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

   1 /*
   2  * Interface handling
   3  *
   4  * Copyright 2002-2005, Instant802 Networks, Inc.
   5  * Copyright 2005-2006, Devicescape Software, Inc.
   6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/if_arp.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/rtnetlink.h>
  18 #include <net/mac80211.h>
  19 #include <net/ieee80211_radiotap.h>
  20 #include "ieee80211_i.h"
  21 #include "sta_info.h"
  22 #include "debugfs_netdev.h"
  23 #include "mesh.h"
  24 #include "led.h"
  25 #include "driver-ops.h"
  26 #include "wme.h"
  27 #include "rate.h"
  28
  29 /**
  30  * DOC: Interface list locking
  31  *
  32  * The interface list in each struct ieee80211_local is protected
  33  * three-fold:
  34  *
  35  * (1) modifications may only be done under the RTNL
  36  * (2) modifications and readers are protected against each other by
  37  *     the iflist_mtx.
  38  * (3) modifications are done in an RCU manner so atomic readers
  39  *     can traverse the list in RCU-safe blocks.
  40  *
  41  * As a consequence, reads (traversals) of the list can be protected
  42  * by either the RTNL, the iflist_mtx or RCU.
  43  */
  44
  45 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  46 {
  47         struct ieee80211_chanctx_conf *chanctx_conf;
  48         int power;
  49
  50         rcu_read_lock();
  51         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  52         if (!chanctx_conf) {
  53                 rcu_read_unlock();
  54                 return false;
  55         }
  56
  57         power = ieee80211_chandef_max_power(&chanctx_conf->def);
  58         rcu_read_unlock();
  59
  60         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  61                 power = min(power, sdata->user_power_level);
  62
  63         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  64                 power = min(power, sdata->ap_power_level);
  65
  66         if (power != sdata->vif.bss_conf.txpower) {
  67                 sdata->vif.bss_conf.txpower = power;
  68                 ieee80211_hw_config(sdata->local, 0);
  69                 return true;
  70         }
  71
  72         return false;
  73 }
  74
  75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  76 {
  77         if (__ieee80211_recalc_txpower(sdata))
  78                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  79 }
  80
  81 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
  82 {
  83         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  84                 return 0;
  85
  86         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  87         return IEEE80211_CONF_CHANGE_IDLE;
  88 }
  89
  90 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  91 {
  92         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  93                 return 0;
  94
  95         ieee80211_flush_queues(local, NULL);
  96
  97         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
  98         return IEEE80211_CONF_CHANGE_IDLE;
  99 }
 100
 101 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
 102                                    bool force_active)
 103 {
 104         bool working = false, scanning, active;
 105         unsigned int led_trig_start = 0, led_trig_stop = 0;
 106         struct ieee80211_roc_work *roc;
 107
 108         lockdep_assert_held(&local->mtx);
 109
 110         active = force_active ||
 111                  !list_empty(&local->chanctx_list) ||
 112                  local->monitors;
 113
 114         if (!local->ops->remain_on_channel) {
 115                 list_for_each_entry(roc, &local->roc_list, list) {
 116                         working = true;
 117                         break;
 118                 }
 119         }
 120
 121         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 122                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 123
 124         if (working || scanning)
 125                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 126         else
 127                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 128
 129         if (active)
 130                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 131         else
 132                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 133
 134         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 135
 136         if (working || scanning || active)
 137                 return __ieee80211_idle_off(local);
 138         return __ieee80211_idle_on(local);
 139 }
 140
 141 u32 ieee80211_idle_off(struct ieee80211_local *local)
 142 {
 143         return __ieee80211_recalc_idle(local, true);
 144 }
 145
 146 void ieee80211_recalc_idle(struct ieee80211_local *local)
 147 {
 148         u32 change = __ieee80211_recalc_idle(local, false);
 149         if (change)
 150                 ieee80211_hw_config(local, change);
 151 }
 152
 153 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 154 {
 155         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
 156                 return -EINVAL;
 157
 158         dev->mtu = new_mtu;
 159         return 0;
 160 }
 161
 162 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 163                                 bool check_dup)
 164 {
 165         struct ieee80211_local *local = sdata->local;
 166         struct ieee80211_sub_if_data *iter;
 167         u64 new, mask, tmp;
 168         u8 *m;
 169         int ret = 0;
 170
 171         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 172                 return 0;
 173
 174         m = addr;
 175         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 176                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 177                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 178
 179         m = local->hw.wiphy->addr_mask;
 180         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 181                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 182                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 183
 184         if (!check_dup)
 185                 return ret;
 186
 187         mutex_lock(&local->iflist_mtx);
 188         list_for_each_entry(iter, &local->interfaces, list) {
 189                 if (iter == sdata)
 190                         continue;
 191
 192                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 193                     !(iter->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 194                         continue;
 195
 196                 m = iter->vif.addr;
 197                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 198                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 199                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 200
 201                 if ((new & ~mask) != (tmp & ~mask)) {
 202                         ret = -EINVAL;
 203                         break;
 204                 }
 205         }
 206         mutex_unlock(&local->iflist_mtx);
 207
 208         return ret;
 209 }
 210
 211 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 212 {
 213         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 214         struct sockaddr *sa = addr;
 215         bool check_dup = true;
 216         int ret;
 217
 218         if (ieee80211_sdata_running(sdata))
 219                 return -EBUSY;
 220
 221         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 222             !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 223                 check_dup = false;
 224
 225         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 226         if (ret)
 227                 return ret;
 228
 229         ret = eth_mac_addr(dev, sa);
 230
 231         if (ret == 0)
 232                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 233
 234         return ret;
 235 }
 236
 237 static inline int identical_mac_addr_allowed(int type1, int type2)
 238 {
 239         return type1 == NL80211_IFTYPE_MONITOR ||
 240                 type2 == NL80211_IFTYPE_MONITOR ||
 241                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 242                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 243                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 244                 (type1 == NL80211_IFTYPE_WDS &&
 245                         (type2 == NL80211_IFTYPE_WDS ||
 246                          type2 == NL80211_IFTYPE_AP)) ||
 247                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 248                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 249                         (type2 == NL80211_IFTYPE_AP ||
 250                          type2 == NL80211_IFTYPE_AP_VLAN));
 251 }
 252
 253 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 254                                             enum nl80211_iftype iftype)
 255 {
 256         struct ieee80211_local *local = sdata->local;
 257         struct ieee80211_sub_if_data *nsdata;
 258
 259         ASSERT_RTNL();
 260
 261         /* we hold the RTNL here so can safely walk the list */
 262         list_for_each_entry(nsdata, &local->interfaces, list) {
 263                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 264                         /*
 265                          * Allow only a single IBSS interface to be up at any
 266                          * time. This is restricted because beacon distribution
 267                          * cannot work properly if both are in the same IBSS.
 268                          *
 269                          * To remove this restriction we'd have to disallow them
 270                          * from setting the same SSID on different IBSS interfaces
 271                          * belonging to the same hardware. Then, however, we're
 272                          * faced with having to adopt two different TSF timers...
 273                          */
 274                         if (iftype == NL80211_IFTYPE_ADHOC &&
 275                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 276                                 return -EBUSY;
 277                         /*
 278                          * will not add another interface while any channel
 279                          * switch is active.
 280                          */
 281                         if (nsdata->vif.csa_active)
 282                                 return -EBUSY;
 283
 284                         /*
 285                          * The remaining checks are only performed for interfaces
 286                          * with the same MAC address.
 287                          */
 288                         if (!ether_addr_equal(sdata->vif.addr,
 289                                               nsdata->vif.addr))
 290                                 continue;
 291
 292                         /*
 293                          * check whether it may have the same address
 294                          */
 295                         if (!identical_mac_addr_allowed(iftype,
 296                                                         nsdata->vif.type))
 297                                 return -ENOTUNIQ;
 298
 299                         /*
 300                          * can only add VLANs to enabled APs
 301                          */
 302                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 303                             nsdata->vif.type == NL80211_IFTYPE_AP)
 304                                 sdata->bss = &nsdata->u.ap;
 305                 }
 306         }
 307
 308         return 0;
 309 }
 310
 311 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 312                                   enum nl80211_iftype iftype)
 313 {
 314         int n_queues = sdata->local->hw.queues;
 315         int i;
 316
 317         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 318                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 319                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 320                                          IEEE80211_INVAL_HW_QUEUE))
 321                                 return -EINVAL;
 322                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 323                                          n_queues))
 324                                 return -EINVAL;
 325                 }
 326         }
 327
 328         if ((iftype != NL80211_IFTYPE_AP &&
 329              iftype != NL80211_IFTYPE_P2P_GO &&
 330              iftype != NL80211_IFTYPE_MESH_POINT) ||
 331             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
 332                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 333                 return 0;
 334         }
 335
 336         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 337                 return -EINVAL;
 338
 339         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 340                 return -EINVAL;
 341
 342         return 0;
 343 }
 344
 345 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 346                                     const int offset)
 347 {
 348         struct ieee80211_local *local = sdata->local;
 349         u32 flags = sdata->u.mntr_flags;
 350
 351 #define ADJUST(_f, _s)  do {                                    \
 352         if (flags & MONITOR_FLAG_##_f)                          \
 353                 local->fif_##_s += offset;                      \
 354         } while (0)
 355
 356         ADJUST(FCSFAIL, fcsfail);
 357         ADJUST(PLCPFAIL, plcpfail);
 358         ADJUST(CONTROL, control);
 359         ADJUST(CONTROL, pspoll);
 360         ADJUST(OTHER_BSS, other_bss);
 361
 362 #undef ADJUST
 363 }
 364
 365 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 366 {
 367         struct ieee80211_local *local = sdata->local;
 368         int i;
 369
 370         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 371                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
 372                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 373                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 374                         sdata->vif.hw_queue[i] = i;
 375                 else
 376                         sdata->vif.hw_queue[i] = 0;
 377         }
 378         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 379 }
 380
 381 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 382 {
 383         struct ieee80211_sub_if_data *sdata;
 384         int ret;
 385
 386         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 387                 return 0;
 388
 389         ASSERT_RTNL();
 390
 391         if (local->monitor_sdata)
 392                 return 0;
 393
 394         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 395         if (!sdata)
 396                 return -ENOMEM;
 397
 398         /* set up data */
 399         sdata->local = local;
 400         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 401         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 402                  wiphy_name(local->hw.wiphy));
 403
 404         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 405
 406         ieee80211_set_default_queues(sdata);
 407
 408         ret = drv_add_interface(local, sdata);
 409         if (WARN_ON(ret)) {
 410                 /* ok .. stupid driver, it asked for this! */
 411                 kfree(sdata);
 412                 return ret;
 413         }
 414
 415         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 416         if (ret) {
 417                 kfree(sdata);
 418                 return ret;
 419         }
 420
 421         mutex_lock(&local->mtx);
 422         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 423                                         IEEE80211_CHANCTX_EXCLUSIVE);
 424         mutex_unlock(&local->mtx);
 425         if (ret) {
 426                 drv_remove_interface(local, sdata);
 427                 kfree(sdata);
 428                 return ret;
 429         }
 430
 431         mutex_lock(&local->iflist_mtx);
 432         rcu_assign_pointer(local->monitor_sdata, sdata);
 433         mutex_unlock(&local->iflist_mtx);
 434
 435         return 0;
 436 }
 437
 438 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 439 {
 440         struct ieee80211_sub_if_data *sdata;
 441
 442         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 443                 return;
 444
 445         ASSERT_RTNL();
 446
 447         mutex_lock(&local->iflist_mtx);
 448
 449         sdata = rcu_dereference_protected(local->monitor_sdata,
 450                                           lockdep_is_held(&local->iflist_mtx));
 451         if (!sdata) {
 452                 mutex_unlock(&local->iflist_mtx);
 453                 return;
 454         }
 455
 456         rcu_assign_pointer(local->monitor_sdata, NULL);
 457         mutex_unlock(&local->iflist_mtx);
 458
 459         synchronize_net();
 460
 461         mutex_lock(&local->mtx);
 462         ieee80211_vif_release_channel(sdata);
 463         mutex_unlock(&local->mtx);
 464
 465         drv_remove_interface(local, sdata);
 466
 467         kfree(sdata);
 468 }
 469
 470 /*
 471  * NOTE: Be very careful when changing this function, it must NOT return
 472  * an error on interface type changes that have been pre-checked, so most
 473  * checks should be in ieee80211_check_concurrent_iface.
 474  */
 475 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 476 {
 477         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 478         struct net_device *dev = wdev->netdev;
 479         struct ieee80211_local *local = sdata->local;
 480         struct sta_info *sta;
 481         u32 changed = 0;
 482         int res;
 483         u32 hw_reconf_flags = 0;
 484
 485         switch (sdata->vif.type) {
 486         case NL80211_IFTYPE_WDS:
 487                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 488                         return -ENOLINK;
 489                 break;
 490         case NL80211_IFTYPE_AP_VLAN: {
 491                 struct ieee80211_sub_if_data *master;
 492
 493                 if (!sdata->bss)
 494                         return -ENOLINK;
 495
 496                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 497
 498                 master = container_of(sdata->bss,
 499                                       struct ieee80211_sub_if_data, u.ap);
 500                 sdata->control_port_protocol =
 501                         master->control_port_protocol;
 502                 sdata->control_port_no_encrypt =
 503                         master->control_port_no_encrypt;
 504                 sdata->vif.cab_queue = master->vif.cab_queue;
 505                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
 506                        sizeof(sdata->vif.hw_queue));
 507                 break;
 508                 }
 509         case NL80211_IFTYPE_AP:
 510                 sdata->bss = &sdata->u.ap;
 511                 break;
 512         case NL80211_IFTYPE_MESH_POINT:
 513         case NL80211_IFTYPE_STATION:
 514         case NL80211_IFTYPE_MONITOR:
 515         case NL80211_IFTYPE_ADHOC:
 516         case NL80211_IFTYPE_P2P_DEVICE:
 517                 /* no special treatment */
 518                 break;
 519         case NL80211_IFTYPE_UNSPECIFIED:
 520         case NUM_NL80211_IFTYPES:
 521         case NL80211_IFTYPE_P2P_CLIENT:
 522         case NL80211_IFTYPE_P2P_GO:
 523                 /* cannot happen */
 524                 WARN_ON(1);
 525                 break;
 526         }
 527
 528         if (local->open_count == 0) {
 529                 res = drv_start(local);
 530                 if (res)
 531                         goto err_del_bss;
 532                 /* we're brought up, everything changes */
 533                 hw_reconf_flags = ~0;
 534                 ieee80211_led_radio(local, true);
 535                 ieee80211_mod_tpt_led_trig(local,
 536                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 537         }
 538
 539         /*
 540          * Copy the hopefully now-present MAC address to
 541          * this interface, if it has the special null one.
 542          */
 543         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 544                 memcpy(dev->dev_addr,
 545                        local->hw.wiphy->perm_addr,
 546                        ETH_ALEN);
 547                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 548
 549                 if (!is_valid_ether_addr(dev->dev_addr)) {
 550                         res = -EADDRNOTAVAIL;
 551                         goto err_stop;
 552                 }
 553         }
 554
 555         switch (sdata->vif.type) {
 556         case NL80211_IFTYPE_AP_VLAN:
 557                 /* no need to tell driver, but set carrier and chanctx */
 558                 if (rtnl_dereference(sdata->bss->beacon)) {
 559                         ieee80211_vif_vlan_copy_chanctx(sdata);
 560                         netif_carrier_on(dev);
 561                 } else {
 562                         netif_carrier_off(dev);
 563                 }
 564                 break;
 565         case NL80211_IFTYPE_MONITOR:
 566                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 567                         local->cooked_mntrs++;
 568                         break;
 569                 }
 570
 571                 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
 572                         res = drv_add_interface(local, sdata);
 573                         if (res)
 574                                 goto err_stop;
 575                 } else if (local->monitors == 0 && local->open_count == 0) {
 576                         res = ieee80211_add_virtual_monitor(local);
 577                         if (res)
 578                                 goto err_stop;
 579                 }
 580
 581                 /* must be before the call to ieee80211_configure_filter */
 582                 local->monitors++;
 583                 if (local->monitors == 1) {
 584                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 585                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 586                 }
 587
 588                 ieee80211_adjust_monitor_flags(sdata, 1);
 589                 ieee80211_configure_filter(local);
 590                 mutex_lock(&local->mtx);
 591                 ieee80211_recalc_idle(local);
 592                 mutex_unlock(&local->mtx);
 593
 594                 netif_carrier_on(dev);
 595                 break;
 596         default:
 597                 if (coming_up) {
 598                         ieee80211_del_virtual_monitor(local);
 599
 600                         res = drv_add_interface(local, sdata);
 601                         if (res)
 602                                 goto err_stop;
 603                         res = ieee80211_check_queues(sdata,
 604                                 ieee80211_vif_type_p2p(&sdata->vif));
 605                         if (res)
 606                                 goto err_del_interface;
 607                 }
 608
 609                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 610                         local->fif_pspoll++;
 611                         local->fif_probe_req++;
 612
 613                         ieee80211_configure_filter(local);
 614                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 615                         local->fif_probe_req++;
 616                 }
 617
 618                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 619                         changed |= ieee80211_reset_erp_info(sdata);
 620                 ieee80211_bss_info_change_notify(sdata, changed);
 621
 622                 switch (sdata->vif.type) {
 623                 case NL80211_IFTYPE_STATION:
 624                 case NL80211_IFTYPE_ADHOC:
 625                 case NL80211_IFTYPE_AP:
 626                 case NL80211_IFTYPE_MESH_POINT:
 627                         netif_carrier_off(dev);
 628                         break;
 629                 case NL80211_IFTYPE_WDS:
 630                 case NL80211_IFTYPE_P2P_DEVICE:
 631                         break;
 632                 default:
 633                         /* not reached */
 634                         WARN_ON(1);
 635                 }
 636
 637                 /*
 638                  * set default queue parameters so drivers don't
 639                  * need to initialise the hardware if the hardware
 640                  * doesn't start up with sane defaults
 641                  */
 642                 ieee80211_set_wmm_default(sdata, true);
 643         }
 644
 645         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 646
 647         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 648                 /* Create STA entry for the WDS peer */
 649                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 650                                      GFP_KERNEL);
 651                 if (!sta) {
 652                         res = -ENOMEM;
 653                         goto err_del_interface;
 654                 }
 655
 656                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 657                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 658                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 659
 660                 res = sta_info_insert(sta);
 661                 if (res) {
 662                         /* STA has been freed */
 663                         goto err_del_interface;
 664                 }
 665
 666                 rate_control_rate_init(sta);
 667                 netif_carrier_on(dev);
 668         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 669                 rcu_assign_pointer(local->p2p_sdata, sdata);
 670         }
 671
 672         /*
 673          * set_multicast_list will be invoked by the networking core
 674          * which will check whether any increments here were done in
 675          * error and sync them down to the hardware as filter flags.
 676          */
 677         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 678                 atomic_inc(&local->iff_allmultis);
 679
 680         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 681                 atomic_inc(&local->iff_promiscs);
 682
 683         if (coming_up)
 684                 local->open_count++;
 685
 686         if (hw_reconf_flags)
 687                 ieee80211_hw_config(local, hw_reconf_flags);
 688
 689         ieee80211_recalc_ps(local, -1);
 690
 691         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 692             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 693                 /* XXX: for AP_VLAN, actually track AP queues */
 694                 netif_tx_start_all_queues(dev);
 695         } else if (dev) {
 696                 unsigned long flags;
 697                 int n_acs = IEEE80211_NUM_ACS;
 698                 int ac;
 699
 700                 if (local->hw.queues < IEEE80211_NUM_ACS)
 701                         n_acs = 1;
 702
 703                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 704                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 705                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 706                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 707                         for (ac = 0; ac < n_acs; ac++) {
 708                                 int ac_queue = sdata->vif.hw_queue[ac];
 709
 710                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 711                                     skb_queue_empty(&local->pending[ac_queue]))
 712                                         netif_start_subqueue(dev, ac);
 713                         }
 714                 }
 715                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 716         }
 717
 718         return 0;
 719  err_del_interface:
 720         drv_remove_interface(local, sdata);
 721  err_stop:
 722         if (!local->open_count)
 723                 drv_stop(local);
 724  err_del_bss:
 725         sdata->bss = NULL;
 726         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 727                 list_del(&sdata->u.vlan.list);
 728         /* might already be clear but that doesn't matter */
 729         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 730         return res;
 731 }
 732
 733 static int ieee80211_open(struct net_device *dev)
 734 {
 735         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 736         int err;
 737
 738         /* fail early if user set an invalid address */
 739         if (!is_valid_ether_addr(dev->dev_addr))
 740                 return -EADDRNOTAVAIL;
 741
 742         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 743         if (err)
 744                 return err;
 745
 746         return ieee80211_do_open(&sdata->wdev, true);
 747 }
 748
 749 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 750                               bool going_down)
 751 {
 752         struct ieee80211_local *local = sdata->local;
 753         unsigned long flags;
 754         struct sk_buff *skb, *tmp;
 755         u32 hw_reconf_flags = 0;
 756         int i, flushed;
 757         struct ps_data *ps;
 758         struct cfg80211_chan_def chandef;
 759
 760         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 761
 762         if (rcu_access_pointer(local->scan_sdata) == sdata)
 763                 ieee80211_scan_cancel(local);
 764
 765         /*
 766          * Stop TX on this interface first.
 767          */
 768         if (sdata->dev)
 769                 netif_tx_stop_all_queues(sdata->dev);
 770
 771         ieee80211_roc_purge(local, sdata);
 772
 773         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 774                 ieee80211_mgd_stop(sdata);
 775
 776         if (sdata->vif.type == NL80211_IFTYPE_ADHOC)
 777                 ieee80211_ibss_stop(sdata);
 778
 779
 780         /*
 781          * Remove all stations associated with this interface.
 782          *
 783          * This must be done before calling ops->remove_interface()
 784          * because otherwise we can later invoke ops->sta_notify()
 785          * whenever the STAs are removed, and that invalidates driver
 786          * assumptions about always getting a vif pointer that is valid
 787          * (because if we remove a STA after ops->remove_interface()
 788          * the driver will have removed the vif info already!)
 789          *
 790          * This is relevant only in WDS mode, in all other modes we've
 791          * already removed all stations when disconnecting or similar,
 792          * so warn otherwise.
 793          */
 794         flushed = sta_info_flush(sdata);
 795         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 796                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
 797
 798         /* don't count this interface for promisc/allmulti while it is down */
 799         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 800                 atomic_dec(&local->iff_allmultis);
 801
 802         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 803                 atomic_dec(&local->iff_promiscs);
 804
 805         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 806                 local->fif_pspoll--;
 807                 local->fif_probe_req--;
 808         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 809                 local->fif_probe_req--;
 810         }
 811
 812         if (sdata->dev) {
 813                 netif_addr_lock_bh(sdata->dev);
 814                 spin_lock_bh(&local->filter_lock);
 815                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 816                                  sdata->dev->addr_len);
 817                 spin_unlock_bh(&local->filter_lock);
 818                 netif_addr_unlock_bh(sdata->dev);
 819         }
 820
 821         del_timer_sync(&local->dynamic_ps_timer);
 822         cancel_work_sync(&local->dynamic_ps_enable_work);
 823
 824         cancel_work_sync(&sdata->recalc_smps);
 825         sdata->vif.csa_active = false;
 826         cancel_work_sync(&sdata->csa_finalize_work);
 827
 828         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 829
 830         if (sdata->wdev.cac_started) {
 831                 chandef = sdata->vif.bss_conf.chandef;
 832                 WARN_ON(local->suspended);
 833                 mutex_lock(&local->mtx);
 834                 ieee80211_vif_release_channel(sdata);
 835                 mutex_unlock(&local->mtx);
 836                 cfg80211_cac_event(sdata->dev, &chandef,
 837                                    NL80211_RADAR_CAC_ABORTED,
 838                                    GFP_KERNEL);
 839         }
 840
 841         /* APs need special treatment */
 842         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 843                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 844
 845                 /* down all dependent devices, that is VLANs */
 846                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 847                                          u.vlan.list)
 848                         dev_close(vlan->dev);
 849                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 850         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 851                 /* remove all packets in parent bc_buf pointing to this dev */
 852                 ps = &sdata->bss->ps;
 853
 854                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 855                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 856                         if (skb->dev == sdata->dev) {
 857                                 __skb_unlink(skb, &ps->bc_buf);
 858                                 local->total_ps_buffered--;
 859                                 ieee80211_free_txskb(&local->hw, skb);
 860                         }
 861                 }
 862                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 863         }
 864
 865         if (going_down)
 866                 local->open_count--;
 867
 868         switch (sdata->vif.type) {
 869         case NL80211_IFTYPE_AP_VLAN:
 870                 list_del(&sdata->u.vlan.list);
 871                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
 872                 /* no need to tell driver */
 873                 break;
 874         case NL80211_IFTYPE_MONITOR:
 875                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 876                         local->cooked_mntrs--;
 877                         break;
 878                 }
 879
 880                 local->monitors--;
 881                 if (local->monitors == 0) {
 882                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 883                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 884                 }
 885
 886                 ieee80211_adjust_monitor_flags(sdata, -1);
 887                 break;
 888         case NL80211_IFTYPE_P2P_DEVICE:
 889                 /* relies on synchronize_rcu() below */
 890                 rcu_assign_pointer(local->p2p_sdata, NULL);
 891                 /* fall through */
 892         default:
 893                 cancel_work_sync(&sdata->work);
 894                 /*
 895                  * When we get here, the interface is marked down.
 896                  * Free the remaining keys, if there are any
 897                  * (shouldn't be, except maybe in WDS mode?)
 898                  *
 899                  * Force the key freeing to always synchronize_net()
 900                  * to wait for the RX path in case it is using this
 901                  * interface enqueuing frames * at this very time on
 902                  * another CPU.
 903                  */
 904                 ieee80211_free_keys(sdata, true);
 905
 906                 /* fall through */
 907         case NL80211_IFTYPE_AP:
 908                 skb_queue_purge(&sdata->skb_queue);
 909         }
 910
 911         sdata->bss = NULL;
 912
 913         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 914         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 915                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 916                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 917                         if (info->control.vif == &sdata->vif) {
 918                                 __skb_unlink(skb, &local->pending[i]);
 919                                 ieee80211_free_txskb(&local->hw, skb);
 920                         }
 921                 }
 922         }
 923         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 924
 925         if (local->open_count == 0)
 926                 ieee80211_clear_tx_pending(local);
 927
 928         /*
 929          * If the interface goes down while suspended, presumably because
 930          * the device was unplugged and that happens before our resume,
 931          * then the driver is already unconfigured and the remainder of
 932          * this function isn't needed.
 933          * XXX: what about WoWLAN? If the device has software state, e.g.
 934          *      memory allocated, it might expect teardown commands from
 935          *      mac80211 here?
 936          */
 937         if (local->suspended) {
 938                 WARN_ON(local->wowlan);
 939                 WARN_ON(rtnl_dereference(local->monitor_sdata));
 940                 return;
 941         }
 942
 943         switch (sdata->vif.type) {
 944         case NL80211_IFTYPE_AP_VLAN:
 945                 break;
 946         case NL80211_IFTYPE_MONITOR:
 947                 if (local->monitors == 0)
 948                         ieee80211_del_virtual_monitor(local);
 949
 950                 mutex_lock(&local->mtx);
 951                 ieee80211_recalc_idle(local);
 952                 mutex_unlock(&local->mtx);
 953
 954                 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 955                         break;
 956
 957                 /* fall through */
 958         default:
 959                 if (going_down)
 960                         drv_remove_interface(local, sdata);
 961         }
 962
 963         ieee80211_recalc_ps(local, -1);
 964
 965         if (local->open_count == 0) {
 966                 ieee80211_stop_device(local);
 967
 968                 /* no reconfiguring after stop! */
 969                 return;
 970         }
 971
 972         /* do after stop to avoid reconfiguring when we stop anyway */
 973         ieee80211_configure_filter(local);
 974         ieee80211_hw_config(local, hw_reconf_flags);
 975
 976         if (local->monitors == local->open_count)
 977                 ieee80211_add_virtual_monitor(local);
 978 }
 979
 980 static int ieee80211_stop(struct net_device *dev)
 981 {
 982         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 983
 984         ieee80211_do_stop(sdata, true);
 985
 986         return 0;
 987 }
 988
 989 static void ieee80211_set_multicast_list(struct net_device *dev)
 990 {
 991         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 992         struct ieee80211_local *local = sdata->local;
 993         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 994
 995         allmulti = !!(dev->flags & IFF_ALLMULTI);
 996         promisc = !!(dev->flags & IFF_PROMISC);
 997         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 998         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 999
1000         if (allmulti != sdata_allmulti) {
1001                 if (dev->flags & IFF_ALLMULTI)
1002                         atomic_inc(&local->iff_allmultis);
1003                 else
1004                         atomic_dec(&local->iff_allmultis);
1005                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1006         }
1007
1008         if (promisc != sdata_promisc) {
1009                 if (dev->flags & IFF_PROMISC)
1010                         atomic_inc(&local->iff_promiscs);
1011                 else
1012                         atomic_dec(&local->iff_promiscs);
1013                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
1014         }
1015         spin_lock_bh(&local->filter_lock);
1016         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1017         spin_unlock_bh(&local->filter_lock);
1018         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1019 }
1020
1021 /*
1022  * Called when the netdev is removed or, by the code below, before
1023  * the interface type changes.
1024  */
1025 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1026 {
1027         int i;
1028
1029         /* free extra data */
1030         ieee80211_free_keys(sdata, false);
1031
1032         ieee80211_debugfs_remove_netdev(sdata);
1033
1034         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1035                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1036         sdata->fragment_next = 0;
1037
1038         if (ieee80211_vif_is_mesh(&sdata->vif))
1039                 mesh_rmc_free(sdata);
1040 }
1041
1042 static void ieee80211_uninit(struct net_device *dev)
1043 {
1044         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1045 }
1046
1047 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1048                                          struct sk_buff *skb)
1049 {
1050         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1051 }
1052
1053 static const struct net_device_ops ieee80211_dataif_ops = {
1054         .ndo_open               = ieee80211_open,
1055         .ndo_stop               = ieee80211_stop,
1056         .ndo_uninit             = ieee80211_uninit,
1057         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1058         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1059         .ndo_change_mtu         = ieee80211_change_mtu,
1060         .ndo_set_mac_address    = ieee80211_change_mac,
1061         .ndo_select_queue       = ieee80211_netdev_select_queue,
1062 };
1063
1064 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1065                                           struct sk_buff *skb)
1066 {
1067         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1068         struct ieee80211_local *local = sdata->local;
1069         struct ieee80211_hdr *hdr;
1070         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1071
1072         if (local->hw.queues < IEEE80211_NUM_ACS)
1073                 return 0;
1074
1075         if (skb->len < 4 ||
1076             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1077                 return 0; /* doesn't matter, frame will be dropped */
1078
1079         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1080
1081         return ieee80211_select_queue_80211(sdata, skb, hdr);
1082 }
1083
1084 static const struct net_device_ops ieee80211_monitorif_ops = {
1085         .ndo_open               = ieee80211_open,
1086         .ndo_stop               = ieee80211_stop,
1087         .ndo_uninit             = ieee80211_uninit,
1088         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1089         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1090         .ndo_change_mtu         = ieee80211_change_mtu,
1091         .ndo_set_mac_address    = ieee80211_change_mac,
1092         .ndo_select_queue       = ieee80211_monitor_select_queue,
1093 };
1094
1095 static void ieee80211_if_setup(struct net_device *dev)
1096 {
1097         ether_setup(dev);
1098         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1099         dev->netdev_ops = &ieee80211_dataif_ops;
1100         dev->destructor = free_netdev;
1101 }
1102
1103 static void ieee80211_iface_work(struct work_struct *work)
1104 {
1105         struct ieee80211_sub_if_data *sdata =
1106                 container_of(work, struct ieee80211_sub_if_data, work);
1107         struct ieee80211_local *local = sdata->local;
1108         struct sk_buff *skb;
1109         struct sta_info *sta;
1110         struct ieee80211_ra_tid *ra_tid;
1111
1112         if (!ieee80211_sdata_running(sdata))
1113                 return;
1114
1115         if (local->scanning)
1116                 return;
1117
1118         /*
1119          * ieee80211_queue_work() should have picked up most cases,
1120          * here we'll pick the rest.
1121          */
1122         if (WARN(local->suspended,
1123                  "interface work scheduled while going to suspend\n"))
1124                 return;
1125
1126         /* first process frames */
1127         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1128                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1129
1130                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1131                         ra_tid = (void *)&skb->cb;
1132                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1133                                                  ra_tid->tid);
1134                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1135                         ra_tid = (void *)&skb->cb;
1136                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1137                                                 ra_tid->tid);
1138                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1139                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1140                         int len = skb->len;
1141
1142                         mutex_lock(&local->sta_mtx);
1143                         sta = sta_info_get_bss(sdata, mgmt->sa);
1144                         if (sta) {
1145                                 switch (mgmt->u.action.u.addba_req.action_code) {
1146                                 case WLAN_ACTION_ADDBA_REQ:
1147                                         ieee80211_process_addba_request(
1148                                                         local, sta, mgmt, len);
1149                                         break;
1150                                 case WLAN_ACTION_ADDBA_RESP:
1151                                         ieee80211_process_addba_resp(local, sta,
1152                                                                      mgmt, len);
1153                                         break;
1154                                 case WLAN_ACTION_DELBA:
1155                                         ieee80211_process_delba(sdata, sta,
1156                                                                 mgmt, len);
1157                                         break;
1158                                 default:
1159                                         WARN_ON(1);
1160                                         break;
1161                                 }
1162                         }
1163                         mutex_unlock(&local->sta_mtx);
1164                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1165                         struct ieee80211_hdr *hdr = (void *)mgmt;
1166                         /*
1167                          * So the frame isn't mgmt, but frame_control
1168                          * is at the right place anyway, of course, so
1169                          * the if statement is correct.
1170                          *
1171                          * Warn if we have other data frame types here,
1172                          * they must not get here.
1173                          */
1174                         WARN_ON(hdr->frame_control &
1175                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1176                         WARN_ON(!(hdr->seq_ctrl &
1177                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1178                         /*
1179                          * This was a fragment of a frame, received while
1180                          * a block-ack session was active. That cannot be
1181                          * right, so terminate the session.
1182                          */
1183                         mutex_lock(&local->sta_mtx);
1184                         sta = sta_info_get_bss(sdata, mgmt->sa);
1185                         if (sta) {
1186                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1187                                                 IEEE80211_QOS_CTL_TID_MASK;
1188
1189                                 __ieee80211_stop_rx_ba_session(
1190                                         sta, tid, WLAN_BACK_RECIPIENT,
1191                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1192                                         true);
1193                         }
1194                         mutex_unlock(&local->sta_mtx);
1195                 } else switch (sdata->vif.type) {
1196                 case NL80211_IFTYPE_STATION:
1197                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1198                         break;
1199                 case NL80211_IFTYPE_ADHOC:
1200                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1201                         break;
1202                 case NL80211_IFTYPE_MESH_POINT:
1203                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1204                                 break;
1205                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1206                         break;
1207                 default:
1208                         WARN(1, "frame for unexpected interface type");
1209                         break;
1210                 }
1211
1212                 kfree_skb(skb);
1213         }
1214
1215         /* then other type-dependent work */
1216         switch (sdata->vif.type) {
1217         case NL80211_IFTYPE_STATION:
1218                 ieee80211_sta_work(sdata);
1219                 break;
1220         case NL80211_IFTYPE_ADHOC:
1221                 ieee80211_ibss_work(sdata);
1222                 break;
1223         case NL80211_IFTYPE_MESH_POINT:
1224                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1225                         break;
1226                 ieee80211_mesh_work(sdata);
1227                 break;
1228         default:
1229                 break;
1230         }
1231 }
1232
1233 static void ieee80211_recalc_smps_work(struct work_struct *work)
1234 {
1235         struct ieee80211_sub_if_data *sdata =
1236                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1237
1238         ieee80211_recalc_smps(sdata);
1239 }
1240
1241 /*
1242  * Helper function to initialise an interface to a specific type.
1243  */
1244 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1245                                   enum nl80211_iftype type)
1246 {
1247         /* clear type-dependent union */
1248         memset(&sdata->u, 0, sizeof(sdata->u));
1249
1250         /* and set some type-dependent values */
1251         sdata->vif.type = type;
1252         sdata->vif.p2p = false;
1253         sdata->wdev.iftype = type;
1254
1255         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1256         sdata->control_port_no_encrypt = false;
1257         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1258
1259         sdata->noack_map = 0;
1260
1261         /* only monitor/p2p-device differ */
1262         if (sdata->dev) {
1263                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1264                 sdata->dev->type = ARPHRD_ETHER;
1265         }
1266
1267         skb_queue_head_init(&sdata->skb_queue);
1268         INIT_WORK(&sdata->work, ieee80211_iface_work);
1269         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1270         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1271
1272         switch (type) {
1273         case NL80211_IFTYPE_P2P_GO:
1274                 type = NL80211_IFTYPE_AP;
1275                 sdata->vif.type = type;
1276                 sdata->vif.p2p = true;
1277                 /* fall through */
1278         case NL80211_IFTYPE_AP:
1279                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1280                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1281                 INIT_WORK(&sdata->u.ap.request_smps_work,
1282                           ieee80211_request_smps_ap_work);
1283                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1284                 sdata->u.ap.req_smps = IEEE80211_SMPS_OFF;
1285                 break;
1286         case NL80211_IFTYPE_P2P_CLIENT:
1287                 type = NL80211_IFTYPE_STATION;
1288                 sdata->vif.type = type;
1289                 sdata->vif.p2p = true;
1290                 /* fall through */
1291         case NL80211_IFTYPE_STATION:
1292                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1293                 ieee80211_sta_setup_sdata(sdata);
1294                 break;
1295         case NL80211_IFTYPE_ADHOC:
1296                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1297                 ieee80211_ibss_setup_sdata(sdata);
1298                 break;
1299         case NL80211_IFTYPE_MESH_POINT:
1300                 if (ieee80211_vif_is_mesh(&sdata->vif))
1301                         ieee80211_mesh_init_sdata(sdata);
1302                 break;
1303         case NL80211_IFTYPE_MONITOR:
1304                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1305                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1306                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1307                                       MONITOR_FLAG_OTHER_BSS;
1308                 break;
1309         case NL80211_IFTYPE_WDS:
1310                 sdata->vif.bss_conf.bssid = NULL;
1311                 break;
1312         case NL80211_IFTYPE_AP_VLAN:
1313         case NL80211_IFTYPE_P2P_DEVICE:
1314                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1315                 break;
1316         case NL80211_IFTYPE_UNSPECIFIED:
1317         case NUM_NL80211_IFTYPES:
1318                 BUG();
1319                 break;
1320         }
1321
1322         ieee80211_debugfs_add_netdev(sdata);
1323 }
1324
1325 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1326                                            enum nl80211_iftype type)
1327 {
1328         struct ieee80211_local *local = sdata->local;
1329         int ret, err;
1330         enum nl80211_iftype internal_type = type;
1331         bool p2p = false;
1332
1333         ASSERT_RTNL();
1334
1335         if (!local->ops->change_interface)
1336                 return -EBUSY;
1337
1338         switch (sdata->vif.type) {
1339         case NL80211_IFTYPE_AP:
1340         case NL80211_IFTYPE_STATION:
1341         case NL80211_IFTYPE_ADHOC:
1342                 /*
1343                  * Could maybe also all others here?
1344                  * Just not sure how that interacts
1345                  * with the RX/config path e.g. for
1346                  * mesh.
1347                  */
1348                 break;
1349         default:
1350                 return -EBUSY;
1351         }
1352
1353         switch (type) {
1354         case NL80211_IFTYPE_AP:
1355         case NL80211_IFTYPE_STATION:
1356         case NL80211_IFTYPE_ADHOC:
1357                 /*
1358                  * Could probably support everything
1359                  * but WDS here (WDS do_open can fail
1360                  * under memory pressure, which this
1361                  * code isn't prepared to handle).
1362                  */
1363                 break;
1364         case NL80211_IFTYPE_P2P_CLIENT:
1365                 p2p = true;
1366                 internal_type = NL80211_IFTYPE_STATION;
1367                 break;
1368         case NL80211_IFTYPE_P2P_GO:
1369                 p2p = true;
1370                 internal_type = NL80211_IFTYPE_AP;
1371                 break;
1372         default:
1373                 return -EBUSY;
1374         }
1375
1376         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1377         if (ret)
1378                 return ret;
1379
1380         ieee80211_do_stop(sdata, false);
1381
1382         ieee80211_teardown_sdata(sdata);
1383
1384         ret = drv_change_interface(local, sdata, internal_type, p2p);
1385         if (ret)
1386                 type = ieee80211_vif_type_p2p(&sdata->vif);
1387
1388         /*
1389          * Ignore return value here, there's not much we can do since
1390          * the driver changed the interface type internally already.
1391          * The warnings will hopefully make driver authors fix it :-)
1392          */
1393         ieee80211_check_queues(sdata, type);
1394
1395         ieee80211_setup_sdata(sdata, type);
1396
1397         err = ieee80211_do_open(&sdata->wdev, false);
1398         WARN(err, "type change: do_open returned %d", err);
1399
1400         return ret;
1401 }
1402
1403 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1404                              enum nl80211_iftype type)
1405 {
1406         int ret;
1407
1408         ASSERT_RTNL();
1409
1410         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1411                 return 0;
1412
1413         if (ieee80211_sdata_running(sdata)) {
1414                 ret = ieee80211_runtime_change_iftype(sdata, type);
1415                 if (ret)
1416                         return ret;
1417         } else {
1418                 /* Purge and reset type-dependent state. */
1419                 ieee80211_teardown_sdata(sdata);
1420                 ieee80211_setup_sdata(sdata, type);
1421         }
1422
1423         /* reset some values that shouldn't be kept across type changes */
1424         sdata->drop_unencrypted = 0;
1425         if (type == NL80211_IFTYPE_STATION)
1426                 sdata->u.mgd.use_4addr = false;
1427
1428         return 0;
1429 }
1430
1431 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1432                                        u8 *perm_addr, enum nl80211_iftype type)
1433 {
1434         struct ieee80211_sub_if_data *sdata;
1435         u64 mask, start, addr, val, inc;
1436         u8 *m;
1437         u8 tmp_addr[ETH_ALEN];
1438         int i;
1439
1440         /* default ... something at least */
1441         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1442
1443         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1444             local->hw.wiphy->n_addresses <= 1)
1445                 return;
1446
1447         mutex_lock(&local->iflist_mtx);
1448
1449         switch (type) {
1450         case NL80211_IFTYPE_MONITOR:
1451                 /* doesn't matter */
1452                 break;
1453         case NL80211_IFTYPE_WDS:
1454         case NL80211_IFTYPE_AP_VLAN:
1455                 /* match up with an AP interface */
1456                 list_for_each_entry(sdata, &local->interfaces, list) {
1457                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1458                                 continue;
1459                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1460                         break;
1461                 }
1462                 /* keep default if no AP interface present */
1463                 break;
1464         case NL80211_IFTYPE_P2P_CLIENT:
1465         case NL80211_IFTYPE_P2P_GO:
1466                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1467                         list_for_each_entry(sdata, &local->interfaces, list) {
1468                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1469                                         continue;
1470                                 if (!ieee80211_sdata_running(sdata))
1471                                         continue;
1472                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1473                                 goto out_unlock;
1474                         }
1475                 }
1476                 /* otherwise fall through */
1477         default:
1478                 /* assign a new address if possible -- try n_addresses first */
1479                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1480                         bool used = false;
1481
1482                         list_for_each_entry(sdata, &local->interfaces, list) {
1483                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1484                                            sdata->vif.addr, ETH_ALEN) == 0) {
1485                                         used = true;
1486                                         break;
1487                                 }
1488                         }
1489
1490                         if (!used) {
1491                                 memcpy(perm_addr,
1492                                        local->hw.wiphy->addresses[i].addr,
1493                                        ETH_ALEN);
1494                                 break;
1495                         }
1496                 }
1497
1498                 /* try mask if available */
1499                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1500                         break;
1501
1502                 m = local->hw.wiphy->addr_mask;
1503                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1504                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1505                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1506
1507                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1508                         /* not a contiguous mask ... not handled now! */
1509                         pr_info("not contiguous\n");
1510                         break;
1511                 }
1512
1513                 /*
1514                  * Pick address of existing interface in case user changed
1515                  * MAC address manually, default to perm_addr.
1516                  */
1517                 m = local->hw.wiphy->perm_addr;
1518                 list_for_each_entry(sdata, &local->interfaces, list) {
1519                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1520                                 continue;
1521                         m = sdata->vif.addr;
1522                         break;
1523                 }
1524                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1525                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1526                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1527
1528                 inc = 1ULL<<__ffs64(mask);
1529                 val = (start & mask);
1530                 addr = (start & ~mask) | (val & mask);
1531                 do {
1532                         bool used = false;
1533
1534                         tmp_addr[5] = addr >> 0*8;
1535                         tmp_addr[4] = addr >> 1*8;
1536                         tmp_addr[3] = addr >> 2*8;
1537                         tmp_addr[2] = addr >> 3*8;
1538                         tmp_addr[1] = addr >> 4*8;
1539                         tmp_addr[0] = addr >> 5*8;
1540
1541                         val += inc;
1542
1543                         list_for_each_entry(sdata, &local->interfaces, list) {
1544                                 if (memcmp(tmp_addr, sdata->vif.addr,
1545                                                         ETH_ALEN) == 0) {
1546                                         used = true;
1547                                         break;
1548                                 }
1549                         }
1550
1551                         if (!used) {
1552                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1553                                 break;
1554                         }
1555                         addr = (start & ~mask) | (val & mask);
1556                 } while (addr != start);
1557
1558                 break;
1559         }
1560
1561  out_unlock:
1562         mutex_unlock(&local->iflist_mtx);
1563 }
1564
1565 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1566                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1567                      struct vif_params *params)
1568 {
1569         struct net_device *ndev = NULL;
1570         struct ieee80211_sub_if_data *sdata = NULL;
1571         int ret, i;
1572         int txqs = 1;
1573
1574         ASSERT_RTNL();
1575
1576         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1577                 struct wireless_dev *wdev;
1578
1579                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1580                                 GFP_KERNEL);
1581                 if (!sdata)
1582                         return -ENOMEM;
1583                 wdev = &sdata->wdev;
1584
1585                 sdata->dev = NULL;
1586                 strlcpy(sdata->name, name, IFNAMSIZ);
1587                 ieee80211_assign_perm_addr(local, wdev->address, type);
1588                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1589         } else {
1590                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1591                         txqs = IEEE80211_NUM_ACS;
1592
1593                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1594                                         local->hw.vif_data_size,
1595                                         name, ieee80211_if_setup, txqs, 1);
1596                 if (!ndev)
1597                         return -ENOMEM;
1598                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1599
1600                 ndev->needed_headroom = local->tx_headroom +
1601                                         4*6 /* four MAC addresses */
1602                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1603                                         + 6 /* mesh */
1604                                         + 8 /* rfc1042/bridge tunnel */
1605                                         - ETH_HLEN /* ethernet hard_header_len */
1606                                         + IEEE80211_ENCRYPT_HEADROOM;
1607                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1608
1609                 ret = dev_alloc_name(ndev, ndev->name);
1610                 if (ret < 0) {
1611                         free_netdev(ndev);
1612                         return ret;
1613                 }
1614
1615                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1616                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1617                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1618
1619                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1620                 sdata = netdev_priv(ndev);
1621                 ndev->ieee80211_ptr = &sdata->wdev;
1622                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1623                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1624
1625                 sdata->dev = ndev;
1626         }
1627
1628         /* initialise type-independent data */
1629         sdata->wdev.wiphy = local->hw.wiphy;
1630         sdata->local = local;
1631
1632         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1633                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1634
1635         INIT_LIST_HEAD(&sdata->key_list);
1636
1637         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1638                           ieee80211_dfs_cac_timer_work);
1639         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1640                           ieee80211_delayed_tailroom_dec);
1641
1642         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1643                 struct ieee80211_supported_band *sband;
1644                 sband = local->hw.wiphy->bands[i];
1645                 sdata->rc_rateidx_mask[i] =
1646                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1647                 if (sband)
1648                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1649                                sband->ht_cap.mcs.rx_mask,
1650                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1651                 else
1652                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1653                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1654         }
1655
1656         ieee80211_set_default_queues(sdata);
1657
1658         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1659         sdata->user_power_level = local->user_power_level;
1660
1661         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1662
1663         /* setup type-dependent data */
1664         ieee80211_setup_sdata(sdata, type);
1665
1666         if (ndev) {
1667                 if (params) {
1668                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1669                         if (type == NL80211_IFTYPE_STATION)
1670                                 sdata->u.mgd.use_4addr = params->use_4addr;
1671                 }
1672
1673                 ndev->features |= local->hw.netdev_features;
1674
1675                 ret = register_netdevice(ndev);
1676                 if (ret) {
1677                         free_netdev(ndev);
1678                         return ret;
1679                 }
1680         }
1681
1682         mutex_lock(&local->iflist_mtx);
1683         list_add_tail_rcu(&sdata->list, &local->interfaces);
1684         mutex_unlock(&local->iflist_mtx);
1685
1686         if (new_wdev)
1687                 *new_wdev = &sdata->wdev;
1688
1689         return 0;
1690 }
1691
1692 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1693 {
1694         ASSERT_RTNL();
1695
1696         mutex_lock(&sdata->local->iflist_mtx);
1697         list_del_rcu(&sdata->list);
1698         mutex_unlock(&sdata->local->iflist_mtx);
1699
1700         synchronize_rcu();
1701
1702         if (sdata->dev) {
1703                 unregister_netdevice(sdata->dev);
1704         } else {
1705                 cfg80211_unregister_wdev(&sdata->wdev);
1706                 kfree(sdata);
1707         }
1708 }
1709
1710 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1711 {
1712         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1713                 return;
1714         ieee80211_do_stop(sdata, true);
1715         ieee80211_teardown_sdata(sdata);
1716 }
1717
1718 /*
1719  * Remove all interfaces, may only be called at hardware unregistration
1720  * time because it doesn't do RCU-safe list removals.
1721  */
1722 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1723 {
1724         struct ieee80211_sub_if_data *sdata, *tmp;
1725         LIST_HEAD(unreg_list);
1726         LIST_HEAD(wdev_list);
1727
1728         ASSERT_RTNL();
1729
1730         /*
1731          * Close all AP_VLAN interfaces first, as otherwise they
1732          * might be closed while the AP interface they belong to
1733          * is closed, causing unregister_netdevice_many() to crash.
1734          */
1735         list_for_each_entry(sdata, &local->interfaces, list)
1736                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1737                         dev_close(sdata->dev);
1738
1739         mutex_lock(&local->iflist_mtx);
1740         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1741                 list_del(&sdata->list);
1742
1743                 if (sdata->dev)
1744                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1745                 else
1746                         list_add(&sdata->list, &wdev_list);
1747         }
1748         mutex_unlock(&local->iflist_mtx);
1749         unregister_netdevice_many(&unreg_list);
1750         list_del(&unreg_list);
1751
1752         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1753                 list_del(&sdata->list);
1754                 cfg80211_unregister_wdev(&sdata->wdev);
1755                 kfree(sdata);
1756         }
1757 }
1758
1759 static int netdev_notify(struct notifier_block *nb,
1760                          unsigned long state, void *ptr)
1761 {
1762         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
1763         struct ieee80211_sub_if_data *sdata;
1764
1765         if (state != NETDEV_CHANGENAME)
1766                 return 0;
1767
1768         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1769                 return 0;
1770
1771         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1772                 return 0;
1773
1774         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1775
1776         memcpy(sdata->name, dev->name, IFNAMSIZ);
1777
1778         ieee80211_debugfs_rename_netdev(sdata);
1779         return 0;
1780 }
1781
1782 static struct notifier_block mac80211_netdev_notifier = {
1783         .notifier_call = netdev_notify,
1784 };
1785
1786 int ieee80211_iface_init(void)
1787 {
1788         return register_netdevice_notifier(&mac80211_netdev_notifier);
1789 }
1790
1791 void ieee80211_iface_exit(void)
1792 {
1793         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1794 }