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 <linux/inetdevice.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
  37 bool ieee80211_disable_40mhz_24ghz;
  38 module_param(ieee80211_disable_40mhz_24ghz, bool, 0644);
  39 MODULE_PARM_DESC(ieee80211_disable_40mhz_24ghz,
  40                  "Disable 40MHz support in the 2.4GHz band");
  41
  42 void ieee80211_configure_filter(struct ieee80211_local *local)
  43 {
  44         u64 mc;
  45         unsigned int changed_flags;
  46         unsigned int new_flags = 0;
  47
  48         if (atomic_read(&local->iff_promiscs))
  49                 new_flags |= FIF_PROMISC_IN_BSS;
  50
  51         if (atomic_read(&local->iff_allmultis))
  52                 new_flags |= FIF_ALLMULTI;
  53
  54         if (local->monitors || local->scanning)
  55                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  56
  57         if (local->fif_fcsfail)
  58                 new_flags |= FIF_FCSFAIL;
  59
  60         if (local->fif_plcpfail)
  61                 new_flags |= FIF_PLCPFAIL;
  62
  63         if (local->fif_control)
  64                 new_flags |= FIF_CONTROL;
  65
  66         if (local->fif_other_bss)
  67                 new_flags |= FIF_OTHER_BSS;
  68
  69         if (local->fif_pspoll)
  70                 new_flags |= FIF_PSPOLL;
  71
  72         spin_lock_bh(&local->filter_lock);
  73         changed_flags = local->filter_flags ^ new_flags;
  74
  75         mc = drv_prepare_multicast(local, &local->mc_list);
  76         spin_unlock_bh(&local->filter_lock);
  77
  78         /* be a bit nasty */
  79         new_flags |= (1<<31);
  80
  81         drv_configure_filter(local, changed_flags, &new_flags, mc);
  82
  83         WARN_ON(new_flags & (1<<31));
  84
  85         local->filter_flags = new_flags & ~(1<<31);
  86 }
  87
  88 static void ieee80211_reconfig_filter(struct work_struct *work)
  89 {
  90         struct ieee80211_local *local =
  91                 container_of(work, struct ieee80211_local, reconfig_filter);
  92
  93         ieee80211_configure_filter(local);
  94 }
  95
  96 int ieee80211_hw_config(struct ieee80211_local *local, u32 changed)
  97 {
  98         struct ieee80211_channel *chan, *scan_chan;
  99         int ret = 0;
 100         int power;
 101         enum nl80211_channel_type channel_type;
 102
 103         might_sleep();
 104
 105         scan_chan = local->scan_channel;
 106
 107         if (scan_chan) {
 108                 chan = scan_chan;
 109                 channel_type = NL80211_CHAN_NO_HT;
 110         } else if (local->tmp_channel) {
 111                 chan = scan_chan = local->tmp_channel;
 112                 channel_type = local->tmp_channel_type;
 113         } else {
 114                 chan = local->oper_channel;
 115                 channel_type = local->_oper_channel_type;
 116         }
 117
 118         if (chan != local->hw.conf.channel ||
 119             channel_type != local->hw.conf.channel_type) {
 120                 local->hw.conf.channel = chan;
 121                 local->hw.conf.channel_type = channel_type;
 122                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 123         }
 124
 125         if (!conf_is_ht(&local->hw.conf)) {
 126                 /*
 127                  * mac80211.h documents that this is only valid
 128                  * when the channel is set to an HT type, and
 129                  * that otherwise STATIC is used.
 130                  */
 131                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 132         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 133                 local->hw.conf.smps_mode = local->smps_mode;
 134                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 135         }
 136
 137         if (scan_chan)
 138                 power = chan->max_power;
 139         else
 140                 power = local->power_constr_level ?
 141                         (chan->max_power - local->power_constr_level) :
 142                         chan->max_power;
 143
 144         if (local->user_power_level >= 0)
 145                 power = min(power, local->user_power_level);
 146
 147         if (local->hw.conf.power_level != power) {
 148                 changed |= IEEE80211_CONF_CHANGE_POWER;
 149                 local->hw.conf.power_level = power;
 150         }
 151
 152         if (changed && local->open_count) {
 153                 ret = drv_config(local, changed);
 154                 /*
 155                  * Goal:
 156                  * HW reconfiguration should never fail, the driver has told
 157                  * us what it can support so it should live up to that promise.
 158                  *
 159                  * Current status:
 160                  * rfkill is not integrated with mac80211 and a
 161                  * configuration command can thus fail if hardware rfkill
 162                  * is enabled
 163                  *
 164                  * FIXME: integrate rfkill with mac80211 and then add this
 165                  * WARN_ON() back
 166                  *
 167                  */
 168                 /* WARN_ON(ret); */
 169         }
 170
 171         return ret;
 172 }
 173
 174 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 175                                       u32 changed)
 176 {
 177         struct ieee80211_local *local = sdata->local;
 178         static const u8 zero[ETH_ALEN] = { 0 };
 179
 180         if (!changed)
 181                 return;
 182
 183         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 184                 /*
 185                  * While not associated, claim a BSSID of all-zeroes
 186                  * so that drivers don't do any weird things with the
 187                  * BSSID at that time.
 188                  */
 189                 if (sdata->vif.bss_conf.assoc)
 190                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 191                 else
 192                         sdata->vif.bss_conf.bssid = zero;
 193         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 194                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 195         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 196                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 197         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 198                 sdata->vif.bss_conf.bssid = zero;
 199         } else {
 200                 WARN_ON(1);
 201                 return;
 202         }
 203
 204         switch (sdata->vif.type) {
 205         case NL80211_IFTYPE_AP:
 206         case NL80211_IFTYPE_ADHOC:
 207         case NL80211_IFTYPE_MESH_POINT:
 208                 break;
 209         default:
 210                 /* do not warn to simplify caller in scan.c */
 211                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 212                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 213                         return;
 214                 break;
 215         }
 216
 217         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 218                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
 219                     test_bit(SCAN_SW_SCANNING, &local->scanning)) {
 220                         sdata->vif.bss_conf.enable_beacon = false;
 221                 } else {
 222                         /*
 223                          * Beacon should be enabled, but AP mode must
 224                          * check whether there is a beacon configured.
 225                          */
 226                         switch (sdata->vif.type) {
 227                         case NL80211_IFTYPE_AP:
 228                                 sdata->vif.bss_conf.enable_beacon =
 229                                         !!sdata->u.ap.beacon;
 230                                 break;
 231                         case NL80211_IFTYPE_ADHOC:
 232                                 sdata->vif.bss_conf.enable_beacon =
 233                                         !!sdata->u.ibss.presp;
 234                                 break;
 235                         case NL80211_IFTYPE_MESH_POINT:
 236                                 sdata->vif.bss_conf.enable_beacon = true;
 237                                 break;
 238                         default:
 239                                 /* not reached */
 240                                 WARN_ON(1);
 241                                 break;
 242                         }
 243                 }
 244         }
 245
 246         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 247 }
 248
 249 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 250 {
 251         sdata->vif.bss_conf.use_cts_prot = false;
 252         sdata->vif.bss_conf.use_short_preamble = false;
 253         sdata->vif.bss_conf.use_short_slot = false;
 254         return BSS_CHANGED_ERP_CTS_PROT |
 255                BSS_CHANGED_ERP_PREAMBLE |
 256                BSS_CHANGED_ERP_SLOT;
 257 }
 258
 259 static void ieee80211_tasklet_handler(unsigned long data)
 260 {
 261         struct ieee80211_local *local = (struct ieee80211_local *) data;
 262         struct sk_buff *skb;
 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                 default:
 278                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 279                              skb->pkt_type);
 280                         dev_kfree_skb(skb);
 281                         break;
 282                 }
 283         }
 284 }
 285
 286 static void ieee80211_restart_work(struct work_struct *work)
 287 {
 288         struct ieee80211_local *local =
 289                 container_of(work, struct ieee80211_local, restart_work);
 290
 291         rtnl_lock();
 292         ieee80211_reconfig(local);
 293         rtnl_unlock();
 294 }
 295
 296 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 297 {
 298         struct ieee80211_local *local = hw_to_local(hw);
 299
 300         trace_api_restart_hw(local);
 301
 302         /* use this reason, __ieee80211_resume will unblock it */
 303         ieee80211_stop_queues_by_reason(hw,
 304                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 305
 306         schedule_work(&local->restart_work);
 307 }
 308 EXPORT_SYMBOL(ieee80211_restart_hw);
 309
 310 static void ieee80211_recalc_smps_work(struct work_struct *work)
 311 {
 312         struct ieee80211_local *local =
 313                 container_of(work, struct ieee80211_local, recalc_smps);
 314
 315         mutex_lock(&local->iflist_mtx);
 316         ieee80211_recalc_smps(local, NULL);
 317         mutex_unlock(&local->iflist_mtx);
 318 }
 319
 320 #ifdef CONFIG_INET
 321 static int ieee80211_ifa_changed(struct notifier_block *nb,
 322                                  unsigned long data, void *arg)
 323 {
 324         struct in_ifaddr *ifa = arg;
 325         struct ieee80211_local *local =
 326                 container_of(nb, struct ieee80211_local,
 327                              ifa_notifier);
 328         struct net_device *ndev = ifa->ifa_dev->dev;
 329         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 330         struct in_device *idev;
 331         struct ieee80211_sub_if_data *sdata;
 332         struct ieee80211_bss_conf *bss_conf;
 333         struct ieee80211_if_managed *ifmgd;
 334         int c = 0;
 335
 336         if (!netif_running(ndev))
 337                 return NOTIFY_DONE;
 338
 339         /* Make sure it's our interface that got changed */
 340         if (!wdev)
 341                 return NOTIFY_DONE;
 342
 343         if (wdev->wiphy != local->hw.wiphy)
 344                 return NOTIFY_DONE;
 345
 346         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 347         bss_conf = &sdata->vif.bss_conf;
 348
 349         /* ARP filtering is only supported in managed mode */
 350         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 351                 return NOTIFY_DONE;
 352
 353         idev = sdata->dev->ip_ptr;
 354         if (!idev)
 355                 return NOTIFY_DONE;
 356
 357         ifmgd = &sdata->u.mgd;
 358         mutex_lock(&ifmgd->mtx);
 359
 360         /* Copy the addresses to the bss_conf list */
 361         ifa = idev->ifa_list;
 362         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
 363                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
 364                 ifa = ifa->ifa_next;
 365                 c++;
 366         }
 367
 368         /* If not all addresses fit the list, disable filtering */
 369         if (ifa) {
 370                 sdata->arp_filter_state = false;
 371                 c = 0;
 372         } else {
 373                 sdata->arp_filter_state = true;
 374         }
 375         bss_conf->arp_addr_cnt = c;
 376
 377         /* Configure driver only if associated */
 378         if (ifmgd->associated) {
 379                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 380                 ieee80211_bss_info_change_notify(sdata,
 381                                                  BSS_CHANGED_ARP_FILTER);
 382         }
 383
 384         mutex_unlock(&ifmgd->mtx);
 385
 386         return NOTIFY_DONE;
 387 }
 388 #endif
 389
 390 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 391                                         const struct ieee80211_ops *ops)
 392 {
 393         struct ieee80211_local *local;
 394         int priv_size, i;
 395         struct wiphy *wiphy;
 396
 397         /* Ensure 32-byte alignment of our private data and hw private data.
 398          * We use the wiphy priv data for both our ieee80211_local and for
 399          * the driver's private data
 400          *
 401          * In memory it'll be like this:
 402          *
 403          * +-------------------------+
 404          * | struct wiphy           |
 405          * +-------------------------+
 406          * | struct ieee80211_local  |
 407          * +-------------------------+
 408          * | driver's private data   |
 409          * +-------------------------+
 410          *
 411          */
 412         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 413
 414         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 415
 416         if (!wiphy)
 417                 return NULL;
 418
 419         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 420                         WIPHY_FLAG_4ADDR_AP |
 421                         WIPHY_FLAG_4ADDR_STATION;
 422         wiphy->privid = mac80211_wiphy_privid;
 423
 424         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 425
 426         local = wiphy_priv(wiphy);
 427
 428         local->hw.wiphy = wiphy;
 429
 430         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 431
 432         BUG_ON(!ops->tx);
 433         BUG_ON(!ops->start);
 434         BUG_ON(!ops->stop);
 435         BUG_ON(!ops->config);
 436         BUG_ON(!ops->add_interface);
 437         BUG_ON(!ops->remove_interface);
 438         BUG_ON(!ops->configure_filter);
 439         local->ops = ops;
 440
 441         /* set up some defaults */
 442         local->hw.queues = 1;
 443         local->hw.max_rates = 1;
 444         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 445         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 446         local->user_power_level = -1;
 447         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 448         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 449
 450         INIT_LIST_HEAD(&local->interfaces);
 451
 452         __hw_addr_init(&local->mc_list);
 453
 454         mutex_init(&local->iflist_mtx);
 455         mutex_init(&local->scan_mtx);
 456
 457         mutex_init(&local->key_mtx);
 458         spin_lock_init(&local->filter_lock);
 459         spin_lock_init(&local->queue_stop_reason_lock);
 460
 461         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 462
 463         ieee80211_work_init(local);
 464
 465         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 466
 467         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 468         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
 469         local->smps_mode = IEEE80211_SMPS_OFF;
 470
 471         INIT_WORK(&local->dynamic_ps_enable_work,
 472                   ieee80211_dynamic_ps_enable_work);
 473         INIT_WORK(&local->dynamic_ps_disable_work,
 474                   ieee80211_dynamic_ps_disable_work);
 475         setup_timer(&local->dynamic_ps_timer,
 476                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 477
 478         sta_info_init(local);
 479
 480         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 481                 skb_queue_head_init(&local->pending[i]);
 482                 atomic_set(&local->agg_queue_stop[i], 0);
 483         }
 484         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 485                      (unsigned long)local);
 486
 487         tasklet_init(&local->tasklet,
 488                      ieee80211_tasklet_handler,
 489                      (unsigned long) local);
 490
 491         skb_queue_head_init(&local->skb_queue);
 492         skb_queue_head_init(&local->skb_queue_unreliable);
 493
 494         return local_to_hw(local);
 495 }
 496 EXPORT_SYMBOL(ieee80211_alloc_hw);
 497
 498 int ieee80211_register_hw(struct ieee80211_hw *hw)
 499 {
 500         struct ieee80211_local *local = hw_to_local(hw);
 501         int result;
 502         enum ieee80211_band band;
 503         int channels, max_bitrates;
 504         bool supp_ht;
 505         static const u32 cipher_suites[] = {
 506                 WLAN_CIPHER_SUITE_WEP40,
 507                 WLAN_CIPHER_SUITE_WEP104,
 508                 WLAN_CIPHER_SUITE_TKIP,
 509                 WLAN_CIPHER_SUITE_CCMP,
 510
 511                 /* keep last -- depends on hw flags! */
 512                 WLAN_CIPHER_SUITE_AES_CMAC
 513         };
 514
 515         /*
 516          * generic code guarantees at least one band,
 517          * set this very early because much code assumes
 518          * that hw.conf.channel is assigned
 519          */
 520         channels = 0;
 521         max_bitrates = 0;
 522         supp_ht = false;
 523         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 524                 struct ieee80211_supported_band *sband;
 525
 526                 sband = local->hw.wiphy->bands[band];
 527                 if (!sband)
 528                         continue;
 529                 if (!local->oper_channel) {
 530                         /* init channel we're on */
 531                         local->hw.conf.channel =
 532                         local->oper_channel = &sband->channels[0];
 533                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 534                 }
 535                 channels += sband->n_channels;
 536
 537                 if (max_bitrates < sband->n_bitrates)
 538                         max_bitrates = sband->n_bitrates;
 539                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 540         }
 541
 542         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 543                                       sizeof(void *) * channels, GFP_KERNEL);
 544         if (!local->int_scan_req)
 545                 return -ENOMEM;
 546
 547         /* if low-level driver supports AP, we also support VLAN */
 548         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 549                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 550
 551         /* mac80211 always supports monitor */
 552         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 553
 554         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 555                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 556         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 557                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 558
 559         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 560              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 561              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 562
 563         /*
 564          * Calculate scan IE length -- we need this to alloc
 565          * memory and to subtract from the driver limit. It
 566          * includes the (extended) supported rates and HT
 567          * information -- SSID is the driver's responsibility.
 568          */
 569         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
 570         if (supp_ht)
 571                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 572
 573         if (!local->ops->hw_scan) {
 574                 /* For hw_scan, driver needs to set these up. */
 575                 local->hw.wiphy->max_scan_ssids = 4;
 576                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 577         }
 578
 579         /*
 580          * If the driver supports any scan IEs, then assume the
 581          * limit includes the IEs mac80211 will add, otherwise
 582          * leave it at zero and let the driver sort it out; we
 583          * still pass our IEs to the driver but userspace will
 584          * not be allowed to in that case.
 585          */
 586         if (local->hw.wiphy->max_scan_ie_len)
 587                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 588
 589         local->hw.wiphy->cipher_suites = cipher_suites;
 590         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 591         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 592                 local->hw.wiphy->n_cipher_suites--;
 593
 594         result = wiphy_register(local->hw.wiphy);
 595         if (result < 0)
 596                 goto fail_wiphy_register;
 597
 598         /*
 599          * We use the number of queues for feature tests (QoS, HT) internally
 600          * so restrict them appropriately.
 601          */
 602         if (hw->queues > IEEE80211_MAX_QUEUES)
 603                 hw->queues = IEEE80211_MAX_QUEUES;
 604
 605         local->workqueue =
 606                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
 607         if (!local->workqueue) {
 608                 result = -ENOMEM;
 609                 goto fail_workqueue;
 610         }
 611
 612         /*
 613          * The hardware needs headroom for sending the frame,
 614          * and we need some headroom for passing the frame to monitor
 615          * interfaces, but never both at the same time.
 616          */
 617         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
 618                         sizeof(struct ieee80211_tx_status_rtap_hdr));
 619         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 620                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 621
 622         debugfs_hw_add(local);
 623
 624         /*
 625          * if the driver doesn't specify a max listen interval we
 626          * use 5 which should be a safe default
 627          */
 628         if (local->hw.max_listen_interval == 0)
 629                 local->hw.max_listen_interval = 5;
 630
 631         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 632
 633         local->dynamic_ps_forced_timeout = -1;
 634
 635         result = sta_info_start(local);
 636         if (result < 0)
 637                 goto fail_sta_info;
 638
 639         result = ieee80211_wep_init(local);
 640         if (result < 0) {
 641                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 642                        wiphy_name(local->hw.wiphy), result);
 643                 goto fail_wep;
 644         }
 645
 646         rtnl_lock();
 647
 648         result = ieee80211_init_rate_ctrl_alg(local,
 649                                               hw->rate_control_algorithm);
 650         if (result < 0) {
 651                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 652                        "algorithm\n", wiphy_name(local->hw.wiphy));
 653                 goto fail_rate;
 654         }
 655
 656         /* add one default STA interface if supported */
 657         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 658                 result = ieee80211_if_add(local, "wlan%d", NULL,
 659                                           NL80211_IFTYPE_STATION, NULL);
 660                 if (result)
 661                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 662                                wiphy_name(local->hw.wiphy));
 663         }
 664
 665         rtnl_unlock();
 666
 667         ieee80211_led_init(local);
 668
 669         local->network_latency_notifier.notifier_call =
 670                 ieee80211_max_network_latency;
 671         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 672                                      &local->network_latency_notifier);
 673         if (result) {
 674                 rtnl_lock();
 675                 goto fail_pm_qos;
 676         }
 677
 678 #ifdef CONFIG_INET
 679         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 680         result = register_inetaddr_notifier(&local->ifa_notifier);
 681         if (result)
 682                 goto fail_ifa;
 683 #endif
 684
 685         return 0;
 686
 687  fail_ifa:
 688         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 689                                &local->network_latency_notifier);
 690         rtnl_lock();
 691  fail_pm_qos:
 692         ieee80211_led_exit(local);
 693         ieee80211_remove_interfaces(local);
 694  fail_rate:
 695         rtnl_unlock();
 696         ieee80211_wep_free(local);
 697  fail_wep:
 698         sta_info_stop(local);
 699  fail_sta_info:
 700         destroy_workqueue(local->workqueue);
 701  fail_workqueue:
 702         wiphy_unregister(local->hw.wiphy);
 703  fail_wiphy_register:
 704         kfree(local->int_scan_req);
 705         return result;
 706 }
 707 EXPORT_SYMBOL(ieee80211_register_hw);
 708
 709 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 710 {
 711         struct ieee80211_local *local = hw_to_local(hw);
 712
 713         tasklet_kill(&local->tx_pending_tasklet);
 714         tasklet_kill(&local->tasklet);
 715
 716         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 717                                &local->network_latency_notifier);
 718 #ifdef CONFIG_INET
 719         unregister_inetaddr_notifier(&local->ifa_notifier);
 720 #endif
 721
 722         rtnl_lock();
 723
 724         /*
 725          * At this point, interface list manipulations are fine
 726          * because the driver cannot be handing us frames any
 727          * more and the tasklet is killed.
 728          */
 729         ieee80211_remove_interfaces(local);
 730
 731         rtnl_unlock();
 732
 733         cancel_work_sync(&local->reconfig_filter);
 734
 735         ieee80211_clear_tx_pending(local);
 736         sta_info_stop(local);
 737         rate_control_deinitialize(local);
 738
 739         if (skb_queue_len(&local->skb_queue) ||
 740             skb_queue_len(&local->skb_queue_unreliable))
 741                 printk(KERN_WARNING "%s: skb_queue not empty\n",
 742                        wiphy_name(local->hw.wiphy));
 743         skb_queue_purge(&local->skb_queue);
 744         skb_queue_purge(&local->skb_queue_unreliable);
 745
 746         destroy_workqueue(local->workqueue);
 747         wiphy_unregister(local->hw.wiphy);
 748         ieee80211_wep_free(local);
 749         ieee80211_led_exit(local);
 750         kfree(local->int_scan_req);
 751 }
 752 EXPORT_SYMBOL(ieee80211_unregister_hw);
 753
 754 void ieee80211_free_hw(struct ieee80211_hw *hw)
 755 {
 756         struct ieee80211_local *local = hw_to_local(hw);
 757
 758         mutex_destroy(&local->iflist_mtx);
 759         mutex_destroy(&local->scan_mtx);
 760
 761         wiphy_free(local->hw.wiphy);
 762 }
 763 EXPORT_SYMBOL(ieee80211_free_hw);
 764
 765 static int __init ieee80211_init(void)
 766 {
 767         struct sk_buff *skb;
 768         int ret;
 769
 770         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
 771         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
 772                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
 773
 774         ret = rc80211_minstrel_init();
 775         if (ret)
 776                 return ret;
 777
 778         ret = rc80211_minstrel_ht_init();
 779         if (ret)
 780                 goto err_minstrel;
 781
 782         ret = rc80211_pid_init();
 783         if (ret)
 784                 goto err_pid;
 785
 786         ret = ieee80211_iface_init();
 787         if (ret)
 788                 goto err_netdev;
 789
 790         return 0;
 791  err_netdev:
 792         rc80211_pid_exit();
 793  err_pid:
 794         rc80211_minstrel_ht_exit();
 795  err_minstrel:
 796         rc80211_minstrel_exit();
 797
 798         return ret;
 799 }
 800
 801 static void __exit ieee80211_exit(void)
 802 {
 803         rc80211_pid_exit();
 804         rc80211_minstrel_ht_exit();
 805         rc80211_minstrel_exit();
 806
 807         /*
 808          * For key todo, it'll be empty by now but the work
 809          * might still be scheduled.
 810          */
 811         flush_scheduled_work();
 812
 813         if (mesh_allocated)
 814                 ieee80211s_stop();
 815
 816         ieee80211_iface_exit();
 817 }
 818
 819
 820 subsys_initcall(ieee80211_init);
 821 module_exit(ieee80211_exit);
 822
 823 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
 824 MODULE_LICENSE("GPL");