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