SAFE public projects git trees. - safe/jmp/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
 114         if (res)
 115                 return res;
 116
 117         netif_start_queue(local->mdev);
 118
 119         return 0;
 120 }
 121
 122 static int ieee80211_master_stop(struct net_device *dev)
 123 {
 124         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 125         struct ieee80211_sub_if_data *sdata;
 126
 127         /* we hold the RTNL here so can safely walk the list */
 128         list_for_each_entry(sdata, &local->interfaces, list)
 129                 if (sdata->dev != dev && netif_running(sdata->dev))
 130                         dev_close(sdata->dev);
 131
 132         return 0;
 133 }
 134
 135 static void ieee80211_master_set_multicast_list(struct net_device *dev)
 136 {
 137         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 138
 139         ieee80211_configure_filter(local);
 140 }
 141
 142 /* regular interfaces */
 143
 144 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 145 {
 146         int meshhdrlen;
 147         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 148
 149         meshhdrlen = (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) ? 5 : 0;
 150
 151         /* FIX: what would be proper limits for MTU?
 152          * This interface uses 802.3 frames. */
 153         if (new_mtu < 256 ||
 154             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
 155                 return -EINVAL;
 156         }
 157
 158 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 159         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
 160 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 161         dev->mtu = new_mtu;
 162         return 0;
 163 }
 164
 165 static inline int identical_mac_addr_allowed(int type1, int type2)
 166 {
 167         return (type1 == IEEE80211_IF_TYPE_MNTR ||
 168                 type2 == IEEE80211_IF_TYPE_MNTR ||
 169                 (type1 == IEEE80211_IF_TYPE_AP &&
 170                  type2 == IEEE80211_IF_TYPE_WDS) ||
 171                 (type1 == IEEE80211_IF_TYPE_WDS &&
 172                  (type2 == IEEE80211_IF_TYPE_WDS ||
 173                   type2 == IEEE80211_IF_TYPE_AP)) ||
 174                 (type1 == IEEE80211_IF_TYPE_AP &&
 175                  type2 == IEEE80211_IF_TYPE_VLAN) ||
 176                 (type1 == IEEE80211_IF_TYPE_VLAN &&
 177                  (type2 == IEEE80211_IF_TYPE_AP ||
 178                   type2 == IEEE80211_IF_TYPE_VLAN)));
 179 }
 180
 181 static int ieee80211_open(struct net_device *dev)
 182 {
 183         struct ieee80211_sub_if_data *sdata, *nsdata;
 184         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 185         struct sta_info *sta;
 186         struct ieee80211_if_init_conf conf;
 187         u32 changed = 0;
 188         int res;
 189         bool need_hw_reconfig = 0;
 190
 191         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 192
 193         /* we hold the RTNL here so can safely walk the list */
 194         list_for_each_entry(nsdata, &local->interfaces, list) {
 195                 struct net_device *ndev = nsdata->dev;
 196
 197                 if (ndev != dev && ndev != local->mdev && netif_running(ndev)) {
 198                         /*
 199                          * Allow only a single IBSS interface to be up at any
 200                          * time. This is restricted because beacon distribution
 201                          * cannot work properly if both are in the same IBSS.
 202                          *
 203                          * To remove this restriction we'd have to disallow them
 204                          * from setting the same SSID on different IBSS interfaces
 205                          * belonging to the same hardware. Then, however, we're
 206                          * faced with having to adopt two different TSF timers...
 207                          */
 208                         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
 209                             nsdata->vif.type == IEEE80211_IF_TYPE_IBSS)
 210                                 return -EBUSY;
 211
 212                         /*
 213                          * Disallow multiple IBSS/STA mode interfaces.
 214                          *
 215                          * This is a technical restriction, it is possible although
 216                          * most likely not IEEE 802.11 compliant to have multiple
 217                          * STAs with just a single hardware (the TSF timer will not
 218                          * be adjusted properly.)
 219                          *
 220                          * However, because mac80211 uses the master device's BSS
 221                          * information for each STA/IBSS interface, doing this will
 222                          * currently corrupt that BSS information completely, unless,
 223                          * a not very useful case, both STAs are associated to the
 224                          * same BSS.
 225                          *
 226                          * To remove this restriction, the BSS information needs to
 227                          * be embedded in the STA/IBSS mode sdata instead of using
 228                          * the master device's BSS structure.
 229                          */
 230                         if ((sdata->vif.type == IEEE80211_IF_TYPE_STA ||
 231                              sdata->vif.type == IEEE80211_IF_TYPE_IBSS) &&
 232                             (nsdata->vif.type == IEEE80211_IF_TYPE_STA ||
 233                              nsdata->vif.type == IEEE80211_IF_TYPE_IBSS))
 234                                 return -EBUSY;
 235
 236                         /*
 237                          * The remaining checks are only performed for interfaces
 238                          * with the same MAC address.
 239                          */
 240                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 241                                 continue;
 242
 243                         /*
 244                          * check whether it may have the same address
 245                          */
 246                         if (!identical_mac_addr_allowed(sdata->vif.type,
 247                                                         nsdata->vif.type))
 248                                 return -ENOTUNIQ;
 249
 250                         /*
 251                          * can only add VLANs to enabled APs
 252                          */
 253                         if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN &&
 254                             nsdata->vif.type == IEEE80211_IF_TYPE_AP)
 255                                 sdata->u.vlan.ap = nsdata;
 256                 }
 257         }
 258
 259         switch (sdata->vif.type) {
 260         case IEEE80211_IF_TYPE_WDS:
 261                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 262                         return -ENOLINK;
 263                 break;
 264         case IEEE80211_IF_TYPE_VLAN:
 265                 if (!sdata->u.vlan.ap)
 266                         return -ENOLINK;
 267                 break;
 268         case IEEE80211_IF_TYPE_AP:
 269         case IEEE80211_IF_TYPE_STA:
 270         case IEEE80211_IF_TYPE_MNTR:
 271         case IEEE80211_IF_TYPE_IBSS:
 272         case IEEE80211_IF_TYPE_MESH_POINT:
 273                 /* no special treatment */
 274                 break;
 275         case IEEE80211_IF_TYPE_INVALID:
 276                 /* cannot happen */
 277                 WARN_ON(1);
 278                 break;
 279         }
 280
 281         if (local->open_count == 0) {
 282                 res = 0;
 283                 if (local->ops->start)
 284                         res = local->ops->start(local_to_hw(local));
 285                 if (res)
 286                         return res;
 287                 need_hw_reconfig = 1;
 288                 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
 289         }
 290
 291         switch (sdata->vif.type) {
 292         case IEEE80211_IF_TYPE_VLAN:
 293                 list_add(&sdata->u.vlan.list, &sdata->u.vlan.ap->u.ap.vlans);
 294                 /* no need to tell driver */
 295                 break;
 296         case IEEE80211_IF_TYPE_MNTR:
 297                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 298                         local->cooked_mntrs++;
 299                         break;
 300                 }
 301
 302                 /* must be before the call to ieee80211_configure_filter */
 303                 local->monitors++;
 304                 if (local->monitors == 1)
 305                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 306
 307                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 308                         local->fif_fcsfail++;
 309                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 310                         local->fif_plcpfail++;
 311                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 312                         local->fif_control++;
 313                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 314                         local->fif_other_bss++;
 315
 316                 netif_tx_lock_bh(local->mdev);
 317                 ieee80211_configure_filter(local);
 318                 netif_tx_unlock_bh(local->mdev);
 319                 break;
 320         case IEEE80211_IF_TYPE_STA:
 321         case IEEE80211_IF_TYPE_IBSS:
 322                 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
 323                 /* fall through */
 324         default:
 325                 conf.vif = &sdata->vif;
 326                 conf.type = sdata->vif.type;
 327                 conf.mac_addr = dev->dev_addr;
 328                 res = local->ops->add_interface(local_to_hw(local), &conf);
 329                 if (res)
 330                         goto err_stop;
 331
 332                 ieee80211_if_config(dev);
 333                 changed |= ieee80211_reset_erp_info(dev);
 334                 ieee80211_bss_info_change_notify(sdata, changed);
 335                 ieee80211_enable_keys(sdata);
 336
 337                 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
 338                     !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
 339                         netif_carrier_off(dev);
 340                 else
 341                         netif_carrier_on(dev);
 342         }
 343
 344         if (sdata->vif.type == IEEE80211_IF_TYPE_WDS) {
 345                 /* Create STA entry for the WDS peer */
 346                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 347                                      GFP_KERNEL);
 348                 if (!sta) {
 349                         res = -ENOMEM;
 350                         goto err_del_interface;
 351                 }
 352
 353                 /* no locking required since STA is not live yet */
 354                 sta->flags |= WLAN_STA_AUTHORIZED;
 355
 356                 res = sta_info_insert(sta);
 357                 if (res) {
 358                         /* STA has been freed */
 359                         goto err_del_interface;
 360                 }
 361         }
 362
 363         if (local->open_count == 0) {
 364                 res = dev_open(local->mdev);
 365                 WARN_ON(res);
 366                 if (res)
 367                         goto err_del_interface;
 368                 tasklet_enable(&local->tx_pending_tasklet);
 369                 tasklet_enable(&local->tasklet);
 370         }
 371
 372         /*
 373          * set_multicast_list will be invoked by the networking core
 374          * which will check whether any increments here were done in
 375          * error and sync them down to the hardware as filter flags.
 376          */
 377         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 378                 atomic_inc(&local->iff_allmultis);
 379
 380         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 381                 atomic_inc(&local->iff_promiscs);
 382
 383         local->open_count++;
 384         if (need_hw_reconfig)
 385                 ieee80211_hw_config(local);
 386
 387         /*
 388          * ieee80211_sta_work is disabled while network interface
 389          * is down. Therefore, some configuration changes may not
 390          * yet be effective. Trigger execution of ieee80211_sta_work
 391          * to fix this.
 392          */
 393         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
 394             sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
 395                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 396                 queue_work(local->hw.workqueue, &ifsta->work);
 397         }
 398
 399         netif_start_queue(dev);
 400
 401         return 0;
 402  err_del_interface:
 403         local->ops->remove_interface(local_to_hw(local), &conf);
 404  err_stop:
 405         if (!local->open_count && local->ops->stop)
 406                 local->ops->stop(local_to_hw(local));
 407         return res;
 408 }
 409
 410 static int ieee80211_stop(struct net_device *dev)
 411 {
 412         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 413         struct ieee80211_local *local = sdata->local;
 414         struct ieee80211_if_init_conf conf;
 415         struct sta_info *sta;
 416
 417         /*
 418          * Stop TX on this interface first.
 419          */
 420         netif_stop_queue(dev);
 421
 422         /*
 423          * Now delete all active aggregation sessions.
 424          */
 425         rcu_read_lock();
 426
 427         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 428                 if (sta->sdata == sdata)
 429                         ieee80211_sta_tear_down_BA_sessions(dev, sta->addr);
 430         }
 431
 432         rcu_read_unlock();
 433
 434         /*
 435          * Remove all stations associated with this interface.
 436          *
 437          * This must be done before calling ops->remove_interface()
 438          * because otherwise we can later invoke ops->sta_notify()
 439          * whenever the STAs are removed, and that invalidates driver
 440          * assumptions about always getting a vif pointer that is valid
 441          * (because if we remove a STA after ops->remove_interface()
 442          * the driver will have removed the vif info already!)
 443          *
 444          * We could relax this and only unlink the stations from the
 445          * hash table and list but keep them on a per-sdata list that
 446          * will be inserted back again when the interface is brought
 447          * up again, but I don't currently see a use case for that,
 448          * except with WDS which gets a STA entry created when it is
 449          * brought up.
 450          */
 451         sta_info_flush(local, sdata);
 452
 453         /*
 454          * Don't count this interface for promisc/allmulti while it
 455          * is down. dev_mc_unsync() will invoke set_multicast_list
 456          * on the master interface which will sync these down to the
 457          * hardware as filter flags.
 458          */
 459         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 460                 atomic_dec(&local->iff_allmultis);
 461
 462         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 463                 atomic_dec(&local->iff_promiscs);
 464
 465         dev_mc_unsync(local->mdev, dev);
 466
 467         /* APs need special treatment */
 468         if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
 469                 struct ieee80211_sub_if_data *vlan, *tmp;
 470                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 471
 472                 /* remove beacon */
 473                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 474                 synchronize_rcu();
 475                 kfree(old_beacon);
 476
 477                 /* down all dependent devices, that is VLANs */
 478                 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
 479                                          u.vlan.list)
 480                         dev_close(vlan->dev);
 481                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 482         }
 483
 484         local->open_count--;
 485
 486         switch (sdata->vif.type) {
 487         case IEEE80211_IF_TYPE_VLAN:
 488                 list_del(&sdata->u.vlan.list);
 489                 sdata->u.vlan.ap = NULL;
 490                 /* no need to tell driver */
 491                 break;
 492         case IEEE80211_IF_TYPE_MNTR:
 493                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 494                         local->cooked_mntrs--;
 495                         break;
 496                 }
 497
 498                 local->monitors--;
 499                 if (local->monitors == 0)
 500                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
 501
 502                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 503                         local->fif_fcsfail--;
 504                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 505                         local->fif_plcpfail--;
 506                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 507                         local->fif_control--;
 508                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 509                         local->fif_other_bss--;
 510
 511                 netif_tx_lock_bh(local->mdev);
 512                 ieee80211_configure_filter(local);
 513                 netif_tx_unlock_bh(local->mdev);
 514                 break;
 515         case IEEE80211_IF_TYPE_MESH_POINT:
 516         case IEEE80211_IF_TYPE_STA:
 517         case IEEE80211_IF_TYPE_IBSS:
 518                 sdata->u.sta.state = IEEE80211_DISABLED;
 519                 memset(sdata->u.sta.bssid, 0, ETH_ALEN);
 520                 del_timer_sync(&sdata->u.sta.timer);
 521                 /*
 522                  * When we get here, the interface is marked down.
 523                  * Call synchronize_rcu() to wait for the RX path
 524                  * should it be using the interface and enqueuing
 525                  * frames at this very time on another CPU.
 526                  */
 527                 synchronize_rcu();
 528                 skb_queue_purge(&sdata->u.sta.skb_queue);
 529
 530                 if (local->scan_dev == sdata->dev) {
 531                         if (!local->ops->hw_scan) {
 532                                 local->sta_sw_scanning = 0;
 533                                 cancel_delayed_work(&local->scan_work);
 534                         } else
 535                                 local->sta_hw_scanning = 0;
 536                 }
 537
 538                 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
 539                 kfree(sdata->u.sta.extra_ie);
 540                 sdata->u.sta.extra_ie = NULL;
 541                 sdata->u.sta.extra_ie_len = 0;
 542                 /* fall through */
 543         default:
 544                 conf.vif = &sdata->vif;
 545                 conf.type = sdata->vif.type;
 546                 conf.mac_addr = dev->dev_addr;
 547                 /* disable all keys for as long as this netdev is down */
 548                 ieee80211_disable_keys(sdata);
 549                 local->ops->remove_interface(local_to_hw(local), &conf);
 550         }
 551
 552         if (local->open_count == 0) {
 553                 if (netif_running(local->mdev))
 554                         dev_close(local->mdev);
 555
 556                 if (local->ops->stop)
 557                         local->ops->stop(local_to_hw(local));
 558
 559                 ieee80211_led_radio(local, 0);
 560
 561                 flush_workqueue(local->hw.workqueue);
 562
 563                 tasklet_disable(&local->tx_pending_tasklet);
 564                 tasklet_disable(&local->tasklet);
 565         }
 566
 567         return 0;
 568 }
 569
 570 int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid)
 571 {
 572         struct ieee80211_local *local = hw_to_local(hw);
 573         struct sta_info *sta;
 574         struct ieee80211_sub_if_data *sdata;
 575         u16 start_seq_num = 0;
 576         u8 *state;
 577         int ret;
 578         DECLARE_MAC_BUF(mac);
 579
 580         if (tid >= STA_TID_NUM)
 581                 return -EINVAL;
 582
 583 #ifdef CONFIG_MAC80211_HT_DEBUG
 584         printk(KERN_DEBUG "Open BA session requested for %s tid %u\n",
 585                                 print_mac(mac, ra), tid);
 586 #endif /* CONFIG_MAC80211_HT_DEBUG */
 587
 588         rcu_read_lock();
 589
 590         sta = sta_info_get(local, ra);
 591         if (!sta) {
 592 #ifdef CONFIG_MAC80211_HT_DEBUG
 593                 printk(KERN_DEBUG "Could not find the station\n");
 594 #endif
 595                 ret = -ENOENT;
 596                 goto exit;
 597         }
 598
 599         spin_lock_bh(&sta->lock);
 600
 601         /* we have tried too many times, receiver does not want A-MPDU */
 602         if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
 603                 ret = -EBUSY;
 604                 goto err_unlock_sta;
 605         }
 606
 607         state = &sta->ampdu_mlme.tid_state_tx[tid];
 608         /* check if the TID is not in aggregation flow already */
 609         if (*state != HT_AGG_STATE_IDLE) {
 610 #ifdef CONFIG_MAC80211_HT_DEBUG
 611                 printk(KERN_DEBUG "BA request denied - session is not "
 612                                  "idle on tid %u\n", tid);
 613 #endif /* CONFIG_MAC80211_HT_DEBUG */
 614                 ret = -EAGAIN;
 615                 goto err_unlock_sta;
 616         }
 617
 618         /* prepare A-MPDU MLME for Tx aggregation */
 619         sta->ampdu_mlme.tid_tx[tid] =
 620                         kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
 621         if (!sta->ampdu_mlme.tid_tx[tid]) {
 622 #ifdef CONFIG_MAC80211_HT_DEBUG
 623                 if (net_ratelimit())
 624                         printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
 625                                         tid);
 626 #endif
 627                 ret = -ENOMEM;
 628                 goto err_unlock_sta;
 629         }
 630         /* Tx timer */
 631         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function =
 632                         sta_addba_resp_timer_expired;
 633         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data =
 634                         (unsigned long)&sta->timer_to_tid[tid];
 635         init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
 636
 637         /* ensure that TX flow won't interrupt us
 638          * until the end of the call to requeue function */
 639         spin_lock_bh(&local->mdev->tx_queue.lock);
 640
 641         /* create a new queue for this aggregation */
 642         ret = ieee80211_ht_agg_queue_add(local, sta, tid);
 643
 644         /* case no queue is available to aggregation
 645          * don't switch to aggregation */
 646         if (ret) {
 647 #ifdef CONFIG_MAC80211_HT_DEBUG
 648                 printk(KERN_DEBUG "BA request denied - queue unavailable for"
 649                                         " tid %d\n", tid);
 650 #endif /* CONFIG_MAC80211_HT_DEBUG */
 651                 goto err_unlock_queue;
 652         }
 653         sdata = sta->sdata;
 654
 655         /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
 656          * call back right away, it must see that the flow has begun */
 657         *state |= HT_ADDBA_REQUESTED_MSK;
 658
 659         if (local->ops->ampdu_action)
 660                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
 661                                                 ra, tid, &start_seq_num);
 662
 663         if (ret) {
 664                 /* No need to requeue the packets in the agg queue, since we
 665                  * held the tx lock: no packet could be enqueued to the newly
 666                  * allocated queue */
 667                  ieee80211_ht_agg_queue_remove(local, sta, tid, 0);
 668 #ifdef CONFIG_MAC80211_HT_DEBUG
 669                 printk(KERN_DEBUG "BA request denied - HW unavailable for"
 670                                         " tid %d\n", tid);
 671 #endif /* CONFIG_MAC80211_HT_DEBUG */
 672                 *state = HT_AGG_STATE_IDLE;
 673                 goto err_unlock_queue;
 674         }
 675
 676         /* Will put all the packets in the new SW queue */
 677         ieee80211_requeue(local, ieee802_1d_to_ac[tid]);
 678         spin_unlock_bh(&local->mdev->tx_queue.lock);
 679         spin_unlock_bh(&sta->lock);
 680
 681         /* send an addBA request */
 682         sta->ampdu_mlme.dialog_token_allocator++;
 683         sta->ampdu_mlme.tid_tx[tid]->dialog_token =
 684                         sta->ampdu_mlme.dialog_token_allocator;
 685         sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
 686
 687
 688         ieee80211_send_addba_request(sta->sdata->dev, ra, tid,
 689                          sta->ampdu_mlme.tid_tx[tid]->dialog_token,
 690                          sta->ampdu_mlme.tid_tx[tid]->ssn,
 691                          0x40, 5000);
 692         /* activate the timer for the recipient's addBA response */
 693         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
 694                                 jiffies + ADDBA_RESP_INTERVAL;
 695         add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
 696 #ifdef CONFIG_MAC80211_HT_DEBUG
 697         printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
 698 #endif
 699         goto exit;
 700
 701 err_unlock_queue:
 702         kfree(sta->ampdu_mlme.tid_tx[tid]);
 703         sta->ampdu_mlme.tid_tx[tid] = NULL;
 704         spin_unlock_bh(&local->mdev->tx_queue.lock);
 705         ret = -EBUSY;
 706 err_unlock_sta:
 707         spin_unlock_bh(&sta->lock);
 708 exit:
 709         rcu_read_unlock();
 710         return ret;
 711 }
 712 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
 713
 714 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
 715                                  u8 *ra, u16 tid,
 716                                  enum ieee80211_back_parties initiator)
 717 {
 718         struct ieee80211_local *local = hw_to_local(hw);
 719         struct sta_info *sta;
 720         u8 *state;
 721         int ret = 0;
 722         DECLARE_MAC_BUF(mac);
 723
 724         if (tid >= STA_TID_NUM)
 725                 return -EINVAL;
 726
 727         rcu_read_lock();
 728         sta = sta_info_get(local, ra);
 729         if (!sta) {
 730                 rcu_read_unlock();
 731                 return -ENOENT;
 732         }
 733
 734         /* check if the TID is in aggregation */
 735         state = &sta->ampdu_mlme.tid_state_tx[tid];
 736         spin_lock_bh(&sta->lock);
 737
 738         if (*state != HT_AGG_STATE_OPERATIONAL) {
 739                 ret = -ENOENT;
 740                 goto stop_BA_exit;
 741         }
 742
 743 #ifdef CONFIG_MAC80211_HT_DEBUG
 744         printk(KERN_DEBUG "Tx BA session stop requested for %s tid %u\n",
 745                                 print_mac(mac, ra), tid);
 746 #endif /* CONFIG_MAC80211_HT_DEBUG */
 747
 748         ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]);
 749
 750         *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
 751                 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
 752
 753         if (local->ops->ampdu_action)
 754                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP,
 755                                                 ra, tid, NULL);
 756
 757         /* case HW denied going back to legacy */
 758         if (ret) {
 759                 WARN_ON(ret != -EBUSY);
 760                 *state = HT_AGG_STATE_OPERATIONAL;
 761                 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
 762                 goto stop_BA_exit;
 763         }
 764
 765 stop_BA_exit:
 766         spin_unlock_bh(&sta->lock);
 767         rcu_read_unlock();
 768         return ret;
 769 }
 770 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
 771
 772 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
 773 {
 774         struct ieee80211_local *local = hw_to_local(hw);
 775         struct sta_info *sta;
 776         u8 *state;
 777         DECLARE_MAC_BUF(mac);
 778
 779         if (tid >= STA_TID_NUM) {
 780 #ifdef CONFIG_MAC80211_HT_DEBUG
 781                 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
 782                                 tid, STA_TID_NUM);
 783 #endif
 784                 return;
 785         }
 786
 787         rcu_read_lock();
 788         sta = sta_info_get(local, ra);
 789         if (!sta) {
 790                 rcu_read_unlock();
 791 #ifdef CONFIG_MAC80211_HT_DEBUG
 792                 printk(KERN_DEBUG "Could not find station: %s\n",
 793                                 print_mac(mac, ra));
 794 #endif
 795                 return;
 796         }
 797
 798         state = &sta->ampdu_mlme.tid_state_tx[tid];
 799         spin_lock_bh(&sta->lock);
 800
 801         if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
 802 #ifdef CONFIG_MAC80211_HT_DEBUG
 803                 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
 804                                 *state);
 805 #endif
 806                 spin_unlock_bh(&sta->lock);
 807                 rcu_read_unlock();
 808                 return;
 809         }
 810
 811         WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK);
 812
 813         *state |= HT_ADDBA_DRV_READY_MSK;
 814
 815         if (*state == HT_AGG_STATE_OPERATIONAL) {
 816 #ifdef CONFIG_MAC80211_HT_DEBUG
 817                 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
 818 #endif
 819                 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
 820         }
 821         spin_unlock_bh(&sta->lock);
 822         rcu_read_unlock();
 823 }
 824 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
 825
 826 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
 827 {
 828         struct ieee80211_local *local = hw_to_local(hw);
 829         struct sta_info *sta;
 830         u8 *state;
 831         int agg_queue;
 832         DECLARE_MAC_BUF(mac);
 833
 834         if (tid >= STA_TID_NUM) {
 835 #ifdef CONFIG_MAC80211_HT_DEBUG
 836                 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
 837                                 tid, STA_TID_NUM);
 838 #endif
 839                 return;
 840         }
 841
 842 #ifdef CONFIG_MAC80211_HT_DEBUG
 843         printk(KERN_DEBUG "Stopping Tx BA session for %s tid %d\n",
 844                                 print_mac(mac, ra), tid);
 845 #endif /* CONFIG_MAC80211_HT_DEBUG */
 846
 847         rcu_read_lock();
 848         sta = sta_info_get(local, ra);
 849         if (!sta) {
 850 #ifdef CONFIG_MAC80211_HT_DEBUG
 851                 printk(KERN_DEBUG "Could not find station: %s\n",
 852                                 print_mac(mac, ra));
 853 #endif
 854                 rcu_read_unlock();
 855                 return;
 856         }
 857         state = &sta->ampdu_mlme.tid_state_tx[tid];
 858
 859         /* NOTE: no need to use sta->lock in this state check, as
 860          * ieee80211_stop_tx_ba_session will let only
 861          * one stop call to pass through per sta/tid */
 862         if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
 863 #ifdef CONFIG_MAC80211_HT_DEBUG
 864                 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
 865 #endif
 866                 rcu_read_unlock();
 867                 return;
 868         }
 869
 870         if (*state & HT_AGG_STATE_INITIATOR_MSK)
 871                 ieee80211_send_delba(sta->sdata->dev, ra, tid,
 872                         WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
 873
 874         agg_queue = sta->tid_to_tx_q[tid];
 875
 876         /* avoid ordering issues: we are the only one that can modify
 877          * the content of the qdiscs */
 878         spin_lock_bh(&local->mdev->tx_queue.lock);
 879         /* remove the queue for this aggregation */
 880         ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
 881         spin_unlock_bh(&local->mdev->tx_queue.lock);
 882
 883         /* we just requeued the all the frames that were in the removed
 884          * queue, and since we might miss a softirq we do netif_schedule.
 885          * ieee80211_wake_queue is not used here as this queue is not
 886          * necessarily stopped */
 887         netif_schedule(local->mdev);
 888         spin_lock_bh(&sta->lock);
 889         *state = HT_AGG_STATE_IDLE;
 890         sta->ampdu_mlme.addba_req_num[tid] = 0;
 891         kfree(sta->ampdu_mlme.tid_tx[tid]);
 892         sta->ampdu_mlme.tid_tx[tid] = NULL;
 893         spin_unlock_bh(&sta->lock);
 894
 895         rcu_read_unlock();
 896 }
 897 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
 898
 899 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
 900                                       const u8 *ra, u16 tid)
 901 {
 902         struct ieee80211_local *local = hw_to_local(hw);
 903         struct ieee80211_ra_tid *ra_tid;
 904         struct sk_buff *skb = dev_alloc_skb(0);
 905
 906         if (unlikely(!skb)) {
 907 #ifdef CONFIG_MAC80211_HT_DEBUG
 908                 if (net_ratelimit())
 909                         printk(KERN_WARNING "%s: Not enough memory, "
 910                                "dropping start BA session", skb->dev->name);
 911 #endif
 912                 return;
 913         }
 914         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 915         memcpy(&ra_tid->ra, ra, ETH_ALEN);
 916         ra_tid->tid = tid;
 917
 918         skb->pkt_type = IEEE80211_ADDBA_MSG;
 919         skb_queue_tail(&local->skb_queue, skb);
 920         tasklet_schedule(&local->tasklet);
 921 }
 922 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
 923
 924 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
 925                                      const u8 *ra, u16 tid)
 926 {
 927         struct ieee80211_local *local = hw_to_local(hw);
 928         struct ieee80211_ra_tid *ra_tid;
 929         struct sk_buff *skb = dev_alloc_skb(0);
 930
 931         if (unlikely(!skb)) {
 932 #ifdef CONFIG_MAC80211_HT_DEBUG
 933                 if (net_ratelimit())
 934                         printk(KERN_WARNING "%s: Not enough memory, "
 935                                "dropping stop BA session", skb->dev->name);
 936 #endif
 937                 return;
 938         }
 939         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 940         memcpy(&ra_tid->ra, ra, ETH_ALEN);
 941         ra_tid->tid = tid;
 942
 943         skb->pkt_type = IEEE80211_DELBA_MSG;
 944         skb_queue_tail(&local->skb_queue, skb);
 945         tasklet_schedule(&local->tasklet);
 946 }
 947 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
 948
 949 static void ieee80211_set_multicast_list(struct net_device *dev)
 950 {
 951         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 952         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 953         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 954
 955         allmulti = !!(dev->flags & IFF_ALLMULTI);
 956         promisc = !!(dev->flags & IFF_PROMISC);
 957         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 958         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 959
 960         if (allmulti != sdata_allmulti) {
 961                 if (dev->flags & IFF_ALLMULTI)
 962                         atomic_inc(&local->iff_allmultis);
 963                 else
 964                         atomic_dec(&local->iff_allmultis);
 965                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 966         }
 967
 968         if (promisc != sdata_promisc) {
 969                 if (dev->flags & IFF_PROMISC)
 970                         atomic_inc(&local->iff_promiscs);
 971                 else
 972                         atomic_dec(&local->iff_promiscs);
 973                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 974         }
 975
 976         dev_mc_sync(local->mdev, dev);
 977 }
 978
 979 static const struct header_ops ieee80211_header_ops = {
 980         .create         = eth_header,
 981         .parse          = header_parse_80211,
 982         .rebuild        = eth_rebuild_header,
 983         .cache          = eth_header_cache,
 984         .cache_update   = eth_header_cache_update,
 985 };
 986
 987 /* Must not be called for mdev */
 988 void ieee80211_if_setup(struct net_device *dev)
 989 {
 990         ether_setup(dev);
 991         dev->hard_start_xmit = ieee80211_subif_start_xmit;
 992         dev->wireless_handlers = &ieee80211_iw_handler_def;
 993         dev->set_multicast_list = ieee80211_set_multicast_list;
 994         dev->change_mtu = ieee80211_change_mtu;
 995         dev->open = ieee80211_open;
 996         dev->stop = ieee80211_stop;
 997         dev->destructor = ieee80211_if_free;
 998 }
 999
1000 /* everything else */
1001
1002 static int __ieee80211_if_config(struct net_device *dev,
1003                                  struct sk_buff *beacon)
1004 {
1005         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1006         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1007         struct ieee80211_if_conf conf;
1008
1009         if (!local->ops->config_interface || !netif_running(dev))
1010                 return 0;
1011
1012         memset(&conf, 0, sizeof(conf));
1013         conf.type = sdata->vif.type;
1014         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
1015             sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
1016                 conf.bssid = sdata->u.sta.bssid;
1017                 conf.ssid = sdata->u.sta.ssid;
1018                 conf.ssid_len = sdata->u.sta.ssid_len;
1019         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
1020                 conf.beacon = beacon;
1021                 ieee80211_start_mesh(dev);
1022         } else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
1023                 conf.ssid = sdata->u.ap.ssid;
1024                 conf.ssid_len = sdata->u.ap.ssid_len;
1025                 conf.beacon = beacon;
1026         }
1027         return local->ops->config_interface(local_to_hw(local),
1028                                             &sdata->vif, &conf);
1029 }
1030
1031 int ieee80211_if_config(struct net_device *dev)
1032 {
1033         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1034         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1035         if (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT &&
1036             (local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
1037                 return ieee80211_if_config_beacon(dev);
1038         return __ieee80211_if_config(dev, NULL);
1039 }
1040
1041 int ieee80211_if_config_beacon(struct net_device *dev)
1042 {
1043         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1044         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1045         struct sk_buff *skb;
1046
1047         if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
1048                 return 0;
1049         skb = ieee80211_beacon_get(local_to_hw(local), &sdata->vif);
1050         if (!skb)
1051                 return -ENOMEM;
1052         return __ieee80211_if_config(dev, skb);
1053 }
1054
1055 int ieee80211_hw_config(struct ieee80211_local *local)
1056 {
1057         struct ieee80211_channel *chan;
1058         int ret = 0;
1059
1060         if (local->sta_sw_scanning)
1061                 chan = local->scan_channel;
1062         else
1063                 chan = local->oper_channel;
1064
1065         local->hw.conf.channel = chan;
1066
1067         if (!local->hw.conf.power_level)
1068                 local->hw.conf.power_level = chan->max_power;
1069         else
1070                 local->hw.conf.power_level = min(chan->max_power,
1071                                                local->hw.conf.power_level);
1072
1073         local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
1074
1075 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1076         printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
1077                wiphy_name(local->hw.wiphy), chan->center_freq);
1078 #endif
1079
1080         if (local->open_count)
1081                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
1082
1083         return ret;
1084 }
1085
1086 /**
1087  * ieee80211_handle_ht should be used only after legacy configuration
1088  * has been determined namely band, as ht configuration depends upon
1089  * the hardware's HT abilities for a _specific_ band.
1090  */
1091 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
1092                            struct ieee80211_ht_info *req_ht_cap,
1093                            struct ieee80211_ht_bss_info *req_bss_cap)
1094 {
1095         struct ieee80211_conf *conf = &local->hw.conf;
1096         struct ieee80211_supported_band *sband;
1097         struct ieee80211_ht_info ht_conf;
1098         struct ieee80211_ht_bss_info ht_bss_conf;
1099         u32 changed = 0;
1100         int i;
1101         u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS;
1102         u8 tx_mcs_set_cap;
1103
1104         sband = local->hw.wiphy->bands[conf->channel->band];
1105
1106         memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
1107         memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
1108
1109         /* HT is not supported */
1110         if (!sband->ht_info.ht_supported) {
1111                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1112                 goto out;
1113         }
1114
1115         /* disable HT */
1116         if (!enable_ht) {
1117                 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
1118                         changed |= BSS_CHANGED_HT;
1119                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1120                 conf->ht_conf.ht_supported = 0;
1121                 goto out;
1122         }
1123
1124
1125         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
1126                 changed |= BSS_CHANGED_HT;
1127
1128         conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
1129         ht_conf.ht_supported = 1;
1130
1131         ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
1132         ht_conf.cap &= ~(IEEE80211_HT_CAP_MIMO_PS);
1133         ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_MIMO_PS;
1134         ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
1135         ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
1136         ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
1137
1138         ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
1139         ht_conf.ampdu_density = req_ht_cap->ampdu_density;
1140
1141         /* Bits 96-100 */
1142         tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12];
1143
1144         /* configure suppoerted Tx MCS according to requested MCS
1145          * (based in most cases on Rx capabilities of peer) and self
1146          * Tx MCS capabilities (as defined by low level driver HW
1147          * Tx capabilities) */
1148         if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED))
1149                 goto check_changed;
1150
1151         /* Counting from 0 therfore + 1 */
1152         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF)
1153                 max_tx_streams = ((tx_mcs_set_cap &
1154                                 IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1;
1155
1156         for (i = 0; i < max_tx_streams; i++)
1157                 ht_conf.supp_mcs_set[i] =
1158                         sband->ht_info.supp_mcs_set[i] &
1159                                         req_ht_cap->supp_mcs_set[i];
1160
1161         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM)
1162                 for (i = IEEE80211_SUPP_MCS_SET_UEQM;
1163                      i < IEEE80211_SUPP_MCS_SET_LEN; i++)
1164                         ht_conf.supp_mcs_set[i] =
1165                                 sband->ht_info.supp_mcs_set[i] &
1166                                         req_ht_cap->supp_mcs_set[i];
1167
1168 check_changed:
1169         /* if bss configuration changed store the new one */
1170         if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
1171             memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
1172                 changed |= BSS_CHANGED_HT;
1173                 memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
1174                 memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
1175         }
1176 out:
1177         return changed;
1178 }
1179
1180 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1181                                       u32 changed)
1182 {
1183         struct ieee80211_local *local = sdata->local;
1184
1185         if (!changed)
1186                 return;
1187
1188         if (local->ops->bss_info_changed)
1189                 local->ops->bss_info_changed(local_to_hw(local),
1190                                              &sdata->vif,
1191                                              &sdata->bss_conf,
1192                                              changed);
1193 }
1194
1195 u32 ieee80211_reset_erp_info(struct net_device *dev)
1196 {
1197         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1198
1199         sdata->bss_conf.use_cts_prot = 0;
1200         sdata->bss_conf.use_short_preamble = 0;
1201         return BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE;
1202 }
1203
1204 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
1205                                  struct sk_buff *skb)
1206 {
1207         struct ieee80211_local *local = hw_to_local(hw);
1208         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1209         int tmp;
1210
1211         skb->dev = local->mdev;
1212         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
1213         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
1214                        &local->skb_queue : &local->skb_queue_unreliable, skb);
1215         tmp = skb_queue_len(&local->skb_queue) +
1216                 skb_queue_len(&local->skb_queue_unreliable);
1217         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
1218                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1219                 dev_kfree_skb_irq(skb);
1220                 tmp--;
1221                 I802_DEBUG_INC(local->tx_status_drop);
1222         }
1223         tasklet_schedule(&local->tasklet);
1224 }
1225 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
1226
1227 static void ieee80211_tasklet_handler(unsigned long data)
1228 {
1229         struct ieee80211_local *local = (struct ieee80211_local *) data;
1230         struct sk_buff *skb;
1231         struct ieee80211_rx_status rx_status;
1232         struct ieee80211_ra_tid *ra_tid;
1233
1234         while ((skb = skb_dequeue(&local->skb_queue)) ||
1235                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1236                 switch (skb->pkt_type) {
1237                 case IEEE80211_RX_MSG:
1238                         /* status is in skb->cb */
1239                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
1240                         /* Clear skb->pkt_type in order to not confuse kernel
1241                          * netstack. */
1242                         skb->pkt_type = 0;
1243                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
1244                         break;
1245                 case IEEE80211_TX_STATUS_MSG:
1246                         skb->pkt_type = 0;
1247                         ieee80211_tx_status(local_to_hw(local), skb);
1248                         break;
1249                 case IEEE80211_DELBA_MSG:
1250                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1251                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
1252                                                 ra_tid->ra, ra_tid->tid);
1253                         dev_kfree_skb(skb);
1254                         break;
1255                 case IEEE80211_ADDBA_MSG:
1256                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1257                         ieee80211_start_tx_ba_cb(local_to_hw(local),
1258                                                  ra_tid->ra, ra_tid->tid);
1259                         dev_kfree_skb(skb);
1260                         break ;
1261                 default:
1262                         WARN_ON(1);
1263                         dev_kfree_skb(skb);
1264                         break;
1265                 }
1266         }
1267 }
1268
1269 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
1270  * make a prepared TX frame (one that has been given to hw) to look like brand
1271  * new IEEE 802.11 frame that is ready to go through TX processing again.
1272  * Also, tx_packet_data in cb is restored from tx_control. */
1273 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
1274                                       struct ieee80211_key *key,
1275                                       struct sk_buff *skb)
1276 {
1277         int hdrlen, iv_len, mic_len;
1278         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1279
1280         info->flags &=  IEEE80211_TX_CTL_REQ_TX_STATUS |
1281                         IEEE80211_TX_CTL_DO_NOT_ENCRYPT |
1282                         IEEE80211_TX_CTL_REQUEUE |
1283                         IEEE80211_TX_CTL_EAPOL_FRAME;
1284
1285         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1286
1287         if (!key)
1288                 goto no_key;
1289
1290         switch (key->conf.alg) {
1291         case ALG_WEP:
1292                 iv_len = WEP_IV_LEN;
1293                 mic_len = WEP_ICV_LEN;
1294                 break;
1295         case ALG_TKIP:
1296                 iv_len = TKIP_IV_LEN;
1297                 mic_len = TKIP_ICV_LEN;
1298                 break;
1299         case ALG_CCMP:
1300                 iv_len = CCMP_HDR_LEN;
1301                 mic_len = CCMP_MIC_LEN;
1302                 break;
1303         default:
1304                 goto no_key;
1305         }
1306
1307         if (skb->len >= mic_len &&
1308             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
1309                 skb_trim(skb, skb->len - mic_len);
1310         if (skb->len >= iv_len && skb->len > hdrlen) {
1311                 memmove(skb->data + iv_len, skb->data, hdrlen);
1312                 skb_pull(skb, iv_len);
1313         }
1314
1315 no_key:
1316         {
1317                 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1318                 u16 fc = le16_to_cpu(hdr->frame_control);
1319                 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
1320                         fc &= ~IEEE80211_STYPE_QOS_DATA;
1321                         hdr->frame_control = cpu_to_le16(fc);
1322                         memmove(skb->data + 2, skb->data, hdrlen - 2);
1323                         skb_pull(skb, 2);
1324                 }
1325         }
1326 }
1327
1328 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
1329                                             struct sta_info *sta,
1330                                             struct sk_buff *skb)
1331 {
1332         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1333
1334         sta->tx_filtered_count++;
1335
1336         /*
1337          * Clear the TX filter mask for this STA when sending the next
1338          * packet. If the STA went to power save mode, this will happen
1339          * when it wakes up for the next time.
1340          */
1341         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
1342
1343         /*
1344          * This code races in the following way:
1345          *
1346          *  (1) STA sends frame indicating it will go to sleep and does so
1347          *  (2) hardware/firmware adds STA to filter list, passes frame up
1348          *  (3) hardware/firmware processes TX fifo and suppresses a frame
1349          *  (4) we get TX status before having processed the frame and
1350          *      knowing that the STA has gone to sleep.
1351          *
1352          * This is actually quite unlikely even when both those events are
1353          * processed from interrupts coming in quickly after one another or
1354          * even at the same time because we queue both TX status events and
1355          * RX frames to be processed by a tasklet and process them in the
1356          * same order that they were received or TX status last. Hence, there
1357          * is no race as long as the frame RX is processed before the next TX
1358          * status, which drivers can ensure, see below.
1359          *
1360          * Note that this can only happen if the hardware or firmware can
1361          * actually add STAs to the filter list, if this is done by the
1362          * driver in response to set_tim() (which will only reduce the race
1363          * this whole filtering tries to solve, not completely solve it)
1364          * this situation cannot happen.
1365          *
1366          * To completely solve this race drivers need to make sure that they
1367          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
1368          *      functions and
1369          *  (b) always process RX events before TX status events if ordering
1370          *      can be unknown, for example with different interrupt status
1371          *      bits.
1372          */
1373         if (test_sta_flags(sta, WLAN_STA_PS) &&
1374             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
1375                 ieee80211_remove_tx_extra(local, sta->key, skb);
1376                 skb_queue_tail(&sta->tx_filtered, skb);
1377                 return;
1378         }
1379
1380         if (!test_sta_flags(sta, WLAN_STA_PS) &&
1381             !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
1382                 /* Software retry the packet once */
1383                 info->flags |= IEEE80211_TX_CTL_REQUEUE;
1384                 ieee80211_remove_tx_extra(local, sta->key, skb);
1385                 dev_queue_xmit(skb);
1386                 return;
1387         }
1388
1389 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1390         if (net_ratelimit())
1391                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
1392                        "queue_len=%d PS=%d @%lu\n",
1393                        wiphy_name(local->hw.wiphy),
1394                        skb_queue_len(&sta->tx_filtered),
1395                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
1396 #endif
1397         dev_kfree_skb(skb);
1398 }
1399
1400 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1401 {
1402         struct sk_buff *skb2;
1403         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1404         struct ieee80211_local *local = hw_to_local(hw);
1405         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1406         u16 frag, type;
1407         __le16 fc;
1408         struct ieee80211_tx_status_rtap_hdr *rthdr;
1409         struct ieee80211_sub_if_data *sdata;
1410         struct net_device *prev_dev = NULL;
1411         struct sta_info *sta;
1412
1413         rcu_read_lock();
1414
1415         if (info->status.excessive_retries) {
1416                 sta = sta_info_get(local, hdr->addr1);
1417                 if (sta) {
1418                         if (test_sta_flags(sta, WLAN_STA_PS)) {
1419                                 /*
1420                                  * The STA is in power save mode, so assume
1421                                  * that this TX packet failed because of that.
1422                                  */
1423                                 ieee80211_handle_filtered_frame(local, sta, skb);
1424                                 rcu_read_unlock();
1425                                 return;
1426                         }
1427                 }
1428         }
1429
1430         fc = hdr->frame_control;
1431
1432         if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
1433             (ieee80211_is_data_qos(fc))) {
1434                 u16 tid, ssn;
1435                 u8 *qc;
1436                 sta = sta_info_get(local, hdr->addr1);
1437                 if (sta) {
1438                         qc = ieee80211_get_qos_ctl(hdr);
1439                         tid = qc[0] & 0xf;
1440                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
1441                                                 & IEEE80211_SCTL_SEQ);
1442                         ieee80211_send_bar(sta->sdata->dev, hdr->addr1,
1443                                            tid, ssn);
1444                 }
1445         }
1446
1447         if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
1448                 sta = sta_info_get(local, hdr->addr1);
1449                 if (sta) {
1450                         ieee80211_handle_filtered_frame(local, sta, skb);
1451                         rcu_read_unlock();
1452                         return;
1453                 }
1454         } else
1455                 rate_control_tx_status(local->mdev, skb);
1456
1457         rcu_read_unlock();
1458
1459         ieee80211_led_tx(local, 0);
1460
1461         /* SNMP counters
1462          * Fragments are passed to low-level drivers as separate skbs, so these
1463          * are actually fragments, not frames. Update frame counters only for
1464          * the first fragment of the frame. */
1465
1466         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
1467         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
1468
1469         if (info->flags & IEEE80211_TX_STAT_ACK) {
1470                 if (frag == 0) {
1471                         local->dot11TransmittedFrameCount++;
1472                         if (is_multicast_ether_addr(hdr->addr1))
1473                                 local->dot11MulticastTransmittedFrameCount++;
1474                         if (info->status.retry_count > 0)
1475                                 local->dot11RetryCount++;
1476                         if (info->status.retry_count > 1)
1477                                 local->dot11MultipleRetryCount++;
1478                 }
1479
1480                 /* This counter shall be incremented for an acknowledged MPDU
1481                  * with an individual address in the address 1 field or an MPDU
1482                  * with a multicast address in the address 1 field of type Data
1483                  * or Management. */
1484                 if (!is_multicast_ether_addr(hdr->addr1) ||
1485                     type == IEEE80211_FTYPE_DATA ||
1486                     type == IEEE80211_FTYPE_MGMT)
1487                         local->dot11TransmittedFragmentCount++;
1488         } else {
1489                 if (frag == 0)
1490                         local->dot11FailedCount++;
1491         }
1492
1493         /* this was a transmitted frame, but now we want to reuse it */
1494         skb_orphan(skb);
1495
1496         /*
1497          * This is a bit racy but we can avoid a lot of work
1498          * with this test...
1499          */
1500         if (!local->monitors && !local->cooked_mntrs) {
1501                 dev_kfree_skb(skb);
1502                 return;
1503         }
1504
1505         /* send frame to monitor interfaces now */
1506
1507         if (skb_headroom(skb) < sizeof(*rthdr)) {
1508                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
1509                 dev_kfree_skb(skb);
1510                 return;
1511         }
1512
1513         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
1514                                 skb_push(skb, sizeof(*rthdr));
1515
1516         memset(rthdr, 0, sizeof(*rthdr));
1517         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1518         rthdr->hdr.it_present =
1519                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
1520                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
1521
1522         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
1523             !is_multicast_ether_addr(hdr->addr1))
1524                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
1525
1526         if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
1527             (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
1528                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
1529         else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
1530                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
1531
1532         rthdr->data_retries = info->status.retry_count;
1533
1534         /* XXX: is this sufficient for BPF? */
1535         skb_set_mac_header(skb, 0);
1536         skb->ip_summed = CHECKSUM_UNNECESSARY;
1537         skb->pkt_type = PACKET_OTHERHOST;
1538         skb->protocol = htons(ETH_P_802_2);
1539         memset(skb->cb, 0, sizeof(skb->cb));
1540
1541         rcu_read_lock();
1542         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1543                 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) {
1544                         if (!netif_running(sdata->dev))
1545                                 continue;
1546
1547                         if (prev_dev) {
1548                                 skb2 = skb_clone(skb, GFP_ATOMIC);
1549                                 if (skb2) {
1550                                         skb2->dev = prev_dev;
1551                                         netif_rx(skb2);
1552                                 }
1553                         }
1554
1555                         prev_dev = sdata->dev;
1556                 }
1557         }
1558         if (prev_dev) {
1559                 skb->dev = prev_dev;
1560                 netif_rx(skb);
1561                 skb = NULL;
1562         }
1563         rcu_read_unlock();
1564         dev_kfree_skb(skb);
1565 }
1566 EXPORT_SYMBOL(ieee80211_tx_status);
1567
1568 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1569                                         const struct ieee80211_ops *ops)
1570 {
1571         struct ieee80211_local *local;
1572         int priv_size;
1573         struct wiphy *wiphy;
1574
1575         /* Ensure 32-byte alignment of our private data and hw private data.
1576          * We use the wiphy priv data for both our ieee80211_local and for
1577          * the driver's private data
1578          *
1579          * In memory it'll be like this:
1580          *
1581          * +-------------------------+
1582          * | struct wiphy           |
1583          * +-------------------------+
1584          * | struct ieee80211_local  |
1585          * +-------------------------+
1586          * | driver's private data   |
1587          * +-------------------------+
1588          *
1589          */
1590         priv_size = ((sizeof(struct ieee80211_local) +
1591                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
1592                     priv_data_len;
1593
1594         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
1595
1596         if (!wiphy)
1597                 return NULL;
1598
1599         wiphy->privid = mac80211_wiphy_privid;
1600
1601         local = wiphy_priv(wiphy);
1602         local->hw.wiphy = wiphy;
1603
1604         local->hw.priv = (char *)local +
1605                          ((sizeof(struct ieee80211_local) +
1606                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
1607
1608         BUG_ON(!ops->tx);
1609         BUG_ON(!ops->start);
1610         BUG_ON(!ops->stop);
1611         BUG_ON(!ops->config);
1612         BUG_ON(!ops->add_interface);
1613         BUG_ON(!ops->remove_interface);
1614         BUG_ON(!ops->configure_filter);
1615         local->ops = ops;
1616
1617         local->hw.queues = 1; /* default */
1618
1619         local->bridge_packets = 1;
1620
1621         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
1622         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1623         local->short_retry_limit = 7;
1624         local->long_retry_limit = 4;
1625         local->hw.conf.radio_enabled = 1;
1626
1627         INIT_LIST_HEAD(&local->interfaces);
1628
1629         spin_lock_init(&local->key_lock);
1630
1631         INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1632
1633         sta_info_init(local);
1634
1635         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1636                      (unsigned long)local);
1637         tasklet_disable(&local->tx_pending_tasklet);
1638
1639         tasklet_init(&local->tasklet,
1640                      ieee80211_tasklet_handler,
1641                      (unsigned long) local);
1642         tasklet_disable(&local->tasklet);
1643
1644         skb_queue_head_init(&local->skb_queue);
1645         skb_queue_head_init(&local->skb_queue_unreliable);
1646
1647         return local_to_hw(local);
1648 }
1649 EXPORT_SYMBOL(ieee80211_alloc_hw);
1650
1651 int ieee80211_register_hw(struct ieee80211_hw *hw)
1652 {
1653         struct ieee80211_local *local = hw_to_local(hw);
1654         const char *name;
1655         int result;
1656         enum ieee80211_band band;
1657         struct net_device *mdev;
1658         struct ieee80211_sub_if_data *sdata;
1659
1660         /*
1661          * generic code guarantees at least one band,
1662          * set this very early because much code assumes
1663          * that hw.conf.channel is assigned
1664          */
1665         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1666                 struct ieee80211_supported_band *sband;
1667
1668                 sband = local->hw.wiphy->bands[band];
1669                 if (sband) {
1670                         /* init channel we're on */
1671                         local->hw.conf.channel =
1672                         local->oper_channel =
1673                         local->scan_channel = &sband->channels[0];
1674                         break;
1675                 }
1676         }
1677
1678         result = wiphy_register(local->hw.wiphy);
1679         if (result < 0)
1680                 return result;
1681
1682         /*
1683          * We use the number of queues for feature tests (QoS, HT) internally
1684          * so restrict them appropriately.
1685          */
1686 #ifdef CONFIG_MAC80211_QOS
1687         if (hw->queues > IEEE80211_MAX_QUEUES)
1688                 hw->queues = IEEE80211_MAX_QUEUES;
1689         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
1690                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
1691         if (hw->queues < 4)
1692                 hw->ampdu_queues = 0;
1693 #else
1694         hw->queues = 1;
1695         hw->ampdu_queues = 0;
1696 #endif
1697
1698         /* for now, mdev needs sub_if_data :/ */
1699         mdev = alloc_netdev_mq(sizeof(struct ieee80211_sub_if_data),
1700                                "wmaster%d", ether_setup,
1701                                ieee80211_num_queues(hw));
1702         if (!mdev)
1703                 goto fail_mdev_alloc;
1704
1705         if (ieee80211_num_queues(hw) > 1)
1706                 mdev->features |= NETIF_F_MULTI_QUEUE;
1707
1708         sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
1709         mdev->ieee80211_ptr = &sdata->wdev;
1710         sdata->wdev.wiphy = local->hw.wiphy;
1711
1712         local->mdev = mdev;
1713
1714         ieee80211_rx_bss_list_init(mdev);
1715
1716         mdev->hard_start_xmit = ieee80211_master_start_xmit;
1717         mdev->open = ieee80211_master_open;
1718         mdev->stop = ieee80211_master_stop;
1719         mdev->type = ARPHRD_IEEE80211;
1720         mdev->header_ops = &ieee80211_header_ops;
1721         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
1722
1723         sdata->vif.type = IEEE80211_IF_TYPE_AP;
1724         sdata->dev = mdev;
1725         sdata->local = local;
1726         sdata->u.ap.force_unicast_rateidx = -1;
1727         sdata->u.ap.max_ratectrl_rateidx = -1;
1728         ieee80211_if_sdata_init(sdata);
1729
1730         /* no RCU needed since we're still during init phase */
1731         list_add_tail(&sdata->list, &local->interfaces);
1732
1733         name = wiphy_dev(local->hw.wiphy)->driver->name;
1734         local->hw.workqueue = create_freezeable_workqueue(name);
1735         if (!local->hw.workqueue) {
1736                 result = -ENOMEM;
1737                 goto fail_workqueue;
1738         }
1739
1740         /*
1741          * The hardware needs headroom for sending the frame,
1742          * and we need some headroom for passing the frame to monitor
1743          * interfaces, but never both at the same time.
1744          */
1745         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1746                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
1747
1748         debugfs_hw_add(local);
1749
1750         if (local->hw.conf.beacon_int < 10)
1751                 local->hw.conf.beacon_int = 100;
1752
1753         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
1754                                                   IEEE80211_HW_SIGNAL_DB |
1755                                                   IEEE80211_HW_SIGNAL_DBM) ?
1756                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1757         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
1758                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1759         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
1760                 local->wstats_flags |= IW_QUAL_DBM;
1761
1762         result = sta_info_start(local);
1763         if (result < 0)
1764                 goto fail_sta_info;
1765
1766         rtnl_lock();
1767         result = dev_alloc_name(local->mdev, local->mdev->name);
1768         if (result < 0)
1769                 goto fail_dev;
1770
1771         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1772         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1773
1774         result = register_netdevice(local->mdev);
1775         if (result < 0)
1776                 goto fail_dev;
1777
1778         ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1779         ieee80211_if_set_type(local->mdev, IEEE80211_IF_TYPE_AP);
1780
1781         result = ieee80211_init_rate_ctrl_alg(local,
1782                                               hw->rate_control_algorithm);
1783         if (result < 0) {
1784                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1785                        "algorithm\n", wiphy_name(local->hw.wiphy));
1786                 goto fail_rate;
1787         }
1788
1789         result = ieee80211_wep_init(local);
1790
1791         if (result < 0) {
1792                 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1793                        wiphy_name(local->hw.wiphy));
1794                 goto fail_wep;
1795         }
1796
1797         ieee80211_install_qdisc(local->mdev);
1798
1799         /* add one default STA interface */
1800         result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
1801                                   IEEE80211_IF_TYPE_STA, NULL);
1802         if (result)
1803                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1804                        wiphy_name(local->hw.wiphy));
1805
1806         local->reg_state = IEEE80211_DEV_REGISTERED;
1807         rtnl_unlock();
1808
1809         ieee80211_led_init(local);
1810
1811         return 0;
1812
1813 fail_wep:
1814         rate_control_deinitialize(local);
1815 fail_rate:
1816         ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1817         unregister_netdevice(local->mdev);
1818         local->mdev = NULL;
1819 fail_dev:
1820         rtnl_unlock();
1821         sta_info_stop(local);
1822 fail_sta_info:
1823         debugfs_hw_del(local);
1824         destroy_workqueue(local->hw.workqueue);
1825 fail_workqueue:
1826         if (local->mdev != NULL) {
1827                 ieee80211_if_free(local->mdev);
1828                 local->mdev = NULL;
1829         }
1830 fail_mdev_alloc:
1831         wiphy_unregister(local->hw.wiphy);
1832         return result;
1833 }
1834 EXPORT_SYMBOL(ieee80211_register_hw);
1835
1836 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1837 {
1838         struct ieee80211_local *local = hw_to_local(hw);
1839         struct ieee80211_sub_if_data *sdata, *tmp;
1840
1841         tasklet_kill(&local->tx_pending_tasklet);
1842         tasklet_kill(&local->tasklet);
1843
1844         rtnl_lock();
1845
1846         BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
1847
1848         local->reg_state = IEEE80211_DEV_UNREGISTERED;
1849
1850         /*
1851          * At this point, interface list manipulations are fine
1852          * because the driver cannot be handing us frames any
1853          * more and the tasklet is killed.
1854          */
1855
1856         /*
1857          * First, we remove all non-master interfaces. Do this because they
1858          * may have bss pointer dependency on the master, and when we free
1859          * the master these would be freed as well, breaking our list
1860          * iteration completely.
1861          */
1862         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1863                 if (sdata->dev == local->mdev)
1864                         continue;
1865                 list_del(&sdata->list);
1866                 __ieee80211_if_del(local, sdata);
1867         }
1868
1869         /* then, finally, remove the master interface */
1870         __ieee80211_if_del(local, IEEE80211_DEV_TO_SUB_IF(local->mdev));
1871
1872         rtnl_unlock();
1873
1874         ieee80211_rx_bss_list_deinit(local->mdev);
1875         ieee80211_clear_tx_pending(local);
1876         sta_info_stop(local);
1877         rate_control_deinitialize(local);
1878         debugfs_hw_del(local);
1879
1880         if (skb_queue_len(&local->skb_queue)
1881                         || skb_queue_len(&local->skb_queue_unreliable))
1882                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1883                        wiphy_name(local->hw.wiphy));
1884         skb_queue_purge(&local->skb_queue);
1885         skb_queue_purge(&local->skb_queue_unreliable);
1886
1887         destroy_workqueue(local->hw.workqueue);
1888         wiphy_unregister(local->hw.wiphy);
1889         ieee80211_wep_free(local);
1890         ieee80211_led_exit(local);
1891         ieee80211_if_free(local->mdev);
1892         local->mdev = NULL;
1893 }
1894 EXPORT_SYMBOL(ieee80211_unregister_hw);
1895
1896 void ieee80211_free_hw(struct ieee80211_hw *hw)
1897 {
1898         struct ieee80211_local *local = hw_to_local(hw);
1899
1900         wiphy_free(local->hw.wiphy);
1901 }
1902 EXPORT_SYMBOL(ieee80211_free_hw);
1903
1904 static int __init ieee80211_init(void)
1905 {
1906         struct sk_buff *skb;
1907         int ret;
1908
1909         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1910         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1911                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1912
1913         ret = rc80211_pid_init();
1914         if (ret)
1915                 goto out;
1916
1917         ret = ieee80211_wme_register();
1918         if (ret) {
1919                 printk(KERN_DEBUG "ieee80211_init: failed to "
1920                        "initialize WME (err=%d)\n", ret);
1921                 goto out_cleanup_pid;
1922         }
1923
1924         ieee80211_debugfs_netdev_init();
1925
1926         return 0;
1927
1928  out_cleanup_pid:
1929         rc80211_pid_exit();
1930  out:
1931         return ret;
1932 }
1933
1934 static void __exit ieee80211_exit(void)
1935 {
1936         rc80211_pid_exit();
1937
1938         /*
1939          * For key todo, it'll be empty by now but the work
1940          * might still be scheduled.
1941          */
1942         flush_scheduled_work();
1943
1944         if (mesh_allocated)
1945                 ieee80211s_stop();
1946
1947         ieee80211_wme_unregister();
1948         ieee80211_debugfs_netdev_exit();
1949 }
1950
1951
1952 subsys_initcall(ieee80211_init);
1953 module_exit(ieee80211_exit);
1954
1955 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1956 MODULE_LICENSE("GPL");