package/mac80211/src/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/cfg80211.h>
  25
  26 #include "ieee80211_i.h"
  27 #include "ieee80211_rate.h"
  28 #include "wep.h"
  29 #include "wme.h"
  30 #include "aes_ccm.h"
  31 #include "ieee80211_led.h"
  32 #include "cfg.h"
  33 #include "debugfs.h"
  34 #include "debugfs_netdev.h"
  35
  36 /*
  37  * For seeing transmitted packets on monitor interfaces
  38  * we have a radiotap header too.
  39  */
  40 struct ieee80211_tx_status_rtap_hdr {
  41         struct ieee80211_radiotap_header hdr;
  42         __le16 tx_flags;
  43         u8 data_retries;
  44 } __attribute__ ((packed));
  45
  46 /* common interface routines */
  47
  48 static int header_parse_80211(struct sk_buff *skb, unsigned char *haddr)
  49 {
  50         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
  51         return ETH_ALEN;
  52 }
  53
  54 /* must be called under mdev tx lock */
  55 static void ieee80211_configure_filter(struct ieee80211_local *local)
  56 {
  57         unsigned int changed_flags;
  58         unsigned int new_flags = 0;
  59
  60         if (atomic_read(&local->iff_promiscs))
  61                 new_flags |= FIF_PROMISC_IN_BSS;
  62
  63         if (atomic_read(&local->iff_allmultis))
  64                 new_flags |= FIF_ALLMULTI;
  65
  66         if (local->monitors)
  67                 new_flags |= FIF_CONTROL |
  68                              FIF_OTHER_BSS |
  69                              FIF_BCN_PRBRESP_PROMISC;
  70
  71         changed_flags = local->filter_flags ^ new_flags;
  72
  73         /* be a bit nasty */
  74         new_flags |= (1<<31);
  75
  76         local->ops->configure_filter(local_to_hw(local),
  77                                      changed_flags, &new_flags,
  78                                      local->mdev->mc_count,
  79                                      local->mdev->mc_list);
  80
  81         WARN_ON(new_flags & (1<<31));
  82
  83         local->filter_flags = new_flags & ~(1<<31);
  84 }
  85
  86 /* master interface */
  87
  88 static int ieee80211_master_open(struct net_device *dev)
  89 {
  90         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
  91         struct ieee80211_sub_if_data *sdata;
  92         int res = -EOPNOTSUPP;
  93
  94         /* we hold the RTNL here so can safely walk the list */
  95         list_for_each_entry(sdata, &local->interfaces, list) {
  96                 if (sdata->dev != dev && netif_running(sdata->dev)) {
  97                         res = 0;
  98                         break;
  99                 }
 100         }
 101         return res;
 102 }
 103
 104 static int ieee80211_master_stop(struct net_device *dev)
 105 {
 106         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 107         struct ieee80211_sub_if_data *sdata;
 108
 109         /* we hold the RTNL here so can safely walk the list */
 110         list_for_each_entry(sdata, &local->interfaces, list)
 111                 if (sdata->dev != dev && netif_running(sdata->dev))
 112                         dev_close(sdata->dev);
 113
 114         return 0;
 115 }
 116
 117 static void ieee80211_master_set_multicast_list(struct net_device *dev)
 118 {
 119         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 120
 121         ieee80211_configure_filter(local);
 122 }
 123
 124 /* regular interfaces */
 125
 126 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 127 {
 128         /* FIX: what would be proper limits for MTU?
 129          * This interface uses 802.3 frames. */
 130         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6) {
 131                 printk(KERN_WARNING "%s: invalid MTU %d\n",
 132                        dev->name, new_mtu);
 133                 return -EINVAL;
 134         }
 135
 136 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 137         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
 138 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 139         dev->mtu = new_mtu;
 140         return 0;
 141 }
 142
 143 static inline int identical_mac_addr_allowed(int type1, int type2)
 144 {
 145         return (type1 == IEEE80211_IF_TYPE_MNTR ||
 146                 type2 == IEEE80211_IF_TYPE_MNTR ||
 147                 (type1 == IEEE80211_IF_TYPE_AP &&
 148                  type2 == IEEE80211_IF_TYPE_WDS) ||
 149                 (type1 == IEEE80211_IF_TYPE_WDS &&
 150                  (type2 == IEEE80211_IF_TYPE_WDS ||
 151                   type2 == IEEE80211_IF_TYPE_AP)) ||
 152                 (type1 == IEEE80211_IF_TYPE_AP &&
 153                  type2 == IEEE80211_IF_TYPE_VLAN) ||
 154                 (type1 == IEEE80211_IF_TYPE_VLAN &&
 155                  (type2 == IEEE80211_IF_TYPE_AP ||
 156                   type2 == IEEE80211_IF_TYPE_VLAN)));
 157 }
 158
 159 static int ieee80211_open(struct net_device *dev)
 160 {
 161         struct ieee80211_sub_if_data *sdata, *nsdata;
 162         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 163         struct ieee80211_if_init_conf conf;
 164         int res;
 165
 166         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 167
 168         /* we hold the RTNL here so can safely walk the list */
 169         list_for_each_entry(nsdata, &local->interfaces, list) {
 170                 struct net_device *ndev = nsdata->dev;
 171
 172                 if (ndev != dev && ndev != local->mdev && netif_running(ndev) &&
 173                     compare_ether_addr(dev->dev_addr, ndev->dev_addr) == 0) {
 174                         /*
 175                          * check whether it may have the same address
 176                          */
 177                         if (!identical_mac_addr_allowed(sdata->type,
 178                                                         nsdata->type))
 179                                 return -ENOTUNIQ;
 180
 181                         /*
 182                          * can only add VLANs to enabled APs
 183                          */
 184                         if (sdata->type == IEEE80211_IF_TYPE_VLAN &&
 185                             nsdata->type == IEEE80211_IF_TYPE_AP &&
 186                             netif_running(nsdata->dev))
 187                                 sdata->u.vlan.ap = nsdata;
 188                 }
 189         }
 190
 191         switch (sdata->type) {
 192         case IEEE80211_IF_TYPE_WDS:
 193                 if (is_zero_ether_addr(sdata->u.wds.remote_addr))
 194                         return -ENOLINK;
 195                 break;
 196         case IEEE80211_IF_TYPE_VLAN:
 197                 if (!sdata->u.vlan.ap)
 198                         return -ENOLINK;
 199                 break;
 200         case IEEE80211_IF_TYPE_AP:
 201         case IEEE80211_IF_TYPE_STA:
 202         case IEEE80211_IF_TYPE_MNTR:
 203         case IEEE80211_IF_TYPE_IBSS:
 204                 /* no special treatment */
 205                 break;
 206         case IEEE80211_IF_TYPE_INVALID:
 207                 /* cannot happen */
 208                 WARN_ON(1);
 209                 break;
 210         }
 211
 212         if (local->open_count == 0) {
 213                 res = 0;
 214                 if (local->ops->start)
 215                         res = local->ops->start(local_to_hw(local));
 216                 if (res)
 217                         return res;
 218         }
 219
 220         switch (sdata->type) {
 221         case IEEE80211_IF_TYPE_VLAN:
 222                 list_add(&sdata->u.vlan.list, &sdata->u.vlan.ap->u.ap.vlans);
 223                 /* no need to tell driver */
 224                 break;
 225         case IEEE80211_IF_TYPE_MNTR:
 226                 /* must be before the call to ieee80211_configure_filter */
 227                 local->monitors++;
 228                 if (local->monitors == 1) {
 229                         netif_tx_lock_bh(local->mdev);
 230                         ieee80211_configure_filter(local);
 231                         netif_tx_unlock_bh(local->mdev);
 232
 233                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 234                         ieee80211_hw_config(local);
 235                 }
 236                 break;
 237         case IEEE80211_IF_TYPE_STA:
 238         case IEEE80211_IF_TYPE_IBSS:
 239                 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
 240                 /* fall through */
 241         default:
 242                 conf.if_id = dev->ifindex;
 243                 conf.type = sdata->type;
 244                 conf.mac_addr = dev->dev_addr;
 245                 res = local->ops->add_interface(local_to_hw(local), &conf);
 246                 if (res && !local->open_count && local->ops->stop)
 247                         local->ops->stop(local_to_hw(local));
 248                 if (res)
 249                         return res;
 250
 251                 ieee80211_if_config(dev);
 252                 ieee80211_reset_erp_info(dev);
 253                 ieee80211_enable_keys(sdata);
 254
 255                 if (sdata->type == IEEE80211_IF_TYPE_STA &&
 256                     !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
 257                         netif_carrier_off(dev);
 258                 else
 259                         netif_carrier_on(dev);
 260         }
 261
 262         if (local->open_count == 0) {
 263                 res = dev_open(local->mdev);
 264                 WARN_ON(res);
 265                 tasklet_enable(&local->tx_pending_tasklet);
 266                 tasklet_enable(&local->tasklet);
 267         }
 268
 269         local->open_count++;
 270
 271         netif_start_queue(dev);
 272
 273         return 0;
 274 }
 275
 276 static int ieee80211_stop(struct net_device *dev)
 277 {
 278         struct ieee80211_sub_if_data *sdata;
 279         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 280         struct ieee80211_if_init_conf conf;
 281
 282         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 283
 284         netif_stop_queue(dev);
 285
 286         dev_mc_unsync(local->mdev, dev);
 287
 288         /* down all dependent devices, that is VLANs */
 289         if (sdata->type == IEEE80211_IF_TYPE_AP) {
 290                 struct ieee80211_sub_if_data *vlan, *tmp;
 291
 292                 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
 293                                          u.vlan.list)
 294                         dev_close(vlan->dev);
 295                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 296         }
 297
 298         local->open_count--;
 299
 300         switch (sdata->type) {
 301         case IEEE80211_IF_TYPE_VLAN:
 302                 list_del(&sdata->u.vlan.list);
 303                 sdata->u.vlan.ap = NULL;
 304                 /* no need to tell driver */
 305                 break;
 306         case IEEE80211_IF_TYPE_MNTR:
 307                 local->monitors--;
 308                 if (local->monitors == 0) {
 309                         netif_tx_lock_bh(local->mdev);
 310                         ieee80211_configure_filter(local);
 311                         netif_tx_unlock_bh(local->mdev);
 312
 313                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 314                         ieee80211_hw_config(local);
 315                 }
 316                 break;
 317         case IEEE80211_IF_TYPE_STA:
 318         case IEEE80211_IF_TYPE_IBSS:
 319                 sdata->u.sta.state = IEEE80211_DISABLED;
 320                 del_timer_sync(&sdata->u.sta.timer);
 321                 /*
 322                  * When we get here, the interface is marked down.
 323                  * Call synchronize_rcu() to wait for the RX path
 324                  * should it be using the interface and enqueuing
 325                  * frames at this very time on another CPU.
 326                  */
 327                 synchronize_rcu();
 328                 skb_queue_purge(&sdata->u.sta.skb_queue);
 329
 330                 if (!local->ops->hw_scan &&
 331                     local->scan_dev == sdata->dev) {
 332                         local->sta_scanning = 0;
 333                         cancel_delayed_work(&local->scan_work);
 334                 }
 335                 flush_workqueue(local->hw.workqueue);
 336                 /* fall through */
 337         default:
 338                 conf.if_id = dev->ifindex;
 339                 conf.type = sdata->type;
 340                 conf.mac_addr = dev->dev_addr;
 341                 /* disable all keys for as long as this netdev is down */
 342                 ieee80211_disable_keys(sdata);
 343                 local->ops->remove_interface(local_to_hw(local), &conf);
 344         }
 345
 346         if (local->open_count == 0) {
 347                 if (netif_running(local->mdev))
 348                         dev_close(local->mdev);
 349
 350                 if (local->ops->stop)
 351                         local->ops->stop(local_to_hw(local));
 352
 353                 tasklet_disable(&local->tx_pending_tasklet);
 354                 tasklet_disable(&local->tasklet);
 355         }
 356
 357         return 0;
 358 }
 359
 360 static void ieee80211_set_multicast_list(struct net_device *dev)
 361 {
 362         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 363         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 364         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 365
 366         allmulti = !!(dev->flags & IFF_ALLMULTI);
 367         promisc = !!(dev->flags & IFF_PROMISC);
 368         sdata_allmulti = sdata->flags & IEEE80211_SDATA_ALLMULTI;
 369         sdata_promisc = sdata->flags & IEEE80211_SDATA_PROMISC;
 370
 371         if (allmulti != sdata_allmulti) {
 372                 if (dev->flags & IFF_ALLMULTI)
 373                         atomic_inc(&local->iff_allmultis);
 374                 else
 375                         atomic_dec(&local->iff_allmultis);
 376                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 377         }
 378
 379         if (promisc != sdata_promisc) {
 380                 if (dev->flags & IFF_PROMISC)
 381                         atomic_inc(&local->iff_promiscs);
 382                 else
 383                         atomic_dec(&local->iff_promiscs);
 384                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 385         }
 386
 387         dev_mc_sync(local->mdev, dev);
 388 }
 389
 390 /* Must not be called for mdev */
 391 void ieee80211_if_setup(struct net_device *dev)
 392 {
 393         ether_setup(dev);
 394         dev->hard_start_xmit = ieee80211_subif_start_xmit;
 395         dev->wireless_handlers = &ieee80211_iw_handler_def;
 396         dev->set_multicast_list = ieee80211_set_multicast_list;
 397         dev->change_mtu = ieee80211_change_mtu;
 398         dev->open = ieee80211_open;
 399         dev->stop = ieee80211_stop;
 400         dev->destructor = ieee80211_if_free;
 401 }
 402
 403 /* WDS specialties */
 404
 405 int ieee80211_if_update_wds(struct net_device *dev, u8 *remote_addr)
 406 {
 407         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 408         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 409         struct sta_info *sta;
 410
 411         if (compare_ether_addr(remote_addr, sdata->u.wds.remote_addr) == 0)
 412                 return 0;
 413
 414         /* Create STA entry for the new peer */
 415         sta = sta_info_add(local, dev, remote_addr, GFP_KERNEL);
 416         if (!sta)
 417                 return -ENOMEM;
 418         sta_info_put(sta);
 419
 420         /* Remove STA entry for the old peer */
 421         sta = sta_info_get(local, sdata->u.wds.remote_addr);
 422         if (sta) {
 423                 sta_info_free(sta);
 424                 sta_info_put(sta);
 425         } else {
 426                 printk(KERN_DEBUG "%s: could not find STA entry for WDS link "
 427                        "peer " MAC_FMT "\n",
 428                        dev->name, MAC_ARG(sdata->u.wds.remote_addr));
 429         }
 430
 431         /* Update WDS link data */
 432         memcpy(&sdata->u.wds.remote_addr, remote_addr, ETH_ALEN);
 433
 434         return 0;
 435 }
 436
 437 /* everything else */
 438
 439 static int __ieee80211_if_config(struct net_device *dev,
 440                                  struct sk_buff *beacon,
 441                                  struct ieee80211_tx_control *control)
 442 {
 443         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 444         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 445         struct ieee80211_if_conf conf;
 446
 447         if (!local->ops->config_interface || !netif_running(dev))
 448                 return 0;
 449
 450         memset(&conf, 0, sizeof(conf));
 451         conf.type = sdata->type;
 452         if (sdata->type == IEEE80211_IF_TYPE_STA ||
 453             sdata->type == IEEE80211_IF_TYPE_IBSS) {
 454                 conf.bssid = sdata->u.sta.bssid;
 455                 conf.ssid = sdata->u.sta.ssid;
 456                 conf.ssid_len = sdata->u.sta.ssid_len;
 457         } else if (sdata->type == IEEE80211_IF_TYPE_AP) {
 458                 conf.ssid = sdata->u.ap.ssid;
 459                 conf.ssid_len = sdata->u.ap.ssid_len;
 460                 conf.beacon = beacon;
 461                 conf.beacon_control = control;
 462         }
 463         return local->ops->config_interface(local_to_hw(local),
 464                                            dev->ifindex, &conf);
 465 }
 466
 467 int ieee80211_if_config(struct net_device *dev)
 468 {
 469         return __ieee80211_if_config(dev, NULL, NULL);
 470 }
 471
 472 int ieee80211_if_config_beacon(struct net_device *dev)
 473 {
 474         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 475         struct ieee80211_tx_control control;
 476         struct sk_buff *skb;
 477
 478         if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
 479                 return 0;
 480         skb = ieee80211_beacon_get(local_to_hw(local), dev->ifindex, &control);
 481         if (!skb)
 482                 return -ENOMEM;
 483         return __ieee80211_if_config(dev, skb, &control);
 484 }
 485
 486 int ieee80211_hw_config(struct ieee80211_local *local)
 487 {
 488         struct ieee80211_hw_mode *mode;
 489         struct ieee80211_channel *chan;
 490         int ret = 0;
 491
 492         if (local->sta_scanning) {
 493                 chan = local->scan_channel;
 494                 mode = local->scan_hw_mode;
 495         } else {
 496                 chan = local->oper_channel;
 497                 mode = local->oper_hw_mode;
 498         }
 499
 500         local->hw.conf.channel = chan->chan;
 501         local->hw.conf.channel_val = chan->val;
 502         if (!local->hw.conf.power_level) {
 503                 local->hw.conf.power_level = chan->power_level;
 504         } else {
 505                 local->hw.conf.power_level = min(chan->power_level,
 506                                                  local->hw.conf.power_level);
 507         }
 508         local->hw.conf.freq = chan->freq;
 509         local->hw.conf.phymode = mode->mode;
 510         local->hw.conf.antenna_max = chan->antenna_max;
 511         local->hw.conf.chan = chan;
 512         local->hw.conf.mode = mode;
 513
 514 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 515         printk(KERN_DEBUG "HW CONFIG: channel=%d freq=%d "
 516                "phymode=%d\n", local->hw.conf.channel, local->hw.conf.freq,
 517                local->hw.conf.phymode);
 518 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 519
 520         if (local->open_count)
 521                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
 522
 523         return ret;
 524 }
 525
 526 void ieee80211_erp_info_change_notify(struct net_device *dev, u8 changes)
 527 {
 528         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 529         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 530         if (local->ops->erp_ie_changed)
 531                 local->ops->erp_ie_changed(local_to_hw(local), changes,
 532                         !!(sdata->flags & IEEE80211_SDATA_USE_PROTECTION),
 533                         !(sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE));
 534 }
 535
 536 void ieee80211_reset_erp_info(struct net_device *dev)
 537 {
 538         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 539
 540         sdata->flags &= ~(IEEE80211_SDATA_USE_PROTECTION |
 541                         IEEE80211_SDATA_SHORT_PREAMBLE);
 542         ieee80211_erp_info_change_notify(dev,
 543                                          IEEE80211_ERP_CHANGE_PROTECTION |
 544                                          IEEE80211_ERP_CHANGE_PREAMBLE);
 545 }
 546
 547 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 548                                  struct sk_buff *skb,
 549                                  struct ieee80211_tx_status *status)
 550 {
 551         struct ieee80211_local *local = hw_to_local(hw);
 552         struct ieee80211_tx_status *saved;
 553         int tmp;
 554
 555         skb->dev = local->mdev;
 556         saved = kmalloc(sizeof(struct ieee80211_tx_status), GFP_ATOMIC);
 557         if (unlikely(!saved)) {
 558                 if (net_ratelimit())
 559                         printk(KERN_WARNING "%s: Not enough memory, "
 560                                "dropping tx status", skb->dev->name);
 561                 /* should be dev_kfree_skb_irq, but due to this function being
 562                  * named _irqsafe instead of just _irq we can't be sure that
 563                  * people won't call it from non-irq contexts */
 564                 dev_kfree_skb_any(skb);
 565                 return;
 566         }
 567         memcpy(saved, status, sizeof(struct ieee80211_tx_status));
 568         /* copy pointer to saved status into skb->cb for use by tasklet */
 569         memcpy(skb->cb, &saved, sizeof(saved));
 570
 571         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 572         skb_queue_tail(status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS ?
 573                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 574         tmp = skb_queue_len(&local->skb_queue) +
 575                 skb_queue_len(&local->skb_queue_unreliable);
 576         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 577                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 578                 memcpy(&saved, skb->cb, sizeof(saved));
 579                 kfree(saved);
 580                 dev_kfree_skb_irq(skb);
 581                 tmp--;
 582                 I802_DEBUG_INC(local->tx_status_drop);
 583         }
 584         tasklet_schedule(&local->tasklet);
 585 }
 586 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 587
 588 static void ieee80211_tasklet_handler(unsigned long data)
 589 {
 590         struct ieee80211_local *local = (struct ieee80211_local *) data;
 591         struct sk_buff *skb;
 592         struct ieee80211_rx_status rx_status;
 593         struct ieee80211_tx_status *tx_status;
 594
 595         while ((skb = skb_dequeue(&local->skb_queue)) ||
 596                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 597                 switch (skb->pkt_type) {
 598                 case IEEE80211_RX_MSG:
 599                         /* status is in skb->cb */
 600                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 601                         /* Clear skb->type in order to not confuse kernel
 602                          * netstack. */
 603                         skb->pkt_type = 0;
 604                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 605                         break;
 606                 case IEEE80211_TX_STATUS_MSG:
 607                         /* get pointer to saved status out of skb->cb */
 608                         memcpy(&tx_status, skb->cb, sizeof(tx_status));
 609                         skb->pkt_type = 0;
 610                         ieee80211_tx_status(local_to_hw(local),
 611                                             skb, tx_status);
 612                         kfree(tx_status);
 613                         break;
 614                 default: /* should never get here! */
 615                         printk(KERN_ERR "%s: Unknown message type (%d)\n",
 616                                wiphy_name(local->hw.wiphy), skb->pkt_type);
 617                         dev_kfree_skb(skb);
 618                         break;
 619                 }
 620         }
 621 }
 622
 623 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 624  * make a prepared TX frame (one that has been given to hw) to look like brand
 625  * new IEEE 802.11 frame that is ready to go through TX processing again.
 626  * Also, tx_packet_data in cb is restored from tx_control. */
 627 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 628                                       struct ieee80211_key *key,
 629                                       struct sk_buff *skb,
 630                                       struct ieee80211_tx_control *control)
 631 {
 632         int hdrlen, iv_len, mic_len;
 633         struct ieee80211_tx_packet_data *pkt_data;
 634
 635         pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
 636         pkt_data->ifindex = control->ifindex;
 637         pkt_data->flags = 0;
 638         if (control->flags & IEEE80211_TXCTL_REQ_TX_STATUS)
 639                 pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
 640         if (control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT)
 641                 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
 642         if (control->flags & IEEE80211_TXCTL_REQUEUE)
 643                 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
 644         pkt_data->queue = control->queue;
 645
 646         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 647
 648         if (!key)
 649                 goto no_key;
 650
 651         switch (key->conf.alg) {
 652         case ALG_WEP:
 653                 iv_len = WEP_IV_LEN;
 654                 mic_len = WEP_ICV_LEN;
 655                 break;
 656         case ALG_TKIP:
 657                 iv_len = TKIP_IV_LEN;
 658                 mic_len = TKIP_ICV_LEN;
 659                 break;
 660         case ALG_CCMP:
 661                 iv_len = CCMP_HDR_LEN;
 662                 mic_len = CCMP_MIC_LEN;
 663                 break;
 664         default:
 665                 goto no_key;
 666         }
 667
 668         if (skb->len >= mic_len &&
 669             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 670                 skb_trim(skb, skb->len - mic_len);
 671         if (skb->len >= iv_len && skb->len > hdrlen) {
 672                 memmove(skb->data + iv_len, skb->data, hdrlen);
 673                 skb_pull(skb, iv_len);
 674         }
 675
 676 no_key:
 677         {
 678                 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 679                 u16 fc = le16_to_cpu(hdr->frame_control);
 680                 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
 681                         fc &= ~IEEE80211_STYPE_QOS_DATA;
 682                         hdr->frame_control = cpu_to_le16(fc);
 683                         memmove(skb->data + 2, skb->data, hdrlen - 2);
 684                         skb_pull(skb, 2);
 685                 }
 686         }
 687 }
 688
 689 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
 690                          struct ieee80211_tx_status *status)
 691 {
 692         struct sk_buff *skb2;
 693         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 694         struct ieee80211_local *local = hw_to_local(hw);
 695         u16 frag, type;
 696         struct ieee80211_tx_status_rtap_hdr *rthdr;
 697         struct ieee80211_sub_if_data *sdata;
 698         int monitors;
 699
 700         if (!status) {
 701                 printk(KERN_ERR
 702                        "%s: ieee80211_tx_status called with NULL status\n",
 703                        wiphy_name(local->hw.wiphy));
 704                 dev_kfree_skb(skb);
 705                 return;
 706         }
 707
 708         if (status->excessive_retries) {
 709                 struct sta_info *sta;
 710                 sta = sta_info_get(local, hdr->addr1);
 711                 if (sta) {
 712                         if (sta->flags & WLAN_STA_PS) {
 713                                 /* The STA is in power save mode, so assume
 714                                  * that this TX packet failed because of that.
 715                                  */
 716                                 status->excessive_retries = 0;
 717                                 status->flags |= IEEE80211_TX_STATUS_TX_FILTERED;
 718                         }
 719                         sta_info_put(sta);
 720                 }
 721         }
 722
 723         if (status->flags & IEEE80211_TX_STATUS_TX_FILTERED) {
 724                 struct sta_info *sta;
 725                 sta = sta_info_get(local, hdr->addr1);
 726                 if (sta) {
 727                         sta->tx_filtered_count++;
 728
 729                         /* Clear the TX filter mask for this STA when sending
 730                          * the next packet. If the STA went to power save mode,
 731                          * this will happen when it is waking up for the next
 732                          * time. */
 733                         sta->clear_dst_mask = 1;
 734
 735                         /* TODO: Is the WLAN_STA_PS flag always set here or is
 736                          * the race between RX and TX status causing some
 737                          * packets to be filtered out before 80211.o gets an
 738                          * update for PS status? This seems to be the case, so
 739                          * no changes are likely to be needed. */
 740                         if (sta->flags & WLAN_STA_PS &&
 741                             skb_queue_len(&sta->tx_filtered) <
 742                             STA_MAX_TX_BUFFER) {
 743                                 ieee80211_remove_tx_extra(local, sta->key,
 744                                                           skb,
 745                                                           &status->control);
 746                                 skb_queue_tail(&sta->tx_filtered, skb);
 747                         } else if (!(sta->flags & WLAN_STA_PS) &&
 748                                    !(status->control.flags & IEEE80211_TXCTL_REQUEUE)) {
 749                                 /* Software retry the packet once */
 750                                 status->control.flags |= IEEE80211_TXCTL_REQUEUE;
 751                                 ieee80211_remove_tx_extra(local, sta->key,
 752                                                           skb,
 753                                                           &status->control);
 754                                 dev_queue_xmit(skb);
 755                         } else {
 756                                 if (net_ratelimit()) {
 757                                         printk(KERN_DEBUG "%s: dropped TX "
 758                                                "filtered frame queue_len=%d "
 759                                                "PS=%d @%lu\n",
 760                                                wiphy_name(local->hw.wiphy),
 761                                                skb_queue_len(
 762                                                        &sta->tx_filtered),
 763                                                !!(sta->flags & WLAN_STA_PS),
 764                                                jiffies);
 765                                 }
 766                                 dev_kfree_skb(skb);
 767                         }
 768                         sta_info_put(sta);
 769                         return;
 770                 }
 771         } else {
 772                 /* FIXME: STUPID to call this with both local and local->mdev */
 773                 rate_control_tx_status(local, local->mdev, skb, status);
 774         }
 775
 776         ieee80211_led_tx(local, 0);
 777
 778         /* SNMP counters
 779          * Fragments are passed to low-level drivers as separate skbs, so these
 780          * are actually fragments, not frames. Update frame counters only for
 781          * the first fragment of the frame. */
 782
 783         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 784         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 785
 786         if (status->flags & IEEE80211_TX_STATUS_ACK) {
 787                 if (frag == 0) {
 788                         local->dot11TransmittedFrameCount++;
 789                         if (is_multicast_ether_addr(hdr->addr1))
 790                                 local->dot11MulticastTransmittedFrameCount++;
 791                         if (status->retry_count > 0)
 792                                 local->dot11RetryCount++;
 793                         if (status->retry_count > 1)
 794                                 local->dot11MultipleRetryCount++;
 795                 }
 796
 797                 /* This counter shall be incremented for an acknowledged MPDU
 798                  * with an individual address in the address 1 field or an MPDU
 799                  * with a multicast address in the address 1 field of type Data
 800                  * or Management. */
 801                 if (!is_multicast_ether_addr(hdr->addr1) ||
 802                     type == IEEE80211_FTYPE_DATA ||
 803                     type == IEEE80211_FTYPE_MGMT)
 804                         local->dot11TransmittedFragmentCount++;
 805         } else {
 806                 if (frag == 0)
 807                         local->dot11FailedCount++;
 808         }
 809
 810         /* this was a transmitted frame, but now we want to reuse it */
 811         skb_orphan(skb);
 812
 813         if (!local->monitors) {
 814                 dev_kfree_skb(skb);
 815                 return;
 816         }
 817
 818         /* send frame to monitor interfaces now */
 819
 820         if (skb_headroom(skb) < sizeof(*rthdr)) {
 821                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 822                 dev_kfree_skb(skb);
 823                 return;
 824         }
 825
 826         rthdr = (struct ieee80211_tx_status_rtap_hdr*)
 827                                 skb_push(skb, sizeof(*rthdr));
 828
 829         memset(rthdr, 0, sizeof(*rthdr));
 830         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 831         rthdr->hdr.it_present =
 832                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 833                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
 834
 835         if (!(status->flags & IEEE80211_TX_STATUS_ACK) &&
 836             !is_multicast_ether_addr(hdr->addr1))
 837                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 838
 839         if ((status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) &&
 840             (status->control.flags & IEEE80211_TXCTL_USE_CTS_PROTECT))
 841                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 842         else if (status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS)
 843                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 844
 845         rthdr->data_retries = status->retry_count;
 846
 847         rcu_read_lock();
 848         monitors = local->monitors;
 849         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 850                 /*
 851                  * Using the monitors counter is possibly racy, but
 852                  * if the value is wrong we simply either clone the skb
 853                  * once too much or forget sending it to one monitor iface
 854                  * The latter case isn't nice but fixing the race is much
 855                  * more complicated.
 856                  */
 857                 if (!monitors || !skb)
 858                         goto out;
 859
 860                 if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
 861                         if (!netif_running(sdata->dev))
 862                                 continue;
 863                         monitors--;
 864                         if (monitors)
 865                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 866                         else
 867                                 skb2 = NULL;
 868                         skb->dev = sdata->dev;
 869                         /* XXX: is this sufficient for BPF? */
 870                         skb_set_mac_header(skb, 0);
 871                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 872                         skb->pkt_type = PACKET_OTHERHOST;
 873                         skb->protocol = htons(ETH_P_802_2);
 874                         memset(skb->cb, 0, sizeof(skb->cb));
 875                         netif_rx(skb);
 876                         skb = skb2;
 877                 }
 878         }
 879  out:
 880         rcu_read_unlock();
 881         if (skb)
 882                 dev_kfree_skb(skb);
 883 }
 884 EXPORT_SYMBOL(ieee80211_tx_status);
 885
 886 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 887                                         const struct ieee80211_ops *ops)
 888 {
 889         struct net_device *mdev;
 890         struct ieee80211_local *local;
 891         struct ieee80211_sub_if_data *sdata;
 892         int priv_size;
 893         struct wiphy *wiphy;
 894
 895         /* Ensure 32-byte alignment of our private data and hw private data.
 896          * We use the wiphy priv data for both our ieee80211_local and for
 897          * the driver's private data
 898          *
 899          * In memory it'll be like this:
 900          *
 901          * +-------------------------+
 902          * | struct wiphy           |
 903          * +-------------------------+
 904          * | struct ieee80211_local  |
 905          * +-------------------------+
 906          * | driver's private data   |
 907          * +-------------------------+
 908          *
 909          */
 910         priv_size = ((sizeof(struct ieee80211_local) +
 911                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
 912                     priv_data_len;
 913
 914         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 915
 916         if (!wiphy)
 917                 return NULL;
 918
 919         wiphy->privid = mac80211_wiphy_privid;
 920
 921         local = wiphy_priv(wiphy);
 922         local->hw.wiphy = wiphy;
 923
 924         local->hw.priv = (char *)local +
 925                          ((sizeof(struct ieee80211_local) +
 926                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
 927
 928         BUG_ON(!ops->tx);
 929         BUG_ON(!ops->start);
 930         BUG_ON(!ops->stop);
 931         BUG_ON(!ops->config);
 932         BUG_ON(!ops->add_interface);
 933         BUG_ON(!ops->remove_interface);
 934         BUG_ON(!ops->configure_filter);
 935         local->ops = ops;
 936
 937         /* for now, mdev needs sub_if_data :/ */
 938         mdev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
 939                             "wmaster%d", ether_setup);
 940         if (!mdev) {
 941                 wiphy_free(wiphy);
 942                 return NULL;
 943         }
 944
 945         sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
 946         mdev->ieee80211_ptr = &sdata->wdev;
 947         sdata->wdev.wiphy = wiphy;
 948
 949         local->hw.queues = 1; /* default */
 950
 951         local->mdev = mdev;
 952         local->rx_pre_handlers = ieee80211_rx_pre_handlers;
 953         local->rx_handlers = ieee80211_rx_handlers;
 954         local->tx_handlers = ieee80211_tx_handlers;
 955
 956         local->bridge_packets = 1;
 957
 958         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
 959         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
 960         local->short_retry_limit = 7;
 961         local->long_retry_limit = 4;
 962         local->hw.conf.radio_enabled = 1;
 963
 964         local->enabled_modes = ~0;
 965
 966         INIT_LIST_HEAD(&local->modes_list);
 967
 968         INIT_LIST_HEAD(&local->interfaces);
 969
 970         INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
 971         ieee80211_rx_bss_list_init(mdev);
 972
 973         sta_info_init(local);
 974
 975         mdev->hard_start_xmit = ieee80211_master_start_xmit;
 976         mdev->open = ieee80211_master_open;
 977         mdev->stop = ieee80211_master_stop;
 978         mdev->type = ARPHRD_IEEE80211;
 979         mdev->hard_header_parse = header_parse_80211;
 980         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
 981
 982         sdata->type = IEEE80211_IF_TYPE_AP;
 983         sdata->dev = mdev;
 984         sdata->local = local;
 985         sdata->u.ap.force_unicast_rateidx = -1;
 986         sdata->u.ap.max_ratectrl_rateidx = -1;
 987         ieee80211_if_sdata_init(sdata);
 988         /* no RCU needed since we're still during init phase */
 989         list_add_tail(&sdata->list, &local->interfaces);
 990
 991         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
 992                      (unsigned long)local);
 993         tasklet_disable(&local->tx_pending_tasklet);
 994
 995         tasklet_init(&local->tasklet,
 996                      ieee80211_tasklet_handler,
 997                      (unsigned long) local);
 998         tasklet_disable(&local->tasklet);
 999
1000         skb_queue_head_init(&local->skb_queue);
1001         skb_queue_head_init(&local->skb_queue_unreliable);
1002
1003         return local_to_hw(local);
1004 }
1005 EXPORT_SYMBOL(ieee80211_alloc_hw);
1006
1007 int ieee80211_register_hw(struct ieee80211_hw *hw)
1008 {
1009         struct ieee80211_local *local = hw_to_local(hw);
1010         const char *name;
1011         int result;
1012
1013         result = wiphy_register(local->hw.wiphy);
1014         if (result < 0)
1015                 return result;
1016
1017         name = wiphy_dev(local->hw.wiphy)->driver->name;
1018         local->hw.workqueue = create_singlethread_workqueue(name);
1019         if (!local->hw.workqueue) {
1020                 result = -ENOMEM;
1021                 goto fail_workqueue;
1022         }
1023
1024         /*
1025          * The hardware needs headroom for sending the frame,
1026          * and we need some headroom for passing the frame to monitor
1027          * interfaces, but never both at the same time.
1028          */
1029         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1030                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
1031
1032         debugfs_hw_add(local);
1033
1034         local->hw.conf.beacon_int = 1000;
1035
1036         local->wstats_flags |= local->hw.max_rssi ?
1037                                IW_QUAL_LEVEL_UPDATED : IW_QUAL_LEVEL_INVALID;
1038         local->wstats_flags |= local->hw.max_signal ?
1039                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1040         local->wstats_flags |= local->hw.max_noise ?
1041                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1042         if (local->hw.max_rssi < 0 || local->hw.max_noise < 0)
1043                 local->wstats_flags |= IW_QUAL_DBM;
1044
1045         result = sta_info_start(local);
1046         if (result < 0)
1047                 goto fail_sta_info;
1048
1049         rtnl_lock();
1050         result = dev_alloc_name(local->mdev, local->mdev->name);
1051         if (result < 0)
1052                 goto fail_dev;
1053
1054         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1055         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1056
1057         result = register_netdevice(local->mdev);
1058         if (result < 0)
1059                 goto fail_dev;
1060
1061         ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1062         ieee80211_if_set_type(local->mdev, IEEE80211_IF_TYPE_AP);
1063
1064         result = ieee80211_init_rate_ctrl_alg(local, NULL);
1065         if (result < 0) {
1066                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1067                        "algorithm\n", wiphy_name(local->hw.wiphy));
1068                 goto fail_rate;
1069         }
1070
1071         result = ieee80211_wep_init(local);
1072
1073         if (result < 0) {
1074                 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1075                        wiphy_name(local->hw.wiphy));
1076                 goto fail_wep;
1077         }
1078
1079         ieee80211_install_qdisc(local->mdev);
1080
1081         /* add one default STA interface */
1082         result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
1083                                   IEEE80211_IF_TYPE_STA);
1084         if (result)
1085                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1086                        wiphy_name(local->hw.wiphy));
1087
1088         local->reg_state = IEEE80211_DEV_REGISTERED;
1089         rtnl_unlock();
1090
1091         ieee80211_led_init(local);
1092
1093         return 0;
1094
1095 fail_wep:
1096         rate_control_deinitialize(local);
1097 fail_rate:
1098         ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1099         unregister_netdevice(local->mdev);
1100 fail_dev:
1101         rtnl_unlock();
1102         sta_info_stop(local);
1103 fail_sta_info:
1104         debugfs_hw_del(local);
1105         destroy_workqueue(local->hw.workqueue);
1106 fail_workqueue:
1107         wiphy_unregister(local->hw.wiphy);
1108         return result;
1109 }
1110 EXPORT_SYMBOL(ieee80211_register_hw);
1111
1112 int ieee80211_register_hwmode(struct ieee80211_hw *hw,
1113                               struct ieee80211_hw_mode *mode)
1114 {
1115         struct ieee80211_local *local = hw_to_local(hw);
1116         struct ieee80211_rate *rate;
1117         int i;
1118
1119         INIT_LIST_HEAD(&mode->list);
1120         list_add_tail(&mode->list, &local->modes_list);
1121
1122         local->hw_modes |= (1 << mode->mode);
1123         for (i = 0; i < mode->num_rates; i++) {
1124                 rate = &(mode->rates[i]);
1125                 rate->rate_inv = CHAN_UTIL_RATE_LCM / rate->rate;
1126         }
1127         ieee80211_prepare_rates(local, mode);
1128
1129         if (!local->oper_hw_mode) {
1130                 /* Default to this mode */
1131                 local->hw.conf.phymode = mode->mode;
1132                 local->oper_hw_mode = local->scan_hw_mode = mode;
1133                 local->oper_channel = local->scan_channel = &mode->channels[0];
1134                 local->hw.conf.mode = local->oper_hw_mode;
1135                 local->hw.conf.chan = local->oper_channel;
1136         }
1137
1138         if (!(hw->flags & IEEE80211_HW_DEFAULT_REG_DOMAIN_CONFIGURED))
1139                 ieee80211_set_default_regdomain(mode);
1140
1141         return 0;
1142 }
1143 EXPORT_SYMBOL(ieee80211_register_hwmode);
1144
1145 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1146 {
1147         struct ieee80211_local *local = hw_to_local(hw);
1148         struct ieee80211_sub_if_data *sdata, *tmp;
1149         int i;
1150
1151         tasklet_kill(&local->tx_pending_tasklet);
1152         tasklet_kill(&local->tasklet);
1153
1154         rtnl_lock();
1155
1156         BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
1157
1158         local->reg_state = IEEE80211_DEV_UNREGISTERED;
1159
1160         /*
1161          * At this point, interface list manipulations are fine
1162          * because the driver cannot be handing us frames any
1163          * more and the tasklet is killed.
1164          */
1165
1166         /*
1167          * First, we remove all non-master interfaces. Do this because they
1168          * may have bss pointer dependency on the master, and when we free
1169          * the master these would be freed as well, breaking our list
1170          * iteration completely.
1171          */
1172         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1173                 if (sdata->dev == local->mdev)
1174                         continue;
1175                 list_del(&sdata->list);
1176                 __ieee80211_if_del(local, sdata);
1177         }
1178
1179         /* then, finally, remove the master interface */
1180         __ieee80211_if_del(local, IEEE80211_DEV_TO_SUB_IF(local->mdev));
1181
1182         rtnl_unlock();
1183
1184         ieee80211_rx_bss_list_deinit(local->mdev);
1185         ieee80211_clear_tx_pending(local);
1186         sta_info_stop(local);
1187         rate_control_deinitialize(local);
1188         debugfs_hw_del(local);
1189
1190         for (i = 0; i < NUM_IEEE80211_MODES; i++) {
1191                 kfree(local->supp_rates[i]);
1192                 kfree(local->basic_rates[i]);
1193         }
1194
1195         if (skb_queue_len(&local->skb_queue)
1196                         || skb_queue_len(&local->skb_queue_unreliable))
1197                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1198                        wiphy_name(local->hw.wiphy));
1199         skb_queue_purge(&local->skb_queue);
1200         skb_queue_purge(&local->skb_queue_unreliable);
1201
1202         destroy_workqueue(local->hw.workqueue);
1203         wiphy_unregister(local->hw.wiphy);
1204         ieee80211_wep_free(local);
1205         ieee80211_led_exit(local);
1206 }
1207 EXPORT_SYMBOL(ieee80211_unregister_hw);
1208
1209 void ieee80211_free_hw(struct ieee80211_hw *hw)
1210 {
1211         struct ieee80211_local *local = hw_to_local(hw);
1212
1213         ieee80211_if_free(local->mdev);
1214         wiphy_free(local->hw.wiphy);
1215 }
1216 EXPORT_SYMBOL(ieee80211_free_hw);
1217
1218 static int __init ieee80211_init(void)
1219 {
1220         struct sk_buff *skb;
1221         int ret;
1222
1223         BUILD_BUG_ON(sizeof(struct ieee80211_tx_packet_data) > sizeof(skb->cb));
1224
1225         ret = ieee80211_wme_register();
1226         if (ret) {
1227                 printk(KERN_DEBUG "ieee80211_init: failed to "
1228                        "initialize WME (err=%d)\n", ret);
1229                 return ret;
1230         }
1231
1232         ieee80211_debugfs_netdev_init();
1233         ieee80211_regdomain_init();
1234
1235         return 0;
1236 }
1237
1238 static void __exit ieee80211_exit(void)
1239 {
1240         ieee80211_wme_unregister();
1241         ieee80211_debugfs_netdev_exit();
1242 }
1243
1244
1245 subsys_initcall(ieee80211_init);
1246 module_exit(ieee80211_exit);
1247
1248 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1249 MODULE_LICENSE("GPL");