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) 2018-2021 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
  37  * (2) modifications and readers are protected against each other by
  38  *     the iflist_mtx.
  39  * (3) modifications are done in an RCU manner so atomic readers
  40  *     can traverse the list in RCU-safe blocks.
  41  *
  42  * As a consequence, reads (traversals) of the list can be protected
  43  * by either the RTNL, the iflist_mtx or RCU.
  44  */
  45
  46 static void ieee80211_iface_work(struct work_struct *work);
  47
  48 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  49 {
  50         struct ieee80211_chanctx_conf *chanctx_conf;
  51         int power;
  52
  53         rcu_read_lock();
  54         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  55         if (!chanctx_conf) {
  56                 rcu_read_unlock();
  57                 return false;
  58         }
  59
  60         power = ieee80211_chandef_max_power(&chanctx_conf->def);
  61         rcu_read_unlock();
  62
  63         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  64                 power = min(power, sdata->user_power_level);
  65
  66         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  67                 power = min(power, sdata->ap_power_level);
  68
  69         if (power != sdata->vif.bss_conf.txpower) {
  70                 sdata->vif.bss_conf.txpower = power;
  71                 ieee80211_hw_config(sdata->local, 0);
  72                 return true;
  73         }
  74
  75         return false;
  76 }
  77
  78 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
  79                               bool update_bss)
  80 {
  81         if (__ieee80211_recalc_txpower(sdata) ||
  82             (update_bss && ieee80211_sdata_running(sdata)))
  83                 ieee80211_bss_info_change_notify(sdata, 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_held(&local->mtx);
 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         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 163                 return 0;
 164
 165         m = addr;
 166         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 167                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 168                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 169
 170         m = local->hw.wiphy->addr_mask;
 171         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 172                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 173                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 174
 175         if (!check_dup)
 176                 return ret;
 177
 178         mutex_lock(&local->iflist_mtx);
 179         list_for_each_entry(iter, &local->interfaces, list) {
 180                 if (iter == sdata)
 181                         continue;
 182
 183                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 184                     !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 185                         continue;
 186
 187                 m = iter->vif.addr;
 188                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 189                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 190                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 191
 192                 if ((new & ~mask) != (tmp & ~mask)) {
 193                         ret = -EINVAL;
 194                         break;
 195                 }
 196         }
 197         mutex_unlock(&local->iflist_mtx);
 198
 199         return ret;
 200 }
 201
 202 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 203 {
 204         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 205         struct sockaddr *sa = addr;
 206         bool check_dup = true;
 207         int ret;
 208
 209         if (ieee80211_sdata_running(sdata))
 210                 return -EBUSY;
 211
 212         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 213             !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 214                 check_dup = false;
 215
 216         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 217         if (ret)
 218                 return ret;
 219
 220         ret = eth_mac_addr(dev, sa);
 221
 222         if (ret == 0)
 223                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 224
 225         return ret;
 226 }
 227
 228 static inline int identical_mac_addr_allowed(int type1, int type2)
 229 {
 230         return type1 == NL80211_IFTYPE_MONITOR ||
 231                 type2 == NL80211_IFTYPE_MONITOR ||
 232                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 233                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 234                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 235                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 236                         (type2 == NL80211_IFTYPE_AP ||
 237                          type2 == NL80211_IFTYPE_AP_VLAN));
 238 }
 239
 240 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 241                                             enum nl80211_iftype iftype)
 242 {
 243         struct ieee80211_local *local = sdata->local;
 244         struct ieee80211_sub_if_data *nsdata;
 245         int ret;
 246
 247         ASSERT_RTNL();
 248
 249         /* we hold the RTNL here so can safely walk the list */
 250         list_for_each_entry(nsdata, &local->interfaces, list) {
 251                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 252                         /*
 253                          * Only OCB and monitor mode may coexist
 254                          */
 255                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
 256                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
 257                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 258                              nsdata->vif.type == NL80211_IFTYPE_OCB))
 259                                 return -EBUSY;
 260
 261                         /*
 262                          * Allow only a single IBSS interface to be up at any
 263                          * time. This is restricted because beacon distribution
 264                          * cannot work properly if both are in the same IBSS.
 265                          *
 266                          * To remove this restriction we'd have to disallow them
 267                          * from setting the same SSID on different IBSS interfaces
 268                          * belonging to the same hardware. Then, however, we're
 269                          * faced with having to adopt two different TSF timers...
 270                          */
 271                         if (iftype == NL80211_IFTYPE_ADHOC &&
 272                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 273                                 return -EBUSY;
 274                         /*
 275                          * will not add another interface while any channel
 276                          * switch is active.
 277                          */
 278                         if (nsdata->vif.csa_active)
 279                                 return -EBUSY;
 280
 281                         /*
 282                          * The remaining checks are only performed for interfaces
 283                          * with the same MAC address.
 284                          */
 285                         if (!ether_addr_equal(sdata->vif.addr,
 286                                               nsdata->vif.addr))
 287                                 continue;
 288
 289                         /*
 290                          * check whether it may have the same address
 291                          */
 292                         if (!identical_mac_addr_allowed(iftype,
 293                                                         nsdata->vif.type))
 294                                 return -ENOTUNIQ;
 295
 296                         /*
 297                          * can only add VLANs to enabled APs
 298                          */
 299                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 300                             nsdata->vif.type == NL80211_IFTYPE_AP)
 301                                 sdata->bss = &nsdata->u.ap;
 302                 }
 303         }
 304
 305         mutex_lock(&local->chanctx_mtx);
 306         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
 307         mutex_unlock(&local->chanctx_mtx);
 308         return ret;
 309 }
 310
 311 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 312                                   enum nl80211_iftype iftype)
 313 {
 314         int n_queues = sdata->local->hw.queues;
 315         int i;
 316
 317         if (iftype == NL80211_IFTYPE_NAN)
 318                 return 0;
 319
 320         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 321                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 322                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 323                                          IEEE80211_INVAL_HW_QUEUE))
 324                                 return -EINVAL;
 325                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 326                                          n_queues))
 327                                 return -EINVAL;
 328                 }
 329         }
 330
 331         if ((iftype != NL80211_IFTYPE_AP &&
 332              iftype != NL80211_IFTYPE_P2P_GO &&
 333              iftype != NL80211_IFTYPE_MESH_POINT) ||
 334             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
 335                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 336                 return 0;
 337         }
 338
 339         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 340                 return -EINVAL;
 341
 342         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 343                 return -EINVAL;
 344
 345         return 0;
 346 }
 347
 348 static int ieee80211_open(struct net_device *dev)
 349 {
 350         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 351         int err;
 352
 353         /* fail early if user set an invalid address */
 354         if (!is_valid_ether_addr(dev->dev_addr))
 355                 return -EADDRNOTAVAIL;
 356
 357         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 358         if (err)
 359                 return err;
 360
 361         wiphy_lock(sdata->local->hw.wiphy);
 362         err = ieee80211_do_open(&sdata->wdev, true);
 363         wiphy_unlock(sdata->local->hw.wiphy);
 364
 365         return err;
 366 }
 367
 368 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down)
 369 {
 370         struct ieee80211_local *local = sdata->local;
 371         unsigned long flags;
 372         struct sk_buff *skb, *tmp;
 373         u32 hw_reconf_flags = 0;
 374         int i, flushed;
 375         struct ps_data *ps;
 376         struct cfg80211_chan_def chandef;
 377         bool cancel_scan;
 378         struct cfg80211_nan_func *func;
 379
 380         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 381
 382         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 383         if (cancel_scan)
 384                 ieee80211_scan_cancel(local);
 385
 386         /*
 387          * Stop TX on this interface first.
 388          */
 389         if (sdata->dev)
 390                 netif_tx_stop_all_queues(sdata->dev);
 391
 392         ieee80211_roc_purge(local, sdata);
 393
 394         switch (sdata->vif.type) {
 395         case NL80211_IFTYPE_STATION:
 396                 ieee80211_mgd_stop(sdata);
 397                 break;
 398         case NL80211_IFTYPE_ADHOC:
 399                 ieee80211_ibss_stop(sdata);
 400                 break;
 401         case NL80211_IFTYPE_MONITOR:
 402                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
 403                         break;
 404                 list_del_rcu(&sdata->u.mntr.list);
 405                 break;
 406         default:
 407                 break;
 408         }
 409
 410         /*
 411          * Remove all stations associated with this interface.
 412          *
 413          * This must be done before calling ops->remove_interface()
 414          * because otherwise we can later invoke ops->sta_notify()
 415          * whenever the STAs are removed, and that invalidates driver
 416          * assumptions about always getting a vif pointer that is valid
 417          * (because if we remove a STA after ops->remove_interface()
 418          * the driver will have removed the vif info already!)
 419          *
 420          * For AP_VLANs stations may exist since there's nothing else that
 421          * would have removed them, but in other modes there shouldn't
 422          * be any stations.
 423          */
 424         flushed = sta_info_flush(sdata);
 425         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0);
 426
 427         /* don't count this interface for allmulti while it is down */
 428         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 429                 atomic_dec(&local->iff_allmultis);
 430
 431         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 432                 local->fif_pspoll--;
 433                 local->fif_probe_req--;
 434         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 435                 local->fif_probe_req--;
 436         }
 437
 438         if (sdata->dev) {
 439                 netif_addr_lock_bh(sdata->dev);
 440                 spin_lock_bh(&local->filter_lock);
 441                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 442                                  sdata->dev->addr_len);
 443                 spin_unlock_bh(&local->filter_lock);
 444                 netif_addr_unlock_bh(sdata->dev);
 445         }
 446
 447         del_timer_sync(&local->dynamic_ps_timer);
 448         cancel_work_sync(&local->dynamic_ps_enable_work);
 449
 450         cancel_work_sync(&sdata->recalc_smps);
 451         sdata_lock(sdata);
 452         mutex_lock(&local->mtx);
 453         sdata->vif.csa_active = false;
 454         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 455                 sdata->u.mgd.csa_waiting_bcn = false;
 456         if (sdata->csa_block_tx) {
 457                 ieee80211_wake_vif_queues(local, sdata,
 458                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 459                 sdata->csa_block_tx = false;
 460         }
 461         mutex_unlock(&local->mtx);
 462         sdata_unlock(sdata);
 463
 464         cancel_work_sync(&sdata->csa_finalize_work);
 465         cancel_work_sync(&sdata->color_change_finalize_work);
 466
 467         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 468
 469         if (sdata->wdev.cac_started) {
 470                 chandef = sdata->vif.bss_conf.chandef;
 471                 WARN_ON(local->suspended);
 472                 mutex_lock(&local->mtx);
 473                 ieee80211_vif_release_channel(sdata);
 474                 mutex_unlock(&local->mtx);
 475                 cfg80211_cac_event(sdata->dev, &chandef,
 476                                    NL80211_RADAR_CAC_ABORTED,
 477                                    GFP_KERNEL);
 478         }
 479
 480         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 481                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 482         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 483                 /* remove all packets in parent bc_buf pointing to this dev */
 484                 ps = &sdata->bss->ps;
 485
 486                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 487                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 488                         if (skb->dev == sdata->dev) {
 489                                 __skb_unlink(skb, &ps->bc_buf);
 490                                 local->total_ps_buffered--;
 491                                 ieee80211_free_txskb(&local->hw, skb);
 492                         }
 493                 }
 494                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 495         }
 496
 497         if (going_down)
 498                 local->open_count--;
 499
 500         switch (sdata->vif.type) {
 501         case NL80211_IFTYPE_AP_VLAN:
 502                 mutex_lock(&local->mtx);
 503                 list_del(&sdata->u.vlan.list);
 504                 mutex_unlock(&local->mtx);
 505                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 506                 /* see comment in the default case below */
 507                 ieee80211_free_keys(sdata, true);
 508                 /* no need to tell driver */
 509                 break;
 510         case NL80211_IFTYPE_MONITOR:
 511                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 512                         local->cooked_mntrs--;
 513                         break;
 514                 }
 515
 516                 local->monitors--;
 517                 if (local->monitors == 0) {
 518                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 519                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 520                 }
 521
 522                 ieee80211_adjust_monitor_flags(sdata, -1);
 523                 break;
 524         case NL80211_IFTYPE_NAN:
 525                 /* clean all the functions */
 526                 spin_lock_bh(&sdata->u.nan.func_lock);
 527
 528                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
 529                         idr_remove(&sdata->u.nan.function_inst_ids, i);
 530                         cfg80211_free_nan_func(func);
 531                 }
 532                 idr_destroy(&sdata->u.nan.function_inst_ids);
 533
 534                 spin_unlock_bh(&sdata->u.nan.func_lock);
 535                 break;
 536         case NL80211_IFTYPE_P2P_DEVICE:
 537                 /* relies on synchronize_rcu() below */
 538                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 539                 fallthrough;
 540         default:
 541                 cancel_work_sync(&sdata->work);
 542                 /*
 543                  * When we get here, the interface is marked down.
 544                  * Free the remaining keys, if there are any
 545                  * (which can happen in AP mode if userspace sets
 546                  * keys before the interface is operating)
 547                  *
 548                  * Force the key freeing to always synchronize_net()
 549                  * to wait for the RX path in case it is using this
 550                  * interface enqueuing frames at this very time on
 551                  * another CPU.
 552                  */
 553                 ieee80211_free_keys(sdata, true);
 554                 skb_queue_purge(&sdata->skb_queue);
 555                 skb_queue_purge(&sdata->status_queue);
 556         }
 557
 558         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 559         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 560                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 561                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 562                         if (info->control.vif == &sdata->vif) {
 563                                 __skb_unlink(skb, &local->pending[i]);
 564                                 ieee80211_free_txskb(&local->hw, skb);
 565                         }
 566                 }
 567         }
 568         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 569
 570         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 571                 ieee80211_txq_remove_vlan(local, sdata);
 572
 573         sdata->bss = NULL;
 574
 575         if (local->open_count == 0)
 576                 ieee80211_clear_tx_pending(local);
 577
 578         sdata->vif.bss_conf.beacon_int = 0;
 579
 580         /*
 581          * If the interface goes down while suspended, presumably because
 582          * the device was unplugged and that happens before our resume,
 583          * then the driver is already unconfigured and the remainder of
 584          * this function isn't needed.
 585          * XXX: what about WoWLAN? If the device has software state, e.g.
 586          *      memory allocated, it might expect teardown commands from
 587          *      mac80211 here?
 588          */
 589         if (local->suspended) {
 590                 WARN_ON(local->wowlan);
 591                 WARN_ON(rcu_access_pointer(local->monitor_sdata));
 592                 return;
 593         }
 594
 595         switch (sdata->vif.type) {
 596         case NL80211_IFTYPE_AP_VLAN:
 597                 break;
 598         case NL80211_IFTYPE_MONITOR:
 599                 if (local->monitors == 0)
 600                         ieee80211_del_virtual_monitor(local);
 601
 602                 mutex_lock(&local->mtx);
 603                 ieee80211_recalc_idle(local);
 604                 mutex_unlock(&local->mtx);
 605
 606                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 607                         break;
 608
 609                 fallthrough;
 610         default:
 611                 if (going_down)
 612                         drv_remove_interface(local, sdata);
 613         }
 614
 615         ieee80211_recalc_ps(local);
 616
 617         if (cancel_scan)
 618                 flush_delayed_work(&local->scan_work);
 619
 620         if (local->open_count == 0) {
 621                 ieee80211_stop_device(local);
 622
 623                 /* no reconfiguring after stop! */
 624                 return;
 625         }
 626
 627         /* do after stop to avoid reconfiguring when we stop anyway */
 628         ieee80211_configure_filter(local);
 629         ieee80211_hw_config(local, hw_reconf_flags);
 630
 631         if (local->monitors == local->open_count)
 632                 ieee80211_add_virtual_monitor(local);
 633 }
 634
 635 static int ieee80211_stop(struct net_device *dev)
 636 {
 637         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 638
 639         /* close all dependent VLAN interfaces before locking wiphy */
 640         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 641                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 642
 643                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 644                                          u.vlan.list)
 645                         dev_close(vlan->dev);
 646         }
 647
 648         wiphy_lock(sdata->local->hw.wiphy);
 649         ieee80211_do_stop(sdata, true);
 650         wiphy_unlock(sdata->local->hw.wiphy);
 651
 652         return 0;
 653 }
 654
 655 static void ieee80211_set_multicast_list(struct net_device *dev)
 656 {
 657         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 658         struct ieee80211_local *local = sdata->local;
 659         int allmulti, sdata_allmulti;
 660
 661         allmulti = !!(dev->flags & IFF_ALLMULTI);
 662         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 663
 664         if (allmulti != sdata_allmulti) {
 665                 if (dev->flags & IFF_ALLMULTI)
 666                         atomic_inc(&local->iff_allmultis);
 667                 else
 668                         atomic_dec(&local->iff_allmultis);
 669                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 670         }
 671
 672         spin_lock_bh(&local->filter_lock);
 673         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 674         spin_unlock_bh(&local->filter_lock);
 675         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 676 }
 677
 678 /*
 679  * Called when the netdev is removed or, by the code below, before
 680  * the interface type changes.
 681  */
 682 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 683 {
 684         /* free extra data */
 685         ieee80211_free_keys(sdata, false);
 686
 687         ieee80211_debugfs_remove_netdev(sdata);
 688
 689         ieee80211_destroy_frag_cache(&sdata->frags);
 690
 691         if (ieee80211_vif_is_mesh(&sdata->vif))
 692                 ieee80211_mesh_teardown_sdata(sdata);
 693 }
 694
 695 static void ieee80211_uninit(struct net_device *dev)
 696 {
 697         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
 698 }
 699
 700 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 701                                          struct sk_buff *skb,
 702                                          struct net_device *sb_dev)
 703 {
 704         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 705 }
 706
 707 static void
 708 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 709 {
 710         dev_fetch_sw_netstats(stats, dev->tstats);
 711 }
 712
 713 static const struct net_device_ops ieee80211_dataif_ops = {
 714         .ndo_open               = ieee80211_open,
 715         .ndo_stop               = ieee80211_stop,
 716         .ndo_uninit             = ieee80211_uninit,
 717         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 718         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 719         .ndo_set_mac_address    = ieee80211_change_mac,
 720         .ndo_select_queue       = ieee80211_netdev_select_queue,
 721         .ndo_get_stats64        = ieee80211_get_stats64,
 722 };
 723
 724 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 725                                           struct sk_buff *skb,
 726                                           struct net_device *sb_dev)
 727 {
 728         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 729         struct ieee80211_local *local = sdata->local;
 730         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 731         struct ieee80211_hdr *hdr;
 732         int len_rthdr;
 733
 734         if (local->hw.queues < IEEE80211_NUM_ACS)
 735                 return 0;
 736
 737         /* reset flags and info before parsing radiotap header */
 738         memset(info, 0, sizeof(*info));
 739
 740         if (!ieee80211_parse_tx_radiotap(skb, dev))
 741                 return 0; /* doesn't matter, frame will be dropped */
 742
 743         len_rthdr = ieee80211_get_radiotap_len(skb->data);
 744         hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
 745         if (skb->len < len_rthdr + 2 ||
 746             skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
 747                 return 0; /* doesn't matter, frame will be dropped */
 748
 749         return ieee80211_select_queue_80211(sdata, skb, hdr);
 750 }
 751
 752 static const struct net_device_ops ieee80211_monitorif_ops = {
 753         .ndo_open               = ieee80211_open,
 754         .ndo_stop               = ieee80211_stop,
 755         .ndo_uninit             = ieee80211_uninit,
 756         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 757         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 758         .ndo_set_mac_address    = ieee80211_change_mac,
 759         .ndo_select_queue       = ieee80211_monitor_select_queue,
 760         .ndo_get_stats64        = ieee80211_get_stats64,
 761 };
 762
 763 static const struct net_device_ops ieee80211_dataif_8023_ops = {
 764         .ndo_open               = ieee80211_open,
 765         .ndo_stop               = ieee80211_stop,
 766         .ndo_uninit             = ieee80211_uninit,
 767         .ndo_start_xmit         = ieee80211_subif_start_xmit_8023,
 768         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 769         .ndo_set_mac_address    = ieee80211_change_mac,
 770         .ndo_select_queue       = ieee80211_netdev_select_queue,
 771         .ndo_get_stats64        = ieee80211_get_stats64,
 772 };
 773
 774 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)
 775 {
 776         switch (iftype) {
 777         /* P2P GO and client are mapped to AP/STATION types */
 778         case NL80211_IFTYPE_AP:
 779         case NL80211_IFTYPE_STATION:
 780                 return true;
 781         default:
 782                 return false;
 783         }
 784 }
 785
 786 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
 787 {
 788         struct ieee80211_local *local = sdata->local;
 789         u32 flags;
 790
 791         flags = sdata->vif.offload_flags;
 792
 793         if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
 794             ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
 795                 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
 796
 797                 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
 798                     local->hw.wiphy->frag_threshold != (u32)-1)
 799                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 800
 801                 if (local->monitors)
 802                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 803         } else {
 804                 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 805         }
 806
 807         if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) &&
 808             ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
 809                 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED;
 810
 811                 if (local->monitors &&
 812                     !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP))
 813                         flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
 814         } else {
 815                 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
 816         }
 817
 818         if (sdata->vif.offload_flags == flags)
 819                 return false;
 820
 821         sdata->vif.offload_flags = flags;
 822         ieee80211_check_fast_rx_iface(sdata);
 823         return true;
 824 }
 825
 826 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
 827 {
 828         struct ieee80211_local *local = sdata->local;
 829         struct ieee80211_sub_if_data *bss = sdata;
 830         bool enabled;
 831
 832         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 833                 if (!sdata->bss)
 834                         return;
 835
 836                 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
 837         }
 838
 839         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
 840             !ieee80211_iftype_supports_hdr_offload(bss->vif.type))
 841                 return;
 842
 843         enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
 844         if (sdata->wdev.use_4addr &&
 845             !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
 846                 enabled = false;
 847
 848         sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
 849                                            &ieee80211_dataif_ops;
 850 }
 851
 852 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
 853 {
 854         struct ieee80211_local *local = sdata->local;
 855         struct ieee80211_sub_if_data *vsdata;
 856
 857         if (ieee80211_set_sdata_offload_flags(sdata)) {
 858                 drv_update_vif_offload(local, sdata);
 859                 ieee80211_set_vif_encap_ops(sdata);
 860         }
 861
 862         list_for_each_entry(vsdata, &local->interfaces, list) {
 863                 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
 864                     vsdata->bss != &sdata->u.ap)
 865                         continue;
 866
 867                 ieee80211_set_vif_encap_ops(vsdata);
 868         }
 869 }
 870
 871 void ieee80211_recalc_offload(struct ieee80211_local *local)
 872 {
 873         struct ieee80211_sub_if_data *sdata;
 874
 875         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
 876                 return;
 877
 878         mutex_lock(&local->iflist_mtx);
 879
 880         list_for_each_entry(sdata, &local->interfaces, list) {
 881                 if (!ieee80211_sdata_running(sdata))
 882                         continue;
 883
 884                 ieee80211_recalc_sdata_offload(sdata);
 885         }
 886
 887         mutex_unlock(&local->iflist_mtx);
 888 }
 889
 890 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 891                                     const int offset)
 892 {
 893         struct ieee80211_local *local = sdata->local;
 894         u32 flags = sdata->u.mntr.flags;
 895
 896 #define ADJUST(_f, _s)  do {                                    \
 897         if (flags & MONITOR_FLAG_##_f)                          \
 898                 local->fif_##_s += offset;                      \
 899         } while (0)
 900
 901         ADJUST(FCSFAIL, fcsfail);
 902         ADJUST(PLCPFAIL, plcpfail);
 903         ADJUST(CONTROL, control);
 904         ADJUST(CONTROL, pspoll);
 905         ADJUST(OTHER_BSS, other_bss);
 906
 907 #undef ADJUST
 908 }
 909
 910 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 911 {
 912         struct ieee80211_local *local = sdata->local;
 913         int i;
 914
 915         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 916                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
 917                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 918                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 919                         sdata->vif.hw_queue[i] = i;
 920                 else
 921                         sdata->vif.hw_queue[i] = 0;
 922         }
 923         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 924 }
 925
 926 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 927 {
 928         struct ieee80211_sub_if_data *sdata;
 929         int ret;
 930
 931         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 932                 return 0;
 933
 934         ASSERT_RTNL();
 935         lockdep_assert_wiphy(local->hw.wiphy);
 936
 937         if (local->monitor_sdata)
 938                 return 0;
 939
 940         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 941         if (!sdata)
 942                 return -ENOMEM;
 943
 944         /* set up data */
 945         sdata->local = local;
 946         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 947         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 948                  wiphy_name(local->hw.wiphy));
 949         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
 950
 951         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 952
 953         ieee80211_set_default_queues(sdata);
 954
 955         ret = drv_add_interface(local, sdata);
 956         if (WARN_ON(ret)) {
 957                 /* ok .. stupid driver, it asked for this! */
 958                 kfree(sdata);
 959                 return ret;
 960         }
 961
 962         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 963
 964         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 965         if (ret) {
 966                 kfree(sdata);
 967                 return ret;
 968         }
 969
 970         mutex_lock(&local->iflist_mtx);
 971         rcu_assign_pointer(local->monitor_sdata, sdata);
 972         mutex_unlock(&local->iflist_mtx);
 973
 974         mutex_lock(&local->mtx);
 975         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 976                                         IEEE80211_CHANCTX_EXCLUSIVE);
 977         mutex_unlock(&local->mtx);
 978         if (ret) {
 979                 mutex_lock(&local->iflist_mtx);
 980                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
 981                 mutex_unlock(&local->iflist_mtx);
 982                 synchronize_net();
 983                 drv_remove_interface(local, sdata);
 984                 kfree(sdata);
 985                 return ret;
 986         }
 987
 988         skb_queue_head_init(&sdata->skb_queue);
 989         skb_queue_head_init(&sdata->status_queue);
 990         INIT_WORK(&sdata->work, ieee80211_iface_work);
 991
 992         return 0;
 993 }
 994
 995 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 996 {
 997         struct ieee80211_sub_if_data *sdata;
 998
 999         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1000                 return;
1001
1002         ASSERT_RTNL();
1003         lockdep_assert_wiphy(local->hw.wiphy);
1004
1005         mutex_lock(&local->iflist_mtx);
1006
1007         sdata = rcu_dereference_protected(local->monitor_sdata,
1008                                           lockdep_is_held(&local->iflist_mtx));
1009         if (!sdata) {
1010                 mutex_unlock(&local->iflist_mtx);
1011                 return;
1012         }
1013
1014         RCU_INIT_POINTER(local->monitor_sdata, NULL);
1015         mutex_unlock(&local->iflist_mtx);
1016
1017         synchronize_net();
1018
1019         mutex_lock(&local->mtx);
1020         ieee80211_vif_release_channel(sdata);
1021         mutex_unlock(&local->mtx);
1022
1023         drv_remove_interface(local, sdata);
1024
1025         kfree(sdata);
1026 }
1027
1028 /*
1029  * NOTE: Be very careful when changing this function, it must NOT return
1030  * an error on interface type changes that have been pre-checked, so most
1031  * checks should be in ieee80211_check_concurrent_iface.
1032  */
1033 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1034 {
1035         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1036         struct net_device *dev = wdev->netdev;
1037         struct ieee80211_local *local = sdata->local;
1038         u32 changed = 0;
1039         int res;
1040         u32 hw_reconf_flags = 0;
1041
1042         switch (sdata->vif.type) {
1043         case NL80211_IFTYPE_AP_VLAN: {
1044                 struct ieee80211_sub_if_data *master;
1045
1046                 if (!sdata->bss)
1047                         return -ENOLINK;
1048
1049                 mutex_lock(&local->mtx);
1050                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1051                 mutex_unlock(&local->mtx);
1052
1053                 master = container_of(sdata->bss,
1054                                       struct ieee80211_sub_if_data, u.ap);
1055                 sdata->control_port_protocol =
1056                         master->control_port_protocol;
1057                 sdata->control_port_no_encrypt =
1058                         master->control_port_no_encrypt;
1059                 sdata->control_port_over_nl80211 =
1060                         master->control_port_over_nl80211;
1061                 sdata->control_port_no_preauth =
1062                         master->control_port_no_preauth;
1063                 sdata->vif.cab_queue = master->vif.cab_queue;
1064                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1065                        sizeof(sdata->vif.hw_queue));
1066                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1067
1068                 mutex_lock(&local->key_mtx);
1069                 sdata->crypto_tx_tailroom_needed_cnt +=
1070                         master->crypto_tx_tailroom_needed_cnt;
1071                 mutex_unlock(&local->key_mtx);
1072
1073                 break;
1074                 }
1075         case NL80211_IFTYPE_AP:
1076                 sdata->bss = &sdata->u.ap;
1077                 break;
1078         case NL80211_IFTYPE_MESH_POINT:
1079         case NL80211_IFTYPE_STATION:
1080         case NL80211_IFTYPE_MONITOR:
1081         case NL80211_IFTYPE_ADHOC:
1082         case NL80211_IFTYPE_P2P_DEVICE:
1083         case NL80211_IFTYPE_OCB:
1084         case NL80211_IFTYPE_NAN:
1085                 /* no special treatment */
1086                 break;
1087         case NL80211_IFTYPE_UNSPECIFIED:
1088         case NUM_NL80211_IFTYPES:
1089         case NL80211_IFTYPE_P2P_CLIENT:
1090         case NL80211_IFTYPE_P2P_GO:
1091         case NL80211_IFTYPE_WDS:
1092                 /* cannot happen */
1093                 WARN_ON(1);
1094                 break;
1095         }
1096
1097         if (local->open_count == 0) {
1098                 res = drv_start(local);
1099                 if (res)
1100                         goto err_del_bss;
1101                 /* we're brought up, everything changes */
1102                 hw_reconf_flags = ~0;
1103                 ieee80211_led_radio(local, true);
1104                 ieee80211_mod_tpt_led_trig(local,
1105                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1106         }
1107
1108         /*
1109          * Copy the hopefully now-present MAC address to
1110          * this interface, if it has the special null one.
1111          */
1112         if (dev && is_zero_ether_addr(dev->dev_addr)) {
1113                 memcpy(dev->dev_addr,
1114                        local->hw.wiphy->perm_addr,
1115                        ETH_ALEN);
1116                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1117
1118                 if (!is_valid_ether_addr(dev->dev_addr)) {
1119                         res = -EADDRNOTAVAIL;
1120                         goto err_stop;
1121                 }
1122         }
1123
1124         switch (sdata->vif.type) {
1125         case NL80211_IFTYPE_AP_VLAN:
1126                 /* no need to tell driver, but set carrier and chanctx */
1127                 if (rtnl_dereference(sdata->bss->beacon)) {
1128                         ieee80211_vif_vlan_copy_chanctx(sdata);
1129                         netif_carrier_on(dev);
1130                         ieee80211_set_vif_encap_ops(sdata);
1131                 } else {
1132                         netif_carrier_off(dev);
1133                 }
1134                 break;
1135         case NL80211_IFTYPE_MONITOR:
1136                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1137                         local->cooked_mntrs++;
1138                         break;
1139                 }
1140
1141                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1142                         res = drv_add_interface(local, sdata);
1143                         if (res)
1144                                 goto err_stop;
1145                 } else if (local->monitors == 0 && local->open_count == 0) {
1146                         res = ieee80211_add_virtual_monitor(local);
1147                         if (res)
1148                                 goto err_stop;
1149                 }
1150
1151                 /* must be before the call to ieee80211_configure_filter */
1152                 local->monitors++;
1153                 if (local->monitors == 1) {
1154                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1155                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1156                 }
1157
1158                 ieee80211_adjust_monitor_flags(sdata, 1);
1159                 ieee80211_configure_filter(local);
1160                 ieee80211_recalc_offload(local);
1161                 mutex_lock(&local->mtx);
1162                 ieee80211_recalc_idle(local);
1163                 mutex_unlock(&local->mtx);
1164
1165                 netif_carrier_on(dev);
1166                 break;
1167         default:
1168                 if (coming_up) {
1169                         ieee80211_del_virtual_monitor(local);
1170                         ieee80211_set_sdata_offload_flags(sdata);
1171
1172                         res = drv_add_interface(local, sdata);
1173                         if (res)
1174                                 goto err_stop;
1175
1176                         ieee80211_set_vif_encap_ops(sdata);
1177                         res = ieee80211_check_queues(sdata,
1178                                 ieee80211_vif_type_p2p(&sdata->vif));
1179                         if (res)
1180                                 goto err_del_interface;
1181                 }
1182
1183                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1184                         local->fif_pspoll++;
1185                         local->fif_probe_req++;
1186
1187                         ieee80211_configure_filter(local);
1188                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1189                         local->fif_probe_req++;
1190                 }
1191
1192                 if (sdata->vif.probe_req_reg)
1193                         drv_config_iface_filter(local, sdata,
1194                                                 FIF_PROBE_REQ,
1195                                                 FIF_PROBE_REQ);
1196
1197                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1198                     sdata->vif.type != NL80211_IFTYPE_NAN)
1199                         changed |= ieee80211_reset_erp_info(sdata);
1200                 ieee80211_bss_info_change_notify(sdata, changed);
1201
1202                 switch (sdata->vif.type) {
1203                 case NL80211_IFTYPE_STATION:
1204                 case NL80211_IFTYPE_ADHOC:
1205                 case NL80211_IFTYPE_AP:
1206                 case NL80211_IFTYPE_MESH_POINT:
1207                 case NL80211_IFTYPE_OCB:
1208                         netif_carrier_off(dev);
1209                         break;
1210                 case NL80211_IFTYPE_P2P_DEVICE:
1211                 case NL80211_IFTYPE_NAN:
1212                         break;
1213                 default:
1214                         /* not reached */
1215                         WARN_ON(1);
1216                 }
1217
1218                 /*
1219                  * Set default queue parameters so drivers don't
1220                  * need to initialise the hardware if the hardware
1221                  * doesn't start up with sane defaults.
1222                  * Enable QoS for anything but station interfaces.
1223                  */
1224                 ieee80211_set_wmm_default(sdata, true,
1225                         sdata->vif.type != NL80211_IFTYPE_STATION);
1226         }
1227
1228         set_bit(SDATA_STATE_RUNNING, &sdata->state);
1229
1230         switch (sdata->vif.type) {
1231         case NL80211_IFTYPE_P2P_DEVICE:
1232                 rcu_assign_pointer(local->p2p_sdata, sdata);
1233                 break;
1234         case NL80211_IFTYPE_MONITOR:
1235                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1236                         break;
1237                 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1238                 break;
1239         default:
1240                 break;
1241         }
1242
1243         /*
1244          * set_multicast_list will be invoked by the networking core
1245          * which will check whether any increments here were done in
1246          * error and sync them down to the hardware as filter flags.
1247          */
1248         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1249                 atomic_inc(&local->iff_allmultis);
1250
1251         if (coming_up)
1252                 local->open_count++;
1253
1254         if (hw_reconf_flags)
1255                 ieee80211_hw_config(local, hw_reconf_flags);
1256
1257         ieee80211_recalc_ps(local);
1258
1259         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1260             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1261             local->ops->wake_tx_queue) {
1262                 /* XXX: for AP_VLAN, actually track AP queues */
1263                 if (dev)
1264                         netif_tx_start_all_queues(dev);
1265         } else if (dev) {
1266                 unsigned long flags;
1267                 int n_acs = IEEE80211_NUM_ACS;
1268                 int ac;
1269
1270                 if (local->hw.queues < IEEE80211_NUM_ACS)
1271                         n_acs = 1;
1272
1273                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1274                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
1275                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
1276                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
1277                         for (ac = 0; ac < n_acs; ac++) {
1278                                 int ac_queue = sdata->vif.hw_queue[ac];
1279
1280                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
1281                                     skb_queue_empty(&local->pending[ac_queue]))
1282                                         netif_start_subqueue(dev, ac);
1283                         }
1284                 }
1285                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1286         }
1287
1288         return 0;
1289  err_del_interface:
1290         drv_remove_interface(local, sdata);
1291  err_stop:
1292         if (!local->open_count)
1293                 drv_stop(local);
1294  err_del_bss:
1295         sdata->bss = NULL;
1296         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1297                 mutex_lock(&local->mtx);
1298                 list_del(&sdata->u.vlan.list);
1299                 mutex_unlock(&local->mtx);
1300         }
1301         /* might already be clear but that doesn't matter */
1302         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1303         return res;
1304 }
1305
1306 static void ieee80211_if_free(struct net_device *dev)
1307 {
1308         free_percpu(dev->tstats);
1309 }
1310
1311 static void ieee80211_if_setup(struct net_device *dev)
1312 {
1313         ether_setup(dev);
1314         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1315         dev->netdev_ops = &ieee80211_dataif_ops;
1316         dev->needs_free_netdev = true;
1317         dev->priv_destructor = ieee80211_if_free;
1318 }
1319
1320 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1321 {
1322         ieee80211_if_setup(dev);
1323         dev->priv_flags |= IFF_NO_QUEUE;
1324 }
1325
1326 static void ieee80211_iface_process_skb(struct ieee80211_local *local,
1327                                         struct ieee80211_sub_if_data *sdata,
1328                                         struct sk_buff *skb)
1329 {
1330         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1331
1332         if (ieee80211_is_action(mgmt->frame_control) &&
1333             mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1334                 struct sta_info *sta;
1335                 int len = skb->len;
1336
1337                 mutex_lock(&local->sta_mtx);
1338                 sta = sta_info_get_bss(sdata, mgmt->sa);
1339                 if (sta) {
1340                         switch (mgmt->u.action.u.addba_req.action_code) {
1341                         case WLAN_ACTION_ADDBA_REQ:
1342                                 ieee80211_process_addba_request(local, sta,
1343                                                                 mgmt, len);
1344                                 break;
1345                         case WLAN_ACTION_ADDBA_RESP:
1346                                 ieee80211_process_addba_resp(local, sta,
1347                                                              mgmt, len);
1348                                 break;
1349                         case WLAN_ACTION_DELBA:
1350                                 ieee80211_process_delba(sdata, sta,
1351                                                         mgmt, len);
1352                                 break;
1353                         default:
1354                                 WARN_ON(1);
1355                                 break;
1356                         }
1357                 }
1358                 mutex_unlock(&local->sta_mtx);
1359         } else if (ieee80211_is_action(mgmt->frame_control) &&
1360                    mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1361                 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1362                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1363                         struct ieee80211_rx_status *status;
1364                         enum nl80211_band band;
1365                         struct sta_info *sta;
1366                         u8 opmode;
1367
1368                         status = IEEE80211_SKB_RXCB(skb);
1369                         band = status->band;
1370                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1371
1372                         mutex_lock(&local->sta_mtx);
1373                         sta = sta_info_get_bss(sdata, mgmt->sa);
1374
1375                         if (sta)
1376                                 ieee80211_vht_handle_opmode(sdata, sta, opmode,
1377                                                             band);
1378
1379                         mutex_unlock(&local->sta_mtx);
1380                         break;
1381                 }
1382                 case WLAN_VHT_ACTION_GROUPID_MGMT:
1383                         ieee80211_process_mu_groups(sdata, mgmt);
1384                         break;
1385                 default:
1386                         WARN_ON(1);
1387                         break;
1388                 }
1389         } else if (ieee80211_is_action(mgmt->frame_control) &&
1390                    mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1391                 switch (mgmt->u.action.u.s1g.action_code) {
1392                 case WLAN_S1G_TWT_TEARDOWN:
1393                 case WLAN_S1G_TWT_SETUP:
1394                         ieee80211_s1g_rx_twt_action(sdata, skb);
1395                         break;
1396                 default:
1397                         break;
1398                 }
1399         } else if (ieee80211_is_ext(mgmt->frame_control)) {
1400                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1401                         ieee80211_sta_rx_queued_ext(sdata, skb);
1402                 else
1403                         WARN_ON(1);
1404         } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1405                 struct ieee80211_hdr *hdr = (void *)mgmt;
1406                 struct sta_info *sta;
1407
1408                 /*
1409                  * So the frame isn't mgmt, but frame_control
1410                  * is at the right place anyway, of course, so
1411                  * the if statement is correct.
1412                  *
1413                  * Warn if we have other data frame types here,
1414                  * they must not get here.
1415                  */
1416                 WARN_ON(hdr->frame_control &
1417                                 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1418                 WARN_ON(!(hdr->seq_ctrl &
1419                                 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1420                 /*
1421                  * This was a fragment of a frame, received while
1422                  * a block-ack session was active. That cannot be
1423                  * right, so terminate the session.
1424                  */
1425                 mutex_lock(&local->sta_mtx);
1426                 sta = sta_info_get_bss(sdata, mgmt->sa);
1427                 if (sta) {
1428                         u16 tid = ieee80211_get_tid(hdr);
1429
1430                         __ieee80211_stop_rx_ba_session(
1431                                 sta, tid, WLAN_BACK_RECIPIENT,
1432                                 WLAN_REASON_QSTA_REQUIRE_SETUP,
1433                                 true);
1434                 }
1435                 mutex_unlock(&local->sta_mtx);
1436         } else switch (sdata->vif.type) {
1437         case NL80211_IFTYPE_STATION:
1438                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1439                 break;
1440         case NL80211_IFTYPE_ADHOC:
1441                 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1442                 break;
1443         case NL80211_IFTYPE_MESH_POINT:
1444                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1445                         break;
1446                 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1447                 break;
1448         default:
1449                 WARN(1, "frame for unexpected interface type");
1450                 break;
1451         }
1452 }
1453
1454 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata,
1455                                            struct sk_buff *skb)
1456 {
1457         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1458
1459         if (ieee80211_is_action(mgmt->frame_control) &&
1460             mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1461                 switch (mgmt->u.action.u.s1g.action_code) {
1462                 case WLAN_S1G_TWT_TEARDOWN:
1463                 case WLAN_S1G_TWT_SETUP:
1464                         ieee80211_s1g_status_twt_action(sdata, skb);
1465                         break;
1466                 default:
1467                         break;
1468                 }
1469         }
1470 }
1471
1472 static void ieee80211_iface_work(struct work_struct *work)
1473 {
1474         struct ieee80211_sub_if_data *sdata =
1475                 container_of(work, struct ieee80211_sub_if_data, work);
1476         struct ieee80211_local *local = sdata->local;
1477         struct sk_buff *skb;
1478
1479         if (!ieee80211_sdata_running(sdata))
1480                 return;
1481
1482         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1483                 return;
1484
1485         if (!ieee80211_can_run_worker(local))
1486                 return;
1487
1488         /* first process frames */
1489         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1490                 kcov_remote_start_common(skb_get_kcov_handle(skb));
1491
1492                 if (skb->protocol == cpu_to_be16(ETH_P_TDLS))
1493                         ieee80211_process_tdls_channel_switch(sdata, skb);
1494                 else
1495                         ieee80211_iface_process_skb(local, sdata, skb);
1496
1497                 kfree_skb(skb);
1498                 kcov_remote_stop();
1499         }
1500
1501         /* process status queue */
1502         while ((skb = skb_dequeue(&sdata->status_queue))) {
1503                 kcov_remote_start_common(skb_get_kcov_handle(skb));
1504
1505                 ieee80211_iface_process_status(sdata, skb);
1506                 kfree_skb(skb);
1507
1508                 kcov_remote_stop();
1509         }
1510
1511         /* then other type-dependent work */
1512         switch (sdata->vif.type) {
1513         case NL80211_IFTYPE_STATION:
1514                 ieee80211_sta_work(sdata);
1515                 break;
1516         case NL80211_IFTYPE_ADHOC:
1517                 ieee80211_ibss_work(sdata);
1518                 break;
1519         case NL80211_IFTYPE_MESH_POINT:
1520                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1521                         break;
1522                 ieee80211_mesh_work(sdata);
1523                 break;
1524         case NL80211_IFTYPE_OCB:
1525                 ieee80211_ocb_work(sdata);
1526                 break;
1527         default:
1528                 break;
1529         }
1530 }
1531
1532 static void ieee80211_recalc_smps_work(struct work_struct *work)
1533 {
1534         struct ieee80211_sub_if_data *sdata =
1535                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1536
1537         ieee80211_recalc_smps(sdata);
1538 }
1539
1540 /*
1541  * Helper function to initialise an interface to a specific type.
1542  */
1543 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1544                                   enum nl80211_iftype type)
1545 {
1546         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1547                                                     0xff, 0xff, 0xff};
1548
1549         /* clear type-dependent union */
1550         memset(&sdata->u, 0, sizeof(sdata->u));
1551
1552         /* and set some type-dependent values */
1553         sdata->vif.type = type;
1554         sdata->vif.p2p = false;
1555         sdata->wdev.iftype = type;
1556
1557         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1558         sdata->control_port_no_encrypt = false;
1559         sdata->control_port_over_nl80211 = false;
1560         sdata->control_port_no_preauth = false;
1561         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1562         sdata->vif.bss_conf.idle = true;
1563         sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1564
1565         sdata->noack_map = 0;
1566
1567         /* only monitor/p2p-device differ */
1568         if (sdata->dev) {
1569                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1570                 sdata->dev->type = ARPHRD_ETHER;
1571         }
1572
1573         skb_queue_head_init(&sdata->skb_queue);
1574         skb_queue_head_init(&sdata->status_queue);
1575         INIT_WORK(&sdata->work, ieee80211_iface_work);
1576         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1577         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1578         INIT_WORK(&sdata->color_change_finalize_work, ieee80211_color_change_finalize_work);
1579         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1580         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1581
1582         switch (type) {
1583         case NL80211_IFTYPE_P2P_GO:
1584                 type = NL80211_IFTYPE_AP;
1585                 sdata->vif.type = type;
1586                 sdata->vif.p2p = true;
1587                 fallthrough;
1588         case NL80211_IFTYPE_AP:
1589                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1590                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1591                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1592                 break;
1593         case NL80211_IFTYPE_P2P_CLIENT:
1594                 type = NL80211_IFTYPE_STATION;
1595                 sdata->vif.type = type;
1596                 sdata->vif.p2p = true;
1597                 fallthrough;
1598         case NL80211_IFTYPE_STATION:
1599                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1600                 ieee80211_sta_setup_sdata(sdata);
1601                 break;
1602         case NL80211_IFTYPE_OCB:
1603                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1604                 ieee80211_ocb_setup_sdata(sdata);
1605                 break;
1606         case NL80211_IFTYPE_ADHOC:
1607                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1608                 ieee80211_ibss_setup_sdata(sdata);
1609                 break;
1610         case NL80211_IFTYPE_MESH_POINT:
1611                 if (ieee80211_vif_is_mesh(&sdata->vif))
1612                         ieee80211_mesh_init_sdata(sdata);
1613                 break;
1614         case NL80211_IFTYPE_MONITOR:
1615                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1616                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1617                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1618                                       MONITOR_FLAG_OTHER_BSS;
1619                 break;
1620         case NL80211_IFTYPE_NAN:
1621                 idr_init(&sdata->u.nan.function_inst_ids);
1622                 spin_lock_init(&sdata->u.nan.func_lock);
1623                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1624                 break;
1625         case NL80211_IFTYPE_AP_VLAN:
1626         case NL80211_IFTYPE_P2P_DEVICE:
1627                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1628                 break;
1629         case NL80211_IFTYPE_UNSPECIFIED:
1630         case NL80211_IFTYPE_WDS:
1631         case NUM_NL80211_IFTYPES:
1632                 WARN_ON(1);
1633                 break;
1634         }
1635
1636         ieee80211_debugfs_add_netdev(sdata);
1637 }
1638
1639 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1640                                            enum nl80211_iftype type)
1641 {
1642         struct ieee80211_local *local = sdata->local;
1643         int ret, err;
1644         enum nl80211_iftype internal_type = type;
1645         bool p2p = false;
1646
1647         ASSERT_RTNL();
1648
1649         if (!local->ops->change_interface)
1650                 return -EBUSY;
1651
1652         switch (sdata->vif.type) {
1653         case NL80211_IFTYPE_AP:
1654                 if (!list_empty(&sdata->u.ap.vlans))
1655                         return -EBUSY;
1656                 break;
1657         case NL80211_IFTYPE_STATION:
1658         case NL80211_IFTYPE_ADHOC:
1659         case NL80211_IFTYPE_OCB:
1660                 /*
1661                  * Could maybe also all others here?
1662                  * Just not sure how that interacts
1663                  * with the RX/config path e.g. for
1664                  * mesh.
1665                  */
1666                 break;
1667         default:
1668                 return -EBUSY;
1669         }
1670
1671         switch (type) {
1672         case NL80211_IFTYPE_AP:
1673         case NL80211_IFTYPE_STATION:
1674         case NL80211_IFTYPE_ADHOC:
1675         case NL80211_IFTYPE_OCB:
1676                 /*
1677                  * Could probably support everything
1678                  * but here.
1679                  */
1680                 break;
1681         case NL80211_IFTYPE_P2P_CLIENT:
1682                 p2p = true;
1683                 internal_type = NL80211_IFTYPE_STATION;
1684                 break;
1685         case NL80211_IFTYPE_P2P_GO:
1686                 p2p = true;
1687                 internal_type = NL80211_IFTYPE_AP;
1688                 break;
1689         default:
1690                 return -EBUSY;
1691         }
1692
1693         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1694         if (ret)
1695                 return ret;
1696
1697         ieee80211_stop_vif_queues(local, sdata,
1698                                   IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1699         synchronize_net();
1700
1701         ieee80211_do_stop(sdata, false);
1702
1703         ieee80211_teardown_sdata(sdata);
1704
1705         ieee80211_set_sdata_offload_flags(sdata);
1706         ret = drv_change_interface(local, sdata, internal_type, p2p);
1707         if (ret)
1708                 type = ieee80211_vif_type_p2p(&sdata->vif);
1709
1710         /*
1711          * Ignore return value here, there's not much we can do since
1712          * the driver changed the interface type internally already.
1713          * The warnings will hopefully make driver authors fix it :-)
1714          */
1715         ieee80211_check_queues(sdata, type);
1716
1717         ieee80211_setup_sdata(sdata, type);
1718         ieee80211_set_vif_encap_ops(sdata);
1719
1720         err = ieee80211_do_open(&sdata->wdev, false);
1721         WARN(err, "type change: do_open returned %d", err);
1722
1723         ieee80211_wake_vif_queues(local, sdata,
1724                                   IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1725         return ret;
1726 }
1727
1728 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1729                              enum nl80211_iftype type)
1730 {
1731         int ret;
1732
1733         ASSERT_RTNL();
1734
1735         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1736                 return 0;
1737
1738         if (ieee80211_sdata_running(sdata)) {
1739                 ret = ieee80211_runtime_change_iftype(sdata, type);
1740                 if (ret)
1741                         return ret;
1742         } else {
1743                 /* Purge and reset type-dependent state. */
1744                 ieee80211_teardown_sdata(sdata);
1745                 ieee80211_setup_sdata(sdata, type);
1746         }
1747
1748         /* reset some values that shouldn't be kept across type changes */
1749         if (type == NL80211_IFTYPE_STATION)
1750                 sdata->u.mgd.use_4addr = false;
1751
1752         return 0;
1753 }
1754
1755 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1756                                        u8 *perm_addr, enum nl80211_iftype type)
1757 {
1758         struct ieee80211_sub_if_data *sdata;
1759         u64 mask, start, addr, val, inc;
1760         u8 *m;
1761         u8 tmp_addr[ETH_ALEN];
1762         int i;
1763
1764         /* default ... something at least */
1765         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1766
1767         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1768             local->hw.wiphy->n_addresses <= 1)
1769                 return;
1770
1771         mutex_lock(&local->iflist_mtx);
1772
1773         switch (type) {
1774         case NL80211_IFTYPE_MONITOR:
1775                 /* doesn't matter */
1776                 break;
1777         case NL80211_IFTYPE_AP_VLAN:
1778                 /* match up with an AP interface */
1779                 list_for_each_entry(sdata, &local->interfaces, list) {
1780                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1781                                 continue;
1782                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1783                         break;
1784                 }
1785                 /* keep default if no AP interface present */
1786                 break;
1787         case NL80211_IFTYPE_P2P_CLIENT:
1788         case NL80211_IFTYPE_P2P_GO:
1789                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1790                         list_for_each_entry(sdata, &local->interfaces, list) {
1791                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1792                                         continue;
1793                                 if (!ieee80211_sdata_running(sdata))
1794                                         continue;
1795                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1796                                 goto out_unlock;
1797                         }
1798                 }
1799                 fallthrough;
1800         default:
1801                 /* assign a new address if possible -- try n_addresses first */
1802                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1803                         bool used = false;
1804
1805                         list_for_each_entry(sdata, &local->interfaces, list) {
1806                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1807                                                      sdata->vif.addr)) {
1808                                         used = true;
1809                                         break;
1810                                 }
1811                         }
1812
1813                         if (!used) {
1814                                 memcpy(perm_addr,
1815                                        local->hw.wiphy->addresses[i].addr,
1816                                        ETH_ALEN);
1817                                 break;
1818                         }
1819                 }
1820
1821                 /* try mask if available */
1822                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1823                         break;
1824
1825                 m = local->hw.wiphy->addr_mask;
1826                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1827                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1828                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1829
1830                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1831                         /* not a contiguous mask ... not handled now! */
1832                         pr_info("not contiguous\n");
1833                         break;
1834                 }
1835
1836                 /*
1837                  * Pick address of existing interface in case user changed
1838                  * MAC address manually, default to perm_addr.
1839                  */
1840                 m = local->hw.wiphy->perm_addr;
1841                 list_for_each_entry(sdata, &local->interfaces, list) {
1842                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1843                                 continue;
1844                         m = sdata->vif.addr;
1845                         break;
1846                 }
1847                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1848                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1849                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1850
1851                 inc = 1ULL<<__ffs64(mask);
1852                 val = (start & mask);
1853                 addr = (start & ~mask) | (val & mask);
1854                 do {
1855                         bool used = false;
1856
1857                         tmp_addr[5] = addr >> 0*8;
1858                         tmp_addr[4] = addr >> 1*8;
1859                         tmp_addr[3] = addr >> 2*8;
1860                         tmp_addr[2] = addr >> 3*8;
1861                         tmp_addr[1] = addr >> 4*8;
1862                         tmp_addr[0] = addr >> 5*8;
1863
1864                         val += inc;
1865
1866                         list_for_each_entry(sdata, &local->interfaces, list) {
1867                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1868                                         used = true;
1869                                         break;
1870                                 }
1871                         }
1872
1873                         if (!used) {
1874                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1875                                 break;
1876                         }
1877                         addr = (start & ~mask) | (val & mask);
1878                 } while (addr != start);
1879
1880                 break;
1881         }
1882
1883  out_unlock:
1884         mutex_unlock(&local->iflist_mtx);
1885 }
1886
1887 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1888                      unsigned char name_assign_type,
1889                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1890                      struct vif_params *params)
1891 {
1892         struct net_device *ndev = NULL;
1893         struct ieee80211_sub_if_data *sdata = NULL;
1894         struct txq_info *txqi;
1895         void (*if_setup)(struct net_device *dev);
1896         int ret, i;
1897         int txqs = 1;
1898
1899         ASSERT_RTNL();
1900
1901         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1902                 struct wireless_dev *wdev;
1903
1904                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1905                                 GFP_KERNEL);
1906                 if (!sdata)
1907                         return -ENOMEM;
1908                 wdev = &sdata->wdev;
1909
1910                 sdata->dev = NULL;
1911                 strlcpy(sdata->name, name, IFNAMSIZ);
1912                 ieee80211_assign_perm_addr(local, wdev->address, type);
1913                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1914         } else {
1915                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1916                                  sizeof(void *));
1917                 int txq_size = 0;
1918
1919                 if (local->ops->wake_tx_queue &&
1920                     type != NL80211_IFTYPE_AP_VLAN &&
1921                     (type != NL80211_IFTYPE_MONITOR ||
1922                      (params->flags & MONITOR_FLAG_ACTIVE)))
1923                         txq_size += sizeof(struct txq_info) +
1924                                     local->hw.txq_data_size;
1925
1926                 if (local->ops->wake_tx_queue) {
1927                         if_setup = ieee80211_if_setup_no_queue;
1928                 } else {
1929                         if_setup = ieee80211_if_setup;
1930                         if (local->hw.queues >= IEEE80211_NUM_ACS)
1931                                 txqs = IEEE80211_NUM_ACS;
1932                 }
1933
1934                 ndev = alloc_netdev_mqs(size + txq_size,
1935                                         name, name_assign_type,
1936                                         if_setup, txqs, 1);
1937                 if (!ndev)
1938                         return -ENOMEM;
1939
1940                 if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len)
1941                         ndev->tx_queue_len = local->hw.wiphy->tx_queue_len;
1942
1943                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1944
1945                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1946                 if (!ndev->tstats) {
1947                         free_netdev(ndev);
1948                         return -ENOMEM;
1949                 }
1950
1951                 ndev->needed_headroom = local->tx_headroom +
1952                                         4*6 /* four MAC addresses */
1953                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1954                                         + 6 /* mesh */
1955                                         + 8 /* rfc1042/bridge tunnel */
1956                                         - ETH_HLEN /* ethernet hard_header_len */
1957                                         + IEEE80211_ENCRYPT_HEADROOM;
1958                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1959
1960                 ret = dev_alloc_name(ndev, ndev->name);
1961                 if (ret < 0) {
1962                         ieee80211_if_free(ndev);
1963                         free_netdev(ndev);
1964                         return ret;
1965                 }
1966
1967                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1968                 if (is_valid_ether_addr(params->macaddr))
1969                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1970                 else
1971                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1972                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1973
1974                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1975                 sdata = netdev_priv(ndev);
1976                 ndev->ieee80211_ptr = &sdata->wdev;
1977                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1978                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1979
1980                 if (txq_size) {
1981                         txqi = netdev_priv(ndev) + size;
1982                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1983                 }
1984
1985                 sdata->dev = ndev;
1986         }
1987
1988         /* initialise type-independent data */
1989         sdata->wdev.wiphy = local->hw.wiphy;
1990         sdata->local = local;
1991
1992         ieee80211_init_frag_cache(&sdata->frags);
1993
1994         INIT_LIST_HEAD(&sdata->key_list);
1995
1996         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1997                           ieee80211_dfs_cac_timer_work);
1998         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1999                           ieee80211_delayed_tailroom_dec);
2000
2001         for (i = 0; i < NUM_NL80211_BANDS; i++) {
2002                 struct ieee80211_supported_band *sband;
2003                 sband = local->hw.wiphy->bands[i];
2004                 sdata->rc_rateidx_mask[i] =
2005                         sband ? (1 << sband->n_bitrates) - 1 : 0;
2006                 if (sband) {
2007                         __le16 cap;
2008                         u16 *vht_rate_mask;
2009
2010                         memcpy(sdata->rc_rateidx_mcs_mask[i],
2011                                sband->ht_cap.mcs.rx_mask,
2012                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
2013
2014                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
2015                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
2016                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
2017                 } else {
2018                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
2019                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
2020                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
2021                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
2022                 }
2023         }
2024
2025         for (i = 0; i < IEEE80211_NUM_ACS; i++)
2026                 init_airtime_info(&sdata->airtime[i], &local->airtime[i]);
2027
2028         ieee80211_set_default_queues(sdata);
2029
2030         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2031         sdata->user_power_level = local->user_power_level;
2032
2033         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2034
2035         /* setup type-dependent data */
2036         ieee80211_setup_sdata(sdata, type);
2037
2038         if (ndev) {
2039                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
2040                 if (type == NL80211_IFTYPE_STATION)
2041                         sdata->u.mgd.use_4addr = params->use_4addr;
2042
2043                 ndev->features |= local->hw.netdev_features;
2044                 ndev->hw_features |= ndev->features &
2045                                         MAC80211_SUPPORTED_FEATURES_TX;
2046
2047                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
2048
2049                 /* MTU range is normally 256 - 2304, where the upper limit is
2050                  * the maximum MSDU size. Monitor interfaces send and receive
2051                  * MPDU and A-MSDU frames which may be much larger so we do
2052                  * not impose an upper limit in that case.
2053                  */
2054                 ndev->min_mtu = 256;
2055                 if (type == NL80211_IFTYPE_MONITOR)
2056                         ndev->max_mtu = 0;
2057                 else
2058                         ndev->max_mtu = local->hw.max_mtu;
2059
2060                 ret = cfg80211_register_netdevice(ndev);
2061                 if (ret) {
2062                         free_netdev(ndev);
2063                         return ret;
2064                 }
2065         }
2066
2067         mutex_lock(&local->iflist_mtx);
2068         list_add_tail_rcu(&sdata->list, &local->interfaces);
2069         mutex_unlock(&local->iflist_mtx);
2070
2071         if (new_wdev)
2072                 *new_wdev = &sdata->wdev;
2073
2074         return 0;
2075 }
2076
2077 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2078 {
2079         ASSERT_RTNL();
2080
2081         mutex_lock(&sdata->local->iflist_mtx);
2082         list_del_rcu(&sdata->list);
2083         mutex_unlock(&sdata->local->iflist_mtx);
2084
2085         if (sdata->vif.txq)
2086                 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2087
2088         synchronize_rcu();
2089
2090         cfg80211_unregister_wdev(&sdata->wdev);
2091
2092         if (!sdata->dev) {
2093                 ieee80211_teardown_sdata(sdata);
2094                 kfree(sdata);
2095         }
2096 }
2097
2098 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2099 {
2100         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2101                 return;
2102         ieee80211_do_stop(sdata, true);
2103 }
2104
2105 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2106 {
2107         struct ieee80211_sub_if_data *sdata, *tmp;
2108         LIST_HEAD(unreg_list);
2109         LIST_HEAD(wdev_list);
2110
2111         ASSERT_RTNL();
2112
2113         /* Before destroying the interfaces, make sure they're all stopped so
2114          * that the hardware is stopped. Otherwise, the driver might still be
2115          * iterating the interfaces during the shutdown, e.g. from a worker
2116          * or from RX processing or similar, and if it does so (using atomic
2117          * iteration) while we're manipulating the list, the iteration will
2118          * crash.
2119          *
2120          * After this, the hardware should be stopped and the driver should
2121          * have stopped all of its activities, so that we can do RCU-unaware
2122          * manipulations of the interface list below.
2123          */
2124         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2125
2126         WARN(local->open_count, "%s: open count remains %d\n",
2127              wiphy_name(local->hw.wiphy), local->open_count);
2128
2129         ieee80211_txq_teardown_flows(local);
2130
2131         mutex_lock(&local->iflist_mtx);
2132         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
2133                 list_del(&sdata->list);
2134
2135                 if (sdata->dev)
2136                         unregister_netdevice_queue(sdata->dev, &unreg_list);
2137                 else
2138                         list_add(&sdata->list, &wdev_list);
2139         }
2140         mutex_unlock(&local->iflist_mtx);
2141
2142         unregister_netdevice_many(&unreg_list);
2143
2144         wiphy_lock(local->hw.wiphy);
2145         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2146                 list_del(&sdata->list);
2147                 cfg80211_unregister_wdev(&sdata->wdev);
2148                 kfree(sdata);
2149         }
2150         wiphy_unlock(local->hw.wiphy);
2151 }
2152
2153 static int netdev_notify(struct notifier_block *nb,
2154                          unsigned long state, void *ptr)
2155 {
2156         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2157         struct ieee80211_sub_if_data *sdata;
2158
2159         if (state != NETDEV_CHANGENAME)
2160                 return NOTIFY_DONE;
2161
2162         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2163                 return NOTIFY_DONE;
2164
2165         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2166                 return NOTIFY_DONE;
2167
2168         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2169         memcpy(sdata->name, dev->name, IFNAMSIZ);
2170         ieee80211_debugfs_rename_netdev(sdata);
2171
2172         return NOTIFY_OK;
2173 }
2174
2175 static struct notifier_block mac80211_netdev_notifier = {
2176         .notifier_call = netdev_notify,
2177 };
2178
2179 int ieee80211_iface_init(void)
2180 {
2181         return register_netdevice_notifier(&mac80211_netdev_notifier);
2182 }
2183
2184 void ieee80211_iface_exit(void)
2185 {
2186         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2187 }
2188
2189 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2190 {
2191         if (sdata->vif.type == NL80211_IFTYPE_AP)
2192                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2193         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2194                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2195 }
2196
2197 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2198 {
2199         if (sdata->vif.type == NL80211_IFTYPE_AP)
2200                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2201         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2202                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2203 }