git.oblomov.eu Git - linux-2.6/blob - 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_start_queue(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_start_queue(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_stop_queue(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 netdev_queue *txq;
 558         struct sta_info *sta;
 559         struct ieee80211_sub_if_data *sdata;
 560         u16 start_seq_num = 0;
 561         u8 *state;
 562         int ret;
 563         DECLARE_MAC_BUF(mac);
 564
 565         if (tid >= STA_TID_NUM)
 566                 return -EINVAL;
 567
 568 #ifdef CONFIG_MAC80211_HT_DEBUG
 569         printk(KERN_DEBUG "Open BA session requested for %s tid %u\n",
 570                                 print_mac(mac, ra), tid);
 571 #endif /* CONFIG_MAC80211_HT_DEBUG */
 572
 573         rcu_read_lock();
 574
 575         sta = sta_info_get(local, ra);
 576         if (!sta) {
 577 #ifdef CONFIG_MAC80211_HT_DEBUG
 578                 printk(KERN_DEBUG "Could not find the station\n");
 579 #endif
 580                 ret = -ENOENT;
 581                 goto exit;
 582         }
 583
 584         spin_lock_bh(&sta->lock);
 585
 586         /* we have tried too many times, receiver does not want A-MPDU */
 587         if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
 588                 ret = -EBUSY;
 589                 goto err_unlock_sta;
 590         }
 591
 592         state = &sta->ampdu_mlme.tid_state_tx[tid];
 593         /* check if the TID is not in aggregation flow already */
 594         if (*state != HT_AGG_STATE_IDLE) {
 595 #ifdef CONFIG_MAC80211_HT_DEBUG
 596                 printk(KERN_DEBUG "BA request denied - session is not "
 597                                  "idle on tid %u\n", tid);
 598 #endif /* CONFIG_MAC80211_HT_DEBUG */
 599                 ret = -EAGAIN;
 600                 goto err_unlock_sta;
 601         }
 602
 603         /* prepare A-MPDU MLME for Tx aggregation */
 604         sta->ampdu_mlme.tid_tx[tid] =
 605                         kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
 606         if (!sta->ampdu_mlme.tid_tx[tid]) {
 607 #ifdef CONFIG_MAC80211_HT_DEBUG
 608                 if (net_ratelimit())
 609                         printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
 610                                         tid);
 611 #endif
 612                 ret = -ENOMEM;
 613                 goto err_unlock_sta;
 614         }
 615         /* Tx timer */
 616         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function =
 617                         sta_addba_resp_timer_expired;
 618         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data =
 619                         (unsigned long)&sta->timer_to_tid[tid];
 620         init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
 621
 622         /* ensure that TX flow won't interrupt us
 623          * until the end of the call to requeue function */
 624         txq = &local->mdev->tx_queue;
 625         spin_lock_bh(&txq->lock);
 626
 627         /* create a new queue for this aggregation */
 628         ret = ieee80211_ht_agg_queue_add(local, sta, tid);
 629
 630         /* case no queue is available to aggregation
 631          * don't switch to aggregation */
 632         if (ret) {
 633 #ifdef CONFIG_MAC80211_HT_DEBUG
 634                 printk(KERN_DEBUG "BA request denied - queue unavailable for"
 635                                         " tid %d\n", tid);
 636 #endif /* CONFIG_MAC80211_HT_DEBUG */
 637                 goto err_unlock_queue;
 638         }
 639         sdata = sta->sdata;
 640
 641         /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
 642          * call back right away, it must see that the flow has begun */
 643         *state |= HT_ADDBA_REQUESTED_MSK;
 644
 645         if (local->ops->ampdu_action)
 646                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
 647                                                 ra, tid, &start_seq_num);
 648
 649         if (ret) {
 650                 /* No need to requeue the packets in the agg queue, since we
 651                  * held the tx lock: no packet could be enqueued to the newly
 652                  * allocated queue */
 653                  ieee80211_ht_agg_queue_remove(local, sta, tid, 0);
 654 #ifdef CONFIG_MAC80211_HT_DEBUG
 655                 printk(KERN_DEBUG "BA request denied - HW unavailable for"
 656                                         " tid %d\n", tid);
 657 #endif /* CONFIG_MAC80211_HT_DEBUG */
 658                 *state = HT_AGG_STATE_IDLE;
 659                 goto err_unlock_queue;
 660         }
 661
 662         /* Will put all the packets in the new SW queue */
 663         ieee80211_requeue(local, ieee802_1d_to_ac[tid]);
 664         spin_unlock_bh(&txq->lock);
 665         spin_unlock_bh(&sta->lock);
 666
 667         /* send an addBA request */
 668         sta->ampdu_mlme.dialog_token_allocator++;
 669         sta->ampdu_mlme.tid_tx[tid]->dialog_token =
 670                         sta->ampdu_mlme.dialog_token_allocator;
 671         sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
 672
 673
 674         ieee80211_send_addba_request(sta->sdata->dev, ra, tid,
 675                          sta->ampdu_mlme.tid_tx[tid]->dialog_token,
 676                          sta->ampdu_mlme.tid_tx[tid]->ssn,
 677                          0x40, 5000);
 678         /* activate the timer for the recipient's addBA response */
 679         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
 680                                 jiffies + ADDBA_RESP_INTERVAL;
 681         add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
 682 #ifdef CONFIG_MAC80211_HT_DEBUG
 683         printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
 684 #endif
 685         goto exit;
 686
 687 err_unlock_queue:
 688         kfree(sta->ampdu_mlme.tid_tx[tid]);
 689         sta->ampdu_mlme.tid_tx[tid] = NULL;
 690         spin_unlock_bh(&txq->lock);
 691         ret = -EBUSY;
 692 err_unlock_sta:
 693         spin_unlock_bh(&sta->lock);
 694 exit:
 695         rcu_read_unlock();
 696         return ret;
 697 }
 698 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
 699
 700 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
 701                                  u8 *ra, u16 tid,
 702                                  enum ieee80211_back_parties initiator)
 703 {
 704         struct ieee80211_local *local = hw_to_local(hw);
 705         struct sta_info *sta;
 706         u8 *state;
 707         int ret = 0;
 708         DECLARE_MAC_BUF(mac);
 709
 710         if (tid >= STA_TID_NUM)
 711                 return -EINVAL;
 712
 713         rcu_read_lock();
 714         sta = sta_info_get(local, ra);
 715         if (!sta) {
 716                 rcu_read_unlock();
 717                 return -ENOENT;
 718         }
 719
 720         /* check if the TID is in aggregation */
 721         state = &sta->ampdu_mlme.tid_state_tx[tid];
 722         spin_lock_bh(&sta->lock);
 723
 724         if (*state != HT_AGG_STATE_OPERATIONAL) {
 725                 ret = -ENOENT;
 726                 goto stop_BA_exit;
 727         }
 728
 729 #ifdef CONFIG_MAC80211_HT_DEBUG
 730         printk(KERN_DEBUG "Tx BA session stop requested for %s tid %u\n",
 731                                 print_mac(mac, ra), tid);
 732 #endif /* CONFIG_MAC80211_HT_DEBUG */
 733
 734         ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]);
 735
 736         *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
 737                 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
 738
 739         if (local->ops->ampdu_action)
 740                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP,
 741                                                 ra, tid, NULL);
 742
 743         /* case HW denied going back to legacy */
 744         if (ret) {
 745                 WARN_ON(ret != -EBUSY);
 746                 *state = HT_AGG_STATE_OPERATIONAL;
 747                 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
 748                 goto stop_BA_exit;
 749         }
 750
 751 stop_BA_exit:
 752         spin_unlock_bh(&sta->lock);
 753         rcu_read_unlock();
 754         return ret;
 755 }
 756 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
 757
 758 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
 759 {
 760         struct ieee80211_local *local = hw_to_local(hw);
 761         struct sta_info *sta;
 762         u8 *state;
 763         DECLARE_MAC_BUF(mac);
 764
 765         if (tid >= STA_TID_NUM) {
 766 #ifdef CONFIG_MAC80211_HT_DEBUG
 767                 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
 768                                 tid, STA_TID_NUM);
 769 #endif
 770                 return;
 771         }
 772
 773         rcu_read_lock();
 774         sta = sta_info_get(local, ra);
 775         if (!sta) {
 776                 rcu_read_unlock();
 777 #ifdef CONFIG_MAC80211_HT_DEBUG
 778                 printk(KERN_DEBUG "Could not find station: %s\n",
 779                                 print_mac(mac, ra));
 780 #endif
 781                 return;
 782         }
 783
 784         state = &sta->ampdu_mlme.tid_state_tx[tid];
 785         spin_lock_bh(&sta->lock);
 786
 787         if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
 788 #ifdef CONFIG_MAC80211_HT_DEBUG
 789                 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
 790                                 *state);
 791 #endif
 792                 spin_unlock_bh(&sta->lock);
 793                 rcu_read_unlock();
 794                 return;
 795         }
 796
 797         WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK);
 798
 799         *state |= HT_ADDBA_DRV_READY_MSK;
 800
 801         if (*state == HT_AGG_STATE_OPERATIONAL) {
 802 #ifdef CONFIG_MAC80211_HT_DEBUG
 803                 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
 804 #endif
 805                 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
 806         }
 807         spin_unlock_bh(&sta->lock);
 808         rcu_read_unlock();
 809 }
 810 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
 811
 812 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
 813 {
 814         struct ieee80211_local *local = hw_to_local(hw);
 815         struct netdev_queue *txq;
 816         struct sta_info *sta;
 817         u8 *state;
 818         int agg_queue;
 819         DECLARE_MAC_BUF(mac);
 820
 821         if (tid >= STA_TID_NUM) {
 822 #ifdef CONFIG_MAC80211_HT_DEBUG
 823                 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
 824                                 tid, STA_TID_NUM);
 825 #endif
 826                 return;
 827         }
 828
 829 #ifdef CONFIG_MAC80211_HT_DEBUG
 830         printk(KERN_DEBUG "Stopping Tx BA session for %s tid %d\n",
 831                                 print_mac(mac, ra), tid);
 832 #endif /* CONFIG_MAC80211_HT_DEBUG */
 833
 834         rcu_read_lock();
 835         sta = sta_info_get(local, ra);
 836         if (!sta) {
 837 #ifdef CONFIG_MAC80211_HT_DEBUG
 838                 printk(KERN_DEBUG "Could not find station: %s\n",
 839                                 print_mac(mac, ra));
 840 #endif
 841                 rcu_read_unlock();
 842                 return;
 843         }
 844         state = &sta->ampdu_mlme.tid_state_tx[tid];
 845
 846         /* NOTE: no need to use sta->lock in this state check, as
 847          * ieee80211_stop_tx_ba_session will let only
 848          * one stop call to pass through per sta/tid */
 849         if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
 850 #ifdef CONFIG_MAC80211_HT_DEBUG
 851                 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
 852 #endif
 853                 rcu_read_unlock();
 854                 return;
 855         }
 856
 857         if (*state & HT_AGG_STATE_INITIATOR_MSK)
 858                 ieee80211_send_delba(sta->sdata->dev, ra, tid,
 859                         WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
 860
 861         agg_queue = sta->tid_to_tx_q[tid];
 862
 863         /* avoid ordering issues: we are the only one that can modify
 864          * the content of the qdiscs */
 865         txq = &local->mdev->tx_queue;
 866         spin_lock_bh(&txq->lock);
 867         /* remove the queue for this aggregation */
 868         ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
 869         spin_unlock_bh(&txq->lock);
 870
 871         /* we just requeued the all the frames that were in the removed
 872          * queue, and since we might miss a softirq we do netif_schedule_queue.
 873          * ieee80211_wake_queue is not used here as this queue is not
 874          * necessarily stopped */
 875         netif_schedule_queue(txq);
 876         spin_lock_bh(&sta->lock);
 877         *state = HT_AGG_STATE_IDLE;
 878         sta->ampdu_mlme.addba_req_num[tid] = 0;
 879         kfree(sta->ampdu_mlme.tid_tx[tid]);
 880         sta->ampdu_mlme.tid_tx[tid] = NULL;
 881         spin_unlock_bh(&sta->lock);
 882
 883         rcu_read_unlock();
 884 }
 885 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
 886
 887 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
 888                                       const u8 *ra, u16 tid)
 889 {
 890         struct ieee80211_local *local = hw_to_local(hw);
 891         struct ieee80211_ra_tid *ra_tid;
 892         struct sk_buff *skb = dev_alloc_skb(0);
 893
 894         if (unlikely(!skb)) {
 895 #ifdef CONFIG_MAC80211_HT_DEBUG
 896                 if (net_ratelimit())
 897                         printk(KERN_WARNING "%s: Not enough memory, "
 898                                "dropping start BA session", skb->dev->name);
 899 #endif
 900                 return;
 901         }
 902         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 903         memcpy(&ra_tid->ra, ra, ETH_ALEN);
 904         ra_tid->tid = tid;
 905
 906         skb->pkt_type = IEEE80211_ADDBA_MSG;
 907         skb_queue_tail(&local->skb_queue, skb);
 908         tasklet_schedule(&local->tasklet);
 909 }
 910 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
 911
 912 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
 913                                      const u8 *ra, u16 tid)
 914 {
 915         struct ieee80211_local *local = hw_to_local(hw);
 916         struct ieee80211_ra_tid *ra_tid;
 917         struct sk_buff *skb = dev_alloc_skb(0);
 918
 919         if (unlikely(!skb)) {
 920 #ifdef CONFIG_MAC80211_HT_DEBUG
 921                 if (net_ratelimit())
 922                         printk(KERN_WARNING "%s: Not enough memory, "
 923                                "dropping stop BA session", skb->dev->name);
 924 #endif
 925                 return;
 926         }
 927         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 928         memcpy(&ra_tid->ra, ra, ETH_ALEN);
 929         ra_tid->tid = tid;
 930
 931         skb->pkt_type = IEEE80211_DELBA_MSG;
 932         skb_queue_tail(&local->skb_queue, skb);
 933         tasklet_schedule(&local->tasklet);
 934 }
 935 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
 936
 937 static void ieee80211_set_multicast_list(struct net_device *dev)
 938 {
 939         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 940         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 941         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 942
 943         allmulti = !!(dev->flags & IFF_ALLMULTI);
 944         promisc = !!(dev->flags & IFF_PROMISC);
 945         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 946         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 947
 948         if (allmulti != sdata_allmulti) {
 949                 if (dev->flags & IFF_ALLMULTI)
 950                         atomic_inc(&local->iff_allmultis);
 951                 else
 952                         atomic_dec(&local->iff_allmultis);
 953                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 954         }
 955
 956         if (promisc != sdata_promisc) {
 957                 if (dev->flags & IFF_PROMISC)
 958                         atomic_inc(&local->iff_promiscs);
 959                 else
 960                         atomic_dec(&local->iff_promiscs);
 961                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 962         }
 963
 964         dev_mc_sync(local->mdev, dev);
 965 }
 966
 967 static const struct header_ops ieee80211_header_ops = {
 968         .create         = eth_header,
 969         .parse          = header_parse_80211,
 970         .rebuild        = eth_rebuild_header,
 971         .cache          = eth_header_cache,
 972         .cache_update   = eth_header_cache_update,
 973 };
 974
 975 void ieee80211_if_setup(struct net_device *dev)
 976 {
 977         ether_setup(dev);
 978         dev->hard_start_xmit = ieee80211_subif_start_xmit;
 979         dev->wireless_handlers = &ieee80211_iw_handler_def;
 980         dev->set_multicast_list = ieee80211_set_multicast_list;
 981         dev->change_mtu = ieee80211_change_mtu;
 982         dev->open = ieee80211_open;
 983         dev->stop = ieee80211_stop;
 984         dev->destructor = free_netdev;
 985 }
 986
 987 /* everything else */
 988
 989 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
 990 {
 991         struct ieee80211_local *local = sdata->local;
 992         struct ieee80211_if_conf conf;
 993
 994         if (WARN_ON(!netif_running(sdata->dev)))
 995                 return 0;
 996
 997         if (!local->ops->config_interface)
 998                 return 0;
 999
1000         memset(&conf, 0, sizeof(conf));
1001         conf.changed = changed;
1002
1003         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
1004             sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
1005                 conf.bssid = sdata->u.sta.bssid;
1006                 conf.ssid = sdata->u.sta.ssid;
1007                 conf.ssid_len = sdata->u.sta.ssid_len;
1008         } else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
1009                 conf.bssid = sdata->dev->dev_addr;
1010                 conf.ssid = sdata->u.ap.ssid;
1011                 conf.ssid_len = sdata->u.ap.ssid_len;
1012         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
1013                 u8 zero[ETH_ALEN] = { 0 };
1014                 conf.bssid = zero;
1015                 conf.ssid = zero;
1016                 conf.ssid_len = 0;
1017         } else {
1018                 WARN_ON(1);
1019                 return -EINVAL;
1020         }
1021
1022         if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
1023                 return -EINVAL;
1024
1025         if (WARN_ON(!conf.ssid && (changed & IEEE80211_IFCC_SSID)))
1026                 return -EINVAL;
1027
1028         return local->ops->config_interface(local_to_hw(local),
1029                                             &sdata->vif, &conf);
1030 }
1031
1032 int ieee80211_hw_config(struct ieee80211_local *local)
1033 {
1034         struct ieee80211_channel *chan;
1035         int ret = 0;
1036
1037         if (local->sta_sw_scanning)
1038                 chan = local->scan_channel;
1039         else
1040                 chan = local->oper_channel;
1041
1042         local->hw.conf.channel = chan;
1043
1044         if (!local->hw.conf.power_level)
1045                 local->hw.conf.power_level = chan->max_power;
1046         else
1047                 local->hw.conf.power_level = min(chan->max_power,
1048                                                local->hw.conf.power_level);
1049
1050         local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
1051
1052 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1053         printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
1054                wiphy_name(local->hw.wiphy), chan->center_freq);
1055 #endif
1056
1057         if (local->open_count)
1058                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
1059
1060         return ret;
1061 }
1062
1063 /**
1064  * ieee80211_handle_ht should be used only after legacy configuration
1065  * has been determined namely band, as ht configuration depends upon
1066  * the hardware's HT abilities for a _specific_ band.
1067  */
1068 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
1069                            struct ieee80211_ht_info *req_ht_cap,
1070                            struct ieee80211_ht_bss_info *req_bss_cap)
1071 {
1072         struct ieee80211_conf *conf = &local->hw.conf;
1073         struct ieee80211_supported_band *sband;
1074         struct ieee80211_ht_info ht_conf;
1075         struct ieee80211_ht_bss_info ht_bss_conf;
1076         u32 changed = 0;
1077         int i;
1078         u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS;
1079         u8 tx_mcs_set_cap;
1080
1081         sband = local->hw.wiphy->bands[conf->channel->band];
1082
1083         memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
1084         memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
1085
1086         /* HT is not supported */
1087         if (!sband->ht_info.ht_supported) {
1088                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1089                 goto out;
1090         }
1091
1092         /* disable HT */
1093         if (!enable_ht) {
1094                 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
1095                         changed |= BSS_CHANGED_HT;
1096                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1097                 conf->ht_conf.ht_supported = 0;
1098                 goto out;
1099         }
1100
1101
1102         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
1103                 changed |= BSS_CHANGED_HT;
1104
1105         conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
1106         ht_conf.ht_supported = 1;
1107
1108         ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
1109         ht_conf.cap &= ~(IEEE80211_HT_CAP_MIMO_PS);
1110         ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_MIMO_PS;
1111         ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
1112         ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
1113         ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
1114
1115         ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
1116         ht_conf.ampdu_density = req_ht_cap->ampdu_density;
1117
1118         /* Bits 96-100 */
1119         tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12];
1120
1121         /* configure suppoerted Tx MCS according to requested MCS
1122          * (based in most cases on Rx capabilities of peer) and self
1123          * Tx MCS capabilities (as defined by low level driver HW
1124          * Tx capabilities) */
1125         if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED))
1126                 goto check_changed;
1127
1128         /* Counting from 0 therfore + 1 */
1129         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF)
1130                 max_tx_streams = ((tx_mcs_set_cap &
1131                                 IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1;
1132
1133         for (i = 0; i < max_tx_streams; i++)
1134                 ht_conf.supp_mcs_set[i] =
1135                         sband->ht_info.supp_mcs_set[i] &
1136                                         req_ht_cap->supp_mcs_set[i];
1137
1138         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM)
1139                 for (i = IEEE80211_SUPP_MCS_SET_UEQM;
1140                      i < IEEE80211_SUPP_MCS_SET_LEN; i++)
1141                         ht_conf.supp_mcs_set[i] =
1142                                 sband->ht_info.supp_mcs_set[i] &
1143                                         req_ht_cap->supp_mcs_set[i];
1144
1145 check_changed:
1146         /* if bss configuration changed store the new one */
1147         if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
1148             memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
1149                 changed |= BSS_CHANGED_HT;
1150                 memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
1151                 memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
1152         }
1153 out:
1154         return changed;
1155 }
1156
1157 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1158                                       u32 changed)
1159 {
1160         struct ieee80211_local *local = sdata->local;
1161
1162         if (!changed)
1163                 return;
1164
1165         if (local->ops->bss_info_changed)
1166                 local->ops->bss_info_changed(local_to_hw(local),
1167                                              &sdata->vif,
1168                                              &sdata->bss_conf,
1169                                              changed);
1170 }
1171
1172 u32 ieee80211_reset_erp_info(struct net_device *dev)
1173 {
1174         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1175
1176         sdata->bss_conf.use_cts_prot = 0;
1177         sdata->bss_conf.use_short_preamble = 0;
1178         return BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE;
1179 }
1180
1181 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
1182                                  struct sk_buff *skb)
1183 {
1184         struct ieee80211_local *local = hw_to_local(hw);
1185         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1186         int tmp;
1187
1188         skb->dev = local->mdev;
1189         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
1190         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
1191                        &local->skb_queue : &local->skb_queue_unreliable, skb);
1192         tmp = skb_queue_len(&local->skb_queue) +
1193                 skb_queue_len(&local->skb_queue_unreliable);
1194         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
1195                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1196                 dev_kfree_skb_irq(skb);
1197                 tmp--;
1198                 I802_DEBUG_INC(local->tx_status_drop);
1199         }
1200         tasklet_schedule(&local->tasklet);
1201 }
1202 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
1203
1204 static void ieee80211_tasklet_handler(unsigned long data)
1205 {
1206         struct ieee80211_local *local = (struct ieee80211_local *) data;
1207         struct sk_buff *skb;
1208         struct ieee80211_rx_status rx_status;
1209         struct ieee80211_ra_tid *ra_tid;
1210
1211         while ((skb = skb_dequeue(&local->skb_queue)) ||
1212                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1213                 switch (skb->pkt_type) {
1214                 case IEEE80211_RX_MSG:
1215                         /* status is in skb->cb */
1216                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
1217                         /* Clear skb->pkt_type in order to not confuse kernel
1218                          * netstack. */
1219                         skb->pkt_type = 0;
1220                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
1221                         break;
1222                 case IEEE80211_TX_STATUS_MSG:
1223                         skb->pkt_type = 0;
1224                         ieee80211_tx_status(local_to_hw(local), skb);
1225                         break;
1226                 case IEEE80211_DELBA_MSG:
1227                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1228                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
1229                                                 ra_tid->ra, ra_tid->tid);
1230                         dev_kfree_skb(skb);
1231                         break;
1232                 case IEEE80211_ADDBA_MSG:
1233                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1234                         ieee80211_start_tx_ba_cb(local_to_hw(local),
1235                                                  ra_tid->ra, ra_tid->tid);
1236                         dev_kfree_skb(skb);
1237                         break ;
1238                 default:
1239                         WARN_ON(1);
1240                         dev_kfree_skb(skb);
1241                         break;
1242                 }
1243         }
1244 }
1245
1246 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
1247  * make a prepared TX frame (one that has been given to hw) to look like brand
1248  * new IEEE 802.11 frame that is ready to go through TX processing again.
1249  * Also, tx_packet_data in cb is restored from tx_control. */
1250 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
1251                                       struct ieee80211_key *key,
1252                                       struct sk_buff *skb)
1253 {
1254         int hdrlen, iv_len, mic_len;
1255         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1256
1257         info->flags &=  IEEE80211_TX_CTL_REQ_TX_STATUS |
1258                         IEEE80211_TX_CTL_DO_NOT_ENCRYPT |
1259                         IEEE80211_TX_CTL_REQUEUE |
1260                         IEEE80211_TX_CTL_EAPOL_FRAME;
1261
1262         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1263
1264         if (!key)
1265                 goto no_key;
1266
1267         switch (key->conf.alg) {
1268         case ALG_WEP:
1269                 iv_len = WEP_IV_LEN;
1270                 mic_len = WEP_ICV_LEN;
1271                 break;
1272         case ALG_TKIP:
1273                 iv_len = TKIP_IV_LEN;
1274                 mic_len = TKIP_ICV_LEN;
1275                 break;
1276         case ALG_CCMP:
1277                 iv_len = CCMP_HDR_LEN;
1278                 mic_len = CCMP_MIC_LEN;
1279                 break;
1280         default:
1281                 goto no_key;
1282         }
1283
1284         if (skb->len >= mic_len &&
1285             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
1286                 skb_trim(skb, skb->len - mic_len);
1287         if (skb->len >= iv_len && skb->len > hdrlen) {
1288                 memmove(skb->data + iv_len, skb->data, hdrlen);
1289                 skb_pull(skb, iv_len);
1290         }
1291
1292 no_key:
1293         {
1294                 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1295                 u16 fc = le16_to_cpu(hdr->frame_control);
1296                 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
1297                         fc &= ~IEEE80211_STYPE_QOS_DATA;
1298                         hdr->frame_control = cpu_to_le16(fc);
1299                         memmove(skb->data + 2, skb->data, hdrlen - 2);
1300                         skb_pull(skb, 2);
1301                 }
1302         }
1303 }
1304
1305 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
1306                                             struct sta_info *sta,
1307                                             struct sk_buff *skb)
1308 {
1309         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1310
1311         sta->tx_filtered_count++;
1312
1313         /*
1314          * Clear the TX filter mask for this STA when sending the next
1315          * packet. If the STA went to power save mode, this will happen
1316          * when it wakes up for the next time.
1317          */
1318         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
1319
1320         /*
1321          * This code races in the following way:
1322          *
1323          *  (1) STA sends frame indicating it will go to sleep and does so
1324          *  (2) hardware/firmware adds STA to filter list, passes frame up
1325          *  (3) hardware/firmware processes TX fifo and suppresses a frame
1326          *  (4) we get TX status before having processed the frame and
1327          *      knowing that the STA has gone to sleep.
1328          *
1329          * This is actually quite unlikely even when both those events are
1330          * processed from interrupts coming in quickly after one another or
1331          * even at the same time because we queue both TX status events and
1332          * RX frames to be processed by a tasklet and process them in the
1333          * same order that they were received or TX status last. Hence, there
1334          * is no race as long as the frame RX is processed before the next TX
1335          * status, which drivers can ensure, see below.
1336          *
1337          * Note that this can only happen if the hardware or firmware can
1338          * actually add STAs to the filter list, if this is done by the
1339          * driver in response to set_tim() (which will only reduce the race
1340          * this whole filtering tries to solve, not completely solve it)
1341          * this situation cannot happen.
1342          *
1343          * To completely solve this race drivers need to make sure that they
1344          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
1345          *      functions and
1346          *  (b) always process RX events before TX status events if ordering
1347          *      can be unknown, for example with different interrupt status
1348          *      bits.
1349          */
1350         if (test_sta_flags(sta, WLAN_STA_PS) &&
1351             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
1352                 ieee80211_remove_tx_extra(local, sta->key, skb);
1353                 skb_queue_tail(&sta->tx_filtered, skb);
1354                 return;
1355         }
1356
1357         if (!test_sta_flags(sta, WLAN_STA_PS) &&
1358             !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
1359                 /* Software retry the packet once */
1360                 info->flags |= IEEE80211_TX_CTL_REQUEUE;
1361                 ieee80211_remove_tx_extra(local, sta->key, skb);
1362                 dev_queue_xmit(skb);
1363                 return;
1364         }
1365
1366 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1367         if (net_ratelimit())
1368                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
1369                        "queue_len=%d PS=%d @%lu\n",
1370                        wiphy_name(local->hw.wiphy),
1371                        skb_queue_len(&sta->tx_filtered),
1372                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
1373 #endif
1374         dev_kfree_skb(skb);
1375 }
1376
1377 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1378 {
1379         struct sk_buff *skb2;
1380         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1381         struct ieee80211_local *local = hw_to_local(hw);
1382         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1383         u16 frag, type;
1384         __le16 fc;
1385         struct ieee80211_tx_status_rtap_hdr *rthdr;
1386         struct ieee80211_sub_if_data *sdata;
1387         struct net_device *prev_dev = NULL;
1388         struct sta_info *sta;
1389
1390         rcu_read_lock();
1391
1392         if (info->status.excessive_retries) {
1393                 sta = sta_info_get(local, hdr->addr1);
1394                 if (sta) {
1395                         if (test_sta_flags(sta, WLAN_STA_PS)) {
1396                                 /*
1397                                  * The STA is in power save mode, so assume
1398                                  * that this TX packet failed because of that.
1399                                  */
1400                                 ieee80211_handle_filtered_frame(local, sta, skb);
1401                                 rcu_read_unlock();
1402                                 return;
1403                         }
1404                 }
1405         }
1406
1407         fc = hdr->frame_control;
1408
1409         if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
1410             (ieee80211_is_data_qos(fc))) {
1411                 u16 tid, ssn;
1412                 u8 *qc;
1413                 sta = sta_info_get(local, hdr->addr1);
1414                 if (sta) {
1415                         qc = ieee80211_get_qos_ctl(hdr);
1416                         tid = qc[0] & 0xf;
1417                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
1418                                                 & IEEE80211_SCTL_SEQ);
1419                         ieee80211_send_bar(sta->sdata->dev, hdr->addr1,
1420                                            tid, ssn);
1421                 }
1422         }
1423
1424         if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
1425                 sta = sta_info_get(local, hdr->addr1);
1426                 if (sta) {
1427                         ieee80211_handle_filtered_frame(local, sta, skb);
1428                         rcu_read_unlock();
1429                         return;
1430                 }
1431         } else
1432                 rate_control_tx_status(local->mdev, skb);
1433
1434         rcu_read_unlock();
1435
1436         ieee80211_led_tx(local, 0);
1437
1438         /* SNMP counters
1439          * Fragments are passed to low-level drivers as separate skbs, so these
1440          * are actually fragments, not frames. Update frame counters only for
1441          * the first fragment of the frame. */
1442
1443         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
1444         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
1445
1446         if (info->flags & IEEE80211_TX_STAT_ACK) {
1447                 if (frag == 0) {
1448                         local->dot11TransmittedFrameCount++;
1449                         if (is_multicast_ether_addr(hdr->addr1))
1450                                 local->dot11MulticastTransmittedFrameCount++;
1451                         if (info->status.retry_count > 0)
1452                                 local->dot11RetryCount++;
1453                         if (info->status.retry_count > 1)
1454                                 local->dot11MultipleRetryCount++;
1455                 }
1456
1457                 /* This counter shall be incremented for an acknowledged MPDU
1458                  * with an individual address in the address 1 field or an MPDU
1459                  * with a multicast address in the address 1 field of type Data
1460                  * or Management. */
1461                 if (!is_multicast_ether_addr(hdr->addr1) ||
1462                     type == IEEE80211_FTYPE_DATA ||
1463                     type == IEEE80211_FTYPE_MGMT)
1464                         local->dot11TransmittedFragmentCount++;
1465         } else {
1466                 if (frag == 0)
1467                         local->dot11FailedCount++;
1468         }
1469
1470         /* this was a transmitted frame, but now we want to reuse it */
1471         skb_orphan(skb);
1472
1473         /*
1474          * This is a bit racy but we can avoid a lot of work
1475          * with this test...
1476          */
1477         if (!local->monitors && !local->cooked_mntrs) {
1478                 dev_kfree_skb(skb);
1479                 return;
1480         }
1481
1482         /* send frame to monitor interfaces now */
1483
1484         if (skb_headroom(skb) < sizeof(*rthdr)) {
1485                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
1486                 dev_kfree_skb(skb);
1487                 return;
1488         }
1489
1490         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
1491                                 skb_push(skb, sizeof(*rthdr));
1492
1493         memset(rthdr, 0, sizeof(*rthdr));
1494         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1495         rthdr->hdr.it_present =
1496                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
1497                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
1498
1499         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
1500             !is_multicast_ether_addr(hdr->addr1))
1501                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
1502
1503         if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
1504             (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
1505                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
1506         else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
1507                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
1508
1509         rthdr->data_retries = info->status.retry_count;
1510
1511         /* XXX: is this sufficient for BPF? */
1512         skb_set_mac_header(skb, 0);
1513         skb->ip_summed = CHECKSUM_UNNECESSARY;
1514         skb->pkt_type = PACKET_OTHERHOST;
1515         skb->protocol = htons(ETH_P_802_2);
1516         memset(skb->cb, 0, sizeof(skb->cb));
1517
1518         rcu_read_lock();
1519         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1520                 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) {
1521                         if (!netif_running(sdata->dev))
1522                                 continue;
1523
1524                         if (prev_dev) {
1525                                 skb2 = skb_clone(skb, GFP_ATOMIC);
1526                                 if (skb2) {
1527                                         skb2->dev = prev_dev;
1528                                         netif_rx(skb2);
1529                                 }
1530                         }
1531
1532                         prev_dev = sdata->dev;
1533                 }
1534         }
1535         if (prev_dev) {
1536                 skb->dev = prev_dev;
1537                 netif_rx(skb);
1538                 skb = NULL;
1539         }
1540         rcu_read_unlock();
1541         dev_kfree_skb(skb);
1542 }
1543 EXPORT_SYMBOL(ieee80211_tx_status);
1544
1545 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1546                                         const struct ieee80211_ops *ops)
1547 {
1548         struct ieee80211_local *local;
1549         int priv_size;
1550         struct wiphy *wiphy;
1551
1552         /* Ensure 32-byte alignment of our private data and hw private data.
1553          * We use the wiphy priv data for both our ieee80211_local and for
1554          * the driver's private data
1555          *
1556          * In memory it'll be like this:
1557          *
1558          * +-------------------------+
1559          * | struct wiphy           |
1560          * +-------------------------+
1561          * | struct ieee80211_local  |
1562          * +-------------------------+
1563          * | driver's private data   |
1564          * +-------------------------+
1565          *
1566          */
1567         priv_size = ((sizeof(struct ieee80211_local) +
1568                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
1569                     priv_data_len;
1570
1571         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
1572
1573         if (!wiphy)
1574                 return NULL;
1575
1576         wiphy->privid = mac80211_wiphy_privid;
1577
1578         local = wiphy_priv(wiphy);
1579         local->hw.wiphy = wiphy;
1580
1581         local->hw.priv = (char *)local +
1582                          ((sizeof(struct ieee80211_local) +
1583                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
1584
1585         BUG_ON(!ops->tx);
1586         BUG_ON(!ops->start);
1587         BUG_ON(!ops->stop);
1588         BUG_ON(!ops->config);
1589         BUG_ON(!ops->add_interface);
1590         BUG_ON(!ops->remove_interface);
1591         BUG_ON(!ops->configure_filter);
1592         local->ops = ops;
1593
1594         local->hw.queues = 1; /* default */
1595
1596         local->bridge_packets = 1;
1597
1598         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
1599         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1600         local->short_retry_limit = 7;
1601         local->long_retry_limit = 4;
1602         local->hw.conf.radio_enabled = 1;
1603
1604         INIT_LIST_HEAD(&local->interfaces);
1605
1606         spin_lock_init(&local->key_lock);
1607
1608         INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1609
1610         sta_info_init(local);
1611
1612         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1613                      (unsigned long)local);
1614         tasklet_disable(&local->tx_pending_tasklet);
1615
1616         tasklet_init(&local->tasklet,
1617                      ieee80211_tasklet_handler,
1618                      (unsigned long) local);
1619         tasklet_disable(&local->tasklet);
1620
1621         skb_queue_head_init(&local->skb_queue);
1622         skb_queue_head_init(&local->skb_queue_unreliable);
1623
1624         return local_to_hw(local);
1625 }
1626 EXPORT_SYMBOL(ieee80211_alloc_hw);
1627
1628 int ieee80211_register_hw(struct ieee80211_hw *hw)
1629 {
1630         struct ieee80211_local *local = hw_to_local(hw);
1631         const char *name;
1632         int result;
1633         enum ieee80211_band band;
1634         struct net_device *mdev;
1635         struct wireless_dev *mwdev;
1636
1637         /*
1638          * generic code guarantees at least one band,
1639          * set this very early because much code assumes
1640          * that hw.conf.channel is assigned
1641          */
1642         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1643                 struct ieee80211_supported_band *sband;
1644
1645                 sband = local->hw.wiphy->bands[band];
1646                 if (sband) {
1647                         /* init channel we're on */
1648                         local->hw.conf.channel =
1649                         local->oper_channel =
1650                         local->scan_channel = &sband->channels[0];
1651                         break;
1652                 }
1653         }
1654
1655         result = wiphy_register(local->hw.wiphy);
1656         if (result < 0)
1657                 return result;
1658
1659         /*
1660          * We use the number of queues for feature tests (QoS, HT) internally
1661          * so restrict them appropriately.
1662          */
1663 #ifdef CONFIG_MAC80211_QOS
1664         if (hw->queues > IEEE80211_MAX_QUEUES)
1665                 hw->queues = IEEE80211_MAX_QUEUES;
1666         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
1667                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
1668         if (hw->queues < 4)
1669                 hw->ampdu_queues = 0;
1670 #else
1671         hw->queues = 1;
1672         hw->ampdu_queues = 0;
1673 #endif
1674
1675         mdev = alloc_netdev_mq(sizeof(struct wireless_dev),
1676                                "wmaster%d", ether_setup,
1677                                ieee80211_num_queues(hw));
1678         if (!mdev)
1679                 goto fail_mdev_alloc;
1680
1681         if (ieee80211_num_queues(hw) > 1)
1682                 mdev->features |= NETIF_F_MULTI_QUEUE;
1683
1684         mwdev = netdev_priv(mdev);
1685         mdev->ieee80211_ptr = mwdev;
1686         mwdev->wiphy = local->hw.wiphy;
1687
1688         local->mdev = mdev;
1689
1690         ieee80211_rx_bss_list_init(local);
1691
1692         mdev->hard_start_xmit = ieee80211_master_start_xmit;
1693         mdev->open = ieee80211_master_open;
1694         mdev->stop = ieee80211_master_stop;
1695         mdev->type = ARPHRD_IEEE80211;
1696         mdev->header_ops = &ieee80211_header_ops;
1697         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
1698
1699         name = wiphy_dev(local->hw.wiphy)->driver->name;
1700         local->hw.workqueue = create_freezeable_workqueue(name);
1701         if (!local->hw.workqueue) {
1702                 result = -ENOMEM;
1703                 goto fail_workqueue;
1704         }
1705
1706         /*
1707          * The hardware needs headroom for sending the frame,
1708          * and we need some headroom for passing the frame to monitor
1709          * interfaces, but never both at the same time.
1710          */
1711         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1712                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
1713
1714         debugfs_hw_add(local);
1715
1716         if (local->hw.conf.beacon_int < 10)
1717                 local->hw.conf.beacon_int = 100;
1718
1719         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
1720                                                   IEEE80211_HW_SIGNAL_DB |
1721                                                   IEEE80211_HW_SIGNAL_DBM) ?
1722                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1723         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
1724                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1725         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
1726                 local->wstats_flags |= IW_QUAL_DBM;
1727
1728         result = sta_info_start(local);
1729         if (result < 0)
1730                 goto fail_sta_info;
1731
1732         rtnl_lock();
1733         result = dev_alloc_name(local->mdev, local->mdev->name);
1734         if (result < 0)
1735                 goto fail_dev;
1736
1737         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1738         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1739
1740         result = register_netdevice(local->mdev);
1741         if (result < 0)
1742                 goto fail_dev;
1743
1744         result = ieee80211_init_rate_ctrl_alg(local,
1745                                               hw->rate_control_algorithm);
1746         if (result < 0) {
1747                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1748                        "algorithm\n", wiphy_name(local->hw.wiphy));
1749                 goto fail_rate;
1750         }
1751
1752         result = ieee80211_wep_init(local);
1753
1754         if (result < 0) {
1755                 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1756                        wiphy_name(local->hw.wiphy));
1757                 goto fail_wep;
1758         }
1759
1760         ieee80211_install_qdisc(local->mdev);
1761
1762         /* add one default STA interface */
1763         result = ieee80211_if_add(local, "wlan%d", NULL,
1764                                   IEEE80211_IF_TYPE_STA, NULL);
1765         if (result)
1766                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1767                        wiphy_name(local->hw.wiphy));
1768
1769         rtnl_unlock();
1770
1771         ieee80211_led_init(local);
1772
1773         return 0;
1774
1775 fail_wep:
1776         rate_control_deinitialize(local);
1777 fail_rate:
1778         unregister_netdevice(local->mdev);
1779         local->mdev = NULL;
1780 fail_dev:
1781         rtnl_unlock();
1782         sta_info_stop(local);
1783 fail_sta_info:
1784         debugfs_hw_del(local);
1785         destroy_workqueue(local->hw.workqueue);
1786 fail_workqueue:
1787         if (local->mdev)
1788                 free_netdev(local->mdev);
1789 fail_mdev_alloc:
1790         wiphy_unregister(local->hw.wiphy);
1791         return result;
1792 }
1793 EXPORT_SYMBOL(ieee80211_register_hw);
1794
1795 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1796 {
1797         struct ieee80211_local *local = hw_to_local(hw);
1798
1799         tasklet_kill(&local->tx_pending_tasklet);
1800         tasklet_kill(&local->tasklet);
1801
1802         rtnl_lock();
1803
1804         /*
1805          * At this point, interface list manipulations are fine
1806          * because the driver cannot be handing us frames any
1807          * more and the tasklet is killed.
1808          */
1809
1810         /* First, we remove all virtual interfaces. */
1811         ieee80211_remove_interfaces(local);
1812
1813         /* then, finally, remove the master interface */
1814         unregister_netdevice(local->mdev);
1815
1816         rtnl_unlock();
1817
1818         ieee80211_rx_bss_list_deinit(local);
1819         ieee80211_clear_tx_pending(local);
1820         sta_info_stop(local);
1821         rate_control_deinitialize(local);
1822         debugfs_hw_del(local);
1823
1824         if (skb_queue_len(&local->skb_queue)
1825                         || skb_queue_len(&local->skb_queue_unreliable))
1826                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1827                        wiphy_name(local->hw.wiphy));
1828         skb_queue_purge(&local->skb_queue);
1829         skb_queue_purge(&local->skb_queue_unreliable);
1830
1831         destroy_workqueue(local->hw.workqueue);
1832         wiphy_unregister(local->hw.wiphy);
1833         ieee80211_wep_free(local);
1834         ieee80211_led_exit(local);
1835         free_netdev(local->mdev);
1836 }
1837 EXPORT_SYMBOL(ieee80211_unregister_hw);
1838
1839 void ieee80211_free_hw(struct ieee80211_hw *hw)
1840 {
1841         struct ieee80211_local *local = hw_to_local(hw);
1842
1843         wiphy_free(local->hw.wiphy);
1844 }
1845 EXPORT_SYMBOL(ieee80211_free_hw);
1846
1847 static int __init ieee80211_init(void)
1848 {
1849         struct sk_buff *skb;
1850         int ret;
1851
1852         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1853         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1854                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1855
1856         ret = rc80211_pid_init();
1857         if (ret)
1858                 goto out;
1859
1860         ret = ieee80211_wme_register();
1861         if (ret) {
1862                 printk(KERN_DEBUG "ieee80211_init: failed to "
1863                        "initialize WME (err=%d)\n", ret);
1864                 goto out_cleanup_pid;
1865         }
1866
1867         ieee80211_debugfs_netdev_init();
1868
1869         return 0;
1870
1871  out_cleanup_pid:
1872         rc80211_pid_exit();
1873  out:
1874         return ret;
1875 }
1876
1877 static void __exit ieee80211_exit(void)
1878 {
1879         rc80211_pid_exit();
1880
1881         /*
1882          * For key todo, it'll be empty by now but the work
1883          * might still be scheduled.
1884          */
1885         flush_scheduled_work();
1886
1887         if (mesh_allocated)
1888                 ieee80211s_stop();
1889
1890         ieee80211_wme_unregister();
1891         ieee80211_debugfs_netdev_exit();
1892 }
1893
1894
1895 subsys_initcall(ieee80211_init);
1896 module_exit(ieee80211_exit);
1897
1898 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1899 MODULE_LICENSE("GPL");