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_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                                         !!sdata->u.ap.beacon;
 229                                 break;
 230                         case NL80211_IFTYPE_ADHOC:
 231                                 sdata->vif.bss_conf.enable_beacon =
 232                                         !!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         trace_api_restart_hw(local);
 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 #ifdef CONFIG_INET
 333 int ieee80211_set_arp_filter(struct ieee80211_sub_if_data *sdata)
 334 {
 335         struct in_device *idev;
 336         int ret = 0;
 337
 338         BUG_ON(!sdata);
 339         ASSERT_RTNL();
 340
 341         idev = sdata->dev->ip_ptr;
 342         if (!idev)
 343                 return 0;
 344
 345         ret = drv_configure_arp_filter(sdata->local, &sdata->vif,
 346                                        idev->ifa_list);
 347         return ret;
 348 }
 349
 350 static int ieee80211_ifa_changed(struct notifier_block *nb,
 351                                  unsigned long data, void *arg)
 352 {
 353         struct in_ifaddr *ifa = arg;
 354         struct ieee80211_local *local =
 355                 container_of(nb, struct ieee80211_local,
 356                              ifa_notifier);
 357         struct net_device *ndev = ifa->ifa_dev->dev;
 358         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 359         struct ieee80211_sub_if_data *sdata;
 360         struct ieee80211_if_managed *ifmgd;
 361
 362         if (!netif_running(ndev))
 363                 return NOTIFY_DONE;
 364
 365         /* Make sure it's our interface that got changed */
 366         if (!wdev)
 367                 return NOTIFY_DONE;
 368
 369         if (wdev->wiphy != local->hw.wiphy)
 370                 return NOTIFY_DONE;
 371
 372         /* We are concerned about IP addresses only when associated */
 373         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 374
 375         /* ARP filtering is only supported in managed mode */
 376         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 377                 return NOTIFY_DONE;
 378
 379         ifmgd = &sdata->u.mgd;
 380         mutex_lock(&ifmgd->mtx);
 381         if (ifmgd->associated)
 382                 ieee80211_set_arp_filter(sdata);
 383         mutex_unlock(&ifmgd->mtx);
 384
 385         return NOTIFY_DONE;
 386 }
 387 #endif
 388
 389 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 390                                         const struct ieee80211_ops *ops)
 391 {
 392         struct ieee80211_local *local;
 393         int priv_size, i;
 394         struct wiphy *wiphy;
 395
 396         /* Ensure 32-byte alignment of our private data and hw private data.
 397          * We use the wiphy priv data for both our ieee80211_local and for
 398          * the driver's private data
 399          *
 400          * In memory it'll be like this:
 401          *
 402          * +-------------------------+
 403          * | struct wiphy           |
 404          * +-------------------------+
 405          * | struct ieee80211_local  |
 406          * +-------------------------+
 407          * | driver's private data   |
 408          * +-------------------------+
 409          *
 410          */
 411         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 412
 413         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 414
 415         if (!wiphy)
 416                 return NULL;
 417
 418         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 419                         WIPHY_FLAG_4ADDR_AP |
 420                         WIPHY_FLAG_4ADDR_STATION;
 421         wiphy->privid = mac80211_wiphy_privid;
 422
 423         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 424
 425         local = wiphy_priv(wiphy);
 426
 427         local->hw.wiphy = wiphy;
 428
 429         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 430
 431         BUG_ON(!ops->tx);
 432         BUG_ON(!ops->start);
 433         BUG_ON(!ops->stop);
 434         BUG_ON(!ops->config);
 435         BUG_ON(!ops->add_interface);
 436         BUG_ON(!ops->remove_interface);
 437         BUG_ON(!ops->configure_filter);
 438         local->ops = ops;
 439
 440         /* set up some defaults */
 441         local->hw.queues = 1;
 442         local->hw.max_rates = 1;
 443         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 444         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 445         local->user_power_level = -1;
 446         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 447         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 448
 449         INIT_LIST_HEAD(&local->interfaces);
 450
 451         __hw_addr_init(&local->mc_list);
 452
 453         mutex_init(&local->iflist_mtx);
 454         mutex_init(&local->scan_mtx);
 455
 456         mutex_init(&local->key_mtx);
 457         spin_lock_init(&local->filter_lock);
 458         spin_lock_init(&local->queue_stop_reason_lock);
 459
 460         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 461
 462         ieee80211_work_init(local);
 463
 464         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 465
 466         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 467         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
 468         local->smps_mode = IEEE80211_SMPS_OFF;
 469
 470         INIT_WORK(&local->dynamic_ps_enable_work,
 471                   ieee80211_dynamic_ps_enable_work);
 472         INIT_WORK(&local->dynamic_ps_disable_work,
 473                   ieee80211_dynamic_ps_disable_work);
 474         setup_timer(&local->dynamic_ps_timer,
 475                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 476
 477         sta_info_init(local);
 478
 479         for (i = 0; i < IEEE80211_MAX_QUEUES; i++)
 480                 skb_queue_head_init(&local->pending[i]);
 481         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 482                      (unsigned long)local);
 483
 484         tasklet_init(&local->tasklet,
 485                      ieee80211_tasklet_handler,
 486                      (unsigned long) local);
 487
 488         skb_queue_head_init(&local->skb_queue);
 489         skb_queue_head_init(&local->skb_queue_unreliable);
 490
 491         spin_lock_init(&local->ampdu_lock);
 492
 493         return local_to_hw(local);
 494 }
 495 EXPORT_SYMBOL(ieee80211_alloc_hw);
 496
 497 int ieee80211_register_hw(struct ieee80211_hw *hw)
 498 {
 499         struct ieee80211_local *local = hw_to_local(hw);
 500         int result;
 501         enum ieee80211_band band;
 502         int channels, max_bitrates;
 503         bool supp_ht;
 504         static const u32 cipher_suites[] = {
 505                 WLAN_CIPHER_SUITE_WEP40,
 506                 WLAN_CIPHER_SUITE_WEP104,
 507                 WLAN_CIPHER_SUITE_TKIP,
 508                 WLAN_CIPHER_SUITE_CCMP,
 509
 510                 /* keep last -- depends on hw flags! */
 511                 WLAN_CIPHER_SUITE_AES_CMAC
 512         };
 513
 514         /*
 515          * generic code guarantees at least one band,
 516          * set this very early because much code assumes
 517          * that hw.conf.channel is assigned
 518          */
 519         channels = 0;
 520         max_bitrates = 0;
 521         supp_ht = false;
 522         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 523                 struct ieee80211_supported_band *sband;
 524
 525                 sband = local->hw.wiphy->bands[band];
 526                 if (!sband)
 527                         continue;
 528                 if (!local->oper_channel) {
 529                         /* init channel we're on */
 530                         local->hw.conf.channel =
 531                         local->oper_channel = &sband->channels[0];
 532                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 533                 }
 534                 channels += sband->n_channels;
 535
 536                 if (max_bitrates < sband->n_bitrates)
 537                         max_bitrates = sband->n_bitrates;
 538                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 539         }
 540
 541         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 542                                       sizeof(void *) * channels, GFP_KERNEL);
 543         if (!local->int_scan_req)
 544                 return -ENOMEM;
 545
 546         /* if low-level driver supports AP, we also support VLAN */
 547         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 548                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 549
 550         /* mac80211 always supports monitor */
 551         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 552
 553         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 554                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 555         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 556                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 557
 558         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 559              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 560              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 561
 562         /*
 563          * Calculate scan IE length -- we need this to alloc
 564          * memory and to subtract from the driver limit. It
 565          * includes the (extended) supported rates and HT
 566          * information -- SSID is the driver's responsibility.
 567          */
 568         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
 569         if (supp_ht)
 570                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 571
 572         if (!local->ops->hw_scan) {
 573                 /* For hw_scan, driver needs to set these up. */
 574                 local->hw.wiphy->max_scan_ssids = 4;
 575                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 576         }
 577
 578         /*
 579          * If the driver supports any scan IEs, then assume the
 580          * limit includes the IEs mac80211 will add, otherwise
 581          * leave it at zero and let the driver sort it out; we
 582          * still pass our IEs to the driver but userspace will
 583          * not be allowed to in that case.
 584          */
 585         if (local->hw.wiphy->max_scan_ie_len)
 586                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 587
 588         local->hw.wiphy->cipher_suites = cipher_suites;
 589         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 590         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 591                 local->hw.wiphy->n_cipher_suites--;
 592
 593         result = wiphy_register(local->hw.wiphy);
 594         if (result < 0)
 595                 goto fail_wiphy_register;
 596
 597         /*
 598          * We use the number of queues for feature tests (QoS, HT) internally
 599          * so restrict them appropriately.
 600          */
 601         if (hw->queues > IEEE80211_MAX_QUEUES)
 602                 hw->queues = IEEE80211_MAX_QUEUES;
 603
 604         local->workqueue =
 605                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
 606         if (!local->workqueue) {
 607                 result = -ENOMEM;
 608                 goto fail_workqueue;
 609         }
 610
 611         /*
 612          * The hardware needs headroom for sending the frame,
 613          * and we need some headroom for passing the frame to monitor
 614          * interfaces, but never both at the same time.
 615          */
 616         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
 617                         sizeof(struct ieee80211_tx_status_rtap_hdr));
 618         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 619                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 620
 621         debugfs_hw_add(local);
 622
 623         /*
 624          * if the driver doesn't specify a max listen interval we
 625          * use 5 which should be a safe default
 626          */
 627         if (local->hw.max_listen_interval == 0)
 628                 local->hw.max_listen_interval = 5;
 629
 630         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 631
 632         local->hw.conf.dynamic_ps_forced_timeout = -1;
 633
 634         result = sta_info_start(local);
 635         if (result < 0)
 636                 goto fail_sta_info;
 637
 638         result = ieee80211_wep_init(local);
 639         if (result < 0) {
 640                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 641                        wiphy_name(local->hw.wiphy), result);
 642                 goto fail_wep;
 643         }
 644
 645         rtnl_lock();
 646
 647         result = ieee80211_init_rate_ctrl_alg(local,
 648                                               hw->rate_control_algorithm);
 649         if (result < 0) {
 650                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 651                        "algorithm\n", wiphy_name(local->hw.wiphy));
 652                 goto fail_rate;
 653         }
 654
 655         /* add one default STA interface if supported */
 656         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 657                 result = ieee80211_if_add(local, "wlan%d", NULL,
 658                                           NL80211_IFTYPE_STATION, NULL);
 659                 if (result)
 660                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 661                                wiphy_name(local->hw.wiphy));
 662         }
 663
 664         rtnl_unlock();
 665
 666         ieee80211_led_init(local);
 667
 668         local->network_latency_notifier.notifier_call =
 669                 ieee80211_max_network_latency;
 670         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 671                                      &local->network_latency_notifier);
 672         if (result) {
 673                 rtnl_lock();
 674                 goto fail_pm_qos;
 675         }
 676
 677 #ifdef CONFIG_INET
 678         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 679         result = register_inetaddr_notifier(&local->ifa_notifier);
 680         if (result)
 681                 goto fail_ifa;
 682 #endif
 683
 684         return 0;
 685
 686  fail_ifa:
 687         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 688                                &local->network_latency_notifier);
 689         rtnl_lock();
 690  fail_pm_qos:
 691         ieee80211_led_exit(local);
 692         ieee80211_remove_interfaces(local);
 693  fail_rate:
 694         rtnl_unlock();
 695         ieee80211_wep_free(local);
 696  fail_wep:
 697         sta_info_stop(local);
 698  fail_sta_info:
 699         destroy_workqueue(local->workqueue);
 700  fail_workqueue:
 701         wiphy_unregister(local->hw.wiphy);
 702  fail_wiphy_register:
 703         kfree(local->int_scan_req);
 704         return result;
 705 }
 706 EXPORT_SYMBOL(ieee80211_register_hw);
 707
 708 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 709 {
 710         struct ieee80211_local *local = hw_to_local(hw);
 711
 712         tasklet_kill(&local->tx_pending_tasklet);
 713         tasklet_kill(&local->tasklet);
 714
 715         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 716                                &local->network_latency_notifier);
 717 #ifdef CONFIG_INET
 718         unregister_inetaddr_notifier(&local->ifa_notifier);
 719 #endif
 720
 721         rtnl_lock();
 722
 723         /*
 724          * At this point, interface list manipulations are fine
 725          * because the driver cannot be handing us frames any
 726          * more and the tasklet is killed.
 727          */
 728         ieee80211_remove_interfaces(local);
 729
 730         rtnl_unlock();
 731
 732         cancel_work_sync(&local->reconfig_filter);
 733
 734         ieee80211_clear_tx_pending(local);
 735         sta_info_stop(local);
 736         rate_control_deinitialize(local);
 737
 738         if (skb_queue_len(&local->skb_queue) ||
 739             skb_queue_len(&local->skb_queue_unreliable))
 740                 printk(KERN_WARNING "%s: skb_queue not empty\n",
 741                        wiphy_name(local->hw.wiphy));
 742         skb_queue_purge(&local->skb_queue);
 743         skb_queue_purge(&local->skb_queue_unreliable);
 744
 745         destroy_workqueue(local->workqueue);
 746         wiphy_unregister(local->hw.wiphy);
 747         ieee80211_wep_free(local);
 748         ieee80211_led_exit(local);
 749         kfree(local->int_scan_req);
 750 }
 751 EXPORT_SYMBOL(ieee80211_unregister_hw);
 752
 753 void ieee80211_free_hw(struct ieee80211_hw *hw)
 754 {
 755         struct ieee80211_local *local = hw_to_local(hw);
 756
 757         mutex_destroy(&local->iflist_mtx);
 758         mutex_destroy(&local->scan_mtx);
 759
 760         wiphy_free(local->hw.wiphy);
 761 }
 762 EXPORT_SYMBOL(ieee80211_free_hw);
 763
 764 static int __init ieee80211_init(void)
 765 {
 766         struct sk_buff *skb;
 767         int ret;
 768
 769         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
 770         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
 771                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
 772
 773         ret = rc80211_minstrel_init();
 774         if (ret)
 775                 return ret;
 776
 777         ret = rc80211_minstrel_ht_init();
 778         if (ret)
 779                 goto err_minstrel;
 780
 781         ret = rc80211_pid_init();
 782         if (ret)
 783                 goto err_pid;
 784
 785         ret = ieee80211_iface_init();
 786         if (ret)
 787                 goto err_netdev;
 788
 789         return 0;
 790  err_netdev:
 791         rc80211_pid_exit();
 792  err_pid:
 793         rc80211_minstrel_ht_exit();
 794  err_minstrel:
 795         rc80211_minstrel_exit();
 796
 797         return ret;
 798 }
 799
 800 static void __exit ieee80211_exit(void)
 801 {
 802         rc80211_pid_exit();
 803         rc80211_minstrel_ht_exit();
 804         rc80211_minstrel_exit();
 805
 806         /*
 807          * For key todo, it'll be empty by now but the work
 808          * might still be scheduled.
 809          */
 810         flush_scheduled_work();
 811
 812         if (mesh_allocated)
 813                 ieee80211s_stop();
 814
 815         ieee80211_iface_exit();
 816 }
 817
 818
 819 subsys_initcall(ieee80211_init);
 820 module_exit(ieee80211_exit);
 821
 822 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
 823 MODULE_LICENSE("GPL");