net/mac80211/ieee80211.c

   1 /*
   2  * Copyright 2002-2005, Instant802 Networks, Inc.
   3  * Copyright 2005-2006, Devicescape Software, Inc.
   4  * Copyright 2006-2007  Jiri Benc <jbenc@suse.cz>
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  */
  10
  11 #include <net/mac80211.h>
  12 #include <net/ieee80211_radiotap.h>
  13 #include <linux/module.h>
  14 #include <linux/init.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/types.h>
  17 #include <linux/slab.h>
  18 #include <linux/skbuff.h>
  19 #include <linux/etherdevice.h>
  20 #include <linux/if_arp.h>
  21 #include <linux/wireless.h>
  22 #include <linux/rtnetlink.h>
  23 #include <linux/bitmap.h>
  24 #include <net/net_namespace.h>
  25 #include <net/cfg80211.h>
  26
  27 #include "ieee80211_i.h"
  28 #include "ieee80211_rate.h"
  29 #include "wep.h"
  30 #include "wme.h"
  31 #include "aes_ccm.h"
  32 #include "ieee80211_led.h"
  33 #include "cfg.h"
  34 #include "debugfs.h"
  35 #include "debugfs_netdev.h"
  36
  37 /*
  38  * For seeing transmitted packets on monitor interfaces
  39  * we have a radiotap header too.
  40  */
  41 struct ieee80211_tx_status_rtap_hdr {
  42         struct ieee80211_radiotap_header hdr;
  43         __le16 tx_flags;
  44         u8 data_retries;
  45 } __attribute__ ((packed));
  46
  47 /* common interface routines */
  48
  49 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
  50 {
  51         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
  52         return ETH_ALEN;
  53 }
  54
  55 /* must be called under mdev tx lock */
  56 static void ieee80211_configure_filter(struct ieee80211_local *local)
  57 {
  58         unsigned int changed_flags;
  59         unsigned int new_flags = 0;
  60
  61         if (atomic_read(&local->iff_promiscs))
  62                 new_flags |= FIF_PROMISC_IN_BSS;
  63
  64         if (atomic_read(&local->iff_allmultis))
  65                 new_flags |= FIF_ALLMULTI;
  66
  67         if (local->monitors)
  68                 new_flags |= FIF_CONTROL |
  69                              FIF_OTHER_BSS |
  70                              FIF_BCN_PRBRESP_PROMISC;
  71
  72         changed_flags = local->filter_flags ^ new_flags;
  73
  74         /* be a bit nasty */
  75         new_flags |= (1<<31);
  76
  77         local->ops->configure_filter(local_to_hw(local),
  78                                      changed_flags, &new_flags,
  79                                      local->mdev->mc_count,
  80                                      local->mdev->mc_list);
  81
  82         WARN_ON(new_flags & (1<<31));
  83
  84         local->filter_flags = new_flags & ~(1<<31);
  85 }
  86
  87 /* master interface */
  88
  89 static int ieee80211_master_open(struct net_device *dev)
  90 {
  91         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
  92         struct ieee80211_sub_if_data *sdata;
  93         int res = -EOPNOTSUPP;
  94
  95         /* we hold the RTNL here so can safely walk the list */
  96         list_for_each_entry(sdata, &local->interfaces, list) {
  97                 if (sdata->dev != dev && netif_running(sdata->dev)) {
  98                         res = 0;
  99                         break;
 100                 }
 101         }
 102         return res;
 103 }
 104
 105 static int ieee80211_master_stop(struct net_device *dev)
 106 {
 107         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 108         struct ieee80211_sub_if_data *sdata;
 109
 110         /* we hold the RTNL here so can safely walk the list */
 111         list_for_each_entry(sdata, &local->interfaces, list)
 112                 if (sdata->dev != dev && netif_running(sdata->dev))
 113                         dev_close(sdata->dev);
 114
 115         return 0;
 116 }
 117
 118 static void ieee80211_master_set_multicast_list(struct net_device *dev)
 119 {
 120         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 121
 122         ieee80211_configure_filter(local);
 123 }
 124
 125 /* regular interfaces */
 126
 127 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 128 {
 129         /* FIX: what would be proper limits for MTU?
 130          * This interface uses 802.3 frames. */
 131         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6) {
 132                 printk(KERN_WARNING "%s: invalid MTU %d\n",
 133                        dev->name, new_mtu);
 134                 return -EINVAL;
 135         }
 136
 137 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 138         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
 139 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 140         dev->mtu = new_mtu;
 141         return 0;
 142 }
 143
 144 static inline int identical_mac_addr_allowed(int type1, int type2)
 145 {
 146         return (type1 == IEEE80211_IF_TYPE_MNTR ||
 147                 type2 == IEEE80211_IF_TYPE_MNTR ||
 148                 (type1 == IEEE80211_IF_TYPE_AP &&
 149                  type2 == IEEE80211_IF_TYPE_WDS) ||
 150                 (type1 == IEEE80211_IF_TYPE_WDS &&
 151                  (type2 == IEEE80211_IF_TYPE_WDS ||
 152                   type2 == IEEE80211_IF_TYPE_AP)) ||
 153                 (type1 == IEEE80211_IF_TYPE_AP &&
 154                  type2 == IEEE80211_IF_TYPE_VLAN) ||
 155                 (type1 == IEEE80211_IF_TYPE_VLAN &&
 156                  (type2 == IEEE80211_IF_TYPE_AP ||
 157                   type2 == IEEE80211_IF_TYPE_VLAN)));
 158 }
 159
 160 static int ieee80211_open(struct net_device *dev)
 161 {
 162         struct ieee80211_sub_if_data *sdata, *nsdata;
 163         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 164         struct ieee80211_if_init_conf conf;
 165         int res;
 166
 167         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 168
 169         /* we hold the RTNL here so can safely walk the list */
 170         list_for_each_entry(nsdata, &local->interfaces, list) {
 171                 struct net_device *ndev = nsdata->dev;
 172
 173                 if (ndev != dev && ndev != local->mdev && netif_running(ndev) &&
 174                     compare_ether_addr(dev->dev_addr, ndev->dev_addr) == 0) {
 175                         /*
 176                          * check whether it may have the same address
 177                          */
 178                         if (!identical_mac_addr_allowed(sdata->type,
 179                                                         nsdata->type))
 180                                 return -ENOTUNIQ;
 181
 182                         /*
 183                          * can only add VLANs to enabled APs
 184                          */
 185                         if (sdata->type == IEEE80211_IF_TYPE_VLAN &&
 186                             nsdata->type == IEEE80211_IF_TYPE_AP &&
 187                             netif_running(nsdata->dev))
 188                                 sdata->u.vlan.ap = nsdata;
 189                 }
 190         }
 191
 192         switch (sdata->type) {
 193         case IEEE80211_IF_TYPE_WDS:
 194                 if (is_zero_ether_addr(sdata->u.wds.remote_addr))
 195                         return -ENOLINK;
 196                 break;
 197         case IEEE80211_IF_TYPE_VLAN:
 198                 if (!sdata->u.vlan.ap)
 199                         return -ENOLINK;
 200                 break;
 201         case IEEE80211_IF_TYPE_AP:
 202         case IEEE80211_IF_TYPE_STA:
 203         case IEEE80211_IF_TYPE_MNTR:
 204         case IEEE80211_IF_TYPE_IBSS:
 205                 /* no special treatment */
 206                 break;
 207         case IEEE80211_IF_TYPE_INVALID:
 208                 /* cannot happen */
 209                 WARN_ON(1);
 210                 break;
 211         }
 212
 213         if (local->open_count == 0) {
 214                 res = 0;
 215                 if (local->ops->start)
 216                         res = local->ops->start(local_to_hw(local));
 217                 if (res)
 218                         return res;
 219                 ieee80211_hw_config(local);
 220         }
 221
 222         switch (sdata->type) {
 223         case IEEE80211_IF_TYPE_VLAN:
 224                 list_add(&sdata->u.vlan.list, &sdata->u.vlan.ap->u.ap.vlans);
 225                 /* no need to tell driver */
 226                 break;
 227         case IEEE80211_IF_TYPE_MNTR:
 228                 /* must be before the call to ieee80211_configure_filter */
 229                 local->monitors++;
 230                 if (local->monitors == 1) {
 231                         netif_tx_lock_bh(local->mdev);
 232                         ieee80211_configure_filter(local);
 233                         netif_tx_unlock_bh(local->mdev);
 234
 235                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 236                 }
 237                 break;
 238         case IEEE80211_IF_TYPE_STA:
 239         case IEEE80211_IF_TYPE_IBSS:
 240                 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
 241                 /* fall through */
 242         default:
 243                 conf.if_id = dev->ifindex;
 244                 conf.type = sdata->type;
 245                 conf.mac_addr = dev->dev_addr;
 246                 res = local->ops->add_interface(local_to_hw(local), &conf);
 247                 if (res && !local->open_count && local->ops->stop)
 248                         local->ops->stop(local_to_hw(local));
 249                 if (res)
 250                         return res;
 251
 252                 ieee80211_if_config(dev);
 253                 ieee80211_reset_erp_info(dev);
 254                 ieee80211_enable_keys(sdata);
 255
 256                 if (sdata->type == IEEE80211_IF_TYPE_STA &&
 257                     !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
 258                         netif_carrier_off(dev);
 259                 else
 260                         netif_carrier_on(dev);
 261         }
 262
 263         if (local->open_count == 0) {
 264                 res = dev_open(local->mdev);
 265                 WARN_ON(res);
 266                 tasklet_enable(&local->tx_pending_tasklet);
 267                 tasklet_enable(&local->tasklet);
 268         }
 269
 270         /*
 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                 }
 339                 break;
 340         case IEEE80211_IF_TYPE_STA:
 341         case IEEE80211_IF_TYPE_IBSS:
 342                 sdata->u.sta.state = IEEE80211_DISABLED;
 343                 del_timer_sync(&sdata->u.sta.timer);
 344                 /*
 345                  * When we get here, the interface is marked down.
 346                  * Call synchronize_rcu() to wait for the RX path
 347                  * should it be using the interface and enqueuing
 348                  * frames at this very time on another CPU.
 349                  */
 350                 synchronize_rcu();
 351                 skb_queue_purge(&sdata->u.sta.skb_queue);
 352
 353                 if (!local->ops->hw_scan &&
 354                     local->scan_dev == sdata->dev) {
 355                         local->sta_scanning = 0;
 356                         cancel_delayed_work(&local->scan_work);
 357                 }
 358                 flush_workqueue(local->hw.workqueue);
 359
 360                 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
 361                 kfree(sdata->u.sta.extra_ie);
 362                 sdata->u.sta.extra_ie = NULL;
 363                 sdata->u.sta.extra_ie_len = 0;
 364                 /* fall through */
 365         default:
 366                 conf.if_id = dev->ifindex;
 367                 conf.type = sdata->type;
 368                 conf.mac_addr = dev->dev_addr;
 369                 /* disable all keys for as long as this netdev is down */
 370                 ieee80211_disable_keys(sdata);
 371                 local->ops->remove_interface(local_to_hw(local), &conf);
 372         }
 373
 374         if (local->open_count == 0) {
 375                 if (netif_running(local->mdev))
 376                         dev_close(local->mdev);
 377
 378                 if (local->ops->stop)
 379                         local->ops->stop(local_to_hw(local));
 380
 381                 tasklet_disable(&local->tx_pending_tasklet);
 382                 tasklet_disable(&local->tasklet);
 383         }
 384
 385         return 0;
 386 }
 387
 388 static void ieee80211_set_multicast_list(struct net_device *dev)
 389 {
 390         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 391         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 392         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 393
 394         allmulti = !!(dev->flags & IFF_ALLMULTI);
 395         promisc = !!(dev->flags & IFF_PROMISC);
 396         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 397         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 398
 399         if (allmulti != sdata_allmulti) {
 400                 if (dev->flags & IFF_ALLMULTI)
 401                         atomic_inc(&local->iff_allmultis);
 402                 else
 403                         atomic_dec(&local->iff_allmultis);
 404                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 405         }
 406
 407         if (promisc != sdata_promisc) {
 408                 if (dev->flags & IFF_PROMISC)
 409                         atomic_inc(&local->iff_promiscs);
 410                 else
 411                         atomic_dec(&local->iff_promiscs);
 412                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 413         }
 414
 415         dev_mc_sync(local->mdev, dev);
 416 }
 417
 418 static const struct header_ops ieee80211_header_ops = {
 419         .create         = eth_header,
 420         .parse          = header_parse_80211,
 421         .rebuild        = eth_rebuild_header,
 422         .cache          = eth_header_cache,
 423         .cache_update   = eth_header_cache_update,
 424 };
 425
 426 /* Must not be called for mdev */
 427 void ieee80211_if_setup(struct net_device *dev)
 428 {
 429         ether_setup(dev);
 430         dev->header_ops = &ieee80211_header_ops;
 431         dev->hard_start_xmit = ieee80211_subif_start_xmit;
 432         dev->wireless_handlers = &ieee80211_iw_handler_def;
 433         dev->set_multicast_list = ieee80211_set_multicast_list;
 434         dev->change_mtu = ieee80211_change_mtu;
 435         dev->open = ieee80211_open;
 436         dev->stop = ieee80211_stop;
 437         dev->destructor = ieee80211_if_free;
 438 }
 439
 440 /* WDS specialties */
 441
 442 int ieee80211_if_update_wds(struct net_device *dev, u8 *remote_addr)
 443 {
 444         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 445         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 446         struct sta_info *sta;
 447         DECLARE_MAC_BUF(mac);
 448
 449         if (compare_ether_addr(remote_addr, sdata->u.wds.remote_addr) == 0)
 450                 return 0;
 451
 452         /* Create STA entry for the new peer */
 453         sta = sta_info_add(local, dev, remote_addr, GFP_KERNEL);
 454         if (!sta)
 455                 return -ENOMEM;
 456         sta_info_put(sta);
 457
 458         /* Remove STA entry for the old peer */
 459         sta = sta_info_get(local, sdata->u.wds.remote_addr);
 460         if (sta) {
 461                 sta_info_free(sta);
 462                 sta_info_put(sta);
 463         } else {
 464                 printk(KERN_DEBUG "%s: could not find STA entry for WDS link "
 465                        "peer %s\n",
 466                        dev->name, print_mac(mac, sdata->u.wds.remote_addr));
 467         }
 468
 469         /* Update WDS link data */
 470         memcpy(&sdata->u.wds.remote_addr, remote_addr, ETH_ALEN);
 471
 472         return 0;
 473 }
 474
 475 /* everything else */
 476
 477 static int __ieee80211_if_config(struct net_device *dev,
 478                                  struct sk_buff *beacon,
 479                                  struct ieee80211_tx_control *control)
 480 {
 481         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 482         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 483         struct ieee80211_if_conf conf;
 484
 485         if (!local->ops->config_interface || !netif_running(dev))
 486                 return 0;
 487
 488         memset(&conf, 0, sizeof(conf));
 489         conf.type = sdata->type;
 490         if (sdata->type == IEEE80211_IF_TYPE_STA ||
 491             sdata->type == IEEE80211_IF_TYPE_IBSS) {
 492                 conf.bssid = sdata->u.sta.bssid;
 493                 conf.ssid = sdata->u.sta.ssid;
 494                 conf.ssid_len = sdata->u.sta.ssid_len;
 495         } else if (sdata->type == IEEE80211_IF_TYPE_AP) {
 496                 conf.ssid = sdata->u.ap.ssid;
 497                 conf.ssid_len = sdata->u.ap.ssid_len;
 498                 conf.beacon = beacon;
 499                 conf.beacon_control = control;
 500         }
 501         return local->ops->config_interface(local_to_hw(local),
 502                                            dev->ifindex, &conf);
 503 }
 504
 505 int ieee80211_if_config(struct net_device *dev)
 506 {
 507         return __ieee80211_if_config(dev, NULL, NULL);
 508 }
 509
 510 int ieee80211_if_config_beacon(struct net_device *dev)
 511 {
 512         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 513         struct ieee80211_tx_control control;
 514         struct sk_buff *skb;
 515
 516         if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
 517                 return 0;
 518         skb = ieee80211_beacon_get(local_to_hw(local), dev->ifindex, &control);
 519         if (!skb)
 520                 return -ENOMEM;
 521         return __ieee80211_if_config(dev, skb, &control);
 522 }
 523
 524 int ieee80211_hw_config(struct ieee80211_local *local)
 525 {
 526         struct ieee80211_hw_mode *mode;
 527         struct ieee80211_channel *chan;
 528         int ret = 0;
 529
 530         if (local->sta_scanning) {
 531                 chan = local->scan_channel;
 532                 mode = local->scan_hw_mode;
 533         } else {
 534                 chan = local->oper_channel;
 535                 mode = local->oper_hw_mode;
 536         }
 537
 538         local->hw.conf.channel = chan->chan;
 539         local->hw.conf.channel_val = chan->val;
 540         if (!local->hw.conf.power_level) {
 541                 local->hw.conf.power_level = chan->power_level;
 542         } else {
 543                 local->hw.conf.power_level = min(chan->power_level,
 544                                                  local->hw.conf.power_level);
 545         }
 546         local->hw.conf.freq = chan->freq;
 547         local->hw.conf.phymode = mode->mode;
 548         local->hw.conf.antenna_max = chan->antenna_max;
 549         local->hw.conf.chan = chan;
 550         local->hw.conf.mode = mode;
 551
 552 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 553         printk(KERN_DEBUG "HW CONFIG: channel=%d freq=%d "
 554                "phymode=%d\n", local->hw.conf.channel, local->hw.conf.freq,
 555                local->hw.conf.phymode);
 556 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 557
 558         if (local->open_count)
 559                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
 560
 561         return ret;
 562 }
 563
 564 void ieee80211_erp_info_change_notify(struct net_device *dev, u8 changes)
 565 {
 566         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 567         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 568         if (local->ops->erp_ie_changed)
 569                 local->ops->erp_ie_changed(local_to_hw(local), changes,
 570                         !!(sdata->flags & IEEE80211_SDATA_USE_PROTECTION),
 571                         !(sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE));
 572 }
 573
 574 void ieee80211_reset_erp_info(struct net_device *dev)
 575 {
 576         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 577
 578         sdata->flags &= ~(IEEE80211_SDATA_USE_PROTECTION |
 579                         IEEE80211_SDATA_SHORT_PREAMBLE);
 580         ieee80211_erp_info_change_notify(dev,
 581                                          IEEE80211_ERP_CHANGE_PROTECTION |
 582                                          IEEE80211_ERP_CHANGE_PREAMBLE);
 583 }
 584
 585 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 586                                  struct sk_buff *skb,
 587                                  struct ieee80211_tx_status *status)
 588 {
 589         struct ieee80211_local *local = hw_to_local(hw);
 590         struct ieee80211_tx_status *saved;
 591         int tmp;
 592
 593         skb->dev = local->mdev;
 594         saved = kmalloc(sizeof(struct ieee80211_tx_status), GFP_ATOMIC);
 595         if (unlikely(!saved)) {
 596                 if (net_ratelimit())
 597                         printk(KERN_WARNING "%s: Not enough memory, "
 598                                "dropping tx status", skb->dev->name);
 599                 /* should be dev_kfree_skb_irq, but due to this function being
 600                  * named _irqsafe instead of just _irq we can't be sure that
 601                  * people won't call it from non-irq contexts */
 602                 dev_kfree_skb_any(skb);
 603                 return;
 604         }
 605         memcpy(saved, status, sizeof(struct ieee80211_tx_status));
 606         /* copy pointer to saved status into skb->cb for use by tasklet */
 607         memcpy(skb->cb, &saved, sizeof(saved));
 608
 609         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 610         skb_queue_tail(status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS ?
 611                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 612         tmp = skb_queue_len(&local->skb_queue) +
 613                 skb_queue_len(&local->skb_queue_unreliable);
 614         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 615                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 616                 memcpy(&saved, skb->cb, sizeof(saved));
 617                 kfree(saved);
 618                 dev_kfree_skb_irq(skb);
 619                 tmp--;
 620                 I802_DEBUG_INC(local->tx_status_drop);
 621         }
 622         tasklet_schedule(&local->tasklet);
 623 }
 624 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 625
 626 static void ieee80211_tasklet_handler(unsigned long data)
 627 {
 628         struct ieee80211_local *local = (struct ieee80211_local *) data;
 629         struct sk_buff *skb;
 630         struct ieee80211_rx_status rx_status;
 631         struct ieee80211_tx_status *tx_status;
 632
 633         while ((skb = skb_dequeue(&local->skb_queue)) ||
 634                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 635                 switch (skb->pkt_type) {
 636                 case IEEE80211_RX_MSG:
 637                         /* status is in skb->cb */
 638                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 639                         /* Clear skb->type in order to not confuse kernel
 640                          * netstack. */
 641                         skb->pkt_type = 0;
 642                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 643                         break;
 644                 case IEEE80211_TX_STATUS_MSG:
 645                         /* get pointer to saved status out of skb->cb */
 646                         memcpy(&tx_status, skb->cb, sizeof(tx_status));
 647                         skb->pkt_type = 0;
 648                         ieee80211_tx_status(local_to_hw(local),
 649                                             skb, tx_status);
 650                         kfree(tx_status);
 651                         break;
 652                 default: /* should never get here! */
 653                         printk(KERN_ERR "%s: Unknown message type (%d)\n",
 654                                wiphy_name(local->hw.wiphy), skb->pkt_type);
 655                         dev_kfree_skb(skb);
 656                         break;
 657                 }
 658         }
 659 }
 660
 661 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 662  * make a prepared TX frame (one that has been given to hw) to look like brand
 663  * new IEEE 802.11 frame that is ready to go through TX processing again.
 664  * Also, tx_packet_data in cb is restored from tx_control. */
 665 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 666                                       struct ieee80211_key *key,
 667                                       struct sk_buff *skb,
 668                                       struct ieee80211_tx_control *control)
 669 {
 670         int hdrlen, iv_len, mic_len;
 671         struct ieee80211_tx_packet_data *pkt_data;
 672
 673         pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
 674         pkt_data->ifindex = control->ifindex;
 675         pkt_data->flags = 0;
 676         if (control->flags & IEEE80211_TXCTL_REQ_TX_STATUS)
 677                 pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
 678         if (control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT)
 679                 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
 680         if (control->flags & IEEE80211_TXCTL_REQUEUE)
 681                 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
 682         pkt_data->queue = control->queue;
 683
 684         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 685
 686         if (!key)
 687                 goto no_key;
 688
 689         switch (key->conf.alg) {
 690         case ALG_WEP:
 691                 iv_len = WEP_IV_LEN;
 692                 mic_len = WEP_ICV_LEN;
 693                 break;
 694         case ALG_TKIP:
 695                 iv_len = TKIP_IV_LEN;
 696                 mic_len = TKIP_ICV_LEN;
 697                 break;
 698         case ALG_CCMP:
 699                 iv_len = CCMP_HDR_LEN;
 700                 mic_len = CCMP_MIC_LEN;
 701                 break;
 702         default:
 703                 goto no_key;
 704         }
 705
 706         if (skb->len >= mic_len &&
 707             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 708                 skb_trim(skb, skb->len - mic_len);
 709         if (skb->len >= iv_len && skb->len > hdrlen) {
 710                 memmove(skb->data + iv_len, skb->data, hdrlen);
 711                 skb_pull(skb, iv_len);
 712         }
 713
 714 no_key:
 715         {
 716                 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 717                 u16 fc = le16_to_cpu(hdr->frame_control);
 718                 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
 719                         fc &= ~IEEE80211_STYPE_QOS_DATA;
 720                         hdr->frame_control = cpu_to_le16(fc);
 721                         memmove(skb->data + 2, skb->data, hdrlen - 2);
 722                         skb_pull(skb, 2);
 723                 }
 724         }
 725 }
 726
 727 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
 728                          struct ieee80211_tx_status *status)
 729 {
 730         struct sk_buff *skb2;
 731         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 732         struct ieee80211_local *local = hw_to_local(hw);
 733         u16 frag, type;
 734         struct ieee80211_tx_status_rtap_hdr *rthdr;
 735         struct ieee80211_sub_if_data *sdata;
 736         int monitors;
 737
 738         if (!status) {
 739                 printk(KERN_ERR
 740                        "%s: ieee80211_tx_status called with NULL status\n",
 741                        wiphy_name(local->hw.wiphy));
 742                 dev_kfree_skb(skb);
 743                 return;
 744         }
 745
 746         if (status->excessive_retries) {
 747                 struct sta_info *sta;
 748                 sta = sta_info_get(local, hdr->addr1);
 749                 if (sta) {
 750                         if (sta->flags & WLAN_STA_PS) {
 751                                 /* The STA is in power save mode, so assume
 752                                  * that this TX packet failed because of that.
 753                                  */
 754                                 status->excessive_retries = 0;
 755                                 status->flags |= IEEE80211_TX_STATUS_TX_FILTERED;
 756                         }
 757                         sta_info_put(sta);
 758                 }
 759         }
 760
 761         if (status->flags & IEEE80211_TX_STATUS_TX_FILTERED) {
 762                 struct sta_info *sta;
 763                 sta = sta_info_get(local, hdr->addr1);
 764                 if (sta) {
 765                         sta->tx_filtered_count++;
 766
 767                         /* Clear the TX filter mask for this STA when sending
 768                          * the next packet. If the STA went to power save mode,
 769                          * this will happen when it is waking up for the next
 770                          * time. */
 771                         sta->clear_dst_mask = 1;
 772
 773                         /* TODO: Is the WLAN_STA_PS flag always set here or is
 774                          * the race between RX and TX status causing some
 775                          * packets to be filtered out before 80211.o gets an
 776                          * update for PS status? This seems to be the case, so
 777                          * no changes are likely to be needed. */
 778                         if (sta->flags & WLAN_STA_PS &&
 779                             skb_queue_len(&sta->tx_filtered) <
 780                             STA_MAX_TX_BUFFER) {
 781                                 ieee80211_remove_tx_extra(local, sta->key,
 782                                                           skb,
 783                                                           &status->control);
 784                                 skb_queue_tail(&sta->tx_filtered, skb);
 785                         } else if (!(sta->flags & WLAN_STA_PS) &&
 786                                    !(status->control.flags & IEEE80211_TXCTL_REQUEUE)) {
 787                                 /* Software retry the packet once */
 788                                 status->control.flags |= IEEE80211_TXCTL_REQUEUE;
 789                                 ieee80211_remove_tx_extra(local, sta->key,
 790                                                           skb,
 791                                                           &status->control);
 792                                 dev_queue_xmit(skb);
 793                         } else {
 794                                 if (net_ratelimit()) {
 795                                         printk(KERN_DEBUG "%s: dropped TX "
 796                                                "filtered frame queue_len=%d "
 797                                                "PS=%d @%lu\n",
 798                                                wiphy_name(local->hw.wiphy),
 799                                                skb_queue_len(
 800                                                        &sta->tx_filtered),
 801                                                !!(sta->flags & WLAN_STA_PS),
 802                                                jiffies);
 803                                 }
 804                                 dev_kfree_skb(skb);
 805                         }
 806                         sta_info_put(sta);
 807                         return;
 808                 }
 809         } else {
 810                 /* FIXME: STUPID to call this with both local and local->mdev */
 811                 rate_control_tx_status(local, local->mdev, skb, status);
 812         }
 813
 814         ieee80211_led_tx(local, 0);
 815
 816         /* SNMP counters
 817          * Fragments are passed to low-level drivers as separate skbs, so these
 818          * are actually fragments, not frames. Update frame counters only for
 819          * the first fragment of the frame. */
 820
 821         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 822         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 823
 824         if (status->flags & IEEE80211_TX_STATUS_ACK) {
 825                 if (frag == 0) {
 826                         local->dot11TransmittedFrameCount++;
 827                         if (is_multicast_ether_addr(hdr->addr1))
 828                                 local->dot11MulticastTransmittedFrameCount++;
 829                         if (status->retry_count > 0)
 830                                 local->dot11RetryCount++;
 831                         if (status->retry_count > 1)
 832                                 local->dot11MultipleRetryCount++;
 833                 }
 834
 835                 /* This counter shall be incremented for an acknowledged MPDU
 836                  * with an individual address in the address 1 field or an MPDU
 837                  * with a multicast address in the address 1 field of type Data
 838                  * or Management. */
 839                 if (!is_multicast_ether_addr(hdr->addr1) ||
 840                     type == IEEE80211_FTYPE_DATA ||
 841                     type == IEEE80211_FTYPE_MGMT)
 842                         local->dot11TransmittedFragmentCount++;
 843         } else {
 844                 if (frag == 0)
 845                         local->dot11FailedCount++;
 846         }
 847
 848         /* this was a transmitted frame, but now we want to reuse it */
 849         skb_orphan(skb);
 850
 851         if (!local->monitors) {
 852                 dev_kfree_skb(skb);
 853                 return;
 854         }
 855
 856         /* send frame to monitor interfaces now */
 857
 858         if (skb_headroom(skb) < sizeof(*rthdr)) {
 859                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 860                 dev_kfree_skb(skb);
 861                 return;
 862         }
 863
 864         rthdr = (struct ieee80211_tx_status_rtap_hdr*)
 865                                 skb_push(skb, sizeof(*rthdr));
 866
 867         memset(rthdr, 0, sizeof(*rthdr));
 868         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 869         rthdr->hdr.it_present =
 870                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 871                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
 872
 873         if (!(status->flags & IEEE80211_TX_STATUS_ACK) &&
 874             !is_multicast_ether_addr(hdr->addr1))
 875                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 876
 877         if ((status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) &&
 878             (status->control.flags & IEEE80211_TXCTL_USE_CTS_PROTECT))
 879                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 880         else if (status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS)
 881                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 882
 883         rthdr->data_retries = status->retry_count;
 884
 885         rcu_read_lock();
 886         monitors = local->monitors;
 887         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 888                 /*
 889                  * Using the monitors counter is possibly racy, but
 890                  * if the value is wrong we simply either clone the skb
 891                  * once too much or forget sending it to one monitor iface
 892                  * The latter case isn't nice but fixing the race is much
 893                  * more complicated.
 894                  */
 895                 if (!monitors || !skb)
 896                         goto out;
 897
 898                 if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
 899                         if (!netif_running(sdata->dev))
 900                                 continue;
 901                         monitors--;
 902                         if (monitors)
 903                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 904                         else
 905                                 skb2 = NULL;
 906                         skb->dev = sdata->dev;
 907                         /* XXX: is this sufficient for BPF? */
 908                         skb_set_mac_header(skb, 0);
 909                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 910                         skb->pkt_type = PACKET_OTHERHOST;
 911                         skb->protocol = htons(ETH_P_802_2);
 912                         memset(skb->cb, 0, sizeof(skb->cb));
 913                         netif_rx(skb);
 914                         skb = skb2;
 915                 }
 916         }
 917  out:
 918         rcu_read_unlock();
 919         if (skb)
 920                 dev_kfree_skb(skb);
 921 }
 922 EXPORT_SYMBOL(ieee80211_tx_status);
 923
 924 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 925                                         const struct ieee80211_ops *ops)
 926 {
 927         struct net_device *mdev;
 928         struct ieee80211_local *local;
 929         struct ieee80211_sub_if_data *sdata;
 930         int priv_size;
 931         struct wiphy *wiphy;
 932
 933         /* Ensure 32-byte alignment of our private data and hw private data.
 934          * We use the wiphy priv data for both our ieee80211_local and for
 935          * the driver's private data
 936          *
 937          * In memory it'll be like this:
 938          *
 939          * +-------------------------+
 940          * | struct wiphy           |
 941          * +-------------------------+
 942          * | struct ieee80211_local  |
 943          * +-------------------------+
 944          * | driver's private data   |
 945          * +-------------------------+
 946          *
 947          */
 948         priv_size = ((sizeof(struct ieee80211_local) +
 949                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
 950                     priv_data_len;
 951
 952         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 953
 954         if (!wiphy)
 955                 return NULL;
 956
 957         wiphy->privid = mac80211_wiphy_privid;
 958
 959         local = wiphy_priv(wiphy);
 960         local->hw.wiphy = wiphy;
 961
 962         local->hw.priv = (char *)local +
 963                          ((sizeof(struct ieee80211_local) +
 964                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
 965
 966         BUG_ON(!ops->tx);
 967         BUG_ON(!ops->start);
 968         BUG_ON(!ops->stop);
 969         BUG_ON(!ops->config);
 970         BUG_ON(!ops->add_interface);
 971         BUG_ON(!ops->remove_interface);
 972         BUG_ON(!ops->configure_filter);
 973         local->ops = ops;
 974
 975         /* for now, mdev needs sub_if_data :/ */
 976         mdev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
 977                             "wmaster%d", ether_setup);
 978         if (!mdev) {
 979                 wiphy_free(wiphy);
 980                 return NULL;
 981         }
 982
 983         sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
 984         mdev->ieee80211_ptr = &sdata->wdev;
 985         sdata->wdev.wiphy = wiphy;
 986
 987         local->hw.queues = 1; /* default */
 988
 989         local->mdev = mdev;
 990         local->rx_pre_handlers = ieee80211_rx_pre_handlers;
 991         local->rx_handlers = ieee80211_rx_handlers;
 992         local->tx_handlers = ieee80211_tx_handlers;
 993
 994         local->bridge_packets = 1;
 995
 996         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
 997         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
 998         local->short_retry_limit = 7;
 999         local->long_retry_limit = 4;
1000         local->hw.conf.radio_enabled = 1;
1001
1002         local->enabled_modes = ~0;
1003
1004         INIT_LIST_HEAD(&local->modes_list);
1005
1006         INIT_LIST_HEAD(&local->interfaces);
1007
1008         INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1009         ieee80211_rx_bss_list_init(mdev);
1010
1011         sta_info_init(local);
1012
1013         mdev->hard_start_xmit = ieee80211_master_start_xmit;
1014         mdev->open = ieee80211_master_open;
1015         mdev->stop = ieee80211_master_stop;
1016         mdev->type = ARPHRD_IEEE80211;
1017         mdev->header_ops = &ieee80211_header_ops;
1018         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
1019
1020         sdata->type = IEEE80211_IF_TYPE_AP;
1021         sdata->dev = mdev;
1022         sdata->local = local;
1023         sdata->u.ap.force_unicast_rateidx = -1;
1024         sdata->u.ap.max_ratectrl_rateidx = -1;
1025         ieee80211_if_sdata_init(sdata);
1026         /* no RCU needed since we're still during init phase */
1027         list_add_tail(&sdata->list, &local->interfaces);
1028
1029         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1030                      (unsigned long)local);
1031         tasklet_disable(&local->tx_pending_tasklet);
1032
1033         tasklet_init(&local->tasklet,
1034                      ieee80211_tasklet_handler,
1035                      (unsigned long) local);
1036         tasklet_disable(&local->tasklet);
1037
1038         skb_queue_head_init(&local->skb_queue);
1039         skb_queue_head_init(&local->skb_queue_unreliable);
1040
1041         return local_to_hw(local);
1042 }
1043 EXPORT_SYMBOL(ieee80211_alloc_hw);
1044
1045 int ieee80211_register_hw(struct ieee80211_hw *hw)
1046 {
1047         struct ieee80211_local *local = hw_to_local(hw);
1048         const char *name;
1049         int result;
1050
1051         result = wiphy_register(local->hw.wiphy);
1052         if (result < 0)
1053                 return result;
1054
1055         name = wiphy_dev(local->hw.wiphy)->driver->name;
1056         local->hw.workqueue = create_singlethread_workqueue(name);
1057         if (!local->hw.workqueue) {
1058                 result = -ENOMEM;
1059                 goto fail_workqueue;
1060         }
1061
1062         /*
1063          * The hardware needs headroom for sending the frame,
1064          * and we need some headroom for passing the frame to monitor
1065          * interfaces, but never both at the same time.
1066          */
1067         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1068                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
1069
1070         debugfs_hw_add(local);
1071
1072         local->hw.conf.beacon_int = 1000;
1073
1074         local->wstats_flags |= local->hw.max_rssi ?
1075                                IW_QUAL_LEVEL_UPDATED : IW_QUAL_LEVEL_INVALID;
1076         local->wstats_flags |= local->hw.max_signal ?
1077                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1078         local->wstats_flags |= local->hw.max_noise ?
1079                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1080         if (local->hw.max_rssi < 0 || local->hw.max_noise < 0)
1081                 local->wstats_flags |= IW_QUAL_DBM;
1082
1083         result = sta_info_start(local);
1084         if (result < 0)
1085                 goto fail_sta_info;
1086
1087         rtnl_lock();
1088         result = dev_alloc_name(local->mdev, local->mdev->name);
1089         if (result < 0)
1090                 goto fail_dev;
1091
1092         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1093         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1094
1095         result = register_netdevice(local->mdev);
1096         if (result < 0)
1097                 goto fail_dev;
1098
1099         ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1100         ieee80211_if_set_type(local->mdev, IEEE80211_IF_TYPE_AP);
1101
1102         result = ieee80211_init_rate_ctrl_alg(local,
1103                                               hw->rate_control_algorithm);
1104         if (result < 0) {
1105                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1106                        "algorithm\n", wiphy_name(local->hw.wiphy));
1107                 goto fail_rate;
1108         }
1109
1110         result = ieee80211_wep_init(local);
1111
1112         if (result < 0) {
1113                 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1114                        wiphy_name(local->hw.wiphy));
1115                 goto fail_wep;
1116         }
1117
1118         ieee80211_install_qdisc(local->mdev);
1119
1120         /* add one default STA interface */
1121         result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
1122                                   IEEE80211_IF_TYPE_STA);
1123         if (result)
1124                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1125                        wiphy_name(local->hw.wiphy));
1126
1127         local->reg_state = IEEE80211_DEV_REGISTERED;
1128         rtnl_unlock();
1129
1130         ieee80211_led_init(local);
1131
1132         return 0;
1133
1134 fail_wep:
1135         rate_control_deinitialize(local);
1136 fail_rate:
1137         ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1138         unregister_netdevice(local->mdev);
1139 fail_dev:
1140         rtnl_unlock();
1141         sta_info_stop(local);
1142 fail_sta_info:
1143         debugfs_hw_del(local);
1144         destroy_workqueue(local->hw.workqueue);
1145 fail_workqueue:
1146         wiphy_unregister(local->hw.wiphy);
1147         return result;
1148 }
1149 EXPORT_SYMBOL(ieee80211_register_hw);
1150
1151 int ieee80211_register_hwmode(struct ieee80211_hw *hw,
1152                               struct ieee80211_hw_mode *mode)
1153 {
1154         struct ieee80211_local *local = hw_to_local(hw);
1155         struct ieee80211_rate *rate;
1156         int i;
1157
1158         INIT_LIST_HEAD(&mode->list);
1159         list_add_tail(&mode->list, &local->modes_list);
1160
1161         local->hw_modes |= (1 << mode->mode);
1162         for (i = 0; i < mode->num_rates; i++) {
1163                 rate = &(mode->rates[i]);
1164                 rate->rate_inv = CHAN_UTIL_RATE_LCM / rate->rate;
1165         }
1166         ieee80211_prepare_rates(local, mode);
1167
1168         if (!local->oper_hw_mode) {
1169                 /* Default to this mode */
1170                 local->hw.conf.phymode = mode->mode;
1171                 local->oper_hw_mode = local->scan_hw_mode = mode;
1172                 local->oper_channel = local->scan_channel = &mode->channels[0];
1173                 local->hw.conf.mode = local->oper_hw_mode;
1174                 local->hw.conf.chan = local->oper_channel;
1175         }
1176
1177         if (!(hw->flags & IEEE80211_HW_DEFAULT_REG_DOMAIN_CONFIGURED))
1178                 ieee80211_set_default_regdomain(mode);
1179
1180         return 0;
1181 }
1182 EXPORT_SYMBOL(ieee80211_register_hwmode);
1183
1184 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1185 {
1186         struct ieee80211_local *local = hw_to_local(hw);
1187         struct ieee80211_sub_if_data *sdata, *tmp;
1188         int i;
1189
1190         tasklet_kill(&local->tx_pending_tasklet);
1191         tasklet_kill(&local->tasklet);
1192
1193         rtnl_lock();
1194
1195         BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
1196
1197         local->reg_state = IEEE80211_DEV_UNREGISTERED;
1198
1199         /*
1200          * At this point, interface list manipulations are fine
1201          * because the driver cannot be handing us frames any
1202          * more and the tasklet is killed.
1203          */
1204
1205         /*
1206          * First, we remove all non-master interfaces. Do this because they
1207          * may have bss pointer dependency on the master, and when we free
1208          * the master these would be freed as well, breaking our list
1209          * iteration completely.
1210          */
1211         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1212                 if (sdata->dev == local->mdev)
1213                         continue;
1214                 list_del(&sdata->list);
1215                 __ieee80211_if_del(local, sdata);
1216         }
1217
1218         /* then, finally, remove the master interface */
1219         __ieee80211_if_del(local, IEEE80211_DEV_TO_SUB_IF(local->mdev));
1220
1221         rtnl_unlock();
1222
1223         ieee80211_rx_bss_list_deinit(local->mdev);
1224         ieee80211_clear_tx_pending(local);
1225         sta_info_stop(local);
1226         rate_control_deinitialize(local);
1227         debugfs_hw_del(local);
1228
1229         for (i = 0; i < NUM_IEEE80211_MODES; i++) {
1230                 kfree(local->supp_rates[i]);
1231                 kfree(local->basic_rates[i]);
1232         }
1233
1234         if (skb_queue_len(&local->skb_queue)
1235                         || skb_queue_len(&local->skb_queue_unreliable))
1236                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1237                        wiphy_name(local->hw.wiphy));
1238         skb_queue_purge(&local->skb_queue);
1239         skb_queue_purge(&local->skb_queue_unreliable);
1240
1241         destroy_workqueue(local->hw.workqueue);
1242         wiphy_unregister(local->hw.wiphy);
1243         ieee80211_wep_free(local);
1244         ieee80211_led_exit(local);
1245 }
1246 EXPORT_SYMBOL(ieee80211_unregister_hw);
1247
1248 void ieee80211_free_hw(struct ieee80211_hw *hw)
1249 {
1250         struct ieee80211_local *local = hw_to_local(hw);
1251
1252         ieee80211_if_free(local->mdev);
1253         wiphy_free(local->hw.wiphy);
1254 }
1255 EXPORT_SYMBOL(ieee80211_free_hw);
1256
1257 static int __init ieee80211_init(void)
1258 {
1259         struct sk_buff *skb;
1260         int ret;
1261
1262         BUILD_BUG_ON(sizeof(struct ieee80211_tx_packet_data) > sizeof(skb->cb));
1263
1264 #ifdef CONFIG_MAC80211_RCSIMPLE
1265         ret = ieee80211_rate_control_register(&mac80211_rcsimple);
1266         if (ret)
1267                 return ret;
1268 #endif
1269
1270         ret = ieee80211_wme_register();
1271         if (ret) {
1272 #ifdef CONFIG_MAC80211_RCSIMPLE
1273                 ieee80211_rate_control_unregister(&mac80211_rcsimple);
1274 #endif
1275                 printk(KERN_DEBUG "ieee80211_init: failed to "
1276                        "initialize WME (err=%d)\n", ret);
1277                 return ret;
1278         }
1279
1280         ieee80211_debugfs_netdev_init();
1281         ieee80211_regdomain_init();
1282
1283         return 0;
1284 }
1285
1286 static void __exit ieee80211_exit(void)
1287 {
1288 #ifdef CONFIG_MAC80211_RCSIMPLE
1289         ieee80211_rate_control_unregister(&mac80211_rcsimple);
1290 #endif
1291
1292         ieee80211_wme_unregister();
1293         ieee80211_debugfs_netdev_exit();
1294 }
1295
1296
1297 subsys_initcall(ieee80211_init);
1298 module_exit(ieee80211_exit);
1299
1300 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1301 MODULE_LICENSE("GPL");