net/mac80211/iface.c

   1 /*
   2  * Interface handling
   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->def.chan->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 {
  83         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  84                 return 0;
  85
  86         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  87         return IEEE80211_CONF_CHANGE_IDLE;
  88 }
  89
  90 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  91 {
  92         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  93                 return 0;
  94
  95         ieee80211_flush_queues(local, NULL);
  96
  97         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
  98         return IEEE80211_CONF_CHANGE_IDLE;
  99 }
 100
 101 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
 102                                    bool force_active)
 103 {
 104         bool working = false, scanning, active;
 105         unsigned int led_trig_start = 0, led_trig_stop = 0;
 106         struct ieee80211_roc_work *roc;
 107
 108         lockdep_assert_held(&local->mtx);
 109
 110         active = force_active ||
 111                  !list_empty(&local->chanctx_list) ||
 112                  local->monitors;
 113
 114         if (!local->ops->remain_on_channel) {
 115                 list_for_each_entry(roc, &local->roc_list, list) {
 116                         working = true;
 117                         break;
 118                 }
 119         }
 120
 121         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 122                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 123
 124         if (working || scanning)
 125                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 126         else
 127                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 128
 129         if (active)
 130                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 131         else
 132                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 133
 134         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 135
 136         if (working || scanning || active)
 137                 return __ieee80211_idle_off(local);
 138         return __ieee80211_idle_on(local);
 139 }
 140
 141 u32 ieee80211_idle_off(struct ieee80211_local *local)
 142 {
 143         return __ieee80211_recalc_idle(local, true);
 144 }
 145
 146 void ieee80211_recalc_idle(struct ieee80211_local *local)
 147 {
 148         u32 change = __ieee80211_recalc_idle(local, false);
 149         if (change)
 150                 ieee80211_hw_config(local, change);
 151 }
 152
 153 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 154 {
 155         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
 156                 return -EINVAL;
 157
 158         dev->mtu = new_mtu;
 159         return 0;
 160 }
 161
 162 static int ieee80211_verify_mac(struct ieee80211_local *local, u8 *addr)
 163 {
 164         struct ieee80211_sub_if_data *sdata;
 165         u64 new, mask, tmp;
 166         u8 *m;
 167         int ret = 0;
 168
 169         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 170                 return 0;
 171
 172         m = addr;
 173         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 174                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 175                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 176
 177         m = local->hw.wiphy->addr_mask;
 178         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 179                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 180                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 181
 182
 183         mutex_lock(&local->iflist_mtx);
 184         list_for_each_entry(sdata, &local->interfaces, list) {
 185                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
 186                         continue;
 187
 188                 m = sdata->vif.addr;
 189                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 190                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 191                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 192
 193                 if ((new & ~mask) != (tmp & ~mask)) {
 194                         ret = -EINVAL;
 195                         break;
 196                 }
 197         }
 198         mutex_unlock(&local->iflist_mtx);
 199
 200         return ret;
 201 }
 202
 203 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 204 {
 205         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 206         struct sockaddr *sa = addr;
 207         int ret;
 208
 209         if (ieee80211_sdata_running(sdata))
 210                 return -EBUSY;
 211
 212         ret = ieee80211_verify_mac(sdata->local, sa->sa_data);
 213         if (ret)
 214                 return ret;
 215
 216         ret = eth_mac_addr(dev, sa);
 217
 218         if (ret == 0)
 219                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 220
 221         return ret;
 222 }
 223
 224 static inline int identical_mac_addr_allowed(int type1, int type2)
 225 {
 226         return type1 == NL80211_IFTYPE_MONITOR ||
 227                 type2 == NL80211_IFTYPE_MONITOR ||
 228                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 229                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 230                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 231                 (type1 == NL80211_IFTYPE_WDS &&
 232                         (type2 == NL80211_IFTYPE_WDS ||
 233                          type2 == NL80211_IFTYPE_AP)) ||
 234                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 235                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 236                         (type2 == NL80211_IFTYPE_AP ||
 237                          type2 == NL80211_IFTYPE_AP_VLAN));
 238 }
 239
 240 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 241                                             enum nl80211_iftype iftype)
 242 {
 243         struct ieee80211_local *local = sdata->local;
 244         struct ieee80211_sub_if_data *nsdata;
 245
 246         ASSERT_RTNL();
 247
 248         /* we hold the RTNL here so can safely walk the list */
 249         list_for_each_entry(nsdata, &local->interfaces, list) {
 250                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 251                         /*
 252                          * Allow only a single IBSS interface to be up at any
 253                          * time. This is restricted because beacon distribution
 254                          * cannot work properly if both are in the same IBSS.
 255                          *
 256                          * To remove this restriction we'd have to disallow them
 257                          * from setting the same SSID on different IBSS interfaces
 258                          * belonging to the same hardware. Then, however, we're
 259                          * faced with having to adopt two different TSF timers...
 260                          */
 261                         if (iftype == NL80211_IFTYPE_ADHOC &&
 262                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 263                                 return -EBUSY;
 264
 265                         /*
 266                          * The remaining checks are only performed for interfaces
 267                          * with the same MAC address.
 268                          */
 269                         if (!ether_addr_equal(sdata->vif.addr,
 270                                               nsdata->vif.addr))
 271                                 continue;
 272
 273                         /*
 274                          * check whether it may have the same address
 275                          */
 276                         if (!identical_mac_addr_allowed(iftype,
 277                                                         nsdata->vif.type))
 278                                 return -ENOTUNIQ;
 279
 280                         /*
 281                          * can only add VLANs to enabled APs
 282                          */
 283                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 284                             nsdata->vif.type == NL80211_IFTYPE_AP)
 285                                 sdata->bss = &nsdata->u.ap;
 286                 }
 287         }
 288
 289         return 0;
 290 }
 291
 292 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
 293 {
 294         int n_queues = sdata->local->hw.queues;
 295         int i;
 296
 297         if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
 298                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 299                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 300                                          IEEE80211_INVAL_HW_QUEUE))
 301                                 return -EINVAL;
 302                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 303                                          n_queues))
 304                                 return -EINVAL;
 305                 }
 306         }
 307
 308         if ((sdata->vif.type != NL80211_IFTYPE_AP &&
 309              sdata->vif.type != NL80211_IFTYPE_MESH_POINT) ||
 310             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
 311                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 312                 return 0;
 313         }
 314
 315         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 316                 return -EINVAL;
 317
 318         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 319                 return -EINVAL;
 320
 321         return 0;
 322 }
 323
 324 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 325                                     const int offset)
 326 {
 327         struct ieee80211_local *local = sdata->local;
 328         u32 flags = sdata->u.mntr_flags;
 329
 330 #define ADJUST(_f, _s)  do {                                    \
 331         if (flags & MONITOR_FLAG_##_f)                          \
 332                 local->fif_##_s += offset;                      \
 333         } while (0)
 334
 335         ADJUST(FCSFAIL, fcsfail);
 336         ADJUST(PLCPFAIL, plcpfail);
 337         ADJUST(CONTROL, control);
 338         ADJUST(CONTROL, pspoll);
 339         ADJUST(OTHER_BSS, other_bss);
 340
 341 #undef ADJUST
 342 }
 343
 344 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 345 {
 346         struct ieee80211_local *local = sdata->local;
 347         int i;
 348
 349         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 350                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
 351                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 352                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 353                         sdata->vif.hw_queue[i] = i;
 354                 else
 355                         sdata->vif.hw_queue[i] = 0;
 356         }
 357         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 358 }
 359
 360 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 361 {
 362         struct ieee80211_sub_if_data *sdata;
 363         int ret;
 364
 365         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 366                 return 0;
 367
 368         ASSERT_RTNL();
 369
 370         if (local->monitor_sdata)
 371                 return 0;
 372
 373         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 374         if (!sdata)
 375                 return -ENOMEM;
 376
 377         /* set up data */
 378         sdata->local = local;
 379         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 380         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 381                  wiphy_name(local->hw.wiphy));
 382
 383         ieee80211_set_default_queues(sdata);
 384
 385         ret = drv_add_interface(local, sdata);
 386         if (WARN_ON(ret)) {
 387                 /* ok .. stupid driver, it asked for this! */
 388                 kfree(sdata);
 389                 return ret;
 390         }
 391
 392         ret = ieee80211_check_queues(sdata);
 393         if (ret) {
 394                 kfree(sdata);
 395                 return ret;
 396         }
 397
 398         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 399                                         IEEE80211_CHANCTX_EXCLUSIVE);
 400         if (ret) {
 401                 drv_remove_interface(local, sdata);
 402                 kfree(sdata);
 403                 return ret;
 404         }
 405
 406         mutex_lock(&local->iflist_mtx);
 407         rcu_assign_pointer(local->monitor_sdata, sdata);
 408         mutex_unlock(&local->iflist_mtx);
 409
 410         return 0;
 411 }
 412
 413 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 414 {
 415         struct ieee80211_sub_if_data *sdata;
 416
 417         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 418                 return;
 419
 420         ASSERT_RTNL();
 421
 422         mutex_lock(&local->iflist_mtx);
 423
 424         sdata = rcu_dereference_protected(local->monitor_sdata,
 425                                           lockdep_is_held(&local->iflist_mtx));
 426         if (!sdata) {
 427                 mutex_unlock(&local->iflist_mtx);
 428                 return;
 429         }
 430
 431         rcu_assign_pointer(local->monitor_sdata, NULL);
 432         mutex_unlock(&local->iflist_mtx);
 433
 434         synchronize_net();
 435
 436         ieee80211_vif_release_channel(sdata);
 437
 438         drv_remove_interface(local, sdata);
 439
 440         kfree(sdata);
 441 }
 442
 443 /*
 444  * NOTE: Be very careful when changing this function, it must NOT return
 445  * an error on interface type changes that have been pre-checked, so most
 446  * checks should be in ieee80211_check_concurrent_iface.
 447  */
 448 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 449 {
 450         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 451         struct net_device *dev = wdev->netdev;
 452         struct ieee80211_local *local = sdata->local;
 453         struct sta_info *sta;
 454         u32 changed = 0;
 455         int res;
 456         u32 hw_reconf_flags = 0;
 457
 458         switch (sdata->vif.type) {
 459         case NL80211_IFTYPE_WDS:
 460                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 461                         return -ENOLINK;
 462                 break;
 463         case NL80211_IFTYPE_AP_VLAN: {
 464                 struct ieee80211_sub_if_data *master;
 465
 466                 if (!sdata->bss)
 467                         return -ENOLINK;
 468
 469                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 470
 471                 master = container_of(sdata->bss,
 472                                       struct ieee80211_sub_if_data, u.ap);
 473                 sdata->control_port_protocol =
 474                         master->control_port_protocol;
 475                 sdata->control_port_no_encrypt =
 476                         master->control_port_no_encrypt;
 477                 break;
 478                 }
 479         case NL80211_IFTYPE_AP:
 480                 sdata->bss = &sdata->u.ap;
 481                 break;
 482         case NL80211_IFTYPE_MESH_POINT:
 483         case NL80211_IFTYPE_STATION:
 484         case NL80211_IFTYPE_MONITOR:
 485         case NL80211_IFTYPE_ADHOC:
 486         case NL80211_IFTYPE_P2P_DEVICE:
 487                 /* no special treatment */
 488                 break;
 489         case NL80211_IFTYPE_UNSPECIFIED:
 490         case NUM_NL80211_IFTYPES:
 491         case NL80211_IFTYPE_P2P_CLIENT:
 492         case NL80211_IFTYPE_P2P_GO:
 493                 /* cannot happen */
 494                 WARN_ON(1);
 495                 break;
 496         }
 497
 498         if (local->open_count == 0) {
 499                 res = drv_start(local);
 500                 if (res)
 501                         goto err_del_bss;
 502                 /* we're brought up, everything changes */
 503                 hw_reconf_flags = ~0;
 504                 ieee80211_led_radio(local, true);
 505                 ieee80211_mod_tpt_led_trig(local,
 506                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 507         }
 508
 509         /*
 510          * Copy the hopefully now-present MAC address to
 511          * this interface, if it has the special null one.
 512          */
 513         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 514                 memcpy(dev->dev_addr,
 515                        local->hw.wiphy->perm_addr,
 516                        ETH_ALEN);
 517                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 518
 519                 if (!is_valid_ether_addr(dev->dev_addr)) {
 520                         res = -EADDRNOTAVAIL;
 521                         goto err_stop;
 522                 }
 523         }
 524
 525         switch (sdata->vif.type) {
 526         case NL80211_IFTYPE_AP_VLAN:
 527                 /* no need to tell driver, but set carrier and chanctx */
 528                 if (rtnl_dereference(sdata->bss->beacon)) {
 529                         ieee80211_vif_vlan_copy_chanctx(sdata);
 530                         netif_carrier_on(dev);
 531                 } else {
 532                         netif_carrier_off(dev);
 533                 }
 534                 break;
 535         case NL80211_IFTYPE_MONITOR:
 536                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 537                         local->cooked_mntrs++;
 538                         break;
 539                 }
 540
 541                 if (local->monitors == 0 && local->open_count == 0) {
 542                         res = ieee80211_add_virtual_monitor(local);
 543                         if (res)
 544                                 goto err_stop;
 545                 }
 546
 547                 /* must be before the call to ieee80211_configure_filter */
 548                 local->monitors++;
 549                 if (local->monitors == 1) {
 550                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 551                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 552                 }
 553
 554                 ieee80211_adjust_monitor_flags(sdata, 1);
 555                 ieee80211_configure_filter(local);
 556                 mutex_lock(&local->mtx);
 557                 ieee80211_recalc_idle(local);
 558                 mutex_unlock(&local->mtx);
 559
 560                 netif_carrier_on(dev);
 561                 break;
 562         default:
 563                 if (coming_up) {
 564                         ieee80211_del_virtual_monitor(local);
 565
 566                         res = drv_add_interface(local, sdata);
 567                         if (res)
 568                                 goto err_stop;
 569                         res = ieee80211_check_queues(sdata);
 570                         if (res)
 571                                 goto err_del_interface;
 572                 }
 573
 574                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 575                         local->fif_pspoll++;
 576                         local->fif_probe_req++;
 577
 578                         ieee80211_configure_filter(local);
 579                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 580                         local->fif_probe_req++;
 581                 }
 582
 583                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 584                         changed |= ieee80211_reset_erp_info(sdata);
 585                 ieee80211_bss_info_change_notify(sdata, changed);
 586
 587                 switch (sdata->vif.type) {
 588                 case NL80211_IFTYPE_STATION:
 589                 case NL80211_IFTYPE_ADHOC:
 590                 case NL80211_IFTYPE_AP:
 591                 case NL80211_IFTYPE_MESH_POINT:
 592                         netif_carrier_off(dev);
 593                         break;
 594                 case NL80211_IFTYPE_WDS:
 595                 case NL80211_IFTYPE_P2P_DEVICE:
 596                         break;
 597                 default:
 598                         /* not reached */
 599                         WARN_ON(1);
 600                 }
 601
 602                 /*
 603                  * set default queue parameters so drivers don't
 604                  * need to initialise the hardware if the hardware
 605                  * doesn't start up with sane defaults
 606                  */
 607                 ieee80211_set_wmm_default(sdata, true);
 608         }
 609
 610         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 611
 612         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 613                 /* Create STA entry for the WDS peer */
 614                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 615                                      GFP_KERNEL);
 616                 if (!sta) {
 617                         res = -ENOMEM;
 618                         goto err_del_interface;
 619                 }
 620
 621                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 622                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 623                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 624
 625                 res = sta_info_insert(sta);
 626                 if (res) {
 627                         /* STA has been freed */
 628                         goto err_del_interface;
 629                 }
 630
 631                 rate_control_rate_init(sta);
 632                 netif_carrier_on(dev);
 633         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 634                 rcu_assign_pointer(local->p2p_sdata, sdata);
 635         }
 636
 637         /*
 638          * set_multicast_list will be invoked by the networking core
 639          * which will check whether any increments here were done in
 640          * error and sync them down to the hardware as filter flags.
 641          */
 642         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 643                 atomic_inc(&local->iff_allmultis);
 644
 645         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 646                 atomic_inc(&local->iff_promiscs);
 647
 648         if (coming_up)
 649                 local->open_count++;
 650
 651         if (hw_reconf_flags)
 652                 ieee80211_hw_config(local, hw_reconf_flags);
 653
 654         ieee80211_recalc_ps(local, -1);
 655
 656         if (dev) {
 657                 unsigned long flags;
 658                 int n_acs = IEEE80211_NUM_ACS;
 659                 int ac;
 660
 661                 if (local->hw.queues < IEEE80211_NUM_ACS)
 662                         n_acs = 1;
 663
 664                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 665                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 666                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 667                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 668                         for (ac = 0; ac < n_acs; ac++) {
 669                                 int ac_queue = sdata->vif.hw_queue[ac];
 670
 671                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 672                                     skb_queue_empty(&local->pending[ac_queue]))
 673                                         netif_start_subqueue(dev, ac);
 674                         }
 675                 }
 676                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 677         }
 678
 679         return 0;
 680  err_del_interface:
 681         drv_remove_interface(local, sdata);
 682  err_stop:
 683         if (!local->open_count)
 684                 drv_stop(local);
 685  err_del_bss:
 686         sdata->bss = NULL;
 687         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 688                 list_del(&sdata->u.vlan.list);
 689         /* might already be clear but that doesn't matter */
 690         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 691         return res;
 692 }
 693
 694 static int ieee80211_open(struct net_device *dev)
 695 {
 696         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 697         int err;
 698
 699         /* fail early if user set an invalid address */
 700         if (!is_valid_ether_addr(dev->dev_addr))
 701                 return -EADDRNOTAVAIL;
 702
 703         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 704         if (err)
 705                 return err;
 706
 707         return ieee80211_do_open(&sdata->wdev, true);
 708 }
 709
 710 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 711                               bool going_down)
 712 {
 713         struct ieee80211_local *local = sdata->local;
 714         unsigned long flags;
 715         struct sk_buff *skb, *tmp;
 716         u32 hw_reconf_flags = 0;
 717         int i, flushed;
 718         struct ps_data *ps;
 719
 720         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 721
 722         if (rcu_access_pointer(local->scan_sdata) == sdata)
 723                 ieee80211_scan_cancel(local);
 724
 725         /*
 726          * Stop TX on this interface first.
 727          */
 728         if (sdata->dev)
 729                 netif_tx_stop_all_queues(sdata->dev);
 730
 731         ieee80211_roc_purge(local, sdata);
 732
 733         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 734                 ieee80211_mgd_stop(sdata);
 735
 736         /*
 737          * Remove all stations associated with this interface.
 738          *
 739          * This must be done before calling ops->remove_interface()
 740          * because otherwise we can later invoke ops->sta_notify()
 741          * whenever the STAs are removed, and that invalidates driver
 742          * assumptions about always getting a vif pointer that is valid
 743          * (because if we remove a STA after ops->remove_interface()
 744          * the driver will have removed the vif info already!)
 745          *
 746          * This is relevant only in WDS mode, in all other modes we've
 747          * already removed all stations when disconnecting or similar,
 748          * so warn otherwise.
 749          *
 750          * We call sta_info_flush_cleanup() later, to combine RCU waits.
 751          */
 752         flushed = sta_info_flush_defer(sdata);
 753         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 754                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
 755
 756         /* don't count this interface for promisc/allmulti while it is down */
 757         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 758                 atomic_dec(&local->iff_allmultis);
 759
 760         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 761                 atomic_dec(&local->iff_promiscs);
 762
 763         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 764                 local->fif_pspoll--;
 765                 local->fif_probe_req--;
 766         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 767                 local->fif_probe_req--;
 768         }
 769
 770         if (sdata->dev) {
 771                 netif_addr_lock_bh(sdata->dev);
 772                 spin_lock_bh(&local->filter_lock);
 773                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 774                                  sdata->dev->addr_len);
 775                 spin_unlock_bh(&local->filter_lock);
 776                 netif_addr_unlock_bh(sdata->dev);
 777         }
 778
 779         del_timer_sync(&local->dynamic_ps_timer);
 780         cancel_work_sync(&local->dynamic_ps_enable_work);
 781
 782         cancel_work_sync(&sdata->recalc_smps);
 783
 784         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 785
 786         if (sdata->wdev.cac_started) {
 787                 WARN_ON(local->suspended);
 788                 mutex_lock(&local->iflist_mtx);
 789                 ieee80211_vif_release_channel(sdata);
 790                 mutex_unlock(&local->iflist_mtx);
 791                 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
 792                                    GFP_KERNEL);
 793         }
 794
 795         /* APs need special treatment */
 796         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 797                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 798
 799                 /* down all dependent devices, that is VLANs */
 800                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 801                                          u.vlan.list)
 802                         dev_close(vlan->dev);
 803                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 804         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 805                 /* remove all packets in parent bc_buf pointing to this dev */
 806                 ps = &sdata->bss->ps;
 807
 808                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 809                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 810                         if (skb->dev == sdata->dev) {
 811                                 __skb_unlink(skb, &ps->bc_buf);
 812                                 local->total_ps_buffered--;
 813                                 ieee80211_free_txskb(&local->hw, skb);
 814                         }
 815                 }
 816                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 817         }
 818
 819         if (going_down)
 820                 local->open_count--;
 821
 822         switch (sdata->vif.type) {
 823         case NL80211_IFTYPE_AP_VLAN:
 824                 list_del(&sdata->u.vlan.list);
 825                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
 826                 /* no need to tell driver */
 827                 break;
 828         case NL80211_IFTYPE_MONITOR:
 829                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 830                         local->cooked_mntrs--;
 831                         break;
 832                 }
 833
 834                 local->monitors--;
 835                 if (local->monitors == 0) {
 836                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 837                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 838                 }
 839
 840                 ieee80211_adjust_monitor_flags(sdata, -1);
 841                 break;
 842         case NL80211_IFTYPE_P2P_DEVICE:
 843                 /* relies on synchronize_rcu() below */
 844                 rcu_assign_pointer(local->p2p_sdata, NULL);
 845                 /* fall through */
 846         default:
 847                 cancel_work_sync(&sdata->work);
 848                 /*
 849                  * When we get here, the interface is marked down.
 850                  *
 851                  * sta_info_flush_cleanup() requires rcu_barrier()
 852                  * first to wait for the station call_rcu() calls
 853                  * to complete, and we also need synchronize_rcu()
 854                  * to wait for the RX path in case it is using the
 855                  * interface and enqueuing frames at this very time on
 856                  * another CPU.
 857                  */
 858                 synchronize_rcu();
 859                 rcu_barrier();
 860                 sta_info_flush_cleanup(sdata);
 861
 862                 /*
 863                  * Free all remaining keys, there shouldn't be any,
 864                  * except maybe in WDS mode?
 865                  */
 866                 ieee80211_free_keys(sdata);
 867
 868                 /* fall through */
 869         case NL80211_IFTYPE_AP:
 870                 skb_queue_purge(&sdata->skb_queue);
 871         }
 872
 873         sdata->bss = NULL;
 874
 875         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 876         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 877                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 878                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 879                         if (info->control.vif == &sdata->vif) {
 880                                 __skb_unlink(skb, &local->pending[i]);
 881                                 ieee80211_free_txskb(&local->hw, skb);
 882                         }
 883                 }
 884         }
 885         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 886
 887         if (local->open_count == 0)
 888                 ieee80211_clear_tx_pending(local);
 889
 890         /*
 891          * If the interface goes down while suspended, presumably because
 892          * the device was unplugged and that happens before our resume,
 893          * then the driver is already unconfigured and the remainder of
 894          * this function isn't needed.
 895          * XXX: what about WoWLAN? If the device has software state, e.g.
 896          *      memory allocated, it might expect teardown commands from
 897          *      mac80211 here?
 898          */
 899         if (local->suspended) {
 900                 WARN_ON(local->wowlan);
 901                 WARN_ON(rtnl_dereference(local->monitor_sdata));
 902                 return;
 903         }
 904
 905         switch (sdata->vif.type) {
 906         case NL80211_IFTYPE_AP_VLAN:
 907                 break;
 908         case NL80211_IFTYPE_MONITOR:
 909                 if (local->monitors == 0)
 910                         ieee80211_del_virtual_monitor(local);
 911
 912                 mutex_lock(&local->mtx);
 913                 ieee80211_recalc_idle(local);
 914                 mutex_unlock(&local->mtx);
 915                 break;
 916         default:
 917                 if (going_down)
 918                         drv_remove_interface(local, sdata);
 919         }
 920
 921         ieee80211_recalc_ps(local, -1);
 922
 923         if (local->open_count == 0) {
 924                 ieee80211_stop_device(local);
 925
 926                 /* no reconfiguring after stop! */
 927                 return;
 928         }
 929
 930         /* do after stop to avoid reconfiguring when we stop anyway */
 931         ieee80211_configure_filter(local);
 932         ieee80211_hw_config(local, hw_reconf_flags);
 933
 934         if (local->monitors == local->open_count)
 935                 ieee80211_add_virtual_monitor(local);
 936 }
 937
 938 static int ieee80211_stop(struct net_device *dev)
 939 {
 940         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 941
 942         ieee80211_do_stop(sdata, true);
 943
 944         return 0;
 945 }
 946
 947 static void ieee80211_set_multicast_list(struct net_device *dev)
 948 {
 949         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 950         struct ieee80211_local *local = sdata->local;
 951         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 952
 953         allmulti = !!(dev->flags & IFF_ALLMULTI);
 954         promisc = !!(dev->flags & IFF_PROMISC);
 955         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 956         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 957
 958         if (allmulti != sdata_allmulti) {
 959                 if (dev->flags & IFF_ALLMULTI)
 960                         atomic_inc(&local->iff_allmultis);
 961                 else
 962                         atomic_dec(&local->iff_allmultis);
 963                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 964         }
 965
 966         if (promisc != sdata_promisc) {
 967                 if (dev->flags & IFF_PROMISC)
 968                         atomic_inc(&local->iff_promiscs);
 969                 else
 970                         atomic_dec(&local->iff_promiscs);
 971                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 972         }
 973
 974         /*
 975          * TODO: If somebody needs this on AP interfaces,
 976          *       it can be enabled easily but multicast
 977          *       addresses from VLANs need to be synced.
 978          */
 979         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 980             sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
 981             sdata->vif.type != NL80211_IFTYPE_AP)
 982                 drv_set_multicast_list(local, sdata, &dev->mc);
 983
 984         spin_lock_bh(&local->filter_lock);
 985         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 986         spin_unlock_bh(&local->filter_lock);
 987         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 988 }
 989
 990 /*
 991  * Called when the netdev is removed or, by the code below, before
 992  * the interface type changes.
 993  */
 994 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 995 {
 996         int flushed;
 997         int i;
 998
 999         /* free extra data */
1000         ieee80211_free_keys(sdata);
1001
1002         ieee80211_debugfs_remove_netdev(sdata);
1003
1004         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1005                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1006         sdata->fragment_next = 0;
1007
1008         if (ieee80211_vif_is_mesh(&sdata->vif))
1009                 mesh_rmc_free(sdata);
1010
1011         flushed = sta_info_flush(sdata);
1012         WARN_ON(flushed);
1013 }
1014
1015 static void ieee80211_uninit(struct net_device *dev)
1016 {
1017         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1018 }
1019
1020 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1021                                          struct sk_buff *skb)
1022 {
1023         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1024 }
1025
1026 static const struct net_device_ops ieee80211_dataif_ops = {
1027         .ndo_open               = ieee80211_open,
1028         .ndo_stop               = ieee80211_stop,
1029         .ndo_uninit             = ieee80211_uninit,
1030         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1031         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1032         .ndo_change_mtu         = ieee80211_change_mtu,
1033         .ndo_set_mac_address    = ieee80211_change_mac,
1034         .ndo_select_queue       = ieee80211_netdev_select_queue,
1035 };
1036
1037 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1038                                           struct sk_buff *skb)
1039 {
1040         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1041         struct ieee80211_local *local = sdata->local;
1042         struct ieee80211_hdr *hdr;
1043         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1044
1045         if (local->hw.queues < IEEE80211_NUM_ACS)
1046                 return 0;
1047
1048         if (skb->len < 4 ||
1049             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1050                 return 0; /* doesn't matter, frame will be dropped */
1051
1052         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1053
1054         return ieee80211_select_queue_80211(sdata, skb, hdr);
1055 }
1056
1057 static const struct net_device_ops ieee80211_monitorif_ops = {
1058         .ndo_open               = ieee80211_open,
1059         .ndo_stop               = ieee80211_stop,
1060         .ndo_uninit             = ieee80211_uninit,
1061         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1062         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1063         .ndo_change_mtu         = ieee80211_change_mtu,
1064         .ndo_set_mac_address    = eth_mac_addr,
1065         .ndo_select_queue       = ieee80211_monitor_select_queue,
1066 };
1067
1068 static void ieee80211_if_setup(struct net_device *dev)
1069 {
1070         ether_setup(dev);
1071         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1072         dev->netdev_ops = &ieee80211_dataif_ops;
1073         dev->destructor = free_netdev;
1074 }
1075
1076 static void ieee80211_iface_work(struct work_struct *work)
1077 {
1078         struct ieee80211_sub_if_data *sdata =
1079                 container_of(work, struct ieee80211_sub_if_data, work);
1080         struct ieee80211_local *local = sdata->local;
1081         struct sk_buff *skb;
1082         struct sta_info *sta;
1083         struct ieee80211_ra_tid *ra_tid;
1084
1085         if (!ieee80211_sdata_running(sdata))
1086                 return;
1087
1088         if (local->scanning)
1089                 return;
1090
1091         /*
1092          * ieee80211_queue_work() should have picked up most cases,
1093          * here we'll pick the rest.
1094          */
1095         if (WARN(local->suspended,
1096                  "interface work scheduled while going to suspend\n"))
1097                 return;
1098
1099         /* first process frames */
1100         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1101                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1102
1103                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1104                         ra_tid = (void *)&skb->cb;
1105                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1106                                                  ra_tid->tid);
1107                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1108                         ra_tid = (void *)&skb->cb;
1109                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1110                                                 ra_tid->tid);
1111                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1112                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1113                         int len = skb->len;
1114
1115                         mutex_lock(&local->sta_mtx);
1116                         sta = sta_info_get_bss(sdata, mgmt->sa);
1117                         if (sta) {
1118                                 switch (mgmt->u.action.u.addba_req.action_code) {
1119                                 case WLAN_ACTION_ADDBA_REQ:
1120                                         ieee80211_process_addba_request(
1121                                                         local, sta, mgmt, len);
1122                                         break;
1123                                 case WLAN_ACTION_ADDBA_RESP:
1124                                         ieee80211_process_addba_resp(local, sta,
1125                                                                      mgmt, len);
1126                                         break;
1127                                 case WLAN_ACTION_DELBA:
1128                                         ieee80211_process_delba(sdata, sta,
1129                                                                 mgmt, len);
1130                                         break;
1131                                 default:
1132                                         WARN_ON(1);
1133                                         break;
1134                                 }
1135                         }
1136                         mutex_unlock(&local->sta_mtx);
1137                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1138                         struct ieee80211_hdr *hdr = (void *)mgmt;
1139                         /*
1140                          * So the frame isn't mgmt, but frame_control
1141                          * is at the right place anyway, of course, so
1142                          * the if statement is correct.
1143                          *
1144                          * Warn if we have other data frame types here,
1145                          * they must not get here.
1146                          */
1147                         WARN_ON(hdr->frame_control &
1148                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1149                         WARN_ON(!(hdr->seq_ctrl &
1150                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1151                         /*
1152                          * This was a fragment of a frame, received while
1153                          * a block-ack session was active. That cannot be
1154                          * right, so terminate the session.
1155                          */
1156                         mutex_lock(&local->sta_mtx);
1157                         sta = sta_info_get_bss(sdata, mgmt->sa);
1158                         if (sta) {
1159                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1160                                                 IEEE80211_QOS_CTL_TID_MASK;
1161
1162                                 __ieee80211_stop_rx_ba_session(
1163                                         sta, tid, WLAN_BACK_RECIPIENT,
1164                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1165                                         true);
1166                         }
1167                         mutex_unlock(&local->sta_mtx);
1168                 } else switch (sdata->vif.type) {
1169                 case NL80211_IFTYPE_STATION:
1170                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1171                         break;
1172                 case NL80211_IFTYPE_ADHOC:
1173                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1174                         break;
1175                 case NL80211_IFTYPE_MESH_POINT:
1176                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1177                                 break;
1178                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1179                         break;
1180                 default:
1181                         WARN(1, "frame for unexpected interface type");
1182                         break;
1183                 }
1184
1185                 kfree_skb(skb);
1186         }
1187
1188         /* then other type-dependent work */
1189         switch (sdata->vif.type) {
1190         case NL80211_IFTYPE_STATION:
1191                 ieee80211_sta_work(sdata);
1192                 break;
1193         case NL80211_IFTYPE_ADHOC:
1194                 ieee80211_ibss_work(sdata);
1195                 break;
1196         case NL80211_IFTYPE_MESH_POINT:
1197                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1198                         break;
1199                 ieee80211_mesh_work(sdata);
1200                 break;
1201         default:
1202                 break;
1203         }
1204 }
1205
1206 static void ieee80211_recalc_smps_work(struct work_struct *work)
1207 {
1208         struct ieee80211_sub_if_data *sdata =
1209                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1210
1211         ieee80211_recalc_smps(sdata);
1212 }
1213
1214 /*
1215  * Helper function to initialise an interface to a specific type.
1216  */
1217 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1218                                   enum nl80211_iftype type)
1219 {
1220         /* clear type-dependent union */
1221         memset(&sdata->u, 0, sizeof(sdata->u));
1222
1223         /* and set some type-dependent values */
1224         sdata->vif.type = type;
1225         sdata->vif.p2p = false;
1226         sdata->wdev.iftype = type;
1227
1228         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1229         sdata->control_port_no_encrypt = false;
1230
1231         sdata->noack_map = 0;
1232
1233         /* only monitor/p2p-device differ */
1234         if (sdata->dev) {
1235                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1236                 sdata->dev->type = ARPHRD_ETHER;
1237         }
1238
1239         skb_queue_head_init(&sdata->skb_queue);
1240         INIT_WORK(&sdata->work, ieee80211_iface_work);
1241         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1242
1243         switch (type) {
1244         case NL80211_IFTYPE_P2P_GO:
1245                 type = NL80211_IFTYPE_AP;
1246                 sdata->vif.type = type;
1247                 sdata->vif.p2p = true;
1248                 /* fall through */
1249         case NL80211_IFTYPE_AP:
1250                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1251                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1252                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1253                 break;
1254         case NL80211_IFTYPE_P2P_CLIENT:
1255                 type = NL80211_IFTYPE_STATION;
1256                 sdata->vif.type = type;
1257                 sdata->vif.p2p = true;
1258                 /* fall through */
1259         case NL80211_IFTYPE_STATION:
1260                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1261                 ieee80211_sta_setup_sdata(sdata);
1262                 break;
1263         case NL80211_IFTYPE_ADHOC:
1264                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1265                 ieee80211_ibss_setup_sdata(sdata);
1266                 break;
1267         case NL80211_IFTYPE_MESH_POINT:
1268                 if (ieee80211_vif_is_mesh(&sdata->vif))
1269                         ieee80211_mesh_init_sdata(sdata);
1270                 break;
1271         case NL80211_IFTYPE_MONITOR:
1272                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1273                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1274                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1275                                       MONITOR_FLAG_OTHER_BSS;
1276                 break;
1277         case NL80211_IFTYPE_WDS:
1278                 sdata->vif.bss_conf.bssid = NULL;
1279                 break;
1280         case NL80211_IFTYPE_AP_VLAN:
1281                 break;
1282         case NL80211_IFTYPE_P2P_DEVICE:
1283                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1284                 break;
1285         case NL80211_IFTYPE_UNSPECIFIED:
1286         case NUM_NL80211_IFTYPES:
1287                 BUG();
1288                 break;
1289         }
1290
1291         ieee80211_debugfs_add_netdev(sdata);
1292 }
1293
1294 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1295                                            enum nl80211_iftype type)
1296 {
1297         struct ieee80211_local *local = sdata->local;
1298         int ret, err;
1299         enum nl80211_iftype internal_type = type;
1300         bool p2p = false;
1301
1302         ASSERT_RTNL();
1303
1304         if (!local->ops->change_interface)
1305                 return -EBUSY;
1306
1307         switch (sdata->vif.type) {
1308         case NL80211_IFTYPE_AP:
1309         case NL80211_IFTYPE_STATION:
1310         case NL80211_IFTYPE_ADHOC:
1311                 /*
1312                  * Could maybe also all others here?
1313                  * Just not sure how that interacts
1314                  * with the RX/config path e.g. for
1315                  * mesh.
1316                  */
1317                 break;
1318         default:
1319                 return -EBUSY;
1320         }
1321
1322         switch (type) {
1323         case NL80211_IFTYPE_AP:
1324         case NL80211_IFTYPE_STATION:
1325         case NL80211_IFTYPE_ADHOC:
1326                 /*
1327                  * Could probably support everything
1328                  * but WDS here (WDS do_open can fail
1329                  * under memory pressure, which this
1330                  * code isn't prepared to handle).
1331                  */
1332                 break;
1333         case NL80211_IFTYPE_P2P_CLIENT:
1334                 p2p = true;
1335                 internal_type = NL80211_IFTYPE_STATION;
1336                 break;
1337         case NL80211_IFTYPE_P2P_GO:
1338                 p2p = true;
1339                 internal_type = NL80211_IFTYPE_AP;
1340                 break;
1341         default:
1342                 return -EBUSY;
1343         }
1344
1345         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1346         if (ret)
1347                 return ret;
1348
1349         ieee80211_do_stop(sdata, false);
1350
1351         ieee80211_teardown_sdata(sdata);
1352
1353         ret = drv_change_interface(local, sdata, internal_type, p2p);
1354         if (ret)
1355                 type = sdata->vif.type;
1356
1357         /*
1358          * Ignore return value here, there's not much we can do since
1359          * the driver changed the interface type internally already.
1360          * The warnings will hopefully make driver authors fix it :-)
1361          */
1362         ieee80211_check_queues(sdata);
1363
1364         ieee80211_setup_sdata(sdata, type);
1365
1366         err = ieee80211_do_open(&sdata->wdev, false);
1367         WARN(err, "type change: do_open returned %d", err);
1368
1369         return ret;
1370 }
1371
1372 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1373                              enum nl80211_iftype type)
1374 {
1375         int ret;
1376
1377         ASSERT_RTNL();
1378
1379         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1380                 return 0;
1381
1382         if (ieee80211_sdata_running(sdata)) {
1383                 ret = ieee80211_runtime_change_iftype(sdata, type);
1384                 if (ret)
1385                         return ret;
1386         } else {
1387                 /* Purge and reset type-dependent state. */
1388                 ieee80211_teardown_sdata(sdata);
1389                 ieee80211_setup_sdata(sdata, type);
1390         }
1391
1392         /* reset some values that shouldn't be kept across type changes */
1393         sdata->drop_unencrypted = 0;
1394         if (type == NL80211_IFTYPE_STATION)
1395                 sdata->u.mgd.use_4addr = false;
1396
1397         return 0;
1398 }
1399
1400 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1401                                        u8 *perm_addr, enum nl80211_iftype type)
1402 {
1403         struct ieee80211_sub_if_data *sdata;
1404         u64 mask, start, addr, val, inc;
1405         u8 *m;
1406         u8 tmp_addr[ETH_ALEN];
1407         int i;
1408
1409         /* default ... something at least */
1410         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1411
1412         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1413             local->hw.wiphy->n_addresses <= 1)
1414                 return;
1415
1416         mutex_lock(&local->iflist_mtx);
1417
1418         switch (type) {
1419         case NL80211_IFTYPE_MONITOR:
1420                 /* doesn't matter */
1421                 break;
1422         case NL80211_IFTYPE_WDS:
1423         case NL80211_IFTYPE_AP_VLAN:
1424                 /* match up with an AP interface */
1425                 list_for_each_entry(sdata, &local->interfaces, list) {
1426                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1427                                 continue;
1428                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1429                         break;
1430                 }
1431                 /* keep default if no AP interface present */
1432                 break;
1433         case NL80211_IFTYPE_P2P_CLIENT:
1434         case NL80211_IFTYPE_P2P_GO:
1435                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1436                         list_for_each_entry(sdata, &local->interfaces, list) {
1437                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1438                                         continue;
1439                                 if (!ieee80211_sdata_running(sdata))
1440                                         continue;
1441                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1442                                 goto out_unlock;
1443                         }
1444                 }
1445                 /* otherwise fall through */
1446         default:
1447                 /* assign a new address if possible -- try n_addresses first */
1448                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1449                         bool used = false;
1450
1451                         list_for_each_entry(sdata, &local->interfaces, list) {
1452                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1453                                            sdata->vif.addr, ETH_ALEN) == 0) {
1454                                         used = true;
1455                                         break;
1456                                 }
1457                         }
1458
1459                         if (!used) {
1460                                 memcpy(perm_addr,
1461                                        local->hw.wiphy->addresses[i].addr,
1462                                        ETH_ALEN);
1463                                 break;
1464                         }
1465                 }
1466
1467                 /* try mask if available */
1468                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1469                         break;
1470
1471                 m = local->hw.wiphy->addr_mask;
1472                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1473                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1474                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1475
1476                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1477                         /* not a contiguous mask ... not handled now! */
1478                         pr_info("not contiguous\n");
1479                         break;
1480                 }
1481
1482                 m = local->hw.wiphy->perm_addr;
1483                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1484                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1485                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1486
1487                 inc = 1ULL<<__ffs64(mask);
1488                 val = (start & mask);
1489                 addr = (start & ~mask) | (val & mask);
1490                 do {
1491                         bool used = false;
1492
1493                         tmp_addr[5] = addr >> 0*8;
1494                         tmp_addr[4] = addr >> 1*8;
1495                         tmp_addr[3] = addr >> 2*8;
1496                         tmp_addr[2] = addr >> 3*8;
1497                         tmp_addr[1] = addr >> 4*8;
1498                         tmp_addr[0] = addr >> 5*8;
1499
1500                         val += inc;
1501
1502                         list_for_each_entry(sdata, &local->interfaces, list) {
1503                                 if (memcmp(tmp_addr, sdata->vif.addr,
1504                                                         ETH_ALEN) == 0) {
1505                                         used = true;
1506                                         break;
1507                                 }
1508                         }
1509
1510                         if (!used) {
1511                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1512                                 break;
1513                         }
1514                         addr = (start & ~mask) | (val & mask);
1515                 } while (addr != start);
1516
1517                 break;
1518         }
1519
1520  out_unlock:
1521         mutex_unlock(&local->iflist_mtx);
1522 }
1523
1524 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1525 {
1526         struct ieee80211_sub_if_data *sdata;
1527
1528         sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1529
1530         ieee80211_cleanup_sdata_stas(sdata);
1531 }
1532
1533 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1534                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1535                      struct vif_params *params)
1536 {
1537         struct net_device *ndev = NULL;
1538         struct ieee80211_sub_if_data *sdata = NULL;
1539         int ret, i;
1540         int txqs = 1;
1541
1542         ASSERT_RTNL();
1543
1544         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1545                 struct wireless_dev *wdev;
1546
1547                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1548                                 GFP_KERNEL);
1549                 if (!sdata)
1550                         return -ENOMEM;
1551                 wdev = &sdata->wdev;
1552
1553                 sdata->dev = NULL;
1554                 strlcpy(sdata->name, name, IFNAMSIZ);
1555                 ieee80211_assign_perm_addr(local, wdev->address, type);
1556                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1557         } else {
1558                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1559                         txqs = IEEE80211_NUM_ACS;
1560
1561                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1562                                         local->hw.vif_data_size,
1563                                         name, ieee80211_if_setup, txqs, 1);
1564                 if (!ndev)
1565                         return -ENOMEM;
1566                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1567
1568                 ndev->needed_headroom = local->tx_headroom +
1569                                         4*6 /* four MAC addresses */
1570                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1571                                         + 6 /* mesh */
1572                                         + 8 /* rfc1042/bridge tunnel */
1573                                         - ETH_HLEN /* ethernet hard_header_len */
1574                                         + IEEE80211_ENCRYPT_HEADROOM;
1575                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1576
1577                 ret = dev_alloc_name(ndev, ndev->name);
1578                 if (ret < 0) {
1579                         free_netdev(ndev);
1580                         return ret;
1581                 }
1582
1583                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1584                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1585                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1586
1587                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1588                 sdata = netdev_priv(ndev);
1589                 ndev->ieee80211_ptr = &sdata->wdev;
1590                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1591                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1592
1593                 sdata->dev = ndev;
1594         }
1595
1596         /* initialise type-independent data */
1597         sdata->wdev.wiphy = local->hw.wiphy;
1598         sdata->local = local;
1599
1600         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1601                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1602
1603         INIT_LIST_HEAD(&sdata->key_list);
1604
1605         spin_lock_init(&sdata->cleanup_stations_lock);
1606         INIT_LIST_HEAD(&sdata->cleanup_stations);
1607         INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1608         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1609                           ieee80211_dfs_cac_timer_work);
1610         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1611                           ieee80211_delayed_tailroom_dec);
1612
1613         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1614                 struct ieee80211_supported_band *sband;
1615                 sband = local->hw.wiphy->bands[i];
1616                 sdata->rc_rateidx_mask[i] =
1617                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1618                 if (sband)
1619                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1620                                sband->ht_cap.mcs.rx_mask,
1621                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1622                 else
1623                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1624                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1625         }
1626
1627         ieee80211_set_default_queues(sdata);
1628
1629         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1630         sdata->user_power_level = local->user_power_level;
1631
1632         /* setup type-dependent data */
1633         ieee80211_setup_sdata(sdata, type);
1634
1635         if (ndev) {
1636                 if (params) {
1637                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1638                         if (type == NL80211_IFTYPE_STATION)
1639                                 sdata->u.mgd.use_4addr = params->use_4addr;
1640                 }
1641
1642                 ndev->features |= local->hw.netdev_features;
1643
1644                 ret = register_netdevice(ndev);
1645                 if (ret) {
1646                         free_netdev(ndev);
1647                         return ret;
1648                 }
1649         }
1650
1651         mutex_lock(&local->iflist_mtx);
1652         list_add_tail_rcu(&sdata->list, &local->interfaces);
1653         mutex_unlock(&local->iflist_mtx);
1654
1655         if (new_wdev)
1656                 *new_wdev = &sdata->wdev;
1657
1658         return 0;
1659 }
1660
1661 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1662 {
1663         ASSERT_RTNL();
1664
1665         mutex_lock(&sdata->local->iflist_mtx);
1666         list_del_rcu(&sdata->list);
1667         mutex_unlock(&sdata->local->iflist_mtx);
1668
1669         synchronize_rcu();
1670
1671         if (sdata->dev) {
1672                 unregister_netdevice(sdata->dev);
1673         } else {
1674                 cfg80211_unregister_wdev(&sdata->wdev);
1675                 kfree(sdata);
1676         }
1677 }
1678
1679 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1680 {
1681         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1682                 return;
1683         ieee80211_do_stop(sdata, true);
1684         ieee80211_teardown_sdata(sdata);
1685 }
1686
1687 /*
1688  * Remove all interfaces, may only be called at hardware unregistration
1689  * time because it doesn't do RCU-safe list removals.
1690  */
1691 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1692 {
1693         struct ieee80211_sub_if_data *sdata, *tmp;
1694         LIST_HEAD(unreg_list);
1695         LIST_HEAD(wdev_list);
1696
1697         ASSERT_RTNL();
1698
1699         mutex_lock(&local->iflist_mtx);
1700         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1701                 list_del(&sdata->list);
1702
1703                 if (sdata->dev)
1704                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1705                 else
1706                         list_add(&sdata->list, &wdev_list);
1707         }
1708         mutex_unlock(&local->iflist_mtx);
1709         unregister_netdevice_many(&unreg_list);
1710         list_del(&unreg_list);
1711
1712         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1713                 list_del(&sdata->list);
1714                 cfg80211_unregister_wdev(&sdata->wdev);
1715                 kfree(sdata);
1716         }
1717 }
1718
1719 static int netdev_notify(struct notifier_block *nb,
1720                          unsigned long state,
1721                          void *ndev)
1722 {
1723         struct net_device *dev = ndev;
1724         struct ieee80211_sub_if_data *sdata;
1725
1726         if (state != NETDEV_CHANGENAME)
1727                 return 0;
1728
1729         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1730                 return 0;
1731
1732         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1733                 return 0;
1734
1735         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1736
1737         memcpy(sdata->name, dev->name, IFNAMSIZ);
1738
1739         ieee80211_debugfs_rename_netdev(sdata);
1740         return 0;
1741 }
1742
1743 static struct notifier_block mac80211_netdev_notifier = {
1744         .notifier_call = netdev_notify,
1745 };
1746
1747 int ieee80211_iface_init(void)
1748 {
1749         return register_netdevice_notifier(&mac80211_netdev_notifier);
1750 }
1751
1752 void ieee80211_iface_exit(void)
1753 {
1754         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1755 }