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->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 static 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 static 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                         netif_carrier_on(dev);
 599                 }
 600
 601                 /*
 602                  * set default queue parameters so drivers don't
 603                  * need to initialise the hardware if the hardware
 604                  * doesn't start up with sane defaults
 605                  */
 606                 ieee80211_set_wmm_default(sdata, true);
 607         }
 608
 609         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 610
 611         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 612                 /* Create STA entry for the WDS peer */
 613                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 614                                      GFP_KERNEL);
 615                 if (!sta) {
 616                         res = -ENOMEM;
 617                         goto err_del_interface;
 618                 }
 619
 620                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 621                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 622                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 623
 624                 res = sta_info_insert(sta);
 625                 if (res) {
 626                         /* STA has been freed */
 627                         goto err_del_interface;
 628                 }
 629
 630                 rate_control_rate_init(sta);
 631                 netif_carrier_on(dev);
 632         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 633                 rcu_assign_pointer(local->p2p_sdata, sdata);
 634         }
 635
 636         /*
 637          * set_multicast_list will be invoked by the networking core
 638          * which will check whether any increments here were done in
 639          * error and sync them down to the hardware as filter flags.
 640          */
 641         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 642                 atomic_inc(&local->iff_allmultis);
 643
 644         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 645                 atomic_inc(&local->iff_promiscs);
 646
 647         if (coming_up)
 648                 local->open_count++;
 649
 650         if (hw_reconf_flags)
 651                 ieee80211_hw_config(local, hw_reconf_flags);
 652
 653         ieee80211_recalc_ps(local, -1);
 654
 655         if (dev)
 656                 netif_tx_start_all_queues(dev);
 657
 658         return 0;
 659  err_del_interface:
 660         drv_remove_interface(local, sdata);
 661  err_stop:
 662         if (!local->open_count)
 663                 drv_stop(local);
 664  err_del_bss:
 665         sdata->bss = NULL;
 666         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 667                 list_del(&sdata->u.vlan.list);
 668         /* might already be clear but that doesn't matter */
 669         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 670         return res;
 671 }
 672
 673 static int ieee80211_open(struct net_device *dev)
 674 {
 675         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 676         int err;
 677
 678         /* fail early if user set an invalid address */
 679         if (!is_valid_ether_addr(dev->dev_addr))
 680                 return -EADDRNOTAVAIL;
 681
 682         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 683         if (err)
 684                 return err;
 685
 686         return ieee80211_do_open(&sdata->wdev, true);
 687 }
 688
 689 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 690                               bool going_down)
 691 {
 692         struct ieee80211_local *local = sdata->local;
 693         unsigned long flags;
 694         struct sk_buff *skb, *tmp;
 695         u32 hw_reconf_flags = 0;
 696         int i, flushed;
 697         struct ps_data *ps;
 698
 699         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 700
 701         if (rcu_access_pointer(local->scan_sdata) == sdata)
 702                 ieee80211_scan_cancel(local);
 703
 704         /*
 705          * Stop TX on this interface first.
 706          */
 707         if (sdata->dev)
 708                 netif_tx_stop_all_queues(sdata->dev);
 709
 710         ieee80211_roc_purge(sdata);
 711
 712         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 713                 ieee80211_mgd_stop(sdata);
 714
 715         /*
 716          * Remove all stations associated with this interface.
 717          *
 718          * This must be done before calling ops->remove_interface()
 719          * because otherwise we can later invoke ops->sta_notify()
 720          * whenever the STAs are removed, and that invalidates driver
 721          * assumptions about always getting a vif pointer that is valid
 722          * (because if we remove a STA after ops->remove_interface()
 723          * the driver will have removed the vif info already!)
 724          *
 725          * This is relevant only in WDS mode, in all other modes we've
 726          * already removed all stations when disconnecting or similar,
 727          * so warn otherwise.
 728          *
 729          * We call sta_info_flush_cleanup() later, to combine RCU waits.
 730          */
 731         flushed = sta_info_flush_defer(sdata);
 732         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 733                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
 734
 735         /*
 736          * Don't count this interface for promisc/allmulti while it
 737          * is down. dev_mc_unsync() will invoke set_multicast_list
 738          * on the master interface which will sync these down to the
 739          * hardware as filter flags.
 740          */
 741         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 742                 atomic_dec(&local->iff_allmultis);
 743
 744         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 745                 atomic_dec(&local->iff_promiscs);
 746
 747         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 748                 local->fif_pspoll--;
 749                 local->fif_probe_req--;
 750         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 751                 local->fif_probe_req--;
 752         }
 753
 754         if (sdata->dev) {
 755                 netif_addr_lock_bh(sdata->dev);
 756                 spin_lock_bh(&local->filter_lock);
 757                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 758                                  sdata->dev->addr_len);
 759                 spin_unlock_bh(&local->filter_lock);
 760                 netif_addr_unlock_bh(sdata->dev);
 761
 762                 ieee80211_configure_filter(local);
 763         }
 764
 765         del_timer_sync(&local->dynamic_ps_timer);
 766         cancel_work_sync(&local->dynamic_ps_enable_work);
 767
 768         cancel_work_sync(&sdata->recalc_smps);
 769
 770         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 771
 772         if (sdata->wdev.cac_started) {
 773                 mutex_lock(&local->iflist_mtx);
 774                 ieee80211_vif_release_channel(sdata);
 775                 mutex_unlock(&local->iflist_mtx);
 776                 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
 777                                    GFP_KERNEL);
 778         }
 779
 780         /* APs need special treatment */
 781         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 782                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 783
 784                 /* down all dependent devices, that is VLANs */
 785                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 786                                          u.vlan.list)
 787                         dev_close(vlan->dev);
 788                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 789         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 790                 /* remove all packets in parent bc_buf pointing to this dev */
 791                 ps = &sdata->bss->ps;
 792
 793                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 794                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 795                         if (skb->dev == sdata->dev) {
 796                                 __skb_unlink(skb, &ps->bc_buf);
 797                                 local->total_ps_buffered--;
 798                                 ieee80211_free_txskb(&local->hw, skb);
 799                         }
 800                 }
 801                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 802         }
 803
 804         if (going_down)
 805                 local->open_count--;
 806
 807         switch (sdata->vif.type) {
 808         case NL80211_IFTYPE_AP_VLAN:
 809                 list_del(&sdata->u.vlan.list);
 810                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
 811                 /* no need to tell driver */
 812                 break;
 813         case NL80211_IFTYPE_MONITOR:
 814                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 815                         local->cooked_mntrs--;
 816                         break;
 817                 }
 818
 819                 local->monitors--;
 820                 if (local->monitors == 0) {
 821                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 822                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 823                         ieee80211_del_virtual_monitor(local);
 824                 }
 825
 826                 ieee80211_adjust_monitor_flags(sdata, -1);
 827                 ieee80211_configure_filter(local);
 828                 mutex_lock(&local->mtx);
 829                 ieee80211_recalc_idle(local);
 830                 mutex_unlock(&local->mtx);
 831                 break;
 832         case NL80211_IFTYPE_P2P_DEVICE:
 833                 /* relies on synchronize_rcu() below */
 834                 rcu_assign_pointer(local->p2p_sdata, NULL);
 835                 /* fall through */
 836         default:
 837                 cancel_work_sync(&sdata->work);
 838                 /*
 839                  * When we get here, the interface is marked down.
 840                  *
 841                  * sta_info_flush_cleanup() requires rcu_barrier()
 842                  * first to wait for the station call_rcu() calls
 843                  * to complete, here we need at least sychronize_rcu()
 844                  * it to wait for the RX path in case it is using the
 845                  * interface and enqueuing frames at this very time on
 846                  * another CPU.
 847                  */
 848                 rcu_barrier();
 849                 sta_info_flush_cleanup(sdata);
 850
 851                 /*
 852                  * Free all remaining keys, there shouldn't be any,
 853                  * except maybe in WDS mode?
 854                  */
 855                 ieee80211_free_keys(sdata);
 856
 857                 /* fall through */
 858         case NL80211_IFTYPE_AP:
 859                 skb_queue_purge(&sdata->skb_queue);
 860
 861                 if (going_down)
 862                         drv_remove_interface(local, sdata);
 863         }
 864
 865         sdata->bss = NULL;
 866
 867         ieee80211_recalc_ps(local, -1);
 868
 869         if (local->open_count == 0) {
 870                 ieee80211_clear_tx_pending(local);
 871                 ieee80211_stop_device(local);
 872
 873                 /* no reconfiguring after stop! */
 874                 hw_reconf_flags = 0;
 875         }
 876
 877         /* do after stop to avoid reconfiguring when we stop anyway */
 878         if (hw_reconf_flags)
 879                 ieee80211_hw_config(local, hw_reconf_flags);
 880
 881         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 882         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 883                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 884                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 885                         if (info->control.vif == &sdata->vif) {
 886                                 __skb_unlink(skb, &local->pending[i]);
 887                                 ieee80211_free_txskb(&local->hw, skb);
 888                         }
 889                 }
 890         }
 891         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 892
 893         if (local->monitors == local->open_count && local->monitors > 0)
 894                 ieee80211_add_virtual_monitor(local);
 895 }
 896
 897 static int ieee80211_stop(struct net_device *dev)
 898 {
 899         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 900
 901         ieee80211_do_stop(sdata, true);
 902
 903         return 0;
 904 }
 905
 906 static void ieee80211_set_multicast_list(struct net_device *dev)
 907 {
 908         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 909         struct ieee80211_local *local = sdata->local;
 910         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 911
 912         allmulti = !!(dev->flags & IFF_ALLMULTI);
 913         promisc = !!(dev->flags & IFF_PROMISC);
 914         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 915         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 916
 917         if (allmulti != sdata_allmulti) {
 918                 if (dev->flags & IFF_ALLMULTI)
 919                         atomic_inc(&local->iff_allmultis);
 920                 else
 921                         atomic_dec(&local->iff_allmultis);
 922                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 923         }
 924
 925         if (promisc != sdata_promisc) {
 926                 if (dev->flags & IFF_PROMISC)
 927                         atomic_inc(&local->iff_promiscs);
 928                 else
 929                         atomic_dec(&local->iff_promiscs);
 930                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 931         }
 932
 933         /*
 934          * TODO: If somebody needs this on AP interfaces,
 935          *       it can be enabled easily but multicast
 936          *       addresses from VLANs need to be synced.
 937          */
 938         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 939             sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
 940             sdata->vif.type != NL80211_IFTYPE_AP)
 941                 drv_set_multicast_list(local, sdata, &dev->mc);
 942
 943         spin_lock_bh(&local->filter_lock);
 944         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 945         spin_unlock_bh(&local->filter_lock);
 946         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 947 }
 948
 949 /*
 950  * Called when the netdev is removed or, by the code below, before
 951  * the interface type changes.
 952  */
 953 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 954 {
 955         int flushed;
 956         int i;
 957
 958         /* free extra data */
 959         ieee80211_free_keys(sdata);
 960
 961         ieee80211_debugfs_remove_netdev(sdata);
 962
 963         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 964                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 965         sdata->fragment_next = 0;
 966
 967         if (ieee80211_vif_is_mesh(&sdata->vif))
 968                 mesh_rmc_free(sdata);
 969
 970         flushed = sta_info_flush(sdata);
 971         WARN_ON(flushed);
 972 }
 973
 974 static void ieee80211_uninit(struct net_device *dev)
 975 {
 976         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
 977 }
 978
 979 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 980                                          struct sk_buff *skb)
 981 {
 982         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 983 }
 984
 985 static const struct net_device_ops ieee80211_dataif_ops = {
 986         .ndo_open               = ieee80211_open,
 987         .ndo_stop               = ieee80211_stop,
 988         .ndo_uninit             = ieee80211_uninit,
 989         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 990         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 991         .ndo_change_mtu         = ieee80211_change_mtu,
 992         .ndo_set_mac_address    = ieee80211_change_mac,
 993         .ndo_select_queue       = ieee80211_netdev_select_queue,
 994 };
 995
 996 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 997                                           struct sk_buff *skb)
 998 {
 999         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1000         struct ieee80211_local *local = sdata->local;
1001         struct ieee80211_hdr *hdr;
1002         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1003
1004         if (local->hw.queues < IEEE80211_NUM_ACS)
1005                 return 0;
1006
1007         if (skb->len < 4 ||
1008             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1009                 return 0; /* doesn't matter, frame will be dropped */
1010
1011         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1012
1013         return ieee80211_select_queue_80211(sdata, skb, hdr);
1014 }
1015
1016 static const struct net_device_ops ieee80211_monitorif_ops = {
1017         .ndo_open               = ieee80211_open,
1018         .ndo_stop               = ieee80211_stop,
1019         .ndo_uninit             = ieee80211_uninit,
1020         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1021         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1022         .ndo_change_mtu         = ieee80211_change_mtu,
1023         .ndo_set_mac_address    = eth_mac_addr,
1024         .ndo_select_queue       = ieee80211_monitor_select_queue,
1025 };
1026
1027 static void ieee80211_if_setup(struct net_device *dev)
1028 {
1029         ether_setup(dev);
1030         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1031         dev->netdev_ops = &ieee80211_dataif_ops;
1032         dev->destructor = free_netdev;
1033 }
1034
1035 static void ieee80211_iface_work(struct work_struct *work)
1036 {
1037         struct ieee80211_sub_if_data *sdata =
1038                 container_of(work, struct ieee80211_sub_if_data, work);
1039         struct ieee80211_local *local = sdata->local;
1040         struct sk_buff *skb;
1041         struct sta_info *sta;
1042         struct ieee80211_ra_tid *ra_tid;
1043
1044         if (!ieee80211_sdata_running(sdata))
1045                 return;
1046
1047         if (local->scanning)
1048                 return;
1049
1050         /*
1051          * ieee80211_queue_work() should have picked up most cases,
1052          * here we'll pick the rest.
1053          */
1054         if (WARN(local->suspended,
1055                  "interface work scheduled while going to suspend\n"))
1056                 return;
1057
1058         /* first process frames */
1059         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1060                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1061
1062                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1063                         ra_tid = (void *)&skb->cb;
1064                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1065                                                  ra_tid->tid);
1066                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1067                         ra_tid = (void *)&skb->cb;
1068                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1069                                                 ra_tid->tid);
1070                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1071                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1072                         int len = skb->len;
1073
1074                         mutex_lock(&local->sta_mtx);
1075                         sta = sta_info_get_bss(sdata, mgmt->sa);
1076                         if (sta) {
1077                                 switch (mgmt->u.action.u.addba_req.action_code) {
1078                                 case WLAN_ACTION_ADDBA_REQ:
1079                                         ieee80211_process_addba_request(
1080                                                         local, sta, mgmt, len);
1081                                         break;
1082                                 case WLAN_ACTION_ADDBA_RESP:
1083                                         ieee80211_process_addba_resp(local, sta,
1084                                                                      mgmt, len);
1085                                         break;
1086                                 case WLAN_ACTION_DELBA:
1087                                         ieee80211_process_delba(sdata, sta,
1088                                                                 mgmt, len);
1089                                         break;
1090                                 default:
1091                                         WARN_ON(1);
1092                                         break;
1093                                 }
1094                         }
1095                         mutex_unlock(&local->sta_mtx);
1096                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1097                         struct ieee80211_hdr *hdr = (void *)mgmt;
1098                         /*
1099                          * So the frame isn't mgmt, but frame_control
1100                          * is at the right place anyway, of course, so
1101                          * the if statement is correct.
1102                          *
1103                          * Warn if we have other data frame types here,
1104                          * they must not get here.
1105                          */
1106                         WARN_ON(hdr->frame_control &
1107                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1108                         WARN_ON(!(hdr->seq_ctrl &
1109                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1110                         /*
1111                          * This was a fragment of a frame, received while
1112                          * a block-ack session was active. That cannot be
1113                          * right, so terminate the session.
1114                          */
1115                         mutex_lock(&local->sta_mtx);
1116                         sta = sta_info_get_bss(sdata, mgmt->sa);
1117                         if (sta) {
1118                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1119                                                 IEEE80211_QOS_CTL_TID_MASK;
1120
1121                                 __ieee80211_stop_rx_ba_session(
1122                                         sta, tid, WLAN_BACK_RECIPIENT,
1123                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1124                                         true);
1125                         }
1126                         mutex_unlock(&local->sta_mtx);
1127                 } else switch (sdata->vif.type) {
1128                 case NL80211_IFTYPE_STATION:
1129                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1130                         break;
1131                 case NL80211_IFTYPE_ADHOC:
1132                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1133                         break;
1134                 case NL80211_IFTYPE_MESH_POINT:
1135                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1136                                 break;
1137                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1138                         break;
1139                 default:
1140                         WARN(1, "frame for unexpected interface type");
1141                         break;
1142                 }
1143
1144                 kfree_skb(skb);
1145         }
1146
1147         /* then other type-dependent work */
1148         switch (sdata->vif.type) {
1149         case NL80211_IFTYPE_STATION:
1150                 ieee80211_sta_work(sdata);
1151                 break;
1152         case NL80211_IFTYPE_ADHOC:
1153                 ieee80211_ibss_work(sdata);
1154                 break;
1155         case NL80211_IFTYPE_MESH_POINT:
1156                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1157                         break;
1158                 ieee80211_mesh_work(sdata);
1159                 break;
1160         default:
1161                 break;
1162         }
1163 }
1164
1165 static void ieee80211_recalc_smps_work(struct work_struct *work)
1166 {
1167         struct ieee80211_sub_if_data *sdata =
1168                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1169
1170         ieee80211_recalc_smps(sdata);
1171 }
1172
1173 /*
1174  * Helper function to initialise an interface to a specific type.
1175  */
1176 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1177                                   enum nl80211_iftype type)
1178 {
1179         /* clear type-dependent union */
1180         memset(&sdata->u, 0, sizeof(sdata->u));
1181
1182         /* and set some type-dependent values */
1183         sdata->vif.type = type;
1184         sdata->vif.p2p = false;
1185         sdata->wdev.iftype = type;
1186
1187         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1188         sdata->control_port_no_encrypt = false;
1189
1190         sdata->noack_map = 0;
1191
1192         /* only monitor/p2p-device differ */
1193         if (sdata->dev) {
1194                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1195                 sdata->dev->type = ARPHRD_ETHER;
1196         }
1197
1198         skb_queue_head_init(&sdata->skb_queue);
1199         INIT_WORK(&sdata->work, ieee80211_iface_work);
1200         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1201
1202         switch (type) {
1203         case NL80211_IFTYPE_P2P_GO:
1204                 type = NL80211_IFTYPE_AP;
1205                 sdata->vif.type = type;
1206                 sdata->vif.p2p = true;
1207                 /* fall through */
1208         case NL80211_IFTYPE_AP:
1209                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1210                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1211                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1212                 break;
1213         case NL80211_IFTYPE_P2P_CLIENT:
1214                 type = NL80211_IFTYPE_STATION;
1215                 sdata->vif.type = type;
1216                 sdata->vif.p2p = true;
1217                 /* fall through */
1218         case NL80211_IFTYPE_STATION:
1219                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1220                 ieee80211_sta_setup_sdata(sdata);
1221                 break;
1222         case NL80211_IFTYPE_ADHOC:
1223                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1224                 ieee80211_ibss_setup_sdata(sdata);
1225                 break;
1226         case NL80211_IFTYPE_MESH_POINT:
1227                 if (ieee80211_vif_is_mesh(&sdata->vif))
1228                         ieee80211_mesh_init_sdata(sdata);
1229                 break;
1230         case NL80211_IFTYPE_MONITOR:
1231                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1232                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1233                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1234                                       MONITOR_FLAG_OTHER_BSS;
1235                 break;
1236         case NL80211_IFTYPE_WDS:
1237                 sdata->vif.bss_conf.bssid = NULL;
1238                 break;
1239         case NL80211_IFTYPE_AP_VLAN:
1240                 break;
1241         case NL80211_IFTYPE_P2P_DEVICE:
1242                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1243                 break;
1244         case NL80211_IFTYPE_UNSPECIFIED:
1245         case NUM_NL80211_IFTYPES:
1246                 BUG();
1247                 break;
1248         }
1249
1250         ieee80211_debugfs_add_netdev(sdata);
1251 }
1252
1253 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1254                                            enum nl80211_iftype type)
1255 {
1256         struct ieee80211_local *local = sdata->local;
1257         int ret, err;
1258         enum nl80211_iftype internal_type = type;
1259         bool p2p = false;
1260
1261         ASSERT_RTNL();
1262
1263         if (!local->ops->change_interface)
1264                 return -EBUSY;
1265
1266         switch (sdata->vif.type) {
1267         case NL80211_IFTYPE_AP:
1268         case NL80211_IFTYPE_STATION:
1269         case NL80211_IFTYPE_ADHOC:
1270                 /*
1271                  * Could maybe also all others here?
1272                  * Just not sure how that interacts
1273                  * with the RX/config path e.g. for
1274                  * mesh.
1275                  */
1276                 break;
1277         default:
1278                 return -EBUSY;
1279         }
1280
1281         switch (type) {
1282         case NL80211_IFTYPE_AP:
1283         case NL80211_IFTYPE_STATION:
1284         case NL80211_IFTYPE_ADHOC:
1285                 /*
1286                  * Could probably support everything
1287                  * but WDS here (WDS do_open can fail
1288                  * under memory pressure, which this
1289                  * code isn't prepared to handle).
1290                  */
1291                 break;
1292         case NL80211_IFTYPE_P2P_CLIENT:
1293                 p2p = true;
1294                 internal_type = NL80211_IFTYPE_STATION;
1295                 break;
1296         case NL80211_IFTYPE_P2P_GO:
1297                 p2p = true;
1298                 internal_type = NL80211_IFTYPE_AP;
1299                 break;
1300         default:
1301                 return -EBUSY;
1302         }
1303
1304         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1305         if (ret)
1306                 return ret;
1307
1308         ieee80211_do_stop(sdata, false);
1309
1310         ieee80211_teardown_sdata(sdata);
1311
1312         ret = drv_change_interface(local, sdata, internal_type, p2p);
1313         if (ret)
1314                 type = sdata->vif.type;
1315
1316         /*
1317          * Ignore return value here, there's not much we can do since
1318          * the driver changed the interface type internally already.
1319          * The warnings will hopefully make driver authors fix it :-)
1320          */
1321         ieee80211_check_queues(sdata);
1322
1323         ieee80211_setup_sdata(sdata, type);
1324
1325         err = ieee80211_do_open(&sdata->wdev, false);
1326         WARN(err, "type change: do_open returned %d", err);
1327
1328         return ret;
1329 }
1330
1331 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1332                              enum nl80211_iftype type)
1333 {
1334         int ret;
1335
1336         ASSERT_RTNL();
1337
1338         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1339                 return 0;
1340
1341         if (ieee80211_sdata_running(sdata)) {
1342                 ret = ieee80211_runtime_change_iftype(sdata, type);
1343                 if (ret)
1344                         return ret;
1345         } else {
1346                 /* Purge and reset type-dependent state. */
1347                 ieee80211_teardown_sdata(sdata);
1348                 ieee80211_setup_sdata(sdata, type);
1349         }
1350
1351         /* reset some values that shouldn't be kept across type changes */
1352         sdata->drop_unencrypted = 0;
1353         if (type == NL80211_IFTYPE_STATION)
1354                 sdata->u.mgd.use_4addr = false;
1355
1356         return 0;
1357 }
1358
1359 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1360                                        u8 *perm_addr, enum nl80211_iftype type)
1361 {
1362         struct ieee80211_sub_if_data *sdata;
1363         u64 mask, start, addr, val, inc;
1364         u8 *m;
1365         u8 tmp_addr[ETH_ALEN];
1366         int i;
1367
1368         /* default ... something at least */
1369         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1370
1371         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1372             local->hw.wiphy->n_addresses <= 1)
1373                 return;
1374
1375         mutex_lock(&local->iflist_mtx);
1376
1377         switch (type) {
1378         case NL80211_IFTYPE_MONITOR:
1379                 /* doesn't matter */
1380                 break;
1381         case NL80211_IFTYPE_WDS:
1382         case NL80211_IFTYPE_AP_VLAN:
1383                 /* match up with an AP interface */
1384                 list_for_each_entry(sdata, &local->interfaces, list) {
1385                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1386                                 continue;
1387                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1388                         break;
1389                 }
1390                 /* keep default if no AP interface present */
1391                 break;
1392         case NL80211_IFTYPE_P2P_CLIENT:
1393         case NL80211_IFTYPE_P2P_GO:
1394                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1395                         list_for_each_entry(sdata, &local->interfaces, list) {
1396                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1397                                         continue;
1398                                 if (!ieee80211_sdata_running(sdata))
1399                                         continue;
1400                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1401                                 goto out_unlock;
1402                         }
1403                 }
1404                 /* otherwise fall through */
1405         default:
1406                 /* assign a new address if possible -- try n_addresses first */
1407                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1408                         bool used = false;
1409
1410                         list_for_each_entry(sdata, &local->interfaces, list) {
1411                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1412                                            sdata->vif.addr, ETH_ALEN) == 0) {
1413                                         used = true;
1414                                         break;
1415                                 }
1416                         }
1417
1418                         if (!used) {
1419                                 memcpy(perm_addr,
1420                                        local->hw.wiphy->addresses[i].addr,
1421                                        ETH_ALEN);
1422                                 break;
1423                         }
1424                 }
1425
1426                 /* try mask if available */
1427                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1428                         break;
1429
1430                 m = local->hw.wiphy->addr_mask;
1431                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1432                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1433                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1434
1435                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1436                         /* not a contiguous mask ... not handled now! */
1437                         pr_info("not contiguous\n");
1438                         break;
1439                 }
1440
1441                 m = local->hw.wiphy->perm_addr;
1442                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1443                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1444                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1445
1446                 inc = 1ULL<<__ffs64(mask);
1447                 val = (start & mask);
1448                 addr = (start & ~mask) | (val & mask);
1449                 do {
1450                         bool used = false;
1451
1452                         tmp_addr[5] = addr >> 0*8;
1453                         tmp_addr[4] = addr >> 1*8;
1454                         tmp_addr[3] = addr >> 2*8;
1455                         tmp_addr[2] = addr >> 3*8;
1456                         tmp_addr[1] = addr >> 4*8;
1457                         tmp_addr[0] = addr >> 5*8;
1458
1459                         val += inc;
1460
1461                         list_for_each_entry(sdata, &local->interfaces, list) {
1462                                 if (memcmp(tmp_addr, sdata->vif.addr,
1463                                                         ETH_ALEN) == 0) {
1464                                         used = true;
1465                                         break;
1466                                 }
1467                         }
1468
1469                         if (!used) {
1470                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1471                                 break;
1472                         }
1473                         addr = (start & ~mask) | (val & mask);
1474                 } while (addr != start);
1475
1476                 break;
1477         }
1478
1479  out_unlock:
1480         mutex_unlock(&local->iflist_mtx);
1481 }
1482
1483 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1484 {
1485         struct ieee80211_sub_if_data *sdata;
1486
1487         sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1488
1489         ieee80211_cleanup_sdata_stas(sdata);
1490 }
1491
1492 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1493                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1494                      struct vif_params *params)
1495 {
1496         struct net_device *ndev = NULL;
1497         struct ieee80211_sub_if_data *sdata = NULL;
1498         int ret, i;
1499         int txqs = 1;
1500
1501         ASSERT_RTNL();
1502
1503         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1504                 struct wireless_dev *wdev;
1505
1506                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1507                                 GFP_KERNEL);
1508                 if (!sdata)
1509                         return -ENOMEM;
1510                 wdev = &sdata->wdev;
1511
1512                 sdata->dev = NULL;
1513                 strlcpy(sdata->name, name, IFNAMSIZ);
1514                 ieee80211_assign_perm_addr(local, wdev->address, type);
1515                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1516         } else {
1517                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1518                         txqs = IEEE80211_NUM_ACS;
1519
1520                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1521                                         local->hw.vif_data_size,
1522                                         name, ieee80211_if_setup, txqs, 1);
1523                 if (!ndev)
1524                         return -ENOMEM;
1525                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1526
1527                 ndev->needed_headroom = local->tx_headroom +
1528                                         4*6 /* four MAC addresses */
1529                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1530                                         + 6 /* mesh */
1531                                         + 8 /* rfc1042/bridge tunnel */
1532                                         - ETH_HLEN /* ethernet hard_header_len */
1533                                         + IEEE80211_ENCRYPT_HEADROOM;
1534                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1535
1536                 ret = dev_alloc_name(ndev, ndev->name);
1537                 if (ret < 0) {
1538                         free_netdev(ndev);
1539                         return ret;
1540                 }
1541
1542                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1543                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1544                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1545
1546                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1547                 sdata = netdev_priv(ndev);
1548                 ndev->ieee80211_ptr = &sdata->wdev;
1549                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1550                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1551
1552                 sdata->dev = ndev;
1553         }
1554
1555         /* initialise type-independent data */
1556         sdata->wdev.wiphy = local->hw.wiphy;
1557         sdata->local = local;
1558
1559         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1560                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1561
1562         INIT_LIST_HEAD(&sdata->key_list);
1563
1564         spin_lock_init(&sdata->cleanup_stations_lock);
1565         INIT_LIST_HEAD(&sdata->cleanup_stations);
1566         INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1567         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1568                           ieee80211_dfs_cac_timer_work);
1569         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1570                           ieee80211_delayed_tailroom_dec);
1571
1572         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1573                 struct ieee80211_supported_band *sband;
1574                 sband = local->hw.wiphy->bands[i];
1575                 sdata->rc_rateidx_mask[i] =
1576                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1577                 if (sband)
1578                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1579                                sband->ht_cap.mcs.rx_mask,
1580                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1581                 else
1582                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1583                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1584         }
1585
1586         ieee80211_set_default_queues(sdata);
1587
1588         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1589         sdata->user_power_level = local->user_power_level;
1590
1591         /* setup type-dependent data */
1592         ieee80211_setup_sdata(sdata, type);
1593
1594         if (ndev) {
1595                 if (params) {
1596                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1597                         if (type == NL80211_IFTYPE_STATION)
1598                                 sdata->u.mgd.use_4addr = params->use_4addr;
1599                 }
1600
1601                 ndev->features |= local->hw.netdev_features;
1602
1603                 ret = register_netdevice(ndev);
1604                 if (ret) {
1605                         free_netdev(ndev);
1606                         return ret;
1607                 }
1608         }
1609
1610         mutex_lock(&local->iflist_mtx);
1611         list_add_tail_rcu(&sdata->list, &local->interfaces);
1612         mutex_unlock(&local->iflist_mtx);
1613
1614         if (new_wdev)
1615                 *new_wdev = &sdata->wdev;
1616
1617         return 0;
1618 }
1619
1620 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1621 {
1622         ASSERT_RTNL();
1623
1624         mutex_lock(&sdata->local->iflist_mtx);
1625         list_del_rcu(&sdata->list);
1626         mutex_unlock(&sdata->local->iflist_mtx);
1627
1628         synchronize_rcu();
1629
1630         if (sdata->dev) {
1631                 unregister_netdevice(sdata->dev);
1632         } else {
1633                 cfg80211_unregister_wdev(&sdata->wdev);
1634                 kfree(sdata);
1635         }
1636 }
1637
1638 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1639 {
1640         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1641                 return;
1642         ieee80211_do_stop(sdata, true);
1643         ieee80211_teardown_sdata(sdata);
1644 }
1645
1646 /*
1647  * Remove all interfaces, may only be called at hardware unregistration
1648  * time because it doesn't do RCU-safe list removals.
1649  */
1650 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1651 {
1652         struct ieee80211_sub_if_data *sdata, *tmp;
1653         LIST_HEAD(unreg_list);
1654         LIST_HEAD(wdev_list);
1655
1656         ASSERT_RTNL();
1657
1658         mutex_lock(&local->iflist_mtx);
1659         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1660                 list_del(&sdata->list);
1661
1662                 if (sdata->dev)
1663                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1664                 else
1665                         list_add(&sdata->list, &wdev_list);
1666         }
1667         mutex_unlock(&local->iflist_mtx);
1668         unregister_netdevice_many(&unreg_list);
1669         list_del(&unreg_list);
1670
1671         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1672                 list_del(&sdata->list);
1673                 cfg80211_unregister_wdev(&sdata->wdev);
1674                 kfree(sdata);
1675         }
1676 }
1677
1678 static int netdev_notify(struct notifier_block *nb,
1679                          unsigned long state,
1680                          void *ndev)
1681 {
1682         struct net_device *dev = ndev;
1683         struct ieee80211_sub_if_data *sdata;
1684
1685         if (state != NETDEV_CHANGENAME)
1686                 return 0;
1687
1688         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1689                 return 0;
1690
1691         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1692                 return 0;
1693
1694         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1695
1696         memcpy(sdata->name, dev->name, IFNAMSIZ);
1697
1698         ieee80211_debugfs_rename_netdev(sdata);
1699         return 0;
1700 }
1701
1702 static struct notifier_block mac80211_netdev_notifier = {
1703         .notifier_call = netdev_notify,
1704 };
1705
1706 int ieee80211_iface_init(void)
1707 {
1708         return register_netdevice_notifier(&mac80211_netdev_notifier);
1709 }
1710
1711 void ieee80211_iface_exit(void)
1712 {
1713         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1714 }