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/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/if_arp.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/rtnetlink.h>
  18 #include <net/mac80211.h>
  19 #include <net/ieee80211_radiotap.h>
  20 #include "ieee80211_i.h"
  21 #include "sta_info.h"
  22 #include "debugfs_netdev.h"
  23 #include "mesh.h"
  24 #include "led.h"
  25 #include "driver-ops.h"
  26 #include "wme.h"
  27 #include "rate.h"
  28
  29 /**
  30  * DOC: Interface list locking
  31  *
  32  * The interface list in each struct ieee80211_local is protected
  33  * three-fold:
  34  *
  35  * (1) modifications may only be done under the RTNL
  36  * (2) modifications and readers are protected against each other by
  37  *     the iflist_mtx.
  38  * (3) modifications are done in an RCU manner so atomic readers
  39  *     can traverse the list in RCU-safe blocks.
  40  *
  41  * As a consequence, reads (traversals) of the list can be protected
  42  * by either the RTNL, the iflist_mtx or RCU.
  43  */
  44
  45
  46 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
  47 {
  48         int meshhdrlen;
  49         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  50
  51         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
  52
  53         /* FIX: what would be proper limits for MTU?
  54          * This interface uses 802.3 frames. */
  55         if (new_mtu < 256 ||
  56             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
  57                 return -EINVAL;
  58         }
  59
  60 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
  61         printk(KERN_DEBUG "%s: setting MTU %d\n", dev->name, new_mtu);
  62 #endif /* CONFIG_MAC80211_VERBOSE_DEBUG */
  63         dev->mtu = new_mtu;
  64         return 0;
  65 }
  66
  67 static int ieee80211_change_mac(struct net_device *dev, void *addr)
  68 {
  69         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
  70         struct sockaddr *sa = addr;
  71         int ret;
  72
  73         if (ieee80211_sdata_running(sdata))
  74                 return -EBUSY;
  75
  76         ret = eth_mac_addr(dev, sa);
  77
  78         if (ret == 0)
  79                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
  80
  81         return ret;
  82 }
  83
  84 static inline int identical_mac_addr_allowed(int type1, int type2)
  85 {
  86         return type1 == NL80211_IFTYPE_MONITOR ||
  87                 type2 == NL80211_IFTYPE_MONITOR ||
  88                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
  89                 (type1 == NL80211_IFTYPE_WDS &&
  90                         (type2 == NL80211_IFTYPE_WDS ||
  91                          type2 == NL80211_IFTYPE_AP)) ||
  92                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
  93                 (type1 == NL80211_IFTYPE_AP_VLAN &&
  94                         (type2 == NL80211_IFTYPE_AP ||
  95                          type2 == NL80211_IFTYPE_AP_VLAN));
  96 }
  97
  98 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
  99                                             enum nl80211_iftype iftype)
 100 {
 101         struct ieee80211_local *local = sdata->local;
 102         struct ieee80211_sub_if_data *nsdata;
 103         struct net_device *dev = sdata->dev;
 104
 105         ASSERT_RTNL();
 106
 107         /* we hold the RTNL here so can safely walk the list */
 108         list_for_each_entry(nsdata, &local->interfaces, list) {
 109                 struct net_device *ndev = nsdata->dev;
 110
 111                 if (ndev != dev && ieee80211_sdata_running(nsdata)) {
 112                         /*
 113                          * Allow only a single IBSS interface to be up at any
 114                          * time. This is restricted because beacon distribution
 115                          * cannot work properly if both are in the same IBSS.
 116                          *
 117                          * To remove this restriction we'd have to disallow them
 118                          * from setting the same SSID on different IBSS interfaces
 119                          * belonging to the same hardware. Then, however, we're
 120                          * faced with having to adopt two different TSF timers...
 121                          */
 122                         if (iftype == NL80211_IFTYPE_ADHOC &&
 123                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 124                                 return -EBUSY;
 125
 126                         /*
 127                          * The remaining checks are only performed for interfaces
 128                          * with the same MAC address.
 129                          */
 130                         if (compare_ether_addr(dev->dev_addr, ndev->dev_addr))
 131                                 continue;
 132
 133                         /*
 134                          * check whether it may have the same address
 135                          */
 136                         if (!identical_mac_addr_allowed(iftype,
 137                                                         nsdata->vif.type))
 138                                 return -ENOTUNIQ;
 139
 140                         /*
 141                          * can only add VLANs to enabled APs
 142                          */
 143                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 144                             nsdata->vif.type == NL80211_IFTYPE_AP)
 145                                 sdata->bss = &nsdata->u.ap;
 146                 }
 147         }
 148
 149         return 0;
 150 }
 151
 152 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
 153 {
 154         int n_queues = sdata->local->hw.queues;
 155         int i;
 156
 157         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 158                 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 159                                  IEEE80211_INVAL_HW_QUEUE))
 160                         return -EINVAL;
 161                 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 162                                  n_queues))
 163                         return -EINVAL;
 164         }
 165
 166         if (sdata->vif.type != NL80211_IFTYPE_AP) {
 167                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 168                 return 0;
 169         }
 170
 171         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 172                 return -EINVAL;
 173
 174         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 175                 return -EINVAL;
 176
 177         return 0;
 178 }
 179
 180 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 181                                     const int offset)
 182 {
 183         struct ieee80211_local *local = sdata->local;
 184         u32 flags = sdata->u.mntr_flags;
 185
 186 #define ADJUST(_f, _s)  do {                                    \
 187         if (flags & MONITOR_FLAG_##_f)                          \
 188                 local->fif_##_s += offset;                      \
 189         } while (0)
 190
 191         ADJUST(FCSFAIL, fcsfail);
 192         ADJUST(PLCPFAIL, plcpfail);
 193         ADJUST(CONTROL, control);
 194         ADJUST(CONTROL, pspoll);
 195         ADJUST(OTHER_BSS, other_bss);
 196
 197 #undef ADJUST
 198 }
 199
 200 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 201 {
 202         struct ieee80211_local *local = sdata->local;
 203         int i;
 204
 205         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 206                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
 207                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 208                 else
 209                         sdata->vif.hw_queue[i] = i;
 210         }
 211         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 212 }
 213
 214 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 215 {
 216         struct ieee80211_sub_if_data *sdata;
 217         int ret;
 218
 219         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 220                 return 0;
 221
 222         if (local->monitor_sdata)
 223                 return 0;
 224
 225         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 226         if (!sdata)
 227                 return -ENOMEM;
 228
 229         /* set up data */
 230         sdata->local = local;
 231         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 232         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 233                  wiphy_name(local->hw.wiphy));
 234
 235         ieee80211_set_default_queues(sdata);
 236
 237         ret = drv_add_interface(local, sdata);
 238         if (WARN_ON(ret)) {
 239                 /* ok .. stupid driver, it asked for this! */
 240                 kfree(sdata);
 241                 return ret;
 242         }
 243
 244         ret = ieee80211_check_queues(sdata);
 245         if (ret) {
 246                 kfree(sdata);
 247                 return ret;
 248         }
 249
 250         rcu_assign_pointer(local->monitor_sdata, sdata);
 251
 252         return 0;
 253 }
 254
 255 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 256 {
 257         struct ieee80211_sub_if_data *sdata;
 258
 259         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 260                 return;
 261
 262         sdata = rtnl_dereference(local->monitor_sdata);
 263
 264         if (!sdata)
 265                 return;
 266
 267         rcu_assign_pointer(local->monitor_sdata, NULL);
 268         synchronize_net();
 269
 270         drv_remove_interface(local, sdata);
 271
 272         kfree(sdata);
 273 }
 274
 275 /*
 276  * NOTE: Be very careful when changing this function, it must NOT return
 277  * an error on interface type changes that have been pre-checked, so most
 278  * checks should be in ieee80211_check_concurrent_iface.
 279  */
 280 static int ieee80211_do_open(struct net_device *dev, bool coming_up)
 281 {
 282         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 283         struct ieee80211_local *local = sdata->local;
 284         struct sta_info *sta;
 285         u32 changed = 0;
 286         int res;
 287         u32 hw_reconf_flags = 0;
 288
 289         switch (sdata->vif.type) {
 290         case NL80211_IFTYPE_WDS:
 291                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 292                         return -ENOLINK;
 293                 break;
 294         case NL80211_IFTYPE_AP_VLAN: {
 295                 struct ieee80211_sub_if_data *master;
 296
 297                 if (!sdata->bss)
 298                         return -ENOLINK;
 299
 300                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 301
 302                 master = container_of(sdata->bss,
 303                                       struct ieee80211_sub_if_data, u.ap);
 304                 sdata->control_port_protocol =
 305                         master->control_port_protocol;
 306                 sdata->control_port_no_encrypt =
 307                         master->control_port_no_encrypt;
 308                 break;
 309                 }
 310         case NL80211_IFTYPE_AP:
 311                 sdata->bss = &sdata->u.ap;
 312                 break;
 313         case NL80211_IFTYPE_MESH_POINT:
 314         case NL80211_IFTYPE_STATION:
 315         case NL80211_IFTYPE_MONITOR:
 316         case NL80211_IFTYPE_ADHOC:
 317                 /* no special treatment */
 318                 break;
 319         case NL80211_IFTYPE_UNSPECIFIED:
 320         case NUM_NL80211_IFTYPES:
 321         case NL80211_IFTYPE_P2P_CLIENT:
 322         case NL80211_IFTYPE_P2P_GO:
 323                 /* cannot happen */
 324                 WARN_ON(1);
 325                 break;
 326         }
 327
 328         if (local->open_count == 0) {
 329                 res = drv_start(local);
 330                 if (res)
 331                         goto err_del_bss;
 332                 if (local->ops->napi_poll)
 333                         napi_enable(&local->napi);
 334                 /* we're brought up, everything changes */
 335                 hw_reconf_flags = ~0;
 336                 ieee80211_led_radio(local, true);
 337                 ieee80211_mod_tpt_led_trig(local,
 338                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 339         }
 340
 341         /*
 342          * Copy the hopefully now-present MAC address to
 343          * this interface, if it has the special null one.
 344          */
 345         if (is_zero_ether_addr(dev->dev_addr)) {
 346                 memcpy(dev->dev_addr,
 347                        local->hw.wiphy->perm_addr,
 348                        ETH_ALEN);
 349                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 350
 351                 if (!is_valid_ether_addr(dev->dev_addr)) {
 352                         if (!local->open_count)
 353                                 drv_stop(local);
 354                         return -EADDRNOTAVAIL;
 355                 }
 356         }
 357
 358         switch (sdata->vif.type) {
 359         case NL80211_IFTYPE_AP_VLAN:
 360                 /* no need to tell driver, but set carrier */
 361                 if (rtnl_dereference(sdata->bss->beacon))
 362                         netif_carrier_on(dev);
 363                 else
 364                         netif_carrier_off(dev);
 365                 break;
 366         case NL80211_IFTYPE_MONITOR:
 367                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 368                         local->cooked_mntrs++;
 369                         break;
 370                 }
 371
 372                 if (local->monitors == 0 && local->open_count == 0) {
 373                         res = ieee80211_add_virtual_monitor(local);
 374                         if (res)
 375                                 goto err_stop;
 376                 }
 377
 378                 /* must be before the call to ieee80211_configure_filter */
 379                 local->monitors++;
 380                 if (local->monitors == 1) {
 381                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 382                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 383                 }
 384
 385                 ieee80211_adjust_monitor_flags(sdata, 1);
 386                 ieee80211_configure_filter(local);
 387
 388                 netif_carrier_on(dev);
 389                 break;
 390         default:
 391                 if (coming_up) {
 392                         ieee80211_del_virtual_monitor(local);
 393
 394                         res = drv_add_interface(local, sdata);
 395                         if (res)
 396                                 goto err_stop;
 397                         res = ieee80211_check_queues(sdata);
 398                         if (res)
 399                                 goto err_del_interface;
 400                 }
 401
 402                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 403                         local->fif_pspoll++;
 404                         local->fif_probe_req++;
 405
 406                         ieee80211_configure_filter(local);
 407                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 408                         local->fif_probe_req++;
 409                 }
 410
 411                 changed |= ieee80211_reset_erp_info(sdata);
 412                 ieee80211_bss_info_change_notify(sdata, changed);
 413
 414                 if (sdata->vif.type == NL80211_IFTYPE_STATION ||
 415                     sdata->vif.type == NL80211_IFTYPE_ADHOC ||
 416                     sdata->vif.type == NL80211_IFTYPE_AP)
 417                         netif_carrier_off(dev);
 418                 else
 419                         netif_carrier_on(dev);
 420
 421                 /*
 422                  * set default queue parameters so drivers don't
 423                  * need to initialise the hardware if the hardware
 424                  * doesn't start up with sane defaults
 425                  */
 426                 ieee80211_set_wmm_default(sdata, true);
 427         }
 428
 429         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 430
 431         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 432                 /* Create STA entry for the WDS peer */
 433                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 434                                      GFP_KERNEL);
 435                 if (!sta) {
 436                         res = -ENOMEM;
 437                         goto err_del_interface;
 438                 }
 439
 440                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 441                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 442                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 443
 444                 res = sta_info_insert(sta);
 445                 if (res) {
 446                         /* STA has been freed */
 447                         goto err_del_interface;
 448                 }
 449
 450                 rate_control_rate_init(sta);
 451         }
 452
 453         /*
 454          * set_multicast_list will be invoked by the networking core
 455          * which will check whether any increments here were done in
 456          * error and sync them down to the hardware as filter flags.
 457          */
 458         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 459                 atomic_inc(&local->iff_allmultis);
 460
 461         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 462                 atomic_inc(&local->iff_promiscs);
 463
 464         mutex_lock(&local->mtx);
 465         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 466         mutex_unlock(&local->mtx);
 467
 468         if (coming_up)
 469                 local->open_count++;
 470
 471         if (hw_reconf_flags)
 472                 ieee80211_hw_config(local, hw_reconf_flags);
 473
 474         ieee80211_recalc_ps(local, -1);
 475
 476         netif_tx_start_all_queues(dev);
 477
 478         return 0;
 479  err_del_interface:
 480         drv_remove_interface(local, sdata);
 481  err_stop:
 482         if (!local->open_count)
 483                 drv_stop(local);
 484  err_del_bss:
 485         sdata->bss = NULL;
 486         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 487                 list_del(&sdata->u.vlan.list);
 488         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 489         return res;
 490 }
 491
 492 static int ieee80211_open(struct net_device *dev)
 493 {
 494         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 495         int err;
 496
 497         /* fail early if user set an invalid address */
 498         if (!is_valid_ether_addr(dev->dev_addr))
 499                 return -EADDRNOTAVAIL;
 500
 501         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 502         if (err)
 503                 return err;
 504
 505         return ieee80211_do_open(dev, true);
 506 }
 507
 508 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 509                               bool going_down)
 510 {
 511         struct ieee80211_local *local = sdata->local;
 512         unsigned long flags;
 513         struct sk_buff *skb, *tmp;
 514         u32 hw_reconf_flags = 0;
 515         int i;
 516         enum nl80211_channel_type orig_ct;
 517
 518         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 519
 520         if (local->scan_sdata == sdata)
 521                 ieee80211_scan_cancel(local);
 522
 523         /*
 524          * Stop TX on this interface first.
 525          */
 526         netif_tx_stop_all_queues(sdata->dev);
 527
 528         /*
 529          * Purge work for this interface.
 530          */
 531         ieee80211_work_purge(sdata);
 532
 533         /*
 534          * Remove all stations associated with this interface.
 535          *
 536          * This must be done before calling ops->remove_interface()
 537          * because otherwise we can later invoke ops->sta_notify()
 538          * whenever the STAs are removed, and that invalidates driver
 539          * assumptions about always getting a vif pointer that is valid
 540          * (because if we remove a STA after ops->remove_interface()
 541          * the driver will have removed the vif info already!)
 542          *
 543          * This is relevant only in AP, WDS and mesh modes, since in
 544          * all other modes we've already removed all stations when
 545          * disconnecting etc.
 546          */
 547         sta_info_flush(local, sdata);
 548
 549         /*
 550          * Don't count this interface for promisc/allmulti while it
 551          * is down. dev_mc_unsync() will invoke set_multicast_list
 552          * on the master interface which will sync these down to the
 553          * hardware as filter flags.
 554          */
 555         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 556                 atomic_dec(&local->iff_allmultis);
 557
 558         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 559                 atomic_dec(&local->iff_promiscs);
 560
 561         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 562                 local->fif_pspoll--;
 563                 local->fif_probe_req--;
 564         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 565                 local->fif_probe_req--;
 566         }
 567
 568         netif_addr_lock_bh(sdata->dev);
 569         spin_lock_bh(&local->filter_lock);
 570         __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 571                          sdata->dev->addr_len);
 572         spin_unlock_bh(&local->filter_lock);
 573         netif_addr_unlock_bh(sdata->dev);
 574
 575         ieee80211_configure_filter(local);
 576
 577         del_timer_sync(&local->dynamic_ps_timer);
 578         cancel_work_sync(&local->dynamic_ps_enable_work);
 579
 580         /* APs need special treatment */
 581         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 582                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 583                 struct beacon_data *old_beacon =
 584                         rtnl_dereference(sdata->u.ap.beacon);
 585                 struct sk_buff *old_probe_resp =
 586                         rtnl_dereference(sdata->u.ap.probe_resp);
 587
 588                 /* sdata_running will return false, so this will disable */
 589                 ieee80211_bss_info_change_notify(sdata,
 590                                                  BSS_CHANGED_BEACON_ENABLED);
 591
 592                 /* remove beacon and probe response */
 593                 RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
 594                 RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL);
 595                 synchronize_rcu();
 596                 kfree(old_beacon);
 597                 kfree_skb(old_probe_resp);
 598
 599                 /* down all dependent devices, that is VLANs */
 600                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 601                                          u.vlan.list)
 602                         dev_close(vlan->dev);
 603                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 604
 605                 /* free all potentially still buffered bcast frames */
 606                 local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf);
 607                 skb_queue_purge(&sdata->u.ap.ps_bc_buf);
 608         }
 609
 610         if (going_down)
 611                 local->open_count--;
 612
 613         switch (sdata->vif.type) {
 614         case NL80211_IFTYPE_AP_VLAN:
 615                 list_del(&sdata->u.vlan.list);
 616                 /* no need to tell driver */
 617                 break;
 618         case NL80211_IFTYPE_MONITOR:
 619                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 620                         local->cooked_mntrs--;
 621                         break;
 622                 }
 623
 624                 local->monitors--;
 625                 if (local->monitors == 0) {
 626                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 627                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 628                         ieee80211_del_virtual_monitor(local);
 629                 }
 630
 631                 ieee80211_adjust_monitor_flags(sdata, -1);
 632                 ieee80211_configure_filter(local);
 633                 break;
 634         default:
 635                 flush_work(&sdata->work);
 636                 /*
 637                  * When we get here, the interface is marked down.
 638                  * Call synchronize_rcu() to wait for the RX path
 639                  * should it be using the interface and enqueuing
 640                  * frames at this very time on another CPU.
 641                  */
 642                 synchronize_rcu();
 643                 skb_queue_purge(&sdata->skb_queue);
 644
 645                 /*
 646                  * Disable beaconing here for mesh only, AP and IBSS
 647                  * are already taken care of.
 648                  */
 649                 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
 650                         ieee80211_bss_info_change_notify(sdata,
 651                                 BSS_CHANGED_BEACON_ENABLED);
 652
 653                 /*
 654                  * Free all remaining keys, there shouldn't be any,
 655                  * except maybe group keys in AP more or WDS?
 656                  */
 657                 ieee80211_free_keys(sdata);
 658
 659                 if (going_down)
 660                         drv_remove_interface(local, sdata);
 661         }
 662
 663         sdata->bss = NULL;
 664
 665         mutex_lock(&local->mtx);
 666         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 667         mutex_unlock(&local->mtx);
 668
 669         ieee80211_recalc_ps(local, -1);
 670
 671         if (local->open_count == 0) {
 672                 if (local->ops->napi_poll)
 673                         napi_disable(&local->napi);
 674                 ieee80211_clear_tx_pending(local);
 675                 ieee80211_stop_device(local);
 676
 677                 /* no reconfiguring after stop! */
 678                 hw_reconf_flags = 0;
 679         }
 680
 681         /* Re-calculate channel-type, in case there are multiple vifs
 682          * on different channel types.
 683          */
 684         orig_ct = local->_oper_channel_type;
 685         ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT);
 686
 687         /* do after stop to avoid reconfiguring when we stop anyway */
 688         if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
 689                 ieee80211_hw_config(local, hw_reconf_flags);
 690
 691         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 692         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 693                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 694                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 695                         if (info->control.vif == &sdata->vif) {
 696                                 __skb_unlink(skb, &local->pending[i]);
 697                                 dev_kfree_skb_irq(skb);
 698                         }
 699                 }
 700         }
 701         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 702
 703         if (local->monitors == local->open_count && local->monitors > 0)
 704                 ieee80211_add_virtual_monitor(local);
 705 }
 706
 707 static int ieee80211_stop(struct net_device *dev)
 708 {
 709         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 710
 711         ieee80211_do_stop(sdata, true);
 712
 713         return 0;
 714 }
 715
 716 static void ieee80211_set_multicast_list(struct net_device *dev)
 717 {
 718         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 719         struct ieee80211_local *local = sdata->local;
 720         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 721
 722         allmulti = !!(dev->flags & IFF_ALLMULTI);
 723         promisc = !!(dev->flags & IFF_PROMISC);
 724         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 725         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 726
 727         if (allmulti != sdata_allmulti) {
 728                 if (dev->flags & IFF_ALLMULTI)
 729                         atomic_inc(&local->iff_allmultis);
 730                 else
 731                         atomic_dec(&local->iff_allmultis);
 732                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 733         }
 734
 735         if (promisc != sdata_promisc) {
 736                 if (dev->flags & IFF_PROMISC)
 737                         atomic_inc(&local->iff_promiscs);
 738                 else
 739                         atomic_dec(&local->iff_promiscs);
 740                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 741         }
 742         spin_lock_bh(&local->filter_lock);
 743         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 744         spin_unlock_bh(&local->filter_lock);
 745         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 746 }
 747
 748 /*
 749  * Called when the netdev is removed or, by the code below, before
 750  * the interface type changes.
 751  */
 752 static void ieee80211_teardown_sdata(struct net_device *dev)
 753 {
 754         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 755         struct ieee80211_local *local = sdata->local;
 756         int flushed;
 757         int i;
 758
 759         /* free extra data */
 760         ieee80211_free_keys(sdata);
 761
 762         ieee80211_debugfs_remove_netdev(sdata);
 763
 764         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 765                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 766         sdata->fragment_next = 0;
 767
 768         if (ieee80211_vif_is_mesh(&sdata->vif))
 769                 mesh_rmc_free(sdata);
 770         else if (sdata->vif.type == NL80211_IFTYPE_STATION)
 771                 ieee80211_mgd_teardown(sdata);
 772
 773         flushed = sta_info_flush(local, sdata);
 774         WARN_ON(flushed);
 775 }
 776
 777 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 778                                          struct sk_buff *skb)
 779 {
 780         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 781 }
 782
 783 static const struct net_device_ops ieee80211_dataif_ops = {
 784         .ndo_open               = ieee80211_open,
 785         .ndo_stop               = ieee80211_stop,
 786         .ndo_uninit             = ieee80211_teardown_sdata,
 787         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 788         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 789         .ndo_change_mtu         = ieee80211_change_mtu,
 790         .ndo_set_mac_address    = ieee80211_change_mac,
 791         .ndo_select_queue       = ieee80211_netdev_select_queue,
 792 };
 793
 794 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 795                                           struct sk_buff *skb)
 796 {
 797         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 798         struct ieee80211_local *local = sdata->local;
 799         struct ieee80211_hdr *hdr;
 800         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 801
 802         if (local->hw.queues < IEEE80211_NUM_ACS)
 803                 return 0;
 804
 805         if (skb->len < 4 ||
 806             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 807                 return 0; /* doesn't matter, frame will be dropped */
 808
 809         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 810
 811         return ieee80211_select_queue_80211(local, skb, hdr);
 812 }
 813
 814 static const struct net_device_ops ieee80211_monitorif_ops = {
 815         .ndo_open               = ieee80211_open,
 816         .ndo_stop               = ieee80211_stop,
 817         .ndo_uninit             = ieee80211_teardown_sdata,
 818         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 819         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 820         .ndo_change_mtu         = ieee80211_change_mtu,
 821         .ndo_set_mac_address    = eth_mac_addr,
 822         .ndo_select_queue       = ieee80211_monitor_select_queue,
 823 };
 824
 825 static void ieee80211_if_setup(struct net_device *dev)
 826 {
 827         ether_setup(dev);
 828         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
 829         dev->netdev_ops = &ieee80211_dataif_ops;
 830         dev->destructor = free_netdev;
 831 }
 832
 833 static void ieee80211_iface_work(struct work_struct *work)
 834 {
 835         struct ieee80211_sub_if_data *sdata =
 836                 container_of(work, struct ieee80211_sub_if_data, work);
 837         struct ieee80211_local *local = sdata->local;
 838         struct sk_buff *skb;
 839         struct sta_info *sta;
 840         struct ieee80211_ra_tid *ra_tid;
 841
 842         if (!ieee80211_sdata_running(sdata))
 843                 return;
 844
 845         if (local->scanning)
 846                 return;
 847
 848         /*
 849          * ieee80211_queue_work() should have picked up most cases,
 850          * here we'll pick the rest.
 851          */
 852         if (WARN(local->suspended,
 853                  "interface work scheduled while going to suspend\n"))
 854                 return;
 855
 856         /* first process frames */
 857         while ((skb = skb_dequeue(&sdata->skb_queue))) {
 858                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
 859
 860                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
 861                         ra_tid = (void *)&skb->cb;
 862                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
 863                                                  ra_tid->tid);
 864                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
 865                         ra_tid = (void *)&skb->cb;
 866                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
 867                                                 ra_tid->tid);
 868                 } else if (ieee80211_is_action(mgmt->frame_control) &&
 869                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
 870                         int len = skb->len;
 871
 872                         mutex_lock(&local->sta_mtx);
 873                         sta = sta_info_get_bss(sdata, mgmt->sa);
 874                         if (sta) {
 875                                 switch (mgmt->u.action.u.addba_req.action_code) {
 876                                 case WLAN_ACTION_ADDBA_REQ:
 877                                         ieee80211_process_addba_request(
 878                                                         local, sta, mgmt, len);
 879                                         break;
 880                                 case WLAN_ACTION_ADDBA_RESP:
 881                                         ieee80211_process_addba_resp(local, sta,
 882                                                                      mgmt, len);
 883                                         break;
 884                                 case WLAN_ACTION_DELBA:
 885                                         ieee80211_process_delba(sdata, sta,
 886                                                                 mgmt, len);
 887                                         break;
 888                                 default:
 889                                         WARN_ON(1);
 890                                         break;
 891                                 }
 892                         }
 893                         mutex_unlock(&local->sta_mtx);
 894                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
 895                         struct ieee80211_hdr *hdr = (void *)mgmt;
 896                         /*
 897                          * So the frame isn't mgmt, but frame_control
 898                          * is at the right place anyway, of course, so
 899                          * the if statement is correct.
 900                          *
 901                          * Warn if we have other data frame types here,
 902                          * they must not get here.
 903                          */
 904                         WARN_ON(hdr->frame_control &
 905                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
 906                         WARN_ON(!(hdr->seq_ctrl &
 907                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
 908                         /*
 909                          * This was a fragment of a frame, received while
 910                          * a block-ack session was active. That cannot be
 911                          * right, so terminate the session.
 912                          */
 913                         mutex_lock(&local->sta_mtx);
 914                         sta = sta_info_get_bss(sdata, mgmt->sa);
 915                         if (sta) {
 916                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
 917                                                 IEEE80211_QOS_CTL_TID_MASK;
 918
 919                                 __ieee80211_stop_rx_ba_session(
 920                                         sta, tid, WLAN_BACK_RECIPIENT,
 921                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
 922                                         true);
 923                         }
 924                         mutex_unlock(&local->sta_mtx);
 925                 } else switch (sdata->vif.type) {
 926                 case NL80211_IFTYPE_STATION:
 927                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
 928                         break;
 929                 case NL80211_IFTYPE_ADHOC:
 930                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
 931                         break;
 932                 case NL80211_IFTYPE_MESH_POINT:
 933                         if (!ieee80211_vif_is_mesh(&sdata->vif))
 934                                 break;
 935                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
 936                         break;
 937                 default:
 938                         WARN(1, "frame for unexpected interface type");
 939                         break;
 940                 }
 941
 942                 kfree_skb(skb);
 943         }
 944
 945         /* then other type-dependent work */
 946         switch (sdata->vif.type) {
 947         case NL80211_IFTYPE_STATION:
 948                 ieee80211_sta_work(sdata);
 949                 break;
 950         case NL80211_IFTYPE_ADHOC:
 951                 ieee80211_ibss_work(sdata);
 952                 break;
 953         case NL80211_IFTYPE_MESH_POINT:
 954                 if (!ieee80211_vif_is_mesh(&sdata->vif))
 955                         break;
 956                 ieee80211_mesh_work(sdata);
 957                 break;
 958         default:
 959                 break;
 960         }
 961 }
 962
 963
 964 /*
 965  * Helper function to initialise an interface to a specific type.
 966  */
 967 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
 968                                   enum nl80211_iftype type)
 969 {
 970         /* clear type-dependent union */
 971         memset(&sdata->u, 0, sizeof(sdata->u));
 972
 973         /* and set some type-dependent values */
 974         sdata->vif.type = type;
 975         sdata->vif.p2p = false;
 976         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
 977         sdata->wdev.iftype = type;
 978
 979         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
 980         sdata->control_port_no_encrypt = false;
 981
 982         sdata->noack_map = 0;
 983
 984         /* only monitor differs */
 985         sdata->dev->type = ARPHRD_ETHER;
 986
 987         skb_queue_head_init(&sdata->skb_queue);
 988         INIT_WORK(&sdata->work, ieee80211_iface_work);
 989
 990         switch (type) {
 991         case NL80211_IFTYPE_P2P_GO:
 992                 type = NL80211_IFTYPE_AP;
 993                 sdata->vif.type = type;
 994                 sdata->vif.p2p = true;
 995                 /* fall through */
 996         case NL80211_IFTYPE_AP:
 997                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
 998                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
 999                 break;
1000         case NL80211_IFTYPE_P2P_CLIENT:
1001                 type = NL80211_IFTYPE_STATION;
1002                 sdata->vif.type = type;
1003                 sdata->vif.p2p = true;
1004                 /* fall through */
1005         case NL80211_IFTYPE_STATION:
1006                 ieee80211_sta_setup_sdata(sdata);
1007                 break;
1008         case NL80211_IFTYPE_ADHOC:
1009                 ieee80211_ibss_setup_sdata(sdata);
1010                 break;
1011         case NL80211_IFTYPE_MESH_POINT:
1012                 if (ieee80211_vif_is_mesh(&sdata->vif))
1013                         ieee80211_mesh_init_sdata(sdata);
1014                 break;
1015         case NL80211_IFTYPE_MONITOR:
1016                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1017                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1018                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1019                                       MONITOR_FLAG_OTHER_BSS;
1020                 break;
1021         case NL80211_IFTYPE_WDS:
1022         case NL80211_IFTYPE_AP_VLAN:
1023                 break;
1024         case NL80211_IFTYPE_UNSPECIFIED:
1025         case NUM_NL80211_IFTYPES:
1026                 BUG();
1027                 break;
1028         }
1029
1030         ieee80211_debugfs_add_netdev(sdata);
1031 }
1032
1033 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1034                                            enum nl80211_iftype type)
1035 {
1036         struct ieee80211_local *local = sdata->local;
1037         int ret, err;
1038         enum nl80211_iftype internal_type = type;
1039         bool p2p = false;
1040
1041         ASSERT_RTNL();
1042
1043         if (!local->ops->change_interface)
1044                 return -EBUSY;
1045
1046         switch (sdata->vif.type) {
1047         case NL80211_IFTYPE_AP:
1048         case NL80211_IFTYPE_STATION:
1049         case NL80211_IFTYPE_ADHOC:
1050                 /*
1051                  * Could maybe also all others here?
1052                  * Just not sure how that interacts
1053                  * with the RX/config path e.g. for
1054                  * mesh.
1055                  */
1056                 break;
1057         default:
1058                 return -EBUSY;
1059         }
1060
1061         switch (type) {
1062         case NL80211_IFTYPE_AP:
1063         case NL80211_IFTYPE_STATION:
1064         case NL80211_IFTYPE_ADHOC:
1065                 /*
1066                  * Could probably support everything
1067                  * but WDS here (WDS do_open can fail
1068                  * under memory pressure, which this
1069                  * code isn't prepared to handle).
1070                  */
1071                 break;
1072         case NL80211_IFTYPE_P2P_CLIENT:
1073                 p2p = true;
1074                 internal_type = NL80211_IFTYPE_STATION;
1075                 break;
1076         case NL80211_IFTYPE_P2P_GO:
1077                 p2p = true;
1078                 internal_type = NL80211_IFTYPE_AP;
1079                 break;
1080         default:
1081                 return -EBUSY;
1082         }
1083
1084         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1085         if (ret)
1086                 return ret;
1087
1088         ieee80211_do_stop(sdata, false);
1089
1090         ieee80211_teardown_sdata(sdata->dev);
1091
1092         ret = drv_change_interface(local, sdata, internal_type, p2p);
1093         if (ret)
1094                 type = sdata->vif.type;
1095
1096         /*
1097          * Ignore return value here, there's not much we can do since
1098          * the driver changed the interface type internally already.
1099          * The warnings will hopefully make driver authors fix it :-)
1100          */
1101         ieee80211_check_queues(sdata);
1102
1103         ieee80211_setup_sdata(sdata, type);
1104
1105         err = ieee80211_do_open(sdata->dev, false);
1106         WARN(err, "type change: do_open returned %d", err);
1107
1108         return ret;
1109 }
1110
1111 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1112                              enum nl80211_iftype type)
1113 {
1114         int ret;
1115
1116         ASSERT_RTNL();
1117
1118         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1119                 return 0;
1120
1121         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
1122         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
1123             type == NL80211_IFTYPE_ADHOC)
1124                 return -EOPNOTSUPP;
1125
1126         if (ieee80211_sdata_running(sdata)) {
1127                 ret = ieee80211_runtime_change_iftype(sdata, type);
1128                 if (ret)
1129                         return ret;
1130         } else {
1131                 /* Purge and reset type-dependent state. */
1132                 ieee80211_teardown_sdata(sdata->dev);
1133                 ieee80211_setup_sdata(sdata, type);
1134         }
1135
1136         /* reset some values that shouldn't be kept across type changes */
1137         sdata->vif.bss_conf.basic_rates =
1138                 ieee80211_mandatory_rates(sdata->local,
1139                         sdata->local->hw.conf.channel->band);
1140         sdata->drop_unencrypted = 0;
1141         if (type == NL80211_IFTYPE_STATION)
1142                 sdata->u.mgd.use_4addr = false;
1143
1144         return 0;
1145 }
1146
1147 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1148                                        struct net_device *dev,
1149                                        enum nl80211_iftype type)
1150 {
1151         struct ieee80211_sub_if_data *sdata;
1152         u64 mask, start, addr, val, inc;
1153         u8 *m;
1154         u8 tmp_addr[ETH_ALEN];
1155         int i;
1156
1157         /* default ... something at least */
1158         memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1159
1160         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1161             local->hw.wiphy->n_addresses <= 1)
1162                 return;
1163
1164
1165         mutex_lock(&local->iflist_mtx);
1166
1167         switch (type) {
1168         case NL80211_IFTYPE_MONITOR:
1169                 /* doesn't matter */
1170                 break;
1171         case NL80211_IFTYPE_WDS:
1172         case NL80211_IFTYPE_AP_VLAN:
1173                 /* match up with an AP interface */
1174                 list_for_each_entry(sdata, &local->interfaces, list) {
1175                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1176                                 continue;
1177                         memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1178                         break;
1179                 }
1180                 /* keep default if no AP interface present */
1181                 break;
1182         default:
1183                 /* assign a new address if possible -- try n_addresses first */
1184                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1185                         bool used = false;
1186
1187                         list_for_each_entry(sdata, &local->interfaces, list) {
1188                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1189                                            sdata->vif.addr, ETH_ALEN) == 0) {
1190                                         used = true;
1191                                         break;
1192                                 }
1193                         }
1194
1195                         if (!used) {
1196                                 memcpy(dev->perm_addr,
1197                                        local->hw.wiphy->addresses[i].addr,
1198                                        ETH_ALEN);
1199                                 break;
1200                         }
1201                 }
1202
1203                 /* try mask if available */
1204                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1205                         break;
1206
1207                 m = local->hw.wiphy->addr_mask;
1208                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1209                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1210                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1211
1212                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1213                         /* not a contiguous mask ... not handled now! */
1214                         printk(KERN_DEBUG "not contiguous\n");
1215                         break;
1216                 }
1217
1218                 m = local->hw.wiphy->perm_addr;
1219                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1220                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1221                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1222
1223                 inc = 1ULL<<__ffs64(mask);
1224                 val = (start & mask);
1225                 addr = (start & ~mask) | (val & mask);
1226                 do {
1227                         bool used = false;
1228
1229                         tmp_addr[5] = addr >> 0*8;
1230                         tmp_addr[4] = addr >> 1*8;
1231                         tmp_addr[3] = addr >> 2*8;
1232                         tmp_addr[2] = addr >> 3*8;
1233                         tmp_addr[1] = addr >> 4*8;
1234                         tmp_addr[0] = addr >> 5*8;
1235
1236                         val += inc;
1237
1238                         list_for_each_entry(sdata, &local->interfaces, list) {
1239                                 if (memcmp(tmp_addr, sdata->vif.addr,
1240                                                         ETH_ALEN) == 0) {
1241                                         used = true;
1242                                         break;
1243                                 }
1244                         }
1245
1246                         if (!used) {
1247                                 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1248                                 break;
1249                         }
1250                         addr = (start & ~mask) | (val & mask);
1251                 } while (addr != start);
1252
1253                 break;
1254         }
1255
1256         mutex_unlock(&local->iflist_mtx);
1257 }
1258
1259 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1260                      struct net_device **new_dev, enum nl80211_iftype type,
1261                      struct vif_params *params)
1262 {
1263         struct net_device *ndev;
1264         struct ieee80211_sub_if_data *sdata = NULL;
1265         int ret, i;
1266         int txqs = 1;
1267
1268         ASSERT_RTNL();
1269
1270         if (local->hw.queues >= IEEE80211_NUM_ACS)
1271                 txqs = IEEE80211_NUM_ACS;
1272
1273         ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1274                                 name, ieee80211_if_setup, txqs, 1);
1275         if (!ndev)
1276                 return -ENOMEM;
1277         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1278
1279         ndev->needed_headroom = local->tx_headroom +
1280                                 4*6 /* four MAC addresses */
1281                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1282                                 + 6 /* mesh */
1283                                 + 8 /* rfc1042/bridge tunnel */
1284                                 - ETH_HLEN /* ethernet hard_header_len */
1285                                 + IEEE80211_ENCRYPT_HEADROOM;
1286         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1287
1288         ret = dev_alloc_name(ndev, ndev->name);
1289         if (ret < 0)
1290                 goto fail;
1291
1292         ieee80211_assign_perm_addr(local, ndev, type);
1293         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1294         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1295
1296         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1297         sdata = netdev_priv(ndev);
1298         ndev->ieee80211_ptr = &sdata->wdev;
1299         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1300         memcpy(sdata->name, ndev->name, IFNAMSIZ);
1301
1302         /* initialise type-independent data */
1303         sdata->wdev.wiphy = local->hw.wiphy;
1304         sdata->local = local;
1305         sdata->dev = ndev;
1306 #ifdef CONFIG_INET
1307         sdata->arp_filter_state = true;
1308 #endif
1309
1310         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1311                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1312
1313         INIT_LIST_HEAD(&sdata->key_list);
1314
1315         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1316                 struct ieee80211_supported_band *sband;
1317                 sband = local->hw.wiphy->bands[i];
1318                 sdata->rc_rateidx_mask[i] =
1319                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1320                 if (sband)
1321                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1322                                sband->ht_cap.mcs.rx_mask,
1323                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1324                 else
1325                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1326                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1327         }
1328
1329         ieee80211_set_default_queues(sdata);
1330
1331         /* setup type-dependent data */
1332         ieee80211_setup_sdata(sdata, type);
1333
1334         if (params) {
1335                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1336                 if (type == NL80211_IFTYPE_STATION)
1337                         sdata->u.mgd.use_4addr = params->use_4addr;
1338         }
1339
1340         ret = register_netdevice(ndev);
1341         if (ret)
1342                 goto fail;
1343
1344         mutex_lock(&local->iflist_mtx);
1345         list_add_tail_rcu(&sdata->list, &local->interfaces);
1346         mutex_unlock(&local->iflist_mtx);
1347
1348         if (new_dev)
1349                 *new_dev = ndev;
1350
1351         return 0;
1352
1353  fail:
1354         free_netdev(ndev);
1355         return ret;
1356 }
1357
1358 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1359 {
1360         ASSERT_RTNL();
1361
1362         mutex_lock(&sdata->local->iflist_mtx);
1363         list_del_rcu(&sdata->list);
1364         mutex_unlock(&sdata->local->iflist_mtx);
1365
1366         if (ieee80211_vif_is_mesh(&sdata->vif))
1367                 mesh_path_flush_by_iface(sdata);
1368
1369         synchronize_rcu();
1370         unregister_netdevice(sdata->dev);
1371 }
1372
1373 /*
1374  * Remove all interfaces, may only be called at hardware unregistration
1375  * time because it doesn't do RCU-safe list removals.
1376  */
1377 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1378 {
1379         struct ieee80211_sub_if_data *sdata, *tmp;
1380         LIST_HEAD(unreg_list);
1381
1382         ASSERT_RTNL();
1383
1384         mutex_lock(&local->iflist_mtx);
1385         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1386                 list_del(&sdata->list);
1387
1388                 if (ieee80211_vif_is_mesh(&sdata->vif))
1389                         mesh_path_flush_by_iface(sdata);
1390
1391                 unregister_netdevice_queue(sdata->dev, &unreg_list);
1392         }
1393         mutex_unlock(&local->iflist_mtx);
1394         unregister_netdevice_many(&unreg_list);
1395         list_del(&unreg_list);
1396 }
1397
1398 static u32 ieee80211_idle_off(struct ieee80211_local *local,
1399                               const char *reason)
1400 {
1401         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
1402                 return 0;
1403
1404 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1405         wiphy_debug(local->hw.wiphy, "device no longer idle - %s\n", reason);
1406 #endif
1407
1408         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
1409         return IEEE80211_CONF_CHANGE_IDLE;
1410 }
1411
1412 static u32 ieee80211_idle_on(struct ieee80211_local *local)
1413 {
1414         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
1415                 return 0;
1416
1417 #ifdef CONFIG_MAC80211_VERBOSE_DEBUG
1418         wiphy_debug(local->hw.wiphy, "device now idle\n");
1419 #endif
1420
1421         drv_flush(local, false);
1422
1423         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
1424         return IEEE80211_CONF_CHANGE_IDLE;
1425 }
1426
1427 u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
1428 {
1429         struct ieee80211_sub_if_data *sdata;
1430         int count = 0;
1431         bool working = false, scanning = false, hw_roc = false;
1432         struct ieee80211_work *wk;
1433         unsigned int led_trig_start = 0, led_trig_stop = 0;
1434
1435 #ifdef CONFIG_PROVE_LOCKING
1436         WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
1437                 !lockdep_is_held(&local->iflist_mtx));
1438 #endif
1439         lockdep_assert_held(&local->mtx);
1440
1441         list_for_each_entry(sdata, &local->interfaces, list) {
1442                 if (!ieee80211_sdata_running(sdata)) {
1443                         sdata->vif.bss_conf.idle = true;
1444                         continue;
1445                 }
1446
1447                 sdata->old_idle = sdata->vif.bss_conf.idle;
1448
1449                 /* do not count disabled managed interfaces */
1450                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
1451                     !sdata->u.mgd.associated &&
1452                     !sdata->u.mgd.auth_data &&
1453                     !sdata->u.mgd.assoc_data) {
1454                         sdata->vif.bss_conf.idle = true;
1455                         continue;
1456                 }
1457                 /* do not count unused IBSS interfaces */
1458                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
1459                     !sdata->u.ibss.ssid_len) {
1460                         sdata->vif.bss_conf.idle = true;
1461                         continue;
1462                 }
1463                 /* count everything else */
1464                 sdata->vif.bss_conf.idle = false;
1465                 count++;
1466         }
1467
1468         list_for_each_entry(wk, &local->work_list, list) {
1469                 working = true;
1470                 wk->sdata->vif.bss_conf.idle = false;
1471         }
1472
1473         if (local->scan_sdata &&
1474             !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
1475                 scanning = true;
1476                 local->scan_sdata->vif.bss_conf.idle = false;
1477         }
1478
1479         if (local->hw_roc_channel)
1480                 hw_roc = true;
1481
1482         list_for_each_entry(sdata, &local->interfaces, list) {
1483                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1484                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1485                         continue;
1486                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
1487                         continue;
1488                 if (!ieee80211_sdata_running(sdata))
1489                         continue;
1490                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
1491         }
1492
1493         if (working || scanning || hw_roc)
1494                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1495         else
1496                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
1497
1498         if (count)
1499                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1500         else
1501                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
1502
1503         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
1504
1505         if (hw_roc)
1506                 return ieee80211_idle_off(local, "hw remain-on-channel");
1507         if (working)
1508                 return ieee80211_idle_off(local, "working");
1509         if (scanning)
1510                 return ieee80211_idle_off(local, "scanning");
1511         if (!count)
1512                 return ieee80211_idle_on(local);
1513         else
1514                 return ieee80211_idle_off(local, "in use");
1515
1516         return 0;
1517 }
1518
1519 void ieee80211_recalc_idle(struct ieee80211_local *local)
1520 {
1521         u32 chg;
1522
1523         mutex_lock(&local->iflist_mtx);
1524         chg = __ieee80211_recalc_idle(local);
1525         mutex_unlock(&local->iflist_mtx);
1526         if (chg)
1527                 ieee80211_hw_config(local, chg);
1528 }
1529
1530 static int netdev_notify(struct notifier_block *nb,
1531                          unsigned long state,
1532                          void *ndev)
1533 {
1534         struct net_device *dev = ndev;
1535         struct ieee80211_sub_if_data *sdata;
1536
1537         if (state != NETDEV_CHANGENAME)
1538                 return 0;
1539
1540         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1541                 return 0;
1542
1543         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1544                 return 0;
1545
1546         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1547
1548         memcpy(sdata->name, dev->name, IFNAMSIZ);
1549
1550         ieee80211_debugfs_rename_netdev(sdata);
1551         return 0;
1552 }
1553
1554 static struct notifier_block mac80211_netdev_notifier = {
1555         .notifier_call = netdev_notify,
1556 };
1557
1558 int ieee80211_iface_init(void)
1559 {
1560         return register_netdevice_notifier(&mac80211_netdev_notifier);
1561 }
1562
1563 void ieee80211_iface_exit(void)
1564 {
1565         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1566 }