err.no 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 (sdata->dev != dev && netif_running(sdata->dev)) {
 109                         res = 0;
 110                         break;
 111                 }
 112         }
 113         return res;
 114 }
 115
 116 static int ieee80211_master_stop(struct net_device *dev)
 117 {
 118         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 119         struct ieee80211_sub_if_data *sdata;
 120
 121         /* we hold the RTNL here so can safely walk the list */
 122         list_for_each_entry(sdata, &local->interfaces, list)
 123                 if (sdata->dev != dev && netif_running(sdata->dev))
 124                         dev_close(sdata->dev);
 125
 126         return 0;
 127 }
 128
 129 static void ieee80211_master_set_multicast_list(struct net_device *dev)
 130 {
 131         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 132
 133         ieee80211_configure_filter(local);
 134 }
 135
 136 /* regular interfaces */
 137
 138 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 139 {
 140         int meshhdrlen;
 141         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 142
 143         meshhdrlen = (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) ? 5 : 0;
 144
 145         /* FIX: what would be proper limits for MTU?
 146          * This interface uses 802.3 frames. */
 147         if (new_mtu < 256 ||
 148                 new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
 149                 printk(KERN_WARNING "%s: invalid MTU %d\n",
 150                        dev->name, new_mtu);
 151                 return -EINVAL;
 152         }
 153
 154 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 155         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
 156 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 157         dev->mtu = new_mtu;
 158         return 0;
 159 }
 160
 161 static inline int identical_mac_addr_allowed(int type1, int type2)
 162 {
 163         return (type1 == IEEE80211_IF_TYPE_MNTR ||
 164                 type2 == IEEE80211_IF_TYPE_MNTR ||
 165                 (type1 == IEEE80211_IF_TYPE_AP &&
 166                  type2 == IEEE80211_IF_TYPE_WDS) ||
 167                 (type1 == IEEE80211_IF_TYPE_WDS &&
 168                  (type2 == IEEE80211_IF_TYPE_WDS ||
 169                   type2 == IEEE80211_IF_TYPE_AP)) ||
 170                 (type1 == IEEE80211_IF_TYPE_AP &&
 171                  type2 == IEEE80211_IF_TYPE_VLAN) ||
 172                 (type1 == IEEE80211_IF_TYPE_VLAN &&
 173                  (type2 == IEEE80211_IF_TYPE_AP ||
 174                   type2 == IEEE80211_IF_TYPE_VLAN)));
 175 }
 176
 177 static int ieee80211_open(struct net_device *dev)
 178 {
 179         struct ieee80211_sub_if_data *sdata, *nsdata;
 180         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 181         struct ieee80211_if_init_conf conf;
 182         int res;
 183         bool need_hw_reconfig = 0;
 184         struct sta_info *sta;
 185
 186         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 187
 188         /* we hold the RTNL here so can safely walk the list */
 189         list_for_each_entry(nsdata, &local->interfaces, list) {
 190                 struct net_device *ndev = nsdata->dev;
 191
 192                 if (ndev != dev && ndev != local->mdev && netif_running(ndev)) {
 193                         /*
 194                          * Allow only a single IBSS interface to be up at any
 195                          * time. This is restricted because beacon distribution
 196                          * cannot work properly if both are in the same IBSS.
 197                          *
 198                          * To remove this restriction we'd have to disallow them
 199                          * from setting the same SSID on different IBSS interfaces
 200                          * belonging to the same hardware. Then, however, we're
 201                          * faced with having to adopt two different TSF timers...
 202                          */
 203                         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
 204                             nsdata->vif.type == IEEE80211_IF_TYPE_IBSS)
 205                                 return -EBUSY;
 206
 207                         /*
 208                          * Disallow multiple IBSS/STA mode interfaces.
 209                          *
 210                          * This is a technical restriction, it is possible although
 211                          * most likely not IEEE 802.11 compliant to have multiple
 212                          * STAs with just a single hardware (the TSF timer will not
 213                          * be adjusted properly.)
 214                          *
 215                          * However, because mac80211 uses the master device's BSS
 216                          * information for each STA/IBSS interface, doing this will
 217                          * currently corrupt that BSS information completely, unless,
 218                          * a not very useful case, both STAs are associated to the
 219                          * same BSS.
 220                          *
 221                          * To remove this restriction, the BSS information needs to
 222                          * be embedded in the STA/IBSS mode sdata instead of using
 223                          * the master device's BSS structure.
 224                          */
 225                         if ((sdata->vif.type == IEEE80211_IF_TYPE_STA ||
 226                              sdata->vif.type == IEEE80211_IF_TYPE_IBSS) &&
 227                             (nsdata->vif.type == IEEE80211_IF_TYPE_STA ||
 228                              nsdata->vif.type == IEEE80211_IF_TYPE_IBSS))
 229                                 return -EBUSY;
 230
 231                         /*
 232                          * The remaining checks are only performed for interfaces
 233                          * with the same MAC address.
 234                          */
 235                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 236                                 continue;
 237
 238                         /*
 239                          * check whether it may have the same address
 240                          */
 241                         if (!identical_mac_addr_allowed(sdata->vif.type,
 242                                                         nsdata->vif.type))
 243                                 return -ENOTUNIQ;
 244
 245                         /*
 246                          * can only add VLANs to enabled APs
 247                          */
 248                         if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN &&
 249                             nsdata->vif.type == IEEE80211_IF_TYPE_AP)
 250                                 sdata->u.vlan.ap = nsdata;
 251                 }
 252         }
 253
 254         switch (sdata->vif.type) {
 255         case IEEE80211_IF_TYPE_WDS:
 256                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 257                         return -ENOLINK;
 258                 break;
 259         case IEEE80211_IF_TYPE_VLAN:
 260                 if (!sdata->u.vlan.ap)
 261                         return -ENOLINK;
 262                 break;
 263         case IEEE80211_IF_TYPE_AP:
 264         case IEEE80211_IF_TYPE_STA:
 265         case IEEE80211_IF_TYPE_MNTR:
 266         case IEEE80211_IF_TYPE_IBSS:
 267         case IEEE80211_IF_TYPE_MESH_POINT:
 268                 /* no special treatment */
 269                 break;
 270         case IEEE80211_IF_TYPE_INVALID:
 271                 /* cannot happen */
 272                 WARN_ON(1);
 273                 break;
 274         }
 275
 276         if (local->open_count == 0) {
 277                 res = 0;
 278                 if (local->ops->start)
 279                         res = local->ops->start(local_to_hw(local));
 280                 if (res)
 281                         return res;
 282                 need_hw_reconfig = 1;
 283                 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
 284         }
 285
 286         switch (sdata->vif.type) {
 287         case IEEE80211_IF_TYPE_VLAN:
 288                 list_add(&sdata->u.vlan.list, &sdata->u.vlan.ap->u.ap.vlans);
 289                 /* no need to tell driver */
 290                 break;
 291         case IEEE80211_IF_TYPE_MNTR:
 292                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 293                         local->cooked_mntrs++;
 294                         break;
 295                 }
 296
 297                 /* must be before the call to ieee80211_configure_filter */
 298                 local->monitors++;
 299                 if (local->monitors == 1)
 300                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 301
 302                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 303                         local->fif_fcsfail++;
 304                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 305                         local->fif_plcpfail++;
 306                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 307                         local->fif_control++;
 308                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 309                         local->fif_other_bss++;
 310
 311                 netif_tx_lock_bh(local->mdev);
 312                 ieee80211_configure_filter(local);
 313                 netif_tx_unlock_bh(local->mdev);
 314                 break;
 315         case IEEE80211_IF_TYPE_STA:
 316         case IEEE80211_IF_TYPE_IBSS:
 317                 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
 318                 /* fall through */
 319         default:
 320                 conf.vif = &sdata->vif;
 321                 conf.type = sdata->vif.type;
 322                 conf.mac_addr = dev->dev_addr;
 323                 res = local->ops->add_interface(local_to_hw(local), &conf);
 324                 if (res)
 325                         goto err_stop;
 326
 327                 ieee80211_if_config(dev);
 328                 ieee80211_reset_erp_info(dev);
 329                 ieee80211_enable_keys(sdata);
 330
 331                 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
 332                     !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
 333                         netif_carrier_off(dev);
 334                 else
 335                         netif_carrier_on(dev);
 336         }
 337
 338         if (sdata->vif.type == IEEE80211_IF_TYPE_WDS) {
 339                 /* Create STA entry for the WDS peer */
 340                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 341                                      GFP_KERNEL);
 342                 if (!sta) {
 343                         res = -ENOMEM;
 344                         goto err_del_interface;
 345                 }
 346
 347                 /* no locking required since STA is not live yet */
 348                 sta->flags |= WLAN_STA_AUTHORIZED;
 349
 350                 res = sta_info_insert(sta);
 351                 if (res) {
 352                         /* STA has been freed */
 353                         goto err_del_interface;
 354                 }
 355         }
 356
 357         if (local->open_count == 0) {
 358                 res = dev_open(local->mdev);
 359                 WARN_ON(res);
 360                 if (res)
 361                         goto err_del_interface;
 362                 tasklet_enable(&local->tx_pending_tasklet);
 363                 tasklet_enable(&local->tasklet);
 364         }
 365
 366         /*
 367          * set_multicast_list will be invoked by the networking core
 368          * which will check whether any increments here were done in
 369          * error and sync them down to the hardware as filter flags.
 370          */
 371         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 372                 atomic_inc(&local->iff_allmultis);
 373
 374         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 375                 atomic_inc(&local->iff_promiscs);
 376
 377         local->open_count++;
 378         if (need_hw_reconfig)
 379                 ieee80211_hw_config(local);
 380
 381         /*
 382          * ieee80211_sta_work is disabled while network interface
 383          * is down. Therefore, some configuration changes may not
 384          * yet be effective. Trigger execution of ieee80211_sta_work
 385          * to fix this.
 386          */
 387         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
 388             sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
 389                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 390                 queue_work(local->hw.workqueue, &ifsta->work);
 391         }
 392
 393         netif_start_queue(dev);
 394
 395         return 0;
 396  err_del_interface:
 397         local->ops->remove_interface(local_to_hw(local), &conf);
 398  err_stop:
 399         if (!local->open_count && local->ops->stop)
 400                 local->ops->stop(local_to_hw(local));
 401         return res;
 402 }
 403
 404 static int ieee80211_stop(struct net_device *dev)
 405 {
 406         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 407         struct ieee80211_local *local = sdata->local;
 408         struct ieee80211_if_init_conf conf;
 409         struct sta_info *sta;
 410
 411         /*
 412          * Stop TX on this interface first.
 413          */
 414         netif_stop_queue(dev);
 415
 416         /*
 417          * Now delete all active aggregation sessions.
 418          */
 419         rcu_read_lock();
 420
 421         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 422                 if (sta->sdata == sdata)
 423                         ieee80211_sta_tear_down_BA_sessions(dev, sta->addr);
 424         }
 425
 426         rcu_read_unlock();
 427
 428         /*
 429          * Remove all stations associated with this interface.
 430          *
 431          * This must be done before calling ops->remove_interface()
 432          * because otherwise we can later invoke ops->sta_notify()
 433          * whenever the STAs are removed, and that invalidates driver
 434          * assumptions about always getting a vif pointer that is valid
 435          * (because if we remove a STA after ops->remove_interface()
 436          * the driver will have removed the vif info already!)
 437          *
 438          * We could relax this and only unlink the stations from the
 439          * hash table and list but keep them on a per-sdata list that
 440          * will be inserted back again when the interface is brought
 441          * up again, but I don't currently see a use case for that,
 442          * except with WDS which gets a STA entry created when it is
 443          * brought up.
 444          */
 445         sta_info_flush(local, sdata);
 446
 447         /*
 448          * Don't count this interface for promisc/allmulti while it
 449          * is down. dev_mc_unsync() will invoke set_multicast_list
 450          * on the master interface which will sync these down to the
 451          * hardware as filter flags.
 452          */
 453         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 454                 atomic_dec(&local->iff_allmultis);
 455
 456         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 457                 atomic_dec(&local->iff_promiscs);
 458
 459         dev_mc_unsync(local->mdev, dev);
 460
 461         /* APs need special treatment */
 462         if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
 463                 struct ieee80211_sub_if_data *vlan, *tmp;
 464                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 465
 466                 /* remove beacon */
 467                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 468                 synchronize_rcu();
 469                 kfree(old_beacon);
 470
 471                 /* down all dependent devices, that is VLANs */
 472                 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
 473                                          u.vlan.list)
 474                         dev_close(vlan->dev);
 475                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 476         }
 477
 478         local->open_count--;
 479
 480         switch (sdata->vif.type) {
 481         case IEEE80211_IF_TYPE_VLAN:
 482                 list_del(&sdata->u.vlan.list);
 483                 sdata->u.vlan.ap = NULL;
 484                 /* no need to tell driver */
 485                 break;
 486         case IEEE80211_IF_TYPE_MNTR:
 487                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 488                         local->cooked_mntrs--;
 489                         break;
 490                 }
 491
 492                 local->monitors--;
 493                 if (local->monitors == 0)
 494                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
 495
 496                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 497                         local->fif_fcsfail--;
 498                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 499                         local->fif_plcpfail--;
 500                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 501                         local->fif_control--;
 502                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 503                         local->fif_other_bss--;
 504
 505                 netif_tx_lock_bh(local->mdev);
 506                 ieee80211_configure_filter(local);
 507                 netif_tx_unlock_bh(local->mdev);
 508                 break;
 509         case IEEE80211_IF_TYPE_MESH_POINT:
 510         case IEEE80211_IF_TYPE_STA:
 511         case IEEE80211_IF_TYPE_IBSS:
 512                 sdata->u.sta.state = IEEE80211_DISABLED;
 513                 del_timer_sync(&sdata->u.sta.timer);
 514                 /*
 515                  * When we get here, the interface is marked down.
 516                  * Call synchronize_rcu() to wait for the RX path
 517                  * should it be using the interface and enqueuing
 518                  * frames at this very time on another CPU.
 519                  */
 520                 synchronize_rcu();
 521                 skb_queue_purge(&sdata->u.sta.skb_queue);
 522
 523                 if (local->scan_dev == sdata->dev) {
 524                         if (!local->ops->hw_scan) {
 525                                 local->sta_sw_scanning = 0;
 526                                 cancel_delayed_work(&local->scan_work);
 527                         } else
 528                                 local->sta_hw_scanning = 0;
 529                 }
 530
 531                 flush_workqueue(local->hw.workqueue);
 532
 533                 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
 534                 kfree(sdata->u.sta.extra_ie);
 535                 sdata->u.sta.extra_ie = NULL;
 536                 sdata->u.sta.extra_ie_len = 0;
 537                 /* fall through */
 538         default:
 539                 conf.vif = &sdata->vif;
 540                 conf.type = sdata->vif.type;
 541                 conf.mac_addr = dev->dev_addr;
 542                 /* disable all keys for as long as this netdev is down */
 543                 ieee80211_disable_keys(sdata);
 544                 local->ops->remove_interface(local_to_hw(local), &conf);
 545         }
 546
 547         if (local->open_count == 0) {
 548                 if (netif_running(local->mdev))
 549                         dev_close(local->mdev);
 550
 551                 if (local->ops->stop)
 552                         local->ops->stop(local_to_hw(local));
 553
 554                 ieee80211_led_radio(local, 0);
 555
 556                 tasklet_disable(&local->tx_pending_tasklet);
 557                 tasklet_disable(&local->tasklet);
 558         }
 559
 560         return 0;
 561 }
 562
 563 int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid)
 564 {
 565         struct ieee80211_local *local = hw_to_local(hw);
 566         struct sta_info *sta;
 567         struct ieee80211_sub_if_data *sdata;
 568         u16 start_seq_num = 0;
 569         u8 *state;
 570         int ret;
 571         DECLARE_MAC_BUF(mac);
 572
 573         if (tid >= STA_TID_NUM)
 574                 return -EINVAL;
 575
 576 #ifdef CONFIG_MAC80211_HT_DEBUG
 577         printk(KERN_DEBUG "Open BA session requested for %s tid %u\n",
 578                                 print_mac(mac, ra), tid);
 579 #endif /* CONFIG_MAC80211_HT_DEBUG */
 580
 581         rcu_read_lock();
 582
 583         sta = sta_info_get(local, ra);
 584         if (!sta) {
 585                 printk(KERN_DEBUG "Could not find the station\n");
 586                 rcu_read_unlock();
 587                 return -ENOENT;
 588         }
 589
 590         spin_lock_bh(&sta->lock);
 591
 592         /* we have tried too many times, receiver does not want A-MPDU */
 593         if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
 594                 ret = -EBUSY;
 595                 goto start_ba_exit;
 596         }
 597
 598         state = &sta->ampdu_mlme.tid_state_tx[tid];
 599         /* check if the TID is not in aggregation flow already */
 600         if (*state != HT_AGG_STATE_IDLE) {
 601 #ifdef CONFIG_MAC80211_HT_DEBUG
 602                 printk(KERN_DEBUG "BA request denied - session is not "
 603                                  "idle on tid %u\n", tid);
 604 #endif /* CONFIG_MAC80211_HT_DEBUG */
 605                 ret = -EAGAIN;
 606                 goto start_ba_exit;
 607         }
 608
 609         /* prepare A-MPDU MLME for Tx aggregation */
 610         sta->ampdu_mlme.tid_tx[tid] =
 611                         kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
 612         if (!sta->ampdu_mlme.tid_tx[tid]) {
 613                 if (net_ratelimit())
 614                         printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
 615                                         tid);
 616                 ret = -ENOMEM;
 617                 goto start_ba_exit;
 618         }
 619         /* Tx timer */
 620         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function =
 621                         sta_addba_resp_timer_expired;
 622         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data =
 623                         (unsigned long)&sta->timer_to_tid[tid];
 624         init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
 625
 626         /* ensure that TX flow won't interrupt us
 627          * until the end of the call to requeue function */
 628         spin_lock_bh(&local->mdev->queue_lock);
 629
 630         /* create a new queue for this aggregation */
 631         ret = ieee80211_ht_agg_queue_add(local, sta, tid);
 632
 633         /* case no queue is available to aggregation
 634          * don't switch to aggregation */
 635         if (ret) {
 636 #ifdef CONFIG_MAC80211_HT_DEBUG
 637                 printk(KERN_DEBUG "BA request denied - queue unavailable for"
 638                                         " tid %d\n", tid);
 639 #endif /* CONFIG_MAC80211_HT_DEBUG */
 640                 goto start_ba_err;
 641         }
 642         sdata = sta->sdata;
 643
 644         /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
 645          * call back right away, it must see that the flow has begun */
 646         *state |= HT_ADDBA_REQUESTED_MSK;
 647
 648         if (local->ops->ampdu_action)
 649                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
 650                                                 ra, tid, &start_seq_num);
 651
 652         if (ret) {
 653                 /* No need to requeue the packets in the agg queue, since we
 654                  * held the tx lock: no packet could be enqueued to the newly
 655                  * allocated queue */
 656                  ieee80211_ht_agg_queue_remove(local, sta, tid, 0);
 657 #ifdef CONFIG_MAC80211_HT_DEBUG
 658                 printk(KERN_DEBUG "BA request denied - HW unavailable for"
 659                                         " tid %d\n", tid);
 660 #endif /* CONFIG_MAC80211_HT_DEBUG */
 661                 *state = HT_AGG_STATE_IDLE;
 662                 goto start_ba_err;
 663         }
 664
 665         /* Will put all the packets in the new SW queue */
 666         ieee80211_requeue(local, ieee802_1d_to_ac[tid]);
 667         spin_unlock_bh(&local->mdev->queue_lock);
 668
 669         /* send an addBA request */
 670         sta->ampdu_mlme.dialog_token_allocator++;
 671         sta->ampdu_mlme.tid_tx[tid]->dialog_token =
 672                         sta->ampdu_mlme.dialog_token_allocator;
 673         sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
 674
 675         ieee80211_send_addba_request(sta->sdata->dev, ra, tid,
 676                          sta->ampdu_mlme.tid_tx[tid]->dialog_token,
 677                          sta->ampdu_mlme.tid_tx[tid]->ssn,
 678                          0x40, 5000);
 679
 680         /* activate the timer for the recipient's addBA response */
 681         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
 682                                 jiffies + ADDBA_RESP_INTERVAL;
 683         add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
 684         printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
 685         goto start_ba_exit;
 686
 687 start_ba_err:
 688         kfree(sta->ampdu_mlme.tid_tx[tid]);
 689         sta->ampdu_mlme.tid_tx[tid] = NULL;
 690         spin_unlock_bh(&local->mdev->queue_lock);
 691         ret = -EBUSY;
 692 start_ba_exit:
 693         spin_unlock_bh(&sta->lock);
 694         rcu_read_unlock();
 695         return ret;
 696 }
 697 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
 698
 699 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
 700                                  u8 *ra, u16 tid,
 701                                  enum ieee80211_back_parties initiator)
 702 {
 703         struct ieee80211_local *local = hw_to_local(hw);
 704         struct sta_info *sta;
 705         u8 *state;
 706         int ret = 0;
 707         DECLARE_MAC_BUF(mac);
 708
 709         if (tid >= STA_TID_NUM)
 710                 return -EINVAL;
 711
 712         rcu_read_lock();
 713         sta = sta_info_get(local, ra);
 714         if (!sta) {
 715                 rcu_read_unlock();
 716                 return -ENOENT;
 717         }
 718
 719         /* check if the TID is in aggregation */
 720         state = &sta->ampdu_mlme.tid_state_tx[tid];
 721         spin_lock_bh(&sta->lock);
 722
 723         if (*state != HT_AGG_STATE_OPERATIONAL) {
 724                 ret = -ENOENT;
 725                 goto stop_BA_exit;
 726         }
 727
 728 #ifdef CONFIG_MAC80211_HT_DEBUG
 729         printk(KERN_DEBUG "Tx BA session stop requested for %s tid %u\n",
 730                                 print_mac(mac, ra), tid);
 731 #endif /* CONFIG_MAC80211_HT_DEBUG */
 732
 733         ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]);
 734
 735         *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
 736                 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
 737
 738         if (local->ops->ampdu_action)
 739                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP,
 740                                                 ra, tid, NULL);
 741
 742         /* case HW denied going back to legacy */
 743         if (ret) {
 744                 WARN_ON(ret != -EBUSY);
 745                 *state = HT_AGG_STATE_OPERATIONAL;
 746                 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
 747                 goto stop_BA_exit;
 748         }
 749
 750 stop_BA_exit:
 751         spin_unlock_bh(&sta->lock);
 752         rcu_read_unlock();
 753         return ret;
 754 }
 755 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
 756
 757 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
 758 {
 759         struct ieee80211_local *local = hw_to_local(hw);
 760         struct sta_info *sta;
 761         u8 *state;
 762         DECLARE_MAC_BUF(mac);
 763
 764         if (tid >= STA_TID_NUM) {
 765                 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
 766                                 tid, STA_TID_NUM);
 767                 return;
 768         }
 769
 770         rcu_read_lock();
 771         sta = sta_info_get(local, ra);
 772         if (!sta) {
 773                 rcu_read_unlock();
 774                 printk(KERN_DEBUG "Could not find station: %s\n",
 775                                 print_mac(mac, ra));
 776                 return;
 777         }
 778
 779         state = &sta->ampdu_mlme.tid_state_tx[tid];
 780         spin_lock_bh(&sta->lock);
 781
 782         if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
 783                 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
 784                                 *state);
 785                 spin_unlock_bh(&sta->lock);
 786                 rcu_read_unlock();
 787                 return;
 788         }
 789
 790         WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK);
 791
 792         *state |= HT_ADDBA_DRV_READY_MSK;
 793
 794         if (*state == HT_AGG_STATE_OPERATIONAL) {
 795                 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
 796                 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
 797         }
 798         spin_unlock_bh(&sta->lock);
 799         rcu_read_unlock();
 800 }
 801 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
 802
 803 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
 804 {
 805         struct ieee80211_local *local = hw_to_local(hw);
 806         struct sta_info *sta;
 807         u8 *state;
 808         int agg_queue;
 809         DECLARE_MAC_BUF(mac);
 810
 811         if (tid >= STA_TID_NUM) {
 812                 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
 813                                 tid, STA_TID_NUM);
 814                 return;
 815         }
 816
 817 #ifdef CONFIG_MAC80211_HT_DEBUG
 818         printk(KERN_DEBUG "Stopping Tx BA session for %s tid %d\n",
 819                                 print_mac(mac, ra), tid);
 820 #endif /* CONFIG_MAC80211_HT_DEBUG */
 821
 822         rcu_read_lock();
 823         sta = sta_info_get(local, ra);
 824         if (!sta) {
 825                 printk(KERN_DEBUG "Could not find station: %s\n",
 826                                 print_mac(mac, ra));
 827                 rcu_read_unlock();
 828                 return;
 829         }
 830         state = &sta->ampdu_mlme.tid_state_tx[tid];
 831
 832         spin_lock_bh(&sta->lock);
 833         if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
 834                 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
 835                 spin_unlock_bh(&sta->lock);
 836                 rcu_read_unlock();
 837                 return;
 838         }
 839
 840         if (*state & HT_AGG_STATE_INITIATOR_MSK)
 841                 ieee80211_send_delba(sta->sdata->dev, ra, tid,
 842                         WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
 843
 844         agg_queue = sta->tid_to_tx_q[tid];
 845
 846         /* avoid ordering issues: we are the only one that can modify
 847          * the content of the qdiscs */
 848         spin_lock_bh(&local->mdev->queue_lock);
 849         /* remove the queue for this aggregation */
 850         ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
 851         spin_unlock_bh(&local->mdev->queue_lock);
 852
 853         /* we just requeued the all the frames that were in the removed
 854          * queue, and since we might miss a softirq we do netif_schedule.
 855          * ieee80211_wake_queue is not used here as this queue is not
 856          * necessarily stopped */
 857         netif_schedule(local->mdev);
 858         *state = HT_AGG_STATE_IDLE;
 859         sta->ampdu_mlme.addba_req_num[tid] = 0;
 860         kfree(sta->ampdu_mlme.tid_tx[tid]);
 861         sta->ampdu_mlme.tid_tx[tid] = NULL;
 862         spin_unlock_bh(&sta->lock);
 863
 864         rcu_read_unlock();
 865 }
 866 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
 867
 868 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
 869                                       const u8 *ra, u16 tid)
 870 {
 871         struct ieee80211_local *local = hw_to_local(hw);
 872         struct ieee80211_ra_tid *ra_tid;
 873         struct sk_buff *skb = dev_alloc_skb(0);
 874
 875         if (unlikely(!skb)) {
 876                 if (net_ratelimit())
 877                         printk(KERN_WARNING "%s: Not enough memory, "
 878                                "dropping start BA session", skb->dev->name);
 879                 return;
 880         }
 881         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 882         memcpy(&ra_tid->ra, ra, ETH_ALEN);
 883         ra_tid->tid = tid;
 884
 885         skb->pkt_type = IEEE80211_ADDBA_MSG;
 886         skb_queue_tail(&local->skb_queue, skb);
 887         tasklet_schedule(&local->tasklet);
 888 }
 889 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
 890
 891 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
 892                                      const u8 *ra, u16 tid)
 893 {
 894         struct ieee80211_local *local = hw_to_local(hw);
 895         struct ieee80211_ra_tid *ra_tid;
 896         struct sk_buff *skb = dev_alloc_skb(0);
 897
 898         if (unlikely(!skb)) {
 899                 if (net_ratelimit())
 900                         printk(KERN_WARNING "%s: Not enough memory, "
 901                                "dropping stop BA session", skb->dev->name);
 902                 return;
 903         }
 904         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 905         memcpy(&ra_tid->ra, ra, ETH_ALEN);
 906         ra_tid->tid = tid;
 907
 908         skb->pkt_type = IEEE80211_DELBA_MSG;
 909         skb_queue_tail(&local->skb_queue, skb);
 910         tasklet_schedule(&local->tasklet);
 911 }
 912 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
 913
 914 static void ieee80211_set_multicast_list(struct net_device *dev)
 915 {
 916         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 917         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 918         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 919
 920         allmulti = !!(dev->flags & IFF_ALLMULTI);
 921         promisc = !!(dev->flags & IFF_PROMISC);
 922         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 923         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 924
 925         if (allmulti != sdata_allmulti) {
 926                 if (dev->flags & IFF_ALLMULTI)
 927                         atomic_inc(&local->iff_allmultis);
 928                 else
 929                         atomic_dec(&local->iff_allmultis);
 930                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 931         }
 932
 933         if (promisc != sdata_promisc) {
 934                 if (dev->flags & IFF_PROMISC)
 935                         atomic_inc(&local->iff_promiscs);
 936                 else
 937                         atomic_dec(&local->iff_promiscs);
 938                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 939         }
 940
 941         dev_mc_sync(local->mdev, dev);
 942 }
 943
 944 static const struct header_ops ieee80211_header_ops = {
 945         .create         = eth_header,
 946         .parse          = header_parse_80211,
 947         .rebuild        = eth_rebuild_header,
 948         .cache          = eth_header_cache,
 949         .cache_update   = eth_header_cache_update,
 950 };
 951
 952 /* Must not be called for mdev */
 953 void ieee80211_if_setup(struct net_device *dev)
 954 {
 955         ether_setup(dev);
 956         dev->hard_start_xmit = ieee80211_subif_start_xmit;
 957         dev->wireless_handlers = &ieee80211_iw_handler_def;
 958         dev->set_multicast_list = ieee80211_set_multicast_list;
 959         dev->change_mtu = ieee80211_change_mtu;
 960         dev->open = ieee80211_open;
 961         dev->stop = ieee80211_stop;
 962         dev->destructor = ieee80211_if_free;
 963 }
 964
 965 /* everything else */
 966
 967 static int __ieee80211_if_config(struct net_device *dev,
 968                                  struct sk_buff *beacon,
 969                                  struct ieee80211_tx_control *control)
 970 {
 971         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 972         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 973         struct ieee80211_if_conf conf;
 974
 975         if (!local->ops->config_interface || !netif_running(dev))
 976                 return 0;
 977
 978         memset(&conf, 0, sizeof(conf));
 979         conf.type = sdata->vif.type;
 980         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
 981             sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
 982                 conf.bssid = sdata->u.sta.bssid;
 983                 conf.ssid = sdata->u.sta.ssid;
 984                 conf.ssid_len = sdata->u.sta.ssid_len;
 985         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 986                 conf.beacon = beacon;
 987                 conf.beacon_control = control;
 988                 ieee80211_start_mesh(dev);
 989         } else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
 990                 conf.ssid = sdata->u.ap.ssid;
 991                 conf.ssid_len = sdata->u.ap.ssid_len;
 992                 conf.beacon = beacon;
 993                 conf.beacon_control = control;
 994         }
 995         return local->ops->config_interface(local_to_hw(local),
 996                                             &sdata->vif, &conf);
 997 }
 998
 999 int ieee80211_if_config(struct net_device *dev)
1000 {
1001         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1002         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1003         if (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT &&
1004             (local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
1005                 return ieee80211_if_config_beacon(dev);
1006         return __ieee80211_if_config(dev, NULL, NULL);
1007 }
1008
1009 int ieee80211_if_config_beacon(struct net_device *dev)
1010 {
1011         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1012         struct ieee80211_tx_control control;
1013         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1014         struct sk_buff *skb;
1015
1016         if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
1017                 return 0;
1018         skb = ieee80211_beacon_get(local_to_hw(local), &sdata->vif,
1019                                    &control);
1020         if (!skb)
1021                 return -ENOMEM;
1022         return __ieee80211_if_config(dev, skb, &control);
1023 }
1024
1025 int ieee80211_hw_config(struct ieee80211_local *local)
1026 {
1027         struct ieee80211_channel *chan;
1028         int ret = 0;
1029
1030         if (local->sta_sw_scanning)
1031                 chan = local->scan_channel;
1032         else
1033                 chan = local->oper_channel;
1034
1035         local->hw.conf.channel = chan;
1036
1037         if (!local->hw.conf.power_level)
1038                 local->hw.conf.power_level = chan->max_power;
1039         else
1040                 local->hw.conf.power_level = min(chan->max_power,
1041                                                local->hw.conf.power_level);
1042
1043         local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
1044
1045 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1046         printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
1047                wiphy_name(local->hw.wiphy), chan->center_freq);
1048 #endif
1049
1050         if (local->open_count)
1051                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
1052
1053         return ret;
1054 }
1055
1056 /**
1057  * ieee80211_handle_ht should be used only after legacy configuration
1058  * has been determined namely band, as ht configuration depends upon
1059  * the hardware's HT abilities for a _specific_ band.
1060  */
1061 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
1062                            struct ieee80211_ht_info *req_ht_cap,
1063                            struct ieee80211_ht_bss_info *req_bss_cap)
1064 {
1065         struct ieee80211_conf *conf = &local->hw.conf;
1066         struct ieee80211_supported_band *sband;
1067         struct ieee80211_ht_info ht_conf;
1068         struct ieee80211_ht_bss_info ht_bss_conf;
1069         u32 changed = 0;
1070         int i;
1071         u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS;
1072         u8 tx_mcs_set_cap;
1073
1074         sband = local->hw.wiphy->bands[conf->channel->band];
1075
1076         memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
1077         memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
1078
1079         /* HT is not supported */
1080         if (!sband->ht_info.ht_supported) {
1081                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1082                 goto out;
1083         }
1084
1085         /* disable HT */
1086         if (!enable_ht) {
1087                 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
1088                         changed |= BSS_CHANGED_HT;
1089                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1090                 conf->ht_conf.ht_supported = 0;
1091                 goto out;
1092         }
1093
1094
1095         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
1096                 changed |= BSS_CHANGED_HT;
1097
1098         conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
1099         ht_conf.ht_supported = 1;
1100
1101         ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
1102         ht_conf.cap &= ~(IEEE80211_HT_CAP_MIMO_PS);
1103         ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_MIMO_PS;
1104         ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
1105         ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
1106         ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
1107
1108         ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
1109         ht_conf.ampdu_density = req_ht_cap->ampdu_density;
1110
1111         /* Bits 96-100 */
1112         tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12];
1113
1114         /* configure suppoerted Tx MCS according to requested MCS
1115          * (based in most cases on Rx capabilities of peer) and self
1116          * Tx MCS capabilities (as defined by low level driver HW
1117          * Tx capabilities) */
1118         if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED))
1119                 goto check_changed;
1120
1121         /* Counting from 0 therfore + 1 */
1122         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF)
1123                 max_tx_streams = ((tx_mcs_set_cap &
1124                                 IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1;
1125
1126         for (i = 0; i < max_tx_streams; i++)
1127                 ht_conf.supp_mcs_set[i] =
1128                         sband->ht_info.supp_mcs_set[i] &
1129                                         req_ht_cap->supp_mcs_set[i];
1130
1131         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM)
1132                 for (i = IEEE80211_SUPP_MCS_SET_UEQM;
1133                      i < IEEE80211_SUPP_MCS_SET_LEN; 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 check_changed:
1139         /* if bss configuration changed store the new one */
1140         if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
1141             memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
1142                 changed |= BSS_CHANGED_HT;
1143                 memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
1144                 memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
1145         }
1146 out:
1147         return changed;
1148 }
1149
1150 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1151                                       u32 changed)
1152 {
1153         struct ieee80211_local *local = sdata->local;
1154
1155         if (!changed)
1156                 return;
1157
1158         if (local->ops->bss_info_changed)
1159                 local->ops->bss_info_changed(local_to_hw(local),
1160                                              &sdata->vif,
1161                                              &sdata->bss_conf,
1162                                              changed);
1163 }
1164
1165 void ieee80211_reset_erp_info(struct net_device *dev)
1166 {
1167         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1168
1169         sdata->bss_conf.use_cts_prot = 0;
1170         sdata->bss_conf.use_short_preamble = 0;
1171         ieee80211_bss_info_change_notify(sdata,
1172                                          BSS_CHANGED_ERP_CTS_PROT |
1173                                          BSS_CHANGED_ERP_PREAMBLE);
1174 }
1175
1176 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
1177                                  struct sk_buff *skb,
1178                                  struct ieee80211_tx_status *status)
1179 {
1180         struct ieee80211_local *local = hw_to_local(hw);
1181         struct ieee80211_tx_status *saved;
1182         int tmp;
1183
1184         skb->dev = local->mdev;
1185         saved = kmalloc(sizeof(struct ieee80211_tx_status), GFP_ATOMIC);
1186         if (unlikely(!saved)) {
1187                 if (net_ratelimit())
1188                         printk(KERN_WARNING "%s: Not enough memory, "
1189                                "dropping tx status", skb->dev->name);
1190                 /* should be dev_kfree_skb_irq, but due to this function being
1191                  * named _irqsafe instead of just _irq we can't be sure that
1192                  * people won't call it from non-irq contexts */
1193                 dev_kfree_skb_any(skb);
1194                 return;
1195         }
1196         memcpy(saved, status, sizeof(struct ieee80211_tx_status));
1197         /* copy pointer to saved status into skb->cb for use by tasklet */
1198         memcpy(skb->cb, &saved, sizeof(saved));
1199
1200         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
1201         skb_queue_tail(status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS ?
1202                        &local->skb_queue : &local->skb_queue_unreliable, skb);
1203         tmp = skb_queue_len(&local->skb_queue) +
1204                 skb_queue_len(&local->skb_queue_unreliable);
1205         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
1206                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1207                 memcpy(&saved, skb->cb, sizeof(saved));
1208                 kfree(saved);
1209                 dev_kfree_skb_irq(skb);
1210                 tmp--;
1211                 I802_DEBUG_INC(local->tx_status_drop);
1212         }
1213         tasklet_schedule(&local->tasklet);
1214 }
1215 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
1216
1217 static void ieee80211_tasklet_handler(unsigned long data)
1218 {
1219         struct ieee80211_local *local = (struct ieee80211_local *) data;
1220         struct sk_buff *skb;
1221         struct ieee80211_rx_status rx_status;
1222         struct ieee80211_tx_status *tx_status;
1223         struct ieee80211_ra_tid *ra_tid;
1224
1225         while ((skb = skb_dequeue(&local->skb_queue)) ||
1226                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1227                 switch (skb->pkt_type) {
1228                 case IEEE80211_RX_MSG:
1229                         /* status is in skb->cb */
1230                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
1231                         /* Clear skb->pkt_type in order to not confuse kernel
1232                          * netstack. */
1233                         skb->pkt_type = 0;
1234                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
1235                         break;
1236                 case IEEE80211_TX_STATUS_MSG:
1237                         /* get pointer to saved status out of skb->cb */
1238                         memcpy(&tx_status, skb->cb, sizeof(tx_status));
1239                         skb->pkt_type = 0;
1240                         ieee80211_tx_status(local_to_hw(local),
1241                                             skb, tx_status);
1242                         kfree(tx_status);
1243                         break;
1244                 case IEEE80211_DELBA_MSG:
1245                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1246                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
1247                                                 ra_tid->ra, ra_tid->tid);
1248                         dev_kfree_skb(skb);
1249                         break;
1250                 case IEEE80211_ADDBA_MSG:
1251                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1252                         ieee80211_start_tx_ba_cb(local_to_hw(local),
1253                                                  ra_tid->ra, ra_tid->tid);
1254                         dev_kfree_skb(skb);
1255                         break ;
1256                 default: /* should never get here! */
1257                         printk(KERN_ERR "%s: Unknown message type (%d)\n",
1258                                wiphy_name(local->hw.wiphy), skb->pkt_type);
1259                         dev_kfree_skb(skb);
1260                         break;
1261                 }
1262         }
1263 }
1264
1265 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
1266  * make a prepared TX frame (one that has been given to hw) to look like brand
1267  * new IEEE 802.11 frame that is ready to go through TX processing again.
1268  * Also, tx_packet_data in cb is restored from tx_control. */
1269 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
1270                                       struct ieee80211_key *key,
1271                                       struct sk_buff *skb,
1272                                       struct ieee80211_tx_control *control)
1273 {
1274         int hdrlen, iv_len, mic_len;
1275         struct ieee80211_tx_packet_data *pkt_data;
1276
1277         pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1278         pkt_data->ifindex = vif_to_sdata(control->vif)->dev->ifindex;
1279         pkt_data->flags = 0;
1280         if (control->flags & IEEE80211_TXCTL_REQ_TX_STATUS)
1281                 pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
1282         if (control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT)
1283                 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1284         if (control->flags & IEEE80211_TXCTL_REQUEUE)
1285                 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
1286         if (control->flags & IEEE80211_TXCTL_EAPOL_FRAME)
1287                 pkt_data->flags |= IEEE80211_TXPD_EAPOL_FRAME;
1288         pkt_data->queue = control->queue;
1289
1290         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1291
1292         if (!key)
1293                 goto no_key;
1294
1295         switch (key->conf.alg) {
1296         case ALG_WEP:
1297                 iv_len = WEP_IV_LEN;
1298                 mic_len = WEP_ICV_LEN;
1299                 break;
1300         case ALG_TKIP:
1301                 iv_len = TKIP_IV_LEN;
1302                 mic_len = TKIP_ICV_LEN;
1303                 break;
1304         case ALG_CCMP:
1305                 iv_len = CCMP_HDR_LEN;
1306                 mic_len = CCMP_MIC_LEN;
1307                 break;
1308         default:
1309                 goto no_key;
1310         }
1311
1312         if (skb->len >= mic_len &&
1313             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
1314                 skb_trim(skb, skb->len - mic_len);
1315         if (skb->len >= iv_len && skb->len > hdrlen) {
1316                 memmove(skb->data + iv_len, skb->data, hdrlen);
1317                 skb_pull(skb, iv_len);
1318         }
1319
1320 no_key:
1321         {
1322                 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1323                 u16 fc = le16_to_cpu(hdr->frame_control);
1324                 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
1325                         fc &= ~IEEE80211_STYPE_QOS_DATA;
1326                         hdr->frame_control = cpu_to_le16(fc);
1327                         memmove(skb->data + 2, skb->data, hdrlen - 2);
1328                         skb_pull(skb, 2);
1329                 }
1330         }
1331 }
1332
1333 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
1334                                             struct sta_info *sta,
1335                                             struct sk_buff *skb,
1336                                             struct ieee80211_tx_status *status)
1337 {
1338         sta->tx_filtered_count++;
1339
1340         /*
1341          * Clear the TX filter mask for this STA when sending the next
1342          * packet. If the STA went to power save mode, this will happen
1343          * happen when it wakes up for the next time.
1344          */
1345         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
1346
1347         /*
1348          * This code races in the following way:
1349          *
1350          *  (1) STA sends frame indicating it will go to sleep and does so
1351          *  (2) hardware/firmware adds STA to filter list, passes frame up
1352          *  (3) hardware/firmware processes TX fifo and suppresses a frame
1353          *  (4) we get TX status before having processed the frame and
1354          *      knowing that the STA has gone to sleep.
1355          *
1356          * This is actually quite unlikely even when both those events are
1357          * processed from interrupts coming in quickly after one another or
1358          * even at the same time because we queue both TX status events and
1359          * RX frames to be processed by a tasklet and process them in the
1360          * same order that they were received or TX status last. Hence, there
1361          * is no race as long as the frame RX is processed before the next TX
1362          * status, which drivers can ensure, see below.
1363          *
1364          * Note that this can only happen if the hardware or firmware can
1365          * actually add STAs to the filter list, if this is done by the
1366          * driver in response to set_tim() (which will only reduce the race
1367          * this whole filtering tries to solve, not completely solve it)
1368          * this situation cannot happen.
1369          *
1370          * To completely solve this race drivers need to make sure that they
1371          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
1372          *      functions and
1373          *  (b) always process RX events before TX status events if ordering
1374          *      can be unknown, for example with different interrupt status
1375          *      bits.
1376          */
1377         if (test_sta_flags(sta, WLAN_STA_PS) &&
1378             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
1379                 ieee80211_remove_tx_extra(local, sta->key, skb,
1380                                           &status->control);
1381                 skb_queue_tail(&sta->tx_filtered, skb);
1382                 return;
1383         }
1384
1385         if (!test_sta_flags(sta, WLAN_STA_PS) &&
1386             !(status->control.flags & IEEE80211_TXCTL_REQUEUE)) {
1387                 /* Software retry the packet once */
1388                 status->control.flags |= IEEE80211_TXCTL_REQUEUE;
1389                 ieee80211_remove_tx_extra(local, sta->key, skb,
1390                                           &status->control);
1391                 dev_queue_xmit(skb);
1392                 return;
1393         }
1394
1395         if (net_ratelimit())
1396                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
1397                        "queue_len=%d PS=%d @%lu\n",
1398                        wiphy_name(local->hw.wiphy),
1399                        skb_queue_len(&sta->tx_filtered),
1400                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
1401         dev_kfree_skb(skb);
1402 }
1403
1404 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
1405                          struct ieee80211_tx_status *status)
1406 {
1407         struct sk_buff *skb2;
1408         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1409         struct ieee80211_local *local = hw_to_local(hw);
1410         u16 frag, type;
1411         struct ieee80211_tx_status_rtap_hdr *rthdr;
1412         struct ieee80211_sub_if_data *sdata;
1413         struct net_device *prev_dev = NULL;
1414
1415         if (!status) {
1416                 printk(KERN_ERR
1417                        "%s: ieee80211_tx_status called with NULL status\n",
1418                        wiphy_name(local->hw.wiphy));
1419                 dev_kfree_skb(skb);
1420                 return;
1421         }
1422
1423         rcu_read_lock();
1424
1425         if (status->excessive_retries) {
1426                 struct sta_info *sta;
1427                 sta = sta_info_get(local, hdr->addr1);
1428                 if (sta) {
1429                         if (test_sta_flags(sta, WLAN_STA_PS)) {
1430                                 /*
1431                                  * The STA is in power save mode, so assume
1432                                  * that this TX packet failed because of that.
1433                                  */
1434                                 status->excessive_retries = 0;
1435                                 status->flags |= IEEE80211_TX_STATUS_TX_FILTERED;
1436                                 ieee80211_handle_filtered_frame(local, sta,
1437                                                                 skb, status);
1438                                 rcu_read_unlock();
1439                                 return;
1440                         }
1441                 }
1442         }
1443
1444         if (status->flags & IEEE80211_TX_STATUS_TX_FILTERED) {
1445                 struct sta_info *sta;
1446                 sta = sta_info_get(local, hdr->addr1);
1447                 if (sta) {
1448                         ieee80211_handle_filtered_frame(local, sta, skb,
1449                                                         status);
1450                         rcu_read_unlock();
1451                         return;
1452                 }
1453         } else
1454                 rate_control_tx_status(local->mdev, skb, status);
1455
1456         rcu_read_unlock();
1457
1458         ieee80211_led_tx(local, 0);
1459
1460         /* SNMP counters
1461          * Fragments are passed to low-level drivers as separate skbs, so these
1462          * are actually fragments, not frames. Update frame counters only for
1463          * the first fragment of the frame. */
1464
1465         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
1466         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
1467
1468         if (status->flags & IEEE80211_TX_STATUS_ACK) {
1469                 if (frag == 0) {
1470                         local->dot11TransmittedFrameCount++;
1471                         if (is_multicast_ether_addr(hdr->addr1))
1472                                 local->dot11MulticastTransmittedFrameCount++;
1473                         if (status->retry_count > 0)
1474                                 local->dot11RetryCount++;
1475                         if (status->retry_count > 1)
1476                                 local->dot11MultipleRetryCount++;
1477                 }
1478
1479                 /* This counter shall be incremented for an acknowledged MPDU
1480                  * with an individual address in the address 1 field or an MPDU
1481                  * with a multicast address in the address 1 field of type Data
1482                  * or Management. */
1483                 if (!is_multicast_ether_addr(hdr->addr1) ||
1484                     type == IEEE80211_FTYPE_DATA ||
1485                     type == IEEE80211_FTYPE_MGMT)
1486                         local->dot11TransmittedFragmentCount++;
1487         } else {
1488                 if (frag == 0)
1489                         local->dot11FailedCount++;
1490         }
1491
1492         /* this was a transmitted frame, but now we want to reuse it */
1493         skb_orphan(skb);
1494
1495         /*
1496          * This is a bit racy but we can avoid a lot of work
1497          * with this test...
1498          */
1499         if (!local->monitors && !local->cooked_mntrs) {
1500                 dev_kfree_skb(skb);
1501                 return;
1502         }
1503
1504         /* send frame to monitor interfaces now */
1505
1506         if (skb_headroom(skb) < sizeof(*rthdr)) {
1507                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
1508                 dev_kfree_skb(skb);
1509                 return;
1510         }
1511
1512         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
1513                                 skb_push(skb, sizeof(*rthdr));
1514
1515         memset(rthdr, 0, sizeof(*rthdr));
1516         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1517         rthdr->hdr.it_present =
1518                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
1519                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
1520
1521         if (!(status->flags & IEEE80211_TX_STATUS_ACK) &&
1522             !is_multicast_ether_addr(hdr->addr1))
1523                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
1524
1525         if ((status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) &&
1526             (status->control.flags & IEEE80211_TXCTL_USE_CTS_PROTECT))
1527                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
1528         else if (status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS)
1529                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
1530
1531         rthdr->data_retries = status->retry_count;
1532
1533         /* XXX: is this sufficient for BPF? */
1534         skb_set_mac_header(skb, 0);
1535         skb->ip_summed = CHECKSUM_UNNECESSARY;
1536         skb->pkt_type = PACKET_OTHERHOST;
1537         skb->protocol = htons(ETH_P_802_2);
1538         memset(skb->cb, 0, sizeof(skb->cb));
1539
1540         rcu_read_lock();
1541         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1542                 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) {
1543                         if (!netif_running(sdata->dev))
1544                                 continue;
1545
1546                         if (prev_dev) {
1547                                 skb2 = skb_clone(skb, GFP_ATOMIC);
1548                                 if (skb2) {
1549                                         skb2->dev = prev_dev;
1550                                         netif_rx(skb2);
1551                                 }
1552                         }
1553
1554                         prev_dev = sdata->dev;
1555                 }
1556         }
1557         if (prev_dev) {
1558                 skb->dev = prev_dev;
1559                 netif_rx(skb);
1560                 skb = NULL;
1561         }
1562         rcu_read_unlock();
1563         dev_kfree_skb(skb);
1564 }
1565 EXPORT_SYMBOL(ieee80211_tx_status);
1566
1567 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1568                                         const struct ieee80211_ops *ops)
1569 {
1570         struct ieee80211_local *local;
1571         int priv_size;
1572         struct wiphy *wiphy;
1573
1574         /* Ensure 32-byte alignment of our private data and hw private data.
1575          * We use the wiphy priv data for both our ieee80211_local and for
1576          * the driver's private data
1577          *
1578          * In memory it'll be like this:
1579          *
1580          * +-------------------------+
1581          * | struct wiphy           |
1582          * +-------------------------+
1583          * | struct ieee80211_local  |
1584          * +-------------------------+
1585          * | driver's private data   |
1586          * +-------------------------+
1587          *
1588          */
1589         priv_size = ((sizeof(struct ieee80211_local) +
1590                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
1591                     priv_data_len;
1592
1593         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
1594
1595         if (!wiphy)
1596                 return NULL;
1597
1598         wiphy->privid = mac80211_wiphy_privid;
1599
1600         local = wiphy_priv(wiphy);
1601         local->hw.wiphy = wiphy;
1602
1603         local->hw.priv = (char *)local +
1604                          ((sizeof(struct ieee80211_local) +
1605                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
1606
1607         BUG_ON(!ops->tx);
1608         BUG_ON(!ops->start);
1609         BUG_ON(!ops->stop);
1610         BUG_ON(!ops->config);
1611         BUG_ON(!ops->add_interface);
1612         BUG_ON(!ops->remove_interface);
1613         BUG_ON(!ops->configure_filter);
1614         local->ops = ops;
1615
1616         local->hw.queues = 1; /* default */
1617
1618         local->bridge_packets = 1;
1619
1620         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
1621         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1622         local->short_retry_limit = 7;
1623         local->long_retry_limit = 4;
1624         local->hw.conf.radio_enabled = 1;
1625
1626         INIT_LIST_HEAD(&local->interfaces);
1627
1628         spin_lock_init(&local->key_lock);
1629
1630         INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1631
1632         sta_info_init(local);
1633
1634         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1635                      (unsigned long)local);
1636         tasklet_disable(&local->tx_pending_tasklet);
1637
1638         tasklet_init(&local->tasklet,
1639                      ieee80211_tasklet_handler,
1640                      (unsigned long) local);
1641         tasklet_disable(&local->tasklet);
1642
1643         skb_queue_head_init(&local->skb_queue);
1644         skb_queue_head_init(&local->skb_queue_unreliable);
1645
1646         return local_to_hw(local);
1647 }
1648 EXPORT_SYMBOL(ieee80211_alloc_hw);
1649
1650 int ieee80211_register_hw(struct ieee80211_hw *hw)
1651 {
1652         struct ieee80211_local *local = hw_to_local(hw);
1653         const char *name;
1654         int result;
1655         enum ieee80211_band band;
1656         struct net_device *mdev;
1657         struct ieee80211_sub_if_data *sdata;
1658
1659         /*
1660          * generic code guarantees at least one band,
1661          * set this very early because much code assumes
1662          * that hw.conf.channel is assigned
1663          */
1664         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1665                 struct ieee80211_supported_band *sband;
1666
1667                 sband = local->hw.wiphy->bands[band];
1668                 if (sband) {
1669                         /* init channel we're on */
1670                         local->hw.conf.channel =
1671                         local->oper_channel =
1672                         local->scan_channel = &sband->channels[0];
1673                         break;
1674                 }
1675         }
1676
1677         result = wiphy_register(local->hw.wiphy);
1678         if (result < 0)
1679                 return result;
1680
1681         /* for now, mdev needs sub_if_data :/ */
1682         mdev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
1683                             "wmaster%d", ether_setup);
1684         if (!mdev)
1685                 goto fail_mdev_alloc;
1686
1687         sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
1688         mdev->ieee80211_ptr = &sdata->wdev;
1689         sdata->wdev.wiphy = local->hw.wiphy;
1690
1691         local->mdev = mdev;
1692
1693         ieee80211_rx_bss_list_init(mdev);
1694
1695         mdev->hard_start_xmit = ieee80211_master_start_xmit;
1696         mdev->open = ieee80211_master_open;
1697         mdev->stop = ieee80211_master_stop;
1698         mdev->type = ARPHRD_IEEE80211;
1699         mdev->header_ops = &ieee80211_header_ops;
1700         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
1701
1702         sdata->vif.type = IEEE80211_IF_TYPE_AP;
1703         sdata->dev = mdev;
1704         sdata->local = local;
1705         sdata->u.ap.force_unicast_rateidx = -1;
1706         sdata->u.ap.max_ratectrl_rateidx = -1;
1707         ieee80211_if_sdata_init(sdata);
1708
1709         /* no RCU needed since we're still during init phase */
1710         list_add_tail(&sdata->list, &local->interfaces);
1711
1712         name = wiphy_dev(local->hw.wiphy)->driver->name;
1713         local->hw.workqueue = create_singlethread_workqueue(name);
1714         if (!local->hw.workqueue) {
1715                 result = -ENOMEM;
1716                 goto fail_workqueue;
1717         }
1718
1719         /*
1720          * The hardware needs headroom for sending the frame,
1721          * and we need some headroom for passing the frame to monitor
1722          * interfaces, but never both at the same time.
1723          */
1724         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1725                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
1726
1727         debugfs_hw_add(local);
1728
1729         local->hw.conf.beacon_int = 1000;
1730
1731         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
1732                                                   IEEE80211_HW_SIGNAL_DB |
1733                                                   IEEE80211_HW_SIGNAL_DBM) ?
1734                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1735         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
1736                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1737         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
1738                 local->wstats_flags |= IW_QUAL_DBM;
1739
1740         result = sta_info_start(local);
1741         if (result < 0)
1742                 goto fail_sta_info;
1743
1744         rtnl_lock();
1745         result = dev_alloc_name(local->mdev, local->mdev->name);
1746         if (result < 0)
1747                 goto fail_dev;
1748
1749         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1750         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1751
1752         result = register_netdevice(local->mdev);
1753         if (result < 0)
1754                 goto fail_dev;
1755
1756         ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1757         ieee80211_if_set_type(local->mdev, IEEE80211_IF_TYPE_AP);
1758
1759         result = ieee80211_init_rate_ctrl_alg(local,
1760                                               hw->rate_control_algorithm);
1761         if (result < 0) {
1762                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1763                        "algorithm\n", wiphy_name(local->hw.wiphy));
1764                 goto fail_rate;
1765         }
1766
1767         result = ieee80211_wep_init(local);
1768
1769         if (result < 0) {
1770                 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1771                        wiphy_name(local->hw.wiphy));
1772                 goto fail_wep;
1773         }
1774
1775         if (hw->queues > IEEE80211_MAX_QUEUES)
1776                 hw->queues = IEEE80211_MAX_QUEUES;
1777         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
1778                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
1779
1780         ieee80211_install_qdisc(local->mdev);
1781
1782         /* add one default STA interface */
1783         result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
1784                                   IEEE80211_IF_TYPE_STA, NULL);
1785         if (result)
1786                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1787                        wiphy_name(local->hw.wiphy));
1788
1789         local->reg_state = IEEE80211_DEV_REGISTERED;
1790         rtnl_unlock();
1791
1792         ieee80211_led_init(local);
1793
1794         return 0;
1795
1796 fail_wep:
1797         rate_control_deinitialize(local);
1798 fail_rate:
1799         ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1800         unregister_netdevice(local->mdev);
1801         local->mdev = NULL;
1802 fail_dev:
1803         rtnl_unlock();
1804         sta_info_stop(local);
1805 fail_sta_info:
1806         debugfs_hw_del(local);
1807         destroy_workqueue(local->hw.workqueue);
1808 fail_workqueue:
1809         if (local->mdev != NULL) {
1810                 ieee80211_if_free(local->mdev);
1811                 local->mdev = NULL;
1812         }
1813 fail_mdev_alloc:
1814         wiphy_unregister(local->hw.wiphy);
1815         return result;
1816 }
1817 EXPORT_SYMBOL(ieee80211_register_hw);
1818
1819 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1820 {
1821         struct ieee80211_local *local = hw_to_local(hw);
1822         struct ieee80211_sub_if_data *sdata, *tmp;
1823
1824         tasklet_kill(&local->tx_pending_tasklet);
1825         tasklet_kill(&local->tasklet);
1826
1827         rtnl_lock();
1828
1829         BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
1830
1831         local->reg_state = IEEE80211_DEV_UNREGISTERED;
1832
1833         /*
1834          * At this point, interface list manipulations are fine
1835          * because the driver cannot be handing us frames any
1836          * more and the tasklet is killed.
1837          */
1838
1839         /*
1840          * First, we remove all non-master interfaces. Do this because they
1841          * may have bss pointer dependency on the master, and when we free
1842          * the master these would be freed as well, breaking our list
1843          * iteration completely.
1844          */
1845         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1846                 if (sdata->dev == local->mdev)
1847                         continue;
1848                 list_del(&sdata->list);
1849                 __ieee80211_if_del(local, sdata);
1850         }
1851
1852         /* then, finally, remove the master interface */
1853         __ieee80211_if_del(local, IEEE80211_DEV_TO_SUB_IF(local->mdev));
1854
1855         rtnl_unlock();
1856
1857         ieee80211_rx_bss_list_deinit(local->mdev);
1858         ieee80211_clear_tx_pending(local);
1859         sta_info_stop(local);
1860         rate_control_deinitialize(local);
1861         debugfs_hw_del(local);
1862
1863         if (skb_queue_len(&local->skb_queue)
1864                         || skb_queue_len(&local->skb_queue_unreliable))
1865                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1866                        wiphy_name(local->hw.wiphy));
1867         skb_queue_purge(&local->skb_queue);
1868         skb_queue_purge(&local->skb_queue_unreliable);
1869
1870         destroy_workqueue(local->hw.workqueue);
1871         wiphy_unregister(local->hw.wiphy);
1872         ieee80211_wep_free(local);
1873         ieee80211_led_exit(local);
1874         ieee80211_if_free(local->mdev);
1875         local->mdev = NULL;
1876 }
1877 EXPORT_SYMBOL(ieee80211_unregister_hw);
1878
1879 void ieee80211_free_hw(struct ieee80211_hw *hw)
1880 {
1881         struct ieee80211_local *local = hw_to_local(hw);
1882
1883         wiphy_free(local->hw.wiphy);
1884 }
1885 EXPORT_SYMBOL(ieee80211_free_hw);
1886
1887 static int __init ieee80211_init(void)
1888 {
1889         struct sk_buff *skb;
1890         int ret;
1891
1892         BUILD_BUG_ON(sizeof(struct ieee80211_tx_packet_data) > sizeof(skb->cb));
1893
1894         ret = rc80211_pid_init();
1895         if (ret)
1896                 goto out;
1897
1898         ret = ieee80211_wme_register();
1899         if (ret) {
1900                 printk(KERN_DEBUG "ieee80211_init: failed to "
1901                        "initialize WME (err=%d)\n", ret);
1902                 goto out_cleanup_pid;
1903         }
1904
1905         ieee80211_debugfs_netdev_init();
1906
1907         return 0;
1908
1909  out_cleanup_pid:
1910         rc80211_pid_exit();
1911  out:
1912         return ret;
1913 }
1914
1915 static void __exit ieee80211_exit(void)
1916 {
1917         rc80211_pid_exit();
1918
1919         /*
1920          * For key todo, it'll be empty by now but the work
1921          * might still be scheduled.
1922          */
1923         flush_scheduled_work();
1924
1925         if (mesh_allocated)
1926                 ieee80211s_stop();
1927
1928         ieee80211_wme_unregister();
1929         ieee80211_debugfs_netdev_exit();
1930 }
1931
1932
1933 subsys_initcall(ieee80211_init);
1934 module_exit(ieee80211_exit);
1935
1936 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1937 MODULE_LICENSE("GPL");