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_tx_start_all_queues(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         u8 null_addr[ETH_ALEN] = {0};
 191
 192         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 193
 194         /* fail early if user set an invalid address */
 195         if (compare_ether_addr(dev->dev_addr, null_addr) &&
 196             !is_valid_ether_addr(dev->dev_addr))
 197                 return -EADDRNOTAVAIL;
 198
 199         /* we hold the RTNL here so can safely walk the list */
 200         list_for_each_entry(nsdata, &local->interfaces, list) {
 201                 struct net_device *ndev = nsdata->dev;
 202
 203                 if (ndev != dev && netif_running(ndev)) {
 204                         /*
 205                          * Allow only a single IBSS interface to be up at any
 206                          * time. This is restricted because beacon distribution
 207                          * cannot work properly if both are in the same IBSS.
 208                          *
 209                          * To remove this restriction we'd have to disallow them
 210                          * from setting the same SSID on different IBSS interfaces
 211                          * belonging to the same hardware. Then, however, we're
 212                          * faced with having to adopt two different TSF timers...
 213                          */
 214                         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
 215                             nsdata->vif.type == IEEE80211_IF_TYPE_IBSS)
 216                                 return -EBUSY;
 217
 218                         /*
 219                          * The remaining checks are only performed for interfaces
 220                          * with the same MAC address.
 221                          */
 222                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 223                                 continue;
 224
 225                         /*
 226                          * check whether it may have the same address
 227                          */
 228                         if (!identical_mac_addr_allowed(sdata->vif.type,
 229                                                         nsdata->vif.type))
 230                                 return -ENOTUNIQ;
 231
 232                         /*
 233                          * can only add VLANs to enabled APs
 234                          */
 235                         if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN &&
 236                             nsdata->vif.type == IEEE80211_IF_TYPE_AP)
 237                                 sdata->bss = &nsdata->u.ap;
 238                 }
 239         }
 240
 241         switch (sdata->vif.type) {
 242         case IEEE80211_IF_TYPE_WDS:
 243                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 244                         return -ENOLINK;
 245                 break;
 246         case IEEE80211_IF_TYPE_VLAN:
 247                 if (!sdata->bss)
 248                         return -ENOLINK;
 249                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 250                 break;
 251         case IEEE80211_IF_TYPE_AP:
 252                 sdata->bss = &sdata->u.ap;
 253                 break;
 254         case IEEE80211_IF_TYPE_MESH_POINT:
 255                 /* mesh ifaces must set allmulti to forward mcast traffic */
 256                 atomic_inc(&local->iff_allmultis);
 257                 break;
 258         case IEEE80211_IF_TYPE_STA:
 259         case IEEE80211_IF_TYPE_MNTR:
 260         case IEEE80211_IF_TYPE_IBSS:
 261                 /* no special treatment */
 262                 break;
 263         case IEEE80211_IF_TYPE_INVALID:
 264                 /* cannot happen */
 265                 WARN_ON(1);
 266                 break;
 267         }
 268
 269         if (local->open_count == 0) {
 270                 res = 0;
 271                 if (local->ops->start)
 272                         res = local->ops->start(local_to_hw(local));
 273                 if (res)
 274                         goto err_del_bss;
 275                 need_hw_reconfig = 1;
 276                 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
 277         }
 278
 279         /*
 280          * Check all interfaces and copy the hopefully now-present
 281          * MAC address to those that have the special null one.
 282          */
 283         list_for_each_entry(nsdata, &local->interfaces, list) {
 284                 struct net_device *ndev = nsdata->dev;
 285
 286                 /*
 287                  * No need to check netif_running since we do not allow
 288                  * it to start up with this invalid address.
 289                  */
 290                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
 291                         memcpy(ndev->dev_addr,
 292                                local->hw.wiphy->perm_addr,
 293                                ETH_ALEN);
 294         }
 295
 296         if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0)
 297                 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr,
 298                        ETH_ALEN);
 299
 300         /*
 301          * Validate the MAC address for this device.
 302          */
 303         if (!is_valid_ether_addr(dev->dev_addr)) {
 304                 if (!local->open_count && local->ops->stop)
 305                         local->ops->stop(local_to_hw(local));
 306                 return -EADDRNOTAVAIL;
 307         }
 308
 309         switch (sdata->vif.type) {
 310         case IEEE80211_IF_TYPE_VLAN:
 311                 /* no need to tell driver */
 312                 break;
 313         case IEEE80211_IF_TYPE_MNTR:
 314                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 315                         local->cooked_mntrs++;
 316                         break;
 317                 }
 318
 319                 /* must be before the call to ieee80211_configure_filter */
 320                 local->monitors++;
 321                 if (local->monitors == 1)
 322                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 323
 324                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 325                         local->fif_fcsfail++;
 326                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 327                         local->fif_plcpfail++;
 328                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 329                         local->fif_control++;
 330                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 331                         local->fif_other_bss++;
 332
 333                 netif_addr_lock_bh(local->mdev);
 334                 ieee80211_configure_filter(local);
 335                 netif_addr_unlock_bh(local->mdev);
 336                 break;
 337         case IEEE80211_IF_TYPE_STA:
 338         case IEEE80211_IF_TYPE_IBSS:
 339                 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
 340                 /* fall through */
 341         default:
 342                 conf.vif = &sdata->vif;
 343                 conf.type = sdata->vif.type;
 344                 conf.mac_addr = dev->dev_addr;
 345                 res = local->ops->add_interface(local_to_hw(local), &conf);
 346                 if (res)
 347                         goto err_stop;
 348
 349                 if (ieee80211_vif_is_mesh(&sdata->vif))
 350                         ieee80211_start_mesh(sdata);
 351                 changed |= ieee80211_reset_erp_info(sdata);
 352                 ieee80211_bss_info_change_notify(sdata, changed);
 353                 ieee80211_enable_keys(sdata);
 354
 355                 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
 356                     !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
 357                         netif_carrier_off(dev);
 358                 else
 359                         netif_carrier_on(dev);
 360         }
 361
 362         if (sdata->vif.type == IEEE80211_IF_TYPE_WDS) {
 363                 /* Create STA entry for the WDS peer */
 364                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 365                                      GFP_KERNEL);
 366                 if (!sta) {
 367                         res = -ENOMEM;
 368                         goto err_del_interface;
 369                 }
 370
 371                 /* no locking required since STA is not live yet */
 372                 sta->flags |= WLAN_STA_AUTHORIZED;
 373
 374                 res = sta_info_insert(sta);
 375                 if (res) {
 376                         /* STA has been freed */
 377                         goto err_del_interface;
 378                 }
 379         }
 380
 381         if (local->open_count == 0) {
 382                 res = dev_open(local->mdev);
 383                 WARN_ON(res);
 384                 if (res)
 385                         goto err_del_interface;
 386                 tasklet_enable(&local->tx_pending_tasklet);
 387                 tasklet_enable(&local->tasklet);
 388         }
 389
 390         /*
 391          * set_multicast_list will be invoked by the networking core
 392          * which will check whether any increments here were done in
 393          * error and sync them down to the hardware as filter flags.
 394          */
 395         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 396                 atomic_inc(&local->iff_allmultis);
 397
 398         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 399                 atomic_inc(&local->iff_promiscs);
 400
 401         local->open_count++;
 402         if (need_hw_reconfig)
 403                 ieee80211_hw_config(local);
 404
 405         /*
 406          * ieee80211_sta_work is disabled while network interface
 407          * is down. Therefore, some configuration changes may not
 408          * yet be effective. Trigger execution of ieee80211_sta_work
 409          * to fix this.
 410          */
 411         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
 412             sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
 413                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 414                 queue_work(local->hw.workqueue, &ifsta->work);
 415         }
 416
 417         netif_tx_start_all_queues(dev);
 418
 419         return 0;
 420  err_del_interface:
 421         local->ops->remove_interface(local_to_hw(local), &conf);
 422  err_stop:
 423         if (!local->open_count && local->ops->stop)
 424                 local->ops->stop(local_to_hw(local));
 425  err_del_bss:
 426         sdata->bss = NULL;
 427         if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN)
 428                 list_del(&sdata->u.vlan.list);
 429         return res;
 430 }
 431
 432 static int ieee80211_stop(struct net_device *dev)
 433 {
 434         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 435         struct ieee80211_local *local = sdata->local;
 436         struct ieee80211_if_init_conf conf;
 437         struct sta_info *sta;
 438
 439         /*
 440          * Stop TX on this interface first.
 441          */
 442         netif_tx_stop_all_queues(dev);
 443
 444         /*
 445          * Now delete all active aggregation sessions.
 446          */
 447         rcu_read_lock();
 448
 449         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 450                 if (sta->sdata == sdata)
 451                         ieee80211_sta_tear_down_BA_sessions(sdata, sta->addr);
 452         }
 453
 454         rcu_read_unlock();
 455
 456         /*
 457          * Remove all stations associated with this interface.
 458          *
 459          * This must be done before calling ops->remove_interface()
 460          * because otherwise we can later invoke ops->sta_notify()
 461          * whenever the STAs are removed, and that invalidates driver
 462          * assumptions about always getting a vif pointer that is valid
 463          * (because if we remove a STA after ops->remove_interface()
 464          * the driver will have removed the vif info already!)
 465          *
 466          * We could relax this and only unlink the stations from the
 467          * hash table and list but keep them on a per-sdata list that
 468          * will be inserted back again when the interface is brought
 469          * up again, but I don't currently see a use case for that,
 470          * except with WDS which gets a STA entry created when it is
 471          * brought up.
 472          */
 473         sta_info_flush(local, sdata);
 474
 475         /*
 476          * Don't count this interface for promisc/allmulti while it
 477          * is down. dev_mc_unsync() will invoke set_multicast_list
 478          * on the master interface which will sync these down to the
 479          * hardware as filter flags.
 480          */
 481         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 482                 atomic_dec(&local->iff_allmultis);
 483
 484         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 485                 atomic_dec(&local->iff_promiscs);
 486
 487         dev_mc_unsync(local->mdev, dev);
 488
 489         /* APs need special treatment */
 490         if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
 491                 struct ieee80211_sub_if_data *vlan, *tmp;
 492                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 493
 494                 /* remove beacon */
 495                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 496                 synchronize_rcu();
 497                 kfree(old_beacon);
 498
 499                 /* down all dependent devices, that is VLANs */
 500                 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
 501                                          u.vlan.list)
 502                         dev_close(vlan->dev);
 503                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 504         }
 505
 506         local->open_count--;
 507
 508         switch (sdata->vif.type) {
 509         case IEEE80211_IF_TYPE_VLAN:
 510                 list_del(&sdata->u.vlan.list);
 511                 /* no need to tell driver */
 512                 break;
 513         case IEEE80211_IF_TYPE_MNTR:
 514                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 515                         local->cooked_mntrs--;
 516                         break;
 517                 }
 518
 519                 local->monitors--;
 520                 if (local->monitors == 0)
 521                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
 522
 523                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 524                         local->fif_fcsfail--;
 525                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 526                         local->fif_plcpfail--;
 527                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 528                         local->fif_control--;
 529                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 530                         local->fif_other_bss--;
 531
 532                 netif_addr_lock_bh(local->mdev);
 533                 ieee80211_configure_filter(local);
 534                 netif_addr_unlock_bh(local->mdev);
 535                 break;
 536         case IEEE80211_IF_TYPE_MESH_POINT:
 537                 /* allmulti is always set on mesh ifaces */
 538                 atomic_dec(&local->iff_allmultis);
 539                 /* fall through */
 540         case IEEE80211_IF_TYPE_STA:
 541         case IEEE80211_IF_TYPE_IBSS:
 542                 sdata->u.sta.state = IEEE80211_DISABLED;
 543                 memset(sdata->u.sta.bssid, 0, ETH_ALEN);
 544                 del_timer_sync(&sdata->u.sta.timer);
 545                 /*
 546                  * When we get here, the interface is marked down.
 547                  * Call synchronize_rcu() to wait for the RX path
 548                  * should it be using the interface and enqueuing
 549                  * frames at this very time on another CPU.
 550                  */
 551                 synchronize_rcu();
 552                 skb_queue_purge(&sdata->u.sta.skb_queue);
 553
 554                 if (local->scan_dev == sdata->dev) {
 555                         if (!local->ops->hw_scan) {
 556                                 local->sta_sw_scanning = 0;
 557                                 cancel_delayed_work(&local->scan_work);
 558                         } else
 559                                 local->sta_hw_scanning = 0;
 560                 }
 561
 562                 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
 563                 kfree(sdata->u.sta.extra_ie);
 564                 sdata->u.sta.extra_ie = NULL;
 565                 sdata->u.sta.extra_ie_len = 0;
 566                 /* fall through */
 567         default:
 568                 conf.vif = &sdata->vif;
 569                 conf.type = sdata->vif.type;
 570                 conf.mac_addr = dev->dev_addr;
 571                 /* disable all keys for as long as this netdev is down */
 572                 ieee80211_disable_keys(sdata);
 573                 local->ops->remove_interface(local_to_hw(local), &conf);
 574         }
 575
 576         sdata->bss = NULL;
 577
 578         if (local->open_count == 0) {
 579                 if (netif_running(local->mdev))
 580                         dev_close(local->mdev);
 581
 582                 if (local->ops->stop)
 583                         local->ops->stop(local_to_hw(local));
 584
 585                 ieee80211_led_radio(local, 0);
 586
 587                 flush_workqueue(local->hw.workqueue);
 588
 589                 tasklet_disable(&local->tx_pending_tasklet);
 590                 tasklet_disable(&local->tasklet);
 591         }
 592
 593         return 0;
 594 }
 595
 596 int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid)
 597 {
 598         struct ieee80211_local *local = hw_to_local(hw);
 599         struct sta_info *sta;
 600         struct ieee80211_sub_if_data *sdata;
 601         u16 start_seq_num = 0;
 602         u8 *state;
 603         int ret;
 604         DECLARE_MAC_BUF(mac);
 605
 606         if (tid >= STA_TID_NUM)
 607                 return -EINVAL;
 608
 609 #ifdef CONFIG_MAC80211_HT_DEBUG
 610         printk(KERN_DEBUG "Open BA session requested for %s tid %u\n",
 611                                 print_mac(mac, ra), tid);
 612 #endif /* CONFIG_MAC80211_HT_DEBUG */
 613
 614         rcu_read_lock();
 615
 616         sta = sta_info_get(local, ra);
 617         if (!sta) {
 618 #ifdef CONFIG_MAC80211_HT_DEBUG
 619                 printk(KERN_DEBUG "Could not find the station\n");
 620 #endif
 621                 ret = -ENOENT;
 622                 goto exit;
 623         }
 624
 625         spin_lock_bh(&sta->lock);
 626
 627         /* we have tried too many times, receiver does not want A-MPDU */
 628         if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
 629                 ret = -EBUSY;
 630                 goto err_unlock_sta;
 631         }
 632
 633         state = &sta->ampdu_mlme.tid_state_tx[tid];
 634         /* check if the TID is not in aggregation flow already */
 635         if (*state != HT_AGG_STATE_IDLE) {
 636 #ifdef CONFIG_MAC80211_HT_DEBUG
 637                 printk(KERN_DEBUG "BA request denied - session is not "
 638                                  "idle on tid %u\n", tid);
 639 #endif /* CONFIG_MAC80211_HT_DEBUG */
 640                 ret = -EAGAIN;
 641                 goto err_unlock_sta;
 642         }
 643
 644         /* prepare A-MPDU MLME for Tx aggregation */
 645         sta->ampdu_mlme.tid_tx[tid] =
 646                         kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
 647         if (!sta->ampdu_mlme.tid_tx[tid]) {
 648 #ifdef CONFIG_MAC80211_HT_DEBUG
 649                 if (net_ratelimit())
 650                         printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
 651                                         tid);
 652 #endif
 653                 ret = -ENOMEM;
 654                 goto err_unlock_sta;
 655         }
 656         /* Tx timer */
 657         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function =
 658                         sta_addba_resp_timer_expired;
 659         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data =
 660                         (unsigned long)&sta->timer_to_tid[tid];
 661         init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
 662
 663         /* create a new queue for this aggregation */
 664         ret = ieee80211_ht_agg_queue_add(local, sta, tid);
 665
 666         /* case no queue is available to aggregation
 667          * don't switch to aggregation */
 668         if (ret) {
 669 #ifdef CONFIG_MAC80211_HT_DEBUG
 670                 printk(KERN_DEBUG "BA request denied - queue unavailable for"
 671                                         " tid %d\n", tid);
 672 #endif /* CONFIG_MAC80211_HT_DEBUG */
 673                 goto err_unlock_queue;
 674         }
 675         sdata = sta->sdata;
 676
 677         /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
 678          * call back right away, it must see that the flow has begun */
 679         *state |= HT_ADDBA_REQUESTED_MSK;
 680
 681         if (local->ops->ampdu_action)
 682                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
 683                                                 ra, tid, &start_seq_num);
 684
 685         if (ret) {
 686                 /* No need to requeue the packets in the agg queue, since we
 687                  * held the tx lock: no packet could be enqueued to the newly
 688                  * allocated queue */
 689                 ieee80211_ht_agg_queue_remove(local, sta, tid, 0);
 690 #ifdef CONFIG_MAC80211_HT_DEBUG
 691                 printk(KERN_DEBUG "BA request denied - HW unavailable for"
 692                                         " tid %d\n", tid);
 693 #endif /* CONFIG_MAC80211_HT_DEBUG */
 694                 *state = HT_AGG_STATE_IDLE;
 695                 goto err_unlock_queue;
 696         }
 697
 698         /* Will put all the packets in the new SW queue */
 699         ieee80211_requeue(local, ieee802_1d_to_ac[tid]);
 700         spin_unlock_bh(&sta->lock);
 701
 702         /* send an addBA request */
 703         sta->ampdu_mlme.dialog_token_allocator++;
 704         sta->ampdu_mlme.tid_tx[tid]->dialog_token =
 705                         sta->ampdu_mlme.dialog_token_allocator;
 706         sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
 707
 708
 709         ieee80211_send_addba_request(sta->sdata, ra, tid,
 710                          sta->ampdu_mlme.tid_tx[tid]->dialog_token,
 711                          sta->ampdu_mlme.tid_tx[tid]->ssn,
 712                          0x40, 5000);
 713         /* activate the timer for the recipient's addBA response */
 714         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
 715                                 jiffies + ADDBA_RESP_INTERVAL;
 716         add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
 717 #ifdef CONFIG_MAC80211_HT_DEBUG
 718         printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
 719 #endif
 720         goto exit;
 721
 722 err_unlock_queue:
 723         kfree(sta->ampdu_mlme.tid_tx[tid]);
 724         sta->ampdu_mlme.tid_tx[tid] = NULL;
 725         ret = -EBUSY;
 726 err_unlock_sta:
 727         spin_unlock_bh(&sta->lock);
 728 exit:
 729         rcu_read_unlock();
 730         return ret;
 731 }
 732 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
 733
 734 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
 735                                  u8 *ra, u16 tid,
 736                                  enum ieee80211_back_parties initiator)
 737 {
 738         struct ieee80211_local *local = hw_to_local(hw);
 739         struct sta_info *sta;
 740         u8 *state;
 741         int ret = 0;
 742         DECLARE_MAC_BUF(mac);
 743
 744         if (tid >= STA_TID_NUM)
 745                 return -EINVAL;
 746
 747         rcu_read_lock();
 748         sta = sta_info_get(local, ra);
 749         if (!sta) {
 750                 rcu_read_unlock();
 751                 return -ENOENT;
 752         }
 753
 754         /* check if the TID is in aggregation */
 755         state = &sta->ampdu_mlme.tid_state_tx[tid];
 756         spin_lock_bh(&sta->lock);
 757
 758         if (*state != HT_AGG_STATE_OPERATIONAL) {
 759                 ret = -ENOENT;
 760                 goto stop_BA_exit;
 761         }
 762
 763 #ifdef CONFIG_MAC80211_HT_DEBUG
 764         printk(KERN_DEBUG "Tx BA session stop requested for %s tid %u\n",
 765                                 print_mac(mac, ra), tid);
 766 #endif /* CONFIG_MAC80211_HT_DEBUG */
 767
 768         ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]);
 769
 770         *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
 771                 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
 772
 773         if (local->ops->ampdu_action)
 774                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP,
 775                                                 ra, tid, NULL);
 776
 777         /* case HW denied going back to legacy */
 778         if (ret) {
 779                 WARN_ON(ret != -EBUSY);
 780                 *state = HT_AGG_STATE_OPERATIONAL;
 781                 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
 782                 goto stop_BA_exit;
 783         }
 784
 785 stop_BA_exit:
 786         spin_unlock_bh(&sta->lock);
 787         rcu_read_unlock();
 788         return ret;
 789 }
 790 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
 791
 792 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
 793 {
 794         struct ieee80211_local *local = hw_to_local(hw);
 795         struct sta_info *sta;
 796         u8 *state;
 797         DECLARE_MAC_BUF(mac);
 798
 799         if (tid >= STA_TID_NUM) {
 800 #ifdef CONFIG_MAC80211_HT_DEBUG
 801                 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
 802                                 tid, STA_TID_NUM);
 803 #endif
 804                 return;
 805         }
 806
 807         rcu_read_lock();
 808         sta = sta_info_get(local, ra);
 809         if (!sta) {
 810                 rcu_read_unlock();
 811 #ifdef CONFIG_MAC80211_HT_DEBUG
 812                 printk(KERN_DEBUG "Could not find station: %s\n",
 813                                 print_mac(mac, ra));
 814 #endif
 815                 return;
 816         }
 817
 818         state = &sta->ampdu_mlme.tid_state_tx[tid];
 819         spin_lock_bh(&sta->lock);
 820
 821         if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
 822 #ifdef CONFIG_MAC80211_HT_DEBUG
 823                 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
 824                                 *state);
 825 #endif
 826                 spin_unlock_bh(&sta->lock);
 827                 rcu_read_unlock();
 828                 return;
 829         }
 830
 831         WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK);
 832
 833         *state |= HT_ADDBA_DRV_READY_MSK;
 834
 835         if (*state == HT_AGG_STATE_OPERATIONAL) {
 836 #ifdef CONFIG_MAC80211_HT_DEBUG
 837                 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
 838 #endif
 839                 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
 840         }
 841         spin_unlock_bh(&sta->lock);
 842         rcu_read_unlock();
 843 }
 844 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
 845
 846 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
 847 {
 848         struct ieee80211_local *local = hw_to_local(hw);
 849         struct sta_info *sta;
 850         u8 *state;
 851         int agg_queue;
 852         DECLARE_MAC_BUF(mac);
 853
 854         if (tid >= STA_TID_NUM) {
 855 #ifdef CONFIG_MAC80211_HT_DEBUG
 856                 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
 857                                 tid, STA_TID_NUM);
 858 #endif
 859                 return;
 860         }
 861
 862 #ifdef CONFIG_MAC80211_HT_DEBUG
 863         printk(KERN_DEBUG "Stopping Tx BA session for %s tid %d\n",
 864                                 print_mac(mac, ra), tid);
 865 #endif /* CONFIG_MAC80211_HT_DEBUG */
 866
 867         rcu_read_lock();
 868         sta = sta_info_get(local, ra);
 869         if (!sta) {
 870 #ifdef CONFIG_MAC80211_HT_DEBUG
 871                 printk(KERN_DEBUG "Could not find station: %s\n",
 872                                 print_mac(mac, ra));
 873 #endif
 874                 rcu_read_unlock();
 875                 return;
 876         }
 877         state = &sta->ampdu_mlme.tid_state_tx[tid];
 878
 879         /* NOTE: no need to use sta->lock in this state check, as
 880          * ieee80211_stop_tx_ba_session will let only one stop call to
 881          * pass through per sta/tid
 882          */
 883         if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
 884 #ifdef CONFIG_MAC80211_HT_DEBUG
 885                 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
 886 #endif
 887                 rcu_read_unlock();
 888                 return;
 889         }
 890
 891         if (*state & HT_AGG_STATE_INITIATOR_MSK)
 892                 ieee80211_send_delba(sta->sdata, ra, tid,
 893                         WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
 894
 895         agg_queue = sta->tid_to_tx_q[tid];
 896
 897         ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
 898
 899         /* We just requeued the all the frames that were in the
 900          * removed queue, and since we might miss a softirq we do
 901          * netif_schedule_queue.  ieee80211_wake_queue is not used
 902          * here as this queue is not necessarily stopped
 903          */
 904         netif_schedule_queue(netdev_get_tx_queue(local->mdev, agg_queue));
 905         spin_lock_bh(&sta->lock);
 906         *state = HT_AGG_STATE_IDLE;
 907         sta->ampdu_mlme.addba_req_num[tid] = 0;
 908         kfree(sta->ampdu_mlme.tid_tx[tid]);
 909         sta->ampdu_mlme.tid_tx[tid] = NULL;
 910         spin_unlock_bh(&sta->lock);
 911
 912         rcu_read_unlock();
 913 }
 914 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
 915
 916 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
 917                                       const u8 *ra, u16 tid)
 918 {
 919         struct ieee80211_local *local = hw_to_local(hw);
 920         struct ieee80211_ra_tid *ra_tid;
 921         struct sk_buff *skb = dev_alloc_skb(0);
 922
 923         if (unlikely(!skb)) {
 924 #ifdef CONFIG_MAC80211_HT_DEBUG
 925                 if (net_ratelimit())
 926                         printk(KERN_WARNING "%s: Not enough memory, "
 927                                "dropping start BA session", skb->dev->name);
 928 #endif
 929                 return;
 930         }
 931         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 932         memcpy(&ra_tid->ra, ra, ETH_ALEN);
 933         ra_tid->tid = tid;
 934
 935         skb->pkt_type = IEEE80211_ADDBA_MSG;
 936         skb_queue_tail(&local->skb_queue, skb);
 937         tasklet_schedule(&local->tasklet);
 938 }
 939 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
 940
 941 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
 942                                      const u8 *ra, u16 tid)
 943 {
 944         struct ieee80211_local *local = hw_to_local(hw);
 945         struct ieee80211_ra_tid *ra_tid;
 946         struct sk_buff *skb = dev_alloc_skb(0);
 947
 948         if (unlikely(!skb)) {
 949 #ifdef CONFIG_MAC80211_HT_DEBUG
 950                 if (net_ratelimit())
 951                         printk(KERN_WARNING "%s: Not enough memory, "
 952                                "dropping stop BA session", skb->dev->name);
 953 #endif
 954                 return;
 955         }
 956         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 957         memcpy(&ra_tid->ra, ra, ETH_ALEN);
 958         ra_tid->tid = tid;
 959
 960         skb->pkt_type = IEEE80211_DELBA_MSG;
 961         skb_queue_tail(&local->skb_queue, skb);
 962         tasklet_schedule(&local->tasklet);
 963 }
 964 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
 965
 966 static void ieee80211_set_multicast_list(struct net_device *dev)
 967 {
 968         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 969         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 970         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 971
 972         allmulti = !!(dev->flags & IFF_ALLMULTI);
 973         promisc = !!(dev->flags & IFF_PROMISC);
 974         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 975         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 976
 977         if (allmulti != sdata_allmulti) {
 978                 if (dev->flags & IFF_ALLMULTI)
 979                         atomic_inc(&local->iff_allmultis);
 980                 else
 981                         atomic_dec(&local->iff_allmultis);
 982                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 983         }
 984
 985         if (promisc != sdata_promisc) {
 986                 if (dev->flags & IFF_PROMISC)
 987                         atomic_inc(&local->iff_promiscs);
 988                 else
 989                         atomic_dec(&local->iff_promiscs);
 990                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 991         }
 992
 993         dev_mc_sync(local->mdev, dev);
 994 }
 995
 996 static const struct header_ops ieee80211_header_ops = {
 997         .create         = eth_header,
 998         .parse          = header_parse_80211,
 999         .rebuild        = eth_rebuild_header,
1000         .cache          = eth_header_cache,
1001         .cache_update   = eth_header_cache_update,
1002 };
1003
1004 void ieee80211_if_setup(struct net_device *dev)
1005 {
1006         ether_setup(dev);
1007         dev->hard_start_xmit = ieee80211_subif_start_xmit;
1008         dev->wireless_handlers = &ieee80211_iw_handler_def;
1009         dev->set_multicast_list = ieee80211_set_multicast_list;
1010         dev->change_mtu = ieee80211_change_mtu;
1011         dev->open = ieee80211_open;
1012         dev->stop = ieee80211_stop;
1013         dev->destructor = free_netdev;
1014         /* we will validate the address ourselves in ->open */
1015         dev->validate_addr = NULL;
1016 }
1017
1018 /* everything else */
1019
1020 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
1021 {
1022         struct ieee80211_local *local = sdata->local;
1023         struct ieee80211_if_conf conf;
1024
1025         if (WARN_ON(!netif_running(sdata->dev)))
1026                 return 0;
1027
1028         if (!local->ops->config_interface)
1029                 return 0;
1030
1031         memset(&conf, 0, sizeof(conf));
1032         conf.changed = changed;
1033
1034         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
1035             sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
1036                 conf.bssid = sdata->u.sta.bssid;
1037                 conf.ssid = sdata->u.sta.ssid;
1038                 conf.ssid_len = sdata->u.sta.ssid_len;
1039         } else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
1040                 conf.bssid = sdata->dev->dev_addr;
1041                 conf.ssid = sdata->u.ap.ssid;
1042                 conf.ssid_len = sdata->u.ap.ssid_len;
1043         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
1044                 u8 zero[ETH_ALEN] = { 0 };
1045                 conf.bssid = zero;
1046                 conf.ssid = zero;
1047                 conf.ssid_len = 0;
1048         } else {
1049                 WARN_ON(1);
1050                 return -EINVAL;
1051         }
1052
1053         if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
1054                 return -EINVAL;
1055
1056         if (WARN_ON(!conf.ssid && (changed & IEEE80211_IFCC_SSID)))
1057                 return -EINVAL;
1058
1059         return local->ops->config_interface(local_to_hw(local),
1060                                             &sdata->vif, &conf);
1061 }
1062
1063 int ieee80211_hw_config(struct ieee80211_local *local)
1064 {
1065         struct ieee80211_channel *chan;
1066         int ret = 0;
1067
1068         if (local->sta_sw_scanning)
1069                 chan = local->scan_channel;
1070         else
1071                 chan = local->oper_channel;
1072
1073         local->hw.conf.channel = chan;
1074
1075         if (!local->hw.conf.power_level)
1076                 local->hw.conf.power_level = chan->max_power;
1077         else
1078                 local->hw.conf.power_level = min(chan->max_power,
1079                                                local->hw.conf.power_level);
1080
1081         local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
1082
1083 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1084         printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
1085                wiphy_name(local->hw.wiphy), chan->center_freq);
1086 #endif
1087
1088         if (local->open_count)
1089                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
1090
1091         return ret;
1092 }
1093
1094 /**
1095  * ieee80211_handle_ht should be used only after legacy configuration
1096  * has been determined namely band, as ht configuration depends upon
1097  * the hardware's HT abilities for a _specific_ band.
1098  */
1099 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
1100                            struct ieee80211_ht_info *req_ht_cap,
1101                            struct ieee80211_ht_bss_info *req_bss_cap)
1102 {
1103         struct ieee80211_conf *conf = &local->hw.conf;
1104         struct ieee80211_supported_band *sband;
1105         struct ieee80211_ht_info ht_conf;
1106         struct ieee80211_ht_bss_info ht_bss_conf;
1107         u32 changed = 0;
1108         int i;
1109         u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS;
1110         u8 tx_mcs_set_cap;
1111
1112         sband = local->hw.wiphy->bands[conf->channel->band];
1113
1114         memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
1115         memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
1116
1117         /* HT is not supported */
1118         if (!sband->ht_info.ht_supported) {
1119                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1120                 goto out;
1121         }
1122
1123         /* disable HT */
1124         if (!enable_ht) {
1125                 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
1126                         changed |= BSS_CHANGED_HT;
1127                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1128                 conf->ht_conf.ht_supported = 0;
1129                 goto out;
1130         }
1131
1132
1133         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
1134                 changed |= BSS_CHANGED_HT;
1135
1136         conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
1137         ht_conf.ht_supported = 1;
1138
1139         ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
1140         ht_conf.cap &= ~(IEEE80211_HT_CAP_MIMO_PS);
1141         ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_MIMO_PS;
1142         ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
1143         ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
1144         ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
1145
1146         ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
1147         ht_conf.ampdu_density = req_ht_cap->ampdu_density;
1148
1149         /* Bits 96-100 */
1150         tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12];
1151
1152         /* configure suppoerted Tx MCS according to requested MCS
1153          * (based in most cases on Rx capabilities of peer) and self
1154          * Tx MCS capabilities (as defined by low level driver HW
1155          * Tx capabilities) */
1156         if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED))
1157                 goto check_changed;
1158
1159         /* Counting from 0 therfore + 1 */
1160         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF)
1161                 max_tx_streams = ((tx_mcs_set_cap &
1162                                 IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1;
1163
1164         for (i = 0; i < max_tx_streams; i++)
1165                 ht_conf.supp_mcs_set[i] =
1166                         sband->ht_info.supp_mcs_set[i] &
1167                                         req_ht_cap->supp_mcs_set[i];
1168
1169         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM)
1170                 for (i = IEEE80211_SUPP_MCS_SET_UEQM;
1171                      i < IEEE80211_SUPP_MCS_SET_LEN; i++)
1172                         ht_conf.supp_mcs_set[i] =
1173                                 sband->ht_info.supp_mcs_set[i] &
1174                                         req_ht_cap->supp_mcs_set[i];
1175
1176 check_changed:
1177         /* if bss configuration changed store the new one */
1178         if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
1179             memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
1180                 changed |= BSS_CHANGED_HT;
1181                 memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
1182                 memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
1183         }
1184 out:
1185         return changed;
1186 }
1187
1188 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1189                                       u32 changed)
1190 {
1191         struct ieee80211_local *local = sdata->local;
1192
1193         if (!changed)
1194                 return;
1195
1196         if (local->ops->bss_info_changed)
1197                 local->ops->bss_info_changed(local_to_hw(local),
1198                                              &sdata->vif,
1199                                              &sdata->bss_conf,
1200                                              changed);
1201 }
1202
1203 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
1204 {
1205         sdata->bss_conf.use_cts_prot = 0;
1206         sdata->bss_conf.use_short_preamble = 0;
1207         return BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE;
1208 }
1209
1210 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
1211                                  struct sk_buff *skb)
1212 {
1213         struct ieee80211_local *local = hw_to_local(hw);
1214         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1215         int tmp;
1216
1217         skb->dev = local->mdev;
1218         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
1219         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
1220                        &local->skb_queue : &local->skb_queue_unreliable, skb);
1221         tmp = skb_queue_len(&local->skb_queue) +
1222                 skb_queue_len(&local->skb_queue_unreliable);
1223         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
1224                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1225                 dev_kfree_skb_irq(skb);
1226                 tmp--;
1227                 I802_DEBUG_INC(local->tx_status_drop);
1228         }
1229         tasklet_schedule(&local->tasklet);
1230 }
1231 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
1232
1233 static void ieee80211_tasklet_handler(unsigned long data)
1234 {
1235         struct ieee80211_local *local = (struct ieee80211_local *) data;
1236         struct sk_buff *skb;
1237         struct ieee80211_rx_status rx_status;
1238         struct ieee80211_ra_tid *ra_tid;
1239
1240         while ((skb = skb_dequeue(&local->skb_queue)) ||
1241                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1242                 switch (skb->pkt_type) {
1243                 case IEEE80211_RX_MSG:
1244                         /* status is in skb->cb */
1245                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
1246                         /* Clear skb->pkt_type in order to not confuse kernel
1247                          * netstack. */
1248                         skb->pkt_type = 0;
1249                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
1250                         break;
1251                 case IEEE80211_TX_STATUS_MSG:
1252                         skb->pkt_type = 0;
1253                         ieee80211_tx_status(local_to_hw(local), skb);
1254                         break;
1255                 case IEEE80211_DELBA_MSG:
1256                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1257                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
1258                                                 ra_tid->ra, ra_tid->tid);
1259                         dev_kfree_skb(skb);
1260                         break;
1261                 case IEEE80211_ADDBA_MSG:
1262                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1263                         ieee80211_start_tx_ba_cb(local_to_hw(local),
1264                                                  ra_tid->ra, ra_tid->tid);
1265                         dev_kfree_skb(skb);
1266                         break ;
1267                 default:
1268                         WARN_ON(1);
1269                         dev_kfree_skb(skb);
1270                         break;
1271                 }
1272         }
1273 }
1274
1275 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
1276  * make a prepared TX frame (one that has been given to hw) to look like brand
1277  * new IEEE 802.11 frame that is ready to go through TX processing again.
1278  */
1279 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
1280                                       struct ieee80211_key *key,
1281                                       struct sk_buff *skb)
1282 {
1283         unsigned int hdrlen, iv_len, mic_len;
1284         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1285
1286         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1287
1288         if (!key)
1289                 goto no_key;
1290
1291         switch (key->conf.alg) {
1292         case ALG_WEP:
1293                 iv_len = WEP_IV_LEN;
1294                 mic_len = WEP_ICV_LEN;
1295                 break;
1296         case ALG_TKIP:
1297                 iv_len = TKIP_IV_LEN;
1298                 mic_len = TKIP_ICV_LEN;
1299                 break;
1300         case ALG_CCMP:
1301                 iv_len = CCMP_HDR_LEN;
1302                 mic_len = CCMP_MIC_LEN;
1303                 break;
1304         default:
1305                 goto no_key;
1306         }
1307
1308         if (skb->len >= hdrlen + mic_len &&
1309             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
1310                 skb_trim(skb, skb->len - mic_len);
1311         if (skb->len >= hdrlen + iv_len) {
1312                 memmove(skb->data + iv_len, skb->data, hdrlen);
1313                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
1314         }
1315
1316 no_key:
1317         if (ieee80211_is_data_qos(hdr->frame_control)) {
1318                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1319                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
1320                         hdrlen - IEEE80211_QOS_CTL_LEN);
1321                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
1322         }
1323 }
1324
1325 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
1326                                             struct sta_info *sta,
1327                                             struct sk_buff *skb)
1328 {
1329         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1330
1331         sta->tx_filtered_count++;
1332
1333         /*
1334          * Clear the TX filter mask for this STA when sending the next
1335          * packet. If the STA went to power save mode, this will happen
1336          * when it wakes up for the next time.
1337          */
1338         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
1339
1340         /*
1341          * This code races in the following way:
1342          *
1343          *  (1) STA sends frame indicating it will go to sleep and does so
1344          *  (2) hardware/firmware adds STA to filter list, passes frame up
1345          *  (3) hardware/firmware processes TX fifo and suppresses a frame
1346          *  (4) we get TX status before having processed the frame and
1347          *      knowing that the STA has gone to sleep.
1348          *
1349          * This is actually quite unlikely even when both those events are
1350          * processed from interrupts coming in quickly after one another or
1351          * even at the same time because we queue both TX status events and
1352          * RX frames to be processed by a tasklet and process them in the
1353          * same order that they were received or TX status last. Hence, there
1354          * is no race as long as the frame RX is processed before the next TX
1355          * status, which drivers can ensure, see below.
1356          *
1357          * Note that this can only happen if the hardware or firmware can
1358          * actually add STAs to the filter list, if this is done by the
1359          * driver in response to set_tim() (which will only reduce the race
1360          * this whole filtering tries to solve, not completely solve it)
1361          * this situation cannot happen.
1362          *
1363          * To completely solve this race drivers need to make sure that they
1364          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
1365          *      functions and
1366          *  (b) always process RX events before TX status events if ordering
1367          *      can be unknown, for example with different interrupt status
1368          *      bits.
1369          */
1370         if (test_sta_flags(sta, WLAN_STA_PS) &&
1371             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
1372                 ieee80211_remove_tx_extra(local, sta->key, skb);
1373                 skb_queue_tail(&sta->tx_filtered, skb);
1374                 return;
1375         }
1376
1377         if (!test_sta_flags(sta, WLAN_STA_PS) &&
1378             !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
1379                 /* Software retry the packet once */
1380                 info->flags |= IEEE80211_TX_CTL_REQUEUE;
1381                 ieee80211_remove_tx_extra(local, sta->key, skb);
1382                 dev_queue_xmit(skb);
1383                 return;
1384         }
1385
1386 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1387         if (net_ratelimit())
1388                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
1389                        "queue_len=%d PS=%d @%lu\n",
1390                        wiphy_name(local->hw.wiphy),
1391                        skb_queue_len(&sta->tx_filtered),
1392                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
1393 #endif
1394         dev_kfree_skb(skb);
1395 }
1396
1397 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1398 {
1399         struct sk_buff *skb2;
1400         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1401         struct ieee80211_local *local = hw_to_local(hw);
1402         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1403         u16 frag, type;
1404         __le16 fc;
1405         struct ieee80211_tx_status_rtap_hdr *rthdr;
1406         struct ieee80211_sub_if_data *sdata;
1407         struct net_device *prev_dev = NULL;
1408         struct sta_info *sta;
1409
1410         rcu_read_lock();
1411
1412         if (info->status.excessive_retries) {
1413                 sta = sta_info_get(local, hdr->addr1);
1414                 if (sta) {
1415                         if (test_sta_flags(sta, WLAN_STA_PS)) {
1416                                 /*
1417                                  * The STA is in power save mode, so assume
1418                                  * that this TX packet failed because of that.
1419                                  */
1420                                 ieee80211_handle_filtered_frame(local, sta, skb);
1421                                 rcu_read_unlock();
1422                                 return;
1423                         }
1424                 }
1425         }
1426
1427         fc = hdr->frame_control;
1428
1429         if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
1430             (ieee80211_is_data_qos(fc))) {
1431                 u16 tid, ssn;
1432                 u8 *qc;
1433                 sta = sta_info_get(local, hdr->addr1);
1434                 if (sta) {
1435                         qc = ieee80211_get_qos_ctl(hdr);
1436                         tid = qc[0] & 0xf;
1437                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
1438                                                 & IEEE80211_SCTL_SEQ);
1439                         ieee80211_send_bar(sta->sdata, hdr->addr1,
1440                                            tid, ssn);
1441                 }
1442         }
1443
1444         if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
1445                 sta = sta_info_get(local, hdr->addr1);
1446                 if (sta) {
1447                         ieee80211_handle_filtered_frame(local, sta, skb);
1448                         rcu_read_unlock();
1449                         return;
1450                 }
1451         } else
1452                 rate_control_tx_status(local->mdev, skb);
1453
1454         rcu_read_unlock();
1455
1456         ieee80211_led_tx(local, 0);
1457
1458         /* SNMP counters
1459          * Fragments are passed to low-level drivers as separate skbs, so these
1460          * are actually fragments, not frames. Update frame counters only for
1461          * the first fragment of the frame. */
1462
1463         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
1464         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
1465
1466         if (info->flags & IEEE80211_TX_STAT_ACK) {
1467                 if (frag == 0) {
1468                         local->dot11TransmittedFrameCount++;
1469                         if (is_multicast_ether_addr(hdr->addr1))
1470                                 local->dot11MulticastTransmittedFrameCount++;
1471                         if (info->status.retry_count > 0)
1472                                 local->dot11RetryCount++;
1473                         if (info->status.retry_count > 1)
1474                                 local->dot11MultipleRetryCount++;
1475                 }
1476
1477                 /* This counter shall be incremented for an acknowledged MPDU
1478                  * with an individual address in the address 1 field or an MPDU
1479                  * with a multicast address in the address 1 field of type Data
1480                  * or Management. */
1481                 if (!is_multicast_ether_addr(hdr->addr1) ||
1482                     type == IEEE80211_FTYPE_DATA ||
1483                     type == IEEE80211_FTYPE_MGMT)
1484                         local->dot11TransmittedFragmentCount++;
1485         } else {
1486                 if (frag == 0)
1487                         local->dot11FailedCount++;
1488         }
1489
1490         /* this was a transmitted frame, but now we want to reuse it */
1491         skb_orphan(skb);
1492
1493         /*
1494          * This is a bit racy but we can avoid a lot of work
1495          * with this test...
1496          */
1497         if (!local->monitors && !local->cooked_mntrs) {
1498                 dev_kfree_skb(skb);
1499                 return;
1500         }
1501
1502         /* send frame to monitor interfaces now */
1503
1504         if (skb_headroom(skb) < sizeof(*rthdr)) {
1505                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
1506                 dev_kfree_skb(skb);
1507                 return;
1508         }
1509
1510         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
1511                                 skb_push(skb, sizeof(*rthdr));
1512
1513         memset(rthdr, 0, sizeof(*rthdr));
1514         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1515         rthdr->hdr.it_present =
1516                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
1517                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
1518
1519         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
1520             !is_multicast_ether_addr(hdr->addr1))
1521                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
1522
1523         if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
1524             (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
1525                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
1526         else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
1527                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
1528
1529         rthdr->data_retries = info->status.retry_count;
1530
1531         /* XXX: is this sufficient for BPF? */
1532         skb_set_mac_header(skb, 0);
1533         skb->ip_summed = CHECKSUM_UNNECESSARY;
1534         skb->pkt_type = PACKET_OTHERHOST;
1535         skb->protocol = htons(ETH_P_802_2);
1536         memset(skb->cb, 0, sizeof(skb->cb));
1537
1538         rcu_read_lock();
1539         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1540                 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) {
1541                         if (!netif_running(sdata->dev))
1542                                 continue;
1543
1544                         if (prev_dev) {
1545                                 skb2 = skb_clone(skb, GFP_ATOMIC);
1546                                 if (skb2) {
1547                                         skb2->dev = prev_dev;
1548                                         netif_rx(skb2);
1549                                 }
1550                         }
1551
1552                         prev_dev = sdata->dev;
1553                 }
1554         }
1555         if (prev_dev) {
1556                 skb->dev = prev_dev;
1557                 netif_rx(skb);
1558                 skb = NULL;
1559         }
1560         rcu_read_unlock();
1561         dev_kfree_skb(skb);
1562 }
1563 EXPORT_SYMBOL(ieee80211_tx_status);
1564
1565 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1566                                         const struct ieee80211_ops *ops)
1567 {
1568         struct ieee80211_local *local;
1569         int priv_size;
1570         struct wiphy *wiphy;
1571
1572         /* Ensure 32-byte alignment of our private data and hw private data.
1573          * We use the wiphy priv data for both our ieee80211_local and for
1574          * the driver's private data
1575          *
1576          * In memory it'll be like this:
1577          *
1578          * +-------------------------+
1579          * | struct wiphy           |
1580          * +-------------------------+
1581          * | struct ieee80211_local  |
1582          * +-------------------------+
1583          * | driver's private data   |
1584          * +-------------------------+
1585          *
1586          */
1587         priv_size = ((sizeof(struct ieee80211_local) +
1588                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
1589                     priv_data_len;
1590
1591         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
1592
1593         if (!wiphy)
1594                 return NULL;
1595
1596         wiphy->privid = mac80211_wiphy_privid;
1597
1598         local = wiphy_priv(wiphy);
1599         local->hw.wiphy = wiphy;
1600
1601         local->hw.priv = (char *)local +
1602                          ((sizeof(struct ieee80211_local) +
1603                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
1604
1605         BUG_ON(!ops->tx);
1606         BUG_ON(!ops->start);
1607         BUG_ON(!ops->stop);
1608         BUG_ON(!ops->config);
1609         BUG_ON(!ops->add_interface);
1610         BUG_ON(!ops->remove_interface);
1611         BUG_ON(!ops->configure_filter);
1612         local->ops = ops;
1613
1614         local->hw.queues = 1; /* default */
1615
1616         local->bridge_packets = 1;
1617
1618         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
1619         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1620         local->short_retry_limit = 7;
1621         local->long_retry_limit = 4;
1622         local->hw.conf.radio_enabled = 1;
1623
1624         INIT_LIST_HEAD(&local->interfaces);
1625
1626         spin_lock_init(&local->key_lock);
1627
1628         INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1629
1630         sta_info_init(local);
1631
1632         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1633                      (unsigned long)local);
1634         tasklet_disable(&local->tx_pending_tasklet);
1635
1636         tasklet_init(&local->tasklet,
1637                      ieee80211_tasklet_handler,
1638                      (unsigned long) local);
1639         tasklet_disable(&local->tasklet);
1640
1641         skb_queue_head_init(&local->skb_queue);
1642         skb_queue_head_init(&local->skb_queue_unreliable);
1643
1644         return local_to_hw(local);
1645 }
1646 EXPORT_SYMBOL(ieee80211_alloc_hw);
1647
1648 int ieee80211_register_hw(struct ieee80211_hw *hw)
1649 {
1650         struct ieee80211_local *local = hw_to_local(hw);
1651         const char *name;
1652         int result;
1653         enum ieee80211_band band;
1654         struct net_device *mdev;
1655         struct wireless_dev *mwdev;
1656
1657         /*
1658          * generic code guarantees at least one band,
1659          * set this very early because much code assumes
1660          * that hw.conf.channel is assigned
1661          */
1662         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1663                 struct ieee80211_supported_band *sband;
1664
1665                 sband = local->hw.wiphy->bands[band];
1666                 if (sband) {
1667                         /* init channel we're on */
1668                         local->hw.conf.channel =
1669                         local->oper_channel =
1670                         local->scan_channel = &sband->channels[0];
1671                         break;
1672                 }
1673         }
1674
1675         result = wiphy_register(local->hw.wiphy);
1676         if (result < 0)
1677                 return result;
1678
1679         /*
1680          * We use the number of queues for feature tests (QoS, HT) internally
1681          * so restrict them appropriately.
1682          */
1683         if (hw->queues > IEEE80211_MAX_QUEUES)
1684                 hw->queues = IEEE80211_MAX_QUEUES;
1685         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
1686                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
1687         if (hw->queues < 4)
1688                 hw->ampdu_queues = 0;
1689
1690         mdev = alloc_netdev_mq(sizeof(struct wireless_dev),
1691                                "wmaster%d", ether_setup,
1692                                ieee80211_num_queues(hw));
1693         if (!mdev)
1694                 goto fail_mdev_alloc;
1695
1696         mwdev = netdev_priv(mdev);
1697         mdev->ieee80211_ptr = mwdev;
1698         mwdev->wiphy = local->hw.wiphy;
1699
1700         local->mdev = mdev;
1701
1702         ieee80211_rx_bss_list_init(local);
1703
1704         mdev->hard_start_xmit = ieee80211_master_start_xmit;
1705         mdev->open = ieee80211_master_open;
1706         mdev->stop = ieee80211_master_stop;
1707         mdev->type = ARPHRD_IEEE80211;
1708         mdev->header_ops = &ieee80211_header_ops;
1709         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
1710
1711         name = wiphy_dev(local->hw.wiphy)->driver->name;
1712         local->hw.workqueue = create_freezeable_workqueue(name);
1713         if (!local->hw.workqueue) {
1714                 result = -ENOMEM;
1715                 goto fail_workqueue;
1716         }
1717
1718         /*
1719          * The hardware needs headroom for sending the frame,
1720          * and we need some headroom for passing the frame to monitor
1721          * interfaces, but never both at the same time.
1722          */
1723         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1724                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
1725
1726         debugfs_hw_add(local);
1727
1728         if (local->hw.conf.beacon_int < 10)
1729                 local->hw.conf.beacon_int = 100;
1730
1731         if (local->hw.max_listen_interval == 0)
1732                 local->hw.max_listen_interval = 1;
1733
1734         local->hw.conf.listen_interval = local->hw.max_listen_interval;
1735
1736         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
1737                                                   IEEE80211_HW_SIGNAL_DB |
1738                                                   IEEE80211_HW_SIGNAL_DBM) ?
1739                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1740         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
1741                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1742         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
1743                 local->wstats_flags |= IW_QUAL_DBM;
1744
1745         result = sta_info_start(local);
1746         if (result < 0)
1747                 goto fail_sta_info;
1748
1749         rtnl_lock();
1750         result = dev_alloc_name(local->mdev, local->mdev->name);
1751         if (result < 0)
1752                 goto fail_dev;
1753
1754         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1755         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1756
1757         result = register_netdevice(local->mdev);
1758         if (result < 0)
1759                 goto fail_dev;
1760
1761         result = ieee80211_init_rate_ctrl_alg(local,
1762                                               hw->rate_control_algorithm);
1763         if (result < 0) {
1764                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1765                        "algorithm\n", wiphy_name(local->hw.wiphy));
1766                 goto fail_rate;
1767         }
1768
1769         result = ieee80211_wep_init(local);
1770
1771         if (result < 0) {
1772                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
1773                        wiphy_name(local->hw.wiphy), result);
1774                 goto fail_wep;
1775         }
1776
1777         local->mdev->select_queue = ieee80211_select_queue;
1778
1779         /* add one default STA interface */
1780         result = ieee80211_if_add(local, "wlan%d", NULL,
1781                                   IEEE80211_IF_TYPE_STA, NULL);
1782         if (result)
1783                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1784                        wiphy_name(local->hw.wiphy));
1785
1786         rtnl_unlock();
1787
1788         ieee80211_led_init(local);
1789
1790         return 0;
1791
1792 fail_wep:
1793         rate_control_deinitialize(local);
1794 fail_rate:
1795         unregister_netdevice(local->mdev);
1796         local->mdev = NULL;
1797 fail_dev:
1798         rtnl_unlock();
1799         sta_info_stop(local);
1800 fail_sta_info:
1801         debugfs_hw_del(local);
1802         destroy_workqueue(local->hw.workqueue);
1803 fail_workqueue:
1804         if (local->mdev)
1805                 free_netdev(local->mdev);
1806 fail_mdev_alloc:
1807         wiphy_unregister(local->hw.wiphy);
1808         return result;
1809 }
1810 EXPORT_SYMBOL(ieee80211_register_hw);
1811
1812 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1813 {
1814         struct ieee80211_local *local = hw_to_local(hw);
1815
1816         tasklet_kill(&local->tx_pending_tasklet);
1817         tasklet_kill(&local->tasklet);
1818
1819         rtnl_lock();
1820
1821         /*
1822          * At this point, interface list manipulations are fine
1823          * because the driver cannot be handing us frames any
1824          * more and the tasklet is killed.
1825          */
1826
1827         /* First, we remove all virtual interfaces. */
1828         ieee80211_remove_interfaces(local);
1829
1830         /* then, finally, remove the master interface */
1831         unregister_netdevice(local->mdev);
1832
1833         rtnl_unlock();
1834
1835         ieee80211_rx_bss_list_deinit(local);
1836         ieee80211_clear_tx_pending(local);
1837         sta_info_stop(local);
1838         rate_control_deinitialize(local);
1839         debugfs_hw_del(local);
1840
1841         if (skb_queue_len(&local->skb_queue)
1842                         || skb_queue_len(&local->skb_queue_unreliable))
1843                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1844                        wiphy_name(local->hw.wiphy));
1845         skb_queue_purge(&local->skb_queue);
1846         skb_queue_purge(&local->skb_queue_unreliable);
1847
1848         destroy_workqueue(local->hw.workqueue);
1849         wiphy_unregister(local->hw.wiphy);
1850         ieee80211_wep_free(local);
1851         ieee80211_led_exit(local);
1852         free_netdev(local->mdev);
1853 }
1854 EXPORT_SYMBOL(ieee80211_unregister_hw);
1855
1856 void ieee80211_free_hw(struct ieee80211_hw *hw)
1857 {
1858         struct ieee80211_local *local = hw_to_local(hw);
1859
1860         wiphy_free(local->hw.wiphy);
1861 }
1862 EXPORT_SYMBOL(ieee80211_free_hw);
1863
1864 static int __init ieee80211_init(void)
1865 {
1866         struct sk_buff *skb;
1867         int ret;
1868
1869         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1870         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1871                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1872
1873         ret = rc80211_pid_init();
1874         if (ret)
1875                 return ret;
1876
1877         ieee80211_debugfs_netdev_init();
1878
1879         return 0;
1880 }
1881
1882 static void __exit ieee80211_exit(void)
1883 {
1884         rc80211_pid_exit();
1885
1886         /*
1887          * For key todo, it'll be empty by now but the work
1888          * might still be scheduled.
1889          */
1890         flush_scheduled_work();
1891
1892         if (mesh_allocated)
1893                 ieee80211s_stop();
1894
1895         ieee80211_debugfs_netdev_exit();
1896 }
1897
1898
1899 subsys_initcall(ieee80211_init);
1900 module_exit(ieee80211_exit);
1901
1902 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1903 MODULE_LICENSE("GPL");