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 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  46 {
  47         struct ieee80211_chanctx_conf *chanctx_conf;
  48         int power;
  49
  50         rcu_read_lock();
  51         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  52         if (!chanctx_conf) {
  53                 rcu_read_unlock();
  54                 return false;
  55         }
  56
  57         power = chanctx_conf->channel->max_power;
  58         rcu_read_unlock();
  59
  60         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  61                 power = min(power, sdata->user_power_level);
  62
  63         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  64                 power = min(power, sdata->ap_power_level);
  65
  66         if (power != sdata->vif.bss_conf.txpower) {
  67                 sdata->vif.bss_conf.txpower = power;
  68                 ieee80211_hw_config(sdata->local, 0);
  69                 return true;
  70         }
  71
  72         return false;
  73 }
  74
  75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  76 {
  77         if (__ieee80211_recalc_txpower(sdata))
  78                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  79 }
  80
  81 static u32 ieee80211_idle_off(struct ieee80211_local *local,
  82                               const char *reason)
  83 {
  84         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  85                 return 0;
  86
  87         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  88         return IEEE80211_CONF_CHANGE_IDLE;
  89 }
  90
  91 static u32 ieee80211_idle_on(struct ieee80211_local *local)
  92 {
  93         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  94                 return 0;
  95
  96         drv_flush(local, false);
  97
  98         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
  99         return IEEE80211_CONF_CHANGE_IDLE;
 100 }
 101
 102 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
 103 {
 104         struct ieee80211_sub_if_data *sdata;
 105         int count = 0;
 106         bool working = false, scanning = false;
 107         unsigned int led_trig_start = 0, led_trig_stop = 0;
 108         struct ieee80211_roc_work *roc;
 109
 110 #ifdef CONFIG_PROVE_LOCKING
 111         WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
 112                 !lockdep_is_held(&local->iflist_mtx));
 113 #endif
 114         lockdep_assert_held(&local->mtx);
 115
 116         list_for_each_entry(sdata, &local->interfaces, list) {
 117                 if (!ieee80211_sdata_running(sdata)) {
 118                         sdata->vif.bss_conf.idle = true;
 119                         continue;
 120                 }
 121
 122                 sdata->old_idle = sdata->vif.bss_conf.idle;
 123
 124                 /* do not count disabled managed interfaces */
 125                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 126                     !sdata->u.mgd.associated &&
 127                     !sdata->u.mgd.auth_data &&
 128                     !sdata->u.mgd.assoc_data) {
 129                         sdata->vif.bss_conf.idle = true;
 130                         continue;
 131                 }
 132                 /* do not count unused IBSS interfaces */
 133                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 134                     !sdata->u.ibss.ssid_len) {
 135                         sdata->vif.bss_conf.idle = true;
 136                         continue;
 137                 }
 138
 139                 if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
 140                         continue;
 141
 142                 /* count everything else */
 143                 sdata->vif.bss_conf.idle = false;
 144                 count++;
 145         }
 146
 147         if (!local->ops->remain_on_channel) {
 148                 list_for_each_entry(roc, &local->roc_list, list) {
 149                         working = true;
 150                         roc->sdata->vif.bss_conf.idle = false;
 151                 }
 152         }
 153
 154         sdata = rcu_dereference_protected(local->scan_sdata,
 155                                           lockdep_is_held(&local->mtx));
 156         if (sdata && !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
 157                 scanning = true;
 158                 sdata->vif.bss_conf.idle = false;
 159         }
 160
 161         list_for_each_entry(sdata, &local->interfaces, list) {
 162                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 163                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
 164                     sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
 165                         continue;
 166                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
 167                         continue;
 168                 if (!ieee80211_sdata_running(sdata))
 169                         continue;
 170                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
 171         }
 172
 173         if (working || scanning)
 174                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 175         else
 176                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 177
 178         if (count)
 179                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 180         else
 181                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 182
 183         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 184
 185         if (working)
 186                 return ieee80211_idle_off(local, "working");
 187         if (scanning)
 188                 return ieee80211_idle_off(local, "scanning");
 189         if (!count)
 190                 return ieee80211_idle_on(local);
 191         else
 192                 return ieee80211_idle_off(local, "in use");
 193
 194         return 0;
 195 }
 196
 197 void ieee80211_recalc_idle(struct ieee80211_local *local)
 198 {
 199         u32 chg;
 200
 201         mutex_lock(&local->iflist_mtx);
 202         chg = __ieee80211_recalc_idle(local);
 203         mutex_unlock(&local->iflist_mtx);
 204         if (chg)
 205                 ieee80211_hw_config(local, chg);
 206 }
 207
 208 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 209 {
 210         int meshhdrlen;
 211         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 212
 213         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
 214
 215         /* FIX: what would be proper limits for MTU?
 216          * This interface uses 802.3 frames. */
 217         if (new_mtu < 256 ||
 218             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
 219                 return -EINVAL;
 220         }
 221
 222         dev->mtu = new_mtu;
 223         return 0;
 224 }
 225
 226 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 227 {
 228         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 229         struct sockaddr *sa = addr;
 230         int ret;
 231
 232         if (ieee80211_sdata_running(sdata))
 233                 return -EBUSY;
 234
 235         ret = eth_mac_addr(dev, sa);
 236
 237         if (ret == 0)
 238                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 239
 240         return ret;
 241 }
 242
 243 static inline int identical_mac_addr_allowed(int type1, int type2)
 244 {
 245         return type1 == NL80211_IFTYPE_MONITOR ||
 246                 type2 == NL80211_IFTYPE_MONITOR ||
 247                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 248                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 249                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 250                 (type1 == NL80211_IFTYPE_WDS &&
 251                         (type2 == NL80211_IFTYPE_WDS ||
 252                          type2 == NL80211_IFTYPE_AP)) ||
 253                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 254                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 255                         (type2 == NL80211_IFTYPE_AP ||
 256                          type2 == NL80211_IFTYPE_AP_VLAN));
 257 }
 258
 259 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 260                                             enum nl80211_iftype iftype)
 261 {
 262         struct ieee80211_local *local = sdata->local;
 263         struct ieee80211_sub_if_data *nsdata;
 264
 265         ASSERT_RTNL();
 266
 267         /* we hold the RTNL here so can safely walk the list */
 268         list_for_each_entry(nsdata, &local->interfaces, list) {
 269                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 270                         /*
 271                          * Allow only a single IBSS interface to be up at any
 272                          * time. This is restricted because beacon distribution
 273                          * cannot work properly if both are in the same IBSS.
 274                          *
 275                          * To remove this restriction we'd have to disallow them
 276                          * from setting the same SSID on different IBSS interfaces
 277                          * belonging to the same hardware. Then, however, we're
 278                          * faced with having to adopt two different TSF timers...
 279                          */
 280                         if (iftype == NL80211_IFTYPE_ADHOC &&
 281                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 282                                 return -EBUSY;
 283
 284                         /*
 285                          * The remaining checks are only performed for interfaces
 286                          * with the same MAC address.
 287                          */
 288                         if (!ether_addr_equal(sdata->vif.addr,
 289                                               nsdata->vif.addr))
 290                                 continue;
 291
 292                         /*
 293                          * check whether it may have the same address
 294                          */
 295                         if (!identical_mac_addr_allowed(iftype,
 296                                                         nsdata->vif.type))
 297                                 return -ENOTUNIQ;
 298
 299                         /*
 300                          * can only add VLANs to enabled APs
 301                          */
 302                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 303                             nsdata->vif.type == NL80211_IFTYPE_AP)
 304                                 sdata->bss = &nsdata->u.ap;
 305                 }
 306         }
 307
 308         return 0;
 309 }
 310
 311 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
 312 {
 313         int n_queues = sdata->local->hw.queues;
 314         int i;
 315
 316         if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
 317                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 318                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 319                                          IEEE80211_INVAL_HW_QUEUE))
 320                                 return -EINVAL;
 321                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 322                                          n_queues))
 323                                 return -EINVAL;
 324                 }
 325         }
 326
 327         if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
 328             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
 329                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 330                 return 0;
 331         }
 332
 333         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 334                 return -EINVAL;
 335
 336         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 337                 return -EINVAL;
 338
 339         return 0;
 340 }
 341
 342 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 343                                     const int offset)
 344 {
 345         struct ieee80211_local *local = sdata->local;
 346         u32 flags = sdata->u.mntr_flags;
 347
 348 #define ADJUST(_f, _s)  do {                                    \
 349         if (flags & MONITOR_FLAG_##_f)                          \
 350                 local->fif_##_s += offset;                      \
 351         } while (0)
 352
 353         ADJUST(FCSFAIL, fcsfail);
 354         ADJUST(PLCPFAIL, plcpfail);
 355         ADJUST(CONTROL, control);
 356         ADJUST(CONTROL, pspoll);
 357         ADJUST(OTHER_BSS, other_bss);
 358
 359 #undef ADJUST
 360 }
 361
 362 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 363 {
 364         struct ieee80211_local *local = sdata->local;
 365         int i;
 366
 367         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 368                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
 369                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 370                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 371                         sdata->vif.hw_queue[i] = i;
 372                 else
 373                         sdata->vif.hw_queue[i] = 0;
 374         }
 375         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 376 }
 377
 378 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 379 {
 380         struct ieee80211_sub_if_data *sdata;
 381         int ret = 0;
 382
 383         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 384                 return 0;
 385
 386         mutex_lock(&local->iflist_mtx);
 387
 388         if (local->monitor_sdata)
 389                 goto out_unlock;
 390
 391         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 392         if (!sdata) {
 393                 ret = -ENOMEM;
 394                 goto out_unlock;
 395         }
 396
 397         /* set up data */
 398         sdata->local = local;
 399         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 400         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 401                  wiphy_name(local->hw.wiphy));
 402
 403         ieee80211_set_default_queues(sdata);
 404
 405         ret = drv_add_interface(local, sdata);
 406         if (WARN_ON(ret)) {
 407                 /* ok .. stupid driver, it asked for this! */
 408                 kfree(sdata);
 409                 goto out_unlock;
 410         }
 411
 412         ret = ieee80211_check_queues(sdata);
 413         if (ret) {
 414                 kfree(sdata);
 415                 goto out_unlock;
 416         }
 417
 418         ret = ieee80211_vif_use_channel(sdata, local->monitor_channel,
 419                                         local->monitor_channel_type,
 420                                         IEEE80211_CHANCTX_EXCLUSIVE);
 421         if (ret) {
 422                 drv_remove_interface(local, sdata);
 423                 kfree(sdata);
 424                 goto out_unlock;
 425         }
 426
 427         rcu_assign_pointer(local->monitor_sdata, sdata);
 428  out_unlock:
 429         mutex_unlock(&local->iflist_mtx);
 430         return ret;
 431 }
 432
 433 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 434 {
 435         struct ieee80211_sub_if_data *sdata;
 436
 437         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 438                 return;
 439
 440         mutex_lock(&local->iflist_mtx);
 441
 442         sdata = rcu_dereference_protected(local->monitor_sdata,
 443                                           lockdep_is_held(&local->iflist_mtx));
 444         if (!sdata)
 445                 goto out_unlock;
 446
 447         rcu_assign_pointer(local->monitor_sdata, NULL);
 448         synchronize_net();
 449
 450         ieee80211_vif_release_channel(sdata);
 451
 452         drv_remove_interface(local, sdata);
 453
 454         kfree(sdata);
 455  out_unlock:
 456         mutex_unlock(&local->iflist_mtx);
 457 }
 458
 459 /*
 460  * NOTE: Be very careful when changing this function, it must NOT return
 461  * an error on interface type changes that have been pre-checked, so most
 462  * checks should be in ieee80211_check_concurrent_iface.
 463  */
 464 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 465 {
 466         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 467         struct net_device *dev = wdev->netdev;
 468         struct ieee80211_local *local = sdata->local;
 469         struct sta_info *sta;
 470         u32 changed = 0;
 471         int res;
 472         u32 hw_reconf_flags = 0;
 473
 474         switch (sdata->vif.type) {
 475         case NL80211_IFTYPE_WDS:
 476                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 477                         return -ENOLINK;
 478                 break;
 479         case NL80211_IFTYPE_AP_VLAN: {
 480                 struct ieee80211_sub_if_data *master;
 481
 482                 if (!sdata->bss)
 483                         return -ENOLINK;
 484
 485                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 486
 487                 master = container_of(sdata->bss,
 488                                       struct ieee80211_sub_if_data, u.ap);
 489                 sdata->control_port_protocol =
 490                         master->control_port_protocol;
 491                 sdata->control_port_no_encrypt =
 492                         master->control_port_no_encrypt;
 493                 break;
 494                 }
 495         case NL80211_IFTYPE_AP:
 496                 sdata->bss = &sdata->u.ap;
 497                 break;
 498         case NL80211_IFTYPE_MESH_POINT:
 499         case NL80211_IFTYPE_STATION:
 500         case NL80211_IFTYPE_MONITOR:
 501         case NL80211_IFTYPE_ADHOC:
 502         case NL80211_IFTYPE_P2P_DEVICE:
 503                 /* no special treatment */
 504                 break;
 505         case NL80211_IFTYPE_UNSPECIFIED:
 506         case NUM_NL80211_IFTYPES:
 507         case NL80211_IFTYPE_P2P_CLIENT:
 508         case NL80211_IFTYPE_P2P_GO:
 509                 /* cannot happen */
 510                 WARN_ON(1);
 511                 break;
 512         }
 513
 514         if (local->open_count == 0) {
 515                 res = drv_start(local);
 516                 if (res)
 517                         goto err_del_bss;
 518                 if (local->ops->napi_poll)
 519                         napi_enable(&local->napi);
 520                 /* we're brought up, everything changes */
 521                 hw_reconf_flags = ~0;
 522                 ieee80211_led_radio(local, true);
 523                 ieee80211_mod_tpt_led_trig(local,
 524                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 525         }
 526
 527         /*
 528          * Copy the hopefully now-present MAC address to
 529          * this interface, if it has the special null one.
 530          */
 531         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 532                 memcpy(dev->dev_addr,
 533                        local->hw.wiphy->perm_addr,
 534                        ETH_ALEN);
 535                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 536
 537                 if (!is_valid_ether_addr(dev->dev_addr)) {
 538                         res = -EADDRNOTAVAIL;
 539                         goto err_stop;
 540                 }
 541         }
 542
 543         switch (sdata->vif.type) {
 544         case NL80211_IFTYPE_AP_VLAN:
 545                 /* no need to tell driver, but set carrier */
 546                 if (rtnl_dereference(sdata->bss->beacon))
 547                         netif_carrier_on(dev);
 548                 else
 549                         netif_carrier_off(dev);
 550                 break;
 551         case NL80211_IFTYPE_MONITOR:
 552                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 553                         local->cooked_mntrs++;
 554                         break;
 555                 }
 556
 557                 if (local->monitors == 0 && local->open_count == 0) {
 558                         res = ieee80211_add_virtual_monitor(local);
 559                         if (res)
 560                                 goto err_stop;
 561                 }
 562
 563                 /* must be before the call to ieee80211_configure_filter */
 564                 local->monitors++;
 565                 if (local->monitors == 1) {
 566                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 567                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 568                 }
 569
 570                 ieee80211_adjust_monitor_flags(sdata, 1);
 571                 ieee80211_configure_filter(local);
 572
 573                 netif_carrier_on(dev);
 574                 break;
 575         default:
 576                 if (coming_up) {
 577                         ieee80211_del_virtual_monitor(local);
 578
 579                         res = drv_add_interface(local, sdata);
 580                         if (res)
 581                                 goto err_stop;
 582                         res = ieee80211_check_queues(sdata);
 583                         if (res)
 584                                 goto err_del_interface;
 585                 }
 586
 587                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 588                         local->fif_pspoll++;
 589                         local->fif_probe_req++;
 590
 591                         ieee80211_configure_filter(local);
 592                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 593                         local->fif_probe_req++;
 594                 }
 595
 596                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 597                         changed |= ieee80211_reset_erp_info(sdata);
 598                 ieee80211_bss_info_change_notify(sdata, changed);
 599
 600                 switch (sdata->vif.type) {
 601                 case NL80211_IFTYPE_STATION:
 602                 case NL80211_IFTYPE_ADHOC:
 603                 case NL80211_IFTYPE_AP:
 604                 case NL80211_IFTYPE_MESH_POINT:
 605                         netif_carrier_off(dev);
 606                         break;
 607                 case NL80211_IFTYPE_WDS:
 608                 case NL80211_IFTYPE_P2P_DEVICE:
 609                         break;
 610                 default:
 611                         netif_carrier_on(dev);
 612                 }
 613
 614                 /*
 615                  * set default queue parameters so drivers don't
 616                  * need to initialise the hardware if the hardware
 617                  * doesn't start up with sane defaults
 618                  */
 619                 ieee80211_set_wmm_default(sdata, true);
 620         }
 621
 622         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 623
 624         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 625                 /* Create STA entry for the WDS peer */
 626                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 627                                      GFP_KERNEL);
 628                 if (!sta) {
 629                         res = -ENOMEM;
 630                         goto err_del_interface;
 631                 }
 632
 633                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 634                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 635                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 636
 637                 res = sta_info_insert(sta);
 638                 if (res) {
 639                         /* STA has been freed */
 640                         goto err_del_interface;
 641                 }
 642
 643                 rate_control_rate_init(sta);
 644                 netif_carrier_on(dev);
 645         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 646                 rcu_assign_pointer(local->p2p_sdata, sdata);
 647         }
 648
 649         /*
 650          * set_multicast_list will be invoked by the networking core
 651          * which will check whether any increments here were done in
 652          * error and sync them down to the hardware as filter flags.
 653          */
 654         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 655                 atomic_inc(&local->iff_allmultis);
 656
 657         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 658                 atomic_inc(&local->iff_promiscs);
 659
 660         mutex_lock(&local->mtx);
 661         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 662         mutex_unlock(&local->mtx);
 663
 664         if (coming_up)
 665                 local->open_count++;
 666
 667         if (hw_reconf_flags)
 668                 ieee80211_hw_config(local, hw_reconf_flags);
 669
 670         ieee80211_recalc_ps(local, -1);
 671
 672         if (dev)
 673                 netif_tx_start_all_queues(dev);
 674
 675         return 0;
 676  err_del_interface:
 677         drv_remove_interface(local, sdata);
 678  err_stop:
 679         if (!local->open_count)
 680                 drv_stop(local);
 681  err_del_bss:
 682         sdata->bss = NULL;
 683         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 684                 list_del(&sdata->u.vlan.list);
 685         /* might already be clear but that doesn't matter */
 686         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 687         return res;
 688 }
 689
 690 static int ieee80211_open(struct net_device *dev)
 691 {
 692         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 693         int err;
 694
 695         /* fail early if user set an invalid address */
 696         if (!is_valid_ether_addr(dev->dev_addr))
 697                 return -EADDRNOTAVAIL;
 698
 699         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 700         if (err)
 701                 return err;
 702
 703         return ieee80211_do_open(&sdata->wdev, true);
 704 }
 705
 706 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 707                               bool going_down)
 708 {
 709         struct ieee80211_local *local = sdata->local;
 710         unsigned long flags;
 711         struct sk_buff *skb, *tmp;
 712         u32 hw_reconf_flags = 0;
 713         int i;
 714
 715         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 716
 717         if (rcu_access_pointer(local->scan_sdata) == sdata)
 718                 ieee80211_scan_cancel(local);
 719
 720         /*
 721          * Stop TX on this interface first.
 722          */
 723         if (sdata->dev)
 724                 netif_tx_stop_all_queues(sdata->dev);
 725
 726         ieee80211_roc_purge(sdata);
 727
 728         /*
 729          * Remove all stations associated with this interface.
 730          *
 731          * This must be done before calling ops->remove_interface()
 732          * because otherwise we can later invoke ops->sta_notify()
 733          * whenever the STAs are removed, and that invalidates driver
 734          * assumptions about always getting a vif pointer that is valid
 735          * (because if we remove a STA after ops->remove_interface()
 736          * the driver will have removed the vif info already!)
 737          *
 738          * This is relevant only in AP, WDS and mesh modes, since in
 739          * all other modes we've already removed all stations when
 740          * disconnecting etc.
 741          */
 742         sta_info_flush(local, sdata);
 743
 744         /*
 745          * Don't count this interface for promisc/allmulti while it
 746          * is down. dev_mc_unsync() will invoke set_multicast_list
 747          * on the master interface which will sync these down to the
 748          * hardware as filter flags.
 749          */
 750         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 751                 atomic_dec(&local->iff_allmultis);
 752
 753         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 754                 atomic_dec(&local->iff_promiscs);
 755
 756         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 757                 local->fif_pspoll--;
 758                 local->fif_probe_req--;
 759         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 760                 local->fif_probe_req--;
 761         }
 762
 763         if (sdata->dev) {
 764                 netif_addr_lock_bh(sdata->dev);
 765                 spin_lock_bh(&local->filter_lock);
 766                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 767                                  sdata->dev->addr_len);
 768                 spin_unlock_bh(&local->filter_lock);
 769                 netif_addr_unlock_bh(sdata->dev);
 770
 771                 ieee80211_configure_filter(local);
 772         }
 773
 774         del_timer_sync(&local->dynamic_ps_timer);
 775         cancel_work_sync(&local->dynamic_ps_enable_work);
 776
 777         cancel_work_sync(&sdata->recalc_smps);
 778
 779         /* APs need special treatment */
 780         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 781                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 782
 783                 /* down all dependent devices, that is VLANs */
 784                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 785                                          u.vlan.list)
 786                         dev_close(vlan->dev);
 787                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 788         } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 789                 ieee80211_mgd_stop(sdata);
 790         }
 791
 792         if (going_down)
 793                 local->open_count--;
 794
 795         switch (sdata->vif.type) {
 796         case NL80211_IFTYPE_AP_VLAN:
 797                 list_del(&sdata->u.vlan.list);
 798                 /* no need to tell driver */
 799                 break;
 800         case NL80211_IFTYPE_MONITOR:
 801                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 802                         local->cooked_mntrs--;
 803                         break;
 804                 }
 805
 806                 local->monitors--;
 807                 if (local->monitors == 0) {
 808                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 809                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 810                         ieee80211_del_virtual_monitor(local);
 811                 }
 812
 813                 ieee80211_adjust_monitor_flags(sdata, -1);
 814                 ieee80211_configure_filter(local);
 815                 break;
 816         case NL80211_IFTYPE_P2P_DEVICE:
 817                 /* relies on synchronize_rcu() below */
 818                 rcu_assign_pointer(local->p2p_sdata, NULL);
 819                 /* fall through */
 820         default:
 821                 flush_work(&sdata->work);
 822                 /*
 823                  * When we get here, the interface is marked down.
 824                  * Call rcu_barrier() to wait both for the RX path
 825                  * should it be using the interface and enqueuing
 826                  * frames at this very time on another CPU, and
 827                  * for the sta free call_rcu callbacks.
 828                  */
 829                 rcu_barrier();
 830
 831                 /*
 832                  * free_sta_rcu() enqueues a work for the actual
 833                  * sta cleanup, so we need to flush it while
 834                  * sdata is still valid.
 835                  */
 836                 flush_workqueue(local->workqueue);
 837
 838                 skb_queue_purge(&sdata->skb_queue);
 839
 840                 /*
 841                  * Free all remaining keys, there shouldn't be any,
 842                  * except maybe group keys in AP more or WDS?
 843                  */
 844                 ieee80211_free_keys(sdata);
 845
 846                 if (going_down)
 847                         drv_remove_interface(local, sdata);
 848         }
 849
 850         sdata->bss = NULL;
 851
 852         mutex_lock(&local->mtx);
 853         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 854         mutex_unlock(&local->mtx);
 855
 856         ieee80211_recalc_ps(local, -1);
 857
 858         if (local->open_count == 0) {
 859                 if (local->ops->napi_poll)
 860                         napi_disable(&local->napi);
 861                 ieee80211_clear_tx_pending(local);
 862                 ieee80211_stop_device(local);
 863
 864                 /* no reconfiguring after stop! */
 865                 hw_reconf_flags = 0;
 866         }
 867
 868         /* do after stop to avoid reconfiguring when we stop anyway */
 869         if (hw_reconf_flags)
 870                 ieee80211_hw_config(local, hw_reconf_flags);
 871
 872         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 873         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 874                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 875                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 876                         if (info->control.vif == &sdata->vif) {
 877                                 __skb_unlink(skb, &local->pending[i]);
 878                                 ieee80211_free_txskb(&local->hw, skb);
 879                         }
 880                 }
 881         }
 882         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 883
 884         if (local->monitors == local->open_count && local->monitors > 0)
 885                 ieee80211_add_virtual_monitor(local);
 886 }
 887
 888 static int ieee80211_stop(struct net_device *dev)
 889 {
 890         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 891
 892         ieee80211_do_stop(sdata, true);
 893
 894         return 0;
 895 }
 896
 897 static void ieee80211_set_multicast_list(struct net_device *dev)
 898 {
 899         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 900         struct ieee80211_local *local = sdata->local;
 901         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 902
 903         allmulti = !!(dev->flags & IFF_ALLMULTI);
 904         promisc = !!(dev->flags & IFF_PROMISC);
 905         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 906         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 907
 908         if (allmulti != sdata_allmulti) {
 909                 if (dev->flags & IFF_ALLMULTI)
 910                         atomic_inc(&local->iff_allmultis);
 911                 else
 912                         atomic_dec(&local->iff_allmultis);
 913                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 914         }
 915
 916         if (promisc != sdata_promisc) {
 917                 if (dev->flags & IFF_PROMISC)
 918                         atomic_inc(&local->iff_promiscs);
 919                 else
 920                         atomic_dec(&local->iff_promiscs);
 921                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 922         }
 923         spin_lock_bh(&local->filter_lock);
 924         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 925         spin_unlock_bh(&local->filter_lock);
 926         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 927 }
 928
 929 /*
 930  * Called when the netdev is removed or, by the code below, before
 931  * the interface type changes.
 932  */
 933 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 934 {
 935         struct ieee80211_local *local = sdata->local;
 936         int flushed;
 937         int i;
 938
 939         /* free extra data */
 940         ieee80211_free_keys(sdata);
 941
 942         ieee80211_debugfs_remove_netdev(sdata);
 943
 944         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 945                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 946         sdata->fragment_next = 0;
 947
 948         if (ieee80211_vif_is_mesh(&sdata->vif))
 949                 mesh_rmc_free(sdata);
 950
 951         flushed = sta_info_flush(local, sdata);
 952         WARN_ON(flushed);
 953 }
 954
 955 static void ieee80211_uninit(struct net_device *dev)
 956 {
 957         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
 958 }
 959
 960 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 961                                          struct sk_buff *skb)
 962 {
 963         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 964 }
 965
 966 static const struct net_device_ops ieee80211_dataif_ops = {
 967         .ndo_open               = ieee80211_open,
 968         .ndo_stop               = ieee80211_stop,
 969         .ndo_uninit             = ieee80211_uninit,
 970         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 971         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 972         .ndo_change_mtu         = ieee80211_change_mtu,
 973         .ndo_set_mac_address    = ieee80211_change_mac,
 974         .ndo_select_queue       = ieee80211_netdev_select_queue,
 975 };
 976
 977 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 978                                           struct sk_buff *skb)
 979 {
 980         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 981         struct ieee80211_local *local = sdata->local;
 982         struct ieee80211_hdr *hdr;
 983         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 984
 985         if (local->hw.queues < IEEE80211_NUM_ACS)
 986                 return 0;
 987
 988         if (skb->len < 4 ||
 989             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 990                 return 0; /* doesn't matter, frame will be dropped */
 991
 992         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 993
 994         return ieee80211_select_queue_80211(sdata, skb, hdr);
 995 }
 996
 997 static const struct net_device_ops ieee80211_monitorif_ops = {
 998         .ndo_open               = ieee80211_open,
 999         .ndo_stop               = ieee80211_stop,
1000         .ndo_uninit             = ieee80211_uninit,
1001         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1002         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1003         .ndo_change_mtu         = ieee80211_change_mtu,
1004         .ndo_set_mac_address    = eth_mac_addr,
1005         .ndo_select_queue       = ieee80211_monitor_select_queue,
1006 };
1007
1008 static void ieee80211_if_setup(struct net_device *dev)
1009 {
1010         ether_setup(dev);
1011         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1012         dev->netdev_ops = &ieee80211_dataif_ops;
1013         dev->destructor = free_netdev;
1014 }
1015
1016 static void ieee80211_iface_work(struct work_struct *work)
1017 {
1018         struct ieee80211_sub_if_data *sdata =
1019                 container_of(work, struct ieee80211_sub_if_data, work);
1020         struct ieee80211_local *local = sdata->local;
1021         struct sk_buff *skb;
1022         struct sta_info *sta;
1023         struct ieee80211_ra_tid *ra_tid;
1024
1025         if (!ieee80211_sdata_running(sdata))
1026                 return;
1027
1028         if (local->scanning)
1029                 return;
1030
1031         /*
1032          * ieee80211_queue_work() should have picked up most cases,
1033          * here we'll pick the rest.
1034          */
1035         if (WARN(local->suspended,
1036                  "interface work scheduled while going to suspend\n"))
1037                 return;
1038
1039         /* first process frames */
1040         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1041                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1042
1043                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1044                         ra_tid = (void *)&skb->cb;
1045                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1046                                                  ra_tid->tid);
1047                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1048                         ra_tid = (void *)&skb->cb;
1049                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1050                                                 ra_tid->tid);
1051                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1052                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1053                         int len = skb->len;
1054
1055                         mutex_lock(&local->sta_mtx);
1056                         sta = sta_info_get_bss(sdata, mgmt->sa);
1057                         if (sta) {
1058                                 switch (mgmt->u.action.u.addba_req.action_code) {
1059                                 case WLAN_ACTION_ADDBA_REQ:
1060                                         ieee80211_process_addba_request(
1061                                                         local, sta, mgmt, len);
1062                                         break;
1063                                 case WLAN_ACTION_ADDBA_RESP:
1064                                         ieee80211_process_addba_resp(local, sta,
1065                                                                      mgmt, len);
1066                                         break;
1067                                 case WLAN_ACTION_DELBA:
1068                                         ieee80211_process_delba(sdata, sta,
1069                                                                 mgmt, len);
1070                                         break;
1071                                 default:
1072                                         WARN_ON(1);
1073                                         break;
1074                                 }
1075                         }
1076                         mutex_unlock(&local->sta_mtx);
1077                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1078                         struct ieee80211_hdr *hdr = (void *)mgmt;
1079                         /*
1080                          * So the frame isn't mgmt, but frame_control
1081                          * is at the right place anyway, of course, so
1082                          * the if statement is correct.
1083                          *
1084                          * Warn if we have other data frame types here,
1085                          * they must not get here.
1086                          */
1087                         WARN_ON(hdr->frame_control &
1088                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1089                         WARN_ON(!(hdr->seq_ctrl &
1090                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1091                         /*
1092                          * This was a fragment of a frame, received while
1093                          * a block-ack session was active. That cannot be
1094                          * right, so terminate the session.
1095                          */
1096                         mutex_lock(&local->sta_mtx);
1097                         sta = sta_info_get_bss(sdata, mgmt->sa);
1098                         if (sta) {
1099                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1100                                                 IEEE80211_QOS_CTL_TID_MASK;
1101
1102                                 __ieee80211_stop_rx_ba_session(
1103                                         sta, tid, WLAN_BACK_RECIPIENT,
1104                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1105                                         true);
1106                         }
1107                         mutex_unlock(&local->sta_mtx);
1108                 } else switch (sdata->vif.type) {
1109                 case NL80211_IFTYPE_STATION:
1110                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1111                         break;
1112                 case NL80211_IFTYPE_ADHOC:
1113                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1114                         break;
1115                 case NL80211_IFTYPE_MESH_POINT:
1116                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1117                                 break;
1118                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1119                         break;
1120                 default:
1121                         WARN(1, "frame for unexpected interface type");
1122                         break;
1123                 }
1124
1125                 kfree_skb(skb);
1126         }
1127
1128         /* then other type-dependent work */
1129         switch (sdata->vif.type) {
1130         case NL80211_IFTYPE_STATION:
1131                 ieee80211_sta_work(sdata);
1132                 break;
1133         case NL80211_IFTYPE_ADHOC:
1134                 ieee80211_ibss_work(sdata);
1135                 break;
1136         case NL80211_IFTYPE_MESH_POINT:
1137                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1138                         break;
1139                 ieee80211_mesh_work(sdata);
1140                 break;
1141         default:
1142                 break;
1143         }
1144 }
1145
1146 static void ieee80211_recalc_smps_work(struct work_struct *work)
1147 {
1148         struct ieee80211_sub_if_data *sdata =
1149                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1150
1151         ieee80211_recalc_smps(sdata);
1152 }
1153
1154 /*
1155  * Helper function to initialise an interface to a specific type.
1156  */
1157 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1158                                   enum nl80211_iftype type)
1159 {
1160         /* clear type-dependent union */
1161         memset(&sdata->u, 0, sizeof(sdata->u));
1162
1163         /* and set some type-dependent values */
1164         sdata->vif.type = type;
1165         sdata->vif.p2p = false;
1166         sdata->wdev.iftype = type;
1167
1168         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1169         sdata->control_port_no_encrypt = false;
1170
1171         sdata->noack_map = 0;
1172
1173         /* only monitor/p2p-device differ */
1174         if (sdata->dev) {
1175                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1176                 sdata->dev->type = ARPHRD_ETHER;
1177         }
1178
1179         skb_queue_head_init(&sdata->skb_queue);
1180         INIT_WORK(&sdata->work, ieee80211_iface_work);
1181         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1182
1183         switch (type) {
1184         case NL80211_IFTYPE_P2P_GO:
1185                 type = NL80211_IFTYPE_AP;
1186                 sdata->vif.type = type;
1187                 sdata->vif.p2p = true;
1188                 /* fall through */
1189         case NL80211_IFTYPE_AP:
1190                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1191                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1192                 break;
1193         case NL80211_IFTYPE_P2P_CLIENT:
1194                 type = NL80211_IFTYPE_STATION;
1195                 sdata->vif.type = type;
1196                 sdata->vif.p2p = true;
1197                 /* fall through */
1198         case NL80211_IFTYPE_STATION:
1199                 ieee80211_sta_setup_sdata(sdata);
1200                 break;
1201         case NL80211_IFTYPE_ADHOC:
1202                 ieee80211_ibss_setup_sdata(sdata);
1203                 break;
1204         case NL80211_IFTYPE_MESH_POINT:
1205                 if (ieee80211_vif_is_mesh(&sdata->vif))
1206                         ieee80211_mesh_init_sdata(sdata);
1207                 break;
1208         case NL80211_IFTYPE_MONITOR:
1209                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1210                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1211                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1212                                       MONITOR_FLAG_OTHER_BSS;
1213                 break;
1214         case NL80211_IFTYPE_WDS:
1215         case NL80211_IFTYPE_AP_VLAN:
1216         case NL80211_IFTYPE_P2P_DEVICE:
1217                 break;
1218         case NL80211_IFTYPE_UNSPECIFIED:
1219         case NUM_NL80211_IFTYPES:
1220                 BUG();
1221                 break;
1222         }
1223
1224         ieee80211_debugfs_add_netdev(sdata);
1225 }
1226
1227 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1228                                            enum nl80211_iftype type)
1229 {
1230         struct ieee80211_local *local = sdata->local;
1231         int ret, err;
1232         enum nl80211_iftype internal_type = type;
1233         bool p2p = false;
1234
1235         ASSERT_RTNL();
1236
1237         if (!local->ops->change_interface)
1238                 return -EBUSY;
1239
1240         switch (sdata->vif.type) {
1241         case NL80211_IFTYPE_AP:
1242         case NL80211_IFTYPE_STATION:
1243         case NL80211_IFTYPE_ADHOC:
1244                 /*
1245                  * Could maybe also all others here?
1246                  * Just not sure how that interacts
1247                  * with the RX/config path e.g. for
1248                  * mesh.
1249                  */
1250                 break;
1251         default:
1252                 return -EBUSY;
1253         }
1254
1255         switch (type) {
1256         case NL80211_IFTYPE_AP:
1257         case NL80211_IFTYPE_STATION:
1258         case NL80211_IFTYPE_ADHOC:
1259                 /*
1260                  * Could probably support everything
1261                  * but WDS here (WDS do_open can fail
1262                  * under memory pressure, which this
1263                  * code isn't prepared to handle).
1264                  */
1265                 break;
1266         case NL80211_IFTYPE_P2P_CLIENT:
1267                 p2p = true;
1268                 internal_type = NL80211_IFTYPE_STATION;
1269                 break;
1270         case NL80211_IFTYPE_P2P_GO:
1271                 p2p = true;
1272                 internal_type = NL80211_IFTYPE_AP;
1273                 break;
1274         default:
1275                 return -EBUSY;
1276         }
1277
1278         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1279         if (ret)
1280                 return ret;
1281
1282         ieee80211_do_stop(sdata, false);
1283
1284         ieee80211_teardown_sdata(sdata);
1285
1286         ret = drv_change_interface(local, sdata, internal_type, p2p);
1287         if (ret)
1288                 type = sdata->vif.type;
1289
1290         /*
1291          * Ignore return value here, there's not much we can do since
1292          * the driver changed the interface type internally already.
1293          * The warnings will hopefully make driver authors fix it :-)
1294          */
1295         ieee80211_check_queues(sdata);
1296
1297         ieee80211_setup_sdata(sdata, type);
1298
1299         err = ieee80211_do_open(&sdata->wdev, false);
1300         WARN(err, "type change: do_open returned %d", err);
1301
1302         return ret;
1303 }
1304
1305 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1306                              enum nl80211_iftype type)
1307 {
1308         int ret;
1309
1310         ASSERT_RTNL();
1311
1312         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1313                 return 0;
1314
1315         if (ieee80211_sdata_running(sdata)) {
1316                 ret = ieee80211_runtime_change_iftype(sdata, type);
1317                 if (ret)
1318                         return ret;
1319         } else {
1320                 /* Purge and reset type-dependent state. */
1321                 ieee80211_teardown_sdata(sdata);
1322                 ieee80211_setup_sdata(sdata, type);
1323         }
1324
1325         /* reset some values that shouldn't be kept across type changes */
1326         sdata->drop_unencrypted = 0;
1327         if (type == NL80211_IFTYPE_STATION)
1328                 sdata->u.mgd.use_4addr = false;
1329
1330         return 0;
1331 }
1332
1333 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1334                                        u8 *perm_addr, enum nl80211_iftype type)
1335 {
1336         struct ieee80211_sub_if_data *sdata;
1337         u64 mask, start, addr, val, inc;
1338         u8 *m;
1339         u8 tmp_addr[ETH_ALEN];
1340         int i;
1341
1342         /* default ... something at least */
1343         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1344
1345         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1346             local->hw.wiphy->n_addresses <= 1)
1347                 return;
1348
1349         mutex_lock(&local->iflist_mtx);
1350
1351         switch (type) {
1352         case NL80211_IFTYPE_MONITOR:
1353                 /* doesn't matter */
1354                 break;
1355         case NL80211_IFTYPE_WDS:
1356         case NL80211_IFTYPE_AP_VLAN:
1357                 /* match up with an AP interface */
1358                 list_for_each_entry(sdata, &local->interfaces, list) {
1359                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1360                                 continue;
1361                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1362                         break;
1363                 }
1364                 /* keep default if no AP interface present */
1365                 break;
1366         case NL80211_IFTYPE_P2P_CLIENT:
1367         case NL80211_IFTYPE_P2P_GO:
1368                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1369                         list_for_each_entry(sdata, &local->interfaces, list) {
1370                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1371                                         continue;
1372                                 if (!ieee80211_sdata_running(sdata))
1373                                         continue;
1374                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1375                                 goto out_unlock;
1376                         }
1377                 }
1378                 /* otherwise fall through */
1379         default:
1380                 /* assign a new address if possible -- try n_addresses first */
1381                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1382                         bool used = false;
1383
1384                         list_for_each_entry(sdata, &local->interfaces, list) {
1385                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1386                                            sdata->vif.addr, ETH_ALEN) == 0) {
1387                                         used = true;
1388                                         break;
1389                                 }
1390                         }
1391
1392                         if (!used) {
1393                                 memcpy(perm_addr,
1394                                        local->hw.wiphy->addresses[i].addr,
1395                                        ETH_ALEN);
1396                                 break;
1397                         }
1398                 }
1399
1400                 /* try mask if available */
1401                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1402                         break;
1403
1404                 m = local->hw.wiphy->addr_mask;
1405                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1406                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1407                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1408
1409                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1410                         /* not a contiguous mask ... not handled now! */
1411                         pr_info("not contiguous\n");
1412                         break;
1413                 }
1414
1415                 m = local->hw.wiphy->perm_addr;
1416                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1417                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1418                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1419
1420                 inc = 1ULL<<__ffs64(mask);
1421                 val = (start & mask);
1422                 addr = (start & ~mask) | (val & mask);
1423                 do {
1424                         bool used = false;
1425
1426                         tmp_addr[5] = addr >> 0*8;
1427                         tmp_addr[4] = addr >> 1*8;
1428                         tmp_addr[3] = addr >> 2*8;
1429                         tmp_addr[2] = addr >> 3*8;
1430                         tmp_addr[1] = addr >> 4*8;
1431                         tmp_addr[0] = addr >> 5*8;
1432
1433                         val += inc;
1434
1435                         list_for_each_entry(sdata, &local->interfaces, list) {
1436                                 if (memcmp(tmp_addr, sdata->vif.addr,
1437                                                         ETH_ALEN) == 0) {
1438                                         used = true;
1439                                         break;
1440                                 }
1441                         }
1442
1443                         if (!used) {
1444                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1445                                 break;
1446                         }
1447                         addr = (start & ~mask) | (val & mask);
1448                 } while (addr != start);
1449
1450                 break;
1451         }
1452
1453  out_unlock:
1454         mutex_unlock(&local->iflist_mtx);
1455 }
1456
1457 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1458                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1459                      struct vif_params *params)
1460 {
1461         struct net_device *ndev = NULL;
1462         struct ieee80211_sub_if_data *sdata = NULL;
1463         int ret, i;
1464         int txqs = 1;
1465
1466         ASSERT_RTNL();
1467
1468         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1469                 struct wireless_dev *wdev;
1470
1471                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1472                                 GFP_KERNEL);
1473                 if (!sdata)
1474                         return -ENOMEM;
1475                 wdev = &sdata->wdev;
1476
1477                 sdata->dev = NULL;
1478                 strlcpy(sdata->name, name, IFNAMSIZ);
1479                 ieee80211_assign_perm_addr(local, wdev->address, type);
1480                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1481         } else {
1482                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1483                         txqs = IEEE80211_NUM_ACS;
1484
1485                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1486                                         local->hw.vif_data_size,
1487                                         name, ieee80211_if_setup, txqs, 1);
1488                 if (!ndev)
1489                         return -ENOMEM;
1490                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1491
1492                 ndev->needed_headroom = local->tx_headroom +
1493                                         4*6 /* four MAC addresses */
1494                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1495                                         + 6 /* mesh */
1496                                         + 8 /* rfc1042/bridge tunnel */
1497                                         - ETH_HLEN /* ethernet hard_header_len */
1498                                         + IEEE80211_ENCRYPT_HEADROOM;
1499                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1500
1501                 ret = dev_alloc_name(ndev, ndev->name);
1502                 if (ret < 0) {
1503                         free_netdev(ndev);
1504                         return ret;
1505                 }
1506
1507                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1508                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1509                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1510
1511                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1512                 sdata = netdev_priv(ndev);
1513                 ndev->ieee80211_ptr = &sdata->wdev;
1514                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1515                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1516
1517                 sdata->dev = ndev;
1518         }
1519
1520         /* initialise type-independent data */
1521         sdata->wdev.wiphy = local->hw.wiphy;
1522         sdata->local = local;
1523 #ifdef CONFIG_INET
1524         sdata->arp_filter_state = true;
1525 #endif
1526
1527         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1528                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1529
1530         INIT_LIST_HEAD(&sdata->key_list);
1531
1532         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1533                 struct ieee80211_supported_band *sband;
1534                 sband = local->hw.wiphy->bands[i];
1535                 sdata->rc_rateidx_mask[i] =
1536                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1537                 if (sband)
1538                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1539                                sband->ht_cap.mcs.rx_mask,
1540                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1541                 else
1542                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1543                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1544         }
1545
1546         ieee80211_set_default_queues(sdata);
1547
1548         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1549         sdata->user_power_level = local->user_power_level;
1550
1551         /* setup type-dependent data */
1552         ieee80211_setup_sdata(sdata, type);
1553
1554         if (ndev) {
1555                 if (params) {
1556                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1557                         if (type == NL80211_IFTYPE_STATION)
1558                                 sdata->u.mgd.use_4addr = params->use_4addr;
1559                 }
1560
1561                 ndev->features |= local->hw.netdev_features;
1562
1563                 ret = register_netdevice(ndev);
1564                 if (ret) {
1565                         free_netdev(ndev);
1566                         return ret;
1567                 }
1568         }
1569
1570         mutex_lock(&local->iflist_mtx);
1571         list_add_tail_rcu(&sdata->list, &local->interfaces);
1572         mutex_unlock(&local->iflist_mtx);
1573
1574         if (new_wdev)
1575                 *new_wdev = &sdata->wdev;
1576
1577         return 0;
1578 }
1579
1580 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1581 {
1582         ASSERT_RTNL();
1583
1584         mutex_lock(&sdata->local->iflist_mtx);
1585         list_del_rcu(&sdata->list);
1586         mutex_unlock(&sdata->local->iflist_mtx);
1587
1588         synchronize_rcu();
1589
1590         if (sdata->dev) {
1591                 unregister_netdevice(sdata->dev);
1592         } else {
1593                 cfg80211_unregister_wdev(&sdata->wdev);
1594                 kfree(sdata);
1595         }
1596 }
1597
1598 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1599 {
1600         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1601                 return;
1602         ieee80211_do_stop(sdata, true);
1603         ieee80211_teardown_sdata(sdata);
1604 }
1605
1606 /*
1607  * Remove all interfaces, may only be called at hardware unregistration
1608  * time because it doesn't do RCU-safe list removals.
1609  */
1610 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1611 {
1612         struct ieee80211_sub_if_data *sdata, *tmp;
1613         LIST_HEAD(unreg_list);
1614         LIST_HEAD(wdev_list);
1615
1616         ASSERT_RTNL();
1617
1618         mutex_lock(&local->iflist_mtx);
1619         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1620                 list_del(&sdata->list);
1621
1622                 if (sdata->dev)
1623                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1624                 else
1625                         list_add(&sdata->list, &wdev_list);
1626         }
1627         mutex_unlock(&local->iflist_mtx);
1628         unregister_netdevice_many(&unreg_list);
1629         list_del(&unreg_list);
1630
1631         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1632                 list_del(&sdata->list);
1633                 cfg80211_unregister_wdev(&sdata->wdev);
1634                 kfree(sdata);
1635         }
1636 }
1637
1638 static int netdev_notify(struct notifier_block *nb,
1639                          unsigned long state,
1640                          void *ndev)
1641 {
1642         struct net_device *dev = ndev;
1643         struct ieee80211_sub_if_data *sdata;
1644
1645         if (state != NETDEV_CHANGENAME)
1646                 return 0;
1647
1648         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1649                 return 0;
1650
1651         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1652                 return 0;
1653
1654         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1655
1656         memcpy(sdata->name, dev->name, IFNAMSIZ);
1657
1658         ieee80211_debugfs_rename_netdev(sdata);
1659         return 0;
1660 }
1661
1662 static struct notifier_block mac80211_netdev_notifier = {
1663         .notifier_call = netdev_notify,
1664 };
1665
1666 int ieee80211_iface_init(void)
1667 {
1668         return register_netdevice_notifier(&mac80211_netdev_notifier);
1669 }
1670
1671 void ieee80211_iface_exit(void)
1672 {
1673         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1674 }