SAFE public projects git trees. - safe/jmp/linux-2.6/blob - 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
  36 void ieee80211_configure_filter(struct ieee80211_local *local)
  37 {
  38         u64 mc;
  39         unsigned int changed_flags;
  40         unsigned int new_flags = 0;
  41
  42         if (atomic_read(&local->iff_promiscs))
  43                 new_flags |= FIF_PROMISC_IN_BSS;
  44
  45         if (atomic_read(&local->iff_allmultis))
  46                 new_flags |= FIF_ALLMULTI;
  47
  48         if (local->monitors || local->scanning)
  49                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  50
  51         if (local->fif_fcsfail)
  52                 new_flags |= FIF_FCSFAIL;
  53
  54         if (local->fif_plcpfail)
  55                 new_flags |= FIF_PLCPFAIL;
  56
  57         if (local->fif_control)
  58                 new_flags |= FIF_CONTROL;
  59
  60         if (local->fif_other_bss)
  61                 new_flags |= FIF_OTHER_BSS;
  62
  63         if (local->fif_pspoll)
  64                 new_flags |= FIF_PSPOLL;
  65
  66         spin_lock_bh(&local->filter_lock);
  67         changed_flags = local->filter_flags ^ new_flags;
  68
  69         mc = drv_prepare_multicast(local, local->mc_count, local->mc_list);
  70         spin_unlock_bh(&local->filter_lock);
  71
  72         /* be a bit nasty */
  73         new_flags |= (1<<31);
  74
  75         drv_configure_filter(local, changed_flags, &new_flags, mc);
  76
  77         WARN_ON(new_flags & (1<<31));
  78
  79         local->filter_flags = new_flags & ~(1<<31);
  80 }
  81
  82 static void ieee80211_reconfig_filter(struct work_struct *work)
  83 {
  84         struct ieee80211_local *local =
  85                 container_of(work, struct ieee80211_local, reconfig_filter);
  86
  87         ieee80211_configure_filter(local);
  88 }
  89
  90 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
  91 {
  92         struct ieee80211_channel *chan, *scan_chan;
  93         int ret = 0;
  94         int power;
  95         enum nl80211_channel_type channel_type;
  96
  97         might_sleep();
  98
  99         scan_chan = local->scan_channel;
 100
 101         if (scan_chan) {
 102                 chan = scan_chan;
 103                 channel_type = NL80211_CHAN_NO_HT;
 104         } else {
 105                 chan = local->oper_channel;
 106                 channel_type = local->oper_channel_type;
 107         }
 108
 109         if (chan != local->hw.conf.channel ||
 110             channel_type != local->hw.conf.channel_type) {
 111                 local->hw.conf.channel = chan;
 112                 local->hw.conf.channel_type = channel_type;
 113                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 114         }
 115
 116         if (scan_chan)
 117                 power = chan->max_power;
 118         else
 119                 power = local->power_constr_level ?
 120                         (chan->max_power - local->power_constr_level) :
 121                         chan->max_power;
 122
 123         if (local->user_power_level >= 0)
 124                 power = min(power, local->user_power_level);
 125
 126         if (local->hw.conf.power_level != power) {
 127                 changed |= IEEE80211_CONF_CHANGE_POWER;
 128                 local->hw.conf.power_level = power;
 129         }
 130
 131         if (changed && local->open_count) {
 132                 ret = drv_config(local, changed);
 133                 /*
 134                  * Goal:
 135                  * HW reconfiguration should never fail, the driver has told
 136                  * us what it can support so it should live up to that promise.
 137                  *
 138                  * Current status:
 139                  * rfkill is not integrated with mac80211 and a
 140                  * configuration command can thus fail if hardware rfkill
 141                  * is enabled
 142                  *
 143                  * FIXME: integrate rfkill with mac80211 and then add this
 144                  * WARN_ON() back
 145                  *
 146                  */
 147                 /* WARN_ON(ret); */
 148         }
 149
 150         return ret;
 151 }
 152
 153 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 154                                       u32 changed)
 155 {
 156         struct ieee80211_local *local = sdata->local;
 157         static const u8 zero[ETH_ALEN] = { 0 };
 158
 159         if (!changed)
 160                 return;
 161
 162         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 163                 /*
 164                  * While not associated, claim a BSSID of all-zeroes
 165                  * so that drivers don't do any weird things with the
 166                  * BSSID at that time.
 167                  */
 168                 if (sdata->vif.bss_conf.assoc)
 169                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 170                 else
 171                         sdata->vif.bss_conf.bssid = zero;
 172         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 173                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 174         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 175                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 176         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 177                 sdata->vif.bss_conf.bssid = zero;
 178         } else {
 179                 WARN_ON(1);
 180                 return;
 181         }
 182
 183         switch (sdata->vif.type) {
 184         case NL80211_IFTYPE_AP:
 185         case NL80211_IFTYPE_ADHOC:
 186         case NL80211_IFTYPE_MESH_POINT:
 187                 break;
 188         default:
 189                 /* do not warn to simplify caller in scan.c */
 190                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 191                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 192                         return;
 193                 break;
 194         }
 195
 196         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 197                 if (local->quiescing || !netif_running(sdata->dev) ||
 198                     test_bit(SCAN_SW_SCANNING, &local->scanning)) {
 199                         sdata->vif.bss_conf.enable_beacon = false;
 200                 } else {
 201                         /*
 202                          * Beacon should be enabled, but AP mode must
 203                          * check whether there is a beacon configured.
 204                          */
 205                         switch (sdata->vif.type) {
 206                         case NL80211_IFTYPE_AP:
 207                                 sdata->vif.bss_conf.enable_beacon =
 208                                         !!rcu_dereference(sdata->u.ap.beacon);
 209                                 break;
 210                         case NL80211_IFTYPE_ADHOC:
 211                                 sdata->vif.bss_conf.enable_beacon =
 212                                         !!rcu_dereference(sdata->u.ibss.presp);
 213                                 break;
 214                         case NL80211_IFTYPE_MESH_POINT:
 215                                 sdata->vif.bss_conf.enable_beacon = true;
 216                                 break;
 217                         default:
 218                                 /* not reached */
 219                                 WARN_ON(1);
 220                                 break;
 221                         }
 222                 }
 223         }
 224
 225         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 226 }
 227
 228 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 229 {
 230         sdata->vif.bss_conf.use_cts_prot = false;
 231         sdata->vif.bss_conf.use_short_preamble = false;
 232         sdata->vif.bss_conf.use_short_slot = false;
 233         return BSS_CHANGED_ERP_CTS_PROT |
 234                BSS_CHANGED_ERP_PREAMBLE |
 235                BSS_CHANGED_ERP_SLOT;
 236 }
 237
 238 static void ieee80211_tasklet_handler(unsigned long data)
 239 {
 240         struct ieee80211_local *local = (struct ieee80211_local *) data;
 241         struct sk_buff *skb;
 242         struct ieee80211_ra_tid *ra_tid;
 243
 244         while ((skb = skb_dequeue(&local->skb_queue)) ||
 245                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 246                 switch (skb->pkt_type) {
 247                 case IEEE80211_RX_MSG:
 248                         /* Clear skb->pkt_type in order to not confuse kernel
 249                          * netstack. */
 250                         skb->pkt_type = 0;
 251                         ieee80211_rx(local_to_hw(local), skb);
 252                         break;
 253                 case IEEE80211_TX_STATUS_MSG:
 254                         skb->pkt_type = 0;
 255                         ieee80211_tx_status(local_to_hw(local), skb);
 256                         break;
 257                 case IEEE80211_DELBA_MSG:
 258                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 259                         ieee80211_stop_tx_ba_cb(ra_tid->vif, ra_tid->ra,
 260                                                 ra_tid->tid);
 261                         dev_kfree_skb(skb);
 262                         break;
 263                 case IEEE80211_ADDBA_MSG:
 264                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 265                         ieee80211_start_tx_ba_cb(ra_tid->vif, ra_tid->ra,
 266                                                  ra_tid->tid);
 267                         dev_kfree_skb(skb);
 268                         break ;
 269                 default:
 270                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 271                              skb->pkt_type);
 272                         dev_kfree_skb(skb);
 273                         break;
 274                 }
 275         }
 276 }
 277
 278 static void ieee80211_restart_work(struct work_struct *work)
 279 {
 280         struct ieee80211_local *local =
 281                 container_of(work, struct ieee80211_local, restart_work);
 282
 283         rtnl_lock();
 284         ieee80211_reconfig(local);
 285         rtnl_unlock();
 286 }
 287
 288 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 289 {
 290         struct ieee80211_local *local = hw_to_local(hw);
 291
 292         /* use this reason, __ieee80211_resume will unblock it */
 293         ieee80211_stop_queues_by_reason(hw,
 294                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 295
 296         schedule_work(&local->restart_work);
 297 }
 298 EXPORT_SYMBOL(ieee80211_restart_hw);
 299
 300 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 301                                         const struct ieee80211_ops *ops)
 302 {
 303         struct ieee80211_local *local;
 304         int priv_size, i;
 305         struct wiphy *wiphy;
 306
 307         /* Ensure 32-byte alignment of our private data and hw private data.
 308          * We use the wiphy priv data for both our ieee80211_local and for
 309          * the driver's private data
 310          *
 311          * In memory it'll be like this:
 312          *
 313          * +-------------------------+
 314          * | struct wiphy           |
 315          * +-------------------------+
 316          * | struct ieee80211_local  |
 317          * +-------------------------+
 318          * | driver's private data   |
 319          * +-------------------------+
 320          *
 321          */
 322         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 323
 324         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 325
 326         if (!wiphy)
 327                 return NULL;
 328
 329         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 330                         WIPHY_FLAG_4ADDR_AP |
 331                         WIPHY_FLAG_4ADDR_STATION;
 332         wiphy->privid = mac80211_wiphy_privid;
 333
 334         /* Yes, putting cfg80211_bss into ieee80211_bss is a hack */
 335         wiphy->bss_priv_size = sizeof(struct ieee80211_bss) -
 336                                sizeof(struct cfg80211_bss);
 337
 338         local = wiphy_priv(wiphy);
 339
 340         local->hw.wiphy = wiphy;
 341
 342         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 343
 344         BUG_ON(!ops->tx);
 345         BUG_ON(!ops->start);
 346         BUG_ON(!ops->stop);
 347         BUG_ON(!ops->config);
 348         BUG_ON(!ops->add_interface);
 349         BUG_ON(!ops->remove_interface);
 350         BUG_ON(!ops->configure_filter);
 351         local->ops = ops;
 352
 353         /* set up some defaults */
 354         local->hw.queues = 1;
 355         local->hw.max_rates = 1;
 356         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 357         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 358         local->user_power_level = -1;
 359
 360         INIT_LIST_HEAD(&local->interfaces);
 361         mutex_init(&local->iflist_mtx);
 362         mutex_init(&local->scan_mtx);
 363
 364         spin_lock_init(&local->key_lock);
 365         spin_lock_init(&local->filter_lock);
 366         spin_lock_init(&local->queue_stop_reason_lock);
 367
 368         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 369
 370         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 371
 372         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 373
 374         INIT_WORK(&local->dynamic_ps_enable_work,
 375                   ieee80211_dynamic_ps_enable_work);
 376         INIT_WORK(&local->dynamic_ps_disable_work,
 377                   ieee80211_dynamic_ps_disable_work);
 378         setup_timer(&local->dynamic_ps_timer,
 379                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 380
 381         sta_info_init(local);
 382
 383         for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
 384                 skb_queue_head_init(&local->pending[i]);
 385         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 386                      (unsigned long)local);
 387
 388         tasklet_init(&local->tasklet,
 389                      ieee80211_tasklet_handler,
 390                      (unsigned long) local);
 391
 392         skb_queue_head_init(&local->skb_queue);
 393         skb_queue_head_init(&local->skb_queue_unreliable);
 394
 395         spin_lock_init(&local->ampdu_lock);
 396
 397         return local_to_hw(local);
 398 }
 399 EXPORT_SYMBOL(ieee80211_alloc_hw);
 400
 401 int ieee80211_register_hw(struct ieee80211_hw *hw)
 402 {
 403         struct ieee80211_local *local = hw_to_local(hw);
 404         int result;
 405         enum ieee80211_band band;
 406         int channels, i, j, max_bitrates;
 407         bool supp_ht;
 408         static const u32 cipher_suites[] = {
 409                 WLAN_CIPHER_SUITE_WEP40,
 410                 WLAN_CIPHER_SUITE_WEP104,
 411                 WLAN_CIPHER_SUITE_TKIP,
 412                 WLAN_CIPHER_SUITE_CCMP,
 413
 414                 /* keep last -- depends on hw flags! */
 415                 WLAN_CIPHER_SUITE_AES_CMAC
 416         };
 417
 418         /*
 419          * generic code guarantees at least one band,
 420          * set this very early because much code assumes
 421          * that hw.conf.channel is assigned
 422          */
 423         channels = 0;
 424         max_bitrates = 0;
 425         supp_ht = false;
 426         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 427                 struct ieee80211_supported_band *sband;
 428
 429                 sband = local->hw.wiphy->bands[band];
 430                 if (!sband)
 431                         continue;
 432                 if (!local->oper_channel) {
 433                         /* init channel we're on */
 434                         local->hw.conf.channel =
 435                         local->oper_channel = &sband->channels[0];
 436                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 437                 }
 438                 channels += sband->n_channels;
 439
 440                 if (max_bitrates < sband->n_bitrates)
 441                         max_bitrates = sband->n_bitrates;
 442                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 443         }
 444
 445         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 446                                       sizeof(void *) * channels, GFP_KERNEL);
 447         if (!local->int_scan_req)
 448                 return -ENOMEM;
 449
 450         /* if low-level driver supports AP, we also support VLAN */
 451         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 452                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 453
 454         /* mac80211 always supports monitor */
 455         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 456
 457         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 458                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 459         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 460                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 461
 462         /*
 463          * Calculate scan IE length -- we need this to alloc
 464          * memory and to subtract from the driver limit. It
 465          * includes the (extended) supported rates and HT
 466          * information -- SSID is the driver's responsibility.
 467          */
 468         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
 469         if (supp_ht)
 470                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 471
 472         if (!local->ops->hw_scan) {
 473                 /* For hw_scan, driver needs to set these up. */
 474                 local->hw.wiphy->max_scan_ssids = 4;
 475                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 476         }
 477
 478         /*
 479          * If the driver supports any scan IEs, then assume the
 480          * limit includes the IEs mac80211 will add, otherwise
 481          * leave it at zero and let the driver sort it out; we
 482          * still pass our IEs to the driver but userspace will
 483          * not be allowed to in that case.
 484          */
 485         if (local->hw.wiphy->max_scan_ie_len)
 486                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 487
 488         local->hw.wiphy->cipher_suites = cipher_suites;
 489         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 490         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 491                 local->hw.wiphy->n_cipher_suites--;
 492
 493         result = wiphy_register(local->hw.wiphy);
 494         if (result < 0)
 495                 goto fail_wiphy_register;
 496
 497         /*
 498          * We use the number of queues for feature tests (QoS, HT) internally
 499          * so restrict them appropriately.
 500          */
 501         if (hw->queues > IEEE80211_MAX_QUEUES)
 502                 hw->queues = IEEE80211_MAX_QUEUES;
 503
 504         local->workqueue =
 505                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
 506         if (!local->workqueue) {
 507                 result = -ENOMEM;
 508                 goto fail_workqueue;
 509         }
 510
 511         /*
 512          * The hardware needs headroom for sending the frame,
 513          * and we need some headroom for passing the frame to monitor
 514          * interfaces, but never both at the same time.
 515          */
 516         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 517                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 518
 519         debugfs_hw_add(local);
 520
 521         if (local->hw.max_listen_interval == 0)
 522                 local->hw.max_listen_interval = 1;
 523
 524         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 525
 526         result = sta_info_start(local);
 527         if (result < 0)
 528                 goto fail_sta_info;
 529
 530         result = ieee80211_wep_init(local);
 531         if (result < 0) {
 532                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 533                        wiphy_name(local->hw.wiphy), result);
 534                 goto fail_wep;
 535         }
 536
 537         rtnl_lock();
 538
 539         result = ieee80211_init_rate_ctrl_alg(local,
 540                                               hw->rate_control_algorithm);
 541         if (result < 0) {
 542                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 543                        "algorithm\n", wiphy_name(local->hw.wiphy));
 544                 goto fail_rate;
 545         }
 546
 547         /* add one default STA interface if supported */
 548         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 549                 result = ieee80211_if_add(local, "wlan%d", NULL,
 550                                           NL80211_IFTYPE_STATION, NULL);
 551                 if (result)
 552                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 553                                wiphy_name(local->hw.wiphy));
 554         }
 555
 556         rtnl_unlock();
 557
 558         ieee80211_led_init(local);
 559
 560         /* alloc internal scan request */
 561         i = 0;
 562         local->int_scan_req->ssids = &local->scan_ssid;
 563         local->int_scan_req->n_ssids = 1;
 564         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 565                 if (!hw->wiphy->bands[band])
 566                         continue;
 567                 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
 568                         local->int_scan_req->channels[i] =
 569                                 &hw->wiphy->bands[band]->channels[j];
 570                         i++;
 571                 }
 572         }
 573         local->int_scan_req->n_channels = i;
 574
 575         local->network_latency_notifier.notifier_call =
 576                 ieee80211_max_network_latency;
 577         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 578                                      &local->network_latency_notifier);
 579
 580         if (result) {
 581                 rtnl_lock();
 582                 goto fail_pm_qos;
 583         }
 584
 585         return 0;
 586
 587  fail_pm_qos:
 588         ieee80211_led_exit(local);
 589         ieee80211_remove_interfaces(local);
 590  fail_rate:
 591         rtnl_unlock();
 592         ieee80211_wep_free(local);
 593  fail_wep:
 594         sta_info_stop(local);
 595  fail_sta_info:
 596         destroy_workqueue(local->workqueue);
 597  fail_workqueue:
 598         wiphy_unregister(local->hw.wiphy);
 599  fail_wiphy_register:
 600         kfree(local->int_scan_req);
 601         return result;
 602 }
 603 EXPORT_SYMBOL(ieee80211_register_hw);
 604
 605 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 606 {
 607         struct ieee80211_local *local = hw_to_local(hw);
 608
 609         tasklet_kill(&local->tx_pending_tasklet);
 610         tasklet_kill(&local->tasklet);
 611
 612         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 613                                &local->network_latency_notifier);
 614
 615         rtnl_lock();
 616
 617         /*
 618          * At this point, interface list manipulations are fine
 619          * because the driver cannot be handing us frames any
 620          * more and the tasklet is killed.
 621          */
 622         ieee80211_remove_interfaces(local);
 623
 624         rtnl_unlock();
 625
 626         cancel_work_sync(&local->reconfig_filter);
 627
 628         ieee80211_clear_tx_pending(local);
 629         sta_info_stop(local);
 630         rate_control_deinitialize(local);
 631
 632         if (skb_queue_len(&local->skb_queue) ||
 633             skb_queue_len(&local->skb_queue_unreliable))
 634                 printk(KERN_WARNING "%s: skb_queue not empty\n",
 635                        wiphy_name(local->hw.wiphy));
 636         skb_queue_purge(&local->skb_queue);
 637         skb_queue_purge(&local->skb_queue_unreliable);
 638
 639         destroy_workqueue(local->workqueue);
 640         wiphy_unregister(local->hw.wiphy);
 641         ieee80211_wep_free(local);
 642         ieee80211_led_exit(local);
 643         kfree(local->int_scan_req);
 644 }
 645 EXPORT_SYMBOL(ieee80211_unregister_hw);
 646
 647 void ieee80211_free_hw(struct ieee80211_hw *hw)
 648 {
 649         struct ieee80211_local *local = hw_to_local(hw);
 650
 651         mutex_destroy(&local->iflist_mtx);
 652         mutex_destroy(&local->scan_mtx);
 653
 654         wiphy_free(local->hw.wiphy);
 655 }
 656 EXPORT_SYMBOL(ieee80211_free_hw);
 657
 658 static int __init ieee80211_init(void)
 659 {
 660         struct sk_buff *skb;
 661         int ret;
 662
 663         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
 664         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
 665                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
 666
 667         ret = rc80211_minstrel_init();
 668         if (ret)
 669                 return ret;
 670
 671         ret = rc80211_pid_init();
 672         if (ret)
 673                 goto err_pid;
 674
 675         ret = ieee80211_iface_init();
 676         if (ret)
 677                 goto err_netdev;
 678
 679         return 0;
 680  err_netdev:
 681         rc80211_pid_exit();
 682  err_pid:
 683         rc80211_minstrel_exit();
 684
 685         return ret;
 686 }
 687
 688 static void __exit ieee80211_exit(void)
 689 {
 690         rc80211_pid_exit();
 691         rc80211_minstrel_exit();
 692
 693         /*
 694          * For key todo, it'll be empty by now but the work
 695          * might still be scheduled.
 696          */
 697         flush_scheduled_work();
 698
 699         if (mesh_allocated)
 700                 ieee80211s_stop();
 701
 702         ieee80211_iface_exit();
 703 }
 704
 705
 706 subsys_initcall(ieee80211_init);
 707 module_exit(ieee80211_exit);
 708
 709 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
 710 MODULE_LICENSE("GPL");