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