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 (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 (netif_running(sdata->dev))
 130                         dev_close(sdata->dev);
 131
 132         return 0;
 133 }
 134
 135 static void ieee80211_master_set_multicast_list(struct net_device *dev)
 136 {
 137         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 138
 139         ieee80211_configure_filter(local);
 140 }
 141
 142 /* regular interfaces */
 143
 144 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 145 {
 146         int meshhdrlen;
 147         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 148
 149         meshhdrlen = (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) ? 5 : 0;
 150
 151         /* FIX: what would be proper limits for MTU?
 152          * This interface uses 802.3 frames. */
 153         if (new_mtu < 256 ||
 154             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
 155                 return -EINVAL;
 156         }
 157
 158 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 159         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
 160 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 161         dev->mtu = new_mtu;
 162         return 0;
 163 }
 164
 165 static inline int identical_mac_addr_allowed(int type1, int type2)
 166 {
 167         return (type1 == IEEE80211_IF_TYPE_MNTR ||
 168                 type2 == IEEE80211_IF_TYPE_MNTR ||
 169                 (type1 == IEEE80211_IF_TYPE_AP &&
 170                  type2 == IEEE80211_IF_TYPE_WDS) ||
 171                 (type1 == IEEE80211_IF_TYPE_WDS &&
 172                  (type2 == IEEE80211_IF_TYPE_WDS ||
 173                   type2 == IEEE80211_IF_TYPE_AP)) ||
 174                 (type1 == IEEE80211_IF_TYPE_AP &&
 175                  type2 == IEEE80211_IF_TYPE_VLAN) ||
 176                 (type1 == IEEE80211_IF_TYPE_VLAN &&
 177                  (type2 == IEEE80211_IF_TYPE_AP ||
 178                   type2 == IEEE80211_IF_TYPE_VLAN)));
 179 }
 180
 181 static int ieee80211_open(struct net_device *dev)
 182 {
 183         struct ieee80211_sub_if_data *sdata, *nsdata;
 184         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 185         struct sta_info *sta;
 186         struct ieee80211_if_init_conf conf;
 187         u32 changed = 0;
 188         int res;
 189         bool need_hw_reconfig = 0;
 190
 191         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 192
 193         /* we hold the RTNL here so can safely walk the list */
 194         list_for_each_entry(nsdata, &local->interfaces, list) {
 195                 struct net_device *ndev = nsdata->dev;
 196
 197                 if (ndev != dev && netif_running(ndev)) {
 198                         /*
 199                          * Allow only a single IBSS interface to be up at any
 200                          * time. This is restricted because beacon distribution
 201                          * cannot work properly if both are in the same IBSS.
 202                          *
 203                          * To remove this restriction we'd have to disallow them
 204                          * from setting the same SSID on different IBSS interfaces
 205                          * belonging to the same hardware. Then, however, we're
 206                          * faced with having to adopt two different TSF timers...
 207                          */
 208                         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
 209                             nsdata->vif.type == IEEE80211_IF_TYPE_IBSS)
 210                                 return -EBUSY;
 211
 212                         /*
 213                          * The remaining checks are only performed for interfaces
 214                          * with the same MAC address.
 215                          */
 216                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 217                                 continue;
 218
 219                         /*
 220                          * check whether it may have the same address
 221                          */
 222                         if (!identical_mac_addr_allowed(sdata->vif.type,
 223                                                         nsdata->vif.type))
 224                                 return -ENOTUNIQ;
 225
 226                         /*
 227                          * can only add VLANs to enabled APs
 228                          */
 229                         if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN &&
 230                             nsdata->vif.type == IEEE80211_IF_TYPE_AP)
 231                                 sdata->bss = &nsdata->u.ap;
 232                 }
 233         }
 234
 235         switch (sdata->vif.type) {
 236         case IEEE80211_IF_TYPE_WDS:
 237                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 238                         return -ENOLINK;
 239                 break;
 240         case IEEE80211_IF_TYPE_VLAN:
 241                 if (!sdata->bss)
 242                         return -ENOLINK;
 243                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 244                 break;
 245         case IEEE80211_IF_TYPE_AP:
 246                 sdata->bss = &sdata->u.ap;
 247                 break;
 248         case IEEE80211_IF_TYPE_STA:
 249         case IEEE80211_IF_TYPE_MNTR:
 250         case IEEE80211_IF_TYPE_IBSS:
 251         case IEEE80211_IF_TYPE_MESH_POINT:
 252                 /* no special treatment */
 253                 break;
 254         case IEEE80211_IF_TYPE_INVALID:
 255                 /* cannot happen */
 256                 WARN_ON(1);
 257                 break;
 258         }
 259
 260         if (local->open_count == 0) {
 261                 res = 0;
 262                 if (local->ops->start)
 263                         res = local->ops->start(local_to_hw(local));
 264                 if (res)
 265                         goto err_del_bss;
 266                 need_hw_reconfig = 1;
 267                 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
 268         }
 269
 270         switch (sdata->vif.type) {
 271         case IEEE80211_IF_TYPE_VLAN:
 272                 /* no need to tell driver */
 273                 break;
 274         case IEEE80211_IF_TYPE_MNTR:
 275                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 276                         local->cooked_mntrs++;
 277                         break;
 278                 }
 279
 280                 /* must be before the call to ieee80211_configure_filter */
 281                 local->monitors++;
 282                 if (local->monitors == 1)
 283                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 284
 285                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 286                         local->fif_fcsfail++;
 287                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 288                         local->fif_plcpfail++;
 289                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 290                         local->fif_control++;
 291                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 292                         local->fif_other_bss++;
 293
 294                 netif_tx_lock_bh(local->mdev);
 295                 ieee80211_configure_filter(local);
 296                 netif_tx_unlock_bh(local->mdev);
 297                 break;
 298         case IEEE80211_IF_TYPE_STA:
 299         case IEEE80211_IF_TYPE_IBSS:
 300                 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
 301                 /* fall through */
 302         default:
 303                 conf.vif = &sdata->vif;
 304                 conf.type = sdata->vif.type;
 305                 conf.mac_addr = dev->dev_addr;
 306                 res = local->ops->add_interface(local_to_hw(local), &conf);
 307                 if (res)
 308                         goto err_stop;
 309
 310                 ieee80211_if_config(dev);
 311                 changed |= ieee80211_reset_erp_info(dev);
 312                 ieee80211_bss_info_change_notify(sdata, changed);
 313                 ieee80211_enable_keys(sdata);
 314
 315                 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
 316                     !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
 317                         netif_carrier_off(dev);
 318                 else
 319                         netif_carrier_on(dev);
 320         }
 321
 322         if (sdata->vif.type == IEEE80211_IF_TYPE_WDS) {
 323                 /* Create STA entry for the WDS peer */
 324                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 325                                      GFP_KERNEL);
 326                 if (!sta) {
 327                         res = -ENOMEM;
 328                         goto err_del_interface;
 329                 }
 330
 331                 /* no locking required since STA is not live yet */
 332                 sta->flags |= WLAN_STA_AUTHORIZED;
 333
 334                 res = sta_info_insert(sta);
 335                 if (res) {
 336                         /* STA has been freed */
 337                         goto err_del_interface;
 338                 }
 339         }
 340
 341         if (local->open_count == 0) {
 342                 res = dev_open(local->mdev);
 343                 WARN_ON(res);
 344                 if (res)
 345                         goto err_del_interface;
 346                 tasklet_enable(&local->tx_pending_tasklet);
 347                 tasklet_enable(&local->tasklet);
 348         }
 349
 350         /*
 351          * set_multicast_list will be invoked by the networking core
 352          * which will check whether any increments here were done in
 353          * error and sync them down to the hardware as filter flags.
 354          */
 355         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 356                 atomic_inc(&local->iff_allmultis);
 357
 358         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 359                 atomic_inc(&local->iff_promiscs);
 360
 361         local->open_count++;
 362         if (need_hw_reconfig)
 363                 ieee80211_hw_config(local);
 364
 365         /*
 366          * ieee80211_sta_work is disabled while network interface
 367          * is down. Therefore, some configuration changes may not
 368          * yet be effective. Trigger execution of ieee80211_sta_work
 369          * to fix this.
 370          */
 371         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
 372             sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
 373                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 374                 queue_work(local->hw.workqueue, &ifsta->work);
 375         }
 376
 377         netif_start_queue(dev);
 378
 379         return 0;
 380  err_del_interface:
 381         local->ops->remove_interface(local_to_hw(local), &conf);
 382  err_stop:
 383         if (!local->open_count && local->ops->stop)
 384                 local->ops->stop(local_to_hw(local));
 385  err_del_bss:
 386         sdata->bss = NULL;
 387         if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN)
 388                 list_del(&sdata->u.vlan.list);
 389         return res;
 390 }
 391
 392 static int ieee80211_stop(struct net_device *dev)
 393 {
 394         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 395         struct ieee80211_local *local = sdata->local;
 396         struct ieee80211_if_init_conf conf;
 397         struct sta_info *sta;
 398
 399         /*
 400          * Stop TX on this interface first.
 401          */
 402         netif_stop_queue(dev);
 403
 404         /*
 405          * Now delete all active aggregation sessions.
 406          */
 407         rcu_read_lock();
 408
 409         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 410                 if (sta->sdata == sdata)
 411                         ieee80211_sta_tear_down_BA_sessions(dev, sta->addr);
 412         }
 413
 414         rcu_read_unlock();
 415
 416         /*
 417          * Remove all stations associated with this interface.
 418          *
 419          * This must be done before calling ops->remove_interface()
 420          * because otherwise we can later invoke ops->sta_notify()
 421          * whenever the STAs are removed, and that invalidates driver
 422          * assumptions about always getting a vif pointer that is valid
 423          * (because if we remove a STA after ops->remove_interface()
 424          * the driver will have removed the vif info already!)
 425          *
 426          * We could relax this and only unlink the stations from the
 427          * hash table and list but keep them on a per-sdata list that
 428          * will be inserted back again when the interface is brought
 429          * up again, but I don't currently see a use case for that,
 430          * except with WDS which gets a STA entry created when it is
 431          * brought up.
 432          */
 433         sta_info_flush(local, sdata);
 434
 435         /*
 436          * Don't count this interface for promisc/allmulti while it
 437          * is down. dev_mc_unsync() will invoke set_multicast_list
 438          * on the master interface which will sync these down to the
 439          * hardware as filter flags.
 440          */
 441         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 442                 atomic_dec(&local->iff_allmultis);
 443
 444         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 445                 atomic_dec(&local->iff_promiscs);
 446
 447         dev_mc_unsync(local->mdev, dev);
 448
 449         /* APs need special treatment */
 450         if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
 451                 struct ieee80211_sub_if_data *vlan, *tmp;
 452                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 453
 454                 /* remove beacon */
 455                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 456                 synchronize_rcu();
 457                 kfree(old_beacon);
 458
 459                 /* down all dependent devices, that is VLANs */
 460                 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
 461                                          u.vlan.list)
 462                         dev_close(vlan->dev);
 463                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 464         }
 465
 466         local->open_count--;
 467
 468         switch (sdata->vif.type) {
 469         case IEEE80211_IF_TYPE_VLAN:
 470                 list_del(&sdata->u.vlan.list);
 471                 /* no need to tell driver */
 472                 break;
 473         case IEEE80211_IF_TYPE_MNTR:
 474                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 475                         local->cooked_mntrs--;
 476                         break;
 477                 }
 478
 479                 local->monitors--;
 480                 if (local->monitors == 0)
 481                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
 482
 483                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 484                         local->fif_fcsfail--;
 485                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 486                         local->fif_plcpfail--;
 487                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 488                         local->fif_control--;
 489                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 490                         local->fif_other_bss--;
 491
 492                 netif_tx_lock_bh(local->mdev);
 493                 ieee80211_configure_filter(local);
 494                 netif_tx_unlock_bh(local->mdev);
 495                 break;
 496         case IEEE80211_IF_TYPE_MESH_POINT:
 497         case IEEE80211_IF_TYPE_STA:
 498         case IEEE80211_IF_TYPE_IBSS:
 499                 sdata->u.sta.state = IEEE80211_DISABLED;
 500                 memset(sdata->u.sta.bssid, 0, ETH_ALEN);
 501                 del_timer_sync(&sdata->u.sta.timer);
 502                 /*
 503                  * When we get here, the interface is marked down.
 504                  * Call synchronize_rcu() to wait for the RX path
 505                  * should it be using the interface and enqueuing
 506                  * frames at this very time on another CPU.
 507                  */
 508                 synchronize_rcu();
 509                 skb_queue_purge(&sdata->u.sta.skb_queue);
 510
 511                 if (local->scan_dev == sdata->dev) {
 512                         if (!local->ops->hw_scan) {
 513                                 local->sta_sw_scanning = 0;
 514                                 cancel_delayed_work(&local->scan_work);
 515                         } else
 516                                 local->sta_hw_scanning = 0;
 517                 }
 518
 519                 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
 520                 kfree(sdata->u.sta.extra_ie);
 521                 sdata->u.sta.extra_ie = NULL;
 522                 sdata->u.sta.extra_ie_len = 0;
 523                 /* fall through */
 524         default:
 525                 conf.vif = &sdata->vif;
 526                 conf.type = sdata->vif.type;
 527                 conf.mac_addr = dev->dev_addr;
 528                 /* disable all keys for as long as this netdev is down */
 529                 ieee80211_disable_keys(sdata);
 530                 local->ops->remove_interface(local_to_hw(local), &conf);
 531         }
 532
 533         sdata->bss = NULL;
 534
 535         if (local->open_count == 0) {
 536                 if (netif_running(local->mdev))
 537                         dev_close(local->mdev);
 538
 539                 if (local->ops->stop)
 540                         local->ops->stop(local_to_hw(local));
 541
 542                 ieee80211_led_radio(local, 0);
 543
 544                 flush_workqueue(local->hw.workqueue);
 545
 546                 tasklet_disable(&local->tx_pending_tasklet);
 547                 tasklet_disable(&local->tasklet);
 548         }
 549
 550         return 0;
 551 }
 552
 553 int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid)
 554 {
 555         struct ieee80211_local *local = hw_to_local(hw);
 556         struct netdev_queue *txq;
 557         struct sta_info *sta;
 558         struct ieee80211_sub_if_data *sdata;
 559         u16 start_seq_num = 0;
 560         u8 *state;
 561         int ret;
 562         DECLARE_MAC_BUF(mac);
 563
 564         if (tid >= STA_TID_NUM)
 565                 return -EINVAL;
 566
 567 #ifdef CONFIG_MAC80211_HT_DEBUG
 568         printk(KERN_DEBUG "Open BA session requested for %s tid %u\n",
 569                                 print_mac(mac, ra), tid);
 570 #endif /* CONFIG_MAC80211_HT_DEBUG */
 571
 572         rcu_read_lock();
 573
 574         sta = sta_info_get(local, ra);
 575         if (!sta) {
 576 #ifdef CONFIG_MAC80211_HT_DEBUG
 577                 printk(KERN_DEBUG "Could not find the station\n");
 578 #endif
 579                 ret = -ENOENT;
 580                 goto exit;
 581         }
 582
 583         spin_lock_bh(&sta->lock);
 584
 585         /* we have tried too many times, receiver does not want A-MPDU */
 586         if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
 587                 ret = -EBUSY;
 588                 goto err_unlock_sta;
 589         }
 590
 591         state = &sta->ampdu_mlme.tid_state_tx[tid];
 592         /* check if the TID is not in aggregation flow already */
 593         if (*state != HT_AGG_STATE_IDLE) {
 594 #ifdef CONFIG_MAC80211_HT_DEBUG
 595                 printk(KERN_DEBUG "BA request denied - session is not "
 596                                  "idle on tid %u\n", tid);
 597 #endif /* CONFIG_MAC80211_HT_DEBUG */
 598                 ret = -EAGAIN;
 599                 goto err_unlock_sta;
 600         }
 601
 602         /* prepare A-MPDU MLME for Tx aggregation */
 603         sta->ampdu_mlme.tid_tx[tid] =
 604                         kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
 605         if (!sta->ampdu_mlme.tid_tx[tid]) {
 606 #ifdef CONFIG_MAC80211_HT_DEBUG
 607                 if (net_ratelimit())
 608                         printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
 609                                         tid);
 610 #endif
 611                 ret = -ENOMEM;
 612                 goto err_unlock_sta;
 613         }
 614         /* Tx timer */
 615         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function =
 616                         sta_addba_resp_timer_expired;
 617         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data =
 618                         (unsigned long)&sta->timer_to_tid[tid];
 619         init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
 620
 621         /* ensure that TX flow won't interrupt us
 622          * until the end of the call to requeue function */
 623         txq = &local->mdev->tx_queue;
 624         spin_lock_bh(&txq->lock);
 625
 626         /* create a new queue for this aggregation */
 627         ret = ieee80211_ht_agg_queue_add(local, sta, tid);
 628
 629         /* case no queue is available to aggregation
 630          * don't switch to aggregation */
 631         if (ret) {
 632 #ifdef CONFIG_MAC80211_HT_DEBUG
 633                 printk(KERN_DEBUG "BA request denied - queue unavailable for"
 634                                         " tid %d\n", tid);
 635 #endif /* CONFIG_MAC80211_HT_DEBUG */
 636                 goto err_unlock_queue;
 637         }
 638         sdata = sta->sdata;
 639
 640         /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
 641          * call back right away, it must see that the flow has begun */
 642         *state |= HT_ADDBA_REQUESTED_MSK;
 643
 644         if (local->ops->ampdu_action)
 645                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
 646                                                 ra, tid, &start_seq_num);
 647
 648         if (ret) {
 649                 /* No need to requeue the packets in the agg queue, since we
 650                  * held the tx lock: no packet could be enqueued to the newly
 651                  * allocated queue */
 652                  ieee80211_ht_agg_queue_remove(local, sta, tid, 0);
 653 #ifdef CONFIG_MAC80211_HT_DEBUG
 654                 printk(KERN_DEBUG "BA request denied - HW unavailable for"
 655                                         " tid %d\n", tid);
 656 #endif /* CONFIG_MAC80211_HT_DEBUG */
 657                 *state = HT_AGG_STATE_IDLE;
 658                 goto err_unlock_queue;
 659         }
 660
 661         /* Will put all the packets in the new SW queue */
 662         ieee80211_requeue(local, ieee802_1d_to_ac[tid]);
 663         spin_unlock_bh(&txq->lock);
 664         spin_unlock_bh(&sta->lock);
 665
 666         /* send an addBA request */
 667         sta->ampdu_mlme.dialog_token_allocator++;
 668         sta->ampdu_mlme.tid_tx[tid]->dialog_token =
 669                         sta->ampdu_mlme.dialog_token_allocator;
 670         sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
 671
 672
 673         ieee80211_send_addba_request(sta->sdata->dev, ra, tid,
 674                          sta->ampdu_mlme.tid_tx[tid]->dialog_token,
 675                          sta->ampdu_mlme.tid_tx[tid]->ssn,
 676                          0x40, 5000);
 677         /* activate the timer for the recipient's addBA response */
 678         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
 679                                 jiffies + ADDBA_RESP_INTERVAL;
 680         add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
 681 #ifdef CONFIG_MAC80211_HT_DEBUG
 682         printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
 683 #endif
 684         goto exit;
 685
 686 err_unlock_queue:
 687         kfree(sta->ampdu_mlme.tid_tx[tid]);
 688         sta->ampdu_mlme.tid_tx[tid] = NULL;
 689         spin_unlock_bh(&txq->lock);
 690         ret = -EBUSY;
 691 err_unlock_sta:
 692         spin_unlock_bh(&sta->lock);
 693 exit:
 694         rcu_read_unlock();
 695         return ret;
 696 }
 697 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
 698
 699 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
 700                                  u8 *ra, u16 tid,
 701                                  enum ieee80211_back_parties initiator)
 702 {
 703         struct ieee80211_local *local = hw_to_local(hw);
 704         struct sta_info *sta;
 705         u8 *state;
 706         int ret = 0;
 707         DECLARE_MAC_BUF(mac);
 708
 709         if (tid >= STA_TID_NUM)
 710                 return -EINVAL;
 711
 712         rcu_read_lock();
 713         sta = sta_info_get(local, ra);
 714         if (!sta) {
 715                 rcu_read_unlock();
 716                 return -ENOENT;
 717         }
 718
 719         /* check if the TID is in aggregation */
 720         state = &sta->ampdu_mlme.tid_state_tx[tid];
 721         spin_lock_bh(&sta->lock);
 722
 723         if (*state != HT_AGG_STATE_OPERATIONAL) {
 724                 ret = -ENOENT;
 725                 goto stop_BA_exit;
 726         }
 727
 728 #ifdef CONFIG_MAC80211_HT_DEBUG
 729         printk(KERN_DEBUG "Tx BA session stop requested for %s tid %u\n",
 730                                 print_mac(mac, ra), tid);
 731 #endif /* CONFIG_MAC80211_HT_DEBUG */
 732
 733         ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]);
 734
 735         *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
 736                 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
 737
 738         if (local->ops->ampdu_action)
 739                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP,
 740                                                 ra, tid, NULL);
 741
 742         /* case HW denied going back to legacy */
 743         if (ret) {
 744                 WARN_ON(ret != -EBUSY);
 745                 *state = HT_AGG_STATE_OPERATIONAL;
 746                 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
 747                 goto stop_BA_exit;
 748         }
 749
 750 stop_BA_exit:
 751         spin_unlock_bh(&sta->lock);
 752         rcu_read_unlock();
 753         return ret;
 754 }
 755 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
 756
 757 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
 758 {
 759         struct ieee80211_local *local = hw_to_local(hw);
 760         struct sta_info *sta;
 761         u8 *state;
 762         DECLARE_MAC_BUF(mac);
 763
 764         if (tid >= STA_TID_NUM) {
 765 #ifdef CONFIG_MAC80211_HT_DEBUG
 766                 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
 767                                 tid, STA_TID_NUM);
 768 #endif
 769                 return;
 770         }
 771
 772         rcu_read_lock();
 773         sta = sta_info_get(local, ra);
 774         if (!sta) {
 775                 rcu_read_unlock();
 776 #ifdef CONFIG_MAC80211_HT_DEBUG
 777                 printk(KERN_DEBUG "Could not find station: %s\n",
 778                                 print_mac(mac, ra));
 779 #endif
 780                 return;
 781         }
 782
 783         state = &sta->ampdu_mlme.tid_state_tx[tid];
 784         spin_lock_bh(&sta->lock);
 785
 786         if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
 787 #ifdef CONFIG_MAC80211_HT_DEBUG
 788                 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
 789                                 *state);
 790 #endif
 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 #ifdef CONFIG_MAC80211_HT_DEBUG
 802                 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
 803 #endif
 804                 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
 805         }
 806         spin_unlock_bh(&sta->lock);
 807         rcu_read_unlock();
 808 }
 809 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
 810
 811 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
 812 {
 813         struct ieee80211_local *local = hw_to_local(hw);
 814         struct netdev_queue *txq;
 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 #ifdef CONFIG_MAC80211_HT_DEBUG
 822                 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
 823                                 tid, STA_TID_NUM);
 824 #endif
 825                 return;
 826         }
 827
 828 #ifdef CONFIG_MAC80211_HT_DEBUG
 829         printk(KERN_DEBUG "Stopping Tx BA session for %s tid %d\n",
 830                                 print_mac(mac, ra), tid);
 831 #endif /* CONFIG_MAC80211_HT_DEBUG */
 832
 833         rcu_read_lock();
 834         sta = sta_info_get(local, ra);
 835         if (!sta) {
 836 #ifdef CONFIG_MAC80211_HT_DEBUG
 837                 printk(KERN_DEBUG "Could not find station: %s\n",
 838                                 print_mac(mac, ra));
 839 #endif
 840                 rcu_read_unlock();
 841                 return;
 842         }
 843         state = &sta->ampdu_mlme.tid_state_tx[tid];
 844
 845         /* NOTE: no need to use sta->lock in this state check, as
 846          * ieee80211_stop_tx_ba_session will let only
 847          * one stop call to pass through per sta/tid */
 848         if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
 849 #ifdef CONFIG_MAC80211_HT_DEBUG
 850                 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
 851 #endif
 852                 rcu_read_unlock();
 853                 return;
 854         }
 855
 856         if (*state & HT_AGG_STATE_INITIATOR_MSK)
 857                 ieee80211_send_delba(sta->sdata->dev, ra, tid,
 858                         WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
 859
 860         agg_queue = sta->tid_to_tx_q[tid];
 861
 862         /* avoid ordering issues: we are the only one that can modify
 863          * the content of the qdiscs */
 864         txq = &local->mdev->tx_queue;
 865         spin_lock_bh(&txq->lock);
 866         /* remove the queue for this aggregation */
 867         ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
 868         spin_unlock_bh(&txq->lock);
 869
 870         /* we just requeued the all the frames that were in the removed
 871          * queue, and since we might miss a softirq we do netif_schedule_queue.
 872          * ieee80211_wake_queue is not used here as this queue is not
 873          * necessarily stopped */
 874         netif_schedule_queue(txq);
 875         spin_lock_bh(&sta->lock);
 876         *state = HT_AGG_STATE_IDLE;
 877         sta->ampdu_mlme.addba_req_num[tid] = 0;
 878         kfree(sta->ampdu_mlme.tid_tx[tid]);
 879         sta->ampdu_mlme.tid_tx[tid] = NULL;
 880         spin_unlock_bh(&sta->lock);
 881
 882         rcu_read_unlock();
 883 }
 884 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
 885
 886 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
 887                                       const u8 *ra, u16 tid)
 888 {
 889         struct ieee80211_local *local = hw_to_local(hw);
 890         struct ieee80211_ra_tid *ra_tid;
 891         struct sk_buff *skb = dev_alloc_skb(0);
 892
 893         if (unlikely(!skb)) {
 894 #ifdef CONFIG_MAC80211_HT_DEBUG
 895                 if (net_ratelimit())
 896                         printk(KERN_WARNING "%s: Not enough memory, "
 897                                "dropping start BA session", skb->dev->name);
 898 #endif
 899                 return;
 900         }
 901         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 902         memcpy(&ra_tid->ra, ra, ETH_ALEN);
 903         ra_tid->tid = tid;
 904
 905         skb->pkt_type = IEEE80211_ADDBA_MSG;
 906         skb_queue_tail(&local->skb_queue, skb);
 907         tasklet_schedule(&local->tasklet);
 908 }
 909 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
 910
 911 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
 912                                      const u8 *ra, u16 tid)
 913 {
 914         struct ieee80211_local *local = hw_to_local(hw);
 915         struct ieee80211_ra_tid *ra_tid;
 916         struct sk_buff *skb = dev_alloc_skb(0);
 917
 918         if (unlikely(!skb)) {
 919 #ifdef CONFIG_MAC80211_HT_DEBUG
 920                 if (net_ratelimit())
 921                         printk(KERN_WARNING "%s: Not enough memory, "
 922                                "dropping stop BA session", skb->dev->name);
 923 #endif
 924                 return;
 925         }
 926         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 927         memcpy(&ra_tid->ra, ra, ETH_ALEN);
 928         ra_tid->tid = tid;
 929
 930         skb->pkt_type = IEEE80211_DELBA_MSG;
 931         skb_queue_tail(&local->skb_queue, skb);
 932         tasklet_schedule(&local->tasklet);
 933 }
 934 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
 935
 936 static void ieee80211_set_multicast_list(struct net_device *dev)
 937 {
 938         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 939         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 940         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 941
 942         allmulti = !!(dev->flags & IFF_ALLMULTI);
 943         promisc = !!(dev->flags & IFF_PROMISC);
 944         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 945         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 946
 947         if (allmulti != sdata_allmulti) {
 948                 if (dev->flags & IFF_ALLMULTI)
 949                         atomic_inc(&local->iff_allmultis);
 950                 else
 951                         atomic_dec(&local->iff_allmultis);
 952                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 953         }
 954
 955         if (promisc != sdata_promisc) {
 956                 if (dev->flags & IFF_PROMISC)
 957                         atomic_inc(&local->iff_promiscs);
 958                 else
 959                         atomic_dec(&local->iff_promiscs);
 960                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 961         }
 962
 963         dev_mc_sync(local->mdev, dev);
 964 }
 965
 966 static const struct header_ops ieee80211_header_ops = {
 967         .create         = eth_header,
 968         .parse          = header_parse_80211,
 969         .rebuild        = eth_rebuild_header,
 970         .cache          = eth_header_cache,
 971         .cache_update   = eth_header_cache_update,
 972 };
 973
 974 void ieee80211_if_setup(struct net_device *dev)
 975 {
 976         ether_setup(dev);
 977         dev->hard_start_xmit = ieee80211_subif_start_xmit;
 978         dev->wireless_handlers = &ieee80211_iw_handler_def;
 979         dev->set_multicast_list = ieee80211_set_multicast_list;
 980         dev->change_mtu = ieee80211_change_mtu;
 981         dev->open = ieee80211_open;
 982         dev->stop = ieee80211_stop;
 983         dev->destructor = free_netdev;
 984 }
 985
 986 /* everything else */
 987
 988 static int __ieee80211_if_config(struct net_device *dev,
 989                                  struct sk_buff *beacon)
 990 {
 991         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 992         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 993         struct ieee80211_if_conf conf;
 994
 995         if (!local->ops->config_interface || !netif_running(dev))
 996                 return 0;
 997
 998         memset(&conf, 0, sizeof(conf));
 999         conf.type = sdata->vif.type;
1000         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
1001             sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
1002                 conf.bssid = sdata->u.sta.bssid;
1003                 conf.ssid = sdata->u.sta.ssid;
1004                 conf.ssid_len = sdata->u.sta.ssid_len;
1005         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
1006                 conf.beacon = beacon;
1007                 ieee80211_start_mesh(dev);
1008         } else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
1009                 conf.ssid = sdata->u.ap.ssid;
1010                 conf.ssid_len = sdata->u.ap.ssid_len;
1011                 conf.beacon = beacon;
1012         }
1013         return local->ops->config_interface(local_to_hw(local),
1014                                             &sdata->vif, &conf);
1015 }
1016
1017 int ieee80211_if_config(struct net_device *dev)
1018 {
1019         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1020         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1021         if (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT &&
1022             (local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
1023                 return ieee80211_if_config_beacon(dev);
1024         return __ieee80211_if_config(dev, NULL);
1025 }
1026
1027 int ieee80211_if_config_beacon(struct net_device *dev)
1028 {
1029         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1030         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1031         struct sk_buff *skb;
1032
1033         if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
1034                 return 0;
1035         skb = ieee80211_beacon_get(local_to_hw(local), &sdata->vif);
1036         if (!skb)
1037                 return -ENOMEM;
1038         return __ieee80211_if_config(dev, skb);
1039 }
1040
1041 int ieee80211_hw_config(struct ieee80211_local *local)
1042 {
1043         struct ieee80211_channel *chan;
1044         int ret = 0;
1045
1046         if (local->sta_sw_scanning)
1047                 chan = local->scan_channel;
1048         else
1049                 chan = local->oper_channel;
1050
1051         local->hw.conf.channel = chan;
1052
1053         if (!local->hw.conf.power_level)
1054                 local->hw.conf.power_level = chan->max_power;
1055         else
1056                 local->hw.conf.power_level = min(chan->max_power,
1057                                                local->hw.conf.power_level);
1058
1059         local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
1060
1061 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1062         printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
1063                wiphy_name(local->hw.wiphy), chan->center_freq);
1064 #endif
1065
1066         if (local->open_count)
1067                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
1068
1069         return ret;
1070 }
1071
1072 /**
1073  * ieee80211_handle_ht should be used only after legacy configuration
1074  * has been determined namely band, as ht configuration depends upon
1075  * the hardware's HT abilities for a _specific_ band.
1076  */
1077 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
1078                            struct ieee80211_ht_info *req_ht_cap,
1079                            struct ieee80211_ht_bss_info *req_bss_cap)
1080 {
1081         struct ieee80211_conf *conf = &local->hw.conf;
1082         struct ieee80211_supported_band *sband;
1083         struct ieee80211_ht_info ht_conf;
1084         struct ieee80211_ht_bss_info ht_bss_conf;
1085         u32 changed = 0;
1086         int i;
1087         u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS;
1088         u8 tx_mcs_set_cap;
1089
1090         sband = local->hw.wiphy->bands[conf->channel->band];
1091
1092         memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
1093         memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
1094
1095         /* HT is not supported */
1096         if (!sband->ht_info.ht_supported) {
1097                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1098                 goto out;
1099         }
1100
1101         /* disable HT */
1102         if (!enable_ht) {
1103                 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
1104                         changed |= BSS_CHANGED_HT;
1105                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1106                 conf->ht_conf.ht_supported = 0;
1107                 goto out;
1108         }
1109
1110
1111         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
1112                 changed |= BSS_CHANGED_HT;
1113
1114         conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
1115         ht_conf.ht_supported = 1;
1116
1117         ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
1118         ht_conf.cap &= ~(IEEE80211_HT_CAP_MIMO_PS);
1119         ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_MIMO_PS;
1120         ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
1121         ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
1122         ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
1123
1124         ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
1125         ht_conf.ampdu_density = req_ht_cap->ampdu_density;
1126
1127         /* Bits 96-100 */
1128         tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12];
1129
1130         /* configure suppoerted Tx MCS according to requested MCS
1131          * (based in most cases on Rx capabilities of peer) and self
1132          * Tx MCS capabilities (as defined by low level driver HW
1133          * Tx capabilities) */
1134         if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED))
1135                 goto check_changed;
1136
1137         /* Counting from 0 therfore + 1 */
1138         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF)
1139                 max_tx_streams = ((tx_mcs_set_cap &
1140                                 IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1;
1141
1142         for (i = 0; i < max_tx_streams; i++)
1143                 ht_conf.supp_mcs_set[i] =
1144                         sband->ht_info.supp_mcs_set[i] &
1145                                         req_ht_cap->supp_mcs_set[i];
1146
1147         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM)
1148                 for (i = IEEE80211_SUPP_MCS_SET_UEQM;
1149                      i < IEEE80211_SUPP_MCS_SET_LEN; i++)
1150                         ht_conf.supp_mcs_set[i] =
1151                                 sband->ht_info.supp_mcs_set[i] &
1152                                         req_ht_cap->supp_mcs_set[i];
1153
1154 check_changed:
1155         /* if bss configuration changed store the new one */
1156         if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
1157             memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
1158                 changed |= BSS_CHANGED_HT;
1159                 memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
1160                 memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
1161         }
1162 out:
1163         return changed;
1164 }
1165
1166 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1167                                       u32 changed)
1168 {
1169         struct ieee80211_local *local = sdata->local;
1170
1171         if (!changed)
1172                 return;
1173
1174         if (local->ops->bss_info_changed)
1175                 local->ops->bss_info_changed(local_to_hw(local),
1176                                              &sdata->vif,
1177                                              &sdata->bss_conf,
1178                                              changed);
1179 }
1180
1181 u32 ieee80211_reset_erp_info(struct net_device *dev)
1182 {
1183         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1184
1185         sdata->bss_conf.use_cts_prot = 0;
1186         sdata->bss_conf.use_short_preamble = 0;
1187         return BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE;
1188 }
1189
1190 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
1191                                  struct sk_buff *skb)
1192 {
1193         struct ieee80211_local *local = hw_to_local(hw);
1194         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1195         int tmp;
1196
1197         skb->dev = local->mdev;
1198         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
1199         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
1200                        &local->skb_queue : &local->skb_queue_unreliable, skb);
1201         tmp = skb_queue_len(&local->skb_queue) +
1202                 skb_queue_len(&local->skb_queue_unreliable);
1203         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
1204                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1205                 dev_kfree_skb_irq(skb);
1206                 tmp--;
1207                 I802_DEBUG_INC(local->tx_status_drop);
1208         }
1209         tasklet_schedule(&local->tasklet);
1210 }
1211 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
1212
1213 static void ieee80211_tasklet_handler(unsigned long data)
1214 {
1215         struct ieee80211_local *local = (struct ieee80211_local *) data;
1216         struct sk_buff *skb;
1217         struct ieee80211_rx_status rx_status;
1218         struct ieee80211_ra_tid *ra_tid;
1219
1220         while ((skb = skb_dequeue(&local->skb_queue)) ||
1221                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1222                 switch (skb->pkt_type) {
1223                 case IEEE80211_RX_MSG:
1224                         /* status is in skb->cb */
1225                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
1226                         /* Clear skb->pkt_type in order to not confuse kernel
1227                          * netstack. */
1228                         skb->pkt_type = 0;
1229                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
1230                         break;
1231                 case IEEE80211_TX_STATUS_MSG:
1232                         skb->pkt_type = 0;
1233                         ieee80211_tx_status(local_to_hw(local), skb);
1234                         break;
1235                 case IEEE80211_DELBA_MSG:
1236                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1237                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
1238                                                 ra_tid->ra, ra_tid->tid);
1239                         dev_kfree_skb(skb);
1240                         break;
1241                 case IEEE80211_ADDBA_MSG:
1242                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1243                         ieee80211_start_tx_ba_cb(local_to_hw(local),
1244                                                  ra_tid->ra, ra_tid->tid);
1245                         dev_kfree_skb(skb);
1246                         break ;
1247                 default:
1248                         WARN_ON(1);
1249                         dev_kfree_skb(skb);
1250                         break;
1251                 }
1252         }
1253 }
1254
1255 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
1256  * make a prepared TX frame (one that has been given to hw) to look like brand
1257  * new IEEE 802.11 frame that is ready to go through TX processing again.
1258  * Also, tx_packet_data in cb is restored from tx_control. */
1259 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
1260                                       struct ieee80211_key *key,
1261                                       struct sk_buff *skb)
1262 {
1263         int hdrlen, iv_len, mic_len;
1264         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1265
1266         info->flags &=  IEEE80211_TX_CTL_REQ_TX_STATUS |
1267                         IEEE80211_TX_CTL_DO_NOT_ENCRYPT |
1268                         IEEE80211_TX_CTL_REQUEUE |
1269                         IEEE80211_TX_CTL_EAPOL_FRAME;
1270
1271         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1272
1273         if (!key)
1274                 goto no_key;
1275
1276         switch (key->conf.alg) {
1277         case ALG_WEP:
1278                 iv_len = WEP_IV_LEN;
1279                 mic_len = WEP_ICV_LEN;
1280                 break;
1281         case ALG_TKIP:
1282                 iv_len = TKIP_IV_LEN;
1283                 mic_len = TKIP_ICV_LEN;
1284                 break;
1285         case ALG_CCMP:
1286                 iv_len = CCMP_HDR_LEN;
1287                 mic_len = CCMP_MIC_LEN;
1288                 break;
1289         default:
1290                 goto no_key;
1291         }
1292
1293         if (skb->len >= mic_len &&
1294             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
1295                 skb_trim(skb, skb->len - mic_len);
1296         if (skb->len >= iv_len && skb->len > hdrlen) {
1297                 memmove(skb->data + iv_len, skb->data, hdrlen);
1298                 skb_pull(skb, iv_len);
1299         }
1300
1301 no_key:
1302         {
1303                 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1304                 u16 fc = le16_to_cpu(hdr->frame_control);
1305                 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
1306                         fc &= ~IEEE80211_STYPE_QOS_DATA;
1307                         hdr->frame_control = cpu_to_le16(fc);
1308                         memmove(skb->data + 2, skb->data, hdrlen - 2);
1309                         skb_pull(skb, 2);
1310                 }
1311         }
1312 }
1313
1314 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
1315                                             struct sta_info *sta,
1316                                             struct sk_buff *skb)
1317 {
1318         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1319
1320         sta->tx_filtered_count++;
1321
1322         /*
1323          * Clear the TX filter mask for this STA when sending the next
1324          * packet. If the STA went to power save mode, this will happen
1325          * when it wakes up for the next time.
1326          */
1327         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
1328
1329         /*
1330          * This code races in the following way:
1331          *
1332          *  (1) STA sends frame indicating it will go to sleep and does so
1333          *  (2) hardware/firmware adds STA to filter list, passes frame up
1334          *  (3) hardware/firmware processes TX fifo and suppresses a frame
1335          *  (4) we get TX status before having processed the frame and
1336          *      knowing that the STA has gone to sleep.
1337          *
1338          * This is actually quite unlikely even when both those events are
1339          * processed from interrupts coming in quickly after one another or
1340          * even at the same time because we queue both TX status events and
1341          * RX frames to be processed by a tasklet and process them in the
1342          * same order that they were received or TX status last. Hence, there
1343          * is no race as long as the frame RX is processed before the next TX
1344          * status, which drivers can ensure, see below.
1345          *
1346          * Note that this can only happen if the hardware or firmware can
1347          * actually add STAs to the filter list, if this is done by the
1348          * driver in response to set_tim() (which will only reduce the race
1349          * this whole filtering tries to solve, not completely solve it)
1350          * this situation cannot happen.
1351          *
1352          * To completely solve this race drivers need to make sure that they
1353          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
1354          *      functions and
1355          *  (b) always process RX events before TX status events if ordering
1356          *      can be unknown, for example with different interrupt status
1357          *      bits.
1358          */
1359         if (test_sta_flags(sta, WLAN_STA_PS) &&
1360             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
1361                 ieee80211_remove_tx_extra(local, sta->key, skb);
1362                 skb_queue_tail(&sta->tx_filtered, skb);
1363                 return;
1364         }
1365
1366         if (!test_sta_flags(sta, WLAN_STA_PS) &&
1367             !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
1368                 /* Software retry the packet once */
1369                 info->flags |= IEEE80211_TX_CTL_REQUEUE;
1370                 ieee80211_remove_tx_extra(local, sta->key, skb);
1371                 dev_queue_xmit(skb);
1372                 return;
1373         }
1374
1375 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1376         if (net_ratelimit())
1377                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
1378                        "queue_len=%d PS=%d @%lu\n",
1379                        wiphy_name(local->hw.wiphy),
1380                        skb_queue_len(&sta->tx_filtered),
1381                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
1382 #endif
1383         dev_kfree_skb(skb);
1384 }
1385
1386 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1387 {
1388         struct sk_buff *skb2;
1389         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1390         struct ieee80211_local *local = hw_to_local(hw);
1391         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1392         u16 frag, type;
1393         __le16 fc;
1394         struct ieee80211_tx_status_rtap_hdr *rthdr;
1395         struct ieee80211_sub_if_data *sdata;
1396         struct net_device *prev_dev = NULL;
1397         struct sta_info *sta;
1398
1399         rcu_read_lock();
1400
1401         if (info->status.excessive_retries) {
1402                 sta = sta_info_get(local, hdr->addr1);
1403                 if (sta) {
1404                         if (test_sta_flags(sta, WLAN_STA_PS)) {
1405                                 /*
1406                                  * The STA is in power save mode, so assume
1407                                  * that this TX packet failed because of that.
1408                                  */
1409                                 ieee80211_handle_filtered_frame(local, sta, skb);
1410                                 rcu_read_unlock();
1411                                 return;
1412                         }
1413                 }
1414         }
1415
1416         fc = hdr->frame_control;
1417
1418         if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
1419             (ieee80211_is_data_qos(fc))) {
1420                 u16 tid, ssn;
1421                 u8 *qc;
1422                 sta = sta_info_get(local, hdr->addr1);
1423                 if (sta) {
1424                         qc = ieee80211_get_qos_ctl(hdr);
1425                         tid = qc[0] & 0xf;
1426                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
1427                                                 & IEEE80211_SCTL_SEQ);
1428                         ieee80211_send_bar(sta->sdata->dev, hdr->addr1,
1429                                            tid, ssn);
1430                 }
1431         }
1432
1433         if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
1434                 sta = sta_info_get(local, hdr->addr1);
1435                 if (sta) {
1436                         ieee80211_handle_filtered_frame(local, sta, skb);
1437                         rcu_read_unlock();
1438                         return;
1439                 }
1440         } else
1441                 rate_control_tx_status(local->mdev, skb);
1442
1443         rcu_read_unlock();
1444
1445         ieee80211_led_tx(local, 0);
1446
1447         /* SNMP counters
1448          * Fragments are passed to low-level drivers as separate skbs, so these
1449          * are actually fragments, not frames. Update frame counters only for
1450          * the first fragment of the frame. */
1451
1452         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
1453         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
1454
1455         if (info->flags & IEEE80211_TX_STAT_ACK) {
1456                 if (frag == 0) {
1457                         local->dot11TransmittedFrameCount++;
1458                         if (is_multicast_ether_addr(hdr->addr1))
1459                                 local->dot11MulticastTransmittedFrameCount++;
1460                         if (info->status.retry_count > 0)
1461                                 local->dot11RetryCount++;
1462                         if (info->status.retry_count > 1)
1463                                 local->dot11MultipleRetryCount++;
1464                 }
1465
1466                 /* This counter shall be incremented for an acknowledged MPDU
1467                  * with an individual address in the address 1 field or an MPDU
1468                  * with a multicast address in the address 1 field of type Data
1469                  * or Management. */
1470                 if (!is_multicast_ether_addr(hdr->addr1) ||
1471                     type == IEEE80211_FTYPE_DATA ||
1472                     type == IEEE80211_FTYPE_MGMT)
1473                         local->dot11TransmittedFragmentCount++;
1474         } else {
1475                 if (frag == 0)
1476                         local->dot11FailedCount++;
1477         }
1478
1479         /* this was a transmitted frame, but now we want to reuse it */
1480         skb_orphan(skb);
1481
1482         /*
1483          * This is a bit racy but we can avoid a lot of work
1484          * with this test...
1485          */
1486         if (!local->monitors && !local->cooked_mntrs) {
1487                 dev_kfree_skb(skb);
1488                 return;
1489         }
1490
1491         /* send frame to monitor interfaces now */
1492
1493         if (skb_headroom(skb) < sizeof(*rthdr)) {
1494                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
1495                 dev_kfree_skb(skb);
1496                 return;
1497         }
1498
1499         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
1500                                 skb_push(skb, sizeof(*rthdr));
1501
1502         memset(rthdr, 0, sizeof(*rthdr));
1503         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1504         rthdr->hdr.it_present =
1505                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
1506                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
1507
1508         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
1509             !is_multicast_ether_addr(hdr->addr1))
1510                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
1511
1512         if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
1513             (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
1514                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
1515         else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
1516                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
1517
1518         rthdr->data_retries = info->status.retry_count;
1519
1520         /* XXX: is this sufficient for BPF? */
1521         skb_set_mac_header(skb, 0);
1522         skb->ip_summed = CHECKSUM_UNNECESSARY;
1523         skb->pkt_type = PACKET_OTHERHOST;
1524         skb->protocol = htons(ETH_P_802_2);
1525         memset(skb->cb, 0, sizeof(skb->cb));
1526
1527         rcu_read_lock();
1528         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1529                 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) {
1530                         if (!netif_running(sdata->dev))
1531                                 continue;
1532
1533                         if (prev_dev) {
1534                                 skb2 = skb_clone(skb, GFP_ATOMIC);
1535                                 if (skb2) {
1536                                         skb2->dev = prev_dev;
1537                                         netif_rx(skb2);
1538                                 }
1539                         }
1540
1541                         prev_dev = sdata->dev;
1542                 }
1543         }
1544         if (prev_dev) {
1545                 skb->dev = prev_dev;
1546                 netif_rx(skb);
1547                 skb = NULL;
1548         }
1549         rcu_read_unlock();
1550         dev_kfree_skb(skb);
1551 }
1552 EXPORT_SYMBOL(ieee80211_tx_status);
1553
1554 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1555                                         const struct ieee80211_ops *ops)
1556 {
1557         struct ieee80211_local *local;
1558         int priv_size;
1559         struct wiphy *wiphy;
1560
1561         /* Ensure 32-byte alignment of our private data and hw private data.
1562          * We use the wiphy priv data for both our ieee80211_local and for
1563          * the driver's private data
1564          *
1565          * In memory it'll be like this:
1566          *
1567          * +-------------------------+
1568          * | struct wiphy           |
1569          * +-------------------------+
1570          * | struct ieee80211_local  |
1571          * +-------------------------+
1572          * | driver's private data   |
1573          * +-------------------------+
1574          *
1575          */
1576         priv_size = ((sizeof(struct ieee80211_local) +
1577                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
1578                     priv_data_len;
1579
1580         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
1581
1582         if (!wiphy)
1583                 return NULL;
1584
1585         wiphy->privid = mac80211_wiphy_privid;
1586
1587         local = wiphy_priv(wiphy);
1588         local->hw.wiphy = wiphy;
1589
1590         local->hw.priv = (char *)local +
1591                          ((sizeof(struct ieee80211_local) +
1592                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
1593
1594         BUG_ON(!ops->tx);
1595         BUG_ON(!ops->start);
1596         BUG_ON(!ops->stop);
1597         BUG_ON(!ops->config);
1598         BUG_ON(!ops->add_interface);
1599         BUG_ON(!ops->remove_interface);
1600         BUG_ON(!ops->configure_filter);
1601         local->ops = ops;
1602
1603         local->hw.queues = 1; /* default */
1604
1605         local->bridge_packets = 1;
1606
1607         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
1608         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1609         local->short_retry_limit = 7;
1610         local->long_retry_limit = 4;
1611         local->hw.conf.radio_enabled = 1;
1612
1613         INIT_LIST_HEAD(&local->interfaces);
1614
1615         spin_lock_init(&local->key_lock);
1616
1617         INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1618
1619         sta_info_init(local);
1620
1621         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1622                      (unsigned long)local);
1623         tasklet_disable(&local->tx_pending_tasklet);
1624
1625         tasklet_init(&local->tasklet,
1626                      ieee80211_tasklet_handler,
1627                      (unsigned long) local);
1628         tasklet_disable(&local->tasklet);
1629
1630         skb_queue_head_init(&local->skb_queue);
1631         skb_queue_head_init(&local->skb_queue_unreliable);
1632
1633         return local_to_hw(local);
1634 }
1635 EXPORT_SYMBOL(ieee80211_alloc_hw);
1636
1637 int ieee80211_register_hw(struct ieee80211_hw *hw)
1638 {
1639         struct ieee80211_local *local = hw_to_local(hw);
1640         const char *name;
1641         int result;
1642         enum ieee80211_band band;
1643         struct net_device *mdev;
1644         struct wireless_dev *mwdev;
1645
1646         /*
1647          * generic code guarantees at least one band,
1648          * set this very early because much code assumes
1649          * that hw.conf.channel is assigned
1650          */
1651         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1652                 struct ieee80211_supported_band *sband;
1653
1654                 sband = local->hw.wiphy->bands[band];
1655                 if (sband) {
1656                         /* init channel we're on */
1657                         local->hw.conf.channel =
1658                         local->oper_channel =
1659                         local->scan_channel = &sband->channels[0];
1660                         break;
1661                 }
1662         }
1663
1664         result = wiphy_register(local->hw.wiphy);
1665         if (result < 0)
1666                 return result;
1667
1668         /*
1669          * We use the number of queues for feature tests (QoS, HT) internally
1670          * so restrict them appropriately.
1671          */
1672 #ifdef CONFIG_MAC80211_QOS
1673         if (hw->queues > IEEE80211_MAX_QUEUES)
1674                 hw->queues = IEEE80211_MAX_QUEUES;
1675         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
1676                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
1677         if (hw->queues < 4)
1678                 hw->ampdu_queues = 0;
1679 #else
1680         hw->queues = 1;
1681         hw->ampdu_queues = 0;
1682 #endif
1683
1684         mdev = alloc_netdev_mq(sizeof(struct wireless_dev),
1685                                "wmaster%d", ether_setup,
1686                                ieee80211_num_queues(hw));
1687         if (!mdev)
1688                 goto fail_mdev_alloc;
1689
1690         if (ieee80211_num_queues(hw) > 1)
1691                 mdev->features |= NETIF_F_MULTI_QUEUE;
1692
1693         mwdev = netdev_priv(mdev);
1694         mdev->ieee80211_ptr = mwdev;
1695         mwdev->wiphy = local->hw.wiphy;
1696
1697         local->mdev = mdev;
1698
1699         ieee80211_rx_bss_list_init(local);
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         name = wiphy_dev(local->hw.wiphy)->driver->name;
1709         local->hw.workqueue = create_freezeable_workqueue(name);
1710         if (!local->hw.workqueue) {
1711                 result = -ENOMEM;
1712                 goto fail_workqueue;
1713         }
1714
1715         /*
1716          * The hardware needs headroom for sending the frame,
1717          * and we need some headroom for passing the frame to monitor
1718          * interfaces, but never both at the same time.
1719          */
1720         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1721                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
1722
1723         debugfs_hw_add(local);
1724
1725         if (local->hw.conf.beacon_int < 10)
1726                 local->hw.conf.beacon_int = 100;
1727
1728         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
1729                                                   IEEE80211_HW_SIGNAL_DB |
1730                                                   IEEE80211_HW_SIGNAL_DBM) ?
1731                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1732         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
1733                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1734         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
1735                 local->wstats_flags |= IW_QUAL_DBM;
1736
1737         result = sta_info_start(local);
1738         if (result < 0)
1739                 goto fail_sta_info;
1740
1741         rtnl_lock();
1742         result = dev_alloc_name(local->mdev, local->mdev->name);
1743         if (result < 0)
1744                 goto fail_dev;
1745
1746         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1747         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1748
1749         result = register_netdevice(local->mdev);
1750         if (result < 0)
1751                 goto fail_dev;
1752
1753         result = ieee80211_init_rate_ctrl_alg(local,
1754                                               hw->rate_control_algorithm);
1755         if (result < 0) {
1756                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1757                        "algorithm\n", wiphy_name(local->hw.wiphy));
1758                 goto fail_rate;
1759         }
1760
1761         result = ieee80211_wep_init(local);
1762
1763         if (result < 0) {
1764                 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1765                        wiphy_name(local->hw.wiphy));
1766                 goto fail_wep;
1767         }
1768
1769         ieee80211_install_qdisc(local->mdev);
1770
1771         /* add one default STA interface */
1772         result = ieee80211_if_add(local, "wlan%d", NULL,
1773                                   IEEE80211_IF_TYPE_STA, NULL);
1774         if (result)
1775                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1776                        wiphy_name(local->hw.wiphy));
1777
1778         rtnl_unlock();
1779
1780         ieee80211_led_init(local);
1781
1782         return 0;
1783
1784 fail_wep:
1785         rate_control_deinitialize(local);
1786 fail_rate:
1787         unregister_netdevice(local->mdev);
1788         local->mdev = NULL;
1789 fail_dev:
1790         rtnl_unlock();
1791         sta_info_stop(local);
1792 fail_sta_info:
1793         debugfs_hw_del(local);
1794         destroy_workqueue(local->hw.workqueue);
1795 fail_workqueue:
1796         if (local->mdev)
1797                 free_netdev(local->mdev);
1798 fail_mdev_alloc:
1799         wiphy_unregister(local->hw.wiphy);
1800         return result;
1801 }
1802 EXPORT_SYMBOL(ieee80211_register_hw);
1803
1804 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1805 {
1806         struct ieee80211_local *local = hw_to_local(hw);
1807
1808         tasklet_kill(&local->tx_pending_tasklet);
1809         tasklet_kill(&local->tasklet);
1810
1811         rtnl_lock();
1812
1813         /*
1814          * At this point, interface list manipulations are fine
1815          * because the driver cannot be handing us frames any
1816          * more and the tasklet is killed.
1817          */
1818
1819         /* First, we remove all virtual interfaces. */
1820         ieee80211_remove_interfaces(local);
1821
1822         /* then, finally, remove the master interface */
1823         unregister_netdevice(local->mdev);
1824
1825         rtnl_unlock();
1826
1827         ieee80211_rx_bss_list_deinit(local);
1828         ieee80211_clear_tx_pending(local);
1829         sta_info_stop(local);
1830         rate_control_deinitialize(local);
1831         debugfs_hw_del(local);
1832
1833         if (skb_queue_len(&local->skb_queue)
1834                         || skb_queue_len(&local->skb_queue_unreliable))
1835                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1836                        wiphy_name(local->hw.wiphy));
1837         skb_queue_purge(&local->skb_queue);
1838         skb_queue_purge(&local->skb_queue_unreliable);
1839
1840         destroy_workqueue(local->hw.workqueue);
1841         wiphy_unregister(local->hw.wiphy);
1842         ieee80211_wep_free(local);
1843         ieee80211_led_exit(local);
1844         free_netdev(local->mdev);
1845 }
1846 EXPORT_SYMBOL(ieee80211_unregister_hw);
1847
1848 void ieee80211_free_hw(struct ieee80211_hw *hw)
1849 {
1850         struct ieee80211_local *local = hw_to_local(hw);
1851
1852         wiphy_free(local->hw.wiphy);
1853 }
1854 EXPORT_SYMBOL(ieee80211_free_hw);
1855
1856 static int __init ieee80211_init(void)
1857 {
1858         struct sk_buff *skb;
1859         int ret;
1860
1861         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1862         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1863                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1864
1865         ret = rc80211_pid_init();
1866         if (ret)
1867                 goto out;
1868
1869         ret = ieee80211_wme_register();
1870         if (ret) {
1871                 printk(KERN_DEBUG "ieee80211_init: failed to "
1872                        "initialize WME (err=%d)\n", ret);
1873                 goto out_cleanup_pid;
1874         }
1875
1876         ieee80211_debugfs_netdev_init();
1877
1878         return 0;
1879
1880  out_cleanup_pid:
1881         rc80211_pid_exit();
1882  out:
1883         return ret;
1884 }
1885
1886 static void __exit ieee80211_exit(void)
1887 {
1888         rc80211_pid_exit();
1889
1890         /*
1891          * For key todo, it'll be empty by now but the work
1892          * might still be scheduled.
1893          */
1894         flush_scheduled_work();
1895
1896         if (mesh_allocated)
1897                 ieee80211s_stop();
1898
1899         ieee80211_wme_unregister();
1900         ieee80211_debugfs_netdev_exit();
1901 }
1902
1903
1904 subsys_initcall(ieee80211_init);
1905 module_exit(ieee80211_exit);
1906
1907 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1908 MODULE_LICENSE("GPL");