net/mac80211/iface.c

   1 /*
   2  * Interface handling (except master interface)
   3  *
   4  * Copyright 2002-2005, Instant802 Networks, Inc.
   5  * Copyright 2005-2006, Devicescape Software, Inc.
   6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/if_arp.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/rtnetlink.h>
  18 #include <net/mac80211.h>
  19 #include <net/ieee80211_radiotap.h>
  20 #include "ieee80211_i.h"
  21 #include "sta_info.h"
  22 #include "debugfs_netdev.h"
  23 #include "mesh.h"
  24 #include "led.h"
  25 #include "driver-ops.h"
  26 #include "wme.h"
  27 #include "rate.h"
  28
  29 /**
  30  * DOC: Interface list locking
  31  *
  32  * The interface list in each struct ieee80211_local is protected
  33  * three-fold:
  34  *
  35  * (1) modifications may only be done under the RTNL
  36  * (2) modifications and readers are protected against each other by
  37  *     the iflist_mtx.
  38  * (3) modifications are done in an RCU manner so atomic readers
  39  *     can traverse the list in RCU-safe blocks.
  40  *
  41  * As a consequence, reads (traversals) of the list can be protected
  42  * by either the RTNL, the iflist_mtx or RCU.
  43  */
  44
  45 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  46 {
  47         struct ieee80211_chanctx_conf *chanctx_conf;
  48         int power;
  49
  50         rcu_read_lock();
  51         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  52         if (!chanctx_conf) {
  53                 rcu_read_unlock();
  54                 return false;
  55         }
  56
  57         power = chanctx_conf->def.chan->max_power;
  58         rcu_read_unlock();
  59
  60         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  61                 power = min(power, sdata->user_power_level);
  62
  63         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  64                 power = min(power, sdata->ap_power_level);
  65
  66         if (power != sdata->vif.bss_conf.txpower) {
  67                 sdata->vif.bss_conf.txpower = power;
  68                 ieee80211_hw_config(sdata->local, 0);
  69                 return true;
  70         }
  71
  72         return false;
  73 }
  74
  75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  76 {
  77         if (__ieee80211_recalc_txpower(sdata))
  78                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  79 }
  80
  81 static u32 ieee80211_idle_off(struct ieee80211_local *local)
  82 {
  83         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  84                 return 0;
  85
  86         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  87         return IEEE80211_CONF_CHANGE_IDLE;
  88 }
  89
  90 static u32 ieee80211_idle_on(struct ieee80211_local *local)
  91 {
  92         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  93                 return 0;
  94
  95         drv_flush(local, false);
  96
  97         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
  98         return IEEE80211_CONF_CHANGE_IDLE;
  99 }
 100
 101 void ieee80211_recalc_idle(struct ieee80211_local *local)
 102 {
 103         bool working = false, scanning, active;
 104         unsigned int led_trig_start = 0, led_trig_stop = 0;
 105         struct ieee80211_roc_work *roc;
 106         u32 change;
 107
 108         lockdep_assert_held(&local->mtx);
 109
 110         active = !list_empty(&local->chanctx_list) || local->monitors;
 111
 112         if (!local->ops->remain_on_channel) {
 113                 list_for_each_entry(roc, &local->roc_list, list) {
 114                         working = true;
 115                         break;
 116                 }
 117         }
 118
 119         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 120                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 121
 122         if (working || scanning)
 123                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 124         else
 125                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 126
 127         if (active)
 128                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 129         else
 130                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 131
 132         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 133
 134         if (working || scanning || active)
 135                 change = ieee80211_idle_off(local);
 136         else
 137                 change = ieee80211_idle_on(local);
 138         if (change)
 139                 ieee80211_hw_config(local, change);
 140 }
 141
 142 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 143 {
 144         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
 145                 return -EINVAL;
 146
 147         dev->mtu = new_mtu;
 148         return 0;
 149 }
 150
 151 static int ieee80211_verify_mac(struct ieee80211_local *local, u8 *addr)
 152 {
 153         struct ieee80211_sub_if_data *sdata;
 154         u64 new, mask, tmp;
 155         u8 *m;
 156         int ret = 0;
 157
 158         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 159                 return 0;
 160
 161         m = addr;
 162         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 163                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 164                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 165
 166         m = local->hw.wiphy->addr_mask;
 167         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 168                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 169                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 170
 171
 172         mutex_lock(&local->iflist_mtx);
 173         list_for_each_entry(sdata, &local->interfaces, list) {
 174                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
 175                         continue;
 176
 177                 m = sdata->vif.addr;
 178                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 179                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 180                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 181
 182                 if ((new & ~mask) != (tmp & ~mask)) {
 183                         ret = -EINVAL;
 184                         break;
 185                 }
 186         }
 187         mutex_unlock(&local->iflist_mtx);
 188
 189         return ret;
 190 }
 191
 192 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 193 {
 194         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 195         struct sockaddr *sa = addr;
 196         int ret;
 197
 198         if (ieee80211_sdata_running(sdata))
 199                 return -EBUSY;
 200
 201         ret = ieee80211_verify_mac(sdata->local, sa->sa_data);
 202         if (ret)
 203                 return ret;
 204
 205         ret = eth_mac_addr(dev, sa);
 206
 207         if (ret == 0)
 208                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 209
 210         return ret;
 211 }
 212
 213 static inline int identical_mac_addr_allowed(int type1, int type2)
 214 {
 215         return type1 == NL80211_IFTYPE_MONITOR ||
 216                 type2 == NL80211_IFTYPE_MONITOR ||
 217                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 218                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 219                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 220                 (type1 == NL80211_IFTYPE_WDS &&
 221                         (type2 == NL80211_IFTYPE_WDS ||
 222                          type2 == NL80211_IFTYPE_AP)) ||
 223                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 224                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 225                         (type2 == NL80211_IFTYPE_AP ||
 226                          type2 == NL80211_IFTYPE_AP_VLAN));
 227 }
 228
 229 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 230                                             enum nl80211_iftype iftype)
 231 {
 232         struct ieee80211_local *local = sdata->local;
 233         struct ieee80211_sub_if_data *nsdata;
 234
 235         ASSERT_RTNL();
 236
 237         /* we hold the RTNL here so can safely walk the list */
 238         list_for_each_entry(nsdata, &local->interfaces, list) {
 239                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 240                         /*
 241                          * Allow only a single IBSS interface to be up at any
 242                          * time. This is restricted because beacon distribution
 243                          * cannot work properly if both are in the same IBSS.
 244                          *
 245                          * To remove this restriction we'd have to disallow them
 246                          * from setting the same SSID on different IBSS interfaces
 247                          * belonging to the same hardware. Then, however, we're
 248                          * faced with having to adopt two different TSF timers...
 249                          */
 250                         if (iftype == NL80211_IFTYPE_ADHOC &&
 251                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 252                                 return -EBUSY;
 253
 254                         /*
 255                          * The remaining checks are only performed for interfaces
 256                          * with the same MAC address.
 257                          */
 258                         if (!ether_addr_equal(sdata->vif.addr,
 259                                               nsdata->vif.addr))
 260                                 continue;
 261
 262                         /*
 263                          * check whether it may have the same address
 264                          */
 265                         if (!identical_mac_addr_allowed(iftype,
 266                                                         nsdata->vif.type))
 267                                 return -ENOTUNIQ;
 268
 269                         /*
 270                          * can only add VLANs to enabled APs
 271                          */
 272                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 273                             nsdata->vif.type == NL80211_IFTYPE_AP)
 274                                 sdata->bss = &nsdata->u.ap;
 275                 }
 276         }
 277
 278         return 0;
 279 }
 280
 281 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
 282 {
 283         int n_queues = sdata->local->hw.queues;
 284         int i;
 285
 286         if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
 287                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 288                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 289                                          IEEE80211_INVAL_HW_QUEUE))
 290                                 return -EINVAL;
 291                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 292                                          n_queues))
 293                                 return -EINVAL;
 294                 }
 295         }
 296
 297         if ((sdata->vif.type != NL80211_IFTYPE_AP &&
 298              sdata->vif.type != NL80211_IFTYPE_MESH_POINT) ||
 299             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
 300                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 301                 return 0;
 302         }
 303
 304         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 305                 return -EINVAL;
 306
 307         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 308                 return -EINVAL;
 309
 310         return 0;
 311 }
 312
 313 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 314                                     const int offset)
 315 {
 316         struct ieee80211_local *local = sdata->local;
 317         u32 flags = sdata->u.mntr_flags;
 318
 319 #define ADJUST(_f, _s)  do {                                    \
 320         if (flags & MONITOR_FLAG_##_f)                          \
 321                 local->fif_##_s += offset;                      \
 322         } while (0)
 323
 324         ADJUST(FCSFAIL, fcsfail);
 325         ADJUST(PLCPFAIL, plcpfail);
 326         ADJUST(CONTROL, control);
 327         ADJUST(CONTROL, pspoll);
 328         ADJUST(OTHER_BSS, other_bss);
 329
 330 #undef ADJUST
 331 }
 332
 333 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 334 {
 335         struct ieee80211_local *local = sdata->local;
 336         int i;
 337
 338         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 339                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
 340                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 341                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 342                         sdata->vif.hw_queue[i] = i;
 343                 else
 344                         sdata->vif.hw_queue[i] = 0;
 345         }
 346         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 347 }
 348
 349 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 350 {
 351         struct ieee80211_sub_if_data *sdata;
 352         int ret = 0;
 353
 354         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 355                 return 0;
 356
 357         mutex_lock(&local->iflist_mtx);
 358
 359         if (local->monitor_sdata)
 360                 goto out_unlock;
 361
 362         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 363         if (!sdata) {
 364                 ret = -ENOMEM;
 365                 goto out_unlock;
 366         }
 367
 368         /* set up data */
 369         sdata->local = local;
 370         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 371         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 372                  wiphy_name(local->hw.wiphy));
 373
 374         ieee80211_set_default_queues(sdata);
 375
 376         ret = drv_add_interface(local, sdata);
 377         if (WARN_ON(ret)) {
 378                 /* ok .. stupid driver, it asked for this! */
 379                 kfree(sdata);
 380                 goto out_unlock;
 381         }
 382
 383         ret = ieee80211_check_queues(sdata);
 384         if (ret) {
 385                 kfree(sdata);
 386                 goto out_unlock;
 387         }
 388
 389         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 390                                         IEEE80211_CHANCTX_EXCLUSIVE);
 391         if (ret) {
 392                 drv_remove_interface(local, sdata);
 393                 kfree(sdata);
 394                 goto out_unlock;
 395         }
 396
 397         rcu_assign_pointer(local->monitor_sdata, sdata);
 398  out_unlock:
 399         mutex_unlock(&local->iflist_mtx);
 400         return ret;
 401 }
 402
 403 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 404 {
 405         struct ieee80211_sub_if_data *sdata;
 406
 407         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 408                 return;
 409
 410         mutex_lock(&local->iflist_mtx);
 411
 412         sdata = rcu_dereference_protected(local->monitor_sdata,
 413                                           lockdep_is_held(&local->iflist_mtx));
 414         if (!sdata)
 415                 goto out_unlock;
 416
 417         rcu_assign_pointer(local->monitor_sdata, NULL);
 418         synchronize_net();
 419
 420         ieee80211_vif_release_channel(sdata);
 421
 422         drv_remove_interface(local, sdata);
 423
 424         kfree(sdata);
 425  out_unlock:
 426         mutex_unlock(&local->iflist_mtx);
 427 }
 428
 429 /*
 430  * NOTE: Be very careful when changing this function, it must NOT return
 431  * an error on interface type changes that have been pre-checked, so most
 432  * checks should be in ieee80211_check_concurrent_iface.
 433  */
 434 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 435 {
 436         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 437         struct net_device *dev = wdev->netdev;
 438         struct ieee80211_local *local = sdata->local;
 439         struct sta_info *sta;
 440         u32 changed = 0;
 441         int res;
 442         u32 hw_reconf_flags = 0;
 443
 444         switch (sdata->vif.type) {
 445         case NL80211_IFTYPE_WDS:
 446                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 447                         return -ENOLINK;
 448                 break;
 449         case NL80211_IFTYPE_AP_VLAN: {
 450                 struct ieee80211_sub_if_data *master;
 451
 452                 if (!sdata->bss)
 453                         return -ENOLINK;
 454
 455                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 456
 457                 master = container_of(sdata->bss,
 458                                       struct ieee80211_sub_if_data, u.ap);
 459                 sdata->control_port_protocol =
 460                         master->control_port_protocol;
 461                 sdata->control_port_no_encrypt =
 462                         master->control_port_no_encrypt;
 463                 break;
 464                 }
 465         case NL80211_IFTYPE_AP:
 466                 sdata->bss = &sdata->u.ap;
 467                 break;
 468         case NL80211_IFTYPE_MESH_POINT:
 469         case NL80211_IFTYPE_STATION:
 470         case NL80211_IFTYPE_MONITOR:
 471         case NL80211_IFTYPE_ADHOC:
 472         case NL80211_IFTYPE_P2P_DEVICE:
 473                 /* no special treatment */
 474                 break;
 475         case NL80211_IFTYPE_UNSPECIFIED:
 476         case NUM_NL80211_IFTYPES:
 477         case NL80211_IFTYPE_P2P_CLIENT:
 478         case NL80211_IFTYPE_P2P_GO:
 479                 /* cannot happen */
 480                 WARN_ON(1);
 481                 break;
 482         }
 483
 484         if (local->open_count == 0) {
 485                 res = drv_start(local);
 486                 if (res)
 487                         goto err_del_bss;
 488                 /* we're brought up, everything changes */
 489                 hw_reconf_flags = ~0;
 490                 ieee80211_led_radio(local, true);
 491                 ieee80211_mod_tpt_led_trig(local,
 492                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 493         }
 494
 495         /*
 496          * Copy the hopefully now-present MAC address to
 497          * this interface, if it has the special null one.
 498          */
 499         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 500                 memcpy(dev->dev_addr,
 501                        local->hw.wiphy->perm_addr,
 502                        ETH_ALEN);
 503                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 504
 505                 if (!is_valid_ether_addr(dev->dev_addr)) {
 506                         res = -EADDRNOTAVAIL;
 507                         goto err_stop;
 508                 }
 509         }
 510
 511         switch (sdata->vif.type) {
 512         case NL80211_IFTYPE_AP_VLAN:
 513                 /* no need to tell driver, but set carrier and chanctx */
 514                 if (rtnl_dereference(sdata->bss->beacon)) {
 515                         ieee80211_vif_vlan_copy_chanctx(sdata);
 516                         netif_carrier_on(dev);
 517                 } else {
 518                         netif_carrier_off(dev);
 519                 }
 520                 break;
 521         case NL80211_IFTYPE_MONITOR:
 522                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 523                         local->cooked_mntrs++;
 524                         break;
 525                 }
 526
 527                 if (local->monitors == 0 && local->open_count == 0) {
 528                         res = ieee80211_add_virtual_monitor(local);
 529                         if (res)
 530                                 goto err_stop;
 531                 }
 532
 533                 /* must be before the call to ieee80211_configure_filter */
 534                 local->monitors++;
 535                 if (local->monitors == 1) {
 536                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 537                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 538                 }
 539
 540                 ieee80211_adjust_monitor_flags(sdata, 1);
 541                 ieee80211_configure_filter(local);
 542                 mutex_lock(&local->mtx);
 543                 ieee80211_recalc_idle(local);
 544                 mutex_unlock(&local->mtx);
 545
 546                 netif_carrier_on(dev);
 547                 break;
 548         default:
 549                 if (coming_up) {
 550                         ieee80211_del_virtual_monitor(local);
 551
 552                         res = drv_add_interface(local, sdata);
 553                         if (res)
 554                                 goto err_stop;
 555                         res = ieee80211_check_queues(sdata);
 556                         if (res)
 557                                 goto err_del_interface;
 558                 }
 559
 560                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 561                         local->fif_pspoll++;
 562                         local->fif_probe_req++;
 563
 564                         ieee80211_configure_filter(local);
 565                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 566                         local->fif_probe_req++;
 567                 }
 568
 569                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 570                         changed |= ieee80211_reset_erp_info(sdata);
 571                 ieee80211_bss_info_change_notify(sdata, changed);
 572
 573                 switch (sdata->vif.type) {
 574                 case NL80211_IFTYPE_STATION:
 575                 case NL80211_IFTYPE_ADHOC:
 576                 case NL80211_IFTYPE_AP:
 577                 case NL80211_IFTYPE_MESH_POINT:
 578                         netif_carrier_off(dev);
 579                         break;
 580                 case NL80211_IFTYPE_WDS:
 581                 case NL80211_IFTYPE_P2P_DEVICE:
 582                         break;
 583                 default:
 584                         netif_carrier_on(dev);
 585                 }
 586
 587                 /*
 588                  * set default queue parameters so drivers don't
 589                  * need to initialise the hardware if the hardware
 590                  * doesn't start up with sane defaults
 591                  */
 592                 ieee80211_set_wmm_default(sdata, true);
 593         }
 594
 595         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 596
 597         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 598                 /* Create STA entry for the WDS peer */
 599                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 600                                      GFP_KERNEL);
 601                 if (!sta) {
 602                         res = -ENOMEM;
 603                         goto err_del_interface;
 604                 }
 605
 606                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 607                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 608                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 609
 610                 res = sta_info_insert(sta);
 611                 if (res) {
 612                         /* STA has been freed */
 613                         goto err_del_interface;
 614                 }
 615
 616                 rate_control_rate_init(sta);
 617                 netif_carrier_on(dev);
 618         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 619                 rcu_assign_pointer(local->p2p_sdata, sdata);
 620         }
 621
 622         /*
 623          * set_multicast_list will be invoked by the networking core
 624          * which will check whether any increments here were done in
 625          * error and sync them down to the hardware as filter flags.
 626          */
 627         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 628                 atomic_inc(&local->iff_allmultis);
 629
 630         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 631                 atomic_inc(&local->iff_promiscs);
 632
 633         if (coming_up)
 634                 local->open_count++;
 635
 636         if (hw_reconf_flags)
 637                 ieee80211_hw_config(local, hw_reconf_flags);
 638
 639         ieee80211_recalc_ps(local, -1);
 640
 641         if (dev)
 642                 netif_tx_start_all_queues(dev);
 643
 644         return 0;
 645  err_del_interface:
 646         drv_remove_interface(local, sdata);
 647  err_stop:
 648         if (!local->open_count)
 649                 drv_stop(local);
 650  err_del_bss:
 651         sdata->bss = NULL;
 652         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 653                 list_del(&sdata->u.vlan.list);
 654         /* might already be clear but that doesn't matter */
 655         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 656         return res;
 657 }
 658
 659 static int ieee80211_open(struct net_device *dev)
 660 {
 661         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 662         int err;
 663
 664         /* fail early if user set an invalid address */
 665         if (!is_valid_ether_addr(dev->dev_addr))
 666                 return -EADDRNOTAVAIL;
 667
 668         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 669         if (err)
 670                 return err;
 671
 672         return ieee80211_do_open(&sdata->wdev, true);
 673 }
 674
 675 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 676                               bool going_down)
 677 {
 678         struct ieee80211_local *local = sdata->local;
 679         unsigned long flags;
 680         struct sk_buff *skb, *tmp;
 681         u32 hw_reconf_flags = 0;
 682         int i, flushed;
 683         struct ps_data *ps;
 684
 685         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 686
 687         if (rcu_access_pointer(local->scan_sdata) == sdata)
 688                 ieee80211_scan_cancel(local);
 689
 690         /*
 691          * Stop TX on this interface first.
 692          */
 693         if (sdata->dev)
 694                 netif_tx_stop_all_queues(sdata->dev);
 695
 696         ieee80211_roc_purge(sdata);
 697
 698         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 699                 ieee80211_mgd_stop(sdata);
 700
 701         /*
 702          * Remove all stations associated with this interface.
 703          *
 704          * This must be done before calling ops->remove_interface()
 705          * because otherwise we can later invoke ops->sta_notify()
 706          * whenever the STAs are removed, and that invalidates driver
 707          * assumptions about always getting a vif pointer that is valid
 708          * (because if we remove a STA after ops->remove_interface()
 709          * the driver will have removed the vif info already!)
 710          *
 711          * This is relevant only in WDS mode, in all other modes we've
 712          * already removed all stations when disconnecting or similar,
 713          * so warn otherwise.
 714          *
 715          * We call sta_info_flush_cleanup() later, to combine RCU waits.
 716          */
 717         flushed = sta_info_flush_defer(sdata);
 718         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 719                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
 720
 721         /*
 722          * Don't count this interface for promisc/allmulti while it
 723          * is down. dev_mc_unsync() will invoke set_multicast_list
 724          * on the master interface which will sync these down to the
 725          * hardware as filter flags.
 726          */
 727         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 728                 atomic_dec(&local->iff_allmultis);
 729
 730         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 731                 atomic_dec(&local->iff_promiscs);
 732
 733         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 734                 local->fif_pspoll--;
 735                 local->fif_probe_req--;
 736         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 737                 local->fif_probe_req--;
 738         }
 739
 740         if (sdata->dev) {
 741                 netif_addr_lock_bh(sdata->dev);
 742                 spin_lock_bh(&local->filter_lock);
 743                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 744                                  sdata->dev->addr_len);
 745                 spin_unlock_bh(&local->filter_lock);
 746                 netif_addr_unlock_bh(sdata->dev);
 747
 748                 ieee80211_configure_filter(local);
 749         }
 750
 751         del_timer_sync(&local->dynamic_ps_timer);
 752         cancel_work_sync(&local->dynamic_ps_enable_work);
 753
 754         cancel_work_sync(&sdata->recalc_smps);
 755
 756         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 757
 758         if (sdata->wdev.cac_started) {
 759                 mutex_lock(&local->iflist_mtx);
 760                 ieee80211_vif_release_channel(sdata);
 761                 mutex_unlock(&local->iflist_mtx);
 762                 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
 763                                    GFP_KERNEL);
 764         }
 765
 766         /* APs need special treatment */
 767         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 768                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 769
 770                 /* down all dependent devices, that is VLANs */
 771                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 772                                          u.vlan.list)
 773                         dev_close(vlan->dev);
 774                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 775         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 776                 /* remove all packets in parent bc_buf pointing to this dev */
 777                 ps = &sdata->bss->ps;
 778
 779                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 780                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 781                         if (skb->dev == sdata->dev) {
 782                                 __skb_unlink(skb, &ps->bc_buf);
 783                                 local->total_ps_buffered--;
 784                                 ieee80211_free_txskb(&local->hw, skb);
 785                         }
 786                 }
 787                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 788         }
 789
 790         if (going_down)
 791                 local->open_count--;
 792
 793         switch (sdata->vif.type) {
 794         case NL80211_IFTYPE_AP_VLAN:
 795                 list_del(&sdata->u.vlan.list);
 796                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
 797                 /* no need to tell driver */
 798                 break;
 799         case NL80211_IFTYPE_MONITOR:
 800                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 801                         local->cooked_mntrs--;
 802                         break;
 803                 }
 804
 805                 local->monitors--;
 806                 if (local->monitors == 0) {
 807                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 808                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 809                         ieee80211_del_virtual_monitor(local);
 810                 }
 811
 812                 ieee80211_adjust_monitor_flags(sdata, -1);
 813                 ieee80211_configure_filter(local);
 814                 mutex_lock(&local->mtx);
 815                 ieee80211_recalc_idle(local);
 816                 mutex_unlock(&local->mtx);
 817                 break;
 818         case NL80211_IFTYPE_P2P_DEVICE:
 819                 /* relies on synchronize_rcu() below */
 820                 rcu_assign_pointer(local->p2p_sdata, NULL);
 821                 /* fall through */
 822         default:
 823                 cancel_work_sync(&sdata->work);
 824                 /*
 825                  * When we get here, the interface is marked down.
 826                  *
 827                  * sta_info_flush_cleanup() requires rcu_barrier()
 828                  * first to wait for the station call_rcu() calls
 829                  * to complete, here we need at least sychronize_rcu()
 830                  * it to wait for the RX path in case it is using the
 831                  * interface and enqueuing frames at this very time on
 832                  * another CPU.
 833                  */
 834                 rcu_barrier();
 835                 sta_info_flush_cleanup(sdata);
 836
 837                 /*
 838                  * Free all remaining keys, there shouldn't be any,
 839                  * except maybe in WDS mode?
 840                  */
 841                 ieee80211_free_keys(sdata);
 842
 843                 /* fall through */
 844         case NL80211_IFTYPE_AP:
 845                 skb_queue_purge(&sdata->skb_queue);
 846
 847                 if (going_down)
 848                         drv_remove_interface(local, sdata);
 849         }
 850
 851         sdata->bss = NULL;
 852
 853         ieee80211_recalc_ps(local, -1);
 854
 855         if (local->open_count == 0) {
 856                 ieee80211_clear_tx_pending(local);
 857                 ieee80211_stop_device(local);
 858
 859                 /* no reconfiguring after stop! */
 860                 hw_reconf_flags = 0;
 861         }
 862
 863         /* do after stop to avoid reconfiguring when we stop anyway */
 864         if (hw_reconf_flags)
 865                 ieee80211_hw_config(local, hw_reconf_flags);
 866
 867         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 868         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 869                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 870                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 871                         if (info->control.vif == &sdata->vif) {
 872                                 __skb_unlink(skb, &local->pending[i]);
 873                                 ieee80211_free_txskb(&local->hw, skb);
 874                         }
 875                 }
 876         }
 877         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 878
 879         if (local->monitors == local->open_count && local->monitors > 0)
 880                 ieee80211_add_virtual_monitor(local);
 881 }
 882
 883 static int ieee80211_stop(struct net_device *dev)
 884 {
 885         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 886
 887         ieee80211_do_stop(sdata, true);
 888
 889         return 0;
 890 }
 891
 892 static void ieee80211_set_multicast_list(struct net_device *dev)
 893 {
 894         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 895         struct ieee80211_local *local = sdata->local;
 896         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 897
 898         allmulti = !!(dev->flags & IFF_ALLMULTI);
 899         promisc = !!(dev->flags & IFF_PROMISC);
 900         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 901         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 902
 903         if (allmulti != sdata_allmulti) {
 904                 if (dev->flags & IFF_ALLMULTI)
 905                         atomic_inc(&local->iff_allmultis);
 906                 else
 907                         atomic_dec(&local->iff_allmultis);
 908                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 909         }
 910
 911         if (promisc != sdata_promisc) {
 912                 if (dev->flags & IFF_PROMISC)
 913                         atomic_inc(&local->iff_promiscs);
 914                 else
 915                         atomic_dec(&local->iff_promiscs);
 916                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 917         }
 918
 919         /*
 920          * TODO: If somebody needs this on AP interfaces,
 921          *       it can be enabled easily but multicast
 922          *       addresses from VLANs need to be synced.
 923          */
 924         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 925             sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
 926             sdata->vif.type != NL80211_IFTYPE_AP)
 927                 drv_set_multicast_list(local, sdata, &dev->mc);
 928
 929         spin_lock_bh(&local->filter_lock);
 930         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 931         spin_unlock_bh(&local->filter_lock);
 932         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 933 }
 934
 935 /*
 936  * Called when the netdev is removed or, by the code below, before
 937  * the interface type changes.
 938  */
 939 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 940 {
 941         int flushed;
 942         int i;
 943
 944         /* free extra data */
 945         ieee80211_free_keys(sdata);
 946
 947         ieee80211_debugfs_remove_netdev(sdata);
 948
 949         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 950                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 951         sdata->fragment_next = 0;
 952
 953         if (ieee80211_vif_is_mesh(&sdata->vif))
 954                 mesh_rmc_free(sdata);
 955
 956         flushed = sta_info_flush(sdata);
 957         WARN_ON(flushed);
 958 }
 959
 960 static void ieee80211_uninit(struct net_device *dev)
 961 {
 962         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
 963 }
 964
 965 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 966                                          struct sk_buff *skb)
 967 {
 968         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 969 }
 970
 971 static const struct net_device_ops ieee80211_dataif_ops = {
 972         .ndo_open               = ieee80211_open,
 973         .ndo_stop               = ieee80211_stop,
 974         .ndo_uninit             = ieee80211_uninit,
 975         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 976         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 977         .ndo_change_mtu         = ieee80211_change_mtu,
 978         .ndo_set_mac_address    = ieee80211_change_mac,
 979         .ndo_select_queue       = ieee80211_netdev_select_queue,
 980 };
 981
 982 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 983                                           struct sk_buff *skb)
 984 {
 985         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 986         struct ieee80211_local *local = sdata->local;
 987         struct ieee80211_hdr *hdr;
 988         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 989
 990         if (local->hw.queues < IEEE80211_NUM_ACS)
 991                 return 0;
 992
 993         if (skb->len < 4 ||
 994             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 995                 return 0; /* doesn't matter, frame will be dropped */
 996
 997         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 998
 999         return ieee80211_select_queue_80211(sdata, skb, hdr);
1000 }
1001
1002 static const struct net_device_ops ieee80211_monitorif_ops = {
1003         .ndo_open               = ieee80211_open,
1004         .ndo_stop               = ieee80211_stop,
1005         .ndo_uninit             = ieee80211_uninit,
1006         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1007         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1008         .ndo_change_mtu         = ieee80211_change_mtu,
1009         .ndo_set_mac_address    = eth_mac_addr,
1010         .ndo_select_queue       = ieee80211_monitor_select_queue,
1011 };
1012
1013 static void ieee80211_if_setup(struct net_device *dev)
1014 {
1015         ether_setup(dev);
1016         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1017         dev->netdev_ops = &ieee80211_dataif_ops;
1018         dev->destructor = free_netdev;
1019 }
1020
1021 static void ieee80211_iface_work(struct work_struct *work)
1022 {
1023         struct ieee80211_sub_if_data *sdata =
1024                 container_of(work, struct ieee80211_sub_if_data, work);
1025         struct ieee80211_local *local = sdata->local;
1026         struct sk_buff *skb;
1027         struct sta_info *sta;
1028         struct ieee80211_ra_tid *ra_tid;
1029
1030         if (!ieee80211_sdata_running(sdata))
1031                 return;
1032
1033         if (local->scanning)
1034                 return;
1035
1036         /*
1037          * ieee80211_queue_work() should have picked up most cases,
1038          * here we'll pick the rest.
1039          */
1040         if (WARN(local->suspended,
1041                  "interface work scheduled while going to suspend\n"))
1042                 return;
1043
1044         /* first process frames */
1045         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1046                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1047
1048                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1049                         ra_tid = (void *)&skb->cb;
1050                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1051                                                  ra_tid->tid);
1052                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1053                         ra_tid = (void *)&skb->cb;
1054                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1055                                                 ra_tid->tid);
1056                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1057                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1058                         int len = skb->len;
1059
1060                         mutex_lock(&local->sta_mtx);
1061                         sta = sta_info_get_bss(sdata, mgmt->sa);
1062                         if (sta) {
1063                                 switch (mgmt->u.action.u.addba_req.action_code) {
1064                                 case WLAN_ACTION_ADDBA_REQ:
1065                                         ieee80211_process_addba_request(
1066                                                         local, sta, mgmt, len);
1067                                         break;
1068                                 case WLAN_ACTION_ADDBA_RESP:
1069                                         ieee80211_process_addba_resp(local, sta,
1070                                                                      mgmt, len);
1071                                         break;
1072                                 case WLAN_ACTION_DELBA:
1073                                         ieee80211_process_delba(sdata, sta,
1074                                                                 mgmt, len);
1075                                         break;
1076                                 default:
1077                                         WARN_ON(1);
1078                                         break;
1079                                 }
1080                         }
1081                         mutex_unlock(&local->sta_mtx);
1082                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1083                         struct ieee80211_hdr *hdr = (void *)mgmt;
1084                         /*
1085                          * So the frame isn't mgmt, but frame_control
1086                          * is at the right place anyway, of course, so
1087                          * the if statement is correct.
1088                          *
1089                          * Warn if we have other data frame types here,
1090                          * they must not get here.
1091                          */
1092                         WARN_ON(hdr->frame_control &
1093                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1094                         WARN_ON(!(hdr->seq_ctrl &
1095                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1096                         /*
1097                          * This was a fragment of a frame, received while
1098                          * a block-ack session was active. That cannot be
1099                          * right, so terminate the session.
1100                          */
1101                         mutex_lock(&local->sta_mtx);
1102                         sta = sta_info_get_bss(sdata, mgmt->sa);
1103                         if (sta) {
1104                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1105                                                 IEEE80211_QOS_CTL_TID_MASK;
1106
1107                                 __ieee80211_stop_rx_ba_session(
1108                                         sta, tid, WLAN_BACK_RECIPIENT,
1109                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1110                                         true);
1111                         }
1112                         mutex_unlock(&local->sta_mtx);
1113                 } else switch (sdata->vif.type) {
1114                 case NL80211_IFTYPE_STATION:
1115                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1116                         break;
1117                 case NL80211_IFTYPE_ADHOC:
1118                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1119                         break;
1120                 case NL80211_IFTYPE_MESH_POINT:
1121                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1122                                 break;
1123                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1124                         break;
1125                 default:
1126                         WARN(1, "frame for unexpected interface type");
1127                         break;
1128                 }
1129
1130                 kfree_skb(skb);
1131         }
1132
1133         /* then other type-dependent work */
1134         switch (sdata->vif.type) {
1135         case NL80211_IFTYPE_STATION:
1136                 ieee80211_sta_work(sdata);
1137                 break;
1138         case NL80211_IFTYPE_ADHOC:
1139                 ieee80211_ibss_work(sdata);
1140                 break;
1141         case NL80211_IFTYPE_MESH_POINT:
1142                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1143                         break;
1144                 ieee80211_mesh_work(sdata);
1145                 break;
1146         default:
1147                 break;
1148         }
1149 }
1150
1151 static void ieee80211_recalc_smps_work(struct work_struct *work)
1152 {
1153         struct ieee80211_sub_if_data *sdata =
1154                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1155
1156         ieee80211_recalc_smps(sdata);
1157 }
1158
1159 /*
1160  * Helper function to initialise an interface to a specific type.
1161  */
1162 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1163                                   enum nl80211_iftype type)
1164 {
1165         /* clear type-dependent union */
1166         memset(&sdata->u, 0, sizeof(sdata->u));
1167
1168         /* and set some type-dependent values */
1169         sdata->vif.type = type;
1170         sdata->vif.p2p = false;
1171         sdata->wdev.iftype = type;
1172
1173         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1174         sdata->control_port_no_encrypt = false;
1175
1176         sdata->noack_map = 0;
1177
1178         /* only monitor/p2p-device differ */
1179         if (sdata->dev) {
1180                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1181                 sdata->dev->type = ARPHRD_ETHER;
1182         }
1183
1184         skb_queue_head_init(&sdata->skb_queue);
1185         INIT_WORK(&sdata->work, ieee80211_iface_work);
1186         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1187
1188         switch (type) {
1189         case NL80211_IFTYPE_P2P_GO:
1190                 type = NL80211_IFTYPE_AP;
1191                 sdata->vif.type = type;
1192                 sdata->vif.p2p = true;
1193                 /* fall through */
1194         case NL80211_IFTYPE_AP:
1195                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1196                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1197                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1198                 break;
1199         case NL80211_IFTYPE_P2P_CLIENT:
1200                 type = NL80211_IFTYPE_STATION;
1201                 sdata->vif.type = type;
1202                 sdata->vif.p2p = true;
1203                 /* fall through */
1204         case NL80211_IFTYPE_STATION:
1205                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1206                 ieee80211_sta_setup_sdata(sdata);
1207                 break;
1208         case NL80211_IFTYPE_ADHOC:
1209                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1210                 ieee80211_ibss_setup_sdata(sdata);
1211                 break;
1212         case NL80211_IFTYPE_MESH_POINT:
1213                 if (ieee80211_vif_is_mesh(&sdata->vif))
1214                         ieee80211_mesh_init_sdata(sdata);
1215                 break;
1216         case NL80211_IFTYPE_MONITOR:
1217                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1218                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1219                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1220                                       MONITOR_FLAG_OTHER_BSS;
1221                 break;
1222         case NL80211_IFTYPE_WDS:
1223                 sdata->vif.bss_conf.bssid = NULL;
1224                 break;
1225         case NL80211_IFTYPE_AP_VLAN:
1226                 break;
1227         case NL80211_IFTYPE_P2P_DEVICE:
1228                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1229                 break;
1230         case NL80211_IFTYPE_UNSPECIFIED:
1231         case NUM_NL80211_IFTYPES:
1232                 BUG();
1233                 break;
1234         }
1235
1236         ieee80211_debugfs_add_netdev(sdata);
1237 }
1238
1239 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1240                                            enum nl80211_iftype type)
1241 {
1242         struct ieee80211_local *local = sdata->local;
1243         int ret, err;
1244         enum nl80211_iftype internal_type = type;
1245         bool p2p = false;
1246
1247         ASSERT_RTNL();
1248
1249         if (!local->ops->change_interface)
1250                 return -EBUSY;
1251
1252         switch (sdata->vif.type) {
1253         case NL80211_IFTYPE_AP:
1254         case NL80211_IFTYPE_STATION:
1255         case NL80211_IFTYPE_ADHOC:
1256                 /*
1257                  * Could maybe also all others here?
1258                  * Just not sure how that interacts
1259                  * with the RX/config path e.g. for
1260                  * mesh.
1261                  */
1262                 break;
1263         default:
1264                 return -EBUSY;
1265         }
1266
1267         switch (type) {
1268         case NL80211_IFTYPE_AP:
1269         case NL80211_IFTYPE_STATION:
1270         case NL80211_IFTYPE_ADHOC:
1271                 /*
1272                  * Could probably support everything
1273                  * but WDS here (WDS do_open can fail
1274                  * under memory pressure, which this
1275                  * code isn't prepared to handle).
1276                  */
1277                 break;
1278         case NL80211_IFTYPE_P2P_CLIENT:
1279                 p2p = true;
1280                 internal_type = NL80211_IFTYPE_STATION;
1281                 break;
1282         case NL80211_IFTYPE_P2P_GO:
1283                 p2p = true;
1284                 internal_type = NL80211_IFTYPE_AP;
1285                 break;
1286         default:
1287                 return -EBUSY;
1288         }
1289
1290         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1291         if (ret)
1292                 return ret;
1293
1294         ieee80211_do_stop(sdata, false);
1295
1296         ieee80211_teardown_sdata(sdata);
1297
1298         ret = drv_change_interface(local, sdata, internal_type, p2p);
1299         if (ret)
1300                 type = sdata->vif.type;
1301
1302         /*
1303          * Ignore return value here, there's not much we can do since
1304          * the driver changed the interface type internally already.
1305          * The warnings will hopefully make driver authors fix it :-)
1306          */
1307         ieee80211_check_queues(sdata);
1308
1309         ieee80211_setup_sdata(sdata, type);
1310
1311         err = ieee80211_do_open(&sdata->wdev, false);
1312         WARN(err, "type change: do_open returned %d", err);
1313
1314         return ret;
1315 }
1316
1317 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1318                              enum nl80211_iftype type)
1319 {
1320         int ret;
1321
1322         ASSERT_RTNL();
1323
1324         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1325                 return 0;
1326
1327         if (ieee80211_sdata_running(sdata)) {
1328                 ret = ieee80211_runtime_change_iftype(sdata, type);
1329                 if (ret)
1330                         return ret;
1331         } else {
1332                 /* Purge and reset type-dependent state. */
1333                 ieee80211_teardown_sdata(sdata);
1334                 ieee80211_setup_sdata(sdata, type);
1335         }
1336
1337         /* reset some values that shouldn't be kept across type changes */
1338         sdata->drop_unencrypted = 0;
1339         if (type == NL80211_IFTYPE_STATION)
1340                 sdata->u.mgd.use_4addr = false;
1341
1342         return 0;
1343 }
1344
1345 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1346                                        u8 *perm_addr, enum nl80211_iftype type)
1347 {
1348         struct ieee80211_sub_if_data *sdata;
1349         u64 mask, start, addr, val, inc;
1350         u8 *m;
1351         u8 tmp_addr[ETH_ALEN];
1352         int i;
1353
1354         /* default ... something at least */
1355         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1356
1357         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1358             local->hw.wiphy->n_addresses <= 1)
1359                 return;
1360
1361         mutex_lock(&local->iflist_mtx);
1362
1363         switch (type) {
1364         case NL80211_IFTYPE_MONITOR:
1365                 /* doesn't matter */
1366                 break;
1367         case NL80211_IFTYPE_WDS:
1368         case NL80211_IFTYPE_AP_VLAN:
1369                 /* match up with an AP interface */
1370                 list_for_each_entry(sdata, &local->interfaces, list) {
1371                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1372                                 continue;
1373                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1374                         break;
1375                 }
1376                 /* keep default if no AP interface present */
1377                 break;
1378         case NL80211_IFTYPE_P2P_CLIENT:
1379         case NL80211_IFTYPE_P2P_GO:
1380                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1381                         list_for_each_entry(sdata, &local->interfaces, list) {
1382                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1383                                         continue;
1384                                 if (!ieee80211_sdata_running(sdata))
1385                                         continue;
1386                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1387                                 goto out_unlock;
1388                         }
1389                 }
1390                 /* otherwise fall through */
1391         default:
1392                 /* assign a new address if possible -- try n_addresses first */
1393                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1394                         bool used = false;
1395
1396                         list_for_each_entry(sdata, &local->interfaces, list) {
1397                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1398                                            sdata->vif.addr, ETH_ALEN) == 0) {
1399                                         used = true;
1400                                         break;
1401                                 }
1402                         }
1403
1404                         if (!used) {
1405                                 memcpy(perm_addr,
1406                                        local->hw.wiphy->addresses[i].addr,
1407                                        ETH_ALEN);
1408                                 break;
1409                         }
1410                 }
1411
1412                 /* try mask if available */
1413                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1414                         break;
1415
1416                 m = local->hw.wiphy->addr_mask;
1417                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1418                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1419                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1420
1421                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1422                         /* not a contiguous mask ... not handled now! */
1423                         pr_info("not contiguous\n");
1424                         break;
1425                 }
1426
1427                 m = local->hw.wiphy->perm_addr;
1428                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1429                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1430                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1431
1432                 inc = 1ULL<<__ffs64(mask);
1433                 val = (start & mask);
1434                 addr = (start & ~mask) | (val & mask);
1435                 do {
1436                         bool used = false;
1437
1438                         tmp_addr[5] = addr >> 0*8;
1439                         tmp_addr[4] = addr >> 1*8;
1440                         tmp_addr[3] = addr >> 2*8;
1441                         tmp_addr[2] = addr >> 3*8;
1442                         tmp_addr[1] = addr >> 4*8;
1443                         tmp_addr[0] = addr >> 5*8;
1444
1445                         val += inc;
1446
1447                         list_for_each_entry(sdata, &local->interfaces, list) {
1448                                 if (memcmp(tmp_addr, sdata->vif.addr,
1449                                                         ETH_ALEN) == 0) {
1450                                         used = true;
1451                                         break;
1452                                 }
1453                         }
1454
1455                         if (!used) {
1456                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1457                                 break;
1458                         }
1459                         addr = (start & ~mask) | (val & mask);
1460                 } while (addr != start);
1461
1462                 break;
1463         }
1464
1465  out_unlock:
1466         mutex_unlock(&local->iflist_mtx);
1467 }
1468
1469 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1470 {
1471         struct ieee80211_sub_if_data *sdata;
1472
1473         sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1474
1475         ieee80211_cleanup_sdata_stas(sdata);
1476 }
1477
1478 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1479                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1480                      struct vif_params *params)
1481 {
1482         struct net_device *ndev = NULL;
1483         struct ieee80211_sub_if_data *sdata = NULL;
1484         int ret, i;
1485         int txqs = 1;
1486
1487         ASSERT_RTNL();
1488
1489         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1490                 struct wireless_dev *wdev;
1491
1492                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1493                                 GFP_KERNEL);
1494                 if (!sdata)
1495                         return -ENOMEM;
1496                 wdev = &sdata->wdev;
1497
1498                 sdata->dev = NULL;
1499                 strlcpy(sdata->name, name, IFNAMSIZ);
1500                 ieee80211_assign_perm_addr(local, wdev->address, type);
1501                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1502         } else {
1503                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1504                         txqs = IEEE80211_NUM_ACS;
1505
1506                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1507                                         local->hw.vif_data_size,
1508                                         name, ieee80211_if_setup, txqs, 1);
1509                 if (!ndev)
1510                         return -ENOMEM;
1511                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1512
1513                 ndev->needed_headroom = local->tx_headroom +
1514                                         4*6 /* four MAC addresses */
1515                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1516                                         + 6 /* mesh */
1517                                         + 8 /* rfc1042/bridge tunnel */
1518                                         - ETH_HLEN /* ethernet hard_header_len */
1519                                         + IEEE80211_ENCRYPT_HEADROOM;
1520                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1521
1522                 ret = dev_alloc_name(ndev, ndev->name);
1523                 if (ret < 0) {
1524                         free_netdev(ndev);
1525                         return ret;
1526                 }
1527
1528                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1529                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1530                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1531
1532                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1533                 sdata = netdev_priv(ndev);
1534                 ndev->ieee80211_ptr = &sdata->wdev;
1535                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1536                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1537
1538                 sdata->dev = ndev;
1539         }
1540
1541         /* initialise type-independent data */
1542         sdata->wdev.wiphy = local->hw.wiphy;
1543         sdata->local = local;
1544
1545         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1546                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1547
1548         INIT_LIST_HEAD(&sdata->key_list);
1549
1550         spin_lock_init(&sdata->cleanup_stations_lock);
1551         INIT_LIST_HEAD(&sdata->cleanup_stations);
1552         INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1553         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1554                           ieee80211_dfs_cac_timer_work);
1555         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1556                           ieee80211_delayed_tailroom_dec);
1557
1558         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1559                 struct ieee80211_supported_band *sband;
1560                 sband = local->hw.wiphy->bands[i];
1561                 sdata->rc_rateidx_mask[i] =
1562                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1563                 if (sband)
1564                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1565                                sband->ht_cap.mcs.rx_mask,
1566                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1567                 else
1568                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1569                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1570         }
1571
1572         ieee80211_set_default_queues(sdata);
1573
1574         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1575         sdata->user_power_level = local->user_power_level;
1576
1577         /* setup type-dependent data */
1578         ieee80211_setup_sdata(sdata, type);
1579
1580         if (ndev) {
1581                 if (params) {
1582                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1583                         if (type == NL80211_IFTYPE_STATION)
1584                                 sdata->u.mgd.use_4addr = params->use_4addr;
1585                 }
1586
1587                 ndev->features |= local->hw.netdev_features;
1588
1589                 ret = register_netdevice(ndev);
1590                 if (ret) {
1591                         free_netdev(ndev);
1592                         return ret;
1593                 }
1594         }
1595
1596         mutex_lock(&local->iflist_mtx);
1597         list_add_tail_rcu(&sdata->list, &local->interfaces);
1598         mutex_unlock(&local->iflist_mtx);
1599
1600         if (new_wdev)
1601                 *new_wdev = &sdata->wdev;
1602
1603         return 0;
1604 }
1605
1606 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1607 {
1608         ASSERT_RTNL();
1609
1610         mutex_lock(&sdata->local->iflist_mtx);
1611         list_del_rcu(&sdata->list);
1612         mutex_unlock(&sdata->local->iflist_mtx);
1613
1614         synchronize_rcu();
1615
1616         if (sdata->dev) {
1617                 unregister_netdevice(sdata->dev);
1618         } else {
1619                 cfg80211_unregister_wdev(&sdata->wdev);
1620                 kfree(sdata);
1621         }
1622 }
1623
1624 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1625 {
1626         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1627                 return;
1628         ieee80211_do_stop(sdata, true);
1629         ieee80211_teardown_sdata(sdata);
1630 }
1631
1632 /*
1633  * Remove all interfaces, may only be called at hardware unregistration
1634  * time because it doesn't do RCU-safe list removals.
1635  */
1636 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1637 {
1638         struct ieee80211_sub_if_data *sdata, *tmp;
1639         LIST_HEAD(unreg_list);
1640         LIST_HEAD(wdev_list);
1641
1642         ASSERT_RTNL();
1643
1644         mutex_lock(&local->iflist_mtx);
1645         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1646                 list_del(&sdata->list);
1647
1648                 if (sdata->dev)
1649                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1650                 else
1651                         list_add(&sdata->list, &wdev_list);
1652         }
1653         mutex_unlock(&local->iflist_mtx);
1654         unregister_netdevice_many(&unreg_list);
1655         list_del(&unreg_list);
1656
1657         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1658                 list_del(&sdata->list);
1659                 cfg80211_unregister_wdev(&sdata->wdev);
1660                 kfree(sdata);
1661         }
1662 }
1663
1664 static int netdev_notify(struct notifier_block *nb,
1665                          unsigned long state,
1666                          void *ndev)
1667 {
1668         struct net_device *dev = ndev;
1669         struct ieee80211_sub_if_data *sdata;
1670
1671         if (state != NETDEV_CHANGENAME)
1672                 return 0;
1673
1674         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1675                 return 0;
1676
1677         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1678                 return 0;
1679
1680         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1681
1682         memcpy(sdata->name, dev->name, IFNAMSIZ);
1683
1684         ieee80211_debugfs_rename_netdev(sdata);
1685         return 0;
1686 }
1687
1688 static struct notifier_block mac80211_netdev_notifier = {
1689         .notifier_call = netdev_notify,
1690 };
1691
1692 int ieee80211_iface_init(void)
1693 {
1694         return register_netdevice_notifier(&mac80211_netdev_notifier);
1695 }
1696
1697 void ieee80211_iface_exit(void)
1698 {
1699         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1700 }