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 <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
 466         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 467
 468         if (sdata->wdev.cac_started) {
 469                 chandef = sdata->vif.bss_conf.chandef;
 470                 WARN_ON(local->suspended);
 471                 mutex_lock(&local->mtx);
 472                 ieee80211_vif_release_channel(sdata);
 473                 mutex_unlock(&local->mtx);
 474                 cfg80211_cac_event(sdata->dev, &chandef,
 475                                    NL80211_RADAR_CAC_ABORTED,
 476                                    GFP_KERNEL);
 477         }
 478
 479         /* APs need special treatment */
 480         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 481                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 482
 483                 /* down all dependent devices, that is VLANs */
 484                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 485                                          u.vlan.list)
 486                         dev_close(vlan->dev);
 487                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 488         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 489                 /* remove all packets in parent bc_buf pointing to this dev */
 490                 ps = &sdata->bss->ps;
 491
 492                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 493                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 494                         if (skb->dev == sdata->dev) {
 495                                 __skb_unlink(skb, &ps->bc_buf);
 496                                 local->total_ps_buffered--;
 497                                 ieee80211_free_txskb(&local->hw, skb);
 498                         }
 499                 }
 500                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 501         }
 502
 503         if (going_down)
 504                 local->open_count--;
 505
 506         switch (sdata->vif.type) {
 507         case NL80211_IFTYPE_AP_VLAN:
 508                 mutex_lock(&local->mtx);
 509                 list_del(&sdata->u.vlan.list);
 510                 mutex_unlock(&local->mtx);
 511                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 512                 /* see comment in the default case below */
 513                 ieee80211_free_keys(sdata, true);
 514                 /* no need to tell driver */
 515                 break;
 516         case NL80211_IFTYPE_MONITOR:
 517                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 518                         local->cooked_mntrs--;
 519                         break;
 520                 }
 521
 522                 local->monitors--;
 523                 if (local->monitors == 0) {
 524                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 525                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 526                 }
 527
 528                 ieee80211_adjust_monitor_flags(sdata, -1);
 529                 break;
 530         case NL80211_IFTYPE_NAN:
 531                 /* clean all the functions */
 532                 spin_lock_bh(&sdata->u.nan.func_lock);
 533
 534                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
 535                         idr_remove(&sdata->u.nan.function_inst_ids, i);
 536                         cfg80211_free_nan_func(func);
 537                 }
 538                 idr_destroy(&sdata->u.nan.function_inst_ids);
 539
 540                 spin_unlock_bh(&sdata->u.nan.func_lock);
 541                 break;
 542         case NL80211_IFTYPE_P2P_DEVICE:
 543                 /* relies on synchronize_rcu() below */
 544                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 545                 fallthrough;
 546         default:
 547                 cancel_work_sync(&sdata->work);
 548                 /*
 549                  * When we get here, the interface is marked down.
 550                  * Free the remaining keys, if there are any
 551                  * (which can happen in AP mode if userspace sets
 552                  * keys before the interface is operating)
 553                  *
 554                  * Force the key freeing to always synchronize_net()
 555                  * to wait for the RX path in case it is using this
 556                  * interface enqueuing frames at this very time on
 557                  * another CPU.
 558                  */
 559                 ieee80211_free_keys(sdata, true);
 560                 skb_queue_purge(&sdata->skb_queue);
 561         }
 562
 563         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 564         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 565                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 566                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 567                         if (info->control.vif == &sdata->vif) {
 568                                 __skb_unlink(skb, &local->pending[i]);
 569                                 ieee80211_free_txskb(&local->hw, skb);
 570                         }
 571                 }
 572         }
 573         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 574
 575         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 576                 ieee80211_txq_remove_vlan(local, sdata);
 577
 578         sdata->bss = NULL;
 579
 580         if (local->open_count == 0)
 581                 ieee80211_clear_tx_pending(local);
 582
 583         sdata->vif.bss_conf.beacon_int = 0;
 584
 585         /*
 586          * If the interface goes down while suspended, presumably because
 587          * the device was unplugged and that happens before our resume,
 588          * then the driver is already unconfigured and the remainder of
 589          * this function isn't needed.
 590          * XXX: what about WoWLAN? If the device has software state, e.g.
 591          *      memory allocated, it might expect teardown commands from
 592          *      mac80211 here?
 593          */
 594         if (local->suspended) {
 595                 WARN_ON(local->wowlan);
 596                 WARN_ON(rtnl_dereference(local->monitor_sdata));
 597                 return;
 598         }
 599
 600         switch (sdata->vif.type) {
 601         case NL80211_IFTYPE_AP_VLAN:
 602                 break;
 603         case NL80211_IFTYPE_MONITOR:
 604                 if (local->monitors == 0)
 605                         ieee80211_del_virtual_monitor(local);
 606
 607                 mutex_lock(&local->mtx);
 608                 ieee80211_recalc_idle(local);
 609                 mutex_unlock(&local->mtx);
 610
 611                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 612                         break;
 613
 614                 fallthrough;
 615         default:
 616                 if (going_down)
 617                         drv_remove_interface(local, sdata);
 618         }
 619
 620         ieee80211_recalc_ps(local);
 621
 622         if (cancel_scan)
 623                 flush_delayed_work(&local->scan_work);
 624
 625         if (local->open_count == 0) {
 626                 ieee80211_stop_device(local);
 627
 628                 /* no reconfiguring after stop! */
 629                 return;
 630         }
 631
 632         /* do after stop to avoid reconfiguring when we stop anyway */
 633         ieee80211_configure_filter(local);
 634         ieee80211_hw_config(local, hw_reconf_flags);
 635
 636         if (local->monitors == local->open_count)
 637                 ieee80211_add_virtual_monitor(local);
 638 }
 639
 640 static int ieee80211_stop(struct net_device *dev)
 641 {
 642         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 643
 644         wiphy_lock(sdata->local->hw.wiphy);
 645         ieee80211_do_stop(sdata, true);
 646         wiphy_unlock(sdata->local->hw.wiphy);
 647
 648         return 0;
 649 }
 650
 651 static void ieee80211_set_multicast_list(struct net_device *dev)
 652 {
 653         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 654         struct ieee80211_local *local = sdata->local;
 655         int allmulti, sdata_allmulti;
 656
 657         allmulti = !!(dev->flags & IFF_ALLMULTI);
 658         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 659
 660         if (allmulti != sdata_allmulti) {
 661                 if (dev->flags & IFF_ALLMULTI)
 662                         atomic_inc(&local->iff_allmultis);
 663                 else
 664                         atomic_dec(&local->iff_allmultis);
 665                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 666         }
 667
 668         spin_lock_bh(&local->filter_lock);
 669         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 670         spin_unlock_bh(&local->filter_lock);
 671         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 672 }
 673
 674 /*
 675  * Called when the netdev is removed or, by the code below, before
 676  * the interface type changes.
 677  */
 678 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 679 {
 680         int i;
 681
 682         /* free extra data */
 683         ieee80211_free_keys(sdata, false);
 684
 685         ieee80211_debugfs_remove_netdev(sdata);
 686
 687         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 688                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 689         sdata->fragment_next = 0;
 690
 691         if (ieee80211_vif_is_mesh(&sdata->vif))
 692                 ieee80211_mesh_teardown_sdata(sdata);
 693 }
 694
 695 static void ieee80211_uninit(struct net_device *dev)
 696 {
 697         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
 698 }
 699
 700 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 701                                          struct sk_buff *skb,
 702                                          struct net_device *sb_dev)
 703 {
 704         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 705 }
 706
 707 static void
 708 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 709 {
 710         dev_fetch_sw_netstats(stats, dev->tstats);
 711 }
 712
 713 static const struct net_device_ops ieee80211_dataif_ops = {
 714         .ndo_open               = ieee80211_open,
 715         .ndo_stop               = ieee80211_stop,
 716         .ndo_uninit             = ieee80211_uninit,
 717         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 718         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 719         .ndo_set_mac_address    = ieee80211_change_mac,
 720         .ndo_select_queue       = ieee80211_netdev_select_queue,
 721         .ndo_get_stats64        = ieee80211_get_stats64,
 722 };
 723
 724 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 725                                           struct sk_buff *skb,
 726                                           struct net_device *sb_dev)
 727 {
 728         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 729         struct ieee80211_local *local = sdata->local;
 730         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 731         struct ieee80211_hdr *hdr;
 732         int len_rthdr;
 733
 734         if (local->hw.queues < IEEE80211_NUM_ACS)
 735                 return 0;
 736
 737         /* reset flags and info before parsing radiotap header */
 738         memset(info, 0, sizeof(*info));
 739
 740         if (!ieee80211_parse_tx_radiotap(skb, dev))
 741                 return 0; /* doesn't matter, frame will be dropped */
 742
 743         len_rthdr = ieee80211_get_radiotap_len(skb->data);
 744         hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
 745         if (skb->len < len_rthdr + 2 ||
 746             skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
 747                 return 0; /* doesn't matter, frame will be dropped */
 748
 749         return ieee80211_select_queue_80211(sdata, skb, hdr);
 750 }
 751
 752 static const struct net_device_ops ieee80211_monitorif_ops = {
 753         .ndo_open               = ieee80211_open,
 754         .ndo_stop               = ieee80211_stop,
 755         .ndo_uninit             = ieee80211_uninit,
 756         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 757         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 758         .ndo_set_mac_address    = ieee80211_change_mac,
 759         .ndo_select_queue       = ieee80211_monitor_select_queue,
 760         .ndo_get_stats64        = ieee80211_get_stats64,
 761 };
 762
 763 static const struct net_device_ops ieee80211_dataif_8023_ops = {
 764         .ndo_open               = ieee80211_open,
 765         .ndo_stop               = ieee80211_stop,
 766         .ndo_uninit             = ieee80211_uninit,
 767         .ndo_start_xmit         = ieee80211_subif_start_xmit_8023,
 768         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 769         .ndo_set_mac_address    = ieee80211_change_mac,
 770         .ndo_select_queue       = ieee80211_netdev_select_queue,
 771         .ndo_get_stats64        = ieee80211_get_stats64,
 772 };
 773
 774 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)
 775 {
 776         switch (iftype) {
 777         /* P2P GO and client are mapped to AP/STATION types */
 778         case NL80211_IFTYPE_AP:
 779         case NL80211_IFTYPE_STATION:
 780                 return true;
 781         default:
 782                 return false;
 783         }
 784 }
 785
 786 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
 787 {
 788         struct ieee80211_local *local = sdata->local;
 789         u32 flags;
 790
 791         flags = sdata->vif.offload_flags;
 792
 793         if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
 794             ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
 795                 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
 796
 797                 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
 798                     local->hw.wiphy->frag_threshold != (u32)-1)
 799                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 800
 801                 if (local->monitors)
 802                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 803         } else {
 804                 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 805         }
 806
 807         if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) &&
 808             ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
 809                 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED;
 810
 811                 if (local->monitors &&
 812                     !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP))
 813                         flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
 814         } else {
 815                 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
 816         }
 817
 818         if (sdata->vif.offload_flags == flags)
 819                 return false;
 820
 821         sdata->vif.offload_flags = flags;
 822         ieee80211_check_fast_rx_iface(sdata);
 823         return true;
 824 }
 825
 826 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
 827 {
 828         struct ieee80211_local *local = sdata->local;
 829         struct ieee80211_sub_if_data *bss = sdata;
 830         bool enabled;
 831
 832         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 833                 if (!sdata->bss)
 834                         return;
 835
 836                 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
 837         }
 838
 839         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
 840             !ieee80211_iftype_supports_hdr_offload(bss->vif.type))
 841                 return;
 842
 843         enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
 844         if (sdata->wdev.use_4addr &&
 845             !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
 846                 enabled = false;
 847
 848         sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
 849                                            &ieee80211_dataif_ops;
 850 }
 851
 852 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
 853 {
 854         struct ieee80211_local *local = sdata->local;
 855         struct ieee80211_sub_if_data *vsdata;
 856
 857         if (ieee80211_set_sdata_offload_flags(sdata)) {
 858                 drv_update_vif_offload(local, sdata);
 859                 ieee80211_set_vif_encap_ops(sdata);
 860         }
 861
 862         list_for_each_entry(vsdata, &local->interfaces, list) {
 863                 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
 864                     vsdata->bss != &sdata->u.ap)
 865                         continue;
 866
 867                 ieee80211_set_vif_encap_ops(vsdata);
 868         }
 869 }
 870
 871 void ieee80211_recalc_offload(struct ieee80211_local *local)
 872 {
 873         struct ieee80211_sub_if_data *sdata;
 874
 875         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
 876                 return;
 877
 878         mutex_lock(&local->iflist_mtx);
 879
 880         list_for_each_entry(sdata, &local->interfaces, list) {
 881                 if (!ieee80211_sdata_running(sdata))
 882                         continue;
 883
 884                 ieee80211_recalc_sdata_offload(sdata);
 885         }
 886
 887         mutex_unlock(&local->iflist_mtx);
 888 }
 889
 890 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 891                                     const int offset)
 892 {
 893         struct ieee80211_local *local = sdata->local;
 894         u32 flags = sdata->u.mntr.flags;
 895
 896 #define ADJUST(_f, _s)  do {                                    \
 897         if (flags & MONITOR_FLAG_##_f)                          \
 898                 local->fif_##_s += offset;                      \
 899         } while (0)
 900
 901         ADJUST(FCSFAIL, fcsfail);
 902         ADJUST(PLCPFAIL, plcpfail);
 903         ADJUST(CONTROL, control);
 904         ADJUST(CONTROL, pspoll);
 905         ADJUST(OTHER_BSS, other_bss);
 906
 907 #undef ADJUST
 908 }
 909
 910 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 911 {
 912         struct ieee80211_local *local = sdata->local;
 913         int i;
 914
 915         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 916                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
 917                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 918                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 919                         sdata->vif.hw_queue[i] = i;
 920                 else
 921                         sdata->vif.hw_queue[i] = 0;
 922         }
 923         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 924 }
 925
 926 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 927 {
 928         struct ieee80211_sub_if_data *sdata;
 929         int ret;
 930
 931         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 932                 return 0;
 933
 934         ASSERT_RTNL();
 935
 936         if (local->monitor_sdata)
 937                 return 0;
 938
 939         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 940         if (!sdata)
 941                 return -ENOMEM;
 942
 943         /* set up data */
 944         sdata->local = local;
 945         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 946         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 947                  wiphy_name(local->hw.wiphy));
 948         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
 949
 950         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 951
 952         ieee80211_set_default_queues(sdata);
 953
 954         ret = drv_add_interface(local, sdata);
 955         if (WARN_ON(ret)) {
 956                 /* ok .. stupid driver, it asked for this! */
 957                 kfree(sdata);
 958                 return ret;
 959         }
 960
 961         set_bit(SDATA_STATE_RUNNING, &sdata->state);
 962
 963         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 964         if (ret) {
 965                 kfree(sdata);
 966                 return ret;
 967         }
 968
 969         mutex_lock(&local->iflist_mtx);
 970         rcu_assign_pointer(local->monitor_sdata, sdata);
 971         mutex_unlock(&local->iflist_mtx);
 972
 973         mutex_lock(&local->mtx);
 974         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 975                                         IEEE80211_CHANCTX_EXCLUSIVE);
 976         mutex_unlock(&local->mtx);
 977         if (ret) {
 978                 mutex_lock(&local->iflist_mtx);
 979                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
 980                 mutex_unlock(&local->iflist_mtx);
 981                 synchronize_net();
 982                 drv_remove_interface(local, sdata);
 983                 kfree(sdata);
 984                 return ret;
 985         }
 986
 987         skb_queue_head_init(&sdata->skb_queue);
 988         INIT_WORK(&sdata->work, ieee80211_iface_work);
 989
 990         return 0;
 991 }
 992
 993 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 994 {
 995         struct ieee80211_sub_if_data *sdata;
 996
 997         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 998                 return;
 999
1000         ASSERT_RTNL();
1001
1002         mutex_lock(&local->iflist_mtx);
1003
1004         sdata = rcu_dereference_protected(local->monitor_sdata,
1005                                           lockdep_is_held(&local->iflist_mtx));
1006         if (!sdata) {
1007                 mutex_unlock(&local->iflist_mtx);
1008                 return;
1009         }
1010
1011         RCU_INIT_POINTER(local->monitor_sdata, NULL);
1012         mutex_unlock(&local->iflist_mtx);
1013
1014         synchronize_net();
1015
1016         mutex_lock(&local->mtx);
1017         ieee80211_vif_release_channel(sdata);
1018         mutex_unlock(&local->mtx);
1019
1020         drv_remove_interface(local, sdata);
1021
1022         kfree(sdata);
1023 }
1024
1025 /*
1026  * NOTE: Be very careful when changing this function, it must NOT return
1027  * an error on interface type changes that have been pre-checked, so most
1028  * checks should be in ieee80211_check_concurrent_iface.
1029  */
1030 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1031 {
1032         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1033         struct net_device *dev = wdev->netdev;
1034         struct ieee80211_local *local = sdata->local;
1035         u32 changed = 0;
1036         int res;
1037         u32 hw_reconf_flags = 0;
1038
1039         switch (sdata->vif.type) {
1040         case NL80211_IFTYPE_AP_VLAN: {
1041                 struct ieee80211_sub_if_data *master;
1042
1043                 if (!sdata->bss)
1044                         return -ENOLINK;
1045
1046                 mutex_lock(&local->mtx);
1047                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1048                 mutex_unlock(&local->mtx);
1049
1050                 master = container_of(sdata->bss,
1051                                       struct ieee80211_sub_if_data, u.ap);
1052                 sdata->control_port_protocol =
1053                         master->control_port_protocol;
1054                 sdata->control_port_no_encrypt =
1055                         master->control_port_no_encrypt;
1056                 sdata->control_port_over_nl80211 =
1057                         master->control_port_over_nl80211;
1058                 sdata->control_port_no_preauth =
1059                         master->control_port_no_preauth;
1060                 sdata->vif.cab_queue = master->vif.cab_queue;
1061                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1062                        sizeof(sdata->vif.hw_queue));
1063                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1064
1065                 mutex_lock(&local->key_mtx);
1066                 sdata->crypto_tx_tailroom_needed_cnt +=
1067                         master->crypto_tx_tailroom_needed_cnt;
1068                 mutex_unlock(&local->key_mtx);
1069
1070                 break;
1071                 }
1072         case NL80211_IFTYPE_AP:
1073                 sdata->bss = &sdata->u.ap;
1074                 break;
1075         case NL80211_IFTYPE_MESH_POINT:
1076         case NL80211_IFTYPE_STATION:
1077         case NL80211_IFTYPE_MONITOR:
1078         case NL80211_IFTYPE_ADHOC:
1079         case NL80211_IFTYPE_P2P_DEVICE:
1080         case NL80211_IFTYPE_OCB:
1081         case NL80211_IFTYPE_NAN:
1082                 /* no special treatment */
1083                 break;
1084         case NL80211_IFTYPE_UNSPECIFIED:
1085         case NUM_NL80211_IFTYPES:
1086         case NL80211_IFTYPE_P2P_CLIENT:
1087         case NL80211_IFTYPE_P2P_GO:
1088         case NL80211_IFTYPE_WDS:
1089                 /* cannot happen */
1090                 WARN_ON(1);
1091                 break;
1092         }
1093
1094         if (local->open_count == 0) {
1095                 res = drv_start(local);
1096                 if (res)
1097                         goto err_del_bss;
1098                 /* we're brought up, everything changes */
1099                 hw_reconf_flags = ~0;
1100                 ieee80211_led_radio(local, true);
1101                 ieee80211_mod_tpt_led_trig(local,
1102                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1103         }
1104
1105         /*
1106          * Copy the hopefully now-present MAC address to
1107          * this interface, if it has the special null one.
1108          */
1109         if (dev && is_zero_ether_addr(dev->dev_addr)) {
1110                 memcpy(dev->dev_addr,
1111                        local->hw.wiphy->perm_addr,
1112                        ETH_ALEN);
1113                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1114
1115                 if (!is_valid_ether_addr(dev->dev_addr)) {
1116                         res = -EADDRNOTAVAIL;
1117                         goto err_stop;
1118                 }
1119         }
1120
1121         switch (sdata->vif.type) {
1122         case NL80211_IFTYPE_AP_VLAN:
1123                 /* no need to tell driver, but set carrier and chanctx */
1124                 if (rtnl_dereference(sdata->bss->beacon)) {
1125                         ieee80211_vif_vlan_copy_chanctx(sdata);
1126                         netif_carrier_on(dev);
1127                         ieee80211_set_vif_encap_ops(sdata);
1128                 } else {
1129                         netif_carrier_off(dev);
1130                 }
1131                 break;
1132         case NL80211_IFTYPE_MONITOR:
1133                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1134                         local->cooked_mntrs++;
1135                         break;
1136                 }
1137
1138                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1139                         res = drv_add_interface(local, sdata);
1140                         if (res)
1141                                 goto err_stop;
1142                 } else if (local->monitors == 0 && local->open_count == 0) {
1143                         res = ieee80211_add_virtual_monitor(local);
1144                         if (res)
1145                                 goto err_stop;
1146                 }
1147
1148                 /* must be before the call to ieee80211_configure_filter */
1149                 local->monitors++;
1150                 if (local->monitors == 1) {
1151                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1152                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1153                 }
1154
1155                 ieee80211_adjust_monitor_flags(sdata, 1);
1156                 ieee80211_configure_filter(local);
1157                 ieee80211_recalc_offload(local);
1158                 mutex_lock(&local->mtx);
1159                 ieee80211_recalc_idle(local);
1160                 mutex_unlock(&local->mtx);
1161
1162                 netif_carrier_on(dev);
1163                 break;
1164         default:
1165                 if (coming_up) {
1166                         ieee80211_del_virtual_monitor(local);
1167                         ieee80211_set_sdata_offload_flags(sdata);
1168
1169                         res = drv_add_interface(local, sdata);
1170                         if (res)
1171                                 goto err_stop;
1172
1173                         ieee80211_set_vif_encap_ops(sdata);
1174                         res = ieee80211_check_queues(sdata,
1175                                 ieee80211_vif_type_p2p(&sdata->vif));
1176                         if (res)
1177                                 goto err_del_interface;
1178                 }
1179
1180                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1181                         local->fif_pspoll++;
1182                         local->fif_probe_req++;
1183
1184                         ieee80211_configure_filter(local);
1185                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1186                         local->fif_probe_req++;
1187                 }
1188
1189                 if (sdata->vif.probe_req_reg)
1190                         drv_config_iface_filter(local, sdata,
1191                                                 FIF_PROBE_REQ,
1192                                                 FIF_PROBE_REQ);
1193
1194                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1195                     sdata->vif.type != NL80211_IFTYPE_NAN)
1196                         changed |= ieee80211_reset_erp_info(sdata);
1197                 ieee80211_bss_info_change_notify(sdata, changed);
1198
1199                 switch (sdata->vif.type) {
1200                 case NL80211_IFTYPE_STATION:
1201                 case NL80211_IFTYPE_ADHOC:
1202                 case NL80211_IFTYPE_AP:
1203                 case NL80211_IFTYPE_MESH_POINT:
1204                 case NL80211_IFTYPE_OCB:
1205                         netif_carrier_off(dev);
1206                         break;
1207                 case NL80211_IFTYPE_P2P_DEVICE:
1208                 case NL80211_IFTYPE_NAN:
1209                         break;
1210                 default:
1211                         /* not reached */
1212                         WARN_ON(1);
1213                 }
1214
1215                 /*
1216                  * Set default queue parameters so drivers don't
1217                  * need to initialise the hardware if the hardware
1218                  * doesn't start up with sane defaults.
1219                  * Enable QoS for anything but station interfaces.
1220                  */
1221                 ieee80211_set_wmm_default(sdata, true,
1222                         sdata->vif.type != NL80211_IFTYPE_STATION);
1223         }
1224
1225         set_bit(SDATA_STATE_RUNNING, &sdata->state);
1226
1227         switch (sdata->vif.type) {
1228         case NL80211_IFTYPE_P2P_DEVICE:
1229                 rcu_assign_pointer(local->p2p_sdata, sdata);
1230                 break;
1231         case NL80211_IFTYPE_MONITOR:
1232                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1233                         break;
1234                 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1235                 break;
1236         default:
1237                 break;
1238         }
1239
1240         /*
1241          * set_multicast_list will be invoked by the networking core
1242          * which will check whether any increments here were done in
1243          * error and sync them down to the hardware as filter flags.
1244          */
1245         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1246                 atomic_inc(&local->iff_allmultis);
1247
1248         if (coming_up)
1249                 local->open_count++;
1250
1251         if (hw_reconf_flags)
1252                 ieee80211_hw_config(local, hw_reconf_flags);
1253
1254         ieee80211_recalc_ps(local);
1255
1256         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1257             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1258             local->ops->wake_tx_queue) {
1259                 /* XXX: for AP_VLAN, actually track AP queues */
1260                 if (dev)
1261                         netif_tx_start_all_queues(dev);
1262         } else if (dev) {
1263                 unsigned long flags;
1264                 int n_acs = IEEE80211_NUM_ACS;
1265                 int ac;
1266
1267                 if (local->hw.queues < IEEE80211_NUM_ACS)
1268                         n_acs = 1;
1269
1270                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1271                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
1272                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
1273                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
1274                         for (ac = 0; ac < n_acs; ac++) {
1275                                 int ac_queue = sdata->vif.hw_queue[ac];
1276
1277                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
1278                                     skb_queue_empty(&local->pending[ac_queue]))
1279                                         netif_start_subqueue(dev, ac);
1280                         }
1281                 }
1282                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1283         }
1284
1285         return 0;
1286  err_del_interface:
1287         drv_remove_interface(local, sdata);
1288  err_stop:
1289         if (!local->open_count)
1290                 drv_stop(local);
1291  err_del_bss:
1292         sdata->bss = NULL;
1293         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1294                 mutex_lock(&local->mtx);
1295                 list_del(&sdata->u.vlan.list);
1296                 mutex_unlock(&local->mtx);
1297         }
1298         /* might already be clear but that doesn't matter */
1299         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1300         return res;
1301 }
1302
1303 static void ieee80211_if_free(struct net_device *dev)
1304 {
1305         free_percpu(dev->tstats);
1306 }
1307
1308 static void ieee80211_if_setup(struct net_device *dev)
1309 {
1310         ether_setup(dev);
1311         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1312         dev->netdev_ops = &ieee80211_dataif_ops;
1313         dev->needs_free_netdev = true;
1314         dev->priv_destructor = ieee80211_if_free;
1315 }
1316
1317 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1318 {
1319         ieee80211_if_setup(dev);
1320         dev->priv_flags |= IFF_NO_QUEUE;
1321 }
1322
1323 static void ieee80211_iface_work(struct work_struct *work)
1324 {
1325         struct ieee80211_sub_if_data *sdata =
1326                 container_of(work, struct ieee80211_sub_if_data, work);
1327         struct ieee80211_local *local = sdata->local;
1328         struct sk_buff *skb;
1329         struct sta_info *sta;
1330
1331         if (!ieee80211_sdata_running(sdata))
1332                 return;
1333
1334         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1335                 return;
1336
1337         if (!ieee80211_can_run_worker(local))
1338                 return;
1339
1340         /* first process frames */
1341         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1342                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1343
1344                 kcov_remote_start_common(skb_get_kcov_handle(skb));
1345                 if (ieee80211_is_action(mgmt->frame_control) &&
1346                     mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1347                         int len = skb->len;
1348
1349                         mutex_lock(&local->sta_mtx);
1350                         sta = sta_info_get_bss(sdata, mgmt->sa);
1351                         if (sta) {
1352                                 switch (mgmt->u.action.u.addba_req.action_code) {
1353                                 case WLAN_ACTION_ADDBA_REQ:
1354                                         ieee80211_process_addba_request(
1355                                                         local, sta, mgmt, len);
1356                                         break;
1357                                 case WLAN_ACTION_ADDBA_RESP:
1358                                         ieee80211_process_addba_resp(local, sta,
1359                                                                      mgmt, len);
1360                                         break;
1361                                 case WLAN_ACTION_DELBA:
1362                                         ieee80211_process_delba(sdata, sta,
1363                                                                 mgmt, len);
1364                                         break;
1365                                 default:
1366                                         WARN_ON(1);
1367                                         break;
1368                                 }
1369                         }
1370                         mutex_unlock(&local->sta_mtx);
1371                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1372                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1373                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1374                         case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1375                                 struct ieee80211_rx_status *status;
1376                                 enum nl80211_band band;
1377                                 u8 opmode;
1378
1379                                 status = IEEE80211_SKB_RXCB(skb);
1380                                 band = status->band;
1381                                 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1382
1383                                 mutex_lock(&local->sta_mtx);
1384                                 sta = sta_info_get_bss(sdata, mgmt->sa);
1385
1386                                 if (sta)
1387                                         ieee80211_vht_handle_opmode(sdata, sta,
1388                                                                     opmode,
1389                                                                     band);
1390
1391                                 mutex_unlock(&local->sta_mtx);
1392                                 break;
1393                         }
1394                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1395                                 ieee80211_process_mu_groups(sdata, mgmt);
1396                                 break;
1397                         default:
1398                                 WARN_ON(1);
1399                                 break;
1400                         }
1401                 } else if (ieee80211_is_ext(mgmt->frame_control)) {
1402                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
1403                                 ieee80211_sta_rx_queued_ext(sdata, skb);
1404                         else
1405                                 WARN_ON(1);
1406                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1407                         struct ieee80211_hdr *hdr = (void *)mgmt;
1408                         /*
1409                          * So the frame isn't mgmt, but frame_control
1410                          * is at the right place anyway, of course, so
1411                          * the if statement is correct.
1412                          *
1413                          * Warn if we have other data frame types here,
1414                          * they must not get here.
1415                          */
1416                         WARN_ON(hdr->frame_control &
1417                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1418                         WARN_ON(!(hdr->seq_ctrl &
1419                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1420                         /*
1421                          * This was a fragment of a frame, received while
1422                          * a block-ack session was active. That cannot be
1423                          * right, so terminate the session.
1424                          */
1425                         mutex_lock(&local->sta_mtx);
1426                         sta = sta_info_get_bss(sdata, mgmt->sa);
1427                         if (sta) {
1428                                 u16 tid = ieee80211_get_tid(hdr);
1429
1430                                 __ieee80211_stop_rx_ba_session(
1431                                         sta, tid, WLAN_BACK_RECIPIENT,
1432                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1433                                         true);
1434                         }
1435                         mutex_unlock(&local->sta_mtx);
1436                 } else switch (sdata->vif.type) {
1437                 case NL80211_IFTYPE_STATION:
1438                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1439                         break;
1440                 case NL80211_IFTYPE_ADHOC:
1441                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1442                         break;
1443                 case NL80211_IFTYPE_MESH_POINT:
1444                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1445                                 break;
1446                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1447                         break;
1448                 default:
1449                         WARN(1, "frame for unexpected interface type");
1450                         break;
1451                 }
1452
1453                 kfree_skb(skb);
1454                 kcov_remote_stop();
1455         }
1456
1457         /* then other type-dependent work */
1458         switch (sdata->vif.type) {
1459         case NL80211_IFTYPE_STATION:
1460                 ieee80211_sta_work(sdata);
1461                 break;
1462         case NL80211_IFTYPE_ADHOC:
1463                 ieee80211_ibss_work(sdata);
1464                 break;
1465         case NL80211_IFTYPE_MESH_POINT:
1466                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1467                         break;
1468                 ieee80211_mesh_work(sdata);
1469                 break;
1470         case NL80211_IFTYPE_OCB:
1471                 ieee80211_ocb_work(sdata);
1472                 break;
1473         default:
1474                 break;
1475         }
1476 }
1477
1478 static void ieee80211_recalc_smps_work(struct work_struct *work)
1479 {
1480         struct ieee80211_sub_if_data *sdata =
1481                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1482
1483         ieee80211_recalc_smps(sdata);
1484 }
1485
1486 /*
1487  * Helper function to initialise an interface to a specific type.
1488  */
1489 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1490                                   enum nl80211_iftype type)
1491 {
1492         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1493                                                     0xff, 0xff, 0xff};
1494
1495         /* clear type-dependent union */
1496         memset(&sdata->u, 0, sizeof(sdata->u));
1497
1498         /* and set some type-dependent values */
1499         sdata->vif.type = type;
1500         sdata->vif.p2p = false;
1501         sdata->wdev.iftype = type;
1502
1503         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1504         sdata->control_port_no_encrypt = false;
1505         sdata->control_port_over_nl80211 = false;
1506         sdata->control_port_no_preauth = false;
1507         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1508         sdata->vif.bss_conf.idle = true;
1509         sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1510
1511         sdata->noack_map = 0;
1512
1513         /* only monitor/p2p-device differ */
1514         if (sdata->dev) {
1515                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1516                 sdata->dev->type = ARPHRD_ETHER;
1517         }
1518
1519         skb_queue_head_init(&sdata->skb_queue);
1520         INIT_WORK(&sdata->work, ieee80211_iface_work);
1521         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1522         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1523         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1524         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1525
1526         switch (type) {
1527         case NL80211_IFTYPE_P2P_GO:
1528                 type = NL80211_IFTYPE_AP;
1529                 sdata->vif.type = type;
1530                 sdata->vif.p2p = true;
1531                 fallthrough;
1532         case NL80211_IFTYPE_AP:
1533                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1534                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1535                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1536                 break;
1537         case NL80211_IFTYPE_P2P_CLIENT:
1538                 type = NL80211_IFTYPE_STATION;
1539                 sdata->vif.type = type;
1540                 sdata->vif.p2p = true;
1541                 fallthrough;
1542         case NL80211_IFTYPE_STATION:
1543                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1544                 ieee80211_sta_setup_sdata(sdata);
1545                 break;
1546         case NL80211_IFTYPE_OCB:
1547                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1548                 ieee80211_ocb_setup_sdata(sdata);
1549                 break;
1550         case NL80211_IFTYPE_ADHOC:
1551                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1552                 ieee80211_ibss_setup_sdata(sdata);
1553                 break;
1554         case NL80211_IFTYPE_MESH_POINT:
1555                 if (ieee80211_vif_is_mesh(&sdata->vif))
1556                         ieee80211_mesh_init_sdata(sdata);
1557                 break;
1558         case NL80211_IFTYPE_MONITOR:
1559                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1560                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1561                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1562                                       MONITOR_FLAG_OTHER_BSS;
1563                 break;
1564         case NL80211_IFTYPE_NAN:
1565                 idr_init(&sdata->u.nan.function_inst_ids);
1566                 spin_lock_init(&sdata->u.nan.func_lock);
1567                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1568                 break;
1569         case NL80211_IFTYPE_AP_VLAN:
1570         case NL80211_IFTYPE_P2P_DEVICE:
1571                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1572                 break;
1573         case NL80211_IFTYPE_UNSPECIFIED:
1574         case NL80211_IFTYPE_WDS:
1575         case NUM_NL80211_IFTYPES:
1576                 WARN_ON(1);
1577                 break;
1578         }
1579
1580         ieee80211_debugfs_add_netdev(sdata);
1581 }
1582
1583 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1584                                            enum nl80211_iftype type)
1585 {
1586         struct ieee80211_local *local = sdata->local;
1587         int ret, err;
1588         enum nl80211_iftype internal_type = type;
1589         bool p2p = false;
1590
1591         ASSERT_RTNL();
1592
1593         if (!local->ops->change_interface)
1594                 return -EBUSY;
1595
1596         switch (sdata->vif.type) {
1597         case NL80211_IFTYPE_AP:
1598         case NL80211_IFTYPE_STATION:
1599         case NL80211_IFTYPE_ADHOC:
1600         case NL80211_IFTYPE_OCB:
1601                 /*
1602                  * Could maybe also all others here?
1603                  * Just not sure how that interacts
1604                  * with the RX/config path e.g. for
1605                  * mesh.
1606                  */
1607                 break;
1608         default:
1609                 return -EBUSY;
1610         }
1611
1612         switch (type) {
1613         case NL80211_IFTYPE_AP:
1614         case NL80211_IFTYPE_STATION:
1615         case NL80211_IFTYPE_ADHOC:
1616         case NL80211_IFTYPE_OCB:
1617                 /*
1618                  * Could probably support everything
1619                  * but here.
1620                  */
1621                 break;
1622         case NL80211_IFTYPE_P2P_CLIENT:
1623                 p2p = true;
1624                 internal_type = NL80211_IFTYPE_STATION;
1625                 break;
1626         case NL80211_IFTYPE_P2P_GO:
1627                 p2p = true;
1628                 internal_type = NL80211_IFTYPE_AP;
1629                 break;
1630         default:
1631                 return -EBUSY;
1632         }
1633
1634         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1635         if (ret)
1636                 return ret;
1637
1638         ieee80211_stop_vif_queues(local, sdata,
1639                                   IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1640         synchronize_net();
1641
1642         ieee80211_do_stop(sdata, false);
1643
1644         ieee80211_teardown_sdata(sdata);
1645
1646         ieee80211_set_sdata_offload_flags(sdata);
1647         ret = drv_change_interface(local, sdata, internal_type, p2p);
1648         if (ret)
1649                 type = ieee80211_vif_type_p2p(&sdata->vif);
1650
1651         /*
1652          * Ignore return value here, there's not much we can do since
1653          * the driver changed the interface type internally already.
1654          * The warnings will hopefully make driver authors fix it :-)
1655          */
1656         ieee80211_check_queues(sdata, type);
1657
1658         ieee80211_setup_sdata(sdata, type);
1659         ieee80211_set_vif_encap_ops(sdata);
1660
1661         err = ieee80211_do_open(&sdata->wdev, false);
1662         WARN(err, "type change: do_open returned %d", err);
1663
1664         ieee80211_wake_vif_queues(local, sdata,
1665                                   IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1666         return ret;
1667 }
1668
1669 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1670                              enum nl80211_iftype type)
1671 {
1672         int ret;
1673
1674         ASSERT_RTNL();
1675
1676         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1677                 return 0;
1678
1679         if (ieee80211_sdata_running(sdata)) {
1680                 ret = ieee80211_runtime_change_iftype(sdata, type);
1681                 if (ret)
1682                         return ret;
1683         } else {
1684                 /* Purge and reset type-dependent state. */
1685                 ieee80211_teardown_sdata(sdata);
1686                 ieee80211_setup_sdata(sdata, type);
1687         }
1688
1689         /* reset some values that shouldn't be kept across type changes */
1690         if (type == NL80211_IFTYPE_STATION)
1691                 sdata->u.mgd.use_4addr = false;
1692
1693         return 0;
1694 }
1695
1696 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1697                                        u8 *perm_addr, enum nl80211_iftype type)
1698 {
1699         struct ieee80211_sub_if_data *sdata;
1700         u64 mask, start, addr, val, inc;
1701         u8 *m;
1702         u8 tmp_addr[ETH_ALEN];
1703         int i;
1704
1705         /* default ... something at least */
1706         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1707
1708         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1709             local->hw.wiphy->n_addresses <= 1)
1710                 return;
1711
1712         mutex_lock(&local->iflist_mtx);
1713
1714         switch (type) {
1715         case NL80211_IFTYPE_MONITOR:
1716                 /* doesn't matter */
1717                 break;
1718         case NL80211_IFTYPE_AP_VLAN:
1719                 /* match up with an AP interface */
1720                 list_for_each_entry(sdata, &local->interfaces, list) {
1721                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1722                                 continue;
1723                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1724                         break;
1725                 }
1726                 /* keep default if no AP interface present */
1727                 break;
1728         case NL80211_IFTYPE_P2P_CLIENT:
1729         case NL80211_IFTYPE_P2P_GO:
1730                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1731                         list_for_each_entry(sdata, &local->interfaces, list) {
1732                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1733                                         continue;
1734                                 if (!ieee80211_sdata_running(sdata))
1735                                         continue;
1736                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1737                                 goto out_unlock;
1738                         }
1739                 }
1740                 fallthrough;
1741         default:
1742                 /* assign a new address if possible -- try n_addresses first */
1743                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1744                         bool used = false;
1745
1746                         list_for_each_entry(sdata, &local->interfaces, list) {
1747                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1748                                                      sdata->vif.addr)) {
1749                                         used = true;
1750                                         break;
1751                                 }
1752                         }
1753
1754                         if (!used) {
1755                                 memcpy(perm_addr,
1756                                        local->hw.wiphy->addresses[i].addr,
1757                                        ETH_ALEN);
1758                                 break;
1759                         }
1760                 }
1761
1762                 /* try mask if available */
1763                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1764                         break;
1765
1766                 m = local->hw.wiphy->addr_mask;
1767                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1768                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1769                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1770
1771                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1772                         /* not a contiguous mask ... not handled now! */
1773                         pr_info("not contiguous\n");
1774                         break;
1775                 }
1776
1777                 /*
1778                  * Pick address of existing interface in case user changed
1779                  * MAC address manually, default to perm_addr.
1780                  */
1781                 m = local->hw.wiphy->perm_addr;
1782                 list_for_each_entry(sdata, &local->interfaces, list) {
1783                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1784                                 continue;
1785                         m = sdata->vif.addr;
1786                         break;
1787                 }
1788                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1789                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1790                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1791
1792                 inc = 1ULL<<__ffs64(mask);
1793                 val = (start & mask);
1794                 addr = (start & ~mask) | (val & mask);
1795                 do {
1796                         bool used = false;
1797
1798                         tmp_addr[5] = addr >> 0*8;
1799                         tmp_addr[4] = addr >> 1*8;
1800                         tmp_addr[3] = addr >> 2*8;
1801                         tmp_addr[2] = addr >> 3*8;
1802                         tmp_addr[1] = addr >> 4*8;
1803                         tmp_addr[0] = addr >> 5*8;
1804
1805                         val += inc;
1806
1807                         list_for_each_entry(sdata, &local->interfaces, list) {
1808                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1809                                         used = true;
1810                                         break;
1811                                 }
1812                         }
1813
1814                         if (!used) {
1815                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1816                                 break;
1817                         }
1818                         addr = (start & ~mask) | (val & mask);
1819                 } while (addr != start);
1820
1821                 break;
1822         }
1823
1824  out_unlock:
1825         mutex_unlock(&local->iflist_mtx);
1826 }
1827
1828 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1829                      unsigned char name_assign_type,
1830                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1831                      struct vif_params *params)
1832 {
1833         struct net_device *ndev = NULL;
1834         struct ieee80211_sub_if_data *sdata = NULL;
1835         struct txq_info *txqi;
1836         void (*if_setup)(struct net_device *dev);
1837         int ret, i;
1838         int txqs = 1;
1839
1840         ASSERT_RTNL();
1841
1842         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1843                 struct wireless_dev *wdev;
1844
1845                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1846                                 GFP_KERNEL);
1847                 if (!sdata)
1848                         return -ENOMEM;
1849                 wdev = &sdata->wdev;
1850
1851                 sdata->dev = NULL;
1852                 strlcpy(sdata->name, name, IFNAMSIZ);
1853                 ieee80211_assign_perm_addr(local, wdev->address, type);
1854                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1855         } else {
1856                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1857                                  sizeof(void *));
1858                 int txq_size = 0;
1859
1860                 if (local->ops->wake_tx_queue &&
1861                     type != NL80211_IFTYPE_AP_VLAN &&
1862                     (type != NL80211_IFTYPE_MONITOR ||
1863                      (params->flags & MONITOR_FLAG_ACTIVE)))
1864                         txq_size += sizeof(struct txq_info) +
1865                                     local->hw.txq_data_size;
1866
1867                 if (local->ops->wake_tx_queue) {
1868                         if_setup = ieee80211_if_setup_no_queue;
1869                 } else {
1870                         if_setup = ieee80211_if_setup;
1871                         if (local->hw.queues >= IEEE80211_NUM_ACS)
1872                                 txqs = IEEE80211_NUM_ACS;
1873                 }
1874
1875                 ndev = alloc_netdev_mqs(size + txq_size,
1876                                         name, name_assign_type,
1877                                         if_setup, txqs, 1);
1878                 if (!ndev)
1879                         return -ENOMEM;
1880
1881                 if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len)
1882                         ndev->tx_queue_len = local->hw.wiphy->tx_queue_len;
1883
1884                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1885
1886                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1887                 if (!ndev->tstats) {
1888                         free_netdev(ndev);
1889                         return -ENOMEM;
1890                 }
1891
1892                 ndev->needed_headroom = local->tx_headroom +
1893                                         4*6 /* four MAC addresses */
1894                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1895                                         + 6 /* mesh */
1896                                         + 8 /* rfc1042/bridge tunnel */
1897                                         - ETH_HLEN /* ethernet hard_header_len */
1898                                         + IEEE80211_ENCRYPT_HEADROOM;
1899                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1900
1901                 ret = dev_alloc_name(ndev, ndev->name);
1902                 if (ret < 0) {
1903                         ieee80211_if_free(ndev);
1904                         free_netdev(ndev);
1905                         return ret;
1906                 }
1907
1908                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1909                 if (is_valid_ether_addr(params->macaddr))
1910                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1911                 else
1912                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1913                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1914
1915                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1916                 sdata = netdev_priv(ndev);
1917                 ndev->ieee80211_ptr = &sdata->wdev;
1918                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1919                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1920
1921                 if (txq_size) {
1922                         txqi = netdev_priv(ndev) + size;
1923                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1924                 }
1925
1926                 sdata->dev = ndev;
1927         }
1928
1929         /* initialise type-independent data */
1930         sdata->wdev.wiphy = local->hw.wiphy;
1931         sdata->local = local;
1932
1933         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1934                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1935
1936         INIT_LIST_HEAD(&sdata->key_list);
1937
1938         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1939                           ieee80211_dfs_cac_timer_work);
1940         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1941                           ieee80211_delayed_tailroom_dec);
1942
1943         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1944                 struct ieee80211_supported_band *sband;
1945                 sband = local->hw.wiphy->bands[i];
1946                 sdata->rc_rateidx_mask[i] =
1947                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1948                 if (sband) {
1949                         __le16 cap;
1950                         u16 *vht_rate_mask;
1951
1952                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1953                                sband->ht_cap.mcs.rx_mask,
1954                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1955
1956                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1957                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1958                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1959                 } else {
1960                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1961                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1962                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1963                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1964                 }
1965         }
1966
1967         ieee80211_set_default_queues(sdata);
1968
1969         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1970         sdata->user_power_level = local->user_power_level;
1971
1972         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1973
1974         /* setup type-dependent data */
1975         ieee80211_setup_sdata(sdata, type);
1976
1977         if (ndev) {
1978                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1979                 if (type == NL80211_IFTYPE_STATION)
1980                         sdata->u.mgd.use_4addr = params->use_4addr;
1981
1982                 ndev->features |= local->hw.netdev_features;
1983                 ndev->hw_features |= ndev->features &
1984                                         MAC80211_SUPPORTED_FEATURES_TX;
1985
1986                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1987
1988                 /* MTU range: 256 - 2304 */
1989                 ndev->min_mtu = 256;
1990                 ndev->max_mtu = local->hw.max_mtu;
1991
1992                 ret = cfg80211_register_netdevice(ndev);
1993                 if (ret) {
1994                         free_netdev(ndev);
1995                         return ret;
1996                 }
1997         }
1998
1999         mutex_lock(&local->iflist_mtx);
2000         list_add_tail_rcu(&sdata->list, &local->interfaces);
2001         mutex_unlock(&local->iflist_mtx);
2002
2003         if (new_wdev)
2004                 *new_wdev = &sdata->wdev;
2005
2006         return 0;
2007 }
2008
2009 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2010 {
2011         ASSERT_RTNL();
2012
2013         mutex_lock(&sdata->local->iflist_mtx);
2014         list_del_rcu(&sdata->list);
2015         mutex_unlock(&sdata->local->iflist_mtx);
2016
2017         if (sdata->vif.txq)
2018                 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2019
2020         synchronize_rcu();
2021
2022         cfg80211_unregister_wdev(&sdata->wdev);
2023
2024         if (!sdata->dev) {
2025                 ieee80211_teardown_sdata(sdata);
2026                 kfree(sdata);
2027         }
2028 }
2029
2030 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2031 {
2032         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2033                 return;
2034         ieee80211_do_stop(sdata, true);
2035 }
2036
2037 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2038 {
2039         struct ieee80211_sub_if_data *sdata, *tmp;
2040         LIST_HEAD(unreg_list);
2041         LIST_HEAD(wdev_list);
2042
2043         ASSERT_RTNL();
2044
2045         /* Before destroying the interfaces, make sure they're all stopped so
2046          * that the hardware is stopped. Otherwise, the driver might still be
2047          * iterating the interfaces during the shutdown, e.g. from a worker
2048          * or from RX processing or similar, and if it does so (using atomic
2049          * iteration) while we're manipulating the list, the iteration will
2050          * crash.
2051          *
2052          * After this, the hardware should be stopped and the driver should
2053          * have stopped all of its activities, so that we can do RCU-unaware
2054          * manipulations of the interface list below.
2055          */
2056         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2057
2058         WARN(local->open_count, "%s: open count remains %d\n",
2059              wiphy_name(local->hw.wiphy), local->open_count);
2060
2061         ieee80211_txq_teardown_flows(local);
2062
2063         mutex_lock(&local->iflist_mtx);
2064         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
2065                 list_del(&sdata->list);
2066
2067                 if (sdata->dev)
2068                         unregister_netdevice_queue(sdata->dev, &unreg_list);
2069                 else
2070                         list_add(&sdata->list, &wdev_list);
2071         }
2072         mutex_unlock(&local->iflist_mtx);
2073
2074         unregister_netdevice_many(&unreg_list);
2075
2076         wiphy_lock(local->hw.wiphy);
2077         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2078                 list_del(&sdata->list);
2079                 cfg80211_unregister_wdev(&sdata->wdev);
2080                 kfree(sdata);
2081         }
2082         wiphy_unlock(local->hw.wiphy);
2083 }
2084
2085 static int netdev_notify(struct notifier_block *nb,
2086                          unsigned long state, void *ptr)
2087 {
2088         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2089         struct ieee80211_sub_if_data *sdata;
2090
2091         if (state != NETDEV_CHANGENAME)
2092                 return NOTIFY_DONE;
2093
2094         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2095                 return NOTIFY_DONE;
2096
2097         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2098                 return NOTIFY_DONE;
2099
2100         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2101         memcpy(sdata->name, dev->name, IFNAMSIZ);
2102         ieee80211_debugfs_rename_netdev(sdata);
2103
2104         return NOTIFY_OK;
2105 }
2106
2107 static struct notifier_block mac80211_netdev_notifier = {
2108         .notifier_call = netdev_notify,
2109 };
2110
2111 int ieee80211_iface_init(void)
2112 {
2113         return register_netdevice_notifier(&mac80211_netdev_notifier);
2114 }
2115
2116 void ieee80211_iface_exit(void)
2117 {
2118         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2119 }
2120
2121 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2122 {
2123         if (sdata->vif.type == NL80211_IFTYPE_AP)
2124                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2125         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2126                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2127 }
2128
2129 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2130 {
2131         if (sdata->vif.type == NL80211_IFTYPE_AP)
2132                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2133         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2134                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2135 }