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
  46 static u32 ieee80211_idle_off(struct ieee80211_local *local,
  47                               const char *reason)
  48 {
  49         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  50                 return 0;
  51
  52         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  53         return IEEE80211_CONF_CHANGE_IDLE;
  54 }
  55
  56 static u32 ieee80211_idle_on(struct ieee80211_local *local)
  57 {
  58         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  59                 return 0;
  60
  61         drv_flush(local, false);
  62
  63         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
  64         return IEEE80211_CONF_CHANGE_IDLE;
  65 }
  66
  67 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local)
  68 {
  69         struct ieee80211_sub_if_data *sdata;
  70         int count = 0;
  71         bool working = false, scanning = false;
  72         unsigned int led_trig_start = 0, led_trig_stop = 0;
  73         struct ieee80211_roc_work *roc;
  74
  75 #ifdef CONFIG_PROVE_LOCKING
  76         WARN_ON(debug_locks && !lockdep_rtnl_is_held() &&
  77                 !lockdep_is_held(&local->iflist_mtx));
  78 #endif
  79         lockdep_assert_held(&local->mtx);
  80
  81         list_for_each_entry(sdata, &local->interfaces, list) {
  82                 if (!ieee80211_sdata_running(sdata)) {
  83                         sdata->vif.bss_conf.idle = true;
  84                         continue;
  85                 }
  86
  87                 sdata->old_idle = sdata->vif.bss_conf.idle;
  88
  89                 /* do not count disabled managed interfaces */
  90                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
  91                     !sdata->u.mgd.associated &&
  92                     !sdata->u.mgd.auth_data &&
  93                     !sdata->u.mgd.assoc_data) {
  94                         sdata->vif.bss_conf.idle = true;
  95                         continue;
  96                 }
  97                 /* do not count unused IBSS interfaces */
  98                 if (sdata->vif.type == NL80211_IFTYPE_ADHOC &&
  99                     !sdata->u.ibss.ssid_len) {
 100                         sdata->vif.bss_conf.idle = true;
 101                         continue;
 102                 }
 103                 /* count everything else */
 104                 sdata->vif.bss_conf.idle = false;
 105                 count++;
 106         }
 107
 108         if (!local->ops->remain_on_channel) {
 109                 list_for_each_entry(roc, &local->roc_list, list) {
 110                         working = true;
 111                         roc->sdata->vif.bss_conf.idle = false;
 112                 }
 113         }
 114
 115         sdata = rcu_dereference_protected(local->scan_sdata,
 116                                           lockdep_is_held(&local->mtx));
 117         if (sdata && !(local->hw.flags & IEEE80211_HW_SCAN_WHILE_IDLE)) {
 118                 scanning = true;
 119                 sdata->vif.bss_conf.idle = false;
 120         }
 121
 122         list_for_each_entry(sdata, &local->interfaces, list) {
 123                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 124                     sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 125                         continue;
 126                 if (sdata->old_idle == sdata->vif.bss_conf.idle)
 127                         continue;
 128                 if (!ieee80211_sdata_running(sdata))
 129                         continue;
 130                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_IDLE);
 131         }
 132
 133         if (working || scanning)
 134                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 135         else
 136                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 137
 138         if (count)
 139                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 140         else
 141                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 142
 143         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 144
 145         if (working)
 146                 return ieee80211_idle_off(local, "working");
 147         if (scanning)
 148                 return ieee80211_idle_off(local, "scanning");
 149         if (!count)
 150                 return ieee80211_idle_on(local);
 151         else
 152                 return ieee80211_idle_off(local, "in use");
 153
 154         return 0;
 155 }
 156
 157 void ieee80211_recalc_idle(struct ieee80211_local *local)
 158 {
 159         u32 chg;
 160
 161         mutex_lock(&local->iflist_mtx);
 162         chg = __ieee80211_recalc_idle(local);
 163         mutex_unlock(&local->iflist_mtx);
 164         if (chg)
 165                 ieee80211_hw_config(local, chg);
 166 }
 167
 168 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 169 {
 170         int meshhdrlen;
 171         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 172
 173         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
 174
 175         /* FIX: what would be proper limits for MTU?
 176          * This interface uses 802.3 frames. */
 177         if (new_mtu < 256 ||
 178             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
 179                 return -EINVAL;
 180         }
 181
 182         dev->mtu = new_mtu;
 183         return 0;
 184 }
 185
 186 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 187 {
 188         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 189         struct sockaddr *sa = addr;
 190         int ret;
 191
 192         if (ieee80211_sdata_running(sdata))
 193                 return -EBUSY;
 194
 195         ret = eth_mac_addr(dev, sa);
 196
 197         if (ret == 0)
 198                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 199
 200         return ret;
 201 }
 202
 203 static inline int identical_mac_addr_allowed(int type1, int type2)
 204 {
 205         return type1 == NL80211_IFTYPE_MONITOR ||
 206                 type2 == NL80211_IFTYPE_MONITOR ||
 207                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 208                 (type1 == NL80211_IFTYPE_WDS &&
 209                         (type2 == NL80211_IFTYPE_WDS ||
 210                          type2 == NL80211_IFTYPE_AP)) ||
 211                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 212                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 213                         (type2 == NL80211_IFTYPE_AP ||
 214                          type2 == NL80211_IFTYPE_AP_VLAN));
 215 }
 216
 217 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 218                                             enum nl80211_iftype iftype)
 219 {
 220         struct ieee80211_local *local = sdata->local;
 221         struct ieee80211_sub_if_data *nsdata;
 222
 223         ASSERT_RTNL();
 224
 225         /* we hold the RTNL here so can safely walk the list */
 226         list_for_each_entry(nsdata, &local->interfaces, list) {
 227                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 228                         /*
 229                          * Allow only a single IBSS interface to be up at any
 230                          * time. This is restricted because beacon distribution
 231                          * cannot work properly if both are in the same IBSS.
 232                          *
 233                          * To remove this restriction we'd have to disallow them
 234                          * from setting the same SSID on different IBSS interfaces
 235                          * belonging to the same hardware. Then, however, we're
 236                          * faced with having to adopt two different TSF timers...
 237                          */
 238                         if (iftype == NL80211_IFTYPE_ADHOC &&
 239                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 240                                 return -EBUSY;
 241
 242                         /*
 243                          * The remaining checks are only performed for interfaces
 244                          * with the same MAC address.
 245                          */
 246                         if (!ether_addr_equal(sdata->vif.addr,
 247                                               nsdata->vif.addr))
 248                                 continue;
 249
 250                         /*
 251                          * check whether it may have the same address
 252                          */
 253                         if (!identical_mac_addr_allowed(iftype,
 254                                                         nsdata->vif.type))
 255                                 return -ENOTUNIQ;
 256
 257                         /*
 258                          * can only add VLANs to enabled APs
 259                          */
 260                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 261                             nsdata->vif.type == NL80211_IFTYPE_AP)
 262                                 sdata->bss = &nsdata->u.ap;
 263                 }
 264         }
 265
 266         return 0;
 267 }
 268
 269 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
 270 {
 271         int n_queues = sdata->local->hw.queues;
 272         int i;
 273
 274         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 275                 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 276                                  IEEE80211_INVAL_HW_QUEUE))
 277                         return -EINVAL;
 278                 if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 279                                  n_queues))
 280                         return -EINVAL;
 281         }
 282
 283         if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
 284             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
 285                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 286                 return 0;
 287         }
 288
 289         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 290                 return -EINVAL;
 291
 292         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 293                 return -EINVAL;
 294
 295         return 0;
 296 }
 297
 298 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 299                                     const int offset)
 300 {
 301         struct ieee80211_local *local = sdata->local;
 302         u32 flags = sdata->u.mntr_flags;
 303
 304 #define ADJUST(_f, _s)  do {                                    \
 305         if (flags & MONITOR_FLAG_##_f)                          \
 306                 local->fif_##_s += offset;                      \
 307         } while (0)
 308
 309         ADJUST(FCSFAIL, fcsfail);
 310         ADJUST(PLCPFAIL, plcpfail);
 311         ADJUST(CONTROL, control);
 312         ADJUST(CONTROL, pspoll);
 313         ADJUST(OTHER_BSS, other_bss);
 314
 315 #undef ADJUST
 316 }
 317
 318 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 319 {
 320         struct ieee80211_local *local = sdata->local;
 321         int i;
 322
 323         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 324                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
 325                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 326                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 327                         sdata->vif.hw_queue[i] = i;
 328                 else
 329                         sdata->vif.hw_queue[i] = 0;
 330         }
 331         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 332 }
 333
 334 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 335 {
 336         struct ieee80211_sub_if_data *sdata;
 337         int ret = 0;
 338
 339         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 340                 return 0;
 341
 342         mutex_lock(&local->iflist_mtx);
 343
 344         if (local->monitor_sdata)
 345                 goto out_unlock;
 346
 347         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 348         if (!sdata) {
 349                 ret = -ENOMEM;
 350                 goto out_unlock;
 351         }
 352
 353         /* set up data */
 354         sdata->local = local;
 355         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 356         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 357                  wiphy_name(local->hw.wiphy));
 358
 359         ieee80211_set_default_queues(sdata);
 360
 361         ret = drv_add_interface(local, sdata);
 362         if (WARN_ON(ret)) {
 363                 /* ok .. stupid driver, it asked for this! */
 364                 kfree(sdata);
 365                 goto out_unlock;
 366         }
 367
 368         ret = ieee80211_check_queues(sdata);
 369         if (ret) {
 370                 kfree(sdata);
 371                 goto out_unlock;
 372         }
 373
 374         rcu_assign_pointer(local->monitor_sdata, sdata);
 375  out_unlock:
 376         mutex_unlock(&local->iflist_mtx);
 377         return ret;
 378 }
 379
 380 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 381 {
 382         struct ieee80211_sub_if_data *sdata;
 383
 384         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 385                 return;
 386
 387         mutex_lock(&local->iflist_mtx);
 388
 389         sdata = rcu_dereference_protected(local->monitor_sdata,
 390                                           lockdep_is_held(&local->iflist_mtx));
 391         if (!sdata)
 392                 goto out_unlock;
 393
 394         rcu_assign_pointer(local->monitor_sdata, NULL);
 395         synchronize_net();
 396
 397         drv_remove_interface(local, sdata);
 398
 399         kfree(sdata);
 400  out_unlock:
 401         mutex_unlock(&local->iflist_mtx);
 402 }
 403
 404 /*
 405  * NOTE: Be very careful when changing this function, it must NOT return
 406  * an error on interface type changes that have been pre-checked, so most
 407  * checks should be in ieee80211_check_concurrent_iface.
 408  */
 409 static int ieee80211_do_open(struct net_device *dev, bool coming_up)
 410 {
 411         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 412         struct ieee80211_local *local = sdata->local;
 413         struct sta_info *sta;
 414         u32 changed = 0;
 415         int res;
 416         u32 hw_reconf_flags = 0;
 417
 418         switch (sdata->vif.type) {
 419         case NL80211_IFTYPE_WDS:
 420                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 421                         return -ENOLINK;
 422                 break;
 423         case NL80211_IFTYPE_AP_VLAN: {
 424                 struct ieee80211_sub_if_data *master;
 425
 426                 if (!sdata->bss)
 427                         return -ENOLINK;
 428
 429                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 430
 431                 master = container_of(sdata->bss,
 432                                       struct ieee80211_sub_if_data, u.ap);
 433                 sdata->control_port_protocol =
 434                         master->control_port_protocol;
 435                 sdata->control_port_no_encrypt =
 436                         master->control_port_no_encrypt;
 437                 break;
 438                 }
 439         case NL80211_IFTYPE_AP:
 440                 sdata->bss = &sdata->u.ap;
 441                 break;
 442         case NL80211_IFTYPE_MESH_POINT:
 443         case NL80211_IFTYPE_STATION:
 444         case NL80211_IFTYPE_MONITOR:
 445         case NL80211_IFTYPE_ADHOC:
 446                 /* no special treatment */
 447                 break;
 448         case NL80211_IFTYPE_UNSPECIFIED:
 449         case NUM_NL80211_IFTYPES:
 450         case NL80211_IFTYPE_P2P_CLIENT:
 451         case NL80211_IFTYPE_P2P_GO:
 452                 /* cannot happen */
 453                 WARN_ON(1);
 454                 break;
 455         }
 456
 457         if (local->open_count == 0) {
 458                 res = drv_start(local);
 459                 if (res)
 460                         goto err_del_bss;
 461                 if (local->ops->napi_poll)
 462                         napi_enable(&local->napi);
 463                 /* we're brought up, everything changes */
 464                 hw_reconf_flags = ~0;
 465                 ieee80211_led_radio(local, true);
 466                 ieee80211_mod_tpt_led_trig(local,
 467                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 468         }
 469
 470         /*
 471          * Copy the hopefully now-present MAC address to
 472          * this interface, if it has the special null one.
 473          */
 474         if (is_zero_ether_addr(dev->dev_addr)) {
 475                 memcpy(dev->dev_addr,
 476                        local->hw.wiphy->perm_addr,
 477                        ETH_ALEN);
 478                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 479
 480                 if (!is_valid_ether_addr(dev->dev_addr)) {
 481                         res = -EADDRNOTAVAIL;
 482                         goto err_stop;
 483                 }
 484         }
 485
 486         switch (sdata->vif.type) {
 487         case NL80211_IFTYPE_AP_VLAN:
 488                 /* no need to tell driver, but set carrier */
 489                 if (rtnl_dereference(sdata->bss->beacon))
 490                         netif_carrier_on(dev);
 491                 else
 492                         netif_carrier_off(dev);
 493                 break;
 494         case NL80211_IFTYPE_MONITOR:
 495                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 496                         local->cooked_mntrs++;
 497                         break;
 498                 }
 499
 500                 if (local->monitors == 0 && local->open_count == 0) {
 501                         res = ieee80211_add_virtual_monitor(local);
 502                         if (res)
 503                                 goto err_stop;
 504                 }
 505
 506                 /* must be before the call to ieee80211_configure_filter */
 507                 local->monitors++;
 508                 if (local->monitors == 1) {
 509                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 510                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 511                 }
 512
 513                 ieee80211_adjust_monitor_flags(sdata, 1);
 514                 ieee80211_configure_filter(local);
 515
 516                 netif_carrier_on(dev);
 517                 break;
 518         default:
 519                 if (coming_up) {
 520                         ieee80211_del_virtual_monitor(local);
 521
 522                         res = drv_add_interface(local, sdata);
 523                         if (res)
 524                                 goto err_stop;
 525                         res = ieee80211_check_queues(sdata);
 526                         if (res)
 527                                 goto err_del_interface;
 528                 }
 529
 530                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 531                         local->fif_pspoll++;
 532                         local->fif_probe_req++;
 533
 534                         ieee80211_configure_filter(local);
 535                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 536                         local->fif_probe_req++;
 537                 }
 538
 539                 changed |= ieee80211_reset_erp_info(sdata);
 540                 ieee80211_bss_info_change_notify(sdata, changed);
 541
 542                 switch (sdata->vif.type) {
 543                 case NL80211_IFTYPE_STATION:
 544                 case NL80211_IFTYPE_ADHOC:
 545                 case NL80211_IFTYPE_AP:
 546                 case NL80211_IFTYPE_MESH_POINT:
 547                         netif_carrier_off(dev);
 548                         break;
 549                 case NL80211_IFTYPE_WDS:
 550                         break;
 551                 default:
 552                         netif_carrier_on(dev);
 553                 }
 554
 555                 /*
 556                  * set default queue parameters so drivers don't
 557                  * need to initialise the hardware if the hardware
 558                  * doesn't start up with sane defaults
 559                  */
 560                 ieee80211_set_wmm_default(sdata, true);
 561         }
 562
 563         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 564
 565         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 566                 /* Create STA entry for the WDS peer */
 567                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 568                                      GFP_KERNEL);
 569                 if (!sta) {
 570                         res = -ENOMEM;
 571                         goto err_del_interface;
 572                 }
 573
 574                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 575                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 576                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 577
 578                 res = sta_info_insert(sta);
 579                 if (res) {
 580                         /* STA has been freed */
 581                         goto err_del_interface;
 582                 }
 583
 584                 rate_control_rate_init(sta);
 585                 netif_carrier_on(dev);
 586         }
 587
 588         /*
 589          * set_multicast_list will be invoked by the networking core
 590          * which will check whether any increments here were done in
 591          * error and sync them down to the hardware as filter flags.
 592          */
 593         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 594                 atomic_inc(&local->iff_allmultis);
 595
 596         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 597                 atomic_inc(&local->iff_promiscs);
 598
 599         mutex_lock(&local->mtx);
 600         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 601         mutex_unlock(&local->mtx);
 602
 603         if (coming_up)
 604                 local->open_count++;
 605
 606         if (hw_reconf_flags)
 607                 ieee80211_hw_config(local, hw_reconf_flags);
 608
 609         ieee80211_recalc_ps(local, -1);
 610
 611         netif_tx_start_all_queues(dev);
 612
 613         return 0;
 614  err_del_interface:
 615         drv_remove_interface(local, sdata);
 616  err_stop:
 617         if (!local->open_count)
 618                 drv_stop(local);
 619  err_del_bss:
 620         sdata->bss = NULL;
 621         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 622                 list_del(&sdata->u.vlan.list);
 623         /* might already be clear but that doesn't matter */
 624         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 625         return res;
 626 }
 627
 628 static int ieee80211_open(struct net_device *dev)
 629 {
 630         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 631         int err;
 632
 633         /* fail early if user set an invalid address */
 634         if (!is_valid_ether_addr(dev->dev_addr))
 635                 return -EADDRNOTAVAIL;
 636
 637         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 638         if (err)
 639                 return err;
 640
 641         return ieee80211_do_open(dev, true);
 642 }
 643
 644 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 645                               bool going_down)
 646 {
 647         struct ieee80211_local *local = sdata->local;
 648         unsigned long flags;
 649         struct sk_buff *skb, *tmp;
 650         u32 hw_reconf_flags = 0;
 651         int i;
 652         enum nl80211_channel_type orig_ct;
 653
 654         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 655
 656         if (rcu_access_pointer(local->scan_sdata) == sdata)
 657                 ieee80211_scan_cancel(local);
 658
 659         /*
 660          * Stop TX on this interface first.
 661          */
 662         netif_tx_stop_all_queues(sdata->dev);
 663
 664         ieee80211_roc_purge(sdata);
 665
 666         /*
 667          * Remove all stations associated with this interface.
 668          *
 669          * This must be done before calling ops->remove_interface()
 670          * because otherwise we can later invoke ops->sta_notify()
 671          * whenever the STAs are removed, and that invalidates driver
 672          * assumptions about always getting a vif pointer that is valid
 673          * (because if we remove a STA after ops->remove_interface()
 674          * the driver will have removed the vif info already!)
 675          *
 676          * This is relevant only in AP, WDS and mesh modes, since in
 677          * all other modes we've already removed all stations when
 678          * disconnecting etc.
 679          */
 680         sta_info_flush(local, sdata);
 681
 682         /*
 683          * Don't count this interface for promisc/allmulti while it
 684          * is down. dev_mc_unsync() will invoke set_multicast_list
 685          * on the master interface which will sync these down to the
 686          * hardware as filter flags.
 687          */
 688         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 689                 atomic_dec(&local->iff_allmultis);
 690
 691         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 692                 atomic_dec(&local->iff_promiscs);
 693
 694         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 695                 local->fif_pspoll--;
 696                 local->fif_probe_req--;
 697         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 698                 local->fif_probe_req--;
 699         }
 700
 701         netif_addr_lock_bh(sdata->dev);
 702         spin_lock_bh(&local->filter_lock);
 703         __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 704                          sdata->dev->addr_len);
 705         spin_unlock_bh(&local->filter_lock);
 706         netif_addr_unlock_bh(sdata->dev);
 707
 708         ieee80211_configure_filter(local);
 709
 710         del_timer_sync(&local->dynamic_ps_timer);
 711         cancel_work_sync(&local->dynamic_ps_enable_work);
 712
 713         /* APs need special treatment */
 714         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 715                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 716                 struct beacon_data *old_beacon =
 717                         rtnl_dereference(sdata->u.ap.beacon);
 718                 struct probe_resp *old_probe_resp =
 719                         rtnl_dereference(sdata->u.ap.probe_resp);
 720
 721                 /* sdata_running will return false, so this will disable */
 722                 ieee80211_bss_info_change_notify(sdata,
 723                                                  BSS_CHANGED_BEACON_ENABLED);
 724
 725                 /* remove beacon and probe response */
 726                 RCU_INIT_POINTER(sdata->u.ap.beacon, NULL);
 727                 RCU_INIT_POINTER(sdata->u.ap.probe_resp, NULL);
 728                 synchronize_rcu();
 729                 kfree(old_beacon);
 730                 kfree(old_probe_resp);
 731
 732                 /* down all dependent devices, that is VLANs */
 733                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 734                                          u.vlan.list)
 735                         dev_close(vlan->dev);
 736                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 737
 738                 /* free all potentially still buffered bcast frames */
 739                 local->total_ps_buffered -= skb_queue_len(&sdata->u.ap.ps_bc_buf);
 740                 skb_queue_purge(&sdata->u.ap.ps_bc_buf);
 741         } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 742                 ieee80211_mgd_stop(sdata);
 743         }
 744
 745         if (going_down)
 746                 local->open_count--;
 747
 748         switch (sdata->vif.type) {
 749         case NL80211_IFTYPE_AP_VLAN:
 750                 list_del(&sdata->u.vlan.list);
 751                 /* no need to tell driver */
 752                 break;
 753         case NL80211_IFTYPE_MONITOR:
 754                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 755                         local->cooked_mntrs--;
 756                         break;
 757                 }
 758
 759                 local->monitors--;
 760                 if (local->monitors == 0) {
 761                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 762                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 763                         ieee80211_del_virtual_monitor(local);
 764                 }
 765
 766                 ieee80211_adjust_monitor_flags(sdata, -1);
 767                 ieee80211_configure_filter(local);
 768                 break;
 769         default:
 770                 flush_work(&sdata->work);
 771                 /*
 772                  * When we get here, the interface is marked down.
 773                  * Call synchronize_rcu() to wait for the RX path
 774                  * should it be using the interface and enqueuing
 775                  * frames at this very time on another CPU.
 776                  */
 777                 synchronize_rcu();
 778                 skb_queue_purge(&sdata->skb_queue);
 779
 780                 /*
 781                  * Free all remaining keys, there shouldn't be any,
 782                  * except maybe group keys in AP more or WDS?
 783                  */
 784                 ieee80211_free_keys(sdata);
 785
 786                 if (going_down)
 787                         drv_remove_interface(local, sdata);
 788         }
 789
 790         sdata->bss = NULL;
 791
 792         mutex_lock(&local->mtx);
 793         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 794         mutex_unlock(&local->mtx);
 795
 796         ieee80211_recalc_ps(local, -1);
 797
 798         if (local->open_count == 0) {
 799                 if (local->ops->napi_poll)
 800                         napi_disable(&local->napi);
 801                 ieee80211_clear_tx_pending(local);
 802                 ieee80211_stop_device(local);
 803
 804                 /* no reconfiguring after stop! */
 805                 hw_reconf_flags = 0;
 806         }
 807
 808         /* Re-calculate channel-type, in case there are multiple vifs
 809          * on different channel types.
 810          */
 811         orig_ct = local->_oper_channel_type;
 812         ieee80211_set_channel_type(local, NULL, NL80211_CHAN_NO_HT);
 813
 814         /* do after stop to avoid reconfiguring when we stop anyway */
 815         if (hw_reconf_flags || (orig_ct != local->_oper_channel_type))
 816                 ieee80211_hw_config(local, hw_reconf_flags);
 817
 818         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 819         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 820                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 821                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 822                         if (info->control.vif == &sdata->vif) {
 823                                 __skb_unlink(skb, &local->pending[i]);
 824                                 dev_kfree_skb_irq(skb);
 825                         }
 826                 }
 827         }
 828         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 829
 830         if (local->monitors == local->open_count && local->monitors > 0)
 831                 ieee80211_add_virtual_monitor(local);
 832 }
 833
 834 static int ieee80211_stop(struct net_device *dev)
 835 {
 836         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 837
 838         ieee80211_do_stop(sdata, true);
 839
 840         return 0;
 841 }
 842
 843 static void ieee80211_set_multicast_list(struct net_device *dev)
 844 {
 845         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 846         struct ieee80211_local *local = sdata->local;
 847         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 848
 849         allmulti = !!(dev->flags & IFF_ALLMULTI);
 850         promisc = !!(dev->flags & IFF_PROMISC);
 851         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 852         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 853
 854         if (allmulti != sdata_allmulti) {
 855                 if (dev->flags & IFF_ALLMULTI)
 856                         atomic_inc(&local->iff_allmultis);
 857                 else
 858                         atomic_dec(&local->iff_allmultis);
 859                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 860         }
 861
 862         if (promisc != sdata_promisc) {
 863                 if (dev->flags & IFF_PROMISC)
 864                         atomic_inc(&local->iff_promiscs);
 865                 else
 866                         atomic_dec(&local->iff_promiscs);
 867                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 868         }
 869         spin_lock_bh(&local->filter_lock);
 870         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 871         spin_unlock_bh(&local->filter_lock);
 872         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 873 }
 874
 875 /*
 876  * Called when the netdev is removed or, by the code below, before
 877  * the interface type changes.
 878  */
 879 static void ieee80211_teardown_sdata(struct net_device *dev)
 880 {
 881         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 882         struct ieee80211_local *local = sdata->local;
 883         int flushed;
 884         int i;
 885
 886         /* free extra data */
 887         ieee80211_free_keys(sdata);
 888
 889         ieee80211_debugfs_remove_netdev(sdata);
 890
 891         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 892                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 893         sdata->fragment_next = 0;
 894
 895         if (ieee80211_vif_is_mesh(&sdata->vif))
 896                 mesh_rmc_free(sdata);
 897
 898         flushed = sta_info_flush(local, sdata);
 899         WARN_ON(flushed);
 900 }
 901
 902 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 903                                          struct sk_buff *skb)
 904 {
 905         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 906 }
 907
 908 static const struct net_device_ops ieee80211_dataif_ops = {
 909         .ndo_open               = ieee80211_open,
 910         .ndo_stop               = ieee80211_stop,
 911         .ndo_uninit             = ieee80211_teardown_sdata,
 912         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 913         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 914         .ndo_change_mtu         = ieee80211_change_mtu,
 915         .ndo_set_mac_address    = ieee80211_change_mac,
 916         .ndo_select_queue       = ieee80211_netdev_select_queue,
 917 };
 918
 919 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 920                                           struct sk_buff *skb)
 921 {
 922         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 923         struct ieee80211_local *local = sdata->local;
 924         struct ieee80211_hdr *hdr;
 925         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
 926
 927         if (local->hw.queues < IEEE80211_NUM_ACS)
 928                 return 0;
 929
 930         if (skb->len < 4 ||
 931             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
 932                 return 0; /* doesn't matter, frame will be dropped */
 933
 934         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
 935
 936         return ieee80211_select_queue_80211(sdata, skb, hdr);
 937 }
 938
 939 static const struct net_device_ops ieee80211_monitorif_ops = {
 940         .ndo_open               = ieee80211_open,
 941         .ndo_stop               = ieee80211_stop,
 942         .ndo_uninit             = ieee80211_teardown_sdata,
 943         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 944         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 945         .ndo_change_mtu         = ieee80211_change_mtu,
 946         .ndo_set_mac_address    = eth_mac_addr,
 947         .ndo_select_queue       = ieee80211_monitor_select_queue,
 948 };
 949
 950 static void ieee80211_if_setup(struct net_device *dev)
 951 {
 952         ether_setup(dev);
 953         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
 954         dev->netdev_ops = &ieee80211_dataif_ops;
 955         dev->destructor = free_netdev;
 956 }
 957
 958 static void ieee80211_iface_work(struct work_struct *work)
 959 {
 960         struct ieee80211_sub_if_data *sdata =
 961                 container_of(work, struct ieee80211_sub_if_data, work);
 962         struct ieee80211_local *local = sdata->local;
 963         struct sk_buff *skb;
 964         struct sta_info *sta;
 965         struct ieee80211_ra_tid *ra_tid;
 966
 967         if (!ieee80211_sdata_running(sdata))
 968                 return;
 969
 970         if (local->scanning)
 971                 return;
 972
 973         /*
 974          * ieee80211_queue_work() should have picked up most cases,
 975          * here we'll pick the rest.
 976          */
 977         if (WARN(local->suspended,
 978                  "interface work scheduled while going to suspend\n"))
 979                 return;
 980
 981         /* first process frames */
 982         while ((skb = skb_dequeue(&sdata->skb_queue))) {
 983                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
 984
 985                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
 986                         ra_tid = (void *)&skb->cb;
 987                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
 988                                                  ra_tid->tid);
 989                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
 990                         ra_tid = (void *)&skb->cb;
 991                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
 992                                                 ra_tid->tid);
 993                 } else if (ieee80211_is_action(mgmt->frame_control) &&
 994                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
 995                         int len = skb->len;
 996
 997                         mutex_lock(&local->sta_mtx);
 998                         sta = sta_info_get_bss(sdata, mgmt->sa);
 999                         if (sta) {
1000                                 switch (mgmt->u.action.u.addba_req.action_code) {
1001                                 case WLAN_ACTION_ADDBA_REQ:
1002                                         ieee80211_process_addba_request(
1003                                                         local, sta, mgmt, len);
1004                                         break;
1005                                 case WLAN_ACTION_ADDBA_RESP:
1006                                         ieee80211_process_addba_resp(local, sta,
1007                                                                      mgmt, len);
1008                                         break;
1009                                 case WLAN_ACTION_DELBA:
1010                                         ieee80211_process_delba(sdata, sta,
1011                                                                 mgmt, len);
1012                                         break;
1013                                 default:
1014                                         WARN_ON(1);
1015                                         break;
1016                                 }
1017                         }
1018                         mutex_unlock(&local->sta_mtx);
1019                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1020                         struct ieee80211_hdr *hdr = (void *)mgmt;
1021                         /*
1022                          * So the frame isn't mgmt, but frame_control
1023                          * is at the right place anyway, of course, so
1024                          * the if statement is correct.
1025                          *
1026                          * Warn if we have other data frame types here,
1027                          * they must not get here.
1028                          */
1029                         WARN_ON(hdr->frame_control &
1030                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1031                         WARN_ON(!(hdr->seq_ctrl &
1032                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1033                         /*
1034                          * This was a fragment of a frame, received while
1035                          * a block-ack session was active. That cannot be
1036                          * right, so terminate the session.
1037                          */
1038                         mutex_lock(&local->sta_mtx);
1039                         sta = sta_info_get_bss(sdata, mgmt->sa);
1040                         if (sta) {
1041                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1042                                                 IEEE80211_QOS_CTL_TID_MASK;
1043
1044                                 __ieee80211_stop_rx_ba_session(
1045                                         sta, tid, WLAN_BACK_RECIPIENT,
1046                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1047                                         true);
1048                         }
1049                         mutex_unlock(&local->sta_mtx);
1050                 } else switch (sdata->vif.type) {
1051                 case NL80211_IFTYPE_STATION:
1052                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1053                         break;
1054                 case NL80211_IFTYPE_ADHOC:
1055                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1056                         break;
1057                 case NL80211_IFTYPE_MESH_POINT:
1058                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1059                                 break;
1060                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1061                         break;
1062                 default:
1063                         WARN(1, "frame for unexpected interface type");
1064                         break;
1065                 }
1066
1067                 kfree_skb(skb);
1068         }
1069
1070         /* then other type-dependent work */
1071         switch (sdata->vif.type) {
1072         case NL80211_IFTYPE_STATION:
1073                 ieee80211_sta_work(sdata);
1074                 break;
1075         case NL80211_IFTYPE_ADHOC:
1076                 ieee80211_ibss_work(sdata);
1077                 break;
1078         case NL80211_IFTYPE_MESH_POINT:
1079                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1080                         break;
1081                 ieee80211_mesh_work(sdata);
1082                 break;
1083         default:
1084                 break;
1085         }
1086 }
1087
1088
1089 /*
1090  * Helper function to initialise an interface to a specific type.
1091  */
1092 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1093                                   enum nl80211_iftype type)
1094 {
1095         /* clear type-dependent union */
1096         memset(&sdata->u, 0, sizeof(sdata->u));
1097
1098         /* and set some type-dependent values */
1099         sdata->vif.type = type;
1100         sdata->vif.p2p = false;
1101         sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1102         sdata->wdev.iftype = type;
1103
1104         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1105         sdata->control_port_no_encrypt = false;
1106
1107         sdata->noack_map = 0;
1108
1109         /* only monitor differs */
1110         sdata->dev->type = ARPHRD_ETHER;
1111
1112         skb_queue_head_init(&sdata->skb_queue);
1113         INIT_WORK(&sdata->work, ieee80211_iface_work);
1114
1115         switch (type) {
1116         case NL80211_IFTYPE_P2P_GO:
1117                 type = NL80211_IFTYPE_AP;
1118                 sdata->vif.type = type;
1119                 sdata->vif.p2p = true;
1120                 /* fall through */
1121         case NL80211_IFTYPE_AP:
1122                 skb_queue_head_init(&sdata->u.ap.ps_bc_buf);
1123                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1124                 break;
1125         case NL80211_IFTYPE_P2P_CLIENT:
1126                 type = NL80211_IFTYPE_STATION;
1127                 sdata->vif.type = type;
1128                 sdata->vif.p2p = true;
1129                 /* fall through */
1130         case NL80211_IFTYPE_STATION:
1131                 ieee80211_sta_setup_sdata(sdata);
1132                 break;
1133         case NL80211_IFTYPE_ADHOC:
1134                 ieee80211_ibss_setup_sdata(sdata);
1135                 break;
1136         case NL80211_IFTYPE_MESH_POINT:
1137                 if (ieee80211_vif_is_mesh(&sdata->vif))
1138                         ieee80211_mesh_init_sdata(sdata);
1139                 break;
1140         case NL80211_IFTYPE_MONITOR:
1141                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1142                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1143                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1144                                       MONITOR_FLAG_OTHER_BSS;
1145                 break;
1146         case NL80211_IFTYPE_WDS:
1147         case NL80211_IFTYPE_AP_VLAN:
1148                 break;
1149         case NL80211_IFTYPE_UNSPECIFIED:
1150         case NUM_NL80211_IFTYPES:
1151                 BUG();
1152                 break;
1153         }
1154
1155         ieee80211_debugfs_add_netdev(sdata);
1156 }
1157
1158 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1159                                            enum nl80211_iftype type)
1160 {
1161         struct ieee80211_local *local = sdata->local;
1162         int ret, err;
1163         enum nl80211_iftype internal_type = type;
1164         bool p2p = false;
1165
1166         ASSERT_RTNL();
1167
1168         if (!local->ops->change_interface)
1169                 return -EBUSY;
1170
1171         switch (sdata->vif.type) {
1172         case NL80211_IFTYPE_AP:
1173         case NL80211_IFTYPE_STATION:
1174         case NL80211_IFTYPE_ADHOC:
1175                 /*
1176                  * Could maybe also all others here?
1177                  * Just not sure how that interacts
1178                  * with the RX/config path e.g. for
1179                  * mesh.
1180                  */
1181                 break;
1182         default:
1183                 return -EBUSY;
1184         }
1185
1186         switch (type) {
1187         case NL80211_IFTYPE_AP:
1188         case NL80211_IFTYPE_STATION:
1189         case NL80211_IFTYPE_ADHOC:
1190                 /*
1191                  * Could probably support everything
1192                  * but WDS here (WDS do_open can fail
1193                  * under memory pressure, which this
1194                  * code isn't prepared to handle).
1195                  */
1196                 break;
1197         case NL80211_IFTYPE_P2P_CLIENT:
1198                 p2p = true;
1199                 internal_type = NL80211_IFTYPE_STATION;
1200                 break;
1201         case NL80211_IFTYPE_P2P_GO:
1202                 p2p = true;
1203                 internal_type = NL80211_IFTYPE_AP;
1204                 break;
1205         default:
1206                 return -EBUSY;
1207         }
1208
1209         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1210         if (ret)
1211                 return ret;
1212
1213         ieee80211_do_stop(sdata, false);
1214
1215         ieee80211_teardown_sdata(sdata->dev);
1216
1217         ret = drv_change_interface(local, sdata, internal_type, p2p);
1218         if (ret)
1219                 type = sdata->vif.type;
1220
1221         /*
1222          * Ignore return value here, there's not much we can do since
1223          * the driver changed the interface type internally already.
1224          * The warnings will hopefully make driver authors fix it :-)
1225          */
1226         ieee80211_check_queues(sdata);
1227
1228         ieee80211_setup_sdata(sdata, type);
1229
1230         err = ieee80211_do_open(sdata->dev, false);
1231         WARN(err, "type change: do_open returned %d", err);
1232
1233         return ret;
1234 }
1235
1236 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1237                              enum nl80211_iftype type)
1238 {
1239         int ret;
1240
1241         ASSERT_RTNL();
1242
1243         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1244                 return 0;
1245
1246         /* Setting ad-hoc mode on non-IBSS channel is not supported. */
1247         if (sdata->local->oper_channel->flags & IEEE80211_CHAN_NO_IBSS &&
1248             type == NL80211_IFTYPE_ADHOC)
1249                 return -EOPNOTSUPP;
1250
1251         if (ieee80211_sdata_running(sdata)) {
1252                 ret = ieee80211_runtime_change_iftype(sdata, type);
1253                 if (ret)
1254                         return ret;
1255         } else {
1256                 /* Purge and reset type-dependent state. */
1257                 ieee80211_teardown_sdata(sdata->dev);
1258                 ieee80211_setup_sdata(sdata, type);
1259         }
1260
1261         /* reset some values that shouldn't be kept across type changes */
1262         sdata->vif.bss_conf.basic_rates =
1263                 ieee80211_mandatory_rates(sdata->local,
1264                         sdata->local->oper_channel->band);
1265         sdata->drop_unencrypted = 0;
1266         if (type == NL80211_IFTYPE_STATION)
1267                 sdata->u.mgd.use_4addr = false;
1268
1269         return 0;
1270 }
1271
1272 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1273                                        struct net_device *dev,
1274                                        enum nl80211_iftype type)
1275 {
1276         struct ieee80211_sub_if_data *sdata;
1277         u64 mask, start, addr, val, inc;
1278         u8 *m;
1279         u8 tmp_addr[ETH_ALEN];
1280         int i;
1281
1282         /* default ... something at least */
1283         memcpy(dev->perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1284
1285         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1286             local->hw.wiphy->n_addresses <= 1)
1287                 return;
1288
1289
1290         mutex_lock(&local->iflist_mtx);
1291
1292         switch (type) {
1293         case NL80211_IFTYPE_MONITOR:
1294                 /* doesn't matter */
1295                 break;
1296         case NL80211_IFTYPE_WDS:
1297         case NL80211_IFTYPE_AP_VLAN:
1298                 /* match up with an AP interface */
1299                 list_for_each_entry(sdata, &local->interfaces, list) {
1300                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1301                                 continue;
1302                         memcpy(dev->perm_addr, sdata->vif.addr, ETH_ALEN);
1303                         break;
1304                 }
1305                 /* keep default if no AP interface present */
1306                 break;
1307         default:
1308                 /* assign a new address if possible -- try n_addresses first */
1309                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1310                         bool used = false;
1311
1312                         list_for_each_entry(sdata, &local->interfaces, list) {
1313                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1314                                            sdata->vif.addr, ETH_ALEN) == 0) {
1315                                         used = true;
1316                                         break;
1317                                 }
1318                         }
1319
1320                         if (!used) {
1321                                 memcpy(dev->perm_addr,
1322                                        local->hw.wiphy->addresses[i].addr,
1323                                        ETH_ALEN);
1324                                 break;
1325                         }
1326                 }
1327
1328                 /* try mask if available */
1329                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1330                         break;
1331
1332                 m = local->hw.wiphy->addr_mask;
1333                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1334                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1335                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1336
1337                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1338                         /* not a contiguous mask ... not handled now! */
1339                         pr_info("not contiguous\n");
1340                         break;
1341                 }
1342
1343                 m = local->hw.wiphy->perm_addr;
1344                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1345                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1346                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1347
1348                 inc = 1ULL<<__ffs64(mask);
1349                 val = (start & mask);
1350                 addr = (start & ~mask) | (val & mask);
1351                 do {
1352                         bool used = false;
1353
1354                         tmp_addr[5] = addr >> 0*8;
1355                         tmp_addr[4] = addr >> 1*8;
1356                         tmp_addr[3] = addr >> 2*8;
1357                         tmp_addr[2] = addr >> 3*8;
1358                         tmp_addr[1] = addr >> 4*8;
1359                         tmp_addr[0] = addr >> 5*8;
1360
1361                         val += inc;
1362
1363                         list_for_each_entry(sdata, &local->interfaces, list) {
1364                                 if (memcmp(tmp_addr, sdata->vif.addr,
1365                                                         ETH_ALEN) == 0) {
1366                                         used = true;
1367                                         break;
1368                                 }
1369                         }
1370
1371                         if (!used) {
1372                                 memcpy(dev->perm_addr, tmp_addr, ETH_ALEN);
1373                                 break;
1374                         }
1375                         addr = (start & ~mask) | (val & mask);
1376                 } while (addr != start);
1377
1378                 break;
1379         }
1380
1381         mutex_unlock(&local->iflist_mtx);
1382 }
1383
1384 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1385                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1386                      struct vif_params *params)
1387 {
1388         struct net_device *ndev;
1389         struct ieee80211_sub_if_data *sdata = NULL;
1390         int ret, i;
1391         int txqs = 1;
1392
1393         ASSERT_RTNL();
1394
1395         if (local->hw.queues >= IEEE80211_NUM_ACS)
1396                 txqs = IEEE80211_NUM_ACS;
1397
1398         ndev = alloc_netdev_mqs(sizeof(*sdata) + local->hw.vif_data_size,
1399                                 name, ieee80211_if_setup, txqs, 1);
1400         if (!ndev)
1401                 return -ENOMEM;
1402         dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1403
1404         ndev->needed_headroom = local->tx_headroom +
1405                                 4*6 /* four MAC addresses */
1406                                 + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1407                                 + 6 /* mesh */
1408                                 + 8 /* rfc1042/bridge tunnel */
1409                                 - ETH_HLEN /* ethernet hard_header_len */
1410                                 + IEEE80211_ENCRYPT_HEADROOM;
1411         ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1412
1413         ret = dev_alloc_name(ndev, ndev->name);
1414         if (ret < 0)
1415                 goto fail;
1416
1417         ieee80211_assign_perm_addr(local, ndev, type);
1418         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1419         SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1420
1421         /* don't use IEEE80211_DEV_TO_SUB_IF because it checks too much */
1422         sdata = netdev_priv(ndev);
1423         ndev->ieee80211_ptr = &sdata->wdev;
1424         memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1425         memcpy(sdata->name, ndev->name, IFNAMSIZ);
1426
1427         /* initialise type-independent data */
1428         sdata->wdev.wiphy = local->hw.wiphy;
1429         sdata->local = local;
1430         sdata->dev = ndev;
1431 #ifdef CONFIG_INET
1432         sdata->arp_filter_state = true;
1433 #endif
1434
1435         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1436                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1437
1438         INIT_LIST_HEAD(&sdata->key_list);
1439
1440         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1441                 struct ieee80211_supported_band *sband;
1442                 sband = local->hw.wiphy->bands[i];
1443                 sdata->rc_rateidx_mask[i] =
1444                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1445                 if (sband)
1446                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1447                                sband->ht_cap.mcs.rx_mask,
1448                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1449                 else
1450                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1451                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1452         }
1453
1454         ieee80211_set_default_queues(sdata);
1455
1456         /* setup type-dependent data */
1457         ieee80211_setup_sdata(sdata, type);
1458
1459         if (params) {
1460                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1461                 if (type == NL80211_IFTYPE_STATION)
1462                         sdata->u.mgd.use_4addr = params->use_4addr;
1463         }
1464
1465         ndev->features |= local->hw.netdev_features;
1466
1467         ret = register_netdevice(ndev);
1468         if (ret)
1469                 goto fail;
1470
1471         mutex_lock(&local->iflist_mtx);
1472         list_add_tail_rcu(&sdata->list, &local->interfaces);
1473         mutex_unlock(&local->iflist_mtx);
1474
1475         if (new_wdev)
1476                 *new_wdev = &sdata->wdev;
1477
1478         return 0;
1479
1480  fail:
1481         free_netdev(ndev);
1482         return ret;
1483 }
1484
1485 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1486 {
1487         ASSERT_RTNL();
1488
1489         mutex_lock(&sdata->local->iflist_mtx);
1490         list_del_rcu(&sdata->list);
1491         mutex_unlock(&sdata->local->iflist_mtx);
1492
1493         synchronize_rcu();
1494         unregister_netdevice(sdata->dev);
1495 }
1496
1497 /*
1498  * Remove all interfaces, may only be called at hardware unregistration
1499  * time because it doesn't do RCU-safe list removals.
1500  */
1501 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1502 {
1503         struct ieee80211_sub_if_data *sdata, *tmp;
1504         LIST_HEAD(unreg_list);
1505
1506         ASSERT_RTNL();
1507
1508         mutex_lock(&local->iflist_mtx);
1509         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1510                 list_del(&sdata->list);
1511
1512                 unregister_netdevice_queue(sdata->dev, &unreg_list);
1513         }
1514         mutex_unlock(&local->iflist_mtx);
1515         unregister_netdevice_many(&unreg_list);
1516         list_del(&unreg_list);
1517 }
1518
1519 static int netdev_notify(struct notifier_block *nb,
1520                          unsigned long state,
1521                          void *ndev)
1522 {
1523         struct net_device *dev = ndev;
1524         struct ieee80211_sub_if_data *sdata;
1525
1526         if (state != NETDEV_CHANGENAME)
1527                 return 0;
1528
1529         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1530                 return 0;
1531
1532         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1533                 return 0;
1534
1535         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1536
1537         memcpy(sdata->name, dev->name, IFNAMSIZ);
1538
1539         ieee80211_debugfs_rename_netdev(sdata);
1540         return 0;
1541 }
1542
1543 static struct notifier_block mac80211_netdev_notifier = {
1544         .notifier_call = netdev_notify,
1545 };
1546
1547 int ieee80211_iface_init(void)
1548 {
1549         return register_netdevice_notifier(&mac80211_netdev_notifier);
1550 }
1551
1552 void ieee80211_iface_exit(void)
1553 {
1554         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1555 }