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_WDS) ||
 234                 (type1 == NL80211_IFTYPE_WDS &&
 235                         (type2 == NL80211_IFTYPE_WDS ||
 236                          type2 == NL80211_IFTYPE_AP)) ||
 237                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 238                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 239                         (type2 == NL80211_IFTYPE_AP ||
 240                          type2 == NL80211_IFTYPE_AP_VLAN));
 241 }
 242
 243 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 244                                             enum nl80211_iftype iftype)
 245 {
 246         struct ieee80211_local *local = sdata->local;
 247         struct ieee80211_sub_if_data *nsdata;
 248         int ret;
 249
 250         ASSERT_RTNL();
 251
 252         /* we hold the RTNL here so can safely walk the list */
 253         list_for_each_entry(nsdata, &local->interfaces, list) {
 254                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 255                         /*
 256                          * Only OCB and monitor mode may coexist
 257                          */
 258                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
 259                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
 260                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 261                              nsdata->vif.type == NL80211_IFTYPE_OCB))
 262                                 return -EBUSY;
 263
 264                         /*
 265                          * Allow only a single IBSS interface to be up at any
 266                          * time. This is restricted because beacon distribution
 267                          * cannot work properly if both are in the same IBSS.
 268                          *
 269                          * To remove this restriction we'd have to disallow them
 270                          * from setting the same SSID on different IBSS interfaces
 271                          * belonging to the same hardware. Then, however, we're
 272                          * faced with having to adopt two different TSF timers...
 273                          */
 274                         if (iftype == NL80211_IFTYPE_ADHOC &&
 275                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 276                                 return -EBUSY;
 277                         /*
 278                          * will not add another interface while any channel
 279                          * switch is active.
 280                          */
 281                         if (nsdata->vif.csa_active)
 282                                 return -EBUSY;
 283
 284                         /*
 285                          * The remaining checks are only performed for interfaces
 286                          * with the same MAC address.
 287                          */
 288                         if (!ether_addr_equal(sdata->vif.addr,
 289                                               nsdata->vif.addr))
 290                                 continue;
 291
 292                         /*
 293                          * check whether it may have the same address
 294                          */
 295                         if (!identical_mac_addr_allowed(iftype,
 296                                                         nsdata->vif.type))
 297                                 return -ENOTUNIQ;
 298
 299                         /*
 300                          * can only add VLANs to enabled APs
 301                          */
 302                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 303                             nsdata->vif.type == NL80211_IFTYPE_AP)
 304                                 sdata->bss = &nsdata->u.ap;
 305                 }
 306         }
 307
 308         mutex_lock(&local->chanctx_mtx);
 309         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
 310         mutex_unlock(&local->chanctx_mtx);
 311         return ret;
 312 }
 313
 314 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 315                                   enum nl80211_iftype iftype)
 316 {
 317         int n_queues = sdata->local->hw.queues;
 318         int i;
 319
 320         if (iftype == NL80211_IFTYPE_NAN)
 321                 return 0;
 322
 323         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 324                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 325                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 326                                          IEEE80211_INVAL_HW_QUEUE))
 327                                 return -EINVAL;
 328                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 329                                          n_queues))
 330                                 return -EINVAL;
 331                 }
 332         }
 333
 334         if ((iftype != NL80211_IFTYPE_AP &&
 335              iftype != NL80211_IFTYPE_P2P_GO &&
 336              iftype != NL80211_IFTYPE_MESH_POINT) ||
 337             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
 338                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 339                 return 0;
 340         }
 341
 342         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 343                 return -EINVAL;
 344
 345         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 346                 return -EINVAL;
 347
 348         return 0;
 349 }
 350
 351 static int ieee80211_open(struct net_device *dev)
 352 {
 353         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 354         int err;
 355
 356         /* fail early if user set an invalid address */
 357         if (!is_valid_ether_addr(dev->dev_addr))
 358                 return -EADDRNOTAVAIL;
 359
 360         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 361         if (err)
 362                 return err;
 363
 364         return ieee80211_do_open(&sdata->wdev, true);
 365 }
 366
 367 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata,
 368                               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          * In WDS mode a station must exist here and be flushed, for
 421          * AP_VLANs stations may exist since there's nothing else that
 422          * would have removed them, but in other modes there shouldn't
 423          * be any stations.
 424          */
 425         flushed = sta_info_flush(sdata);
 426         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN &&
 427                      ((sdata->vif.type != NL80211_IFTYPE_WDS && flushed > 0) ||
 428                       (sdata->vif.type == NL80211_IFTYPE_WDS && flushed != 1)));
 429
 430         /* don't count this interface for allmulti while it is down */
 431         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 432                 atomic_dec(&local->iff_allmultis);
 433
 434         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 435                 local->fif_pspoll--;
 436                 local->fif_probe_req--;
 437         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 438                 local->fif_probe_req--;
 439         }
 440
 441         if (sdata->dev) {
 442                 netif_addr_lock_bh(sdata->dev);
 443                 spin_lock_bh(&local->filter_lock);
 444                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 445                                  sdata->dev->addr_len);
 446                 spin_unlock_bh(&local->filter_lock);
 447                 netif_addr_unlock_bh(sdata->dev);
 448         }
 449
 450         del_timer_sync(&local->dynamic_ps_timer);
 451         cancel_work_sync(&local->dynamic_ps_enable_work);
 452
 453         cancel_work_sync(&sdata->recalc_smps);
 454         sdata_lock(sdata);
 455         mutex_lock(&local->mtx);
 456         sdata->vif.csa_active = false;
 457         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 458                 sdata->u.mgd.csa_waiting_bcn = false;
 459         if (sdata->csa_block_tx) {
 460                 ieee80211_wake_vif_queues(local, sdata,
 461                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 462                 sdata->csa_block_tx = false;
 463         }
 464         mutex_unlock(&local->mtx);
 465         sdata_unlock(sdata);
 466
 467         cancel_work_sync(&sdata->csa_finalize_work);
 468
 469         cancel_delayed_work_sync(&sdata->dfs_cac_timer_work);
 470
 471         if (sdata->wdev.cac_started) {
 472                 chandef = sdata->vif.bss_conf.chandef;
 473                 WARN_ON(local->suspended);
 474                 mutex_lock(&local->mtx);
 475                 ieee80211_vif_release_channel(sdata);
 476                 mutex_unlock(&local->mtx);
 477                 cfg80211_cac_event(sdata->dev, &chandef,
 478                                    NL80211_RADAR_CAC_ABORTED,
 479                                    GFP_KERNEL);
 480         }
 481
 482         /* APs need special treatment */
 483         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 484                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 485
 486                 /* down all dependent devices, that is VLANs */
 487                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 488                                          u.vlan.list)
 489                         dev_close(vlan->dev);
 490                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 491         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 492                 /* remove all packets in parent bc_buf pointing to this dev */
 493                 ps = &sdata->bss->ps;
 494
 495                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 496                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 497                         if (skb->dev == sdata->dev) {
 498                                 __skb_unlink(skb, &ps->bc_buf);
 499                                 local->total_ps_buffered--;
 500                                 ieee80211_free_txskb(&local->hw, skb);
 501                         }
 502                 }
 503                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 504         }
 505
 506         if (going_down)
 507                 local->open_count--;
 508
 509         switch (sdata->vif.type) {
 510         case NL80211_IFTYPE_AP_VLAN:
 511                 mutex_lock(&local->mtx);
 512                 list_del(&sdata->u.vlan.list);
 513                 mutex_unlock(&local->mtx);
 514                 RCU_INIT_POINTER(sdata->vif.chanctx_conf, NULL);
 515                 /* see comment in the default case below */
 516                 ieee80211_free_keys(sdata, true);
 517                 /* no need to tell driver */
 518                 break;
 519         case NL80211_IFTYPE_MONITOR:
 520                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 521                         local->cooked_mntrs--;
 522                         break;
 523                 }
 524
 525                 local->monitors--;
 526                 if (local->monitors == 0) {
 527                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 528                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 529                 }
 530
 531                 ieee80211_adjust_monitor_flags(sdata, -1);
 532                 break;
 533         case NL80211_IFTYPE_NAN:
 534                 /* clean all the functions */
 535                 spin_lock_bh(&sdata->u.nan.func_lock);
 536
 537                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
 538                         idr_remove(&sdata->u.nan.function_inst_ids, i);
 539                         cfg80211_free_nan_func(func);
 540                 }
 541                 idr_destroy(&sdata->u.nan.function_inst_ids);
 542
 543                 spin_unlock_bh(&sdata->u.nan.func_lock);
 544                 break;
 545         case NL80211_IFTYPE_P2P_DEVICE:
 546                 /* relies on synchronize_rcu() below */
 547                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 548                 fallthrough;
 549         default:
 550                 cancel_work_sync(&sdata->work);
 551                 /*
 552                  * When we get here, the interface is marked down.
 553                  * Free the remaining keys, if there are any
 554                  * (which can happen in AP mode if userspace sets
 555                  * keys before the interface is operating, and maybe
 556                  * also in WDS mode)
 557                  *
 558                  * Force the key freeing to always synchronize_net()
 559                  * to wait for the RX path in case it is using this
 560                  * interface enqueuing frames at this very time on
 561                  * another CPU.
 562                  */
 563                 ieee80211_free_keys(sdata, true);
 564                 skb_queue_purge(&sdata->skb_queue);
 565         }
 566
 567         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 568         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 569                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 570                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 571                         if (info->control.vif == &sdata->vif) {
 572                                 __skb_unlink(skb, &local->pending[i]);
 573                                 ieee80211_free_txskb(&local->hw, skb);
 574                         }
 575                 }
 576         }
 577         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 578
 579         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 580                 ieee80211_txq_remove_vlan(local, sdata);
 581
 582         sdata->bss = NULL;
 583
 584         if (local->open_count == 0)
 585                 ieee80211_clear_tx_pending(local);
 586
 587         sdata->vif.bss_conf.beacon_int = 0;
 588
 589         /*
 590          * If the interface goes down while suspended, presumably because
 591          * the device was unplugged and that happens before our resume,
 592          * then the driver is already unconfigured and the remainder of
 593          * this function isn't needed.
 594          * XXX: what about WoWLAN? If the device has software state, e.g.
 595          *      memory allocated, it might expect teardown commands from
 596          *      mac80211 here?
 597          */
 598         if (local->suspended) {
 599                 WARN_ON(local->wowlan);
 600                 WARN_ON(rtnl_dereference(local->monitor_sdata));
 601                 return;
 602         }
 603
 604         switch (sdata->vif.type) {
 605         case NL80211_IFTYPE_AP_VLAN:
 606                 break;
 607         case NL80211_IFTYPE_MONITOR:
 608                 if (local->monitors == 0)
 609                         ieee80211_del_virtual_monitor(local);
 610
 611                 mutex_lock(&local->mtx);
 612                 ieee80211_recalc_idle(local);
 613                 mutex_unlock(&local->mtx);
 614
 615                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 616                         break;
 617
 618                 fallthrough;
 619         default:
 620                 if (going_down)
 621                         drv_remove_interface(local, sdata);
 622         }
 623
 624         ieee80211_recalc_ps(local);
 625
 626         if (cancel_scan)
 627                 flush_delayed_work(&local->scan_work);
 628
 629         if (local->open_count == 0) {
 630                 ieee80211_stop_device(local);
 631
 632                 /* no reconfiguring after stop! */
 633                 return;
 634         }
 635
 636         /* do after stop to avoid reconfiguring when we stop anyway */
 637         ieee80211_configure_filter(local);
 638         ieee80211_hw_config(local, hw_reconf_flags);
 639
 640         if (local->monitors == local->open_count)
 641                 ieee80211_add_virtual_monitor(local);
 642 }
 643
 644 static int ieee80211_stop(struct net_device *dev)
 645 {
 646         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 647
 648         ieee80211_do_stop(sdata, true);
 649
 650         return 0;
 651 }
 652
 653 static void ieee80211_set_multicast_list(struct net_device *dev)
 654 {
 655         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 656         struct ieee80211_local *local = sdata->local;
 657         int allmulti, sdata_allmulti;
 658
 659         allmulti = !!(dev->flags & IFF_ALLMULTI);
 660         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 661
 662         if (allmulti != sdata_allmulti) {
 663                 if (dev->flags & IFF_ALLMULTI)
 664                         atomic_inc(&local->iff_allmultis);
 665                 else
 666                         atomic_dec(&local->iff_allmultis);
 667                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 668         }
 669
 670         spin_lock_bh(&local->filter_lock);
 671         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 672         spin_unlock_bh(&local->filter_lock);
 673         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 674 }
 675
 676 /*
 677  * Called when the netdev is removed or, by the code below, before
 678  * the interface type changes.
 679  */
 680 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 681 {
 682         int i;
 683
 684         /* free extra data */
 685         ieee80211_free_keys(sdata, false);
 686
 687         ieee80211_debugfs_remove_netdev(sdata);
 688
 689         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
 690                 __skb_queue_purge(&sdata->fragments[i].skb_list);
 691         sdata->fragment_next = 0;
 692
 693         if (ieee80211_vif_is_mesh(&sdata->vif))
 694                 ieee80211_mesh_teardown_sdata(sdata);
 695 }
 696
 697 static void ieee80211_uninit(struct net_device *dev)
 698 {
 699         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
 700 }
 701
 702 static u16 ieee80211_netdev_select_queue(struct net_device *dev,
 703                                          struct sk_buff *skb,
 704                                          struct net_device *sb_dev)
 705 {
 706         return ieee80211_select_queue(IEEE80211_DEV_TO_SUB_IF(dev), skb);
 707 }
 708
 709 static void
 710 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 711 {
 712         dev_fetch_sw_netstats(stats, dev->tstats);
 713 }
 714
 715 static const struct net_device_ops ieee80211_dataif_ops = {
 716         .ndo_open               = ieee80211_open,
 717         .ndo_stop               = ieee80211_stop,
 718         .ndo_uninit             = ieee80211_uninit,
 719         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 720         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 721         .ndo_set_mac_address    = ieee80211_change_mac,
 722         .ndo_select_queue       = ieee80211_netdev_select_queue,
 723         .ndo_get_stats64        = ieee80211_get_stats64,
 724 };
 725
 726 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 727                                           struct sk_buff *skb,
 728                                           struct net_device *sb_dev)
 729 {
 730         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 731         struct ieee80211_local *local = sdata->local;
 732         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 733         struct ieee80211_hdr *hdr;
 734         int len_rthdr;
 735
 736         if (local->hw.queues < IEEE80211_NUM_ACS)
 737                 return 0;
 738
 739         /* reset flags and info before parsing radiotap header */
 740         memset(info, 0, sizeof(*info));
 741
 742         if (!ieee80211_parse_tx_radiotap(skb, dev))
 743                 return 0; /* doesn't matter, frame will be dropped */
 744
 745         len_rthdr = ieee80211_get_radiotap_len(skb->data);
 746         hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
 747         if (skb->len < len_rthdr + 2 ||
 748             skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
 749                 return 0; /* doesn't matter, frame will be dropped */
 750
 751         return ieee80211_select_queue_80211(sdata, skb, hdr);
 752 }
 753
 754 static const struct net_device_ops ieee80211_monitorif_ops = {
 755         .ndo_open               = ieee80211_open,
 756         .ndo_stop               = ieee80211_stop,
 757         .ndo_uninit             = ieee80211_uninit,
 758         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 759         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 760         .ndo_set_mac_address    = ieee80211_change_mac,
 761         .ndo_select_queue       = ieee80211_monitor_select_queue,
 762         .ndo_get_stats64        = ieee80211_get_stats64,
 763 };
 764
 765 static const struct net_device_ops ieee80211_dataif_8023_ops = {
 766         .ndo_open               = ieee80211_open,
 767         .ndo_stop               = ieee80211_stop,
 768         .ndo_uninit             = ieee80211_uninit,
 769         .ndo_start_xmit         = ieee80211_subif_start_xmit_8023,
 770         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 771         .ndo_set_mac_address    = ieee80211_change_mac,
 772         .ndo_select_queue       = ieee80211_netdev_select_queue,
 773         .ndo_get_stats64        = ieee80211_get_stats64,
 774 };
 775
 776 static bool ieee80211_iftype_supports_encap_offload(enum nl80211_iftype iftype)
 777 {
 778         switch (iftype) {
 779         /* P2P GO and client are mapped to AP/STATION types */
 780         case NL80211_IFTYPE_AP:
 781         case NL80211_IFTYPE_STATION:
 782                 return true;
 783         default:
 784                 return false;
 785         }
 786 }
 787
 788 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
 789 {
 790         struct ieee80211_local *local = sdata->local;
 791         u32 flags;
 792
 793         flags = sdata->vif.offload_flags;
 794
 795         if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
 796             ieee80211_iftype_supports_encap_offload(sdata->vif.type)) {
 797                 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
 798
 799                 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
 800                     local->hw.wiphy->frag_threshold != (u32)-1)
 801                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 802
 803                 if (local->monitors)
 804                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 805         } else {
 806                 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 807         }
 808
 809         if (sdata->vif.offload_flags == flags)
 810                 return false;
 811
 812         sdata->vif.offload_flags = flags;
 813         return true;
 814 }
 815
 816 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
 817 {
 818         struct ieee80211_local *local = sdata->local;
 819         struct ieee80211_sub_if_data *bss = sdata;
 820         bool enabled;
 821
 822         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 823                 if (!sdata->bss)
 824                         return;
 825
 826                 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
 827         }
 828
 829         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
 830             !ieee80211_iftype_supports_encap_offload(bss->vif.type))
 831                 return;
 832
 833         enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
 834         if (sdata->wdev.use_4addr &&
 835             !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
 836                 enabled = false;
 837
 838         sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
 839                                            &ieee80211_dataif_ops;
 840 }
 841
 842 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
 843 {
 844         struct ieee80211_local *local = sdata->local;
 845         struct ieee80211_sub_if_data *vsdata;
 846
 847         if (ieee80211_set_sdata_offload_flags(sdata)) {
 848                 drv_update_vif_offload(local, sdata);
 849                 ieee80211_set_vif_encap_ops(sdata);
 850         }
 851
 852         list_for_each_entry(vsdata, &local->interfaces, list) {
 853                 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
 854                     vsdata->bss != &sdata->u.ap)
 855                         continue;
 856
 857                 ieee80211_set_vif_encap_ops(vsdata);
 858         }
 859 }
 860
 861 void ieee80211_recalc_offload(struct ieee80211_local *local)
 862 {
 863         struct ieee80211_sub_if_data *sdata;
 864
 865         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
 866                 return;
 867
 868         mutex_lock(&local->iflist_mtx);
 869
 870         list_for_each_entry(sdata, &local->interfaces, list) {
 871                 if (!ieee80211_sdata_running(sdata))
 872                         continue;
 873
 874                 ieee80211_recalc_sdata_offload(sdata);
 875         }
 876
 877         mutex_unlock(&local->iflist_mtx);
 878 }
 879
 880 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 881                                     const int offset)
 882 {
 883         struct ieee80211_local *local = sdata->local;
 884         u32 flags = sdata->u.mntr.flags;
 885
 886 #define ADJUST(_f, _s)  do {                                    \
 887         if (flags & MONITOR_FLAG_##_f)                          \
 888                 local->fif_##_s += offset;                      \
 889         } while (0)
 890
 891         ADJUST(FCSFAIL, fcsfail);
 892         ADJUST(PLCPFAIL, plcpfail);
 893         ADJUST(CONTROL, control);
 894         ADJUST(CONTROL, pspoll);
 895         ADJUST(OTHER_BSS, other_bss);
 896
 897 #undef ADJUST
 898 }
 899
 900 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 901 {
 902         struct ieee80211_local *local = sdata->local;
 903         int i;
 904
 905         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 906                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
 907                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 908                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 909                         sdata->vif.hw_queue[i] = i;
 910                 else
 911                         sdata->vif.hw_queue[i] = 0;
 912         }
 913         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 914 }
 915
 916 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 917 {
 918         struct ieee80211_sub_if_data *sdata;
 919         int ret;
 920
 921         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 922                 return 0;
 923
 924         ASSERT_RTNL();
 925
 926         if (local->monitor_sdata)
 927                 return 0;
 928
 929         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 930         if (!sdata)
 931                 return -ENOMEM;
 932
 933         /* set up data */
 934         sdata->local = local;
 935         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 936         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 937                  wiphy_name(local->hw.wiphy));
 938         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
 939
 940         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 941
 942         ieee80211_set_default_queues(sdata);
 943
 944         ret = drv_add_interface(local, sdata);
 945         if (WARN_ON(ret)) {
 946                 /* ok .. stupid driver, it asked for this! */
 947                 kfree(sdata);
 948                 return ret;
 949         }
 950
 951         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 952         if (ret) {
 953                 kfree(sdata);
 954                 return ret;
 955         }
 956
 957         mutex_lock(&local->iflist_mtx);
 958         rcu_assign_pointer(local->monitor_sdata, sdata);
 959         mutex_unlock(&local->iflist_mtx);
 960
 961         mutex_lock(&local->mtx);
 962         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 963                                         IEEE80211_CHANCTX_EXCLUSIVE);
 964         mutex_unlock(&local->mtx);
 965         if (ret) {
 966                 mutex_lock(&local->iflist_mtx);
 967                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
 968                 mutex_unlock(&local->iflist_mtx);
 969                 synchronize_net();
 970                 drv_remove_interface(local, sdata);
 971                 kfree(sdata);
 972                 return ret;
 973         }
 974
 975         skb_queue_head_init(&sdata->skb_queue);
 976         INIT_WORK(&sdata->work, ieee80211_iface_work);
 977
 978         return 0;
 979 }
 980
 981 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
 982 {
 983         struct ieee80211_sub_if_data *sdata;
 984
 985         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 986                 return;
 987
 988         ASSERT_RTNL();
 989
 990         mutex_lock(&local->iflist_mtx);
 991
 992         sdata = rcu_dereference_protected(local->monitor_sdata,
 993                                           lockdep_is_held(&local->iflist_mtx));
 994         if (!sdata) {
 995                 mutex_unlock(&local->iflist_mtx);
 996                 return;
 997         }
 998
 999         RCU_INIT_POINTER(local->monitor_sdata, NULL);
1000         mutex_unlock(&local->iflist_mtx);
1001
1002         synchronize_net();
1003
1004         mutex_lock(&local->mtx);
1005         ieee80211_vif_release_channel(sdata);
1006         mutex_unlock(&local->mtx);
1007
1008         drv_remove_interface(local, sdata);
1009
1010         kfree(sdata);
1011 }
1012
1013 /*
1014  * NOTE: Be very careful when changing this function, it must NOT return
1015  * an error on interface type changes that have been pre-checked, so most
1016  * checks should be in ieee80211_check_concurrent_iface.
1017  */
1018 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1019 {
1020         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1021         struct net_device *dev = wdev->netdev;
1022         struct ieee80211_local *local = sdata->local;
1023         struct sta_info *sta;
1024         u32 changed = 0;
1025         int res;
1026         u32 hw_reconf_flags = 0;
1027
1028         switch (sdata->vif.type) {
1029         case NL80211_IFTYPE_WDS:
1030                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
1031                         return -ENOLINK;
1032                 break;
1033         case NL80211_IFTYPE_AP_VLAN: {
1034                 struct ieee80211_sub_if_data *master;
1035
1036                 if (!sdata->bss)
1037                         return -ENOLINK;
1038
1039                 mutex_lock(&local->mtx);
1040                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1041                 mutex_unlock(&local->mtx);
1042
1043                 master = container_of(sdata->bss,
1044                                       struct ieee80211_sub_if_data, u.ap);
1045                 sdata->control_port_protocol =
1046                         master->control_port_protocol;
1047                 sdata->control_port_no_encrypt =
1048                         master->control_port_no_encrypt;
1049                 sdata->control_port_over_nl80211 =
1050                         master->control_port_over_nl80211;
1051                 sdata->control_port_no_preauth =
1052                         master->control_port_no_preauth;
1053                 sdata->vif.cab_queue = master->vif.cab_queue;
1054                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1055                        sizeof(sdata->vif.hw_queue));
1056                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1057
1058                 mutex_lock(&local->key_mtx);
1059                 sdata->crypto_tx_tailroom_needed_cnt +=
1060                         master->crypto_tx_tailroom_needed_cnt;
1061                 mutex_unlock(&local->key_mtx);
1062
1063                 break;
1064                 }
1065         case NL80211_IFTYPE_AP:
1066                 sdata->bss = &sdata->u.ap;
1067                 break;
1068         case NL80211_IFTYPE_MESH_POINT:
1069         case NL80211_IFTYPE_STATION:
1070         case NL80211_IFTYPE_MONITOR:
1071         case NL80211_IFTYPE_ADHOC:
1072         case NL80211_IFTYPE_P2P_DEVICE:
1073         case NL80211_IFTYPE_OCB:
1074         case NL80211_IFTYPE_NAN:
1075                 /* no special treatment */
1076                 break;
1077         case NL80211_IFTYPE_UNSPECIFIED:
1078         case NUM_NL80211_IFTYPES:
1079         case NL80211_IFTYPE_P2P_CLIENT:
1080         case NL80211_IFTYPE_P2P_GO:
1081                 /* cannot happen */
1082                 WARN_ON(1);
1083                 break;
1084         }
1085
1086         if (local->open_count == 0) {
1087                 res = drv_start(local);
1088                 if (res)
1089                         goto err_del_bss;
1090                 /* we're brought up, everything changes */
1091                 hw_reconf_flags = ~0;
1092                 ieee80211_led_radio(local, true);
1093                 ieee80211_mod_tpt_led_trig(local,
1094                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1095         }
1096
1097         /*
1098          * Copy the hopefully now-present MAC address to
1099          * this interface, if it has the special null one.
1100          */
1101         if (dev && is_zero_ether_addr(dev->dev_addr)) {
1102                 memcpy(dev->dev_addr,
1103                        local->hw.wiphy->perm_addr,
1104                        ETH_ALEN);
1105                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1106
1107                 if (!is_valid_ether_addr(dev->dev_addr)) {
1108                         res = -EADDRNOTAVAIL;
1109                         goto err_stop;
1110                 }
1111         }
1112
1113         switch (sdata->vif.type) {
1114         case NL80211_IFTYPE_AP_VLAN:
1115                 /* no need to tell driver, but set carrier and chanctx */
1116                 if (rtnl_dereference(sdata->bss->beacon)) {
1117                         ieee80211_vif_vlan_copy_chanctx(sdata);
1118                         netif_carrier_on(dev);
1119                         ieee80211_set_vif_encap_ops(sdata);
1120                 } else {
1121                         netif_carrier_off(dev);
1122                 }
1123                 break;
1124         case NL80211_IFTYPE_MONITOR:
1125                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1126                         local->cooked_mntrs++;
1127                         break;
1128                 }
1129
1130                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1131                         res = drv_add_interface(local, sdata);
1132                         if (res)
1133                                 goto err_stop;
1134                 } else if (local->monitors == 0 && local->open_count == 0) {
1135                         res = ieee80211_add_virtual_monitor(local);
1136                         if (res)
1137                                 goto err_stop;
1138                 }
1139
1140                 /* must be before the call to ieee80211_configure_filter */
1141                 local->monitors++;
1142                 if (local->monitors == 1) {
1143                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1144                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1145                 }
1146
1147                 ieee80211_adjust_monitor_flags(sdata, 1);
1148                 ieee80211_configure_filter(local);
1149                 ieee80211_recalc_offload(local);
1150                 mutex_lock(&local->mtx);
1151                 ieee80211_recalc_idle(local);
1152                 mutex_unlock(&local->mtx);
1153
1154                 netif_carrier_on(dev);
1155                 break;
1156         default:
1157                 if (coming_up) {
1158                         ieee80211_del_virtual_monitor(local);
1159                         ieee80211_set_sdata_offload_flags(sdata);
1160
1161                         res = drv_add_interface(local, sdata);
1162                         if (res)
1163                                 goto err_stop;
1164
1165                         ieee80211_set_vif_encap_ops(sdata);
1166                         res = ieee80211_check_queues(sdata,
1167                                 ieee80211_vif_type_p2p(&sdata->vif));
1168                         if (res)
1169                                 goto err_del_interface;
1170                 }
1171
1172                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1173                         local->fif_pspoll++;
1174                         local->fif_probe_req++;
1175
1176                         ieee80211_configure_filter(local);
1177                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1178                         local->fif_probe_req++;
1179                 }
1180
1181                 if (sdata->vif.probe_req_reg)
1182                         drv_config_iface_filter(local, sdata,
1183                                                 FIF_PROBE_REQ,
1184                                                 FIF_PROBE_REQ);
1185
1186                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1187                     sdata->vif.type != NL80211_IFTYPE_NAN)
1188                         changed |= ieee80211_reset_erp_info(sdata);
1189                 ieee80211_bss_info_change_notify(sdata, changed);
1190
1191                 switch (sdata->vif.type) {
1192                 case NL80211_IFTYPE_STATION:
1193                 case NL80211_IFTYPE_ADHOC:
1194                 case NL80211_IFTYPE_AP:
1195                 case NL80211_IFTYPE_MESH_POINT:
1196                 case NL80211_IFTYPE_OCB:
1197                         netif_carrier_off(dev);
1198                         break;
1199                 case NL80211_IFTYPE_WDS:
1200                 case NL80211_IFTYPE_P2P_DEVICE:
1201                 case NL80211_IFTYPE_NAN:
1202                         break;
1203                 default:
1204                         /* not reached */
1205                         WARN_ON(1);
1206                 }
1207
1208                 /*
1209                  * Set default queue parameters so drivers don't
1210                  * need to initialise the hardware if the hardware
1211                  * doesn't start up with sane defaults.
1212                  * Enable QoS for anything but station interfaces.
1213                  */
1214                 ieee80211_set_wmm_default(sdata, true,
1215                         sdata->vif.type != NL80211_IFTYPE_STATION);
1216         }
1217
1218         set_bit(SDATA_STATE_RUNNING, &sdata->state);
1219
1220         switch (sdata->vif.type) {
1221         case NL80211_IFTYPE_WDS:
1222                 /* Create STA entry for the WDS peer */
1223                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
1224                                      GFP_KERNEL);
1225                 if (!sta) {
1226                         res = -ENOMEM;
1227                         goto err_del_interface;
1228                 }
1229
1230                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
1231                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
1232                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
1233
1234                 res = sta_info_insert(sta);
1235                 if (res) {
1236                         /* STA has been freed */
1237                         goto err_del_interface;
1238                 }
1239
1240                 rate_control_rate_init(sta);
1241                 netif_carrier_on(dev);
1242                 break;
1243         case NL80211_IFTYPE_P2P_DEVICE:
1244                 rcu_assign_pointer(local->p2p_sdata, sdata);
1245                 break;
1246         case NL80211_IFTYPE_MONITOR:
1247                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1248                         break;
1249                 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1250                 break;
1251         default:
1252                 break;
1253         }
1254
1255         /*
1256          * set_multicast_list will be invoked by the networking core
1257          * which will check whether any increments here were done in
1258          * error and sync them down to the hardware as filter flags.
1259          */
1260         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1261                 atomic_inc(&local->iff_allmultis);
1262
1263         if (coming_up)
1264                 local->open_count++;
1265
1266         if (hw_reconf_flags)
1267                 ieee80211_hw_config(local, hw_reconf_flags);
1268
1269         ieee80211_recalc_ps(local);
1270
1271         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1272             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1273             local->ops->wake_tx_queue) {
1274                 /* XXX: for AP_VLAN, actually track AP queues */
1275                 if (dev)
1276                         netif_tx_start_all_queues(dev);
1277         } else if (dev) {
1278                 unsigned long flags;
1279                 int n_acs = IEEE80211_NUM_ACS;
1280                 int ac;
1281
1282                 if (local->hw.queues < IEEE80211_NUM_ACS)
1283                         n_acs = 1;
1284
1285                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1286                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
1287                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
1288                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
1289                         for (ac = 0; ac < n_acs; ac++) {
1290                                 int ac_queue = sdata->vif.hw_queue[ac];
1291
1292                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
1293                                     skb_queue_empty(&local->pending[ac_queue]))
1294                                         netif_start_subqueue(dev, ac);
1295                         }
1296                 }
1297                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1298         }
1299
1300         return 0;
1301  err_del_interface:
1302         drv_remove_interface(local, sdata);
1303  err_stop:
1304         if (!local->open_count)
1305                 drv_stop(local);
1306  err_del_bss:
1307         sdata->bss = NULL;
1308         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1309                 mutex_lock(&local->mtx);
1310                 list_del(&sdata->u.vlan.list);
1311                 mutex_unlock(&local->mtx);
1312         }
1313         /* might already be clear but that doesn't matter */
1314         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1315         return res;
1316 }
1317
1318 static void ieee80211_if_free(struct net_device *dev)
1319 {
1320         free_percpu(dev->tstats);
1321 }
1322
1323 static void ieee80211_if_setup(struct net_device *dev)
1324 {
1325         ether_setup(dev);
1326         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1327         dev->netdev_ops = &ieee80211_dataif_ops;
1328         dev->needs_free_netdev = true;
1329         dev->priv_destructor = ieee80211_if_free;
1330 }
1331
1332 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1333 {
1334         ieee80211_if_setup(dev);
1335         dev->priv_flags |= IFF_NO_QUEUE;
1336 }
1337
1338 static void ieee80211_iface_work(struct work_struct *work)
1339 {
1340         struct ieee80211_sub_if_data *sdata =
1341                 container_of(work, struct ieee80211_sub_if_data, work);
1342         struct ieee80211_local *local = sdata->local;
1343         struct sk_buff *skb;
1344         struct sta_info *sta;
1345
1346         if (!ieee80211_sdata_running(sdata))
1347                 return;
1348
1349         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1350                 return;
1351
1352         if (!ieee80211_can_run_worker(local))
1353                 return;
1354
1355         /* first process frames */
1356         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1357                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1358
1359                 if (ieee80211_is_action(mgmt->frame_control) &&
1360                     mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1361                         int len = skb->len;
1362
1363                         mutex_lock(&local->sta_mtx);
1364                         sta = sta_info_get_bss(sdata, mgmt->sa);
1365                         if (sta) {
1366                                 switch (mgmt->u.action.u.addba_req.action_code) {
1367                                 case WLAN_ACTION_ADDBA_REQ:
1368                                         ieee80211_process_addba_request(
1369                                                         local, sta, mgmt, len);
1370                                         break;
1371                                 case WLAN_ACTION_ADDBA_RESP:
1372                                         ieee80211_process_addba_resp(local, sta,
1373                                                                      mgmt, len);
1374                                         break;
1375                                 case WLAN_ACTION_DELBA:
1376                                         ieee80211_process_delba(sdata, sta,
1377                                                                 mgmt, len);
1378                                         break;
1379                                 default:
1380                                         WARN_ON(1);
1381                                         break;
1382                                 }
1383                         }
1384                         mutex_unlock(&local->sta_mtx);
1385                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1386                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1387                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1388                         case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1389                                 struct ieee80211_rx_status *status;
1390                                 enum nl80211_band band;
1391                                 u8 opmode;
1392
1393                                 status = IEEE80211_SKB_RXCB(skb);
1394                                 band = status->band;
1395                                 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1396
1397                                 mutex_lock(&local->sta_mtx);
1398                                 sta = sta_info_get_bss(sdata, mgmt->sa);
1399
1400                                 if (sta)
1401                                         ieee80211_vht_handle_opmode(sdata, sta,
1402                                                                     opmode,
1403                                                                     band);
1404
1405                                 mutex_unlock(&local->sta_mtx);
1406                                 break;
1407                         }
1408                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1409                                 ieee80211_process_mu_groups(sdata, mgmt);
1410                                 break;
1411                         default:
1412                                 WARN_ON(1);
1413                                 break;
1414                         }
1415                 } else if (ieee80211_is_ext(mgmt->frame_control)) {
1416                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
1417                                 ieee80211_sta_rx_queued_ext(sdata, skb);
1418                         else
1419                                 WARN_ON(1);
1420                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1421                         struct ieee80211_hdr *hdr = (void *)mgmt;
1422                         /*
1423                          * So the frame isn't mgmt, but frame_control
1424                          * is at the right place anyway, of course, so
1425                          * the if statement is correct.
1426                          *
1427                          * Warn if we have other data frame types here,
1428                          * they must not get here.
1429                          */
1430                         WARN_ON(hdr->frame_control &
1431                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1432                         WARN_ON(!(hdr->seq_ctrl &
1433                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1434                         /*
1435                          * This was a fragment of a frame, received while
1436                          * a block-ack session was active. That cannot be
1437                          * right, so terminate the session.
1438                          */
1439                         mutex_lock(&local->sta_mtx);
1440                         sta = sta_info_get_bss(sdata, mgmt->sa);
1441                         if (sta) {
1442                                 u16 tid = ieee80211_get_tid(hdr);
1443
1444                                 __ieee80211_stop_rx_ba_session(
1445                                         sta, tid, WLAN_BACK_RECIPIENT,
1446                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1447                                         true);
1448                         }
1449                         mutex_unlock(&local->sta_mtx);
1450                 } else switch (sdata->vif.type) {
1451                 case NL80211_IFTYPE_STATION:
1452                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1453                         break;
1454                 case NL80211_IFTYPE_ADHOC:
1455                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1456                         break;
1457                 case NL80211_IFTYPE_MESH_POINT:
1458                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1459                                 break;
1460                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1461                         break;
1462                 default:
1463                         WARN(1, "frame for unexpected interface type");
1464                         break;
1465                 }
1466
1467                 kfree_skb(skb);
1468         }
1469
1470         /* then other type-dependent work */
1471         switch (sdata->vif.type) {
1472         case NL80211_IFTYPE_STATION:
1473                 ieee80211_sta_work(sdata);
1474                 break;
1475         case NL80211_IFTYPE_ADHOC:
1476                 ieee80211_ibss_work(sdata);
1477                 break;
1478         case NL80211_IFTYPE_MESH_POINT:
1479                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1480                         break;
1481                 ieee80211_mesh_work(sdata);
1482                 break;
1483         case NL80211_IFTYPE_OCB:
1484                 ieee80211_ocb_work(sdata);
1485                 break;
1486         default:
1487                 break;
1488         }
1489 }
1490
1491 static void ieee80211_recalc_smps_work(struct work_struct *work)
1492 {
1493         struct ieee80211_sub_if_data *sdata =
1494                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1495
1496         ieee80211_recalc_smps(sdata);
1497 }
1498
1499 /*
1500  * Helper function to initialise an interface to a specific type.
1501  */
1502 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1503                                   enum nl80211_iftype type)
1504 {
1505         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1506                                                     0xff, 0xff, 0xff};
1507
1508         /* clear type-dependent union */
1509         memset(&sdata->u, 0, sizeof(sdata->u));
1510
1511         /* and set some type-dependent values */
1512         sdata->vif.type = type;
1513         sdata->vif.p2p = false;
1514         sdata->wdev.iftype = type;
1515
1516         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1517         sdata->control_port_no_encrypt = false;
1518         sdata->control_port_over_nl80211 = false;
1519         sdata->control_port_no_preauth = false;
1520         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1521         sdata->vif.bss_conf.idle = true;
1522         sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1523
1524         sdata->noack_map = 0;
1525
1526         /* only monitor/p2p-device differ */
1527         if (sdata->dev) {
1528                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1529                 sdata->dev->type = ARPHRD_ETHER;
1530         }
1531
1532         skb_queue_head_init(&sdata->skb_queue);
1533         INIT_WORK(&sdata->work, ieee80211_iface_work);
1534         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1535         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1536         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1537         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1538
1539         switch (type) {
1540         case NL80211_IFTYPE_P2P_GO:
1541                 type = NL80211_IFTYPE_AP;
1542                 sdata->vif.type = type;
1543                 sdata->vif.p2p = true;
1544                 fallthrough;
1545         case NL80211_IFTYPE_AP:
1546                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1547                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1548                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1549                 break;
1550         case NL80211_IFTYPE_P2P_CLIENT:
1551                 type = NL80211_IFTYPE_STATION;
1552                 sdata->vif.type = type;
1553                 sdata->vif.p2p = true;
1554                 fallthrough;
1555         case NL80211_IFTYPE_STATION:
1556                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1557                 ieee80211_sta_setup_sdata(sdata);
1558                 break;
1559         case NL80211_IFTYPE_OCB:
1560                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1561                 ieee80211_ocb_setup_sdata(sdata);
1562                 break;
1563         case NL80211_IFTYPE_ADHOC:
1564                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1565                 ieee80211_ibss_setup_sdata(sdata);
1566                 break;
1567         case NL80211_IFTYPE_MESH_POINT:
1568                 if (ieee80211_vif_is_mesh(&sdata->vif))
1569                         ieee80211_mesh_init_sdata(sdata);
1570                 break;
1571         case NL80211_IFTYPE_MONITOR:
1572                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1573                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1574                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1575                                       MONITOR_FLAG_OTHER_BSS;
1576                 break;
1577         case NL80211_IFTYPE_WDS:
1578                 sdata->vif.bss_conf.bssid = NULL;
1579                 break;
1580         case NL80211_IFTYPE_NAN:
1581                 idr_init(&sdata->u.nan.function_inst_ids);
1582                 spin_lock_init(&sdata->u.nan.func_lock);
1583                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1584                 break;
1585         case NL80211_IFTYPE_AP_VLAN:
1586         case NL80211_IFTYPE_P2P_DEVICE:
1587                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1588                 break;
1589         case NL80211_IFTYPE_UNSPECIFIED:
1590         case NUM_NL80211_IFTYPES:
1591                 WARN_ON(1);
1592                 break;
1593         }
1594
1595         ieee80211_debugfs_add_netdev(sdata);
1596 }
1597
1598 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1599                                            enum nl80211_iftype type)
1600 {
1601         struct ieee80211_local *local = sdata->local;
1602         int ret, err;
1603         enum nl80211_iftype internal_type = type;
1604         bool p2p = false;
1605
1606         ASSERT_RTNL();
1607
1608         if (!local->ops->change_interface)
1609                 return -EBUSY;
1610
1611         switch (sdata->vif.type) {
1612         case NL80211_IFTYPE_AP:
1613         case NL80211_IFTYPE_STATION:
1614         case NL80211_IFTYPE_ADHOC:
1615         case NL80211_IFTYPE_OCB:
1616                 /*
1617                  * Could maybe also all others here?
1618                  * Just not sure how that interacts
1619                  * with the RX/config path e.g. for
1620                  * mesh.
1621                  */
1622                 break;
1623         default:
1624                 return -EBUSY;
1625         }
1626
1627         switch (type) {
1628         case NL80211_IFTYPE_AP:
1629         case NL80211_IFTYPE_STATION:
1630         case NL80211_IFTYPE_ADHOC:
1631         case NL80211_IFTYPE_OCB:
1632                 /*
1633                  * Could probably support everything
1634                  * but WDS here (WDS do_open can fail
1635                  * under memory pressure, which this
1636                  * code isn't prepared to handle).
1637                  */
1638                 break;
1639         case NL80211_IFTYPE_P2P_CLIENT:
1640                 p2p = true;
1641                 internal_type = NL80211_IFTYPE_STATION;
1642                 break;
1643         case NL80211_IFTYPE_P2P_GO:
1644                 p2p = true;
1645                 internal_type = NL80211_IFTYPE_AP;
1646                 break;
1647         default:
1648                 return -EBUSY;
1649         }
1650
1651         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1652         if (ret)
1653                 return ret;
1654
1655         ieee80211_do_stop(sdata, false);
1656
1657         ieee80211_teardown_sdata(sdata);
1658
1659         ieee80211_set_sdata_offload_flags(sdata);
1660         ret = drv_change_interface(local, sdata, internal_type, p2p);
1661         if (ret)
1662                 type = ieee80211_vif_type_p2p(&sdata->vif);
1663
1664         /*
1665          * Ignore return value here, there's not much we can do since
1666          * the driver changed the interface type internally already.
1667          * The warnings will hopefully make driver authors fix it :-)
1668          */
1669         ieee80211_check_queues(sdata, type);
1670
1671         ieee80211_setup_sdata(sdata, type);
1672         ieee80211_set_vif_encap_ops(sdata);
1673
1674         err = ieee80211_do_open(&sdata->wdev, false);
1675         WARN(err, "type change: do_open returned %d", err);
1676
1677         return ret;
1678 }
1679
1680 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1681                              enum nl80211_iftype type)
1682 {
1683         int ret;
1684
1685         ASSERT_RTNL();
1686
1687         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1688                 return 0;
1689
1690         if (ieee80211_sdata_running(sdata)) {
1691                 ret = ieee80211_runtime_change_iftype(sdata, type);
1692                 if (ret)
1693                         return ret;
1694         } else {
1695                 /* Purge and reset type-dependent state. */
1696                 ieee80211_teardown_sdata(sdata);
1697                 ieee80211_setup_sdata(sdata, type);
1698         }
1699
1700         /* reset some values that shouldn't be kept across type changes */
1701         if (type == NL80211_IFTYPE_STATION)
1702                 sdata->u.mgd.use_4addr = false;
1703
1704         return 0;
1705 }
1706
1707 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1708                                        u8 *perm_addr, enum nl80211_iftype type)
1709 {
1710         struct ieee80211_sub_if_data *sdata;
1711         u64 mask, start, addr, val, inc;
1712         u8 *m;
1713         u8 tmp_addr[ETH_ALEN];
1714         int i;
1715
1716         /* default ... something at least */
1717         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1718
1719         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1720             local->hw.wiphy->n_addresses <= 1)
1721                 return;
1722
1723         mutex_lock(&local->iflist_mtx);
1724
1725         switch (type) {
1726         case NL80211_IFTYPE_MONITOR:
1727                 /* doesn't matter */
1728                 break;
1729         case NL80211_IFTYPE_WDS:
1730         case NL80211_IFTYPE_AP_VLAN:
1731                 /* match up with an AP interface */
1732                 list_for_each_entry(sdata, &local->interfaces, list) {
1733                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1734                                 continue;
1735                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1736                         break;
1737                 }
1738                 /* keep default if no AP interface present */
1739                 break;
1740         case NL80211_IFTYPE_P2P_CLIENT:
1741         case NL80211_IFTYPE_P2P_GO:
1742                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1743                         list_for_each_entry(sdata, &local->interfaces, list) {
1744                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1745                                         continue;
1746                                 if (!ieee80211_sdata_running(sdata))
1747                                         continue;
1748                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1749                                 goto out_unlock;
1750                         }
1751                 }
1752                 fallthrough;
1753         default:
1754                 /* assign a new address if possible -- try n_addresses first */
1755                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1756                         bool used = false;
1757
1758                         list_for_each_entry(sdata, &local->interfaces, list) {
1759                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1760                                                      sdata->vif.addr)) {
1761                                         used = true;
1762                                         break;
1763                                 }
1764                         }
1765
1766                         if (!used) {
1767                                 memcpy(perm_addr,
1768                                        local->hw.wiphy->addresses[i].addr,
1769                                        ETH_ALEN);
1770                                 break;
1771                         }
1772                 }
1773
1774                 /* try mask if available */
1775                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1776                         break;
1777
1778                 m = local->hw.wiphy->addr_mask;
1779                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1780                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1781                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1782
1783                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1784                         /* not a contiguous mask ... not handled now! */
1785                         pr_info("not contiguous\n");
1786                         break;
1787                 }
1788
1789                 /*
1790                  * Pick address of existing interface in case user changed
1791                  * MAC address manually, default to perm_addr.
1792                  */
1793                 m = local->hw.wiphy->perm_addr;
1794                 list_for_each_entry(sdata, &local->interfaces, list) {
1795                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1796                                 continue;
1797                         m = sdata->vif.addr;
1798                         break;
1799                 }
1800                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1801                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1802                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1803
1804                 inc = 1ULL<<__ffs64(mask);
1805                 val = (start & mask);
1806                 addr = (start & ~mask) | (val & mask);
1807                 do {
1808                         bool used = false;
1809
1810                         tmp_addr[5] = addr >> 0*8;
1811                         tmp_addr[4] = addr >> 1*8;
1812                         tmp_addr[3] = addr >> 2*8;
1813                         tmp_addr[2] = addr >> 3*8;
1814                         tmp_addr[1] = addr >> 4*8;
1815                         tmp_addr[0] = addr >> 5*8;
1816
1817                         val += inc;
1818
1819                         list_for_each_entry(sdata, &local->interfaces, list) {
1820                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1821                                         used = true;
1822                                         break;
1823                                 }
1824                         }
1825
1826                         if (!used) {
1827                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1828                                 break;
1829                         }
1830                         addr = (start & ~mask) | (val & mask);
1831                 } while (addr != start);
1832
1833                 break;
1834         }
1835
1836  out_unlock:
1837         mutex_unlock(&local->iflist_mtx);
1838 }
1839
1840 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1841                      unsigned char name_assign_type,
1842                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1843                      struct vif_params *params)
1844 {
1845         struct net_device *ndev = NULL;
1846         struct ieee80211_sub_if_data *sdata = NULL;
1847         struct txq_info *txqi;
1848         void (*if_setup)(struct net_device *dev);
1849         int ret, i;
1850         int txqs = 1;
1851
1852         ASSERT_RTNL();
1853
1854         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1855                 struct wireless_dev *wdev;
1856
1857                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1858                                 GFP_KERNEL);
1859                 if (!sdata)
1860                         return -ENOMEM;
1861                 wdev = &sdata->wdev;
1862
1863                 sdata->dev = NULL;
1864                 strlcpy(sdata->name, name, IFNAMSIZ);
1865                 ieee80211_assign_perm_addr(local, wdev->address, type);
1866                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1867         } else {
1868                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1869                                  sizeof(void *));
1870                 int txq_size = 0;
1871
1872                 if (local->ops->wake_tx_queue &&
1873                     type != NL80211_IFTYPE_AP_VLAN &&
1874                     (type != NL80211_IFTYPE_MONITOR ||
1875                      (params->flags & MONITOR_FLAG_ACTIVE)))
1876                         txq_size += sizeof(struct txq_info) +
1877                                     local->hw.txq_data_size;
1878
1879                 if (local->ops->wake_tx_queue) {
1880                         if_setup = ieee80211_if_setup_no_queue;
1881                 } else {
1882                         if_setup = ieee80211_if_setup;
1883                         if (local->hw.queues >= IEEE80211_NUM_ACS)
1884                                 txqs = IEEE80211_NUM_ACS;
1885                 }
1886
1887                 ndev = alloc_netdev_mqs(size + txq_size,
1888                                         name, name_assign_type,
1889                                         if_setup, txqs, 1);
1890                 if (!ndev)
1891                         return -ENOMEM;
1892
1893                 if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len)
1894                         ndev->tx_queue_len = local->hw.wiphy->tx_queue_len;
1895
1896                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1897
1898                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1899                 if (!ndev->tstats) {
1900                         free_netdev(ndev);
1901                         return -ENOMEM;
1902                 }
1903
1904                 ndev->needed_headroom = local->tx_headroom +
1905                                         4*6 /* four MAC addresses */
1906                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1907                                         + 6 /* mesh */
1908                                         + 8 /* rfc1042/bridge tunnel */
1909                                         - ETH_HLEN /* ethernet hard_header_len */
1910                                         + IEEE80211_ENCRYPT_HEADROOM;
1911                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1912
1913                 ret = dev_alloc_name(ndev, ndev->name);
1914                 if (ret < 0) {
1915                         ieee80211_if_free(ndev);
1916                         free_netdev(ndev);
1917                         return ret;
1918                 }
1919
1920                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1921                 if (is_valid_ether_addr(params->macaddr))
1922                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1923                 else
1924                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1925                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1926
1927                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1928                 sdata = netdev_priv(ndev);
1929                 ndev->ieee80211_ptr = &sdata->wdev;
1930                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1931                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1932
1933                 if (txq_size) {
1934                         txqi = netdev_priv(ndev) + size;
1935                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1936                 }
1937
1938                 sdata->dev = ndev;
1939         }
1940
1941         /* initialise type-independent data */
1942         sdata->wdev.wiphy = local->hw.wiphy;
1943         sdata->local = local;
1944
1945         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1946                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1947
1948         INIT_LIST_HEAD(&sdata->key_list);
1949
1950         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1951                           ieee80211_dfs_cac_timer_work);
1952         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1953                           ieee80211_delayed_tailroom_dec);
1954
1955         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1956                 struct ieee80211_supported_band *sband;
1957                 sband = local->hw.wiphy->bands[i];
1958                 sdata->rc_rateidx_mask[i] =
1959                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1960                 if (sband) {
1961                         __le16 cap;
1962                         u16 *vht_rate_mask;
1963
1964                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1965                                sband->ht_cap.mcs.rx_mask,
1966                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1967
1968                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1969                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1970                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1971                 } else {
1972                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1973                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1974                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1975                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1976                 }
1977         }
1978
1979         ieee80211_set_default_queues(sdata);
1980
1981         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
1982         sdata->user_power_level = local->user_power_level;
1983
1984         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1985
1986         /* setup type-dependent data */
1987         ieee80211_setup_sdata(sdata, type);
1988
1989         if (ndev) {
1990                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
1991                 if (type == NL80211_IFTYPE_STATION)
1992                         sdata->u.mgd.use_4addr = params->use_4addr;
1993
1994                 ndev->features |= local->hw.netdev_features;
1995                 ndev->hw_features |= ndev->features &
1996                                         MAC80211_SUPPORTED_FEATURES_TX;
1997
1998                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
1999
2000                 /* MTU range: 256 - 2304 */
2001                 ndev->min_mtu = 256;
2002                 ndev->max_mtu = local->hw.max_mtu;
2003
2004                 ret = register_netdevice(ndev);
2005                 if (ret) {
2006                         free_netdev(ndev);
2007                         return ret;
2008                 }
2009         }
2010
2011         mutex_lock(&local->iflist_mtx);
2012         list_add_tail_rcu(&sdata->list, &local->interfaces);
2013         mutex_unlock(&local->iflist_mtx);
2014
2015         if (new_wdev)
2016                 *new_wdev = &sdata->wdev;
2017
2018         return 0;
2019 }
2020
2021 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2022 {
2023         ASSERT_RTNL();
2024
2025         mutex_lock(&sdata->local->iflist_mtx);
2026         list_del_rcu(&sdata->list);
2027         mutex_unlock(&sdata->local->iflist_mtx);
2028
2029         if (sdata->vif.txq)
2030                 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2031
2032         synchronize_rcu();
2033
2034         if (sdata->dev) {
2035                 unregister_netdevice(sdata->dev);
2036         } else {
2037                 cfg80211_unregister_wdev(&sdata->wdev);
2038                 ieee80211_teardown_sdata(sdata);
2039                 kfree(sdata);
2040         }
2041 }
2042
2043 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2044 {
2045         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2046                 return;
2047         ieee80211_do_stop(sdata, true);
2048 }
2049
2050 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2051 {
2052         struct ieee80211_sub_if_data *sdata, *tmp;
2053         LIST_HEAD(unreg_list);
2054         LIST_HEAD(wdev_list);
2055
2056         ASSERT_RTNL();
2057
2058         /* Before destroying the interfaces, make sure they're all stopped so
2059          * that the hardware is stopped. Otherwise, the driver might still be
2060          * iterating the interfaces during the shutdown, e.g. from a worker
2061          * or from RX processing or similar, and if it does so (using atomic
2062          * iteration) while we're manipulating the list, the iteration will
2063          * crash.
2064          *
2065          * After this, the hardware should be stopped and the driver should
2066          * have stopped all of its activities, so that we can do RCU-unaware
2067          * manipulations of the interface list below.
2068          */
2069         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2070
2071         WARN(local->open_count, "%s: open count remains %d\n",
2072              wiphy_name(local->hw.wiphy), local->open_count);
2073
2074         ieee80211_txq_teardown_flows(local);
2075
2076         mutex_lock(&local->iflist_mtx);
2077         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
2078                 list_del(&sdata->list);
2079
2080                 if (sdata->dev)
2081                         unregister_netdevice_queue(sdata->dev, &unreg_list);
2082                 else
2083                         list_add(&sdata->list, &wdev_list);
2084         }
2085         mutex_unlock(&local->iflist_mtx);
2086         unregister_netdevice_many(&unreg_list);
2087
2088         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2089                 list_del(&sdata->list);
2090                 cfg80211_unregister_wdev(&sdata->wdev);
2091                 kfree(sdata);
2092         }
2093 }
2094
2095 static int netdev_notify(struct notifier_block *nb,
2096                          unsigned long state, void *ptr)
2097 {
2098         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2099         struct ieee80211_sub_if_data *sdata;
2100
2101         if (state != NETDEV_CHANGENAME)
2102                 return NOTIFY_DONE;
2103
2104         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2105                 return NOTIFY_DONE;
2106
2107         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2108                 return NOTIFY_DONE;
2109
2110         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2111         memcpy(sdata->name, dev->name, IFNAMSIZ);
2112         ieee80211_debugfs_rename_netdev(sdata);
2113
2114         return NOTIFY_OK;
2115 }
2116
2117 static struct notifier_block mac80211_netdev_notifier = {
2118         .notifier_call = netdev_notify,
2119 };
2120
2121 int ieee80211_iface_init(void)
2122 {
2123         return register_netdevice_notifier(&mac80211_netdev_notifier);
2124 }
2125
2126 void ieee80211_iface_exit(void)
2127 {
2128         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2129 }
2130
2131 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2132 {
2133         if (sdata->vif.type == NL80211_IFTYPE_AP)
2134                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2135         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2136                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2137 }
2138
2139 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2140 {
2141         if (sdata->vif.type == NL80211_IFTYPE_AP)
2142                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2143         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2144                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2145 }