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                               const char *reason)
  83 {
  84         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  85                 return 0;
  86
  87         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  88         return IEEE80211_CONF_CHANGE_IDLE;
  89 }
  90
  91 static u32 ieee80211_idle_on(struct ieee80211_local *local)
  92 {
  93         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  94                 return 0;
  95
  96         drv_flush(local, false);
  97
  98         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
  99         return IEEE80211_CONF_CHANGE_IDLE;
 100 }
 101
 102 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
 103 {
 104         struct ieee80211_sub_if_data *sdata;
 105         int count = 0;
 106         bool working = false, scanning = false;
 107         unsigned int led_trig_start = 0, led_trig_stop = 0;
 108         struct ieee80211_roc_work *roc;
 109
 110 #ifdef CONFIG_PROVE_LOCKING
 111         WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
 112                 !lockdep_is_held(&local->iflist_mtx));
 113 #endif
 114         lockdep_assert_held(&local->mtx);
 115
 116         list_for_each_entry(sdata, &local->interfaces, list) {
 117                 if (!ieee80211_sdata_running(sdata)) {
 118                         sdata->vif.bss_conf.idle = true;
 119                         continue;
 120                 }
 121
 122                 sdata->old_idle = sdata->vif.bss_conf.idle;
 123
 124                 /* do not count disabled managed interfaces */
 125                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
 126                     !sdata->u.mgd.associated &&
 127                     !sdata->u.mgd.auth_data &&
 128                     !sdata->u.mgd.assoc_data) {
 129                         sdata->vif.bss_conf.idle = true;
 130                         continue;
 131                 }
 132                 /* do not count unused IBSS interfaces */
 133                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
 134                     !sdata->u.ibss.ssid_len) {
 135                         sdata->vif.bss_conf.idle = true;
 136                         continue;
 137                 }
 138
 139                 if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
 140                         continue;
 141
 142                 /* count everything else */
 143                 sdata->vif.bss_conf.idle = false;
 144                 count++;
 145         }
 146
 147         if (!local->ops->remain_on_channel) {
 148                 list_for_each_entry(roc, &local->roc_list, list) {
 149                         working = true;
 150                         roc->sdata->vif.bss_conf.idle = false;
 151                 }
 152         }
 153
 154         sdata = rcu_dereference_protected(local->scan_sdata,
 155                                           lockdep_is_held(&local->mtx));
 156         if (sdata && !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
 157                 scanning = true;
 158                 sdata->vif.bss_conf.idle = false;
 159         }
 160
 161         list_for_each_entry(sdata, &local->interfaces, list) {
 162                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 163                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
 164                     sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE)
 165                         continue;
 166                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
 167                         continue;
 168                 if (!ieee80211_sdata_running(sdata))
 169                         continue;
 170                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
 171         }
 172
 173         if (working || scanning)
 174                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 175         else
 176                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 177
 178         if (count)
 179                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 180         else
 181                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 182
 183         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 184
 185         if (working)
 186                 return ieee80211_idle_off(local, "working");
 187         if (scanning)
 188                 return ieee80211_idle_off(local, "scanning");
 189         if (!count)
 190                 return ieee80211_idle_on(local);
 191         else
 192                 return ieee80211_idle_off(local, "in use");
 193
 194         return 0;
 195 }
 196
 197 void ieee80211_recalc_idle(struct ieee80211_local *local)
 198 {
 199         u32 chg;
 200
 201         mutex_lock(&local->iflist_mtx);
 202         chg = __ieee80211_recalc_idle(local);
 203         mutex_unlock(&local->iflist_mtx);
 204         if (chg)
 205                 ieee80211_hw_config(local, chg);
 206 }
 207
 208 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 209 {
 210         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
 211                 return -EINVAL;
 212
 213         dev->mtu = new_mtu;
 214         return 0;
 215 }
 216
 217 static int ieee80211_verify_mac(struct ieee80211_local *local, u8 *addr)
 218 {
 219         struct ieee80211_sub_if_data *sdata;
 220         u64 new, mask, tmp;
 221         u8 *m;
 222         int ret = 0;
 223
 224         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 225                 return 0;
 226
 227         m = addr;
 228         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 229                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 230                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 231
 232         m = local->hw.wiphy->addr_mask;
 233         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 234                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 235                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 236
 237
 238         mutex_lock(&local->iflist_mtx);
 239         list_for_each_entry(sdata, &local->interfaces, list) {
 240                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
 241                         continue;
 242
 243                 m = sdata->vif.addr;
 244                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 245                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 246                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 247
 248                 if ((new & ~mask) != (tmp & ~mask)) {
 249                         ret = -EINVAL;
 250                         break;
 251                 }
 252         }
 253         mutex_unlock(&local->iflist_mtx);
 254
 255         return ret;
 256 }
 257
 258 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 259 {
 260         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 261         struct sockaddr *sa = addr;
 262         int ret;
 263
 264         if (ieee80211_sdata_running(sdata))
 265                 return -EBUSY;
 266
 267         ret = ieee80211_verify_mac(sdata->local, sa->sa_data);
 268         if (ret)
 269                 return ret;
 270
 271         ret = eth_mac_addr(dev, sa);
 272
 273         if (ret == 0)
 274                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 275
 276         return ret;
 277 }
 278
 279 static inline int identical_mac_addr_allowed(int type1, int type2)
 280 {
 281         return type1 == NL80211_IFTYPE_MONITOR ||
 282                 type2 == NL80211_IFTYPE_MONITOR ||
 283                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 284                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 285                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 286                 (type1 == NL80211_IFTYPE_WDS &&
 287                         (type2 == NL80211_IFTYPE_WDS ||
 288                          type2 == NL80211_IFTYPE_AP)) ||
 289                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 290                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 291                         (type2 == NL80211_IFTYPE_AP ||
 292                          type2 == NL80211_IFTYPE_AP_VLAN));
 293 }
 294
 295 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 296                                             enum nl80211_iftype iftype)
 297 {
 298         struct ieee80211_local *local = sdata->local;
 299         struct ieee80211_sub_if_data *nsdata;
 300
 301         ASSERT_RTNL();
 302
 303         /* we hold the RTNL here so can safely walk the list */
 304         list_for_each_entry(nsdata, &local->interfaces, list) {
 305                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 306                         /*
 307                          * Allow only a single IBSS interface to be up at any
 308                          * time. This is restricted because beacon distribution
 309                          * cannot work properly if both are in the same IBSS.
 310                          *
 311                          * To remove this restriction we'd have to disallow them
 312                          * from setting the same SSID on different IBSS interfaces
 313                          * belonging to the same hardware. Then, however, we're
 314                          * faced with having to adopt two different TSF timers...
 315                          */
 316                         if (iftype == NL80211_IFTYPE_ADHOC &&
 317                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 318                                 return -EBUSY;
 319
 320                         /*
 321                          * The remaining checks are only performed for interfaces
 322                          * with the same MAC address.
 323                          */
 324                         if (!ether_addr_equal(sdata->vif.addr,
 325                                               nsdata->vif.addr))
 326                                 continue;
 327
 328                         /*
 329                          * check whether it may have the same address
 330                          */
 331                         if (!identical_mac_addr_allowed(iftype,
 332                                                         nsdata->vif.type))
 333                                 return -ENOTUNIQ;
 334
 335                         /*
 336                          * can only add VLANs to enabled APs
 337                          */
 338                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 339                             nsdata->vif.type == NL80211_IFTYPE_AP)
 340                                 sdata->bss = &nsdata->u.ap;
 341                 }
 342         }
 343
 344         return 0;
 345 }
 346
 347 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
 348 {
 349         int n_queues = sdata->local->hw.queues;
 350         int i;
 351
 352         if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
 353                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 354                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 355                                          IEEE80211_INVAL_HW_QUEUE))
 356                                 return -EINVAL;
 357                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 358                                          n_queues))
 359                                 return -EINVAL;
 360                 }
 361         }
 362
 363         if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
 364             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
 365                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 366                 return 0;
 367         }
 368
 369         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 370                 return -EINVAL;
 371
 372         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 373                 return -EINVAL;
 374
 375         return 0;
 376 }
 377
 378 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 379                                     const int offset)
 380 {
 381         struct ieee80211_local *local = sdata->local;
 382         u32 flags = sdata->u.mntr_flags;
 383
 384 #define ADJUST(_f, _s)  do {                                    \
 385         if (flags & MONITOR_FLAG_##_f)                          \
 386                 local->fif_##_s += offset;                      \
 387         } while (0)
 388
 389         ADJUST(FCSFAIL, fcsfail);
 390         ADJUST(PLCPFAIL, plcpfail);
 391         ADJUST(CONTROL, control);
 392         ADJUST(CONTROL, pspoll);
 393         ADJUST(OTHER_BSS, other_bss);
 394
 395 #undef ADJUST
 396 }
 397
 398 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 399 {
 400         struct ieee80211_local *local = sdata->local;
 401         int i;
 402
 403         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 404                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
 405                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 406                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 407                         sdata->vif.hw_queue[i] = i;
 408                 else
 409                         sdata->vif.hw_queue[i] = 0;
 410         }
 411         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 412 }
 413
 414 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 415 {
 416         struct ieee80211_sub_if_data *sdata;
 417         int ret = 0;
 418
 419         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 420                 return 0;
 421
 422         mutex_lock(&local->iflist_mtx);
 423
 424         if (local->monitor_sdata)
 425                 goto out_unlock;
 426
 427         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 428         if (!sdata) {
 429                 ret = -ENOMEM;
 430                 goto out_unlock;
 431         }
 432
 433         /* set up data */
 434         sdata->local = local;
 435         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 436         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 437                  wiphy_name(local->hw.wiphy));
 438
 439         ieee80211_set_default_queues(sdata);
 440
 441         ret = drv_add_interface(local, sdata);
 442         if (WARN_ON(ret)) {
 443                 /* ok .. stupid driver, it asked for this! */
 444                 kfree(sdata);
 445                 goto out_unlock;
 446         }
 447
 448         ret = ieee80211_check_queues(sdata);
 449         if (ret) {
 450                 kfree(sdata);
 451                 goto out_unlock;
 452         }
 453
 454         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 455                                         IEEE80211_CHANCTX_EXCLUSIVE);
 456         if (ret) {
 457                 drv_remove_interface(local, sdata);
 458                 kfree(sdata);
 459                 goto out_unlock;
 460         }
 461
 462         rcu_assign_pointer(local->monitor_sdata, sdata);
 463  out_unlock:
 464         mutex_unlock(&local->iflist_mtx);
 465         return ret;
 466 }
 467
 468 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 469 {
 470         struct ieee80211_sub_if_data *sdata;
 471
 472         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 473                 return;
 474
 475         mutex_lock(&local->iflist_mtx);
 476
 477         sdata = rcu_dereference_protected(local->monitor_sdata,
 478                                           lockdep_is_held(&local->iflist_mtx));
 479         if (!sdata)
 480                 goto out_unlock;
 481
 482         rcu_assign_pointer(local->monitor_sdata, NULL);
 483         synchronize_net();
 484
 485         ieee80211_vif_release_channel(sdata);
 486
 487         drv_remove_interface(local, sdata);
 488
 489         kfree(sdata);
 490  out_unlock:
 491         mutex_unlock(&local->iflist_mtx);
 492 }
 493
 494 /*
 495  * NOTE: Be very careful when changing this function, it must NOT return
 496  * an error on interface type changes that have been pre-checked, so most
 497  * checks should be in ieee80211_check_concurrent_iface.
 498  */
 499 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 500 {
 501         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 502         struct net_device *dev = wdev->netdev;
 503         struct ieee80211_local *local = sdata->local;
 504         struct sta_info *sta;
 505         u32 changed = 0;
 506         int res;
 507         u32 hw_reconf_flags = 0;
 508
 509         switch (sdata->vif.type) {
 510         case NL80211_IFTYPE_WDS:
 511                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 512                         return -ENOLINK;
 513                 break;
 514         case NL80211_IFTYPE_AP_VLAN: {
 515                 struct ieee80211_sub_if_data *master;
 516
 517                 if (!sdata->bss)
 518                         return -ENOLINK;
 519
 520                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 521
 522                 master = container_of(sdata->bss,
 523                                       struct ieee80211_sub_if_data, u.ap);
 524                 sdata->control_port_protocol =
 525                         master->control_port_protocol;
 526                 sdata->control_port_no_encrypt =
 527                         master->control_port_no_encrypt;
 528                 break;
 529                 }
 530         case NL80211_IFTYPE_AP:
 531                 sdata->bss = &sdata->u.ap;
 532                 break;
 533         case NL80211_IFTYPE_MESH_POINT:
 534         case NL80211_IFTYPE_STATION:
 535         case NL80211_IFTYPE_MONITOR:
 536         case NL80211_IFTYPE_ADHOC:
 537         case NL80211_IFTYPE_P2P_DEVICE:
 538                 /* no special treatment */
 539                 break;
 540         case NL80211_IFTYPE_UNSPECIFIED:
 541         case NUM_NL80211_IFTYPES:
 542         case NL80211_IFTYPE_P2P_CLIENT:
 543         case NL80211_IFTYPE_P2P_GO:
 544                 /* cannot happen */
 545                 WARN_ON(1);
 546                 break;
 547         }
 548
 549         if (local->open_count == 0) {
 550                 res = drv_start(local);
 551                 if (res)
 552                         goto err_del_bss;
 553                 if (local->ops->napi_poll)
 554                         napi_enable(&local->napi);
 555                 /* we're brought up, everything changes */
 556                 hw_reconf_flags = ~0;
 557                 ieee80211_led_radio(local, true);
 558                 ieee80211_mod_tpt_led_trig(local,
 559                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 560         }
 561
 562         /*
 563          * Copy the hopefully now-present MAC address to
 564          * this interface, if it has the special null one.
 565          */
 566         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 567                 memcpy(dev->dev_addr,
 568                        local->hw.wiphy->perm_addr,
 569                        ETH_ALEN);
 570                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 571
 572                 if (!is_valid_ether_addr(dev->dev_addr)) {
 573                         res = -EADDRNOTAVAIL;
 574                         goto err_stop;
 575                 }
 576         }
 577
 578         switch (sdata->vif.type) {
 579         case NL80211_IFTYPE_AP_VLAN:
 580                 /* no need to tell driver, but set carrier and chanctx */
 581                 if (rtnl_dereference(sdata->bss->beacon)) {
 582                         ieee80211_vif_vlan_copy_chanctx(sdata);
 583                         netif_carrier_on(dev);
 584                 } else {
 585                         netif_carrier_off(dev);
 586                 }
 587                 break;
 588         case NL80211_IFTYPE_MONITOR:
 589                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 590                         local->cooked_mntrs++;
 591                         break;
 592                 }
 593
 594                 if (local->monitors == 0 && local->open_count == 0) {
 595                         res = ieee80211_add_virtual_monitor(local);
 596                         if (res)
 597                                 goto err_stop;
 598                 }
 599
 600                 /* must be before the call to ieee80211_configure_filter */
 601                 local->monitors++;
 602                 if (local->monitors == 1) {
 603                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 604                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 605                 }
 606
 607                 ieee80211_adjust_monitor_flags(sdata, 1);
 608                 ieee80211_configure_filter(local);
 609
 610                 netif_carrier_on(dev);
 611                 break;
 612         default:
 613                 if (coming_up) {
 614                         ieee80211_del_virtual_monitor(local);
 615
 616                         res = drv_add_interface(local, sdata);
 617                         if (res)
 618                                 goto err_stop;
 619                         res = ieee80211_check_queues(sdata);
 620                         if (res)
 621                                 goto err_del_interface;
 622                 }
 623
 624                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 625                         local->fif_pspoll++;
 626                         local->fif_probe_req++;
 627
 628                         ieee80211_configure_filter(local);
 629                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 630                         local->fif_probe_req++;
 631                 }
 632
 633                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 634                         changed |= ieee80211_reset_erp_info(sdata);
 635                 ieee80211_bss_info_change_notify(sdata, changed);
 636
 637                 switch (sdata->vif.type) {
 638                 case NL80211_IFTYPE_STATION:
 639                 case NL80211_IFTYPE_ADHOC:
 640                 case NL80211_IFTYPE_AP:
 641                 case NL80211_IFTYPE_MESH_POINT:
 642                         netif_carrier_off(dev);
 643                         break;
 644                 case NL80211_IFTYPE_WDS:
 645                 case NL80211_IFTYPE_P2P_DEVICE:
 646                         break;
 647                 default:
 648                         netif_carrier_on(dev);
 649                 }
 650
 651                 /*
 652                  * set default queue parameters so drivers don't
 653                  * need to initialise the hardware if the hardware
 654                  * doesn't start up with sane defaults
 655                  */
 656                 ieee80211_set_wmm_default(sdata, true);
 657         }
 658
 659         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 660
 661         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 662                 /* Create STA entry for the WDS peer */
 663                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 664                                      GFP_KERNEL);
 665                 if (!sta) {
 666                         res = -ENOMEM;
 667                         goto err_del_interface;
 668                 }
 669
 670                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 671                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 672                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 673
 674                 res = sta_info_insert(sta);
 675                 if (res) {
 676                         /* STA has been freed */
 677                         goto err_del_interface;
 678                 }
 679
 680                 rate_control_rate_init(sta);
 681                 netif_carrier_on(dev);
 682         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 683                 rcu_assign_pointer(local->p2p_sdata, sdata);
 684         }
 685
 686         /*
 687          * set_multicast_list will be invoked by the networking core
 688          * which will check whether any increments here were done in
 689          * error and sync them down to the hardware as filter flags.
 690          */
 691         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 692                 atomic_inc(&local->iff_allmultis);
 693
 694         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 695                 atomic_inc(&local->iff_promiscs);
 696
 697         mutex_lock(&local->mtx);
 698         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 699         mutex_unlock(&local->mtx);
 700
 701         if (coming_up)
 702                 local->open_count++;
 703
 704         if (hw_reconf_flags)
 705                 ieee80211_hw_config(local, hw_reconf_flags);
 706
 707         ieee80211_recalc_ps(local, -1);
 708
 709         if (dev)
 710                 netif_tx_start_all_queues(dev);
 711
 712         return 0;
 713  err_del_interface:
 714         drv_remove_interface(local, sdata);
 715  err_stop:
 716         if (!local->open_count)
 717                 drv_stop(local);
 718  err_del_bss:
 719         sdata->bss = NULL;
 720         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 721                 list_del(&sdata->u.vlan.list);
 722         /* might already be clear but that doesn't matter */
 723         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 724         return res;
 725 }
 726
 727 static int ieee80211_open(struct net_device *dev)
 728 {
 729         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 730         int err;
 731
 732         /* fail early if user set an invalid address */
 733         if (!is_valid_ether_addr(dev->dev_addr))
 734                 return -EADDRNOTAVAIL;
 735
 736         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 737         if (err)
 738                 return err;
 739
 740         return ieee80211_do_open(&sdata->wdev, true);
 741 }
 742
 743 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 744                               bool going_down)
 745 {
 746         struct ieee80211_local *local = sdata->local;
 747         unsigned long flags;
 748         struct sk_buff *skb, *tmp;
 749         u32 hw_reconf_flags = 0;
 750         int i, flushed;
 751
 752         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 753
 754         if (rcu_access_pointer(local->scan_sdata) == sdata)
 755                 ieee80211_scan_cancel(local);
 756
 757         /*
 758          * Stop TX on this interface first.
 759          */
 760         if (sdata->dev)
 761                 netif_tx_stop_all_queues(sdata->dev);
 762
 763         ieee80211_roc_purge(sdata);
 764
 765         /*
 766          * Remove all stations associated with this interface.
 767          *
 768          * This must be done before calling ops->remove_interface()
 769          * because otherwise we can later invoke ops->sta_notify()
 770          * whenever the STAs are removed, and that invalidates driver
 771          * assumptions about always getting a vif pointer that is valid
 772          * (because if we remove a STA after ops->remove_interface()
 773          * the driver will have removed the vif info already!)
 774          *
 775          * This is relevant only in WDS mode, in all other modes we've
 776          * already removed all stations when disconnecting or similar,
 777          * so warn otherwise.
 778          *
 779          * We call sta_info_flush_cleanup() later, to combine RCU waits.
 780          */
 781         flushed = sta_info_flush_defer(sdata);
 782         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 783                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
 784
 785         /*
 786          * Don't count this interface for promisc/allmulti while it
 787          * is down. dev_mc_unsync() will invoke set_multicast_list
 788          * on the master interface which will sync these down to the
 789          * hardware as filter flags.
 790          */
 791         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 792                 atomic_dec(&local->iff_allmultis);
 793
 794         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 795                 atomic_dec(&local->iff_promiscs);
 796
 797         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 798                 local->fif_pspoll--;
 799                 local->fif_probe_req--;
 800         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 801                 local->fif_probe_req--;
 802         }
 803
 804         if (sdata->dev) {
 805                 netif_addr_lock_bh(sdata->dev);
 806                 spin_lock_bh(&local->filter_lock);
 807                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 808                                  sdata->dev->addr_len);
 809                 spin_unlock_bh(&local->filter_lock);
 810                 netif_addr_unlock_bh(sdata->dev);
 811
 812                 ieee80211_configure_filter(local);
 813         }
 814
 815         del_timer_sync(&local->dynamic_ps_timer);
 816         cancel_work_sync(&local->dynamic_ps_enable_work);
 817
 818         cancel_work_sync(&sdata->recalc_smps);
 819
 820         /* APs need special treatment */
 821         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 822                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 823
 824                 /* down all dependent devices, that is VLANs */
 825                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 826                                          u.vlan.list)
 827                         dev_close(vlan->dev);
 828                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 829         } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 830                 ieee80211_mgd_stop(sdata);
 831         }
 832
 833         if (going_down)
 834                 local->open_count--;
 835
 836         switch (sdata->vif.type) {
 837         case NL80211_IFTYPE_AP_VLAN:
 838                 list_del(&sdata->u.vlan.list);
 839                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
 840                 /* no need to tell driver */
 841                 break;
 842         case NL80211_IFTYPE_MONITOR:
 843                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 844                         local->cooked_mntrs--;
 845                         break;
 846                 }
 847
 848                 local->monitors--;
 849                 if (local->monitors == 0) {
 850                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 851                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 852                         ieee80211_del_virtual_monitor(local);
 853                 }
 854
 855                 ieee80211_adjust_monitor_flags(sdata, -1);
 856                 ieee80211_configure_filter(local);
 857                 break;
 858         case NL80211_IFTYPE_P2P_DEVICE:
 859                 /* relies on synchronize_rcu() below */
 860                 rcu_assign_pointer(local->p2p_sdata, NULL);
 861                 /* fall through */
 862         default:
 863                 cancel_work_sync(&sdata->work);
 864                 /*
 865                  * When we get here, the interface is marked down.
 866                  *
 867                  * sta_info_flush_cleanup() requires rcu_barrier()
 868                  * first to wait for the station call_rcu() calls
 869                  * to complete, here we need at least sychronize_rcu()
 870                  * it to wait for the RX path in case it is using the
 871                  * interface and enqueuing frames at this very time on
 872                  * another CPU.
 873                  */
 874                 rcu_barrier();
 875                 sta_info_flush_cleanup(sdata);
 876
 877                 skb_queue_purge(&sdata->skb_queue);
 878
 879                 /*
 880                  * Free all remaining keys, there shouldn't be any,
 881                  * except maybe group keys in AP more or WDS?
 882                  */
 883                 ieee80211_free_keys(sdata);
 884
 885                 if (going_down)
 886                         drv_remove_interface(local, sdata);
 887         }
 888
 889         sdata->bss = NULL;
 890
 891         mutex_lock(&local->mtx);
 892         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 893         mutex_unlock(&local->mtx);
 894
 895         ieee80211_recalc_ps(local, -1);
 896
 897         if (local->open_count == 0) {
 898                 if (local->ops->napi_poll)
 899                         napi_disable(&local->napi);
 900                 ieee80211_clear_tx_pending(local);
 901                 ieee80211_stop_device(local);
 902
 903                 /* no reconfiguring after stop! */
 904                 hw_reconf_flags = 0;
 905         }
 906
 907         /* do after stop to avoid reconfiguring when we stop anyway */
 908         if (hw_reconf_flags)
 909                 ieee80211_hw_config(local, hw_reconf_flags);
 910
 911         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 912         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 913                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 914                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 915                         if (info->control.vif == &sdata->vif) {
 916                                 __skb_unlink(skb, &local->pending[i]);
 917                                 ieee80211_free_txskb(&local->hw, skb);
 918                         }
 919                 }
 920         }
 921         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 922
 923         if (local->monitors == local->open_count && local->monitors > 0)
 924                 ieee80211_add_virtual_monitor(local);
 925 }
 926
 927 static int ieee80211_stop(struct net_device *dev)
 928 {
 929         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 930
 931         ieee80211_do_stop(sdata, true);
 932
 933         return 0;
 934 }
 935
 936 static void ieee80211_set_multicast_list(struct net_device *dev)
 937 {
 938         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 939         struct ieee80211_local *local = sdata->local;
 940         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 941
 942         allmulti = !!(dev->flags & IFF_ALLMULTI);
 943         promisc = !!(dev->flags & IFF_PROMISC);
 944         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 945         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 946
 947         if (allmulti != sdata_allmulti) {
 948                 if (dev->flags & IFF_ALLMULTI)
 949                         atomic_inc(&local->iff_allmultis);
 950                 else
 951                         atomic_dec(&local->iff_allmultis);
 952                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 953         }
 954
 955         if (promisc != sdata_promisc) {
 956                 if (dev->flags & IFF_PROMISC)
 957                         atomic_inc(&local->iff_promiscs);
 958                 else
 959                         atomic_dec(&local->iff_promiscs);
 960                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 961         }
 962         spin_lock_bh(&local->filter_lock);
 963         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 964         spin_unlock_bh(&local->filter_lock);
 965         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 966 }
 967
 968 /*
 969  * Called when the netdev is removed or, by the code below, before
 970  * the interface type changes.
 971  */
 972 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 973 {
 974         int flushed;
 975         int i;
 976
 977         /* free extra data */
 978         ieee80211_free_keys(sdata);
 979
 980         ieee80211_debugfs_remove_netdev(sdata);
 981
 982         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 983                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 984         sdata->fragment_next = 0;
 985
 986         if (ieee80211_vif_is_mesh(&sdata->vif))
 987                 mesh_rmc_free(sdata);
 988
 989         flushed = sta_info_flush(sdata);
 990         WARN_ON(flushed);
 991 }
 992
 993 static void ieee80211_uninit(struct net_device *dev)
 994 {
 995         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
 996 }
 997
 998 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 999                                          struct sk_buff *skb)
1000 {
1001         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1002 }
1003
1004 static const struct net_device_ops ieee80211_dataif_ops = {
1005         .ndo_open               = ieee80211_open,
1006         .ndo_stop               = ieee80211_stop,
1007         .ndo_uninit             = ieee80211_uninit,
1008         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1009         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1010         .ndo_change_mtu         = ieee80211_change_mtu,
1011         .ndo_set_mac_address    = ieee80211_change_mac,
1012         .ndo_select_queue       = ieee80211_netdev_select_queue,
1013 };
1014
1015 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1016                                           struct sk_buff *skb)
1017 {
1018         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1019         struct ieee80211_local *local = sdata->local;
1020         struct ieee80211_hdr *hdr;
1021         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1022
1023         if (local->hw.queues < IEEE80211_NUM_ACS)
1024                 return 0;
1025
1026         if (skb->len < 4 ||
1027             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1028                 return 0; /* doesn't matter, frame will be dropped */
1029
1030         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1031
1032         return ieee80211_select_queue_80211(sdata, skb, hdr);
1033 }
1034
1035 static const struct net_device_ops ieee80211_monitorif_ops = {
1036         .ndo_open               = ieee80211_open,
1037         .ndo_stop               = ieee80211_stop,
1038         .ndo_uninit             = ieee80211_uninit,
1039         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1040         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1041         .ndo_change_mtu         = ieee80211_change_mtu,
1042         .ndo_set_mac_address    = eth_mac_addr,
1043         .ndo_select_queue       = ieee80211_monitor_select_queue,
1044 };
1045
1046 static void ieee80211_if_setup(struct net_device *dev)
1047 {
1048         ether_setup(dev);
1049         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1050         dev->netdev_ops = &ieee80211_dataif_ops;
1051         dev->destructor = free_netdev;
1052 }
1053
1054 static void ieee80211_iface_work(struct work_struct *work)
1055 {
1056         struct ieee80211_sub_if_data *sdata =
1057                 container_of(work, struct ieee80211_sub_if_data, work);
1058         struct ieee80211_local *local = sdata->local;
1059         struct sk_buff *skb;
1060         struct sta_info *sta;
1061         struct ieee80211_ra_tid *ra_tid;
1062
1063         if (!ieee80211_sdata_running(sdata))
1064                 return;
1065
1066         if (local->scanning)
1067                 return;
1068
1069         /*
1070          * ieee80211_queue_work() should have picked up most cases,
1071          * here we'll pick the rest.
1072          */
1073         if (WARN(local->suspended,
1074                  "interface work scheduled while going to suspend\n"))
1075                 return;
1076
1077         /* first process frames */
1078         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1079                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1080
1081                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1082                         ra_tid = (void *)&skb->cb;
1083                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1084                                                  ra_tid->tid);
1085                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1086                         ra_tid = (void *)&skb->cb;
1087                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1088                                                 ra_tid->tid);
1089                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1090                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1091                         int len = skb->len;
1092
1093                         mutex_lock(&local->sta_mtx);
1094                         sta = sta_info_get_bss(sdata, mgmt->sa);
1095                         if (sta) {
1096                                 switch (mgmt->u.action.u.addba_req.action_code) {
1097                                 case WLAN_ACTION_ADDBA_REQ:
1098                                         ieee80211_process_addba_request(
1099                                                         local, sta, mgmt, len);
1100                                         break;
1101                                 case WLAN_ACTION_ADDBA_RESP:
1102                                         ieee80211_process_addba_resp(local, sta,
1103                                                                      mgmt, len);
1104                                         break;
1105                                 case WLAN_ACTION_DELBA:
1106                                         ieee80211_process_delba(sdata, sta,
1107                                                                 mgmt, len);
1108                                         break;
1109                                 default:
1110                                         WARN_ON(1);
1111                                         break;
1112                                 }
1113                         }
1114                         mutex_unlock(&local->sta_mtx);
1115                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1116                         struct ieee80211_hdr *hdr = (void *)mgmt;
1117                         /*
1118                          * So the frame isn't mgmt, but frame_control
1119                          * is at the right place anyway, of course, so
1120                          * the if statement is correct.
1121                          *
1122                          * Warn if we have other data frame types here,
1123                          * they must not get here.
1124                          */
1125                         WARN_ON(hdr->frame_control &
1126                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1127                         WARN_ON(!(hdr->seq_ctrl &
1128                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1129                         /*
1130                          * This was a fragment of a frame, received while
1131                          * a block-ack session was active. That cannot be
1132                          * right, so terminate the session.
1133                          */
1134                         mutex_lock(&local->sta_mtx);
1135                         sta = sta_info_get_bss(sdata, mgmt->sa);
1136                         if (sta) {
1137                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1138                                                 IEEE80211_QOS_CTL_TID_MASK;
1139
1140                                 __ieee80211_stop_rx_ba_session(
1141                                         sta, tid, WLAN_BACK_RECIPIENT,
1142                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1143                                         true);
1144                         }
1145                         mutex_unlock(&local->sta_mtx);
1146                 } else switch (sdata->vif.type) {
1147                 case NL80211_IFTYPE_STATION:
1148                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1149                         break;
1150                 case NL80211_IFTYPE_ADHOC:
1151                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1152                         break;
1153                 case NL80211_IFTYPE_MESH_POINT:
1154                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1155                                 break;
1156                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1157                         break;
1158                 default:
1159                         WARN(1, "frame for unexpected interface type");
1160                         break;
1161                 }
1162
1163                 kfree_skb(skb);
1164         }
1165
1166         /* then other type-dependent work */
1167         switch (sdata->vif.type) {
1168         case NL80211_IFTYPE_STATION:
1169                 ieee80211_sta_work(sdata);
1170                 break;
1171         case NL80211_IFTYPE_ADHOC:
1172                 ieee80211_ibss_work(sdata);
1173                 break;
1174         case NL80211_IFTYPE_MESH_POINT:
1175                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1176                         break;
1177                 ieee80211_mesh_work(sdata);
1178                 break;
1179         default:
1180                 break;
1181         }
1182 }
1183
1184 static void ieee80211_recalc_smps_work(struct work_struct *work)
1185 {
1186         struct ieee80211_sub_if_data *sdata =
1187                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1188
1189         ieee80211_recalc_smps(sdata);
1190 }
1191
1192 /*
1193  * Helper function to initialise an interface to a specific type.
1194  */
1195 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1196                                   enum nl80211_iftype type)
1197 {
1198         /* clear type-dependent union */
1199         memset(&sdata->u, 0, sizeof(sdata->u));
1200
1201         /* and set some type-dependent values */
1202         sdata->vif.type = type;
1203         sdata->vif.p2p = false;
1204         sdata->wdev.iftype = type;
1205
1206         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1207         sdata->control_port_no_encrypt = false;
1208
1209         sdata->noack_map = 0;
1210
1211         /* only monitor/p2p-device differ */
1212         if (sdata->dev) {
1213                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1214                 sdata->dev->type = ARPHRD_ETHER;
1215         }
1216
1217         skb_queue_head_init(&sdata->skb_queue);
1218         INIT_WORK(&sdata->work, ieee80211_iface_work);
1219         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1220
1221         switch (type) {
1222         case NL80211_IFTYPE_P2P_GO:
1223                 type = NL80211_IFTYPE_AP;
1224                 sdata->vif.type = type;
1225                 sdata->vif.p2p = true;
1226                 /* fall through */
1227         case NL80211_IFTYPE_AP:
1228                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1229                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1230                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1231                 break;
1232         case NL80211_IFTYPE_P2P_CLIENT:
1233                 type = NL80211_IFTYPE_STATION;
1234                 sdata->vif.type = type;
1235                 sdata->vif.p2p = true;
1236                 /* fall through */
1237         case NL80211_IFTYPE_STATION:
1238                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1239                 ieee80211_sta_setup_sdata(sdata);
1240                 break;
1241         case NL80211_IFTYPE_ADHOC:
1242                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1243                 ieee80211_ibss_setup_sdata(sdata);
1244                 break;
1245         case NL80211_IFTYPE_MESH_POINT:
1246                 if (ieee80211_vif_is_mesh(&sdata->vif))
1247                         ieee80211_mesh_init_sdata(sdata);
1248                 break;
1249         case NL80211_IFTYPE_MONITOR:
1250                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1251                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1252                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1253                                       MONITOR_FLAG_OTHER_BSS;
1254                 break;
1255         case NL80211_IFTYPE_WDS:
1256                 sdata->vif.bss_conf.bssid = NULL;
1257                 break;
1258         case NL80211_IFTYPE_AP_VLAN:
1259                 break;
1260         case NL80211_IFTYPE_P2P_DEVICE:
1261                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1262                 break;
1263         case NL80211_IFTYPE_UNSPECIFIED:
1264         case NUM_NL80211_IFTYPES:
1265                 BUG();
1266                 break;
1267         }
1268
1269         ieee80211_debugfs_add_netdev(sdata);
1270 }
1271
1272 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1273                                            enum nl80211_iftype type)
1274 {
1275         struct ieee80211_local *local = sdata->local;
1276         int ret, err;
1277         enum nl80211_iftype internal_type = type;
1278         bool p2p = false;
1279
1280         ASSERT_RTNL();
1281
1282         if (!local->ops->change_interface)
1283                 return -EBUSY;
1284
1285         switch (sdata->vif.type) {
1286         case NL80211_IFTYPE_AP:
1287         case NL80211_IFTYPE_STATION:
1288         case NL80211_IFTYPE_ADHOC:
1289                 /*
1290                  * Could maybe also all others here?
1291                  * Just not sure how that interacts
1292                  * with the RX/config path e.g. for
1293                  * mesh.
1294                  */
1295                 break;
1296         default:
1297                 return -EBUSY;
1298         }
1299
1300         switch (type) {
1301         case NL80211_IFTYPE_AP:
1302         case NL80211_IFTYPE_STATION:
1303         case NL80211_IFTYPE_ADHOC:
1304                 /*
1305                  * Could probably support everything
1306                  * but WDS here (WDS do_open can fail
1307                  * under memory pressure, which this
1308                  * code isn't prepared to handle).
1309                  */
1310                 break;
1311         case NL80211_IFTYPE_P2P_CLIENT:
1312                 p2p = true;
1313                 internal_type = NL80211_IFTYPE_STATION;
1314                 break;
1315         case NL80211_IFTYPE_P2P_GO:
1316                 p2p = true;
1317                 internal_type = NL80211_IFTYPE_AP;
1318                 break;
1319         default:
1320                 return -EBUSY;
1321         }
1322
1323         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1324         if (ret)
1325                 return ret;
1326
1327         ieee80211_do_stop(sdata, false);
1328
1329         ieee80211_teardown_sdata(sdata);
1330
1331         ret = drv_change_interface(local, sdata, internal_type, p2p);
1332         if (ret)
1333                 type = sdata->vif.type;
1334
1335         /*
1336          * Ignore return value here, there's not much we can do since
1337          * the driver changed the interface type internally already.
1338          * The warnings will hopefully make driver authors fix it :-)
1339          */
1340         ieee80211_check_queues(sdata);
1341
1342         ieee80211_setup_sdata(sdata, type);
1343
1344         err = ieee80211_do_open(&sdata->wdev, false);
1345         WARN(err, "type change: do_open returned %d", err);
1346
1347         return ret;
1348 }
1349
1350 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1351                              enum nl80211_iftype type)
1352 {
1353         int ret;
1354
1355         ASSERT_RTNL();
1356
1357         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1358                 return 0;
1359
1360         if (ieee80211_sdata_running(sdata)) {
1361                 ret = ieee80211_runtime_change_iftype(sdata, type);
1362                 if (ret)
1363                         return ret;
1364         } else {
1365                 /* Purge and reset type-dependent state. */
1366                 ieee80211_teardown_sdata(sdata);
1367                 ieee80211_setup_sdata(sdata, type);
1368         }
1369
1370         /* reset some values that shouldn't be kept across type changes */
1371         sdata->drop_unencrypted = 0;
1372         if (type == NL80211_IFTYPE_STATION)
1373                 sdata->u.mgd.use_4addr = false;
1374
1375         return 0;
1376 }
1377
1378 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1379                                        u8 *perm_addr, enum nl80211_iftype type)
1380 {
1381         struct ieee80211_sub_if_data *sdata;
1382         u64 mask, start, addr, val, inc;
1383         u8 *m;
1384         u8 tmp_addr[ETH_ALEN];
1385         int i;
1386
1387         /* default ... something at least */
1388         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1389
1390         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1391             local->hw.wiphy->n_addresses <= 1)
1392                 return;
1393
1394         mutex_lock(&local->iflist_mtx);
1395
1396         switch (type) {
1397         case NL80211_IFTYPE_MONITOR:
1398                 /* doesn't matter */
1399                 break;
1400         case NL80211_IFTYPE_WDS:
1401         case NL80211_IFTYPE_AP_VLAN:
1402                 /* match up with an AP interface */
1403                 list_for_each_entry(sdata, &local->interfaces, list) {
1404                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1405                                 continue;
1406                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1407                         break;
1408                 }
1409                 /* keep default if no AP interface present */
1410                 break;
1411         case NL80211_IFTYPE_P2P_CLIENT:
1412         case NL80211_IFTYPE_P2P_GO:
1413                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1414                         list_for_each_entry(sdata, &local->interfaces, list) {
1415                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1416                                         continue;
1417                                 if (!ieee80211_sdata_running(sdata))
1418                                         continue;
1419                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1420                                 goto out_unlock;
1421                         }
1422                 }
1423                 /* otherwise fall through */
1424         default:
1425                 /* assign a new address if possible -- try n_addresses first */
1426                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1427                         bool used = false;
1428
1429                         list_for_each_entry(sdata, &local->interfaces, list) {
1430                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1431                                            sdata->vif.addr, ETH_ALEN) == 0) {
1432                                         used = true;
1433                                         break;
1434                                 }
1435                         }
1436
1437                         if (!used) {
1438                                 memcpy(perm_addr,
1439                                        local->hw.wiphy->addresses[i].addr,
1440                                        ETH_ALEN);
1441                                 break;
1442                         }
1443                 }
1444
1445                 /* try mask if available */
1446                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1447                         break;
1448
1449                 m = local->hw.wiphy->addr_mask;
1450                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1451                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1452                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1453
1454                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1455                         /* not a contiguous mask ... not handled now! */
1456                         pr_info("not contiguous\n");
1457                         break;
1458                 }
1459
1460                 m = local->hw.wiphy->perm_addr;
1461                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1462                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1463                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1464
1465                 inc = 1ULL<<__ffs64(mask);
1466                 val = (start & mask);
1467                 addr = (start & ~mask) | (val & mask);
1468                 do {
1469                         bool used = false;
1470
1471                         tmp_addr[5] = addr >> 0*8;
1472                         tmp_addr[4] = addr >> 1*8;
1473                         tmp_addr[3] = addr >> 2*8;
1474                         tmp_addr[2] = addr >> 3*8;
1475                         tmp_addr[1] = addr >> 4*8;
1476                         tmp_addr[0] = addr >> 5*8;
1477
1478                         val += inc;
1479
1480                         list_for_each_entry(sdata, &local->interfaces, list) {
1481                                 if (memcmp(tmp_addr, sdata->vif.addr,
1482                                                         ETH_ALEN) == 0) {
1483                                         used = true;
1484                                         break;
1485                                 }
1486                         }
1487
1488                         if (!used) {
1489                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1490                                 break;
1491                         }
1492                         addr = (start & ~mask) | (val & mask);
1493                 } while (addr != start);
1494
1495                 break;
1496         }
1497
1498  out_unlock:
1499         mutex_unlock(&local->iflist_mtx);
1500 }
1501
1502 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1503 {
1504         struct ieee80211_sub_if_data *sdata;
1505
1506         sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1507
1508         ieee80211_cleanup_sdata_stas(sdata);
1509 }
1510
1511 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1512                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1513                      struct vif_params *params)
1514 {
1515         struct net_device *ndev = NULL;
1516         struct ieee80211_sub_if_data *sdata = NULL;
1517         int ret, i;
1518         int txqs = 1;
1519
1520         ASSERT_RTNL();
1521
1522         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1523                 struct wireless_dev *wdev;
1524
1525                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1526                                 GFP_KERNEL);
1527                 if (!sdata)
1528                         return -ENOMEM;
1529                 wdev = &sdata->wdev;
1530
1531                 sdata->dev = NULL;
1532                 strlcpy(sdata->name, name, IFNAMSIZ);
1533                 ieee80211_assign_perm_addr(local, wdev->address, type);
1534                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1535         } else {
1536                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1537                         txqs = IEEE80211_NUM_ACS;
1538
1539                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1540                                         local->hw.vif_data_size,
1541                                         name, ieee80211_if_setup, txqs, 1);
1542                 if (!ndev)
1543                         return -ENOMEM;
1544                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1545
1546                 ndev->needed_headroom = local->tx_headroom +
1547                                         4*6 /* four MAC addresses */
1548                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1549                                         + 6 /* mesh */
1550                                         + 8 /* rfc1042/bridge tunnel */
1551                                         - ETH_HLEN /* ethernet hard_header_len */
1552                                         + IEEE80211_ENCRYPT_HEADROOM;
1553                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1554
1555                 ret = dev_alloc_name(ndev, ndev->name);
1556                 if (ret < 0) {
1557                         free_netdev(ndev);
1558                         return ret;
1559                 }
1560
1561                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1562                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1563                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1564
1565                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1566                 sdata = netdev_priv(ndev);
1567                 ndev->ieee80211_ptr = &sdata->wdev;
1568                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1569                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1570
1571                 sdata->dev = ndev;
1572         }
1573
1574         /* initialise type-independent data */
1575         sdata->wdev.wiphy = local->hw.wiphy;
1576         sdata->local = local;
1577
1578         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1579                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1580
1581         INIT_LIST_HEAD(&sdata->key_list);
1582
1583         spin_lock_init(&sdata->cleanup_stations_lock);
1584         INIT_LIST_HEAD(&sdata->cleanup_stations);
1585         INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1586
1587         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1588                 struct ieee80211_supported_band *sband;
1589                 sband = local->hw.wiphy->bands[i];
1590                 sdata->rc_rateidx_mask[i] =
1591                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1592                 if (sband)
1593                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1594                                sband->ht_cap.mcs.rx_mask,
1595                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1596                 else
1597                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1598                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1599         }
1600
1601         ieee80211_set_default_queues(sdata);
1602
1603         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1604         sdata->user_power_level = local->user_power_level;
1605
1606         /* setup type-dependent data */
1607         ieee80211_setup_sdata(sdata, type);
1608
1609         if (ndev) {
1610                 if (params) {
1611                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1612                         if (type == NL80211_IFTYPE_STATION)
1613                                 sdata->u.mgd.use_4addr = params->use_4addr;
1614                 }
1615
1616                 ndev->features |= local->hw.netdev_features;
1617
1618                 ret = register_netdevice(ndev);
1619                 if (ret) {
1620                         free_netdev(ndev);
1621                         return ret;
1622                 }
1623         }
1624
1625         mutex_lock(&local->iflist_mtx);
1626         list_add_tail_rcu(&sdata->list, &local->interfaces);
1627         mutex_unlock(&local->iflist_mtx);
1628
1629         if (new_wdev)
1630                 *new_wdev = &sdata->wdev;
1631
1632         return 0;
1633 }
1634
1635 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1636 {
1637         ASSERT_RTNL();
1638
1639         mutex_lock(&sdata->local->iflist_mtx);
1640         list_del_rcu(&sdata->list);
1641         mutex_unlock(&sdata->local->iflist_mtx);
1642
1643         synchronize_rcu();
1644
1645         if (sdata->dev) {
1646                 unregister_netdevice(sdata->dev);
1647         } else {
1648                 cfg80211_unregister_wdev(&sdata->wdev);
1649                 kfree(sdata);
1650         }
1651 }
1652
1653 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1654 {
1655         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1656                 return;
1657         ieee80211_do_stop(sdata, true);
1658         ieee80211_teardown_sdata(sdata);
1659 }
1660
1661 /*
1662  * Remove all interfaces, may only be called at hardware unregistration
1663  * time because it doesn't do RCU-safe list removals.
1664  */
1665 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1666 {
1667         struct ieee80211_sub_if_data *sdata, *tmp;
1668         LIST_HEAD(unreg_list);
1669         LIST_HEAD(wdev_list);
1670
1671         ASSERT_RTNL();
1672
1673         mutex_lock(&local->iflist_mtx);
1674         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1675                 list_del(&sdata->list);
1676
1677                 if (sdata->dev)
1678                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1679                 else
1680                         list_add(&sdata->list, &wdev_list);
1681         }
1682         mutex_unlock(&local->iflist_mtx);
1683         unregister_netdevice_many(&unreg_list);
1684         list_del(&unreg_list);
1685
1686         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1687                 list_del(&sdata->list);
1688                 cfg80211_unregister_wdev(&sdata->wdev);
1689                 kfree(sdata);
1690         }
1691 }
1692
1693 static int netdev_notify(struct notifier_block *nb,
1694                          unsigned long state,
1695                          void *ndev)
1696 {
1697         struct net_device *dev = ndev;
1698         struct ieee80211_sub_if_data *sdata;
1699
1700         if (state != NETDEV_CHANGENAME)
1701                 return 0;
1702
1703         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1704                 return 0;
1705
1706         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1707                 return 0;
1708
1709         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1710
1711         memcpy(sdata->name, dev->name, IFNAMSIZ);
1712
1713         ieee80211_debugfs_rename_netdev(sdata);
1714         return 0;
1715 }
1716
1717 static struct notifier_block mac80211_netdev_notifier = {
1718         .notifier_call = netdev_notify,
1719 };
1720
1721 int ieee80211_iface_init(void)
1722 {
1723         return register_netdevice_notifier(&mac80211_netdev_notifier);
1724 }
1725
1726 void ieee80211_iface_exit(void)
1727 {
1728         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1729 }