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         int i;
 713
 714         for_each_possible_cpu(i) {
 715                 const struct pcpu_sw_netstats *tstats;
 716                 u64 rx_packets, rx_bytes, tx_packets, tx_bytes;
 717                 unsigned int start;
 718
 719                 tstats = per_cpu_ptr(dev->tstats, i);
 720
 721                 do {
 722                         start = u64_stats_fetch_begin_irq(&tstats->syncp);
 723                         rx_packets = tstats->rx_packets;
 724                         tx_packets = tstats->tx_packets;
 725                         rx_bytes = tstats->rx_bytes;
 726                         tx_bytes = tstats->tx_bytes;
 727                 } while (u64_stats_fetch_retry_irq(&tstats->syncp, start));
 728
 729                 stats->rx_packets += rx_packets;
 730                 stats->tx_packets += tx_packets;
 731                 stats->rx_bytes   += rx_bytes;
 732                 stats->tx_bytes   += tx_bytes;
 733         }
 734 }
 735
 736 static const struct net_device_ops ieee80211_dataif_ops = {
 737         .ndo_open               = ieee80211_open,
 738         .ndo_stop               = ieee80211_stop,
 739         .ndo_uninit             = ieee80211_uninit,
 740         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 741         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 742         .ndo_set_mac_address    = ieee80211_change_mac,
 743         .ndo_select_queue       = ieee80211_netdev_select_queue,
 744         .ndo_get_stats64        = ieee80211_get_stats64,
 745 };
 746
 747 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 748                                           struct sk_buff *skb,
 749                                           struct net_device *sb_dev)
 750 {
 751         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 752         struct ieee80211_local *local = sdata->local;
 753         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 754         struct ieee80211_hdr *hdr;
 755         int len_rthdr;
 756
 757         if (local->hw.queues < IEEE80211_NUM_ACS)
 758                 return 0;
 759
 760         /* reset flags and info before parsing radiotap header */
 761         memset(info, 0, sizeof(*info));
 762
 763         if (!ieee80211_parse_tx_radiotap(skb, dev))
 764                 return 0; /* doesn't matter, frame will be dropped */
 765
 766         len_rthdr = ieee80211_get_radiotap_len(skb->data);
 767         hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
 768         if (skb->len < len_rthdr + 2 ||
 769             skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
 770                 return 0; /* doesn't matter, frame will be dropped */
 771
 772         return ieee80211_select_queue_80211(sdata, skb, hdr);
 773 }
 774
 775 static const struct net_device_ops ieee80211_monitorif_ops = {
 776         .ndo_open               = ieee80211_open,
 777         .ndo_stop               = ieee80211_stop,
 778         .ndo_uninit             = ieee80211_uninit,
 779         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 780         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 781         .ndo_set_mac_address    = ieee80211_change_mac,
 782         .ndo_select_queue       = ieee80211_monitor_select_queue,
 783         .ndo_get_stats64        = ieee80211_get_stats64,
 784 };
 785
 786 static const struct net_device_ops ieee80211_dataif_8023_ops = {
 787         .ndo_open               = ieee80211_open,
 788         .ndo_stop               = ieee80211_stop,
 789         .ndo_uninit             = ieee80211_uninit,
 790         .ndo_start_xmit         = ieee80211_subif_start_xmit_8023,
 791         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 792         .ndo_set_mac_address    = ieee80211_change_mac,
 793         .ndo_select_queue       = ieee80211_netdev_select_queue,
 794         .ndo_get_stats64        = ieee80211_get_stats64,
 795 };
 796
 797 static bool ieee80211_iftype_supports_encap_offload(enum nl80211_iftype iftype)
 798 {
 799         switch (iftype) {
 800         /* P2P GO and client are mapped to AP/STATION types */
 801         case NL80211_IFTYPE_AP:
 802         case NL80211_IFTYPE_STATION:
 803                 return true;
 804         default:
 805                 return false;
 806         }
 807 }
 808
 809 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
 810 {
 811         struct ieee80211_local *local = sdata->local;
 812         u32 flags;
 813
 814         flags = sdata->vif.offload_flags;
 815
 816         if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
 817             ieee80211_iftype_supports_encap_offload(sdata->vif.type)) {
 818                 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
 819
 820                 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
 821                     local->hw.wiphy->frag_threshold != (u32)-1)
 822                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 823
 824                 if (local->monitors)
 825                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 826         } else {
 827                 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 828         }
 829
 830         if (sdata->vif.offload_flags == flags)
 831                 return false;
 832
 833         sdata->vif.offload_flags = flags;
 834         return true;
 835 }
 836
 837 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
 838 {
 839         struct ieee80211_local *local = sdata->local;
 840         struct ieee80211_sub_if_data *bss = sdata;
 841         bool enabled;
 842
 843         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 844                 if (!sdata->bss)
 845                         return;
 846
 847                 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
 848         }
 849
 850         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
 851             !ieee80211_iftype_supports_encap_offload(bss->vif.type))
 852                 return;
 853
 854         enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
 855         if (sdata->wdev.use_4addr &&
 856             !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
 857                 enabled = false;
 858
 859         sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
 860                                            &ieee80211_dataif_ops;
 861 }
 862
 863 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
 864 {
 865         struct ieee80211_local *local = sdata->local;
 866         struct ieee80211_sub_if_data *vsdata;
 867
 868         if (ieee80211_set_sdata_offload_flags(sdata)) {
 869                 drv_update_vif_offload(local, sdata);
 870                 ieee80211_set_vif_encap_ops(sdata);
 871         }
 872
 873         list_for_each_entry(vsdata, &local->interfaces, list) {
 874                 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
 875                     vsdata->bss != &sdata->u.ap)
 876                         continue;
 877
 878                 ieee80211_set_vif_encap_ops(vsdata);
 879         }
 880 }
 881
 882 void ieee80211_recalc_offload(struct ieee80211_local *local)
 883 {
 884         struct ieee80211_sub_if_data *sdata;
 885
 886         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
 887                 return;
 888
 889         mutex_lock(&local->iflist_mtx);
 890
 891         list_for_each_entry(sdata, &local->interfaces, list) {
 892                 if (!ieee80211_sdata_running(sdata))
 893                         continue;
 894
 895                 ieee80211_recalc_sdata_offload(sdata);
 896         }
 897
 898         mutex_unlock(&local->iflist_mtx);
 899 }
 900
 901 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
 902                                     const int offset)
 903 {
 904         struct ieee80211_local *local = sdata->local;
 905         u32 flags = sdata->u.mntr.flags;
 906
 907 #define ADJUST(_f, _s)  do {                                    \
 908         if (flags & MONITOR_FLAG_##_f)                          \
 909                 local->fif_##_s += offset;                      \
 910         } while (0)
 911
 912         ADJUST(FCSFAIL, fcsfail);
 913         ADJUST(PLCPFAIL, plcpfail);
 914         ADJUST(CONTROL, control);
 915         ADJUST(CONTROL, pspoll);
 916         ADJUST(OTHER_BSS, other_bss);
 917
 918 #undef ADJUST
 919 }
 920
 921 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
 922 {
 923         struct ieee80211_local *local = sdata->local;
 924         int i;
 925
 926         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 927                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
 928                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
 929                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
 930                         sdata->vif.hw_queue[i] = i;
 931                 else
 932                         sdata->vif.hw_queue[i] = 0;
 933         }
 934         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 935 }
 936
 937 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
 938 {
 939         struct ieee80211_sub_if_data *sdata;
 940         int ret;
 941
 942         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
 943                 return 0;
 944
 945         ASSERT_RTNL();
 946
 947         if (local->monitor_sdata)
 948                 return 0;
 949
 950         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
 951         if (!sdata)
 952                 return -ENOMEM;
 953
 954         /* set up data */
 955         sdata->local = local;
 956         sdata->vif.type = NL80211_IFTYPE_MONITOR;
 957         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
 958                  wiphy_name(local->hw.wiphy));
 959         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
 960
 961         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
 962
 963         ieee80211_set_default_queues(sdata);
 964
 965         ret = drv_add_interface(local, sdata);
 966         if (WARN_ON(ret)) {
 967                 /* ok .. stupid driver, it asked for this! */
 968                 kfree(sdata);
 969                 return ret;
 970         }
 971
 972         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
 973         if (ret) {
 974                 kfree(sdata);
 975                 return ret;
 976         }
 977
 978         mutex_lock(&local->iflist_mtx);
 979         rcu_assign_pointer(local->monitor_sdata, sdata);
 980         mutex_unlock(&local->iflist_mtx);
 981
 982         mutex_lock(&local->mtx);
 983         ret = ieee80211_vif_use_channel(sdata, &local->monitor_chandef,
 984                                         IEEE80211_CHANCTX_EXCLUSIVE);
 985         mutex_unlock(&local->mtx);
 986         if (ret) {
 987                 mutex_lock(&local->iflist_mtx);
 988                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
 989                 mutex_unlock(&local->iflist_mtx);
 990                 synchronize_net();
 991                 drv_remove_interface(local, sdata);
 992                 kfree(sdata);
 993                 return ret;
 994         }
 995
 996         skb_queue_head_init(&sdata->skb_queue);
 997         INIT_WORK(&sdata->work, ieee80211_iface_work);
 998
 999         return 0;
1000 }
1001
1002 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
1003 {
1004         struct ieee80211_sub_if_data *sdata;
1005
1006         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1007                 return;
1008
1009         ASSERT_RTNL();
1010
1011         mutex_lock(&local->iflist_mtx);
1012
1013         sdata = rcu_dereference_protected(local->monitor_sdata,
1014                                           lockdep_is_held(&local->iflist_mtx));
1015         if (!sdata) {
1016                 mutex_unlock(&local->iflist_mtx);
1017                 return;
1018         }
1019
1020         RCU_INIT_POINTER(local->monitor_sdata, NULL);
1021         mutex_unlock(&local->iflist_mtx);
1022
1023         synchronize_net();
1024
1025         mutex_lock(&local->mtx);
1026         ieee80211_vif_release_channel(sdata);
1027         mutex_unlock(&local->mtx);
1028
1029         drv_remove_interface(local, sdata);
1030
1031         kfree(sdata);
1032 }
1033
1034 /*
1035  * NOTE: Be very careful when changing this function, it must NOT return
1036  * an error on interface type changes that have been pre-checked, so most
1037  * checks should be in ieee80211_check_concurrent_iface.
1038  */
1039 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1040 {
1041         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1042         struct net_device *dev = wdev->netdev;
1043         struct ieee80211_local *local = sdata->local;
1044         struct sta_info *sta;
1045         u32 changed = 0;
1046         int res;
1047         u32 hw_reconf_flags = 0;
1048
1049         switch (sdata->vif.type) {
1050         case NL80211_IFTYPE_WDS:
1051                 if (!is_valid_ether_addr(sdata->u.wds.remote_addr))
1052                         return -ENOLINK;
1053                 break;
1054         case NL80211_IFTYPE_AP_VLAN: {
1055                 struct ieee80211_sub_if_data *master;
1056
1057                 if (!sdata->bss)
1058                         return -ENOLINK;
1059
1060                 mutex_lock(&local->mtx);
1061                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1062                 mutex_unlock(&local->mtx);
1063
1064                 master = container_of(sdata->bss,
1065                                       struct ieee80211_sub_if_data, u.ap);
1066                 sdata->control_port_protocol =
1067                         master->control_port_protocol;
1068                 sdata->control_port_no_encrypt =
1069                         master->control_port_no_encrypt;
1070                 sdata->control_port_over_nl80211 =
1071                         master->control_port_over_nl80211;
1072                 sdata->control_port_no_preauth =
1073                         master->control_port_no_preauth;
1074                 sdata->vif.cab_queue = master->vif.cab_queue;
1075                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1076                        sizeof(sdata->vif.hw_queue));
1077                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1078
1079                 mutex_lock(&local->key_mtx);
1080                 sdata->crypto_tx_tailroom_needed_cnt +=
1081                         master->crypto_tx_tailroom_needed_cnt;
1082                 mutex_unlock(&local->key_mtx);
1083
1084                 break;
1085                 }
1086         case NL80211_IFTYPE_AP:
1087                 sdata->bss = &sdata->u.ap;
1088                 break;
1089         case NL80211_IFTYPE_MESH_POINT:
1090         case NL80211_IFTYPE_STATION:
1091         case NL80211_IFTYPE_MONITOR:
1092         case NL80211_IFTYPE_ADHOC:
1093         case NL80211_IFTYPE_P2P_DEVICE:
1094         case NL80211_IFTYPE_OCB:
1095         case NL80211_IFTYPE_NAN:
1096                 /* no special treatment */
1097                 break;
1098         case NL80211_IFTYPE_UNSPECIFIED:
1099         case NUM_NL80211_IFTYPES:
1100         case NL80211_IFTYPE_P2P_CLIENT:
1101         case NL80211_IFTYPE_P2P_GO:
1102                 /* cannot happen */
1103                 WARN_ON(1);
1104                 break;
1105         }
1106
1107         if (local->open_count == 0) {
1108                 res = drv_start(local);
1109                 if (res)
1110                         goto err_del_bss;
1111                 /* we're brought up, everything changes */
1112                 hw_reconf_flags = ~0;
1113                 ieee80211_led_radio(local, true);
1114                 ieee80211_mod_tpt_led_trig(local,
1115                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1116         }
1117
1118         /*
1119          * Copy the hopefully now-present MAC address to
1120          * this interface, if it has the special null one.
1121          */
1122         if (dev && is_zero_ether_addr(dev->dev_addr)) {
1123                 memcpy(dev->dev_addr,
1124                        local->hw.wiphy->perm_addr,
1125                        ETH_ALEN);
1126                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1127
1128                 if (!is_valid_ether_addr(dev->dev_addr)) {
1129                         res = -EADDRNOTAVAIL;
1130                         goto err_stop;
1131                 }
1132         }
1133
1134         switch (sdata->vif.type) {
1135         case NL80211_IFTYPE_AP_VLAN:
1136                 /* no need to tell driver, but set carrier and chanctx */
1137                 if (rtnl_dereference(sdata->bss->beacon)) {
1138                         ieee80211_vif_vlan_copy_chanctx(sdata);
1139                         netif_carrier_on(dev);
1140                         ieee80211_set_vif_encap_ops(sdata);
1141                 } else {
1142                         netif_carrier_off(dev);
1143                 }
1144                 break;
1145         case NL80211_IFTYPE_MONITOR:
1146                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1147                         local->cooked_mntrs++;
1148                         break;
1149                 }
1150
1151                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1152                         res = drv_add_interface(local, sdata);
1153                         if (res)
1154                                 goto err_stop;
1155                 } else if (local->monitors == 0 && local->open_count == 0) {
1156                         res = ieee80211_add_virtual_monitor(local);
1157                         if (res)
1158                                 goto err_stop;
1159                 }
1160
1161                 /* must be before the call to ieee80211_configure_filter */
1162                 local->monitors++;
1163                 if (local->monitors == 1) {
1164                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1165                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1166                 }
1167
1168                 ieee80211_adjust_monitor_flags(sdata, 1);
1169                 ieee80211_configure_filter(local);
1170                 ieee80211_recalc_offload(local);
1171                 mutex_lock(&local->mtx);
1172                 ieee80211_recalc_idle(local);
1173                 mutex_unlock(&local->mtx);
1174
1175                 netif_carrier_on(dev);
1176                 break;
1177         default:
1178                 if (coming_up) {
1179                         ieee80211_del_virtual_monitor(local);
1180                         ieee80211_set_sdata_offload_flags(sdata);
1181
1182                         res = drv_add_interface(local, sdata);
1183                         if (res)
1184                                 goto err_stop;
1185
1186                         ieee80211_set_vif_encap_ops(sdata);
1187                         res = ieee80211_check_queues(sdata,
1188                                 ieee80211_vif_type_p2p(&sdata->vif));
1189                         if (res)
1190                                 goto err_del_interface;
1191                 }
1192
1193                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1194                         local->fif_pspoll++;
1195                         local->fif_probe_req++;
1196
1197                         ieee80211_configure_filter(local);
1198                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1199                         local->fif_probe_req++;
1200                 }
1201
1202                 if (sdata->vif.probe_req_reg)
1203                         drv_config_iface_filter(local, sdata,
1204                                                 FIF_PROBE_REQ,
1205                                                 FIF_PROBE_REQ);
1206
1207                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1208                     sdata->vif.type != NL80211_IFTYPE_NAN)
1209                         changed |= ieee80211_reset_erp_info(sdata);
1210                 ieee80211_bss_info_change_notify(sdata, changed);
1211
1212                 switch (sdata->vif.type) {
1213                 case NL80211_IFTYPE_STATION:
1214                 case NL80211_IFTYPE_ADHOC:
1215                 case NL80211_IFTYPE_AP:
1216                 case NL80211_IFTYPE_MESH_POINT:
1217                 case NL80211_IFTYPE_OCB:
1218                         netif_carrier_off(dev);
1219                         break;
1220                 case NL80211_IFTYPE_WDS:
1221                 case NL80211_IFTYPE_P2P_DEVICE:
1222                 case NL80211_IFTYPE_NAN:
1223                         break;
1224                 default:
1225                         /* not reached */
1226                         WARN_ON(1);
1227                 }
1228
1229                 /*
1230                  * Set default queue parameters so drivers don't
1231                  * need to initialise the hardware if the hardware
1232                  * doesn't start up with sane defaults.
1233                  * Enable QoS for anything but station interfaces.
1234                  */
1235                 ieee80211_set_wmm_default(sdata, true,
1236                         sdata->vif.type != NL80211_IFTYPE_STATION);
1237         }
1238
1239         set_bit(SDATA_STATE_RUNNING, &sdata->state);
1240
1241         switch (sdata->vif.type) {
1242         case NL80211_IFTYPE_WDS:
1243                 /* Create STA entry for the WDS peer */
1244                 sta = sta_info_alloc(sdata, sdata->u.wds.remote_addr,
1245                                      GFP_KERNEL);
1246                 if (!sta) {
1247                         res = -ENOMEM;
1248                         goto err_del_interface;
1249                 }
1250
1251                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTH);
1252                 sta_info_pre_move_state(sta, IEEE80211_STA_ASSOC);
1253                 sta_info_pre_move_state(sta, IEEE80211_STA_AUTHORIZED);
1254
1255                 res = sta_info_insert(sta);
1256                 if (res) {
1257                         /* STA has been freed */
1258                         goto err_del_interface;
1259                 }
1260
1261                 rate_control_rate_init(sta);
1262                 netif_carrier_on(dev);
1263                 break;
1264         case NL80211_IFTYPE_P2P_DEVICE:
1265                 rcu_assign_pointer(local->p2p_sdata, sdata);
1266                 break;
1267         case NL80211_IFTYPE_MONITOR:
1268                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1269                         break;
1270                 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1271                 break;
1272         default:
1273                 break;
1274         }
1275
1276         /*
1277          * set_multicast_list will be invoked by the networking core
1278          * which will check whether any increments here were done in
1279          * error and sync them down to the hardware as filter flags.
1280          */
1281         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1282                 atomic_inc(&local->iff_allmultis);
1283
1284         if (coming_up)
1285                 local->open_count++;
1286
1287         if (hw_reconf_flags)
1288                 ieee80211_hw_config(local, hw_reconf_flags);
1289
1290         ieee80211_recalc_ps(local);
1291
1292         if (sdata->vif.type == NL80211_IFTYPE_MONITOR ||
1293             sdata->vif.type == NL80211_IFTYPE_AP_VLAN ||
1294             local->ops->wake_tx_queue) {
1295                 /* XXX: for AP_VLAN, actually track AP queues */
1296                 if (dev)
1297                         netif_tx_start_all_queues(dev);
1298         } else if (dev) {
1299                 unsigned long flags;
1300                 int n_acs = IEEE80211_NUM_ACS;
1301                 int ac;
1302
1303                 if (local->hw.queues < IEEE80211_NUM_ACS)
1304                         n_acs = 1;
1305
1306                 spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
1307                 if (sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE ||
1308                     (local->queue_stop_reasons[sdata->vif.cab_queue] == 0 &&
1309                      skb_queue_empty(&local->pending[sdata->vif.cab_queue]))) {
1310                         for (ac = 0; ac < n_acs; ac++) {
1311                                 int ac_queue = sdata->vif.hw_queue[ac];
1312
1313                                 if (local->queue_stop_reasons[ac_queue] == 0 &&
1314                                     skb_queue_empty(&local->pending[ac_queue]))
1315                                         netif_start_subqueue(dev, ac);
1316                         }
1317                 }
1318                 spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
1319         }
1320
1321         return 0;
1322  err_del_interface:
1323         drv_remove_interface(local, sdata);
1324  err_stop:
1325         if (!local->open_count)
1326                 drv_stop(local);
1327  err_del_bss:
1328         sdata->bss = NULL;
1329         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1330                 mutex_lock(&local->mtx);
1331                 list_del(&sdata->u.vlan.list);
1332                 mutex_unlock(&local->mtx);
1333         }
1334         /* might already be clear but that doesn't matter */
1335         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1336         return res;
1337 }
1338
1339 static void ieee80211_if_free(struct net_device *dev)
1340 {
1341         free_percpu(dev->tstats);
1342 }
1343
1344 static void ieee80211_if_setup(struct net_device *dev)
1345 {
1346         ether_setup(dev);
1347         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1348         dev->netdev_ops = &ieee80211_dataif_ops;
1349         dev->needs_free_netdev = true;
1350         dev->priv_destructor = ieee80211_if_free;
1351 }
1352
1353 static void ieee80211_if_setup_no_queue(struct net_device *dev)
1354 {
1355         ieee80211_if_setup(dev);
1356         dev->priv_flags |= IFF_NO_QUEUE;
1357 }
1358
1359 static void ieee80211_iface_work(struct work_struct *work)
1360 {
1361         struct ieee80211_sub_if_data *sdata =
1362                 container_of(work, struct ieee80211_sub_if_data, work);
1363         struct ieee80211_local *local = sdata->local;
1364         struct sk_buff *skb;
1365         struct sta_info *sta;
1366
1367         if (!ieee80211_sdata_running(sdata))
1368                 return;
1369
1370         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1371                 return;
1372
1373         if (!ieee80211_can_run_worker(local))
1374                 return;
1375
1376         /* first process frames */
1377         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1378                 struct ieee80211_mgmt *mgmt = (void *)skb->data;
1379
1380                 if (ieee80211_is_action(mgmt->frame_control) &&
1381                     mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1382                         int len = skb->len;
1383
1384                         mutex_lock(&local->sta_mtx);
1385                         sta = sta_info_get_bss(sdata, mgmt->sa);
1386                         if (sta) {
1387                                 switch (mgmt->u.action.u.addba_req.action_code) {
1388                                 case WLAN_ACTION_ADDBA_REQ:
1389                                         ieee80211_process_addba_request(
1390                                                         local, sta, mgmt, len);
1391                                         break;
1392                                 case WLAN_ACTION_ADDBA_RESP:
1393                                         ieee80211_process_addba_resp(local, sta,
1394                                                                      mgmt, len);
1395                                         break;
1396                                 case WLAN_ACTION_DELBA:
1397                                         ieee80211_process_delba(sdata, sta,
1398                                                                 mgmt, len);
1399                                         break;
1400                                 default:
1401                                         WARN_ON(1);
1402                                         break;
1403                                 }
1404                         }
1405                         mutex_unlock(&local->sta_mtx);
1406                 } else if (ieee80211_is_action(mgmt->frame_control) &&
1407                            mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1408                         switch (mgmt->u.action.u.vht_group_notif.action_code) {
1409                         case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1410                                 struct ieee80211_rx_status *status;
1411                                 enum nl80211_band band;
1412                                 u8 opmode;
1413
1414                                 status = IEEE80211_SKB_RXCB(skb);
1415                                 band = status->band;
1416                                 opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1417
1418                                 mutex_lock(&local->sta_mtx);
1419                                 sta = sta_info_get_bss(sdata, mgmt->sa);
1420
1421                                 if (sta)
1422                                         ieee80211_vht_handle_opmode(sdata, sta,
1423                                                                     opmode,
1424                                                                     band);
1425
1426                                 mutex_unlock(&local->sta_mtx);
1427                                 break;
1428                         }
1429                         case WLAN_VHT_ACTION_GROUPID_MGMT:
1430                                 ieee80211_process_mu_groups(sdata, mgmt);
1431                                 break;
1432                         default:
1433                                 WARN_ON(1);
1434                                 break;
1435                         }
1436                 } else if (ieee80211_is_ext(mgmt->frame_control)) {
1437                         if (sdata->vif.type == NL80211_IFTYPE_STATION)
1438                                 ieee80211_sta_rx_queued_ext(sdata, skb);
1439                         else
1440                                 WARN_ON(1);
1441                 } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1442                         struct ieee80211_hdr *hdr = (void *)mgmt;
1443                         /*
1444                          * So the frame isn't mgmt, but frame_control
1445                          * is at the right place anyway, of course, so
1446                          * the if statement is correct.
1447                          *
1448                          * Warn if we have other data frame types here,
1449                          * they must not get here.
1450                          */
1451                         WARN_ON(hdr->frame_control &
1452                                         cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1453                         WARN_ON(!(hdr->seq_ctrl &
1454                                         cpu_to_le16(IEEE80211_SCTL_FRAG)));
1455                         /*
1456                          * This was a fragment of a frame, received while
1457                          * a block-ack session was active. That cannot be
1458                          * right, so terminate the session.
1459                          */
1460                         mutex_lock(&local->sta_mtx);
1461                         sta = sta_info_get_bss(sdata, mgmt->sa);
1462                         if (sta) {
1463                                 u16 tid = ieee80211_get_tid(hdr);
1464
1465                                 __ieee80211_stop_rx_ba_session(
1466                                         sta, tid, WLAN_BACK_RECIPIENT,
1467                                         WLAN_REASON_QSTA_REQUIRE_SETUP,
1468                                         true);
1469                         }
1470                         mutex_unlock(&local->sta_mtx);
1471                 } else switch (sdata->vif.type) {
1472                 case NL80211_IFTYPE_STATION:
1473                         ieee80211_sta_rx_queued_mgmt(sdata, skb);
1474                         break;
1475                 case NL80211_IFTYPE_ADHOC:
1476                         ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1477                         break;
1478                 case NL80211_IFTYPE_MESH_POINT:
1479                         if (!ieee80211_vif_is_mesh(&sdata->vif))
1480                                 break;
1481                         ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1482                         break;
1483                 default:
1484                         WARN(1, "frame for unexpected interface type");
1485                         break;
1486                 }
1487
1488                 kfree_skb(skb);
1489         }
1490
1491         /* then other type-dependent work */
1492         switch (sdata->vif.type) {
1493         case NL80211_IFTYPE_STATION:
1494                 ieee80211_sta_work(sdata);
1495                 break;
1496         case NL80211_IFTYPE_ADHOC:
1497                 ieee80211_ibss_work(sdata);
1498                 break;
1499         case NL80211_IFTYPE_MESH_POINT:
1500                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1501                         break;
1502                 ieee80211_mesh_work(sdata);
1503                 break;
1504         case NL80211_IFTYPE_OCB:
1505                 ieee80211_ocb_work(sdata);
1506                 break;
1507         default:
1508                 break;
1509         }
1510 }
1511
1512 static void ieee80211_recalc_smps_work(struct work_struct *work)
1513 {
1514         struct ieee80211_sub_if_data *sdata =
1515                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1516
1517         ieee80211_recalc_smps(sdata);
1518 }
1519
1520 /*
1521  * Helper function to initialise an interface to a specific type.
1522  */
1523 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1524                                   enum nl80211_iftype type)
1525 {
1526         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1527                                                     0xff, 0xff, 0xff};
1528
1529         /* clear type-dependent union */
1530         memset(&sdata->u, 0, sizeof(sdata->u));
1531
1532         /* and set some type-dependent values */
1533         sdata->vif.type = type;
1534         sdata->vif.p2p = false;
1535         sdata->wdev.iftype = type;
1536
1537         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1538         sdata->control_port_no_encrypt = false;
1539         sdata->control_port_over_nl80211 = false;
1540         sdata->control_port_no_preauth = false;
1541         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
1542         sdata->vif.bss_conf.idle = true;
1543         sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1544
1545         sdata->noack_map = 0;
1546
1547         /* only monitor/p2p-device differ */
1548         if (sdata->dev) {
1549                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1550                 sdata->dev->type = ARPHRD_ETHER;
1551         }
1552
1553         skb_queue_head_init(&sdata->skb_queue);
1554         INIT_WORK(&sdata->work, ieee80211_iface_work);
1555         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1556         INIT_WORK(&sdata->csa_finalize_work, ieee80211_csa_finalize_work);
1557         INIT_LIST_HEAD(&sdata->assigned_chanctx_list);
1558         INIT_LIST_HEAD(&sdata->reserved_chanctx_list);
1559
1560         switch (type) {
1561         case NL80211_IFTYPE_P2P_GO:
1562                 type = NL80211_IFTYPE_AP;
1563                 sdata->vif.type = type;
1564                 sdata->vif.p2p = true;
1565                 fallthrough;
1566         case NL80211_IFTYPE_AP:
1567                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1568                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1569                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1570                 break;
1571         case NL80211_IFTYPE_P2P_CLIENT:
1572                 type = NL80211_IFTYPE_STATION;
1573                 sdata->vif.type = type;
1574                 sdata->vif.p2p = true;
1575                 fallthrough;
1576         case NL80211_IFTYPE_STATION:
1577                 sdata->vif.bss_conf.bssid = sdata->u.mgd.bssid;
1578                 ieee80211_sta_setup_sdata(sdata);
1579                 break;
1580         case NL80211_IFTYPE_OCB:
1581                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1582                 ieee80211_ocb_setup_sdata(sdata);
1583                 break;
1584         case NL80211_IFTYPE_ADHOC:
1585                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1586                 ieee80211_ibss_setup_sdata(sdata);
1587                 break;
1588         case NL80211_IFTYPE_MESH_POINT:
1589                 if (ieee80211_vif_is_mesh(&sdata->vif))
1590                         ieee80211_mesh_init_sdata(sdata);
1591                 break;
1592         case NL80211_IFTYPE_MONITOR:
1593                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1594                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1595                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1596                                       MONITOR_FLAG_OTHER_BSS;
1597                 break;
1598         case NL80211_IFTYPE_WDS:
1599                 sdata->vif.bss_conf.bssid = NULL;
1600                 break;
1601         case NL80211_IFTYPE_NAN:
1602                 idr_init(&sdata->u.nan.function_inst_ids);
1603                 spin_lock_init(&sdata->u.nan.func_lock);
1604                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1605                 break;
1606         case NL80211_IFTYPE_AP_VLAN:
1607         case NL80211_IFTYPE_P2P_DEVICE:
1608                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1609                 break;
1610         case NL80211_IFTYPE_UNSPECIFIED:
1611         case NUM_NL80211_IFTYPES:
1612                 WARN_ON(1);
1613                 break;
1614         }
1615
1616         ieee80211_debugfs_add_netdev(sdata);
1617 }
1618
1619 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1620                                            enum nl80211_iftype type)
1621 {
1622         struct ieee80211_local *local = sdata->local;
1623         int ret, err;
1624         enum nl80211_iftype internal_type = type;
1625         bool p2p = false;
1626
1627         ASSERT_RTNL();
1628
1629         if (!local->ops->change_interface)
1630                 return -EBUSY;
1631
1632         switch (sdata->vif.type) {
1633         case NL80211_IFTYPE_AP:
1634         case NL80211_IFTYPE_STATION:
1635         case NL80211_IFTYPE_ADHOC:
1636         case NL80211_IFTYPE_OCB:
1637                 /*
1638                  * Could maybe also all others here?
1639                  * Just not sure how that interacts
1640                  * with the RX/config path e.g. for
1641                  * mesh.
1642                  */
1643                 break;
1644         default:
1645                 return -EBUSY;
1646         }
1647
1648         switch (type) {
1649         case NL80211_IFTYPE_AP:
1650         case NL80211_IFTYPE_STATION:
1651         case NL80211_IFTYPE_ADHOC:
1652         case NL80211_IFTYPE_OCB:
1653                 /*
1654                  * Could probably support everything
1655                  * but WDS here (WDS do_open can fail
1656                  * under memory pressure, which this
1657                  * code isn't prepared to handle).
1658                  */
1659                 break;
1660         case NL80211_IFTYPE_P2P_CLIENT:
1661                 p2p = true;
1662                 internal_type = NL80211_IFTYPE_STATION;
1663                 break;
1664         case NL80211_IFTYPE_P2P_GO:
1665                 p2p = true;
1666                 internal_type = NL80211_IFTYPE_AP;
1667                 break;
1668         default:
1669                 return -EBUSY;
1670         }
1671
1672         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1673         if (ret)
1674                 return ret;
1675
1676         ieee80211_do_stop(sdata, false);
1677
1678         ieee80211_teardown_sdata(sdata);
1679
1680         ieee80211_set_sdata_offload_flags(sdata);
1681         ret = drv_change_interface(local, sdata, internal_type, p2p);
1682         if (ret)
1683                 type = ieee80211_vif_type_p2p(&sdata->vif);
1684
1685         /*
1686          * Ignore return value here, there's not much we can do since
1687          * the driver changed the interface type internally already.
1688          * The warnings will hopefully make driver authors fix it :-)
1689          */
1690         ieee80211_check_queues(sdata, type);
1691
1692         ieee80211_setup_sdata(sdata, type);
1693         ieee80211_set_vif_encap_ops(sdata);
1694
1695         err = ieee80211_do_open(&sdata->wdev, false);
1696         WARN(err, "type change: do_open returned %d", err);
1697
1698         return ret;
1699 }
1700
1701 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1702                              enum nl80211_iftype type)
1703 {
1704         int ret;
1705
1706         ASSERT_RTNL();
1707
1708         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1709                 return 0;
1710
1711         if (ieee80211_sdata_running(sdata)) {
1712                 ret = ieee80211_runtime_change_iftype(sdata, type);
1713                 if (ret)
1714                         return ret;
1715         } else {
1716                 /* Purge and reset type-dependent state. */
1717                 ieee80211_teardown_sdata(sdata);
1718                 ieee80211_setup_sdata(sdata, type);
1719         }
1720
1721         /* reset some values that shouldn't be kept across type changes */
1722         if (type == NL80211_IFTYPE_STATION)
1723                 sdata->u.mgd.use_4addr = false;
1724
1725         return 0;
1726 }
1727
1728 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1729                                        u8 *perm_addr, enum nl80211_iftype type)
1730 {
1731         struct ieee80211_sub_if_data *sdata;
1732         u64 mask, start, addr, val, inc;
1733         u8 *m;
1734         u8 tmp_addr[ETH_ALEN];
1735         int i;
1736
1737         /* default ... something at least */
1738         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1739
1740         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1741             local->hw.wiphy->n_addresses <= 1)
1742                 return;
1743
1744         mutex_lock(&local->iflist_mtx);
1745
1746         switch (type) {
1747         case NL80211_IFTYPE_MONITOR:
1748                 /* doesn't matter */
1749                 break;
1750         case NL80211_IFTYPE_WDS:
1751         case NL80211_IFTYPE_AP_VLAN:
1752                 /* match up with an AP interface */
1753                 list_for_each_entry(sdata, &local->interfaces, list) {
1754                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1755                                 continue;
1756                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1757                         break;
1758                 }
1759                 /* keep default if no AP interface present */
1760                 break;
1761         case NL80211_IFTYPE_P2P_CLIENT:
1762         case NL80211_IFTYPE_P2P_GO:
1763                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1764                         list_for_each_entry(sdata, &local->interfaces, list) {
1765                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1766                                         continue;
1767                                 if (!ieee80211_sdata_running(sdata))
1768                                         continue;
1769                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1770                                 goto out_unlock;
1771                         }
1772                 }
1773                 fallthrough;
1774         default:
1775                 /* assign a new address if possible -- try n_addresses first */
1776                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1777                         bool used = false;
1778
1779                         list_for_each_entry(sdata, &local->interfaces, list) {
1780                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1781                                                      sdata->vif.addr)) {
1782                                         used = true;
1783                                         break;
1784                                 }
1785                         }
1786
1787                         if (!used) {
1788                                 memcpy(perm_addr,
1789                                        local->hw.wiphy->addresses[i].addr,
1790                                        ETH_ALEN);
1791                                 break;
1792                         }
1793                 }
1794
1795                 /* try mask if available */
1796                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1797                         break;
1798
1799                 m = local->hw.wiphy->addr_mask;
1800                 mask =  ((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                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1805                         /* not a contiguous mask ... not handled now! */
1806                         pr_info("not contiguous\n");
1807                         break;
1808                 }
1809
1810                 /*
1811                  * Pick address of existing interface in case user changed
1812                  * MAC address manually, default to perm_addr.
1813                  */
1814                 m = local->hw.wiphy->perm_addr;
1815                 list_for_each_entry(sdata, &local->interfaces, list) {
1816                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1817                                 continue;
1818                         m = sdata->vif.addr;
1819                         break;
1820                 }
1821                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1822                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1823                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1824
1825                 inc = 1ULL<<__ffs64(mask);
1826                 val = (start & mask);
1827                 addr = (start & ~mask) | (val & mask);
1828                 do {
1829                         bool used = false;
1830
1831                         tmp_addr[5] = addr >> 0*8;
1832                         tmp_addr[4] = addr >> 1*8;
1833                         tmp_addr[3] = addr >> 2*8;
1834                         tmp_addr[2] = addr >> 3*8;
1835                         tmp_addr[1] = addr >> 4*8;
1836                         tmp_addr[0] = addr >> 5*8;
1837
1838                         val += inc;
1839
1840                         list_for_each_entry(sdata, &local->interfaces, list) {
1841                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
1842                                         used = true;
1843                                         break;
1844                                 }
1845                         }
1846
1847                         if (!used) {
1848                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
1849                                 break;
1850                         }
1851                         addr = (start & ~mask) | (val & mask);
1852                 } while (addr != start);
1853
1854                 break;
1855         }
1856
1857  out_unlock:
1858         mutex_unlock(&local->iflist_mtx);
1859 }
1860
1861 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
1862                      unsigned char name_assign_type,
1863                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
1864                      struct vif_params *params)
1865 {
1866         struct net_device *ndev = NULL;
1867         struct ieee80211_sub_if_data *sdata = NULL;
1868         struct txq_info *txqi;
1869         void (*if_setup)(struct net_device *dev);
1870         int ret, i;
1871         int txqs = 1;
1872
1873         ASSERT_RTNL();
1874
1875         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
1876                 struct wireless_dev *wdev;
1877
1878                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
1879                                 GFP_KERNEL);
1880                 if (!sdata)
1881                         return -ENOMEM;
1882                 wdev = &sdata->wdev;
1883
1884                 sdata->dev = NULL;
1885                 strlcpy(sdata->name, name, IFNAMSIZ);
1886                 ieee80211_assign_perm_addr(local, wdev->address, type);
1887                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
1888         } else {
1889                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
1890                                  sizeof(void *));
1891                 int txq_size = 0;
1892
1893                 if (local->ops->wake_tx_queue &&
1894                     type != NL80211_IFTYPE_AP_VLAN &&
1895                     (type != NL80211_IFTYPE_MONITOR ||
1896                      (params->flags & MONITOR_FLAG_ACTIVE)))
1897                         txq_size += sizeof(struct txq_info) +
1898                                     local->hw.txq_data_size;
1899
1900                 if (local->ops->wake_tx_queue) {
1901                         if_setup = ieee80211_if_setup_no_queue;
1902                 } else {
1903                         if_setup = ieee80211_if_setup;
1904                         if (local->hw.queues >= IEEE80211_NUM_ACS)
1905                                 txqs = IEEE80211_NUM_ACS;
1906                 }
1907
1908                 ndev = alloc_netdev_mqs(size + txq_size,
1909                                         name, name_assign_type,
1910                                         if_setup, txqs, 1);
1911                 if (!ndev)
1912                         return -ENOMEM;
1913
1914                 if (!local->ops->wake_tx_queue && local->hw.wiphy->tx_queue_len)
1915                         ndev->tx_queue_len = local->hw.wiphy->tx_queue_len;
1916
1917                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
1918
1919                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
1920                 if (!ndev->tstats) {
1921                         free_netdev(ndev);
1922                         return -ENOMEM;
1923                 }
1924
1925                 ndev->needed_headroom = local->tx_headroom +
1926                                         4*6 /* four MAC addresses */
1927                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
1928                                         + 6 /* mesh */
1929                                         + 8 /* rfc1042/bridge tunnel */
1930                                         - ETH_HLEN /* ethernet hard_header_len */
1931                                         + IEEE80211_ENCRYPT_HEADROOM;
1932                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
1933
1934                 ret = dev_alloc_name(ndev, ndev->name);
1935                 if (ret < 0) {
1936                         ieee80211_if_free(ndev);
1937                         free_netdev(ndev);
1938                         return ret;
1939                 }
1940
1941                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
1942                 if (is_valid_ether_addr(params->macaddr))
1943                         memcpy(ndev->dev_addr, params->macaddr, ETH_ALEN);
1944                 else
1945                         memcpy(ndev->dev_addr, ndev->perm_addr, ETH_ALEN);
1946                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
1947
1948                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
1949                 sdata = netdev_priv(ndev);
1950                 ndev->ieee80211_ptr = &sdata->wdev;
1951                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
1952                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
1953
1954                 if (txq_size) {
1955                         txqi = netdev_priv(ndev) + size;
1956                         ieee80211_txq_init(sdata, NULL, txqi, 0);
1957                 }
1958
1959                 sdata->dev = ndev;
1960         }
1961
1962         /* initialise type-independent data */
1963         sdata->wdev.wiphy = local->hw.wiphy;
1964         sdata->local = local;
1965
1966         for (i = 0; i < IEEE80211_FRAGMENT_MAX; i++)
1967                 skb_queue_head_init(&sdata->fragments[i].skb_list);
1968
1969         INIT_LIST_HEAD(&sdata->key_list);
1970
1971         INIT_DELAYED_WORK(&sdata->dfs_cac_timer_work,
1972                           ieee80211_dfs_cac_timer_work);
1973         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
1974                           ieee80211_delayed_tailroom_dec);
1975
1976         for (i = 0; i < NUM_NL80211_BANDS; i++) {
1977                 struct ieee80211_supported_band *sband;
1978                 sband = local->hw.wiphy->bands[i];
1979                 sdata->rc_rateidx_mask[i] =
1980                         sband ? (1 << sband->n_bitrates) - 1 : 0;
1981                 if (sband) {
1982                         __le16 cap;
1983                         u16 *vht_rate_mask;
1984
1985                         memcpy(sdata->rc_rateidx_mcs_mask[i],
1986                                sband->ht_cap.mcs.rx_mask,
1987                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1988
1989                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
1990                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
1991                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
1992                 } else {
1993                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
1994                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
1995                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
1996                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
1997                 }
1998         }
1999
2000         ieee80211_set_default_queues(sdata);
2001
2002         sdata->ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2003         sdata->user_power_level = local->user_power_level;
2004
2005         sdata->encrypt_headroom = IEEE80211_ENCRYPT_HEADROOM;
2006
2007         /* setup type-dependent data */
2008         ieee80211_setup_sdata(sdata, type);
2009
2010         if (ndev) {
2011                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
2012                 if (type == NL80211_IFTYPE_STATION)
2013                         sdata->u.mgd.use_4addr = params->use_4addr;
2014
2015                 ndev->features |= local->hw.netdev_features;
2016                 ndev->hw_features |= ndev->features &
2017                                         MAC80211_SUPPORTED_FEATURES_TX;
2018
2019                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
2020
2021                 /* MTU range: 256 - 2304 */
2022                 ndev->min_mtu = 256;
2023                 ndev->max_mtu = local->hw.max_mtu;
2024
2025                 ret = register_netdevice(ndev);
2026                 if (ret) {
2027                         free_netdev(ndev);
2028                         return ret;
2029                 }
2030         }
2031
2032         mutex_lock(&local->iflist_mtx);
2033         list_add_tail_rcu(&sdata->list, &local->interfaces);
2034         mutex_unlock(&local->iflist_mtx);
2035
2036         if (new_wdev)
2037                 *new_wdev = &sdata->wdev;
2038
2039         return 0;
2040 }
2041
2042 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2043 {
2044         ASSERT_RTNL();
2045
2046         mutex_lock(&sdata->local->iflist_mtx);
2047         list_del_rcu(&sdata->list);
2048         mutex_unlock(&sdata->local->iflist_mtx);
2049
2050         if (sdata->vif.txq)
2051                 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2052
2053         synchronize_rcu();
2054
2055         if (sdata->dev) {
2056                 unregister_netdevice(sdata->dev);
2057         } else {
2058                 cfg80211_unregister_wdev(&sdata->wdev);
2059                 ieee80211_teardown_sdata(sdata);
2060                 kfree(sdata);
2061         }
2062 }
2063
2064 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2065 {
2066         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2067                 return;
2068         ieee80211_do_stop(sdata, true);
2069 }
2070
2071 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2072 {
2073         struct ieee80211_sub_if_data *sdata, *tmp;
2074         LIST_HEAD(unreg_list);
2075         LIST_HEAD(wdev_list);
2076
2077         ASSERT_RTNL();
2078
2079         /* Before destroying the interfaces, make sure they're all stopped so
2080          * that the hardware is stopped. Otherwise, the driver might still be
2081          * iterating the interfaces during the shutdown, e.g. from a worker
2082          * or from RX processing or similar, and if it does so (using atomic
2083          * iteration) while we're manipulating the list, the iteration will
2084          * crash.
2085          *
2086          * After this, the hardware should be stopped and the driver should
2087          * have stopped all of its activities, so that we can do RCU-unaware
2088          * manipulations of the interface list below.
2089          */
2090         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2091
2092         WARN(local->open_count, "%s: open count remains %d\n",
2093              wiphy_name(local->hw.wiphy), local->open_count);
2094
2095         ieee80211_txq_teardown_flows(local);
2096
2097         mutex_lock(&local->iflist_mtx);
2098         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
2099                 list_del(&sdata->list);
2100
2101                 if (sdata->dev)
2102                         unregister_netdevice_queue(sdata->dev, &unreg_list);
2103                 else
2104                         list_add(&sdata->list, &wdev_list);
2105         }
2106         mutex_unlock(&local->iflist_mtx);
2107         unregister_netdevice_many(&unreg_list);
2108
2109         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2110                 list_del(&sdata->list);
2111                 cfg80211_unregister_wdev(&sdata->wdev);
2112                 kfree(sdata);
2113         }
2114 }
2115
2116 static int netdev_notify(struct notifier_block *nb,
2117                          unsigned long state, void *ptr)
2118 {
2119         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2120         struct ieee80211_sub_if_data *sdata;
2121
2122         if (state != NETDEV_CHANGENAME)
2123                 return NOTIFY_DONE;
2124
2125         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2126                 return NOTIFY_DONE;
2127
2128         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2129                 return NOTIFY_DONE;
2130
2131         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2132         memcpy(sdata->name, dev->name, IFNAMSIZ);
2133         ieee80211_debugfs_rename_netdev(sdata);
2134
2135         return NOTIFY_OK;
2136 }
2137
2138 static struct notifier_block mac80211_netdev_notifier = {
2139         .notifier_call = netdev_notify,
2140 };
2141
2142 int ieee80211_iface_init(void)
2143 {
2144         return register_netdevice_notifier(&mac80211_netdev_notifier);
2145 }
2146
2147 void ieee80211_iface_exit(void)
2148 {
2149         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2150 }
2151
2152 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2153 {
2154         if (sdata->vif.type == NL80211_IFTYPE_AP)
2155                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2156         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2157                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2158 }
2159
2160 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2161 {
2162         if (sdata->vif.type == NL80211_IFTYPE_AP)
2163                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2164         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2165                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2166 }