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                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 256                         break;
 257                 /* mesh ifaces must set allmulti to forward mcast traffic */
 258                 atomic_inc(&local->iff_allmultis);
 259                 break;
 260         case IEEE80211_IF_TYPE_STA:
 261         case IEEE80211_IF_TYPE_MNTR:
 262         case IEEE80211_IF_TYPE_IBSS:
 263                 /* no special treatment */
 264                 break;
 265         case IEEE80211_IF_TYPE_INVALID:
 266                 /* cannot happen */
 267                 WARN_ON(1);
 268                 break;
 269         }
 270
 271         if (local->open_count == 0) {
 272                 res = 0;
 273                 if (local->ops->start)
 274                         res = local->ops->start(local_to_hw(local));
 275                 if (res)
 276                         goto err_del_bss;
 277                 need_hw_reconfig = 1;
 278                 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
 279         }
 280
 281         /*
 282          * Check all interfaces and copy the hopefully now-present
 283          * MAC address to those that have the special null one.
 284          */
 285         list_for_each_entry(nsdata, &local->interfaces, list) {
 286                 struct net_device *ndev = nsdata->dev;
 287
 288                 /*
 289                  * No need to check netif_running since we do not allow
 290                  * it to start up with this invalid address.
 291                  */
 292                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
 293                         memcpy(ndev->dev_addr,
 294                                local->hw.wiphy->perm_addr,
 295                                ETH_ALEN);
 296         }
 297
 298         if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0)
 299                 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr,
 300                        ETH_ALEN);
 301
 302         /*
 303          * Validate the MAC address for this device.
 304          */
 305         if (!is_valid_ether_addr(dev->dev_addr)) {
 306                 if (!local->open_count && local->ops->stop)
 307                         local->ops->stop(local_to_hw(local));
 308                 return -EADDRNOTAVAIL;
 309         }
 310
 311         switch (sdata->vif.type) {
 312         case IEEE80211_IF_TYPE_VLAN:
 313                 /* no need to tell driver */
 314                 break;
 315         case IEEE80211_IF_TYPE_MNTR:
 316                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 317                         local->cooked_mntrs++;
 318                         break;
 319                 }
 320
 321                 /* must be before the call to ieee80211_configure_filter */
 322                 local->monitors++;
 323                 if (local->monitors == 1)
 324                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 325
 326                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 327                         local->fif_fcsfail++;
 328                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 329                         local->fif_plcpfail++;
 330                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 331                         local->fif_control++;
 332                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 333                         local->fif_other_bss++;
 334
 335                 netif_addr_lock_bh(local->mdev);
 336                 ieee80211_configure_filter(local);
 337                 netif_addr_unlock_bh(local->mdev);
 338                 break;
 339         case IEEE80211_IF_TYPE_STA:
 340         case IEEE80211_IF_TYPE_IBSS:
 341                 sdata->u.sta.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
 342                 /* fall through */
 343         default:
 344                 conf.vif = &sdata->vif;
 345                 conf.type = sdata->vif.type;
 346                 conf.mac_addr = dev->dev_addr;
 347                 res = local->ops->add_interface(local_to_hw(local), &conf);
 348                 if (res)
 349                         goto err_stop;
 350
 351                 if (ieee80211_vif_is_mesh(&sdata->vif))
 352                         ieee80211_start_mesh(sdata);
 353                 changed |= ieee80211_reset_erp_info(sdata);
 354                 ieee80211_bss_info_change_notify(sdata, changed);
 355                 ieee80211_enable_keys(sdata);
 356
 357                 if (sdata->vif.type == IEEE80211_IF_TYPE_STA &&
 358                     !(sdata->flags & IEEE80211_SDATA_USERSPACE_MLME))
 359                         netif_carrier_off(dev);
 360                 else
 361                         netif_carrier_on(dev);
 362         }
 363
 364         if (sdata->vif.type == IEEE80211_IF_TYPE_WDS) {
 365                 /* Create STA entry for the WDS peer */
 366                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 367                                      GFP_KERNEL);
 368                 if (!sta) {
 369                         res = -ENOMEM;
 370                         goto err_del_interface;
 371                 }
 372
 373                 /* no locking required since STA is not live yet */
 374                 sta->flags |= WLAN_STA_AUTHORIZED;
 375
 376                 res = sta_info_insert(sta);
 377                 if (res) {
 378                         /* STA has been freed */
 379                         goto err_del_interface;
 380                 }
 381         }
 382
 383         if (local->open_count == 0) {
 384                 res = dev_open(local->mdev);
 385                 WARN_ON(res);
 386                 if (res)
 387                         goto err_del_interface;
 388                 tasklet_enable(&local->tx_pending_tasklet);
 389                 tasklet_enable(&local->tasklet);
 390         }
 391
 392         /*
 393          * set_multicast_list will be invoked by the networking core
 394          * which will check whether any increments here were done in
 395          * error and sync them down to the hardware as filter flags.
 396          */
 397         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 398                 atomic_inc(&local->iff_allmultis);
 399
 400         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 401                 atomic_inc(&local->iff_promiscs);
 402
 403         local->open_count++;
 404         if (need_hw_reconfig) {
 405                 ieee80211_hw_config(local);
 406                 /*
 407                  * set default queue parameters so drivers don't
 408                  * need to initialise the hardware if the hardware
 409                  * doesn't start up with sane defaults
 410                  */
 411                 ieee80211_set_wmm_default(sdata);
 412         }
 413
 414         /*
 415          * ieee80211_sta_work is disabled while network interface
 416          * is down. Therefore, some configuration changes may not
 417          * yet be effective. Trigger execution of ieee80211_sta_work
 418          * to fix this.
 419          */
 420         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
 421             sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
 422                 struct ieee80211_if_sta *ifsta = &sdata->u.sta;
 423                 queue_work(local->hw.workqueue, &ifsta->work);
 424         }
 425
 426         netif_tx_start_all_queues(dev);
 427
 428         return 0;
 429  err_del_interface:
 430         local->ops->remove_interface(local_to_hw(local), &conf);
 431  err_stop:
 432         if (!local->open_count && local->ops->stop)
 433                 local->ops->stop(local_to_hw(local));
 434  err_del_bss:
 435         sdata->bss = NULL;
 436         if (sdata->vif.type == IEEE80211_IF_TYPE_VLAN)
 437                 list_del(&sdata->u.vlan.list);
 438         return res;
 439 }
 440
 441 static int ieee80211_stop(struct net_device *dev)
 442 {
 443         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 444         struct ieee80211_local *local = sdata->local;
 445         struct ieee80211_if_init_conf conf;
 446         struct sta_info *sta;
 447
 448         /*
 449          * Stop TX on this interface first.
 450          */
 451         netif_tx_stop_all_queues(dev);
 452
 453         /*
 454          * Now delete all active aggregation sessions.
 455          */
 456         rcu_read_lock();
 457
 458         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 459                 if (sta->sdata == sdata)
 460                         ieee80211_sta_tear_down_BA_sessions(sdata, sta->addr);
 461         }
 462
 463         rcu_read_unlock();
 464
 465         /*
 466          * Remove all stations associated with this interface.
 467          *
 468          * This must be done before calling ops->remove_interface()
 469          * because otherwise we can later invoke ops->sta_notify()
 470          * whenever the STAs are removed, and that invalidates driver
 471          * assumptions about always getting a vif pointer that is valid
 472          * (because if we remove a STA after ops->remove_interface()
 473          * the driver will have removed the vif info already!)
 474          *
 475          * We could relax this and only unlink the stations from the
 476          * hash table and list but keep them on a per-sdata list that
 477          * will be inserted back again when the interface is brought
 478          * up again, but I don't currently see a use case for that,
 479          * except with WDS which gets a STA entry created when it is
 480          * brought up.
 481          */
 482         sta_info_flush(local, sdata);
 483
 484         /*
 485          * Don't count this interface for promisc/allmulti while it
 486          * is down. dev_mc_unsync() will invoke set_multicast_list
 487          * on the master interface which will sync these down to the
 488          * hardware as filter flags.
 489          */
 490         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 491                 atomic_dec(&local->iff_allmultis);
 492
 493         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 494                 atomic_dec(&local->iff_promiscs);
 495
 496         dev_mc_unsync(local->mdev, dev);
 497
 498         /* APs need special treatment */
 499         if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
 500                 struct ieee80211_sub_if_data *vlan, *tmp;
 501                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 502
 503                 /* remove beacon */
 504                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 505                 synchronize_rcu();
 506                 kfree(old_beacon);
 507
 508                 /* down all dependent devices, that is VLANs */
 509                 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
 510                                          u.vlan.list)
 511                         dev_close(vlan->dev);
 512                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 513         }
 514
 515         local->open_count--;
 516
 517         switch (sdata->vif.type) {
 518         case IEEE80211_IF_TYPE_VLAN:
 519                 list_del(&sdata->u.vlan.list);
 520                 /* no need to tell driver */
 521                 break;
 522         case IEEE80211_IF_TYPE_MNTR:
 523                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 524                         local->cooked_mntrs--;
 525                         break;
 526                 }
 527
 528                 local->monitors--;
 529                 if (local->monitors == 0)
 530                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
 531
 532                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 533                         local->fif_fcsfail--;
 534                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 535                         local->fif_plcpfail--;
 536                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 537                         local->fif_control--;
 538                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 539                         local->fif_other_bss--;
 540
 541                 netif_addr_lock_bh(local->mdev);
 542                 ieee80211_configure_filter(local);
 543                 netif_addr_unlock_bh(local->mdev);
 544                 break;
 545         case IEEE80211_IF_TYPE_STA:
 546         case IEEE80211_IF_TYPE_IBSS:
 547                 sdata->u.sta.state = IEEE80211_STA_MLME_DISABLED;
 548                 memset(sdata->u.sta.bssid, 0, ETH_ALEN);
 549                 del_timer_sync(&sdata->u.sta.timer);
 550                 /*
 551                  * When we get here, the interface is marked down.
 552                  * Call synchronize_rcu() to wait for the RX path
 553                  * should it be using the interface and enqueuing
 554                  * frames at this very time on another CPU.
 555                  */
 556                 synchronize_rcu();
 557                 skb_queue_purge(&sdata->u.sta.skb_queue);
 558
 559                 if (local->scan_sdata == sdata) {
 560                         if (!local->ops->hw_scan) {
 561                                 local->sta_sw_scanning = 0;
 562                                 cancel_delayed_work(&local->scan_work);
 563                         } else
 564                                 local->sta_hw_scanning = 0;
 565                 }
 566
 567                 sdata->u.sta.flags &= ~IEEE80211_STA_PRIVACY_INVOKED;
 568                 kfree(sdata->u.sta.extra_ie);
 569                 sdata->u.sta.extra_ie = NULL;
 570                 sdata->u.sta.extra_ie_len = 0;
 571                 /* fall through */
 572         case IEEE80211_IF_TYPE_MESH_POINT:
 573                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 574                         /* allmulti is always set on mesh ifaces */
 575                         atomic_dec(&local->iff_allmultis);
 576                         ieee80211_stop_mesh(sdata);
 577                 }
 578                 /* fall through */
 579         default:
 580                 conf.vif = &sdata->vif;
 581                 conf.type = sdata->vif.type;
 582                 conf.mac_addr = dev->dev_addr;
 583                 /* disable all keys for as long as this netdev is down */
 584                 ieee80211_disable_keys(sdata);
 585                 local->ops->remove_interface(local_to_hw(local), &conf);
 586         }
 587
 588         sdata->bss = NULL;
 589
 590         if (local->open_count == 0) {
 591                 if (netif_running(local->mdev))
 592                         dev_close(local->mdev);
 593
 594                 if (local->ops->stop)
 595                         local->ops->stop(local_to_hw(local));
 596
 597                 ieee80211_led_radio(local, 0);
 598
 599                 flush_workqueue(local->hw.workqueue);
 600
 601                 tasklet_disable(&local->tx_pending_tasklet);
 602                 tasklet_disable(&local->tasklet);
 603         }
 604
 605         return 0;
 606 }
 607
 608 static void ieee80211_set_multicast_list(struct net_device *dev)
 609 {
 610         struct ieee80211_local *local = wdev_priv(dev->ieee80211_ptr);
 611         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 612         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 613
 614         allmulti = !!(dev->flags & IFF_ALLMULTI);
 615         promisc = !!(dev->flags & IFF_PROMISC);
 616         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 617         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 618
 619         if (allmulti != sdata_allmulti) {
 620                 if (dev->flags & IFF_ALLMULTI)
 621                         atomic_inc(&local->iff_allmultis);
 622                 else
 623                         atomic_dec(&local->iff_allmultis);
 624                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 625         }
 626
 627         if (promisc != sdata_promisc) {
 628                 if (dev->flags & IFF_PROMISC)
 629                         atomic_inc(&local->iff_promiscs);
 630                 else
 631                         atomic_dec(&local->iff_promiscs);
 632                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 633         }
 634
 635         dev_mc_sync(local->mdev, dev);
 636 }
 637
 638 static const struct header_ops ieee80211_header_ops = {
 639         .create         = eth_header,
 640         .parse          = header_parse_80211,
 641         .rebuild        = eth_rebuild_header,
 642         .cache          = eth_header_cache,
 643         .cache_update   = eth_header_cache_update,
 644 };
 645
 646 void ieee80211_if_setup(struct net_device *dev)
 647 {
 648         ether_setup(dev);
 649         dev->hard_start_xmit = ieee80211_subif_start_xmit;
 650         dev->wireless_handlers = &ieee80211_iw_handler_def;
 651         dev->set_multicast_list = ieee80211_set_multicast_list;
 652         dev->change_mtu = ieee80211_change_mtu;
 653         dev->open = ieee80211_open;
 654         dev->stop = ieee80211_stop;
 655         dev->destructor = free_netdev;
 656         /* we will validate the address ourselves in ->open */
 657         dev->validate_addr = NULL;
 658 }
 659
 660 /* everything else */
 661
 662 int ieee80211_if_config(struct ieee80211_sub_if_data *sdata, u32 changed)
 663 {
 664         struct ieee80211_local *local = sdata->local;
 665         struct ieee80211_if_conf conf;
 666
 667         if (WARN_ON(!netif_running(sdata->dev)))
 668                 return 0;
 669
 670         if (!local->ops->config_interface)
 671                 return 0;
 672
 673         memset(&conf, 0, sizeof(conf));
 674         conf.changed = changed;
 675
 676         if (sdata->vif.type == IEEE80211_IF_TYPE_STA ||
 677             sdata->vif.type == IEEE80211_IF_TYPE_IBSS) {
 678                 conf.bssid = sdata->u.sta.bssid;
 679                 conf.ssid = sdata->u.sta.ssid;
 680                 conf.ssid_len = sdata->u.sta.ssid_len;
 681         } else if (sdata->vif.type == IEEE80211_IF_TYPE_AP) {
 682                 conf.bssid = sdata->dev->dev_addr;
 683                 conf.ssid = sdata->u.ap.ssid;
 684                 conf.ssid_len = sdata->u.ap.ssid_len;
 685         } else if (ieee80211_vif_is_mesh(&sdata->vif)) {
 686                 u8 zero[ETH_ALEN] = { 0 };
 687                 conf.bssid = zero;
 688                 conf.ssid = zero;
 689                 conf.ssid_len = 0;
 690         } else {
 691                 WARN_ON(1);
 692                 return -EINVAL;
 693         }
 694
 695         if (WARN_ON(!conf.bssid && (changed & IEEE80211_IFCC_BSSID)))
 696                 return -EINVAL;
 697
 698         if (WARN_ON(!conf.ssid && (changed & IEEE80211_IFCC_SSID)))
 699                 return -EINVAL;
 700
 701         return local->ops->config_interface(local_to_hw(local),
 702                                             &sdata->vif, &conf);
 703 }
 704
 705 int ieee80211_hw_config(struct ieee80211_local *local)
 706 {
 707         struct ieee80211_channel *chan;
 708         int ret = 0;
 709
 710         if (local->sta_sw_scanning)
 711                 chan = local->scan_channel;
 712         else
 713                 chan = local->oper_channel;
 714
 715         local->hw.conf.channel = chan;
 716
 717         if (!local->hw.conf.power_level)
 718                 local->hw.conf.power_level = chan->max_power;
 719         else
 720                 local->hw.conf.power_level = min(chan->max_power,
 721                                                local->hw.conf.power_level);
 722
 723         local->hw.conf.max_antenna_gain = chan->max_antenna_gain;
 724
 725 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
 726         printk(KERN_DEBUG "%s: HW CONFIG: freq=%d\n",
 727                wiphy_name(local->hw.wiphy), chan->center_freq);
 728 #endif
 729
 730         if (local->open_count)
 731                 ret = local->ops->config(local_to_hw(local), &local->hw.conf);
 732
 733         return ret;
 734 }
 735
 736 /**
 737  * ieee80211_handle_ht should be used only after legacy configuration
 738  * has been determined namely band, as ht configuration depends upon
 739  * the hardware's HT abilities for a _specific_ band.
 740  */
 741 u32 ieee80211_handle_ht(struct ieee80211_local *local, int enable_ht,
 742                            struct ieee80211_ht_info *req_ht_cap,
 743                            struct ieee80211_ht_bss_info *req_bss_cap)
 744 {
 745         struct ieee80211_conf *conf = &local->hw.conf;
 746         struct ieee80211_supported_band *sband;
 747         struct ieee80211_ht_info ht_conf;
 748         struct ieee80211_ht_bss_info ht_bss_conf;
 749         u32 changed = 0;
 750         int i;
 751         u8 max_tx_streams = IEEE80211_HT_CAP_MAX_STREAMS;
 752         u8 tx_mcs_set_cap;
 753
 754         sband = local->hw.wiphy->bands[conf->channel->band];
 755
 756         memset(&ht_conf, 0, sizeof(struct ieee80211_ht_info));
 757         memset(&ht_bss_conf, 0, sizeof(struct ieee80211_ht_bss_info));
 758
 759         /* HT is not supported */
 760         if (!sband->ht_info.ht_supported) {
 761                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
 762                 goto out;
 763         }
 764
 765         /* disable HT */
 766         if (!enable_ht) {
 767                 if (conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE)
 768                         changed |= BSS_CHANGED_HT;
 769                 conf->flags &= ~IEEE80211_CONF_SUPPORT_HT_MODE;
 770                 conf->ht_conf.ht_supported = 0;
 771                 goto out;
 772         }
 773
 774
 775         if (!(conf->flags & IEEE80211_CONF_SUPPORT_HT_MODE))
 776                 changed |= BSS_CHANGED_HT;
 777
 778         conf->flags |= IEEE80211_CONF_SUPPORT_HT_MODE;
 779         ht_conf.ht_supported = 1;
 780
 781         ht_conf.cap = req_ht_cap->cap & sband->ht_info.cap;
 782         ht_conf.cap &= ~(IEEE80211_HT_CAP_SM_PS);
 783         ht_conf.cap |= sband->ht_info.cap & IEEE80211_HT_CAP_SM_PS;
 784         ht_bss_conf.primary_channel = req_bss_cap->primary_channel;
 785         ht_bss_conf.bss_cap = req_bss_cap->bss_cap;
 786         ht_bss_conf.bss_op_mode = req_bss_cap->bss_op_mode;
 787
 788         ht_conf.ampdu_factor = req_ht_cap->ampdu_factor;
 789         ht_conf.ampdu_density = req_ht_cap->ampdu_density;
 790
 791         /* Bits 96-100 */
 792         tx_mcs_set_cap = sband->ht_info.supp_mcs_set[12];
 793
 794         /* configure suppoerted Tx MCS according to requested MCS
 795          * (based in most cases on Rx capabilities of peer) and self
 796          * Tx MCS capabilities (as defined by low level driver HW
 797          * Tx capabilities) */
 798         if (!(tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_DEFINED))
 799                 goto check_changed;
 800
 801         /* Counting from 0 therfore + 1 */
 802         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_RX_DIFF)
 803                 max_tx_streams = ((tx_mcs_set_cap &
 804                                 IEEE80211_HT_CAP_MCS_TX_STREAMS) >> 2) + 1;
 805
 806         for (i = 0; i < max_tx_streams; i++)
 807                 ht_conf.supp_mcs_set[i] =
 808                         sband->ht_info.supp_mcs_set[i] &
 809                                         req_ht_cap->supp_mcs_set[i];
 810
 811         if (tx_mcs_set_cap & IEEE80211_HT_CAP_MCS_TX_UEQM)
 812                 for (i = IEEE80211_SUPP_MCS_SET_UEQM;
 813                      i < IEEE80211_SUPP_MCS_SET_LEN; i++)
 814                         ht_conf.supp_mcs_set[i] =
 815                                 sband->ht_info.supp_mcs_set[i] &
 816                                         req_ht_cap->supp_mcs_set[i];
 817
 818 check_changed:
 819         /* if bss configuration changed store the new one */
 820         if (memcmp(&conf->ht_conf, &ht_conf, sizeof(ht_conf)) ||
 821             memcmp(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf))) {
 822                 changed |= BSS_CHANGED_HT;
 823                 memcpy(&conf->ht_conf, &ht_conf, sizeof(ht_conf));
 824                 memcpy(&conf->ht_bss_conf, &ht_bss_conf, sizeof(ht_bss_conf));
 825         }
 826 out:
 827         return changed;
 828 }
 829
 830 void ieee80211_bss_info_change_notify(struct ieee80211_sub_if_data *sdata,
 831                                       u32 changed)
 832 {
 833         struct ieee80211_local *local = sdata->local;
 834
 835         if (!changed)
 836                 return;
 837
 838         if (local->ops->bss_info_changed)
 839                 local->ops->bss_info_changed(local_to_hw(local),
 840                                              &sdata->vif,
 841                                              &sdata->bss_conf,
 842                                              changed);
 843 }
 844
 845 u32 ieee80211_reset_erp_info(struct ieee80211_sub_if_data *sdata)
 846 {
 847         sdata->bss_conf.use_cts_prot = 0;
 848         sdata->bss_conf.use_short_preamble = 0;
 849         return BSS_CHANGED_ERP_CTS_PROT | BSS_CHANGED_ERP_PREAMBLE;
 850 }
 851
 852 void ieee80211_tx_status_irqsafe(struct ieee80211_hw *hw,
 853                                  struct sk_buff *skb)
 854 {
 855         struct ieee80211_local *local = hw_to_local(hw);
 856         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 857         int tmp;
 858
 859         skb->dev = local->mdev;
 860         skb->pkt_type = IEEE80211_TX_STATUS_MSG;
 861         skb_queue_tail(info->flags & IEEE80211_TX_CTL_REQ_TX_STATUS ?
 862                        &local->skb_queue : &local->skb_queue_unreliable, skb);
 863         tmp = skb_queue_len(&local->skb_queue) +
 864                 skb_queue_len(&local->skb_queue_unreliable);
 865         while (tmp > IEEE80211_IRQSAFE_QUEUE_LIMIT &&
 866                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 867                 dev_kfree_skb_irq(skb);
 868                 tmp--;
 869                 I802_DEBUG_INC(local->tx_status_drop);
 870         }
 871         tasklet_schedule(&local->tasklet);
 872 }
 873 EXPORT_SYMBOL(ieee80211_tx_status_irqsafe);
 874
 875 static void ieee80211_tasklet_handler(unsigned long data)
 876 {
 877         struct ieee80211_local *local = (struct ieee80211_local *) data;
 878         struct sk_buff *skb;
 879         struct ieee80211_rx_status rx_status;
 880         struct ieee80211_ra_tid *ra_tid;
 881
 882         while ((skb = skb_dequeue(&local->skb_queue)) ||
 883                (skb = skb_dequeue(&local->skb_queue_unreliable))) {
 884                 switch (skb->pkt_type) {
 885                 case IEEE80211_RX_MSG:
 886                         /* status is in skb->cb */
 887                         memcpy(&rx_status, skb->cb, sizeof(rx_status));
 888                         /* Clear skb->pkt_type in order to not confuse kernel
 889                          * netstack. */
 890                         skb->pkt_type = 0;
 891                         __ieee80211_rx(local_to_hw(local), skb, &rx_status);
 892                         break;
 893                 case IEEE80211_TX_STATUS_MSG:
 894                         skb->pkt_type = 0;
 895                         ieee80211_tx_status(local_to_hw(local), skb);
 896                         break;
 897                 case IEEE80211_DELBA_MSG:
 898                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 899                         ieee80211_stop_tx_ba_cb(local_to_hw(local),
 900                                                 ra_tid->ra, ra_tid->tid);
 901                         dev_kfree_skb(skb);
 902                         break;
 903                 case IEEE80211_ADDBA_MSG:
 904                         ra_tid = (struct ieee80211_ra_tid *) &skb->cb;
 905                         ieee80211_start_tx_ba_cb(local_to_hw(local),
 906                                                  ra_tid->ra, ra_tid->tid);
 907                         dev_kfree_skb(skb);
 908                         break ;
 909                 default:
 910                         WARN_ON(1);
 911                         dev_kfree_skb(skb);
 912                         break;
 913                 }
 914         }
 915 }
 916
 917 /* Remove added headers (e.g., QoS control), encryption header/MIC, etc. to
 918  * make a prepared TX frame (one that has been given to hw) to look like brand
 919  * new IEEE 802.11 frame that is ready to go through TX processing again.
 920  */
 921 static void ieee80211_remove_tx_extra(struct ieee80211_local *local,
 922                                       struct ieee80211_key *key,
 923                                       struct sk_buff *skb)
 924 {
 925         unsigned int hdrlen, iv_len, mic_len;
 926         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
 927
 928         hdrlen = ieee80211_hdrlen(hdr->frame_control);
 929
 930         if (!key)
 931                 goto no_key;
 932
 933         switch (key->conf.alg) {
 934         case ALG_WEP:
 935                 iv_len = WEP_IV_LEN;
 936                 mic_len = WEP_ICV_LEN;
 937                 break;
 938         case ALG_TKIP:
 939                 iv_len = TKIP_IV_LEN;
 940                 mic_len = TKIP_ICV_LEN;
 941                 break;
 942         case ALG_CCMP:
 943                 iv_len = CCMP_HDR_LEN;
 944                 mic_len = CCMP_MIC_LEN;
 945                 break;
 946         default:
 947                 goto no_key;
 948         }
 949
 950         if (skb->len >= hdrlen + mic_len &&
 951             !(key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
 952                 skb_trim(skb, skb->len - mic_len);
 953         if (skb->len >= hdrlen + iv_len) {
 954                 memmove(skb->data + iv_len, skb->data, hdrlen);
 955                 hdr = (struct ieee80211_hdr *)skb_pull(skb, iv_len);
 956         }
 957
 958 no_key:
 959         if (ieee80211_is_data_qos(hdr->frame_control)) {
 960                 hdr->frame_control &= ~cpu_to_le16(IEEE80211_STYPE_QOS_DATA);
 961                 memmove(skb->data + IEEE80211_QOS_CTL_LEN, skb->data,
 962                         hdrlen - IEEE80211_QOS_CTL_LEN);
 963                 skb_pull(skb, IEEE80211_QOS_CTL_LEN);
 964         }
 965 }
 966
 967 static void ieee80211_handle_filtered_frame(struct ieee80211_local *local,
 968                                             struct sta_info *sta,
 969                                             struct sk_buff *skb)
 970 {
 971         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 972
 973         sta->tx_filtered_count++;
 974
 975         /*
 976          * Clear the TX filter mask for this STA when sending the next
 977          * packet. If the STA went to power save mode, this will happen
 978          * when it wakes up for the next time.
 979          */
 980         set_sta_flags(sta, WLAN_STA_CLEAR_PS_FILT);
 981
 982         /*
 983          * This code races in the following way:
 984          *
 985          *  (1) STA sends frame indicating it will go to sleep and does so
 986          *  (2) hardware/firmware adds STA to filter list, passes frame up
 987          *  (3) hardware/firmware processes TX fifo and suppresses a frame
 988          *  (4) we get TX status before having processed the frame and
 989          *      knowing that the STA has gone to sleep.
 990          *
 991          * This is actually quite unlikely even when both those events are
 992          * processed from interrupts coming in quickly after one another or
 993          * even at the same time because we queue both TX status events and
 994          * RX frames to be processed by a tasklet and process them in the
 995          * same order that they were received or TX status last. Hence, there
 996          * is no race as long as the frame RX is processed before the next TX
 997          * status, which drivers can ensure, see below.
 998          *
 999          * Note that this can only happen if the hardware or firmware can
1000          * actually add STAs to the filter list, if this is done by the
1001          * driver in response to set_tim() (which will only reduce the race
1002          * this whole filtering tries to solve, not completely solve it)
1003          * this situation cannot happen.
1004          *
1005          * To completely solve this race drivers need to make sure that they
1006          *  (a) don't mix the irq-safe/not irq-safe TX status/RX processing
1007          *      functions and
1008          *  (b) always process RX events before TX status events if ordering
1009          *      can be unknown, for example with different interrupt status
1010          *      bits.
1011          */
1012         if (test_sta_flags(sta, WLAN_STA_PS) &&
1013             skb_queue_len(&sta->tx_filtered) < STA_MAX_TX_BUFFER) {
1014                 ieee80211_remove_tx_extra(local, sta->key, skb);
1015                 skb_queue_tail(&sta->tx_filtered, skb);
1016                 return;
1017         }
1018
1019         if (!test_sta_flags(sta, WLAN_STA_PS) &&
1020             !(info->flags & IEEE80211_TX_CTL_REQUEUE)) {
1021                 /* Software retry the packet once */
1022                 info->flags |= IEEE80211_TX_CTL_REQUEUE;
1023                 ieee80211_remove_tx_extra(local, sta->key, skb);
1024                 dev_queue_xmit(skb);
1025                 return;
1026         }
1027
1028 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1029         if (net_ratelimit())
1030                 printk(KERN_DEBUG "%s: dropped TX filtered frame, "
1031                        "queue_len=%d PS=%d @%lu\n",
1032                        wiphy_name(local->hw.wiphy),
1033                        skb_queue_len(&sta->tx_filtered),
1034                        !!test_sta_flags(sta, WLAN_STA_PS), jiffies);
1035 #endif
1036         dev_kfree_skb(skb);
1037 }
1038
1039 void ieee80211_tx_status(struct ieee80211_hw *hw, struct sk_buff *skb)
1040 {
1041         struct sk_buff *skb2;
1042         struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
1043         struct ieee80211_local *local = hw_to_local(hw);
1044         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1045         u16 frag, type;
1046         __le16 fc;
1047         struct ieee80211_tx_status_rtap_hdr *rthdr;
1048         struct ieee80211_sub_if_data *sdata;
1049         struct net_device *prev_dev = NULL;
1050         struct sta_info *sta;
1051
1052         rcu_read_lock();
1053
1054         if (info->status.excessive_retries) {
1055                 sta = sta_info_get(local, hdr->addr1);
1056                 if (sta) {
1057                         if (test_sta_flags(sta, WLAN_STA_PS)) {
1058                                 /*
1059                                  * The STA is in power save mode, so assume
1060                                  * that this TX packet failed because of that.
1061                                  */
1062                                 ieee80211_handle_filtered_frame(local, sta, skb);
1063                                 rcu_read_unlock();
1064                                 return;
1065                         }
1066                 }
1067         }
1068
1069         fc = hdr->frame_control;
1070
1071         if ((info->flags & IEEE80211_TX_STAT_AMPDU_NO_BACK) &&
1072             (ieee80211_is_data_qos(fc))) {
1073                 u16 tid, ssn;
1074                 u8 *qc;
1075                 sta = sta_info_get(local, hdr->addr1);
1076                 if (sta) {
1077                         qc = ieee80211_get_qos_ctl(hdr);
1078                         tid = qc[0] & 0xf;
1079                         ssn = ((le16_to_cpu(hdr->seq_ctrl) + 0x10)
1080                                                 & IEEE80211_SCTL_SEQ);
1081                         ieee80211_send_bar(sta->sdata, hdr->addr1,
1082                                            tid, ssn);
1083                 }
1084         }
1085
1086         if (info->flags & IEEE80211_TX_STAT_TX_FILTERED) {
1087                 sta = sta_info_get(local, hdr->addr1);
1088                 if (sta) {
1089                         ieee80211_handle_filtered_frame(local, sta, skb);
1090                         rcu_read_unlock();
1091                         return;
1092                 }
1093         } else
1094                 rate_control_tx_status(local->mdev, skb);
1095
1096         rcu_read_unlock();
1097
1098         ieee80211_led_tx(local, 0);
1099
1100         /* SNMP counters
1101          * Fragments are passed to low-level drivers as separate skbs, so these
1102          * are actually fragments, not frames. Update frame counters only for
1103          * the first fragment of the frame. */
1104
1105         frag = le16_to_cpu(hdr->seq_ctrl) & IEEE80211_SCTL_FRAG;
1106         type = le16_to_cpu(hdr->frame_control) & IEEE80211_FCTL_FTYPE;
1107
1108         if (info->flags & IEEE80211_TX_STAT_ACK) {
1109                 if (frag == 0) {
1110                         local->dot11TransmittedFrameCount++;
1111                         if (is_multicast_ether_addr(hdr->addr1))
1112                                 local->dot11MulticastTransmittedFrameCount++;
1113                         if (info->status.retry_count > 0)
1114                                 local->dot11RetryCount++;
1115                         if (info->status.retry_count > 1)
1116                                 local->dot11MultipleRetryCount++;
1117                 }
1118
1119                 /* This counter shall be incremented for an acknowledged MPDU
1120                  * with an individual address in the address 1 field or an MPDU
1121                  * with a multicast address in the address 1 field of type Data
1122                  * or Management. */
1123                 if (!is_multicast_ether_addr(hdr->addr1) ||
1124                     type == IEEE80211_FTYPE_DATA ||
1125                     type == IEEE80211_FTYPE_MGMT)
1126                         local->dot11TransmittedFragmentCount++;
1127         } else {
1128                 if (frag == 0)
1129                         local->dot11FailedCount++;
1130         }
1131
1132         /* this was a transmitted frame, but now we want to reuse it */
1133         skb_orphan(skb);
1134
1135         /*
1136          * This is a bit racy but we can avoid a lot of work
1137          * with this test...
1138          */
1139         if (!local->monitors && !local->cooked_mntrs) {
1140                 dev_kfree_skb(skb);
1141                 return;
1142         }
1143
1144         /* send frame to monitor interfaces now */
1145
1146         if (skb_headroom(skb) < sizeof(*rthdr)) {
1147                 printk(KERN_ERR "ieee80211_tx_status: headroom too small\n");
1148                 dev_kfree_skb(skb);
1149                 return;
1150         }
1151
1152         rthdr = (struct ieee80211_tx_status_rtap_hdr *)
1153                                 skb_push(skb, sizeof(*rthdr));
1154
1155         memset(rthdr, 0, sizeof(*rthdr));
1156         rthdr->hdr.it_len = cpu_to_le16(sizeof(*rthdr));
1157         rthdr->hdr.it_present =
1158                 cpu_to_le32((1 << IEEE80211_RADIOTAP_TX_FLAGS) |
1159                             (1 << IEEE80211_RADIOTAP_DATA_RETRIES));
1160
1161         if (!(info->flags & IEEE80211_TX_STAT_ACK) &&
1162             !is_multicast_ether_addr(hdr->addr1))
1163                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_FAIL);
1164
1165         if ((info->flags & IEEE80211_TX_CTL_USE_RTS_CTS) &&
1166             (info->flags & IEEE80211_TX_CTL_USE_CTS_PROTECT))
1167                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_CTS);
1168         else if (info->flags & IEEE80211_TX_CTL_USE_RTS_CTS)
1169                 rthdr->tx_flags |= cpu_to_le16(IEEE80211_RADIOTAP_F_TX_RTS);
1170
1171         rthdr->data_retries = info->status.retry_count;
1172
1173         /* XXX: is this sufficient for BPF? */
1174         skb_set_mac_header(skb, 0);
1175         skb->ip_summed = CHECKSUM_UNNECESSARY;
1176         skb->pkt_type = PACKET_OTHERHOST;
1177         skb->protocol = htons(ETH_P_802_2);
1178         memset(skb->cb, 0, sizeof(skb->cb));
1179
1180         rcu_read_lock();
1181         list_for_each_entry_rcu(sdata, &local->interfaces, list) {
1182                 if (sdata->vif.type == IEEE80211_IF_TYPE_MNTR) {
1183                         if (!netif_running(sdata->dev))
1184                                 continue;
1185
1186                         if (prev_dev) {
1187                                 skb2 = skb_clone(skb, GFP_ATOMIC);
1188                                 if (skb2) {
1189                                         skb2->dev = prev_dev;
1190                                         netif_rx(skb2);
1191                                 }
1192                         }
1193
1194                         prev_dev = sdata->dev;
1195                 }
1196         }
1197         if (prev_dev) {
1198                 skb->dev = prev_dev;
1199                 netif_rx(skb);
1200                 skb = NULL;
1201         }
1202         rcu_read_unlock();
1203         dev_kfree_skb(skb);
1204 }
1205 EXPORT_SYMBOL(ieee80211_tx_status);
1206
1207 struct ieee80211_hw *ieee80211_alloc_hw(size_t priv_data_len,
1208                                         const struct ieee80211_ops *ops)
1209 {
1210         struct ieee80211_local *local;
1211         int priv_size;
1212         struct wiphy *wiphy;
1213
1214         /* Ensure 32-byte alignment of our private data and hw private data.
1215          * We use the wiphy priv data for both our ieee80211_local and for
1216          * the driver's private data
1217          *
1218          * In memory it'll be like this:
1219          *
1220          * +-------------------------+
1221          * | struct wiphy           |
1222          * +-------------------------+
1223          * | struct ieee80211_local  |
1224          * +-------------------------+
1225          * | driver's private data   |
1226          * +-------------------------+
1227          *
1228          */
1229         priv_size = ((sizeof(struct ieee80211_local) +
1230                       NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST) +
1231                     priv_data_len;
1232
1233         wiphy = wiphy_new(&mac80211_config_ops, priv_size);
1234
1235         if (!wiphy)
1236                 return NULL;
1237
1238         wiphy->privid = mac80211_wiphy_privid;
1239
1240         local = wiphy_priv(wiphy);
1241         local->hw.wiphy = wiphy;
1242
1243         local->hw.priv = (char *)local +
1244                          ((sizeof(struct ieee80211_local) +
1245                            NETDEV_ALIGN_CONST) & ~NETDEV_ALIGN_CONST);
1246
1247         BUG_ON(!ops->tx);
1248         BUG_ON(!ops->start);
1249         BUG_ON(!ops->stop);
1250         BUG_ON(!ops->config);
1251         BUG_ON(!ops->add_interface);
1252         BUG_ON(!ops->remove_interface);
1253         BUG_ON(!ops->configure_filter);
1254         local->ops = ops;
1255
1256         local->hw.queues = 1; /* default */
1257
1258         local->bridge_packets = 1;
1259
1260         local->rts_threshold = IEEE80211_MAX_RTS_THRESHOLD;
1261         local->fragmentation_threshold = IEEE80211_MAX_FRAG_THRESHOLD;
1262         local->short_retry_limit = 7;
1263         local->long_retry_limit = 4;
1264         local->hw.conf.radio_enabled = 1;
1265
1266         INIT_LIST_HEAD(&local->interfaces);
1267
1268         spin_lock_init(&local->key_lock);
1269
1270         INIT_DELAYED_WORK(&local->scan_work, ieee80211_sta_scan_work);
1271
1272         sta_info_init(local);
1273
1274         tasklet_init(&local->tx_pending_tasklet, ieee80211_tx_pending,
1275                      (unsigned long)local);
1276         tasklet_disable(&local->tx_pending_tasklet);
1277
1278         tasklet_init(&local->tasklet,
1279                      ieee80211_tasklet_handler,
1280                      (unsigned long) local);
1281         tasklet_disable(&local->tasklet);
1282
1283         skb_queue_head_init(&local->skb_queue);
1284         skb_queue_head_init(&local->skb_queue_unreliable);
1285
1286         return local_to_hw(local);
1287 }
1288 EXPORT_SYMBOL(ieee80211_alloc_hw);
1289
1290 int ieee80211_register_hw(struct ieee80211_hw *hw)
1291 {
1292         struct ieee80211_local *local = hw_to_local(hw);
1293         const char *name;
1294         int result;
1295         enum ieee80211_band band;
1296         struct net_device *mdev;
1297         struct wireless_dev *mwdev;
1298
1299         /*
1300          * generic code guarantees at least one band,
1301          * set this very early because much code assumes
1302          * that hw.conf.channel is assigned
1303          */
1304         for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
1305                 struct ieee80211_supported_band *sband;
1306
1307                 sband = local->hw.wiphy->bands[band];
1308                 if (sband) {
1309                         /* init channel we're on */
1310                         local->hw.conf.channel =
1311                         local->oper_channel =
1312                         local->scan_channel = &sband->channels[0];
1313                         break;
1314                 }
1315         }
1316
1317         /* if low-level driver supports AP, we also support VLAN */
1318         if (local->hw.wiphy->interface_modes & BIT(NL80211_IFTYPE_AP))
1319                 local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_AP_VLAN);
1320
1321         /* mac80211 always supports monitor */
1322         local->hw.wiphy->interface_modes |= BIT(NL80211_IFTYPE_MONITOR);
1323
1324         result = wiphy_register(local->hw.wiphy);
1325         if (result < 0)
1326                 return result;
1327
1328         /*
1329          * We use the number of queues for feature tests (QoS, HT) internally
1330          * so restrict them appropriately.
1331          */
1332         if (hw->queues > IEEE80211_MAX_QUEUES)
1333                 hw->queues = IEEE80211_MAX_QUEUES;
1334         if (hw->ampdu_queues > IEEE80211_MAX_AMPDU_QUEUES)
1335                 hw->ampdu_queues = IEEE80211_MAX_AMPDU_QUEUES;
1336         if (hw->queues < 4)
1337                 hw->ampdu_queues = 0;
1338
1339         mdev = alloc_netdev_mq(sizeof(struct wireless_dev),
1340                                "wmaster%d", ether_setup,
1341                                ieee80211_num_queues(hw));
1342         if (!mdev)
1343                 goto fail_mdev_alloc;
1344
1345         mwdev = netdev_priv(mdev);
1346         mdev->ieee80211_ptr = mwdev;
1347         mwdev->wiphy = local->hw.wiphy;
1348
1349         local->mdev = mdev;
1350
1351         ieee80211_rx_bss_list_init(local);
1352
1353         mdev->hard_start_xmit = ieee80211_master_start_xmit;
1354         mdev->open = ieee80211_master_open;
1355         mdev->stop = ieee80211_master_stop;
1356         mdev->type = ARPHRD_IEEE80211;
1357         mdev->header_ops = &ieee80211_header_ops;
1358         mdev->set_multicast_list = ieee80211_master_set_multicast_list;
1359
1360         name = wiphy_dev(local->hw.wiphy)->driver->name;
1361         local->hw.workqueue = create_freezeable_workqueue(name);
1362         if (!local->hw.workqueue) {
1363                 result = -ENOMEM;
1364                 goto fail_workqueue;
1365         }
1366
1367         /*
1368          * The hardware needs headroom for sending the frame,
1369          * and we need some headroom for passing the frame to monitor
1370          * interfaces, but never both at the same time.
1371          */
1372         local->tx_headroom = max_t(unsigned int , local->hw.extra_tx_headroom,
1373                                    sizeof(struct ieee80211_tx_status_rtap_hdr));
1374
1375         debugfs_hw_add(local);
1376
1377         if (local->hw.conf.beacon_int < 10)
1378                 local->hw.conf.beacon_int = 100;
1379
1380         if (local->hw.max_listen_interval == 0)
1381                 local->hw.max_listen_interval = 1;
1382
1383         local->hw.conf.listen_interval = local->hw.max_listen_interval;
1384
1385         local->wstats_flags |= local->hw.flags & (IEEE80211_HW_SIGNAL_UNSPEC |
1386                                                   IEEE80211_HW_SIGNAL_DB |
1387                                                   IEEE80211_HW_SIGNAL_DBM) ?
1388                                IW_QUAL_QUAL_UPDATED : IW_QUAL_QUAL_INVALID;
1389         local->wstats_flags |= local->hw.flags & IEEE80211_HW_NOISE_DBM ?
1390                                IW_QUAL_NOISE_UPDATED : IW_QUAL_NOISE_INVALID;
1391         if (local->hw.flags & IEEE80211_HW_SIGNAL_DBM)
1392                 local->wstats_flags |= IW_QUAL_DBM;
1393
1394         result = sta_info_start(local);
1395         if (result < 0)
1396                 goto fail_sta_info;
1397
1398         rtnl_lock();
1399         result = dev_alloc_name(local->mdev, local->mdev->name);
1400         if (result < 0)
1401                 goto fail_dev;
1402
1403         memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1404         SET_NETDEV_DEV(local->mdev, wiphy_dev(local->hw.wiphy));
1405
1406         result = register_netdevice(local->mdev);
1407         if (result < 0)
1408                 goto fail_dev;
1409
1410         result = ieee80211_init_rate_ctrl_alg(local,
1411                                               hw->rate_control_algorithm);
1412         if (result < 0) {
1413                 printk(KERN_DEBUG "%s: Failed to initialize rate control "
1414                        "algorithm\n", wiphy_name(local->hw.wiphy));
1415                 goto fail_rate;
1416         }
1417
1418         result = ieee80211_wep_init(local);
1419
1420         if (result < 0) {
1421                 printk(KERN_DEBUG "%s: Failed to initialize wep: %d\n",
1422                        wiphy_name(local->hw.wiphy), result);
1423                 goto fail_wep;
1424         }
1425
1426         local->mdev->select_queue = ieee80211_select_queue;
1427
1428         /* add one default STA interface */
1429         result = ieee80211_if_add(local, "wlan%d", NULL,
1430                                   IEEE80211_IF_TYPE_STA, NULL);
1431         if (result)
1432                 printk(KERN_WARNING "%s: Failed to add default virtual iface\n",
1433                        wiphy_name(local->hw.wiphy));
1434
1435         rtnl_unlock();
1436
1437         ieee80211_led_init(local);
1438
1439         return 0;
1440
1441 fail_wep:
1442         rate_control_deinitialize(local);
1443 fail_rate:
1444         unregister_netdevice(local->mdev);
1445         local->mdev = NULL;
1446 fail_dev:
1447         rtnl_unlock();
1448         sta_info_stop(local);
1449 fail_sta_info:
1450         debugfs_hw_del(local);
1451         destroy_workqueue(local->hw.workqueue);
1452 fail_workqueue:
1453         if (local->mdev)
1454                 free_netdev(local->mdev);
1455 fail_mdev_alloc:
1456         wiphy_unregister(local->hw.wiphy);
1457         return result;
1458 }
1459 EXPORT_SYMBOL(ieee80211_register_hw);
1460
1461 void ieee80211_unregister_hw(struct ieee80211_hw *hw)
1462 {
1463         struct ieee80211_local *local = hw_to_local(hw);
1464
1465         tasklet_kill(&local->tx_pending_tasklet);
1466         tasklet_kill(&local->tasklet);
1467
1468         rtnl_lock();
1469
1470         /*
1471          * At this point, interface list manipulations are fine
1472          * because the driver cannot be handing us frames any
1473          * more and the tasklet is killed.
1474          */
1475
1476         /* First, we remove all virtual interfaces. */
1477         ieee80211_remove_interfaces(local);
1478
1479         /* then, finally, remove the master interface */
1480         unregister_netdevice(local->mdev);
1481
1482         rtnl_unlock();
1483
1484         ieee80211_rx_bss_list_deinit(local);
1485         ieee80211_clear_tx_pending(local);
1486         sta_info_stop(local);
1487         rate_control_deinitialize(local);
1488         debugfs_hw_del(local);
1489
1490         if (skb_queue_len(&local->skb_queue)
1491                         || skb_queue_len(&local->skb_queue_unreliable))
1492                 printk(KERN_WARNING "%s: skb_queue not empty\n",
1493                        wiphy_name(local->hw.wiphy));
1494         skb_queue_purge(&local->skb_queue);
1495         skb_queue_purge(&local->skb_queue_unreliable);
1496
1497         destroy_workqueue(local->hw.workqueue);
1498         wiphy_unregister(local->hw.wiphy);
1499         ieee80211_wep_free(local);
1500         ieee80211_led_exit(local);
1501         free_netdev(local->mdev);
1502 }
1503 EXPORT_SYMBOL(ieee80211_unregister_hw);
1504
1505 void ieee80211_free_hw(struct ieee80211_hw *hw)
1506 {
1507         struct ieee80211_local *local = hw_to_local(hw);
1508
1509         wiphy_free(local->hw.wiphy);
1510 }
1511 EXPORT_SYMBOL(ieee80211_free_hw);
1512
1513 static int __init ieee80211_init(void)
1514 {
1515         struct sk_buff *skb;
1516         int ret;
1517
1518         BUILD_BUG_ON(sizeof(struct ieee80211_tx_info) > sizeof(skb->cb));
1519         BUILD_BUG_ON(offsetof(struct ieee80211_tx_info, driver_data) +
1520                      IEEE80211_TX_INFO_DRIVER_DATA_SIZE > sizeof(skb->cb));
1521
1522         ret = rc80211_pid_init();
1523         if (ret)
1524                 return ret;
1525
1526         ieee80211_debugfs_netdev_init();
1527
1528         return 0;
1529 }
1530
1531 static void __exit ieee80211_exit(void)
1532 {
1533         rc80211_pid_exit();
1534
1535         /*
1536          * For key todo, it'll be empty by now but the work
1537          * might still be scheduled.
1538          */
1539         flush_scheduled_work();
1540
1541         if (mesh_allocated)
1542                 ieee80211s_stop();
1543
1544         ieee80211_debugfs_netdev_exit();
1545 }
1546
1547
1548 subsys_initcall(ieee80211_init);
1549 module_exit(ieee80211_exit);
1550
1551 MODULE_DESCRIPTION("IEEE 802.11 subsystem");
1552 MODULE_LICENSE("GPL");