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 void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata)
 636 {
 637         struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata;
 638         struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif;
 639
 640         if (!tx_vif)
 641                 return;
 642
 643         tx_sdata = vif_to_sdata(tx_vif);
 644         sdata->vif.mbssid_tx_vif = NULL;
 645
 646         list_for_each_entry_safe(non_tx_sdata, tmp_sdata,
 647                                  &tx_sdata->local->interfaces, list) {
 648                 if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata &&
 649                     non_tx_sdata->vif.mbssid_tx_vif == tx_vif &&
 650                     ieee80211_sdata_running(non_tx_sdata)) {
 651                         non_tx_sdata->vif.mbssid_tx_vif = NULL;
 652                         dev_close(non_tx_sdata->wdev.netdev);
 653                 }
 654         }
 655
 656         if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) {
 657                 tx_sdata->vif.mbssid_tx_vif = NULL;
 658                 dev_close(tx_sdata->wdev.netdev);
 659         }
 660 }
 661
 662 static int ieee80211_stop(struct net_device *dev)
 663 {
 664         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 665
 666         /* close dependent VLAN and MBSSID interfaces before locking wiphy */
 667         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 668                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 669
 670                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 671                                          u.vlan.list)
 672                         dev_close(vlan->dev);
 673
 674                 ieee80211_stop_mbssid(sdata);
 675         }
 676
 677         wiphy_lock(sdata->local->hw.wiphy);
 678         ieee80211_do_stop(sdata, true);
 679         wiphy_unlock(sdata->local->hw.wiphy);
 680
 681         return 0;
 682 }
 683
 684 static void ieee80211_set_multicast_list(struct net_device *dev)
 685 {
 686         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 687         struct ieee80211_local *local = sdata->local;
 688         int allmulti, sdata_allmulti;
 689
 690         allmulti = !!(dev->flags & IFF_ALLMULTI);
 691         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 692
 693         if (allmulti != sdata_allmulti) {
 694                 if (dev->flags & IFF_ALLMULTI)
 695                         atomic_inc(&local->iff_allmultis);
 696                 else
 697                         atomic_dec(&local->iff_allmultis);
 698                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 699         }
 700
 701         spin_lock_bh(&local->filter_lock);
 702         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 703         spin_unlock_bh(&local->filter_lock);
 704         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 705 }
 706
 707 /*
 708  * Called when the netdev is removed or, by the code below, before
 709  * the interface type changes.
 710  */
 711 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 712 {
 713         /* free extra data */
 714         ieee80211_free_keys(sdata, false);
 715
 716         ieee80211_debugfs_remove_netdev(sdata);
 717
 718         ieee80211_destroy_frag_cache(&sdata->frags);
 719
 720         if (ieee80211_vif_is_mesh(&sdata->vif))
 721                 ieee80211_mesh_teardown_sdata(sdata);
 722 }
 723
 724 static void ieee80211_uninit(struct net_device *dev)
 725 {
 726         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
 727 }
 728
 729 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 730                                          struct sk_buff *skb,
 731                                          struct net_device *sb_dev)
 732 {
 733         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 734 }
 735
 736 static void
 737 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 738 {
 739         dev_fetch_sw_netstats(stats, dev->tstats);
 740 }
 741
 742 static const struct net_device_ops ieee80211_dataif_ops = {
 743         .ndo_open               = ieee80211_open,
 744         .ndo_stop               = ieee80211_stop,
 745         .ndo_uninit             = ieee80211_uninit,
 746         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 747         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 748         .ndo_set_mac_address    = ieee80211_change_mac,
 749         .ndo_select_queue       = ieee80211_netdev_select_queue,
 750         .ndo_get_stats64        = ieee80211_get_stats64,
 751 };
 752
 753 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 754                                           struct sk_buff *skb,
 755                                           struct net_device *sb_dev)
 756 {
 757         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 758         struct ieee80211_local *local = sdata->local;
 759         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 760         struct ieee80211_hdr *hdr;
 761         int len_rthdr;
 762
 763         if (local->hw.queues < IEEE80211_NUM_ACS)
 764                 return 0;
 765
 766         /* reset flags and info before parsing radiotap header */
 767         memset(info, 0, sizeof(*info));
 768
 769         if (!ieee80211_parse_tx_radiotap(skb, dev))
 770                 return 0; /* doesn't matter, frame will be dropped */
 771
 772         len_rthdr = ieee80211_get_radiotap_len(skb->data);
 773         hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
 774         if (skb->len < len_rthdr + 2 ||
 775             skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
 776                 return 0; /* doesn't matter, frame will be dropped */
 777
 778         return ieee80211_select_queue_80211(sdata, skb, hdr);
 779 }
 780
 781 static const struct net_device_ops ieee80211_monitorif_ops = {
 782         .ndo_open               = ieee80211_open,
 783         .ndo_stop               = ieee80211_stop,
 784         .ndo_uninit             = ieee80211_uninit,
 785         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 786         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 787         .ndo_set_mac_address    = ieee80211_change_mac,
 788         .ndo_select_queue       = ieee80211_monitor_select_queue,
 789         .ndo_get_stats64        = ieee80211_get_stats64,
 790 };
 791
 792 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx,
 793                                               struct net_device_path *path)
 794 {
 795         struct ieee80211_sub_if_data *sdata;
 796         struct ieee80211_local *local;
 797         struct sta_info *sta;
 798         int ret = -ENOENT;
 799
 800         sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev);
 801         local = sdata->local;
 802
 803         if (!local->ops->net_fill_forward_path)
 804                 return -EOPNOTSUPP;
 805
 806         rcu_read_lock();
 807         switch (sdata->vif.type) {
 808         case NL80211_IFTYPE_AP_VLAN:
 809                 sta = rcu_dereference(sdata->u.vlan.sta);
 810                 if (sta)
 811                         break;
 812                 if (sdata->wdev.use_4addr)
 813                         goto out;
 814                 if (is_multicast_ether_addr(ctx->daddr))
 815                         goto out;
 816                 sta = sta_info_get_bss(sdata, ctx->daddr);
 817                 break;
 818         case NL80211_IFTYPE_AP:
 819                 if (is_multicast_ether_addr(ctx->daddr))
 820                         goto out;
 821                 sta = sta_info_get(sdata, ctx->daddr);
 822                 break;
 823         case NL80211_IFTYPE_STATION:
 824                 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
 825                         sta = sta_info_get(sdata, ctx->daddr);
 826                         if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
 827                                 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
 828                                         goto out;
 829
 830                                 break;
 831                         }
 832                 }
 833
 834                 sta = sta_info_get(sdata, sdata->u.mgd.bssid);
 835                 break;
 836         default:
 837                 goto out;
 838         }
 839
 840         if (!sta)
 841                 goto out;
 842
 843         ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path);
 844 out:
 845         rcu_read_unlock();
 846
 847         return ret;
 848 }
 849
 850 static const struct net_device_ops ieee80211_dataif_8023_ops = {
 851         .ndo_open               = ieee80211_open,
 852         .ndo_stop               = ieee80211_stop,
 853         .ndo_uninit             = ieee80211_uninit,
 854         .ndo_start_xmit         = ieee80211_subif_start_xmit_8023,
 855         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 856         .ndo_set_mac_address    = ieee80211_change_mac,
 857         .ndo_select_queue       = ieee80211_netdev_select_queue,
 858         .ndo_get_stats64        = ieee80211_get_stats64,
 859         .ndo_fill_forward_path  = ieee80211_netdev_fill_forward_path,
 860 };
 861
 862 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)
 863 {
 864         switch (iftype) {
 865         /* P2P GO and client are mapped to AP/STATION types */
 866         case NL80211_IFTYPE_AP:
 867         case NL80211_IFTYPE_STATION:
 868                 return true;
 869         default:
 870                 return false;
 871         }
 872 }
 873
 874 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
 875 {
 876         struct ieee80211_local *local = sdata->local;
 877         u32 flags;
 878
 879         flags = sdata->vif.offload_flags;
 880
 881         if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
 882             ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
 883                 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
 884
 885                 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
 886                     local->hw.wiphy->frag_threshold != (u32)-1)
 887                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 888
 889                 if (local->monitors)
 890                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 891         } else {
 892                 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 893         }
 894
 895         if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) &&
 896             ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
 897                 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED;
 898
 899                 if (local->monitors &&
 900                     !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP))
 901                         flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
 902         } else {
 903                 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
 904         }
 905
 906         if (sdata->vif.offload_flags == flags)
 907                 return false;
 908
 909         sdata->vif.offload_flags = flags;
 910         ieee80211_check_fast_rx_iface(sdata);
 911         return true;
 912 }
 913
 914 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
 915 {
 916         struct ieee80211_local *local = sdata->local;
 917         struct ieee80211_sub_if_data *bss = sdata;
 918         bool enabled;
 919
 920         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 921                 if (!sdata->bss)
 922                         return;
 923
 924                 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
 925         }
 926
 927         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
 928             !ieee80211_iftype_supports_hdr_offload(bss->vif.type))
 929                 return;
 930
 931         enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
 932         if (sdata->wdev.use_4addr &&
 933             !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
 934                 enabled = false;
 935
 936         sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
 937                                            &ieee80211_dataif_ops;
 938 }
 939
 940 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
 941 {
 942         struct ieee80211_local *local = sdata->local;
 943         struct ieee80211_sub_if_data *vsdata;
 944
 945         if (ieee80211_set_sdata_offload_flags(sdata)) {
 946                 drv_update_vif_offload(local, sdata);
 947                 ieee80211_set_vif_encap_ops(sdata);
 948         }
 949
 950         list_for_each_entry(vsdata, &local->interfaces, list) {
 951                 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
 952                     vsdata->bss != &sdata->u.ap)
 953                         continue;
 954
 955                 ieee80211_set_vif_encap_ops(vsdata);
 956         }
 957 }
 958
 959 void ieee80211_recalc_offload(struct ieee80211_local *local)
 960 {
 961         struct ieee80211_sub_if_data *sdata;
 962
 963         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
 964                 return;
 965
 966         mutex_lock(&local->iflist_mtx);
 967
 968         list_for_each_entry(sdata, &local->interfaces, list) {
 969                 if (!ieee80211_sdata_running(sdata))
 970                         continue;
 971
 972                 ieee80211_recalc_sdata_offload(sdata);
 973         }
 974
 975         mutex_unlock(&local->iflist_mtx);
 976 }
 977
 978 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 979                                     const int offset)
 980 {
 981         struct ieee80211_local *local = sdata->local;
 982         u32 flags = sdata->u.mntr.flags;
 983
 984 #define ADJUST(_f, _s)  do {                                    \
 985         if (flags & MONITOR_FLAG_##_f)                          \
 986                 local->fif_##_s += offset;                      \
 987         } while (0)
 988
 989         ADJUST(FCSFAIL, fcsfail);
 990         ADJUST(PLCPFAIL, plcpfail);
 991         ADJUST(CONTROL, control);
 992         ADJUST(CONTROL, pspoll);
 993         ADJUST(OTHER_BSS, other_bss);
 994
 995 #undef ADJUST
 996 }
 997
 998 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 999 {
1000         struct ieee80211_local *local = sdata->local;
1001         int i;
1002
1003         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
1004                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1005                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
1006                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
1007                         sdata->vif.hw_queue[i] = i;
1008                 else
1009                         sdata->vif.hw_queue[i] = 0;
1010         }
1011         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
1012 }
1013
1014 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
1015 {
1016         struct ieee80211_sub_if_data *sdata;
1017         int ret;
1018
1019         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1020                 return 0;
1021
1022         ASSERT_RTNL();
1023         lockdep_assert_wiphy(local->hw.wiphy);
1024
1025         if (local->monitor_sdata)
1026                 return 0;
1027
1028         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
1029         if (!sdata)
1030                 return -ENOMEM;
1031
1032         /* set up data */
1033         sdata->local = local;
1034         sdata->vif.type = NL80211_IFTYPE_MONITOR;
1035         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
1036                  wiphy_name(local->hw.wiphy));
1037         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
1038
1039         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1040
1041         ieee80211_set_default_queues(sdata);
1042
1043         ret = drv_add_interface(local, sdata);
1044         if (WARN_ON(ret)) {
1045                 /* ok .. stupid driver, it asked for this! */
1046                 kfree(sdata);
1047                 return ret;
1048         }
1049
1050         set_bit(SDATA_STATE_RUNNING, &sdata->state);
1051
1052         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
1053         if (ret) {
1054                 kfree(sdata);
1055                 return ret;
1056         }
1057
1058         mutex_lock(&local->iflist_mtx);
1059         rcu_assign_pointer(local->monitor_sdata, sdata);
1060         mutex_unlock(&local->iflist_mtx);
1061
1062         mutex_lock(&local->mtx);
1063         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
1064                                         IEEE80211_CHANCTX_EXCLUSIVE);
1065         mutex_unlock(&local->mtx);
1066         if (ret) {
1067                 mutex_lock(&local->iflist_mtx);
1068                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
1069                 mutex_unlock(&local->iflist_mtx);
1070                 synchronize_net();
1071                 drv_remove_interface(local, sdata);
1072                 kfree(sdata);
1073                 return ret;
1074         }
1075
1076         skb_queue_head_init(&sdata->skb_queue);
1077         skb_queue_head_init(&sdata->status_queue);
1078         INIT_WORK(&sdata->work, ieee80211_iface_work);
1079
1080         return 0;
1081 }
1082
1083 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
1084 {
1085         struct ieee80211_sub_if_data *sdata;
1086
1087         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1088                 return;
1089
1090         ASSERT_RTNL();
1091         lockdep_assert_wiphy(local->hw.wiphy);
1092
1093         mutex_lock(&local->iflist_mtx);
1094
1095         sdata = rcu_dereference_protected(local->monitor_sdata,
1096                                           lockdep_is_held(&local->iflist_mtx));
1097         if (!sdata) {
1098                 mutex_unlock(&local->iflist_mtx);
1099                 return;
1100         }
1101
1102         RCU_INIT_POINTER(local->monitor_sdata, NULL);
1103         mutex_unlock(&local->iflist_mtx);
1104
1105         synchronize_net();
1106
1107         mutex_lock(&local->mtx);
1108         ieee80211_vif_release_channel(sdata);
1109         mutex_unlock(&local->mtx);
1110
1111         drv_remove_interface(local, sdata);
1112
1113         kfree(sdata);
1114 }
1115
1116 /*
1117  * NOTE: Be very careful when changing this function, it must NOT return
1118  * an error on interface type changes that have been pre-checked, so most
1119  * checks should be in ieee80211_check_concurrent_iface.
1120  */
1121 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1122 {
1123         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1124         struct net_device *dev = wdev->netdev;
1125         struct ieee80211_local *local = sdata->local;
1126         u32 changed = 0;
1127         int res;
1128         u32 hw_reconf_flags = 0;
1129
1130         switch (sdata->vif.type) {
1131         case NL80211_IFTYPE_AP_VLAN: {
1132                 struct ieee80211_sub_if_data *master;
1133
1134                 if (!sdata->bss)
1135                         return -ENOLINK;
1136
1137                 mutex_lock(&local->mtx);
1138                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1139                 mutex_unlock(&local->mtx);
1140
1141                 master = container_of(sdata->bss,
1142                                       struct ieee80211_sub_if_data, u.ap);
1143                 sdata->control_port_protocol =
1144                         master->control_port_protocol;
1145                 sdata->control_port_no_encrypt =
1146                         master->control_port_no_encrypt;
1147                 sdata->control_port_over_nl80211 =
1148                         master->control_port_over_nl80211;
1149                 sdata->control_port_no_preauth =
1150                         master->control_port_no_preauth;
1151                 sdata->vif.cab_queue = master->vif.cab_queue;
1152                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1153                        sizeof(sdata->vif.hw_queue));
1154                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1155
1156                 mutex_lock(&local->key_mtx);
1157                 sdata->crypto_tx_tailroom_needed_cnt +=
1158                         master->crypto_tx_tailroom_needed_cnt;
1159                 mutex_unlock(&local->key_mtx);
1160
1161                 break;
1162                 }
1163         case NL80211_IFTYPE_AP:
1164                 sdata->bss = &sdata->u.ap;
1165                 break;
1166         case NL80211_IFTYPE_MESH_POINT:
1167         case NL80211_IFTYPE_STATION:
1168         case NL80211_IFTYPE_MONITOR:
1169         case NL80211_IFTYPE_ADHOC:
1170         case NL80211_IFTYPE_P2P_DEVICE:
1171         case NL80211_IFTYPE_OCB:
1172         case NL80211_IFTYPE_NAN:
1173                 /* no special treatment */
1174                 break;
1175         case NL80211_IFTYPE_UNSPECIFIED:
1176         case NUM_NL80211_IFTYPES:
1177         case NL80211_IFTYPE_P2P_CLIENT:
1178         case NL80211_IFTYPE_P2P_GO:
1179         case NL80211_IFTYPE_WDS:
1180                 /* cannot happen */
1181                 WARN_ON(1);
1182                 break;
1183         }
1184
1185         if (local->open_count == 0) {
1186                 res = drv_start(local);
1187                 if (res)
1188                         goto err_del_bss;
1189                 /* we're brought up, everything changes */
1190                 hw_reconf_flags = ~0;
1191                 ieee80211_led_radio(local, true);
1192                 ieee80211_mod_tpt_led_trig(local,
1193                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1194         }
1195
1196         /*
1197          * Copy the hopefully now-present MAC address to
1198          * this interface, if it has the special null one.
1199          */
1200         if (dev && is_zero_ether_addr(dev->dev_addr)) {
1201                 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr);
1202                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1203
1204                 if (!is_valid_ether_addr(dev->dev_addr)) {
1205                         res = -EADDRNOTAVAIL;
1206                         goto err_stop;
1207                 }
1208         }
1209
1210         switch (sdata->vif.type) {
1211         case NL80211_IFTYPE_AP_VLAN:
1212                 /* no need to tell driver, but set carrier and chanctx */
1213                 if (rtnl_dereference(sdata->bss->beacon)) {
1214                         ieee80211_vif_vlan_copy_chanctx(sdata);
1215                         netif_carrier_on(dev);
1216                         ieee80211_set_vif_encap_ops(sdata);
1217                 } else {
1218                         netif_carrier_off(dev);
1219                 }
1220                 break;
1221         case NL80211_IFTYPE_MONITOR:
1222                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1223                         local->cooked_mntrs++;
1224                         break;
1225                 }
1226
1227                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1228                         res = drv_add_interface(local, sdata);
1229                         if (res)
1230                                 goto err_stop;
1231                 } else if (local->monitors == 0 && local->open_count == 0) {
1232                         res = ieee80211_add_virtual_monitor(local);
1233                         if (res)
1234                                 goto err_stop;
1235                 }
1236
1237                 /* must be before the call to ieee80211_configure_filter */
1238                 local->monitors++;
1239                 if (local->monitors == 1) {
1240                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1241                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1242                 }
1243
1244                 ieee80211_adjust_monitor_flags(sdata, 1);
1245                 ieee80211_configure_filter(local);
1246                 ieee80211_recalc_offload(local);
1247                 mutex_lock(&local->mtx);
1248                 ieee80211_recalc_idle(local);
1249                 mutex_unlock(&local->mtx);
1250
1251                 netif_carrier_on(dev);
1252                 break;
1253         default:
1254                 if (coming_up) {
1255                         ieee80211_del_virtual_monitor(local);
1256                         ieee80211_set_sdata_offload_flags(sdata);
1257
1258                         res = drv_add_interface(local, sdata);
1259                         if (res)
1260                                 goto err_stop;
1261
1262                         ieee80211_set_vif_encap_ops(sdata);
1263                         res = ieee80211_check_queues(sdata,
1264                                 ieee80211_vif_type_p2p(&sdata->vif));
1265                         if (res)
1266                                 goto err_del_interface;
1267                 }
1268
1269                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1270                         local->fif_pspoll++;
1271                         local->fif_probe_req++;
1272
1273                         ieee80211_configure_filter(local);
1274                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1275                         local->fif_probe_req++;
1276                 }
1277
1278                 if (sdata->vif.probe_req_reg)
1279                         drv_config_iface_filter(local, sdata,
1280                                                 FIF_PROBE_REQ,
1281                                                 FIF_PROBE_REQ);
1282
1283                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1284                     sdata->vif.type != NL80211_IFTYPE_NAN)
1285                         changed |= ieee80211_reset_erp_info(sdata);
1286                 ieee80211_bss_info_change_notify(sdata, changed);
1287
1288                 switch (sdata->vif.type) {
1289                 case NL80211_IFTYPE_STATION:
1290                 case NL80211_IFTYPE_ADHOC:
1291                 case NL80211_IFTYPE_AP:
1292                 case NL80211_IFTYPE_MESH_POINT:
1293                 case NL80211_IFTYPE_OCB:
1294                         netif_carrier_off(dev);
1295                         break;
1296                 case NL80211_IFTYPE_P2P_DEVICE:
1297                 case NL80211_IFTYPE_NAN:
1298                         break;
1299                 default:
1300                         /* not reached */
1301                         WARN_ON(1);
1302                 }
1303
1304                 /*
1305                  * Set default queue parameters so drivers don't
1306                  * need to initialise the hardware if the hardware
1307                  * doesn't start up with sane defaults.
1308                  * Enable QoS for anything but station interfaces.
1309                  */
1310                 ieee80211_set_wmm_default(sdata, true,
1311                         sdata->vif.type != NL80211_IFTYPE_STATION);
1312         }
1313
1314         set_bit(SDATA_STATE_RUNNING, &sdata->state);
1315
1316         switch (sdata->vif.type) {
1317         case NL80211_IFTYPE_P2P_DEVICE:
1318                 rcu_assign_pointer(local->p2p_sdata, sdata);
1319                 break;
1320         case NL80211_IFTYPE_MONITOR:
1321                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1322                         break;
1323                 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1324                 break;
1325         default:
1326                 break;
1327         }
1328
1329         /*
1330          * set_multicast_list will be invoked by the networking core
1331          * which will check whether any increments here were done in
1332          * error and sync them down to the hardware as filter flags.
1333          */
1334         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1335                 atomic_inc(&local->iff_allmultis);
1336
1337         if (coming_up)
1338                 local->open_count++;
1339
1340         if (hw_reconf_flags)
1341                 ieee80211_hw_config(local, hw_reconf_flags);
1342
1343         ieee80211_recalc_ps(local);
1344
1345         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1346             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1347             local->ops->wake_tx_queue) {
1348                 /* XXX: for AP_VLAN, actually track AP queues */
1349                 if (dev)
1350                         netif_tx_start_all_queues(dev);
1351         } else if (dev) {
1352                 unsigned long flags;
1353                 int n_acs = IEEE80211_NUM_ACS;
1354                 int ac;
1355
1356                 if (local->hw.queues < IEEE80211_NUM_ACS)
1357                         n_acs = 1;
1358
1359                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1360                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
1361                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
1362                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
1363                         for (ac = 0; ac < n_acs; ac++) {
1364                                 int ac_queue = sdata->vif.hw_queue[ac];
1365
1366                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
1367                                     skb_queue_empty(&local->pending[ac_queue]))
1368                                         netif_start_subqueue(dev, ac);
1369                         }
1370                 }
1371                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1372         }
1373
1374         return 0;
1375  err_del_interface:
1376         drv_remove_interface(local, sdata);
1377  err_stop:
1378         if (!local->open_count)
1379                 drv_stop(local);
1380  err_del_bss:
1381         sdata->bss = NULL;
1382         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1383                 mutex_lock(&local->mtx);
1384                 list_del(&sdata->u.vlan.list);
1385                 mutex_unlock(&local->mtx);
1386         }
1387         /* might already be clear but that doesn't matter */
1388         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1389         return res;
1390 }
1391
1392 static void ieee80211_if_free(struct net_device *dev)
1393 {
1394         free_percpu(dev->tstats);
1395 }
1396
1397 static void ieee80211_if_setup(struct net_device *dev)
1398 {
1399         ether_setup(dev);
1400         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1401         dev->netdev_ops = &ieee80211_dataif_ops;
1402         dev->needs_free_netdev = true;
1403         dev->priv_destructor = ieee80211_if_free;
1404 }
1405
1406 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1407 {
1408         ieee80211_if_setup(dev);
1409         dev->priv_flags |= IFF_NO_QUEUE;
1410 }
1411
1412 static void ieee80211_iface_process_skb(struct ieee80211_local *local,
1413                                         struct ieee80211_sub_if_data *sdata,
1414                                         struct sk_buff *skb)
1415 {
1416         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1417
1418         if (ieee80211_is_action(mgmt->frame_control) &&
1419             mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1420                 struct sta_info *sta;
1421                 int len = skb->len;
1422
1423                 mutex_lock(&local->sta_mtx);
1424                 sta = sta_info_get_bss(sdata, mgmt->sa);
1425                 if (sta) {
1426                         switch (mgmt->u.action.u.addba_req.action_code) {
1427                         case WLAN_ACTION_ADDBA_REQ:
1428                                 ieee80211_process_addba_request(local, sta,
1429                                                                 mgmt, len);
1430                                 break;
1431                         case WLAN_ACTION_ADDBA_RESP:
1432                                 ieee80211_process_addba_resp(local, sta,
1433                                                              mgmt, len);
1434                                 break;
1435                         case WLAN_ACTION_DELBA:
1436                                 ieee80211_process_delba(sdata, sta,
1437                                                         mgmt, len);
1438                                 break;
1439                         default:
1440                                 WARN_ON(1);
1441                                 break;
1442                         }
1443                 }
1444                 mutex_unlock(&local->sta_mtx);
1445         } else if (ieee80211_is_action(mgmt->frame_control) &&
1446                    mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1447                 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1448                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1449                         struct ieee80211_rx_status *status;
1450                         enum nl80211_band band;
1451                         struct sta_info *sta;
1452                         u8 opmode;
1453
1454                         status = IEEE80211_SKB_RXCB(skb);
1455                         band = status->band;
1456                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1457
1458                         mutex_lock(&local->sta_mtx);
1459                         sta = sta_info_get_bss(sdata, mgmt->sa);
1460
1461                         if (sta)
1462                                 ieee80211_vht_handle_opmode(sdata, sta, opmode,
1463                                                             band);
1464
1465                         mutex_unlock(&local->sta_mtx);
1466                         break;
1467                 }
1468                 case WLAN_VHT_ACTION_GROUPID_MGMT:
1469                         ieee80211_process_mu_groups(sdata, mgmt);
1470                         break;
1471                 default:
1472                         WARN_ON(1);
1473                         break;
1474                 }
1475         } else if (ieee80211_is_action(mgmt->frame_control) &&
1476                    mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1477                 switch (mgmt->u.action.u.s1g.action_code) {
1478                 case WLAN_S1G_TWT_TEARDOWN:
1479                 case WLAN_S1G_TWT_SETUP:
1480                         ieee80211_s1g_rx_twt_action(sdata, skb);
1481                         break;
1482                 default:
1483                         break;
1484                 }
1485         } else if (ieee80211_is_ext(mgmt->frame_control)) {
1486                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1487                         ieee80211_sta_rx_queued_ext(sdata, skb);
1488                 else
1489                         WARN_ON(1);
1490         } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1491                 struct ieee80211_hdr *hdr = (void *)mgmt;
1492                 struct sta_info *sta;
1493
1494                 /*
1495                  * So the frame isn't mgmt, but frame_control
1496                  * is at the right place anyway, of course, so
1497                  * the if statement is correct.
1498                  *
1499                  * Warn if we have other data frame types here,
1500                  * they must not get here.
1501                  */
1502                 WARN_ON(hdr->frame_control &
1503                                 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1504                 WARN_ON(!(hdr->seq_ctrl &
1505                                 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1506                 /*
1507                  * This was a fragment of a frame, received while
1508                  * a block-ack session was active. That cannot be
1509                  * right, so terminate the session.
1510                  */
1511                 mutex_lock(&local->sta_mtx);
1512                 sta = sta_info_get_bss(sdata, mgmt->sa);
1513                 if (sta) {
1514                         u16 tid = ieee80211_get_tid(hdr);
1515
1516                         __ieee80211_stop_rx_ba_session(
1517                                 sta, tid, WLAN_BACK_RECIPIENT,
1518                                 WLAN_REASON_QSTA_REQUIRE_SETUP,
1519                                 true);
1520                 }
1521                 mutex_unlock(&local->sta_mtx);
1522         } else switch (sdata->vif.type) {
1523         case NL80211_IFTYPE_STATION:
1524                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1525                 break;
1526         case NL80211_IFTYPE_ADHOC:
1527                 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1528                 break;
1529         case NL80211_IFTYPE_MESH_POINT:
1530                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1531                         break;
1532                 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1533                 break;
1534         default:
1535                 WARN(1, "frame for unexpected interface type");
1536                 break;
1537         }
1538 }
1539
1540 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata,
1541                                            struct sk_buff *skb)
1542 {
1543         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1544
1545         if (ieee80211_is_action(mgmt->frame_control) &&
1546             mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1547                 switch (mgmt->u.action.u.s1g.action_code) {
1548                 case WLAN_S1G_TWT_TEARDOWN:
1549                 case WLAN_S1G_TWT_SETUP:
1550                         ieee80211_s1g_status_twt_action(sdata, skb);
1551                         break;
1552                 default:
1553                         break;
1554                 }
1555         }
1556 }
1557
1558 static void ieee80211_iface_work(struct work_struct *work)
1559 {
1560         struct ieee80211_sub_if_data *sdata =
1561                 container_of(work, struct ieee80211_sub_if_data, work);
1562         struct ieee80211_local *local = sdata->local;
1563         struct sk_buff *skb;
1564
1565         if (!ieee80211_sdata_running(sdata))
1566                 return;
1567
1568         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1569                 return;
1570
1571         if (!ieee80211_can_run_worker(local))
1572                 return;
1573
1574         /* first process frames */
1575         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1576                 kcov_remote_start_common(skb_get_kcov_handle(skb));
1577
1578                 if (skb->protocol == cpu_to_be16(ETH_P_TDLS))
1579                         ieee80211_process_tdls_channel_switch(sdata, skb);
1580                 else
1581                         ieee80211_iface_process_skb(local, sdata, skb);
1582
1583                 kfree_skb(skb);
1584                 kcov_remote_stop();
1585         }
1586
1587         /* process status queue */
1588         while ((skb = skb_dequeue(&sdata->status_queue))) {
1589                 kcov_remote_start_common(skb_get_kcov_handle(skb));
1590
1591                 ieee80211_iface_process_status(sdata, skb);
1592                 kfree_skb(skb);
1593
1594                 kcov_remote_stop();
1595         }
1596
1597         /* then other type-dependent work */
1598         switch (sdata->vif.type) {
1599         case NL80211_IFTYPE_STATION:
1600                 ieee80211_sta_work(sdata);
1601                 break;
1602         case NL80211_IFTYPE_ADHOC:
1603                 ieee80211_ibss_work(sdata);
1604                 break;
1605         case NL80211_IFTYPE_MESH_POINT:
1606                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1607                         break;
1608                 ieee80211_mesh_work(sdata);
1609                 break;
1610         case NL80211_IFTYPE_OCB:
1611                 ieee80211_ocb_work(sdata);
1612                 break;
1613         default:
1614                 break;
1615         }
1616 }
1617
1618 static void ieee80211_recalc_smps_work(struct work_struct *work)
1619 {
1620         struct ieee80211_sub_if_data *sdata =
1621                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1622
1623         ieee80211_recalc_smps(sdata);
1624 }
1625
1626 /*
1627  * Helper function to initialise an interface to a specific type.
1628  */
1629 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1630                                   enum nl80211_iftype type)
1631 {
1632         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1633                                                     0xff, 0xff, 0xff};
1634
1635         /* clear type-dependent union */
1636         memset(&sdata->u, 0, sizeof(sdata->u));
1637
1638         /* and set some type-dependent values */
1639         sdata->vif.type = type;
1640         sdata->vif.p2p = false;
1641         sdata->wdev.iftype = type;
1642
1643         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1644         sdata->control_port_no_encrypt = false;
1645         sdata->control_port_over_nl80211 = false;
1646         sdata->control_port_no_preauth = false;
1647         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1648         sdata->vif.bss_conf.idle = true;
1649         sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1650
1651         sdata->noack_map = 0;
1652
1653         /* only monitor/p2p-device differ */
1654         if (sdata->dev) {
1655                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1656                 sdata->dev->type = ARPHRD_ETHER;
1657         }
1658
1659         skb_queue_head_init(&sdata->skb_queue);
1660         skb_queue_head_init(&sdata->status_queue);
1661         INIT_WORK(&sdata->work, ieee80211_iface_work);
1662         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1663         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1664         INIT_WORK(&sdata->color_change_finalize_work, ieee80211_color_change_finalize_work);
1665         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1666         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1667
1668         switch (type) {
1669         case NL80211_IFTYPE_P2P_GO:
1670                 type = NL80211_IFTYPE_AP;
1671                 sdata->vif.type = type;
1672                 sdata->vif.p2p = true;
1673                 fallthrough;
1674         case NL80211_IFTYPE_AP:
1675                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1676                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1677                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1678                 break;
1679         case NL80211_IFTYPE_P2P_CLIENT:
1680                 type = NL80211_IFTYPE_STATION;
1681                 sdata->vif.type = type;
1682                 sdata->vif.p2p = true;
1683                 fallthrough;
1684         case NL80211_IFTYPE_STATION:
1685                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1686                 ieee80211_sta_setup_sdata(sdata);
1687                 break;
1688         case NL80211_IFTYPE_OCB:
1689                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1690                 ieee80211_ocb_setup_sdata(sdata);
1691                 break;
1692         case NL80211_IFTYPE_ADHOC:
1693                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1694                 ieee80211_ibss_setup_sdata(sdata);
1695                 break;
1696         case NL80211_IFTYPE_MESH_POINT:
1697                 if (ieee80211_vif_is_mesh(&sdata->vif))
1698                         ieee80211_mesh_init_sdata(sdata);
1699                 break;
1700         case NL80211_IFTYPE_MONITOR:
1701                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1702                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1703                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1704                                       MONITOR_FLAG_OTHER_BSS;
1705                 break;
1706         case NL80211_IFTYPE_NAN:
1707                 idr_init(&sdata->u.nan.function_inst_ids);
1708                 spin_lock_init(&sdata->u.nan.func_lock);
1709                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1710                 break;
1711         case NL80211_IFTYPE_AP_VLAN:
1712         case NL80211_IFTYPE_P2P_DEVICE:
1713                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1714                 break;
1715         case NL80211_IFTYPE_UNSPECIFIED:
1716         case NL80211_IFTYPE_WDS:
1717         case NUM_NL80211_IFTYPES:
1718                 WARN_ON(1);
1719                 break;
1720         }
1721
1722         ieee80211_debugfs_add_netdev(sdata);
1723 }
1724
1725 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1726                                            enum nl80211_iftype type)
1727 {
1728         struct ieee80211_local *local = sdata->local;
1729         int ret, err;
1730         enum nl80211_iftype internal_type = type;
1731         bool p2p = false;
1732
1733         ASSERT_RTNL();
1734
1735         if (!local->ops->change_interface)
1736                 return -EBUSY;
1737
1738         switch (sdata->vif.type) {
1739         case NL80211_IFTYPE_AP:
1740                 if (!list_empty(&sdata->u.ap.vlans))
1741                         return -EBUSY;
1742                 break;
1743         case NL80211_IFTYPE_STATION:
1744         case NL80211_IFTYPE_ADHOC:
1745         case NL80211_IFTYPE_OCB:
1746                 /*
1747                  * Could maybe also all others here?
1748                  * Just not sure how that interacts
1749                  * with the RX/config path e.g. for
1750                  * mesh.
1751                  */
1752                 break;
1753         default:
1754                 return -EBUSY;
1755         }
1756
1757         switch (type) {
1758         case NL80211_IFTYPE_AP:
1759         case NL80211_IFTYPE_STATION:
1760         case NL80211_IFTYPE_ADHOC:
1761         case NL80211_IFTYPE_OCB:
1762                 /*
1763                  * Could probably support everything
1764                  * but here.
1765                  */
1766                 break;
1767         case NL80211_IFTYPE_P2P_CLIENT:
1768                 p2p = true;
1769                 internal_type = NL80211_IFTYPE_STATION;
1770                 break;
1771         case NL80211_IFTYPE_P2P_GO:
1772                 p2p = true;
1773                 internal_type = NL80211_IFTYPE_AP;
1774                 break;
1775         default:
1776                 return -EBUSY;
1777         }
1778
1779         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1780         if (ret)
1781                 return ret;
1782
1783         ieee80211_stop_vif_queues(local, sdata,
1784                                   IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1785         synchronize_net();
1786
1787         ieee80211_do_stop(sdata, false);
1788
1789         ieee80211_teardown_sdata(sdata);
1790
1791         ieee80211_set_sdata_offload_flags(sdata);
1792         ret = drv_change_interface(local, sdata, internal_type, p2p);
1793         if (ret)
1794                 type = ieee80211_vif_type_p2p(&sdata->vif);
1795
1796         /*
1797          * Ignore return value here, there's not much we can do since
1798          * the driver changed the interface type internally already.
1799          * The warnings will hopefully make driver authors fix it :-)
1800          */
1801         ieee80211_check_queues(sdata, type);
1802
1803         ieee80211_setup_sdata(sdata, type);
1804         ieee80211_set_vif_encap_ops(sdata);
1805
1806         err = ieee80211_do_open(&sdata->wdev, false);
1807         WARN(err, "type change: do_open returned %d", err);
1808
1809         ieee80211_wake_vif_queues(local, sdata,
1810                                   IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1811         return ret;
1812 }
1813
1814 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1815                              enum nl80211_iftype type)
1816 {
1817         int ret;
1818
1819         ASSERT_RTNL();
1820
1821         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1822                 return 0;
1823
1824         if (ieee80211_sdata_running(sdata)) {
1825                 ret = ieee80211_runtime_change_iftype(sdata, type);
1826                 if (ret)
1827                         return ret;
1828         } else {
1829                 /* Purge and reset type-dependent state. */
1830                 ieee80211_teardown_sdata(sdata);
1831                 ieee80211_setup_sdata(sdata, type);
1832         }
1833
1834         /* reset some values that shouldn't be kept across type changes */
1835         if (type == NL80211_IFTYPE_STATION)
1836                 sdata->u.mgd.use_4addr = false;
1837
1838         return 0;
1839 }
1840
1841 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1842                                        u8 *perm_addr, enum nl80211_iftype type)
1843 {
1844         struct ieee80211_sub_if_data *sdata;
1845         u64 mask, start, addr, val, inc;
1846         u8 *m;
1847         u8 tmp_addr[ETH_ALEN];
1848         int i;
1849
1850         /* default ... something at least */
1851         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1852
1853         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1854             local->hw.wiphy->n_addresses <= 1)
1855                 return;
1856
1857         mutex_lock(&local->iflist_mtx);
1858
1859         switch (type) {
1860         case NL80211_IFTYPE_MONITOR:
1861                 /* doesn't matter */
1862                 break;
1863         case NL80211_IFTYPE_AP_VLAN:
1864                 /* match up with an AP interface */
1865                 list_for_each_entry(sdata, &local->interfaces, list) {
1866                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1867                                 continue;
1868                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1869                         break;
1870                 }
1871                 /* keep default if no AP interface present */
1872                 break;
1873         case NL80211_IFTYPE_P2P_CLIENT:
1874         case NL80211_IFTYPE_P2P_GO:
1875                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1876                         list_for_each_entry(sdata, &local->interfaces, list) {
1877                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1878                                         continue;
1879                                 if (!ieee80211_sdata_running(sdata))
1880                                         continue;
1881                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1882                                 goto out_unlock;
1883                         }
1884                 }
1885                 fallthrough;
1886         default:
1887                 /* assign a new address if possible -- try n_addresses first */
1888                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1889                         bool used = false;
1890
1891                         list_for_each_entry(sdata, &local->interfaces, list) {
1892                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1893                                                      sdata->vif.addr)) {
1894                                         used = true;
1895                                         break;
1896                                 }
1897                         }
1898
1899                         if (!used) {
1900                                 memcpy(perm_addr,
1901                                        local->hw.wiphy->addresses[i].addr,
1902                                        ETH_ALEN);
1903                                 break;
1904                         }
1905                 }
1906
1907                 /* try mask if available */
1908                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1909                         break;
1910
1911                 m = local->hw.wiphy->addr_mask;
1912                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1913                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1914                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1915
1916                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1917                         /* not a contiguous mask ... not handled now! */
1918                         pr_info("not contiguous\n");
1919                         break;
1920                 }
1921
1922                 /*
1923                  * Pick address of existing interface in case user changed
1924                  * MAC address manually, default to perm_addr.
1925                  */
1926                 m = local->hw.wiphy->perm_addr;
1927                 list_for_each_entry(sdata, &local->interfaces, list) {
1928                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1929                                 continue;
1930                         m = sdata->vif.addr;
1931                         break;
1932                 }
1933                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1934                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1935                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1936
1937                 inc = 1ULL<<__ffs64(mask);
1938                 val = (start & mask);
1939                 addr = (start & ~mask) | (val & mask);
1940                 do {
1941                         bool used = false;
1942
1943                         tmp_addr[5] = addr >> 0*8;
1944                         tmp_addr[4] = addr >> 1*8;
1945                         tmp_addr[3] = addr >> 2*8;
1946                         tmp_addr[2] = addr >> 3*8;
1947                         tmp_addr[1] = addr >> 4*8;
1948                         tmp_addr[0] = addr >> 5*8;
1949
1950                         val += inc;
1951
1952                         list_for_each_entry(sdata, &local->interfaces, list) {
1953                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1954                                         used = true;
1955                                         break;
1956                                 }
1957                         }
1958
1959                         if (!used) {
1960                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1961                                 break;
1962                         }
1963                         addr = (start & ~mask) | (val & mask);
1964                 } while (addr != start);
1965
1966                 break;
1967         }
1968
1969  out_unlock:
1970         mutex_unlock(&local->iflist_mtx);
1971 }
1972
1973 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1974                      unsigned char name_assign_type,
1975                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1976                      struct vif_params *params)
1977 {
1978         struct net_device *ndev = NULL;
1979         struct ieee80211_sub_if_data *sdata = NULL;
1980         struct txq_info *txqi;
1981         void (*if_setup)(struct net_device *dev);
1982         int ret, i;
1983         int txqs = 1;
1984
1985         ASSERT_RTNL();
1986
1987         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1988                 struct wireless_dev *wdev;
1989
1990                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1991                                 GFP_KERNEL);
1992                 if (!sdata)
1993                         return -ENOMEM;
1994                 wdev = &sdata->wdev;
1995
1996                 sdata->dev = NULL;
1997                 strlcpy(sdata->name, name, IFNAMSIZ);
1998                 ieee80211_assign_perm_addr(local, wdev->address, type);
1999                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
2000         } else {
2001                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
2002                                  sizeof(void *));
2003                 int txq_size = 0;
2004
2005                 if (local->ops->wake_tx_queue &&
2006                     type != NL80211_IFTYPE_AP_VLAN &&
2007                     (type != NL80211_IFTYPE_MONITOR ||
2008                      (params->flags & MONITOR_FLAG_ACTIVE)))
2009                         txq_size += sizeof(struct txq_info) +
2010                                     local->hw.txq_data_size;
2011
2012                 if (local->ops->wake_tx_queue) {
2013                         if_setup = ieee80211_if_setup_no_queue;
2014                 } else {
2015                         if_setup = ieee80211_if_setup;
2016                         if (local->hw.queues >= IEEE80211_NUM_ACS)
2017                                 txqs = IEEE80211_NUM_ACS;
2018                 }
2019
2020                 ndev = alloc_netdev_mqs(size + txq_size,
2021                                         name, name_assign_type,
2022                                         if_setup, txqs, 1);
2023                 if (!ndev)
2024                         return -ENOMEM;
2025
2026                 if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len)
2027                         ndev->tx_queue_len = local->hw.wiphy->tx_queue_len;
2028
2029                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
2030
2031                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2032                 if (!ndev->tstats) {
2033                         free_netdev(ndev);
2034                         return -ENOMEM;
2035                 }
2036
2037                 ndev->needed_headroom = local->tx_headroom +
2038                                         4*6 /* four MAC addresses */
2039                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
2040                                         + 6 /* mesh */
2041                                         + 8 /* rfc1042/bridge tunnel */
2042                                         - ETH_HLEN /* ethernet hard_header_len */
2043                                         + IEEE80211_ENCRYPT_HEADROOM;
2044                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
2045
2046                 ret = dev_alloc_name(ndev, ndev->name);
2047                 if (ret < 0) {
2048                         ieee80211_if_free(ndev);
2049                         free_netdev(ndev);
2050                         return ret;
2051                 }
2052
2053                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
2054                 if (is_valid_ether_addr(params->macaddr))
2055                         eth_hw_addr_set(ndev, params->macaddr);
2056                 else
2057                         eth_hw_addr_set(ndev, ndev->perm_addr);
2058                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
2059
2060                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
2061                 sdata = netdev_priv(ndev);
2062                 ndev->ieee80211_ptr = &sdata->wdev;
2063                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
2064                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
2065
2066                 if (txq_size) {
2067                         txqi = netdev_priv(ndev) + size;
2068                         ieee80211_txq_init(sdata, NULL, txqi, 0);
2069                 }
2070
2071                 sdata->dev = ndev;
2072         }
2073
2074         /* initialise type-independent data */
2075         sdata->wdev.wiphy = local->hw.wiphy;
2076         sdata->local = local;
2077
2078         ieee80211_init_frag_cache(&sdata->frags);
2079
2080         INIT_LIST_HEAD(&sdata->key_list);
2081
2082         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
2083                           ieee80211_dfs_cac_timer_work);
2084         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
2085                           ieee80211_delayed_tailroom_dec);
2086
2087         for (i = 0; i < NUM_NL80211_BANDS; i++) {
2088                 struct ieee80211_supported_band *sband;
2089                 sband = local->hw.wiphy->bands[i];
2090                 sdata->rc_rateidx_mask[i] =
2091                         sband ? (1 << sband->n_bitrates) - 1 : 0;
2092                 if (sband) {
2093                         __le16 cap;
2094                         u16 *vht_rate_mask;
2095
2096                         memcpy(sdata->rc_rateidx_mcs_mask[i],
2097                                sband->ht_cap.mcs.rx_mask,
2098                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
2099
2100                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
2101                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
2102                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
2103                 } else {
2104                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
2105                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
2106                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
2107                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
2108                 }
2109         }
2110
2111         for (i = 0; i < IEEE80211_NUM_ACS; i++)
2112                 init_airtime_info(&sdata->airtime[i], &local->airtime[i]);
2113
2114         ieee80211_set_default_queues(sdata);
2115
2116         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2117         sdata->user_power_level = local->user_power_level;
2118
2119         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2120
2121         /* setup type-dependent data */
2122         ieee80211_setup_sdata(sdata, type);
2123
2124         if (ndev) {
2125                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
2126                 if (type == NL80211_IFTYPE_STATION)
2127                         sdata->u.mgd.use_4addr = params->use_4addr;
2128
2129                 ndev->features |= local->hw.netdev_features;
2130                 ndev->hw_features |= ndev->features &
2131                                         MAC80211_SUPPORTED_FEATURES_TX;
2132
2133                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
2134
2135                 /* MTU range is normally 256 - 2304, where the upper limit is
2136                  * the maximum MSDU size. Monitor interfaces send and receive
2137                  * MPDU and A-MSDU frames which may be much larger so we do
2138                  * not impose an upper limit in that case.
2139                  */
2140                 ndev->min_mtu = 256;
2141                 if (type == NL80211_IFTYPE_MONITOR)
2142                         ndev->max_mtu = 0;
2143                 else
2144                         ndev->max_mtu = local->hw.max_mtu;
2145
2146                 ret = cfg80211_register_netdevice(ndev);
2147                 if (ret) {
2148                         free_netdev(ndev);
2149                         return ret;
2150                 }
2151         }
2152
2153         mutex_lock(&local->iflist_mtx);
2154         list_add_tail_rcu(&sdata->list, &local->interfaces);
2155         mutex_unlock(&local->iflist_mtx);
2156
2157         if (new_wdev)
2158                 *new_wdev = &sdata->wdev;
2159
2160         return 0;
2161 }
2162
2163 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2164 {
2165         ASSERT_RTNL();
2166
2167         mutex_lock(&sdata->local->iflist_mtx);
2168         list_del_rcu(&sdata->list);
2169         mutex_unlock(&sdata->local->iflist_mtx);
2170
2171         if (sdata->vif.txq)
2172                 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2173
2174         synchronize_rcu();
2175
2176         cfg80211_unregister_wdev(&sdata->wdev);
2177
2178         if (!sdata->dev) {
2179                 ieee80211_teardown_sdata(sdata);
2180                 kfree(sdata);
2181         }
2182 }
2183
2184 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2185 {
2186         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2187                 return;
2188         ieee80211_do_stop(sdata, true);
2189 }
2190
2191 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2192 {
2193         struct ieee80211_sub_if_data *sdata, *tmp;
2194         LIST_HEAD(unreg_list);
2195         LIST_HEAD(wdev_list);
2196
2197         ASSERT_RTNL();
2198
2199         /* Before destroying the interfaces, make sure they're all stopped so
2200          * that the hardware is stopped. Otherwise, the driver might still be
2201          * iterating the interfaces during the shutdown, e.g. from a worker
2202          * or from RX processing or similar, and if it does so (using atomic
2203          * iteration) while we're manipulating the list, the iteration will
2204          * crash.
2205          *
2206          * After this, the hardware should be stopped and the driver should
2207          * have stopped all of its activities, so that we can do RCU-unaware
2208          * manipulations of the interface list below.
2209          */
2210         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2211
2212         WARN(local->open_count, "%s: open count remains %d\n",
2213              wiphy_name(local->hw.wiphy), local->open_count);
2214
2215         ieee80211_txq_teardown_flows(local);
2216
2217         mutex_lock(&local->iflist_mtx);
2218         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
2219                 list_del(&sdata->list);
2220
2221                 if (sdata->dev)
2222                         unregister_netdevice_queue(sdata->dev, &unreg_list);
2223                 else
2224                         list_add(&sdata->list, &wdev_list);
2225         }
2226         mutex_unlock(&local->iflist_mtx);
2227
2228         unregister_netdevice_many(&unreg_list);
2229
2230         wiphy_lock(local->hw.wiphy);
2231         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2232                 list_del(&sdata->list);
2233                 cfg80211_unregister_wdev(&sdata->wdev);
2234                 kfree(sdata);
2235         }
2236         wiphy_unlock(local->hw.wiphy);
2237 }
2238
2239 static int netdev_notify(struct notifier_block *nb,
2240                          unsigned long state, void *ptr)
2241 {
2242         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2243         struct ieee80211_sub_if_data *sdata;
2244
2245         if (state != NETDEV_CHANGENAME)
2246                 return NOTIFY_DONE;
2247
2248         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2249                 return NOTIFY_DONE;
2250
2251         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2252                 return NOTIFY_DONE;
2253
2254         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2255         memcpy(sdata->name, dev->name, IFNAMSIZ);
2256         ieee80211_debugfs_rename_netdev(sdata);
2257
2258         return NOTIFY_OK;
2259 }
2260
2261 static struct notifier_block mac80211_netdev_notifier = {
2262         .notifier_call = netdev_notify,
2263 };
2264
2265 int ieee80211_iface_init(void)
2266 {
2267         return register_netdevice_notifier(&mac80211_netdev_notifier);
2268 }
2269
2270 void ieee80211_iface_exit(void)
2271 {
2272         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2273 }
2274
2275 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2276 {
2277         if (sdata->vif.type == NL80211_IFTYPE_AP)
2278                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2279         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2280                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2281 }
2282
2283 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2284 {
2285         if (sdata->vif.type == NL80211_IFTYPE_AP)
2286                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2287         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2288                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2289 }