net/mac80211/iface.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Interface handling
   4  *
   5  * Copyright 2002-2005, Instant802 Networks, Inc.
   6  * Copyright 2005-2006, Devicescape Software, Inc.
   7  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   8  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   9  * Copyright 2013-2014  Intel Mobile Communications GmbH
  10  * Copyright (c) 2016        Intel Deutschland GmbH
  11  * Copyright (C) 2018-2020 Intel Corporation
  12  */
  13 #include <linux/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/if_arp.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/rtnetlink.h>
  18 #include <net/mac80211.h>
  19 #include <net/ieee80211_radiotap.h>
  20 #include "ieee80211_i.h"
  21 #include "sta_info.h"
  22 #include "debugfs_netdev.h"
  23 #include "mesh.h"
  24 #include "led.h"
  25 #include "driver-ops.h"
  26 #include "wme.h"
  27 #include "rate.h"
  28
  29 /**
  30  * DOC: Interface list locking
  31  *
  32  * The interface list in each struct ieee80211_local is protected
  33  * three-fold:
  34  *
  35  * (1) modifications may only be done under the RTNL
  36  * (2) modifications and readers are protected against each other by
  37  *     the iflist_mtx.
  38  * (3) modifications are done in an RCU manner so atomic readers
  39  *     can traverse the list in RCU-safe blocks.
  40  *
  41  * As a consequence, reads (traversals) of the list can be protected
  42  * by either the RTNL, the iflist_mtx or RCU.
  43  */
  44
  45 static void ieee80211_iface_work(struct work_struct *work);
  46
  47 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  48 {
  49         struct ieee80211_chanctx_conf *chanctx_conf;
  50         int power;
  51
  52         rcu_read_lock();
  53         chanctx_conf = rcu_dereference(sdata->vif.chanctx_conf);
  54         if (!chanctx_conf) {
  55                 rcu_read_unlock();
  56                 return false;
  57         }
  58
  59         power = ieee80211_chandef_max_power(&chanctx_conf->def);
  60         rcu_read_unlock();
  61
  62         if (sdata->user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  63                 power = min(power, sdata->user_power_level);
  64
  65         if (sdata->ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  66                 power = min(power, sdata->ap_power_level);
  67
  68         if (power != sdata->vif.bss_conf.txpower) {
  69                 sdata->vif.bss_conf.txpower = power;
  70                 ieee80211_hw_config(sdata->local, 0);
  71                 return true;
  72         }
  73
  74         return false;
  75 }
  76
  77 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
  78                               bool update_bss)
  79 {
  80         if (__ieee80211_recalc_txpower(sdata) ||
  81             (update_bss && ieee80211_sdata_running(sdata)))
  82                 ieee80211_bss_info_change_notify(sdata, BSS_CHANGED_TXPOWER);
  83 }
  84
  85 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
  86 {
  87         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  88                 return 0;
  89
  90         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  91         return IEEE80211_CONF_CHANGE_IDLE;
  92 }
  93
  94 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  95 {
  96         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  97                 return 0;
  98
  99         ieee80211_flush_queues(local, NULL, false);
 100
 101         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 102         return IEEE80211_CONF_CHANGE_IDLE;
 103 }
 104
 105 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
 106                                    bool force_active)
 107 {
 108         bool working, scanning, active;
 109         unsigned int led_trig_start = 0, led_trig_stop = 0;
 110
 111         lockdep_assert_held(&local->mtx);
 112
 113         active = force_active ||
 114                  !list_empty(&local->chanctx_list) ||
 115                  local->monitors;
 116
 117         working = !local->ops->remain_on_channel &&
 118                   !list_empty(&local->roc_list);
 119
 120         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 121                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 122
 123         if (working || scanning)
 124                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 125         else
 126                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 127
 128         if (active)
 129                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 130         else
 131                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 132
 133         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 134
 135         if (working || scanning || active)
 136                 return __ieee80211_idle_off(local);
 137         return __ieee80211_idle_on(local);
 138 }
 139
 140 u32 ieee80211_idle_off(struct ieee80211_local *local)
 141 {
 142         return __ieee80211_recalc_idle(local, true);
 143 }
 144
 145 void ieee80211_recalc_idle(struct ieee80211_local *local)
 146 {
 147         u32 change = __ieee80211_recalc_idle(local, false);
 148         if (change)
 149                 ieee80211_hw_config(local, change);
 150 }
 151
 152 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 153                                 bool check_dup)
 154 {
 155         struct ieee80211_local *local = sdata->local;
 156         struct ieee80211_sub_if_data *iter;
 157         u64 new, mask, tmp;
 158         u8 *m;
 159         int ret = 0;
 160
 161         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 162                 return 0;
 163
 164         m = addr;
 165         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 166                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 167                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 168
 169         m = local->hw.wiphy->addr_mask;
 170         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 171                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 172                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 173
 174         if (!check_dup)
 175                 return ret;
 176
 177         mutex_lock(&local->iflist_mtx);
 178         list_for_each_entry(iter, &local->interfaces, list) {
 179                 if (iter == sdata)
 180                         continue;
 181
 182                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 183                     !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 184                         continue;
 185
 186                 m = iter->vif.addr;
 187                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 188                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 189                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 190
 191                 if ((new & ~mask) != (tmp & ~mask)) {
 192                         ret = -EINVAL;
 193                         break;
 194                 }
 195         }
 196         mutex_unlock(&local->iflist_mtx);
 197
 198         return ret;
 199 }
 200
 201 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 202 {
 203         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 204         struct sockaddr *sa = addr;
 205         bool check_dup = true;
 206         int ret;
 207
 208         if (ieee80211_sdata_running(sdata))
 209                 return -EBUSY;
 210
 211         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 212             !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 213                 check_dup = false;
 214
 215         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 216         if (ret)
 217                 return ret;
 218
 219         ret = eth_mac_addr(dev, sa);
 220
 221         if (ret == 0)
 222                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 223
 224         return ret;
 225 }
 226
 227 static inline int identical_mac_addr_allowed(int type1, int type2)
 228 {
 229         return type1 == NL80211_IFTYPE_MONITOR ||
 230                 type2 == NL80211_IFTYPE_MONITOR ||
 231                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 232                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 233                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 234                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 235                         (type2 == NL80211_IFTYPE_AP ||
 236                          type2 == NL80211_IFTYPE_AP_VLAN));
 237 }
 238
 239 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 240                                             enum nl80211_iftype iftype)
 241 {
 242         struct ieee80211_local *local = sdata->local;
 243         struct ieee80211_sub_if_data *nsdata;
 244         int ret;
 245
 246         ASSERT_RTNL();
 247
 248         /* we hold the RTNL here so can safely walk the list */
 249         list_for_each_entry(nsdata, &local->interfaces, list) {
 250                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 251                         /*
 252                          * Only OCB and monitor mode may coexist
 253                          */
 254                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
 255                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
 256                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 257                              nsdata->vif.type == NL80211_IFTYPE_OCB))
 258                                 return -EBUSY;
 259
 260                         /*
 261                          * Allow only a single IBSS interface to be up at any
 262                          * time. This is restricted because beacon distribution
 263                          * cannot work properly if both are in the same IBSS.
 264                          *
 265                          * To remove this restriction we'd have to disallow them
 266                          * from setting the same SSID on different IBSS interfaces
 267                          * belonging to the same hardware. Then, however, we're
 268                          * faced with having to adopt two different TSF timers...
 269                          */
 270                         if (iftype == NL80211_IFTYPE_ADHOC &&
 271                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 272                                 return -EBUSY;
 273                         /*
 274                          * will not add another interface while any channel
 275                          * switch is active.
 276                          */
 277                         if (nsdata->vif.csa_active)
 278                                 return -EBUSY;
 279
 280                         /*
 281                          * The remaining checks are only performed for interfaces
 282                          * with the same MAC address.
 283                          */
 284                         if (!ether_addr_equal(sdata->vif.addr,
 285                                               nsdata->vif.addr))
 286                                 continue;
 287
 288                         /*
 289                          * check whether it may have the same address
 290                          */
 291                         if (!identical_mac_addr_allowed(iftype,
 292                                                         nsdata->vif.type))
 293                                 return -ENOTUNIQ;
 294
 295                         /*
 296                          * can only add VLANs to enabled APs
 297                          */
 298                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 299                             nsdata->vif.type == NL80211_IFTYPE_AP)
 300                                 sdata->bss = &nsdata->u.ap;
 301                 }
 302         }
 303
 304         mutex_lock(&local->chanctx_mtx);
 305         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
 306         mutex_unlock(&local->chanctx_mtx);
 307         return ret;
 308 }
 309
 310 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 311                                   enum nl80211_iftype iftype)
 312 {
 313         int n_queues = sdata->local->hw.queues;
 314         int i;
 315
 316         if (iftype == NL80211_IFTYPE_NAN)
 317                 return 0;
 318
 319         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 320                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 321                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 322                                          IEEE80211_INVAL_HW_QUEUE))
 323                                 return -EINVAL;
 324                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 325                                          n_queues))
 326                                 return -EINVAL;
 327                 }
 328         }
 329
 330         if ((iftype != NL80211_IFTYPE_AP &&
 331              iftype != NL80211_IFTYPE_P2P_GO &&
 332              iftype != NL80211_IFTYPE_MESH_POINT) ||
 333             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
 334                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 335                 return 0;
 336         }
 337
 338         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 339                 return -EINVAL;
 340
 341         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 342                 return -EINVAL;
 343
 344         return 0;
 345 }
 346
 347 static int ieee80211_open(struct net_device *dev)
 348 {
 349         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 350         int err;
 351
 352         /* fail early if user set an invalid address */
 353         if (!is_valid_ether_addr(dev->dev_addr))
 354                 return -EADDRNOTAVAIL;
 355
 356         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 357         if (err)
 358                 return err;
 359
 360         return ieee80211_do_open(&sdata->wdev, true);
 361 }
 362
 363 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 364                               bool going_down)
 365 {
 366         struct ieee80211_local *local = sdata->local;
 367         unsigned long flags;
 368         struct sk_buff *skb, *tmp;
 369         u32 hw_reconf_flags = 0;
 370         int i, flushed;
 371         struct ps_data *ps;
 372         struct cfg80211_chan_def chandef;
 373         bool cancel_scan;
 374         struct cfg80211_nan_func *func;
 375
 376         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 377
 378         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 379         if (cancel_scan)
 380                 ieee80211_scan_cancel(local);
 381
 382         /*
 383          * Stop TX on this interface first.
 384          */
 385         if (sdata->dev)
 386                 netif_tx_stop_all_queues(sdata->dev);
 387
 388         ieee80211_roc_purge(local, sdata);
 389
 390         switch (sdata->vif.type) {
 391         case NL80211_IFTYPE_STATION:
 392                 ieee80211_mgd_stop(sdata);
 393                 break;
 394         case NL80211_IFTYPE_ADHOC:
 395                 ieee80211_ibss_stop(sdata);
 396                 break;
 397         case NL80211_IFTYPE_MONITOR:
 398                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
 399                         break;
 400                 list_del_rcu(&sdata->u.mntr.list);
 401                 break;
 402         default:
 403                 break;
 404         }
 405
 406         /*
 407          * Remove all stations associated with this interface.
 408          *
 409          * This must be done before calling ops->remove_interface()
 410          * because otherwise we can later invoke ops->sta_notify()
 411          * whenever the STAs are removed, and that invalidates driver
 412          * assumptions about always getting a vif pointer that is valid
 413          * (because if we remove a STA after ops->remove_interface()
 414          * the driver will have removed the vif info already!)
 415          *
 416          * For AP_VLANs stations may exist since there's nothing else that
 417          * would have removed them, but in other modes there shouldn't
 418          * be any stations.
 419          */
 420         flushed = sta_info_flush(sdata);
 421         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0);
 422
 423         /* don't count this interface for allmulti while it is down */
 424         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 425                 atomic_dec(&local->iff_allmultis);
 426
 427         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 428                 local->fif_pspoll--;
 429                 local->fif_probe_req--;
 430         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 431                 local->fif_probe_req--;
 432         }
 433
 434         if (sdata->dev) {
 435                 netif_addr_lock_bh(sdata->dev);
 436                 spin_lock_bh(&local->filter_lock);
 437                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 438                                  sdata->dev->addr_len);
 439                 spin_unlock_bh(&local->filter_lock);
 440                 netif_addr_unlock_bh(sdata->dev);
 441         }
 442
 443         del_timer_sync(&local->dynamic_ps_timer);
 444         cancel_work_sync(&local->dynamic_ps_enable_work);
 445
 446         cancel_work_sync(&sdata->recalc_smps);
 447         sdata_lock(sdata);
 448         mutex_lock(&local->mtx);
 449         sdata->vif.csa_active = false;
 450         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 451                 sdata->u.mgd.csa_waiting_bcn = false;
 452         if (sdata->csa_block_tx) {
 453                 ieee80211_wake_vif_queues(local, sdata,
 454                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 455                 sdata->csa_block_tx = false;
 456         }
 457         mutex_unlock(&local->mtx);
 458         sdata_unlock(sdata);
 459
 460         cancel_work_sync(&sdata->csa_finalize_work);
 461
 462         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 463
 464         if (sdata->wdev.cac_started) {
 465                 chandef = sdata->vif.bss_conf.chandef;
 466                 WARN_ON(local->suspended);
 467                 mutex_lock(&local->mtx);
 468                 ieee80211_vif_release_channel(sdata);
 469                 mutex_unlock(&local->mtx);
 470                 cfg80211_cac_event(sdata->dev, &chandef,
 471                                    NL80211_RADAR_CAC_ABORTED,
 472                                    GFP_KERNEL);
 473         }
 474
 475         /* APs need special treatment */
 476         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 477                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 478
 479                 /* down all dependent devices, that is VLANs */
 480                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 481                                          u.vlan.list)
 482                         dev_close(vlan->dev);
 483                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 484         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 485                 /* remove all packets in parent bc_buf pointing to this dev */
 486                 ps = &sdata->bss->ps;
 487
 488                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 489                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 490                         if (skb->dev == sdata->dev) {
 491                                 __skb_unlink(skb, &ps->bc_buf);
 492                                 local->total_ps_buffered--;
 493                                 ieee80211_free_txskb(&local->hw, skb);
 494                         }
 495                 }
 496                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 497         }
 498
 499         if (going_down)
 500                 local->open_count--;
 501
 502         switch (sdata->vif.type) {
 503         case NL80211_IFTYPE_AP_VLAN:
 504                 mutex_lock(&local->mtx);
 505                 list_del(&sdata->u.vlan.list);
 506                 mutex_unlock(&local->mtx);
 507                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 508                 /* see comment in the default case below */
 509                 ieee80211_free_keys(sdata, true);
 510                 /* no need to tell driver */
 511                 break;
 512         case NL80211_IFTYPE_MONITOR:
 513                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 514                         local->cooked_mntrs--;
 515                         break;
 516                 }
 517
 518                 local->monitors--;
 519                 if (local->monitors == 0) {
 520                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 521                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 522                 }
 523
 524                 ieee80211_adjust_monitor_flags(sdata, -1);
 525                 break;
 526         case NL80211_IFTYPE_NAN:
 527                 /* clean all the functions */
 528                 spin_lock_bh(&sdata->u.nan.func_lock);
 529
 530                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
 531                         idr_remove(&sdata->u.nan.function_inst_ids, i);
 532                         cfg80211_free_nan_func(func);
 533                 }
 534                 idr_destroy(&sdata->u.nan.function_inst_ids);
 535
 536                 spin_unlock_bh(&sdata->u.nan.func_lock);
 537                 break;
 538         case NL80211_IFTYPE_P2P_DEVICE:
 539                 /* relies on synchronize_rcu() below */
 540                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 541                 fallthrough;
 542         default:
 543                 cancel_work_sync(&sdata->work);
 544                 /*
 545                  * When we get here, the interface is marked down.
 546                  * Free the remaining keys, if there are any
 547                  * (which can happen in AP mode if userspace sets
 548                  * keys before the interface is operating)
 549                  *
 550                  * Force the key freeing to always synchronize_net()
 551                  * to wait for the RX path in case it is using this
 552                  * interface enqueuing frames at this very time on
 553                  * another CPU.
 554                  */
 555                 ieee80211_free_keys(sdata, true);
 556                 skb_queue_purge(&sdata->skb_queue);
 557         }
 558
 559         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 560         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 561                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 562                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 563                         if (info->control.vif == &sdata->vif) {
 564                                 __skb_unlink(skb, &local->pending[i]);
 565                                 ieee80211_free_txskb(&local->hw, skb);
 566                         }
 567                 }
 568         }
 569         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 570
 571         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 572                 ieee80211_txq_remove_vlan(local, sdata);
 573
 574         sdata->bss = NULL;
 575
 576         if (local->open_count == 0)
 577                 ieee80211_clear_tx_pending(local);
 578
 579         sdata->vif.bss_conf.beacon_int = 0;
 580
 581         /*
 582          * If the interface goes down while suspended, presumably because
 583          * the device was unplugged and that happens before our resume,
 584          * then the driver is already unconfigured and the remainder of
 585          * this function isn't needed.
 586          * XXX: what about WoWLAN? If the device has software state, e.g.
 587          *      memory allocated, it might expect teardown commands from
 588          *      mac80211 here?
 589          */
 590         if (local->suspended) {
 591                 WARN_ON(local->wowlan);
 592                 WARN_ON(rtnl_dereference(local->monitor_sdata));
 593                 return;
 594         }
 595
 596         switch (sdata->vif.type) {
 597         case NL80211_IFTYPE_AP_VLAN:
 598                 break;
 599         case NL80211_IFTYPE_MONITOR:
 600                 if (local->monitors == 0)
 601                         ieee80211_del_virtual_monitor(local);
 602
 603                 mutex_lock(&local->mtx);
 604                 ieee80211_recalc_idle(local);
 605                 mutex_unlock(&local->mtx);
 606
 607                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 608                         break;
 609
 610                 fallthrough;
 611         default:
 612                 if (going_down)
 613                         drv_remove_interface(local, sdata);
 614         }
 615
 616         ieee80211_recalc_ps(local);
 617
 618         if (cancel_scan)
 619                 flush_delayed_work(&local->scan_work);
 620
 621         if (local->open_count == 0) {
 622                 ieee80211_stop_device(local);
 623
 624                 /* no reconfiguring after stop! */
 625                 return;
 626         }
 627
 628         /* do after stop to avoid reconfiguring when we stop anyway */
 629         ieee80211_configure_filter(local);
 630         ieee80211_hw_config(local, hw_reconf_flags);
 631
 632         if (local->monitors == local->open_count)
 633                 ieee80211_add_virtual_monitor(local);
 634 }
 635
 636 static int ieee80211_stop(struct net_device *dev)
 637 {
 638         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 639
 640         ieee80211_do_stop(sdata, true);
 641
 642         return 0;
 643 }
 644
 645 static void ieee80211_set_multicast_list(struct net_device *dev)
 646 {
 647         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 648         struct ieee80211_local *local = sdata->local;
 649         int allmulti, sdata_allmulti;
 650
 651         allmulti = !!(dev->flags & IFF_ALLMULTI);
 652         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 653
 654         if (allmulti != sdata_allmulti) {
 655                 if (dev->flags & IFF_ALLMULTI)
 656                         atomic_inc(&local->iff_allmultis);
 657                 else
 658                         atomic_dec(&local->iff_allmultis);
 659                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 660         }
 661
 662         spin_lock_bh(&local->filter_lock);
 663         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 664         spin_unlock_bh(&local->filter_lock);
 665         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 666 }
 667
 668 /*
 669  * Called when the netdev is removed or, by the code below, before
 670  * the interface type changes.
 671  */
 672 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 673 {
 674         int i;
 675
 676         /* free extra data */
 677         ieee80211_free_keys(sdata, false);
 678
 679         ieee80211_debugfs_remove_netdev(sdata);
 680
 681         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 682                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 683         sdata->fragment_next = 0;
 684
 685         if (ieee80211_vif_is_mesh(&sdata->vif))
 686                 ieee80211_mesh_teardown_sdata(sdata);
 687 }
 688
 689 static void ieee80211_uninit(struct net_device *dev)
 690 {
 691         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
 692 }
 693
 694 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 695                                          struct sk_buff *skb,
 696                                          struct net_device *sb_dev)
 697 {
 698         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 699 }
 700
 701 static void
 702 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 703 {
 704         dev_fetch_sw_netstats(stats, dev->tstats);
 705 }
 706
 707 static const struct net_device_ops ieee80211_dataif_ops = {
 708         .ndo_open               = ieee80211_open,
 709         .ndo_stop               = ieee80211_stop,
 710         .ndo_uninit             = ieee80211_uninit,
 711         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 712         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 713         .ndo_set_mac_address    = ieee80211_change_mac,
 714         .ndo_select_queue       = ieee80211_netdev_select_queue,
 715         .ndo_get_stats64        = ieee80211_get_stats64,
 716 };
 717
 718 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 719                                           struct sk_buff *skb,
 720                                           struct net_device *sb_dev)
 721 {
 722         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 723         struct ieee80211_local *local = sdata->local;
 724         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 725         struct ieee80211_hdr *hdr;
 726         int len_rthdr;
 727
 728         if (local->hw.queues < IEEE80211_NUM_ACS)
 729                 return 0;
 730
 731         /* reset flags and info before parsing radiotap header */
 732         memset(info, 0, sizeof(*info));
 733
 734         if (!ieee80211_parse_tx_radiotap(skb, dev))
 735                 return 0; /* doesn't matter, frame will be dropped */
 736
 737         len_rthdr = ieee80211_get_radiotap_len(skb->data);
 738         hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
 739         if (skb->len < len_rthdr + 2 ||
 740             skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
 741                 return 0; /* doesn't matter, frame will be dropped */
 742
 743         return ieee80211_select_queue_80211(sdata, skb, hdr);
 744 }
 745
 746 static const struct net_device_ops ieee80211_monitorif_ops = {
 747         .ndo_open               = ieee80211_open,
 748         .ndo_stop               = ieee80211_stop,
 749         .ndo_uninit             = ieee80211_uninit,
 750         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 751         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 752         .ndo_set_mac_address    = ieee80211_change_mac,
 753         .ndo_select_queue       = ieee80211_monitor_select_queue,
 754         .ndo_get_stats64        = ieee80211_get_stats64,
 755 };
 756
 757 static const struct net_device_ops ieee80211_dataif_8023_ops = {
 758         .ndo_open               = ieee80211_open,
 759         .ndo_stop               = ieee80211_stop,
 760         .ndo_uninit             = ieee80211_uninit,
 761         .ndo_start_xmit         = ieee80211_subif_start_xmit_8023,
 762         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 763         .ndo_set_mac_address    = ieee80211_change_mac,
 764         .ndo_select_queue       = ieee80211_netdev_select_queue,
 765         .ndo_get_stats64        = ieee80211_get_stats64,
 766 };
 767
 768 static bool ieee80211_iftype_supports_encap_offload(enum nl80211_iftype iftype)
 769 {
 770         switch (iftype) {
 771         /* P2P GO and client are mapped to AP/STATION types */
 772         case NL80211_IFTYPE_AP:
 773         case NL80211_IFTYPE_STATION:
 774                 return true;
 775         default:
 776                 return false;
 777         }
 778 }
 779
 780 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
 781 {
 782         struct ieee80211_local *local = sdata->local;
 783         u32 flags;
 784
 785         flags = sdata->vif.offload_flags;
 786
 787         if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
 788             ieee80211_iftype_supports_encap_offload(sdata->vif.type)) {
 789                 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
 790
 791                 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
 792                     local->hw.wiphy->frag_threshold != (u32)-1)
 793                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 794
 795                 if (local->monitors)
 796                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 797         } else {
 798                 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 799         }
 800
 801         if (sdata->vif.offload_flags == flags)
 802                 return false;
 803
 804         sdata->vif.offload_flags = flags;
 805         return true;
 806 }
 807
 808 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
 809 {
 810         struct ieee80211_local *local = sdata->local;
 811         struct ieee80211_sub_if_data *bss = sdata;
 812         bool enabled;
 813
 814         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 815                 if (!sdata->bss)
 816                         return;
 817
 818                 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
 819         }
 820
 821         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
 822             !ieee80211_iftype_supports_encap_offload(bss->vif.type))
 823                 return;
 824
 825         enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
 826         if (sdata->wdev.use_4addr &&
 827             !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
 828                 enabled = false;
 829
 830         sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
 831                                            &ieee80211_dataif_ops;
 832 }
 833
 834 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
 835 {
 836         struct ieee80211_local *local = sdata->local;
 837         struct ieee80211_sub_if_data *vsdata;
 838
 839         if (ieee80211_set_sdata_offload_flags(sdata)) {
 840                 drv_update_vif_offload(local, sdata);
 841                 ieee80211_set_vif_encap_ops(sdata);
 842         }
 843
 844         list_for_each_entry(vsdata, &local->interfaces, list) {
 845                 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
 846                     vsdata->bss != &sdata->u.ap)
 847                         continue;
 848
 849                 ieee80211_set_vif_encap_ops(vsdata);
 850         }
 851 }
 852
 853 void ieee80211_recalc_offload(struct ieee80211_local *local)
 854 {
 855         struct ieee80211_sub_if_data *sdata;
 856
 857         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
 858                 return;
 859
 860         mutex_lock(&local->iflist_mtx);
 861
 862         list_for_each_entry(sdata, &local->interfaces, list) {
 863                 if (!ieee80211_sdata_running(sdata))
 864                         continue;
 865
 866                 ieee80211_recalc_sdata_offload(sdata);
 867         }
 868
 869         mutex_unlock(&local->iflist_mtx);
 870 }
 871
 872 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 873                                     const int offset)
 874 {
 875         struct ieee80211_local *local = sdata->local;
 876         u32 flags = sdata->u.mntr.flags;
 877
 878 #define ADJUST(_f, _s)  do {                                    \
 879         if (flags & MONITOR_FLAG_##_f)                          \
 880                 local->fif_##_s += offset;                      \
 881         } while (0)
 882
 883         ADJUST(FCSFAIL, fcsfail);
 884         ADJUST(PLCPFAIL, plcpfail);
 885         ADJUST(CONTROL, control);
 886         ADJUST(CONTROL, pspoll);
 887         ADJUST(OTHER_BSS, other_bss);
 888
 889 #undef ADJUST
 890 }
 891
 892 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 893 {
 894         struct ieee80211_local *local = sdata->local;
 895         int i;
 896
 897         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 898                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
 899                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 900                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 901                         sdata->vif.hw_queue[i] = i;
 902                 else
 903                         sdata->vif.hw_queue[i] = 0;
 904         }
 905         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 906 }
 907
 908 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 909 {
 910         struct ieee80211_sub_if_data *sdata;
 911         int ret;
 912
 913         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 914                 return 0;
 915
 916         ASSERT_RTNL();
 917
 918         if (local->monitor_sdata)
 919                 return 0;
 920
 921         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 922         if (!sdata)
 923                 return -ENOMEM;
 924
 925         /* set up data */
 926         sdata->local = local;
 927         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 928         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 929                  wiphy_name(local->hw.wiphy));
 930         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
 931
 932         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 933
 934         ieee80211_set_default_queues(sdata);
 935
 936         ret = drv_add_interface(local, sdata);
 937         if (WARN_ON(ret)) {
 938                 /* ok .. stupid driver, it asked for this! */
 939                 kfree(sdata);
 940                 return ret;
 941         }
 942
 943         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 944
 945         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 946         if (ret) {
 947                 kfree(sdata);
 948                 return ret;
 949         }
 950
 951         mutex_lock(&local->iflist_mtx);
 952         rcu_assign_pointer(local->monitor_sdata, sdata);
 953         mutex_unlock(&local->iflist_mtx);
 954
 955         mutex_lock(&local->mtx);
 956         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 957                                         IEEE80211_CHANCTX_EXCLUSIVE);
 958         mutex_unlock(&local->mtx);
 959         if (ret) {
 960                 mutex_lock(&local->iflist_mtx);
 961                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
 962                 mutex_unlock(&local->iflist_mtx);
 963                 synchronize_net();
 964                 drv_remove_interface(local, sdata);
 965                 kfree(sdata);
 966                 return ret;
 967         }
 968
 969         skb_queue_head_init(&sdata->skb_queue);
 970         INIT_WORK(&sdata->work, ieee80211_iface_work);
 971
 972         return 0;
 973 }
 974
 975 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 976 {
 977         struct ieee80211_sub_if_data *sdata;
 978
 979         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 980                 return;
 981
 982         ASSERT_RTNL();
 983
 984         mutex_lock(&local->iflist_mtx);
 985
 986         sdata = rcu_dereference_protected(local->monitor_sdata,
 987                                           lockdep_is_held(&local->iflist_mtx));
 988         if (!sdata) {
 989                 mutex_unlock(&local->iflist_mtx);
 990                 return;
 991         }
 992
 993         RCU_INIT_POINTER(local->monitor_sdata, NULL);
 994         mutex_unlock(&local->iflist_mtx);
 995
 996         synchronize_net();
 997
 998         mutex_lock(&local->mtx);
 999         ieee80211_vif_release_channel(sdata);
1000         mutex_unlock(&local->mtx);
1001
1002         drv_remove_interface(local, sdata);
1003
1004         kfree(sdata);
1005 }
1006
1007 /*
1008  * NOTE: Be very careful when changing this function, it must NOT return
1009  * an error on interface type changes that have been pre-checked, so most
1010  * checks should be in ieee80211_check_concurrent_iface.
1011  */
1012 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1013 {
1014         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1015         struct net_device *dev = wdev->netdev;
1016         struct ieee80211_local *local = sdata->local;
1017         u32 changed = 0;
1018         int res;
1019         u32 hw_reconf_flags = 0;
1020
1021         switch (sdata->vif.type) {
1022         case NL80211_IFTYPE_AP_VLAN: {
1023                 struct ieee80211_sub_if_data *master;
1024
1025                 if (!sdata->bss)
1026                         return -ENOLINK;
1027
1028                 mutex_lock(&local->mtx);
1029                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1030                 mutex_unlock(&local->mtx);
1031
1032                 master = container_of(sdata->bss,
1033                                       struct ieee80211_sub_if_data, u.ap);
1034                 sdata->control_port_protocol =
1035                         master->control_port_protocol;
1036                 sdata->control_port_no_encrypt =
1037                         master->control_port_no_encrypt;
1038                 sdata->control_port_over_nl80211 =
1039                         master->control_port_over_nl80211;
1040                 sdata->control_port_no_preauth =
1041                         master->control_port_no_preauth;
1042                 sdata->vif.cab_queue = master->vif.cab_queue;
1043                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1044                        sizeof(sdata->vif.hw_queue));
1045                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1046
1047                 mutex_lock(&local->key_mtx);
1048                 sdata->crypto_tx_tailroom_needed_cnt +=
1049                         master->crypto_tx_tailroom_needed_cnt;
1050                 mutex_unlock(&local->key_mtx);
1051
1052                 break;
1053                 }
1054         case NL80211_IFTYPE_AP:
1055                 sdata->bss = &sdata->u.ap;
1056                 break;
1057         case NL80211_IFTYPE_MESH_POINT:
1058         case NL80211_IFTYPE_STATION:
1059         case NL80211_IFTYPE_MONITOR:
1060         case NL80211_IFTYPE_ADHOC:
1061         case NL80211_IFTYPE_P2P_DEVICE:
1062         case NL80211_IFTYPE_OCB:
1063         case NL80211_IFTYPE_NAN:
1064                 /* no special treatment */
1065                 break;
1066         case NL80211_IFTYPE_UNSPECIFIED:
1067         case NUM_NL80211_IFTYPES:
1068         case NL80211_IFTYPE_P2P_CLIENT:
1069         case NL80211_IFTYPE_P2P_GO:
1070         case NL80211_IFTYPE_WDS:
1071                 /* cannot happen */
1072                 WARN_ON(1);
1073                 break;
1074         }
1075
1076         if (local->open_count == 0) {
1077                 res = drv_start(local);
1078                 if (res)
1079                         goto err_del_bss;
1080                 /* we're brought up, everything changes */
1081                 hw_reconf_flags = ~0;
1082                 ieee80211_led_radio(local, true);
1083                 ieee80211_mod_tpt_led_trig(local,
1084                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1085         }
1086
1087         /*
1088          * Copy the hopefully now-present MAC address to
1089          * this interface, if it has the special null one.
1090          */
1091         if (dev && is_zero_ether_addr(dev->dev_addr)) {
1092                 memcpy(dev->dev_addr,
1093                        local->hw.wiphy->perm_addr,
1094                        ETH_ALEN);
1095                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1096
1097                 if (!is_valid_ether_addr(dev->dev_addr)) {
1098                         res = -EADDRNOTAVAIL;
1099                         goto err_stop;
1100                 }
1101         }
1102
1103         switch (sdata->vif.type) {
1104         case NL80211_IFTYPE_AP_VLAN:
1105                 /* no need to tell driver, but set carrier and chanctx */
1106                 if (rtnl_dereference(sdata->bss->beacon)) {
1107                         ieee80211_vif_vlan_copy_chanctx(sdata);
1108                         netif_carrier_on(dev);
1109                         ieee80211_set_vif_encap_ops(sdata);
1110                 } else {
1111                         netif_carrier_off(dev);
1112                 }
1113                 break;
1114         case NL80211_IFTYPE_MONITOR:
1115                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1116                         local->cooked_mntrs++;
1117                         break;
1118                 }
1119
1120                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1121                         res = drv_add_interface(local, sdata);
1122                         if (res)
1123                                 goto err_stop;
1124                 } else if (local->monitors == 0 && local->open_count == 0) {
1125                         res = ieee80211_add_virtual_monitor(local);
1126                         if (res)
1127                                 goto err_stop;
1128                 }
1129
1130                 /* must be before the call to ieee80211_configure_filter */
1131                 local->monitors++;
1132                 if (local->monitors == 1) {
1133                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1134                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1135                 }
1136
1137                 ieee80211_adjust_monitor_flags(sdata, 1);
1138                 ieee80211_configure_filter(local);
1139                 ieee80211_recalc_offload(local);
1140                 mutex_lock(&local->mtx);
1141                 ieee80211_recalc_idle(local);
1142                 mutex_unlock(&local->mtx);
1143
1144                 netif_carrier_on(dev);
1145                 break;
1146         default:
1147                 if (coming_up) {
1148                         ieee80211_del_virtual_monitor(local);
1149                         ieee80211_set_sdata_offload_flags(sdata);
1150
1151                         res = drv_add_interface(local, sdata);
1152                         if (res)
1153                                 goto err_stop;
1154
1155                         ieee80211_set_vif_encap_ops(sdata);
1156                         res = ieee80211_check_queues(sdata,
1157                                 ieee80211_vif_type_p2p(&sdata->vif));
1158                         if (res)
1159                                 goto err_del_interface;
1160                 }
1161
1162                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1163                         local->fif_pspoll++;
1164                         local->fif_probe_req++;
1165
1166                         ieee80211_configure_filter(local);
1167                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1168                         local->fif_probe_req++;
1169                 }
1170
1171                 if (sdata->vif.probe_req_reg)
1172                         drv_config_iface_filter(local, sdata,
1173                                                 FIF_PROBE_REQ,
1174                                                 FIF_PROBE_REQ);
1175
1176                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1177                     sdata->vif.type != NL80211_IFTYPE_NAN)
1178                         changed |= ieee80211_reset_erp_info(sdata);
1179                 ieee80211_bss_info_change_notify(sdata, changed);
1180
1181                 switch (sdata->vif.type) {
1182                 case NL80211_IFTYPE_STATION:
1183                 case NL80211_IFTYPE_ADHOC:
1184                 case NL80211_IFTYPE_AP:
1185                 case NL80211_IFTYPE_MESH_POINT:
1186                 case NL80211_IFTYPE_OCB:
1187                         netif_carrier_off(dev);
1188                         break;
1189                 case NL80211_IFTYPE_P2P_DEVICE:
1190                 case NL80211_IFTYPE_NAN:
1191                         break;
1192                 default:
1193                         /* not reached */
1194                         WARN_ON(1);
1195                 }
1196
1197                 /*
1198                  * Set default queue parameters so drivers don't
1199                  * need to initialise the hardware if the hardware
1200                  * doesn't start up with sane defaults.
1201                  * Enable QoS for anything but station interfaces.
1202                  */
1203                 ieee80211_set_wmm_default(sdata, true,
1204                         sdata->vif.type != NL80211_IFTYPE_STATION);
1205         }
1206
1207         set_bit(SDATA_STATE_RUNNING, &sdata->state);
1208
1209         switch (sdata->vif.type) {
1210         case NL80211_IFTYPE_P2P_DEVICE:
1211                 rcu_assign_pointer(local->p2p_sdata, sdata);
1212                 break;
1213         case NL80211_IFTYPE_MONITOR:
1214                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1215                         break;
1216                 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1217                 break;
1218         default:
1219                 break;
1220         }
1221
1222         /*
1223          * set_multicast_list will be invoked by the networking core
1224          * which will check whether any increments here were done in
1225          * error and sync them down to the hardware as filter flags.
1226          */
1227         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1228                 atomic_inc(&local->iff_allmultis);
1229
1230         if (coming_up)
1231                 local->open_count++;
1232
1233         if (hw_reconf_flags)
1234                 ieee80211_hw_config(local, hw_reconf_flags);
1235
1236         ieee80211_recalc_ps(local);
1237
1238         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1239             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1240             local->ops->wake_tx_queue) {
1241                 /* XXX: for AP_VLAN, actually track AP queues */
1242                 if (dev)
1243                         netif_tx_start_all_queues(dev);
1244         } else if (dev) {
1245                 unsigned long flags;
1246                 int n_acs = IEEE80211_NUM_ACS;
1247                 int ac;
1248
1249                 if (local->hw.queues < IEEE80211_NUM_ACS)
1250                         n_acs = 1;
1251
1252                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1253                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
1254                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
1255                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
1256                         for (ac = 0; ac < n_acs; ac++) {
1257                                 int ac_queue = sdata->vif.hw_queue[ac];
1258
1259                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
1260                                     skb_queue_empty(&local->pending[ac_queue]))
1261                                         netif_start_subqueue(dev, ac);
1262                         }
1263                 }
1264                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1265         }
1266
1267         return 0;
1268  err_del_interface:
1269         drv_remove_interface(local, sdata);
1270  err_stop:
1271         if (!local->open_count)
1272                 drv_stop(local);
1273  err_del_bss:
1274         sdata->bss = NULL;
1275         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1276                 mutex_lock(&local->mtx);
1277                 list_del(&sdata->u.vlan.list);
1278                 mutex_unlock(&local->mtx);
1279         }
1280         /* might already be clear but that doesn't matter */
1281         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1282         return res;
1283 }
1284
1285 static void ieee80211_if_free(struct net_device *dev)
1286 {
1287         free_percpu(dev->tstats);
1288 }
1289
1290 static void ieee80211_if_setup(struct net_device *dev)
1291 {
1292         ether_setup(dev);
1293         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1294         dev->netdev_ops = &ieee80211_dataif_ops;
1295         dev->needs_free_netdev = true;
1296         dev->priv_destructor = ieee80211_if_free;
1297 }
1298
1299 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1300 {
1301         ieee80211_if_setup(dev);
1302         dev->priv_flags |= IFF_NO_QUEUE;
1303 }
1304
1305 static void ieee80211_iface_work(struct work_struct *work)
1306 {
1307         struct ieee80211_sub_if_data *sdata =
1308                 container_of(work, struct ieee80211_sub_if_data, work);
1309         struct ieee80211_local *local = sdata->local;
1310         struct sk_buff *skb;
1311         struct sta_info *sta;
1312
1313         if (!ieee80211_sdata_running(sdata))
1314                 return;
1315
1316         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1317                 return;
1318
1319         if (!ieee80211_can_run_worker(local))
1320                 return;
1321
1322         /* first process frames */
1323         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1324                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1325
1326                 kcov_remote_start_common(skb_get_kcov_handle(skb));
1327                 if (ieee80211_is_action(mgmt->frame_control) &&
1328                     mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1329                         int len = skb->len;
1330
1331                         mutex_lock(&local->sta_mtx);
1332                         sta = sta_info_get_bss(sdata, mgmt->sa);
1333                         if (sta) {
1334                                 switch (mgmt->u.action.u.addba_req.action_code) {
1335                                 case WLAN_ACTION_ADDBA_REQ:
1336                                         ieee80211_process_addba_request(
1337                                                         local, sta, mgmt, len);
1338                                         break;
1339                                 case WLAN_ACTION_ADDBA_RESP:
1340                                         ieee80211_process_addba_resp(local, sta,
1341                                                                      mgmt, len);
1342                                         break;
1343                                 case WLAN_ACTION_DELBA:
1344                                         ieee80211_process_delba(sdata, sta,
1345                                                                 mgmt, len);
1346                                         break;
1347                                 default:
1348                                         WARN_ON(1);
1349                                         break;
1350                                 }
1351                         }
1352                         mutex_unlock(&local->sta_mtx);
1353                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1354                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1355                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1356                         case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1357                                 struct ieee80211_rx_status *status;
1358                                 enum nl80211_band band;
1359                                 u8 opmode;
1360
1361                                 status = IEEE80211_SKB_RXCB(skb);
1362                                 band = status->band;
1363                                 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1364
1365                                 mutex_lock(&local->sta_mtx);
1366                                 sta = sta_info_get_bss(sdata, mgmt->sa);
1367
1368                                 if (sta)
1369                                         ieee80211_vht_handle_opmode(sdata, sta,
1370                                                                     opmode,
1371                                                                     band);
1372
1373                                 mutex_unlock(&local->sta_mtx);
1374                                 break;
1375                         }
1376                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1377                                 ieee80211_process_mu_groups(sdata, mgmt);
1378                                 break;
1379                         default:
1380                                 WARN_ON(1);
1381                                 break;
1382                         }
1383                 } else if (ieee80211_is_ext(mgmt->frame_control)) {
1384                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
1385                                 ieee80211_sta_rx_queued_ext(sdata, skb);
1386                         else
1387                                 WARN_ON(1);
1388                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1389                         struct ieee80211_hdr *hdr = (void *)mgmt;
1390                         /*
1391                          * So the frame isn't mgmt, but frame_control
1392                          * is at the right place anyway, of course, so
1393                          * the if statement is correct.
1394                          *
1395                          * Warn if we have other data frame types here,
1396                          * they must not get here.
1397                          */
1398                         WARN_ON(hdr->frame_control &
1399                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1400                         WARN_ON(!(hdr->seq_ctrl &
1401                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1402                         /*
1403                          * This was a fragment of a frame, received while
1404                          * a block-ack session was active. That cannot be
1405                          * right, so terminate the session.
1406                          */
1407                         mutex_lock(&local->sta_mtx);
1408                         sta = sta_info_get_bss(sdata, mgmt->sa);
1409                         if (sta) {
1410                                 u16 tid = ieee80211_get_tid(hdr);
1411
1412                                 __ieee80211_stop_rx_ba_session(
1413                                         sta, tid, WLAN_BACK_RECIPIENT,
1414                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1415                                         true);
1416                         }
1417                         mutex_unlock(&local->sta_mtx);
1418                 } else switch (sdata->vif.type) {
1419                 case NL80211_IFTYPE_STATION:
1420                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1421                         break;
1422                 case NL80211_IFTYPE_ADHOC:
1423                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1424                         break;
1425                 case NL80211_IFTYPE_MESH_POINT:
1426                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1427                                 break;
1428                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1429                         break;
1430                 default:
1431                         WARN(1, "frame for unexpected interface type");
1432                         break;
1433                 }
1434
1435                 kfree_skb(skb);
1436                 kcov_remote_stop();
1437         }
1438
1439         /* then other type-dependent work */
1440         switch (sdata->vif.type) {
1441         case NL80211_IFTYPE_STATION:
1442                 ieee80211_sta_work(sdata);
1443                 break;
1444         case NL80211_IFTYPE_ADHOC:
1445                 ieee80211_ibss_work(sdata);
1446                 break;
1447         case NL80211_IFTYPE_MESH_POINT:
1448                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1449                         break;
1450                 ieee80211_mesh_work(sdata);
1451                 break;
1452         case NL80211_IFTYPE_OCB:
1453                 ieee80211_ocb_work(sdata);
1454                 break;
1455         default:
1456                 break;
1457         }
1458 }
1459
1460 static void ieee80211_recalc_smps_work(struct work_struct *work)
1461 {
1462         struct ieee80211_sub_if_data *sdata =
1463                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1464
1465         ieee80211_recalc_smps(sdata);
1466 }
1467
1468 /*
1469  * Helper function to initialise an interface to a specific type.
1470  */
1471 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1472                                   enum nl80211_iftype type)
1473 {
1474         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1475                                                     0xff, 0xff, 0xff};
1476
1477         /* clear type-dependent union */
1478         memset(&sdata->u, 0, sizeof(sdata->u));
1479
1480         /* and set some type-dependent values */
1481         sdata->vif.type = type;
1482         sdata->vif.p2p = false;
1483         sdata->wdev.iftype = type;
1484
1485         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1486         sdata->control_port_no_encrypt = false;
1487         sdata->control_port_over_nl80211 = false;
1488         sdata->control_port_no_preauth = false;
1489         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1490         sdata->vif.bss_conf.idle = true;
1491         sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1492
1493         sdata->noack_map = 0;
1494
1495         /* only monitor/p2p-device differ */
1496         if (sdata->dev) {
1497                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1498                 sdata->dev->type = ARPHRD_ETHER;
1499         }
1500
1501         skb_queue_head_init(&sdata->skb_queue);
1502         INIT_WORK(&sdata->work, ieee80211_iface_work);
1503         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1504         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1505         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1506         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1507
1508         switch (type) {
1509         case NL80211_IFTYPE_P2P_GO:
1510                 type = NL80211_IFTYPE_AP;
1511                 sdata->vif.type = type;
1512                 sdata->vif.p2p = true;
1513                 fallthrough;
1514         case NL80211_IFTYPE_AP:
1515                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1516                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1517                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1518                 break;
1519         case NL80211_IFTYPE_P2P_CLIENT:
1520                 type = NL80211_IFTYPE_STATION;
1521                 sdata->vif.type = type;
1522                 sdata->vif.p2p = true;
1523                 fallthrough;
1524         case NL80211_IFTYPE_STATION:
1525                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1526                 ieee80211_sta_setup_sdata(sdata);
1527                 break;
1528         case NL80211_IFTYPE_OCB:
1529                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1530                 ieee80211_ocb_setup_sdata(sdata);
1531                 break;
1532         case NL80211_IFTYPE_ADHOC:
1533                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1534                 ieee80211_ibss_setup_sdata(sdata);
1535                 break;
1536         case NL80211_IFTYPE_MESH_POINT:
1537                 if (ieee80211_vif_is_mesh(&sdata->vif))
1538                         ieee80211_mesh_init_sdata(sdata);
1539                 break;
1540         case NL80211_IFTYPE_MONITOR:
1541                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1542                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1543                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1544                                       MONITOR_FLAG_OTHER_BSS;
1545                 break;
1546         case NL80211_IFTYPE_NAN:
1547                 idr_init(&sdata->u.nan.function_inst_ids);
1548                 spin_lock_init(&sdata->u.nan.func_lock);
1549                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1550                 break;
1551         case NL80211_IFTYPE_AP_VLAN:
1552         case NL80211_IFTYPE_P2P_DEVICE:
1553                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1554                 break;
1555         case NL80211_IFTYPE_UNSPECIFIED:
1556         case NL80211_IFTYPE_WDS:
1557         case NUM_NL80211_IFTYPES:
1558                 WARN_ON(1);
1559                 break;
1560         }
1561
1562         ieee80211_debugfs_add_netdev(sdata);
1563 }
1564
1565 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1566                                            enum nl80211_iftype type)
1567 {
1568         struct ieee80211_local *local = sdata->local;
1569         int ret, err;
1570         enum nl80211_iftype internal_type = type;
1571         bool p2p = false;
1572
1573         ASSERT_RTNL();
1574
1575         if (!local->ops->change_interface)
1576                 return -EBUSY;
1577
1578         switch (sdata->vif.type) {
1579         case NL80211_IFTYPE_AP:
1580         case NL80211_IFTYPE_STATION:
1581         case NL80211_IFTYPE_ADHOC:
1582         case NL80211_IFTYPE_OCB:
1583                 /*
1584                  * Could maybe also all others here?
1585                  * Just not sure how that interacts
1586                  * with the RX/config path e.g. for
1587                  * mesh.
1588                  */
1589                 break;
1590         default:
1591                 return -EBUSY;
1592         }
1593
1594         switch (type) {
1595         case NL80211_IFTYPE_AP:
1596         case NL80211_IFTYPE_STATION:
1597         case NL80211_IFTYPE_ADHOC:
1598         case NL80211_IFTYPE_OCB:
1599                 /*
1600                  * Could probably support everything
1601                  * but here.
1602                  */
1603                 break;
1604         case NL80211_IFTYPE_P2P_CLIENT:
1605                 p2p = true;
1606                 internal_type = NL80211_IFTYPE_STATION;
1607                 break;
1608         case NL80211_IFTYPE_P2P_GO:
1609                 p2p = true;
1610                 internal_type = NL80211_IFTYPE_AP;
1611                 break;
1612         default:
1613                 return -EBUSY;
1614         }
1615
1616         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1617         if (ret)
1618                 return ret;
1619
1620         ieee80211_do_stop(sdata, false);
1621
1622         ieee80211_teardown_sdata(sdata);
1623
1624         ieee80211_set_sdata_offload_flags(sdata);
1625         ret = drv_change_interface(local, sdata, internal_type, p2p);
1626         if (ret)
1627                 type = ieee80211_vif_type_p2p(&sdata->vif);
1628
1629         /*
1630          * Ignore return value here, there's not much we can do since
1631          * the driver changed the interface type internally already.
1632          * The warnings will hopefully make driver authors fix it :-)
1633          */
1634         ieee80211_check_queues(sdata, type);
1635
1636         ieee80211_setup_sdata(sdata, type);
1637         ieee80211_set_vif_encap_ops(sdata);
1638
1639         err = ieee80211_do_open(&sdata->wdev, false);
1640         WARN(err, "type change: do_open returned %d", err);
1641
1642         return ret;
1643 }
1644
1645 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1646                              enum nl80211_iftype type)
1647 {
1648         int ret;
1649
1650         ASSERT_RTNL();
1651
1652         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1653                 return 0;
1654
1655         if (ieee80211_sdata_running(sdata)) {
1656                 ret = ieee80211_runtime_change_iftype(sdata, type);
1657                 if (ret)
1658                         return ret;
1659         } else {
1660                 /* Purge and reset type-dependent state. */
1661                 ieee80211_teardown_sdata(sdata);
1662                 ieee80211_setup_sdata(sdata, type);
1663         }
1664
1665         /* reset some values that shouldn't be kept across type changes */
1666         if (type == NL80211_IFTYPE_STATION)
1667                 sdata->u.mgd.use_4addr = false;
1668
1669         return 0;
1670 }
1671
1672 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1673                                        u8 *perm_addr, enum nl80211_iftype type)
1674 {
1675         struct ieee80211_sub_if_data *sdata;
1676         u64 mask, start, addr, val, inc;
1677         u8 *m;
1678         u8 tmp_addr[ETH_ALEN];
1679         int i;
1680
1681         /* default ... something at least */
1682         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1683
1684         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1685             local->hw.wiphy->n_addresses <= 1)
1686                 return;
1687
1688         mutex_lock(&local->iflist_mtx);
1689
1690         switch (type) {
1691         case NL80211_IFTYPE_MONITOR:
1692                 /* doesn't matter */
1693                 break;
1694         case NL80211_IFTYPE_AP_VLAN:
1695                 /* match up with an AP interface */
1696                 list_for_each_entry(sdata, &local->interfaces, list) {
1697                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1698                                 continue;
1699                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1700                         break;
1701                 }
1702                 /* keep default if no AP interface present */
1703                 break;
1704         case NL80211_IFTYPE_P2P_CLIENT:
1705         case NL80211_IFTYPE_P2P_GO:
1706                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1707                         list_for_each_entry(sdata, &local->interfaces, list) {
1708                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1709                                         continue;
1710                                 if (!ieee80211_sdata_running(sdata))
1711                                         continue;
1712                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1713                                 goto out_unlock;
1714                         }
1715                 }
1716                 fallthrough;
1717         default:
1718                 /* assign a new address if possible -- try n_addresses first */
1719                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1720                         bool used = false;
1721
1722                         list_for_each_entry(sdata, &local->interfaces, list) {
1723                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1724                                                      sdata->vif.addr)) {
1725                                         used = true;
1726                                         break;
1727                                 }
1728                         }
1729
1730                         if (!used) {
1731                                 memcpy(perm_addr,
1732                                        local->hw.wiphy->addresses[i].addr,
1733                                        ETH_ALEN);
1734                                 break;
1735                         }
1736                 }
1737
1738                 /* try mask if available */
1739                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1740                         break;
1741
1742                 m = local->hw.wiphy->addr_mask;
1743                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1744                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1745                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1746
1747                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1748                         /* not a contiguous mask ... not handled now! */
1749                         pr_info("not contiguous\n");
1750                         break;
1751                 }
1752
1753                 /*
1754                  * Pick address of existing interface in case user changed
1755                  * MAC address manually, default to perm_addr.
1756                  */
1757                 m = local->hw.wiphy->perm_addr;
1758                 list_for_each_entry(sdata, &local->interfaces, list) {
1759                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1760                                 continue;
1761                         m = sdata->vif.addr;
1762                         break;
1763                 }
1764                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1765                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1766                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1767
1768                 inc = 1ULL<<__ffs64(mask);
1769                 val = (start & mask);
1770                 addr = (start & ~mask) | (val & mask);
1771                 do {
1772                         bool used = false;
1773
1774                         tmp_addr[5] = addr >> 0*8;
1775                         tmp_addr[4] = addr >> 1*8;
1776                         tmp_addr[3] = addr >> 2*8;
1777                         tmp_addr[2] = addr >> 3*8;
1778                         tmp_addr[1] = addr >> 4*8;
1779                         tmp_addr[0] = addr >> 5*8;
1780
1781                         val += inc;
1782
1783                         list_for_each_entry(sdata, &local->interfaces, list) {
1784                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1785                                         used = true;
1786                                         break;
1787                                 }
1788                         }
1789
1790                         if (!used) {
1791                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1792                                 break;
1793                         }
1794                         addr = (start & ~mask) | (val & mask);
1795                 } while (addr != start);
1796
1797                 break;
1798         }
1799
1800  out_unlock:
1801         mutex_unlock(&local->iflist_mtx);
1802 }
1803
1804 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1805                      unsigned char name_assign_type,
1806                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1807                      struct vif_params *params)
1808 {
1809         struct net_device *ndev = NULL;
1810         struct ieee80211_sub_if_data *sdata = NULL;
1811         struct txq_info *txqi;
1812         void (*if_setup)(struct net_device *dev);
1813         int ret, i;
1814         int txqs = 1;
1815
1816         ASSERT_RTNL();
1817
1818         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1819                 struct wireless_dev *wdev;
1820
1821                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1822                                 GFP_KERNEL);
1823                 if (!sdata)
1824                         return -ENOMEM;
1825                 wdev = &sdata->wdev;
1826
1827                 sdata->dev = NULL;
1828                 strlcpy(sdata->name, name, IFNAMSIZ);
1829                 ieee80211_assign_perm_addr(local, wdev->address, type);
1830                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1831         } else {
1832                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1833                                  sizeof(void *));
1834                 int txq_size = 0;
1835
1836                 if (local->ops->wake_tx_queue &&
1837                     type != NL80211_IFTYPE_AP_VLAN &&
1838                     (type != NL80211_IFTYPE_MONITOR ||
1839                      (params->flags & MONITOR_FLAG_ACTIVE)))
1840                         txq_size += sizeof(struct txq_info) +
1841                                     local->hw.txq_data_size;
1842
1843                 if (local->ops->wake_tx_queue) {
1844                         if_setup = ieee80211_if_setup_no_queue;
1845                 } else {
1846                         if_setup = ieee80211_if_setup;
1847                         if (local->hw.queues >= IEEE80211_NUM_ACS)
1848                                 txqs = IEEE80211_NUM_ACS;
1849                 }
1850
1851                 ndev = alloc_netdev_mqs(size + txq_size,
1852                                         name, name_assign_type,
1853                                         if_setup, txqs, 1);
1854                 if (!ndev)
1855                         return -ENOMEM;
1856
1857                 if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len)
1858                         ndev->tx_queue_len = local->hw.wiphy->tx_queue_len;
1859
1860                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1861
1862                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1863                 if (!ndev->tstats) {
1864                         free_netdev(ndev);
1865                         return -ENOMEM;
1866                 }
1867
1868                 ndev->needed_headroom = local->tx_headroom +
1869                                         4*6 /* four MAC addresses */
1870                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1871                                         + 6 /* mesh */
1872                                         + 8 /* rfc1042/bridge tunnel */
1873                                         - ETH_HLEN /* ethernet hard_header_len */
1874                                         + IEEE80211_ENCRYPT_HEADROOM;
1875                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1876
1877                 ret = dev_alloc_name(ndev, ndev->name);
1878                 if (ret < 0) {
1879                         ieee80211_if_free(ndev);
1880                         free_netdev(ndev);
1881                         return ret;
1882                 }
1883
1884                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1885                 if (is_valid_ether_addr(params->macaddr))
1886                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1887                 else
1888                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1889                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1890
1891                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1892                 sdata = netdev_priv(ndev);
1893                 ndev->ieee80211_ptr = &sdata->wdev;
1894                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1895                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1896
1897                 if (txq_size) {
1898                         txqi = netdev_priv(ndev) + size;
1899                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1900                 }
1901
1902                 sdata->dev = ndev;
1903         }
1904
1905         /* initialise type-independent data */
1906         sdata->wdev.wiphy = local->hw.wiphy;
1907         sdata->local = local;
1908
1909         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1910                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1911
1912         INIT_LIST_HEAD(&sdata->key_list);
1913
1914         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1915                           ieee80211_dfs_cac_timer_work);
1916         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1917                           ieee80211_delayed_tailroom_dec);
1918
1919         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1920                 struct ieee80211_supported_band *sband;
1921                 sband = local->hw.wiphy->bands[i];
1922                 sdata->rc_rateidx_mask[i] =
1923                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1924                 if (sband) {
1925                         __le16 cap;
1926                         u16 *vht_rate_mask;
1927
1928                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1929                                sband->ht_cap.mcs.rx_mask,
1930                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1931
1932                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1933                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1934                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1935                 } else {
1936                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1937                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1938                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1939                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1940                 }
1941         }
1942
1943         ieee80211_set_default_queues(sdata);
1944
1945         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1946         sdata->user_power_level = local->user_power_level;
1947
1948         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1949
1950         /* setup type-dependent data */
1951         ieee80211_setup_sdata(sdata, type);
1952
1953         if (ndev) {
1954                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1955                 if (type == NL80211_IFTYPE_STATION)
1956                         sdata->u.mgd.use_4addr = params->use_4addr;
1957
1958                 ndev->features |= local->hw.netdev_features;
1959                 ndev->hw_features |= ndev->features &
1960                                         MAC80211_SUPPORTED_FEATURES_TX;
1961
1962                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1963
1964                 /* MTU range: 256 - 2304 */
1965                 ndev->min_mtu = 256;
1966                 ndev->max_mtu = local->hw.max_mtu;
1967
1968                 ret = register_netdevice(ndev);
1969                 if (ret) {
1970                         free_netdev(ndev);
1971                         return ret;
1972                 }
1973         }
1974
1975         mutex_lock(&local->iflist_mtx);
1976         list_add_tail_rcu(&sdata->list, &local->interfaces);
1977         mutex_unlock(&local->iflist_mtx);
1978
1979         if (new_wdev)
1980                 *new_wdev = &sdata->wdev;
1981
1982         return 0;
1983 }
1984
1985 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
1986 {
1987         ASSERT_RTNL();
1988
1989         mutex_lock(&sdata->local->iflist_mtx);
1990         list_del_rcu(&sdata->list);
1991         mutex_unlock(&sdata->local->iflist_mtx);
1992
1993         if (sdata->vif.txq)
1994                 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
1995
1996         synchronize_rcu();
1997
1998         if (sdata->dev) {
1999                 unregister_netdevice(sdata->dev);
2000         } else {
2001                 cfg80211_unregister_wdev(&sdata->wdev);
2002                 ieee80211_teardown_sdata(sdata);
2003                 kfree(sdata);
2004         }
2005 }
2006
2007 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2008 {
2009         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2010                 return;
2011         ieee80211_do_stop(sdata, true);
2012 }
2013
2014 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2015 {
2016         struct ieee80211_sub_if_data *sdata, *tmp;
2017         LIST_HEAD(unreg_list);
2018         LIST_HEAD(wdev_list);
2019
2020         ASSERT_RTNL();
2021
2022         /* Before destroying the interfaces, make sure they're all stopped so
2023          * that the hardware is stopped. Otherwise, the driver might still be
2024          * iterating the interfaces during the shutdown, e.g. from a worker
2025          * or from RX processing or similar, and if it does so (using atomic
2026          * iteration) while we're manipulating the list, the iteration will
2027          * crash.
2028          *
2029          * After this, the hardware should be stopped and the driver should
2030          * have stopped all of its activities, so that we can do RCU-unaware
2031          * manipulations of the interface list below.
2032          */
2033         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2034
2035         WARN(local->open_count, "%s: open count remains %d\n",
2036              wiphy_name(local->hw.wiphy), local->open_count);
2037
2038         ieee80211_txq_teardown_flows(local);
2039
2040         mutex_lock(&local->iflist_mtx);
2041         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
2042                 list_del(&sdata->list);
2043
2044                 if (sdata->dev)
2045                         unregister_netdevice_queue(sdata->dev, &unreg_list);
2046                 else
2047                         list_add(&sdata->list, &wdev_list);
2048         }
2049         mutex_unlock(&local->iflist_mtx);
2050         unregister_netdevice_many(&unreg_list);
2051
2052         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2053                 list_del(&sdata->list);
2054                 cfg80211_unregister_wdev(&sdata->wdev);
2055                 kfree(sdata);
2056         }
2057 }
2058
2059 static int netdev_notify(struct notifier_block *nb,
2060                          unsigned long state, void *ptr)
2061 {
2062         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2063         struct ieee80211_sub_if_data *sdata;
2064
2065         if (state != NETDEV_CHANGENAME)
2066                 return NOTIFY_DONE;
2067
2068         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2069                 return NOTIFY_DONE;
2070
2071         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2072                 return NOTIFY_DONE;
2073
2074         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2075         memcpy(sdata->name, dev->name, IFNAMSIZ);
2076         ieee80211_debugfs_rename_netdev(sdata);
2077
2078         return NOTIFY_OK;
2079 }
2080
2081 static struct notifier_block mac80211_netdev_notifier = {
2082         .notifier_call = netdev_notify,
2083 };
2084
2085 int ieee80211_iface_init(void)
2086 {
2087         return register_netdevice_notifier(&mac80211_netdev_notifier);
2088 }
2089
2090 void ieee80211_iface_exit(void)
2091 {
2092         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2093 }
2094
2095 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2096 {
2097         if (sdata->vif.type == NL80211_IFTYPE_AP)
2098                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2099         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2100                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2101 }
2102
2103 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2104 {
2105         if (sdata->vif.type == NL80211_IFTYPE_AP)
2106                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2107         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2108                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2109 }