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->scan_dev == sdata->dev) {
 354                         if (!local->ops->hw_scan) {
 355                                 local->sta_sw_scanning = 0;
 356                                 cancel_delayed_work(&local->scan_work);
 357                         } else
 358                                 local->sta_hw_scanning = 0;
 359                 }
 360
 361                 flush_workqueue(local->hw.workqueue);
 362
 363                 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
 364                 kfree(sdata->u.sta.extra_ie);
 365                 sdata->u.sta.extra_ie = NULL;
 366                 sdata->u.sta.extra_ie_len = 0;
 367                 /* fall through */
 368         default:
 369                 conf.if_id = dev->ifindex;
 370                 conf.type = sdata->type;
 371                 conf.mac_addr = dev->dev_addr;
 372                 /* disable all keys for as long as this netdev is down */
 373                 ieee80211_disable_keys(sdata);
 374                 local->ops->remove_interface(local_to_hw(local), &conf);
 375         }
 376
 377         if (local->open_count == 0) {
 378                 if (netif_running(local->mdev))
 379                         dev_close(local->mdev);
 380
 381                 if (local->ops->stop)
 382                         local->ops->stop(local_to_hw(local));
 383
 384                 tasklet_disable(&local->tx_pending_tasklet);
 385                 tasklet_disable(&local->tasklet);
 386         }
 387
 388         return 0;
 389 }
 390
 391 static void ieee80211_set_multicast_list(struct net_device *dev)
 392 {
 393         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 394         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 395         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 396
 397         allmulti = !!(dev->flags & IFF_ALLMULTI);
 398         promisc = !!(dev->flags & IFF_PROMISC);
 399         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 400         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 401
 402         if (allmulti != sdata_allmulti) {
 403                 if (dev->flags & IFF_ALLMULTI)
 404                         atomic_inc(&local->iff_allmultis);
 405                 else
 406                         atomic_dec(&local->iff_allmultis);
 407                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 408         }
 409
 410         if (promisc != sdata_promisc) {
 411                 if (dev->flags & IFF_PROMISC)
 412                         atomic_inc(&local->iff_promiscs);
 413                 else
 414                         atomic_dec(&local->iff_promiscs);
 415                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 416         }
 417
 418         dev_mc_sync(local->mdev, dev);
 419 }
 420
 421 static const struct header_ops ieee80211_header_ops = {
 422         .create         = eth_header,
 423         .parse          = header_parse_80211,
 424         .rebuild        = eth_rebuild_header,
 425         .cache          = eth_header_cache,
 426         .cache_update   = eth_header_cache_update,
 427 };
 428
 429 /* Must not be called for mdev */
 430 void ieee80211_if_setup(struct net_device *dev)
 431 {
 432         ether_setup(dev);
 433         dev->hard_start_xmit = ieee80211_subif_start_xmit;
 434         dev->wireless_handlers = &ieee80211_iw_handler_def;
 435         dev->set_multicast_list = ieee80211_set_multicast_list;
 436         dev->change_mtu = ieee80211_change_mtu;
 437         dev->open = ieee80211_open;
 438         dev->stop = ieee80211_stop;
 439         dev->destructor = ieee80211_if_free;
 440 }
 441
 442 /* WDS specialties */
 443
 444 int ieee80211_if_update_wds(struct net_device *dev, u8 *remote_addr)
 445 {
 446         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 447         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 448         struct sta_info *sta;
 449         DECLARE_MAC_BUF(mac);
 450
 451         if (compare_ether_addr(remote_addr, sdata->u.wds.remote_addr) == 0)
 452                 return 0;
 453
 454         /* Create STA entry for the new peer */
 455         sta = sta_info_add(local, dev, remote_addr, GFP_KERNEL);
 456         if (!sta)
 457                 return -ENOMEM;
 458         sta_info_put(sta);
 459
 460         /* Remove STA entry for the old peer */
 461         sta = sta_info_get(local, sdata->u.wds.remote_addr);
 462         if (sta) {
 463                 sta_info_free(sta);
 464                 sta_info_put(sta);
 465         } else {
 466                 printk(KERN_DEBUG "%s: could not find STA entry for WDS link "
 467                        "peer %s\n",
 468                        dev->name, print_mac(mac, sdata->u.wds.remote_addr));
 469         }
 470
 471         /* Update WDS link data */
 472         memcpy(&sdata->u.wds.remote_addr, remote_addr, ETH_ALEN);
 473
 474         return 0;
 475 }
 476
 477 /* everything else */
 478
 479 static int __ieee80211_if_config(struct net_device *dev,
 480                                  struct sk_buff *beacon,
 481                                  struct ieee80211_tx_control *control)
 482 {
 483         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 484         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 485         struct ieee80211_if_conf conf;
 486
 487         if (!local->ops->config_interface || !netif_running(dev))
 488                 return 0;
 489
 490         memset(&conf, 0, sizeof(conf));
 491         conf.type = sdata->type;
 492         if (sdata->type == IEEE80211_IF_TYPE_STA ||
 493             sdata->type == IEEE80211_IF_TYPE_IBSS) {
 494                 conf.bssid = sdata->u.sta.bssid;
 495                 conf.ssid = sdata->u.sta.ssid;
 496                 conf.ssid_len = sdata->u.sta.ssid_len;
 497         } else if (sdata->type == IEEE80211_IF_TYPE_AP) {
 498                 conf.ssid = sdata->u.ap.ssid;
 499                 conf.ssid_len = sdata->u.ap.ssid_len;
 500                 conf.beacon = beacon;
 501                 conf.beacon_control = control;
 502         }
 503         return local->ops->config_interface(local_to_hw(local),
 504                                            dev->ifindex, &conf);
 505 }
 506
 507 int ieee80211_if_config(struct net_device *dev)
 508 {
 509         return __ieee80211_if_config(dev, NULL, NULL);
 510 }
 511
 512 int ieee80211_if_config_beacon(struct net_device *dev)
 513 {
 514         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 515         struct ieee80211_tx_control control;
 516         struct sk_buff *skb;
 517
 518         if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
 519                 return 0;
 520         skb = ieee80211_beacon_get(local_to_hw(local), dev->ifindex, &control);
 521         if (!skb)
 522                 return -ENOMEM;
 523         return __ieee80211_if_config(dev, skb, &control);
 524 }
 525
 526 int ieee80211_hw_config(struct ieee80211_local *local)
 527 {
 528         struct ieee80211_hw_mode *mode;
 529         struct ieee80211_channel *chan;
 530         int ret = 0;
 531
 532         if (local->sta_sw_scanning) {
 533                 chan = local->scan_channel;
 534                 mode = local->scan_hw_mode;
 535         } else {
 536                 chan = local->oper_channel;
 537                 mode = local->oper_hw_mode;
 538         }
 539
 540         local->hw.conf.channel = chan->chan;
 541         local->hw.conf.channel_val = chan->val;
 542         if (!local->hw.conf.power_level) {
 543                 local->hw.conf.power_level = chan->power_level;
 544         } else {
 545                 local->hw.conf.power_level = min(chan->power_level,
 546                                                  local->hw.conf.power_level);
 547         }
 548         local->hw.conf.freq = chan->freq;
 549         local->hw.conf.phymode = mode->mode;
 550         local->hw.conf.antenna_max = chan->antenna_max;
 551         local->hw.conf.chan = chan;
 552         local->hw.conf.mode = mode;
 553
 554 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 555         printk(KERN_DEBUG "HW CONFIG: channel=%d freq=%d "
 556                "phymode=%d\n", local->hw.conf.channel, local->hw.conf.freq,
 557                local->hw.conf.phymode);
 558 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 559
 560         if (local->open_count)
 561                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
 562
 563         return ret;
 564 }
 565
 566 void ieee80211_erp_info_change_notify(struct net_device *dev, u8 changes)
 567 {
 568         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 569         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 570         if (local->ops->erp_ie_changed)
 571                 local->ops->erp_ie_changed(local_to_hw(local), changes,
 572                         !!(sdata->flags & IEEE80211_SDATA_USE_PROTECTION),
 573                         !(sdata->flags & IEEE80211_SDATA_SHORT_PREAMBLE));
 574 }
 575
 576 void ieee80211_reset_erp_info(struct net_device *dev)
 577 {
 578         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 579
 580         sdata->flags &= ~(IEEE80211_SDATA_USE_PROTECTION |
 581                         IEEE80211_SDATA_SHORT_PREAMBLE);
 582         ieee80211_erp_info_change_notify(dev,
 583                                          IEEE80211_ERP_CHANGE_PROTECTION |
 584                                          IEEE80211_ERP_CHANGE_PREAMBLE);
 585 }
 586
 587 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 588                                  struct sk_buff *skb,
 589                                  struct ieee80211_tx_status *status)
 590 {
 591         struct ieee80211_local *local = hw_to_local(hw);
 592         struct ieee80211_tx_status *saved;
 593         int tmp;
 594
 595         skb->dev = local->mdev;
 596         saved = kmalloc(sizeof(struct ieee80211_tx_status), GFP_ATOMIC);
 597         if (unlikely(!saved)) {
 598                 if (net_ratelimit())
 599                         printk(KERN_WARNING "%s: Not enough memory, "
 600                                "dropping tx status", skb->dev->name);
 601                 /* should be dev_kfree_skb_irq, but due to this function being
 602                  * named _irqsafe instead of just _irq we can't be sure that
 603                  * people won't call it from non-irq contexts */
 604                 dev_kfree_skb_any(skb);
 605                 return;
 606         }
 607         memcpy(saved, status, sizeof(struct ieee80211_tx_status));
 608         /* copy pointer to saved status into skb->cb for use by tasklet */
 609         memcpy(skb->cb, &saved, sizeof(saved));
 610
 611         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 612         skb_queue_tail(status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS ?
 613                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 614         tmp = skb_queue_len(&local->skb_queue) +
 615                 skb_queue_len(&local->skb_queue_unreliable);
 616         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 617                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 618                 memcpy(&saved, skb->cb, sizeof(saved));
 619                 kfree(saved);
 620                 dev_kfree_skb_irq(skb);
 621                 tmp--;
 622                 I802_DEBUG_INC(local->tx_status_drop);
 623         }
 624         tasklet_schedule(&local->tasklet);
 625 }
 626 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 627
 628 static void ieee80211_tasklet_handler(unsigned long data)
 629 {
 630         struct ieee80211_local *local = (struct ieee80211_local *) data;
 631         struct sk_buff *skb;
 632         struct ieee80211_rx_status rx_status;
 633         struct ieee80211_tx_status *tx_status;
 634
 635         while ((skb = skb_dequeue(&local->skb_queue)) ||
 636                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 637                 switch (skb->pkt_type) {
 638                 case IEEE80211_RX_MSG:
 639                         /* status is in skb->cb */
 640                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 641                         /* Clear skb->type in order to not confuse kernel
 642                          * netstack. */
 643                         skb->pkt_type = 0;
 644                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 645                         break;
 646                 case IEEE80211_TX_STATUS_MSG:
 647                         /* get pointer to saved status out of skb->cb */
 648                         memcpy(&tx_status, skb->cb, sizeof(tx_status));
 649                         skb->pkt_type = 0;
 650                         ieee80211_tx_status(local_to_hw(local),
 651                                             skb, tx_status);
 652                         kfree(tx_status);
 653                         break;
 654                 default: /* should never get here! */
 655                         printk(KERN_ERR "%s: Unknown message type (%d)\n",
 656                                wiphy_name(local->hw.wiphy), skb->pkt_type);
 657                         dev_kfree_skb(skb);
 658                         break;
 659                 }
 660         }
 661 }
 662
 663 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 664  * make a prepared TX frame (one that has been given to hw) to look like brand
 665  * new IEEE 802.11 frame that is ready to go through TX processing again.
 666  * Also, tx_packet_data in cb is restored from tx_control. */
 667 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 668                                       struct ieee80211_key *key,
 669                                       struct sk_buff *skb,
 670                                       struct ieee80211_tx_control *control)
 671 {
 672         int hdrlen, iv_len, mic_len;
 673         struct ieee80211_tx_packet_data *pkt_data;
 674
 675         pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
 676         pkt_data->ifindex = control->ifindex;
 677         pkt_data->flags = 0;
 678         if (control->flags & IEEE80211_TXCTL_REQ_TX_STATUS)
 679                 pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
 680         if (control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT)
 681                 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
 682         if (control->flags & IEEE80211_TXCTL_REQUEUE)
 683                 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
 684         pkt_data->queue = control->queue;
 685
 686         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 687
 688         if (!key)
 689                 goto no_key;
 690
 691         switch (key->conf.alg) {
 692         case ALG_WEP:
 693                 iv_len = WEP_IV_LEN;
 694                 mic_len = WEP_ICV_LEN;
 695                 break;
 696         case ALG_TKIP:
 697                 iv_len = TKIP_IV_LEN;
 698                 mic_len = TKIP_ICV_LEN;
 699                 break;
 700         case ALG_CCMP:
 701                 iv_len = CCMP_HDR_LEN;
 702                 mic_len = CCMP_MIC_LEN;
 703                 break;
 704         default:
 705                 goto no_key;
 706         }
 707
 708         if (skb->len >= mic_len &&
 709             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 710                 skb_trim(skb, skb->len - mic_len);
 711         if (skb->len >= iv_len && skb->len > hdrlen) {
 712                 memmove(skb->data + iv_len, skb->data, hdrlen);
 713                 skb_pull(skb, iv_len);
 714         }
 715
 716 no_key:
 717         {
 718                 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 719                 u16 fc = le16_to_cpu(hdr->frame_control);
 720                 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
 721                         fc &= ~IEEE80211_STYPE_QOS_DATA;
 722                         hdr->frame_control = cpu_to_le16(fc);
 723                         memmove(skb->data + 2, skb->data, hdrlen - 2);
 724                         skb_pull(skb, 2);
 725                 }
 726         }
 727 }
 728
 729 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
 730                          struct ieee80211_tx_status *status)
 731 {
 732         struct sk_buff *skb2;
 733         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 734         struct ieee80211_local *local = hw_to_local(hw);
 735         u16 frag, type;
 736         struct ieee80211_tx_status_rtap_hdr *rthdr;
 737         struct ieee80211_sub_if_data *sdata;
 738         int monitors;
 739
 740         if (!status) {
 741                 printk(KERN_ERR
 742                        "%s: ieee80211_tx_status called with NULL status\n",
 743                        wiphy_name(local->hw.wiphy));
 744                 dev_kfree_skb(skb);
 745                 return;
 746         }
 747
 748         if (status->excessive_retries) {
 749                 struct sta_info *sta;
 750                 sta = sta_info_get(local, hdr->addr1);
 751                 if (sta) {
 752                         if (sta->flags & WLAN_STA_PS) {
 753                                 /* The STA is in power save mode, so assume
 754                                  * that this TX packet failed because of that.
 755                                  */
 756                                 status->excessive_retries = 0;
 757                                 status->flags |= IEEE80211_TX_STATUS_TX_FILTERED;
 758                         }
 759                         sta_info_put(sta);
 760                 }
 761         }
 762
 763         if (status->flags & IEEE80211_TX_STATUS_TX_FILTERED) {
 764                 struct sta_info *sta;
 765                 sta = sta_info_get(local, hdr->addr1);
 766                 if (sta) {
 767                         sta->tx_filtered_count++;
 768
 769                         /* Clear the TX filter mask for this STA when sending
 770                          * the next packet. If the STA went to power save mode,
 771                          * this will happen when it is waking up for the next
 772                          * time. */
 773                         sta->clear_dst_mask = 1;
 774
 775                         /* TODO: Is the WLAN_STA_PS flag always set here or is
 776                          * the race between RX and TX status causing some
 777                          * packets to be filtered out before 80211.o gets an
 778                          * update for PS status? This seems to be the case, so
 779                          * no changes are likely to be needed. */
 780                         if (sta->flags & WLAN_STA_PS &&
 781                             skb_queue_len(&sta->tx_filtered) <
 782                             STA_MAX_TX_BUFFER) {
 783                                 ieee80211_remove_tx_extra(local, sta->key,
 784                                                           skb,
 785                                                           &status->control);
 786                                 skb_queue_tail(&sta->tx_filtered, skb);
 787                         } else if (!(sta->flags & WLAN_STA_PS) &&
 788                                    !(status->control.flags & IEEE80211_TXCTL_REQUEUE)) {
 789                                 /* Software retry the packet once */
 790                                 status->control.flags |= IEEE80211_TXCTL_REQUEUE;
 791                                 ieee80211_remove_tx_extra(local, sta->key,
 792                                                           skb,
 793                                                           &status->control);
 794                                 dev_queue_xmit(skb);
 795                         } else {
 796                                 if (net_ratelimit()) {
 797                                         printk(KERN_DEBUG "%s: dropped TX "
 798                                                "filtered frame queue_len=%d "
 799                                                "PS=%d @%lu\n",
 800                                                wiphy_name(local->hw.wiphy),
 801                                                skb_queue_len(
 802                                                        &sta->tx_filtered),
 803                                                !!(sta->flags & WLAN_STA_PS),
 804                                                jiffies);
 805                                 }
 806                                 dev_kfree_skb(skb);
 807                         }
 808                         sta_info_put(sta);
 809                         return;
 810                 }
 811         } else {
 812                 /* FIXME: STUPID to call this with both local and local->mdev */
 813                 rate_control_tx_status(local, local->mdev, skb, status);
 814         }
 815
 816         ieee80211_led_tx(local, 0);
 817
 818         /* SNMP counters
 819          * Fragments are passed to low-level drivers as separate skbs, so these
 820          * are actually fragments, not frames. Update frame counters only for
 821          * the first fragment of the frame. */
 822
 823         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 824         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 825
 826         if (status->flags & IEEE80211_TX_STATUS_ACK) {
 827                 if (frag == 0) {
 828                         local->dot11TransmittedFrameCount++;
 829                         if (is_multicast_ether_addr(hdr->addr1))
 830                                 local->dot11MulticastTransmittedFrameCount++;
 831                         if (status->retry_count > 0)
 832                                 local->dot11RetryCount++;
 833                         if (status->retry_count > 1)
 834                                 local->dot11MultipleRetryCount++;
 835                 }
 836
 837                 /* This counter shall be incremented for an acknowledged MPDU
 838                  * with an individual address in the address 1 field or an MPDU
 839                  * with a multicast address in the address 1 field of type Data
 840                  * or Management. */
 841                 if (!is_multicast_ether_addr(hdr->addr1) ||
 842                     type == IEEE80211_FTYPE_DATA ||
 843                     type == IEEE80211_FTYPE_MGMT)
 844                         local->dot11TransmittedFragmentCount++;
 845         } else {
 846                 if (frag == 0)
 847                         local->dot11FailedCount++;
 848         }
 849
 850         /* this was a transmitted frame, but now we want to reuse it */
 851         skb_orphan(skb);
 852
 853         if (!local->monitors) {
 854                 dev_kfree_skb(skb);
 855                 return;
 856         }
 857
 858         /* send frame to monitor interfaces now */
 859
 860         if (skb_headroom(skb) < sizeof(*rthdr)) {
 861                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 862                 dev_kfree_skb(skb);
 863                 return;
 864         }
 865
 866         rthdr = (struct ieee80211_tx_status_rtap_hdr*)
 867                                 skb_push(skb, sizeof(*rthdr));
 868
 869         memset(rthdr, 0, sizeof(*rthdr));
 870         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 871         rthdr->hdr.it_present =
 872                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 873                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
 874
 875         if (!(status->flags & IEEE80211_TX_STATUS_ACK) &&
 876             !is_multicast_ether_addr(hdr->addr1))
 877                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 878
 879         if ((status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) &&
 880             (status->control.flags & IEEE80211_TXCTL_USE_CTS_PROTECT))
 881                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 882         else if (status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS)
 883                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 884
 885         rthdr->data_retries = status->retry_count;
 886
 887         rcu_read_lock();
 888         monitors = local->monitors;
 889         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 890                 /*
 891                  * Using the monitors counter is possibly racy, but
 892                  * if the value is wrong we simply either clone the skb
 893                  * once too much or forget sending it to one monitor iface
 894                  * The latter case isn't nice but fixing the race is much
 895                  * more complicated.
 896                  */
 897                 if (!monitors || !skb)
 898                         goto out;
 899
 900                 if (sdata->type == IEEE80211_IF_TYPE_MNTR) {
 901                         if (!netif_running(sdata->dev))
 902                                 continue;
 903                         monitors--;
 904                         if (monitors)
 905                                 skb2 = skb_clone(skb, GFP_ATOMIC);
 906                         else
 907                                 skb2 = NULL;
 908                         skb->dev = sdata->dev;
 909                         /* XXX: is this sufficient for BPF? */
 910                         skb_set_mac_header(skb, 0);
 911                         skb->ip_summed = CHECKSUM_UNNECESSARY;
 912                         skb->pkt_type = PACKET_OTHERHOST;
 913                         skb->protocol = htons(ETH_P_802_2);
 914                         memset(skb->cb, 0, sizeof(skb->cb));
 915                         netif_rx(skb);
 916                         skb = skb2;
 917                 }
 918         }
 919  out:
 920         rcu_read_unlock();
 921         if (skb)
 922                 dev_kfree_skb(skb);
 923 }
 924 EXPORT_SYMBOL(ieee80211_tx_status);
 925
 926 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
 927                                         const struct ieee80211_ops *ops)
 928 {
 929         struct net_device *mdev;
 930         struct ieee80211_local *local;
 931         struct ieee80211_sub_if_data *sdata;
 932         int priv_size;
 933         struct wiphy *wiphy;
 934
 935         /* Ensure 32-byte alignment of our private data and hw private data.
 936          * We use the wiphy priv data for both our ieee80211_local and for
 937          * the driver's private data
 938          *
 939          * In memory it'll be like this:
 940          *
 941          * +-------------------------+
 942          * | struct wiphy           |
 943          * +-------------------------+
 944          * | struct ieee80211_local  |
 945          * +-------------------------+
 946          * | driver's private data   |
 947          * +-------------------------+
 948          *
 949          */
 950         priv_size = ((sizeof(struct ieee80211_local) +
 951                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
 952                     priv_data_len;
 953
 954         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
 955
 956         if (!wiphy)
 957                 return NULL;
 958
 959         wiphy->privid = mac80211_wiphy_privid;
 960
 961         local = wiphy_priv(wiphy);
 962         local->hw.wiphy = wiphy;
 963
 964         local->hw.priv = (char *)local +
 965                          ((sizeof(struct ieee80211_local) +
 966                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
 967
 968         BUG_ON(!ops->tx);
 969         BUG_ON(!ops->start);
 970         BUG_ON(!ops->stop);
 971         BUG_ON(!ops->config);
 972         BUG_ON(!ops->add_interface);
 973         BUG_ON(!ops->remove_interface);
 974         BUG_ON(!ops->configure_filter);
 975         local->ops = ops;
 976
 977         /* for now, mdev needs sub_if_data :/ */
 978         mdev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
 979                             "wmaster%d", ether_setup);
 980         if (!mdev) {
 981                 wiphy_free(wiphy);
 982                 return NULL;
 983         }
 984
 985         sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
 986         mdev->ieee80211_ptr = &sdata->wdev;
 987         sdata->wdev.wiphy = wiphy;
 988
 989         local->hw.queues = 1; /* default */
 990
 991         local->mdev = mdev;
 992         local->rx_pre_handlers = ieee80211_rx_pre_handlers;
 993         local->rx_handlers = ieee80211_rx_handlers;
 994         local->tx_handlers = ieee80211_tx_handlers;
 995
 996         local->bridge_packets = 1;
 997
 998         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
 999         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1000         local->short_retry_limit = 7;
1001         local->long_retry_limit = 4;
1002         local->hw.conf.radio_enabled = 1;
1003
1004         local->enabled_modes = ~0;
1005
1006         INIT_LIST_HEAD(&local->modes_list);
1007
1008         INIT_LIST_HEAD(&local->interfaces);
1009
1010         INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1011         ieee80211_rx_bss_list_init(mdev);
1012
1013         sta_info_init(local);
1014
1015         mdev->hard_start_xmit = ieee80211_master_start_xmit;
1016         mdev->open = ieee80211_master_open;
1017         mdev->stop = ieee80211_master_stop;
1018         mdev->type = ARPHRD_IEEE80211;
1019         mdev->header_ops = &ieee80211_header_ops;
1020         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
1021
1022         sdata->type = IEEE80211_IF_TYPE_AP;
1023         sdata->dev = mdev;
1024         sdata->local = local;
1025         sdata->u.ap.force_unicast_rateidx = -1;
1026         sdata->u.ap.max_ratectrl_rateidx = -1;
1027         ieee80211_if_sdata_init(sdata);
1028         /* no RCU needed since we're still during init phase */
1029         list_add_tail(&sdata->list, &local->interfaces);
1030
1031         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1032                      (unsigned long)local);
1033         tasklet_disable(&local->tx_pending_tasklet);
1034
1035         tasklet_init(&local->tasklet,
1036                      ieee80211_tasklet_handler,
1037                      (unsigned long) local);
1038         tasklet_disable(&local->tasklet);
1039
1040         skb_queue_head_init(&local->skb_queue);
1041         skb_queue_head_init(&local->skb_queue_unreliable);
1042
1043         return local_to_hw(local);
1044 }
1045 EXPORT_SYMBOL(ieee80211_alloc_hw);
1046
1047 int ieee80211_register_hw(struct ieee80211_hw *hw)
1048 {
1049         struct ieee80211_local *local = hw_to_local(hw);
1050         const char *name;
1051         int result;
1052
1053         result = wiphy_register(local->hw.wiphy);
1054         if (result < 0)
1055                 return result;
1056
1057         name = wiphy_dev(local->hw.wiphy)->driver->name;
1058         local->hw.workqueue = create_singlethread_workqueue(name);
1059         if (!local->hw.workqueue) {
1060                 result = -ENOMEM;
1061                 goto fail_workqueue;
1062         }
1063
1064         /*
1065          * The hardware needs headroom for sending the frame,
1066          * and we need some headroom for passing the frame to monitor
1067          * interfaces, but never both at the same time.
1068          */
1069         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1070                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
1071
1072         debugfs_hw_add(local);
1073
1074         local->hw.conf.beacon_int = 1000;
1075
1076         local->wstats_flags |= local->hw.max_rssi ?
1077                                IW_QUAL_LEVEL_UPDATED : IW_QUAL_LEVEL_INVALID;
1078         local->wstats_flags |= local->hw.max_signal ?
1079                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1080         local->wstats_flags |= local->hw.max_noise ?
1081                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1082         if (local->hw.max_rssi < 0 || local->hw.max_noise < 0)
1083                 local->wstats_flags |= IW_QUAL_DBM;
1084
1085         result = sta_info_start(local);
1086         if (result < 0)
1087                 goto fail_sta_info;
1088
1089         rtnl_lock();
1090         result = dev_alloc_name(local->mdev, local->mdev->name);
1091         if (result < 0)
1092                 goto fail_dev;
1093
1094         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1095         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1096
1097         result = register_netdevice(local->mdev);
1098         if (result < 0)
1099                 goto fail_dev;
1100
1101         ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1102         ieee80211_if_set_type(local->mdev, IEEE80211_IF_TYPE_AP);
1103
1104         result = ieee80211_init_rate_ctrl_alg(local,
1105                                               hw->rate_control_algorithm);
1106         if (result < 0) {
1107                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1108                        "algorithm\n", wiphy_name(local->hw.wiphy));
1109                 goto fail_rate;
1110         }
1111
1112         result = ieee80211_wep_init(local);
1113
1114         if (result < 0) {
1115                 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1116                        wiphy_name(local->hw.wiphy));
1117                 goto fail_wep;
1118         }
1119
1120         ieee80211_install_qdisc(local->mdev);
1121
1122         /* add one default STA interface */
1123         result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
1124                                   IEEE80211_IF_TYPE_STA);
1125         if (result)
1126                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1127                        wiphy_name(local->hw.wiphy));
1128
1129         local->reg_state = IEEE80211_DEV_REGISTERED;
1130         rtnl_unlock();
1131
1132         ieee80211_led_init(local);
1133
1134         return 0;
1135
1136 fail_wep:
1137         rate_control_deinitialize(local);
1138 fail_rate:
1139         ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1140         unregister_netdevice(local->mdev);
1141 fail_dev:
1142         rtnl_unlock();
1143         sta_info_stop(local);
1144 fail_sta_info:
1145         debugfs_hw_del(local);
1146         destroy_workqueue(local->hw.workqueue);
1147 fail_workqueue:
1148         wiphy_unregister(local->hw.wiphy);
1149         return result;
1150 }
1151 EXPORT_SYMBOL(ieee80211_register_hw);
1152
1153 int ieee80211_register_hwmode(struct ieee80211_hw *hw,
1154                               struct ieee80211_hw_mode *mode)
1155 {
1156         struct ieee80211_local *local = hw_to_local(hw);
1157         struct ieee80211_rate *rate;
1158         int i;
1159
1160         INIT_LIST_HEAD(&mode->list);
1161         list_add_tail(&mode->list, &local->modes_list);
1162
1163         local->hw_modes |= (1 << mode->mode);
1164         for (i = 0; i < mode->num_rates; i++) {
1165                 rate = &(mode->rates[i]);
1166                 rate->rate_inv = CHAN_UTIL_RATE_LCM / rate->rate;
1167         }
1168         ieee80211_prepare_rates(local, mode);
1169
1170         if (!local->oper_hw_mode) {
1171                 /* Default to this mode */
1172                 local->hw.conf.phymode = mode->mode;
1173                 local->oper_hw_mode = local->scan_hw_mode = mode;
1174                 local->oper_channel = local->scan_channel = &mode->channels[0];
1175                 local->hw.conf.mode = local->oper_hw_mode;
1176                 local->hw.conf.chan = local->oper_channel;
1177         }
1178
1179         if (!(hw->flags & IEEE80211_HW_DEFAULT_REG_DOMAIN_CONFIGURED))
1180                 ieee80211_set_default_regdomain(mode);
1181
1182         return 0;
1183 }
1184 EXPORT_SYMBOL(ieee80211_register_hwmode);
1185
1186 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1187 {
1188         struct ieee80211_local *local = hw_to_local(hw);
1189         struct ieee80211_sub_if_data *sdata, *tmp;
1190         int i;
1191
1192         tasklet_kill(&local->tx_pending_tasklet);
1193         tasklet_kill(&local->tasklet);
1194
1195         rtnl_lock();
1196
1197         BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
1198
1199         local->reg_state = IEEE80211_DEV_UNREGISTERED;
1200
1201         /*
1202          * At this point, interface list manipulations are fine
1203          * because the driver cannot be handing us frames any
1204          * more and the tasklet is killed.
1205          */
1206
1207         /*
1208          * First, we remove all non-master interfaces. Do this because they
1209          * may have bss pointer dependency on the master, and when we free
1210          * the master these would be freed as well, breaking our list
1211          * iteration completely.
1212          */
1213         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1214                 if (sdata->dev == local->mdev)
1215                         continue;
1216                 list_del(&sdata->list);
1217                 __ieee80211_if_del(local, sdata);
1218         }
1219
1220         /* then, finally, remove the master interface */
1221         __ieee80211_if_del(local, IEEE80211_DEV_TO_SUB_IF(local->mdev));
1222
1223         rtnl_unlock();
1224
1225         ieee80211_rx_bss_list_deinit(local->mdev);
1226         ieee80211_clear_tx_pending(local);
1227         sta_info_stop(local);
1228         rate_control_deinitialize(local);
1229         debugfs_hw_del(local);
1230
1231         for (i = 0; i < NUM_IEEE80211_MODES; i++) {
1232                 kfree(local->supp_rates[i]);
1233                 kfree(local->basic_rates[i]);
1234         }
1235
1236         if (skb_queue_len(&local->skb_queue)
1237                         || skb_queue_len(&local->skb_queue_unreliable))
1238                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1239                        wiphy_name(local->hw.wiphy));
1240         skb_queue_purge(&local->skb_queue);
1241         skb_queue_purge(&local->skb_queue_unreliable);
1242
1243         destroy_workqueue(local->hw.workqueue);
1244         wiphy_unregister(local->hw.wiphy);
1245         ieee80211_wep_free(local);
1246         ieee80211_led_exit(local);
1247 }
1248 EXPORT_SYMBOL(ieee80211_unregister_hw);
1249
1250 void ieee80211_free_hw(struct ieee80211_hw *hw)
1251 {
1252         struct ieee80211_local *local = hw_to_local(hw);
1253
1254         ieee80211_if_free(local->mdev);
1255         wiphy_free(local->hw.wiphy);
1256 }
1257 EXPORT_SYMBOL(ieee80211_free_hw);
1258
1259 static int __init ieee80211_init(void)
1260 {
1261         struct sk_buff *skb;
1262         int ret;
1263
1264         BUILD_BUG_ON(sizeof(struct ieee80211_tx_packet_data) > sizeof(skb->cb));
1265
1266 #ifdef CONFIG_MAC80211_RCSIMPLE
1267         ret = ieee80211_rate_control_register(&mac80211_rcsimple);
1268         if (ret)
1269                 return ret;
1270 #endif
1271
1272         ret = ieee80211_wme_register();
1273         if (ret) {
1274 #ifdef CONFIG_MAC80211_RCSIMPLE
1275                 ieee80211_rate_control_unregister(&mac80211_rcsimple);
1276 #endif
1277                 printk(KERN_DEBUG "ieee80211_init: failed to "
1278                        "initialize WME (err=%d)\n", ret);
1279                 return ret;
1280         }
1281
1282         ieee80211_debugfs_netdev_init();
1283         ieee80211_regdomain_init();
1284
1285         return 0;
1286 }
1287
1288 static void __exit ieee80211_exit(void)
1289 {
1290 #ifdef CONFIG_MAC80211_RCSIMPLE
1291         ieee80211_rate_control_unregister(&mac80211_rcsimple);
1292 #endif
1293
1294         ieee80211_wme_unregister();
1295         ieee80211_debugfs_netdev_exit();
1296 }
1297
1298
1299 subsys_initcall(ieee80211_init);
1300 module_exit(ieee80211_exit);
1301
1302 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1303 MODULE_LICENSE("GPL");