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 <[email protected]>
   8  * Copyright 2008, Johannes Berg <[email protected]>
   9  * Copyright 2013-2014  Intel Mobile Communications GmbH
  10  * Copyright (c) 2016        Intel Deutschland GmbH
  11  * Copyright (C) 2018-2022 Intel Corporation
  12  */
  13 #include <linux/slab.h>
  14 #include <linux/kernel.h>
  15 #include <linux/if_arp.h>
  16 #include <linux/netdevice.h>
  17 #include <linux/rtnetlink.h>
  18 #include <linux/kcov.h>
  19 #include <net/mac80211.h>
  20 #include <net/ieee80211_radiotap.h>
  21 #include "ieee80211_i.h"
  22 #include "sta_info.h"
  23 #include "debugfs_netdev.h"
  24 #include "mesh.h"
  25 #include "led.h"
  26 #include "driver-ops.h"
  27 #include "wme.h"
  28 #include "rate.h"
  29
  30 /**
  31  * DOC: Interface list locking
  32  *
  33  * The interface list in each struct ieee80211_local is protected
  34  * three-fold:
  35  *
  36  * (1) modifications may only be done under the RTNL
  37  * (2) modifications and readers are protected against each other by
  38  *     the iflist_mtx.
  39  * (3) modifications are done in an RCU manner so atomic readers
  40  *     can traverse the list in RCU-safe blocks.
  41  *
  42  * As a consequence, reads (traversals) of the list can be protected
  43  * by either the RTNL, the iflist_mtx or RCU.
  44  */
  45
  46 static void ieee80211_iface_work(struct work_struct *work);
  47
  48 bool __ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata)
  49 {
  50         struct ieee80211_chanctx_conf *chanctx_conf;
  51         int power;
  52
  53         rcu_read_lock();
  54         chanctx_conf = rcu_dereference(sdata->vif.bss_conf.chanctx_conf);
  55         if (!chanctx_conf) {
  56                 rcu_read_unlock();
  57                 return false;
  58         }
  59
  60         power = ieee80211_chandef_max_power(&chanctx_conf->def);
  61         rcu_read_unlock();
  62
  63         if (sdata->deflink.user_power_level != IEEE80211_UNSET_POWER_LEVEL)
  64                 power = min(power, sdata->deflink.user_power_level);
  65
  66         if (sdata->deflink.ap_power_level != IEEE80211_UNSET_POWER_LEVEL)
  67                 power = min(power, sdata->deflink.ap_power_level);
  68
  69         if (power != sdata->vif.bss_conf.txpower) {
  70                 sdata->vif.bss_conf.txpower = power;
  71                 ieee80211_hw_config(sdata->local, 0);
  72                 return true;
  73         }
  74
  75         return false;
  76 }
  77
  78 void ieee80211_recalc_txpower(struct ieee80211_sub_if_data *sdata,
  79                               bool update_bss)
  80 {
  81         if (__ieee80211_recalc_txpower(sdata) ||
  82             (update_bss && ieee80211_sdata_running(sdata)))
  83                 ieee80211_link_info_change_notify(sdata, &sdata->deflink,
  84                                                   BSS_CHANGED_TXPOWER);
  85 }
  86
  87 static u32 __ieee80211_idle_off(struct ieee80211_local *local)
  88 {
  89         if (!(local->hw.conf.flags & IEEE80211_CONF_IDLE))
  90                 return 0;
  91
  92         local->hw.conf.flags &= ~IEEE80211_CONF_IDLE;
  93         return IEEE80211_CONF_CHANGE_IDLE;
  94 }
  95
  96 static u32 __ieee80211_idle_on(struct ieee80211_local *local)
  97 {
  98         if (local->hw.conf.flags & IEEE80211_CONF_IDLE)
  99                 return 0;
 100
 101         ieee80211_flush_queues(local, NULL, false);
 102
 103         local->hw.conf.flags |= IEEE80211_CONF_IDLE;
 104         return IEEE80211_CONF_CHANGE_IDLE;
 105 }
 106
 107 static u32 __ieee80211_recalc_idle(struct ieee80211_local *local,
 108                                    bool force_active)
 109 {
 110         bool working, scanning, active;
 111         unsigned int led_trig_start = 0, led_trig_stop = 0;
 112
 113         lockdep_assert_held(&local->mtx);
 114
 115         active = force_active ||
 116                  !list_empty(&local->chanctx_list) ||
 117                  local->monitors;
 118
 119         working = !local->ops->remain_on_channel &&
 120                   !list_empty(&local->roc_list);
 121
 122         scanning = test_bit(SCAN_SW_SCANNING, &local->scanning) ||
 123                    test_bit(SCAN_ONCHANNEL_SCANNING, &local->scanning);
 124
 125         if (working || scanning)
 126                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 127         else
 128                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_WORK;
 129
 130         if (active)
 131                 led_trig_start |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 132         else
 133                 led_trig_stop |= IEEE80211_TPT_LEDTRIG_FL_CONNECTED;
 134
 135         ieee80211_mod_tpt_led_trig(local, led_trig_start, led_trig_stop);
 136
 137         if (working || scanning || active)
 138                 return __ieee80211_idle_off(local);
 139         return __ieee80211_idle_on(local);
 140 }
 141
 142 u32 ieee80211_idle_off(struct ieee80211_local *local)
 143 {
 144         return __ieee80211_recalc_idle(local, true);
 145 }
 146
 147 void ieee80211_recalc_idle(struct ieee80211_local *local)
 148 {
 149         u32 change = __ieee80211_recalc_idle(local, false);
 150         if (change)
 151                 ieee80211_hw_config(local, change);
 152 }
 153
 154 static int ieee80211_verify_mac(struct ieee80211_sub_if_data *sdata, u8 *addr,
 155                                 bool check_dup)
 156 {
 157         struct ieee80211_local *local = sdata->local;
 158         struct ieee80211_sub_if_data *iter;
 159         u64 new, mask, tmp;
 160         u8 *m;
 161         int ret = 0;
 162
 163         if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
 164                 return 0;
 165
 166         m = addr;
 167         new =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 168                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 169                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 170
 171         m = local->hw.wiphy->addr_mask;
 172         mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 173                 ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 174                 ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 175
 176         if (!check_dup)
 177                 return ret;
 178
 179         mutex_lock(&local->iflist_mtx);
 180         list_for_each_entry(iter, &local->interfaces, list) {
 181                 if (iter == sdata)
 182                         continue;
 183
 184                 if (iter->vif.type == NL80211_IFTYPE_MONITOR &&
 185                     !(iter->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 186                         continue;
 187
 188                 m = iter->vif.addr;
 189                 tmp =   ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
 190                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
 191                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
 192
 193                 if ((new & ~mask) != (tmp & ~mask)) {
 194                         ret = -EINVAL;
 195                         break;
 196                 }
 197         }
 198         mutex_unlock(&local->iflist_mtx);
 199
 200         return ret;
 201 }
 202
 203 static int ieee80211_can_powered_addr_change(struct ieee80211_sub_if_data *sdata)
 204 {
 205         struct ieee80211_roc_work *roc;
 206         struct ieee80211_local *local = sdata->local;
 207         struct ieee80211_sub_if_data *scan_sdata;
 208         int ret = 0;
 209
 210         /* To be the most flexible here we want to only limit changing the
 211          * address if the specific interface is doing offchannel work or
 212          * scanning.
 213          */
 214         if (netif_carrier_ok(sdata->dev))
 215                 return -EBUSY;
 216
 217         mutex_lock(&local->mtx);
 218
 219         /* First check no ROC work is happening on this iface */
 220         list_for_each_entry(roc, &local->roc_list, list) {
 221                 if (roc->sdata != sdata)
 222                         continue;
 223
 224                 if (roc->started) {
 225                         ret = -EBUSY;
 226                         goto unlock;
 227                 }
 228         }
 229
 230         /* And if this iface is scanning */
 231         if (local->scanning) {
 232                 scan_sdata = rcu_dereference_protected(local->scan_sdata,
 233                                                        lockdep_is_held(&local->mtx));
 234                 if (sdata == scan_sdata)
 235                         ret = -EBUSY;
 236         }
 237
 238         switch (sdata->vif.type) {
 239         case NL80211_IFTYPE_STATION:
 240         case NL80211_IFTYPE_P2P_CLIENT:
 241                 /* More interface types could be added here but changing the
 242                  * address while powered makes the most sense in client modes.
 243                  */
 244                 break;
 245         default:
 246                 ret = -EOPNOTSUPP;
 247         }
 248
 249 unlock:
 250         mutex_unlock(&local->mtx);
 251         return ret;
 252 }
 253
 254 static int ieee80211_change_mac(struct net_device *dev, void *addr)
 255 {
 256         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 257         struct ieee80211_local *local = sdata->local;
 258         struct sockaddr *sa = addr;
 259         bool check_dup = true;
 260         bool live = false;
 261         int ret;
 262
 263         if (ieee80211_sdata_running(sdata)) {
 264                 ret = ieee80211_can_powered_addr_change(sdata);
 265                 if (ret)
 266                         return ret;
 267
 268                 live = true;
 269         }
 270
 271         if (sdata->vif.type == NL80211_IFTYPE_MONITOR &&
 272             !(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 273                 check_dup = false;
 274
 275         ret = ieee80211_verify_mac(sdata, sa->sa_data, check_dup);
 276         if (ret)
 277                 return ret;
 278
 279         if (live)
 280                 drv_remove_interface(local, sdata);
 281         ret = eth_mac_addr(dev, sa);
 282
 283         if (ret == 0) {
 284                 memcpy(sdata->vif.addr, sa->sa_data, ETH_ALEN);
 285                 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
 286         }
 287
 288         /* Regardless of eth_mac_addr() return we still want to add the
 289          * interface back. This should not fail...
 290          */
 291         if (live)
 292                 WARN_ON(drv_add_interface(local, sdata));
 293
 294         return ret;
 295 }
 296
 297 static inline int identical_mac_addr_allowed(int type1, int type2)
 298 {
 299         return type1 == NL80211_IFTYPE_MONITOR ||
 300                 type2 == NL80211_IFTYPE_MONITOR ||
 301                 type1 == NL80211_IFTYPE_P2P_DEVICE ||
 302                 type2 == NL80211_IFTYPE_P2P_DEVICE ||
 303                 (type1 == NL80211_IFTYPE_AP && type2 == NL80211_IFTYPE_AP_VLAN) ||
 304                 (type1 == NL80211_IFTYPE_AP_VLAN &&
 305                         (type2 == NL80211_IFTYPE_AP ||
 306                          type2 == NL80211_IFTYPE_AP_VLAN));
 307 }
 308
 309 static int ieee80211_check_concurrent_iface(struct ieee80211_sub_if_data *sdata,
 310                                             enum nl80211_iftype iftype)
 311 {
 312         struct ieee80211_local *local = sdata->local;
 313         struct ieee80211_sub_if_data *nsdata;
 314         int ret;
 315
 316         ASSERT_RTNL();
 317
 318         /* we hold the RTNL here so can safely walk the list */
 319         list_for_each_entry(nsdata, &local->interfaces, list) {
 320                 if (nsdata != sdata && ieee80211_sdata_running(nsdata)) {
 321                         /*
 322                          * Only OCB and monitor mode may coexist
 323                          */
 324                         if ((sdata->vif.type == NL80211_IFTYPE_OCB &&
 325                              nsdata->vif.type != NL80211_IFTYPE_MONITOR) ||
 326                             (sdata->vif.type != NL80211_IFTYPE_MONITOR &&
 327                              nsdata->vif.type == NL80211_IFTYPE_OCB))
 328                                 return -EBUSY;
 329
 330                         /*
 331                          * Allow only a single IBSS interface to be up at any
 332                          * time. This is restricted because beacon distribution
 333                          * cannot work properly if both are in the same IBSS.
 334                          *
 335                          * To remove this restriction we'd have to disallow them
 336                          * from setting the same SSID on different IBSS interfaces
 337                          * belonging to the same hardware. Then, however, we're
 338                          * faced with having to adopt two different TSF timers...
 339                          */
 340                         if (iftype == NL80211_IFTYPE_ADHOC &&
 341                             nsdata->vif.type == NL80211_IFTYPE_ADHOC)
 342                                 return -EBUSY;
 343                         /*
 344                          * will not add another interface while any channel
 345                          * switch is active.
 346                          */
 347                         if (nsdata->vif.bss_conf.csa_active)
 348                                 return -EBUSY;
 349
 350                         /*
 351                          * The remaining checks are only performed for interfaces
 352                          * with the same MAC address.
 353                          */
 354                         if (!ether_addr_equal(sdata->vif.addr,
 355                                               nsdata->vif.addr))
 356                                 continue;
 357
 358                         /*
 359                          * check whether it may have the same address
 360                          */
 361                         if (!identical_mac_addr_allowed(iftype,
 362                                                         nsdata->vif.type))
 363                                 return -ENOTUNIQ;
 364
 365                         /* No support for VLAN with MLO yet */
 366                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 367                             sdata->wdev.use_4addr &&
 368                             nsdata->vif.type == NL80211_IFTYPE_AP &&
 369                             nsdata->vif.valid_links)
 370                                 return -EOPNOTSUPP;
 371
 372                         /*
 373                          * can only add VLANs to enabled APs
 374                          */
 375                         if (iftype == NL80211_IFTYPE_AP_VLAN &&
 376                             nsdata->vif.type == NL80211_IFTYPE_AP)
 377                                 sdata->bss = &nsdata->u.ap;
 378                 }
 379         }
 380
 381         mutex_lock(&local->chanctx_mtx);
 382         ret = ieee80211_check_combinations(sdata, NULL, 0, 0);
 383         mutex_unlock(&local->chanctx_mtx);
 384         return ret;
 385 }
 386
 387 static int ieee80211_check_queues(struct ieee80211_sub_if_data *sdata,
 388                                   enum nl80211_iftype iftype)
 389 {
 390         int n_queues = sdata->local->hw.queues;
 391         int i;
 392
 393         if (iftype == NL80211_IFTYPE_NAN)
 394                 return 0;
 395
 396         if (iftype != NL80211_IFTYPE_P2P_DEVICE) {
 397                 for (i = 0; i < IEEE80211_NUM_ACS; i++) {
 398                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] ==
 399                                          IEEE80211_INVAL_HW_QUEUE))
 400                                 return -EINVAL;
 401                         if (WARN_ON_ONCE(sdata->vif.hw_queue[i] >=
 402                                          n_queues))
 403                                 return -EINVAL;
 404                 }
 405         }
 406
 407         if ((iftype != NL80211_IFTYPE_AP &&
 408              iftype != NL80211_IFTYPE_P2P_GO &&
 409              iftype != NL80211_IFTYPE_MESH_POINT) ||
 410             !ieee80211_hw_check(&sdata->local->hw, QUEUE_CONTROL)) {
 411                 sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
 412                 return 0;
 413         }
 414
 415         if (WARN_ON_ONCE(sdata->vif.cab_queue == IEEE80211_INVAL_HW_QUEUE))
 416                 return -EINVAL;
 417
 418         if (WARN_ON_ONCE(sdata->vif.cab_queue >= n_queues))
 419                 return -EINVAL;
 420
 421         return 0;
 422 }
 423
 424 static int ieee80211_open(struct net_device *dev)
 425 {
 426         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 427         int err;
 428
 429         /* fail early if user set an invalid address */
 430         if (!is_valid_ether_addr(dev->dev_addr))
 431                 return -EADDRNOTAVAIL;
 432
 433         err = ieee80211_check_concurrent_iface(sdata, sdata->vif.type);
 434         if (err)
 435                 return err;
 436
 437         wiphy_lock(sdata->local->hw.wiphy);
 438         err = ieee80211_do_open(&sdata->wdev, true);
 439         wiphy_unlock(sdata->local->hw.wiphy);
 440
 441         return err;
 442 }
 443
 444 static void ieee80211_do_stop(struct ieee80211_sub_if_data *sdata, bool going_down)
 445 {
 446         struct ieee80211_local *local = sdata->local;
 447         unsigned long flags;
 448         struct sk_buff *skb, *tmp;
 449         u32 hw_reconf_flags = 0;
 450         int i, flushed;
 451         struct ps_data *ps;
 452         struct cfg80211_chan_def chandef;
 453         bool cancel_scan;
 454         struct cfg80211_nan_func *func;
 455
 456         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
 457         synchronize_rcu(); /* flush _ieee80211_wake_txqs() */
 458
 459         cancel_scan = rcu_access_pointer(local->scan_sdata) == sdata;
 460         if (cancel_scan)
 461                 ieee80211_scan_cancel(local);
 462
 463         ieee80211_roc_purge(local, sdata);
 464
 465         switch (sdata->vif.type) {
 466         case NL80211_IFTYPE_STATION:
 467                 ieee80211_mgd_stop(sdata);
 468                 break;
 469         case NL80211_IFTYPE_ADHOC:
 470                 ieee80211_ibss_stop(sdata);
 471                 break;
 472         case NL80211_IFTYPE_MONITOR:
 473                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
 474                         break;
 475                 list_del_rcu(&sdata->u.mntr.list);
 476                 break;
 477         default:
 478                 break;
 479         }
 480
 481         /*
 482          * Remove all stations associated with this interface.
 483          *
 484          * This must be done before calling ops->remove_interface()
 485          * because otherwise we can later invoke ops->sta_notify()
 486          * whenever the STAs are removed, and that invalidates driver
 487          * assumptions about always getting a vif pointer that is valid
 488          * (because if we remove a STA after ops->remove_interface()
 489          * the driver will have removed the vif info already!)
 490          *
 491          * For AP_VLANs stations may exist since there's nothing else that
 492          * would have removed them, but in other modes there shouldn't
 493          * be any stations.
 494          */
 495         flushed = sta_info_flush(sdata);
 496         WARN_ON_ONCE(sdata->vif.type != NL80211_IFTYPE_AP_VLAN && flushed > 0);
 497
 498         /* don't count this interface for allmulti while it is down */
 499         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
 500                 atomic_dec(&local->iff_allmultis);
 501
 502         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 503                 local->fif_pspoll--;
 504                 local->fif_probe_req--;
 505         } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
 506                 local->fif_probe_req--;
 507         }
 508
 509         if (sdata->dev) {
 510                 netif_addr_lock_bh(sdata->dev);
 511                 spin_lock_bh(&local->filter_lock);
 512                 __hw_addr_unsync(&local->mc_list, &sdata->dev->mc,
 513                                  sdata->dev->addr_len);
 514                 spin_unlock_bh(&local->filter_lock);
 515                 netif_addr_unlock_bh(sdata->dev);
 516         }
 517
 518         del_timer_sync(&local->dynamic_ps_timer);
 519         cancel_work_sync(&local->dynamic_ps_enable_work);
 520
 521         cancel_work_sync(&sdata->recalc_smps);
 522
 523         sdata_lock(sdata);
 524         WARN(sdata->vif.valid_links,
 525              "destroying interface with valid links 0x%04x\n",
 526              sdata->vif.valid_links);
 527
 528         mutex_lock(&local->mtx);
 529         sdata->vif.bss_conf.csa_active = false;
 530         if (sdata->vif.type == NL80211_IFTYPE_STATION)
 531                 sdata->deflink.u.mgd.csa_waiting_bcn = false;
 532         if (sdata->deflink.csa_block_tx) {
 533                 ieee80211_wake_vif_queues(local, sdata,
 534                                           IEEE80211_QUEUE_STOP_REASON_CSA);
 535                 sdata->deflink.csa_block_tx = false;
 536         }
 537         mutex_unlock(&local->mtx);
 538         sdata_unlock(sdata);
 539
 540         cancel_work_sync(&sdata->deflink.csa_finalize_work);
 541         cancel_work_sync(&sdata->deflink.color_change_finalize_work);
 542
 543         cancel_delayed_work_sync(&sdata->deflink.dfs_cac_timer_work);
 544
 545         if (sdata->wdev.cac_started) {
 546                 chandef = sdata->vif.bss_conf.chandef;
 547                 WARN_ON(local->suspended);
 548                 mutex_lock(&local->mtx);
 549                 ieee80211_link_release_channel(&sdata->deflink);
 550                 mutex_unlock(&local->mtx);
 551                 cfg80211_cac_event(sdata->dev, &chandef,
 552                                    NL80211_RADAR_CAC_ABORTED,
 553                                    GFP_KERNEL);
 554         }
 555
 556         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 557                 WARN_ON(!list_empty(&sdata->u.ap.vlans));
 558         } else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 559                 /* remove all packets in parent bc_buf pointing to this dev */
 560                 ps = &sdata->bss->ps;
 561
 562                 spin_lock_irqsave(&ps->bc_buf.lock, flags);
 563                 skb_queue_walk_safe(&ps->bc_buf, skb, tmp) {
 564                         if (skb->dev == sdata->dev) {
 565                                 __skb_unlink(skb, &ps->bc_buf);
 566                                 local->total_ps_buffered--;
 567                                 ieee80211_free_txskb(&local->hw, skb);
 568                         }
 569                 }
 570                 spin_unlock_irqrestore(&ps->bc_buf.lock, flags);
 571         }
 572
 573         if (going_down)
 574                 local->open_count--;
 575
 576         switch (sdata->vif.type) {
 577         case NL80211_IFTYPE_AP_VLAN:
 578                 mutex_lock(&local->mtx);
 579                 list_del(&sdata->u.vlan.list);
 580                 mutex_unlock(&local->mtx);
 581                 RCU_INIT_POINTER(sdata->vif.bss_conf.chanctx_conf, NULL);
 582                 /* see comment in the default case below */
 583                 ieee80211_free_keys(sdata, true);
 584                 /* no need to tell driver */
 585                 break;
 586         case NL80211_IFTYPE_MONITOR:
 587                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
 588                         local->cooked_mntrs--;
 589                         break;
 590                 }
 591
 592                 local->monitors--;
 593                 if (local->monitors == 0) {
 594                         local->hw.conf.flags &= ~IEEE80211_CONF_MONITOR;
 595                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
 596                 }
 597
 598                 ieee80211_adjust_monitor_flags(sdata, -1);
 599                 break;
 600         case NL80211_IFTYPE_NAN:
 601                 /* clean all the functions */
 602                 spin_lock_bh(&sdata->u.nan.func_lock);
 603
 604                 idr_for_each_entry(&sdata->u.nan.function_inst_ids, func, i) {
 605                         idr_remove(&sdata->u.nan.function_inst_ids, i);
 606                         cfg80211_free_nan_func(func);
 607                 }
 608                 idr_destroy(&sdata->u.nan.function_inst_ids);
 609
 610                 spin_unlock_bh(&sdata->u.nan.func_lock);
 611                 break;
 612         case NL80211_IFTYPE_P2P_DEVICE:
 613                 /* relies on synchronize_rcu() below */
 614                 RCU_INIT_POINTER(local->p2p_sdata, NULL);
 615                 fallthrough;
 616         default:
 617                 cancel_work_sync(&sdata->work);
 618                 /*
 619                  * When we get here, the interface is marked down.
 620                  * Free the remaining keys, if there are any
 621                  * (which can happen in AP mode if userspace sets
 622                  * keys before the interface is operating)
 623                  *
 624                  * Force the key freeing to always synchronize_net()
 625                  * to wait for the RX path in case it is using this
 626                  * interface enqueuing frames at this very time on
 627                  * another CPU.
 628                  */
 629                 ieee80211_free_keys(sdata, true);
 630                 skb_queue_purge(&sdata->skb_queue);
 631                 skb_queue_purge(&sdata->status_queue);
 632         }
 633
 634         spin_lock_irqsave(&local->queue_stop_reason_lock, flags);
 635         for (i = 0; i < IEEE80211_MAX_QUEUES; i++) {
 636                 skb_queue_walk_safe(&local->pending[i], skb, tmp) {
 637                         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 638                         if (info->control.vif == &sdata->vif) {
 639                                 __skb_unlink(skb, &local->pending[i]);
 640                                 ieee80211_free_txskb(&local->hw, skb);
 641                         }
 642                 }
 643         }
 644         spin_unlock_irqrestore(&local->queue_stop_reason_lock, flags);
 645
 646         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
 647                 ieee80211_txq_remove_vlan(local, sdata);
 648
 649         sdata->bss = NULL;
 650
 651         if (local->open_count == 0)
 652                 ieee80211_clear_tx_pending(local);
 653
 654         sdata->vif.bss_conf.beacon_int = 0;
 655
 656         /*
 657          * If the interface goes down while suspended, presumably because
 658          * the device was unplugged and that happens before our resume,
 659          * then the driver is already unconfigured and the remainder of
 660          * this function isn't needed.
 661          * XXX: what about WoWLAN? If the device has software state, e.g.
 662          *      memory allocated, it might expect teardown commands from
 663          *      mac80211 here?
 664          */
 665         if (local->suspended) {
 666                 WARN_ON(local->wowlan);
 667                 WARN_ON(rcu_access_pointer(local->monitor_sdata));
 668                 return;
 669         }
 670
 671         switch (sdata->vif.type) {
 672         case NL80211_IFTYPE_AP_VLAN:
 673                 break;
 674         case NL80211_IFTYPE_MONITOR:
 675                 if (local->monitors == 0)
 676                         ieee80211_del_virtual_monitor(local);
 677
 678                 mutex_lock(&local->mtx);
 679                 ieee80211_recalc_idle(local);
 680                 mutex_unlock(&local->mtx);
 681
 682                 if (!(sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE))
 683                         break;
 684
 685                 fallthrough;
 686         default:
 687                 if (going_down)
 688                         drv_remove_interface(local, sdata);
 689         }
 690
 691         ieee80211_recalc_ps(local);
 692
 693         if (cancel_scan)
 694                 flush_delayed_work(&local->scan_work);
 695
 696         if (local->open_count == 0) {
 697                 ieee80211_stop_device(local);
 698
 699                 /* no reconfiguring after stop! */
 700                 return;
 701         }
 702
 703         /* do after stop to avoid reconfiguring when we stop anyway */
 704         ieee80211_configure_filter(local);
 705         ieee80211_hw_config(local, hw_reconf_flags);
 706
 707         if (local->monitors == local->open_count)
 708                 ieee80211_add_virtual_monitor(local);
 709 }
 710
 711 static void ieee80211_stop_mbssid(struct ieee80211_sub_if_data *sdata)
 712 {
 713         struct ieee80211_sub_if_data *tx_sdata, *non_tx_sdata, *tmp_sdata;
 714         struct ieee80211_vif *tx_vif = sdata->vif.mbssid_tx_vif;
 715
 716         if (!tx_vif)
 717                 return;
 718
 719         tx_sdata = vif_to_sdata(tx_vif);
 720         sdata->vif.mbssid_tx_vif = NULL;
 721
 722         list_for_each_entry_safe(non_tx_sdata, tmp_sdata,
 723                                  &tx_sdata->local->interfaces, list) {
 724                 if (non_tx_sdata != sdata && non_tx_sdata != tx_sdata &&
 725                     non_tx_sdata->vif.mbssid_tx_vif == tx_vif &&
 726                     ieee80211_sdata_running(non_tx_sdata)) {
 727                         non_tx_sdata->vif.mbssid_tx_vif = NULL;
 728                         dev_close(non_tx_sdata->wdev.netdev);
 729                 }
 730         }
 731
 732         if (sdata != tx_sdata && ieee80211_sdata_running(tx_sdata)) {
 733                 tx_sdata->vif.mbssid_tx_vif = NULL;
 734                 dev_close(tx_sdata->wdev.netdev);
 735         }
 736 }
 737
 738 static int ieee80211_stop(struct net_device *dev)
 739 {
 740         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 741
 742         /* close dependent VLAN and MBSSID interfaces before locking wiphy */
 743         if (sdata->vif.type == NL80211_IFTYPE_AP) {
 744                 struct ieee80211_sub_if_data *vlan, *tmpsdata;
 745
 746                 list_for_each_entry_safe(vlan, tmpsdata, &sdata->u.ap.vlans,
 747                                          u.vlan.list)
 748                         dev_close(vlan->dev);
 749
 750                 ieee80211_stop_mbssid(sdata);
 751         }
 752
 753         cancel_work_sync(&sdata->activate_links_work);
 754
 755         wiphy_lock(sdata->local->hw.wiphy);
 756         ieee80211_do_stop(sdata, true);
 757         wiphy_unlock(sdata->local->hw.wiphy);
 758
 759         return 0;
 760 }
 761
 762 static void ieee80211_set_multicast_list(struct net_device *dev)
 763 {
 764         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 765         struct ieee80211_local *local = sdata->local;
 766         int allmulti, sdata_allmulti;
 767
 768         allmulti = !!(dev->flags & IFF_ALLMULTI);
 769         sdata_allmulti = !!(sdata->flags & IEEE80211_SDATA_ALLMULTI);
 770
 771         if (allmulti != sdata_allmulti) {
 772                 if (dev->flags & IFF_ALLMULTI)
 773                         atomic_inc(&local->iff_allmultis);
 774                 else
 775                         atomic_dec(&local->iff_allmultis);
 776                 sdata->flags ^= IEEE80211_SDATA_ALLMULTI;
 777         }
 778
 779         spin_lock_bh(&local->filter_lock);
 780         __hw_addr_sync(&local->mc_list, &dev->mc, dev->addr_len);
 781         spin_unlock_bh(&local->filter_lock);
 782         ieee80211_queue_work(&local->hw, &local->reconfig_filter);
 783 }
 784
 785 /*
 786  * Called when the netdev is removed or, by the code below, before
 787  * the interface type changes.
 788  */
 789 static void ieee80211_teardown_sdata(struct ieee80211_sub_if_data *sdata)
 790 {
 791         /* free extra data */
 792         ieee80211_free_keys(sdata, false);
 793
 794         ieee80211_debugfs_remove_netdev(sdata);
 795
 796         ieee80211_destroy_frag_cache(&sdata->frags);
 797
 798         if (ieee80211_vif_is_mesh(&sdata->vif))
 799                 ieee80211_mesh_teardown_sdata(sdata);
 800
 801         ieee80211_vif_clear_links(sdata);
 802         ieee80211_link_stop(&sdata->deflink);
 803 }
 804
 805 static void ieee80211_uninit(struct net_device *dev)
 806 {
 807         ieee80211_teardown_sdata(IEEE80211_DEV_TO_SUB_IF(dev));
 808 }
 809
 810 static void
 811 ieee80211_get_stats64(struct net_device *dev, struct rtnl_link_stats64 *stats)
 812 {
 813         dev_fetch_sw_netstats(stats, dev->tstats);
 814 }
 815
 816 static int ieee80211_netdev_setup_tc(struct net_device *dev,
 817                                      enum tc_setup_type type, void *type_data)
 818 {
 819         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 820         struct ieee80211_local *local = sdata->local;
 821
 822         return drv_net_setup_tc(local, sdata, dev, type, type_data);
 823 }
 824
 825 static const struct net_device_ops ieee80211_dataif_ops = {
 826         .ndo_open               = ieee80211_open,
 827         .ndo_stop               = ieee80211_stop,
 828         .ndo_uninit             = ieee80211_uninit,
 829         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 830         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 831         .ndo_set_mac_address    = ieee80211_change_mac,
 832         .ndo_get_stats64        = ieee80211_get_stats64,
 833         .ndo_setup_tc           = ieee80211_netdev_setup_tc,
 834 };
 835
 836 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 837                                           struct sk_buff *skb,
 838                                           struct net_device *sb_dev)
 839 {
 840         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 841         struct ieee80211_local *local = sdata->local;
 842         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 843         struct ieee80211_hdr *hdr;
 844         int len_rthdr;
 845
 846         if (local->hw.queues < IEEE80211_NUM_ACS)
 847                 return 0;
 848
 849         /* reset flags and info before parsing radiotap header */
 850         memset(info, 0, sizeof(*info));
 851
 852         if (!ieee80211_parse_tx_radiotap(skb, dev))
 853                 return 0; /* doesn't matter, frame will be dropped */
 854
 855         len_rthdr = ieee80211_get_radiotap_len(skb->data);
 856         hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
 857         if (skb->len < len_rthdr + 2 ||
 858             skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
 859                 return 0; /* doesn't matter, frame will be dropped */
 860
 861         return ieee80211_select_queue_80211(sdata, skb, hdr);
 862 }
 863
 864 static const struct net_device_ops ieee80211_monitorif_ops = {
 865         .ndo_open               = ieee80211_open,
 866         .ndo_stop               = ieee80211_stop,
 867         .ndo_uninit             = ieee80211_uninit,
 868         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 869         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 870         .ndo_set_mac_address    = ieee80211_change_mac,
 871         .ndo_select_queue       = ieee80211_monitor_select_queue,
 872         .ndo_get_stats64        = ieee80211_get_stats64,
 873 };
 874
 875 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx,
 876                                               struct net_device_path *path)
 877 {
 878         struct ieee80211_sub_if_data *sdata;
 879         struct ieee80211_local *local;
 880         struct sta_info *sta;
 881         int ret = -ENOENT;
 882
 883         sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev);
 884         local = sdata->local;
 885
 886         if (!local->ops->net_fill_forward_path)
 887                 return -EOPNOTSUPP;
 888
 889         rcu_read_lock();
 890         switch (sdata->vif.type) {
 891         case NL80211_IFTYPE_AP_VLAN:
 892                 sta = rcu_dereference(sdata->u.vlan.sta);
 893                 if (sta)
 894                         break;
 895                 if (sdata->wdev.use_4addr)
 896                         goto out;
 897                 if (is_multicast_ether_addr(ctx->daddr))
 898                         goto out;
 899                 sta = sta_info_get_bss(sdata, ctx->daddr);
 900                 break;
 901         case NL80211_IFTYPE_AP:
 902                 if (is_multicast_ether_addr(ctx->daddr))
 903                         goto out;
 904                 sta = sta_info_get(sdata, ctx->daddr);
 905                 break;
 906         case NL80211_IFTYPE_STATION:
 907                 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
 908                         sta = sta_info_get(sdata, ctx->daddr);
 909                         if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
 910                                 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
 911                                         goto out;
 912
 913                                 break;
 914                         }
 915                 }
 916
 917                 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid);
 918                 break;
 919         default:
 920                 goto out;
 921         }
 922
 923         if (!sta)
 924                 goto out;
 925
 926         ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path);
 927 out:
 928         rcu_read_unlock();
 929
 930         return ret;
 931 }
 932
 933 static const struct net_device_ops ieee80211_dataif_8023_ops = {
 934         .ndo_open               = ieee80211_open,
 935         .ndo_stop               = ieee80211_stop,
 936         .ndo_uninit             = ieee80211_uninit,
 937         .ndo_start_xmit         = ieee80211_subif_start_xmit_8023,
 938         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 939         .ndo_set_mac_address    = ieee80211_change_mac,
 940         .ndo_get_stats64        = ieee80211_get_stats64,
 941         .ndo_fill_forward_path  = ieee80211_netdev_fill_forward_path,
 942         .ndo_setup_tc           = ieee80211_netdev_setup_tc,
 943 };
 944
 945 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)
 946 {
 947         switch (iftype) {
 948         /* P2P GO and client are mapped to AP/STATION types */
 949         case NL80211_IFTYPE_AP:
 950         case NL80211_IFTYPE_STATION:
 951                 return true;
 952         default:
 953                 return false;
 954         }
 955 }
 956
 957 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
 958 {
 959         struct ieee80211_local *local = sdata->local;
 960         u32 flags;
 961
 962         flags = sdata->vif.offload_flags;
 963
 964         if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
 965             ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
 966                 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
 967
 968                 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
 969                     local->hw.wiphy->frag_threshold != (u32)-1)
 970                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 971
 972                 if (local->monitors)
 973                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 974         } else {
 975                 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 976         }
 977
 978         if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) &&
 979             ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
 980                 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED;
 981
 982                 if (local->monitors &&
 983                     !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP))
 984                         flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
 985         } else {
 986                 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
 987         }
 988
 989         if (sdata->vif.offload_flags == flags)
 990                 return false;
 991
 992         sdata->vif.offload_flags = flags;
 993         ieee80211_check_fast_rx_iface(sdata);
 994         return true;
 995 }
 996
 997 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
 998 {
 999         struct ieee80211_local *local = sdata->local;
1000         struct ieee80211_sub_if_data *bss = sdata;
1001         bool enabled;
1002
1003         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1004                 if (!sdata->bss)
1005                         return;
1006
1007                 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
1008         }
1009
1010         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
1011             !ieee80211_iftype_supports_hdr_offload(bss->vif.type))
1012                 return;
1013
1014         enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
1015         if (sdata->wdev.use_4addr &&
1016             !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
1017                 enabled = false;
1018
1019         sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
1020                                            &ieee80211_dataif_ops;
1021 }
1022
1023 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
1024 {
1025         struct ieee80211_local *local = sdata->local;
1026         struct ieee80211_sub_if_data *vsdata;
1027
1028         if (ieee80211_set_sdata_offload_flags(sdata)) {
1029                 drv_update_vif_offload(local, sdata);
1030                 ieee80211_set_vif_encap_ops(sdata);
1031         }
1032
1033         list_for_each_entry(vsdata, &local->interfaces, list) {
1034                 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
1035                     vsdata->bss != &sdata->u.ap)
1036                         continue;
1037
1038                 ieee80211_set_vif_encap_ops(vsdata);
1039         }
1040 }
1041
1042 void ieee80211_recalc_offload(struct ieee80211_local *local)
1043 {
1044         struct ieee80211_sub_if_data *sdata;
1045
1046         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
1047                 return;
1048
1049         mutex_lock(&local->iflist_mtx);
1050
1051         list_for_each_entry(sdata, &local->interfaces, list) {
1052                 if (!ieee80211_sdata_running(sdata))
1053                         continue;
1054
1055                 ieee80211_recalc_sdata_offload(sdata);
1056         }
1057
1058         mutex_unlock(&local->iflist_mtx);
1059 }
1060
1061 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
1062                                     const int offset)
1063 {
1064         struct ieee80211_local *local = sdata->local;
1065         u32 flags = sdata->u.mntr.flags;
1066
1067 #define ADJUST(_f, _s)  do {                                    \
1068         if (flags & MONITOR_FLAG_##_f)                          \
1069                 local->fif_##_s += offset;                      \
1070         } while (0)
1071
1072         ADJUST(FCSFAIL, fcsfail);
1073         ADJUST(PLCPFAIL, plcpfail);
1074         ADJUST(CONTROL, control);
1075         ADJUST(CONTROL, pspoll);
1076         ADJUST(OTHER_BSS, other_bss);
1077
1078 #undef ADJUST
1079 }
1080
1081 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
1082 {
1083         struct ieee80211_local *local = sdata->local;
1084         int i;
1085
1086         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
1087                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1088                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
1089                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
1090                         sdata->vif.hw_queue[i] = i;
1091                 else
1092                         sdata->vif.hw_queue[i] = 0;
1093         }
1094         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
1095 }
1096
1097 static void ieee80211_sdata_init(struct ieee80211_local *local,
1098                                  struct ieee80211_sub_if_data *sdata)
1099 {
1100         sdata->local = local;
1101
1102         /*
1103          * Initialize the default link, so we can use link_id 0 for non-MLD,
1104          * and that continues to work for non-MLD-aware drivers that use just
1105          * vif.bss_conf instead of vif.link_conf.
1106          *
1107          * Note that we never change this, so if link ID 0 isn't used in an
1108          * MLD connection, we get a separate allocation for it.
1109          */
1110         ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf);
1111 }
1112
1113 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
1114 {
1115         struct ieee80211_sub_if_data *sdata;
1116         int ret;
1117
1118         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1119                 return 0;
1120
1121         ASSERT_RTNL();
1122         lockdep_assert_wiphy(local->hw.wiphy);
1123
1124         if (local->monitor_sdata)
1125                 return 0;
1126
1127         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
1128         if (!sdata)
1129                 return -ENOMEM;
1130
1131         /* set up data */
1132         sdata->vif.type = NL80211_IFTYPE_MONITOR;
1133         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
1134                  wiphy_name(local->hw.wiphy));
1135         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
1136
1137         ieee80211_sdata_init(local, sdata);
1138
1139         ieee80211_set_default_queues(sdata);
1140
1141         ret = drv_add_interface(local, sdata);
1142         if (WARN_ON(ret)) {
1143                 /* ok .. stupid driver, it asked for this! */
1144                 kfree(sdata);
1145                 return ret;
1146         }
1147
1148         set_bit(SDATA_STATE_RUNNING, &sdata->state);
1149
1150         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
1151         if (ret) {
1152                 kfree(sdata);
1153                 return ret;
1154         }
1155
1156         mutex_lock(&local->iflist_mtx);
1157         rcu_assign_pointer(local->monitor_sdata, sdata);
1158         mutex_unlock(&local->iflist_mtx);
1159
1160         mutex_lock(&local->mtx);
1161         ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chandef,
1162                                          IEEE80211_CHANCTX_EXCLUSIVE);
1163         mutex_unlock(&local->mtx);
1164         if (ret) {
1165                 mutex_lock(&local->iflist_mtx);
1166                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
1167                 mutex_unlock(&local->iflist_mtx);
1168                 synchronize_net();
1169                 drv_remove_interface(local, sdata);
1170                 kfree(sdata);
1171                 return ret;
1172         }
1173
1174         skb_queue_head_init(&sdata->skb_queue);
1175         skb_queue_head_init(&sdata->status_queue);
1176         INIT_WORK(&sdata->work, ieee80211_iface_work);
1177
1178         return 0;
1179 }
1180
1181 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
1182 {
1183         struct ieee80211_sub_if_data *sdata;
1184
1185         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1186                 return;
1187
1188         ASSERT_RTNL();
1189         lockdep_assert_wiphy(local->hw.wiphy);
1190
1191         mutex_lock(&local->iflist_mtx);
1192
1193         sdata = rcu_dereference_protected(local->monitor_sdata,
1194                                           lockdep_is_held(&local->iflist_mtx));
1195         if (!sdata) {
1196                 mutex_unlock(&local->iflist_mtx);
1197                 return;
1198         }
1199
1200         RCU_INIT_POINTER(local->monitor_sdata, NULL);
1201         mutex_unlock(&local->iflist_mtx);
1202
1203         synchronize_net();
1204
1205         mutex_lock(&local->mtx);
1206         ieee80211_link_release_channel(&sdata->deflink);
1207         mutex_unlock(&local->mtx);
1208
1209         drv_remove_interface(local, sdata);
1210
1211         kfree(sdata);
1212 }
1213
1214 /*
1215  * NOTE: Be very careful when changing this function, it must NOT return
1216  * an error on interface type changes that have been pre-checked, so most
1217  * checks should be in ieee80211_check_concurrent_iface.
1218  */
1219 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1220 {
1221         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1222         struct net_device *dev = wdev->netdev;
1223         struct ieee80211_local *local = sdata->local;
1224         u32 changed = 0;
1225         int res;
1226         u32 hw_reconf_flags = 0;
1227
1228         switch (sdata->vif.type) {
1229         case NL80211_IFTYPE_AP_VLAN: {
1230                 struct ieee80211_sub_if_data *master;
1231
1232                 if (!sdata->bss)
1233                         return -ENOLINK;
1234
1235                 mutex_lock(&local->mtx);
1236                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1237                 mutex_unlock(&local->mtx);
1238
1239                 master = container_of(sdata->bss,
1240                                       struct ieee80211_sub_if_data, u.ap);
1241                 sdata->control_port_protocol =
1242                         master->control_port_protocol;
1243                 sdata->control_port_no_encrypt =
1244                         master->control_port_no_encrypt;
1245                 sdata->control_port_over_nl80211 =
1246                         master->control_port_over_nl80211;
1247                 sdata->control_port_no_preauth =
1248                         master->control_port_no_preauth;
1249                 sdata->vif.cab_queue = master->vif.cab_queue;
1250                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1251                        sizeof(sdata->vif.hw_queue));
1252                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1253
1254                 mutex_lock(&local->key_mtx);
1255                 sdata->crypto_tx_tailroom_needed_cnt +=
1256                         master->crypto_tx_tailroom_needed_cnt;
1257                 mutex_unlock(&local->key_mtx);
1258
1259                 break;
1260                 }
1261         case NL80211_IFTYPE_AP:
1262                 sdata->bss = &sdata->u.ap;
1263                 break;
1264         case NL80211_IFTYPE_MESH_POINT:
1265         case NL80211_IFTYPE_STATION:
1266         case NL80211_IFTYPE_MONITOR:
1267         case NL80211_IFTYPE_ADHOC:
1268         case NL80211_IFTYPE_P2P_DEVICE:
1269         case NL80211_IFTYPE_OCB:
1270         case NL80211_IFTYPE_NAN:
1271                 /* no special treatment */
1272                 break;
1273         case NL80211_IFTYPE_UNSPECIFIED:
1274         case NUM_NL80211_IFTYPES:
1275         case NL80211_IFTYPE_P2P_CLIENT:
1276         case NL80211_IFTYPE_P2P_GO:
1277         case NL80211_IFTYPE_WDS:
1278                 /* cannot happen */
1279                 WARN_ON(1);
1280                 break;
1281         }
1282
1283         if (local->open_count == 0) {
1284                 res = drv_start(local);
1285                 if (res)
1286                         goto err_del_bss;
1287                 /* we're brought up, everything changes */
1288                 hw_reconf_flags = ~0;
1289                 ieee80211_led_radio(local, true);
1290                 ieee80211_mod_tpt_led_trig(local,
1291                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1292         }
1293
1294         /*
1295          * Copy the hopefully now-present MAC address to
1296          * this interface, if it has the special null one.
1297          */
1298         if (dev && is_zero_ether_addr(dev->dev_addr)) {
1299                 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr);
1300                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1301
1302                 if (!is_valid_ether_addr(dev->dev_addr)) {
1303                         res = -EADDRNOTAVAIL;
1304                         goto err_stop;
1305                 }
1306         }
1307
1308         switch (sdata->vif.type) {
1309         case NL80211_IFTYPE_AP_VLAN:
1310                 /* no need to tell driver, but set carrier and chanctx */
1311                 if (sdata->bss->active) {
1312                         ieee80211_link_vlan_copy_chanctx(&sdata->deflink);
1313                         netif_carrier_on(dev);
1314                         ieee80211_set_vif_encap_ops(sdata);
1315                 } else {
1316                         netif_carrier_off(dev);
1317                 }
1318                 break;
1319         case NL80211_IFTYPE_MONITOR:
1320                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1321                         local->cooked_mntrs++;
1322                         break;
1323                 }
1324
1325                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1326                         res = drv_add_interface(local, sdata);
1327                         if (res)
1328                                 goto err_stop;
1329                 } else if (local->monitors == 0 && local->open_count == 0) {
1330                         res = ieee80211_add_virtual_monitor(local);
1331                         if (res)
1332                                 goto err_stop;
1333                 }
1334
1335                 /* must be before the call to ieee80211_configure_filter */
1336                 local->monitors++;
1337                 if (local->monitors == 1) {
1338                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1339                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1340                 }
1341
1342                 ieee80211_adjust_monitor_flags(sdata, 1);
1343                 ieee80211_configure_filter(local);
1344                 ieee80211_recalc_offload(local);
1345                 mutex_lock(&local->mtx);
1346                 ieee80211_recalc_idle(local);
1347                 mutex_unlock(&local->mtx);
1348
1349                 netif_carrier_on(dev);
1350                 break;
1351         default:
1352                 if (coming_up) {
1353                         ieee80211_del_virtual_monitor(local);
1354                         ieee80211_set_sdata_offload_flags(sdata);
1355
1356                         res = drv_add_interface(local, sdata);
1357                         if (res)
1358                                 goto err_stop;
1359
1360                         ieee80211_set_vif_encap_ops(sdata);
1361                         res = ieee80211_check_queues(sdata,
1362                                 ieee80211_vif_type_p2p(&sdata->vif));
1363                         if (res)
1364                                 goto err_del_interface;
1365                 }
1366
1367                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1368                         local->fif_pspoll++;
1369                         local->fif_probe_req++;
1370
1371                         ieee80211_configure_filter(local);
1372                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1373                         local->fif_probe_req++;
1374                 }
1375
1376                 if (sdata->vif.probe_req_reg)
1377                         drv_config_iface_filter(local, sdata,
1378                                                 FIF_PROBE_REQ,
1379                                                 FIF_PROBE_REQ);
1380
1381                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1382                     sdata->vif.type != NL80211_IFTYPE_NAN)
1383                         changed |= ieee80211_reset_erp_info(sdata);
1384                 ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1385                                                   changed);
1386
1387                 switch (sdata->vif.type) {
1388                 case NL80211_IFTYPE_STATION:
1389                 case NL80211_IFTYPE_ADHOC:
1390                 case NL80211_IFTYPE_AP:
1391                 case NL80211_IFTYPE_MESH_POINT:
1392                 case NL80211_IFTYPE_OCB:
1393                         netif_carrier_off(dev);
1394                         break;
1395                 case NL80211_IFTYPE_P2P_DEVICE:
1396                 case NL80211_IFTYPE_NAN:
1397                         break;
1398                 default:
1399                         /* not reached */
1400                         WARN_ON(1);
1401                 }
1402
1403                 /*
1404                  * Set default queue parameters so drivers don't
1405                  * need to initialise the hardware if the hardware
1406                  * doesn't start up with sane defaults.
1407                  * Enable QoS for anything but station interfaces.
1408                  */
1409                 ieee80211_set_wmm_default(&sdata->deflink, true,
1410                         sdata->vif.type != NL80211_IFTYPE_STATION);
1411         }
1412
1413         switch (sdata->vif.type) {
1414         case NL80211_IFTYPE_P2P_DEVICE:
1415                 rcu_assign_pointer(local->p2p_sdata, sdata);
1416                 break;
1417         case NL80211_IFTYPE_MONITOR:
1418                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1419                         break;
1420                 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1421                 break;
1422         default:
1423                 break;
1424         }
1425
1426         /*
1427          * set_multicast_list will be invoked by the networking core
1428          * which will check whether any increments here were done in
1429          * error and sync them down to the hardware as filter flags.
1430          */
1431         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1432                 atomic_inc(&local->iff_allmultis);
1433
1434         if (coming_up)
1435                 local->open_count++;
1436
1437         if (hw_reconf_flags)
1438                 ieee80211_hw_config(local, hw_reconf_flags);
1439
1440         ieee80211_recalc_ps(local);
1441
1442         set_bit(SDATA_STATE_RUNNING, &sdata->state);
1443
1444         return 0;
1445  err_del_interface:
1446         drv_remove_interface(local, sdata);
1447  err_stop:
1448         if (!local->open_count)
1449                 drv_stop(local);
1450  err_del_bss:
1451         sdata->bss = NULL;
1452         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1453                 mutex_lock(&local->mtx);
1454                 list_del(&sdata->u.vlan.list);
1455                 mutex_unlock(&local->mtx);
1456         }
1457         /* might already be clear but that doesn't matter */
1458         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1459         return res;
1460 }
1461
1462 static void ieee80211_if_free(struct net_device *dev)
1463 {
1464         free_percpu(dev->tstats);
1465 }
1466
1467 static void ieee80211_if_setup(struct net_device *dev)
1468 {
1469         ether_setup(dev);
1470         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1471         dev->priv_flags |= IFF_NO_QUEUE;
1472         dev->netdev_ops = &ieee80211_dataif_ops;
1473         dev->needs_free_netdev = true;
1474         dev->priv_destructor = ieee80211_if_free;
1475 }
1476
1477 static void ieee80211_iface_process_skb(struct ieee80211_local *local,
1478                                         struct ieee80211_sub_if_data *sdata,
1479                                         struct sk_buff *skb)
1480 {
1481         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1482
1483         if (ieee80211_is_action(mgmt->frame_control) &&
1484             mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1485                 struct sta_info *sta;
1486                 int len = skb->len;
1487
1488                 mutex_lock(&local->sta_mtx);
1489                 sta = sta_info_get_bss(sdata, mgmt->sa);
1490                 if (sta) {
1491                         switch (mgmt->u.action.u.addba_req.action_code) {
1492                         case WLAN_ACTION_ADDBA_REQ:
1493                                 ieee80211_process_addba_request(local, sta,
1494                                                                 mgmt, len);
1495                                 break;
1496                         case WLAN_ACTION_ADDBA_RESP:
1497                                 ieee80211_process_addba_resp(local, sta,
1498                                                              mgmt, len);
1499                                 break;
1500                         case WLAN_ACTION_DELBA:
1501                                 ieee80211_process_delba(sdata, sta,
1502                                                         mgmt, len);
1503                                 break;
1504                         default:
1505                                 WARN_ON(1);
1506                                 break;
1507                         }
1508                 }
1509                 mutex_unlock(&local->sta_mtx);
1510         } else if (ieee80211_is_action(mgmt->frame_control) &&
1511                    mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1512                 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1513                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1514                         struct ieee80211_rx_status *status;
1515                         enum nl80211_band band;
1516                         struct sta_info *sta;
1517                         u8 opmode;
1518
1519                         status = IEEE80211_SKB_RXCB(skb);
1520                         band = status->band;
1521                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1522
1523                         mutex_lock(&local->sta_mtx);
1524                         sta = sta_info_get_bss(sdata, mgmt->sa);
1525
1526                         if (sta)
1527                                 ieee80211_vht_handle_opmode(sdata,
1528                                                             &sta->deflink,
1529                                                             opmode, band);
1530
1531                         mutex_unlock(&local->sta_mtx);
1532                         break;
1533                 }
1534                 case WLAN_VHT_ACTION_GROUPID_MGMT:
1535                         ieee80211_process_mu_groups(sdata, &sdata->deflink,
1536                                                     mgmt);
1537                         break;
1538                 default:
1539                         WARN_ON(1);
1540                         break;
1541                 }
1542         } else if (ieee80211_is_action(mgmt->frame_control) &&
1543                    mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1544                 switch (mgmt->u.action.u.s1g.action_code) {
1545                 case WLAN_S1G_TWT_TEARDOWN:
1546                 case WLAN_S1G_TWT_SETUP:
1547                         ieee80211_s1g_rx_twt_action(sdata, skb);
1548                         break;
1549                 default:
1550                         break;
1551                 }
1552         } else if (ieee80211_is_ext(mgmt->frame_control)) {
1553                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1554                         ieee80211_sta_rx_queued_ext(sdata, skb);
1555                 else
1556                         WARN_ON(1);
1557         } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1558                 struct ieee80211_hdr *hdr = (void *)mgmt;
1559                 struct sta_info *sta;
1560
1561                 /*
1562                  * So the frame isn't mgmt, but frame_control
1563                  * is at the right place anyway, of course, so
1564                  * the if statement is correct.
1565                  *
1566                  * Warn if we have other data frame types here,
1567                  * they must not get here.
1568                  */
1569                 WARN_ON(hdr->frame_control &
1570                                 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1571                 WARN_ON(!(hdr->seq_ctrl &
1572                                 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1573                 /*
1574                  * This was a fragment of a frame, received while
1575                  * a block-ack session was active. That cannot be
1576                  * right, so terminate the session.
1577                  */
1578                 mutex_lock(&local->sta_mtx);
1579                 sta = sta_info_get_bss(sdata, mgmt->sa);
1580                 if (sta) {
1581                         u16 tid = ieee80211_get_tid(hdr);
1582
1583                         __ieee80211_stop_rx_ba_session(
1584                                 sta, tid, WLAN_BACK_RECIPIENT,
1585                                 WLAN_REASON_QSTA_REQUIRE_SETUP,
1586                                 true);
1587                 }
1588                 mutex_unlock(&local->sta_mtx);
1589         } else switch (sdata->vif.type) {
1590         case NL80211_IFTYPE_STATION:
1591                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1592                 break;
1593         case NL80211_IFTYPE_ADHOC:
1594                 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1595                 break;
1596         case NL80211_IFTYPE_MESH_POINT:
1597                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1598                         break;
1599                 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1600                 break;
1601         default:
1602                 WARN(1, "frame for unexpected interface type");
1603                 break;
1604         }
1605 }
1606
1607 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata,
1608                                            struct sk_buff *skb)
1609 {
1610         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1611
1612         if (ieee80211_is_action(mgmt->frame_control) &&
1613             mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1614                 switch (mgmt->u.action.u.s1g.action_code) {
1615                 case WLAN_S1G_TWT_TEARDOWN:
1616                 case WLAN_S1G_TWT_SETUP:
1617                         ieee80211_s1g_status_twt_action(sdata, skb);
1618                         break;
1619                 default:
1620                         break;
1621                 }
1622         }
1623 }
1624
1625 static void ieee80211_iface_work(struct work_struct *work)
1626 {
1627         struct ieee80211_sub_if_data *sdata =
1628                 container_of(work, struct ieee80211_sub_if_data, work);
1629         struct ieee80211_local *local = sdata->local;
1630         struct sk_buff *skb;
1631
1632         if (!ieee80211_sdata_running(sdata))
1633                 return;
1634
1635         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1636                 return;
1637
1638         if (!ieee80211_can_run_worker(local))
1639                 return;
1640
1641         /* first process frames */
1642         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1643                 kcov_remote_start_common(skb_get_kcov_handle(skb));
1644
1645                 if (skb->protocol == cpu_to_be16(ETH_P_TDLS))
1646                         ieee80211_process_tdls_channel_switch(sdata, skb);
1647                 else
1648                         ieee80211_iface_process_skb(local, sdata, skb);
1649
1650                 kfree_skb(skb);
1651                 kcov_remote_stop();
1652         }
1653
1654         /* process status queue */
1655         while ((skb = skb_dequeue(&sdata->status_queue))) {
1656                 kcov_remote_start_common(skb_get_kcov_handle(skb));
1657
1658                 ieee80211_iface_process_status(sdata, skb);
1659                 kfree_skb(skb);
1660
1661                 kcov_remote_stop();
1662         }
1663
1664         /* then other type-dependent work */
1665         switch (sdata->vif.type) {
1666         case NL80211_IFTYPE_STATION:
1667                 ieee80211_sta_work(sdata);
1668                 break;
1669         case NL80211_IFTYPE_ADHOC:
1670                 ieee80211_ibss_work(sdata);
1671                 break;
1672         case NL80211_IFTYPE_MESH_POINT:
1673                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1674                         break;
1675                 ieee80211_mesh_work(sdata);
1676                 break;
1677         case NL80211_IFTYPE_OCB:
1678                 ieee80211_ocb_work(sdata);
1679                 break;
1680         default:
1681                 break;
1682         }
1683 }
1684
1685 static void ieee80211_recalc_smps_work(struct work_struct *work)
1686 {
1687         struct ieee80211_sub_if_data *sdata =
1688                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1689
1690         ieee80211_recalc_smps(sdata, &sdata->deflink);
1691 }
1692
1693 static void ieee80211_activate_links_work(struct work_struct *work)
1694 {
1695         struct ieee80211_sub_if_data *sdata =
1696                 container_of(work, struct ieee80211_sub_if_data,
1697                              activate_links_work);
1698
1699         ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links);
1700 }
1701
1702 /*
1703  * Helper function to initialise an interface to a specific type.
1704  */
1705 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1706                                   enum nl80211_iftype type)
1707 {
1708         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1709                                                     0xff, 0xff, 0xff};
1710
1711         /* clear type-dependent unions */
1712         memset(&sdata->u, 0, sizeof(sdata->u));
1713         memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u));
1714
1715         /* and set some type-dependent values */
1716         sdata->vif.type = type;
1717         sdata->vif.p2p = false;
1718         sdata->wdev.iftype = type;
1719
1720         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1721         sdata->control_port_no_encrypt = false;
1722         sdata->control_port_over_nl80211 = false;
1723         sdata->control_port_no_preauth = false;
1724         sdata->vif.cfg.idle = true;
1725         sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1726
1727         sdata->noack_map = 0;
1728
1729         /* only monitor/p2p-device differ */
1730         if (sdata->dev) {
1731                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1732                 sdata->dev->type = ARPHRD_ETHER;
1733         }
1734
1735         skb_queue_head_init(&sdata->skb_queue);
1736         skb_queue_head_init(&sdata->status_queue);
1737         INIT_WORK(&sdata->work, ieee80211_iface_work);
1738         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1739         INIT_WORK(&sdata->activate_links_work, ieee80211_activate_links_work);
1740
1741         switch (type) {
1742         case NL80211_IFTYPE_P2P_GO:
1743                 type = NL80211_IFTYPE_AP;
1744                 sdata->vif.type = type;
1745                 sdata->vif.p2p = true;
1746                 fallthrough;
1747         case NL80211_IFTYPE_AP:
1748                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1749                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1750                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1751                 break;
1752         case NL80211_IFTYPE_P2P_CLIENT:
1753                 type = NL80211_IFTYPE_STATION;
1754                 sdata->vif.type = type;
1755                 sdata->vif.p2p = true;
1756                 fallthrough;
1757         case NL80211_IFTYPE_STATION:
1758                 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid;
1759                 ieee80211_sta_setup_sdata(sdata);
1760                 break;
1761         case NL80211_IFTYPE_OCB:
1762                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1763                 ieee80211_ocb_setup_sdata(sdata);
1764                 break;
1765         case NL80211_IFTYPE_ADHOC:
1766                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1767                 ieee80211_ibss_setup_sdata(sdata);
1768                 break;
1769         case NL80211_IFTYPE_MESH_POINT:
1770                 if (ieee80211_vif_is_mesh(&sdata->vif))
1771                         ieee80211_mesh_init_sdata(sdata);
1772                 break;
1773         case NL80211_IFTYPE_MONITOR:
1774                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1775                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1776                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1777                                       MONITOR_FLAG_OTHER_BSS;
1778                 break;
1779         case NL80211_IFTYPE_NAN:
1780                 idr_init(&sdata->u.nan.function_inst_ids);
1781                 spin_lock_init(&sdata->u.nan.func_lock);
1782                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1783                 break;
1784         case NL80211_IFTYPE_AP_VLAN:
1785         case NL80211_IFTYPE_P2P_DEVICE:
1786                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1787                 break;
1788         case NL80211_IFTYPE_UNSPECIFIED:
1789         case NL80211_IFTYPE_WDS:
1790         case NUM_NL80211_IFTYPES:
1791                 WARN_ON(1);
1792                 break;
1793         }
1794
1795         /* need to do this after the switch so vif.type is correct */
1796         ieee80211_link_setup(&sdata->deflink);
1797
1798         ieee80211_debugfs_add_netdev(sdata);
1799 }
1800
1801 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1802                                            enum nl80211_iftype type)
1803 {
1804         struct ieee80211_local *local = sdata->local;
1805         int ret, err;
1806         enum nl80211_iftype internal_type = type;
1807         bool p2p = false;
1808
1809         ASSERT_RTNL();
1810
1811         if (!local->ops->change_interface)
1812                 return -EBUSY;
1813
1814         /* for now, don't support changing while links exist */
1815         if (sdata->vif.valid_links)
1816                 return -EBUSY;
1817
1818         switch (sdata->vif.type) {
1819         case NL80211_IFTYPE_AP:
1820                 if (!list_empty(&sdata->u.ap.vlans))
1821                         return -EBUSY;
1822                 break;
1823         case NL80211_IFTYPE_STATION:
1824         case NL80211_IFTYPE_ADHOC:
1825         case NL80211_IFTYPE_OCB:
1826                 /*
1827                  * Could maybe also all others here?
1828                  * Just not sure how that interacts
1829                  * with the RX/config path e.g. for
1830                  * mesh.
1831                  */
1832                 break;
1833         default:
1834                 return -EBUSY;
1835         }
1836
1837         switch (type) {
1838         case NL80211_IFTYPE_AP:
1839         case NL80211_IFTYPE_STATION:
1840         case NL80211_IFTYPE_ADHOC:
1841         case NL80211_IFTYPE_OCB:
1842                 /*
1843                  * Could probably support everything
1844                  * but here.
1845                  */
1846                 break;
1847         case NL80211_IFTYPE_P2P_CLIENT:
1848                 p2p = true;
1849                 internal_type = NL80211_IFTYPE_STATION;
1850                 break;
1851         case NL80211_IFTYPE_P2P_GO:
1852                 p2p = true;
1853                 internal_type = NL80211_IFTYPE_AP;
1854                 break;
1855         default:
1856                 return -EBUSY;
1857         }
1858
1859         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1860         if (ret)
1861                 return ret;
1862
1863         ieee80211_stop_vif_queues(local, sdata,
1864                                   IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1865         /* do_stop will synchronize_rcu() first thing */
1866         ieee80211_do_stop(sdata, false);
1867
1868         ieee80211_teardown_sdata(sdata);
1869
1870         ieee80211_set_sdata_offload_flags(sdata);
1871         ret = drv_change_interface(local, sdata, internal_type, p2p);
1872         if (ret)
1873                 type = ieee80211_vif_type_p2p(&sdata->vif);
1874
1875         /*
1876          * Ignore return value here, there's not much we can do since
1877          * the driver changed the interface type internally already.
1878          * The warnings will hopefully make driver authors fix it :-)
1879          */
1880         ieee80211_check_queues(sdata, type);
1881
1882         ieee80211_setup_sdata(sdata, type);
1883         ieee80211_set_vif_encap_ops(sdata);
1884
1885         err = ieee80211_do_open(&sdata->wdev, false);
1886         WARN(err, "type change: do_open returned %d", err);
1887
1888         ieee80211_wake_vif_queues(local, sdata,
1889                                   IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1890         return ret;
1891 }
1892
1893 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1894                              enum nl80211_iftype type)
1895 {
1896         int ret;
1897
1898         ASSERT_RTNL();
1899
1900         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1901                 return 0;
1902
1903         if (ieee80211_sdata_running(sdata)) {
1904                 ret = ieee80211_runtime_change_iftype(sdata, type);
1905                 if (ret)
1906                         return ret;
1907         } else {
1908                 /* Purge and reset type-dependent state. */
1909                 ieee80211_teardown_sdata(sdata);
1910                 ieee80211_setup_sdata(sdata, type);
1911         }
1912
1913         /* reset some values that shouldn't be kept across type changes */
1914         if (type == NL80211_IFTYPE_STATION)
1915                 sdata->u.mgd.use_4addr = false;
1916
1917         return 0;
1918 }
1919
1920 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1921                                        u8 *perm_addr, enum nl80211_iftype type)
1922 {
1923         struct ieee80211_sub_if_data *sdata;
1924         u64 mask, start, addr, val, inc;
1925         u8 *m;
1926         u8 tmp_addr[ETH_ALEN];
1927         int i;
1928
1929         /* default ... something at least */
1930         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1931
1932         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1933             local->hw.wiphy->n_addresses <= 1)
1934                 return;
1935
1936         mutex_lock(&local->iflist_mtx);
1937
1938         switch (type) {
1939         case NL80211_IFTYPE_MONITOR:
1940                 /* doesn't matter */
1941                 break;
1942         case NL80211_IFTYPE_AP_VLAN:
1943                 /* match up with an AP interface */
1944                 list_for_each_entry(sdata, &local->interfaces, list) {
1945                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1946                                 continue;
1947                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1948                         break;
1949                 }
1950                 /* keep default if no AP interface present */
1951                 break;
1952         case NL80211_IFTYPE_P2P_CLIENT:
1953         case NL80211_IFTYPE_P2P_GO:
1954                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1955                         list_for_each_entry(sdata, &local->interfaces, list) {
1956                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1957                                         continue;
1958                                 if (!ieee80211_sdata_running(sdata))
1959                                         continue;
1960                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1961                                 goto out_unlock;
1962                         }
1963                 }
1964                 fallthrough;
1965         default:
1966                 /* assign a new address if possible -- try n_addresses first */
1967                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1968                         bool used = false;
1969
1970                         list_for_each_entry(sdata, &local->interfaces, list) {
1971                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1972                                                      sdata->vif.addr)) {
1973                                         used = true;
1974                                         break;
1975                                 }
1976                         }
1977
1978                         if (!used) {
1979                                 memcpy(perm_addr,
1980                                        local->hw.wiphy->addresses[i].addr,
1981                                        ETH_ALEN);
1982                                 break;
1983                         }
1984                 }
1985
1986                 /* try mask if available */
1987                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1988                         break;
1989
1990                 m = local->hw.wiphy->addr_mask;
1991                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1992                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1993                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1994
1995                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1996                         /* not a contiguous mask ... not handled now! */
1997                         pr_info("not contiguous\n");
1998                         break;
1999                 }
2000
2001                 /*
2002                  * Pick address of existing interface in case user changed
2003                  * MAC address manually, default to perm_addr.
2004                  */
2005                 m = local->hw.wiphy->perm_addr;
2006                 list_for_each_entry(sdata, &local->interfaces, list) {
2007                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
2008                                 continue;
2009                         m = sdata->vif.addr;
2010                         break;
2011                 }
2012                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
2013                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
2014                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
2015
2016                 inc = 1ULL<<__ffs64(mask);
2017                 val = (start & mask);
2018                 addr = (start & ~mask) | (val & mask);
2019                 do {
2020                         bool used = false;
2021
2022                         tmp_addr[5] = addr >> 0*8;
2023                         tmp_addr[4] = addr >> 1*8;
2024                         tmp_addr[3] = addr >> 2*8;
2025                         tmp_addr[2] = addr >> 3*8;
2026                         tmp_addr[1] = addr >> 4*8;
2027                         tmp_addr[0] = addr >> 5*8;
2028
2029                         val += inc;
2030
2031                         list_for_each_entry(sdata, &local->interfaces, list) {
2032                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
2033                                         used = true;
2034                                         break;
2035                                 }
2036                         }
2037
2038                         if (!used) {
2039                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
2040                                 break;
2041                         }
2042                         addr = (start & ~mask) | (val & mask);
2043                 } while (addr != start);
2044
2045                 break;
2046         }
2047
2048  out_unlock:
2049         mutex_unlock(&local->iflist_mtx);
2050 }
2051
2052 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
2053                      unsigned char name_assign_type,
2054                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
2055                      struct vif_params *params)
2056 {
2057         struct net_device *ndev = NULL;
2058         struct ieee80211_sub_if_data *sdata = NULL;
2059         struct txq_info *txqi;
2060         int ret, i;
2061
2062         ASSERT_RTNL();
2063
2064         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
2065                 struct wireless_dev *wdev;
2066
2067                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
2068                                 GFP_KERNEL);
2069                 if (!sdata)
2070                         return -ENOMEM;
2071                 wdev = &sdata->wdev;
2072
2073                 sdata->dev = NULL;
2074                 strscpy(sdata->name, name, IFNAMSIZ);
2075                 ieee80211_assign_perm_addr(local, wdev->address, type);
2076                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
2077                 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
2078         } else {
2079                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
2080                                  sizeof(void *));
2081                 int txq_size = 0;
2082
2083                 if (type != NL80211_IFTYPE_AP_VLAN &&
2084                     (type != NL80211_IFTYPE_MONITOR ||
2085                      (params->flags & MONITOR_FLAG_ACTIVE)))
2086                         txq_size += sizeof(struct txq_info) +
2087                                     local->hw.txq_data_size;
2088
2089                 ndev = alloc_netdev_mqs(size + txq_size,
2090                                         name, name_assign_type,
2091                                         ieee80211_if_setup, 1, 1);
2092                 if (!ndev)
2093                         return -ENOMEM;
2094
2095                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
2096
2097                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2098                 if (!ndev->tstats) {
2099                         free_netdev(ndev);
2100                         return -ENOMEM;
2101                 }
2102
2103                 ndev->needed_headroom = local->tx_headroom +
2104                                         4*6 /* four MAC addresses */
2105                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
2106                                         + 6 /* mesh */
2107                                         + 8 /* rfc1042/bridge tunnel */
2108                                         - ETH_HLEN /* ethernet hard_header_len */
2109                                         + IEEE80211_ENCRYPT_HEADROOM;
2110                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
2111
2112                 ret = dev_alloc_name(ndev, ndev->name);
2113                 if (ret < 0) {
2114                         ieee80211_if_free(ndev);
2115                         free_netdev(ndev);
2116                         return ret;
2117                 }
2118
2119                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
2120                 if (is_valid_ether_addr(params->macaddr))
2121                         eth_hw_addr_set(ndev, params->macaddr);
2122                 else
2123                         eth_hw_addr_set(ndev, ndev->perm_addr);
2124                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
2125
2126                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
2127                 sdata = netdev_priv(ndev);
2128                 ndev->ieee80211_ptr = &sdata->wdev;
2129                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
2130                 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
2131                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
2132
2133                 if (txq_size) {
2134                         txqi = netdev_priv(ndev) + size;
2135                         ieee80211_txq_init(sdata, NULL, txqi, 0);
2136                 }
2137
2138                 sdata->dev = ndev;
2139         }
2140
2141         /* initialise type-independent data */
2142         sdata->wdev.wiphy = local->hw.wiphy;
2143
2144         ieee80211_sdata_init(local, sdata);
2145
2146         ieee80211_init_frag_cache(&sdata->frags);
2147
2148         INIT_LIST_HEAD(&sdata->key_list);
2149
2150         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
2151                           ieee80211_delayed_tailroom_dec);
2152
2153         for (i = 0; i < NUM_NL80211_BANDS; i++) {
2154                 struct ieee80211_supported_band *sband;
2155                 sband = local->hw.wiphy->bands[i];
2156                 sdata->rc_rateidx_mask[i] =
2157                         sband ? (1 << sband->n_bitrates) - 1 : 0;
2158                 if (sband) {
2159                         __le16 cap;
2160                         u16 *vht_rate_mask;
2161
2162                         memcpy(sdata->rc_rateidx_mcs_mask[i],
2163                                sband->ht_cap.mcs.rx_mask,
2164                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
2165
2166                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
2167                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
2168                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
2169                 } else {
2170                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
2171                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
2172                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
2173                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
2174                 }
2175         }
2176
2177         ieee80211_set_default_queues(sdata);
2178
2179         sdata->deflink.ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2180         sdata->deflink.user_power_level = local->user_power_level;
2181
2182         /* setup type-dependent data */
2183         ieee80211_setup_sdata(sdata, type);
2184
2185         if (ndev) {
2186                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
2187                 if (type == NL80211_IFTYPE_STATION)
2188                         sdata->u.mgd.use_4addr = params->use_4addr;
2189
2190                 ndev->features |= local->hw.netdev_features;
2191                 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2192                 ndev->hw_features |= ndev->features &
2193                                         MAC80211_SUPPORTED_FEATURES_TX;
2194                 sdata->vif.netdev_features = local->hw.netdev_features;
2195
2196                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
2197
2198                 /* MTU range is normally 256 - 2304, where the upper limit is
2199                  * the maximum MSDU size. Monitor interfaces send and receive
2200                  * MPDU and A-MSDU frames which may be much larger so we do
2201                  * not impose an upper limit in that case.
2202                  */
2203                 ndev->min_mtu = 256;
2204                 if (type == NL80211_IFTYPE_MONITOR)
2205                         ndev->max_mtu = 0;
2206                 else
2207                         ndev->max_mtu = local->hw.max_mtu;
2208
2209                 ret = cfg80211_register_netdevice(ndev);
2210                 if (ret) {
2211                         free_netdev(ndev);
2212                         return ret;
2213                 }
2214         }
2215
2216         mutex_lock(&local->iflist_mtx);
2217         list_add_tail_rcu(&sdata->list, &local->interfaces);
2218         mutex_unlock(&local->iflist_mtx);
2219
2220         if (new_wdev)
2221                 *new_wdev = &sdata->wdev;
2222
2223         return 0;
2224 }
2225
2226 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2227 {
2228         ASSERT_RTNL();
2229
2230         mutex_lock(&sdata->local->iflist_mtx);
2231         list_del_rcu(&sdata->list);
2232         mutex_unlock(&sdata->local->iflist_mtx);
2233
2234         if (sdata->vif.txq)
2235                 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2236
2237         synchronize_rcu();
2238
2239         cfg80211_unregister_wdev(&sdata->wdev);
2240
2241         if (!sdata->dev) {
2242                 ieee80211_teardown_sdata(sdata);
2243                 kfree(sdata);
2244         }
2245 }
2246
2247 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2248 {
2249         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2250                 return;
2251         ieee80211_do_stop(sdata, true);
2252 }
2253
2254 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2255 {
2256         struct ieee80211_sub_if_data *sdata, *tmp;
2257         LIST_HEAD(unreg_list);
2258         LIST_HEAD(wdev_list);
2259
2260         ASSERT_RTNL();
2261
2262         /* Before destroying the interfaces, make sure they're all stopped so
2263          * that the hardware is stopped. Otherwise, the driver might still be
2264          * iterating the interfaces during the shutdown, e.g. from a worker
2265          * or from RX processing or similar, and if it does so (using atomic
2266          * iteration) while we're manipulating the list, the iteration will
2267          * crash.
2268          *
2269          * After this, the hardware should be stopped and the driver should
2270          * have stopped all of its activities, so that we can do RCU-unaware
2271          * manipulations of the interface list below.
2272          */
2273         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2274
2275         WARN(local->open_count, "%s: open count remains %d\n",
2276              wiphy_name(local->hw.wiphy), local->open_count);
2277
2278         ieee80211_txq_teardown_flows(local);
2279
2280         mutex_lock(&local->iflist_mtx);
2281         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
2282                 list_del(&sdata->list);
2283
2284                 if (sdata->dev)
2285                         unregister_netdevice_queue(sdata->dev, &unreg_list);
2286                 else
2287                         list_add(&sdata->list, &wdev_list);
2288         }
2289         mutex_unlock(&local->iflist_mtx);
2290
2291         unregister_netdevice_many(&unreg_list);
2292
2293         wiphy_lock(local->hw.wiphy);
2294         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2295                 list_del(&sdata->list);
2296                 cfg80211_unregister_wdev(&sdata->wdev);
2297                 kfree(sdata);
2298         }
2299         wiphy_unlock(local->hw.wiphy);
2300 }
2301
2302 static int netdev_notify(struct notifier_block *nb,
2303                          unsigned long state, void *ptr)
2304 {
2305         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2306         struct ieee80211_sub_if_data *sdata;
2307
2308         if (state != NETDEV_CHANGENAME)
2309                 return NOTIFY_DONE;
2310
2311         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2312                 return NOTIFY_DONE;
2313
2314         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2315                 return NOTIFY_DONE;
2316
2317         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2318         memcpy(sdata->name, dev->name, IFNAMSIZ);
2319         ieee80211_debugfs_rename_netdev(sdata);
2320
2321         return NOTIFY_OK;
2322 }
2323
2324 static struct notifier_block mac80211_netdev_notifier = {
2325         .notifier_call = netdev_notify,
2326 };
2327
2328 int ieee80211_iface_init(void)
2329 {
2330         return register_netdevice_notifier(&mac80211_netdev_notifier);
2331 }
2332
2333 void ieee80211_iface_exit(void)
2334 {
2335         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2336 }
2337
2338 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2339 {
2340         if (sdata->vif.type == NL80211_IFTYPE_AP)
2341                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2342         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2343                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2344 }
2345
2346 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2347 {
2348         if (sdata->vif.type == NL80211_IFTYPE_AP)
2349                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2350         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2351                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2352 }