Pileus Git - ~andy/linux/blob - net/mac80211/iface.c

   1 /*
   2  * Interface handling (except master interface)
   3  *
   4  * Copyright 2002-2005, Instant802 Networks, Inc.
   5  * Copyright 2005-2006, Devicescape Software, Inc.
   6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/if_arp.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/rtnetlink.h>
  18 #include <net/mac80211.h>
  19 #include <net/ieee80211_radiotap.h>
  20 #include "ieee80211_i.h"
  21 #include "sta_info.h"
  22 #include "debugfs_netdev.h"
  23 #include "mesh.h"
  24 #include "led.h"
  25 #include "driver-ops.h"
  26 #include "wme.h"
  27 #include "rate.h"
  28
  29 /**
  30  * DOC: Interface list locking
  31  *
  32  * The interface list in each struct ieee80211_local is protected
  33  * three-fold:
  34  *
  35  * (1) modifications may only be done under the RTNL
  36  * (2) modifications and readers are protected against each other by
  37  *     the iflist_mtx.
  38  * (3) modifications are done in an RCU manner so atomic readers
  39  *     can traverse the list in RCU-safe blocks.
  40  *
  41  * As a consequence, reads (traversals) of the list can be protected
  42  * by either the RTNL, the iflist_mtx or RCU.
  43  */
  44
  45 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  46 {
  47         struct ieee80211_chanctx_conf *chanctx_conf;
  48         int power;
  49
  50         rcu_read_lock();
  51         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  52         if (!chanctx_conf) {
  53                 rcu_read_unlock();
  54                 return false;
  55         }
  56
  57         power = chanctx_conf->def.chan->max_power;
  58         rcu_read_unlock();
  59
  60         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  61                 power = min(power, sdata->user_power_level);
  62
  63         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  64                 power = min(power, sdata->ap_power_level);
  65
  66         if (power != sdata->vif.bss_conf.txpower) {
  67                 sdata->vif.bss_conf.txpower = power;
  68                 ieee80211_hw_config(sdata->local, 0);
  69                 return true;
  70         }
  71
  72         return false;
  73 }
  74
  75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  76 {
  77         if (__ieee80211_recalc_txpower(sdata))
  78                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  79 }
  80
  81 static u32 ieee80211_idle_off(struct ieee80211_local *local)
  82 {
  83         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  84                 return 0;
  85
  86         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  87         return IEEE80211_CONF_CHANGE_IDLE;
  88 }
  89
  90 static u32 ieee80211_idle_on(struct ieee80211_local *local)
  91 {
  92         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  93                 return 0;
  94
  95         drv_flush(local, false);
  96
  97         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
  98         return IEEE80211_CONF_CHANGE_IDLE;
  99 }
 100
 101 void ieee80211_recalc_idle(struct ieee80211_local *local)
 102 {
 103         bool working = false, scanning, active;
 104         unsigned int led_trig_start = 0, led_trig_stop = 0;
 105         struct ieee80211_roc_work *roc;
 106         u32 change;
 107
 108         lockdep_assert_held(&local->mtx);
 109
 110         active = !list_empty(&local->chanctx_list) || local->monitors;
 111
 112         if (!local->ops->remain_on_channel) {
 113                 list_for_each_entry(roc, &local->roc_list, list) {
 114                         working = true;
 115                         break;
 116                 }
 117         }
 118
 119         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 120                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 121
 122         if (working || scanning)
 123                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 124         else
 125                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 126
 127         if (active)
 128                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 129         else
 130                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 131
 132         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 133
 134         if (working || scanning || active)
 135                 change = ieee80211_idle_off(local);
 136         else
 137                 change = ieee80211_idle_on(local);
 138         if (change)
 139                 ieee80211_hw_config(local, change);
 140 }
 141
 142 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 143 {
 144         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
 145                 return -EINVAL;
 146
 147         dev->mtu = new_mtu;
 148         return 0;
 149 }
 150
 151 static int ieee80211_verify_mac(struct ieee80211_local *local, u8 *addr)
 152 {
 153         struct ieee80211_sub_if_data *sdata;
 154         u64 new, mask, tmp;
 155         u8 *m;
 156         int ret = 0;
 157
 158         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 159                 return 0;
 160
 161         m = addr;
 162         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 163                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 164                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 165
 166         m = local->hw.wiphy->addr_mask;
 167         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 168                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 169                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 170
 171
 172         mutex_lock(&local->iflist_mtx);
 173         list_for_each_entry(sdata, &local->interfaces, list) {
 174                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
 175                         continue;
 176
 177                 m = sdata->vif.addr;
 178                 tmp =   ((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                 if ((new & ~mask) != (tmp & ~mask)) {
 183                         ret = -EINVAL;
 184                         break;
 185                 }
 186         }
 187         mutex_unlock(&local->iflist_mtx);
 188
 189         return ret;
 190 }
 191
 192 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 193 {
 194         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 195         struct sockaddr *sa = addr;
 196         int ret;
 197
 198         if (ieee80211_sdata_running(sdata))
 199                 return -EBUSY;
 200
 201         ret = ieee80211_verify_mac(sdata->local, sa->sa_data);
 202         if (ret)
 203                 return ret;
 204
 205         ret = eth_mac_addr(dev, sa);
 206
 207         if (ret == 0)
 208                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 209
 210         return ret;
 211 }
 212
 213 static inline int identical_mac_addr_allowed(int type1, int type2)
 214 {
 215         return type1 == NL80211_IFTYPE_MONITOR ||
 216                 type2 == NL80211_IFTYPE_MONITOR ||
 217                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 218                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 219                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 220                 (type1 == NL80211_IFTYPE_WDS &&
 221                         (type2 == NL80211_IFTYPE_WDS ||
 222                          type2 == NL80211_IFTYPE_AP)) ||
 223                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 224                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 225                         (type2 == NL80211_IFTYPE_AP ||
 226                          type2 == NL80211_IFTYPE_AP_VLAN));
 227 }
 228
 229 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 230                                             enum nl80211_iftype iftype)
 231 {
 232         struct ieee80211_local *local = sdata->local;
 233         struct ieee80211_sub_if_data *nsdata;
 234
 235         ASSERT_RTNL();
 236
 237         /* we hold the RTNL here so can safely walk the list */
 238         list_for_each_entry(nsdata, &local->interfaces, list) {
 239                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 240                         /*
 241                          * Allow only a single IBSS interface to be up at any
 242                          * time. This is restricted because beacon distribution
 243                          * cannot work properly if both are in the same IBSS.
 244                          *
 245                          * To remove this restriction we'd have to disallow them
 246                          * from setting the same SSID on different IBSS interfaces
 247                          * belonging to the same hardware. Then, however, we're
 248                          * faced with having to adopt two different TSF timers...
 249                          */
 250                         if (iftype == NL80211_IFTYPE_ADHOC &&
 251                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 252                                 return -EBUSY;
 253
 254                         /*
 255                          * The remaining checks are only performed for interfaces
 256                          * with the same MAC address.
 257                          */
 258                         if (!ether_addr_equal(sdata->vif.addr,
 259                                               nsdata->vif.addr))
 260                                 continue;
 261
 262                         /*
 263                          * check whether it may have the same address
 264                          */
 265                         if (!identical_mac_addr_allowed(iftype,
 266                                                         nsdata->vif.type))
 267                                 return -ENOTUNIQ;
 268
 269                         /*
 270                          * can only add VLANs to enabled APs
 271                          */
 272                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 273                             nsdata->vif.type == NL80211_IFTYPE_AP)
 274                                 sdata->bss = &nsdata->u.ap;
 275                 }
 276         }
 277
 278         return 0;
 279 }
 280
 281 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
 282 {
 283         int n_queues = sdata->local->hw.queues;
 284         int i;
 285
 286         if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
 287                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 288                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 289                                          IEEE80211_INVAL_HW_QUEUE))
 290                                 return -EINVAL;
 291                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 292                                          n_queues))
 293                                 return -EINVAL;
 294                 }
 295         }
 296
 297         if ((sdata->vif.type != NL80211_IFTYPE_AP &&
 298              sdata->vif.type != NL80211_IFTYPE_MESH_POINT) ||
 299             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
 300                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 301                 return 0;
 302         }
 303
 304         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 305                 return -EINVAL;
 306
 307         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 308                 return -EINVAL;
 309
 310         return 0;
 311 }
 312
 313 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 314                                     const int offset)
 315 {
 316         struct ieee80211_local *local = sdata->local;
 317         u32 flags = sdata->u.mntr_flags;
 318
 319 #define ADJUST(_f, _s)  do {                                    \
 320         if (flags & MONITOR_FLAG_##_f)                          \
 321                 local->fif_##_s += offset;                      \
 322         } while (0)
 323
 324         ADJUST(FCSFAIL, fcsfail);
 325         ADJUST(PLCPFAIL, plcpfail);
 326         ADJUST(CONTROL, control);
 327         ADJUST(CONTROL, pspoll);
 328         ADJUST(OTHER_BSS, other_bss);
 329
 330 #undef ADJUST
 331 }
 332
 333 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 334 {
 335         struct ieee80211_local *local = sdata->local;
 336         int i;
 337
 338         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 339                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
 340                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 341                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 342                         sdata->vif.hw_queue[i] = i;
 343                 else
 344                         sdata->vif.hw_queue[i] = 0;
 345         }
 346         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 347 }
 348
 349 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 350 {
 351         struct ieee80211_sub_if_data *sdata;
 352         int ret = 0;
 353
 354         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 355                 return 0;
 356
 357         mutex_lock(&local->iflist_mtx);
 358
 359         if (local->monitor_sdata)
 360                 goto out_unlock;
 361
 362         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 363         if (!sdata) {
 364                 ret = -ENOMEM;
 365                 goto out_unlock;
 366         }
 367
 368         /* set up data */
 369         sdata->local = local;
 370         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 371         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 372                  wiphy_name(local->hw.wiphy));
 373
 374         ieee80211_set_default_queues(sdata);
 375
 376         ret = drv_add_interface(local, sdata);
 377         if (WARN_ON(ret)) {
 378                 /* ok .. stupid driver, it asked for this! */
 379                 kfree(sdata);
 380                 goto out_unlock;
 381         }
 382
 383         ret = ieee80211_check_queues(sdata);
 384         if (ret) {
 385                 kfree(sdata);
 386                 goto out_unlock;
 387         }
 388
 389         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 390                                         IEEE80211_CHANCTX_EXCLUSIVE);
 391         if (ret) {
 392                 drv_remove_interface(local, sdata);
 393                 kfree(sdata);
 394                 goto out_unlock;
 395         }
 396
 397         rcu_assign_pointer(local->monitor_sdata, sdata);
 398  out_unlock:
 399         mutex_unlock(&local->iflist_mtx);
 400         return ret;
 401 }
 402
 403 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 404 {
 405         struct ieee80211_sub_if_data *sdata;
 406
 407         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 408                 return;
 409
 410         mutex_lock(&local->iflist_mtx);
 411
 412         sdata = rcu_dereference_protected(local->monitor_sdata,
 413                                           lockdep_is_held(&local->iflist_mtx));
 414         if (!sdata)
 415                 goto out_unlock;
 416
 417         rcu_assign_pointer(local->monitor_sdata, NULL);
 418         synchronize_net();
 419
 420         ieee80211_vif_release_channel(sdata);
 421
 422         drv_remove_interface(local, sdata);
 423
 424         kfree(sdata);
 425  out_unlock:
 426         mutex_unlock(&local->iflist_mtx);
 427 }
 428
 429 /*
 430  * NOTE: Be very careful when changing this function, it must NOT return
 431  * an error on interface type changes that have been pre-checked, so most
 432  * checks should be in ieee80211_check_concurrent_iface.
 433  */
 434 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 435 {
 436         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 437         struct net_device *dev = wdev->netdev;
 438         struct ieee80211_local *local = sdata->local;
 439         struct sta_info *sta;
 440         u32 changed = 0;
 441         int res;
 442         u32 hw_reconf_flags = 0;
 443
 444         switch (sdata->vif.type) {
 445         case NL80211_IFTYPE_WDS:
 446                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 447                         return -ENOLINK;
 448                 break;
 449         case NL80211_IFTYPE_AP_VLAN: {
 450                 struct ieee80211_sub_if_data *master;
 451
 452                 if (!sdata->bss)
 453                         return -ENOLINK;
 454
 455                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 456
 457                 master = container_of(sdata->bss,
 458                                       struct ieee80211_sub_if_data, u.ap);
 459                 sdata->control_port_protocol =
 460                         master->control_port_protocol;
 461                 sdata->control_port_no_encrypt =
 462                         master->control_port_no_encrypt;
 463                 break;
 464                 }
 465         case NL80211_IFTYPE_AP:
 466                 sdata->bss = &sdata->u.ap;
 467                 break;
 468         case NL80211_IFTYPE_MESH_POINT:
 469         case NL80211_IFTYPE_STATION:
 470         case NL80211_IFTYPE_MONITOR:
 471         case NL80211_IFTYPE_ADHOC:
 472         case NL80211_IFTYPE_P2P_DEVICE:
 473                 /* no special treatment */
 474                 break;
 475         case NL80211_IFTYPE_UNSPECIFIED:
 476         case NUM_NL80211_IFTYPES:
 477         case NL80211_IFTYPE_P2P_CLIENT:
 478         case NL80211_IFTYPE_P2P_GO:
 479                 /* cannot happen */
 480                 WARN_ON(1);
 481                 break;
 482         }
 483
 484         if (local->open_count == 0) {
 485                 res = drv_start(local);
 486                 if (res)
 487                         goto err_del_bss;
 488                 /* we're brought up, everything changes */
 489                 hw_reconf_flags = ~0;
 490                 ieee80211_led_radio(local, true);
 491                 ieee80211_mod_tpt_led_trig(local,
 492                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 493         }
 494
 495         /*
 496          * Copy the hopefully now-present MAC address to
 497          * this interface, if it has the special null one.
 498          */
 499         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 500                 memcpy(dev->dev_addr,
 501                        local->hw.wiphy->perm_addr,
 502                        ETH_ALEN);
 503                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 504
 505                 if (!is_valid_ether_addr(dev->dev_addr)) {
 506                         res = -EADDRNOTAVAIL;
 507                         goto err_stop;
 508                 }
 509         }
 510
 511         switch (sdata->vif.type) {
 512         case NL80211_IFTYPE_AP_VLAN:
 513                 /* no need to tell driver, but set carrier and chanctx */
 514                 if (rtnl_dereference(sdata->bss->beacon)) {
 515                         ieee80211_vif_vlan_copy_chanctx(sdata);
 516                         netif_carrier_on(dev);
 517                 } else {
 518                         netif_carrier_off(dev);
 519                 }
 520                 break;
 521         case NL80211_IFTYPE_MONITOR:
 522                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 523                         local->cooked_mntrs++;
 524                         break;
 525                 }
 526
 527                 if (local->monitors == 0 && local->open_count == 0) {
 528                         res = ieee80211_add_virtual_monitor(local);
 529                         if (res)
 530                                 goto err_stop;
 531                 }
 532
 533                 /* must be before the call to ieee80211_configure_filter */
 534                 local->monitors++;
 535                 if (local->monitors == 1) {
 536                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 537                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 538                 }
 539
 540                 ieee80211_adjust_monitor_flags(sdata, 1);
 541                 ieee80211_configure_filter(local);
 542                 mutex_lock(&local->mtx);
 543                 ieee80211_recalc_idle(local);
 544                 mutex_unlock(&local->mtx);
 545
 546                 netif_carrier_on(dev);
 547                 break;
 548         default:
 549                 if (coming_up) {
 550                         ieee80211_del_virtual_monitor(local);
 551
 552                         res = drv_add_interface(local, sdata);
 553                         if (res)
 554                                 goto err_stop;
 555                         res = ieee80211_check_queues(sdata);
 556                         if (res)
 557                                 goto err_del_interface;
 558                 }
 559
 560                 drv_add_interface_debugfs(local, sdata);
 561
 562                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 563                         local->fif_pspoll++;
 564                         local->fif_probe_req++;
 565
 566                         ieee80211_configure_filter(local);
 567                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 568                         local->fif_probe_req++;
 569                 }
 570
 571                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 572                         changed |= ieee80211_reset_erp_info(sdata);
 573                 ieee80211_bss_info_change_notify(sdata, changed);
 574
 575                 switch (sdata->vif.type) {
 576                 case NL80211_IFTYPE_STATION:
 577                 case NL80211_IFTYPE_ADHOC:
 578                 case NL80211_IFTYPE_AP:
 579                 case NL80211_IFTYPE_MESH_POINT:
 580                         netif_carrier_off(dev);
 581                         break;
 582                 case NL80211_IFTYPE_WDS:
 583                 case NL80211_IFTYPE_P2P_DEVICE:
 584                         break;
 585                 default:
 586                         netif_carrier_on(dev);
 587                 }
 588
 589                 /*
 590                  * set default queue parameters so drivers don't
 591                  * need to initialise the hardware if the hardware
 592                  * doesn't start up with sane defaults
 593                  */
 594                 ieee80211_set_wmm_default(sdata, true);
 595         }
 596
 597         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 598
 599         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 600                 /* Create STA entry for the WDS peer */
 601                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 602                                      GFP_KERNEL);
 603                 if (!sta) {
 604                         res = -ENOMEM;
 605                         goto err_del_interface;
 606                 }
 607
 608                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 609                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 610                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 611
 612                 res = sta_info_insert(sta);
 613                 if (res) {
 614                         /* STA has been freed */
 615                         goto err_del_interface;
 616                 }
 617
 618                 rate_control_rate_init(sta);
 619                 netif_carrier_on(dev);
 620         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 621                 rcu_assign_pointer(local->p2p_sdata, sdata);
 622         }
 623
 624         /*
 625          * set_multicast_list will be invoked by the networking core
 626          * which will check whether any increments here were done in
 627          * error and sync them down to the hardware as filter flags.
 628          */
 629         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 630                 atomic_inc(&local->iff_allmultis);
 631
 632         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 633                 atomic_inc(&local->iff_promiscs);
 634
 635         if (coming_up)
 636                 local->open_count++;
 637
 638         if (hw_reconf_flags)
 639                 ieee80211_hw_config(local, hw_reconf_flags);
 640
 641         ieee80211_recalc_ps(local, -1);
 642
 643         if (dev)
 644                 netif_tx_start_all_queues(dev);
 645
 646         return 0;
 647  err_del_interface:
 648         drv_remove_interface(local, sdata);
 649  err_stop:
 650         if (!local->open_count)
 651                 drv_stop(local);
 652  err_del_bss:
 653         sdata->bss = NULL;
 654         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 655                 list_del(&sdata->u.vlan.list);
 656         /* might already be clear but that doesn't matter */
 657         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 658         return res;
 659 }
 660
 661 static int ieee80211_open(struct net_device *dev)
 662 {
 663         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 664         int err;
 665
 666         /* fail early if user set an invalid address */
 667         if (!is_valid_ether_addr(dev->dev_addr))
 668                 return -EADDRNOTAVAIL;
 669
 670         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 671         if (err)
 672                 return err;
 673
 674         return ieee80211_do_open(&sdata->wdev, true);
 675 }
 676
 677 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 678                               bool going_down)
 679 {
 680         struct ieee80211_local *local = sdata->local;
 681         unsigned long flags;
 682         struct sk_buff *skb, *tmp;
 683         u32 hw_reconf_flags = 0;
 684         int i, flushed;
 685         struct ps_data *ps;
 686
 687         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 688
 689         if (rcu_access_pointer(local->scan_sdata) == sdata)
 690                 ieee80211_scan_cancel(local);
 691
 692         /*
 693          * Stop TX on this interface first.
 694          */
 695         if (sdata->dev)
 696                 netif_tx_stop_all_queues(sdata->dev);
 697
 698         ieee80211_roc_purge(sdata);
 699
 700         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 701                 ieee80211_mgd_stop(sdata);
 702
 703         /*
 704          * Remove all stations associated with this interface.
 705          *
 706          * This must be done before calling ops->remove_interface()
 707          * because otherwise we can later invoke ops->sta_notify()
 708          * whenever the STAs are removed, and that invalidates driver
 709          * assumptions about always getting a vif pointer that is valid
 710          * (because if we remove a STA after ops->remove_interface()
 711          * the driver will have removed the vif info already!)
 712          *
 713          * This is relevant only in WDS mode, in all other modes we've
 714          * already removed all stations when disconnecting or similar,
 715          * so warn otherwise.
 716          *
 717          * We call sta_info_flush_cleanup() later, to combine RCU waits.
 718          */
 719         flushed = sta_info_flush_defer(sdata);
 720         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 721                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
 722
 723         /*
 724          * Don't count this interface for promisc/allmulti while it
 725          * is down. dev_mc_unsync() will invoke set_multicast_list
 726          * on the master interface which will sync these down to the
 727          * hardware as filter flags.
 728          */
 729         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 730                 atomic_dec(&local->iff_allmultis);
 731
 732         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 733                 atomic_dec(&local->iff_promiscs);
 734
 735         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 736                 local->fif_pspoll--;
 737                 local->fif_probe_req--;
 738         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 739                 local->fif_probe_req--;
 740         }
 741
 742         if (sdata->dev) {
 743                 netif_addr_lock_bh(sdata->dev);
 744                 spin_lock_bh(&local->filter_lock);
 745                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 746                                  sdata->dev->addr_len);
 747                 spin_unlock_bh(&local->filter_lock);
 748                 netif_addr_unlock_bh(sdata->dev);
 749
 750                 ieee80211_configure_filter(local);
 751         }
 752
 753         del_timer_sync(&local->dynamic_ps_timer);
 754         cancel_work_sync(&local->dynamic_ps_enable_work);
 755
 756         cancel_work_sync(&sdata->recalc_smps);
 757
 758         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 759
 760         if (sdata->wdev.cac_started) {
 761                 mutex_lock(&local->iflist_mtx);
 762                 ieee80211_vif_release_channel(sdata);
 763                 mutex_unlock(&local->iflist_mtx);
 764                 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
 765                                    GFP_KERNEL);
 766         }
 767
 768         /* APs need special treatment */
 769         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 770                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 771
 772                 /* down all dependent devices, that is VLANs */
 773                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 774                                          u.vlan.list)
 775                         dev_close(vlan->dev);
 776                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 777         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 778                 /* remove all packets in parent bc_buf pointing to this dev */
 779                 ps = &sdata->bss->ps;
 780
 781                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 782                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 783                         if (skb->dev == sdata->dev) {
 784                                 __skb_unlink(skb, &ps->bc_buf);
 785                                 local->total_ps_buffered--;
 786                                 ieee80211_free_txskb(&local->hw, skb);
 787                         }
 788                 }
 789                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 790         }
 791
 792         if (going_down)
 793                 local->open_count--;
 794
 795         switch (sdata->vif.type) {
 796         case NL80211_IFTYPE_AP_VLAN:
 797                 list_del(&sdata->u.vlan.list);
 798                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
 799                 /* no need to tell driver */
 800                 break;
 801         case NL80211_IFTYPE_MONITOR:
 802                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 803                         local->cooked_mntrs--;
 804                         break;
 805                 }
 806
 807                 local->monitors--;
 808                 if (local->monitors == 0) {
 809                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 810                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 811                         ieee80211_del_virtual_monitor(local);
 812                 }
 813
 814                 ieee80211_adjust_monitor_flags(sdata, -1);
 815                 ieee80211_configure_filter(local);
 816                 mutex_lock(&local->mtx);
 817                 ieee80211_recalc_idle(local);
 818                 mutex_unlock(&local->mtx);
 819                 break;
 820         case NL80211_IFTYPE_P2P_DEVICE:
 821                 /* relies on synchronize_rcu() below */
 822                 rcu_assign_pointer(local->p2p_sdata, NULL);
 823                 /* fall through */
 824         default:
 825                 cancel_work_sync(&sdata->work);
 826                 /*
 827                  * When we get here, the interface is marked down.
 828                  *
 829                  * sta_info_flush_cleanup() requires rcu_barrier()
 830                  * first to wait for the station call_rcu() calls
 831                  * to complete, here we need at least sychronize_rcu()
 832                  * it to wait for the RX path in case it is using the
 833                  * interface and enqueuing frames at this very time on
 834                  * another CPU.
 835                  */
 836                 rcu_barrier();
 837                 sta_info_flush_cleanup(sdata);
 838
 839                 /*
 840                  * Free all remaining keys, there shouldn't be any,
 841                  * except maybe in WDS mode?
 842                  */
 843                 ieee80211_free_keys(sdata);
 844
 845                 /* fall through */
 846         case NL80211_IFTYPE_AP:
 847                 skb_queue_purge(&sdata->skb_queue);
 848
 849                 drv_remove_interface_debugfs(local, sdata);
 850
 851                 if (going_down)
 852                         drv_remove_interface(local, sdata);
 853         }
 854
 855         sdata->bss = NULL;
 856
 857         ieee80211_recalc_ps(local, -1);
 858
 859         if (local->open_count == 0) {
 860                 ieee80211_clear_tx_pending(local);
 861                 ieee80211_stop_device(local);
 862
 863                 /* no reconfiguring after stop! */
 864                 hw_reconf_flags = 0;
 865         }
 866
 867         /* do after stop to avoid reconfiguring when we stop anyway */
 868         if (hw_reconf_flags)
 869                 ieee80211_hw_config(local, hw_reconf_flags);
 870
 871         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 872         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 873                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 874                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 875                         if (info->control.vif == &sdata->vif) {
 876                                 __skb_unlink(skb, &local->pending[i]);
 877                                 ieee80211_free_txskb(&local->hw, skb);
 878                         }
 879                 }
 880         }
 881         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 882
 883         if (local->monitors == local->open_count && local->monitors > 0)
 884                 ieee80211_add_virtual_monitor(local);
 885 }
 886
 887 static int ieee80211_stop(struct net_device *dev)
 888 {
 889         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 890
 891         ieee80211_do_stop(sdata, true);
 892
 893         return 0;
 894 }
 895
 896 static void ieee80211_set_multicast_list(struct net_device *dev)
 897 {
 898         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 899         struct ieee80211_local *local = sdata->local;
 900         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 901
 902         allmulti = !!(dev->flags & IFF_ALLMULTI);
 903         promisc = !!(dev->flags & IFF_PROMISC);
 904         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 905         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 906
 907         if (allmulti != sdata_allmulti) {
 908                 if (dev->flags & IFF_ALLMULTI)
 909                         atomic_inc(&local->iff_allmultis);
 910                 else
 911                         atomic_dec(&local->iff_allmultis);
 912                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 913         }
 914
 915         if (promisc != sdata_promisc) {
 916                 if (dev->flags & IFF_PROMISC)
 917                         atomic_inc(&local->iff_promiscs);
 918                 else
 919                         atomic_dec(&local->iff_promiscs);
 920                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 921         }
 922         spin_lock_bh(&local->filter_lock);
 923         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 924         spin_unlock_bh(&local->filter_lock);
 925         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 926 }
 927
 928 /*
 929  * Called when the netdev is removed or, by the code below, before
 930  * the interface type changes.
 931  */
 932 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 933 {
 934         int flushed;
 935         int i;
 936
 937         /* free extra data */
 938         ieee80211_free_keys(sdata);
 939
 940         ieee80211_debugfs_remove_netdev(sdata);
 941
 942         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 943                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 944         sdata->fragment_next = 0;
 945
 946         if (ieee80211_vif_is_mesh(&sdata->vif))
 947                 mesh_rmc_free(sdata);
 948
 949         flushed = sta_info_flush(sdata);
 950         WARN_ON(flushed);
 951 }
 952
 953 static void ieee80211_uninit(struct net_device *dev)
 954 {
 955         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
 956 }
 957
 958 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 959                                          struct sk_buff *skb)
 960 {
 961         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 962 }
 963
 964 static const struct net_device_ops ieee80211_dataif_ops = {
 965         .ndo_open               = ieee80211_open,
 966         .ndo_stop               = ieee80211_stop,
 967         .ndo_uninit             = ieee80211_uninit,
 968         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 969         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 970         .ndo_change_mtu         = ieee80211_change_mtu,
 971         .ndo_set_mac_address    = ieee80211_change_mac,
 972         .ndo_select_queue       = ieee80211_netdev_select_queue,
 973 };
 974
 975 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 976                                           struct sk_buff *skb)
 977 {
 978         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 979         struct ieee80211_local *local = sdata->local;
 980         struct ieee80211_hdr *hdr;
 981         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 982
 983         if (local->hw.queues < IEEE80211_NUM_ACS)
 984                 return 0;
 985
 986         if (skb->len < 4 ||
 987             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 988                 return 0; /* doesn't matter, frame will be dropped */
 989
 990         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 991
 992         return ieee80211_select_queue_80211(sdata, skb, hdr);
 993 }
 994
 995 static const struct net_device_ops ieee80211_monitorif_ops = {
 996         .ndo_open               = ieee80211_open,
 997         .ndo_stop               = ieee80211_stop,
 998         .ndo_uninit             = ieee80211_uninit,
 999         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1000         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1001         .ndo_change_mtu         = ieee80211_change_mtu,
1002         .ndo_set_mac_address    = eth_mac_addr,
1003         .ndo_select_queue       = ieee80211_monitor_select_queue,
1004 };
1005
1006 static void ieee80211_if_setup(struct net_device *dev)
1007 {
1008         ether_setup(dev);
1009         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1010         dev->netdev_ops = &ieee80211_dataif_ops;
1011         dev->destructor = free_netdev;
1012 }
1013
1014 static void ieee80211_iface_work(struct work_struct *work)
1015 {
1016         struct ieee80211_sub_if_data *sdata =
1017                 container_of(work, struct ieee80211_sub_if_data, work);
1018         struct ieee80211_local *local = sdata->local;
1019         struct sk_buff *skb;
1020         struct sta_info *sta;
1021         struct ieee80211_ra_tid *ra_tid;
1022
1023         if (!ieee80211_sdata_running(sdata))
1024                 return;
1025
1026         if (local->scanning)
1027                 return;
1028
1029         /*
1030          * ieee80211_queue_work() should have picked up most cases,
1031          * here we'll pick the rest.
1032          */
1033         if (WARN(local->suspended,
1034                  "interface work scheduled while going to suspend\n"))
1035                 return;
1036
1037         /* first process frames */
1038         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1039                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1040
1041                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1042                         ra_tid = (void *)&skb->cb;
1043                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1044                                                  ra_tid->tid);
1045                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1046                         ra_tid = (void *)&skb->cb;
1047                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1048                                                 ra_tid->tid);
1049                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1050                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1051                         int len = skb->len;
1052
1053                         mutex_lock(&local->sta_mtx);
1054                         sta = sta_info_get_bss(sdata, mgmt->sa);
1055                         if (sta) {
1056                                 switch (mgmt->u.action.u.addba_req.action_code) {
1057                                 case WLAN_ACTION_ADDBA_REQ:
1058                                         ieee80211_process_addba_request(
1059                                                         local, sta, mgmt, len);
1060                                         break;
1061                                 case WLAN_ACTION_ADDBA_RESP:
1062                                         ieee80211_process_addba_resp(local, sta,
1063                                                                      mgmt, len);
1064                                         break;
1065                                 case WLAN_ACTION_DELBA:
1066                                         ieee80211_process_delba(sdata, sta,
1067                                                                 mgmt, len);
1068                                         break;
1069                                 default:
1070                                         WARN_ON(1);
1071                                         break;
1072                                 }
1073                         }
1074                         mutex_unlock(&local->sta_mtx);
1075                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1076                         struct ieee80211_hdr *hdr = (void *)mgmt;
1077                         /*
1078                          * So the frame isn't mgmt, but frame_control
1079                          * is at the right place anyway, of course, so
1080                          * the if statement is correct.
1081                          *
1082                          * Warn if we have other data frame types here,
1083                          * they must not get here.
1084                          */
1085                         WARN_ON(hdr->frame_control &
1086                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1087                         WARN_ON(!(hdr->seq_ctrl &
1088                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1089                         /*
1090                          * This was a fragment of a frame, received while
1091                          * a block-ack session was active. That cannot be
1092                          * right, so terminate the session.
1093                          */
1094                         mutex_lock(&local->sta_mtx);
1095                         sta = sta_info_get_bss(sdata, mgmt->sa);
1096                         if (sta) {
1097                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1098                                                 IEEE80211_QOS_CTL_TID_MASK;
1099
1100                                 __ieee80211_stop_rx_ba_session(
1101                                         sta, tid, WLAN_BACK_RECIPIENT,
1102                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1103                                         true);
1104                         }
1105                         mutex_unlock(&local->sta_mtx);
1106                 } else switch (sdata->vif.type) {
1107                 case NL80211_IFTYPE_STATION:
1108                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1109                         break;
1110                 case NL80211_IFTYPE_ADHOC:
1111                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1112                         break;
1113                 case NL80211_IFTYPE_MESH_POINT:
1114                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1115                                 break;
1116                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1117                         break;
1118                 default:
1119                         WARN(1, "frame for unexpected interface type");
1120                         break;
1121                 }
1122
1123                 kfree_skb(skb);
1124         }
1125
1126         /* then other type-dependent work */
1127         switch (sdata->vif.type) {
1128         case NL80211_IFTYPE_STATION:
1129                 ieee80211_sta_work(sdata);
1130                 break;
1131         case NL80211_IFTYPE_ADHOC:
1132                 ieee80211_ibss_work(sdata);
1133                 break;
1134         case NL80211_IFTYPE_MESH_POINT:
1135                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1136                         break;
1137                 ieee80211_mesh_work(sdata);
1138                 break;
1139         default:
1140                 break;
1141         }
1142 }
1143
1144 static void ieee80211_recalc_smps_work(struct work_struct *work)
1145 {
1146         struct ieee80211_sub_if_data *sdata =
1147                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1148
1149         ieee80211_recalc_smps(sdata);
1150 }
1151
1152 /*
1153  * Helper function to initialise an interface to a specific type.
1154  */
1155 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1156                                   enum nl80211_iftype type)
1157 {
1158         /* clear type-dependent union */
1159         memset(&sdata->u, 0, sizeof(sdata->u));
1160
1161         /* and set some type-dependent values */
1162         sdata->vif.type = type;
1163         sdata->vif.p2p = false;
1164         sdata->wdev.iftype = type;
1165
1166         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1167         sdata->control_port_no_encrypt = false;
1168
1169         sdata->noack_map = 0;
1170
1171         /* only monitor/p2p-device differ */
1172         if (sdata->dev) {
1173                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1174                 sdata->dev->type = ARPHRD_ETHER;
1175         }
1176
1177         skb_queue_head_init(&sdata->skb_queue);
1178         INIT_WORK(&sdata->work, ieee80211_iface_work);
1179         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1180
1181         switch (type) {
1182         case NL80211_IFTYPE_P2P_GO:
1183                 type = NL80211_IFTYPE_AP;
1184                 sdata->vif.type = type;
1185                 sdata->vif.p2p = true;
1186                 /* fall through */
1187         case NL80211_IFTYPE_AP:
1188                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1189                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1190                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1191                 break;
1192         case NL80211_IFTYPE_P2P_CLIENT:
1193                 type = NL80211_IFTYPE_STATION;
1194                 sdata->vif.type = type;
1195                 sdata->vif.p2p = true;
1196                 /* fall through */
1197         case NL80211_IFTYPE_STATION:
1198                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1199                 ieee80211_sta_setup_sdata(sdata);
1200                 break;
1201         case NL80211_IFTYPE_ADHOC:
1202                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1203                 ieee80211_ibss_setup_sdata(sdata);
1204                 break;
1205         case NL80211_IFTYPE_MESH_POINT:
1206                 if (ieee80211_vif_is_mesh(&sdata->vif))
1207                         ieee80211_mesh_init_sdata(sdata);
1208                 break;
1209         case NL80211_IFTYPE_MONITOR:
1210                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1211                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1212                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1213                                       MONITOR_FLAG_OTHER_BSS;
1214                 break;
1215         case NL80211_IFTYPE_WDS:
1216                 sdata->vif.bss_conf.bssid = NULL;
1217                 break;
1218         case NL80211_IFTYPE_AP_VLAN:
1219                 break;
1220         case NL80211_IFTYPE_P2P_DEVICE:
1221                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1222                 break;
1223         case NL80211_IFTYPE_UNSPECIFIED:
1224         case NUM_NL80211_IFTYPES:
1225                 BUG();
1226                 break;
1227         }
1228
1229         ieee80211_debugfs_add_netdev(sdata);
1230 }
1231
1232 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1233                                            enum nl80211_iftype type)
1234 {
1235         struct ieee80211_local *local = sdata->local;
1236         int ret, err;
1237         enum nl80211_iftype internal_type = type;
1238         bool p2p = false;
1239
1240         ASSERT_RTNL();
1241
1242         if (!local->ops->change_interface)
1243                 return -EBUSY;
1244
1245         switch (sdata->vif.type) {
1246         case NL80211_IFTYPE_AP:
1247         case NL80211_IFTYPE_STATION:
1248         case NL80211_IFTYPE_ADHOC:
1249                 /*
1250                  * Could maybe also all others here?
1251                  * Just not sure how that interacts
1252                  * with the RX/config path e.g. for
1253                  * mesh.
1254                  */
1255                 break;
1256         default:
1257                 return -EBUSY;
1258         }
1259
1260         switch (type) {
1261         case NL80211_IFTYPE_AP:
1262         case NL80211_IFTYPE_STATION:
1263         case NL80211_IFTYPE_ADHOC:
1264                 /*
1265                  * Could probably support everything
1266                  * but WDS here (WDS do_open can fail
1267                  * under memory pressure, which this
1268                  * code isn't prepared to handle).
1269                  */
1270                 break;
1271         case NL80211_IFTYPE_P2P_CLIENT:
1272                 p2p = true;
1273                 internal_type = NL80211_IFTYPE_STATION;
1274                 break;
1275         case NL80211_IFTYPE_P2P_GO:
1276                 p2p = true;
1277                 internal_type = NL80211_IFTYPE_AP;
1278                 break;
1279         default:
1280                 return -EBUSY;
1281         }
1282
1283         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1284         if (ret)
1285                 return ret;
1286
1287         ieee80211_do_stop(sdata, false);
1288
1289         ieee80211_teardown_sdata(sdata);
1290
1291         ret = drv_change_interface(local, sdata, internal_type, p2p);
1292         if (ret)
1293                 type = sdata->vif.type;
1294
1295         /*
1296          * Ignore return value here, there's not much we can do since
1297          * the driver changed the interface type internally already.
1298          * The warnings will hopefully make driver authors fix it :-)
1299          */
1300         ieee80211_check_queues(sdata);
1301
1302         ieee80211_setup_sdata(sdata, type);
1303
1304         err = ieee80211_do_open(&sdata->wdev, false);
1305         WARN(err, "type change: do_open returned %d", err);
1306
1307         return ret;
1308 }
1309
1310 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1311                              enum nl80211_iftype type)
1312 {
1313         int ret;
1314
1315         ASSERT_RTNL();
1316
1317         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1318                 return 0;
1319
1320         if (ieee80211_sdata_running(sdata)) {
1321                 ret = ieee80211_runtime_change_iftype(sdata, type);
1322                 if (ret)
1323                         return ret;
1324         } else {
1325                 /* Purge and reset type-dependent state. */
1326                 ieee80211_teardown_sdata(sdata);
1327                 ieee80211_setup_sdata(sdata, type);
1328         }
1329
1330         /* reset some values that shouldn't be kept across type changes */
1331         sdata->drop_unencrypted = 0;
1332         if (type == NL80211_IFTYPE_STATION)
1333                 sdata->u.mgd.use_4addr = false;
1334
1335         return 0;
1336 }
1337
1338 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1339                                        u8 *perm_addr, enum nl80211_iftype type)
1340 {
1341         struct ieee80211_sub_if_data *sdata;
1342         u64 mask, start, addr, val, inc;
1343         u8 *m;
1344         u8 tmp_addr[ETH_ALEN];
1345         int i;
1346
1347         /* default ... something at least */
1348         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1349
1350         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1351             local->hw.wiphy->n_addresses <= 1)
1352                 return;
1353
1354         mutex_lock(&local->iflist_mtx);
1355
1356         switch (type) {
1357         case NL80211_IFTYPE_MONITOR:
1358                 /* doesn't matter */
1359                 break;
1360         case NL80211_IFTYPE_WDS:
1361         case NL80211_IFTYPE_AP_VLAN:
1362                 /* match up with an AP interface */
1363                 list_for_each_entry(sdata, &local->interfaces, list) {
1364                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1365                                 continue;
1366                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1367                         break;
1368                 }
1369                 /* keep default if no AP interface present */
1370                 break;
1371         case NL80211_IFTYPE_P2P_CLIENT:
1372         case NL80211_IFTYPE_P2P_GO:
1373                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1374                         list_for_each_entry(sdata, &local->interfaces, list) {
1375                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1376                                         continue;
1377                                 if (!ieee80211_sdata_running(sdata))
1378                                         continue;
1379                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1380                                 goto out_unlock;
1381                         }
1382                 }
1383                 /* otherwise fall through */
1384         default:
1385                 /* assign a new address if possible -- try n_addresses first */
1386                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1387                         bool used = false;
1388
1389                         list_for_each_entry(sdata, &local->interfaces, list) {
1390                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1391                                            sdata->vif.addr, ETH_ALEN) == 0) {
1392                                         used = true;
1393                                         break;
1394                                 }
1395                         }
1396
1397                         if (!used) {
1398                                 memcpy(perm_addr,
1399                                        local->hw.wiphy->addresses[i].addr,
1400                                        ETH_ALEN);
1401                                 break;
1402                         }
1403                 }
1404
1405                 /* try mask if available */
1406                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1407                         break;
1408
1409                 m = local->hw.wiphy->addr_mask;
1410                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1411                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1412                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1413
1414                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1415                         /* not a contiguous mask ... not handled now! */
1416                         pr_info("not contiguous\n");
1417                         break;
1418                 }
1419
1420                 m = local->hw.wiphy->perm_addr;
1421                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1422                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1423                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1424
1425                 inc = 1ULL<<__ffs64(mask);
1426                 val = (start & mask);
1427                 addr = (start & ~mask) | (val & mask);
1428                 do {
1429                         bool used = false;
1430
1431                         tmp_addr[5] = addr >> 0*8;
1432                         tmp_addr[4] = addr >> 1*8;
1433                         tmp_addr[3] = addr >> 2*8;
1434                         tmp_addr[2] = addr >> 3*8;
1435                         tmp_addr[1] = addr >> 4*8;
1436                         tmp_addr[0] = addr >> 5*8;
1437
1438                         val += inc;
1439
1440                         list_for_each_entry(sdata, &local->interfaces, list) {
1441                                 if (memcmp(tmp_addr, sdata->vif.addr,
1442                                                         ETH_ALEN) == 0) {
1443                                         used = true;
1444                                         break;
1445                                 }
1446                         }
1447
1448                         if (!used) {
1449                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1450                                 break;
1451                         }
1452                         addr = (start & ~mask) | (val & mask);
1453                 } while (addr != start);
1454
1455                 break;
1456         }
1457
1458  out_unlock:
1459         mutex_unlock(&local->iflist_mtx);
1460 }
1461
1462 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1463 {
1464         struct ieee80211_sub_if_data *sdata;
1465
1466         sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1467
1468         ieee80211_cleanup_sdata_stas(sdata);
1469 }
1470
1471 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1472                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1473                      struct vif_params *params)
1474 {
1475         struct net_device *ndev = NULL;
1476         struct ieee80211_sub_if_data *sdata = NULL;
1477         int ret, i;
1478         int txqs = 1;
1479
1480         ASSERT_RTNL();
1481
1482         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1483                 struct wireless_dev *wdev;
1484
1485                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1486                                 GFP_KERNEL);
1487                 if (!sdata)
1488                         return -ENOMEM;
1489                 wdev = &sdata->wdev;
1490
1491                 sdata->dev = NULL;
1492                 strlcpy(sdata->name, name, IFNAMSIZ);
1493                 ieee80211_assign_perm_addr(local, wdev->address, type);
1494                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1495         } else {
1496                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1497                         txqs = IEEE80211_NUM_ACS;
1498
1499                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1500                                         local->hw.vif_data_size,
1501                                         name, ieee80211_if_setup, txqs, 1);
1502                 if (!ndev)
1503                         return -ENOMEM;
1504                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1505
1506                 ndev->needed_headroom = local->tx_headroom +
1507                                         4*6 /* four MAC addresses */
1508                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1509                                         + 6 /* mesh */
1510                                         + 8 /* rfc1042/bridge tunnel */
1511                                         - ETH_HLEN /* ethernet hard_header_len */
1512                                         + IEEE80211_ENCRYPT_HEADROOM;
1513                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1514
1515                 ret = dev_alloc_name(ndev, ndev->name);
1516                 if (ret < 0) {
1517                         free_netdev(ndev);
1518                         return ret;
1519                 }
1520
1521                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1522                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1523                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1524
1525                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1526                 sdata = netdev_priv(ndev);
1527                 ndev->ieee80211_ptr = &sdata->wdev;
1528                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1529                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1530
1531                 sdata->dev = ndev;
1532         }
1533
1534         /* initialise type-independent data */
1535         sdata->wdev.wiphy = local->hw.wiphy;
1536         sdata->local = local;
1537
1538         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1539                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1540
1541         INIT_LIST_HEAD(&sdata->key_list);
1542
1543         spin_lock_init(&sdata->cleanup_stations_lock);
1544         INIT_LIST_HEAD(&sdata->cleanup_stations);
1545         INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1546         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1547                           ieee80211_dfs_cac_timer_work);
1548         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1549                           ieee80211_delayed_tailroom_dec);
1550
1551         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1552                 struct ieee80211_supported_band *sband;
1553                 sband = local->hw.wiphy->bands[i];
1554                 sdata->rc_rateidx_mask[i] =
1555                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1556                 if (sband)
1557                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1558                                sband->ht_cap.mcs.rx_mask,
1559                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1560                 else
1561                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1562                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1563         }
1564
1565         ieee80211_set_default_queues(sdata);
1566
1567         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1568         sdata->user_power_level = local->user_power_level;
1569
1570         /* setup type-dependent data */
1571         ieee80211_setup_sdata(sdata, type);
1572
1573         if (ndev) {
1574                 if (params) {
1575                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1576                         if (type == NL80211_IFTYPE_STATION)
1577                                 sdata->u.mgd.use_4addr = params->use_4addr;
1578                 }
1579
1580                 ndev->features |= local->hw.netdev_features;
1581
1582                 ret = register_netdevice(ndev);
1583                 if (ret) {
1584                         free_netdev(ndev);
1585                         return ret;
1586                 }
1587         }
1588
1589         mutex_lock(&local->iflist_mtx);
1590         list_add_tail_rcu(&sdata->list, &local->interfaces);
1591         mutex_unlock(&local->iflist_mtx);
1592
1593         if (new_wdev)
1594                 *new_wdev = &sdata->wdev;
1595
1596         return 0;
1597 }
1598
1599 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1600 {
1601         ASSERT_RTNL();
1602
1603         mutex_lock(&sdata->local->iflist_mtx);
1604         list_del_rcu(&sdata->list);
1605         mutex_unlock(&sdata->local->iflist_mtx);
1606
1607         synchronize_rcu();
1608
1609         if (sdata->dev) {
1610                 unregister_netdevice(sdata->dev);
1611         } else {
1612                 cfg80211_unregister_wdev(&sdata->wdev);
1613                 kfree(sdata);
1614         }
1615 }
1616
1617 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1618 {
1619         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1620                 return;
1621         ieee80211_do_stop(sdata, true);
1622         ieee80211_teardown_sdata(sdata);
1623 }
1624
1625 /*
1626  * Remove all interfaces, may only be called at hardware unregistration
1627  * time because it doesn't do RCU-safe list removals.
1628  */
1629 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1630 {
1631         struct ieee80211_sub_if_data *sdata, *tmp;
1632         LIST_HEAD(unreg_list);
1633         LIST_HEAD(wdev_list);
1634
1635         ASSERT_RTNL();
1636
1637         mutex_lock(&local->iflist_mtx);
1638         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1639                 list_del(&sdata->list);
1640
1641                 if (sdata->dev)
1642                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1643                 else
1644                         list_add(&sdata->list, &wdev_list);
1645         }
1646         mutex_unlock(&local->iflist_mtx);
1647         unregister_netdevice_many(&unreg_list);
1648         list_del(&unreg_list);
1649
1650         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1651                 list_del(&sdata->list);
1652                 cfg80211_unregister_wdev(&sdata->wdev);
1653                 kfree(sdata);
1654         }
1655 }
1656
1657 static int netdev_notify(struct notifier_block *nb,
1658                          unsigned long state,
1659                          void *ndev)
1660 {
1661         struct net_device *dev = ndev;
1662         struct ieee80211_sub_if_data *sdata;
1663
1664         if (state != NETDEV_CHANGENAME)
1665                 return 0;
1666
1667         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1668                 return 0;
1669
1670         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1671                 return 0;
1672
1673         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1674
1675         memcpy(sdata->name, dev->name, IFNAMSIZ);
1676
1677         ieee80211_debugfs_rename_netdev(sdata);
1678         return 0;
1679 }
1680
1681 static struct notifier_block mac80211_netdev_notifier = {
1682         .notifier_call = netdev_notify,
1683 };
1684
1685 int ieee80211_iface_init(void)
1686 {
1687         return register_netdevice_notifier(&mac80211_netdev_notifier);
1688 }
1689
1690 void ieee80211_iface_exit(void)
1691 {
1692         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1693 }