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_sub_if_data *sdata, u8 *addr,
 163                                 bool check_dup)
 164 {
 165         struct ieee80211_local *local = sdata->local;
 166         struct ieee80211_sub_if_data *iter;
 167         u64 new, mask, tmp;
 168         u8 *m;
 169         int ret = 0;
 170
 171         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 172                 return 0;
 173
 174         m = addr;
 175         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 176                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 177                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 178
 179         m = local->hw.wiphy->addr_mask;
 180         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 181                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 182                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 183
 184         if (!check_dup)
 185                 return ret;
 186
 187         mutex_lock(&local->iflist_mtx);
 188         list_for_each_entry(iter, &local->interfaces, list) {
 189                 if (iter == sdata)
 190                         continue;
 191
 192                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 193                     !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 194                         continue;
 195
 196                 m = iter->vif.addr;
 197                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 198                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 199                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 200
 201                 if ((new & ~mask) != (tmp & ~mask)) {
 202                         ret = -EINVAL;
 203                         break;
 204                 }
 205         }
 206         mutex_unlock(&local->iflist_mtx);
 207
 208         return ret;
 209 }
 210
 211 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 212 {
 213         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 214         struct sockaddr *sa = addr;
 215         bool check_dup = true;
 216         int ret;
 217
 218         if (ieee80211_sdata_running(sdata))
 219                 return -EBUSY;
 220
 221         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 222             !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 223                 check_dup = false;
 224
 225         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 226         if (ret)
 227                 return ret;
 228
 229         ret = eth_mac_addr(dev, sa);
 230
 231         if (ret == 0)
 232                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 233
 234         return ret;
 235 }
 236
 237 static inline int identical_mac_addr_allowed(int type1, int type2)
 238 {
 239         return type1 == NL80211_IFTYPE_MONITOR ||
 240                 type2 == NL80211_IFTYPE_MONITOR ||
 241                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 242                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 243                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 244                 (type1 == NL80211_IFTYPE_WDS &&
 245                         (type2 == NL80211_IFTYPE_WDS ||
 246                          type2 == NL80211_IFTYPE_AP)) ||
 247                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 248                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 249                         (type2 == NL80211_IFTYPE_AP ||
 250                          type2 == NL80211_IFTYPE_AP_VLAN));
 251 }
 252
 253 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 254                                             enum nl80211_iftype iftype)
 255 {
 256         struct ieee80211_local *local = sdata->local;
 257         struct ieee80211_sub_if_data *nsdata;
 258
 259         ASSERT_RTNL();
 260
 261         /* we hold the RTNL here so can safely walk the list */
 262         list_for_each_entry(nsdata, &local->interfaces, list) {
 263                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 264                         /*
 265                          * Allow only a single IBSS interface to be up at any
 266                          * time. This is restricted because beacon distribution
 267                          * cannot work properly if both are in the same IBSS.
 268                          *
 269                          * To remove this restriction we'd have to disallow them
 270                          * from setting the same SSID on different IBSS interfaces
 271                          * belonging to the same hardware. Then, however, we're
 272                          * faced with having to adopt two different TSF timers...
 273                          */
 274                         if (iftype == NL80211_IFTYPE_ADHOC &&
 275                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 276                                 return -EBUSY;
 277
 278                         /*
 279                          * The remaining checks are only performed for interfaces
 280                          * with the same MAC address.
 281                          */
 282                         if (!ether_addr_equal(sdata->vif.addr,
 283                                               nsdata->vif.addr))
 284                                 continue;
 285
 286                         /*
 287                          * check whether it may have the same address
 288                          */
 289                         if (!identical_mac_addr_allowed(iftype,
 290                                                         nsdata->vif.type))
 291                                 return -ENOTUNIQ;
 292
 293                         /*
 294                          * can only add VLANs to enabled APs
 295                          */
 296                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 297                             nsdata->vif.type == NL80211_IFTYPE_AP)
 298                                 sdata->bss = &nsdata->u.ap;
 299                 }
 300         }
 301
 302         return 0;
 303 }
 304
 305 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
 306 {
 307         int n_queues = sdata->local->hw.queues;
 308         int i;
 309
 310         if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
 311                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 312                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 313                                          IEEE80211_INVAL_HW_QUEUE))
 314                                 return -EINVAL;
 315                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 316                                          n_queues))
 317                                 return -EINVAL;
 318                 }
 319         }
 320
 321         if ((sdata->vif.type != NL80211_IFTYPE_AP &&
 322              sdata->vif.type != NL80211_IFTYPE_MESH_POINT) ||
 323             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
 324                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 325                 return 0;
 326         }
 327
 328         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 329                 return -EINVAL;
 330
 331         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 332                 return -EINVAL;
 333
 334         return 0;
 335 }
 336
 337 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 338                                     const int offset)
 339 {
 340         struct ieee80211_local *local = sdata->local;
 341         u32 flags = sdata->u.mntr_flags;
 342
 343 #define ADJUST(_f, _s)  do {                                    \
 344         if (flags & MONITOR_FLAG_##_f)                          \
 345                 local->fif_##_s += offset;                      \
 346         } while (0)
 347
 348         ADJUST(FCSFAIL, fcsfail);
 349         ADJUST(PLCPFAIL, plcpfail);
 350         ADJUST(CONTROL, control);
 351         ADJUST(CONTROL, pspoll);
 352         ADJUST(OTHER_BSS, other_bss);
 353
 354 #undef ADJUST
 355 }
 356
 357 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 358 {
 359         struct ieee80211_local *local = sdata->local;
 360         int i;
 361
 362         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 363                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
 364                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 365                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 366                         sdata->vif.hw_queue[i] = i;
 367                 else
 368                         sdata->vif.hw_queue[i] = 0;
 369         }
 370         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 371 }
 372
 373 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 374 {
 375         struct ieee80211_sub_if_data *sdata;
 376         int ret;
 377
 378         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 379                 return 0;
 380
 381         ASSERT_RTNL();
 382
 383         if (local->monitor_sdata)
 384                 return 0;
 385
 386         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 387         if (!sdata)
 388                 return -ENOMEM;
 389
 390         /* set up data */
 391         sdata->local = local;
 392         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 393         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 394                  wiphy_name(local->hw.wiphy));
 395
 396         ieee80211_set_default_queues(sdata);
 397
 398         ret = drv_add_interface(local, sdata);
 399         if (WARN_ON(ret)) {
 400                 /* ok .. stupid driver, it asked for this! */
 401                 kfree(sdata);
 402                 return ret;
 403         }
 404
 405         ret = ieee80211_check_queues(sdata);
 406         if (ret) {
 407                 kfree(sdata);
 408                 return ret;
 409         }
 410
 411         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 412                                         IEEE80211_CHANCTX_EXCLUSIVE);
 413         if (ret) {
 414                 drv_remove_interface(local, sdata);
 415                 kfree(sdata);
 416                 return ret;
 417         }
 418
 419         mutex_lock(&local->iflist_mtx);
 420         rcu_assign_pointer(local->monitor_sdata, sdata);
 421         mutex_unlock(&local->iflist_mtx);
 422
 423         return 0;
 424 }
 425
 426 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 427 {
 428         struct ieee80211_sub_if_data *sdata;
 429
 430         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 431                 return;
 432
 433         ASSERT_RTNL();
 434
 435         mutex_lock(&local->iflist_mtx);
 436
 437         sdata = rcu_dereference_protected(local->monitor_sdata,
 438                                           lockdep_is_held(&local->iflist_mtx));
 439         if (!sdata) {
 440                 mutex_unlock(&local->iflist_mtx);
 441                 return;
 442         }
 443
 444         rcu_assign_pointer(local->monitor_sdata, NULL);
 445         mutex_unlock(&local->iflist_mtx);
 446
 447         synchronize_net();
 448
 449         ieee80211_vif_release_channel(sdata);
 450
 451         drv_remove_interface(local, sdata);
 452
 453         kfree(sdata);
 454 }
 455
 456 /*
 457  * NOTE: Be very careful when changing this function, it must NOT return
 458  * an error on interface type changes that have been pre-checked, so most
 459  * checks should be in ieee80211_check_concurrent_iface.
 460  */
 461 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 462 {
 463         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 464         struct net_device *dev = wdev->netdev;
 465         struct ieee80211_local *local = sdata->local;
 466         struct sta_info *sta;
 467         u32 changed = 0;
 468         int res;
 469         u32 hw_reconf_flags = 0;
 470
 471         switch (sdata->vif.type) {
 472         case NL80211_IFTYPE_WDS:
 473                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 474                         return -ENOLINK;
 475                 break;
 476         case NL80211_IFTYPE_AP_VLAN: {
 477                 struct ieee80211_sub_if_data *master;
 478
 479                 if (!sdata->bss)
 480                         return -ENOLINK;
 481
 482                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 483
 484                 master = container_of(sdata->bss,
 485                                       struct ieee80211_sub_if_data, u.ap);
 486                 sdata->control_port_protocol =
 487                         master->control_port_protocol;
 488                 sdata->control_port_no_encrypt =
 489                         master->control_port_no_encrypt;
 490                 sdata->vif.cab_queue = master->vif.cab_queue;
 491                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
 492                        sizeof(sdata->vif.hw_queue));
 493                 break;
 494                 }
 495         case NL80211_IFTYPE_AP:
 496                 sdata->bss = &sdata->u.ap;
 497                 break;
 498         case NL80211_IFTYPE_MESH_POINT:
 499         case NL80211_IFTYPE_STATION:
 500         case NL80211_IFTYPE_MONITOR:
 501         case NL80211_IFTYPE_ADHOC:
 502         case NL80211_IFTYPE_P2P_DEVICE:
 503                 /* no special treatment */
 504                 break;
 505         case NL80211_IFTYPE_UNSPECIFIED:
 506         case NUM_NL80211_IFTYPES:
 507         case NL80211_IFTYPE_P2P_CLIENT:
 508         case NL80211_IFTYPE_P2P_GO:
 509                 /* cannot happen */
 510                 WARN_ON(1);
 511                 break;
 512         }
 513
 514         if (local->open_count == 0) {
 515                 res = drv_start(local);
 516                 if (res)
 517                         goto err_del_bss;
 518                 /* we're brought up, everything changes */
 519                 hw_reconf_flags = ~0;
 520                 ieee80211_led_radio(local, true);
 521                 ieee80211_mod_tpt_led_trig(local,
 522                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 523         }
 524
 525         /*
 526          * Copy the hopefully now-present MAC address to
 527          * this interface, if it has the special null one.
 528          */
 529         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 530                 memcpy(dev->dev_addr,
 531                        local->hw.wiphy->perm_addr,
 532                        ETH_ALEN);
 533                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 534
 535                 if (!is_valid_ether_addr(dev->dev_addr)) {
 536                         res = -EADDRNOTAVAIL;
 537                         goto err_stop;
 538                 }
 539         }
 540
 541         switch (sdata->vif.type) {
 542         case NL80211_IFTYPE_AP_VLAN:
 543                 /* no need to tell driver, but set carrier and chanctx */
 544                 if (rtnl_dereference(sdata->bss->beacon)) {
 545                         ieee80211_vif_vlan_copy_chanctx(sdata);
 546                         netif_carrier_on(dev);
 547                 } else {
 548                         netif_carrier_off(dev);
 549                 }
 550                 break;
 551         case NL80211_IFTYPE_MONITOR:
 552                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 553                         local->cooked_mntrs++;
 554                         break;
 555                 }
 556
 557                 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
 558                         res = drv_add_interface(local, sdata);
 559                         if (res)
 560                                 goto err_stop;
 561                 } else if (local->monitors == 0 && local->open_count == 0) {
 562                         res = ieee80211_add_virtual_monitor(local);
 563                         if (res)
 564                                 goto err_stop;
 565                 }
 566
 567                 /* must be before the call to ieee80211_configure_filter */
 568                 local->monitors++;
 569                 if (local->monitors == 1) {
 570                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 571                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 572                 }
 573
 574                 ieee80211_adjust_monitor_flags(sdata, 1);
 575                 ieee80211_configure_filter(local);
 576                 mutex_lock(&local->mtx);
 577                 ieee80211_recalc_idle(local);
 578                 mutex_unlock(&local->mtx);
 579
 580                 netif_carrier_on(dev);
 581                 break;
 582         default:
 583                 if (coming_up) {
 584                         ieee80211_del_virtual_monitor(local);
 585
 586                         res = drv_add_interface(local, sdata);
 587                         if (res)
 588                                 goto err_stop;
 589                         res = ieee80211_check_queues(sdata);
 590                         if (res)
 591                                 goto err_del_interface;
 592                 }
 593
 594                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 595                         local->fif_pspoll++;
 596                         local->fif_probe_req++;
 597
 598                         ieee80211_configure_filter(local);
 599                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 600                         local->fif_probe_req++;
 601                 }
 602
 603                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 604                         changed |= ieee80211_reset_erp_info(sdata);
 605                 ieee80211_bss_info_change_notify(sdata, changed);
 606
 607                 switch (sdata->vif.type) {
 608                 case NL80211_IFTYPE_STATION:
 609                 case NL80211_IFTYPE_ADHOC:
 610                 case NL80211_IFTYPE_AP:
 611                 case NL80211_IFTYPE_MESH_POINT:
 612                         netif_carrier_off(dev);
 613                         break;
 614                 case NL80211_IFTYPE_WDS:
 615                 case NL80211_IFTYPE_P2P_DEVICE:
 616                         break;
 617                 default:
 618                         /* not reached */
 619                         WARN_ON(1);
 620                 }
 621
 622                 /*
 623                  * set default queue parameters so drivers don't
 624                  * need to initialise the hardware if the hardware
 625                  * doesn't start up with sane defaults
 626                  */
 627                 ieee80211_set_wmm_default(sdata, true);
 628         }
 629
 630         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 631
 632         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 633                 /* Create STA entry for the WDS peer */
 634                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 635                                      GFP_KERNEL);
 636                 if (!sta) {
 637                         res = -ENOMEM;
 638                         goto err_del_interface;
 639                 }
 640
 641                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 642                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 643                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 644
 645                 res = sta_info_insert(sta);
 646                 if (res) {
 647                         /* STA has been freed */
 648                         goto err_del_interface;
 649                 }
 650
 651                 rate_control_rate_init(sta);
 652                 netif_carrier_on(dev);
 653         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 654                 rcu_assign_pointer(local->p2p_sdata, sdata);
 655         }
 656
 657         /*
 658          * set_multicast_list will be invoked by the networking core
 659          * which will check whether any increments here were done in
 660          * error and sync them down to the hardware as filter flags.
 661          */
 662         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 663                 atomic_inc(&local->iff_allmultis);
 664
 665         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 666                 atomic_inc(&local->iff_promiscs);
 667
 668         if (coming_up)
 669                 local->open_count++;
 670
 671         if (hw_reconf_flags)
 672                 ieee80211_hw_config(local, hw_reconf_flags);
 673
 674         ieee80211_recalc_ps(local, -1);
 675
 676         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 677             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 678                 /* XXX: for AP_VLAN, actually track AP queues */
 679                 netif_tx_start_all_queues(dev);
 680         } else if (dev) {
 681                 unsigned long flags;
 682                 int n_acs = IEEE80211_NUM_ACS;
 683                 int ac;
 684
 685                 if (local->hw.queues < IEEE80211_NUM_ACS)
 686                         n_acs = 1;
 687
 688                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 689                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 690                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 691                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 692                         for (ac = 0; ac < n_acs; ac++) {
 693                                 int ac_queue = sdata->vif.hw_queue[ac];
 694
 695                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 696                                     skb_queue_empty(&local->pending[ac_queue]))
 697                                         netif_start_subqueue(dev, ac);
 698                         }
 699                 }
 700                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 701         }
 702
 703         return 0;
 704  err_del_interface:
 705         drv_remove_interface(local, sdata);
 706  err_stop:
 707         if (!local->open_count)
 708                 drv_stop(local);
 709  err_del_bss:
 710         sdata->bss = NULL;
 711         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 712                 list_del(&sdata->u.vlan.list);
 713         /* might already be clear but that doesn't matter */
 714         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 715         return res;
 716 }
 717
 718 static int ieee80211_open(struct net_device *dev)
 719 {
 720         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 721         int err;
 722
 723         /* fail early if user set an invalid address */
 724         if (!is_valid_ether_addr(dev->dev_addr))
 725                 return -EADDRNOTAVAIL;
 726
 727         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 728         if (err)
 729                 return err;
 730
 731         return ieee80211_do_open(&sdata->wdev, true);
 732 }
 733
 734 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 735                               bool going_down)
 736 {
 737         struct ieee80211_local *local = sdata->local;
 738         unsigned long flags;
 739         struct sk_buff *skb, *tmp;
 740         u32 hw_reconf_flags = 0;
 741         int i, flushed;
 742         struct ps_data *ps;
 743
 744         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 745
 746         if (rcu_access_pointer(local->scan_sdata) == sdata)
 747                 ieee80211_scan_cancel(local);
 748
 749         /*
 750          * Stop TX on this interface first.
 751          */
 752         if (sdata->dev)
 753                 netif_tx_stop_all_queues(sdata->dev);
 754
 755         ieee80211_roc_purge(local, sdata);
 756
 757         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 758                 ieee80211_mgd_stop(sdata);
 759
 760         /*
 761          * Remove all stations associated with this interface.
 762          *
 763          * This must be done before calling ops->remove_interface()
 764          * because otherwise we can later invoke ops->sta_notify()
 765          * whenever the STAs are removed, and that invalidates driver
 766          * assumptions about always getting a vif pointer that is valid
 767          * (because if we remove a STA after ops->remove_interface()
 768          * the driver will have removed the vif info already!)
 769          *
 770          * This is relevant only in WDS mode, in all other modes we've
 771          * already removed all stations when disconnecting or similar,
 772          * so warn otherwise.
 773          *
 774          * We call sta_info_flush_cleanup() later, to combine RCU waits.
 775          */
 776         flushed = sta_info_flush_defer(sdata);
 777         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 778                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
 779
 780         /* don't count this interface for promisc/allmulti while it is down */
 781         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 782                 atomic_dec(&local->iff_allmultis);
 783
 784         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 785                 atomic_dec(&local->iff_promiscs);
 786
 787         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 788                 local->fif_pspoll--;
 789                 local->fif_probe_req--;
 790         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 791                 local->fif_probe_req--;
 792         }
 793
 794         if (sdata->dev) {
 795                 netif_addr_lock_bh(sdata->dev);
 796                 spin_lock_bh(&local->filter_lock);
 797                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 798                                  sdata->dev->addr_len);
 799                 spin_unlock_bh(&local->filter_lock);
 800                 netif_addr_unlock_bh(sdata->dev);
 801         }
 802
 803         del_timer_sync(&local->dynamic_ps_timer);
 804         cancel_work_sync(&local->dynamic_ps_enable_work);
 805
 806         cancel_work_sync(&sdata->recalc_smps);
 807
 808         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 809
 810         if (sdata->wdev.cac_started) {
 811                 WARN_ON(local->suspended);
 812                 mutex_lock(&local->iflist_mtx);
 813                 ieee80211_vif_release_channel(sdata);
 814                 mutex_unlock(&local->iflist_mtx);
 815                 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
 816                                    GFP_KERNEL);
 817         }
 818
 819         /* APs need special treatment */
 820         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 821                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 822
 823                 /* down all dependent devices, that is VLANs */
 824                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 825                                          u.vlan.list)
 826                         dev_close(vlan->dev);
 827                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 828         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 829                 /* remove all packets in parent bc_buf pointing to this dev */
 830                 ps = &sdata->bss->ps;
 831
 832                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 833                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 834                         if (skb->dev == sdata->dev) {
 835                                 __skb_unlink(skb, &ps->bc_buf);
 836                                 local->total_ps_buffered--;
 837                                 ieee80211_free_txskb(&local->hw, skb);
 838                         }
 839                 }
 840                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 841         }
 842
 843         if (going_down)
 844                 local->open_count--;
 845
 846         switch (sdata->vif.type) {
 847         case NL80211_IFTYPE_AP_VLAN:
 848                 list_del(&sdata->u.vlan.list);
 849                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
 850                 /* no need to tell driver */
 851                 break;
 852         case NL80211_IFTYPE_MONITOR:
 853                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 854                         local->cooked_mntrs--;
 855                         break;
 856                 }
 857
 858                 local->monitors--;
 859                 if (local->monitors == 0) {
 860                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 861                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 862                 }
 863
 864                 ieee80211_adjust_monitor_flags(sdata, -1);
 865                 break;
 866         case NL80211_IFTYPE_P2P_DEVICE:
 867                 /* relies on synchronize_rcu() below */
 868                 rcu_assign_pointer(local->p2p_sdata, NULL);
 869                 /* fall through */
 870         default:
 871                 cancel_work_sync(&sdata->work);
 872                 /*
 873                  * When we get here, the interface is marked down.
 874                  *
 875                  * sta_info_flush_cleanup() requires rcu_barrier()
 876                  * first to wait for the station call_rcu() calls
 877                  * to complete, and we also need synchronize_rcu()
 878                  * to wait for the RX path in case it is using the
 879                  * interface and enqueuing frames at this very time on
 880                  * another CPU.
 881                  */
 882                 synchronize_rcu();
 883                 rcu_barrier();
 884                 sta_info_flush_cleanup(sdata);
 885
 886                 /*
 887                  * Free all remaining keys, there shouldn't be any,
 888                  * except maybe in WDS mode?
 889                  */
 890                 ieee80211_free_keys(sdata);
 891
 892                 /* fall through */
 893         case NL80211_IFTYPE_AP:
 894                 skb_queue_purge(&sdata->skb_queue);
 895         }
 896
 897         sdata->bss = NULL;
 898
 899         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 900         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 901                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 902                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 903                         if (info->control.vif == &sdata->vif) {
 904                                 __skb_unlink(skb, &local->pending[i]);
 905                                 ieee80211_free_txskb(&local->hw, skb);
 906                         }
 907                 }
 908         }
 909         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 910
 911         if (local->open_count == 0)
 912                 ieee80211_clear_tx_pending(local);
 913
 914         /*
 915          * If the interface goes down while suspended, presumably because
 916          * the device was unplugged and that happens before our resume,
 917          * then the driver is already unconfigured and the remainder of
 918          * this function isn't needed.
 919          * XXX: what about WoWLAN? If the device has software state, e.g.
 920          *      memory allocated, it might expect teardown commands from
 921          *      mac80211 here?
 922          */
 923         if (local->suspended) {
 924                 WARN_ON(local->wowlan);
 925                 WARN_ON(rtnl_dereference(local->monitor_sdata));
 926                 return;
 927         }
 928
 929         switch (sdata->vif.type) {
 930         case NL80211_IFTYPE_AP_VLAN:
 931                 break;
 932         case NL80211_IFTYPE_MONITOR:
 933                 if (local->monitors == 0)
 934                         ieee80211_del_virtual_monitor(local);
 935
 936                 mutex_lock(&local->mtx);
 937                 ieee80211_recalc_idle(local);
 938                 mutex_unlock(&local->mtx);
 939
 940                 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 941                         break;
 942
 943                 /* fall through */
 944         default:
 945                 if (going_down)
 946                         drv_remove_interface(local, sdata);
 947         }
 948
 949         ieee80211_recalc_ps(local, -1);
 950
 951         if (local->open_count == 0) {
 952                 ieee80211_stop_device(local);
 953
 954                 /* no reconfiguring after stop! */
 955                 return;
 956         }
 957
 958         /* do after stop to avoid reconfiguring when we stop anyway */
 959         ieee80211_configure_filter(local);
 960         ieee80211_hw_config(local, hw_reconf_flags);
 961
 962         if (local->monitors == local->open_count)
 963                 ieee80211_add_virtual_monitor(local);
 964 }
 965
 966 static int ieee80211_stop(struct net_device *dev)
 967 {
 968         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 969
 970         ieee80211_do_stop(sdata, true);
 971
 972         return 0;
 973 }
 974
 975 static void ieee80211_set_multicast_list(struct net_device *dev)
 976 {
 977         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 978         struct ieee80211_local *local = sdata->local;
 979         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 980
 981         allmulti = !!(dev->flags & IFF_ALLMULTI);
 982         promisc = !!(dev->flags & IFF_PROMISC);
 983         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 984         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 985
 986         if (allmulti != sdata_allmulti) {
 987                 if (dev->flags & IFF_ALLMULTI)
 988                         atomic_inc(&local->iff_allmultis);
 989                 else
 990                         atomic_dec(&local->iff_allmultis);
 991                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 992         }
 993
 994         if (promisc != sdata_promisc) {
 995                 if (dev->flags & IFF_PROMISC)
 996                         atomic_inc(&local->iff_promiscs);
 997                 else
 998                         atomic_dec(&local->iff_promiscs);
 999                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1000         }
1001
1002         /*
1003          * TODO: If somebody needs this on AP interfaces,
1004          *       it can be enabled easily but multicast
1005          *       addresses from VLANs need to be synced.
1006          */
1007         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1008             sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1009             sdata->vif.type != NL80211_IFTYPE_AP)
1010                 drv_set_multicast_list(local, sdata, &dev->mc);
1011
1012         spin_lock_bh(&local->filter_lock);
1013         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1014         spin_unlock_bh(&local->filter_lock);
1015         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1016 }
1017
1018 /*
1019  * Called when the netdev is removed or, by the code below, before
1020  * the interface type changes.
1021  */
1022 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1023 {
1024         int flushed;
1025         int i;
1026
1027         /* free extra data */
1028         ieee80211_free_keys(sdata);
1029
1030         ieee80211_debugfs_remove_netdev(sdata);
1031
1032         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1033                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1034         sdata->fragment_next = 0;
1035
1036         if (ieee80211_vif_is_mesh(&sdata->vif))
1037                 mesh_rmc_free(sdata);
1038
1039         flushed = sta_info_flush(sdata);
1040         WARN_ON(flushed);
1041 }
1042
1043 static void ieee80211_uninit(struct net_device *dev)
1044 {
1045         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1046 }
1047
1048 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1049                                          struct sk_buff *skb)
1050 {
1051         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1052 }
1053
1054 static const struct net_device_ops ieee80211_dataif_ops = {
1055         .ndo_open               = ieee80211_open,
1056         .ndo_stop               = ieee80211_stop,
1057         .ndo_uninit             = ieee80211_uninit,
1058         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1059         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1060         .ndo_change_mtu         = ieee80211_change_mtu,
1061         .ndo_set_mac_address    = ieee80211_change_mac,
1062         .ndo_select_queue       = ieee80211_netdev_select_queue,
1063 };
1064
1065 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1066                                           struct sk_buff *skb)
1067 {
1068         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1069         struct ieee80211_local *local = sdata->local;
1070         struct ieee80211_hdr *hdr;
1071         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1072
1073         if (local->hw.queues < IEEE80211_NUM_ACS)
1074                 return 0;
1075
1076         if (skb->len < 4 ||
1077             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1078                 return 0; /* doesn't matter, frame will be dropped */
1079
1080         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1081
1082         return ieee80211_select_queue_80211(sdata, skb, hdr);
1083 }
1084
1085 static const struct net_device_ops ieee80211_monitorif_ops = {
1086         .ndo_open               = ieee80211_open,
1087         .ndo_stop               = ieee80211_stop,
1088         .ndo_uninit             = ieee80211_uninit,
1089         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1090         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1091         .ndo_change_mtu         = ieee80211_change_mtu,
1092         .ndo_set_mac_address    = ieee80211_change_mac,
1093         .ndo_select_queue       = ieee80211_monitor_select_queue,
1094 };
1095
1096 static void ieee80211_if_setup(struct net_device *dev)
1097 {
1098         ether_setup(dev);
1099         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1100         dev->netdev_ops = &ieee80211_dataif_ops;
1101         dev->destructor = free_netdev;
1102 }
1103
1104 static void ieee80211_iface_work(struct work_struct *work)
1105 {
1106         struct ieee80211_sub_if_data *sdata =
1107                 container_of(work, struct ieee80211_sub_if_data, work);
1108         struct ieee80211_local *local = sdata->local;
1109         struct sk_buff *skb;
1110         struct sta_info *sta;
1111         struct ieee80211_ra_tid *ra_tid;
1112
1113         if (!ieee80211_sdata_running(sdata))
1114                 return;
1115
1116         if (local->scanning)
1117                 return;
1118
1119         /*
1120          * ieee80211_queue_work() should have picked up most cases,
1121          * here we'll pick the rest.
1122          */
1123         if (WARN(local->suspended,
1124                  "interface work scheduled while going to suspend\n"))
1125                 return;
1126
1127         /* first process frames */
1128         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1129                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1130
1131                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1132                         ra_tid = (void *)&skb->cb;
1133                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1134                                                  ra_tid->tid);
1135                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1136                         ra_tid = (void *)&skb->cb;
1137                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1138                                                 ra_tid->tid);
1139                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1140                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1141                         int len = skb->len;
1142
1143                         mutex_lock(&local->sta_mtx);
1144                         sta = sta_info_get_bss(sdata, mgmt->sa);
1145                         if (sta) {
1146                                 switch (mgmt->u.action.u.addba_req.action_code) {
1147                                 case WLAN_ACTION_ADDBA_REQ:
1148                                         ieee80211_process_addba_request(
1149                                                         local, sta, mgmt, len);
1150                                         break;
1151                                 case WLAN_ACTION_ADDBA_RESP:
1152                                         ieee80211_process_addba_resp(local, sta,
1153                                                                      mgmt, len);
1154                                         break;
1155                                 case WLAN_ACTION_DELBA:
1156                                         ieee80211_process_delba(sdata, sta,
1157                                                                 mgmt, len);
1158                                         break;
1159                                 default:
1160                                         WARN_ON(1);
1161                                         break;
1162                                 }
1163                         }
1164                         mutex_unlock(&local->sta_mtx);
1165                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1166                         struct ieee80211_hdr *hdr = (void *)mgmt;
1167                         /*
1168                          * So the frame isn't mgmt, but frame_control
1169                          * is at the right place anyway, of course, so
1170                          * the if statement is correct.
1171                          *
1172                          * Warn if we have other data frame types here,
1173                          * they must not get here.
1174                          */
1175                         WARN_ON(hdr->frame_control &
1176                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1177                         WARN_ON(!(hdr->seq_ctrl &
1178                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1179                         /*
1180                          * This was a fragment of a frame, received while
1181                          * a block-ack session was active. That cannot be
1182                          * right, so terminate the session.
1183                          */
1184                         mutex_lock(&local->sta_mtx);
1185                         sta = sta_info_get_bss(sdata, mgmt->sa);
1186                         if (sta) {
1187                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1188                                                 IEEE80211_QOS_CTL_TID_MASK;
1189
1190                                 __ieee80211_stop_rx_ba_session(
1191                                         sta, tid, WLAN_BACK_RECIPIENT,
1192                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1193                                         true);
1194                         }
1195                         mutex_unlock(&local->sta_mtx);
1196                 } else switch (sdata->vif.type) {
1197                 case NL80211_IFTYPE_STATION:
1198                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1199                         break;
1200                 case NL80211_IFTYPE_ADHOC:
1201                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1202                         break;
1203                 case NL80211_IFTYPE_MESH_POINT:
1204                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1205                                 break;
1206                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1207                         break;
1208                 default:
1209                         WARN(1, "frame for unexpected interface type");
1210                         break;
1211                 }
1212
1213                 kfree_skb(skb);
1214         }
1215
1216         /* then other type-dependent work */
1217         switch (sdata->vif.type) {
1218         case NL80211_IFTYPE_STATION:
1219                 ieee80211_sta_work(sdata);
1220                 break;
1221         case NL80211_IFTYPE_ADHOC:
1222                 ieee80211_ibss_work(sdata);
1223                 break;
1224         case NL80211_IFTYPE_MESH_POINT:
1225                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1226                         break;
1227                 ieee80211_mesh_work(sdata);
1228                 break;
1229         default:
1230                 break;
1231         }
1232 }
1233
1234 static void ieee80211_recalc_smps_work(struct work_struct *work)
1235 {
1236         struct ieee80211_sub_if_data *sdata =
1237                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1238
1239         ieee80211_recalc_smps(sdata);
1240 }
1241
1242 /*
1243  * Helper function to initialise an interface to a specific type.
1244  */
1245 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1246                                   enum nl80211_iftype type)
1247 {
1248         /* clear type-dependent union */
1249         memset(&sdata->u, 0, sizeof(sdata->u));
1250
1251         /* and set some type-dependent values */
1252         sdata->vif.type = type;
1253         sdata->vif.p2p = false;
1254         sdata->wdev.iftype = type;
1255
1256         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1257         sdata->control_port_no_encrypt = false;
1258
1259         sdata->noack_map = 0;
1260
1261         /* only monitor/p2p-device differ */
1262         if (sdata->dev) {
1263                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1264                 sdata->dev->type = ARPHRD_ETHER;
1265         }
1266
1267         skb_queue_head_init(&sdata->skb_queue);
1268         INIT_WORK(&sdata->work, ieee80211_iface_work);
1269         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1270
1271         switch (type) {
1272         case NL80211_IFTYPE_P2P_GO:
1273                 type = NL80211_IFTYPE_AP;
1274                 sdata->vif.type = type;
1275                 sdata->vif.p2p = true;
1276                 /* fall through */
1277         case NL80211_IFTYPE_AP:
1278                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1279                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1280                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1281                 break;
1282         case NL80211_IFTYPE_P2P_CLIENT:
1283                 type = NL80211_IFTYPE_STATION;
1284                 sdata->vif.type = type;
1285                 sdata->vif.p2p = true;
1286                 /* fall through */
1287         case NL80211_IFTYPE_STATION:
1288                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1289                 ieee80211_sta_setup_sdata(sdata);
1290                 break;
1291         case NL80211_IFTYPE_ADHOC:
1292                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1293                 ieee80211_ibss_setup_sdata(sdata);
1294                 break;
1295         case NL80211_IFTYPE_MESH_POINT:
1296                 if (ieee80211_vif_is_mesh(&sdata->vif))
1297                         ieee80211_mesh_init_sdata(sdata);
1298                 break;
1299         case NL80211_IFTYPE_MONITOR:
1300                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1301                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1302                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1303                                       MONITOR_FLAG_OTHER_BSS;
1304                 break;
1305         case NL80211_IFTYPE_WDS:
1306                 sdata->vif.bss_conf.bssid = NULL;
1307                 break;
1308         case NL80211_IFTYPE_AP_VLAN:
1309                 break;
1310         case NL80211_IFTYPE_P2P_DEVICE:
1311                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1312                 break;
1313         case NL80211_IFTYPE_UNSPECIFIED:
1314         case NUM_NL80211_IFTYPES:
1315                 BUG();
1316                 break;
1317         }
1318
1319         ieee80211_debugfs_add_netdev(sdata);
1320 }
1321
1322 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1323                                            enum nl80211_iftype type)
1324 {
1325         struct ieee80211_local *local = sdata->local;
1326         int ret, err;
1327         enum nl80211_iftype internal_type = type;
1328         bool p2p = false;
1329
1330         ASSERT_RTNL();
1331
1332         if (!local->ops->change_interface)
1333                 return -EBUSY;
1334
1335         switch (sdata->vif.type) {
1336         case NL80211_IFTYPE_AP:
1337         case NL80211_IFTYPE_STATION:
1338         case NL80211_IFTYPE_ADHOC:
1339                 /*
1340                  * Could maybe also all others here?
1341                  * Just not sure how that interacts
1342                  * with the RX/config path e.g. for
1343                  * mesh.
1344                  */
1345                 break;
1346         default:
1347                 return -EBUSY;
1348         }
1349
1350         switch (type) {
1351         case NL80211_IFTYPE_AP:
1352         case NL80211_IFTYPE_STATION:
1353         case NL80211_IFTYPE_ADHOC:
1354                 /*
1355                  * Could probably support everything
1356                  * but WDS here (WDS do_open can fail
1357                  * under memory pressure, which this
1358                  * code isn't prepared to handle).
1359                  */
1360                 break;
1361         case NL80211_IFTYPE_P2P_CLIENT:
1362                 p2p = true;
1363                 internal_type = NL80211_IFTYPE_STATION;
1364                 break;
1365         case NL80211_IFTYPE_P2P_GO:
1366                 p2p = true;
1367                 internal_type = NL80211_IFTYPE_AP;
1368                 break;
1369         default:
1370                 return -EBUSY;
1371         }
1372
1373         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1374         if (ret)
1375                 return ret;
1376
1377         ieee80211_do_stop(sdata, false);
1378
1379         ieee80211_teardown_sdata(sdata);
1380
1381         ret = drv_change_interface(local, sdata, internal_type, p2p);
1382         if (ret)
1383                 type = sdata->vif.type;
1384
1385         /*
1386          * Ignore return value here, there's not much we can do since
1387          * the driver changed the interface type internally already.
1388          * The warnings will hopefully make driver authors fix it :-)
1389          */
1390         ieee80211_check_queues(sdata);
1391
1392         ieee80211_setup_sdata(sdata, type);
1393
1394         err = ieee80211_do_open(&sdata->wdev, false);
1395         WARN(err, "type change: do_open returned %d", err);
1396
1397         return ret;
1398 }
1399
1400 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1401                              enum nl80211_iftype type)
1402 {
1403         int ret;
1404
1405         ASSERT_RTNL();
1406
1407         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1408                 return 0;
1409
1410         if (ieee80211_sdata_running(sdata)) {
1411                 ret = ieee80211_runtime_change_iftype(sdata, type);
1412                 if (ret)
1413                         return ret;
1414         } else {
1415                 /* Purge and reset type-dependent state. */
1416                 ieee80211_teardown_sdata(sdata);
1417                 ieee80211_setup_sdata(sdata, type);
1418         }
1419
1420         /* reset some values that shouldn't be kept across type changes */
1421         sdata->drop_unencrypted = 0;
1422         if (type == NL80211_IFTYPE_STATION)
1423                 sdata->u.mgd.use_4addr = false;
1424
1425         return 0;
1426 }
1427
1428 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1429                                        u8 *perm_addr, enum nl80211_iftype type)
1430 {
1431         struct ieee80211_sub_if_data *sdata;
1432         u64 mask, start, addr, val, inc;
1433         u8 *m;
1434         u8 tmp_addr[ETH_ALEN];
1435         int i;
1436
1437         /* default ... something at least */
1438         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1439
1440         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1441             local->hw.wiphy->n_addresses <= 1)
1442                 return;
1443
1444         mutex_lock(&local->iflist_mtx);
1445
1446         switch (type) {
1447         case NL80211_IFTYPE_MONITOR:
1448                 /* doesn't matter */
1449                 break;
1450         case NL80211_IFTYPE_WDS:
1451         case NL80211_IFTYPE_AP_VLAN:
1452                 /* match up with an AP interface */
1453                 list_for_each_entry(sdata, &local->interfaces, list) {
1454                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1455                                 continue;
1456                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1457                         break;
1458                 }
1459                 /* keep default if no AP interface present */
1460                 break;
1461         case NL80211_IFTYPE_P2P_CLIENT:
1462         case NL80211_IFTYPE_P2P_GO:
1463                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1464                         list_for_each_entry(sdata, &local->interfaces, list) {
1465                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1466                                         continue;
1467                                 if (!ieee80211_sdata_running(sdata))
1468                                         continue;
1469                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1470                                 goto out_unlock;
1471                         }
1472                 }
1473                 /* otherwise fall through */
1474         default:
1475                 /* assign a new address if possible -- try n_addresses first */
1476                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1477                         bool used = false;
1478
1479                         list_for_each_entry(sdata, &local->interfaces, list) {
1480                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1481                                            sdata->vif.addr, ETH_ALEN) == 0) {
1482                                         used = true;
1483                                         break;
1484                                 }
1485                         }
1486
1487                         if (!used) {
1488                                 memcpy(perm_addr,
1489                                        local->hw.wiphy->addresses[i].addr,
1490                                        ETH_ALEN);
1491                                 break;
1492                         }
1493                 }
1494
1495                 /* try mask if available */
1496                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1497                         break;
1498
1499                 m = local->hw.wiphy->addr_mask;
1500                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1501                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1502                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1503
1504                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1505                         /* not a contiguous mask ... not handled now! */
1506                         pr_info("not contiguous\n");
1507                         break;
1508                 }
1509
1510                 /*
1511                  * Pick address of existing interface in case user changed
1512                  * MAC address manually, default to perm_addr.
1513                  */
1514                 m = local->hw.wiphy->perm_addr;
1515                 list_for_each_entry(sdata, &local->interfaces, list) {
1516                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1517                                 continue;
1518                         m = sdata->vif.addr;
1519                         break;
1520                 }
1521                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1522                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1523                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1524
1525                 inc = 1ULL<<__ffs64(mask);
1526                 val = (start & mask);
1527                 addr = (start & ~mask) | (val & mask);
1528                 do {
1529                         bool used = false;
1530
1531                         tmp_addr[5] = addr >> 0*8;
1532                         tmp_addr[4] = addr >> 1*8;
1533                         tmp_addr[3] = addr >> 2*8;
1534                         tmp_addr[2] = addr >> 3*8;
1535                         tmp_addr[1] = addr >> 4*8;
1536                         tmp_addr[0] = addr >> 5*8;
1537
1538                         val += inc;
1539
1540                         list_for_each_entry(sdata, &local->interfaces, list) {
1541                                 if (memcmp(tmp_addr, sdata->vif.addr,
1542                                                         ETH_ALEN) == 0) {
1543                                         used = true;
1544                                         break;
1545                                 }
1546                         }
1547
1548                         if (!used) {
1549                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1550                                 break;
1551                         }
1552                         addr = (start & ~mask) | (val & mask);
1553                 } while (addr != start);
1554
1555                 break;
1556         }
1557
1558  out_unlock:
1559         mutex_unlock(&local->iflist_mtx);
1560 }
1561
1562 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1563 {
1564         struct ieee80211_sub_if_data *sdata;
1565
1566         sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1567
1568         ieee80211_cleanup_sdata_stas(sdata);
1569 }
1570
1571 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1572                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1573                      struct vif_params *params)
1574 {
1575         struct net_device *ndev = NULL;
1576         struct ieee80211_sub_if_data *sdata = NULL;
1577         int ret, i;
1578         int txqs = 1;
1579
1580         ASSERT_RTNL();
1581
1582         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1583                 struct wireless_dev *wdev;
1584
1585                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1586                                 GFP_KERNEL);
1587                 if (!sdata)
1588                         return -ENOMEM;
1589                 wdev = &sdata->wdev;
1590
1591                 sdata->dev = NULL;
1592                 strlcpy(sdata->name, name, IFNAMSIZ);
1593                 ieee80211_assign_perm_addr(local, wdev->address, type);
1594                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1595         } else {
1596                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1597                         txqs = IEEE80211_NUM_ACS;
1598
1599                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1600                                         local->hw.vif_data_size,
1601                                         name, ieee80211_if_setup, txqs, 1);
1602                 if (!ndev)
1603                         return -ENOMEM;
1604                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1605
1606                 ndev->needed_headroom = local->tx_headroom +
1607                                         4*6 /* four MAC addresses */
1608                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1609                                         + 6 /* mesh */
1610                                         + 8 /* rfc1042/bridge tunnel */
1611                                         - ETH_HLEN /* ethernet hard_header_len */
1612                                         + IEEE80211_ENCRYPT_HEADROOM;
1613                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1614
1615                 ret = dev_alloc_name(ndev, ndev->name);
1616                 if (ret < 0) {
1617                         free_netdev(ndev);
1618                         return ret;
1619                 }
1620
1621                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1622                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1623                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1624
1625                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1626                 sdata = netdev_priv(ndev);
1627                 ndev->ieee80211_ptr = &sdata->wdev;
1628                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1629                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1630
1631                 sdata->dev = ndev;
1632         }
1633
1634         /* initialise type-independent data */
1635         sdata->wdev.wiphy = local->hw.wiphy;
1636         sdata->local = local;
1637
1638         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1639                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1640
1641         INIT_LIST_HEAD(&sdata->key_list);
1642
1643         spin_lock_init(&sdata->cleanup_stations_lock);
1644         INIT_LIST_HEAD(&sdata->cleanup_stations);
1645         INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1646         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1647                           ieee80211_dfs_cac_timer_work);
1648         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1649                           ieee80211_delayed_tailroom_dec);
1650
1651         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1652                 struct ieee80211_supported_band *sband;
1653                 sband = local->hw.wiphy->bands[i];
1654                 sdata->rc_rateidx_mask[i] =
1655                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1656                 if (sband)
1657                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1658                                sband->ht_cap.mcs.rx_mask,
1659                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1660                 else
1661                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1662                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1663         }
1664
1665         ieee80211_set_default_queues(sdata);
1666
1667         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1668         sdata->user_power_level = local->user_power_level;
1669
1670         /* setup type-dependent data */
1671         ieee80211_setup_sdata(sdata, type);
1672
1673         if (ndev) {
1674                 if (params) {
1675                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1676                         if (type == NL80211_IFTYPE_STATION)
1677                                 sdata->u.mgd.use_4addr = params->use_4addr;
1678                 }
1679
1680                 ndev->features |= local->hw.netdev_features;
1681
1682                 ret = register_netdevice(ndev);
1683                 if (ret) {
1684                         free_netdev(ndev);
1685                         return ret;
1686                 }
1687         }
1688
1689         mutex_lock(&local->iflist_mtx);
1690         list_add_tail_rcu(&sdata->list, &local->interfaces);
1691         mutex_unlock(&local->iflist_mtx);
1692
1693         if (new_wdev)
1694                 *new_wdev = &sdata->wdev;
1695
1696         return 0;
1697 }
1698
1699 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1700 {
1701         ASSERT_RTNL();
1702
1703         mutex_lock(&sdata->local->iflist_mtx);
1704         list_del_rcu(&sdata->list);
1705         mutex_unlock(&sdata->local->iflist_mtx);
1706
1707         synchronize_rcu();
1708
1709         if (sdata->dev) {
1710                 unregister_netdevice(sdata->dev);
1711         } else {
1712                 cfg80211_unregister_wdev(&sdata->wdev);
1713                 kfree(sdata);
1714         }
1715 }
1716
1717 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1718 {
1719         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1720                 return;
1721         ieee80211_do_stop(sdata, true);
1722         ieee80211_teardown_sdata(sdata);
1723 }
1724
1725 /*
1726  * Remove all interfaces, may only be called at hardware unregistration
1727  * time because it doesn't do RCU-safe list removals.
1728  */
1729 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1730 {
1731         struct ieee80211_sub_if_data *sdata, *tmp;
1732         LIST_HEAD(unreg_list);
1733         LIST_HEAD(wdev_list);
1734
1735         ASSERT_RTNL();
1736
1737         /*
1738          * Close all AP_VLAN interfaces first, as otherwise they
1739          * might be closed while the AP interface they belong to
1740          * is closed, causing unregister_netdevice_many() to crash.
1741          */
1742         list_for_each_entry(sdata, &local->interfaces, list)
1743                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1744                         dev_close(sdata->dev);
1745
1746         mutex_lock(&local->iflist_mtx);
1747         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1748                 list_del(&sdata->list);
1749
1750                 if (sdata->dev)
1751                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1752                 else
1753                         list_add(&sdata->list, &wdev_list);
1754         }
1755         mutex_unlock(&local->iflist_mtx);
1756         unregister_netdevice_many(&unreg_list);
1757         list_del(&unreg_list);
1758
1759         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1760                 list_del(&sdata->list);
1761                 cfg80211_unregister_wdev(&sdata->wdev);
1762                 kfree(sdata);
1763         }
1764 }
1765
1766 static int netdev_notify(struct notifier_block *nb,
1767                          unsigned long state, void *ptr)
1768 {
1769         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1770         struct ieee80211_sub_if_data *sdata;
1771
1772         if (state != NETDEV_CHANGENAME)
1773                 return 0;
1774
1775         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1776                 return 0;
1777
1778         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1779                 return 0;
1780
1781         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1782
1783         memcpy(sdata->name, dev->name, IFNAMSIZ);
1784
1785         ieee80211_debugfs_rename_netdev(sdata);
1786         return 0;
1787 }
1788
1789 static struct notifier_block mac80211_netdev_notifier = {
1790         .notifier_call = netdev_notify,
1791 };
1792
1793 int ieee80211_iface_init(void)
1794 {
1795         return register_netdevice_notifier(&mac80211_netdev_notifier);
1796 }
1797
1798 void ieee80211_iface_exit(void)
1799 {
1800         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1801 }