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