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 == NL80211_IFTYPE_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 == NL80211_IFTYPE_MONITOR ||
 168                 type2 == NL80211_IFTYPE_MONITOR ||
 169                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 170                 (type1 == NL80211_IFTYPE_WDS &&
 171                         (type2 == NL80211_IFTYPE_WDS ||
 172                          type2 == NL80211_IFTYPE_AP)) ||
 173                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 174                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 175                         (type2 == NL80211_IFTYPE_AP ||
 176                          type2 == NL80211_IFTYPE_AP_VLAN));
 177 }
 178
 179 static int ieee80211_open(struct net_device *dev)
 180 {
 181         struct ieee80211_sub_if_data *sdata, *nsdata;
 182         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 183         struct sta_info *sta;
 184         struct ieee80211_if_init_conf conf;
 185         u32 changed = 0;
 186         int res;
 187         bool need_hw_reconfig = 0;
 188         u8 null_addr[ETH_ALEN] = {0};
 189
 190         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 191
 192         /* fail early if user set an invalid address */
 193         if (compare_ether_addr(dev->dev_addr, null_addr) &&
 194             !is_valid_ether_addr(dev->dev_addr))
 195                 return -EADDRNOTAVAIL;
 196
 197         /* we hold the RTNL here so can safely walk the list */
 198         list_for_each_entry(nsdata, &local->interfaces, list) {
 199                 struct net_device *ndev = nsdata->dev;
 200
 201                 if (ndev != dev && netif_running(ndev)) {
 202                         /*
 203                          * Allow only a single IBSS interface to be up at any
 204                          * time. This is restricted because beacon distribution
 205                          * cannot work properly if both are in the same IBSS.
 206                          *
 207                          * To remove this restriction we'd have to disallow them
 208                          * from setting the same SSID on different IBSS interfaces
 209                          * belonging to the same hardware. Then, however, we're
 210                          * faced with having to adopt two different TSF timers...
 211                          */
 212                         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 213                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 214                                 return -EBUSY;
 215
 216                         /*
 217                          * The remaining checks are only performed for interfaces
 218                          * with the same MAC address.
 219                          */
 220                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 221                                 continue;
 222
 223                         /*
 224                          * check whether it may have the same address
 225                          */
 226                         if (!identical_mac_addr_allowed(sdata->vif.type,
 227                                                         nsdata->vif.type))
 228                                 return -ENOTUNIQ;
 229
 230                         /*
 231                          * can only add VLANs to enabled APs
 232                          */
 233                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
 234                             nsdata->vif.type == NL80211_IFTYPE_AP)
 235                                 sdata->bss = &nsdata->u.ap;
 236                 }
 237         }
 238
 239         switch (sdata->vif.type) {
 240         case NL80211_IFTYPE_WDS:
 241                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 242                         return -ENOLINK;
 243                 break;
 244         case NL80211_IFTYPE_AP_VLAN:
 245                 if (!sdata->bss)
 246                         return -ENOLINK;
 247                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 248                 break;
 249         case NL80211_IFTYPE_AP:
 250                 sdata->bss = &sdata->u.ap;
 251                 break;
 252         case NL80211_IFTYPE_MESH_POINT:
 253                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 254                         break;
 255                 /* mesh ifaces must set allmulti to forward mcast traffic */
 256                 atomic_inc(&local->iff_allmultis);
 257                 break;
 258         case NL80211_IFTYPE_STATION:
 259         case NL80211_IFTYPE_MONITOR:
 260         case NL80211_IFTYPE_ADHOC:
 261                 /* no special treatment */
 262                 break;
 263         case NL80211_IFTYPE_UNSPECIFIED:
 264         case __NL80211_IFTYPE_AFTER_LAST:
 265                 /* cannot happen */
 266                 WARN_ON(1);
 267                 break;
 268         }
 269
 270         if (local->open_count == 0) {
 271                 res = 0;
 272                 if (local->ops->start)
 273                         res = local->ops->start(local_to_hw(local));
 274                 if (res)
 275                         goto err_del_bss;
 276                 need_hw_reconfig = 1;
 277                 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
 278         }
 279
 280         /*
 281          * Check all interfaces and copy the hopefully now-present
 282          * MAC address to those that have the special null one.
 283          */
 284         list_for_each_entry(nsdata, &local->interfaces, list) {
 285                 struct net_device *ndev = nsdata->dev;
 286
 287                 /*
 288                  * No need to check netif_running since we do not allow
 289                  * it to start up with this invalid address.
 290                  */
 291                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
 292                         memcpy(ndev->dev_addr,
 293                                local->hw.wiphy->perm_addr,
 294                                ETH_ALEN);
 295         }
 296
 297         if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0)
 298                 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr,
 299                        ETH_ALEN);
 300
 301         /*
 302          * Validate the MAC address for this device.
 303          */
 304         if (!is_valid_ether_addr(dev->dev_addr)) {
 305                 if (!local->open_count && local->ops->stop)
 306                         local->ops->stop(local_to_hw(local));
 307                 return -EADDRNOTAVAIL;
 308         }
 309
 310         switch (sdata->vif.type) {
 311         case NL80211_IFTYPE_AP_VLAN:
 312                 /* no need to tell driver */
 313                 break;
 314         case NL80211_IFTYPE_MONITOR:
 315                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 316                         local->cooked_mntrs++;
 317                         break;
 318                 }
 319
 320                 /* must be before the call to ieee80211_configure_filter */
 321                 local->monitors++;
 322                 if (local->monitors == 1)
 323                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 324
 325                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 326                         local->fif_fcsfail++;
 327                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 328                         local->fif_plcpfail++;
 329                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 330                         local->fif_control++;
 331                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 332                         local->fif_other_bss++;
 333
 334                 netif_addr_lock_bh(local->mdev);
 335                 ieee80211_configure_filter(local);
 336                 netif_addr_unlock_bh(local->mdev);
 337                 break;
 338         case NL80211_IFTYPE_STATION:
 339         case NL80211_IFTYPE_ADHOC:
 340                 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
 341                 /* fall through */
 342         default:
 343                 conf.vif = &sdata->vif;
 344                 conf.type = sdata->vif.type;
 345                 conf.mac_addr = dev->dev_addr;
 346                 res = local->ops->add_interface(local_to_hw(local), &conf);
 347                 if (res)
 348                         goto err_stop;
 349
 350                 if (ieee80211_vif_is_mesh(&sdata->vif))
 351                         ieee80211_start_mesh(sdata);
 352                 changed |= ieee80211_reset_erp_info(sdata);
 353                 ieee80211_bss_info_change_notify(sdata, changed);
 354                 ieee80211_enable_keys(sdata);
 355
 356                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 357                     !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
 358                         netif_carrier_off(dev);
 359                 else
 360                         netif_carrier_on(dev);
 361         }
 362
 363         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 364                 /* Create STA entry for the WDS peer */
 365                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 366                                      GFP_KERNEL);
 367                 if (!sta) {
 368                         res = -ENOMEM;
 369                         goto err_del_interface;
 370                 }
 371
 372                 /* no locking required since STA is not live yet */
 373                 sta->flags |= WLAN_STA_AUTHORIZED;
 374
 375                 res = sta_info_insert(sta);
 376                 if (res) {
 377                         /* STA has been freed */
 378                         goto err_del_interface;
 379                 }
 380         }
 381
 382         if (local->open_count == 0) {
 383                 res = dev_open(local->mdev);
 384                 WARN_ON(res);
 385                 if (res)
 386                         goto err_del_interface;
 387                 tasklet_enable(&local->tx_pending_tasklet);
 388                 tasklet_enable(&local->tasklet);
 389         }
 390
 391         /*
 392          * set_multicast_list will be invoked by the networking core
 393          * which will check whether any increments here were done in
 394          * error and sync them down to the hardware as filter flags.
 395          */
 396         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 397                 atomic_inc(&local->iff_allmultis);
 398
 399         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 400                 atomic_inc(&local->iff_promiscs);
 401
 402         local->open_count++;
 403         if (need_hw_reconfig) {
 404                 ieee80211_hw_config(local);
 405                 /*
 406                  * set default queue parameters so drivers don't
 407                  * need to initialise the hardware if the hardware
 408                  * doesn't start up with sane defaults
 409                  */
 410                 ieee80211_set_wmm_default(sdata);
 411         }
 412
 413         /*
 414          * ieee80211_sta_work is disabled while network interface
 415          * is down. Therefore, some configuration changes may not
 416          * yet be effective. Trigger execution of ieee80211_sta_work
 417          * to fix this.
 418          */
 419         if (sdata->vif.type == NL80211_IFTYPE_STATION ||
 420             sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 421                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 422                 queue_work(local->hw.workqueue, &ifsta->work);
 423         }
 424
 425         netif_tx_start_all_queues(dev);
 426
 427         return 0;
 428  err_del_interface:
 429         local->ops->remove_interface(local_to_hw(local), &conf);
 430  err_stop:
 431         if (!local->open_count && local->ops->stop)
 432                 local->ops->stop(local_to_hw(local));
 433  err_del_bss:
 434         sdata->bss = NULL;
 435         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 436                 list_del(&sdata->u.vlan.list);
 437         return res;
 438 }
 439
 440 static int ieee80211_stop(struct net_device *dev)
 441 {
 442         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 443         struct ieee80211_local *local = sdata->local;
 444         struct ieee80211_if_init_conf conf;
 445         struct sta_info *sta;
 446
 447         /*
 448          * Stop TX on this interface first.
 449          */
 450         netif_tx_stop_all_queues(dev);
 451
 452         /*
 453          * Now delete all active aggregation sessions.
 454          */
 455         rcu_read_lock();
 456
 457         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 458                 if (sta->sdata == sdata)
 459                         ieee80211_sta_tear_down_BA_sessions(sdata, sta->addr);
 460         }
 461
 462         rcu_read_unlock();
 463
 464         /*
 465          * Remove all stations associated with this interface.
 466          *
 467          * This must be done before calling ops->remove_interface()
 468          * because otherwise we can later invoke ops->sta_notify()
 469          * whenever the STAs are removed, and that invalidates driver
 470          * assumptions about always getting a vif pointer that is valid
 471          * (because if we remove a STA after ops->remove_interface()
 472          * the driver will have removed the vif info already!)
 473          *
 474          * We could relax this and only unlink the stations from the
 475          * hash table and list but keep them on a per-sdata list that
 476          * will be inserted back again when the interface is brought
 477          * up again, but I don't currently see a use case for that,
 478          * except with WDS which gets a STA entry created when it is
 479          * brought up.
 480          */
 481         sta_info_flush(local, sdata);
 482
 483         /*
 484          * Don't count this interface for promisc/allmulti while it
 485          * is down. dev_mc_unsync() will invoke set_multicast_list
 486          * on the master interface which will sync these down to the
 487          * hardware as filter flags.
 488          */
 489         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 490                 atomic_dec(&local->iff_allmultis);
 491
 492         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 493                 atomic_dec(&local->iff_promiscs);
 494
 495         dev_mc_unsync(local->mdev, dev);
 496
 497         /* APs need special treatment */
 498         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 499                 struct ieee80211_sub_if_data *vlan, *tmp;
 500                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 501
 502                 /* remove beacon */
 503                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 504                 synchronize_rcu();
 505                 kfree(old_beacon);
 506
 507                 /* down all dependent devices, that is VLANs */
 508                 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
 509                                          u.vlan.list)
 510                         dev_close(vlan->dev);
 511                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 512         }
 513
 514         local->open_count--;
 515
 516         switch (sdata->vif.type) {
 517         case NL80211_IFTYPE_AP_VLAN:
 518                 list_del(&sdata->u.vlan.list);
 519                 /* no need to tell driver */
 520                 break;
 521         case NL80211_IFTYPE_MONITOR:
 522                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 523                         local->cooked_mntrs--;
 524                         break;
 525                 }
 526
 527                 local->monitors--;
 528                 if (local->monitors == 0)
 529                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
 530
 531                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 532                         local->fif_fcsfail--;
 533                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 534                         local->fif_plcpfail--;
 535                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 536                         local->fif_control--;
 537                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 538                         local->fif_other_bss--;
 539
 540                 netif_addr_lock_bh(local->mdev);
 541                 ieee80211_configure_filter(local);
 542                 netif_addr_unlock_bh(local->mdev);
 543                 break;
 544         case NL80211_IFTYPE_STATION:
 545         case NL80211_IFTYPE_ADHOC:
 546                 sdata->u.sta.state = IEEE80211_STA_MLME_DISABLED;
 547                 memset(sdata->u.sta.bssid, 0, ETH_ALEN);
 548                 del_timer_sync(&sdata->u.sta.timer);
 549                 /*
 550                  * If the timer fired while we waited for it, it will have
 551                  * requeued the work. Now the work will be running again
 552                  * but will not rearm the timer again because it checks
 553                  * whether the interface is running, which, at this point,
 554                  * it no longer is.
 555                  */
 556                 cancel_work_sync(&sdata->u.sta.work);
 557                 /*
 558                  * When we get here, the interface is marked down.
 559                  * Call synchronize_rcu() to wait for the RX path
 560                  * should it be using the interface and enqueuing
 561                  * frames at this very time on another CPU.
 562                  */
 563                 synchronize_rcu();
 564                 skb_queue_purge(&sdata->u.sta.skb_queue);
 565
 566                 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
 567                 kfree(sdata->u.sta.extra_ie);
 568                 sdata->u.sta.extra_ie = NULL;
 569                 sdata->u.sta.extra_ie_len = 0;
 570                 /* fall through */
 571         case NL80211_IFTYPE_MESH_POINT:
 572                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 573                         /* allmulti is always set on mesh ifaces */
 574                         atomic_dec(&local->iff_allmultis);
 575                         ieee80211_stop_mesh(sdata);
 576                 }
 577                 /* fall through */
 578         default:
 579                 if (local->scan_sdata == sdata) {
 580                         if (!local->ops->hw_scan)
 581                                 cancel_delayed_work_sync(&local->scan_work);
 582                         /*
 583                          * The software scan can no longer run now, so we can
 584                          * clear out the scan_sdata reference. However, the
 585                          * hardware scan may still be running. The complete
 586                          * function must be prepared to handle a NULL value.
 587                          */
 588                         local->scan_sdata = NULL;
 589                         /*
 590                          * The memory barrier guarantees that another CPU
 591                          * that is hardware-scanning will now see the fact
 592                          * that this interface is gone.
 593                          */
 594                         smp_mb();
 595                         /*
 596                          * If software scanning, complete the scan but since
 597                          * the scan_sdata is NULL already don't send out a
 598                          * scan event to userspace -- the scan is incomplete.
 599                          */
 600                         if (local->sw_scanning)
 601                                 ieee80211_scan_completed(&local->hw);
 602                 }
 603
 604                 conf.vif = &sdata->vif;
 605                 conf.type = sdata->vif.type;
 606                 conf.mac_addr = dev->dev_addr;
 607                 /* disable all keys for as long as this netdev is down */
 608                 ieee80211_disable_keys(sdata);
 609                 local->ops->remove_interface(local_to_hw(local), &conf);
 610         }
 611
 612         sdata->bss = NULL;
 613
 614         if (local->open_count == 0) {
 615                 if (netif_running(local->mdev))
 616                         dev_close(local->mdev);
 617
 618                 if (local->ops->stop)
 619                         local->ops->stop(local_to_hw(local));
 620
 621                 ieee80211_led_radio(local, 0);
 622
 623                 flush_workqueue(local->hw.workqueue);
 624
 625                 tasklet_disable(&local->tx_pending_tasklet);
 626                 tasklet_disable(&local->tasklet);
 627         }
 628
 629         return 0;
 630 }
 631
 632 static void ieee80211_set_multicast_list(struct net_device *dev)
 633 {
 634         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 635         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 636         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 637
 638         allmulti = !!(dev->flags & IFF_ALLMULTI);
 639         promisc = !!(dev->flags & IFF_PROMISC);
 640         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 641         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 642
 643         if (allmulti != sdata_allmulti) {
 644                 if (dev->flags & IFF_ALLMULTI)
 645                         atomic_inc(&local->iff_allmultis);
 646                 else
 647                         atomic_dec(&local->iff_allmultis);
 648                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 649         }
 650
 651         if (promisc != sdata_promisc) {
 652                 if (dev->flags & IFF_PROMISC)
 653                         atomic_inc(&local->iff_promiscs);
 654                 else
 655                         atomic_dec(&local->iff_promiscs);
 656                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 657         }
 658
 659         dev_mc_sync(local->mdev, dev);
 660 }
 661
 662 static const struct header_ops ieee80211_header_ops = {
 663         .create         = eth_header,
 664         .parse          = header_parse_80211,
 665         .rebuild        = eth_rebuild_header,
 666         .cache          = eth_header_cache,
 667         .cache_update   = eth_header_cache_update,
 668 };
 669
 670 void ieee80211_if_setup(struct net_device *dev)
 671 {
 672         ether_setup(dev);
 673         dev->hard_start_xmit = ieee80211_subif_start_xmit;
 674         dev->wireless_handlers = &ieee80211_iw_handler_def;
 675         dev->set_multicast_list = ieee80211_set_multicast_list;
 676         dev->change_mtu = ieee80211_change_mtu;
 677         dev->open = ieee80211_open;
 678         dev->stop = ieee80211_stop;
 679         dev->destructor = free_netdev;
 680         /* we will validate the address ourselves in ->open */
 681         dev->validate_addr = NULL;
 682 }
 683
 684 /* everything else */
 685
 686 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
 687 {
 688         struct ieee80211_local *local = sdata->local;
 689         struct ieee80211_if_conf conf;
 690
 691         if (WARN_ON(!netif_running(sdata->dev)))
 692                 return 0;
 693
 694         if (!local->ops->config_interface)
 695                 return 0;
 696
 697         memset(&conf, 0, sizeof(conf));
 698         conf.changed = changed;
 699
 700         if (sdata->vif.type == NL80211_IFTYPE_STATION ||
 701             sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 702                 conf.bssid = sdata->u.sta.bssid;
 703                 conf.ssid = sdata->u.sta.ssid;
 704                 conf.ssid_len = sdata->u.sta.ssid_len;
 705         } else if (sdata->vif.type == NL80211_IFTYPE_AP) {
 706                 conf.bssid = sdata->dev->dev_addr;
 707                 conf.ssid = sdata->u.ap.ssid;
 708                 conf.ssid_len = sdata->u.ap.ssid_len;
 709         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 710                 u8 zero[ETH_ALEN] = { 0 };
 711                 conf.bssid = zero;
 712                 conf.ssid = zero;
 713                 conf.ssid_len = 0;
 714         } else {
 715                 WARN_ON(1);
 716                 return -EINVAL;
 717         }
 718
 719         if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
 720                 return -EINVAL;
 721
 722         if (WARN_ON(!conf.ssid && (changed & IEEE80211_IFCC_SSID)))
 723                 return -EINVAL;
 724
 725         return local->ops->config_interface(local_to_hw(local),
 726                                             &sdata->vif, &conf);
 727 }
 728
 729 int ieee80211_hw_config(struct ieee80211_local *local)
 730 {
 731         struct ieee80211_channel *chan;
 732         int ret = 0;
 733
 734         if (local->sw_scanning)
 735                 chan = local->scan_channel;
 736         else
 737                 chan = local->oper_channel;
 738
 739         local->hw.conf.channel = chan;
 740
 741         if (!local->hw.conf.power_level)
 742                 local->hw.conf.power_level = chan->max_power;
 743         else
 744                 local->hw.conf.power_level = min(chan->max_power,
 745                                                local->hw.conf.power_level);
 746
 747         local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
 748
 749 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 750         printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
 751                wiphy_name(local->hw.wiphy), chan->center_freq);
 752 #endif
 753
 754         if (local->open_count)
 755                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
 756
 757         return ret;
 758 }
 759
 760 /**
 761  * ieee80211_handle_ht should be used only after legacy configuration
 762  * has been determined namely band, as ht configuration depends upon
 763  * the hardware's HT abilities for a _specific_ band.
 764  */
 765 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
 766                            struct ieee80211_ht_info *req_ht_cap,
 767                            struct ieee80211_ht_bss_info *req_bss_cap)
 768 {
 769         struct ieee80211_conf *conf = &local->hw.conf;
 770         struct ieee80211_supported_band *sband;
 771         struct ieee80211_ht_info ht_conf;
 772         struct ieee80211_ht_bss_info ht_bss_conf;
 773         u32 changed = 0;
 774         int i;
 775         u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS;
 776         u8 tx_mcs_set_cap;
 777
 778         sband = local->hw.wiphy->bands[conf->channel->band];
 779
 780         memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
 781         memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
 782
 783         /* HT is not supported */
 784         if (!sband->ht_info.ht_supported) {
 785                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
 786                 goto out;
 787         }
 788
 789         /* disable HT */
 790         if (!enable_ht) {
 791                 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
 792                         changed |= BSS_CHANGED_HT;
 793                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
 794                 conf->ht_conf.ht_supported = 0;
 795                 goto out;
 796         }
 797
 798
 799         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
 800                 changed |= BSS_CHANGED_HT;
 801
 802         conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
 803         ht_conf.ht_supported = 1;
 804
 805         ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
 806         ht_conf.cap &= ~(IEEE80211_HT_CAP_SM_PS);
 807         ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_SM_PS;
 808         ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
 809         ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
 810         ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
 811
 812         ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
 813         ht_conf.ampdu_density = req_ht_cap->ampdu_density;
 814
 815         /* Bits 96-100 */
 816         tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12];
 817
 818         /* configure suppoerted Tx MCS according to requested MCS
 819          * (based in most cases on Rx capabilities of peer) and self
 820          * Tx MCS capabilities (as defined by low level driver HW
 821          * Tx capabilities) */
 822         if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED))
 823                 goto check_changed;
 824
 825         /* Counting from 0 therfore + 1 */
 826         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF)
 827                 max_tx_streams = ((tx_mcs_set_cap &
 828                                 IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1;
 829
 830         for (i = 0; i < max_tx_streams; i++)
 831                 ht_conf.supp_mcs_set[i] =
 832                         sband->ht_info.supp_mcs_set[i] &
 833                                         req_ht_cap->supp_mcs_set[i];
 834
 835         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM)
 836                 for (i = IEEE80211_SUPP_MCS_SET_UEQM;
 837                      i < IEEE80211_SUPP_MCS_SET_LEN; i++)
 838                         ht_conf.supp_mcs_set[i] =
 839                                 sband->ht_info.supp_mcs_set[i] &
 840                                         req_ht_cap->supp_mcs_set[i];
 841
 842 check_changed:
 843         /* if bss configuration changed store the new one */
 844         if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
 845             memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
 846                 changed |= BSS_CHANGED_HT;
 847                 memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
 848                 memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
 849         }
 850 out:
 851         return changed;
 852 }
 853
 854 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 855                                       u32 changed)
 856 {
 857         struct ieee80211_local *local = sdata->local;
 858
 859         if (!changed)
 860                 return;
 861
 862         if (local->ops->bss_info_changed)
 863                 local->ops->bss_info_changed(local_to_hw(local),
 864                                              &sdata->vif,
 865                                              &sdata->bss_conf,
 866                                              changed);
 867 }
 868
 869 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 870 {
 871         sdata->bss_conf.use_cts_prot = 0;
 872         sdata->bss_conf.use_short_preamble = 0;
 873         return BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE;
 874 }
 875
 876 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 877                                  struct sk_buff *skb)
 878 {
 879         struct ieee80211_local *local = hw_to_local(hw);
 880         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 881         int tmp;
 882
 883         skb->dev = local->mdev;
 884         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 885         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 886                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 887         tmp = skb_queue_len(&local->skb_queue) +
 888                 skb_queue_len(&local->skb_queue_unreliable);
 889         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 890                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 891                 dev_kfree_skb_irq(skb);
 892                 tmp--;
 893                 I802_DEBUG_INC(local->tx_status_drop);
 894         }
 895         tasklet_schedule(&local->tasklet);
 896 }
 897 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 898
 899 static void ieee80211_tasklet_handler(unsigned long data)
 900 {
 901         struct ieee80211_local *local = (struct ieee80211_local *) data;
 902         struct sk_buff *skb;
 903         struct ieee80211_rx_status rx_status;
 904         struct ieee80211_ra_tid *ra_tid;
 905
 906         while ((skb = skb_dequeue(&local->skb_queue)) ||
 907                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 908                 switch (skb->pkt_type) {
 909                 case IEEE80211_RX_MSG:
 910                         /* status is in skb->cb */
 911                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 912                         /* Clear skb->pkt_type in order to not confuse kernel
 913                          * netstack. */
 914                         skb->pkt_type = 0;
 915                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 916                         break;
 917                 case IEEE80211_TX_STATUS_MSG:
 918                         skb->pkt_type = 0;
 919                         ieee80211_tx_status(local_to_hw(local), skb);
 920                         break;
 921                 case IEEE80211_DELBA_MSG:
 922                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 923                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
 924                                                 ra_tid->ra, ra_tid->tid);
 925                         dev_kfree_skb(skb);
 926                         break;
 927                 case IEEE80211_ADDBA_MSG:
 928                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 929                         ieee80211_start_tx_ba_cb(local_to_hw(local),
 930                                                  ra_tid->ra, ra_tid->tid);
 931                         dev_kfree_skb(skb);
 932                         break ;
 933                 default:
 934                         WARN_ON(1);
 935                         dev_kfree_skb(skb);
 936                         break;
 937                 }
 938         }
 939 }
 940
 941 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 942  * make a prepared TX frame (one that has been given to hw) to look like brand
 943  * new IEEE 802.11 frame that is ready to go through TX processing again.
 944  */
 945 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 946                                       struct ieee80211_key *key,
 947                                       struct sk_buff *skb)
 948 {
 949         unsigned int hdrlen, iv_len, mic_len;
 950         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 951
 952         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 953
 954         if (!key)
 955                 goto no_key;
 956
 957         switch (key->conf.alg) {
 958         case ALG_WEP:
 959                 iv_len = WEP_IV_LEN;
 960                 mic_len = WEP_ICV_LEN;
 961                 break;
 962         case ALG_TKIP:
 963                 iv_len = TKIP_IV_LEN;
 964                 mic_len = TKIP_ICV_LEN;
 965                 break;
 966         case ALG_CCMP:
 967                 iv_len = CCMP_HDR_LEN;
 968                 mic_len = CCMP_MIC_LEN;
 969                 break;
 970         default:
 971                 goto no_key;
 972         }
 973
 974         if (skb->len >= hdrlen + mic_len &&
 975             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 976                 skb_trim(skb, skb->len - mic_len);
 977         if (skb->len >= hdrlen + iv_len) {
 978                 memmove(skb->data + iv_len, skb->data, hdrlen);
 979                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
 980         }
 981
 982 no_key:
 983         if (ieee80211_is_data_qos(hdr->frame_control)) {
 984                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 985                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
 986                         hdrlen - IEEE80211_QOS_CTL_LEN);
 987                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
 988         }
 989 }
 990
 991 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 992                                             struct sta_info *sta,
 993                                             struct sk_buff *skb)
 994 {
 995         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 996
 997         sta->tx_filtered_count++;
 998
 999         /*
1000          * Clear the TX filter mask for this STA when sending the next
1001          * packet. If the STA went to power save mode, this will happen
1002          * when it wakes up for the next time.
1003          */
1004         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
1005
1006         /*
1007          * This code races in the following way:
1008          *
1009          *  (1) STA sends frame indicating it will go to sleep and does so
1010          *  (2) hardware/firmware adds STA to filter list, passes frame up
1011          *  (3) hardware/firmware processes TX fifo and suppresses a frame
1012          *  (4) we get TX status before having processed the frame and
1013          *      knowing that the STA has gone to sleep.
1014          *
1015          * This is actually quite unlikely even when both those events are
1016          * processed from interrupts coming in quickly after one another or
1017          * even at the same time because we queue both TX status events and
1018          * RX frames to be processed by a tasklet and process them in the
1019          * same order that they were received or TX status last. Hence, there
1020          * is no race as long as the frame RX is processed before the next TX
1021          * status, which drivers can ensure, see below.
1022          *
1023          * Note that this can only happen if the hardware or firmware can
1024          * actually add STAs to the filter list, if this is done by the
1025          * driver in response to set_tim() (which will only reduce the race
1026          * this whole filtering tries to solve, not completely solve it)
1027          * this situation cannot happen.
1028          *
1029          * To completely solve this race drivers need to make sure that they
1030          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
1031          *      functions and
1032          *  (b) always process RX events before TX status events if ordering
1033          *      can be unknown, for example with different interrupt status
1034          *      bits.
1035          */
1036         if (test_sta_flags(sta, WLAN_STA_PS) &&
1037             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
1038                 ieee80211_remove_tx_extra(local, sta->key, skb);
1039                 skb_queue_tail(&sta->tx_filtered, skb);
1040                 return;
1041         }
1042
1043         if (!test_sta_flags(sta, WLAN_STA_PS) &&
1044             !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
1045                 /* Software retry the packet once */
1046                 info->flags |= IEEE80211_TX_CTL_REQUEUE;
1047                 ieee80211_remove_tx_extra(local, sta->key, skb);
1048                 dev_queue_xmit(skb);
1049                 return;
1050         }
1051
1052 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1053         if (net_ratelimit())
1054                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
1055                        "queue_len=%d PS=%d @%lu\n",
1056                        wiphy_name(local->hw.wiphy),
1057                        skb_queue_len(&sta->tx_filtered),
1058                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
1059 #endif
1060         dev_kfree_skb(skb);
1061 }
1062
1063 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1064 {
1065         struct sk_buff *skb2;
1066         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1067         struct ieee80211_local *local = hw_to_local(hw);
1068         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1069         u16 frag, type;
1070         __le16 fc;
1071         struct ieee80211_tx_status_rtap_hdr *rthdr;
1072         struct ieee80211_sub_if_data *sdata;
1073         struct net_device *prev_dev = NULL;
1074         struct sta_info *sta;
1075
1076         rcu_read_lock();
1077
1078         if (info->status.excessive_retries) {
1079                 sta = sta_info_get(local, hdr->addr1);
1080                 if (sta) {
1081                         if (test_sta_flags(sta, WLAN_STA_PS)) {
1082                                 /*
1083                                  * The STA is in power save mode, so assume
1084                                  * that this TX packet failed because of that.
1085                                  */
1086                                 ieee80211_handle_filtered_frame(local, sta, skb);
1087                                 rcu_read_unlock();
1088                                 return;
1089                         }
1090                 }
1091         }
1092
1093         fc = hdr->frame_control;
1094
1095         if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
1096             (ieee80211_is_data_qos(fc))) {
1097                 u16 tid, ssn;
1098                 u8 *qc;
1099                 sta = sta_info_get(local, hdr->addr1);
1100                 if (sta) {
1101                         qc = ieee80211_get_qos_ctl(hdr);
1102                         tid = qc[0] & 0xf;
1103                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
1104                                                 & IEEE80211_SCTL_SEQ);
1105                         ieee80211_send_bar(sta->sdata, hdr->addr1,
1106                                            tid, ssn);
1107                 }
1108         }
1109
1110         if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
1111                 sta = sta_info_get(local, hdr->addr1);
1112                 if (sta) {
1113                         ieee80211_handle_filtered_frame(local, sta, skb);
1114                         rcu_read_unlock();
1115                         return;
1116                 }
1117         } else
1118                 rate_control_tx_status(local->mdev, skb);
1119
1120         rcu_read_unlock();
1121
1122         ieee80211_led_tx(local, 0);
1123
1124         /* SNMP counters
1125          * Fragments are passed to low-level drivers as separate skbs, so these
1126          * are actually fragments, not frames. Update frame counters only for
1127          * the first fragment of the frame. */
1128
1129         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
1130         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
1131
1132         if (info->flags & IEEE80211_TX_STAT_ACK) {
1133                 if (frag == 0) {
1134                         local->dot11TransmittedFrameCount++;
1135                         if (is_multicast_ether_addr(hdr->addr1))
1136                                 local->dot11MulticastTransmittedFrameCount++;
1137                         if (info->status.retry_count > 0)
1138                                 local->dot11RetryCount++;
1139                         if (info->status.retry_count > 1)
1140                                 local->dot11MultipleRetryCount++;
1141                 }
1142
1143                 /* This counter shall be incremented for an acknowledged MPDU
1144                  * with an individual address in the address 1 field or an MPDU
1145                  * with a multicast address in the address 1 field of type Data
1146                  * or Management. */
1147                 if (!is_multicast_ether_addr(hdr->addr1) ||
1148                     type == IEEE80211_FTYPE_DATA ||
1149                     type == IEEE80211_FTYPE_MGMT)
1150                         local->dot11TransmittedFragmentCount++;
1151         } else {
1152                 if (frag == 0)
1153                         local->dot11FailedCount++;
1154         }
1155
1156         /* this was a transmitted frame, but now we want to reuse it */
1157         skb_orphan(skb);
1158
1159         /*
1160          * This is a bit racy but we can avoid a lot of work
1161          * with this test...
1162          */
1163         if (!local->monitors && !local->cooked_mntrs) {
1164                 dev_kfree_skb(skb);
1165                 return;
1166         }
1167
1168         /* send frame to monitor interfaces now */
1169
1170         if (skb_headroom(skb) < sizeof(*rthdr)) {
1171                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
1172                 dev_kfree_skb(skb);
1173                 return;
1174         }
1175
1176         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
1177                                 skb_push(skb, sizeof(*rthdr));
1178
1179         memset(rthdr, 0, sizeof(*rthdr));
1180         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1181         rthdr->hdr.it_present =
1182                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
1183                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
1184
1185         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
1186             !is_multicast_ether_addr(hdr->addr1))
1187                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
1188
1189         if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
1190             (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
1191                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
1192         else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
1193                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
1194
1195         rthdr->data_retries = info->status.retry_count;
1196
1197         /* XXX: is this sufficient for BPF? */
1198         skb_set_mac_header(skb, 0);
1199         skb->ip_summed = CHECKSUM_UNNECESSARY;
1200         skb->pkt_type = PACKET_OTHERHOST;
1201         skb->protocol = htons(ETH_P_802_2);
1202         memset(skb->cb, 0, sizeof(skb->cb));
1203
1204         rcu_read_lock();
1205         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1206                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR) {
1207                         if (!netif_running(sdata->dev))
1208                                 continue;
1209
1210                         if (prev_dev) {
1211                                 skb2 = skb_clone(skb, GFP_ATOMIC);
1212                                 if (skb2) {
1213                                         skb2->dev = prev_dev;
1214                                         netif_rx(skb2);
1215                                 }
1216                         }
1217
1218                         prev_dev = sdata->dev;
1219                 }
1220         }
1221         if (prev_dev) {
1222                 skb->dev = prev_dev;
1223                 netif_rx(skb);
1224                 skb = NULL;
1225         }
1226         rcu_read_unlock();
1227         dev_kfree_skb(skb);
1228 }
1229 EXPORT_SYMBOL(ieee80211_tx_status);
1230
1231 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1232                                         const struct ieee80211_ops *ops)
1233 {
1234         struct ieee80211_local *local;
1235         int priv_size;
1236         struct wiphy *wiphy;
1237
1238         /* Ensure 32-byte alignment of our private data and hw private data.
1239          * We use the wiphy priv data for both our ieee80211_local and for
1240          * the driver's private data
1241          *
1242          * In memory it'll be like this:
1243          *
1244          * +-------------------------+
1245          * | struct wiphy           |
1246          * +-------------------------+
1247          * | struct ieee80211_local  |
1248          * +-------------------------+
1249          * | driver's private data   |
1250          * +-------------------------+
1251          *
1252          */
1253         priv_size = ((sizeof(struct ieee80211_local) +
1254                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
1255                     priv_data_len;
1256
1257         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
1258
1259         if (!wiphy)
1260                 return NULL;
1261
1262         wiphy->privid = mac80211_wiphy_privid;
1263
1264         local = wiphy_priv(wiphy);
1265         local->hw.wiphy = wiphy;
1266
1267         local->hw.priv = (char *)local +
1268                          ((sizeof(struct ieee80211_local) +
1269                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
1270
1271         BUG_ON(!ops->tx);
1272         BUG_ON(!ops->start);
1273         BUG_ON(!ops->stop);
1274         BUG_ON(!ops->config);
1275         BUG_ON(!ops->add_interface);
1276         BUG_ON(!ops->remove_interface);
1277         BUG_ON(!ops->configure_filter);
1278         local->ops = ops;
1279
1280         local->hw.queues = 1; /* default */
1281
1282         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
1283         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1284         local->short_retry_limit = 7;
1285         local->long_retry_limit = 4;
1286         local->hw.conf.radio_enabled = 1;
1287
1288         INIT_LIST_HEAD(&local->interfaces);
1289
1290         spin_lock_init(&local->key_lock);
1291
1292         INIT_DELAYED_WORK(&local->scan_work, ieee80211_scan_work);
1293
1294         sta_info_init(local);
1295
1296         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1297                      (unsigned long)local);
1298         tasklet_disable(&local->tx_pending_tasklet);
1299
1300         tasklet_init(&local->tasklet,
1301                      ieee80211_tasklet_handler,
1302                      (unsigned long) local);
1303         tasklet_disable(&local->tasklet);
1304
1305         skb_queue_head_init(&local->skb_queue);
1306         skb_queue_head_init(&local->skb_queue_unreliable);
1307
1308         return local_to_hw(local);
1309 }
1310 EXPORT_SYMBOL(ieee80211_alloc_hw);
1311
1312 int ieee80211_register_hw(struct ieee80211_hw *hw)
1313 {
1314         struct ieee80211_local *local = hw_to_local(hw);
1315         const char *name;
1316         int result;
1317         enum ieee80211_band band;
1318         struct net_device *mdev;
1319         struct wireless_dev *mwdev;
1320
1321         /*
1322          * generic code guarantees at least one band,
1323          * set this very early because much code assumes
1324          * that hw.conf.channel is assigned
1325          */
1326         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1327                 struct ieee80211_supported_band *sband;
1328
1329                 sband = local->hw.wiphy->bands[band];
1330                 if (sband) {
1331                         /* init channel we're on */
1332                         local->hw.conf.channel =
1333                         local->oper_channel =
1334                         local->scan_channel = &sband->channels[0];
1335                         break;
1336                 }
1337         }
1338
1339         /* if low-level driver supports AP, we also support VLAN */
1340         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
1341                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
1342
1343         /* mac80211 always supports monitor */
1344         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
1345
1346         result = wiphy_register(local->hw.wiphy);
1347         if (result < 0)
1348                 return result;
1349
1350         /*
1351          * We use the number of queues for feature tests (QoS, HT) internally
1352          * so restrict them appropriately.
1353          */
1354         if (hw->queues > IEEE80211_MAX_QUEUES)
1355                 hw->queues = IEEE80211_MAX_QUEUES;
1356         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
1357                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
1358         if (hw->queues < 4)
1359                 hw->ampdu_queues = 0;
1360
1361         mdev = alloc_netdev_mq(sizeof(struct wireless_dev),
1362                                "wmaster%d", ether_setup,
1363                                ieee80211_num_queues(hw));
1364         if (!mdev)
1365                 goto fail_mdev_alloc;
1366
1367         mwdev = netdev_priv(mdev);
1368         mdev->ieee80211_ptr = mwdev;
1369         mwdev->wiphy = local->hw.wiphy;
1370
1371         local->mdev = mdev;
1372
1373         ieee80211_rx_bss_list_init(local);
1374
1375         mdev->hard_start_xmit = ieee80211_master_start_xmit;
1376         mdev->open = ieee80211_master_open;
1377         mdev->stop = ieee80211_master_stop;
1378         mdev->type = ARPHRD_IEEE80211;
1379         mdev->header_ops = &ieee80211_header_ops;
1380         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
1381
1382         name = wiphy_dev(local->hw.wiphy)->driver->name;
1383         local->hw.workqueue = create_freezeable_workqueue(name);
1384         if (!local->hw.workqueue) {
1385                 result = -ENOMEM;
1386                 goto fail_workqueue;
1387         }
1388
1389         /*
1390          * The hardware needs headroom for sending the frame,
1391          * and we need some headroom for passing the frame to monitor
1392          * interfaces, but never both at the same time.
1393          */
1394         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1395                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
1396
1397         debugfs_hw_add(local);
1398
1399         if (local->hw.conf.beacon_int < 10)
1400                 local->hw.conf.beacon_int = 100;
1401
1402         if (local->hw.max_listen_interval == 0)
1403                 local->hw.max_listen_interval = 1;
1404
1405         local->hw.conf.listen_interval = local->hw.max_listen_interval;
1406
1407         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
1408                                                   IEEE80211_HW_SIGNAL_DB |
1409                                                   IEEE80211_HW_SIGNAL_DBM) ?
1410                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1411         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
1412                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1413         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
1414                 local->wstats_flags |= IW_QUAL_DBM;
1415
1416         result = sta_info_start(local);
1417         if (result < 0)
1418                 goto fail_sta_info;
1419
1420         rtnl_lock();
1421         result = dev_alloc_name(local->mdev, local->mdev->name);
1422         if (result < 0)
1423                 goto fail_dev;
1424
1425         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1426         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1427
1428         result = register_netdevice(local->mdev);
1429         if (result < 0)
1430                 goto fail_dev;
1431
1432         result = ieee80211_init_rate_ctrl_alg(local,
1433                                               hw->rate_control_algorithm);
1434         if (result < 0) {
1435                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1436                        "algorithm\n", wiphy_name(local->hw.wiphy));
1437                 goto fail_rate;
1438         }
1439
1440         result = ieee80211_wep_init(local);
1441
1442         if (result < 0) {
1443                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
1444                        wiphy_name(local->hw.wiphy), result);
1445                 goto fail_wep;
1446         }
1447
1448         local->mdev->select_queue = ieee80211_select_queue;
1449
1450         /* add one default STA interface */
1451         result = ieee80211_if_add(local, "wlan%d", NULL,
1452                                   NL80211_IFTYPE_STATION, NULL);
1453         if (result)
1454                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1455                        wiphy_name(local->hw.wiphy));
1456
1457         rtnl_unlock();
1458
1459         ieee80211_led_init(local);
1460
1461         return 0;
1462
1463 fail_wep:
1464         rate_control_deinitialize(local);
1465 fail_rate:
1466         unregister_netdevice(local->mdev);
1467         local->mdev = NULL;
1468 fail_dev:
1469         rtnl_unlock();
1470         sta_info_stop(local);
1471 fail_sta_info:
1472         debugfs_hw_del(local);
1473         destroy_workqueue(local->hw.workqueue);
1474 fail_workqueue:
1475         if (local->mdev)
1476                 free_netdev(local->mdev);
1477 fail_mdev_alloc:
1478         wiphy_unregister(local->hw.wiphy);
1479         return result;
1480 }
1481 EXPORT_SYMBOL(ieee80211_register_hw);
1482
1483 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1484 {
1485         struct ieee80211_local *local = hw_to_local(hw);
1486
1487         tasklet_kill(&local->tx_pending_tasklet);
1488         tasklet_kill(&local->tasklet);
1489
1490         rtnl_lock();
1491
1492         /*
1493          * At this point, interface list manipulations are fine
1494          * because the driver cannot be handing us frames any
1495          * more and the tasklet is killed.
1496          */
1497
1498         /* First, we remove all virtual interfaces. */
1499         ieee80211_remove_interfaces(local);
1500
1501         /* then, finally, remove the master interface */
1502         unregister_netdevice(local->mdev);
1503
1504         rtnl_unlock();
1505
1506         ieee80211_rx_bss_list_deinit(local);
1507         ieee80211_clear_tx_pending(local);
1508         sta_info_stop(local);
1509         rate_control_deinitialize(local);
1510         debugfs_hw_del(local);
1511
1512         if (skb_queue_len(&local->skb_queue)
1513                         || skb_queue_len(&local->skb_queue_unreliable))
1514                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1515                        wiphy_name(local->hw.wiphy));
1516         skb_queue_purge(&local->skb_queue);
1517         skb_queue_purge(&local->skb_queue_unreliable);
1518
1519         destroy_workqueue(local->hw.workqueue);
1520         wiphy_unregister(local->hw.wiphy);
1521         ieee80211_wep_free(local);
1522         ieee80211_led_exit(local);
1523         free_netdev(local->mdev);
1524 }
1525 EXPORT_SYMBOL(ieee80211_unregister_hw);
1526
1527 void ieee80211_free_hw(struct ieee80211_hw *hw)
1528 {
1529         struct ieee80211_local *local = hw_to_local(hw);
1530
1531         wiphy_free(local->hw.wiphy);
1532 }
1533 EXPORT_SYMBOL(ieee80211_free_hw);
1534
1535 static int __init ieee80211_init(void)
1536 {
1537         struct sk_buff *skb;
1538         int ret;
1539
1540         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1541         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1542                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1543
1544         ret = rc80211_pid_init();
1545         if (ret)
1546                 return ret;
1547
1548         ieee80211_debugfs_netdev_init();
1549
1550         return 0;
1551 }
1552
1553 static void __exit ieee80211_exit(void)
1554 {
1555         rc80211_pid_exit();
1556
1557         /*
1558          * For key todo, it'll be empty by now but the work
1559          * might still be scheduled.
1560          */
1561         flush_scheduled_work();
1562
1563         if (mesh_allocated)
1564                 ieee80211s_stop();
1565
1566         ieee80211_debugfs_netdev_exit();
1567 }
1568
1569
1570 subsys_initcall(ieee80211_init);
1571 module_exit(ieee80211_exit);
1572
1573 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1574 MODULE_LICENSE("GPL");