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_channel *chan;
  99         u32 changed = 0;
 100         int power;
 101         enum nl80211_channel_type channel_type;
 102         u32 offchannel_flag;
 103
 104         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 105         if (local->scan_channel) {
 106                 chan = local->scan_channel;
 107                 /* If scanning on oper channel, use whatever channel-type
 108                  * is currently in use.
 109                  */
 110                 if (chan == local->_oper_channel)
 111                         channel_type = local->_oper_channel_type;
 112                 else
 113                         channel_type = NL80211_CHAN_NO_HT;
 114         } else if (local->tmp_channel) {
 115                 chan = local->tmp_channel;
 116                 channel_type = local->tmp_channel_type;
 117         } else {
 118                 chan = local->_oper_channel;
 119                 channel_type = local->_oper_channel_type;
 120         }
 121
 122         if (chan != local->_oper_channel ||
 123             channel_type != local->_oper_channel_type)
 124                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 125         else
 126                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 127
 128         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 129
 130         if (offchannel_flag || chan != local->hw.conf.channel ||
 131             channel_type != local->hw.conf.channel_type) {
 132                 local->hw.conf.channel = chan;
 133                 local->hw.conf.channel_type = channel_type;
 134                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 135         }
 136
 137         if (!conf_is_ht(&local->hw.conf)) {
 138                 /*
 139                  * mac80211.h documents that this is only valid
 140                  * when the channel is set to an HT type, and
 141                  * that otherwise STATIC is used.
 142                  */
 143                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 144         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 145                 local->hw.conf.smps_mode = local->smps_mode;
 146                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 147         }
 148
 149         if (test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 150             test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning) ||
 151             test_bit(SCAN_HW_SCANNING, &local->scanning) ||
 152             !local->ap_power_level)
 153                 power = chan->max_power;
 154         else
 155                 power = min(chan->max_power, local->ap_power_level);
 156
 157         if (local->user_power_level >= 0)
 158                 power = min(power, local->user_power_level);
 159
 160         if (local->hw.conf.power_level != power) {
 161                 changed |= IEEE80211_CONF_CHANGE_POWER;
 162                 local->hw.conf.power_level = power;
 163         }
 164
 165         return changed;
 166 }
 167
 168 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
 169 {
 170         int ret = 0;
 171
 172         might_sleep();
 173
 174         if (!local->use_chanctx)
 175                 changed |= ieee80211_hw_conf_chan(local);
 176         else
 177                 changed &= ~(IEEE80211_CONF_CHANGE_CHANNEL |
 178                              IEEE80211_CONF_CHANGE_POWER);
 179
 180         if (changed && local->open_count) {
 181                 ret = drv_config(local, changed);
 182                 /*
 183                  * Goal:
 184                  * HW reconfiguration should never fail, the driver has told
 185                  * us what it can support so it should live up to that promise.
 186                  *
 187                  * Current status:
 188                  * rfkill is not integrated with mac80211 and a
 189                  * configuration command can thus fail if hardware rfkill
 190                  * is enabled
 191                  *
 192                  * FIXME: integrate rfkill with mac80211 and then add this
 193                  * WARN_ON() back
 194                  *
 195                  */
 196                 /* WARN_ON(ret); */
 197         }
 198
 199         return ret;
 200 }
 201
 202 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 203                                       u32 changed)
 204 {
 205         struct ieee80211_local *local = sdata->local;
 206         static const u8 zero[ETH_ALEN] = { 0 };
 207
 208         if (!changed)
 209                 return;
 210
 211         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 212                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 213         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 214                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 215         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 216                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 217         else if (sdata->vif.type == NL80211_IFTYPE_WDS)
 218                 sdata->vif.bss_conf.bssid = NULL;
 219         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 220                 sdata->vif.bss_conf.bssid = zero;
 221         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 222                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 223                 WARN_ONCE(changed & ~(BSS_CHANGED_IDLE),
 224                           "P2P Device BSS changed %#x", changed);
 225         } else {
 226                 WARN_ON(1);
 227                 return;
 228         }
 229
 230         switch (sdata->vif.type) {
 231         case NL80211_IFTYPE_AP:
 232         case NL80211_IFTYPE_ADHOC:
 233         case NL80211_IFTYPE_WDS:
 234         case NL80211_IFTYPE_MESH_POINT:
 235                 break;
 236         default:
 237                 /* do not warn to simplify caller in scan.c */
 238                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 239                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 240                         return;
 241                 break;
 242         }
 243
 244         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 245                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
 246                     test_bit(SDATA_STATE_OFFCHANNEL, &sdata->state)) {
 247                         sdata->vif.bss_conf.enable_beacon = false;
 248                 } else {
 249                         /*
 250                          * Beacon should be enabled, but AP mode must
 251                          * check whether there is a beacon configured.
 252                          */
 253                         switch (sdata->vif.type) {
 254                         case NL80211_IFTYPE_AP:
 255                                 sdata->vif.bss_conf.enable_beacon =
 256                                         !!sdata->u.ap.beacon;
 257                                 break;
 258                         case NL80211_IFTYPE_ADHOC:
 259                                 sdata->vif.bss_conf.enable_beacon =
 260                                         !!sdata->u.ibss.presp;
 261                                 break;
 262 #ifdef CONFIG_MAC80211_MESH
 263                         case NL80211_IFTYPE_MESH_POINT:
 264                                 sdata->vif.bss_conf.enable_beacon =
 265                                         !!sdata->u.mesh.mesh_id_len;
 266                                 break;
 267 #endif
 268                         default:
 269                                 /* not reached */
 270                                 WARN_ON(1);
 271                                 break;
 272                         }
 273                 }
 274         }
 275
 276         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 277 }
 278
 279 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 280 {
 281         sdata->vif.bss_conf.use_cts_prot = false;
 282         sdata->vif.bss_conf.use_short_preamble = false;
 283         sdata->vif.bss_conf.use_short_slot = false;
 284         return BSS_CHANGED_ERP_CTS_PROT |
 285                BSS_CHANGED_ERP_PREAMBLE |
 286                BSS_CHANGED_ERP_SLOT;
 287 }
 288
 289 static void ieee80211_tasklet_handler(unsigned long data)
 290 {
 291         struct ieee80211_local *local = (struct ieee80211_local *) data;
 292         struct sta_info *sta, *tmp;
 293         struct skb_eosp_msg_data *eosp_data;
 294         struct sk_buff *skb;
 295
 296         while ((skb = skb_dequeue(&local->skb_queue)) ||
 297                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 298                 switch (skb->pkt_type) {
 299                 case IEEE80211_RX_MSG:
 300                         /* Clear skb->pkt_type in order to not confuse kernel
 301                          * netstack. */
 302                         skb->pkt_type = 0;
 303                         ieee80211_rx(&local->hw, skb);
 304                         break;
 305                 case IEEE80211_TX_STATUS_MSG:
 306                         skb->pkt_type = 0;
 307                         ieee80211_tx_status(&local->hw, skb);
 308                         break;
 309                 case IEEE80211_EOSP_MSG:
 310                         eosp_data = (void *)skb->cb;
 311                         for_each_sta_info(local, eosp_data->sta, sta, tmp) {
 312                                 /* skip wrong virtual interface */
 313                                 if (memcmp(eosp_data->iface,
 314                                            sta->sdata->vif.addr, ETH_ALEN))
 315                                         continue;
 316                                 clear_sta_flag(sta, WLAN_STA_SP);
 317                                 break;
 318                         }
 319                         dev_kfree_skb(skb);
 320                         break;
 321                 default:
 322                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 323                              skb->pkt_type);
 324                         dev_kfree_skb(skb);
 325                         break;
 326                 }
 327         }
 328 }
 329
 330 static void ieee80211_restart_work(struct work_struct *work)
 331 {
 332         struct ieee80211_local *local =
 333                 container_of(work, struct ieee80211_local, restart_work);
 334
 335         /* wait for scan work complete */
 336         flush_workqueue(local->workqueue);
 337
 338         mutex_lock(&local->mtx);
 339         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning) ||
 340              rcu_dereference_protected(local->sched_scan_sdata,
 341                                        lockdep_is_held(&local->mtx)),
 342                 "%s called with hardware scan in progress\n", __func__);
 343         mutex_unlock(&local->mtx);
 344
 345         rtnl_lock();
 346         ieee80211_scan_cancel(local);
 347         ieee80211_reconfig(local);
 348         rtnl_unlock();
 349 }
 350
 351 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 352 {
 353         struct ieee80211_local *local = hw_to_local(hw);
 354
 355         trace_api_restart_hw(local);
 356
 357         wiphy_info(hw->wiphy,
 358                    "Hardware restart was requested\n");
 359
 360         /* use this reason, ieee80211_reconfig will unblock it */
 361         ieee80211_stop_queues_by_reason(hw,
 362                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 363
 364         /*
 365          * Stop all Rx during the reconfig. We don't want state changes
 366          * or driver callbacks while this is in progress.
 367          */
 368         local->in_reconfig = true;
 369         barrier();
 370
 371         schedule_work(&local->restart_work);
 372 }
 373 EXPORT_SYMBOL(ieee80211_restart_hw);
 374
 375 #ifdef CONFIG_INET
 376 static int ieee80211_ifa_changed(struct notifier_block *nb,
 377                                  unsigned long data, void *arg)
 378 {
 379         struct in_ifaddr *ifa = arg;
 380         struct ieee80211_local *local =
 381                 container_of(nb, struct ieee80211_local,
 382                              ifa_notifier);
 383         struct net_device *ndev = ifa->ifa_dev->dev;
 384         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 385         struct in_device *idev;
 386         struct ieee80211_sub_if_data *sdata;
 387         struct ieee80211_bss_conf *bss_conf;
 388         struct ieee80211_if_managed *ifmgd;
 389         int c = 0;
 390
 391         /* Make sure it's our interface that got changed */
 392         if (!wdev)
 393                 return NOTIFY_DONE;
 394
 395         if (wdev->wiphy != local->hw.wiphy)
 396                 return NOTIFY_DONE;
 397
 398         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 399         bss_conf = &sdata->vif.bss_conf;
 400
 401         /* ARP filtering is only supported in managed mode */
 402         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 403                 return NOTIFY_DONE;
 404
 405         idev = __in_dev_get_rtnl(sdata->dev);
 406         if (!idev)
 407                 return NOTIFY_DONE;
 408
 409         ifmgd = &sdata->u.mgd;
 410         mutex_lock(&ifmgd->mtx);
 411
 412         /* Copy the addresses to the bss_conf list */
 413         ifa = idev->ifa_list;
 414         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
 415                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
 416                 ifa = ifa->ifa_next;
 417                 c++;
 418         }
 419
 420         /* If not all addresses fit the list, disable filtering */
 421         if (ifa) {
 422                 sdata->arp_filter_state = false;
 423                 c = 0;
 424         } else {
 425                 sdata->arp_filter_state = true;
 426         }
 427         bss_conf->arp_addr_cnt = c;
 428
 429         /* Configure driver only if associated (which also implies it is up) */
 430         if (ifmgd->associated) {
 431                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 432                 ieee80211_bss_info_change_notify(sdata,
 433                                                  BSS_CHANGED_ARP_FILTER);
 434         }
 435
 436         mutex_unlock(&ifmgd->mtx);
 437
 438         return NOTIFY_DONE;
 439 }
 440 #endif
 441
 442 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
 443 {
 444         struct ieee80211_local *local =
 445                 container_of(napi, struct ieee80211_local, napi);
 446
 447         return local->ops->napi_poll(&local->hw, budget);
 448 }
 449
 450 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
 451 {
 452         struct ieee80211_local *local = hw_to_local(hw);
 453
 454         napi_schedule(&local->napi);
 455 }
 456 EXPORT_SYMBOL(ieee80211_napi_schedule);
 457
 458 void ieee80211_napi_complete(struct ieee80211_hw *hw)
 459 {
 460         struct ieee80211_local *local = hw_to_local(hw);
 461
 462         napi_complete(&local->napi);
 463 }
 464 EXPORT_SYMBOL(ieee80211_napi_complete);
 465
 466 /* There isn't a lot of sense in it, but you can transmit anything you like */
 467 static const struct ieee80211_txrx_stypes
 468 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 469         [NL80211_IFTYPE_ADHOC] = {
 470                 .tx = 0xffff,
 471                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 472                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 473                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 474         },
 475         [NL80211_IFTYPE_STATION] = {
 476                 .tx = 0xffff,
 477                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 478                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 479         },
 480         [NL80211_IFTYPE_AP] = {
 481                 .tx = 0xffff,
 482                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 483                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 484                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 485                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 486                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 487                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 488                         BIT(IEEE80211_STYPE_ACTION >> 4),
 489         },
 490         [NL80211_IFTYPE_AP_VLAN] = {
 491                 /* copy AP */
 492                 .tx = 0xffff,
 493                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 494                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 495                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 496                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 497                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 498                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 499                         BIT(IEEE80211_STYPE_ACTION >> 4),
 500         },
 501         [NL80211_IFTYPE_P2P_CLIENT] = {
 502                 .tx = 0xffff,
 503                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 504                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 505         },
 506         [NL80211_IFTYPE_P2P_GO] = {
 507                 .tx = 0xffff,
 508                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 509                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 510                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 511                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 512                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 513                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 514                         BIT(IEEE80211_STYPE_ACTION >> 4),
 515         },
 516         [NL80211_IFTYPE_MESH_POINT] = {
 517                 .tx = 0xffff,
 518                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 519                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 520                         BIT(IEEE80211_STYPE_DEAUTH >> 4),
 521         },
 522         [NL80211_IFTYPE_P2P_DEVICE] = {
 523                 .tx = 0xffff,
 524                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 525                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 526         },
 527 };
 528
 529 static const struct ieee80211_ht_cap mac80211_ht_capa_mod_mask = {
 530         .ampdu_params_info = IEEE80211_HT_AMPDU_PARM_FACTOR |
 531                              IEEE80211_HT_AMPDU_PARM_DENSITY,
 532
 533         .cap_info = cpu_to_le16(IEEE80211_HT_CAP_SUP_WIDTH_20_40 |
 534                                 IEEE80211_HT_CAP_MAX_AMSDU |
 535                                 IEEE80211_HT_CAP_SGI_40),
 536         .mcs = {
 537                 .rx_mask = { 0xff, 0xff, 0xff, 0xff, 0xff,
 538                              0xff, 0xff, 0xff, 0xff, 0xff, },
 539         },
 540 };
 541
 542 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 543                                         const struct ieee80211_ops *ops)
 544 {
 545         struct ieee80211_local *local;
 546         int priv_size, i;
 547         struct wiphy *wiphy;
 548         bool use_chanctx;
 549
 550         if (WARN_ON(!ops->tx || !ops->start || !ops->stop || !ops->config ||
 551                     !ops->add_interface || !ops->remove_interface ||
 552                     !ops->configure_filter))
 553                 return NULL;
 554
 555         if (WARN_ON(ops->sta_state && (ops->sta_add || ops->sta_remove)))
 556                 return NULL;
 557
 558         /* check all or no channel context operations exist */
 559         i = !!ops->add_chanctx + !!ops->remove_chanctx +
 560             !!ops->change_chanctx + !!ops->assign_vif_chanctx +
 561             !!ops->unassign_vif_chanctx;
 562         if (WARN_ON(i != 0 && i != 5))
 563                 return NULL;
 564         use_chanctx = i == 5;
 565
 566         /* Ensure 32-byte alignment of our private data and hw private data.
 567          * We use the wiphy priv data for both our ieee80211_local and for
 568          * the driver's private data
 569          *
 570          * In memory it'll be like this:
 571          *
 572          * +-------------------------+
 573          * | struct wiphy           |
 574          * +-------------------------+
 575          * | struct ieee80211_local  |
 576          * +-------------------------+
 577          * | driver's private data   |
 578          * +-------------------------+
 579          *
 580          */
 581         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 582
 583         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 584
 585         if (!wiphy)
 586                 return NULL;
 587
 588         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 589
 590         wiphy->privid = mac80211_wiphy_privid;
 591
 592         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 593                         WIPHY_FLAG_4ADDR_AP |
 594                         WIPHY_FLAG_4ADDR_STATION |
 595                         WIPHY_FLAG_REPORTS_OBSS |
 596                         WIPHY_FLAG_OFFCHAN_TX;
 597
 598         if (ops->remain_on_channel)
 599                 wiphy->flags |= WIPHY_FLAG_HAS_REMAIN_ON_CHANNEL;
 600
 601         wiphy->features |= NL80211_FEATURE_SK_TX_STATUS |
 602                            NL80211_FEATURE_SAE |
 603                            NL80211_FEATURE_HT_IBSS;
 604
 605         if (!ops->hw_scan)
 606                 wiphy->features |= NL80211_FEATURE_LOW_PRIORITY_SCAN |
 607                                    NL80211_FEATURE_AP_SCAN;
 608
 609
 610         if (!ops->set_key)
 611                 wiphy->flags |= WIPHY_FLAG_IBSS_RSN;
 612
 613         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 614
 615         local = wiphy_priv(wiphy);
 616
 617         local->hw.wiphy = wiphy;
 618
 619         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 620
 621         local->ops = ops;
 622         local->use_chanctx = use_chanctx;
 623
 624         /* set up some defaults */
 625         local->hw.queues = 1;
 626         local->hw.max_rates = 1;
 627         local->hw.max_report_rates = 0;
 628         local->hw.max_rx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 629         local->hw.max_tx_aggregation_subframes = IEEE80211_MAX_AMPDU_BUF;
 630         local->hw.offchannel_tx_hw_queue = IEEE80211_INVAL_HW_QUEUE;
 631         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 632         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 633         local->hw.radiotap_mcs_details = IEEE80211_RADIOTAP_MCS_HAVE_MCS |
 634                                          IEEE80211_RADIOTAP_MCS_HAVE_GI |
 635                                          IEEE80211_RADIOTAP_MCS_HAVE_BW;
 636         local->user_power_level = -1;
 637         wiphy->ht_capa_mod_mask = &mac80211_ht_capa_mod_mask;
 638
 639         INIT_LIST_HEAD(&local->interfaces);
 640
 641         __hw_addr_init(&local->mc_list);
 642
 643         mutex_init(&local->iflist_mtx);
 644         mutex_init(&local->mtx);
 645
 646         mutex_init(&local->key_mtx);
 647         spin_lock_init(&local->filter_lock);
 648         spin_lock_init(&local->queue_stop_reason_lock);
 649
 650         INIT_LIST_HEAD(&local->chanctx_list);
 651         mutex_init(&local->chanctx_mtx);
 652
 653         /*
 654          * The rx_skb_queue is only accessed from tasklets,
 655          * but other SKB queues are used from within IRQ
 656          * context. Therefore, this one needs a different
 657          * locking class so our direct, non-irq-safe use of
 658          * the queue's lock doesn't throw lockdep warnings.
 659          */
 660         skb_queue_head_init_class(&local->rx_skb_queue,
 661                                   &ieee80211_rx_skb_queue_class);
 662
 663         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 664
 665         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 666
 667         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 668         local->smps_mode = IEEE80211_SMPS_OFF;
 669
 670         INIT_WORK(&local->dynamic_ps_enable_work,
 671                   ieee80211_dynamic_ps_enable_work);
 672         INIT_WORK(&local->dynamic_ps_disable_work,
 673                   ieee80211_dynamic_ps_disable_work);
 674         setup_timer(&local->dynamic_ps_timer,
 675                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 676
 677         INIT_WORK(&local->sched_scan_stopped_work,
 678                   ieee80211_sched_scan_stopped_work);
 679
 680         spin_lock_init(&local->ack_status_lock);
 681         idr_init(&local->ack_status_frames);
 682         /* preallocate at least one entry */
 683         idr_pre_get(&local->ack_status_frames, GFP_KERNEL);
 684
 685         sta_info_init(local);
 686
 687         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 688                 skb_queue_head_init(&local->pending[i]);
 689                 atomic_set(&local->agg_queue_stop[i], 0);
 690         }
 691         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 692                      (unsigned long)local);
 693
 694         tasklet_init(&local->tasklet,
 695                      ieee80211_tasklet_handler,
 696                      (unsigned long) local);
 697
 698         skb_queue_head_init(&local->skb_queue);
 699         skb_queue_head_init(&local->skb_queue_unreliable);
 700
 701         /* init dummy netdev for use w/ NAPI */
 702         init_dummy_netdev(&local->napi_dev);
 703
 704         ieee80211_led_names(local);
 705
 706         ieee80211_roc_setup(local);
 707
 708         return &local->hw;
 709 }
 710 EXPORT_SYMBOL(ieee80211_alloc_hw);
 711
 712 int ieee80211_register_hw(struct ieee80211_hw *hw)
 713 {
 714         struct ieee80211_local *local = hw_to_local(hw);
 715         int result, i;
 716         enum ieee80211_band band;
 717         int channels, max_bitrates;
 718         bool supp_ht, supp_vht;
 719         netdev_features_t feature_whitelist;
 720         static const u32 cipher_suites[] = {
 721                 /* keep WEP first, it may be removed below */
 722                 WLAN_CIPHER_SUITE_WEP40,
 723                 WLAN_CIPHER_SUITE_WEP104,
 724                 WLAN_CIPHER_SUITE_TKIP,
 725                 WLAN_CIPHER_SUITE_CCMP,
 726
 727                 /* keep last -- depends on hw flags! */
 728                 WLAN_CIPHER_SUITE_AES_CMAC
 729         };
 730
 731         if (hw->flags & IEEE80211_HW_QUEUE_CONTROL &&
 732             (local->hw.offchannel_tx_hw_queue == IEEE80211_INVAL_HW_QUEUE ||
 733              local->hw.offchannel_tx_hw_queue >= local->hw.queues))
 734                 return -EINVAL;
 735
 736 #ifdef CONFIG_PM
 737         if ((hw->wiphy->wowlan.flags || hw->wiphy->wowlan.n_patterns) &&
 738             (!local->ops->suspend || !local->ops->resume))
 739                 return -EINVAL;
 740 #endif
 741
 742         if ((hw->flags & IEEE80211_HW_SCAN_WHILE_IDLE) && !local->ops->hw_scan)
 743                 return -EINVAL;
 744
 745         if (!local->use_chanctx) {
 746                 for (i = 0; i < local->hw.wiphy->n_iface_combinations; i++) {
 747                         const struct ieee80211_iface_combination *comb;
 748
 749                         comb = &local->hw.wiphy->iface_combinations[i];
 750
 751                         if (comb->num_different_channels > 1)
 752                                 return -EINVAL;
 753                 }
 754         } else {
 755                 /*
 756                  * WDS is currently prohibited when channel contexts are used
 757                  * because there's no clear definition of which channel WDS
 758                  * type interfaces use
 759                  */
 760                 if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_WDS))
 761                         return -EINVAL;
 762         }
 763
 764         /* Only HW csum features are currently compatible with mac80211 */
 765         feature_whitelist = NETIF_F_IP_CSUM | NETIF_F_IPV6_CSUM |
 766                             NETIF_F_HW_CSUM;
 767         if (WARN_ON(hw->netdev_features & ~feature_whitelist))
 768                 return -EINVAL;
 769
 770         if (hw->max_report_rates == 0)
 771                 hw->max_report_rates = hw->max_rates;
 772
 773         local->rx_chains = 1;
 774
 775         /*
 776          * generic code guarantees at least one band,
 777          * set this very early because much code assumes
 778          * that hw.conf.channel is assigned
 779          */
 780         channels = 0;
 781         max_bitrates = 0;
 782         supp_ht = false;
 783         supp_vht = false;
 784         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 785                 struct ieee80211_supported_band *sband;
 786
 787                 sband = local->hw.wiphy->bands[band];
 788                 if (!sband)
 789                         continue;
 790                 if (!local->use_chanctx && !local->_oper_channel) {
 791                         /* init channel we're on */
 792                         local->hw.conf.channel =
 793                         local->_oper_channel = &sband->channels[0];
 794                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 795                 }
 796                 if (!local->monitor_channel) {
 797                         local->monitor_channel = &sband->channels[0];
 798                         local->monitor_channel_type = NL80211_CHAN_NO_HT;
 799                 }
 800                 channels += sband->n_channels;
 801
 802                 if (max_bitrates < sband->n_bitrates)
 803                         max_bitrates = sband->n_bitrates;
 804                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 805                 supp_vht = supp_vht || sband->vht_cap.vht_supported;
 806
 807                 if (sband->ht_cap.ht_supported)
 808                         local->rx_chains =
 809                                 max(ieee80211_mcs_to_chains(&sband->ht_cap.mcs),
 810                                     local->rx_chains);
 811
 812                 /* TODO: consider VHT for RX chains, hopefully it's the same */
 813         }
 814
 815         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 816                                       sizeof(void *) * channels, GFP_KERNEL);
 817         if (!local->int_scan_req)
 818                 return -ENOMEM;
 819
 820         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 821                 if (!local->hw.wiphy->bands[band])
 822                         continue;
 823                 local->int_scan_req->rates[band] = (u32) -1;
 824         }
 825
 826         /* if low-level driver supports AP, we also support VLAN */
 827         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP)) {
 828                 hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 829                 hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_AP_VLAN);
 830         }
 831
 832         /* mac80211 always supports monitor */
 833         hw->wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 834         hw->wiphy->software_iftypes |= BIT(NL80211_IFTYPE_MONITOR);
 835
 836         /* mac80211 doesn't support more than one IBSS interface right now */
 837         for (i = 0; i < hw->wiphy->n_iface_combinations; i++) {
 838                 const struct ieee80211_iface_combination *c;
 839                 int j;
 840
 841                 c = &hw->wiphy->iface_combinations[i];
 842
 843                 for (j = 0; j < c->n_limits; j++)
 844                         if ((c->limits[j].types & BIT(NL80211_IFTYPE_ADHOC)) &&
 845                             c->limits[j].max > 1)
 846                                 return -EINVAL;
 847         }
 848
 849 #ifndef CONFIG_MAC80211_MESH
 850         /* mesh depends on Kconfig, but drivers should set it if they want */
 851         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 852 #endif
 853
 854         /* if the underlying driver supports mesh, mac80211 will (at least)
 855          * provide routing of mesh authentication frames to userspace */
 856         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_MESH_POINT))
 857                 local->hw.wiphy->flags |= WIPHY_FLAG_MESH_AUTH;
 858
 859         /* mac80211 supports control port protocol changing */
 860         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 861
 862         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 863                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 864         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 865                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 866
 867         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 868              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 869              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 870
 871         /*
 872          * Calculate scan IE length -- we need this to alloc
 873          * memory and to subtract from the driver limit. It
 874          * includes the DS Params, (extended) supported rates, and HT
 875          * information -- SSID is the driver's responsibility.
 876          */
 877         local->scan_ies_len = 4 + max_bitrates /* (ext) supp rates */ +
 878                 3 /* DS Params */;
 879         if (supp_ht)
 880                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 881
 882         if (supp_vht)
 883                 local->scan_ies_len +=
 884                         2 + sizeof(struct ieee80211_vht_cap);
 885
 886         if (!local->ops->hw_scan) {
 887                 /* For hw_scan, driver needs to set these up. */
 888                 local->hw.wiphy->max_scan_ssids = 4;
 889                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 890         }
 891
 892         /*
 893          * If the driver supports any scan IEs, then assume the
 894          * limit includes the IEs mac80211 will add, otherwise
 895          * leave it at zero and let the driver sort it out; we
 896          * still pass our IEs to the driver but userspace will
 897          * not be allowed to in that case.
 898          */
 899         if (local->hw.wiphy->max_scan_ie_len)
 900                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 901
 902         /* Set up cipher suites unless driver already did */
 903         if (!local->hw.wiphy->cipher_suites) {
 904                 local->hw.wiphy->cipher_suites = cipher_suites;
 905                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 906                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 907                         local->hw.wiphy->n_cipher_suites--;
 908         }
 909         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 910                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 911                         local->hw.wiphy->cipher_suites += 2;
 912                         local->hw.wiphy->n_cipher_suites -= 2;
 913                 } else {
 914                         u32 *suites;
 915                         int r, w = 0;
 916
 917                         /* Filter out WEP */
 918
 919                         suites = kmemdup(
 920                                 local->hw.wiphy->cipher_suites,
 921                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 922                                 GFP_KERNEL);
 923                         if (!suites) {
 924                                 result = -ENOMEM;
 925                                 goto fail_wiphy_register;
 926                         }
 927                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 928                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 929                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 930                                     suite == WLAN_CIPHER_SUITE_WEP104)
 931                                         continue;
 932                                 suites[w++] = suite;
 933                         }
 934                         local->hw.wiphy->cipher_suites = suites;
 935                         local->hw.wiphy->n_cipher_suites = w;
 936                         local->wiphy_ciphers_allocated = true;
 937                 }
 938         }
 939
 940         if (!local->ops->remain_on_channel)
 941                 local->hw.wiphy->max_remain_on_channel_duration = 5000;
 942
 943         if (local->ops->sched_scan_start)
 944                 local->hw.wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN;
 945
 946         /* mac80211 based drivers don't support internal TDLS setup */
 947         if (local->hw.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS)
 948                 local->hw.wiphy->flags |= WIPHY_FLAG_TDLS_EXTERNAL_SETUP;
 949
 950         result = wiphy_register(local->hw.wiphy);
 951         if (result < 0)
 952                 goto fail_wiphy_register;
 953
 954         /*
 955          * We use the number of queues for feature tests (QoS, HT) internally
 956          * so restrict them appropriately.
 957          */
 958         if (hw->queues > IEEE80211_MAX_QUEUES)
 959                 hw->queues = IEEE80211_MAX_QUEUES;
 960
 961         local->workqueue =
 962                 alloc_ordered_workqueue(wiphy_name(local->hw.wiphy), 0);
 963         if (!local->workqueue) {
 964                 result = -ENOMEM;
 965                 goto fail_workqueue;
 966         }
 967
 968         /*
 969          * The hardware needs headroom for sending the frame,
 970          * and we need some headroom for passing the frame to monitor
 971          * interfaces, but never both at the same time.
 972          */
 973         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 974                                    IEEE80211_TX_STATUS_HEADROOM);
 975
 976         debugfs_hw_add(local);
 977
 978         /*
 979          * if the driver doesn't specify a max listen interval we
 980          * use 5 which should be a safe default
 981          */
 982         if (local->hw.max_listen_interval == 0)
 983                 local->hw.max_listen_interval = 5;
 984
 985         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 986
 987         local->dynamic_ps_forced_timeout = -1;
 988
 989         result = ieee80211_wep_init(local);
 990         if (result < 0)
 991                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 992                             result);
 993
 994         ieee80211_led_init(local);
 995
 996         rtnl_lock();
 997
 998         result = ieee80211_init_rate_ctrl_alg(local,
 999                                               hw->rate_control_algorithm);
1000         if (result < 0) {
1001                 wiphy_debug(local->hw.wiphy,
1002                             "Failed to initialize rate control algorithm\n");
1003                 goto fail_rate;
1004         }
1005
1006         /* add one default STA interface if supported */
1007         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
1008                 result = ieee80211_if_add(local, "wlan%d", NULL,
1009                                           NL80211_IFTYPE_STATION, NULL);
1010                 if (result)
1011                         wiphy_warn(local->hw.wiphy,
1012                                    "Failed to add default virtual iface\n");
1013         }
1014
1015         rtnl_unlock();
1016
1017         local->network_latency_notifier.notifier_call =
1018                 ieee80211_max_network_latency;
1019         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
1020                                      &local->network_latency_notifier);
1021         if (result) {
1022                 rtnl_lock();
1023                 goto fail_pm_qos;
1024         }
1025
1026 #ifdef CONFIG_INET
1027         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
1028         result = register_inetaddr_notifier(&local->ifa_notifier);
1029         if (result)
1030                 goto fail_ifa;
1031 #endif
1032
1033         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
1034                         local->hw.napi_weight);
1035
1036         return 0;
1037
1038 #ifdef CONFIG_INET
1039  fail_ifa:
1040         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1041                                &local->network_latency_notifier);
1042         rtnl_lock();
1043 #endif
1044  fail_pm_qos:
1045         ieee80211_led_exit(local);
1046         ieee80211_remove_interfaces(local);
1047  fail_rate:
1048         rtnl_unlock();
1049         ieee80211_wep_free(local);
1050         sta_info_stop(local);
1051         destroy_workqueue(local->workqueue);
1052  fail_workqueue:
1053         wiphy_unregister(local->hw.wiphy);
1054  fail_wiphy_register:
1055         if (local->wiphy_ciphers_allocated)
1056                 kfree(local->hw.wiphy->cipher_suites);
1057         kfree(local->int_scan_req);
1058         return result;
1059 }
1060 EXPORT_SYMBOL(ieee80211_register_hw);
1061
1062 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1063 {
1064         struct ieee80211_local *local = hw_to_local(hw);
1065
1066         tasklet_kill(&local->tx_pending_tasklet);
1067         tasklet_kill(&local->tasklet);
1068
1069         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
1070                                &local->network_latency_notifier);
1071 #ifdef CONFIG_INET
1072         unregister_inetaddr_notifier(&local->ifa_notifier);
1073 #endif
1074
1075         rtnl_lock();
1076
1077         /*
1078          * At this point, interface list manipulations are fine
1079          * because the driver cannot be handing us frames any
1080          * more and the tasklet is killed.
1081          */
1082         ieee80211_remove_interfaces(local);
1083
1084         rtnl_unlock();
1085
1086         cancel_work_sync(&local->restart_work);
1087         cancel_work_sync(&local->reconfig_filter);
1088
1089         ieee80211_clear_tx_pending(local);
1090         rate_control_deinitialize(local);
1091
1092         if (skb_queue_len(&local->skb_queue) ||
1093             skb_queue_len(&local->skb_queue_unreliable))
1094                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
1095         skb_queue_purge(&local->skb_queue);
1096         skb_queue_purge(&local->skb_queue_unreliable);
1097         skb_queue_purge(&local->rx_skb_queue);
1098
1099         destroy_workqueue(local->workqueue);
1100         wiphy_unregister(local->hw.wiphy);
1101         sta_info_stop(local);
1102         ieee80211_wep_free(local);
1103         ieee80211_led_exit(local);
1104         kfree(local->int_scan_req);
1105 }
1106 EXPORT_SYMBOL(ieee80211_unregister_hw);
1107
1108 static int ieee80211_free_ack_frame(int id, void *p, void *data)
1109 {
1110         WARN_ONCE(1, "Have pending ack frames!\n");
1111         kfree_skb(p);
1112         return 0;
1113 }
1114
1115 void ieee80211_free_hw(struct ieee80211_hw *hw)
1116 {
1117         struct ieee80211_local *local = hw_to_local(hw);
1118
1119         mutex_destroy(&local->iflist_mtx);
1120         mutex_destroy(&local->mtx);
1121
1122         if (local->wiphy_ciphers_allocated)
1123                 kfree(local->hw.wiphy->cipher_suites);
1124
1125         idr_for_each(&local->ack_status_frames,
1126                      ieee80211_free_ack_frame, NULL);
1127         idr_destroy(&local->ack_status_frames);
1128
1129         wiphy_free(local->hw.wiphy);
1130 }
1131 EXPORT_SYMBOL(ieee80211_free_hw);
1132
1133 static int __init ieee80211_init(void)
1134 {
1135         struct sk_buff *skb;
1136         int ret;
1137
1138         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1139         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1140                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1141
1142         ret = rc80211_minstrel_init();
1143         if (ret)
1144                 return ret;
1145
1146         ret = rc80211_minstrel_ht_init();
1147         if (ret)
1148                 goto err_minstrel;
1149
1150         ret = rc80211_pid_init();
1151         if (ret)
1152                 goto err_pid;
1153
1154         ret = ieee80211_iface_init();
1155         if (ret)
1156                 goto err_netdev;
1157
1158         return 0;
1159  err_netdev:
1160         rc80211_pid_exit();
1161  err_pid:
1162         rc80211_minstrel_ht_exit();
1163  err_minstrel:
1164         rc80211_minstrel_exit();
1165
1166         return ret;
1167 }
1168
1169 static void __exit ieee80211_exit(void)
1170 {
1171         rc80211_pid_exit();
1172         rc80211_minstrel_ht_exit();
1173         rc80211_minstrel_exit();
1174
1175         if (mesh_allocated)
1176                 ieee80211s_stop();
1177
1178         ieee80211_iface_exit();
1179
1180         rcu_barrier();
1181 }
1182
1183
1184 subsys_initcall(ieee80211_init);
1185 module_exit(ieee80211_exit);
1186
1187 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1188 MODULE_LICENSE("GPL");