SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/mac80211/ieee80211.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 "ieee80211_rate.h"
  29 #include "wep.h"
  30 #include "wme.h"
  31 #include "aes_ccm.h"
  32 #include "ieee80211_led.h"
  33 #include "cfg.h"
  34 #include "debugfs.h"
  35 #include "debugfs_netdev.h"
  36
  37 /*
  38  * For seeing transmitted packets on monitor interfaces
  39  * we have a radiotap header too.
  40  */
  41 struct ieee80211_tx_status_rtap_hdr {
  42         struct ieee80211_radiotap_header hdr;
  43         __le16 tx_flags;
  44         u8 data_retries;
  45 } __attribute__ ((packed));
  46
  47 /* common interface routines */
  48
  49 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
  50 {
  51         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
  52         return ETH_ALEN;
  53 }
  54
  55 /* must be called under mdev tx lock */
  56 static void ieee80211_configure_filter(struct ieee80211_local *local)
  57 {
  58         unsigned int changed_flags;
  59         unsigned int new_flags = 0;
  60
  61         if (atomic_read(&local->iff_promiscs))
  62                 new_flags |= FIF_PROMISC_IN_BSS;
  63
  64         if (atomic_read(&local->iff_allmultis))
  65                 new_flags |= FIF_ALLMULTI;
  66
  67         if (local->monitors)
  68                 new_flags |= FIF_CONTROL |
  69                              FIF_OTHER_BSS |
  70                              FIF_BCN_PRBRESP_PROMISC;
  71
  72         changed_flags = local->filter_flags ^ new_flags;
  73
  74         /* be a bit nasty */
  75         new_flags |= (1<<31);
  76
  77         local->ops->configure_filter(local_to_hw(local),
  78                                      changed_flags, &new_flags,
  79                                      local->mdev->mc_count,
  80                                      local->mdev->mc_list);
  81
  82         WARN_ON(new_flags & (1<<31));
  83
  84         local->filter_flags = new_flags & ~(1<<31);
  85 }
  86
  87 /* master interface */
  88
  89 static int ieee80211_master_open(struct net_device *dev)
  90 {
  91         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
  92         struct ieee80211_sub_if_data *sdata;
  93         int res = -EOPNOTSUPP;
  94
  95         /* we hold the RTNL here so can safely walk the list */
  96         list_for_each_entry(sdata, &local->interfaces, list) {
  97                 if (sdata->dev != dev && netif_running(sdata->dev)) {
  98                         res = 0;
  99                         break;
 100                 }
 101         }
 102         return res;
 103 }
 104
 105 static int ieee80211_master_stop(struct net_device *dev)
 106 {
 107         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 108         struct ieee80211_sub_if_data *sdata;
 109
 110         /* we hold the RTNL here so can safely walk the list */
 111         list_for_each_entry(sdata, &local->interfaces, list)
 112                 if (sdata->dev != dev && netif_running(sdata->dev))
 113                         dev_close(sdata->dev);
 114
 115         return 0;
 116 }
 117
 118 static void ieee80211_master_set_multicast_list(struct net_device *dev)
 119 {
 120         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 121
 122         ieee80211_configure_filter(local);
 123 }
 124
 125 /* regular interfaces */
 126
 127 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 128 {
 129         /* FIX: what would be proper limits for MTU?
 130          * This interface uses 802.3 frames. */
 131         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6) {
 132                 printk(KERN_WARNING "%s: invalid MTU %d\n",
 133                        dev->name, new_mtu);
 134                 return -EINVAL;
 135         }
 136
 137 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 138         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
 139 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 140         dev->mtu = new_mtu;
 141         return 0;
 142 }
 143
 144 static inline int identical_mac_addr_allowed(int type1, int type2)
 145 {
 146         return (type1 == IEEE80211_IF_TYPE_MNTR ||
 147                 type2 == IEEE80211_IF_TYPE_MNTR ||
 148                 (type1 == IEEE80211_IF_TYPE_AP &&
 149                  type2 == IEEE80211_IF_TYPE_WDS) ||
 150                 (type1 == IEEE80211_IF_TYPE_WDS &&
 151                  (type2 == IEEE80211_IF_TYPE_WDS ||
 152                   type2 == IEEE80211_IF_TYPE_AP)) ||
 153                 (type1 == IEEE80211_IF_TYPE_AP &&
 154                  type2 == IEEE80211_IF_TYPE_VLAN) ||
 155                 (type1 == IEEE80211_IF_TYPE_VLAN &&
 156                  (type2 == IEEE80211_IF_TYPE_AP ||
 157                   type2 == IEEE80211_IF_TYPE_VLAN)));
 158 }
 159
 160 static int ieee80211_open(struct net_device *dev)
 161 {
 162         struct ieee80211_sub_if_data *sdata, *nsdata;
 163         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 164         struct ieee80211_if_init_conf conf;
 165         int res;
 166
 167         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 168
 169         /* we hold the RTNL here so can safely walk the list */
 170         list_for_each_entry(nsdata, &local->interfaces, list) {
 171                 struct net_device *ndev = nsdata->dev;
 172
 173                 if (ndev != dev && ndev != local->mdev && netif_running(ndev) &&
 174                     compare_ether_addr(dev->dev_addr, ndev->dev_addr) == 0) {
 175                         /*
 176                          * check whether it may have the same address
 177                          */
 178                         if (!identical_mac_addr_allowed(sdata->type,
 179                                                         nsdata->type))
 180                                 return -ENOTUNIQ;
 181
 182                         /*
 183                          * can only add VLANs to enabled APs
 184                          */
 185                         if (sdata->type == IEEE80211_IF_TYPE_VLAN &&
 186                             nsdata->type == IEEE80211_IF_TYPE_AP &&
 187                             netif_running(nsdata->dev))
 188                                 sdata->u.vlan.ap = nsdata;
 189                 }
 190         }
 191
 192         switch (sdata->type) {
 193         case IEEE80211_IF_TYPE_WDS:
 194                 if (is_zero_ether_addr(sdata->u.wds.remote_addr))
 195                         return -ENOLINK;
 196                 break;
 197         case IEEE80211_IF_TYPE_VLAN:
 198                 if (!sdata->u.vlan.ap)
 199                         return -ENOLINK;
 200                 break;
 201         case IEEE80211_IF_TYPE_AP:
 202         case IEEE80211_IF_TYPE_STA:
 203         case IEEE80211_IF_TYPE_MNTR:
 204         case IEEE80211_IF_TYPE_IBSS:
 205                 /* no special treatment */
 206                 break;
 207         case IEEE80211_IF_TYPE_INVALID:
 208                 /* cannot happen */
 209                 WARN_ON(1);
 210                 break;
 211         }
 212
 213         if (local->open_count == 0) {
 214                 res = 0;
 215                 if (local->ops->start)
 216                         res = local->ops->start(local_to_hw(local));
 217                 if (res)
 218                         return res;
 219                 ieee80211_hw_config(local);
 220         }
 221
 222         switch (sdata->type) {
 223         case IEEE80211_IF_TYPE_VLAN:
 224                 list_add(&sdata->u.vlan.list, &sdata->u.vlan.ap->u.ap.vlans);
 225                 /* no need to tell driver */
 226                 break;
 227         case IEEE80211_IF_TYPE_MNTR:
 228                 /* must be before the call to ieee80211_configure_filter */
 229                 local->monitors++;
 230                 if (local->monitors == 1) {
 231                         netif_tx_lock_bh(local->mdev);
 232                         ieee80211_configure_filter(local);
 233                         netif_tx_unlock_bh(local->mdev);
 234
 235                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 236                 }
 237                 break;
 238         case IEEE80211_IF_TYPE_STA:
 239         case IEEE80211_IF_TYPE_IBSS:
 240                 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
 241                 /* fall through */
 242         default:
 243                 conf.if_id = dev->ifindex;
 244                 conf.type = sdata->type;
 245                 conf.mac_addr = dev->dev_addr;
 246                 res = local->ops->add_interface(local_to_hw(local), &conf);
 247                 if (res && !local->open_count && local->ops->stop)
 248                         local->ops->stop(local_to_hw(local));
 249                 if (res)
 250                         return res;
 251
 252                 ieee80211_if_config(dev);
 253                 ieee80211_reset_erp_info(dev);
 254                 ieee80211_enable_keys(sdata);
 255
 256                 if (sdata->type == IEEE80211_IF_TYPE_STA &&
 257                     !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
 258                         netif_carrier_off(dev);
 259                 else
 260                         netif_carrier_on(dev);
 261         }
 262
 263         if (local->open_count == 0) {
 264                 res = dev_open(local->mdev);
 265                 WARN_ON(res);
 266                 tasklet_enable(&local->tx_pending_tasklet);
 267                 tasklet_enable(&local->tasklet);
 268         }
 269
 270         local->open_count++;
 271
 272         netif_start_queue(dev);
 273
 274         return 0;
 275 }
 276
 277 static int ieee80211_stop(struct net_device *dev)
 278 {
 279         struct ieee80211_sub_if_data *sdata;
 280         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 281         struct ieee80211_if_init_conf conf;
 282
 283         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 284
 285         netif_stop_queue(dev);
 286
 287         dev_mc_unsync(local->mdev, dev);
 288
 289         /* down all dependent devices, that is VLANs */
 290         if (sdata->type == IEEE80211_IF_TYPE_AP) {
 291                 struct ieee80211_sub_if_data *vlan, *tmp;
 292
 293                 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
 294                                          u.vlan.list)
 295                         dev_close(vlan->dev);
 296                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 297         }
 298
 299         local->open_count--;
 300
 301         switch (sdata->type) {
 302         case IEEE80211_IF_TYPE_VLAN:
 303                 list_del(&sdata->u.vlan.list);
 304                 sdata->u.vlan.ap = NULL;
 305                 /* no need to tell driver */
 306                 break;
 307         case IEEE80211_IF_TYPE_MNTR:
 308                 local->monitors--;
 309                 if (local->monitors == 0) {
 310                         netif_tx_lock_bh(local->mdev);
 311                         ieee80211_configure_filter(local);
 312                         netif_tx_unlock_bh(local->mdev);
 313
 314                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
 315                 }
 316                 break;
 317         case IEEE80211_IF_TYPE_STA:
 318         case IEEE80211_IF_TYPE_IBSS:
 319                 sdata->u.sta.state = IEEE80211_DISABLED;
 320                 del_timer_sync(&sdata->u.sta.timer);
 321                 /*
 322                  * When we get here, the interface is marked down.
 323                  * Call synchronize_rcu() to wait for the RX path
 324                  * should it be using the interface and enqueuing
 325                  * frames at this very time on another CPU.
 326                  */
 327                 synchronize_rcu();
 328                 skb_queue_purge(&sdata->u.sta.skb_queue);
 329
 330                 if (!local->ops->hw_scan &&
 331                     local->scan_dev == sdata->dev) {
 332                         local->sta_scanning = 0;
 333                         cancel_delayed_work(&local->scan_work);
 334                 }
 335                 flush_workqueue(local->hw.workqueue);
 336
 337                 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
 338                 kfree(sdata->u.sta.extra_ie);
 339                 sdata->u.sta.extra_ie = NULL;
 340                 sdata->u.sta.extra_ie_len = 0;
 341                 /* fall through */
 342         default:
 343                 conf.if_id = dev->ifindex;
 344                 conf.type = sdata->type;
 345                 conf.mac_addr = dev->dev_addr;
 346                 /* disable all keys for as long as this netdev is down */
 347                 ieee80211_disable_keys(sdata);
 348                 local->ops->remove_interface(local_to_hw(local), &conf);
 349         }
 350
 351         if (local->open_count == 0) {
 352                 if (netif_running(local->mdev))
 353                         dev_close(local->mdev);
 354
 355                 if (local->ops->stop)
 356                         local->ops->stop(local_to_hw(local));
 357
 358                 tasklet_disable(&local->tx_pending_tasklet);
 359                 tasklet_disable(&local->tasklet);
 360         }
 361
 362         return 0;
 363 }
 364
 365 static void ieee80211_set_multicast_list(struct net_device *dev)
 366 {
 367         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 368         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 369         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 370
 371         allmulti = !!(dev->flags & IFF_ALLMULTI);
 372         promisc = !!(dev->flags & IFF_PROMISC);
 373         sdata_allmulti = sdata->flags & IEEE80211_SDATA_ALLMULTI;
 374         sdata_promisc = sdata->flags & IEEE80211_SDATA_PROMISC;
 375
 376         if (allmulti != sdata_allmulti) {
 377                 if (dev->flags & IFF_ALLMULTI)
 378                         atomic_inc(&local->iff_allmultis);
 379                 else
 380                         atomic_dec(&local->iff_allmultis);
 381                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 382         }
 383
 384         if (promisc != sdata_promisc) {
 385                 if (dev->flags & IFF_PROMISC)
 386                         atomic_inc(&local->iff_promiscs);
 387                 else
 388                         atomic_dec(&local->iff_promiscs);
 389                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 390         }
 391
 392         dev_mc_sync(local->mdev, dev);
 393 }
 394
 395 static const struct header_ops ieee80211_header_ops = {
 396         .create         = eth_header,
 397         .parse          = header_parse_80211,
 398         .rebuild        = eth_rebuild_header,
 399         .cache          = eth_header_cache,
 400         .cache_update   = eth_header_cache_update,
 401 };
 402
 403 /* Must not be called for mdev */
 404 void ieee80211_if_setup(struct net_device *dev)
 405 {
 406         ether_setup(dev);
 407         dev->header_ops = &ieee80211_header_ops;
 408         dev->hard_start_xmit = ieee80211_subif_start_xmit;
 409         dev->wireless_handlers = &ieee80211_iw_handler_def;
 410         dev->set_multicast_list = ieee80211_set_multicast_list;
 411         dev->change_mtu = ieee80211_change_mtu;
 412         dev->open = ieee80211_open;
 413         dev->stop = ieee80211_stop;
 414         dev->destructor = ieee80211_if_free;
 415 }
 416
 417 /* WDS specialties */
 418
 419 int ieee80211_if_update_wds(struct net_device *dev, u8 *remote_addr)
 420 {
 421         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 422         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 423         struct sta_info *sta;
 424         DECLARE_MAC_BUF(mac);
 425
 426         if (compare_ether_addr(remote_addr, sdata->u.wds.remote_addr) == 0)
 427                 return 0;
 428
 429         /* Create STA entry for the new peer */
 430         sta = sta_info_add(local, dev, remote_addr, GFP_KERNEL);
 431         if (!sta)
 432                 return -ENOMEM;
 433         sta_info_put(sta);
 434
 435         /* Remove STA entry for the old peer */
 436         sta = sta_info_get(local, sdata->u.wds.remote_addr);
 437         if (sta) {
 438                 sta_info_free(sta);
 439                 sta_info_put(sta);
 440         } else {
 441                 printk(KERN_DEBUG "%s: could not find STA entry for WDS link "
 442                        "peer %s\n",
 443                        dev->name, print_mac(mac, sdata->u.wds.remote_addr));
 444         }
 445
 446         /* Update WDS link data */
 447         memcpy(&sdata->u.wds.remote_addr, remote_addr, ETH_ALEN);
 448
 449         return 0;
 450 }
 451
 452 /* everything else */
 453
 454 static int __ieee80211_if_config(struct net_device *dev,
 455                                  struct sk_buff *beacon,
 456                                  struct ieee80211_tx_control *control)
 457 {
 458         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 459         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 460         struct ieee80211_if_conf conf;
 461
 462         if (!local->ops->config_interface || !netif_running(dev))
 463                 return 0;
 464
 465         memset(&conf, 0, sizeof(conf));
 466         conf.type = sdata->type;
 467         if (sdata->type == IEEE80211_IF_TYPE_STA ||
 468             sdata->type == IEEE80211_IF_TYPE_IBSS) {
 469                 conf.bssid = sdata->u.sta.bssid;
 470                 conf.ssid = sdata->u.sta.ssid;
 471                 conf.ssid_len = sdata->u.sta.ssid_len;
 472         } else if (sdata->type == IEEE80211_IF_TYPE_AP) {
 473                 conf.ssid = sdata->u.ap.ssid;
 474                 conf.ssid_len = sdata->u.ap.ssid_len;
 475                 conf.beacon = beacon;
 476                 conf.beacon_control = control;
 477         }
 478         return local->ops->config_interface(local_to_hw(local),
 479                                            dev->ifindex, &conf);
 480 }
 481
 482 int ieee80211_if_config(struct net_device *dev)
 483 {
 484         return __ieee80211_if_config(dev, NULL, NULL);
 485 }
 486
 487 int ieee80211_if_config_beacon(struct net_device *dev)
 488 {
 489         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 490         struct ieee80211_tx_control control;
 491         struct sk_buff *skb;
 492
 493         if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
 494                 return 0;
 495         skb = ieee80211_beacon_get(local_to_hw(local), dev->ifindex, &control);
 496         if (!skb)
 497                 return -ENOMEM;
 498         return __ieee80211_if_config(dev, skb, &control);
 499 }
 500
 501 int ieee80211_hw_config(struct ieee80211_local *local)
 502 {
 503         struct ieee80211_hw_mode *mode;
 504         struct ieee80211_channel *chan;
 505         int ret = 0;
 506
 507         if (local->sta_scanning) {
 508                 chan = local->scan_channel;
 509                 mode = local->scan_hw_mode;
 510         } else {
 511                 chan = local->oper_channel;
 512                 mode = local->oper_hw_mode;
 513         }
 514
 515         local->hw.conf.channel = chan->chan;
 516         local->hw.conf.channel_val = chan->val;
 517         if (!local->hw.conf.power_level) {
 518                 local->hw.conf.power_level = chan->power_level;
 519         } else {
 520                 local->hw.conf.power_level = min(chan->power_level,
 521                                                  local->hw.conf.power_level);
 522         }
 523         local->hw.conf.freq = chan->freq;
 524         local->hw.conf.phymode = mode->mode;
 525         local->hw.conf.antenna_max = chan->antenna_max;
 526         local->hw.conf.chan = chan;
 527         local->hw.conf.mode = mode;
 528
 529 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 530         printk(KERN_DEBUG "HW CONFIG: channel=%d freq=%d "
 531                "phymode=%d\n", local->hw.conf.channel, local->hw.conf.freq,
 532                local->hw.conf.phymode);
 533 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 534
 535         if (local->open_count)
 536                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
 537
 538         return ret;
 539 }
 540
 541 void ieee80211_erp_info_change_notify(struct net_device *dev, u8 changes)
 542 {
 543         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 544         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 545         if (local->ops->erp_ie_changed)
 546                 local->ops->erp_ie_changed(local_to_hw(local), changes,
 547                         !!(sdata->flags & IEEE80211_SDATA_USE_PROTECTION),
 548                         !(sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE));
 549 }
 550
 551 void ieee80211_reset_erp_info(struct net_device *dev)
 552 {
 553         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 554
 555         sdata->flags &= ~(IEEE80211_SDATA_USE_PROTECTION |
 556                         IEEE80211_SDATA_SHORT_PREAMBLE);
 557         ieee80211_erp_info_change_notify(dev,
 558                                          IEEE80211_ERP_CHANGE_PROTECTION |
 559                                          IEEE80211_ERP_CHANGE_PREAMBLE);
 560 }
 561
 562 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 563                                  struct sk_buff *skb,
 564                                  struct ieee80211_tx_status *status)
 565 {
 566         struct ieee80211_local *local = hw_to_local(hw);
 567         struct ieee80211_tx_status *saved;
 568         int tmp;
 569
 570         skb->dev = local->mdev;
 571         saved = kmalloc(sizeof(struct ieee80211_tx_status), GFP_ATOMIC);
 572         if (unlikely(!saved)) {
 573                 if (net_ratelimit())
 574                         printk(KERN_WARNING "%s: Not enough memory, "
 575                                "dropping tx status", skb->dev->name);
 576                 /* should be dev_kfree_skb_irq, but due to this function being
 577                  * named _irqsafe instead of just _irq we can't be sure that
 578                  * people won't call it from non-irq contexts */
 579                 dev_kfree_skb_any(skb);
 580                 return;
 581         }
 582         memcpy(saved, status, sizeof(struct ieee80211_tx_status));
 583         /* copy pointer to saved status into skb->cb for use by tasklet */
 584         memcpy(skb->cb, &saved, sizeof(saved));
 585
 586         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 587         skb_queue_tail(status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS ?
 588                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 589         tmp = skb_queue_len(&local->skb_queue) +
 590                 skb_queue_len(&local->skb_queue_unreliable);
 591         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 592                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 593                 memcpy(&saved, skb->cb, sizeof(saved));
 594                 kfree(saved);
 595                 dev_kfree_skb_irq(skb);
 596                 tmp--;
 597                 I802_DEBUG_INC(local->tx_status_drop);
 598         }
 599         tasklet_schedule(&local->tasklet);
 600 }
 601 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 602
 603 static void ieee80211_tasklet_handler(unsigned long data)
 604 {
 605         struct ieee80211_local *local = (struct ieee80211_local *) data;
 606         struct sk_buff *skb;
 607         struct ieee80211_rx_status rx_status;
 608         struct ieee80211_tx_status *tx_status;
 609
 610         while ((skb = skb_dequeue(&local->skb_queue)) ||
 611                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 612                 switch (skb->pkt_type) {
 613                 case IEEE80211_RX_MSG:
 614                         /* status is in skb->cb */
 615                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 616                         /* Clear skb->type in order to not confuse kernel
 617                          * netstack. */
 618                         skb->pkt_type = 0;
 619                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 620                         break;
 621                 case IEEE80211_TX_STATUS_MSG:
 622                         /* get pointer to saved status out of skb->cb */
 623                         memcpy(&tx_status, skb->cb, sizeof(tx_status));
 624                         skb->pkt_type = 0;
 625                         ieee80211_tx_status(local_to_hw(local),
 626                                             skb, tx_status);
 627                         kfree(tx_status);
 628                         break;
 629                 default: /* should never get here! */
 630                         printk(KERN_ERR "%s: Unknown message type (%d)\n",
 631                                wiphy_name(local->hw.wiphy), skb->pkt_type);
 632                         dev_kfree_skb(skb);
 633                         break;
 634                 }
 635         }
 636 }
 637
 638 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 639  * make a prepared TX frame (one that has been given to hw) to look like brand
 640  * new IEEE 802.11 frame that is ready to go through TX processing again.
 641  * Also, tx_packet_data in cb is restored from tx_control. */
 642 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 643                                       struct ieee80211_key *key,
 644                                       struct sk_buff *skb,
 645                                       struct ieee80211_tx_control *control)
 646 {
 647         int hdrlen, iv_len, mic_len;
 648         struct ieee80211_tx_packet_data *pkt_data;
 649
 650         pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
 651         pkt_data->ifindex = control->ifindex;
 652         pkt_data->flags = 0;
 653         if (control->flags & IEEE80211_TXCTL_REQ_TX_STATUS)
 654                 pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
 655         if (control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT)
 656                 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
 657         if (control->flags & IEEE80211_TXCTL_REQUEUE)
 658                 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
 659         pkt_data->queue = control->queue;
 660
 661         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 662
 663         if (!key)
 664                 goto no_key;
 665
 666         switch (key->conf.alg) {
 667         case ALG_WEP:
 668                 iv_len = WEP_IV_LEN;
 669                 mic_len = WEP_ICV_LEN;
 670                 break;
 671         case ALG_TKIP:
 672                 iv_len = TKIP_IV_LEN;
 673                 mic_len = TKIP_ICV_LEN;
 674                 break;
 675         case ALG_CCMP:
 676                 iv_len = CCMP_HDR_LEN;
 677                 mic_len = CCMP_MIC_LEN;
 678                 break;
 679         default:
 680                 goto no_key;
 681         }
 682
 683         if (skb->len >= mic_len &&
 684             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 685                 skb_trim(skb, skb->len - mic_len);
 686         if (skb->len >= iv_len && skb->len > hdrlen) {
 687                 memmove(skb->data + iv_len, skb->data, hdrlen);
 688                 skb_pull(skb, iv_len);
 689         }
 690
 691 no_key:
 692         {
 693                 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 694                 u16 fc = le16_to_cpu(hdr->frame_control);
 695                 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
 696                         fc &= ~IEEE80211_STYPE_QOS_DATA;
 697                         hdr->frame_control = cpu_to_le16(fc);
 698                         memmove(skb->data + 2, skb->data, hdrlen - 2);
 699                         skb_pull(skb, 2);
 700                 }
 701         }
 702 }
 703
 704 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
 705                          struct ieee80211_tx_status *status)
 706 {
 707         struct sk_buff *skb2;
 708         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 709         struct ieee80211_local *local = hw_to_local(hw);
 710         u16 frag, type;
 711         struct ieee80211_tx_status_rtap_hdr *rthdr;
 712         struct ieee80211_sub_if_data *sdata;
 713         int monitors;
 714
 715         if (!status) {
 716                 printk(KERN_ERR
 717                        "%s: ieee80211_tx_status called with NULL status\n",
 718                        wiphy_name(local->hw.wiphy));
 719                 dev_kfree_skb(skb);
 720                 return;
 721         }
 722
 723         if (status->excessive_retries) {
 724                 struct sta_info *sta;
 725                 sta = sta_info_get(local, hdr->addr1);
 726                 if (sta) {
 727                         if (sta->flags & WLAN_STA_PS) {
 728                                 /* The STA is in power save mode, so assume
 729                                  * that this TX packet failed because of that.
 730                                  */
 731                                 status->excessive_retries = 0;
 732                                 status->flags |= IEEE80211_TX_STATUS_TX_FILTERED;
 733                         }
 734                         sta_info_put(sta);
 735                 }
 736         }
 737
 738         if (status->flags & IEEE80211_TX_STATUS_TX_FILTERED) {
 739                 struct sta_info *sta;
 740                 sta = sta_info_get(local, hdr->addr1);
 741                 if (sta) {
 742                         sta->tx_filtered_count++;
 743
 744                         /* Clear the TX filter mask for this STA when sending
 745                          * the next packet. If the STA went to power save mode,
 746                          * this will happen when it is waking up for the next
 747                          * time. */
 748                         sta->clear_dst_mask = 1;
 749
 750                         /* TODO: Is the WLAN_STA_PS flag always set here or is
 751                          * the race between RX and TX status causing some
 752                          * packets to be filtered out before 80211.o gets an
 753                          * update for PS status? This seems to be the case, so
 754                          * no changes are likely to be needed. */
 755                         if (sta->flags & WLAN_STA_PS &&
 756                             skb_queue_len(&sta->tx_filtered) <
 757                             STA_MAX_TX_BUFFER) {
 758                                 ieee80211_remove_tx_extra(local, sta->key,
 759                                                           skb,
 760                                                           &status->control);
 761                                 skb_queue_tail(&sta->tx_filtered, skb);
 762                         } else if (!(sta->flags & WLAN_STA_PS) &&
 763                                    !(status->control.flags & IEEE80211_TXCTL_REQUEUE)) {
 764                                 /* Software retry the packet once */
 765                                 status->control.flags |= IEEE80211_TXCTL_REQUEUE;
 766                                 ieee80211_remove_tx_extra(local, sta->key,
 767                                                           skb,
 768                                                           &status->control);
 769                                 dev_queue_xmit(skb);
 770                         } else {
 771                                 if (net_ratelimit()) {
 772                                         printk(KERN_DEBUG "%s: dropped TX "
 773                                                "filtered frame queue_len=%d "
 774                                                "PS=%d @%lu\n",
 775                                                wiphy_name(local->hw.wiphy),
 776                                                skb_queue_len(
 777                                                        &sta->tx_filtered),
 778                                                !!(sta->flags & WLAN_STA_PS),
 779                                                jiffies);
 780                                 }
 781                                 dev_kfree_skb(skb);
 782                         }
 783                         sta_info_put(sta);
 784                         return;
 785                 }
 786         } else {
 787                 /* FIXME: STUPID to call this with both local and local->mdev */
 788                 rate_control_tx_status(local, local->mdev, skb, status);
 789         }
 790
 791         ieee80211_led_tx(local, 0);
 792
 793         /* SNMP counters
 794          * Fragments are passed to low-level drivers as separate skbs, so these
 795          * are actually fragments, not frames. Update frame counters only for
 796          * the first fragment of the frame. */
 797
 798         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 799         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 800
 801         if (status->flags & IEEE80211_TX_STATUS_ACK) {
 802                 if (frag == 0) {
 803                         local->dot11TransmittedFrameCount++;
 804                         if (is_multicast_ether_addr(hdr->addr1))
 805                                 local->dot11MulticastTransmittedFrameCount++;
 806                         if (status->retry_count > 0)
 807                                 local->dot11RetryCount++;
 808                         if (status->retry_count > 1)
 809                                 local->dot11MultipleRetryCount++;
 810                 }
 811
 812                 /* This counter shall be incremented for an acknowledged MPDU
 813                  * with an individual address in the address 1 field or an MPDU
 814                  * with a multicast address in the address 1 field of type Data
 815                  * or Management. */
 816                 if (!is_multicast_ether_addr(hdr->addr1) ||
 817                     type == IEEE80211_FTYPE_DATA ||
 818                     type == IEEE80211_FTYPE_MGMT)
 819                         local->dot11TransmittedFragmentCount++;
 820         } else {
 821                 if (frag == 0)
 822                         local->dot11FailedCount++;
 823         }
 824
 825         /* this was a transmitted frame, but now we want to reuse it */
 826         skb_orphan(skb);
 827
 828         if (!local->monitors) {
 829                 dev_kfree_skb(skb);
 830                 return;
 831         }
 832
 833         /* send frame to monitor interfaces now */
 834
 835         if (skb_headroom(skb) < sizeof(*rthdr)) {
 836                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 837                 dev_kfree_skb(skb);
 838                 return;
 839         }
 840
 841         rthdr = (struct ieee80211_tx_status_rtap_hdr*)
 842                                 skb_push(skb, sizeof(*rthdr));
 843
 844         memset(rthdr, 0, sizeof(*rthdr));
 845         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 846         rthdr->hdr.it_present =
 847                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 848                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
 849
 850         if (!(status->flags & IEEE80211_TX_STATUS_ACK) &&
 851             !is_multicast_ether_addr(hdr->addr1))
 852                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 853
 854         if ((status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) &&
 855             (status->control.flags & IEEE80211_TXCTL_USE_CTS_PROTECT))
 856                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 857         else if (status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS)
 858                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 859
 860         rthdr->data_retries = status->retry_count;
 861
 862         rcu_read_lock();
 863         monitors = local->monitors;
 864         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 865                 /*
 866                  * Using the monitors counter is possibly racy, but
 867                  * if the value is wrong we simply either clone the skb
 868                  * once too much or forget sending it to one monitor iface
 869                  * The latter case isn't nice but fixing the race is much
 870                  * more complicated.
 871                  */
 872                 if (!monitors || !skb)
 873                         goto out;
 874
 875                 if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
 876                         if (!netif_running(sdata->dev))
 877                                 continue;
 878                         monitors--;
 879                         if (monitors)
 880                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 881                         else
 882                                 skb2 = NULL;
 883                         skb->dev = sdata->dev;
 884                         /* XXX: is this sufficient for BPF? */
 885                         skb_set_mac_header(skb, 0);
 886                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 887                         skb->pkt_type = PACKET_OTHERHOST;
 888                         skb->protocol = htons(ETH_P_802_2);
 889                         memset(skb->cb, 0, sizeof(skb->cb));
 890                         netif_rx(skb);
 891                         skb = skb2;
 892                 }
 893         }
 894  out:
 895         rcu_read_unlock();
 896         if (skb)
 897                 dev_kfree_skb(skb);
 898 }
 899 EXPORT_SYMBOL(ieee80211_tx_status);
 900
 901 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 902                                         const struct ieee80211_ops *ops)
 903 {
 904         struct net_device *mdev;
 905         struct ieee80211_local *local;
 906         struct ieee80211_sub_if_data *sdata;
 907         int priv_size;
 908         struct wiphy *wiphy;
 909
 910         /* Ensure 32-byte alignment of our private data and hw private data.
 911          * We use the wiphy priv data for both our ieee80211_local and for
 912          * the driver's private data
 913          *
 914          * In memory it'll be like this:
 915          *
 916          * +-------------------------+
 917          * | struct wiphy           |
 918          * +-------------------------+
 919          * | struct ieee80211_local  |
 920          * +-------------------------+
 921          * | driver's private data   |
 922          * +-------------------------+
 923          *
 924          */
 925         priv_size = ((sizeof(struct ieee80211_local) +
 926                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
 927                     priv_data_len;
 928
 929         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 930
 931         if (!wiphy)
 932                 return NULL;
 933
 934         wiphy->privid = mac80211_wiphy_privid;
 935
 936         local = wiphy_priv(wiphy);
 937         local->hw.wiphy = wiphy;
 938
 939         local->hw.priv = (char *)local +
 940                          ((sizeof(struct ieee80211_local) +
 941                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
 942
 943         BUG_ON(!ops->tx);
 944         BUG_ON(!ops->start);
 945         BUG_ON(!ops->stop);
 946         BUG_ON(!ops->config);
 947         BUG_ON(!ops->add_interface);
 948         BUG_ON(!ops->remove_interface);
 949         BUG_ON(!ops->configure_filter);
 950         local->ops = ops;
 951
 952         /* for now, mdev needs sub_if_data :/ */
 953         mdev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
 954                             "wmaster%d", ether_setup);
 955         if (!mdev) {
 956                 wiphy_free(wiphy);
 957                 return NULL;
 958         }
 959
 960         sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
 961         mdev->ieee80211_ptr = &sdata->wdev;
 962         sdata->wdev.wiphy = wiphy;
 963
 964         local->hw.queues = 1; /* default */
 965
 966         local->mdev = mdev;
 967         local->rx_pre_handlers = ieee80211_rx_pre_handlers;
 968         local->rx_handlers = ieee80211_rx_handlers;
 969         local->tx_handlers = ieee80211_tx_handlers;
 970
 971         local->bridge_packets = 1;
 972
 973         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
 974         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
 975         local->short_retry_limit = 7;
 976         local->long_retry_limit = 4;
 977         local->hw.conf.radio_enabled = 1;
 978
 979         local->enabled_modes = ~0;
 980
 981         INIT_LIST_HEAD(&local->modes_list);
 982
 983         INIT_LIST_HEAD(&local->interfaces);
 984
 985         INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
 986         ieee80211_rx_bss_list_init(mdev);
 987
 988         sta_info_init(local);
 989
 990         mdev->hard_start_xmit = ieee80211_master_start_xmit;
 991         mdev->open = ieee80211_master_open;
 992         mdev->stop = ieee80211_master_stop;
 993         mdev->type = ARPHRD_IEEE80211;
 994         mdev->header_ops = &ieee80211_header_ops;
 995         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
 996
 997         sdata->type = IEEE80211_IF_TYPE_AP;
 998         sdata->dev = mdev;
 999         sdata->local = local;
1000         sdata->u.ap.force_unicast_rateidx = -1;
1001         sdata->u.ap.max_ratectrl_rateidx = -1;
1002         ieee80211_if_sdata_init(sdata);
1003         /* no RCU needed since we're still during init phase */
1004         list_add_tail(&sdata->list, &local->interfaces);
1005
1006         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1007                      (unsigned long)local);
1008         tasklet_disable(&local->tx_pending_tasklet);
1009
1010         tasklet_init(&local->tasklet,
1011                      ieee80211_tasklet_handler,
1012                      (unsigned long) local);
1013         tasklet_disable(&local->tasklet);
1014
1015         skb_queue_head_init(&local->skb_queue);
1016         skb_queue_head_init(&local->skb_queue_unreliable);
1017
1018         return local_to_hw(local);
1019 }
1020 EXPORT_SYMBOL(ieee80211_alloc_hw);
1021
1022 int ieee80211_register_hw(struct ieee80211_hw *hw)
1023 {
1024         struct ieee80211_local *local = hw_to_local(hw);
1025         const char *name;
1026         int result;
1027
1028         result = wiphy_register(local->hw.wiphy);
1029         if (result < 0)
1030                 return result;
1031
1032         name = wiphy_dev(local->hw.wiphy)->driver->name;
1033         local->hw.workqueue = create_singlethread_workqueue(name);
1034         if (!local->hw.workqueue) {
1035                 result = -ENOMEM;
1036                 goto fail_workqueue;
1037         }
1038
1039         /*
1040          * The hardware needs headroom for sending the frame,
1041          * and we need some headroom for passing the frame to monitor
1042          * interfaces, but never both at the same time.
1043          */
1044         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1045                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
1046
1047         debugfs_hw_add(local);
1048
1049         local->hw.conf.beacon_int = 1000;
1050
1051         local->wstats_flags |= local->hw.max_rssi ?
1052                                IW_QUAL_LEVEL_UPDATED : IW_QUAL_LEVEL_INVALID;
1053         local->wstats_flags |= local->hw.max_signal ?
1054                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1055         local->wstats_flags |= local->hw.max_noise ?
1056                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1057         if (local->hw.max_rssi < 0 || local->hw.max_noise < 0)
1058                 local->wstats_flags |= IW_QUAL_DBM;
1059
1060         result = sta_info_start(local);
1061         if (result < 0)
1062                 goto fail_sta_info;
1063
1064         rtnl_lock();
1065         result = dev_alloc_name(local->mdev, local->mdev->name);
1066         if (result < 0)
1067                 goto fail_dev;
1068
1069         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1070         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1071
1072         result = register_netdevice(local->mdev);
1073         if (result < 0)
1074                 goto fail_dev;
1075
1076         ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1077         ieee80211_if_set_type(local->mdev, IEEE80211_IF_TYPE_AP);
1078
1079         result = ieee80211_init_rate_ctrl_alg(local,
1080                                               hw->rate_control_algorithm);
1081         if (result < 0) {
1082                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1083                        "algorithm\n", wiphy_name(local->hw.wiphy));
1084                 goto fail_rate;
1085         }
1086
1087         result = ieee80211_wep_init(local);
1088
1089         if (result < 0) {
1090                 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1091                        wiphy_name(local->hw.wiphy));
1092                 goto fail_wep;
1093         }
1094
1095         ieee80211_install_qdisc(local->mdev);
1096
1097         /* add one default STA interface */
1098         result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
1099                                   IEEE80211_IF_TYPE_STA);
1100         if (result)
1101                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1102                        wiphy_name(local->hw.wiphy));
1103
1104         local->reg_state = IEEE80211_DEV_REGISTERED;
1105         rtnl_unlock();
1106
1107         ieee80211_led_init(local);
1108
1109         return 0;
1110
1111 fail_wep:
1112         rate_control_deinitialize(local);
1113 fail_rate:
1114         ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1115         unregister_netdevice(local->mdev);
1116 fail_dev:
1117         rtnl_unlock();
1118         sta_info_stop(local);
1119 fail_sta_info:
1120         debugfs_hw_del(local);
1121         destroy_workqueue(local->hw.workqueue);
1122 fail_workqueue:
1123         wiphy_unregister(local->hw.wiphy);
1124         return result;
1125 }
1126 EXPORT_SYMBOL(ieee80211_register_hw);
1127
1128 int ieee80211_register_hwmode(struct ieee80211_hw *hw,
1129                               struct ieee80211_hw_mode *mode)
1130 {
1131         struct ieee80211_local *local = hw_to_local(hw);
1132         struct ieee80211_rate *rate;
1133         int i;
1134
1135         INIT_LIST_HEAD(&mode->list);
1136         list_add_tail(&mode->list, &local->modes_list);
1137
1138         local->hw_modes |= (1 << mode->mode);
1139         for (i = 0; i < mode->num_rates; i++) {
1140                 rate = &(mode->rates[i]);
1141                 rate->rate_inv = CHAN_UTIL_RATE_LCM / rate->rate;
1142         }
1143         ieee80211_prepare_rates(local, mode);
1144
1145         if (!local->oper_hw_mode) {
1146                 /* Default to this mode */
1147                 local->hw.conf.phymode = mode->mode;
1148                 local->oper_hw_mode = local->scan_hw_mode = mode;
1149                 local->oper_channel = local->scan_channel = &mode->channels[0];
1150                 local->hw.conf.mode = local->oper_hw_mode;
1151                 local->hw.conf.chan = local->oper_channel;
1152         }
1153
1154         if (!(hw->flags & IEEE80211_HW_DEFAULT_REG_DOMAIN_CONFIGURED))
1155                 ieee80211_set_default_regdomain(mode);
1156
1157         return 0;
1158 }
1159 EXPORT_SYMBOL(ieee80211_register_hwmode);
1160
1161 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1162 {
1163         struct ieee80211_local *local = hw_to_local(hw);
1164         struct ieee80211_sub_if_data *sdata, *tmp;
1165         int i;
1166
1167         tasklet_kill(&local->tx_pending_tasklet);
1168         tasklet_kill(&local->tasklet);
1169
1170         rtnl_lock();
1171
1172         BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
1173
1174         local->reg_state = IEEE80211_DEV_UNREGISTERED;
1175
1176         /*
1177          * At this point, interface list manipulations are fine
1178          * because the driver cannot be handing us frames any
1179          * more and the tasklet is killed.
1180          */
1181
1182         /*
1183          * First, we remove all non-master interfaces. Do this because they
1184          * may have bss pointer dependency on the master, and when we free
1185          * the master these would be freed as well, breaking our list
1186          * iteration completely.
1187          */
1188         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1189                 if (sdata->dev == local->mdev)
1190                         continue;
1191                 list_del(&sdata->list);
1192                 __ieee80211_if_del(local, sdata);
1193         }
1194
1195         /* then, finally, remove the master interface */
1196         __ieee80211_if_del(local, IEEE80211_DEV_TO_SUB_IF(local->mdev));
1197
1198         rtnl_unlock();
1199
1200         ieee80211_rx_bss_list_deinit(local->mdev);
1201         ieee80211_clear_tx_pending(local);
1202         sta_info_stop(local);
1203         rate_control_deinitialize(local);
1204         debugfs_hw_del(local);
1205
1206         for (i = 0; i < NUM_IEEE80211_MODES; i++) {
1207                 kfree(local->supp_rates[i]);
1208                 kfree(local->basic_rates[i]);
1209         }
1210
1211         if (skb_queue_len(&local->skb_queue)
1212                         || skb_queue_len(&local->skb_queue_unreliable))
1213                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1214                        wiphy_name(local->hw.wiphy));
1215         skb_queue_purge(&local->skb_queue);
1216         skb_queue_purge(&local->skb_queue_unreliable);
1217
1218         destroy_workqueue(local->hw.workqueue);
1219         wiphy_unregister(local->hw.wiphy);
1220         ieee80211_wep_free(local);
1221         ieee80211_led_exit(local);
1222 }
1223 EXPORT_SYMBOL(ieee80211_unregister_hw);
1224
1225 void ieee80211_free_hw(struct ieee80211_hw *hw)
1226 {
1227         struct ieee80211_local *local = hw_to_local(hw);
1228
1229         ieee80211_if_free(local->mdev);
1230         wiphy_free(local->hw.wiphy);
1231 }
1232 EXPORT_SYMBOL(ieee80211_free_hw);
1233
1234 static int __init ieee80211_init(void)
1235 {
1236         struct sk_buff *skb;
1237         int ret;
1238
1239         BUILD_BUG_ON(sizeof(struct ieee80211_tx_packet_data) > sizeof(skb->cb));
1240
1241 #ifdef CONFIG_MAC80211_RCSIMPLE
1242         ret = ieee80211_rate_control_register(&mac80211_rcsimple);
1243         if (ret)
1244                 return ret;
1245 #endif
1246
1247         ret = ieee80211_wme_register();
1248         if (ret) {
1249 #ifdef CONFIG_MAC80211_RCSIMPLE
1250                 ieee80211_rate_control_unregister(&mac80211_rcsimple);
1251 #endif
1252                 printk(KERN_DEBUG "ieee80211_init: failed to "
1253                        "initialize WME (err=%d)\n", ret);
1254                 return ret;
1255         }
1256
1257         ieee80211_debugfs_netdev_init();
1258         ieee80211_regdomain_init();
1259
1260         return 0;
1261 }
1262
1263 static void __exit ieee80211_exit(void)
1264 {
1265 #ifdef CONFIG_MAC80211_RCSIMPLE
1266         ieee80211_rate_control_unregister(&mac80211_rcsimple);
1267 #endif
1268
1269         ieee80211_wme_unregister();
1270         ieee80211_debugfs_netdev_exit();
1271 }
1272
1273
1274 subsys_initcall(ieee80211_init);
1275 module_exit(ieee80211_exit);
1276
1277 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1278 MODULE_LICENSE("GPL");