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                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 111         } else if (local->tmp_channel &&
 112                    local->oper_channel != local->tmp_channel) {
 113                 chan = scan_chan = local->tmp_channel;
 114                 channel_type = local->tmp_channel_type;
 115                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 116         } else {
 117                 chan = local->oper_channel;
 118                 channel_type = local->_oper_channel_type;
 119                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 120         }
 121
 122         if (chan != local->hw.conf.channel ||
 123             channel_type != local->hw.conf.channel_type) {
 124                 local->hw.conf.channel = chan;
 125                 local->hw.conf.channel_type = channel_type;
 126                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 127         }
 128
 129         if (!conf_is_ht(&local->hw.conf)) {
 130                 /*
 131                  * mac80211.h documents that this is only valid
 132                  * when the channel is set to an HT type, and
 133                  * that otherwise STATIC is used.
 134                  */
 135                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 136         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 137                 local->hw.conf.smps_mode = local->smps_mode;
 138                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 139         }
 140
 141         if (scan_chan)
 142                 power = chan->max_power;
 143         else
 144                 power = local->power_constr_level ?
 145                         (chan->max_power - local->power_constr_level) :
 146                         chan->max_power;
 147
 148         if (local->user_power_level >= 0)
 149                 power = min(power, local->user_power_level);
 150
 151         if (local->hw.conf.power_level != power) {
 152                 changed |= IEEE80211_CONF_CHANGE_POWER;
 153                 local->hw.conf.power_level = power;
 154         }
 155
 156         if (changed && local->open_count) {
 157                 ret = drv_config(local, changed);
 158                 /*
 159                  * Goal:
 160                  * HW reconfiguration should never fail, the driver has told
 161                  * us what it can support so it should live up to that promise.
 162                  *
 163                  * Current status:
 164                  * rfkill is not integrated with mac80211 and a
 165                  * configuration command can thus fail if hardware rfkill
 166                  * is enabled
 167                  *
 168                  * FIXME: integrate rfkill with mac80211 and then add this
 169                  * WARN_ON() back
 170                  *
 171                  */
 172                 /* WARN_ON(ret); */
 173         }
 174
 175         return ret;
 176 }
 177
 178 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 179                                       u32 changed)
 180 {
 181         struct ieee80211_local *local = sdata->local;
 182         static const u8 zero[ETH_ALEN] = { 0 };
 183
 184         if (!changed)
 185                 return;
 186
 187         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 188                 /*
 189                  * While not associated, claim a BSSID of all-zeroes
 190                  * so that drivers don't do any weird things with the
 191                  * BSSID at that time.
 192                  */
 193                 if (sdata->vif.bss_conf.assoc)
 194                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 195                 else
 196                         sdata->vif.bss_conf.bssid = zero;
 197         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 198                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 199         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 200                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 201         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 202                 sdata->vif.bss_conf.bssid = zero;
 203         } else {
 204                 WARN_ON(1);
 205                 return;
 206         }
 207
 208         switch (sdata->vif.type) {
 209         case NL80211_IFTYPE_AP:
 210         case NL80211_IFTYPE_ADHOC:
 211         case NL80211_IFTYPE_MESH_POINT:
 212                 break;
 213         default:
 214                 /* do not warn to simplify caller in scan.c */
 215                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 216                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 217                         return;
 218                 break;
 219         }
 220
 221         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 222                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
 223                     test_bit(SCAN_SW_SCANNING, &local->scanning)) {
 224                         sdata->vif.bss_conf.enable_beacon = false;
 225                 } else {
 226                         /*
 227                          * Beacon should be enabled, but AP mode must
 228                          * check whether there is a beacon configured.
 229                          */
 230                         switch (sdata->vif.type) {
 231                         case NL80211_IFTYPE_AP:
 232                                 sdata->vif.bss_conf.enable_beacon =
 233                                         !!sdata->u.ap.beacon;
 234                                 break;
 235                         case NL80211_IFTYPE_ADHOC:
 236                                 sdata->vif.bss_conf.enable_beacon =
 237                                         !!sdata->u.ibss.presp;
 238                                 break;
 239                         case NL80211_IFTYPE_MESH_POINT:
 240                                 sdata->vif.bss_conf.enable_beacon = true;
 241                                 break;
 242                         default:
 243                                 /* not reached */
 244                                 WARN_ON(1);
 245                                 break;
 246                         }
 247                 }
 248         }
 249
 250         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 251 }
 252
 253 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 254 {
 255         sdata->vif.bss_conf.use_cts_prot = false;
 256         sdata->vif.bss_conf.use_short_preamble = false;
 257         sdata->vif.bss_conf.use_short_slot = false;
 258         return BSS_CHANGED_ERP_CTS_PROT |
 259                BSS_CHANGED_ERP_PREAMBLE |
 260                BSS_CHANGED_ERP_SLOT;
 261 }
 262
 263 static void ieee80211_tasklet_handler(unsigned long data)
 264 {
 265         struct ieee80211_local *local = (struct ieee80211_local *) data;
 266         struct sk_buff *skb;
 267
 268         while ((skb = skb_dequeue(&local->skb_queue)) ||
 269                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 270                 switch (skb->pkt_type) {
 271                 case IEEE80211_RX_MSG:
 272                         /* Clear skb->pkt_type in order to not confuse kernel
 273                          * netstack. */
 274                         skb->pkt_type = 0;
 275                         ieee80211_rx(local_to_hw(local), skb);
 276                         break;
 277                 case IEEE80211_TX_STATUS_MSG:
 278                         skb->pkt_type = 0;
 279                         ieee80211_tx_status(local_to_hw(local), skb);
 280                         break;
 281                 default:
 282                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 283                              skb->pkt_type);
 284                         dev_kfree_skb(skb);
 285                         break;
 286                 }
 287         }
 288 }
 289
 290 static void ieee80211_restart_work(struct work_struct *work)
 291 {
 292         struct ieee80211_local *local =
 293                 container_of(work, struct ieee80211_local, restart_work);
 294
 295         rtnl_lock();
 296         ieee80211_reconfig(local);
 297         rtnl_unlock();
 298 }
 299
 300 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 301 {
 302         struct ieee80211_local *local = hw_to_local(hw);
 303
 304         trace_api_restart_hw(local);
 305
 306         /* use this reason, __ieee80211_resume will unblock it */
 307         ieee80211_stop_queues_by_reason(hw,
 308                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 309
 310         schedule_work(&local->restart_work);
 311 }
 312 EXPORT_SYMBOL(ieee80211_restart_hw);
 313
 314 static void ieee80211_recalc_smps_work(struct work_struct *work)
 315 {
 316         struct ieee80211_local *local =
 317                 container_of(work, struct ieee80211_local, recalc_smps);
 318
 319         mutex_lock(&local->iflist_mtx);
 320         ieee80211_recalc_smps(local, NULL);
 321         mutex_unlock(&local->iflist_mtx);
 322 }
 323
 324 #ifdef CONFIG_INET
 325 static int ieee80211_ifa_changed(struct notifier_block *nb,
 326                                  unsigned long data, void *arg)
 327 {
 328         struct in_ifaddr *ifa = arg;
 329         struct ieee80211_local *local =
 330                 container_of(nb, struct ieee80211_local,
 331                              ifa_notifier);
 332         struct net_device *ndev = ifa->ifa_dev->dev;
 333         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 334         struct in_device *idev;
 335         struct ieee80211_sub_if_data *sdata;
 336         struct ieee80211_bss_conf *bss_conf;
 337         struct ieee80211_if_managed *ifmgd;
 338         int c = 0;
 339
 340         if (!netif_running(ndev))
 341                 return NOTIFY_DONE;
 342
 343         /* Make sure it's our interface that got changed */
 344         if (!wdev)
 345                 return NOTIFY_DONE;
 346
 347         if (wdev->wiphy != local->hw.wiphy)
 348                 return NOTIFY_DONE;
 349
 350         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 351         bss_conf = &sdata->vif.bss_conf;
 352
 353         /* ARP filtering is only supported in managed mode */
 354         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 355                 return NOTIFY_DONE;
 356
 357         idev = sdata->dev->ip_ptr;
 358         if (!idev)
 359                 return NOTIFY_DONE;
 360
 361         ifmgd = &sdata->u.mgd;
 362         mutex_lock(&ifmgd->mtx);
 363
 364         /* Copy the addresses to the bss_conf list */
 365         ifa = idev->ifa_list;
 366         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
 367                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
 368                 ifa = ifa->ifa_next;
 369                 c++;
 370         }
 371
 372         /* If not all addresses fit the list, disable filtering */
 373         if (ifa) {
 374                 sdata->arp_filter_state = false;
 375                 c = 0;
 376         } else {
 377                 sdata->arp_filter_state = true;
 378         }
 379         bss_conf->arp_addr_cnt = c;
 380
 381         /* Configure driver only if associated */
 382         if (ifmgd->associated) {
 383                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 384                 ieee80211_bss_info_change_notify(sdata,
 385                                                  BSS_CHANGED_ARP_FILTER);
 386         }
 387
 388         mutex_unlock(&ifmgd->mtx);
 389
 390         return NOTIFY_DONE;
 391 }
 392 #endif
 393
 394 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 395                                         const struct ieee80211_ops *ops)
 396 {
 397         struct ieee80211_local *local;
 398         int priv_size, i;
 399         struct wiphy *wiphy;
 400
 401         /* Ensure 32-byte alignment of our private data and hw private data.
 402          * We use the wiphy priv data for both our ieee80211_local and for
 403          * the driver's private data
 404          *
 405          * In memory it'll be like this:
 406          *
 407          * +-------------------------+
 408          * | struct wiphy           |
 409          * +-------------------------+
 410          * | struct ieee80211_local  |
 411          * +-------------------------+
 412          * | driver's private data   |
 413          * +-------------------------+
 414          *
 415          */
 416         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 417
 418         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 419
 420         if (!wiphy)
 421                 return NULL;
 422
 423         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 424                         WIPHY_FLAG_4ADDR_AP |
 425                         WIPHY_FLAG_4ADDR_STATION;
 426         wiphy->privid = mac80211_wiphy_privid;
 427
 428         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 429
 430         local = wiphy_priv(wiphy);
 431
 432         local->hw.wiphy = wiphy;
 433
 434         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 435
 436         BUG_ON(!ops->tx);
 437         BUG_ON(!ops->start);
 438         BUG_ON(!ops->stop);
 439         BUG_ON(!ops->config);
 440         BUG_ON(!ops->add_interface);
 441         BUG_ON(!ops->remove_interface);
 442         BUG_ON(!ops->configure_filter);
 443         local->ops = ops;
 444
 445         /* set up some defaults */
 446         local->hw.queues = 1;
 447         local->hw.max_rates = 1;
 448         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 449         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 450         local->user_power_level = -1;
 451         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 452         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 453
 454         INIT_LIST_HEAD(&local->interfaces);
 455
 456         __hw_addr_init(&local->mc_list);
 457
 458         mutex_init(&local->iflist_mtx);
 459         mutex_init(&local->scan_mtx);
 460
 461         mutex_init(&local->key_mtx);
 462         spin_lock_init(&local->filter_lock);
 463         spin_lock_init(&local->queue_stop_reason_lock);
 464
 465         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 466
 467         ieee80211_work_init(local);
 468
 469         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 470
 471         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 472         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
 473         local->smps_mode = IEEE80211_SMPS_OFF;
 474
 475         INIT_WORK(&local->dynamic_ps_enable_work,
 476                   ieee80211_dynamic_ps_enable_work);
 477         INIT_WORK(&local->dynamic_ps_disable_work,
 478                   ieee80211_dynamic_ps_disable_work);
 479         setup_timer(&local->dynamic_ps_timer,
 480                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 481
 482         sta_info_init(local);
 483
 484         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 485                 skb_queue_head_init(&local->pending[i]);
 486                 atomic_set(&local->agg_queue_stop[i], 0);
 487         }
 488         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 489                      (unsigned long)local);
 490
 491         tasklet_init(&local->tasklet,
 492                      ieee80211_tasklet_handler,
 493                      (unsigned long) local);
 494
 495         skb_queue_head_init(&local->skb_queue);
 496         skb_queue_head_init(&local->skb_queue_unreliable);
 497
 498         return local_to_hw(local);
 499 }
 500 EXPORT_SYMBOL(ieee80211_alloc_hw);
 501
 502 int ieee80211_register_hw(struct ieee80211_hw *hw)
 503 {
 504         struct ieee80211_local *local = hw_to_local(hw);
 505         int result;
 506         enum ieee80211_band band;
 507         int channels, max_bitrates;
 508         bool supp_ht;
 509         static const u32 cipher_suites[] = {
 510                 WLAN_CIPHER_SUITE_WEP40,
 511                 WLAN_CIPHER_SUITE_WEP104,
 512                 WLAN_CIPHER_SUITE_TKIP,
 513                 WLAN_CIPHER_SUITE_CCMP,
 514
 515                 /* keep last -- depends on hw flags! */
 516                 WLAN_CIPHER_SUITE_AES_CMAC
 517         };
 518
 519         /*
 520          * generic code guarantees at least one band,
 521          * set this very early because much code assumes
 522          * that hw.conf.channel is assigned
 523          */
 524         channels = 0;
 525         max_bitrates = 0;
 526         supp_ht = false;
 527         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 528                 struct ieee80211_supported_band *sband;
 529
 530                 sband = local->hw.wiphy->bands[band];
 531                 if (!sband)
 532                         continue;
 533                 if (!local->oper_channel) {
 534                         /* init channel we're on */
 535                         local->hw.conf.channel =
 536                         local->oper_channel = &sband->channels[0];
 537                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 538                 }
 539                 channels += sband->n_channels;
 540
 541                 if (max_bitrates < sband->n_bitrates)
 542                         max_bitrates = sband->n_bitrates;
 543                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 544         }
 545
 546         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 547                                       sizeof(void *) * channels, GFP_KERNEL);
 548         if (!local->int_scan_req)
 549                 return -ENOMEM;
 550
 551         /* if low-level driver supports AP, we also support VLAN */
 552         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 553                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 554
 555         /* mac80211 always supports monitor */
 556         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 557
 558         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 559                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 560         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 561                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 562
 563         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 564              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 565              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 566
 567         /*
 568          * Calculate scan IE length -- we need this to alloc
 569          * memory and to subtract from the driver limit. It
 570          * includes the (extended) supported rates and HT
 571          * information -- SSID is the driver's responsibility.
 572          */
 573         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
 574         if (supp_ht)
 575                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 576
 577         if (!local->ops->hw_scan) {
 578                 /* For hw_scan, driver needs to set these up. */
 579                 local->hw.wiphy->max_scan_ssids = 4;
 580                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 581         }
 582
 583         /*
 584          * If the driver supports any scan IEs, then assume the
 585          * limit includes the IEs mac80211 will add, otherwise
 586          * leave it at zero and let the driver sort it out; we
 587          * still pass our IEs to the driver but userspace will
 588          * not be allowed to in that case.
 589          */
 590         if (local->hw.wiphy->max_scan_ie_len)
 591                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 592
 593         local->hw.wiphy->cipher_suites = cipher_suites;
 594         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 595         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 596                 local->hw.wiphy->n_cipher_suites--;
 597
 598         result = wiphy_register(local->hw.wiphy);
 599         if (result < 0)
 600                 goto fail_wiphy_register;
 601
 602         /*
 603          * We use the number of queues for feature tests (QoS, HT) internally
 604          * so restrict them appropriately.
 605          */
 606         if (hw->queues > IEEE80211_MAX_QUEUES)
 607                 hw->queues = IEEE80211_MAX_QUEUES;
 608
 609         local->workqueue =
 610                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
 611         if (!local->workqueue) {
 612                 result = -ENOMEM;
 613                 goto fail_workqueue;
 614         }
 615
 616         /*
 617          * The hardware needs headroom for sending the frame,
 618          * and we need some headroom for passing the frame to monitor
 619          * interfaces, but never both at the same time.
 620          */
 621         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
 622                         sizeof(struct ieee80211_tx_status_rtap_hdr));
 623         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 624                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 625
 626         debugfs_hw_add(local);
 627
 628         /*
 629          * if the driver doesn't specify a max listen interval we
 630          * use 5 which should be a safe default
 631          */
 632         if (local->hw.max_listen_interval == 0)
 633                 local->hw.max_listen_interval = 5;
 634
 635         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 636
 637         local->dynamic_ps_forced_timeout = -1;
 638
 639         result = sta_info_start(local);
 640         if (result < 0)
 641                 goto fail_sta_info;
 642
 643         result = ieee80211_wep_init(local);
 644         if (result < 0)
 645                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 646                        wiphy_name(local->hw.wiphy), result);
 647
 648         rtnl_lock();
 649
 650         result = ieee80211_init_rate_ctrl_alg(local,
 651                                               hw->rate_control_algorithm);
 652         if (result < 0) {
 653                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 654                        "algorithm\n", wiphy_name(local->hw.wiphy));
 655                 goto fail_rate;
 656         }
 657
 658         /* add one default STA interface if supported */
 659         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 660                 result = ieee80211_if_add(local, "wlan%d", NULL,
 661                                           NL80211_IFTYPE_STATION, NULL);
 662                 if (result)
 663                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 664                                wiphy_name(local->hw.wiphy));
 665         }
 666
 667         rtnl_unlock();
 668
 669         ieee80211_led_init(local);
 670
 671         local->network_latency_notifier.notifier_call =
 672                 ieee80211_max_network_latency;
 673         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 674                                      &local->network_latency_notifier);
 675         if (result) {
 676                 rtnl_lock();
 677                 goto fail_pm_qos;
 678         }
 679
 680 #ifdef CONFIG_INET
 681         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 682         result = register_inetaddr_notifier(&local->ifa_notifier);
 683         if (result)
 684                 goto fail_ifa;
 685 #endif
 686
 687         return 0;
 688
 689 #ifdef CONFIG_INET
 690  fail_ifa:
 691         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 692                                &local->network_latency_notifier);
 693         rtnl_lock();
 694 #endif
 695  fail_pm_qos:
 696         ieee80211_led_exit(local);
 697         ieee80211_remove_interfaces(local);
 698  fail_rate:
 699         rtnl_unlock();
 700         ieee80211_wep_free(local);
 701         sta_info_stop(local);
 702  fail_sta_info:
 703         destroy_workqueue(local->workqueue);
 704  fail_workqueue:
 705         wiphy_unregister(local->hw.wiphy);
 706  fail_wiphy_register:
 707         kfree(local->int_scan_req);
 708         return result;
 709 }
 710 EXPORT_SYMBOL(ieee80211_register_hw);
 711
 712 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 713 {
 714         struct ieee80211_local *local = hw_to_local(hw);
 715
 716         tasklet_kill(&local->tx_pending_tasklet);
 717         tasklet_kill(&local->tasklet);
 718
 719         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 720                                &local->network_latency_notifier);
 721 #ifdef CONFIG_INET
 722         unregister_inetaddr_notifier(&local->ifa_notifier);
 723 #endif
 724
 725         rtnl_lock();
 726
 727         /*
 728          * At this point, interface list manipulations are fine
 729          * because the driver cannot be handing us frames any
 730          * more and the tasklet is killed.
 731          */
 732         ieee80211_remove_interfaces(local);
 733
 734         rtnl_unlock();
 735
 736         /*
 737          * Now all work items will be gone, but the
 738          * timer might still be armed, so delete it
 739          */
 740         del_timer_sync(&local->work_timer);
 741
 742         cancel_work_sync(&local->reconfig_filter);
 743
 744         ieee80211_clear_tx_pending(local);
 745         sta_info_stop(local);
 746         rate_control_deinitialize(local);
 747
 748         if (skb_queue_len(&local->skb_queue) ||
 749             skb_queue_len(&local->skb_queue_unreliable))
 750                 printk(KERN_WARNING "%s: skb_queue not empty\n",
 751                        wiphy_name(local->hw.wiphy));
 752         skb_queue_purge(&local->skb_queue);
 753         skb_queue_purge(&local->skb_queue_unreliable);
 754
 755         destroy_workqueue(local->workqueue);
 756         wiphy_unregister(local->hw.wiphy);
 757         ieee80211_wep_free(local);
 758         ieee80211_led_exit(local);
 759         kfree(local->int_scan_req);
 760 }
 761 EXPORT_SYMBOL(ieee80211_unregister_hw);
 762
 763 void ieee80211_free_hw(struct ieee80211_hw *hw)
 764 {
 765         struct ieee80211_local *local = hw_to_local(hw);
 766
 767         mutex_destroy(&local->iflist_mtx);
 768         mutex_destroy(&local->scan_mtx);
 769
 770         wiphy_free(local->hw.wiphy);
 771 }
 772 EXPORT_SYMBOL(ieee80211_free_hw);
 773
 774 static int __init ieee80211_init(void)
 775 {
 776         struct sk_buff *skb;
 777         int ret;
 778
 779         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
 780         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
 781                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
 782
 783         ret = rc80211_minstrel_init();
 784         if (ret)
 785                 return ret;
 786
 787         ret = rc80211_minstrel_ht_init();
 788         if (ret)
 789                 goto err_minstrel;
 790
 791         ret = rc80211_pid_init();
 792         if (ret)
 793                 goto err_pid;
 794
 795         ret = ieee80211_iface_init();
 796         if (ret)
 797                 goto err_netdev;
 798
 799         return 0;
 800  err_netdev:
 801         rc80211_pid_exit();
 802  err_pid:
 803         rc80211_minstrel_ht_exit();
 804  err_minstrel:
 805         rc80211_minstrel_exit();
 806
 807         return ret;
 808 }
 809
 810 static void __exit ieee80211_exit(void)
 811 {
 812         rc80211_pid_exit();
 813         rc80211_minstrel_ht_exit();
 814         rc80211_minstrel_exit();
 815
 816         /*
 817          * For key todo, it'll be empty by now but the work
 818          * might still be scheduled.
 819          */
 820         flush_scheduled_work();
 821
 822         if (mesh_allocated)
 823                 ieee80211s_stop();
 824
 825         ieee80211_iface_exit();
 826 }
 827
 828
 829 subsys_initcall(ieee80211_init);
 830 module_exit(ieee80211_exit);
 831
 832 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
 833 MODULE_LICENSE("GPL");