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
 104                 if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
 105                         continue;
 106
 107                 /* count everything else */
 108                 sdata->vif.bss_conf.idle = false;
 109                 count++;
 110         }
 111
 112         if (!local->ops->remain_on_channel) {
 113                 list_for_each_entry(roc, &local->roc_list, list) {
 114                         working = true;
 115                         roc->sdata->vif.bss_conf.idle = false;
 116                 }
 117         }
 118
 119         sdata = rcu_dereference_protected(local->scan_sdata,
 120                                           lockdep_is_held(&local->mtx));
 121         if (sdata && !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
 122                 scanning = true;
 123                 sdata->vif.bss_conf.idle = false;
 124         }
 125
 126         list_for_each_entry(sdata, &local->interfaces, list) {
 127                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 128                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
 129                     sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
 130                         continue;
 131                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
 132                         continue;
 133                 if (!ieee80211_sdata_running(sdata))
 134                         continue;
 135                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
 136         }
 137
 138         if (working || scanning)
 139                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 140         else
 141                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 142
 143         if (count)
 144                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 145         else
 146                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 147
 148         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 149
 150         if (working)
 151                 return ieee80211_idle_off(local, "working");
 152         if (scanning)
 153                 return ieee80211_idle_off(local, "scanning");
 154         if (!count)
 155                 return ieee80211_idle_on(local);
 156         else
 157                 return ieee80211_idle_off(local, "in use");
 158
 159         return 0;
 160 }
 161
 162 void ieee80211_recalc_idle(struct ieee80211_local *local)
 163 {
 164         u32 chg;
 165
 166         mutex_lock(&local->iflist_mtx);
 167         chg = __ieee80211_recalc_idle(local);
 168         mutex_unlock(&local->iflist_mtx);
 169         if (chg)
 170                 ieee80211_hw_config(local, chg);
 171 }
 172
 173 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 174 {
 175         int meshhdrlen;
 176         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 177
 178         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
 179
 180         /* FIX: what would be proper limits for MTU?
 181          * This interface uses 802.3 frames. */
 182         if (new_mtu < 256 ||
 183             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
 184                 return -EINVAL;
 185         }
 186
 187         dev->mtu = new_mtu;
 188         return 0;
 189 }
 190
 191 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 192 {
 193         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 194         struct sockaddr *sa = addr;
 195         int ret;
 196
 197         if (ieee80211_sdata_running(sdata))
 198                 return -EBUSY;
 199
 200         ret = eth_mac_addr(dev, sa);
 201
 202         if (ret == 0)
 203                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 204
 205         return ret;
 206 }
 207
 208 static inline int identical_mac_addr_allowed(int type1, int type2)
 209 {
 210         return type1 == NL80211_IFTYPE_MONITOR ||
 211                 type2 == NL80211_IFTYPE_MONITOR ||
 212                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 213                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 214                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 215                 (type1 == NL80211_IFTYPE_WDS &&
 216                         (type2 == NL80211_IFTYPE_WDS ||
 217                          type2 == NL80211_IFTYPE_AP)) ||
 218                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 219                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 220                         (type2 == NL80211_IFTYPE_AP ||
 221                          type2 == NL80211_IFTYPE_AP_VLAN));
 222 }
 223
 224 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 225                                             enum nl80211_iftype iftype)
 226 {
 227         struct ieee80211_local *local = sdata->local;
 228         struct ieee80211_sub_if_data *nsdata;
 229
 230         ASSERT_RTNL();
 231
 232         /* we hold the RTNL here so can safely walk the list */
 233         list_for_each_entry(nsdata, &local->interfaces, list) {
 234                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 235                         /*
 236                          * Allow only a single IBSS interface to be up at any
 237                          * time. This is restricted because beacon distribution
 238                          * cannot work properly if both are in the same IBSS.
 239                          *
 240                          * To remove this restriction we'd have to disallow them
 241                          * from setting the same SSID on different IBSS interfaces
 242                          * belonging to the same hardware. Then, however, we're
 243                          * faced with having to adopt two different TSF timers...
 244                          */
 245                         if (iftype == NL80211_IFTYPE_ADHOC &&
 246                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 247                                 return -EBUSY;
 248
 249                         /*
 250                          * The remaining checks are only performed for interfaces
 251                          * with the same MAC address.
 252                          */
 253                         if (!ether_addr_equal(sdata->vif.addr,
 254                                               nsdata->vif.addr))
 255                                 continue;
 256
 257                         /*
 258                          * check whether it may have the same address
 259                          */
 260                         if (!identical_mac_addr_allowed(iftype,
 261                                                         nsdata->vif.type))
 262                                 return -ENOTUNIQ;
 263
 264                         /*
 265                          * can only add VLANs to enabled APs
 266                          */
 267                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 268                             nsdata->vif.type == NL80211_IFTYPE_AP)
 269                                 sdata->bss = &nsdata->u.ap;
 270                 }
 271         }
 272
 273         return 0;
 274 }
 275
 276 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
 277 {
 278         int n_queues = sdata->local->hw.queues;
 279         int i;
 280
 281         if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
 282                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 283                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 284                                          IEEE80211_INVAL_HW_QUEUE))
 285                                 return -EINVAL;
 286                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 287                                          n_queues))
 288                                 return -EINVAL;
 289                 }
 290         }
 291
 292         if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
 293             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
 294                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 295                 return 0;
 296         }
 297
 298         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 299                 return -EINVAL;
 300
 301         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 302                 return -EINVAL;
 303
 304         return 0;
 305 }
 306
 307 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 308                                     const int offset)
 309 {
 310         struct ieee80211_local *local = sdata->local;
 311         u32 flags = sdata->u.mntr_flags;
 312
 313 #define ADJUST(_f, _s)  do {                                    \
 314         if (flags & MONITOR_FLAG_##_f)                          \
 315                 local->fif_##_s += offset;                      \
 316         } while (0)
 317
 318         ADJUST(FCSFAIL, fcsfail);
 319         ADJUST(PLCPFAIL, plcpfail);
 320         ADJUST(CONTROL, control);
 321         ADJUST(CONTROL, pspoll);
 322         ADJUST(OTHER_BSS, other_bss);
 323
 324 #undef ADJUST
 325 }
 326
 327 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 328 {
 329         struct ieee80211_local *local = sdata->local;
 330         int i;
 331
 332         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 333                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
 334                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 335                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 336                         sdata->vif.hw_queue[i] = i;
 337                 else
 338                         sdata->vif.hw_queue[i] = 0;
 339         }
 340         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 341 }
 342
 343 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 344 {
 345         struct ieee80211_sub_if_data *sdata;
 346         int ret = 0;
 347
 348         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 349                 return 0;
 350
 351         mutex_lock(&local->iflist_mtx);
 352
 353         if (local->monitor_sdata)
 354                 goto out_unlock;
 355
 356         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 357         if (!sdata) {
 358                 ret = -ENOMEM;
 359                 goto out_unlock;
 360         }
 361
 362         /* set up data */
 363         sdata->local = local;
 364         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 365         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 366                  wiphy_name(local->hw.wiphy));
 367
 368         ieee80211_set_default_queues(sdata);
 369
 370         ret = drv_add_interface(local, sdata);
 371         if (WARN_ON(ret)) {
 372                 /* ok .. stupid driver, it asked for this! */
 373                 kfree(sdata);
 374                 goto out_unlock;
 375         }
 376
 377         ret = ieee80211_check_queues(sdata);
 378         if (ret) {
 379                 kfree(sdata);
 380                 goto out_unlock;
 381         }
 382
 383         rcu_assign_pointer(local->monitor_sdata, sdata);
 384  out_unlock:
 385         mutex_unlock(&local->iflist_mtx);
 386         return ret;
 387 }
 388
 389 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 390 {
 391         struct ieee80211_sub_if_data *sdata;
 392
 393         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 394                 return;
 395
 396         mutex_lock(&local->iflist_mtx);
 397
 398         sdata = rcu_dereference_protected(local->monitor_sdata,
 399                                           lockdep_is_held(&local->iflist_mtx));
 400         if (!sdata)
 401                 goto out_unlock;
 402
 403         rcu_assign_pointer(local->monitor_sdata, NULL);
 404         synchronize_net();
 405
 406         drv_remove_interface(local, sdata);
 407
 408         kfree(sdata);
 409  out_unlock:
 410         mutex_unlock(&local->iflist_mtx);
 411 }
 412
 413 /*
 414  * NOTE: Be very careful when changing this function, it must NOT return
 415  * an error on interface type changes that have been pre-checked, so most
 416  * checks should be in ieee80211_check_concurrent_iface.
 417  */
 418 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 419 {
 420         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 421         struct net_device *dev = wdev->netdev;
 422         struct ieee80211_local *local = sdata->local;
 423         struct sta_info *sta;
 424         u32 changed = 0;
 425         int res;
 426         u32 hw_reconf_flags = 0;
 427
 428         switch (sdata->vif.type) {
 429         case NL80211_IFTYPE_WDS:
 430                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 431                         return -ENOLINK;
 432                 break;
 433         case NL80211_IFTYPE_AP_VLAN: {
 434                 struct ieee80211_sub_if_data *master;
 435
 436                 if (!sdata->bss)
 437                         return -ENOLINK;
 438
 439                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 440
 441                 master = container_of(sdata->bss,
 442                                       struct ieee80211_sub_if_data, u.ap);
 443                 sdata->control_port_protocol =
 444                         master->control_port_protocol;
 445                 sdata->control_port_no_encrypt =
 446                         master->control_port_no_encrypt;
 447                 break;
 448                 }
 449         case NL80211_IFTYPE_AP:
 450                 sdata->bss = &sdata->u.ap;
 451                 break;
 452         case NL80211_IFTYPE_MESH_POINT:
 453         case NL80211_IFTYPE_STATION:
 454         case NL80211_IFTYPE_MONITOR:
 455         case NL80211_IFTYPE_ADHOC:
 456         case NL80211_IFTYPE_P2P_DEVICE:
 457                 /* no special treatment */
 458                 break;
 459         case NL80211_IFTYPE_UNSPECIFIED:
 460         case NUM_NL80211_IFTYPES:
 461         case NL80211_IFTYPE_P2P_CLIENT:
 462         case NL80211_IFTYPE_P2P_GO:
 463                 /* cannot happen */
 464                 WARN_ON(1);
 465                 break;
 466         }
 467
 468         if (local->open_count == 0) {
 469                 res = drv_start(local);
 470                 if (res)
 471                         goto err_del_bss;
 472                 if (local->ops->napi_poll)
 473                         napi_enable(&local->napi);
 474                 /* we're brought up, everything changes */
 475                 hw_reconf_flags = ~0;
 476                 ieee80211_led_radio(local, true);
 477                 ieee80211_mod_tpt_led_trig(local,
 478                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 479         }
 480
 481         /*
 482          * Copy the hopefully now-present MAC address to
 483          * this interface, if it has the special null one.
 484          */
 485         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 486                 memcpy(dev->dev_addr,
 487                        local->hw.wiphy->perm_addr,
 488                        ETH_ALEN);
 489                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 490
 491                 if (!is_valid_ether_addr(dev->dev_addr)) {
 492                         res = -EADDRNOTAVAIL;
 493                         goto err_stop;
 494                 }
 495         }
 496
 497         switch (sdata->vif.type) {
 498         case NL80211_IFTYPE_AP_VLAN:
 499                 /* no need to tell driver, but set carrier */
 500                 if (rtnl_dereference(sdata->bss->beacon))
 501                         netif_carrier_on(dev);
 502                 else
 503                         netif_carrier_off(dev);
 504                 break;
 505         case NL80211_IFTYPE_MONITOR:
 506                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 507                         local->cooked_mntrs++;
 508                         break;
 509                 }
 510
 511                 if (local->monitors == 0 && local->open_count == 0) {
 512                         res = ieee80211_add_virtual_monitor(local);
 513                         if (res)
 514                                 goto err_stop;
 515                 }
 516
 517                 /* must be before the call to ieee80211_configure_filter */
 518                 local->monitors++;
 519                 if (local->monitors == 1) {
 520                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 521                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 522                 }
 523
 524                 ieee80211_adjust_monitor_flags(sdata, 1);
 525                 ieee80211_configure_filter(local);
 526
 527                 netif_carrier_on(dev);
 528                 break;
 529         default:
 530                 if (coming_up) {
 531                         ieee80211_del_virtual_monitor(local);
 532
 533                         res = drv_add_interface(local, sdata);
 534                         if (res)
 535                                 goto err_stop;
 536                         res = ieee80211_check_queues(sdata);
 537                         if (res)
 538                                 goto err_del_interface;
 539                 }
 540
 541                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 542                         local->fif_pspoll++;
 543                         local->fif_probe_req++;
 544
 545                         ieee80211_configure_filter(local);
 546                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 547                         local->fif_probe_req++;
 548                 }
 549
 550                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 551                         changed |= ieee80211_reset_erp_info(sdata);
 552                 ieee80211_bss_info_change_notify(sdata, changed);
 553
 554                 switch (sdata->vif.type) {
 555                 case NL80211_IFTYPE_STATION:
 556                 case NL80211_IFTYPE_ADHOC:
 557                 case NL80211_IFTYPE_AP:
 558                 case NL80211_IFTYPE_MESH_POINT:
 559                         netif_carrier_off(dev);
 560                         break;
 561                 case NL80211_IFTYPE_WDS:
 562                 case NL80211_IFTYPE_P2P_DEVICE:
 563                         break;
 564                 default:
 565                         netif_carrier_on(dev);
 566                 }
 567
 568                 /*
 569                  * set default queue parameters so drivers don't
 570                  * need to initialise the hardware if the hardware
 571                  * doesn't start up with sane defaults
 572                  */
 573                 ieee80211_set_wmm_default(sdata, true);
 574         }
 575
 576         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 577
 578         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 579                 /* Create STA entry for the WDS peer */
 580                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 581                                      GFP_KERNEL);
 582                 if (!sta) {
 583                         res = -ENOMEM;
 584                         goto err_del_interface;
 585                 }
 586
 587                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 588                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 589                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 590
 591                 res = sta_info_insert(sta);
 592                 if (res) {
 593                         /* STA has been freed */
 594                         goto err_del_interface;
 595                 }
 596
 597                 rate_control_rate_init(sta);
 598                 netif_carrier_on(dev);
 599         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 600                 rcu_assign_pointer(local->p2p_sdata, sdata);
 601         }
 602
 603         /*
 604          * set_multicast_list will be invoked by the networking core
 605          * which will check whether any increments here were done in
 606          * error and sync them down to the hardware as filter flags.
 607          */
 608         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 609                 atomic_inc(&local->iff_allmultis);
 610
 611         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 612                 atomic_inc(&local->iff_promiscs);
 613
 614         mutex_lock(&local->mtx);
 615         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 616         mutex_unlock(&local->mtx);
 617
 618         if (coming_up)
 619                 local->open_count++;
 620
 621         if (hw_reconf_flags)
 622                 ieee80211_hw_config(local, hw_reconf_flags);
 623
 624         ieee80211_recalc_ps(local, -1);
 625
 626         if (dev)
 627                 netif_tx_start_all_queues(dev);
 628
 629         return 0;
 630  err_del_interface:
 631         drv_remove_interface(local, sdata);
 632  err_stop:
 633         if (!local->open_count)
 634                 drv_stop(local);
 635  err_del_bss:
 636         sdata->bss = NULL;
 637         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 638                 list_del(&sdata->u.vlan.list);
 639         /* might already be clear but that doesn't matter */
 640         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 641         return res;
 642 }
 643
 644 static int ieee80211_open(struct net_device *dev)
 645 {
 646         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 647         int err;
 648
 649         /* fail early if user set an invalid address */
 650         if (!is_valid_ether_addr(dev->dev_addr))
 651                 return -EADDRNOTAVAIL;
 652
 653         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 654         if (err)
 655                 return err;
 656
 657         return ieee80211_do_open(&sdata->wdev, true);
 658 }
 659
 660 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 661                               bool going_down)
 662 {
 663         struct ieee80211_local *local = sdata->local;
 664         unsigned long flags;
 665         struct sk_buff *skb, *tmp;
 666         u32 hw_reconf_flags = 0;
 667         int i;
 668         enum nl80211_channel_type orig_ct;
 669
 670         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 671
 672         if (rcu_access_pointer(local->scan_sdata) == sdata)
 673                 ieee80211_scan_cancel(local);
 674
 675         /*
 676          * Stop TX on this interface first.
 677          */
 678         if (sdata->dev)
 679                 netif_tx_stop_all_queues(sdata->dev);
 680
 681         ieee80211_roc_purge(sdata);
 682
 683         /*
 684          * Remove all stations associated with this interface.
 685          *
 686          * This must be done before calling ops->remove_interface()
 687          * because otherwise we can later invoke ops->sta_notify()
 688          * whenever the STAs are removed, and that invalidates driver
 689          * assumptions about always getting a vif pointer that is valid
 690          * (because if we remove a STA after ops->remove_interface()
 691          * the driver will have removed the vif info already!)
 692          *
 693          * This is relevant only in AP, WDS and mesh modes, since in
 694          * all other modes we've already removed all stations when
 695          * disconnecting etc.
 696          */
 697         sta_info_flush(local, sdata);
 698
 699         /*
 700          * Don't count this interface for promisc/allmulti while it
 701          * is down. dev_mc_unsync() will invoke set_multicast_list
 702          * on the master interface which will sync these down to the
 703          * hardware as filter flags.
 704          */
 705         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 706                 atomic_dec(&local->iff_allmultis);
 707
 708         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 709                 atomic_dec(&local->iff_promiscs);
 710
 711         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 712                 local->fif_pspoll--;
 713                 local->fif_probe_req--;
 714         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 715                 local->fif_probe_req--;
 716         }
 717
 718         if (sdata->dev) {
 719                 netif_addr_lock_bh(sdata->dev);
 720                 spin_lock_bh(&local->filter_lock);
 721                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 722                                  sdata->dev->addr_len);
 723                 spin_unlock_bh(&local->filter_lock);
 724                 netif_addr_unlock_bh(sdata->dev);
 725
 726                 ieee80211_configure_filter(local);
 727         }
 728
 729         del_timer_sync(&local->dynamic_ps_timer);
 730         cancel_work_sync(&local->dynamic_ps_enable_work);
 731
 732         /* APs need special treatment */
 733         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 734                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 735                 struct beacon_data *old_beacon =
 736                         rtnl_dereference(sdata->u.ap.beacon);
 737                 struct probe_resp *old_probe_resp =
 738                         rtnl_dereference(sdata->u.ap.probe_resp);
 739
 740                 /* sdata_running will return false, so this will disable */
 741                 ieee80211_bss_info_change_notify(sdata,
 742                                                  BSS_CHANGED_BEACON_ENABLED);
 743
 744                 /* remove beacon and probe response */
 745                 RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
 746                 RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL);
 747                 synchronize_rcu();
 748                 kfree(old_beacon);
 749                 kfree(old_probe_resp);
 750
 751                 /* down all dependent devices, that is VLANs */
 752                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 753                                          u.vlan.list)
 754                         dev_close(vlan->dev);
 755                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 756
 757                 /* free all potentially still buffered bcast frames */
 758                 local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf);
 759                 skb_queue_purge(&sdata->u.ap.ps_bc_buf);
 760         } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 761                 ieee80211_mgd_stop(sdata);
 762         }
 763
 764         if (going_down)
 765                 local->open_count--;
 766
 767         switch (sdata->vif.type) {
 768         case NL80211_IFTYPE_AP_VLAN:
 769                 list_del(&sdata->u.vlan.list);
 770                 /* no need to tell driver */
 771                 break;
 772         case NL80211_IFTYPE_MONITOR:
 773                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 774                         local->cooked_mntrs--;
 775                         break;
 776                 }
 777
 778                 local->monitors--;
 779                 if (local->monitors == 0) {
 780                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 781                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 782                         ieee80211_del_virtual_monitor(local);
 783                 }
 784
 785                 ieee80211_adjust_monitor_flags(sdata, -1);
 786                 ieee80211_configure_filter(local);
 787                 break;
 788         case NL80211_IFTYPE_P2P_DEVICE:
 789                 /* relies on synchronize_rcu() below */
 790                 rcu_assign_pointer(local->p2p_sdata, NULL);
 791                 /* fall through */
 792         default:
 793                 flush_work(&sdata->work);
 794                 /*
 795                  * When we get here, the interface is marked down.
 796                  * Call rcu_barrier() to wait both for the RX path
 797                  * should it be using the interface and enqueuing
 798                  * frames at this very time on another CPU, and
 799                  * for the sta free call_rcu callbacks.
 800                  */
 801                 rcu_barrier();
 802
 803                 /*
 804                  * free_sta_rcu() enqueues a work for the actual
 805                  * sta cleanup, so we need to flush it while
 806                  * sdata is still valid.
 807                  */
 808                 flush_workqueue(local->workqueue);
 809
 810                 skb_queue_purge(&sdata->skb_queue);
 811
 812                 /*
 813                  * Free all remaining keys, there shouldn't be any,
 814                  * except maybe group keys in AP more or WDS?
 815                  */
 816                 ieee80211_free_keys(sdata);
 817
 818                 if (going_down)
 819                         drv_remove_interface(local, sdata);
 820         }
 821
 822         sdata->bss = NULL;
 823
 824         mutex_lock(&local->mtx);
 825         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 826         mutex_unlock(&local->mtx);
 827
 828         ieee80211_recalc_ps(local, -1);
 829
 830         if (local->open_count == 0) {
 831                 if (local->ops->napi_poll)
 832                         napi_disable(&local->napi);
 833                 ieee80211_clear_tx_pending(local);
 834                 ieee80211_stop_device(local);
 835
 836                 /* no reconfiguring after stop! */
 837                 hw_reconf_flags = 0;
 838         }
 839
 840         /* Re-calculate channel-type, in case there are multiple vifs
 841          * on different channel types.
 842          */
 843         orig_ct = local->_oper_channel_type;
 844         ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT);
 845
 846         /* do after stop to avoid reconfiguring when we stop anyway */
 847         if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
 848                 ieee80211_hw_config(local, hw_reconf_flags);
 849
 850         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 851         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 852                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 853                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 854                         if (info->control.vif == &sdata->vif) {
 855                                 __skb_unlink(skb, &local->pending[i]);
 856                                 dev_kfree_skb_irq(skb);
 857                         }
 858                 }
 859         }
 860         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 861
 862         if (local->monitors == local->open_count && local->monitors > 0)
 863                 ieee80211_add_virtual_monitor(local);
 864 }
 865
 866 static int ieee80211_stop(struct net_device *dev)
 867 {
 868         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 869
 870         ieee80211_do_stop(sdata, true);
 871
 872         return 0;
 873 }
 874
 875 static void ieee80211_set_multicast_list(struct net_device *dev)
 876 {
 877         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 878         struct ieee80211_local *local = sdata->local;
 879         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 880
 881         allmulti = !!(dev->flags & IFF_ALLMULTI);
 882         promisc = !!(dev->flags & IFF_PROMISC);
 883         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 884         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 885
 886         if (allmulti != sdata_allmulti) {
 887                 if (dev->flags & IFF_ALLMULTI)
 888                         atomic_inc(&local->iff_allmultis);
 889                 else
 890                         atomic_dec(&local->iff_allmultis);
 891                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 892         }
 893
 894         if (promisc != sdata_promisc) {
 895                 if (dev->flags & IFF_PROMISC)
 896                         atomic_inc(&local->iff_promiscs);
 897                 else
 898                         atomic_dec(&local->iff_promiscs);
 899                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 900         }
 901         spin_lock_bh(&local->filter_lock);
 902         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 903         spin_unlock_bh(&local->filter_lock);
 904         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 905 }
 906
 907 /*
 908  * Called when the netdev is removed or, by the code below, before
 909  * the interface type changes.
 910  */
 911 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 912 {
 913         struct ieee80211_local *local = sdata->local;
 914         int flushed;
 915         int i;
 916
 917         /* free extra data */
 918         ieee80211_free_keys(sdata);
 919
 920         ieee80211_debugfs_remove_netdev(sdata);
 921
 922         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 923                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 924         sdata->fragment_next = 0;
 925
 926         if (ieee80211_vif_is_mesh(&sdata->vif))
 927                 mesh_rmc_free(sdata);
 928
 929         flushed = sta_info_flush(local, sdata);
 930         WARN_ON(flushed);
 931 }
 932
 933 static void ieee80211_uninit(struct net_device *dev)
 934 {
 935         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
 936 }
 937
 938 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 939                                          struct sk_buff *skb)
 940 {
 941         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 942 }
 943
 944 static const struct net_device_ops ieee80211_dataif_ops = {
 945         .ndo_open               = ieee80211_open,
 946         .ndo_stop               = ieee80211_stop,
 947         .ndo_uninit             = ieee80211_uninit,
 948         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 949         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 950         .ndo_change_mtu         = ieee80211_change_mtu,
 951         .ndo_set_mac_address    = ieee80211_change_mac,
 952         .ndo_select_queue       = ieee80211_netdev_select_queue,
 953 };
 954
 955 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 956                                           struct sk_buff *skb)
 957 {
 958         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 959         struct ieee80211_local *local = sdata->local;
 960         struct ieee80211_hdr *hdr;
 961         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 962
 963         if (local->hw.queues < IEEE80211_NUM_ACS)
 964                 return 0;
 965
 966         if (skb->len < 4 ||
 967             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 968                 return 0; /* doesn't matter, frame will be dropped */
 969
 970         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 971
 972         return ieee80211_select_queue_80211(sdata, skb, hdr);
 973 }
 974
 975 static const struct net_device_ops ieee80211_monitorif_ops = {
 976         .ndo_open               = ieee80211_open,
 977         .ndo_stop               = ieee80211_stop,
 978         .ndo_uninit             = ieee80211_uninit,
 979         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 980         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 981         .ndo_change_mtu         = ieee80211_change_mtu,
 982         .ndo_set_mac_address    = eth_mac_addr,
 983         .ndo_select_queue       = ieee80211_monitor_select_queue,
 984 };
 985
 986 static void ieee80211_if_setup(struct net_device *dev)
 987 {
 988         ether_setup(dev);
 989         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
 990         dev->netdev_ops = &ieee80211_dataif_ops;
 991         dev->destructor = free_netdev;
 992 }
 993
 994 static void ieee80211_iface_work(struct work_struct *work)
 995 {
 996         struct ieee80211_sub_if_data *sdata =
 997                 container_of(work, struct ieee80211_sub_if_data, work);
 998         struct ieee80211_local *local = sdata->local;
 999         struct sk_buff *skb;
1000         struct sta_info *sta;
1001         struct ieee80211_ra_tid *ra_tid;
1002
1003         if (!ieee80211_sdata_running(sdata))
1004                 return;
1005
1006         if (local->scanning)
1007                 return;
1008
1009         /*
1010          * ieee80211_queue_work() should have picked up most cases,
1011          * here we'll pick the rest.
1012          */
1013         if (WARN(local->suspended,
1014                  "interface work scheduled while going to suspend\n"))
1015                 return;
1016
1017         /* first process frames */
1018         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1019                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1020
1021                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1022                         ra_tid = (void *)&skb->cb;
1023                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1024                                                  ra_tid->tid);
1025                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1026                         ra_tid = (void *)&skb->cb;
1027                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1028                                                 ra_tid->tid);
1029                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1030                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1031                         int len = skb->len;
1032
1033                         mutex_lock(&local->sta_mtx);
1034                         sta = sta_info_get_bss(sdata, mgmt->sa);
1035                         if (sta) {
1036                                 switch (mgmt->u.action.u.addba_req.action_code) {
1037                                 case WLAN_ACTION_ADDBA_REQ:
1038                                         ieee80211_process_addba_request(
1039                                                         local, sta, mgmt, len);
1040                                         break;
1041                                 case WLAN_ACTION_ADDBA_RESP:
1042                                         ieee80211_process_addba_resp(local, sta,
1043                                                                      mgmt, len);
1044                                         break;
1045                                 case WLAN_ACTION_DELBA:
1046                                         ieee80211_process_delba(sdata, sta,
1047                                                                 mgmt, len);
1048                                         break;
1049                                 default:
1050                                         WARN_ON(1);
1051                                         break;
1052                                 }
1053                         }
1054                         mutex_unlock(&local->sta_mtx);
1055                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1056                         struct ieee80211_hdr *hdr = (void *)mgmt;
1057                         /*
1058                          * So the frame isn't mgmt, but frame_control
1059                          * is at the right place anyway, of course, so
1060                          * the if statement is correct.
1061                          *
1062                          * Warn if we have other data frame types here,
1063                          * they must not get here.
1064                          */
1065                         WARN_ON(hdr->frame_control &
1066                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1067                         WARN_ON(!(hdr->seq_ctrl &
1068                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1069                         /*
1070                          * This was a fragment of a frame, received while
1071                          * a block-ack session was active. That cannot be
1072                          * right, so terminate the session.
1073                          */
1074                         mutex_lock(&local->sta_mtx);
1075                         sta = sta_info_get_bss(sdata, mgmt->sa);
1076                         if (sta) {
1077                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1078                                                 IEEE80211_QOS_CTL_TID_MASK;
1079
1080                                 __ieee80211_stop_rx_ba_session(
1081                                         sta, tid, WLAN_BACK_RECIPIENT,
1082                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1083                                         true);
1084                         }
1085                         mutex_unlock(&local->sta_mtx);
1086                 } else switch (sdata->vif.type) {
1087                 case NL80211_IFTYPE_STATION:
1088                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1089                         break;
1090                 case NL80211_IFTYPE_ADHOC:
1091                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1092                         break;
1093                 case NL80211_IFTYPE_MESH_POINT:
1094                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1095                                 break;
1096                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1097                         break;
1098                 default:
1099                         WARN(1, "frame for unexpected interface type");
1100                         break;
1101                 }
1102
1103                 kfree_skb(skb);
1104         }
1105
1106         /* then other type-dependent work */
1107         switch (sdata->vif.type) {
1108         case NL80211_IFTYPE_STATION:
1109                 ieee80211_sta_work(sdata);
1110                 break;
1111         case NL80211_IFTYPE_ADHOC:
1112                 ieee80211_ibss_work(sdata);
1113                 break;
1114         case NL80211_IFTYPE_MESH_POINT:
1115                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1116                         break;
1117                 ieee80211_mesh_work(sdata);
1118                 break;
1119         default:
1120                 break;
1121         }
1122 }
1123
1124
1125 /*
1126  * Helper function to initialise an interface to a specific type.
1127  */
1128 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1129                                   enum nl80211_iftype type)
1130 {
1131         /* clear type-dependent union */
1132         memset(&sdata->u, 0, sizeof(sdata->u));
1133
1134         /* and set some type-dependent values */
1135         sdata->vif.type = type;
1136         sdata->vif.p2p = false;
1137         sdata->wdev.iftype = type;
1138
1139         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1140         sdata->control_port_no_encrypt = false;
1141
1142         sdata->noack_map = 0;
1143
1144         /* only monitor/p2p-device differ */
1145         if (sdata->dev) {
1146                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1147                 sdata->dev->type = ARPHRD_ETHER;
1148         }
1149
1150         skb_queue_head_init(&sdata->skb_queue);
1151         INIT_WORK(&sdata->work, ieee80211_iface_work);
1152
1153         switch (type) {
1154         case NL80211_IFTYPE_P2P_GO:
1155                 type = NL80211_IFTYPE_AP;
1156                 sdata->vif.type = type;
1157                 sdata->vif.p2p = true;
1158                 /* fall through */
1159         case NL80211_IFTYPE_AP:
1160                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
1161                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1162                 break;
1163         case NL80211_IFTYPE_P2P_CLIENT:
1164                 type = NL80211_IFTYPE_STATION;
1165                 sdata->vif.type = type;
1166                 sdata->vif.p2p = true;
1167                 /* fall through */
1168         case NL80211_IFTYPE_STATION:
1169                 ieee80211_sta_setup_sdata(sdata);
1170                 break;
1171         case NL80211_IFTYPE_ADHOC:
1172                 ieee80211_ibss_setup_sdata(sdata);
1173                 break;
1174         case NL80211_IFTYPE_MESH_POINT:
1175                 if (ieee80211_vif_is_mesh(&sdata->vif))
1176                         ieee80211_mesh_init_sdata(sdata);
1177                 break;
1178         case NL80211_IFTYPE_MONITOR:
1179                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1180                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1181                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1182                                       MONITOR_FLAG_OTHER_BSS;
1183                 break;
1184         case NL80211_IFTYPE_WDS:
1185         case NL80211_IFTYPE_AP_VLAN:
1186         case NL80211_IFTYPE_P2P_DEVICE:
1187                 break;
1188         case NL80211_IFTYPE_UNSPECIFIED:
1189         case NUM_NL80211_IFTYPES:
1190                 BUG();
1191                 break;
1192         }
1193
1194         ieee80211_debugfs_add_netdev(sdata);
1195 }
1196
1197 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1198                                            enum nl80211_iftype type)
1199 {
1200         struct ieee80211_local *local = sdata->local;
1201         int ret, err;
1202         enum nl80211_iftype internal_type = type;
1203         bool p2p = false;
1204
1205         ASSERT_RTNL();
1206
1207         if (!local->ops->change_interface)
1208                 return -EBUSY;
1209
1210         switch (sdata->vif.type) {
1211         case NL80211_IFTYPE_AP:
1212         case NL80211_IFTYPE_STATION:
1213         case NL80211_IFTYPE_ADHOC:
1214                 /*
1215                  * Could maybe also all others here?
1216                  * Just not sure how that interacts
1217                  * with the RX/config path e.g. for
1218                  * mesh.
1219                  */
1220                 break;
1221         default:
1222                 return -EBUSY;
1223         }
1224
1225         switch (type) {
1226         case NL80211_IFTYPE_AP:
1227         case NL80211_IFTYPE_STATION:
1228         case NL80211_IFTYPE_ADHOC:
1229                 /*
1230                  * Could probably support everything
1231                  * but WDS here (WDS do_open can fail
1232                  * under memory pressure, which this
1233                  * code isn't prepared to handle).
1234                  */
1235                 break;
1236         case NL80211_IFTYPE_P2P_CLIENT:
1237                 p2p = true;
1238                 internal_type = NL80211_IFTYPE_STATION;
1239                 break;
1240         case NL80211_IFTYPE_P2P_GO:
1241                 p2p = true;
1242                 internal_type = NL80211_IFTYPE_AP;
1243                 break;
1244         default:
1245                 return -EBUSY;
1246         }
1247
1248         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1249         if (ret)
1250                 return ret;
1251
1252         ieee80211_do_stop(sdata, false);
1253
1254         ieee80211_teardown_sdata(sdata);
1255
1256         ret = drv_change_interface(local, sdata, internal_type, p2p);
1257         if (ret)
1258                 type = sdata->vif.type;
1259
1260         /*
1261          * Ignore return value here, there's not much we can do since
1262          * the driver changed the interface type internally already.
1263          * The warnings will hopefully make driver authors fix it :-)
1264          */
1265         ieee80211_check_queues(sdata);
1266
1267         ieee80211_setup_sdata(sdata, type);
1268
1269         err = ieee80211_do_open(&sdata->wdev, false);
1270         WARN(err, "type change: do_open returned %d", err);
1271
1272         return ret;
1273 }
1274
1275 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1276                              enum nl80211_iftype type)
1277 {
1278         int ret;
1279
1280         ASSERT_RTNL();
1281
1282         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1283                 return 0;
1284
1285         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
1286         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
1287             type == NL80211_IFTYPE_ADHOC)
1288                 return -EOPNOTSUPP;
1289
1290         if (ieee80211_sdata_running(sdata)) {
1291                 ret = ieee80211_runtime_change_iftype(sdata, type);
1292                 if (ret)
1293                         return ret;
1294         } else {
1295                 /* Purge and reset type-dependent state. */
1296                 ieee80211_teardown_sdata(sdata);
1297                 ieee80211_setup_sdata(sdata, type);
1298         }
1299
1300         /* reset some values that shouldn't be kept across type changes */
1301         sdata->vif.bss_conf.basic_rates =
1302                 ieee80211_mandatory_rates(sdata->local,
1303                         sdata->local->oper_channel->band);
1304         sdata->drop_unencrypted = 0;
1305         if (type == NL80211_IFTYPE_STATION)
1306                 sdata->u.mgd.use_4addr = false;
1307
1308         return 0;
1309 }
1310
1311 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1312                                        u8 *perm_addr, enum nl80211_iftype type)
1313 {
1314         struct ieee80211_sub_if_data *sdata;
1315         u64 mask, start, addr, val, inc;
1316         u8 *m;
1317         u8 tmp_addr[ETH_ALEN];
1318         int i;
1319
1320         /* default ... something at least */
1321         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1322
1323         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1324             local->hw.wiphy->n_addresses <= 1)
1325                 return;
1326
1327         mutex_lock(&local->iflist_mtx);
1328
1329         switch (type) {
1330         case NL80211_IFTYPE_MONITOR:
1331                 /* doesn't matter */
1332                 break;
1333         case NL80211_IFTYPE_WDS:
1334         case NL80211_IFTYPE_AP_VLAN:
1335                 /* match up with an AP interface */
1336                 list_for_each_entry(sdata, &local->interfaces, list) {
1337                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1338                                 continue;
1339                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1340                         break;
1341                 }
1342                 /* keep default if no AP interface present */
1343                 break;
1344         case NL80211_IFTYPE_P2P_CLIENT:
1345         case NL80211_IFTYPE_P2P_GO:
1346                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1347                         list_for_each_entry(sdata, &local->interfaces, list) {
1348                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1349                                         continue;
1350                                 if (!ieee80211_sdata_running(sdata))
1351                                         continue;
1352                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1353                                 goto out_unlock;
1354                         }
1355                 }
1356                 /* otherwise fall through */
1357         default:
1358                 /* assign a new address if possible -- try n_addresses first */
1359                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1360                         bool used = false;
1361
1362                         list_for_each_entry(sdata, &local->interfaces, list) {
1363                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1364                                            sdata->vif.addr, ETH_ALEN) == 0) {
1365                                         used = true;
1366                                         break;
1367                                 }
1368                         }
1369
1370                         if (!used) {
1371                                 memcpy(perm_addr,
1372                                        local->hw.wiphy->addresses[i].addr,
1373                                        ETH_ALEN);
1374                                 break;
1375                         }
1376                 }
1377
1378                 /* try mask if available */
1379                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1380                         break;
1381
1382                 m = local->hw.wiphy->addr_mask;
1383                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1384                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1385                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1386
1387                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1388                         /* not a contiguous mask ... not handled now! */
1389                         pr_info("not contiguous\n");
1390                         break;
1391                 }
1392
1393                 m = local->hw.wiphy->perm_addr;
1394                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1395                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1396                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1397
1398                 inc = 1ULL<<__ffs64(mask);
1399                 val = (start & mask);
1400                 addr = (start & ~mask) | (val & mask);
1401                 do {
1402                         bool used = false;
1403
1404                         tmp_addr[5] = addr >> 0*8;
1405                         tmp_addr[4] = addr >> 1*8;
1406                         tmp_addr[3] = addr >> 2*8;
1407                         tmp_addr[2] = addr >> 3*8;
1408                         tmp_addr[1] = addr >> 4*8;
1409                         tmp_addr[0] = addr >> 5*8;
1410
1411                         val += inc;
1412
1413                         list_for_each_entry(sdata, &local->interfaces, list) {
1414                                 if (memcmp(tmp_addr, sdata->vif.addr,
1415                                                         ETH_ALEN) == 0) {
1416                                         used = true;
1417                                         break;
1418                                 }
1419                         }
1420
1421                         if (!used) {
1422                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1423                                 break;
1424                         }
1425                         addr = (start & ~mask) | (val & mask);
1426                 } while (addr != start);
1427
1428                 break;
1429         }
1430
1431  out_unlock:
1432         mutex_unlock(&local->iflist_mtx);
1433 }
1434
1435 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1436                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1437                      struct vif_params *params)
1438 {
1439         struct net_device *ndev = NULL;
1440         struct ieee80211_sub_if_data *sdata = NULL;
1441         int ret, i;
1442         int txqs = 1;
1443
1444         ASSERT_RTNL();
1445
1446         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1447                 struct wireless_dev *wdev;
1448
1449                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1450                                 GFP_KERNEL);
1451                 if (!sdata)
1452                         return -ENOMEM;
1453                 wdev = &sdata->wdev;
1454
1455                 sdata->dev = NULL;
1456                 strlcpy(sdata->name, name, IFNAMSIZ);
1457                 ieee80211_assign_perm_addr(local, wdev->address, type);
1458                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1459         } else {
1460                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1461                         txqs = IEEE80211_NUM_ACS;
1462
1463                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1464                                         local->hw.vif_data_size,
1465                                         name, ieee80211_if_setup, txqs, 1);
1466                 if (!ndev)
1467                         return -ENOMEM;
1468                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1469
1470                 ndev->needed_headroom = local->tx_headroom +
1471                                         4*6 /* four MAC addresses */
1472                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1473                                         + 6 /* mesh */
1474                                         + 8 /* rfc1042/bridge tunnel */
1475                                         - ETH_HLEN /* ethernet hard_header_len */
1476                                         + IEEE80211_ENCRYPT_HEADROOM;
1477                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1478
1479                 ret = dev_alloc_name(ndev, ndev->name);
1480                 if (ret < 0) {
1481                         free_netdev(ndev);
1482                         return ret;
1483                 }
1484
1485                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1486                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1487                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1488
1489                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1490                 sdata = netdev_priv(ndev);
1491                 ndev->ieee80211_ptr = &sdata->wdev;
1492                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1493                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1494
1495                 sdata->dev = ndev;
1496         }
1497
1498         /* initialise type-independent data */
1499         sdata->wdev.wiphy = local->hw.wiphy;
1500         sdata->local = local;
1501 #ifdef CONFIG_INET
1502         sdata->arp_filter_state = true;
1503 #endif
1504
1505         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1506                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1507
1508         INIT_LIST_HEAD(&sdata->key_list);
1509
1510         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1511                 struct ieee80211_supported_band *sband;
1512                 sband = local->hw.wiphy->bands[i];
1513                 sdata->rc_rateidx_mask[i] =
1514                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1515                 if (sband)
1516                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1517                                sband->ht_cap.mcs.rx_mask,
1518                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1519                 else
1520                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1521                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1522         }
1523
1524         ieee80211_set_default_queues(sdata);
1525
1526         /* setup type-dependent data */
1527         ieee80211_setup_sdata(sdata, type);
1528
1529         if (ndev) {
1530                 if (params) {
1531                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1532                         if (type == NL80211_IFTYPE_STATION)
1533                                 sdata->u.mgd.use_4addr = params->use_4addr;
1534                 }
1535
1536                 ndev->features |= local->hw.netdev_features;
1537
1538                 ret = register_netdevice(ndev);
1539                 if (ret) {
1540                         free_netdev(ndev);
1541                         return ret;
1542                 }
1543         }
1544
1545         mutex_lock(&local->iflist_mtx);
1546         list_add_tail_rcu(&sdata->list, &local->interfaces);
1547         mutex_unlock(&local->iflist_mtx);
1548
1549         if (new_wdev)
1550                 *new_wdev = &sdata->wdev;
1551
1552         return 0;
1553 }
1554
1555 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1556 {
1557         ASSERT_RTNL();
1558
1559         mutex_lock(&sdata->local->iflist_mtx);
1560         list_del_rcu(&sdata->list);
1561         mutex_unlock(&sdata->local->iflist_mtx);
1562
1563         synchronize_rcu();
1564
1565         if (sdata->dev) {
1566                 unregister_netdevice(sdata->dev);
1567         } else {
1568                 cfg80211_unregister_wdev(&sdata->wdev);
1569                 kfree(sdata);
1570         }
1571 }
1572
1573 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1574 {
1575         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1576                 return;
1577         ieee80211_do_stop(sdata, true);
1578         ieee80211_teardown_sdata(sdata);
1579 }
1580
1581 /*
1582  * Remove all interfaces, may only be called at hardware unregistration
1583  * time because it doesn't do RCU-safe list removals.
1584  */
1585 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1586 {
1587         struct ieee80211_sub_if_data *sdata, *tmp;
1588         LIST_HEAD(unreg_list);
1589         LIST_HEAD(wdev_list);
1590
1591         ASSERT_RTNL();
1592
1593         mutex_lock(&local->iflist_mtx);
1594         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1595                 list_del(&sdata->list);
1596
1597                 if (sdata->dev)
1598                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1599                 else
1600                         list_add(&sdata->list, &wdev_list);
1601         }
1602         mutex_unlock(&local->iflist_mtx);
1603         unregister_netdevice_many(&unreg_list);
1604         list_del(&unreg_list);
1605
1606         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1607                 list_del(&sdata->list);
1608                 cfg80211_unregister_wdev(&sdata->wdev);
1609                 kfree(sdata);
1610         }
1611 }
1612
1613 static int netdev_notify(struct notifier_block *nb,
1614                          unsigned long state,
1615                          void *ndev)
1616 {
1617         struct net_device *dev = ndev;
1618         struct ieee80211_sub_if_data *sdata;
1619
1620         if (state != NETDEV_CHANGENAME)
1621                 return 0;
1622
1623         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1624                 return 0;
1625
1626         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1627                 return 0;
1628
1629         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1630
1631         memcpy(sdata->name, dev->name, IFNAMSIZ);
1632
1633         ieee80211_debugfs_rename_netdev(sdata);
1634         return 0;
1635 }
1636
1637 static struct notifier_block mac80211_netdev_notifier = {
1638         .notifier_call = netdev_notify,
1639 };
1640
1641 int ieee80211_iface_init(void)
1642 {
1643         return register_netdevice_notifier(&mac80211_netdev_notifier);
1644 }
1645
1646 void ieee80211_iface_exit(void)
1647 {
1648         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1649 }