net/mac80211/main.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 "rate.h"
  29 #include "mesh.h"
  30 #include "wep.h"
  31 #include "wme.h"
  32 #include "aes_ccm.h"
  33 #include "led.h"
  34 #include "cfg.h"
  35 #include "debugfs.h"
  36 #include "debugfs_netdev.h"
  37
  38 /*
  39  * For seeing transmitted packets on monitor interfaces
  40  * we have a radiotap header too.
  41  */
  42 struct ieee80211_tx_status_rtap_hdr {
  43         struct ieee80211_radiotap_header hdr;
  44         __le16 tx_flags;
  45         u8 data_retries;
  46 } __attribute__ ((packed));
  47
  48 /* common interface routines */
  49
  50 static int header_parse_80211(const struct sk_buff *skb, unsigned char *haddr)
  51 {
  52         memcpy(haddr, skb_mac_header(skb) + 10, ETH_ALEN); /* addr2 */
  53         return ETH_ALEN;
  54 }
  55
  56 /* must be called under mdev tx lock */
  57 static void ieee80211_configure_filter(struct ieee80211_local *local)
  58 {
  59         unsigned int changed_flags;
  60         unsigned int new_flags = 0;
  61
  62         if (atomic_read(&local->iff_promiscs))
  63                 new_flags |= FIF_PROMISC_IN_BSS;
  64
  65         if (atomic_read(&local->iff_allmultis))
  66                 new_flags |= FIF_ALLMULTI;
  67
  68         if (local->monitors)
  69                 new_flags |= FIF_BCN_PRBRESP_PROMISC;
  70
  71         if (local->fif_fcsfail)
  72                 new_flags |= FIF_FCSFAIL;
  73
  74         if (local->fif_plcpfail)
  75                 new_flags |= FIF_PLCPFAIL;
  76
  77         if (local->fif_control)
  78                 new_flags |= FIF_CONTROL;
  79
  80         if (local->fif_other_bss)
  81                 new_flags |= FIF_OTHER_BSS;
  82
  83         changed_flags = local->filter_flags ^ new_flags;
  84
  85         /* be a bit nasty */
  86         new_flags |= (1<<31);
  87
  88         local->ops->configure_filter(local_to_hw(local),
  89                                      changed_flags, &new_flags,
  90                                      local->mdev->mc_count,
  91                                      local->mdev->mc_list);
  92
  93         WARN_ON(new_flags & (1<<31));
  94
  95         local->filter_flags = new_flags & ~(1<<31);
  96 }
  97
  98 /* master interface */
  99
 100 static int ieee80211_master_open(struct net_device *dev)
 101 {
 102         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 103         struct ieee80211_sub_if_data *sdata;
 104         int res = -EOPNOTSUPP;
 105
 106         /* we hold the RTNL here so can safely walk the list */
 107         list_for_each_entry(sdata, &local->interfaces, list) {
 108                 if (netif_running(sdata->dev)) {
 109                         res = 0;
 110                         break;
 111                 }
 112         }
 113
 114         if (res)
 115                 return res;
 116
 117         netif_tx_start_all_queues(local->mdev);
 118
 119         return 0;
 120 }
 121
 122 static int ieee80211_master_stop(struct net_device *dev)
 123 {
 124         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 125         struct ieee80211_sub_if_data *sdata;
 126
 127         /* we hold the RTNL here so can safely walk the list */
 128         list_for_each_entry(sdata, &local->interfaces, list)
 129                 if (netif_running(sdata->dev))
 130                         dev_close(sdata->dev);
 131
 132         return 0;
 133 }
 134
 135 static void ieee80211_master_set_multicast_list(struct net_device *dev)
 136 {
 137         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 138
 139         ieee80211_configure_filter(local);
 140 }
 141
 142 /* regular interfaces */
 143
 144 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 145 {
 146         int meshhdrlen;
 147         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 148
 149         meshhdrlen = (sdata->vif.type == IEEE80211_IF_TYPE_MESH_POINT) ? 5 : 0;
 150
 151         /* FIX: what would be proper limits for MTU?
 152          * This interface uses 802.3 frames. */
 153         if (new_mtu < 256 ||
 154             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
 155                 return -EINVAL;
 156         }
 157
 158 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 159         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
 160 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
 161         dev->mtu = new_mtu;
 162         return 0;
 163 }
 164
 165 static inline int identical_mac_addr_allowed(int type1, int type2)
 166 {
 167         return (type1 == IEEE80211_IF_TYPE_MNTR ||
 168                 type2 == IEEE80211_IF_TYPE_MNTR ||
 169                 (type1 == IEEE80211_IF_TYPE_AP &&
 170                  type2 == IEEE80211_IF_TYPE_WDS) ||
 171                 (type1 == IEEE80211_IF_TYPE_WDS &&
 172                  (type2 == IEEE80211_IF_TYPE_WDS ||
 173                   type2 == IEEE80211_IF_TYPE_AP)) ||
 174                 (type1 == IEEE80211_IF_TYPE_AP &&
 175                  type2 == IEEE80211_IF_TYPE_VLAN) ||
 176                 (type1 == IEEE80211_IF_TYPE_VLAN &&
 177                  (type2 == IEEE80211_IF_TYPE_AP ||
 178                   type2 == IEEE80211_IF_TYPE_VLAN)));
 179 }
 180
 181 static int ieee80211_open(struct net_device *dev)
 182 {
 183         struct ieee80211_sub_if_data *sdata, *nsdata;
 184         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 185         struct sta_info *sta;
 186         struct ieee80211_if_init_conf conf;
 187         u32 changed = 0;
 188         int res;
 189         bool need_hw_reconfig = 0;
 190         u8 null_addr[ETH_ALEN] = {0};
 191
 192         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 193
 194         /* fail early if user set an invalid address */
 195         if (compare_ether_addr(dev->dev_addr, null_addr) &&
 196             !is_valid_ether_addr(dev->dev_addr))
 197                 return -EADDRNOTAVAIL;
 198
 199         /* we hold the RTNL here so can safely walk the list */
 200         list_for_each_entry(nsdata, &local->interfaces, list) {
 201                 struct net_device *ndev = nsdata->dev;
 202
 203                 if (ndev != dev && netif_running(ndev)) {
 204                         /*
 205                          * Allow only a single IBSS interface to be up at any
 206                          * time. This is restricted because beacon distribution
 207                          * cannot work properly if both are in the same IBSS.
 208                          *
 209                          * To remove this restriction we'd have to disallow them
 210                          * from setting the same SSID on different IBSS interfaces
 211                          * belonging to the same hardware. Then, however, we're
 212                          * faced with having to adopt two different TSF timers...
 213                          */
 214                         if (sdata->vif.type == IEEE80211_IF_TYPE_IBSS &&
 215                             nsdata->vif.type == IEEE80211_IF_TYPE_IBSS)
 216                                 return -EBUSY;
 217
 218                         /*
 219                          * The remaining checks are only performed for interfaces
 220                          * with the same MAC address.
 221                          */
 222                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 223                                 continue;
 224
 225                         /*
 226                          * check whether it may have the same address
 227                          */
 228                         if (!identical_mac_addr_allowed(sdata->vif.type,
 229                                                         nsdata->vif.type))
 230                                 return -ENOTUNIQ;
 231
 232                         /*
 233                          * can only add VLANs to enabled APs
 234                          */
 235                         if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN &&
 236                             nsdata->vif.type == IEEE80211_IF_TYPE_AP)
 237                                 sdata->bss = &nsdata->u.ap;
 238                 }
 239         }
 240
 241         switch (sdata->vif.type) {
 242         case IEEE80211_IF_TYPE_WDS:
 243                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 244                         return -ENOLINK;
 245                 break;
 246         case IEEE80211_IF_TYPE_VLAN:
 247                 if (!sdata->bss)
 248                         return -ENOLINK;
 249                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 250                 break;
 251         case IEEE80211_IF_TYPE_AP:
 252                 sdata->bss = &sdata->u.ap;
 253                 break;
 254         case IEEE80211_IF_TYPE_MESH_POINT:
 255                 /* mesh ifaces must set allmulti to forward mcast traffic */
 256                 atomic_inc(&local->iff_allmultis);
 257                 break;
 258         case IEEE80211_IF_TYPE_STA:
 259         case IEEE80211_IF_TYPE_MNTR:
 260         case IEEE80211_IF_TYPE_IBSS:
 261                 /* no special treatment */
 262                 break;
 263         case IEEE80211_IF_TYPE_INVALID:
 264                 /* cannot happen */
 265                 WARN_ON(1);
 266                 break;
 267         }
 268
 269         if (local->open_count == 0) {
 270                 res = 0;
 271                 if (local->ops->start)
 272                         res = local->ops->start(local_to_hw(local));
 273                 if (res)
 274                         goto err_del_bss;
 275                 need_hw_reconfig = 1;
 276                 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
 277         }
 278
 279         /*
 280          * Check all interfaces and copy the hopefully now-present
 281          * MAC address to those that have the special null one.
 282          */
 283         list_for_each_entry(nsdata, &local->interfaces, list) {
 284                 struct net_device *ndev = nsdata->dev;
 285
 286                 /*
 287                  * No need to check netif_running since we do not allow
 288                  * it to start up with this invalid address.
 289                  */
 290                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
 291                         memcpy(ndev->dev_addr,
 292                                local->hw.wiphy->perm_addr,
 293                                ETH_ALEN);
 294         }
 295
 296         if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0)
 297                 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr,
 298                        ETH_ALEN);
 299
 300         /*
 301          * Validate the MAC address for this device.
 302          */
 303         if (!is_valid_ether_addr(dev->dev_addr)) {
 304                 if (!local->open_count && local->ops->stop)
 305                         local->ops->stop(local_to_hw(local));
 306                 return -EADDRNOTAVAIL;
 307         }
 308
 309         switch (sdata->vif.type) {
 310         case IEEE80211_IF_TYPE_VLAN:
 311                 /* no need to tell driver */
 312                 break;
 313         case IEEE80211_IF_TYPE_MNTR:
 314                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 315                         local->cooked_mntrs++;
 316                         break;
 317                 }
 318
 319                 /* must be before the call to ieee80211_configure_filter */
 320                 local->monitors++;
 321                 if (local->monitors == 1)
 322                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 323
 324                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 325                         local->fif_fcsfail++;
 326                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 327                         local->fif_plcpfail++;
 328                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 329                         local->fif_control++;
 330                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 331                         local->fif_other_bss++;
 332
 333                 netif_addr_lock_bh(local->mdev);
 334                 ieee80211_configure_filter(local);
 335                 netif_addr_unlock_bh(local->mdev);
 336                 break;
 337         case IEEE80211_IF_TYPE_STA:
 338         case IEEE80211_IF_TYPE_IBSS:
 339                 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
 340                 /* fall through */
 341         default:
 342                 conf.vif = &sdata->vif;
 343                 conf.type = sdata->vif.type;
 344                 conf.mac_addr = dev->dev_addr;
 345                 res = local->ops->add_interface(local_to_hw(local), &conf);
 346                 if (res)
 347                         goto err_stop;
 348
 349                 if (ieee80211_vif_is_mesh(&sdata->vif))
 350                         ieee80211_start_mesh(sdata);
 351                 changed |= ieee80211_reset_erp_info(sdata);
 352                 ieee80211_bss_info_change_notify(sdata, changed);
 353                 ieee80211_enable_keys(sdata);
 354
 355                 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
 356                     !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
 357                         netif_carrier_off(dev);
 358                 else
 359                         netif_carrier_on(dev);
 360         }
 361
 362         if (sdata->vif.type == IEEE80211_IF_TYPE_WDS) {
 363                 /* Create STA entry for the WDS peer */
 364                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 365                                      GFP_KERNEL);
 366                 if (!sta) {
 367                         res = -ENOMEM;
 368                         goto err_del_interface;
 369                 }
 370
 371                 /* no locking required since STA is not live yet */
 372                 sta->flags |= WLAN_STA_AUTHORIZED;
 373
 374                 res = sta_info_insert(sta);
 375                 if (res) {
 376                         /* STA has been freed */
 377                         goto err_del_interface;
 378                 }
 379         }
 380
 381         if (local->open_count == 0) {
 382                 res = dev_open(local->mdev);
 383                 WARN_ON(res);
 384                 if (res)
 385                         goto err_del_interface;
 386                 tasklet_enable(&local->tx_pending_tasklet);
 387                 tasklet_enable(&local->tasklet);
 388         }
 389
 390         /*
 391          * set_multicast_list will be invoked by the networking core
 392          * which will check whether any increments here were done in
 393          * error and sync them down to the hardware as filter flags.
 394          */
 395         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 396                 atomic_inc(&local->iff_allmultis);
 397
 398         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 399                 atomic_inc(&local->iff_promiscs);
 400
 401         local->open_count++;
 402         if (need_hw_reconfig)
 403                 ieee80211_hw_config(local);
 404
 405         /*
 406          * ieee80211_sta_work is disabled while network interface
 407          * is down. Therefore, some configuration changes may not
 408          * yet be effective. Trigger execution of ieee80211_sta_work
 409          * to fix this.
 410          */
 411         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
 412             sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
 413                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 414                 queue_work(local->hw.workqueue, &ifsta->work);
 415         }
 416
 417         netif_tx_start_all_queues(dev);
 418
 419         return 0;
 420  err_del_interface:
 421         local->ops->remove_interface(local_to_hw(local), &conf);
 422  err_stop:
 423         if (!local->open_count && local->ops->stop)
 424                 local->ops->stop(local_to_hw(local));
 425  err_del_bss:
 426         sdata->bss = NULL;
 427         if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN)
 428                 list_del(&sdata->u.vlan.list);
 429         return res;
 430 }
 431
 432 static int ieee80211_stop(struct net_device *dev)
 433 {
 434         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 435         struct ieee80211_local *local = sdata->local;
 436         struct ieee80211_if_init_conf conf;
 437         struct sta_info *sta;
 438
 439         /*
 440          * Stop TX on this interface first.
 441          */
 442         netif_tx_stop_all_queues(dev);
 443
 444         /*
 445          * Now delete all active aggregation sessions.
 446          */
 447         rcu_read_lock();
 448
 449         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 450                 if (sta->sdata == sdata)
 451                         ieee80211_sta_tear_down_BA_sessions(sdata, sta->addr);
 452         }
 453
 454         rcu_read_unlock();
 455
 456         /*
 457          * Remove all stations associated with this interface.
 458          *
 459          * This must be done before calling ops->remove_interface()
 460          * because otherwise we can later invoke ops->sta_notify()
 461          * whenever the STAs are removed, and that invalidates driver
 462          * assumptions about always getting a vif pointer that is valid
 463          * (because if we remove a STA after ops->remove_interface()
 464          * the driver will have removed the vif info already!)
 465          *
 466          * We could relax this and only unlink the stations from the
 467          * hash table and list but keep them on a per-sdata list that
 468          * will be inserted back again when the interface is brought
 469          * up again, but I don't currently see a use case for that,
 470          * except with WDS which gets a STA entry created when it is
 471          * brought up.
 472          */
 473         sta_info_flush(local, sdata);
 474
 475         /*
 476          * Don't count this interface for promisc/allmulti while it
 477          * is down. dev_mc_unsync() will invoke set_multicast_list
 478          * on the master interface which will sync these down to the
 479          * hardware as filter flags.
 480          */
 481         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 482                 atomic_dec(&local->iff_allmultis);
 483
 484         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 485                 atomic_dec(&local->iff_promiscs);
 486
 487         dev_mc_unsync(local->mdev, dev);
 488
 489         /* APs need special treatment */
 490         if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
 491                 struct ieee80211_sub_if_data *vlan, *tmp;
 492                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 493
 494                 /* remove beacon */
 495                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 496                 synchronize_rcu();
 497                 kfree(old_beacon);
 498
 499                 /* down all dependent devices, that is VLANs */
 500                 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
 501                                          u.vlan.list)
 502                         dev_close(vlan->dev);
 503                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 504         }
 505
 506         local->open_count--;
 507
 508         switch (sdata->vif.type) {
 509         case IEEE80211_IF_TYPE_VLAN:
 510                 list_del(&sdata->u.vlan.list);
 511                 /* no need to tell driver */
 512                 break;
 513         case IEEE80211_IF_TYPE_MNTR:
 514                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 515                         local->cooked_mntrs--;
 516                         break;
 517                 }
 518
 519                 local->monitors--;
 520                 if (local->monitors == 0)
 521                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
 522
 523                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 524                         local->fif_fcsfail--;
 525                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 526                         local->fif_plcpfail--;
 527                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 528                         local->fif_control--;
 529                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 530                         local->fif_other_bss--;
 531
 532                 netif_addr_lock_bh(local->mdev);
 533                 ieee80211_configure_filter(local);
 534                 netif_addr_unlock_bh(local->mdev);
 535                 break;
 536         case IEEE80211_IF_TYPE_MESH_POINT:
 537                 /* allmulti is always set on mesh ifaces */
 538                 atomic_dec(&local->iff_allmultis);
 539                 /* fall through */
 540         case IEEE80211_IF_TYPE_STA:
 541         case IEEE80211_IF_TYPE_IBSS:
 542                 sdata->u.sta.state = IEEE80211_STA_MLME_DISABLED;
 543                 memset(sdata->u.sta.bssid, 0, ETH_ALEN);
 544                 del_timer_sync(&sdata->u.sta.timer);
 545                 /*
 546                  * When we get here, the interface is marked down.
 547                  * Call synchronize_rcu() to wait for the RX path
 548                  * should it be using the interface and enqueuing
 549                  * frames at this very time on another CPU.
 550                  */
 551                 synchronize_rcu();
 552                 skb_queue_purge(&sdata->u.sta.skb_queue);
 553
 554                 if (local->scan_sdata == sdata) {
 555                         if (!local->ops->hw_scan) {
 556                                 local->sta_sw_scanning = 0;
 557                                 cancel_delayed_work(&local->scan_work);
 558                         } else
 559                                 local->sta_hw_scanning = 0;
 560                 }
 561
 562                 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
 563                 kfree(sdata->u.sta.extra_ie);
 564                 sdata->u.sta.extra_ie = NULL;
 565                 sdata->u.sta.extra_ie_len = 0;
 566                 /* fall through */
 567         default:
 568                 conf.vif = &sdata->vif;
 569                 conf.type = sdata->vif.type;
 570                 conf.mac_addr = dev->dev_addr;
 571                 /* disable all keys for as long as this netdev is down */
 572                 ieee80211_disable_keys(sdata);
 573                 local->ops->remove_interface(local_to_hw(local), &conf);
 574         }
 575
 576         sdata->bss = NULL;
 577
 578         if (local->open_count == 0) {
 579                 if (netif_running(local->mdev))
 580                         dev_close(local->mdev);
 581
 582                 if (local->ops->stop)
 583                         local->ops->stop(local_to_hw(local));
 584
 585                 ieee80211_led_radio(local, 0);
 586
 587                 flush_workqueue(local->hw.workqueue);
 588
 589                 tasklet_disable(&local->tx_pending_tasklet);
 590                 tasklet_disable(&local->tasklet);
 591         }
 592
 593         return 0;
 594 }
 595
 596 int ieee80211_start_tx_ba_session(struct ieee80211_hw *hw, u8 *ra, u16 tid)
 597 {
 598         struct ieee80211_local *local = hw_to_local(hw);
 599         struct sta_info *sta;
 600         struct ieee80211_sub_if_data *sdata;
 601         u16 start_seq_num;
 602         u8 *state;
 603         int ret;
 604         DECLARE_MAC_BUF(mac);
 605
 606         if (tid >= STA_TID_NUM)
 607                 return -EINVAL;
 608
 609 #ifdef CONFIG_MAC80211_HT_DEBUG
 610         printk(KERN_DEBUG "Open BA session requested for %s tid %u\n",
 611                                 print_mac(mac, ra), tid);
 612 #endif /* CONFIG_MAC80211_HT_DEBUG */
 613
 614         rcu_read_lock();
 615
 616         sta = sta_info_get(local, ra);
 617         if (!sta) {
 618 #ifdef CONFIG_MAC80211_HT_DEBUG
 619                 printk(KERN_DEBUG "Could not find the station\n");
 620 #endif
 621                 ret = -ENOENT;
 622                 goto exit;
 623         }
 624
 625         spin_lock_bh(&sta->lock);
 626
 627         /* we have tried too many times, receiver does not want A-MPDU */
 628         if (sta->ampdu_mlme.addba_req_num[tid] > HT_AGG_MAX_RETRIES) {
 629                 ret = -EBUSY;
 630                 goto err_unlock_sta;
 631         }
 632
 633         state = &sta->ampdu_mlme.tid_state_tx[tid];
 634         /* check if the TID is not in aggregation flow already */
 635         if (*state != HT_AGG_STATE_IDLE) {
 636 #ifdef CONFIG_MAC80211_HT_DEBUG
 637                 printk(KERN_DEBUG "BA request denied - session is not "
 638                                  "idle on tid %u\n", tid);
 639 #endif /* CONFIG_MAC80211_HT_DEBUG */
 640                 ret = -EAGAIN;
 641                 goto err_unlock_sta;
 642         }
 643
 644         /* prepare A-MPDU MLME for Tx aggregation */
 645         sta->ampdu_mlme.tid_tx[tid] =
 646                         kmalloc(sizeof(struct tid_ampdu_tx), GFP_ATOMIC);
 647         if (!sta->ampdu_mlme.tid_tx[tid]) {
 648 #ifdef CONFIG_MAC80211_HT_DEBUG
 649                 if (net_ratelimit())
 650                         printk(KERN_ERR "allocate tx mlme to tid %d failed\n",
 651                                         tid);
 652 #endif
 653                 ret = -ENOMEM;
 654                 goto err_unlock_sta;
 655         }
 656         /* Tx timer */
 657         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.function =
 658                         sta_addba_resp_timer_expired;
 659         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.data =
 660                         (unsigned long)&sta->timer_to_tid[tid];
 661         init_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
 662
 663         /* create a new queue for this aggregation */
 664         ret = ieee80211_ht_agg_queue_add(local, sta, tid);
 665
 666         /* case no queue is available to aggregation
 667          * don't switch to aggregation */
 668         if (ret) {
 669 #ifdef CONFIG_MAC80211_HT_DEBUG
 670                 printk(KERN_DEBUG "BA request denied - queue unavailable for"
 671                                         " tid %d\n", tid);
 672 #endif /* CONFIG_MAC80211_HT_DEBUG */
 673                 goto err_unlock_queue;
 674         }
 675         sdata = sta->sdata;
 676
 677         /* Ok, the Addba frame hasn't been sent yet, but if the driver calls the
 678          * call back right away, it must see that the flow has begun */
 679         *state |= HT_ADDBA_REQUESTED_MSK;
 680
 681         /* This is slightly racy because the queue isn't stopped */
 682         start_seq_num = sta->tid_seq[tid];
 683
 684         if (local->ops->ampdu_action)
 685                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_START,
 686                                                 ra, tid, &start_seq_num);
 687
 688         if (ret) {
 689                 /* No need to requeue the packets in the agg queue, since we
 690                  * held the tx lock: no packet could be enqueued to the newly
 691                  * allocated queue */
 692                 ieee80211_ht_agg_queue_remove(local, sta, tid, 0);
 693 #ifdef CONFIG_MAC80211_HT_DEBUG
 694                 printk(KERN_DEBUG "BA request denied - HW unavailable for"
 695                                         " tid %d\n", tid);
 696 #endif /* CONFIG_MAC80211_HT_DEBUG */
 697                 *state = HT_AGG_STATE_IDLE;
 698                 goto err_unlock_queue;
 699         }
 700
 701         /* Will put all the packets in the new SW queue */
 702         ieee80211_requeue(local, ieee802_1d_to_ac[tid]);
 703         spin_unlock_bh(&sta->lock);
 704
 705         /* send an addBA request */
 706         sta->ampdu_mlme.dialog_token_allocator++;
 707         sta->ampdu_mlme.tid_tx[tid]->dialog_token =
 708                         sta->ampdu_mlme.dialog_token_allocator;
 709         sta->ampdu_mlme.tid_tx[tid]->ssn = start_seq_num;
 710
 711
 712         ieee80211_send_addba_request(sta->sdata, ra, tid,
 713                          sta->ampdu_mlme.tid_tx[tid]->dialog_token,
 714                          sta->ampdu_mlme.tid_tx[tid]->ssn,
 715                          0x40, 5000);
 716         /* activate the timer for the recipient's addBA response */
 717         sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer.expires =
 718                                 jiffies + ADDBA_RESP_INTERVAL;
 719         add_timer(&sta->ampdu_mlme.tid_tx[tid]->addba_resp_timer);
 720 #ifdef CONFIG_MAC80211_HT_DEBUG
 721         printk(KERN_DEBUG "activated addBA response timer on tid %d\n", tid);
 722 #endif
 723         goto exit;
 724
 725 err_unlock_queue:
 726         kfree(sta->ampdu_mlme.tid_tx[tid]);
 727         sta->ampdu_mlme.tid_tx[tid] = NULL;
 728         ret = -EBUSY;
 729 err_unlock_sta:
 730         spin_unlock_bh(&sta->lock);
 731 exit:
 732         rcu_read_unlock();
 733         return ret;
 734 }
 735 EXPORT_SYMBOL(ieee80211_start_tx_ba_session);
 736
 737 int ieee80211_stop_tx_ba_session(struct ieee80211_hw *hw,
 738                                  u8 *ra, u16 tid,
 739                                  enum ieee80211_back_parties initiator)
 740 {
 741         struct ieee80211_local *local = hw_to_local(hw);
 742         struct sta_info *sta;
 743         u8 *state;
 744         int ret = 0;
 745         DECLARE_MAC_BUF(mac);
 746
 747         if (tid >= STA_TID_NUM)
 748                 return -EINVAL;
 749
 750         rcu_read_lock();
 751         sta = sta_info_get(local, ra);
 752         if (!sta) {
 753                 rcu_read_unlock();
 754                 return -ENOENT;
 755         }
 756
 757         /* check if the TID is in aggregation */
 758         state = &sta->ampdu_mlme.tid_state_tx[tid];
 759         spin_lock_bh(&sta->lock);
 760
 761         if (*state != HT_AGG_STATE_OPERATIONAL) {
 762                 ret = -ENOENT;
 763                 goto stop_BA_exit;
 764         }
 765
 766 #ifdef CONFIG_MAC80211_HT_DEBUG
 767         printk(KERN_DEBUG "Tx BA session stop requested for %s tid %u\n",
 768                                 print_mac(mac, ra), tid);
 769 #endif /* CONFIG_MAC80211_HT_DEBUG */
 770
 771         ieee80211_stop_queue(hw, sta->tid_to_tx_q[tid]);
 772
 773         *state = HT_AGG_STATE_REQ_STOP_BA_MSK |
 774                 (initiator << HT_AGG_STATE_INITIATOR_SHIFT);
 775
 776         if (local->ops->ampdu_action)
 777                 ret = local->ops->ampdu_action(hw, IEEE80211_AMPDU_TX_STOP,
 778                                                 ra, tid, NULL);
 779
 780         /* case HW denied going back to legacy */
 781         if (ret) {
 782                 WARN_ON(ret != -EBUSY);
 783                 *state = HT_AGG_STATE_OPERATIONAL;
 784                 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
 785                 goto stop_BA_exit;
 786         }
 787
 788 stop_BA_exit:
 789         spin_unlock_bh(&sta->lock);
 790         rcu_read_unlock();
 791         return ret;
 792 }
 793 EXPORT_SYMBOL(ieee80211_stop_tx_ba_session);
 794
 795 void ieee80211_start_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u16 tid)
 796 {
 797         struct ieee80211_local *local = hw_to_local(hw);
 798         struct sta_info *sta;
 799         u8 *state;
 800         DECLARE_MAC_BUF(mac);
 801
 802         if (tid >= STA_TID_NUM) {
 803 #ifdef CONFIG_MAC80211_HT_DEBUG
 804                 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
 805                                 tid, STA_TID_NUM);
 806 #endif
 807                 return;
 808         }
 809
 810         rcu_read_lock();
 811         sta = sta_info_get(local, ra);
 812         if (!sta) {
 813                 rcu_read_unlock();
 814 #ifdef CONFIG_MAC80211_HT_DEBUG
 815                 printk(KERN_DEBUG "Could not find station: %s\n",
 816                                 print_mac(mac, ra));
 817 #endif
 818                 return;
 819         }
 820
 821         state = &sta->ampdu_mlme.tid_state_tx[tid];
 822         spin_lock_bh(&sta->lock);
 823
 824         if (!(*state & HT_ADDBA_REQUESTED_MSK)) {
 825 #ifdef CONFIG_MAC80211_HT_DEBUG
 826                 printk(KERN_DEBUG "addBA was not requested yet, state is %d\n",
 827                                 *state);
 828 #endif
 829                 spin_unlock_bh(&sta->lock);
 830                 rcu_read_unlock();
 831                 return;
 832         }
 833
 834         WARN_ON_ONCE(*state & HT_ADDBA_DRV_READY_MSK);
 835
 836         *state |= HT_ADDBA_DRV_READY_MSK;
 837
 838         if (*state == HT_AGG_STATE_OPERATIONAL) {
 839 #ifdef CONFIG_MAC80211_HT_DEBUG
 840                 printk(KERN_DEBUG "Aggregation is on for tid %d \n", tid);
 841 #endif
 842                 ieee80211_wake_queue(hw, sta->tid_to_tx_q[tid]);
 843         }
 844         spin_unlock_bh(&sta->lock);
 845         rcu_read_unlock();
 846 }
 847 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb);
 848
 849 void ieee80211_stop_tx_ba_cb(struct ieee80211_hw *hw, u8 *ra, u8 tid)
 850 {
 851         struct ieee80211_local *local = hw_to_local(hw);
 852         struct sta_info *sta;
 853         u8 *state;
 854         int agg_queue;
 855         DECLARE_MAC_BUF(mac);
 856
 857         if (tid >= STA_TID_NUM) {
 858 #ifdef CONFIG_MAC80211_HT_DEBUG
 859                 printk(KERN_DEBUG "Bad TID value: tid = %d (>= %d)\n",
 860                                 tid, STA_TID_NUM);
 861 #endif
 862                 return;
 863         }
 864
 865 #ifdef CONFIG_MAC80211_HT_DEBUG
 866         printk(KERN_DEBUG "Stopping Tx BA session for %s tid %d\n",
 867                                 print_mac(mac, ra), tid);
 868 #endif /* CONFIG_MAC80211_HT_DEBUG */
 869
 870         rcu_read_lock();
 871         sta = sta_info_get(local, ra);
 872         if (!sta) {
 873 #ifdef CONFIG_MAC80211_HT_DEBUG
 874                 printk(KERN_DEBUG "Could not find station: %s\n",
 875                                 print_mac(mac, ra));
 876 #endif
 877                 rcu_read_unlock();
 878                 return;
 879         }
 880         state = &sta->ampdu_mlme.tid_state_tx[tid];
 881
 882         /* NOTE: no need to use sta->lock in this state check, as
 883          * ieee80211_stop_tx_ba_session will let only one stop call to
 884          * pass through per sta/tid
 885          */
 886         if ((*state & HT_AGG_STATE_REQ_STOP_BA_MSK) == 0) {
 887 #ifdef CONFIG_MAC80211_HT_DEBUG
 888                 printk(KERN_DEBUG "unexpected callback to A-MPDU stop\n");
 889 #endif
 890                 rcu_read_unlock();
 891                 return;
 892         }
 893
 894         if (*state & HT_AGG_STATE_INITIATOR_MSK)
 895                 ieee80211_send_delba(sta->sdata, ra, tid,
 896                         WLAN_BACK_INITIATOR, WLAN_REASON_QSTA_NOT_USE);
 897
 898         agg_queue = sta->tid_to_tx_q[tid];
 899
 900         ieee80211_ht_agg_queue_remove(local, sta, tid, 1);
 901
 902         /* We just requeued the all the frames that were in the
 903          * removed queue, and since we might miss a softirq we do
 904          * netif_schedule_queue.  ieee80211_wake_queue is not used
 905          * here as this queue is not necessarily stopped
 906          */
 907         netif_schedule_queue(netdev_get_tx_queue(local->mdev, agg_queue));
 908         spin_lock_bh(&sta->lock);
 909         *state = HT_AGG_STATE_IDLE;
 910         sta->ampdu_mlme.addba_req_num[tid] = 0;
 911         kfree(sta->ampdu_mlme.tid_tx[tid]);
 912         sta->ampdu_mlme.tid_tx[tid] = NULL;
 913         spin_unlock_bh(&sta->lock);
 914
 915         rcu_read_unlock();
 916 }
 917 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb);
 918
 919 void ieee80211_start_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
 920                                       const u8 *ra, u16 tid)
 921 {
 922         struct ieee80211_local *local = hw_to_local(hw);
 923         struct ieee80211_ra_tid *ra_tid;
 924         struct sk_buff *skb = dev_alloc_skb(0);
 925
 926         if (unlikely(!skb)) {
 927 #ifdef CONFIG_MAC80211_HT_DEBUG
 928                 if (net_ratelimit())
 929                         printk(KERN_WARNING "%s: Not enough memory, "
 930                                "dropping start BA session", skb->dev->name);
 931 #endif
 932                 return;
 933         }
 934         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 935         memcpy(&ra_tid->ra, ra, ETH_ALEN);
 936         ra_tid->tid = tid;
 937
 938         skb->pkt_type = IEEE80211_ADDBA_MSG;
 939         skb_queue_tail(&local->skb_queue, skb);
 940         tasklet_schedule(&local->tasklet);
 941 }
 942 EXPORT_SYMBOL(ieee80211_start_tx_ba_cb_irqsafe);
 943
 944 void ieee80211_stop_tx_ba_cb_irqsafe(struct ieee80211_hw *hw,
 945                                      const u8 *ra, u16 tid)
 946 {
 947         struct ieee80211_local *local = hw_to_local(hw);
 948         struct ieee80211_ra_tid *ra_tid;
 949         struct sk_buff *skb = dev_alloc_skb(0);
 950
 951         if (unlikely(!skb)) {
 952 #ifdef CONFIG_MAC80211_HT_DEBUG
 953                 if (net_ratelimit())
 954                         printk(KERN_WARNING "%s: Not enough memory, "
 955                                "dropping stop BA session", skb->dev->name);
 956 #endif
 957                 return;
 958         }
 959         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 960         memcpy(&ra_tid->ra, ra, ETH_ALEN);
 961         ra_tid->tid = tid;
 962
 963         skb->pkt_type = IEEE80211_DELBA_MSG;
 964         skb_queue_tail(&local->skb_queue, skb);
 965         tasklet_schedule(&local->tasklet);
 966 }
 967 EXPORT_SYMBOL(ieee80211_stop_tx_ba_cb_irqsafe);
 968
 969 static void ieee80211_set_multicast_list(struct net_device *dev)
 970 {
 971         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 972         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 973         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 974
 975         allmulti = !!(dev->flags & IFF_ALLMULTI);
 976         promisc = !!(dev->flags & IFF_PROMISC);
 977         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 978         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 979
 980         if (allmulti != sdata_allmulti) {
 981                 if (dev->flags & IFF_ALLMULTI)
 982                         atomic_inc(&local->iff_allmultis);
 983                 else
 984                         atomic_dec(&local->iff_allmultis);
 985                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 986         }
 987
 988         if (promisc != sdata_promisc) {
 989                 if (dev->flags & IFF_PROMISC)
 990                         atomic_inc(&local->iff_promiscs);
 991                 else
 992                         atomic_dec(&local->iff_promiscs);
 993                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 994         }
 995
 996         dev_mc_sync(local->mdev, dev);
 997 }
 998
 999 static const struct header_ops ieee80211_header_ops = {
1000         .create         = eth_header,
1001         .parse          = header_parse_80211,
1002         .rebuild        = eth_rebuild_header,
1003         .cache          = eth_header_cache,
1004         .cache_update   = eth_header_cache_update,
1005 };
1006
1007 void ieee80211_if_setup(struct net_device *dev)
1008 {
1009         ether_setup(dev);
1010         dev->hard_start_xmit = ieee80211_subif_start_xmit;
1011         dev->wireless_handlers = &ieee80211_iw_handler_def;
1012         dev->set_multicast_list = ieee80211_set_multicast_list;
1013         dev->change_mtu = ieee80211_change_mtu;
1014         dev->open = ieee80211_open;
1015         dev->stop = ieee80211_stop;
1016         dev->destructor = free_netdev;
1017         /* we will validate the address ourselves in ->open */
1018         dev->validate_addr = NULL;
1019 }
1020
1021 /* everything else */
1022
1023 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
1024 {
1025         struct ieee80211_local *local = sdata->local;
1026         struct ieee80211_if_conf conf;
1027
1028         if (WARN_ON(!netif_running(sdata->dev)))
1029                 return 0;
1030
1031         if (!local->ops->config_interface)
1032                 return 0;
1033
1034         memset(&conf, 0, sizeof(conf));
1035         conf.changed = changed;
1036
1037         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
1038             sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
1039                 conf.bssid = sdata->u.sta.bssid;
1040                 conf.ssid = sdata->u.sta.ssid;
1041                 conf.ssid_len = sdata->u.sta.ssid_len;
1042         } else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
1043                 conf.bssid = sdata->dev->dev_addr;
1044                 conf.ssid = sdata->u.ap.ssid;
1045                 conf.ssid_len = sdata->u.ap.ssid_len;
1046         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
1047                 u8 zero[ETH_ALEN] = { 0 };
1048                 conf.bssid = zero;
1049                 conf.ssid = zero;
1050                 conf.ssid_len = 0;
1051         } else {
1052                 WARN_ON(1);
1053                 return -EINVAL;
1054         }
1055
1056         if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
1057                 return -EINVAL;
1058
1059         if (WARN_ON(!conf.ssid && (changed & IEEE80211_IFCC_SSID)))
1060                 return -EINVAL;
1061
1062         return local->ops->config_interface(local_to_hw(local),
1063                                             &sdata->vif, &conf);
1064 }
1065
1066 int ieee80211_hw_config(struct ieee80211_local *local)
1067 {
1068         struct ieee80211_channel *chan;
1069         int ret = 0;
1070
1071         if (local->sta_sw_scanning)
1072                 chan = local->scan_channel;
1073         else
1074                 chan = local->oper_channel;
1075
1076         local->hw.conf.channel = chan;
1077
1078         if (!local->hw.conf.power_level)
1079                 local->hw.conf.power_level = chan->max_power;
1080         else
1081                 local->hw.conf.power_level = min(chan->max_power,
1082                                                local->hw.conf.power_level);
1083
1084         local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
1085
1086 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1087         printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
1088                wiphy_name(local->hw.wiphy), chan->center_freq);
1089 #endif
1090
1091         if (local->open_count)
1092                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
1093
1094         return ret;
1095 }
1096
1097 /**
1098  * ieee80211_handle_ht should be used only after legacy configuration
1099  * has been determined namely band, as ht configuration depends upon
1100  * the hardware's HT abilities for a _specific_ band.
1101  */
1102 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
1103                            struct ieee80211_ht_info *req_ht_cap,
1104                            struct ieee80211_ht_bss_info *req_bss_cap)
1105 {
1106         struct ieee80211_conf *conf = &local->hw.conf;
1107         struct ieee80211_supported_band *sband;
1108         struct ieee80211_ht_info ht_conf;
1109         struct ieee80211_ht_bss_info ht_bss_conf;
1110         u32 changed = 0;
1111         int i;
1112         u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS;
1113         u8 tx_mcs_set_cap;
1114
1115         sband = local->hw.wiphy->bands[conf->channel->band];
1116
1117         memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
1118         memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
1119
1120         /* HT is not supported */
1121         if (!sband->ht_info.ht_supported) {
1122                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1123                 goto out;
1124         }
1125
1126         /* disable HT */
1127         if (!enable_ht) {
1128                 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
1129                         changed |= BSS_CHANGED_HT;
1130                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
1131                 conf->ht_conf.ht_supported = 0;
1132                 goto out;
1133         }
1134
1135
1136         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
1137                 changed |= BSS_CHANGED_HT;
1138
1139         conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
1140         ht_conf.ht_supported = 1;
1141
1142         ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
1143         ht_conf.cap &= ~(IEEE80211_HT_CAP_SM_PS);
1144         ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_SM_PS;
1145         ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
1146         ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
1147         ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
1148
1149         ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
1150         ht_conf.ampdu_density = req_ht_cap->ampdu_density;
1151
1152         /* Bits 96-100 */
1153         tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12];
1154
1155         /* configure suppoerted Tx MCS according to requested MCS
1156          * (based in most cases on Rx capabilities of peer) and self
1157          * Tx MCS capabilities (as defined by low level driver HW
1158          * Tx capabilities) */
1159         if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED))
1160                 goto check_changed;
1161
1162         /* Counting from 0 therfore + 1 */
1163         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF)
1164                 max_tx_streams = ((tx_mcs_set_cap &
1165                                 IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1;
1166
1167         for (i = 0; i < max_tx_streams; i++)
1168                 ht_conf.supp_mcs_set[i] =
1169                         sband->ht_info.supp_mcs_set[i] &
1170                                         req_ht_cap->supp_mcs_set[i];
1171
1172         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM)
1173                 for (i = IEEE80211_SUPP_MCS_SET_UEQM;
1174                      i < IEEE80211_SUPP_MCS_SET_LEN; i++)
1175                         ht_conf.supp_mcs_set[i] =
1176                                 sband->ht_info.supp_mcs_set[i] &
1177                                         req_ht_cap->supp_mcs_set[i];
1178
1179 check_changed:
1180         /* if bss configuration changed store the new one */
1181         if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
1182             memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
1183                 changed |= BSS_CHANGED_HT;
1184                 memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
1185                 memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
1186         }
1187 out:
1188         return changed;
1189 }
1190
1191 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
1192                                       u32 changed)
1193 {
1194         struct ieee80211_local *local = sdata->local;
1195
1196         if (!changed)
1197                 return;
1198
1199         if (local->ops->bss_info_changed)
1200                 local->ops->bss_info_changed(local_to_hw(local),
1201                                              &sdata->vif,
1202                                              &sdata->bss_conf,
1203                                              changed);
1204 }
1205
1206 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
1207 {
1208         sdata->bss_conf.use_cts_prot = 0;
1209         sdata->bss_conf.use_short_preamble = 0;
1210         return BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE;
1211 }
1212
1213 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
1214                                  struct sk_buff *skb)
1215 {
1216         struct ieee80211_local *local = hw_to_local(hw);
1217         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1218         int tmp;
1219
1220         skb->dev = local->mdev;
1221         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
1222         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
1223                        &local->skb_queue : &local->skb_queue_unreliable, skb);
1224         tmp = skb_queue_len(&local->skb_queue) +
1225                 skb_queue_len(&local->skb_queue_unreliable);
1226         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
1227                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1228                 dev_kfree_skb_irq(skb);
1229                 tmp--;
1230                 I802_DEBUG_INC(local->tx_status_drop);
1231         }
1232         tasklet_schedule(&local->tasklet);
1233 }
1234 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
1235
1236 static void ieee80211_tasklet_handler(unsigned long data)
1237 {
1238         struct ieee80211_local *local = (struct ieee80211_local *) data;
1239         struct sk_buff *skb;
1240         struct ieee80211_rx_status rx_status;
1241         struct ieee80211_ra_tid *ra_tid;
1242
1243         while ((skb = skb_dequeue(&local->skb_queue)) ||
1244                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
1245                 switch (skb->pkt_type) {
1246                 case IEEE80211_RX_MSG:
1247                         /* status is in skb->cb */
1248                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
1249                         /* Clear skb->pkt_type in order to not confuse kernel
1250                          * netstack. */
1251                         skb->pkt_type = 0;
1252                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
1253                         break;
1254                 case IEEE80211_TX_STATUS_MSG:
1255                         skb->pkt_type = 0;
1256                         ieee80211_tx_status(local_to_hw(local), skb);
1257                         break;
1258                 case IEEE80211_DELBA_MSG:
1259                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1260                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
1261                                                 ra_tid->ra, ra_tid->tid);
1262                         dev_kfree_skb(skb);
1263                         break;
1264                 case IEEE80211_ADDBA_MSG:
1265                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
1266                         ieee80211_start_tx_ba_cb(local_to_hw(local),
1267                                                  ra_tid->ra, ra_tid->tid);
1268                         dev_kfree_skb(skb);
1269                         break ;
1270                 default:
1271                         WARN_ON(1);
1272                         dev_kfree_skb(skb);
1273                         break;
1274                 }
1275         }
1276 }
1277
1278 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
1279  * make a prepared TX frame (one that has been given to hw) to look like brand
1280  * new IEEE 802.11 frame that is ready to go through TX processing again.
1281  */
1282 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
1283                                       struct ieee80211_key *key,
1284                                       struct sk_buff *skb)
1285 {
1286         unsigned int hdrlen, iv_len, mic_len;
1287         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
1288
1289         hdrlen = ieee80211_hdrlen(hdr->frame_control);
1290
1291         if (!key)
1292                 goto no_key;
1293
1294         switch (key->conf.alg) {
1295         case ALG_WEP:
1296                 iv_len = WEP_IV_LEN;
1297                 mic_len = WEP_ICV_LEN;
1298                 break;
1299         case ALG_TKIP:
1300                 iv_len = TKIP_IV_LEN;
1301                 mic_len = TKIP_ICV_LEN;
1302                 break;
1303         case ALG_CCMP:
1304                 iv_len = CCMP_HDR_LEN;
1305                 mic_len = CCMP_MIC_LEN;
1306                 break;
1307         default:
1308                 goto no_key;
1309         }
1310
1311         if (skb->len >= hdrlen + mic_len &&
1312             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
1313                 skb_trim(skb, skb->len - mic_len);
1314         if (skb->len >= hdrlen + iv_len) {
1315                 memmove(skb->data + iv_len, skb->data, hdrlen);
1316                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
1317         }
1318
1319 no_key:
1320         if (ieee80211_is_data_qos(hdr->frame_control)) {
1321                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
1322                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
1323                         hdrlen - IEEE80211_QOS_CTL_LEN);
1324                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
1325         }
1326 }
1327
1328 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
1329                                             struct sta_info *sta,
1330                                             struct sk_buff *skb)
1331 {
1332         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1333
1334         sta->tx_filtered_count++;
1335
1336         /*
1337          * Clear the TX filter mask for this STA when sending the next
1338          * packet. If the STA went to power save mode, this will happen
1339          * when it wakes up for the next time.
1340          */
1341         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
1342
1343         /*
1344          * This code races in the following way:
1345          *
1346          *  (1) STA sends frame indicating it will go to sleep and does so
1347          *  (2) hardware/firmware adds STA to filter list, passes frame up
1348          *  (3) hardware/firmware processes TX fifo and suppresses a frame
1349          *  (4) we get TX status before having processed the frame and
1350          *      knowing that the STA has gone to sleep.
1351          *
1352          * This is actually quite unlikely even when both those events are
1353          * processed from interrupts coming in quickly after one another or
1354          * even at the same time because we queue both TX status events and
1355          * RX frames to be processed by a tasklet and process them in the
1356          * same order that they were received or TX status last. Hence, there
1357          * is no race as long as the frame RX is processed before the next TX
1358          * status, which drivers can ensure, see below.
1359          *
1360          * Note that this can only happen if the hardware or firmware can
1361          * actually add STAs to the filter list, if this is done by the
1362          * driver in response to set_tim() (which will only reduce the race
1363          * this whole filtering tries to solve, not completely solve it)
1364          * this situation cannot happen.
1365          *
1366          * To completely solve this race drivers need to make sure that they
1367          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
1368          *      functions and
1369          *  (b) always process RX events before TX status events if ordering
1370          *      can be unknown, for example with different interrupt status
1371          *      bits.
1372          */
1373         if (test_sta_flags(sta, WLAN_STA_PS) &&
1374             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
1375                 ieee80211_remove_tx_extra(local, sta->key, skb);
1376                 skb_queue_tail(&sta->tx_filtered, skb);
1377                 return;
1378         }
1379
1380         if (!test_sta_flags(sta, WLAN_STA_PS) &&
1381             !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
1382                 /* Software retry the packet once */
1383                 info->flags |= IEEE80211_TX_CTL_REQUEUE;
1384                 ieee80211_remove_tx_extra(local, sta->key, skb);
1385                 dev_queue_xmit(skb);
1386                 return;
1387         }
1388
1389 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1390         if (net_ratelimit())
1391                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
1392                        "queue_len=%d PS=%d @%lu\n",
1393                        wiphy_name(local->hw.wiphy),
1394                        skb_queue_len(&sta->tx_filtered),
1395                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
1396 #endif
1397         dev_kfree_skb(skb);
1398 }
1399
1400 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1401 {
1402         struct sk_buff *skb2;
1403         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1404         struct ieee80211_local *local = hw_to_local(hw);
1405         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1406         u16 frag, type;
1407         __le16 fc;
1408         struct ieee80211_tx_status_rtap_hdr *rthdr;
1409         struct ieee80211_sub_if_data *sdata;
1410         struct net_device *prev_dev = NULL;
1411         struct sta_info *sta;
1412
1413         rcu_read_lock();
1414
1415         if (info->status.excessive_retries) {
1416                 sta = sta_info_get(local, hdr->addr1);
1417                 if (sta) {
1418                         if (test_sta_flags(sta, WLAN_STA_PS)) {
1419                                 /*
1420                                  * The STA is in power save mode, so assume
1421                                  * that this TX packet failed because of that.
1422                                  */
1423                                 ieee80211_handle_filtered_frame(local, sta, skb);
1424                                 rcu_read_unlock();
1425                                 return;
1426                         }
1427                 }
1428         }
1429
1430         fc = hdr->frame_control;
1431
1432         if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
1433             (ieee80211_is_data_qos(fc))) {
1434                 u16 tid, ssn;
1435                 u8 *qc;
1436                 sta = sta_info_get(local, hdr->addr1);
1437                 if (sta) {
1438                         qc = ieee80211_get_qos_ctl(hdr);
1439                         tid = qc[0] & 0xf;
1440                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
1441                                                 & IEEE80211_SCTL_SEQ);
1442                         ieee80211_send_bar(sta->sdata, hdr->addr1,
1443                                            tid, ssn);
1444                 }
1445         }
1446
1447         if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
1448                 sta = sta_info_get(local, hdr->addr1);
1449                 if (sta) {
1450                         ieee80211_handle_filtered_frame(local, sta, skb);
1451                         rcu_read_unlock();
1452                         return;
1453                 }
1454         } else
1455                 rate_control_tx_status(local->mdev, skb);
1456
1457         rcu_read_unlock();
1458
1459         ieee80211_led_tx(local, 0);
1460
1461         /* SNMP counters
1462          * Fragments are passed to low-level drivers as separate skbs, so these
1463          * are actually fragments, not frames. Update frame counters only for
1464          * the first fragment of the frame. */
1465
1466         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
1467         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
1468
1469         if (info->flags & IEEE80211_TX_STAT_ACK) {
1470                 if (frag == 0) {
1471                         local->dot11TransmittedFrameCount++;
1472                         if (is_multicast_ether_addr(hdr->addr1))
1473                                 local->dot11MulticastTransmittedFrameCount++;
1474                         if (info->status.retry_count > 0)
1475                                 local->dot11RetryCount++;
1476                         if (info->status.retry_count > 1)
1477                                 local->dot11MultipleRetryCount++;
1478                 }
1479
1480                 /* This counter shall be incremented for an acknowledged MPDU
1481                  * with an individual address in the address 1 field or an MPDU
1482                  * with a multicast address in the address 1 field of type Data
1483                  * or Management. */
1484                 if (!is_multicast_ether_addr(hdr->addr1) ||
1485                     type == IEEE80211_FTYPE_DATA ||
1486                     type == IEEE80211_FTYPE_MGMT)
1487                         local->dot11TransmittedFragmentCount++;
1488         } else {
1489                 if (frag == 0)
1490                         local->dot11FailedCount++;
1491         }
1492
1493         /* this was a transmitted frame, but now we want to reuse it */
1494         skb_orphan(skb);
1495
1496         /*
1497          * This is a bit racy but we can avoid a lot of work
1498          * with this test...
1499          */
1500         if (!local->monitors && !local->cooked_mntrs) {
1501                 dev_kfree_skb(skb);
1502                 return;
1503         }
1504
1505         /* send frame to monitor interfaces now */
1506
1507         if (skb_headroom(skb) < sizeof(*rthdr)) {
1508                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
1509                 dev_kfree_skb(skb);
1510                 return;
1511         }
1512
1513         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
1514                                 skb_push(skb, sizeof(*rthdr));
1515
1516         memset(rthdr, 0, sizeof(*rthdr));
1517         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1518         rthdr->hdr.it_present =
1519                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
1520                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
1521
1522         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
1523             !is_multicast_ether_addr(hdr->addr1))
1524                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
1525
1526         if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
1527             (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
1528                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
1529         else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
1530                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
1531
1532         rthdr->data_retries = info->status.retry_count;
1533
1534         /* XXX: is this sufficient for BPF? */
1535         skb_set_mac_header(skb, 0);
1536         skb->ip_summed = CHECKSUM_UNNECESSARY;
1537         skb->pkt_type = PACKET_OTHERHOST;
1538         skb->protocol = htons(ETH_P_802_2);
1539         memset(skb->cb, 0, sizeof(skb->cb));
1540
1541         rcu_read_lock();
1542         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1543                 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) {
1544                         if (!netif_running(sdata->dev))
1545                                 continue;
1546
1547                         if (prev_dev) {
1548                                 skb2 = skb_clone(skb, GFP_ATOMIC);
1549                                 if (skb2) {
1550                                         skb2->dev = prev_dev;
1551                                         netif_rx(skb2);
1552                                 }
1553                         }
1554
1555                         prev_dev = sdata->dev;
1556                 }
1557         }
1558         if (prev_dev) {
1559                 skb->dev = prev_dev;
1560                 netif_rx(skb);
1561                 skb = NULL;
1562         }
1563         rcu_read_unlock();
1564         dev_kfree_skb(skb);
1565 }
1566 EXPORT_SYMBOL(ieee80211_tx_status);
1567
1568 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1569                                         const struct ieee80211_ops *ops)
1570 {
1571         struct ieee80211_local *local;
1572         int priv_size;
1573         struct wiphy *wiphy;
1574
1575         /* Ensure 32-byte alignment of our private data and hw private data.
1576          * We use the wiphy priv data for both our ieee80211_local and for
1577          * the driver's private data
1578          *
1579          * In memory it'll be like this:
1580          *
1581          * +-------------------------+
1582          * | struct wiphy           |
1583          * +-------------------------+
1584          * | struct ieee80211_local  |
1585          * +-------------------------+
1586          * | driver's private data   |
1587          * +-------------------------+
1588          *
1589          */
1590         priv_size = ((sizeof(struct ieee80211_local) +
1591                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
1592                     priv_data_len;
1593
1594         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
1595
1596         if (!wiphy)
1597                 return NULL;
1598
1599         wiphy->privid = mac80211_wiphy_privid;
1600
1601         local = wiphy_priv(wiphy);
1602         local->hw.wiphy = wiphy;
1603
1604         local->hw.priv = (char *)local +
1605                          ((sizeof(struct ieee80211_local) +
1606                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
1607
1608         BUG_ON(!ops->tx);
1609         BUG_ON(!ops->start);
1610         BUG_ON(!ops->stop);
1611         BUG_ON(!ops->config);
1612         BUG_ON(!ops->add_interface);
1613         BUG_ON(!ops->remove_interface);
1614         BUG_ON(!ops->configure_filter);
1615         local->ops = ops;
1616
1617         local->hw.queues = 1; /* default */
1618
1619         local->bridge_packets = 1;
1620
1621         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
1622         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1623         local->short_retry_limit = 7;
1624         local->long_retry_limit = 4;
1625         local->hw.conf.radio_enabled = 1;
1626
1627         INIT_LIST_HEAD(&local->interfaces);
1628
1629         spin_lock_init(&local->key_lock);
1630
1631         INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1632
1633         sta_info_init(local);
1634
1635         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1636                      (unsigned long)local);
1637         tasklet_disable(&local->tx_pending_tasklet);
1638
1639         tasklet_init(&local->tasklet,
1640                      ieee80211_tasklet_handler,
1641                      (unsigned long) local);
1642         tasklet_disable(&local->tasklet);
1643
1644         skb_queue_head_init(&local->skb_queue);
1645         skb_queue_head_init(&local->skb_queue_unreliable);
1646
1647         return local_to_hw(local);
1648 }
1649 EXPORT_SYMBOL(ieee80211_alloc_hw);
1650
1651 int ieee80211_register_hw(struct ieee80211_hw *hw)
1652 {
1653         struct ieee80211_local *local = hw_to_local(hw);
1654         const char *name;
1655         int result;
1656         enum ieee80211_band band;
1657         struct net_device *mdev;
1658         struct wireless_dev *mwdev;
1659
1660         /*
1661          * generic code guarantees at least one band,
1662          * set this very early because much code assumes
1663          * that hw.conf.channel is assigned
1664          */
1665         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1666                 struct ieee80211_supported_band *sband;
1667
1668                 sband = local->hw.wiphy->bands[band];
1669                 if (sband) {
1670                         /* init channel we're on */
1671                         local->hw.conf.channel =
1672                         local->oper_channel =
1673                         local->scan_channel = &sband->channels[0];
1674                         break;
1675                 }
1676         }
1677
1678         /* if low-level driver supports AP, we also support VLAN */
1679         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
1680                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
1681
1682         /* mac80211 always supports monitor */
1683         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
1684
1685         result = wiphy_register(local->hw.wiphy);
1686         if (result < 0)
1687                 return result;
1688
1689         /*
1690          * We use the number of queues for feature tests (QoS, HT) internally
1691          * so restrict them appropriately.
1692          */
1693         if (hw->queues > IEEE80211_MAX_QUEUES)
1694                 hw->queues = IEEE80211_MAX_QUEUES;
1695         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
1696                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
1697         if (hw->queues < 4)
1698                 hw->ampdu_queues = 0;
1699
1700         mdev = alloc_netdev_mq(sizeof(struct wireless_dev),
1701                                "wmaster%d", ether_setup,
1702                                ieee80211_num_queues(hw));
1703         if (!mdev)
1704                 goto fail_mdev_alloc;
1705
1706         mwdev = netdev_priv(mdev);
1707         mdev->ieee80211_ptr = mwdev;
1708         mwdev->wiphy = local->hw.wiphy;
1709
1710         local->mdev = mdev;
1711
1712         ieee80211_rx_bss_list_init(local);
1713
1714         mdev->hard_start_xmit = ieee80211_master_start_xmit;
1715         mdev->open = ieee80211_master_open;
1716         mdev->stop = ieee80211_master_stop;
1717         mdev->type = ARPHRD_IEEE80211;
1718         mdev->header_ops = &ieee80211_header_ops;
1719         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
1720
1721         name = wiphy_dev(local->hw.wiphy)->driver->name;
1722         local->hw.workqueue = create_freezeable_workqueue(name);
1723         if (!local->hw.workqueue) {
1724                 result = -ENOMEM;
1725                 goto fail_workqueue;
1726         }
1727
1728         /*
1729          * The hardware needs headroom for sending the frame,
1730          * and we need some headroom for passing the frame to monitor
1731          * interfaces, but never both at the same time.
1732          */
1733         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1734                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
1735
1736         debugfs_hw_add(local);
1737
1738         if (local->hw.conf.beacon_int < 10)
1739                 local->hw.conf.beacon_int = 100;
1740
1741         if (local->hw.max_listen_interval == 0)
1742                 local->hw.max_listen_interval = 1;
1743
1744         local->hw.conf.listen_interval = local->hw.max_listen_interval;
1745
1746         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
1747                                                   IEEE80211_HW_SIGNAL_DB |
1748                                                   IEEE80211_HW_SIGNAL_DBM) ?
1749                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1750         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
1751                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1752         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
1753                 local->wstats_flags |= IW_QUAL_DBM;
1754
1755         result = sta_info_start(local);
1756         if (result < 0)
1757                 goto fail_sta_info;
1758
1759         rtnl_lock();
1760         result = dev_alloc_name(local->mdev, local->mdev->name);
1761         if (result < 0)
1762                 goto fail_dev;
1763
1764         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1765         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1766
1767         result = register_netdevice(local->mdev);
1768         if (result < 0)
1769                 goto fail_dev;
1770
1771         result = ieee80211_init_rate_ctrl_alg(local,
1772                                               hw->rate_control_algorithm);
1773         if (result < 0) {
1774                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1775                        "algorithm\n", wiphy_name(local->hw.wiphy));
1776                 goto fail_rate;
1777         }
1778
1779         result = ieee80211_wep_init(local);
1780
1781         if (result < 0) {
1782                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
1783                        wiphy_name(local->hw.wiphy), result);
1784                 goto fail_wep;
1785         }
1786
1787         local->mdev->select_queue = ieee80211_select_queue;
1788
1789         /* add one default STA interface */
1790         result = ieee80211_if_add(local, "wlan%d", NULL,
1791                                   IEEE80211_IF_TYPE_STA, NULL);
1792         if (result)
1793                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1794                        wiphy_name(local->hw.wiphy));
1795
1796         rtnl_unlock();
1797
1798         ieee80211_led_init(local);
1799
1800         return 0;
1801
1802 fail_wep:
1803         rate_control_deinitialize(local);
1804 fail_rate:
1805         unregister_netdevice(local->mdev);
1806         local->mdev = NULL;
1807 fail_dev:
1808         rtnl_unlock();
1809         sta_info_stop(local);
1810 fail_sta_info:
1811         debugfs_hw_del(local);
1812         destroy_workqueue(local->hw.workqueue);
1813 fail_workqueue:
1814         if (local->mdev)
1815                 free_netdev(local->mdev);
1816 fail_mdev_alloc:
1817         wiphy_unregister(local->hw.wiphy);
1818         return result;
1819 }
1820 EXPORT_SYMBOL(ieee80211_register_hw);
1821
1822 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1823 {
1824         struct ieee80211_local *local = hw_to_local(hw);
1825
1826         tasklet_kill(&local->tx_pending_tasklet);
1827         tasklet_kill(&local->tasklet);
1828
1829         rtnl_lock();
1830
1831         /*
1832          * At this point, interface list manipulations are fine
1833          * because the driver cannot be handing us frames any
1834          * more and the tasklet is killed.
1835          */
1836
1837         /* First, we remove all virtual interfaces. */
1838         ieee80211_remove_interfaces(local);
1839
1840         /* then, finally, remove the master interface */
1841         unregister_netdevice(local->mdev);
1842
1843         rtnl_unlock();
1844
1845         ieee80211_rx_bss_list_deinit(local);
1846         ieee80211_clear_tx_pending(local);
1847         sta_info_stop(local);
1848         rate_control_deinitialize(local);
1849         debugfs_hw_del(local);
1850
1851         if (skb_queue_len(&local->skb_queue)
1852                         || skb_queue_len(&local->skb_queue_unreliable))
1853                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1854                        wiphy_name(local->hw.wiphy));
1855         skb_queue_purge(&local->skb_queue);
1856         skb_queue_purge(&local->skb_queue_unreliable);
1857
1858         destroy_workqueue(local->hw.workqueue);
1859         wiphy_unregister(local->hw.wiphy);
1860         ieee80211_wep_free(local);
1861         ieee80211_led_exit(local);
1862         free_netdev(local->mdev);
1863 }
1864 EXPORT_SYMBOL(ieee80211_unregister_hw);
1865
1866 void ieee80211_free_hw(struct ieee80211_hw *hw)
1867 {
1868         struct ieee80211_local *local = hw_to_local(hw);
1869
1870         wiphy_free(local->hw.wiphy);
1871 }
1872 EXPORT_SYMBOL(ieee80211_free_hw);
1873
1874 static int __init ieee80211_init(void)
1875 {
1876         struct sk_buff *skb;
1877         int ret;
1878
1879         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1880         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1881                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1882
1883         ret = rc80211_pid_init();
1884         if (ret)
1885                 return ret;
1886
1887         ieee80211_debugfs_netdev_init();
1888
1889         return 0;
1890 }
1891
1892 static void __exit ieee80211_exit(void)
1893 {
1894         rc80211_pid_exit();
1895
1896         /*
1897          * For key todo, it'll be empty by now but the work
1898          * might still be scheduled.
1899          */
1900         flush_scheduled_work();
1901
1902         if (mesh_allocated)
1903                 ieee80211s_stop();
1904
1905         ieee80211_debugfs_netdev_exit();
1906 }
1907
1908
1909 subsys_initcall(ieee80211_init);
1910 module_exit(ieee80211_exit);
1911
1912 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1913 MODULE_LICENSE("GPL");