err.no Git - linux-2.6/blob - net/mac80211/main.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <net/mac80211.h>
  12 #include <net/ieee80211_radiotap.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/types.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/wireless.h>
  22 #include <linux/rtnetlink.h>
  23 #include <linux/bitmap.h>
  24 #include <net/net_namespace.h>
  25 #include <net/cfg80211.h>
  26
  27 #include "ieee80211_i.h"
  28 #include "rate.h"
  29 #include "mesh.h"
  30 #include "wep.h"
  31 #include "wme.h"
  32 #include "aes_ccm.h"
  33 #include "led.h"
  34 #include "cfg.h"
  35 #include "debugfs.h"
  36 #include "debugfs_netdev.h"
  37
  38 #define SUPP_MCS_SET_LEN 16
  39
  40 /*
  41  * For seeing transmitted packets on monitor interfaces
  42  * we have a radiotap header too.
  43  */
  44 struct ieee80211_tx_status_rtap_hdr {
  45         struct ieee80211_radiotap_header hdr;
  46         __le16 tx_flags;
  47         u8 data_retries;
  48 } __attribute__ ((packed));
  49
  50 /* common interface routines */
  51
  52 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
  53 {
  54         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
  55         return ETH_ALEN;
  56 }
  57
  58 /* must be called under mdev tx lock */
  59 static void ieee80211_configure_filter(struct ieee80211_local *local)
  60 {
  61         unsigned int changed_flags;
  62         unsigned int new_flags = 0;
  63
  64         if (atomic_read(&local->iff_promiscs))
  65                 new_flags |= FIF_PROMISC_IN_BSS;
  66
  67         if (atomic_read(&local->iff_allmultis))
  68                 new_flags |= FIF_ALLMULTI;
  69
  70         if (local->monitors)
  71                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  72
  73         if (local->fif_fcsfail)
  74                 new_flags |= FIF_FCSFAIL;
  75
  76         if (local->fif_plcpfail)
  77                 new_flags |= FIF_PLCPFAIL;
  78
  79         if (local->fif_control)
  80                 new_flags |= FIF_CONTROL;
  81
  82         if (local->fif_other_bss)
  83                 new_flags |= FIF_OTHER_BSS;
  84
  85         changed_flags = local->filter_flags ^ new_flags;
  86
  87         /* be a bit nasty */
  88         new_flags |= (1<<31);
  89
  90         local->ops->configure_filter(local_to_hw(local),
  91                                      changed_flags, &new_flags,
  92                                      local->mdev->mc_count,
  93                                      local->mdev->mc_list);
  94
  95         WARN_ON(new_flags & (1<<31));
  96
  97         local->filter_flags = new_flags & ~(1<<31);
  98 }
  99
 100 /* master interface */
 101
 102 static int ieee80211_master_open(struct net_device *dev)
 103 {
 104         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 105         struct ieee80211_sub_if_data *sdata;
 106         int res = -EOPNOTSUPP;
 107
 108         /* we hold the RTNL here so can safely walk the list */
 109         list_for_each_entry(sdata, &local->interfaces, list) {
 110                 if (sdata->dev != dev && netif_running(sdata->dev)) {
 111                         res = 0;
 112                         break;
 113                 }
 114         }
 115         return res;
 116 }
 117
 118 static int ieee80211_master_stop(struct net_device *dev)
 119 {
 120         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 121         struct ieee80211_sub_if_data *sdata;
 122
 123         /* we hold the RTNL here so can safely walk the list */
 124         list_for_each_entry(sdata, &local->interfaces, list)
 125                 if (sdata->dev != dev && netif_running(sdata->dev))
 126                         dev_close(sdata->dev);
 127
 128         return 0;
 129 }
 130
 131 static void ieee80211_master_set_multicast_list(struct net_device *dev)
 132 {
 133         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 134
 135         ieee80211_configure_filter(local);
 136 }
 137
 138 /* regular interfaces */
 139
 140 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 141 {
 142         int meshhdrlen;
 143         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 144
 145         meshhdrlen = (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) ? 5 : 0;
 146
 147         /* FIX: what would be proper limits for MTU?
 148          * This interface uses 802.3 frames. */
 149         if (new_mtu < 256 ||
 150                 new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
 151                 printk(KERN_WARNING "%s: invalid MTU %d\n",
 152                        dev->name, new_mtu);
 153                 return -EINVAL;
 154         }
 155
 156 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 157         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
 158 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 159         dev->mtu = new_mtu;
 160         return 0;
 161 }
 162
 163 static inline int identical_mac_addr_allowed(int type1, int type2)
 164 {
 165         return (type1 == IEEE80211_IF_TYPE_MNTR ||
 166                 type2 == IEEE80211_IF_TYPE_MNTR ||
 167                 (type1 == IEEE80211_IF_TYPE_AP &&
 168                  type2 == IEEE80211_IF_TYPE_WDS) ||
 169                 (type1 == IEEE80211_IF_TYPE_WDS &&
 170                  (type2 == IEEE80211_IF_TYPE_WDS ||
 171                   type2 == IEEE80211_IF_TYPE_AP)) ||
 172                 (type1 == IEEE80211_IF_TYPE_AP &&
 173                  type2 == IEEE80211_IF_TYPE_VLAN) ||
 174                 (type1 == IEEE80211_IF_TYPE_VLAN &&
 175                  (type2 == IEEE80211_IF_TYPE_AP ||
 176                   type2 == IEEE80211_IF_TYPE_VLAN)));
 177 }
 178
 179 static int ieee80211_open(struct net_device *dev)
 180 {
 181         struct ieee80211_sub_if_data *sdata, *nsdata;
 182         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 183         struct ieee80211_if_init_conf conf;
 184         int res;
 185         bool need_hw_reconfig = 0;
 186         struct sta_info *sta;
 187
 188         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 189
 190         /* we hold the RTNL here so can safely walk the list */
 191         list_for_each_entry(nsdata, &local->interfaces, list) {
 192                 struct net_device *ndev = nsdata->dev;
 193
 194                 if (ndev != dev && ndev != local->mdev && netif_running(ndev)) {
 195                         /*
 196                          * Allow only a single IBSS interface to be up at any
 197                          * time. This is restricted because beacon distribution
 198                          * cannot work properly if both are in the same IBSS.
 199                          *
 200                          * To remove this restriction we'd have to disallow them
 201                          * from setting the same SSID on different IBSS interfaces
 202                          * belonging to the same hardware. Then, however, we're
 203                          * faced with having to adopt two different TSF timers...
 204                          */
 205                         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
 206                             nsdata->vif.type == IEEE80211_IF_TYPE_IBSS)
 207                                 return -EBUSY;
 208
 209                         /*
 210                          * Disallow multiple IBSS/STA mode interfaces.
 211                          *
 212                          * This is a technical restriction, it is possible although
 213                          * most likely not IEEE 802.11 compliant to have multiple
 214                          * STAs with just a single hardware (the TSF timer will not
 215                          * be adjusted properly.)
 216                          *
 217                          * However, because mac80211 uses the master device's BSS
 218                          * information for each STA/IBSS interface, doing this will
 219                          * currently corrupt that BSS information completely, unless,
 220                          * a not very useful case, both STAs are associated to the
 221                          * same BSS.
 222                          *
 223                          * To remove this restriction, the BSS information needs to
 224                          * be embedded in the STA/IBSS mode sdata instead of using
 225                          * the master device's BSS structure.
 226                          */
 227                         if ((sdata->vif.type == IEEE80211_IF_TYPE_STA ||
 228                              sdata->vif.type == IEEE80211_IF_TYPE_IBSS) &&
 229                             (nsdata->vif.type == IEEE80211_IF_TYPE_STA ||
 230                              nsdata->vif.type == IEEE80211_IF_TYPE_IBSS))
 231                                 return -EBUSY;
 232
 233                         /*
 234                          * The remaining checks are only performed for interfaces
 235                          * with the same MAC address.
 236                          */
 237                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 238                                 continue;
 239
 240                         /*
 241                          * check whether it may have the same address
 242                          */
 243                         if (!identical_mac_addr_allowed(sdata->vif.type,
 244                                                         nsdata->vif.type))
 245                                 return -ENOTUNIQ;
 246
 247                         /*
 248                          * can only add VLANs to enabled APs
 249                          */
 250                         if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN &&
 251                             nsdata->vif.type == IEEE80211_IF_TYPE_AP)
 252                                 sdata->u.vlan.ap = nsdata;
 253                 }
 254         }
 255
 256         switch (sdata->vif.type) {
 257         case IEEE80211_IF_TYPE_WDS:
 258                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 259                         return -ENOLINK;
 260
 261                 /* Create STA entry for the WDS peer */
 262                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 263                                      GFP_KERNEL);
 264                 if (!sta)
 265                         return -ENOMEM;
 266
 267                 sta->flags |= WLAN_STA_AUTHORIZED;
 268
 269                 res = sta_info_insert(sta);
 270                 if (res) {
 271                         /* STA has been freed */
 272                         return res;
 273                 }
 274                 break;
 275         case IEEE80211_IF_TYPE_VLAN:
 276                 if (!sdata->u.vlan.ap)
 277                         return -ENOLINK;
 278                 break;
 279         case IEEE80211_IF_TYPE_AP:
 280         case IEEE80211_IF_TYPE_STA:
 281         case IEEE80211_IF_TYPE_MNTR:
 282         case IEEE80211_IF_TYPE_IBSS:
 283         case IEEE80211_IF_TYPE_MESH_POINT:
 284                 /* no special treatment */
 285                 break;
 286         case IEEE80211_IF_TYPE_INVALID:
 287                 /* cannot happen */
 288                 WARN_ON(1);
 289                 break;
 290         }
 291
 292         if (local->open_count == 0) {
 293                 res = 0;
 294                 if (local->ops->start)
 295                         res = local->ops->start(local_to_hw(local));
 296                 if (res)
 297                         return res;
 298                 need_hw_reconfig = 1;
 299                 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
 300         }
 301
 302         switch (sdata->vif.type) {
 303         case IEEE80211_IF_TYPE_VLAN:
 304                 list_add(&sdata->u.vlan.list, &sdata->u.vlan.ap->u.ap.vlans);
 305                 /* no need to tell driver */
 306                 break;
 307         case IEEE80211_IF_TYPE_MNTR:
 308                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 309                         local->cooked_mntrs++;
 310                         break;
 311                 }
 312
 313                 /* must be before the call to ieee80211_configure_filter */
 314                 local->monitors++;
 315                 if (local->monitors == 1)
 316                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 317
 318                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 319                         local->fif_fcsfail++;
 320                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 321                         local->fif_plcpfail++;
 322                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 323                         local->fif_control++;
 324                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 325                         local->fif_other_bss++;
 326
 327                 netif_tx_lock_bh(local->mdev);
 328                 ieee80211_configure_filter(local);
 329                 netif_tx_unlock_bh(local->mdev);
 330                 break;
 331         case IEEE80211_IF_TYPE_STA:
 332         case IEEE80211_IF_TYPE_IBSS:
 333                 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
 334                 /* fall through */
 335         default:
 336                 conf.vif = &sdata->vif;
 337                 conf.type = sdata->vif.type;
 338                 conf.mac_addr = dev->dev_addr;
 339                 res = local->ops->add_interface(local_to_hw(local), &conf);
 340                 if (res && !local->open_count && local->ops->stop)
 341                         local->ops->stop(local_to_hw(local));
 342                 if (res)
 343                         return res;
 344
 345                 ieee80211_if_config(dev);
 346                 ieee80211_reset_erp_info(dev);
 347                 ieee80211_enable_keys(sdata);
 348
 349                 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
 350                     !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
 351                         netif_carrier_off(dev);
 352                 else
 353                         netif_carrier_on(dev);
 354         }
 355
 356         if (local->open_count == 0) {
 357                 res = dev_open(local->mdev);
 358                 WARN_ON(res);
 359                 tasklet_enable(&local->tx_pending_tasklet);
 360                 tasklet_enable(&local->tasklet);
 361         }
 362
 363         /*
 364          * set_multicast_list will be invoked by the networking core
 365          * which will check whether any increments here were done in
 366          * error and sync them down to the hardware as filter flags.
 367          */
 368         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 369                 atomic_inc(&local->iff_allmultis);
 370
 371         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 372                 atomic_inc(&local->iff_promiscs);
 373
 374         local->open_count++;
 375         if (need_hw_reconfig)
 376                 ieee80211_hw_config(local);
 377
 378         /*
 379          * ieee80211_sta_work is disabled while network interface
 380          * is down. Therefore, some configuration changes may not
 381          * yet be effective. Trigger execution of ieee80211_sta_work
 382          * to fix this.
 383          */
 384         if(sdata->vif.type == IEEE80211_IF_TYPE_STA ||
 385            sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
 386                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 387                 queue_work(local->hw.workqueue, &ifsta->work);
 388         }
 389
 390         netif_start_queue(dev);
 391
 392         return 0;
 393 }
 394
 395 static int ieee80211_stop(struct net_device *dev)
 396 {
 397         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 398         struct ieee80211_local *local = sdata->local;
 399         struct ieee80211_if_init_conf conf;
 400         struct sta_info *sta;
 401
 402         /*
 403          * Stop TX on this interface first.
 404          */
 405         netif_stop_queue(dev);
 406
 407         /*
 408          * Now delete all active aggregation sessions.
 409          */
 410         rcu_read_lock();
 411
 412         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 413                 if (sta->sdata == sdata)
 414                         ieee80211_sta_tear_down_BA_sessions(dev, sta->addr);
 415         }
 416
 417         rcu_read_unlock();
 418
 419         /*
 420          * Remove all stations associated with this interface.
 421          *
 422          * This must be done before calling ops->remove_interface()
 423          * because otherwise we can later invoke ops->sta_notify()
 424          * whenever the STAs are removed, and that invalidates driver
 425          * assumptions about always getting a vif pointer that is valid
 426          * (because if we remove a STA after ops->remove_interface()
 427          * the driver will have removed the vif info already!)
 428          *
 429          * We could relax this and only unlink the stations from the
 430          * hash table and list but keep them on a per-sdata list that
 431          * will be inserted back again when the interface is brought
 432          * up again, but I don't currently see a use case for that,
 433          * except with WDS which gets a STA entry created when it is
 434          * brought up.
 435          */
 436         sta_info_flush(local, sdata);
 437
 438         /*
 439          * Don't count this interface for promisc/allmulti while it
 440          * is down. dev_mc_unsync() will invoke set_multicast_list
 441          * on the master interface which will sync these down to the
 442          * hardware as filter flags.
 443          */
 444         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 445                 atomic_dec(&local->iff_allmultis);
 446
 447         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 448                 atomic_dec(&local->iff_promiscs);
 449
 450         dev_mc_unsync(local->mdev, dev);
 451
 452         /* APs need special treatment */
 453         if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
 454                 struct ieee80211_sub_if_data *vlan, *tmp;
 455                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 456
 457                 /* remove beacon */
 458                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 459                 synchronize_rcu();
 460                 kfree(old_beacon);
 461
 462                 /* down all dependent devices, that is VLANs */
 463                 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
 464                                          u.vlan.list)
 465                         dev_close(vlan->dev);
 466                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 467         }
 468
 469         local->open_count--;
 470
 471         switch (sdata->vif.type) {
 472         case IEEE80211_IF_TYPE_VLAN:
 473                 list_del(&sdata->u.vlan.list);
 474                 sdata->u.vlan.ap = NULL;
 475                 /* no need to tell driver */
 476                 break;
 477         case IEEE80211_IF_TYPE_MNTR:
 478                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 479                         local->cooked_mntrs--;
 480                         break;
 481                 }
 482
 483                 local->monitors--;
 484                 if (local->monitors == 0)
 485                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
 486
 487                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 488                         local->fif_fcsfail--;
 489                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 490                         local->fif_plcpfail--;
 491                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 492                         local->fif_control--;
 493                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 494                         local->fif_other_bss--;
 495
 496                 netif_tx_lock_bh(local->mdev);
 497                 ieee80211_configure_filter(local);
 498                 netif_tx_unlock_bh(local->mdev);
 499                 break;
 500         case IEEE80211_IF_TYPE_MESH_POINT:
 501         case IEEE80211_IF_TYPE_STA:
 502         case IEEE80211_IF_TYPE_IBSS:
 503                 sdata->u.sta.state = IEEE80211_DISABLED;
 504                 del_timer_sync(&sdata->u.sta.timer);
 505                 /*
 506                  * When we get here, the interface is marked down.
 507                  * Call synchronize_rcu() to wait for the RX path
 508                  * should it be using the interface and enqueuing
 509                  * frames at this very time on another CPU.
 510                  */
 511                 synchronize_rcu();
 512                 skb_queue_purge(&sdata->u.sta.skb_queue);
 513
 514                 if (local->scan_dev == sdata->dev) {
 515                         if (!local->ops->hw_scan) {
 516                                 local->sta_sw_scanning = 0;
 517                                 cancel_delayed_work(&local->scan_work);
 518                         } else
 519                                 local->sta_hw_scanning = 0;
 520                 }
 521
 522                 flush_workqueue(local->hw.workqueue);
 523
 524                 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
 525                 kfree(sdata->u.sta.extra_ie);
 526                 sdata->u.sta.extra_ie = NULL;
 527                 sdata->u.sta.extra_ie_len = 0;
 528                 /* fall through */
 529         default:
 530                 conf.vif = &sdata->vif;
 531                 conf.type = sdata->vif.type;
 532                 conf.mac_addr = dev->dev_addr;
 533                 /* disable all keys for as long as this netdev is down */
 534                 ieee80211_disable_keys(sdata);
 535                 local->ops->remove_interface(local_to_hw(local), &conf);
 536         }
 537
 538         if (local->open_count == 0) {
 539                 if (netif_running(local->mdev))
 540                         dev_close(local->mdev);
 541
 542                 if (local->ops->stop)
 543                         local->ops->stop(local_to_hw(local));
 544
 545                 ieee80211_led_radio(local, 0);
 546
 547                 tasklet_disable(&local->tx_pending_tasklet);
 548                 tasklet_disable(&local->tasklet);
 549         }
 550
 551         return 0;
 552 }
 553
 554 int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid)
 555 {
 556         struct ieee80211_local *local = hw_to_local(hw);
 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                 printk(KERN_DEBUG "Could not find the station\n");
 577                 rcu_read_unlock();
 578                 return -ENOENT;
 579         }
 580
 581         spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
 582
 583         /* we have tried too many times, receiver does not want A-MPDU */
 584         if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
 585                 ret = -EBUSY;
 586                 goto start_ba_exit;
 587         }
 588
 589         state = &sta->ampdu_mlme.tid_state_tx[tid];
 590         /* check if the TID is not in aggregation flow already */
 591         if (*state != HT_AGG_STATE_IDLE) {
 592 #ifdef CONFIG_MAC80211_HT_DEBUG
 593                 printk(KERN_DEBUG "BA request denied - session is not "
 594                                  "idle on tid %u\n", tid);
 595 #endif /* CONFIG_MAC80211_HT_DEBUG */
 596                 ret = -EAGAIN;
 597                 goto start_ba_exit;
 598         }
 599
 600         /* prepare A-MPDU MLME for Tx aggregation */
 601         sta->ampdu_mlme.tid_tx[tid] =
 602                         kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
 603         if (!sta->ampdu_mlme.tid_tx[tid]) {
 604                 if (net_ratelimit())
 605                         printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
 606                                         tid);
 607                 ret = -ENOMEM;
 608                 goto start_ba_exit;
 609         }
 610         /* Tx timer */
 611         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function =
 612                         sta_addba_resp_timer_expired;
 613         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data =
 614                         (unsigned long)&sta->timer_to_tid[tid];
 615         init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
 616
 617         /* ensure that TX flow won't interrupt us
 618          * until the end of the call to requeue function */
 619         spin_lock_bh(&local->mdev->queue_lock);
 620
 621         /* create a new queue for this aggregation */
 622         ret = ieee80211_ht_agg_queue_add(local, sta, tid);
 623
 624         /* case no queue is available to aggregation
 625          * don't switch to aggregation */
 626         if (ret) {
 627 #ifdef CONFIG_MAC80211_HT_DEBUG
 628                 printk(KERN_DEBUG "BA request denied - queue unavailable for"
 629                                         " tid %d\n", tid);
 630 #endif /* CONFIG_MAC80211_HT_DEBUG */
 631                 goto start_ba_err;
 632         }
 633         sdata = sta->sdata;
 634
 635         /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
 636          * call back right away, it must see that the flow has begun */
 637         *state |= HT_ADDBA_REQUESTED_MSK;
 638
 639         if (local->ops->ampdu_action)
 640                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
 641                                                 ra, tid, &start_seq_num);
 642
 643         if (ret) {
 644                 /* No need to requeue the packets in the agg queue, since we
 645                  * held the tx lock: no packet could be enqueued to the newly
 646                  * allocated queue */
 647                  ieee80211_ht_agg_queue_remove(local, sta, tid, 0);
 648 #ifdef CONFIG_MAC80211_HT_DEBUG
 649                 printk(KERN_DEBUG "BA request denied - HW unavailable for"
 650                                         " tid %d\n", tid);
 651 #endif /* CONFIG_MAC80211_HT_DEBUG */
 652                 *state = HT_AGG_STATE_IDLE;
 653                 goto start_ba_err;
 654         }
 655
 656         /* Will put all the packets in the new SW queue */
 657         ieee80211_requeue(local, ieee802_1d_to_ac[tid]);
 658         spin_unlock_bh(&local->mdev->queue_lock);
 659
 660         /* send an addBA request */
 661         sta->ampdu_mlme.dialog_token_allocator++;
 662         sta->ampdu_mlme.tid_tx[tid]->dialog_token =
 663                         sta->ampdu_mlme.dialog_token_allocator;
 664         sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
 665
 666         ieee80211_send_addba_request(sta->sdata->dev, ra, tid,
 667                          sta->ampdu_mlme.tid_tx[tid]->dialog_token,
 668                          sta->ampdu_mlme.tid_tx[tid]->ssn,
 669                          0x40, 5000);
 670
 671         /* activate the timer for the recipient's addBA response */
 672         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
 673                                 jiffies + ADDBA_RESP_INTERVAL;
 674         add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
 675         printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
 676         goto start_ba_exit;
 677
 678 start_ba_err:
 679         kfree(sta->ampdu_mlme.tid_tx[tid]);
 680         sta->ampdu_mlme.tid_tx[tid] = NULL;
 681         spin_unlock_bh(&local->mdev->queue_lock);
 682         ret = -EBUSY;
 683 start_ba_exit:
 684         spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
 685         rcu_read_unlock();
 686         return ret;
 687 }
 688 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
 689
 690 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
 691                                  u8 *ra, u16 tid,
 692                                  enum ieee80211_back_parties initiator)
 693 {
 694         struct ieee80211_local *local = hw_to_local(hw);
 695         struct sta_info *sta;
 696         u8 *state;
 697         int ret = 0;
 698         DECLARE_MAC_BUF(mac);
 699
 700         if (tid >= STA_TID_NUM)
 701                 return -EINVAL;
 702
 703         rcu_read_lock();
 704         sta = sta_info_get(local, ra);
 705         if (!sta) {
 706                 rcu_read_unlock();
 707                 return -ENOENT;
 708         }
 709
 710         /* check if the TID is in aggregation */
 711         state = &sta->ampdu_mlme.tid_state_tx[tid];
 712         spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
 713
 714         if (*state != HT_AGG_STATE_OPERATIONAL) {
 715                 ret = -ENOENT;
 716                 goto stop_BA_exit;
 717         }
 718
 719 #ifdef CONFIG_MAC80211_HT_DEBUG
 720         printk(KERN_DEBUG "Tx BA session stop requested for %s tid %u\n",
 721                                 print_mac(mac, ra), tid);
 722 #endif /* CONFIG_MAC80211_HT_DEBUG */
 723
 724         ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]);
 725
 726         *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
 727                 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
 728
 729         if (local->ops->ampdu_action)
 730                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP,
 731                                                 ra, tid, NULL);
 732
 733         /* case HW denied going back to legacy */
 734         if (ret) {
 735                 WARN_ON(ret != -EBUSY);
 736                 *state = HT_AGG_STATE_OPERATIONAL;
 737                 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
 738                 goto stop_BA_exit;
 739         }
 740
 741 stop_BA_exit:
 742         spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
 743         rcu_read_unlock();
 744         return ret;
 745 }
 746 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
 747
 748 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
 749 {
 750         struct ieee80211_local *local = hw_to_local(hw);
 751         struct sta_info *sta;
 752         u8 *state;
 753         DECLARE_MAC_BUF(mac);
 754
 755         if (tid >= STA_TID_NUM) {
 756                 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
 757                                 tid, STA_TID_NUM);
 758                 return;
 759         }
 760
 761         rcu_read_lock();
 762         sta = sta_info_get(local, ra);
 763         if (!sta) {
 764                 rcu_read_unlock();
 765                 printk(KERN_DEBUG "Could not find station: %s\n",
 766                                 print_mac(mac, ra));
 767                 return;
 768         }
 769
 770         state = &sta->ampdu_mlme.tid_state_tx[tid];
 771         spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
 772
 773         if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
 774                 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
 775                                 *state);
 776                 spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
 777                 rcu_read_unlock();
 778                 return;
 779         }
 780
 781         WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK);
 782
 783         *state |= HT_ADDBA_DRV_READY_MSK;
 784
 785         if (*state == HT_AGG_STATE_OPERATIONAL) {
 786                 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
 787                 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
 788         }
 789         spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
 790         rcu_read_unlock();
 791 }
 792 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
 793
 794 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
 795 {
 796         struct ieee80211_local *local = hw_to_local(hw);
 797         struct sta_info *sta;
 798         u8 *state;
 799         int agg_queue;
 800         DECLARE_MAC_BUF(mac);
 801
 802         if (tid >= STA_TID_NUM) {
 803                 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
 804                                 tid, STA_TID_NUM);
 805                 return;
 806         }
 807
 808 #ifdef CONFIG_MAC80211_HT_DEBUG
 809         printk(KERN_DEBUG "Stopping Tx BA session for %s tid %d\n",
 810                                 print_mac(mac, ra), tid);
 811 #endif /* CONFIG_MAC80211_HT_DEBUG */
 812
 813         rcu_read_lock();
 814         sta = sta_info_get(local, ra);
 815         if (!sta) {
 816                 printk(KERN_DEBUG "Could not find station: %s\n",
 817                                 print_mac(mac, ra));
 818                 rcu_read_unlock();
 819                 return;
 820         }
 821         state = &sta->ampdu_mlme.tid_state_tx[tid];
 822
 823         spin_lock_bh(&sta->ampdu_mlme.ampdu_tx);
 824         if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
 825                 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
 826                 spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
 827                 rcu_read_unlock();
 828                 return;
 829         }
 830
 831         if (*state & HT_AGG_STATE_INITIATOR_MSK)
 832                 ieee80211_send_delba(sta->sdata->dev, ra, tid,
 833                         WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
 834
 835         agg_queue = sta->tid_to_tx_q[tid];
 836
 837         /* avoid ordering issues: we are the only one that can modify
 838          * the content of the qdiscs */
 839         spin_lock_bh(&local->mdev->queue_lock);
 840         /* remove the queue for this aggregation */
 841         ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
 842         spin_unlock_bh(&local->mdev->queue_lock);
 843
 844         /* we just requeued the all the frames that were in the removed
 845          * queue, and since we might miss a softirq we do netif_schedule.
 846          * ieee80211_wake_queue is not used here as this queue is not
 847          * necessarily stopped */
 848         netif_schedule(local->mdev);
 849         *state = HT_AGG_STATE_IDLE;
 850         sta->ampdu_mlme.addba_req_num[tid] = 0;
 851         kfree(sta->ampdu_mlme.tid_tx[tid]);
 852         sta->ampdu_mlme.tid_tx[tid] = NULL;
 853         spin_unlock_bh(&sta->ampdu_mlme.ampdu_tx);
 854
 855         rcu_read_unlock();
 856 }
 857 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
 858
 859 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
 860                                       const u8 *ra, u16 tid)
 861 {
 862         struct ieee80211_local *local = hw_to_local(hw);
 863         struct ieee80211_ra_tid *ra_tid;
 864         struct sk_buff *skb = dev_alloc_skb(0);
 865
 866         if (unlikely(!skb)) {
 867                 if (net_ratelimit())
 868                         printk(KERN_WARNING "%s: Not enough memory, "
 869                                "dropping start BA session", skb->dev->name);
 870                 return;
 871         }
 872         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 873         memcpy(&ra_tid->ra, ra, ETH_ALEN);
 874         ra_tid->tid = tid;
 875
 876         skb->pkt_type = IEEE80211_ADDBA_MSG;
 877         skb_queue_tail(&local->skb_queue, skb);
 878         tasklet_schedule(&local->tasklet);
 879 }
 880 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
 881
 882 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
 883                                      const u8 *ra, u16 tid)
 884 {
 885         struct ieee80211_local *local = hw_to_local(hw);
 886         struct ieee80211_ra_tid *ra_tid;
 887         struct sk_buff *skb = dev_alloc_skb(0);
 888
 889         if (unlikely(!skb)) {
 890                 if (net_ratelimit())
 891                         printk(KERN_WARNING "%s: Not enough memory, "
 892                                "dropping stop BA session", skb->dev->name);
 893                 return;
 894         }
 895         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 896         memcpy(&ra_tid->ra, ra, ETH_ALEN);
 897         ra_tid->tid = tid;
 898
 899         skb->pkt_type = IEEE80211_DELBA_MSG;
 900         skb_queue_tail(&local->skb_queue, skb);
 901         tasklet_schedule(&local->tasklet);
 902 }
 903 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
 904
 905 static void ieee80211_set_multicast_list(struct net_device *dev)
 906 {
 907         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 908         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 909         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 910
 911         allmulti = !!(dev->flags & IFF_ALLMULTI);
 912         promisc = !!(dev->flags & IFF_PROMISC);
 913         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 914         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 915
 916         if (allmulti != sdata_allmulti) {
 917                 if (dev->flags & IFF_ALLMULTI)
 918                         atomic_inc(&local->iff_allmultis);
 919                 else
 920                         atomic_dec(&local->iff_allmultis);
 921                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 922         }
 923
 924         if (promisc != sdata_promisc) {
 925                 if (dev->flags & IFF_PROMISC)
 926                         atomic_inc(&local->iff_promiscs);
 927                 else
 928                         atomic_dec(&local->iff_promiscs);
 929                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 930         }
 931
 932         dev_mc_sync(local->mdev, dev);
 933 }
 934
 935 static const struct header_ops ieee80211_header_ops = {
 936         .create         = eth_header,
 937         .parse          = header_parse_80211,
 938         .rebuild        = eth_rebuild_header,
 939         .cache          = eth_header_cache,
 940         .cache_update   = eth_header_cache_update,
 941 };
 942
 943 /* Must not be called for mdev */
 944 void ieee80211_if_setup(struct net_device *dev)
 945 {
 946         ether_setup(dev);
 947         dev->hard_start_xmit = ieee80211_subif_start_xmit;
 948         dev->wireless_handlers = &ieee80211_iw_handler_def;
 949         dev->set_multicast_list = ieee80211_set_multicast_list;
 950         dev->change_mtu = ieee80211_change_mtu;
 951         dev->open = ieee80211_open;
 952         dev->stop = ieee80211_stop;
 953         dev->destructor = ieee80211_if_free;
 954 }
 955
 956 /* everything else */
 957
 958 static int __ieee80211_if_config(struct net_device *dev,
 959                                  struct sk_buff *beacon,
 960                                  struct ieee80211_tx_control *control)
 961 {
 962         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 963         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 964         struct ieee80211_if_conf conf;
 965
 966         if (!local->ops->config_interface || !netif_running(dev))
 967                 return 0;
 968
 969         memset(&conf, 0, sizeof(conf));
 970         conf.type = sdata->vif.type;
 971         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
 972             sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
 973                 conf.bssid = sdata->u.sta.bssid;
 974                 conf.ssid = sdata->u.sta.ssid;
 975                 conf.ssid_len = sdata->u.sta.ssid_len;
 976         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 977                 conf.beacon = beacon;
 978                 conf.beacon_control = control;
 979                 ieee80211_start_mesh(dev);
 980         } else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
 981                 conf.ssid = sdata->u.ap.ssid;
 982                 conf.ssid_len = sdata->u.ap.ssid_len;
 983                 conf.beacon = beacon;
 984                 conf.beacon_control = control;
 985         }
 986         return local->ops->config_interface(local_to_hw(local),
 987                                             &sdata->vif, &conf);
 988 }
 989
 990 int ieee80211_if_config(struct net_device *dev)
 991 {
 992         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 993         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 994         if (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT &&
 995             (local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
 996                 return ieee80211_if_config_beacon(dev);
 997         return __ieee80211_if_config(dev, NULL, NULL);
 998 }
 999
1000 int ieee80211_if_config_beacon(struct net_device *dev)
1001 {
1002         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
1003         struct ieee80211_tx_control control;
1004         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1005         struct sk_buff *skb;
1006
1007         if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
1008                 return 0;
1009         skb = ieee80211_beacon_get(local_to_hw(local), &sdata->vif,
1010                                    &control);
1011         if (!skb)
1012                 return -ENOMEM;
1013         return __ieee80211_if_config(dev, skb, &control);
1014 }
1015
1016 int ieee80211_hw_config(struct ieee80211_local *local)
1017 {
1018         struct ieee80211_channel *chan;
1019         int ret = 0;
1020
1021         if (local->sta_sw_scanning)
1022                 chan = local->scan_channel;
1023         else
1024                 chan = local->oper_channel;
1025
1026         local->hw.conf.channel = chan;
1027
1028         if (!local->hw.conf.power_level)
1029                 local->hw.conf.power_level = chan->max_power;
1030         else
1031                 local->hw.conf.power_level = min(chan->max_power,
1032                                                local->hw.conf.power_level);
1033
1034         local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
1035
1036 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1037         printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
1038                wiphy_name(local->hw.wiphy), chan->center_freq);
1039 #endif
1040
1041         if (local->open_count)
1042                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
1043
1044         return ret;
1045 }
1046
1047 /**
1048  * ieee80211_handle_ht should be used only after legacy configuration
1049  * has been determined namely band, as ht configuration depends upon
1050  * the hardware's HT abilities for a _specific_ band.
1051  */
1052 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
1053                            struct ieee80211_ht_info *req_ht_cap,
1054                            struct ieee80211_ht_bss_info *req_bss_cap)
1055 {
1056         struct ieee80211_conf *conf = &local->hw.conf;
1057         struct ieee80211_supported_band *sband;
1058         struct ieee80211_ht_info ht_conf;
1059         struct ieee80211_ht_bss_info ht_bss_conf;
1060         int i;
1061         u32 changed = 0;
1062
1063         sband = local->hw.wiphy->bands[conf->channel->band];
1064
1065         /* HT is not supported */
1066         if (!sband->ht_info.ht_supported) {
1067                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1068                 return 0;
1069         }
1070
1071         memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
1072         memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
1073
1074         if (enable_ht) {
1075                 if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
1076                         changed |= BSS_CHANGED_HT;
1077
1078                 conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
1079                 ht_conf.ht_supported = 1;
1080
1081                 ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
1082                 ht_conf.cap &= ~(IEEE80211_HT_CAP_MIMO_PS);
1083                 ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_MIMO_PS;
1084
1085                 for (i = 0; i < SUPP_MCS_SET_LEN; i++)
1086                         ht_conf.supp_mcs_set[i] =
1087                                         sband->ht_info.supp_mcs_set[i] &
1088                                         req_ht_cap->supp_mcs_set[i];
1089
1090                 ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
1091                 ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
1092                 ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
1093
1094                 ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
1095                 ht_conf.ampdu_density = req_ht_cap->ampdu_density;
1096
1097                 /* if bss configuration changed store the new one */
1098                 if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
1099                     memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
1100                         changed |= BSS_CHANGED_HT;
1101                         memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
1102                         memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
1103                 }
1104         } else {
1105                 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
1106                         changed |= BSS_CHANGED_HT;
1107                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1108         }
1109
1110         return changed;
1111 }
1112
1113 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1114                                       u32 changed)
1115 {
1116         struct ieee80211_local *local = sdata->local;
1117
1118         if (!changed)
1119                 return;
1120
1121         if (local->ops->bss_info_changed)
1122                 local->ops->bss_info_changed(local_to_hw(local),
1123                                              &sdata->vif,
1124                                              &sdata->bss_conf,
1125                                              changed);
1126 }
1127
1128 void ieee80211_reset_erp_info(struct net_device *dev)
1129 {
1130         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1131
1132         sdata->bss_conf.use_cts_prot = 0;
1133         sdata->bss_conf.use_short_preamble = 0;
1134         ieee80211_bss_info_change_notify(sdata,
1135                                          BSS_CHANGED_ERP_CTS_PROT |
1136                                          BSS_CHANGED_ERP_PREAMBLE);
1137 }
1138
1139 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
1140                                  struct sk_buff *skb,
1141                                  struct ieee80211_tx_status *status)
1142 {
1143         struct ieee80211_local *local = hw_to_local(hw);
1144         struct ieee80211_tx_status *saved;
1145         int tmp;
1146
1147         skb->dev = local->mdev;
1148         saved = kmalloc(sizeof(struct ieee80211_tx_status), GFP_ATOMIC);
1149         if (unlikely(!saved)) {
1150                 if (net_ratelimit())
1151                         printk(KERN_WARNING "%s: Not enough memory, "
1152                                "dropping tx status", skb->dev->name);
1153                 /* should be dev_kfree_skb_irq, but due to this function being
1154                  * named _irqsafe instead of just _irq we can't be sure that
1155                  * people won't call it from non-irq contexts */
1156                 dev_kfree_skb_any(skb);
1157                 return;
1158         }
1159         memcpy(saved, status, sizeof(struct ieee80211_tx_status));
1160         /* copy pointer to saved status into skb->cb for use by tasklet */
1161         memcpy(skb->cb, &saved, sizeof(saved));
1162
1163         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
1164         skb_queue_tail(status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS ?
1165                        &local->skb_queue : &local->skb_queue_unreliable, skb);
1166         tmp = skb_queue_len(&local->skb_queue) +
1167                 skb_queue_len(&local->skb_queue_unreliable);
1168         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
1169                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1170                 memcpy(&saved, skb->cb, sizeof(saved));
1171                 kfree(saved);
1172                 dev_kfree_skb_irq(skb);
1173                 tmp--;
1174                 I802_DEBUG_INC(local->tx_status_drop);
1175         }
1176         tasklet_schedule(&local->tasklet);
1177 }
1178 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
1179
1180 static void ieee80211_tasklet_handler(unsigned long data)
1181 {
1182         struct ieee80211_local *local = (struct ieee80211_local *) data;
1183         struct sk_buff *skb;
1184         struct ieee80211_rx_status rx_status;
1185         struct ieee80211_tx_status *tx_status;
1186         struct ieee80211_ra_tid *ra_tid;
1187
1188         while ((skb = skb_dequeue(&local->skb_queue)) ||
1189                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1190                 switch (skb->pkt_type) {
1191                 case IEEE80211_RX_MSG:
1192                         /* status is in skb->cb */
1193                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
1194                         /* Clear skb->pkt_type in order to not confuse kernel
1195                          * netstack. */
1196                         skb->pkt_type = 0;
1197                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
1198                         break;
1199                 case IEEE80211_TX_STATUS_MSG:
1200                         /* get pointer to saved status out of skb->cb */
1201                         memcpy(&tx_status, skb->cb, sizeof(tx_status));
1202                         skb->pkt_type = 0;
1203                         ieee80211_tx_status(local_to_hw(local),
1204                                             skb, tx_status);
1205                         kfree(tx_status);
1206                         break;
1207                 case IEEE80211_DELBA_MSG:
1208                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1209                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
1210                                                 ra_tid->ra, ra_tid->tid);
1211                         dev_kfree_skb(skb);
1212                         break;
1213                 case IEEE80211_ADDBA_MSG:
1214                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1215                         ieee80211_start_tx_ba_cb(local_to_hw(local),
1216                                                  ra_tid->ra, ra_tid->tid);
1217                         dev_kfree_skb(skb);
1218                         break ;
1219                 default: /* should never get here! */
1220                         printk(KERN_ERR "%s: Unknown message type (%d)\n",
1221                                wiphy_name(local->hw.wiphy), skb->pkt_type);
1222                         dev_kfree_skb(skb);
1223                         break;
1224                 }
1225         }
1226 }
1227
1228 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
1229  * make a prepared TX frame (one that has been given to hw) to look like brand
1230  * new IEEE 802.11 frame that is ready to go through TX processing again.
1231  * Also, tx_packet_data in cb is restored from tx_control. */
1232 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
1233                                       struct ieee80211_key *key,
1234                                       struct sk_buff *skb,
1235                                       struct ieee80211_tx_control *control)
1236 {
1237         int hdrlen, iv_len, mic_len;
1238         struct ieee80211_tx_packet_data *pkt_data;
1239
1240         pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
1241         pkt_data->ifindex = vif_to_sdata(control->vif)->dev->ifindex;
1242         pkt_data->flags = 0;
1243         if (control->flags & IEEE80211_TXCTL_REQ_TX_STATUS)
1244                 pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
1245         if (control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT)
1246                 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
1247         if (control->flags & IEEE80211_TXCTL_REQUEUE)
1248                 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
1249         if (control->flags & IEEE80211_TXCTL_EAPOL_FRAME)
1250                 pkt_data->flags |= IEEE80211_TXPD_EAPOL_FRAME;
1251         pkt_data->queue = control->queue;
1252
1253         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
1254
1255         if (!key)
1256                 goto no_key;
1257
1258         switch (key->conf.alg) {
1259         case ALG_WEP:
1260                 iv_len = WEP_IV_LEN;
1261                 mic_len = WEP_ICV_LEN;
1262                 break;
1263         case ALG_TKIP:
1264                 iv_len = TKIP_IV_LEN;
1265                 mic_len = TKIP_ICV_LEN;
1266                 break;
1267         case ALG_CCMP:
1268                 iv_len = CCMP_HDR_LEN;
1269                 mic_len = CCMP_MIC_LEN;
1270                 break;
1271         default:
1272                 goto no_key;
1273         }
1274
1275         if (skb->len >= mic_len &&
1276             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
1277                 skb_trim(skb, skb->len - mic_len);
1278         if (skb->len >= iv_len && skb->len > hdrlen) {
1279                 memmove(skb->data + iv_len, skb->data, hdrlen);
1280                 skb_pull(skb, iv_len);
1281         }
1282
1283 no_key:
1284         {
1285                 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1286                 u16 fc = le16_to_cpu(hdr->frame_control);
1287                 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
1288                         fc &= ~IEEE80211_STYPE_QOS_DATA;
1289                         hdr->frame_control = cpu_to_le16(fc);
1290                         memmove(skb->data + 2, skb->data, hdrlen - 2);
1291                         skb_pull(skb, 2);
1292                 }
1293         }
1294 }
1295
1296 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
1297                                             struct sta_info *sta,
1298                                             struct sk_buff *skb,
1299                                             struct ieee80211_tx_status *status)
1300 {
1301         sta->tx_filtered_count++;
1302
1303         /*
1304          * Clear the TX filter mask for this STA when sending the next
1305          * packet. If the STA went to power save mode, this will happen
1306          * happen when it wakes up for the next time.
1307          */
1308         sta->flags |= WLAN_STA_CLEAR_PS_FILT;
1309
1310         /*
1311          * This code races in the following way:
1312          *
1313          *  (1) STA sends frame indicating it will go to sleep and does so
1314          *  (2) hardware/firmware adds STA to filter list, passes frame up
1315          *  (3) hardware/firmware processes TX fifo and suppresses a frame
1316          *  (4) we get TX status before having processed the frame and
1317          *      knowing that the STA has gone to sleep.
1318          *
1319          * This is actually quite unlikely even when both those events are
1320          * processed from interrupts coming in quickly after one another or
1321          * even at the same time because we queue both TX status events and
1322          * RX frames to be processed by a tasklet and process them in the
1323          * same order that they were received or TX status last. Hence, there
1324          * is no race as long as the frame RX is processed before the next TX
1325          * status, which drivers can ensure, see below.
1326          *
1327          * Note that this can only happen if the hardware or firmware can
1328          * actually add STAs to the filter list, if this is done by the
1329          * driver in response to set_tim() (which will only reduce the race
1330          * this whole filtering tries to solve, not completely solve it)
1331          * this situation cannot happen.
1332          *
1333          * To completely solve this race drivers need to make sure that they
1334          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
1335          *      functions and
1336          *  (b) always process RX events before TX status events if ordering
1337          *      can be unknown, for example with different interrupt status
1338          *      bits.
1339          */
1340         if (sta->flags & WLAN_STA_PS &&
1341             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
1342                 ieee80211_remove_tx_extra(local, sta->key, skb,
1343                                           &status->control);
1344                 skb_queue_tail(&sta->tx_filtered, skb);
1345                 return;
1346         }
1347
1348         if (!(sta->flags & WLAN_STA_PS) &&
1349             !(status->control.flags & IEEE80211_TXCTL_REQUEUE)) {
1350                 /* Software retry the packet once */
1351                 status->control.flags |= IEEE80211_TXCTL_REQUEUE;
1352                 ieee80211_remove_tx_extra(local, sta->key, skb,
1353                                           &status->control);
1354                 dev_queue_xmit(skb);
1355                 return;
1356         }
1357
1358         if (net_ratelimit())
1359                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
1360                        "queue_len=%d PS=%d @%lu\n",
1361                        wiphy_name(local->hw.wiphy),
1362                        skb_queue_len(&sta->tx_filtered),
1363                        !!(sta->flags & WLAN_STA_PS), jiffies);
1364         dev_kfree_skb(skb);
1365 }
1366
1367 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
1368                          struct ieee80211_tx_status *status)
1369 {
1370         struct sk_buff *skb2;
1371         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1372         struct ieee80211_local *local = hw_to_local(hw);
1373         u16 frag, type;
1374         struct ieee80211_tx_status_rtap_hdr *rthdr;
1375         struct ieee80211_sub_if_data *sdata;
1376         struct net_device *prev_dev = NULL;
1377
1378         if (!status) {
1379                 printk(KERN_ERR
1380                        "%s: ieee80211_tx_status called with NULL status\n",
1381                        wiphy_name(local->hw.wiphy));
1382                 dev_kfree_skb(skb);
1383                 return;
1384         }
1385
1386         rcu_read_lock();
1387
1388         if (status->excessive_retries) {
1389                 struct sta_info *sta;
1390                 sta = sta_info_get(local, hdr->addr1);
1391                 if (sta) {
1392                         if (sta->flags & WLAN_STA_PS) {
1393                                 /*
1394                                  * The STA is in power save mode, so assume
1395                                  * that this TX packet failed because of that.
1396                                  */
1397                                 status->excessive_retries = 0;
1398                                 status->flags |= IEEE80211_TX_STATUS_TX_FILTERED;
1399                                 ieee80211_handle_filtered_frame(local, sta,
1400                                                                 skb, status);
1401                                 rcu_read_unlock();
1402                                 return;
1403                         }
1404                 }
1405         }
1406
1407         if (status->flags & IEEE80211_TX_STATUS_TX_FILTERED) {
1408                 struct sta_info *sta;
1409                 sta = sta_info_get(local, hdr->addr1);
1410                 if (sta) {
1411                         ieee80211_handle_filtered_frame(local, sta, skb,
1412                                                         status);
1413                         rcu_read_unlock();
1414                         return;
1415                 }
1416         } else
1417                 rate_control_tx_status(local->mdev, skb, status);
1418
1419         rcu_read_unlock();
1420
1421         ieee80211_led_tx(local, 0);
1422
1423         /* SNMP counters
1424          * Fragments are passed to low-level drivers as separate skbs, so these
1425          * are actually fragments, not frames. Update frame counters only for
1426          * the first fragment of the frame. */
1427
1428         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
1429         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
1430
1431         if (status->flags & IEEE80211_TX_STATUS_ACK) {
1432                 if (frag == 0) {
1433                         local->dot11TransmittedFrameCount++;
1434                         if (is_multicast_ether_addr(hdr->addr1))
1435                                 local->dot11MulticastTransmittedFrameCount++;
1436                         if (status->retry_count > 0)
1437                                 local->dot11RetryCount++;
1438                         if (status->retry_count > 1)
1439                                 local->dot11MultipleRetryCount++;
1440                 }
1441
1442                 /* This counter shall be incremented for an acknowledged MPDU
1443                  * with an individual address in the address 1 field or an MPDU
1444                  * with a multicast address in the address 1 field of type Data
1445                  * or Management. */
1446                 if (!is_multicast_ether_addr(hdr->addr1) ||
1447                     type == IEEE80211_FTYPE_DATA ||
1448                     type == IEEE80211_FTYPE_MGMT)
1449                         local->dot11TransmittedFragmentCount++;
1450         } else {
1451                 if (frag == 0)
1452                         local->dot11FailedCount++;
1453         }
1454
1455         /* this was a transmitted frame, but now we want to reuse it */
1456         skb_orphan(skb);
1457
1458         /*
1459          * This is a bit racy but we can avoid a lot of work
1460          * with this test...
1461          */
1462         if (!local->monitors && !local->cooked_mntrs) {
1463                 dev_kfree_skb(skb);
1464                 return;
1465         }
1466
1467         /* send frame to monitor interfaces now */
1468
1469         if (skb_headroom(skb) < sizeof(*rthdr)) {
1470                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
1471                 dev_kfree_skb(skb);
1472                 return;
1473         }
1474
1475         rthdr = (struct ieee80211_tx_status_rtap_hdr*)
1476                                 skb_push(skb, sizeof(*rthdr));
1477
1478         memset(rthdr, 0, sizeof(*rthdr));
1479         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1480         rthdr->hdr.it_present =
1481                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
1482                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
1483
1484         if (!(status->flags & IEEE80211_TX_STATUS_ACK) &&
1485             !is_multicast_ether_addr(hdr->addr1))
1486                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
1487
1488         if ((status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) &&
1489             (status->control.flags & IEEE80211_TXCTL_USE_CTS_PROTECT))
1490                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
1491         else if (status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS)
1492                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
1493
1494         rthdr->data_retries = status->retry_count;
1495
1496         /* XXX: is this sufficient for BPF? */
1497         skb_set_mac_header(skb, 0);
1498         skb->ip_summed = CHECKSUM_UNNECESSARY;
1499         skb->pkt_type = PACKET_OTHERHOST;
1500         skb->protocol = htons(ETH_P_802_2);
1501         memset(skb->cb, 0, sizeof(skb->cb));
1502
1503         rcu_read_lock();
1504         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1505                 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) {
1506                         if (!netif_running(sdata->dev))
1507                                 continue;
1508
1509                         if (prev_dev) {
1510                                 skb2 = skb_clone(skb, GFP_ATOMIC);
1511                                 if (skb2) {
1512                                         skb2->dev = prev_dev;
1513                                         netif_rx(skb2);
1514                                 }
1515                         }
1516
1517                         prev_dev = sdata->dev;
1518                 }
1519         }
1520         if (prev_dev) {
1521                 skb->dev = prev_dev;
1522                 netif_rx(skb);
1523                 skb = NULL;
1524         }
1525         rcu_read_unlock();
1526         dev_kfree_skb(skb);
1527 }
1528 EXPORT_SYMBOL(ieee80211_tx_status);
1529
1530 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1531                                         const struct ieee80211_ops *ops)
1532 {
1533         struct ieee80211_local *local;
1534         int priv_size;
1535         struct wiphy *wiphy;
1536
1537         /* Ensure 32-byte alignment of our private data and hw private data.
1538          * We use the wiphy priv data for both our ieee80211_local and for
1539          * the driver's private data
1540          *
1541          * In memory it'll be like this:
1542          *
1543          * +-------------------------+
1544          * | struct wiphy           |
1545          * +-------------------------+
1546          * | struct ieee80211_local  |
1547          * +-------------------------+
1548          * | driver's private data   |
1549          * +-------------------------+
1550          *
1551          */
1552         priv_size = ((sizeof(struct ieee80211_local) +
1553                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
1554                     priv_data_len;
1555
1556         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
1557
1558         if (!wiphy)
1559                 return NULL;
1560
1561         wiphy->privid = mac80211_wiphy_privid;
1562
1563         local = wiphy_priv(wiphy);
1564         local->hw.wiphy = wiphy;
1565
1566         local->hw.priv = (char *)local +
1567                          ((sizeof(struct ieee80211_local) +
1568                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
1569
1570         BUG_ON(!ops->tx);
1571         BUG_ON(!ops->start);
1572         BUG_ON(!ops->stop);
1573         BUG_ON(!ops->config);
1574         BUG_ON(!ops->add_interface);
1575         BUG_ON(!ops->remove_interface);
1576         BUG_ON(!ops->configure_filter);
1577         local->ops = ops;
1578
1579         local->hw.queues = 1; /* default */
1580
1581         local->bridge_packets = 1;
1582
1583         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
1584         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1585         local->short_retry_limit = 7;
1586         local->long_retry_limit = 4;
1587         local->hw.conf.radio_enabled = 1;
1588
1589         INIT_LIST_HEAD(&local->interfaces);
1590
1591         spin_lock_init(&local->key_lock);
1592
1593         INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1594
1595         sta_info_init(local);
1596
1597         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1598                      (unsigned long)local);
1599         tasklet_disable(&local->tx_pending_tasklet);
1600
1601         tasklet_init(&local->tasklet,
1602                      ieee80211_tasklet_handler,
1603                      (unsigned long) local);
1604         tasklet_disable(&local->tasklet);
1605
1606         skb_queue_head_init(&local->skb_queue);
1607         skb_queue_head_init(&local->skb_queue_unreliable);
1608
1609         return local_to_hw(local);
1610 }
1611 EXPORT_SYMBOL(ieee80211_alloc_hw);
1612
1613 int ieee80211_register_hw(struct ieee80211_hw *hw)
1614 {
1615         struct ieee80211_local *local = hw_to_local(hw);
1616         const char *name;
1617         int result;
1618         enum ieee80211_band band;
1619         struct net_device *mdev;
1620         struct ieee80211_sub_if_data *sdata;
1621
1622         /*
1623          * generic code guarantees at least one band,
1624          * set this very early because much code assumes
1625          * that hw.conf.channel is assigned
1626          */
1627         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1628                 struct ieee80211_supported_band *sband;
1629
1630                 sband = local->hw.wiphy->bands[band];
1631                 if (sband) {
1632                         /* init channel we're on */
1633                         local->hw.conf.channel =
1634                         local->oper_channel =
1635                         local->scan_channel = &sband->channels[0];
1636                         break;
1637                 }
1638         }
1639
1640         result = wiphy_register(local->hw.wiphy);
1641         if (result < 0)
1642                 return result;
1643
1644         /* for now, mdev needs sub_if_data :/ */
1645         mdev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
1646                             "wmaster%d", ether_setup);
1647         if (!mdev)
1648                 goto fail_mdev_alloc;
1649
1650         sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
1651         mdev->ieee80211_ptr = &sdata->wdev;
1652         sdata->wdev.wiphy = local->hw.wiphy;
1653
1654         local->mdev = mdev;
1655
1656         ieee80211_rx_bss_list_init(mdev);
1657
1658         mdev->hard_start_xmit = ieee80211_master_start_xmit;
1659         mdev->open = ieee80211_master_open;
1660         mdev->stop = ieee80211_master_stop;
1661         mdev->type = ARPHRD_IEEE80211;
1662         mdev->header_ops = &ieee80211_header_ops;
1663         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
1664
1665         sdata->vif.type = IEEE80211_IF_TYPE_AP;
1666         sdata->dev = mdev;
1667         sdata->local = local;
1668         sdata->u.ap.force_unicast_rateidx = -1;
1669         sdata->u.ap.max_ratectrl_rateidx = -1;
1670         ieee80211_if_sdata_init(sdata);
1671
1672         /* no RCU needed since we're still during init phase */
1673         list_add_tail(&sdata->list, &local->interfaces);
1674
1675         name = wiphy_dev(local->hw.wiphy)->driver->name;
1676         local->hw.workqueue = create_singlethread_workqueue(name);
1677         if (!local->hw.workqueue) {
1678                 result = -ENOMEM;
1679                 goto fail_workqueue;
1680         }
1681
1682         /*
1683          * The hardware needs headroom for sending the frame,
1684          * and we need some headroom for passing the frame to monitor
1685          * interfaces, but never both at the same time.
1686          */
1687         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1688                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
1689
1690         debugfs_hw_add(local);
1691
1692         local->hw.conf.beacon_int = 1000;
1693
1694         local->wstats_flags |= local->hw.max_rssi ?
1695                                IW_QUAL_LEVEL_UPDATED : IW_QUAL_LEVEL_INVALID;
1696         local->wstats_flags |= local->hw.max_signal ?
1697                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1698         local->wstats_flags |= local->hw.max_noise ?
1699                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1700         if (local->hw.max_rssi < 0 || local->hw.max_noise < 0)
1701                 local->wstats_flags |= IW_QUAL_DBM;
1702
1703         result = sta_info_start(local);
1704         if (result < 0)
1705                 goto fail_sta_info;
1706
1707         rtnl_lock();
1708         result = dev_alloc_name(local->mdev, local->mdev->name);
1709         if (result < 0)
1710                 goto fail_dev;
1711
1712         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1713         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1714
1715         result = register_netdevice(local->mdev);
1716         if (result < 0)
1717                 goto fail_dev;
1718
1719         ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1720         ieee80211_if_set_type(local->mdev, IEEE80211_IF_TYPE_AP);
1721
1722         result = ieee80211_init_rate_ctrl_alg(local,
1723                                               hw->rate_control_algorithm);
1724         if (result < 0) {
1725                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1726                        "algorithm\n", wiphy_name(local->hw.wiphy));
1727                 goto fail_rate;
1728         }
1729
1730         result = ieee80211_wep_init(local);
1731
1732         if (result < 0) {
1733                 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1734                        wiphy_name(local->hw.wiphy));
1735                 goto fail_wep;
1736         }
1737
1738         ieee80211_install_qdisc(local->mdev);
1739
1740         /* add one default STA interface */
1741         result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
1742                                   IEEE80211_IF_TYPE_STA, NULL);
1743         if (result)
1744                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1745                        wiphy_name(local->hw.wiphy));
1746
1747         local->reg_state = IEEE80211_DEV_REGISTERED;
1748         rtnl_unlock();
1749
1750         ieee80211_led_init(local);
1751
1752         return 0;
1753
1754 fail_wep:
1755         rate_control_deinitialize(local);
1756 fail_rate:
1757         ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1758         unregister_netdevice(local->mdev);
1759 fail_dev:
1760         rtnl_unlock();
1761         sta_info_stop(local);
1762 fail_sta_info:
1763         debugfs_hw_del(local);
1764         destroy_workqueue(local->hw.workqueue);
1765 fail_workqueue:
1766         ieee80211_if_free(local->mdev);
1767         local->mdev = NULL;
1768 fail_mdev_alloc:
1769         wiphy_unregister(local->hw.wiphy);
1770         return result;
1771 }
1772 EXPORT_SYMBOL(ieee80211_register_hw);
1773
1774 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1775 {
1776         struct ieee80211_local *local = hw_to_local(hw);
1777         struct ieee80211_sub_if_data *sdata, *tmp;
1778
1779         tasklet_kill(&local->tx_pending_tasklet);
1780         tasklet_kill(&local->tasklet);
1781
1782         rtnl_lock();
1783
1784         BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
1785
1786         local->reg_state = IEEE80211_DEV_UNREGISTERED;
1787
1788         /*
1789          * At this point, interface list manipulations are fine
1790          * because the driver cannot be handing us frames any
1791          * more and the tasklet is killed.
1792          */
1793
1794         /*
1795          * First, we remove all non-master interfaces. Do this because they
1796          * may have bss pointer dependency on the master, and when we free
1797          * the master these would be freed as well, breaking our list
1798          * iteration completely.
1799          */
1800         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1801                 if (sdata->dev == local->mdev)
1802                         continue;
1803                 list_del(&sdata->list);
1804                 __ieee80211_if_del(local, sdata);
1805         }
1806
1807         /* then, finally, remove the master interface */
1808         __ieee80211_if_del(local, IEEE80211_DEV_TO_SUB_IF(local->mdev));
1809
1810         rtnl_unlock();
1811
1812         ieee80211_rx_bss_list_deinit(local->mdev);
1813         ieee80211_clear_tx_pending(local);
1814         sta_info_stop(local);
1815         rate_control_deinitialize(local);
1816         debugfs_hw_del(local);
1817
1818         if (skb_queue_len(&local->skb_queue)
1819                         || skb_queue_len(&local->skb_queue_unreliable))
1820                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1821                        wiphy_name(local->hw.wiphy));
1822         skb_queue_purge(&local->skb_queue);
1823         skb_queue_purge(&local->skb_queue_unreliable);
1824
1825         destroy_workqueue(local->hw.workqueue);
1826         wiphy_unregister(local->hw.wiphy);
1827         ieee80211_wep_free(local);
1828         ieee80211_led_exit(local);
1829         ieee80211_if_free(local->mdev);
1830         local->mdev = NULL;
1831 }
1832 EXPORT_SYMBOL(ieee80211_unregister_hw);
1833
1834 void ieee80211_free_hw(struct ieee80211_hw *hw)
1835 {
1836         struct ieee80211_local *local = hw_to_local(hw);
1837
1838         wiphy_free(local->hw.wiphy);
1839 }
1840 EXPORT_SYMBOL(ieee80211_free_hw);
1841
1842 static int __init ieee80211_init(void)
1843 {
1844         struct sk_buff *skb;
1845         int ret;
1846
1847         BUILD_BUG_ON(sizeof(struct ieee80211_tx_packet_data) > sizeof(skb->cb));
1848
1849         ret = rc80211_pid_init();
1850         if (ret)
1851                 goto out;
1852
1853         ret = ieee80211_wme_register();
1854         if (ret) {
1855                 printk(KERN_DEBUG "ieee80211_init: failed to "
1856                        "initialize WME (err=%d)\n", ret);
1857                 goto out_cleanup_pid;
1858         }
1859
1860         ieee80211_debugfs_netdev_init();
1861
1862         return 0;
1863
1864  out_cleanup_pid:
1865         rc80211_pid_exit();
1866  out:
1867         return ret;
1868 }
1869
1870 static void __exit ieee80211_exit(void)
1871 {
1872         rc80211_pid_exit();
1873
1874         /*
1875          * For key todo, it'll be empty by now but the work
1876          * might still be scheduled.
1877          */
1878         flush_scheduled_work();
1879
1880         if (mesh_allocated)
1881                 ieee80211s_stop();
1882
1883         ieee80211_wme_unregister();
1884         ieee80211_debugfs_netdev_exit();
1885 }
1886
1887
1888 subsys_initcall(ieee80211_init);
1889 module_exit(ieee80211_exit);
1890
1891 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1892 MODULE_LICENSE("GPL");