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