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 #define SUPP_MCS_SET_LEN 16
  38
  39 /*
  40  * For seeing transmitted packets on monitor interfaces
  41  * we have a radiotap header too.
  42  */
  43 struct ieee80211_tx_status_rtap_hdr {
  44         struct ieee80211_radiotap_header hdr;
  45         __le16 tx_flags;
  46         u8 data_retries;
  47 } __attribute__ ((packed));
  48
  49 /* common interface routines */
  50
  51 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
  52 {
  53         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
  54         return ETH_ALEN;
  55 }
  56
  57 /* must be called under mdev tx lock */
  58 static void ieee80211_configure_filter(struct ieee80211_local *local)
  59 {
  60         unsigned int changed_flags;
  61         unsigned int new_flags = 0;
  62
  63         if (atomic_read(&local->iff_promiscs))
  64                 new_flags |= FIF_PROMISC_IN_BSS;
  65
  66         if (atomic_read(&local->iff_allmultis))
  67                 new_flags |= FIF_ALLMULTI;
  68
  69         if (local->monitors)
  70                 new_flags |= FIF_CONTROL |
  71                              FIF_OTHER_BSS |
  72                              FIF_BCN_PRBRESP_PROMISC;
  73
  74         changed_flags = local->filter_flags ^ new_flags;
  75
  76         /* be a bit nasty */
  77         new_flags |= (1<<31);
  78
  79         local->ops->configure_filter(local_to_hw(local),
  80                                      changed_flags, &new_flags,
  81                                      local->mdev->mc_count,
  82                                      local->mdev->mc_list);
  83
  84         WARN_ON(new_flags & (1<<31));
  85
  86         local->filter_flags = new_flags & ~(1<<31);
  87 }
  88
  89 /* master interface */
  90
  91 static int ieee80211_master_open(struct net_device *dev)
  92 {
  93         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
  94         struct ieee80211_sub_if_data *sdata;
  95         int res = -EOPNOTSUPP;
  96
  97         /* we hold the RTNL here so can safely walk the list */
  98         list_for_each_entry(sdata, &local->interfaces, list) {
  99                 if (sdata->dev != dev && netif_running(sdata->dev)) {
 100                         res = 0;
 101                         break;
 102                 }
 103         }
 104         return res;
 105 }
 106
 107 static int ieee80211_master_stop(struct net_device *dev)
 108 {
 109         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 110         struct ieee80211_sub_if_data *sdata;
 111
 112         /* we hold the RTNL here so can safely walk the list */
 113         list_for_each_entry(sdata, &local->interfaces, list)
 114                 if (sdata->dev != dev && netif_running(sdata->dev))
 115                         dev_close(sdata->dev);
 116
 117         return 0;
 118 }
 119
 120 static void ieee80211_master_set_multicast_list(struct net_device *dev)
 121 {
 122         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 123
 124         ieee80211_configure_filter(local);
 125 }
 126
 127 /* regular interfaces */
 128
 129 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 130 {
 131         /* FIX: what would be proper limits for MTU?
 132          * This interface uses 802.3 frames. */
 133         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6) {
 134                 printk(KERN_WARNING "%s: invalid MTU %d\n",
 135                        dev->name, new_mtu);
 136                 return -EINVAL;
 137         }
 138
 139 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 140         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
 141 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 142         dev->mtu = new_mtu;
 143         return 0;
 144 }
 145
 146 static inline int identical_mac_addr_allowed(int type1, int type2)
 147 {
 148         return (type1 == IEEE80211_IF_TYPE_MNTR ||
 149                 type2 == IEEE80211_IF_TYPE_MNTR ||
 150                 (type1 == IEEE80211_IF_TYPE_AP &&
 151                  type2 == IEEE80211_IF_TYPE_WDS) ||
 152                 (type1 == IEEE80211_IF_TYPE_WDS &&
 153                  (type2 == IEEE80211_IF_TYPE_WDS ||
 154                   type2 == IEEE80211_IF_TYPE_AP)) ||
 155                 (type1 == IEEE80211_IF_TYPE_AP &&
 156                  type2 == IEEE80211_IF_TYPE_VLAN) ||
 157                 (type1 == IEEE80211_IF_TYPE_VLAN &&
 158                  (type2 == IEEE80211_IF_TYPE_AP ||
 159                   type2 == IEEE80211_IF_TYPE_VLAN)));
 160 }
 161
 162 static int ieee80211_open(struct net_device *dev)
 163 {
 164         struct ieee80211_sub_if_data *sdata, *nsdata;
 165         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 166         struct ieee80211_if_init_conf conf;
 167         int res;
 168         bool need_hw_reconfig = 0;
 169
 170         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 171
 172         /* we hold the RTNL here so can safely walk the list */
 173         list_for_each_entry(nsdata, &local->interfaces, list) {
 174                 struct net_device *ndev = nsdata->dev;
 175
 176                 if (ndev != dev && ndev != local->mdev && netif_running(ndev) &&
 177                     compare_ether_addr(dev->dev_addr, ndev->dev_addr) == 0) {
 178                         /*
 179                          * check whether it may have the same address
 180                          */
 181                         if (!identical_mac_addr_allowed(sdata->vif.type,
 182                                                         nsdata->vif.type))
 183                                 return -ENOTUNIQ;
 184
 185                         /*
 186                          * can only add VLANs to enabled APs
 187                          */
 188                         if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN &&
 189                             nsdata->vif.type == IEEE80211_IF_TYPE_AP &&
 190                             netif_running(nsdata->dev))
 191                                 sdata->u.vlan.ap = nsdata;
 192                 }
 193         }
 194
 195         switch (sdata->vif.type) {
 196         case IEEE80211_IF_TYPE_WDS:
 197                 if (is_zero_ether_addr(sdata->u.wds.remote_addr))
 198                         return -ENOLINK;
 199                 break;
 200         case IEEE80211_IF_TYPE_VLAN:
 201                 if (!sdata->u.vlan.ap)
 202                         return -ENOLINK;
 203                 break;
 204         case IEEE80211_IF_TYPE_AP:
 205         case IEEE80211_IF_TYPE_STA:
 206         case IEEE80211_IF_TYPE_MNTR:
 207         case IEEE80211_IF_TYPE_IBSS:
 208                 /* no special treatment */
 209                 break;
 210         case IEEE80211_IF_TYPE_INVALID:
 211                 /* cannot happen */
 212                 WARN_ON(1);
 213                 break;
 214         }
 215
 216         if (local->open_count == 0) {
 217                 res = 0;
 218                 if (local->ops->start)
 219                         res = local->ops->start(local_to_hw(local));
 220                 if (res)
 221                         return res;
 222                 need_hw_reconfig = 1;
 223                 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
 224         }
 225
 226         switch (sdata->vif.type) {
 227         case IEEE80211_IF_TYPE_VLAN:
 228                 list_add(&sdata->u.vlan.list, &sdata->u.vlan.ap->u.ap.vlans);
 229                 /* no need to tell driver */
 230                 break;
 231         case IEEE80211_IF_TYPE_MNTR:
 232                 /* must be before the call to ieee80211_configure_filter */
 233                 local->monitors++;
 234                 if (local->monitors == 1) {
 235                         netif_tx_lock_bh(local->mdev);
 236                         ieee80211_configure_filter(local);
 237                         netif_tx_unlock_bh(local->mdev);
 238
 239                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 240                 }
 241                 break;
 242         case IEEE80211_IF_TYPE_STA:
 243         case IEEE80211_IF_TYPE_IBSS:
 244                 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
 245                 /* fall through */
 246         default:
 247                 conf.vif = &sdata->vif;
 248                 conf.type = sdata->vif.type;
 249                 conf.mac_addr = dev->dev_addr;
 250                 res = local->ops->add_interface(local_to_hw(local), &conf);
 251                 if (res && !local->open_count && local->ops->stop)
 252                         local->ops->stop(local_to_hw(local));
 253                 if (res)
 254                         return res;
 255
 256                 ieee80211_if_config(dev);
 257                 ieee80211_reset_erp_info(dev);
 258                 ieee80211_enable_keys(sdata);
 259
 260                 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
 261                     !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
 262                         netif_carrier_off(dev);
 263                 else
 264                         netif_carrier_on(dev);
 265         }
 266
 267         if (local->open_count == 0) {
 268                 res = dev_open(local->mdev);
 269                 WARN_ON(res);
 270                 tasklet_enable(&local->tx_pending_tasklet);
 271                 tasklet_enable(&local->tasklet);
 272         }
 273
 274         /*
 275          * set_multicast_list will be invoked by the networking core
 276          * which will check whether any increments here were done in
 277          * error and sync them down to the hardware as filter flags.
 278          */
 279         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 280                 atomic_inc(&local->iff_allmultis);
 281
 282         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 283                 atomic_inc(&local->iff_promiscs);
 284
 285         local->open_count++;
 286         if (need_hw_reconfig)
 287                 ieee80211_hw_config(local);
 288
 289         /*
 290          * ieee80211_sta_work is disabled while network interface
 291          * is down. Therefore, some configuration changes may not
 292          * yet be effective. Trigger execution of ieee80211_sta_work
 293          * to fix this.
 294          */
 295         if(sdata->vif.type == IEEE80211_IF_TYPE_STA ||
 296            sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
 297                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 298                 queue_work(local->hw.workqueue, &ifsta->work);
 299         }
 300
 301         netif_start_queue(dev);
 302
 303         return 0;
 304 }
 305
 306 static int ieee80211_stop(struct net_device *dev)
 307 {
 308         struct ieee80211_sub_if_data *sdata;
 309         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 310         struct ieee80211_if_init_conf conf;
 311         struct sta_info *sta;
 312         int i;
 313
 314         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 315
 316         list_for_each_entry(sta, &local->sta_list, list) {
 317                 if (sta->dev == dev)
 318                         for (i = 0; i <  STA_TID_NUM; i++)
 319                                 ieee80211_sta_stop_rx_ba_session(sta->dev,
 320                                                 sta->addr, i,
 321                                                 WLAN_BACK_RECIPIENT,
 322                                                 WLAN_REASON_QSTA_LEAVE_QBSS);
 323         }
 324
 325         netif_stop_queue(dev);
 326
 327         /*
 328          * Don't count this interface for promisc/allmulti while it
 329          * is down. dev_mc_unsync() will invoke set_multicast_list
 330          * on the master interface which will sync these down to the
 331          * hardware as filter flags.
 332          */
 333         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 334                 atomic_dec(&local->iff_allmultis);
 335
 336         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 337                 atomic_dec(&local->iff_promiscs);
 338
 339         dev_mc_unsync(local->mdev, dev);
 340
 341         /* APs need special treatment */
 342         if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
 343                 struct ieee80211_sub_if_data *vlan, *tmp;
 344                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 345
 346                 /* remove beacon */
 347                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 348                 synchronize_rcu();
 349                 kfree(old_beacon);
 350
 351                 /* down all dependent devices, that is VLANs */
 352                 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
 353                                          u.vlan.list)
 354                         dev_close(vlan->dev);
 355                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 356         }
 357
 358         local->open_count--;
 359
 360         switch (sdata->vif.type) {
 361         case IEEE80211_IF_TYPE_VLAN:
 362                 list_del(&sdata->u.vlan.list);
 363                 sdata->u.vlan.ap = NULL;
 364                 /* no need to tell driver */
 365                 break;
 366         case IEEE80211_IF_TYPE_MNTR:
 367                 local->monitors--;
 368                 if (local->monitors == 0) {
 369                         netif_tx_lock_bh(local->mdev);
 370                         ieee80211_configure_filter(local);
 371                         netif_tx_unlock_bh(local->mdev);
 372
 373                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
 374                 }
 375                 break;
 376         case IEEE80211_IF_TYPE_STA:
 377         case IEEE80211_IF_TYPE_IBSS:
 378                 sdata->u.sta.state = IEEE80211_DISABLED;
 379                 del_timer_sync(&sdata->u.sta.timer);
 380                 /*
 381                  * When we get here, the interface is marked down.
 382                  * Call synchronize_rcu() to wait for the RX path
 383                  * should it be using the interface and enqueuing
 384                  * frames at this very time on another CPU.
 385                  */
 386                 synchronize_rcu();
 387                 skb_queue_purge(&sdata->u.sta.skb_queue);
 388
 389                 if (local->scan_dev == sdata->dev) {
 390                         if (!local->ops->hw_scan) {
 391                                 local->sta_sw_scanning = 0;
 392                                 cancel_delayed_work(&local->scan_work);
 393                         } else
 394                                 local->sta_hw_scanning = 0;
 395                 }
 396
 397                 flush_workqueue(local->hw.workqueue);
 398
 399                 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
 400                 kfree(sdata->u.sta.extra_ie);
 401                 sdata->u.sta.extra_ie = NULL;
 402                 sdata->u.sta.extra_ie_len = 0;
 403                 /* fall through */
 404         default:
 405                 conf.vif = &sdata->vif;
 406                 conf.type = sdata->vif.type;
 407                 conf.mac_addr = dev->dev_addr;
 408                 /* disable all keys for as long as this netdev is down */
 409                 ieee80211_disable_keys(sdata);
 410                 local->ops->remove_interface(local_to_hw(local), &conf);
 411         }
 412
 413         if (local->open_count == 0) {
 414                 if (netif_running(local->mdev))
 415                         dev_close(local->mdev);
 416
 417                 if (local->ops->stop)
 418                         local->ops->stop(local_to_hw(local));
 419
 420                 ieee80211_led_radio(local, 0);
 421
 422                 tasklet_disable(&local->tx_pending_tasklet);
 423                 tasklet_disable(&local->tasklet);
 424         }
 425
 426         return 0;
 427 }
 428
 429 static void ieee80211_set_multicast_list(struct net_device *dev)
 430 {
 431         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 432         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 433         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 434
 435         allmulti = !!(dev->flags & IFF_ALLMULTI);
 436         promisc = !!(dev->flags & IFF_PROMISC);
 437         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 438         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 439
 440         if (allmulti != sdata_allmulti) {
 441                 if (dev->flags & IFF_ALLMULTI)
 442                         atomic_inc(&local->iff_allmultis);
 443                 else
 444                         atomic_dec(&local->iff_allmultis);
 445                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 446         }
 447
 448         if (promisc != sdata_promisc) {
 449                 if (dev->flags & IFF_PROMISC)
 450                         atomic_inc(&local->iff_promiscs);
 451                 else
 452                         atomic_dec(&local->iff_promiscs);
 453                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 454         }
 455
 456         dev_mc_sync(local->mdev, dev);
 457 }
 458
 459 static const struct header_ops ieee80211_header_ops = {
 460         .create         = eth_header,
 461         .parse          = header_parse_80211,
 462         .rebuild        = eth_rebuild_header,
 463         .cache          = eth_header_cache,
 464         .cache_update   = eth_header_cache_update,
 465 };
 466
 467 /* Must not be called for mdev */
 468 void ieee80211_if_setup(struct net_device *dev)
 469 {
 470         ether_setup(dev);
 471         dev->hard_start_xmit = ieee80211_subif_start_xmit;
 472         dev->wireless_handlers = &ieee80211_iw_handler_def;
 473         dev->set_multicast_list = ieee80211_set_multicast_list;
 474         dev->change_mtu = ieee80211_change_mtu;
 475         dev->open = ieee80211_open;
 476         dev->stop = ieee80211_stop;
 477         dev->destructor = ieee80211_if_free;
 478 }
 479
 480 /* WDS specialties */
 481
 482 int ieee80211_if_update_wds(struct net_device *dev, u8 *remote_addr)
 483 {
 484         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 485         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 486         struct sta_info *sta;
 487         DECLARE_MAC_BUF(mac);
 488
 489         if (compare_ether_addr(remote_addr, sdata->u.wds.remote_addr) == 0)
 490                 return 0;
 491
 492         /* Create STA entry for the new peer */
 493         sta = sta_info_add(local, dev, remote_addr, GFP_KERNEL);
 494         if (!sta)
 495                 return -ENOMEM;
 496         sta_info_put(sta);
 497
 498         /* Remove STA entry for the old peer */
 499         sta = sta_info_get(local, sdata->u.wds.remote_addr);
 500         if (sta) {
 501                 sta_info_free(sta);
 502                 sta_info_put(sta);
 503         } else {
 504                 printk(KERN_DEBUG "%s: could not find STA entry for WDS link "
 505                        "peer %s\n",
 506                        dev->name, print_mac(mac, sdata->u.wds.remote_addr));
 507         }
 508
 509         /* Update WDS link data */
 510         memcpy(&sdata->u.wds.remote_addr, remote_addr, ETH_ALEN);
 511
 512         return 0;
 513 }
 514
 515 /* everything else */
 516
 517 static int __ieee80211_if_config(struct net_device *dev,
 518                                  struct sk_buff *beacon,
 519                                  struct ieee80211_tx_control *control)
 520 {
 521         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 522         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 523         struct ieee80211_if_conf conf;
 524
 525         if (!local->ops->config_interface || !netif_running(dev))
 526                 return 0;
 527
 528         memset(&conf, 0, sizeof(conf));
 529         conf.type = sdata->vif.type;
 530         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
 531             sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
 532                 conf.bssid = sdata->u.sta.bssid;
 533                 conf.ssid = sdata->u.sta.ssid;
 534                 conf.ssid_len = sdata->u.sta.ssid_len;
 535         } else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
 536                 conf.ssid = sdata->u.ap.ssid;
 537                 conf.ssid_len = sdata->u.ap.ssid_len;
 538                 conf.beacon = beacon;
 539                 conf.beacon_control = control;
 540         }
 541         return local->ops->config_interface(local_to_hw(local),
 542                                             &sdata->vif, &conf);
 543 }
 544
 545 int ieee80211_if_config(struct net_device *dev)
 546 {
 547         return __ieee80211_if_config(dev, NULL, NULL);
 548 }
 549
 550 int ieee80211_if_config_beacon(struct net_device *dev)
 551 {
 552         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 553         struct ieee80211_tx_control control;
 554         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 555         struct sk_buff *skb;
 556
 557         if (!(local->hw.flags & IEEE80211_HW_HOST_GEN_BEACON_TEMPLATE))
 558                 return 0;
 559         skb = ieee80211_beacon_get(local_to_hw(local), &sdata->vif,
 560                                    &control);
 561         if (!skb)
 562                 return -ENOMEM;
 563         return __ieee80211_if_config(dev, skb, &control);
 564 }
 565
 566 int ieee80211_hw_config(struct ieee80211_local *local)
 567 {
 568         struct ieee80211_hw_mode *mode;
 569         struct ieee80211_channel *chan;
 570         int ret = 0;
 571
 572         if (local->sta_sw_scanning) {
 573                 chan = local->scan_channel;
 574                 mode = local->scan_hw_mode;
 575         } else {
 576                 chan = local->oper_channel;
 577                 mode = local->oper_hw_mode;
 578         }
 579
 580         local->hw.conf.channel = chan->chan;
 581         local->hw.conf.channel_val = chan->val;
 582         if (!local->hw.conf.power_level) {
 583                 local->hw.conf.power_level = chan->power_level;
 584         } else {
 585                 local->hw.conf.power_level = min(chan->power_level,
 586                                                  local->hw.conf.power_level);
 587         }
 588         local->hw.conf.freq = chan->freq;
 589         local->hw.conf.phymode = mode->mode;
 590         local->hw.conf.antenna_max = chan->antenna_max;
 591         local->hw.conf.chan = chan;
 592         local->hw.conf.mode = mode;
 593
 594 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 595         printk(KERN_DEBUG "HW CONFIG: channel=%d freq=%d "
 596                "phymode=%d\n", local->hw.conf.channel, local->hw.conf.freq,
 597                local->hw.conf.phymode);
 598 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 599
 600         if (local->open_count)
 601                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
 602
 603         return ret;
 604 }
 605
 606 /**
 607  * ieee80211_hw_config_ht should be used only after legacy configuration
 608  * has been determined, as ht configuration depends upon the hardware's
 609  * HT abilities for a _specific_ band.
 610  */
 611 int ieee80211_hw_config_ht(struct ieee80211_local *local, int enable_ht,
 612                            struct ieee80211_ht_info *req_ht_cap,
 613                            struct ieee80211_ht_bss_info *req_bss_cap)
 614 {
 615         struct ieee80211_conf *conf = &local->hw.conf;
 616         struct ieee80211_hw_mode *mode = conf->mode;
 617         int i;
 618
 619         /* HT is not supported */
 620         if (!mode->ht_info.ht_supported) {
 621                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
 622                 return -EOPNOTSUPP;
 623         }
 624
 625         /* disable HT */
 626         if (!enable_ht) {
 627                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
 628         } else {
 629                 conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
 630                 conf->ht_conf.cap = req_ht_cap->cap & mode->ht_info.cap;
 631                 conf->ht_conf.cap &= ~(IEEE80211_HT_CAP_MIMO_PS);
 632                 conf->ht_conf.cap |=
 633                         mode->ht_info.cap & IEEE80211_HT_CAP_MIMO_PS;
 634                 conf->ht_bss_conf.primary_channel =
 635                         req_bss_cap->primary_channel;
 636                 conf->ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
 637                 conf->ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
 638                 for (i = 0; i < SUPP_MCS_SET_LEN; i++)
 639                         conf->ht_conf.supp_mcs_set[i] =
 640                                 mode->ht_info.supp_mcs_set[i] &
 641                                   req_ht_cap->supp_mcs_set[i];
 642
 643                 /* In STA mode, this gives us indication
 644                  * to the AP's mode of operation */
 645                 conf->ht_conf.ht_supported = 1;
 646                 conf->ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
 647                 conf->ht_conf.ampdu_density = req_ht_cap->ampdu_density;
 648         }
 649
 650         local->ops->conf_ht(local_to_hw(local), &local->hw.conf);
 651
 652         return 0;
 653 }
 654
 655 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 656                                       u32 changed)
 657 {
 658         struct ieee80211_local *local = sdata->local;
 659
 660         if (!changed)
 661                 return;
 662
 663         if (local->ops->bss_info_changed)
 664                 local->ops->bss_info_changed(local_to_hw(local),
 665                                              &sdata->vif,
 666                                              &sdata->bss_conf,
 667                                              changed);
 668 }
 669
 670 void ieee80211_reset_erp_info(struct net_device *dev)
 671 {
 672         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 673
 674         sdata->bss_conf.use_cts_prot = 0;
 675         sdata->bss_conf.use_short_preamble = 0;
 676         ieee80211_bss_info_change_notify(sdata,
 677                                          BSS_CHANGED_ERP_CTS_PROT |
 678                                          BSS_CHANGED_ERP_PREAMBLE);
 679 }
 680
 681 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 682                                  struct sk_buff *skb,
 683                                  struct ieee80211_tx_status *status)
 684 {
 685         struct ieee80211_local *local = hw_to_local(hw);
 686         struct ieee80211_tx_status *saved;
 687         int tmp;
 688
 689         skb->dev = local->mdev;
 690         saved = kmalloc(sizeof(struct ieee80211_tx_status), GFP_ATOMIC);
 691         if (unlikely(!saved)) {
 692                 if (net_ratelimit())
 693                         printk(KERN_WARNING "%s: Not enough memory, "
 694                                "dropping tx status", skb->dev->name);
 695                 /* should be dev_kfree_skb_irq, but due to this function being
 696                  * named _irqsafe instead of just _irq we can't be sure that
 697                  * people won't call it from non-irq contexts */
 698                 dev_kfree_skb_any(skb);
 699                 return;
 700         }
 701         memcpy(saved, status, sizeof(struct ieee80211_tx_status));
 702         /* copy pointer to saved status into skb->cb for use by tasklet */
 703         memcpy(skb->cb, &saved, sizeof(saved));
 704
 705         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 706         skb_queue_tail(status->control.flags & IEEE80211_TXCTL_REQ_TX_STATUS ?
 707                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 708         tmp = skb_queue_len(&local->skb_queue) +
 709                 skb_queue_len(&local->skb_queue_unreliable);
 710         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 711                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 712                 memcpy(&saved, skb->cb, sizeof(saved));
 713                 kfree(saved);
 714                 dev_kfree_skb_irq(skb);
 715                 tmp--;
 716                 I802_DEBUG_INC(local->tx_status_drop);
 717         }
 718         tasklet_schedule(&local->tasklet);
 719 }
 720 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 721
 722 static void ieee80211_tasklet_handler(unsigned long data)
 723 {
 724         struct ieee80211_local *local = (struct ieee80211_local *) data;
 725         struct sk_buff *skb;
 726         struct ieee80211_rx_status rx_status;
 727         struct ieee80211_tx_status *tx_status;
 728
 729         while ((skb = skb_dequeue(&local->skb_queue)) ||
 730                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 731                 switch (skb->pkt_type) {
 732                 case IEEE80211_RX_MSG:
 733                         /* status is in skb->cb */
 734                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 735                         /* Clear skb->pkt_type in order to not confuse kernel
 736                          * netstack. */
 737                         skb->pkt_type = 0;
 738                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 739                         break;
 740                 case IEEE80211_TX_STATUS_MSG:
 741                         /* get pointer to saved status out of skb->cb */
 742                         memcpy(&tx_status, skb->cb, sizeof(tx_status));
 743                         skb->pkt_type = 0;
 744                         ieee80211_tx_status(local_to_hw(local),
 745                                             skb, tx_status);
 746                         kfree(tx_status);
 747                         break;
 748                 default: /* should never get here! */
 749                         printk(KERN_ERR "%s: Unknown message type (%d)\n",
 750                                wiphy_name(local->hw.wiphy), skb->pkt_type);
 751                         dev_kfree_skb(skb);
 752                         break;
 753                 }
 754         }
 755 }
 756
 757 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 758  * make a prepared TX frame (one that has been given to hw) to look like brand
 759  * new IEEE 802.11 frame that is ready to go through TX processing again.
 760  * Also, tx_packet_data in cb is restored from tx_control. */
 761 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 762                                       struct ieee80211_key *key,
 763                                       struct sk_buff *skb,
 764                                       struct ieee80211_tx_control *control)
 765 {
 766         int hdrlen, iv_len, mic_len;
 767         struct ieee80211_tx_packet_data *pkt_data;
 768
 769         pkt_data = (struct ieee80211_tx_packet_data *)skb->cb;
 770         pkt_data->ifindex = vif_to_sdata(control->vif)->dev->ifindex;
 771         pkt_data->flags = 0;
 772         if (control->flags & IEEE80211_TXCTL_REQ_TX_STATUS)
 773                 pkt_data->flags |= IEEE80211_TXPD_REQ_TX_STATUS;
 774         if (control->flags & IEEE80211_TXCTL_DO_NOT_ENCRYPT)
 775                 pkt_data->flags |= IEEE80211_TXPD_DO_NOT_ENCRYPT;
 776         if (control->flags & IEEE80211_TXCTL_REQUEUE)
 777                 pkt_data->flags |= IEEE80211_TXPD_REQUEUE;
 778         if (control->flags & IEEE80211_TXCTL_EAPOL_FRAME)
 779                 pkt_data->flags |= IEEE80211_TXPD_EAPOL_FRAME;
 780         pkt_data->queue = control->queue;
 781
 782         hdrlen = ieee80211_get_hdrlen_from_skb(skb);
 783
 784         if (!key)
 785                 goto no_key;
 786
 787         switch (key->conf.alg) {
 788         case ALG_WEP:
 789                 iv_len = WEP_IV_LEN;
 790                 mic_len = WEP_ICV_LEN;
 791                 break;
 792         case ALG_TKIP:
 793                 iv_len = TKIP_IV_LEN;
 794                 mic_len = TKIP_ICV_LEN;
 795                 break;
 796         case ALG_CCMP:
 797                 iv_len = CCMP_HDR_LEN;
 798                 mic_len = CCMP_MIC_LEN;
 799                 break;
 800         default:
 801                 goto no_key;
 802         }
 803
 804         if (skb->len >= mic_len &&
 805             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 806                 skb_trim(skb, skb->len - mic_len);
 807         if (skb->len >= iv_len && skb->len > hdrlen) {
 808                 memmove(skb->data + iv_len, skb->data, hdrlen);
 809                 skb_pull(skb, iv_len);
 810         }
 811
 812 no_key:
 813         {
 814                 struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 815                 u16 fc = le16_to_cpu(hdr->frame_control);
 816                 if ((fc & 0x8C) == 0x88) /* QoS Control Field */ {
 817                         fc &= ~IEEE80211_STYPE_QOS_DATA;
 818                         hdr->frame_control = cpu_to_le16(fc);
 819                         memmove(skb->data + 2, skb->data, hdrlen - 2);
 820                         skb_pull(skb, 2);
 821                 }
 822         }
 823 }
 824
 825 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb,
 826                          struct ieee80211_tx_status *status)
 827 {
 828         struct sk_buff *skb2;
 829         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
 830         struct ieee80211_local *local = hw_to_local(hw);
 831         u16 frag, type;
 832         struct ieee80211_tx_status_rtap_hdr *rthdr;
 833         struct ieee80211_sub_if_data *sdata;
 834         int monitors;
 835
 836         if (!status) {
 837                 printk(KERN_ERR
 838                        "%s: ieee80211_tx_status called with NULL status\n",
 839                        wiphy_name(local->hw.wiphy));
 840                 dev_kfree_skb(skb);
 841                 return;
 842         }
 843
 844         if (status->excessive_retries) {
 845                 struct sta_info *sta;
 846                 sta = sta_info_get(local, hdr->addr1);
 847                 if (sta) {
 848                         if (sta->flags & WLAN_STA_PS) {
 849                                 /* The STA is in power save mode, so assume
 850                                  * that this TX packet failed because of that.
 851                                  */
 852                                 status->excessive_retries = 0;
 853                                 status->flags |= IEEE80211_TX_STATUS_TX_FILTERED;
 854                         }
 855                         sta_info_put(sta);
 856                 }
 857         }
 858
 859         if (status->flags & IEEE80211_TX_STATUS_TX_FILTERED) {
 860                 struct sta_info *sta;
 861                 sta = sta_info_get(local, hdr->addr1);
 862                 if (sta) {
 863                         sta->tx_filtered_count++;
 864
 865                         /* Clear the TX filter mask for this STA when sending
 866                          * the next packet. If the STA went to power save mode,
 867                          * this will happen when it is waking up for the next
 868                          * time. */
 869                         sta->clear_dst_mask = 1;
 870
 871                         /* TODO: Is the WLAN_STA_PS flag always set here or is
 872                          * the race between RX and TX status causing some
 873                          * packets to be filtered out before 80211.o gets an
 874                          * update for PS status? This seems to be the case, so
 875                          * no changes are likely to be needed. */
 876                         if (sta->flags & WLAN_STA_PS &&
 877                             skb_queue_len(&sta->tx_filtered) <
 878                             STA_MAX_TX_BUFFER) {
 879                                 ieee80211_remove_tx_extra(local, sta->key,
 880                                                           skb,
 881                                                           &status->control);
 882                                 skb_queue_tail(&sta->tx_filtered, skb);
 883                         } else if (!(sta->flags & WLAN_STA_PS) &&
 884                                    !(status->control.flags & IEEE80211_TXCTL_REQUEUE)) {
 885                                 /* Software retry the packet once */
 886                                 status->control.flags |= IEEE80211_TXCTL_REQUEUE;
 887                                 ieee80211_remove_tx_extra(local, sta->key,
 888                                                           skb,
 889                                                           &status->control);
 890                                 dev_queue_xmit(skb);
 891                         } else {
 892                                 if (net_ratelimit()) {
 893                                         printk(KERN_DEBUG "%s: dropped TX "
 894                                                "filtered frame queue_len=%d "
 895                                                "PS=%d @%lu\n",
 896                                                wiphy_name(local->hw.wiphy),
 897                                                skb_queue_len(
 898                                                        &sta->tx_filtered),
 899                                                !!(sta->flags & WLAN_STA_PS),
 900                                                jiffies);
 901                                 }
 902                                 dev_kfree_skb(skb);
 903                         }
 904                         sta_info_put(sta);
 905                         return;
 906                 }
 907         } else
 908                 rate_control_tx_status(local->mdev, skb, status);
 909
 910         ieee80211_led_tx(local, 0);
 911
 912         /* SNMP counters
 913          * Fragments are passed to low-level drivers as separate skbs, so these
 914          * are actually fragments, not frames. Update frame counters only for
 915          * the first fragment of the frame. */
 916
 917         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
 918         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
 919
 920         if (status->flags & IEEE80211_TX_STATUS_ACK) {
 921                 if (frag == 0) {
 922                         local->dot11TransmittedFrameCount++;
 923                         if (is_multicast_ether_addr(hdr->addr1))
 924                                 local->dot11MulticastTransmittedFrameCount++;
 925                         if (status->retry_count > 0)
 926                                 local->dot11RetryCount++;
 927                         if (status->retry_count > 1)
 928                                 local->dot11MultipleRetryCount++;
 929                 }
 930
 931                 /* This counter shall be incremented for an acknowledged MPDU
 932                  * with an individual address in the address 1 field or an MPDU
 933                  * with a multicast address in the address 1 field of type Data
 934                  * or Management. */
 935                 if (!is_multicast_ether_addr(hdr->addr1) ||
 936                     type == IEEE80211_FTYPE_DATA ||
 937                     type == IEEE80211_FTYPE_MGMT)
 938                         local->dot11TransmittedFragmentCount++;
 939         } else {
 940                 if (frag == 0)
 941                         local->dot11FailedCount++;
 942         }
 943
 944         /* this was a transmitted frame, but now we want to reuse it */
 945         skb_orphan(skb);
 946
 947         if (!local->monitors) {
 948                 dev_kfree_skb(skb);
 949                 return;
 950         }
 951
 952         /* send frame to monitor interfaces now */
 953
 954         if (skb_headroom(skb) < sizeof(*rthdr)) {
 955                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
 956                 dev_kfree_skb(skb);
 957                 return;
 958         }
 959
 960         rthdr = (struct ieee80211_tx_status_rtap_hdr*)
 961                                 skb_push(skb, sizeof(*rthdr));
 962
 963         memset(rthdr, 0, sizeof(*rthdr));
 964         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
 965         rthdr->hdr.it_present =
 966                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
 967                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
 968
 969         if (!(status->flags & IEEE80211_TX_STATUS_ACK) &&
 970             !is_multicast_ether_addr(hdr->addr1))
 971                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
 972
 973         if ((status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS) &&
 974             (status->control.flags & IEEE80211_TXCTL_USE_CTS_PROTECT))
 975                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
 976         else if (status->control.flags & IEEE80211_TXCTL_USE_RTS_CTS)
 977                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
 978
 979         rthdr->data_retries = status->retry_count;
 980
 981         rcu_read_lock();
 982         monitors = local->monitors;
 983         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
 984                 /*
 985                  * Using the monitors counter is possibly racy, but
 986                  * if the value is wrong we simply either clone the skb
 987                  * once too much or forget sending it to one monitor iface
 988                  * The latter case isn't nice but fixing the race is much
 989                  * more complicated.
 990                  */
 991                 if (!monitors || !skb)
 992                         goto out;
 993
 994                 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) {
 995                         if (!netif_running(sdata->dev))
 996                                 continue;
 997                         monitors--;
 998                         if (monitors)
 999                                 skb2 = skb_clone(skb, GFP_ATOMIC);
1000                         else
1001                                 skb2 = NULL;
1002                         skb->dev = sdata->dev;
1003                         /* XXX: is this sufficient for BPF? */
1004                         skb_set_mac_header(skb, 0);
1005                         skb->ip_summed = CHECKSUM_UNNECESSARY;
1006                         skb->pkt_type = PACKET_OTHERHOST;
1007                         skb->protocol = htons(ETH_P_802_2);
1008                         memset(skb->cb, 0, sizeof(skb->cb));
1009                         netif_rx(skb);
1010                         skb = skb2;
1011                 }
1012         }
1013  out:
1014         rcu_read_unlock();
1015         if (skb)
1016                 dev_kfree_skb(skb);
1017 }
1018 EXPORT_SYMBOL(ieee80211_tx_status);
1019
1020 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1021                                         const struct ieee80211_ops *ops)
1022 {
1023         struct net_device *mdev;
1024         struct ieee80211_local *local;
1025         struct ieee80211_sub_if_data *sdata;
1026         int priv_size;
1027         struct wiphy *wiphy;
1028
1029         /* Ensure 32-byte alignment of our private data and hw private data.
1030          * We use the wiphy priv data for both our ieee80211_local and for
1031          * the driver's private data
1032          *
1033          * In memory it'll be like this:
1034          *
1035          * +-------------------------+
1036          * | struct wiphy           |
1037          * +-------------------------+
1038          * | struct ieee80211_local  |
1039          * +-------------------------+
1040          * | driver's private data   |
1041          * +-------------------------+
1042          *
1043          */
1044         priv_size = ((sizeof(struct ieee80211_local) +
1045                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
1046                     priv_data_len;
1047
1048         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
1049
1050         if (!wiphy)
1051                 return NULL;
1052
1053         wiphy->privid = mac80211_wiphy_privid;
1054
1055         local = wiphy_priv(wiphy);
1056         local->hw.wiphy = wiphy;
1057
1058         local->hw.priv = (char *)local +
1059                          ((sizeof(struct ieee80211_local) +
1060                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
1061
1062         BUG_ON(!ops->tx);
1063         BUG_ON(!ops->start);
1064         BUG_ON(!ops->stop);
1065         BUG_ON(!ops->config);
1066         BUG_ON(!ops->add_interface);
1067         BUG_ON(!ops->remove_interface);
1068         BUG_ON(!ops->configure_filter);
1069         local->ops = ops;
1070
1071         /* for now, mdev needs sub_if_data :/ */
1072         mdev = alloc_netdev(sizeof(struct ieee80211_sub_if_data),
1073                             "wmaster%d", ether_setup);
1074         if (!mdev) {
1075                 wiphy_free(wiphy);
1076                 return NULL;
1077         }
1078
1079         sdata = IEEE80211_DEV_TO_SUB_IF(mdev);
1080         mdev->ieee80211_ptr = &sdata->wdev;
1081         sdata->wdev.wiphy = wiphy;
1082
1083         local->hw.queues = 1; /* default */
1084
1085         local->mdev = mdev;
1086         local->rx_pre_handlers = ieee80211_rx_pre_handlers;
1087         local->rx_handlers = ieee80211_rx_handlers;
1088         local->tx_handlers = ieee80211_tx_handlers;
1089
1090         local->bridge_packets = 1;
1091
1092         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
1093         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1094         local->short_retry_limit = 7;
1095         local->long_retry_limit = 4;
1096         local->hw.conf.radio_enabled = 1;
1097
1098         local->enabled_modes = ~0;
1099
1100         INIT_LIST_HEAD(&local->modes_list);
1101
1102         INIT_LIST_HEAD(&local->interfaces);
1103
1104         INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1105         ieee80211_rx_bss_list_init(mdev);
1106
1107         sta_info_init(local);
1108
1109         mdev->hard_start_xmit = ieee80211_master_start_xmit;
1110         mdev->open = ieee80211_master_open;
1111         mdev->stop = ieee80211_master_stop;
1112         mdev->type = ARPHRD_IEEE80211;
1113         mdev->header_ops = &ieee80211_header_ops;
1114         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
1115
1116         sdata->vif.type = IEEE80211_IF_TYPE_AP;
1117         sdata->dev = mdev;
1118         sdata->local = local;
1119         sdata->u.ap.force_unicast_rateidx = -1;
1120         sdata->u.ap.max_ratectrl_rateidx = -1;
1121         ieee80211_if_sdata_init(sdata);
1122         /* no RCU needed since we're still during init phase */
1123         list_add_tail(&sdata->list, &local->interfaces);
1124
1125         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1126                      (unsigned long)local);
1127         tasklet_disable(&local->tx_pending_tasklet);
1128
1129         tasklet_init(&local->tasklet,
1130                      ieee80211_tasklet_handler,
1131                      (unsigned long) local);
1132         tasklet_disable(&local->tasklet);
1133
1134         skb_queue_head_init(&local->skb_queue);
1135         skb_queue_head_init(&local->skb_queue_unreliable);
1136
1137         return local_to_hw(local);
1138 }
1139 EXPORT_SYMBOL(ieee80211_alloc_hw);
1140
1141 int ieee80211_register_hw(struct ieee80211_hw *hw)
1142 {
1143         struct ieee80211_local *local = hw_to_local(hw);
1144         const char *name;
1145         int result;
1146
1147         result = wiphy_register(local->hw.wiphy);
1148         if (result < 0)
1149                 return result;
1150
1151         name = wiphy_dev(local->hw.wiphy)->driver->name;
1152         local->hw.workqueue = create_singlethread_workqueue(name);
1153         if (!local->hw.workqueue) {
1154                 result = -ENOMEM;
1155                 goto fail_workqueue;
1156         }
1157
1158         /*
1159          * The hardware needs headroom for sending the frame,
1160          * and we need some headroom for passing the frame to monitor
1161          * interfaces, but never both at the same time.
1162          */
1163         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1164                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
1165
1166         debugfs_hw_add(local);
1167
1168         local->hw.conf.beacon_int = 1000;
1169
1170         local->wstats_flags |= local->hw.max_rssi ?
1171                                IW_QUAL_LEVEL_UPDATED : IW_QUAL_LEVEL_INVALID;
1172         local->wstats_flags |= local->hw.max_signal ?
1173                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1174         local->wstats_flags |= local->hw.max_noise ?
1175                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1176         if (local->hw.max_rssi < 0 || local->hw.max_noise < 0)
1177                 local->wstats_flags |= IW_QUAL_DBM;
1178
1179         result = sta_info_start(local);
1180         if (result < 0)
1181                 goto fail_sta_info;
1182
1183         rtnl_lock();
1184         result = dev_alloc_name(local->mdev, local->mdev->name);
1185         if (result < 0)
1186                 goto fail_dev;
1187
1188         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1189         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1190
1191         result = register_netdevice(local->mdev);
1192         if (result < 0)
1193                 goto fail_dev;
1194
1195         ieee80211_debugfs_add_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1196         ieee80211_if_set_type(local->mdev, IEEE80211_IF_TYPE_AP);
1197
1198         result = ieee80211_init_rate_ctrl_alg(local,
1199                                               hw->rate_control_algorithm);
1200         if (result < 0) {
1201                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1202                        "algorithm\n", wiphy_name(local->hw.wiphy));
1203                 goto fail_rate;
1204         }
1205
1206         result = ieee80211_wep_init(local);
1207
1208         if (result < 0) {
1209                 printk(KERN_DEBUG "%s: Failed to initialize wep\n",
1210                        wiphy_name(local->hw.wiphy));
1211                 goto fail_wep;
1212         }
1213
1214         ieee80211_install_qdisc(local->mdev);
1215
1216         /* add one default STA interface */
1217         result = ieee80211_if_add(local->mdev, "wlan%d", NULL,
1218                                   IEEE80211_IF_TYPE_STA);
1219         if (result)
1220                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1221                        wiphy_name(local->hw.wiphy));
1222
1223         local->reg_state = IEEE80211_DEV_REGISTERED;
1224         rtnl_unlock();
1225
1226         ieee80211_led_init(local);
1227
1228         return 0;
1229
1230 fail_wep:
1231         rate_control_deinitialize(local);
1232 fail_rate:
1233         ieee80211_debugfs_remove_netdev(IEEE80211_DEV_TO_SUB_IF(local->mdev));
1234         unregister_netdevice(local->mdev);
1235 fail_dev:
1236         rtnl_unlock();
1237         sta_info_stop(local);
1238 fail_sta_info:
1239         debugfs_hw_del(local);
1240         destroy_workqueue(local->hw.workqueue);
1241 fail_workqueue:
1242         wiphy_unregister(local->hw.wiphy);
1243         return result;
1244 }
1245 EXPORT_SYMBOL(ieee80211_register_hw);
1246
1247 int ieee80211_register_hwmode(struct ieee80211_hw *hw,
1248                               struct ieee80211_hw_mode *mode)
1249 {
1250         struct ieee80211_local *local = hw_to_local(hw);
1251         struct ieee80211_rate *rate;
1252         int i;
1253
1254         INIT_LIST_HEAD(&mode->list);
1255         list_add_tail(&mode->list, &local->modes_list);
1256
1257         local->hw_modes |= (1 << mode->mode);
1258         for (i = 0; i < mode->num_rates; i++) {
1259                 rate = &(mode->rates[i]);
1260                 rate->rate_inv = CHAN_UTIL_RATE_LCM / rate->rate;
1261         }
1262         ieee80211_prepare_rates(local, mode);
1263
1264         if (!local->oper_hw_mode) {
1265                 /* Default to this mode */
1266                 local->hw.conf.phymode = mode->mode;
1267                 local->oper_hw_mode = local->scan_hw_mode = mode;
1268                 local->oper_channel = local->scan_channel = &mode->channels[0];
1269                 local->hw.conf.mode = local->oper_hw_mode;
1270                 local->hw.conf.chan = local->oper_channel;
1271         }
1272
1273         if (!(hw->flags & IEEE80211_HW_DEFAULT_REG_DOMAIN_CONFIGURED))
1274                 ieee80211_set_default_regdomain(mode);
1275
1276         return 0;
1277 }
1278 EXPORT_SYMBOL(ieee80211_register_hwmode);
1279
1280 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1281 {
1282         struct ieee80211_local *local = hw_to_local(hw);
1283         struct ieee80211_sub_if_data *sdata, *tmp;
1284         int i;
1285
1286         tasklet_kill(&local->tx_pending_tasklet);
1287         tasklet_kill(&local->tasklet);
1288
1289         rtnl_lock();
1290
1291         BUG_ON(local->reg_state != IEEE80211_DEV_REGISTERED);
1292
1293         local->reg_state = IEEE80211_DEV_UNREGISTERED;
1294
1295         /*
1296          * At this point, interface list manipulations are fine
1297          * because the driver cannot be handing us frames any
1298          * more and the tasklet is killed.
1299          */
1300
1301         /*
1302          * First, we remove all non-master interfaces. Do this because they
1303          * may have bss pointer dependency on the master, and when we free
1304          * the master these would be freed as well, breaking our list
1305          * iteration completely.
1306          */
1307         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1308                 if (sdata->dev == local->mdev)
1309                         continue;
1310                 list_del(&sdata->list);
1311                 __ieee80211_if_del(local, sdata);
1312         }
1313
1314         /* then, finally, remove the master interface */
1315         __ieee80211_if_del(local, IEEE80211_DEV_TO_SUB_IF(local->mdev));
1316
1317         rtnl_unlock();
1318
1319         ieee80211_rx_bss_list_deinit(local->mdev);
1320         ieee80211_clear_tx_pending(local);
1321         sta_info_stop(local);
1322         rate_control_deinitialize(local);
1323         debugfs_hw_del(local);
1324
1325         for (i = 0; i < NUM_IEEE80211_MODES; i++) {
1326                 kfree(local->supp_rates[i]);
1327                 kfree(local->basic_rates[i]);
1328         }
1329
1330         if (skb_queue_len(&local->skb_queue)
1331                         || skb_queue_len(&local->skb_queue_unreliable))
1332                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1333                        wiphy_name(local->hw.wiphy));
1334         skb_queue_purge(&local->skb_queue);
1335         skb_queue_purge(&local->skb_queue_unreliable);
1336
1337         destroy_workqueue(local->hw.workqueue);
1338         wiphy_unregister(local->hw.wiphy);
1339         ieee80211_wep_free(local);
1340         ieee80211_led_exit(local);
1341 }
1342 EXPORT_SYMBOL(ieee80211_unregister_hw);
1343
1344 void ieee80211_free_hw(struct ieee80211_hw *hw)
1345 {
1346         struct ieee80211_local *local = hw_to_local(hw);
1347
1348         ieee80211_if_free(local->mdev);
1349         wiphy_free(local->hw.wiphy);
1350 }
1351 EXPORT_SYMBOL(ieee80211_free_hw);
1352
1353 static int __init ieee80211_init(void)
1354 {
1355         struct sk_buff *skb;
1356         int ret;
1357
1358         BUILD_BUG_ON(sizeof(struct ieee80211_tx_packet_data) > sizeof(skb->cb));
1359
1360         ret = rc80211_simple_init();
1361         if (ret)
1362                 goto out;
1363
1364         ret = rc80211_pid_init();
1365         if (ret)
1366                 goto out_cleanup_simple;
1367
1368         ret = ieee80211_wme_register();
1369         if (ret) {
1370                 printk(KERN_DEBUG "ieee80211_init: failed to "
1371                        "initialize WME (err=%d)\n", ret);
1372                 goto out_cleanup_pid;
1373         }
1374
1375         ieee80211_debugfs_netdev_init();
1376         ieee80211_regdomain_init();
1377
1378         return 0;
1379
1380  out_cleanup_pid:
1381         rc80211_pid_exit();
1382  out_cleanup_simple:
1383         rc80211_simple_exit();
1384  out:
1385         return ret;
1386 }
1387
1388 static void __exit ieee80211_exit(void)
1389 {
1390         rc80211_simple_exit();
1391         rc80211_pid_exit();
1392
1393         ieee80211_wme_unregister();
1394         ieee80211_debugfs_netdev_exit();
1395 }
1396
1397
1398 subsys_initcall(ieee80211_init);
1399 module_exit(ieee80211_exit);
1400
1401 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1402 MODULE_LICENSE("GPL");