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         /*
 271          * set_multicast_list will be invoked by the networking core
 272          * which will check whether any increments here were done in
 273          * error and sync them down to the hardware as filter flags.
 274          */
 275         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 276                 atomic_inc(&local->iff_allmultis);
 277
 278         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 279                 atomic_inc(&local->iff_promiscs);
 280
 281         local->open_count++;
 282
 283         netif_start_queue(dev);
 284
 285         return 0;
 286 }
 287
 288 static int ieee80211_stop(struct net_device *dev)
 289 {
 290         struct ieee80211_sub_if_data *sdata;
 291         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 292         struct ieee80211_if_init_conf conf;
 293
 294         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 295
 296         netif_stop_queue(dev);
 297
 298         /*
 299          * Don't count this interface for promisc/allmulti while it
 300          * is down. dev_mc_unsync() will invoke set_multicast_list
 301          * on the master interface which will sync these down to the
 302          * hardware as filter flags.
 303          */
 304         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 305                 atomic_dec(&local->iff_allmultis);
 306
 307         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 308                 atomic_dec(&local->iff_promiscs);
 309
 310         dev_mc_unsync(local->mdev, dev);
 311
 312         /* down all dependent devices, that is VLANs */
 313         if (sdata->type == IEEE80211_IF_TYPE_AP) {
 314                 struct ieee80211_sub_if_data *vlan, *tmp;
 315
 316                 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
 317                                          u.vlan.list)
 318                         dev_close(vlan->dev);
 319                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 320         }
 321
 322         local->open_count--;
 323
 324         switch (sdata->type) {
 325         case IEEE80211_IF_TYPE_VLAN:
 326                 list_del(&sdata->u.vlan.list);
 327                 sdata->u.vlan.ap = NULL;
 328                 /* no need to tell driver */
 329                 break;
 330         case IEEE80211_IF_TYPE_MNTR:
 331                 local->monitors--;
 332                 if (local->monitors == 0) {
 333                         netif_tx_lock_bh(local->mdev);
 334                         ieee80211_configure_filter(local);
 335                         netif_tx_unlock_bh(local->mdev);
 336
 337                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 338                         ieee80211_hw_config(local);
 339                 }
 340                 break;
 341         case IEEE80211_IF_TYPE_STA:
 342         case IEEE80211_IF_TYPE_IBSS:
 343                 sdata->u.sta.state = IEEE80211_DISABLED;
 344                 del_timer_sync(&sdata->u.sta.timer);
 345                 /*
 346                  * When we get here, the interface is marked down.
 347                  * Call synchronize_rcu() to wait for the RX path
 348                  * should it be using the interface and enqueuing
 349                  * frames at this very time on another CPU.
 350                  */
 351                 synchronize_rcu();
 352                 skb_queue_purge(&sdata->u.sta.skb_queue);
 353
 354                 if (!local->ops->hw_scan &&
 355                     local->scan_dev == sdata->dev) {
 356                         local->sta_scanning = 0;
 357                         cancel_delayed_work(&local->scan_work);
 358                 }
 359                 flush_workqueue(local->hw.workqueue);
 360                 /* fall through */
 361         default:
 362                 conf.if_id = dev->ifindex;
 363                 conf.type = sdata->type;
 364                 conf.mac_addr = dev->dev_addr;
 365                 /* disable all keys for as long as this netdev is down */
 366                 ieee80211_disable_keys(sdata);
 367                 local->ops->remove_interface(local_to_hw(local), &conf);
 368         }
 369
 370         if (local->open_count == 0) {
 371                 if (netif_running(local->mdev))
 372                         dev_close(local->mdev);
 373
 374                 if (local->ops->stop)
 375                         local->ops->stop(local_to_hw(local));
 376
 377                 tasklet_disable(&local->tx_pending_tasklet);
 378                 tasklet_disable(&local->tasklet);
 379         }
 380
 381         return 0;
 382 }
 383
 384 static void ieee80211_set_multicast_list(struct net_device *dev)
 385 {
 386         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 387         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 388         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 389
 390         allmulti = !!(dev->flags & IFF_ALLMULTI);
 391         promisc = !!(dev->flags & IFF_PROMISC);
 392         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 393         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 394
 395         if (allmulti != sdata_allmulti) {
 396                 if (dev->flags & IFF_ALLMULTI)
 397                         atomic_inc(&local->iff_allmultis);
 398                 else
 399                         atomic_dec(&local->iff_allmultis);
 400                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 401         }
 402
 403         if (promisc != sdata_promisc) {
 404                 if (dev->flags & IFF_PROMISC)
 405                         atomic_inc(&local->iff_promiscs);
 406                 else
 407                         atomic_dec(&local->iff_promiscs);
 408                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 409         }
 410
 411         dev_mc_sync(local->mdev, dev);
 412 }
 413
 414 static const struct header_ops ieee80211_header_ops = {
 415         .create         = eth_header,
 416         .parse          = header_parse_80211,
 417         .rebuild        = eth_rebuild_header,
 418         .cache          = eth_header_cache,
 419         .cache_update   = eth_header_cache_update,
 420 };
 421
 422 /* Must not be called for mdev */
 423 void ieee80211_if_setup(struct net_device *dev)
 424 {
 425         ether_setup(dev);
 426         dev->header_ops = &ieee80211_header_ops;
 427         dev->hard_start_xmit = ieee80211_subif_start_xmit;
 428         dev->wireless_handlers = &ieee80211_iw_handler_def;
 429         dev->set_multicast_list = ieee80211_set_multicast_list;
 430         dev->change_mtu = ieee80211_change_mtu;
 431         dev->open = ieee80211_open;
 432         dev->stop = ieee80211_stop;
 433         dev->destructor = ieee80211_if_free;
 434 }
 435
 436 /* WDS specialties */
 437
 438 int ieee80211_if_update_wds(struct net_device *dev, u8 *remote_addr)
 439 {
 440         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 441         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 442         struct sta_info *sta;
 443         DECLARE_MAC_BUF(mac);
 444
 445         if (compare_ether_addr(remote_addr, sdata->u.wds.remote_addr) == 0)
 446                 return 0;
 447
 448         /* Create STA entry for the new peer */
 449         sta = sta_info_add(local, dev, remote_addr, GFP_KERNEL);
 450         if (!sta)
 451                 return -ENOMEM;
 452         sta_info_put(sta);
 453
 454         /* Remove STA entry for the old peer */
 455         sta = sta_info_get(local, sdata->u.wds.remote_addr);
 456         if (sta) {
 457                 sta_info_free(sta);
 458                 sta_info_put(sta);
 459         } else {
 460                 printk(KERN_DEBUG "%s: could not find STA entry for WDS link "
 461                        "peer %s\n",
 462                        dev->name, print_mac(mac, sdata->u.wds.remote_addr));
 463         }
 464
 465         /* Update WDS link data */
 466         memcpy(&sdata->u.wds.remote_addr, remote_addr, ETH_ALEN);
 467
 468         return 0;
 469 }
 470
 471 /* everything else */
 472
 473 static int __ieee80211_if_config(struct net_device *dev,
 474                                  struct sk_buff *beacon,
 475                                  struct ieee80211_tx_control *control)
 476 {
 477         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 478         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 479         struct ieee80211_if_conf conf;
 480
 481         if (!local->ops->config_interface || !netif_running(dev))
 482                 return 0;
 483
 484         memset(&conf, 0, sizeof(conf));
 485         conf.type = sdata->type;
 486         if (sdata->type == IEEE80211_IF_TYPE_STA ||
 487             sdata->type == IEEE80211_IF_TYPE_IBSS) {
 488                 conf.bssid = sdata->u.sta.bssid;
 489                 conf.ssid = sdata->u.sta.ssid;
 490                 conf.ssid_len = sdata->u.sta.ssid_len;
 491         } else if (sdata->type == IEEE80211_IF_TYPE_AP) {
 492                 conf.ssid = sdata->u.ap.ssid;
 493                 conf.ssid_len = sdata->u.ap.ssid_len;
 494                 conf.beacon = beacon;
 495                 conf.beacon_control = control;
 496         }
 497         return local->ops->config_interface(local_to_hw(local),
 498                                            dev->ifindex, &conf);
 499 }
 500
 501 int ieee80211_if_config(struct net_device *dev)
 502 {
 503         return __ieee80211_if_config(dev, NULL, NULL);
 504 }
 505
 506 int ieee80211_if_config_beacon(struct net_device *dev)
 507 {
 508         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 509         struct ieee80211_tx_control control;
 510         struct sk_buff *skb;
 511
 512         if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
 513                 return 0;
 514         skb = ieee80211_beacon_get(local_to_hw(local), dev->ifindex, &control);
 515         if (!skb)
 516                 return -ENOMEM;
 517         return __ieee80211_if_config(dev, skb, &control);
 518 }
 519
 520 int ieee80211_hw_config(struct ieee80211_local *local)
 521 {
 522         struct ieee80211_hw_mode *mode;
 523         struct ieee80211_channel *chan;
 524         int ret = 0;
 525
 526         if (local->sta_scanning) {
 527                 chan = local->scan_channel;
 528                 mode = local->scan_hw_mode;
 529         } else {
 530                 chan = local->oper_channel;
 531                 mode = local->oper_hw_mode;
 532         }
 533
 534         local->hw.conf.channel = chan->chan;
 535         local->hw.conf.channel_val = chan->val;
 536         if (!local->hw.conf.power_level) {
 537                 local->hw.conf.power_level = chan->power_level;
 538         } else {
 539                 local->hw.conf.power_level = min(chan->power_level,
 540                                                  local->hw.conf.power_level);
 541         }
 542         local->hw.conf.freq = chan->freq;
 543         local->hw.conf.phymode = mode->mode;
 544         local->hw.conf.antenna_max = chan->antenna_max;
 545         local->hw.conf.chan = chan;
 546         local->hw.conf.mode = mode;
 547
 548 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 549         printk(KERN_DEBUG "HW CONFIG: channel=%d freq=%d "
 550                "phymode=%d\n", local->hw.conf.channel, local->hw.conf.freq,
 551                local->hw.conf.phymode);
 552 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 553
 554         if (local->open_count)
 555                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
 556
 557         return ret;
 558 }
 559
 560 void ieee80211_erp_info_change_notify(struct net_device *dev, u8 changes)
 561 {
 562         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 563         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 564         if (local->ops->erp_ie_changed)
 565                 local->ops->erp_ie_changed(local_to_hw(local), changes,
 566                         !!(sdata->flags & IEEE80211_SDATA_USE_PROTECTION),
 567                         !(sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE));
 568 }
 569
 570 void ieee80211_reset_erp_info(struct net_device *dev)
 571 {
 572         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 573
 574         sdata->flags &= ~(IEEE80211_SDATA_USE_PROTECTION |
 575                         IEEE80211_SDATA_SHORT_PREAMBLE);
 576         ieee80211_erp_info_change_notify(dev,
 577                                          IEEE80211_ERP_CHANGE_PROTECTION |
 578                                          IEEE80211_ERP_CHANGE_PREAMBLE);
 579 }
 580
 581 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 582                                  struct sk_buff *skb,
 583                                  struct ieee80211_tx_status *status)
 584 {
 585         struct ieee80211_local *local = hw_to_local(hw);
 586         struct ieee80211_tx_status *saved;
 587         int tmp;
 588
 589         skb->dev = local->mdev;
 590         saved = kmalloc(sizeof(struct ieee80211_tx_status), GFP_ATOMIC);
 591         if (unlikely(!saved)) {
 592                 if (net_ratelimit())
 593                         printk(KERN_WARNING "%s: Not enough memory, "
 594                                "dropping tx status", skb->dev->name);
 595                 /* should be dev_kfree_skb_irq, but due to this function being
 596                  * named _irqsafe instead of just _irq we can't be sure that
 597                  * people won't call it from non-irq contexts */
 598                 dev_kfree_skb_any(skb);
 599                 return;
 600         }
 601         memcpy(saved, status, sizeof(struct ieee80211_tx_status));
 602         /* copy pointer to saved status into skb->cb for use by tasklet */
 603         memcpy(skb->cb, &saved, sizeof(saved));
 604
 605         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 606         skb_queue_tail(status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS ?
 607                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 608         tmp = skb_queue_len(&local->skb_queue) +
 609                 skb_queue_len(&local->skb_queue_unreliable);
 610         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 611                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 612                 memcpy(&saved, skb->cb, sizeof(saved));
 613                 kfree(saved);
 614                 dev_kfree_skb_irq(skb);
 615                 tmp--;
 616                 I802_DEBUG_INC(local->tx_status_drop);
 617         }
 618         tasklet_schedule(&local->tasklet);
 619 }
 620 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 621
 622 static void ieee80211_tasklet_handler(unsigned long data)
 623 {
 624         struct ieee80211_local *local = (struct ieee80211_local *) data;
 625         struct sk_buff *skb;
 626         struct ieee80211_rx_status rx_status;
 627         struct ieee80211_tx_status *tx_status;
 628
 629         while ((skb = skb_dequeue(&local->skb_queue)) ||
 630                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 631                 switch (skb->pkt_type) {
 632                 case IEEE80211_RX_MSG:
 633                         /* status is in skb->cb */
 634                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 635                         /* Clear skb->type in order to not confuse kernel
 636                          * netstack. */
 637                         skb->pkt_type = 0;
 638                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 639                         break;
 640                 case IEEE80211_TX_STATUS_MSG:
 641                         /* get pointer to saved status out of skb->cb */
 642                         memcpy(&tx_status, skb->cb, sizeof(tx_status));
 643                         skb->pkt_type = 0;
 644                         ieee80211_tx_status(local_to_hw(local),
 645                                             skb, tx_status);
 646                         kfree(tx_status);
 647                         break;
 648                 default: /* should never get here! */
 649                         printk(KERN_ERR "%s: Unknown message type (%d)\n",
 650                                wiphy_name(local->hw.wiphy), skb->pkt_type);
 651                         dev_kfree_skb(skb);
 652                         break;
 653                 }
 654         }
 655 }
 656
 657 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 658  * make a prepared TX frame (one that has been given to hw) to look like brand
 659  * new IEEE 802.11 frame that is ready to go through TX processing again.
 660  * Also, tx_packet_data in cb is restored from tx_control. */
 661 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 662                                       struct ieee80211_key *key,
 663                                       struct sk_buff *skb,
 664                                       struct ieee80211_tx_control *control)
 665 {
 666         int hdrlen, iv_len, mic_len;
 667         struct ieee80211_tx_packet_data *pkt_data;
 668
 669         pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
 670         pkt_data->ifindex = control->ifindex;
 671         pkt_data->flags = 0;
 672         if (control->flags & IEEE80211_TXCTL_REQ_TX_STATUS)
 673                 pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
 674         if (control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT)
 675                 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
 676         if (control->flags & IEEE80211_TXCTL_REQUEUE)
 677                 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
 678         pkt_data->queue = control->queue;
 679
 680         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 681
 682         if (!key)
 683                 goto no_key;
 684
 685         switch (key->conf.alg) {
 686         case ALG_WEP:
 687                 iv_len = WEP_IV_LEN;
 688                 mic_len = WEP_ICV_LEN;
 689                 break;
 690         case ALG_TKIP:
 691                 iv_len = TKIP_IV_LEN;
 692                 mic_len = TKIP_ICV_LEN;
 693                 break;
 694         case ALG_CCMP:
 695                 iv_len = CCMP_HDR_LEN;
 696                 mic_len = CCMP_MIC_LEN;
 697                 break;
 698         default:
 699                 goto no_key;
 700         }
 701
 702         if (skb->len >= mic_len &&
 703             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 704                 skb_trim(skb, skb->len - mic_len);
 705         if (skb->len >= iv_len && skb->len > hdrlen) {
 706                 memmove(skb->data + iv_len, skb->data, hdrlen);
 707                 skb_pull(skb, iv_len);
 708         }
 709
 710 no_key:
 711         {
 712                 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 713                 u16 fc = le16_to_cpu(hdr->frame_control);
 714                 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
 715                         fc &= ~IEEE80211_STYPE_QOS_DATA;
 716                         hdr->frame_control = cpu_to_le16(fc);
 717                         memmove(skb->data + 2, skb->data, hdrlen - 2);
 718                         skb_pull(skb, 2);
 719                 }
 720         }
 721 }
 722
 723 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
 724                          struct ieee80211_tx_status *status)
 725 {
 726         struct sk_buff *skb2;
 727         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 728         struct ieee80211_local *local = hw_to_local(hw);
 729         u16 frag, type;
 730         struct ieee80211_tx_status_rtap_hdr *rthdr;
 731         struct ieee80211_sub_if_data *sdata;
 732         int monitors;
 733
 734         if (!status) {
 735                 printk(KERN_ERR
 736                        "%s: ieee80211_tx_status called with NULL status\n",
 737                        wiphy_name(local->hw.wiphy));
 738                 dev_kfree_skb(skb);
 739                 return;
 740         }
 741
 742         if (status->excessive_retries) {
 743                 struct sta_info *sta;
 744                 sta = sta_info_get(local, hdr->addr1);
 745                 if (sta) {
 746                         if (sta->flags & WLAN_STA_PS) {
 747                                 /* The STA is in power save mode, so assume
 748                                  * that this TX packet failed because of that.
 749                                  */
 750                                 status->excessive_retries = 0;
 751                                 status->flags |= IEEE80211_TX_STATUS_TX_FILTERED;
 752                         }
 753                         sta_info_put(sta);
 754                 }
 755         }
 756
 757         if (status->flags & IEEE80211_TX_STATUS_TX_FILTERED) {
 758                 struct sta_info *sta;
 759                 sta = sta_info_get(local, hdr->addr1);
 760                 if (sta) {
 761                         sta->tx_filtered_count++;
 762
 763                         /* Clear the TX filter mask for this STA when sending
 764                          * the next packet. If the STA went to power save mode,
 765                          * this will happen when it is waking up for the next
 766                          * time. */
 767                         sta->clear_dst_mask = 1;
 768
 769                         /* TODO: Is the WLAN_STA_PS flag always set here or is
 770                          * the race between RX and TX status causing some
 771                          * packets to be filtered out before 80211.o gets an
 772                          * update for PS status? This seems to be the case, so
 773                          * no changes are likely to be needed. */
 774                         if (sta->flags & WLAN_STA_PS &&
 775                             skb_queue_len(&sta->tx_filtered) <
 776                             STA_MAX_TX_BUFFER) {
 777                                 ieee80211_remove_tx_extra(local, sta->key,
 778                                                           skb,
 779                                                           &status->control);
 780                                 skb_queue_tail(&sta->tx_filtered, skb);
 781                         } else if (!(sta->flags & WLAN_STA_PS) &&
 782                                    !(status->control.flags & IEEE80211_TXCTL_REQUEUE)) {
 783                                 /* Software retry the packet once */
 784                                 status->control.flags |= IEEE80211_TXCTL_REQUEUE;
 785                                 ieee80211_remove_tx_extra(local, sta->key,
 786                                                           skb,
 787                                                           &status->control);
 788                                 dev_queue_xmit(skb);
 789                         } else {
 790                                 if (net_ratelimit()) {
 791                                         printk(KERN_DEBUG "%s: dropped TX "
 792                                                "filtered frame queue_len=%d "
 793                                                "PS=%d @%lu\n",
 794                                                wiphy_name(local->hw.wiphy),
 795                                                skb_queue_len(
 796                                                        &sta->tx_filtered),
 797                                                !!(sta->flags & WLAN_STA_PS),
 798                                                jiffies);
 799                                 }
 800                                 dev_kfree_skb(skb);
 801                         }
 802                         sta_info_put(sta);
 803                         return;
 804                 }
 805         } else {
 806                 /* FIXME: STUPID to call this with both local and local->mdev */
 807                 rate_control_tx_status(local, local->mdev, skb, status);
 808         }
 809
 810         ieee80211_led_tx(local, 0);
 811
 812         /* SNMP counters
 813          * Fragments are passed to low-level drivers as separate skbs, so these
 814          * are actually fragments, not frames. Update frame counters only for
 815          * the first fragment of the frame. */
 816
 817         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 818         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 819
 820         if (status->flags & IEEE80211_TX_STATUS_ACK) {
 821                 if (frag == 0) {
 822                         local->dot11TransmittedFrameCount++;
 823                         if (is_multicast_ether_addr(hdr->addr1))
 824                                 local->dot11MulticastTransmittedFrameCount++;
 825                         if (status->retry_count > 0)
 826                                 local->dot11RetryCount++;
 827                         if (status->retry_count > 1)
 828                                 local->dot11MultipleRetryCount++;
 829                 }
 830
 831                 /* This counter shall be incremented for an acknowledged MPDU
 832                  * with an individual address in the address 1 field or an MPDU
 833                  * with a multicast address in the address 1 field of type Data
 834                  * or Management. */
 835                 if (!is_multicast_ether_addr(hdr->addr1) ||
 836                     type == IEEE80211_FTYPE_DATA ||
 837                     type == IEEE80211_FTYPE_MGMT)
 838                         local->dot11TransmittedFragmentCount++;
 839         } else {
 840                 if (frag == 0)
 841                         local->dot11FailedCount++;
 842         }
 843
 844         /* this was a transmitted frame, but now we want to reuse it */
 845         skb_orphan(skb);
 846
 847         if (!local->monitors) {
 848                 dev_kfree_skb(skb);
 849                 return;
 850         }
 851
 852         /* send frame to monitor interfaces now */
 853
 854         if (skb_headroom(skb) < sizeof(*rthdr)) {
 855                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 856                 dev_kfree_skb(skb);
 857                 return;
 858         }
 859
 860         rthdr = (struct ieee80211_tx_status_rtap_hdr*)
 861                                 skb_push(skb, sizeof(*rthdr));
 862
 863         memset(rthdr, 0, sizeof(*rthdr));
 864         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 865         rthdr->hdr.it_present =
 866                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 867                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
 868
 869         if (!(status->flags & IEEE80211_TX_STATUS_ACK) &&
 870             !is_multicast_ether_addr(hdr->addr1))
 871                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 872
 873         if ((status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) &&
 874             (status->control.flags & IEEE80211_TXCTL_USE_CTS_PROTECT))
 875                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 876         else if (status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS)
 877                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 878
 879         rthdr->data_retries = status->retry_count;
 880
 881         rcu_read_lock();
 882         monitors = local->monitors;
 883         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 884                 /*
 885                  * Using the monitors counter is possibly racy, but
 886                  * if the value is wrong we simply either clone the skb
 887                  * once too much or forget sending it to one monitor iface
 888                  * The latter case isn't nice but fixing the race is much
 889                  * more complicated.
 890                  */
 891                 if (!monitors || !skb)
 892                         goto out;
 893
 894                 if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
 895                         if (!netif_running(sdata->dev))
 896                                 continue;
 897                         monitors--;
 898                         if (monitors)
 899                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 900                         else
 901                                 skb2 = NULL;
 902                         skb->dev = sdata->dev;
 903                         /* XXX: is this sufficient for BPF? */
 904                         skb_set_mac_header(skb, 0);
 905                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 906                         skb->pkt_type = PACKET_OTHERHOST;
 907                         skb->protocol = htons(ETH_P_802_2);
 908                         memset(skb->cb, 0, sizeof(skb->cb));
 909                         netif_rx(skb);
 910                         skb = skb2;
 911                 }
 912         }
 913  out:
 914         rcu_read_unlock();
 915         if (skb)
 916                 dev_kfree_skb(skb);
 917 }
 918 EXPORT_SYMBOL(ieee80211_tx_status);
 919
 920 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 921                                         const struct ieee80211_ops *ops)
 922 {
 923         struct net_device *mdev;
 924         struct ieee80211_local *local;
 925         struct ieee80211_sub_if_data *sdata;
 926         int priv_size;
 927         struct wiphy *wiphy;
 928
 929         /* Ensure 32-byte alignment of our private data and hw private data.
 930          * We use the wiphy priv data for both our ieee80211_local and for
 931          * the driver's private data
 932          *
 933          * In memory it'll be like this:
 934          *
 935          * +-------------------------+
 936          * | struct wiphy           |
 937          * +-------------------------+
 938          * | struct ieee80211_local  |
 939          * +-------------------------+
 940          * | driver's private data   |
 941          * +-------------------------+
 942          *
 943          */
 944         priv_size = ((sizeof(struct ieee80211_local) +
 945                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
 946                     priv_data_len;
 947
 948         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 949
 950         if (!wiphy)
 951                 return NULL;
 952
 953         wiphy->privid = mac80211_wiphy_privid;
 954
 955         local = wiphy_priv(wiphy);
 956         local->hw.wiphy = wiphy;
 957
 958         local->hw.priv = (char *)local +
 959                          ((sizeof(struct ieee80211_local) +
 960                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
 961
 962         BUG_ON(!ops->tx);
 963         BUG_ON(!ops->start);
 964         BUG_ON(!ops->stop);
 965         BUG_ON(!ops->config);
 966         BUG_ON(!ops->add_interface);
 967         BUG_ON(!ops->remove_interface);
 968         BUG_ON(!ops->configure_filter);
 969         local->ops = ops;
 970
 971         /* for now, mdev needs sub_if_data :/ */
 972         mdev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
 973                             "wmaster%d", ether_setup);
 974         if (!mdev) {
 975                 wiphy_free(wiphy);
 976                 return NULL;
 977         }
 978
 979         sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
 980         mdev->ieee80211_ptr = &sdata->wdev;
 981         sdata->wdev.wiphy = wiphy;
 982
 983         local->hw.queues = 1; /* default */
 984
 985         local->mdev = mdev;
 986         local->rx_pre_handlers = ieee80211_rx_pre_handlers;
 987         local->rx_handlers = ieee80211_rx_handlers;
 988         local->tx_handlers = ieee80211_tx_handlers;
 989
 990         local->bridge_packets = 1;
 991
 992         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
 993         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
 994         local->short_retry_limit = 7;
 995         local->long_retry_limit = 4;
 996         local->hw.conf.radio_enabled = 1;
 997
 998         local->enabled_modes = ~0;
 999
1000         INIT_LIST_HEAD(&local->modes_list);
1001
1002         INIT_LIST_HEAD(&local->interfaces);
1003
1004         INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1005         ieee80211_rx_bss_list_init(mdev);
1006
1007         sta_info_init(local);
1008
1009         mdev->hard_start_xmit = ieee80211_master_start_xmit;
1010         mdev->open = ieee80211_master_open;
1011         mdev->stop = ieee80211_master_stop;
1012         mdev->type = ARPHRD_IEEE80211;
1013         mdev->header_ops = &ieee80211_header_ops;
1014         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
1015
1016         sdata->type = IEEE80211_IF_TYPE_AP;
1017         sdata->dev = mdev;
1018         sdata->local = local;
1019         sdata->u.ap.force_unicast_rateidx = -1;
1020         sdata->u.ap.max_ratectrl_rateidx = -1;
1021         ieee80211_if_sdata_init(sdata);
1022         /* no RCU needed since we're still during init phase */
1023         list_add_tail(&sdata->list, &local->interfaces);
1024
1025         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1026                      (unsigned long)local);
1027         tasklet_disable(&local->tx_pending_tasklet);
1028
1029         tasklet_init(&local->tasklet,
1030                      ieee80211_tasklet_handler,
1031                      (unsigned long) local);
1032         tasklet_disable(&local->tasklet);
1033
1034         skb_queue_head_init(&local->skb_queue);
1035         skb_queue_head_init(&local->skb_queue_unreliable);
1036
1037         return local_to_hw(local);
1038 }
1039 EXPORT_SYMBOL(ieee80211_alloc_hw);
1040
1041 int ieee80211_register_hw(struct ieee80211_hw *hw)
1042 {
1043         struct ieee80211_local *local = hw_to_local(hw);
1044         const char *name;
1045         int result;
1046
1047         result = wiphy_register(local->hw.wiphy);
1048         if (result < 0)
1049                 return result;
1050
1051         name = wiphy_dev(local->hw.wiphy)->driver->name;
1052         local->hw.workqueue = create_singlethread_workqueue(name);
1053         if (!local->hw.workqueue) {
1054                 result = -ENOMEM;
1055                 goto fail_workqueue;
1056         }
1057
1058         /*
1059          * The hardware needs headroom for sending the frame,
1060          * and we need some headroom for passing the frame to monitor
1061          * interfaces, but never both at the same time.
1062          */
1063         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1064                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
1065
1066         debugfs_hw_add(local);
1067
1068         local->hw.conf.beacon_int = 1000;
1069
1070         local->wstats_flags |= local->hw.max_rssi ?
1071                                IW_QUAL_LEVEL_UPDATED : IW_QUAL_LEVEL_INVALID;
1072         local->wstats_flags |= local->hw.max_signal ?
1073                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1074         local->wstats_flags |= local->hw.max_noise ?
1075                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1076         if (local->hw.max_rssi < 0 || local->hw.max_noise < 0)
1077                 local->wstats_flags |= IW_QUAL_DBM;
1078
1079         result = sta_info_start(local);
1080         if (result < 0)
1081                 goto fail_sta_info;
1082
1083         rtnl_lock();
1084         result = dev_alloc_name(local->mdev, local->mdev->name);
1085         if (result < 0)
1086                 goto fail_dev;
1087
1088         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1089         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1090
1091         result = register_netdevice(local->mdev);
1092         if (result < 0)
1093                 goto fail_dev;
1094
1095         ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1096         ieee80211_if_set_type(local->mdev, IEEE80211_IF_TYPE_AP);
1097
1098         result = ieee80211_init_rate_ctrl_alg(local,
1099                                               hw->rate_control_algorithm);
1100         if (result < 0) {
1101                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1102                        "algorithm\n", wiphy_name(local->hw.wiphy));
1103                 goto fail_rate;
1104         }
1105
1106         result = ieee80211_wep_init(local);
1107
1108         if (result < 0) {
1109                 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1110                        wiphy_name(local->hw.wiphy));
1111                 goto fail_wep;
1112         }
1113
1114         ieee80211_install_qdisc(local->mdev);
1115
1116         /* add one default STA interface */
1117         result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
1118                                   IEEE80211_IF_TYPE_STA);
1119         if (result)
1120                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1121                        wiphy_name(local->hw.wiphy));
1122
1123         local->reg_state = IEEE80211_DEV_REGISTERED;
1124         rtnl_unlock();
1125
1126         ieee80211_led_init(local);
1127
1128         return 0;
1129
1130 fail_wep:
1131         rate_control_deinitialize(local);
1132 fail_rate:
1133         ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1134         unregister_netdevice(local->mdev);
1135 fail_dev:
1136         rtnl_unlock();
1137         sta_info_stop(local);
1138 fail_sta_info:
1139         debugfs_hw_del(local);
1140         destroy_workqueue(local->hw.workqueue);
1141 fail_workqueue:
1142         wiphy_unregister(local->hw.wiphy);
1143         return result;
1144 }
1145 EXPORT_SYMBOL(ieee80211_register_hw);
1146
1147 int ieee80211_register_hwmode(struct ieee80211_hw *hw,
1148                               struct ieee80211_hw_mode *mode)
1149 {
1150         struct ieee80211_local *local = hw_to_local(hw);
1151         struct ieee80211_rate *rate;
1152         int i;
1153
1154         INIT_LIST_HEAD(&mode->list);
1155         list_add_tail(&mode->list, &local->modes_list);
1156
1157         local->hw_modes |= (1 << mode->mode);
1158         for (i = 0; i < mode->num_rates; i++) {
1159                 rate = &(mode->rates[i]);
1160                 rate->rate_inv = CHAN_UTIL_RATE_LCM / rate->rate;
1161         }
1162         ieee80211_prepare_rates(local, mode);
1163
1164         if (!local->oper_hw_mode) {
1165                 /* Default to this mode */
1166                 local->hw.conf.phymode = mode->mode;
1167                 local->oper_hw_mode = local->scan_hw_mode = mode;
1168                 local->oper_channel = local->scan_channel = &mode->channels[0];
1169                 local->hw.conf.mode = local->oper_hw_mode;
1170                 local->hw.conf.chan = local->oper_channel;
1171         }
1172
1173         if (!(hw->flags & IEEE80211_HW_DEFAULT_REG_DOMAIN_CONFIGURED))
1174                 ieee80211_set_default_regdomain(mode);
1175
1176         return 0;
1177 }
1178 EXPORT_SYMBOL(ieee80211_register_hwmode);
1179
1180 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1181 {
1182         struct ieee80211_local *local = hw_to_local(hw);
1183         struct ieee80211_sub_if_data *sdata, *tmp;
1184         int i;
1185
1186         tasklet_kill(&local->tx_pending_tasklet);
1187         tasklet_kill(&local->tasklet);
1188
1189         rtnl_lock();
1190
1191         BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
1192
1193         local->reg_state = IEEE80211_DEV_UNREGISTERED;
1194
1195         /*
1196          * At this point, interface list manipulations are fine
1197          * because the driver cannot be handing us frames any
1198          * more and the tasklet is killed.
1199          */
1200
1201         /*
1202          * First, we remove all non-master interfaces. Do this because they
1203          * may have bss pointer dependency on the master, and when we free
1204          * the master these would be freed as well, breaking our list
1205          * iteration completely.
1206          */
1207         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1208                 if (sdata->dev == local->mdev)
1209                         continue;
1210                 list_del(&sdata->list);
1211                 __ieee80211_if_del(local, sdata);
1212         }
1213
1214         /* then, finally, remove the master interface */
1215         __ieee80211_if_del(local, IEEE80211_DEV_TO_SUB_IF(local->mdev));
1216
1217         rtnl_unlock();
1218
1219         ieee80211_rx_bss_list_deinit(local->mdev);
1220         ieee80211_clear_tx_pending(local);
1221         sta_info_stop(local);
1222         rate_control_deinitialize(local);
1223         debugfs_hw_del(local);
1224
1225         for (i = 0; i < NUM_IEEE80211_MODES; i++) {
1226                 kfree(local->supp_rates[i]);
1227                 kfree(local->basic_rates[i]);
1228         }
1229
1230         if (skb_queue_len(&local->skb_queue)
1231                         || skb_queue_len(&local->skb_queue_unreliable))
1232                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1233                        wiphy_name(local->hw.wiphy));
1234         skb_queue_purge(&local->skb_queue);
1235         skb_queue_purge(&local->skb_queue_unreliable);
1236
1237         destroy_workqueue(local->hw.workqueue);
1238         wiphy_unregister(local->hw.wiphy);
1239         ieee80211_wep_free(local);
1240         ieee80211_led_exit(local);
1241 }
1242 EXPORT_SYMBOL(ieee80211_unregister_hw);
1243
1244 void ieee80211_free_hw(struct ieee80211_hw *hw)
1245 {
1246         struct ieee80211_local *local = hw_to_local(hw);
1247
1248         ieee80211_if_free(local->mdev);
1249         wiphy_free(local->hw.wiphy);
1250 }
1251 EXPORT_SYMBOL(ieee80211_free_hw);
1252
1253 static int __init ieee80211_init(void)
1254 {
1255         struct sk_buff *skb;
1256         int ret;
1257
1258         BUILD_BUG_ON(sizeof(struct ieee80211_tx_packet_data) > sizeof(skb->cb));
1259
1260 #ifdef CONFIG_MAC80211_RCSIMPLE
1261         ret = ieee80211_rate_control_register(&mac80211_rcsimple);
1262         if (ret)
1263                 return ret;
1264 #endif
1265
1266         ret = ieee80211_wme_register();
1267         if (ret) {
1268 #ifdef CONFIG_MAC80211_RCSIMPLE
1269                 ieee80211_rate_control_unregister(&mac80211_rcsimple);
1270 #endif
1271                 printk(KERN_DEBUG "ieee80211_init: failed to "
1272                        "initialize WME (err=%d)\n", ret);
1273                 return ret;
1274         }
1275
1276         ieee80211_debugfs_netdev_init();
1277         ieee80211_regdomain_init();
1278
1279         return 0;
1280 }
1281
1282 static void __exit ieee80211_exit(void)
1283 {
1284 #ifdef CONFIG_MAC80211_RCSIMPLE
1285         ieee80211_rate_control_unregister(&mac80211_rcsimple);
1286 #endif
1287
1288         ieee80211_wme_unregister();
1289         ieee80211_debugfs_netdev_exit();
1290 }
1291
1292
1293 subsys_initcall(ieee80211_init);
1294 module_exit(ieee80211_exit);
1295
1296 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1297 MODULE_LICENSE("GPL");