net/mac80211/iface.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Interface handling
   4  *
   5  * Copyright 2002-2005, Instant802 Networks, Inc.
   6  * Copyright 2005-2006, Devicescape Software, Inc.
   7  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   8  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   9  * Copyright 2013-2014  Intel Mobile Communications GmbH
  10  * Copyright (c) 2016        Intel Deutschland GmbH
  11  * Copyright (C) 2018-2020 Intel Corporation
  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 static void ieee80211_iface_work(struct work_struct *work);
  46
  47 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  48 {
  49         struct ieee80211_chanctx_conf *chanctx_conf;
  50         int power;
  51
  52         rcu_read_lock();
  53         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  54         if (!chanctx_conf) {
  55                 rcu_read_unlock();
  56                 return false;
  57         }
  58
  59         power = ieee80211_chandef_max_power(&chanctx_conf->def);
  60         rcu_read_unlock();
  61
  62         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  63                 power = min(power, sdata->user_power_level);
  64
  65         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  66                 power = min(power, sdata->ap_power_level);
  67
  68         if (power != sdata->vif.bss_conf.txpower) {
  69                 sdata->vif.bss_conf.txpower = power;
  70                 ieee80211_hw_config(sdata->local, 0);
  71                 return true;
  72         }
  73
  74         return false;
  75 }
  76
  77 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
  78                               bool update_bss)
  79 {
  80         if (__ieee80211_recalc_txpower(sdata) ||
  81             (update_bss && ieee80211_sdata_running(sdata)))
  82                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  83 }
  84
  85 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
  86 {
  87         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  88                 return 0;
  89
  90         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  91         return IEEE80211_CONF_CHANGE_IDLE;
  92 }
  93
  94 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  95 {
  96         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  97                 return 0;
  98
  99         ieee80211_flush_queues(local, NULL, false);
 100
 101         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 102         return IEEE80211_CONF_CHANGE_IDLE;
 103 }
 104
 105 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
 106                                    bool force_active)
 107 {
 108         bool working, scanning, active;
 109         unsigned int led_trig_start = 0, led_trig_stop = 0;
 110
 111         lockdep_assert_held(&local->mtx);
 112
 113         active = force_active ||
 114                  !list_empty(&local->chanctx_list) ||
 115                  local->monitors;
 116
 117         working = !local->ops->remain_on_channel &&
 118                   !list_empty(&local->roc_list);
 119
 120         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 121                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 122
 123         if (working || scanning)
 124                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 125         else
 126                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 127
 128         if (active)
 129                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 130         else
 131                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 132
 133         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 134
 135         if (working || scanning || active)
 136                 return __ieee80211_idle_off(local);
 137         return __ieee80211_idle_on(local);
 138 }
 139
 140 u32 ieee80211_idle_off(struct ieee80211_local *local)
 141 {
 142         return __ieee80211_recalc_idle(local, true);
 143 }
 144
 145 void ieee80211_recalc_idle(struct ieee80211_local *local)
 146 {
 147         u32 change = __ieee80211_recalc_idle(local, false);
 148         if (change)
 149                 ieee80211_hw_config(local, change);
 150 }
 151
 152 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 153                                 bool check_dup)
 154 {
 155         struct ieee80211_local *local = sdata->local;
 156         struct ieee80211_sub_if_data *iter;
 157         u64 new, mask, tmp;
 158         u8 *m;
 159         int ret = 0;
 160
 161         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 162                 return 0;
 163
 164         m = addr;
 165         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 166                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 167                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 168
 169         m = local->hw.wiphy->addr_mask;
 170         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 171                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 172                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 173
 174         if (!check_dup)
 175                 return ret;
 176
 177         mutex_lock(&local->iflist_mtx);
 178         list_for_each_entry(iter, &local->interfaces, list) {
 179                 if (iter == sdata)
 180                         continue;
 181
 182                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 183                     !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 184                         continue;
 185
 186                 m = iter->vif.addr;
 187                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 188                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 189                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 190
 191                 if ((new & ~mask) != (tmp & ~mask)) {
 192                         ret = -EINVAL;
 193                         break;
 194                 }
 195         }
 196         mutex_unlock(&local->iflist_mtx);
 197
 198         return ret;
 199 }
 200
 201 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 202 {
 203         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 204         struct sockaddr *sa = addr;
 205         bool check_dup = true;
 206         int ret;
 207
 208         if (ieee80211_sdata_running(sdata))
 209                 return -EBUSY;
 210
 211         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 212             !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 213                 check_dup = false;
 214
 215         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 216         if (ret)
 217                 return ret;
 218
 219         ret = eth_mac_addr(dev, sa);
 220
 221         if (ret == 0)
 222                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 223
 224         return ret;
 225 }
 226
 227 static inline int identical_mac_addr_allowed(int type1, int type2)
 228 {
 229         return type1 == NL80211_IFTYPE_MONITOR ||
 230                 type2 == NL80211_IFTYPE_MONITOR ||
 231                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 232                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 233                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_WDS) ||
 234                 (type1 == NL80211_IFTYPE_WDS &&
 235                         (type2 == NL80211_IFTYPE_WDS ||
 236                          type2 == NL80211_IFTYPE_AP)) ||
 237                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 238                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 239                         (type2 == NL80211_IFTYPE_AP ||
 240                          type2 == NL80211_IFTYPE_AP_VLAN));
 241 }
 242
 243 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 244                                             enum nl80211_iftype iftype)
 245 {
 246         struct ieee80211_local *local = sdata->local;
 247         struct ieee80211_sub_if_data *nsdata;
 248         int ret;
 249
 250         ASSERT_RTNL();
 251
 252         /* we hold the RTNL here so can safely walk the list */
 253         list_for_each_entry(nsdata, &local->interfaces, list) {
 254                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 255                         /*
 256                          * Only OCB and monitor mode may coexist
 257                          */
 258                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
 259                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
 260                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 261                              nsdata->vif.type == NL80211_IFTYPE_OCB))
 262                                 return -EBUSY;
 263
 264                         /*
 265                          * Allow only a single IBSS interface to be up at any
 266                          * time. This is restricted because beacon distribution
 267                          * cannot work properly if both are in the same IBSS.
 268                          *
 269                          * To remove this restriction we'd have to disallow them
 270                          * from setting the same SSID on different IBSS interfaces
 271                          * belonging to the same hardware. Then, however, we're
 272                          * faced with having to adopt two different TSF timers...
 273                          */
 274                         if (iftype == NL80211_IFTYPE_ADHOC &&
 275                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 276                                 return -EBUSY;
 277                         /*
 278                          * will not add another interface while any channel
 279                          * switch is active.
 280                          */
 281                         if (nsdata->vif.csa_active)
 282                                 return -EBUSY;
 283
 284                         /*
 285                          * The remaining checks are only performed for interfaces
 286                          * with the same MAC address.
 287                          */
 288                         if (!ether_addr_equal(sdata->vif.addr,
 289                                               nsdata->vif.addr))
 290                                 continue;
 291
 292                         /*
 293                          * check whether it may have the same address
 294                          */
 295                         if (!identical_mac_addr_allowed(iftype,
 296                                                         nsdata->vif.type))
 297                                 return -ENOTUNIQ;
 298
 299                         /*
 300                          * can only add VLANs to enabled APs
 301                          */
 302                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 303                             nsdata->vif.type == NL80211_IFTYPE_AP)
 304                                 sdata->bss = &nsdata->u.ap;
 305                 }
 306         }
 307
 308         mutex_lock(&local->chanctx_mtx);
 309         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
 310         mutex_unlock(&local->chanctx_mtx);
 311         return ret;
 312 }
 313
 314 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 315                                   enum nl80211_iftype iftype)
 316 {
 317         int n_queues = sdata->local->hw.queues;
 318         int i;
 319
 320         if (iftype == NL80211_IFTYPE_NAN)
 321                 return 0;
 322
 323         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 324                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 325                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 326                                          IEEE80211_INVAL_HW_QUEUE))
 327                                 return -EINVAL;
 328                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 329                                          n_queues))
 330                                 return -EINVAL;
 331                 }
 332         }
 333
 334         if ((iftype != NL80211_IFTYPE_AP &&
 335              iftype != NL80211_IFTYPE_P2P_GO &&
 336              iftype != NL80211_IFTYPE_MESH_POINT) ||
 337             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
 338                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 339                 return 0;
 340         }
 341
 342         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 343                 return -EINVAL;
 344
 345         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 346                 return -EINVAL;
 347
 348         return 0;
 349 }
 350
 351 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 352                                     const int offset)
 353 {
 354         struct ieee80211_local *local = sdata->local;
 355         u32 flags = sdata->u.mntr.flags;
 356
 357 #define ADJUST(_f, _s)  do {                                    \
 358         if (flags & MONITOR_FLAG_##_f)                          \
 359                 local->fif_##_s += offset;                      \
 360         } while (0)
 361
 362         ADJUST(FCSFAIL, fcsfail);
 363         ADJUST(PLCPFAIL, plcpfail);
 364         ADJUST(CONTROL, control);
 365         ADJUST(CONTROL, pspoll);
 366         ADJUST(OTHER_BSS, other_bss);
 367
 368 #undef ADJUST
 369 }
 370
 371 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 372 {
 373         struct ieee80211_local *local = sdata->local;
 374         int i;
 375
 376         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 377                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
 378                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 379                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 380                         sdata->vif.hw_queue[i] = i;
 381                 else
 382                         sdata->vif.hw_queue[i] = 0;
 383         }
 384         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 385 }
 386
 387 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 388 {
 389         struct ieee80211_sub_if_data *sdata;
 390         int ret;
 391
 392         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 393                 return 0;
 394
 395         ASSERT_RTNL();
 396
 397         if (local->monitor_sdata)
 398                 return 0;
 399
 400         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 401         if (!sdata)
 402                 return -ENOMEM;
 403
 404         /* set up data */
 405         sdata->local = local;
 406         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 407         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 408                  wiphy_name(local->hw.wiphy));
 409         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
 410
 411         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 412
 413         ieee80211_set_default_queues(sdata);
 414
 415         ret = drv_add_interface(local, sdata);
 416         if (WARN_ON(ret)) {
 417                 /* ok .. stupid driver, it asked for this! */
 418                 kfree(sdata);
 419                 return ret;
 420         }
 421
 422         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 423         if (ret) {
 424                 kfree(sdata);
 425                 return ret;
 426         }
 427
 428         mutex_lock(&local->iflist_mtx);
 429         rcu_assign_pointer(local->monitor_sdata, sdata);
 430         mutex_unlock(&local->iflist_mtx);
 431
 432         mutex_lock(&local->mtx);
 433         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 434                                         IEEE80211_CHANCTX_EXCLUSIVE);
 435         mutex_unlock(&local->mtx);
 436         if (ret) {
 437                 mutex_lock(&local->iflist_mtx);
 438                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
 439                 mutex_unlock(&local->iflist_mtx);
 440                 synchronize_net();
 441                 drv_remove_interface(local, sdata);
 442                 kfree(sdata);
 443                 return ret;
 444         }
 445
 446         skb_queue_head_init(&sdata->skb_queue);
 447         INIT_WORK(&sdata->work, ieee80211_iface_work);
 448
 449         return 0;
 450 }
 451
 452 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 453 {
 454         struct ieee80211_sub_if_data *sdata;
 455
 456         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 457                 return;
 458
 459         ASSERT_RTNL();
 460
 461         mutex_lock(&local->iflist_mtx);
 462
 463         sdata = rcu_dereference_protected(local->monitor_sdata,
 464                                           lockdep_is_held(&local->iflist_mtx));
 465         if (!sdata) {
 466                 mutex_unlock(&local->iflist_mtx);
 467                 return;
 468         }
 469
 470         RCU_INIT_POINTER(local->monitor_sdata, NULL);
 471         mutex_unlock(&local->iflist_mtx);
 472
 473         synchronize_net();
 474
 475         mutex_lock(&local->mtx);
 476         ieee80211_vif_release_channel(sdata);
 477         mutex_unlock(&local->mtx);
 478
 479         drv_remove_interface(local, sdata);
 480
 481         kfree(sdata);
 482 }
 483
 484 /*
 485  * NOTE: Be very careful when changing this function, it must NOT return
 486  * an error on interface type changes that have been pre-checked, so most
 487  * checks should be in ieee80211_check_concurrent_iface.
 488  */
 489 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
 490 {
 491         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
 492         struct net_device *dev = wdev->netdev;
 493         struct ieee80211_local *local = sdata->local;
 494         struct sta_info *sta;
 495         u32 changed = 0;
 496         int res;
 497         u32 hw_reconf_flags = 0;
 498
 499         switch (sdata->vif.type) {
 500         case NL80211_IFTYPE_WDS:
 501                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
 502                         return -ENOLINK;
 503                 break;
 504         case NL80211_IFTYPE_AP_VLAN: {
 505                 struct ieee80211_sub_if_data *master;
 506
 507                 if (!sdata->bss)
 508                         return -ENOLINK;
 509
 510                 mutex_lock(&local->mtx);
 511                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
 512                 mutex_unlock(&local->mtx);
 513
 514                 master = container_of(sdata->bss,
 515                                       struct ieee80211_sub_if_data, u.ap);
 516                 sdata->control_port_protocol =
 517                         master->control_port_protocol;
 518                 sdata->control_port_no_encrypt =
 519                         master->control_port_no_encrypt;
 520                 sdata->control_port_over_nl80211 =
 521                         master->control_port_over_nl80211;
 522                 sdata->control_port_no_preauth =
 523                         master->control_port_no_preauth;
 524                 sdata->vif.cab_queue = master->vif.cab_queue;
 525                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
 526                        sizeof(sdata->vif.hw_queue));
 527                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
 528
 529                 mutex_lock(&local->key_mtx);
 530                 sdata->crypto_tx_tailroom_needed_cnt +=
 531                         master->crypto_tx_tailroom_needed_cnt;
 532                 mutex_unlock(&local->key_mtx);
 533
 534                 break;
 535                 }
 536         case NL80211_IFTYPE_AP:
 537                 sdata->bss = &sdata->u.ap;
 538                 break;
 539         case NL80211_IFTYPE_MESH_POINT:
 540         case NL80211_IFTYPE_STATION:
 541         case NL80211_IFTYPE_MONITOR:
 542         case NL80211_IFTYPE_ADHOC:
 543         case NL80211_IFTYPE_P2P_DEVICE:
 544         case NL80211_IFTYPE_OCB:
 545         case NL80211_IFTYPE_NAN:
 546                 /* no special treatment */
 547                 break;
 548         case NL80211_IFTYPE_UNSPECIFIED:
 549         case NUM_NL80211_IFTYPES:
 550         case NL80211_IFTYPE_P2P_CLIENT:
 551         case NL80211_IFTYPE_P2P_GO:
 552                 /* cannot happen */
 553                 WARN_ON(1);
 554                 break;
 555         }
 556
 557         if (local->open_count == 0) {
 558                 res = drv_start(local);
 559                 if (res)
 560                         goto err_del_bss;
 561                 /* we're brought up, everything changes */
 562                 hw_reconf_flags = ~0;
 563                 ieee80211_led_radio(local, true);
 564                 ieee80211_mod_tpt_led_trig(local,
 565                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
 566         }
 567
 568         /*
 569          * Copy the hopefully now-present MAC address to
 570          * this interface, if it has the special null one.
 571          */
 572         if (dev && is_zero_ether_addr(dev->dev_addr)) {
 573                 memcpy(dev->dev_addr,
 574                        local->hw.wiphy->perm_addr,
 575                        ETH_ALEN);
 576                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
 577
 578                 if (!is_valid_ether_addr(dev->dev_addr)) {
 579                         res = -EADDRNOTAVAIL;
 580                         goto err_stop;
 581                 }
 582         }
 583
 584         switch (sdata->vif.type) {
 585         case NL80211_IFTYPE_AP_VLAN:
 586                 /* no need to tell driver, but set carrier and chanctx */
 587                 if (rtnl_dereference(sdata->bss->beacon)) {
 588                         ieee80211_vif_vlan_copy_chanctx(sdata);
 589                         netif_carrier_on(dev);
 590                 } else {
 591                         netif_carrier_off(dev);
 592                 }
 593                 break;
 594         case NL80211_IFTYPE_MONITOR:
 595                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 596                         local->cooked_mntrs++;
 597                         break;
 598                 }
 599
 600                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
 601                         res = drv_add_interface(local, sdata);
 602                         if (res)
 603                                 goto err_stop;
 604                 } else if (local->monitors == 0 && local->open_count == 0) {
 605                         res = ieee80211_add_virtual_monitor(local);
 606                         if (res)
 607                                 goto err_stop;
 608                 }
 609
 610                 /* must be before the call to ieee80211_configure_filter */
 611                 local->monitors++;
 612                 if (local->monitors == 1) {
 613                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
 614                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 615                 }
 616
 617                 ieee80211_adjust_monitor_flags(sdata, 1);
 618                 ieee80211_configure_filter(local);
 619                 mutex_lock(&local->mtx);
 620                 ieee80211_recalc_idle(local);
 621                 mutex_unlock(&local->mtx);
 622
 623                 netif_carrier_on(dev);
 624                 break;
 625         default:
 626                 if (coming_up) {
 627                         ieee80211_del_virtual_monitor(local);
 628
 629                         res = drv_add_interface(local, sdata);
 630                         if (res)
 631                                 goto err_stop;
 632                         res = ieee80211_check_queues(sdata,
 633                                 ieee80211_vif_type_p2p(&sdata->vif));
 634                         if (res)
 635                                 goto err_del_interface;
 636                 }
 637
 638                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
 639                         local->fif_pspoll++;
 640                         local->fif_probe_req++;
 641
 642                         ieee80211_configure_filter(local);
 643                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 644                         local->fif_probe_req++;
 645                 }
 646
 647                 if (sdata->vif.probe_req_reg)
 648                         drv_config_iface_filter(local, sdata,
 649                                                 FIF_PROBE_REQ,
 650                                                 FIF_PROBE_REQ);
 651
 652                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
 653                     sdata->vif.type != NL80211_IFTYPE_NAN)
 654                         changed |= ieee80211_reset_erp_info(sdata);
 655                 ieee80211_bss_info_change_notify(sdata, changed);
 656
 657                 switch (sdata->vif.type) {
 658                 case NL80211_IFTYPE_STATION:
 659                 case NL80211_IFTYPE_ADHOC:
 660                 case NL80211_IFTYPE_AP:
 661                 case NL80211_IFTYPE_MESH_POINT:
 662                 case NL80211_IFTYPE_OCB:
 663                         netif_carrier_off(dev);
 664                         break;
 665                 case NL80211_IFTYPE_WDS:
 666                 case NL80211_IFTYPE_P2P_DEVICE:
 667                 case NL80211_IFTYPE_NAN:
 668                         break;
 669                 default:
 670                         /* not reached */
 671                         WARN_ON(1);
 672                 }
 673
 674                 /*
 675                  * Set default queue parameters so drivers don't
 676                  * need to initialise the hardware if the hardware
 677                  * doesn't start up with sane defaults.
 678                  * Enable QoS for anything but station interfaces.
 679                  */
 680                 ieee80211_set_wmm_default(sdata, true,
 681                         sdata->vif.type != NL80211_IFTYPE_STATION);
 682         }
 683
 684         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 685
 686         switch (sdata->vif.type) {
 687         case NL80211_IFTYPE_WDS:
 688                 /* Create STA entry for the WDS peer */
 689                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
 690                                      GFP_KERNEL);
 691                 if (!sta) {
 692                         res = -ENOMEM;
 693                         goto err_del_interface;
 694                 }
 695
 696                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
 697                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
 698                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
 699
 700                 res = sta_info_insert(sta);
 701                 if (res) {
 702                         /* STA has been freed */
 703                         goto err_del_interface;
 704                 }
 705
 706                 rate_control_rate_init(sta);
 707                 netif_carrier_on(dev);
 708                 break;
 709         case NL80211_IFTYPE_P2P_DEVICE:
 710                 rcu_assign_pointer(local->p2p_sdata, sdata);
 711                 break;
 712         case NL80211_IFTYPE_MONITOR:
 713                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
 714                         break;
 715                 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
 716                 break;
 717         default:
 718                 break;
 719         }
 720
 721         /*
 722          * set_multicast_list will be invoked by the networking core
 723          * which will check whether any increments here were done in
 724          * error and sync them down to the hardware as filter flags.
 725          */
 726         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 727                 atomic_inc(&local->iff_allmultis);
 728
 729         if (coming_up)
 730                 local->open_count++;
 731
 732         if (hw_reconf_flags)
 733                 ieee80211_hw_config(local, hw_reconf_flags);
 734
 735         ieee80211_recalc_ps(local);
 736
 737         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
 738             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
 739             local->ops->wake_tx_queue) {
 740                 /* XXX: for AP_VLAN, actually track AP queues */
 741                 if (dev)
 742                         netif_tx_start_all_queues(dev);
 743         } else if (dev) {
 744                 unsigned long flags;
 745                 int n_acs = IEEE80211_NUM_ACS;
 746                 int ac;
 747
 748                 if (local->hw.queues < IEEE80211_NUM_ACS)
 749                         n_acs = 1;
 750
 751                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 752                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
 753                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
 754                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
 755                         for (ac = 0; ac < n_acs; ac++) {
 756                                 int ac_queue = sdata->vif.hw_queue[ac];
 757
 758                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
 759                                     skb_queue_empty(&local->pending[ac_queue]))
 760                                         netif_start_subqueue(dev, ac);
 761                         }
 762                 }
 763                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 764         }
 765
 766         return 0;
 767  err_del_interface:
 768         drv_remove_interface(local, sdata);
 769  err_stop:
 770         if (!local->open_count)
 771                 drv_stop(local);
 772  err_del_bss:
 773         sdata->bss = NULL;
 774         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 775                 mutex_lock(&local->mtx);
 776                 list_del(&sdata->u.vlan.list);
 777                 mutex_unlock(&local->mtx);
 778         }
 779         /* might already be clear but that doesn't matter */
 780         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 781         return res;
 782 }
 783
 784 static int ieee80211_open(struct net_device *dev)
 785 {
 786         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 787         int err;
 788
 789         /* fail early if user set an invalid address */
 790         if (!is_valid_ether_addr(dev->dev_addr))
 791                 return -EADDRNOTAVAIL;
 792
 793         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 794         if (err)
 795                 return err;
 796
 797         return ieee80211_do_open(&sdata->wdev, true);
 798 }
 799
 800 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 801                               bool going_down)
 802 {
 803         struct ieee80211_local *local = sdata->local;
 804         unsigned long flags;
 805         struct sk_buff *skb, *tmp;
 806         u32 hw_reconf_flags = 0;
 807         int i, flushed;
 808         struct ps_data *ps;
 809         struct cfg80211_chan_def chandef;
 810         bool cancel_scan;
 811         struct cfg80211_nan_func *func;
 812
 813         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 814
 815         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 816         if (cancel_scan)
 817                 ieee80211_scan_cancel(local);
 818
 819         /*
 820          * Stop TX on this interface first.
 821          */
 822         if (sdata->dev)
 823                 netif_tx_stop_all_queues(sdata->dev);
 824
 825         ieee80211_roc_purge(local, sdata);
 826
 827         switch (sdata->vif.type) {
 828         case NL80211_IFTYPE_STATION:
 829                 ieee80211_mgd_stop(sdata);
 830                 break;
 831         case NL80211_IFTYPE_ADHOC:
 832                 ieee80211_ibss_stop(sdata);
 833                 break;
 834         case NL80211_IFTYPE_MONITOR:
 835                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
 836                         break;
 837                 list_del_rcu(&sdata->u.mntr.list);
 838                 break;
 839         default:
 840                 break;
 841         }
 842
 843         /*
 844          * Remove all stations associated with this interface.
 845          *
 846          * This must be done before calling ops->remove_interface()
 847          * because otherwise we can later invoke ops->sta_notify()
 848          * whenever the STAs are removed, and that invalidates driver
 849          * assumptions about always getting a vif pointer that is valid
 850          * (because if we remove a STA after ops->remove_interface()
 851          * the driver will have removed the vif info already!)
 852          *
 853          * In WDS mode a station must exist here and be flushed, for
 854          * AP_VLANs stations may exist since there's nothing else that
 855          * would have removed them, but in other modes there shouldn't
 856          * be any stations.
 857          */
 858         flushed = sta_info_flush(sdata);
 859         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
 860                      ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 861                       (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
 862
 863         /* don't count this interface for allmulti while it is down */
 864         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 865                 atomic_dec(&local->iff_allmultis);
 866
 867         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 868                 local->fif_pspoll--;
 869                 local->fif_probe_req--;
 870         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 871                 local->fif_probe_req--;
 872         }
 873
 874         if (sdata->dev) {
 875                 netif_addr_lock_bh(sdata->dev);
 876                 spin_lock_bh(&local->filter_lock);
 877                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 878                                  sdata->dev->addr_len);
 879                 spin_unlock_bh(&local->filter_lock);
 880                 netif_addr_unlock_bh(sdata->dev);
 881         }
 882
 883         del_timer_sync(&local->dynamic_ps_timer);
 884         cancel_work_sync(&local->dynamic_ps_enable_work);
 885
 886         cancel_work_sync(&sdata->recalc_smps);
 887         sdata_lock(sdata);
 888         mutex_lock(&local->mtx);
 889         sdata->vif.csa_active = false;
 890         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 891                 sdata->u.mgd.csa_waiting_bcn = false;
 892         if (sdata->csa_block_tx) {
 893                 ieee80211_wake_vif_queues(local, sdata,
 894                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 895                 sdata->csa_block_tx = false;
 896         }
 897         mutex_unlock(&local->mtx);
 898         sdata_unlock(sdata);
 899
 900         cancel_work_sync(&sdata->csa_finalize_work);
 901
 902         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 903
 904         if (sdata->wdev.cac_started) {
 905                 chandef = sdata->vif.bss_conf.chandef;
 906                 WARN_ON(local->suspended);
 907                 mutex_lock(&local->mtx);
 908                 ieee80211_vif_release_channel(sdata);
 909                 mutex_unlock(&local->mtx);
 910                 cfg80211_cac_event(sdata->dev, &chandef,
 911                                    NL80211_RADAR_CAC_ABORTED,
 912                                    GFP_KERNEL);
 913         }
 914
 915         /* APs need special treatment */
 916         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 917                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 918
 919                 /* down all dependent devices, that is VLANs */
 920                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 921                                          u.vlan.list)
 922                         dev_close(vlan->dev);
 923                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 924         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 925                 /* remove all packets in parent bc_buf pointing to this dev */
 926                 ps = &sdata->bss->ps;
 927
 928                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 929                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 930                         if (skb->dev == sdata->dev) {
 931                                 __skb_unlink(skb, &ps->bc_buf);
 932                                 local->total_ps_buffered--;
 933                                 ieee80211_free_txskb(&local->hw, skb);
 934                         }
 935                 }
 936                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 937         }
 938
 939         if (going_down)
 940                 local->open_count--;
 941
 942         switch (sdata->vif.type) {
 943         case NL80211_IFTYPE_AP_VLAN:
 944                 mutex_lock(&local->mtx);
 945                 list_del(&sdata->u.vlan.list);
 946                 mutex_unlock(&local->mtx);
 947                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 948                 /* see comment in the default case below */
 949                 ieee80211_free_keys(sdata, true);
 950                 /* no need to tell driver */
 951                 break;
 952         case NL80211_IFTYPE_MONITOR:
 953                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 954                         local->cooked_mntrs--;
 955                         break;
 956                 }
 957
 958                 local->monitors--;
 959                 if (local->monitors == 0) {
 960                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 961                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 962                 }
 963
 964                 ieee80211_adjust_monitor_flags(sdata, -1);
 965                 break;
 966         case NL80211_IFTYPE_NAN:
 967                 /* clean all the functions */
 968                 spin_lock_bh(&sdata->u.nan.func_lock);
 969
 970                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
 971                         idr_remove(&sdata->u.nan.function_inst_ids, i);
 972                         cfg80211_free_nan_func(func);
 973                 }
 974                 idr_destroy(&sdata->u.nan.function_inst_ids);
 975
 976                 spin_unlock_bh(&sdata->u.nan.func_lock);
 977                 break;
 978         case NL80211_IFTYPE_P2P_DEVICE:
 979                 /* relies on synchronize_rcu() below */
 980                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 981                 fallthrough;
 982         default:
 983                 cancel_work_sync(&sdata->work);
 984                 /*
 985                  * When we get here, the interface is marked down.
 986                  * Free the remaining keys, if there are any
 987                  * (which can happen in AP mode if userspace sets
 988                  * keys before the interface is operating, and maybe
 989                  * also in WDS mode)
 990                  *
 991                  * Force the key freeing to always synchronize_net()
 992                  * to wait for the RX path in case it is using this
 993                  * interface enqueuing frames at this very time on
 994                  * another CPU.
 995                  */
 996                 ieee80211_free_keys(sdata, true);
 997                 skb_queue_purge(&sdata->skb_queue);
 998         }
 999
1000         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1001         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
1002                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
1003                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1004                         if (info->control.vif == &sdata->vif) {
1005                                 __skb_unlink(skb, &local->pending[i]);
1006                                 ieee80211_free_txskb(&local->hw, skb);
1007                         }
1008                 }
1009         }
1010         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1011
1012         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1013                 ieee80211_txq_remove_vlan(local, sdata);
1014
1015         sdata->bss = NULL;
1016
1017         if (local->open_count == 0)
1018                 ieee80211_clear_tx_pending(local);
1019
1020         sdata->vif.bss_conf.beacon_int = 0;
1021
1022         /*
1023          * If the interface goes down while suspended, presumably because
1024          * the device was unplugged and that happens before our resume,
1025          * then the driver is already unconfigured and the remainder of
1026          * this function isn't needed.
1027          * XXX: what about WoWLAN? If the device has software state, e.g.
1028          *      memory allocated, it might expect teardown commands from
1029          *      mac80211 here?
1030          */
1031         if (local->suspended) {
1032                 WARN_ON(local->wowlan);
1033                 WARN_ON(rtnl_dereference(local->monitor_sdata));
1034                 return;
1035         }
1036
1037         switch (sdata->vif.type) {
1038         case NL80211_IFTYPE_AP_VLAN:
1039                 break;
1040         case NL80211_IFTYPE_MONITOR:
1041                 if (local->monitors == 0)
1042                         ieee80211_del_virtual_monitor(local);
1043
1044                 mutex_lock(&local->mtx);
1045                 ieee80211_recalc_idle(local);
1046                 mutex_unlock(&local->mtx);
1047
1048                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
1049                         break;
1050
1051                 fallthrough;
1052         default:
1053                 if (going_down)
1054                         drv_remove_interface(local, sdata);
1055         }
1056
1057         ieee80211_recalc_ps(local);
1058
1059         if (cancel_scan)
1060                 flush_delayed_work(&local->scan_work);
1061
1062         if (local->open_count == 0) {
1063                 ieee80211_stop_device(local);
1064
1065                 /* no reconfiguring after stop! */
1066                 return;
1067         }
1068
1069         /* do after stop to avoid reconfiguring when we stop anyway */
1070         ieee80211_configure_filter(local);
1071         ieee80211_hw_config(local, hw_reconf_flags);
1072
1073         if (local->monitors == local->open_count)
1074                 ieee80211_add_virtual_monitor(local);
1075 }
1076
1077 static int ieee80211_stop(struct net_device *dev)
1078 {
1079         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1080
1081         ieee80211_do_stop(sdata, true);
1082
1083         return 0;
1084 }
1085
1086 static void ieee80211_set_multicast_list(struct net_device *dev)
1087 {
1088         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1089         struct ieee80211_local *local = sdata->local;
1090         int allmulti, sdata_allmulti;
1091
1092         allmulti = !!(dev->flags & IFF_ALLMULTI);
1093         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
1094
1095         if (allmulti != sdata_allmulti) {
1096                 if (dev->flags & IFF_ALLMULTI)
1097                         atomic_inc(&local->iff_allmultis);
1098                 else
1099                         atomic_dec(&local->iff_allmultis);
1100                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
1101         }
1102
1103         spin_lock_bh(&local->filter_lock);
1104         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
1105         spin_unlock_bh(&local->filter_lock);
1106         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
1107 }
1108
1109 /*
1110  * Called when the netdev is removed or, by the code below, before
1111  * the interface type changes.
1112  */
1113 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
1114 {
1115         int i;
1116
1117         /* free extra data */
1118         ieee80211_free_keys(sdata, false);
1119
1120         ieee80211_debugfs_remove_netdev(sdata);
1121
1122         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1123                 __skb_queue_purge(&sdata->fragments[i].skb_list);
1124         sdata->fragment_next = 0;
1125
1126         if (ieee80211_vif_is_mesh(&sdata->vif))
1127                 ieee80211_mesh_teardown_sdata(sdata);
1128 }
1129
1130 static void ieee80211_uninit(struct net_device *dev)
1131 {
1132         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
1133 }
1134
1135 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
1136                                          struct sk_buff *skb,
1137                                          struct net_device *sb_dev)
1138 {
1139         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
1140 }
1141
1142 static void
1143 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
1144 {
1145         int i;
1146
1147         for_each_possible_cpu(i) {
1148                 const struct pcpu_sw_netstats *tstats;
1149                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
1150                 unsigned int start;
1151
1152                 tstats = per_cpu_ptr(dev->tstats, i);
1153
1154                 do {
1155                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
1156                         rx_packets = tstats->rx_packets;
1157                         tx_packets = tstats->tx_packets;
1158                         rx_bytes = tstats->rx_bytes;
1159                         tx_bytes = tstats->tx_bytes;
1160                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
1161
1162                 stats->rx_packets += rx_packets;
1163                 stats->tx_packets += tx_packets;
1164                 stats->rx_bytes   += rx_bytes;
1165                 stats->tx_bytes   += tx_bytes;
1166         }
1167 }
1168
1169 static const struct net_device_ops ieee80211_dataif_ops = {
1170         .ndo_open               = ieee80211_open,
1171         .ndo_stop               = ieee80211_stop,
1172         .ndo_uninit             = ieee80211_uninit,
1173         .ndo_start_xmit         = ieee80211_subif_start_xmit,
1174         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1175         .ndo_set_mac_address    = ieee80211_change_mac,
1176         .ndo_select_queue       = ieee80211_netdev_select_queue,
1177         .ndo_get_stats64        = ieee80211_get_stats64,
1178 };
1179
1180 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
1181                                           struct sk_buff *skb,
1182                                           struct net_device *sb_dev)
1183 {
1184         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1185         struct ieee80211_local *local = sdata->local;
1186         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
1187         struct ieee80211_hdr *hdr;
1188         int len_rthdr;
1189
1190         if (local->hw.queues < IEEE80211_NUM_ACS)
1191                 return 0;
1192
1193         /* reset flags and info before parsing radiotap header */
1194         memset(info, 0, sizeof(*info));
1195
1196         if (!ieee80211_parse_tx_radiotap(skb, dev))
1197                 return 0; /* doesn't matter, frame will be dropped */
1198
1199         len_rthdr = ieee80211_get_radiotap_len(skb->data);
1200         hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
1201         if (skb->len < len_rthdr + 2 ||
1202             skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
1203                 return 0; /* doesn't matter, frame will be dropped */
1204
1205         return ieee80211_select_queue_80211(sdata, skb, hdr);
1206 }
1207
1208 static const struct net_device_ops ieee80211_monitorif_ops = {
1209         .ndo_open               = ieee80211_open,
1210         .ndo_stop               = ieee80211_stop,
1211         .ndo_uninit             = ieee80211_uninit,
1212         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
1213         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1214         .ndo_set_mac_address    = ieee80211_change_mac,
1215         .ndo_select_queue       = ieee80211_monitor_select_queue,
1216         .ndo_get_stats64        = ieee80211_get_stats64,
1217 };
1218
1219 static const struct net_device_ops ieee80211_dataif_8023_ops = {
1220         .ndo_open               = ieee80211_open,
1221         .ndo_stop               = ieee80211_stop,
1222         .ndo_uninit             = ieee80211_uninit,
1223         .ndo_start_xmit         = ieee80211_subif_start_xmit_8023,
1224         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
1225         .ndo_set_mac_address    = ieee80211_change_mac,
1226         .ndo_select_queue       = ieee80211_netdev_select_queue,
1227         .ndo_get_stats64        = ieee80211_get_stats64,
1228 };
1229
1230 static void __ieee80211_set_hw_80211_encap(struct ieee80211_sub_if_data *sdata,
1231                                            bool enable)
1232 {
1233         sdata->dev->netdev_ops = enable ? &ieee80211_dataif_8023_ops :
1234                                           &ieee80211_dataif_ops;
1235         sdata->hw_80211_encap = enable;
1236 }
1237
1238 bool ieee80211_set_hw_80211_encap(struct ieee80211_vif *vif, bool enable)
1239 {
1240         struct ieee80211_sub_if_data *sdata = vif_to_sdata(vif);
1241         struct ieee80211_local *local = sdata->local;
1242         struct ieee80211_sub_if_data *iter;
1243         struct ieee80211_key *key;
1244
1245         mutex_lock(&local->iflist_mtx);
1246         list_for_each_entry(iter, &local->interfaces, list) {
1247                 struct ieee80211_sub_if_data *disable = NULL;
1248
1249                 if (vif->type == NL80211_IFTYPE_MONITOR) {
1250                         disable = iter;
1251                         __ieee80211_set_hw_80211_encap(iter, false);
1252                 } else if (iter->vif.type == NL80211_IFTYPE_MONITOR) {
1253                         disable = sdata;
1254                         enable = false;
1255                 }
1256                 if (disable)
1257                         sdata_dbg(disable,
1258                                   "disable hw 80211 encap due to mon co-exist\n");
1259         }
1260         mutex_unlock(&local->iflist_mtx);
1261
1262         if (enable == sdata->hw_80211_encap)
1263                 return enable;
1264
1265         if (!sdata->dev)
1266                 return false;
1267
1268         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
1269             (local->hw.wiphy->frag_threshold != (u32)-1))
1270                 enable = false;
1271
1272         mutex_lock(&sdata->local->key_mtx);
1273         list_for_each_entry(key, &sdata->key_list, list) {
1274                 if (key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)
1275                         enable = false;
1276         }
1277         mutex_unlock(&sdata->local->key_mtx);
1278
1279         __ieee80211_set_hw_80211_encap(sdata, enable);
1280
1281         return enable;
1282 }
1283 EXPORT_SYMBOL(ieee80211_set_hw_80211_encap);
1284
1285 static void ieee80211_if_free(struct net_device *dev)
1286 {
1287         free_percpu(dev->tstats);
1288 }
1289
1290 static void ieee80211_if_setup(struct net_device *dev)
1291 {
1292         ether_setup(dev);
1293         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1294         dev->netdev_ops = &ieee80211_dataif_ops;
1295         dev->needs_free_netdev = true;
1296         dev->priv_destructor = ieee80211_if_free;
1297 }
1298
1299 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1300 {
1301         ieee80211_if_setup(dev);
1302         dev->priv_flags |= IFF_NO_QUEUE;
1303 }
1304
1305 static void ieee80211_iface_work(struct work_struct *work)
1306 {
1307         struct ieee80211_sub_if_data *sdata =
1308                 container_of(work, struct ieee80211_sub_if_data, work);
1309         struct ieee80211_local *local = sdata->local;
1310         struct sk_buff *skb;
1311         struct sta_info *sta;
1312
1313         if (!ieee80211_sdata_running(sdata))
1314                 return;
1315
1316         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1317                 return;
1318
1319         if (!ieee80211_can_run_worker(local))
1320                 return;
1321
1322         /* first process frames */
1323         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1324                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1325
1326                 if (ieee80211_is_action(mgmt->frame_control) &&
1327                     mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1328                         int len = skb->len;
1329
1330                         mutex_lock(&local->sta_mtx);
1331                         sta = sta_info_get_bss(sdata, mgmt->sa);
1332                         if (sta) {
1333                                 switch (mgmt->u.action.u.addba_req.action_code) {
1334                                 case WLAN_ACTION_ADDBA_REQ:
1335                                         ieee80211_process_addba_request(
1336                                                         local, sta, mgmt, len);
1337                                         break;
1338                                 case WLAN_ACTION_ADDBA_RESP:
1339                                         ieee80211_process_addba_resp(local, sta,
1340                                                                      mgmt, len);
1341                                         break;
1342                                 case WLAN_ACTION_DELBA:
1343                                         ieee80211_process_delba(sdata, sta,
1344                                                                 mgmt, len);
1345                                         break;
1346                                 default:
1347                                         WARN_ON(1);
1348                                         break;
1349                                 }
1350                         }
1351                         mutex_unlock(&local->sta_mtx);
1352                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1353                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1354                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1355                         case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1356                                 struct ieee80211_rx_status *status;
1357                                 enum nl80211_band band;
1358                                 u8 opmode;
1359
1360                                 status = IEEE80211_SKB_RXCB(skb);
1361                                 band = status->band;
1362                                 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1363
1364                                 mutex_lock(&local->sta_mtx);
1365                                 sta = sta_info_get_bss(sdata, mgmt->sa);
1366
1367                                 if (sta)
1368                                         ieee80211_vht_handle_opmode(sdata, sta,
1369                                                                     opmode,
1370                                                                     band);
1371
1372                                 mutex_unlock(&local->sta_mtx);
1373                                 break;
1374                         }
1375                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1376                                 ieee80211_process_mu_groups(sdata, mgmt);
1377                                 break;
1378                         default:
1379                                 WARN_ON(1);
1380                                 break;
1381                         }
1382                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1383                         struct ieee80211_hdr *hdr = (void *)mgmt;
1384                         /*
1385                          * So the frame isn't mgmt, but frame_control
1386                          * is at the right place anyway, of course, so
1387                          * the if statement is correct.
1388                          *
1389                          * Warn if we have other data frame types here,
1390                          * they must not get here.
1391                          */
1392                         WARN_ON(hdr->frame_control &
1393                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1394                         WARN_ON(!(hdr->seq_ctrl &
1395                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1396                         /*
1397                          * This was a fragment of a frame, received while
1398                          * a block-ack session was active. That cannot be
1399                          * right, so terminate the session.
1400                          */
1401                         mutex_lock(&local->sta_mtx);
1402                         sta = sta_info_get_bss(sdata, mgmt->sa);
1403                         if (sta) {
1404                                 u16 tid = ieee80211_get_tid(hdr);
1405
1406                                 __ieee80211_stop_rx_ba_session(
1407                                         sta, tid, WLAN_BACK_RECIPIENT,
1408                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1409                                         true);
1410                         }
1411                         mutex_unlock(&local->sta_mtx);
1412                 } else switch (sdata->vif.type) {
1413                 case NL80211_IFTYPE_STATION:
1414                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1415                         break;
1416                 case NL80211_IFTYPE_ADHOC:
1417                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1418                         break;
1419                 case NL80211_IFTYPE_MESH_POINT:
1420                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1421                                 break;
1422                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1423                         break;
1424                 default:
1425                         WARN(1, "frame for unexpected interface type");
1426                         break;
1427                 }
1428
1429                 kfree_skb(skb);
1430         }
1431
1432         /* then other type-dependent work */
1433         switch (sdata->vif.type) {
1434         case NL80211_IFTYPE_STATION:
1435                 ieee80211_sta_work(sdata);
1436                 break;
1437         case NL80211_IFTYPE_ADHOC:
1438                 ieee80211_ibss_work(sdata);
1439                 break;
1440         case NL80211_IFTYPE_MESH_POINT:
1441                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1442                         break;
1443                 ieee80211_mesh_work(sdata);
1444                 break;
1445         case NL80211_IFTYPE_OCB:
1446                 ieee80211_ocb_work(sdata);
1447                 break;
1448         default:
1449                 break;
1450         }
1451 }
1452
1453 static void ieee80211_recalc_smps_work(struct work_struct *work)
1454 {
1455         struct ieee80211_sub_if_data *sdata =
1456                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1457
1458         ieee80211_recalc_smps(sdata);
1459 }
1460
1461 /*
1462  * Helper function to initialise an interface to a specific type.
1463  */
1464 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1465                                   enum nl80211_iftype type)
1466 {
1467         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1468                                                     0xff, 0xff, 0xff};
1469
1470         /* clear type-dependent union */
1471         memset(&sdata->u, 0, sizeof(sdata->u));
1472
1473         /* and set some type-dependent values */
1474         sdata->vif.type = type;
1475         sdata->vif.p2p = false;
1476         sdata->wdev.iftype = type;
1477
1478         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1479         sdata->control_port_no_encrypt = false;
1480         sdata->control_port_over_nl80211 = false;
1481         sdata->control_port_no_preauth = false;
1482         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1483         sdata->vif.bss_conf.idle = true;
1484         sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1485
1486         sdata->noack_map = 0;
1487         sdata->hw_80211_encap = false;
1488
1489         /* only monitor/p2p-device differ */
1490         if (sdata->dev) {
1491                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1492                 sdata->dev->type = ARPHRD_ETHER;
1493         }
1494
1495         skb_queue_head_init(&sdata->skb_queue);
1496         INIT_WORK(&sdata->work, ieee80211_iface_work);
1497         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1498         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1499         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1500         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1501
1502         switch (type) {
1503         case NL80211_IFTYPE_P2P_GO:
1504                 type = NL80211_IFTYPE_AP;
1505                 sdata->vif.type = type;
1506                 sdata->vif.p2p = true;
1507                 fallthrough;
1508         case NL80211_IFTYPE_AP:
1509                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1510                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1511                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1512                 break;
1513         case NL80211_IFTYPE_P2P_CLIENT:
1514                 type = NL80211_IFTYPE_STATION;
1515                 sdata->vif.type = type;
1516                 sdata->vif.p2p = true;
1517                 fallthrough;
1518         case NL80211_IFTYPE_STATION:
1519                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1520                 ieee80211_sta_setup_sdata(sdata);
1521                 break;
1522         case NL80211_IFTYPE_OCB:
1523                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1524                 ieee80211_ocb_setup_sdata(sdata);
1525                 break;
1526         case NL80211_IFTYPE_ADHOC:
1527                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1528                 ieee80211_ibss_setup_sdata(sdata);
1529                 break;
1530         case NL80211_IFTYPE_MESH_POINT:
1531                 if (ieee80211_vif_is_mesh(&sdata->vif))
1532                         ieee80211_mesh_init_sdata(sdata);
1533                 break;
1534         case NL80211_IFTYPE_MONITOR:
1535                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1536                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1537                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1538                                       MONITOR_FLAG_OTHER_BSS;
1539                 break;
1540         case NL80211_IFTYPE_WDS:
1541                 sdata->vif.bss_conf.bssid = NULL;
1542                 break;
1543         case NL80211_IFTYPE_NAN:
1544                 idr_init(&sdata->u.nan.function_inst_ids);
1545                 spin_lock_init(&sdata->u.nan.func_lock);
1546                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1547                 break;
1548         case NL80211_IFTYPE_AP_VLAN:
1549         case NL80211_IFTYPE_P2P_DEVICE:
1550                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1551                 break;
1552         case NL80211_IFTYPE_UNSPECIFIED:
1553         case NUM_NL80211_IFTYPES:
1554                 WARN_ON(1);
1555                 break;
1556         }
1557
1558         ieee80211_debugfs_add_netdev(sdata);
1559 }
1560
1561 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1562                                            enum nl80211_iftype type)
1563 {
1564         struct ieee80211_local *local = sdata->local;
1565         int ret, err;
1566         enum nl80211_iftype internal_type = type;
1567         bool p2p = false;
1568
1569         ASSERT_RTNL();
1570
1571         if (!local->ops->change_interface)
1572                 return -EBUSY;
1573
1574         switch (sdata->vif.type) {
1575         case NL80211_IFTYPE_AP:
1576         case NL80211_IFTYPE_STATION:
1577         case NL80211_IFTYPE_ADHOC:
1578         case NL80211_IFTYPE_OCB:
1579                 /*
1580                  * Could maybe also all others here?
1581                  * Just not sure how that interacts
1582                  * with the RX/config path e.g. for
1583                  * mesh.
1584                  */
1585                 break;
1586         default:
1587                 return -EBUSY;
1588         }
1589
1590         switch (type) {
1591         case NL80211_IFTYPE_AP:
1592         case NL80211_IFTYPE_STATION:
1593         case NL80211_IFTYPE_ADHOC:
1594         case NL80211_IFTYPE_OCB:
1595                 /*
1596                  * Could probably support everything
1597                  * but WDS here (WDS do_open can fail
1598                  * under memory pressure, which this
1599                  * code isn't prepared to handle).
1600                  */
1601                 break;
1602         case NL80211_IFTYPE_P2P_CLIENT:
1603                 p2p = true;
1604                 internal_type = NL80211_IFTYPE_STATION;
1605                 break;
1606         case NL80211_IFTYPE_P2P_GO:
1607                 p2p = true;
1608                 internal_type = NL80211_IFTYPE_AP;
1609                 break;
1610         default:
1611                 return -EBUSY;
1612         }
1613
1614         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1615         if (ret)
1616                 return ret;
1617
1618         ieee80211_do_stop(sdata, false);
1619
1620         ieee80211_teardown_sdata(sdata);
1621
1622         ret = drv_change_interface(local, sdata, internal_type, p2p);
1623         if (ret)
1624                 type = ieee80211_vif_type_p2p(&sdata->vif);
1625
1626         /*
1627          * Ignore return value here, there's not much we can do since
1628          * the driver changed the interface type internally already.
1629          * The warnings will hopefully make driver authors fix it :-)
1630          */
1631         ieee80211_check_queues(sdata, type);
1632
1633         ieee80211_setup_sdata(sdata, type);
1634
1635         err = ieee80211_do_open(&sdata->wdev, false);
1636         WARN(err, "type change: do_open returned %d", err);
1637
1638         return ret;
1639 }
1640
1641 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1642                              enum nl80211_iftype type)
1643 {
1644         int ret;
1645
1646         ASSERT_RTNL();
1647
1648         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1649                 return 0;
1650
1651         if (ieee80211_sdata_running(sdata)) {
1652                 ret = ieee80211_runtime_change_iftype(sdata, type);
1653                 if (ret)
1654                         return ret;
1655         } else {
1656                 /* Purge and reset type-dependent state. */
1657                 ieee80211_teardown_sdata(sdata);
1658                 ieee80211_setup_sdata(sdata, type);
1659         }
1660
1661         /* reset some values that shouldn't be kept across type changes */
1662         if (type == NL80211_IFTYPE_STATION)
1663                 sdata->u.mgd.use_4addr = false;
1664
1665         return 0;
1666 }
1667
1668 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1669                                        u8 *perm_addr, enum nl80211_iftype type)
1670 {
1671         struct ieee80211_sub_if_data *sdata;
1672         u64 mask, start, addr, val, inc;
1673         u8 *m;
1674         u8 tmp_addr[ETH_ALEN];
1675         int i;
1676
1677         /* default ... something at least */
1678         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1679
1680         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1681             local->hw.wiphy->n_addresses <= 1)
1682                 return;
1683
1684         mutex_lock(&local->iflist_mtx);
1685
1686         switch (type) {
1687         case NL80211_IFTYPE_MONITOR:
1688                 /* doesn't matter */
1689                 break;
1690         case NL80211_IFTYPE_WDS:
1691         case NL80211_IFTYPE_AP_VLAN:
1692                 /* match up with an AP interface */
1693                 list_for_each_entry(sdata, &local->interfaces, list) {
1694                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1695                                 continue;
1696                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1697                         break;
1698                 }
1699                 /* keep default if no AP interface present */
1700                 break;
1701         case NL80211_IFTYPE_P2P_CLIENT:
1702         case NL80211_IFTYPE_P2P_GO:
1703                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1704                         list_for_each_entry(sdata, &local->interfaces, list) {
1705                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1706                                         continue;
1707                                 if (!ieee80211_sdata_running(sdata))
1708                                         continue;
1709                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1710                                 goto out_unlock;
1711                         }
1712                 }
1713                 fallthrough;
1714         default:
1715                 /* assign a new address if possible -- try n_addresses first */
1716                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1717                         bool used = false;
1718
1719                         list_for_each_entry(sdata, &local->interfaces, list) {
1720                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1721                                                      sdata->vif.addr)) {
1722                                         used = true;
1723                                         break;
1724                                 }
1725                         }
1726
1727                         if (!used) {
1728                                 memcpy(perm_addr,
1729                                        local->hw.wiphy->addresses[i].addr,
1730                                        ETH_ALEN);
1731                                 break;
1732                         }
1733                 }
1734
1735                 /* try mask if available */
1736                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1737                         break;
1738
1739                 m = local->hw.wiphy->addr_mask;
1740                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1741                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1742                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1743
1744                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1745                         /* not a contiguous mask ... not handled now! */
1746                         pr_info("not contiguous\n");
1747                         break;
1748                 }
1749
1750                 /*
1751                  * Pick address of existing interface in case user changed
1752                  * MAC address manually, default to perm_addr.
1753                  */
1754                 m = local->hw.wiphy->perm_addr;
1755                 list_for_each_entry(sdata, &local->interfaces, list) {
1756                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1757                                 continue;
1758                         m = sdata->vif.addr;
1759                         break;
1760                 }
1761                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1762                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1763                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1764
1765                 inc = 1ULL<<__ffs64(mask);
1766                 val = (start & mask);
1767                 addr = (start & ~mask) | (val & mask);
1768                 do {
1769                         bool used = false;
1770
1771                         tmp_addr[5] = addr >> 0*8;
1772                         tmp_addr[4] = addr >> 1*8;
1773                         tmp_addr[3] = addr >> 2*8;
1774                         tmp_addr[2] = addr >> 3*8;
1775                         tmp_addr[1] = addr >> 4*8;
1776                         tmp_addr[0] = addr >> 5*8;
1777
1778                         val += inc;
1779
1780                         list_for_each_entry(sdata, &local->interfaces, list) {
1781                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1782                                         used = true;
1783                                         break;
1784                                 }
1785                         }
1786
1787                         if (!used) {
1788                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1789                                 break;
1790                         }
1791                         addr = (start & ~mask) | (val & mask);
1792                 } while (addr != start);
1793
1794                 break;
1795         }
1796
1797  out_unlock:
1798         mutex_unlock(&local->iflist_mtx);
1799 }
1800
1801 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1802                      unsigned char name_assign_type,
1803                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1804                      struct vif_params *params)
1805 {
1806         struct net_device *ndev = NULL;
1807         struct ieee80211_sub_if_data *sdata = NULL;
1808         struct txq_info *txqi;
1809         void (*if_setup)(struct net_device *dev);
1810         int ret, i;
1811         int txqs = 1;
1812
1813         ASSERT_RTNL();
1814
1815         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1816                 struct wireless_dev *wdev;
1817
1818                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1819                                 GFP_KERNEL);
1820                 if (!sdata)
1821                         return -ENOMEM;
1822                 wdev = &sdata->wdev;
1823
1824                 sdata->dev = NULL;
1825                 strlcpy(sdata->name, name, IFNAMSIZ);
1826                 ieee80211_assign_perm_addr(local, wdev->address, type);
1827                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1828         } else {
1829                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1830                                  sizeof(void *));
1831                 int txq_size = 0;
1832
1833                 if (local->ops->wake_tx_queue &&
1834                     type != NL80211_IFTYPE_AP_VLAN &&
1835                     (type != NL80211_IFTYPE_MONITOR ||
1836                      (params->flags & MONITOR_FLAG_ACTIVE)))
1837                         txq_size += sizeof(struct txq_info) +
1838                                     local->hw.txq_data_size;
1839
1840                 if (local->ops->wake_tx_queue) {
1841                         if_setup = ieee80211_if_setup_no_queue;
1842                 } else {
1843                         if_setup = ieee80211_if_setup;
1844                         if (local->hw.queues >= IEEE80211_NUM_ACS)
1845                                 txqs = IEEE80211_NUM_ACS;
1846                 }
1847
1848                 ndev = alloc_netdev_mqs(size + txq_size,
1849                                         name, name_assign_type,
1850                                         if_setup, txqs, 1);
1851                 if (!ndev)
1852                         return -ENOMEM;
1853
1854                 if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len)
1855                         ndev->tx_queue_len = local->hw.wiphy->tx_queue_len;
1856
1857                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1858
1859                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1860                 if (!ndev->tstats) {
1861                         free_netdev(ndev);
1862                         return -ENOMEM;
1863                 }
1864
1865                 ndev->needed_headroom = local->tx_headroom +
1866                                         4*6 /* four MAC addresses */
1867                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1868                                         + 6 /* mesh */
1869                                         + 8 /* rfc1042/bridge tunnel */
1870                                         - ETH_HLEN /* ethernet hard_header_len */
1871                                         + IEEE80211_ENCRYPT_HEADROOM;
1872                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1873
1874                 ret = dev_alloc_name(ndev, ndev->name);
1875                 if (ret < 0) {
1876                         ieee80211_if_free(ndev);
1877                         free_netdev(ndev);
1878                         return ret;
1879                 }
1880
1881                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1882                 if (is_valid_ether_addr(params->macaddr))
1883                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1884                 else
1885                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1886                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1887
1888                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1889                 sdata = netdev_priv(ndev);
1890                 ndev->ieee80211_ptr = &sdata->wdev;
1891                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1892                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1893
1894                 if (txq_size) {
1895                         txqi = netdev_priv(ndev) + size;
1896                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1897                 }
1898
1899                 sdata->dev = ndev;
1900         }
1901
1902         /* initialise type-independent data */
1903         sdata->wdev.wiphy = local->hw.wiphy;
1904         sdata->local = local;
1905
1906         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1907                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1908
1909         INIT_LIST_HEAD(&sdata->key_list);
1910
1911         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1912                           ieee80211_dfs_cac_timer_work);
1913         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1914                           ieee80211_delayed_tailroom_dec);
1915
1916         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1917                 struct ieee80211_supported_band *sband;
1918                 sband = local->hw.wiphy->bands[i];
1919                 sdata->rc_rateidx_mask[i] =
1920                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1921                 if (sband) {
1922                         __le16 cap;
1923                         u16 *vht_rate_mask;
1924
1925                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1926                                sband->ht_cap.mcs.rx_mask,
1927                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1928
1929                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1930                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1931                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1932                 } else {
1933                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1934                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1935                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1936                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1937                 }
1938         }
1939
1940         ieee80211_set_default_queues(sdata);
1941
1942         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1943         sdata->user_power_level = local->user_power_level;
1944
1945         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1946
1947         /* setup type-dependent data */
1948         ieee80211_setup_sdata(sdata, type);
1949
1950         if (ndev) {
1951                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1952                 if (type == NL80211_IFTYPE_STATION)
1953                         sdata->u.mgd.use_4addr = params->use_4addr;
1954
1955                 ndev->features |= local->hw.netdev_features;
1956                 ndev->hw_features |= ndev->features &
1957                                         MAC80211_SUPPORTED_FEATURES_TX;
1958
1959                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1960
1961                 /* MTU range: 256 - 2304 */
1962                 ndev->min_mtu = 256;
1963                 ndev->max_mtu = local->hw.max_mtu;
1964
1965                 ret = register_netdevice(ndev);
1966                 if (ret) {
1967                         free_netdev(ndev);
1968                         return ret;
1969                 }
1970         }
1971
1972         mutex_lock(&local->iflist_mtx);
1973         list_add_tail_rcu(&sdata->list, &local->interfaces);
1974         mutex_unlock(&local->iflist_mtx);
1975
1976         if (new_wdev)
1977                 *new_wdev = &sdata->wdev;
1978
1979         return 0;
1980 }
1981
1982 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1983 {
1984         ASSERT_RTNL();
1985
1986         mutex_lock(&sdata->local->iflist_mtx);
1987         list_del_rcu(&sdata->list);
1988         mutex_unlock(&sdata->local->iflist_mtx);
1989
1990         if (sdata->vif.txq)
1991                 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
1992
1993         synchronize_rcu();
1994
1995         if (sdata->dev) {
1996                 unregister_netdevice(sdata->dev);
1997         } else {
1998                 cfg80211_unregister_wdev(&sdata->wdev);
1999                 ieee80211_teardown_sdata(sdata);
2000                 kfree(sdata);
2001         }
2002 }
2003
2004 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2005 {
2006         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2007                 return;
2008         ieee80211_do_stop(sdata, true);
2009 }
2010
2011 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2012 {
2013         struct ieee80211_sub_if_data *sdata, *tmp;
2014         LIST_HEAD(unreg_list);
2015         LIST_HEAD(wdev_list);
2016
2017         ASSERT_RTNL();
2018
2019         /* Before destroying the interfaces, make sure they're all stopped so
2020          * that the hardware is stopped. Otherwise, the driver might still be
2021          * iterating the interfaces during the shutdown, e.g. from a worker
2022          * or from RX processing or similar, and if it does so (using atomic
2023          * iteration) while we're manipulating the list, the iteration will
2024          * crash.
2025          *
2026          * After this, the hardware should be stopped and the driver should
2027          * have stopped all of its activities, so that we can do RCU-unaware
2028          * manipulations of the interface list below.
2029          */
2030         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2031
2032         WARN(local->open_count, "%s: open count remains %d\n",
2033              wiphy_name(local->hw.wiphy), local->open_count);
2034
2035         ieee80211_txq_teardown_flows(local);
2036
2037         mutex_lock(&local->iflist_mtx);
2038         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
2039                 list_del(&sdata->list);
2040
2041                 if (sdata->dev)
2042                         unregister_netdevice_queue(sdata->dev, &unreg_list);
2043                 else
2044                         list_add(&sdata->list, &wdev_list);
2045         }
2046         mutex_unlock(&local->iflist_mtx);
2047         unregister_netdevice_many(&unreg_list);
2048
2049         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2050                 list_del(&sdata->list);
2051                 cfg80211_unregister_wdev(&sdata->wdev);
2052                 kfree(sdata);
2053         }
2054 }
2055
2056 static int netdev_notify(struct notifier_block *nb,
2057                          unsigned long state, void *ptr)
2058 {
2059         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2060         struct ieee80211_sub_if_data *sdata;
2061
2062         if (state != NETDEV_CHANGENAME)
2063                 return NOTIFY_DONE;
2064
2065         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2066                 return NOTIFY_DONE;
2067
2068         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2069                 return NOTIFY_DONE;
2070
2071         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2072         memcpy(sdata->name, dev->name, IFNAMSIZ);
2073         ieee80211_debugfs_rename_netdev(sdata);
2074
2075         return NOTIFY_OK;
2076 }
2077
2078 static struct notifier_block mac80211_netdev_notifier = {
2079         .notifier_call = netdev_notify,
2080 };
2081
2082 int ieee80211_iface_init(void)
2083 {
2084         return register_netdevice_notifier(&mac80211_netdev_notifier);
2085 }
2086
2087 void ieee80211_iface_exit(void)
2088 {
2089         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2090 }
2091
2092 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2093 {
2094         if (sdata->vif.type == NL80211_IFTYPE_AP)
2095                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2096         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2097                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2098 }
2099
2100 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2101 {
2102         if (sdata->vif.type == NL80211_IFTYPE_AP)
2103                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2104         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2105                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2106 }