net/mac80211/iface.c

   1 /*
   2  * Interface handling
   3  *
   4  * Copyright 2002-2005, Instant802 Networks, Inc.
   5  * Copyright 2005-2006, Devicescape Software, Inc.
   6  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   7  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   8  *
   9  * This program is free software; you can redistribute it and/or modify
  10  * it under the terms of the GNU General Public License version 2 as
  11  * published by the Free Software Foundation.
  12  */
  13 #include <linux/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/if_arp.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/rtnetlink.h>
  18 #include <net/mac80211.h>
  19 #include <net/ieee80211_radiotap.h>
  20 #include "ieee80211_i.h"
  21 #include "sta_info.h"
  22 #include "debugfs_netdev.h"
  23 #include "mesh.h"
  24 #include "led.h"
  25 #include "driver-ops.h"
  26 #include "wme.h"
  27 #include "rate.h"
  28
  29 /**
  30  * DOC: Interface list locking
  31  *
  32  * The interface list in each struct ieee80211_local is protected
  33  * three-fold:
  34  *
  35  * (1) modifications may only be done under the RTNL
  36  * (2) modifications and readers are protected against each other by
  37  *     the iflist_mtx.
  38  * (3) modifications are done in an RCU manner so atomic readers
  39  *     can traverse the list in RCU-safe blocks.
  40  *
  41  * As a consequence, reads (traversals) of the list can be protected
  42  * by either the RTNL, the iflist_mtx or RCU.
  43  */
  44
  45 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  46 {
  47         struct ieee80211_chanctx_conf *chanctx_conf;
  48         int power;
  49
  50         rcu_read_lock();
  51         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  52         if (!chanctx_conf) {
  53                 rcu_read_unlock();
  54                 return false;
  55         }
  56
  57         power = chanctx_conf->def.chan->max_power;
  58         rcu_read_unlock();
  59
  60         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  61                 power = min(power, sdata->user_power_level);
  62
  63         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  64                 power = min(power, sdata->ap_power_level);
  65
  66         if (power != sdata->vif.bss_conf.txpower) {
  67                 sdata->vif.bss_conf.txpower = power;
  68                 ieee80211_hw_config(sdata->local, 0);
  69                 return true;
  70         }
  71
  72         return false;
  73 }
  74
  75 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  76 {
  77         if (__ieee80211_recalc_txpower(sdata))
  78                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  79 }
  80
  81 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
  82 {
  83         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  84                 return 0;
  85
  86         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  87         return IEEE80211_CONF_CHANGE_IDLE;
  88 }
  89
  90 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  91 {
  92         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  93                 return 0;
  94
  95         ieee80211_flush_queues(local, NULL);
  96
  97         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
  98         return IEEE80211_CONF_CHANGE_IDLE;
  99 }
 100
 101 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
 102                                    bool force_active)
 103 {
 104         bool working = false, scanning, active;
 105         unsigned int led_trig_start = 0, led_trig_stop = 0;
 106         struct ieee80211_roc_work *roc;
 107
 108         lockdep_assert_held(&local->mtx);
 109
 110         active = force_active ||
 111                  !list_empty(&local->chanctx_list) ||
 112                  local->monitors;
 113
 114         if (!local->ops->remain_on_channel) {
 115                 list_for_each_entry(roc, &local->roc_list, list) {
 116                         working = true;
 117                         break;
 118                 }
 119         }
 120
 121         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 122                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 123
 124         if (working || scanning)
 125                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 126         else
 127                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 128
 129         if (active)
 130                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 131         else
 132                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 133
 134         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 135
 136         if (working || scanning || active)
 137                 return __ieee80211_idle_off(local);
 138         return __ieee80211_idle_on(local);
 139 }
 140
 141 u32 ieee80211_idle_off(struct ieee80211_local *local)
 142 {
 143         return __ieee80211_recalc_idle(local, true);
 144 }
 145
 146 void ieee80211_recalc_idle(struct ieee80211_local *local)
 147 {
 148         u32 change = __ieee80211_recalc_idle(local, false);
 149         if (change)
 150                 ieee80211_hw_config(local, change);
 151 }
 152
 153 static int ieee80211_change_mtu(struct net_device *dev, int new_mtu)
 154 {
 155         if (new_mtu < 256 || new_mtu > IEEE80211_MAX_DATA_LEN)
 156                 return -EINVAL;
 157
 158         dev->mtu = new_mtu;
 159         return 0;
 160 }
 161
 162 static int ieee80211_verify_mac(struct ieee80211_local *local, u8 *addr,
 163                                 bool check_dup)
 164 {
 165         struct ieee80211_sub_if_data *sdata;
 166         u64 new, mask, tmp;
 167         u8 *m;
 168         int ret = 0;
 169
 170         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 171                 return 0;
 172
 173         m = addr;
 174         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 175                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 176                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 177
 178         m = local->hw.wiphy->addr_mask;
 179         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 180                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 181                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 182
 183         if (!check_dup)
 184                 return ret;
 185
 186         mutex_lock(&local->iflist_mtx);
 187         list_for_each_entry(sdata, &local->interfaces, list) {
 188                 if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 189                     !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 190                         continue;
 191
 192                 m = sdata->vif.addr;
 193                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 194                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 195                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 196
 197                 if ((new & ~mask) != (tmp & ~mask)) {
 198                         ret = -EINVAL;
 199                         break;
 200                 }
 201         }
 202         mutex_unlock(&local->iflist_mtx);
 203
 204         return ret;
 205 }
 206
 207 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 208 {
 209         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 210         struct sockaddr *sa = addr;
 211         bool check_dup = true;
 212         int ret;
 213
 214         if (ieee80211_sdata_running(sdata))
 215                 return -EBUSY;
 216
 217         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 218             !(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 219                 check_dup = false;
 220
 221         ret = ieee80211_verify_mac(sdata->local, sa->sa_data, check_dup);
 222         if (ret)
 223                 return ret;
 224
 225         ret = eth_mac_addr(dev, sa);
 226
 227         if (ret == 0)
 228                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 229
 230         return ret;
 231 }
 232
 233 static inline int identical_mac_addr_allowed(int type1, int type2)
 234 {
 235         return type1 == NL80211_IFTYPE_MONITOR ||
 236                 type2 == NL80211_IFTYPE_MONITOR ||
 237                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 238                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 239                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 240                 (type1 == NL80211_IFTYPE_WDS &&
 241                         (type2 == NL80211_IFTYPE_WDS ||
 242                          type2 == NL80211_IFTYPE_AP)) ||
 243                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 244                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 245                         (type2 == NL80211_IFTYPE_AP ||
 246                          type2 == NL80211_IFTYPE_AP_VLAN));
 247 }
 248
 249 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 250                                             enum nl80211_iftype iftype)
 251 {
 252         struct ieee80211_local *local = sdata->local;
 253         struct ieee80211_sub_if_data *nsdata;
 254
 255         ASSERT_RTNL();
 256
 257         /* we hold the RTNL here so can safely walk the list */
 258         list_for_each_entry(nsdata, &local->interfaces, list) {
 259                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 260                         /*
 261                          * Allow only a single IBSS interface to be up at any
 262                          * time. This is restricted because beacon distribution
 263                          * cannot work properly if both are in the same IBSS.
 264                          *
 265                          * To remove this restriction we'd have to disallow them
 266                          * from setting the same SSID on different IBSS interfaces
 267                          * belonging to the same hardware. Then, however, we're
 268                          * faced with having to adopt two different TSF timers...
 269                          */
 270                         if (iftype == NL80211_IFTYPE_ADHOC &&
 271                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 272                                 return -EBUSY;
 273
 274                         /*
 275                          * The remaining checks are only performed for interfaces
 276                          * with the same MAC address.
 277                          */
 278                         if (!ether_addr_equal(sdata->vif.addr,
 279                                               nsdata->vif.addr))
 280                                 continue;
 281
 282                         /*
 283                          * check whether it may have the same address
 284                          */
 285                         if (!identical_mac_addr_allowed(iftype,
 286                                                         nsdata->vif.type))
 287                                 return -ENOTUNIQ;
 288
 289                         /*
 290                          * can only add VLANs to enabled APs
 291                          */
 292                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 293                             nsdata->vif.type == NL80211_IFTYPE_AP)
 294                                 sdata->bss = &nsdata->u.ap;
 295                 }
 296         }
 297
 298         return 0;
 299 }
 300
 301 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata)
 302 {
 303         int n_queues = sdata->local->hw.queues;
 304         int i;
 305
 306         if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE) {
 307                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 308                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 309                                          IEEE80211_INVAL_HW_QUEUE))
 310                                 return -EINVAL;
 311                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 312                                          n_queues))
 313                                 return -EINVAL;
 314                 }
 315         }
 316
 317         if ((sdata->vif.type != NL80211_IFTYPE_AP &&
 318              sdata->vif.type != NL80211_IFTYPE_MESH_POINT) ||
 319             !(sdata->local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)) {
 320                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 321                 return 0;
 322         }
 323
 324         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 325                 return -EINVAL;
 326
 327         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 328                 return -EINVAL;
 329
 330         return 0;
 331 }
 332
 333 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 334                                     const int offset)
 335 {
 336         struct ieee80211_local *local = sdata->local;
 337         u32 flags = sdata->u.mntr_flags;
 338
 339 #define ADJUST(_f, _s)  do {                                    \
 340         if (flags & MONITOR_FLAG_##_f)                          \
 341                 local->fif_##_s += offset;                      \
 342         } while (0)
 343
 344         ADJUST(FCSFAIL, fcsfail);
 345         ADJUST(PLCPFAIL, plcpfail);
 346         ADJUST(CONTROL, control);
 347         ADJUST(CONTROL, pspoll);
 348         ADJUST(OTHER_BSS, other_bss);
 349
 350 #undef ADJUST
 351 }
 352
 353 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 354 {
 355         struct ieee80211_local *local = sdata->local;
 356         int i;
 357
 358         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 359                 if (local->hw.flags & IEEE80211_HW_QUEUE_CONTROL)
 360                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 361                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 362                         sdata->vif.hw_queue[i] = i;
 363                 else
 364                         sdata->vif.hw_queue[i] = 0;
 365         }
 366         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 367 }
 368
 369 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 370 {
 371         struct ieee80211_sub_if_data *sdata;
 372         int ret;
 373
 374         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 375                 return 0;
 376
 377         ASSERT_RTNL();
 378
 379         if (local->monitor_sdata)
 380                 return 0;
 381
 382         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 383         if (!sdata)
 384                 return -ENOMEM;
 385
 386         /* set up data */
 387         sdata->local = local;
 388         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 389         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 390                  wiphy_name(local->hw.wiphy));
 391
 392         ieee80211_set_default_queues(sdata);
 393
 394         ret = drv_add_interface(local, sdata);
 395         if (WARN_ON(ret)) {
 396                 /* ok .. stupid driver, it asked for this! */
 397                 kfree(sdata);
 398                 return ret;
 399         }
 400
 401         ret = ieee80211_check_queues(sdata);
 402         if (ret) {
 403                 kfree(sdata);
 404                 return ret;
 405         }
 406
 407         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 408                                         IEEE80211_CHANCTX_EXCLUSIVE);
 409         if (ret) {
 410                 drv_remove_interface(local, sdata);
 411                 kfree(sdata);
 412                 return ret;
 413         }
 414
 415         mutex_lock(&local->iflist_mtx);
 416         rcu_assign_pointer(local->monitor_sdata, sdata);
 417         mutex_unlock(&local->iflist_mtx);
 418
 419         return 0;
 420 }
 421
 422 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 423 {
 424         struct ieee80211_sub_if_data *sdata;
 425
 426         if (!(local->hw.flags & IEEE80211_HW_WANT_MONITOR_VIF))
 427                 return;
 428
 429         ASSERT_RTNL();
 430
 431         mutex_lock(&local->iflist_mtx);
 432
 433         sdata = rcu_dereference_protected(local->monitor_sdata,
 434                                           lockdep_is_held(&local->iflist_mtx));
 435         if (!sdata) {
 436                 mutex_unlock(&local->iflist_mtx);
 437                 return;
 438         }
 439
 440         rcu_assign_pointer(local->monitor_sdata, NULL);
 441         mutex_unlock(&local->iflist_mtx);
 442
 443         synchronize_net();
 444
 445         ieee80211_vif_release_channel(sdata);
 446
 447         drv_remove_interface(local, sdata);
 448
 449         kfree(sdata);
 450 }
 451
 452 /*
 453  * NOTE: Be very careful when changing this function, it must NOT return
 454  * an error on interface type changes that have been pre-checked, so most
 455  * checks should be in ieee80211_check_concurrent_iface.
 456  */
 457 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 458 {
 459         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 460         struct net_device *dev = wdev->netdev;
 461         struct ieee80211_local *local = sdata->local;
 462         struct sta_info *sta;
 463         u32 changed = 0;
 464         int res;
 465         u32 hw_reconf_flags = 0;
 466
 467         switch (sdata->vif.type) {
 468         case NL80211_IFTYPE_WDS:
 469                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 470                         return -ENOLINK;
 471                 break;
 472         case NL80211_IFTYPE_AP_VLAN: {
 473                 struct ieee80211_sub_if_data *master;
 474
 475                 if (!sdata->bss)
 476                         return -ENOLINK;
 477
 478                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 479
 480                 master = container_of(sdata->bss,
 481                                       struct ieee80211_sub_if_data, u.ap);
 482                 sdata->control_port_protocol =
 483                         master->control_port_protocol;
 484                 sdata->control_port_no_encrypt =
 485                         master->control_port_no_encrypt;
 486                 sdata->vif.cab_queue = master->vif.cab_queue;
 487                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
 488                        sizeof(sdata->vif.hw_queue));
 489                 break;
 490                 }
 491         case NL80211_IFTYPE_AP:
 492                 sdata->bss = &sdata->u.ap;
 493                 break;
 494         case NL80211_IFTYPE_MESH_POINT:
 495         case NL80211_IFTYPE_STATION:
 496         case NL80211_IFTYPE_MONITOR:
 497         case NL80211_IFTYPE_ADHOC:
 498         case NL80211_IFTYPE_P2P_DEVICE:
 499                 /* no special treatment */
 500                 break;
 501         case NL80211_IFTYPE_UNSPECIFIED:
 502         case NUM_NL80211_IFTYPES:
 503         case NL80211_IFTYPE_P2P_CLIENT:
 504         case NL80211_IFTYPE_P2P_GO:
 505                 /* cannot happen */
 506                 WARN_ON(1);
 507                 break;
 508         }
 509
 510         if (local->open_count == 0) {
 511                 res = drv_start(local);
 512                 if (res)
 513                         goto err_del_bss;
 514                 /* we're brought up, everything changes */
 515                 hw_reconf_flags = ~0;
 516                 ieee80211_led_radio(local, true);
 517                 ieee80211_mod_tpt_led_trig(local,
 518                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 519         }
 520
 521         /*
 522          * Copy the hopefully now-present MAC address to
 523          * this interface, if it has the special null one.
 524          */
 525         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 526                 memcpy(dev->dev_addr,
 527                        local->hw.wiphy->perm_addr,
 528                        ETH_ALEN);
 529                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 530
 531                 if (!is_valid_ether_addr(dev->dev_addr)) {
 532                         res = -EADDRNOTAVAIL;
 533                         goto err_stop;
 534                 }
 535         }
 536
 537         switch (sdata->vif.type) {
 538         case NL80211_IFTYPE_AP_VLAN:
 539                 /* no need to tell driver, but set carrier and chanctx */
 540                 if (rtnl_dereference(sdata->bss->beacon)) {
 541                         ieee80211_vif_vlan_copy_chanctx(sdata);
 542                         netif_carrier_on(dev);
 543                 } else {
 544                         netif_carrier_off(dev);
 545                 }
 546                 break;
 547         case NL80211_IFTYPE_MONITOR:
 548                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 549                         local->cooked_mntrs++;
 550                         break;
 551                 }
 552
 553                 if (sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE) {
 554                         res = drv_add_interface(local, sdata);
 555                         if (res)
 556                                 goto err_stop;
 557                 } else if (local->monitors == 0 && local->open_count == 0) {
 558                         res = ieee80211_add_virtual_monitor(local);
 559                         if (res)
 560                                 goto err_stop;
 561                 }
 562
 563                 /* must be before the call to ieee80211_configure_filter */
 564                 local->monitors++;
 565                 if (local->monitors == 1) {
 566                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 567                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 568                 }
 569
 570                 ieee80211_adjust_monitor_flags(sdata, 1);
 571                 ieee80211_configure_filter(local);
 572                 mutex_lock(&local->mtx);
 573                 ieee80211_recalc_idle(local);
 574                 mutex_unlock(&local->mtx);
 575
 576                 netif_carrier_on(dev);
 577                 break;
 578         default:
 579                 if (coming_up) {
 580                         ieee80211_del_virtual_monitor(local);
 581
 582                         res = drv_add_interface(local, sdata);
 583                         if (res)
 584                                 goto err_stop;
 585                         res = ieee80211_check_queues(sdata);
 586                         if (res)
 587                                 goto err_del_interface;
 588                 }
 589
 590                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 591                         local->fif_pspoll++;
 592                         local->fif_probe_req++;
 593
 594                         ieee80211_configure_filter(local);
 595                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 596                         local->fif_probe_req++;
 597                 }
 598
 599                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
 600                         changed |= ieee80211_reset_erp_info(sdata);
 601                 ieee80211_bss_info_change_notify(sdata, changed);
 602
 603                 switch (sdata->vif.type) {
 604                 case NL80211_IFTYPE_STATION:
 605                 case NL80211_IFTYPE_ADHOC:
 606                 case NL80211_IFTYPE_AP:
 607                 case NL80211_IFTYPE_MESH_POINT:
 608                         netif_carrier_off(dev);
 609                         break;
 610                 case NL80211_IFTYPE_WDS:
 611                 case NL80211_IFTYPE_P2P_DEVICE:
 612                         break;
 613                 default:
 614                         /* not reached */
 615                         WARN_ON(1);
 616                 }
 617
 618                 /*
 619                  * set default queue parameters so drivers don't
 620                  * need to initialise the hardware if the hardware
 621                  * doesn't start up with sane defaults
 622                  */
 623                 ieee80211_set_wmm_default(sdata, true);
 624         }
 625
 626         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 627
 628         if (sdata->vif.type == NL80211_IFTYPE_WDS) {
 629                 /* Create STA entry for the WDS peer */
 630                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 631                                      GFP_KERNEL);
 632                 if (!sta) {
 633                         res = -ENOMEM;
 634                         goto err_del_interface;
 635                 }
 636
 637                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 638                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 639                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 640
 641                 res = sta_info_insert(sta);
 642                 if (res) {
 643                         /* STA has been freed */
 644                         goto err_del_interface;
 645                 }
 646
 647                 rate_control_rate_init(sta);
 648                 netif_carrier_on(dev);
 649         } else if (sdata->vif.type == NL80211_IFTYPE_P2P_DEVICE) {
 650                 rcu_assign_pointer(local->p2p_sdata, sdata);
 651         }
 652
 653         /*
 654          * set_multicast_list will be invoked by the networking core
 655          * which will check whether any increments here were done in
 656          * error and sync them down to the hardware as filter flags.
 657          */
 658         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 659                 atomic_inc(&local->iff_allmultis);
 660
 661         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 662                 atomic_inc(&local->iff_promiscs);
 663
 664         if (coming_up)
 665                 local->open_count++;
 666
 667         if (hw_reconf_flags)
 668                 ieee80211_hw_config(local, hw_reconf_flags);
 669
 670         ieee80211_recalc_ps(local, -1);
 671
 672         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 673             sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 674                 /* XXX: for AP_VLAN, actually track AP queues */
 675                 netif_tx_start_all_queues(dev);
 676         } else if (dev) {
 677                 unsigned long flags;
 678                 int n_acs = IEEE80211_NUM_ACS;
 679                 int ac;
 680
 681                 if (local->hw.queues < IEEE80211_NUM_ACS)
 682                         n_acs = 1;
 683
 684                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 685                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 686                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 687                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 688                         for (ac = 0; ac < n_acs; ac++) {
 689                                 int ac_queue = sdata->vif.hw_queue[ac];
 690
 691                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 692                                     skb_queue_empty(&local->pending[ac_queue]))
 693                                         netif_start_subqueue(dev, ac);
 694                         }
 695                 }
 696                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 697         }
 698
 699         return 0;
 700  err_del_interface:
 701         drv_remove_interface(local, sdata);
 702  err_stop:
 703         if (!local->open_count)
 704                 drv_stop(local);
 705  err_del_bss:
 706         sdata->bss = NULL;
 707         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 708                 list_del(&sdata->u.vlan.list);
 709         /* might already be clear but that doesn't matter */
 710         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 711         return res;
 712 }
 713
 714 static int ieee80211_open(struct net_device *dev)
 715 {
 716         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 717         int err;
 718
 719         /* fail early if user set an invalid address */
 720         if (!is_valid_ether_addr(dev->dev_addr))
 721                 return -EADDRNOTAVAIL;
 722
 723         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 724         if (err)
 725                 return err;
 726
 727         return ieee80211_do_open(&sdata->wdev, true);
 728 }
 729
 730 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 731                               bool going_down)
 732 {
 733         struct ieee80211_local *local = sdata->local;
 734         unsigned long flags;
 735         struct sk_buff *skb, *tmp;
 736         u32 hw_reconf_flags = 0;
 737         int i, flushed;
 738         struct ps_data *ps;
 739
 740         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 741
 742         if (rcu_access_pointer(local->scan_sdata) == sdata)
 743                 ieee80211_scan_cancel(local);
 744
 745         /*
 746          * Stop TX on this interface first.
 747          */
 748         if (sdata->dev)
 749                 netif_tx_stop_all_queues(sdata->dev);
 750
 751         ieee80211_roc_purge(local, sdata);
 752
 753         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 754                 ieee80211_mgd_stop(sdata);
 755
 756         /*
 757          * Remove all stations associated with this interface.
 758          *
 759          * This must be done before calling ops->remove_interface()
 760          * because otherwise we can later invoke ops->sta_notify()
 761          * whenever the STAs are removed, and that invalidates driver
 762          * assumptions about always getting a vif pointer that is valid
 763          * (because if we remove a STA after ops->remove_interface()
 764          * the driver will have removed the vif info already!)
 765          *
 766          * This is relevant only in WDS mode, in all other modes we've
 767          * already removed all stations when disconnecting or similar,
 768          * so warn otherwise.
 769          *
 770          * We call sta_info_flush_cleanup() later, to combine RCU waits.
 771          */
 772         flushed = sta_info_flush_defer(sdata);
 773         WARN_ON_ONCE((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 774                      (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1));
 775
 776         /* don't count this interface for promisc/allmulti while it is down */
 777         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 778                 atomic_dec(&local->iff_allmultis);
 779
 780         if (sdata->flags & IEEE80211_SDATA_PROMISC)
 781                 atomic_dec(&local->iff_promiscs);
 782
 783         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 784                 local->fif_pspoll--;
 785                 local->fif_probe_req--;
 786         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 787                 local->fif_probe_req--;
 788         }
 789
 790         if (sdata->dev) {
 791                 netif_addr_lock_bh(sdata->dev);
 792                 spin_lock_bh(&local->filter_lock);
 793                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 794                                  sdata->dev->addr_len);
 795                 spin_unlock_bh(&local->filter_lock);
 796                 netif_addr_unlock_bh(sdata->dev);
 797         }
 798
 799         del_timer_sync(&local->dynamic_ps_timer);
 800         cancel_work_sync(&local->dynamic_ps_enable_work);
 801
 802         cancel_work_sync(&sdata->recalc_smps);
 803
 804         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 805
 806         if (sdata->wdev.cac_started) {
 807                 WARN_ON(local->suspended);
 808                 mutex_lock(&local->iflist_mtx);
 809                 ieee80211_vif_release_channel(sdata);
 810                 mutex_unlock(&local->iflist_mtx);
 811                 cfg80211_cac_event(sdata->dev, NL80211_RADAR_CAC_ABORTED,
 812                                    GFP_KERNEL);
 813         }
 814
 815         /* APs need special treatment */
 816         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 817                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 818
 819                 /* down all dependent devices, that is VLANs */
 820                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 821                                          u.vlan.list)
 822                         dev_close(vlan->dev);
 823                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 824         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 825                 /* remove all packets in parent bc_buf pointing to this dev */
 826                 ps = &sdata->bss->ps;
 827
 828                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 829                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 830                         if (skb->dev == sdata->dev) {
 831                                 __skb_unlink(skb, &ps->bc_buf);
 832                                 local->total_ps_buffered--;
 833                                 ieee80211_free_txskb(&local->hw, skb);
 834                         }
 835                 }
 836                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 837         }
 838
 839         if (going_down)
 840                 local->open_count--;
 841
 842         switch (sdata->vif.type) {
 843         case NL80211_IFTYPE_AP_VLAN:
 844                 list_del(&sdata->u.vlan.list);
 845                 rcu_assign_pointer(sdata->vif.chanctx_conf, NULL);
 846                 /* no need to tell driver */
 847                 break;
 848         case NL80211_IFTYPE_MONITOR:
 849                 if (sdata->u.mntr_flags & MONITOR_FLAG_COOK_FRAMES) {
 850                         local->cooked_mntrs--;
 851                         break;
 852                 }
 853
 854                 local->monitors--;
 855                 if (local->monitors == 0) {
 856                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 857                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 858                 }
 859
 860                 ieee80211_adjust_monitor_flags(sdata, -1);
 861                 break;
 862         case NL80211_IFTYPE_P2P_DEVICE:
 863                 /* relies on synchronize_rcu() below */
 864                 rcu_assign_pointer(local->p2p_sdata, NULL);
 865                 /* fall through */
 866         default:
 867                 cancel_work_sync(&sdata->work);
 868                 /*
 869                  * When we get here, the interface is marked down.
 870                  *
 871                  * sta_info_flush_cleanup() requires rcu_barrier()
 872                  * first to wait for the station call_rcu() calls
 873                  * to complete, and we also need synchronize_rcu()
 874                  * to wait for the RX path in case it is using the
 875                  * interface and enqueuing frames at this very time on
 876                  * another CPU.
 877                  */
 878                 synchronize_rcu();
 879                 rcu_barrier();
 880                 sta_info_flush_cleanup(sdata);
 881
 882                 /*
 883                  * Free all remaining keys, there shouldn't be any,
 884                  * except maybe in WDS mode?
 885                  */
 886                 ieee80211_free_keys(sdata);
 887
 888                 /* fall through */
 889         case NL80211_IFTYPE_AP:
 890                 skb_queue_purge(&sdata->skb_queue);
 891         }
 892
 893         sdata->bss = NULL;
 894
 895         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 896         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 897                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 898                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 899                         if (info->control.vif == &sdata->vif) {
 900                                 __skb_unlink(skb, &local->pending[i]);
 901                                 ieee80211_free_txskb(&local->hw, skb);
 902                         }
 903                 }
 904         }
 905         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 906
 907         if (local->open_count == 0)
 908                 ieee80211_clear_tx_pending(local);
 909
 910         /*
 911          * If the interface goes down while suspended, presumably because
 912          * the device was unplugged and that happens before our resume,
 913          * then the driver is already unconfigured and the remainder of
 914          * this function isn't needed.
 915          * XXX: what about WoWLAN? If the device has software state, e.g.
 916          *      memory allocated, it might expect teardown commands from
 917          *      mac80211 here?
 918          */
 919         if (local->suspended) {
 920                 WARN_ON(local->wowlan);
 921                 WARN_ON(rtnl_dereference(local->monitor_sdata));
 922                 return;
 923         }
 924
 925         switch (sdata->vif.type) {
 926         case NL80211_IFTYPE_AP_VLAN:
 927                 break;
 928         case NL80211_IFTYPE_MONITOR:
 929                 if (local->monitors == 0)
 930                         ieee80211_del_virtual_monitor(local);
 931
 932                 mutex_lock(&local->mtx);
 933                 ieee80211_recalc_idle(local);
 934                 mutex_unlock(&local->mtx);
 935
 936                 if (!(sdata->u.mntr_flags & MONITOR_FLAG_ACTIVE))
 937                         break;
 938
 939                 /* fall through */
 940         default:
 941                 if (going_down)
 942                         drv_remove_interface(local, sdata);
 943         }
 944
 945         ieee80211_recalc_ps(local, -1);
 946
 947         if (local->open_count == 0) {
 948                 ieee80211_stop_device(local);
 949
 950                 /* no reconfiguring after stop! */
 951                 return;
 952         }
 953
 954         /* do after stop to avoid reconfiguring when we stop anyway */
 955         ieee80211_configure_filter(local);
 956         ieee80211_hw_config(local, hw_reconf_flags);
 957
 958         if (local->monitors == local->open_count)
 959                 ieee80211_add_virtual_monitor(local);
 960 }
 961
 962 static int ieee80211_stop(struct net_device *dev)
 963 {
 964         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 965
 966         ieee80211_do_stop(sdata, true);
 967
 968         return 0;
 969 }
 970
 971 static void ieee80211_set_multicast_list(struct net_device *dev)
 972 {
 973         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 974         struct ieee80211_local *local = sdata->local;
 975         int allmulti, promisc, sdata_allmulti, sdata_promisc;
 976
 977         allmulti = !!(dev->flags & IFF_ALLMULTI);
 978         promisc = !!(dev->flags & IFF_PROMISC);
 979         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 980         sdata_promisc = !!(sdata->flags & IEEE80211_SDATA_PROMISC);
 981
 982         if (allmulti != sdata_allmulti) {
 983                 if (dev->flags & IFF_ALLMULTI)
 984                         atomic_inc(&local->iff_allmultis);
 985                 else
 986                         atomic_dec(&local->iff_allmultis);
 987                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 988         }
 989
 990         if (promisc != sdata_promisc) {
 991                 if (dev->flags & IFF_PROMISC)
 992                         atomic_inc(&local->iff_promiscs);
 993                 else
 994                         atomic_dec(&local->iff_promiscs);
 995                 sdata->flags ^= IEEE80211_SDATA_PROMISC;
 996         }
 997
 998         /*
 999          * TODO: If somebody needs this on AP interfaces,
1000          *       it can be enabled easily but multicast
1001          *       addresses from VLANs need to be synced.
1002          */
1003         if (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
1004             sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
1005             sdata->vif.type != NL80211_IFTYPE_AP)
1006                 drv_set_multicast_list(local, sdata, &dev->mc);
1007
1008         spin_lock_bh(&local->filter_lock);
1009         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1010         spin_unlock_bh(&local->filter_lock);
1011         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1012 }
1013
1014 /*
1015  * Called when the netdev is removed or, by the code below, before
1016  * the interface type changes.
1017  */
1018 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1019 {
1020         int flushed;
1021         int i;
1022
1023         /* free extra data */
1024         ieee80211_free_keys(sdata);
1025
1026         ieee80211_debugfs_remove_netdev(sdata);
1027
1028         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1029                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1030         sdata->fragment_next = 0;
1031
1032         if (ieee80211_vif_is_mesh(&sdata->vif))
1033                 mesh_rmc_free(sdata);
1034
1035         flushed = sta_info_flush(sdata);
1036         WARN_ON(flushed);
1037 }
1038
1039 static void ieee80211_uninit(struct net_device *dev)
1040 {
1041         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1042 }
1043
1044 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1045                                          struct sk_buff *skb)
1046 {
1047         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1048 }
1049
1050 static const struct net_device_ops ieee80211_dataif_ops = {
1051         .ndo_open               = ieee80211_open,
1052         .ndo_stop               = ieee80211_stop,
1053         .ndo_uninit             = ieee80211_uninit,
1054         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1055         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1056         .ndo_change_mtu         = ieee80211_change_mtu,
1057         .ndo_set_mac_address    = ieee80211_change_mac,
1058         .ndo_select_queue       = ieee80211_netdev_select_queue,
1059 };
1060
1061 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1062                                           struct sk_buff *skb)
1063 {
1064         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1065         struct ieee80211_local *local = sdata->local;
1066         struct ieee80211_hdr *hdr;
1067         struct ieee80211_radiotap_header *rtap = (void *)skb->data;
1068
1069         if (local->hw.queues < IEEE80211_NUM_ACS)
1070                 return 0;
1071
1072         if (skb->len < 4 ||
1073             skb->len < le16_to_cpu(rtap->it_len) + 2 /* frame control */)
1074                 return 0; /* doesn't matter, frame will be dropped */
1075
1076         hdr = (void *)((u8 *)skb->data + le16_to_cpu(rtap->it_len));
1077
1078         return ieee80211_select_queue_80211(sdata, skb, hdr);
1079 }
1080
1081 static const struct net_device_ops ieee80211_monitorif_ops = {
1082         .ndo_open               = ieee80211_open,
1083         .ndo_stop               = ieee80211_stop,
1084         .ndo_uninit             = ieee80211_uninit,
1085         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1086         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1087         .ndo_change_mtu         = ieee80211_change_mtu,
1088         .ndo_set_mac_address    = ieee80211_change_mac,
1089         .ndo_select_queue       = ieee80211_monitor_select_queue,
1090 };
1091
1092 static void ieee80211_if_setup(struct net_device *dev)
1093 {
1094         ether_setup(dev);
1095         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1096         dev->netdev_ops = &ieee80211_dataif_ops;
1097         dev->destructor = free_netdev;
1098 }
1099
1100 static void ieee80211_iface_work(struct work_struct *work)
1101 {
1102         struct ieee80211_sub_if_data *sdata =
1103                 container_of(work, struct ieee80211_sub_if_data, work);
1104         struct ieee80211_local *local = sdata->local;
1105         struct sk_buff *skb;
1106         struct sta_info *sta;
1107         struct ieee80211_ra_tid *ra_tid;
1108
1109         if (!ieee80211_sdata_running(sdata))
1110                 return;
1111
1112         if (local->scanning)
1113                 return;
1114
1115         /*
1116          * ieee80211_queue_work() should have picked up most cases,
1117          * here we'll pick the rest.
1118          */
1119         if (WARN(local->suspended,
1120                  "interface work scheduled while going to suspend\n"))
1121                 return;
1122
1123         /* first process frames */
1124         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1125                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1126
1127                 if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_START) {
1128                         ra_tid = (void *)&skb->cb;
1129                         ieee80211_start_tx_ba_cb(&sdata->vif, ra_tid->ra,
1130                                                  ra_tid->tid);
1131                 } else if (skb->pkt_type == IEEE80211_SDATA_QUEUE_AGG_STOP) {
1132                         ra_tid = (void *)&skb->cb;
1133                         ieee80211_stop_tx_ba_cb(&sdata->vif, ra_tid->ra,
1134                                                 ra_tid->tid);
1135                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1136                            mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1137                         int len = skb->len;
1138
1139                         mutex_lock(&local->sta_mtx);
1140                         sta = sta_info_get_bss(sdata, mgmt->sa);
1141                         if (sta) {
1142                                 switch (mgmt->u.action.u.addba_req.action_code) {
1143                                 case WLAN_ACTION_ADDBA_REQ:
1144                                         ieee80211_process_addba_request(
1145                                                         local, sta, mgmt, len);
1146                                         break;
1147                                 case WLAN_ACTION_ADDBA_RESP:
1148                                         ieee80211_process_addba_resp(local, sta,
1149                                                                      mgmt, len);
1150                                         break;
1151                                 case WLAN_ACTION_DELBA:
1152                                         ieee80211_process_delba(sdata, sta,
1153                                                                 mgmt, len);
1154                                         break;
1155                                 default:
1156                                         WARN_ON(1);
1157                                         break;
1158                                 }
1159                         }
1160                         mutex_unlock(&local->sta_mtx);
1161                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1162                         struct ieee80211_hdr *hdr = (void *)mgmt;
1163                         /*
1164                          * So the frame isn't mgmt, but frame_control
1165                          * is at the right place anyway, of course, so
1166                          * the if statement is correct.
1167                          *
1168                          * Warn if we have other data frame types here,
1169                          * they must not get here.
1170                          */
1171                         WARN_ON(hdr->frame_control &
1172                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1173                         WARN_ON(!(hdr->seq_ctrl &
1174                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1175                         /*
1176                          * This was a fragment of a frame, received while
1177                          * a block-ack session was active. That cannot be
1178                          * right, so terminate the session.
1179                          */
1180                         mutex_lock(&local->sta_mtx);
1181                         sta = sta_info_get_bss(sdata, mgmt->sa);
1182                         if (sta) {
1183                                 u16 tid = *ieee80211_get_qos_ctl(hdr) &
1184                                                 IEEE80211_QOS_CTL_TID_MASK;
1185
1186                                 __ieee80211_stop_rx_ba_session(
1187                                         sta, tid, WLAN_BACK_RECIPIENT,
1188                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1189                                         true);
1190                         }
1191                         mutex_unlock(&local->sta_mtx);
1192                 } else switch (sdata->vif.type) {
1193                 case NL80211_IFTYPE_STATION:
1194                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1195                         break;
1196                 case NL80211_IFTYPE_ADHOC:
1197                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1198                         break;
1199                 case NL80211_IFTYPE_MESH_POINT:
1200                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1201                                 break;
1202                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1203                         break;
1204                 default:
1205                         WARN(1, "frame for unexpected interface type");
1206                         break;
1207                 }
1208
1209                 kfree_skb(skb);
1210         }
1211
1212         /* then other type-dependent work */
1213         switch (sdata->vif.type) {
1214         case NL80211_IFTYPE_STATION:
1215                 ieee80211_sta_work(sdata);
1216                 break;
1217         case NL80211_IFTYPE_ADHOC:
1218                 ieee80211_ibss_work(sdata);
1219                 break;
1220         case NL80211_IFTYPE_MESH_POINT:
1221                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1222                         break;
1223                 ieee80211_mesh_work(sdata);
1224                 break;
1225         default:
1226                 break;
1227         }
1228 }
1229
1230 static void ieee80211_recalc_smps_work(struct work_struct *work)
1231 {
1232         struct ieee80211_sub_if_data *sdata =
1233                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1234
1235         ieee80211_recalc_smps(sdata);
1236 }
1237
1238 /*
1239  * Helper function to initialise an interface to a specific type.
1240  */
1241 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1242                                   enum nl80211_iftype type)
1243 {
1244         /* clear type-dependent union */
1245         memset(&sdata->u, 0, sizeof(sdata->u));
1246
1247         /* and set some type-dependent values */
1248         sdata->vif.type = type;
1249         sdata->vif.p2p = false;
1250         sdata->wdev.iftype = type;
1251
1252         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1253         sdata->control_port_no_encrypt = false;
1254
1255         sdata->noack_map = 0;
1256
1257         /* only monitor/p2p-device differ */
1258         if (sdata->dev) {
1259                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1260                 sdata->dev->type = ARPHRD_ETHER;
1261         }
1262
1263         skb_queue_head_init(&sdata->skb_queue);
1264         INIT_WORK(&sdata->work, ieee80211_iface_work);
1265         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1266
1267         switch (type) {
1268         case NL80211_IFTYPE_P2P_GO:
1269                 type = NL80211_IFTYPE_AP;
1270                 sdata->vif.type = type;
1271                 sdata->vif.p2p = true;
1272                 /* fall through */
1273         case NL80211_IFTYPE_AP:
1274                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1275                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1276                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1277                 break;
1278         case NL80211_IFTYPE_P2P_CLIENT:
1279                 type = NL80211_IFTYPE_STATION;
1280                 sdata->vif.type = type;
1281                 sdata->vif.p2p = true;
1282                 /* fall through */
1283         case NL80211_IFTYPE_STATION:
1284                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1285                 ieee80211_sta_setup_sdata(sdata);
1286                 break;
1287         case NL80211_IFTYPE_ADHOC:
1288                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1289                 ieee80211_ibss_setup_sdata(sdata);
1290                 break;
1291         case NL80211_IFTYPE_MESH_POINT:
1292                 if (ieee80211_vif_is_mesh(&sdata->vif))
1293                         ieee80211_mesh_init_sdata(sdata);
1294                 break;
1295         case NL80211_IFTYPE_MONITOR:
1296                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1297                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1298                 sdata->u.mntr_flags = MONITOR_FLAG_CONTROL |
1299                                       MONITOR_FLAG_OTHER_BSS;
1300                 break;
1301         case NL80211_IFTYPE_WDS:
1302                 sdata->vif.bss_conf.bssid = NULL;
1303                 break;
1304         case NL80211_IFTYPE_AP_VLAN:
1305                 break;
1306         case NL80211_IFTYPE_P2P_DEVICE:
1307                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1308                 break;
1309         case NL80211_IFTYPE_UNSPECIFIED:
1310         case NUM_NL80211_IFTYPES:
1311                 BUG();
1312                 break;
1313         }
1314
1315         ieee80211_debugfs_add_netdev(sdata);
1316 }
1317
1318 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1319                                            enum nl80211_iftype type)
1320 {
1321         struct ieee80211_local *local = sdata->local;
1322         int ret, err;
1323         enum nl80211_iftype internal_type = type;
1324         bool p2p = false;
1325
1326         ASSERT_RTNL();
1327
1328         if (!local->ops->change_interface)
1329                 return -EBUSY;
1330
1331         switch (sdata->vif.type) {
1332         case NL80211_IFTYPE_AP:
1333         case NL80211_IFTYPE_STATION:
1334         case NL80211_IFTYPE_ADHOC:
1335                 /*
1336                  * Could maybe also all others here?
1337                  * Just not sure how that interacts
1338                  * with the RX/config path e.g. for
1339                  * mesh.
1340                  */
1341                 break;
1342         default:
1343                 return -EBUSY;
1344         }
1345
1346         switch (type) {
1347         case NL80211_IFTYPE_AP:
1348         case NL80211_IFTYPE_STATION:
1349         case NL80211_IFTYPE_ADHOC:
1350                 /*
1351                  * Could probably support everything
1352                  * but WDS here (WDS do_open can fail
1353                  * under memory pressure, which this
1354                  * code isn't prepared to handle).
1355                  */
1356                 break;
1357         case NL80211_IFTYPE_P2P_CLIENT:
1358                 p2p = true;
1359                 internal_type = NL80211_IFTYPE_STATION;
1360                 break;
1361         case NL80211_IFTYPE_P2P_GO:
1362                 p2p = true;
1363                 internal_type = NL80211_IFTYPE_AP;
1364                 break;
1365         default:
1366                 return -EBUSY;
1367         }
1368
1369         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1370         if (ret)
1371                 return ret;
1372
1373         ieee80211_do_stop(sdata, false);
1374
1375         ieee80211_teardown_sdata(sdata);
1376
1377         ret = drv_change_interface(local, sdata, internal_type, p2p);
1378         if (ret)
1379                 type = sdata->vif.type;
1380
1381         /*
1382          * Ignore return value here, there's not much we can do since
1383          * the driver changed the interface type internally already.
1384          * The warnings will hopefully make driver authors fix it :-)
1385          */
1386         ieee80211_check_queues(sdata);
1387
1388         ieee80211_setup_sdata(sdata, type);
1389
1390         err = ieee80211_do_open(&sdata->wdev, false);
1391         WARN(err, "type change: do_open returned %d", err);
1392
1393         return ret;
1394 }
1395
1396 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1397                              enum nl80211_iftype type)
1398 {
1399         int ret;
1400
1401         ASSERT_RTNL();
1402
1403         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1404                 return 0;
1405
1406         if (ieee80211_sdata_running(sdata)) {
1407                 ret = ieee80211_runtime_change_iftype(sdata, type);
1408                 if (ret)
1409                         return ret;
1410         } else {
1411                 /* Purge and reset type-dependent state. */
1412                 ieee80211_teardown_sdata(sdata);
1413                 ieee80211_setup_sdata(sdata, type);
1414         }
1415
1416         /* reset some values that shouldn't be kept across type changes */
1417         sdata->drop_unencrypted = 0;
1418         if (type == NL80211_IFTYPE_STATION)
1419                 sdata->u.mgd.use_4addr = false;
1420
1421         return 0;
1422 }
1423
1424 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1425                                        u8 *perm_addr, enum nl80211_iftype type)
1426 {
1427         struct ieee80211_sub_if_data *sdata;
1428         u64 mask, start, addr, val, inc;
1429         u8 *m;
1430         u8 tmp_addr[ETH_ALEN];
1431         int i;
1432
1433         /* default ... something at least */
1434         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1435
1436         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1437             local->hw.wiphy->n_addresses <= 1)
1438                 return;
1439
1440         mutex_lock(&local->iflist_mtx);
1441
1442         switch (type) {
1443         case NL80211_IFTYPE_MONITOR:
1444                 /* doesn't matter */
1445                 break;
1446         case NL80211_IFTYPE_WDS:
1447         case NL80211_IFTYPE_AP_VLAN:
1448                 /* match up with an AP interface */
1449                 list_for_each_entry(sdata, &local->interfaces, list) {
1450                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1451                                 continue;
1452                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1453                         break;
1454                 }
1455                 /* keep default if no AP interface present */
1456                 break;
1457         case NL80211_IFTYPE_P2P_CLIENT:
1458         case NL80211_IFTYPE_P2P_GO:
1459                 if (local->hw.flags & IEEE80211_HW_P2P_DEV_ADDR_FOR_INTF) {
1460                         list_for_each_entry(sdata, &local->interfaces, list) {
1461                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1462                                         continue;
1463                                 if (!ieee80211_sdata_running(sdata))
1464                                         continue;
1465                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1466                                 goto out_unlock;
1467                         }
1468                 }
1469                 /* otherwise fall through */
1470         default:
1471                 /* assign a new address if possible -- try n_addresses first */
1472                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1473                         bool used = false;
1474
1475                         list_for_each_entry(sdata, &local->interfaces, list) {
1476                                 if (memcmp(local->hw.wiphy->addresses[i].addr,
1477                                            sdata->vif.addr, ETH_ALEN) == 0) {
1478                                         used = true;
1479                                         break;
1480                                 }
1481                         }
1482
1483                         if (!used) {
1484                                 memcpy(perm_addr,
1485                                        local->hw.wiphy->addresses[i].addr,
1486                                        ETH_ALEN);
1487                                 break;
1488                         }
1489                 }
1490
1491                 /* try mask if available */
1492                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1493                         break;
1494
1495                 m = local->hw.wiphy->addr_mask;
1496                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1497                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1498                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1499
1500                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1501                         /* not a contiguous mask ... not handled now! */
1502                         pr_info("not contiguous\n");
1503                         break;
1504                 }
1505
1506                 m = local->hw.wiphy->perm_addr;
1507                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1508                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1509                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1510
1511                 inc = 1ULL<<__ffs64(mask);
1512                 val = (start & mask);
1513                 addr = (start & ~mask) | (val & mask);
1514                 do {
1515                         bool used = false;
1516
1517                         tmp_addr[5] = addr >> 0*8;
1518                         tmp_addr[4] = addr >> 1*8;
1519                         tmp_addr[3] = addr >> 2*8;
1520                         tmp_addr[2] = addr >> 3*8;
1521                         tmp_addr[1] = addr >> 4*8;
1522                         tmp_addr[0] = addr >> 5*8;
1523
1524                         val += inc;
1525
1526                         list_for_each_entry(sdata, &local->interfaces, list) {
1527                                 if (memcmp(tmp_addr, sdata->vif.addr,
1528                                                         ETH_ALEN) == 0) {
1529                                         used = true;
1530                                         break;
1531                                 }
1532                         }
1533
1534                         if (!used) {
1535                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1536                                 break;
1537                         }
1538                         addr = (start & ~mask) | (val & mask);
1539                 } while (addr != start);
1540
1541                 break;
1542         }
1543
1544  out_unlock:
1545         mutex_unlock(&local->iflist_mtx);
1546 }
1547
1548 static void ieee80211_cleanup_sdata_stas_wk(struct work_struct *wk)
1549 {
1550         struct ieee80211_sub_if_data *sdata;
1551
1552         sdata = container_of(wk, struct ieee80211_sub_if_data, cleanup_stations_wk);
1553
1554         ieee80211_cleanup_sdata_stas(sdata);
1555 }
1556
1557 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1558                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1559                      struct vif_params *params)
1560 {
1561         struct net_device *ndev = NULL;
1562         struct ieee80211_sub_if_data *sdata = NULL;
1563         int ret, i;
1564         int txqs = 1;
1565
1566         ASSERT_RTNL();
1567
1568         if (type == NL80211_IFTYPE_P2P_DEVICE) {
1569                 struct wireless_dev *wdev;
1570
1571                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1572                                 GFP_KERNEL);
1573                 if (!sdata)
1574                         return -ENOMEM;
1575                 wdev = &sdata->wdev;
1576
1577                 sdata->dev = NULL;
1578                 strlcpy(sdata->name, name, IFNAMSIZ);
1579                 ieee80211_assign_perm_addr(local, wdev->address, type);
1580                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1581         } else {
1582                 if (local->hw.queues >= IEEE80211_NUM_ACS)
1583                         txqs = IEEE80211_NUM_ACS;
1584
1585                 ndev = alloc_netdev_mqs(sizeof(*sdata) +
1586                                         local->hw.vif_data_size,
1587                                         name, ieee80211_if_setup, txqs, 1);
1588                 if (!ndev)
1589                         return -ENOMEM;
1590                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1591
1592                 ndev->needed_headroom = local->tx_headroom +
1593                                         4*6 /* four MAC addresses */
1594                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1595                                         + 6 /* mesh */
1596                                         + 8 /* rfc1042/bridge tunnel */
1597                                         - ETH_HLEN /* ethernet hard_header_len */
1598                                         + IEEE80211_ENCRYPT_HEADROOM;
1599                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1600
1601                 ret = dev_alloc_name(ndev, ndev->name);
1602                 if (ret < 0) {
1603                         free_netdev(ndev);
1604                         return ret;
1605                 }
1606
1607                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1608                 memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1609                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1610
1611                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1612                 sdata = netdev_priv(ndev);
1613                 ndev->ieee80211_ptr = &sdata->wdev;
1614                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1615                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1616
1617                 sdata->dev = ndev;
1618         }
1619
1620         /* initialise type-independent data */
1621         sdata->wdev.wiphy = local->hw.wiphy;
1622         sdata->local = local;
1623
1624         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1625                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1626
1627         INIT_LIST_HEAD(&sdata->key_list);
1628
1629         spin_lock_init(&sdata->cleanup_stations_lock);
1630         INIT_LIST_HEAD(&sdata->cleanup_stations);
1631         INIT_WORK(&sdata->cleanup_stations_wk, ieee80211_cleanup_sdata_stas_wk);
1632         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1633                           ieee80211_dfs_cac_timer_work);
1634         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1635                           ieee80211_delayed_tailroom_dec);
1636
1637         for (i = 0; i < IEEE80211_NUM_BANDS; i++) {
1638                 struct ieee80211_supported_band *sband;
1639                 sband = local->hw.wiphy->bands[i];
1640                 sdata->rc_rateidx_mask[i] =
1641                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1642                 if (sband)
1643                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1644                                sband->ht_cap.mcs.rx_mask,
1645                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1646                 else
1647                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1648                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1649         }
1650
1651         ieee80211_set_default_queues(sdata);
1652
1653         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1654         sdata->user_power_level = local->user_power_level;
1655
1656         /* setup type-dependent data */
1657         ieee80211_setup_sdata(sdata, type);
1658
1659         if (ndev) {
1660                 if (params) {
1661                         ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1662                         if (type == NL80211_IFTYPE_STATION)
1663                                 sdata->u.mgd.use_4addr = params->use_4addr;
1664                 }
1665
1666                 ndev->features |= local->hw.netdev_features;
1667
1668                 ret = register_netdevice(ndev);
1669                 if (ret) {
1670                         free_netdev(ndev);
1671                         return ret;
1672                 }
1673         }
1674
1675         mutex_lock(&local->iflist_mtx);
1676         list_add_tail_rcu(&sdata->list, &local->interfaces);
1677         mutex_unlock(&local->iflist_mtx);
1678
1679         if (new_wdev)
1680                 *new_wdev = &sdata->wdev;
1681
1682         return 0;
1683 }
1684
1685 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1686 {
1687         ASSERT_RTNL();
1688
1689         mutex_lock(&sdata->local->iflist_mtx);
1690         list_del_rcu(&sdata->list);
1691         mutex_unlock(&sdata->local->iflist_mtx);
1692
1693         synchronize_rcu();
1694
1695         if (sdata->dev) {
1696                 unregister_netdevice(sdata->dev);
1697         } else {
1698                 cfg80211_unregister_wdev(&sdata->wdev);
1699                 kfree(sdata);
1700         }
1701 }
1702
1703 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
1704 {
1705         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
1706                 return;
1707         ieee80211_do_stop(sdata, true);
1708         ieee80211_teardown_sdata(sdata);
1709 }
1710
1711 /*
1712  * Remove all interfaces, may only be called at hardware unregistration
1713  * time because it doesn't do RCU-safe list removals.
1714  */
1715 void ieee80211_remove_interfaces(struct ieee80211_local *local)
1716 {
1717         struct ieee80211_sub_if_data *sdata, *tmp;
1718         LIST_HEAD(unreg_list);
1719         LIST_HEAD(wdev_list);
1720
1721         ASSERT_RTNL();
1722
1723         /*
1724          * Close all AP_VLAN interfaces first, as otherwise they
1725          * might be closed while the AP interface they belong to
1726          * is closed, causing unregister_netdevice_many() to crash.
1727          */
1728         list_for_each_entry(sdata, &local->interfaces, list)
1729                 if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1730                         dev_close(sdata->dev);
1731
1732         mutex_lock(&local->iflist_mtx);
1733         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
1734                 list_del(&sdata->list);
1735
1736                 if (sdata->dev)
1737                         unregister_netdevice_queue(sdata->dev, &unreg_list);
1738                 else
1739                         list_add(&sdata->list, &wdev_list);
1740         }
1741         mutex_unlock(&local->iflist_mtx);
1742         unregister_netdevice_many(&unreg_list);
1743         list_del(&unreg_list);
1744
1745         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
1746                 list_del(&sdata->list);
1747                 cfg80211_unregister_wdev(&sdata->wdev);
1748                 kfree(sdata);
1749         }
1750 }
1751
1752 static int netdev_notify(struct notifier_block *nb,
1753                          unsigned long state,
1754                          void *ndev)
1755 {
1756         struct net_device *dev = ndev;
1757         struct ieee80211_sub_if_data *sdata;
1758
1759         if (state != NETDEV_CHANGENAME)
1760                 return 0;
1761
1762         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
1763                 return 0;
1764
1765         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
1766                 return 0;
1767
1768         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1769
1770         memcpy(sdata->name, dev->name, IFNAMSIZ);
1771
1772         ieee80211_debugfs_rename_netdev(sdata);
1773         return 0;
1774 }
1775
1776 static struct notifier_block mac80211_netdev_notifier = {
1777         .notifier_call = netdev_notify,
1778 };
1779
1780 int ieee80211_iface_init(void)
1781 {
1782         return register_netdevice_notifier(&mac80211_netdev_notifier);
1783 }
1784
1785 void ieee80211_iface_exit(void)
1786 {
1787         unregister_netdevice_notifier(&mac80211_netdev_notifier);
1788 }