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/wireless.h>
  21 #include <linux/rtnetlink.h>
  22 #include <linux/bitmap.h>
  23 #include <linux/pm_qos_params.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 #include "debugfs_netdev.h"
  36
  37 void ieee80211_configure_filter(struct ieee80211_local *local)
  38 {
  39         u64 mc;
  40         unsigned int changed_flags;
  41         unsigned int new_flags = 0;
  42
  43         if (atomic_read(&local->iff_promiscs))
  44                 new_flags |= FIF_PROMISC_IN_BSS;
  45
  46         if (atomic_read(&local->iff_allmultis))
  47                 new_flags |= FIF_ALLMULTI;
  48
  49         if (local->monitors || local->scanning)
  50                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  51
  52         if (local->fif_fcsfail)
  53                 new_flags |= FIF_FCSFAIL;
  54
  55         if (local->fif_plcpfail)
  56                 new_flags |= FIF_PLCPFAIL;
  57
  58         if (local->fif_control)
  59                 new_flags |= FIF_CONTROL;
  60
  61         if (local->fif_other_bss)
  62                 new_flags |= FIF_OTHER_BSS;
  63
  64         if (local->fif_pspoll)
  65                 new_flags |= FIF_PSPOLL;
  66
  67         spin_lock_bh(&local->filter_lock);
  68         changed_flags = local->filter_flags ^ new_flags;
  69
  70         mc = drv_prepare_multicast(local, local->mc_count, local->mc_list);
  71         spin_unlock_bh(&local->filter_lock);
  72
  73         /* be a bit nasty */
  74         new_flags |= (1<<31);
  75
  76         drv_configure_filter(local, changed_flags, &new_flags, mc);
  77
  78         WARN_ON(new_flags & (1<<31));
  79
  80         local->filter_flags = new_flags & ~(1<<31);
  81 }
  82
  83 static void ieee80211_reconfig_filter(struct work_struct *work)
  84 {
  85         struct ieee80211_local *local =
  86                 container_of(work, struct ieee80211_local, reconfig_filter);
  87
  88         ieee80211_configure_filter(local);
  89 }
  90
  91 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
  92 {
  93         struct ieee80211_channel *chan, *scan_chan;
  94         int ret = 0;
  95         int power;
  96         enum nl80211_channel_type channel_type;
  97
  98         might_sleep();
  99
 100         scan_chan = local->scan_channel;
 101
 102         if (scan_chan) {
 103                 chan = scan_chan;
 104                 channel_type = NL80211_CHAN_NO_HT;
 105         } else {
 106                 chan = local->oper_channel;
 107                 channel_type = local->oper_channel_type;
 108         }
 109
 110         if (chan != local->hw.conf.channel ||
 111             channel_type != local->hw.conf.channel_type) {
 112                 local->hw.conf.channel = chan;
 113                 local->hw.conf.channel_type = channel_type;
 114                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 115         }
 116
 117         if (scan_chan)
 118                 power = chan->max_power;
 119         else
 120                 power = local->power_constr_level ?
 121                         (chan->max_power - local->power_constr_level) :
 122                         chan->max_power;
 123
 124         if (local->user_power_level >= 0)
 125                 power = min(power, local->user_power_level);
 126
 127         if (local->hw.conf.power_level != power) {
 128                 changed |= IEEE80211_CONF_CHANGE_POWER;
 129                 local->hw.conf.power_level = power;
 130         }
 131
 132         if (changed && local->open_count) {
 133                 ret = drv_config(local, changed);
 134                 /*
 135                  * Goal:
 136                  * HW reconfiguration should never fail, the driver has told
 137                  * us what it can support so it should live up to that promise.
 138                  *
 139                  * Current status:
 140                  * rfkill is not integrated with mac80211 and a
 141                  * configuration command can thus fail if hardware rfkill
 142                  * is enabled
 143                  *
 144                  * FIXME: integrate rfkill with mac80211 and then add this
 145                  * WARN_ON() back
 146                  *
 147                  */
 148                 /* WARN_ON(ret); */
 149         }
 150
 151         return ret;
 152 }
 153
 154 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 155                                       u32 changed)
 156 {
 157         struct ieee80211_local *local = sdata->local;
 158         static const u8 zero[ETH_ALEN] = { 0 };
 159
 160         if (!changed)
 161                 return;
 162
 163         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 164                 /*
 165                  * While not associated, claim a BSSID of all-zeroes
 166                  * so that drivers don't do any weird things with the
 167                  * BSSID at that time.
 168                  */
 169                 if (sdata->vif.bss_conf.assoc)
 170                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 171                 else
 172                         sdata->vif.bss_conf.bssid = zero;
 173         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 174                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 175         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 176                 sdata->vif.bss_conf.bssid = sdata->dev->dev_addr;
 177         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 178                 sdata->vif.bss_conf.bssid = zero;
 179         } else {
 180                 WARN_ON(1);
 181                 return;
 182         }
 183
 184         switch (sdata->vif.type) {
 185         case NL80211_IFTYPE_AP:
 186         case NL80211_IFTYPE_ADHOC:
 187         case NL80211_IFTYPE_MESH_POINT:
 188                 break;
 189         default:
 190                 /* do not warn to simplify caller in scan.c */
 191                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 192                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 193                         return;
 194                 break;
 195         }
 196
 197         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 198                 if (local->quiescing || !netif_running(sdata->dev) ||
 199                     test_bit(SCAN_SW_SCANNING, &local->scanning)) {
 200                         sdata->vif.bss_conf.enable_beacon = false;
 201                 } else {
 202                         /*
 203                          * Beacon should be enabled, but AP mode must
 204                          * check whether there is a beacon configured.
 205                          */
 206                         switch (sdata->vif.type) {
 207                         case NL80211_IFTYPE_AP:
 208                                 sdata->vif.bss_conf.enable_beacon =
 209                                         !!rcu_dereference(sdata->u.ap.beacon);
 210                                 break;
 211                         case NL80211_IFTYPE_ADHOC:
 212                                 sdata->vif.bss_conf.enable_beacon =
 213                                         !!rcu_dereference(sdata->u.ibss.presp);
 214                                 break;
 215                         case NL80211_IFTYPE_MESH_POINT:
 216                                 sdata->vif.bss_conf.enable_beacon = true;
 217                                 break;
 218                         default:
 219                                 /* not reached */
 220                                 WARN_ON(1);
 221                                 break;
 222                         }
 223                 }
 224         }
 225
 226         drv_bss_info_changed(local, &sdata->vif,
 227                              &sdata->vif.bss_conf, changed);
 228 }
 229
 230 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 231 {
 232         sdata->vif.bss_conf.use_cts_prot = false;
 233         sdata->vif.bss_conf.use_short_preamble = false;
 234         sdata->vif.bss_conf.use_short_slot = false;
 235         return BSS_CHANGED_ERP_CTS_PROT |
 236                BSS_CHANGED_ERP_PREAMBLE |
 237                BSS_CHANGED_ERP_SLOT;
 238 }
 239
 240 static void ieee80211_tasklet_handler(unsigned long data)
 241 {
 242         struct ieee80211_local *local = (struct ieee80211_local *) data;
 243         struct sk_buff *skb;
 244         struct ieee80211_ra_tid *ra_tid;
 245
 246         while ((skb = skb_dequeue(&local->skb_queue)) ||
 247                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 248                 switch (skb->pkt_type) {
 249                 case IEEE80211_RX_MSG:
 250                         /* Clear skb->pkt_type in order to not confuse kernel
 251                          * netstack. */
 252                         skb->pkt_type = 0;
 253                         ieee80211_rx(local_to_hw(local), skb);
 254                         break;
 255                 case IEEE80211_TX_STATUS_MSG:
 256                         skb->pkt_type = 0;
 257                         ieee80211_tx_status(local_to_hw(local), skb);
 258                         break;
 259                 case IEEE80211_DELBA_MSG:
 260                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 261                         ieee80211_stop_tx_ba_cb(ra_tid->vif, ra_tid->ra,
 262                                                 ra_tid->tid);
 263                         dev_kfree_skb(skb);
 264                         break;
 265                 case IEEE80211_ADDBA_MSG:
 266                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 267                         ieee80211_start_tx_ba_cb(ra_tid->vif, ra_tid->ra,
 268                                                  ra_tid->tid);
 269                         dev_kfree_skb(skb);
 270                         break ;
 271                 default:
 272                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 273                              skb->pkt_type);
 274                         dev_kfree_skb(skb);
 275                         break;
 276                 }
 277         }
 278 }
 279
 280 static void ieee80211_restart_work(struct work_struct *work)
 281 {
 282         struct ieee80211_local *local =
 283                 container_of(work, struct ieee80211_local, restart_work);
 284
 285         rtnl_lock();
 286         ieee80211_reconfig(local);
 287         rtnl_unlock();
 288 }
 289
 290 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 291 {
 292         struct ieee80211_local *local = hw_to_local(hw);
 293
 294         /* use this reason, __ieee80211_resume will unblock it */
 295         ieee80211_stop_queues_by_reason(hw,
 296                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 297
 298         schedule_work(&local->restart_work);
 299 }
 300 EXPORT_SYMBOL(ieee80211_restart_hw);
 301
 302 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 303                                         const struct ieee80211_ops *ops)
 304 {
 305         struct ieee80211_local *local;
 306         int priv_size, i;
 307         struct wiphy *wiphy;
 308
 309         /* Ensure 32-byte alignment of our private data and hw private data.
 310          * We use the wiphy priv data for both our ieee80211_local and for
 311          * the driver's private data
 312          *
 313          * In memory it'll be like this:
 314          *
 315          * +-------------------------+
 316          * | struct wiphy           |
 317          * +-------------------------+
 318          * | struct ieee80211_local  |
 319          * +-------------------------+
 320          * | driver's private data   |
 321          * +-------------------------+
 322          *
 323          */
 324         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 325
 326         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 327
 328         if (!wiphy)
 329                 return NULL;
 330
 331         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 332                         WIPHY_FLAG_4ADDR_AP |
 333                         WIPHY_FLAG_4ADDR_STATION;
 334         wiphy->privid = mac80211_wiphy_privid;
 335
 336         /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
 337         wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
 338                                sizeof(struct cfg80211_bss);
 339
 340         local = wiphy_priv(wiphy);
 341
 342         local->hw.wiphy = wiphy;
 343
 344         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 345
 346         BUG_ON(!ops->tx);
 347         BUG_ON(!ops->start);
 348         BUG_ON(!ops->stop);
 349         BUG_ON(!ops->config);
 350         BUG_ON(!ops->add_interface);
 351         BUG_ON(!ops->remove_interface);
 352         BUG_ON(!ops->configure_filter);
 353         local->ops = ops;
 354
 355         /* set up some defaults */
 356         local->hw.queues = 1;
 357         local->hw.max_rates = 1;
 358         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 359         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 360         local->user_power_level = -1;
 361
 362         INIT_LIST_HEAD(&local->interfaces);
 363         mutex_init(&local->iflist_mtx);
 364         mutex_init(&local->scan_mtx);
 365
 366         spin_lock_init(&local->key_lock);
 367         spin_lock_init(&local->filter_lock);
 368         spin_lock_init(&local->queue_stop_reason_lock);
 369
 370         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 371
 372         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 373
 374         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 375
 376         INIT_WORK(&local->dynamic_ps_enable_work,
 377                   ieee80211_dynamic_ps_enable_work);
 378         INIT_WORK(&local->dynamic_ps_disable_work,
 379                   ieee80211_dynamic_ps_disable_work);
 380         setup_timer(&local->dynamic_ps_timer,
 381                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 382
 383         sta_info_init(local);
 384
 385         for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
 386                 skb_queue_head_init(&local->pending[i]);
 387         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 388                      (unsigned long)local);
 389
 390         tasklet_init(&local->tasklet,
 391                      ieee80211_tasklet_handler,
 392                      (unsigned long) local);
 393
 394         skb_queue_head_init(&local->skb_queue);
 395         skb_queue_head_init(&local->skb_queue_unreliable);
 396
 397         spin_lock_init(&local->ampdu_lock);
 398
 399         return local_to_hw(local);
 400 }
 401 EXPORT_SYMBOL(ieee80211_alloc_hw);
 402
 403 int ieee80211_register_hw(struct ieee80211_hw *hw)
 404 {
 405         struct ieee80211_local *local = hw_to_local(hw);
 406         int result;
 407         enum ieee80211_band band;
 408         int channels, i, j, max_bitrates;
 409         bool supp_ht;
 410         static const u32 cipher_suites[] = {
 411                 WLAN_CIPHER_SUITE_WEP40,
 412                 WLAN_CIPHER_SUITE_WEP104,
 413                 WLAN_CIPHER_SUITE_TKIP,
 414                 WLAN_CIPHER_SUITE_CCMP,
 415
 416                 /* keep last -- depends on hw flags! */
 417                 WLAN_CIPHER_SUITE_AES_CMAC
 418         };
 419
 420         /*
 421          * generic code guarantees at least one band,
 422          * set this very early because much code assumes
 423          * that hw.conf.channel is assigned
 424          */
 425         channels = 0;
 426         max_bitrates = 0;
 427         supp_ht = false;
 428         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 429                 struct ieee80211_supported_band *sband;
 430
 431                 sband = local->hw.wiphy->bands[band];
 432                 if (!sband)
 433                         continue;
 434                 if (!local->oper_channel) {
 435                         /* init channel we're on */
 436                         local->hw.conf.channel =
 437                         local->oper_channel = &sband->channels[0];
 438                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 439                 }
 440                 channels += sband->n_channels;
 441
 442                 if (max_bitrates < sband->n_bitrates)
 443                         max_bitrates = sband->n_bitrates;
 444                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 445         }
 446
 447         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 448                                       sizeof(void *) * channels, GFP_KERNEL);
 449         if (!local->int_scan_req)
 450                 return -ENOMEM;
 451
 452         /* if low-level driver supports AP, we also support VLAN */
 453         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 454                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 455
 456         /* mac80211 always supports monitor */
 457         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 458
 459         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 460                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 461         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 462                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 463
 464         /*
 465          * Calculate scan IE length -- we need this to alloc
 466          * memory and to subtract from the driver limit. It
 467          * includes the (extended) supported rates and HT
 468          * information -- SSID is the driver's responsibility.
 469          */
 470         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
 471         if (supp_ht)
 472                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 473
 474         if (!local->ops->hw_scan) {
 475                 /* For hw_scan, driver needs to set these up. */
 476                 local->hw.wiphy->max_scan_ssids = 4;
 477                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 478         }
 479
 480         /*
 481          * If the driver supports any scan IEs, then assume the
 482          * limit includes the IEs mac80211 will add, otherwise
 483          * leave it at zero and let the driver sort it out; we
 484          * still pass our IEs to the driver but userspace will
 485          * not be allowed to in that case.
 486          */
 487         if (local->hw.wiphy->max_scan_ie_len)
 488                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 489
 490         local->hw.wiphy->cipher_suites = cipher_suites;
 491         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 492         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 493                 local->hw.wiphy->n_cipher_suites--;
 494
 495         result = wiphy_register(local->hw.wiphy);
 496         if (result < 0)
 497                 goto fail_wiphy_register;
 498
 499         /*
 500          * We use the number of queues for feature tests (QoS, HT) internally
 501          * so restrict them appropriately.
 502          */
 503         if (hw->queues > IEEE80211_MAX_QUEUES)
 504                 hw->queues = IEEE80211_MAX_QUEUES;
 505
 506         local->workqueue =
 507                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
 508         if (!local->workqueue) {
 509                 result = -ENOMEM;
 510                 goto fail_workqueue;
 511         }
 512
 513         /*
 514          * The hardware needs headroom for sending the frame,
 515          * and we need some headroom for passing the frame to monitor
 516          * interfaces, but never both at the same time.
 517          */
 518         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
 519                         sizeof(struct ieee80211_tx_status_rtap_hdr));
 520         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 521                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 522
 523         debugfs_hw_add(local);
 524
 525         if (local->hw.max_listen_interval == 0)
 526                 local->hw.max_listen_interval = 1;
 527
 528         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 529
 530         result = sta_info_start(local);
 531         if (result < 0)
 532                 goto fail_sta_info;
 533
 534         result = ieee80211_wep_init(local);
 535         if (result < 0) {
 536                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 537                        wiphy_name(local->hw.wiphy), result);
 538                 goto fail_wep;
 539         }
 540
 541         rtnl_lock();
 542
 543         result = ieee80211_init_rate_ctrl_alg(local,
 544                                               hw->rate_control_algorithm);
 545         if (result < 0) {
 546                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 547                        "algorithm\n", wiphy_name(local->hw.wiphy));
 548                 goto fail_rate;
 549         }
 550
 551         /* add one default STA interface if supported */
 552         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 553                 result = ieee80211_if_add(local, "wlan%d", NULL,
 554                                           NL80211_IFTYPE_STATION, NULL);
 555                 if (result)
 556                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 557                                wiphy_name(local->hw.wiphy));
 558         }
 559
 560         rtnl_unlock();
 561
 562         ieee80211_led_init(local);
 563
 564         /* alloc internal scan request */
 565         i = 0;
 566         local->int_scan_req->ssids = &local->scan_ssid;
 567         local->int_scan_req->n_ssids = 1;
 568         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 569                 if (!hw->wiphy->bands[band])
 570                         continue;
 571                 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
 572                         local->int_scan_req->channels[i] =
 573                                 &hw->wiphy->bands[band]->channels[j];
 574                         i++;
 575                 }
 576         }
 577         local->int_scan_req->n_channels = i;
 578
 579         local->network_latency_notifier.notifier_call =
 580                 ieee80211_max_network_latency;
 581         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 582                                      &local->network_latency_notifier);
 583
 584         if (result) {
 585                 rtnl_lock();
 586                 goto fail_pm_qos;
 587         }
 588
 589         return 0;
 590
 591  fail_pm_qos:
 592         ieee80211_led_exit(local);
 593         ieee80211_remove_interfaces(local);
 594  fail_rate:
 595         rtnl_unlock();
 596         ieee80211_wep_free(local);
 597  fail_wep:
 598         sta_info_stop(local);
 599  fail_sta_info:
 600         destroy_workqueue(local->workqueue);
 601  fail_workqueue:
 602         wiphy_unregister(local->hw.wiphy);
 603  fail_wiphy_register:
 604         kfree(local->int_scan_req);
 605         return result;
 606 }
 607 EXPORT_SYMBOL(ieee80211_register_hw);
 608
 609 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 610 {
 611         struct ieee80211_local *local = hw_to_local(hw);
 612
 613         tasklet_kill(&local->tx_pending_tasklet);
 614         tasklet_kill(&local->tasklet);
 615
 616         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 617                                &local->network_latency_notifier);
 618
 619         rtnl_lock();
 620
 621         /*
 622          * At this point, interface list manipulations are fine
 623          * because the driver cannot be handing us frames any
 624          * more and the tasklet is killed.
 625          */
 626         ieee80211_remove_interfaces(local);
 627
 628         rtnl_unlock();
 629
 630         cancel_work_sync(&local->reconfig_filter);
 631
 632         ieee80211_clear_tx_pending(local);
 633         sta_info_stop(local);
 634         rate_control_deinitialize(local);
 635
 636         if (skb_queue_len(&local->skb_queue) ||
 637             skb_queue_len(&local->skb_queue_unreliable))
 638                 printk(KERN_WARNING "%s: skb_queue not empty\n",
 639                        wiphy_name(local->hw.wiphy));
 640         skb_queue_purge(&local->skb_queue);
 641         skb_queue_purge(&local->skb_queue_unreliable);
 642
 643         destroy_workqueue(local->workqueue);
 644         wiphy_unregister(local->hw.wiphy);
 645         ieee80211_wep_free(local);
 646         ieee80211_led_exit(local);
 647         kfree(local->int_scan_req);
 648 }
 649 EXPORT_SYMBOL(ieee80211_unregister_hw);
 650
 651 void ieee80211_free_hw(struct ieee80211_hw *hw)
 652 {
 653         struct ieee80211_local *local = hw_to_local(hw);
 654
 655         mutex_destroy(&local->iflist_mtx);
 656         mutex_destroy(&local->scan_mtx);
 657
 658         wiphy_free(local->hw.wiphy);
 659 }
 660 EXPORT_SYMBOL(ieee80211_free_hw);
 661
 662 static int __init ieee80211_init(void)
 663 {
 664         struct sk_buff *skb;
 665         int ret;
 666
 667         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
 668         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
 669                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
 670
 671         ret = rc80211_minstrel_init();
 672         if (ret)
 673                 return ret;
 674
 675         ret = rc80211_pid_init();
 676         if (ret)
 677                 return ret;
 678
 679         ieee80211_debugfs_netdev_init();
 680
 681         return 0;
 682 }
 683
 684 static void __exit ieee80211_exit(void)
 685 {
 686         rc80211_pid_exit();
 687         rc80211_minstrel_exit();
 688
 689         /*
 690          * For key todo, it'll be empty by now but the work
 691          * might still be scheduled.
 692          */
 693         flush_scheduled_work();
 694
 695         if (mesh_allocated)
 696                 ieee80211s_stop();
 697
 698         ieee80211_debugfs_netdev_exit();
 699 }
 700
 701
 702 subsys_initcall(ieee80211_init);
 703 module_exit(ieee80211_exit);
 704
 705 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
 706 MODULE_LICENSE("GPL");