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