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 u32 ieee80211_idle_off(struct ieee80211_local *local,
  47                               const char *reason)
  48 {
  49         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  50                 return 0;
  51
  52         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  53         return IEEE80211_CONF_CHANGE_IDLE;
  54 }
  55
  56 static u32 ieee80211_idle_on(struct ieee80211_local *local)
  57 {
  58         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  59                 return 0;
  60
  61         drv_flush(local, false);
  62
  63         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
  64         return IEEE80211_CONF_CHANGE_IDLE;
  65 }
  66
  67 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
  68 {
  69         struct ieee80211_sub_if_data *sdata;
  70         int count = 0;
  71         bool working = false, scanning = false;
  72         unsigned int led_trig_start = 0, led_trig_stop = 0;
  73         struct ieee80211_roc_work *roc;
  74
  75 #ifdef CONFIG_PROVE_LOCKING
  76         WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
  77                 !lockdep_is_held(&local->iflist_mtx));
  78 #endif
  79         lockdep_assert_held(&local->mtx);
  80
  81         list_for_each_entry(sdata, &local->interfaces, list) {
  82                 if (!ieee80211_sdata_running(sdata)) {
  83                         sdata->vif.bss_conf.idle = true;
  84                         continue;
  85                 }
  86
  87                 sdata->old_idle = sdata->vif.bss_conf.idle;
  88
  89                 /* do not count disabled managed interfaces */
  90                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
  91                     !sdata->u.mgd.associated &&
  92                     !sdata->u.mgd.auth_data &&
  93                     !sdata->u.mgd.assoc_data) {
  94                         sdata->vif.bss_conf.idle = true;
  95                         continue;
  96                 }
  97                 /* do not count unused IBSS interfaces */
  98                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
  99                     !sdata->u.ibss.ssid_len) {
 100                         sdata->vif.bss_conf.idle = true;
 101                         continue;
 102                 }
 103                 /* count everything else */
 104                 sdata->vif.bss_conf.idle = false;
 105                 count++;
 106         }
 107
 108         if (!local->ops->remain_on_channel) {
 109                 list_for_each_entry(roc, &local->roc_list, list) {
 110                         working = true;
 111                         roc->sdata->vif.bss_conf.idle = false;
 112                 }
 113         }
 114
 115         sdata = rcu_dereference_protected(local->scan_sdata,
 116                                           lockdep_is_held(&local->mtx));
 117         if (sdata && !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
 118                 scanning = true;
 119                 sdata->vif.bss_conf.idle = false;
 120         }
 121
 122         list_for_each_entry(sdata, &local->interfaces, list) {
 123                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 124                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 125                         continue;
 126                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
 127                         continue;
 128                 if (!ieee80211_sdata_running(sdata))
 129                         continue;
 130                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
 131         }
 132
 133         if (working || scanning)
 134                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 135         else
 136                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 137
 138         if (count)
 139                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 140         else
 141                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 142
 143         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 144
 145         if (working)
 146                 return ieee80211_idle_off(local, "working");
 147         if (scanning)
 148                 return ieee80211_idle_off(local, "scanning");
 149         if (!count)
 150                 return ieee80211_idle_on(local);
 151         else
 152                 return ieee80211_idle_off(local, "in use");
 153
 154         return 0;
 155 }
 156
 157 void ieee80211_recalc_idle(struct ieee80211_local *local)
 158 {
 159         u32 chg;
 160
 161         mutex_lock(&local->iflist_mtx);
 162         chg = __ieee80211_recalc_idle(local);
 163         mutex_unlock(&local->iflist_mtx);
 164         if (chg)
 165                 ieee80211_hw_config(local, chg);
 166 }
 167
 168 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 169 {
 170         int meshhdrlen;
 171         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 172
 173         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
 174
 175         /* FIX: what would be proper limits for MTU?
 176          * This interface uses 802.3 frames. */
 177         if (new_mtu < 256 ||
 178             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
 179                 return -EINVAL;
 180         }
 181
 182         dev->mtu = new_mtu;
 183         return 0;
 184 }
 185
 186 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 187 {
 188         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 189         struct sockaddr *sa = addr;
 190         int ret;
 191
 192         if (ieee80211_sdata_running(sdata))
 193                 return -EBUSY;
 194
 195         ret = eth_mac_addr(dev, sa);
 196
 197         if (ret == 0)
 198                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 199
 200         return ret;
 201 }
 202
 203 static inline int identical_mac_addr_allowed(int type1, int type2)
 204 {
 205         return type1 == NL80211_IFTYPE_MONITOR ||
 206                 type2 == NL80211_IFTYPE_MONITOR ||
 207                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 208                 (type1 == NL80211_IFTYPE_WDS &&
 209                         (type2 == NL80211_IFTYPE_WDS ||
 210                          type2 == NL80211_IFTYPE_AP)) ||
 211                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 212                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 213                         (type2 == NL80211_IFTYPE_AP ||
 214                          type2 == NL80211_IFTYPE_AP_VLAN));
 215 }
 216
 217 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 218                                             enum nl80211_iftype iftype)
 219 {
 220         struct ieee80211_local *local = sdata->local;
 221         struct ieee80211_sub_if_data *nsdata;
 222
 223         ASSERT_RTNL();
 224
 225         /* we hold the RTNL here so can safely walk the list */
 226         list_for_each_entry(nsdata, &local->interfaces, list) {
 227                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 228                         /*
 229                          * Allow only a single IBSS interface to be up at any
 230                          * time. This is restricted because beacon distribution
 231                          * cannot work properly if both are in the same IBSS.
 232                          *
 233                          * To remove this restriction we'd have to disallow them
 234                          * from setting the same SSID on different IBSS interfaces
 235                          * belonging to the same hardware. Then, however, we're
 236                          * faced with having to adopt two different TSF timers...
 237                          */
 238                         if (iftype == NL80211_IFTYPE_ADHOC &&
 239                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 240                                 return -EBUSY;
 241
 242                         /*
 243                          * The remaining checks are only performed for interfaces
 244                          * with the same MAC address.
 245                          */
 246                         if (!ether_addr_equal(sdata->vif.addr,
 247                                               nsdata->vif.addr))
 248                                 continue;
 249
 250                         /*
 251                          * check whether it may have the same address
 252                          */
 253                         if (!identical_mac_addr_allowed(iftype,
 254                                                         nsdata->vif.type))
 255                                 return -ENOTUNIQ;
 256
 257                         /*
 258                          * can only add VLANs to enabled APs
 259                          */
 260                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 261                             nsdata->vif.type == NL80211_IFTYPE_AP)
 262                                 sdata->bss = &nsdata->u.ap;
 263                 }
 264         }
 265
 266         return 0;
 267 }
 268
 269 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
 270 {
 271         int n_queues = sdata->local->hw.queues;
 272         int i;
 273
 274         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 275                 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 276                                  IEEE80211_INVAL_HW_QUEUE))
 277                         return -EINVAL;
 278                 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 279                                  n_queues))
 280                         return -EINVAL;
 281         }
 282
 283         if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
 284             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
 285                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 286                 return 0;
 287         }
 288
 289         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 290                 return -EINVAL;
 291
 292         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 293                 return -EINVAL;
 294
 295         return 0;
 296 }
 297
 298 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 299                                     const int offset)
 300 {
 301         struct ieee80211_local *local = sdata->local;
 302         u32 flags = sdata->u.mntr_flags;
 303
 304 #define ADJUST(_f, _s)  do {                                    \
 305         if (flags & MONITOR_FLAG_##_f)                          \
 306                 local->fif_##_s += offset;                      \
 307         } while (0)
 308
 309         ADJUST(FCSFAIL, fcsfail);
 310         ADJUST(PLCPFAIL, plcpfail);
 311         ADJUST(CONTROL, control);
 312         ADJUST(CONTROL, pspoll);
 313         ADJUST(OTHER_BSS, other_bss);
 314
 315 #undef ADJUST
 316 }
 317
 318 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 319 {
 320         struct ieee80211_local *local = sdata->local;
 321         int i;
 322
 323         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 324                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
 325                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 326                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 327                         sdata->vif.hw_queue[i] = i;
 328                 else
 329                         sdata->vif.hw_queue[i] = 0;
 330         }
 331         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 332 }
 333
 334 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 335 {
 336         struct ieee80211_sub_if_data *sdata;
 337         int ret = 0;
 338
 339         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 340                 return 0;
 341
 342         mutex_lock(&local->iflist_mtx);
 343
 344         if (local->monitor_sdata)
 345                 goto out_unlock;
 346
 347         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 348         if (!sdata) {
 349                 ret = -ENOMEM;
 350                 goto out_unlock;
 351         }
 352
 353         /* set up data */
 354         sdata->local = local;
 355         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 356         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 357                  wiphy_name(local->hw.wiphy));
 358
 359         ieee80211_set_default_queues(sdata);
 360
 361         ret = drv_add_interface(local, sdata);
 362         if (WARN_ON(ret)) {
 363                 /* ok .. stupid driver, it asked for this! */
 364                 kfree(sdata);
 365                 goto out_unlock;
 366         }
 367
 368         ret = ieee80211_check_queues(sdata);
 369         if (ret) {
 370                 kfree(sdata);
 371                 goto out_unlock;
 372         }
 373
 374         rcu_assign_pointer(local->monitor_sdata, sdata);
 375  out_unlock:
 376         mutex_unlock(&local->iflist_mtx);
 377         return ret;
 378 }
 379
 380 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 381 {
 382         struct ieee80211_sub_if_data *sdata;
 383
 384         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 385                 return;
 386
 387         mutex_lock(&local->iflist_mtx);
 388
 389         sdata = rcu_dereference_protected(local->monitor_sdata,
 390                                           lockdep_is_held(&local->iflist_mtx));
 391         if (!sdata)
 392                 goto out_unlock;
 393
 394         rcu_assign_pointer(local->monitor_sdata, NULL);
 395         synchronize_net();
 396
 397         drv_remove_interface(local, sdata);
 398
 399         kfree(sdata);
 400  out_unlock:
 401         mutex_unlock(&local->iflist_mtx);
 402 }
 403
 404 /*
 405  * NOTE: Be very careful when changing this function, it must NOT return
 406  * an error on interface type changes that have been pre-checked, so most
 407  * checks should be in ieee80211_check_concurrent_iface.
 408  */
 409 static int ieee80211_do_open(struct net_device *dev, bool coming_up)
 410 {
 411         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 412         struct ieee80211_local *local = sdata->local;
 413         struct sta_info *sta;
 414         u32 changed = 0;
 415         int res;
 416         u32 hw_reconf_flags = 0;
 417
 418         switch (sdata->vif.type) {
 419         case NL80211_IFTYPE_WDS:
 420                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 421                         return -ENOLINK;
 422                 break;
 423         case NL80211_IFTYPE_AP_VLAN: {
 424                 struct ieee80211_sub_if_data *master;
 425
 426                 if (!sdata->bss)
 427                         return -ENOLINK;
 428
 429                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 430
 431                 master = container_of(sdata->bss,
 432                                       struct ieee80211_sub_if_data, u.ap);
 433                 sdata->control_port_protocol =
 434                         master->control_port_protocol;
 435                 sdata->control_port_no_encrypt =
 436                         master->control_port_no_encrypt;
 437                 break;
 438                 }
 439         case NL80211_IFTYPE_AP:
 440                 sdata->bss = &sdata->u.ap;
 441                 break;
 442         case NL80211_IFTYPE_MESH_POINT:
 443         case NL80211_IFTYPE_STATION:
 444         case NL80211_IFTYPE_MONITOR:
 445         case NL80211_IFTYPE_ADHOC:
 446                 /* no special treatment */
 447                 break;
 448         case NL80211_IFTYPE_UNSPECIFIED:
 449         case NUM_NL80211_IFTYPES:
 450         case NL80211_IFTYPE_P2P_CLIENT:
 451         case NL80211_IFTYPE_P2P_GO:
 452                 /* cannot happen */
 453                 WARN_ON(1);
 454                 break;
 455         }
 456
 457         if (local->open_count == 0) {
 458                 res = drv_start(local);
 459                 if (res)
 460                         goto err_del_bss;
 461                 if (local->ops->napi_poll)
 462                         napi_enable(&local->napi);
 463                 /* we're brought up, everything changes */
 464                 hw_reconf_flags = ~0;
 465                 ieee80211_led_radio(local, true);
 466                 ieee80211_mod_tpt_led_trig(local,
 467                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 468         }
 469
 470         /*
 471          * Copy the hopefully now-present MAC address to
 472          * this interface, if it has the special null one.
 473          */
 474         if (is_zero_ether_addr(dev->dev_addr)) {
 475                 memcpy(dev->dev_addr,
 476                        local->hw.wiphy->perm_addr,
 477                        ETH_ALEN);
 478                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 479
 480                 if (!is_valid_ether_addr(dev->dev_addr)) {
 481                         res = -EADDRNOTAVAIL;
 482                         goto err_stop;
 483                 }
 484         }
 485
 486         switch (sdata->vif.type) {
 487         case NL80211_IFTYPE_AP_VLAN:
 488                 /* no need to tell driver, but set carrier */
 489                 if (rtnl_dereference(sdata->bss->beacon))
 490                         netif_carrier_on(dev);
 491                 else
 492                         netif_carrier_off(dev);
 493                 break;
 494         case NL80211_IFTYPE_MONITOR:
 495                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 496                         local->cooked_mntrs++;
 497                         break;
 498                 }
 499
 500                 if (local->monitors == 0 && local->open_count == 0) {
 501                         res = ieee80211_add_virtual_monitor(local);
 502                         if (res)
 503                                 goto err_stop;
 504                 }
 505
 506                 /* must be before the call to ieee80211_configure_filter */
 507                 local->monitors++;
 508                 if (local->monitors == 1) {
 509                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 510                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 511                 }
 512
 513                 ieee80211_adjust_monitor_flags(sdata, 1);
 514                 ieee80211_configure_filter(local);
 515
 516                 netif_carrier_on(dev);
 517                 break;
 518         default:
 519                 if (coming_up) {
 520                         ieee80211_del_virtual_monitor(local);
 521
 522                         res = drv_add_interface(local, sdata);
 523                         if (res)
 524                                 goto err_stop;
 525                         res = ieee80211_check_queues(sdata);
 526                         if (res)
 527                                 goto err_del_interface;
 528                 }
 529
 530                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 531                         local->fif_pspoll++;
 532                         local->fif_probe_req++;
 533
 534                         ieee80211_configure_filter(local);
 535                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 536                         local->fif_probe_req++;
 537                 }
 538
 539                 changed |= ieee80211_reset_erp_info(sdata);
 540                 ieee80211_bss_info_change_notify(sdata, changed);
 541
 542                 if (sdata->vif.type == NL80211_IFTYPE_STATION ||
 543                     sdata->vif.type == NL80211_IFTYPE_ADHOC ||
 544                     sdata->vif.type == NL80211_IFTYPE_AP)
 545                         netif_carrier_off(dev);
 546                 else
 547                         netif_carrier_on(dev);
 548
 549                 /*
 550                  * set default queue parameters so drivers don't
 551                  * need to initialise the hardware if the hardware
 552                  * doesn't start up with sane defaults
 553                  */
 554                 ieee80211_set_wmm_default(sdata, true);
 555         }
 556
 557         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 558
 559         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 560                 /* Create STA entry for the WDS peer */
 561                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 562                                      GFP_KERNEL);
 563                 if (!sta) {
 564                         res = -ENOMEM;
 565                         goto err_del_interface;
 566                 }
 567
 568                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 569                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 570                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 571
 572                 res = sta_info_insert(sta);
 573                 if (res) {
 574                         /* STA has been freed */
 575                         goto err_del_interface;
 576                 }
 577
 578                 rate_control_rate_init(sta);
 579         }
 580
 581         /*
 582          * set_multicast_list will be invoked by the networking core
 583          * which will check whether any increments here were done in
 584          * error and sync them down to the hardware as filter flags.
 585          */
 586         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 587                 atomic_inc(&local->iff_allmultis);
 588
 589         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 590                 atomic_inc(&local->iff_promiscs);
 591
 592         mutex_lock(&local->mtx);
 593         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 594         mutex_unlock(&local->mtx);
 595
 596         if (coming_up)
 597                 local->open_count++;
 598
 599         if (hw_reconf_flags)
 600                 ieee80211_hw_config(local, hw_reconf_flags);
 601
 602         ieee80211_recalc_ps(local, -1);
 603
 604         netif_tx_start_all_queues(dev);
 605
 606         return 0;
 607  err_del_interface:
 608         drv_remove_interface(local, sdata);
 609  err_stop:
 610         if (!local->open_count)
 611                 drv_stop(local);
 612  err_del_bss:
 613         sdata->bss = NULL;
 614         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 615                 list_del(&sdata->u.vlan.list);
 616         /* might already be clear but that doesn't matter */
 617         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 618         return res;
 619 }
 620
 621 static int ieee80211_open(struct net_device *dev)
 622 {
 623         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 624         int err;
 625
 626         /* fail early if user set an invalid address */
 627         if (!is_valid_ether_addr(dev->dev_addr))
 628                 return -EADDRNOTAVAIL;
 629
 630         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 631         if (err)
 632                 return err;
 633
 634         return ieee80211_do_open(dev, true);
 635 }
 636
 637 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 638                               bool going_down)
 639 {
 640         struct ieee80211_local *local = sdata->local;
 641         unsigned long flags;
 642         struct sk_buff *skb, *tmp;
 643         u32 hw_reconf_flags = 0;
 644         int i;
 645         enum nl80211_channel_type orig_ct;
 646
 647         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 648
 649         if (rcu_access_pointer(local->scan_sdata) == sdata)
 650                 ieee80211_scan_cancel(local);
 651
 652         /*
 653          * Stop TX on this interface first.
 654          */
 655         netif_tx_stop_all_queues(sdata->dev);
 656
 657         ieee80211_roc_purge(sdata);
 658
 659         /*
 660          * Remove all stations associated with this interface.
 661          *
 662          * This must be done before calling ops->remove_interface()
 663          * because otherwise we can later invoke ops->sta_notify()
 664          * whenever the STAs are removed, and that invalidates driver
 665          * assumptions about always getting a vif pointer that is valid
 666          * (because if we remove a STA after ops->remove_interface()
 667          * the driver will have removed the vif info already!)
 668          *
 669          * This is relevant only in AP, WDS and mesh modes, since in
 670          * all other modes we've already removed all stations when
 671          * disconnecting etc.
 672          */
 673         sta_info_flush(local, sdata);
 674
 675         /*
 676          * Don't count this interface for promisc/allmulti while it
 677          * is down. dev_mc_unsync() will invoke set_multicast_list
 678          * on the master interface which will sync these down to the
 679          * hardware as filter flags.
 680          */
 681         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 682                 atomic_dec(&local->iff_allmultis);
 683
 684         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 685                 atomic_dec(&local->iff_promiscs);
 686
 687         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 688                 local->fif_pspoll--;
 689                 local->fif_probe_req--;
 690         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 691                 local->fif_probe_req--;
 692         }
 693
 694         netif_addr_lock_bh(sdata->dev);
 695         spin_lock_bh(&local->filter_lock);
 696         __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 697                          sdata->dev->addr_len);
 698         spin_unlock_bh(&local->filter_lock);
 699         netif_addr_unlock_bh(sdata->dev);
 700
 701         ieee80211_configure_filter(local);
 702
 703         del_timer_sync(&local->dynamic_ps_timer);
 704         cancel_work_sync(&local->dynamic_ps_enable_work);
 705
 706         /* APs need special treatment */
 707         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 708                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 709                 struct beacon_data *old_beacon =
 710                         rtnl_dereference(sdata->u.ap.beacon);
 711                 struct sk_buff *old_probe_resp =
 712                         rtnl_dereference(sdata->u.ap.probe_resp);
 713
 714                 /* sdata_running will return false, so this will disable */
 715                 ieee80211_bss_info_change_notify(sdata,
 716                                                  BSS_CHANGED_BEACON_ENABLED);
 717
 718                 /* remove beacon and probe response */
 719                 RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
 720                 RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL);
 721                 synchronize_rcu();
 722                 kfree(old_beacon);
 723                 kfree_skb(old_probe_resp);
 724
 725                 /* down all dependent devices, that is VLANs */
 726                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 727                                          u.vlan.list)
 728                         dev_close(vlan->dev);
 729                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 730
 731                 /* free all potentially still buffered bcast frames */
 732                 local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf);
 733                 skb_queue_purge(&sdata->u.ap.ps_bc_buf);
 734         } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 735                 ieee80211_mgd_stop(sdata);
 736         }
 737
 738         if (going_down)
 739                 local->open_count--;
 740
 741         switch (sdata->vif.type) {
 742         case NL80211_IFTYPE_AP_VLAN:
 743                 list_del(&sdata->u.vlan.list);
 744                 /* no need to tell driver */
 745                 break;
 746         case NL80211_IFTYPE_MONITOR:
 747                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 748                         local->cooked_mntrs--;
 749                         break;
 750                 }
 751
 752                 local->monitors--;
 753                 if (local->monitors == 0) {
 754                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 755                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 756                         ieee80211_del_virtual_monitor(local);
 757                 }
 758
 759                 ieee80211_adjust_monitor_flags(sdata, -1);
 760                 ieee80211_configure_filter(local);
 761                 break;
 762         default:
 763                 flush_work(&sdata->work);
 764                 /*
 765                  * When we get here, the interface is marked down.
 766                  * Call synchronize_rcu() to wait for the RX path
 767                  * should it be using the interface and enqueuing
 768                  * frames at this very time on another CPU.
 769                  */
 770                 synchronize_rcu();
 771                 skb_queue_purge(&sdata->skb_queue);
 772
 773                 /*
 774                  * Disable beaconing here for mesh only, AP and IBSS
 775                  * are already taken care of.
 776                  */
 777                 if (sdata->vif.type == NL80211_IFTYPE_MESH_POINT)
 778                         ieee80211_bss_info_change_notify(sdata,
 779                                 BSS_CHANGED_BEACON_ENABLED);
 780
 781                 /*
 782                  * Free all remaining keys, there shouldn't be any,
 783                  * except maybe group keys in AP more or WDS?
 784                  */
 785                 ieee80211_free_keys(sdata);
 786
 787                 if (going_down)
 788                         drv_remove_interface(local, sdata);
 789         }
 790
 791         sdata->bss = NULL;
 792
 793         mutex_lock(&local->mtx);
 794         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 795         mutex_unlock(&local->mtx);
 796
 797         ieee80211_recalc_ps(local, -1);
 798
 799         if (local->open_count == 0) {
 800                 if (local->ops->napi_poll)
 801                         napi_disable(&local->napi);
 802                 ieee80211_clear_tx_pending(local);
 803                 ieee80211_stop_device(local);
 804
 805                 /* no reconfiguring after stop! */
 806                 hw_reconf_flags = 0;
 807         }
 808
 809         /* Re-calculate channel-type, in case there are multiple vifs
 810          * on different channel types.
 811          */
 812         orig_ct = local->_oper_channel_type;
 813         ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT);
 814
 815         /* do after stop to avoid reconfiguring when we stop anyway */
 816         if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
 817                 ieee80211_hw_config(local, hw_reconf_flags);
 818
 819         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 820         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 821                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 822                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 823                         if (info->control.vif == &sdata->vif) {
 824                                 __skb_unlink(skb, &local->pending[i]);
 825                                 dev_kfree_skb_irq(skb);
 826                         }
 827                 }
 828         }
 829         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 830
 831         if (local->monitors == local->open_count && local->monitors > 0)
 832                 ieee80211_add_virtual_monitor(local);
 833 }
 834
 835 static int ieee80211_stop(struct net_device *dev)
 836 {
 837         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 838
 839         ieee80211_do_stop(sdata, true);
 840
 841         return 0;
 842 }
 843
 844 static void ieee80211_set_multicast_list(struct net_device *dev)
 845 {
 846         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 847         struct ieee80211_local *local = sdata->local;
 848         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 849
 850         allmulti = !!(dev->flags & IFF_ALLMULTI);
 851         promisc = !!(dev->flags & IFF_PROMISC);
 852         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 853         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 854
 855         if (allmulti != sdata_allmulti) {
 856                 if (dev->flags & IFF_ALLMULTI)
 857                         atomic_inc(&local->iff_allmultis);
 858                 else
 859                         atomic_dec(&local->iff_allmultis);
 860                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 861         }
 862
 863         if (promisc != sdata_promisc) {
 864                 if (dev->flags & IFF_PROMISC)
 865                         atomic_inc(&local->iff_promiscs);
 866                 else
 867                         atomic_dec(&local->iff_promiscs);
 868                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 869         }
 870         spin_lock_bh(&local->filter_lock);
 871         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 872         spin_unlock_bh(&local->filter_lock);
 873         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 874 }
 875
 876 /*
 877  * Called when the netdev is removed or, by the code below, before
 878  * the interface type changes.
 879  */
 880 static void ieee80211_teardown_sdata(struct net_device *dev)
 881 {
 882         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 883         struct ieee80211_local *local = sdata->local;
 884         int flushed;
 885         int i;
 886
 887         /* free extra data */
 888         ieee80211_free_keys(sdata);
 889
 890         ieee80211_debugfs_remove_netdev(sdata);
 891
 892         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 893                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 894         sdata->fragment_next = 0;
 895
 896         if (ieee80211_vif_is_mesh(&sdata->vif))
 897                 mesh_rmc_free(sdata);
 898
 899         flushed = sta_info_flush(local, sdata);
 900         WARN_ON(flushed);
 901 }
 902
 903 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 904                                          struct sk_buff *skb)
 905 {
 906         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 907 }
 908
 909 static const struct net_device_ops ieee80211_dataif_ops = {
 910         .ndo_open               = ieee80211_open,
 911         .ndo_stop               = ieee80211_stop,
 912         .ndo_uninit             = ieee80211_teardown_sdata,
 913         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 914         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 915         .ndo_change_mtu         = ieee80211_change_mtu,
 916         .ndo_set_mac_address    = ieee80211_change_mac,
 917         .ndo_select_queue       = ieee80211_netdev_select_queue,
 918 };
 919
 920 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 921                                           struct sk_buff *skb)
 922 {
 923         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 924         struct ieee80211_local *local = sdata->local;
 925         struct ieee80211_hdr *hdr;
 926         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 927
 928         if (local->hw.queues < IEEE80211_NUM_ACS)
 929                 return 0;
 930
 931         if (skb->len < 4 ||
 932             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 933                 return 0; /* doesn't matter, frame will be dropped */
 934
 935         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 936
 937         return ieee80211_select_queue_80211(sdata, skb, hdr);
 938 }
 939
 940 static const struct net_device_ops ieee80211_monitorif_ops = {
 941         .ndo_open               = ieee80211_open,
 942         .ndo_stop               = ieee80211_stop,
 943         .ndo_uninit             = ieee80211_teardown_sdata,
 944         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 945         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 946         .ndo_change_mtu         = ieee80211_change_mtu,
 947         .ndo_set_mac_address    = eth_mac_addr,
 948         .ndo_select_queue       = ieee80211_monitor_select_queue,
 949 };
 950
 951 static void ieee80211_if_setup(struct net_device *dev)
 952 {
 953         ether_setup(dev);
 954         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
 955         dev->netdev_ops = &ieee80211_dataif_ops;
 956         dev->destructor = free_netdev;
 957 }
 958
 959 static void ieee80211_iface_work(struct work_struct *work)
 960 {
 961         struct ieee80211_sub_if_data *sdata =
 962                 container_of(work, struct ieee80211_sub_if_data, work);
 963         struct ieee80211_local *local = sdata->local;
 964         struct sk_buff *skb;
 965         struct sta_info *sta;
 966         struct ieee80211_ra_tid *ra_tid;
 967
 968         if (!ieee80211_sdata_running(sdata))
 969                 return;
 970
 971         if (local->scanning)
 972                 return;
 973
 974         /*
 975          * ieee80211_queue_work() should have picked up most cases,
 976          * here we'll pick the rest.
 977          */
 978         if (WARN(local->suspended,
 979                  "interface work scheduled while going to suspend\n"))
 980                 return;
 981
 982         /* first process frames */
 983         while ((skb = skb_dequeue(&sdata->skb_queue))) {
 984                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
 985
 986                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
 987                         ra_tid = (void *)&skb->cb;
 988                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
 989                                                  ra_tid->tid);
 990                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
 991                         ra_tid = (void *)&skb->cb;
 992                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
 993                                                 ra_tid->tid);
 994                 } else if (ieee80211_is_action(mgmt->frame_control) &&
 995                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
 996                         int len = skb->len;
 997
 998                         mutex_lock(&local->sta_mtx);
 999                         sta = sta_info_get_bss(sdata, mgmt->sa);
1000                         if (sta) {
1001                                 switch (mgmt->u.action.u.addba_req.action_code) {
1002                                 case WLAN_ACTION_ADDBA_REQ:
1003                                         ieee80211_process_addba_request(
1004                                                         local, sta, mgmt, len);
1005                                         break;
1006                                 case WLAN_ACTION_ADDBA_RESP:
1007                                         ieee80211_process_addba_resp(local, sta,
1008                                                                      mgmt, len);
1009                                         break;
1010                                 case WLAN_ACTION_DELBA:
1011                                         ieee80211_process_delba(sdata, sta,
1012                                                                 mgmt, len);
1013                                         break;
1014                                 default:
1015                                         WARN_ON(1);
1016                                         break;
1017                                 }
1018                         }
1019                         mutex_unlock(&local->sta_mtx);
1020                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1021                         struct ieee80211_hdr *hdr = (void *)mgmt;
1022                         /*
1023                          * So the frame isn't mgmt, but frame_control
1024                          * is at the right place anyway, of course, so
1025                          * the if statement is correct.
1026                          *
1027                          * Warn if we have other data frame types here,
1028                          * they must not get here.
1029                          */
1030                         WARN_ON(hdr->frame_control &
1031                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1032                         WARN_ON(!(hdr->seq_ctrl &
1033                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1034                         /*
1035                          * This was a fragment of a frame, received while
1036                          * a block-ack session was active. That cannot be
1037                          * right, so terminate the session.
1038                          */
1039                         mutex_lock(&local->sta_mtx);
1040                         sta = sta_info_get_bss(sdata, mgmt->sa);
1041                         if (sta) {
1042                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1043                                                 IEEE80211_QOS_CTL_TID_MASK;
1044
1045                                 __ieee80211_stop_rx_ba_session(
1046                                         sta, tid, WLAN_BACK_RECIPIENT,
1047                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1048                                         true);
1049                         }
1050                         mutex_unlock(&local->sta_mtx);
1051                 } else switch (sdata->vif.type) {
1052                 case NL80211_IFTYPE_STATION:
1053                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1054                         break;
1055                 case NL80211_IFTYPE_ADHOC:
1056                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1057                         break;
1058                 case NL80211_IFTYPE_MESH_POINT:
1059                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1060                                 break;
1061                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1062                         break;
1063                 default:
1064                         WARN(1, "frame for unexpected interface type");
1065                         break;
1066                 }
1067
1068                 kfree_skb(skb);
1069         }
1070
1071         /* then other type-dependent work */
1072         switch (sdata->vif.type) {
1073         case NL80211_IFTYPE_STATION:
1074                 ieee80211_sta_work(sdata);
1075                 break;
1076         case NL80211_IFTYPE_ADHOC:
1077                 ieee80211_ibss_work(sdata);
1078                 break;
1079         case NL80211_IFTYPE_MESH_POINT:
1080                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1081                         break;
1082                 ieee80211_mesh_work(sdata);
1083                 break;
1084         default:
1085                 break;
1086         }
1087 }
1088
1089
1090 /*
1091  * Helper function to initialise an interface to a specific type.
1092  */
1093 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1094                                   enum nl80211_iftype type)
1095 {
1096         /* clear type-dependent union */
1097         memset(&sdata->u, 0, sizeof(sdata->u));
1098
1099         /* and set some type-dependent values */
1100         sdata->vif.type = type;
1101         sdata->vif.p2p = false;
1102         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1103         sdata->wdev.iftype = type;
1104
1105         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1106         sdata->control_port_no_encrypt = false;
1107
1108         sdata->noack_map = 0;
1109
1110         /* only monitor differs */
1111         sdata->dev->type = ARPHRD_ETHER;
1112
1113         skb_queue_head_init(&sdata->skb_queue);
1114         INIT_WORK(&sdata->work, ieee80211_iface_work);
1115
1116         switch (type) {
1117         case NL80211_IFTYPE_P2P_GO:
1118                 type = NL80211_IFTYPE_AP;
1119                 sdata->vif.type = type;
1120                 sdata->vif.p2p = true;
1121                 /* fall through */
1122         case NL80211_IFTYPE_AP:
1123                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
1124                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1125                 break;
1126         case NL80211_IFTYPE_P2P_CLIENT:
1127                 type = NL80211_IFTYPE_STATION;
1128                 sdata->vif.type = type;
1129                 sdata->vif.p2p = true;
1130                 /* fall through */
1131         case NL80211_IFTYPE_STATION:
1132                 ieee80211_sta_setup_sdata(sdata);
1133                 break;
1134         case NL80211_IFTYPE_ADHOC:
1135                 ieee80211_ibss_setup_sdata(sdata);
1136                 break;
1137         case NL80211_IFTYPE_MESH_POINT:
1138                 if (ieee80211_vif_is_mesh(&sdata->vif))
1139                         ieee80211_mesh_init_sdata(sdata);
1140                 break;
1141         case NL80211_IFTYPE_MONITOR:
1142                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1143                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1144                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1145                                       MONITOR_FLAG_OTHER_BSS;
1146                 break;
1147         case NL80211_IFTYPE_WDS:
1148         case NL80211_IFTYPE_AP_VLAN:
1149                 break;
1150         case NL80211_IFTYPE_UNSPECIFIED:
1151         case NUM_NL80211_IFTYPES:
1152                 BUG();
1153                 break;
1154         }
1155
1156         ieee80211_debugfs_add_netdev(sdata);
1157 }
1158
1159 static void ieee80211_clean_sdata(struct ieee80211_sub_if_data *sdata)
1160 {
1161         switch (sdata->vif.type) {
1162         case NL80211_IFTYPE_MESH_POINT:
1163                 mesh_path_flush_by_iface(sdata);
1164                 break;
1165
1166         default:
1167                 break;
1168         }
1169 }
1170
1171 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1172                                            enum nl80211_iftype type)
1173 {
1174         struct ieee80211_local *local = sdata->local;
1175         int ret, err;
1176         enum nl80211_iftype internal_type = type;
1177         bool p2p = false;
1178
1179         ASSERT_RTNL();
1180
1181         if (!local->ops->change_interface)
1182                 return -EBUSY;
1183
1184         switch (sdata->vif.type) {
1185         case NL80211_IFTYPE_AP:
1186         case NL80211_IFTYPE_STATION:
1187         case NL80211_IFTYPE_ADHOC:
1188                 /*
1189                  * Could maybe also all others here?
1190                  * Just not sure how that interacts
1191                  * with the RX/config path e.g. for
1192                  * mesh.
1193                  */
1194                 break;
1195         default:
1196                 return -EBUSY;
1197         }
1198
1199         switch (type) {
1200         case NL80211_IFTYPE_AP:
1201         case NL80211_IFTYPE_STATION:
1202         case NL80211_IFTYPE_ADHOC:
1203                 /*
1204                  * Could probably support everything
1205                  * but WDS here (WDS do_open can fail
1206                  * under memory pressure, which this
1207                  * code isn't prepared to handle).
1208                  */
1209                 break;
1210         case NL80211_IFTYPE_P2P_CLIENT:
1211                 p2p = true;
1212                 internal_type = NL80211_IFTYPE_STATION;
1213                 break;
1214         case NL80211_IFTYPE_P2P_GO:
1215                 p2p = true;
1216                 internal_type = NL80211_IFTYPE_AP;
1217                 break;
1218         default:
1219                 return -EBUSY;
1220         }
1221
1222         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1223         if (ret)
1224                 return ret;
1225
1226         ieee80211_do_stop(sdata, false);
1227
1228         ieee80211_teardown_sdata(sdata->dev);
1229
1230         ret = drv_change_interface(local, sdata, internal_type, p2p);
1231         if (ret)
1232                 type = sdata->vif.type;
1233
1234         /*
1235          * Ignore return value here, there's not much we can do since
1236          * the driver changed the interface type internally already.
1237          * The warnings will hopefully make driver authors fix it :-)
1238          */
1239         ieee80211_check_queues(sdata);
1240
1241         ieee80211_setup_sdata(sdata, type);
1242
1243         err = ieee80211_do_open(sdata->dev, false);
1244         WARN(err, "type change: do_open returned %d", err);
1245
1246         return ret;
1247 }
1248
1249 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1250                              enum nl80211_iftype type)
1251 {
1252         int ret;
1253
1254         ASSERT_RTNL();
1255
1256         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1257                 return 0;
1258
1259         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
1260         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
1261             type == NL80211_IFTYPE_ADHOC)
1262                 return -EOPNOTSUPP;
1263
1264         if (ieee80211_sdata_running(sdata)) {
1265                 ret = ieee80211_runtime_change_iftype(sdata, type);
1266                 if (ret)
1267                         return ret;
1268         } else {
1269                 /* Purge and reset type-dependent state. */
1270                 ieee80211_teardown_sdata(sdata->dev);
1271                 ieee80211_setup_sdata(sdata, type);
1272         }
1273
1274         /* reset some values that shouldn't be kept across type changes */
1275         sdata->vif.bss_conf.basic_rates =
1276                 ieee80211_mandatory_rates(sdata->local,
1277                         sdata->local->hw.conf.channel->band);
1278         sdata->drop_unencrypted = 0;
1279         if (type == NL80211_IFTYPE_STATION)
1280                 sdata->u.mgd.use_4addr = false;
1281
1282         return 0;
1283 }
1284
1285 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1286                                        struct net_device *dev,
1287                                        enum nl80211_iftype type)
1288 {
1289         struct ieee80211_sub_if_data *sdata;
1290         u64 mask, start, addr, val, inc;
1291         u8 *m;
1292         u8 tmp_addr[ETH_ALEN];
1293         int i;
1294
1295         /* default ... something at least */
1296         memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1297
1298         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1299             local->hw.wiphy->n_addresses <= 1)
1300                 return;
1301
1302
1303         mutex_lock(&local->iflist_mtx);
1304
1305         switch (type) {
1306         case NL80211_IFTYPE_MONITOR:
1307                 /* doesn't matter */
1308                 break;
1309         case NL80211_IFTYPE_WDS:
1310         case NL80211_IFTYPE_AP_VLAN:
1311                 /* match up with an AP interface */
1312                 list_for_each_entry(sdata, &local->interfaces, list) {
1313                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1314                                 continue;
1315                         memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1316                         break;
1317                 }
1318                 /* keep default if no AP interface present */
1319                 break;
1320         default:
1321                 /* assign a new address if possible -- try n_addresses first */
1322                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1323                         bool used = false;
1324
1325                         list_for_each_entry(sdata, &local->interfaces, list) {
1326                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1327                                            sdata->vif.addr, ETH_ALEN) == 0) {
1328                                         used = true;
1329                                         break;
1330                                 }
1331                         }
1332
1333                         if (!used) {
1334                                 memcpy(dev->perm_addr,
1335                                        local->hw.wiphy->addresses[i].addr,
1336                                        ETH_ALEN);
1337                                 break;
1338                         }
1339                 }
1340
1341                 /* try mask if available */
1342                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1343                         break;
1344
1345                 m = local->hw.wiphy->addr_mask;
1346                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1347                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1348                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1349
1350                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1351                         /* not a contiguous mask ... not handled now! */
1352                         pr_info("not contiguous\n");
1353                         break;
1354                 }
1355
1356                 m = local->hw.wiphy->perm_addr;
1357                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1358                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1359                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1360
1361                 inc = 1ULL<<__ffs64(mask);
1362                 val = (start & mask);
1363                 addr = (start & ~mask) | (val & mask);
1364                 do {
1365                         bool used = false;
1366
1367                         tmp_addr[5] = addr >> 0*8;
1368                         tmp_addr[4] = addr >> 1*8;
1369                         tmp_addr[3] = addr >> 2*8;
1370                         tmp_addr[2] = addr >> 3*8;
1371                         tmp_addr[1] = addr >> 4*8;
1372                         tmp_addr[0] = addr >> 5*8;
1373
1374                         val += inc;
1375
1376                         list_for_each_entry(sdata, &local->interfaces, list) {
1377                                 if (memcmp(tmp_addr, sdata->vif.addr,
1378                                                         ETH_ALEN) == 0) {
1379                                         used = true;
1380                                         break;
1381                                 }
1382                         }
1383
1384                         if (!used) {
1385                                 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1386                                 break;
1387                         }
1388                         addr = (start & ~mask) | (val & mask);
1389                 } while (addr != start);
1390
1391                 break;
1392         }
1393
1394         mutex_unlock(&local->iflist_mtx);
1395 }
1396
1397 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1398                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1399                      struct vif_params *params)
1400 {
1401         struct net_device *ndev;
1402         struct ieee80211_sub_if_data *sdata = NULL;
1403         int ret, i;
1404         int txqs = 1;
1405
1406         ASSERT_RTNL();
1407
1408         if (local->hw.queues >= IEEE80211_NUM_ACS)
1409                 txqs = IEEE80211_NUM_ACS;
1410
1411         ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1412                                 name, ieee80211_if_setup, txqs, 1);
1413         if (!ndev)
1414                 return -ENOMEM;
1415         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1416
1417         ndev->needed_headroom = local->tx_headroom +
1418                                 4*6 /* four MAC addresses */
1419                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1420                                 + 6 /* mesh */
1421                                 + 8 /* rfc1042/bridge tunnel */
1422                                 - ETH_HLEN /* ethernet hard_header_len */
1423                                 + IEEE80211_ENCRYPT_HEADROOM;
1424         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1425
1426         ret = dev_alloc_name(ndev, ndev->name);
1427         if (ret < 0)
1428                 goto fail;
1429
1430         ieee80211_assign_perm_addr(local, ndev, type);
1431         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1432         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1433
1434         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1435         sdata = netdev_priv(ndev);
1436         ndev->ieee80211_ptr = &sdata->wdev;
1437         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1438         memcpy(sdata->name, ndev->name, IFNAMSIZ);
1439
1440         /* initialise type-independent data */
1441         sdata->wdev.wiphy = local->hw.wiphy;
1442         sdata->local = local;
1443         sdata->dev = ndev;
1444 #ifdef CONFIG_INET
1445         sdata->arp_filter_state = true;
1446 #endif
1447
1448         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1449                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1450
1451         INIT_LIST_HEAD(&sdata->key_list);
1452
1453         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1454                 struct ieee80211_supported_band *sband;
1455                 sband = local->hw.wiphy->bands[i];
1456                 sdata->rc_rateidx_mask[i] =
1457                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1458                 if (sband)
1459                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1460                                sband->ht_cap.mcs.rx_mask,
1461                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1462                 else
1463                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1464                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1465         }
1466
1467         ieee80211_set_default_queues(sdata);
1468
1469         /* setup type-dependent data */
1470         ieee80211_setup_sdata(sdata, type);
1471
1472         if (params) {
1473                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1474                 if (type == NL80211_IFTYPE_STATION)
1475                         sdata->u.mgd.use_4addr = params->use_4addr;
1476         }
1477
1478         ndev->features |= local->hw.netdev_features;
1479
1480         ret = register_netdevice(ndev);
1481         if (ret)
1482                 goto fail;
1483
1484         mutex_lock(&local->iflist_mtx);
1485         list_add_tail_rcu(&sdata->list, &local->interfaces);
1486         mutex_unlock(&local->iflist_mtx);
1487
1488         if (new_wdev)
1489                 *new_wdev = &sdata->wdev;
1490
1491         return 0;
1492
1493  fail:
1494         free_netdev(ndev);
1495         return ret;
1496 }
1497
1498 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1499 {
1500         ASSERT_RTNL();
1501
1502         mutex_lock(&sdata->local->iflist_mtx);
1503         list_del_rcu(&sdata->list);
1504         mutex_unlock(&sdata->local->iflist_mtx);
1505
1506         /* clean up type-dependent data */
1507         ieee80211_clean_sdata(sdata);
1508
1509         synchronize_rcu();
1510         unregister_netdevice(sdata->dev);
1511 }
1512
1513 /*
1514  * Remove all interfaces, may only be called at hardware unregistration
1515  * time because it doesn't do RCU-safe list removals.
1516  */
1517 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1518 {
1519         struct ieee80211_sub_if_data *sdata, *tmp;
1520         LIST_HEAD(unreg_list);
1521
1522         ASSERT_RTNL();
1523
1524         mutex_lock(&local->iflist_mtx);
1525         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1526                 list_del(&sdata->list);
1527
1528                 ieee80211_clean_sdata(sdata);
1529
1530                 unregister_netdevice_queue(sdata->dev, &unreg_list);
1531         }
1532         mutex_unlock(&local->iflist_mtx);
1533         unregister_netdevice_many(&unreg_list);
1534         list_del(&unreg_list);
1535 }
1536
1537 static int netdev_notify(struct notifier_block *nb,
1538                          unsigned long state,
1539                          void *ndev)
1540 {
1541         struct net_device *dev = ndev;
1542         struct ieee80211_sub_if_data *sdata;
1543
1544         if (state != NETDEV_CHANGENAME)
1545                 return 0;
1546
1547         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1548                 return 0;
1549
1550         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1551                 return 0;
1552
1553         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1554
1555         memcpy(sdata->name, dev->name, IFNAMSIZ);
1556
1557         ieee80211_debugfs_rename_netdev(sdata);
1558         return 0;
1559 }
1560
1561 static struct notifier_block mac80211_netdev_notifier = {
1562         .notifier_call = netdev_notify,
1563 };
1564
1565 int ieee80211_iface_init(void)
1566 {
1567         return register_netdevice_notifier(&mac80211_netdev_notifier);
1568 }
1569
1570 void ieee80211_iface_exit(void)
1571 {
1572         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1573 }