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 <net/ieee80211_radiotap.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/types.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/wireless.h>
  22 #include <linux/rtnetlink.h>
  23 #include <linux/bitmap.h>
  24 #include <net/net_namespace.h>
  25 #include <net/cfg80211.h>
  26
  27 #include "ieee80211_i.h"
  28 #include "rate.h"
  29 #include "mesh.h"
  30 #include "wep.h"
  31 #include "wme.h"
  32 #include "aes_ccm.h"
  33 #include "led.h"
  34 #include "cfg.h"
  35 #include "debugfs.h"
  36 #include "debugfs_netdev.h"
  37
  38 /*
  39  * For seeing transmitted packets on monitor interfaces
  40  * we have a radiotap header too.
  41  */
  42 struct ieee80211_tx_status_rtap_hdr {
  43         struct ieee80211_radiotap_header hdr;
  44         __le16 tx_flags;
  45         u8 data_retries;
  46 } __attribute__ ((packed));
  47
  48 /* common interface routines */
  49
  50 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
  51 {
  52         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
  53         return ETH_ALEN;
  54 }
  55
  56 /* must be called under mdev tx lock */
  57 static void ieee80211_configure_filter(struct ieee80211_local *local)
  58 {
  59         unsigned int changed_flags;
  60         unsigned int new_flags = 0;
  61
  62         if (atomic_read(&local->iff_promiscs))
  63                 new_flags |= FIF_PROMISC_IN_BSS;
  64
  65         if (atomic_read(&local->iff_allmultis))
  66                 new_flags |= FIF_ALLMULTI;
  67
  68         if (local->monitors)
  69                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  70
  71         if (local->fif_fcsfail)
  72                 new_flags |= FIF_FCSFAIL;
  73
  74         if (local->fif_plcpfail)
  75                 new_flags |= FIF_PLCPFAIL;
  76
  77         if (local->fif_control)
  78                 new_flags |= FIF_CONTROL;
  79
  80         if (local->fif_other_bss)
  81                 new_flags |= FIF_OTHER_BSS;
  82
  83         changed_flags = local->filter_flags ^ new_flags;
  84
  85         /* be a bit nasty */
  86         new_flags |= (1<<31);
  87
  88         local->ops->configure_filter(local_to_hw(local),
  89                                      changed_flags, &new_flags,
  90                                      local->mdev->mc_count,
  91                                      local->mdev->mc_list);
  92
  93         WARN_ON(new_flags & (1<<31));
  94
  95         local->filter_flags = new_flags & ~(1<<31);
  96 }
  97
  98 /* master interface */
  99
 100 static int ieee80211_master_open(struct net_device *dev)
 101 {
 102         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 103         struct ieee80211_sub_if_data *sdata;
 104         int res = -EOPNOTSUPP;
 105
 106         /* we hold the RTNL here so can safely walk the list */
 107         list_for_each_entry(sdata, &local->interfaces, list) {
 108                 if (netif_running(sdata->dev)) {
 109                         res = 0;
 110                         break;
 111                 }
 112         }
 113
 114         if (res)
 115                 return res;
 116
 117         netif_tx_start_all_queues(local->mdev);
 118
 119         return 0;
 120 }
 121
 122 static int ieee80211_master_stop(struct net_device *dev)
 123 {
 124         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 125         struct ieee80211_sub_if_data *sdata;
 126
 127         /* we hold the RTNL here so can safely walk the list */
 128         list_for_each_entry(sdata, &local->interfaces, list)
 129                 if (netif_running(sdata->dev))
 130                         dev_close(sdata->dev);
 131
 132         return 0;
 133 }
 134
 135 static void ieee80211_master_set_multicast_list(struct net_device *dev)
 136 {
 137         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 138
 139         ieee80211_configure_filter(local);
 140 }
 141
 142 /* regular interfaces */
 143
 144 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 145 {
 146         int meshhdrlen;
 147         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 148
 149         meshhdrlen = (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) ? 5 : 0;
 150
 151         /* FIX: what would be proper limits for MTU?
 152          * This interface uses 802.3 frames. */
 153         if (new_mtu < 256 ||
 154             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
 155                 return -EINVAL;
 156         }
 157
 158 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 159         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
 160 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 161         dev->mtu = new_mtu;
 162         return 0;
 163 }
 164
 165 static inline int identical_mac_addr_allowed(int type1, int type2)
 166 {
 167         return (type1 == IEEE80211_IF_TYPE_MNTR ||
 168                 type2 == IEEE80211_IF_TYPE_MNTR ||
 169                 (type1 == IEEE80211_IF_TYPE_AP &&
 170                  type2 == IEEE80211_IF_TYPE_WDS) ||
 171                 (type1 == IEEE80211_IF_TYPE_WDS &&
 172                  (type2 == IEEE80211_IF_TYPE_WDS ||
 173                   type2 == IEEE80211_IF_TYPE_AP)) ||
 174                 (type1 == IEEE80211_IF_TYPE_AP &&
 175                  type2 == IEEE80211_IF_TYPE_VLAN) ||
 176                 (type1 == IEEE80211_IF_TYPE_VLAN &&
 177                  (type2 == IEEE80211_IF_TYPE_AP ||
 178                   type2 == IEEE80211_IF_TYPE_VLAN)));
 179 }
 180
 181 static int ieee80211_open(struct net_device *dev)
 182 {
 183         struct ieee80211_sub_if_data *sdata, *nsdata;
 184         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 185         struct sta_info *sta;
 186         struct ieee80211_if_init_conf conf;
 187         u32 changed = 0;
 188         int res;
 189         bool need_hw_reconfig = 0;
 190
 191         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 192
 193         /* we hold the RTNL here so can safely walk the list */
 194         list_for_each_entry(nsdata, &local->interfaces, list) {
 195                 struct net_device *ndev = nsdata->dev;
 196
 197                 if (ndev != dev && netif_running(ndev)) {
 198                         /*
 199                          * Allow only a single IBSS interface to be up at any
 200                          * time. This is restricted because beacon distribution
 201                          * cannot work properly if both are in the same IBSS.
 202                          *
 203                          * To remove this restriction we'd have to disallow them
 204                          * from setting the same SSID on different IBSS interfaces
 205                          * belonging to the same hardware. Then, however, we're
 206                          * faced with having to adopt two different TSF timers...
 207                          */
 208                         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
 209                             nsdata->vif.type == IEEE80211_IF_TYPE_IBSS)
 210                                 return -EBUSY;
 211
 212                         /*
 213                          * The remaining checks are only performed for interfaces
 214                          * with the same MAC address.
 215                          */
 216                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 217                                 continue;
 218
 219                         /*
 220                          * check whether it may have the same address
 221                          */
 222                         if (!identical_mac_addr_allowed(sdata->vif.type,
 223                                                         nsdata->vif.type))
 224                                 return -ENOTUNIQ;
 225
 226                         /*
 227                          * can only add VLANs to enabled APs
 228                          */
 229                         if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN &&
 230                             nsdata->vif.type == IEEE80211_IF_TYPE_AP)
 231                                 sdata->bss = &nsdata->u.ap;
 232                 }
 233         }
 234
 235         switch (sdata->vif.type) {
 236         case IEEE80211_IF_TYPE_WDS:
 237                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 238                         return -ENOLINK;
 239                 break;
 240         case IEEE80211_IF_TYPE_VLAN:
 241                 if (!sdata->bss)
 242                         return -ENOLINK;
 243                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 244                 break;
 245         case IEEE80211_IF_TYPE_AP:
 246                 sdata->bss = &sdata->u.ap;
 247                 break;
 248         case IEEE80211_IF_TYPE_STA:
 249         case IEEE80211_IF_TYPE_MNTR:
 250         case IEEE80211_IF_TYPE_IBSS:
 251         case IEEE80211_IF_TYPE_MESH_POINT:
 252                 /* no special treatment */
 253                 break;
 254         case IEEE80211_IF_TYPE_INVALID:
 255                 /* cannot happen */
 256                 WARN_ON(1);
 257                 break;
 258         }
 259
 260         if (local->open_count == 0) {
 261                 res = 0;
 262                 if (local->ops->start)
 263                         res = local->ops->start(local_to_hw(local));
 264                 if (res)
 265                         goto err_del_bss;
 266                 need_hw_reconfig = 1;
 267                 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
 268         }
 269
 270         switch (sdata->vif.type) {
 271         case IEEE80211_IF_TYPE_VLAN:
 272                 /* no need to tell driver */
 273                 break;
 274         case IEEE80211_IF_TYPE_MNTR:
 275                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 276                         local->cooked_mntrs++;
 277                         break;
 278                 }
 279
 280                 /* must be before the call to ieee80211_configure_filter */
 281                 local->monitors++;
 282                 if (local->monitors == 1)
 283                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 284
 285                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 286                         local->fif_fcsfail++;
 287                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 288                         local->fif_plcpfail++;
 289                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 290                         local->fif_control++;
 291                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 292                         local->fif_other_bss++;
 293
 294                 netif_addr_lock_bh(local->mdev);
 295                 ieee80211_configure_filter(local);
 296                 netif_addr_unlock_bh(local->mdev);
 297                 break;
 298         case IEEE80211_IF_TYPE_STA:
 299         case IEEE80211_IF_TYPE_IBSS:
 300                 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
 301                 /* fall through */
 302         default:
 303                 conf.vif = &sdata->vif;
 304                 conf.type = sdata->vif.type;
 305                 conf.mac_addr = dev->dev_addr;
 306                 res = local->ops->add_interface(local_to_hw(local), &conf);
 307                 if (res)
 308                         goto err_stop;
 309
 310                 if (ieee80211_vif_is_mesh(&sdata->vif))
 311                         ieee80211_start_mesh(sdata->dev);
 312                 changed |= ieee80211_reset_erp_info(dev);
 313                 ieee80211_bss_info_change_notify(sdata, changed);
 314                 ieee80211_enable_keys(sdata);
 315
 316                 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
 317                     !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
 318                         netif_carrier_off(dev);
 319                 else
 320                         netif_carrier_on(dev);
 321         }
 322
 323         if (sdata->vif.type == IEEE80211_IF_TYPE_WDS) {
 324                 /* Create STA entry for the WDS peer */
 325                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 326                                      GFP_KERNEL);
 327                 if (!sta) {
 328                         res = -ENOMEM;
 329                         goto err_del_interface;
 330                 }
 331
 332                 /* no locking required since STA is not live yet */
 333                 sta->flags |= WLAN_STA_AUTHORIZED;
 334
 335                 res = sta_info_insert(sta);
 336                 if (res) {
 337                         /* STA has been freed */
 338                         goto err_del_interface;
 339                 }
 340         }
 341
 342         if (local->open_count == 0) {
 343                 res = dev_open(local->mdev);
 344                 WARN_ON(res);
 345                 if (res)
 346                         goto err_del_interface;
 347                 tasklet_enable(&local->tx_pending_tasklet);
 348                 tasklet_enable(&local->tasklet);
 349         }
 350
 351         /*
 352          * set_multicast_list will be invoked by the networking core
 353          * which will check whether any increments here were done in
 354          * error and sync them down to the hardware as filter flags.
 355          */
 356         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 357                 atomic_inc(&local->iff_allmultis);
 358
 359         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 360                 atomic_inc(&local->iff_promiscs);
 361
 362         local->open_count++;
 363         if (need_hw_reconfig)
 364                 ieee80211_hw_config(local);
 365
 366         /*
 367          * ieee80211_sta_work is disabled while network interface
 368          * is down. Therefore, some configuration changes may not
 369          * yet be effective. Trigger execution of ieee80211_sta_work
 370          * to fix this.
 371          */
 372         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
 373             sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
 374                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 375                 queue_work(local->hw.workqueue, &ifsta->work);
 376         }
 377
 378         netif_tx_start_all_queues(dev);
 379
 380         return 0;
 381  err_del_interface:
 382         local->ops->remove_interface(local_to_hw(local), &conf);
 383  err_stop:
 384         if (!local->open_count && local->ops->stop)
 385                 local->ops->stop(local_to_hw(local));
 386  err_del_bss:
 387         sdata->bss = NULL;
 388         if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN)
 389                 list_del(&sdata->u.vlan.list);
 390         return res;
 391 }
 392
 393 static int ieee80211_stop(struct net_device *dev)
 394 {
 395         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 396         struct ieee80211_local *local = sdata->local;
 397         struct ieee80211_if_init_conf conf;
 398         struct sta_info *sta;
 399
 400         /*
 401          * Stop TX on this interface first.
 402          */
 403         netif_tx_stop_all_queues(dev);
 404
 405         /*
 406          * Now delete all active aggregation sessions.
 407          */
 408         rcu_read_lock();
 409
 410         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 411                 if (sta->sdata == sdata)
 412                         ieee80211_sta_tear_down_BA_sessions(dev, sta->addr);
 413         }
 414
 415         rcu_read_unlock();
 416
 417         /*
 418          * Remove all stations associated with this interface.
 419          *
 420          * This must be done before calling ops->remove_interface()
 421          * because otherwise we can later invoke ops->sta_notify()
 422          * whenever the STAs are removed, and that invalidates driver
 423          * assumptions about always getting a vif pointer that is valid
 424          * (because if we remove a STA after ops->remove_interface()
 425          * the driver will have removed the vif info already!)
 426          *
 427          * We could relax this and only unlink the stations from the
 428          * hash table and list but keep them on a per-sdata list that
 429          * will be inserted back again when the interface is brought
 430          * up again, but I don't currently see a use case for that,
 431          * except with WDS which gets a STA entry created when it is
 432          * brought up.
 433          */
 434         sta_info_flush(local, sdata);
 435
 436         /*
 437          * Don't count this interface for promisc/allmulti while it
 438          * is down. dev_mc_unsync() will invoke set_multicast_list
 439          * on the master interface which will sync these down to the
 440          * hardware as filter flags.
 441          */
 442         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 443                 atomic_dec(&local->iff_allmultis);
 444
 445         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 446                 atomic_dec(&local->iff_promiscs);
 447
 448         dev_mc_unsync(local->mdev, dev);
 449
 450         /* APs need special treatment */
 451         if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
 452                 struct ieee80211_sub_if_data *vlan, *tmp;
 453                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 454
 455                 /* remove beacon */
 456                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 457                 synchronize_rcu();
 458                 kfree(old_beacon);
 459
 460                 /* down all dependent devices, that is VLANs */
 461                 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
 462                                          u.vlan.list)
 463                         dev_close(vlan->dev);
 464                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 465         }
 466
 467         local->open_count--;
 468
 469         switch (sdata->vif.type) {
 470         case IEEE80211_IF_TYPE_VLAN:
 471                 list_del(&sdata->u.vlan.list);
 472                 /* no need to tell driver */
 473                 break;
 474         case IEEE80211_IF_TYPE_MNTR:
 475                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 476                         local->cooked_mntrs--;
 477                         break;
 478                 }
 479
 480                 local->monitors--;
 481                 if (local->monitors == 0)
 482                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
 483
 484                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 485                         local->fif_fcsfail--;
 486                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 487                         local->fif_plcpfail--;
 488                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 489                         local->fif_control--;
 490                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 491                         local->fif_other_bss--;
 492
 493                 netif_addr_lock_bh(local->mdev);
 494                 ieee80211_configure_filter(local);
 495                 netif_addr_unlock_bh(local->mdev);
 496                 break;
 497         case IEEE80211_IF_TYPE_MESH_POINT:
 498         case IEEE80211_IF_TYPE_STA:
 499         case IEEE80211_IF_TYPE_IBSS:
 500                 sdata->u.sta.state = IEEE80211_DISABLED;
 501                 memset(sdata->u.sta.bssid, 0, ETH_ALEN);
 502                 del_timer_sync(&sdata->u.sta.timer);
 503                 /*
 504                  * When we get here, the interface is marked down.
 505                  * Call synchronize_rcu() to wait for the RX path
 506                  * should it be using the interface and enqueuing
 507                  * frames at this very time on another CPU.
 508                  */
 509                 synchronize_rcu();
 510                 skb_queue_purge(&sdata->u.sta.skb_queue);
 511
 512                 if (local->scan_dev == sdata->dev) {
 513                         if (!local->ops->hw_scan) {
 514                                 local->sta_sw_scanning = 0;
 515                                 cancel_delayed_work(&local->scan_work);
 516                         } else
 517                                 local->sta_hw_scanning = 0;
 518                 }
 519
 520                 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
 521                 kfree(sdata->u.sta.extra_ie);
 522                 sdata->u.sta.extra_ie = NULL;
 523                 sdata->u.sta.extra_ie_len = 0;
 524                 /* fall through */
 525         default:
 526                 conf.vif = &sdata->vif;
 527                 conf.type = sdata->vif.type;
 528                 conf.mac_addr = dev->dev_addr;
 529                 /* disable all keys for as long as this netdev is down */
 530                 ieee80211_disable_keys(sdata);
 531                 local->ops->remove_interface(local_to_hw(local), &conf);
 532         }
 533
 534         sdata->bss = NULL;
 535
 536         if (local->open_count == 0) {
 537                 if (netif_running(local->mdev))
 538                         dev_close(local->mdev);
 539
 540                 if (local->ops->stop)
 541                         local->ops->stop(local_to_hw(local));
 542
 543                 ieee80211_led_radio(local, 0);
 544
 545                 flush_workqueue(local->hw.workqueue);
 546
 547                 tasklet_disable(&local->tx_pending_tasklet);
 548                 tasklet_disable(&local->tasklet);
 549         }
 550
 551         return 0;
 552 }
 553
 554 int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid)
 555 {
 556         struct ieee80211_local *local = hw_to_local(hw);
 557         struct sta_info *sta;
 558         struct ieee80211_sub_if_data *sdata;
 559         u16 start_seq_num = 0;
 560         u8 *state;
 561         int ret;
 562         DECLARE_MAC_BUF(mac);
 563
 564         if (tid >= STA_TID_NUM)
 565                 return -EINVAL;
 566
 567 #ifdef CONFIG_MAC80211_HT_DEBUG
 568         printk(KERN_DEBUG "Open BA session requested for %s tid %u\n",
 569                                 print_mac(mac, ra), tid);
 570 #endif /* CONFIG_MAC80211_HT_DEBUG */
 571
 572         rcu_read_lock();
 573
 574         sta = sta_info_get(local, ra);
 575         if (!sta) {
 576 #ifdef CONFIG_MAC80211_HT_DEBUG
 577                 printk(KERN_DEBUG "Could not find the station\n");
 578 #endif
 579                 ret = -ENOENT;
 580                 goto exit;
 581         }
 582
 583         spin_lock_bh(&sta->lock);
 584
 585         /* we have tried too many times, receiver does not want A-MPDU */
 586         if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
 587                 ret = -EBUSY;
 588                 goto err_unlock_sta;
 589         }
 590
 591         state = &sta->ampdu_mlme.tid_state_tx[tid];
 592         /* check if the TID is not in aggregation flow already */
 593         if (*state != HT_AGG_STATE_IDLE) {
 594 #ifdef CONFIG_MAC80211_HT_DEBUG
 595                 printk(KERN_DEBUG "BA request denied - session is not "
 596                                  "idle on tid %u\n", tid);
 597 #endif /* CONFIG_MAC80211_HT_DEBUG */
 598                 ret = -EAGAIN;
 599                 goto err_unlock_sta;
 600         }
 601
 602         /* prepare A-MPDU MLME for Tx aggregation */
 603         sta->ampdu_mlme.tid_tx[tid] =
 604                         kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
 605         if (!sta->ampdu_mlme.tid_tx[tid]) {
 606 #ifdef CONFIG_MAC80211_HT_DEBUG
 607                 if (net_ratelimit())
 608                         printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
 609                                         tid);
 610 #endif
 611                 ret = -ENOMEM;
 612                 goto err_unlock_sta;
 613         }
 614         /* Tx timer */
 615         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function =
 616                         sta_addba_resp_timer_expired;
 617         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data =
 618                         (unsigned long)&sta->timer_to_tid[tid];
 619         init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
 620
 621         /* create a new queue for this aggregation */
 622         ret = ieee80211_ht_agg_queue_add(local, sta, tid);
 623
 624         /* case no queue is available to aggregation
 625          * don't switch to aggregation */
 626         if (ret) {
 627 #ifdef CONFIG_MAC80211_HT_DEBUG
 628                 printk(KERN_DEBUG "BA request denied - queue unavailable for"
 629                                         " tid %d\n", tid);
 630 #endif /* CONFIG_MAC80211_HT_DEBUG */
 631                 goto err_unlock_queue;
 632         }
 633         sdata = sta->sdata;
 634
 635         /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
 636          * call back right away, it must see that the flow has begun */
 637         *state |= HT_ADDBA_REQUESTED_MSK;
 638
 639         if (local->ops->ampdu_action)
 640                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
 641                                                 ra, tid, &start_seq_num);
 642
 643         if (ret) {
 644                 /* No need to requeue the packets in the agg queue, since we
 645                  * held the tx lock: no packet could be enqueued to the newly
 646                  * allocated queue */
 647                 ieee80211_ht_agg_queue_remove(local, sta, tid, 0);
 648 #ifdef CONFIG_MAC80211_HT_DEBUG
 649                 printk(KERN_DEBUG "BA request denied - HW unavailable for"
 650                                         " tid %d\n", tid);
 651 #endif /* CONFIG_MAC80211_HT_DEBUG */
 652                 *state = HT_AGG_STATE_IDLE;
 653                 goto err_unlock_queue;
 654         }
 655
 656         /* Will put all the packets in the new SW queue */
 657         ieee80211_requeue(local, ieee802_1d_to_ac[tid]);
 658         spin_unlock_bh(&sta->lock);
 659
 660         /* send an addBA request */
 661         sta->ampdu_mlme.dialog_token_allocator++;
 662         sta->ampdu_mlme.tid_tx[tid]->dialog_token =
 663                         sta->ampdu_mlme.dialog_token_allocator;
 664         sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
 665
 666
 667         ieee80211_send_addba_request(sta->sdata->dev, ra, tid,
 668                          sta->ampdu_mlme.tid_tx[tid]->dialog_token,
 669                          sta->ampdu_mlme.tid_tx[tid]->ssn,
 670                          0x40, 5000);
 671         /* activate the timer for the recipient's addBA response */
 672         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
 673                                 jiffies + ADDBA_RESP_INTERVAL;
 674         add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
 675 #ifdef CONFIG_MAC80211_HT_DEBUG
 676         printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
 677 #endif
 678         goto exit;
 679
 680 err_unlock_queue:
 681         kfree(sta->ampdu_mlme.tid_tx[tid]);
 682         sta->ampdu_mlme.tid_tx[tid] = NULL;
 683         ret = -EBUSY;
 684 err_unlock_sta:
 685         spin_unlock_bh(&sta->lock);
 686 exit:
 687         rcu_read_unlock();
 688         return ret;
 689 }
 690 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
 691
 692 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
 693                                  u8 *ra, u16 tid,
 694                                  enum ieee80211_back_parties initiator)
 695 {
 696         struct ieee80211_local *local = hw_to_local(hw);
 697         struct sta_info *sta;
 698         u8 *state;
 699         int ret = 0;
 700         DECLARE_MAC_BUF(mac);
 701
 702         if (tid >= STA_TID_NUM)
 703                 return -EINVAL;
 704
 705         rcu_read_lock();
 706         sta = sta_info_get(local, ra);
 707         if (!sta) {
 708                 rcu_read_unlock();
 709                 return -ENOENT;
 710         }
 711
 712         /* check if the TID is in aggregation */
 713         state = &sta->ampdu_mlme.tid_state_tx[tid];
 714         spin_lock_bh(&sta->lock);
 715
 716         if (*state != HT_AGG_STATE_OPERATIONAL) {
 717                 ret = -ENOENT;
 718                 goto stop_BA_exit;
 719         }
 720
 721 #ifdef CONFIG_MAC80211_HT_DEBUG
 722         printk(KERN_DEBUG "Tx BA session stop requested for %s tid %u\n",
 723                                 print_mac(mac, ra), tid);
 724 #endif /* CONFIG_MAC80211_HT_DEBUG */
 725
 726         ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]);
 727
 728         *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
 729                 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
 730
 731         if (local->ops->ampdu_action)
 732                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP,
 733                                                 ra, tid, NULL);
 734
 735         /* case HW denied going back to legacy */
 736         if (ret) {
 737                 WARN_ON(ret != -EBUSY);
 738                 *state = HT_AGG_STATE_OPERATIONAL;
 739                 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
 740                 goto stop_BA_exit;
 741         }
 742
 743 stop_BA_exit:
 744         spin_unlock_bh(&sta->lock);
 745         rcu_read_unlock();
 746         return ret;
 747 }
 748 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
 749
 750 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
 751 {
 752         struct ieee80211_local *local = hw_to_local(hw);
 753         struct sta_info *sta;
 754         u8 *state;
 755         DECLARE_MAC_BUF(mac);
 756
 757         if (tid >= STA_TID_NUM) {
 758 #ifdef CONFIG_MAC80211_HT_DEBUG
 759                 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
 760                                 tid, STA_TID_NUM);
 761 #endif
 762                 return;
 763         }
 764
 765         rcu_read_lock();
 766         sta = sta_info_get(local, ra);
 767         if (!sta) {
 768                 rcu_read_unlock();
 769 #ifdef CONFIG_MAC80211_HT_DEBUG
 770                 printk(KERN_DEBUG "Could not find station: %s\n",
 771                                 print_mac(mac, ra));
 772 #endif
 773                 return;
 774         }
 775
 776         state = &sta->ampdu_mlme.tid_state_tx[tid];
 777         spin_lock_bh(&sta->lock);
 778
 779         if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
 780 #ifdef CONFIG_MAC80211_HT_DEBUG
 781                 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
 782                                 *state);
 783 #endif
 784                 spin_unlock_bh(&sta->lock);
 785                 rcu_read_unlock();
 786                 return;
 787         }
 788
 789         WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK);
 790
 791         *state |= HT_ADDBA_DRV_READY_MSK;
 792
 793         if (*state == HT_AGG_STATE_OPERATIONAL) {
 794 #ifdef CONFIG_MAC80211_HT_DEBUG
 795                 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
 796 #endif
 797                 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
 798         }
 799         spin_unlock_bh(&sta->lock);
 800         rcu_read_unlock();
 801 }
 802 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
 803
 804 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
 805 {
 806         struct ieee80211_local *local = hw_to_local(hw);
 807         struct sta_info *sta;
 808         u8 *state;
 809         int agg_queue;
 810         DECLARE_MAC_BUF(mac);
 811
 812         if (tid >= STA_TID_NUM) {
 813 #ifdef CONFIG_MAC80211_HT_DEBUG
 814                 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
 815                                 tid, STA_TID_NUM);
 816 #endif
 817                 return;
 818         }
 819
 820 #ifdef CONFIG_MAC80211_HT_DEBUG
 821         printk(KERN_DEBUG "Stopping Tx BA session for %s tid %d\n",
 822                                 print_mac(mac, ra), tid);
 823 #endif /* CONFIG_MAC80211_HT_DEBUG */
 824
 825         rcu_read_lock();
 826         sta = sta_info_get(local, ra);
 827         if (!sta) {
 828 #ifdef CONFIG_MAC80211_HT_DEBUG
 829                 printk(KERN_DEBUG "Could not find station: %s\n",
 830                                 print_mac(mac, ra));
 831 #endif
 832                 rcu_read_unlock();
 833                 return;
 834         }
 835         state = &sta->ampdu_mlme.tid_state_tx[tid];
 836
 837         /* NOTE: no need to use sta->lock in this state check, as
 838          * ieee80211_stop_tx_ba_session will let only one stop call to
 839          * pass through per sta/tid
 840          */
 841         if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
 842 #ifdef CONFIG_MAC80211_HT_DEBUG
 843                 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
 844 #endif
 845                 rcu_read_unlock();
 846                 return;
 847         }
 848
 849         if (*state & HT_AGG_STATE_INITIATOR_MSK)
 850                 ieee80211_send_delba(sta->sdata->dev, ra, tid,
 851                         WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
 852
 853         agg_queue = sta->tid_to_tx_q[tid];
 854
 855         ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
 856
 857         /* We just requeued the all the frames that were in the
 858          * removed queue, and since we might miss a softirq we do
 859          * netif_schedule_queue.  ieee80211_wake_queue is not used
 860          * here as this queue is not necessarily stopped
 861          */
 862         netif_schedule_queue(netdev_get_tx_queue(local->mdev, agg_queue));
 863         spin_lock_bh(&sta->lock);
 864         *state = HT_AGG_STATE_IDLE;
 865         sta->ampdu_mlme.addba_req_num[tid] = 0;
 866         kfree(sta->ampdu_mlme.tid_tx[tid]);
 867         sta->ampdu_mlme.tid_tx[tid] = NULL;
 868         spin_unlock_bh(&sta->lock);
 869
 870         rcu_read_unlock();
 871 }
 872 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
 873
 874 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
 875                                       const u8 *ra, u16 tid)
 876 {
 877         struct ieee80211_local *local = hw_to_local(hw);
 878         struct ieee80211_ra_tid *ra_tid;
 879         struct sk_buff *skb = dev_alloc_skb(0);
 880
 881         if (unlikely(!skb)) {
 882 #ifdef CONFIG_MAC80211_HT_DEBUG
 883                 if (net_ratelimit())
 884                         printk(KERN_WARNING "%s: Not enough memory, "
 885                                "dropping start BA session", skb->dev->name);
 886 #endif
 887                 return;
 888         }
 889         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 890         memcpy(&ra_tid->ra, ra, ETH_ALEN);
 891         ra_tid->tid = tid;
 892
 893         skb->pkt_type = IEEE80211_ADDBA_MSG;
 894         skb_queue_tail(&local->skb_queue, skb);
 895         tasklet_schedule(&local->tasklet);
 896 }
 897 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
 898
 899 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
 900                                      const u8 *ra, u16 tid)
 901 {
 902         struct ieee80211_local *local = hw_to_local(hw);
 903         struct ieee80211_ra_tid *ra_tid;
 904         struct sk_buff *skb = dev_alloc_skb(0);
 905
 906         if (unlikely(!skb)) {
 907 #ifdef CONFIG_MAC80211_HT_DEBUG
 908                 if (net_ratelimit())
 909                         printk(KERN_WARNING "%s: Not enough memory, "
 910                                "dropping stop BA session", skb->dev->name);
 911 #endif
 912                 return;
 913         }
 914         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 915         memcpy(&ra_tid->ra, ra, ETH_ALEN);
 916         ra_tid->tid = tid;
 917
 918         skb->pkt_type = IEEE80211_DELBA_MSG;
 919         skb_queue_tail(&local->skb_queue, skb);
 920         tasklet_schedule(&local->tasklet);
 921 }
 922 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
 923
 924 static void ieee80211_set_multicast_list(struct net_device *dev)
 925 {
 926         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 927         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 928         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 929
 930         allmulti = !!(dev->flags & IFF_ALLMULTI);
 931         promisc = !!(dev->flags & IFF_PROMISC);
 932         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 933         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 934
 935         if (allmulti != sdata_allmulti) {
 936                 if (dev->flags & IFF_ALLMULTI)
 937                         atomic_inc(&local->iff_allmultis);
 938                 else
 939                         atomic_dec(&local->iff_allmultis);
 940                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 941         }
 942
 943         if (promisc != sdata_promisc) {
 944                 if (dev->flags & IFF_PROMISC)
 945                         atomic_inc(&local->iff_promiscs);
 946                 else
 947                         atomic_dec(&local->iff_promiscs);
 948                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 949         }
 950
 951         dev_mc_sync(local->mdev, dev);
 952 }
 953
 954 static const struct header_ops ieee80211_header_ops = {
 955         .create         = eth_header,
 956         .parse          = header_parse_80211,
 957         .rebuild        = eth_rebuild_header,
 958         .cache          = eth_header_cache,
 959         .cache_update   = eth_header_cache_update,
 960 };
 961
 962 void ieee80211_if_setup(struct net_device *dev)
 963 {
 964         ether_setup(dev);
 965         dev->hard_start_xmit = ieee80211_subif_start_xmit;
 966         dev->wireless_handlers = &ieee80211_iw_handler_def;
 967         dev->set_multicast_list = ieee80211_set_multicast_list;
 968         dev->change_mtu = ieee80211_change_mtu;
 969         dev->open = ieee80211_open;
 970         dev->stop = ieee80211_stop;
 971         dev->destructor = free_netdev;
 972 }
 973
 974 /* everything else */
 975
 976 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
 977 {
 978         struct ieee80211_local *local = sdata->local;
 979         struct ieee80211_if_conf conf;
 980
 981         if (WARN_ON(!netif_running(sdata->dev)))
 982                 return 0;
 983
 984         if (!local->ops->config_interface)
 985                 return 0;
 986
 987         memset(&conf, 0, sizeof(conf));
 988         conf.changed = changed;
 989
 990         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
 991             sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
 992                 conf.bssid = sdata->u.sta.bssid;
 993                 conf.ssid = sdata->u.sta.ssid;
 994                 conf.ssid_len = sdata->u.sta.ssid_len;
 995         } else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
 996                 conf.bssid = sdata->dev->dev_addr;
 997                 conf.ssid = sdata->u.ap.ssid;
 998                 conf.ssid_len = sdata->u.ap.ssid_len;
 999         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
1000                 u8 zero[ETH_ALEN] = { 0 };
1001                 conf.bssid = zero;
1002                 conf.ssid = zero;
1003                 conf.ssid_len = 0;
1004         } else {
1005                 WARN_ON(1);
1006                 return -EINVAL;
1007         }
1008
1009         if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
1010                 return -EINVAL;
1011
1012         if (WARN_ON(!conf.ssid && (changed & IEEE80211_IFCC_SSID)))
1013                 return -EINVAL;
1014
1015         return local->ops->config_interface(local_to_hw(local),
1016                                             &sdata->vif, &conf);
1017 }
1018
1019 int ieee80211_hw_config(struct ieee80211_local *local)
1020 {
1021         struct ieee80211_channel *chan;
1022         int ret = 0;
1023
1024         if (local->sta_sw_scanning)
1025                 chan = local->scan_channel;
1026         else
1027                 chan = local->oper_channel;
1028
1029         local->hw.conf.channel = chan;
1030
1031         if (!local->hw.conf.power_level)
1032                 local->hw.conf.power_level = chan->max_power;
1033         else
1034                 local->hw.conf.power_level = min(chan->max_power,
1035                                                local->hw.conf.power_level);
1036
1037         local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
1038
1039 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1040         printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
1041                wiphy_name(local->hw.wiphy), chan->center_freq);
1042 #endif
1043
1044         if (local->open_count)
1045                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
1046
1047         return ret;
1048 }
1049
1050 /**
1051  * ieee80211_handle_ht should be used only after legacy configuration
1052  * has been determined namely band, as ht configuration depends upon
1053  * the hardware's HT abilities for a _specific_ band.
1054  */
1055 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
1056                            struct ieee80211_ht_info *req_ht_cap,
1057                            struct ieee80211_ht_bss_info *req_bss_cap)
1058 {
1059         struct ieee80211_conf *conf = &local->hw.conf;
1060         struct ieee80211_supported_band *sband;
1061         struct ieee80211_ht_info ht_conf;
1062         struct ieee80211_ht_bss_info ht_bss_conf;
1063         u32 changed = 0;
1064         int i;
1065         u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS;
1066         u8 tx_mcs_set_cap;
1067
1068         sband = local->hw.wiphy->bands[conf->channel->band];
1069
1070         memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
1071         memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
1072
1073         /* HT is not supported */
1074         if (!sband->ht_info.ht_supported) {
1075                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1076                 goto out;
1077         }
1078
1079         /* disable HT */
1080         if (!enable_ht) {
1081                 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
1082                         changed |= BSS_CHANGED_HT;
1083                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1084                 conf->ht_conf.ht_supported = 0;
1085                 goto out;
1086         }
1087
1088
1089         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
1090                 changed |= BSS_CHANGED_HT;
1091
1092         conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
1093         ht_conf.ht_supported = 1;
1094
1095         ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
1096         ht_conf.cap &= ~(IEEE80211_HT_CAP_MIMO_PS);
1097         ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_MIMO_PS;
1098         ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
1099         ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
1100         ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
1101
1102         ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
1103         ht_conf.ampdu_density = req_ht_cap->ampdu_density;
1104
1105         /* Bits 96-100 */
1106         tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12];
1107
1108         /* configure suppoerted Tx MCS according to requested MCS
1109          * (based in most cases on Rx capabilities of peer) and self
1110          * Tx MCS capabilities (as defined by low level driver HW
1111          * Tx capabilities) */
1112         if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED))
1113                 goto check_changed;
1114
1115         /* Counting from 0 therfore + 1 */
1116         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF)
1117                 max_tx_streams = ((tx_mcs_set_cap &
1118                                 IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1;
1119
1120         for (i = 0; i < max_tx_streams; i++)
1121                 ht_conf.supp_mcs_set[i] =
1122                         sband->ht_info.supp_mcs_set[i] &
1123                                         req_ht_cap->supp_mcs_set[i];
1124
1125         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM)
1126                 for (i = IEEE80211_SUPP_MCS_SET_UEQM;
1127                      i < IEEE80211_SUPP_MCS_SET_LEN; i++)
1128                         ht_conf.supp_mcs_set[i] =
1129                                 sband->ht_info.supp_mcs_set[i] &
1130                                         req_ht_cap->supp_mcs_set[i];
1131
1132 check_changed:
1133         /* if bss configuration changed store the new one */
1134         if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
1135             memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
1136                 changed |= BSS_CHANGED_HT;
1137                 memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
1138                 memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
1139         }
1140 out:
1141         return changed;
1142 }
1143
1144 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1145                                       u32 changed)
1146 {
1147         struct ieee80211_local *local = sdata->local;
1148
1149         if (!changed)
1150                 return;
1151
1152         if (local->ops->bss_info_changed)
1153                 local->ops->bss_info_changed(local_to_hw(local),
1154                                              &sdata->vif,
1155                                              &sdata->bss_conf,
1156                                              changed);
1157 }
1158
1159 u32 ieee80211_reset_erp_info(struct net_device *dev)
1160 {
1161         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1162
1163         sdata->bss_conf.use_cts_prot = 0;
1164         sdata->bss_conf.use_short_preamble = 0;
1165         return BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE;
1166 }
1167
1168 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
1169                                  struct sk_buff *skb)
1170 {
1171         struct ieee80211_local *local = hw_to_local(hw);
1172         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1173         int tmp;
1174
1175         skb->dev = local->mdev;
1176         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
1177         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
1178                        &local->skb_queue : &local->skb_queue_unreliable, skb);
1179         tmp = skb_queue_len(&local->skb_queue) +
1180                 skb_queue_len(&local->skb_queue_unreliable);
1181         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
1182                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1183                 dev_kfree_skb_irq(skb);
1184                 tmp--;
1185                 I802_DEBUG_INC(local->tx_status_drop);
1186         }
1187         tasklet_schedule(&local->tasklet);
1188 }
1189 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
1190
1191 static void ieee80211_tasklet_handler(unsigned long data)
1192 {
1193         struct ieee80211_local *local = (struct ieee80211_local *) data;
1194         struct sk_buff *skb;
1195         struct ieee80211_rx_status rx_status;
1196         struct ieee80211_ra_tid *ra_tid;
1197
1198         while ((skb = skb_dequeue(&local->skb_queue)) ||
1199                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1200                 switch (skb->pkt_type) {
1201                 case IEEE80211_RX_MSG:
1202                         /* status is in skb->cb */
1203                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
1204                         /* Clear skb->pkt_type in order to not confuse kernel
1205                          * netstack. */
1206                         skb->pkt_type = 0;
1207                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
1208                         break;
1209                 case IEEE80211_TX_STATUS_MSG:
1210                         skb->pkt_type = 0;
1211                         ieee80211_tx_status(local_to_hw(local), skb);
1212                         break;
1213                 case IEEE80211_DELBA_MSG:
1214                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1215                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
1216                                                 ra_tid->ra, ra_tid->tid);
1217                         dev_kfree_skb(skb);
1218                         break;
1219                 case IEEE80211_ADDBA_MSG:
1220                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1221                         ieee80211_start_tx_ba_cb(local_to_hw(local),
1222                                                  ra_tid->ra, ra_tid->tid);
1223                         dev_kfree_skb(skb);
1224                         break ;
1225                 default:
1226                         WARN_ON(1);
1227                         dev_kfree_skb(skb);
1228                         break;
1229                 }
1230         }
1231 }
1232
1233 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
1234  * make a prepared TX frame (one that has been given to hw) to look like brand
1235  * new IEEE 802.11 frame that is ready to go through TX processing again.
1236  */
1237 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
1238                                       struct ieee80211_key *key,
1239                                       struct sk_buff *skb)
1240 {
1241         int hdrlen, iv_len, mic_len;
1242
1243         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1244
1245         if (!key)
1246                 goto no_key;
1247
1248         switch (key->conf.alg) {
1249         case ALG_WEP:
1250                 iv_len = WEP_IV_LEN;
1251                 mic_len = WEP_ICV_LEN;
1252                 break;
1253         case ALG_TKIP:
1254                 iv_len = TKIP_IV_LEN;
1255                 mic_len = TKIP_ICV_LEN;
1256                 break;
1257         case ALG_CCMP:
1258                 iv_len = CCMP_HDR_LEN;
1259                 mic_len = CCMP_MIC_LEN;
1260                 break;
1261         default:
1262                 goto no_key;
1263         }
1264
1265         if (skb->len >= mic_len &&
1266             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
1267                 skb_trim(skb, skb->len - mic_len);
1268         if (skb->len >= iv_len && skb->len > hdrlen) {
1269                 memmove(skb->data + iv_len, skb->data, hdrlen);
1270                 skb_pull(skb, iv_len);
1271         }
1272
1273 no_key:
1274         {
1275                 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1276                 u16 fc = le16_to_cpu(hdr->frame_control);
1277                 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
1278                         fc &= ~IEEE80211_STYPE_QOS_DATA;
1279                         hdr->frame_control = cpu_to_le16(fc);
1280                         memmove(skb->data + 2, skb->data, hdrlen - 2);
1281                         skb_pull(skb, 2);
1282                 }
1283         }
1284 }
1285
1286 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
1287                                             struct sta_info *sta,
1288                                             struct sk_buff *skb)
1289 {
1290         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1291
1292         sta->tx_filtered_count++;
1293
1294         /*
1295          * Clear the TX filter mask for this STA when sending the next
1296          * packet. If the STA went to power save mode, this will happen
1297          * when it wakes up for the next time.
1298          */
1299         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
1300
1301         /*
1302          * This code races in the following way:
1303          *
1304          *  (1) STA sends frame indicating it will go to sleep and does so
1305          *  (2) hardware/firmware adds STA to filter list, passes frame up
1306          *  (3) hardware/firmware processes TX fifo and suppresses a frame
1307          *  (4) we get TX status before having processed the frame and
1308          *      knowing that the STA has gone to sleep.
1309          *
1310          * This is actually quite unlikely even when both those events are
1311          * processed from interrupts coming in quickly after one another or
1312          * even at the same time because we queue both TX status events and
1313          * RX frames to be processed by a tasklet and process them in the
1314          * same order that they were received or TX status last. Hence, there
1315          * is no race as long as the frame RX is processed before the next TX
1316          * status, which drivers can ensure, see below.
1317          *
1318          * Note that this can only happen if the hardware or firmware can
1319          * actually add STAs to the filter list, if this is done by the
1320          * driver in response to set_tim() (which will only reduce the race
1321          * this whole filtering tries to solve, not completely solve it)
1322          * this situation cannot happen.
1323          *
1324          * To completely solve this race drivers need to make sure that they
1325          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
1326          *      functions and
1327          *  (b) always process RX events before TX status events if ordering
1328          *      can be unknown, for example with different interrupt status
1329          *      bits.
1330          */
1331         if (test_sta_flags(sta, WLAN_STA_PS) &&
1332             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
1333                 ieee80211_remove_tx_extra(local, sta->key, skb);
1334                 skb_queue_tail(&sta->tx_filtered, skb);
1335                 return;
1336         }
1337
1338         if (!test_sta_flags(sta, WLAN_STA_PS) &&
1339             !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
1340                 /* Software retry the packet once */
1341                 info->flags |= IEEE80211_TX_CTL_REQUEUE;
1342                 ieee80211_remove_tx_extra(local, sta->key, skb);
1343                 dev_queue_xmit(skb);
1344                 return;
1345         }
1346
1347 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1348         if (net_ratelimit())
1349                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
1350                        "queue_len=%d PS=%d @%lu\n",
1351                        wiphy_name(local->hw.wiphy),
1352                        skb_queue_len(&sta->tx_filtered),
1353                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
1354 #endif
1355         dev_kfree_skb(skb);
1356 }
1357
1358 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1359 {
1360         struct sk_buff *skb2;
1361         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1362         struct ieee80211_local *local = hw_to_local(hw);
1363         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1364         u16 frag, type;
1365         __le16 fc;
1366         struct ieee80211_tx_status_rtap_hdr *rthdr;
1367         struct ieee80211_sub_if_data *sdata;
1368         struct net_device *prev_dev = NULL;
1369         struct sta_info *sta;
1370
1371         rcu_read_lock();
1372
1373         if (info->status.excessive_retries) {
1374                 sta = sta_info_get(local, hdr->addr1);
1375                 if (sta) {
1376                         if (test_sta_flags(sta, WLAN_STA_PS)) {
1377                                 /*
1378                                  * The STA is in power save mode, so assume
1379                                  * that this TX packet failed because of that.
1380                                  */
1381                                 ieee80211_handle_filtered_frame(local, sta, skb);
1382                                 rcu_read_unlock();
1383                                 return;
1384                         }
1385                 }
1386         }
1387
1388         fc = hdr->frame_control;
1389
1390         if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
1391             (ieee80211_is_data_qos(fc))) {
1392                 u16 tid, ssn;
1393                 u8 *qc;
1394                 sta = sta_info_get(local, hdr->addr1);
1395                 if (sta) {
1396                         qc = ieee80211_get_qos_ctl(hdr);
1397                         tid = qc[0] & 0xf;
1398                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
1399                                                 & IEEE80211_SCTL_SEQ);
1400                         ieee80211_send_bar(sta->sdata->dev, hdr->addr1,
1401                                            tid, ssn);
1402                 }
1403         }
1404
1405         if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
1406                 sta = sta_info_get(local, hdr->addr1);
1407                 if (sta) {
1408                         ieee80211_handle_filtered_frame(local, sta, skb);
1409                         rcu_read_unlock();
1410                         return;
1411                 }
1412         } else
1413                 rate_control_tx_status(local->mdev, skb);
1414
1415         rcu_read_unlock();
1416
1417         ieee80211_led_tx(local, 0);
1418
1419         /* SNMP counters
1420          * Fragments are passed to low-level drivers as separate skbs, so these
1421          * are actually fragments, not frames. Update frame counters only for
1422          * the first fragment of the frame. */
1423
1424         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
1425         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
1426
1427         if (info->flags & IEEE80211_TX_STAT_ACK) {
1428                 if (frag == 0) {
1429                         local->dot11TransmittedFrameCount++;
1430                         if (is_multicast_ether_addr(hdr->addr1))
1431                                 local->dot11MulticastTransmittedFrameCount++;
1432                         if (info->status.retry_count > 0)
1433                                 local->dot11RetryCount++;
1434                         if (info->status.retry_count > 1)
1435                                 local->dot11MultipleRetryCount++;
1436                 }
1437
1438                 /* This counter shall be incremented for an acknowledged MPDU
1439                  * with an individual address in the address 1 field or an MPDU
1440                  * with a multicast address in the address 1 field of type Data
1441                  * or Management. */
1442                 if (!is_multicast_ether_addr(hdr->addr1) ||
1443                     type == IEEE80211_FTYPE_DATA ||
1444                     type == IEEE80211_FTYPE_MGMT)
1445                         local->dot11TransmittedFragmentCount++;
1446         } else {
1447                 if (frag == 0)
1448                         local->dot11FailedCount++;
1449         }
1450
1451         /* this was a transmitted frame, but now we want to reuse it */
1452         skb_orphan(skb);
1453
1454         /*
1455          * This is a bit racy but we can avoid a lot of work
1456          * with this test...
1457          */
1458         if (!local->monitors && !local->cooked_mntrs) {
1459                 dev_kfree_skb(skb);
1460                 return;
1461         }
1462
1463         /* send frame to monitor interfaces now */
1464
1465         if (skb_headroom(skb) < sizeof(*rthdr)) {
1466                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
1467                 dev_kfree_skb(skb);
1468                 return;
1469         }
1470
1471         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
1472                                 skb_push(skb, sizeof(*rthdr));
1473
1474         memset(rthdr, 0, sizeof(*rthdr));
1475         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1476         rthdr->hdr.it_present =
1477                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
1478                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
1479
1480         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
1481             !is_multicast_ether_addr(hdr->addr1))
1482                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
1483
1484         if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
1485             (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
1486                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
1487         else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
1488                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
1489
1490         rthdr->data_retries = info->status.retry_count;
1491
1492         /* XXX: is this sufficient for BPF? */
1493         skb_set_mac_header(skb, 0);
1494         skb->ip_summed = CHECKSUM_UNNECESSARY;
1495         skb->pkt_type = PACKET_OTHERHOST;
1496         skb->protocol = htons(ETH_P_802_2);
1497         memset(skb->cb, 0, sizeof(skb->cb));
1498
1499         rcu_read_lock();
1500         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1501                 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) {
1502                         if (!netif_running(sdata->dev))
1503                                 continue;
1504
1505                         if (prev_dev) {
1506                                 skb2 = skb_clone(skb, GFP_ATOMIC);
1507                                 if (skb2) {
1508                                         skb2->dev = prev_dev;
1509                                         netif_rx(skb2);
1510                                 }
1511                         }
1512
1513                         prev_dev = sdata->dev;
1514                 }
1515         }
1516         if (prev_dev) {
1517                 skb->dev = prev_dev;
1518                 netif_rx(skb);
1519                 skb = NULL;
1520         }
1521         rcu_read_unlock();
1522         dev_kfree_skb(skb);
1523 }
1524 EXPORT_SYMBOL(ieee80211_tx_status);
1525
1526 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1527                                         const struct ieee80211_ops *ops)
1528 {
1529         struct ieee80211_local *local;
1530         int priv_size;
1531         struct wiphy *wiphy;
1532
1533         /* Ensure 32-byte alignment of our private data and hw private data.
1534          * We use the wiphy priv data for both our ieee80211_local and for
1535          * the driver's private data
1536          *
1537          * In memory it'll be like this:
1538          *
1539          * +-------------------------+
1540          * | struct wiphy           |
1541          * +-------------------------+
1542          * | struct ieee80211_local  |
1543          * +-------------------------+
1544          * | driver's private data   |
1545          * +-------------------------+
1546          *
1547          */
1548         priv_size = ((sizeof(struct ieee80211_local) +
1549                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
1550                     priv_data_len;
1551
1552         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
1553
1554         if (!wiphy)
1555                 return NULL;
1556
1557         wiphy->privid = mac80211_wiphy_privid;
1558
1559         local = wiphy_priv(wiphy);
1560         local->hw.wiphy = wiphy;
1561
1562         local->hw.priv = (char *)local +
1563                          ((sizeof(struct ieee80211_local) +
1564                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
1565
1566         BUG_ON(!ops->tx);
1567         BUG_ON(!ops->start);
1568         BUG_ON(!ops->stop);
1569         BUG_ON(!ops->config);
1570         BUG_ON(!ops->add_interface);
1571         BUG_ON(!ops->remove_interface);
1572         BUG_ON(!ops->configure_filter);
1573         local->ops = ops;
1574
1575         local->hw.queues = 1; /* default */
1576
1577         local->bridge_packets = 1;
1578
1579         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
1580         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1581         local->short_retry_limit = 7;
1582         local->long_retry_limit = 4;
1583         local->hw.conf.radio_enabled = 1;
1584
1585         INIT_LIST_HEAD(&local->interfaces);
1586
1587         spin_lock_init(&local->key_lock);
1588
1589         INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1590
1591         sta_info_init(local);
1592
1593         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1594                      (unsigned long)local);
1595         tasklet_disable(&local->tx_pending_tasklet);
1596
1597         tasklet_init(&local->tasklet,
1598                      ieee80211_tasklet_handler,
1599                      (unsigned long) local);
1600         tasklet_disable(&local->tasklet);
1601
1602         skb_queue_head_init(&local->skb_queue);
1603         skb_queue_head_init(&local->skb_queue_unreliable);
1604
1605         return local_to_hw(local);
1606 }
1607 EXPORT_SYMBOL(ieee80211_alloc_hw);
1608
1609 int ieee80211_register_hw(struct ieee80211_hw *hw)
1610 {
1611         struct ieee80211_local *local = hw_to_local(hw);
1612         const char *name;
1613         int result;
1614         enum ieee80211_band band;
1615         struct net_device *mdev;
1616         struct wireless_dev *mwdev;
1617
1618         /*
1619          * generic code guarantees at least one band,
1620          * set this very early because much code assumes
1621          * that hw.conf.channel is assigned
1622          */
1623         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1624                 struct ieee80211_supported_band *sband;
1625
1626                 sband = local->hw.wiphy->bands[band];
1627                 if (sband) {
1628                         /* init channel we're on */
1629                         local->hw.conf.channel =
1630                         local->oper_channel =
1631                         local->scan_channel = &sband->channels[0];
1632                         break;
1633                 }
1634         }
1635
1636         result = wiphy_register(local->hw.wiphy);
1637         if (result < 0)
1638                 return result;
1639
1640         /*
1641          * We use the number of queues for feature tests (QoS, HT) internally
1642          * so restrict them appropriately.
1643          */
1644         if (hw->queues > IEEE80211_MAX_QUEUES)
1645                 hw->queues = IEEE80211_MAX_QUEUES;
1646         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
1647                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
1648         if (hw->queues < 4)
1649                 hw->ampdu_queues = 0;
1650
1651         mdev = alloc_netdev_mq(sizeof(struct wireless_dev),
1652                                "wmaster%d", ether_setup,
1653                                ieee80211_num_queues(hw));
1654         if (!mdev)
1655                 goto fail_mdev_alloc;
1656
1657         mwdev = netdev_priv(mdev);
1658         mdev->ieee80211_ptr = mwdev;
1659         mwdev->wiphy = local->hw.wiphy;
1660
1661         local->mdev = mdev;
1662
1663         ieee80211_rx_bss_list_init(local);
1664
1665         mdev->hard_start_xmit = ieee80211_master_start_xmit;
1666         mdev->open = ieee80211_master_open;
1667         mdev->stop = ieee80211_master_stop;
1668         mdev->type = ARPHRD_IEEE80211;
1669         mdev->header_ops = &ieee80211_header_ops;
1670         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
1671
1672         name = wiphy_dev(local->hw.wiphy)->driver->name;
1673         local->hw.workqueue = create_freezeable_workqueue(name);
1674         if (!local->hw.workqueue) {
1675                 result = -ENOMEM;
1676                 goto fail_workqueue;
1677         }
1678
1679         /*
1680          * The hardware needs headroom for sending the frame,
1681          * and we need some headroom for passing the frame to monitor
1682          * interfaces, but never both at the same time.
1683          */
1684         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1685                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
1686
1687         debugfs_hw_add(local);
1688
1689         if (local->hw.conf.beacon_int < 10)
1690                 local->hw.conf.beacon_int = 100;
1691
1692         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
1693                                                   IEEE80211_HW_SIGNAL_DB |
1694                                                   IEEE80211_HW_SIGNAL_DBM) ?
1695                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1696         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
1697                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1698         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
1699                 local->wstats_flags |= IW_QUAL_DBM;
1700
1701         result = sta_info_start(local);
1702         if (result < 0)
1703                 goto fail_sta_info;
1704
1705         rtnl_lock();
1706         result = dev_alloc_name(local->mdev, local->mdev->name);
1707         if (result < 0)
1708                 goto fail_dev;
1709
1710         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1711         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1712
1713         result = register_netdevice(local->mdev);
1714         if (result < 0)
1715                 goto fail_dev;
1716
1717         result = ieee80211_init_rate_ctrl_alg(local,
1718                                               hw->rate_control_algorithm);
1719         if (result < 0) {
1720                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1721                        "algorithm\n", wiphy_name(local->hw.wiphy));
1722                 goto fail_rate;
1723         }
1724
1725         result = ieee80211_wep_init(local);
1726
1727         if (result < 0) {
1728                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
1729                        wiphy_name(local->hw.wiphy), result);
1730                 goto fail_wep;
1731         }
1732
1733         local->mdev->select_queue = ieee80211_select_queue;
1734
1735         /* add one default STA interface */
1736         result = ieee80211_if_add(local, "wlan%d", NULL,
1737                                   IEEE80211_IF_TYPE_STA, NULL);
1738         if (result)
1739                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1740                        wiphy_name(local->hw.wiphy));
1741
1742         rtnl_unlock();
1743
1744         ieee80211_led_init(local);
1745
1746         return 0;
1747
1748 fail_wep:
1749         rate_control_deinitialize(local);
1750 fail_rate:
1751         unregister_netdevice(local->mdev);
1752         local->mdev = NULL;
1753 fail_dev:
1754         rtnl_unlock();
1755         sta_info_stop(local);
1756 fail_sta_info:
1757         debugfs_hw_del(local);
1758         destroy_workqueue(local->hw.workqueue);
1759 fail_workqueue:
1760         if (local->mdev)
1761                 free_netdev(local->mdev);
1762 fail_mdev_alloc:
1763         wiphy_unregister(local->hw.wiphy);
1764         return result;
1765 }
1766 EXPORT_SYMBOL(ieee80211_register_hw);
1767
1768 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1769 {
1770         struct ieee80211_local *local = hw_to_local(hw);
1771
1772         tasklet_kill(&local->tx_pending_tasklet);
1773         tasklet_kill(&local->tasklet);
1774
1775         rtnl_lock();
1776
1777         /*
1778          * At this point, interface list manipulations are fine
1779          * because the driver cannot be handing us frames any
1780          * more and the tasklet is killed.
1781          */
1782
1783         /* First, we remove all virtual interfaces. */
1784         ieee80211_remove_interfaces(local);
1785
1786         /* then, finally, remove the master interface */
1787         unregister_netdevice(local->mdev);
1788
1789         rtnl_unlock();
1790
1791         ieee80211_rx_bss_list_deinit(local);
1792         ieee80211_clear_tx_pending(local);
1793         sta_info_stop(local);
1794         rate_control_deinitialize(local);
1795         debugfs_hw_del(local);
1796
1797         if (skb_queue_len(&local->skb_queue)
1798                         || skb_queue_len(&local->skb_queue_unreliable))
1799                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1800                        wiphy_name(local->hw.wiphy));
1801         skb_queue_purge(&local->skb_queue);
1802         skb_queue_purge(&local->skb_queue_unreliable);
1803
1804         destroy_workqueue(local->hw.workqueue);
1805         wiphy_unregister(local->hw.wiphy);
1806         ieee80211_wep_free(local);
1807         ieee80211_led_exit(local);
1808         free_netdev(local->mdev);
1809 }
1810 EXPORT_SYMBOL(ieee80211_unregister_hw);
1811
1812 void ieee80211_free_hw(struct ieee80211_hw *hw)
1813 {
1814         struct ieee80211_local *local = hw_to_local(hw);
1815
1816         wiphy_free(local->hw.wiphy);
1817 }
1818 EXPORT_SYMBOL(ieee80211_free_hw);
1819
1820 static int __init ieee80211_init(void)
1821 {
1822         struct sk_buff *skb;
1823         int ret;
1824
1825         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1826         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1827                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1828
1829         ret = rc80211_pid_init();
1830         if (ret)
1831                 return ret;
1832
1833         ieee80211_debugfs_netdev_init();
1834
1835         return 0;
1836 }
1837
1838 static void __exit ieee80211_exit(void)
1839 {
1840         rc80211_pid_exit();
1841
1842         /*
1843          * For key todo, it'll be empty by now but the work
1844          * might still be scheduled.
1845          */
1846         flush_scheduled_work();
1847
1848         if (mesh_allocated)
1849                 ieee80211s_stop();
1850
1851         ieee80211_debugfs_netdev_exit();
1852 }
1853
1854
1855 subsys_initcall(ieee80211_init);
1856 module_exit(ieee80211_exit);
1857
1858 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1859 MODULE_LICENSE("GPL");