 873
 874         if (!local->ops->hw_scan) {
 875                 /* For hw_scan, driver needs to set these up. */
 876                 local->hw.wiphy->max_scan_ssids = 4;
 877                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 878         }
 879
 880         /*
 881          * If the driver supports any scan IEs, then assume the
 882          * limit includes the IEs mac80211 will add, otherwise
 883          * leave it at zero and let the driver sort it out; we
 884          * still pass our IEs to the driver but userspace will
 885          * not be allowed to in that case.
 886          */
 887         if (local->hw.wiphy->max_scan_ie_len)
 888                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 889
 890         /* Set up cipher suites unless driver already did */
 891         if (!local->hw.wiphy->cipher_suites) {
 892                 local->hw.wiphy->cipher_suites = cipher_suites;
 893                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 894                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 895                         local->hw.wiphy->n_cipher_suites--;
 896         }
 897         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 898                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 899                         local->hw.wiphy->cipher_suites += 2;
 900                         local->hw.wiphy->n_cipher_suites -= 2;
 901                 } else {
 902                         u32 *suites;
 903                         int r, w = 0;
 904
 905                         /* Filter out WEP */
 906
 907                         suites = kmemdup(
 908                                 local->hw.wiphy->cipher_suites,
 909                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 910                                 GFP_KERNEL);
 911                         if (!suites) {
 912                                 result = -ENOMEM;
 913                                 goto fail_wiphy_register;
 914                         }
 915                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 916                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 917                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 918                                     suite == WLAN_CIPHER_SUITE_WEP104)
 919                                         continue;
 920                                 suites[w++] = suite;
 921                         }
 922                         local->hw.wiphy->cipher_suites = suites;
 923                         local->hw.wiphy->n_cipher_suites = w;
 924                         local->wiphy_ciphers_allocated = true;
 925                 }
 926         }
 927
 928         if (!local->ops->remain_on_channel)
 929                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
 930
 931         if (local->ops->sched_scan_start)
 932                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
 933
 934         /* mac80211 based drivers don't support internal TDLS setup */
 935         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
 936                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
 937
 938         result = wiphy_register(local->hw.wiphy);
 939         if (result < 0)
 940                 goto fail_wiphy_register;
 941
 942         /*
 943          * We use the number of queues for feature tests (QoS, HT) internally
 944          * so restrict them appropriately.
 945          */
 946         if (hw->queues > IEEE80211_MAX_QUEUES)
 947                 hw->queues = IEEE80211_MAX_QUEUES;
 948
 949         local->workqueue =
 950                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
 951         if (!local->workqueue) {
 952                 result = -ENOMEM;
 953                 goto fail_workqueue;
 954         }
 955
 956         /*
 957          * The hardware needs headroom for sending the frame,
 958          * and we need some headroom for passing the frame to monitor
 959          * interfaces, but never both at the same time.
 960          */
 961         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 962                                    IEEE80211_TX_STATUS_HEADROOM);
 963
 964         debugfs_hw_add(local);
 965
 966         /*
 967          * if the driver doesn't specify a max listen interval we
 968          * use 5 which should be a safe default
 969          */
 970         if (local->hw.max_listen_interval == 0)
 971                 local->hw.max_listen_interval = 5;
 972
 973         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 974
 975         local->dynamic_ps_forced_timeout = -1;
 976
 977         result = ieee80211_wep_init(local);
 978         if (result < 0)
 979                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 980                             result);
 981
 982         ieee80211_led_init(local);
 983
 984         rtnl_lock();
 985
 986         result = ieee80211_init_rate_ctrl_alg(local,
 987                                               hw->rate_control_algorithm);
 988         if (result < 0) {
 989                 wiphy_debug(local->hw.wiphy,
 990                             "Failed to initialize rate control algorithm\n");
 991                 goto fail_rate;
 992         }
 993
 994         /* add one default STA interface if supported */
 995         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 996                 result = ieee80211_if_add(local, "wlan%d", NULL,
 997                                           NL80211_IFTYPE_STATION, NULL);
 998                 if (result)
 999                         wiphy_warn(local->hw.wiphy,
1000                                    "Failed to add default virtual iface\n");
1001         }
1002
1003         rtnl_unlock();
1004
1005         local->network_latency_notifier.notifier_call =
1006                 ieee80211_max_network_latency;
1007         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
1008                                      &local->network_latency_notifier);
1009         if (result) {
1010                 rtnl_lock();
1011                 goto fail_pm_qos;
1012         }
1013
1014 #ifdef CONFIG_INET
1015         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
1016         result = register_inetaddr_notifier(&local->ifa_notifier);
1017         if (result)
1018                 goto fail_ifa;
1019 #endif
1020
1021         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
1022                         local->hw.napi_weight);
1023
1024         return 0;
1025
1026 #ifdef CONFIG_INET
1027  fail_ifa:
1028         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1029                                &local->network_latency_notifier);
1030         rtnl_lock();
1031 #endif
1032  fail_pm_qos:
1033         ieee80211_led_exit(local);
1034         ieee80211_remove_interfaces(local);
1035  fail_rate:
1036         rtnl_unlock();
1037         ieee80211_wep_free(local);
1038         sta_info_stop(local);
1039         destroy_workqueue(local->workqueue);
1040  fail_workqueue:
1041         wiphy_unregister(local->hw.wiphy);
1042  fail_wiphy_register:
1043         if (local->wiphy_ciphers_allocated)
1044                 kfree(local->hw.wiphy->cipher_suites);
1045         kfree(local->int_scan_req);
1046         return result;
1047 }
1048 EXPORT_SYMBOL(ieee80211_register_hw);
1049
1050 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1051 {
1052         struct ieee80211_local *local = hw_to_local(hw);
1053
1054         tasklet_kill(&local->tx_pending_tasklet);
1055         tasklet_kill(&local->tasklet);
1056
1057         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1058                                &local->network_latency_notifier);
1059 #ifdef CONFIG_INET
1060         unregister_inetaddr_notifier(&local->ifa_notifier);
1061 #endif
1062
1063         rtnl_lock();
1064
1065         /*
1066          * At this point, interface list manipulations are fine
1067          * because the driver cannot be handing us frames any
1068          * more and the tasklet is killed.
1069          */
1070         ieee80211_remove_interfaces(local);
1071
1072         rtnl_unlock();
1073
1074         cancel_work_sync(&local->restart_work);
1075         cancel_work_sync(&local->reconfig_filter);
1076
1077         ieee80211_clear_tx_pending(local);
1078         rate_control_deinitialize(local);
1079
1080         if (skb_queue_len(&local->skb_queue) ||
1081             skb_queue_len(&local->skb_queue_unreliable))
1082                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1083         skb_queue_purge(&local->skb_queue);
1084         skb_queue_purge(&local->skb_queue_unreliable);
1085         skb_queue_purge(&local->rx_skb_queue);
1086
1087         destroy_workqueue(local->workqueue);
1088         wiphy_unregister(local->hw.wiphy);
1089         sta_info_stop(local);
1090         ieee80211_wep_free(local);
1091         ieee80211_led_exit(local);
1092         kfree(local->int_scan_req);
1093 }
1094 EXPORT_SYMBOL(ieee80211_unregister_hw);
1095
1096 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1097 {
1098         WARN_ONCE(1, "Have pending ack frames!\n");
1099         kfree_skb(p);
1100         return 0;
1101 }
1102
1103 void ieee80211_free_hw(struct ieee80211_hw *hw)
1104 {
1105         struct ieee80211_local *local = hw_to_local(hw);
1106
1107         mutex_destroy(&local->iflist_mtx);
1108         mutex_destroy(&local->mtx);
1109
1110         if (local->wiphy_ciphers_allocated)
1111                 kfree(local->hw.wiphy->cipher_suites);
1112
1113         idr_for_each(&local->ack_status_frames,
1114                      ieee80211_free_ack_frame, NULL);
1115         idr_destroy(&local->ack_status_frames);
1116
1117         wiphy_free(local->hw.wiphy);
1118 }
1119 EXPORT_SYMBOL(ieee80211_free_hw);
1120
1121 static int __init ieee80211_init(void)
1122 {
1123         struct sk_buff *skb;
1124         int ret;
1125
1126         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1127         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1128                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1129
1130         ret = rc80211_minstrel_init();
1131         if (ret)
1132                 return ret;
1133
1134         ret = rc80211_minstrel_ht_init();
1135         if (ret)
1136                 goto err_minstrel;
1137
1138         ret = rc80211_pid_init();
1139         if (ret)
1140                 goto err_pid;
1141
1142         ret = ieee80211_iface_init();
1143         if (ret)
1144                 goto err_netdev;
1145
1146         return 0;
1147  err_netdev:
1148         rc80211_pid_exit();
1149  err_pid:
1150         rc80211_minstrel_ht_exit();
1151  err_minstrel:
1152         rc80211_minstrel_exit();
1153
1154         return ret;
1155 }
1156
1157 static void __exit ieee80211_exit(void)
1158 {
1159         rc80211_pid_exit();
1160         rc80211_minstrel_ht_exit();
1161         rc80211_minstrel_exit();
1162
1163         if (mesh_allocated)
1164                 ieee80211s_stop();
1165
1166         ieee80211_iface_exit();
1167
1168         rcu_barrier();
1169 }
1170
1171
1172 subsys_initcall(ieee80211_init);
1173 module_exit(ieee80211_exit);
1174
1175 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1176 MODULE_LICENSE("GPL");