err.no Git - linux-2.6/blob - net/mac80211/ieee80211.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 "ieee80211_rate.h"
  29 #include "wep.h"
  30 #include "wme.h"
  31 #include "aes_ccm.h"
  32 #include "ieee80211_led.h"
  33 #include "cfg.h"
  34 #include "debugfs.h"
  35 #include "debugfs_netdev.h"
  36
  37 #define SUPP_MCS_SET_LEN 16
  38
  39 /*
  40  * For seeing transmitted packets on monitor interfaces
  41  * we have a radiotap header too.
  42  */
  43 struct ieee80211_tx_status_rtap_hdr {
  44         struct ieee80211_radiotap_header hdr;
  45         __le16 tx_flags;
  46         u8 data_retries;
  47 } __attribute__ ((packed));
  48
  49 /* common interface routines */
  50
  51 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
  52 {
  53         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
  54         return ETH_ALEN;
  55 }
  56
  57 /* must be called under mdev tx lock */
  58 static void ieee80211_configure_filter(struct ieee80211_local *local)
  59 {
  60         unsigned int changed_flags;
  61         unsigned int new_flags = 0;
  62
  63         if (atomic_read(&local->iff_promiscs))
  64                 new_flags |= FIF_PROMISC_IN_BSS;
  65
  66         if (atomic_read(&local->iff_allmultis))
  67                 new_flags |= FIF_ALLMULTI;
  68
  69         if (local->monitors)
  70                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  71
  72         if (local->fif_fcsfail)
  73                 new_flags |= FIF_FCSFAIL;
  74
  75         if (local->fif_plcpfail)
  76                 new_flags |= FIF_PLCPFAIL;
  77
  78         if (local->fif_control)
  79                 new_flags |= FIF_CONTROL;
  80
  81         if (local->fif_other_bss)
  82                 new_flags |= FIF_OTHER_BSS;
  83
  84         changed_flags = local->filter_flags ^ new_flags;
  85
  86         /* be a bit nasty */
  87         new_flags |= (1<<31);
  88
  89         local->ops->configure_filter(local_to_hw(local),
  90                                      changed_flags, &new_flags,
  91                                      local->mdev->mc_count,
  92                                      local->mdev->mc_list);
  93
  94         WARN_ON(new_flags & (1<<31));
  95
  96         local->filter_flags = new_flags & ~(1<<31);
  97 }
  98
  99 /* master interface */
 100
 101 static int ieee80211_master_open(struct net_device *dev)
 102 {
 103         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 104         struct ieee80211_sub_if_data *sdata;
 105         int res = -EOPNOTSUPP;
 106
 107         /* we hold the RTNL here so can safely walk the list */
 108         list_for_each_entry(sdata, &local->interfaces, list) {
 109                 if (sdata->dev != dev && netif_running(sdata->dev)) {
 110                         res = 0;
 111                         break;
 112                 }
 113         }
 114         return res;
 115 }
 116
 117 static int ieee80211_master_stop(struct net_device *dev)
 118 {
 119         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 120         struct ieee80211_sub_if_data *sdata;
 121
 122         /* we hold the RTNL here so can safely walk the list */
 123         list_for_each_entry(sdata, &local->interfaces, list)
 124                 if (sdata->dev != dev && netif_running(sdata->dev))
 125                         dev_close(sdata->dev);
 126
 127         return 0;
 128 }
 129
 130 static void ieee80211_master_set_multicast_list(struct net_device *dev)
 131 {
 132         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 133
 134         ieee80211_configure_filter(local);
 135 }
 136
 137 /* regular interfaces */
 138
 139 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 140 {
 141         /* FIX: what would be proper limits for MTU?
 142          * This interface uses 802.3 frames. */
 143         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6) {
 144                 printk(KERN_WARNING "%s: invalid MTU %d\n",
 145                        dev->name, new_mtu);
 146                 return -EINVAL;
 147         }
 148
 149 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 150         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
 151 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 152         dev->mtu = new_mtu;
 153         return 0;
 154 }
 155
 156 static inline int identical_mac_addr_allowed(int type1, int type2)
 157 {
 158         return (type1 == IEEE80211_IF_TYPE_MNTR ||
 159                 type2 == IEEE80211_IF_TYPE_MNTR ||
 160                 (type1 == IEEE80211_IF_TYPE_AP &&
 161                  type2 == IEEE80211_IF_TYPE_WDS) ||
 162                 (type1 == IEEE80211_IF_TYPE_WDS &&
 163                  (type2 == IEEE80211_IF_TYPE_WDS ||
 164                   type2 == IEEE80211_IF_TYPE_AP)) ||
 165                 (type1 == IEEE80211_IF_TYPE_AP &&
 166                  type2 == IEEE80211_IF_TYPE_VLAN) ||
 167                 (type1 == IEEE80211_IF_TYPE_VLAN &&
 168                  (type2 == IEEE80211_IF_TYPE_AP ||
 169                   type2 == IEEE80211_IF_TYPE_VLAN)));
 170 }
 171
 172 static int ieee80211_open(struct net_device *dev)
 173 {
 174         struct ieee80211_sub_if_data *sdata, *nsdata;
 175         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 176         struct ieee80211_if_init_conf conf;
 177         int res;
 178         bool need_hw_reconfig = 0;
 179
 180         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 181
 182         /* we hold the RTNL here so can safely walk the list */
 183         list_for_each_entry(nsdata, &local->interfaces, list) {
 184                 struct net_device *ndev = nsdata->dev;
 185
 186                 if (ndev != dev && ndev != local->mdev && netif_running(ndev)) {
 187                         /*
 188                          * Allow only a single IBSS interface to be up at any
 189                          * time. This is restricted because beacon distribution
 190                          * cannot work properly if both are in the same IBSS.
 191                          *
 192                          * To remove this restriction we'd have to disallow them
 193                          * from setting the same SSID on different IBSS interfaces
 194                          * belonging to the same hardware. Then, however, we're
 195                          * faced with having to adopt two different TSF timers...
 196                          */
 197                         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
 198                             nsdata->vif.type == IEEE80211_IF_TYPE_IBSS)
 199                                 return -EBUSY;
 200
 201                         /*
 202                          * Disallow multiple IBSS/STA mode interfaces.
 203                          *
 204                          * This is a technical restriction, it is possible although
 205                          * most likely not IEEE 802.11 compliant to have multiple
 206                          * STAs with just a single hardware (the TSF timer will not
 207                          * be adjusted properly.)
 208                          *
 209                          * However, because mac80211 uses the master device's BSS
 210                          * information for each STA/IBSS interface, doing this will
 211                          * currently corrupt that BSS information completely, unless,
 212                          * a not very useful case, both STAs are associated to the
 213                          * same BSS.
 214                          *
 215                          * To remove this restriction, the BSS information needs to
 216                          * be embedded in the STA/IBSS mode sdata instead of using
 217                          * the master device's BSS structure.
 218                          */
 219                         if ((sdata->vif.type == IEEE80211_IF_TYPE_STA ||
 220                              sdata->vif.type == IEEE80211_IF_TYPE_IBSS) &&
 221                             (nsdata->vif.type == IEEE80211_IF_TYPE_STA ||
 222                              nsdata->vif.type == IEEE80211_IF_TYPE_IBSS))
 223                                 return -EBUSY;
 224
 225                         /*
 226                          * The remaining checks are only performed for interfaces
 227                          * with the same MAC address.
 228                          */
 229                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 230                                 continue;
 231
 232                         /*
 233                          * check whether it may have the same address
 234                          */
 235                         if (!identical_mac_addr_allowed(sdata->vif.type,
 236                                                         nsdata->vif.type))
 237                                 return -ENOTUNIQ;
 238
 239                         /*
 240                          * can only add VLANs to enabled APs
 241                          */
 242                         if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN &&
 243                             nsdata->vif.type == IEEE80211_IF_TYPE_AP)
 244                                 sdata->u.vlan.ap = nsdata;
 245                 }
 246         }
 247
 248         switch (sdata->vif.type) {
 249         case IEEE80211_IF_TYPE_WDS:
 250                 if (is_zero_ether_addr(sdata->u.wds.remote_addr))
 251                         return -ENOLINK;
 252                 break;
 253         case IEEE80211_IF_TYPE_VLAN:
 254                 if (!sdata->u.vlan.ap)
 255                         return -ENOLINK;
 256                 break;
 257         case IEEE80211_IF_TYPE_AP:
 258         case IEEE80211_IF_TYPE_STA:
 259         case IEEE80211_IF_TYPE_MNTR:
 260         case IEEE80211_IF_TYPE_IBSS:
 261         case IEEE80211_IF_TYPE_MESH_POINT:
 262                 /* no special treatment */
 263                 break;
 264         case IEEE80211_IF_TYPE_INVALID:
 265                 /* cannot happen */
 266                 WARN_ON(1);
 267                 break;
 268         }
 269
 270         if (local->open_count == 0) {
 271                 res = 0;
 272                 if (local->ops->start)
 273                         res = local->ops->start(local_to_hw(local));
 274                 if (res)
 275                         return res;
 276                 need_hw_reconfig = 1;
 277                 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
 278         }
 279
 280         switch (sdata->vif.type) {
 281         case IEEE80211_IF_TYPE_VLAN:
 282                 list_add(&sdata->u.vlan.list, &sdata->u.vlan.ap->u.ap.vlans);
 283                 /* no need to tell driver */
 284                 break;
 285         case IEEE80211_IF_TYPE_MNTR:
 286                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 287                         local->cooked_mntrs++;
 288                         break;
 289                 }
 290
 291                 /* must be before the call to ieee80211_configure_filter */
 292                 local->monitors++;
 293                 if (local->monitors == 1)
 294                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 295
 296                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 297                         local->fif_fcsfail++;
 298                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 299                         local->fif_plcpfail++;
 300                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 301                         local->fif_control++;
 302                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 303                         local->fif_other_bss++;
 304
 305                 netif_tx_lock_bh(local->mdev);
 306                 ieee80211_configure_filter(local);
 307                 netif_tx_unlock_bh(local->mdev);
 308                 break;
 309         case IEEE80211_IF_TYPE_STA:
 310         case IEEE80211_IF_TYPE_IBSS:
 311                 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
 312                 /* fall through */
 313         default:
 314                 conf.vif = &sdata->vif;
 315                 conf.type = sdata->vif.type;
 316                 conf.mac_addr = dev->dev_addr;
 317                 res = local->ops->add_interface(local_to_hw(local), &conf);
 318                 if (res && !local->open_count && local->ops->stop)
 319                         local->ops->stop(local_to_hw(local));
 320                 if (res)
 321                         return res;
 322
 323                 ieee80211_if_config(dev);
 324                 ieee80211_reset_erp_info(dev);
 325                 ieee80211_enable_keys(sdata);
 326
 327                 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
 328                     !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
 329                         netif_carrier_off(dev);
 330                 else
 331                         netif_carrier_on(dev);
 332         }
 333
 334         if (local->open_count == 0) {
 335                 res = dev_open(local->mdev);
 336                 WARN_ON(res);
 337                 tasklet_enable(&local->tx_pending_tasklet);
 338                 tasklet_enable(&local->tasklet);
 339         }
 340
 341         /*
 342          * set_multicast_list will be invoked by the networking core
 343          * which will check whether any increments here were done in
 344          * error and sync them down to the hardware as filter flags.
 345          */
 346         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 347                 atomic_inc(&local->iff_allmultis);
 348
 349         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 350                 atomic_inc(&local->iff_promiscs);
 351
 352         local->open_count++;
 353         if (need_hw_reconfig)
 354                 ieee80211_hw_config(local);
 355
 356         netif_start_queue(dev);
 357
 358         return 0;
 359 }
 360
 361 static int ieee80211_stop(struct net_device *dev)
 362 {
 363         struct ieee80211_sub_if_data *sdata;
 364         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 365         struct ieee80211_if_init_conf conf;
 366         struct sta_info *sta;
 367         int i;
 368
 369         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 370
 371         list_for_each_entry(sta, &local->sta_list, list) {
 372                 if (sta->dev == dev)
 373                         for (i = 0; i <  STA_TID_NUM; i++)
 374                                 ieee80211_sta_stop_rx_ba_session(sta->dev,
 375                                                 sta->addr, i,
 376                                                 WLAN_BACK_RECIPIENT,
 377                                                 WLAN_REASON_QSTA_LEAVE_QBSS);
 378         }
 379
 380         netif_stop_queue(dev);
 381
 382         /*
 383          * Don't count this interface for promisc/allmulti while it
 384          * is down. dev_mc_unsync() will invoke set_multicast_list
 385          * on the master interface which will sync these down to the
 386          * hardware as filter flags.
 387          */
 388         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 389                 atomic_dec(&local->iff_allmultis);
 390
 391         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 392                 atomic_dec(&local->iff_promiscs);
 393
 394         dev_mc_unsync(local->mdev, dev);
 395
 396         /* APs need special treatment */
 397         if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
 398                 struct ieee80211_sub_if_data *vlan, *tmp;
 399                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 400
 401                 /* remove beacon */
 402                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 403                 synchronize_rcu();
 404                 kfree(old_beacon);
 405
 406                 /* down all dependent devices, that is VLANs */
 407                 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
 408                                          u.vlan.list)
 409                         dev_close(vlan->dev);
 410                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 411         }
 412
 413         local->open_count--;
 414
 415         switch (sdata->vif.type) {
 416         case IEEE80211_IF_TYPE_VLAN:
 417                 list_del(&sdata->u.vlan.list);
 418                 sdata->u.vlan.ap = NULL;
 419                 /* no need to tell driver */
 420                 break;
 421         case IEEE80211_IF_TYPE_MNTR:
 422                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 423                         local->cooked_mntrs--;
 424                         break;
 425                 }
 426
 427                 local->monitors--;
 428                 if (local->monitors == 0)
 429                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
 430
 431                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 432                         local->fif_fcsfail--;
 433                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 434                         local->fif_plcpfail--;
 435                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 436                         local->fif_control--;
 437                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 438                         local->fif_other_bss--;
 439
 440                 netif_tx_lock_bh(local->mdev);
 441                 ieee80211_configure_filter(local);
 442                 netif_tx_unlock_bh(local->mdev);
 443                 break;
 444         case IEEE80211_IF_TYPE_STA:
 445         case IEEE80211_IF_TYPE_IBSS:
 446                 sdata->u.sta.state = IEEE80211_DISABLED;
 447                 del_timer_sync(&sdata->u.sta.timer);
 448                 /*
 449                  * When we get here, the interface is marked down.
 450                  * Call synchronize_rcu() to wait for the RX path
 451                  * should it be using the interface and enqueuing
 452                  * frames at this very time on another CPU.
 453                  */
 454                 synchronize_rcu();
 455                 skb_queue_purge(&sdata->u.sta.skb_queue);
 456
 457                 if (local->scan_dev == sdata->dev) {
 458                         if (!local->ops->hw_scan) {
 459                                 local->sta_sw_scanning = 0;
 460                                 cancel_delayed_work(&local->scan_work);
 461                         } else
 462                                 local->sta_hw_scanning = 0;
 463                 }
 464
 465                 flush_workqueue(local->hw.workqueue);
 466
 467                 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
 468                 kfree(sdata->u.sta.extra_ie);
 469                 sdata->u.sta.extra_ie = NULL;
 470                 sdata->u.sta.extra_ie_len = 0;
 471                 /* fall through */
 472         default:
 473                 conf.vif = &sdata->vif;
 474                 conf.type = sdata->vif.type;
 475                 conf.mac_addr = dev->dev_addr;
 476                 /* disable all keys for as long as this netdev is down */
 477                 ieee80211_disable_keys(sdata);
 478                 local->ops->remove_interface(local_to_hw(local), &conf);
 479         }
 480
 481         if (local->open_count == 0) {
 482                 if (netif_running(local->mdev))
 483                         dev_close(local->mdev);
 484
 485                 if (local->ops->stop)
 486                         local->ops->stop(local_to_hw(local));
 487
 488                 ieee80211_led_radio(local, 0);
 489
 490                 tasklet_disable(&local->tx_pending_tasklet);
 491                 tasklet_disable(&local->tasklet);
 492         }
 493
 494         return 0;
 495 }
 496
 497 int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid)
 498 {
 499         struct ieee80211_local *local = hw_to_local(hw);
 500         struct sta_info *sta;
 501         struct ieee80211_sub_if_data *sdata;
 502         u16 start_seq_num = 0;
 503         u8 *state;
 504         int ret;
 505         DECLARE_MAC_BUF(mac);
 506
 507         if (tid >= STA_TID_NUM)
 508                 return -EINVAL;
 509
 510 #ifdef CONFIG_MAC80211_HT_DEBUG
 511         printk(KERN_DEBUG "Open BA session requested for %s tid %u\n",
 512                                 print_mac(mac, ra), tid);
 513 #endif /* CONFIG_MAC80211_HT_DEBUG */
 514
 515         sta = sta_info_get(local, ra);
 516         if (!sta) {
 517                 printk(KERN_DEBUG "Could not find the station\n");
 518                 return -ENOENT;
 519         }
 520
 521         spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
 522
 523         /* we have tried too many times, receiver does not want A-MPDU */
 524         if (sta->ampdu_mlme.tid_tx[tid].addba_req_num > HT_AGG_MAX_RETRIES) {
 525                 ret = -EBUSY;
 526                 goto start_ba_exit;
 527         }
 528
 529         state = &sta->ampdu_mlme.tid_tx[tid].state;
 530         /* check if the TID is not in aggregation flow already */
 531         if (*state != HT_AGG_STATE_IDLE) {
 532 #ifdef CONFIG_MAC80211_HT_DEBUG
 533                 printk(KERN_DEBUG "BA request denied - session is not "
 534                                  "idle on tid %u\n", tid);
 535 #endif /* CONFIG_MAC80211_HT_DEBUG */
 536                 ret = -EAGAIN;
 537                 goto start_ba_exit;
 538         }
 539
 540         /* ensure that TX flow won't interrupt us
 541          * until the end of the call to requeue function */
 542         spin_lock_bh(&local->mdev->queue_lock);
 543
 544         /* create a new queue for this aggregation */
 545         ret = ieee80211_ht_agg_queue_add(local, sta, tid);
 546
 547         /* case no queue is available to aggregation
 548          * don't switch to aggregation */
 549         if (ret) {
 550 #ifdef CONFIG_MAC80211_HT_DEBUG
 551                 printk(KERN_DEBUG "BA request denied - no queue available for"
 552                                         " tid %d\n", tid);
 553 #endif /* CONFIG_MAC80211_HT_DEBUG */
 554                 spin_unlock_bh(&local->mdev->queue_lock);
 555                 goto start_ba_exit;
 556         }
 557         sdata = IEEE80211_DEV_TO_SUB_IF(sta->dev);
 558
 559         /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
 560          * call back right away, it must see that the flow has begun */
 561         *state |= HT_ADDBA_REQUESTED_MSK;
 562
 563         if (local->ops->ampdu_action)
 564                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
 565                                                 ra, tid, &start_seq_num);
 566
 567         if (ret) {
 568                 /* No need to requeue the packets in the agg queue, since we
 569                  * held the tx lock: no packet could be enqueued to the newly
 570                  * allocated queue */
 571                  ieee80211_ht_agg_queue_remove(local, sta, tid, 0);
 572 #ifdef CONFIG_MAC80211_HT_DEBUG
 573                 printk(KERN_DEBUG "BA request denied - HW or queue unavailable"
 574                                 " for tid %d\n", tid);
 575 #endif /* CONFIG_MAC80211_HT_DEBUG */
 576                 spin_unlock_bh(&local->mdev->queue_lock);
 577                 *state = HT_AGG_STATE_IDLE;
 578                 goto start_ba_exit;
 579         }
 580
 581         /* Will put all the packets in the new SW queue */
 582         ieee80211_requeue(local, ieee802_1d_to_ac[tid]);
 583         spin_unlock_bh(&local->mdev->queue_lock);
 584
 585         /* We have most probably almost emptied the legacy queue */
 586         /* ieee80211_wake_queue(local_to_hw(local), ieee802_1d_to_ac[tid]); */
 587
 588         /* send an addBA request */
 589         sta->ampdu_mlme.dialog_token_allocator++;
 590         sta->ampdu_mlme.tid_tx[tid].dialog_token =
 591                         sta->ampdu_mlme.dialog_token_allocator;
 592         sta->ampdu_mlme.tid_tx[tid].ssn = start_seq_num;
 593
 594         ieee80211_send_addba_request(sta->dev, ra, tid,
 595                          sta->ampdu_mlme.tid_tx[tid].dialog_token,
 596                          sta->ampdu_mlme.tid_tx[tid].ssn,
 597                          0x40, 5000);
 598
 599         /* activate the timer for the recipient's addBA response */
 600         sta->ampdu_mlme.tid_tx[tid].addba_resp_timer.expires =
 601                                 jiffies + ADDBA_RESP_INTERVAL;
 602         add_timer(&sta->ampdu_mlme.tid_tx[tid].addba_resp_timer);
 603         printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
 604
 605 start_ba_exit:
 606         spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
 607         sta_info_put(sta);
 608         return ret;
 609 }
 610 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
 611
 612 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
 613                                  u8 *ra, u16 tid,
 614                                  enum ieee80211_back_parties initiator)
 615 {
 616         struct ieee80211_local *local = hw_to_local(hw);
 617         struct sta_info *sta;
 618         u8 *state;
 619         int ret = 0;
 620         DECLARE_MAC_BUF(mac);
 621
 622         if (tid >= STA_TID_NUM)
 623                 return -EINVAL;
 624
 625 #ifdef CONFIG_MAC80211_HT_DEBUG
 626         printk(KERN_DEBUG "Stop a BA session requested for %s tid %u\n",
 627                                 print_mac(mac, ra), tid);
 628 #endif /* CONFIG_MAC80211_HT_DEBUG */
 629
 630         sta = sta_info_get(local, ra);
 631         if (!sta)
 632                 return -ENOENT;
 633
 634         /* check if the TID is in aggregation */
 635         state = &sta->ampdu_mlme.tid_tx[tid].state;
 636         spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
 637
 638         if (*state != HT_AGG_STATE_OPERATIONAL) {
 639 #ifdef CONFIG_MAC80211_HT_DEBUG
 640                 printk(KERN_DEBUG "Try to stop Tx aggregation on"
 641                                 " non active TID\n");
 642 #endif /* CONFIG_MAC80211_HT_DEBUG */
 643                 ret = -ENOENT;
 644                 goto stop_BA_exit;
 645         }
 646
 647         ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]);
 648
 649         *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
 650                 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
 651
 652         if (local->ops->ampdu_action)
 653                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP,
 654                                                 ra, tid, NULL);
 655
 656         /* case HW denied going back to legacy */
 657         if (ret) {
 658                 WARN_ON(ret != -EBUSY);
 659                 *state = HT_AGG_STATE_OPERATIONAL;
 660                 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
 661                 goto stop_BA_exit;
 662         }
 663
 664 stop_BA_exit:
 665         spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
 666         sta_info_put(sta);
 667         return ret;
 668 }
 669 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
 670
 671 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
 672 {
 673         struct ieee80211_local *local = hw_to_local(hw);
 674         struct sta_info *sta;
 675         u8 *state;
 676         DECLARE_MAC_BUF(mac);
 677
 678         if (tid >= STA_TID_NUM) {
 679                 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
 680                                 tid, STA_TID_NUM);
 681                 return;
 682         }
 683
 684         sta = sta_info_get(local, ra);
 685         if (!sta) {
 686                 printk(KERN_DEBUG "Could not find station: %s\n",
 687                                 print_mac(mac, ra));
 688                 return;
 689         }
 690
 691         state = &sta->ampdu_mlme.tid_tx[tid].state;
 692         spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
 693
 694         if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
 695                 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
 696                                 *state);
 697                 spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
 698                 sta_info_put(sta);
 699                 return;
 700         }
 701
 702         WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK);
 703
 704         *state |= HT_ADDBA_DRV_READY_MSK;
 705
 706         if (*state == HT_AGG_STATE_OPERATIONAL) {
 707                 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
 708                 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
 709         }
 710         spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
 711         sta_info_put(sta);
 712 }
 713 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
 714
 715 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
 716 {
 717         struct ieee80211_local *local = hw_to_local(hw);
 718         struct sta_info *sta;
 719         u8 *state;
 720         int agg_queue;
 721         DECLARE_MAC_BUF(mac);
 722
 723         if (tid >= STA_TID_NUM) {
 724                 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
 725                                 tid, STA_TID_NUM);
 726                 return;
 727         }
 728
 729         printk(KERN_DEBUG "Stop a BA session requested on DA %s tid %d\n",
 730                                 print_mac(mac, ra), tid);
 731
 732         sta = sta_info_get(local, ra);
 733         if (!sta) {
 734                 printk(KERN_DEBUG "Could not find station: %s\n",
 735                                 print_mac(mac, ra));
 736                 return;
 737         }
 738         state = &sta->ampdu_mlme.tid_tx[tid].state;
 739
 740         spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
 741         if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
 742                 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
 743                 sta_info_put(sta);
 744                 spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
 745                 return;
 746         }
 747
 748         if (*state & HT_AGG_STATE_INITIATOR_MSK)
 749                 ieee80211_send_delba(sta->dev, ra, tid,
 750                         WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
 751
 752         agg_queue = sta->tid_to_tx_q[tid];
 753
 754         /* avoid ordering issues: we are the only one that can modify
 755          * the content of the qdiscs */
 756         spin_lock_bh(&local->mdev->queue_lock);
 757         /* remove the queue for this aggregation */
 758         ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
 759         spin_unlock_bh(&local->mdev->queue_lock);
 760
 761         /* we just requeued the all the frames that were in the removed
 762          * queue, and since we might miss a softirq we do netif_schedule.
 763          * ieee80211_wake_queue is not used here as this queue is not
 764          * necessarily stopped */
 765         netif_schedule(local->mdev);
 766         *state = HT_AGG_STATE_IDLE;
 767         sta->ampdu_mlme.tid_tx[tid].addba_req_num = 0;
 768         spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
 769
 770         sta_info_put(sta);
 771 }
 772 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
 773
 774 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
 775                                       const u8 *ra, u16 tid)
 776 {
 777         struct ieee80211_local *local = hw_to_local(hw);
 778         struct ieee80211_ra_tid *ra_tid;
 779         struct sk_buff *skb = dev_alloc_skb(0);
 780
 781         if (unlikely(!skb)) {
 782                 if (net_ratelimit())
 783                         printk(KERN_WARNING "%s: Not enough memory, "
 784                                "dropping start BA session", skb->dev->name);
 785                 return;
 786         }
 787         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 788         memcpy(&ra_tid->ra, ra, ETH_ALEN);
 789         ra_tid->tid = tid;
 790
 791         skb->pkt_type = IEEE80211_ADDBA_MSG;
 792         skb_queue_tail(&local->skb_queue, skb);
 793         tasklet_schedule(&local->tasklet);
 794 }
 795 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
 796
 797 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
 798                                      const u8 *ra, u16 tid)
 799 {
 800         struct ieee80211_local *local = hw_to_local(hw);
 801         struct ieee80211_ra_tid *ra_tid;
 802         struct sk_buff *skb = dev_alloc_skb(0);
 803
 804         if (unlikely(!skb)) {
 805                 if (net_ratelimit())
 806                         printk(KERN_WARNING "%s: Not enough memory, "
 807                                "dropping stop BA session", skb->dev->name);
 808                 return;
 809         }
 810         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 811         memcpy(&ra_tid->ra, ra, ETH_ALEN);
 812         ra_tid->tid = tid;
 813
 814         skb->pkt_type = IEEE80211_DELBA_MSG;
 815         skb_queue_tail(&local->skb_queue, skb);
 816         tasklet_schedule(&local->tasklet);
 817 }
 818 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
 819
 820 static void ieee80211_set_multicast_list(struct net_device *dev)
 821 {
 822         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 823         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 824         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 825
 826         allmulti = !!(dev->flags & IFF_ALLMULTI);
 827         promisc = !!(dev->flags & IFF_PROMISC);
 828         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 829         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 830
 831         if (allmulti != sdata_allmulti) {
 832                 if (dev->flags & IFF_ALLMULTI)
 833                         atomic_inc(&local->iff_allmultis);
 834                 else
 835                         atomic_dec(&local->iff_allmultis);
 836                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 837         }
 838
 839         if (promisc != sdata_promisc) {
 840                 if (dev->flags & IFF_PROMISC)
 841                         atomic_inc(&local->iff_promiscs);
 842                 else
 843                         atomic_dec(&local->iff_promiscs);
 844                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 845         }
 846
 847         dev_mc_sync(local->mdev, dev);
 848 }
 849
 850 static const struct header_ops ieee80211_header_ops = {
 851         .create         = eth_header,
 852         .parse          = header_parse_80211,
 853         .rebuild        = eth_rebuild_header,
 854         .cache          = eth_header_cache,
 855         .cache_update   = eth_header_cache_update,
 856 };
 857
 858 /* Must not be called for mdev */
 859 void ieee80211_if_setup(struct net_device *dev)
 860 {
 861         ether_setup(dev);
 862         dev->hard_start_xmit = ieee80211_subif_start_xmit;
 863         dev->wireless_handlers = &ieee80211_iw_handler_def;
 864         dev->set_multicast_list = ieee80211_set_multicast_list;
 865         dev->change_mtu = ieee80211_change_mtu;
 866         dev->open = ieee80211_open;
 867         dev->stop = ieee80211_stop;
 868         dev->destructor = ieee80211_if_free;
 869 }
 870
 871 /* WDS specialties */
 872
 873 int ieee80211_if_update_wds(struct net_device *dev, u8 *remote_addr)
 874 {
 875         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 876         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 877         struct sta_info *sta;
 878         DECLARE_MAC_BUF(mac);
 879
 880         if (compare_ether_addr(remote_addr, sdata->u.wds.remote_addr) == 0)
 881                 return 0;
 882
 883         /* Create STA entry for the new peer */
 884         sta = sta_info_add(local, dev, remote_addr, GFP_KERNEL);
 885         if (IS_ERR(sta))
 886                 return PTR_ERR(sta);
 887
 888         sta->flags |= WLAN_STA_AUTHORIZED;
 889
 890         sta_info_put(sta);
 891
 892         /* Remove STA entry for the old peer */
 893         sta = sta_info_get(local, sdata->u.wds.remote_addr);
 894         if (sta) {
 895                 sta_info_free(sta);
 896                 sta_info_put(sta);
 897         } else {
 898                 printk(KERN_DEBUG "%s: could not find STA entry for WDS link "
 899                        "peer %s\n",
 900                        dev->name, print_mac(mac, sdata->u.wds.remote_addr));
 901         }
 902
 903         /* Update WDS link data */
 904         memcpy(&sdata->u.wds.remote_addr, remote_addr, ETH_ALEN);
 905
 906         return 0;
 907 }
 908
 909 /* everything else */
 910
 911 static int __ieee80211_if_config(struct net_device *dev,
 912                                  struct sk_buff *beacon,
 913                                  struct ieee80211_tx_control *control)
 914 {
 915         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 916         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 917         struct ieee80211_if_conf conf;
 918
 919         if (!local->ops->config_interface || !netif_running(dev))
 920                 return 0;
 921
 922         memset(&conf, 0, sizeof(conf));
 923         conf.type = sdata->vif.type;
 924         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
 925             sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
 926                 conf.bssid = sdata->u.sta.bssid;
 927                 conf.ssid = sdata->u.sta.ssid;
 928                 conf.ssid_len = sdata->u.sta.ssid_len;
 929         } else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
 930                 conf.ssid = sdata->u.ap.ssid;
 931                 conf.ssid_len = sdata->u.ap.ssid_len;
 932                 conf.beacon = beacon;
 933                 conf.beacon_control = control;
 934         }
 935         return local->ops->config_interface(local_to_hw(local),
 936                                             &sdata->vif, &conf);
 937 }
 938
 939 int ieee80211_if_config(struct net_device *dev)
 940 {
 941         return __ieee80211_if_config(dev, NULL, NULL);
 942 }
 943
 944 int ieee80211_if_config_beacon(struct net_device *dev)
 945 {
 946         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 947         struct ieee80211_tx_control control;
 948         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 949         struct sk_buff *skb;
 950
 951         if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
 952                 return 0;
 953         skb = ieee80211_beacon_get(local_to_hw(local), &sdata->vif,
 954                                    &control);
 955         if (!skb)
 956                 return -ENOMEM;
 957         return __ieee80211_if_config(dev, skb, &control);
 958 }
 959
 960 int ieee80211_hw_config(struct ieee80211_local *local)
 961 {
 962         struct ieee80211_channel *chan;
 963         int ret = 0;
 964
 965         if (local->sta_sw_scanning)
 966                 chan = local->scan_channel;
 967         else
 968                 chan = local->oper_channel;
 969
 970         local->hw.conf.channel = chan;
 971
 972         if (!local->hw.conf.power_level)
 973                 local->hw.conf.power_level = chan->max_power;
 974         else
 975                 local->hw.conf.power_level = min(chan->max_power,
 976                                                local->hw.conf.power_level);
 977
 978         local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
 979
 980 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 981         printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
 982                wiphy_name(local->hw.wiphy), chan->center_freq);
 983 #endif
 984
 985         if (local->open_count)
 986                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
 987
 988         return ret;
 989 }
 990
 991 /**
 992  * ieee80211_hw_config_ht should be used only after legacy configuration
 993  * has been determined, as ht configuration depends upon the hardware's
 994  * HT abilities for a _specific_ band.
 995  */
 996 int ieee80211_hw_config_ht(struct ieee80211_local *local, int enable_ht,
 997                            struct ieee80211_ht_info *req_ht_cap,
 998                            struct ieee80211_ht_bss_info *req_bss_cap)
 999 {
1000         struct ieee80211_conf *conf = &local->hw.conf;
1001         struct ieee80211_supported_band *sband;
1002         int i;
1003
1004         sband = local->hw.wiphy->bands[conf->channel->band];
1005
1006         /* HT is not supported */
1007         if (!sband->ht_info.ht_supported) {
1008                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1009                 return -EOPNOTSUPP;
1010         }
1011
1012         /* disable HT */
1013         if (!enable_ht) {
1014                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1015         } else {
1016                 conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
1017                 conf->ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
1018                 conf->ht_conf.cap &= ~(IEEE80211_HT_CAP_MIMO_PS);
1019                 conf->ht_conf.cap |=
1020                         sband->ht_info.cap & IEEE80211_HT_CAP_MIMO_PS;
1021                 conf->ht_bss_conf.primary_channel =
1022                         req_bss_cap->primary_channel;
1023                 conf->ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
1024                 conf->ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
1025                 for (i = 0; i < SUPP_MCS_SET_LEN; i++)
1026                         conf->ht_conf.supp_mcs_set[i] =
1027                                 sband->ht_info.supp_mcs_set[i] &
1028                                   req_ht_cap->supp_mcs_set[i];
1029
1030                 /* In STA mode, this gives us indication
1031                  * to the AP's mode of operation */
1032                 conf->ht_conf.ht_supported = 1;
1033                 conf->ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
1034                 conf->ht_conf.ampdu_density = req_ht_cap->ampdu_density;
1035         }
1036
1037         local->ops->conf_ht(local_to_hw(local), &local->hw.conf);
1038
1039         return 0;
1040 }
1041
1042 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1043                                       u32 changed)
1044 {
1045         struct ieee80211_local *local = sdata->local;
1046
1047         if (!changed)
1048                 return;
1049
1050         if (local->ops->bss_info_changed)
1051                 local->ops->bss_info_changed(local_to_hw(local),
1052                                              &sdata->vif,
1053                                              &sdata->bss_conf,
1054                                              changed);
1055 }
1056
1057 void ieee80211_reset_erp_info(struct net_device *dev)
1058 {
1059         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1060
1061         sdata->bss_conf.use_cts_prot = 0;
1062         sdata->bss_conf.use_short_preamble = 0;
1063         ieee80211_bss_info_change_notify(sdata,
1064                                          BSS_CHANGED_ERP_CTS_PROT |
1065                                          BSS_CHANGED_ERP_PREAMBLE);
1066 }
1067
1068 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
1069                                  struct sk_buff *skb,
1070                                  struct ieee80211_tx_status *status)
1071 {
1072         struct ieee80211_local *local = hw_to_local(hw);
1073         struct ieee80211_tx_status *saved;
1074         int tmp;
1075
1076         skb->dev = local->mdev;
1077         saved = kmalloc(sizeof(struct ieee80211_tx_status), GFP_ATOMIC);
1078         if (unlikely(!saved)) {
1079                 if (net_ratelimit())
1080                         printk(KERN_WARNING "%s: Not enough memory, "
1081                                "dropping tx status", skb->dev->name);
1082                 /* should be dev_kfree_skb_irq, but due to this function being
1083                  * named _irqsafe instead of just _irq we can't be sure that
1084                  * people won't call it from non-irq contexts */
1085                 dev_kfree_skb_any(skb);
1086                 return;
1087         }
1088         memcpy(saved, status, sizeof(struct ieee80211_tx_status));
1089         /* copy pointer to saved status into skb->cb for use by tasklet */
1090         memcpy(skb->cb, &saved, sizeof(saved));
1091
1092         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
1093         skb_queue_tail(status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS ?
1094                        &local->skb_queue : &local->skb_queue_unreliable, skb);
1095         tmp = skb_queue_len(&local->skb_queue) +
1096                 skb_queue_len(&local->skb_queue_unreliable);
1097         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
1098                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1099                 memcpy(&saved, skb->cb, sizeof(saved));
1100                 kfree(saved);
1101                 dev_kfree_skb_irq(skb);
1102                 tmp--;
1103                 I802_DEBUG_INC(local->tx_status_drop);
1104         }
1105         tasklet_schedule(&local->tasklet);
1106 }
1107 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
1108
1109 static void ieee80211_tasklet_handler(unsigned long data)
1110 {
1111         struct ieee80211_local *local = (struct ieee80211_local *) data;
1112         struct sk_buff *skb;
1113         struct ieee80211_rx_status rx_status;
1114         struct ieee80211_tx_status *tx_status;
1115         struct ieee80211_ra_tid *ra_tid;
1116
1117         while ((skb = skb_dequeue(&local->skb_queue)) ||
1118                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1119                 switch (skb->pkt_type) {
1120                 case IEEE80211_RX_MSG:
1121                         /* status is in skb->cb */
1122                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
1123                         /* Clear skb->pkt_type in order to not confuse kernel
1124                          * netstack. */
1125                         skb->pkt_type = 0;
1126                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
1127                         break;
1128                 case IEEE80211_TX_STATUS_MSG:
1129                         /* get pointer to saved status out of skb->cb */
1130                         memcpy(&tx_status, skb->cb, sizeof(tx_status));
1131                         skb->pkt_type = 0;
1132                         ieee80211_tx_status(local_to_hw(local),
1133                                             skb, tx_status);
1134                         kfree(tx_status);
1135                         break;
1136                 case IEEE80211_DELBA_MSG:
1137                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1138                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
1139                                                 ra_tid->ra, ra_tid->tid);
1140                         dev_kfree_skb(skb);
1141                         break;
1142                 case IEEE80211_ADDBA_MSG:
1143                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1144                         ieee80211_start_tx_ba_cb(local_to_hw(local),
1145                                                  ra_tid->ra, ra_tid->tid);
1146                         dev_kfree_skb(skb);
1147                         break ;
1148                 default: /* should never get here! */
1149                         printk(KERN_ERR "%s: Unknown message type (%d)\n",
1150                                wiphy_name(local->hw.wiphy), skb->pkt_type);
1151                         dev_kfree_skb(skb);
1152                         break;
1153                 }
1154         }
1155 }
1156
1157 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
1158  * make a prepared TX frame (one that has been given to hw) to look like brand
1159  * new IEEE 802.11 frame that is ready to go through TX processing again.
1160  * Also, tx_packet_data in cb is restored from tx_control. */
1161 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
1162                                       struct ieee80211_key *key,
1163                                       struct sk_buff *skb,
1164                                       struct ieee80211_tx_control *control)
1165 {
1166         int hdrlen, iv_len, mic_len;
1167         struct ieee80211_tx_packet_data *pkt_data;
1168
1169         pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1170         pkt_data->ifindex = vif_to_sdata(control->vif)->dev->ifindex;
1171         pkt_data->flags = 0;
1172         if (control->flags & IEEE80211_TXCTL_REQ_TX_STATUS)
1173                 pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
1174         if (control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT)
1175                 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1176         if (control->flags & IEEE80211_TXCTL_REQUEUE)
1177                 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
1178         if (control->flags & IEEE80211_TXCTL_EAPOL_FRAME)
1179                 pkt_data->flags |= IEEE80211_TXPD_EAPOL_FRAME;
1180         pkt_data->queue = control->queue;
1181
1182         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1183
1184         if (!key)
1185                 goto no_key;
1186
1187         switch (key->conf.alg) {
1188         case ALG_WEP:
1189                 iv_len = WEP_IV_LEN;
1190                 mic_len = WEP_ICV_LEN;
1191                 break;
1192         case ALG_TKIP:
1193                 iv_len = TKIP_IV_LEN;
1194                 mic_len = TKIP_ICV_LEN;
1195                 break;
1196         case ALG_CCMP:
1197                 iv_len = CCMP_HDR_LEN;
1198                 mic_len = CCMP_MIC_LEN;
1199                 break;
1200         default:
1201                 goto no_key;
1202         }
1203
1204         if (skb->len >= mic_len &&
1205             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
1206                 skb_trim(skb, skb->len - mic_len);
1207         if (skb->len >= iv_len && skb->len > hdrlen) {
1208                 memmove(skb->data + iv_len, skb->data, hdrlen);
1209                 skb_pull(skb, iv_len);
1210         }
1211
1212 no_key:
1213         {
1214                 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1215                 u16 fc = le16_to_cpu(hdr->frame_control);
1216                 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
1217                         fc &= ~IEEE80211_STYPE_QOS_DATA;
1218                         hdr->frame_control = cpu_to_le16(fc);
1219                         memmove(skb->data + 2, skb->data, hdrlen - 2);
1220                         skb_pull(skb, 2);
1221                 }
1222         }
1223 }
1224
1225 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
1226                                             struct sta_info *sta,
1227                                             struct sk_buff *skb,
1228                                             struct ieee80211_tx_status *status)
1229 {
1230         sta->tx_filtered_count++;
1231
1232         /*
1233          * Clear the TX filter mask for this STA when sending the next
1234          * packet. If the STA went to power save mode, this will happen
1235          * happen when it wakes up for the next time.
1236          */
1237         sta->flags |= WLAN_STA_CLEAR_PS_FILT;
1238
1239         /*
1240          * This code races in the following way:
1241          *
1242          *  (1) STA sends frame indicating it will go to sleep and does so
1243          *  (2) hardware/firmware adds STA to filter list, passes frame up
1244          *  (3) hardware/firmware processes TX fifo and suppresses a frame
1245          *  (4) we get TX status before having processed the frame and
1246          *      knowing that the STA has gone to sleep.
1247          *
1248          * This is actually quite unlikely even when both those events are
1249          * processed from interrupts coming in quickly after one another or
1250          * even at the same time because we queue both TX status events and
1251          * RX frames to be processed by a tasklet and process them in the
1252          * same order that they were received or TX status last. Hence, there
1253          * is no race as long as the frame RX is processed before the next TX
1254          * status, which drivers can ensure, see below.
1255          *
1256          * Note that this can only happen if the hardware or firmware can
1257          * actually add STAs to the filter list, if this is done by the
1258          * driver in response to set_tim() (which will only reduce the race
1259          * this whole filtering tries to solve, not completely solve it)
1260          * this situation cannot happen.
1261          *
1262          * To completely solve this race drivers need to make sure that they
1263          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
1264          *      functions and
1265          *  (b) always process RX events before TX status events if ordering
1266          *      can be unknown, for example with different interrupt status
1267          *      bits.
1268          */
1269         if (sta->flags & WLAN_STA_PS &&
1270             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
1271                 ieee80211_remove_tx_extra(local, sta->key, skb,
1272                                           &status->control);
1273                 skb_queue_tail(&sta->tx_filtered, skb);
1274                 return;
1275         }
1276
1277         if (!(sta->flags & WLAN_STA_PS) &&
1278             !(status->control.flags & IEEE80211_TXCTL_REQUEUE)) {
1279                 /* Software retry the packet once */
1280                 status->control.flags |= IEEE80211_TXCTL_REQUEUE;
1281                 ieee80211_remove_tx_extra(local, sta->key, skb,
1282                                           &status->control);
1283                 dev_queue_xmit(skb);
1284                 return;
1285         }
1286
1287         if (net_ratelimit())
1288                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
1289                        "queue_len=%d PS=%d @%lu\n",
1290                        wiphy_name(local->hw.wiphy),
1291                        skb_queue_len(&sta->tx_filtered),
1292                        !!(sta->flags & WLAN_STA_PS), jiffies);
1293         dev_kfree_skb(skb);
1294 }
1295
1296 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
1297                          struct ieee80211_tx_status *status)
1298 {
1299         struct sk_buff *skb2;
1300         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1301         struct ieee80211_local *local = hw_to_local(hw);
1302         u16 frag, type;
1303         struct ieee80211_tx_status_rtap_hdr *rthdr;
1304         struct ieee80211_sub_if_data *sdata;
1305         struct net_device *prev_dev = NULL;
1306
1307         if (!status) {
1308                 printk(KERN_ERR
1309                        "%s: ieee80211_tx_status called with NULL status\n",
1310                        wiphy_name(local->hw.wiphy));
1311                 dev_kfree_skb(skb);
1312                 return;
1313         }
1314
1315         if (status->excessive_retries) {
1316                 struct sta_info *sta;
1317                 sta = sta_info_get(local, hdr->addr1);
1318                 if (sta) {
1319                         if (sta->flags & WLAN_STA_PS) {
1320                                 /*
1321                                  * The STA is in power save mode, so assume
1322                                  * that this TX packet failed because of that.
1323                                  */
1324                                 status->excessive_retries = 0;
1325                                 status->flags |= IEEE80211_TX_STATUS_TX_FILTERED;
1326                                 ieee80211_handle_filtered_frame(local, sta,
1327                                                                 skb, status);
1328                                 sta_info_put(sta);
1329                                 return;
1330                         }
1331                         sta_info_put(sta);
1332                 }
1333         }
1334
1335         if (status->flags & IEEE80211_TX_STATUS_TX_FILTERED) {
1336                 struct sta_info *sta;
1337                 sta = sta_info_get(local, hdr->addr1);
1338                 if (sta) {
1339                         ieee80211_handle_filtered_frame(local, sta, skb,
1340                                                         status);
1341                         sta_info_put(sta);
1342                         return;
1343                 }
1344         } else
1345                 rate_control_tx_status(local->mdev, skb, status);
1346
1347         ieee80211_led_tx(local, 0);
1348
1349         /* SNMP counters
1350          * Fragments are passed to low-level drivers as separate skbs, so these
1351          * are actually fragments, not frames. Update frame counters only for
1352          * the first fragment of the frame. */
1353
1354         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
1355         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
1356
1357         if (status->flags & IEEE80211_TX_STATUS_ACK) {
1358                 if (frag == 0) {
1359                         local->dot11TransmittedFrameCount++;
1360                         if (is_multicast_ether_addr(hdr->addr1))
1361                                 local->dot11MulticastTransmittedFrameCount++;
1362                         if (status->retry_count > 0)
1363                                 local->dot11RetryCount++;
1364                         if (status->retry_count > 1)
1365                                 local->dot11MultipleRetryCount++;
1366                 }
1367
1368                 /* This counter shall be incremented for an acknowledged MPDU
1369                  * with an individual address in the address 1 field or an MPDU
1370                  * with a multicast address in the address 1 field of type Data
1371                  * or Management. */
1372                 if (!is_multicast_ether_addr(hdr->addr1) ||
1373                     type == IEEE80211_FTYPE_DATA ||
1374                     type == IEEE80211_FTYPE_MGMT)
1375                         local->dot11TransmittedFragmentCount++;
1376         } else {
1377                 if (frag == 0)
1378                         local->dot11FailedCount++;
1379         }
1380
1381         /* this was a transmitted frame, but now we want to reuse it */
1382         skb_orphan(skb);
1383
1384         /*
1385          * This is a bit racy but we can avoid a lot of work
1386          * with this test...
1387          */
1388         if (!local->monitors && !local->cooked_mntrs) {
1389                 dev_kfree_skb(skb);
1390                 return;
1391         }
1392
1393         /* send frame to monitor interfaces now */
1394
1395         if (skb_headroom(skb) < sizeof(*rthdr)) {
1396                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
1397                 dev_kfree_skb(skb);
1398                 return;
1399         }
1400
1401         rthdr = (struct ieee80211_tx_status_rtap_hdr*)
1402                                 skb_push(skb, sizeof(*rthdr));
1403
1404         memset(rthdr, 0, sizeof(*rthdr));
1405         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1406         rthdr->hdr.it_present =
1407                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
1408                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
1409
1410         if (!(status->flags & IEEE80211_TX_STATUS_ACK) &&
1411             !is_multicast_ether_addr(hdr->addr1))
1412                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
1413
1414         if ((status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) &&
1415             (status->control.flags & IEEE80211_TXCTL_USE_CTS_PROTECT))
1416                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
1417         else if (status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS)
1418                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
1419
1420         rthdr->data_retries = status->retry_count;
1421
1422         /* XXX: is this sufficient for BPF? */
1423         skb_set_mac_header(skb, 0);
1424         skb->ip_summed = CHECKSUM_UNNECESSARY;
1425         skb->pkt_type = PACKET_OTHERHOST;
1426         skb->protocol = htons(ETH_P_802_2);
1427         memset(skb->cb, 0, sizeof(skb->cb));
1428
1429         rcu_read_lock();
1430         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1431                 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) {
1432                         if (!netif_running(sdata->dev))
1433                                 continue;
1434
1435                         if (prev_dev) {
1436                                 skb2 = skb_clone(skb, GFP_ATOMIC);
1437                                 if (skb2) {
1438                                         skb2->dev = prev_dev;
1439                                         netif_rx(skb2);
1440                                 }
1441                         }
1442
1443                         prev_dev = sdata->dev;
1444                 }
1445         }
1446         if (prev_dev) {
1447                 skb->dev = prev_dev;
1448                 netif_rx(skb);
1449                 skb = NULL;
1450         }
1451         rcu_read_unlock();
1452         dev_kfree_skb(skb);
1453 }
1454 EXPORT_SYMBOL(ieee80211_tx_status);
1455
1456 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1457                                         const struct ieee80211_ops *ops)
1458 {
1459         struct ieee80211_local *local;
1460         int priv_size;
1461         struct wiphy *wiphy;
1462
1463         /* Ensure 32-byte alignment of our private data and hw private data.
1464          * We use the wiphy priv data for both our ieee80211_local and for
1465          * the driver's private data
1466          *
1467          * In memory it'll be like this:
1468          *
1469          * +-------------------------+
1470          * | struct wiphy           |
1471          * +-------------------------+
1472          * | struct ieee80211_local  |
1473          * +-------------------------+
1474          * | driver's private data   |
1475          * +-------------------------+
1476          *
1477          */
1478         priv_size = ((sizeof(struct ieee80211_local) +
1479                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
1480                     priv_data_len;
1481
1482         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
1483
1484         if (!wiphy)
1485                 return NULL;
1486
1487         wiphy->privid = mac80211_wiphy_privid;
1488
1489         local = wiphy_priv(wiphy);
1490         local->hw.wiphy = wiphy;
1491
1492         local->hw.priv = (char *)local +
1493                          ((sizeof(struct ieee80211_local) +
1494                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
1495
1496         BUG_ON(!ops->tx);
1497         BUG_ON(!ops->start);
1498         BUG_ON(!ops->stop);
1499         BUG_ON(!ops->config);
1500         BUG_ON(!ops->add_interface);
1501         BUG_ON(!ops->remove_interface);
1502         BUG_ON(!ops->configure_filter);
1503         local->ops = ops;
1504
1505         local->hw.queues = 1; /* default */
1506
1507         local->bridge_packets = 1;
1508
1509         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
1510         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1511         local->short_retry_limit = 7;
1512         local->long_retry_limit = 4;
1513         local->hw.conf.radio_enabled = 1;
1514
1515         INIT_LIST_HEAD(&local->interfaces);
1516
1517         INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1518
1519         sta_info_init(local);
1520
1521         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1522                      (unsigned long)local);
1523         tasklet_disable(&local->tx_pending_tasklet);
1524
1525         tasklet_init(&local->tasklet,
1526                      ieee80211_tasklet_handler,
1527                      (unsigned long) local);
1528         tasklet_disable(&local->tasklet);
1529
1530         skb_queue_head_init(&local->skb_queue);
1531         skb_queue_head_init(&local->skb_queue_unreliable);
1532
1533         return local_to_hw(local);
1534 }
1535 EXPORT_SYMBOL(ieee80211_alloc_hw);
1536
1537 int ieee80211_register_hw(struct ieee80211_hw *hw)
1538 {
1539         struct ieee80211_local *local = hw_to_local(hw);
1540         const char *name;
1541         int result;
1542         enum ieee80211_band band;
1543         struct net_device *mdev;
1544         struct ieee80211_sub_if_data *sdata;
1545
1546         /*
1547          * generic code guarantees at least one band,
1548          * set this very early because much code assumes
1549          * that hw.conf.channel is assigned
1550          */
1551         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1552                 struct ieee80211_supported_band *sband;
1553
1554                 sband = local->hw.wiphy->bands[band];
1555                 if (sband) {
1556                         /* init channel we're on */
1557                         local->hw.conf.channel =
1558                         local->oper_channel =
1559                         local->scan_channel = &sband->channels[0];
1560                         break;
1561                 }
1562         }
1563
1564         result = wiphy_register(local->hw.wiphy);
1565         if (result < 0)
1566                 return result;
1567
1568         /* for now, mdev needs sub_if_data :/ */
1569         mdev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
1570                             "wmaster%d", ether_setup);
1571         if (!mdev)
1572                 goto fail_mdev_alloc;
1573
1574         sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
1575         mdev->ieee80211_ptr = &sdata->wdev;
1576         sdata->wdev.wiphy = local->hw.wiphy;
1577
1578         local->mdev = mdev;
1579
1580         ieee80211_rx_bss_list_init(mdev);
1581
1582         mdev->hard_start_xmit = ieee80211_master_start_xmit;
1583         mdev->open = ieee80211_master_open;
1584         mdev->stop = ieee80211_master_stop;
1585         mdev->type = ARPHRD_IEEE80211;
1586         mdev->header_ops = &ieee80211_header_ops;
1587         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
1588
1589         sdata->vif.type = IEEE80211_IF_TYPE_AP;
1590         sdata->dev = mdev;
1591         sdata->local = local;
1592         sdata->u.ap.force_unicast_rateidx = -1;
1593         sdata->u.ap.max_ratectrl_rateidx = -1;
1594         ieee80211_if_sdata_init(sdata);
1595
1596         /* no RCU needed since we're still during init phase */
1597         list_add_tail(&sdata->list, &local->interfaces);
1598
1599         name = wiphy_dev(local->hw.wiphy)->driver->name;
1600         local->hw.workqueue = create_singlethread_workqueue(name);
1601         if (!local->hw.workqueue) {
1602                 result = -ENOMEM;
1603                 goto fail_workqueue;
1604         }
1605
1606         /*
1607          * The hardware needs headroom for sending the frame,
1608          * and we need some headroom for passing the frame to monitor
1609          * interfaces, but never both at the same time.
1610          */
1611         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1612                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
1613
1614         debugfs_hw_add(local);
1615
1616         local->hw.conf.beacon_int = 1000;
1617
1618         local->wstats_flags |= local->hw.max_rssi ?
1619                                IW_QUAL_LEVEL_UPDATED : IW_QUAL_LEVEL_INVALID;
1620         local->wstats_flags |= local->hw.max_signal ?
1621                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1622         local->wstats_flags |= local->hw.max_noise ?
1623                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1624         if (local->hw.max_rssi < 0 || local->hw.max_noise < 0)
1625                 local->wstats_flags |= IW_QUAL_DBM;
1626
1627         result = sta_info_start(local);
1628         if (result < 0)
1629                 goto fail_sta_info;
1630
1631         rtnl_lock();
1632         result = dev_alloc_name(local->mdev, local->mdev->name);
1633         if (result < 0)
1634                 goto fail_dev;
1635
1636         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1637         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1638
1639         result = register_netdevice(local->mdev);
1640         if (result < 0)
1641                 goto fail_dev;
1642
1643         ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1644         ieee80211_if_set_type(local->mdev, IEEE80211_IF_TYPE_AP);
1645
1646         result = ieee80211_init_rate_ctrl_alg(local,
1647                                               hw->rate_control_algorithm);
1648         if (result < 0) {
1649                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1650                        "algorithm\n", wiphy_name(local->hw.wiphy));
1651                 goto fail_rate;
1652         }
1653
1654         result = ieee80211_wep_init(local);
1655
1656         if (result < 0) {
1657                 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1658                        wiphy_name(local->hw.wiphy));
1659                 goto fail_wep;
1660         }
1661
1662         ieee80211_install_qdisc(local->mdev);
1663
1664         /* add one default STA interface */
1665         result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
1666                                   IEEE80211_IF_TYPE_STA);
1667         if (result)
1668                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1669                        wiphy_name(local->hw.wiphy));
1670
1671         local->reg_state = IEEE80211_DEV_REGISTERED;
1672         rtnl_unlock();
1673
1674         ieee80211_led_init(local);
1675
1676         return 0;
1677
1678 fail_wep:
1679         rate_control_deinitialize(local);
1680 fail_rate:
1681         ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1682         unregister_netdevice(local->mdev);
1683 fail_dev:
1684         rtnl_unlock();
1685         sta_info_stop(local);
1686 fail_sta_info:
1687         debugfs_hw_del(local);
1688         destroy_workqueue(local->hw.workqueue);
1689 fail_workqueue:
1690         ieee80211_if_free(local->mdev);
1691         local->mdev = NULL;
1692 fail_mdev_alloc:
1693         wiphy_unregister(local->hw.wiphy);
1694         return result;
1695 }
1696 EXPORT_SYMBOL(ieee80211_register_hw);
1697
1698 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1699 {
1700         struct ieee80211_local *local = hw_to_local(hw);
1701         struct ieee80211_sub_if_data *sdata, *tmp;
1702
1703         tasklet_kill(&local->tx_pending_tasklet);
1704         tasklet_kill(&local->tasklet);
1705
1706         rtnl_lock();
1707
1708         BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
1709
1710         local->reg_state = IEEE80211_DEV_UNREGISTERED;
1711
1712         /*
1713          * At this point, interface list manipulations are fine
1714          * because the driver cannot be handing us frames any
1715          * more and the tasklet is killed.
1716          */
1717
1718         /*
1719          * First, we remove all non-master interfaces. Do this because they
1720          * may have bss pointer dependency on the master, and when we free
1721          * the master these would be freed as well, breaking our list
1722          * iteration completely.
1723          */
1724         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1725                 if (sdata->dev == local->mdev)
1726                         continue;
1727                 list_del(&sdata->list);
1728                 __ieee80211_if_del(local, sdata);
1729         }
1730
1731         /* then, finally, remove the master interface */
1732         __ieee80211_if_del(local, IEEE80211_DEV_TO_SUB_IF(local->mdev));
1733
1734         rtnl_unlock();
1735
1736         ieee80211_rx_bss_list_deinit(local->mdev);
1737         ieee80211_clear_tx_pending(local);
1738         sta_info_stop(local);
1739         rate_control_deinitialize(local);
1740         debugfs_hw_del(local);
1741
1742         if (skb_queue_len(&local->skb_queue)
1743                         || skb_queue_len(&local->skb_queue_unreliable))
1744                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1745                        wiphy_name(local->hw.wiphy));
1746         skb_queue_purge(&local->skb_queue);
1747         skb_queue_purge(&local->skb_queue_unreliable);
1748
1749         destroy_workqueue(local->hw.workqueue);
1750         wiphy_unregister(local->hw.wiphy);
1751         ieee80211_wep_free(local);
1752         ieee80211_led_exit(local);
1753         ieee80211_if_free(local->mdev);
1754         local->mdev = NULL;
1755 }
1756 EXPORT_SYMBOL(ieee80211_unregister_hw);
1757
1758 void ieee80211_free_hw(struct ieee80211_hw *hw)
1759 {
1760         struct ieee80211_local *local = hw_to_local(hw);
1761
1762         wiphy_free(local->hw.wiphy);
1763 }
1764 EXPORT_SYMBOL(ieee80211_free_hw);
1765
1766 static int __init ieee80211_init(void)
1767 {
1768         struct sk_buff *skb;
1769         int ret;
1770
1771         BUILD_BUG_ON(sizeof(struct ieee80211_tx_packet_data) > sizeof(skb->cb));
1772
1773         ret = rc80211_simple_init();
1774         if (ret)
1775                 goto out;
1776
1777         ret = rc80211_pid_init();
1778         if (ret)
1779                 goto out_cleanup_simple;
1780
1781         ret = ieee80211_wme_register();
1782         if (ret) {
1783                 printk(KERN_DEBUG "ieee80211_init: failed to "
1784                        "initialize WME (err=%d)\n", ret);
1785                 goto out_cleanup_pid;
1786         }
1787
1788         ieee80211_debugfs_netdev_init();
1789
1790         return 0;
1791
1792  out_cleanup_pid:
1793         rc80211_pid_exit();
1794  out_cleanup_simple:
1795         rc80211_simple_exit();
1796  out:
1797         return ret;
1798 }
1799
1800 static void __exit ieee80211_exit(void)
1801 {
1802         rc80211_simple_exit();
1803         rc80211_pid_exit();
1804
1805         ieee80211_wme_unregister();
1806         ieee80211_debugfs_netdev_exit();
1807 }
1808
1809
1810 subsys_initcall(ieee80211_init);
1811 module_exit(ieee80211_exit);
1812
1813 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1814 MODULE_LICENSE("GPL");