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
 338                 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
 339                 kfree(sdata->u.sta.extra_ie);
 340                 sdata->u.sta.extra_ie = NULL;
 341                 sdata->u.sta.extra_ie_len = 0;
 342                 /* fall through */
 343         default:
 344                 conf.if_id = dev->ifindex;
 345                 conf.type = sdata->type;
 346                 conf.mac_addr = dev->dev_addr;
 347                 /* disable all keys for as long as this netdev is down */
 348                 ieee80211_disable_keys(sdata);
 349                 local->ops->remove_interface(local_to_hw(local), &conf);
 350         }
 351
 352         if (local->open_count == 0) {
 353                 if (netif_running(local->mdev))
 354                         dev_close(local->mdev);
 355
 356                 if (local->ops->stop)
 357                         local->ops->stop(local_to_hw(local));
 358
 359                 tasklet_disable(&local->tx_pending_tasklet);
 360                 tasklet_disable(&local->tasklet);
 361         }
 362
 363         return 0;
 364 }
 365
 366 static void ieee80211_set_multicast_list(struct net_device *dev)
 367 {
 368         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 369         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 370         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 371
 372         allmulti = !!(dev->flags & IFF_ALLMULTI);
 373         promisc = !!(dev->flags & IFF_PROMISC);
 374         sdata_allmulti = sdata->flags & IEEE80211_SDATA_ALLMULTI;
 375         sdata_promisc = sdata->flags & IEEE80211_SDATA_PROMISC;
 376
 377         if (allmulti != sdata_allmulti) {
 378                 if (dev->flags & IFF_ALLMULTI)
 379                         atomic_inc(&local->iff_allmultis);
 380                 else
 381                         atomic_dec(&local->iff_allmultis);
 382                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 383         }
 384
 385         if (promisc != sdata_promisc) {
 386                 if (dev->flags & IFF_PROMISC)
 387                         atomic_inc(&local->iff_promiscs);
 388                 else
 389                         atomic_dec(&local->iff_promiscs);
 390                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 391         }
 392
 393         dev_mc_sync(local->mdev, dev);
 394 }
 395
 396 static const struct header_ops ieee80211_header_ops = {
 397         .create         = eth_header,
 398         .parse          = header_parse_80211,
 399         .rebuild        = eth_rebuild_header,
 400         .cache          = eth_header_cache,
 401         .cache_update   = eth_header_cache_update,
 402 };
 403
 404 /* Must not be called for mdev */
 405 void ieee80211_if_setup(struct net_device *dev)
 406 {
 407         ether_setup(dev);
 408         dev->header_ops = &ieee80211_header_ops;
 409         dev->hard_start_xmit = ieee80211_subif_start_xmit;
 410         dev->wireless_handlers = &ieee80211_iw_handler_def;
 411         dev->set_multicast_list = ieee80211_set_multicast_list;
 412         dev->change_mtu = ieee80211_change_mtu;
 413         dev->open = ieee80211_open;
 414         dev->stop = ieee80211_stop;
 415         dev->destructor = ieee80211_if_free;
 416 }
 417
 418 /* WDS specialties */
 419
 420 int ieee80211_if_update_wds(struct net_device *dev, u8 *remote_addr)
 421 {
 422         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 423         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 424         struct sta_info *sta;
 425         DECLARE_MAC_BUF(mac);
 426
 427         if (compare_ether_addr(remote_addr, sdata->u.wds.remote_addr) == 0)
 428                 return 0;
 429
 430         /* Create STA entry for the new peer */
 431         sta = sta_info_add(local, dev, remote_addr, GFP_KERNEL);
 432         if (!sta)
 433                 return -ENOMEM;
 434         sta_info_put(sta);
 435
 436         /* Remove STA entry for the old peer */
 437         sta = sta_info_get(local, sdata->u.wds.remote_addr);
 438         if (sta) {
 439                 sta_info_free(sta);
 440                 sta_info_put(sta);
 441         } else {
 442                 printk(KERN_DEBUG "%s: could not find STA entry for WDS link "
 443                        "peer %s\n",
 444                        dev->name, print_mac(mac, sdata->u.wds.remote_addr));
 445         }
 446
 447         /* Update WDS link data */
 448         memcpy(&sdata->u.wds.remote_addr, remote_addr, ETH_ALEN);
 449
 450         return 0;
 451 }
 452
 453 /* everything else */
 454
 455 static int __ieee80211_if_config(struct net_device *dev,
 456                                  struct sk_buff *beacon,
 457                                  struct ieee80211_tx_control *control)
 458 {
 459         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 460         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 461         struct ieee80211_if_conf conf;
 462
 463         if (!local->ops->config_interface || !netif_running(dev))
 464                 return 0;
 465
 466         memset(&conf, 0, sizeof(conf));
 467         conf.type = sdata->type;
 468         if (sdata->type == IEEE80211_IF_TYPE_STA ||
 469             sdata->type == IEEE80211_IF_TYPE_IBSS) {
 470                 conf.bssid = sdata->u.sta.bssid;
 471                 conf.ssid = sdata->u.sta.ssid;
 472                 conf.ssid_len = sdata->u.sta.ssid_len;
 473         } else if (sdata->type == IEEE80211_IF_TYPE_AP) {
 474                 conf.ssid = sdata->u.ap.ssid;
 475                 conf.ssid_len = sdata->u.ap.ssid_len;
 476                 conf.beacon = beacon;
 477                 conf.beacon_control = control;
 478         }
 479         return local->ops->config_interface(local_to_hw(local),
 480                                            dev->ifindex, &conf);
 481 }
 482
 483 int ieee80211_if_config(struct net_device *dev)
 484 {
 485         return __ieee80211_if_config(dev, NULL, NULL);
 486 }
 487
 488 int ieee80211_if_config_beacon(struct net_device *dev)
 489 {
 490         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 491         struct ieee80211_tx_control control;
 492         struct sk_buff *skb;
 493
 494         if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
 495                 return 0;
 496         skb = ieee80211_beacon_get(local_to_hw(local), dev->ifindex, &control);
 497         if (!skb)
 498                 return -ENOMEM;
 499         return __ieee80211_if_config(dev, skb, &control);
 500 }
 501
 502 int ieee80211_hw_config(struct ieee80211_local *local)
 503 {
 504         struct ieee80211_hw_mode *mode;
 505         struct ieee80211_channel *chan;
 506         int ret = 0;
 507
 508         if (local->sta_scanning) {
 509                 chan = local->scan_channel;
 510                 mode = local->scan_hw_mode;
 511         } else {
 512                 chan = local->oper_channel;
 513                 mode = local->oper_hw_mode;
 514         }
 515
 516         local->hw.conf.channel = chan->chan;
 517         local->hw.conf.channel_val = chan->val;
 518         if (!local->hw.conf.power_level) {
 519                 local->hw.conf.power_level = chan->power_level;
 520         } else {
 521                 local->hw.conf.power_level = min(chan->power_level,
 522                                                  local->hw.conf.power_level);
 523         }
 524         local->hw.conf.freq = chan->freq;
 525         local->hw.conf.phymode = mode->mode;
 526         local->hw.conf.antenna_max = chan->antenna_max;
 527         local->hw.conf.chan = chan;
 528         local->hw.conf.mode = mode;
 529
 530 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 531         printk(KERN_DEBUG "HW CONFIG: channel=%d freq=%d "
 532                "phymode=%d\n", local->hw.conf.channel, local->hw.conf.freq,
 533                local->hw.conf.phymode);
 534 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 535
 536         if (local->open_count)
 537                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
 538
 539         return ret;
 540 }
 541
 542 void ieee80211_erp_info_change_notify(struct net_device *dev, u8 changes)
 543 {
 544         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 545         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 546         if (local->ops->erp_ie_changed)
 547                 local->ops->erp_ie_changed(local_to_hw(local), changes,
 548                         !!(sdata->flags & IEEE80211_SDATA_USE_PROTECTION),
 549                         !(sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE));
 550 }
 551
 552 void ieee80211_reset_erp_info(struct net_device *dev)
 553 {
 554         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 555
 556         sdata->flags &= ~(IEEE80211_SDATA_USE_PROTECTION |
 557                         IEEE80211_SDATA_SHORT_PREAMBLE);
 558         ieee80211_erp_info_change_notify(dev,
 559                                          IEEE80211_ERP_CHANGE_PROTECTION |
 560                                          IEEE80211_ERP_CHANGE_PREAMBLE);
 561 }
 562
 563 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 564                                  struct sk_buff *skb,
 565                                  struct ieee80211_tx_status *status)
 566 {
 567         struct ieee80211_local *local = hw_to_local(hw);
 568         struct ieee80211_tx_status *saved;
 569         int tmp;
 570
 571         skb->dev = local->mdev;
 572         saved = kmalloc(sizeof(struct ieee80211_tx_status), GFP_ATOMIC);
 573         if (unlikely(!saved)) {
 574                 if (net_ratelimit())
 575                         printk(KERN_WARNING "%s: Not enough memory, "
 576                                "dropping tx status", skb->dev->name);
 577                 /* should be dev_kfree_skb_irq, but due to this function being
 578                  * named _irqsafe instead of just _irq we can't be sure that
 579                  * people won't call it from non-irq contexts */
 580                 dev_kfree_skb_any(skb);
 581                 return;
 582         }
 583         memcpy(saved, status, sizeof(struct ieee80211_tx_status));
 584         /* copy pointer to saved status into skb->cb for use by tasklet */
 585         memcpy(skb->cb, &saved, sizeof(saved));
 586
 587         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 588         skb_queue_tail(status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS ?
 589                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 590         tmp = skb_queue_len(&local->skb_queue) +
 591                 skb_queue_len(&local->skb_queue_unreliable);
 592         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 593                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 594                 memcpy(&saved, skb->cb, sizeof(saved));
 595                 kfree(saved);
 596                 dev_kfree_skb_irq(skb);
 597                 tmp--;
 598                 I802_DEBUG_INC(local->tx_status_drop);
 599         }
 600         tasklet_schedule(&local->tasklet);
 601 }
 602 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 603
 604 static void ieee80211_tasklet_handler(unsigned long data)
 605 {
 606         struct ieee80211_local *local = (struct ieee80211_local *) data;
 607         struct sk_buff *skb;
 608         struct ieee80211_rx_status rx_status;
 609         struct ieee80211_tx_status *tx_status;
 610
 611         while ((skb = skb_dequeue(&local->skb_queue)) ||
 612                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 613                 switch (skb->pkt_type) {
 614                 case IEEE80211_RX_MSG:
 615                         /* status is in skb->cb */
 616                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 617                         /* Clear skb->type in order to not confuse kernel
 618                          * netstack. */
 619                         skb->pkt_type = 0;
 620                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 621                         break;
 622                 case IEEE80211_TX_STATUS_MSG:
 623                         /* get pointer to saved status out of skb->cb */
 624                         memcpy(&tx_status, skb->cb, sizeof(tx_status));
 625                         skb->pkt_type = 0;
 626                         ieee80211_tx_status(local_to_hw(local),
 627                                             skb, tx_status);
 628                         kfree(tx_status);
 629                         break;
 630                 default: /* should never get here! */
 631                         printk(KERN_ERR "%s: Unknown message type (%d)\n",
 632                                wiphy_name(local->hw.wiphy), skb->pkt_type);
 633                         dev_kfree_skb(skb);
 634                         break;
 635                 }
 636         }
 637 }
 638
 639 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 640  * make a prepared TX frame (one that has been given to hw) to look like brand
 641  * new IEEE 802.11 frame that is ready to go through TX processing again.
 642  * Also, tx_packet_data in cb is restored from tx_control. */
 643 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 644                                       struct ieee80211_key *key,
 645                                       struct sk_buff *skb,
 646                                       struct ieee80211_tx_control *control)
 647 {
 648         int hdrlen, iv_len, mic_len;
 649         struct ieee80211_tx_packet_data *pkt_data;
 650
 651         pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
 652         pkt_data->ifindex = control->ifindex;
 653         pkt_data->flags = 0;
 654         if (control->flags & IEEE80211_TXCTL_REQ_TX_STATUS)
 655                 pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
 656         if (control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT)
 657                 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
 658         if (control->flags & IEEE80211_TXCTL_REQUEUE)
 659                 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
 660         pkt_data->queue = control->queue;
 661
 662         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 663
 664         if (!key)
 665                 goto no_key;
 666
 667         switch (key->conf.alg) {
 668         case ALG_WEP:
 669                 iv_len = WEP_IV_LEN;
 670                 mic_len = WEP_ICV_LEN;
 671                 break;
 672         case ALG_TKIP:
 673                 iv_len = TKIP_IV_LEN;
 674                 mic_len = TKIP_ICV_LEN;
 675                 break;
 676         case ALG_CCMP:
 677                 iv_len = CCMP_HDR_LEN;
 678                 mic_len = CCMP_MIC_LEN;
 679                 break;
 680         default:
 681                 goto no_key;
 682         }
 683
 684         if (skb->len >= mic_len &&
 685             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 686                 skb_trim(skb, skb->len - mic_len);
 687         if (skb->len >= iv_len && skb->len > hdrlen) {
 688                 memmove(skb->data + iv_len, skb->data, hdrlen);
 689                 skb_pull(skb, iv_len);
 690         }
 691
 692 no_key:
 693         {
 694                 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 695                 u16 fc = le16_to_cpu(hdr->frame_control);
 696                 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
 697                         fc &= ~IEEE80211_STYPE_QOS_DATA;
 698                         hdr->frame_control = cpu_to_le16(fc);
 699                         memmove(skb->data + 2, skb->data, hdrlen - 2);
 700                         skb_pull(skb, 2);
 701                 }
 702         }
 703 }
 704
 705 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
 706                          struct ieee80211_tx_status *status)
 707 {
 708         struct sk_buff *skb2;
 709         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 710         struct ieee80211_local *local = hw_to_local(hw);
 711         u16 frag, type;
 712         struct ieee80211_tx_status_rtap_hdr *rthdr;
 713         struct ieee80211_sub_if_data *sdata;
 714         int monitors;
 715
 716         if (!status) {
 717                 printk(KERN_ERR
 718                        "%s: ieee80211_tx_status called with NULL status\n",
 719                        wiphy_name(local->hw.wiphy));
 720                 dev_kfree_skb(skb);
 721                 return;
 722         }
 723
 724         if (status->excessive_retries) {
 725                 struct sta_info *sta;
 726                 sta = sta_info_get(local, hdr->addr1);
 727                 if (sta) {
 728                         if (sta->flags & WLAN_STA_PS) {
 729                                 /* The STA is in power save mode, so assume
 730                                  * that this TX packet failed because of that.
 731                                  */
 732                                 status->excessive_retries = 0;
 733                                 status->flags |= IEEE80211_TX_STATUS_TX_FILTERED;
 734                         }
 735                         sta_info_put(sta);
 736                 }
 737         }
 738
 739         if (status->flags & IEEE80211_TX_STATUS_TX_FILTERED) {
 740                 struct sta_info *sta;
 741                 sta = sta_info_get(local, hdr->addr1);
 742                 if (sta) {
 743                         sta->tx_filtered_count++;
 744
 745                         /* Clear the TX filter mask for this STA when sending
 746                          * the next packet. If the STA went to power save mode,
 747                          * this will happen when it is waking up for the next
 748                          * time. */
 749                         sta->clear_dst_mask = 1;
 750
 751                         /* TODO: Is the WLAN_STA_PS flag always set here or is
 752                          * the race between RX and TX status causing some
 753                          * packets to be filtered out before 80211.o gets an
 754                          * update for PS status? This seems to be the case, so
 755                          * no changes are likely to be needed. */
 756                         if (sta->flags & WLAN_STA_PS &&
 757                             skb_queue_len(&sta->tx_filtered) <
 758                             STA_MAX_TX_BUFFER) {
 759                                 ieee80211_remove_tx_extra(local, sta->key,
 760                                                           skb,
 761                                                           &status->control);
 762                                 skb_queue_tail(&sta->tx_filtered, skb);
 763                         } else if (!(sta->flags & WLAN_STA_PS) &&
 764                                    !(status->control.flags & IEEE80211_TXCTL_REQUEUE)) {
 765                                 /* Software retry the packet once */
 766                                 status->control.flags |= IEEE80211_TXCTL_REQUEUE;
 767                                 ieee80211_remove_tx_extra(local, sta->key,
 768                                                           skb,
 769                                                           &status->control);
 770                                 dev_queue_xmit(skb);
 771                         } else {
 772                                 if (net_ratelimit()) {
 773                                         printk(KERN_DEBUG "%s: dropped TX "
 774                                                "filtered frame queue_len=%d "
 775                                                "PS=%d @%lu\n",
 776                                                wiphy_name(local->hw.wiphy),
 777                                                skb_queue_len(
 778                                                        &sta->tx_filtered),
 779                                                !!(sta->flags & WLAN_STA_PS),
 780                                                jiffies);
 781                                 }
 782                                 dev_kfree_skb(skb);
 783                         }
 784                         sta_info_put(sta);
 785                         return;
 786                 }
 787         } else {
 788                 /* FIXME: STUPID to call this with both local and local->mdev */
 789                 rate_control_tx_status(local, local->mdev, skb, status);
 790         }
 791
 792         ieee80211_led_tx(local, 0);
 793
 794         /* SNMP counters
 795          * Fragments are passed to low-level drivers as separate skbs, so these
 796          * are actually fragments, not frames. Update frame counters only for
 797          * the first fragment of the frame. */
 798
 799         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 800         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 801
 802         if (status->flags & IEEE80211_TX_STATUS_ACK) {
 803                 if (frag == 0) {
 804                         local->dot11TransmittedFrameCount++;
 805                         if (is_multicast_ether_addr(hdr->addr1))
 806                                 local->dot11MulticastTransmittedFrameCount++;
 807                         if (status->retry_count > 0)
 808                                 local->dot11RetryCount++;
 809                         if (status->retry_count > 1)
 810                                 local->dot11MultipleRetryCount++;
 811                 }
 812
 813                 /* This counter shall be incremented for an acknowledged MPDU
 814                  * with an individual address in the address 1 field or an MPDU
 815                  * with a multicast address in the address 1 field of type Data
 816                  * or Management. */
 817                 if (!is_multicast_ether_addr(hdr->addr1) ||
 818                     type == IEEE80211_FTYPE_DATA ||
 819                     type == IEEE80211_FTYPE_MGMT)
 820                         local->dot11TransmittedFragmentCount++;
 821         } else {
 822                 if (frag == 0)
 823                         local->dot11FailedCount++;
 824         }
 825
 826         /* this was a transmitted frame, but now we want to reuse it */
 827         skb_orphan(skb);
 828
 829         if (!local->monitors) {
 830                 dev_kfree_skb(skb);
 831                 return;
 832         }
 833
 834         /* send frame to monitor interfaces now */
 835
 836         if (skb_headroom(skb) < sizeof(*rthdr)) {
 837                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 838                 dev_kfree_skb(skb);
 839                 return;
 840         }
 841
 842         rthdr = (struct ieee80211_tx_status_rtap_hdr*)
 843                                 skb_push(skb, sizeof(*rthdr));
 844
 845         memset(rthdr, 0, sizeof(*rthdr));
 846         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 847         rthdr->hdr.it_present =
 848                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 849                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
 850
 851         if (!(status->flags & IEEE80211_TX_STATUS_ACK) &&
 852             !is_multicast_ether_addr(hdr->addr1))
 853                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 854
 855         if ((status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) &&
 856             (status->control.flags & IEEE80211_TXCTL_USE_CTS_PROTECT))
 857                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 858         else if (status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS)
 859                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 860
 861         rthdr->data_retries = status->retry_count;
 862
 863         rcu_read_lock();
 864         monitors = local->monitors;
 865         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 866                 /*
 867                  * Using the monitors counter is possibly racy, but
 868                  * if the value is wrong we simply either clone the skb
 869                  * once too much or forget sending it to one monitor iface
 870                  * The latter case isn't nice but fixing the race is much
 871                  * more complicated.
 872                  */
 873                 if (!monitors || !skb)
 874                         goto out;
 875
 876                 if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
 877                         if (!netif_running(sdata->dev))
 878                                 continue;
 879                         monitors--;
 880                         if (monitors)
 881                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 882                         else
 883                                 skb2 = NULL;
 884                         skb->dev = sdata->dev;
 885                         /* XXX: is this sufficient for BPF? */
 886                         skb_set_mac_header(skb, 0);
 887                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 888                         skb->pkt_type = PACKET_OTHERHOST;
 889                         skb->protocol = htons(ETH_P_802_2);
 890                         memset(skb->cb, 0, sizeof(skb->cb));
 891                         netif_rx(skb);
 892                         skb = skb2;
 893                 }
 894         }
 895  out:
 896         rcu_read_unlock();
 897         if (skb)
 898                 dev_kfree_skb(skb);
 899 }
 900 EXPORT_SYMBOL(ieee80211_tx_status);
 901
 902 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 903                                         const struct ieee80211_ops *ops)
 904 {
 905         struct net_device *mdev;
 906         struct ieee80211_local *local;
 907         struct ieee80211_sub_if_data *sdata;
 908         int priv_size;
 909         struct wiphy *wiphy;
 910
 911         /* Ensure 32-byte alignment of our private data and hw private data.
 912          * We use the wiphy priv data for both our ieee80211_local and for
 913          * the driver's private data
 914          *
 915          * In memory it'll be like this:
 916          *
 917          * +-------------------------+
 918          * | struct wiphy           |
 919          * +-------------------------+
 920          * | struct ieee80211_local  |
 921          * +-------------------------+
 922          * | driver's private data   |
 923          * +-------------------------+
 924          *
 925          */
 926         priv_size = ((sizeof(struct ieee80211_local) +
 927                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
 928                     priv_data_len;
 929
 930         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 931
 932         if (!wiphy)
 933                 return NULL;
 934
 935         wiphy->privid = mac80211_wiphy_privid;
 936
 937         local = wiphy_priv(wiphy);
 938         local->hw.wiphy = wiphy;
 939
 940         local->hw.priv = (char *)local +
 941                          ((sizeof(struct ieee80211_local) +
 942                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
 943
 944         BUG_ON(!ops->tx);
 945         BUG_ON(!ops->start);
 946         BUG_ON(!ops->stop);
 947         BUG_ON(!ops->config);
 948         BUG_ON(!ops->add_interface);
 949         BUG_ON(!ops->remove_interface);
 950         BUG_ON(!ops->configure_filter);
 951         local->ops = ops;
 952
 953         /* for now, mdev needs sub_if_data :/ */
 954         mdev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
 955                             "wmaster%d", ether_setup);
 956         if (!mdev) {
 957                 wiphy_free(wiphy);
 958                 return NULL;
 959         }
 960
 961         sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
 962         mdev->ieee80211_ptr = &sdata->wdev;
 963         sdata->wdev.wiphy = wiphy;
 964
 965         local->hw.queues = 1; /* default */
 966
 967         local->mdev = mdev;
 968         local->rx_pre_handlers = ieee80211_rx_pre_handlers;
 969         local->rx_handlers = ieee80211_rx_handlers;
 970         local->tx_handlers = ieee80211_tx_handlers;
 971
 972         local->bridge_packets = 1;
 973
 974         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
 975         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
 976         local->short_retry_limit = 7;
 977         local->long_retry_limit = 4;
 978         local->hw.conf.radio_enabled = 1;
 979
 980         local->enabled_modes = ~0;
 981
 982         INIT_LIST_HEAD(&local->modes_list);
 983
 984         INIT_LIST_HEAD(&local->interfaces);
 985
 986         INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
 987         ieee80211_rx_bss_list_init(mdev);
 988
 989         sta_info_init(local);
 990
 991         mdev->hard_start_xmit = ieee80211_master_start_xmit;
 992         mdev->open = ieee80211_master_open;
 993         mdev->stop = ieee80211_master_stop;
 994         mdev->type = ARPHRD_IEEE80211;
 995         mdev->header_ops = &ieee80211_header_ops;
 996         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
 997
 998         sdata->type = IEEE80211_IF_TYPE_AP;
 999         sdata->dev = mdev;
1000         sdata->local = local;
1001         sdata->u.ap.force_unicast_rateidx = -1;
1002         sdata->u.ap.max_ratectrl_rateidx = -1;
1003         ieee80211_if_sdata_init(sdata);
1004         /* no RCU needed since we're still during init phase */
1005         list_add_tail(&sdata->list, &local->interfaces);
1006
1007         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1008                      (unsigned long)local);
1009         tasklet_disable(&local->tx_pending_tasklet);
1010
1011         tasklet_init(&local->tasklet,
1012                      ieee80211_tasklet_handler,
1013                      (unsigned long) local);
1014         tasklet_disable(&local->tasklet);
1015
1016         skb_queue_head_init(&local->skb_queue);
1017         skb_queue_head_init(&local->skb_queue_unreliable);
1018
1019         return local_to_hw(local);
1020 }
1021 EXPORT_SYMBOL(ieee80211_alloc_hw);
1022
1023 int ieee80211_register_hw(struct ieee80211_hw *hw)
1024 {
1025         struct ieee80211_local *local = hw_to_local(hw);
1026         const char *name;
1027         int result;
1028
1029         result = wiphy_register(local->hw.wiphy);
1030         if (result < 0)
1031                 return result;
1032
1033         name = wiphy_dev(local->hw.wiphy)->driver->name;
1034         local->hw.workqueue = create_singlethread_workqueue(name);
1035         if (!local->hw.workqueue) {
1036                 result = -ENOMEM;
1037                 goto fail_workqueue;
1038         }
1039
1040         /*
1041          * The hardware needs headroom for sending the frame,
1042          * and we need some headroom for passing the frame to monitor
1043          * interfaces, but never both at the same time.
1044          */
1045         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1046                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
1047
1048         debugfs_hw_add(local);
1049
1050         local->hw.conf.beacon_int = 1000;
1051
1052         local->wstats_flags |= local->hw.max_rssi ?
1053                                IW_QUAL_LEVEL_UPDATED : IW_QUAL_LEVEL_INVALID;
1054         local->wstats_flags |= local->hw.max_signal ?
1055                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1056         local->wstats_flags |= local->hw.max_noise ?
1057                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1058         if (local->hw.max_rssi < 0 || local->hw.max_noise < 0)
1059                 local->wstats_flags |= IW_QUAL_DBM;
1060
1061         result = sta_info_start(local);
1062         if (result < 0)
1063                 goto fail_sta_info;
1064
1065         rtnl_lock();
1066         result = dev_alloc_name(local->mdev, local->mdev->name);
1067         if (result < 0)
1068                 goto fail_dev;
1069
1070         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1071         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1072
1073         result = register_netdevice(local->mdev);
1074         if (result < 0)
1075                 goto fail_dev;
1076
1077         ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1078         ieee80211_if_set_type(local->mdev, IEEE80211_IF_TYPE_AP);
1079
1080         result = ieee80211_init_rate_ctrl_alg(local,
1081                                               hw->rate_control_algorithm);
1082         if (result < 0) {
1083                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1084                        "algorithm\n", wiphy_name(local->hw.wiphy));
1085                 goto fail_rate;
1086         }
1087
1088         result = ieee80211_wep_init(local);
1089
1090         if (result < 0) {
1091                 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1092                        wiphy_name(local->hw.wiphy));
1093                 goto fail_wep;
1094         }
1095
1096         ieee80211_install_qdisc(local->mdev);
1097
1098         /* add one default STA interface */
1099         result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
1100                                   IEEE80211_IF_TYPE_STA);
1101         if (result)
1102                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1103                        wiphy_name(local->hw.wiphy));
1104
1105         local->reg_state = IEEE80211_DEV_REGISTERED;
1106         rtnl_unlock();
1107
1108         ieee80211_led_init(local);
1109
1110         return 0;
1111
1112 fail_wep:
1113         rate_control_deinitialize(local);
1114 fail_rate:
1115         ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1116         unregister_netdevice(local->mdev);
1117 fail_dev:
1118         rtnl_unlock();
1119         sta_info_stop(local);
1120 fail_sta_info:
1121         debugfs_hw_del(local);
1122         destroy_workqueue(local->hw.workqueue);
1123 fail_workqueue:
1124         wiphy_unregister(local->hw.wiphy);
1125         return result;
1126 }
1127 EXPORT_SYMBOL(ieee80211_register_hw);
1128
1129 int ieee80211_register_hwmode(struct ieee80211_hw *hw,
1130                               struct ieee80211_hw_mode *mode)
1131 {
1132         struct ieee80211_local *local = hw_to_local(hw);
1133         struct ieee80211_rate *rate;
1134         int i;
1135
1136         INIT_LIST_HEAD(&mode->list);
1137         list_add_tail(&mode->list, &local->modes_list);
1138
1139         local->hw_modes |= (1 << mode->mode);
1140         for (i = 0; i < mode->num_rates; i++) {
1141                 rate = &(mode->rates[i]);
1142                 rate->rate_inv = CHAN_UTIL_RATE_LCM / rate->rate;
1143         }
1144         ieee80211_prepare_rates(local, mode);
1145
1146         if (!local->oper_hw_mode) {
1147                 /* Default to this mode */
1148                 local->hw.conf.phymode = mode->mode;
1149                 local->oper_hw_mode = local->scan_hw_mode = mode;
1150                 local->oper_channel = local->scan_channel = &mode->channels[0];
1151                 local->hw.conf.mode = local->oper_hw_mode;
1152                 local->hw.conf.chan = local->oper_channel;
1153         }
1154
1155         if (!(hw->flags & IEEE80211_HW_DEFAULT_REG_DOMAIN_CONFIGURED))
1156                 ieee80211_set_default_regdomain(mode);
1157
1158         return 0;
1159 }
1160 EXPORT_SYMBOL(ieee80211_register_hwmode);
1161
1162 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1163 {
1164         struct ieee80211_local *local = hw_to_local(hw);
1165         struct ieee80211_sub_if_data *sdata, *tmp;
1166         int i;
1167
1168         tasklet_kill(&local->tx_pending_tasklet);
1169         tasklet_kill(&local->tasklet);
1170
1171         rtnl_lock();
1172
1173         BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
1174
1175         local->reg_state = IEEE80211_DEV_UNREGISTERED;
1176
1177         /*
1178          * At this point, interface list manipulations are fine
1179          * because the driver cannot be handing us frames any
1180          * more and the tasklet is killed.
1181          */
1182
1183         /*
1184          * First, we remove all non-master interfaces. Do this because they
1185          * may have bss pointer dependency on the master, and when we free
1186          * the master these would be freed as well, breaking our list
1187          * iteration completely.
1188          */
1189         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1190                 if (sdata->dev == local->mdev)
1191                         continue;
1192                 list_del(&sdata->list);
1193                 __ieee80211_if_del(local, sdata);
1194         }
1195
1196         /* then, finally, remove the master interface */
1197         __ieee80211_if_del(local, IEEE80211_DEV_TO_SUB_IF(local->mdev));
1198
1199         rtnl_unlock();
1200
1201         ieee80211_rx_bss_list_deinit(local->mdev);
1202         ieee80211_clear_tx_pending(local);
1203         sta_info_stop(local);
1204         rate_control_deinitialize(local);
1205         debugfs_hw_del(local);
1206
1207         for (i = 0; i < NUM_IEEE80211_MODES; i++) {
1208                 kfree(local->supp_rates[i]);
1209                 kfree(local->basic_rates[i]);
1210         }
1211
1212         if (skb_queue_len(&local->skb_queue)
1213                         || skb_queue_len(&local->skb_queue_unreliable))
1214                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1215                        wiphy_name(local->hw.wiphy));
1216         skb_queue_purge(&local->skb_queue);
1217         skb_queue_purge(&local->skb_queue_unreliable);
1218
1219         destroy_workqueue(local->hw.workqueue);
1220         wiphy_unregister(local->hw.wiphy);
1221         ieee80211_wep_free(local);
1222         ieee80211_led_exit(local);
1223 }
1224 EXPORT_SYMBOL(ieee80211_unregister_hw);
1225
1226 void ieee80211_free_hw(struct ieee80211_hw *hw)
1227 {
1228         struct ieee80211_local *local = hw_to_local(hw);
1229
1230         ieee80211_if_free(local->mdev);
1231         wiphy_free(local->hw.wiphy);
1232 }
1233 EXPORT_SYMBOL(ieee80211_free_hw);
1234
1235 static int __init ieee80211_init(void)
1236 {
1237         struct sk_buff *skb;
1238         int ret;
1239
1240         BUILD_BUG_ON(sizeof(struct ieee80211_tx_packet_data) > sizeof(skb->cb));
1241
1242 #ifdef CONFIG_MAC80211_RCSIMPLE
1243         ret = ieee80211_rate_control_register(&mac80211_rcsimple);
1244         if (ret)
1245                 return ret;
1246 #endif
1247
1248         ret = ieee80211_wme_register();
1249         if (ret) {
1250 #ifdef CONFIG_MAC80211_RCSIMPLE
1251                 ieee80211_rate_control_unregister(&mac80211_rcsimple);
1252 #endif
1253                 printk(KERN_DEBUG "ieee80211_init: failed to "
1254                        "initialize WME (err=%d)\n", ret);
1255                 return ret;
1256         }
1257
1258         ieee80211_debugfs_netdev_init();
1259         ieee80211_regdomain_init();
1260
1261         return 0;
1262 }
1263
1264 static void __exit ieee80211_exit(void)
1265 {
1266 #ifdef CONFIG_MAC80211_RCSIMPLE
1267         ieee80211_rate_control_unregister(&mac80211_rcsimple);
1268 #endif
1269
1270         ieee80211_wme_unregister();
1271         ieee80211_debugfs_netdev_exit();
1272 }
1273
1274
1275 subsys_initcall(ieee80211_init);
1276 module_exit(ieee80211_exit);
1277
1278 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1279 MODULE_LICENSE("GPL");