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_params.h>
  23 #if (LINUX_VERSION_CODE >= KERNEL_VERSION(2,6,24))
  24 #include <net/net_namespace.h>
  25 #endif
  26 #include <net/cfg80211.h>
  27
  28 #include "ieee80211_i.h"
  29 #include "driver-ops.h"
  30 #include "rate.h"
  31 #include "mesh.h"
  32 #include "wep.h"
  33 #include "led.h"
  34 #include "cfg.h"
  35 #include "debugfs.h"
  36
  37
  38 bool ieee80211_disable_40mhz_24ghz;
  39 module_param(ieee80211_disable_40mhz_24ghz, bool, 0644);
  40 MODULE_PARM_DESC(ieee80211_disable_40mhz_24ghz,
  41                  "Disable 40MHz support in the 2.4GHz band");
  42
  43 void ieee80211_configure_filter(struct ieee80211_local *local)
  44 {
  45         u64 mc;
  46         unsigned int changed_flags;
  47         unsigned int new_flags = 0;
  48
  49         if (atomic_read(&local->iff_promiscs))
  50                 new_flags |= FIF_PROMISC_IN_BSS;
  51
  52         if (atomic_read(&local->iff_allmultis))
  53                 new_flags |= FIF_ALLMULTI;
  54
  55         if (local->monitors || local->scanning)
  56                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  57
  58         if (local->fif_fcsfail)
  59                 new_flags |= FIF_FCSFAIL;
  60
  61         if (local->fif_plcpfail)
  62                 new_flags |= FIF_PLCPFAIL;
  63
  64         if (local->fif_control)
  65                 new_flags |= FIF_CONTROL;
  66
  67         if (local->fif_other_bss)
  68                 new_flags |= FIF_OTHER_BSS;
  69
  70         if (local->fif_pspoll)
  71                 new_flags |= FIF_PSPOLL;
  72
  73         spin_lock_bh(&local->filter_lock);
  74         changed_flags = local->filter_flags ^ new_flags;
  75
  76         mc = drv_prepare_multicast(local, local->mc_count, local->mc_list);
  77         spin_unlock_bh(&local->filter_lock);
  78
  79         /* be a bit nasty */
  80         new_flags |= (1<<31);
  81
  82         drv_configure_filter(local, changed_flags, &new_flags, mc);
  83
  84         WARN_ON(new_flags & (1<<31));
  85
  86         local->filter_flags = new_flags & ~(1<<31);
  87 }
  88
  89 static void ieee80211_reconfig_filter(struct work_struct *work)
  90 {
  91         struct ieee80211_local *local =
  92                 container_of(work, struct ieee80211_local, reconfig_filter);
  93
  94         ieee80211_configure_filter(local);
  95 }
  96
  97 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
  98 {
  99         struct ieee80211_channel *chan, *scan_chan;
 100         int ret = 0;
 101         int power;
 102         enum nl80211_channel_type channel_type;
 103
 104         might_sleep();
 105
 106         scan_chan = local->scan_channel;
 107
 108         if (scan_chan) {
 109                 chan = scan_chan;
 110                 channel_type = NL80211_CHAN_NO_HT;
 111         } else if (local->tmp_channel) {
 112                 chan = scan_chan = local->tmp_channel;
 113                 channel_type = local->tmp_channel_type;
 114         } else {
 115                 chan = local->oper_channel;
 116                 channel_type = local->oper_channel_type;
 117         }
 118
 119         if (chan != local->hw.conf.channel ||
 120             channel_type != local->hw.conf.channel_type) {
 121                 local->hw.conf.channel = chan;
 122                 local->hw.conf.channel_type = channel_type;
 123                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 124         }
 125
 126         if (!conf_is_ht(&local->hw.conf)) {
 127                 /*
 128                  * mac80211.h documents that this is only valid
 129                  * when the channel is set to an HT type, and
 130                  * that otherwise STATIC is used.
 131                  */
 132                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 133         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 134                 local->hw.conf.smps_mode = local->smps_mode;
 135                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 136         }
 137
 138         if (scan_chan)
 139                 power = chan->max_power;
 140         else
 141                 power = local->power_constr_level ?
 142                         (chan->max_power - local->power_constr_level) :
 143                         chan->max_power;
 144
 145         if (local->user_power_level >= 0)
 146                 power = min(power, local->user_power_level);
 147
 148         if (local->hw.conf.power_level != power) {
 149                 changed |= IEEE80211_CONF_CHANGE_POWER;
 150                 local->hw.conf.power_level = power;
 151         }
 152
 153         if (changed && local->open_count) {
 154                 ret = drv_config(local, changed);
 155                 /*
 156                  * Goal:
 157                  * HW reconfiguration should never fail, the driver has told
 158                  * us what it can support so it should live up to that promise.
 159                  *
 160                  * Current status:
 161                  * rfkill is not integrated with mac80211 and a
 162                  * configuration command can thus fail if hardware rfkill
 163                  * is enabled
 164                  *
 165                  * FIXME: integrate rfkill with mac80211 and then add this
 166                  * WARN_ON() back
 167                  *
 168                  */
 169                 /* WARN_ON(ret); */
 170         }
 171
 172         return ret;
 173 }
 174
 175 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 176                                       u32 changed)
 177 {
 178         struct ieee80211_local *local = sdata->local;
 179         static const u8 zero[ETH_ALEN] = { 0 };
 180
 181         if (!changed)
 182                 return;
 183
 184         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 185                 /*
 186                  * While not associated, claim a BSSID of all-zeroes
 187                  * so that drivers don't do any weird things with the
 188                  * BSSID at that time.
 189                  */
 190                 if (sdata->vif.bss_conf.assoc)
 191                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 192                 else
 193                         sdata->vif.bss_conf.bssid = zero;
 194         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 195                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 196         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 197                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 198         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 199                 sdata->vif.bss_conf.bssid = zero;
 200         } else {
 201                 WARN_ON(1);
 202                 return;
 203         }
 204
 205         switch (sdata->vif.type) {
 206         case NL80211_IFTYPE_AP:
 207         case NL80211_IFTYPE_ADHOC:
 208         case NL80211_IFTYPE_MESH_POINT:
 209                 break;
 210         default:
 211                 /* do not warn to simplify caller in scan.c */
 212                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 213                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 214                         return;
 215                 break;
 216         }
 217
 218         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 219                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
 220                     test_bit(SCAN_SW_SCANNING, &local->scanning)) {
 221                         sdata->vif.bss_conf.enable_beacon = false;
 222                 } else {
 223                         /*
 224                          * Beacon should be enabled, but AP mode must
 225                          * check whether there is a beacon configured.
 226                          */
 227                         switch (sdata->vif.type) {
 228                         case NL80211_IFTYPE_AP:
 229                                 sdata->vif.bss_conf.enable_beacon =
 230                                         !!rcu_dereference(sdata->u.ap.beacon);
 231                                 break;
 232                         case NL80211_IFTYPE_ADHOC:
 233                                 sdata->vif.bss_conf.enable_beacon =
 234                                         !!rcu_dereference(sdata->u.ibss.presp);
 235                                 break;
 236                         case NL80211_IFTYPE_MESH_POINT:
 237                                 sdata->vif.bss_conf.enable_beacon = true;
 238                                 break;
 239                         default:
 240                                 /* not reached */
 241                                 WARN_ON(1);
 242                                 break;
 243                         }
 244                 }
 245         }
 246
 247         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 248 }
 249
 250 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 251 {
 252         sdata->vif.bss_conf.use_cts_prot = false;
 253         sdata->vif.bss_conf.use_short_preamble = false;
 254         sdata->vif.bss_conf.use_short_slot = false;
 255         return BSS_CHANGED_ERP_CTS_PROT |
 256                BSS_CHANGED_ERP_PREAMBLE |
 257                BSS_CHANGED_ERP_SLOT;
 258 }
 259
 260 static void ieee80211_tasklet_handler(unsigned long data)
 261 {
 262         struct ieee80211_local *local = (struct ieee80211_local *) data;
 263         struct sk_buff *skb;
 264         struct ieee80211_ra_tid *ra_tid;
 265
 266         while ((skb = skb_dequeue(&local->skb_queue)) ||
 267                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 268                 switch (skb->pkt_type) {
 269                 case IEEE80211_RX_MSG:
 270                         /* Clear skb->pkt_type in order to not confuse kernel
 271                          * netstack. */
 272                         skb->pkt_type = 0;
 273                         ieee80211_rx(local_to_hw(local), skb);
 274                         break;
 275                 case IEEE80211_TX_STATUS_MSG:
 276                         skb->pkt_type = 0;
 277                         ieee80211_tx_status(local_to_hw(local), skb);
 278                         break;
 279                 case IEEE80211_DELBA_MSG:
 280                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 281                         ieee80211_stop_tx_ba_cb(ra_tid->vif, ra_tid->ra,
 282                                                 ra_tid->tid);
 283                         dev_kfree_skb(skb);
 284                         break;
 285                 case IEEE80211_ADDBA_MSG:
 286                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 287                         ieee80211_start_tx_ba_cb(ra_tid->vif, ra_tid->ra,
 288                                                  ra_tid->tid);
 289                         dev_kfree_skb(skb);
 290                         break ;
 291                 default:
 292                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 293                              skb->pkt_type);
 294                         dev_kfree_skb(skb);
 295                         break;
 296                 }
 297         }
 298 }
 299
 300 static void ieee80211_restart_work(struct work_struct *work)
 301 {
 302         struct ieee80211_local *local =
 303                 container_of(work, struct ieee80211_local, restart_work);
 304
 305         rtnl_lock();
 306         ieee80211_reconfig(local);
 307         rtnl_unlock();
 308 }
 309
 310 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 311 {
 312         struct ieee80211_local *local = hw_to_local(hw);
 313
 314         /* use this reason, __ieee80211_resume will unblock it */
 315         ieee80211_stop_queues_by_reason(hw,
 316                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 317
 318         schedule_work(&local->restart_work);
 319 }
 320 EXPORT_SYMBOL(ieee80211_restart_hw);
 321
 322 static void ieee80211_recalc_smps_work(struct work_struct *work)
 323 {
 324         struct ieee80211_local *local =
 325                 container_of(work, struct ieee80211_local, recalc_smps);
 326
 327         mutex_lock(&local->iflist_mtx);
 328         ieee80211_recalc_smps(local, NULL);
 329         mutex_unlock(&local->iflist_mtx);
 330 }
 331
 332 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 333                                         const struct ieee80211_ops *ops)
 334 {
 335         struct ieee80211_local *local;
 336         int priv_size, i;
 337         struct wiphy *wiphy;
 338
 339         /* Ensure 32-byte alignment of our private data and hw private data.
 340          * We use the wiphy priv data for both our ieee80211_local and for
 341          * the driver's private data
 342          *
 343          * In memory it'll be like this:
 344          *
 345          * +-------------------------+
 346          * | struct wiphy           |
 347          * +-------------------------+
 348          * | struct ieee80211_local  |
 349          * +-------------------------+
 350          * | driver's private data   |
 351          * +-------------------------+
 352          *
 353          */
 354         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 355
 356         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 357
 358         if (!wiphy)
 359                 return NULL;
 360
 361         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 362                         WIPHY_FLAG_4ADDR_AP |
 363                         WIPHY_FLAG_4ADDR_STATION;
 364         wiphy->privid = mac80211_wiphy_privid;
 365
 366         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 367
 368         local = wiphy_priv(wiphy);
 369
 370         local->hw.wiphy = wiphy;
 371
 372         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 373
 374         BUG_ON(!ops->tx);
 375         BUG_ON(!ops->start);
 376         BUG_ON(!ops->stop);
 377         BUG_ON(!ops->config);
 378         BUG_ON(!ops->add_interface);
 379         BUG_ON(!ops->remove_interface);
 380         BUG_ON(!ops->configure_filter);
 381         local->ops = ops;
 382
 383         /* set up some defaults */
 384         local->hw.queues = 1;
 385         local->hw.max_rates = 1;
 386         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 387         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 388         local->user_power_level = -1;
 389         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 390         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 391
 392         INIT_LIST_HEAD(&local->interfaces);
 393         mutex_init(&local->iflist_mtx);
 394         mutex_init(&local->scan_mtx);
 395
 396         spin_lock_init(&local->key_lock);
 397         spin_lock_init(&local->filter_lock);
 398         spin_lock_init(&local->queue_stop_reason_lock);
 399
 400         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 401
 402         ieee80211_work_init(local);
 403
 404         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 405
 406         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 407         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
 408         local->smps_mode = IEEE80211_SMPS_OFF;
 409
 410         INIT_WORK(&local->dynamic_ps_enable_work,
 411                   ieee80211_dynamic_ps_enable_work);
 412         INIT_WORK(&local->dynamic_ps_disable_work,
 413                   ieee80211_dynamic_ps_disable_work);
 414         setup_timer(&local->dynamic_ps_timer,
 415                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 416
 417         sta_info_init(local);
 418
 419         for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
 420                 skb_queue_head_init(&local->pending[i]);
 421         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 422                      (unsigned long)local);
 423
 424         tasklet_init(&local->tasklet,
 425                      ieee80211_tasklet_handler,
 426                      (unsigned long) local);
 427
 428         skb_queue_head_init(&local->skb_queue);
 429         skb_queue_head_init(&local->skb_queue_unreliable);
 430
 431         spin_lock_init(&local->ampdu_lock);
 432
 433         return local_to_hw(local);
 434 }
 435 EXPORT_SYMBOL(ieee80211_alloc_hw);
 436
 437 int ieee80211_register_hw(struct ieee80211_hw *hw)
 438 {
 439         struct ieee80211_local *local = hw_to_local(hw);
 440         int result;
 441         enum ieee80211_band band;
 442         int channels, i, j, max_bitrates;
 443         bool supp_ht;
 444         static const u32 cipher_suites[] = {
 445                 WLAN_CIPHER_SUITE_WEP40,
 446                 WLAN_CIPHER_SUITE_WEP104,
 447                 WLAN_CIPHER_SUITE_TKIP,
 448                 WLAN_CIPHER_SUITE_CCMP,
 449
 450                 /* keep last -- depends on hw flags! */
 451                 WLAN_CIPHER_SUITE_AES_CMAC
 452         };
 453
 454         /*
 455          * generic code guarantees at least one band,
 456          * set this very early because much code assumes
 457          * that hw.conf.channel is assigned
 458          */
 459         channels = 0;
 460         max_bitrates = 0;
 461         supp_ht = false;
 462         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 463                 struct ieee80211_supported_band *sband;
 464
 465                 sband = local->hw.wiphy->bands[band];
 466                 if (!sband)
 467                         continue;
 468                 if (!local->oper_channel) {
 469                         /* init channel we're on */
 470                         local->hw.conf.channel =
 471                         local->oper_channel = &sband->channels[0];
 472                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 473                 }
 474                 channels += sband->n_channels;
 475
 476                 if (max_bitrates < sband->n_bitrates)
 477                         max_bitrates = sband->n_bitrates;
 478                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 479         }
 480
 481         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 482                                       sizeof(void *) * channels, GFP_KERNEL);
 483         if (!local->int_scan_req)
 484                 return -ENOMEM;
 485
 486         /* if low-level driver supports AP, we also support VLAN */
 487         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 488                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 489
 490         /* mac80211 always supports monitor */
 491         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 492
 493         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 494                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 495         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 496                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 497
 498         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 499              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 500              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 501
 502         /*
 503          * Calculate scan IE length -- we need this to alloc
 504          * memory and to subtract from the driver limit. It
 505          * includes the (extended) supported rates and HT
 506          * information -- SSID is the driver's responsibility.
 507          */
 508         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
 509         if (supp_ht)
 510                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 511
 512         if (!local->ops->hw_scan) {
 513                 /* For hw_scan, driver needs to set these up. */
 514                 local->hw.wiphy->max_scan_ssids = 4;
 515                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 516         }
 517
 518         /*
 519          * If the driver supports any scan IEs, then assume the
 520          * limit includes the IEs mac80211 will add, otherwise
 521          * leave it at zero and let the driver sort it out; we
 522          * still pass our IEs to the driver but userspace will
 523          * not be allowed to in that case.
 524          */
 525         if (local->hw.wiphy->max_scan_ie_len)
 526                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 527
 528         local->hw.wiphy->cipher_suites = cipher_suites;
 529         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 530         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 531                 local->hw.wiphy->n_cipher_suites--;
 532
 533         result = wiphy_register(local->hw.wiphy);
 534         if (result < 0)
 535                 goto fail_wiphy_register;
 536
 537         /*
 538          * We use the number of queues for feature tests (QoS, HT) internally
 539          * so restrict them appropriately.
 540          */
 541         if (hw->queues > IEEE80211_MAX_QUEUES)
 542                 hw->queues = IEEE80211_MAX_QUEUES;
 543
 544         local->workqueue =
 545                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
 546         if (!local->workqueue) {
 547                 result = -ENOMEM;
 548                 goto fail_workqueue;
 549         }
 550
 551         /*
 552          * The hardware needs headroom for sending the frame,
 553          * and we need some headroom for passing the frame to monitor
 554          * interfaces, but never both at the same time.
 555          */
 556         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
 557                         sizeof(struct ieee80211_tx_status_rtap_hdr));
 558         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 559                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 560
 561         debugfs_hw_add(local);
 562
 563         /*
 564          * if the driver doesn't specify a max listen interval we
 565          * use 5 which should be a safe default
 566          */
 567         if (local->hw.max_listen_interval == 0)
 568                 local->hw.max_listen_interval = 5;
 569
 570         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 571
 572         result = sta_info_start(local);
 573         if (result < 0)
 574                 goto fail_sta_info;
 575
 576         result = ieee80211_wep_init(local);
 577         if (result < 0) {
 578                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 579                        wiphy_name(local->hw.wiphy), result);
 580                 goto fail_wep;
 581         }
 582
 583         rtnl_lock();
 584
 585         result = ieee80211_init_rate_ctrl_alg(local,
 586                                               hw->rate_control_algorithm);
 587         if (result < 0) {
 588                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 589                        "algorithm\n", wiphy_name(local->hw.wiphy));
 590                 goto fail_rate;
 591         }
 592
 593         /* add one default STA interface if supported */
 594         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 595                 result = ieee80211_if_add(local, "wlan%d", NULL,
 596                                           NL80211_IFTYPE_STATION, NULL);
 597                 if (result)
 598                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 599                                wiphy_name(local->hw.wiphy));
 600         }
 601
 602         rtnl_unlock();
 603
 604         ieee80211_led_init(local);
 605
 606         /* alloc internal scan request */
 607         i = 0;
 608         local->int_scan_req->ssids = &local->scan_ssid;
 609         local->int_scan_req->n_ssids = 1;
 610         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 611                 if (!hw->wiphy->bands[band])
 612                         continue;
 613                 for (j = 0; j < hw->wiphy->bands[band]->n_channels; j++) {
 614                         local->int_scan_req->channels[i] =
 615                                 &hw->wiphy->bands[band]->channels[j];
 616                         i++;
 617                 }
 618         }
 619         local->int_scan_req->n_channels = i;
 620
 621         local->network_latency_notifier.notifier_call =
 622                 ieee80211_max_network_latency;
 623         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 624                                      &local->network_latency_notifier);
 625
 626         if (result) {
 627                 rtnl_lock();
 628                 goto fail_pm_qos;
 629         }
 630
 631         return 0;
 632
 633  fail_pm_qos:
 634         ieee80211_led_exit(local);
 635         ieee80211_remove_interfaces(local);
 636  fail_rate:
 637         rtnl_unlock();
 638         ieee80211_wep_free(local);
 639  fail_wep:
 640         sta_info_stop(local);
 641  fail_sta_info:
 642         destroy_workqueue(local->workqueue);
 643  fail_workqueue:
 644         wiphy_unregister(local->hw.wiphy);
 645  fail_wiphy_register:
 646         kfree(local->int_scan_req);
 647         return result;
 648 }
 649 EXPORT_SYMBOL(ieee80211_register_hw);
 650
 651 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 652 {
 653         struct ieee80211_local *local = hw_to_local(hw);
 654
 655         tasklet_kill(&local->tx_pending_tasklet);
 656         tasklet_kill(&local->tasklet);
 657
 658         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 659                                &local->network_latency_notifier);
 660
 661         rtnl_lock();
 662
 663         /*
 664          * At this point, interface list manipulations are fine
 665          * because the driver cannot be handing us frames any
 666          * more and the tasklet is killed.
 667          */
 668         ieee80211_remove_interfaces(local);
 669
 670         rtnl_unlock();
 671
 672         cancel_work_sync(&local->reconfig_filter);
 673
 674         ieee80211_clear_tx_pending(local);
 675         sta_info_stop(local);
 676         rate_control_deinitialize(local);
 677
 678         if (skb_queue_len(&local->skb_queue) ||
 679             skb_queue_len(&local->skb_queue_unreliable))
 680                 printk(KERN_WARNING "%s: skb_queue not empty\n",
 681                        wiphy_name(local->hw.wiphy));
 682         skb_queue_purge(&local->skb_queue);
 683         skb_queue_purge(&local->skb_queue_unreliable);
 684
 685         destroy_workqueue(local->workqueue);
 686         wiphy_unregister(local->hw.wiphy);
 687         ieee80211_wep_free(local);
 688         ieee80211_led_exit(local);
 689         kfree(local->int_scan_req);
 690 }
 691 EXPORT_SYMBOL(ieee80211_unregister_hw);
 692
 693 void ieee80211_free_hw(struct ieee80211_hw *hw)
 694 {
 695         struct ieee80211_local *local = hw_to_local(hw);
 696
 697         mutex_destroy(&local->iflist_mtx);
 698         mutex_destroy(&local->scan_mtx);
 699
 700         wiphy_free(local->hw.wiphy);
 701 }
 702 EXPORT_SYMBOL(ieee80211_free_hw);
 703
 704 static int __init ieee80211_init(void)
 705 {
 706         struct sk_buff *skb;
 707         int ret;
 708
 709         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
 710         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
 711                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
 712
 713         ret = rc80211_minstrel_init();
 714         if (ret)
 715                 return ret;
 716
 717         ret = rc80211_pid_init();
 718         if (ret)
 719                 goto err_pid;
 720
 721         ret = ieee80211_iface_init();
 722         if (ret)
 723                 goto err_netdev;
 724
 725         return 0;
 726  err_netdev:
 727         rc80211_pid_exit();
 728  err_pid:
 729         rc80211_minstrel_exit();
 730
 731         return ret;
 732 }
 733
 734 static void __exit ieee80211_exit(void)
 735 {
 736         rc80211_pid_exit();
 737         rc80211_minstrel_exit();
 738
 739         /*
 740          * For key todo, it'll be empty by now but the work
 741          * might still be scheduled.
 742          */
 743         flush_scheduled_work();
 744
 745         if (mesh_allocated)
 746                 ieee80211s_stop();
 747
 748         ieee80211_iface_exit();
 749 }
 750
 751
 752 subsys_initcall(ieee80211_init);
 753 module_exit(ieee80211_exit);
 754
 755 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
 756 MODULE_LICENSE("GPL");