Pileus Git - ~andy/linux/blob - 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         int meshhdrlen;
 211         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 212
 213         meshhdrlen = (sdata->vif.type == NL80211_IFTYPE_MESH_POINT) ? 5 : 0;
 214
 215         /* FIX: what would be proper limits for MTU?
 216          * This interface uses 802.3 frames. */
 217         if (new_mtu < 256 ||
 218             new_mtu > IEEE80211_MAX_DATA_LEN - 24 - 6 - meshhdrlen) {
 219                 return -EINVAL;
 220         }
 221
 222         dev->mtu = new_mtu;
 223         return 0;
 224 }
 225
 226 static int ieee80211_verify_mac(struct ieee80211_local *local, u8 *addr)
 227 {
 228         struct ieee80211_sub_if_data *sdata;
 229         u64 new, mask, tmp;
 230         u8 *m;
 231         int ret = 0;
 232
 233         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 234                 return 0;
 235
 236         m = addr;
 237         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 238                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 239                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 240
 241         m = local->hw.wiphy->addr_mask;
 242         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 243                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 244                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 245
 246
 247         mutex_lock(&local->iflist_mtx);
 248         list_for_each_entry(sdata, &local->interfaces, list) {
 249                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
 250                         continue;
 251
 252                 m = sdata->vif.addr;
 253                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 254                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 255                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 256
 257                 if ((new & ~mask) != (tmp & ~mask)) {
 258                         ret = -EINVAL;
 259                         break;
 260                 }
 261         }
 262         mutex_unlock(&local->iflist_mtx);
 263
 264         return ret;
 265 }
 266
 267 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 268 {
 269         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 270         struct sockaddr *sa = addr;
 271         int ret;
 272
 273         if (ieee80211_sdata_running(sdata))
 274                 return -EBUSY;
 275
 276         ret = ieee80211_verify_mac(sdata->local, sa->sa_data);
 277         if (ret)
 278                 return ret;
 279
 280         ret = eth_mac_addr(dev, sa);
 281
 282         if (ret == 0)
 283                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 284
 285         return ret;
 286 }
 287
 288 static inline int identical_mac_addr_allowed(int type1, int type2)
 289 {
 290         return type1 == NL80211_IFTYPE_MONITOR ||
 291                 type2 == NL80211_IFTYPE_MONITOR ||
 292                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 293                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 294                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 295                 (type1 == NL80211_IFTYPE_WDS &&
 296                         (type2 == NL80211_IFTYPE_WDS ||
 297                          type2 == NL80211_IFTYPE_AP)) ||
 298                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 299                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 300                         (type2 == NL80211_IFTYPE_AP ||
 301                          type2 == NL80211_IFTYPE_AP_VLAN));
 302 }
 303
 304 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 305                                             enum nl80211_iftype iftype)
 306 {
 307         struct ieee80211_local *local = sdata->local;
 308         struct ieee80211_sub_if_data *nsdata;
 309
 310         ASSERT_RTNL();
 311
 312         /* we hold the RTNL here so can safely walk the list */
 313         list_for_each_entry(nsdata, &local->interfaces, list) {
 314                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 315                         /*
 316                          * Allow only a single IBSS interface to be up at any
 317                          * time. This is restricted because beacon distribution
 318                          * cannot work properly if both are in the same IBSS.
 319                          *
 320                          * To remove this restriction we'd have to disallow them
 321                          * from setting the same SSID on different IBSS interfaces
 322                          * belonging to the same hardware. Then, however, we're
 323                          * faced with having to adopt two different TSF timers...
 324                          */
 325                         if (iftype == NL80211_IFTYPE_ADHOC &&
 326                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 327                                 return -EBUSY;
 328
 329                         /*
 330                          * The remaining checks are only performed for interfaces
 331                          * with the same MAC address.
 332                          */
 333                         if (!ether_addr_equal(sdata->vif.addr,
 334                                               nsdata->vif.addr))
 335                                 continue;
 336
 337                         /*
 338                          * check whether it may have the same address
 339                          */
 340                         if (!identical_mac_addr_allowed(iftype,
 341                                                         nsdata->vif.type))
 342                                 return -ENOTUNIQ;
 343
 344                         /*
 345                          * can only add VLANs to enabled APs
 346                          */
 347                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 348                             nsdata->vif.type == NL80211_IFTYPE_AP)
 349                                 sdata->bss = &nsdata->u.ap;
 350                 }
 351         }
 352
 353         return 0;
 354 }
 355
 356 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
 357 {
 358         int n_queues = sdata->local->hw.queues;
 359         int i;
 360
 361         if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
 362                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 363                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 364                                          IEEE80211_INVAL_HW_QUEUE))
 365                                 return -EINVAL;
 366                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 367                                          n_queues))
 368                                 return -EINVAL;
 369                 }
 370         }
 371
 372         if ((sdata->vif.type != NL80211_IFTYPE_AP) ||
 373             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
 374                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 375                 return 0;
 376         }
 377
 378         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 379                 return -EINVAL;
 380
 381         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 382                 return -EINVAL;
 383
 384         return 0;
 385 }
 386
 387 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 388                                     const int offset)
 389 {
 390         struct ieee80211_local *local = sdata->local;
 391         u32 flags = sdata->u.mntr_flags;
 392
 393 #define ADJUST(_f, _s)  do {                                    \
 394         if (flags & MONITOR_FLAG_##_f)                          \
 395                 local->fif_##_s += offset;                      \
 396         } while (0)
 397
 398         ADJUST(FCSFAIL, fcsfail);
 399         ADJUST(PLCPFAIL, plcpfail);
 400         ADJUST(CONTROL, control);
 401         ADJUST(CONTROL, pspoll);
 402         ADJUST(OTHER_BSS, other_bss);
 403
 404 #undef ADJUST
 405 }
 406
 407 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 408 {
 409         struct ieee80211_local *local = sdata->local;
 410         int i;
 411
 412         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 413                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
 414                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 415                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 416                         sdata->vif.hw_queue[i] = i;
 417                 else
 418                         sdata->vif.hw_queue[i] = 0;
 419         }
 420         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 421 }
 422
 423 static int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 424 {
 425         struct ieee80211_sub_if_data *sdata;
 426         int ret = 0;
 427
 428         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 429                 return 0;
 430
 431         mutex_lock(&local->iflist_mtx);
 432
 433         if (local->monitor_sdata)
 434                 goto out_unlock;
 435
 436         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 437         if (!sdata) {
 438                 ret = -ENOMEM;
 439                 goto out_unlock;
 440         }
 441
 442         /* set up data */
 443         sdata->local = local;
 444         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 445         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 446                  wiphy_name(local->hw.wiphy));
 447
 448         ieee80211_set_default_queues(sdata);
 449
 450         ret = drv_add_interface(local, sdata);
 451         if (WARN_ON(ret)) {
 452                 /* ok .. stupid driver, it asked for this! */
 453                 kfree(sdata);
 454                 goto out_unlock;
 455         }
 456
 457         ret = ieee80211_check_queues(sdata);
 458         if (ret) {
 459                 kfree(sdata);
 460                 goto out_unlock;
 461         }
 462
 463         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 464                                         IEEE80211_CHANCTX_EXCLUSIVE);
 465         if (ret) {
 466                 drv_remove_interface(local, sdata);
 467                 kfree(sdata);
 468                 goto out_unlock;
 469         }
 470
 471         rcu_assign_pointer(local->monitor_sdata, sdata);
 472  out_unlock:
 473         mutex_unlock(&local->iflist_mtx);
 474         return ret;
 475 }
 476
 477 static void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 478 {
 479         struct ieee80211_sub_if_data *sdata;
 480
 481         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 482                 return;
 483
 484         mutex_lock(&local->iflist_mtx);
 485
 486         sdata = rcu_dereference_protected(local->monitor_sdata,
 487                                           lockdep_is_held(&local->iflist_mtx));
 488         if (!sdata)
 489                 goto out_unlock;
 490
 491         rcu_assign_pointer(local->monitor_sdata, NULL);
 492         synchronize_net();
 493
 494         ieee80211_vif_release_channel(sdata);
 495
 496         drv_remove_interface(local, sdata);
 497
 498         kfree(sdata);
 499  out_unlock:
 500         mutex_unlock(&local->iflist_mtx);
 501 }
 502
 503 /*
 504  * NOTE: Be very careful when changing this function, it must NOT return
 505  * an error on interface type changes that have been pre-checked, so most
 506  * checks should be in ieee80211_check_concurrent_iface.
 507  */
 508 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 509 {
 510         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 511         struct net_device *dev = wdev->netdev;
 512         struct ieee80211_local *local = sdata->local;
 513         struct sta_info *sta;
 514         u32 changed = 0;
 515         int res;
 516         u32 hw_reconf_flags = 0;
 517
 518         switch (sdata->vif.type) {
 519         case NL80211_IFTYPE_WDS:
 520                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 521                         return -ENOLINK;
 522                 break;
 523         case NL80211_IFTYPE_AP_VLAN: {
 524                 struct ieee80211_sub_if_data *master;
 525
 526                 if (!sdata->bss)
 527                         return -ENOLINK;
 528
 529                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 530
 531                 master = container_of(sdata->bss,
 532                                       struct ieee80211_sub_if_data, u.ap);
 533                 sdata->control_port_protocol =
 534                         master->control_port_protocol;
 535                 sdata->control_port_no_encrypt =
 536                         master->control_port_no_encrypt;
 537                 break;
 538                 }
 539         case NL80211_IFTYPE_AP:
 540                 sdata->bss = &sdata->u.ap;
 541                 break;
 542         case NL80211_IFTYPE_MESH_POINT:
 543         case NL80211_IFTYPE_STATION:
 544         case NL80211_IFTYPE_MONITOR:
 545         case NL80211_IFTYPE_ADHOC:
 546         case NL80211_IFTYPE_P2P_DEVICE:
 547                 /* no special treatment */
 548                 break;
 549         case NL80211_IFTYPE_UNSPECIFIED:
 550         case NUM_NL80211_IFTYPES:
 551         case NL80211_IFTYPE_P2P_CLIENT:
 552         case NL80211_IFTYPE_P2P_GO:
 553                 /* cannot happen */
 554                 WARN_ON(1);
 555                 break;
 556         }
 557
 558         if (local->open_count == 0) {
 559                 res = drv_start(local);
 560                 if (res)
 561                         goto err_del_bss;
 562                 if (local->ops->napi_poll)
 563                         napi_enable(&local->napi);
 564                 /* we're brought up, everything changes */
 565                 hw_reconf_flags = ~0;
 566                 ieee80211_led_radio(local, true);
 567                 ieee80211_mod_tpt_led_trig(local,
 568                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 569         }
 570
 571         /*
 572          * Copy the hopefully now-present MAC address to
 573          * this interface, if it has the special null one.
 574          */
 575         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 576                 memcpy(dev->dev_addr,
 577                        local->hw.wiphy->perm_addr,
 578                        ETH_ALEN);
 579                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 580
 581                 if (!is_valid_ether_addr(dev->dev_addr)) {
 582                         res = -EADDRNOTAVAIL;
 583                         goto err_stop;
 584                 }
 585         }
 586
 587         switch (sdata->vif.type) {
 588         case NL80211_IFTYPE_AP_VLAN:
 589                 /* no need to tell driver, but set carrier and chanctx */
 590                 if (rtnl_dereference(sdata->bss->beacon)) {
 591                         ieee80211_vif_vlan_copy_chanctx(sdata);
 592                         netif_carrier_on(dev);
 593                 } else {
 594                         netif_carrier_off(dev);
 595                 }
 596                 break;
 597         case NL80211_IFTYPE_MONITOR:
 598                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 599                         local->cooked_mntrs++;
 600                         break;
 601                 }
 602
 603                 if (local->monitors == 0 && local->open_count == 0) {
 604                         res = ieee80211_add_virtual_monitor(local);
 605                         if (res)
 606                                 goto err_stop;
 607                 }
 608
 609                 /* must be before the call to ieee80211_configure_filter */
 610                 local->monitors++;
 611                 if (local->monitors == 1) {
 612                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 613                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 614                 }
 615
 616                 ieee80211_adjust_monitor_flags(sdata, 1);
 617                 ieee80211_configure_filter(local);
 618
 619                 netif_carrier_on(dev);
 620                 break;
 621         default:
 622                 if (coming_up) {
 623                         ieee80211_del_virtual_monitor(local);
 624
 625                         res = drv_add_interface(local, sdata);
 626                         if (res)
 627                                 goto err_stop;
 628                         res = ieee80211_check_queues(sdata);
 629                         if (res)
 630                                 goto err_del_interface;
 631                 }
 632
 633                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 634                         local->fif_pspoll++;
 635                         local->fif_probe_req++;
 636
 637                         ieee80211_configure_filter(local);
 638                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 639                         local->fif_probe_req++;
 640                 }
 641
 642                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 643                         changed |= ieee80211_reset_erp_info(sdata);
 644                 ieee80211_bss_info_change_notify(sdata, changed);
 645
 646                 switch (sdata->vif.type) {
 647                 case NL80211_IFTYPE_STATION:
 648                 case NL80211_IFTYPE_ADHOC:
 649                 case NL80211_IFTYPE_AP:
 650                 case NL80211_IFTYPE_MESH_POINT:
 651                         netif_carrier_off(dev);
 652                         break;
 653                 case NL80211_IFTYPE_WDS:
 654                 case NL80211_IFTYPE_P2P_DEVICE:
 655                         break;
 656                 default:
 657                         netif_carrier_on(dev);
 658                 }
 659
 660                 /*
 661                  * set default queue parameters so drivers don't
 662                  * need to initialise the hardware if the hardware
 663                  * doesn't start up with sane defaults
 664                  */
 665                 ieee80211_set_wmm_default(sdata, true);
 666         }
 667
 668         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 669
 670         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 671                 /* Create STA entry for the WDS peer */
 672                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 673                                      GFP_KERNEL);
 674                 if (!sta) {
 675                         res = -ENOMEM;
 676                         goto err_del_interface;
 677                 }
 678
 679                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 680                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 681                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 682
 683                 res = sta_info_insert(sta);
 684                 if (res) {
 685                         /* STA has been freed */
 686                         goto err_del_interface;
 687                 }
 688
 689                 rate_control_rate_init(sta);
 690                 netif_carrier_on(dev);
 691         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 692                 rcu_assign_pointer(local->p2p_sdata, sdata);
 693         }
 694
 695         /*
 696          * set_multicast_list will be invoked by the networking core
 697          * which will check whether any increments here were done in
 698          * error and sync them down to the hardware as filter flags.
 699          */
 700         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 701                 atomic_inc(&local->iff_allmultis);
 702
 703         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 704                 atomic_inc(&local->iff_promiscs);
 705
 706         mutex_lock(&local->mtx);
 707         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 708         mutex_unlock(&local->mtx);
 709
 710         if (coming_up)
 711                 local->open_count++;
 712
 713         if (hw_reconf_flags)
 714                 ieee80211_hw_config(local, hw_reconf_flags);
 715
 716         ieee80211_recalc_ps(local, -1);
 717
 718         if (dev)
 719                 netif_tx_start_all_queues(dev);
 720
 721         return 0;
 722  err_del_interface:
 723         drv_remove_interface(local, sdata);
 724  err_stop:
 725         if (!local->open_count)
 726                 drv_stop(local);
 727  err_del_bss:
 728         sdata->bss = NULL;
 729         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 730                 list_del(&sdata->u.vlan.list);
 731         /* might already be clear but that doesn't matter */
 732         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 733         return res;
 734 }
 735
 736 static int ieee80211_open(struct net_device *dev)
 737 {
 738         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 739         int err;
 740
 741         /* fail early if user set an invalid address */
 742         if (!is_valid_ether_addr(dev->dev_addr))
 743                 return -EADDRNOTAVAIL;
 744
 745         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 746         if (err)
 747                 return err;
 748
 749         return ieee80211_do_open(&sdata->wdev, true);
 750 }
 751
 752 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 753                               bool going_down)
 754 {
 755         struct ieee80211_local *local = sdata->local;
 756         unsigned long flags;
 757         struct sk_buff *skb, *tmp;
 758         u32 hw_reconf_flags = 0;
 759         int i;
 760
 761         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 762
 763         if (rcu_access_pointer(local->scan_sdata) == sdata)
 764                 ieee80211_scan_cancel(local);
 765
 766         /*
 767          * Stop TX on this interface first.
 768          */
 769         if (sdata->dev)
 770                 netif_tx_stop_all_queues(sdata->dev);
 771
 772         ieee80211_roc_purge(sdata);
 773
 774         /*
 775          * Remove all stations associated with this interface.
 776          *
 777          * This must be done before calling ops->remove_interface()
 778          * because otherwise we can later invoke ops->sta_notify()
 779          * whenever the STAs are removed, and that invalidates driver
 780          * assumptions about always getting a vif pointer that is valid
 781          * (because if we remove a STA after ops->remove_interface()
 782          * the driver will have removed the vif info already!)
 783          *
 784          * This is relevant only in AP, WDS and mesh modes, since in
 785          * all other modes we've already removed all stations when
 786          * disconnecting etc.
 787          */
 788         sta_info_flush(local, sdata);
 789
 790         /*
 791          * Don't count this interface for promisc/allmulti while it
 792          * is down. dev_mc_unsync() will invoke set_multicast_list
 793          * on the master interface which will sync these down to the
 794          * hardware as filter flags.
 795          */
 796         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 797                 atomic_dec(&local->iff_allmultis);
 798
 799         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 800                 atomic_dec(&local->iff_promiscs);
 801
 802         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 803                 local->fif_pspoll--;
 804                 local->fif_probe_req--;
 805         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 806                 local->fif_probe_req--;
 807         }
 808
 809         if (sdata->dev) {
 810                 netif_addr_lock_bh(sdata->dev);
 811                 spin_lock_bh(&local->filter_lock);
 812                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 813                                  sdata->dev->addr_len);
 814                 spin_unlock_bh(&local->filter_lock);
 815                 netif_addr_unlock_bh(sdata->dev);
 816
 817                 ieee80211_configure_filter(local);
 818         }
 819
 820         del_timer_sync(&local->dynamic_ps_timer);
 821         cancel_work_sync(&local->dynamic_ps_enable_work);
 822
 823         cancel_work_sync(&sdata->recalc_smps);
 824
 825         /* APs need special treatment */
 826         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 827                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 828
 829                 /* down all dependent devices, that is VLANs */
 830                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 831                                          u.vlan.list)
 832                         dev_close(vlan->dev);
 833                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 834         } else if (sdata->vif.type == NL80211_IFTYPE_STATION) {
 835                 ieee80211_mgd_stop(sdata);
 836         }
 837
 838         if (going_down)
 839                 local->open_count--;
 840
 841         switch (sdata->vif.type) {
 842         case NL80211_IFTYPE_AP_VLAN:
 843                 list_del(&sdata->u.vlan.list);
 844                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
 845                 /* no need to tell driver */
 846                 break;
 847         case NL80211_IFTYPE_MONITOR:
 848                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 849                         local->cooked_mntrs--;
 850                         break;
 851                 }
 852
 853                 local->monitors--;
 854                 if (local->monitors == 0) {
 855                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 856                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 857                         ieee80211_del_virtual_monitor(local);
 858                 }
 859
 860                 ieee80211_adjust_monitor_flags(sdata, -1);
 861                 ieee80211_configure_filter(local);
 862                 break;
 863         case NL80211_IFTYPE_P2P_DEVICE:
 864                 /* relies on synchronize_rcu() below */
 865                 rcu_assign_pointer(local->p2p_sdata, NULL);
 866                 /* fall through */
 867         default:
 868                 cancel_work_sync(&sdata->work);
 869                 /*
 870                  * When we get here, the interface is marked down.
 871                  * Call synchronize_rcu() to wait for the RX path
 872                  * should it be using the interface and enqueuing
 873                  * frames at this very time on another CPU.
 874                  */
 875                 synchronize_rcu();
 876                 skb_queue_purge(&sdata->skb_queue);
 877
 878                 /*
 879                  * Free all remaining keys, there shouldn't be any,
 880                  * except maybe group keys in AP more or WDS?
 881                  */
 882                 ieee80211_free_keys(sdata);
 883
 884                 if (going_down)
 885                         drv_remove_interface(local, sdata);
 886         }
 887
 888         sdata->bss = NULL;
 889
 890         mutex_lock(&local->mtx);
 891         hw_reconf_flags |= __ieee80211_recalc_idle(local);
 892         mutex_unlock(&local->mtx);
 893
 894         ieee80211_recalc_ps(local, -1);
 895
 896         if (local->open_count == 0) {
 897                 if (local->ops->napi_poll)
 898                         napi_disable(&local->napi);
 899                 ieee80211_clear_tx_pending(local);
 900                 ieee80211_stop_device(local);
 901
 902                 /* no reconfiguring after stop! */
 903                 hw_reconf_flags = 0;
 904         }
 905
 906         /* do after stop to avoid reconfiguring when we stop anyway */
 907         if (hw_reconf_flags)
 908                 ieee80211_hw_config(local, hw_reconf_flags);
 909
 910         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 911         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 912                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 913                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 914                         if (info->control.vif == &sdata->vif) {
 915                                 __skb_unlink(skb, &local->pending[i]);
 916                                 ieee80211_free_txskb(&local->hw, skb);
 917                         }
 918                 }
 919         }
 920         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 921
 922         if (local->monitors == local->open_count && local->monitors > 0)
 923                 ieee80211_add_virtual_monitor(local);
 924 }
 925
 926 static int ieee80211_stop(struct net_device *dev)
 927 {
 928         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 929
 930         ieee80211_do_stop(sdata, true);
 931
 932         return 0;
 933 }
 934
 935 static void ieee80211_set_multicast_list(struct net_device *dev)
 936 {
 937         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 938         struct ieee80211_local *local = sdata->local;
 939         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 940
 941         allmulti = !!(dev->flags & IFF_ALLMULTI);
 942         promisc = !!(dev->flags & IFF_PROMISC);
 943         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 944         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 945
 946         if (allmulti != sdata_allmulti) {
 947                 if (dev->flags & IFF_ALLMULTI)
 948                         atomic_inc(&local->iff_allmultis);
 949                 else
 950                         atomic_dec(&local->iff_allmultis);
 951                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 952         }
 953
 954         if (promisc != sdata_promisc) {
 955                 if (dev->flags & IFF_PROMISC)
 956                         atomic_inc(&local->iff_promiscs);
 957                 else
 958                         atomic_dec(&local->iff_promiscs);
 959                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 960         }
 961         spin_lock_bh(&local->filter_lock);
 962         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 963         spin_unlock_bh(&local->filter_lock);
 964         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 965 }
 966
 967 /*
 968  * Called when the netdev is removed or, by the code below, before
 969  * the interface type changes.
 970  */
 971 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 972 {
 973         struct ieee80211_local *local = sdata->local;
 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(local, 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                 break;
1231         case NL80211_IFTYPE_P2P_CLIENT:
1232                 type = NL80211_IFTYPE_STATION;
1233                 sdata->vif.type = type;
1234                 sdata->vif.p2p = true;
1235                 /* fall through */
1236         case NL80211_IFTYPE_STATION:
1237                 ieee80211_sta_setup_sdata(sdata);
1238                 break;
1239         case NL80211_IFTYPE_ADHOC:
1240                 ieee80211_ibss_setup_sdata(sdata);
1241                 break;
1242         case NL80211_IFTYPE_MESH_POINT:
1243                 if (ieee80211_vif_is_mesh(&sdata->vif))
1244                         ieee80211_mesh_init_sdata(sdata);
1245                 break;
1246         case NL80211_IFTYPE_MONITOR:
1247                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1248                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1249                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1250                                       MONITOR_FLAG_OTHER_BSS;
1251                 break;
1252         case NL80211_IFTYPE_WDS:
1253         case NL80211_IFTYPE_AP_VLAN:
1254         case NL80211_IFTYPE_P2P_DEVICE:
1255                 break;
1256         case NL80211_IFTYPE_UNSPECIFIED:
1257         case NUM_NL80211_IFTYPES:
1258                 BUG();
1259                 break;
1260         }
1261
1262         ieee80211_debugfs_add_netdev(sdata);
1263 }
1264
1265 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1266                                            enum nl80211_iftype type)
1267 {
1268         struct ieee80211_local *local = sdata->local;
1269         int ret, err;
1270         enum nl80211_iftype internal_type = type;
1271         bool p2p = false;
1272
1273         ASSERT_RTNL();
1274
1275         if (!local->ops->change_interface)
1276                 return -EBUSY;
1277
1278         switch (sdata->vif.type) {
1279         case NL80211_IFTYPE_AP:
1280         case NL80211_IFTYPE_STATION:
1281         case NL80211_IFTYPE_ADHOC:
1282                 /*
1283                  * Could maybe also all others here?
1284                  * Just not sure how that interacts
1285                  * with the RX/config path e.g. for
1286                  * mesh.
1287                  */
1288                 break;
1289         default:
1290                 return -EBUSY;
1291         }
1292
1293         switch (type) {
1294         case NL80211_IFTYPE_AP:
1295         case NL80211_IFTYPE_STATION:
1296         case NL80211_IFTYPE_ADHOC:
1297                 /*
1298                  * Could probably support everything
1299                  * but WDS here (WDS do_open can fail
1300                  * under memory pressure, which this
1301                  * code isn't prepared to handle).
1302                  */
1303                 break;
1304         case NL80211_IFTYPE_P2P_CLIENT:
1305                 p2p = true;
1306                 internal_type = NL80211_IFTYPE_STATION;
1307                 break;
1308         case NL80211_IFTYPE_P2P_GO:
1309                 p2p = true;
1310                 internal_type = NL80211_IFTYPE_AP;
1311                 break;
1312         default:
1313                 return -EBUSY;
1314         }
1315
1316         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1317         if (ret)
1318                 return ret;
1319
1320         ieee80211_do_stop(sdata, false);
1321
1322         ieee80211_teardown_sdata(sdata);
1323
1324         ret = drv_change_interface(local, sdata, internal_type, p2p);
1325         if (ret)
1326                 type = sdata->vif.type;
1327
1328         /*
1329          * Ignore return value here, there's not much we can do since
1330          * the driver changed the interface type internally already.
1331          * The warnings will hopefully make driver authors fix it :-)
1332          */
1333         ieee80211_check_queues(sdata);
1334
1335         ieee80211_setup_sdata(sdata, type);
1336
1337         err = ieee80211_do_open(&sdata->wdev, false);
1338         WARN(err, "type change: do_open returned %d", err);
1339
1340         return ret;
1341 }
1342
1343 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1344                              enum nl80211_iftype type)
1345 {
1346         int ret;
1347
1348         ASSERT_RTNL();
1349
1350         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1351                 return 0;
1352
1353         if (ieee80211_sdata_running(sdata)) {
1354                 ret = ieee80211_runtime_change_iftype(sdata, type);
1355                 if (ret)
1356                         return ret;
1357         } else {
1358                 /* Purge and reset type-dependent state. */
1359                 ieee80211_teardown_sdata(sdata);
1360                 ieee80211_setup_sdata(sdata, type);
1361         }
1362
1363         /* reset some values that shouldn't be kept across type changes */
1364         sdata->drop_unencrypted = 0;
1365         if (type == NL80211_IFTYPE_STATION)
1366                 sdata->u.mgd.use_4addr = false;
1367
1368         return 0;
1369 }
1370
1371 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1372                                        u8 *perm_addr, enum nl80211_iftype type)
1373 {
1374         struct ieee80211_sub_if_data *sdata;
1375         u64 mask, start, addr, val, inc;
1376         u8 *m;
1377         u8 tmp_addr[ETH_ALEN];
1378         int i;
1379
1380         /* default ... something at least */
1381         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1382
1383         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1384             local->hw.wiphy->n_addresses <= 1)
1385                 return;
1386
1387         mutex_lock(&local->iflist_mtx);
1388
1389         switch (type) {
1390         case NL80211_IFTYPE_MONITOR:
1391                 /* doesn't matter */
1392                 break;
1393         case NL80211_IFTYPE_WDS:
1394         case NL80211_IFTYPE_AP_VLAN:
1395                 /* match up with an AP interface */
1396                 list_for_each_entry(sdata, &local->interfaces, list) {
1397                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1398                                 continue;
1399                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1400                         break;
1401                 }
1402                 /* keep default if no AP interface present */
1403                 break;
1404         case NL80211_IFTYPE_P2P_CLIENT:
1405         case NL80211_IFTYPE_P2P_GO:
1406                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1407                         list_for_each_entry(sdata, &local->interfaces, list) {
1408                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1409                                         continue;
1410                                 if (!ieee80211_sdata_running(sdata))
1411                                         continue;
1412                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1413                                 goto out_unlock;
1414                         }
1415                 }
1416                 /* otherwise fall through */
1417         default:
1418                 /* assign a new address if possible -- try n_addresses first */
1419                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1420                         bool used = false;
1421
1422                         list_for_each_entry(sdata, &local->interfaces, list) {
1423                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1424                                            sdata->vif.addr, ETH_ALEN) == 0) {
1425                                         used = true;
1426                                         break;
1427                                 }
1428                         }
1429
1430                         if (!used) {
1431                                 memcpy(perm_addr,
1432                                        local->hw.wiphy->addresses[i].addr,
1433                                        ETH_ALEN);
1434                                 break;
1435                         }
1436                 }
1437
1438                 /* try mask if available */
1439                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1440                         break;
1441
1442                 m = local->hw.wiphy->addr_mask;
1443                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1444                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1445                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1446
1447                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1448                         /* not a contiguous mask ... not handled now! */
1449                         pr_info("not contiguous\n");
1450                         break;
1451                 }
1452
1453                 m = local->hw.wiphy->perm_addr;
1454                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1455                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1456                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1457
1458                 inc = 1ULL<<__ffs64(mask);
1459                 val = (start & mask);
1460                 addr = (start & ~mask) | (val & mask);
1461                 do {
1462                         bool used = false;
1463
1464                         tmp_addr[5] = addr >> 0*8;
1465                         tmp_addr[4] = addr >> 1*8;
1466                         tmp_addr[3] = addr >> 2*8;
1467                         tmp_addr[2] = addr >> 3*8;
1468                         tmp_addr[1] = addr >> 4*8;
1469                         tmp_addr[0] = addr >> 5*8;
1470
1471                         val += inc;
1472
1473                         list_for_each_entry(sdata, &local->interfaces, list) {
1474                                 if (memcmp(tmp_addr, sdata->vif.addr,
1475                                                         ETH_ALEN) == 0) {
1476                                         used = true;
1477                                         break;
1478                                 }
1479                         }
1480
1481                         if (!used) {
1482                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1483                                 break;
1484                         }
1485                         addr = (start & ~mask) | (val & mask);
1486                 } while (addr != start);
1487
1488                 break;
1489         }
1490
1491  out_unlock:
1492         mutex_unlock(&local->iflist_mtx);
1493 }
1494
1495 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1496 {
1497         struct ieee80211_sub_if_data *sdata;
1498
1499         sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1500
1501         ieee80211_cleanup_sdata_stas(sdata);
1502 }
1503
1504 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1505                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1506                      struct vif_params *params)
1507 {
1508         struct net_device *ndev = NULL;
1509         struct ieee80211_sub_if_data *sdata = NULL;
1510         int ret, i;
1511         int txqs = 1;
1512
1513         ASSERT_RTNL();
1514
1515         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1516                 struct wireless_dev *wdev;
1517
1518                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1519                                 GFP_KERNEL);
1520                 if (!sdata)
1521                         return -ENOMEM;
1522                 wdev = &sdata->wdev;
1523
1524                 sdata->dev = NULL;
1525                 strlcpy(sdata->name, name, IFNAMSIZ);
1526                 ieee80211_assign_perm_addr(local, wdev->address, type);
1527                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1528         } else {
1529                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1530                         txqs = IEEE80211_NUM_ACS;
1531
1532                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1533                                         local->hw.vif_data_size,
1534                                         name, ieee80211_if_setup, txqs, 1);
1535                 if (!ndev)
1536                         return -ENOMEM;
1537                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1538
1539                 ndev->needed_headroom = local->tx_headroom +
1540                                         4*6 /* four MAC addresses */
1541                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1542                                         + 6 /* mesh */
1543                                         + 8 /* rfc1042/bridge tunnel */
1544                                         - ETH_HLEN /* ethernet hard_header_len */
1545                                         + IEEE80211_ENCRYPT_HEADROOM;
1546                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1547
1548                 ret = dev_alloc_name(ndev, ndev->name);
1549                 if (ret < 0) {
1550                         free_netdev(ndev);
1551                         return ret;
1552                 }
1553
1554                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1555                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1556                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1557
1558                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1559                 sdata = netdev_priv(ndev);
1560                 ndev->ieee80211_ptr = &sdata->wdev;
1561                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1562                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1563
1564                 sdata->dev = ndev;
1565         }
1566
1567         /* initialise type-independent data */
1568         sdata->wdev.wiphy = local->hw.wiphy;
1569         sdata->local = local;
1570 #ifdef CONFIG_INET
1571         sdata->arp_filter_state = true;
1572 #endif
1573
1574         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1575                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1576
1577         INIT_LIST_HEAD(&sdata->key_list);
1578
1579         spin_lock_init(&sdata->cleanup_stations_lock);
1580         INIT_LIST_HEAD(&sdata->cleanup_stations);
1581         INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1582
1583         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1584                 struct ieee80211_supported_band *sband;
1585                 sband = local->hw.wiphy->bands[i];
1586                 sdata->rc_rateidx_mask[i] =
1587                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1588                 if (sband)
1589                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1590                                sband->ht_cap.mcs.rx_mask,
1591                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1592                 else
1593                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1594                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1595         }
1596
1597         ieee80211_set_default_queues(sdata);
1598
1599         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1600         sdata->user_power_level = local->user_power_level;
1601
1602         /* setup type-dependent data */
1603         ieee80211_setup_sdata(sdata, type);
1604
1605         if (ndev) {
1606                 if (params) {
1607                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1608                         if (type == NL80211_IFTYPE_STATION)
1609                                 sdata->u.mgd.use_4addr = params->use_4addr;
1610                 }
1611
1612                 ndev->features |= local->hw.netdev_features;
1613
1614                 ret = register_netdevice(ndev);
1615                 if (ret) {
1616                         free_netdev(ndev);
1617                         return ret;
1618                 }
1619         }
1620
1621         mutex_lock(&local->iflist_mtx);
1622         list_add_tail_rcu(&sdata->list, &local->interfaces);
1623         mutex_unlock(&local->iflist_mtx);
1624
1625         if (new_wdev)
1626                 *new_wdev = &sdata->wdev;
1627
1628         return 0;
1629 }
1630
1631 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1632 {
1633         ASSERT_RTNL();
1634
1635         mutex_lock(&sdata->local->iflist_mtx);
1636         list_del_rcu(&sdata->list);
1637         mutex_unlock(&sdata->local->iflist_mtx);
1638
1639         synchronize_rcu();
1640
1641         if (sdata->dev) {
1642                 unregister_netdevice(sdata->dev);
1643         } else {
1644                 cfg80211_unregister_wdev(&sdata->wdev);
1645                 kfree(sdata);
1646         }
1647 }
1648
1649 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1650 {
1651         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1652                 return;
1653         ieee80211_do_stop(sdata, true);
1654         ieee80211_teardown_sdata(sdata);
1655 }
1656
1657 /*
1658  * Remove all interfaces, may only be called at hardware unregistration
1659  * time because it doesn't do RCU-safe list removals.
1660  */
1661 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1662 {
1663         struct ieee80211_sub_if_data *sdata, *tmp;
1664         LIST_HEAD(unreg_list);
1665         LIST_HEAD(wdev_list);
1666
1667         ASSERT_RTNL();
1668
1669         mutex_lock(&local->iflist_mtx);
1670         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1671                 list_del(&sdata->list);
1672
1673                 if (sdata->dev)
1674                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1675                 else
1676                         list_add(&sdata->list, &wdev_list);
1677         }
1678         mutex_unlock(&local->iflist_mtx);
1679         unregister_netdevice_many(&unreg_list);
1680         list_del(&unreg_list);
1681
1682         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1683                 list_del(&sdata->list);
1684                 cfg80211_unregister_wdev(&sdata->wdev);
1685                 kfree(sdata);
1686         }
1687 }
1688
1689 static int netdev_notify(struct notifier_block *nb,
1690                          unsigned long state,
1691                          void *ndev)
1692 {
1693         struct net_device *dev = ndev;
1694         struct ieee80211_sub_if_data *sdata;
1695
1696         if (state != NETDEV_CHANGENAME)
1697                 return 0;
1698
1699         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1700                 return 0;
1701
1702         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1703                 return 0;
1704
1705         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1706
1707         memcpy(sdata->name, dev->name, IFNAMSIZ);
1708
1709         ieee80211_debugfs_rename_netdev(sdata);
1710         return 0;
1711 }
1712
1713 static struct notifier_block mac80211_netdev_notifier = {
1714         .notifier_call = netdev_notify,
1715 };
1716
1717 int ieee80211_iface_init(void)
1718 {
1719         return register_netdevice_notifier(&mac80211_netdev_notifier);
1720 }
1721
1722 void ieee80211_iface_exit(void)
1723 {
1724         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1725 }