SAFE public projects git trees. - safe/jmp/linux-2.6/blob - net/mac80211/iface.c

   1 /*
   2  * Interface handling (except master interface)
   3  *
   4  * Copyright 2002-2005, Instant802 Networks, Inc.
   5  * Copyright 2005-2006, Devicescape Software, Inc.
   6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/kernel.h>
  14 #include <linux/if_arp.h>
  15 #include <linux/netdevice.h>
  16 #include <linux/rtnetlink.h>
  17 #include <net/mac80211.h>
  18 #include "ieee80211_i.h"
  19 #include "sta_info.h"
  20 #include "debugfs_netdev.h"
  21 #include "mesh.h"
  22 #include "led.h"
  23
  24 /**
  25  * DOC: Interface list locking
  26  *
  27  * The interface list in each struct ieee80211_local is protected
  28  * three-fold:
  29  *
  30  * (1) modifications may only be done under the RTNL
  31  * (2) modifications and readers are protected against each other by
  32  *     the iflist_mtx.
  33  * (3) modifications are done in an RCU manner so atomic readers
  34  *     can traverse the list in RCU-safe blocks.
  35  *
  36  * As a consequence, reads (traversals) of the list can be protected
  37  * by either the RTNL, the iflist_mtx or RCU.
  38  */
  39
  40
  41 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
  42 {
  43         int meshhdrlen;
  44         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  45
  46         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
  47
  48         /* FIX: what would be proper limits for MTU?
  49          * This interface uses 802.3 frames. */
  50         if (new_mtu < 256 ||
  51             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
  52                 return -EINVAL;
  53         }
  54
  55 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
  56         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
  57 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
  58         dev->mtu = new_mtu;
  59         return 0;
  60 }
  61
  62 static inline int identical_mac_addr_allowed(int type1, int type2)
  63 {
  64         return type1 == NL80211_IFTYPE_MONITOR ||
  65                 type2 == NL80211_IFTYPE_MONITOR ||
  66                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
  67                 (type1 == NL80211_IFTYPE_WDS &&
  68                         (type2 == NL80211_IFTYPE_WDS ||
  69                          type2 == NL80211_IFTYPE_AP)) ||
  70                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
  71                 (type1 == NL80211_IFTYPE_AP_VLAN &&
  72                         (type2 == NL80211_IFTYPE_AP ||
  73                          type2 == NL80211_IFTYPE_AP_VLAN));
  74 }
  75
  76 static int ieee80211_open(struct net_device *dev)
  77 {
  78         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  79         struct ieee80211_sub_if_data *nsdata;
  80         struct ieee80211_local *local = sdata->local;
  81         struct sta_info *sta;
  82         struct ieee80211_if_init_conf conf;
  83         u32 changed = 0;
  84         int res;
  85         u32 hw_reconf_flags = 0;
  86         u8 null_addr[ETH_ALEN] = {0};
  87
  88         /* fail early if user set an invalid address */
  89         if (compare_ether_addr(dev->dev_addr, null_addr) &&
  90             !is_valid_ether_addr(dev->dev_addr))
  91                 return -EADDRNOTAVAIL;
  92
  93         /* we hold the RTNL here so can safely walk the list */
  94         list_for_each_entry(nsdata, &local->interfaces, list) {
  95                 struct net_device *ndev = nsdata->dev;
  96
  97                 if (ndev != dev && netif_running(ndev)) {
  98                         /*
  99                          * Allow only a single IBSS interface to be up at any
 100                          * time. This is restricted because beacon distribution
 101                          * cannot work properly if both are in the same IBSS.
 102                          *
 103                          * To remove this restriction we'd have to disallow them
 104                          * from setting the same SSID on different IBSS interfaces
 105                          * belonging to the same hardware. Then, however, we're
 106                          * faced with having to adopt two different TSF timers...
 107                          */
 108                         if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 109                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 110                                 return -EBUSY;
 111
 112                         /*
 113                          * The remaining checks are only performed for interfaces
 114                          * with the same MAC address.
 115                          */
 116                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 117                                 continue;
 118
 119                         /*
 120                          * check whether it may have the same address
 121                          */
 122                         if (!identical_mac_addr_allowed(sdata->vif.type,
 123                                                         nsdata->vif.type))
 124                                 return -ENOTUNIQ;
 125
 126                         /*
 127                          * can only add VLANs to enabled APs
 128                          */
 129                         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN &&
 130                             nsdata->vif.type == NL80211_IFTYPE_AP)
 131                                 sdata->bss = &nsdata->u.ap;
 132                 }
 133         }
 134
 135         switch (sdata->vif.type) {
 136         case NL80211_IFTYPE_WDS:
 137                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 138                         return -ENOLINK;
 139                 break;
 140         case NL80211_IFTYPE_AP_VLAN:
 141                 if (!sdata->bss)
 142                         return -ENOLINK;
 143                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 144                 break;
 145         case NL80211_IFTYPE_AP:
 146                 sdata->bss = &sdata->u.ap;
 147                 break;
 148         case NL80211_IFTYPE_MESH_POINT:
 149                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 150                         break;
 151                 /* mesh ifaces must set allmulti to forward mcast traffic */
 152                 atomic_inc(&local->iff_allmultis);
 153                 break;
 154         case NL80211_IFTYPE_STATION:
 155         case NL80211_IFTYPE_MONITOR:
 156         case NL80211_IFTYPE_ADHOC:
 157                 /* no special treatment */
 158                 break;
 159         case NL80211_IFTYPE_UNSPECIFIED:
 160         case __NL80211_IFTYPE_AFTER_LAST:
 161                 /* cannot happen */
 162                 WARN_ON(1);
 163                 break;
 164         }
 165
 166         if (local->open_count == 0) {
 167                 res = 0;
 168                 if (local->ops->start)
 169                         res = local->ops->start(local_to_hw(local));
 170                 if (res)
 171                         goto err_del_bss;
 172                 /* we're brought up, everything changes */
 173                 hw_reconf_flags = ~0;
 174                 ieee80211_led_radio(local, local->hw.conf.radio_enabled);
 175         }
 176
 177         /*
 178          * Check all interfaces and copy the hopefully now-present
 179          * MAC address to those that have the special null one.
 180          */
 181         list_for_each_entry(nsdata, &local->interfaces, list) {
 182                 struct net_device *ndev = nsdata->dev;
 183
 184                 /*
 185                  * No need to check netif_running since we do not allow
 186                  * it to start up with this invalid address.
 187                  */
 188                 if (compare_ether_addr(null_addr, ndev->dev_addr) == 0)
 189                         memcpy(ndev->dev_addr,
 190                                local->hw.wiphy->perm_addr,
 191                                ETH_ALEN);
 192         }
 193
 194         if (compare_ether_addr(null_addr, local->mdev->dev_addr) == 0)
 195                 memcpy(local->mdev->dev_addr, local->hw.wiphy->perm_addr,
 196                        ETH_ALEN);
 197
 198         /*
 199          * Validate the MAC address for this device.
 200          */
 201         if (!is_valid_ether_addr(dev->dev_addr)) {
 202                 if (!local->open_count && local->ops->stop)
 203                         local->ops->stop(local_to_hw(local));
 204                 return -EADDRNOTAVAIL;
 205         }
 206
 207         switch (sdata->vif.type) {
 208         case NL80211_IFTYPE_AP_VLAN:
 209                 /* no need to tell driver */
 210                 break;
 211         case NL80211_IFTYPE_MONITOR:
 212                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 213                         local->cooked_mntrs++;
 214                         break;
 215                 }
 216
 217                 /* must be before the call to ieee80211_configure_filter */
 218                 local->monitors++;
 219                 if (local->monitors == 1) {
 220                         local->hw.conf.flags |= IEEE80211_CONF_RADIOTAP;
 221                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
 222                 }
 223
 224                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 225                         local->fif_fcsfail++;
 226                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 227                         local->fif_plcpfail++;
 228                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 229                         local->fif_control++;
 230                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 231                         local->fif_other_bss++;
 232
 233                 netif_addr_lock_bh(local->mdev);
 234                 ieee80211_configure_filter(local);
 235                 netif_addr_unlock_bh(local->mdev);
 236                 break;
 237         case NL80211_IFTYPE_STATION:
 238         case NL80211_IFTYPE_ADHOC:
 239                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
 240                         sdata->u.mgd.flags &= ~IEEE80211_STA_PREV_BSSID_SET;
 241                 else
 242                         sdata->u.ibss.flags &= ~IEEE80211_IBSS_PREV_BSSID_SET;
 243                 /* fall through */
 244         default:
 245                 conf.vif = &sdata->vif;
 246                 conf.type = sdata->vif.type;
 247                 conf.mac_addr = dev->dev_addr;
 248                 res = local->ops->add_interface(local_to_hw(local), &conf);
 249                 if (res)
 250                         goto err_stop;
 251
 252                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 253                         local->fif_other_bss++;
 254                         netif_addr_lock_bh(local->mdev);
 255                         ieee80211_configure_filter(local);
 256                         netif_addr_unlock_bh(local->mdev);
 257
 258                         ieee80211_start_mesh(sdata);
 259                 }
 260                 changed |= ieee80211_reset_erp_info(sdata);
 261                 ieee80211_bss_info_change_notify(sdata, changed);
 262                 ieee80211_enable_keys(sdata);
 263
 264                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
 265                         netif_carrier_off(dev);
 266                 else
 267                         netif_carrier_on(dev);
 268         }
 269
 270         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 271                 /* Create STA entry for the WDS peer */
 272                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 273                                      GFP_KERNEL);
 274                 if (!sta) {
 275                         res = -ENOMEM;
 276                         goto err_del_interface;
 277                 }
 278
 279                 /* no locking required since STA is not live yet */
 280                 sta->flags |= WLAN_STA_AUTHORIZED;
 281
 282                 res = sta_info_insert(sta);
 283                 if (res) {
 284                         /* STA has been freed */
 285                         goto err_del_interface;
 286                 }
 287         }
 288
 289         if (local->open_count == 0) {
 290                 res = dev_open(local->mdev);
 291                 WARN_ON(res);
 292                 if (res)
 293                         goto err_del_interface;
 294                 tasklet_enable(&local->tx_pending_tasklet);
 295                 tasklet_enable(&local->tasklet);
 296         }
 297
 298         /*
 299          * set_multicast_list will be invoked by the networking core
 300          * which will check whether any increments here were done in
 301          * error and sync them down to the hardware as filter flags.
 302          */
 303         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 304                 atomic_inc(&local->iff_allmultis);
 305
 306         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 307                 atomic_inc(&local->iff_promiscs);
 308
 309         local->open_count++;
 310         if (hw_reconf_flags) {
 311                 ieee80211_hw_config(local, hw_reconf_flags);
 312                 /*
 313                  * set default queue parameters so drivers don't
 314                  * need to initialise the hardware if the hardware
 315                  * doesn't start up with sane defaults
 316                  */
 317                 ieee80211_set_wmm_default(sdata);
 318         }
 319
 320         ieee80211_recalc_ps(local, -1);
 321
 322         /*
 323          * ieee80211_sta_work is disabled while network interface
 324          * is down. Therefore, some configuration changes may not
 325          * yet be effective. Trigger execution of ieee80211_sta_work
 326          * to fix this.
 327          */
 328         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 329                 queue_work(local->hw.workqueue, &sdata->u.mgd.work);
 330         else if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 331                 queue_work(local->hw.workqueue, &sdata->u.ibss.work);
 332
 333         netif_tx_start_all_queues(dev);
 334
 335         return 0;
 336  err_del_interface:
 337         local->ops->remove_interface(local_to_hw(local), &conf);
 338  err_stop:
 339         if (!local->open_count && local->ops->stop)
 340                 local->ops->stop(local_to_hw(local));
 341  err_del_bss:
 342         sdata->bss = NULL;
 343         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 344                 list_del(&sdata->u.vlan.list);
 345         return res;
 346 }
 347
 348 static int ieee80211_stop(struct net_device *dev)
 349 {
 350         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 351         struct ieee80211_local *local = sdata->local;
 352         struct ieee80211_if_init_conf conf;
 353         struct sta_info *sta;
 354         u32 hw_reconf_flags = 0;
 355
 356         /*
 357          * Stop TX on this interface first.
 358          */
 359         netif_tx_stop_all_queues(dev);
 360
 361         /*
 362          * Now delete all active aggregation sessions.
 363          */
 364         rcu_read_lock();
 365
 366         list_for_each_entry_rcu(sta, &local->sta_list, list) {
 367                 if (sta->sdata == sdata)
 368                         ieee80211_sta_tear_down_BA_sessions(sta);
 369         }
 370
 371         rcu_read_unlock();
 372
 373         /*
 374          * Announce that we are leaving the network, in case we are a
 375          * station interface type. This must be done before removing
 376          * all stations associated with sta_info_flush, otherwise STA
 377          * information will be gone and no announce being done.
 378          */
 379         if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 380                 if (sdata->u.mgd.state != IEEE80211_STA_MLME_DISABLED)
 381                         ieee80211_sta_deauthenticate(sdata,
 382                                 WLAN_REASON_DEAUTH_LEAVING);
 383         }
 384
 385         /*
 386          * Remove all stations associated with this interface.
 387          *
 388          * This must be done before calling ops->remove_interface()
 389          * because otherwise we can later invoke ops->sta_notify()
 390          * whenever the STAs are removed, and that invalidates driver
 391          * assumptions about always getting a vif pointer that is valid
 392          * (because if we remove a STA after ops->remove_interface()
 393          * the driver will have removed the vif info already!)
 394          *
 395          * We could relax this and only unlink the stations from the
 396          * hash table and list but keep them on a per-sdata list that
 397          * will be inserted back again when the interface is brought
 398          * up again, but I don't currently see a use case for that,
 399          * except with WDS which gets a STA entry created when it is
 400          * brought up.
 401          */
 402         sta_info_flush(local, sdata);
 403
 404         /*
 405          * Don't count this interface for promisc/allmulti while it
 406          * is down. dev_mc_unsync() will invoke set_multicast_list
 407          * on the master interface which will sync these down to the
 408          * hardware as filter flags.
 409          */
 410         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 411                 atomic_dec(&local->iff_allmultis);
 412
 413         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 414                 atomic_dec(&local->iff_promiscs);
 415
 416         dev_mc_unsync(local->mdev, dev);
 417         del_timer_sync(&local->dynamic_ps_timer);
 418         cancel_work_sync(&local->dynamic_ps_enable_work);
 419
 420         /* APs need special treatment */
 421         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 422                 struct ieee80211_sub_if_data *vlan, *tmp;
 423                 struct beacon_data *old_beacon = sdata->u.ap.beacon;
 424
 425                 /* remove beacon */
 426                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 427                 synchronize_rcu();
 428                 kfree(old_beacon);
 429
 430                 /* down all dependent devices, that is VLANs */
 431                 list_for_each_entry_safe(vlan, tmp, &sdata->u.ap.vlans,
 432                                          u.vlan.list)
 433                         dev_close(vlan->dev);
 434                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 435         }
 436
 437         local->open_count--;
 438
 439         switch (sdata->vif.type) {
 440         case NL80211_IFTYPE_AP_VLAN:
 441                 list_del(&sdata->u.vlan.list);
 442                 /* no need to tell driver */
 443                 break;
 444         case NL80211_IFTYPE_MONITOR:
 445                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 446                         local->cooked_mntrs--;
 447                         break;
 448                 }
 449
 450                 local->monitors--;
 451                 if (local->monitors == 0) {
 452                         local->hw.conf.flags &= ~IEEE80211_CONF_RADIOTAP;
 453                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_RADIOTAP;
 454                 }
 455
 456                 if (sdata->u.mntr_flags & MONITOR_FLAG_FCSFAIL)
 457                         local->fif_fcsfail--;
 458                 if (sdata->u.mntr_flags & MONITOR_FLAG_PLCPFAIL)
 459                         local->fif_plcpfail--;
 460                 if (sdata->u.mntr_flags & MONITOR_FLAG_CONTROL)
 461                         local->fif_control--;
 462                 if (sdata->u.mntr_flags & MONITOR_FLAG_OTHER_BSS)
 463                         local->fif_other_bss--;
 464
 465                 netif_addr_lock_bh(local->mdev);
 466                 ieee80211_configure_filter(local);
 467                 netif_addr_unlock_bh(local->mdev);
 468                 break;
 469         case NL80211_IFTYPE_STATION:
 470                 memset(sdata->u.mgd.bssid, 0, ETH_ALEN);
 471                 del_timer_sync(&sdata->u.mgd.chswitch_timer);
 472                 del_timer_sync(&sdata->u.mgd.timer);
 473                 /*
 474                  * If the timer fired while we waited for it, it will have
 475                  * requeued the work. Now the work will be running again
 476                  * but will not rearm the timer again because it checks
 477                  * whether the interface is running, which, at this point,
 478                  * it no longer is.
 479                  */
 480                 cancel_work_sync(&sdata->u.mgd.work);
 481                 cancel_work_sync(&sdata->u.mgd.chswitch_work);
 482
 483                 cancel_work_sync(&sdata->u.mgd.beacon_loss_work);
 484
 485                 /*
 486                  * When we get here, the interface is marked down.
 487                  * Call synchronize_rcu() to wait for the RX path
 488                  * should it be using the interface and enqueuing
 489                  * frames at this very time on another CPU.
 490                  */
 491                 synchronize_rcu();
 492                 skb_queue_purge(&sdata->u.mgd.skb_queue);
 493
 494                 sdata->u.mgd.flags &= ~(IEEE80211_STA_PRIVACY_INVOKED |
 495                                         IEEE80211_STA_TKIP_WEP_USED);
 496                 kfree(sdata->u.mgd.extra_ie);
 497                 sdata->u.mgd.extra_ie = NULL;
 498                 sdata->u.mgd.extra_ie_len = 0;
 499                 /* fall through */
 500         case NL80211_IFTYPE_ADHOC:
 501                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 502                         memset(sdata->u.ibss.bssid, 0, ETH_ALEN);
 503                         del_timer_sync(&sdata->u.ibss.timer);
 504                         cancel_work_sync(&sdata->u.ibss.work);
 505                         synchronize_rcu();
 506                         skb_queue_purge(&sdata->u.ibss.skb_queue);
 507                 }
 508                 /* fall through */
 509         case NL80211_IFTYPE_MESH_POINT:
 510                 if (ieee80211_vif_is_mesh(&sdata->vif)) {
 511                         /* other_bss and allmulti are always set on mesh
 512                          * ifaces */
 513                         local->fif_other_bss--;
 514                         atomic_dec(&local->iff_allmultis);
 515
 516                         netif_addr_lock_bh(local->mdev);
 517                         ieee80211_configure_filter(local);
 518                         netif_addr_unlock_bh(local->mdev);
 519
 520                         ieee80211_stop_mesh(sdata);
 521                 }
 522                 /* fall through */
 523         default:
 524                 if (local->scan_sdata == sdata) {
 525                         if (!local->ops->hw_scan)
 526                                 cancel_delayed_work_sync(&local->scan_work);
 527                         /*
 528                          * The software scan can no longer run now, so we can
 529                          * clear out the scan_sdata reference. However, the
 530                          * hardware scan may still be running. The complete
 531                          * function must be prepared to handle a NULL value.
 532                          */
 533                         local->scan_sdata = NULL;
 534                         /*
 535                          * The memory barrier guarantees that another CPU
 536                          * that is hardware-scanning will now see the fact
 537                          * that this interface is gone.
 538                          */
 539                         smp_mb();
 540                         /*
 541                          * If software scanning, complete the scan but since
 542                          * the scan_sdata is NULL already don't send out a
 543                          * scan event to userspace -- the scan is incomplete.
 544                          */
 545                         if (local->sw_scanning)
 546                                 ieee80211_scan_completed(&local->hw, true);
 547                 }
 548
 549                 conf.vif = &sdata->vif;
 550                 conf.type = sdata->vif.type;
 551                 conf.mac_addr = dev->dev_addr;
 552                 /* disable all keys for as long as this netdev is down */
 553                 ieee80211_disable_keys(sdata);
 554                 local->ops->remove_interface(local_to_hw(local), &conf);
 555         }
 556
 557         sdata->bss = NULL;
 558
 559         if (local->open_count == 0) {
 560                 if (netif_running(local->mdev))
 561                         dev_close(local->mdev);
 562
 563                 if (local->ops->stop)
 564                         local->ops->stop(local_to_hw(local));
 565
 566                 ieee80211_led_radio(local, 0);
 567
 568                 flush_workqueue(local->hw.workqueue);
 569
 570                 tasklet_disable(&local->tx_pending_tasklet);
 571                 tasklet_disable(&local->tasklet);
 572
 573                 /* no reconfiguring after stop! */
 574                 hw_reconf_flags = 0;
 575         }
 576
 577         ieee80211_recalc_ps(local, -1);
 578
 579         /* do after stop to avoid reconfiguring when we stop anyway */
 580         if (hw_reconf_flags)
 581                 ieee80211_hw_config(local, hw_reconf_flags);
 582
 583         return 0;
 584 }
 585
 586 static void ieee80211_set_multicast_list(struct net_device *dev)
 587 {
 588         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 589         struct ieee80211_local *local = sdata->local;
 590         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 591
 592         allmulti = !!(dev->flags & IFF_ALLMULTI);
 593         promisc = !!(dev->flags & IFF_PROMISC);
 594         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 595         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 596
 597         if (allmulti != sdata_allmulti) {
 598                 if (dev->flags & IFF_ALLMULTI)
 599                         atomic_inc(&local->iff_allmultis);
 600                 else
 601                         atomic_dec(&local->iff_allmultis);
 602                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 603         }
 604
 605         if (promisc != sdata_promisc) {
 606                 if (dev->flags & IFF_PROMISC)
 607                         atomic_inc(&local->iff_promiscs);
 608                 else
 609                         atomic_dec(&local->iff_promiscs);
 610                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 611         }
 612
 613         dev_mc_sync(local->mdev, dev);
 614 }
 615
 616 /*
 617  * Called when the netdev is removed or, by the code below, before
 618  * the interface type changes.
 619  */
 620 static void ieee80211_teardown_sdata(struct net_device *dev)
 621 {
 622         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 623         struct ieee80211_local *local = sdata->local;
 624         struct beacon_data *beacon;
 625         struct sk_buff *skb;
 626         int flushed;
 627         int i;
 628
 629         /* free extra data */
 630         ieee80211_free_keys(sdata);
 631
 632         ieee80211_debugfs_remove_netdev(sdata);
 633
 634         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 635                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 636         sdata->fragment_next = 0;
 637
 638         switch (sdata->vif.type) {
 639         case NL80211_IFTYPE_AP:
 640                 beacon = sdata->u.ap.beacon;
 641                 rcu_assign_pointer(sdata->u.ap.beacon, NULL);
 642                 synchronize_rcu();
 643                 kfree(beacon);
 644
 645                 while ((skb = skb_dequeue(&sdata->u.ap.ps_bc_buf))) {
 646                         local->total_ps_buffered--;
 647                         dev_kfree_skb(skb);
 648                 }
 649
 650                 break;
 651         case NL80211_IFTYPE_MESH_POINT:
 652                 if (ieee80211_vif_is_mesh(&sdata->vif))
 653                         mesh_rmc_free(sdata);
 654                 break;
 655         case NL80211_IFTYPE_ADHOC:
 656                 kfree_skb(sdata->u.ibss.probe_resp);
 657                 break;
 658         case NL80211_IFTYPE_STATION:
 659                 kfree(sdata->u.mgd.extra_ie);
 660                 kfree(sdata->u.mgd.assocreq_ies);
 661                 kfree(sdata->u.mgd.assocresp_ies);
 662                 kfree(sdata->u.mgd.sme_auth_ie);
 663                 break;
 664         case NL80211_IFTYPE_WDS:
 665         case NL80211_IFTYPE_AP_VLAN:
 666         case NL80211_IFTYPE_MONITOR:
 667                 break;
 668         case NL80211_IFTYPE_UNSPECIFIED:
 669         case __NL80211_IFTYPE_AFTER_LAST:
 670                 BUG();
 671                 break;
 672         }
 673
 674         flushed = sta_info_flush(local, sdata);
 675         WARN_ON(flushed);
 676 }
 677
 678 static const struct net_device_ops ieee80211_dataif_ops = {
 679         .ndo_open               = ieee80211_open,
 680         .ndo_stop               = ieee80211_stop,
 681         .ndo_uninit             = ieee80211_teardown_sdata,
 682         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 683         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 684         .ndo_change_mtu         = ieee80211_change_mtu,
 685         .ndo_set_mac_address    = eth_mac_addr,
 686 };
 687
 688 static const struct net_device_ops ieee80211_monitorif_ops = {
 689         .ndo_open               = ieee80211_open,
 690         .ndo_stop               = ieee80211_stop,
 691         .ndo_uninit             = ieee80211_teardown_sdata,
 692         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 693         .ndo_set_multicast_list = ieee80211_set_multicast_list,
 694         .ndo_change_mtu         = ieee80211_change_mtu,
 695         .ndo_set_mac_address    = eth_mac_addr,
 696 };
 697
 698 static void ieee80211_if_setup(struct net_device *dev)
 699 {
 700         ether_setup(dev);
 701         dev->netdev_ops = &ieee80211_dataif_ops;
 702         dev->wireless_handlers = &ieee80211_iw_handler_def;
 703         dev->destructor = free_netdev;
 704 }
 705
 706 /*
 707  * Helper function to initialise an interface to a specific type.
 708  */
 709 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 710                                   enum nl80211_iftype type)
 711 {
 712         /* clear type-dependent union */
 713         memset(&sdata->u, 0, sizeof(sdata->u));
 714
 715         /* and set some type-dependent values */
 716         sdata->vif.type = type;
 717         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 718         sdata->wdev.iftype = type;
 719
 720         /* only monitor differs */
 721         sdata->dev->type = ARPHRD_ETHER;
 722
 723         switch (type) {
 724         case NL80211_IFTYPE_AP:
 725                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 726                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 727                 break;
 728         case NL80211_IFTYPE_STATION:
 729                 ieee80211_sta_setup_sdata(sdata);
 730                 break;
 731         case NL80211_IFTYPE_ADHOC:
 732                 ieee80211_ibss_setup_sdata(sdata);
 733                 break;
 734         case NL80211_IFTYPE_MESH_POINT:
 735                 if (ieee80211_vif_is_mesh(&sdata->vif))
 736                         ieee80211_mesh_init_sdata(sdata);
 737                 break;
 738         case NL80211_IFTYPE_MONITOR:
 739                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
 740                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
 741                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
 742                                       MONITOR_FLAG_OTHER_BSS;
 743                 break;
 744         case NL80211_IFTYPE_WDS:
 745         case NL80211_IFTYPE_AP_VLAN:
 746                 break;
 747         case NL80211_IFTYPE_UNSPECIFIED:
 748         case __NL80211_IFTYPE_AFTER_LAST:
 749                 BUG();
 750                 break;
 751         }
 752
 753         ieee80211_debugfs_add_netdev(sdata);
 754 }
 755
 756 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
 757                              enum nl80211_iftype type)
 758 {
 759         ASSERT_RTNL();
 760
 761         if (type == sdata->vif.type)
 762                 return 0;
 763
 764         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
 765         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
 766             type == NL80211_IFTYPE_ADHOC)
 767                 return -EOPNOTSUPP;
 768
 769         /*
 770          * We could, here, on changes between IBSS/STA/MESH modes,
 771          * invoke an MLME function instead that disassociates etc.
 772          * and goes into the requested mode.
 773          */
 774
 775         if (netif_running(sdata->dev))
 776                 return -EBUSY;
 777
 778         /* Purge and reset type-dependent state. */
 779         ieee80211_teardown_sdata(sdata->dev);
 780         ieee80211_setup_sdata(sdata, type);
 781
 782         /* reset some values that shouldn't be kept across type changes */
 783         sdata->vif.bss_conf.basic_rates =
 784                 ieee80211_mandatory_rates(sdata->local,
 785                         sdata->local->hw.conf.channel->band);
 786         sdata->drop_unencrypted = 0;
 787
 788         return 0;
 789 }
 790
 791 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
 792                      struct net_device **new_dev, enum nl80211_iftype type,
 793                      struct vif_params *params)
 794 {
 795         struct net_device *ndev;
 796         struct ieee80211_sub_if_data *sdata = NULL;
 797         int ret, i;
 798
 799         ASSERT_RTNL();
 800
 801         ndev = alloc_netdev(sizeof(*sdata) + local->hw.vif_data_size,
 802                             name, ieee80211_if_setup);
 803         if (!ndev)
 804                 return -ENOMEM;
 805
 806         ndev->needed_headroom = local->tx_headroom +
 807                                 4*6 /* four MAC addresses */
 808                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
 809                                 + 6 /* mesh */
 810                                 + 8 /* rfc1042/bridge tunnel */
 811                                 - ETH_HLEN /* ethernet hard_header_len */
 812                                 + IEEE80211_ENCRYPT_HEADROOM;
 813         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
 814
 815         ret = dev_alloc_name(ndev, ndev->name);
 816         if (ret < 0)
 817                 goto fail;
 818
 819         memcpy(ndev->dev_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
 820         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
 821         ndev->features |= NETIF_F_NETNS_LOCAL;
 822
 823         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
 824         sdata = netdev_priv(ndev);
 825         ndev->ieee80211_ptr = &sdata->wdev;
 826
 827         /* initialise type-independent data */
 828         sdata->wdev.wiphy = local->hw.wiphy;
 829         sdata->local = local;
 830         sdata->dev = ndev;
 831
 832         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 833                 skb_queue_head_init(&sdata->fragments[i].skb_list);
 834
 835         INIT_LIST_HEAD(&sdata->key_list);
 836
 837         sdata->force_unicast_rateidx = -1;
 838         sdata->max_ratectrl_rateidx = -1;
 839
 840         /* setup type-dependent data */
 841         ieee80211_setup_sdata(sdata, type);
 842
 843         ret = register_netdevice(ndev);
 844         if (ret)
 845                 goto fail;
 846
 847         if (ieee80211_vif_is_mesh(&sdata->vif) &&
 848             params && params->mesh_id_len)
 849                 ieee80211_sdata_set_mesh_id(sdata,
 850                                             params->mesh_id_len,
 851                                             params->mesh_id);
 852
 853         mutex_lock(&local->iflist_mtx);
 854         list_add_tail_rcu(&sdata->list, &local->interfaces);
 855         mutex_unlock(&local->iflist_mtx);
 856
 857         if (new_dev)
 858                 *new_dev = ndev;
 859
 860         return 0;
 861
 862  fail:
 863         free_netdev(ndev);
 864         return ret;
 865 }
 866
 867 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
 868 {
 869         ASSERT_RTNL();
 870
 871         mutex_lock(&sdata->local->iflist_mtx);
 872         list_del_rcu(&sdata->list);
 873         mutex_unlock(&sdata->local->iflist_mtx);
 874
 875         synchronize_rcu();
 876         unregister_netdevice(sdata->dev);
 877 }
 878
 879 /*
 880  * Remove all interfaces, may only be called at hardware unregistration
 881  * time because it doesn't do RCU-safe list removals.
 882  */
 883 void ieee80211_remove_interfaces(struct ieee80211_local *local)
 884 {
 885         struct ieee80211_sub_if_data *sdata, *tmp;
 886
 887         ASSERT_RTNL();
 888
 889         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
 890                 /*
 891                  * we cannot hold the iflist_mtx across unregister_netdevice,
 892                  * but we only need to hold it for list modifications to lock
 893                  * out readers since we're under the RTNL here as all other
 894                  * writers.
 895                  */
 896                 mutex_lock(&local->iflist_mtx);
 897                 list_del(&sdata->list);
 898                 mutex_unlock(&local->iflist_mtx);
 899
 900                 unregister_netdevice(sdata->dev);
 901         }
 902 }