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