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