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         u32 offchannel_flag;
 103
 104         might_sleep();
 105
 106         scan_chan = local->scan_channel;
 107
 108         offchannel_flag = local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 109         if (scan_chan) {
 110                 chan = scan_chan;
 111                 channel_type = NL80211_CHAN_NO_HT;
 112                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 113         } else if (local->tmp_channel) {
 114                 chan = scan_chan = local->tmp_channel;
 115                 channel_type = local->tmp_channel_type;
 116                 local->hw.conf.flags |= IEEE80211_CONF_OFFCHANNEL;
 117         } else {
 118                 chan = local->oper_channel;
 119                 channel_type = local->_oper_channel_type;
 120                 local->hw.conf.flags &= ~IEEE80211_CONF_OFFCHANNEL;
 121         }
 122         offchannel_flag ^= local->hw.conf.flags & IEEE80211_CONF_OFFCHANNEL;
 123
 124         if (offchannel_flag || chan != local->hw.conf.channel ||
 125             channel_type != local->hw.conf.channel_type) {
 126                 local->hw.conf.channel = chan;
 127                 local->hw.conf.channel_type = channel_type;
 128                 changed |= IEEE80211_CONF_CHANGE_CHANNEL;
 129         }
 130
 131         if (!conf_is_ht(&local->hw.conf)) {
 132                 /*
 133                  * mac80211.h documents that this is only valid
 134                  * when the channel is set to an HT type, and
 135                  * that otherwise STATIC is used.
 136                  */
 137                 local->hw.conf.smps_mode = IEEE80211_SMPS_STATIC;
 138         } else if (local->hw.conf.smps_mode != local->smps_mode) {
 139                 local->hw.conf.smps_mode = local->smps_mode;
 140                 changed |= IEEE80211_CONF_CHANGE_SMPS;
 141         }
 142
 143         if (scan_chan)
 144                 power = chan->max_power;
 145         else
 146                 power = local->power_constr_level ?
 147                         (chan->max_power - local->power_constr_level) :
 148                         chan->max_power;
 149
 150         if (local->user_power_level >= 0)
 151                 power = min(power, local->user_power_level);
 152
 153         if (local->hw.conf.power_level != power) {
 154                 changed |= IEEE80211_CONF_CHANGE_POWER;
 155                 local->hw.conf.power_level = power;
 156         }
 157
 158         if (changed && local->open_count) {
 159                 ret = drv_config(local, changed);
 160                 /*
 161                  * Goal:
 162                  * HW reconfiguration should never fail, the driver has told
 163                  * us what it can support so it should live up to that promise.
 164                  *
 165                  * Current status:
 166                  * rfkill is not integrated with mac80211 and a
 167                  * configuration command can thus fail if hardware rfkill
 168                  * is enabled
 169                  *
 170                  * FIXME: integrate rfkill with mac80211 and then add this
 171                  * WARN_ON() back
 172                  *
 173                  */
 174                 /* WARN_ON(ret); */
 175         }
 176
 177         return ret;
 178 }
 179
 180 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 181                                       u32 changed)
 182 {
 183         struct ieee80211_local *local = sdata->local;
 184         static const u8 zero[ETH_ALEN] = { 0 };
 185
 186         if (!changed)
 187                 return;
 188
 189         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 190                 /*
 191                  * While not associated, claim a BSSID of all-zeroes
 192                  * so that drivers don't do any weird things with the
 193                  * BSSID at that time.
 194                  */
 195                 if (sdata->vif.bss_conf.assoc)
 196                         sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
 197                 else
 198                         sdata->vif.bss_conf.bssid = zero;
 199         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 200                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
 201         else if (sdata->vif.type == NL80211_IFTYPE_AP)
 202                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
 203         else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 204                 sdata->vif.bss_conf.bssid = zero;
 205         } else {
 206                 WARN_ON(1);
 207                 return;
 208         }
 209
 210         switch (sdata->vif.type) {
 211         case NL80211_IFTYPE_AP:
 212         case NL80211_IFTYPE_ADHOC:
 213         case NL80211_IFTYPE_MESH_POINT:
 214                 break;
 215         default:
 216                 /* do not warn to simplify caller in scan.c */
 217                 changed &= ~BSS_CHANGED_BEACON_ENABLED;
 218                 if (WARN_ON(changed & BSS_CHANGED_BEACON))
 219                         return;
 220                 break;
 221         }
 222
 223         if (changed & BSS_CHANGED_BEACON_ENABLED) {
 224                 if (local->quiescing || !ieee80211_sdata_running(sdata) ||
 225                     test_bit(SCAN_SW_SCANNING, &local->scanning)) {
 226                         sdata->vif.bss_conf.enable_beacon = false;
 227                 } else {
 228                         /*
 229                          * Beacon should be enabled, but AP mode must
 230                          * check whether there is a beacon configured.
 231                          */
 232                         switch (sdata->vif.type) {
 233                         case NL80211_IFTYPE_AP:
 234                                 sdata->vif.bss_conf.enable_beacon =
 235                                         !!sdata->u.ap.beacon;
 236                                 break;
 237                         case NL80211_IFTYPE_ADHOC:
 238                                 sdata->vif.bss_conf.enable_beacon =
 239                                         !!sdata->u.ibss.presp;
 240                                 break;
 241                         case NL80211_IFTYPE_MESH_POINT:
 242                                 sdata->vif.bss_conf.enable_beacon = true;
 243                                 break;
 244                         default:
 245                                 /* not reached */
 246                                 WARN_ON(1);
 247                                 break;
 248                         }
 249                 }
 250         }
 251
 252         drv_bss_info_changed(local, sdata, &sdata->vif.bss_conf, changed);
 253 }
 254
 255 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 256 {
 257         sdata->vif.bss_conf.use_cts_prot = false;
 258         sdata->vif.bss_conf.use_short_preamble = false;
 259         sdata->vif.bss_conf.use_short_slot = false;
 260         return BSS_CHANGED_ERP_CTS_PROT |
 261                BSS_CHANGED_ERP_PREAMBLE |
 262                BSS_CHANGED_ERP_SLOT;
 263 }
 264
 265 static void ieee80211_tasklet_handler(unsigned long data)
 266 {
 267         struct ieee80211_local *local = (struct ieee80211_local *) data;
 268         struct sk_buff *skb;
 269
 270         while ((skb = skb_dequeue(&local->skb_queue)) ||
 271                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 272                 switch (skb->pkt_type) {
 273                 case IEEE80211_RX_MSG:
 274                         /* Clear skb->pkt_type in order to not confuse kernel
 275                          * netstack. */
 276                         skb->pkt_type = 0;
 277                         ieee80211_rx(local_to_hw(local), skb);
 278                         break;
 279                 case IEEE80211_TX_STATUS_MSG:
 280                         skb->pkt_type = 0;
 281                         ieee80211_tx_status(local_to_hw(local), skb);
 282                         break;
 283                 default:
 284                         WARN(1, "mac80211: Packet is of unknown type %d\n",
 285                              skb->pkt_type);
 286                         dev_kfree_skb(skb);
 287                         break;
 288                 }
 289         }
 290 }
 291
 292 static void ieee80211_restart_work(struct work_struct *work)
 293 {
 294         struct ieee80211_local *local =
 295                 container_of(work, struct ieee80211_local, restart_work);
 296
 297         rtnl_lock();
 298         ieee80211_reconfig(local);
 299         rtnl_unlock();
 300 }
 301
 302 void ieee80211_restart_hw(struct ieee80211_hw *hw)
 303 {
 304         struct ieee80211_local *local = hw_to_local(hw);
 305
 306         trace_api_restart_hw(local);
 307
 308         /* use this reason, __ieee80211_resume will unblock it */
 309         ieee80211_stop_queues_by_reason(hw,
 310                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 311
 312         schedule_work(&local->restart_work);
 313 }
 314 EXPORT_SYMBOL(ieee80211_restart_hw);
 315
 316 static void ieee80211_recalc_smps_work(struct work_struct *work)
 317 {
 318         struct ieee80211_local *local =
 319                 container_of(work, struct ieee80211_local, recalc_smps);
 320
 321         mutex_lock(&local->iflist_mtx);
 322         ieee80211_recalc_smps(local, NULL);
 323         mutex_unlock(&local->iflist_mtx);
 324 }
 325
 326 #ifdef CONFIG_INET
 327 static int ieee80211_ifa_changed(struct notifier_block *nb,
 328                                  unsigned long data, void *arg)
 329 {
 330         struct in_ifaddr *ifa = arg;
 331         struct ieee80211_local *local =
 332                 container_of(nb, struct ieee80211_local,
 333                              ifa_notifier);
 334         struct net_device *ndev = ifa->ifa_dev->dev;
 335         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 336         struct in_device *idev;
 337         struct ieee80211_sub_if_data *sdata;
 338         struct ieee80211_bss_conf *bss_conf;
 339         struct ieee80211_if_managed *ifmgd;
 340         int c = 0;
 341
 342         if (!netif_running(ndev))
 343                 return NOTIFY_DONE;
 344
 345         /* Make sure it's our interface that got changed */
 346         if (!wdev)
 347                 return NOTIFY_DONE;
 348
 349         if (wdev->wiphy != local->hw.wiphy)
 350                 return NOTIFY_DONE;
 351
 352         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 353         bss_conf = &sdata->vif.bss_conf;
 354
 355         /* ARP filtering is only supported in managed mode */
 356         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 357                 return NOTIFY_DONE;
 358
 359         idev = sdata->dev->ip_ptr;
 360         if (!idev)
 361                 return NOTIFY_DONE;
 362
 363         ifmgd = &sdata->u.mgd;
 364         mutex_lock(&ifmgd->mtx);
 365
 366         /* Copy the addresses to the bss_conf list */
 367         ifa = idev->ifa_list;
 368         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
 369                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
 370                 ifa = ifa->ifa_next;
 371                 c++;
 372         }
 373
 374         /* If not all addresses fit the list, disable filtering */
 375         if (ifa) {
 376                 sdata->arp_filter_state = false;
 377                 c = 0;
 378         } else {
 379                 sdata->arp_filter_state = true;
 380         }
 381         bss_conf->arp_addr_cnt = c;
 382
 383         /* Configure driver only if associated */
 384         if (ifmgd->associated) {
 385                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 386                 ieee80211_bss_info_change_notify(sdata,
 387                                                  BSS_CHANGED_ARP_FILTER);
 388         }
 389
 390         mutex_unlock(&ifmgd->mtx);
 391
 392         return NOTIFY_DONE;
 393 }
 394 #endif
 395
 396 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
 397 {
 398         struct ieee80211_local *local =
 399                 container_of(napi, struct ieee80211_local, napi);
 400
 401         return local->ops->napi_poll(&local->hw, budget);
 402 }
 403
 404 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
 405 {
 406         struct ieee80211_local *local = hw_to_local(hw);
 407
 408         napi_schedule(&local->napi);
 409 }
 410 EXPORT_SYMBOL(ieee80211_napi_schedule);
 411
 412 void ieee80211_napi_complete(struct ieee80211_hw *hw)
 413 {
 414         struct ieee80211_local *local = hw_to_local(hw);
 415
 416         napi_complete(&local->napi);
 417 }
 418 EXPORT_SYMBOL(ieee80211_napi_complete);
 419
 420 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 421                                         const struct ieee80211_ops *ops)
 422 {
 423         struct ieee80211_local *local;
 424         int priv_size, i;
 425         struct wiphy *wiphy;
 426
 427         /* Ensure 32-byte alignment of our private data and hw private data.
 428          * We use the wiphy priv data for both our ieee80211_local and for
 429          * the driver's private data
 430          *
 431          * In memory it'll be like this:
 432          *
 433          * +-------------------------+
 434          * | struct wiphy           |
 435          * +-------------------------+
 436          * | struct ieee80211_local  |
 437          * +-------------------------+
 438          * | driver's private data   |
 439          * +-------------------------+
 440          *
 441          */
 442         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 443
 444         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 445
 446         if (!wiphy)
 447                 return NULL;
 448
 449         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 450                         WIPHY_FLAG_4ADDR_AP |
 451                         WIPHY_FLAG_4ADDR_STATION;
 452         wiphy->privid = mac80211_wiphy_privid;
 453
 454         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 455
 456         local = wiphy_priv(wiphy);
 457
 458         local->hw.wiphy = wiphy;
 459
 460         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 461
 462         BUG_ON(!ops->tx);
 463         BUG_ON(!ops->start);
 464         BUG_ON(!ops->stop);
 465         BUG_ON(!ops->config);
 466         BUG_ON(!ops->add_interface);
 467         BUG_ON(!ops->remove_interface);
 468         BUG_ON(!ops->configure_filter);
 469         local->ops = ops;
 470
 471         /* set up some defaults */
 472         local->hw.queues = 1;
 473         local->hw.max_rates = 1;
 474         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 475         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 476         local->user_power_level = -1;
 477         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 478         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 479
 480         INIT_LIST_HEAD(&local->interfaces);
 481
 482         __hw_addr_init(&local->mc_list);
 483
 484         mutex_init(&local->iflist_mtx);
 485         mutex_init(&local->mtx);
 486
 487         mutex_init(&local->key_mtx);
 488         spin_lock_init(&local->filter_lock);
 489         spin_lock_init(&local->queue_stop_reason_lock);
 490
 491         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 492
 493         ieee80211_work_init(local);
 494
 495         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 496
 497         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 498         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
 499         local->smps_mode = IEEE80211_SMPS_OFF;
 500
 501         INIT_WORK(&local->dynamic_ps_enable_work,
 502                   ieee80211_dynamic_ps_enable_work);
 503         INIT_WORK(&local->dynamic_ps_disable_work,
 504                   ieee80211_dynamic_ps_disable_work);
 505         setup_timer(&local->dynamic_ps_timer,
 506                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 507
 508         sta_info_init(local);
 509
 510         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 511                 skb_queue_head_init(&local->pending[i]);
 512                 atomic_set(&local->agg_queue_stop[i], 0);
 513         }
 514         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 515                      (unsigned long)local);
 516
 517         tasklet_init(&local->tasklet,
 518                      ieee80211_tasklet_handler,
 519                      (unsigned long) local);
 520
 521         skb_queue_head_init(&local->skb_queue);
 522         skb_queue_head_init(&local->skb_queue_unreliable);
 523
 524         /* init dummy netdev for use w/ NAPI */
 525         init_dummy_netdev(&local->napi_dev);
 526
 527         return local_to_hw(local);
 528 }
 529 EXPORT_SYMBOL(ieee80211_alloc_hw);
 530
 531 int ieee80211_register_hw(struct ieee80211_hw *hw)
 532 {
 533         struct ieee80211_local *local = hw_to_local(hw);
 534         int result;
 535         enum ieee80211_band band;
 536         int channels, max_bitrates;
 537         bool supp_ht;
 538         static const u32 cipher_suites[] = {
 539                 WLAN_CIPHER_SUITE_WEP40,
 540                 WLAN_CIPHER_SUITE_WEP104,
 541                 WLAN_CIPHER_SUITE_TKIP,
 542                 WLAN_CIPHER_SUITE_CCMP,
 543
 544                 /* keep last -- depends on hw flags! */
 545                 WLAN_CIPHER_SUITE_AES_CMAC
 546         };
 547
 548         /*
 549          * generic code guarantees at least one band,
 550          * set this very early because much code assumes
 551          * that hw.conf.channel is assigned
 552          */
 553         channels = 0;
 554         max_bitrates = 0;
 555         supp_ht = false;
 556         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 557                 struct ieee80211_supported_band *sband;
 558
 559                 sband = local->hw.wiphy->bands[band];
 560                 if (!sband)
 561                         continue;
 562                 if (!local->oper_channel) {
 563                         /* init channel we're on */
 564                         local->hw.conf.channel =
 565                         local->oper_channel = &sband->channels[0];
 566                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 567                 }
 568                 channels += sband->n_channels;
 569
 570                 if (max_bitrates < sband->n_bitrates)
 571                         max_bitrates = sband->n_bitrates;
 572                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 573         }
 574
 575         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 576                                       sizeof(void *) * channels, GFP_KERNEL);
 577         if (!local->int_scan_req)
 578                 return -ENOMEM;
 579
 580         /* if low-level driver supports AP, we also support VLAN */
 581         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 582                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 583
 584         /* mac80211 always supports monitor */
 585         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 586
 587         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 588                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 589         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 590                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 591
 592         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 593              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 594              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 595
 596         /*
 597          * Calculate scan IE length -- we need this to alloc
 598          * memory and to subtract from the driver limit. It
 599          * includes the (extended) supported rates and HT
 600          * information -- SSID is the driver's responsibility.
 601          */
 602         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
 603         if (supp_ht)
 604                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 605
 606         if (!local->ops->hw_scan) {
 607                 /* For hw_scan, driver needs to set these up. */
 608                 local->hw.wiphy->max_scan_ssids = 4;
 609                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 610         }
 611
 612         /*
 613          * If the driver supports any scan IEs, then assume the
 614          * limit includes the IEs mac80211 will add, otherwise
 615          * leave it at zero and let the driver sort it out; we
 616          * still pass our IEs to the driver but userspace will
 617          * not be allowed to in that case.
 618          */
 619         if (local->hw.wiphy->max_scan_ie_len)
 620                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 621
 622         local->hw.wiphy->cipher_suites = cipher_suites;
 623         local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 624         if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 625                 local->hw.wiphy->n_cipher_suites--;
 626
 627         result = wiphy_register(local->hw.wiphy);
 628         if (result < 0)
 629                 goto fail_wiphy_register;
 630
 631         /*
 632          * We use the number of queues for feature tests (QoS, HT) internally
 633          * so restrict them appropriately.
 634          */
 635         if (hw->queues > IEEE80211_MAX_QUEUES)
 636                 hw->queues = IEEE80211_MAX_QUEUES;
 637
 638         local->workqueue =
 639                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
 640         if (!local->workqueue) {
 641                 result = -ENOMEM;
 642                 goto fail_workqueue;
 643         }
 644
 645         /*
 646          * The hardware needs headroom for sending the frame,
 647          * and we need some headroom for passing the frame to monitor
 648          * interfaces, but never both at the same time.
 649          */
 650         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
 651                         sizeof(struct ieee80211_tx_status_rtap_hdr));
 652         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 653                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 654
 655         debugfs_hw_add(local);
 656
 657         /*
 658          * if the driver doesn't specify a max listen interval we
 659          * use 5 which should be a safe default
 660          */
 661         if (local->hw.max_listen_interval == 0)
 662                 local->hw.max_listen_interval = 5;
 663
 664         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 665
 666         local->dynamic_ps_forced_timeout = -1;
 667
 668         result = sta_info_start(local);
 669         if (result < 0)
 670                 goto fail_sta_info;
 671
 672         result = ieee80211_wep_init(local);
 673         if (result < 0)
 674                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
 675                        wiphy_name(local->hw.wiphy), result);
 676
 677         rtnl_lock();
 678
 679         result = ieee80211_init_rate_ctrl_alg(local,
 680                                               hw->rate_control_algorithm);
 681         if (result < 0) {
 682                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
 683                        "algorithm\n", wiphy_name(local->hw.wiphy));
 684                 goto fail_rate;
 685         }
 686
 687         /* add one default STA interface if supported */
 688         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 689                 result = ieee80211_if_add(local, "wlan%d", NULL,
 690                                           NL80211_IFTYPE_STATION, NULL);
 691                 if (result)
 692                         printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
 693                                wiphy_name(local->hw.wiphy));
 694         }
 695
 696         rtnl_unlock();
 697
 698         ieee80211_led_init(local);
 699
 700         local->network_latency_notifier.notifier_call =
 701                 ieee80211_max_network_latency;
 702         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 703                                      &local->network_latency_notifier);
 704         if (result) {
 705                 rtnl_lock();
 706                 goto fail_pm_qos;
 707         }
 708
 709 #ifdef CONFIG_INET
 710         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 711         result = register_inetaddr_notifier(&local->ifa_notifier);
 712         if (result)
 713                 goto fail_ifa;
 714 #endif
 715
 716         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
 717                         local->hw.napi_weight);
 718
 719         return 0;
 720
 721 #ifdef CONFIG_INET
 722  fail_ifa:
 723         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 724                                &local->network_latency_notifier);
 725         rtnl_lock();
 726 #endif
 727  fail_pm_qos:
 728         ieee80211_led_exit(local);
 729         ieee80211_remove_interfaces(local);
 730  fail_rate:
 731         rtnl_unlock();
 732         ieee80211_wep_free(local);
 733         sta_info_stop(local);
 734  fail_sta_info:
 735         destroy_workqueue(local->workqueue);
 736  fail_workqueue:
 737         wiphy_unregister(local->hw.wiphy);
 738  fail_wiphy_register:
 739         kfree(local->int_scan_req);
 740         return result;
 741 }
 742 EXPORT_SYMBOL(ieee80211_register_hw);
 743
 744 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 745 {
 746         struct ieee80211_local *local = hw_to_local(hw);
 747
 748         tasklet_kill(&local->tx_pending_tasklet);
 749         tasklet_kill(&local->tasklet);
 750
 751         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 752                                &local->network_latency_notifier);
 753 #ifdef CONFIG_INET
 754         unregister_inetaddr_notifier(&local->ifa_notifier);
 755 #endif
 756
 757         rtnl_lock();
 758
 759         /*
 760          * At this point, interface list manipulations are fine
 761          * because the driver cannot be handing us frames any
 762          * more and the tasklet is killed.
 763          */
 764         ieee80211_remove_interfaces(local);
 765
 766         rtnl_unlock();
 767
 768         cancel_work_sync(&local->reconfig_filter);
 769
 770         ieee80211_clear_tx_pending(local);
 771         sta_info_stop(local);
 772         rate_control_deinitialize(local);
 773
 774         if (skb_queue_len(&local->skb_queue) ||
 775             skb_queue_len(&local->skb_queue_unreliable))
 776                 printk(KERN_WARNING "%s: skb_queue not empty\n",
 777                        wiphy_name(local->hw.wiphy));
 778         skb_queue_purge(&local->skb_queue);
 779         skb_queue_purge(&local->skb_queue_unreliable);
 780
 781         destroy_workqueue(local->workqueue);
 782         wiphy_unregister(local->hw.wiphy);
 783         ieee80211_wep_free(local);
 784         ieee80211_led_exit(local);
 785         kfree(local->int_scan_req);
 786 }
 787 EXPORT_SYMBOL(ieee80211_unregister_hw);
 788
 789 void ieee80211_free_hw(struct ieee80211_hw *hw)
 790 {
 791         struct ieee80211_local *local = hw_to_local(hw);
 792
 793         mutex_destroy(&local->iflist_mtx);
 794         mutex_destroy(&local->mtx);
 795
 796         wiphy_free(local->hw.wiphy);
 797 }
 798 EXPORT_SYMBOL(ieee80211_free_hw);
 799
 800 static int __init ieee80211_init(void)
 801 {
 802         struct sk_buff *skb;
 803         int ret;
 804
 805         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
 806         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
 807                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
 808
 809         ret = rc80211_minstrel_init();
 810         if (ret)
 811                 return ret;
 812
 813         ret = rc80211_minstrel_ht_init();
 814         if (ret)
 815                 goto err_minstrel;
 816
 817         ret = rc80211_pid_init();
 818         if (ret)
 819                 goto err_pid;
 820
 821         ret = ieee80211_iface_init();
 822         if (ret)
 823                 goto err_netdev;
 824
 825         return 0;
 826  err_netdev:
 827         rc80211_pid_exit();
 828  err_pid:
 829         rc80211_minstrel_ht_exit();
 830  err_minstrel:
 831         rc80211_minstrel_exit();
 832
 833         return ret;
 834 }
 835
 836 static void __exit ieee80211_exit(void)
 837 {
 838         rc80211_pid_exit();
 839         rc80211_minstrel_ht_exit();
 840         rc80211_minstrel_exit();
 841
 842         /*
 843          * For key todo, it'll be empty by now but the work
 844          * might still be scheduled.
 845          */
 846         flush_scheduled_work();
 847
 848         if (mesh_allocated)
 849                 ieee80211s_stop();
 850
 851         ieee80211_iface_exit();
 852 }
 853
 854
 855 subsys_initcall(ieee80211_init);
 856 module_exit(ieee80211_exit);
 857
 858 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
 859 MODULE_LICENSE("GPL");