git.oblomov.eu Git - linux-2.6/blob - net/mac80211/main.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <net/mac80211.h>
  12 #include <net/ieee80211_radiotap.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/types.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/wireless.h>
  22 #include <linux/rtnetlink.h>
  23 #include <linux/bitmap.h>
  24 #include <net/net_namespace.h>
  25 #include <net/cfg80211.h>
  26
  27 #include "ieee80211_i.h"
  28 #include "rate.h"
  29 #include "mesh.h"
  30 #include "wep.h"
  31 #include "wme.h"
  32 #include "aes_ccm.h"
  33 #include "led.h"
  34 #include "cfg.h"
  35 #include "debugfs.h"
  36 #include "debugfs_netdev.h"
  37
  38 /*
  39  * For seeing transmitted packets on monitor interfaces
  40  * we have a radiotap header too.
  41  */
  42 struct ieee80211_tx_status_rtap_hdr {
  43         struct ieee80211_radiotap_header hdr;
  44         __le16 tx_flags;
  45         u8 data_retries;
  46 } __attribute__ ((packed));
  47
  48 /* common interface routines */
  49
  50 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
  51 {
  52         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
  53         return ETH_ALEN;
  54 }
  55
  56 /* must be called under mdev tx lock */
  57 static void ieee80211_configure_filter(struct ieee80211_local *local)
  58 {
  59         unsigned int changed_flags;
  60         unsigned int new_flags = 0;
  61
  62         if (atomic_read(&local->iff_promiscs))
  63                 new_flags |= FIF_PROMISC_IN_BSS;
  64
  65         if (atomic_read(&local->iff_allmultis))
  66                 new_flags |= FIF_ALLMULTI;
  67
  68         if (local->monitors)
  69                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  70
  71         if (local->fif_fcsfail)
  72                 new_flags |= FIF_FCSFAIL;
  73
  74         if (local->fif_plcpfail)
  75                 new_flags |= FIF_PLCPFAIL;
  76
  77         if (local->fif_control)
  78                 new_flags |= FIF_CONTROL;
  79
  80         if (local->fif_other_bss)
  81                 new_flags |= FIF_OTHER_BSS;
  82
  83         changed_flags = local->filter_flags ^ new_flags;
  84
  85         /* be a bit nasty */
  86         new_flags |= (1<<31);
  87
  88         local->ops->configure_filter(local_to_hw(local),
  89                                      changed_flags, &new_flags,
  90                                      local->mdev->mc_count,
  91                                      local->mdev->mc_list);
  92
  93         WARN_ON(new_flags & (1<<31));
  94
  95         local->filter_flags = new_flags & ~(1<<31);
  96 }
  97
  98 /* master interface */
  99
 100 static int ieee80211_master_open(struct net_device *dev)
 101 {
 102         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 103         struct ieee80211_sub_if_data *sdata;
 104         int res = -EOPNOTSUPP;
 105
 106         /* we hold the RTNL here so can safely walk the list */
 107         list_for_each_entry(sdata, &local->interfaces, list) {
 108                 if (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                 printk(KERN_WARNING "%s: invalid MTU %d\n",
 156                        dev->name, new_mtu);
 157                 return -EINVAL;
 158         }
 159
 160 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 161         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
 162 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 163         dev->mtu = new_mtu;
 164         return 0;
 165 }
 166
 167 static inline int identical_mac_addr_allowed(int type1, int type2)
 168 {
 169         return (type1 == IEEE80211_IF_TYPE_MNTR ||
 170                 type2 == IEEE80211_IF_TYPE_MNTR ||
 171                 (type1 == IEEE80211_IF_TYPE_AP &&
 172                  type2 == IEEE80211_IF_TYPE_WDS) ||
 173                 (type1 == IEEE80211_IF_TYPE_WDS &&
 174                  (type2 == IEEE80211_IF_TYPE_WDS ||
 175                   type2 == IEEE80211_IF_TYPE_AP)) ||
 176                 (type1 == IEEE80211_IF_TYPE_AP &&
 177                  type2 == IEEE80211_IF_TYPE_VLAN) ||
 178                 (type1 == IEEE80211_IF_TYPE_VLAN &&
 179                  (type2 == IEEE80211_IF_TYPE_AP ||
 180                   type2 == IEEE80211_IF_TYPE_VLAN)));
 181 }
 182
 183 static int ieee80211_open(struct net_device *dev)
 184 {
 185         struct ieee80211_sub_if_data *sdata, *nsdata;
 186         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 187         struct ieee80211_if_init_conf conf;
 188         int res;
 189         bool need_hw_reconfig = 0;
 190         struct sta_info *sta;
 191
 192         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 193
 194         /* we hold the RTNL here so can safely walk the list */
 195         list_for_each_entry(nsdata, &local->interfaces, list) {
 196                 struct net_device *ndev = nsdata->dev;
 197
 198                 if (ndev != dev && ndev != local->mdev && netif_running(ndev)) {
 199                         /*
 200                          * Allow only a single IBSS interface to be up at any
 201                          * time. This is restricted because beacon distribution
 202                          * cannot work properly if both are in the same IBSS.
 203                          *
 204                          * To remove this restriction we'd have to disallow them
 205                          * from setting the same SSID on different IBSS interfaces
 206                          * belonging to the same hardware. Then, however, we're
 207                          * faced with having to adopt two different TSF timers...
 208                          */
 209                         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
 210                             nsdata->vif.type == IEEE80211_IF_TYPE_IBSS)
 211                                 return -EBUSY;
 212
 213                         /*
 214                          * Disallow multiple IBSS/STA mode interfaces.
 215                          *
 216                          * This is a technical restriction, it is possible although
 217                          * most likely not IEEE 802.11 compliant to have multiple
 218                          * STAs with just a single hardware (the TSF timer will not
 219                          * be adjusted properly.)
 220                          *
 221                          * However, because mac80211 uses the master device's BSS
 222                          * information for each STA/IBSS interface, doing this will
 223                          * currently corrupt that BSS information completely, unless,
 224                          * a not very useful case, both STAs are associated to the
 225                          * same BSS.
 226                          *
 227                          * To remove this restriction, the BSS information needs to
 228                          * be embedded in the STA/IBSS mode sdata instead of using
 229                          * the master device's BSS structure.
 230                          */
 231                         if ((sdata->vif.type == IEEE80211_IF_TYPE_STA ||
 232                              sdata->vif.type == IEEE80211_IF_TYPE_IBSS) &&
 233                             (nsdata->vif.type == IEEE80211_IF_TYPE_STA ||
 234                              nsdata->vif.type == IEEE80211_IF_TYPE_IBSS))
 235                                 return -EBUSY;
 236
 237                         /*
 238                          * The remaining checks are only performed for interfaces
 239                          * with the same MAC address.
 240                          */
 241                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 242                                 continue;
 243
 244                         /*
 245                          * check whether it may have the same address
 246                          */
 247                         if (!identical_mac_addr_allowed(sdata->vif.type,
 248                                                         nsdata->vif.type))
 249                                 return -ENOTUNIQ;
 250
 251                         /*
 252                          * can only add VLANs to enabled APs
 253                          */
 254                         if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN &&
 255                             nsdata->vif.type == IEEE80211_IF_TYPE_AP)
 256                                 sdata->u.vlan.ap = nsdata;
 257                 }
 258         }
 259
 260         switch (sdata->vif.type) {
 261         case IEEE80211_IF_TYPE_WDS:
 262                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 263                         return -ENOLINK;
 264                 break;
 265         case IEEE80211_IF_TYPE_VLAN:
 266                 if (!sdata->u.vlan.ap)
 267                         return -ENOLINK;
 268                 break;
 269         case IEEE80211_IF_TYPE_AP:
 270         case IEEE80211_IF_TYPE_STA:
 271         case IEEE80211_IF_TYPE_MNTR:
 272         case IEEE80211_IF_TYPE_IBSS:
 273         case IEEE80211_IF_TYPE_MESH_POINT:
 274                 /* no special treatment */
 275                 break;
 276         case IEEE80211_IF_TYPE_INVALID:
 277                 /* cannot happen */
 278                 WARN_ON(1);
 279                 break;
 280         }
 281
 282         if (local->open_count == 0) {
 283                 res = 0;
 284                 if (local->ops->start)
 285                         res = local->ops->start(local_to_hw(local));
 286                 if (res)
 287                         return res;
 288                 need_hw_reconfig = 1;
 289                 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
 290         }
 291
 292         switch (sdata->vif.type) {
 293         case IEEE80211_IF_TYPE_VLAN:
 294                 list_add(&sdata->u.vlan.list, &sdata->u.vlan.ap->u.ap.vlans);
 295                 /* no need to tell driver */
 296                 break;
 297         case IEEE80211_IF_TYPE_MNTR:
 298                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 299                         local->cooked_mntrs++;
 300                         break;
 301                 }
 302
 303                 /* must be before the call to ieee80211_configure_filter */
 304                 local->monitors++;
 305                 if (local->monitors == 1)
 306                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 307
 308                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 309                         local->fif_fcsfail++;
 310                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 311                         local->fif_plcpfail++;
 312                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 313                         local->fif_control++;
 314                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 315                         local->fif_other_bss++;
 316
 317                 netif_tx_lock_bh(local->mdev);
 318                 ieee80211_configure_filter(local);
 319                 netif_tx_unlock_bh(local->mdev);
 320                 break;
 321         case IEEE80211_IF_TYPE_STA:
 322         case IEEE80211_IF_TYPE_IBSS:
 323                 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
 324                 /* fall through */
 325         default:
 326                 conf.vif = &sdata->vif;
 327                 conf.type = sdata->vif.type;
 328                 conf.mac_addr = dev->dev_addr;
 329                 res = local->ops->add_interface(local_to_hw(local), &conf);
 330                 if (res)
 331                         goto err_stop;
 332
 333                 ieee80211_if_config(dev);
 334                 ieee80211_reset_erp_info(dev);
 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                 del_timer_sync(&sdata->u.sta.timer);
 520                 /*
 521                  * When we get here, the interface is marked down.
 522                  * Call synchronize_rcu() to wait for the RX path
 523                  * should it be using the interface and enqueuing
 524                  * frames at this very time on another CPU.
 525                  */
 526                 synchronize_rcu();
 527                 skb_queue_purge(&sdata->u.sta.skb_queue);
 528
 529                 if (local->scan_dev == sdata->dev) {
 530                         if (!local->ops->hw_scan) {
 531                                 local->sta_sw_scanning = 0;
 532                                 cancel_delayed_work(&local->scan_work);
 533                         } else
 534                                 local->sta_hw_scanning = 0;
 535                 }
 536
 537                 flush_workqueue(local->hw.workqueue);
 538
 539                 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
 540                 kfree(sdata->u.sta.extra_ie);
 541                 sdata->u.sta.extra_ie = NULL;
 542                 sdata->u.sta.extra_ie_len = 0;
 543                 /* fall through */
 544         default:
 545                 conf.vif = &sdata->vif;
 546                 conf.type = sdata->vif.type;
 547                 conf.mac_addr = dev->dev_addr;
 548                 /* disable all keys for as long as this netdev is down */
 549                 ieee80211_disable_keys(sdata);
 550                 local->ops->remove_interface(local_to_hw(local), &conf);
 551         }
 552
 553         if (local->open_count == 0) {
 554                 if (netif_running(local->mdev))
 555                         dev_close(local->mdev);
 556
 557                 if (local->ops->stop)
 558                         local->ops->stop(local_to_hw(local));
 559
 560                 ieee80211_led_radio(local, 0);
 561
 562                 tasklet_disable(&local->tx_pending_tasklet);
 563                 tasklet_disable(&local->tasklet);
 564         }
 565
 566         return 0;
 567 }
 568
 569 int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid)
 570 {
 571         struct ieee80211_local *local = hw_to_local(hw);
 572         struct sta_info *sta;
 573         struct ieee80211_sub_if_data *sdata;
 574         u16 start_seq_num = 0;
 575         u8 *state;
 576         int ret;
 577         DECLARE_MAC_BUF(mac);
 578
 579         if (tid >= STA_TID_NUM)
 580                 return -EINVAL;
 581
 582 #ifdef CONFIG_MAC80211_HT_DEBUG
 583         printk(KERN_DEBUG "Open BA session requested for %s tid %u\n",
 584                                 print_mac(mac, ra), tid);
 585 #endif /* CONFIG_MAC80211_HT_DEBUG */
 586
 587         rcu_read_lock();
 588
 589         sta = sta_info_get(local, ra);
 590         if (!sta) {
 591                 printk(KERN_DEBUG "Could not find the station\n");
 592                 rcu_read_unlock();
 593                 return -ENOENT;
 594         }
 595
 596         spin_lock_bh(&sta->lock);
 597
 598         /* we have tried too many times, receiver does not want A-MPDU */
 599         if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
 600                 ret = -EBUSY;
 601                 goto start_ba_exit;
 602         }
 603
 604         state = &sta->ampdu_mlme.tid_state_tx[tid];
 605         /* check if the TID is not in aggregation flow already */
 606         if (*state != HT_AGG_STATE_IDLE) {
 607 #ifdef CONFIG_MAC80211_HT_DEBUG
 608                 printk(KERN_DEBUG "BA request denied - session is not "
 609                                  "idle on tid %u\n", tid);
 610 #endif /* CONFIG_MAC80211_HT_DEBUG */
 611                 ret = -EAGAIN;
 612                 goto start_ba_exit;
 613         }
 614
 615         /* prepare A-MPDU MLME for Tx aggregation */
 616         sta->ampdu_mlme.tid_tx[tid] =
 617                         kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
 618         if (!sta->ampdu_mlme.tid_tx[tid]) {
 619                 if (net_ratelimit())
 620                         printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
 621                                         tid);
 622                 ret = -ENOMEM;
 623                 goto start_ba_exit;
 624         }
 625         /* Tx timer */
 626         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function =
 627                         sta_addba_resp_timer_expired;
 628         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data =
 629                         (unsigned long)&sta->timer_to_tid[tid];
 630         init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
 631
 632         /* ensure that TX flow won't interrupt us
 633          * until the end of the call to requeue function */
 634         spin_lock_bh(&local->mdev->queue_lock);
 635
 636         /* create a new queue for this aggregation */
 637         ret = ieee80211_ht_agg_queue_add(local, sta, tid);
 638
 639         /* case no queue is available to aggregation
 640          * don't switch to aggregation */
 641         if (ret) {
 642 #ifdef CONFIG_MAC80211_HT_DEBUG
 643                 printk(KERN_DEBUG "BA request denied - queue unavailable for"
 644                                         " tid %d\n", tid);
 645 #endif /* CONFIG_MAC80211_HT_DEBUG */
 646                 goto start_ba_err;
 647         }
 648         sdata = sta->sdata;
 649
 650         /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
 651          * call back right away, it must see that the flow has begun */
 652         *state |= HT_ADDBA_REQUESTED_MSK;
 653
 654         if (local->ops->ampdu_action)
 655                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
 656                                                 ra, tid, &start_seq_num);
 657
 658         if (ret) {
 659                 /* No need to requeue the packets in the agg queue, since we
 660                  * held the tx lock: no packet could be enqueued to the newly
 661                  * allocated queue */
 662                  ieee80211_ht_agg_queue_remove(local, sta, tid, 0);
 663 #ifdef CONFIG_MAC80211_HT_DEBUG
 664                 printk(KERN_DEBUG "BA request denied - HW unavailable for"
 665                                         " tid %d\n", tid);
 666 #endif /* CONFIG_MAC80211_HT_DEBUG */
 667                 *state = HT_AGG_STATE_IDLE;
 668                 goto start_ba_err;
 669         }
 670
 671         /* Will put all the packets in the new SW queue */
 672         ieee80211_requeue(local, ieee802_1d_to_ac[tid]);
 673         spin_unlock_bh(&local->mdev->queue_lock);
 674
 675         /* send an addBA request */
 676         sta->ampdu_mlme.dialog_token_allocator++;
 677         sta->ampdu_mlme.tid_tx[tid]->dialog_token =
 678                         sta->ampdu_mlme.dialog_token_allocator;
 679         sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
 680
 681         ieee80211_send_addba_request(sta->sdata->dev, ra, tid,
 682                          sta->ampdu_mlme.tid_tx[tid]->dialog_token,
 683                          sta->ampdu_mlme.tid_tx[tid]->ssn,
 684                          0x40, 5000);
 685
 686         /* activate the timer for the recipient's addBA response */
 687         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
 688                                 jiffies + ADDBA_RESP_INTERVAL;
 689         add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
 690         printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
 691         goto start_ba_exit;
 692
 693 start_ba_err:
 694         kfree(sta->ampdu_mlme.tid_tx[tid]);
 695         sta->ampdu_mlme.tid_tx[tid] = NULL;
 696         spin_unlock_bh(&local->mdev->queue_lock);
 697         ret = -EBUSY;
 698 start_ba_exit:
 699         spin_unlock_bh(&sta->lock);
 700         rcu_read_unlock();
 701         return ret;
 702 }
 703 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
 704
 705 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
 706                                  u8 *ra, u16 tid,
 707                                  enum ieee80211_back_parties initiator)
 708 {
 709         struct ieee80211_local *local = hw_to_local(hw);
 710         struct sta_info *sta;
 711         u8 *state;
 712         int ret = 0;
 713         DECLARE_MAC_BUF(mac);
 714
 715         if (tid >= STA_TID_NUM)
 716                 return -EINVAL;
 717
 718         rcu_read_lock();
 719         sta = sta_info_get(local, ra);
 720         if (!sta) {
 721                 rcu_read_unlock();
 722                 return -ENOENT;
 723         }
 724
 725         /* check if the TID is in aggregation */
 726         state = &sta->ampdu_mlme.tid_state_tx[tid];
 727         spin_lock_bh(&sta->lock);
 728
 729         if (*state != HT_AGG_STATE_OPERATIONAL) {
 730                 ret = -ENOENT;
 731                 goto stop_BA_exit;
 732         }
 733
 734 #ifdef CONFIG_MAC80211_HT_DEBUG
 735         printk(KERN_DEBUG "Tx BA session stop requested for %s tid %u\n",
 736                                 print_mac(mac, ra), tid);
 737 #endif /* CONFIG_MAC80211_HT_DEBUG */
 738
 739         ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]);
 740
 741         *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
 742                 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
 743
 744         if (local->ops->ampdu_action)
 745                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP,
 746                                                 ra, tid, NULL);
 747
 748         /* case HW denied going back to legacy */
 749         if (ret) {
 750                 WARN_ON(ret != -EBUSY);
 751                 *state = HT_AGG_STATE_OPERATIONAL;
 752                 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
 753                 goto stop_BA_exit;
 754         }
 755
 756 stop_BA_exit:
 757         spin_unlock_bh(&sta->lock);
 758         rcu_read_unlock();
 759         return ret;
 760 }
 761 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
 762
 763 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
 764 {
 765         struct ieee80211_local *local = hw_to_local(hw);
 766         struct sta_info *sta;
 767         u8 *state;
 768         DECLARE_MAC_BUF(mac);
 769
 770         if (tid >= STA_TID_NUM) {
 771                 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
 772                                 tid, STA_TID_NUM);
 773                 return;
 774         }
 775
 776         rcu_read_lock();
 777         sta = sta_info_get(local, ra);
 778         if (!sta) {
 779                 rcu_read_unlock();
 780                 printk(KERN_DEBUG "Could not find station: %s\n",
 781                                 print_mac(mac, ra));
 782                 return;
 783         }
 784
 785         state = &sta->ampdu_mlme.tid_state_tx[tid];
 786         spin_lock_bh(&sta->lock);
 787
 788         if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
 789                 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
 790                                 *state);
 791                 spin_unlock_bh(&sta->lock);
 792                 rcu_read_unlock();
 793                 return;
 794         }
 795
 796         WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK);
 797
 798         *state |= HT_ADDBA_DRV_READY_MSK;
 799
 800         if (*state == HT_AGG_STATE_OPERATIONAL) {
 801                 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
 802                 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
 803         }
 804         spin_unlock_bh(&sta->lock);
 805         rcu_read_unlock();
 806 }
 807 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
 808
 809 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
 810 {
 811         struct ieee80211_local *local = hw_to_local(hw);
 812         struct sta_info *sta;
 813         u8 *state;
 814         int agg_queue;
 815         DECLARE_MAC_BUF(mac);
 816
 817         if (tid >= STA_TID_NUM) {
 818                 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
 819                                 tid, STA_TID_NUM);
 820                 return;
 821         }
 822
 823 #ifdef CONFIG_MAC80211_HT_DEBUG
 824         printk(KERN_DEBUG "Stopping Tx BA session for %s tid %d\n",
 825                                 print_mac(mac, ra), tid);
 826 #endif /* CONFIG_MAC80211_HT_DEBUG */
 827
 828         rcu_read_lock();
 829         sta = sta_info_get(local, ra);
 830         if (!sta) {
 831                 printk(KERN_DEBUG "Could not find station: %s\n",
 832                                 print_mac(mac, ra));
 833                 rcu_read_unlock();
 834                 return;
 835         }
 836         state = &sta->ampdu_mlme.tid_state_tx[tid];
 837
 838         spin_lock_bh(&sta->lock);
 839         if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
 840                 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
 841                 spin_unlock_bh(&sta->lock);
 842                 rcu_read_unlock();
 843                 return;
 844         }
 845
 846         if (*state & HT_AGG_STATE_INITIATOR_MSK)
 847                 ieee80211_send_delba(sta->sdata->dev, ra, tid,
 848                         WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
 849
 850         agg_queue = sta->tid_to_tx_q[tid];
 851
 852         /* avoid ordering issues: we are the only one that can modify
 853          * the content of the qdiscs */
 854         spin_lock_bh(&local->mdev->queue_lock);
 855         /* remove the queue for this aggregation */
 856         ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
 857         spin_unlock_bh(&local->mdev->queue_lock);
 858
 859         /* we just requeued the all the frames that were in the removed
 860          * queue, and since we might miss a softirq we do netif_schedule.
 861          * ieee80211_wake_queue is not used here as this queue is not
 862          * necessarily stopped */
 863         netif_schedule(local->mdev);
 864         *state = HT_AGG_STATE_IDLE;
 865         sta->ampdu_mlme.addba_req_num[tid] = 0;
 866         kfree(sta->ampdu_mlme.tid_tx[tid]);
 867         sta->ampdu_mlme.tid_tx[tid] = NULL;
 868         spin_unlock_bh(&sta->lock);
 869
 870         rcu_read_unlock();
 871 }
 872 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
 873
 874 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
 875                                       const u8 *ra, u16 tid)
 876 {
 877         struct ieee80211_local *local = hw_to_local(hw);
 878         struct ieee80211_ra_tid *ra_tid;
 879         struct sk_buff *skb = dev_alloc_skb(0);
 880
 881         if (unlikely(!skb)) {
 882                 if (net_ratelimit())
 883                         printk(KERN_WARNING "%s: Not enough memory, "
 884                                "dropping start BA session", skb->dev->name);
 885                 return;
 886         }
 887         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 888         memcpy(&ra_tid->ra, ra, ETH_ALEN);
 889         ra_tid->tid = tid;
 890
 891         skb->pkt_type = IEEE80211_ADDBA_MSG;
 892         skb_queue_tail(&local->skb_queue, skb);
 893         tasklet_schedule(&local->tasklet);
 894 }
 895 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
 896
 897 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
 898                                      const u8 *ra, u16 tid)
 899 {
 900         struct ieee80211_local *local = hw_to_local(hw);
 901         struct ieee80211_ra_tid *ra_tid;
 902         struct sk_buff *skb = dev_alloc_skb(0);
 903
 904         if (unlikely(!skb)) {
 905                 if (net_ratelimit())
 906                         printk(KERN_WARNING "%s: Not enough memory, "
 907                                "dropping stop BA session", skb->dev->name);
 908                 return;
 909         }
 910         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 911         memcpy(&ra_tid->ra, ra, ETH_ALEN);
 912         ra_tid->tid = tid;
 913
 914         skb->pkt_type = IEEE80211_DELBA_MSG;
 915         skb_queue_tail(&local->skb_queue, skb);
 916         tasklet_schedule(&local->tasklet);
 917 }
 918 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
 919
 920 static void ieee80211_set_multicast_list(struct net_device *dev)
 921 {
 922         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 923         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 924         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 925
 926         allmulti = !!(dev->flags & IFF_ALLMULTI);
 927         promisc = !!(dev->flags & IFF_PROMISC);
 928         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 929         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 930
 931         if (allmulti != sdata_allmulti) {
 932                 if (dev->flags & IFF_ALLMULTI)
 933                         atomic_inc(&local->iff_allmultis);
 934                 else
 935                         atomic_dec(&local->iff_allmultis);
 936                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 937         }
 938
 939         if (promisc != sdata_promisc) {
 940                 if (dev->flags & IFF_PROMISC)
 941                         atomic_inc(&local->iff_promiscs);
 942                 else
 943                         atomic_dec(&local->iff_promiscs);
 944                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 945         }
 946
 947         dev_mc_sync(local->mdev, dev);
 948 }
 949
 950 static const struct header_ops ieee80211_header_ops = {
 951         .create         = eth_header,
 952         .parse          = header_parse_80211,
 953         .rebuild        = eth_rebuild_header,
 954         .cache          = eth_header_cache,
 955         .cache_update   = eth_header_cache_update,
 956 };
 957
 958 /* Must not be called for mdev */
 959 void ieee80211_if_setup(struct net_device *dev)
 960 {
 961         ether_setup(dev);
 962         dev->hard_start_xmit = ieee80211_subif_start_xmit;
 963         dev->wireless_handlers = &ieee80211_iw_handler_def;
 964         dev->set_multicast_list = ieee80211_set_multicast_list;
 965         dev->change_mtu = ieee80211_change_mtu;
 966         dev->open = ieee80211_open;
 967         dev->stop = ieee80211_stop;
 968         dev->destructor = ieee80211_if_free;
 969 }
 970
 971 /* everything else */
 972
 973 static int __ieee80211_if_config(struct net_device *dev,
 974                                  struct sk_buff *beacon,
 975                                  struct ieee80211_tx_control *control)
 976 {
 977         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 978         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 979         struct ieee80211_if_conf conf;
 980
 981         if (!local->ops->config_interface || !netif_running(dev))
 982                 return 0;
 983
 984         memset(&conf, 0, sizeof(conf));
 985         conf.type = sdata->vif.type;
 986         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
 987             sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
 988                 conf.bssid = sdata->u.sta.bssid;
 989                 conf.ssid = sdata->u.sta.ssid;
 990                 conf.ssid_len = sdata->u.sta.ssid_len;
 991         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 992                 conf.beacon = beacon;
 993                 conf.beacon_control = control;
 994                 ieee80211_start_mesh(dev);
 995         } else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
 996                 conf.ssid = sdata->u.ap.ssid;
 997                 conf.ssid_len = sdata->u.ap.ssid_len;
 998                 conf.beacon = beacon;
 999                 conf.beacon_control = control;
1000         }
1001         return local->ops->config_interface(local_to_hw(local),
1002                                             &sdata->vif, &conf);
1003 }
1004
1005 int ieee80211_if_config(struct net_device *dev)
1006 {
1007         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1008         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1009         if (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT &&
1010             (local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
1011                 return ieee80211_if_config_beacon(dev);
1012         return __ieee80211_if_config(dev, NULL, NULL);
1013 }
1014
1015 int ieee80211_if_config_beacon(struct net_device *dev)
1016 {
1017         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1018         struct ieee80211_tx_control control;
1019         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1020         struct sk_buff *skb;
1021
1022         if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
1023                 return 0;
1024         skb = ieee80211_beacon_get(local_to_hw(local), &sdata->vif,
1025                                    &control);
1026         if (!skb)
1027                 return -ENOMEM;
1028         return __ieee80211_if_config(dev, skb, &control);
1029 }
1030
1031 int ieee80211_hw_config(struct ieee80211_local *local)
1032 {
1033         struct ieee80211_channel *chan;
1034         int ret = 0;
1035
1036         if (local->sta_sw_scanning)
1037                 chan = local->scan_channel;
1038         else
1039                 chan = local->oper_channel;
1040
1041         local->hw.conf.channel = chan;
1042
1043         if (!local->hw.conf.power_level)
1044                 local->hw.conf.power_level = chan->max_power;
1045         else
1046                 local->hw.conf.power_level = min(chan->max_power,
1047                                                local->hw.conf.power_level);
1048
1049         local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
1050
1051 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1052         printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
1053                wiphy_name(local->hw.wiphy), chan->center_freq);
1054 #endif
1055
1056         if (local->open_count)
1057                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
1058
1059         return ret;
1060 }
1061
1062 /**
1063  * ieee80211_handle_ht should be used only after legacy configuration
1064  * has been determined namely band, as ht configuration depends upon
1065  * the hardware's HT abilities for a _specific_ band.
1066  */
1067 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
1068                            struct ieee80211_ht_info *req_ht_cap,
1069                            struct ieee80211_ht_bss_info *req_bss_cap)
1070 {
1071         struct ieee80211_conf *conf = &local->hw.conf;
1072         struct ieee80211_supported_band *sband;
1073         struct ieee80211_ht_info ht_conf;
1074         struct ieee80211_ht_bss_info ht_bss_conf;
1075         u32 changed = 0;
1076         int i;
1077         u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS;
1078         u8 tx_mcs_set_cap;
1079
1080         sband = local->hw.wiphy->bands[conf->channel->band];
1081
1082         memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
1083         memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
1084
1085         /* HT is not supported */
1086         if (!sband->ht_info.ht_supported) {
1087                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1088                 goto out;
1089         }
1090
1091         /* disable HT */
1092         if (!enable_ht) {
1093                 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
1094                         changed |= BSS_CHANGED_HT;
1095                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1096                 conf->ht_conf.ht_supported = 0;
1097                 goto out;
1098         }
1099
1100
1101         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
1102                 changed |= BSS_CHANGED_HT;
1103
1104         conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
1105         ht_conf.ht_supported = 1;
1106
1107         ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
1108         ht_conf.cap &= ~(IEEE80211_HT_CAP_MIMO_PS);
1109         ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_MIMO_PS;
1110         ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
1111         ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
1112         ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
1113
1114         ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
1115         ht_conf.ampdu_density = req_ht_cap->ampdu_density;
1116
1117         /* Bits 96-100 */
1118         tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12];
1119
1120         /* configure suppoerted Tx MCS according to requested MCS
1121          * (based in most cases on Rx capabilities of peer) and self
1122          * Tx MCS capabilities (as defined by low level driver HW
1123          * Tx capabilities) */
1124         if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED))
1125                 goto check_changed;
1126
1127         /* Counting from 0 therfore + 1 */
1128         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF)
1129                 max_tx_streams = ((tx_mcs_set_cap &
1130                                 IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1;
1131
1132         for (i = 0; i < max_tx_streams; i++)
1133                 ht_conf.supp_mcs_set[i] =
1134                         sband->ht_info.supp_mcs_set[i] &
1135                                         req_ht_cap->supp_mcs_set[i];
1136
1137         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM)
1138                 for (i = IEEE80211_SUPP_MCS_SET_UEQM;
1139                      i < IEEE80211_SUPP_MCS_SET_LEN; i++)
1140                         ht_conf.supp_mcs_set[i] =
1141                                 sband->ht_info.supp_mcs_set[i] &
1142                                         req_ht_cap->supp_mcs_set[i];
1143
1144 check_changed:
1145         /* if bss configuration changed store the new one */
1146         if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
1147             memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
1148                 changed |= BSS_CHANGED_HT;
1149                 memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
1150                 memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
1151         }
1152 out:
1153         return changed;
1154 }
1155
1156 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1157                                       u32 changed)
1158 {
1159         struct ieee80211_local *local = sdata->local;
1160
1161         if (!changed)
1162                 return;
1163
1164         if (local->ops->bss_info_changed)
1165                 local->ops->bss_info_changed(local_to_hw(local),
1166                                              &sdata->vif,
1167                                              &sdata->bss_conf,
1168                                              changed);
1169 }
1170
1171 void ieee80211_reset_erp_info(struct net_device *dev)
1172 {
1173         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1174
1175         sdata->bss_conf.use_cts_prot = 0;
1176         sdata->bss_conf.use_short_preamble = 0;
1177         ieee80211_bss_info_change_notify(sdata,
1178                                          BSS_CHANGED_ERP_CTS_PROT |
1179                                          BSS_CHANGED_ERP_PREAMBLE);
1180 }
1181
1182 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
1183                                  struct sk_buff *skb,
1184                                  struct ieee80211_tx_status *status)
1185 {
1186         struct ieee80211_local *local = hw_to_local(hw);
1187         struct ieee80211_tx_status *saved;
1188         int tmp;
1189
1190         skb->dev = local->mdev;
1191         saved = kmalloc(sizeof(struct ieee80211_tx_status), GFP_ATOMIC);
1192         if (unlikely(!saved)) {
1193                 if (net_ratelimit())
1194                         printk(KERN_WARNING "%s: Not enough memory, "
1195                                "dropping tx status", skb->dev->name);
1196                 /* should be dev_kfree_skb_irq, but due to this function being
1197                  * named _irqsafe instead of just _irq we can't be sure that
1198                  * people won't call it from non-irq contexts */
1199                 dev_kfree_skb_any(skb);
1200                 return;
1201         }
1202         memcpy(saved, status, sizeof(struct ieee80211_tx_status));
1203         /* copy pointer to saved status into skb->cb for use by tasklet */
1204         memcpy(skb->cb, &saved, sizeof(saved));
1205
1206         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
1207         skb_queue_tail(status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS ?
1208                        &local->skb_queue : &local->skb_queue_unreliable, skb);
1209         tmp = skb_queue_len(&local->skb_queue) +
1210                 skb_queue_len(&local->skb_queue_unreliable);
1211         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
1212                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1213                 memcpy(&saved, skb->cb, sizeof(saved));
1214                 kfree(saved);
1215                 dev_kfree_skb_irq(skb);
1216                 tmp--;
1217                 I802_DEBUG_INC(local->tx_status_drop);
1218         }
1219         tasklet_schedule(&local->tasklet);
1220 }
1221 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
1222
1223 static void ieee80211_tasklet_handler(unsigned long data)
1224 {
1225         struct ieee80211_local *local = (struct ieee80211_local *) data;
1226         struct sk_buff *skb;
1227         struct ieee80211_rx_status rx_status;
1228         struct ieee80211_tx_status *tx_status;
1229         struct ieee80211_ra_tid *ra_tid;
1230
1231         while ((skb = skb_dequeue(&local->skb_queue)) ||
1232                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1233                 switch (skb->pkt_type) {
1234                 case IEEE80211_RX_MSG:
1235                         /* status is in skb->cb */
1236                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
1237                         /* Clear skb->pkt_type in order to not confuse kernel
1238                          * netstack. */
1239                         skb->pkt_type = 0;
1240                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
1241                         break;
1242                 case IEEE80211_TX_STATUS_MSG:
1243                         /* get pointer to saved status out of skb->cb */
1244                         memcpy(&tx_status, skb->cb, sizeof(tx_status));
1245                         skb->pkt_type = 0;
1246                         ieee80211_tx_status(local_to_hw(local),
1247                                             skb, tx_status);
1248                         kfree(tx_status);
1249                         break;
1250                 case IEEE80211_DELBA_MSG:
1251                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1252                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
1253                                                 ra_tid->ra, ra_tid->tid);
1254                         dev_kfree_skb(skb);
1255                         break;
1256                 case IEEE80211_ADDBA_MSG:
1257                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1258                         ieee80211_start_tx_ba_cb(local_to_hw(local),
1259                                                  ra_tid->ra, ra_tid->tid);
1260                         dev_kfree_skb(skb);
1261                         break ;
1262                 default: /* should never get here! */
1263                         printk(KERN_ERR "%s: Unknown message type (%d)\n",
1264                                wiphy_name(local->hw.wiphy), skb->pkt_type);
1265                         dev_kfree_skb(skb);
1266                         break;
1267                 }
1268         }
1269 }
1270
1271 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
1272  * make a prepared TX frame (one that has been given to hw) to look like brand
1273  * new IEEE 802.11 frame that is ready to go through TX processing again.
1274  * Also, tx_packet_data in cb is restored from tx_control. */
1275 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
1276                                       struct ieee80211_key *key,
1277                                       struct sk_buff *skb,
1278                                       struct ieee80211_tx_control *control)
1279 {
1280         int hdrlen, iv_len, mic_len;
1281         struct ieee80211_tx_packet_data *pkt_data;
1282
1283         pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1284         pkt_data->ifindex = vif_to_sdata(control->vif)->dev->ifindex;
1285         pkt_data->flags = 0;
1286         if (control->flags & IEEE80211_TXCTL_REQ_TX_STATUS)
1287                 pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
1288         if (control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT)
1289                 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1290         if (control->flags & IEEE80211_TXCTL_REQUEUE)
1291                 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
1292         if (control->flags & IEEE80211_TXCTL_EAPOL_FRAME)
1293                 pkt_data->flags |= IEEE80211_TXPD_EAPOL_FRAME;
1294         pkt_data->queue = control->queue;
1295
1296         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1297
1298         if (!key)
1299                 goto no_key;
1300
1301         switch (key->conf.alg) {
1302         case ALG_WEP:
1303                 iv_len = WEP_IV_LEN;
1304                 mic_len = WEP_ICV_LEN;
1305                 break;
1306         case ALG_TKIP:
1307                 iv_len = TKIP_IV_LEN;
1308                 mic_len = TKIP_ICV_LEN;
1309                 break;
1310         case ALG_CCMP:
1311                 iv_len = CCMP_HDR_LEN;
1312                 mic_len = CCMP_MIC_LEN;
1313                 break;
1314         default:
1315                 goto no_key;
1316         }
1317
1318         if (skb->len >= mic_len &&
1319             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
1320                 skb_trim(skb, skb->len - mic_len);
1321         if (skb->len >= iv_len && skb->len > hdrlen) {
1322                 memmove(skb->data + iv_len, skb->data, hdrlen);
1323                 skb_pull(skb, iv_len);
1324         }
1325
1326 no_key:
1327         {
1328                 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1329                 u16 fc = le16_to_cpu(hdr->frame_control);
1330                 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
1331                         fc &= ~IEEE80211_STYPE_QOS_DATA;
1332                         hdr->frame_control = cpu_to_le16(fc);
1333                         memmove(skb->data + 2, skb->data, hdrlen - 2);
1334                         skb_pull(skb, 2);
1335                 }
1336         }
1337 }
1338
1339 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
1340                                             struct sta_info *sta,
1341                                             struct sk_buff *skb,
1342                                             struct ieee80211_tx_status *status)
1343 {
1344         sta->tx_filtered_count++;
1345
1346         /*
1347          * Clear the TX filter mask for this STA when sending the next
1348          * packet. If the STA went to power save mode, this will happen
1349          * happen when it wakes up for the next time.
1350          */
1351         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
1352
1353         /*
1354          * This code races in the following way:
1355          *
1356          *  (1) STA sends frame indicating it will go to sleep and does so
1357          *  (2) hardware/firmware adds STA to filter list, passes frame up
1358          *  (3) hardware/firmware processes TX fifo and suppresses a frame
1359          *  (4) we get TX status before having processed the frame and
1360          *      knowing that the STA has gone to sleep.
1361          *
1362          * This is actually quite unlikely even when both those events are
1363          * processed from interrupts coming in quickly after one another or
1364          * even at the same time because we queue both TX status events and
1365          * RX frames to be processed by a tasklet and process them in the
1366          * same order that they were received or TX status last. Hence, there
1367          * is no race as long as the frame RX is processed before the next TX
1368          * status, which drivers can ensure, see below.
1369          *
1370          * Note that this can only happen if the hardware or firmware can
1371          * actually add STAs to the filter list, if this is done by the
1372          * driver in response to set_tim() (which will only reduce the race
1373          * this whole filtering tries to solve, not completely solve it)
1374          * this situation cannot happen.
1375          *
1376          * To completely solve this race drivers need to make sure that they
1377          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
1378          *      functions and
1379          *  (b) always process RX events before TX status events if ordering
1380          *      can be unknown, for example with different interrupt status
1381          *      bits.
1382          */
1383         if (test_sta_flags(sta, WLAN_STA_PS) &&
1384             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
1385                 ieee80211_remove_tx_extra(local, sta->key, skb,
1386                                           &status->control);
1387                 skb_queue_tail(&sta->tx_filtered, skb);
1388                 return;
1389         }
1390
1391         if (!test_sta_flags(sta, WLAN_STA_PS) &&
1392             !(status->control.flags & IEEE80211_TXCTL_REQUEUE)) {
1393                 /* Software retry the packet once */
1394                 status->control.flags |= IEEE80211_TXCTL_REQUEUE;
1395                 ieee80211_remove_tx_extra(local, sta->key, skb,
1396                                           &status->control);
1397                 dev_queue_xmit(skb);
1398                 return;
1399         }
1400
1401         if (net_ratelimit())
1402                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
1403                        "queue_len=%d PS=%d @%lu\n",
1404                        wiphy_name(local->hw.wiphy),
1405                        skb_queue_len(&sta->tx_filtered),
1406                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
1407         dev_kfree_skb(skb);
1408 }
1409
1410 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
1411                          struct ieee80211_tx_status *status)
1412 {
1413         struct sk_buff *skb2;
1414         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1415         struct ieee80211_local *local = hw_to_local(hw);
1416         u16 frag, type;
1417         struct ieee80211_tx_status_rtap_hdr *rthdr;
1418         struct ieee80211_sub_if_data *sdata;
1419         struct net_device *prev_dev = NULL;
1420
1421         if (!status) {
1422                 printk(KERN_ERR
1423                        "%s: ieee80211_tx_status called with NULL status\n",
1424                        wiphy_name(local->hw.wiphy));
1425                 dev_kfree_skb(skb);
1426                 return;
1427         }
1428
1429         rcu_read_lock();
1430
1431         if (status->excessive_retries) {
1432                 struct sta_info *sta;
1433                 sta = sta_info_get(local, hdr->addr1);
1434                 if (sta) {
1435                         if (test_sta_flags(sta, WLAN_STA_PS)) {
1436                                 /*
1437                                  * The STA is in power save mode, so assume
1438                                  * that this TX packet failed because of that.
1439                                  */
1440                                 status->excessive_retries = 0;
1441                                 status->flags |= IEEE80211_TX_STATUS_TX_FILTERED;
1442                                 ieee80211_handle_filtered_frame(local, sta,
1443                                                                 skb, status);
1444                                 rcu_read_unlock();
1445                                 return;
1446                         }
1447                 }
1448         }
1449
1450         if (status->flags & IEEE80211_TX_STATUS_TX_FILTERED) {
1451                 struct sta_info *sta;
1452                 sta = sta_info_get(local, hdr->addr1);
1453                 if (sta) {
1454                         ieee80211_handle_filtered_frame(local, sta, skb,
1455                                                         status);
1456                         rcu_read_unlock();
1457                         return;
1458                 }
1459         } else
1460                 rate_control_tx_status(local->mdev, skb, status);
1461
1462         rcu_read_unlock();
1463
1464         ieee80211_led_tx(local, 0);
1465
1466         /* SNMP counters
1467          * Fragments are passed to low-level drivers as separate skbs, so these
1468          * are actually fragments, not frames. Update frame counters only for
1469          * the first fragment of the frame. */
1470
1471         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
1472         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
1473
1474         if (status->flags & IEEE80211_TX_STATUS_ACK) {
1475                 if (frag == 0) {
1476                         local->dot11TransmittedFrameCount++;
1477                         if (is_multicast_ether_addr(hdr->addr1))
1478                                 local->dot11MulticastTransmittedFrameCount++;
1479                         if (status->retry_count > 0)
1480                                 local->dot11RetryCount++;
1481                         if (status->retry_count > 1)
1482                                 local->dot11MultipleRetryCount++;
1483                 }
1484
1485                 /* This counter shall be incremented for an acknowledged MPDU
1486                  * with an individual address in the address 1 field or an MPDU
1487                  * with a multicast address in the address 1 field of type Data
1488                  * or Management. */
1489                 if (!is_multicast_ether_addr(hdr->addr1) ||
1490                     type == IEEE80211_FTYPE_DATA ||
1491                     type == IEEE80211_FTYPE_MGMT)
1492                         local->dot11TransmittedFragmentCount++;
1493         } else {
1494                 if (frag == 0)
1495                         local->dot11FailedCount++;
1496         }
1497
1498         /* this was a transmitted frame, but now we want to reuse it */
1499         skb_orphan(skb);
1500
1501         /*
1502          * This is a bit racy but we can avoid a lot of work
1503          * with this test...
1504          */
1505         if (!local->monitors && !local->cooked_mntrs) {
1506                 dev_kfree_skb(skb);
1507                 return;
1508         }
1509
1510         /* send frame to monitor interfaces now */
1511
1512         if (skb_headroom(skb) < sizeof(*rthdr)) {
1513                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
1514                 dev_kfree_skb(skb);
1515                 return;
1516         }
1517
1518         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
1519                                 skb_push(skb, sizeof(*rthdr));
1520
1521         memset(rthdr, 0, sizeof(*rthdr));
1522         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1523         rthdr->hdr.it_present =
1524                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
1525                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
1526
1527         if (!(status->flags & IEEE80211_TX_STATUS_ACK) &&
1528             !is_multicast_ether_addr(hdr->addr1))
1529                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
1530
1531         if ((status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) &&
1532             (status->control.flags & IEEE80211_TXCTL_USE_CTS_PROTECT))
1533                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
1534         else if (status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS)
1535                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
1536
1537         rthdr->data_retries = status->retry_count;
1538
1539         /* XXX: is this sufficient for BPF? */
1540         skb_set_mac_header(skb, 0);
1541         skb->ip_summed = CHECKSUM_UNNECESSARY;
1542         skb->pkt_type = PACKET_OTHERHOST;
1543         skb->protocol = htons(ETH_P_802_2);
1544         memset(skb->cb, 0, sizeof(skb->cb));
1545
1546         rcu_read_lock();
1547         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1548                 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) {
1549                         if (!netif_running(sdata->dev))
1550                                 continue;
1551
1552                         if (prev_dev) {
1553                                 skb2 = skb_clone(skb, GFP_ATOMIC);
1554                                 if (skb2) {
1555                                         skb2->dev = prev_dev;
1556                                         netif_rx(skb2);
1557                                 }
1558                         }
1559
1560                         prev_dev = sdata->dev;
1561                 }
1562         }
1563         if (prev_dev) {
1564                 skb->dev = prev_dev;
1565                 netif_rx(skb);
1566                 skb = NULL;
1567         }
1568         rcu_read_unlock();
1569         dev_kfree_skb(skb);
1570 }
1571 EXPORT_SYMBOL(ieee80211_tx_status);
1572
1573 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1574                                         const struct ieee80211_ops *ops)
1575 {
1576         struct ieee80211_local *local;
1577         int priv_size;
1578         struct wiphy *wiphy;
1579
1580         /* Ensure 32-byte alignment of our private data and hw private data.
1581          * We use the wiphy priv data for both our ieee80211_local and for
1582          * the driver's private data
1583          *
1584          * In memory it'll be like this:
1585          *
1586          * +-------------------------+
1587          * | struct wiphy           |
1588          * +-------------------------+
1589          * | struct ieee80211_local  |
1590          * +-------------------------+
1591          * | driver's private data   |
1592          * +-------------------------+
1593          *
1594          */
1595         priv_size = ((sizeof(struct ieee80211_local) +
1596                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
1597                     priv_data_len;
1598
1599         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
1600
1601         if (!wiphy)
1602                 return NULL;
1603
1604         wiphy->privid = mac80211_wiphy_privid;
1605
1606         local = wiphy_priv(wiphy);
1607         local->hw.wiphy = wiphy;
1608
1609         local->hw.priv = (char *)local +
1610                          ((sizeof(struct ieee80211_local) +
1611                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
1612
1613         BUG_ON(!ops->tx);
1614         BUG_ON(!ops->start);
1615         BUG_ON(!ops->stop);
1616         BUG_ON(!ops->config);
1617         BUG_ON(!ops->add_interface);
1618         BUG_ON(!ops->remove_interface);
1619         BUG_ON(!ops->configure_filter);
1620         local->ops = ops;
1621
1622         local->hw.queues = 1; /* default */
1623
1624         local->bridge_packets = 1;
1625
1626         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
1627         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1628         local->short_retry_limit = 7;
1629         local->long_retry_limit = 4;
1630         local->hw.conf.radio_enabled = 1;
1631
1632         INIT_LIST_HEAD(&local->interfaces);
1633
1634         spin_lock_init(&local->key_lock);
1635
1636         INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1637
1638         sta_info_init(local);
1639
1640         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1641                      (unsigned long)local);
1642         tasklet_disable(&local->tx_pending_tasklet);
1643
1644         tasklet_init(&local->tasklet,
1645                      ieee80211_tasklet_handler,
1646                      (unsigned long) local);
1647         tasklet_disable(&local->tasklet);
1648
1649         skb_queue_head_init(&local->skb_queue);
1650         skb_queue_head_init(&local->skb_queue_unreliable);
1651
1652         return local_to_hw(local);
1653 }
1654 EXPORT_SYMBOL(ieee80211_alloc_hw);
1655
1656 int ieee80211_register_hw(struct ieee80211_hw *hw)
1657 {
1658         struct ieee80211_local *local = hw_to_local(hw);
1659         const char *name;
1660         int result;
1661         enum ieee80211_band band;
1662         struct net_device *mdev;
1663         struct ieee80211_sub_if_data *sdata;
1664
1665         /*
1666          * generic code guarantees at least one band,
1667          * set this very early because much code assumes
1668          * that hw.conf.channel is assigned
1669          */
1670         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1671                 struct ieee80211_supported_band *sband;
1672
1673                 sband = local->hw.wiphy->bands[band];
1674                 if (sband) {
1675                         /* init channel we're on */
1676                         local->hw.conf.channel =
1677                         local->oper_channel =
1678                         local->scan_channel = &sband->channels[0];
1679                         break;
1680                 }
1681         }
1682
1683         result = wiphy_register(local->hw.wiphy);
1684         if (result < 0)
1685                 return result;
1686
1687         /* for now, mdev needs sub_if_data :/ */
1688         mdev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
1689                             "wmaster%d", ether_setup);
1690         if (!mdev)
1691                 goto fail_mdev_alloc;
1692
1693         sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
1694         mdev->ieee80211_ptr = &sdata->wdev;
1695         sdata->wdev.wiphy = local->hw.wiphy;
1696
1697         local->mdev = mdev;
1698
1699         ieee80211_rx_bss_list_init(mdev);
1700
1701         mdev->hard_start_xmit = ieee80211_master_start_xmit;
1702         mdev->open = ieee80211_master_open;
1703         mdev->stop = ieee80211_master_stop;
1704         mdev->type = ARPHRD_IEEE80211;
1705         mdev->header_ops = &ieee80211_header_ops;
1706         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
1707
1708         sdata->vif.type = IEEE80211_IF_TYPE_AP;
1709         sdata->dev = mdev;
1710         sdata->local = local;
1711         sdata->u.ap.force_unicast_rateidx = -1;
1712         sdata->u.ap.max_ratectrl_rateidx = -1;
1713         ieee80211_if_sdata_init(sdata);
1714
1715         /* no RCU needed since we're still during init phase */
1716         list_add_tail(&sdata->list, &local->interfaces);
1717
1718         name = wiphy_dev(local->hw.wiphy)->driver->name;
1719         local->hw.workqueue = create_singlethread_workqueue(name);
1720         if (!local->hw.workqueue) {
1721                 result = -ENOMEM;
1722                 goto fail_workqueue;
1723         }
1724
1725         /*
1726          * The hardware needs headroom for sending the frame,
1727          * and we need some headroom for passing the frame to monitor
1728          * interfaces, but never both at the same time.
1729          */
1730         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1731                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
1732
1733         debugfs_hw_add(local);
1734
1735         local->hw.conf.beacon_int = 1000;
1736
1737         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
1738                                                   IEEE80211_HW_SIGNAL_DB |
1739                                                   IEEE80211_HW_SIGNAL_DBM) ?
1740                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1741         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
1742                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1743         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
1744                 local->wstats_flags |= IW_QUAL_DBM;
1745
1746         result = sta_info_start(local);
1747         if (result < 0)
1748                 goto fail_sta_info;
1749
1750         rtnl_lock();
1751         result = dev_alloc_name(local->mdev, local->mdev->name);
1752         if (result < 0)
1753                 goto fail_dev;
1754
1755         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1756         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1757
1758         result = register_netdevice(local->mdev);
1759         if (result < 0)
1760                 goto fail_dev;
1761
1762         ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1763         ieee80211_if_set_type(local->mdev, IEEE80211_IF_TYPE_AP);
1764
1765         result = ieee80211_init_rate_ctrl_alg(local,
1766                                               hw->rate_control_algorithm);
1767         if (result < 0) {
1768                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1769                        "algorithm\n", wiphy_name(local->hw.wiphy));
1770                 goto fail_rate;
1771         }
1772
1773         result = ieee80211_wep_init(local);
1774
1775         if (result < 0) {
1776                 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1777                        wiphy_name(local->hw.wiphy));
1778                 goto fail_wep;
1779         }
1780
1781         if (hw->queues > IEEE80211_MAX_QUEUES)
1782                 hw->queues = IEEE80211_MAX_QUEUES;
1783         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
1784                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
1785
1786         ieee80211_install_qdisc(local->mdev);
1787
1788         /* add one default STA interface */
1789         result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
1790                                   IEEE80211_IF_TYPE_STA, NULL);
1791         if (result)
1792                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1793                        wiphy_name(local->hw.wiphy));
1794
1795         local->reg_state = IEEE80211_DEV_REGISTERED;
1796         rtnl_unlock();
1797
1798         ieee80211_led_init(local);
1799
1800         return 0;
1801
1802 fail_wep:
1803         rate_control_deinitialize(local);
1804 fail_rate:
1805         ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1806         unregister_netdevice(local->mdev);
1807         local->mdev = NULL;
1808 fail_dev:
1809         rtnl_unlock();
1810         sta_info_stop(local);
1811 fail_sta_info:
1812         debugfs_hw_del(local);
1813         destroy_workqueue(local->hw.workqueue);
1814 fail_workqueue:
1815         if (local->mdev != NULL) {
1816                 ieee80211_if_free(local->mdev);
1817                 local->mdev = NULL;
1818         }
1819 fail_mdev_alloc:
1820         wiphy_unregister(local->hw.wiphy);
1821         return result;
1822 }
1823 EXPORT_SYMBOL(ieee80211_register_hw);
1824
1825 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1826 {
1827         struct ieee80211_local *local = hw_to_local(hw);
1828         struct ieee80211_sub_if_data *sdata, *tmp;
1829
1830         tasklet_kill(&local->tx_pending_tasklet);
1831         tasklet_kill(&local->tasklet);
1832
1833         rtnl_lock();
1834
1835         BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
1836
1837         local->reg_state = IEEE80211_DEV_UNREGISTERED;
1838
1839         /*
1840          * At this point, interface list manipulations are fine
1841          * because the driver cannot be handing us frames any
1842          * more and the tasklet is killed.
1843          */
1844
1845         /*
1846          * First, we remove all non-master interfaces. Do this because they
1847          * may have bss pointer dependency on the master, and when we free
1848          * the master these would be freed as well, breaking our list
1849          * iteration completely.
1850          */
1851         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1852                 if (sdata->dev == local->mdev)
1853                         continue;
1854                 list_del(&sdata->list);
1855                 __ieee80211_if_del(local, sdata);
1856         }
1857
1858         /* then, finally, remove the master interface */
1859         __ieee80211_if_del(local, IEEE80211_DEV_TO_SUB_IF(local->mdev));
1860
1861         rtnl_unlock();
1862
1863         ieee80211_rx_bss_list_deinit(local->mdev);
1864         ieee80211_clear_tx_pending(local);
1865         sta_info_stop(local);
1866         rate_control_deinitialize(local);
1867         debugfs_hw_del(local);
1868
1869         if (skb_queue_len(&local->skb_queue)
1870                         || skb_queue_len(&local->skb_queue_unreliable))
1871                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1872                        wiphy_name(local->hw.wiphy));
1873         skb_queue_purge(&local->skb_queue);
1874         skb_queue_purge(&local->skb_queue_unreliable);
1875
1876         destroy_workqueue(local->hw.workqueue);
1877         wiphy_unregister(local->hw.wiphy);
1878         ieee80211_wep_free(local);
1879         ieee80211_led_exit(local);
1880         ieee80211_if_free(local->mdev);
1881         local->mdev = NULL;
1882 }
1883 EXPORT_SYMBOL(ieee80211_unregister_hw);
1884
1885 void ieee80211_free_hw(struct ieee80211_hw *hw)
1886 {
1887         struct ieee80211_local *local = hw_to_local(hw);
1888
1889         wiphy_free(local->hw.wiphy);
1890 }
1891 EXPORT_SYMBOL(ieee80211_free_hw);
1892
1893 static int __init ieee80211_init(void)
1894 {
1895         struct sk_buff *skb;
1896         int ret;
1897
1898         BUILD_BUG_ON(sizeof(struct ieee80211_tx_packet_data) > sizeof(skb->cb));
1899
1900         ret = rc80211_pid_init();
1901         if (ret)
1902                 goto out;
1903
1904         ret = ieee80211_wme_register();
1905         if (ret) {
1906                 printk(KERN_DEBUG "ieee80211_init: failed to "
1907                        "initialize WME (err=%d)\n", ret);
1908                 goto out_cleanup_pid;
1909         }
1910
1911         ieee80211_debugfs_netdev_init();
1912
1913         return 0;
1914
1915  out_cleanup_pid:
1916         rc80211_pid_exit();
1917  out:
1918         return ret;
1919 }
1920
1921 static void __exit ieee80211_exit(void)
1922 {
1923         rc80211_pid_exit();
1924
1925         /*
1926          * For key todo, it'll be empty by now but the work
1927          * might still be scheduled.
1928          */
1929         flush_scheduled_work();
1930
1931         if (mesh_allocated)
1932                 ieee80211s_stop();
1933
1934         ieee80211_wme_unregister();
1935         ieee80211_debugfs_netdev_exit();
1936 }
1937
1938
1939 subsys_initcall(ieee80211_init);
1940 module_exit(ieee80211_exit);
1941
1942 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1943 MODULE_LICENSE("GPL");