net/mac80211/iface.c

   1 // SPDX-License-Identifier: GPL-2.0-only
   2 /*
   3  * Interface handling
   4  *
   5  * Copyright 2002-2005, Instant802 Networks, Inc.
   6  * Copyright 2005-2006, Devicescape Software, Inc.
   7  * Copyright (c) 2006 Jiri Benc <jbenc@suse.cz>
   8  * Copyright 2008, Johannes Berg <johannes@sipsolutions.net>
   9  * Copyright 2013-2014  Intel Mobile Communications GmbH
  10  * Copyright (c) 2016        Intel Deutschland GmbH
  11  * Copyright (C) 2018-2022 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 const struct net_device_ops ieee80211_dataif_ops = {
 817         .ndo_open               = ieee80211_open,
 818         .ndo_stop               = ieee80211_stop,
 819         .ndo_uninit             = ieee80211_uninit,
 820         .ndo_start_xmit         = ieee80211_subif_start_xmit,
 821         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 822         .ndo_set_mac_address    = ieee80211_change_mac,
 823         .ndo_get_stats64        = ieee80211_get_stats64,
 824 };
 825
 826 static u16 ieee80211_monitor_select_queue(struct net_device *dev,
 827                                           struct sk_buff *skb,
 828                                           struct net_device *sb_dev)
 829 {
 830         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
 831         struct ieee80211_local *local = sdata->local;
 832         struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
 833         struct ieee80211_hdr *hdr;
 834         int len_rthdr;
 835
 836         if (local->hw.queues < IEEE80211_NUM_ACS)
 837                 return 0;
 838
 839         /* reset flags and info before parsing radiotap header */
 840         memset(info, 0, sizeof(*info));
 841
 842         if (!ieee80211_parse_tx_radiotap(skb, dev))
 843                 return 0; /* doesn't matter, frame will be dropped */
 844
 845         len_rthdr = ieee80211_get_radiotap_len(skb->data);
 846         hdr = (struct ieee80211_hdr *)(skb->data + len_rthdr);
 847         if (skb->len < len_rthdr + 2 ||
 848             skb->len < len_rthdr + ieee80211_hdrlen(hdr->frame_control))
 849                 return 0; /* doesn't matter, frame will be dropped */
 850
 851         return ieee80211_select_queue_80211(sdata, skb, hdr);
 852 }
 853
 854 static const struct net_device_ops ieee80211_monitorif_ops = {
 855         .ndo_open               = ieee80211_open,
 856         .ndo_stop               = ieee80211_stop,
 857         .ndo_uninit             = ieee80211_uninit,
 858         .ndo_start_xmit         = ieee80211_monitor_start_xmit,
 859         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 860         .ndo_set_mac_address    = ieee80211_change_mac,
 861         .ndo_select_queue       = ieee80211_monitor_select_queue,
 862         .ndo_get_stats64        = ieee80211_get_stats64,
 863 };
 864
 865 static int ieee80211_netdev_fill_forward_path(struct net_device_path_ctx *ctx,
 866                                               struct net_device_path *path)
 867 {
 868         struct ieee80211_sub_if_data *sdata;
 869         struct ieee80211_local *local;
 870         struct sta_info *sta;
 871         int ret = -ENOENT;
 872
 873         sdata = IEEE80211_DEV_TO_SUB_IF(ctx->dev);
 874         local = sdata->local;
 875
 876         if (!local->ops->net_fill_forward_path)
 877                 return -EOPNOTSUPP;
 878
 879         rcu_read_lock();
 880         switch (sdata->vif.type) {
 881         case NL80211_IFTYPE_AP_VLAN:
 882                 sta = rcu_dereference(sdata->u.vlan.sta);
 883                 if (sta)
 884                         break;
 885                 if (sdata->wdev.use_4addr)
 886                         goto out;
 887                 if (is_multicast_ether_addr(ctx->daddr))
 888                         goto out;
 889                 sta = sta_info_get_bss(sdata, ctx->daddr);
 890                 break;
 891         case NL80211_IFTYPE_AP:
 892                 if (is_multicast_ether_addr(ctx->daddr))
 893                         goto out;
 894                 sta = sta_info_get(sdata, ctx->daddr);
 895                 break;
 896         case NL80211_IFTYPE_STATION:
 897                 if (sdata->wdev.wiphy->flags & WIPHY_FLAG_SUPPORTS_TDLS) {
 898                         sta = sta_info_get(sdata, ctx->daddr);
 899                         if (sta && test_sta_flag(sta, WLAN_STA_TDLS_PEER)) {
 900                                 if (!test_sta_flag(sta, WLAN_STA_TDLS_PEER_AUTH))
 901                                         goto out;
 902
 903                                 break;
 904                         }
 905                 }
 906
 907                 sta = sta_info_get(sdata, sdata->deflink.u.mgd.bssid);
 908                 break;
 909         default:
 910                 goto out;
 911         }
 912
 913         if (!sta)
 914                 goto out;
 915
 916         ret = drv_net_fill_forward_path(local, sdata, &sta->sta, ctx, path);
 917 out:
 918         rcu_read_unlock();
 919
 920         return ret;
 921 }
 922
 923 static const struct net_device_ops ieee80211_dataif_8023_ops = {
 924         .ndo_open               = ieee80211_open,
 925         .ndo_stop               = ieee80211_stop,
 926         .ndo_uninit             = ieee80211_uninit,
 927         .ndo_start_xmit         = ieee80211_subif_start_xmit_8023,
 928         .ndo_set_rx_mode        = ieee80211_set_multicast_list,
 929         .ndo_set_mac_address    = ieee80211_change_mac,
 930         .ndo_get_stats64        = ieee80211_get_stats64,
 931         .ndo_fill_forward_path  = ieee80211_netdev_fill_forward_path,
 932 };
 933
 934 static bool ieee80211_iftype_supports_hdr_offload(enum nl80211_iftype iftype)
 935 {
 936         switch (iftype) {
 937         /* P2P GO and client are mapped to AP/STATION types */
 938         case NL80211_IFTYPE_AP:
 939         case NL80211_IFTYPE_STATION:
 940                 return true;
 941         default:
 942                 return false;
 943         }
 944 }
 945
 946 static bool ieee80211_set_sdata_offload_flags(struct ieee80211_sub_if_data *sdata)
 947 {
 948         struct ieee80211_local *local = sdata->local;
 949         u32 flags;
 950
 951         flags = sdata->vif.offload_flags;
 952
 953         if (ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) &&
 954             ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
 955                 flags |= IEEE80211_OFFLOAD_ENCAP_ENABLED;
 956
 957                 if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_FRAG) &&
 958                     local->hw.wiphy->frag_threshold != (u32)-1)
 959                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 960
 961                 if (local->monitors)
 962                         flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 963         } else {
 964                 flags &= ~IEEE80211_OFFLOAD_ENCAP_ENABLED;
 965         }
 966
 967         if (ieee80211_hw_check(&local->hw, SUPPORTS_RX_DECAP_OFFLOAD) &&
 968             ieee80211_iftype_supports_hdr_offload(sdata->vif.type)) {
 969                 flags |= IEEE80211_OFFLOAD_DECAP_ENABLED;
 970
 971                 if (local->monitors &&
 972                     !ieee80211_hw_check(&local->hw, SUPPORTS_CONC_MON_RX_DECAP))
 973                         flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
 974         } else {
 975                 flags &= ~IEEE80211_OFFLOAD_DECAP_ENABLED;
 976         }
 977
 978         if (sdata->vif.offload_flags == flags)
 979                 return false;
 980
 981         sdata->vif.offload_flags = flags;
 982         ieee80211_check_fast_rx_iface(sdata);
 983         return true;
 984 }
 985
 986 static void ieee80211_set_vif_encap_ops(struct ieee80211_sub_if_data *sdata)
 987 {
 988         struct ieee80211_local *local = sdata->local;
 989         struct ieee80211_sub_if_data *bss = sdata;
 990         bool enabled;
 991
 992         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
 993                 if (!sdata->bss)
 994                         return;
 995
 996                 bss = container_of(sdata->bss, struct ieee80211_sub_if_data, u.ap);
 997         }
 998
 999         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD) ||
1000             !ieee80211_iftype_supports_hdr_offload(bss->vif.type))
1001                 return;
1002
1003         enabled = bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_ENABLED;
1004         if (sdata->wdev.use_4addr &&
1005             !(bss->vif.offload_flags & IEEE80211_OFFLOAD_ENCAP_4ADDR))
1006                 enabled = false;
1007
1008         sdata->dev->netdev_ops = enabled ? &ieee80211_dataif_8023_ops :
1009                                            &ieee80211_dataif_ops;
1010 }
1011
1012 static void ieee80211_recalc_sdata_offload(struct ieee80211_sub_if_data *sdata)
1013 {
1014         struct ieee80211_local *local = sdata->local;
1015         struct ieee80211_sub_if_data *vsdata;
1016
1017         if (ieee80211_set_sdata_offload_flags(sdata)) {
1018                 drv_update_vif_offload(local, sdata);
1019                 ieee80211_set_vif_encap_ops(sdata);
1020         }
1021
1022         list_for_each_entry(vsdata, &local->interfaces, list) {
1023                 if (vsdata->vif.type != NL80211_IFTYPE_AP_VLAN ||
1024                     vsdata->bss != &sdata->u.ap)
1025                         continue;
1026
1027                 ieee80211_set_vif_encap_ops(vsdata);
1028         }
1029 }
1030
1031 void ieee80211_recalc_offload(struct ieee80211_local *local)
1032 {
1033         struct ieee80211_sub_if_data *sdata;
1034
1035         if (!ieee80211_hw_check(&local->hw, SUPPORTS_TX_ENCAP_OFFLOAD))
1036                 return;
1037
1038         mutex_lock(&local->iflist_mtx);
1039
1040         list_for_each_entry(sdata, &local->interfaces, list) {
1041                 if (!ieee80211_sdata_running(sdata))
1042                         continue;
1043
1044                 ieee80211_recalc_sdata_offload(sdata);
1045         }
1046
1047         mutex_unlock(&local->iflist_mtx);
1048 }
1049
1050 void ieee80211_adjust_monitor_flags(struct ieee80211_sub_if_data *sdata,
1051                                     const int offset)
1052 {
1053         struct ieee80211_local *local = sdata->local;
1054         u32 flags = sdata->u.mntr.flags;
1055
1056 #define ADJUST(_f, _s)  do {                                    \
1057         if (flags & MONITOR_FLAG_##_f)                          \
1058                 local->fif_##_s += offset;                      \
1059         } while (0)
1060
1061         ADJUST(FCSFAIL, fcsfail);
1062         ADJUST(PLCPFAIL, plcpfail);
1063         ADJUST(CONTROL, control);
1064         ADJUST(CONTROL, pspoll);
1065         ADJUST(OTHER_BSS, other_bss);
1066
1067 #undef ADJUST
1068 }
1069
1070 static void ieee80211_set_default_queues(struct ieee80211_sub_if_data *sdata)
1071 {
1072         struct ieee80211_local *local = sdata->local;
1073         int i;
1074
1075         for (i = 0; i < IEEE80211_NUM_ACS; i++) {
1076                 if (ieee80211_hw_check(&local->hw, QUEUE_CONTROL))
1077                         sdata->vif.hw_queue[i] = IEEE80211_INVAL_HW_QUEUE;
1078                 else if (local->hw.queues >= IEEE80211_NUM_ACS)
1079                         sdata->vif.hw_queue[i] = i;
1080                 else
1081                         sdata->vif.hw_queue[i] = 0;
1082         }
1083         sdata->vif.cab_queue = IEEE80211_INVAL_HW_QUEUE;
1084 }
1085
1086 static void ieee80211_sdata_init(struct ieee80211_local *local,
1087                                  struct ieee80211_sub_if_data *sdata)
1088 {
1089         sdata->local = local;
1090
1091         /*
1092          * Initialize the default link, so we can use link_id 0 for non-MLD,
1093          * and that continues to work for non-MLD-aware drivers that use just
1094          * vif.bss_conf instead of vif.link_conf.
1095          *
1096          * Note that we never change this, so if link ID 0 isn't used in an
1097          * MLD connection, we get a separate allocation for it.
1098          */
1099         ieee80211_link_init(sdata, -1, &sdata->deflink, &sdata->vif.bss_conf);
1100 }
1101
1102 int ieee80211_add_virtual_monitor(struct ieee80211_local *local)
1103 {
1104         struct ieee80211_sub_if_data *sdata;
1105         int ret;
1106
1107         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1108                 return 0;
1109
1110         ASSERT_RTNL();
1111         lockdep_assert_wiphy(local->hw.wiphy);
1112
1113         if (local->monitor_sdata)
1114                 return 0;
1115
1116         sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size, GFP_KERNEL);
1117         if (!sdata)
1118                 return -ENOMEM;
1119
1120         /* set up data */
1121         sdata->vif.type = NL80211_IFTYPE_MONITOR;
1122         snprintf(sdata->name, IFNAMSIZ, "%s-monitor",
1123                  wiphy_name(local->hw.wiphy));
1124         sdata->wdev.iftype = NL80211_IFTYPE_MONITOR;
1125
1126         ieee80211_sdata_init(local, sdata);
1127
1128         ieee80211_set_default_queues(sdata);
1129
1130         ret = drv_add_interface(local, sdata);
1131         if (WARN_ON(ret)) {
1132                 /* ok .. stupid driver, it asked for this! */
1133                 kfree(sdata);
1134                 return ret;
1135         }
1136
1137         set_bit(SDATA_STATE_RUNNING, &sdata->state);
1138
1139         ret = ieee80211_check_queues(sdata, NL80211_IFTYPE_MONITOR);
1140         if (ret) {
1141                 kfree(sdata);
1142                 return ret;
1143         }
1144
1145         mutex_lock(&local->iflist_mtx);
1146         rcu_assign_pointer(local->monitor_sdata, sdata);
1147         mutex_unlock(&local->iflist_mtx);
1148
1149         mutex_lock(&local->mtx);
1150         ret = ieee80211_link_use_channel(&sdata->deflink, &local->monitor_chandef,
1151                                          IEEE80211_CHANCTX_EXCLUSIVE);
1152         mutex_unlock(&local->mtx);
1153         if (ret) {
1154                 mutex_lock(&local->iflist_mtx);
1155                 RCU_INIT_POINTER(local->monitor_sdata, NULL);
1156                 mutex_unlock(&local->iflist_mtx);
1157                 synchronize_net();
1158                 drv_remove_interface(local, sdata);
1159                 kfree(sdata);
1160                 return ret;
1161         }
1162
1163         skb_queue_head_init(&sdata->skb_queue);
1164         skb_queue_head_init(&sdata->status_queue);
1165         INIT_WORK(&sdata->work, ieee80211_iface_work);
1166
1167         return 0;
1168 }
1169
1170 void ieee80211_del_virtual_monitor(struct ieee80211_local *local)
1171 {
1172         struct ieee80211_sub_if_data *sdata;
1173
1174         if (!ieee80211_hw_check(&local->hw, WANT_MONITOR_VIF))
1175                 return;
1176
1177         ASSERT_RTNL();
1178         lockdep_assert_wiphy(local->hw.wiphy);
1179
1180         mutex_lock(&local->iflist_mtx);
1181
1182         sdata = rcu_dereference_protected(local->monitor_sdata,
1183                                           lockdep_is_held(&local->iflist_mtx));
1184         if (!sdata) {
1185                 mutex_unlock(&local->iflist_mtx);
1186                 return;
1187         }
1188
1189         RCU_INIT_POINTER(local->monitor_sdata, NULL);
1190         mutex_unlock(&local->iflist_mtx);
1191
1192         synchronize_net();
1193
1194         mutex_lock(&local->mtx);
1195         ieee80211_link_release_channel(&sdata->deflink);
1196         mutex_unlock(&local->mtx);
1197
1198         drv_remove_interface(local, sdata);
1199
1200         kfree(sdata);
1201 }
1202
1203 /*
1204  * NOTE: Be very careful when changing this function, it must NOT return
1205  * an error on interface type changes that have been pre-checked, so most
1206  * checks should be in ieee80211_check_concurrent_iface.
1207  */
1208 int ieee80211_do_open(struct wireless_dev *wdev, bool coming_up)
1209 {
1210         struct ieee80211_sub_if_data *sdata = IEEE80211_WDEV_TO_SUB_IF(wdev);
1211         struct net_device *dev = wdev->netdev;
1212         struct ieee80211_local *local = sdata->local;
1213         u32 changed = 0;
1214         int res;
1215         u32 hw_reconf_flags = 0;
1216
1217         switch (sdata->vif.type) {
1218         case NL80211_IFTYPE_AP_VLAN: {
1219                 struct ieee80211_sub_if_data *master;
1220
1221                 if (!sdata->bss)
1222                         return -ENOLINK;
1223
1224                 mutex_lock(&local->mtx);
1225                 list_add(&sdata->u.vlan.list, &sdata->bss->vlans);
1226                 mutex_unlock(&local->mtx);
1227
1228                 master = container_of(sdata->bss,
1229                                       struct ieee80211_sub_if_data, u.ap);
1230                 sdata->control_port_protocol =
1231                         master->control_port_protocol;
1232                 sdata->control_port_no_encrypt =
1233                         master->control_port_no_encrypt;
1234                 sdata->control_port_over_nl80211 =
1235                         master->control_port_over_nl80211;
1236                 sdata->control_port_no_preauth =
1237                         master->control_port_no_preauth;
1238                 sdata->vif.cab_queue = master->vif.cab_queue;
1239                 memcpy(sdata->vif.hw_queue, master->vif.hw_queue,
1240                        sizeof(sdata->vif.hw_queue));
1241                 sdata->vif.bss_conf.chandef = master->vif.bss_conf.chandef;
1242
1243                 mutex_lock(&local->key_mtx);
1244                 sdata->crypto_tx_tailroom_needed_cnt +=
1245                         master->crypto_tx_tailroom_needed_cnt;
1246                 mutex_unlock(&local->key_mtx);
1247
1248                 break;
1249                 }
1250         case NL80211_IFTYPE_AP:
1251                 sdata->bss = &sdata->u.ap;
1252                 break;
1253         case NL80211_IFTYPE_MESH_POINT:
1254         case NL80211_IFTYPE_STATION:
1255         case NL80211_IFTYPE_MONITOR:
1256         case NL80211_IFTYPE_ADHOC:
1257         case NL80211_IFTYPE_P2P_DEVICE:
1258         case NL80211_IFTYPE_OCB:
1259         case NL80211_IFTYPE_NAN:
1260                 /* no special treatment */
1261                 break;
1262         case NL80211_IFTYPE_UNSPECIFIED:
1263         case NUM_NL80211_IFTYPES:
1264         case NL80211_IFTYPE_P2P_CLIENT:
1265         case NL80211_IFTYPE_P2P_GO:
1266         case NL80211_IFTYPE_WDS:
1267                 /* cannot happen */
1268                 WARN_ON(1);
1269                 break;
1270         }
1271
1272         if (local->open_count == 0) {
1273                 res = drv_start(local);
1274                 if (res)
1275                         goto err_del_bss;
1276                 /* we're brought up, everything changes */
1277                 hw_reconf_flags = ~0;
1278                 ieee80211_led_radio(local, true);
1279                 ieee80211_mod_tpt_led_trig(local,
1280                                            IEEE80211_TPT_LEDTRIG_FL_RADIO, 0);
1281         }
1282
1283         /*
1284          * Copy the hopefully now-present MAC address to
1285          * this interface, if it has the special null one.
1286          */
1287         if (dev && is_zero_ether_addr(dev->dev_addr)) {
1288                 eth_hw_addr_set(dev, local->hw.wiphy->perm_addr);
1289                 memcpy(dev->perm_addr, dev->dev_addr, ETH_ALEN);
1290
1291                 if (!is_valid_ether_addr(dev->dev_addr)) {
1292                         res = -EADDRNOTAVAIL;
1293                         goto err_stop;
1294                 }
1295         }
1296
1297         switch (sdata->vif.type) {
1298         case NL80211_IFTYPE_AP_VLAN:
1299                 /* no need to tell driver, but set carrier and chanctx */
1300                 if (sdata->bss->active) {
1301                         ieee80211_link_vlan_copy_chanctx(&sdata->deflink);
1302                         netif_carrier_on(dev);
1303                         ieee80211_set_vif_encap_ops(sdata);
1304                 } else {
1305                         netif_carrier_off(dev);
1306                 }
1307                 break;
1308         case NL80211_IFTYPE_MONITOR:
1309                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES) {
1310                         local->cooked_mntrs++;
1311                         break;
1312                 }
1313
1314                 if (sdata->u.mntr.flags & MONITOR_FLAG_ACTIVE) {
1315                         res = drv_add_interface(local, sdata);
1316                         if (res)
1317                                 goto err_stop;
1318                 } else if (local->monitors == 0 && local->open_count == 0) {
1319                         res = ieee80211_add_virtual_monitor(local);
1320                         if (res)
1321                                 goto err_stop;
1322                 }
1323
1324                 /* must be before the call to ieee80211_configure_filter */
1325                 local->monitors++;
1326                 if (local->monitors == 1) {
1327                         local->hw.conf.flags |= IEEE80211_CONF_MONITOR;
1328                         hw_reconf_flags |= IEEE80211_CONF_CHANGE_MONITOR;
1329                 }
1330
1331                 ieee80211_adjust_monitor_flags(sdata, 1);
1332                 ieee80211_configure_filter(local);
1333                 ieee80211_recalc_offload(local);
1334                 mutex_lock(&local->mtx);
1335                 ieee80211_recalc_idle(local);
1336                 mutex_unlock(&local->mtx);
1337
1338                 netif_carrier_on(dev);
1339                 break;
1340         default:
1341                 if (coming_up) {
1342                         ieee80211_del_virtual_monitor(local);
1343                         ieee80211_set_sdata_offload_flags(sdata);
1344
1345                         res = drv_add_interface(local, sdata);
1346                         if (res)
1347                                 goto err_stop;
1348
1349                         ieee80211_set_vif_encap_ops(sdata);
1350                         res = ieee80211_check_queues(sdata,
1351                                 ieee80211_vif_type_p2p(&sdata->vif));
1352                         if (res)
1353                                 goto err_del_interface;
1354                 }
1355
1356                 if (sdata->vif.type == NL80211_IFTYPE_AP) {
1357                         local->fif_pspoll++;
1358                         local->fif_probe_req++;
1359
1360                         ieee80211_configure_filter(local);
1361                 } else if (sdata->vif.type == NL80211_IFTYPE_ADHOC) {
1362                         local->fif_probe_req++;
1363                 }
1364
1365                 if (sdata->vif.probe_req_reg)
1366                         drv_config_iface_filter(local, sdata,
1367                                                 FIF_PROBE_REQ,
1368                                                 FIF_PROBE_REQ);
1369
1370                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE &&
1371                     sdata->vif.type != NL80211_IFTYPE_NAN)
1372                         changed |= ieee80211_reset_erp_info(sdata);
1373                 ieee80211_link_info_change_notify(sdata, &sdata->deflink,
1374                                                   changed);
1375
1376                 switch (sdata->vif.type) {
1377                 case NL80211_IFTYPE_STATION:
1378                 case NL80211_IFTYPE_ADHOC:
1379                 case NL80211_IFTYPE_AP:
1380                 case NL80211_IFTYPE_MESH_POINT:
1381                 case NL80211_IFTYPE_OCB:
1382                         netif_carrier_off(dev);
1383                         break;
1384                 case NL80211_IFTYPE_P2P_DEVICE:
1385                 case NL80211_IFTYPE_NAN:
1386                         break;
1387                 default:
1388                         /* not reached */
1389                         WARN_ON(1);
1390                 }
1391
1392                 /*
1393                  * Set default queue parameters so drivers don't
1394                  * need to initialise the hardware if the hardware
1395                  * doesn't start up with sane defaults.
1396                  * Enable QoS for anything but station interfaces.
1397                  */
1398                 ieee80211_set_wmm_default(&sdata->deflink, true,
1399                         sdata->vif.type != NL80211_IFTYPE_STATION);
1400         }
1401
1402         switch (sdata->vif.type) {
1403         case NL80211_IFTYPE_P2P_DEVICE:
1404                 rcu_assign_pointer(local->p2p_sdata, sdata);
1405                 break;
1406         case NL80211_IFTYPE_MONITOR:
1407                 if (sdata->u.mntr.flags & MONITOR_FLAG_COOK_FRAMES)
1408                         break;
1409                 list_add_tail_rcu(&sdata->u.mntr.list, &local->mon_list);
1410                 break;
1411         default:
1412                 break;
1413         }
1414
1415         /*
1416          * set_multicast_list will be invoked by the networking core
1417          * which will check whether any increments here were done in
1418          * error and sync them down to the hardware as filter flags.
1419          */
1420         if (sdata->flags & IEEE80211_SDATA_ALLMULTI)
1421                 atomic_inc(&local->iff_allmultis);
1422
1423         if (coming_up)
1424                 local->open_count++;
1425
1426         if (hw_reconf_flags)
1427                 ieee80211_hw_config(local, hw_reconf_flags);
1428
1429         ieee80211_recalc_ps(local);
1430
1431         set_bit(SDATA_STATE_RUNNING, &sdata->state);
1432
1433         return 0;
1434  err_del_interface:
1435         drv_remove_interface(local, sdata);
1436  err_stop:
1437         if (!local->open_count)
1438                 drv_stop(local);
1439  err_del_bss:
1440         sdata->bss = NULL;
1441         if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN) {
1442                 mutex_lock(&local->mtx);
1443                 list_del(&sdata->u.vlan.list);
1444                 mutex_unlock(&local->mtx);
1445         }
1446         /* might already be clear but that doesn't matter */
1447         clear_bit(SDATA_STATE_RUNNING, &sdata->state);
1448         return res;
1449 }
1450
1451 static void ieee80211_if_free(struct net_device *dev)
1452 {
1453         free_percpu(dev->tstats);
1454 }
1455
1456 static void ieee80211_if_setup(struct net_device *dev)
1457 {
1458         ether_setup(dev);
1459         dev->priv_flags &= ~IFF_TX_SKB_SHARING;
1460         dev->priv_flags |= IFF_NO_QUEUE;
1461         dev->netdev_ops = &ieee80211_dataif_ops;
1462         dev->needs_free_netdev = true;
1463         dev->priv_destructor = ieee80211_if_free;
1464 }
1465
1466 static void ieee80211_iface_process_skb(struct ieee80211_local *local,
1467                                         struct ieee80211_sub_if_data *sdata,
1468                                         struct sk_buff *skb)
1469 {
1470         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1471
1472         if (ieee80211_is_action(mgmt->frame_control) &&
1473             mgmt->u.action.category == WLAN_CATEGORY_BACK) {
1474                 struct sta_info *sta;
1475                 int len = skb->len;
1476
1477                 mutex_lock(&local->sta_mtx);
1478                 sta = sta_info_get_bss(sdata, mgmt->sa);
1479                 if (sta) {
1480                         switch (mgmt->u.action.u.addba_req.action_code) {
1481                         case WLAN_ACTION_ADDBA_REQ:
1482                                 ieee80211_process_addba_request(local, sta,
1483                                                                 mgmt, len);
1484                                 break;
1485                         case WLAN_ACTION_ADDBA_RESP:
1486                                 ieee80211_process_addba_resp(local, sta,
1487                                                              mgmt, len);
1488                                 break;
1489                         case WLAN_ACTION_DELBA:
1490                                 ieee80211_process_delba(sdata, sta,
1491                                                         mgmt, len);
1492                                 break;
1493                         default:
1494                                 WARN_ON(1);
1495                                 break;
1496                         }
1497                 }
1498                 mutex_unlock(&local->sta_mtx);
1499         } else if (ieee80211_is_action(mgmt->frame_control) &&
1500                    mgmt->u.action.category == WLAN_CATEGORY_VHT) {
1501                 switch (mgmt->u.action.u.vht_group_notif.action_code) {
1502                 case WLAN_VHT_ACTION_OPMODE_NOTIF: {
1503                         struct ieee80211_rx_status *status;
1504                         enum nl80211_band band;
1505                         struct sta_info *sta;
1506                         u8 opmode;
1507
1508                         status = IEEE80211_SKB_RXCB(skb);
1509                         band = status->band;
1510                         opmode = mgmt->u.action.u.vht_opmode_notif.operating_mode;
1511
1512                         mutex_lock(&local->sta_mtx);
1513                         sta = sta_info_get_bss(sdata, mgmt->sa);
1514
1515                         if (sta)
1516                                 ieee80211_vht_handle_opmode(sdata,
1517                                                             &sta->deflink,
1518                                                             opmode, band);
1519
1520                         mutex_unlock(&local->sta_mtx);
1521                         break;
1522                 }
1523                 case WLAN_VHT_ACTION_GROUPID_MGMT:
1524                         ieee80211_process_mu_groups(sdata, &sdata->deflink,
1525                                                     mgmt);
1526                         break;
1527                 default:
1528                         WARN_ON(1);
1529                         break;
1530                 }
1531         } else if (ieee80211_is_action(mgmt->frame_control) &&
1532                    mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1533                 switch (mgmt->u.action.u.s1g.action_code) {
1534                 case WLAN_S1G_TWT_TEARDOWN:
1535                 case WLAN_S1G_TWT_SETUP:
1536                         ieee80211_s1g_rx_twt_action(sdata, skb);
1537                         break;
1538                 default:
1539                         break;
1540                 }
1541         } else if (ieee80211_is_ext(mgmt->frame_control)) {
1542                 if (sdata->vif.type == NL80211_IFTYPE_STATION)
1543                         ieee80211_sta_rx_queued_ext(sdata, skb);
1544                 else
1545                         WARN_ON(1);
1546         } else if (ieee80211_is_data_qos(mgmt->frame_control)) {
1547                 struct ieee80211_hdr *hdr = (void *)mgmt;
1548                 struct sta_info *sta;
1549
1550                 /*
1551                  * So the frame isn't mgmt, but frame_control
1552                  * is at the right place anyway, of course, so
1553                  * the if statement is correct.
1554                  *
1555                  * Warn if we have other data frame types here,
1556                  * they must not get here.
1557                  */
1558                 WARN_ON(hdr->frame_control &
1559                                 cpu_to_le16(IEEE80211_STYPE_NULLFUNC));
1560                 WARN_ON(!(hdr->seq_ctrl &
1561                                 cpu_to_le16(IEEE80211_SCTL_FRAG)));
1562                 /*
1563                  * This was a fragment of a frame, received while
1564                  * a block-ack session was active. That cannot be
1565                  * right, so terminate the session.
1566                  */
1567                 mutex_lock(&local->sta_mtx);
1568                 sta = sta_info_get_bss(sdata, mgmt->sa);
1569                 if (sta) {
1570                         u16 tid = ieee80211_get_tid(hdr);
1571
1572                         __ieee80211_stop_rx_ba_session(
1573                                 sta, tid, WLAN_BACK_RECIPIENT,
1574                                 WLAN_REASON_QSTA_REQUIRE_SETUP,
1575                                 true);
1576                 }
1577                 mutex_unlock(&local->sta_mtx);
1578         } else switch (sdata->vif.type) {
1579         case NL80211_IFTYPE_STATION:
1580                 ieee80211_sta_rx_queued_mgmt(sdata, skb);
1581                 break;
1582         case NL80211_IFTYPE_ADHOC:
1583                 ieee80211_ibss_rx_queued_mgmt(sdata, skb);
1584                 break;
1585         case NL80211_IFTYPE_MESH_POINT:
1586                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1587                         break;
1588                 ieee80211_mesh_rx_queued_mgmt(sdata, skb);
1589                 break;
1590         default:
1591                 WARN(1, "frame for unexpected interface type");
1592                 break;
1593         }
1594 }
1595
1596 static void ieee80211_iface_process_status(struct ieee80211_sub_if_data *sdata,
1597                                            struct sk_buff *skb)
1598 {
1599         struct ieee80211_mgmt *mgmt = (void *)skb->data;
1600
1601         if (ieee80211_is_action(mgmt->frame_control) &&
1602             mgmt->u.action.category == WLAN_CATEGORY_S1G) {
1603                 switch (mgmt->u.action.u.s1g.action_code) {
1604                 case WLAN_S1G_TWT_TEARDOWN:
1605                 case WLAN_S1G_TWT_SETUP:
1606                         ieee80211_s1g_status_twt_action(sdata, skb);
1607                         break;
1608                 default:
1609                         break;
1610                 }
1611         }
1612 }
1613
1614 static void ieee80211_iface_work(struct work_struct *work)
1615 {
1616         struct ieee80211_sub_if_data *sdata =
1617                 container_of(work, struct ieee80211_sub_if_data, work);
1618         struct ieee80211_local *local = sdata->local;
1619         struct sk_buff *skb;
1620
1621         if (!ieee80211_sdata_running(sdata))
1622                 return;
1623
1624         if (test_bit(SCAN_SW_SCANNING, &local->scanning))
1625                 return;
1626
1627         if (!ieee80211_can_run_worker(local))
1628                 return;
1629
1630         /* first process frames */
1631         while ((skb = skb_dequeue(&sdata->skb_queue))) {
1632                 kcov_remote_start_common(skb_get_kcov_handle(skb));
1633
1634                 if (skb->protocol == cpu_to_be16(ETH_P_TDLS))
1635                         ieee80211_process_tdls_channel_switch(sdata, skb);
1636                 else
1637                         ieee80211_iface_process_skb(local, sdata, skb);
1638
1639                 kfree_skb(skb);
1640                 kcov_remote_stop();
1641         }
1642
1643         /* process status queue */
1644         while ((skb = skb_dequeue(&sdata->status_queue))) {
1645                 kcov_remote_start_common(skb_get_kcov_handle(skb));
1646
1647                 ieee80211_iface_process_status(sdata, skb);
1648                 kfree_skb(skb);
1649
1650                 kcov_remote_stop();
1651         }
1652
1653         /* then other type-dependent work */
1654         switch (sdata->vif.type) {
1655         case NL80211_IFTYPE_STATION:
1656                 ieee80211_sta_work(sdata);
1657                 break;
1658         case NL80211_IFTYPE_ADHOC:
1659                 ieee80211_ibss_work(sdata);
1660                 break;
1661         case NL80211_IFTYPE_MESH_POINT:
1662                 if (!ieee80211_vif_is_mesh(&sdata->vif))
1663                         break;
1664                 ieee80211_mesh_work(sdata);
1665                 break;
1666         case NL80211_IFTYPE_OCB:
1667                 ieee80211_ocb_work(sdata);
1668                 break;
1669         default:
1670                 break;
1671         }
1672 }
1673
1674 static void ieee80211_recalc_smps_work(struct work_struct *work)
1675 {
1676         struct ieee80211_sub_if_data *sdata =
1677                 container_of(work, struct ieee80211_sub_if_data, recalc_smps);
1678
1679         ieee80211_recalc_smps(sdata, &sdata->deflink);
1680 }
1681
1682 static void ieee80211_activate_links_work(struct work_struct *work)
1683 {
1684         struct ieee80211_sub_if_data *sdata =
1685                 container_of(work, struct ieee80211_sub_if_data,
1686                              activate_links_work);
1687
1688         ieee80211_set_active_links(&sdata->vif, sdata->desired_active_links);
1689 }
1690
1691 /*
1692  * Helper function to initialise an interface to a specific type.
1693  */
1694 static void ieee80211_setup_sdata(struct ieee80211_sub_if_data *sdata,
1695                                   enum nl80211_iftype type)
1696 {
1697         static const u8 bssid_wildcard[ETH_ALEN] = {0xff, 0xff, 0xff,
1698                                                     0xff, 0xff, 0xff};
1699
1700         /* clear type-dependent unions */
1701         memset(&sdata->u, 0, sizeof(sdata->u));
1702         memset(&sdata->deflink.u, 0, sizeof(sdata->deflink.u));
1703
1704         /* and set some type-dependent values */
1705         sdata->vif.type = type;
1706         sdata->vif.p2p = false;
1707         sdata->wdev.iftype = type;
1708
1709         sdata->control_port_protocol = cpu_to_be16(ETH_P_PAE);
1710         sdata->control_port_no_encrypt = false;
1711         sdata->control_port_over_nl80211 = false;
1712         sdata->control_port_no_preauth = false;
1713         sdata->vif.cfg.idle = true;
1714         sdata->vif.bss_conf.txpower = INT_MIN; /* unset */
1715
1716         sdata->noack_map = 0;
1717
1718         /* only monitor/p2p-device differ */
1719         if (sdata->dev) {
1720                 sdata->dev->netdev_ops = &ieee80211_dataif_ops;
1721                 sdata->dev->type = ARPHRD_ETHER;
1722         }
1723
1724         skb_queue_head_init(&sdata->skb_queue);
1725         skb_queue_head_init(&sdata->status_queue);
1726         INIT_WORK(&sdata->work, ieee80211_iface_work);
1727         INIT_WORK(&sdata->recalc_smps, ieee80211_recalc_smps_work);
1728         INIT_WORK(&sdata->activate_links_work, ieee80211_activate_links_work);
1729
1730         switch (type) {
1731         case NL80211_IFTYPE_P2P_GO:
1732                 type = NL80211_IFTYPE_AP;
1733                 sdata->vif.type = type;
1734                 sdata->vif.p2p = true;
1735                 fallthrough;
1736         case NL80211_IFTYPE_AP:
1737                 skb_queue_head_init(&sdata->u.ap.ps.bc_buf);
1738                 INIT_LIST_HEAD(&sdata->u.ap.vlans);
1739                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1740                 break;
1741         case NL80211_IFTYPE_P2P_CLIENT:
1742                 type = NL80211_IFTYPE_STATION;
1743                 sdata->vif.type = type;
1744                 sdata->vif.p2p = true;
1745                 fallthrough;
1746         case NL80211_IFTYPE_STATION:
1747                 sdata->vif.bss_conf.bssid = sdata->deflink.u.mgd.bssid;
1748                 ieee80211_sta_setup_sdata(sdata);
1749                 break;
1750         case NL80211_IFTYPE_OCB:
1751                 sdata->vif.bss_conf.bssid = bssid_wildcard;
1752                 ieee80211_ocb_setup_sdata(sdata);
1753                 break;
1754         case NL80211_IFTYPE_ADHOC:
1755                 sdata->vif.bss_conf.bssid = sdata->u.ibss.bssid;
1756                 ieee80211_ibss_setup_sdata(sdata);
1757                 break;
1758         case NL80211_IFTYPE_MESH_POINT:
1759                 if (ieee80211_vif_is_mesh(&sdata->vif))
1760                         ieee80211_mesh_init_sdata(sdata);
1761                 break;
1762         case NL80211_IFTYPE_MONITOR:
1763                 sdata->dev->type = ARPHRD_IEEE80211_RADIOTAP;
1764                 sdata->dev->netdev_ops = &ieee80211_monitorif_ops;
1765                 sdata->u.mntr.flags = MONITOR_FLAG_CONTROL |
1766                                       MONITOR_FLAG_OTHER_BSS;
1767                 break;
1768         case NL80211_IFTYPE_NAN:
1769                 idr_init(&sdata->u.nan.function_inst_ids);
1770                 spin_lock_init(&sdata->u.nan.func_lock);
1771                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1772                 break;
1773         case NL80211_IFTYPE_AP_VLAN:
1774         case NL80211_IFTYPE_P2P_DEVICE:
1775                 sdata->vif.bss_conf.bssid = sdata->vif.addr;
1776                 break;
1777         case NL80211_IFTYPE_UNSPECIFIED:
1778         case NL80211_IFTYPE_WDS:
1779         case NUM_NL80211_IFTYPES:
1780                 WARN_ON(1);
1781                 break;
1782         }
1783
1784         /* need to do this after the switch so vif.type is correct */
1785         ieee80211_link_setup(&sdata->deflink);
1786
1787         ieee80211_debugfs_add_netdev(sdata);
1788 }
1789
1790 static int ieee80211_runtime_change_iftype(struct ieee80211_sub_if_data *sdata,
1791                                            enum nl80211_iftype type)
1792 {
1793         struct ieee80211_local *local = sdata->local;
1794         int ret, err;
1795         enum nl80211_iftype internal_type = type;
1796         bool p2p = false;
1797
1798         ASSERT_RTNL();
1799
1800         if (!local->ops->change_interface)
1801                 return -EBUSY;
1802
1803         /* for now, don't support changing while links exist */
1804         if (sdata->vif.valid_links)
1805                 return -EBUSY;
1806
1807         switch (sdata->vif.type) {
1808         case NL80211_IFTYPE_AP:
1809                 if (!list_empty(&sdata->u.ap.vlans))
1810                         return -EBUSY;
1811                 break;
1812         case NL80211_IFTYPE_STATION:
1813         case NL80211_IFTYPE_ADHOC:
1814         case NL80211_IFTYPE_OCB:
1815                 /*
1816                  * Could maybe also all others here?
1817                  * Just not sure how that interacts
1818                  * with the RX/config path e.g. for
1819                  * mesh.
1820                  */
1821                 break;
1822         default:
1823                 return -EBUSY;
1824         }
1825
1826         switch (type) {
1827         case NL80211_IFTYPE_AP:
1828         case NL80211_IFTYPE_STATION:
1829         case NL80211_IFTYPE_ADHOC:
1830         case NL80211_IFTYPE_OCB:
1831                 /*
1832                  * Could probably support everything
1833                  * but here.
1834                  */
1835                 break;
1836         case NL80211_IFTYPE_P2P_CLIENT:
1837                 p2p = true;
1838                 internal_type = NL80211_IFTYPE_STATION;
1839                 break;
1840         case NL80211_IFTYPE_P2P_GO:
1841                 p2p = true;
1842                 internal_type = NL80211_IFTYPE_AP;
1843                 break;
1844         default:
1845                 return -EBUSY;
1846         }
1847
1848         ret = ieee80211_check_concurrent_iface(sdata, internal_type);
1849         if (ret)
1850                 return ret;
1851
1852         ieee80211_stop_vif_queues(local, sdata,
1853                                   IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1854         /* do_stop will synchronize_rcu() first thing */
1855         ieee80211_do_stop(sdata, false);
1856
1857         ieee80211_teardown_sdata(sdata);
1858
1859         ieee80211_set_sdata_offload_flags(sdata);
1860         ret = drv_change_interface(local, sdata, internal_type, p2p);
1861         if (ret)
1862                 type = ieee80211_vif_type_p2p(&sdata->vif);
1863
1864         /*
1865          * Ignore return value here, there's not much we can do since
1866          * the driver changed the interface type internally already.
1867          * The warnings will hopefully make driver authors fix it :-)
1868          */
1869         ieee80211_check_queues(sdata, type);
1870
1871         ieee80211_setup_sdata(sdata, type);
1872         ieee80211_set_vif_encap_ops(sdata);
1873
1874         err = ieee80211_do_open(&sdata->wdev, false);
1875         WARN(err, "type change: do_open returned %d", err);
1876
1877         ieee80211_wake_vif_queues(local, sdata,
1878                                   IEEE80211_QUEUE_STOP_REASON_IFTYPE_CHANGE);
1879         return ret;
1880 }
1881
1882 int ieee80211_if_change_type(struct ieee80211_sub_if_data *sdata,
1883                              enum nl80211_iftype type)
1884 {
1885         int ret;
1886
1887         ASSERT_RTNL();
1888
1889         if (type == ieee80211_vif_type_p2p(&sdata->vif))
1890                 return 0;
1891
1892         if (ieee80211_sdata_running(sdata)) {
1893                 ret = ieee80211_runtime_change_iftype(sdata, type);
1894                 if (ret)
1895                         return ret;
1896         } else {
1897                 /* Purge and reset type-dependent state. */
1898                 ieee80211_teardown_sdata(sdata);
1899                 ieee80211_setup_sdata(sdata, type);
1900         }
1901
1902         /* reset some values that shouldn't be kept across type changes */
1903         if (type == NL80211_IFTYPE_STATION)
1904                 sdata->u.mgd.use_4addr = false;
1905
1906         return 0;
1907 }
1908
1909 static void ieee80211_assign_perm_addr(struct ieee80211_local *local,
1910                                        u8 *perm_addr, enum nl80211_iftype type)
1911 {
1912         struct ieee80211_sub_if_data *sdata;
1913         u64 mask, start, addr, val, inc;
1914         u8 *m;
1915         u8 tmp_addr[ETH_ALEN];
1916         int i;
1917
1918         /* default ... something at least */
1919         memcpy(perm_addr, local->hw.wiphy->perm_addr, ETH_ALEN);
1920
1921         if (is_zero_ether_addr(local->hw.wiphy->addr_mask) &&
1922             local->hw.wiphy->n_addresses <= 1)
1923                 return;
1924
1925         mutex_lock(&local->iflist_mtx);
1926
1927         switch (type) {
1928         case NL80211_IFTYPE_MONITOR:
1929                 /* doesn't matter */
1930                 break;
1931         case NL80211_IFTYPE_AP_VLAN:
1932                 /* match up with an AP interface */
1933                 list_for_each_entry(sdata, &local->interfaces, list) {
1934                         if (sdata->vif.type != NL80211_IFTYPE_AP)
1935                                 continue;
1936                         memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1937                         break;
1938                 }
1939                 /* keep default if no AP interface present */
1940                 break;
1941         case NL80211_IFTYPE_P2P_CLIENT:
1942         case NL80211_IFTYPE_P2P_GO:
1943                 if (ieee80211_hw_check(&local->hw, P2P_DEV_ADDR_FOR_INTF)) {
1944                         list_for_each_entry(sdata, &local->interfaces, list) {
1945                                 if (sdata->vif.type != NL80211_IFTYPE_P2P_DEVICE)
1946                                         continue;
1947                                 if (!ieee80211_sdata_running(sdata))
1948                                         continue;
1949                                 memcpy(perm_addr, sdata->vif.addr, ETH_ALEN);
1950                                 goto out_unlock;
1951                         }
1952                 }
1953                 fallthrough;
1954         default:
1955                 /* assign a new address if possible -- try n_addresses first */
1956                 for (i = 0; i < local->hw.wiphy->n_addresses; i++) {
1957                         bool used = false;
1958
1959                         list_for_each_entry(sdata, &local->interfaces, list) {
1960                                 if (ether_addr_equal(local->hw.wiphy->addresses[i].addr,
1961                                                      sdata->vif.addr)) {
1962                                         used = true;
1963                                         break;
1964                                 }
1965                         }
1966
1967                         if (!used) {
1968                                 memcpy(perm_addr,
1969                                        local->hw.wiphy->addresses[i].addr,
1970                                        ETH_ALEN);
1971                                 break;
1972                         }
1973                 }
1974
1975                 /* try mask if available */
1976                 if (is_zero_ether_addr(local->hw.wiphy->addr_mask))
1977                         break;
1978
1979                 m = local->hw.wiphy->addr_mask;
1980                 mask =  ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
1981                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
1982                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
1983
1984                 if (__ffs64(mask) + hweight64(mask) != fls64(mask)) {
1985                         /* not a contiguous mask ... not handled now! */
1986                         pr_info("not contiguous\n");
1987                         break;
1988                 }
1989
1990                 /*
1991                  * Pick address of existing interface in case user changed
1992                  * MAC address manually, default to perm_addr.
1993                  */
1994                 m = local->hw.wiphy->perm_addr;
1995                 list_for_each_entry(sdata, &local->interfaces, list) {
1996                         if (sdata->vif.type == NL80211_IFTYPE_MONITOR)
1997                                 continue;
1998                         m = sdata->vif.addr;
1999                         break;
2000                 }
2001                 start = ((u64)m[0] << 5*8) | ((u64)m[1] << 4*8) |
2002                         ((u64)m[2] << 3*8) | ((u64)m[3] << 2*8) |
2003                         ((u64)m[4] << 1*8) | ((u64)m[5] << 0*8);
2004
2005                 inc = 1ULL<<__ffs64(mask);
2006                 val = (start & mask);
2007                 addr = (start & ~mask) | (val & mask);
2008                 do {
2009                         bool used = false;
2010
2011                         tmp_addr[5] = addr >> 0*8;
2012                         tmp_addr[4] = addr >> 1*8;
2013                         tmp_addr[3] = addr >> 2*8;
2014                         tmp_addr[2] = addr >> 3*8;
2015                         tmp_addr[1] = addr >> 4*8;
2016                         tmp_addr[0] = addr >> 5*8;
2017
2018                         val += inc;
2019
2020                         list_for_each_entry(sdata, &local->interfaces, list) {
2021                                 if (ether_addr_equal(tmp_addr, sdata->vif.addr)) {
2022                                         used = true;
2023                                         break;
2024                                 }
2025                         }
2026
2027                         if (!used) {
2028                                 memcpy(perm_addr, tmp_addr, ETH_ALEN);
2029                                 break;
2030                         }
2031                         addr = (start & ~mask) | (val & mask);
2032                 } while (addr != start);
2033
2034                 break;
2035         }
2036
2037  out_unlock:
2038         mutex_unlock(&local->iflist_mtx);
2039 }
2040
2041 int ieee80211_if_add(struct ieee80211_local *local, const char *name,
2042                      unsigned char name_assign_type,
2043                      struct wireless_dev **new_wdev, enum nl80211_iftype type,
2044                      struct vif_params *params)
2045 {
2046         struct net_device *ndev = NULL;
2047         struct ieee80211_sub_if_data *sdata = NULL;
2048         struct txq_info *txqi;
2049         int ret, i;
2050
2051         ASSERT_RTNL();
2052
2053         if (type == NL80211_IFTYPE_P2P_DEVICE || type == NL80211_IFTYPE_NAN) {
2054                 struct wireless_dev *wdev;
2055
2056                 sdata = kzalloc(sizeof(*sdata) + local->hw.vif_data_size,
2057                                 GFP_KERNEL);
2058                 if (!sdata)
2059                         return -ENOMEM;
2060                 wdev = &sdata->wdev;
2061
2062                 sdata->dev = NULL;
2063                 strscpy(sdata->name, name, IFNAMSIZ);
2064                 ieee80211_assign_perm_addr(local, wdev->address, type);
2065                 memcpy(sdata->vif.addr, wdev->address, ETH_ALEN);
2066                 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
2067         } else {
2068                 int size = ALIGN(sizeof(*sdata) + local->hw.vif_data_size,
2069                                  sizeof(void *));
2070                 int txq_size = 0;
2071
2072                 if (type != NL80211_IFTYPE_AP_VLAN &&
2073                     (type != NL80211_IFTYPE_MONITOR ||
2074                      (params->flags & MONITOR_FLAG_ACTIVE)))
2075                         txq_size += sizeof(struct txq_info) +
2076                                     local->hw.txq_data_size;
2077
2078                 ndev = alloc_netdev_mqs(size + txq_size,
2079                                         name, name_assign_type,
2080                                         ieee80211_if_setup, 1, 1);
2081                 if (!ndev)
2082                         return -ENOMEM;
2083
2084                 dev_net_set(ndev, wiphy_net(local->hw.wiphy));
2085
2086                 ndev->tstats = netdev_alloc_pcpu_stats(struct pcpu_sw_netstats);
2087                 if (!ndev->tstats) {
2088                         free_netdev(ndev);
2089                         return -ENOMEM;
2090                 }
2091
2092                 ndev->needed_headroom = local->tx_headroom +
2093                                         4*6 /* four MAC addresses */
2094                                         + 2 + 2 + 2 + 2 /* ctl, dur, seq, qos */
2095                                         + 6 /* mesh */
2096                                         + 8 /* rfc1042/bridge tunnel */
2097                                         - ETH_HLEN /* ethernet hard_header_len */
2098                                         + IEEE80211_ENCRYPT_HEADROOM;
2099                 ndev->needed_tailroom = IEEE80211_ENCRYPT_TAILROOM;
2100
2101                 ret = dev_alloc_name(ndev, ndev->name);
2102                 if (ret < 0) {
2103                         ieee80211_if_free(ndev);
2104                         free_netdev(ndev);
2105                         return ret;
2106                 }
2107
2108                 ieee80211_assign_perm_addr(local, ndev->perm_addr, type);
2109                 if (is_valid_ether_addr(params->macaddr))
2110                         eth_hw_addr_set(ndev, params->macaddr);
2111                 else
2112                         eth_hw_addr_set(ndev, ndev->perm_addr);
2113                 SET_NETDEV_DEV(ndev, wiphy_dev(local->hw.wiphy));
2114
2115                 /* don't use IEEE80211_DEV_TO_SUB_IF -- it checks too much */
2116                 sdata = netdev_priv(ndev);
2117                 ndev->ieee80211_ptr = &sdata->wdev;
2118                 memcpy(sdata->vif.addr, ndev->dev_addr, ETH_ALEN);
2119                 ether_addr_copy(sdata->vif.bss_conf.addr, sdata->vif.addr);
2120                 memcpy(sdata->name, ndev->name, IFNAMSIZ);
2121
2122                 if (txq_size) {
2123                         txqi = netdev_priv(ndev) + size;
2124                         ieee80211_txq_init(sdata, NULL, txqi, 0);
2125                 }
2126
2127                 sdata->dev = ndev;
2128         }
2129
2130         /* initialise type-independent data */
2131         sdata->wdev.wiphy = local->hw.wiphy;
2132
2133         ieee80211_sdata_init(local, sdata);
2134
2135         ieee80211_init_frag_cache(&sdata->frags);
2136
2137         INIT_LIST_HEAD(&sdata->key_list);
2138
2139         INIT_DELAYED_WORK(&sdata->dec_tailroom_needed_wk,
2140                           ieee80211_delayed_tailroom_dec);
2141
2142         for (i = 0; i < NUM_NL80211_BANDS; i++) {
2143                 struct ieee80211_supported_band *sband;
2144                 sband = local->hw.wiphy->bands[i];
2145                 sdata->rc_rateidx_mask[i] =
2146                         sband ? (1 << sband->n_bitrates) - 1 : 0;
2147                 if (sband) {
2148                         __le16 cap;
2149                         u16 *vht_rate_mask;
2150
2151                         memcpy(sdata->rc_rateidx_mcs_mask[i],
2152                                sband->ht_cap.mcs.rx_mask,
2153                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
2154
2155                         cap = sband->vht_cap.vht_mcs.rx_mcs_map;
2156                         vht_rate_mask = sdata->rc_rateidx_vht_mcs_mask[i];
2157                         ieee80211_get_vht_mask_from_cap(cap, vht_rate_mask);
2158                 } else {
2159                         memset(sdata->rc_rateidx_mcs_mask[i], 0,
2160                                sizeof(sdata->rc_rateidx_mcs_mask[i]));
2161                         memset(sdata->rc_rateidx_vht_mcs_mask[i], 0,
2162                                sizeof(sdata->rc_rateidx_vht_mcs_mask[i]));
2163                 }
2164         }
2165
2166         ieee80211_set_default_queues(sdata);
2167
2168         sdata->deflink.ap_power_level = IEEE80211_UNSET_POWER_LEVEL;
2169         sdata->deflink.user_power_level = local->user_power_level;
2170
2171         /* setup type-dependent data */
2172         ieee80211_setup_sdata(sdata, type);
2173
2174         if (ndev) {
2175                 ndev->ieee80211_ptr->use_4addr = params->use_4addr;
2176                 if (type == NL80211_IFTYPE_STATION)
2177                         sdata->u.mgd.use_4addr = params->use_4addr;
2178
2179                 ndev->features |= local->hw.netdev_features;
2180                 ndev->priv_flags |= IFF_LIVE_ADDR_CHANGE;
2181                 ndev->hw_features |= ndev->features &
2182                                         MAC80211_SUPPORTED_FEATURES_TX;
2183                 sdata->vif.netdev_features = local->hw.netdev_features;
2184
2185                 netdev_set_default_ethtool_ops(ndev, &ieee80211_ethtool_ops);
2186
2187                 /* MTU range is normally 256 - 2304, where the upper limit is
2188                  * the maximum MSDU size. Monitor interfaces send and receive
2189                  * MPDU and A-MSDU frames which may be much larger so we do
2190                  * not impose an upper limit in that case.
2191                  */
2192                 ndev->min_mtu = 256;
2193                 if (type == NL80211_IFTYPE_MONITOR)
2194                         ndev->max_mtu = 0;
2195                 else
2196                         ndev->max_mtu = local->hw.max_mtu;
2197
2198                 ret = cfg80211_register_netdevice(ndev);
2199                 if (ret) {
2200                         free_netdev(ndev);
2201                         return ret;
2202                 }
2203         }
2204
2205         mutex_lock(&local->iflist_mtx);
2206         list_add_tail_rcu(&sdata->list, &local->interfaces);
2207         mutex_unlock(&local->iflist_mtx);
2208
2209         if (new_wdev)
2210                 *new_wdev = &sdata->wdev;
2211
2212         return 0;
2213 }
2214
2215 void ieee80211_if_remove(struct ieee80211_sub_if_data *sdata)
2216 {
2217         ASSERT_RTNL();
2218
2219         mutex_lock(&sdata->local->iflist_mtx);
2220         list_del_rcu(&sdata->list);
2221         mutex_unlock(&sdata->local->iflist_mtx);
2222
2223         if (sdata->vif.txq)
2224                 ieee80211_txq_purge(sdata->local, to_txq_info(sdata->vif.txq));
2225
2226         synchronize_rcu();
2227
2228         cfg80211_unregister_wdev(&sdata->wdev);
2229
2230         if (!sdata->dev) {
2231                 ieee80211_teardown_sdata(sdata);
2232                 kfree(sdata);
2233         }
2234 }
2235
2236 void ieee80211_sdata_stop(struct ieee80211_sub_if_data *sdata)
2237 {
2238         if (WARN_ON_ONCE(!test_bit(SDATA_STATE_RUNNING, &sdata->state)))
2239                 return;
2240         ieee80211_do_stop(sdata, true);
2241 }
2242
2243 void ieee80211_remove_interfaces(struct ieee80211_local *local)
2244 {
2245         struct ieee80211_sub_if_data *sdata, *tmp;
2246         LIST_HEAD(unreg_list);
2247         LIST_HEAD(wdev_list);
2248
2249         ASSERT_RTNL();
2250
2251         /* Before destroying the interfaces, make sure they're all stopped so
2252          * that the hardware is stopped. Otherwise, the driver might still be
2253          * iterating the interfaces during the shutdown, e.g. from a worker
2254          * or from RX processing or similar, and if it does so (using atomic
2255          * iteration) while we're manipulating the list, the iteration will
2256          * crash.
2257          *
2258          * After this, the hardware should be stopped and the driver should
2259          * have stopped all of its activities, so that we can do RCU-unaware
2260          * manipulations of the interface list below.
2261          */
2262         cfg80211_shutdown_all_interfaces(local->hw.wiphy);
2263
2264         WARN(local->open_count, "%s: open count remains %d\n",
2265              wiphy_name(local->hw.wiphy), local->open_count);
2266
2267         ieee80211_txq_teardown_flows(local);
2268
2269         mutex_lock(&local->iflist_mtx);
2270         list_for_each_entry_safe(sdata, tmp, &local->interfaces, list) {
2271                 list_del(&sdata->list);
2272
2273                 if (sdata->dev)
2274                         unregister_netdevice_queue(sdata->dev, &unreg_list);
2275                 else
2276                         list_add(&sdata->list, &wdev_list);
2277         }
2278         mutex_unlock(&local->iflist_mtx);
2279
2280         unregister_netdevice_many(&unreg_list);
2281
2282         wiphy_lock(local->hw.wiphy);
2283         list_for_each_entry_safe(sdata, tmp, &wdev_list, list) {
2284                 list_del(&sdata->list);
2285                 cfg80211_unregister_wdev(&sdata->wdev);
2286                 kfree(sdata);
2287         }
2288         wiphy_unlock(local->hw.wiphy);
2289 }
2290
2291 static int netdev_notify(struct notifier_block *nb,
2292                          unsigned long state, void *ptr)
2293 {
2294         struct net_device *dev = netdev_notifier_info_to_dev(ptr);
2295         struct ieee80211_sub_if_data *sdata;
2296
2297         if (state != NETDEV_CHANGENAME)
2298                 return NOTIFY_DONE;
2299
2300         if (!dev->ieee80211_ptr || !dev->ieee80211_ptr->wiphy)
2301                 return NOTIFY_DONE;
2302
2303         if (dev->ieee80211_ptr->wiphy->privid != mac80211_wiphy_privid)
2304                 return NOTIFY_DONE;
2305
2306         sdata = IEEE80211_DEV_TO_SUB_IF(dev);
2307         memcpy(sdata->name, dev->name, IFNAMSIZ);
2308         ieee80211_debugfs_rename_netdev(sdata);
2309
2310         return NOTIFY_OK;
2311 }
2312
2313 static struct notifier_block mac80211_netdev_notifier = {
2314         .notifier_call = netdev_notify,
2315 };
2316
2317 int ieee80211_iface_init(void)
2318 {
2319         return register_netdevice_notifier(&mac80211_netdev_notifier);
2320 }
2321
2322 void ieee80211_iface_exit(void)
2323 {
2324         unregister_netdevice_notifier(&mac80211_netdev_notifier);
2325 }
2326
2327 void ieee80211_vif_inc_num_mcast(struct ieee80211_sub_if_data *sdata)
2328 {
2329         if (sdata->vif.type == NL80211_IFTYPE_AP)
2330                 atomic_inc(&sdata->u.ap.num_mcast_sta);
2331         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2332                 atomic_inc(&sdata->u.vlan.num_mcast_sta);
2333 }
2334
2335 void ieee80211_vif_dec_num_mcast(struct ieee80211_sub_if_data *sdata)
2336 {
2337         if (sdata->vif.type == NL80211_IFTYPE_AP)
2338                 atomic_dec(&sdata->u.ap.num_mcast_sta);
2339         else if (sdata->vif.type == NL80211_IFTYPE_AP_VLAN)
2340                 atomic_dec(&sdata->u.vlan.num_mcast_sta);
2341 }