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) 2018-2023 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 <linux/kcov.h>
  19 #include <net/mac80211.h>
  20 #include <net/ieee80211_radiotap.h>
  21 #include "ieee80211_i.h"
  22 #include "sta_info.h"
  23 #include "debugfs_netdev.h"
  24 #include "mesh.h"
  25 #include "led.h"
  26 #include "driver-ops.h"
  27 #include "wme.h"
  28 #include "rate.h"
  29
  30 /**
  31  * DOC: Interface list locking
  32  *
  33  * The interface list in each struct ieee80211_local is protected
  34  * three-fold:
  35  *
  36  * (1) modifications may only be done under the RTNL *and* wiphy mutex
  37  *     *and* iflist_mtx
  38  * (2) 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 wiphy mutex, the iflist_mtx or RCU.
  43  */
  44
  45 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *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.bss_conf.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->deflink.user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  63                 power = min(power, sdata->deflink.user_power_level);
  64
  65         if (sdata->deflink.ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  66                 power = min(power, sdata->deflink.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_link_info_change_notify(sdata, &sdata->deflink,
  83                                                   BSS_CHANGED_TXPOWER);
  84 }
  85
  86 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
  87 {
  88         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  89                 return 0;
  90
  91         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  92         return IEEE80211_CONF_CHANGE_IDLE;
  93 }
  94
  95 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  96 {
  97         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  98                 return 0;
  99
 100         ieee80211_flush_queues(local, NULL, false);
 101
 102         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 103         return IEEE80211_CONF_CHANGE_IDLE;
 104 }
 105
 106 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
 107                                    bool force_active)
 108 {
 109         bool working, scanning, active;
 110         unsigned int led_trig_start = 0, led_trig_stop = 0;
 111
 112         lockdep_assert_wiphy(local->hw.wiphy);
 113
 114         active = force_active ||
 115                  !list_empty(&local->chanctx_list) ||
 116                  local->monitors;
 117
 118         working = !local->ops->remain_on_channel &&
 119                   !list_empty(&local->roc_list);
 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_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 154                                 bool check_dup)
 155 {
 156         struct ieee80211_local *local = sdata->local;
 157         struct ieee80211_sub_if_data *iter;
 158         u64 new, mask, tmp;
 159         u8 *m;
 160         int ret = 0;
 161
 162         lockdep_assert_wiphy(local->hw.wiphy);
 163
 164         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 165                 return 0;
 166
 167         m = addr;
 168         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 169                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 170                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 171
 172         m = local->hw.wiphy->addr_mask;
 173         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 174                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 175                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 176
 177         if (!check_dup)
 178                 return ret;
 179
 180         list_for_each_entry(iter, &local->interfaces, list) {
 181                 if (iter == sdata)
 182                         continue;
 183
 184                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 185                     !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 186                         continue;
 187
 188                 m = iter->vif.addr;
 189                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 190                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 191                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 192
 193                 if ((new & ~mask) != (tmp & ~mask)) {
 194                         ret = -EINVAL;
 195                         break;
 196                 }
 197         }
 198
 199         return ret;
 200 }
 201
 202 static int ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data *sdata)
 203 {
 204         struct ieee80211_roc_work *roc;
 205         struct ieee80211_local *local = sdata->local;
 206         struct ieee80211_sub_if_data *scan_sdata;
 207         int ret = 0;
 208
 209         lockdep_assert_wiphy(local->hw.wiphy);
 210
 211         /* To be the most flexible here we want to only limit changing the
 212          * address if the specific interface is doing offchannel work or
 213          * scanning.
 214          */
 215         if (netif_carrier_ok(sdata->dev))
 216                 return -EBUSY;
 217
 218         /* First check no ROC work is happening on this iface */
 219         list_for_each_entry(roc, &local->roc_list, list) {
 220                 if (roc->sdata != sdata)
 221                         continue;
 222
 223                 if (roc->started) {
 224                         ret = -EBUSY;
 225                         goto unlock;
 226                 }
 227         }
 228
 229         /* And if this iface is scanning */
 230         if (local->scanning) {
 231                 scan_sdata = rcu_dereference_protected(local->scan_sdata,
 232                                                        lockdep_is_held(&local->hw.wiphy->mtx));
 233                 if (sdata == scan_sdata)
 234                         ret = -EBUSY;
 235         }
 236
 237         switch (sdata->vif.type) {
 238         case NL80211_IFTYPE_STATION:
 239         case NL80211_IFTYPE_P2P_CLIENT:
 240                 /* More interface types could be added here but changing the
 241                  * address while powered makes the most sense in client modes.
 242                  */
 243                 break;
 244         default:
 245                 ret = -EOPNOTSUPP;
 246         }
 247
 248 unlock:
 249         return ret;
 250 }
 251
 252 static int _ieee80211_change_mac(struct ieee80211_sub_if_data *sdata,
 253                                  void *addr)
 254 {
 255         struct ieee80211_local *local = sdata->local;
 256         struct sockaddr *sa = addr;
 257         bool check_dup = true;
 258         bool live = false;
 259         int ret;
 260
 261         if (ieee80211_sdata_running(sdata)) {
 262                 ret = ieee80211_can_powered_addr_change(sdata);
 263                 if (ret)
 264                         return ret;
 265
 266                 live = true;
 267         }
 268
 269         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 270             !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 271                 check_dup = false;
 272
 273         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 274         if (ret)
 275                 return ret;
 276
 277         if (live)
 278                 drv_remove_interface(local, sdata);
 279         ret = eth_mac_addr(sdata->dev, sa);
 280
 281         if (ret == 0) {
 282                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 283                 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
 284         }
 285
 286         /* Regardless of eth_mac_addr() return we still want to add the
 287          * interface back. This should not fail...
 288          */
 289         if (live)
 290                 WARN_ON(drv_add_interface(local, sdata));
 291
 292         return ret;
 293 }
 294
 295 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 296 {
 297         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 298         struct ieee80211_local *local = sdata->local;
 299         int ret;
 300
 301         /*
 302          * This happens during unregistration if there's a bond device
 303          * active (maybe other cases?) and we must get removed from it.
 304          * But we really don't care anymore if it's not registered now.
 305          */
 306         if (!dev->ieee80211_ptr->registered)
 307                 return 0;
 308
 309         wiphy_lock(local->hw.wiphy);
 310         ret = _ieee80211_change_mac(sdata, addr);
 311         wiphy_unlock(local->hw.wiphy);
 312
 313         return ret;
 314 }
 315
 316 static inline int identical_mac_addr_allowed(int type1, int type2)
 317 {
 318         return type1 == NL80211_IFTYPE_MONITOR ||
 319                 type2 == NL80211_IFTYPE_MONITOR ||
 320                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 321                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 322                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 323                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 324                         (type2 == NL80211_IFTYPE_AP ||
 325                          type2 == NL80211_IFTYPE_AP_VLAN));
 326 }
 327
 328 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 329                                             enum nl80211_iftype iftype)
 330 {
 331         struct ieee80211_local *local = sdata->local;
 332         struct ieee80211_sub_if_data *nsdata;
 333
 334         ASSERT_RTNL();
 335         lockdep_assert_wiphy(local->hw.wiphy);
 336
 337         /* we hold the RTNL here so can safely walk the list */
 338         list_for_each_entry(nsdata, &local->interfaces, list) {
 339                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 340                         /*
 341                          * Only OCB and monitor mode may coexist
 342                          */
 343                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
 344                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
 345                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 346                              nsdata->vif.type == NL80211_IFTYPE_OCB))
 347                                 return -EBUSY;
 348
 349                         /*
 350                          * Allow only a single IBSS interface to be up at any
 351                          * time. This is restricted because beacon distribution
 352                          * cannot work properly if both are in the same IBSS.
 353                          *
 354                          * To remove this restriction we'd have to disallow them
 355                          * from setting the same SSID on different IBSS interfaces
 356                          * belonging to the same hardware. Then, however, we're
 357                          * faced with having to adopt two different TSF timers...
 358                          */
 359                         if (iftype == NL80211_IFTYPE_ADHOC &&
 360                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 361                                 return -EBUSY;
 362                         /*
 363                          * will not add another interface while any channel
 364                          * switch is active.
 365                          */
 366                         if (nsdata->vif.bss_conf.csa_active)
 367                                 return -EBUSY;
 368
 369                         /*
 370                          * The remaining checks are only performed for interfaces
 371                          * with the same MAC address.
 372                          */
 373                         if (!ether_addr_equal(sdata->vif.addr,
 374                                               nsdata->vif.addr))
 375                                 continue;
 376
 377                         /*
 378                          * check whether it may have the same address
 379                          */
 380                         if (!identical_mac_addr_allowed(iftype,
 381                                                         nsdata->vif.type))
 382                                 return -ENOTUNIQ;
 383
 384                         /* No support for VLAN with MLO yet */
 385                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 386                             sdata->wdev.use_4addr &&
 387                             nsdata->vif.type == NL80211_IFTYPE_AP &&
 388                             nsdata->vif.valid_links)
 389                                 return -EOPNOTSUPP;
 390
 391                         /*
 392                          * can only add VLANs to enabled APs
 393                          */
 394                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 395                             nsdata->vif.type == NL80211_IFTYPE_AP)
 396                                 sdata->bss = &nsdata->u.ap;
 397                 }
 398         }
 399
 400         return ieee80211_check_combinations(sdata, NULL, 0, 0);
 401 }
 402
 403 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 404                                   enum nl80211_iftype iftype)
 405 {
 406         int n_queues = sdata->local->hw.queues;
 407         int i;
 408
 409         if (iftype == NL80211_IFTYPE_NAN)
 410                 return 0;
 411
 412         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 413                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 414                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 415                                          IEEE80211_INVAL_HW_QUEUE))
 416                                 return -EINVAL;
 417                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 418                                          n_queues))
 419                                 return -EINVAL;
 420                 }
 421         }
 422
 423         if ((iftype != NL80211_IFTYPE_AP &&
 424              iftype != NL80211_IFTYPE_P2P_GO &&
 425              iftype != NL80211_IFTYPE_MESH_POINT) ||
 426             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
 427                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 428                 return 0;
 429         }
 430
 431         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 432                 return -EINVAL;
 433
 434         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 435                 return -EINVAL;
 436
 437         return 0;
 438 }
 439
 440 static int ieee80211_open(struct net_device *dev)
 441 {
 442         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 443         int err;
 444
 445         /* fail early if user set an invalid address */
 446         if (!is_valid_ether_addr(dev->dev_addr))
 447                 return -EADDRNOTAVAIL;
 448
 449         wiphy_lock(sdata->local->hw.wiphy);
 450         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 451         if (err)
 452                 goto out;
 453
 454         err = ieee80211_do_open(&sdata->wdev, true);
 455 out:
 456         wiphy_unlock(sdata->local->hw.wiphy);
 457
 458         return err;
 459 }
 460
 461 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down)
 462 {
 463         struct ieee80211_local *local = sdata->local;
 464         unsigned long flags;
 465         struct sk_buff *skb, *tmp;
 466         u32 hw_reconf_flags = 0;
 467         int i, flushed;
 468         struct ps_data *ps;
 469         struct cfg80211_chan_def chandef;
 470         bool cancel_scan;
 471         struct cfg80211_nan_func *func;
 472
 473         lockdep_assert_wiphy(local->hw.wiphy);
 474
 475         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 476         synchronize_rcu(); /* flush _ieee80211_wake_txqs() */
 477
 478         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 479         if (cancel_scan)
 480                 ieee80211_scan_cancel(local);
 481
 482         ieee80211_roc_purge(local, sdata);
 483
 484         switch (sdata->vif.type) {
 485         case NL80211_IFTYPE_STATION:
 486                 ieee80211_mgd_stop(sdata);
 487                 break;
 488         case NL80211_IFTYPE_ADHOC:
 489                 ieee80211_ibss_stop(sdata);
 490                 break;
 491         case NL80211_IFTYPE_MONITOR:
 492                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
 493                         break;
 494                 list_del_rcu(&sdata->u.mntr.list);
 495                 break;
 496         default:
 497                 break;
 498         }
 499
 500         /*
 501          * Remove all stations associated with this interface.
 502          *
 503          * This must be done before calling ops->remove_interface()
 504          * because otherwise we can later invoke ops->sta_notify()
 505          * whenever the STAs are removed, and that invalidates driver
 506          * assumptions about always getting a vif pointer that is valid
 507          * (because if we remove a STA after ops->remove_interface()
 508          * the driver will have removed the vif info already!)
 509          *
 510          * For AP_VLANs stations may exist since there's nothing else that
 511          * would have removed them, but in other modes there shouldn't
 512          * be any stations.
 513          */
 514         flushed = sta_info_flush(sdata);
 515         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0);
 516
 517         /* don't count this interface for allmulti while it is down */
 518         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 519                 atomic_dec(&local->iff_allmultis);
 520
 521         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 522                 local->fif_pspoll--;
 523                 local->fif_probe_req--;
 524         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 525                 local->fif_probe_req--;
 526         }
 527
 528         if (sdata->dev) {
 529                 netif_addr_lock_bh(sdata->dev);
 530                 spin_lock_bh(&local->filter_lock);
 531                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 532                                  sdata->dev->addr_len);
 533                 spin_unlock_bh(&local->filter_lock);
 534                 netif_addr_unlock_bh(sdata->dev);
 535         }
 536
 537         del_timer_sync(&local->dynamic_ps_timer);
 538         wiphy_work_cancel(local->hw.wiphy, &local->dynamic_ps_enable_work);
 539
 540         WARN(ieee80211_vif_is_mld(&sdata->vif),
 541              "destroying interface with valid links 0x%04x\n",
 542              sdata->vif.valid_links);
 543
 544         sdata->vif.bss_conf.csa_active = false;
 545         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 546                 sdata->deflink.u.mgd.csa_waiting_bcn = false;
 547         if (sdata->deflink.csa_block_tx) {
 548                 ieee80211_wake_vif_queues(local, sdata,
 549                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 550                 sdata->deflink.csa_block_tx = false;
 551         }
 552
 553         wiphy_work_cancel(local->hw.wiphy, &sdata->deflink.csa_finalize_work);
 554         wiphy_work_cancel(local->hw.wiphy,
 555                           &sdata->deflink.color_change_finalize_work);
 556         wiphy_delayed_work_cancel(local->hw.wiphy,
 557                                   &sdata->deflink.dfs_cac_timer_work);
 558
 559         if (sdata->wdev.cac_started) {
 560                 chandef = sdata->vif.bss_conf.chandef;
 561                 WARN_ON(local->suspended);
 562                 ieee80211_link_release_channel(&sdata->deflink);
 563                 cfg80211_cac_event(sdata->dev, &chandef,
 564                                    NL80211_RADAR_CAC_ABORTED,
 565                                    GFP_KERNEL);
 566         }
 567
 568         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 569                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 570         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 571                 /* remove all packets in parent bc_buf pointing to this dev */
 572                 ps = &sdata->bss->ps;
 573
 574                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 575                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 576                         if (skb->dev == sdata->dev) {
 577                                 __skb_unlink(skb, &ps->bc_buf);
 578                                 local->total_ps_buffered--;
 579                                 ieee80211_free_txskb(&local->hw, skb);
 580                         }
 581                 }
 582                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 583         }
 584
 585         if (going_down)
 586                 local->open_count--;
 587
 588         switch (sdata->vif.type) {
 589         case NL80211_IFTYPE_AP_VLAN:
 590                 list_del(&sdata->u.vlan.list);
 591                 RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL);
 592                 /* see comment in the default case below */
 593                 ieee80211_free_keys(sdata, true);
 594                 /* no need to tell driver */
 595                 break;
 596         case NL80211_IFTYPE_MONITOR:
 597                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 598                         local->cooked_mntrs--;
 599                         break;
 600                 }
 601
 602                 local->monitors--;
 603                 if (local->monitors == 0) {
 604                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 605                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 606                 }
 607
 608                 ieee80211_adjust_monitor_flags(sdata, -1);
 609                 break;
 610         case NL80211_IFTYPE_NAN:
 611                 /* clean all the functions */
 612                 spin_lock_bh(&sdata->u.nan.func_lock);
 613
 614                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
 615                         idr_remove(&sdata->u.nan.function_inst_ids, i);
 616                         cfg80211_free_nan_func(func);
 617                 }
 618                 idr_destroy(&sdata->u.nan.function_inst_ids);
 619
 620                 spin_unlock_bh(&sdata->u.nan.func_lock);
 621                 break;
 622         case NL80211_IFTYPE_P2P_DEVICE:
 623                 /* relies on synchronize_rcu() below */
 624                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 625                 fallthrough;
 626         default:
 627                 wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->work);
 628                 /*
 629                  * When we get here, the interface is marked down.
 630                  * Free the remaining keys, if there are any
 631                  * (which can happen in AP mode if userspace sets
 632                  * keys before the interface is operating)
 633                  *
 634                  * Force the key freeing to always synchronize_net()
 635                  * to wait for the RX path in case it is using this
 636                  * interface enqueuing frames at this very time on
 637                  * another CPU.
 638                  */
 639                 ieee80211_free_keys(sdata, true);
 640                 skb_queue_purge(&sdata->skb_queue);
 641                 skb_queue_purge(&sdata->status_queue);
 642         }
 643
 644         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 645         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 646                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 647                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 648                         if (info->control.vif == &sdata->vif) {
 649                                 __skb_unlink(skb, &local->pending[i]);
 650                                 ieee80211_free_txskb(&local->hw, skb);
 651                         }
 652                 }
 653         }
 654         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 655
 656         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 657                 ieee80211_txq_remove_vlan(local, sdata);
 658
 659         sdata->bss = NULL;
 660
 661         if (local->open_count == 0)
 662                 ieee80211_clear_tx_pending(local);
 663
 664         sdata->vif.bss_conf.beacon_int = 0;
 665
 666         /*
 667          * If the interface goes down while suspended, presumably because
 668          * the device was unplugged and that happens before our resume,
 669          * then the driver is already unconfigured and the remainder of
 670          * this function isn't needed.
 671          * XXX: what about WoWLAN? If the device has software state, e.g.
 672          *      memory allocated, it might expect teardown commands from
 673          *      mac80211 here?
 674          */
 675         if (local->suspended) {
 676                 WARN_ON(local->wowlan);
 677                 WARN_ON(rcu_access_pointer(local->monitor_sdata));
 678                 return;
 679         }
 680
 681         switch (sdata->vif.type) {
 682         case NL80211_IFTYPE_AP_VLAN:
 683                 break;
 684         case NL80211_IFTYPE_MONITOR:
 685                 if (local->monitors == 0)
 686                         ieee80211_del_virtual_monitor(local);
 687
 688                 ieee80211_recalc_idle(local);
 689
 690                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 691                         break;
 692
 693                 fallthrough;
 694         default:
 695                 if (going_down)
 696                         drv_remove_interface(local, sdata);
 697         }
 698
 699         ieee80211_recalc_ps(local);
 700
 701         if (cancel_scan)
 702                 wiphy_delayed_work_flush(local->hw.wiphy, &local->scan_work);
 703
 704         if (local->open_count == 0) {
 705                 ieee80211_stop_device(local);
 706
 707                 /* no reconfiguring after stop! */
 708                 return;
 709         }
 710
 711         /* do after stop to avoid reconfiguring when we stop anyway */
 712         ieee80211_configure_filter(local);
 713         ieee80211_hw_config(local, hw_reconf_flags);
 714
 715         if (local->monitors == local->open_count)
 716                 ieee80211_add_virtual_monitor(local);
 717 }
 718
 719 static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata)
 720 {
 721         struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata;
 722         struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif;
 723
 724         if (!tx_vif)
 725                 return;
 726
 727         tx_sdata = vif_to_sdata(tx_vif);
 728         sdata->vif.mbssid_tx_vif = NULL;
 729
 730         list_for_each_entry_safe(non_tx_sdata, tmp_sdata,
 731                                  &tx_sdata->local->interfaces, list) {
 732                 if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata &&
 733                     non_tx_sdata->vif.mbssid_tx_vif == tx_vif &&
 734                     ieee80211_sdata_running(non_tx_sdata)) {
 735                         non_tx_sdata->vif.mbssid_tx_vif = NULL;
 736                         dev_close(non_tx_sdata->wdev.netdev);
 737                 }
 738         }
 739
 740         if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) {
 741                 tx_sdata->vif.mbssid_tx_vif = NULL;
 742                 dev_close(tx_sdata->wdev.netdev);
 743         }
 744 }
 745
 746 static int ieee80211_stop(struct net_device *dev)
 747 {
 748         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 749
 750         /* close dependent VLAN and MBSSID interfaces before locking wiphy */
 751         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 752                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 753
 754                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 755                                          u.vlan.list)
 756                         dev_close(vlan->dev);
 757
 758                 ieee80211_stop_mbssid(sdata);
 759         }
 760
 761         wiphy_lock(sdata->local->hw.wiphy);
 762         wiphy_work_cancel(sdata->local->hw.wiphy, &sdata->activate_links_work);
 763
 764         ieee80211_do_stop(sdata, true);
 765         wiphy_unlock(sdata->local->hw.wiphy);
 766
 767         return 0;
 768 }
 769
 770 static void ieee80211_set_multicast_list(struct net_device *dev)
 771 {
 772         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 773         struct ieee80211_local *local = sdata->local;
 774         int allmulti, sdata_allmulti;
 775
 776         allmulti = !!(dev->flags & IFF_ALLMULTI);
 777         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 778
 779         if (allmulti != sdata_allmulti) {
 780                 if (dev->flags & IFF_ALLMULTI)
 781                         atomic_inc(&local->iff_allmultis);
 782                 else
 783                         atomic_dec(&local->iff_allmultis);
 784                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 785         }
 786
 787         spin_lock_bh(&local->filter_lock);
 788         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 789         spin_unlock_bh(&local->filter_lock);
 790         wiphy_work_queue(local->hw.wiphy, &local->reconfig_filter);
 791 }
 792
 793 /*
 794  * Called when the netdev is removed or, by the code below, before
 795  * the interface type changes.
 796  */
 797 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 798 {
 799         /* free extra data */
 800         ieee80211_free_keys(sdata, false);
 801
 802         ieee80211_debugfs_remove_netdev(sdata);
 803
 804         ieee80211_destroy_frag_cache(&sdata->frags);
 805
 806         if (ieee80211_vif_is_mesh(&sdata->vif))
 807                 ieee80211_mesh_teardown_sdata(sdata);
 808
 809         ieee80211_vif_clear_links(sdata);
 810         ieee80211_link_stop(&sdata->deflink);
 811 }
 812
 813 static void ieee80211_uninit(struct net_device *dev)
 814 {
 815         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
 816 }
 817
 818 static void
 819 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 820 {
 821         dev_fetch_sw_netstats(stats, dev->tstats);
 822 }
 823
 824 static int ieee80211_netdev_setup_tc(struct net_device *dev,
 825                                      enum tc_setup_type type, void *type_data)
 826 {
 827         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 828         struct ieee80211_local *local = sdata->local;
 829
 830         return drv_net_setup_tc(local, sdata, dev, type, type_data);
 831 }
 832
 833 static const struct net_device_ops ieee80211_dataif_ops = {
 834         .ndo_open               = ieee80211_open,
 835         .ndo_stop               = ieee80211_stop,
 836         .ndo_uninit             = ieee80211_uninit,
 837         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 838         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 839         .ndo_set_mac_address    = ieee80211_change_mac,
 840         .ndo_get_stats64        = ieee80211_get_stats64,
 841         .ndo_setup_tc           = ieee80211_netdev_setup_tc,
 842 };
 843
 844 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 845                                           struct sk_buff *skb,
 846                                           struct net_device *sb_dev)
 847 {
 848         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 849         struct ieee80211_local *local = sdata->local;
 850         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 851         struct ieee80211_hdr *hdr;
 852         int len_rthdr;
 853
 854         if (local->hw.queues < IEEE80211_NUM_ACS)
 855                 return 0;
 856
 857         /* reset flags and info before parsing radiotap header */
 858         memset(info, 0, sizeof(*info));
 859
 860         if (!ieee80211_parse_tx_radiotap(skb, dev))
 861                 return 0; /* doesn't matter, frame will be dropped */
 862
 863         len_rthdr = ieee80211_get_radiotap_len(skb->data);
 864         hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
 865         if (skb->len < len_rthdr + 2 ||
 866             skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
 867                 return 0; /* doesn't matter, frame will be dropped */
 868
 869         return ieee80211_select_queue_80211(sdata, skb, hdr);
 870 }
 871
 872 static const struct net_device_ops ieee80211_monitorif_ops = {
 873         .ndo_open               = ieee80211_open,
 874         .ndo_stop               = ieee80211_stop,
 875         .ndo_uninit             = ieee80211_uninit,
 876         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 877         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 878         .ndo_set_mac_address    = ieee80211_change_mac,
 879         .ndo_select_queue       = ieee80211_monitor_select_queue,
 880         .ndo_get_stats64        = ieee80211_get_stats64,
 881 };
 882
 883 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx,
 884                                               struct net_device_path *path)
 885 {
 886         struct ieee80211_sub_if_data *sdata;
 887         struct ieee80211_local *local;
 888         struct sta_info *sta;
 889         int ret = -ENOENT;
 890
 891         sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev);
 892         local = sdata->local;
 893
 894         if (!local->ops->net_fill_forward_path)
 895                 return -EOPNOTSUPP;
 896
 897         rcu_read_lock();
 898         switch (sdata->vif.type) {
 899         case NL80211_IFTYPE_AP_VLAN:
 900                 sta = rcu_dereference(sdata->u.vlan.sta);
 901                 if (sta)
 902                         break;
 903                 if (sdata->wdev.use_4addr)
 904                         goto out;
 905                 if (is_multicast_ether_addr(ctx->daddr))
 906                         goto out;
 907                 sta = sta_info_get_bss(sdata, ctx->daddr);
 908                 break;
 909         case NL80211_IFTYPE_AP:
 910                 if (is_multicast_ether_addr(ctx->daddr))
 911                         goto out;
 912                 sta = sta_info_get(sdata, ctx->daddr);
 913                 break;
 914         case NL80211_IFTYPE_STATION:
 915                 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
 916                         sta = sta_info_get(sdata, ctx->daddr);
 917                         if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
 918                                 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
 919                                         goto out;
 920
 921                                 break;
 922                         }
 923                 }
 924
 925                 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid);
 926                 break;
 927         default:
 928                 goto out;
 929         }
 930
 931         if (!sta)
 932                 goto out;
 933
 934         ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path);
 935 out:
 936         rcu_read_unlock();
 937
 938         return ret;
 939 }
 940
 941 static const struct net_device_ops ieee80211_dataif_8023_ops = {
 942         .ndo_open               = ieee80211_open,
 943         .ndo_stop               = ieee80211_stop,
 944         .ndo_uninit             = ieee80211_uninit,
 945         .ndo_start_xmit         = ieee80211_subif_start_xmit_8023,
 946         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 947         .ndo_set_mac_address    = ieee80211_change_mac,
 948         .ndo_get_stats64        = ieee80211_get_stats64,
 949         .ndo_fill_forward_path  = ieee80211_netdev_fill_forward_path,
 950         .ndo_setup_tc           = ieee80211_netdev_setup_tc,
 951 };
 952
 953 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)
 954 {
 955         switch (iftype) {
 956         /* P2P GO and client are mapped to AP/STATION types */
 957         case NL80211_IFTYPE_AP:
 958         case NL80211_IFTYPE_STATION:
 959                 return true;
 960         default:
 961                 return false;
 962         }
 963 }
 964
 965 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
 966 {
 967         struct ieee80211_local *local = sdata->local;
 968         u32 flags;
 969
 970         flags = sdata->vif.offload_flags;
 971
 972         if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
 973             ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
 974                 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
 975
 976                 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
 977                     local->hw.wiphy->frag_threshold != (u32)-1)
 978                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 979
 980                 if (local->monitors)
 981                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 982         } else {
 983                 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 984         }
 985
 986         if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) &&
 987             ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
 988                 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED;
 989
 990                 if (local->monitors &&
 991                     !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP))
 992                         flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
 993         } else {
 994                 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
 995         }
 996
 997         if (sdata->vif.offload_flags == flags)
 998                 return false;
 999
1000         sdata->vif.offload_flags = flags;
1001         ieee80211_check_fast_rx_iface(sdata);
1002         return true;
1003 }
1004
1005 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
1006 {
1007         struct ieee80211_local *local = sdata->local;
1008         struct ieee80211_sub_if_data *bss = sdata;
1009         bool enabled;
1010
1011         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1012                 if (!sdata->bss)
1013                         return;
1014
1015                 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1016         }
1017
1018         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
1019             !ieee80211_iftype_supports_hdr_offload(bss->vif.type))
1020                 return;
1021
1022         enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
1023         if (sdata->wdev.use_4addr &&
1024             !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
1025                 enabled = false;
1026
1027         sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
1028                                            &ieee80211_dataif_ops;
1029 }
1030
1031 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
1032 {
1033         struct ieee80211_local *local = sdata->local;
1034         struct ieee80211_sub_if_data *vsdata;
1035
1036         if (ieee80211_set_sdata_offload_flags(sdata)) {
1037                 drv_update_vif_offload(local, sdata);
1038                 ieee80211_set_vif_encap_ops(sdata);
1039         }
1040
1041         list_for_each_entry(vsdata, &local->interfaces, list) {
1042                 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
1043                     vsdata->bss != &sdata->u.ap)
1044                         continue;
1045
1046                 ieee80211_set_vif_encap_ops(vsdata);
1047         }
1048 }
1049
1050 void ieee80211_recalc_offload(struct ieee80211_local *local)
1051 {
1052         struct ieee80211_sub_if_data *sdata;
1053
1054         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
1055                 return;
1056
1057         lockdep_assert_wiphy(local->hw.wiphy);
1058
1059         list_for_each_entry(sdata, &local->interfaces, list) {
1060                 if (!ieee80211_sdata_running(sdata))
1061                         continue;
1062
1063                 ieee80211_recalc_sdata_offload(sdata);
1064         }
1065 }
1066
1067 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
1068                                     const int offset)
1069 {
1070         struct ieee80211_local *local = sdata->local;
1071         u32 flags = sdata->u.mntr.flags;
1072
1073 #define ADJUST(_f, _s)  do {                                    \
1074         if (flags & MONITOR_FLAG_##_f)                          \
1075                 local->fif_##_s += offset;                      \
1076         } while (0)
1077
1078         ADJUST(FCSFAIL, fcsfail);
1079         ADJUST(PLCPFAIL, plcpfail);
1080         ADJUST(CONTROL, control);
1081         ADJUST(CONTROL, pspoll);
1082         ADJUST(OTHER_BSS, other_bss);
1083
1084 #undef ADJUST
1085 }
1086
1087 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
1088 {
1089         struct ieee80211_local *local = sdata->local;
1090         int i;
1091
1092         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
1093                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1094                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
1095                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
1096                         sdata->vif.hw_queue[i] = i;
1097                 else
1098                         sdata->vif.hw_queue[i] = 0;
1099         }
1100         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
1101 }
1102
1103 static void ieee80211_sdata_init(struct ieee80211_local *local,
1104                                  struct ieee80211_sub_if_data *sdata)
1105 {
1106         sdata->local = local;
1107
1108         /*
1109          * Initialize the default link, so we can use link_id 0 for non-MLD,
1110          * and that continues to work for non-MLD-aware drivers that use just
1111          * vif.bss_conf instead of vif.link_conf.
1112          *
1113          * Note that we never change this, so if link ID 0 isn't used in an
1114          * MLD connection, we get a separate allocation for it.
1115          */
1116         ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf);
1117 }
1118
1119 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
1120 {
1121         struct ieee80211_sub_if_data *sdata;
1122         int ret;
1123
1124         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1125                 return 0;
1126
1127         ASSERT_RTNL();
1128         lockdep_assert_wiphy(local->hw.wiphy);
1129
1130         if (local->monitor_sdata)
1131                 return 0;
1132
1133         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
1134         if (!sdata)
1135                 return -ENOMEM;
1136
1137         /* set up data */
1138         sdata->vif.type = NL80211_IFTYPE_MONITOR;
1139         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
1140                  wiphy_name(local->hw.wiphy));
1141         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
1142         sdata->wdev.wiphy = local->hw.wiphy;
1143
1144         ieee80211_sdata_init(local, sdata);
1145
1146         ieee80211_set_default_queues(sdata);
1147
1148         ret = drv_add_interface(local, sdata);
1149         if (WARN_ON(ret)) {
1150                 /* ok .. stupid driver, it asked for this! */
1151                 kfree(sdata);
1152                 return ret;
1153         }
1154
1155         set_bit(SDATA_STATE_RUNNING, &sdata->state);
1156
1157         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
1158         if (ret) {
1159                 kfree(sdata);
1160                 return ret;
1161         }
1162
1163         mutex_lock(&local->iflist_mtx);
1164         rcu_assign_pointer(local->monitor_sdata, sdata);
1165         mutex_unlock(&local->iflist_mtx);
1166
1167         ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chandef,
1168                                          IEEE80211_CHANCTX_EXCLUSIVE);
1169         if (ret) {
1170                 mutex_lock(&local->iflist_mtx);
1171                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
1172                 mutex_unlock(&local->iflist_mtx);
1173                 synchronize_net();
1174                 drv_remove_interface(local, sdata);
1175                 kfree(sdata);
1176                 return ret;
1177         }
1178
1179         skb_queue_head_init(&sdata->skb_queue);
1180         skb_queue_head_init(&sdata->status_queue);
1181         wiphy_work_init(&sdata->work, ieee80211_iface_work);
1182
1183         return 0;
1184 }
1185
1186 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
1187 {
1188         struct ieee80211_sub_if_data *sdata;
1189
1190         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1191                 return;
1192
1193         ASSERT_RTNL();
1194         lockdep_assert_wiphy(local->hw.wiphy);
1195
1196         mutex_lock(&local->iflist_mtx);
1197
1198         sdata = rcu_dereference_protected(local->monitor_sdata,
1199                                           lockdep_is_held(&local->iflist_mtx));
1200         if (!sdata) {
1201                 mutex_unlock(&local->iflist_mtx);
1202                 return;
1203         }
1204
1205         RCU_INIT_POINTER(local->monitor_sdata, NULL);
1206         mutex_unlock(&local->iflist_mtx);
1207
1208         synchronize_net();
1209
1210         ieee80211_link_release_channel(&sdata->deflink);
1211
1212         drv_remove_interface(local, sdata);
1213
1214         kfree(sdata);
1215 }
1216
1217 /*
1218  * NOTE: Be very careful when changing this function, it must NOT return
1219  * an error on interface type changes that have been pre-checked, so most
1220  * checks should be in ieee80211_check_concurrent_iface.
1221  */
1222 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1223 {
1224         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1225         struct net_device *dev = wdev->netdev;
1226         struct ieee80211_local *local = sdata->local;
1227         u64 changed = 0;
1228         int res;
1229         u32 hw_reconf_flags = 0;
1230
1231         lockdep_assert_wiphy(local->hw.wiphy);
1232
1233         switch (sdata->vif.type) {
1234         case NL80211_IFTYPE_AP_VLAN: {
1235                 struct ieee80211_sub_if_data *master;
1236
1237                 if (!sdata->bss)
1238                         return -ENOLINK;
1239
1240                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1241
1242                 master = container_of(sdata->bss,
1243                                       struct ieee80211_sub_if_data, u.ap);
1244                 sdata->control_port_protocol =
1245                         master->control_port_protocol;
1246                 sdata->control_port_no_encrypt =
1247                         master->control_port_no_encrypt;
1248                 sdata->control_port_over_nl80211 =
1249                         master->control_port_over_nl80211;
1250                 sdata->control_port_no_preauth =
1251                         master->control_port_no_preauth;
1252                 sdata->vif.cab_queue = master->vif.cab_queue;
1253                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1254                        sizeof(sdata->vif.hw_queue));
1255                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1256
1257                 sdata->crypto_tx_tailroom_needed_cnt +=
1258                         master->crypto_tx_tailroom_needed_cnt;
1259
1260                 break;
1261                 }
1262         case NL80211_IFTYPE_AP:
1263                 sdata->bss = &sdata->u.ap;
1264                 break;
1265         case NL80211_IFTYPE_MESH_POINT:
1266         case NL80211_IFTYPE_STATION:
1267         case NL80211_IFTYPE_MONITOR:
1268         case NL80211_IFTYPE_ADHOC:
1269         case NL80211_IFTYPE_P2P_DEVICE:
1270         case NL80211_IFTYPE_OCB:
1271         case NL80211_IFTYPE_NAN:
1272                 /* no special treatment */
1273                 break;
1274         case NL80211_IFTYPE_UNSPECIFIED:
1275         case NUM_NL80211_IFTYPES:
1276         case NL80211_IFTYPE_P2P_CLIENT:
1277         case NL80211_IFTYPE_P2P_GO:
1278         case NL80211_IFTYPE_WDS:
1279                 /* cannot happen */
1280                 WARN_ON(1);
1281                 break;
1282         }
1283
1284         if (local->open_count == 0) {
1285                 /* here we can consider everything in good order (again) */
1286                 local->reconfig_failure = false;
1287
1288                 res = drv_start(local);
1289                 if (res)
1290                         goto err_del_bss;
1291                 /* we're brought up, everything changes */
1292                 hw_reconf_flags = ~0;
1293                 ieee80211_led_radio(local, true);
1294                 ieee80211_mod_tpt_led_trig(local,
1295                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1296         }
1297
1298         /*
1299          * Copy the hopefully now-present MAC address to
1300          * this interface, if it has the special null one.
1301          */
1302         if (dev && is_zero_ether_addr(dev->dev_addr)) {
1303                 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr);
1304                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1305
1306                 if (!is_valid_ether_addr(dev->dev_addr)) {
1307                         res = -EADDRNOTAVAIL;
1308                         goto err_stop;
1309                 }
1310         }
1311
1312         switch (sdata->vif.type) {
1313         case NL80211_IFTYPE_AP_VLAN:
1314                 /* no need to tell driver, but set carrier and chanctx */
1315                 if (sdata->bss->active) {
1316                         ieee80211_link_vlan_copy_chanctx(&sdata->deflink);
1317                         netif_carrier_on(dev);
1318                         ieee80211_set_vif_encap_ops(sdata);
1319                 } else {
1320                         netif_carrier_off(dev);
1321                 }
1322                 break;
1323         case NL80211_IFTYPE_MONITOR:
1324                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1325                         local->cooked_mntrs++;
1326                         break;
1327                 }
1328
1329                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1330                         res = drv_add_interface(local, sdata);
1331                         if (res)
1332                                 goto err_stop;
1333                 } else if (local->monitors == 0 && local->open_count == 0) {
1334                         res = ieee80211_add_virtual_monitor(local);
1335                         if (res)
1336                                 goto err_stop;
1337                 }
1338
1339                 /* must be before the call to ieee80211_configure_filter */
1340                 local->monitors++;
1341                 if (local->monitors == 1) {
1342                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1343                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1344                 }
1345
1346                 ieee80211_adjust_monitor_flags(sdata, 1);
1347                 ieee80211_configure_filter(local);
1348                 ieee80211_recalc_offload(local);
1349                 ieee80211_recalc_idle(local);
1350
1351                 netif_carrier_on(dev);
1352                 break;
1353         default:
1354                 if (coming_up) {
1355                         ieee80211_del_virtual_monitor(local);
1356                         ieee80211_set_sdata_offload_flags(sdata);
1357
1358                         res = drv_add_interface(local, sdata);
1359                         if (res)
1360                                 goto err_stop;
1361
1362                         ieee80211_set_vif_encap_ops(sdata);
1363                         res = ieee80211_check_queues(sdata,
1364                                 ieee80211_vif_type_p2p(&sdata->vif));
1365                         if (res)
1366                                 goto err_del_interface;
1367                 }
1368
1369                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1370                         local->fif_pspoll++;
1371                         local->fif_probe_req++;
1372
1373                         ieee80211_configure_filter(local);
1374                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1375                         local->fif_probe_req++;
1376                 }
1377
1378                 if (sdata->vif.probe_req_reg)
1379                         drv_config_iface_filter(local, sdata,
1380                                                 FIF_PROBE_REQ,
1381                                                 FIF_PROBE_REQ);
1382
1383                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1384                     sdata->vif.type != NL80211_IFTYPE_NAN)
1385                         changed |= ieee80211_reset_erp_info(sdata);
1386                 ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1387                                                   changed);
1388
1389                 switch (sdata->vif.type) {
1390                 case NL80211_IFTYPE_STATION:
1391                 case NL80211_IFTYPE_ADHOC:
1392                 case NL80211_IFTYPE_AP:
1393                 case NL80211_IFTYPE_MESH_POINT:
1394                 case NL80211_IFTYPE_OCB:
1395                         netif_carrier_off(dev);
1396                         break;
1397                 case NL80211_IFTYPE_P2P_DEVICE:
1398                 case NL80211_IFTYPE_NAN:
1399                         break;
1400                 default:
1401                         /* not reached */
1402                         WARN_ON(1);
1403                 }
1404
1405                 /*
1406                  * Set default queue parameters so drivers don't
1407                  * need to initialise the hardware if the hardware
1408                  * doesn't start up with sane defaults.
1409                  * Enable QoS for anything but station interfaces.
1410                  */
1411                 ieee80211_set_wmm_default(&sdata->deflink, true,
1412                         sdata->vif.type != NL80211_IFTYPE_STATION);
1413         }
1414
1415         switch (sdata->vif.type) {
1416         case NL80211_IFTYPE_P2P_DEVICE:
1417                 rcu_assign_pointer(local->p2p_sdata, sdata);
1418                 break;
1419         case NL80211_IFTYPE_MONITOR:
1420                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1421                         break;
1422                 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1423                 break;
1424         default:
1425                 break;
1426         }
1427
1428         /*
1429          * set_multicast_list will be invoked by the networking core
1430          * which will check whether any increments here were done in
1431          * error and sync them down to the hardware as filter flags.
1432          */
1433         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1434                 atomic_inc(&local->iff_allmultis);
1435
1436         if (coming_up)
1437                 local->open_count++;
1438
1439         if (hw_reconf_flags)
1440                 ieee80211_hw_config(local, hw_reconf_flags);
1441
1442         ieee80211_recalc_ps(local);
1443
1444         set_bit(SDATA_STATE_RUNNING, &sdata->state);
1445
1446         return 0;
1447  err_del_interface:
1448         drv_remove_interface(local, sdata);
1449  err_stop:
1450         if (!local->open_count)
1451                 drv_stop(local);
1452  err_del_bss:
1453         sdata->bss = NULL;
1454         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
1455                 list_del(&sdata->u.vlan.list);
1456         /* might already be clear but that doesn't matter */
1457         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1458         return res;
1459 }
1460
1461 static void ieee80211_if_free(struct net_device *dev)
1462 {
1463         free_percpu(dev->tstats);
1464 }
1465
1466 static void ieee80211_if_setup(struct net_device *dev)
1467 {
1468         ether_setup(dev);
1469         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1470         dev->priv_flags |= IFF_NO_QUEUE;
1471         dev->netdev_ops = &ieee80211_dataif_ops;
1472         dev->needs_free_netdev = true;
1473         dev->priv_destructor = ieee80211_if_free;
1474 }
1475
1476 static void ieee80211_iface_process_skb(struct ieee80211_local *local,
1477                                         struct ieee80211_sub_if_data *sdata,
1478                                         struct sk_buff *skb)
1479 {
1480         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1481
1482         lockdep_assert_wiphy(local->hw.wiphy);
1483
1484         if (ieee80211_is_action(mgmt->frame_control) &&
1485             mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1486                 struct sta_info *sta;
1487                 int len = skb->len;
1488
1489                 sta = sta_info_get_bss(sdata, mgmt->sa);
1490                 if (sta) {
1491                         switch (mgmt->u.action.u.addba_req.action_code) {
1492                         case WLAN_ACTION_ADDBA_REQ:
1493                                 ieee80211_process_addba_request(local, sta,
1494                                                                 mgmt, len);
1495                                 break;
1496                         case WLAN_ACTION_ADDBA_RESP:
1497                                 ieee80211_process_addba_resp(local, sta,
1498                                                              mgmt, len);
1499                                 break;
1500                         case WLAN_ACTION_DELBA:
1501                                 ieee80211_process_delba(sdata, sta,
1502                                                         mgmt, len);
1503                                 break;
1504                         default:
1505                                 WARN_ON(1);
1506                                 break;
1507                         }
1508                 }
1509         } else if (ieee80211_is_action(mgmt->frame_control) &&
1510                    mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1511                 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1512                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1513                         struct ieee80211_rx_status *status;
1514                         enum nl80211_band band;
1515                         struct sta_info *sta;
1516                         u8 opmode;
1517
1518                         status = IEEE80211_SKB_RXCB(skb);
1519                         band = status->band;
1520                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1521
1522                         sta = sta_info_get_bss(sdata, mgmt->sa);
1523
1524                         if (sta)
1525                                 ieee80211_vht_handle_opmode(sdata,
1526                                                             &sta->deflink,
1527                                                             opmode, band);
1528
1529                         break;
1530                 }
1531                 case WLAN_VHT_ACTION_GROUPID_MGMT:
1532                         ieee80211_process_mu_groups(sdata, &sdata->deflink,
1533                                                     mgmt);
1534                         break;
1535                 default:
1536                         WARN_ON(1);
1537                         break;
1538                 }
1539         } else if (ieee80211_is_action(mgmt->frame_control) &&
1540                    mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1541                 switch (mgmt->u.action.u.s1g.action_code) {
1542                 case WLAN_S1G_TWT_TEARDOWN:
1543                 case WLAN_S1G_TWT_SETUP:
1544                         ieee80211_s1g_rx_twt_action(sdata, skb);
1545                         break;
1546                 default:
1547                         break;
1548                 }
1549         } else if (ieee80211_is_ext(mgmt->frame_control)) {
1550                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1551                         ieee80211_sta_rx_queued_ext(sdata, skb);
1552                 else
1553                         WARN_ON(1);
1554         } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1555                 struct ieee80211_hdr *hdr = (void *)mgmt;
1556                 struct sta_info *sta;
1557
1558                 /*
1559                  * So the frame isn't mgmt, but frame_control
1560                  * is at the right place anyway, of course, so
1561                  * the if statement is correct.
1562                  *
1563                  * Warn if we have other data frame types here,
1564                  * they must not get here.
1565                  */
1566                 WARN_ON(hdr->frame_control &
1567                                 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1568                 WARN_ON(!(hdr->seq_ctrl &
1569                                 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1570                 /*
1571                  * This was a fragment of a frame, received while
1572                  * a block-ack session was active. That cannot be
1573                  * right, so terminate the session.
1574                  */
1575                 sta = sta_info_get_bss(sdata, mgmt->sa);
1576                 if (sta) {
1577                         u16 tid = ieee80211_get_tid(hdr);
1578
1579                         __ieee80211_stop_rx_ba_session(
1580                                 sta, tid, WLAN_BACK_RECIPIENT,
1581                                 WLAN_REASON_QSTA_REQUIRE_SETUP,
1582                                 true);
1583                 }
1584         } else switch (sdata->vif.type) {
1585         case NL80211_IFTYPE_STATION:
1586                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1587                 break;
1588         case NL80211_IFTYPE_ADHOC:
1589                 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1590                 break;
1591         case NL80211_IFTYPE_MESH_POINT:
1592                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1593                         break;
1594                 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1595                 break;
1596         default:
1597                 WARN(1, "frame for unexpected interface type");
1598                 break;
1599         }
1600 }
1601
1602 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata,
1603                                            struct sk_buff *skb)
1604 {
1605         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1606
1607         if (ieee80211_is_action(mgmt->frame_control) &&
1608             mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1609                 switch (mgmt->u.action.u.s1g.action_code) {
1610                 case WLAN_S1G_TWT_TEARDOWN:
1611                 case WLAN_S1G_TWT_SETUP:
1612                         ieee80211_s1g_status_twt_action(sdata, skb);
1613                         break;
1614                 default:
1615                         break;
1616                 }
1617         }
1618 }
1619
1620 static void ieee80211_iface_work(struct wiphy *wiphy, struct wiphy_work *work)
1621 {
1622         struct ieee80211_sub_if_data *sdata =
1623                 container_of(work, struct ieee80211_sub_if_data, work);
1624         struct ieee80211_local *local = sdata->local;
1625         struct sk_buff *skb;
1626
1627         if (!ieee80211_sdata_running(sdata))
1628                 return;
1629
1630         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1631                 return;
1632
1633         if (!ieee80211_can_run_worker(local))
1634                 return;
1635
1636         /* first process frames */
1637         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1638                 kcov_remote_start_common(skb_get_kcov_handle(skb));
1639
1640                 if (skb->protocol == cpu_to_be16(ETH_P_TDLS))
1641                         ieee80211_process_tdls_channel_switch(sdata, skb);
1642                 else
1643                         ieee80211_iface_process_skb(local, sdata, skb);
1644
1645                 kfree_skb(skb);
1646                 kcov_remote_stop();
1647         }
1648
1649         /* process status queue */
1650         while ((skb = skb_dequeue(&sdata->status_queue))) {
1651                 kcov_remote_start_common(skb_get_kcov_handle(skb));
1652
1653                 ieee80211_iface_process_status(sdata, skb);
1654                 kfree_skb(skb);
1655
1656                 kcov_remote_stop();
1657         }
1658
1659         /* then other type-dependent work */
1660         switch (sdata->vif.type) {
1661         case NL80211_IFTYPE_STATION:
1662                 ieee80211_sta_work(sdata);
1663                 break;
1664         case NL80211_IFTYPE_ADHOC:
1665                 ieee80211_ibss_work(sdata);
1666                 break;
1667         case NL80211_IFTYPE_MESH_POINT:
1668                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1669                         break;
1670                 ieee80211_mesh_work(sdata);
1671                 break;
1672         case NL80211_IFTYPE_OCB:
1673                 ieee80211_ocb_work(sdata);
1674                 break;
1675         default:
1676                 break;
1677         }
1678 }
1679
1680 static void ieee80211_activate_links_work(struct wiphy *wiphy,
1681                                           struct wiphy_work *work)
1682 {
1683         struct ieee80211_sub_if_data *sdata =
1684                 container_of(work, struct ieee80211_sub_if_data,
1685                              activate_links_work);
1686
1687         ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links);
1688 }
1689
1690 /*
1691  * Helper function to initialise an interface to a specific type.
1692  */
1693 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1694                                   enum nl80211_iftype type)
1695 {
1696         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1697                                                     0xff, 0xff, 0xff};
1698
1699         /* clear type-dependent unions */
1700         memset(&sdata->u, 0, sizeof(sdata->u));
1701         memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u));
1702
1703         /* and set some type-dependent values */
1704         sdata->vif.type = type;
1705         sdata->vif.p2p = false;
1706         sdata->wdev.iftype = type;
1707
1708         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1709         sdata->control_port_no_encrypt = false;
1710         sdata->control_port_over_nl80211 = false;
1711         sdata->control_port_no_preauth = false;
1712         sdata->vif.cfg.idle = true;
1713         sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1714
1715         sdata->noack_map = 0;
1716
1717         /* only monitor/p2p-device differ */
1718         if (sdata->dev) {
1719                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1720                 sdata->dev->type = ARPHRD_ETHER;
1721         }
1722
1723         skb_queue_head_init(&sdata->skb_queue);
1724         skb_queue_head_init(&sdata->status_queue);
1725         wiphy_work_init(&sdata->work, ieee80211_iface_work);
1726         wiphy_work_init(&sdata->activate_links_work,
1727                         ieee80211_activate_links_work);
1728
1729         switch (type) {
1730         case NL80211_IFTYPE_P2P_GO:
1731                 type = NL80211_IFTYPE_AP;
1732                 sdata->vif.type = type;
1733                 sdata->vif.p2p = true;
1734                 fallthrough;
1735         case NL80211_IFTYPE_AP:
1736                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1737                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1738                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1739                 break;
1740         case NL80211_IFTYPE_P2P_CLIENT:
1741                 type = NL80211_IFTYPE_STATION;
1742                 sdata->vif.type = type;
1743                 sdata->vif.p2p = true;
1744                 fallthrough;
1745         case NL80211_IFTYPE_STATION:
1746                 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid;
1747                 ieee80211_sta_setup_sdata(sdata);
1748                 break;
1749         case NL80211_IFTYPE_OCB:
1750                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1751                 ieee80211_ocb_setup_sdata(sdata);
1752                 break;
1753         case NL80211_IFTYPE_ADHOC:
1754                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1755                 ieee80211_ibss_setup_sdata(sdata);
1756                 break;
1757         case NL80211_IFTYPE_MESH_POINT:
1758                 if (ieee80211_vif_is_mesh(&sdata->vif))
1759                         ieee80211_mesh_init_sdata(sdata);
1760                 break;
1761         case NL80211_IFTYPE_MONITOR:
1762                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1763                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1764                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1765                                       MONITOR_FLAG_OTHER_BSS;
1766                 break;
1767         case NL80211_IFTYPE_NAN:
1768                 idr_init(&sdata->u.nan.function_inst_ids);
1769                 spin_lock_init(&sdata->u.nan.func_lock);
1770                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1771                 break;
1772         case NL80211_IFTYPE_AP_VLAN:
1773         case NL80211_IFTYPE_P2P_DEVICE:
1774                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1775                 break;
1776         case NL80211_IFTYPE_UNSPECIFIED:
1777         case NL80211_IFTYPE_WDS:
1778         case NUM_NL80211_IFTYPES:
1779                 WARN_ON(1);
1780                 break;
1781         }
1782
1783         /* need to do this after the switch so vif.type is correct */
1784         ieee80211_link_setup(&sdata->deflink);
1785
1786         ieee80211_debugfs_add_netdev(sdata, false);
1787 }
1788
1789 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1790                                            enum nl80211_iftype type)
1791 {
1792         struct ieee80211_local *local = sdata->local;
1793         int ret, err;
1794         enum nl80211_iftype internal_type = type;
1795         bool p2p = false;
1796
1797         ASSERT_RTNL();
1798
1799         if (!local->ops->change_interface)
1800                 return -EBUSY;
1801
1802         /* for now, don't support changing while links exist */
1803         if (ieee80211_vif_is_mld(&sdata->vif))
1804                 return -EBUSY;
1805
1806         switch (sdata->vif.type) {
1807         case NL80211_IFTYPE_AP:
1808                 if (!list_empty(&sdata->u.ap.vlans))
1809                         return -EBUSY;
1810                 break;
1811         case NL80211_IFTYPE_STATION:
1812         case NL80211_IFTYPE_ADHOC:
1813         case NL80211_IFTYPE_OCB:
1814                 /*
1815                  * Could maybe also all others here?
1816                  * Just not sure how that interacts
1817                  * with the RX/config path e.g. for
1818                  * mesh.
1819                  */
1820                 break;
1821         default:
1822                 return -EBUSY;
1823         }
1824
1825         switch (type) {
1826         case NL80211_IFTYPE_AP:
1827         case NL80211_IFTYPE_STATION:
1828         case NL80211_IFTYPE_ADHOC:
1829         case NL80211_IFTYPE_OCB:
1830                 /*
1831                  * Could probably support everything
1832                  * but here.
1833                  */
1834                 break;
1835         case NL80211_IFTYPE_P2P_CLIENT:
1836                 p2p = true;
1837                 internal_type = NL80211_IFTYPE_STATION;
1838                 break;
1839         case NL80211_IFTYPE_P2P_GO:
1840                 p2p = true;
1841                 internal_type = NL80211_IFTYPE_AP;
1842                 break;
1843         default:
1844                 return -EBUSY;
1845         }
1846
1847         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1848         if (ret)
1849                 return ret;
1850
1851         ieee80211_stop_vif_queues(local, sdata,
1852                                   IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1853         /* do_stop will synchronize_rcu() first thing */
1854         ieee80211_do_stop(sdata, false);
1855
1856         ieee80211_teardown_sdata(sdata);
1857
1858         ieee80211_set_sdata_offload_flags(sdata);
1859         ret = drv_change_interface(local, sdata, internal_type, p2p);
1860         if (ret)
1861                 type = ieee80211_vif_type_p2p(&sdata->vif);
1862
1863         /*
1864          * Ignore return value here, there's not much we can do since
1865          * the driver changed the interface type internally already.
1866          * The warnings will hopefully make driver authors fix it :-)
1867          */
1868         ieee80211_check_queues(sdata, type);
1869
1870         ieee80211_setup_sdata(sdata, type);
1871         ieee80211_set_vif_encap_ops(sdata);
1872
1873         err = ieee80211_do_open(&sdata->wdev, false);
1874         WARN(err, "type change: do_open returned %d", err);
1875
1876         ieee80211_wake_vif_queues(local, sdata,
1877                                   IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1878         return ret;
1879 }
1880
1881 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1882                              enum nl80211_iftype type)
1883 {
1884         int ret;
1885
1886         ASSERT_RTNL();
1887
1888         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1889                 return 0;
1890
1891         if (ieee80211_sdata_running(sdata)) {
1892                 ret = ieee80211_runtime_change_iftype(sdata, type);
1893                 if (ret)
1894                         return ret;
1895         } else {
1896                 /* Purge and reset type-dependent state. */
1897                 ieee80211_teardown_sdata(sdata);
1898                 ieee80211_setup_sdata(sdata, type);
1899         }
1900
1901         /* reset some values that shouldn't be kept across type changes */
1902         if (type == NL80211_IFTYPE_STATION)
1903                 sdata->u.mgd.use_4addr = false;
1904
1905         return 0;
1906 }
1907
1908 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1909                                        u8 *perm_addr, enum nl80211_iftype type)
1910 {
1911         struct ieee80211_sub_if_data *sdata;
1912         u64 mask, start, addr, val, inc;
1913         u8 *m;
1914         u8 tmp_addr[ETH_ALEN];
1915         int i;
1916
1917         lockdep_assert_wiphy(local->hw.wiphy);
1918
1919         /* default ... something at least */
1920         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1921
1922         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1923             local->hw.wiphy->n_addresses <= 1)
1924                 return;
1925
1926         switch (type) {
1927         case NL80211_IFTYPE_MONITOR:
1928                 /* doesn't matter */
1929                 break;
1930         case NL80211_IFTYPE_AP_VLAN:
1931                 /* match up with an AP interface */
1932                 list_for_each_entry(sdata, &local->interfaces, list) {
1933                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1934                                 continue;
1935                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1936                         break;
1937                 }
1938                 /* keep default if no AP interface present */
1939                 break;
1940         case NL80211_IFTYPE_P2P_CLIENT:
1941         case NL80211_IFTYPE_P2P_GO:
1942                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1943                         list_for_each_entry(sdata, &local->interfaces, list) {
1944                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1945                                         continue;
1946                                 if (!ieee80211_sdata_running(sdata))
1947                                         continue;
1948                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1949                                 return;
1950                         }
1951                 }
1952                 fallthrough;
1953         default:
1954                 /* assign a new address if possible -- try n_addresses first */
1955                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1956                         bool used = false;
1957
1958                         list_for_each_entry(sdata, &local->interfaces, list) {
1959                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1960                                                      sdata->vif.addr)) {
1961                                         used = true;
1962                                         break;
1963                                 }
1964                         }
1965
1966                         if (!used) {
1967                                 memcpy(perm_addr,
1968                                        local->hw.wiphy->addresses[i].addr,
1969                                        ETH_ALEN);
1970                                 break;
1971                         }
1972                 }
1973
1974                 /* try mask if available */
1975                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1976                         break;
1977
1978                 m = local->hw.wiphy->addr_mask;
1979                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1980                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1981                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1982
1983                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1984                         /* not a contiguous mask ... not handled now! */
1985                         pr_info("not contiguous\n");
1986                         break;
1987                 }
1988
1989                 /*
1990                  * Pick address of existing interface in case user changed
1991                  * MAC address manually, default to perm_addr.
1992                  */
1993                 m = local->hw.wiphy->perm_addr;
1994                 list_for_each_entry(sdata, &local->interfaces, list) {
1995                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1996                                 continue;
1997                         m = sdata->vif.addr;
1998                         break;
1999                 }
2000                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
2001                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
2002                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
2003
2004                 inc = 1ULL<<__ffs64(mask);
2005                 val = (start & mask);
2006                 addr = (start & ~mask) | (val & mask);
2007                 do {
2008                         bool used = false;
2009
2010                         tmp_addr[5] = addr >> 0*8;
2011                         tmp_addr[4] = addr >> 1*8;
2012                         tmp_addr[3] = addr >> 2*8;
2013                         tmp_addr[2] = addr >> 3*8;
2014                         tmp_addr[1] = addr >> 4*8;
2015                         tmp_addr[0] = addr >> 5*8;
2016
2017                         val += inc;
2018
2019                         list_for_each_entry(sdata, &local->interfaces, list) {
2020                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
2021                                         used = true;
2022                                         break;
2023                                 }
2024                         }
2025
2026                         if (!used) {
2027                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
2028                                 break;
2029                         }
2030                         addr = (start & ~mask) | (val & mask);
2031                 } while (addr != start);
2032
2033                 break;
2034         }
2035 }
2036
2037 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
2038                      unsigned char name_assign_type,
2039                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
2040                      struct vif_params *params)
2041 {
2042         struct net_device *ndev = NULL;
2043         struct ieee80211_sub_if_data *sdata = NULL;
2044         struct txq_info *txqi;
2045         int ret, i;
2046
2047         ASSERT_RTNL();
2048         lockdep_assert_wiphy(local->hw.wiphy);
2049
2050         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
2051                 struct wireless_dev *wdev;
2052
2053                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
2054                                 GFP_KERNEL);
2055                 if (!sdata)
2056                         return -ENOMEM;
2057                 wdev = &sdata->wdev;
2058
2059                 sdata->dev = NULL;
2060                 strscpy(sdata->name, name, IFNAMSIZ);
2061                 ieee80211_assign_perm_addr(local, wdev->address, type);
2062                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
2063                 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
2064         } else {
2065                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
2066                                  sizeof(void *));
2067                 int txq_size = 0;
2068
2069                 if (type != NL80211_IFTYPE_AP_VLAN &&
2070                     (type != NL80211_IFTYPE_MONITOR ||
2071                      (params->flags & MONITOR_FLAG_ACTIVE)))
2072                         txq_size += sizeof(struct txq_info) +
2073                                     local->hw.txq_data_size;
2074
2075                 ndev = alloc_netdev_mqs(size + txq_size,
2076                                         name, name_assign_type,
2077                                         ieee80211_if_setup, 1, 1);
2078                 if (!ndev)
2079                         return -ENOMEM;
2080
2081                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
2082
2083                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2084                 if (!ndev->tstats) {
2085                         free_netdev(ndev);
2086                         return -ENOMEM;
2087                 }
2088
2089                 ndev->needed_headroom = local->tx_headroom +
2090                                         4*6 /* four MAC addresses */
2091                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
2092                                         + 6 /* mesh */
2093                                         + 8 /* rfc1042/bridge tunnel */
2094                                         - ETH_HLEN /* ethernet hard_header_len */
2095                                         + IEEE80211_ENCRYPT_HEADROOM;
2096                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
2097
2098                 ret = dev_alloc_name(ndev, ndev->name);
2099                 if (ret < 0) {
2100                         ieee80211_if_free(ndev);
2101                         free_netdev(ndev);
2102                         return ret;
2103                 }
2104
2105                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
2106                 if (is_valid_ether_addr(params->macaddr))
2107                         eth_hw_addr_set(ndev, params->macaddr);
2108                 else
2109                         eth_hw_addr_set(ndev, ndev->perm_addr);
2110                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
2111
2112                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
2113                 sdata = netdev_priv(ndev);
2114                 ndev->ieee80211_ptr = &sdata->wdev;
2115                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
2116                 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
2117                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
2118
2119                 if (txq_size) {
2120                         txqi = netdev_priv(ndev) + size;
2121                         ieee80211_txq_init(sdata, NULL, txqi, 0);
2122                 }
2123
2124                 sdata->dev = ndev;
2125         }
2126
2127         /* initialise type-independent data */
2128         sdata->wdev.wiphy = local->hw.wiphy;
2129
2130         ieee80211_sdata_init(local, sdata);
2131
2132         ieee80211_init_frag_cache(&sdata->frags);
2133
2134         INIT_LIST_HEAD(&sdata->key_list);
2135
2136         wiphy_delayed_work_init(&sdata->dec_tailroom_needed_wk,
2137                                 ieee80211_delayed_tailroom_dec);
2138
2139         for (i = 0; i < NUM_NL80211_BANDS; i++) {
2140                 struct ieee80211_supported_band *sband;
2141                 sband = local->hw.wiphy->bands[i];
2142                 sdata->rc_rateidx_mask[i] =
2143                         sband ? (1 << sband->n_bitrates) - 1 : 0;
2144                 if (sband) {
2145                         __le16 cap;
2146                         u16 *vht_rate_mask;
2147
2148                         memcpy(sdata->rc_rateidx_mcs_mask[i],
2149                                sband->ht_cap.mcs.rx_mask,
2150                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
2151
2152                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
2153                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
2154                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
2155                 } else {
2156                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
2157                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
2158                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
2159                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
2160                 }
2161         }
2162
2163         ieee80211_set_default_queues(sdata);
2164
2165         sdata->deflink.ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2166         sdata->deflink.user_power_level = local->user_power_level;
2167
2168         /* setup type-dependent data */
2169         ieee80211_setup_sdata(sdata, type);
2170
2171         if (ndev) {
2172                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
2173                 if (type == NL80211_IFTYPE_STATION)
2174                         sdata->u.mgd.use_4addr = params->use_4addr;
2175
2176                 ndev->features |= local->hw.netdev_features;
2177                 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2178                 ndev->hw_features |= ndev->features &
2179                                         MAC80211_SUPPORTED_FEATURES_TX;
2180                 sdata->vif.netdev_features = local->hw.netdev_features;
2181
2182                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
2183
2184                 /* MTU range is normally 256 - 2304, where the upper limit is
2185                  * the maximum MSDU size. Monitor interfaces send and receive
2186                  * MPDU and A-MSDU frames which may be much larger so we do
2187                  * not impose an upper limit in that case.
2188                  */
2189                 ndev->min_mtu = 256;
2190                 if (type == NL80211_IFTYPE_MONITOR)
2191                         ndev->max_mtu = 0;
2192                 else
2193                         ndev->max_mtu = local->hw.max_mtu;
2194
2195                 ret = cfg80211_register_netdevice(ndev);
2196                 if (ret) {
2197                         free_netdev(ndev);
2198                         return ret;
2199                 }
2200         }
2201
2202         mutex_lock(&local->iflist_mtx);
2203         list_add_tail_rcu(&sdata->list, &local->interfaces);
2204         mutex_unlock(&local->iflist_mtx);
2205
2206         if (new_wdev)
2207                 *new_wdev = &sdata->wdev;
2208
2209         return 0;
2210 }
2211
2212 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2213 {
2214         ASSERT_RTNL();
2215         lockdep_assert_wiphy(sdata->local->hw.wiphy);
2216
2217         mutex_lock(&sdata->local->iflist_mtx);
2218         list_del_rcu(&sdata->list);
2219         mutex_unlock(&sdata->local->iflist_mtx);
2220
2221         if (sdata->vif.txq)
2222                 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2223
2224         synchronize_rcu();
2225
2226         cfg80211_unregister_wdev(&sdata->wdev);
2227
2228         if (!sdata->dev) {
2229                 ieee80211_teardown_sdata(sdata);
2230                 kfree(sdata);
2231         }
2232 }
2233
2234 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2235 {
2236         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2237                 return;
2238         ieee80211_do_stop(sdata, true);
2239 }
2240
2241 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2242 {
2243         struct ieee80211_sub_if_data *sdata, *tmp;
2244         LIST_HEAD(unreg_list);
2245
2246         ASSERT_RTNL();
2247
2248         /* Before destroying the interfaces, make sure they're all stopped so
2249          * that the hardware is stopped. Otherwise, the driver might still be
2250          * iterating the interfaces during the shutdown, e.g. from a worker
2251          * or from RX processing or similar, and if it does so (using atomic
2252          * iteration) while we're manipulating the list, the iteration will
2253          * crash.
2254          *
2255          * After this, the hardware should be stopped and the driver should
2256          * have stopped all of its activities, so that we can do RCU-unaware
2257          * manipulations of the interface list below.
2258          */
2259         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2260
2261         wiphy_lock(local->hw.wiphy);
2262
2263         WARN(local->open_count, "%s: open count remains %d\n",
2264              wiphy_name(local->hw.wiphy), local->open_count);
2265
2266         mutex_lock(&local->iflist_mtx);
2267         list_splice_init(&local->interfaces, &unreg_list);
2268         mutex_unlock(&local->iflist_mtx);
2269
2270         list_for_each_entry_safe(sdata, tmp, &unreg_list, list) {
2271                 bool netdev = sdata->dev;
2272
2273                 /*
2274                  * Remove IP addresses explicitly, since the notifier will
2275                  * skip the callbacks if wdev->registered is false, since
2276                  * we can't acquire the wiphy_lock() again there if already
2277                  * inside this locked section.
2278                  */
2279                 sdata->vif.cfg.arp_addr_cnt = 0;
2280                 if (sdata->vif.type == NL80211_IFTYPE_STATION &&
2281                     sdata->u.mgd.associated)
2282                         ieee80211_vif_cfg_change_notify(sdata,
2283                                                         BSS_CHANGED_ARP_FILTER);
2284
2285                 list_del(&sdata->list);
2286                 cfg80211_unregister_wdev(&sdata->wdev);
2287
2288                 if (!netdev)
2289                         kfree(sdata);
2290         }
2291         wiphy_unlock(local->hw.wiphy);
2292 }
2293
2294 static int netdev_notify(struct notifier_block *nb,
2295                          unsigned long state, void *ptr)
2296 {
2297         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2298         struct ieee80211_sub_if_data *sdata;
2299
2300         if (state != NETDEV_CHANGENAME)
2301                 return NOTIFY_DONE;
2302
2303         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2304                 return NOTIFY_DONE;
2305
2306         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2307                 return NOTIFY_DONE;
2308
2309         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2310         memcpy(sdata->name, dev->name, IFNAMSIZ);
2311         ieee80211_debugfs_rename_netdev(sdata);
2312
2313         return NOTIFY_OK;
2314 }
2315
2316 static struct notifier_block mac80211_netdev_notifier = {
2317         .notifier_call = netdev_notify,
2318 };
2319
2320 int ieee80211_iface_init(void)
2321 {
2322         return register_netdevice_notifier(&mac80211_netdev_notifier);
2323 }
2324
2325 void ieee80211_iface_exit(void)
2326 {
2327         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2328 }
2329
2330 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2331 {
2332         if (sdata->vif.type == NL80211_IFTYPE_AP)
2333                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2334         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2335                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2336 }
2337
2338 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2339 {
2340         if (sdata->vif.type == NL80211_IFTYPE_AP)
2341                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2342         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2343                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2344 }