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                 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                 flush_workqueue(local->hw.workqueue);
 539
 540                 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
 541                 kfree(sdata->u.sta.extra_ie);
 542                 sdata->u.sta.extra_ie = NULL;
 543                 sdata->u.sta.extra_ie_len = 0;
 544                 /* fall through */
 545         default:
 546                 conf.vif = &sdata->vif;
 547                 conf.type = sdata->vif.type;
 548                 conf.mac_addr = dev->dev_addr;
 549                 /* disable all keys for as long as this netdev is down */
 550                 ieee80211_disable_keys(sdata);
 551                 local->ops->remove_interface(local_to_hw(local), &conf);
 552         }
 553
 554         if (local->open_count == 0) {
 555                 if (netif_running(local->mdev))
 556                         dev_close(local->mdev);
 557
 558                 if (local->ops->stop)
 559                         local->ops->stop(local_to_hw(local));
 560
 561                 ieee80211_led_radio(local, 0);
 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                 printk(KERN_DEBUG "Could not find the station\n");
 593                 ret = -ENOENT;
 594                 goto exit;
 595         }
 596
 597         spin_lock_bh(&sta->lock);
 598
 599         /* we have tried too many times, receiver does not want A-MPDU */
 600         if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
 601                 ret = -EBUSY;
 602                 goto err_unlock_sta;
 603         }
 604
 605         state = &sta->ampdu_mlme.tid_state_tx[tid];
 606         /* check if the TID is not in aggregation flow already */
 607         if (*state != HT_AGG_STATE_IDLE) {
 608 #ifdef CONFIG_MAC80211_HT_DEBUG
 609                 printk(KERN_DEBUG "BA request denied - session is not "
 610                                  "idle on tid %u\n", tid);
 611 #endif /* CONFIG_MAC80211_HT_DEBUG */
 612                 ret = -EAGAIN;
 613                 goto err_unlock_sta;
 614         }
 615
 616         /* prepare A-MPDU MLME for Tx aggregation */
 617         sta->ampdu_mlme.tid_tx[tid] =
 618                         kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
 619         if (!sta->ampdu_mlme.tid_tx[tid]) {
 620                 if (net_ratelimit())
 621                         printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
 622                                         tid);
 623                 ret = -ENOMEM;
 624                 goto err_unlock_sta;
 625         }
 626         /* Tx timer */
 627         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function =
 628                         sta_addba_resp_timer_expired;
 629         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data =
 630                         (unsigned long)&sta->timer_to_tid[tid];
 631         init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
 632
 633         /* ensure that TX flow won't interrupt us
 634          * until the end of the call to requeue function */
 635         spin_lock_bh(&local->mdev->queue_lock);
 636
 637         /* create a new queue for this aggregation */
 638         ret = ieee80211_ht_agg_queue_add(local, sta, tid);
 639
 640         /* case no queue is available to aggregation
 641          * don't switch to aggregation */
 642         if (ret) {
 643 #ifdef CONFIG_MAC80211_HT_DEBUG
 644                 printk(KERN_DEBUG "BA request denied - queue unavailable for"
 645                                         " tid %d\n", tid);
 646 #endif /* CONFIG_MAC80211_HT_DEBUG */
 647                 goto err_unlock_queue;
 648         }
 649         sdata = sta->sdata;
 650
 651         /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
 652          * call back right away, it must see that the flow has begun */
 653         *state |= HT_ADDBA_REQUESTED_MSK;
 654
 655         if (local->ops->ampdu_action)
 656                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
 657                                                 ra, tid, &start_seq_num);
 658
 659         if (ret) {
 660                 /* No need to requeue the packets in the agg queue, since we
 661                  * held the tx lock: no packet could be enqueued to the newly
 662                  * allocated queue */
 663                  ieee80211_ht_agg_queue_remove(local, sta, tid, 0);
 664 #ifdef CONFIG_MAC80211_HT_DEBUG
 665                 printk(KERN_DEBUG "BA request denied - HW unavailable for"
 666                                         " tid %d\n", tid);
 667 #endif /* CONFIG_MAC80211_HT_DEBUG */
 668                 *state = HT_AGG_STATE_IDLE;
 669                 goto err_unlock_queue;
 670         }
 671
 672         /* Will put all the packets in the new SW queue */
 673         ieee80211_requeue(local, ieee802_1d_to_ac[tid]);
 674         spin_unlock_bh(&local->mdev->queue_lock);
 675         spin_unlock_bh(&sta->lock);
 676
 677         /* send an addBA request */
 678         sta->ampdu_mlme.dialog_token_allocator++;
 679         sta->ampdu_mlme.tid_tx[tid]->dialog_token =
 680                         sta->ampdu_mlme.dialog_token_allocator;
 681         sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
 682
 683
 684         ieee80211_send_addba_request(sta->sdata->dev, ra, tid,
 685                          sta->ampdu_mlme.tid_tx[tid]->dialog_token,
 686                          sta->ampdu_mlme.tid_tx[tid]->ssn,
 687                          0x40, 5000);
 688         /* activate the timer for the recipient's addBA response */
 689         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
 690                                 jiffies + ADDBA_RESP_INTERVAL;
 691         add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
 692         printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
 693         goto exit;
 694
 695 err_unlock_queue:
 696         kfree(sta->ampdu_mlme.tid_tx[tid]);
 697         sta->ampdu_mlme.tid_tx[tid] = NULL;
 698         spin_unlock_bh(&local->mdev->queue_lock);
 699         ret = -EBUSY;
 700 err_unlock_sta:
 701         spin_unlock_bh(&sta->lock);
 702 exit:
 703         rcu_read_unlock();
 704         return ret;
 705 }
 706 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
 707
 708 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
 709                                  u8 *ra, u16 tid,
 710                                  enum ieee80211_back_parties initiator)
 711 {
 712         struct ieee80211_local *local = hw_to_local(hw);
 713         struct sta_info *sta;
 714         u8 *state;
 715         int ret = 0;
 716         DECLARE_MAC_BUF(mac);
 717
 718         if (tid >= STA_TID_NUM)
 719                 return -EINVAL;
 720
 721         rcu_read_lock();
 722         sta = sta_info_get(local, ra);
 723         if (!sta) {
 724                 rcu_read_unlock();
 725                 return -ENOENT;
 726         }
 727
 728         /* check if the TID is in aggregation */
 729         state = &sta->ampdu_mlme.tid_state_tx[tid];
 730         spin_lock_bh(&sta->lock);
 731
 732         if (*state != HT_AGG_STATE_OPERATIONAL) {
 733                 ret = -ENOENT;
 734                 goto stop_BA_exit;
 735         }
 736
 737 #ifdef CONFIG_MAC80211_HT_DEBUG
 738         printk(KERN_DEBUG "Tx BA session stop requested for %s tid %u\n",
 739                                 print_mac(mac, ra), tid);
 740 #endif /* CONFIG_MAC80211_HT_DEBUG */
 741
 742         ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]);
 743
 744         *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
 745                 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
 746
 747         if (local->ops->ampdu_action)
 748                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP,
 749                                                 ra, tid, NULL);
 750
 751         /* case HW denied going back to legacy */
 752         if (ret) {
 753                 WARN_ON(ret != -EBUSY);
 754                 *state = HT_AGG_STATE_OPERATIONAL;
 755                 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
 756                 goto stop_BA_exit;
 757         }
 758
 759 stop_BA_exit:
 760         spin_unlock_bh(&sta->lock);
 761         rcu_read_unlock();
 762         return ret;
 763 }
 764 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
 765
 766 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
 767 {
 768         struct ieee80211_local *local = hw_to_local(hw);
 769         struct sta_info *sta;
 770         u8 *state;
 771         DECLARE_MAC_BUF(mac);
 772
 773         if (tid >= STA_TID_NUM) {
 774                 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
 775                                 tid, STA_TID_NUM);
 776                 return;
 777         }
 778
 779         rcu_read_lock();
 780         sta = sta_info_get(local, ra);
 781         if (!sta) {
 782                 rcu_read_unlock();
 783                 printk(KERN_DEBUG "Could not find station: %s\n",
 784                                 print_mac(mac, ra));
 785                 return;
 786         }
 787
 788         state = &sta->ampdu_mlme.tid_state_tx[tid];
 789         spin_lock_bh(&sta->lock);
 790
 791         if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
 792                 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
 793                                 *state);
 794                 spin_unlock_bh(&sta->lock);
 795                 rcu_read_unlock();
 796                 return;
 797         }
 798
 799         WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK);
 800
 801         *state |= HT_ADDBA_DRV_READY_MSK;
 802
 803         if (*state == HT_AGG_STATE_OPERATIONAL) {
 804                 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
 805                 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
 806         }
 807         spin_unlock_bh(&sta->lock);
 808         rcu_read_unlock();
 809 }
 810 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
 811
 812 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
 813 {
 814         struct ieee80211_local *local = hw_to_local(hw);
 815         struct sta_info *sta;
 816         u8 *state;
 817         int agg_queue;
 818         DECLARE_MAC_BUF(mac);
 819
 820         if (tid >= STA_TID_NUM) {
 821                 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
 822                                 tid, STA_TID_NUM);
 823                 return;
 824         }
 825
 826 #ifdef CONFIG_MAC80211_HT_DEBUG
 827         printk(KERN_DEBUG "Stopping Tx BA session for %s tid %d\n",
 828                                 print_mac(mac, ra), tid);
 829 #endif /* CONFIG_MAC80211_HT_DEBUG */
 830
 831         rcu_read_lock();
 832         sta = sta_info_get(local, ra);
 833         if (!sta) {
 834                 printk(KERN_DEBUG "Could not find station: %s\n",
 835                                 print_mac(mac, ra));
 836                 rcu_read_unlock();
 837                 return;
 838         }
 839         state = &sta->ampdu_mlme.tid_state_tx[tid];
 840
 841         /* NOTE: no need to use sta->lock in this state check, as
 842          * ieee80211_stop_tx_ba_session will let only
 843          * one stop call to pass through per sta/tid */
 844         if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
 845                 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
 846                 rcu_read_unlock();
 847                 return;
 848         }
 849
 850         if (*state & HT_AGG_STATE_INITIATOR_MSK)
 851                 ieee80211_send_delba(sta->sdata->dev, ra, tid,
 852                         WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
 853
 854         agg_queue = sta->tid_to_tx_q[tid];
 855
 856         /* avoid ordering issues: we are the only one that can modify
 857          * the content of the qdiscs */
 858         spin_lock_bh(&local->mdev->queue_lock);
 859         /* remove the queue for this aggregation */
 860         ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
 861         spin_unlock_bh(&local->mdev->queue_lock);
 862
 863         /* we just requeued the all the frames that were in the removed
 864          * queue, and since we might miss a softirq we do netif_schedule.
 865          * ieee80211_wake_queue is not used here as this queue is not
 866          * necessarily stopped */
 867         netif_schedule(local->mdev);
 868         spin_lock_bh(&sta->lock);
 869         *state = HT_AGG_STATE_IDLE;
 870         sta->ampdu_mlme.addba_req_num[tid] = 0;
 871         kfree(sta->ampdu_mlme.tid_tx[tid]);
 872         sta->ampdu_mlme.tid_tx[tid] = NULL;
 873         spin_unlock_bh(&sta->lock);
 874
 875         rcu_read_unlock();
 876 }
 877 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
 878
 879 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
 880                                       const u8 *ra, u16 tid)
 881 {
 882         struct ieee80211_local *local = hw_to_local(hw);
 883         struct ieee80211_ra_tid *ra_tid;
 884         struct sk_buff *skb = dev_alloc_skb(0);
 885
 886         if (unlikely(!skb)) {
 887                 if (net_ratelimit())
 888                         printk(KERN_WARNING "%s: Not enough memory, "
 889                                "dropping start BA session", skb->dev->name);
 890                 return;
 891         }
 892         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 893         memcpy(&ra_tid->ra, ra, ETH_ALEN);
 894         ra_tid->tid = tid;
 895
 896         skb->pkt_type = IEEE80211_ADDBA_MSG;
 897         skb_queue_tail(&local->skb_queue, skb);
 898         tasklet_schedule(&local->tasklet);
 899 }
 900 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
 901
 902 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
 903                                      const u8 *ra, u16 tid)
 904 {
 905         struct ieee80211_local *local = hw_to_local(hw);
 906         struct ieee80211_ra_tid *ra_tid;
 907         struct sk_buff *skb = dev_alloc_skb(0);
 908
 909         if (unlikely(!skb)) {
 910                 if (net_ratelimit())
 911                         printk(KERN_WARNING "%s: Not enough memory, "
 912                                "dropping stop BA session", skb->dev->name);
 913                 return;
 914         }
 915         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 916         memcpy(&ra_tid->ra, ra, ETH_ALEN);
 917         ra_tid->tid = tid;
 918
 919         skb->pkt_type = IEEE80211_DELBA_MSG;
 920         skb_queue_tail(&local->skb_queue, skb);
 921         tasklet_schedule(&local->tasklet);
 922 }
 923 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
 924
 925 static void ieee80211_set_multicast_list(struct net_device *dev)
 926 {
 927         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 928         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 929         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 930
 931         allmulti = !!(dev->flags & IFF_ALLMULTI);
 932         promisc = !!(dev->flags & IFF_PROMISC);
 933         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 934         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 935
 936         if (allmulti != sdata_allmulti) {
 937                 if (dev->flags & IFF_ALLMULTI)
 938                         atomic_inc(&local->iff_allmultis);
 939                 else
 940                         atomic_dec(&local->iff_allmultis);
 941                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 942         }
 943
 944         if (promisc != sdata_promisc) {
 945                 if (dev->flags & IFF_PROMISC)
 946                         atomic_inc(&local->iff_promiscs);
 947                 else
 948                         atomic_dec(&local->iff_promiscs);
 949                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 950         }
 951
 952         dev_mc_sync(local->mdev, dev);
 953 }
 954
 955 static const struct header_ops ieee80211_header_ops = {
 956         .create         = eth_header,
 957         .parse          = header_parse_80211,
 958         .rebuild        = eth_rebuild_header,
 959         .cache          = eth_header_cache,
 960         .cache_update   = eth_header_cache_update,
 961 };
 962
 963 /* Must not be called for mdev */
 964 void ieee80211_if_setup(struct net_device *dev)
 965 {
 966         ether_setup(dev);
 967         dev->hard_start_xmit = ieee80211_subif_start_xmit;
 968         dev->wireless_handlers = &ieee80211_iw_handler_def;
 969         dev->set_multicast_list = ieee80211_set_multicast_list;
 970         dev->change_mtu = ieee80211_change_mtu;
 971         dev->open = ieee80211_open;
 972         dev->stop = ieee80211_stop;
 973         dev->destructor = ieee80211_if_free;
 974 }
 975
 976 /* everything else */
 977
 978 static int __ieee80211_if_config(struct net_device *dev,
 979                                  struct sk_buff *beacon)
 980 {
 981         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 982         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 983         struct ieee80211_if_conf conf;
 984
 985         if (!local->ops->config_interface || !netif_running(dev))
 986                 return 0;
 987
 988         memset(&conf, 0, sizeof(conf));
 989         conf.type = sdata->vif.type;
 990         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
 991             sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
 992                 conf.bssid = sdata->u.sta.bssid;
 993                 conf.ssid = sdata->u.sta.ssid;
 994                 conf.ssid_len = sdata->u.sta.ssid_len;
 995         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 996                 conf.beacon = beacon;
 997                 ieee80211_start_mesh(dev);
 998         } else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
 999                 conf.ssid = sdata->u.ap.ssid;
1000                 conf.ssid_len = sdata->u.ap.ssid_len;
1001                 conf.beacon = beacon;
1002         }
1003         return local->ops->config_interface(local_to_hw(local),
1004                                             &sdata->vif, &conf);
1005 }
1006
1007 int ieee80211_if_config(struct net_device *dev)
1008 {
1009         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1010         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1011         if (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT &&
1012             (local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
1013                 return ieee80211_if_config_beacon(dev);
1014         return __ieee80211_if_config(dev, NULL);
1015 }
1016
1017 int ieee80211_if_config_beacon(struct net_device *dev)
1018 {
1019         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1020         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1021         struct sk_buff *skb;
1022
1023         if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
1024                 return 0;
1025         skb = ieee80211_beacon_get(local_to_hw(local), &sdata->vif);
1026         if (!skb)
1027                 return -ENOMEM;
1028         return __ieee80211_if_config(dev, skb);
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 {
1185         struct ieee80211_local *local = hw_to_local(hw);
1186         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1187         int tmp;
1188
1189         skb->dev = local->mdev;
1190         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
1191         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
1192                        &local->skb_queue : &local->skb_queue_unreliable, skb);
1193         tmp = skb_queue_len(&local->skb_queue) +
1194                 skb_queue_len(&local->skb_queue_unreliable);
1195         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
1196                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1197                 dev_kfree_skb_irq(skb);
1198                 tmp--;
1199                 I802_DEBUG_INC(local->tx_status_drop);
1200         }
1201         tasklet_schedule(&local->tasklet);
1202 }
1203 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
1204
1205 static void ieee80211_tasklet_handler(unsigned long data)
1206 {
1207         struct ieee80211_local *local = (struct ieee80211_local *) data;
1208         struct sk_buff *skb;
1209         struct ieee80211_rx_status rx_status;
1210         struct ieee80211_ra_tid *ra_tid;
1211
1212         while ((skb = skb_dequeue(&local->skb_queue)) ||
1213                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1214                 switch (skb->pkt_type) {
1215                 case IEEE80211_RX_MSG:
1216                         /* status is in skb->cb */
1217                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
1218                         /* Clear skb->pkt_type in order to not confuse kernel
1219                          * netstack. */
1220                         skb->pkt_type = 0;
1221                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
1222                         break;
1223                 case IEEE80211_TX_STATUS_MSG:
1224                         skb->pkt_type = 0;
1225                         ieee80211_tx_status(local_to_hw(local), skb);
1226                         break;
1227                 case IEEE80211_DELBA_MSG:
1228                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1229                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
1230                                                 ra_tid->ra, ra_tid->tid);
1231                         dev_kfree_skb(skb);
1232                         break;
1233                 case IEEE80211_ADDBA_MSG:
1234                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1235                         ieee80211_start_tx_ba_cb(local_to_hw(local),
1236                                                  ra_tid->ra, ra_tid->tid);
1237                         dev_kfree_skb(skb);
1238                         break ;
1239                 default: /* should never get here! */
1240                         printk(KERN_ERR "%s: Unknown message type (%d)\n",
1241                                wiphy_name(local->hw.wiphy), skb->pkt_type);
1242                         dev_kfree_skb(skb);
1243                         break;
1244                 }
1245         }
1246 }
1247
1248 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
1249  * make a prepared TX frame (one that has been given to hw) to look like brand
1250  * new IEEE 802.11 frame that is ready to go through TX processing again.
1251  * Also, tx_packet_data in cb is restored from tx_control. */
1252 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
1253                                       struct ieee80211_key *key,
1254                                       struct sk_buff *skb)
1255 {
1256         int hdrlen, iv_len, mic_len;
1257         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1258
1259         info->flags &=  IEEE80211_TX_CTL_REQ_TX_STATUS |
1260                         IEEE80211_TX_CTL_DO_NOT_ENCRYPT |
1261                         IEEE80211_TX_CTL_REQUEUE |
1262                         IEEE80211_TX_CTL_EAPOL_FRAME;
1263
1264         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1265
1266         if (!key)
1267                 goto no_key;
1268
1269         switch (key->conf.alg) {
1270         case ALG_WEP:
1271                 iv_len = WEP_IV_LEN;
1272                 mic_len = WEP_ICV_LEN;
1273                 break;
1274         case ALG_TKIP:
1275                 iv_len = TKIP_IV_LEN;
1276                 mic_len = TKIP_ICV_LEN;
1277                 break;
1278         case ALG_CCMP:
1279                 iv_len = CCMP_HDR_LEN;
1280                 mic_len = CCMP_MIC_LEN;
1281                 break;
1282         default:
1283                 goto no_key;
1284         }
1285
1286         if (skb->len >= mic_len &&
1287             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
1288                 skb_trim(skb, skb->len - mic_len);
1289         if (skb->len >= iv_len && skb->len > hdrlen) {
1290                 memmove(skb->data + iv_len, skb->data, hdrlen);
1291                 skb_pull(skb, iv_len);
1292         }
1293
1294 no_key:
1295         {
1296                 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1297                 u16 fc = le16_to_cpu(hdr->frame_control);
1298                 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
1299                         fc &= ~IEEE80211_STYPE_QOS_DATA;
1300                         hdr->frame_control = cpu_to_le16(fc);
1301                         memmove(skb->data + 2, skb->data, hdrlen - 2);
1302                         skb_pull(skb, 2);
1303                 }
1304         }
1305 }
1306
1307 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
1308                                             struct sta_info *sta,
1309                                             struct sk_buff *skb)
1310 {
1311         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1312
1313         sta->tx_filtered_count++;
1314
1315         /*
1316          * Clear the TX filter mask for this STA when sending the next
1317          * packet. If the STA went to power save mode, this will happen
1318          * when it wakes up for the next time.
1319          */
1320         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
1321
1322         /*
1323          * This code races in the following way:
1324          *
1325          *  (1) STA sends frame indicating it will go to sleep and does so
1326          *  (2) hardware/firmware adds STA to filter list, passes frame up
1327          *  (3) hardware/firmware processes TX fifo and suppresses a frame
1328          *  (4) we get TX status before having processed the frame and
1329          *      knowing that the STA has gone to sleep.
1330          *
1331          * This is actually quite unlikely even when both those events are
1332          * processed from interrupts coming in quickly after one another or
1333          * even at the same time because we queue both TX status events and
1334          * RX frames to be processed by a tasklet and process them in the
1335          * same order that they were received or TX status last. Hence, there
1336          * is no race as long as the frame RX is processed before the next TX
1337          * status, which drivers can ensure, see below.
1338          *
1339          * Note that this can only happen if the hardware or firmware can
1340          * actually add STAs to the filter list, if this is done by the
1341          * driver in response to set_tim() (which will only reduce the race
1342          * this whole filtering tries to solve, not completely solve it)
1343          * this situation cannot happen.
1344          *
1345          * To completely solve this race drivers need to make sure that they
1346          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
1347          *      functions and
1348          *  (b) always process RX events before TX status events if ordering
1349          *      can be unknown, for example with different interrupt status
1350          *      bits.
1351          */
1352         if (test_sta_flags(sta, WLAN_STA_PS) &&
1353             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
1354                 ieee80211_remove_tx_extra(local, sta->key, skb);
1355                 skb_queue_tail(&sta->tx_filtered, skb);
1356                 return;
1357         }
1358
1359         if (!test_sta_flags(sta, WLAN_STA_PS) &&
1360             !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
1361                 /* Software retry the packet once */
1362                 info->flags |= IEEE80211_TX_CTL_REQUEUE;
1363                 ieee80211_remove_tx_extra(local, sta->key, skb);
1364                 dev_queue_xmit(skb);
1365                 return;
1366         }
1367
1368         if (net_ratelimit())
1369                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
1370                        "queue_len=%d PS=%d @%lu\n",
1371                        wiphy_name(local->hw.wiphy),
1372                        skb_queue_len(&sta->tx_filtered),
1373                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
1374         dev_kfree_skb(skb);
1375 }
1376
1377 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1378 {
1379         struct sk_buff *skb2;
1380         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1381         struct ieee80211_local *local = hw_to_local(hw);
1382         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1383         u16 frag, type;
1384         struct ieee80211_tx_status_rtap_hdr *rthdr;
1385         struct ieee80211_sub_if_data *sdata;
1386         struct net_device *prev_dev = NULL;
1387
1388         rcu_read_lock();
1389
1390         if (info->status.excessive_retries) {
1391                 struct sta_info *sta;
1392                 sta = sta_info_get(local, hdr->addr1);
1393                 if (sta) {
1394                         if (test_sta_flags(sta, WLAN_STA_PS)) {
1395                                 /*
1396                                  * The STA is in power save mode, so assume
1397                                  * that this TX packet failed because of that.
1398                                  */
1399                                 ieee80211_handle_filtered_frame(local, sta, skb);
1400                                 rcu_read_unlock();
1401                                 return;
1402                         }
1403                 }
1404         }
1405
1406         if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
1407                 struct sta_info *sta;
1408                 sta = sta_info_get(local, hdr->addr1);
1409                 if (sta) {
1410                         ieee80211_handle_filtered_frame(local, sta, skb);
1411                         rcu_read_unlock();
1412                         return;
1413                 }
1414         } else
1415                 rate_control_tx_status(local->mdev, skb);
1416
1417         rcu_read_unlock();
1418
1419         ieee80211_led_tx(local, 0);
1420
1421         /* SNMP counters
1422          * Fragments are passed to low-level drivers as separate skbs, so these
1423          * are actually fragments, not frames. Update frame counters only for
1424          * the first fragment of the frame. */
1425
1426         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
1427         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
1428
1429         if (info->flags & IEEE80211_TX_STAT_ACK) {
1430                 if (frag == 0) {
1431                         local->dot11TransmittedFrameCount++;
1432                         if (is_multicast_ether_addr(hdr->addr1))
1433                                 local->dot11MulticastTransmittedFrameCount++;
1434                         if (info->status.retry_count > 0)
1435                                 local->dot11RetryCount++;
1436                         if (info->status.retry_count > 1)
1437                                 local->dot11MultipleRetryCount++;
1438                 }
1439
1440                 /* This counter shall be incremented for an acknowledged MPDU
1441                  * with an individual address in the address 1 field or an MPDU
1442                  * with a multicast address in the address 1 field of type Data
1443                  * or Management. */
1444                 if (!is_multicast_ether_addr(hdr->addr1) ||
1445                     type == IEEE80211_FTYPE_DATA ||
1446                     type == IEEE80211_FTYPE_MGMT)
1447                         local->dot11TransmittedFragmentCount++;
1448         } else {
1449                 if (frag == 0)
1450                         local->dot11FailedCount++;
1451         }
1452
1453         /* this was a transmitted frame, but now we want to reuse it */
1454         skb_orphan(skb);
1455
1456         /*
1457          * This is a bit racy but we can avoid a lot of work
1458          * with this test...
1459          */
1460         if (!local->monitors && !local->cooked_mntrs) {
1461                 dev_kfree_skb(skb);
1462                 return;
1463         }
1464
1465         /* send frame to monitor interfaces now */
1466
1467         if (skb_headroom(skb) < sizeof(*rthdr)) {
1468                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
1469                 dev_kfree_skb(skb);
1470                 return;
1471         }
1472
1473         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
1474                                 skb_push(skb, sizeof(*rthdr));
1475
1476         memset(rthdr, 0, sizeof(*rthdr));
1477         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1478         rthdr->hdr.it_present =
1479                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
1480                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
1481
1482         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
1483             !is_multicast_ether_addr(hdr->addr1))
1484                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
1485
1486         if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
1487             (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
1488                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
1489         else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
1490                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
1491
1492         rthdr->data_retries = info->status.retry_count;
1493
1494         /* XXX: is this sufficient for BPF? */
1495         skb_set_mac_header(skb, 0);
1496         skb->ip_summed = CHECKSUM_UNNECESSARY;
1497         skb->pkt_type = PACKET_OTHERHOST;
1498         skb->protocol = htons(ETH_P_802_2);
1499         memset(skb->cb, 0, sizeof(skb->cb));
1500
1501         rcu_read_lock();
1502         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1503                 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) {
1504                         if (!netif_running(sdata->dev))
1505                                 continue;
1506
1507                         if (prev_dev) {
1508                                 skb2 = skb_clone(skb, GFP_ATOMIC);
1509                                 if (skb2) {
1510                                         skb2->dev = prev_dev;
1511                                         netif_rx(skb2);
1512                                 }
1513                         }
1514
1515                         prev_dev = sdata->dev;
1516                 }
1517         }
1518         if (prev_dev) {
1519                 skb->dev = prev_dev;
1520                 netif_rx(skb);
1521                 skb = NULL;
1522         }
1523         rcu_read_unlock();
1524         dev_kfree_skb(skb);
1525 }
1526 EXPORT_SYMBOL(ieee80211_tx_status);
1527
1528 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1529                                         const struct ieee80211_ops *ops)
1530 {
1531         struct ieee80211_local *local;
1532         int priv_size;
1533         struct wiphy *wiphy;
1534
1535         /* Ensure 32-byte alignment of our private data and hw private data.
1536          * We use the wiphy priv data for both our ieee80211_local and for
1537          * the driver's private data
1538          *
1539          * In memory it'll be like this:
1540          *
1541          * +-------------------------+
1542          * | struct wiphy           |
1543          * +-------------------------+
1544          * | struct ieee80211_local  |
1545          * +-------------------------+
1546          * | driver's private data   |
1547          * +-------------------------+
1548          *
1549          */
1550         priv_size = ((sizeof(struct ieee80211_local) +
1551                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
1552                     priv_data_len;
1553
1554         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
1555
1556         if (!wiphy)
1557                 return NULL;
1558
1559         wiphy->privid = mac80211_wiphy_privid;
1560
1561         local = wiphy_priv(wiphy);
1562         local->hw.wiphy = wiphy;
1563
1564         local->hw.priv = (char *)local +
1565                          ((sizeof(struct ieee80211_local) +
1566                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
1567
1568         BUG_ON(!ops->tx);
1569         BUG_ON(!ops->start);
1570         BUG_ON(!ops->stop);
1571         BUG_ON(!ops->config);
1572         BUG_ON(!ops->add_interface);
1573         BUG_ON(!ops->remove_interface);
1574         BUG_ON(!ops->configure_filter);
1575         local->ops = ops;
1576
1577         local->hw.queues = 1; /* default */
1578
1579         local->bridge_packets = 1;
1580
1581         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
1582         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1583         local->short_retry_limit = 7;
1584         local->long_retry_limit = 4;
1585         local->hw.conf.radio_enabled = 1;
1586
1587         INIT_LIST_HEAD(&local->interfaces);
1588
1589         spin_lock_init(&local->key_lock);
1590
1591         INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1592
1593         sta_info_init(local);
1594
1595         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1596                      (unsigned long)local);
1597         tasklet_disable(&local->tx_pending_tasklet);
1598
1599         tasklet_init(&local->tasklet,
1600                      ieee80211_tasklet_handler,
1601                      (unsigned long) local);
1602         tasklet_disable(&local->tasklet);
1603
1604         skb_queue_head_init(&local->skb_queue);
1605         skb_queue_head_init(&local->skb_queue_unreliable);
1606
1607         return local_to_hw(local);
1608 }
1609 EXPORT_SYMBOL(ieee80211_alloc_hw);
1610
1611 int ieee80211_register_hw(struct ieee80211_hw *hw)
1612 {
1613         struct ieee80211_local *local = hw_to_local(hw);
1614         const char *name;
1615         int result;
1616         enum ieee80211_band band;
1617         struct net_device *mdev;
1618         struct ieee80211_sub_if_data *sdata;
1619
1620         /*
1621          * generic code guarantees at least one band,
1622          * set this very early because much code assumes
1623          * that hw.conf.channel is assigned
1624          */
1625         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1626                 struct ieee80211_supported_band *sband;
1627
1628                 sband = local->hw.wiphy->bands[band];
1629                 if (sband) {
1630                         /* init channel we're on */
1631                         local->hw.conf.channel =
1632                         local->oper_channel =
1633                         local->scan_channel = &sband->channels[0];
1634                         break;
1635                 }
1636         }
1637
1638         result = wiphy_register(local->hw.wiphy);
1639         if (result < 0)
1640                 return result;
1641
1642         /*
1643          * We use the number of queues for feature tests (QoS, HT) internally
1644          * so restrict them appropriately.
1645          */
1646 #ifdef CONFIG_MAC80211_QOS
1647         if (hw->queues > IEEE80211_MAX_QUEUES)
1648                 hw->queues = IEEE80211_MAX_QUEUES;
1649         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
1650                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
1651         if (hw->queues < 4)
1652                 hw->ampdu_queues = 0;
1653 #else
1654         hw->queues = 1;
1655         hw->ampdu_queues = 0;
1656 #endif
1657
1658         /* for now, mdev needs sub_if_data :/ */
1659         mdev = alloc_netdev_mq(sizeof(struct ieee80211_sub_if_data),
1660                                "wmaster%d", ether_setup,
1661                                ieee80211_num_queues(hw));
1662         if (!mdev)
1663                 goto fail_mdev_alloc;
1664
1665         if (ieee80211_num_queues(hw) > 1)
1666                 mdev->features |= NETIF_F_MULTI_QUEUE;
1667
1668         sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
1669         mdev->ieee80211_ptr = &sdata->wdev;
1670         sdata->wdev.wiphy = local->hw.wiphy;
1671
1672         local->mdev = mdev;
1673
1674         ieee80211_rx_bss_list_init(mdev);
1675
1676         mdev->hard_start_xmit = ieee80211_master_start_xmit;
1677         mdev->open = ieee80211_master_open;
1678         mdev->stop = ieee80211_master_stop;
1679         mdev->type = ARPHRD_IEEE80211;
1680         mdev->header_ops = &ieee80211_header_ops;
1681         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
1682
1683         sdata->vif.type = IEEE80211_IF_TYPE_AP;
1684         sdata->dev = mdev;
1685         sdata->local = local;
1686         sdata->u.ap.force_unicast_rateidx = -1;
1687         sdata->u.ap.max_ratectrl_rateidx = -1;
1688         ieee80211_if_sdata_init(sdata);
1689
1690         /* no RCU needed since we're still during init phase */
1691         list_add_tail(&sdata->list, &local->interfaces);
1692
1693         name = wiphy_dev(local->hw.wiphy)->driver->name;
1694         local->hw.workqueue = create_singlethread_workqueue(name);
1695         if (!local->hw.workqueue) {
1696                 result = -ENOMEM;
1697                 goto fail_workqueue;
1698         }
1699
1700         /*
1701          * The hardware needs headroom for sending the frame,
1702          * and we need some headroom for passing the frame to monitor
1703          * interfaces, but never both at the same time.
1704          */
1705         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1706                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
1707
1708         debugfs_hw_add(local);
1709
1710         local->hw.conf.beacon_int = 1000;
1711
1712         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
1713                                                   IEEE80211_HW_SIGNAL_DB |
1714                                                   IEEE80211_HW_SIGNAL_DBM) ?
1715                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1716         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
1717                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1718         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
1719                 local->wstats_flags |= IW_QUAL_DBM;
1720
1721         result = sta_info_start(local);
1722         if (result < 0)
1723                 goto fail_sta_info;
1724
1725         rtnl_lock();
1726         result = dev_alloc_name(local->mdev, local->mdev->name);
1727         if (result < 0)
1728                 goto fail_dev;
1729
1730         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1731         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1732
1733         result = register_netdevice(local->mdev);
1734         if (result < 0)
1735                 goto fail_dev;
1736
1737         ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1738         ieee80211_if_set_type(local->mdev, IEEE80211_IF_TYPE_AP);
1739
1740         result = ieee80211_init_rate_ctrl_alg(local,
1741                                               hw->rate_control_algorithm);
1742         if (result < 0) {
1743                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1744                        "algorithm\n", wiphy_name(local->hw.wiphy));
1745                 goto fail_rate;
1746         }
1747
1748         result = ieee80211_wep_init(local);
1749
1750         if (result < 0) {
1751                 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1752                        wiphy_name(local->hw.wiphy));
1753                 goto fail_wep;
1754         }
1755
1756         ieee80211_install_qdisc(local->mdev);
1757
1758         /* add one default STA interface */
1759         result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
1760                                   IEEE80211_IF_TYPE_STA, NULL);
1761         if (result)
1762                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1763                        wiphy_name(local->hw.wiphy));
1764
1765         local->reg_state = IEEE80211_DEV_REGISTERED;
1766         rtnl_unlock();
1767
1768         ieee80211_led_init(local);
1769
1770         return 0;
1771
1772 fail_wep:
1773         rate_control_deinitialize(local);
1774 fail_rate:
1775         ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1776         unregister_netdevice(local->mdev);
1777         local->mdev = NULL;
1778 fail_dev:
1779         rtnl_unlock();
1780         sta_info_stop(local);
1781 fail_sta_info:
1782         debugfs_hw_del(local);
1783         destroy_workqueue(local->hw.workqueue);
1784 fail_workqueue:
1785         if (local->mdev != NULL) {
1786                 ieee80211_if_free(local->mdev);
1787                 local->mdev = NULL;
1788         }
1789 fail_mdev_alloc:
1790         wiphy_unregister(local->hw.wiphy);
1791         return result;
1792 }
1793 EXPORT_SYMBOL(ieee80211_register_hw);
1794
1795 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1796 {
1797         struct ieee80211_local *local = hw_to_local(hw);
1798         struct ieee80211_sub_if_data *sdata, *tmp;
1799
1800         tasklet_kill(&local->tx_pending_tasklet);
1801         tasklet_kill(&local->tasklet);
1802
1803         rtnl_lock();
1804
1805         BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
1806
1807         local->reg_state = IEEE80211_DEV_UNREGISTERED;
1808
1809         /*
1810          * At this point, interface list manipulations are fine
1811          * because the driver cannot be handing us frames any
1812          * more and the tasklet is killed.
1813          */
1814
1815         /*
1816          * First, we remove all non-master interfaces. Do this because they
1817          * may have bss pointer dependency on the master, and when we free
1818          * the master these would be freed as well, breaking our list
1819          * iteration completely.
1820          */
1821         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1822                 if (sdata->dev == local->mdev)
1823                         continue;
1824                 list_del(&sdata->list);
1825                 __ieee80211_if_del(local, sdata);
1826         }
1827
1828         /* then, finally, remove the master interface */
1829         __ieee80211_if_del(local, IEEE80211_DEV_TO_SUB_IF(local->mdev));
1830
1831         rtnl_unlock();
1832
1833         ieee80211_rx_bss_list_deinit(local->mdev);
1834         ieee80211_clear_tx_pending(local);
1835         sta_info_stop(local);
1836         rate_control_deinitialize(local);
1837         debugfs_hw_del(local);
1838
1839         if (skb_queue_len(&local->skb_queue)
1840                         || skb_queue_len(&local->skb_queue_unreliable))
1841                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1842                        wiphy_name(local->hw.wiphy));
1843         skb_queue_purge(&local->skb_queue);
1844         skb_queue_purge(&local->skb_queue_unreliable);
1845
1846         destroy_workqueue(local->hw.workqueue);
1847         wiphy_unregister(local->hw.wiphy);
1848         ieee80211_wep_free(local);
1849         ieee80211_led_exit(local);
1850         ieee80211_if_free(local->mdev);
1851         local->mdev = NULL;
1852 }
1853 EXPORT_SYMBOL(ieee80211_unregister_hw);
1854
1855 void ieee80211_free_hw(struct ieee80211_hw *hw)
1856 {
1857         struct ieee80211_local *local = hw_to_local(hw);
1858
1859         wiphy_free(local->hw.wiphy);
1860 }
1861 EXPORT_SYMBOL(ieee80211_free_hw);
1862
1863 static int __init ieee80211_init(void)
1864 {
1865         struct sk_buff *skb;
1866         int ret;
1867
1868         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1869         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1870                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1871
1872         ret = rc80211_pid_init();
1873         if (ret)
1874                 goto out;
1875
1876         ret = ieee80211_wme_register();
1877         if (ret) {
1878                 printk(KERN_DEBUG "ieee80211_init: failed to "
1879                        "initialize WME (err=%d)\n", ret);
1880                 goto out_cleanup_pid;
1881         }
1882
1883         ieee80211_debugfs_netdev_init();
1884
1885         return 0;
1886
1887  out_cleanup_pid:
1888         rc80211_pid_exit();
1889  out:
1890         return ret;
1891 }
1892
1893 static void __exit ieee80211_exit(void)
1894 {
1895         rc80211_pid_exit();
1896
1897         /*
1898          * For key todo, it'll be empty by now but the work
1899          * might still be scheduled.
1900          */
1901         flush_scheduled_work();
1902
1903         if (mesh_allocated)
1904                 ieee80211s_stop();
1905
1906         ieee80211_wme_unregister();
1907         ieee80211_debugfs_netdev_exit();
1908 }
1909
1910
1911 subsys_initcall(ieee80211_init);
1912 module_exit(ieee80211_exit);
1913
1914 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1915 MODULE_LICENSE("GPL");