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                 sdata->vif.cab_queue = master->vif.cab_queue;
 478                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
 479                        sizeof(sdata->vif.hw_queue));
 480                 break;
 481                 }
 482         case NL80211_IFTYPE_AP:
 483                 sdata->bss = &sdata->u.ap;
 484                 break;
 485         case NL80211_IFTYPE_MESH_POINT:
 486         case NL80211_IFTYPE_STATION:
 487         case NL80211_IFTYPE_MONITOR:
 488         case NL80211_IFTYPE_ADHOC:
 489         case NL80211_IFTYPE_P2P_DEVICE:
 490                 /* no special treatment */
 491                 break;
 492         case NL80211_IFTYPE_UNSPECIFIED:
 493         case NUM_NL80211_IFTYPES:
 494         case NL80211_IFTYPE_P2P_CLIENT:
 495         case NL80211_IFTYPE_P2P_GO:
 496                 /* cannot happen */
 497                 WARN_ON(1);
 498                 break;
 499         }
 500
 501         if (local->open_count == 0) {
 502                 res = drv_start(local);
 503                 if (res)
 504                         goto err_del_bss;
 505                 /* we're brought up, everything changes */
 506                 hw_reconf_flags = ~0;
 507                 ieee80211_led_radio(local, true);
 508                 ieee80211_mod_tpt_led_trig(local,
 509                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 510         }
 511
 512         /*
 513          * Copy the hopefully now-present MAC address to
 514          * this interface, if it has the special null one.
 515          */
 516         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 517                 memcpy(dev->dev_addr,
 518                        local->hw.wiphy->perm_addr,
 519                        ETH_ALEN);
 520                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 521
 522                 if (!is_valid_ether_addr(dev->dev_addr)) {
 523                         res = -EADDRNOTAVAIL;
 524                         goto err_stop;
 525                 }
 526         }
 527
 528         switch (sdata->vif.type) {
 529         case NL80211_IFTYPE_AP_VLAN:
 530                 /* no need to tell driver, but set carrier and chanctx */
 531                 if (rtnl_dereference(sdata->bss->beacon)) {
 532                         ieee80211_vif_vlan_copy_chanctx(sdata);
 533                         netif_carrier_on(dev);
 534                 } else {
 535                         netif_carrier_off(dev);
 536                 }
 537                 break;
 538         case NL80211_IFTYPE_MONITOR:
 539                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 540                         local->cooked_mntrs++;
 541                         break;
 542                 }
 543
 544                 if (local->monitors == 0 && local->open_count == 0) {
 545                         res = ieee80211_add_virtual_monitor(local);
 546                         if (res)
 547                                 goto err_stop;
 548                 }
 549
 550                 /* must be before the call to ieee80211_configure_filter */
 551                 local->monitors++;
 552                 if (local->monitors == 1) {
 553                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 554                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 555                 }
 556
 557                 ieee80211_adjust_monitor_flags(sdata, 1);
 558                 ieee80211_configure_filter(local);
 559                 mutex_lock(&local->mtx);
 560                 ieee80211_recalc_idle(local);
 561                 mutex_unlock(&local->mtx);
 562
 563                 netif_carrier_on(dev);
 564                 break;
 565         default:
 566                 if (coming_up) {
 567                         ieee80211_del_virtual_monitor(local);
 568
 569                         res = drv_add_interface(local, sdata);
 570                         if (res)
 571                                 goto err_stop;
 572                         res = ieee80211_check_queues(sdata);
 573                         if (res)
 574                                 goto err_del_interface;
 575                 }
 576
 577                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 578                         local->fif_pspoll++;
 579                         local->fif_probe_req++;
 580
 581                         ieee80211_configure_filter(local);
 582                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 583                         local->fif_probe_req++;
 584                 }
 585
 586                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 587                         changed |= ieee80211_reset_erp_info(sdata);
 588                 ieee80211_bss_info_change_notify(sdata, changed);
 589
 590                 switch (sdata->vif.type) {
 591                 case NL80211_IFTYPE_STATION:
 592                 case NL80211_IFTYPE_ADHOC:
 593                 case NL80211_IFTYPE_AP:
 594                 case NL80211_IFTYPE_MESH_POINT:
 595                         netif_carrier_off(dev);
 596                         break;
 597                 case NL80211_IFTYPE_WDS:
 598                 case NL80211_IFTYPE_P2P_DEVICE:
 599                         break;
 600                 default:
 601                         /* not reached */
 602                         WARN_ON(1);
 603                 }
 604
 605                 /*
 606                  * set default queue parameters so drivers don't
 607                  * need to initialise the hardware if the hardware
 608                  * doesn't start up with sane defaults
 609                  */
 610                 ieee80211_set_wmm_default(sdata, true);
 611         }
 612
 613         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 614
 615         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 616                 /* Create STA entry for the WDS peer */
 617                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 618                                      GFP_KERNEL);
 619                 if (!sta) {
 620                         res = -ENOMEM;
 621                         goto err_del_interface;
 622                 }
 623
 624                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 625                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 626                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 627
 628                 res = sta_info_insert(sta);
 629                 if (res) {
 630                         /* STA has been freed */
 631                         goto err_del_interface;
 632                 }
 633
 634                 rate_control_rate_init(sta);
 635                 netif_carrier_on(dev);
 636         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 637                 rcu_assign_pointer(local->p2p_sdata, sdata);
 638         }
 639
 640         /*
 641          * set_multicast_list will be invoked by the networking core
 642          * which will check whether any increments here were done in
 643          * error and sync them down to the hardware as filter flags.
 644          */
 645         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 646                 atomic_inc(&local->iff_allmultis);
 647
 648         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 649                 atomic_inc(&local->iff_promiscs);
 650
 651         if (coming_up)
 652                 local->open_count++;
 653
 654         if (hw_reconf_flags)
 655                 ieee80211_hw_config(local, hw_reconf_flags);
 656
 657         ieee80211_recalc_ps(local, -1);
 658
 659         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 660             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 661                 /* XXX: for AP_VLAN, actually track AP queues */
 662                 netif_tx_start_all_queues(dev);
 663         } else if (dev) {
 664                 unsigned long flags;
 665                 int n_acs = IEEE80211_NUM_ACS;
 666                 int ac;
 667
 668                 if (local->hw.queues < IEEE80211_NUM_ACS)
 669                         n_acs = 1;
 670
 671                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 672                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 673                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 674                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 675                         for (ac = 0; ac < n_acs; ac++) {
 676                                 int ac_queue = sdata->vif.hw_queue[ac];
 677
 678                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 679                                     skb_queue_empty(&local->pending[ac_queue]))
 680                                         netif_start_subqueue(dev, ac);
 681                         }
 682                 }
 683                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 684         }
 685
 686         return 0;
 687  err_del_interface:
 688         drv_remove_interface(local, sdata);
 689  err_stop:
 690         if (!local->open_count)
 691                 drv_stop(local);
 692  err_del_bss:
 693         sdata->bss = NULL;
 694         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 695                 list_del(&sdata->u.vlan.list);
 696         /* might already be clear but that doesn't matter */
 697         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 698         return res;
 699 }
 700
 701 static int ieee80211_open(struct net_device *dev)
 702 {
 703         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 704         int err;
 705
 706         /* fail early if user set an invalid address */
 707         if (!is_valid_ether_addr(dev->dev_addr))
 708                 return -EADDRNOTAVAIL;
 709
 710         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 711         if (err)
 712                 return err;
 713
 714         return ieee80211_do_open(&sdata->wdev, true);
 715 }
 716
 717 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 718                               bool going_down)
 719 {
 720         struct ieee80211_local *local = sdata->local;
 721         unsigned long flags;
 722         struct sk_buff *skb, *tmp;
 723         u32 hw_reconf_flags = 0;
 724         int i, flushed;
 725         struct ps_data *ps;
 726
 727         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 728
 729         if (rcu_access_pointer(local->scan_sdata) == sdata)
 730                 ieee80211_scan_cancel(local);
 731
 732         /*
 733          * Stop TX on this interface first.
 734          */
 735         if (sdata->dev)
 736                 netif_tx_stop_all_queues(sdata->dev);
 737
 738         ieee80211_roc_purge(local, sdata);
 739
 740         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 741                 ieee80211_mgd_stop(sdata);
 742
 743         /*
 744          * Remove all stations associated with this interface.
 745          *
 746          * This must be done before calling ops->remove_interface()
 747          * because otherwise we can later invoke ops->sta_notify()
 748          * whenever the STAs are removed, and that invalidates driver
 749          * assumptions about always getting a vif pointer that is valid
 750          * (because if we remove a STA after ops->remove_interface()
 751          * the driver will have removed the vif info already!)
 752          *
 753          * This is relevant only in WDS mode, in all other modes we've
 754          * already removed all stations when disconnecting or similar,
 755          * so warn otherwise.
 756          *
 757          * We call sta_info_flush_cleanup() later, to combine RCU waits.
 758          */
 759         flushed = sta_info_flush_defer(sdata);
 760         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 761                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
 762
 763         /* don't count this interface for promisc/allmulti while it is down */
 764         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 765                 atomic_dec(&local->iff_allmultis);
 766
 767         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 768                 atomic_dec(&local->iff_promiscs);
 769
 770         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 771                 local->fif_pspoll--;
 772                 local->fif_probe_req--;
 773         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 774                 local->fif_probe_req--;
 775         }
 776
 777         if (sdata->dev) {
 778                 netif_addr_lock_bh(sdata->dev);
 779                 spin_lock_bh(&local->filter_lock);
 780                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 781                                  sdata->dev->addr_len);
 782                 spin_unlock_bh(&local->filter_lock);
 783                 netif_addr_unlock_bh(sdata->dev);
 784         }
 785
 786         del_timer_sync(&local->dynamic_ps_timer);
 787         cancel_work_sync(&local->dynamic_ps_enable_work);
 788
 789         cancel_work_sync(&sdata->recalc_smps);
 790
 791         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 792
 793         if (sdata->wdev.cac_started) {
 794                 WARN_ON(local->suspended);
 795                 mutex_lock(&local->iflist_mtx);
 796                 ieee80211_vif_release_channel(sdata);
 797                 mutex_unlock(&local->iflist_mtx);
 798                 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
 799                                    GFP_KERNEL);
 800         }
 801
 802         /* APs need special treatment */
 803         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 804                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 805
 806                 /* down all dependent devices, that is VLANs */
 807                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 808                                          u.vlan.list)
 809                         dev_close(vlan->dev);
 810                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 811         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 812                 /* remove all packets in parent bc_buf pointing to this dev */
 813                 ps = &sdata->bss->ps;
 814
 815                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 816                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 817                         if (skb->dev == sdata->dev) {
 818                                 __skb_unlink(skb, &ps->bc_buf);
 819                                 local->total_ps_buffered--;
 820                                 ieee80211_free_txskb(&local->hw, skb);
 821                         }
 822                 }
 823                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 824         }
 825
 826         if (going_down)
 827                 local->open_count--;
 828
 829         switch (sdata->vif.type) {
 830         case NL80211_IFTYPE_AP_VLAN:
 831                 list_del(&sdata->u.vlan.list);
 832                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
 833                 /* no need to tell driver */
 834                 break;
 835         case NL80211_IFTYPE_MONITOR:
 836                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 837                         local->cooked_mntrs--;
 838                         break;
 839                 }
 840
 841                 local->monitors--;
 842                 if (local->monitors == 0) {
 843                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 844                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 845                 }
 846
 847                 ieee80211_adjust_monitor_flags(sdata, -1);
 848                 break;
 849         case NL80211_IFTYPE_P2P_DEVICE:
 850                 /* relies on synchronize_rcu() below */
 851                 rcu_assign_pointer(local->p2p_sdata, NULL);
 852                 /* fall through */
 853         default:
 854                 cancel_work_sync(&sdata->work);
 855                 /*
 856                  * When we get here, the interface is marked down.
 857                  *
 858                  * sta_info_flush_cleanup() requires rcu_barrier()
 859                  * first to wait for the station call_rcu() calls
 860                  * to complete, and we also need synchronize_rcu()
 861                  * to wait for the RX path in case it is using the
 862                  * interface and enqueuing frames at this very time on
 863                  * another CPU.
 864                  */
 865                 synchronize_rcu();
 866                 rcu_barrier();
 867                 sta_info_flush_cleanup(sdata);
 868
 869                 /*
 870                  * Free all remaining keys, there shouldn't be any,
 871                  * except maybe in WDS mode?
 872                  */
 873                 ieee80211_free_keys(sdata);
 874
 875                 /* fall through */
 876         case NL80211_IFTYPE_AP:
 877                 skb_queue_purge(&sdata->skb_queue);
 878         }
 879
 880         sdata->bss = NULL;
 881
 882         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 883         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 884                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 885                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 886                         if (info->control.vif == &sdata->vif) {
 887                                 __skb_unlink(skb, &local->pending[i]);
 888                                 ieee80211_free_txskb(&local->hw, skb);
 889                         }
 890                 }
 891         }
 892         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 893
 894         if (local->open_count == 0)
 895                 ieee80211_clear_tx_pending(local);
 896
 897         /*
 898          * If the interface goes down while suspended, presumably because
 899          * the device was unplugged and that happens before our resume,
 900          * then the driver is already unconfigured and the remainder of
 901          * this function isn't needed.
 902          * XXX: what about WoWLAN? If the device has software state, e.g.
 903          *      memory allocated, it might expect teardown commands from
 904          *      mac80211 here?
 905          */
 906         if (local->suspended) {
 907                 WARN_ON(local->wowlan);
 908                 WARN_ON(rtnl_dereference(local->monitor_sdata));
 909                 return;
 910         }
 911
 912         switch (sdata->vif.type) {
 913         case NL80211_IFTYPE_AP_VLAN:
 914                 break;
 915         case NL80211_IFTYPE_MONITOR:
 916                 if (local->monitors == 0)
 917                         ieee80211_del_virtual_monitor(local);
 918
 919                 mutex_lock(&local->mtx);
 920                 ieee80211_recalc_idle(local);
 921                 mutex_unlock(&local->mtx);
 922                 break;
 923         default:
 924                 if (going_down)
 925                         drv_remove_interface(local, sdata);
 926         }
 927
 928         ieee80211_recalc_ps(local, -1);
 929
 930         if (local->open_count == 0) {
 931                 ieee80211_stop_device(local);
 932
 933                 /* no reconfiguring after stop! */
 934                 return;
 935         }
 936
 937         /* do after stop to avoid reconfiguring when we stop anyway */
 938         ieee80211_configure_filter(local);
 939         ieee80211_hw_config(local, hw_reconf_flags);
 940
 941         if (local->monitors == local->open_count)
 942                 ieee80211_add_virtual_monitor(local);
 943 }
 944
 945 static int ieee80211_stop(struct net_device *dev)
 946 {
 947         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 948
 949         ieee80211_do_stop(sdata, true);
 950
 951         return 0;
 952 }
 953
 954 static void ieee80211_set_multicast_list(struct net_device *dev)
 955 {
 956         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 957         struct ieee80211_local *local = sdata->local;
 958         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 959
 960         allmulti = !!(dev->flags & IFF_ALLMULTI);
 961         promisc = !!(dev->flags & IFF_PROMISC);
 962         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 963         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 964
 965         if (allmulti != sdata_allmulti) {
 966                 if (dev->flags & IFF_ALLMULTI)
 967                         atomic_inc(&local->iff_allmultis);
 968                 else
 969                         atomic_dec(&local->iff_allmultis);
 970                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 971         }
 972
 973         if (promisc != sdata_promisc) {
 974                 if (dev->flags & IFF_PROMISC)
 975                         atomic_inc(&local->iff_promiscs);
 976                 else
 977                         atomic_dec(&local->iff_promiscs);
 978                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 979         }
 980
 981         /*
 982          * TODO: If somebody needs this on AP interfaces,
 983          *       it can be enabled easily but multicast
 984          *       addresses from VLANs need to be synced.
 985          */
 986         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 987             sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
 988             sdata->vif.type != NL80211_IFTYPE_AP)
 989                 drv_set_multicast_list(local, sdata, &dev->mc);
 990
 991         spin_lock_bh(&local->filter_lock);
 992         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 993         spin_unlock_bh(&local->filter_lock);
 994         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 995 }
 996
 997 /*
 998  * Called when the netdev is removed or, by the code below, before
 999  * the interface type changes.
1000  */
1001 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1002 {
1003         int flushed;
1004         int i;
1005
1006         /* free extra data */
1007         ieee80211_free_keys(sdata);
1008
1009         ieee80211_debugfs_remove_netdev(sdata);
1010
1011         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1012                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1013         sdata->fragment_next = 0;
1014
1015         if (ieee80211_vif_is_mesh(&sdata->vif))
1016                 mesh_rmc_free(sdata);
1017
1018         flushed = sta_info_flush(sdata);
1019         WARN_ON(flushed);
1020 }
1021
1022 static void ieee80211_uninit(struct net_device *dev)
1023 {
1024         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1025 }
1026
1027 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1028                                          struct sk_buff *skb)
1029 {
1030         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1031 }
1032
1033 static const struct net_device_ops ieee80211_dataif_ops = {
1034         .ndo_open               = ieee80211_open,
1035         .ndo_stop               = ieee80211_stop,
1036         .ndo_uninit             = ieee80211_uninit,
1037         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1038         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1039         .ndo_change_mtu         = ieee80211_change_mtu,
1040         .ndo_set_mac_address    = ieee80211_change_mac,
1041         .ndo_select_queue       = ieee80211_netdev_select_queue,
1042 };
1043
1044 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1045                                           struct sk_buff *skb)
1046 {
1047         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1048         struct ieee80211_local *local = sdata->local;
1049         struct ieee80211_hdr *hdr;
1050         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1051
1052         if (local->hw.queues < IEEE80211_NUM_ACS)
1053                 return 0;
1054
1055         if (skb->len < 4 ||
1056             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1057                 return 0; /* doesn't matter, frame will be dropped */
1058
1059         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1060
1061         return ieee80211_select_queue_80211(sdata, skb, hdr);
1062 }
1063
1064 static const struct net_device_ops ieee80211_monitorif_ops = {
1065         .ndo_open               = ieee80211_open,
1066         .ndo_stop               = ieee80211_stop,
1067         .ndo_uninit             = ieee80211_uninit,
1068         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1069         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1070         .ndo_change_mtu         = ieee80211_change_mtu,
1071         .ndo_set_mac_address    = eth_mac_addr,
1072         .ndo_select_queue       = ieee80211_monitor_select_queue,
1073 };
1074
1075 static void ieee80211_if_setup(struct net_device *dev)
1076 {
1077         ether_setup(dev);
1078         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1079         dev->netdev_ops = &ieee80211_dataif_ops;
1080         dev->destructor = free_netdev;
1081 }
1082
1083 static void ieee80211_iface_work(struct work_struct *work)
1084 {
1085         struct ieee80211_sub_if_data *sdata =
1086                 container_of(work, struct ieee80211_sub_if_data, work);
1087         struct ieee80211_local *local = sdata->local;
1088         struct sk_buff *skb;
1089         struct sta_info *sta;
1090         struct ieee80211_ra_tid *ra_tid;
1091
1092         if (!ieee80211_sdata_running(sdata))
1093                 return;
1094
1095         if (local->scanning)
1096                 return;
1097
1098         /*
1099          * ieee80211_queue_work() should have picked up most cases,
1100          * here we'll pick the rest.
1101          */
1102         if (WARN(local->suspended,
1103                  "interface work scheduled while going to suspend\n"))
1104                 return;
1105
1106         /* first process frames */
1107         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1108                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1109
1110                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1111                         ra_tid = (void *)&skb->cb;
1112                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1113                                                  ra_tid->tid);
1114                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1115                         ra_tid = (void *)&skb->cb;
1116                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1117                                                 ra_tid->tid);
1118                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1119                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1120                         int len = skb->len;
1121
1122                         mutex_lock(&local->sta_mtx);
1123                         sta = sta_info_get_bss(sdata, mgmt->sa);
1124                         if (sta) {
1125                                 switch (mgmt->u.action.u.addba_req.action_code) {
1126                                 case WLAN_ACTION_ADDBA_REQ:
1127                                         ieee80211_process_addba_request(
1128                                                         local, sta, mgmt, len);
1129                                         break;
1130                                 case WLAN_ACTION_ADDBA_RESP:
1131                                         ieee80211_process_addba_resp(local, sta,
1132                                                                      mgmt, len);
1133                                         break;
1134                                 case WLAN_ACTION_DELBA:
1135                                         ieee80211_process_delba(sdata, sta,
1136                                                                 mgmt, len);
1137                                         break;
1138                                 default:
1139                                         WARN_ON(1);
1140                                         break;
1141                                 }
1142                         }
1143                         mutex_unlock(&local->sta_mtx);
1144                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1145                         struct ieee80211_hdr *hdr = (void *)mgmt;
1146                         /*
1147                          * So the frame isn't mgmt, but frame_control
1148                          * is at the right place anyway, of course, so
1149                          * the if statement is correct.
1150                          *
1151                          * Warn if we have other data frame types here,
1152                          * they must not get here.
1153                          */
1154                         WARN_ON(hdr->frame_control &
1155                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1156                         WARN_ON(!(hdr->seq_ctrl &
1157                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1158                         /*
1159                          * This was a fragment of a frame, received while
1160                          * a block-ack session was active. That cannot be
1161                          * right, so terminate the session.
1162                          */
1163                         mutex_lock(&local->sta_mtx);
1164                         sta = sta_info_get_bss(sdata, mgmt->sa);
1165                         if (sta) {
1166                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1167                                                 IEEE80211_QOS_CTL_TID_MASK;
1168
1169                                 __ieee80211_stop_rx_ba_session(
1170                                         sta, tid, WLAN_BACK_RECIPIENT,
1171                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1172                                         true);
1173                         }
1174                         mutex_unlock(&local->sta_mtx);
1175                 } else switch (sdata->vif.type) {
1176                 case NL80211_IFTYPE_STATION:
1177                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1178                         break;
1179                 case NL80211_IFTYPE_ADHOC:
1180                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1181                         break;
1182                 case NL80211_IFTYPE_MESH_POINT:
1183                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1184                                 break;
1185                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1186                         break;
1187                 default:
1188                         WARN(1, "frame for unexpected interface type");
1189                         break;
1190                 }
1191
1192                 kfree_skb(skb);
1193         }
1194
1195         /* then other type-dependent work */
1196         switch (sdata->vif.type) {
1197         case NL80211_IFTYPE_STATION:
1198                 ieee80211_sta_work(sdata);
1199                 break;
1200         case NL80211_IFTYPE_ADHOC:
1201                 ieee80211_ibss_work(sdata);
1202                 break;
1203         case NL80211_IFTYPE_MESH_POINT:
1204                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1205                         break;
1206                 ieee80211_mesh_work(sdata);
1207                 break;
1208         default:
1209                 break;
1210         }
1211 }
1212
1213 static void ieee80211_recalc_smps_work(struct work_struct *work)
1214 {
1215         struct ieee80211_sub_if_data *sdata =
1216                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1217
1218         ieee80211_recalc_smps(sdata);
1219 }
1220
1221 /*
1222  * Helper function to initialise an interface to a specific type.
1223  */
1224 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1225                                   enum nl80211_iftype type)
1226 {
1227         /* clear type-dependent union */
1228         memset(&sdata->u, 0, sizeof(sdata->u));
1229
1230         /* and set some type-dependent values */
1231         sdata->vif.type = type;
1232         sdata->vif.p2p = false;
1233         sdata->wdev.iftype = type;
1234
1235         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1236         sdata->control_port_no_encrypt = false;
1237
1238         sdata->noack_map = 0;
1239
1240         /* only monitor/p2p-device differ */
1241         if (sdata->dev) {
1242                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1243                 sdata->dev->type = ARPHRD_ETHER;
1244         }
1245
1246         skb_queue_head_init(&sdata->skb_queue);
1247         INIT_WORK(&sdata->work, ieee80211_iface_work);
1248         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1249
1250         switch (type) {
1251         case NL80211_IFTYPE_P2P_GO:
1252                 type = NL80211_IFTYPE_AP;
1253                 sdata->vif.type = type;
1254                 sdata->vif.p2p = true;
1255                 /* fall through */
1256         case NL80211_IFTYPE_AP:
1257                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1258                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1259                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1260                 break;
1261         case NL80211_IFTYPE_P2P_CLIENT:
1262                 type = NL80211_IFTYPE_STATION;
1263                 sdata->vif.type = type;
1264                 sdata->vif.p2p = true;
1265                 /* fall through */
1266         case NL80211_IFTYPE_STATION:
1267                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1268                 ieee80211_sta_setup_sdata(sdata);
1269                 break;
1270         case NL80211_IFTYPE_ADHOC:
1271                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1272                 ieee80211_ibss_setup_sdata(sdata);
1273                 break;
1274         case NL80211_IFTYPE_MESH_POINT:
1275                 if (ieee80211_vif_is_mesh(&sdata->vif))
1276                         ieee80211_mesh_init_sdata(sdata);
1277                 break;
1278         case NL80211_IFTYPE_MONITOR:
1279                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1280                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1281                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1282                                       MONITOR_FLAG_OTHER_BSS;
1283                 break;
1284         case NL80211_IFTYPE_WDS:
1285                 sdata->vif.bss_conf.bssid = NULL;
1286                 break;
1287         case NL80211_IFTYPE_AP_VLAN:
1288                 break;
1289         case NL80211_IFTYPE_P2P_DEVICE:
1290                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1291                 break;
1292         case NL80211_IFTYPE_UNSPECIFIED:
1293         case NUM_NL80211_IFTYPES:
1294                 BUG();
1295                 break;
1296         }
1297
1298         ieee80211_debugfs_add_netdev(sdata);
1299 }
1300
1301 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1302                                            enum nl80211_iftype type)
1303 {
1304         struct ieee80211_local *local = sdata->local;
1305         int ret, err;
1306         enum nl80211_iftype internal_type = type;
1307         bool p2p = false;
1308
1309         ASSERT_RTNL();
1310
1311         if (!local->ops->change_interface)
1312                 return -EBUSY;
1313
1314         switch (sdata->vif.type) {
1315         case NL80211_IFTYPE_AP:
1316         case NL80211_IFTYPE_STATION:
1317         case NL80211_IFTYPE_ADHOC:
1318                 /*
1319                  * Could maybe also all others here?
1320                  * Just not sure how that interacts
1321                  * with the RX/config path e.g. for
1322                  * mesh.
1323                  */
1324                 break;
1325         default:
1326                 return -EBUSY;
1327         }
1328
1329         switch (type) {
1330         case NL80211_IFTYPE_AP:
1331         case NL80211_IFTYPE_STATION:
1332         case NL80211_IFTYPE_ADHOC:
1333                 /*
1334                  * Could probably support everything
1335                  * but WDS here (WDS do_open can fail
1336                  * under memory pressure, which this
1337                  * code isn't prepared to handle).
1338                  */
1339                 break;
1340         case NL80211_IFTYPE_P2P_CLIENT:
1341                 p2p = true;
1342                 internal_type = NL80211_IFTYPE_STATION;
1343                 break;
1344         case NL80211_IFTYPE_P2P_GO:
1345                 p2p = true;
1346                 internal_type = NL80211_IFTYPE_AP;
1347                 break;
1348         default:
1349                 return -EBUSY;
1350         }
1351
1352         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1353         if (ret)
1354                 return ret;
1355
1356         ieee80211_do_stop(sdata, false);
1357
1358         ieee80211_teardown_sdata(sdata);
1359
1360         ret = drv_change_interface(local, sdata, internal_type, p2p);
1361         if (ret)
1362                 type = sdata->vif.type;
1363
1364         /*
1365          * Ignore return value here, there's not much we can do since
1366          * the driver changed the interface type internally already.
1367          * The warnings will hopefully make driver authors fix it :-)
1368          */
1369         ieee80211_check_queues(sdata);
1370
1371         ieee80211_setup_sdata(sdata, type);
1372
1373         err = ieee80211_do_open(&sdata->wdev, false);
1374         WARN(err, "type change: do_open returned %d", err);
1375
1376         return ret;
1377 }
1378
1379 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1380                              enum nl80211_iftype type)
1381 {
1382         int ret;
1383
1384         ASSERT_RTNL();
1385
1386         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1387                 return 0;
1388
1389         if (ieee80211_sdata_running(sdata)) {
1390                 ret = ieee80211_runtime_change_iftype(sdata, type);
1391                 if (ret)
1392                         return ret;
1393         } else {
1394                 /* Purge and reset type-dependent state. */
1395                 ieee80211_teardown_sdata(sdata);
1396                 ieee80211_setup_sdata(sdata, type);
1397         }
1398
1399         /* reset some values that shouldn't be kept across type changes */
1400         sdata->drop_unencrypted = 0;
1401         if (type == NL80211_IFTYPE_STATION)
1402                 sdata->u.mgd.use_4addr = false;
1403
1404         return 0;
1405 }
1406
1407 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1408                                        u8 *perm_addr, enum nl80211_iftype type)
1409 {
1410         struct ieee80211_sub_if_data *sdata;
1411         u64 mask, start, addr, val, inc;
1412         u8 *m;
1413         u8 tmp_addr[ETH_ALEN];
1414         int i;
1415
1416         /* default ... something at least */
1417         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1418
1419         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1420             local->hw.wiphy->n_addresses <= 1)
1421                 return;
1422
1423         mutex_lock(&local->iflist_mtx);
1424
1425         switch (type) {
1426         case NL80211_IFTYPE_MONITOR:
1427                 /* doesn't matter */
1428                 break;
1429         case NL80211_IFTYPE_WDS:
1430         case NL80211_IFTYPE_AP_VLAN:
1431                 /* match up with an AP interface */
1432                 list_for_each_entry(sdata, &local->interfaces, list) {
1433                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1434                                 continue;
1435                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1436                         break;
1437                 }
1438                 /* keep default if no AP interface present */
1439                 break;
1440         case NL80211_IFTYPE_P2P_CLIENT:
1441         case NL80211_IFTYPE_P2P_GO:
1442                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1443                         list_for_each_entry(sdata, &local->interfaces, list) {
1444                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1445                                         continue;
1446                                 if (!ieee80211_sdata_running(sdata))
1447                                         continue;
1448                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1449                                 goto out_unlock;
1450                         }
1451                 }
1452                 /* otherwise fall through */
1453         default:
1454                 /* assign a new address if possible -- try n_addresses first */
1455                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1456                         bool used = false;
1457
1458                         list_for_each_entry(sdata, &local->interfaces, list) {
1459                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1460                                            sdata->vif.addr, ETH_ALEN) == 0) {
1461                                         used = true;
1462                                         break;
1463                                 }
1464                         }
1465
1466                         if (!used) {
1467                                 memcpy(perm_addr,
1468                                        local->hw.wiphy->addresses[i].addr,
1469                                        ETH_ALEN);
1470                                 break;
1471                         }
1472                 }
1473
1474                 /* try mask if available */
1475                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1476                         break;
1477
1478                 m = local->hw.wiphy->addr_mask;
1479                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1480                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1481                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1482
1483                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1484                         /* not a contiguous mask ... not handled now! */
1485                         pr_info("not contiguous\n");
1486                         break;
1487                 }
1488
1489                 m = local->hw.wiphy->perm_addr;
1490                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1491                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1492                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1493
1494                 inc = 1ULL<<__ffs64(mask);
1495                 val = (start & mask);
1496                 addr = (start & ~mask) | (val & mask);
1497                 do {
1498                         bool used = false;
1499
1500                         tmp_addr[5] = addr >> 0*8;
1501                         tmp_addr[4] = addr >> 1*8;
1502                         tmp_addr[3] = addr >> 2*8;
1503                         tmp_addr[2] = addr >> 3*8;
1504                         tmp_addr[1] = addr >> 4*8;
1505                         tmp_addr[0] = addr >> 5*8;
1506
1507                         val += inc;
1508
1509                         list_for_each_entry(sdata, &local->interfaces, list) {
1510                                 if (memcmp(tmp_addr, sdata->vif.addr,
1511                                                         ETH_ALEN) == 0) {
1512                                         used = true;
1513                                         break;
1514                                 }
1515                         }
1516
1517                         if (!used) {
1518                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1519                                 break;
1520                         }
1521                         addr = (start & ~mask) | (val & mask);
1522                 } while (addr != start);
1523
1524                 break;
1525         }
1526
1527  out_unlock:
1528         mutex_unlock(&local->iflist_mtx);
1529 }
1530
1531 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1532 {
1533         struct ieee80211_sub_if_data *sdata;
1534
1535         sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1536
1537         ieee80211_cleanup_sdata_stas(sdata);
1538 }
1539
1540 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1541                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1542                      struct vif_params *params)
1543 {
1544         struct net_device *ndev = NULL;
1545         struct ieee80211_sub_if_data *sdata = NULL;
1546         int ret, i;
1547         int txqs = 1;
1548
1549         ASSERT_RTNL();
1550
1551         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1552                 struct wireless_dev *wdev;
1553
1554                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1555                                 GFP_KERNEL);
1556                 if (!sdata)
1557                         return -ENOMEM;
1558                 wdev = &sdata->wdev;
1559
1560                 sdata->dev = NULL;
1561                 strlcpy(sdata->name, name, IFNAMSIZ);
1562                 ieee80211_assign_perm_addr(local, wdev->address, type);
1563                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1564         } else {
1565                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1566                         txqs = IEEE80211_NUM_ACS;
1567
1568                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1569                                         local->hw.vif_data_size,
1570                                         name, ieee80211_if_setup, txqs, 1);
1571                 if (!ndev)
1572                         return -ENOMEM;
1573                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1574
1575                 ndev->needed_headroom = local->tx_headroom +
1576                                         4*6 /* four MAC addresses */
1577                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1578                                         + 6 /* mesh */
1579                                         + 8 /* rfc1042/bridge tunnel */
1580                                         - ETH_HLEN /* ethernet hard_header_len */
1581                                         + IEEE80211_ENCRYPT_HEADROOM;
1582                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1583
1584                 ret = dev_alloc_name(ndev, ndev->name);
1585                 if (ret < 0) {
1586                         free_netdev(ndev);
1587                         return ret;
1588                 }
1589
1590                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1591                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1592                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1593
1594                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1595                 sdata = netdev_priv(ndev);
1596                 ndev->ieee80211_ptr = &sdata->wdev;
1597                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1598                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1599
1600                 sdata->dev = ndev;
1601         }
1602
1603         /* initialise type-independent data */
1604         sdata->wdev.wiphy = local->hw.wiphy;
1605         sdata->local = local;
1606
1607         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1608                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1609
1610         INIT_LIST_HEAD(&sdata->key_list);
1611
1612         spin_lock_init(&sdata->cleanup_stations_lock);
1613         INIT_LIST_HEAD(&sdata->cleanup_stations);
1614         INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1615         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1616                           ieee80211_dfs_cac_timer_work);
1617         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1618                           ieee80211_delayed_tailroom_dec);
1619
1620         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1621                 struct ieee80211_supported_band *sband;
1622                 sband = local->hw.wiphy->bands[i];
1623                 sdata->rc_rateidx_mask[i] =
1624                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1625                 if (sband)
1626                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1627                                sband->ht_cap.mcs.rx_mask,
1628                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1629                 else
1630                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1631                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1632         }
1633
1634         ieee80211_set_default_queues(sdata);
1635
1636         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1637         sdata->user_power_level = local->user_power_level;
1638
1639         /* setup type-dependent data */
1640         ieee80211_setup_sdata(sdata, type);
1641
1642         if (ndev) {
1643                 if (params) {
1644                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1645                         if (type == NL80211_IFTYPE_STATION)
1646                                 sdata->u.mgd.use_4addr = params->use_4addr;
1647                 }
1648
1649                 ndev->features |= local->hw.netdev_features;
1650
1651                 ret = register_netdevice(ndev);
1652                 if (ret) {
1653                         free_netdev(ndev);
1654                         return ret;
1655                 }
1656         }
1657
1658         mutex_lock(&local->iflist_mtx);
1659         list_add_tail_rcu(&sdata->list, &local->interfaces);
1660         mutex_unlock(&local->iflist_mtx);
1661
1662         if (new_wdev)
1663                 *new_wdev = &sdata->wdev;
1664
1665         return 0;
1666 }
1667
1668 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1669 {
1670         ASSERT_RTNL();
1671
1672         mutex_lock(&sdata->local->iflist_mtx);
1673         list_del_rcu(&sdata->list);
1674         mutex_unlock(&sdata->local->iflist_mtx);
1675
1676         synchronize_rcu();
1677
1678         if (sdata->dev) {
1679                 unregister_netdevice(sdata->dev);
1680         } else {
1681                 cfg80211_unregister_wdev(&sdata->wdev);
1682                 kfree(sdata);
1683         }
1684 }
1685
1686 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1687 {
1688         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1689                 return;
1690         ieee80211_do_stop(sdata, true);
1691         ieee80211_teardown_sdata(sdata);
1692 }
1693
1694 /*
1695  * Remove all interfaces, may only be called at hardware unregistration
1696  * time because it doesn't do RCU-safe list removals.
1697  */
1698 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1699 {
1700         struct ieee80211_sub_if_data *sdata, *tmp;
1701         LIST_HEAD(unreg_list);
1702         LIST_HEAD(wdev_list);
1703
1704         ASSERT_RTNL();
1705
1706         /*
1707          * Close all AP_VLAN interfaces first, as otherwise they
1708          * might be closed while the AP interface they belong to
1709          * is closed, causing unregister_netdevice_many() to crash.
1710          */
1711         list_for_each_entry(sdata, &local->interfaces, list)
1712                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1713                         dev_close(sdata->dev);
1714
1715         mutex_lock(&local->iflist_mtx);
1716         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1717                 list_del(&sdata->list);
1718
1719                 if (sdata->dev)
1720                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1721                 else
1722                         list_add(&sdata->list, &wdev_list);
1723         }
1724         mutex_unlock(&local->iflist_mtx);
1725         unregister_netdevice_many(&unreg_list);
1726         list_del(&unreg_list);
1727
1728         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1729                 list_del(&sdata->list);
1730                 cfg80211_unregister_wdev(&sdata->wdev);
1731                 kfree(sdata);
1732         }
1733 }
1734
1735 static int netdev_notify(struct notifier_block *nb,
1736                          unsigned long state,
1737                          void *ndev)
1738 {
1739         struct net_device *dev = ndev;
1740         struct ieee80211_sub_if_data *sdata;
1741
1742         if (state != NETDEV_CHANGENAME)
1743                 return 0;
1744
1745         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1746                 return 0;
1747
1748         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1749                 return 0;
1750
1751         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1752
1753         memcpy(sdata->name, dev->name, IFNAMSIZ);
1754
1755         ieee80211_debugfs_rename_netdev(sdata);
1756         return 0;
1757 }
1758
1759 static struct notifier_block mac80211_netdev_notifier = {
1760         .notifier_call = netdev_notify,
1761 };
1762
1763 int ieee80211_iface_init(void)
1764 {
1765         return register_netdevice_notifier(&mac80211_netdev_notifier);
1766 }
1767
1768 void ieee80211_iface_exit(void)
1769 {
1770         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1771 }