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         WARN(test_bit(SCAN_HW_SCANNING, &local->scanning),
 309                 "%s called with hardware scan in progress\n", __func__);
 310
 311         if (unlikely(test_bit(SCAN_SW_SCANNING, &local->scanning)))
 312                 ieee80211_scan_cancel(local);
 313
 314         /* use this reason, ieee80211_reconfig will unblock it */
 315         ieee80211_stop_queues_by_reason(hw,
 316                 IEEE80211_QUEUE_STOP_REASON_SUSPEND);
 317
 318         schedule_work(&local->restart_work);
 319 }
 320 EXPORT_SYMBOL(ieee80211_restart_hw);
 321
 322 static void ieee80211_recalc_smps_work(struct work_struct *work)
 323 {
 324         struct ieee80211_local *local =
 325                 container_of(work, struct ieee80211_local, recalc_smps);
 326
 327         mutex_lock(&local->iflist_mtx);
 328         ieee80211_recalc_smps(local, NULL);
 329         mutex_unlock(&local->iflist_mtx);
 330 }
 331
 332 #ifdef CONFIG_INET
 333 static int ieee80211_ifa_changed(struct notifier_block *nb,
 334                                  unsigned long data, void *arg)
 335 {
 336         struct in_ifaddr *ifa = arg;
 337         struct ieee80211_local *local =
 338                 container_of(nb, struct ieee80211_local,
 339                              ifa_notifier);
 340         struct net_device *ndev = ifa->ifa_dev->dev;
 341         struct wireless_dev *wdev = ndev->ieee80211_ptr;
 342         struct in_device *idev;
 343         struct ieee80211_sub_if_data *sdata;
 344         struct ieee80211_bss_conf *bss_conf;
 345         struct ieee80211_if_managed *ifmgd;
 346         int c = 0;
 347
 348         /* Make sure it's our interface that got changed */
 349         if (!wdev)
 350                 return NOTIFY_DONE;
 351
 352         if (wdev->wiphy != local->hw.wiphy)
 353                 return NOTIFY_DONE;
 354
 355         sdata = IEEE80211_DEV_TO_SUB_IF(ndev);
 356         bss_conf = &sdata->vif.bss_conf;
 357
 358         if (!ieee80211_sdata_running(sdata))
 359                 return NOTIFY_DONE;
 360
 361         /* ARP filtering is only supported in managed mode */
 362         if (sdata->vif.type != NL80211_IFTYPE_STATION)
 363                 return NOTIFY_DONE;
 364
 365         idev = sdata->dev->ip_ptr;
 366         if (!idev)
 367                 return NOTIFY_DONE;
 368
 369         ifmgd = &sdata->u.mgd;
 370         mutex_lock(&ifmgd->mtx);
 371
 372         /* Copy the addresses to the bss_conf list */
 373         ifa = idev->ifa_list;
 374         while (c < IEEE80211_BSS_ARP_ADDR_LIST_LEN && ifa) {
 375                 bss_conf->arp_addr_list[c] = ifa->ifa_address;
 376                 ifa = ifa->ifa_next;
 377                 c++;
 378         }
 379
 380         /* If not all addresses fit the list, disable filtering */
 381         if (ifa) {
 382                 sdata->arp_filter_state = false;
 383                 c = 0;
 384         } else {
 385                 sdata->arp_filter_state = true;
 386         }
 387         bss_conf->arp_addr_cnt = c;
 388
 389         /* Configure driver only if associated */
 390         if (ifmgd->associated) {
 391                 bss_conf->arp_filter_enabled = sdata->arp_filter_state;
 392                 ieee80211_bss_info_change_notify(sdata,
 393                                                  BSS_CHANGED_ARP_FILTER);
 394         }
 395
 396         mutex_unlock(&ifmgd->mtx);
 397
 398         return NOTIFY_DONE;
 399 }
 400 #endif
 401
 402 static int ieee80211_napi_poll(struct napi_struct *napi, int budget)
 403 {
 404         struct ieee80211_local *local =
 405                 container_of(napi, struct ieee80211_local, napi);
 406
 407         return local->ops->napi_poll(&local->hw, budget);
 408 }
 409
 410 void ieee80211_napi_schedule(struct ieee80211_hw *hw)
 411 {
 412         struct ieee80211_local *local = hw_to_local(hw);
 413
 414         napi_schedule(&local->napi);
 415 }
 416 EXPORT_SYMBOL(ieee80211_napi_schedule);
 417
 418 void ieee80211_napi_complete(struct ieee80211_hw *hw)
 419 {
 420         struct ieee80211_local *local = hw_to_local(hw);
 421
 422         napi_complete(&local->napi);
 423 }
 424 EXPORT_SYMBOL(ieee80211_napi_complete);
 425
 426 /* There isn't a lot of sense in it, but you can transmit anything you like */
 427 static const struct ieee80211_txrx_stypes
 428 ieee80211_default_mgmt_stypes[NUM_NL80211_IFTYPES] = {
 429         [NL80211_IFTYPE_ADHOC] = {
 430                 .tx = 0xffff,
 431                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4),
 432         },
 433         [NL80211_IFTYPE_STATION] = {
 434                 .tx = 0xffff,
 435                 .rx = BIT(IEEE80211_STYPE_ACTION >> 4) |
 436                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4),
 437         },
 438         [NL80211_IFTYPE_AP] = {
 439                 .tx = 0xffff,
 440                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 441                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 442                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 443                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 444                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 445                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 446                         BIT(IEEE80211_STYPE_ACTION >> 4),
 447         },
 448         [NL80211_IFTYPE_AP_VLAN] = {
 449                 /* copy AP */
 450                 .tx = 0xffff,
 451                 .rx = BIT(IEEE80211_STYPE_ASSOC_REQ >> 4) |
 452                         BIT(IEEE80211_STYPE_REASSOC_REQ >> 4) |
 453                         BIT(IEEE80211_STYPE_PROBE_REQ >> 4) |
 454                         BIT(IEEE80211_STYPE_DISASSOC >> 4) |
 455                         BIT(IEEE80211_STYPE_AUTH >> 4) |
 456                         BIT(IEEE80211_STYPE_DEAUTH >> 4) |
 457                         BIT(IEEE80211_STYPE_ACTION >> 4),
 458         },
 459 };
 460
 461 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 462                                         const struct ieee80211_ops *ops)
 463 {
 464         struct ieee80211_local *local;
 465         int priv_size, i;
 466         struct wiphy *wiphy;
 467
 468         /* Ensure 32-byte alignment of our private data and hw private data.
 469          * We use the wiphy priv data for both our ieee80211_local and for
 470          * the driver's private data
 471          *
 472          * In memory it'll be like this:
 473          *
 474          * +-------------------------+
 475          * | struct wiphy           |
 476          * +-------------------------+
 477          * | struct ieee80211_local  |
 478          * +-------------------------+
 479          * | driver's private data   |
 480          * +-------------------------+
 481          *
 482          */
 483         priv_size = ALIGN(sizeof(*local), NETDEV_ALIGN) + priv_data_len;
 484
 485         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 486
 487         if (!wiphy)
 488                 return NULL;
 489
 490         wiphy->mgmt_stypes = ieee80211_default_mgmt_stypes;
 491
 492         wiphy->flags |= WIPHY_FLAG_NETNS_OK |
 493                         WIPHY_FLAG_4ADDR_AP |
 494                         WIPHY_FLAG_4ADDR_STATION;
 495         wiphy->privid = mac80211_wiphy_privid;
 496
 497         wiphy->bss_priv_size = sizeof(struct ieee80211_bss);
 498
 499         local = wiphy_priv(wiphy);
 500
 501         local->hw.wiphy = wiphy;
 502
 503         local->hw.priv = (char *)local + ALIGN(sizeof(*local), NETDEV_ALIGN);
 504
 505         BUG_ON(!ops->tx);
 506         BUG_ON(!ops->start);
 507         BUG_ON(!ops->stop);
 508         BUG_ON(!ops->config);
 509         BUG_ON(!ops->add_interface);
 510         BUG_ON(!ops->remove_interface);
 511         BUG_ON(!ops->configure_filter);
 512         local->ops = ops;
 513
 514         /* set up some defaults */
 515         local->hw.queues = 1;
 516         local->hw.max_rates = 1;
 517         local->hw.conf.long_frame_max_tx_count = wiphy->retry_long;
 518         local->hw.conf.short_frame_max_tx_count = wiphy->retry_short;
 519         local->user_power_level = -1;
 520         local->uapsd_queues = IEEE80211_DEFAULT_UAPSD_QUEUES;
 521         local->uapsd_max_sp_len = IEEE80211_DEFAULT_MAX_SP_LEN;
 522
 523         INIT_LIST_HEAD(&local->interfaces);
 524
 525         __hw_addr_init(&local->mc_list);
 526
 527         mutex_init(&local->iflist_mtx);
 528         mutex_init(&local->mtx);
 529
 530         mutex_init(&local->key_mtx);
 531         spin_lock_init(&local->filter_lock);
 532         spin_lock_init(&local->queue_stop_reason_lock);
 533
 534         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
 535
 536         ieee80211_work_init(local);
 537
 538         INIT_WORK(&local->restart_work, ieee80211_restart_work);
 539
 540         INIT_WORK(&local->reconfig_filter, ieee80211_reconfig_filter);
 541         INIT_WORK(&local->recalc_smps, ieee80211_recalc_smps_work);
 542         local->smps_mode = IEEE80211_SMPS_OFF;
 543
 544         INIT_WORK(&local->dynamic_ps_enable_work,
 545                   ieee80211_dynamic_ps_enable_work);
 546         INIT_WORK(&local->dynamic_ps_disable_work,
 547                   ieee80211_dynamic_ps_disable_work);
 548         setup_timer(&local->dynamic_ps_timer,
 549                     ieee80211_dynamic_ps_timer, (unsigned long) local);
 550
 551         sta_info_init(local);
 552
 553         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 554                 skb_queue_head_init(&local->pending[i]);
 555                 atomic_set(&local->agg_queue_stop[i], 0);
 556         }
 557         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 558                      (unsigned long)local);
 559
 560         tasklet_init(&local->tasklet,
 561                      ieee80211_tasklet_handler,
 562                      (unsigned long) local);
 563
 564         skb_queue_head_init(&local->skb_queue);
 565         skb_queue_head_init(&local->skb_queue_unreliable);
 566
 567         /* init dummy netdev for use w/ NAPI */
 568         init_dummy_netdev(&local->napi_dev);
 569
 570         return local_to_hw(local);
 571 }
 572 EXPORT_SYMBOL(ieee80211_alloc_hw);
 573
 574 int ieee80211_register_hw(struct ieee80211_hw *hw)
 575 {
 576         struct ieee80211_local *local = hw_to_local(hw);
 577         int result;
 578         enum ieee80211_band band;
 579         int channels, max_bitrates;
 580         bool supp_ht;
 581         static const u32 cipher_suites[] = {
 582                 /* keep WEP first, it may be removed below */
 583                 WLAN_CIPHER_SUITE_WEP40,
 584                 WLAN_CIPHER_SUITE_WEP104,
 585                 WLAN_CIPHER_SUITE_TKIP,
 586                 WLAN_CIPHER_SUITE_CCMP,
 587
 588                 /* keep last -- depends on hw flags! */
 589                 WLAN_CIPHER_SUITE_AES_CMAC
 590         };
 591
 592         /*
 593          * generic code guarantees at least one band,
 594          * set this very early because much code assumes
 595          * that hw.conf.channel is assigned
 596          */
 597         channels = 0;
 598         max_bitrates = 0;
 599         supp_ht = false;
 600         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
 601                 struct ieee80211_supported_band *sband;
 602
 603                 sband = local->hw.wiphy->bands[band];
 604                 if (!sband)
 605                         continue;
 606                 if (!local->oper_channel) {
 607                         /* init channel we're on */
 608                         local->hw.conf.channel =
 609                         local->oper_channel = &sband->channels[0];
 610                         local->hw.conf.channel_type = NL80211_CHAN_NO_HT;
 611                 }
 612                 channels += sband->n_channels;
 613
 614                 if (max_bitrates < sband->n_bitrates)
 615                         max_bitrates = sband->n_bitrates;
 616                 supp_ht = supp_ht || sband->ht_cap.ht_supported;
 617         }
 618
 619         local->int_scan_req = kzalloc(sizeof(*local->int_scan_req) +
 620                                       sizeof(void *) * channels, GFP_KERNEL);
 621         if (!local->int_scan_req)
 622                 return -ENOMEM;
 623
 624         /* if low-level driver supports AP, we also support VLAN */
 625         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
 626                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
 627
 628         /* mac80211 always supports monitor */
 629         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
 630
 631 #ifndef CONFIG_MAC80211_MESH
 632         /* mesh depends on Kconfig, but drivers should set it if they want */
 633         local->hw.wiphy->interface_modes &= ~BIT(NL80211_IFTYPE_MESH_POINT);
 634 #endif
 635
 636         /* mac80211 supports control port protocol changing */
 637         local->hw.wiphy->flags |= WIPHY_FLAG_CONTROL_PORT_PROTOCOL;
 638
 639         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
 640                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_MBM;
 641         else if (local->hw.flags & IEEE80211_HW_SIGNAL_UNSPEC)
 642                 local->hw.wiphy->signal_type = CFG80211_SIGNAL_TYPE_UNSPEC;
 643
 644         WARN((local->hw.flags & IEEE80211_HW_SUPPORTS_UAPSD)
 645              && (local->hw.flags & IEEE80211_HW_PS_NULLFUNC_STACK),
 646              "U-APSD not supported with HW_PS_NULLFUNC_STACK\n");
 647
 648         /*
 649          * Calculate scan IE length -- we need this to alloc
 650          * memory and to subtract from the driver limit. It
 651          * includes the (extended) supported rates and HT
 652          * information -- SSID is the driver's responsibility.
 653          */
 654         local->scan_ies_len = 4 + max_bitrates; /* (ext) supp rates */
 655         if (supp_ht)
 656                 local->scan_ies_len += 2 + sizeof(struct ieee80211_ht_cap);
 657
 658         if (!local->ops->hw_scan) {
 659                 /* For hw_scan, driver needs to set these up. */
 660                 local->hw.wiphy->max_scan_ssids = 4;
 661                 local->hw.wiphy->max_scan_ie_len = IEEE80211_MAX_DATA_LEN;
 662         }
 663
 664         /*
 665          * If the driver supports any scan IEs, then assume the
 666          * limit includes the IEs mac80211 will add, otherwise
 667          * leave it at zero and let the driver sort it out; we
 668          * still pass our IEs to the driver but userspace will
 669          * not be allowed to in that case.
 670          */
 671         if (local->hw.wiphy->max_scan_ie_len)
 672                 local->hw.wiphy->max_scan_ie_len -= local->scan_ies_len;
 673
 674         /* Set up cipher suites unless driver already did */
 675         if (!local->hw.wiphy->cipher_suites) {
 676                 local->hw.wiphy->cipher_suites = cipher_suites;
 677                 local->hw.wiphy->n_cipher_suites = ARRAY_SIZE(cipher_suites);
 678                 if (!(local->hw.flags & IEEE80211_HW_MFP_CAPABLE))
 679                         local->hw.wiphy->n_cipher_suites--;
 680         }
 681         if (IS_ERR(local->wep_tx_tfm) || IS_ERR(local->wep_rx_tfm)) {
 682                 if (local->hw.wiphy->cipher_suites == cipher_suites) {
 683                         local->hw.wiphy->cipher_suites += 2;
 684                         local->hw.wiphy->n_cipher_suites -= 2;
 685                 } else {
 686                         u32 *suites;
 687                         int r, w = 0;
 688
 689                         /* Filter out WEP */
 690
 691                         suites = kmemdup(
 692                                 local->hw.wiphy->cipher_suites,
 693                                 sizeof(u32) * local->hw.wiphy->n_cipher_suites,
 694                                 GFP_KERNEL);
 695                         if (!suites)
 696                                 return -ENOMEM;
 697                         for (r = 0; r < local->hw.wiphy->n_cipher_suites; r++) {
 698                                 u32 suite = local->hw.wiphy->cipher_suites[r];
 699                                 if (suite == WLAN_CIPHER_SUITE_WEP40 ||
 700                                     suite == WLAN_CIPHER_SUITE_WEP104)
 701                                         continue;
 702                                 suites[w++] = suite;
 703                         }
 704                         local->hw.wiphy->cipher_suites = suites;
 705                         local->hw.wiphy->n_cipher_suites = w;
 706                         local->wiphy_ciphers_allocated = true;
 707                 }
 708         }
 709
 710         result = wiphy_register(local->hw.wiphy);
 711         if (result < 0)
 712                 goto fail_wiphy_register;
 713
 714         /*
 715          * We use the number of queues for feature tests (QoS, HT) internally
 716          * so restrict them appropriately.
 717          */
 718         if (hw->queues > IEEE80211_MAX_QUEUES)
 719                 hw->queues = IEEE80211_MAX_QUEUES;
 720
 721         local->workqueue =
 722                 create_singlethread_workqueue(wiphy_name(local->hw.wiphy));
 723         if (!local->workqueue) {
 724                 result = -ENOMEM;
 725                 goto fail_workqueue;
 726         }
 727
 728         /*
 729          * The hardware needs headroom for sending the frame,
 730          * and we need some headroom for passing the frame to monitor
 731          * interfaces, but never both at the same time.
 732          */
 733         BUILD_BUG_ON(IEEE80211_TX_STATUS_HEADROOM !=
 734                         sizeof(struct ieee80211_tx_status_rtap_hdr));
 735         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
 736                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
 737
 738         debugfs_hw_add(local);
 739
 740         /*
 741          * if the driver doesn't specify a max listen interval we
 742          * use 5 which should be a safe default
 743          */
 744         if (local->hw.max_listen_interval == 0)
 745                 local->hw.max_listen_interval = 5;
 746
 747         local->hw.conf.listen_interval = local->hw.max_listen_interval;
 748
 749         local->dynamic_ps_forced_timeout = -1;
 750
 751         result = sta_info_start(local);
 752         if (result < 0)
 753                 goto fail_sta_info;
 754
 755         result = ieee80211_wep_init(local);
 756         if (result < 0)
 757                 wiphy_debug(local->hw.wiphy, "Failed to initialize wep: %d\n",
 758                             result);
 759
 760         rtnl_lock();
 761
 762         result = ieee80211_init_rate_ctrl_alg(local,
 763                                               hw->rate_control_algorithm);
 764         if (result < 0) {
 765                 wiphy_debug(local->hw.wiphy,
 766                             "Failed to initialize rate control algorithm\n");
 767                 goto fail_rate;
 768         }
 769
 770         /* add one default STA interface if supported */
 771         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_STATION)) {
 772                 result = ieee80211_if_add(local, "wlan%d", NULL,
 773                                           NL80211_IFTYPE_STATION, NULL);
 774                 if (result)
 775                         wiphy_warn(local->hw.wiphy,
 776                                    "Failed to add default virtual iface\n");
 777         }
 778
 779         rtnl_unlock();
 780
 781         ieee80211_led_init(local);
 782
 783         local->network_latency_notifier.notifier_call =
 784                 ieee80211_max_network_latency;
 785         result = pm_qos_add_notifier(PM_QOS_NETWORK_LATENCY,
 786                                      &local->network_latency_notifier);
 787         if (result) {
 788                 rtnl_lock();
 789                 goto fail_pm_qos;
 790         }
 791
 792 #ifdef CONFIG_INET
 793         local->ifa_notifier.notifier_call = ieee80211_ifa_changed;
 794         result = register_inetaddr_notifier(&local->ifa_notifier);
 795         if (result)
 796                 goto fail_ifa;
 797 #endif
 798
 799         netif_napi_add(&local->napi_dev, &local->napi, ieee80211_napi_poll,
 800                         local->hw.napi_weight);
 801
 802         return 0;
 803
 804 #ifdef CONFIG_INET
 805  fail_ifa:
 806         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 807                                &local->network_latency_notifier);
 808         rtnl_lock();
 809 #endif
 810  fail_pm_qos:
 811         ieee80211_led_exit(local);
 812         ieee80211_remove_interfaces(local);
 813  fail_rate:
 814         rtnl_unlock();
 815         ieee80211_wep_free(local);
 816         sta_info_stop(local);
 817  fail_sta_info:
 818         destroy_workqueue(local->workqueue);
 819  fail_workqueue:
 820         wiphy_unregister(local->hw.wiphy);
 821  fail_wiphy_register:
 822         if (local->wiphy_ciphers_allocated)
 823                 kfree(local->hw.wiphy->cipher_suites);
 824         kfree(local->int_scan_req);
 825         return result;
 826 }
 827 EXPORT_SYMBOL(ieee80211_register_hw);
 828
 829 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
 830 {
 831         struct ieee80211_local *local = hw_to_local(hw);
 832
 833         tasklet_kill(&local->tx_pending_tasklet);
 834         tasklet_kill(&local->tasklet);
 835
 836         pm_qos_remove_notifier(PM_QOS_NETWORK_LATENCY,
 837                                &local->network_latency_notifier);
 838 #ifdef CONFIG_INET
 839         unregister_inetaddr_notifier(&local->ifa_notifier);
 840 #endif
 841
 842         rtnl_lock();
 843
 844         /*
 845          * At this point, interface list manipulations are fine
 846          * because the driver cannot be handing us frames any
 847          * more and the tasklet is killed.
 848          */
 849         ieee80211_remove_interfaces(local);
 850
 851         rtnl_unlock();
 852
 853         /*
 854          * Now all work items will be gone, but the
 855          * timer might still be armed, so delete it
 856          */
 857         del_timer_sync(&local->work_timer);
 858
 859         cancel_work_sync(&local->restart_work);
 860         cancel_work_sync(&local->reconfig_filter);
 861
 862         ieee80211_clear_tx_pending(local);
 863         sta_info_stop(local);
 864         rate_control_deinitialize(local);
 865
 866         if (skb_queue_len(&local->skb_queue) ||
 867             skb_queue_len(&local->skb_queue_unreliable))
 868                 wiphy_warn(local->hw.wiphy, "skb_queue not empty\n");
 869         skb_queue_purge(&local->skb_queue);
 870         skb_queue_purge(&local->skb_queue_unreliable);
 871
 872         destroy_workqueue(local->workqueue);
 873         wiphy_unregister(local->hw.wiphy);
 874         ieee80211_wep_free(local);
 875         ieee80211_led_exit(local);
 876         kfree(local->int_scan_req);
 877 }
 878 EXPORT_SYMBOL(ieee80211_unregister_hw);
 879
 880 void ieee80211_free_hw(struct ieee80211_hw *hw)
 881 {
 882         struct ieee80211_local *local = hw_to_local(hw);
 883
 884         mutex_destroy(&local->iflist_mtx);
 885         mutex_destroy(&local->mtx);
 886
 887         if (local->wiphy_ciphers_allocated)
 888                 kfree(local->hw.wiphy->cipher_suites);
 889
 890         wiphy_free(local->hw.wiphy);
 891 }
 892 EXPORT_SYMBOL(ieee80211_free_hw);
 893
 894 static int __init ieee80211_init(void)
 895 {
 896         struct sk_buff *skb;
 897         int ret;
 898
 899         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
 900         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
 901                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
 902
 903         ret = rc80211_minstrel_init();
 904         if (ret)
 905                 return ret;
 906
 907         ret = rc80211_minstrel_ht_init();
 908         if (ret)
 909                 goto err_minstrel;
 910
 911         ret = rc80211_pid_init();
 912         if (ret)
 913                 goto err_pid;
 914
 915         ret = ieee80211_iface_init();
 916         if (ret)
 917                 goto err_netdev;
 918
 919         return 0;
 920  err_netdev:
 921         rc80211_pid_exit();
 922  err_pid:
 923         rc80211_minstrel_ht_exit();
 924  err_minstrel:
 925         rc80211_minstrel_exit();
 926
 927         return ret;
 928 }
 929
 930 static void __exit ieee80211_exit(void)
 931 {
 932         rc80211_pid_exit();
 933         rc80211_minstrel_ht_exit();
 934         rc80211_minstrel_exit();
 935
 936         /*
 937          * For key todo, it'll be empty by now but the work
 938          * might still be scheduled.
 939          */
 940         flush_scheduled_work();
 941
 942         if (mesh_allocated)
 943                 ieee80211s_stop();
 944
 945         ieee80211_iface_exit();
 946 }
 947
 948
 949 subsys_initcall(ieee80211_init);
 950 module_exit(ieee80211_exit);
 951
 952 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
 953 MODULE_LICENSE("GPL");